JP2000064791A - Joint structure by male-female metal fitting and segment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure, in which no operation such as the corrosionproof treatment of a joint member for a segment, etc. and internal- surface secondary lining and the like is required. SOLUTION: In the joint structure by the male-female metal fittings 4, 7 abutting and joining the mutual end faces of the segments 1 having specified wall thickness, the hooked male metal fittings 4 are installed to one abutting end face 3 in the tunnel circumferential direction of the segments 1, recessed sections 6, into which the male metal fittings 4 are fitted, are formed to the other abutting end face 5, and the female metal fittings 7 with engaging holes 8, with which the engaging front-end sections 4a of the male metal fittings 4 are engaged by moving the segments 1 in the tunnel axial direction in the recessed sections 6, are buried to the other abutting end face 5. Flexible springs 13 clamping the abutting surfaces by drawing the engaging front-end sections 4a of the male metal fittings 4 inserted into the engaging holes 8 near in the bottom direction of the recessed sections 6 are installed to the female metal fittings 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete type segment and a joint structure using male and female metal fittings used for connecting other members constituting an inner wall of a tunnel, and a segment using the joint.

[0002]

2. Description of the Related Art As a method for constructing a tunnel, a shield method is generally used in which segments are assembled on the inner surface side of excavation. The segment used for this shield construction method is conventionally
This is a connection structure that has a bolt joint, and segments adjacent to each other in the tunnel circumferential direction and the tunnel axial direction are abutted against each other and connected by bolts.

[0003]

The segment having such a conventional bolt joint has the following problems. When the secondary lining is not performed, the joint metal fittings are exposed on the inner surface of the tunnel, and anticorrosion treatment is required. In addition, it is necessary to fill the bolt box. In the case of water-related applications such as sewers, drainage canals, and drainage canals, secondary lining is performed to ensure the inner surface smoothness and the prescribed roughness coefficient. The bolt joint requires a lot of time for bolt fastening and requires a skilled worker for segment assembly.

It is an object of the present invention to provide a joint structure using male and female metal fittings, which solves the above problems, and a segment using the same.

[0005]

In order to solve the above-mentioned problems, the joint structure by the male and female metal fittings according to the present invention has a predetermined wall thickness, and the end faces of the members constituting the tunnel inner wall are abutted and joined together. It is a joint structure with male and female metal fittings,
One or both of a hook-shaped male fitting and a recess into which the male fitting of the opposing member fits are provided on the abutting surfaces of the member in the tunnel circumferential direction, and the member is moved in the tunnel axial direction within the recess. By embedding a female fitting having an engaging hole with which the engaging tip of the male fitting engages, the engaging tip of the male fitting inserted into the engaging hole is formed in the female fitting. It is characterized in that a flexible spring for tightening the abutting surface by pulling the bottom of the flexible spring is provided.

Further, another joint structure using male and female metal fittings according to the present invention has a predetermined wall thickness and joins the end faces of the members forming the inner wall of the tunnel with the abutting faces inclined with respect to the tunnel axis. In the joint structure of male and female metal fittings, one or both of a hook-shaped male metal fitting and a concave portion into which a male metal fitting of an opposing member is fitted are provided on the abutting surfaces of the member inclined in the tunnel circumferential direction. A female metal fitting having an engaging hole with which the engaging tip portion of the male fitting is engaged by moving the member in the tunnel axial direction is embedded therein, and the female fitting is inserted into the engaging hole. The present invention is characterized in that a flexible spring for tightening the abutting surface is provided by pulling the engaging tip portion of the male fitting toward the side surface of the recess.

A segment according to the present invention is a segment in which end faces of a segment having a predetermined wall thickness are butted and joined to each other by using a joint structure of male and female metal fittings. One or both of a hook-shaped male metal fitting and a concave portion into which the male metal fitting of the opposite segment fits are provided, and by moving the segment in the axial direction of the tunnel in the concave portion, the engaging tip portion of the male metal fitting. Is embedded with an engaging hole that engages with, and the female fitting is tightened at the abutting surface by pulling the engaging tip of the male fitting inserted into the engaging hole toward the bottom of the recess. A feature is that a flexible spring is provided.

