JP2021021483A - Branch pipe connection member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch pipe connecting member capable of suppressing a decrease in workability due to accumulation or biting of foreign matter such as earth and sand in a member which can be switched between a deformed state of bending and deformation during construction and an extended state. The purpose is to do. A branch pipe connecting member 10 has an inner surface fixing portion 20 and a branch pipe joint portion 40. The inner surface fixing portion 20 is a connecting portion 24 that rotatably connects the two curved pieces 22 curved along the inner peripheral surface 1a of the main pipe 1 and the two curved pieces 22 about the rotation axis C. It is possible to switch between the extended state and the deformed state. The rotation axis C of the connecting portion 24 is provided at a position offset from the curved piece 22 to a position deviated from the curvature center side of the curved piece 22 in the extended state. [Selection diagram] Fig. 1

Description

The present invention relates to a branch pipe connecting member.

Conventionally, a branch pipe connecting member has been used to connect a branch pipe to an existing main of a sewer or the like (for example, Patent Document 1).

The branch pipe connecting member of Patent Document 1 is configured by connecting two divided pieces so as to be bendable and extendable by using a hinge shaft. Further, the branch pipe connecting member is fixed to the main pipe by inserting it into the insertion hole excavated in the main pipe in a bent state and then extending it to return to the returning state. The branch pipe connecting member fixed to the main pipe has a tubular branch pipe connecting portion extending outward through the insertion hole, and the branch pipe is connected to the branch pipe connecting portion.

Patent No. 5684062

Here, the hinge shaft of the branch pipe connecting member is provided so as to be located in a plane along the bus line direction of the mating portion (hereinafter, simply referred to as the mating portion) between the two divided pieces. That is, the hinge shaft coincides with the rotation axis of the divided piece. Therefore, in the branch pipe connecting member of Patent Document 1, a gap is not formed in the mating portion when the divided piece is brought into a deformed state by being refracted and deformed. Therefore, when the branch pipe connecting member is refracted and inserted into the insertion hole of the main pipe, if foreign matter adheres to the mating portion, the foreign matter tends to accumulate.

By the way, since the branch pipe connecting member is attached to a main pipe such as an existing sewage pipe, first, in order to attach the branch pipe connecting member to the main pipe, the main pipe is buried in the ground. Is done to dig up. Subsequently, the branch pipe connecting member is attached to the opening portion provided by excavating the main pipe. Therefore, when the branch pipe connecting member is attached to the main pipe, sediments such as earth and sand on the outer peripheral surface of the main pipe and sediments such as sewage deposited on the inner peripheral surface of the main pipe are likely to fall on the branch pipe connecting member. .. Therefore, when a member that can be switched between a state of being refracted and deformed (deformed state) and a state of being extended (extended state) during construction, such as the branch pipe connecting member of Patent Document 1, is used. Foreign matter such as earth and sand easily invades or bites into the mating part. If there is a concern that such a problem may occur, care should be taken to prevent foreign matter such as earth and sand from invading and accumulating or biting in the state where the member such as the divided piece of Patent Document 1 is in a deformed state. There is a problem that the workability is lowered by that amount.

Therefore, the present invention is a branch pipe connection capable of suppressing a decrease in workability due to accumulation or biting of foreign matter such as earth and sand in a member that can be switched between a deformed state that is bent and deformed during construction and an extended state. The purpose is to provide a member.

(1) The branch pipe connecting member of the present invention provided to solve the above-mentioned problems is used for connecting a branch pipe to the main pipe, and is used in a peripheral portion of an opening formed in the main pipe. The inner surface fixing portion has an inner surface fixing portion fixed to the inner peripheral surface of the main pipe and a branch pipe joint portion capable of connecting the branch pipe to the main pipe so as to communicate with the main pipe. A connecting portion that rotatably connects a plurality of curved pieces curved along the inner peripheral surface of the main pipe and a plurality of the curved pieces about a predetermined rotation axis extending in the bus direction of the curved piece. By rotating the plurality of curved pieces via the connecting portion, the plurality of the curved pieces are extended via the connecting portion, and the mating portions of the adjacent curved pieces are continuously extended. It is possible to switch between a state and a deformed state in which a plurality of the curved pieces are bent via the connecting portion and the mating portions of the adjacent curved pieces are discontinuous, and the rotation axis is In the extended state, the curved piece is offset to a position deviated from the center of curvature of the curved piece.

In the branch pipe connecting member of the present invention, a plurality of curved pieces forming an inner surface fixing portion fixed to the inner peripheral surface of the main pipe are connected so as to be rotatable via the connecting portion. Further, the branch pipe connecting member of the present invention can be switched between a deformed state in which a plurality of curved pieces are bent via the connecting portion and a continuous extended state in which the plurality of curved pieces are extended via the connecting portion. Has been done. Therefore, the branch pipe connecting member of the present invention can be brought into a compact state by being deformed, and can be easily introduced into the main pipe through an opening formed in the main pipe. Further, the branch pipe connecting member of the present invention can be mounted in a state in which a plurality of curved pieces are extended along the inner peripheral surface by switching to an extended state after being introduced into the main pipe.

Here, in the branch pipe connecting member of the present invention, the rotation axis at the connecting portion is at a position offset from the curved piece to a position deviated from the curvature center side of the curved piece in the extended state. Therefore, in the branch pipe connecting member of the present invention, when the mating portion between the adjacent curved pieces is discontinuous through the connecting portion in the deformed state, between the curving pieces (the mating portion of one curved piece and the mating portion of one curved piece). A gap is formed (between the mating portion of the other curved piece). As a result, even if foreign matter such as earth and sand falls between the curved pieces after the branch pipe connecting member of the present invention is introduced into the main pipe in a deformed state and before it is brought into an extended state, this foreign matter is present. Can be passed through a gap formed between the curved pieces. Therefore, according to the branch pipe connecting member of the present invention, in the inner surface fixing portion that can be switched between the deformed state and the extended state, foreign matter such as earth and sand is caught between the curved pieces (the portion forming the mating portion). It is possible to reduce the possibility and minimize the decrease in work efficiency (workability) of the work of connecting the branch pipe to the main pipe.

(2) The branch pipe connecting member of the present invention has an outer surface fixing portion that directly or indirectly contacts the outer peripheral surface of the main pipe at the peripheral portion of the opening formed in the main pipe. It is preferable that the main can be sandwiched between the outer surface fixing portion and the inner surface fixing portion.

According to such a configuration, it is possible to provide a branch pipe connecting member that can be firmly attached to the main pipe by the holding force acting between the outer surface fixing portion and the inner surface fixing portion.

(3) The branch pipe connecting member of the present invention has a tubular portion in which the branch pipe joint portion is continuous with the inner surface fixing portion and has a threaded portion formed on the outer peripheral surface, and the threaded portion. However, a male screw is formed spirally in the axial direction of the tubular portion, has a ring member that can be screwed into the male screw, and the ring member is attached to the screw portion. By screwing, the outer surface fixing portion can be arranged between the ring member and the inner surface fixing portion, and the main can be arranged between the inner surface fixing portion and the outer surface fixing portion while opening the opening. It is preferable that the main pipe can be sandwiched between the inner surface fixing portion and the outer surface fixing portion by screwing the ring member into the tubular portion protruding from the main to the outside. ..

In the branch pipe connecting member of the present invention, the tubular portion forming the branch pipe joint portion is continuous with the inner surface fixing portion, and the threaded portion is formed on the outer peripheral surface. Further, the branch pipe connecting member of the present invention includes a ring member that can be screwed into the male screw of the threaded portion. The male screw formed on the threaded portion is spirally formed in the axial direction of the tubular portion. Therefore, by screwing the ring member into the screw portion, the ring member can be advanced in the axial direction of the tubular portion. Further, while arranging the outer surface fixing portion between the ring member and the inner surface fixing portion, the inner surface fixing portion and the outer surface fixing portion are fixed by screwing the ring member into the tubular portion protruding outward from the opening of the main pipe. The main can be sandwiched between the parts. As described above, the branch pipe connecting member of the present invention is as simple as arranging an inner surface fixing portion and an outer surface fixing portion inside and outside the main pipe and screwing the ring member into the tubular portion protruding outward from the opening of the main pipe. It can be attached so that the main pipe is sandwiched between the inner surface fixing portion and the outer surface fixing portion by various operations. Therefore, according to the present invention, it is possible to provide a branch pipe connecting member having excellent workability.

