JPS59206556A - Rupture construction method - 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 simply and quickly crushing objects to be crushed using a static crushing agent. More specifically, by utilizing the water heat generated by quicklime to promote the water use reaction of the static crushing agent, the expansion pressure can be increased.By controlling the magnitude and rate of heat generation, the expansion pressure can be increased. The present invention relates to a construction method that controls the speed and effectively performs crushing for any short period of time.

Currently, various companies are selling static crushing agents (hereinafter simply referred to as "crushing agents") mainly composed of CaO that utilizes the hydration expansion of CaO. The problem with these crushing agents is that when the hydration reaction of CaO progresses rapidly, the resulting heat generation causes a rapid rise in the slurry temperature, causing an eruption phenomenon (also called a gun phenomenon). The problem is that slurry or wet cake must be filled and crushed at the bottom.

However, the hydration reaction of CaO has a strong temperature dependence, so if you try to suppress all the eruption, you will also suppress the development of hydration expansion, and as a result, the crushing time will be delayed and will take about half a day at most. It can only be crushed in one day. On the other hand, there is a strong need for short-time crushing using crushing agents. To meet this requirement, the temperature of the slurry or cake must be kept high to promote the development of expansion pressure.

The present inventors proposed that the inventors take advantage of the increase in water temperature due to water utilization and fill the crushing agent under conditions that cause eruption, and then continue using ultra-rapid hardening cement or rapid-setting cement with comparable performance. 1 by kumping the paste, mortar or comfleet to a predetermined length depending on the pore diameter.
We succeeded in making crushing possible in a short time of ~5 hours.

However, even with this method, in order to fully control the ejection time and keep the crushing time within a certain range, the temperature of the material to be crushed,
The preparation of the crushing agent must be changed depending on the size of the pores,
There is the hassle of having to prepare several varieties throughout the year. The crushing time also varies from 1 to 5 hours, and although it is short-time crushing, it does not necessarily mean that the crushing time can be controlled freely and accurately. In addition, if crushing is to be achieved within one hour, the hydration reactivity of the crushing agent must be increased dramatically, which significantly impedes workability and safety before filling the holes. It was impossible to achieve.

On the other hand, after filling a hole with a crushing agent, a casing vibrator is inserted, an electric heater is installed in the pipe, and electricity is supplied to destroy concrete structures etc. by the water utilization reaction of the crushing agent. No. 45-29163] is known.This method has the advantage that the crushing time can be controlled by controlling the strength of the wattage of the electric heater.

However, the method of inserting a casing pipe and installing an electric heater inside the pipe is a method in which a relatively small-scale object to be crushed, such as a concrete block or boulder, is cracked and then secondary crushing is performed using a hand hammer, etc. This does not pose a problem for work and may be easy to recover, but the crushing of benches, vertical structures, etc. may impede beam rubbing and dosing operations, and recovery is almost impossible. On the other hand, regarding the crushing effect, the diameter of the casing vibrator for installing the electric heater needs to be a certain size, so it is difficult to fill it with crushing agent.
Since the amount of JfA decreases and the amount of expansion decreases as a result, there are drawbacks such as a decrease in the crushing effect.

The present invention does not have the above-mentioned drawbacks and provides a method for simply crushing objects to be crushed using a crushing agent in a short time.
The gist of this is that when filling the pores of the material to be crushed with a slurry or wet cake of a static crushing agent based on the basic principle of water expansion, the water-permeable It is a short-time destructive construction method characterized by inserting a pipe or cartridge into the hole.

In the present invention, the water-permeable pipe or cartridge is preferably made of paper, full mesh, plastic net, or the like.

In the present invention, by utilizing the heat of hydration of quicklime to promote the hydration reaction of the crushing agent, the expansion pressure can be increased, and by controlling the magnitude and rate of heat generation, the expansion By controlling the pressure development speed, it is possible to effectively perform crushing for any short time.The present invention has the following features.

(1) Since a water-permeable pipe or cartridge is used, water in the crushing agent slurry or wet cake easily reacts with quicklime in the pipe or cartridge, generating heat. Therefore, there is no need to inject water into the pipe or cartridge, and even if water is injected into the pipe or cartridge due to insufficient water volume, it is easy to inject water into the pipe or cartridge due to its easy water permeability.(2) Into the pipe or cartridge Because it contributes to the water expansion of loaded quicklime almost in the same way as a crushing agent,
As in the above-mentioned patent application No. 1, Destruction method for concrete structures, etc. in Japanese Patent Application No. 45-29163, inserting a casing pipe will not cause the pipe to become hollow, resulting in a decrease in the amount of expansion and a decrease in the crushing effect.(3) Pipe Alternatively, the cartridge can be loaded with quicklime powder and/or granules in advance, and the work is easy at the construction site because it is only necessary to insert the pipe and the cartridge into the hole of the object to be crushed.

