JPH09287393A - Joint device for segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join segments by single operation. SOLUTION: In a joint device for abutting the end faces of two segments 1A, 1B and mutually joining the end faces, a pin type male metal fitting 10 protruded from the end face of one segment 1A and a cylinder body 25 as a recessed type female metal fitting, which is installed to the end face of the other segment 1B and into which the male metal fitting 10 is received, are mounted. The male metal fitting 10 has a head section 15, in which a diameter is increased, at a front end while having a tapered section 16 on the front side of the head section 15 and a constricted section 17, in which the diameter is reduced, on the rear side of the head section 15. The cylinder body 25 as the female metal fitting has an engaging piece 27a, which is displaced to the outside in the radial direction by pushing to the tapered section 16 when the male metal fitting 10 is inserted and returned and displaced to the inside in the radial direction with passage on the head section 15, in which the diameter is increased, and engaged with the constricted section 17, in the inlet of the cylinder body 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint device for a segment mainly used for lining a shield tunnel.

[0002]

Most segment joints used in shield tunnels are bolted. FIG. 16 shows a general example. In this joint structure, joint plates 110 and 110 are provided on the connection end faces of the segments 100A and 100B, respectively, and bolt boxes 112 and 112 are provided in a form in which their backs are notched so that both segments 100A and 100B to be connected are connected.
The joint plates 110 of 110 are butted against each other, the bolt 115 is inserted through them, and the nut 116 is fastened.

[0003]

By the way, with the recent increase in the diameter of shield tunnels, the number of bolts in joints of segments has also increased. Therefore, the tightening time of the bolt is increased, and there is a demand for improving the efficiency of the joining work. There has also been a demand for a joint device suitable for automatically assembling segments by an automatic machine.

In view of the above circumstances, it is an object of the present invention to provide a segment joint device capable of joining segments with one touch, shortening the joining work time, and easily adapting to an automatic assembly system. To do.

[0005]

According to a first aspect of the present invention, there is provided a joint device for abutting end faces of two segments and joining them to each other, and a pin type projecting on an end face of one segment to be joined. A male metal fitting and a concave female metal fitting provided on the end face of the other segment and receiving the male metal fitting are provided, and the male metal fitting has a large-diameter head at the tip and a tapered taper on the front side of the head. And a constricted portion with a small diameter on the back side, the female metal fitting is displaced outward in the radial direction by being pushed by the taper portion when the male metal fitting is inserted into the entrance of the female metal fitting, It is characterized in that it has an engaging portion which is displaced inward in the radial direction and is engaged with the constricted portion with the passage of the head portion.

In this joint device, when the male fitting is inserted into the female fitting when the end faces of the segments are butted against each other, the inlet of the female fitting is widened as the head of the male fitting enters.
As the insertion is completed, the inlet of the female fitting is narrowed, the engaging portion of the inlet is fitted into the constricted portion, and the female fitting and the male fitting are coupled.

According to a second aspect of the present invention, in the first aspect, a joint box is provided inside the end surface of the other segment, and the female metal member is a cylindrical body disposed in the joint box. The body has a front end opening that is exposed to the outside from the end surface of the segment and a rear end that is fixed to the joint box. A space is provided on the outer peripheral side of the divided piece to allow the outward displacement of the divided piece, and an engaging piece serving as the engaging portion is provided on the inner periphery of the tip of the divided piece. It is characterized by

In this joint device, when the male fitting is inserted into the inlet of the cylindrical body when the end faces of the segments are butted against each other, the head of the male fitting collides with the engaging piece provided at the tip of the divided piece of the cylindrical body. Together, the split pieces split by the slits bend outward. As a result, the engagement piece is pushed outward in the radial direction, the inlet of the cylindrical body is widened, and the head of the male fitting is inserted inside. When the head of the male fitting completely enters the cylindrical body, the engaging piece returns to its original position and fits into the constricted portion of the male fitting, so that the female fitting and the male fitting are coupled. After joining, it is also possible to inject a fast-curing resin or the like into the joint box to solidify it and restrain the bending of the divided pieces to ensure that the male fitting is prevented from coming off.

