JP2002089197A - Curved slab for arched tunnel and joining structure therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance workability and bring about firm joining. SOLUTION: Upper joining surfaces 1a and 2a are made to face each other while being formed with a gap Ca between them by inserting the reinforcing bar 2c of one curved slab 2 into the inserting hole 1b of the other curved slab 1, the lower part of the gap Ca is plugged with packing 5, and a coupling plate 6 is temporarily fixed to the outer peripheral surfaces of the curved slabs 1 and 2 by means of a bolt 7. In such a state, grout G is injected from an injecting hole 1d into the inserting hole 1b, and injection is stopped when the grout G is correctly infilled into the inserting hole 1b, the gap C, and an auxiliary hole 1e. The joining of the curved slabs 1 and 2 is terminated when the injected grout G is cured. A saving in labor and the shortening of a construction period can be realized because a main operation is composed of only the injection of the grout G into the inserting hole 1b.

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.
Etc. and a joint structure thereof.

[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 to sequentially connect in the longitudinal direction of the tunnel. ing. Although a bolt box is also provided on the side joint surface 11g, it is omitted in the figure.

[0003] As another arch tunnel, a pair of left and right curved plates is joined by inserting a PC steel rod into a through-hole that is linearly communicated with each other while the upper joining surfaces are in contact with each other. Is being developed.

[0004]

In the former arch tunnel, when the upper joint surfaces 11a are joined to each other, a bolt must be inserted through an insertion hole provided in the bolt box 13 to screw a nut. In addition, since it is necessary to fill the mortar into the bolt box 13 to make the outer surface flat, there is a problem that the joining is troublesome. Further, it is difficult to obtain a strong and stable joining force by the bolt / nut method.

In the case of the latter arch tunnel, as in the former arch tunnel, there is a problem that the number of steps is large, labor is required, and the construction period is likely to be long.

SUMMARY OF THE INVENTION An object of the present invention is to provide a curved plate for an arch tunnel, which has good workability and can be joined firmly, and a joint structure thereof. Another object of the present invention is to provide a curved plate for an arch tunnel, which can omit a part of the water stopping operation, and a joint structure thereof.

[0007]

In order to achieve at least one of the above objects, an invention according to claim 1 is a curved plate for an arch tunnel in which upper joint surfaces are joined to each other and installed in an arch shape. An insertion hole for inserting a reinforcing bar protruding from the upper joint surface of the curved plate for another arch tunnel with a gap opened in the upper joint surface is formed, and grout is injected into the insertion hole into the insertion hole. The injection hole to be opened was connected to the outer peripheral surface.

In this means, the curved plate for the arch tunnel and another curved plate for the arch tunnel having a reinforcing bar protruding from the upper joint surface are inserted into the insertion hole with the reinforcing bar facing each other so that the upper joint surfaces face each other. The grout is injected into the insertion hole from above, and is cured by curing. As described above, it is only necessary to inject grout into the insertion hole and harden it. Since the number of steps is small, the joining operation can be performed efficiently and quickly, and the construction period can be shortened.

When the reinforcing bar of the curved plate for the arch tunnel is exposed in the insertion hole, the reinforcing bars of the pair of left and right curved plates are integrally connected by grout in the insertion hole, so that the joining force is reduced. Will be strengthened. It is preferable that an auxiliary hole for knowing the grouting state be connected to the insertion hole.

In the curved plate for an arch tunnel according to the first aspect, it is preferable that the insertion hole is formed by embedding a sleeve. With this configuration, the insertion hole can be formed accurately and easily at a predetermined position. Further, the sleeve is grouted to the reinforcing bar of the other curved plate to enhance the joining force.

According to a third aspect of the present invention, there is provided a curved plate for an arch tunnel according to the first or second aspect, and another curved plate for an arch tunnel having a reinforcing bar protruding from an upper joint surface.
Alternatively, in a state in which the rebar is inserted into the insertion hole of the curved plate for arch tunnel described in 2, the upper joint surfaces are opposed to each other, and the joint is formed by hardening the grout injected into the insertion hole from the injection hole.

