JP3345167B2 - Closed structure of joint recess in concrete segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a plurality of joints are connected to form a tunnel wall, and a joint recess for bolt connection formed on the inner surface of the joint is closed to finish the inner surface of the tunnel smoothly. About.

[0002]

2. Description of the Related Art In general, a so-called shield construction method for constructing a tunnel is generally performed by assembling a cylindrical wall body by mounting a number of arc-shaped segments on a peripheral wall having a substantially circular cross section obtained by excavating the ground by a shield machine. This is a method in which this is used as a primary lining, and a secondary lining or the like is performed on the inner surface of the primary lining to perform secondary lining.

FIG. 4 shows an example of a conventional RC (reinforced concrete) segment 1. This segment 1 is formed of reinforced concrete into an arc plate shape, and has a segment body 4 having an outer surface 2 and an inner surface 3 which are curved.
A plate-shaped joint fitting (joint member) 7 having a bolt insertion hole 6 at the center is embedded on the inner surface 3 side of each joint end face 5 along the width direction (axial direction) and the length direction (circumferential direction). A joint recess 8 for bolt connection is formed in the segment body 4 at a portion inside the joint fitting 7. Then, as shown in FIG. 5, the bolts 9 are passed through the joint recesses 8 of one segment 1 into the bolt insertion holes 6 where the joining end faces 5 are aligned and coincident with each other, and the nut 10 is inserted through the other joint recess 8. Is screwed to the bolt 9 and the joint fittings 7 are fastened to connect the segments 1 to each other.

[0004] By the way, in the shield method, secondary lining is performed by performing secondary winding with concrete or the like after the primary lining. In recent years, however, the appearance of concrete segments having good corrosion resistance and the improvement of economic efficiency have been improved. In view of this, it has been desired to obtain the tunnel peripheral wall only with the primary lining without performing the secondary lining.

When only the primary lining is used as described above, in the segment 1 shown in FIGS. 4 and 5, the appearance is improved, the rust prevention of the joint fitting 7, the bolt 9, the nut 10, etc. For the purpose of improving the strength of 1 itself, a joint material such as mortar is buried in the joint recess 8 and its surface is made flush with the inner surface 3 of the segment body 4. When filling the joint recess 8 with a binding material such as mortar, the joint recess 8 is closed with a plate or the like, and then the binding material is injected from a hole formed in the plate, and the plate is removed after curing. Is considered.

[0006]

The joint recess 8 is formed by the above method.
It is easily assumed that the method of closing the flat surface is complicated and time-consuming, and furthermore, there is a problem that the hardened consolidated material may fall from the joint recess 8.

The present invention has been made in view of the above circumstances, and has a structure in which a joint recess in a concrete segment can be closed easily and in a short time and a filler does not drop in a concrete segment. It is intended to provide.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and has an engagement portion formed on an inner surface facing a joint recess of a pair of joint members to be fastened. An elastic engaging member of a closing lid comprising a plate-shaped lid main body and an elastic engaging member provided on the back surface of the lid main body and elastically engaging with the engaging portion is engaged with the engaging portion. In this state, the surface of the lid main body is substantially flush with the inner surface of the segment.

An elastic piece which is elastically deformed by slidingly contacting the elastic engaging member of the closing lid with the joint member in the process of moving the lid main body in the joint concave direction, and the lid main body being fitted into the joint concave portion. And an engagement piece that engages with the engagement portion by a return operation of the elastic piece at the time of the combination.

[0010]

According to the present invention, when the elastic engaging member of the closing lid is elastically engaged with the engaging portion of the joint member, the lid body closes the joint recess flush with the inner surface of the segment. The work of closing the joint recess is completed easily and in a short time, and the closing lid is engaged with the joint member and does not come off. Therefore, there is no possibility that the solidified material such as mortar filled in the joint recess will fall.

