JPH0369000B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a destruction method for destroying objects to be crushed by the expansion pressure generated by kneading an expanding crushing agent and water. This invention relates to a destructive method that can crush objects in a short period of time.

In general, expandable crushing agents containing calcium oxide (CaO) as a main component are widely used for demolition and crushing of concrete structures, rocks, and earth.

In other words, it uses the hydration expansion pressure generated by the reaction between CaO and water to destroy concrete structures and rocks, but on the other hand, when the hydration reaction of CaO progresses rapidly, heat generation causes the slurry temperature to drop. A sudden rise in the amount of water may cause an eruption phenomenon, which is dangerous and will result in a loss of crushing effectiveness. It is something to do.

However, the higher the temperature of CaO, the faster the hydration reaction is promoted, and the rate of development of expansion pressure becomes faster, but at the same time it becomes more likely to cause eruption. It takes a long time, half a day or a day, to destroy
There was a drawback.

To deal with these drawbacks, we have taken advantage of the temperature rise caused by the heat of hydration to fill an expansive crushing agent under conditions that cause an eruption phenomenon, and then used ultra-rapid hardening cement or a material with comparable performance. A destructive method has been proposed in which the material to be crushed can be crushed in a short time of 1 to 5 hours by tamping fast-setting cement paste, mortar, or concrete.

However, even with this type of destruction method, in order to suppress the eruption phenomenon and shorten the time required for crushing, it is necessary to take into account various conditions such as the temperature of the object to be crushed, the outside temperature, and the diameter of the hole drilled. The components and particle size of the expansible crushing agent must be adjusted accordingly, and there is a problem in that many types of expansible crushing agents whose components etc. have been adjusted in advance must be prepared at all times.

In other words, in the case of the destruction method using an expandable crushing agent, expansion pressure is generated by the hydration reaction of calcium oxide, which is the main component of the expandable crushing agent. Pressure development rate changes significantly. For example, crushing is difficult at low temperatures because sufficient reaction of the expandable crushing agent cannot be obtained, and in order to carry out crushing work within a specified time under any environment, it is necessary to use multiple types of expandable crushing agents with adjusted ingredients. The disadvantage of this method is that it is extremely complicated, as it requires preparing a crushing agent in advance, selecting it appropriately depending on the season, the conditions of the work site, and the temperature environment, and using it for the destruction work.

The present invention was developed in view of these conventional drawbacks, and its purpose is to safely and quickly destroy objects without being affected by the conditions and temperature environment of the destruction work site. The purpose is to provide a destructive construction method that enables crushing.

In order to achieve this purpose, the present invention includes the following:
An expansive crushing agent that crushes concrete structures, rocks, etc. by the hydration expansion pressure generated by reaction with water is mixed with water and filled in a slurry state or wet cake state into holes made in the object to be crushed, In a destruction method in which a material to be crushed is crushed by expansion pressure, a cylinder made of cardboard is inserted into the hole, and an expandable crushing agent slurry or a wet cake is filled in the cylinder,
The expandable crushing agent slurry or wet cake is configured to reduce dissipation of reaction heat to accelerate the reaction of the expandable crushing agent slurry or wet cake to crush the object to be crushed.

The present invention will be explained in detail below. First, in the first invention, a cylinder or a hollow polygon made of a material having heat insulating properties is inserted into a hole drilled in a material to be crushed, and an expandable body is placed inside the cylinder or hollow polygon. The materials to be crushed are crushed by filling a crushing agent slurry to reduce the dissipation of the reaction heat of the expandable crushing agent slurry or wet cake. Vinyl synthetic resin, hardened cement products, metals, non-ferrous metals (thick enough to prevent the deterioration of the destructive power of the expanding crushing agent)
etc., and its form is a cylinder with a circular or polygonal cross section or a hollow polygon. In addition, in the second invention, heating the expandable crushing agent slurry or wet cake filled in such a cylinder or hollow polygon to promote the reaction of the expandable crushing agent slurry or wet cake,
The material to be crushed is crushed, and in this case, the heating method is to add water to at least one of quicklime, calcined dolomite, or aluminate-containing minerals and utilize the heat generated by the hydration reaction. Possible methods include methods that use heat generated by chemical reactions, such as methods that use gas burners, etc.

Next, an embodiment of the first invention will be described. As shown in FIG. 1, a plain concrete specimen 1 with a side of 1 m is placed in a thermostatic chamber with a room temperature of 0°C, and the concrete specimen 1 is cooled in advance until the temperature reaches 0°C. A hole 2 with a diameter of 40 mm and a length of 90 cm was bored in the specimen 1, and a cylinder 3 made of cardboard with an outer diameter of 35 mm and a thickness of 1 mm was inserted into the hole 2, and
S-Mite Slurry 4 with a water/disintegrating agent ratio of 25% (expandable disintegrating agent slurry manufactured by Sumitomo Cement Co., Ltd., S
The cylinder 3 is filled with a mold (application temperature: 5 to 20°C).

