JPH0781266B2 - Underground continuous wall drilling equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an underground continuous wall excavation device.

[Problems to be solved by this invention] Construct a continuous underground wall or strike a sheet pile to prevent groundwater from springing during construction of underground structures or to stop groundwater in dam construction. A construction method such as installing and injecting into the joint is adopted.

When these conventional construction methods are constructed only for stopping water, there are the following problems.

(A) It is usual to construct a continuous underground wall with a wall thickness that is greater than necessary, which makes the construction unnecessarily large and requires a large amount of extra concrete, resulting in high construction costs.

The construction method in which the seat pile is placed and the joint is injected is also large-scale construction and the material cost is high.

(C) It is conceivable to make the wall pressure thin in order to reduce the construction cost on the underground continuous wall, but there is no machine that can excavate a narrow groove, and even if a narrow groove is dug The fluidity is impaired and a homogeneous underground wall cannot be completed.

Also, from the point of view of reliability and reliability of waterproofing, the cracks on the concrete wall at the time of an earthquake impair the waterproofness, and in the construction method using precast concrete panels or sheet piles, impurities, bentonite, etc. are found at the joints. It was not possible to obtain sufficient waterproofness by sandwiching.

Therefore, excavating a narrow groove in the ground, arranging a waterproof sheet in the groove so as to partition this groove into the left and right sides, and hardening material is injected into the groove to solidify the muddy water or soil mortar. A continuous underground impermeable wall construction method has been adopted in which the impermeable wall is filled with water to construct an impermeable wall. It is an object of the present invention to provide an excavation device having excellent working efficiency for excavating a narrow groove used in such a construction method.

[Means for solving problems]

The underground continuous wall excavating device according to the present invention has a substantially rectangular tubular guide post that is erected in a hole formed in the ground and has a rack over the entire length of the front face, and the entire length of the side face of the guide post. From a drive unit that can be moved up and down along a guide post by a guide roller that is locked to a guide rail that is provided, and a saw that has an endless chain with one end pivotally supported by the drive unit and a bit that rotates around the outer periphery is attached. It is characterized in that each of the motors for rotating a sprocket that meshes with a rack, rotating a saw pivotally supported by the drive, and rotating an endless chain is accommodated in the drive unit.

〔Example〕

 The present invention will be described below based on an embodiment shown in the drawings.

In order to use the excavation device of the present invention, a plurality of drill holes 1 are formed in advance in the ground by appropriately separating them. The diameter of the drilled hole 1 does not have to be constant, and it is also possible to increase the diameter of only the drilled hole 1 in which the guide post 4 of the excavating device A which will be described later is erected.
The excavation of the hole 1 is performed while filling muddy water.

Moreover, when excavating rocks or other soils with good self-sustaining property, it is possible to excavate without water without using muddy water.

The excavating device A is composed of a guide post 4, a drive unit 5, and a saw unit 6.

The guide post 4 is a substantially rectangular tube-shaped member having a hollow portion 7 in the center, and a rack 8 is formed on the entire length of one side surface.
A mud hose 9 is passed through the hollow portion 7 so that mud water can be sucked in from a sediment inlet 10 formed at the lower end of the guide post 4.

The drive unit 5 is movable up and down along the guide post 4. A plurality of guide rollers 11 projecting on the outer periphery of the drive unit 5 are engaged with the guide post 4 so that the drive unit 5 can travel along the guide post 4. The drive unit 5 is a power unit
The power unit 12 includes a hydraulic tank 15 and an electric-hydraulic power unit 16 therein. A traveling sprocket 17 and a control box 18 are housed in the control unit 13. The traveling sprocket 17 is a rack 8 of the guide post 4.
The drive motor 19 rotates the traveling sprocket 17 by the electric-power unit 12, and the drive unit 5 travels vertically. A saw turning drive motor 20 is housed in the control unit 13, and the electric-power unit 12 turns the saw turning drive sprocket 21 attached to the saw attachment arm 14. A saw turning sprocket 22 is attached to the tip of the saw attachment arm 14, and an endless saw turning chain 23 is hung between the saw turning drive sprocket 21 and the saw turning sprocket 21.

The saw portion 6 is composed of a saw frame 24, a chain 25 and a bit 26, and one end of the saw frame 24 has a saw mounting arm.
It is pivotally supported by 14, and can rotate together with the saw turning sprocket 22 of the saw mounting arm 14. An endless chain 25 is rotatably attached to the outer periphery of the saw frame 24. The chain 25 has a narrow width, and a large number of bits 26 are fixed to the outer peripheral surface of the saw portion 6 of the chain 25. The chain 25 can be rotated by a chain drive motor 27.

The narrow groove B is excavated by the excavation device A as described above.
First, the guide post 4 of the excavator A is erected in the drilling hole 1,
The saw section 6 is turned so as to be substantially horizontal with respect to the guide post. The drive sprocket 17 is rotated by the drive motor 19 of the drive unit 5, and the drive unit 5 is lowered along the rack 8 of the guide post 4 with which the drive sprocket 17 meshes. The chain 25 is rotated by the chain drive motor 27, and the groove B is excavated between the adjacent drilled holes 1 by the chain 25 of the saw portion 6. Since the saw portion 6 has a narrow width, the narrow groove B can be easily excavated.

During excavation, the trench B is filled with muddy water, and the excavated earth and sand is sucked together with the muddy water from the sediment suction port 10 at the lower end of the guide post 4, and is discharged to the outside of the trench B through the mud hose 9.

When it is difficult to excavate, the saw swing drive motor 20 is rotated, and the saw portion 6 is swung through the saw swing drive sprocket 21, the saw swing chain 23, and the saw swing sprocket 22 to displace the angle and excavate.

After excavating to the same depth as the drilled hole 1, the saw portion 6 of the excavator A
Or the guide post 4 is erected in the next hole 1 and the excavation is restarted.

In addition, when a water blocking sheet is arranged in the groove B excavated for a predetermined length in this way, and a hardening material is injected to fix the muddy water, a narrow underground continuous wall sandwiching the water blocking sheet is formed. Can be built.

〔The invention's effect〕

The underground continuous wall excavating device according to the present invention can obtain the following effects.

Since the rack and the traveling sprocket are engaged and rotated by the rotation of the drive motor, the saw portion can be lifted and lowered sufficiently to withstand the excavation resistance of the saw, and the excavation feed can be reliably performed.

The saw swing drive motor is used to rotate the saw and the chain drive motor is used to drive the chain. Therefore, designing can be simplified by using separate motors for swing and drive. By putting it inside, the excavator was made to be sturdy, and in cooperation with the guide post, it became possible to cope with large excavation resistance.

C. By tilting the saw as necessary, it became possible to excavate according to the geology.

[Brief description of drawings]

FIG. 1 is a perspective view of a construction state of the present invention, FIG. 2 is a perspective view of an excavator, and FIG. 3 is a schematic view of its mechanism. A ... excavator, B ... groove 1 ... drilling hole, 4 ... guide post, 5 ... drive unit, 6 ...
… Saw club.

Claims (1)

[Claims] 1. A substantially rectangular tube-shaped guide post standing upright in a hole formed in the ground and provided with a rack over the entire length of the front face, and a guide rail provided over the entire length of the side face of the guide post. A drive unit that can be moved up and down along a guide post by a guide roller, and a saw provided with an endless chain having one end pivotally supported by the drive unit and attached with a bit that turns around the outer periphery. An underground continuous wall excavating device, which houses respective motors for rotating a sprocket that meshes with, rotating a saw pivotally supported by a drive unit, and rotating an endless chain.