JP2002089199A - Curved slab for arched tunnel and joining structure therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curved slab for an arched tunnel and a joining structure therefor, enabling the more inexpensive execution of the arched tunnel. SOLUTION: The leg part 1a of the curved slab 1 for the arched tunnel is installed on a foundation 2, a joint bar 4 mounted on the leg part 1a is fixed to a reinforcing bar 5 protruding the foundation 2, and the leg part 1a, the reinforcing bar 5 and the joint bar 4 are integrally joined to the foundation 2 by curing concrete 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved plate such as a PCT (precast tunnel) plate used for constructing an arch tunnel and a joint structure thereof.

[0002]

2. Description of the Related Art An arch tunnel shown in FIG. 3 is known as an open tunnel method. In this tunnel, a pair of curved plates 11 and 11 on the left and right sides and their legs 11a are
2 and are fixed in the groove 12a provided on the base plate 2, and the upper joint surface 11b provided with the bolt box 13 is joined to each other with bolts and nuts to be installed in an arch shape, and next to the curved plate 11 after the installation, The curved plate 11 is installed in the same manner as described above, and the side joining surfaces 11c along the bending direction are joined to each other with bolts and nuts, thereby sequentially connecting them in the longitudinal direction of the tunnel. A bolt box is also provided on the side joint surface 11c, but is omitted in the drawing.

[0003] This arch tunnel has a foot 12 on a foundation 12.
When fixing 1a, the leg 11a is provided with a cutout penetrating in the thickness direction. Then, the leg 11a is inserted into the groove 12a.
Then, the leg 11a is positioned so as to be sandwiched between the inner and outer sides by the extrusion bolts 14 arranged on both sides of the groove 12a, and then concrete is poured into the groove 12a.

[0004]

In the above-mentioned arch tunnel, there is a problem that the construction cost is increased because a large amount of metal such as an extrusion bolt is used.

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 for an arch tunnel capable of constructing an arch tunnel at a lower cost and a joint structure thereof.

[0006]

As means for solving the above-mentioned problems, a curved plate for an arch tunnel having the following structure and a joint structure thereof are employed. That is, the curved plate for an arch tunnel according to claim 1 of the present invention is a curved plate for an arch tunnel that is installed in an arch shape on a foundation, and a cutout is provided on a leg fixed to the foundation. It is characterized by being provided so as to penetrate in the thickness direction.

[0007] The curved plate for an arch tunnel according to the second aspect is the curved plate for an arch tunnel according to the first aspect,
The cutting bar is provided so as to be insertable into and removable from a through hole formed in the leg portion.

A curved plate for an arch tunnel according to a third aspect of the present invention is the curved plate for an arch tunnel according to the first or second aspect, wherein the through hole is formed by embedding a sleeve.

According to a fourth aspect of the present invention, there is provided a joint structure for a curved plate for an arch tunnel, wherein the curved plate for an arch tunnel according to the first, second or third aspect has its legs installed on the foundation, and a reinforcing bar protruding from the foundation. And the legs are integrally joined to the foundation by hardening concrete together with the reinforcing bars and the bars.

In the present invention, the metal fittings used for joining the arched tunnel curved plate and the foundation need only be a rebar inserted into the through hole of the leg and a reinforcing bar protruding from the foundation.
The number of hardware to be used is smaller than before.

[0011] Further, by making the cut-out bars insertable into and removable from the through-hole, the time required for manufacturing the curved plate for the arch tunnel in a factory or the like is omitted, and the curved plate for the arch tunnel is directed to the site. The studs are not in the way when transported or temporarily stored on site.

By forming the through hole by embedding the sleeve, even if an excessive force acts on the curved plate for the arch tunnel from the stud, the sleeve reduces the concentration of stress.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a curved plate for an arch tunnel and a joint structure thereof according to the present invention will be described with reference to FIGS. 1 and 2. FIG. As shown in FIG. 1, the curved plate 1 for an arch tunnel is a curved plate made of reinforced concrete or a curved plate made of concrete-filled steel in which a steel shell is filled with concrete. The curved plate 1 for an arch tunnel is formed in a rectangular shape when viewed in a plan view and in an arc shape when viewed in a side view, and has a curved surface for an arch tunnel which is adjacent to the width direction of the tunnel and forms an arch on the upper joint surface b. Bolt boxes for joining to the plate are provided on both sides in the width direction of the plate itself, and bolt boxes for joining to the curved plate for the arch tunnel adjacent in the length direction of the tunnel are provided, respectively. Description is omitted here because it is the same as the conventional one.

The joint structure between the arch tunnel curved plate 1 and the foundation 2 will be described. The leg portion 1a of the arch tunnel curved plate 1 standing on the foundation 2 has a through hole 3 penetrating in the thickness direction of the plate. , Sleeve 3a. A penetrating bar 4 is installed in this through hole 3 so as to be insertable and removable.

A reinforcing bar 5 is disposed on the base 2 so as to partially project from the upper surface thereof in a U-shape. This rebar 5
Are provided on the inner and outer sides of the leg 1a, respectively, and are respectively connected to both ends of the stud 4.

