JP5242493B2 - Reinforcing bracket - Google Patents

Description

  The present invention relates to a reinforcing metal fitting, and in particular, relates to a reinforcing metal fitting that is attached to a connection location of an existing pipe such as a buried underground water pipe to increase the detachment prevention force.

  At the connection point of an existing pipe such as a buried underground water pipe, the insertion opening formed at the end of the other pipe is inserted into the reception opening formed at the end of one pipe, and the interval between the insertion openings A pipe joint sealed with a sealing material is employed. Among these types of pipe joints, some are configured as detachment prevention pipe joints with a mechanism for preventing slippage between the receiving port insertions, and some pipes without such a mechanism. It is configured as a joint. The seismic resistant pipe joint provided with an expansion / contraction function within a predetermined range between the receiving opening is included in the separation preventing pipe joint.

  In preparation for unforeseen circumstances such as earthquakes, it is ideal to use detachment prevention fittings at all connection points of existing pipes, and some existing pipes are being replaced with detachment prevention fittings. . However, it is not easy to replace existing pipes with separation prevention pipe joints, and replacing many existing pipes in a short period of time is technically and economically difficult and not practical. Therefore, conventionally, a reinforcing metal fitting has been proposed which can be attached to a connection location of an existing pipe so as to exhibit a detachment preventing function.

  For example, in Patent Document 1 below, a cylindrical housing that is externally fitted from the receiving port to the insertion port, a first member that engages one end of the housing with the receiving port, and the other end of the housing are related to the insertion port. The reinforcing metal fitting provided with the 2nd member to match is described. This reinforcing metal fitting has a split structure, and the housing is divided into two in the circumferential direction. Further, the retaining member (locking member) as the second member is divided into one piece in the circumferential direction or divided into a plurality along the circumferential direction. The structure of the stop member must be the latter type.

  Such a reinforcing bracket is configured such that when a pull-out force acts between the receiving opening, the claw portion (blade portion) of the retaining member bites into the outer peripheral surface of the inserting opening, thereby preventing separation. However, when the retaining member is divided into a plurality along the circumferential direction, the contact area of the claw portion with respect to the outer peripheral surface of the insertion opening is intermittently formed, so that the non-contact area formed between the contact areas Stress concentration can cause cracks in the lining layer in the tube. In addition, since the separation preventing force is not expressed in such a non-contact region, there is room for further improvement in order to prevent the separation against a strong external force caused by an earthquake or the like.

  On the other hand, in the following patent document 2 by the present applicant, a pipe joint detachment preventing device that can exhibit an excellent detachment preventing effect by arranging the claw portions of the retaining member in the pipe axis direction is proposed. Has been. Even in the reinforcing metal fittings having the split structure as described above, a structure in which the contact area of the claw portion is continuously formed like the above-described separation prevention device is adopted from the viewpoint of increasing the separation prevention force between the receiving opening. Although it is desirable to do so, no specific structure suitable for it has been known.

Japanese Patent Laid-Open No. 10-122466 JP 2008-309186 A

  The present invention has been made in view of the above circumstances, and its purpose is to exert a separation preventing function by attaching it to a connection location of an existing pipe, and also to increase the contact area of the claw portion of the retaining member to prevent separation. An object of the present invention is to provide a reinforcing metal fitting that can improve the above.

  The above object can be achieved by the present invention as described below. That is, the reinforcing metal fitting according to the present invention is a connection point of an existing pipe formed by inserting an insertion port formed at the end of the other pipe into a receiving port formed at the end of one of the pipes connected to each other. In the reinforcing metal fitting that is configured to be prevented from coming out between the receiving opening, an outer fitting member that has divided portions at a plurality of locations in the circumferential direction and is fitted to the insertion opening. The splitting portion including an engaging portion that can be engaged with the receiving port, and a retaining member that has a claw portion that can bite into the outer peripheral surface of the insertion port and is disposed at a plurality of locations in the circumferential direction. The claw portions protrude from the two split surfaces, and when the split portions are closed, the protruding claw portions are arranged so as to overlap each other in the tube axis direction.

