JPH0742696B2 - Pile sheet pile retaining wall - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile sheet pile retaining wall used for ground improvement work and the like.

[0002]

2. Description of the Related Art Pile sheet pile retaining walls of this type have been
For example, the one shown in FIG. 4 is known. It connects the tubular pile members 101 that are erected in the ground to the connecting members 108a.
It is formed by connecting in series through 108b. In this conventional example, the connecting members 108a and 108b are integrally formed so as to project from both ends of the outer diameter of the tubular pile member 101.

To stand the pile member 101 in the ground,
A construction device 10 as shown in FIG. 3 is used. In the figure, reference numeral 11 is an auger for digging a hole in the ground, 12
Is a rotary drive device for the auger 11, 13 is a hammer for driving the pile member 101, 14 is a press-fitting device for the pile member 101, and 15 is a crane vehicle. There are roughly three methods for standing the pile member 101 in the ground. The first method is a method of driving the pile member 101 with the driving hammer 13. In the second method, as shown in FIG. 3, the auger 11 is inserted into a tubular pile member 101 indicated by an imaginary line, and the auger 11 is rotated to dig a hole, while the pile member 101 is formed.
Is a method of press-fitting with the press-fitting device 14. And the 3rd method is a method of press-fitting the pile member 101 with the press-fitting device 14, digging a hole with a bucket (not shown). By arranging the pile members 101 continuously in this manner, a pile sheet pile retaining wall having a chain shape in plan view is formed.

[0004]

In the above-mentioned conventional example, since the connecting members 108a and 108b are integrally formed so as to project from both ends of the tubular pile member 101 on the outer diameter side, the pile member 101 is formed.
Cannot be rotated, and the construction method in which the pile member 101 is erected by any one of the above three methods must be adopted. Therefore, the construction efficiency is poor and the construction period is prolonged.
Also, the hammer 13 for placing, the press-fitting device 14, the bucket, etc. are indispensable, and the construction device 10 becomes large. Therefore, the construction cost is high as a whole.

The present invention has been made in consideration of such circumstances, and it is possible to improve the construction efficiency and shorten the construction period, and to use a normal boring device without using a hammer for driving, a press-fitting device, a bucket, or the like. The technical issues are to enable construction and to reduce construction costs.

[0006]

In order to solve the above-mentioned problems, the means adopted by the present invention is formed by connecting tubular pile members 1 standing upright in the ground through connecting members 8. In the pile sheet pile retaining wall, the pile member 1 is fitted with a substantially circular outer cylinder main body 2 having an excavating blade 4a at the lower end of the pile, and concentrically fitted through the outer cylinder main body 2. Pore water passage 6
And a core tube 5 that forms a pair of engaging recesses 3 formed at both ends of the outer diameter of the outer cylinder main body 2.
The gist of the present invention is that the connecting member 8 is engaged with the member 3.

[0007]

According to the present invention, the pile member 1 is composed of the substantially circular outer cylinder body 2 having the drilling blade 4a at the lower end of the pile, and the core tube 5 forming the water passage 6 for the pile. Can be rotated directly. To erect the pile member 1 in the ground, as shown in FIG. 1 (A), first, the swivel 20 is connected to the upper end of the pile member 1 via the connecting member 16. This swivel 2
The drilling hole water W is supplied from the water supply port 21 of 0 and discharged from the lower end of the pile, and the rotary driving device 12 rotates the pile member 1 itself through the connecting member 16 to dig a hole to pile up to the required depth. The member 1 is sunk and set upright. After the pile members 1 are sequentially erected in this manner, the connecting member 8 is fitted into the fitting recesses 3 formed at the outer diameter ends of each outer cylinder body 2. Thereby, the pile sheet pile retaining wall having a chain shape in plan view is formed.

[0008]

Since the pile sheet pile retaining wall of the present invention is constructed as described above, the pile member 1 can be directly rotated to dig a hole, and the pile member 1 can be sunk to a required depth to stand. The following effects are achieved. The construction efficiency can be improved and the construction period can be shortened. Since a hammer for driving and a press-fitting device are unnecessary, it is possible to carry out the construction with a normal boring device. The construction cost can be reduced as a whole.

