JP2540099B2 - Underground structure and its construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, the construction of an underground structure has been carried out by providing a temporary mountain retaining wall, then excavating by cutting beams and waving up, and after this excavation, constructing a structure such as columns, walls, and beams. I was doing.

[0003]

In the conventional construction, since the number of steps is large and each step is troublesome, not only the construction period is long, but also much labor is required. It is an object of the present invention to provide an underground structure that can be easily constructed by using concrete sheet piles in a short construction period and can save labor, and a method for constructing the underground structure.

[0004]

[Means for Solving the Problems] An underground structure of the present invention that achieves the above object is to combine a plurality of concrete sheet piles with a wall portion formed by placing concrete sheet piles side by side and to fill the inside with concrete. And a beam member that connects the surface portion of the concrete sheet pile of the wall portion to each other.

In addition, the method for constructing an underground structure includes the steps of placing a concrete sheet pile along a planned wall portion of the underground structure and placing a plurality of concrete sheet piles in a planned column portion in a state where the concrete sheet piles are combined. After excavating the inside of the concrete sheet pile combined with the part, the step of inserting a reinforcing bar and filling the concrete, the step of connecting the surface portion of the concrete sheet pile of the wall planned portion with a beam member, and the wall planned portion The process comprises excavating the inside surrounded by concrete sheet piles.

[0006]

In the underground structure having the above-mentioned structure, the wall portion and the pillar portion are all formed by placing concrete sheet piles,
The outer shell can be constructed by placing concrete sheet piles, and can be easily constructed in a short period of time. The construction method of the above configuration is simple in construction because the walls and columns that are the skeleton of the underground structure can be constructed by placing concrete sheet piles along the planned wall positions and the planned column positions.

[0007]

1 is a plan sectional view of an embodiment of the present invention, FIG.
Is a vertical sectional view thereof, and FIG. 3 is a partial sectional view thereof. The present invention forms a wall portion and a pillar portion by placing a concrete sheet pile, and in these drawings, reference numeral 1
Is a concrete sheet pile placed at the planned wall position. This concrete sheet pile 1 is formed in a flat plate shape, and an engaging portion 2 is formed on a side portion thereof. By this engaging portion 2, the adjacent sheet piles 1 and 1 are fitted in each other, and are driven side by side along the planned wall position.

Reference numerals 3 and 4 are concrete sheet piles that are placed at the planned pillar positions, and the concrete sheet piles 3 are placed at the corners of the underground structure. This concrete sheet pile 3 is bent at a right angle. On the other hand, the concrete sheet pile 4 is the concrete sheet pile 1 forming the wall portion.
It has the same shape as the flat plate. Then, other concrete sheet piles 5 and 6 are combined with these concrete sheet piles 3 and 4 and are placed facing each other. That is, a concrete sheet pile 5 bent at a right angle is placed on the concrete sheet pile 3, and a concrete sheet pile 6 formed in a rectangular shape with one surface open is abutted and placed on the concrete sheet pile 4.

These concrete sheet piles 5 and 6 are cast and form a cylindrical closed portion between the corresponding concrete sheet piles 3 and 4 to form a column portion. The concrete sheet piles 3, 5 and 4, 6 of the pillar portion are placed at the same depth as the concrete sheet pile 1 of the wall portion, but may be placed deeper than the concrete sheet pile 1 as shown in FIG. . The extended portions 3a and 4a (5a and 6a are not shown) thus deeply cast serve as a support pile for the constructed underground structure.

After placing the concrete sheet piles 3, 5 and 4, 6 of the pillar portion as described above, the insides of the closed portions 7 and 8 surrounded by the concrete sheet piles are excavated to remove the earth and sand, and thereafter. The reinforcing bar basket 9 is inserted into the closing portions 7 and 8. Then, the closed portions 7 and 8 are filled with concrete and cured and hardened. As a result, the concrete sheet piles 3, 5 and 4, 6 and the concrete are integrated to complete the pillar portion of the underground structure.

