JPH06299562A - Method for constructing underground body - Google Patents

Abstract

PURPOSE:To improve the quality of an earth retaining wall and shorten the construction period thereof by a method wherein cement milk is poured into earth and sand in a continuous excavated hole to be mixed therewith and thereafter PC earth retaining wall members are successively installed, and after the curing of the cement milk, a form is fixed to the members and concrete is placed to form a body. CONSTITUTION:Cement milk is poured into a row of continuously excavated holes to be mixed and stirred with earth and sand therein, and PC earth retaining wall members 10 are erected in the holes to form a wall. After a mixture of the cement milk is cured, a sheet for curing 13 adhered to the front surfaces of the members 10 is separated and forms for forming a body are fixed by using screw holes 12 for a separator and concrete is placed into the forms and the forms are removed after the concrete is cured, whereby the members 10 are made integral to the body. As a result, the quality of the earth retaining wall is improved and construction work can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an application of an underground wall construction method, and relates to an underground rectangular structure construction method using a PC plate.

[0002]

2. Description of the Related Art Utilizing a conventional concrete underground wall,
When constructing an underground rectangular body, first use a stabilizing solution such as bentonite muddy water to continuously excavate a groove of a specified width in the ground, build a reinforced cage in it, and then place concrete. . In some cases, underground rectangular bodies were constructed using the continuous underground wall constructed in this way.

[0003]

However, in the conventional method of constructing a concrete underground wall as described above,
A high level of construction management was required for the work of replacing the stabilizing liquid in the underground trench with ready-mixed concrete and the work of inserting the reinforcing steel cage. In other words, there is a drawback that quality will vary if high-level construction management is not performed. Furthermore, when constructing an underground rectangular parallelepiped using such a mountain retaining wall, excavation and surface treatment were difficult.

The object of the present invention is to solve the problems of the conventional method of constructing an underground rectangular body using such a mountain retaining wall, to use a PC mountain retaining wall having a connectable shape, and to mount it on the surface of the PC retaining plate. An object of the present invention is to provide an underground rectangular structure construction method in which the adhered curing sheet is removed before excavation to facilitate excavation and a form tie is attached to the separator screw hole to easily assemble the formwork.

[0005]

In order to achieve the above object, the underground rectangular body construction method of the present invention is a step of forming a continuous hole row in the ground by an excavating machine so as to partially overlap adjacent holes. And a step of adding cement milk to the row of holes and mixing and stirring it with the soil in situ, and a step of successively stacking and connecting PC mountain retaining wall members while stirring the cement milk and soil,
After the mixture of the cement milk and soil is hardened, a step of peeling the curing sheet attached to the front surface of the PC mountain retaining wall member to construct a PC mountain retaining wall, and a front wall of the constructed PC mountain retaining wall Screw the foam tie into the screw hole for the separator formed in
From the step of fixing the form at a position distant from the PC retaining wall, the step of placing concrete in the formed form, and the step of removing the form after the placed concrete has hardened. It is characterized by

[0006]

In the method for constructing an underground rectangular body according to the present invention, since the underground rectangular body is constructed by using the PC mountain retaining wall, excavation is easy, and the excavation surface can be cleanly constructed by the curing sheet.

[0007]

[Embodiment] The construction method of underground rectangular body of the present invention will be described below.
A description will be given with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing a PC mountain retaining wall member used in the underground rectangular structure construction method of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof. Here, a hanging hook 11 is attached to the upper end of the PC mountain retaining wall member 10. A plurality of separator screw holes 12 are formed on the surface portion, and a curing sheet 13 is attached. At one end of the PC mountain retaining wall member 10, there is formed a recess 10a for sequentially overlapping and connecting. Furthermore, on the back side, there is a rib 1 for reinforcement.
0b is erected.

4 to 7 are explanatory views showing an embodiment of the method for constructing an underground rectangular body of the present invention. Here, first, a hole row 14 that is continuous in the ground is partially overlapped with an adjacent hole while pouring a stabilizing liquid by an excavating machine such as an earth auger (not shown). Next, cement milk is put into the hole array 14 and mixed and stirred with the soil at the original position to replace the stabilizing liquid.

While cement milk and soil are stirred, PC mountain retaining wall members are successively stacked and connected to form a continuous wall.
At this time, as shown in FIG. 4, the wire 15 of the crane is attached to the hanging hook 11 provided on the upper surface of the PC mountain retaining wall member 10.
Multiply Further, a temporary hook 16 for attitude control is screwed into one of the screw holes 12 for the separator formed on the surface of the PC mountain retaining wall member 10, and a wire 17 is laid over the recessed portion of the PC mountain retaining wall member. The corner of the next PC mountain retaining wall member overlaps 10a (see FIGS. 4 and 5).

After the mixture of the cement milk and the soil is hardened, the curing sheet 13 attached to the front surface of the PC mountain retaining wall member 10 is peeled off to construct a PC mountain retaining wall (see FIG. 6). A foam tie 18 is screwed into the screw hole 12 for the separator arranged on the front wall of the PC mountain retaining wall thus constructed, and the form 19 is fixed at a position apart from the PC mountain retaining wall by a predetermined position ( (See FIG. 8). Then, concrete 20 is placed in the formed formwork 19. Furthermore, after the cast concrete 20 is hardened, the formwork is removed to construct an underground rectangular body.