According to a third aspect of the present invention, in the second aspect, the joint box is fixed behind a joint plate provided on an end face of the segment, and a tip end of the cylindrical body is inserted through an insertion hole provided in the joint plate. The feature is that the opening faces the outside.

In this joint device, since the joint plate is provided on the end face of the segment and the joint box is fixed to the rear of the joint plate, the coupling force of the male and female metal fittings is transmitted to the wide range of the segment through the joint plate.

According to a fourth aspect of the present invention, in the first aspect, a joint plate is provided on an end surface of the other segment, and a joint box is provided behind the joint plate, and the female metal member includes the joint plate and the joint box. And a ring-shaped leaf spring having a central hole smaller in diameter than the head of the male fitting, the leaf spring having an outer peripheral portion fixed and corresponding to the insertion hole of the joint plate. Having a plurality of slits extending radially from the hole, the split piece divided in the circumferential direction by the slit, each inner peripheral portion is flexible in the depth direction from the joint plate,
Moreover, the bending is limited by the joint plate in the joint plate direction, and the inner peripheral end of each divided piece serves as the engaging portion.

In this joint device, when the male fittings are inserted into the central holes of the leaf springs when the end faces of the segments are butted against each other, the heads of the male fittings abut against the split pieces by the slits, and the split pieces respectively Flexes in the depth direction. As a result, the central hole of the leaf spring surrounded by the inner peripheral edge of the divided piece is expanded, and the head of the male fitting is inserted inside. When the head of the male fitting is completely inside the leaf spring, the split pieces of the leaf spring return to their original positions, and the inner peripheral parts engage the constricted portion of the male fitting to separate the female fitting and the male fitting. Be combined. In this case, even if the retaining force acts on the male fitting, the split piece cannot be pulled out because the joint plate restricts the bending in the pulling direction. After joining, it is also possible to inject a fast-curing resin or the like into the joint box to solidify it and restrain the bending of the divided pieces to ensure that the male fitting is prevented from coming off.

According to a fifth aspect of the present invention, in the first aspect, a joint box is provided inside the end surface of the other segment, and the female metal fitting is composed of a plurality of fasteners arranged in the joint box. , Each of these fasteners is arranged on the circumference so as to form a receiving hole for the male fastener,
Further, the outer circumference is elastically supported by a cylindrical backup rubber arranged between the outer circumference thereof and the inner circumference of the joint box, and an engaging piece as the engaging portion is provided on the inner circumference of the tip of each stopper. It is characterized by being.

In this joint device, when the end faces of the segments are butted against each other, the male metal fitting is inserted into the center of the metal fitting (the entrance of the female metal fitting) provided on the circumference, and the male metal fitting is provided at the inner circumference of the tip of the metal fitting. The head of the male fitting collides with the engaging piece and the stopper is displaced outward against the elastic force of the backup rubber. As a result, the entrance surrounded by the fasteners expands, and the head of the male fitting enters. When the head of the male fitting is completely inside, the engaging piece returns to its original position by the restoring force of the backup rubber, and is fitted into the constricted portion of the male fitting, so that the female fitting and the male fitting are coupled. Hard rubber is used as the backup rubber.

According to a sixth aspect of the present invention, in the fifth aspect, an elastic washer is inserted between the backup rubber and the joint plate, the elastic washer allowing the displacement of the stopper to the joint plate side. To do.

In this joint device, since the elastic washer is sandwiched between the backup rubber and the joint plate, the elastic washer allows some displacement of the stopper to the joint plate side and absorbs the deformation between the joints.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the base end portion of the male fitting is fastened to a joint plate fixed to an end surface of the one segment. Characterize.

The invention of claim 8 is characterized in that, in any one of the inventions of claims 1 to 6, the base end portion of the male fitting is fastened to an insert fitting embedded in the end face of the segment.

