JPH0711778A - Demolition work method for reinforced concrete building - Google Patents

Abstract

PURPOSE:To enhance the demolition efficiency by improving the separation of concrete from reinforcements and steel frames. CONSTITUTION:Two pipes 1 are buried in deposited concrete, a columnar forcing metal fixture 10 is inserted into the pipes 1 at demolition, and a hydraulic cylinder 30 is provided between the end parts of the forcing metal fixtures 10 and 10. The hydraulic cylinders 30 is telescoped to apply tensile and compressive forces to the concrete to produce cracks effectively in the concrete which is weak in compressive force. Thus separation of the concrete from reinforcements and steel frames is improved to enhance the demolition efficiency.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art The demolition of reinforced concrete buildings has hitherto been carried out by directly applying an external force with a steel ball, a crusher, a wire saw, a method of crushing by a flame jet or an electric current, and a chemical substance obtained by drilling holes and filling 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.

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

[0005]

The first method of the present invention comprises:
During concrete pouring of reinforced concrete building, embed a pipe in the cast concrete, at the time of dismantling the reinforced concrete building, insert a force fitting into the pipe,
Characterized by applying a force through a force applying means through the force applying metal fitting to generate cracks in the concrete to enhance the separability between the concrete and the reinforcing bars and the steel frames, and then applying external force to the reinforced concrete building to dismantle it. I am trying.

According to a second method of the present invention, a through hole is formed in the skeleton concrete of a reinforced concrete building, and when the reinforced concrete building is dismantled, a force fitting is inserted into the through hole and the force applying metal fitting is used to insert the force fitting. Force by means of force,
It is characterized in that cracks are generated in the concrete to enhance the separability of the concrete from the reinforcing bars and the steel frames, and then the reinforced concrete building is disassembled by applying an external force.

It is preferable that the above-mentioned pipe is formed of a steel pipe and embedded in concrete by two pieces, or that the pipe is divided into two pieces and embedded in concrete by one piece.

Further, it is preferable that the force-applying member is formed of a columnar, U-shaped or U-shaped force beam connected by a hinge.

Further, the force applying means is preferably composed of a hydraulic cylinder.

[0010]

In the construction method according to the present invention, for example, two pipes embedded in concrete are respectively passed through columnar force fittings, and a hydraulic cylinder is interposed between both ends of the fittings. When this hydraulic cylinder is expanded and contracted and a tensile force and a compressive force are applied to the concrete through the force fitting, concrete is easily cracked due to the tensile force, and cracks are suitably generated, and the separability of the concrete from the reinforcing bars and the steel frames is enhanced. Therefore,
The dismantling efficiency by the subsequent conventional method is improved.

[0011]

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

FIGS. 1 to 3 show an embedded state of a pipe embodying the present invention. The pipe 1 is
At the time of concrete placing of the pillar C with steel pipe property, two pieces are embedded on the center line in the X direction, and in FIG. 4, two pieces are embedded on the line in the Y direction. Two are embedded parallel to the diagonal. The shape of the pipe 1 is arbitrary, such as circular or rectangular.

When dismantling, as shown in FIG. 6, the pipe 1,
Insert the force applying metal fittings 10 into the respective parts 1. This force fitting 1
0 has a columnar shape, and yoke portions 11 are formed at both ends. A hydraulic cylinder 30, which is a force applying means, is interposed between the yoke portions 11, 11. In this state, if the hydraulic cylinders 30, 30 are expanded and contracted and the tensile force and the compressive force in the directions of arrows A and B are alternately applied to the concrete through the force fittings 10, 10, it is effective for the concrete which is weak against the compressive force. Cracks occur. Therefore, the separability of concrete from reinforcing bars and steel frames is enhanced,
The dismantling efficiency is improved by the conventional method thereafter.

FIG. 7 shows another embodiment of the force fitting and the force applying means, in which the pressure fitting 12 is formed in a U-shape connected by a hinge 13, and between the yoke parts 11 and 11 at both ends thereof. This is an example in which the hydraulic cylinder 30 is interposed and the tensile force and the compressive force in the directions of arrows A and B are alternately applied to the concrete by the expansion and contraction of the hydraulic cylinder 30.

