JP2948407B2 - Segment fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an arc plate-like segment which is joined to form a cylindrical tunnel wall,
The present invention relates to a segment fitting for joining to each other.

[0002]

2. Description of the Related Art In recent tunnel construction methods, an arc-shaped segment (made of reinforced concrete or steel) is formed behind a ground while excavating the ground with a shield machine.
Are sequentially joined to construct a cylindrical tunnel wall,
The so-called shield method is becoming common.

[0003] As shown in Fig. 4, the above-mentioned segments are joined by connecting plate-like joint fittings 2 appropriately buried in the joining end faces 1a of segments (in this case, made of reinforced concrete) 1 to be joined together with bolts 3 and nuts. 4
Is generally used. On the inner surface (concave surface) side of the segment 1, a joint recess 5 for arranging the bolt 3 and the nut 4 and enabling the fastening work thereof is provided.
Are formed in advance.

[0004]

By the way, in recent years, a large-area tunnel having an inner diameter much larger than that of the conventional tunnel such as a tunnel corresponding to a large traffic volume or a tunnel combining a railway and a roadway is constructed. A need is emerging. The segments constituting the wall of such a large-section tunnel are naturally larger than those of the related art, and in particular, have a thickness several times larger.

[0005] In the case of such a large segment having a large plate thickness, the conventional joint between segments using bolts and nuts cannot be applied because of uneasiness in joining strength. There is an urgent need to develop a new joint structure that can provide joint strength, in other words, a joint fitting.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joint fitting for a segment which can join large segments having a large thickness with sufficient strength.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and is provided on an arc surface at the joint end of each segment so that the joint end surfaces of the segments are joined together. Fitted to each other, in this state, formed in a tapered shape in a plan view from one end to the other end in the axial direction of the segment, and formed in a tapered shape in a front view gradually expanding outward in the thickness direction of the segment. A first joint fitting having a mating convex portion, and a mating concave portion extending along the mating convex portion on both sides of the mating convex portion;
Each of the first fittings has a fitting groove that fits tightly with the fitting fitting portion and a fitting ridge that fits with the fitting recess. And a second joint fitting for connecting the joint fittings.

[0008]

According to the joint fittings of the present invention, the first fittings provided at the joining ends of the two segments to be joined are connected by the second fittings, thereby joining the segments together. can do. Since the two fittings are firmly connected by the wedge action, the joining strength between the segments is sufficient.
Therefore, the present invention can be effectively applied to joining of large segments for a large-section tunnel having a large plate thickness as well as ordinary segments.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a pair of arc-shaped segments (made of reinforced concrete in this case) 11 for a large-section tunnel having a predetermined thickness, which are joined to each other as end faces in the circumferential direction, in a state along their own circumferential direction. The end faces 12 are aligned,
The state which joined mutually by the joint fittings 13 and 14 concerning this invention is shown.

Each joint end face 12 in each segment 11
In one and the other, the width direction of the segment 11 (FIG. 1)
Tenons 12a and 12b are formed to extend in the front and back directions of FIG.
When these tenons 12a and 12b are fitted to each other, each segment 11 is in a state along its own circumferential direction and in the same thickness direction.

Notches are formed on the outer surface (arc surface) 11A, which is the convex surface of the joint end of each segment 11, and on the inner surface (arc surface) 11B, which is the concave surface, over the entire width of the segment 11. 11a are respectively formed.

Now, regarding the fittings 13 and 14,
In this case, the joint fitting 13 joins the outer surface 11A side at the joint end of each segment 11, and the joint fitting 14
The concave inner surface 11B side is joined. These fittings 13 and 14 differ only in whether they join the outer surface 11A side or the inner surface side 11B side of the segment 11, and have basically the same configuration. Therefore, the fitting 13 will be described below, and the fitting 14 will be described below.
The points different from the joint fitting 13 will be supplementarily described.

The joint fittings 13 (14) are connected to each segment 1
A pair of first fittings 15 buried in the notch 11a formed at the joining ends of the first fittings 1 and a second fitting 1 for connecting the first fittings 15 to each other.
6 is comprised.

As shown in FIGS. 1 and 2, the first joint fitting 15 extends from one end in the width direction (axial direction) of the segment 11 to the other end on the outer surface 11A of the joint end of the segment 11. On both sides of the base 17, the fitting protrusions 1
8 and an upright portion 19 are integrally formed, and a groove-shaped fitting concave portion 20 is formed. The plate thickness is substantially constant, and the cross section is substantially J-shaped.

