JP3511145B2 - How to build underground structures - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground structure.

[0002]

2. Description of the Related Art Construction of an underground structure by the conventional pipe roof construction method has been carried out in a relatively shallow portion where the earth cover is 1 m to 2 m.

[0003]

However, the conventional method has the following problems. <A> In the conventional pipe roof construction method, in the case of construction with a large overburden, the support pitch becomes dense, resulting in a high construction cost and a prolonged construction period. <B> With a conventional pipe roof, it is difficult to construct in the case of a large soil cover or a large span.

[0004]

OBJECT OF THE INVENTION The present invention is to provide a method for constructing a large-scale underground structure.

[0005]

The present invention relates to a method for constructing an underground structure, in which a pipe roof is formed in the ground near the upper part of the underground structure to be built, and the ground below the pipe roof is formed. While excavating, the pipe roof is supported by a support to form a space, a support pile is formed below the ground from the space, and the pipe roof is supported by the support pile through the support, It is a method of constructing an underground structure, which comprises excavating the ground to construct an underground structure.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. <B> Outline of underground structure construction To construct an underground structure 1 with a large space, for example, a structure on the 3rd floor underground as shown in Fig. 1, in an underground part with a large soil cover of, for example, 7m. First, the underground structure 1 to be constructed
The starting shaft 2 is provided on the ground on the side of the (see FIG. 3). The starting shaft 2 is obtained by constructing the wall surface with a continuous underground wall. Using this starting shaft 2, a pipe 3 is placed in the upper ground of the underground structure 1.
1 is inserted and the pipe roof 3 is created (see FIG. 2).
While excavating the ground below the pipe roof 3, the truss structure 4 is constructed to support the pipe roof 3. Utilizing the working space portion 42 of the truss structure 4, the continuous underground wall 5 is installed at both ends of the pipe roof 3 and the support pile 52 is installed in the central portion. These continuous underground wall 5 and support pile 52
The pipe roof 3 is supported by the truss structure 4. If the pipe roof 3 is supported, the ground below will be excavated to build a large space underground.

<B> Starting shaft 2 as shown in FIG. 3 at both ends of the underground structure 1 where the pipe roof is to be constructed.
Is constructed with conventional drilling technology. The starting shaft 2 is, for example,
The opening is 10 m wide and 100 m long, and the depth depends on the depth of the underground structure to be constructed. A pipe 31 is propelled from this starting shaft 2 by the propulsion method, and the planned underground structure 1
A pipe roof 3 is formed in the upper part of the ground as shown in FIG.
The pipe roof 3 is constructed, for example, by inserting a plurality of reference pipes at intervals and inserting a pipe 31 between the reference pipes. In order to shorten the work period, the pipes 31 are simultaneously inserted from a plurality of places. The pipe roofs 3 on both sides are placed so as to form a vertical surface while lowering the excavation surface of the starting shaft 2. The pipe 31 of the pipe roof 3 propels the pipe 31 while welding in the starting shaft 2.

<C> Construction of truss structure The truss structure 4 is installed below the pipe roof 3 to support the pipe roof 3. The truss structure 4 is, for example, as shown in FIG.
As described above, the truss portion 41 and the working space portion 42 are included. In this work space portion 42, work such as excavation, and loading and unloading of materials and earth and sand are performed. Truss structure 4
Is, for example, 3 m in height and 3 m in width, and in the length direction, a truss portion 41 having a unit length of 6 m and a unit length of 4 m in between
It has a working space part 42 and a part 42 which doubles as a future beam. On both sides, a working space portion 42 made of a large member is formed without using a truss structure.

To construct the truss structure 4, first, work road shafts are installed along the pipe 31 at both sides of the pipe roof 3 and at intermediate positions. The work tunnels on both sides will be supported by large members. Using these working tunnels, materials are carried in and earth and sand are carried out, the lower ground of the pipe roof 3 is excavated, and the pipe roof 3 is supported. Fig. 5
When a predetermined distance, for example, 4 m is excavated as described above, H steel is used, a pressure plate 44 is constructed, the truss portion 41 and the working space portion 42 that have been divided and carried in are assembled, and the pipe roof 3 is supported. . The excavated earth and sand are the work space part 4
It is conveyed to the outside via the 2. By repeating this process, the process goes to the ground at the back of the pipe roof 3 and the truss structure 4 supports the entire pipe roof 3.

<D> Construction of continuous underground wall Guide walls 45 are provided in the work space portions 42 on both sides of the pipe roof 3, and a low wall continuous wall excavator 51 is installed in FIG.
The ground is excavated and the continuous underground wall 5 is constructed below the planned underground structure. It is necessary to lower the groundwater level before the construction of the continuous underground wall 5. for that reason,
For example, the start shaft 2 can be used to construct a water collection tunnel by a propulsion method.

