JP2005121178A - Flexible joint, extension band, and extension fixture, and flexible joint fitting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To seal a joint part of pipes from inside in the stable condition without hindering flow of a material inside the pipes. <P>SOLUTION: A flexible joint 10 using an expansion band, for example, is provided. The extension band 1 is provided with an annular member 2, and the annular member 2 has at least one cut part 3. Diameter of the annular member 2 is enlarged by enlarging between both ends 4A and 4B of the cut part 3. The extension band 1 is provided with a box type barrel part 5, and the barrel part 5 houses both the end parts 4A and 4B of the cut part 3. The flexible joint 1 covers the joint part of the pipes from inside the pipes, and functions as a pipe inner surface water shut-off flexible joint. The flexible joint 10 is provided with a flexible member 11 and an extension band 1 arranged inside the flexible member 11. In the flexible joint 10, diameter of the annular member 2 is enlarged by enlarging between both the ends 4A and 4B of the cut part 3, and the flexible member 11 is fixed to the inside surface of the joint part 12 by the annular member 2, of which diameter is enlarged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a flexible joint, an expansion band, an expansion jig, and a method of using them, which can block a joint portion of a pipe stably from the inside.

  The sewage and agricultural water pipes are composed of a plurality of pipes, and the plurality of pipes are joined together at a joint portion. When water leaks at a joint or the like, various methods for repairing a pipeline have been conventionally performed. Such a pipe line is buried in the ground, and it is common to dig up the soil to expose the leaked point and repair from the outer surface of the pipe with a repair material. When an operator puts a large-diameter pipe into the pipe, a rubber or other sealing material is brought into the pipe, and the water leakage portion is pressed and sealed with a presser band or a bolt to repair the pipe.

The joint used in this type of method is provided with a presser band which is provided with a restraining claw portion and a locking step which are connected and locked to each other by interposing a U-shaped auxiliary plate with a sealing material such as a rubber ring. A pipe inner surface repair joint (see, for example, Patent Document 1) characterized in that a spacer is interposed in the intermediate portion in the width direction, a concave portion in which a plurality of protrusions are provided on an elastic annular body, Some have been devised to form an enlarged portion of the inner diameter so as to minimize protrusions and irregularities in the tube (see, for example, Patent Document 2). In addition, there is an expansion band for a flexible joint used for a connecting portion between a drilling portion of a manhole and a pipe (for example, see Patent Document 3).
Japanese Patent No. 3109739 Registered Utility Model No. 3014671 JP 2003-278174 A

  In a joint like patent document 1, since a mutual claw part suppresses a mutual band, the band thickness of this part becomes large, erodes inner surface space, and inhibits a flow. In addition, since the locked state with the spacer is unstable, it is necessary to hold it with a washer, etc.In order to bring the presser band into the pipe and attach it, the diameter should be made as small as possible and expanded with an operating cylinder, etc. There is a drawback that the restraining claw and the spacer become longer and the locked state becomes more unstable. Also, if soil water enters the pipe between the presser bands from the outside of the pipe joint, soil pressure is applied between the presser bands, the seal material swells, erodes the inner surface space, and the soil water pressure is higher. There is a risk that the sealing material will continue to swell and break.

  In a joint like patent document 2, since the connection body which uses the coupling body which has a step part in a connection means, this part erodes inner surface space, and inhibits a flow. Further, when pushing the stop band with a jack, it is necessary to work with the other connecting means set, which requires skill. Similarly to the former, when an external earth water pressure is applied between the retaining bands, the inner diameter enlarged part swells and invades the inner space of the pipe, and when the earth water pressure is high, the inner diameter enlarged part continues to expand and there is a risk of breaking. There is.

  An object of the present invention is to solve the conventional problems and to block the joint portion of the pipe stably from the inside without obstructing the flow of objects in the pipe. Moreover, the subject of this invention is closing the joint part of a pipe | tube efficiently from an inner side.

  The present invention is a flexible joint fixed to an inner surface of a joint portion of a pipe, and includes a flexible member and at least one pair of expansion bands arranged inside the flexible member, The band includes an annular member and a box-shaped body frame, the annular member has at least one cutting portion, and the body frame can store both ends of the cutting portion, and the cutting The annular member is expanded in a state in which both end portions of the cutting portion are accommodated in the body frame due to the expansion between both end portions of the portion, and each expansion band attaches the flexible member to an adjacent tube of the joint portion. The present invention relates to a flexible joint that is separately crimped.

