JPH093927A - Basement construction method and basement structure - Google Patents

Abstract

PURPOSE: To provide a basement construction method and a basement structure which can improve work efficiency at site and avoid adverse effect of uneven settlement on buildings in the neighborhood. CONSTITUTION: An underground part 11 where a wall section of a basement is positioned is digged, structural bodies 13, 14 which constitute the wall section are embedded and installed in the underground part 11, and an underground part 15 surrounded by the structural bodies 13, 14 is digged. A floor system 18 of the basement is arranged on a bottom 16 of an underground space 17 formed by the digging, a skelton of the basement is constituted by the floor system 18 and the structural bodies 13, 14, and a ground building is constructed above the skelton thereof.

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 a basement and a structure for the basement, whose body is made of concrete.

[0002]

2. Description of the Related Art In general, the temperature in the underground is smaller than that in the ground, so that it is cool in summer and warm in winter. In addition, the surroundings are surrounded by soil, and the sound insulation is high, the sound is hard to leak, and the sound from outside is hard to enter, so that the space can be a quiet space. As such a comfortable living space, a basement has been attracting attention even in ordinary houses. As a structure of the basement, a basement made of a concrete frame made of so-called RC or PC is known.

As a construction method of this type of basement, in order to embed and install a structure constituting a wall portion and a floor slab constituting a floor portion, a main pile side sheet pile construction method, a cast-in-place wall construction method,
The horizontal cutting beam method, the earth anchor method, and the like have been used to sequentially excavate the ground while forming a retaining wall for retaining soil (for example, Japanese Patent Laid-Open No. 4-470).
No. 76).

[0004]

However, in this type of construction method, the underground excavation work is performed while the earth retaining work is performed. Moreover, after the skeleton is completed in the ground, the mountain retaining walls such as sheet piles must be removed and the soil must be backfilled, which causes a problem that work efficiency at the site is not good. In addition, since it takes time to build the skeleton of the basement after underground excavation, there is a risk of uneven settlement of neighboring buildings.

The present invention has been made against the background of such circumstances, and provides a basement construction method and basement structure capable of improving work efficiency on site and avoiding adverse effects of differential settlement on neighboring buildings and the like. The purpose is to do.

[0006]

In order to achieve the above object, the method of constructing a basement according to claim 1 excavates an underground portion where a wall portion of the basement is located, and the wall portion is formed in the underground portion. The structure constituting the is embedded and installed, the underground portion surrounded by the structure is excavated, and the floor slab of the basement is arranged at the bottom of the underground space formed by this excavation The structure of the basement is composed of the structure and the structure, and an above-ground building is constructed on the upper part of the structure.

A basement structure according to a second aspect of the present invention comprises a structure forming a wall of the basement and a floor slab forming a floor of the basement, and the structure is a ground on which the floor slab is arranged. The feature is that it also serves as a sheet pile when excavating the inside.

The basement structure according to claim 3 is the structure according to claim 2.
In the basement structure described in [1], a collapse prevention part that prevents the structure from falling down is provided at an upper edge portion of the structure.

A basement structure according to a fourth aspect is the second aspect.
Alternatively, in the basement structure according to any one of claims 3 to 4, at a top edge portion of the structural body, a base portion for disposing a foundation of an above-ground building constructed on an upper part of a structure of the basement is provided. It has a feature.

[0010]

According to the method of constructing a basement according to claim 1, first, only the underground portion where the wall of the basement is located is excavated,
The structure that constitutes the wall portion is embedded and installed in this underground portion. Next, the underground portion surrounded by the structure is excavated, the floor slab of the basement is disposed at the bottom of the underground space formed by the excavation, and the basement is separated from the floor slab and the structure. The body of is composed. And
An aboveground building will be built on top of this structure. in this way,
Since the structure also serves as a cliff wall, cliff work is not required after the structure is installed, and only underground excavation work may be performed. Moreover, after the structure is completed in the ground, since the structure is a part of the structure of the basement, it is not necessary to remove it and refill the soil around the structure, and work efficiency at the site is good. Become. By improving the work efficiency in this way, the time required for building the skeleton of the basement after underground excavation can be reduced, so that the adverse effects of uneven settlement on neighboring buildings and the like can be avoided.

