JPH05118188A - Crushing method - Google Patents

Abstract

PURPOSE:To expand a crushing object by boring a hole in this object, sealing a mixture of soil grains and water into this hole, and freezing this mixture. CONSTITUTION:An almost circular cross sectional hole 12 is bored vertically in a crushing object 10, putting a mixture 14 of soil grains and water into this hole 12, and then this hole 12 is plugged up with a stopper 16. Next, a diameter of each soil grain in the mixture is set down to not more than about 0.0074mm, and when a mixed rate of the soil grain and water is set down to 100 in weight, an amount of water is set to several percents to tens of percents over the soil grain in weight. In succession, a coolant is injected into the hole 12 from a coolant supply source 18 set up on the ground via conduit 20 extending into the hole as via the stopper 16, freezing the mixture 14, and the object 10 is cracked and crushed into pieces. With this constitution, large expansion pressure is exerted on the object 10 owing to the presence of the soil grains, thus this method is applicable to a wide range of the objects 10.

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 mass, rock and concrete molding.

[0002]

2. Description of the Related Art Conventionally, in order to destroy rocks, holes have been drilled in the rocks to enclose water therein, and then the enclosed water is frozen. Rocks are crushed by the volume expansion pressure of water when the water freezes and changes into ice (JP-A-61-14).
393).

[0003]

The crushing method is extremely useful because it has no danger associated with the blasting work and is substantially free from noise and vibration. be able to. By the way, the conventional crushing method is limited to crushing objects having a compressive strength smaller than that of ice (10 to 30 Kgf / cm ² ). This is because ice self-destroys a crushed object having a compressive strength higher than that of ice, but there are many crushed objects having a higher compressive strength than ice. The present invention is to provide a crushing method utilizing expansion pressure, which is applicable to a wide range of crushing objects.

[0004]

A crushing method according to the present invention includes forming 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, since the compressive strength of the mixture of soil particles and water enclosed in the hole formed in the object to be crushed when frozen is 100 tens Kgf / cm ^2. It is possible to break an object to be crushed having a compressive strength higher than that of ice, which is a frozen product of water, and more kinds of objects can be crushed than the conventional crushing method.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a crushing object 10 such as rock, bedrock or concrete molding is drilled vertically with a hole 12 having a substantially circular cross section, and the hole 12 is made of soil such as silt or clay. A mixture 14 of fine particles, that is, soil particles and water is put in, and the hole 12 is capped. Thereby, the mixture 14 is enclosed in the hole 12. The hole 12 may be a groove in addition to the illustrated example. Then, a coolant (not shown) such as liquid nitrogen is injected into the hole 12 to freeze the mixture 14. The coolant is supplied from a coolant supply source 18 installed on the ground.
It can be injected via a conduit 20 which extends through the plug 16 into the hole 12. The soil particles in the mixture 14 are about 0.00
Those having a diameter of 74 mm or less are desirable. Further, the mixing ratio of the soil particles and the water is preferably several% to several tens% of the weight of the soil particles when the weight of the soil particles is 100. The soil particles do not cause soil pollution. Fine particles of activated carbon, fine particles of red iron oxide, etc. may be used instead of the soil particles.

As shown in FIG. 2, a part of the conduit 20 in the hole 12 is made of a metal material having excellent thermal conductivity and has a closed lower end, and a heat is provided around the part of the conduit 20. The fin 22 having excellent conductivity can be fixed. In this way, the cooling effect of the coolant introduced in the part of the conduit 20 is exerted extensively on the surrounding mixture 14 via the walls of the conduit 20 and the fins 22.

Alternatively, as shown in FIG. 3, the mixture 14 may be enclosed in a cylindrical bag 24 inserted in the hole 12 and frozen. The illustrated bag body 24 has a pair of discs 26 that are spaced apart from each other and face each other, a tubular connecting rod 28 that connects the discs, and both end portions that are liquid-tightly fixed to the discs 26. It is composed of a rubber tube 30 which surrounds the periphery of the connecting rod 28 and cooperates with both discs 26 to define a sealed space.

The conduit 20 extends inside the connecting rod 28 from the end 32 of the connecting rod 28 fitted in a hole provided in the central portion of the disc 26. A threaded groove is provided on the inner peripheral surface of the end portion 32 of the connecting rod 28, and a tubular projection (not shown) communicating with the connecting rod 28 is provided on the other disk 26 having a screw thread engageable with the threaded groove. If this is done, a plurality of bags 24 can be connected in series and applied to the 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 bag 24 located at the extreme end when a plurality of bags 24 are connected to each other are Is blocked.

The use of the bag body 24 is particularly effective for the crushable object 10.
Is water-leakage, for example, it is effective 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 to the inside of the connecting rod 28 through the conduit 20, and the cooling action of the coolant on the mixture 14 is exerted through the pipe wall of the connecting rod 28. Therefore, it is desirable that the connecting rod 28 is also made of a material having good thermal conductivity.

Alternatively, as shown in FIG. 4, the mixture 14 in the hole 12 may be frozen without pouring or mixing the coolant therein. 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 excellent thermal conductivity is arranged in each hole 12. The open upper end of each tube 34 is in close contact with the plug 16. Inside one tube 34,
A conduit 20 leading to the coolant supply 18 (FIG. 1) extends through the plug 16. The insides of both pipes 34 communicate with each other through another conduit 36 extending through both stoppers 16, and the other pipe 34 has a further conduit 38 extending through the stopper 16 of the hole 12 in which the pipes are arranged. It is installed.

According to this example, the coolant is fed into the one pipe 20 via a conduit 20, the coolant is led into the other pipe 20 via another conduit 36, and finally Is discharged via another conduit 38. The coolant is
While circulating through each tube 20, it exerts a cooling effect on the surrounding mixture 14 causing it to freeze.

When the mixture 14 is frozen, due to the presence of the soil particles, the mixture 14 exerts a large expansion pressure on the surroundings, that is, the crushing target 10 as compared with the case where only water freezes, and the mixture 14 crushes on the crushing target 10. Create a crack and destroy it. The expansion pressure when the binding mixture 14 freezes is several hundred Kg.
f / cm ² . In addition, in freezing the mixture 14, a freezing phenomenon, which cannot be obtained when freezing water, occurs, which further promotes the destruction of the crushed object 10. The stopper 16 and the disk 26 are respectively provided with holes 12 for expansion when the mixture 14 is frozen.
Prevent going to the opening.

[Brief description of drawings]

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

FIG. 2 is a cross-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 Crushing target 12 Hole 14 Mixture

Claims (1)

[Claims] 1. A crushing method in which a hole is cut in an object to be crushed, a mixture of soil particles and water is enclosed in the hole, and the mixture is frozen.