  Further, the present invention is an expansion band provided with an annular member, wherein the annular member has at least one cut portion, and the diameter of the annular member is expanded by spreading between both end portions of the cut portion. An expansion band, wherein the expansion band includes a box-shaped body frame, the body frame can accommodate both ends of the cutting portion, and a window is provided on a side surface of the body frame. In addition, when the diameter of the annular member is increased, the fixing tool inserted from the window holds an interval between both end portions of the cutting portion at a predetermined interval.

  Furthermore, the present invention provides an expansion jig for expanding the diameter of a flexible joint fixed to the inner side surface of a joint portion of a pipe, wherein the flexible joint is disposed inside the flexible member and the flexible member. At least one pair of expansion bands, each expansion band including an annular member and a box-shaped body frame, the annular member having at least one cutting portion, and the cutting portion Locking portions that engage with the expansion jig are provided at both ends of the main body, the body frame can accommodate both ends of the cutting portion, and the expansion jig is connected to the main shaft and the tip of the main shaft. At least one pair of expansion pieces and a locking claw at the tip of each expansion piece, and when the diameter of the expansion band is expanded from the inside, each locking claw is locked to each end portion of the cutting portion. Each of the locking claws by extending radially outwardly of the main shaft. An expansion jig characterized in that the annular member is expanded in a state where both ends of the cutting portion are accommodated in the body frame by expansion between both ends of the cutting portion. It is.

  Further, the present invention provides (1) preparing a flexible joint when attaching the flexible joint to the joint portion of the pipe from the inside of the pipe, wherein the flexible joint is a flexible member and the flexible member. At least one pair of expansion bands disposed on the inner side, the expansion band includes an annular member, the annular member has at least one cut portion, and the expansion band is box-shaped A step of providing a trunk frame, (2) a step of arranging the flexible member inside the tube, (3) a step of arranging the annular member inside the flexible member, and (4) inside the trunk frame. (5) inserting the other end of the cutting part into the body frame and storing both ends of the cutting part in the body frame; And (6) including a step of expanding the diameter of the annular member. That variable is intended according to the method of attaching the rattan joint.

  The present inventor has found that when the joint portion of the pipe is closed with good water tightness from the inside, the flow of objects in the pipe is hindered at the connection portion between the joint portion and the flexible joint. Also, when expanding the diameter of the reduced band inside the pipe, the band moving direction is shifted, the crimping of the flexible member is uneven and causes water leakage, or the means for fixing the expanded state is unstable, There is also a risk that the fixed state may be lost due to the collision of driftwood or rocks.

  According to the study of the present inventor, it has been found that this is due to the expansion band used to fix the flexible joint to the joint. In other words, the band for fixing the flexible joint to the joint portion is formed with a bulging portion on the inner surface of the tube from a locking claw portion, a spacer, an auxiliary plate or the like as described in Patent Document 1 or 2. It is.

  Further, according to the research of the present inventor, it has been found that the expansion and fixing means as described in Patent Document 1 or 2 are inferior in watertightness in the portion where the band is fixed in the expanded state. That is, in Patent Document 1 or 2, the ring-shaped rigid band is cut at two locations, and the cutting portion is opened and fixed with an expansion jig. However, the expansion jig works in the horizontal direction as it expands, The band end is difficult to apply compressive stress to the joint surface, and the expansion band is cut off at the end of the band, and the flexible joint adheres insufficiently to the joint surface. Nevertheless, a space is easily generated between the locking claw portions or on the radially outer side of the locking claw portions and the coupling body, and the watertightness of the portion is extremely inferior. In the joint portion between the tubes, one band is used for each of the tubes to be joined, that is, at least one pair of bands is used in the joint portion, and it is necessary to increase the diameter of each band. The position of the bulge of the band significantly impedes the flow of objects in the tube. Moreover, there is a problem that the bulging portion of the band is broken due to the flow of the object in the pipe.

  Under such knowledge, the present inventor examined various means for fixing the flexible joint to the joint portion in a high close contact state without hindering the flow of objects in the pipe. As a result, the present inventor accommodates the cut end of the expansion band in a box-shaped body frame and slides it in the body frame so that the lack of the circumferential line between these cut ends is Complemented by the outer periphery of the frame, the expansion band expands to a state close to a perfect circle, and the flexible joint can be fixed to the joint part with high adhesion, as well as the expansion band bulges into the pipe Therefore, the present inventors have found out that the flow of objects in the pipe is not obstructed and have reached the present invention.

