JPH01207527A - Forming construction of underground wall and device thereof - Google Patents

Abstract

PURPOSE:To simply construct underground walls by running and lowering an underground wall forming device provided with an endless belt fitted with digging chips on the outer face and spraying the high-pressure water through nozzles. CONSTITUTION:The high-pressure water is fed to a liquid feeding pipe 15 and sprayed through liquid nozzles 16A and 16B. At the same time, the operating oil is fed to a hydraulic motor, sprockets 8A, 8B, 8C and 8D are rotated, an underground wall forming device 20 is lowered while a pintle chain 9 is run. The ground is dug by the movement of many chips 12, the sediment at the portion along a support plate 1 is scraped by the high-pressure water, a dug recess with the preset depth is formed. The feeding of the high-pressure water is stopped, the device 20 is gradually lifted while a grout material is fed to the pipe 15, plate-shaped walls are formed in the recess.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an underground wall forming method and apparatus for forming a plate-like wall in the ground for soft ground improvement and the like.

(Conventional techniques and problems) Various construction methods have been proposed in the past in which walls are constructed by injecting grout into the ground for the purpose of water stoppage, retention, etc. The thickness of the wall was uneven, resulting in a lack of strength, and the construction was troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to provide an underground wall forming method and apparatus that eliminates the above-mentioned disadvantages of the prior art and allows a wall of a constant thickness to be easily constructed in the ground.

(Means for Solving the Problems) The construction method of the present invention is an underground wall forming device equipped with an endless belt mechanism in which an endless belt having a large number of drilling chips fixed to the outer surface is stretched between rotating bodies, and a liquid injection port. The underground wall forming apparatus is supported so as to be able to rise and fall freely, and the ground is excavated into a plate shape by injecting high-pressure water from the injection port and lowering the underground wall forming device while running the endless zone.

The device of the present invention has several endless bands (for example, wide bottle chains or caterpillar-shaped ones) each having a large number of drilling chips fixed to their outer surfaces stretched between rotating bodies, arranged on a support plate. 1. The feature is that a hydraulic motor for rotationally driving the rotating body is attached to the support plate.

(Function) In the present invention, earth and sand can be scraped off by running the % zone of the underground wall forming device and moving a large number of drilling chips provided on the outer surface, and furthermore, high-pressure water from the liquid injection port can be removed. By using the jet in combination, it is possible to excavate various types of ground or relatively hard ground, and it is possible to prevent tilting caused by excavation. In addition, by incorporating a hydraulic motor as a drive source to drive the endless belt mechanism, it is possible to mechanically connect the underground wall forming device from the ground (for example, in Rondo, etc.).
It becomes unnecessary to transmit rotational force, and the degree of excavation can be unrestricted. Therefore, number 10 to 100+
Ground excavation is possible to a depth of approximately n.

The muddy water containing the excavated earth and sand is discharged by pumping it to the ground surface using a mudwater pump.

After ground excavation, the underground wall forming apparatus may be pulled up while injecting a grout material such as cement milk into the four excavated plate-shaped parts from the liquid injection port of the underground wall forming apparatus. This lifting operation is performed while the endless band is running and stirring the injected grout material.

These operations are the same as general polling and chemical injection operations, and do not require any skill.

(Example) Hereinafter, an example of the underground wall forming method and apparatus according to the present invention will be described with reference to the drawings.

First, in FIGS. 1 to 5, the underground wall forming device 201
Let me explain in detail. In these figures, two bearing boxes 2A and 2B are fixed to the left half of the support plate 1, and two bearing boxes 2C and 2D are fixed to the right half as well. And bearing box 2
The shaft body 4A is fixed to the person or 2D by the bearing 3, respectively.
4D to 4D are each rotatably supported. Here, the bearing boxes 2A to 2D have a structure that prevents dirt from entering inside, the shafts 4A and 4D at both ends are the follower J-axes, and the shafts 4B and 4C in the middle are the drive shafts. cage, bearing box 2
The rotational force of a hydraulic motor 7 housed and fixed in B and 2C, respectively, is transmitted to sleeve bodies 4B and 4C via reduction gears 5 and 6.

Sprockets (or pulleys) 8A, 8B as rotating bodies are installed at both ends of each shaft body 4A, 4B, iC, 4D.
, 8C, 8D are fixed respectively, and sprocket) 8A,
A wide bottle tier as an endless band between 8B and between 8C and 8D? 9 is strung up.

