JPH11270151A - Concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a drilling work at a demolition work and eliminate generation of noise, vibration, and coarse particulates, by burrying a pipe divided into a plurality of pieces on the diametral section in the concrete member of a temporary structure so as to expose one end on the surface. SOLUTION: A steel pipe 1 buried in a concrete member 10 is formed into a hollow pipe of which the diametral section is divided into three pieces or four pieces, and it is temporarily fixed by a tape or the like. The form of the steel pipe 1 is made into a cylinder, a square, a hexagon, or the like, and the material is thermoplastic material, a thin piece of metal, or the like. The steel pipe 1 is arranged together with reinforcement so as to expose the one end on the surface, and the number of pipes is set to be the number matching to a demolition work. The piston of a hydraulic lock jack or the wedge is inserted in a drilled hole formed by the steel pipe 1, and the steel pipe 1 is burstedly opened to crush the concrete member. When a static crushing agent is used, the static crushing agent having moisture absorbing expansion characteristic is charged, and the concrete member is crushed by the expansion pressure. Hereby, demolition considering peripheral environment can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete structure, and more particularly to a concrete structure in which a steel pipe for crushing concrete is buried in advance to facilitate dismantling work.

[0002]

2. Description of the Related Art Temporary structures such as the Expo, the Olympics, and various event facilities are dismantled in several months or years, so it is desirable to reduce the work required for dismantling and to save costs such as labor costs. . Also, when the temporary structure to be demolished is adjacent to an urban area, noise and vibrations associated with the demolishing become a problem. Therefore, a dismantling method considering the surrounding environment is desired.

[0003] Among the dismantling methods, there are lock-jack type destruction methods, methods using a static crushing agent, and the like that have almost no noise and vibration. The lock jack type destruction method inserts the piston or wedge of a hydraulic lock jack into a drilled hole in a concrete structure,
This method crushes concrete by pushing a piston or wedge with hydraulic pressure. In the method using a static crushing agent, crushing is performed by using an expansion pressure caused by hydration expansion of a substance having a hygroscopic expansion characteristic.

[0004] Since these construction methods do not involve large noise and vibration, they can be used in an area adjacent to an urban area.

[0005]

However, both the rock jack type destruction method and the method using a static crushing agent require drilling first, and a leg hammer is used in this drilling operation. In this case, noise and dust will be generated. In the rock-jack type destruction method, since the amount of destruction at one time is small, a considerable number of holes are required to crush the crushed mass of concrete to a size suitable for carrying out by a dump truck or the like. Similarly, even in the case of using a static crushing agent, it is necessary to drill a considerable portion and fill the hole with a static crushing agent in order to crush concrete structures. Therefore, in the rock jack type destruction method and the method using a static crushing agent, problems such as noise and dust generation occur in advance drilling work.

[0006] In view of the above problems, an object of the present invention is to provide a concrete structure that does not require drilling work.

[0007]

That is, the present invention is a concrete structure in which a pipe having a plurality of diameter sections is embedded so that one end is exposed on the surface. When crushing such a concrete structure using a rock jack crushing method and a method using a static crushing agent, the crushing work can be performed without the need for drilling work, so that noise, vibration,
There is no generation of dust, which is particularly useful for applications in areas adjacent to urban areas.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1A is a perspective view showing a concrete member of a temporary structure according to the present invention. FIG. 1B is an enlarged perspective view showing a pipe buried in a concrete member. In the temporary structure according to the present invention, the pipe 1 whose diameter is divided into a plurality of sections in advance is embedded in the concrete member 10 in consideration of the efficiency of dismantling work. This is because a hole for inserting a hydraulic lock jack or a static crushing agent is provided in advance at the time of dismantling. In this embodiment, the pipe 1 is described as a steel pipe, but the material of the pipe 1 can be appropriately selected according to the dismantling method to be applied. For example, when using a static crushing agent, a thermoplastic material is used.
When a hydraulic lock jack is used, a fragile material, metal flake, or the like that can be easily broken by the stress caused by the wedge of the jack is useful.