According to another aspect of the present invention, there is provided a basement structure comprising a structure forming a wall of the basement and a floor slab forming a floor of the basement, wherein the structure is provided with the floor slab. Since it also serves as a sheet pile when excavating the ground, there is no need for sheet piles, and there is no need for pier work after installing the structure, removal of sheet piles, and backfilling of soil around the structure. The work efficiency in the field is improved.

According to the basement structure of a third aspect of the present invention, since the collapse preventing portion for preventing the structure from falling into the underground space is provided at the upper edge of the structure, the structures facing each other. In between, there is no need to span slabs or beams to prevent collapse, the upper surface of the basement skeleton can be opened, and the flexibility of the basement design plan can be greatly increased.

A basement structure according to a fourth aspect is the second aspect.
Alternatively, in the basement structure according to any one of claims 3 to 5, at a top edge portion of the structure, a base portion for arranging a foundation of an above-ground building constructed on an upper part of a frame of the basement is provided, Not only the degree of freedom of the design plan of the basement but also the degree of freedom of the design plan and renovation plan of the aboveground building can be greatly increased.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. (Example 1) In FIG. 5 (A), 1 indicates a site and 2
Is the place to install the basement. That is, the point 2 is
It is excavated by the construction method described below. As shown in FIG. 5 (B), the basement in this embodiment is provided with four wall portions 3 and one floor slab 4 arranged at the bottom of the underground space formed by excavation.

This basement is constructed by the construction method shown in FIG. That is, first, only the underground portion 11 where the wall 3 of the basement is located is excavated (A). Then, the waterproof sheet 12 is laid on the underground portion 11 (B). This waterproof sheet 12 is intended to prevent the water from leaching into the ground when concrete is poured into it, which will be described later, and to protect the surface of the excavated portion (underground portion) 11.

Next, a structural material 13 such as a reinforcing bar is arranged from the ground in the excavation site 11 (C). The concrete 14 is excavated at a location 11 while stabilizing the posture of the structural material 13.
It is poured into the interior to drive concrete (D). The concrete 14 and the structural material 13 are a structural body that constitutes a wall portion, and are embedded and installed in the excavation site 11 by steps C and D.

After the concrete 14 is completely solidified, an underground portion 15 surrounded by a structure such as the concrete 14 is formed.
Drilling. At this time, the excavation bottom surface 16 is set above the lower end portion 14a of the concrete 14 (E). This is to prevent the concrete 14, 14 from collapsing into the underground space 17 formed by excavation by supporting the soil below the excavation bottom surface 16. Further, the floor slab 18 of the basement is arranged on the bottom 16 of the underground space 17 (F). The floor slab 18 is a factory-produced PC slab, but may be on-site cast concrete or a factory-produced slab. The floor slab 18 and the structural body, that is, the structural material 13 and the concrete 14 constitute the skeleton of the basement. Then, a new ground building or an extension ground building is constructed on the upper part of this frame.

According to the above-mentioned basement construction method, since the structure (the structural material 13 and the concrete 14) also serves as the earth retaining wall for the soil W, the earth retaining construction is unnecessary after the concrete 14 and the like are installed. It is only necessary to perform the underground excavation work of the underground portion 15. Moreover, after the structure is completed in the ground, the structure such as the concrete 14 is a part of the structure of the basement, so it is not necessary to remove it and refill the soil around the structure. Efficiency is good. And by improving the work efficiency in this way, it is possible to shorten the time taken to construct the basement skeleton after underground excavation, so synergistically avoid the adverse effect of differential settlement on neighboring buildings. You can

(Embodiment 2) FIG. 2 shows a basement structure according to the present invention. Three structure bodies 21 constituting a basement wall portion and one floor slab 22 constituting a basement floor portion are shown. It consists of and. The structural body 21 is similarly composed of the structural material 13 and the concrete 14 in the first embodiment. The structure 21 also serves as a sheet pile when excavating the ground (corresponding to 15 in FIG. 1D) in which the floor slab 22 is disposed.

