JPH0765313B2 - Underground construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an underground construction method applied to the construction of an underground structure such as an underground portion of a building or an underground parking lot.

<< Conventional Technology >> Conventionally, the beam construction method has been widely adopted as this type of underground construction method. The method of cutting beams is to temporarily construct a temporary steel material or RC member from shallow to deep with root cutting, and then use this as support work to dig deeper in sequence while supporting the retaining wall, and then the pillars and beams of the main structure. For floors and floors, the construction method is to proceed to the shallow steps while dismantling and removing the beams and upsets from the deep steps on each floor.

However, the above-mentioned beam construction method requires a large number of temporary man-hours such as loading and mounting of the uprising material of the beam and disassembly and removal when constructing the skeleton. Further, even after pouring concrete, it is necessary to cure for a certain period of time until the dismantling of beams and the like, so that the construction period is relatively long.

Therefore, in recent years, a construction method has been developed in which a crossbeam is used as a part of the main structure (for example, Japanese Patent Laid-Open No. 52-135509). However, in the case of an underground structure with a large floor area that requires multiple columns, means such as removal of multiple support piles temporarily installed to support the girder is adopted. Therefore, a lot of man-hours are still required.

On the other hand, as shown in, for example, Japanese Patent Laid-Open No. 63-312439, a ground wall is provided at a predetermined location on the ground, and while cutting the root surrounded by this ground wall, Build a frame with a steel frame structure and use this frame as a cutting beam to further cut the root while supporting the underground wall from the inside.
A method of constructing a permanent structure from the upper floor to the lower floor has also been developed. However, the above-mentioned construction method is called a so-called reverse construction method, and excavation is more troublesome than the sequential construction method of constructing a permanent structure from the lower floor to the upper floor, which requires a longer construction period and becomes expensive.

<< Problems to be Solved by the Invention >> Conventionally, in constructing a skeleton, a large number of temporary man-hours such as loading and mounting of a cutting beam and a waving material and dismantling and unloading are required. Further, even after pouring concrete, it is necessary to cure for a certain period of time until the dismantling of beams and the like, so that the construction period is relatively long. Furthermore, a large number of man-hours are required for installing and removing a plurality of support piles that are temporarily installed to support the beams. Moreover, even if the reverse construction method is used, it is difficult to dig down, and the whole construction period is long, resulting in higher costs.

The present invention has been made in view of the above circumstances, and provides an underground construction method capable of further reducing the man-hours, shortening the construction period, and reducing the cost by omitting the temporary construction work and incorporating the progressive construction method. With the goal.

<< Means for Solving the Problem >> The underground construction method according to the present invention forms a retaining wall in the ground,
Constructing a true pillar in the area surrounded by the retaining wall, and then cutting the root of the above area and attaching the beam part of the main structure to the true pillar. It is characterized in that it is used for supporting the dam to support excavation from the inside of the dam and excavation is performed, and after completion of the excavation, the main structure is constructed sequentially from the lower floor to the upper floor.

<< Operation >> According to the present invention, a structure pillar is constructed in an area surrounded by a moat wall formed in the ground, and thereafter, a beam portion of the main structure is constructed while root cutting is performed on this area. Since it is attached to the true pillar and these structural pillars and beams are used for the mountain shore support work, the temporary materials such as the mountain shore support work in the conventional underground construction are eliminated, and the loading and unloading of materials is greatly reduced. Overall labor saving can be achieved. Therefore, it is possible to further reduce the man-hours, the work period, and the cost.

In addition, by supporting the mountain wall from the inside by retaining structures by the structure columns and beams, which is the main structure, after the excavation is completed, the main structure is constructed sequentially from the lower floor to the upper floor by the progressive construction method. Therefore, excavation is easier to perform than the reverse construction method. Therefore, also in this aspect, the work efficiency can be improved and the construction period can be shortened.

<< Examples >> One example of the present invention will be described below with reference to the drawings.

1 to 8 are plan views and side sectional views sequentially showing the steps, and FIG. 9 is a side sectional view showing a part of the completed underground structure in an enlarged manner.

First, the steps will be sequentially described with reference to FIGS.

Construction of mountain stop wall 4 (Figs. 1 (A) and (B)) The excavating machine 2 and the crawler crane 3 are provided on a predetermined portion of the ground 1, that is, on the outer periphery of a portion where an underground structure is to be built.
The mountain stop wall 4 is provided by using, for example.

Construction of structural columns (for both beam support and shelf pile) (Figs. 2 (A) and (B)) Using steel pipes (hollow materials such as G column and ST column) for both beam support and shelf pile A true pillar 5 is installed. In this case, use the Tremi tube to perform RC construction of the rooting and filling parts.

Scraping work (Figs. 3 (A) and (B)) A power shovel 6 is used to scrape the area surrounded by the mountain stop wall 4 to the lower end of the beam on the first basement floor. Cut beam 7 that will be the beam part of the main structure on the first basement floor.
And, the abutment 8 is installed, and these skeletons, specifically, the concrete columns 5, the girders 7 and the abutment 8 are used for the mountain support, and the mountain wall 4 is supported from the inside. Then, the temporary slab for soil reinforcement is constructed. The beam is PC (SRC) or S member.

