JPH11336488A - Segment joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a segment joint structure wherein when a cylindrical structure for underground river or the like is assembled from a plurality of arcuate segments, in a joint structure wherein end surfaces of adjoining segments are brought into abutting engagement with each other and joined, loads from inner peripheries can be born without making the shape of segments complicated. SOLUTION: A plurality of forwardly protruding tenons 12B, 12A, 12A, 12B are provided on the front end surface 11 of each segment 10 so as to be spaced apart from one another in lateral directions, while recessed tenons are provided on the rear end surface 13 in opposition to the protruding tenons. The rear end surface 13 of one of the segments 10 is brought into abutting engagement with the front end surfaces 11, 11 of two segments 10, 10 adjacent to the rear end surface 13 of the of segment 10 on staggered patterns, and the front end surface 11 of the segment 10 is brought into abutting engagement with rear end surfaces 13, 13 of two adjoining segments 10, 10 disposed forward of the surface 11 of the segment 10 in staggered patterns so that protruding tenons 12B, 12A, 12A, 12B are mated with recessed tenons respectively to prevent relative movement of the segments 10, 10... in the circumferential and radial directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for constructing a cylindrical structure such as an underground river or a storage pipe by assembling a plurality of arc-shaped segments into a cylindrical shape. The present invention relates to a segment joining structure to be joined.

[0002]

2. Description of the Related Art When a cylindrical structure such as a tunnel or an underground river is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape by a shield method, adjacent segments are joined to each other by abutting their mutual end faces. The joint plates on the end faces are fastened and joined to each other via bolts and nuts, or by fitting a horizontally elongated groove-shaped tenon and a horizontally protruding convex tenon on the end face, They are joined using bolts and nuts.

[0003]

In a cylindrical structure which receives a load (external pressure) from an outer peripheral side such as a tunnel, a plurality of segments assembled in a cylindrical shape generate axial compressive force in a circumferential direction, so that the segments are joined. Stability is improved. On the other hand, in a cylindrical structure that receives a load (internal pressure) also from the inner peripheral side such as an underground river or a storage pipe, the axial compressive force in the circumferential direction due to external pressure decreases, or the axial tensile force in the circumferential direction decreases. Therefore, particularly in a joint structure in which a concave tenon and a convex tenon are fitted and joined to each other, there is a problem that the joining stability of the segments is reduced.

[0004] In order to prevent such a decrease in the stability of the joints of the segments subjected to the internal pressure, for example, Japanese Patent Application Laid-Open No. 7-2 is disclosed.
In the segment joining structure disclosed in Japanese Patent No. 6893,
A hook-like projection is provided at the end of a segment, the hook-like projections at the ends of adjacent segments are abutted, and the two hook-like projections are connected by a substantially C-shaped connector so as to oppose internal pressure. However, in this case, there was a concern that the shape of the segment would be complicated and the assembling work would be complicated.

The present invention has been made in view of the above problems, and when a cylindrical structure such as an underground river or a storage pipe is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape, adjacent segments are butted with end faces. It is an object of the present invention to provide a joining structure in which a convex portion and a concave portion are fitted to each other and joined together without complicating the shape of the segments and capable of withstanding internal pressure.

[0006]

A feature of the present invention is that when a cylindrical structure such as an underground river or a storage pipe is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape, the adjacent segments are formed. In the segment joining structure in which the end faces are joined to each other, a plurality of engaging projections are provided on one of the front and rear end faces of each of the segments so as to protrude forward or rearward with an interval in the lateral direction, and to engage with the other, A concave portion corresponding to the meshing convex portion, and a rear end surface of one of the segments is strung across the front end surfaces of two adjacent segments behind the segment, and is engaged with the meshing convex portion. The front end face of one segment is straddled over the rear end faces of two adjacent segments in front of the segment, and the meshing projection and the meshing recess are engaged with each other. Recess It is engaged, in that the segments relative movement in the circumferential direction and radially joined by constraining each other.