Further, at the upper edge 21a of the structure 21, a dog running (balm) 23 is provided as a collapse prevention part for preventing the structures 21 from collapsing into the underground space 17 in cooperation with each other. ing. The dog running 23 structurally functions as a rib. In addition, dog running 23
The lower surface portion of the ground surface G. L. Have been matched. This prevents the soil from falling into the underground space 17 as much as possible.

According to this basement structure, it is not necessary to extend a slab or a beam for preventing the collapse between the structures 21 facing each other, and it is possible to open the upper surface of the body of the basement, and to design the basement. The flexibility of the plan can be greatly increased.

(Embodiment 3) FIG. 3 shows another example of the basement structure according to the present invention. At the upper edge of the structure 31, the foundation of the aboveground building constructed on the upper part of the body of the basement is constructed. A base portion 32 to be arranged is provided. A dog running 33 similar to that of the second embodiment is also provided around each structure 31.

According to this basement structure, since the foundation 32 is provided in advance, not only the degree of freedom of the design plan of the basement, but also the degree of freedom of the design plan and the renovation plan of the aboveground building can be greatly increased. .

The present invention is not limited to the above embodiments, but includes various design changes that can be made by those skilled in the art. For example, in the above embodiment, as shown in FIG. 4 (A), the structure provided with three structural bodies 41 is shown. However, as shown in FIG. Due to the relationship and the like, the present invention can be applied to the one provided with the four structural bodies 42, and other than this, to the non-rectangular one in plan view.

[0025]

As described above, according to the basement construction method of the first aspect, since the structure doubles as the mountain retaining wall, the mountain retaining work is unnecessary after the structure is installed. It is only necessary to perform underground excavation work, and after the structure is completed in the ground, the structure is a part of the structure of the basement, so it is not necessary to remove it and refill the soil around the structure. There is an effect that work efficiency in the field is improved. Furthermore, by improving the work efficiency in this way, it is possible to shorten the time required to build the skeleton of the basement after underground excavation, so it is possible to avoid the adverse effect of differential settlement on neighboring buildings etc. There is also a synergistic effect.

According to the basement structure of the second aspect, the sheet pile is not necessary, and the mountain stopper work after the structure is installed,
It is not necessary to remove the sheet pile and refill the soil around the structure, which has the effect of improving work efficiency on site.

According to the basement structure of the third aspect, it is not necessary to span a slab or a beam for preventing the collapse between the structures facing each other, and the upper surface of the base of the basement can be opened. There is an effect that the flexibility of the basement design plan can be greatly increased.

The basement structure according to the fourth aspect has an effect that not only the degree of freedom in the design plan of the basement but also the degree of freedom in the design plan and the renovation plan of the aboveground building can be significantly increased.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a procedure of a basement construction method of the present invention.

FIG. 2 is a perspective view showing a first embodiment of the basement structure of the present invention.

FIG. 3 is a perspective view showing a second embodiment of the basement structure of the present invention.

FIG. 4 is a plan view of a basement showing another application example of the present invention.

FIG. 5 is a plan view of a site showing installation locations of basements of the present invention.

[Explanation of symbols]

 13 Structural Material (Part of Structure) 14 Concrete (Part of Structure) 18, 22 Floor Slab 15 Underground 23 Dog Running (Collapse Prevention Section) 32 Foundation

Claims (4)

[Claims] 1. An underground part where a wall part of a basement is located is excavated, a structure constituting the wall part is buried and installed in the underground part, and an underground part surrounded by the structure part is excavated. Then, the floor slab of the basement is arranged at the bottom of the underground space formed by this excavation to construct the skeleton of the basement from the slab and the structure, and the ground building is constructed on the upper part of the skeleton. A basement construction method characterized by: 2. A structure comprising a wall of the basement and a floor slab forming the floor of the basement, wherein the structure is a sheet pile for excavating the ground where the floor is installed. A basement structure that also serves as a basement. 3. The basement structure according to claim 2, wherein a falling-down prevention portion that prevents the structure from falling down is provided at an upper edge portion of the structure. 4. The base portion for disposing the foundation of an aboveground building constructed on the upper part of the skeleton of the basement is provided at an upper edge portion of the structure body. Basement structure according to any one of 3.