  Reference 3 is an expansion band for fixing the flexible joint to the manhole drilling part. Since the band needs to be stored in the drilling space, the band width is reduced, and the band height is increased to obtain strength. Obstructs internal flow.

  According to the flexible joint of the present invention, the joint portion of the pipe is stably closed from the inside by the annular member of the expansion band and the box-shaped body frame without the enlarged diameter portion of the annular member protruding into the pipe. be able to. Moreover, according to the predetermined expansion band and expansion jig of the present invention, the expansion band can be expanded in a stable state without requiring a complicated structure.

An embodiment for carrying out the present invention will be described.
(1) Expansion band In this invention, an expansion band can consist of an annular member and a box-shaped trunk frame (henceforth a "box-shaped sleeve").

(1-1) Annular member An annular member has at least one cutting part. “Annular” refers to a ring-like shape as a whole, and can have a plurality of cut portions. Examples of the ring include a ring having an outer shape such as a circle, an ellipse, and a polygon, and a spiral. The annular member according to the present invention can have an outer shape suitable for bringing the flexible member of the flexible joint into close contact with the joint portion so as to match the inner peripheral shape of the joint portion of the pipe.

  Typically, the annular member has a ring shape having a cut portion, and is provided with a locking portion for expansion by an expansion jig. The locking portion is provided in the vicinity of both end portions of the cut portion of the annular member. Preferably, the locking portion has a shape that fits within the box-shaped sleeve. For example, the locking part is composed of a hole, a concave part, a groove and the like.

  The annular member can have two cut portions. In this case, the annular member can consist of two semicircular annular member pieces. An annular member having an enlarged diameter is formed by expanding between both end portions of the two cut portions.

(1-2) Box-shaped sleeve It can accommodate in the state which can slide the both ends of the cutting part of an annular member. The box-shaped sleeve allows movement of the cut end portion accompanying expansion of the annular member inside thereof, while enabling substantially uniform expansion of the expansion band in the circumferential direction on the outer periphery thereof. When the diameter of the annular member is increased by an expansion jig or the like, both ends of the cutting portion move in the box-shaped sleeve, and the space between both ends opens. Both ends of the cut portion opened by expanding the diameter of the annular member are fixed by appropriate means.

  Typically, the box-shaped sleeve only needs to have a cross-sectional shape that can accommodate both ends of the cut portion of the annular member, but it is preferable that the marginal space between the both ends be small. Preferably, when the diameter of the annular member is increased, the cut portion of the annular member is supplemented to have an outer shape that is close to a perfect circle or the like and has a substantially uniform diameter expansion state. The box-shaped sleeve can have means for fixing the annular member in an expanded state.

(1-3) Diameter expansion of the annular member The annular member can be expanded using an expansion device such as a jack or various expansion means without particular limitation. Both ends of the cut portion of the annular member opened by expansion can be fixed so as to maintain the expanded state by an appropriate means not particularly limited.

(1-4) Fixing in an expanded state An appropriate fixing means is, for example, a combination of a fixing part such as a protrusion such as a claw provided in the annular member and a locking part provided in the box-shaped sleeve. . The annular member can be fixed in an expanded state by engagement between the fixing portion and the locking portion.

  A fixing tool can be used as means for fixing the expanded diameter state. The fixture can be made of a rigid material. The shape of the fixture can be selected variously. When a fixture is used, a window can be provided in the box-shaped sleeve. When the diameter of the annular member is increased, the fixture inserted from the window can hold a gap between both ends of the cut portion of the annular member.

  The window can be provided on the inner surface or the side surface of the box-shaped sleeve. The inner or side window is suitable for filling or fixing between both ends of the cutting portion by inserting a fixture from the inside of the tube. In particular, the side window does not obstruct the expansion jig to insert the fixture, and the flow is smooth because there is no open part on the inner surface of the pipe.

  As the fixture, at least one of a stopper and a fixing pin can be used. The stopper fills the space between both end portions of the cutting portion and maintains the expanded state of the annular member. The fixing pin fixes both ends of the cutting part, and maintains the expanded diameter state of the annular member.

  The stopper can consist of stopper pieces of various widths, for example 3, 5, 10 mm width. The stopper can be used in combination with these stopper pieces. When using a fixing pin, for example, whether the fixing pin is inserted into a window on the inner surface or side surface of the box-shaped sleeve, for example, a hole, and the fixing pin is inserted into a locking hole provided in advance at both ends of the annular member. The both ends of the annular member can be positioned by the fixing pin, and the expanded state can be maintained.

