JPH09256366A - Yatco dual-purpose column and underground construction method using the column - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To eliminate the conventional yatco, shorten the work process, and improve workability. SOLUTION: A connecting member 10 is fixed to the lower part of a true column 6,
The structure column is fixed to the upper portion of the steel pipe pile 9 via a connecting member so that it serves as a yatco. Moreover, after constructing the mountain retaining wall, the steel pipe pile is embedded by using the Yatco dual-purpose structure column according to claim 1, then the first floor is constructed, and then the lower part of the first floor is cut off, then, Concrete is placed on the top of the steel pipe pile and the bottom of the true column.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to a technical field of an underground construction method in which a structure column is erected on the top of a striking steel pipe pile to construct an underground floor.

[0002]

2. Description of the Related Art Usually, when constructing a basement floor of a building, the basement floor is first excavated and constructed, and the building is constructed sequentially toward the upper floor. An underground construction method is known in which a basement floor is constructed after the construction is done in advance of root cutting.

Explaining this with reference to FIG. 3, first, a mountain retaining wall 1 is constructed, a hole is excavated at a predetermined place, a reinforcing steel cage is arranged in the hole, and then concrete is poured to cast the concrete in place. Simultaneously with the construction, the structure pillar 6 is built and integrated on the top of the cast-in-place concrete pile 5. After excavating to the bottom of the first floor beam with the excavating machine 2 and assembling the steel first floor beam 3, a part of the first floor 4 is constructed for the entry of the construction machine. After that, the lower part of the first floor 4 is excavated by the excavating machine 2 to a predetermined depth, and then the cast-in-place concrete pile 5 is used as a pillar to construct a mat slab (pressure resistant foundation) 7. Finally, the outer wall 8 and pillars are cast into concrete to complete the basement building.

According to the above-mentioned underground construction method, the floor beam of the frame of the first floor 4 can also be used as a temporary cutting beam for supporting the mountain retaining wall 1, and the first floor 4 is constructed prior to root cutting. Therefore, the first-floor floor 4 can also be used as the entrance gantry for the excavating machine 2, and the basement floor can be constructed over the entire site, and simultaneous up-and-down floor construction is also possible, which reduces temporary construction costs and construction period. Can be shortened.

[0005]

By the way, the underground construction method of FIG. 3 employs cast-in-place piles. However, when the ground is unsuitable for cast-in-place piles, steel pipe piles are constructed by hitting with a diesel hammer. The method of doing is adopted. However, in the above-mentioned underground construction method, since the diesel hammer is installed on the first floor 4 which also serves as a boarding platform, in order to embed the steel pipe pile 9 to a predetermined depth, the tip of the hammer and the top of the steel pipe pile 9 must be deep. After connecting the steel pipe pile 9 to a predetermined depth by connecting it with a connecting jig called Yatco having a length of a certain length, the Yatco is removed and the true pillar 6 is attached to the top of the steel pipe pile 9.
However, it has a problem of increasing the number of work steps and deteriorating workability.

The present invention is to solve the above-mentioned problems, and by eliminating the need for a yatco, the use of a yatco-combined true pillar capable of shortening the working process and improving the workability, and using the true pillar. The purpose is to provide an underground construction method.

[0007]

To this end, the Yatco dual-purpose true column of the present invention has a connecting member fixed to the lower portion of the true column.
The structure column is fixed to the upper portion of the steel pipe pile through a connecting member.

Further, in the underground construction method of the present invention using the structural columns, after constructing the mountain retaining wall, steel pipe piles are embedded by using the Yatco combined structural columns according to claim 1, and then the first floor is constructed. After construction, the lower part of the first floor is cut off, and then concrete is placed on the upper part of the steel pipe pile and the lower part of the structure column.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show an embodiment of a Yatco double-use true column and an underground construction method using the true column of the present invention. FIG. 1 is a perspective view of the true column, and FIG. 2 is a sectional view after construction. FIG. 3 is a perspective view for explaining an example of an underground construction method to which the present invention is applied.

