JPH02282511A - Construction of sol pile column crest stop wall - Google Patents

Abstract

PURPOSE:To use resources effectively and to reduce the cost by employing a long reinforcement and a short reinforcement preferentially in each soil pile of a soil pile column, or by extending the short reinforcement with a size correction device on top of it, and by burying it. CONSTITUTION:Continuous drilling is performed by a multiple spindle special drilling machine, a soil and a cement mill being mixed together and stirred, so as to construct a column of a soil pile 2, and a long reinforcement 3 which is of the same length as that of the pile 2, and which is made of H-steel, is suspended in every several line among them, and is buried. Or a short reinforcement 4 which is shorter than the long reinforcement 3 is suspended and buried with a size correction device 5 put on the upper edge of it. When the lower edge of the short reinforcement 4 reaches the bottom of the soil pile 2, the size correction device 5 is extracted and is lifted, so as to construct a soil pile column crest stop wall 1. Accuracy in positioning can be the same as the case with the long reinforcement 3, and the short reinforcement material 4 can thus be used again.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for constructing a sol pile retaining wall.

(Prior Art) When constructing an underground structure, a retaining wall is sometimes constructed using rows of sol piles. The sol pile retaining wall is made by continuously drilling holes using a multi-axis drilling machine, mixing and stirring steamed and cement milk to form a sol pile, and then suspending reinforcing material such as narrow H steel and submerging it. It is composed of: This reinforcing material is in contact with the outer surface of the underground structure and requires high positioning accuracy, so it is necessary to fix the upper part to a guide ruler, so reinforcing material whose upper end is aligned with the ground surface has been used.

The lateral pressure acting on the sol pile retaining wall 1 decreases as it goes upwards, as shown in FIG. 5, and the bending moment also decreases as it goes upwards, as shown in FIG.

(Problems to be Solved by the Invention) As mentioned above, although the lateral pressure and bending moment received at the upper part of the sol pile retaining wall 1 are small, in order to improve positioning accuracy, etc., the sol pile retaining wall 1 is designed to have the same strength. Since it had no choice but to be built in

An object of the present invention is to provide a method for constructing a sol pile retaining wall that can be constructed economically.

(Means for Solving the Problems) To explain in detail the present invention for achieving the above object, the present invention constructs a sol pile retaining wall by embedding reinforcing materials in each sol pile of the sol pile row. In the construction method of a sol pile retaining wall, a long reinforcing material having a length corresponding to the length of the sol pile is suspended and buried in every few sol piles, and the long reinforcing material is suspended and buried. In the sol pile formed by immersing the material, a short reinforcing material having a length shorter than the long reinforcing material is added to the upper end of the sol pile, and a length correcting tool is added to the upper end of the reinforcing material, and the material is suspended from the side of the length correcting tool. , the length corrector is removed from the short reinforcing material and pulled up when the lower end of the short reinforcing material reaches a predetermined depth.

(Function) By selectively burying the long reinforcing material or the short reinforcing material in each sol pile in the sol pile row in this way, the cost can be reduced compared to the case where the long reinforcing material is buried in all of the sol piles. Furthermore, since the short reinforcing material is immersed with a length corrector added thereon, the positioning accuracy can be made comparable to that of the long reinforcing material. Since the length corrector 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 in detail with reference to FIG. 1 (A>(B) to FIG. 4 (A) to (D)).

In this embodiment, continuous drilling is performed using a multi-axis drilling machine, and the steaming and cement milk are mixed and stirred to construct rows of sol piles 2 as shown in FIGS. 1(A) and 1(B). Inside these sol piles 2, long reinforcing members 3 made of H steel or the like having a length corresponding to the length of the sol piles 2 are suspended and buried. For the sol 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 the sol pile 2, and a length correcting tool to be described later is added to the length correcting tool side. By suspending it from the ground, it is buried as shown in Figure 1 (A). When the lower end of the short reinforcing material 4 reaches the bottom of the sol pile 2, the length corrector is removed from the short reinforcing material 4 and pulled up to form the sol pile row retaining wall 1 as shown in FIGS. 1(A) and 1(B). get.

2 and 3 show examples of the length corrector 5. FIG. The length corrector 5 is mainly composed of an H steel 6 having a short length, and has anti-slip plates 7 on both web surfaces of the H steel 6.
are provided with their bases fixed by welding and their tips protruding downward, and long bolts 8 for temporary fixing are supported on both flange surfaces of the H steel 6 by bearings 9 so as to be freely rotatable and downward. The structure is such that a hanging hole 10 is provided at the upper end of the steel 6. Accordingly, nuts 11 are fixed to the upper part of the flange surface of the short reinforcing material 4 made of H steel in correspondence with the long bolts 8.

