JPH0376979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of destroying (blasting) a tough and brittle object with explosives in combination with an expansive destructive agent.

Traditionally, solid and brittle objects such as rocks have been destroyed using only explosives. However, with this method, areas other than the planned destruction areas were destroyed and surrounding facilities were damaged. Furthermore, it has been difficult to prevent such damage, and it has also been difficult to reshape the damaged areas in a planned manner. Furthermore, explosives are frequently used and blasting vibrations are not infrequent, which makes the work less safe. Furthermore, even after the destruction, the destroyed surface was damaged, making subsequent work dangerous.

The present invention solves the above problems, makes it possible to reliably create a planned destruction surface, does not damage other parts, and allows the work to be carried out safely. The purpose is to provide a method.

The blasting method using the expandable destructive agent of the present invention is as follows:
Drilling multiple or single holes in a solid brittle object along an arbitrary fracture plan line, filling some or all of the holes with a slurry of an expandable rupture agent, and filling the expandable rupture agent. The method is characterized in that explosives are loaded into the remaining perforations that are not filled or into a part or all of the perforations filled with the expansible destructive agent, and the blasting is performed after the expansion pressure of the expansible destructive agent is applied. The details will be explained below with reference to embodiment figures and the like.

First, the steps of the method of the present invention will be summarized.

1) First, a downward or upward perforation is made in the solid and brittle object to be destroyed. The perforations are drilled along one or more pre-planned lines of failure. The perforation diameter, perforation length, perforation interval, etc. are arbitrarily determined as necessary. The fracture planning line can be any straight line or curve. There may be multiple holes or a single hole.

2) A part or all of the above-mentioned perforations are filled with a slurry of an intumescent rupture agent. The filling position within the borehole is arbitrary. It is optional to fill the entire hole or partially fill it. The placement of the expandable rupture agent filling holes is determined based on the rupture plan. A commercially available dispersing agent can be used.

3) Load explosives. (a) For the remaining holes that are not filled with the intumescent rupture agent, loading may be carried out at the same time as the intumescent rupture agent is filled, or when the expansion pressure of the intumescent agent is applied to the intumescent rupture agent filling hole. It may be done after the action has taken place. (b) In addition, regarding the perforation to be filled with the expansible destructive agent, explosives may be loaded into the same perforation at the same time as filling the expansible destructive agent. Later, the expandable destructive agent may be removed from the borehole and explosives may be loaded into the void. The loading position of explosives in the borehole is arbitrarily determined. It may cover the entire length of the borehole or it may be partially loaded. Commercially available explosives can also be used.

4) Blasting is carried out after the action of the expansion pressure of the expansible rupture agent.

5) Various combinations of the above-mentioned methods can be used for charging the above-mentioned expandable destructive agent and charging explosives.

The method of the invention will now be explained with the aid of some exemplary diagrams.

FIG. 1 shows the construction state of the method of the present invention when the expandable destructive agent filling holes and the explosives loading holes are arranged alternately in a straight line. Figure a is a plan view, b is a cross-sectional view, and , , indicate the steps of the procedure. In the figure, 1 is a brittle object such as concrete or rock to be destroyed, and 2 is a hole drilled in it. 3 shows the state filled with the expansive destructive agent, and 4 shows the state where the remaining perforations not filled with the expansive destructive agent are loaded with explosives. 5 is a planned destruction line. Of course, as described above, the perforation positions can be arranged according to any planned line, and the filling holes for the expansive destructive agent and the charging holes for the explosives can be placed at any number of holes. Blasting is carried out after the expansion pressure of the expandable rupture agent in the borehole No. 3 acts.

FIG. 2 is an explanatory diagram of the case where an expandable destructive agent and explosives are filled or loaded into the same perforation for destruction. A, b, . . . in the figure are the same as in FIG. 1. In the figure, 1 indicates a brittle object, 2 indicates a perforation, 3 indicates a state filled with a slurry of an expandable destructive agent, and 4 indicates a state loaded with explosives. In this case as well, the holes may be arranged according to any planned line, and although the figure shows the explosives being loaded at the top of the hole, it can be placed at any position such as the middle or bottom of the hole. . The same hole is filled with an expandable destructive agent and explosives, but blasting is performed after the expansion pressure of the expandable destructive agent is applied.

