JP2790931B2 - Crushing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for destroying an object to be crushed, such as rock, rock or concrete molding.

[0002]

2. Description of the Related Art Conventionally, in order to break a rock, a hole is formed in the rock, water is sealed therein, and then the sealed water is frozen. Rocks are crushed by the volume expansion pressure of water when the water freezes and changes to ice (Japanese Patent Laid-Open No. 61-14 / 1986).
393).

[0003]

Since the crushing method has no danger associated with the blasting operation and has substantially no noise or vibration, the crushing method is said to be a very useful method. be able to. Meanwhile, the conventional crushing method is limited to crushing objects having a compressive strength smaller than the compressive strength of ice (10 to 30 kgf / cm ² ). This is because ice self-destructs against a crushing object having a compressive strength higher than the compressive strength of ice, but there are many crushing objects having higher compressive strength than ice. An object of the present invention is to provide a crushing method using an expansion pressure which is applicable to a wide range of crushing objects.

[0004]

The crushing method according to the present invention includes piercing a hole in an object to be crushed, enclosing a mixture of soil particles and water in the hole, and freezing the mixture.

[0005]

According to the present invention, the compressive strength of a mixture of water and soil particles enclosed in a hole drilled in an object to be crushed when frozen is more than one hundred tens of kgf / cm ^2. In addition, it is possible to break an object to be crushed having a compressive strength greater than the compressive strength of ice, which is a frozen product of water, and it is possible to crush more types of objects than the conventional crushing method.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a crushed object 10 such as a rock, a bedrock or a concrete molding is provided with a hole 12 having a substantially circular cross section, for example, vertically. A mixture 14 of fine particles, i.e., soil particles, and water is charged, and the hole 12 is plugged with a plug 16. As a result, the mixture 14 is sealed in the hole 12. The hole 12 may be a groove in addition to the illustrated example. Thereafter, a coolant (not shown) such as liquid nitrogen is injected into the holes 12, and the mixture 14 is frozen. The coolant is supplied from a coolant supply source 18 installed on the ground.
It can be injected via a conduit 20 which extends into the hole 12 via the stopper 16. The soil particles in the mixture 14 are about 0.00
Those having a diameter of 74 mm or less are desirable. In addition, the mixing ratio of the soil particles and the water is preferably several to tens of percent of the weight of the soil particles, preferably when the weight of the soil particles is 100. The soil particles do not cause soil contamination. Instead of the soil particles, fine particles of activated carbon, fine particles of red iron oxide and the like can be used.

As shown in FIG. 2, a part of the conduit 20 in the hole 12 is formed of a metal material having excellent heat conductivity and has a closed lower end. The fins 22 having excellent conductivity can be fixed. Thereby, the cooling effect of the coolant introduced into said part of the conduit 20 is exerted extensively on the surrounding mixture 14 via the walls of the conduit 20 and the fins 22.

As shown in FIG. 3, the mixture 14 may be sealed in a cylindrical bag 24 placed in the hole 12 and frozen. The illustrated bag body 24 has a pair of disks 26 spaced apart from each other and facing each other, a tubular connecting rod 28 connecting the disks, and both ends liquid-tightly fixed to the disks 26, and It comprises a rubber tube 30 surrounding the connecting rod 28 and defining a sealed space in cooperation with both disks 26.

The conduit 20 extends from the end 32 of the connecting rod 28 fitted into a hole provided in the center of one of the disks 26 into the connecting rod. A threaded groove is provided on the inner peripheral surface of the end 32 of the connecting rod 28, and the other disk 26 is provided with a tubular projection (not shown) communicating with the connecting rod 28, having a thread engageable with the threaded groove. If so, a plurality of bags 24 can be connected in series and applied to holes 12 of various lengths.
The open end of the tubular projection when a single bag 24 is used, and the open end of the tubular projection of the most distally located bag 24 when a plurality of bags 24 are connected to each other. Closed.

[0010] The use of the bag body 24 is particularly suitable for the crushing object 10.
Is effective, for example, when the mixture 14 flows down from the hole 12 because the hole 12 is opened downward or laterally instead of upward. According to this example, the coolant is supplied into the connecting rod 28 through the conduit 20, and the cooling effect of the coolant on the mixture 14 is exerted through the tube wall of the connecting rod 28. Therefore, it is desirable that the connecting rod 28 is also formed of a material having good thermal conductivity.

As shown in FIG. 4, the mixture 14 in the hole 12 may be frozen without injecting or mixing the coolant. In the illustrated example, a plurality of holes 12 are formed in parallel with each other, and a tube 34 having an open upper end and having excellent heat conductivity is arranged in each hole 12. The open upper end of each tube 34 is in close contact with the stopper 16. Inside one tube 34,
A conduit 20 leading to a coolant supply 18 (FIG. 1) extends through the plug 16. The interior of both tubes 34 communicates via another conduit 36 which extends through the plugs 16 and the other tube 34 has a further conduit 38 which extends through the plug 16 in the bore 12 in which the tubes are located. Installed.

According to this example, the coolant is supplied into the one pipe 20 via the conduit 20, and the coolant is guided into the other pipe 20 via the other conduit 36, And is discharged via another conduit 38. The coolant is
While circulating through each tube 20, it cools the surrounding mixture 14 and freezes it.

When the mixture 14 is frozen, it exerts a larger inflation pressure on the surroundings, that is, on the crushing object 10 than on the case where only water freezes, due to the presence of the soil particles. Creates cracks and destroys them. The expansion pressure when the sintering mixture 14 freezes is a hundred and several tens kg
f / cm ² . In the freezing of the mixture 14, a frost heaving phenomenon, which cannot be obtained when the water is frozen, occurs, which further promotes the destruction of the crushed object 10. The stopper 16 and the disk 26 each have an expansion 12
To the opening of the

[Brief description of the drawings]

FIG. 1 is a cross-sectional view for explaining a crushing method according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

FIG. 4 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 10 object to be crushed 12 holes 14 mixture

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) E21C 37/00 E04G 23/08

Claims (1)

(57) [Claims] 1. A crushing method wherein a hole is drilled in an object to be crushed, a mixture of soil particles and water is sealed in the hole, and the mixture is frozen.