Here, when performing the construction for connecting the branch pipe to the main pipe using the branch pipe connecting member of the present invention, a plurality of curved pieces forming the inner surface fixing portion are extended inside the main pipe. The work of fixing the inner surface fixing portion to the inner peripheral surface of the main pipe will be performed while maintaining the state (extended state). Further, it is difficult for the operator to support the inner surface fixing portion in the extended state inside the main pipe, and there is a problem that the workability must be deteriorated if a separate tool or the like is required. Therefore, it is desirable that the branch pipe connecting member can easily perform the work of maintaining the inner surface fixing portion in the extended state inside the main pipe when connecting the branch pipes.

(4) The branch pipe connecting member of the present invention provided based on such knowledge is a combination of a plurality of joint constituent parts in which the branch pipe joint portion is interlocked with the rotation of the curved piece and can be collectively separated. It is preferable that the joint member is provided with a holding member that holds the plurality of joint components in an aggregated state by mounting the tubular portion from the outer peripheral side in the extended state. ..

According to such a configuration, the joint constituent parts forming the branch pipe joint portion are assembled to form a tubular portion in conjunction with the extension state (extended state) of the plurality of curved pieces forming the inner surface fixing portion. To. Here, in the branch pipe connecting member of the present invention, the joint constituent portion can be collectively separated in conjunction with the rotation of the curved piece. Therefore, in the extended state, the branch pipe connecting member of the present invention is held in a state in which the joint constituent portions forming the tubular portion are assembled by mounting the holding member on the tubular portion. As described above, in the branch pipe connecting member of the present invention, the inner surface fixing portion can be fixed by performing a simple operation such as gathering the joint constituent portions to form a tubular portion and attaching the holding member to the tubular portion. Can be maintained in an elongated state. Therefore, according to the branch pipe connecting member of the present invention, it is possible to contribute to the improvement of workability of the work of connecting the branch pipe to the main pipe.

(5) In the branch pipe connecting member of the present invention, a male screw is formed on the outer peripheral surface of the joint constituent portion forming the tubular portion, and the holding member has an inner peripheral surface with respect to the male screw portion. It is preferable that the ring member has a female screw that can be screwed.

According to such a configuration, the screw fastening structure composed of the tubular portion and the holding member allows the holding member to be firmly attached to the tubular portion, and the inner surface fixing portion can be more reliably maintained in the extended state. Therefore, according to the branch pipe connecting member of the present invention, the workability of the work of connecting the branch pipe to the main pipe can be further improved.

Here, when connecting the branch pipe to the branch pipe joint portion, for example, if the branch pipe can be connected to the branch pipe joint portion via a connection adapter or the like, the branch pipe can be connected to the branch pipe joint portion at the construction site. It is thought that the labor required for handling can be minimized. Further, when the branch pipe joint portion is an aggregate of the joint constituent portions as described above, the joint constituent portion can maintain a stable assembled state when connecting the branch pipe to the branch pipe joint portion. Is preferable. Further, when the adapter as described above is provided, it is preferable that the adapter can be arranged with high positioning accuracy in order to avoid poor connection of the branch pipe to the branch pipe joint portion.

(6) The branch pipe connecting member of the present invention provided based on such knowledge has a tubular branch pipe connecting adapter continuous with the ring member, and directly or indirectly with respect to the branch pipe connecting adapter. By connecting the branch pipe to the branch pipe, it is preferable that the branch pipe can be connected so as to communicate with the branch pipe joint portion.

In the branch pipe connecting member of the present invention, a branch pipe connecting adapter for connecting the branch pipe is provided so as to be continuous with the ring member. Since the ring member is attached to the tubular portion forming the branch pipe joint portion by screwing, it can be attached to the branch pipe joint portion stably and with high positioning accuracy. Further, since the branch pipe connecting member of the present invention includes a ring member, the joint constituent portion can be stably maintained in an assembled state. Further, in the branch pipe connecting member of the present invention, the branch pipe can be directly or indirectly connected via the branch pipe connecting adapter provided so as to be continuous with the ring member. Since the branch pipe connecting member of the present invention has such a configuration, the labor required for connecting the branch pipe to the main pipe can be minimized.

(7) The branch pipe connecting member of the present invention is preferably one in which the branch pipe connecting adapter is detachable from the holding member.

According to such a configuration, the branch pipe connecting member can be shared for connecting various branch pipes, for example, by appropriately changing the branch pipe connecting adapter according to the branch pipe to be constructed.

(8) In the branch pipe connecting member of the present invention, the holding member is a ring member formed in an annular shape, the ring member has a protruding portion protruding inward in the radial direction, and the ring member has an axial direction. By inserting the branch pipe connection adapter into the opening region of the ring member from one side, the outer peripheral surface of the branch pipe connection adapter is in contact with the inner peripheral surface of the ring member with respect to the protruding portion. By connecting to the ring member in a state where the end portions of the branch pipe connection adapter are in contact with each other and inserting the branch pipe joint portion into the opening region of the ring member from the other side in the axial direction of the ring member. The ring member is connected to the ring member in a state where the outer peripheral surface of the branch pipe joint portion is in contact with the inner peripheral surface of the ring member and the end portion of the branch pipe joint portion is in contact with the protruding portion. It is preferable that the branch pipe connection adapter and the branch pipe joint portion are in communication with each other.

The branch pipe connecting member of the present invention can be in a state of communicating with each other by connecting the branch pipe connecting adapter and the branch pipe joint portion via a ring-shaped member. Further, in the branch pipe connecting member of the present invention, the ring member forming the holding member has a protruding portion. Therefore, the branch pipe connection adapter and the branch pipe joint portion can be inserted from one side and the other side of the ring member to positions where they come into contact with the protruding portion, respectively. Therefore, according to the branch pipe connecting member of the present invention, it is possible to prevent a connection failure from occurring due to excessive insertion of the branch pipe connecting adapter and the branch pipe joint portion into the ring-shaped member.

Here, when the work of connecting the branch pipe to the main pipe is performed using the branch pipe connecting member described above, the inner surface fixing portion is first bent (bent state) and then perforated in the main pipe. After introducing the inside of the main pipe through the opening, the work of extending the inner surface fixing portion inside the main pipe is performed. Therefore, the branch pipe connecting member described above can be easily worked to extend the inner surface fixing portion inside the main pipe, so that the workability is further improved.

(9) Based on such findings, the branch pipe connecting member of the present invention includes an urging member that exerts an urging force on a plurality of the curved pieces in the extending state in the deformed state. It should be a thing.

According to this configuration, the inner surface fixing portion is brought into a bent state by applying a force to the inner surface fixing portion against the urging force of the urging member, and the inner surface fixing portion is released by releasing the force against the urging force of the urging member. It can be in an extended state. Therefore, according to the above-described configuration, after the inner surface fixing portion is introduced into the main pipe through the opening drilled in the main pipe in a bent state, the force acting on the inner surface fixing portion is released to fix the inner surface. The part tries to be restored to the extended state by the urging force of the urging member. Therefore, according to the above-described configuration, the work of extending the inner surface fixing portion inside the main pipe can be easily performed, and the work of connecting the branch pipe to the main pipe by using the branch pipe connecting member can be performed. Workability can be greatly improved.