The elastic piece which is elastically deformed by slidingly contacting the elastic engaging member of the closing lid with the joint member in the process of moving the lid body in the joint concave direction, and the lid main body fitted into the joint concave portion. When the elastic piece is provided with an engaging piece that engages with the engaging portion by a return operation of the elastic piece at a point in time, the closing lid is pressed against the joint member of the elastic engaging member by one operation of pressing the closing lid in the joint recess direction. And the lid body closes the joint recess.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which concrete segments 1 are connected to each other by the structure of one embodiment.
The same components as those in FIG. 5 are denoted by the same reference numerals, and the description will be simplified. An engagement groove 11 extending in the width direction of the segment 1 is formed on the inner surface of the joint fitting 7 facing the joint recess 8 on the inner surface 3 side of the bolt insertion hole 6 in this case. A counterbore 12 extending in the opening direction is formed at the periphery of the opening of the joint recess 8 in the segment body 4.

Reference numeral 20 denotes a closing lid.
As shown in FIG. 2, the cover body 21 includes a lid body 21 and a spring hook (elastic engagement member) 22 provided on the back surface of the lid body 21. The lid main body 21 is formed in a rectangular shape to exactly close the openings of the pair of joint recesses 8 adjacent to each other by joining the segments 1, and has a counterbore 12 around the periphery.
Is formed. The lid body 21
It is preferable to be made of a material having high corrosion resistance such as fiber concrete. A pair of recesses 24 are formed in the center of the back surface of the lid main body 21 in a line in the length direction.
The spring hook 22 is fixed to the fixing portion 25. A mortar inlet 26 is formed near both ends of the lid body 21.

The spring hook 22 has a base portion 30 extending in the length direction of the lid body 21, an arm portion 31 extending orthogonally from both ends of the base portion 30, and a tip portion 32 bent inward from the tip of the arm portion 31 to have elasticity. It has a substantially C-shape integrally formed of a leaf spring material and has an elastic piece as a whole, so that an elastic deformation occurs in which the distal end portion 32 moves away or approaches. The base portion 30 of the spring hook 22 is housed in the concave portion 24 of the lid body 21 so as to be elastically deformable, and the center of the base portion 30 is buried in the fixing portion 25 in a flush state. That is, the concave portion 24 is set to such a size that the spring hook 22 allows elastic deformation.

The closing lid 20 having the above-described structure is provided with a spring hook 22.
Are engaged with the engagement grooves 11 of the joint fittings 7, and the arm 31 abuts against the inner surface of the joint fitting 7. In this state,
The tapered surface 23 of the lid body 21 is aligned with the counterbore 12,
Its surface is flush with the inner surface 3 of the segment 1 and closes the openings of both joint recesses 8. Then, after both joint recesses 8 are closed by one closing lid 20 in this manner,
Each joint recess 8 is filled with a mortar (consolidating material) M from a mortar inlet 26. The filling of the mortar M is as required, and if not necessary, the mortar inlet 26 is not formed in the lid body 21.

In order to close both joint recesses 8 with the closing lid 20 as described above, the joint fittings 7 are fastened with bolts 9 and nuts 10 as shown in FIGS. After that, both ends 32 of the spring hook 22 are connected to the joint fitting 7.
Then, the closing lid 20 is pressed against the joint recess 8 from that state. Then, the distal end portion 32 is elastically deformed and expanded as it is pushed by the joint fitting 7, and the closing lid 20 can be moved to the joint recess 8 side. During the movement, the distal end 32 slides on the inner surface of the joint fitting 7, and the distal end 32 fits into the engagement groove 11, and at the same time, the lid body 21 closes the joint recess 8. A notch 13 is formed in the center of the end on the inner surface 3 side of the joint fitting 7 as a recess for accommodating the closing lid 20.

