JPH11336338A - Reinforced concrete structure demolishing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of noise, vibration and dust consequent on demolition of a reinforced concrete structure. SOLUTION: In a method of demolishing reinforced concrete structures 10, (12) such as wall bodies having both faces 18, (20) facing each other with a single reinforcement assembly 16 embedded between both faces, a direct current is first sent between the reinforcement assembly 16 and a band area surrounding a part on each face. A plurality of holes 32 extended in current applied concrete parts 22, (24) are then bored, and an expanding agent 34 is filled in each hole 32 so as to crush each concrete part by the volume expansion of the expanding agent 34. Each concrete part is then removed, and a part of the exposed reinforcements assembly is cut off.

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 a reinforced concrete structure.

[0002]

2. Description of the Related Art Conventionally, in order to remove or remove a part or all of a reinforced concrete building, for example, walls, columns, beams, etc. of the reinforced concrete structure are suspended by a crushing device such as a breaker or a pick. Alternatively, it has been dismantled by cutting with a cutting device such as a diamond cutter.

According to this, it is possible to dismantle the reinforced concrete structure in a short time. However, on the other hand, there is a disadvantage that a great deal of noise, a great deal of vibration and a large amount of dust must be generated during disassembly.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the generation of noise, vibration and dust associated with the dismantling of a reinforced concrete structure.

[0005]

SUMMARY OF THE INVENTION The present invention provides a method of dismantling a reinforced concrete structure, such as a wall, having opposing surfaces and having a single rebar assembly embedded between the surfaces. In the disassembly, first, a direct current is passed between a band-like region surrounding a part of each surface and the reinforcing bar assembly. Next, a plurality of holes are formed to extend through each of the energized concrete parts, and each of the holes is filled with an expansive agent, thereby causing each concrete part to be crushed by volume expansion of the expansive agent. Then, each concrete part is removed, and a part of the rebar assembly exposed by this is cut off.

The present invention also provides a method of dismantling a reinforced concrete structure, such as a wall, in which two opposing reinforcing bars are embedded on both sides. In this disassembly method, after passing a direct current between the same band-like region on each surface of the structure and each reinforcing bar assembly, remove each energized concrete portion,
Thus, a part of each exposed rebar assembly is cut off. Thereafter, a plurality of holes are drilled in the remaining concrete portion, and each hole is filled with an expansive agent, and the volume expansion of the expansive agent causes the remaining concrete portion to be crushed, thereby removing the remaining concrete portion. Preferably, prior to removing the energized concrete portion, a plurality of holes are drilled in the concrete portion and each hole is filled with an expansive agent to cause fracturing by volume expansion of the expansive agent.

[0007] In another dismantling method according to the present invention for a reinforced concrete structure such as a wall in which the both reinforcing assemblies are buried, the energized two concrete portions and the remaining portion between these two concrete portions are provided. After drilling holes extending both with the concrete part, filling each hole with an expanding agent, and causing each concrete part to be crushed by volume expansion of the expanding agent, removing the energized concrete part, A part of each rebar assembly exposed by the above is cut off, and the remaining concrete part is removed.

Further, in another disassembly method according to the present invention for a reinforced concrete structure such as a wall in which both rebar assemblies are buried, the present invention provides a method for removing electricity, removing a concrete portion, and partially removing a rebar assembly. The process is repeated from one side of the structure to the other side. That is, first, a direct current is applied between a band-like region surrounding a part of the structure on one surface thereof and one of the reinforcing bar assemblies facing the band-like region, and the first concrete portion that has been supplied is removed. Then, a part of the one rebar assembly exposed by this is cut off. Thereafter, the same processing as in the first concrete portion is performed on the second concrete portion that has appeared by cutting off a part of the one reinforcing bar assembly. That is, energization is performed between the exposed surface of the second concrete portion and the other reinforcing bar assembly opposed thereto, the second concrete portion is removed, and a part of the other reinforcing bar assembly is cut off. . Thereafter, the remaining concrete part is removed. Preferably, prior to removal of the first concrete portion after energization or removal of the second concrete portion after energization, a plurality of holes are drilled in at least one of the concrete portions,
Each hole is filled with a swelling agent to cause crushing due to volume expansion of the swelling agent.

Further, the present invention provides a method for dismantling a reinforced concrete structure having a peripheral surface, such as a pillar, having a reinforcing assembly embedded along the peripheral surface. In the dismantling, a direct current is passed between the band-shaped region extending on the peripheral surface in the circumferential direction and the reinforcing bar assembly to remove a portion of the energized concrete, thereby cutting off a part of the exposed reinforcing bar assembly. After that, a plurality of holes are drilled from the peripheral surface of the remaining concrete portion, and each hole is filled with an expanding agent, causing the remaining concrete portion to be crushed by volume expansion of the expanding agent,
Thereafter, removing the remaining concrete portion. Also in this case, it is preferable that a plurality of holes are drilled in the energized concrete portion prior to its removal, each hole is filled with an expanding agent, and the concrete portion is crushed by volume expansion of the expanding agent. .