According to this means, the joining operation of the curved plates can be performed quickly only by injecting grout into the insertion hole, and since the reinforcing bar is directly joined to the two curved plates, a strong and stable joining is achieved. Power is gained. In addition, grout is injected into the insertion hole to fill the gap,
It flows into the gap between the upper joint surfaces facing each other and hardens, and the portion is made liquid-tight. For this reason, the water stoppage work of the upper joint surface portion can be omitted.

[0013] Prior to grout injection into the insertion hole, usually, a packing is inserted between the lower portions of both upper joining surfaces,
In addition, the connection plate is temporarily fixed to the upper portion of the upper joint surface with bolts. Normally, the packing and the coupling plate are left as they are after the joining is completed.

[0014]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 3 show an embodiment of the present invention. The curved plate 1 for an arch tunnel has an elongated planar shape (front shape) and an arcuate side shape, and has an insertion hole 1b in an upper joining surface 1a which is upper in an installed state.

The insertion hole 1b is for inserting a reinforcing bar 2c protruding into the upper joint surface 2a of another curved plate 2 for an arch tunnel. One end is opened in the upper joint surface 1a and the inner curved portion is curved. The reinforcing bar 1c of the plate 1 is provided so as to be exposed. The inner diameter of the insertion hole 1b is made sufficiently larger than the outer diameter of the reinforcing bars 1c and 2c, and between them, for example, 7 to 10 m on one side.
A gap C of about m (doubled on both sides) is provided. The gap C may be larger or smaller than the above. Injection hole 1d and auxiliary hole 1 are inserted in insertion hole 1b.
e has been contacted.

The injection hole 1d is for injecting grout G into the insertion hole 1b. One end of the injection hole 1d is opened on the outer peripheral surface of the curved plate 1, and the other end is near the opening end of the insertion hole 1b. Contact is provided. The auxiliary hole 1e is for letting out the air in the insertion hole 1b at the time of injecting the grout G into the insertion hole 1b, while raising the grout G to notify the grout G injection state. Is opened on the outer peripheral surface of the curved plate 1 and the other end is provided so as to communicate with the inner part of the insertion hole 1b.

The curved plates 1 and 2 for the arch tunnel are, as in the prior art, usually a reinforced concrete curved plate or a concrete-filled steel curved plate in which a steel shell is filled with concrete. The plane shape and the side surface shape of the curved plate 2 are the same as those of the curved plate 1. Bolt boxes for joining are provided on the side joining surfaces 1g and 2g along the bending direction of the arch tunnel curved plates 1 and 2, similarly to the conventional curved plate, but are omitted in the figure.

The arch tunnel curved plates 1 and 2 having the above-described configuration are lifted by a crane or the like, and the lower portion thereof is formed on a foundation 12.
(FIG. 5), the reinforcing bar 2c of the other curved plate 2 is inserted into the insertion hole 1b of the one curved plate 1, and a gap Ca of about several mm is provided between the upper joint surfaces 1a, 2a to join the upper plate. Surface 1a, 2
a Face each other. And both upper joint surfaces 1a,
The lower portion of the gap Ca is closed by sandwiching the packing 5 between 2a, and the coupling plate 6 is temporarily fixed to the outer peripheral surfaces of the curved plates 1 and 2 with bolts 7, and the lower portions of the curved plates 1 and 2 are fixed on the foundation. The curved plates 1 and 2 are assembled in an arch shape when viewed in the longitudinal direction of the tunnel.

In the above state, grout G is injected from the injection hole 1d into the insertion hole 1b. On the one hand, the grout G flows into the inner part of the insertion hole 1b and gradually rises in the auxiliary hole 1e. On the other hand, the grout G flows out from the opening end of the insertion hole 1b into the gap Ca and gradually rises in the gap Ca. I do. The injection state is known from the ascending position of the grout G. When the grout G is correctly filled in the insertion hole 1b, the gap Ga and the auxiliary hole 1e, the injection is stopped. End the joining. In addition, 1 g of side joining surfaces, 1 g,
Needless to say, joining of 2g and 2g is performed in the same manner as before.