Next, a beam member 10 is provided to connect the concrete sheet piles 1 on the wall portion. This beam member 10 is made by straddling the concrete sheet piles 1 between the concrete sheet piles 3, 5 and 4, 6 of the pillar portion. In this case, the beam member 10 is hung on the surface of the concrete sheet pile 1,
The arrangement of the beam members 10 provides a structure that prevents the concrete sheet pile 1 from falling inward. Therefore, after arranging the beam member 10, the inside surrounded by the concrete sheet pile 1 is excavated, but at this time, it is not necessary to perform cutting beams and waving. This excavation is carried out to a depth corresponding to the basement-floor part of the underground structure, and after this excavation, an underground beam 11 is provided as shown in FIG. 2, and the underground part of the concrete sheet pile 1 of the wall part is provided. Support. Through the above process,
You can build the frame of underground structures such as walls and beams. This makes it possible to construct an underground structure with a simple process in a short period of time and with less labor.

FIG. 4 shows another embodiment of the present invention. As a concrete sheet pile 20 forming a wall portion and a column portion,
All have the same shape. That is, the concrete sheet pile 20 is formed in a substantially π shape, and the sheet piles 20 are placed side by side to form a wall portion. On the other hand, with respect to the concrete sheet pile 20 in the planned column, the concrete sheet pile 20 having the same shape is placed in a state of being inverted by 180 degrees. Then, the closed portion of the concrete sheet piles 20 that are abutted with each other is excavated, the reinforcing bars 21 are inserted, and the pillars of the underground structure are formed by filling the concrete. In this embodiment, since only the concrete sheet pile 20 having a single shape is used, there is an advantage that the construction of the underground structure can be performed more easily.

FIGS. 5 and 6 further show another embodiment of the present invention, showing another example of the combination of concrete sheet piles forming the pillar portion. In FIG. 5, a pair of flat plate-shaped concrete sheet piles 41 are placed facing the concrete sheet pile 4, and the tip ends of the concrete sheet piles 41 are connected by a flat sheet-shaped concrete sheet pile 42. Moreover, what is shown in FIG. 6 is a concrete sheet pile 1 in the form of a box and a concrete sheet pile 3 formed in advance in a box shape.
It is a combination of 1. In this way, various combinations can be selected according to the work conditions such as the situation at the site and the strength when constructing the pillar portion.

[0014]

INDUSTRIAL APPLICABILITY As described above, since the present invention constructs an underground structure using concrete sheet piles, the construction is simple and can be performed in a short period of time and with labor saving.

[Brief description of drawings]

FIG. 1 is a plan sectional view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the same embodiment.

FIG. 3 is a partial sectional view of the same embodiment.

FIG. 4 is a sectional view of another embodiment of the present invention.

FIG. 5 is a sectional view of another embodiment of the present invention.

FIG. 6 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

 1 Concrete Sheet Pile 3 Concrete Sheet Pile 4 Concrete Sheet Pile 5 Concrete Sheet Pile 6 Concrete Sheet Pile 9 Rebar

Claims (2)

(57) [Claims] 1. A pillar portion formed by combining a plurality of wall portions formed by placing concrete sheet piles side by side and concrete sheet piles and filling the inside with concrete, and a surface of the concrete sheet piles of the wall portion. An underground structure comprising a beam member connecting the parts. 2. A step of placing a concrete sheet pile along a planned wall portion of an underground structure and placing a plurality of concrete sheet piles in a planned column portion in a combined state, and a concrete sheet pile combined with the planned column portion. After excavating the inside of, the step of inserting reinforcing bars and filling with concrete, the step of connecting the ground surface portion of the concrete sheet pile of the wall planned portion with a beam member, the interior surrounded by the concrete sheet pile of the wall planned portion A method for constructing an underground structure, which comprises the step of excavating a ground.