JPH0259272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rock and boulder crushing device used in an underground continuous wall construction method.

Recently, the underground continuous wall construction method has been increasingly used for constructing underground water-stop walls, earth-retaining walls, or as a part of a structure or the structure itself.

Various types of excavating machines for forming underground continuous walls have been developed, and these machines include those equipped with a plurality of rotating bits at the lower end, or those that use a special clamshell bucket.

However, if there is a hard layer underground such as bedrock or boulders, it becomes difficult for such equipment to excavate below that level.

Conventionally, when an excavator encounters bedrock or boulders, the excavator is first pulled up, then a plumb-type chisel is dropped, and the falling energy is used to crush the rock. In this method, excavation efficiency is significantly reduced.

Furthermore, if a large weighted chisel is dropped, the bentonite liquid will cause large convection, which may cause the side wall to collapse.

In addition, multiple breakers are installed in the lower part of a rectangular cylindrical frame that can be swung from side to side by hydraulic cylinders, and the breakers are suspended in a deep trench using a wire rope, and the breakers are used to destroy rock, etc. There is also.

This conventional device is superior to those that drop a weight-type chisel, but it involves the extremely difficult task of lowering a frame suspended from ropes to near the bottom of a deep trench and directing the chisel to the desired location. There is a problem.

The purpose of this invention is to provide a rock crushing device that can efficiently crush underground bedrock and boulders while maintaining the stability of the wall surface, in order to solve the problems of the conventional underground continuous wall construction method as described above. It is.

That is, in this invention, a trolley is installed on the ground to move along a deep trench excavated by an excavating machine for forming an underground continuous wall, and a hollow support supported by the trolley so as to be able to move up and down is inserted into the deep trench. A pair of left and right stabilizing plates are provided in the middle part, which are moved forward and backward by hydraulic cylinders to contact or separate from both side walls of the deep groove, and a bracket is provided at the lower end of the support column, which is configured so that the direction can be freely changed by the hydraulic cylinder. A hydraulic breaker is installed at the lower end, and the cutting edge of the chisel at the lower end of this hydraulic breaker has a flat shape with a width almost equal to the width of the deep groove, and is shaped like a comb.The hydraulic breaker can be moved in the longitudinal direction of the deep groove to remove rocks, boulders, etc. It is made so that it can be crushed.

An embodiment of the present invention will be described below based on the accompanying drawings.

In the figure, 1 is a deep trench made in the ground 2, and this deep trench 1 was excavated by a known excavating machine (not shown). The rock crushing device of the present invention is used once the rock is pulled up.

This crushing device consists of multiple supports 3 made of steel pipes, etc.
The upper and lower flanges are removably connected by means such as bolts to form a support of a desired length, and a hydraulic breaker 4 is attached to the lower end of the support.

The hydraulic breaker 4 is attached to a bracket 5 attached to the lower end of the column 3, and the direction of the bracket 5 can be changed by a hydraulic cylinder 6. The hydraulic breaker 4 is designed to withstand use underwater, and has a chisel 7 attached to its lower end that can move forward and backward, and the piston inside the breaker 4 is reciprocated by hydraulic pressure and gas pressure in the gas chamber. In the case of the present invention, the cutting edge 8 of the chisel 7 is flat and is a special comb-shaped chisel with multiple branches.

Reference numeral 9 denotes a plurality of stabilizing plates provided on both sides of the column 3 near the bottom, and these stabilizing plates 9 are moved forward and backward by a hydraulic cylinder 10.

By bringing this stabilizing plate 9 into contact with both side surfaces of the deep groove 1, the support column 3 is stabilized.

Further, hydraulic oil and compressed air for advancing and retracting the hydraulic breaker 4 and the stabilizer plate 9 are supplied through hydraulic hoses and air hoses passed through the hollow column 3, and these hoses are connected to the hydraulic hose connected to the upper end of the column 3. The hydraulic breaker 4, the stabilizer plate 9, and the directional bracket 5 are operated by remote control by communicating with a hydraulic unit or an air tank provided on the ground.