Further, in another segment according to the present invention, by moving a key segment having a predetermined wall thickness in the tunnel axial direction, both abutting surfaces of the key segment inclined with respect to the axis of the tunnel are provided on both sides thereof. Which is a segment to be joined using a joint structure of male and female metal fittings, the hook-shaped male metal fitting on the abutting end face inclined with respect to the tunnel axis of the key segment, and the concave portion into which the male metal fitting of the opposite segment fits. One or both of them is provided, and by moving the key segment in the tunnel axial direction in this recess, a female metal fitting having an engaging hole with which the engaging tip end of the male metal fitting is engaged is embedded, and in the female metal fitting. Is a flexible spring that tightens the abutting surface by pulling the engaging tip of the male fitting inserted into the engaging hole toward the side surface of the recess. And wherein configuration provided.

According to the present invention, the members or the segments are butted to each other in the tunnel circumferential direction, the engaging tip of the male fitting is positioned on the center line of the engaging hole of the female fitting, and then the both members are joined. Alternatively, by moving both segments in the tunnel axial direction, the male and female metal fittings can be engaged with each other and joined at the abutting end faces, and the abutting faces can be tightened by the flexible spring. Moreover, since the male and female metal fittings are not exposed to the inner surface of the member or segment, the anticorrosion treatment is not required even if the secondary lining is not performed, and the inner surface of the member or segment can be made smooth.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a concrete segment ring 2 in which male and female metal fittings are implemented in joints between segments (that is, in the circumferential direction of the tunnel) as an embodiment of the present invention. The left side of the line shows the end face of the segment ring on the face side, and the right side of the center line shows the end face of the segment ring on the wellhead side. 2 is a vertical sectional front view showing the segment 1 alone in FIG. 1, FIG. 3 is a front view of the wellhead side of the segment 1, FIG. 4 (A) is an inside view of the segment, and FIG. 4 (B) is the same figure (A). FIG. 5C is a partially cutaway left side end view, FIG. 5C is a right side end view of FIG. 5A, and FIG.

On one end face 3 of the segment 1 in the circumferential direction of the tunnel, two (or a plurality of) hook-shaped male fittings 4 whose tips are directed in the tunnel axial direction are provided at intervals in the tunnel axial direction. A recess 6 into which the male fitting 4 can be fitted is formed on the other end surface 5, and the male fitting 4 fitted into the recess 6 is formed.
A female metal fitting 7 with which the abutting male metal fitting 4 can be engaged is provided in the concave portion 6 by slightly moving the contact metal fitting in the tunnel axis direction.

Explaining further with reference to FIG. 5 and subsequent figures, the base end of the hook-shaped male fitting 4 is embedded in the concrete-based segment 1, and the engaging tip 4a thereof is bent toward the wellhead side in the tunnel axis direction. Has been. The female metal fitting 7 is made of a steel plate having a substantially concentric shape with the engaging tip portion 4a of the male metal fitting 4 and having an engaging hole 8 having a size slightly larger than the outer dimension of the tip portion 4a. It is embedded in the segment 1 so as to partition the inside.

As described above, the concave portion 6 has the segment 1
Is formed on the other end surface 5 in the circumferential direction of the tunnel, and as shown in each drawing, the distance L between the one side surface 10 of the recess 6 and the female metal fitting 7 made of a steel plate is equal to the engaging tip portion of the hook-shaped male metal fitting 4. Four
It is provided a little longer than the length L1 of a (that is, L
> L1). Therefore, when joining the segments 1 to each other in the circumferential direction of the tunnel, the male fitting 4 is inserted into the recess 6 through the gap L between the one side surface 10 of the recess 6 and the female fitting 7 made of a steel plate, and By slightly moving the segment 1 of the male fitting 4 in the axial direction of the tunnel, the engaging tip portion 4a of the male fitting 4 can be engaged with the engaging hole 8 of the female fitting 7, whereby a tunnel between the segments is formed. Circumferential bonding can be performed.