A ninth aspect of the present invention is characterized in that, in any of the first to eighth aspects, the male fitting is provided so that a fastening position can be adjusted in the axial direction.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIGS. 1 to 3 show a joint device according to a first embodiment. This joint device, as shown in FIG. 1 and FIG.
One precast concrete segment 1A, 1
B for joining the end faces of B to each other, and a pin type male metal fitting 10 projecting from the end surface of one segment 1A and a concave female metal fitting provided on the end surface of the other segment 1B ( And a cylindrical body 25) described later. Here, one segment 1A is a segment to be assembled, and the other segment 1B is a segment already assembled. Metal joint plates 2A and 2B are provided on the joint end faces of the segments 1A and 1B, and these joint plates 2A and 2B are firmly held by the anchor bars 3 and 3 arranged inside the segments 1A and 1B. ing.

On the end face of one segment 1A, a joint box 4 is provided behind the joint plate 2A. An insertion hole 5 is formed in the joint plate 2A so as to communicate with the joint box 4. A pin-type male fitting 10 is attached to the insertion hole 5 of the joint plate 2A. The male fitting 10 has a seat 1 having a diameter larger than that of the insertion hole 5 in the longitudinal middle portion.
1, a screw shaft 12 is provided on the base end side of the seat 11, and a head 15 having a large diameter is provided on the tip end side of the seat 11. Further, a tapered portion 16 is provided on the front side of the head portion 15, and a constricted portion 17 having a small diameter is provided on the back side of the head portion 15. The male fitting 10 is configured such that the screw shaft 12 is passed through the insertion hole 5 from the outside of the joint plate 2A, and in that state, the nut 14 is tightened on the screw shaft 12 via the washer 13 on the back side of the joint plate 2A. It is firmly fastened to 2A and protrudes in a direction perpendicular to the joint plate 2A. The space of the joint box 4 is the size of the nut 1
It suffices to provide 4 to such an extent that it can be tightened.

On the end face of the other segment 1B, a cylindrical body 25 is provided as a concave female metal fitting for receiving the head portion 15 of the male metal fitting 10. A metal joint box 21 is provided behind the joint plate 2 </ b> B, and the cylindrical body 25 is arranged in the joint box 21. The cylindrical body 25 is arranged such that its front end opening 28 faces the outside through the insertion hole 7 of the joint plate 2B, and its rear end is welded and fixed to the inner wall of the joint box 21.

Further, as shown in FIG. 2, a plurality of slits 26 are formed vertically on the peripheral wall of the cylindrical body 25,
The slit 26 divides the peripheral wall into a plurality of pieces in the circumferential direction. Then, the plurality of divided pieces 27 are capable of bending in the radial direction of the cylindrical body 25, and on the outer peripheral side of the cylindrical body 25, between the joint box 21 and the outer side of the cylindrical body 25 to allow the bending. A predetermined space 22 is secured. Further, an engagement piece 27a having a triangular cross section is provided as an engagement portion on the inner circumference of the tip end of the divided piece 27. Engagement piece 2
7a forms a front end opening (entrance) 28 of the cylindrical body 25, and when the male fitting 10 is received in the opening 28, it is displaced radially outward by being pushed by the tapered portion 16, As the large head portion 15 passes, the head portion 15 is returned inward in the radial direction to be displaced and engaged with the constricted portion 17.

Next, the operation will be described. In this joint device,
When abutting the end faces of the segments 1A and 1B,
The male fitting 10 is inserted through the insertion hole 7 of the joint plate 2B of the mating segment 1B. At this time, since the tapered portion 16 is provided at the tip of the male fitting 10, the tapered portion 1
6 guides the insertion of the male fitting 10 into the insertion hole 7, and as a result, performs the aligning action of the segments 1A and 1B. When the tip of the male fitting 10 is inserted through the insertion hole 7, the tapered portion 16 enters the tip opening 28 of the cylindrical body 25 on the inner side thereof. Then, when the tapered portion 16 abuts on the engaging piece 27a provided on the inner circumference of the tip of the divided piece 27 of the cylindrical body 25, the divided piece 27 divided by the slit 26 bends outward. As a result, the engagement piece 27a is pushed outward in the radial direction, the tip end opening 28 of the cylindrical body 25 expands, and the large-diameter head portion 15 of the male fitting 10 enters inside.