That is, a total of four endless band terminations, two on the front side and two on the back side of the support plate 1, are provided in which the endless band is stretched between a pair of rotating bodies. A large number of drilling tips 12 are fixed to the outer surface of each wide bottle chain 9. The chips 12 are arranged at different positions in the width direction of the bottle chain 9, for example, in a diagonal arrangement as shown in the plan view of FIG. 2, or in a random arrangement. ) on the tip surface of each tip 12! ? Carbide is integrated to prevent wear. A mounting frame 10 is fixed to the support plate 1, and a plurality of idle rollers 11 are pivotally attached to the frame 10 to prevent each bottle chain 9 from loosening and to increase the length of the bottle chain 9. It is designed to run in a circular orbit.

A liquid supply pipe 15, which also serves as a support pipe for raising and lowering the entire apparatus, is fixed to both ends of the support plate 1, and the tip of the pipe 15 is tilted in two directions, and one end is tilted downward (however, , which is preferably oriented slightly outward), and the other end is a liquid jet port 16B oriented horizontally along the support plate 1. In this embodiment, the injection port 16A is on the right side.

1 (3 [3 is arranged on the front side of the support plate 1, and the left injection port 1 (3A, 1f3B is arranged on the back side).

As a result, when high-pressure water is supplied to the liquid supply pipe 15, the high-pressure water is sprayed from the injection port 16B along the front and back surfaces of the support plate 1, thereby facilitating the descent of the support plate 1 itself. . The lower edge of the support plate 1 is blade-shaped.

A protection pipe 17 is connected to the bearing boxes 2B and 2C in the middle part of the first official post, and hydraulic hoses connected to each hydraulic motor 7 are pulled out from the inside of the pipe 17.

FIG. 5 shows a state in which the underground wall forming device 20 is attached to a multi-spindle drilling machine 30. The multi-spindle drilling machine 30 is slidable vertically with respect to a main body frame 31, and has a plurality of hydraulic chucks 34A, 34B on a machine frame 33 that is raised and lowered by a hydraulic cylinder 32.
, 34C are provided (1 is the construction).Furthermore, support legs 36 for stably supporting the main body frame 31 on the ground are provided on the front, rear, left and right sides of the main body frame 31. (The chuck 30 allows each chunk of rice to be rotated, but the chuck does not need to be rotated in the present invention.

The supply pipe 15, the protection pipe 17, and the liquid supply pipe 15 are each held substantially vertically by the hydraulic chucks 34A, 34B, and 34C (each pipe may be added to the pipes as needed). The hydraulic hose pulled out from the protection pipe 17 is inserted into the flexible pipe 18 and wound around a winding drum 35 which is pivotally supported by the main body frame 31 of the multi-shaft drilling machine 30 so as not to loosen. The end of the hydraulic hose is connected to a power unit as a hydraulic source.

Now, the underground wall forming method is carried out in the following order using the above-mentioned underground wall forming apparatus 20.

As shown in FIG. 5, the underground wall forming device 20 is installed in a multi-axis drilling hole (30) installed on the ground, and high-pressure water is supplied to the liquid supply pipe 15 supported in the vertical direction to form a liquid injection port 16A.
16B injects high-pressure water downward (slightly diagonally outward) and laterally, and supplies oil from the power unit to the hydraulic motor 7 via a hydraulic hose to generate a sub-block) 8A,
8 B and 8 Cs2 D are rotated to forcibly lower the underground wall forming device 20 while running the bottle chain 9. As a result, the ground is excavated by the movement of a large number of chips 12 on the outer surface of the bottle chain, and the soil along the support plate 1 is scraped away by the jet of high-pressure water. Mud water containing excavated earth and sand is pumped to the ground surface by a mud pump and discharged. As a result, as shown in Fig. 6, the width corresponds to the Tit width W of the underground wall forming device (for example, about 5 + n), and the almost constant thickness corresponds to the thickness of the underground wall forming device (for example, about 1.2 + n). A plate-shaped excavation recess 40 is formed, and by continuing the excavation operation, four excavation parts 41 having a sufficient depth D are completed as shown in FIG. Note that during excavation, the running directions of the left and right bintle chains 9 are opposite to each other so that the earth and sand are not biased to one side.

