JP2002105973A - Pillar construction method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method for economically constructing a plurality of columns adjacent to each other at a close position while using temporary timber pillars. SOLUTION: This is a method of constructing a pillar in which a plurality of pillars adjacent to each other are erected on one pile 1, and is located at an upper part of the pile 1 at an intermediate portion of the plurality of pillars to be erected. One temporary pillar 2 is erected, and the excavation hole used for the construction of the pile 1 is backfilled.
, A plurality of pillar bodies 20 are built by supporting the temporary receiving jig 10, and then the ground below the pillar bodies 20 is piled 1.
After the root is cut, the extension column 26 is connected to the lower end of each column main body 20, and the lower end of the extension column 26 is fixed to the footing 31 constructed on the pile 1.

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 column in which a plurality of columns adjacent to each other are erected on a single pile by using a temporary timber column.

[0002]

2. Description of the Related Art For example, as a method of constructing an underground part or an underground structure of a high-rise building, a drilling hole is formed in the ground to form a pile, and at the top of the pile, a straight pillar (an upper half of the building is used). After installing a steel column that is used as a permanent pillar on the basement floor and the lower half is used as a pile), the excavation hole is once back filled with earth and sand using a backhoe, etc. It is known to construct a basement or underground structure by attaching a permanent steel beam that constitutes the basement or underground structure from the top to the bottom while mounting the steel beam on the vertical column, from the top to the bottom. I have.

[0003] In a construction site where a group of columns of a building is constructed using such straight columns, a plurality of columns adjacent to each other at close positions may be constructed. FIG. 10 shows an example of a planar layout of a column group at such a site. In the region indicated by H, the two columns A and B are adjacent columns at close positions.

Conventionally, when two columns A and B adjacent to each other at such a close position are to be constructed, a pile is provided for each column and a straight pillar is erected, or the diameter of the pile is increased to make one pillar. Two pillars are built on the pile.

[0005]

SUMMARY OF THE INVENTION However, the above-mentioned conventional 2
Each of the two methods has a problem that the cost increases.

The present invention has been made in view of the above circumstances, and has an object to provide a method of economically constructing a plurality of pillars adjacent to each other at a close position while using temporary timber pillars. .

[0007]

According to the first aspect of the present invention, there is provided a method of constructing a plurality of pillars adjacent to each other on a single pile, and a method of constructing the pillar on an upper part of the pile. After constructing one temporary timber column located in the middle of the plurality of pillars and backfilling the excavation hole used for the pile construction and performing primary root cutting, Attach a temporary receiving jig to the upper end,
Supporting the temporary jig, erected multiple pillar bodies,
Next, the ground below the pillar body is cut down to the upper end of the pile, and after the root cut, the lower end of each pillar body is connected to the pillar, and the lower end of the added pillar is fixed to the foundation concrete constructed on the pile. And

According to a second aspect of the present invention, in the first aspect, after the temporary timber pillar is erected, the excavation hole used for the construction of the pile is backfilled, the primary root is cut, and then the primary root is cut. A temporary base is formed on the surface of the ground, and when the pillar body is erected, the pillar body is supported by a temporary receiving jig while the level of the pillar body is adjusted by the temporary base, and then the ground below the pillar body is formed. It is characterized in that the temporary base is removed when the root is cut off.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In this construction method, when erecting a plurality of columns (two columns A and B in this embodiment) adjacent to each other, first, as shown in FIG.
An earth drill pile 1 is constructed in the middle of the pile, and a temporary structural pillar 2 made of one steel frame material is placed on the upper part of the pile 1 in the middle of the two pillars A and B to be erected. After the temporary pillar 2 is erected, the excavation hole 3 used for the construction of the pile 1 is backfilled. Then, as shown in FIG. 1B, the primary root cutting is performed to a predetermined height above the B1 level (B1FL).

Then, as shown in FIG. 2, a temporary base 7 is formed on the surface of the ground where the primary root has been cut, and the upper part of the temporary structural pillar 2 is cut at a predetermined height. The plate 5 is attached to the upper end of the column 2 by welding. Then, as shown in FIG. 3, the temporary receiving jig 10 is attached to the upper end of the temporary structural pillar 2 while adjusting the level with a liner plate or the like.

