JPH05179667A - Construction for underground structure - Google Patents

Abstract

PURPOSE:To reduce labor, time, materials required to support a form for constructing an underground structure, and construct the underground structure with higher workability and at a lower cost. CONSTITUTION:A retaining wall 2 is supported at a lower part than a position where a floor and beam structure 1 is formed by a strut device A which can switch from/to a supporting condition where the retaining wall 2 can be supported to/from a support releasing condition where the retaining wall 2 can be lifted, and a form 3 for forming the floor and beam structure is set at the position to be formed. The ground is excavated to a lower position than the position to be formed, and concrete is placed in a condition where the form 3 is supported to the previously formed upper floor and beam structure 1. After curing concrete, the strut device A is lowered to a lower position than the position where the next floor and beam structure 1 is formed. The form 3 is removed from the floor and beam structure 1 and is lowered to a position where the next floor and beam structure 1 is formed. It is thus possible to form the floor and beam structure 1 of the multiple floors in order from the upper one by repeating the above steps in order by preset frequency as described.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for producing a floor / beam structure of each floor in a deep underground structure. The girder device that can be switched to the state supports the mountain stop wall at a position lower than the planned floor / beam structure creation location, and the formwork for floor / beam structure creation Cutting beam and formwork work process to set at the planned creation site, excavation of the ground to a position below the planned creation site of the next floor and beam structure, and placing concrete with the formwork supported. After the excavation / creation process and the concrete curing, the support of the cliff wall by the cutting beam device is released and the cutting beam device is lowered to a position below the planned floor / beam structure creation site. Demolding the formwork from the floor / beam structure to move to the next floor / beam structure Of by repeating the set number of times and a diversion movement step on the the order of lowering the created planned portion relates to the construction method of creating a multi-storey floor-beam structure from above what order.

[0002]

2. Description of the Related Art Conventionally, an underground column such as a true column is created, and the underground column is supported by a formwork for creating a floor / beam structure for concrete placement.

[0003]

Therefore, according to the above-mentioned prior art, when the underground structure has a pillar, the pillar is used as an underground pillar to reduce the workability due to the creation of the underground pillar. Although it is easy to avoid, the number of supporting points supported by the underground columns of the formwork is only the number of underground columns, and the spacing between the supporting points is large. Therefore, a formwork with high rigidity is required, This has led to soaring formwork costs and lowering of operability for lowering formwork. Moreover, underground structures with a small floor area,
When creating an underground structure that does not require columns, such as an underground structure with a large length but a small width, creating an underground column that requires time, time and materials is a dedicated work only for formwork support. Therefore, the construction period was prolonged and the cost was increased. An object of the present invention is to provide a construction method capable of easily supporting a formwork at low cost.

[0004]

A feature of the method for constructing an underground structure according to the present invention is that the method for constructing an underground structure comprises a cutting beam / formwork working process, an excavation / preparation process, and a diversion / transfer process. The support of the formwork in the process is that it is supported by suspending and supporting the formwork on the floor / beam structure in the upper part that was created earlier.

[0005]

[Function] By utilizing the fact that the floor / beam structure has sufficient strength and rigidity in terms of its function, the previously-created floor / beam structure supports the formwork, so the supporting points can be set freely. Moreover, in order to support the formwork against the weight of the cast concrete, no special structures such as underground columns are required.

[0006]

Therefore, according to the present invention, the cost and weight of the formwork for producing the underground structure can be reduced, and the number of man-hours, time and materials required for supporting the formwork can be reduced. , Underground structures can now be created with good workability and at low cost.

[0007]

