JPS5876694A - Breaking of fragile matter such as concrete or rock - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting and destroying solid and brittle objects such as concrete structures and rocks.

BACKGROUND ART In recent years, construction methods have been widely used to destroy solid and brittle objects such as concrete structures and rocks by applying the volume expansion properties of quicklime when hydrated. Compared to the conventional dynamite construction method, this construction method is noiseless, vibrationless, and blast-free, and there is no risk of pollution.It is widely used, especially in urban areas, highways, and airport expansion construction projects. ing.

When destroying concrete, rocks, etc. using the water expansion pressure of the above-mentioned quicklime-based expansion agent, it is necessary to carry out a design that takes into account the size, shape, and size of the object to be destroyed in advance. A large number of perforations are provided, and a slurry made by mixing an expanding agent (quicklime), an alkali or other expanding abrasive, and water is injected and filled. The filled expanding agent slurry causes a hydration reaction in the hole and expands, and the expansion pressure causes destruction of concrete, rocks, etc.

In the above conventional method, (1) drilling work to create a designed filling hole in concrete, rock, etc. is performed using an electric drill or a crawler-drill pit, and the hole diameter is 10 to 15 times the normal hole diameter. The holes are drilled at intervals, and the amount of work involved is extremely large.

(2) The total time required for the series of operations of drilling a hole in the object to be destroyed and filling it with a mixed slurry of an expansion agent and an expansion retardant, and the subsequent destruction, is from 12 to 24 hours. Depending on the structure of the object to be destroyed, the condition of the reinforcing bars, the rock quality, etc., the crack initiation time may be delayed further.

(3) If the object to be destroyed is at a high temperature, the slurry-like expansion agent becomes hydrated and causes abnormal expansion, which is dangerous (the so-called gun phenomenon).

...There were a number of problems.

The present invention solves various problems of the conventional method of drilling a hole in the object to be destroyed and filling it with a mixed slurry of a K11il agent and an expansion retardant. The purpose of this invention is to provide a highly economical method for destroying brittle objects such as concrete and rocks, which can shorten the time required to destroy the body.

The method of the present invention involves creating one or more grooves in an object to be destroyed, such as concrete or rock, taking into consideration the size, shape, size after destruction, etc. of each object to be destroyed, and This method is characterized by press-filling quicklime-based swelling agent powder, hydrating it and expanding it, and destroying the object to be destroyed by the expansion pressure. It is also possible to use mixed slurry filling methods.

The details will be explained below based on examples.

In the method of the present invention, a narrow, shallow groove is created in the object to be destroyed, such as concrete or rock, instead of the conventional drilling of holes filled with an expanding agent. The width of the groove is about 1 to 5 W, and the depth is usually about 10 to 150 mm. This grooving work can be done relatively quickly using a diamond cutter or the like, and a commercially available electric-sized diamond cutter can be used for this.

The number of the grooves may be one or more as necessary, and the intervals, positions, directions, etc. of the grooves may be changed as appropriate depending on the condition of the object to be destroyed.

Further, the depth of the groove can be adjusted by controlling a portion of the diamond cutter, but it is preferable that it be as deep as possible.

As the expanding agent to be filled in the groove, quicklime, ie, quicklime, light burnt dolomite, hard burnt quicklime, dead burnt dolomite, silicates containing free lime, etc. are used in powder form.

In other words, instead of using the conventional wet filling method using slurry,
A major feature is that it is a dry method. Therefore, there is no particular need to add alkalis, water glass, fragments, lignin, sodium gluconate, and other inorganic and organic expansion retardants, which are added to suppress the water expansion rate of conventional quicklime systems. Of course, it is possible to use swelling agents to which these are added in the method of the present invention.

To fill the powder of the expanding agent into the circular groove of the object to be destroyed as described above, place the expanding agent into the groove and firmly fix the expanding agent using a suitable thin iron plate or the like. Various methods are possible for filling the powder, such as using the powder as it is or using the powder packed in an elongated paper bag or the like. The inside of the groove may be moistened with water before filling. After the swelling agent is filled up to the upper surface of the groove, the surface is hydrated by sprinkling water. Hot water can also be used for irrigation if necessary.