As shown in FIG. 1 (b), as a steel pipe 1 to be buried in a concrete member 10, a hollow pipe whose diameter section is divided into three or four is used. The shape of the steel pipe 1 is not limited to a cylindrical pipe as illustrated, but may be a square, a hexagon, or the like. In either case, however, a hole is formed and collapses due to the stress exerted by the wedge or static crusher of the hydraulic lock jack inserted into the pipe, effectively spreading the stress to the concrete member 10. Must be shaped. In addition, as a plurality of sections of the diameter cross section, about 3 or 4 sections are appropriate from the viewpoint of easy handling and the like, and the steel pipe divided into 3 or 4 sections is designed so that each part does not fall apart. Temporarily fix with tape.

[0010] The steel pipe 10 is arranged together with the rebar. The number of the steel pipes 10 to be buried is set to a number corresponding to the number of drill holes required for the demolition method in consideration of a method of demolition. Therefore, it is necessary to consider the dismantling method of the concrete structure of the present invention before construction.

It is preferable that the end of the steel pipe 10 be covered with a cap. This is to prevent the concrete from flowing into the pipe when the concrete is poured, and to prevent the appearance of the concrete structure from being deteriorated due to a large number of holes being opened. The cap placed on the end of the steel pipe 10 increases the strength of the steel pipe together with the tape for temporary fixing,
It also serves to prevent the steel pipe 1 from being crushed by the weight of the concrete to be cast.

A method for dismantling a temporary structure according to the present invention will be described below. Temporary structures constructed in areas adjacent to urban areas are subject to noise, vibration, etc. when dismantling.
Therefore, when the demolition method involving noise, vibration, and the like cannot be applied, the concrete member of the temporary structure is crushed by the rock jack type destruction method and the demolition method using a static crushing agent. Steel pipe 1 embedded in concrete member
If there are caps on the ends, remove them all first. Next, the piston or wedge of the hydraulic lock jack is inserted into the hole formed by the steel pipe 1 embedded in the concrete member, and the hydraulic pump is driven to extrude the piston or wedge. Since the steel pipe 1 is only temporarily fixed to a preliminarily divided one of three or four, the steel pipe 1 ruptures due to stress exerted by a piston or wedge inserted into the pipe. The stress caused by the hydraulic lock jack spreads to the concrete member due to the rupture of the steel pipe 1 and breaks it. When crushing a concrete member using a static crushing agent, a static crushing agent having a hygroscopic expansion property is filled into a hole formed by the steel pipe 1. When the charged static crushing agent undergoes a chemical change, the concrete member is crushed by the expansion pressure due to hydration expansion.

In the concrete structure according to the present invention, since the crushing operation can be performed using the hollow portion of the steel pipe 1, there is no need to perform a new drilling at the time of dismantling. For dismantling where noise, vibration, etc. are particularly problematic,
If a rock jack type destruction method or a dismantling method using a static crushing agent is used, the hollow portion of the steel pipe 1 can be used, so there is no vibration, dust, etc. for drilling, and dismantling in consideration of the surrounding environment is possible. It becomes possible. Further, since the drilling operation is not required, the cost for the demolition operation can be saved. If the temporary structure to be dismantled was constructed on a relatively large site, such as the Expo or Olympic facilities, and the noise, vibration, dust, etc. to the surrounding environment during dismantling do not pose a significant problem, the rock jack crushing method It is possible to apply not only the dismantling method using a static crushing agent but also various dismantling methods. For example, it is possible to load explosives using the hollow portion of the steel pipe 1 buried in the concrete member and crush the concrete structure by blasting.
Therefore, when a dismantling method requiring drilling is applied, drilling work can be omitted, so that significant cost savings can be achieved.

[0014]

The temporary structure according to the present invention is a concrete structure in which a pipe having a cross section of a plurality of diameters is buried so that one end is exposed on the surface, so that the temporary structure can be dismantled without requiring drilling. be able to. Therefore, it is possible to save the cost related to the drilling work, and it is possible to disassemble without noise and vibration depending on the dismantling method applied.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a concrete member of a temporary structure according to the present invention. (B) is a perspective view which expands and shows the pipe | tube embedded in the concrete member.

[Explanation of symbols]

 1. . . . . . Pipe (steel pipe) 10. . . . . . Concrete material

Claims (1)

[Claims] 1. A concrete structure in which a pipe having a cross section of a plurality of diameters is buried such that one end is exposed on the surface.