Here, as described above, in the branch pipe connecting member of the present invention, as a deformed state, when the mating portion of adjacent curved pieces via the connecting portion is made discontinuous, between the curved pieces (one of them). A gap is formed between the mating portion of the curved piece and the mating portion of the other curved piece). When the urging member is provided as described above, if the urging member is caught in the gap between the curved pieces, it may hinder the inner surface fixing portion from being extended. Further, when the size of the gap formed between the curved pieces in the deformed state is compared between the curvature center side (inner circumference side) and the opposite side (outer circumference side), the curvature center side (inner circumference side) Is small. Therefore, when the urging member is provided as described above, it is considered that the urging member is less likely to get caught in the gap between the curved pieces if the urging member is provided on the center of curvature side (inner peripheral side). Be done.

(10) Based on such findings, in the branch pipe connecting member of the present invention, the urging member exhibits the urging force at least in the bent state, and the urging member is a plurality of the curved pieces. It is preferable that the surface is provided on the surface on the center side of the curvature.

According to such a configuration, the inner surface fixing portion can be smoothly switched to the extended state by releasing the force applied to bring the inner surface fixing portion into the bent state. Further, according to the above-described configuration, a large gap is secured between the curved pieces constituting the inner surface fixing portion in the state where the inner surface fixing portion is in the bent state. As a result, the possibility that the urging member gets caught in the gap between the curved pieces can be suppressed.

(11) In the branch pipe connecting member of the present invention, the urging member constitutes the connecting portion and is provided so as to straddle the plurality of the curved pieces, and the curved piece is provided with respect to the curved piece. It is preferable that the shaft can be bent so as to form the center of rotation at a position offset to a position offset from the center of curvature.

According to such a configuration, the urging member can also function as a connecting portion. Therefore, according to the above-described configuration, the branch pipe connecting member can be made even simpler.

According to the present invention, it is possible to suppress foreign matter such as earth and sand from getting caught between curved pieces (parts forming a mating portion) in a deformed state, and to easily connect a branch pipe to the main pipe. A branch pipe connecting member can be provided.

It is a perspective view which shows the state which attached the branch pipe connecting member which concerns on one Embodiment of this invention to a main pipe. FIG. 5 is a cross-sectional view showing a state in which the branch pipe connecting member shown in FIG. 1 is cross-sectionally viewed in a plane extending in the radial direction of the main pipe. FIG. 3 is a cross-sectional view showing a state in which the branch pipe connecting member shown in FIG. 1 is cross-sectionally viewed in a plane extending in the axial direction of the main pipe. It is a top view of the branch pipe connecting member shown in FIG. It is a perspective view which shows the mode which integrated the inner surface fixing part and the branch pipe joint part used for the branch pipe connecting member shown in FIG. 1 in the extended state. It is a top view which shows the mode which integrated the inner surface fixing part and the branch pipe joint part used for the branch pipe connecting member shown in FIG. 1 in the extended state. It is a perspective view which shows the mode which integrated the inner surface fixing part and the branch pipe joint part used for the branch pipe connecting member shown in FIG. 1 in a deformed state. It is a top view which shows the mode which integrated the inner surface fixing part and the branch pipe joint part used for the branch pipe connecting member shown in FIG. 1 in a deformed state. FIG. 7 is an enlarged perspective view of the vicinity of the connecting portion (X portion) in FIG. 7. (A) is a cross-sectional view showing the first construction stage of mounting the branch pipe connecting member shown in FIG. 1 to the main pipe, and (b) is a cross-sectional view showing the second construction stage. FIG. 1A is a cross-sectional view showing a third construction stage of attachment of the branch pipe connecting member shown in FIG. 1 to the main pipe, and FIG. 1B is a cross-sectional view showing a fourth construction stage. It is a bottom view which shows the state which the inner surface fixing part which concerns on a modification is extended, and is seen from the bottom side. It is a perspective view which shows the mode which integrated the inner surface fixing part and the branch pipe joint part which concerns on a modification, and is in a deformed state. It is a top view which shows the mode which made the thing which integrated the inner surface fixing part and the branch pipe joint part which concerns on a modification | deformation state.

Hereinafter, the branch pipe connecting member 10 according to the embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the expressions such as up / down / left / right, front / back, front / back, etc. are based on the state in which the branch pipe connecting member 10 is attached to the main pipe 1 as shown in FIG. 1 unless otherwise specified. It is explained as. Further, in the following description, first, the configuration of the branch pipe connecting member 10 will be described, and then a construction method of connecting the branch pipe 5 to the main pipe 1 by using the branch pipe connecting member 10 will be described.

<< About the configuration of the branch pipe connecting member 10 >>
As shown in FIGS. 1 to 4, the branch pipe connecting member 10 is used to connect the branch pipe 5 to the opening 3 newly formed by perforating an existing main pipe 1 such as a sewer pipe. Is something that can be done. The main pipe 1 can be, for example, a concrete pipe, a hume pipe, a resin pipe made of a resin such as vinyl chloride, or the like. As shown in FIGS. 2 and 3, the branch pipe connecting member 10 includes an inner surface fixing portion 20, a branch pipe joint portion 40, an outer surface fixing portion 60, a ring member 80 (holding member), and a branch pipe connecting adapter 100. ..

The inner surface fixing portion 20 is a portion fixed to the inner peripheral surface 1a of the main pipe 1 in the peripheral portion of the opening 3 formed in the main pipe 1. As shown in FIGS. 5 to 8 and the like, the inner surface fixing portion 20 has a plurality of (two in this embodiment) curved pieces 22 and a connecting portion 24.

As shown in FIG. 2, the curved piece 22 is a piece-shaped member curved in an arc shape along the inner peripheral surface 1a of the main pipe 1 when viewed from the side. That is, the curvature of the curved piece 22 is substantially the same as the curvature of the inner peripheral surface 1a of the main pipe 1. The curved pieces 22 are rotatably connected to each other in a state of being arranged in parallel via a connecting portion 24 described in detail later.

As shown in FIG. 5, the inner surface fixing portion 20 is rotated so that the back surfaces of the adjacent curved pieces 22 and 22 are separated from each other, so that the adjacent curved pieces 22 and 22 are butted against each other and the front surfaces are continuous. Become in a state. As a result, the inner surface fixing portion 20 is in an extended state (extended state) as a whole. Further, in the extended state, the inner surface fixing portion 20 has a substantially saddle-shaped appearance shape. As described above, the curved piece 22 has a portion (matching portion 22a) that is abutted with another adjacent curved piece 22 in the extended state.

Further, as shown in FIGS. 7 and 8, the inner surface fixing portion 20 is folded so that the back surfaces of the adjacent curved pieces 22 and 22 are close to each other at the connecting portion 24, whereby the adjacent curved pieces 22 and 22 are folded. A discontinuous portion is formed between the surfaces, and a bent state (deformed state) can be obtained. That is, when the inner surface fixing portion 20 is in a deformed state, the mating portions 22a and 22a of the adjacent curved pieces 22 and 22 are separated from each other, and a gap 25 is formed between the two.

The connecting portion 24 rotatably connects a plurality of (two in the present embodiment) curved pieces 22 around a predetermined rotation axis C extending in the generatrix direction of the curved piece 22. The rotation axis C exists at a position on the side of the mating portion 22a forming the boundary between the curved pieces 22 and 22 arranged side by side. Further, the rotation axis C is at a position offset to the curved pieces 22 and 22 at positions deviated from the center of curvature side in the state where the inner surface fixing portion 20 is in the extended state.

As shown in FIGS. 7 to 9, a connecting shaft portion 26a and a connecting receiving portion 26b are formed on the curved piece 22 so that the rotation axis C of the connecting portion 24 is arranged at the position as described above. There is. The connecting shaft portion 26a and the connecting receiving portion 26b are provided on one end side and the other end side of the rotation axis C in the axial direction at the end face side portions forming the mating portion 22a in the curved piece 22, respectively.

The connecting shaft portion 26a has a protruding portion 26c and a shaft portion 26d. The protruding portion 26c is a piece-shaped portion that protrudes toward the back surface side of the curved piece 22 and extends in a direction intersecting (substantially orthogonal to) the axial direction of the rotation axis C. The shaft portion 26d is a shaft-shaped portion formed on the back side of the curved piece 22 so as to protrude from the protruding portion 26c toward one side and the other side in the axial direction of the rotation axis C. In the connecting shaft portion 26a, a notch 26e is formed in a portion where the shaft portion 26d protrudes on both sides of the protruding portion 26c to allow the connecting receiving portion 26b that engages with the shaft portion 26d to escape.