At the rear surface of the female metal member 7 made of steel plate, that is, at both ends of the side surface opposite to the side where the male metal member 4 is inserted, one end of two reinforcing plates 11 arranged in parallel in the tunnel axis direction is welded. There is also an anchor bar 9 at the back end of the female metal fitting 7.
Are welded together, and the reinforcing plate 11 and the anchor bar 9
Is embedded in the segment integrally with the female metal fitting 7 of the flat steel plate. Further, the tip recess 6a in the recess 6, that is, the male fitting 4
The cross-sectional shape of the tip concave portion 6a located on the back side of the female metal fitting 7 on the side opposite to the insertion side is formed so as to have the same opening front shape as the conical tip of the engaging tip 4a of the male metal fitting 4. (See FIGS. 12 and 13).

Further, in the present invention, when the male fitting 4 is engaged with the female fitting 7, the abutting surfaces 12 of the adjacent segments 1 in the tunnel circumferential direction (that is, the both end surfaces 3, 5 of the segments are joined). Surface) is joined with an appropriate fastening force,
The female metal fitting 7 is provided with the flexible spring 13 shown in FIGS. 5, 6, 7, and 8 so that no gap or play is generated at the seam, and the spring tip is inside the engagement hole 8. It is provided so that it partially protrudes.

That is, the engaging hole 8 is provided in a size such that the engaging tip 4a of the male fitting 4 can be loosely fitted therein.
The engaging tip portion 4a of the male metal fitting 4 inserted into the engaging hole 8 of the female metal fitting 7 is utilized in the engaging hole 8 by utilizing the elastic force of the flexible spring 13 toward the bottom surface 6b of the concave portion 6. By pulling the end faces 3 and 5, the appropriate fastening force can be introduced so that the end faces 3 and 5 of the segment 1 in the circumferential direction of the tunnel can be joined together without any gap or play.

As the flexible spring 13, for example, FIG.
There is a material cross-section elastic spring system shown in FIG. 6, a seal spring system shown in FIG. 6, an arch spring system shown in FIG. 7, and a beam-shaped spring system shown in FIG.

The material section elastic spring system is shown in FIG.
As shown in (A) and (B), the thickness (t) of the flat steel plate forming the female fitting 7 is utilized to form a groove 14 in the hole wall of the engaging hole 8, and the groove 14 is made of rubber, A material cross-section elastic spring 13a made of a filled material such as plastic is fitted, and the spring tip is provided so as to slightly project from the hole wall of the engaging hole 8 toward the hole center. The arrangement range of the material cross-section elastic springs 13a is not the entire circumference of the hole wall, but only a part in the circumferential direction, that is, only on the end faces 3 and 5 that abut on the tunnel circumferential direction of the segment 1 (however, as shown in the drawing, However, it may be provided in a U-shaped range that is slightly extended to both sides from this, and is not provided on the opposite side of the abutting end faces 3 and 5 (that is, on the bottom face 6b side of the recess 6).

In the elastic spring section having the above-mentioned material, the peripheral surface of the tip engaging portion 4a of the male fitting 4 inserted into the engaging hole 8 of the female fitting 7 is The tip end of the material cross-section elastic spring 13a is pushed to the bottom surface 6b side of the recessed portion 6, and as a result, the end faces 3 and 5 of the segment 1 that abut in the tunnel circumferential direction are joined with an appropriate fastening force and loose or loose at the joint portion. Opening does not occur.

The seal spring system is shown in FIGS. 6 (A) and 6 (B).
As shown in FIG. 2, the spring tip portion slightly projects from the hole wall of the engaging hole 8 toward the hole center direction, and the seal spring 13b formed in an arc shape along the insertion direction of the male fitting 4 is attached to the female fitting 7. It is constructed by fixing the flat steel plate to the side surface with bolts 15. The arrangement range of the seal spring 13b is not the entire circumference of the hole wall, but is provided only in a part in the circumferential direction, that is, only on the tunnel circumferential direction abutting end face 12 side of the segment 1, and on the opposite side of the abutting end face (that is, the bottom surface of the recess 6). 6b side) is not provided. Although the seal spring 13b of this embodiment is formed in a J shape with the same plate thickness over the entire length, the plate thickness gradually decreases toward the tip in either the V shape or in both shapes. You may shape | mold in such a cross section. Further, other fixing methods such as welding and welding may be used to fix the seal spring 13b to the female fitting 7.