[0009]

Embodiments of the present invention will now be described in more detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention,
The figure (A) is a longitudinal cross-sectional view of the pile member, and the figure (B) is a plan view of the pile sheet pile retaining wall which becomes the pile member and the connecting member. This pile sheet pile retaining wall is formed by vertically arranging a plurality of pile members 1 and connecting the pile members 1 continuously via a connecting member 8.

The pile member 1 constituting this pile sheet pile retaining wall includes a substantially circular outer cylinder body 2 having a drilling blade 4a at the lower end of the pile and an outer cylinder body penetrating the outer cylinder body 2 concentrically. 2 and a core tube 5 which is mounted so as to be rotatable relative to each other and forms a borehole water passage 6. The core tube 5 is formed of a steel tube, and a retaining collar 5c is provided at a plurality of locations on the outer periphery of the core tube 5 so as to project therefrom. Further, the outer cylinder body 2 is made of reinforced concrete so as to surround the core tube 5 with the core tube 5 as an axis. The outer cylinder body 2
In order to secure the relative rotation between the outer cylinder body 2 and the core tube 5, it is preferable to apply oil or the like to the core tube 5 as the shaft core in advance. A pair of engagement recesses 3, 3 for engaging the connecting member 8 are formed at both ends of the outer diameter of the outer cylinder body 2.

Further, a plurality of pile members 1 each having a unit length L can be connected so that the pile members 1 can be erected by being sunk to a required depth, for example, as shown in FIG. 1 (A). .
That is, the core pipes 5 are connected to each other by screw-fitting one fitting protrusion 5a to the corresponding fitting recess 5b to connect the drill hole water passage 6, and the outer cylinder bodies 2 are formed on the upper end surface. Engaging projection 2
By engaging a with an engaging recess 2b formed on the opposing surface, the engaging recesses 3 are positioned in a vertical manner.

A swivel 20 is connected to the upper end of the pile member 1 via a connecting member 16. The connecting member 16 is screw-fitted to the core pipe 5, and the pile driving member 12 itself can be rotated by the rotary drive device 12 via the connecting member 16. Incidentally. Reference numeral 20 is a drive motor, 21
Is an endless transmission belt, and 22 is a pulley fixedly attached to the connecting member 16.

Further, as shown in FIG. 1 (A), the outer cylinder main body 2
The lowermost end of the core pipe 5 and the lowermost end of the core pipe 5 forming the borehole water passage 6 are connected to each other via a pipe connecting tool 4 having an excavating blade 4a. That is, the fitting protrusion 5a at the lowermost end of the core tube 5
Is fixed to the threaded hole 4b of the pipe coupling tool 4 by screwing, and the engaging convex portion 4c formed on the upper surface of the pipe coupling tool 4 is fitted into the engaging concave portion 2b formed on the lowermost end surface of the outer cylinder body 2. By being engaged, the rotational driving force of the core tube 5 is transmitted to the outer cylinder body 2.

In order to stand the pile member 1 in the ground,
First, as shown in (A), the connecting member 1 is attached to the upper end of the pile member 1.
The swivel 20 is connected via 6, and the hole water W is supplied from the water supply port 21 of the swivel 20 and discharged from the lower end of the pile. Then, the pile driving member 12 is rotated by the rotation driving device 12 through the connecting member 16 to dig a hole, and the pile member 1 is sunk to a required depth to stand. The excavation mud is pushed up by the excavation water W and discharged onto the ground through the outer peripheral gap between the excavation hole and the pile member 1.

After the pile members 1 are successively erected in this way, the engaging recesses 3 formed at both ends of the outer diameter of each outer cylinder body 2
The connecting member 8 is inserted into 3. Thereby, the pile sheet pile retaining wall having a chain shape in plan view is formed. A steel pipe, a concrete column, or the like can be used as the connecting member 8, but as a simple method, concrete milk is poured into the engaging recesses 3 and 3 facing each other, and the connecting member 8 is formed by hardening it. It may be done.

