JPH07127286A - Method for demolishing reinforced concrete building - Google Patents

Abstract

PURPOSE:To enhance the efficiency of demolition by embedding force-applying bodies which are flexible hollow bodies in predetermined positions of concrete placed, and providing outside the concrete the nozzle hole of an injection pipe connected to each force-applying body. CONSTITUTION:When the concrete of a concrete building A is placed, long-size force-applying bodies 1 are embedded in the center lines of each beam B and each column C, each of the force-applying bodies 1 being made into a hollow body of spiral cross section from a flexible material, i.e., a thin metal 2. To demolish the building A, the delivery pipe of a hydraulic pump is connected to each nozzle hole to inject high-pressure oil into each force-applying body 1; then each force-applying body 1 is inflated and generates tensile force within the concrete to cut part of the concrete while generating a number of cracks D in each beam B and each column C, thus improving the separability of the concrete from reinforcement and a steel frame. The beams B and the columns C are then exerted with external force using a crusher to separate the concrete from the reinforcement and the steel frame, and the reinforcement and the steel frame are cut apart to demolish the building A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of dismantling an aged concrete building.

[0002]

2. Description of the Related Art Conventionally, the dismantling of concrete buildings is done by directly applying an external force with a steel ball, a crusher, a wire saw, etc., a method of crushing with a flame jet or electric current, and a chemical substance by drilling holes and filling it with chemical substances. Various construction methods have been used, such as a method of crushing by reaction body expansion.

[0003]

For example, the method of applying an external force by a crusher or the like gives a strong side, that is, a compressive force as a characteristic of concrete, so that the disassembling efficiency of the concrete and the reinforcing bars and the steel frame is poor and the dismantling efficiency is low.

An object of the present invention is to provide a method for dismantling a concrete building which improves the dismantling efficiency of concrete and reinforcing bars and steel frames to improve the dismantling efficiency.

[0005]

The first method of the present invention comprises:
At the time of concrete placing of a reinforced concrete building, a force applying body of a flexible hollow body is embedded in a predetermined place of the placed concrete, and an injection port of an injection pipe connected to the force applying body is provided outside or near the outside, and the concrete is At the time of dismantling a building, a liquid is injected into the force-applying body at a high pressure from the injection port and expanded to cause cracks in columns, beams, etc. to enhance the separability between concrete, reinforcing bars, and steel frames, and then the concrete building. It is characterized by applying external force to dismantle.

According to a second method of the present invention, at the time of concrete pouring of a reinforced concrete building, an expansive body of a flexible hollow body in which a thermal expansive material is enclosed is embedded in a predetermined portion of the cast concrete, and the concrete is poured. When demolishing a building,
It is characterized in that the expansive material is expanded from the outside by a heat means to generate cracks in a beam or the like to enhance the separability between concrete and reinforcing bars and steel frames, and then dismantle by applying an external force to the concrete building. .

A similar force-applying body may be embedded in the slab and used for the same purpose.

It is preferable that the force applying body is made of a thin metal material or a rubber material having sufficient strength.

Further, it is preferable that the liquid has fluidity such as oil and water and surely expands the force applying body.

The expansive body is preferably made of a thin metal material or rubber material having sufficient strength and is preferably formed in a capsule shape.

As the thermal expansion material, it is preferable to use a material that has a large expansion coefficient, that is, a material that undergoes a volume change (including a volume change due to a phase change) upon heating or cooling, that is, a material that expands.

Further, as the heating means, heating or cooling or heating by magnetic lines of force is used.

[0013]

In the method of the present invention, when a tensile force is applied to the concrete by expanding the force applying body and the expanding body, the concrete having a characteristic weak against the tensile force is effectively cracked, and the concrete and the reinforcing bar and the steel frame are separated from each other. Well separated. Therefore, the dismantling efficiency by the conventional method thereafter is improved.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, at the time of placing concrete in a concrete building A, long force bodies 1 are embedded in the center lines of the beams B and columns C, respectively. As shown in FIG. 4, the force-applying body 1 is formed of a flexible material, that is, a thin metal material 2 into a hollow body having a cochlear section. Note that the cross section of the force applying body 1a may be formed in a cross shape as shown in FIG. Further, rubber or the like can be used as the flexible material. In that case, the cross-sectional shape may be an appropriate shape such as a circle.