For this reason, as shown in FIG.
When the long bolt 8 is turned while the short reinforcing material 4 is positioned and aligned by sandwiching both web surfaces of the short reinforcing material 4 with the anti-slip plates 7 provided on both web surfaces at the lower end, the tip of the long bolt 8 becomes short. The length corrector 5 can be connected to the short reinforcing member 4 by being screwed into the nut 11 of the reinforcing member 4 .

Next, with reference to FIGS. 4(A) to 4(D), a method of immersing the short reinforcing material 4 using the length correcting tool 5 as described above will be explained.

First, as shown in FIG. 2, a short reinforcing member 4 with a nut 11 provided on the upper part is suspended in the sol pile 2 as shown in FIG. It is temporarily fixed to the ruler 12 with a support pin 13.

In this state, as shown in FIG. 4(B), the length corrector 5 is suspended from the top of the short reinforcing material 4 with a wire 14, and the length corrector 5 is stacked as shown in FIG. 7 sandwich both web surfaces of the short reinforcing material 4, and turn the long bolt 8 of the length corrector 5 to connect the long bolt 8 to the short reinforcing material 4.

Thereafter, the support bin 13 is removed, and the short reinforcing material 4 and the length corrector 5 connected thereto are suspended by a crane and buried in the sol pile 2, as shown in FIG. 4(D). At this time, the short reinforcing material 4 and the length corrector 5 are buried while being guided by the guide ruler 12, so that the burial can be performed with high accuracy.

When the lower end of the short reinforcing material 4 reaches the bottom of the formation hole of the sol pile 2 of a predetermined depth as shown in FIG. 4(C), the long bolt 8 of the length corrector 5 is turned in the opposite direction. , remove the long bolt 8 from the nut 11 of the short reinforcing material 4, release the connection of the length correcting tool 5 to the short reinforcing material 4, and remove the length correcting tool 5 as shown in FIG. 4(D). It is lifted up with the wire 14 and removed from the sol pile 2. In this way, the work of burying the short reinforcing material 4 is completed.

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

In the above embodiment, an example was explained in which Hl6 was used as the length corrector 5, but reinforcing bars were used as the length correcting tool 5, the reinforcing bars were temporarily attached to the short reinforcing material 4, and the reinforcing bars were short reinforced. It is also possible to bury it together with the material 4 and leave it as is.

The length corrector 5 can also be connected to the short reinforcing member 4 using a hook or the like.

(Effects of the Invention) As explained above, in the present invention, long reinforcing materials or short reinforcing materials are selectively buried in each sol pile in the sol pile row. 6
In comparison, it is possible to save resources and reduce costs. Further, since the short reinforcing material is immersed with a length corrector added to the top thereof, the positioning accuracy can be made comparable to that of the long reinforcing material.

[Brief explanation of drawings]

1(A) and 1(B) are a vertical cross-sectional view and a plan view showing an example of a sol pile retaining wall constructed by the method of the present invention, and FIG.
The figure is a perspective view showing an example of the connecting part between the short reinforcing material and the length corrector used in this example, FIG. 3 is a front view showing an example of the length corrector used in this example, and FIG. Figures (A) to (D)
is a process diagram showing the legal process of short reinforcing material using the length corrector in this example, Fig. 5 is a distribution diagram of lateral pressure against the sol pile row retaining wall, and Fig. 6 is a bending moment against the sol pile row retaining wall. FIG. DESCRIPTION OF SYMBOLS 1... Sol pile row retaining wall, 2... Sol pile, 3... Long reinforcing material, 4... Short reinforcing material, 5...
Length corrector, 6... Hl, 7... Anti-slip plate, 8... Long bolt for temporary fixing, 9... Bearing, 1o.
...Hanging hole, 11...Nut, 12...Guide ruler, 13...Support bin, 14...Engraving of wire drawing Figure 4 (A) (B) (C) (D) Procedure amendment Type (Method) % Formula % Display of the case 1999 Patent Application No. 103552 Name of the invention Person who amends the horizontal construction method of Nile Pile Mountain Retaining Walls Name related to the case

Claims (1)

[Claims] In a construction method for a sol pile retaining wall in which a reinforcing material is buried in each sol pile of the sol pile row to construct a sol pile retaining wall, the length of each sol pile is set at every few sol piles. A long reinforcing material having a length corresponding to the length of A length corrector is added to the upper end and suspended from the side of the length corrector to submerge it, and when the lower end of the short reinforcing member reaches a predetermined depth, the length corrector is added to the short reinforcing member. A construction method for sol pile retaining walls that is characterized by removing them from the timber and pulling them up.