  Since the reinforcing metal fitting according to the present invention has the above-described configuration, it can exhibit a detachment preventing function by being attached to a connection location of an existing pipe. In addition, when the dividing portion is closed, the claw portions of the retaining member protruding from both the dividing surfaces of the dividing portion are arranged so as to overlap each other in the tube axis direction. Can be continuous in the direction. As a result, the contact area of the claw portion of the retaining member can be increased, thereby improving the separation preventing force.

  In this invention, what was comprised so that the contact area | region of the said nail | claw part can be formed in the circumferential direction whole region of the said insertion opening is preferable. According to such a configuration, there is no room for the non-contact area of the claw part to be formed, and the contact area of the claw part is formed over the entire area in the circumferential direction including the vicinity of the divided part. Can be improved.

  In the present invention, in a state where a gap is provided between the two divided surfaces and the divided portion is closed, the claw portions protruding from the two divided surfaces are preferably arranged so as to overlap each other in the tube axis direction. . Thereby, it becomes easy to make the contact area | region of a nail | claw part continuous in a division part, and it can respond also to the variation in the outer diameter of an insertion port. In addition, as one aspect of the present invention, a configuration in which the claw portion is bitten by tightening a fastener attached to the divided portion is conceivable, but in that case, it is necessary to provide a gap between the two divided surfaces. The configuration is particularly useful.

  In the present invention, the flange having an insertion hole for inserting a fastener and a pair of contact surfaces extending in a direction away from each other toward the radially outer side when the division portion is closed is provided in the division portion. It is preferable to be provided and configured to open the divided portion in a V shape by bringing the pair of contact surfaces into contact with each other.

  In the mounting work of the reinforcing bracket, in order to reduce the burden on the operator and shorten the construction time, it is preferable to temporarily assemble a plurality of divided pieces constituting the external fitting member and to externally attach it to the insertion opening. It is. According to the said structure, since the contact surfaces of a flange are contact | abutted and a division part is opened in V shape, the attachment operation | work by temporary assembly can be performed stably and simply. Moreover, in this invention, since a nail | claw part protrudes from both the division surfaces of a division | segmentation part, this structure is useful also from a viewpoint of avoiding interference between nail | claw parts at the time of construction.

  In the above, the insertion hole is formed in a long hole shape, and the pair of contact surfaces are brought into contact with each other in a state where the fastener is inserted into the insertion hole, thereby opening the divided portion in a V shape. It is preferable to be configured to be able to do this. According to this configuration, while the fastener is inserted through the insertion hole of the flange, the pair of contact surfaces are brought into contact with each other to open the divided portion in a V shape. Improvement effect can be obtained more appropriately.

  In the present invention, a plurality of the claw portions extending in the circumferential direction are formed on the inner circumferential surface of the retaining member, and at least one of the claw portions is a tube with respect to the other claw portion. It is preferable that the gaps are arranged in the axial direction and the circumferential positions of both ends are shifted. According to such a configuration, it is possible to stably exhibit the biting action of the claw portion with respect to the outer peripheral surface of the insertion opening, and in addition, the claw portions overlap each other in the tube axis direction between the retaining members adjacent in the circumferential direction. Can be arranged appropriately.

The side view which shows the state which attached the reinforcement metal fitting which concerns on 1st Embodiment of this invention to the connection location of the existing pipe | tube. The figure which looked at the reinforcement metal fitting of Drawing 1 along the direction of a pipe axis Longitudinal sectional view of the reinforcing bracket shown in FIG. Diagram showing the state before attaching the reinforcing bracket Development view of the retaining member viewed from the inner periphery Sectional view when a retaining bolt is provided as a pressing member on the retaining member The figure which looked at the reinforcement metal fitting which concerns on 2nd Embodiment of this invention along the pipe-axis direction. Side view of the flange provided in the split part of the reinforcing bracket in FIG. The figure which shows a mode that the temporarily assembled reinforcement metal fitting was hung up. Half sectional view showing another embodiment of the present invention Sectional drawing of the principal part of the reinforcement metal fitting which concerns on another embodiment of this invention. The expanded view which looked at the retaining member which concerns on another embodiment of this invention from the inner peripheral side The expanded view which looked at the retaining member which concerns on another embodiment of this invention from the inner peripheral side

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a side view showing a state in which a reinforcing metal fitting 10 according to the first embodiment of the present invention is attached to a connection location of fluid pipes P1 and P2 as existing pipes. In this connection place, the insertion opening 2 formed at the end of the other pipe P2 is inserted into the reception opening 1 formed at the end of one of the pipes P1 connected to each other. Is prevented by the reinforcing metal fitting 10. The fluid pipes P1 and P2 of this embodiment are ductile iron water pipes embedded in the soil, but may be other fluid pipes such as gas pipes and plant pipes.