(1-5) Rigid material Stainless steel, rust-proof plated steel, rust-proof resin-coated steel, hard plastic, fiber reinforced plastic, or the like is used, and can be composed of these alone or a composite material. These are desirable because they are particularly difficult to corrode.

(2) Joint part of the pipe This is the connection part between the pipes. The tube is not particularly limited, and can be made of various materials and shapes. The inner diameter is not particularly limited, but a human processing operation is possible if a person can enter it, and a mechanical processing operation may be possible even if the person does not have a size.

(3) Flexible joint It can consist of a flexible member and an expansion band. Used to close the joint part of the tube from the inside of the tube. Includes waterproof joints. The water-stoppable joint can exert a desired water-stopping property by being pressure-bonded to the joint part, and prevents water or the like from entering or leaking from the pipe joint part.

(3-1) Flexible member It is used for a normal flexible joint. Typically, it has a cylindrical shape such as a cylindrical shape. At least a pair of ring-shaped water stop protrusions can be provided on the joint part side of the tube of the flexible member so as to sandwich the joint part. The water stop protrusion is pressed against the tube wall by the extension band and exhibits a water stop effect.

  The flexible member can have a displacement absorbing portion. The displacement absorbing part absorbs the displacement between the adjacent pipes of the joint part. The displacement absorbing portion can be provided in the shape of a U shape or the like in the vicinity of the joint portion.

  The flexible member can be made of an elastic material. The elastic material is, for example, at least selected from the group consisting of styrene / butadiene rubber, ethylene / propylene / diene / terpolymer (EPDM), synthetic rubber such as chloroprene rubber, natural rubber, soft vinyl chloride resin, and thermoplastic elastomer. One type.

(3-2) Expansion band for flexible joint It can be provided with the joint part of the pipe interposed. The flexible joint can comprise at least one pair of expansion bands. Each expansion band can individually crimp the flexible member to the adjacent tube of the joint.

  When a pair of expansion bands are used with the joint portion interposed therebetween, the distance between the expansion bands is preferably reduced. If almost the entire surface of the flexible member is pressed with the joint as a boundary, the flexible member between the expansion bands swells to the inside of the pipe due to the pressure of soil water entering from the joint, and obstructs the flow of objects in the pipe. Can be prevented.

(4) Expansion jig For expanding the expansion band. A main shaft, at least one pair of extension pieces at the tip of the main shaft, and a locking claw at the tip of each extension piece are provided. When the diameter of the expansion band is increased from the inside, each locking claw engages with each locking portion at both ends of the cut portion of the annular member. The distance between the locking claws is expanded by the outward extension of the main shaft in the radial direction, and the annular member is expanded in diameter.

  The main shaft of the expansion jig can have an expansion piece and a locking claw at both ends. The main shaft may be a rotating shaft that holds the extension piece. The rotating shaft can be extended or contracted by rotation. A support that supports the rotating shaft can be used. For example, by propelling an annular member having two cut portions, that is, supporting bases disposed at both ends of a cut portion of a two-divided semicircular annular member in the tube radial direction by propulsion means such as a turnbuckle. The diameter of the annular member can be increased. A hydraulic jack or the like can be used as the propulsion means. The expansion jig can also be made of the same rigid material as described above.

(5) A method of attaching a flexible joint This is a method of attaching a flexible joint to a joint portion of a pipe from the inside of the pipe. First, a flexible joint as described above is prepared, and then the flexible joint is arranged from the inside of the pipe to the joint portion of the pipe.

  A semicircular annular member having two cut portions can be used. In this case, when the cylindrical flexible member is arranged from the inside of the joint inside the pipe and the two annular member pieces divided by the two cutting parts are arranged inside the flexible member, The box-shaped sleeve is inserted into both ends of the member piece until the end protrudes, the other annular member piece is installed so as to face the one annular member piece, and the box-shaped sleeve is attached to the other annular member piece. It is inserted so as to be slid about halfway at both ends, and thereafter, the space between the end of one annular member piece and the end of the other annular member piece facing each other is expanded and fixed with an expansion jig.

(6) Joint part structure In this structure, a flexible joint is attached to the joint part of the pipe from the inside of the pipe. It can be constructed by the above-described flexible joint mounting method. A desired water-stopping property can be exerted by pressing the flexible joint to the joint portion.