As shown in FIG. 3, the head portion 15 of the male fitting 10 is shown.
Passes through the engaging piece 27a and the head 15 is completely
When it enters into 5, the divided piece 27 is elastically restored and the engaging piece 2
7a returns to the original inward position, and the engagement piece 27a becomes the male fitting 1.
The male fitting 10 and the cylindrical body 25, which is the female fitting, are fitted into the constricted portion 17 of 0, and the two segments 1A and 1B are joined together. After coupling, the joint box 21
A filling curing agent 30 such as a fast-curing resin is injected into the space 22 inside and solidified, and the bending of the divided piece 27 is restrained.
It is also possible to ensure the retention of the.

According to this joint device, the segments 1A,
By fitting the male fitting 10 into the cylindrical body 25, which is the female fitting, in accordance with the butting of 1B, the segments 1A and 1B can be joined with one touch, and the joining work can be completed in a short time. . Further, since the male and female fittings can be connected with one touch, it is possible to easily cope with automatic assembly. Also, the joint plate 2A fixed to the anchor bar 3,
Since the male fitting 10 and the cylindrical body 25 (via the joint box 21) are attached to the 2B, respectively, the coupling force of the female and male fittings is passed through the joint plates 2A, 2B and the anchor muscles 3, and the whole of the segments 1A, 1B. Can be told.

[Second Embodiment] FIG. 4 shows a joint device according to a second embodiment. In this joint device, one segment 1
The joint plate 2A (see FIG. 1) is not provided in A, the insert fitting 19 is embedded in the precast concrete, and the screw shaft 12 of the male fitting 10 is directly fastened to the insert fitting 19. The other configuration is the same as that of FIG. In this way, one joint plate can be omitted, and the cost can be reduced.

[Third Embodiment] FIGS. 5 to 7 show a joint device according to a third embodiment. In this joint device, as shown in FIG. 5, instead of the cylindrical body 25 (see FIG. 1), a ring-shaped leaf spring 40 is provided as a female metal fitting. Leaf spring 4
0 is arranged between the joint plate 2B and the joint box 21, and the outer peripheral portion is fixed. The leaf spring 40 has a central hole 43 whose diameter is smaller than that of the head 15 of the male fitting 10B, and the central hole 43 is arranged so as to correspond to the insertion hole 7 provided in the joint plate 2B.

As shown in FIG. 6, the leaf spring 40 has a plurality of slits 41 extending radially from the central hole 43, and is divided into a plurality of (here, eight) slits 41 in the circumferential direction. As shown in FIG. 5, each of the divided pieces 42 is slightly curved toward the inner side of the joint box 21, and the inner peripheral side of each of the divided pieces 42 is more flexible in the depth direction than the joint plate 2B. Further, the bending of the joint plate 2B in the direction of the joint plate 2B is limited by the back surface 7a of the joint plate 2B. The inner peripheral end of each of the divided pieces 42 is an engaging portion that engages with the constricted portion 17a of the male fitting 10B. The male fitting 10B in this case is
The shape of the constricted portion 17a is slightly different from the constricted portion 17 of the male fitting 10 of the first embodiment due to the engagement of the inner peripheral end of the split piece 42. The other configuration is the same as that of the first embodiment shown in FIG.

Next, the operation will be described. In this joint device,
When abutting the end faces of the segments 1A and 1B,
The male fitting 10B is inserted through the insertion hole 7 of the joint plate 2B of the mating segment 1B. Then, the tip taper portion 16 of the male fitting 10B enters the center hole 43 of the leaf spring 40. Then, when the tapered portion 16 abuts on the inner peripheral end of the divided piece 42 formed by the slit 41, the divided pieces 42 are respectively bent in the depth direction. As a result, the central hole 43 of the leaf spring 40 surrounded by the inner peripheral edge of the divided piece 42 expands, and the male fitting 10
B's head 15 goes inside.

