JPH0752080B2 - Blast reinforcement method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blasting reinforcement method, and more particularly to a blasting method for transmitting gas pressure due to explosion of explosive powder to a fluid to reinforce the periphery of a rock drilling hole.

[Prior art and its technical problems] A method of drilling a hard object, inserting explosives such as explosives into the hole, and destroying it by using gas pressure generated by ignition is a concrete structure, bedrock, etc. It is widely known as a method of destroying hard objects of, but as one form of the blasting method, instead of dismantling the hard objects as described above, a fluid is press-fitted into the excavated rocks by using explosive pressure for reinforcement. There is a blast reinforcement method. Regarding this construction method, conventionally, a bag in which reactive resins are packed is loaded into the inner part of the drilled hole, a filling is put therein, and then explosives are inserted into the entrance side to explode. This method has a problem that the range of reinforcement is narrow because the operation is troublesome and the reactive resin is only inserted into the inner part of the drilled hole to reinforce the inner part.

The present invention was devised to solve the above-mentioned problems, and an object thereof is to efficiently apply an explosive pressure to the entire fluid to reinforce a wide range, and to simplify the construction. It is to provide a practical blast reinforcement method that can be performed at low cost.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is a place where a fluid reactive curing agent can be freely moved in a flexible tubular bag when a fluid is press-fitted into the drilled rock to reinforce the bedrock. A fixed amount is sealed, and an explosive having a diameter smaller than this is pushed from the end side of the reactive curing agent-enclosed cylindrical bag to displace and move the reactive curing agent, thereby covering the explosive with the bag wall containing the reactive curing agent. It is made by encapsulating a tubular encapsulated explosive, loading it into a drilled hole, and causing it to explode.

[Action]

For the work, it is enough to push the explosive into the tubular bag, make a tubular encapsulated explosive with the explosive encapsulated in the bag wall containing the reactive curing agent, and load it into the drilling hole. It is simple, and because the explosive is surrounded from the surroundings by the bag wall containing the reactive curing agent, it is protected from impact and the safety is high.
In terms of processing, the cost is very low because it is only necessary to make a tubular bag with the inlet sealed.

When an explosive is exploded, the explosive pressure is uniformly transmitted to the entire reactive hardener because the outer periphery of the explosive is covered with the reactive hardener-enclosed cylindrical bag, and the reactive hardener is drilled. It can be pressed into the whole securely. For this reason, it is possible to enhance the efficiency of reinforcing the bedrock and the natural ground.

〔Example〕

 Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 4 show stepwise an example of the blasting reinforcement method according to the present invention.

In FIG. 1, reference numeral 1 denotes a flexible tubular bag, which is preferably made of a polymer material such as nylon, vinylon or polyethylene, or a laminate of two or more kinds of these polymer materials. In any case, the tubular bag 1 is made to have a required thickness such that it is difficult to tear in a normal state and is destroyed at the time of explosion. The tubular bag may have expandability.

According to the present invention, first, the tubular bag 1 is filled with water glass as a medium for reinforcing blasting and a fluid reactive curing agent 2 such as a hardening aid, cement milk, or a reactive synthetic resin, and the tubular bag 1 is heat-sealed. The reactive curing agent-enclosed cylindrical bag 3 is obtained in advance by a method of tying or binding with a clip or the like. The filling amount of the reactive curing agent 2 is small. That is, the predetermined amount is set so that the bag is not damaged when the explosive is inserted in the next step and the enclosed reactive curing agent 2 can freely move in the bag.

The reactive curing agent-enclosed cylindrical bag 3 is kept in this state until it is used. Immediately before blasting, as shown in FIG. 2, explosives, for example, explosive 4 with a detonator on dynamite is placed at the end of the reactive hardening agent-enclosed cylindrical bag 3, and the explosive 4 is forcibly enclosed with the reactive hardening agent. Push it into the tube bag 3.

As described above, the tubular bag 1 has flexibility, and since the reactive curing agent 2 is not completely filled in the bag and can move inside the bag, the reactive curing that is pushed away as the explosive 4 is pushed in. The agent 20 moves to the entrance side, and the bag wall 11 in the area swells to enclose the explosive powder 4. As shown in FIG. 2, it is preferable that the pushing position of the explosive 4 is substantially at the center of the reactive curing agent-enclosed cylindrical bag 3. If necessary, the inlet side of the reactive curing agent-enclosed tubular bag 3 is filled with adhesive tape or string so that the powder 4 does not escape unnecessarily.