  FIG. 2 is a view of the reinforcing metal fitting 10 as viewed from the left in FIG. 1 along the tube axis direction. FIG. 3 is a longitudinal sectional view of the reinforcing metal fitting 10 and corresponds to the AA cross section of FIG. The presser wheel 4 fitted to the insertion port 2 compresses the annular seal member 3 by pressing it from the tube axis direction. Thereby, the space between the inner peripheral surface of the receiving port 1 and the outer peripheral surface of the insertion port 2 is sealed, and the pipe P1 and the pipe P2 are connected in a watertight manner. A T-head bolt 41 is inserted into the flange 1 a of the receiving port 1 and the flange 4 a of the press ring 4, and the receiving port 1 is compressed in a state where the press ring 4 compresses the sealing material 3 by tightening a nut 42 screwed into the bolt 41. Fixed to the connection.

  The reinforcing metal fitting 10 is attached to the connection location of the fluid pipes P1 and P2, and is configured to prevent the breakage between the receiving opening. The reinforcing metal fitting 10 has divided portions 15 at a plurality of locations in the circumferential direction, an external fitting member 11 that is externally fitted to the insertion port 2, and an outer peripheral side of the receiving port 1 that extends from the external fitting member 11 in the tube axis direction. And an engaging member 12 that can be engaged with the receiving port 1 when a pull-out force is applied between the receiving port and an outer fitting member. 11 and retaining members 13 disposed at a plurality of locations in the circumferential direction on the inner peripheral side.

  The reinforcing metal fitting 10 has a split structure that can be attached to the connection location of the pipes P1 and P2. In the present embodiment, the outer fitting member 11 has divided portions 15 at two locations in the circumferential direction, and is constituted by two divided pieces 11A and 11B as shown in FIG. The flange 16 provided in the dividing portion 15 is formed with an insertion hole 16a for inserting a fastener 17 composed of a bolt and a nut, respectively. Can be adjusted.

  With such a configuration, the reinforcing metal fitting 10 can be externally fitted and attached without removing the connection portions of the pipes P1 and P2, so that the attaching work to the existing pipe can be performed very easily. In the present invention, the outer fitting member 11 may have three or more divided portions. In the present embodiment, each of the divided portions 15 is provided with two fasteners 17 (see FIG. 1), but the number of fasteners is appropriately changed according to the required strength in consideration of the application, size, and the like. it can.

  The engaging portion 12 has a hook shape that enters the back surface of the flange 1 a of the receiving port 1, and when a pulling-out force is applied between the receiving port insertion ports, the engaging portion 12 is hooked on the flange 1 a of the receiving port 1 to be engaged. In the state of FIG. 3, the expansion / contraction allowance d is provided between the tip of the engaging portion 12 and the back surface of the flange 1a, but this may be extended or shortened, or may be omitted. When the expansion / contraction allowance d is provided, the expansion / contraction function can be imparted between the receiving opening and the seismic performance can be enhanced. In the present embodiment, the engaging portions 12 are provided at four locations in the circumferential direction, but the number of engaging portions and the length in the circumferential direction are not particularly limited.

  An annular groove 5 that opens toward the insertion slot 2 is provided on the inner peripheral surface of the outer fitting member 11, and a plurality of retaining members 13 are accommodated therein. As described above, the plurality of retaining members 13 are collectively accommodated in the annular groove 5, so that the structure can be simplified as compared with the case where they are individually accommodated. The claw portion 14 of the retaining member 13 extends in the circumferential direction while being curved along the outer peripheral surface of the insertion slot 2, and is formed in a triangular cross section. In the present embodiment, the retaining members 13 are arranged at six locations in the circumferential direction, three at each of the divided pieces 11A and 11B, but the number of retaining members and the length in the circumferential direction are not particularly limited.