The connecting receiving portion 26b is a portion that receives the connecting shaft portion 26a. The connecting receiving portion 26b has a protruding portion 26c protruding toward the back surface side of the curved piece 22. The connecting receiving portion 26b is capable of inserting and engaging the shaft portion 26d of the connecting shaft portion 26a.

Specifically, the connecting receiving portion 26b can rotatably hold the shaft portion 26d by inserting the shaft portion 26d. The connecting receiving portion 26b corresponds to the shaft portion 26d of the connecting shaft portion 26a described above, and is provided so as to be engaged with the shaft portion 26d on both sides of the protruding portion 26c. The connecting receiving portion 26b is formed in a substantially "C" shape, and the open portion provided in a part of the peripheral portion is made smaller than the diameter of the shaft portion 26d. The connecting receiving portion 26b is formed of a flexible resin or the like like the curved piece 22. Therefore, when inserting the connecting shaft portion 26a into the connecting receiving portion 26b, if the connecting shaft portion 26a is strongly pushed in the open portion provided on the peripheral portion of the connecting receiving portion 26b, the connecting receiving portion 26b can be pushed in strongly. Can be temporarily bent so that the connecting receiving portion 26b holds the connecting shaft portion 26a.

Here, in the present embodiment, the two curved pieces 22 and 22 are made of the same member, and one curved piece 22 is a branch pipe joint portion 40 described in detail later with respect to the other curved piece 22. It is arranged in a state of being inverted 180 degrees about the axis of the tubular portion 44. Therefore, of the two curved pieces 22 and 22 arranged in parallel, the connecting receiving portion 26b formed on the other curved piece 22 is located at a position corresponding to the connecting shaft portion 26a formed on the one curved piece 22. Coming. Therefore, as described above, the connecting portion 24 is formed by engaging and connecting the connecting shaft portion 26a and the connecting receiving portion 26b, and the two curved pieces 22 and 22 are rotatably connected. ..

The branch pipe joint portion 40 is a portion that functions as a joint for connecting the branch pipe 5 to the main pipe 1 so as to communicate with the main pipe 1. As shown in FIGS. 5 to 8, the branch pipe joint portion 40 is a joint component portion 42 of a plurality of (two in the present embodiment) that can be collectively separated in conjunction with the rotation of the curved pieces 22 and 22. It is composed of combinations. The branch pipe joint portion 40 has a tubular portion 44 formed by assembling the joint constituent portions 42 and 42 in a state where the inner surface fixing portion 20 is in the extended state, and a screw portion 46.

Specifically, as shown in FIGS. 5 and 7, the joint component 42 has a semi-cylindrical shape. That is, the joint constituent portion 42 has a peripheral portion 42a having a semicircular cross-sectional shape, and communicates from one end side in the axial direction to the other end side while excluding the peripheral portion 42a (peripheral portion open portion 42b). ) Is open in the circumferential direction. Peripheral end faces 42c and 42c extending in the vertical direction are provided at the end portions on one side and the other side in the circumferential direction of the peripheral portion 42a.

The joint constituents 42 and 42 are integrally provided with respect to the curved pieces 22 and 22, respectively. The joint constituents 42, 42 project upward from the surface side of the curved pieces 22, 22. The joint constituent portions 42 and 42 are provided at substantially the center of the curved pieces 22 and 22 in the longitudinal direction (generatrix direction), respectively. In the curved pieces 22 and 22, the portion on the base end (lower end) side of the joint constituent portions 42 and 42 is cut in a semicircular shape according to the shape of the curved pieces 22 and 22. Further, the joint constituent portions 42, 42 are formed so that the peripheral end faces 42c, 42c are continuous with the end faces of the curved pieces 22, 22 on the mating portion 22a side. Therefore, when the inner surface fixing portion 20 is extended, the peripheral end faces 42c and 42c of the joint constituent portion 42 on one side are in contact with the peripheral end surfaces 42c and 42c of the joint constituent portion 42 on the other side. Therefore, the branch pipe joint portion 40 can form a tubular portion 44 composed of a combination of the joint constituent portions 42, 42 by gathering the joint constituent portions 42, 42 with the inner surface fixing portion 20 in the extended state.

Further, in the state where the tubular portion 44 is formed, the screw portion 46 is provided on the outer peripheral portion of the joint constituent portions 42, 42. The screw portion 46 is formed by forming a male screw 46a spirally in the axial direction of the tubular portion 44.

As shown in FIGS. 1 to 3, the outer surface fixing portion 60 abuts on the outer peripheral surface 1b of the main pipe 1 at the peripheral portion of the opening 3 drilled in the main pipe 1. The outer surface fixing portion 60 is a member for sandwiching the main pipe 1 together with the inner surface fixing portion 20 when the branch pipe connecting member 10 is attached to the main pipe 1. The outer surface fixing portion 60 has a substantially saddle-shaped external shape curved along the outer peripheral surface 1b of the main pipe 1. Further, an insertion hole 62 is provided in a substantially central portion of the outer surface fixing portion 60. The opening diameter of the insertion hole 62 is set to a size that allows the above-mentioned branch pipe joint portion 40 (cylindrical portion 44) to be inserted. Further, the outer surface fixing portion 60 covers a region equivalent to or more in the circumferential direction than the inner surface fixing portion 20 in the extended state when the branch pipe connecting member 10 is attached to the main pipe 1. It is said to be the size that covers 1.

The ring member 80 is a ring-shaped member that can be screwed into the threaded portion 46 (male screw 46a) formed on the outer periphery of the tubular portion 44 forming the branch pipe joint portion 40 described above. Specifically, the ring member 80 is opened in a substantially circular shape at both ends in the axial direction (both ends in the vertical direction), and a female screw 82 is provided on the inner peripheral portion so as to correspond to the male screw 46a forming the screw portion 46. It was formed. The female screw 82 is formed from an end portion on one side in the axial direction of the ring member 80 (hereinafter, also referred to as “screw side end portion 80a”) to an intermediate portion in the axial direction.

Further, a protruding portion 84 is provided on the inner peripheral portion of the ring member 80. The protruding portion 84 is provided at an axial intermediate portion of the ring member 80. Specifically, the protruding portion 84 is provided at a position deviated from the portion where the female screw 82 described above is formed in the axial direction of the ring member 80. In the ring member 80, the portion extending from the portion where the protruding portion 84 is formed to the end portion on the opposite side to the screw side end portion 80a (hereinafter, also referred to as “reception side end portion 80b”) is the inner circumference. The female screw 82 is not formed on the portion. Further, the projecting portion 84 projects inward in the radial direction of the ring member 80 in all or part of the circumferential direction of the ring member 80. The amount of protrusion of the protruding portion 84 can be, for example, about the same as the unevenness forming the female screw 82 as in the present embodiment.

As shown in FIGS. 1 to 3 and 11 (a), a tubular portion having a ring member 80 forming a branch pipe joint portion 40 with the screw side end portion 80a at the head (in a state of facing downward in the illustrated state). By externally fitting the 44 and screwing the male screw 46a and the female screw 82, the semi-cylindrical joint constituent portions 42 and 42 forming the branch pipe joint portion 40 can be held so as not to separate from each other. As a result, the curved pieces 22 and 22 provided so as to be continuous with the joint constituent portions 42 and 42 are also abutted at the mating portions 22a and 22a, and the inner surface fixing portion 20 is maintained in an extended state (extended state) as a whole. To. Therefore, by mounting the ring member 80 on the tubular portion 44, it is possible to exert a function as a holding member for holding the tubular portion 44 in a tubular shape and a function for maintaining the inner surface fixing portion 20 in an extended state. ..