Primary excavation, construction of two-level girder (Figs. 4 (A), (B)) The skeleton consisting of the girder 7 and the uprising 8 is used for the mountain shore support work, and the mountain dome 4 is on the first basement floor. Supporting the inside from the part, the primary excavation, that is, the excavation of the second basement. Here, the two-storied girder, that is, the girder construction on the second basement floor is performed. The beam on the second basement floor will be PC (SRC) or S member.

Secondary excavation, construction of three-level girder (Figs. 5 (A) and (B)) In the same manner as here, the girder 7 and the uprising 8 of the second-floor girder, which is the frame of the main structure, are installed. It is used for the mountain shore support work to support the mountain dome 4 from the inside on the second basement, and perform secondary excavation, that is, the third underground. Here, we will construct a three-level girder, that is, a girder for the basement floor. The beam on the 3rd basement floor is PC (SR
C) or S member.

After the third excavation (Figs. 6 (A) and (B)) Here, as before, the cut beams 7 and uprisings 8 of the beam on the 3rd floor of the basement, which is the frame of the main structure, were used for the mountain troop support work. Then, the mountain stop wall 4 is supported from the inside on the third basement, the structure of the main structure is constructed, and the third excavation and the construction of the four-level beam are performed. This will form a beam on the 4th basement floor. Then, similarly, quaternary excavation and 5 steps of beams, etc. are carried out in sequence, and 5 underground
Beams below the floor are formed (not shown). In addition, 4,5 underground
Beams on and after the floor will also be PC (SRC) or S members.

Reinforcement plate, reinforcement of underground beam (Figs. 7 (A), (B)) After final excavation, flooring of pressure plate 10 at the lower end and construction of the final step beam, ground between the lower ends of construction columns 5 Reinforcement 9 such as middle beam 11 is performed, and pressure plate 10 and underground beam 11 described below are constructed.

Construction of pressure plate and underground beam (Figs. 8 (A) and (B)) Concrete placement is performed on the 9 bar arrangements, and the pressure plate
10 and underground beam 11 are formed.

Hereinafter, from the lower floor to the upper floor, the construction structure of the main structure, that is, concrete placing, is used to sequentially construct the girder 7 and the uprising 8 and the structure column 5 used for the mountain shore support work. Perform the actual construction.

As described above, as shown in FIG. 9, the retaining wall 4 formed at a predetermined location of the ground 1 is a true column as a retaining structure.
5, an underground structure that is supported by the cut beams 7 and the uprisings 8 and that has the structural columns 5, the cut beams 7 and the uplifts 8 as the main structure is constructed.

According to the present embodiment, the earth retaining wall 4 is formed in the ground 1, the structure pillars 5 are constructed in the area surrounded by the earth retaining wall 4, and then the root cutting is performed for the area. The beam portions 7 and 8 of the construction structure are attached to the true column 5, and the true column 5 and the beam portions 7 and 8 are utilized for the mountain shore support work to support the mountain cliff 4 from the inside for excavation. After the excavation is completed, the main structure is constructed sequentially from the lower floor to the upper floor.Therefore, the number of erection members for the conventional underground construction such as mountain shore support work is reduced, and the temporary construction work can be omitted altogether, and the material loading and unloading is significantly It can be reduced and labor can be saved. Therefore, it is possible to further reduce the man-hours, the work period, and the cost.

Further, since the method of constructing the permanent structure from the lower floor to the upper floor is used, the excavation is easier to perform than the reverse construction method. Therefore, also in this aspect, the work efficiency can be improved and the construction period can be shortened.

<< Effects of the Invention >> As described above, according to the present invention, the structure columns and the beam portions that are the main structure are used for the mountain stop support work to perform the excavation while supporting the mountain stop wall from the inside and completing the excavation. Later, since the main structure is constructed sequentially from the lower floor to the upper floor, it is possible to further reduce the man-hour, the construction period, and the cost as compared with the conventional structure.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, which is shown in FIG.
(B) -FIGS. 8 (A) and (B) are plan views and side sectional views sequentially showing the steps, and FIG. 9 is a side sectional view showing a part of the completed underground structure in an enlarged manner. 1 …… Soil, 4 …… Mountain wall 5 …… Structural pillar 7,8 …… Beam (cut beam, upset)

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Ikuo Ishikawa 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo headquarters (72) Inventor Satoshi Abe 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) References JP-A-63-312439 (JP, A)

Claims (1)

[Claims] 1. A foundation wall is formed by forming a retaining wall on the ground, constructing a structure pillar in an area surrounded by the retaining wall, and then cutting the root to the area. Are attached to the above-mentioned structure columns, and these structure columns and beam portions are used for the mountain shore support work to support the above-mentioned mountain walls from the inside for excavation, and after completion of digging, the main structure is moved up from the lower floor. An underground construction method characterized by sequentially building on the floors.