  The joint part structure includes a joint part between a pipe and a pipe and a flexible joint, the flexible joint including a flexible member and at least one pair of expansion bands, and the expansion band includes an annular member and A box-shaped body frame is provided, the annular member has at least one cutting portion, and the flexible member is disposed between the joint portion and the extension band, and the annular member is cut. The annular member is expanded in diameter by storing the both end portions of the portion into the body frame and expanding between the both end portions, and each expansion band separately attaches the flexible member to the pipe adjacent to the joint portion. It is characterized by being crimped.

With reference to the drawings, embodiments for carrying out the present invention will be described in more detail.
FIG. 1 is a cross-sectional view of an example expansion band as seen from the inner surface of the joint structure. FIG. 2 is an enlarged view of the expansion band of FIG. FIG. 3 is a cross-sectional view of an example of the displacement absorbing portion as seen from the inner surface of the joint portion structure. FIG. 4 is an enlarged view of the displacement absorbing portion of FIG. FIG. 5 is a cross-sectional view of the displacement absorbing portion of FIG. 3 that is deformed by the displacement of the joint portion. FIG. 6 is an enlarged view of the displacement absorbing portion of FIG.

  FIG. 7 is a vertical cross-sectional view of an expansion band whose diameter is expanded by an example of an expansion jig. FIG. 8A is a front view of the extension jig of FIG. 7, and FIG. 8B is a side view of the extension jig of FIG. 8A. Fig.9 (a) is a front view of one annular member piece of an example, FIG.9 (b) is a side view of the annular member piece of Fig.9 (a). Fig.10 (a) is a front view of the other annular member piece of an example, FIG.10 (b) is a side view of the annular member piece of Fig.10 (a). 11 (a) is a front view of an example box-shaped sleeve, FIG. 11 (b) is a side view of the box-shaped sleeve of FIG. 11 (a), and FIG. 11 (c) is FIG. 11 (a). 11 (d) is a front view of another example of the box-shaped sleeve, and FIG. 11 (e) is a side view of the box-shaped sleeve of FIG. 11 (d). FIG.11 (f) is sectional drawing of the box-shaped sleeve of FIG.11 (d). 12 (a) is a front view of one example of the fixture, FIG. 12 (b) is a side view of the fixture of FIG. 12 (a), and FIG. 12 (c) is the fixture of FIG. 12 (a). It is sectional drawing of a tool.

  FIG. 13 is a longitudinal sectional view of another example of an expansion band. FIG. 14A is a front view of the end portion of the annular member and the box-shaped sleeve for showing the fixed state of the expansion band of FIG. 13 in detail, and FIG. 14B is a side view of FIG. is there. FIG. 15 is a longitudinal sectional view of still another example of an expansion band. 16 (a) is a front view of the end portion of the annular member and the box-shaped sleeve for showing in detail the fixed state of the expansion band of FIG. 15, and FIG. 16 (b) is a side view of FIG. 16 (a). is there. FIG. 17 is a front view showing an example in which the extension band is fixed by a stopper of one example. 18 (a) is a front view of a box-shaped sleeve of still another example, FIG. 18 (b) is a side view of the box-shaped sleeve of FIG. 18 (a), and FIG. 18 (c) is FIG. It is sectional drawing of the box-shaped sleeve of a).

  As shown in FIGS. 1 to 11, the example expansion band 1 includes an annular member 2. The annular member 2 has at least one cutting portion 3, and the diameter of the annular member 2 is expanded by the expansion between both end portions 4 </ b> A and 4 </ b> B of the cutting portion. The expansion band 1 is provided with a box-shaped sleeve 5, and the box-shaped sleeve 5 accommodates both end portions 4A and 4B of the cutting portion. The annular member 2 is provided with locking portions 6A and 6B used when the expansion band 1 is expanded in diameter.

  The box-shaped sleeve 5 is provided with a window 7. When the diameter of the annular member 2 is increased, a fixing tool inserted from the window 7 holds a predetermined distance between both end portions 4A and 4B of the cutting portion. The fixing tool may be stoppers 8 and 9 as shown in FIGS. 1 to 12, and may be fixing pins as shown in FIGS. 13 to 16, or both of them can be used. Although FIGS. 1-14 has shown the example which provided the window 7 in the pipe | tube inside of the box-shaped sleeve 5, you may provide in the side surface of the box-shaped sleeve 5 as shown in FIG.15 and 16 as needed. .

  The extension band 1 can be used for a flexible joint as shown in FIGS. Such a flexible joint can cover the joint portion of the pipe from the inside of the pipe and function as a pipe inner surface water-stopping flexible joint.

