JPH0833005B2 - Construction method of soil pile row mountain retaining wall - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a pile pile mountain retaining wall.

(Prior art) When constructing an underground structure, a mountain retaining wall may be constructed with a pile pile row. The pile pile row mountain retaining wall is continuously drilled by a dedicated multi-axis drilling machine, and after mixing and stirring the original soil and cement milk to form a soil pile, a reinforcement material such as narrow width H steel is hung to be buried. It is configured by doing. Since this reinforcing material is in contact with the outer surface of the underground structure and requires high positioning accuracy, it is necessary to fix the upper part to the guide ruler, and a reinforcing material in which the ground surface and the upper end are aligned has been used.

The lateral pressure acting on the pile pile mountain retaining wall 1 becomes smaller as it goes to the upper part as shown in FIG. 5, and the bending moment becomes smaller as it goes to the upper part as shown in FIG.

(Problems to be Solved by the Invention) As described above, the soil pile row mountain retaining wall 1 has the same strength due to the improvement of the positioning accuracy and the like, although the lateral pressure and bending moment received in the upper portion are small. Since there was no choice but to build it, there was a problem that the cost increased.

An object of the present invention is to provide a method for constructing a pile pile mountain retaining wall that can economically construct a soil pile mountain retaining wall.

(Means for Solving the Problems) To explain the means of the present invention for achieving the above object, the present invention constructs a pile pile row mountain retaining wall by burying a reinforcing material in each of the soil piles of the pile pile row. In the method for constructing a pile pile mountain retaining wall, a long reinforcing material having a length corresponding to the length of the soil pile is suspended in each of the pile piles and buried in the soil pile. In the soil pile formed by burying the material, the length is shorter than that of the long reinforcing material, and the short reinforcing material is added to the upper end of the soil reinforcing material and the length compensating material is hung to hang it down. Then, when the lower end of the short reinforcing material reaches a portion having a predetermined depth, the length correction tool is removed from the short reinforcing material and pulled up.

(Operation) By selectively burying the long reinforcing material or the short reinforcing material in each soil pile in the soil pile row in this manner, the cost can be reduced as compared with the case where the long reinforcing material is buried in all the pile piles. Further, since the short length reinforcing material is additionally buried with the length correction tool on the short length reinforcing material, the positioning accuracy can be made approximately the same as that of the long length reinforcing material. Since the length correction tool is removed from the short reinforcing material and pulled up after the short reinforcing material is buried, it can be reused any number of times.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS.
This will be described in detail with reference to FIGS.

In this embodiment, continuous drilling is carried out by a dedicated machine for multi-axis drilling, and raw soil and cement milk are mixed and stirred to construct a row of soil piles 2 as shown in FIGS. 1 (A) and (B). In each of these soil piles 2, a long reinforcing material 3 made of H steel or the like having a length corresponding to the length of the soil pile 2 is suspended and buried. In the soil pile 2 in which the long reinforcing material 3 is not buried, a short reinforcing material 4 having a shorter length than the long reinforcing material 3 is added to the upper end of a length correcting tool which will be described later, and the length correcting tool side It is suspended as shown in FIG. When the lower end of the short reinforcing member 4 has bottomed on the bottom of the soil pile 2, the length correction tool is attached to the short reinforcing member 4.
Then, the pile pile row pile retaining wall 1 as shown in FIGS. 1 (A) and (B) is obtained.

2 and 3 show an example of the length correction tool 5. The length correction tool 5 is made of H steel 6 having a short length.
Of the H steel 6 are provided with slip prevention plates 7 by welding and fixing their bases and projecting their tips downward. The scale bolt 8 is rotatably and downwardly supported by a bearing 9, and a suspension hole 10 is provided at the upper end of the H steel 6. Along with this, in the short reinforcing member 4 made of H steel, the nut 11 is fixed to the upper portion of the flange surface corresponding to the long bolt 8.

Therefore, as shown in FIG. 2, the H steel 6 of the length correction tool 5 is overlapped on the upper end of the short reinforcing member 4 made of H steel, and the shift stoppers provided on both web surfaces at the lower end of the H steel 6 are prevented. Plate 7
When the long bolt 8 is turned in a state where it is positioned and aligned by sandwiching both web surfaces of the short R reinforcement 4, the tip of the long bolt 8 is screwed into the nut 11 of the short reinforcement 4, and the short reinforcement is performed. Material 4
The length corrector 5 can be connected to the.