Figure 3 is an explanatory diagram of a method of filling an expansible destructive agent into a perforation, generating an expansion pressure, removing the expansible destructing agent from within the perforation, and then loading explosives into the void for blasting. be. Figure a is a plan view, b is a cross-sectional view, and , , indicates the steps of the procedure.

In the figure, first holes 2 are drilled in a brittle object 1, then, in the case of the figure, all the holes are filled with an expansible rupture agent 3, and after the expansion pressure of the expansible rupture agent is applied, the expansible rupture agent is removed from inside the hole. , Load explosives 4 into the empty hole, perform blasting, and set destruction plan line 5.
It is shown that a brittle object is destroyed along the .

It goes without saying that the arrangement of the perforations can be adjusted to any planned line, and that the expansible rupture agent can be removed not in its entirety but in any desired amount.

FIG. 4 is an explanatory diagram of the case where the rows of filling holes for the expansible destructive agent and the rows of explosives loading holes are blasted and destroyed separately. Figures a, b, . . . are similar to the previous example.

In the figure, all of the perforations in row 5 are filled with an expansible destructive agent, and all the perforations in row 5' are filled with explosives. The perforation rows are not necessarily in series. After the expansion pressure is applied to the hole 5, blasting is performed using explosives in the 5' row. Breaking occurs between the 5-5' lines.

As mentioned above, in addition to the above-mentioned examples, various combinations such as the arrangement of the filling holes for the expansible destructive agent, the arrangement of the explosives loading holes, and changes in filling and loading amount are possible.

According to the method of the present invention described above, there is no destruction of parts other than the planned destruction parts, there is no damage to surrounding facilities, and the destruction parts can be reshaped in a planned manner. or,
Compared to conventional blasting methods, the frequency of use of explosives and blasting vibrations are reduced, which increases the safety of the work, and the subsequent work is also safe because there is no damage to the fractured surface even after the blast.

Next, an example of blasting construction using the method of the present invention will be described.

Conventionally, the smooth blasting (SB) method has been used to blast peripheral holes when excavating long-hole shafts using stage blasting to prevent rock damage.
Instead of this SB method, we adopted a blasting method that uses an expansive destructive agent.

Implementation location: Chuo Expressway Enayama tunnel ventilation shaft Size: Diameter 6.2mφ, length 36m Drilling specifications: Hole diameter 115mm, number of holes 24 Hole spacing 800mm Destructive agent used: Commercially available quicklime expansive destructive agent Filling with destructive agent Specifications: Explosives used from the bottom to the mouth: Commercially available explosives The blasting method of the present invention was applied to 24 peripheral holes from the bottom to the top of the shaft.

A total of 12 holes, every other hole among the 24 peripheral holes, are filled with an expandable rupture agent, and after a predetermined period of time (after the expansion pressure of the expandable rupture agent has been applied), the holes other than the holes filled with the expandable rupture agent (a total of 12
The hole was loaded with explosives and exploded. As a result, the blasting work could be carried out safely without damaging the surrounding bedrock or surrounding facilities, and the subsequent work could also be carried out safely.

[Brief explanation of drawings]

Figures 1, 2, 3, and 4 are explanatory diagrams of various forms of the blasting method using the expansible destructive agent of the present invention, and in each figure, a is a plan view, and b is a cross-sectional view. be.
Also, ,,, indicates the step of the procedure. 1: Brittle object, 2: Perforation, 3: Expandable destructive agent,
4: Explosives, 5, 5': Destruction planning line.

Claims (1)

[Claims] 1. A plurality of holes or a single hole are drilled along an arbitrary fracture plan line in a solid brittle object, and one of the holes is
Filling part or all of the perforations with a slurry of an expansible destructive agent, and loading explosives into the remaining perforations not filled with the expansible destructive agent or into part or all of the perforations filled with the expansible destructive agent, A blasting method using an expansible destructor in combination, characterized in that blasting occurs after the expansion pressure of the expansible destructor is applied. 2. The method according to claim 1, wherein the explosives are loaded into the expanding destructive agent filling hole at the same time as the expanding destructive agent slurry is being filled into the same hole. A blasting method that uses an expansive destructive agent. 3. When loading explosives into the expandable destructive agent-filled borehole, after the expansion pressure of the expandable destructive agent filled in the borehole is applied, the expandable destructive agent is removed from inside the borehole, and explosives are filled into the void. A blasting method using an expansible rupture agent according to claim 1, characterized in that the blasting agent is loaded.