Next, after the excavation recess 41 of the desired depth D is formed, the supply of high-pressure water to the liquid supply pipe 15 is stopped, and this time, while supplying grouting material such as cement milk to the liquid supply vibrator 15, The inner wall forming device 20 is gradually pulled up.

As a result, the injection grout material is
3, the grout material G is injected at a higher pressure, and the fourth excavated portion 41 is filled with the grout material G as shown in Fig. 58 of Pt. At this time, the hydraulic motor 7 of the underground wall forming device 20 is driven, the bottle chain 9 is run, and the grout material G is stirred by the moving tip 12 to carry out the lifting operation. The grout material has a higher specific gravity than muddy water, and is reliably filled from the bottom of the four excavation parts 41.

When the underground wall forming device 20 is raised to the ground surface and the grout injection is completed, a plate-like wall made of a solidified grout material is constructed within the excavation section 41.

FIG. 9 shows an example of the procedure for constructing a continuous wall with a good distance using the construction method of the present invention, in which plate-shaped walls a, 13 I, and C made of a solidified grout material with a width of W are placed at intervals of W. They are sequentially formed in the ground, and then plate-like walls are sequentially formed on the remaining ground portion d+e. In this way, when excavating the remaining ground d+e with width W, the earth and sand on the sides of the plate-shaped walls a, b, and c that have already solidified by jetting high-pressure water can be reliably removed, and the excavation of the ground d and e By later filling with grout material, it is possible to construct a continuous plate-like wall with no gaps.

FIG. 10 shows a construction example of the construction method of the present invention, in which a continuous plate-like wall 51 made of a solidified grout material is constructed along the coastline outside of a retaining wall 50 formed at the outer edge of the road. It is. 52 is a concrete block for wave dissipation. From now on, concrete blocks 52 will be used to prevent coastline erosion.
It is possible to prevent the movement of

(Effects of the Invention) As explained above, the present invention allows walls of a constant thickness to be easily constructed in the ground, and moreover, it is possible to easily construct a wall body of a constant thickness in the ground. Since the soil is excavated using chips, it can be applied to a variety of ground types. Additionally, long continuous walls can be easily constructed without gaps.

[Brief explanation of the drawing]

Fig. fjSi is an embodiment of the present invention and is a front view showing an underground wall forming device, Fig. fIS2 is a partially omitted plan view, Fig. 3 is a partially sectional front view, and Fig. 4. is a partially sectional left side view of the same, FIG. 5 is a front view showing the underground wall forming device mounted on a multi-spindle drilling machine, and FIGS. 6 to 8 are sectional views showing the steps of the construction method. FIG. 9 is an explanatory diagram showing a construction procedure for forming a long continuous wall, and FIG. 10 is an explanatory diagram showing a specific construction example of the present invention. DESCRIPTION OF SYMBOLS 1...Support plate, 4A to 4D...Shaft body, 7...Hydraulic motor, 8A to 8D...Sprocket (or pulley), 9...Bintle chain, 12...Drilling tip , 15...Liquid supply pipe, 16A, 16B.
... Liquid injection port, 17... Protection pipe, 20... Underground wall forming device, 30... Multi-shaft drilling machine, 41... Excavation recess, u, I). C...Plate wall.

Claims (4)

[Claims] (1) An underground wall forming device equipped with an endless band mechanism in which an endless band with a large number of drilling chips fixed to its outer surface is stretched between rotating bodies and a liquid injection port is supported in a vertically movable manner, and a high pressure is applied from the injection port. An underground wall forming method characterized by excavating the ground into a plate shape by lowering the underground wall forming device while injecting water and running the endless zone. (2) The underground wall forming method according to claim 1, wherein after ground excavation, grout material is supplied to the underground wall forming device and the grout is injected from the liquid injection port while the underground wall forming device is pulled up. . (3) An endless band mechanism in which an endless band with a large number of drilling chips fixed to the outside surface is stretched between rotating bodies is attached to a support plate, and a hydraulic motor for rotationally driving the rotating body is attached to the support plate. Characteristic underground wall forming device. (4) The underground wall forming apparatus according to claim 3, wherein liquid injection ports are provided at both ends of the support plate in a downward direction and in a horizontal direction along the support plate.