JPS6253680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for crushing rock, concrete, etc. by inserting it into a hole drilled in rock, concrete, etc.

Conventionally, the most common method for rock crushing is the blasting method, but this method reduces noise,
Vibrations are generated and have a negative impact on the surrounding environment.
Furthermore, dust is generated, which causes deterioration of the underground working environment. Therefore, there is a need for a rock crushing method that generates less noise, vibration, and dust.

Recently, as a method of this kind, a cement-based filler is filled into holes drilled in the rock, and the filler is expanded through a chemical reaction, and the rock is statically crushed by the expansion pressure. However, this construction method has drawbacks such as poor work efficiency due to the long reaction time of the cement filler, and moreover, it is economically expensive.

There is also a method of crushing rocks by inserting a wedge into a hole drilled in the rock, but although it is possible to crush a part of the rock or a small section of rock, it is difficult to crush a large amount of rock, which is similar to the blasting method. Crushing takes too much time and is therefore inappropriate, requiring a long construction period and resulting in high costs. Furthermore, there is a problem that depending on the strength of the rock, it may not be possible to crush it.

Therefore, as described in Japanese Patent Publication No. 45-1516, a rubber tube with a sealed tip is inserted into a hole drilled in a rock, and pressurized fluid is injected into the rubber tube to expand the rubber tube and remove the rock. A device configured to crush the tube has been developed, but with such a structure, the rubber tube bends freely, making it difficult to insert it into the hole, and it is difficult to supply pressurized fluid to the rubber tube. When the rubber tube is expanded, its outer circumferential surface comes into contact with the hole wall, and then the rubber tube stretches in the length direction, and this elongation direction acts as a relief for the pressing force against the hole wall, causing the rock to break. It becomes difficult to apply the large pressure required for this to the hole wall.

The present invention has been made in view of these problems, and includes a method in which a metal rod is inserted into a cylindrical elastic expandable body, and pressurized liquid is supplied into the elastic expandable body through a liquid press-in hole drilled in the metal rod. At the same time, the longitudinal extension of the elastic inflatable body is restrained through a stopper fixed to the metal rod body, and furthermore, an inner cylinder portion having a folded and bent shape is integrally provided at both ends of the elastic inflatable body. , bringing the inner circumferential surface of the inner cylinder portion into close contact with the metal rod;
This invention provides a crushing device for an outer casing, etc., characterized in that the inner cylindrical portion is tightly attached to a metal rod body to form a reliable seal in proportion to the increase in liquid pressure within the elastic expansion body. be.

Embodiments of the present invention will be explained with reference to the drawings: 1
is a metal bar made of steel bar material, with screws 2 and 3 carved into the outer periphery of both ends thereof, and a liquid press-in hole 4 extending from the center of one end surface to the middle of the metal bar 1 in the axial direction. is bored, and the tip of the liquid press-in hole 4 is an opening 5 in the outer circumferential surface of the central portion of the metal rod 1 in the longitudinal direction.

Reference numeral 6 denotes a cylindrical elastic expandable body made of a relatively thick rubber tube, and inner cylindrical parts 7, 7 each having a shape that is folded back and bent toward the inner periphery are integrally connected to openings at both ends thereof.

The metal rod 1 is inserted into the cylindrical elastic expandable body 6 such that both ends of the metal rod 1 protrude from both end openings of the cylindrical elastic expandable body 6. The inner circumferential surfaces of the inner cylindrical portions 7, 7 are brought into close contact with the outer circumferential surface of the metal rod body 1 due to their elastic force.

8 is the inner peripheral surface of the cylindrical elastic expansion body 6 and the metal rod body 1
A hydraulic pressure chamber having an annular cross section is formed between the outer circumferential surfaces of the hydraulic pressure chamber 8 and the liquid pressure injection hole 4 is communicated with the hydraulic pressure chamber 8.

Reference numerals 9 and 9 indicate stoppers made of countersunk washers, which are inserted from both ends of the metal rod body 1 and whose inner inclined surfaces are connected to both end faces of the cylindrical elastic expansion body 6, that is, the continuous wall portion 6a with the inner cylinder portion 7. It is in contact with and received by the outer end surface of. Note that the continuous wall portion 6a is formed to be thicker than the cylindrical elastic expansion body 6 and the inner cylinder portion 7.

10, 10 are screws 2, 3 at both ends of the metal rod 1
The inner surfaces of the nut-shaped stoppers are screwed into the respective plate washers 9, 9, and the longitudinal extension of the cylindrical elastic expandable body 6 is restrained via the stoppers 9, 9. be.

Reference numeral 11 indicates the liquid press-in hole 4 on one end surface of the metal rod 1.
It is a connecting pipe disposed in communication with the screw 2, and is fixed by a cap nut-shaped connecting fitting 12 screwed onto the screw 2.

To explain an example of the use of the device for crushing rocks and the like constructed in this manner, first, a circular hole b having a diameter slightly larger than that of the crushing device is bored in a rock mass a to be crushed using a drill.

Next, after inserting the crushing device into the circular hole b,
When a high-pressure pump (not shown) connected to the connecting pipe 11 via piping (not shown) is driven, liquid such as water is forced into the hydraulic chamber 8 through the liquid injection hole 4.
The cylindrical elastic expandable body 6 is pressurized and expanded.

When the cylindrical elastic expandable body 6 begins to expand, it closes the gap c in the circular hole b and comes into contact with the inner circumferential wall of the circular hole b, attempting to further expand.

