JPH06129189A - Segment-based vertical column construction method - Google Patents

Abstract

PURPOSE:To make it possible to construct a vertical column in a relatively short period. CONSTITUTION:A segment 12 is assembled inside an underground continuous wall 7 along the internal circumference of the underground continuous wall. After a last-drive anchor is placed from a backfilling inlet of the segment 12, a backfilling material is injected between the underground continuous wall 7 and the segment 12 from the backfilling inlet, thereby constructing a shaft 10. This construction makes it possible to omit such processes as reinforcing bar assembling, form work and concrete cast work. What is more, no noncrete curing period is required, which makes it possible to shorten construction period dramatically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft construction method using a segment suitable for constructing a deep vertical shaft for a production facility or a vertical shaft for a shield which utilizes gravity.

[0002]

2. Description of the Related Art Conventionally, as an example of a construction method for constructing a shaft with a large depth as described above, a method in which an underground continuous wall and an RC reverse winding method are combined is known. This method is
After constructing a cylindrical underground continuous wall in the ground, excavate the head of the underground continuous wall and place concrete in this part annularly to form a coping having the same inner diameter as the vertical shaft to be constructed. After constructing and then excavating the inside of the underground continuous wall to a predetermined depth, rebar assembly is performed in the excavation hole and a slide type mold is inserted, and between the form and the underground continuous wall. Repeat the steps of placing concrete into the concrete, excavating again to the specified depth, lowering the slide formwork, and placing concrete between the formwork and the underground continuous wall to the specified depth. Then, the vertical shaft is excavated and finally the bottom plate is constructed to construct the shaft.

[0003]

However, in the above construction method, when the inner space of the vertical shaft to be constructed is narrow, only excavation is performed during excavation, only reinforcing bar is assembled during rebar assembly, and only concrete pouring is performed during concrete pouring. Since it was not possible to use both the construction work and the construction work, and the concrete curing period was required, it took a long construction period to construct the shaft. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shaft construction method using a segment that can construct a shaft in a relatively short period of time.

[0004]

In order to achieve the above object, a vertical shaft construction method utilizing the segment of the present invention is
After excavating the inside of the cylindrical underground continuous wall, assemble the segment inside the underground continuous wall along the inner circumference of the underground continuous wall, and then punch the post-strike anchor from the backfill inlet of the segment. After the installation, the backfill material is injected from the backfill inlet between the underground continuous wall and the segment.

[0005]

In the vertical shaft construction method using the segment of the present invention, since the vertical shaft is constructed by the segment inside the underground wall, the rebar assembly, formwork and concrete placing steps in the conventional method are omitted. In addition, unlike the conventional method, the concrete curing period is not required, so that the construction period can be significantly shortened. Further, the segment is supported by a post-driving anchor that is driven from a backfill inlet provided in the segment and a backfill material injected from the backfill inlet between the underground continuous wall and the segment. Therefore, the segment can be easily and reliably supported by the underground continuous wall.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vertical shaft construction method utilizing the segment of the present invention will be described below with reference to FIGS. First, as shown in FIG. 3, the improved body 1 is constructed by improving the ground inside and outside the underground continuous wall to be constructed by the SMW method or the like. Next, as shown in FIG. 4, the head of the improvement 1 is excavated to construct the guide wall 2 and the working floor 3 in this portion.

Next, as shown in FIG.
An EM excavator 4 is used to excavate the space, a rebar cage 5 is then installed in this excavation hole, and concrete is then poured into the excavation hole using a tremie pipe 6 to construct an underground continuous wall 7. As shown in FIG. 1, this underground continuous wall 7 is formed by arranging 12 continuous wall pieces 7a in a substantially cylindrical shape, and a shaft 10 is constructed inside these. Next, as shown in FIG. 6, the head of the underground continuous wall 7 is excavated, and concrete is annularly cast in this part to construct a coping 8 having an inner diameter equal to that of the vertical shaft 10 to be constructed. To do.

Next, as shown in FIG. 7, the underground continuous wall 7
An excavation hole is formed inside the underground wall 7 by excavating the excavated soil by a bucket while excavating the inside of the excavator to a predetermined depth (about 6 m). After that, as shown in FIG. 8, the scaffold 11 with the segment assembling device is installed in the excavation hole excavated by a predetermined depth, and the side walls 13 are constructed by attaching the segments 12 ... As shown in FIGS. 1 and 2, the attachment of the segments 12 ...
Assemble a predetermined number of segments 12 ... in the circumferential direction of
The segments 12 that are adjacent to each other in the circumferential direction are connected to each other by an inter-ring bolt 14, and the underground continuous wall 7
Assemble a predetermined number of segments 12 ... in the axial direction of
This is performed by connecting the segments 12, 12 that are axially adjacent to each other with an inter-segment bolt 15. In this way, by connecting the segments 12 in the circumferential direction and the axial direction of the underground continuous wall 7 to ensure the integrity, the side wall 13 that can sufficiently resist the external force of earth and water pressure and the seismic force.
Can be built.

