JPS61229074A - Limit crushing of concrete structure - 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 Recently, hydration expansion materials (product names: S-Mite, Plystar (Nato) is now used. However, according to the construction instructions given by manufacturers such as S-Mite, it takes a long time (about 1 day) for the hydration reaction to generate expansion pressure and cause cracks and fractures in concrete structures. Since the force is weak, secondary crushing is not performed using mechanical force.
It had the disadvantage that it could not be removed. The present invention has been made to solve these drawbacks, and provides a method for crushing concrete structures, etc., which can be constructed quickly and safely, has a strong crushing force, and can be constructed at low cost. The present invention will now be described in detail.

FIG. 1 shows an example of concrete crushing work according to the present invention. A hole 2 of a required length is drilled in a long concrete 1, and the hydration expansion material (S-Mite Nato) is kneaded with water to form a slurry 3, which is filled into the nucleation 2 and blasting capsule 4, which will be described later. ~4'' are placed at the required spacing in the packed slurry.

Figure 2 is a schematic diagram of the blasting capsule. Explosive capsule 4
This consists of putting kerosene or the like as a fuel in a small container 5, and putting the small container 5 and potassium permanganate as an oxidizing agent 7 in a large container 6. In FIG. 1, after filling the nucleation 2 with the slurry 3 and loading the blasting capsules 4 to 4'', a reaction accelerating capsule 12 made of quicklime or quicklime and cement is shown.
The slurry near the reaction accelerating capsule is loaded into the mouth of the nucleation vessel by hydration, and the opening of the hole 20 is closed by the hydration expansion of the reaction accelerating capsule 12, and the slurry near the reaction accelerating capsule is closed by the hydration reaction heat of the reaction accelerating capsule. As a result, the hydration reaction of the slurry proceeds from the mouth side of the hole toward the end of the hole in a chain reaction manner due to the heat of the hydration reaction of the slurry. Expansion pressure begins to act on the concrete 1 from the mouth side of the concrete 1, and it functions as a strong stopper.As the hydration reaction of the slurry progresses and reaches the position of the blasting capsule 4'', the heat of the hydration reaction of the slurry causes The blasting capsule 4m is heated, and the oxidizing agent in the blasting capsule 4'' is thermally decomposed to form an oxygen reservoir, and the fuel is vaporized by the high-temperature oxidizing agent, spontaneously ignites, and combusts explosively. A local fracture occurs in IJ-1-1 as shown in Figure 3, 8.Hereafter, the explosion capsule shown in Figure 1 is 4'-+ 4'-p.
4 and burns to 9.9'→10°ICI-p as shown in Figure 3.
Cracks and fractures occur as shown in ll and 11'. By loading a reaction accelerating capsule at the mouth of the hole, it is possible to promote the hydration reaction of the slurry to develop expansion pressure immediately after filling the slurry, and the opening is closed by the hydration expansion of the reaction accelerating capsule. Therefore, there is no risk of the slurry spewing out, and since the reaction of the slurry starts from the mouth side, it acts as a strong stopper against the explosion and combustion of the blasting capsule.
It's safe. In addition, the crushing force of the blasting capsule can be adjusted by adjusting the amount of fuel and oxidizing agent, so it is less dangerous to handle, and when crushed, only a dull cracking sound of concrete is generated, instead of an explosion sound similar to that of gunpowder. doesn't happen. Furthermore, depending on the arrangement of the blasting capsules, the concrete can be divided into pieces of appropriate size.

[Brief explanation of drawings]

FIG. 1 shows an example of concrete IJ concrete crushing according to the present invention, FIG. 2 is a schematic diagram of a crushing capsule, and FIG. 3 shows a state of crushing concrete with the blasting capsule arranged as shown in FIG. 1.

Claims (1)

[Claims] A hydration expansion material whose main component is quicklime, which suppresses rapid hydration reactions at room temperature, is mixed with water and filled as a slurry into holes of the required length pre-prepared in concrete structures, etc. Explosive capsules consisting of a small container containing oxidizing agent and a large container containing oxidizing agent are placed in the filled slurry at required intervals, and then reaction accelerating capsules consisting of quicklime or quicklime and cement are placed in the filled slurry. The mouth of the hole is filled with water, and the opening of the hole is closed by the hydration expansion of the reaction accelerating capsule, and the slurry near the reaction accelerating capsule is hydrated by the heat of the hydration reaction of the reaction accelerating capsule. The resulting heat of the hydration reaction of the slurry causes the hydration reaction of the slurry to proceed in a chain reaction from the mouth side of the hole toward the end of the hole.
Concrete structures, etc. characterized in that the blasting capsules placed in the filled slurry are sequentially heated by the heat of the hydration reaction of the slurry, and the concrete structures, etc. are sequentially crushed by the gas pressure generated by explosive combustion. Limit fracture method.