The leg 1a is integrally joined to the foundation 2 by concrete 6 cast on the foundation 2. Both the reinforcing bar 4 and the reinforcing bar 5 are buried in the concrete 6.

The joint structure of the curved plate for arch tunnel configured as described above is constructed according to the following procedure. First, regarding the curved plate 1 for the arch tunnel, the leg 1
A streak 4 is inserted into the through hole 3 of a (see FIG. 2A).
Next, two arch tunnel curved plates 1 adjacent to each other in the width direction of the tunnel and forming an arch are lifted by a crane or the like,
The leg 1a is placed on the foundation 2. At this time, the formwork 7 used when constructing the foundation 2 is left. A mold frame 7 having a certain size covering the upper part of the reinforcing bar 5 is used (see FIG. 2B). Insert 4 and rebar 5 on foundation 2
And the two are rigidly joined by welding or the like. Subsequently, a new concrete 6 is cast on the foundation 2 so that not only the legs 1a but also the reinforcing bars 4 and the reinforcing bars 5 are completely buried (see FIG. 2 (c)). It is desirable that the fixing length of the reinforcing bar 5 to the reinforcing bar 5 be sufficiently long in consideration of the strength required for installing the curved plate 1 for arch tunnel. After a sufficient curing period has elapsed, the mold 7 is removed and the fixing of the leg 1a is completed (see FIG. 2D). During this curing period, the curved version for arch tunnel 1,
The joining of the upper parts of one another is also performed.

According to the joint structure of the curved plate 1 for an arch tunnel configured as described above, only the insert 4 and the reinforcing bar 5 are used for joining with the foundation 2. In addition, if the rebar 5 is constructed so as to expose a part of the rebar disposed inside the foundation 2, the construction is simple and the cost is low.

The penetrating bars 4 can be inserted into and removed from the through holes 3 so that they can be mounted on the site, so that the labor required for manufacturing the curved plate 1 for an arch tunnel in a factory or the like is omitted. In addition, even when the curved plate 1 for arch tunnel is transported toward the site or temporarily stored at the site, since the studs 4 do not interfere, in all of the manufacturing, transportation and installation work at the site. Work efficiency can be improved.

Further, the through hole 3 is formed by embedding the sleeve 3a. Even if an excessive force acts on the curved plate 1 for the arch tunnel from the stud 4, the sleeve 3a reduces the concentration of stress. Damage to the arch tunnel curved plate 1 can be prevented.

By the way, in the present embodiment, the stud 4
Can be inserted and removed, and a through-hole 3 for inserting a streak 4 is formed by embedding a sleeve 3a.
May be abolished, and the struts 4 may be fixed to the curved plate 1 for the arch tunnel. In this case, the above-described effect of enabling the insertion and removal of the stud 4 cannot be obtained, but it is sufficiently possible to reduce hardware by reducing hardware.

[0022]

As described above, according to the present invention,
The hardware used for joining the curved plate for the arch tunnel and the foundation only requires the rebar inserted into the through hole of the leg and the reinforcing bar protruding from the foundation, and the number of hardware used is smaller than before, An arch tunnel can be constructed at a lower cost.

In addition, by making the cut-out bars insertable into and removable from the through-hole, the time required for manufacturing the curved plate for the arch tunnel in a factory or the like can be omitted, and the curved plate for the arch tunnel can be directed to the site. The studs are not in the way when transported or temporarily stored on site. As a result, work efficiency can be improved in all of manufacturing, transportation, and installation work on site.

By forming the through hole by embedding the sleeve, even if an excessive force acts on the curved plate for arch tunnel from the stud, the sleeve reduces the concentration of stress. Damage can be prevented.

[Brief description of the drawings]

FIG. 1 is an elevational sectional view showing an embodiment of a curved plate for an arch tunnel and a joining structure thereof according to the present invention.

FIG. 2 is an explanatory view showing a procedure of joining a leg portion of a curved plate for an arch tunnel to a foundation.

FIG. 3 is a perspective view showing an example of the structure of a conventional arch tunnel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Curved plate for arch tunnels 1a Leg 2 Foundation 3 Through hole 3a Sleeve 4 Insert 5 Reinforcement 6 Concrete

 ──────────────────────────────────────────────────続 き Continuing 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 GC02 KC00

Claims (4)

[Claims] 1. A curved plate for an arch tunnel, which is installed in an arch shape on a foundation, wherein a leg portion fixed to the foundation is provided with a penetrating bar penetrating in a thickness direction. A curved version for arch tunnels, characterized by: 2. The curved plate for an arch tunnel according to claim 1, wherein the stud is provided so as to be insertable into and removable from a through hole formed in the leg. 3. The method according to claim 1, wherein the through hole is formed by embedding a sleeve.
The curved version for the described arch tunnel. 4. A curved plate for an arch tunnel according to claim 1, 2 or 3, wherein its legs are installed on said foundation, said studs are fixed to reinforcing bars protruding from said foundation, and said legs are further provided. Is joined integrally to the foundation together with the reinforcing bars and the reinforcing bars by hardening concrete together with the reinforcing bars and the reinforcing bars.