In another method of dismantling a reinforced concrete structure such as a pillar, a plurality of holes extending both in the energized concrete portion and the remaining concrete portion surrounded by the concrete portion are formed. The hole is filled with an expansive agent, and the two concrete portions are crushed by volume expansion of the expansive agent. Thereafter, the energized concrete portion is removed, a part of the exposed reinforcing bar assembly is removed, and the remaining concrete portion is removed.

Further, the present invention provides a reinforced concrete having a peripheral surface, such as a beam, composed of two opposing surfaces and one surface connected to the both surfaces, and a reinforcement assembly extending along the peripheral surface embedded therein. And a method for dismantling a structural structure.
In this method, first, a direct current is passed through a concrete portion between the band-shaped region extending in the circumferential direction on the peripheral surface and the reinforcing bar assembly. Next, the energized concrete portion is removed, and a part of the exposed reinforcing bar assembly is cut off.After that, a plurality of holes are drilled from the peripheral surface of the remaining concrete portion, and each hole is filled with an expanding agent. Causing the remaining concrete portion to fracture due to volume expansion of the expander, and then removing the remaining concrete portion.

Further, in another method of dismantling a reinforced concrete structure such as a beam, a plurality of holes extending to both the energized concrete portion and the remaining concrete portion surrounded by the concrete portion are formed by drilling a plurality of holes. After filling the hole with an expansive agent and causing crushing of both concrete portions due to volume expansion of the expansive agent, the energized concrete portion is removed, thereby cutting off a part of the exposed rebar assembly. Thereafter, the remaining concrete portion is removed.

The hole is preferably formed by subjecting the concrete portion to ultrasonic cutting.

[0014]

According to the present invention, according to the present invention, the energization reduces the strength (deterioration) of the concrete portion itself between the surface or peripheral surface of the reinforced concrete structure and the reinforcing bar assembly facing the same, and also reduces the strength. The adhesion strength of the concrete portion to the reinforcing bar assembly can be reduced. From this it can be seen that upon removal of the concrete part, the concrete part is pressed with less force, thus
Can be destroyed with less noise, vibration and dust generation. In addition, when a plurality of holes are drilled in the energized concrete portion, and each hole is filled with an expansive agent, and when the concrete portion is crushed due to volume expansion of the expansive agent, regarding the destruction of the concrete portion itself, This can be done with little noise, vibration and dust generation. At this time, if the drilling of the concrete portion is performed using ultrasonic cutting, the noise, vibration and dust associated with the drilling operation are reduced as compared with the case where the drilling is performed using a drilling device such as a drill or a diamond core drill. The generation level can be further reduced. Further, a part of the rebar assembly exposed by removing the concrete part is cut by a cutting tool such as a bolt gripper, gas fusing, or the like. It can be done without causing it. From these facts, it is possible to significantly reduce noise, vibration, and dust generation accompanying the dismantling of the reinforced concrete structure as compared with the related art.

Further, in the present invention applied to the dismantling of a reinforced concrete structure such as a wall, a band-like region surrounding a part of the surface of the reinforced concrete structure is cut out in the thickness direction of the structure. Therefore, a larger range of demolition can be performed with less removal of the concrete part and a part of the rebar assembly. Demolition of the reinforced concrete structure can proceed from both sides and one side of the structure as needed.

In the case of a reinforced concrete structure such as a pillar, the energization and the expansion agent are applied to a portion extending from the belt-shaped region extending in the circumferential direction on the peripheral surface of the structure to the axis of the structure. Due to the crushing due to the volume expansion and the partial cutting of the reinforcing bar assembly, the structure can be disassembled in a round slice under low noise, low vibration and low dust generation.