At this time, the elastic expandable body 6 also tries to expand in its longitudinal direction, but this expansion is prevented by the stoppers 10, 10.
This is prevented by stoppers 9, 9 which are fixed by , and therefore expands only in the diametrical direction.

Furthermore, when the pressure within the hydraulic chamber 8 increases, hydraulic pressure acts on the outer peripheral surfaces of the inner cylindrical parts 7 and 7 at both ends of the cylindrical elastic body 6, causing the inner cylindrical parts 7 and 7 to move around the metal rod body 1. Firmly adheres to the outer circumferential surface to provide a reliable seal.

After the elastic expandable body 6 comes into pressure contact with the inner circumferential wall of the circular hole b, when the pressure liquid is further pressurized into the hydraulic chamber 8, the expansion pressure of the elastic expandable body 6 acts on the rock mass a, and the pressurizing force is applied to the rock mass. When the strength is exceeded, the rock mass a cracks d
is generated and crushed.

The diameter of the circular hole b drilled in the rock mass a is such that the crushing device of the present invention can be easily inserted, that is, a small gap is created between the circular hole b and the crushing device, and When the rock is crushed, the stoppers 9, 9, which restrain the expansion of the elastic expandable body 6 in the longitudinal direction, expand elastically in the outer radial direction, but only when the outer circumferential surface touches the inner circumferential wall of the circular hole b. It is formed in the diameter.

As described above, the present invention provides a cylindrical elastic expandable body which is formed by integrally connecting inner cylinder portions which are folded back and bent toward the inner periphery in openings at both ends. The cylindrical part is brought into close contact with the outer peripheral surface of the metal rod, and a stopper is fixed to the metal rod in contact with both end surfaces of the cylindrical elastic expandable body, and a liquid press-in hole is drilled in the axial direction from one end of the metal rod. and communicating the liquid press-in hole with a hydraulic pressure chamber formed by the inner circumferential surface of the cylindrical elastic expandable body and the outer circumferential surface of the metal rod, and pressurize the liquid into the hydraulic pressure chamber through the liquid press-fit hole. This invention relates to a device for crushing rocks, etc., characterized in that the cylindrical elastic expandable body is configured to expand in the outer circumferential direction. Not only does it make it easier to insert the inflatable body, but the metal rod has a liquid press hole that communicates only with the hydraulic chamber inside the elastic inflatable body, making it possible to press all the pressure liquid into the hydraulic chamber. ,
A large expansion force can be generated in the elastic expandable body, and since the elastic expandable body is restrained from expanding in the longitudinal direction by stoppers fixed to metal rods on both end faces, the hydraulic pressure chamber inside the elastic expandable body is restrained. The pressurized liquid expands only in the cross-sectional direction of a hole drilled in rock, concrete, etc., and applies a large pressure proportional to the outer area of the hole to the rock layer, making it possible to easily crush the rock. Furthermore, both ends of the elastic expandable body are formed into an inner cylindrical part with a bent shape, and the inner peripheral surface of the inner cylindrical part is brought into close contact with the outer periphery of the metal rod, so that the inner cylindrical part is brought into close contact with the outer periphery of the metal rod. When the pressure fluid is supplied, the fluid pressure acts on the outer circumferential surface of the inner cylindrical portion and forcibly presses the inner cylindrical portion against the metal rod. This increases the pressure force of the inner cylinder against the body, making it possible to achieve a reliable seal. Furthermore, since the crushing device crushes rock by simply inserting the crushing device into a hole and injecting liquid into the hydraulic pressure chamber using a pump, the crushing work can be done quickly and noise and vibrations are generated. This can improve the working environment without any problems.

Furthermore, since this crushing device can be reused, the crushing work can be carried out efficiently and economically.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional side view of the state in which it is inserted into a hole drilled in a rock, and FIGS. 2 and 3 are lines AA and B in FIG. 1. −
4 is a longitudinal sectional view of the elastic expandable body in an inflated state, and FIGS. 5 and 6 are sectional views taken along line C-C and line D-D in FIG. 4. DESCRIPTION OF SYMBOLS 1... Metal rod body, 2, 3... Screw, 4... Liquid injection hole, 6... Cylindrical elastic expansion body, 7, 7... Inner cylinder part, 8... Hydraulic pressure chamber, 9, 9... ...stopper, 1
0, 10...Fixing metal fitting, 11...Connecting pipe, a...
Bedrock, b...circular hole.

Claims (1)

[Claims] 1. A metal rod is inserted into a cylindrical elastic expandable body which is formed by integrally connecting inner cylinder portions that are folded back and bent toward the inner circumference at both end openings, and the inner cylinder portions at both ends are inserted into the metal rod body. A stopper for restraining the longitudinal extension of the cylindrical elastic inflatable body is fixed to the metal rod in close contact with the outer peripheral surface and in contact with both end faces of the cylindrical elastic inflatable body, A liquid press-fitting hole is bored in the axial direction, and the liquid press-fitting hole is communicated only with the hydraulic pressure chamber formed by the inner circumferential surface of the cylindrical elastic expandable body and the outer circumferential surface of the metal rod, and the liquid press-fitting hole 1. An apparatus for crushing rocks, etc., characterized in that the cylindrical elastic expandable body is expanded in the outer circumferential direction by forcing liquid into the hydraulic pressure chamber through the cylindrical elastic expandable body.