As shown in FIG. 7, when the head portion 15 of the male fitting 10B is completely inside the leaf spring 40, the split piece 42 of the leaf spring 40 returns to its original position, and the inner peripheral edge of each split piece 42 is removed. By engaging the constricted portion 17 of the male fitting 10B, the female fitting 10B and the leaf spring 40, which is a male fitting, are joined together, whereby the two segments 1A, 1B are joined together. In this case, even if the retaining force acts on the male fitting 10B, the split piece 42 does not come off because the joint plate 2B restricts the bending in the removal direction.
After the connection, the space 22 inside the joint box 21 is filled with a filling and solidifying agent 30 such as a quick-hardening resin to be solidified, and the bending of the split piece 42 is restrained to ensure the retaining of the male fitting 10B. it can.

[Fourth Embodiment] FIGS. 8 to 10 show a joint device according to a fourth embodiment. In this joint device, as shown in FIG. 8, a female metal fitting 50 composed of a plurality of fasteners 51 is arranged in the joint box 21. Each stopper 51 is
As shown in FIG. 9, in order to form the receiving hole 52 of the male fitting 10, they are arranged at a slight interval 53 on the circumference, and are arranged between the outer circumference thereof and the inner circumference of the joint box 21. The outer circumference is elastically held by a thick cylindrical hard backup rubber 55. Engaging pieces 51a as engaging portions are formed on the inner circumference of the tip of the stopper 51. Further, as shown in FIG. 10, when the engagement piece 51 a is fitted into the constricted portion 17, the engagement piece 51 a
The back surface 15a of the head portion 15 of the male fitting 10 that engages with the retainer
And the end surface 51b of the engaging piece 51a facing it,
Small irregularities for slip prevention are formed. The other configuration is similar to that of the first embodiment shown in FIG.

In this joint device, the segments 1A, 1B are
When the end faces of the male fitting 10 are butted against each other, the male fitting 10 is inserted into the receiving hole 52 (the entrance of the female fitting 50) at the center of the fastening fitting 51 arranged on the circumference. Then, the tip tapered portion 16 of the male fitting 10 abuts on the engaging piece 51a provided on the inner circumference of the tip of the stopper 51, and the stopper 51 is displaced outward against the elastic force of the backup rubber 55. This allows
The inlet (receiving hole 52) of the female fitting 50 expands, and the head portion 15 of the male fitting 10 enters inside. Completely the head 1 of the male fitting 10
When 5 goes inside, the stopper 51 is the backup rubber 55
Return to the original position by the restoring force of the engaging piece 51a
The female fitting 10 and the male fitting 50 are joined by fitting in the constricted portion 17 of 0. Further, in this state, the end surface 51b of the engagement piece 51a and the back surface 15a of the head portion 15 of the male fitting 10 are engaged in a non-slip state, so that the male fitting 10 is reliably prevented from coming off.

[Fifth Embodiment] FIG. 11 shows a joint device according to a fifth embodiment. In this joint device, by using the male fitting 10C without the seat 11 (see FIG. 1), the nut 1
4C allows the axial fastening position of the male fitting 10C to be adjusted. Therefore, the coupling force can be increased by tightening the nut 14C after coupling the male and female metal fittings 10, 50. The other configuration is the fourth in FIG.
This is the same as the embodiment.

[Sixth Embodiment] FIGS. 12 to 15 show a joint device according to a sixth embodiment. In this joint device, as shown in FIG. 12, an elastic washer 60 which allows the stopper 51B to be displaced toward the joint plate 2B is sandwiched between the backup rubber 55 and the joint plate 2B. 6
By 0, the front end of the stopper 51B is stopped. The elastic washer 60 has a central hole 61 corresponding to the insertion hole 7 of the joint plate 2B. Also, as shown in FIG.
The stopper 51B forming the female stopper 50B has a smaller width in the circumferential direction.
A large space 53B is secured between 1B. The other configuration is the same as that of the fourth embodiment in FIG.