At the time of dismantling the building A, a discharge pipe of a hydraulic pump (not shown) is connected to the inlet 4 to inject high-pressure oil into the force applying body 1. Then, the force applying body 1 or the force applying body 1a expands as shown in FIG. 5 or FIG.
Occurs a lot, which improves the separability of concrete from steel bars and steel frames. This is because the tensile force is generated in the concrete due to the expansion of the force-applying body 1, and the concrete having a characteristic weak against the tensile force is partially cut.

Next, when an external force is applied to the beam B and the column C by a crusher, the concrete is suitably separated from the reinforcing bar and the column over the entire length. Therefore, the reinforcing bars and steel frames are cut and removed, and the building A is dismantled at another location.

FIG. 2 shows another embodiment of the present invention, the beam B
And embedding a short force body 1b at each end of the pillar C,
In this example, a crack D is generated as shown in the drawing, and the beam B and the column C are taken out as a large lump.

FIG. 3 also shows another embodiment of the present invention. Instead of the force applying body 1 described above, an expansive body 1A is buried in the upper end of a pillar C, for example, and the injection pipe 3 and the injection port 4 are omitted. It is an example.
The expander 1A is made of a thin metal material or rubber material similar to that of the force applying body 1 and is formed in a capsule shape.
Is enclosed. As the thermal expansion material E, a material having a large expansion coefficient, that is, a material that undergoes a volume change (including a volume change due to a phase change), that is, an expansion due to heating or cooling, is used. Then, for example, the expansive body 1A in which the thermal expansive material E by heating is enclosed is externally heated by the heating device 5 to be expanded to generate the crack D, and disassembled by improving the separability of the concrete, the reinforcing bar, and the steel frame. Improve efficiency. In addition to the electric heater, a magnetic force line generator can be used as the heating device 5.

[0020]

As described above, according to the present invention, the force applying body or the expanding body is expanded to suitably generate cracks in the concrete, and the separability between the concrete and the reinforcing bars and the steel frame is improved, and the dismantling efficiency is improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a side view illustrating an embodiment of the present invention.

FIG. 2 is a side view illustrating another embodiment of the present invention.

FIG. 3 is a side view illustrating another embodiment of the present invention.

FIG. 4 is a sectional view showing an example of a force applying body.

FIG. 5 is a sectional view showing the force applying body after expansion.

FIG. 6 is a cross-sectional view showing another example of the force applying body.

FIG. 7 is a sectional view showing the force applying body after expansion.

[Explanation of symbols]

 A ... Building B ... Beam C ... Column D ... Crack E ... Thermal expansion material 1, 1a, 1b ... Force applying body 1A ... Expansion body 2 ... Thin metal 3 ... Injection pipe 4 ... Injection port 5 ... Heating device or cooling device

Claims (2)

[Claims] 1. When placing concrete in a reinforced concrete building, a force applying body of a flexible hollow body is embedded in a predetermined place of the placed concrete, and an injection port of an injection pipe connected to the force applying body is provided outside or near the outside. Provided at the time of dismantling the concrete building, after injecting liquid from the injection port into the force-applying body under high pressure to expand and generate cracks in columns, beams, etc., to improve the separability between concrete and rebar, steel frame. A method for dismantling a concrete building, characterized in that the concrete building is disassembled by applying an external force. 2. When pouring concrete into a reinforced concrete building, an expansive body of a flexible hollow body in which a thermal expansive material is enclosed is embedded in a predetermined portion of the poured concrete, and when the concrete building is demolished, A concrete characterized in that the expansive material is expanded from the outside by a heat means to generate cracks in a beam or the like to enhance the separability between concrete, reinforcing bars and steel frames, and then dismantled by applying an external force to the concrete building. Building demolition method.