Further, even in a reinforced concrete structure such as a beam, a band-like region extending in the circumferential direction on a circumferential surface composed of two surfaces facing each other and one surface connected to the two surfaces of the structure is formed from the band-like region of the structure. In the part extending up to the axis, the energization, fracturing by volume expansion of the expanding agent, and partial cutting of the rebar assembly are performed, thereby making a cut across the axis of the structure to reduce noise, vibration, and volume. The dismantling of the structure under generation of dust can be performed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dismantling method according to the present invention has a reinforced concrete structure having two opposing surfaces, and one rebar assembly or a pair of opposing rebar assemblies embedded between these two surfaces. The present invention is applied to an object, for example, a wall body 10 (see FIGS. 1 to 13) in a reinforced concrete building. The present invention also relates to a reinforced concrete structure having a peripheral surface and having a reinforcing bar assembly buried along the peripheral surface, for example, a column 12 (FIGS. 14 to 18) in the building.
See). Further, the present invention has a peripheral surface defined by both surfaces facing each other and one surface connected to the both surfaces, and further, a reinforced concrete structure in which a reinforcing assembly extending along the peripheral surface is embedded, for example, Applied to beams (not shown) in the building.

The wall 10 includes concrete 14 and one or a pair of rebar assemblies 16 embedded therein (FIG. 7).
And FIG. 9). The reinforcing bar assembly 16 includes a plurality of vertical bars 15 and a plurality of horizontal bars 17 assembled in a lattice shape (see FIG. 4).
And the two sides 18, 2 defined by the concrete 14
It lies between 0 and faces each surface. However, for simplification of the drawings, FIGS. 7 and 8 show only one of the sixteen vertical bars of the reinforcing bar assembly, and FIGS. 9 to 12 show only one of the horizontal bars of each reinforcing bar assembly 16. Referring to FIGS. 1-6 shown, a wall 10 having one rebar assembly 16
Are shown.

First, on the respective surfaces 18, 20 of the wall body 10 (only one surface 18 is shown), the respective surfaces 18, 20 are shown.
A direct current is passed between the strip-shaped region surrounding a part of the reinforcing member 20 and the reinforcing bar assembly 16 (FIG. 1).

In the example shown in the figure, the band-shaped region is defined as each surface 1.
A plurality of cathode plates 26 are arranged on each of 8, 20 and are annular regions extending along four sides of a rectangular shape described later. A part of each of the surfaces 18, 20 surrounded by the band-shaped region is defined as a plurality of cathode plates. Reference numeral 26 denotes a substantially rectangular part surrounding the part. The band-shaped region is, in addition to the example shown in the figure, an arbitrary figure that defines a closed space,
For example, it may be an annular region extending along a circle, another polygon, or the like.

The energization causes the concrete portions 22,2 between the strips on each surface 18,20 and a portion of the rebar assembly 16 in the concrete opposite the strips.
4 deteriorates (FIG. 2). That is, the concrete parts 22 and 24 have reduced strength and cracks (not shown).
And the bond strength of each concrete portion 22, 24 to the reinforcing bar assembly 16 is reduced.
Reference numeral 25 indicates a portion on the surface 18 that is energized, that is, a deteriorated region.

The direct current is applied to each of the plurality (six in the illustrated example) of cathode plates 26 arranged along four sides of a virtual rectangle on each of the surfaces 18 and 20 of the wall body 10 and the wall. This is performed by applying a voltage from the DC power supply 28 to an arbitrary portion of the body 10 and a part of the reinforcing bar assembly 16 which is previously exposed by drilling a hole 27 with a drop.

The voltage, current and conduction time at this time are, for example, 50 V, ^{2 to} 5 A / m ² and 1 to 2 weeks, respectively.

The illustrated cathode plate 26 has a flattened rectangular parallelepiped shape as a whole, as shown in FIGS. Each cathode plate 26 has a container 29 having an open surface facing each surface 18, 20 of the wall body and in liquid-tight contact therewith, a grid-like cathode member 30 arranged in the container 29, and a container 29. Electrolyte solution (for example, magnesium chloride solution). However, FIG. 7 shows a state where one cathode plate 26 is arranged only on one surface 18 for simplification of the drawing. Also,
Preferably, as in the example shown, each cathode plate 26 is arranged so that it extends over the vertical and horizontal streaks of the rebar assembly 16.

The electrolyte in the container 29 gradually penetrates into the concrete portions 22 and 24, and through the permeated electrolyte,
The DC current flows through the concrete portions 22 and 24 from the reinforcing bar assembly 16 to the respective cathode plates 26.

Next, each energized concrete part 2
Drill a plurality of holes 32 extending from 2, 24 (FIG. 2). These holes 32 are, as in the example shown, in both concrete sections 2.
2, 24 extending continuously from one surface 18 to the other surface 20, or each concrete portion 22,
24 may extend from each surface toward the other surface.

The hole extending continuously between the concrete portions 22 and 24 extends from one surface 18 to the other surface 20 in order to reduce the flow of the expanding agent to be filled into the hole from the hole. It is desirable that the terminal end immediately before and extend horizontally.