Further, while inserting the tubular portion 44 of the branch pipe joint portion 40 integrated into the inner surface fixing portion 20 from the back side of the outer surface fixing portion 60 into the insertion hole 62 of the outer surface fixing portion 60, the surface of the outer surface fixing portion 60 On the side, the ring member 80 is attached to the tubular portion 44, and the male screw 46a and the female screw 82 are screwed to move the ring member 80 in the axial direction of the tubular portion 44, thereby causing the end of the ring member 80. The outer surface fixing portion 60 can be pushed and moved in a direction close to the inner surface fixing portion 20 by the portion. Therefore, with the main pipe 1 sandwiched between the inner surface fixing portion 20 and the outer surface fixing portion 60, the ring member 80 is attached to the tubular portion 44, and the ring member 80 is rotated along the male screw 46a and the female screw 82. Then, a holding force can be applied to the main pipe 1 arranged between the inner surface fixing portion 20 and the outer surface fixing portion 60.

The branch pipe connection adapter 100 is a portion that allows the branch pipe 5 to be directly or indirectly connected so as to communicate with the branch pipe joint portion 40. In the present embodiment, as shown in FIGS. 1 to 3, the branch pipe 5 communicates with the branch pipe joint portion 40 via the receiving member 102 connected to the end portion of the branch pipe 5. It is said that it can be connected.

The branch pipe connection adapter 100 is a tubular one provided so as to be continuous with the ring member 80. The branch pipe connection adapter 100 may be integrally formed with the ring member 80, but in the present embodiment, the branch pipe connection adapter 100 is a member separate from the ring member 80 and is removable from the ring member 80. ing.

The branch pipe connection adapter 100 has an insertion portion 104 to be inserted into the receiving side end portion 80b side of the ring member 80 described above on one end side (lower end side in the illustrated state) in the axial direction. The wall thickness of the insertion portion 104 is such that when the ring member 80 is attached to the tubular portion 44, the inner circumference of the ring member 80 is set at a portion on the receiving side end portion 80b side of the protruding portion 84 of the ring member 80. The size of the gap formed between the surface and the outer peripheral surface of the tubular portion 44 is substantially the same. Therefore, when the insertion portion 104 is inserted from the receiving side end portion 80b side of the ring member 80, the insertion portion 104 is in a state of being substantially in close contact with the inner peripheral surface of the ring member 80 and the outer peripheral surface of the tubular portion 44. ..

Further, the branch pipe connection adapter 100 has a step portion 106 in the intermediate portion in the axial direction. In the branch pipe connection adapter 100, a portion opposite to the insertion portion 104 (the portion on the upper side in the illustrated state) via the step portion 106 is a socket connection portion 108 for connecting the socket member 102. ing. In the branch pipe connection adapter 100, a step is formed on the inner peripheral surface and the outer peripheral surface of the step portion 106. The receiving port connecting portion 108 has a larger diameter than the insertion portion 104. Further, a flange portion 110 projecting outward in the radial direction is provided in the middle portion of the socket connecting portion 108.

The receiving port member 102 has a groove 112 into which the receiving port connecting portion 108 can be inserted into the end portion (adapter connecting end 102a) on the side connected to the branch pipe connecting adapter 100. The receiving member 102 inserts the receiving connection 108 into the groove 112 until the adapter connecting end 102a is in contact with the flange 110 or the step 106, and the belt 114 is attached to the outer peripheral side of the adapter connecting end 102a. By doing so, it is connected to the branch pipe connection adapter 100. When the receiving member 102 is connected to the branch pipe connecting adapter 100, the inner peripheral surface of the receiving member 102 is substantially continuous with the inner peripheral surface of the insertion portion 104 of the branch pipe connecting adapter 100. Further, the receiving member 102 is capable of inserting the branch pipe 5 into the end portion (branch pipe connecting end 102b) on the side opposite to the adapter connecting end 102a in the axial direction. By inserting and connecting the branch pipe 5 to the branch pipe connecting end 102b, the branch pipe 5 can communicate with the branch pipe joint portion 40.

<< About the construction method using the branch pipe connecting member 10 >>
Subsequently, a construction method for connecting the branch pipe 5 to the opening 3 drilled in the main pipe 1 by using the branch pipe connecting member 10 will be described.

When connecting the branch pipe 5 to the main pipe 1, the branch pipe connecting member 10 is attached to a member in which the inner surface fixing portion 20 and the branch pipe joint portion 40 are integrated, the outer surface fixing portion 60, the ring member 80, and the branch pipe connecting adapter 100. Prepared in a disassembled state. After that, as shown in FIGS. 7 and 8, the curved pieces 22 and 22 forming the inner surface fixing portion 20 are rotated at the connecting portion 24 to be in a deformed state, so that the inner surface fixing portion 20 is compactly folded. To do. In this state, the inner surface fixing portion 20 is introduced from the opening 3 of the main pipe 1. After that, the curved pieces 22 and 22 forming the inner surface fixing portion 20 are rotated at the connecting portion 24 to bring them into an extended state. The work of extending the inner surface fixing portion 20 includes, for example, having a pair of joint forming portions 42, 42 protruding from the opening 3 to the outside of the main pipe 1 and bringing them close to each other to form a tubular portion 44. Can be done in a way. Since the joint components 42 and 42 are integrated with the curved pieces 22 and 22, the curved pieces 22 and 22 can be switched to the extended state by performing the operation of bringing the joint components 42 and 42 close to each other as described above. Can be done.

When the above-mentioned work is performed, as shown in FIG. 10A, the curved pieces 22 and 22 are in an extended state in the main pipe 1, and the tubular portion 44 formed by the joint constituent portions 42 and 42 is formed. Is in a state of protruding from the opening 3 to the outside of the main pipe 1. In this state, as shown in FIG. 10B, the outer surface fixing portion 60 is placed on the outer peripheral surface of the main pipe 1 in the vicinity of the opening 3, and the tubular portion 44 is inserted into the insertion hole 62 provided in the outer surface fixing portion 60. Is inserted. After that, as shown in FIG. 11A, the ring member 80 is attached to the tubular portion 44. At this time, the ring member 80 is in a state in which the screw side end portion 80a is directed toward the head side (lower side in the illustrated state). By screwing the female screw 82 of the ring member 80 with the male screw 46a provided on the screw portion 46 of the tubular portion 44, the ring member 80 advances to the outer surface fixing portion 60 side, and eventually the outer surface is fixed from the ring member 80. A pressing force acts on the portion 60 in the direction toward the outer peripheral surface of the main pipe 1. Further, a pressing force acts from the inner surface fixing portion 20 integrated with the branch pipe joint portion 40 in the direction toward the inner peripheral surface of the main pipe 1. Therefore, when the ring member 80 is tightened, a holding force acts on the main pipe 1 from the inner surface fixing portion 20 and the outer surface fixing portion 60. As a result, the inner surface fixing portion 20 and the outer surface fixing portion 60 are firmly fixed to the main pipe 1.

When the inner surface fixing portion 20 and the outer surface fixing portion 60 are fixed to the main pipe 1 as described above, the branch pipe connecting adapter 100 is connected to the ring member 80 as shown in FIG. 11 (b). To. Specifically, the branch pipe connection adapter 100 is connected by inserting the insertion portion 104 provided on one end side into the receiving side end portion 80b of the ring member 80.

Further, the branch pipe 5 is connected to the branch pipe connection adapter 100 via the receiving member 102. Specifically, the receiving connection portion 108 of the branch pipe connecting adapter 100 is inserted into the groove 112 provided in the adapter connecting end 102a of the receiving member 102, and the belt 114 is attached to the outer circumference of the adapter connecting end 102a. , The receiving member 102 is connected to the branch pipe connecting adapter 100. Further, the branch pipe 5 is inserted and connected to the branch pipe connecting end 102b of the receiving member 102. As a result, as shown in FIGS. 1 to 3, the branch pipe 5 and the branch pipe joint portion 40 communicate with each other, and the branch pipe 5 is connected to the main pipe 1.