  An inclined surface 13a having a large diameter toward the receiving port 1 is formed on the outer side surface of the retaining member 13, and contacts the tapered surface 51 of the annular groove 5 inclined in the same direction from the inside. Yes. Therefore, when an external force is applied that causes the insertion slot 2 to move away from the receptacle 1 in the tube axis direction, the retaining member 13 is pressed toward the insertion slot 2 by the wedge effect, and the claw portion 14 contacts the outer peripheral surface of the insertion slot 2. The resistance can be increased to increase the separation preventing force.

  FIG. 5 is a developed view of the retaining member 13 as viewed from the inner peripheral side. In the present embodiment, as the retaining member 13, two types of retaining member 13A and retaining member 13B are employed, which are alternately arranged and are adjacent to each other in the circumferential direction. The retaining member 13A has, as the claw portion 14, two claw portions 14A1 and 14A2 arranged in parallel with a gap in the tube axis direction. Similarly, the retaining member 13B also has two claw portions 14B1. , 14B2. The claw portion 14A1 and the claw portion 14B1, and the claw portion 14A2 and the claw portion 14B2 are respectively disposed at the same tube axis direction position.

  In each of the retaining members 13A and 13B, one of the two claw portions is arranged with the circumferential positions of both end portions shifted from the other. That is, in the retaining member 13A, the claw portion 14A1 is longer than the claw portion 14A2, and the claw portion 14A1 protrudes in the circumferential direction from both ends of the claw portion 14A2. In the retaining member 13B, the claw portion 14B2 It is longer than 14B1, and the claw portion 14B2 projects in the circumferential direction from both ends of the claw portion 14B1. In this way, the claw portion 14A1 of the retaining member 13A and the claw portion 14B2 of the retaining member 13B are arranged so as to overlap each other in the tube axis direction.

  As shown in FIG. 4, split surfaces 15 a and 15 b facing each other are extended along the radial direction in the split portion 15 of the outer fitting member 11. In this invention, the nail | claw part 14 protrudes from both the dividing surfaces 15a and 15b, and when the division | segmentation part 15 is closed like FIG. 2, it arrange | positions so that the protruding nail | claw parts 14 may overlap in a pipe-axis direction. Thereby, also in the division | segmentation part 15, the contact area of the nail | claw part 14 can be made to continue in the circumferential direction, and the contact prevention area of the nail | claw part 14 with respect to the outer peripheral surface of the insertion port 2 can be increased, and detachment prevention power can be improved.

  Specifically, a split portion 15 is set between a pair of adjacent retaining members 13, and one of the pair of retaining members 13 is a retaining member 13A and the other is a retaining member 13B. The claw portion 14A1 protrudes from the dividing surface 15a, and the claw portion 14B2 protrudes from the dividing surface 15b. And in the state which fastened the fastener 17 and closed the division | segmentation part 15, as shown in FIG. 5, claw part 14 A1 and claw part 14 B2 mutually overlap and are arrange | positioned in a pipe-axis direction. The protrusion length p of the nail | claw part 14 on the basis of the division surfaces 15a and 15b is about several mm-about 10 and several mm.

  In the present invention, although the reinforcing metal fitting 10 has a split structure, since the contact area of the claw part 14 is continuous in the circumferential direction also in the divided part 15 as described above, the contact of the claw part 14 in the entire circumferential direction of the insertion slot 2 is achieved. Regions can be formed. In this case, the ratio of the circumferential length of the contact area of the claw portion 14 with respect to the outer peripheral surface of the insertion slot 2 is 100%, and the separation preventing force can be effectively improved.

  The claw portions 14 protruding from the two split surfaces 15a and 15b are arranged so as to overlap each other in the tube axis direction at least when each claw portion 14 bites into the outer peripheral surface of the insertion slot 2. However, since the movement stroke in the radial direction of the retaining member 13 is about several millimeters due to the structure, the claw portions 14 are arranged in advance so as to overlap each other in the tube axis direction before the claw portions 14 are bitten. May be.