According to this embodiment, since the pile member 1 can be directly rotated to dig a hole, and the pile member 1 can be sunk to the required depth and erected, the construction efficiency can be increased and the construction period can be shortened. Since an installation hammer, a press-fitting device, a bucket, etc. are not required, it is possible to carry out the construction with a normal boring device, and it is possible to reduce the construction cost as a whole. Especially when the outer cylinder body 2 is made of reinforced concrete,
There is an advantage that an arbitrary shape can be easily manufactured, and the durability of the pile member 1 is improved without the problem of rust, as compared with the case of forming the steel pipe or the like.

FIG. 2 shows another embodiment of the present invention.
(A) is a vertical cross-sectional view of a pile member, (B) is a plan view of a pile sheet pile retaining wall consisting of the pile member and a connecting member, and (C) is a pile sheet pile holder according to another embodiment. It is a top view of a wall. Figure 2
The embodiment shown in (A) and (B) is different from the first embodiment in that the outer cylinder body 2 is not made of concrete but is made of a steel pipe similar to the core pipe 5, and other points are the first. The configuration is similar to that of the above-mentioned embodiment. The core tube 5 is relatively rotatably supported by pivoting metal fittings 2c fixed at a plurality of positions in the outer cylinder body 2, and is prevented from coming off by a coming-off preventing collar portion 5c.

The pile members 1 are also designed so that a plurality of unit lengths can be connected, and the connecting members 8b made of I-shaped steel are inserted into both outer diameter ends of the outer cylinder body 2 as well. A pair of engaging recesses 3 are formed. The core tube 5
The two fitting convex portions 5a are screw-fitted into the corresponding fitting concave portions 5b to be connected to each other.
The engaging convex portion 3a located at 3 corresponds to the engaging concave portion 3a
By engaging with b, the engaging recesses 3, 3 are positioned in a column. Further, the lowermost end of the outer cylinder body 2 and the lowermost end of the core tube 5 forming the drill hole water passage 6 are
They are fixed to each other via a pipe connector 4 having a drilling blade 4a, and are configured to transmit the rotational driving force of the core pipe 5 to the outer cylinder body 2.

The pair of engaging recesses 3, 3 for engaging the connecting member 8 is formed in a shape as shown in FIG. 1C, and the connecting member 8c made of H-shaped steel is engaged. You may enter. Further, it is not necessary to say that the material for forming the outer cylinder body 2 and the core tube 5 can be appropriately modified and implemented.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and FIG.
Is a vertical cross-sectional view of the pile member, and FIG. 6B is a plan view of the pile sheet pile retaining wall that is composed of the pile member and the connecting member.

FIG. 2 shows another embodiment of the present invention. FIG. 2 (A) is a vertical cross-sectional view of a pile member, and FIG. 2 (B) is a pile sheet pile retaining wall that constitutes the pile member and a connecting member. The top view and the same figure (C) are the top views of the pile sheet pile retaining wall which concerns on another Example.

FIG. 3 is a schematic view of a construction device for a pile sheet pile retaining wall.

FIG. 4 is a plan view of a pile sheet pile retaining wall according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tubular pile member, 2 ... Outer cylinder main body, 3 ... Engagement recess of a connecting member, 4 ... Excavation blade, 5 ... Core tube,
6 ... Hole water passage, 8 ... Connection member.

Claims (1)

[Claims] 1. A pile sheet pile retaining wall formed by continuously connecting tubular pile members (1) erected in the ground via a connecting member (8), wherein the pile members (1) are: A substantially circular outer cylinder body (2) having an excavation blade (4a) at the lower end of the pile and a concentric fit that penetrates through the outer cylinder body (2) to form a drill hole water passage (6) Core tube (5)
And a pair of engaging recesses (3) at both outer diameter ends of the outer cylinder body (2).
A pile-pile retaining wall characterized in that (3) is formed and the connecting member (8) is inserted into the engaging recesses (3) and (3).