FIG. 8 also shows another embodiment of the force fitting and the force applying means. The force fitting 14 is formed in a columnar shape, and the hydraulic cylinder 30 is interposed between the yoke portions 11, 11 formed at one end thereof. , The expansion and contraction of the hydraulic cylinder 30 makes the arrow A on the concrete,
In this example, a tensile force and a compressive force in the B direction are applied.

9 to 11 show another pipe embedded state. The split pipe 2 is formed by splitting a steel pipe into two at a gap 3. This two-split pipe 2 has a gap 3,
3 is embedded in the Y direction, one in the X direction in FIG. 12, and one in the X direction in FIG.
It is embedded in parallel with the diagonal line of the pillar C.

When dismantling, as shown in FIG. 14, the pipe 2
Insert the force fittings 15, 15. This force fitting 15
Is formed in a columnar shape, and yoke arms 16 and 16 are fixed to both ends thereof, respectively. Those yokes 16,
A hydraulic cylinder 30 is provided on the same side of 16. In this state, the hydraulic cylinders 30, 30 are expanded and contracted to generate cracks in concrete as in FIG.

FIG. 15 shows another embodiment of the force applying metal member and the force applying means. The force applying metal member 17 is formed in a V shape connected by a hinge 18, and a yoke portion 19 is formed at both ends thereof. This is an example in which a hydraulic cylinder 30 is interposed between the yoke portions 19 and 19 and a tensile force in the direction of arrow A is applied to concrete by the expansion of the hydraulic cylinder 30.

FIG. 16 also shows another embodiment of the force applying metal fitting and the force applying means. The force applying metal fitting 20 is formed in a columnar shape, and a yoke portion 21 is formed at one end, and two force applying metal fittings 20, 20 are provided. Pipe 2
This is an example in which a hydraulic cylinder 30 is inserted between the yoke parts 21 and 21 and a tensile force in the direction of arrow A is applied to the concrete, as in FIG.

FIG. 17 shows an example in which the present invention is applied to a slab S. In this embodiment, two pipes 1 are embedded in the slab S and the same force fittings 10 and 10 and hydraulic cylinders 30 and 30 as in FIG. And are used.

FIG. 18 also shows an example in which the present invention is applied to a slab S. In this embodiment, the split pipe 2 is embedded in the slab S, and the same force fittings 15, 15 and hydraulic cylinders 30, 30 as in FIG. And are used.

FIG. 19 shows another embodiment of the force applying fitting and the force applying means. The U-shaped force applying beam 22 and the hydraulic cylinder 31 are integrally connected to each other, and two pipes 1 embedded in the slab S are provided. The end portions 22a and 22a of the force beam 22 are inserted into the force beam 22 from below, the reaction force receivers 23 are fixed to these force beams 22, the hydraulic cylinder 31 is extended, and a force in the direction of arrow C is applied to the slab S. This is an example of crushing.

FIG. 20 also shows another embodiment of the force applying metal fitting and the force applying means, in which hydraulic cylinders 31 are provided at both ends of the T-shaped force applying beam 24, and the central column portion 25 of the force applying beam 24 is slab. The reaction force receiver 23 is fixed to the end by inserting the pipe 1 embedded in S from the lower side, and the hydraulic cylinders 31, 31 are extended to form an arrow C.
This is an example in which the slab S is crushed by applying a directional force.

FIG. 21 also shows another embodiment of the force fitting and the force applying means, in which the U-shaped force beam 26 and the hydraulic cylinder 32 are integrally connected to each other, and the pipe 1 embedded in the slab S is hydraulic cylinder. The piston rod 32a of 32 is inserted from the lower side to fix the reaction force receiver 23 to the end portion, and both end portions 26a and 26a of the force beam 26 are brought into contact with the lower surface of the slab S to contract the hydraulic cylinder 32 to move the arrow. This is an example in which the slab S is crushed by applying a force in the D direction.

FIG. 22 also shows another embodiment of the force applying fitting and the force applying means. Hydraulic cylinders 32 are provided at both ends of the T-shaped force applying beam 27, and the central column 28 of the force applying beam 27 is slab. Abutting on the lower surface of S, the piston rod 32a of the hydraulic cylinder 32
In the example in which the pipe 1 embedded in the slab S is inserted from the lower side to fix the reaction force receiver 23 to the end, the hydraulic cylinder 32 is contracted, and the slab S is crushed by applying the force in the direction of the arrow D. is there.