  Although the circumferential direction length of the area | region where nail | claw parts 14 overlap in the pipe-axis direction is 5-8 mm, for example, this invention is not limited to this. The interval between the claw portions 14 adjacent in the circumferential direction, that is, the interval between the claw portion 14A1 and the claw portion 14B1, and the interval between the claw portion 14A2 and the claw portion 14B2 are, for example, 1 to 3 mm. It is not limited to.

  As shown in FIG. 2, in the present embodiment, the claw portions 14 protruding from both the divided surfaces 15 a and 15 b are in a state in which the gap G is provided between the divided surfaces 15 a and 15 b and the divided portion 15 is closed. It arrange | positions so that it may overlap with a pipe-axis direction. Thereby, it becomes easy to make the contact area | region of the nail | claw part 14 continue in the division part 15, and it can respond also to the variation in the outer diameter of the insertion port 2. FIG. In the present embodiment, the inner peripheral surface of each retaining member 13 abuts on the outer peripheral surface of the insertion opening 2 with the gap G provided in the divided portion 15, and the fastener 17 is tightened from the inner peripheral surface so that the claw portion 14 is Since it is configured so as to bite in, it is necessary to provide the gap G in the dividing portion 15, and this configuration is particularly useful.

  When attaching the reinforcing metal fitting 10 to the connection location of the pipes P1 and P2, the division pieces 11A and 11B are brought close to each other from the state shown in FIG. Then, the fastener 17 may be tightened until the tip of the claw portion 14 bites into the outer peripheral surface of the insertion slot 2 lightly. When the withdrawal force acts between the receiving opening, the claw portion 14 bites into the inserting opening 2 increases due to the wedge effect as described above.

  Both split surfaces 15a and 15b are provided with alignment guides (not shown in FIGS. 1 and 2) including projections 6a and fitting holes 6b into which the projections 6a are fitted at positions where they do not interfere with the fastener 17. For this reason, when the external fitting member 11 is externally attached to the insertion opening 2, the division part 15 can be closed in a state where the relative positions of the division pieces 11A and 11B are accurately adjusted. As a result, it is possible to prevent the claw portions 14 protruding from the divided surfaces 15a and 15b from being damaged due to interference during construction.

  In the present embodiment, since the outer fitting member 11 sandwiches the insertion opening 2 from the vertical direction in FIG. 2, the retaining member 13 disposed in the center of each of the divided pieces 11 </ b> A and 11 </ b> B 14 is pressed evenly against the insertion slot 2. However, in the other retaining members 13, there is a risk that the wedge effect may be hindered by being biased and biased. When there is such a concern, it is useful to provide a pressing member that presses the retaining member 13 radially inward.

  For example, if the retaining bolts 13 as shown in FIG. 6 are provided on the retaining members 13 provided at both ends of each of the divided pieces 11A and 11B, after the outer fitting member 11 is mounted, the pushing bolts 7 are operated. By pressing the retaining member 13 toward the insertion opening 2, the claw portion 14 can be pressed evenly. Thereby, when the withdrawal force acts between the receptacle insertion holes, the wedge effect in each retaining member 13 is expressed evenly, and the improvement effect of the separation preventing force can be ensured.

  In the above, an example is shown in which the gap G is provided between the two split surfaces 15a and 15b and the claw portion 14 is bitten by tightening the fastener 17, but the present invention is not limited to this, and the split portion 15 is There may be a case in which no gap is provided between the two divided surfaces 15a and 15b when closed. In that case, since the claw portion 14 cannot be bitten by tightening the fastener 17, it is preferable to install a pressing member such as the pressing bolt 7 in FIG. 6 on each of the retaining members 13.

[Second Embodiment]
FIG. 7 is a view of the reinforcing metal fitting 20 according to the second embodiment of the present invention as seen along the tube axis direction. Since the reinforcing metal fitting 20 has substantially the same configuration and operation as the above-described reinforcing metal fitting 10 except for the structure described below, the differences will be mainly described with the common points omitted.

  The reinforcing metal fitting 20 includes divided portions 25 at four locations in the circumferential direction, and includes an outer fitting member 21 including four divided pieces 21A to 21D. The engaging portions 22 and the retaining members 23 are provided at 14 places in the circumferential direction, and four are assigned to each of the divided pieces 21A and 21C, and three are assigned to the divided pieces 21B and 21D. Similarly to the first embodiment, in each of the divided portions 25, the claw portions 24 protrude from both divided surfaces, and the protruding claw portions 24 are arranged so as to overlap with each other in the tube axis direction.