In the above-mentioned seal spring system, the peripheral surface of the tip end engaging portion 4a of the male fitting 4 inserted into the engaging hole 8 of the female fitting 7 has a seal spring 13b inside the engaging hole 8. Is pushed to the bottom surface 6b side of the recess 6 by the bent tip end of the concave portion 6, and as a result, the tunnel circumferential butt end surface 1 of the segment 1 is
The two parts are joined together with an appropriate fastening force, and there is no play or opening in the joint part.

The arch spring method is shown in FIGS. 7 (A) and 7 (B).
As shown in FIG. 4 (similar to the elastic spring method in cross section of the material), the thickness (t) of the flat steel plate forming the female metal fitting 7 is used, and the engaging hole 8
A groove 14 is formed along the hole wall in a predetermined range in the circumferential direction, and an arch spring 13c made of spring steel or the like having an arcuate cross section is fitted in the groove 14 and the spring top thereof is engaged. Hole 8
It is provided so as to slightly project from the hole wall of the toward the center of the hole.
The arrangement range of the arch spring 13c is not the entire circumference of the hole wall but a part in the circumferential direction, that is, the tunnel circumferential direction abutment surface 12 side of the segment 1 (however, as shown in the drawing, the front surface slightly extended to both sides from the front surface). It is provided in a U-shaped range, and is not provided on the opposite side of the abutting surface 12 (that is, the bottom surface 6b side of the recess 6).

In the above-mentioned arch spring system, the peripheral surface of the tip engaging portion 4a of the male fitting 4 inserted into the engaging hole 8 of the female fitting 7 has the arch spring 13c inside the engaging hole 8. Is pushed to the bottom surface 6b side of the recess 6 by the tip end of the concave portion 6 and, as a result, the tunnel circumferential direction butting surface 12 of the segment 1 is joined with an appropriate fastening force, and rattling or opening does not occur in the joint portion.

In the beam-shaped spring method, as shown in FIG.
As shown in (D), a steel rod (a round steel of Φ9 in the figure) having a predetermined thickness and length and a predetermined cross-sectional shape is bent so that both ends are slightly raised, and a substantially U-shaped beam-shaped spring 13d is formed. Is configured. Both rising portions 37 of the beam-shaped spring 13d are fixed by welding 38 to both side edges of the female fitting 7 having a predetermined thickness (t) on opposite sides of the male fitting in the engaging holes 8 of the female fitting 7, and the intermediate horizontal portion 39 is The spring biasing portion is not welded to the lower edge of the engaging hole 8 and is provided such that a part of the periphery of the intermediate horizontal portion 39 slightly projects from the hole wall surface of the engaging hole 8 into the hole. There is.

In the above-mentioned beam-shaped spring system, the front end engaging portion 4a of the male fitting 4 has the engaging hole 8 of the beam-shaped spring 13d made of steel rod.
The intermediate horizontal portion 39, which is slightly projecting inside, is provided with the engaging hole 8
It enters into the engagement hole 8 by pushing it out from
At this time, the tip end engaging portion 4a of the male fitting 4 has a beam-shaped spring 13d.
Is pushed to the bottom surface 6b side of the recess 6 by the reaction force of the strong elastic spring of, and as a result, the end faces 3 and 5 which are abutted in the tunnel circumferential direction of the segment 1 are made of steel rods as in the above spring systems. The beam-shaped spring 13d is joined by the fastening force due to the strong elastic force, so that the joint portion does not rattle or open.