In FIG. 1, slightly above the lowermost end of the true column 6, four connecting members 1 are formed on the four side faces forming the H-shaped steel.
0 is fixed by welding. The connecting member 10 is a horizontal member 10a made of H-shaped steel, a mounting plate 10b fixed to the tip of the horizontal member 10a by welding, and a mounting plate 1
0b formed in the bolt hole 10c. Further, the structure column 6 is provided with a plurality of studs 11 for connecting concrete below the connecting member 10. Note that 12
Is a fixed plate having a bolt hole 12a.

The true column 6 to which the connecting member 10 is fixed as described above is inserted into the upper portion of the steel pipe pile 9 as shown in FIG. A bolt hole is formed in the upper part of the steel pipe pile 9 so as to face the bolt hole 10c of the mounting plate 10b of the connection member 10, and the fixing plate 12 is brought into contact with the outer periphery of the steel pipe pile 9
The steel pipe pile 9 is fixed to the lower part of the true column 6 by tightening and fixing it with the bolt 13.

The underground construction method according to the present invention using the structured pillar having the above structure will be described with reference to FIG. First, mountain retaining wall 1
, And arrange the structure columns 6 having the steel pipe piles 9 at the bottom,
The structure pillar 6 is hit with a diesel hammer, and the steel pipe pile 9
Is embedded to a predetermined depth. Next, the excavation machine 2 excavates the beam to the bottom of the first floor, assembles the first beam 3 made of steel, and then constructs a part of the first floor 4. Next, after excavating the excavating machine 2 on the first floor 4 and cutting the lower part of the first floor 4, concrete 14 (see FIG. 2) is placed on the upper part of the steel pipe pile 9 and the lower part of the structural column 6. Then, the steel pipe pile 9 and the structure column 6 are integrated. Also, the steel pipe pile 9 is used as a pillar to form the mat slab 7
To build. Finally, the outer wall 8 and pillars are cast into concrete to complete the basement building.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, as the structure pillar 6, in addition to the steel frame,
A steel pipe, a steel pipe concrete, a centrifugal molding PC, etc. can be adopted, and the shape of the connecting member 10 is not limited to the above-mentioned embodiment, and in short, any shape that can be fixed to the steel pipe pile 9 may be used. Further, a foundation beam may be adopted instead of the mat slab 7.

Further, in the above embodiment, the structure columns are applied to the underground construction method for constructing the basement floor after constructing the first floor shown in FIG. It can also be applied to construction methods.

[0015]

As is apparent from the above description, according to the present invention, the conventional Yatco is not required due to the structure in which the structural column is connected to the upper portion of the steel pipe pile, so that the working process is shortened and the workability is improved. Can be improved. Further, when the structural pillar of the present invention is applied to an underground construction method for constructing a basement floor after constructing a first floor, the construction period can be further shortened.

[Brief description of drawings]

FIG. 1 is a perspective view of a true-line column showing an embodiment of a Yatco dual-purpose true-column and an underground construction method using the true-line column of the present invention.

FIG. 2 is a cross-sectional view after construction showing one embodiment of the Yatco dual-purpose true column and the underground construction method using the true column of the present invention.

FIG. 3 is a perspective view for explaining an example of an underground construction method to which the present invention is applied.

[Explanation of symbols]

1 ... Mountain retaining wall, 4 ... 1st floor, 6 ... True pillar, 9 ... Steel pipe pile,
10 ... Connection member 14 ... Concrete

Claims (2)

[Claims] 1. A Yatco dual-purpose true column, wherein a connecting member is fixed to a lower portion of the true column, and the true column is fixed to an upper portion of a steel pipe pile through the connecting member. 2. After constructing a mountain retaining wall, a steel pipe pile is embedded by using the Yatco double-purpose column of claim 1, and then 1
An underground construction method characterized by constructing a floor, cutting the lower part of the first floor, and then placing concrete on the upper part of the steel pipe pile and the lower part of the structure column.