As described above, in the branch pipe connecting member 10 of the present embodiment, a plurality of (two in the present embodiment) curved pieces of the inner surface fixing portions 20 for fixing to the inner peripheral surface 1a of the main pipe 1 are provided. It is assumed that 22 is connected so as to be rotatable by the connecting portion 24. Further, the branch pipe connecting member 10 is capable of switching the inner surface fixing portion 20 between a deformed state and an extended state. The branch pipe connecting member 10 is in a compactly folded state by being deformed, and can be easily introduced into the main pipe 1 through the opening 3 formed in the main pipe 1. Therefore, the branch pipe connecting member 10 can easily perform the work of introducing the inner surface fixing portion 20 into the main pipe 1. Further, the branch pipe connecting member 10 is brought into a state in which a plurality of curved pieces 22 are extended along the inner peripheral surface 1a of the main pipe 1 by switching to an extended state after being introduced into the main pipe 1. The vicinity of the opening 3 of the pipe 1 can be reinforced from the inner peripheral surface 1a side.

Further, in the branch pipe connecting member 10 of the present embodiment, the rotation axis C in the connecting portion 24 is at a position offset from the curved piece 22 to a position deviated from the curvature center side of the curved piece 22 in the extended state. .. Therefore, when the branch pipe connecting member 10 is in the deformed state, the mating portion 22a of the adjacent curved pieces 22 is in a discontinuous state via the connecting portion 24, and a gap is formed between the curved pieces 22. To. Since such a gap is formed, the branch pipe connecting member 10 is placed between the curved pieces 22 between the curved pieces 22 after the inner surface fixing portion 20 is introduced into the main pipe 1 in the deformed state and before it is brought into the extended state. Even if foreign matter such as earth and sand falls on it, the foreign matter can pass through the gap formed between the curved pieces 22 (between the mating portions 22a). Therefore, in the branch pipe connecting member 10, it is possible to suppress the accumulation of foreign matter such as earth and sand between the curved pieces 22 (the portion forming the mating portion 22a) in the deformed state, and to easily perform the work of deforming from the deformed state to the extended state. And it becomes possible to perform smoothly.

In the present embodiment, an example in which the inner surface fixing portion 20 is composed of two curved pieces 22 is shown, but a larger number of curved pieces 22 and members other than the curved pieces 22 are attached to the inner surface fixing portion 20. It may be provided.

Further, in the branch pipe connecting member 10 of the present embodiment, the mating portions 22a and 22a of the curved pieces 22 and 22 are respectively formed by the end faces of the curved pieces 22. Therefore, when the inner surface fixing portion 20 is in the extended state, the surfaces of the curved pieces 22 and 22 are substantially flush with each other without forming a large step at the boundary portion of the curved pieces 22 and 22. Therefore, the branch pipe connecting member 10 can mount the inner surface fixing portion 20 substantially evenly on the inner peripheral surface 1a of the main pipe 1 regardless of the portion.

Although the present embodiment shows an example in which the mating portion 22a of the curved piece 22 is formed by the end face of the curved piece 22, the mating portion 22a may be formed by a portion other than the end face of the curved piece 22. Specifically, at the end of one of the curved pieces 22 and 22 arranged in parallel, and at the end of the other curved piece 22, as in what is called "combination" or the like. It may be configured to provide a covering portion (combination portion). With such a configuration, it is possible to protect even a very small gap formed between the curved pieces 22 and 22 when the inner surface fixing portion 20 is in the extended state so that earth and sand or the like do not invade by the mating portion. ..

Further, the branch pipe connecting member 10 of the present embodiment has an outer surface fixing portion 60, and the main pipe 1 can be sandwiched between the outer surface fixing portion 60 and the inner surface fixing portion 20. Therefore, the branch pipe connecting member 10 can be firmly attached to the main pipe 1 by the holding force acting between the outer surface fixing portion 60 and the inner surface fixing portion 20.

In the present embodiment, an example in which the outer surface fixing portion 60 is provided is shown, but the present invention is not limited to this. Specifically, the branch pipe connecting member 10 is not provided with the outer surface fixing portion 60, but is provided with the inner surface fixing portion 20 fixed to the inner peripheral surface 1a of the main pipe 1 and the branch pipe joint portion 40. The branch pipe 5 may be directly or indirectly connectable to the pipe joint portion 40.

In the branch pipe connecting member 10 of the present embodiment, a male screw 46a is provided on a tubular portion 44 forming the branch pipe joint portion 40, and a ring member 80 having a female screw 82 screwable to the male screw 46a is provided as a cylinder. It can be attached to the shape portion 44. Further, since the male screw 46a is formed in the axial direction of the tubular portion 44, the ring member 80 is advanced in the axial direction of the tubular portion 44 by rotating the ring member 80, and the end portion of the ring member 80 is formed. The distance between the screw and the inner surface fixing portion 20 can be adjusted. Further, the branch pipe connecting member 10 is capable of screwing the ring member 80 into the tubular portion 44 in a state where the outer surface fixing portion 60 is arranged between the ring member 80 and the inner surface fixing portion 20. Therefore, in the branch pipe connecting member 10, the inner surface fixing portion 20 and the outer surface fixing portion 60 are arranged inside and outside the main pipe 1, and the ring member 80 is screwed into the tubular portion 44 protruding outward from the opening 3 of the main pipe 1. By a simple operation such as this, the main pipe 1 can be attached so as to be sandwiched between the inner surface fixing portion 20 and the outer surface fixing portion 60. Therefore, the branch pipe connecting member 10 can be easily attached to the main pipe 1.

In the present embodiment, the branch pipe connecting member 10 includes the ring member 80, but the present invention is not limited to this. For example, instead of providing the ring member 80, a female screw is attached to the end of the branch pipe 5 to be connected or another member (for example, the receiving member 102) interposed between the branch pipe 5 and the branch pipe connecting member 10. It is preferable to provide a member corresponding to the 82 and to attach the member provided with the female screw 82 to the tubular portion 44 instead of the ring member 80.

Further, in the branch pipe connecting member 10 of the present embodiment, a plurality of (two in the present embodiment) joint constituent portions 42 constituting the tubular portion 44 in the branch pipe joint portion 40 are interlocked with the rotation of the curved piece 22. It is said that the set can be separated. Specifically, by integrally forming each joint component 42 with respect to each curved piece 22, the joint component 42 can operate in conjunction with the curved piece 22. Further, the branch pipe connecting member 10 is configured such that the joint forming portion 42 is combined to form the tubular portion 44 in the state where the inner surface fixing portion 20 is in the extended state. Further, the branch pipe connecting member 10 holds the tubular portion 44 in a tubular shape by performing a simple operation such as attaching the ring member 80 to the tubular portion 44 in a state where the tubular portion 44 is formed. At the same time, the inner surface fixing portion 20 can be maintained in an extended state. Therefore, the branch pipe connecting member 10 can easily attach the inner surface fixing portion 20 to the main pipe 1.

In the present embodiment, an example in which the ring member 80 is used as a member for maintaining the shape of the tubular portion 44 and maintaining the inner surface fixing portion 20 in the extended state is shown, but the same function can be obtained. Therefore, another member may be adopted in place of the ring member 80 or in addition to the ring member 80. Specifically, the branch pipe connecting member 10 may be attached to the outer periphery of the tubular portion 44 in place of the ring member 80, or in addition to the ring member 80, the same as the belt 114.

As described above, in the branch pipe connecting member 10, the ring member 80 is screwed to the tubular portion 44 forming the branch pipe joint portion 40 so as to be stably and accurately mounted on the branch pipe joint portion 40. Will be done. Further, in the branch pipe connecting member 10, the branch pipe connecting adapter 100 is provided so as to be continuous with the ring member 80. Therefore, the branch pipe connection adapter 100 is also attached to the branch pipe joint portion 40 with good positioning accuracy, similarly to the ring member 80. In the branch pipe connecting member 10, the branch pipe 5 can be connected to such a branch pipe connecting adapter 100 (in the present embodiment, it is indirectly connected via the receiving member 102). Therefore, according to the above-described configuration, it is possible to suppress poor connection of the branch pipe 5 to the branch pipe joint portion 40 while improving workability at the construction site.