9 to 11 show a procedure for joining the end faces 3 and 5 of the segments 1 adjacent to each other in the tunnel circumferential direction in the joint structure using the flexible spring 13 composed of the seal spring 13b. From the state of FIG. 9 to the male fitting 4 as shown in FIG.
Are fitted in the recesses 6, then the opposing segments 1 are moved in the tunnel axis direction as shown in FIG. 11, and the engaging tips 4a of the male fittings 4 are inserted into the engaging holes 8 of the female fittings 7, At this time,
The seal spring 13b causes the engaging tip portion 4a of the male fitting 4 to be recessed 6
The butting surfaces 12 of both segments 1 can be fastened by urging the bottom surface 6b of the two.

12 (A), (B), (C), and (D) are enlarged views of the elastic contact portions between the various flexible springs 13 and the engaging tips 4a of the male fittings 4, and FIG. A) shows an example of the material section elastic spring 13a. FIG. 7B shows an example in which the seal spring 13b is attached to the stepped recess 16 formed in the peripheral edge of the engagement hole 8 of the female fitting 7, and FIG. 9C shows an example of the aforementioned seal spring 13b. D) shows the above-mentioned arch spring 13c.

15 and 16 show a key segment 17 and
B segment 18,1 that is connected to it and left and right in the circumferential direction
The joint structure with 9 is shown. As shown in the figure, the key segment 17 has a substantially trapezoidal cross section in the circumferential direction in which the face side is expanded, and the male fittings 4 with the tip engaging portions 4a facing the wellhead side project from both inclined end surfaces 20 thereof. It is set up. Further, each of the inclined end faces 21 of the B segments 18 and 19 on both sides is provided with a concave portion 6 having a triangular cross section having a bottom surface 6b parallel to the tunnel axis direction, and is made of a flat steel plate and has an engagement hole 8. The female metal fitting 7 included therein is embedded in the B segments 18 and 19 so as to partition the concave portion 6 in the tunnel axial direction. Female metal fitting 7
On the rear surface (the surface opposite to the direction in which the male fitting 4 is inserted)
The reinforcing plate 11 and the anchor streak 9 having the same configuration as described above are embedded.

Therefore, in the final step of constructing one segment ring 2, as shown in FIG. 15, between the B segments 18 and 19 which are circumferentially adjacent to each other via the V-shaped space 22 having the enlarged diameter on the face side. The key segment 17 is pushed into the space 22 in the tunnel axial direction from the face side toward the wellhead side. Thereby, the male fitting 4 of the key segment 17
The engaging tip portion 4a of the key segment 1 moves in the recess 6 in the axial direction of the tunnel, engages with the engaging hole 8 of the female metal fitting 7, and the key segment 1
7 and the B segments 18 and 19 on both sides can be joined. Further, at this time, the flexible spring 13 causes the engaging tip portion 4a of the male fitting 4 engaged with the engaging hole 8 of the female fitting 7 to move to the bottom surface 6b of the recess 6.
By pressing it to the side, the inclined end faces 20 and 21 of the key segment 17 and the B segments 18 and 19 that are butted in the tunnel circumferential direction can be joined with an appropriate fastening force. The male fitting 4 and the female fitting 7 provided on the key segment 17 and the B segments 18 and 19 may be provided in an arrangement relationship opposite to that shown in the drawing. 15 and 16, the flexible spring 13 is the case where the seal spring 13b is used, but it goes without saying that the same effect can be obtained by using the spring of the other embodiment.

As shown in FIG. 17, the segment rings 2 are joined to each other in the tunnel axial direction by a plurality of engaging pins 24 provided on the side surface 23 on the tunnel axial direction wellhead side of the segment 1 and the tunnel. It is performed by engaging with a plurality of chucks 25 provided on the side face 23a on the axial face side.