In this joint device, when the male fitting 10 is inserted into the receiving hole 52 at the center of the female fitting 50B, as shown in FIG. 14, the engaging fitting 51a provided on the inner circumference of the tip of the stopper 51B is fitted to the male fitting. The tip taper part 16 of 10 collides,
The stopper 51B is displaced outward against the elastic force of the backup rubber 55. As a result, the receiving hole 52 of the female metal fitting 50B expands, and the head portion 15 of the male metal fitting 10 enters inside.
When the head part 15 of the male fitting 10 is completely in the inside, as shown in FIG. 15, the stopper fitting 51B returns to the original position by the restoring force of the backup rubber 55, and the engaging piece 51a is constricted in the male fitting 10. The female metal fitting 10 and the male metal fitting 50 are fitted to each other by being fitted into the metal fitting 17. In this coupled state, the presence of the elastic washer 60 allows some displacement of the stopper 51B to the joint plate 2B side, so that the deformation between the joints can be absorbed.

In addition, in the third to sixth embodiments, the male metal fitting 1 is used.
Needless to say, the attachment on the 0 side may be performed using an insert fitting as shown in FIG. Further, in the above embodiment, the case of the segment of the shield tunnel was taken as an example, but the range of the segment referred to here is a member made of precast concrete for civil engineering and construction, and all members that are sequentially joined during assembly are used. Including. For example, a retaining wall block, a U-shaped groove block, a floor slab, a wall slab, a beam material, and a pillar material are also included.

[0038]

As described above, according to the first aspect of the invention, the segments can be joined with one-touch by inserting the male fittings into the female fittings when the segments are butted. It can be completed in a short time. Also, since the male and female fittings can be combined with one touch,
It can easily support automatic assembly.

According to the invention of claim 2, as the female metal fitting,
The effect of the invention of claim 1 can be achieved by disposing the cylindrical body with the slit in the joint box and providing the engaging piece on the inner periphery of the divided piece by the slit. In particular, if the joint box is fixed to the back of the joint plate as in the third aspect of the invention, the coupling force of the male and female fittings can be transmitted to a wide range of the segment through the joint plate.

According to the invention of claim 4, as the female metal fitting,
The effect of the invention of claim 1 can be obtained by providing the leaf spring with the radial slit.

According to the invention of claim 5, as the female metal fitting,
By arranging a plurality of fasteners and elastically supporting these fasteners with the backup rubber arranged on the outer periphery thereof, the effect of the invention of claim 1 can be obtained. In particular, if the elastic washer is sandwiched between the backup rubber and the joint plate as in the sixth aspect of the invention, the elastic washer can absorb the deformation between the joints.

According to the invention of claim 7, since the joint plate is provided on the end surface of the segment on the male fitting side and the male fitting is fastened to this joint plate, the coupling force of the male and female fittings is transmitted to a wide range of the segment. be able to.

According to the invention of claim 8, since the male metal fitting is fastened to the insert metal fitting embedded in the end face of the segment,
The structure of the segment can be simplified and the cost can be reduced.

According to the invention of claim 9, the fastening position of the male metal fitting can be adjusted. Therefore, by adjusting the fastening position after the male and female metal fittings are joined together, the rattling of the joint portion can be eliminated and the joining force can be increased. Can be increased.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state before fastening according to a first embodiment of the present invention.

2A and 2B are configuration diagrams of a cylindrical body 25 in FIG. 1, where FIG. 2A is a front view and FIG. 2B is a side view.

FIG. 3 is a side sectional view showing a fastened state of the first embodiment.

FIG. 4 is a side sectional view showing a fastening state of the second embodiment of the present invention.

FIG. 5 is a side sectional view showing a state before fastening according to a third embodiment of the present invention.

6 is a front view of the leaf spring 40 of FIG.

FIG. 7 is a cross-sectional view showing a fastening state of the third embodiment.

FIG. 8 is a side sectional view showing a fastening state of a fourth embodiment of the present invention.

9 is a sectional view taken along the line IX-IX in FIG.

FIG. 10 is an enlarged view of a portion X in FIG. 8;

FIG. 11 is a side sectional view showing a fastening state of the fifth embodiment of the present invention.

FIG. 12 is a side sectional view showing a state before fastening according to a sixth embodiment of the present invention.

13A is a sectional view taken along arrow XIIIa-XIIIa in FIG. 12, and FIG. 13B is a sectional view taken along arrow XIIIb-XIIIb in FIG.

