JPH0358436B2 - - Google Patents

Description

Detailed Description of the Invention The present invention utilizes the heat generation and expansion generated when water is added to a static crushing agent based on hydration expansion, and uses an auxiliary tool to crush objects such as rock. This relates to a method of crushing materials in a short period of time.

As shown in FIG. 1, a hole is drilled in an object 1 such as rock, and a static crushing agent is mixed with water and preferably a hydration reaction regulator into the hole 2, and a slurry 3 is prepared.
or when these agents are first put into a hole, water is then flowed into the hole to form a slurry, and the volumetric expansion is used to cause crushing of the object to be crushed, The applicant has already proposed a method for increasing the crushing efficiency by heating the opening side of the hole 2 with a heat source 4 filled with water poured into quicklime, for example, to accelerate the reaction of the static crushing agent and increase the crushing efficiency. 58
−202758).

This method can be expected to be highly effective under the normal usage conditions of static crushing agents (temperature of the crushed object 10 to 20℃, hole diameter 45 to 65 mm), but if the temperature of the crushed object is -5 to 10℃,
When the temperature is as low as ℃, there is a problem that the propagation of heat is delayed or stopped, making it impossible to achieve crushing in a short period of time.

Therefore, as shown in Fig. 2, when drilling a hole in the object 1 and filling the hole 2 with the static crushing agent slurry 3, a cylindrical heat sink made of a material with high thermal conductivity, for example, A transmission device 5 is installed in the hole, and the portion of the device above the slurry surface is externally heated to propagate heat from the hole opening toward the bottom of the hole, thereby increasing the static crushing agent slurry. The applicant has already proposed a method for efficiently crushing at low temperatures for a short time by accelerating the reaction (Japanese Patent Application No. 1983-1999).
No. 15011).

With this improved method, the operating temperature range of the short-time crushing method has been expanded from room temperature to low temperature. However, in short-time crushing at high temperatures or in holes with a diameter of 65 mm or more, the reaction rate of the static crushing agent becomes excessive, which tends to cause a blowout phenomenon.

As a method of improving ejection properties, a method of preventing eruption by improving the composition of a static crushing agent;
There are methods to prevent eruptions using construction methods, but the applicant has filed a patent application (Japanese Patent Application Laid-Open No. 184162/1983) for a method of rapid destruction using mechanical restraint by formwork as a method for preventing eruptions using construction methods. However, although this method can prevent blowouts and enable crushing for a short period of time, it has the disadvantage that it is not possible to predict the completion time of crushing or to set the crushing completion time arbitrarily.

The present invention was invented in order to correct the above-mentioned drawbacks of the method, and it expands the range of applicable temperatures and pore diameters in the method using static crushing agents, and stabilizes the crushing efficiency. The purpose is to achieve this goal, and for this purpose the following construction methods will be adopted.

That is, the present invention utilizes a material for heat transfer and mechanical restraint made of a material with high thermal conductivity when filling holes drilled in objects to be crushed with a static crushing agent slurry based on the basic principle of hydration expansion. Either a device is installed in the hole in advance and the static crushing agent slurry is filled, or the device is installed after filling the slurry, and the part of the device protruding from the filling surface is heated externally. , using an auxiliary tool characterized by propagating heat from the hole opening toward the bottom of the hole to promote the reaction of the static crushing agent slurry and at the same time mechanically restraining the slurry to prevent it from blowing out. This is a short-time crushing method.

According to the present invention, there is no variation in the heating efficiency of the static crushing agent due to differences in the temperature and pore size of the object to be crushed, and it is possible to prevent blowouts and to expect a stable crushing effect.

Next, the present invention will be specifically explained with reference to Examples.

Embodiment First, as shown in FIG. 3, a hole 2 is drilled in a material to be crushed 1 made of rock, and a steel heat transfer and mechanical restraint device 6 having a shape as shown in FIG. 4 is assisted in the hole. Install it as a tool.

Next, static crushing agent slurry 3 is filled into the hole,
A heating source 4 filled with water poured into, for example, granular quicklime is installed on the hole opening side, and the portion of the device 6 protruding from the slurry filling surface is heated externally.

Alternatively, a method may be used in which a mechanical device for heat transfer is inserted into the hole immediately after the static crushing agent slurry is filled into the hole to similarly heat the hole opening.

In this way, the heating on the hole opening side is reliably transmitted to the static crushing agent slurry 3, promoting the reaction of the slurry. Further, since the device 6 mechanically restrains the slurry, it is possible to prevent the slurry from spouting out due to excessive heat generation.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of the crushing method according to the prior art, Figure 3 is an explanatory diagram of the crushing method according to the present invention, and Figure 4 is an example of the heat transfer and mechanical restraint tool used in the present invention. show. 1... Material to be crushed, 2... Hole, 3... Crushing agent slurry, 4... Heat source, 5... Heat transfer device, 6...
...devices for heat transfer and mechanical restraint.

Claims (1)

[Claims] 1. When filling a hole drilled in a material to be crushed with a static crushing agent slurry based on the basic principle of hydration expansion, a heat transfer and mechanical restraint device made of a material with high thermal conductivity is inserted into the hole. Either the device is installed in advance and filled with a static crushing agent slurry, or the device is installed after filling the slurry, and the portion of the device that protrudes from the filling surface is externally heated to open the hole opening. A short-time crushing method using an auxiliary tool, which is characterized by propagating heat from the hole toward the bottom of the hole to promote the reaction of the static crushing agent slurry, and at the same time mechanically restraining the slurry to prevent it from blowing out. .