<E> Construction of support piles A plurality of support piles 52 are installed on the ground below the pipe roof 3. The continuous underground wall 5 and the support pile 52 can be constructed at the same time. The support pile 52 is constructed with a predetermined gap by a cast-in-place pile machine by, for example, the deep foundation method. In order to prevent the deformation of the ground, the support piles 52 are constructed, for example, at intervals of every other. Next, the upper part of the continuous underground wall 5 is raised to support the truss structure body 4. Further, the jacks 53 and H steel are arranged on the support piles 52 to temporarily receive the truss structure 4, the working space portion 42 of the truss structure 4 is wound, and the through beam 46 of the RC structure is orthogonal to the truss structure 4. The support pile 52 is fixed at the upper end. Furthermore, another support pile 52 is constructed between the existing support piles 52, the truss structure 4 is similarly supported, and the entire pipe roof 3 is supported by the continuous underground wall 5 and the support piles 52.

<F> Construction of floor slab The ground below the pipe roof 3 is excavated to construct the first floor underground, the second floor underground, and the middle floor slab 61. For example, when the third basement floor is the bottom slab 6, leveling concrete is poured, and the reinforced concrete of the bottom slab 6 is constructed thereon.

<G> Construction work using PC member A pillar on the third basement floor and a beam on the second basement floor are constructed using a PC steel material, and the fixing of the pillar and the beam is performed using a PC steel wire. Furthermore, the side wall of the third basement floor, the pillar and side wall of the second basement floor, and the first basement floor will be constructed in sequence.

[0014]

According to the present invention, the following special effects can be obtained. <a> Since the pipe roof is supported by the continuous underground wall and the support pile through the truss structure, it is possible to construct a large-scale underground structure even if there is a large overburden on the pipe roof. You can <B> By adopting the truss structure, the interval between the support piles can be increased. <C> Workability is improved by creating a space inside the truss structure. <D> The space inside the truss structure can be used for facilities such as air conditioning. <E> You can carry in and out of equipment and materials and earth and sand by using the truss structure space.

[Brief description of drawings]

[Figure 1] Side view of underground structure

FIG. 2 Side view of the pipe roof

FIG. 3 is a plan view of the pipe roof.

FIG. 4 is a side view of the truss structure body.

[Fig. 5] Construction drawing of the truss structure

[Fig. 6] Excavation diagram of continuous underground wall

[Explanation of symbols]

1 ... Underground structure 2. Start shaft 3 ... Pipe roof 4 ... Truss structure 41 ... Truss part 42 ... Work space 46 .. Through beams 5: Continuous underground wall 52..Support piles

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshio Nishida 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (56) Reference JP-A-3-84200 (JP, A) Japanese Patent Flat 4-194295 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 29/04 E02D 5/18 E02D 27/12 E21D 9/04 E21D 13/00

Claims (5)

(57) [Claims] 1. A method for constructing an underground structure, wherein a pipe roof is formed in the ground near an upper portion where the underground structure is to be constructed, and a work space portion is provided while excavating the ground below the pipe roof. A truss structure supports the pipe roof, a support pile is formed below the ground from a working space portion of the truss structure, and the support pile supports the pipe roof via the truss structure, and the ground below A method for constructing an underground structure, characterized by excavating an underground structure. 2. A method for constructing an underground structure, wherein a pipe roof is formed in the ground near an upper portion where the underground structure is to be constructed, and the ground under the pipe roof is excavated while having a working space portion. The pipe roof is supported by a truss structure, a continuous underground wall is formed below the ground from the working space portions at both ends of the pipe roof, and a support pile is formed below the ground from another working space portion, A method for constructing an underground structure, comprising constructing an underground structure by supporting the pipe roof via the truss structure with the underground wall and the support pile and excavating the ground below. 3. A method for constructing an underground structure, wherein a pipe roof is formed in the ground near an upper portion where the underground structure is to be constructed, and the ground under the pipe roof is excavated while having a working space portion. The pipe roof is supported by a truss structure, a support pile is formed below the ground from the work space portion, a work space portion of the truss structure is rolled up to form a beam, and the support pile is provided via the beam. A method for constructing an underground structure, which comprises constructing an underground structure by supporting the pipe roof and excavating a ground below. 4. A method for constructing an underground structure, wherein a pipe roof is formed in the ground near an upper portion where the underground structure is to be constructed, and a work space portion is provided while excavating the ground below the pipe roof. A truss structure supports the pipe roof, a support pile is formed below the ground from the work space portion, and the truss structure body is pushed up on the support pile by a jack, and the work space portion of the truss structure body is rolled up. A method for constructing an underground structure, characterized in that a beam is formed by, the pipe roof is supported by the support pile through the beam, and the ground below is excavated to construct an underground structure. 5. A method for constructing an underground structure, wherein a pipe roof is formed in the ground near an upper portion where the underground structure is to be constructed, and a work space portion is provided while excavating the ground below the pipe roof. The pipe roof is supported by a truss structure, a support pile is formed below the ground from the work space portion, and the truss structure is pushed up on the support pile by way of H steel by a jack. An underground structure, characterized in that a working space is rolled up to form a beam, the pipe roof is supported by the support pile through the beam, and the ground below is excavated to construct an underground structure. How to build.