JP2002088788A - Installation method for curved slab for arch tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method for a curved slab for an arch tunnel, bringing about good workability and enabling secure installation. SOLUTION: The adopted installation method is as follows: the lower end of the curved slab 1 for the arch tunnel is installed on a foundation 2 for the purpose of allowing both recesses 1b and 2b formed in respective joining surfaces 2a and 1c to overlap each other and form a recess space 10; and after that, concrete c is poured into the recess space 10 so as to be cured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a PCT version (precast tunnel version) used for construction of an arch tunnel.
And the like.

[0002]

2. Description of the Related Art FIG. 5 shows an example of an arch tunnel formed by an open-cutting method. In this tunnel, a pair of left and right curved plates 11, 11 are fixed to the foundation 12 at their lower portions, and the upper joint surface 11a provided with the bolt box 13 is joined to each other with bolts and nuts, and is installed in an arch shape. Next to the curved plate 11 after the installation, the next curved plate 11 is installed in the same manner as described above, and the side joining surfaces 11g along the bending direction are joined to each other with bolts and nuts, thereby sequentially connecting in the longitudinal direction of the tunnel. Has been built. Although a bolt box is also provided on the side joint surface 11g, it is omitted in the figure.

[0003]

In the construction of the conventional arch tunnel described above, the installation of the curved plates 11,... On the foundation 12 can be performed easily and firmly from the viewpoint of shortening the construction period. An installation method was desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a curved plate installation method for an arch tunnel which has good workability and can be firmly installed.

[0005]

The present invention employs the following means to achieve the above object. In other words, the method for installing a curved plate for an arch tunnel according to the first aspect is a method of mounting and fixing a pair of left and right arch tunnel curved plates forming an arch by joining upper joining surfaces to each other on a pair of left and right foundations. By installing the lower end portion of the curved plate for the arch tunnel on the foundation to form a recess space by overlapping the two recesses formed on each of these joint surfaces, concrete in the recess space Or the like, and the curing fluid is poured to cure the curing fluid.

According to the method for installing a curved plate for an arch tunnel according to the first aspect of the present invention, the curved plate for an arch tunnel is installed on a foundation such that bolts are fixed on the foundation so that the two concave portions coincide with each other, and then formed between the two. The uneven fitting portion can be formed between the foundation and the curved plate for the arch tunnel by a relatively easy method of merely injecting and hardening the hardening fluid into the recessed space.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the method for installing a curved plate for an arch tunnel according to the present invention will be described below with reference to the drawings, but it is needless to say that the present invention is not limited to this. is there. Since the present invention has a feature in the method of installing the lower end portion of the curved plate for an arch tunnel, in particular, as compared with the related art, the following description will focus on this feature. FIG. 1 is a longitudinal sectional view of a main part showing an installation structure of an arch tunnel curved plate constructed by the arch tunnel curved plate installation method of the present embodiment. FIG. 2 is a perspective view of a main part of the lower end portion of the curved plate for the arch tunnel viewed obliquely from below. FIGS. 3 and 4 show modifications of the embodiment, and FIGS.
It is an enlarged view corresponding to A section of FIG.

The curved plate 1 for an arch tunnel is a curved plate having a pair of right and left upper joining surfaces joined to each other to form an arch, and is fixed on a pair of left and right foundations 2 respectively. . Each of the lower ends of the arch tunnel curved plate 1 has an inverted T-shaped horizontal plate portion 1a as viewed from the line of sight shown in FIG. The plate portion 1 is formed integrally over the entire length in the width direction.

Furthermore, when viewed from the thickness direction of the curved plate 1 for an arch tunnel (that is, when viewed from the line of sight in FIG. 1).
And an inverted trapezoidal concave portion 1b tapering upward.
Are formed on the joint surface 1c. As shown in FIG. 2, the concave portion 1b is formed over the entire length of the curved plate 1 for arch tunnel in the width direction. Further, at two positions in the longitudinal direction of the concave portion 1b, a pair of through holes 1d, 1d are respectively provided at positions (ie, the horizontal plate portions 1a, 1a) sandwiching the concave portion 1b from the left and right (that is, a total of four positions). It is formed toward.

The side surface of one horizontal plate portion 1a (outside the arch tunnel constructed in this embodiment) and the concave portion 1b
, A supply flow path 1e for pouring the concrete c and a return flow path 1f for leading out the concrete c flowing outward from the concave portion 1b are formed through. The supply flow path 1e is a through hole provided at one location substantially at the center of the horizontal plate 1a in the longitudinal direction, but is not limited to one location and may be provided at a plurality of locations. Return channel 1
f is a through-hole that is horizontally arranged at three positions higher than the supply flow path 1e, but is not limited to three, and
Or four or more locations. However, the installation height in the concave portion 1b must be higher than the supply flow path 1e and must be formed so as to communicate with the top of the concave portion 1b. In addition, the curved plate 1 for arch tunnels is a curved plate made of reinforced concrete, or a curved plate made of steel filled with concrete in which a steel shell is filled with concrete.