It is preferable that the engaging projection is formed of a horizontally long projection-shaped tenon, and the engagement recess is preferably formed of a horizontally elongated groove-shaped tenon. Also, on one of the front and rear end surfaces of each segment, a horizontally protruding first-stage convex tenon that is continuous in the horizontal direction is provided to protrude forward or rearward, and on the other side, a horizontally-long continuous groove-shaped first tenon is formed. The step concave tenon is recessed corresponding to the first step tenon, and the engagement protrusion is configured with a second step tenon that is projected forward or rearward on the first step tenon. It is preferable that the recess has a second-stage concave tenon which is provided in the first-stage concave tenon corresponding to the second-stage convex tenon.

[0008]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a front perspective view of a segment 10, FIG. 2 is a rear perspective view, and FIG. 1 and 2 are assembled into a cylindrical shape on the front side, FIG. 4 is an exploded plan view, and FIG. 5 is a front and rear end joining portion of the segments 10 and 10 in FIG. It is an expanded longitudinal sectional view.

As shown in FIGS.
Is made of concrete and has an arc-shaped cross section. As shown in FIGS. 3 and 4, behind the shield machine,
A large number of segments 10, 10,...
Are joined in the front-rear direction L (direction corresponding to the longitudinal direction of the cylindrical structure), and the side end surfaces 15 and 16 are joined together by butting in the lateral direction C (the direction corresponding to the circumferential direction of the cylindrical structure). And constitute a cylindrical structure such as an underground river or a storage pipe.

As shown in FIG. 1, a front end face 11 (an end face facing the face) of the segment 10 has four horizontally long portions at a central portion in a thickness direction R (a direction corresponding to a radial direction of the cylindrical structure). The protruding convex tenon 12B, 12A, 12A, 12B
They are arranged side by side at intervals in the horizontal direction C so as to protrude forward. Then, as shown in FIG. 2, three lateral grooves or concave mortises 14 </ b> A, 14 are provided on the rear end surface 13 (the end surface facing the wellhead) of the segment 10 in the central portion in the thickness direction R, as shown in FIG. 2.
B and 14A are recessed side by side at intervals in the horizontal direction C.

Incidentally, a convex tenon 12 near the center of the front end face 11 is provided.
A and 12A are formed relatively short in the horizontal direction C, and the protruding tenons 12B and 12B at both ends are formed relatively long in the horizontal direction C. And the concave tenon 1 on both sides of the rear end face 13
4A and 14A are formed to be relatively short in the lateral direction C corresponding to the convex tenons 12A and 12A, and the concave tenon 14 at the center is formed.
B is formed to be relatively long in the horizontal direction C, corresponding to the convex tenons 12B, 12B. Also, the end face 1 of the segment
A packing groove 18 in which a rubber packing is mounted is provided in an annular shape in a portion near the outer peripheral surface of each of 1, 13, 15, and 16.

As shown in FIGS. 3 to 5, when a large number of segments 10, 10... Are assembled in a cylindrical shape, the rear end face 13 of one segment 10 has two segments 10, 10 adjoining rearward. Of the one segment 10
1 is a rear end face 13, 1 of two forwardly adjacent segments
3 and straddled. The side end faces 15, 16 of one segment 10 abut against the side end faces 16, 15 of one segment 10.

The rear end face 1 of one segment 10
3 mortises 14A, 14A and two rearwardly adjacent segments 10, 10, the front end faces 11, 11 of the convex mortise 12
A, 12A are engaged with each other, and further, the concave tenon 14B of the rear end face 13 of one segment 10 and the convex tenon 12B, 12B of the front end faces 11, 11 of two segments 10, 10 adjacent to the rear thereof are engaged with each other. ing.

The front end face 11 of one segment 10
Mortises 12A, 12A and two rearwardly adjoining segments 10, 10 of the rear end faces 13, 13 adjacent to the front thereof.
A, 14A are engaged, and one segment 1
0, the front tenon 11 of the front end face 11 and the rear end faces 13, 13 of the two segments 10, 10 adjacent in front thereof.
Are engaged with the concave tenons 14B, 14B.