In the present embodiment, an example is shown in which the branch pipe connection adapter 100 is provided and the branch pipe 5 can be connected to the branch pipe connection adapter 100, but the present invention is not limited to this. Specifically, the branch pipe connecting member 10 may connect the branch pipe 5 to the branch pipe joint portion 40 without going through the branch pipe connecting adapter 100, for example. Further, in the present embodiment, an example in which the branch pipe 5 is indirectly connected to the branch pipe connecting adapter 100 via the receiving member 102 is shown. For example, the branch pipe 5 is connected to the branch pipe connecting adapter 100. It may be directly connected to the other.

Further, in the branch pipe connecting member 10 of the present embodiment, the branch pipe connecting adapter 100 is detachable from the ring member 80. Therefore, for example, the branch pipe connecting member 10 is made into various branches by appropriately changing the branch pipe connecting adapter 100 according to the branch pipe 5 to be constructed and the receiving member 102 connected to the branch pipe connecting adapter 100. It can be shared for the connection of the pipe 5.

As described above, in the branch pipe connecting member 10 of the present embodiment, the protruding portion 84 is provided on the inner peripheral portion of the ring member 80. Further, by inserting the branch pipe connecting adapter 100 from one side in the axial direction of the ring member 80, the outer peripheral surface of the branch pipe connecting adapter 100 is in contact with the inner peripheral surface 1a of the ring member 80 with respect to the protruding portion 84. The ends of the branch pipe connecting adapter 100 are in contact with each other, and the ring member 80 and the branch pipe connecting member 10 of the present embodiment are connected to each other. Further, by inserting the branch pipe joint portion 40 (cylindrical portion 44) from the other side in the axial direction of the ring member 80, the outer peripheral surface of the branch pipe joint portion 40 comes into contact with the inner peripheral surface 1a of the ring member 80. At the same time, the end portion of the branch pipe joint portion 40 is in contact with the protruding portion 84, and the ring member 80 and the branch pipe joint portion 40 are connected. In this way, in the branch pipe connecting member 10, the branch pipe connecting portion 40 and the branch pipe connecting adapter 100 are inserted into the ring member 80 to a position where they abut the protruding portion 84, whereby the branch pipe connecting adapter 100 and the branch pipe are inserted. The joint portion 40 can reach an appropriate position for connection and can be connected so that the two can communicate with each other. Therefore, according to the branch pipe connecting member 10 of the present embodiment, the connection work of the branch pipe connecting adapter 100 and the branch pipe joint portion 40 can be easily and accurately performed.

In the present embodiment, by providing the ring member 80 with the projecting portion 84, the branch pipe connection adapter 100 and the branch pipe joint portion 40 can be easily and intuitively inserted into the ring member 80 to positions suitable for connection. However, the present invention is not limited to this. For example, as for the branch pipe connecting member 10, the ring member 80 does not have the protruding portion 84, or the branch pipe connecting adapter 100 and the branch pipe joint portion 40 are positioned with good positioning accuracy with respect to the ring member 80 instead of the protruding portion 84. A configuration may be provided in which a mark or the like is provided so that the insert can be inserted. Further, the protruding portion 84 is provided on the inner peripheral portion of the ring member 80 without a cut over the entire circumference, has a cut in a part in the circumferential direction, or protrudes only in a part in the circumferential direction. It can be as appropriate.

Further, in the present embodiment, one curved piece 22 is provided with a connecting shaft portion 26a on one end side in the axial direction (generatrix direction) and a connecting receiving portion 26b on the other end side. Therefore, as described above, one curved piece 22 is arranged and connected to the other curved piece 22 in a state of being inverted 180 degrees about the axial center of the tubular portion 44 of the branch pipe joint portion 40. As a result, the inner surface fixing portion 20 is formed. Therefore, according to the above-described configuration, it is not necessary to prepare two types of curved pieces 22 having different configurations as the two curved pieces 22 constituting the inner surface fixing portion 20. With such a configuration, the branch pipe connecting member 10 can minimize the manufacturing cost.

In the present embodiment, the configuration in which the two curved pieces 22 forming the inner surface fixing portion 20 are the same is illustrated by the configuration as described above, but the present invention is not limited to this. Absent. For example, one curved piece 22 constituting the inner surface fixing portion 20 is provided with a connecting shaft portion 26a and is not provided with a connecting receiving portion 26b, and the other curved piece 22 is provided with a connecting receiving portion 26b. It is assumed that the connecting shaft portion 26a is not provided, and the inner surface fixing portion 20 may be formed by connecting the two.

The branch pipe connecting member 10 is not limited to the one shown as the above-described embodiment or modification, and may have a configuration in which another configuration is added or a part of the configuration is replaced by another configuration. For example, the branch pipe connecting member 10 may be configured to include the inner surface fixing portion 120 shown in FIGS. 12 to 14 instead of the above-mentioned inner surface fixing portion 20. Hereinafter, the inner surface fixing portion 120 will be described in more detail. In the following description, the parts common to the above-described inner surface fixing portion 20 are designated by the same reference numerals, and detailed description thereof will be omitted as appropriate.

The inner surface fixing portion 120 has substantially the same configuration as the above-mentioned inner surface fixing portion 20, but is different in that the connecting portion 124 is adopted instead of the connecting portion 24. Similar to the above-described connecting portion 24, the connecting portion 124 rotatably connects a plurality of (two in the present embodiment) curved pieces 22. The connecting portion 124 does not connect the two curved pieces 22 by a hinge structure composed of the connecting shaft portion 26a and the connecting receiving portion 26b like the connecting portion 24, but has an elastic plate shape or a sheet such as rubber. It differs in that it is composed of shaped members. Specifically, the connecting portion 124 is provided so as to straddle both of the curved pieces 22 and 22 arranged side by side via the mating portions 22a and 22a forming the boundary between the curved pieces 22 and 22. The connecting portion 124 is provided at two positions on one side and the other side of the curved piece 22 in the generatrix direction via the joint forming portion 42 constituting the branch pipe joint portion 40. As a result, the connecting portion 124 is rotatably connected around a predetermined rotation axis C extending in the generatrix direction of the curved pieces 22 and 22.

The connecting portion 124 is provided on the back surface side of the inner surface fixing portion 20 (the surface opposite to the protruding direction of the joint constituent portion 42). That is, the connecting portion 124 is provided on the surface of the inner surface fixing portion 120 (curved piece 22) on the curvature center side. Similar to the above-described inner surface fixing portion 20, the rotation axis C is located at a position offset from the curved pieces 22 and 22 toward the center of curvature when the inner surface fixing portion 20 is in the extended state. is there.

As described above, the connecting portion 124 is composed of a plate-shaped or sheet-shaped member having elasticity such as rubber. Therefore, when the curved pieces 22 and 22 are rotated around the rotation axis C to be bent (deformed state), the connecting portion 124 is in the direction of being extended with respect to the curved pieces 22 and 22. Apply urging force. Therefore, the connecting portion 124 not only functions as a connecting member for connecting the curved pieces 22 and 22, but also functions as an urging member 122 that exerts an urging force on the curved pieces 22 and 22 at least in a bent state. Can be demonstrated.

When the above-mentioned inner surface fixing portion 120 is adopted for the branch pipe connecting member 10, the inner surface fixing portion 120 is bent by applying a force to the inner surface fixing portion 120 against the urging force of the connecting portion 124 (the urging member 122). By releasing the force against the urging force of the urging member 122, the inner surface fixing portion 120 can be brought into the extended state. Therefore, if the inner surface fixing portion 120 is used, the inner surface fixing portion 120 is introduced into the main pipe 1 through the opening 3 in a bent state, and then the force acting on the inner surface fixing portion 120 is released to release the inner surface fixing portion 120. The 120 is restored to the extended state by the urging force of the urging member 122. Therefore, by using the above-mentioned inner surface fixing portion 120, it becomes possible to easily perform the work of expanding the curved pieces 22 and 22 inside the main pipe 1 to bring them into an extended state.