(41 After crushing, it will not cause problems such as ripping or dosing.

Hereinafter, the construction method of the present invention will be explained with reference to the drawings. As shown in FIG. 1, a hole 2 is formed by drilling a hole in a material 1 to be crushed. Then the second
As shown, a permeable pipe or cartridge 3 preloaded with quicklime powder or/and quicklime granules is inserted into the hole.

Next, as shown in FIG. 3, a static crushing agent slurry or wet cake 4 is filled between the wall of the hole and the pipe or cartridge. Pour water from the mouth of the vibrator as needed.

As time passes after filling, the quicklime inside the pipe or cartridge generates heat due to a hydration reaction, and this heat is transmitted to the crushing agent slurry or wet cake 4, promoting the hydration reaction of the crushing agent and enabling short-term crushing. .

In addition, when there is a possibility that the crushing agent may be ejected, tamping 5 of cement or plaster paste, mortar, concrete, etc. is performed as shown in FIG. In this case, since the tamping material itself is heated, curing is accelerated and the strength of the tamping material with the hole wall is reached in a short period of time to prevent ejection.

If the hole diameter of the pipe or cartridge becomes large, there is a risk that the quicklime itself in the pipe or cartridge may spout out, so shorten the length of the pipe or cartridge 3 by the tamping length and insert it as shown in Figure 5. Fill the crushing agent slurry or wet cake 4 to 400 ml. Pour water from the mouth of the vibrator as needed.

Next, as shown in FIG. 6, kumping 5 of cement or plaster paste, mortar, concrete, etc. is performed.

As time elapses after charging Jg4, the quicklime in the pipe or cartridge generates heat due to hydration reaction, and this heat is transmitted to the crushing agent to promote water utilization reaction of the crushing agent, making crushing possible for a short time.

The crushing time can be adjusted by changing the diameter and length of the quicklime loading pipe or cartridge, adding sucrose or other retardant to quicklime9, adding an accelerator such as calcium chloride to the edge of the cutlime, or This is done by changing the degree of sintering and particle size.

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 A hole with a diameter of 40 mm and a length of 60 tyn was drilled in a cubic concrete IJ specimen (material to be crushed) with a side of 70 crn.
A paper tube with a diameter of 15 mm and a length of 60 α filled with quicklime that passed through a L2 mm sieve was inserted into the center of the hole, and then a crushing agent slurry IJ-” was mixed at a water/crushing agent ratio of 30 g.
The gap in the r-hole was filled up to the mouth. The crushing agent used was Sumitomo Cement (S-Mite S type).

The specimen was placed in a constant temperature room at 5°C the day before, and all crushing experiments were conducted after confirming that the temperature of the specimen had reached 5°C. As a result, cracks appeared 2 hours after filling, and the product was divided after 3 hours.

For comparison, an experiment was conducted using a conventional method of using a crushing agent, and as a result, cracks appeared in 7 hours and split in 20 hours.

Example 2 In performing vertical excavation of granitic bedrock (object to be crushed),
Hole spacing i, diameter 65 mm x depth 1.5 m.

m, 10 holes were drilled at a drilling angle of 60°.

A wire mesh pipe with a diameter of 20 mm and a length of 1.3 m, filled with quicklime to pass through a 2.5 mm sieve, was inserted into the center of each hole, and then a crushing agent slurry was mixed at a water/crushing agent ratio of 30%. was filled into the gap between the holes to the same level as the pipe. Next, ultra-fast hardening cement, cement Nikawa sand ratio 1
: 1, cement: water ratio 1 : 0.5 mortar was applied to the mouth of the hole, and tamped 1,7'C0.The crushing agent used was S-Mite V type manufactured by Sumitomo Cement ■, and the ultra-fast hardening cement was also manufactured by Sumitomo Cement. ■It is made of jet cement.

The season was the bitterly cold winter season of February, and the rock temperature was 5°C at a depth of 1.5 m.

The results showed that cracks occurred 1 hour after filling and reached a maximum crack size of 30 mm and an average size of 20 mm at 2 hours, indicating a good crushing effect. In addition, the ripping results were able to achieve the planned depth of almost 100 inches.

[Brief explanation of drawings]

Figures 1 to 6 are explanatory diagrams of the destructive construction method of the present invention.
・Object to be crushed 2...hole 3...permeable pipe or cartridge loaded with quicklime 4...slurry or wet cake of static crushing agent 5...
Kunbing Figure 3 Fan Figure 6

Claims (1)

[Claims] When filling the slurry or wet cake of a static crushing agent based on the basic principle of hydration expansion into the holes of the material to be crushed, a permeable pipe or cartridge pre-loaded with quicklime powder or/and quicklime granules is inserted into the holes. A short-time destructive construction method characterized by inserting the