In this way, after the PC mountain retaining wall is constructed, the underground wall is constructed using the wall surface of, so that the construction period can be shortened and the quality of the mountain retaining wall can be improved.
Moreover, since the surface of the mountain retaining wall only needs to be peeled off the curing sheet 13, the work is easy and the surface can be finished neatly.

FIGS. 9 and 10 explain the case where the PC mountain retaining wall member 10 is added. When the dimension of the PC mountain retaining wall member 10 is short, the joint metal piece 23 is attached to the upper portion of the member, and the PC mountain retaining wall member 10-1 having the joint recess 10-2 is connected to the lower end thereof. As shown in FIG. 9, a joint metal piece 23 may be used for attachment and the belly-raising member 22 may be arranged.

In this case, the strength of the mountain retaining wall can be increased and a deeper mountain retaining wall can be manufactured.

FIG. 11 is an explanatory view showing an embodiment in which the inside corner A and the outside corner B are constructed by the underground rectangular body construction method of the present invention. Here, when constructing the entry corner A, the PC Yamadome wall member 1
The leading end portion of the next PC mountain retaining wall member 10 is disposed in the 0 recessed portion 10a so as to be orthogonal. With this arrangement, a right angled corner A is constructed. Further, when constructing the projected corner B, the PC mountain retaining wall member 10-3 dedicated to the projected corner is used, and the next PC mountain retaining wall member 10 is connected so as to project at a right angle. In this way, the projected corner B can be constructed by disposing the PC mountain retaining wall members 10-3 and 10.

The method for constructing an underground rectangular body of the present invention is not limited to the above embodiment, and various modifications can be made based on the technical idea of the present invention.

[0016]

As described above, in the underground rectangular body construction method of the present invention, a step of forming a continuous hole row in the ground by an excavating machine so as to partially overlap adjacent holes, and the hole row A step of adding cement milk and mixing and stirring it with in-situ soil; a step of sequentially stacking and connecting PC mountain retaining wall members while stirring the cement milk and soil; and a mixture of the cement milk and soil After curing, the step of peeling off the curing sheet attached to the front surface of the PC mountain retaining wall member to construct the PC mountain retaining wall, and the screw hole for the separator formed in the front wall of the constructed PC mountain retaining wall After the form tie is screwed to the PC and the mold is fixed at a position separated from the PC mountain retaining wall by a predetermined position, the concrete is cast in the formed mold, and after the cast concrete is hardened. Since it consists of the process of removing the formwork, the construction period is short. Along with the attempt to, it is possible to improve the quality of the earth retaining wall. In addition, the curing sheet can be used not only for curing PC concrete but also for removing it by excavating it easily and cleanly. Further, if the wires are tied together by using the insert of the formwork separator, the positioning at the time of assembling becomes easy.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a PC mountain retaining wall member used in an underground rectangular structure construction method of the present invention.

FIG. 2 is a plan view showing a PC mountain retaining wall member used in the underground rectangular structure construction method of the present invention.

FIG. 3 is a front view showing a PC mountain retaining wall member used in the underground rectangular structure construction method of the present invention.

FIG. 4 is an explanatory view showing an example of an underground rectangular body construction method of the present invention.

FIG. 5 is an explanatory diagram showing an example of an underground rectangular body construction method of the present invention.

FIG. 6 is an explanatory view showing an embodiment of the underground rectangular body construction method of the present invention.

FIG. 7 is an explanatory view showing an example of an underground rectangular body construction method of the present invention.

FIG. 8 is an explanatory view showing an example of an underground rectangular body construction method of the present invention.

FIG. 9 is an explanatory diagram showing an example of an underground rectangular body construction method according to the present invention.

FIG. 10 is an explanatory view showing an example of an underground rectangular body construction method of the present invention.

FIG. 11 is an entrance corner A and an exit corner B in the underground rectangular structure construction method of the present invention.
It is explanatory drawing which shows the Example at the time of constructing.

[Explanation of symbols]

 10 PC Yamadome Wall Member 10-1 PC Yamadome Wall Member 10-2 Joint Recess 10-3 Outer Corner PC Yamadome Wall Member 10a Recess 10b Rib 11 Hanging Hook 12 Separator Screw Hole 13 Curing Sheet 14 Hole Row 15 Wire 16 Temporary hook 17 Wire 18 Form tie 19 Formwork 20 Concrete 21 Bracket 22 Raised material 23 Joint hardware

Claims (1)

[Claims] 1. A step of forming a continuous row of holes in the ground by an excavating machine so as to partially overlap adjacent holes, and a step of adding cement milk to the row of rows and mixing and stirring with soil in situ. A step of successively stacking and connecting PC cement retaining wall members while stirring the cement milk and soil, and after adhering the mixture of the cement milk and soil, pasting on the front surface of the PC mountain retaining wall members. A step of peeling off the curing sheet to construct a PC mountain retaining wall, and a form tie is screwed into a screw hole for a separator formed on the front wall of the constructed PC mountain retaining wall, and is separated from the PC mountain retaining wall at a predetermined position Characterized by the following steps: fixing the formwork at a fixed position, placing concrete in the formed formwork, and removing the formwork after the placed concrete is hardened. Body construction method.