Then, the tubular encapsulated explosive 5 thus obtained is inserted into the hole 60 pre-drilled in the object 6 as shown in FIG.
The tubular encapsulated explosive 5 is enclosed by closing the entrance of the hole with the filler 7. And make it explode in this state.

In the present invention, as shown in FIGS. 3 and 4, the reactive hardener 2 is covered on the outer periphery of the explosive 4 through the cylindrical bag wall 10, and the reactive hardener 2 and the explosive 4 remain until the explosion. It is safe because it does not come into direct contact, but its pressure is evenly transmitted to the entire reactive curing agent when it explodes, and is even on the entire inner wall of the hole 60 through the reactive curing agent from the destroyed bag 1 The pressure can be applied to the hole, which allows the reactive curing agent to be efficiently pressed into the entire hole.

FIG. 5 shows another embodiment of the present invention. In this embodiment, the explosive charge (parent die) 4a processed by inserting the electric detonator 40 and the explosive charge (additional die) 4b without the detonator into the reactive curing agent-enclosed cylindrical bag 3 are pushed into the first cylindrical shape. While making the encapsulated explosive 5a, another reactive hardener-enclosed cylinder bag 3 is an explosive (additional die) 4b.
To make a second tubular encapsulated explosive 5a. . Then, the first and second cylindrical encapsulants 5a and 5b are inserted into the hole 60 pre-drilled in the object 6, the lead wire 41 is pulled out from the hole 60, and the hole entrance is closed with the insert 7. Then, in this state, electricity is applied through the lead wire 41 to explode.

As a specific example, as the bag body 1, a long bag having a material of polyester, a wall thickness of 0.036 mm, a length of 600 mm, and a thickness of 35 mmφ can be given, which is filled with a reactive curing agent. , The entrance was sealed with an aluminum clip. At the time of blasting, gunpowder with a detonator in No. 2 Enoki dynamite was pushed into the center of the bag in the longitudinal direction.

In this state, a hole of 45 mm in diameter and 2500 mm in length, which was drilled along the circumference of the 40 m ² tunnel cross section as shown by the black circle, was charged with the above-mentioned assembly, and the hole entrance was made of clay-like filler. Just close it and let it explode.

〔The invention's effect〕

According to the present invention described above, when the fluid is press-fitted into the drilled rock to reinforce the rock, the fluid reactive hardening agent 2 can be freely moved in the flexible tubular bag 1 in the bag. The reactive curing agent 2 is filled in a fixed amount and the explosive 4 having a diameter smaller than this is pushed from the end side of the reactive curing agent-enclosed cylindrical bag 3.
The bag wall 11 in which the reactive curing agent 2 is contained by pushing and moving
To make a cylindrical encapsulated explosive 5 in which the explosive 4 is encapsulated, and to load this into the drilled hole to explode it.
Since the surrounding area is completely covered with the reactive curing agent-enclosed cylindrical bag 5, the explosion pressure can be uniformly transmitted to the entire reactive curing agent, and therefore the entire hole is highly efficiently reactively cured. The agent can be pressed in, and the effect of reinforcing the bedrock and the ground can be enhanced. Further, as the processing, it is only necessary to fill and seal the reactive curing agent 2 in the cylindrical bag 1, and the work is easy because the explosion 4 is pushed into the reactive curing agent-sealed cylindrical bag 3 and loaded into the hole. Moreover, since the explosive 4 is wrapped in the reactive curing agent-enclosed cylindrical bag 5, it is possible to obtain excellent effects such as safety.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a tubular bag containing a reactive curing agent according to the present invention, FIG. 2 is a cross-sectional view showing a state of producing a tubular encapsulated explosive, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a sectional view showing another embodiment of the present invention, and FIG. 6 is a sectional view of the present invention and the conventional method. It is explanatory drawing which shows a medicine pattern. 1 ... Cylinder bag, 2 ... Reactive curing agent, 3 ... Reactive curing agent-enclosed cylinder bag, 4 ... Explosive, 5,5a, 5b ... Cylindrical encapsulant

Claims (1)

[Claims] 1. When a fluid is press-fitted into a drilled rock mass to reinforce the rock mass, a flexible tubular bag is filled with a predetermined amount of a fluid reactive curing agent so that it can move freely within the bag, and the reaction is carried out. By pushing an explosive having a smaller diameter than the end of the tubular bag containing the reactive curing agent, the reactive curing agent is pushed away and moved to enclose the explosive in the bag wall containing the reactive curing agent. A blasting reinforcement method characterized by making an explosive charge, loading it into a drilled hole, and exploding it.