11 is a suction pipe attached to the hydraulic breaker 4. The lower end of a hose 12 passed through a hollow support 3 is connected to this pipe 11 via a flexible hose 13, and the upper end of the hose 12 is installed on the ground. The suction pump 14 is connected to the suction port of the suction pump 14.

Rails 15 are laid on both sides of the upper end of the deep groove 1, the wheels of a truck 16 are placed on these rails 15, and the support 3 is loosely fitted into the opening in the center of the truck 16.
is guided by a plurality of guide rollers 17 provided on a truck 16.

To explain the operation of the above embodiment, as shown in FIG.
The cutting edge 8 of the chisel 7 at the lower end is applied to rock or boulders, and the hydraulic breaker 4 is activated to crush the rock or boulders.

At this time, by bringing each stabilizing plate 9 into contact with the side wall of the deep groove 1, the pillars 3 and breakers 4 are stabilized, and a sufficient impact is applied to the bedrock or boulders to crush them.

When the crushing is completed in the above manner, the left and right stabilizers 9 are retracted and separated from both side walls of the deep groove 1, the support 3 is slightly raised to prevent the cutting edge 8 from hitting the bottom of the deep groove 1, and then the cart 16 is moved. Move it to the next crushing point.

Then, the crushing operation is performed again by the above-described operation.

As described above, this invention includes a crushing device installed on a cart installed on the ground so as to move along a deep groove,
Since the crushing device is moved together with the cart, the crushing device is raised and lowered by a crane, and moved by the cart, which has the advantage of being extremely easy to operate and capable of accurate movement.

In addition, in this invention, a pair of left and right stabilizers are provided in the middle of the support column, which are moved forward and backward by hydraulic cylinders to contact or separate from both side walls of the deep groove. It can be moved easily by moving it away from the wall, and when crushing rock or boulders with a chisel, the left and right stabilizing plates are pressed against both walls of the deep groove, allowing reliable crushing in a stable state.

Moreover, even if the column is fixed with a stabilizing plate like this, the direction of the hydraulic breaker can be changed together with the bracket by the hydraulic cylinder, and the cutting edge of the chisel is comb-shaped, so it is easy to move boulders at the bottom of a deep groove. It also makes it easier to crush rocks with sharp edges that partially protrude from the side walls or bottom of deep trenches.

Further, since the cutting edge of the chisel used in the present invention is flat and has a width approximately equal to the width of the deep groove, and is comb-like as described above, only one hydraulic breaker is required.

Therefore, there is no need to interlock the breakers as in the prior art which includes a plurality of breakers, and there is no need to use complicated interlocking machines or hydraulic circuits, resulting in a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal front view of the rock crushing device of the present invention in use, FIG. 2 is a partially longitudinal perspective view of the same, and FIG. 3 is an enlarged side view of the vicinity of the hydraulic breaker. 1... Deep trench, 2... Ground, 3... Support, 4...
Hydraulic breaker, 5...Bracket, 6...Hydraulic cylinder, 7...Chisel, 8...Blade tip, 11...Suction pipe, 15...Rail, 16...Dolly.

Claims (1)

[Claims] 1. A trolley is installed on the ground that moves along a deep trench excavated by an excavating machine for forming an underground continuous wall, and a hollow support supported by the trolley so as to be able to rise and fall is inserted into the deep trench, and in the middle of this support, A pair of left and right stabilizing plates are provided that are moved forward and backward by hydraulic cylinders to contact or separate from both side walls of the deep groove, and a bracket is provided at the lower end of the column so that the direction can be freely changed by the hydraulic cylinder. A device for crushing rock, etc., which is equipped with a hydraulic breaker, and the cutting edge of a chisel at the lower end of the hydraulic breaker is flat and comb-shaped with a width approximately equal to the width of a deep groove.