  An example flexible joint 10 of FIGS. 1 and 2 includes a flexible member 11 and an expansion band 1 disposed inside the flexible member 11. In the flexible joint 10, the annular member 2 is expanded in diameter by the expansion between both end portions 4 </ b> A and 4 </ b> B of the cutting portion 3, and the flexible member 11 is connected to the inner surface of the joint portion 12 of the pipe by the expanded annular member 2. Fixed to.

  The flexible joint 10 includes at least one pair of expansion bands 1, and each expansion band 1 separately presses the flexible member 11 to the adjacent pipes 13 and 14 of the joint portion 12. The flexible member 11 is provided with a water stop protrusion 15 on the circumference of the inner peripheral surface of the tube wall with the joint portion 12 interposed therebetween, and is pressed to exhibit water stop.

  Another example of the flexible joint 16 shown in FIGS. 3 to 6 is provided with a displacement absorbing portion 18 in the flexible member 17, and this point is particularly different from the flexible joint 10. The displacement absorbing portion 18 absorbs the displacement when a displacement occurs in the relative position between the tubes 13 and 14. In addition, the reinforcing fiber 19 is laminated on the flexible member 17, whereby the swelling of the flexible member 17 due to the pressure of soil water from the joint portion 12 can be reduced.

  5 and 6 are cross-sectional views showing an attachment state when a step 20 is generated in the joint portion 12 of the flexible joint 16 shown in FIGS. Since the flexible member 16 is expanded and fixed by the pair of expansion bands 1 with the joint portion 12 as a boundary, the flexible joint 16 can be mounted even in the joint portion 12 having the step 20 in a state of good water stoppage. is there. In addition, after mounting without a step, even if the relative position of the tube is displaced due to ground subsidence, earthquake, etc., and a step 20 occurs in the joint part 12, the displacement is followed and the water stop function is achieved. Can be maintained.

  FIG. 7 shows a situation where the expansion band 1 of the flexible joint attached to the pipe 13 is expanded by the expansion jig 21 and the flexible member 11 is pressed against the inner surface of the pipe. The expansion band 1 is expanded by increasing the diameter of the two-divided semicircular expansion member pieces 2A and 2B of the annular member 2.

  Fig.8 (a) shows the front view of the expansion jig 21 of FIG. 7, FIG.8 (b) shows the side view. The expansion jig 21 is for expanding the diameter of the expansion band. The expansion jig 21 includes a main shaft 22, at least one pair of expansion pieces 23A and 23B at the tip of the main shaft 22, and locking claws 24A and 24B at the tips of the respective expansion pieces 23A and 23B.

  When expanding the expansion band 1 from the inside, the locking claws 24A and 24B engage with the locking portions 6A and 6B of the both ends 4A and 4B of the cutting portion, and the main shaft 22 extends outward in the radial direction. The interval between the locking claws 24A and 24B is expanded, and the annular member 2 is expanded in diameter. The extension jig 21 includes a main shaft 22 to which a pair of extension pieces 23A and 23B having three locking claws 24A and 24B at the tip are attached, and a pair of support bases 25 that support the main shaft 22 as turnbuckles 26. It is connected. The main shaft 22 is a rotating shaft.

  9 and 10 show a front view and a side view of the annular member pieces 2A and 2B, and a front view and a side view of the box-shaped sleeves 5A and 5B. The annular member pieces 2A and 2B have locking portions 6A and 6B. Is provided. FIGS. 11A to 11F show a front view, a side view, and a cross-sectional view of the pair of box-shaped sleeves 5A and 5B, which are curved in a shape along the inner surface of the tube. Windows 7A and 7B are provided in the center. FIG. 12 is a front view, a side view, and a sectional view showing details of the stopper 8. FIG. 9 shows one divided annular member piece 2A, and FIG. 10 shows the other annular member piece 2B. However, the box-shaped sleeves 5A and 5B as shown in FIG. If 8 is added, the expansion band becomes a circle.

  As shown in FIGS. 7 to 12, both end portions 4A and 4B of the annular member pieces 2A and 2B are accommodated in the left and right box-shaped sleeves 5A and 5B, and the locking portions 6A and 2B of the annular member pieces 2A and 2B are provided. The engaging claws 24A, 24B of the expansion jig 21 are inserted into 6B and the turnbuckle 26 is driven to expand the expansion pieces 23A, 23B, expand the expansion band 1, and attach the stopper 8 to the box-shaped sleeve. Inserted through the windows 7A and 7B of 5A and 5B, the expanded state is fixed.