EXAMPLE As shown in FIGS. 3 to 12, there is a construction method for producing a floor / beam structure 1 made of reinforced concrete (normal concrete, high-strength concrete, etc.) on each floor of an underground structure. The beam device A used will be described. As shown in FIG. 1 and FIG.
A plurality of expandable and fixable first cutting beams 6A are arranged in parallel at intervals, and a plurality of expandable and fixable second cutting beams 6B are similarly arranged on the cut beam 6A group. Placed and fixed in a posture orthogonal to the cutting beam 6A of,
A pair of first uprisings 6C are provided in a state of connecting one end and the other end of the first cutting beam 6A, respectively, and one end and the other end of the second cutting beam 6B are provided. And a pair of second uprisings 6D are provided in a state where they are connected to each other. In other words, the cut beams 6A and 6B are stretched and fixed and raised, and the cut beams 6A and 6B are shortened and lifted so as to be lowered.
6D is configured to be freely switchable to a support release state in which 6D is separated from the underground wall 2. The mountain retaining wall 2 is a soil pile column wall or an underground continuous wall, and in the figure, a soil pile column wall in which the core material 2B is inserted into the soil concrete 2A is shown. Then, as shown in the drawing, the cutting beam device A raises the core material 2B of the soil concrete 2A, not the soil concrete 2A of the mountain stop wall 2, which is exposed by shaving inside, and abuts 6C and 6D. And the core 2B serves as a guide when descending. In the figure,
In the unsupported state, the angulations 6C and 6D are shown to be largely separated from the core 2B, but actually, in the unsupported state, whether the angulations 6C and 6D contact the core 2B. It slides and descends.
Of course, as shown in the drawing, the cores 2B may be located at a large distance from each other and may be lowered without using the core 2B as a guide.
Both the first cutting beam 6A and the second cutting beam 6B are H
It is composed of a beam member 6a using a shaped steel material and a jack 6b attached to both ends in the longitudinal direction so as to expand and contract in the longitudinal direction. The jack 6b is expanded and contracted by expansion and contraction. The procedure of the construction method will be described. (1) As shown in FIG. 3, a retaining wall 2 is created around a planned construction site of an underground structure, and the ground surrounded by the retaining wall 2 is excavated to a set depth. (2) As shown in FIG. 4, the beam device A is switched to the supporting state to support the mountain stopper wall 2 at a position lower than the planned creation position of the uppermost floor / beam structure 1, and -Set the formwork 3 for making the beam structure 1 at the planned making place. (3) As shown in FIG.
The concrete is placed after supporting it on the bottom of the excavation. (4) As shown in FIG. 6, after curing the concrete, the ground is excavated to a position lower than the planned location of the next floor / beam structure 1. (5) As shown in FIG. 7, the beam device A is switched to the support-released state and lowered to a position lower than the planned location of the next floor / beam structure 1, and then switched to the support state to stop the mountain. While supporting the wall 2, the mold is demolded from the created floor / beam structure 1 and lowered to the next floor / beam structure 1 to be created and set. (6) As shown in FIG. 8, the ground is excavated to a position below the planned location of the next floor / beam structure 1. (7) As shown in FIG. 9, floors that were previously created with the formwork 3
Concrete is placed in a state of being suspended and supported by the beam structure 1 via the wire 5. (8) After curing the concrete, as shown in FIG.
The beam device A is switched to the support-released state and lowered to a position lower than the planned floor / beam structure 1 to be created next, and the mold 3 is demolded from the floor / beam structure 1 and lowered. (9) As shown in FIG. 10, the lowered beam device A is switched to the supporting state to support the mountain stopper wall 2 below the planned creation position, and the lowered formwork 3 is created at the planned creation position. set. (10) As shown in FIG. 11, excavation was started to a position below the planned floor / beam structure 1 to be created, and as shown in FIG. 12, the form 3 was created first. floor·
Concrete is placed in a state of being suspended and supported by the beam structure 1 via the wire 5. (11) The steps (8) to (10) are repeated a set number of times to create a plurality of floors / beam structures 1 in order from the top. That is, the procedure of (8) is the diversion moving step, the procedure of (9) is the cutting beam / formwork working step,
The procedure of 0) is the excavation / creation process. In the above-mentioned example, the construction was carried out by using one beam device A,
As shown in FIG. 13, two or more beam cutting devices A may be used for construction. In other words, in this case, as shown in the drawing, the girder device A located below can support the mountain stop wall 2, so that excavation can be preceded. As shown in FIG. 14, as the cross beam device A, when a structure having a large area is targeted, the number of the cross beams 6A and 6B is increased to form the large cross beam device A. In the figure, the number of the first beams 6A is two as in the above embodiment, but of course the number may be more. Further, the truss device A may be supported by a column. The pillar may be a temporary pillar or a main pillar,
In terms of work, it is preferable to use the main pillar.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a main part.

FIG. 2 is a cross-sectional plan view of the main part

FIG. 3 is a vertical sectional view showing a construction procedure.

FIG. 4 is a vertical sectional view showing a construction procedure.

FIG. 5 is a vertical sectional view showing a construction procedure.

FIG. 6 is a vertical sectional view showing a construction procedure.

FIG. 7 is a vertical sectional view showing a construction procedure.

FIG. 8 is a vertical sectional view showing a construction procedure.

FIG. 9 is a vertical sectional view showing a construction procedure.

FIG. 10 is a vertical sectional view showing a construction procedure.

FIG. 11 is a vertical sectional view showing a construction procedure.

FIG. 12 is a vertical sectional view showing a construction procedure.

FIG. 13 is a vertical cross-sectional view of a construction state showing another embodiment.

FIG. 14 is a transverse plan view showing another embodiment.

[Explanation of symbols]

 1 Floor / beam structure 2 Mountain stop wall A Cutting beam device 3 Formwork

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Taniguchi 4-1-1 Hommachi, Chuo-ku, Osaka-shi, Osaka Takenaka Corporation Osaka Main Store

Claims (1)

[Claims] 1. A floor / beam structure (1) for a mountain retaining wall (2) with a cutting beam device (A) which can be switched between a supporting state for supporting the mountain retaining wall (2) and a support releasing state capable of moving up and down. Beam and formwork work process for supporting the lower part of the floor / beam structure (1) at a position lower than the planned location of the floor / beam structure (1) And an excavation / creation step of excavating the ground to a position lower than a planned location of the next floor / beam structure (1), and placing concrete with the formwork (3) being supported, After the concrete is cured, the support of the mountain retaining wall (2) by the beam cutting device (A) is released, and the beam cutting device (A) is placed below the planned floor / beam structure (1) to be created. While moving down to the position, the formwork (3) is demolded from the floor / beam structure (1) to move to the next floor / beam structure (1). There is a construction method for an underground structure in which the floor / beam structure (1) of a plurality of floors is sequentially created from the upper one by repeating the diversion transfer process of descending to the planned creation location and the set number of times in the stated order. A method for constructing an underground structure, in which the formwork (3) is supported in the excavation / preparation process by suspending and supporting the formwork (3) on the upper floor / beam structure (1) created earlier.