Details of the chuck 25 are shown in FIG. In the figure, the tip surface of the circumferential wall 35 of the cap 34 having a bottomed tubular shape is welded to the inner surface of the end portion of the reinforcing plate 33, and the engaging recessed portion 36 is formed on the inner surface of the tip of the circumferential wall 35. The peripheral portion of the check spring 27, which is a double-placed ring-shaped spring steel plate whose center line is aligned with the pin insertion hole 26 formed in the reinforcing plate 33, is the inner surface of the reinforcing plate 33 and the pin insertion hole 26 It is arranged at the peripheral portion. Ring-shaped check spring 2
7 has a large number of cuts 29 formed in the periphery of the ring hole 28, and is formed by engraving a large number of spring pieces 30 in the circumferential direction, the ends of which are inclined toward the center of the hole. Further, by forming a gap between the peripheral edge portions of the upper and lower check springs 27 between the upper and lower spring pieces 30 via the spacer 31, the spring action of each of the upper and lower spring pieces 30 can be sufficiently exerted. It is configured. Further, the retainer 32 made of an annular plate is locked to the upper step surface of the engaging recess 36 formed on the inner surface of the circumferential wall 35 of the cap 34, and the retainer 32 presses the upper check spring 27. The check springs 27 are fixed to the openings of the cap 34.

Therefore, in constructing the inner wall of the tunnel, when the side face 23a of the new (provided) segment 1 on the tunnel face in the axial direction of the tunnel is pushed by the jack toward the existing segment ring, the new segment is connected. Engaging pin 24 projecting from the side face 23 of the No. 1 pit side
Is inserted into the chuck 25 on the side face of the existing segment 1 on the face side. At this time, the tip of each spring piece 30 of the check spring 27 is strongly engaged with the entire circumference of the engagement pin 24, and thereafter the engagement pin 24 does not slip out of the chuck 25. If the outer circumference of the engaging pin 24 is roughened or if a step portion or the like is provided, the check spring 27 engages with this to prevent the slip-out from being more perfect. In the present invention, the structures of the engagement pin 24 and the chuck 25 are not limited to those shown in the drawings, and various modifications may be made as long as the engagement pin 24 has a male fitting and the chuck 25 has a female fitting. Absent.

In the above embodiment, two sets of male fittings 4 are provided on one of the butting end faces 3 of the segment 1 with the engaging tips 4a thereof facing the wellhead side, and two sets of female fittings are provided at the other butting end face 5. Although the example in which the metal fitting 7 is provided is shown, various variations (modifications) can be considered in the arrangement provided in the abutting end surfaces 3, 5 of the male and female metal fittings 4, 7.

For example, as shown in FIGS. 19 and 20, male fittings 4 and female fittings 7 are provided on the abutting end faces 3 and 5 at both ends of the segment 1, and the abutting end faces 3 and 3 on both sides are provided.
5, the engaging tip portions 4a of the male fittings are provided so as to be turned toward the wellhead side and the face side, and correspondingly, the engaging tip ends 3 and 5 of the both ends of the segment 1 are also engaged tip ends of the male fitting 4 described above. A female metal fitting 7 with which the portion 4a is engaged is provided.

Therefore, in the example of FIG. 19, the newly installed segment 1 is moved from the left to the right in the figure, and is further moved to the wellhead side so that the female fitting 7 and the male fitting 4 of the newly installed segment 1 are connected to the male fitting of the existing segment 1. The metal fitting 4 and the female metal fitting 7 can be engaged with each other. In the example of FIG. 20, contrary to FIG. 19, by moving the new segment from the right to the left in the figure and further moving it toward the wellhead side, the female fitting 7 and the male fitting 4 of the new segment 1 are connected to the male fitting of the existing segment 1. The metal fitting 4 and the female metal fitting 7 can be engaged with each other.

In addition, the engaging tip portion 4a of the male fitting 4 is provided on one of the abutting end surfaces 3 of the segment 1 toward the face of the face, and the other abutting end surface 5 is provided with a female fitting 7 with which the male fitting 4 engages. The female fitting 7 of the newly installed segment 1 may be configured to be engaged with the female fitting 7 of the existing segment 1 by moving the female fitting 7 of the newly installed segment 1 from left to right or from right to left, and further moving to the wellhead side. (However, illustration is omitted).

Although the engaging tip portion 4a of the male fitting 4 has a tapered shape in which the ridge line portion is chamfered in the illustrated example, it may have a shape in which the shaft member is cut at a right angle to the axis line, and its engaging function is changed. There is no.