  FIG. 13 shows a longitudinal sectional view of another example of the expansion band. The expansion band 27 is different from the expansion band 1 in that another means is used as a fixture for expanding and fixing. The expansion band 27 includes annular member pieces 28A and 28B and a box-shaped sleeve 31A. The diameter of the expansion band 27 is expanded by the expansion jig 21, and then the expanded state is fixed.

  As shown in detail in FIGS. 14 (a) and 14 (b), both end portions 30A and 30B of the cut portions of the annular member pieces 28A and 28B are provided with locking portions 32A and 32B of the extension jig 21, respectively. A window 33A is provided in the box-shaped sleeve 31A. Further, the annular member pieces 28A and 28B are provided with locking holes 34A and 34B. The expansion jig 21 is attached and expanded to the locking portions 32A and 32B, and the fixing pin 35 inserted from the window 33A of the box-shaped sleeve 31A is inserted into the locking holes 34A and 34B. 28A and 28B are fixed in an expanded state.

  FIG. 14 shows details of the fixing means of FIG. 13, and FIGS. 14A and 14B show the end portion 30A of the annular member piece 28A having the locking portion 32A and the locking hole 24A. For example, a front view and a cross-sectional view of a state before being inserted into a box-shaped sleeve 31A having a hole are shown. The end 30A of the annular member piece 28A is inserted into the box-shaped sleeve 31A, expanded by the expansion jig 21, and then the fixing pin 35 inserted through the window 33A of the box-shaped sleeve 31A is engaged with the annular member piece 28A. The annular member piece 28A is fixed in an expanded state by fitting into the use hole 34A.

  15 and 16 show still another fixing means, which is different from the expansion band 27 in that the expansion band 37 includes annular member pieces 38A and 38B and a box-shaped sleeve 41A. As shown in detail in FIG. 16, the expansion band 37 is not provided with any particular locking holes at both ends 40A, 40B of the cut portions of the annular member pieces 38A, 38B. A window 43B is provided on the side surface. When the annular member pieces 38A and 38B are expanded by a predetermined amount by the expansion jig 21, a fixing pin 45 is inserted into a window 43B on the side surface of the box-shaped sleeve 41B, for example, a through hole, and the tip of the end portion 40A of the annular member piece 38A is inserted. 46A is positioned and fixed.

  As shown in FIG. 17, the stopper 47 in the example includes stopper pieces 47 </ b> A, 47 </ b> B, and 47 </ b> C and is inserted from the window of the box-shaped sleeve 48, and both ends of the cut portion of the expansion band 49 are fixed in the box-shaped sleeve 48. To do. As shown in FIGS. 18A to 18C, a box-shaped sleeve 49 of still another example is provided with a window 49A for inserting a stopper or a fixing pin on the side surface thereof.

  As is clear from the above description, in the present invention, since the cut portion of the annular member of the expansion band is inserted and fixed in the box-shaped sleeve, it is possible to provide a flexible joint that has a thin thickness and exhibits stable water stoppage. . Further, according to the present invention, the expansion band and the expansion jig do not have a complicated structure, and the diameter can be increased uniformly by a relatively simple operation. Therefore, an easy and reliable method for expanding the diameter of the flexible joint can be provided.

It is a cross-sectional view of an example expansion band as seen from the inner surface of the joint part structure. It is an enlarged view of the expansion band of FIG. It is a cross-sectional view of an example of the displacement absorbing portion viewed from the inner surface of the joint portion structure. It is an enlarged view of the displacement absorption part of FIG. FIG. 4 is a cross-sectional view of the displacement absorbing portion of FIG. 3 that is deformed by the displacement of the joint portion. It is an enlarged view of the displacement absorption part of FIG. It is a longitudinal cross-sectional view of the expansion band diameter-expanded by the expansion jig of one example. (A) is a front view of the expansion jig of FIG. 7, (b) is a side view of the expansion jig of (a). (A) is a front view of one annular member piece of an example, (b) is a side view of the annular member piece of (a). (A) is a front view of the other annular member piece of an example, (b) is a side view of the annular member piece of (a). (A) is a front view of an example box-shaped sleeve, (b) is a side view of the box-shaped sleeve of (a), (c) is a cross-sectional view of the box-shaped sleeve of (a), (D) is a front view of a box-shaped sleeve of another example, (e) is a side view of the box-shaped sleeve of (d), and (f) is a cross-sectional view of the box-shaped sleeve of (d). . (A) is a front view of an example fixing tool, (b) is a side view of the fixing tool of (a), and (c) is a sectional view of the fixing tool of (a). It is a longitudinal cross-sectional view of the expansion band of another example. (A) is the front view of the edge part of an annular member and a box-shaped sleeve for showing the fixed state of the expansion band of FIG. 13 in detail, (b) is a side view of (a). It is a longitudinal cross-sectional view of the expansion band of another example. (A) is the front view of the edge part of an annular member and a box-shaped sleeve for showing the fixed state of the expansion band of FIG. 15 in detail, (b) is a side view of (a). It is a front view which shows a manner to fix an expansion band by the stopper of one example. (A) is a front view of a box-shaped sleeve of still another example, (b) is a side view of the box-shaped sleeve of (a), and (c) is a sectional view of the box-shaped sleeve of (a). is there.