As described above, the preparation work such as the insertion of the packing 5 is extremely simple, and the main work is only required to inject the grout G into the insertion hole 1b. Can be.

In the above joining structure, the grout G fixes the reinforcing bar 2c of the curved plate 2 in the insertion hole 1b of the curved plate 1 and joins the reinforcing bar 2c to the reinforcing bar 1c. For this reason, a strong and stable joining force can be obtained. Further, since the grout G flowing out into the gap Ga makes the space between the upper joint surfaces 1a and 2a liquid-tight, it is possible to omit the water stop work without renewing the work.

FIG. 4 shows another embodiment of the present invention. The insertion hole 1b of the curved plate 1 is formed by embedding a sleeve 8 of steel or the like. Other structures are the same as those of the curved plate 1 for an arch tunnel and the joining structure thereof shown in FIGS. 1 to 3, and therefore, the same members and the like are denoted by the same reference numerals and description thereof is omitted.

In the curved plate 1 for an arch tunnel and its joint structure, the sleeve 8 facilitates the formation of the insertion hole 1b in the curved plate 1, and the reinforcing bars 1c, 2 are formed by grout G.
c to improve bonding strength, stability and reliability. The sleeve 8 is desirably welded to the reinforcing bar 1c.

Since the insertion hole 1b is deeply related to the reinforcing bars 1c and 2c, the formation position and number thereof are determined in consideration of the positions and numbers of the reinforcing bars 1c and 2c. Therefore, the present invention is not limited to the one shown in the drawing, and for example, the insertion holes 1b, 1b can be formed so as to overlap in the thickness direction of the curved plate 1. The reinforcing bar 1c of the curved plate 1 does not necessarily need to be exposed in the insertion hole 1b. The auxiliary hole 1e in the figure can be used as an injection hole, and the injection hole 1d can be used as an auxiliary hole. Reinforcing bars may project from a part of the upper joint surface, and insertion holes may be provided in other parts.

[0025]

As described above, according to the present invention,
A curved plate for arch tunnels and a joint that can perform a joining operation efficiently and quickly to shorten the construction period, obtain a strong and stable joining force, and save a part of the water stopping operation. Structure can be provided.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing an installation state of the arch tunnel curved plate of FIG. 1;

FIG. 3 is an external view of a main part of the arch tunnel curved plate of FIG. 1;

FIG. 4 is a cross-sectional view showing another embodiment of the present invention.

FIG. 5 is an external view of a conventional arch tunnel.

[Explanation of symbols]

1, Curved plate for arch tunnel 1a, 2a
Upper end joining surface 1b Insertion holes 1c, 2c
Reinforcing bar 1d Injection hole 1e Auxiliary hole 1g, 2g Side joint surface 5 Packing 6 Coupling plate 7 Bolt 8 Sleeve G Grout C, Ca Gap

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Kunifuji 1-2-1, Yurakucho, Chiyoda-ku, Tokyo Ishikawashima Building Materials Industry Co., Ltd. F-term (reference) 2D055 BB02 EB01 GC04 GC08

Claims (3)

[Claims] 1. A curved plate for an arch tunnel in which upper joint surfaces are joined to each other and installed in an arch shape, wherein a reinforcing bar protruding from an upper joint surface of another curved plate for an arch tunnel is inserted with a gap therebetween. A curved plate for an arch tunnel, characterized in that a hole is formed in the upper joint surface so as to be opened, and an injection hole for injecting grout into the insertion hole is opened and connected to the outer peripheral surface. . 2. The curved plate for an arch tunnel according to claim 1, wherein the insertion hole is formed by embedding a sleeve. 3. A curved plate for an arch tunnel according to claim 1 or 2, wherein the curved plate for an arch tunnel according to claim 1 or 2 and another curved plate for an arch tunnel having a reinforcing bar protruding from an upper joint surface. A joint structure for a curved plate for an arch tunnel, characterized by being joined by hardening of grout injected from an injection hole into the insertion hole in a state where the rebars are inserted into the insertion hole and upper joining surfaces face each other. .