Further, the legs of the male fitting 4 are sufficiently buried in concrete, or are buried in a proper length, and the leg portions are provided with an enlarged portion, or, as shown in the figure, anchors. The muscle 9 is fixed by welding or the like. Further, the male fitting 4 can be formed by cutting or casting a steel material, or by welding it with a steel bar such as a reinforcing bar, or can be integrally formed by casting. Similarly,
The female metal member 7 can be produced by cutting, punching, welding, etc. a steel plate as shown in the present embodiment, or can be integrally cast including the anchor bar 9 to achieve the same function.

[0039]

The present invention has the following effects. The male and female metal fittings are engaged with each other, the members and the segments are joined together at the abutting end faces, and the abutting faces can be tightened by the flexible spring. Since the joint fitting for joining the members or the segments with each other so as not to cause a difference between the openings is not exposed on the inner surface of the member or the segment ring, the anticorrosion treatment is not required. In addition, since the joint fitting fits in the recess, it is not necessary to fill the holes in the conventional bolt box, and the secondary lining can be omitted. Since there is no defective portion such as a bolt box on the inner surface of the member or the segment ring, smoothness is ensured, and a required roughness coefficient can be sufficiently ensured in a tunnel such as sewer. If the members and segments are joined in the tunnel axial direction by a boltless type such as a chuck / pin type, the assembling work can be performed efficiently, which is highly economical.

[Brief description of drawings]

FIG. 1 is an end view of a segment ring according to an embodiment of the present invention, in which a left side from a center line indicates a face of a face and a right side indicates a wellhead side.

FIG. 2 is a vertical sectional view of a single segment.

FIG. 3 is a cutaway front view of a wellhead side of a segment.

4A is an inside view of the segment of FIG. 2, FIG. 4B is a left end view of FIG. 4A, and FIG. 4C is a right end view of FIG.

5A and 5B are cross-sectional views showing the engagement relationship of the male and female metal fittings according to the first example at angles different from each other by 90 °.

6A and 6B are cross-sectional views showing the engagement relationship of the male and female metal fittings according to the second example at angles different from each other by 90 °.

7A and 7B are cross-sectional views showing the engagement relationship of the male and female metal fittings according to the third example, taken at angles different from each other by 90 °.

8A and 8B are cross-sectional views showing the engagement relationship of the male and female metal fittings according to the fourth example at angles different from each other by 90 °;
(C) is a plan view of the same (B), and (D) is a perspective view of a beam-shaped spring.

FIG. 9 is a cross-sectional view showing a first step in joining the segments in the tunnel circumferential direction using the male and female metal fittings according to the second example.

10 is a sectional view showing a second step following FIG. 9. FIG.

11 is a sectional view showing a third step following FIG. 10. FIG.

FIG. 12 is an enlarged cross-sectional view showing an engagement relationship between a female metal fitting provided with the flexible spring according to the first to fourth examples and a male metal fitting engaged with the female metal fitting.

13 is an enlarged cross-sectional view of FIG. 5 (B).

14 is an enlarged cross-sectional view of FIG. 5 (B).

FIG. 15 is an enlarged sectional view showing an engagement relationship between a key segment and A and B segments on both sides thereof.

16 is an enlarged partial view showing the engagement relationship between the male and female metal fittings in FIG.

FIG. 17 is an inner view of two segments joined in the axial direction of the tunnel through the engagement pin and the chuck.

18 is an enlarged cross-sectional view of the portion (A) of FIG. 17, showing a state in which the engagement pin engages with the chuck.

FIG. 19 is an explanatory view showing another arrangement example of the male and female metal fittings provided in the segment and an engagement mode thereof.

FIG. 20 is an explanatory view showing still another arrangement example of the male and female metal fittings provided in the segment and an engagement mode thereof.