Explanation of symbols

1, 27, 37 Expansion band 2 Annular member 2A, 2B, 28A, 28B, 38A, 38B Annular member piece 3 Cutting part 4A, 4B, 30A, 30B, 40A, 40B End part 5, 5A, 5B, 31A, 41B, 48, 49 Box-shaped sleeve 6A, 6B, 32A, 32B Locking portion 7, 33A, 43B, 49A Window 8, 9, 47 Stopper 10, 16 Flexible joint 11, 17 Flexible member 12 Joint portion 13, 14 Tube 15 Water stop protrusion 18 Displacement absorbing portion 19 Reinforcing fiber 20 Step 21 Expansion jig 22 Main shaft 23A, 23B Expansion piece 24A, 24B Locking claw 25 Support base 26 Turnbuckle 34A, 34B Locking hole 35, 45 Fixed pin 46A Tip 47A, 47B, 47C Stopper piece

Claims (6)

  A flexible joint fixed to an inner surface of a joint portion of a pipe, comprising a flexible member and at least one pair of expansion bands arranged inside the flexible member, each expansion band being an annular member And a box-shaped body frame, the annular member has at least one cutting part, and the body frame can accommodate both ends of the cutting part, and both end parts of the cutting part The annular member is expanded in a state where both end portions of the cutting portion are accommodated in the body frame due to the expansion, and each expansion band individually presses the flexible member to the adjacent tube of the joint portion. A flexible joint characterized by that.   The flexible joint according to claim 1, wherein the flexible joint has a displacement absorbing portion.   A window is provided on a side surface of the trunk frame, and a fixing tool inserted from the window holds a predetermined distance between both ends of the cutting portion when the diameter of the annular member is increased. The flexible joint according to claim 1 or 2.   An expansion band having an annular member, wherein the annular member has at least one cut portion, and the annular member is expanded in diameter by spreading between both end portions of the cut portion. The expansion band includes a box-shaped body frame, the body frame can accommodate both ends of the cut portion, and a window is provided on a side surface of the body frame, An expansion band, wherein a fixing tool inserted from the window holds a predetermined distance between both ends of the cutting portion when the diameter is expanded.   An expansion jig for expanding the diameter of a flexible joint fixed to an inner surface of a joint portion of a pipe, wherein the flexible joint is disposed at a flexible member and an inner side of the flexible member. Each of the expansion bands includes an annular member and a box-shaped body frame, and the annular member has at least one cut portion, and an expansion treatment is provided at both ends of the cut portion. A locking portion that engages with a tool is provided, the body frame can accommodate both ends of the cutting portion, and the expansion jig includes a main shaft and at least one pair of expansion pieces at the tip of the main shaft. And when the expansion band is expanded from the inside, each locking claw engages with each locking portion at both ends of the cutting portion, The distance between the locking claws is expanded by the outward extension of the main shaft in the radial direction. Expansion tool, characterized in that said annular member is expanded in a state in which both ends of the cutting portion is accommodated in the cylinder frame by spreading between the ends of the cross-sectional portion. When attaching the flexible joint to the pipe joint from the inside of the pipe,
(1) A flexible joint is provided, wherein the flexible joint includes a flexible member and at least one pair of expansion bands disposed inside the flexible member, and the expansion band is an annular member. The annular member has at least one cutting portion, and the expansion band includes a box-shaped body frame,
(2) arranging the flexible member inside the tube;
(3) a step of arranging the annular member inside the flexible member;
(4) A step of inserting one end of the cut portion into the trunk frame,
(5) including a step of inserting the other end portion of the cutting portion into the body frame and storing both end portions of the cutting portion in the body frame; and (6) a step of expanding the diameter of the annular member. A method for attaching a flexible joint, characterized in that.

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