As shown in FIGS. 9 (a) and 9 (b), the temporary receiving jig 10 is provided with two temporary horizontal receiving beams 12 orthogonal to each other at both upper ends of a temporary vertical receiving beam 11. , Temporary vertical support 11
Is fixed to the plate 5 with the clamp member 15 so as to be attached to the upper end of the temporary structural pillar 2. And
In this state, the beam joint bracket 21 provided on the column body 20
, The column main body 20 can be temporarily received.

After the temporary receiving jig 10 is attached to the upper end of the temporary timber pillar 2, as shown in FIG. 4, the temporary receiving jig 10 is supported and the two pillar bodies 20 are positioned and installed. .
At that time, by inserting the wedge 8 etc. on the temporary base 7,
The level adjustment of the pillar body 20 is performed, and the temporary receiving jig 10 and the pillar body 20 are fixed with the clamp member in the adjusted state.

After the column body 20 is fixed to the temporary receiving jig 10, the column body 20 is connected to another adjacent column (not shown) by a permanent beam 25 as shown in FIG. In addition, before the secondary root cutting, the vicinity of the lower end of the pillar body 20 is temporarily fixed to the temporary structural true pillar 2 using a single pipe (temporary material) 9.

Then, in this state, as shown in FIG.
Secondary ground excavation is performed on the ground below the column main body 20 to a position where the upper end of the pile 1 is exposed (the temporary base 7 is removed at the time of the secondary excision). (Post-base steel frame) 26 is joined to the lower end of the base using a high tension bolt. In the figure, reference numeral 28 denotes a joint.

An anchor 2 is provided at the lower end of the extension column 26.
7 and formwork and concrete casting, and as shown in FIG. 7, a foundation beam 30 and a footing (foundation concrete) 31 are constructed, and
6 is fixed at the lower end.

Thereafter, the unnecessary temporary structural pillar 2 is cut off and removed, and two pillars (the pillar body 20 and the extension pillar 26) are erected on one pile 1 as shown in FIG. The installed structure is completed. If necessary, the temporary column 2 can be used for other purposes without being removed.

In the above embodiment, the case where two pillars are erected on one pile has been described, but three or more pillars may be erected.

[0018]

As described above, according to the first aspect of the present invention, a plurality of pillars are erected on one pile while using the temporary timber pillars, so that the pillars can be easily formed with high accuracy. Construction can be performed, and costs can be reduced.

Further, if the leveling is performed by using the temporary base as in the second aspect of the present invention, the construction accuracy of the pillar can be further improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first step of a construction method according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a step subsequent to FIG. 1;

FIG. 3 is a side sectional view showing a step subsequent to FIG. 2;

FIG. 4 is a side sectional view showing a step subsequent to FIG. 3;

FIG. 5 is a side sectional view showing a step subsequent to FIG. 4;

FIG. 6 is a side sectional view showing a step subsequent to FIG. 5;

FIG. 7 is a side sectional view showing a step subsequent to FIG. 6;

FIG. 8 is a side sectional view showing a step subsequent to FIG. 7;

FIG. 9 is a side view showing the completed structure.

FIG. 10 is a plan layout view of a column group at a construction target site according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile 2 Temporary construction straight pillar 3 Drilling hole 7 Temporary base 10 Temporary receiving jig 20 Pillar main body 26 Supplementary pillar 31 Footing (foundation concrete)

Claims (2)

[Claims] 1. A method for constructing a plurality of pillars adjacent to each other on a single pile, comprising: an intermediate portion of the plurality of pillars to be erected on an upper part of the pile. And constructing one temporary timber column, backfilling the excavation hole used for the pile construction, performing primary root cutting, and attaching a temporary receiving jig to the upper end of the temporary timber column. A plurality of pillar bodies are erected by supporting the temporary receiving jig, then the ground below the pillar bodies is cut off to the upper end of the pile, and after the root cut, the pillars are connected to the lower ends of the pillar bodies. And fixing the lower end of the additional pillar to the foundation concrete constructed on the pile. 2. After the temporary timber pillar is erected, the excavation hole used for the construction of the pile is backfilled, the primary root is cut, and a temporary base is formed on the surface of the ground after the primary root cut. In building the pillar body, the pillar body is supported by the temporary receiving jig while adjusting the level of the pillar body by the temporary base, and then the temporary base is removed when the ground below the pillar body is cut off. The method according to claim 1, wherein: