JP2002194758A - Structure of replacement part of middle pile and replacement method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a structure of a replacement part of an intermediate pile and a replacement method capable of shortening a construction period. SOLUTION: An embedding tool 3 is arranged at a position where an intermediate pile 2 penetrating an underground structure 10 of a multi-story floor intersects a middle floor slab 5. The burying tool is composed of a plurality of plates 31 attached to the intermediate pile so as to be orthogonal to the intermediate pile, and a number of fixing rods 32 attached to this plate. Concrete is poured into the middle floor slab, the burying tool is embedded in the middle floor slab, and integrated, and after the concrete curing, the lower intermediate pile is cut from the middle floor slab.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a method of replacing an intermediate pile, and particularly to a method for opening a lower floor at an early stage when constructing an underground station building having three underground layers. The present invention relates to a structure of a replacement portion of a middle pile when a middle pile is cut and a replacement method.

[0002]

2. Description of the Related Art When constructing an underground building, in particular, an underground station building with three basements, the construction period until the opening of the station building is limited. Need to hand over to mechanical construction. In general, in underground work such as an underground station building having three basements, an excavation is performed to a predetermined depth to perform a foundation work, and then the building is sequentially constructed from a lower floor to an upper floor. Here, an intermediate pile is installed to support the lining plate on the ground surface and to use it for receiving the girder. For this reason, it is necessary to cut the intermediate pile while replacing the intermediate pile, remove it, and then perform construction work and mechanical work on the lower floor. As shown in FIG. 5 and FIG. 6, the conventional replacement method is to install a middle girder on a middle floor slab a with steel beams b1 and b2 and further incorporate a built-up material b3.
Had gone. That is, after the curing of the concrete of the middle floor slab a is completed, the installation of the steel pipe columns using the special carriage for transporting the steel pipe columns on the middle floor slab a, the installation of the precast concrete wall form d using the mini crane, Heavy objects are installed by heavy equipment such as installation of a precast concrete suspension form f for an upper floor slab using a handling machine e. Thereafter, the installation type intermediate pile replacement work b was performed on the middle floor slab a, the intermediate pile c was continuously cut at the location of the installation type intermediate pile replacement work b, and the lower floor intermediate pile c was removed.

[0003]

However, the above-mentioned conventional replacement method has the following problems. <B> The size of the installation type intermediate pile replacement b, which is to be installed by crossing the girder, is 2 meters square, so that heavy machinery used for the installation of steel pipe columns and precast concrete wall formwork d on the upper floor, etc. Inhibit. Therefore, as described above, it is necessary to complete all heavy equipment work on the upper floor before installing the installation type intermediate pile replacement b, and the lower floor can be opened until the construction on the upper floor is completed. Did not. <B> After the construction on the upper floor is completed as described above, the intermediate pile c is cut and removed, the lower floor is opened, and construction work and mechanical work are performed. Was getting longer. <C> A large-scale girder is assembled with steel materials b1 and b2, and a built-up material b3 is also incorporated to replace the installation type intermediate pile b.
And it was costly.

[0004]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned conventional problems, and provides a structure and a method for replacing a middle pile which can shorten a construction period. The purpose is to: Another object of the present invention is to provide a structure of a replacement part of an intermediate pile and a replacement method which are inexpensive and reduce material costs. The present invention achieves at least one of the above objects.

[0005]

In order to achieve the above object, the structure of the replacement part of the intermediate pile of the present invention is a method of replacing the intermediate pile when constructing a multi-story underground structure. , An intermediate pile penetrating an underground structure of a multi-story floor, and an embedding tool disposed at a position where the intermediate pile and the intermediate floor slab intersect, wherein the embedding tool is orthogonal to the intermediate pile. And a plurality of fixing rods attached to the plate, and the embedding tool is embedded in the middle floor slab and integrated. With the above configuration, if the curing of the concrete of the middle floor slab is completed, the middle pile can be cut and removed to open the lower floor, regardless of the construction of the upper floor. The method for replacing an intermediate pile according to the present invention is a replacement method using the structure of the replacement part of the intermediate pile described above, wherein a plurality of plates are orthogonal to the intermediate pile penetrating the middle floor slab. Before or after attaching the plate to the intermediate pile, a large number of anchoring rods are attached to the plate, concrete is poured into the intermediate floor slab, and the plate and anchoring rod are embedded in the intermediate floor slab. Unite,
After the concrete curing, the lower intermediate pile is cut from the middle floor slab.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

<A> Overall Configuration The replacement unit is configured by arranging the burying tool 3 at a position where the intermediate pile 2 and the intermediate floor slab 5 intersect. Intermediate pile 2 at the intersection
And the intermediate pile 2 and the burying tool 3 are integrated with the middle floor slab 5 by casting concrete. That is, after the formwork of the middle floor slab 5 is installed, the intermediate pile 2
The embedding tool 3 attached to the slab 5 is embedded in the middle floor slab 5 to form a buried-type intermediate pile replacement part 4.