The base 17 has a length direction and a width direction substantially along the width direction and the circumferential direction of the segment 11, respectively.
However, an upright portion 19 is formed on the other side. Fitting projection 18
The surface on the side of the joint end face 12 becomes a joint end face 18a of the first joint fittings 15, and this joint end face 18a is flush with the joint end face 12 of the segment 11 itself.

The joint end surface 18 of the fitting projection 18
The end 18b in the width direction on the side opposite to the side a is P in FIG.
When viewed from the direction, as shown in FIG. 2, from one end to the other end in the length direction (the width direction of the segment 11),
It is gradually spreading. That is, the width of the fitting projection 18 is formed in a tapered shape that gradually widens inward in the circumferential direction of the segment 11 from one end to the other end.

The end 18b of the fitting projection 18 is
When viewed from the Q direction in FIG. 2, as shown in FIG.
The outer surface 11A side in the thickness direction of the segment 11 (joint fitting 1
In FIG. 4, an inclined surface 18c gradually expanding toward the inner surface 11B) is formed. That is, the height (thickness) of the fitting convex portion 18 is formed in a tapered shape that gradually expands toward the outside (in the joint fitting 14) in the thickness direction of the segment 11.

Further, the fitting projection 18 is on the outer surface 11A side of the segment 11 (the inner surface 11B side of the joint fitting 14).
Is formed as a flat surface substantially along the length and width directions of the segment 11.

The upright portion 19 is formed on the inner surface of the segment 11 in the circumferential direction and on the outer surface 11A side (in the case of the joint fitting 16, the inner surface 11A).
B side), and the inclination angle is substantially along the slope 18 b of the fitting projection 18. The upright portion 19 extends obliquely with respect to the width direction of the segment 11 along the end 18 b of the fitting projection 18. The tip surface 19a of the upright portion 19 is connected to the outer surface 11A of the segment 11 (the inner surface 11A of the joint fitting 14).
It is formed so as to be flush with B).

The fitting concave portion 20 is formed between the fitting convex portion 18 and the upright portion 19.
Along the end 18b and the upright 19 of the segment 1
1 extend obliquely to the width direction. This fitting recess 20
The width of the first fitting 15 gradually increases from one end on the side where the width of the first fitting 15 is smaller toward the other end.

The first joint fittings 15 and 16 having the above-mentioned structure provided on each segment 11 are shown in FIG. 1 when the joining end faces 12 of each segment 11 are fitted together by tenons 12a and 12b. And each fitting projection 18
And the respective end surfaces 18d are flush with each other, and the respective end surfaces 18d are flush with each other.

When the first fittings 15 in this state are combined and viewed as a single unit, the fitting projection 18 is viewed from the direction P in FIG. 1 ( In a plan view), the segment 11 is formed in a tapered shape from one end to the other end in the axial direction, and when viewed from the Q direction in FIG. 2 (forward sectional view), faces outward in the thickness direction of the segment 11. It is formed in a tapered shape gradually expanding. On both sides of the fitting projection 18, groove-shaped fitting recesses 20 extending along the fitting projection 18 are formed, respectively.

Next, the second fitting 16 will be described. As shown in FIGS. 1 and 3, the fitting 16 has fitting ridges 22 integrally formed on both ends of a base 21. The fitting groove 23 is formed between the ridges 22, the thickness is substantially constant, and the length is the same as that of the first fitting 15, and has a substantially U-shaped cross section.

When viewed from the direction P in FIG. 1, the second fitting 16 gradually extends from one end to the other in the length direction and to both sides in the width direction of itself, as shown in FIG. It is formed in a tapered shape, and is formed symmetrically (in FIG. 3) with the center line at the center in the width direction as a symmetric line.

The base 21 has a substantially flat plate shape and has a tapered shape as described above. At both ends of the base 21 and on one side in the thickness direction of the base 21, fitting protrusions 22 are respectively provided. It is protruding. These fitting ridges 22 are tapered base portions 2.
By being formed at both ends in the width direction, the distance between them gradually increases from one end to the other end, and furthermore, the second joint 16 itself also extends from one end to the other end where the width of the second joint 16 is small. It is formed in a tapered shape whose width gradually increases. The fitting groove 23 is formed between the fitting ridges 22, and the fitting groove 23 is formed in a tapered shape like the base 21.

The second fitting 16 is provided with each fitting convex 2
2 closely fit into the respective fitting recesses 20 of the respective first fittings 15 fitted together as described above,
The fitting groove 23 is adapted to closely fit into the fitted fitting projections 18, whereby the first fittings 15 are connected by the second fittings 16. .