The foundation 2 is laid with concrete, and the joint surface 2a is formed with a concave portion 2b which is a long groove along the extending direction of the arch tunnel to be constructed. The concave portion 2b has an inverted trapezoidal shape that tapers downward when viewed from a cross section perpendicular to its extending direction (that is, when viewed from the line of sight of FIG. 1). By overlapping with the concave portion 1b of the plate 1, a concave space 10 having a hexagonal column shape is formed. Further, a pair of bolts 3, 3 are installed and fixed in a position sandwiching the recess 2b from the left and right in a vertical direction.
A large number of these bolts 3, 3 are arranged at regular intervals in the extending direction, and are arranged such that, when the curved plate 1 for arch tunnel is installed, they can pass through the through holes 1d, 1d, respectively. Have been.

According to the arch tunnel curved plate installation method of the present embodiment, the arch tunnel curved plate 1 is installed on the foundation 2 as follows. That is, after lowering the arched tunnel curved plate 1 from above on the foundation 2 so that the bolts 3,... Of the foundation 2 fit into the through holes 1d,. To conclude. Then
The concave portion 1b naturally overlaps with the concave portion 2b to form a hexagonal prism-shaped concave portion space 10. After that, the concave space 10
Concrete c (hardening fluid) is poured into the inside through the supply flow path 1e. Concrete c poured
Gradually fills the interior of the concave space 10 and finally flows out of the return channels 1f,. By confirming the concrete c that has flowed out in this way, the worker performing the installation operation confirms that the concrete c has completely spread in the concave space 10 and has been completely filled.

At this time, if the positions of the return channels 1f,... In the concave space 10 are low, the concrete c may flow out before the concave space 10 is sufficiently filled with the concrete c. For such a reason, as described above, each return channel 1f,.
Is formed so as to be higher than the supply flow path 1e and communicate with the top of the concave portion 1b.
Then, by hardening the concrete c in the concave space 10, a concave-convex fitting portion is naturally formed between the foundation 2 and the curved plate 1 for arch tunnel. This allows
The relative movement of the arch tunnel curved plate 1 in the horizontal direction (the left-right direction in FIG. 1) with respect to the foundation 2 is regulated.

According to the arch tunnel curved plate installation structure, each arch tunnel curved plate 1 is installed on each foundation 2 so that the two concave portions 1b, 2b coincide with each other, and is fixed by bolts. An uneven fitting portion is formed between each foundation 2 and each arch tunnel curved plate 1 by a relatively easy method of merely injecting and hardening the concrete c into the recess space 10 formed in the above. be able to. Moreover,
In addition to the fastening force by the bolt connection, the concave portions 1b and 2b
And the fitting force between the fitting body 8 and the fitting body 8 reliably restricts the movement of the arch tunnel curved plate 1, so that the arch tunnel curved plate 1 can be firmly fixed to the foundation 2. Further, this fitting connection is also useful for reducing the external force applied to the bolts 3 and 3 to prevent deformation. Thereby, the connection between the two can be changed by bolts 3,.
It can be made more robust as compared with the fixing method using only. Therefore, the workability is good and the installation can be firmly fixed.

In the above-described embodiment, each arch tunnel curved plate 1 is fixed with four bolts 3,..., However, the present invention is not limited to this, and one to three or five or more bolts are used. It may be fixed. Further, the return channel 1f and the supply channel 1e adopt a configuration in which they are formed so as to open toward the outside of the arch tunnel to be constructed. However, the present invention is not limited to this. A configuration that is formed so as to perform this may be adopted. In addition, the recessed space 10 has a hexagonal column shape, but is not limited to this. For example, another shape such as an X-shaped column shape in cross section shown in FIG. 3 or a triangular prism shape shown in FIG. good.

[0016]

According to the method for installing a curved plate for an arch tunnel according to the first aspect of the present invention, the lower end of the curved plate for an arch tunnel is installed on a foundation, so that both concave portions formed on each of these joint surfaces are provided. Are overlapped to form a concave space, and then a hardening fluid such as concrete is poured into the concave space to harden the hardening fluid. According to this installation method, an uneven fitting portion can be formed between the foundation and the curved plate for the arch tunnel by a relatively easy method, so that the connection between the two is compared with a fixing method using only bolts. To be more robust. Therefore, the workability is good and the installation can be firmly fixed.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of an arch tunnel curved plate installation structure constructed by an arch tunnel curved plate installation method of the present invention.

FIG. 2 is a perspective view of a main part of the lower end of the curved plate for the arch tunnel as viewed obliquely from below.

FIG. 3 is a modified example of the first embodiment, and is a view corresponding to a portion A in FIG. 1;

FIG. 4 is a modified example of the embodiment, and is a view corresponding to a portion A in FIG. 1;

FIG. 5 is a perspective view of a conventional arch tunnel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Curved plate for arch tunnel 1b, 2b ... Recess 1c, 2a ... Joining surface 2 ... Foundation 10 ... Recess space c ... Concrete (hardening fluid)

Continued on the front page (72) Inventor Takashi Kunifuji 1-12-1, Yurakucho, Chiyoda-ku, Tokyo F-term in Ishikawashima Construction Materials Industry Co., Ltd. (Reference) 2D055 AA07 BB02 GC01 KB08

Claims (1)

[Claims] 1. A method of mounting and fixing a pair of left and right arch tunnel curved plates forming an arch by joining upper joining surfaces to each other on a pair of left and right foundations, By setting the lower end portion of the curved plate, the two concave portions formed on each of these joint surfaces are overlapped to form a concave space, and then a hardening fluid such as concrete is poured into the concave space to remove the hardening fluid. Curing plate installation method for arch tunnel characterized by curing.