Next, with reference to FIGS. 4A to 4D, a method of burying the short reinforcing member 4 using the length correcting tool 5 as described above will be described.

First, as shown in FIG. 2, a short reinforcing member 4 provided with a nut 11 on the upper portion is suspended in the soil pile 2 as shown in FIG. 4 (A), and a guide on the upper portion of the soil pile 2 is suspended. Temporarily fix it to the ruler 12 with the support pin 13.

In this state, as shown in FIG. 4 (B), the length correction tool 5 is hung on the upper portion of the short length reinforcing member 4 with the wire 14 and is overlapped as shown in FIG. Both web surfaces of the short reinforcing member 4 are sandwiched with 7, and the long bolt 8 of the length correcting tool 5 is turned to connect the long bolt 8 to the short reinforcing member 4.

After that, the support pin 13 is removed, and the short reinforcing material 4 and the length correction tool 5 connected to the short reinforcing material 4 are suspended by a crane as shown in FIG. 4 (D) to be buried in the soil pile 2. At this time, since the short reinforcing member 4 and the length correction tool 5 are buried while being guided by the guide ruler 12, it is possible to carry out the burial with high accuracy.

At the stage where the lower end of the short length reinforcing material 4 reaches the bottom of the formation hole of the soil pile 2 having a predetermined depth as shown in FIG. 4 (C), the long length bolt 8 of the length corrector 5 is turned backward. , The long bolt 8 is removed from the nut 11 of the short reinforcing material 4, the length correcting tool 5 is disconnected from the short reinforcing material 4, and the length correcting tool 5 is removed as shown in FIG. 4 (D). Lift the wire 14 and pull it out of the soil pile 2. Thus, the work of burying the short reinforcing member 4 is completed.

The short reinforcing material 4 as described above can reduce the length of the soil pile 2 by 10 to 30% when the length of the soil pile 2 is 10 m or more.

In the above-described embodiment, the example in which the H steel 6 is used as the length correction tool 5 has been described, but a reinforcing bar is used as the length correction tool 5, and the reinforcing bar is temporarily attached to the short length reinforcing member 4, and the reinforcing bar is It is also possible to bury it together with the short reinforcing material 4 and leave it as it is.

The length correction tool 5 can be connected to the short reinforcing member 4 by using a hook or the like.

(Effect of the invention) As described above, in the present invention, the long reinforcing material or the short reinforcing material is selectively embedded in each soil pile in the soil pile row. In comparison, resource saving and cost reduction can be achieved. Moreover, since the short length reinforcing member is additionally buried with the length correction tool on the upper portion, the positioning accuracy can be made approximately the same as that of the long length reinforcing member.

[Brief description of drawings]

1 (A) and (B) are a longitudinal sectional view and a plan view showing an example of a pile pile mountain retaining wall constructed by the method of the present invention.
FIG. 3 is a perspective view showing an example of a connecting portion between the short reinforcing member and the length correction tool used in this embodiment, and FIG. 3 is a front view showing an example of the length correction tool used in this embodiment. Figures (A)-(D)
Is a process drawing showing the step of burying the short length reinforcing material using the length corrector in this embodiment, FIG. 5 is a lateral pressure distribution map for the soil pile mountain retaining wall, and FIG. 6 is a bending moment for the soil pile mountain retaining wall. FIG. 1 …… Soil pile row mountain retaining wall, 2 …… Soil pile, 3
…… Long reinforcing material, 4 …… Short reinforcing material, 5 …… Length compensator, 6 …… H steel, 7 …… Separation prevention plate, 8 …… Long bolt for temporary fixing, 9 …… Bearing, 10 …… hanging hole, 11 …… nut, 12 …… guide ruler, 13 …… support pin, 14 …… wire.

Claims (1)

[Claims] 1. A method for constructing a pile pile mountain retaining wall by burying a reinforcing material in each soil pile of a pile pile row, wherein a pile pile mountain retaining wall construction method is used. A long reinforcing material having a length corresponding to the length of the soil pile is suspended and submerged,
In the soil pile formed by burying the long reinforcing material, a short reinforcing material having a shorter length than the long reinforcing material is added to the upper end of a length correcting tool and hung down on the length correcting tool side. The method for constructing a pile pile mountain retaining wall is characterized in that the length correcting tool is removed from the short reinforcing material and pulled up when the lower end of the short reinforcing material reaches a position of a predetermined depth.