FIG. 14 is a side sectional view showing a state in the middle of fastening of the sixth embodiment.

FIG. 15 is a side sectional view showing a fastened state of the sixth embodiment.

FIG. 16 is a cross-sectional view showing a conventional joint structure.

[Explanation of symbols]

 1A, 1B segment 2A, 2B Joint plate 7 Insert hole 10 Male fitting 15 Head 16 Tapered portion 17 Constricted portion 19 Insert fitting 21 Joint box 22 Space 25 Cylindrical body (female fitting) 26 Slit 27 Split piece 27a Engagement piece (engagement) 28) Tip opening 40 Leaf spring (female metal fitting) 41 Slit 42 Split piece 43 Center hole 50 Female metal fitting 51 Stopping metal fitting 51a Engaging piece 52 Receiving hole 55 Backup rubber 60 Elastic washer

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuo Miyazawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hiroaki Inoue 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Within the corporation

Claims (9)

[Claims] 1. A joint device for abutting end faces of two segments and joining them to each other, wherein a pin-shaped male fitting projecting on an end face of one segment to be joined and an end face of the other segment are provided. And a concave female metal fitting for receiving the male metal fitting, wherein the male metal fitting has a head portion with a large diameter at its tip, a tapered portion on the front side of the head portion, and a constricted portion with a small diameter on the back side. The female metal fitting has an inlet at the time of insertion of the male metal fitting,
It has an engaging portion that is displaced outward in the radial direction by being pushed by the tapered portion, returns inward in the radial direction when the head having the large diameter passes, and is displaced to engage with the constricted portion. A segment joint device characterized by the above. 2. A joint box is provided inside the end surface of the other segment, and the female metal fitting is formed of a cylindrical body disposed in the joint box, and the cylindrical body has a tip opening at the end surface of the segment. It is exposed to the outside and the rear end is fixed to the joint box, and a plurality of slits are formed on the peripheral wall of the cylindrical body in the vertical direction from the front end. The space for allowing the outward displacement of the divided piece is secured, and an engaging piece as the engaging portion is provided on the inner circumference of the tip end portion of the divided piece. Segment fitting device. 3. The joint box is fixed behind a joint plate provided on an end surface of the segment, and a front end opening of the cylindrical body is exposed to the outside through an insertion hole provided in the joint plate. 3. The segment joint device according to claim 2. 4. A joint plate is provided on an end surface of the other segment and a joint box is provided behind the joint plate, the female metal fitting is disposed between the joint plate and the joint box, and a head of the male metal fitting. A ring-shaped leaf spring having a central hole with a diameter smaller than that of the portion, and the leaf spring has a plurality of slits whose outer peripheral portion is fixed and which extends radially from the central hole corresponding to the insertion hole of the joint plate. The divided pieces divided in the circumferential direction by the slits are such that the inner peripheral portions of the divided pieces can be bent inward from the joint plate and the bending of the joint plate in the joint plate direction is limited. 2. The segment joint device according to claim 1, wherein is the engaging portion. 5. A joint box is provided inside the end surface of the other segment, and the female metal fitting comprises a plurality of metal fittings arranged in the joint box. Each of the metal fittings is the male metal fitting. The cylindrical outer rubber is elastically supported by a cylindrical backup rubber which is arranged on the circumference so as to form the receiving hole of the fitting and is arranged between the outer circumference and the inner circumference of the joint box. 2. The segment joint device according to claim 1, wherein an engagement piece serving as the engagement portion is provided on the inner circumference. 6. The joint device for a segment according to claim 5, wherein an elastic washer is inserted between the backup rubber and the joint plate, the elastic washer allowing the displacement of the stopper to the joint plate side. . 7. The segment joint according to claim 1, wherein a base end portion of the male fitting is fastened to a joint plate fixed to an end surface of the one segment. apparatus. 8. The segment joint device according to claim 1, wherein a base end portion of the male fitting is fastened to an insert fitting embedded in an end surface of the segment. 9. The segment joint device according to claim 1, wherein the male fitting is provided so that the fastening position can be adjusted in the axial direction.