According to the structure for closing the joint recess 8 of this embodiment, the closing lid 20 is pressed in the direction of the joint recess 8 so that the tip 32 of the spring hook 22 engages with the engaging groove 11 of the fitting 7. With such a simple operation, the joint recesses 8 of both the connected segments 1 can be collectively closed by the closing lid 20. That is, the work of closing the joint recess 8 can be performed easily and in a short time. Further, in the closing lid 20, the spring hook 22 is elastically engaged with the engagement groove 11 of the fitting 7, so that there is no possibility that the mortar M filled in the fitting recess 8 falls.

[0018]

As described above, according to the structure for closing the joint recess in the concrete segment of the present invention, the engagement portions are formed on the inner surfaces of the pair of joint members to be fastened facing the joint recess. , A plate-shaped lid main body, an elastic engagement member provided on the back surface of the lid main body and elastically engaged with the engagement portion, and the elastic engagement member of the closing lid is engaged with the engagement portion,
In this state, the surface of the lid body is made substantially flush with the inner surface of the segment, and the closing operation of the joint recess is completed easily and in a short time, and the closing lid is engaged with the joint member. Since it does not come off, there is no danger that the solidified material such as mortar filled in the joint recess will fall. In addition, the elastic piece which is elastically deformed by slidingly contacting the elastic member of the closing lid with the joint member in the process of moving the lid body in the joint recess direction, and the time when the lid body is fitted into the joint recess. And the engagement piece engaged with the engagement portion by the return operation of the elastic piece, the elastic engagement member is pressed against the joint member by one operation of pressing the closing lid in the joint recess direction. Engagement and closure of the joint recess by the lid body are facilitated, facilitating work.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a plan view of a closing lid.

3A and 3B are side views showing a procedure for closing a joint recess with a closing lid, where FIG. 3A is an initial stage, FIG.
(C) is an end state.

FIG. 4 is a perspective view showing a general example of a concrete segment.

FIG. 5 is a side sectional view of a joint portion of the segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete segment 3 Segment inner surface 4 Segment main body 5 Joining end face 7 Joint fitting (Joint member) 8 Joint recess 9 Bolt 11 Engagement groove 20 Closure lid 21 Lid main body 22 Spring hook (elastic engagement member) 26 Mortar injection port 30 Base 31 Arm 32 Tip M Mortar

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (3)

(57) [Claims] 1. A joint member embedded in a joint end face of a concrete segment to be joined is joined together,
After fastening these joint members with bolts penetrating from both of the joint recesses formed on the inside of both joint members to each joint member, each joint recess is replaced with a segment in which the joint recess is formed. A plate-like lid body, wherein the engagement portion is formed on each of inner surfaces of the pair of joint members to be fastened, the inner surfaces facing the joint recesses; A closing lid provided on the back surface of the cover body and having an elastic engaging member elastically engaging with the engaging portion, the elastic engaging member being engaged with the engaging portion; A closure structure for a joint recess in a concrete segment, wherein a lid body is fitted into both joint recesses in a state substantially flush with the inner surface of the segment. 2. A joint member embedded in a joint end face of a concrete segment to be joined is combined with each other,
After fastening these joint members with bolts penetrating from both of the joint recesses formed on the inside of both joint members to each joint member, each joint recess is replaced with a segment in which the joint recess is formed. A plate-like lid body, wherein the engagement portion is formed on each of inner surfaces of the pair of joint members to be fastened, the inner surfaces facing the joint recesses; A closing lid provided on the back surface of the cover body and having an elastic engaging member elastically engaging with the engaging portion, the elastic engaging member being engaged with the engaging portion; The joint recess in the concrete segment, wherein the lid main body is fitted into both the joint recesses in a state of being substantially flush with the inner surface of the segment, and the joint recess is filled with a solidifying material such as mortar. Closed structure. 3. The elastic engagement member of the closing lid is elastically deformed by slidingly contacting the joint member in a closing operation of moving the lid body in the joint concave direction, and the lid is elastically deformed. The joint recess in the concrete segment according to claim 1 or 2, further comprising an elastic piece that engages with the engaging portion by an elastic return operation when the main body is fitted into the joint recess. Closed structure.