In this connection state, both end surfaces in the longitudinal direction of the second joint fittings are flush with both end surfaces in the longitudinal direction of each first joint fitting 15, and further, the outer surface of the second joint fitting 16 is provided. (Strictly speaking, the outer surface of the base 21) is formed in a slightly arcuate surface so as to be substantially flush with the outer surface 11A of the segment 11 (the inner surface 11B in the case of the joint fitting 14).

The joint fittings 13 and 14 of the present embodiment comprising the first fitting 15 and the second fitting 16 described above.
In order to join the segments 11 with each other,
With the end on the side where the width of the joint fitting 15 is smaller, the joining end faces 12 of the segments 11 are opposed to each other and are separated to some extent. This separation distance is determined by the fitting protrusion 1
The distance at which the fitting groove 23 of the end of the second joint fitting 16 on the side with the larger width is fitted to the front end of the second fitting 8.

Next, the end of the second joint fitting 16 on the wide side is opposed to the front side of each first joint fitting 15, that is, the side of the small width, and the second joint fitting 16 is connected to the segment 11. Then, the fitting groove 23 and each fitting ridge 22 are fitted into the fitting protrusion 18 and each fitting recess 20 of each of the separated first fittings 15.

Subsequently, the inner surface of the fitting groove 23 is fitted to the fitting projection 18.
While sliding on the slope 18c and the end face 18d of the second
Is pushed in. Then, in the fitting groove 23 of the second joint fitting 16, each first joint fitting 1
Since each of the fitting projections 18 of the fifth 5 is attracted to each other and receives a force, the segments 11 are moved in the circumferential direction to approach each other.

When the two end faces in the longitudinal direction of the joint fittings 15 and 16 are flush with each other, the fitting groove 23 and the fitting ridge 22 of the second fitting 16 are moved to the respective first position. The fitting fittings 18 and the fitting recesses 20 of the first fitting 15 are fitted in close contact with each other.
5 are in close contact with each other, and the second joint fitting 1
6, the first fittings 15 are firmly connected to each other by the so-called wedge action.

Thus, the segments 11 are joined together in a state where the tenon 12b of the segments 11 is closely fitted with the tenon 12b.

According to the fittings 13 and 14 of the present embodiment, the first fittings 15 are firmly connected by the wedge action by the fitting of the second fittings 16, so that the segments 11 are connected to each other. The bonding strength is sufficient. Moreover, the joint fittings 13 and 14 of the present embodiment include the segment 1
Since the stress extends over the entire width of the joining end portion and the stress is not biased to a part of the joining end portion, the joining strength is further improved.

Therefore, the present invention can be effectively applied not only to ordinary segments but also to joining of large segments for large section tunnels having a large plate thickness.

The segment 11 of this embodiment is
Although made of reinforced concrete, the present invention is applicable to segments of other materials such as steel.

[0036]

As described above, according to the segment joint fitting of the present invention, the first joints provided at the joining ends of both segments to be joined are connected by the second joint fitting. By doing so, the segments are joined together, and the joint fittings are firmly connected by a wedge action, so that the joining strength between the segments is sufficient, so that not only the normal segments but also the plate thickness is large. This has an effect that it can be effectively applied to joining large segments for a large-section tunnel.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention.

FIG. 2 is a plan view of a first joint fitting of the embodiment.

FIG. 3 is a plan view of a second joint fitting of the embodiment.

FIG. 4 is a perspective view showing an example of a conventional fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Segment 12 Joining end face 13, 14 Joint fitting 15 First joint fitting 16 Second joint fitting 18 Fitting convex part 20 Fitting concave part 22 Fitting convex ridge 23 Fitting groove

Claims (1)

(57) [Claims] 1. A joint fitting for a segment for joining a pair of arc-shaped segments to be joined in a state where the pair of arc-shaped segments are arranged along the circumferential direction and joining the joining end surfaces, which are circumferential end surfaces, to each other. Each segment is provided on an arc surface at the joint end, and the segments are joined to each other when joined to each other, and in this state, the segment has a tapered shape from one end in the axial direction to the other end in the axial direction. And a fitting projection formed in a tapered shape in a front view gradually expanding outward in the thickness direction of the segment, and on both sides of the fitting projection, along the fitting projection. A first joint fitting having an extending fitting recess, and a fitting groove of the first fitting that closely fits to each of the joined fitting protrusions;
And a second fitting for connecting the first fittings to each other, the fitting fitting having a segment.