Next, after the post-driving anchors 16 ... Are struck from the back-filling injection ports provided at several places in the one segment 12 until they reach the underground continuous wall 7, as shown in FIG. The self-weight of the side wall 13 is supported by injecting a back-filling material (mortar) 17 between the underground continuous wall 7 and the side wall 13 from the back-filling inlet. When the post-strike anchor 16 is driven, the reinforcing bar 18 may be inserted in advance because the reinforcing bar of the underground continuous wall 7 may be cut (see FIG. 2).

Then, the steps described above are repeated up to a predetermined depth, and finally, as shown in FIG. 10, flooring excavation is performed to construct the bottom plate 19 to complete the construction of the vertical shaft 10.

However, according to the vertical shaft construction method utilizing the above segment, the rebar assembly in the conventional construction method,
Formwork and concrete pouring process are omitted, concrete or steel segment 12 of precast material is used, and transportation and assembly work of segment 12 are changed, and concrete curing period is not required as in the past. So
The construction period can be greatly shortened, and in particular, when the inner space of the vertical shaft to be constructed is narrow, the conventional processes such as rebar assembly, formwork and concrete placing that cannot be used together are omitted. Therefore, the effect of shortening the construction period becomes large. By the way, in the case of constructing a vertical shaft with an inner diameter of 7 m and a depth of 100 m, the construction period of excavation construction work was able to be shortened significantly by about 6 months compared with the underground continuous wall RC reverse winding construction method (conventional method).

Further, after the segments 12 are assembled to construct the side wall 13, a post-strike anchor is driven from the backfill injection port provided in the segment 12, and the continuous underground wall 7 and the side wall are formed from the injection port. Since the backing material is filled in between, the side wall 13 constituted by the segments 12 ... Can be easily and reliably supported by the underground continuous wall 7, and thus the safety of the construction work of the vertical shaft 10 is also improved. high.

[0013]

As described above, according to the vertical shaft construction method using the segment of the present invention, the segment is assembled inside the underground continuous wall along the inner circumference of the underground continuous wall, and then the segment is assembled. Since a vertical shaft was constructed by injecting a backfill material between the underground continuous wall and the segment from the backfill inlet after placing a post-casting anchor from the backfill inlet. Since the steps of assembling the rebar, the formwork, and the concrete placing step in the construction method can be omitted, and since the concrete curing period is not required unlike the conventional method, the construction period can be shortened significantly.

After assembling the segment, a post-casting anchor is driven from a backfill injection port provided in the segment, and a backfill material is filled from the injection port between the underground continuous wall and the segment. As a result, the segment can be easily and surely supported by the underground wall, and thus the safety of the shaft construction work is high.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vertical shaft constructed by the method of the present invention.

FIG. 2 is a vertical view of a vertical shaft constructed by the method of the present invention.

FIG. 3 is a vertical cross-sectional view showing a state in which ground improvement inside and outside the underground continuous wall to be constructed is performed.

FIG. 4 is a vertical cross-sectional view showing a state where a guide wall is built on the head of the improved body.

FIG. 5 is a vertical cross-sectional view showing a state where an underground continuous wall is constructed.

FIG. 6 is a vertical cross-sectional view showing a state in which a coping is constructed on the head of the underground continuous wall.

FIG. 7 is a vertical cross-sectional view showing a state where an excavation hole is formed inside a continuous underground wall.

FIG. 8 is a vertical cross-sectional view showing a state where a segment is attached.

FIG. 9 is a vertical cross-sectional view showing a state where a backfill material is being injected.

FIG. 10 is a vertical sectional view showing the constructed vertical shaft.

[Explanation of symbols]

 7 Underground continuous wall 10 Vertical shaft 12 Segment 13 Side wall 16 Post-cast anchor 17 Backfill material

Claims (1)

[Claims] 1. After excavating the inside of a cylindrical continuous underground wall,
A segment is assembled inside the underground continuous wall along the inner circumference of the underground continuous wall, and a post-strike anchor is driven from the backfill injection port of the segment, and then the underground continuation is performed from the backfill injection port. Vertical shaft construction method using segments, characterized by injecting backfill material between the wall and the segment.