JPH0317543B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method of destroying concrete structures, rocks, earth, etc. using an expansive crushing agent. In recent years, the use of explosives and large demolition machinery when dismantling and crushing concrete structures, rocks, earth, etc. during construction work is often regulated from the perspective of environmental protection and safety. A method of dismantling and crushing using an expansive crushing agent is used. This type of expandable crushing agent has CaO (calcium oxide) as its main component and utilizes the hydration expansion of CaO, but when the hydration reaction of CaO progresses rapidly, the slurry is generated due to the heat generated. Eruption phenomenon caused by a sudden rise in temperature (gun phenomenon)
This can be dangerous and the crushing effect will be lost. Therefore, in practice, slurry or wet cake is filled and crushed under conditions in which such a gushing phenomenon does not occur. However, the higher the temperature of CaO, the faster the rate at which CaO develops its expanded state, but at the same time the hydration reaction is promoted and the eruption phenomenon becomes more likely to occur. Therefore, if an attempt is made to suppress such eruption phenomenon, the rate of development of hydration expansion will be suppressed at the same time, and it will take a long time of half a day or a day to crush the object. It had the problem of being stowed away. The present invention was made in view of these conventional problems, and its purpose is to solve the problem of CaO
We provide a destructive method that increases the destructive force by increasing the hydration expansion pressure generated by the hydration reaction of It's about doing. In order to achieve this purpose, in the present invention, the water/disintegrating agent ratio is 10 to 24% (preferably 10 to 20%).
%) (e.g., an expandable crushing agent containing CaO as the main component, CAS)
Expandable crushing agent, C ₁₂ A ₇ + Gypsum + Free-CaO Expansive crushing agent, C ₃ A ₃ CaSO ₄ + CaSO ₄ + Free-CaO
An expansible crushing agent, etc.) is mixed with water and filled into holes made in the object to be crushed, and the expansion of the expandable crushing agent causes cracks in the object to be crushed and destroys the object. It is configured. First, in the present invention, the water/disintegrating agent ratio is 10 to 24.
% because it was found that lowering the water/disintegrating agent ratio increases the expansion pressure. In other words, the amount of water required to destroy objects to be crushed using conventionally used expandable crushing agents containing CaO etc. as the main component is 25-30% when converted to a water/disrupting agent ratio. has been done. This is based on the fact that the theoretical amount of hydration water corresponding to the content of CaO in the expandable crushing agent is between 25 and 30% when converted to a water/disrupting agent ratio. However, preliminary experiments have revealed that when the water/disintegrating agent ratio is lowered as shown in FIG. 1, the expansion pressure of the expandable disintegrating agent increases. In the present invention, the lower limit of the water/disintegrating agent ratio is set to 10% because if the water/disintegrating agent ratio is less than 10%, the mixture of the expandable disintegrating agent and water contains water. This is because the amount of the crushing agent is too small to sufficiently fill the holes formed in the object to be crushed, and as a result, the expansion pressure of the expandable crushing agent decreases. In addition, the reason why the upper limit of the water/disintegrating agent ratio is limited to 24% is that, as mentioned above, when the water/disintegrating agent ratio is 25% or more, the expansion pressure of the expandable disintegrating agent is low, and the material to be crushed is This is because it takes a long time to destroy. In addition, in order to destroy various objects to be crushed, each having a different breaking strength, the upper limit of the water/crushing agent ratio of the expanding crushing agent to be used is approximately 20% from the perspective of ensuring the specified expansion pressure. is preferred. The present invention was carried out as follows based on the above preliminary experiment. That is, when kneading and filling with the conventional standard water/disintegrating agent ratio (water/disintegrating agent ratio 27%)
This is a comparison between the results of an experiment using limestone rock as the material to be crushed, and the case of kneading and filling with a low water/disintegrating agent ratio according to the present invention (water/disintegrating agent ratio of 16%). As a result, as shown in Table 1, when the water/disintegrating agent ratio was set to 16%, cracks occurred in the object to be shredded in about half the time required when the water/disintegrating agent ratio was set to 27%. . Furthermore, Table 2 shows changes over time in the width of cracks that occurred in the crushed material. That is, when the water/disintegrating agent ratio was kneaded and filled at 16%, and cracks were generated, the filling was injected into the packed body on the second day after filling. It was recognized that this would become a rift.

【table】

[Table] In this example, the case where the material is destroyed by filling the pores of the material to be shredded with an expandable shredding agent having a low water/shredding agent ratio was used as an example. The method is not limited to the embodiments, but may be such that water is further injected into the cracks formed in the object to be crushed due to the expansion of the expandable crushing agent to increase the expansion pressure and destroy the object to be crushed. In other words, when water is further injected after the expansion of the expandable crushing agent causes cracks in the object to be crushed, the particles present in the expandable crushing agent filled in the form of slurry into the holes opened in the object to be crushed. do. CaO that has not yet reacted with water starts a hydration reaction due to new water injection, and the expansion pressure increases further. In addition, as a result of investigating the content of unreacted CaO present in the expandable crushing agent mixed with water using X-ray diffraction, as shown in Table 3, there was no unreacted CaO present even after 4 days after kneading. CaO was found to be present at 30%. Furthermore, it was also revealed that this unreacted CaO completely disappeared 7 days after kneading. Therefore, the aim is to cause a hydration reaction by injecting water into the unreacted CaO that still exists even after being kneaded with water in this manner, thereby increasing the expansion pressure.

[Table] After filling the steel pipe with a slurry-like expansible crushing agent mixed at a water/crushing agent ratio of 16%, water was injected into the steel pipe when the expansion pressure had almost stopped increasing. As shown in the figure, it became clear that the inflation pressure increased again. In each of the above-mentioned Examples, an expansible crushing agent containing CaO as a main component was used as an example, but the explanation is not limited to each of the above _- mentioned examples _. +Free−CaO-based expansive crushing agent,
It may be C ₃ A ₃ CaSO ₄ +CaSO ₄ +Free-CaO-based expandable crushing agent, etc., and is not limited to the above embodiments. Since the present invention has the above configuration,
By using an expansive crushing agent and increasing the hydration expansion pressure generated by the hydration reaction of CaO, etc., we can increase the destructive force and crush concrete structures, rocks, earth, etc. in a much shorter time than before. This has the effect of making it possible to destroy the object to be crushed.

[Brief explanation of drawings]

Figure 1 is a graph showing the relationship between the water/disintegrating agent ratio and expansion pressure. Figure 2 is a graph showing the elapsed time (days) and expansion after the expansible crushing agent is kneaded with water and filled into the object to be crushed. This is a graph showing the relationship with pressure, and the broken line in the figure is
This shows the increase in expansion pressure when water is reinjected.

Claims (1)

[Claims] 1. A destruction method characterized by filling holes made in an object to be crushed with an expandable crushing agent blended so that the water/crushing agent ratio is 10 to 24%, thereby destroying the object.