(Segment rings) on the front side and the segments 10, 10,... On the rear side, which are assembled in a cylindrical shape, have a circumferential direction (lateral direction C) and a radial direction (thickness direction R). ) Are joined so as to restrict the relative movement to each other, and even if a load (internal pressure) is received from the inner peripheral side, the internal pressure can be suitably countered. In addition, since the shape and the like of the segment 10 are simplified as compared with the case where a connecting tool or the like is provided at the end of the segment, the segment 1
0 can be reduced, and the assembling work can be easily performed.

A packing mounted in a packing groove 18 is sandwiched between the end faces 11, 13, 15, 16 of the segments 10, 10,... It is supposed to be.

FIGS. 6 to 10 show a second embodiment of the present invention. FIG. 6 is a front perspective view of the segment 10, and FIGS.
Is a rear perspective view, FIG. 8 is a front perspective view of a state where the segments 10, 10... Of FIGS. 6 and 7 are assembled in a cylindrical shape, FIG. 9 is a developed plan view, and FIG. It is an expanded longitudinal cross-sectional view of the front and rear end joining part of the middle segments 10,10. The description of the same parts as in the first embodiment is omitted, and the same reference numerals are used.

As shown in FIG. 6, the front end face 11 of the segment 10 has a first protruding portion in the form of a horizontally long projection continuous from the side end face 15 to the side end face 16 in the horizontal direction C at the center in the thickness direction R. A tenon 22A protrudes forward. And, at both end portions of the first step tenon 22A, horizontally long groove-shaped second step tenons 22B, 22B are provided so as to protrude forward at intervals in the horizontal direction.

As shown in FIG. 7, the rear end face 13 of the segment 10 has a horizontally elongated groove-shaped first part extending in the lateral direction C from the side end face 15 to the side end face 17 at the center in the thickness direction R. A stepped tenon 24A is recessed corresponding to the first step tenon 22A. In the center of the first-stage concave tenon 24A, a second-stage concave tenon 22B is formed.
It is recessed corresponding to 22B.

As shown in FIGS. 8 to 10, when a large number of segments 10, 10,... Are assembled in a cylindrical shape, a first stepped tenon 24A on the rear end face 13 of one segment 10 and a rear portion thereof. Two adjacent segments 10,
10 front end faces 11, first-stage convex tenon 22A, 22A of 11
And the second stepped tenon 24B of the rear end face 13 of one segment 10 and the second step tenon 22B, 22B of the front end faces 11, 11 of two segments 10, 10 adjacent to the rear. Are engaged.

The front end face 11 of one segment 10
First tenon mortise 22A, 22A and two adjacent
The first stepped tenons 24A, 24A of the rear end faces 13, 13 of the two segments 10, 10 are engaged with each other, and the second step tenons 22B, 22B, 2
2B and two segments 10, 10 adjacent to the front thereof
And the second-step concave tenons 24B, 24B of the rear end surfaces 13, 13 are engaged with each other.

(Segment ring) on the front side and the segments 10, 10,... On the rear side, which are assembled in a cylindrical shape, have a circumferential direction (lateral direction C) and a radial direction (thickness direction R). ) Are joined so as to restrict the relative movement to each other, and even if a load (internal pressure) is received from the inner peripheral side, the internal pressure can be suitably countered. In addition, since the shape and the like of the segment 10 are simplified as compared with the case where a connecting tool or the like is provided at the end of the segment, the segment 1
0 can be reduced, and the assembling work can be easily performed.

In the above-described embodiment, a meshing projection formed of a convex tenon or a second step tenon is provided on the front end face of the segment, and a concave tenon or second step tenon is provided on the rear end face of the segment. Although the description has been given of the case where the engaging concave portion is provided, the engaging concave portion may be provided on the front end surface of the segment, and the engaging convex portion may be provided on the rear end surface of the segment.

