JPS5848693B2 - High pressure continuous wall construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure column continuous wall construction method for forming a continuous wall in the ground.

Various construction methods have been proposed in the past in which walls are constructed by injecting grout into the ground for purposes such as water stoppage and earth retention, but with conventional construction methods, the thickness of the shaped wall is uneven. This resulted in problems such as lack of strength and troublesome construction.

In view of the above-mentioned points, the present invention aims to provide a high-pressure support continuous wall construction method that allows a continuous wall of a constant thickness to be easily constructed in the ground.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the high-pressure column continuous wall construction method according to the present invention will be described below with reference to the drawings.

In the high-pressure column continuous wall construction method, as shown in Fig. 1, a polling rod 1 is attached to a drilling machine, a tip resistor 2 is attached to the tip of the polling rod 1, and the polling rod 1 is rotated by the drilling machine. By lowering it, a plurality of pillar insertion holes 3 are excavated in the ground 4 at regular intervals.

Next, as shown in FIGS. 2 and 3, an H-shaped steel 5 as a support is installed in the support insertion hole 3.

Then, as shown in FIG. 4, a multi-spindle drilling machine 6 is installed between the two H-beams 5 where a continuous wall is to be formed, and this allows the continuous wall-shape device 7 to guide the adjacent H-beams 5. It is supported so that it can be raised and lowered freely.

The multi-axis drilling machine 6 has a structure in which a plurality of chucks 11A to 11D are provided on a machine frame 10 that is driven in the vertical direction by a hydraulic cylinder.

Further, as shown in FIGS. 4 and 5, the continuous wall type device 7 has two special resistors 20 arranged in the σζ intermediate connecting plate 21 and the outer connecting plate 21 at a slightly shorter interval than the arrangement interval of the H-shaped steel 5. They are integrated by a connecting plate 22, and have an air blowing pipe 23 provided above the outer connecting plate 22.

The special register 20 has an injection hole 24 facing downward;
Injection holes 25 are formed in the direction along the middle continuous plate 21,
Furthermore, an extension pipe 2 communicating with the inside of the special register 20
6 is installed.

An injection hole 27 is also provided at the tip of the extension pipe 26.

Each special register 20 has a high pressure injection pipe 28 held by the chucks 11A and IID of the multi-spindle drilling machine 6.
are connected to each other.

On the other hand, the nitrogen blowing pipe 23 has a large number of air blowing holes 2.
9 is formed, and an air supply pipe 30 held by a chuck 11B is connected to this air blowing pipe 23.

After installing the continuous wall forming device 7 on the multi-spindle drilling machine 6 as described above, the continuous wall forming device 7 is heated while supplying high pressure water to the high pressure injection pipe 28 and air to the air supply pipe 30.
Using the shaped steel 5 as a guide, it is lowered as shown in FIG.

In this case, the excavation of the ground 4 is carried out by jetting high-pressure water downward and to the sides through the injection holes 24, 25, 27, but the pressure zone is created by the air blown from the air blowing pipe 23 into the upper part of the continuous wall type equipment 7. Since this structure prevents muddy water and the like from accumulating around the continuous wall forming device 7 and weakening the water jetting force, the ground can be excavated effectively.

The muddy water containing earth and sand that has been scraped away by the high-pressure water jet is pushed up by the pressurized air and pumped to the ground surface by a pump, where it is discharged.

The reason why the extension pipe 26 having the injection hole 27 is provided to inject water from an intermediate position is to make it possible to form an excavation space with a sufficient width.

In reality, if the continuous wall forming device 7 is lowered monotonously, sufficient ground cannot be excavated, so the continuous wall forming device 7 is gradually dug down while moving up and down.

As shown in FIG. 7, when the excavation of the ground 4 to the desired depth is completed and the plate-shaped excavated space A is formed between the H-beams 5, cement is poured into the high-pressure injection pipe 28 of the continuous wall forming device 7. The continuous wall forming device 7 is gradually pulled up while supplying a grouting material such as milk and sending lower pressure air to the air supply pipe 30.

As a result, the grout material is injected at high pressure from the injection holes 24, 25, and 27, 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 23, the friction between the continuous wall device 7 and the ground 4 can be reduced, making pulling up easier.

In reality, it takes a considerable amount of force to monotonically pull up the continuous wall device 7, so it is gradually raised while reciprocating up and down.

When the continuous wall type device 7 is raised to the ground surface and the injection of grout is completed, the H-shaped steel 5 as a support is installed as shown in Fig. 8.
A continuous wall B made of a solidified grout material is constructed between the ground 4 sandwiched between the two.

Thereafter, the multi-spindle drilling machine 6 and the continuous wall forming device 7 are moved to the adjacent section, and a continuous wall is formed in the same manner as described above.

As explained above, according to the present invention, since the ground is excavated into a plate shape by jetting high-pressure water together with pressurized air and then grout is injected, a continuous wall of a constant thickness can be easily formed. It is easy to construct even when forming it for a long time.

[Brief explanation of drawings]

Fig. 1 is an embodiment of the high-pressure post continuous wall construction method according to the present invention, and is a sectional view showing the process of forming a post insertion hole into which an H-shaped steel as a post is inserted, and Fig. 2 is a cross-sectional view showing the process of forming a post insertion hole into which an H-shaped steel is inserted into the post insertion hole. 3 is a cross-sectional view of the same, FIG. 4 is a front view showing the continuous wall forming device attached to the multi-spindle drilling machine, and FIG. 5 is the V-■ in FIG. 4. Fig. 6 is a cross-sectional view showing the process of excavating the ground with a continuous wall forming device, Fig. 7 is a cross-sectional view showing the completed state of excavation, and Fig. 8 is a cross-sectional view showing the continuous wall complete state. be. 1...poling rod, 2...tip resistor, 3...post insertion hole, 4...
Ground, 5...H-shaped steel, 6...Multi-spindle drilling machine, 7...Continuous wall type or device, 10...
Machine frame, 11A to 11D...Chuck, 20.
...Special Regisa, 24, 25.27...
・Injection hole, 28... High pressure injection pipe, 29...
... Air blowout hole, 30 ... Air supply pipe, A ... Excavation space, B ... Continuous wall.

Claims (1)

[Claims] 1. Excavate pillar insertion holes in the ground at predetermined intervals, install pillars in each of the pillar insertion holes, support the continuous wall forming device so that it can move up and down using the adjacent pillars as guides, and After supplying high pressure water and air to form a pressure zone in the ground and lowering the continuous wall type device while injecting high pressure water to excavate the ground into a plate shape, grouting is applied to the continuous wall forming device. A high-pressure support continuous wall construction method characterized in that the continuous wall shape or device is pulled up while supplying material and injecting grout.