As a result, cracks occurred 8 hours after filling, and it was possible to fracture 12 hours after filling.

For comparison, a similar crushing test was conducted on a sample without a cardboard cylinder inserted, but cracks appeared 24 hours after filling the slurry, and it was possible to crush it 30 hours later.

Next, an embodiment of the second invention will be described. As shown in FIG. 2, a plain concrete specimen 1 with a side of 1 m is placed in a thermostatic chamber with a room temperature of 0°C, and the concrete specimen 1 is cooled in advance until the temperature reaches 0°C. Specimen 1 has a diameter of 40 mm and a depth
Drill a hole 2 of 90 cm, and insert a hole with an outer diameter of 35 mm and a thickness inside the hole 2.
A 1.5 mm vinyl chloride cylinder 5 was inserted into the cylinder 5, and S-mite slurry 4 (static crushing agent slurry manufactured by Sumitomo Cement Co., Ltd.) with a water/crushing ratio of 25% was placed inside the cylinder 5, leaving a length of 10 cm above the hole 2. and filled it. As a result, cracks appeared 5 hours after filling was completed.
It was possible to crush it after 12 hours.

Similarly, S-mite slurry 4 with a water/crushing agent ratio of 25% was filled into the cylinder, leaving a 10 cm length above the hole 2, and quicklime 6 was then put into the 10 cm long portion above the hole 2. It is made by pouring 20% water to 6. As a result, cracks appeared after 20 minutes, and it was possible to fracture after 1 hour.

In addition, for comparison, we conducted a crushing experiment using the conventional method without inserting a vinyl chloride cylinder and adding quicklime, but it took 12 hours for cracks to occur and could not be crushed after 15 hours. Ta.

In the embodiment according to the second aspect of the invention, the expandable crushing agent slurry is heated using heat generated by a chemical reaction, but the present invention is not limited thereto. In this example, the case where heating is performed using the heat generated when water is added to quicklime has been taken as an example, but the explanation is not limited to this example. At least one of these may be used, as long as it utilizes heat generated by a chemical reaction. Furthermore, the heat source may be one that utilizes heat from a heating wire, a gas burner, a torch burner, or a bonfire. Further, in the embodiment according to the second invention, a case has been described in which a cylinder made of a material having heat insulating properties is formed into a cylindrical shape, but the form of the cylinder is not limited to the above embodiment.

As described above, the first invention is configured to reduce the dissipation of reaction heat of the expandable crushing agent slurry or wet cake filled into the object to be crushed, and therefore is affected by the temperature environment of the destruction work site. The material to be shredded can be easily and quickly shredded even in low-temperature conditions such as in the middle of winter or in cold regions. It is no longer necessary to prepare in advance a variety of variously adjusted expandable crushing agents and select and use them depending on the season and work site environment, thereby reducing the number of preparation steps for crushing work. Furthermore, in the second aspect of the present invention, the expandable crushing agent slurry or the wet cake is heated from above, and can be crushed in a shorter time. Furthermore, the hydration reaction of the expandable crushing agent slurry filled in the holes opened in the object to be crushed is gradually promoted from the top to the bottom, and the areas where the hydration reaction has occurred harden and become a kind of porous material. Since it is formed as a plug, the steam generated by the subsequent hydration reaction will not be blocked, preventing the blowout phenomenon, and making it possible to perform the crushing operation safely.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment according to the first invention,
FIG. 2 is an explanatory diagram showing an embodiment according to the second invention. 1... Object to be crushed, 3, 5... Cylindrical body, 2... Hole,
4... Expandable crushing agent slurry (wet cake).

Claims (1)

[Claims] 1. An expansive crushing agent that destroys concrete structures, rocks, etc. by the hydration expansion pressure generated by reaction with water is mixed with water and applied to the object to be crushed in a slurry or wet cake state. In a destruction method in which a hole that has been opened is filled and the material to be crushed is crushed by expansion pressure, a cylinder made of cardboard is inserted into the hole and an expandable crushing agent slurry or a wet cake is filled into the cylinder. The heat insulating material is characterized in that it reduces the dissipation of reaction heat of the expandable crushing agent slurry or wet cake, promotes the reaction of the expandable crushing agent slurry or wet cake, and crushes the object to be crushed. The destructive method used. 2 An expansive crushing agent that destroys concrete structures, rocks, etc. due to the hydration expansion pressure generated by reaction with water is mixed with water and filled into holes made in the object to be crushed in a slurry state or wet cake state. In the destruction method in which the object to be crushed is crushed by expansion pressure, a cylinder made of cardboard is inserted into the hole, and an expandable crushing agent slurry or wet cake is heated by a heating agent filled in the opening of the hole. A destructive method using a heat insulating material, characterized in that the material to be crushed is crushed by accelerating the reaction of the expandable crushing agent slurry or the wet cake.