[Explanation of symbols]

1 segment 2 segment ring 3 one side 4 male fittings 4a Engagement tip 5 other end surface 6 recess 6a Tip recess 7 female hardware 8 engagement holes 9 Anchor muscle 10 One side 11 Reinforcement plate 12 Butt faces 13 Flexible spring 14 groove 15 volts 16 stepped recess 17 key segments 18 A segment 19 B segment 20 inclined end face 21 inclined end face 22 space 23 Side of pit side 23a Side of face 24 Engagement pin 25 chuck 26 pin insertion hole 27 Check spring 28 Ring hole 29 cuts 30 spring pieces 31 Spacer 32 retainer 33 Reinforcement plate 34 cap 35 Circumferential wall 36 Engagement recess 37 Rise 38 welding 39 Middle horizontal part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshikazu Kido             No. 2 Tsukutocho, Shinjuku-ku, Tokyo Co., Ltd.             Kumagai Gumi Tokyo Head Office (72) Inventor Tashiro ▲ Climbing ▼             No. 2 Tsukutocho, Shinjuku-ku, Tokyo Co., Ltd.             Kumagai Gumi Tokyo Head Office (72) Inventor Hitoshi Murata             No. 2 Tsukutocho, Shinjuku-ku, Tokyo Co., Ltd.             Kumagai Gumi Tokyo Head Office

Claims (4)

[Claims] 1. A joint structure having male and female metal fittings having a predetermined wall thickness and abutting and joining end faces of a member forming an inner wall of a tunnel, wherein a hook shape is formed on an abutting face of the member in a tunnel circumferential direction. Either one or both of the male metal fitting and the concave portion in which the male metal fitting of the opposite member fits are provided, and the engaging tip end portion of the male metal fitting is engaged by moving the member in the tunnel axial direction in the concave metal fitting. A female metal fitting having a mating engaging hole is buried, and the female metal fitting is flexible to tighten the abutting surface by pulling the engaging tip end of the male metal fitting inserted into the engaging hole to the bottom of the recess. A joint structure consisting of male and female metal fittings, which is characterized by the construction of a flexible spring. 2. A joint structure using a male and female metal fitting, which has a predetermined wall thickness and joins end faces of members constituting the inner wall of the tunnel to each other via a butting surface inclined with respect to the tunnel axis. By providing one or both of a hook-shaped male fitting and a concave portion into which the male fitting of the opposing member fits on the inclined butting surface in the tunnel circumferential direction, by moving the member in the concave portion in the axial direction of the tunnel. A female fitting having an engaging hole with which the engaging tip of the male fitting is engaged is embedded, and the engaging tip of the male fitting inserted into the engaging hole is provided on the side surface of the recess in the female fitting. A joint structure using male and female metal fittings, characterized in that a flexible spring for tightening the abutting surfaces by pulling the spring is provided. 3. A segment in which end faces of a segment having a predetermined wall thickness are butted and joined to each other by using a joint structure of male and female metal fittings, and a hook-shaped male metal fitting is provided on an abutting surface of the segment in a tunnel circumferential direction. And either or both of the recesses in which the male fittings of the opposing segments are fitted, and by engaging the engaging tip portions of the male fittings by moving the segments in the recesses in the tunnel axis direction. A female metal fitting having a fitting hole is embedded, and in the female metal fitting, a flexible spring for tightening the abutting surface by pulling the engaging tip portion of the male metal fitting inserted in the engaging hole to the bottom of the recess. A segment characterized by the structure provided. 4. A joint structure in which male and female metal fittings are provided on both sides of the abutting surfaces of the key segments inclined with respect to the tunnel axis by moving a key segment having a predetermined wall thickness in the tunnel axial direction. A hook-shaped male metal fitting and a concave portion into which the male metal fitting of the opposite segment fits are provided on the abutting end surface inclined with respect to the tunnel axis of the key segment. A female fitting having an engaging hole with which the engaging tip of the male fitting is engaged by moving the key segment in the tunnel axial direction is embedded therein, and the female fitting is inserted into the engaging hole. A segment characterized in that a flexible spring is provided to tighten the abutting surface by pulling the engaging tip of the male fitting toward the side surface of the recess.