<B> Intermediate pile The intermediate pile 2 is made of H-section steel or the like. The intermediate pile 2 is installed so as to penetrate the underground structure 10 (middle floor slab 5) of the multilayered floor. The intermediate pile 2 supports the surface lining plate as before,
It is installed for use as a beam support,
As necessary, a plurality of intermediate piles 2 are installed so as to penetrate the position where the middle floor slab 5 is constructed. The embedding tool 3 is joined at a position where the intermediate pile 2 and the middle floor slab 5 intersect.

<C> Buried Tool The buried tool 3 is composed of a plurality of plates 31
It is composed of a large number of fixing rods 32 attached to one. The plate 31 is made of a rectangular steel material or the like. Plate 3
In FIG. 1, a large number of mounting holes 31a are provided at substantially regular intervals so that a large number of fixing rods 32 can be attached at substantially regular intervals. The fixing rod 32 is provided for the purpose of preventing the plate 31 from being displaced from the cast concrete. As can be seen from FIG.
It is preferable that the front end 32b is formed to have a large diameter or to be bent in a hook shape, and the rear end is provided with a male screw 32a. The external thread 32a of the fixing rod 32 is
And the nuts 34 and 35 are attached to the plate 3
2, the fixing rod 32 can be attached to the plate 31 by screwing in from both sides and tightening the plate 31 (FIG. 2).
reference). Further, the fixing rod 32 can be directly attached to the plate 31 by a method such as stud welding. Thus, a large number of fixing rods 32 are attached to the plate 31. Although only three fixing rods 32 are shown on one plate 31 in FIG. 2, the number of fixing rods 32 to be arranged is a matter of design, and any number can be selected.

Plate 3 on which a number of fixing rods 32 are mounted
1 are integrally joined by welding or the like at a position where the intermediate pile 2 intersects with the middle floor slab 5. As can be seen from FIG. 2, the plates 31 are joined to the intermediate pile 2 in a state where two plates 31 are orthogonal to each other in the width direction of the intermediate pile 2. Therefore, the eight plates 31 are connected to the intermediate pile 2 and installed so as to extend in two directions orthogonal to the intermediate pile 2 as a whole. Also,
Four plates 31 extend in one direction as needed.
Can be joined to the intermediate pile 2. The plate 31
Is fixed to the intermediate pile 2 and then the fixing rod 32 is attached to the plate 31.
May be attached.

By placing concrete on the middle floor slab 5 with the plate 31 attached to the intermediate pile 2,
The burying tool 3 is embedded in the middle floor slab 5 to be integrated. Therefore, the intermediate pile 2 can be supported by the middle floor slab 5 and the burying tool 3, and the lower pile 12 can be opened by cutting and removing the intermediate pile 2 on the lower floor 12. That is, the burying tool 3
Is embedded in the middle floor slab 5 to form a buried-type intermediate pile replacement unit 4. In the present invention, since the replacement part is configured by embedding the embedding tool 3 in the middle floor slab 5, even if the plate 31 is formed large, there is no problem in running the heavy machinery.

Next, a description will be given of a method of replacing an intermediate pile using the above-described replacement section in the case of constructing a subway station building.

<A> Installation of Intermediate Piles (FIG. 4) First, in order to prevent the collapse of the surrounding ground, a retaining wall 8 is constructed and retaining is performed. An intermediate pile 2 is built in the ground to be excavated. When the intermediate pile 2 is built, it is not shown,
Excavation to a predetermined depth is carried out while erection support such as cut beams and bulging is installed horizontally, and bottom slab concrete 7 is constructed. Next, the side wall concrete wall 14 of the lower floor 12 is constructed, the middle floor slab formwork 13 is installed, and reinforcing bars are arranged.

<B> Mounting of Plate (FIG. 2) Fixing rods 32 are mounted in a number of mounting holes 31a formed in the plate 31. The male screw 32a of the fixing rod 32 is inserted into the mounting hole 31a of the plate 31, and the nuts 34 and 35 are screwed in from both sides of the plate 31, and the plate 31 is tightened. By attaching the fixing rod 32 directly to the plate 31 by a method such as stud welding, the mounting hole 31a, the male screw 32a, and the nuts 34 and 35 can be omitted. The plate 31 to which a number of fixing rods 32 are attached is
Are joined together by welding or the like at the position where they intersect with the middle floor slab 5. Plates 3 each in the width direction of the intermediate pile 2
1 are joined to the intermediate pile 2 in a state of being orthogonal to each other, and eight plates 31 are installed so as to extend in two directions orthogonal to the intermediate pile 2. The fixing rod 32 may be attached to the plate 31 after the plate 31 is joined to the intermediate pile 2.

