JPS5842513Y2 - Continuous wall forming device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a continuous wall forming device for excavating the ground by injecting high-pressure water, and filling the excavation with grout to form a continuous wall.

Conventionally, when constructing a continuous wall for purposes such as water stoppage and earth retention, a tip pit was attached to the tip of a boring rod, which was rotated to excavate a cylindrical hole, and then grout was injected to form a circular hole. Column-shaped solid bodies were placed, and solid bodies were successively placed adjacent to each other.

For this reason, it took time and effort to construct a continuous wall, and it was not possible to form a continuous wall with a constant thickness.

In view of the above points, the present invention aims to provide a continuous wall forming device that can easily construct a continuous wall of a constant thickness in the ground.

Embodiments of the continuous wall forming apparatus according to the present invention will be described below with reference to the drawings.

1 and 2, the continuous wall forming device 1 integrates two special registers 2 with an intermediate connecting plate 3 and an outer connecting plate 4, and further includes an air blowing pipe 5 above the outer connecting plate 4. It has a similar configuration.

As shown in FIGS. 3, 4, and 5, the special resistor 2 includes a cylindrical body 10 welded to the middle connecting plate 3 and the outer connecting plate 4, and an inner side of the upper opening of the cylindrical body 10. It has a female screw member 11 to be screwed, a tip tube 12 to be screwed to the lower end opening of the cylinder 10, and a cover 13 to be screwed to the tip of the tip tube 12.

An extension pipe 14 is screwed onto the side surface of the cylindrical body 10 along the middle connecting plate 3, and an injection hole member 16 having an injection hole 15 formed at the tip of the extension pipe 14 is screwed and fixed. .

Further, an injection hole member 18 having an injection hole 17 formed at a position below the extension pipe 14 is screwed and fixed to the side surface of the cylinder 10, and an injection hole member 21 having an injection hole 20 formed inside the tip tube 12 is screwed to the side surface of the cylinder 10. is fixed with screws.

The cover 13 is for preventing the injection hole 20 from being clogged with earth and sand, and has an excavation tip 22 provided on its tip.

Similarly, drilling tips 22 are also provided at the upper and lower ends of the cylindrical body 10.

On the other hand, a large number of small holes 30 are provided in the air blowing pipes 5 arranged above the outer connecting plate 4, and air is blown out from these small holes 30.

Note that the cylindrical body 10 of the special register 2 has a female screw member 11.
A high-pressure injection pipe 40 that is threadedly engaged with the air supply pipe 5 is attached to the air blowing pipe 5, and an air supply pipe 41 is attached to the air blowing pipe 5.

The above-mentioned continuous wall forming device 1 usually has the following steps as shown in FIG.
It is used by being attached to a multi-spindle drilling machine 50.

This multi-spindle drilling machine 50 has a plurality of chucks 52A to 52D mounted on a machine frame 51 that is driven vertically by a hydraulic cylinder.
The high-pressure injection pipe 40 is connected to the chuck 5.
2A and 52D, chuck the air supply pipe 41 to the chuck 52.
B holds each.

Next, the operation of the continuous wall forming apparatus 1 will be explained.

First, post insertion holes 61 are drilled at regular intervals in the ground 60 where a continuous wall is to be formed, and H-beams 62 as supports are installed in these post insertion holes 61.

Then, while supplying high-pressure water to the high-pressure injection pipe 40 and air to the air supply pipe 41, the continuous wall forming device 1 is lowered by the multi-spindle drilling machine 50 using the H-shaped steel 62 as a guide.

As a result, the continuous wall forming device 1 has injection holes 15, 17.2.
0, high pressure water is injected laterally and downwardly along the middle connecting plate 3 to excavate the ground 60 as shown in FIG.

In this case, since a pressure zone is formed above the continuous wall forming device 1 by the air blown out from the small hole 30 of the air blowing pipe 5, muddy water, etc. stays around the continuous wall forming device 1, and water is ejected. Since it prevents the force from weakening, the ground can be excavated effectively.

In addition, since the extension pipe 14 with the injection hole 15 is provided to inject water from an intermediate position, it is possible to form an excavation space with a sufficient width at once.

As shown in FIG. 8, when the excavation of the ground 60 to a desired depth is completed and a plate-shaped excavated space A is formed between the H-beams 62, grouting material such as cement milk is supplied to the high-pressure injection pipe 40. At the same time, the continuous wall forming device 1 is gradually pulled up while sending lower pressure air to the air supply pipe 41.

As a result, the grout material is injected at high pressure from the injection holes 15, 17, 20, and the excavated space A is filled with the grout material.

In this case, since the air is blown out from the air blowing pipe 5, the friction between the continuous wall forming device 1 and the ground 60 can be reduced, making pulling up easier.

When the continuous wall forming device 1 is lifted to the ground surface and the injection of grout is completed, the H-shaped steel 6 serving as a support is installed as shown in FIG.
A continuous wall B made of solidified grout material is constructed between the ground 60 sandwiched between the walls 2 and 2.

As explained above, according to the above embodiment, the ground can be excavated into a plate shape by jetting high-pressure water downward and sideways in combination with pressurized air, and a continuous wall of a constant thickness can be easily formed by injecting grout material. .

In addition, since an extension pipe is provided and high pressure water is injected from the intermediate position of the intermediate connecting plate, an excavation space with sufficient width can be formed at once, resulting in good work efficiency.

According to the present invention, a continuous wall forming device capable of easily constructing a continuous wall of a constant thickness in the ground is obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the continuous wall forming device according to the present invention, Fig. 2 is a bottom view, and Fig. 3 is a section III-II of Fig. 1.
■Cross-sectional view, Figure 4 is the IV-IV cross-sectional view, Figure 5 is the 4th cross-sectional view.
Figure 6 is a front view showing the state in which the continuous wall forming device is attached to a multi-spindle drilling machine, and Figures 7 to 9 are cross sections for explaining the operation of the continuous wall forming device. It is a diagram. 1... Continuous wall forming device, 2... Special register, 3... Middle connecting plate, 4... Outer connecting plate, 5...・Air blowing pipe, 10...
・Cylinder, 14...Extension pipe, 15, 17゜2
0...Injection hole, 16,18.21...
Injection hole member, 30...Small hole, 40...
High pressure injection pipe, 41...Air supply pipe.

Claims (2)

[Scope of utility model registration request] (1) A plurality of special resistors are connected by a connecting body, a first injection hole facing downward and a second injection hole oriented along the connecting body are provided in the special register, and a second injection hole is provided above the connecting body. A continuous wall forming device characterized in that an air blowing pipe having a large number of small holes is arranged. (2) The continuous wall forming apparatus according to claim 1, wherein the special resistor includes an extension pipe extending along the connecting body and having a third injection hole at its tip.