[0024]

According to the present invention, when a cylindrical structure such as an underground river or a storage pipe is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape, adjacent segments are joined by butt end faces. In the segment joining structure, on one of the front and rear end surfaces of each segment, a plurality of meshing projections are provided in a front or rear direction with a space therebetween in the lateral direction, and on the other side,
The meshing concave portion is recessed corresponding to the meshing convex portion, and the rear end surface of one segment straddles the front end surfaces of two segments adjacent to the rear thereof and abuts each other, and the meshing convex portion is meshed with the meshing convex portion. The front end face of one segment is strung across the rear end faces of two adjacent segments in front of the segment, and the projection for engagement and the recess for engagement are engaged, so that the segment is rotated. By joining to restrict the relative movement in the direction and the radial direction to each other, it is possible to appropriately oppose the load from the inner peripheral side, and to reduce the manufacturing cost by making the shape of the segment relatively simple. And
Assembly work can be facilitated.

[Brief description of the drawings]

FIG. 1 is a front perspective view of a segment according to a first embodiment of the present invention.

FIG. 2 is a rear perspective view of the segment of FIG. 1;

FIG. 3 is a front perspective view of a state where the segments of FIGS. 1 and 2 are assembled into a cylindrical shape.

FIG. 4 is a developed plan view of FIG. 3;

FIG. 5 is an enlarged vertical sectional view of a joining portion between front and rear ends of a segment in FIG. 4;

FIG. 6 is a front perspective view of a segment according to a second embodiment of the present invention.

FIG. 7 is a rear perspective view of the segment of FIG. 6;

FIG. 8 is a front perspective view of a state where the segments of FIGS. 6 and 7 are assembled into a cylindrical shape.

9 is a developed plan view of FIG.

FIG. 10 is an enlarged vertical sectional view of a joining portion of front and rear ends of a segment in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Segment 11 Front end face 12A, 12B Convex tenon (protrusion for engagement) 13 Rear end face 14A, 14B Concave tenon (recess for engagement) 15, 16 Side end face 18 Packing groove 22A First step tenon 22B Second step tenon ( 24A First-stage concave tenon 24B Second-stage concave tenon (recess for engagement)

Claims (3)

[Claims] [Claim 1] A cylindrical structure such as an underground river or a storage pipe,
In the case of assembling a plurality of arc-shaped segments into a cylindrical shape, in a segment joining structure in which adjacent segments are joined by abutting end faces, one of the front and rear end faces of each of the segments has a plurality of engagement protrusions. The part is protruded forward or backward with an interval in the horizontal direction,
On the other hand, a concave portion for meshing is provided corresponding to the convex portion for meshing, and a rear end surface of one of the segments is strung across the front end surfaces of two adjacent segments behind the segment, The meshing convex portion and the meshing concave portion are meshed with each other, and the front end surface of one segment straddles and straddles the rear end surfaces of two segments adjacent in front of the segment, and the meshing convex portion is engaged. A segment joining structure, wherein the segment and the engaging concave portion are engaged with each other, and the segments are joined by mutually restraining relative movement in the circumferential direction and the radial direction. 2. The segment joining structure according to claim 1, wherein the engaging projection is formed by a horizontally long protrusion-shaped tenon, and the engagement recess is formed by a horizontally long groove-shaped tenon. 3. A first projecting tenon in the form of a horizontally elongated protrusion is formed on one of the front and rear end faces of each segment in the front or rear direction, and the other is formed in a horizontally elongated groove in the other direction. The first-stage concave tenon is provided to correspond to the first-stage convex tenon, and the engagement convex portion is constituted by a second-stage convex tenon that is provided forward or rearward on the first-stage convex tenon. The segment joining structure according to claim 1, wherein the engagement concave portion includes a second-step concave tenon provided in the first-step concave tenon corresponding to the second-step convex tenon.