  Each divided portion 25 has a pair of contact surfaces extending in a direction away from each other toward the radially outer side in a state where the divided portion 25 is closed, with an insertion hole 26a through which a fastener 27 made of a bolt and a nut is inserted. A flange 26 having 28 is provided. In the present embodiment, the flange 26 has three insertion holes 26a as shown in FIG. 8, and one of the insertion holes 26a1 is formed in a long hole shape.

  At the time of construction, in order to reduce the burden on the operator and shorten the construction time, it is desirable to tentatively assemble the divided pieces 21A to 21D in advance and attach them to the connection locations of the pipes P1 and P2. In addition, when the diameter of the existing pipe is relatively large (for example, nominal diameter of φ500 or more), the divided pieces 21A to 21D are heavy, so they are lifted by a crane and mounted from above by lowering work. Is preferred.

  FIG. 9 shows a state in which the temporarily assembled reinforcing metal fitting 20 is suspended. The upper ends of the wires 8 connected to the divided pieces 21A and 21B are connected to a crane (not shown). In each divided portion 25, the fastener 27 is loosely fastened except between the divided piece 21C and the divided piece 21D. At this time, a pair of contact surfaces 28 inclined in a taper shape are brought into contact with each other, whereby the dividing portion 25 is guided so as to open in a V shape, and attachment work by temporary assembly can be performed stably and simply. it can. Moreover, the nail | claw part 24 which protruded from both the division surfaces can be spaced apart in the circumferential direction by opening the division part 25 in V shape, and it can prevent that they interfere and damage at the time of construction.

  In this temporarily assembled state, the fastener 27 is inserted only into the insertion hole 26a1 formed in the shape of a long hole, and the dividing portion 25 can be opened in a V shape even when the fastener 27 is inserted into the insertion hole 26a. ing. When the temporarily assembled reinforcing metal fitting 20 is lowered and externally fitted to the connection portion of the pipes P1 and P2 from above, the fasteners 27 inserted into the respective insertion holes 26a are tightened to close the dividing portion 25, the state shown in FIG. It becomes. Thus, according to this embodiment, the operation | work which carries out the external fitting member 21 to the insertion opening 2 becomes stable and becomes simple.

[Other Embodiments]
(1) The present invention is not limited to the embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention. Therefore, for example, the shape and size of each member constituting the reinforcing metal fitting of the present invention can be appropriately changed.

  (2) In the above-described embodiment, the example in which the mechanical type pipe joint that compresses the sealing material by bringing the push ring close to the receiving port is used at the connection portion of the existing pipe is shown, but the present invention is not limited thereto. Instead, the receiving port 9 as shown in FIG. 10 may be a slip-on type pipe joint having a self-sealing function. The reinforcing bracket 30 is configured such that the engaging portion 32 can be engaged with the step portion 9 a of the receiving port 9 when a pulling force acts between the receiving ports. Also in such a structure, the claw portions 34 of the retaining member 33 protrude from both divided surfaces of the divided portion 35, and the protruding claw portions are arranged so as to overlap in the tube axis direction.

  (3) In the above-described embodiment, the example in which the hook-like engaging portion is hooked on the flange of the receiving port when the pulling force acts between the receiving port insertion holes is shown. For example, a retaining member having a claw portion that can bite into the outer peripheral surface of the receiving port may be disposed in the engaging portion so that the engaging portion is engaged with the receiving port.

  Moreover, in this invention, it is not restricted to what hooks an engaging part on the flange of a receiving opening, You may engage using an engaging tool. For example, in the reinforcing metal fitting 60 shown in FIG. 11, the engaging part 62 is comprised by the engaging tool which consists of the volt | bolt 62a and the nut 62b. The bolt 62a is a T-head bolt having a head disposed on the back side of the flange 1a of the receiving port 1. The bolt 62a passes through the flange 4a of the press wheel 4 and the flange 61a of the outer fitting member 61 and is fastened by a nut 62b. Yes. When a pulling-out force is applied between the receiving opening, the reinforcing metal fitting 60 is engaged with the receiving opening 1 by the engaging portion 62, and the claw portion 64 of the retaining member bites into the outer peripheral surface of the inserting opening 2.