<C> Casting concrete (FIG. 3) With the plate 31 attached to the intermediate pile 2, the middle floor slab 5
Pour concrete in. The embedding tool 3 composed of the plate 31 and the fixing rod 32 attached thereto has a middle floor slab 5
Embedded in concrete and integrated with concrete. In this way, a buried-type intermediate pile replacement unit 4 in which the middle floor slab 5 and the burying tool 3 are integrated is configured, and after the intermediate pile 2 is supported by the buried-type intermediate pile replacement unit 4, the intermediate pile 2 is cut. , And the lower floor 12 is opened (see FIG. 1). After the concrete curing of the middle floor slab 5, steel pipe columns are built on the upper floor 11, precast concrete wall formwork is installed, and the shoring for the upper floor 11 slab is assembled.
Installation of wooden formwork and work continue.

<D> Removal of Intermediate Pile (FIG. 1) In the present invention, by adopting the buried type intermediate pile replacement method, if the curing of the concrete of the middle floor slab 5 is completed,
Irrespective of the work process of the upper floor 11, the intermediate pile 2 of the lower floor 12 can be cut and removed at any time.
The intermediate pile 2 is cut off at the upper part and lower part of the lower floor 12 and removed. After removing the intermediate pile 2, a platform 15 and the like are constructed on the lower floor 12. According to the present invention, the construction of the lower floor 12 and the construction of the upper floor 11 can be performed in parallel, which leads to a shortened construction period.

When the buried intermediate pile replacement method according to the present invention was carried out with a thin middle floor slab 5 having a thickness of 40 cm, the applied load of the intermediate pile 2 was almost the same as the design value (about 110 tons). Regardless, the settlement of the middle floor slab 5 was 1 mm or less, and it was found that it was harder than expected without cracks. Comparing this with the conventional installation-type intermediate pile replacement method of assembling the crossbeam, the required number of days from concrete placement of the middle floor slab 5 to the opening of the lower floor 12 is 36 days for the conventional installation-type intermediate pile replacement method. In contrast, the method for replacing a buried intermediate pile according to the present invention has a shortened construction period of 24 days and 12 days.

[0018]

According to the present invention, the structure of the replacement part of the intermediate pile and the method of replacement are as described above, and the following effects can be obtained. <A> Since the replacement part is configured by embedding the burying tool in the middle floor slab, there is no hindrance to the traveling of heavy machinery. Therefore, it is not necessary to complete all the heavy equipment work on the upper floor before constructing the intermediate pile replacement work as in the related art, and the lower floor can be opened regardless of the work on the upper floor. <B> Regardless of the construction on the upper floor as described above, once the curing of the concrete is completed, the middle pile can be cut and removed, the lower floor can be opened, and construction work and mechanical work can be performed.
The start of construction on the lower floor is hastened, and the construction period can be shortened. <C> Since the burying tool consisting of the plate and the fixing rod attached to it is simply joined to the intermediate pile and embedded in concrete and integrated, the material cost is reduced and the cost of the intermediate pile replacement part is reduced. The structure and replacement method can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory view in which an intermediate pile is replaced with an underground structure.

FIG. 2 is a plan view showing a joint state between the intermediate pile and the burying tool.

FIG. 3 is an explanatory view showing a state in which an intermediate pile and an embedding tool are embedded in an intermediate floor slab.

FIG. 4 is an explanatory view in which an intermediate pile is built in an underground structure.

FIG. 5 is an explanatory view of a conventional technique in which an intermediate pile is replaced with an underground structure.

FIG. 6 is a side view of a conventional installation type intermediate pile replacement work.

[Explanation of symbols]

 2 ... Intermediate pile 3 ... Buried tool 31 ... Plate 32 ... Fixing rod 5 ... Intermediate floor slab 10 ... Underground structure

Claims (2)

[Claims] An intermediate pile replacement method for constructing a multi-story underground structure, comprising: an intermediate pile penetrating the multi-story underground structure; and a middle pile intersected by a middle floor slab. The embedding tool comprises: a plurality of plates attached to the intermediate pile so as to be orthogonal to the intermediate pile; and a large number of anchoring rods attached to the plate. The structure of the replacement part of the intermediate pile, which is embedded in the floor slab and integrated. 2. A replacement method using the structure of a replacement portion of an intermediate pile according to claim 1, wherein a plurality of plates are attached orthogonally to the intermediate pile penetrating the middle floor slab, Before or after attaching the plate to the intermediate pile, a number of anchoring rods are attached to the plate, concrete is poured into the intermediate floor slab, and the plate and anchoring rod are embedded in the intermediate floor slab and integrated, and concrete curing is performed. A method of replacing intermediate piles, which is performed by cutting the lower intermediate pile from the middle floor slab later.