The combination of grooves and powder expanding agent according to the method of the present invention can be used in conjunction with conventional slurry injection into the drilled area, and when there are natural cracks in rocks etc.
This can also be used as a substitute for the groove and filled with a powdered expansion agent.

By using the method of the present invention as described above, (
1) Using a diamond cutter etc. on the object to be destroyed, cut 1 to 5
Creating wide grooves is extremely easy compared to conventional drilling work, and when drilling is also used, the number of holes can be reduced, so the working time can be significantly shortened.

(2) The quicklime swelling agent filled in the grooves of the object to be destroyed has a very shallow depth of 10 to 15011111*, and the filling density can be made high, so it does not cause abnormal swelling during the irrigation process. It is safe. (3) There is no need to specially mix an expansion retarder with the expansion agent. (4) The time required for cracks to occur in the object to be destroyed is greatly shortened. ... various effects can be achieved. -' Next, embodiments of the present invention will be described.

1. A destructive test was conducted using a cylindrical concrete test piece with a diameter of 153 mm and a height of 30 mm.

Ordinary Portland cement is used for the concrete mix, and the mix is: Ordinary Portland cement: Sand: Gravel =
l: 2: 4, and the amount of water was set to 4596 of the amount of cement.

This concrete test piece was cured in water for more than 4 weeks, and its compressive strength was rs2ts*1/ad after 4 weeks.

(a) At the center of the cylinder, on the axis of the above test piece,
When 5cm and 200 circular holes were made and filled with a slurry of a commercially available quicklime-based swelling agent (the amount of water was 3° of the swelling agent), it took 15 hours for cracks to occur.

(1)) One groove having a width of 2.5 mm and a maximum depth of 2 degrees was made parallel to the axis on the outer periphery of a test piece similar to the above test using a diamond cutter. Figure 1 shows a cylindrical test piece with grooves cut on its outer periphery. In the figure, 1 indicates the concrete test piece and 2 indicates the groove. Quicklime-based swelling agent powder was press-fitted into the groove, and after filling the entire groove, water was sprinkled on the surface. 110 minutes after watering, a crack appeared on the test piece, and the test piece was separated by tapping it lightly with a hammer. The time until destruction is (a
) is shortened to less than l/'F compared to the conventional method.

2. Approximately 1.5 m x 1.5 vn x 1. A fracture test was conducted using limestone with a size of Qm.

A hole with a hole diameter of 4o and a hole length of 8o is drilled in the above limestone in the δ portion (conventional method), and 3 holes are drilled and connected by cutting a groove of width 5cm and depth 3QI1ml between the holes with a diamond cutter. (combination of the method of the present invention and the conventional method).

FIG. 2(a) shows a large number of perforations by the conventional method, (
b) shows a combination of grooves and a small number of perforations according to the method of the invention. In the figure, 3 is limestone, 2 is a groove, and 4 is a perforation.

The perforated portion was filled with a 3° slurry of a commercially available quicklime-based swelling agent, and swelling agent powder was press-fitted into the groove. Cover this groove with a cloth dampened with water.

As a result, cracks occurred in 19 hours in the case of the conventional method, but cracks occurred in 9 hours in the case of the combination of the method of the present invention and the conventional method, indicating that the method of the present invention is highly effective. .

[Brief explanation of drawings]

FIG. 1 is a diagram showing a state in which grooves are cut in a cylindrical concrete test piece by the method of the present invention; (a) is a perspective view;
(bO is a plan view. Fig. 2 (a) is a plan view showing a state in which a hole is drilled in limestone, and (b) is a plan view showing a state in which a hole and a groove are provided. 1: Concrete test piece, 2: Groove, 32 limestone, 4: Drilling. Agent: Masatoshi Sato

Claims (1)

[Claims] After making one or more grooves in a brittle object such as concrete or rock, and filling the groove with expansion agent powder of quicklime,
A method for destroying brittle objects such as concrete rocks, which is characterized by causing this to expand with water and destroying the object to be cut and destroyed by the expansion pressure.