  When the reinforcing metal fitting 60 is attached, the existing bolt (T-head bolt 41 in FIG. 3) connecting the flange 1a and the flange 4a is replaced with a longer T-head bolt 62a, and the bolt 62a is inserted. What is necessary is just to insert in the flange 61a of the external fitting member 61 externally fitted by the opening | mouth 2, and to fasten with the nut 62b. The replacement with the bolt 62a is performed at a plurality of locations in the circumferential direction, for example, every other location. According to the reinforcing metal fitting having such a configuration, it is possible to suppress the outward protrusion in the radial direction and to reduce the cost.

  (4) In the present invention, as illustrated in FIG. 5, a plurality of claw portions extending in the circumferential direction are formed on the inner peripheral surface of the retaining member, and at least one claw portion of the claw portions is the other. It is preferable that the claw portions are arranged so as to be spaced apart from each other in the tube axis direction and the circumferential positions of both end portions are shifted. In addition, as shown in FIG. 12, even if it uses a kind of retaining member, it is possible to make the contact area | region of a nail | claw part continue in the circumferential direction. The retaining member 13 </ b> C has two claw portions 14 </ b> C <b> 1 and a claw portion 14 </ b> C <b> 2 that are displaced from each other in the circumferential direction.

  (5) In the above-described embodiment, the example in which the retaining member has the two claw portions is shown, but the number of the claw portions is not limited to this, and may be one or three or more. In FIG. 13, the retaining members 13D and 13E each have one claw portion 14D and 14E, and the claw portion 14D and the claw portion 14E are arranged so as to overlap each other in the tube axis direction.

DESCRIPTION OF SYMBOLS 1 Receiving port 2 Inserting port 3 Sealing material 4 Push ring 10,20 Reinforcement metal fittings 11,21 Outer fitting member 12,22 Engaging part 13,23 Detachment member 14,24 Claw part 15,25 Dividing part 15a, 15b Dividing surface 16 , 26 Flange 16a, 26a Insertion hole 17, 27 Fastener 28 Contact surface P1, P2 Fluid pipe (existing pipe)

Claims (6)

It is attached to the connection place of the existing pipe formed by inserting the insertion opening formed at the end of the other pipe into the reception opening formed at the end of one pipe connected to each other. Reinforcing metal fittings configured to prevent slipping out at
An outer fitting member that has divided portions at a plurality of locations in the circumferential direction, and is fitted to the insertion port.
An engaging portion engageable with the receptacle;
It has a claw portion that can bite into the outer peripheral surface of the insertion port, and a retaining member disposed at a plurality of locations in the circumferential direction,
Reinforcing metal fittings, wherein the claw portions protrude from both split surfaces of the divided portion, and the protruding claw portions are arranged so as to overlap each other in the tube axis direction when the divided portion is closed. .   The reinforcement metal fitting of Claim 1 comprised so that the contact area | region of the said nail | claw part could be formed in the circumferential direction whole region of the said insertion port.   The claw part which protruded from the both division surfaces is arranged so that it may overlap in the direction of a pipe axis in the state where a gap was provided between both the division surfaces and the division part was closed. Reinforcing metal fittings.   The split portion is provided with a flange having an insertion hole for inserting a fastener and a pair of contact surfaces extending in a direction away from each other toward the radially outer side when the split portion is closed, The reinforcing metal fitting according to any one of claims 1 to 3, which is configured to open the divided portion in a V shape by bringing a pair of contact surfaces into contact with each other.   The insertion hole is formed in a long hole shape, and the pair of contact surfaces can be brought into contact with each other in a state where the fastener is inserted through the insertion hole, so that the divided portion can be opened in a V shape. The reinforcing metal fitting according to claim 4, which is configured as follows.   A plurality of the claw portions extending in the circumferential direction are formed on the inner peripheral surface of the retaining member, and at least one of the claw portions is spaced from the other claw portion in the tube axis direction. The reinforcing metal fitting according to any one of claims 1 to 5, wherein the reinforcing metal fittings are arranged with the circumferential positions of both ends being shifted.

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