Further, instead of embedding the pipe 1 and the split pipe 2, a through hole is bored in the pillar C and the slab S, and the force fitting and the force applying means are used for the through hole. Further, the through hole may be formed by embedding a paper or wooden pillar that forms the through hole during concrete pouring, and removing the pillar after solidification or dismantling of the concrete to form the through hole.

[0027]

As described above, according to the present invention, a force fitting is inserted into a pipe embedded in concrete or a through hole formed in concrete to apply force to generate cracks, and concrete, rebar, and steel frame It is possible to improve the dismantling property and improve the dismantling effect and enable dismantling with a relatively small equipment.

[Brief description of drawings]

FIG. 1 is a front view of a column showing an embedded state of a pipe for carrying out the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a horizontal sectional view of FIG.

FIG. 4 is a front view of the column showing another embedded state of the pipe.

FIG. 5 is a horizontal sectional view of a column showing another embedded state of the pipe.

FIG. 6 is a horizontal cross-sectional view of a column showing an example of a force fitting and a force applying means.

FIG. 7 is a horizontal cross-sectional view of a column showing another example of the force fitting and the force applying means.

FIG. 8 is a horizontal cross-sectional view of a column showing another example of the force fitting and the force applying means.

FIG. 9 is a front view of a column showing a buried state of a split pipe.

FIG. 10 is a side sectional view of FIG.

11 is a horizontal sectional view of FIG.

FIG. 12 is a front view of a column showing another embedded state of the split pipe.

FIG. 13 is a horizontal cross-sectional view of a column showing another embedded state of the split pipe.

FIG. 14 is a horizontal cross-sectional view of a column showing an example of a force fitting and a force applying means for a split pipe.

FIG. 15 is a horizontal cross-sectional view of a column showing another example of the force application fitting and the force application means for the split pipe.

FIG. 16 is a horizontal cross-sectional view of a column showing another example of the force application fitting and the force application means for the split pipe.

FIG. 17 is a vertical sectional view of a slab showing an example of a force fitting and a force applying means for the slab.

FIG. 18 is a vertical cross-sectional view of a slab showing another example of the force fitting and the force applying means for the slab.

FIG. 19 is a vertical sectional view of a slab showing another example of the force fitting and the force applying means for the slab.

FIG. 20 is a vertical cross-sectional view of a slab showing another example of the force fitting and the force applying means for the slab.

FIG. 21 is a vertical cross-sectional view of a slab showing another example of the force fitting and the force applying means for the slab.

FIG. 22 is a vertical sectional view of a slab showing another example of the force fitting and the force applying means for the slab.

[Explanation of symbols]

 C ... Pillar S ... Slab 1 ... Pipe 2 ... Divided pipe 3 ... Gap 10, 12, 14, 15, 17, 20 ... Force-fitting metal fitting 11, 19, 21・ ・ ・ Yoke part 13, 18 ・ ・ ・ Hinge 16 ・ ・ ・ Yoke arm 22, 24, 26, 27 ・ ・ ・ Force beam 23 ・ ・ ・ Reaction force receiving 25, 28 ・ ・ ・ Central pillar part 30, 31 , 32 ... Hydraulic cylinder 32a ... Piston rod

Claims (2)

[Claims] 1. A pipe is embedded in the cast concrete during concrete pouring of a reinforced concrete building, and when the reinforced concrete building is dismantled, a force fitting is inserted into the pipe and a force applying means is applied through the force fitting. A method for dismantling a reinforced concrete building, characterized in that the reinforced concrete building is demolished by applying an external force to the reinforced concrete building by applying a force to generate cracks in the concrete to improve the separability of the concrete, the reinforcing bar and the steel frame. 2. A through hole is formed in the skeleton concrete of a reinforced concrete building, and when the reinforced concrete building is dismantled, a force-applying metal fitting is inserted into the through-hole, and a force applying means applies force through the force-applying metal fitting. Then, a method for dismantling a reinforced concrete building is characterized in that a crack is generated in the concrete to enhance the separability between the concrete, the reinforcing bar and the steel frame, and then the reinforced concrete building is disassembled by applying an external force.