The plate-shaped or sheet-shaped member used as the connecting portion 124 (biasing member 122) in the inner surface fixing portion 120 described above exhibits an urging force in a bent state. Therefore, by releasing the force acting to bring the curved pieces 22 and 22 into the bent state, the curved pieces 22 and 22 are smoothly extended. Further, the connecting portion 124 (the urging member 122) is provided on the back surface (the surface on the center side of the curvature) of the curved pieces 22 and 22. It has such a configuration. Therefore, as shown in FIG. 13 and the like, when the curved pieces 22 and 22 are in a bent state, a large gap is formed between the curved pieces 22 and 22. As a result, when the inner surface fixing portion 120 is introduced and arranged inside the main pipe 1, the possibility that the urging member 122 gets caught in the gap between the curved pieces 22 constituting the inner surface fixing portion 120 is suppressed. it can.

As described above, in the inner surface fixing portion 120, the urging member 122 constitutes the connecting portion 124 and is provided so as to straddle the plurality of curved pieces 22. Further, the urging member 122 is bendable so as to form a rotation axis C at a position offset from the curved piece 22 to a position offset from the curvature center side of the curved piece 22. Therefore, the functions as the urging member 122 and the connecting portion 124 can be exerted by the same member. Therefore, according to the above-described configuration, the branch pipe connecting member 10 and the inner surface fixing portion 120 constituting the branch pipe connecting member 10 can have a simple configuration.

The above-mentioned inner surface fixing portion 120 exemplifies a configuration in which a connecting portion 124 is provided instead of the connecting portion 24, but the present invention is not limited thereto. For example, the inner surface fixing portion 120 may be configured to have a connecting portion 124 in addition to the connecting portion 24. Further, for example, the inner surface fixing portion 120 has a connecting portion 124 having a function of connecting the curved pieces 22 and 22, but the function as the urging member 122 is insufficient or the connecting portion 124 does not function as the urging member 122. As the member 122, for example, a spring or the like that exerts an elastic force may be separately provided. Further, the inner surface fixing portion 120 is provided with a connecting portion 24 instead of the connecting portion 124, and as the urging member 122, a member exhibiting an elastic force such as a spring is provided instead of the above-mentioned rubber or the like. It may be configured.

The present invention is not limited to those shown as the above-described embodiments, modifications, and the like, and there may be other embodiments from the teaching and spirit within the scope of the claims. The components of the above-described embodiment may be arbitrarily selected and combined. Further, any component of the embodiment and any component described in the means for solving the invention or a component embodying any component described in the means for solving the invention are arbitrarily combined. May be configured. We also intend to acquire the rights to these in the amendment or divisional application of the present application.

The present invention can be suitably used for connecting a branch pipe to a main pipe in various pipes such as a water pipe, a sewage pipe, and a drain pipe.

1: Main pipe 1a: Inner peripheral surface 3: Opening 5: Branch pipe 10: Branch pipe connecting member 20: Inner surface fixing part 22: Curved piece 22a: Matching part 24: Connecting part 25: Gap 40: Branch pipe joint part 42: Joint component 44: Cylindrical part 46: Threaded part 46a: Male screw 60: Outer surface fixing part 80: Ring member (holding member)
82: Female screw 84: Protruding part 100: Branch pipe connection adapter 120: Inner surface fixing part 122: Biasing member 124: Connecting part C: Rotating axis

Claims (11)

A branch pipe connecting member used to connect a branch pipe to the main pipe.
In the peripheral portion of the opening drilled in the main, an inner surface fixing portion fixed to the inner peripheral surface of the main, and an inner surface fixing portion.
It has a branch pipe joint portion that can connect the branch pipe to the main pipe so as to communicate with the main pipe.
The inner surface fixing portion
A plurality of curved pieces curved along the inner peripheral surface of the main pipe,
A connecting portion for rotatably connecting a plurality of the curved pieces around a predetermined rotation axis extending in the generatrix direction of the curved piece is provided.
By rotating the plurality of curved pieces via the connecting portion,
A state in which a plurality of the curved pieces extend via the connecting portion and the mating portions of the adjacent curved pieces are continuously extended.
It is possible to switch to a deformed state in which a plurality of the curved pieces are bent via the connecting portion and the mating portions of the adjacent curved pieces are discontinuous.
A branch pipe connecting member, wherein the rotation axis is offset to a position offset from the curved piece toward the center of curvature of the curved piece in the extended state. In the peripheral portion of the opening drilled in the main pipe, there is an outer surface fixing portion that directly or indirectly contacts the outer peripheral surface of the main pipe.
The branch pipe connecting member according to claim 1, wherein the main pipe can be sandwiched between the outer surface fixing portion and the inner surface fixing portion. The branch pipe joint portion has a tubular portion having a threaded portion formed on the outer peripheral surface while being continuous with the inner surface fixing portion.
The threaded portion spirally forms a male screw in the axial direction of the tubular portion.
It has a ring member that can be screwed into the male screw.
By screwing the ring member into the screw portion, the outer surface fixing portion can be arranged between the ring member and the inner surface fixing portion.
The inner surface is formed by screwing the ring member into the tubular portion protruding from the opening to the outside of the main while arranging the main pipe between the inner surface fixing portion and the outer surface fixing portion. The branch pipe connecting member according to claim 2, wherein the main pipe can be sandwiched between the fixing portion and the outer surface fixing portion. The branch pipe joint portion is composed of a combination of a plurality of joint constituent portions that can be collectively separated in conjunction with the rotation of the curved piece.
In the extended state, a plurality of the joint components are assembled to form a tubular portion.
Claims 1 to 3 include a holding member that holds a plurality of the joint components in an assembled state by mounting the tubular portion from the outer peripheral side in the extended state. The branch pipe connecting member according to any one. A male screw is formed on the outer peripheral surface of the joint component forming the tubular portion.
The branch pipe connecting member according to claim 4, wherein the holding member is a ring member having a female screw screwable to the threaded portion on the inner peripheral surface. It has a tubular branch pipe connection adapter that is continuous with the ring member.
The claim is characterized in that, by connecting the branch pipe directly or indirectly to the branch pipe connecting adapter, the branch pipe can be connected so as to communicate with the branch pipe joint portion. 5. The branch pipe connecting member according to 5. The branch pipe connecting member according to claim 6, wherein the branch pipe connecting adapter is detachable from the holding member. The holding member is a ring member formed in an annular shape.
The ring member has a protruding portion that protrudes inward in the radial direction.
By inserting the branch pipe connection adapter into the opening region of the ring member from one side in the axial direction of the ring member, the outer peripheral surface of the branch pipe connection adapter comes into contact with the inner peripheral surface of the ring member. While being connected to the ring member in a state where the end of the branch pipe connecting adapter is in contact with the protruding portion,
By inserting the branch pipe joint portion into the opening region of the ring member from the other side in the axial direction of the ring member, the outer peripheral surface of the branch pipe joint portion comes into contact with the inner peripheral surface of the ring member. At the same time, it is characterized in that the end portion of the branch pipe joint portion is in contact with the protruding portion and is connected to the ring member, and the branch pipe connection adapter and the branch pipe joint portion are in communication with each other. The branch pipe connecting member according to claim 6 or 7. The branch pipe according to any one of claims 1 to 8, further comprising an urging member that exerts an urging force on a plurality of the curved pieces in a direction in which the curved piece is in the extended state. Connecting member. The urging member exerts the urging force at least in the bent state.
The branch pipe connecting member according to claim 9, wherein the urging member is provided on a surface of the plurality of curved pieces on the center side of the curvature. The urging member constitutes the connecting portion and is provided so as to straddle the plurality of the curved pieces, and is offset to a position offset from the curved piece toward the center of curvature of the curved piece. The branch pipe connecting member according to claim 10, wherein the branch pipe connecting member is bendable so as to form the rotation axis.

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