The plurality of holes 32 can be arbitrarily arranged. In the illustrated example, the respective cathode plates 26 are arranged in a staggered manner with respect to the vertical bar 15 or the horizontal bar 17 of the reinforcing bar assembly 16 facing each other.

The hole 32 can be formed (perforated) by using a perforating device such as a drill or a diamond core drill, or by subjecting the concrete portion to ultrasonic cutting. The ultrasonic cutting can be performed using, for example, a sonodrill SS1-500 (manufactured by Taga Electric Co., Ltd.). When the ultrasonic cutting is performed, the levels of noise, vibration, and dust generated at the time of drilling are remarkably low as compared with the drilling performed by the drilling device.

After the perforation, each hole 32 is filled with a swelling agent 34 (FIG. 2). The swelling agent 34 has the property of expanding its volume over time.

The swelling agent is, for example, a mixture obtained by mixing water with an agent mainly composed of an inorganic compound mainly composed of quicklime and silicate (for example, "Blyster" manufactured by Onoda Co., Ltd.). The “blister” has a property that its volume expands with time by the reaction (hydration reaction) of the drug with water.

Other examples of the expanding agent include those of calcined dolomite, magnesia, ordinary Porland cement-blast furnace slag-bauxite-gypsum, alumina cement-lime-gypsum, and the like.

Due to the volume expansion of the expanding agent in each hole 32, the peripheral wall surface of the hole 32 receives an expansion pressure in the radial direction of the hole. The "blister" has about three times the volume expansion capacity. Due to the volume change of the expanding agent, a number of cracks 36, i.e., crushing, occur in each of the concrete portions 22, 24 (FIG. 3).

Thereafter, the concrete portions 22, 24 are removed.

Each of the concrete portions 22 and 24 where the crack 36 has occurred is easily broken down by applying a small force to the concrete portion 22 or 24, for example, by hitting with a hammer, and a large number of broken pieces can be easily removed. Accordingly, the concrete portions 22 and 24 can be easily removed, and can be performed under low noise, low vibration, and low dust generation. Both concrete parts 22,2
4 can be removed simultaneously or sequentially.

At least one concrete part 22,
When 24 is removed, a part of the rebar assembly 16 is exposed (FIG. 4). After the removal of the two concrete portions 22, 24, a part of the exposed reinforcing bar assembly 16 is cut off (FIG. 5). The resection uses gas fusing, bolt clippers, etc. to reduce noise,
It can be performed under low vibration and low dust generation.

When a part of the reinforced concrete assembly 16 is removed, an annular hollow portion 37 appears substantially between the two belt-like regions, and the concrete portion 38 surrounding the hollow portion 37 can be removed. The removal of the concrete portion 38 can also be performed under low noise, low vibration and low dust generation.

In this way, the hole 40 penetrating the wall body 10 is formed, and the partial disassembly of the wall body 10 is completed with this (FIG. 6).

In the same manner as described above, the disassembly of the wall in which the pair of rebar assemblies facing each other is embedded is performed on each surface of the wall in a band-like region surrounding a part thereof and each rebar. DC current is passed between the assembly and the energized, thereby degraded concrete portions, i.e., the concrete portions between each rebar assembly and the strip-shaped region on each side of the wall, thereby removing A part of each exposed rebar assembly is cut off.

Each concrete part degraded by energization can easily exert a relatively small force on it,
Also, it can be broken under low noise, low vibration and low dust generation, and can be removed by removing the broken pieces.

Prior to removing the concrete portion, a plurality of holes are formed in each surface of the wall in the same manner as described above, and each of the holes is filled with the expanding agent. Numerous cracks (fractures) can be generated in each concrete part due to volume expansion of the filler. This makes it possible to further reduce noise, vibration and dust generated when the concrete portion is broken or removed.

Next, a plurality of holes are formed in the remaining concrete portion, that is, the concrete portion between the exposed portions of the two rebar assemblies in the same manner as described above, and each hole is filled with the expanding agent. The remaining concrete portion is fractured by volume expansion of the expanding agent, and the remaining concrete portion is removed.

Instead of separately drilling holes in each of the concrete portion and the remaining concrete portion, after the energization, a plurality of holes extending through the energized concrete portion and the remaining concrete portion are provided. In addition, the holes can be filled with the expanding agent to cause a large number of cracks in each concrete part. In this method, after that, each of the energized and deteriorated concrete portions is removed, a part of each reinforced concrete is cut off, and the remaining concrete portions are removed.

As described above, for disassembly of the wall having the opposing rebar assemblies, energization, removal of both concrete portions, and partial resection of both rebar assemblies were performed from both sides of the wall. Alternatively, it can be performed from one surface to the other surface (FIGS. 9 to 13).

Referring to FIG. 9, a pair of parallel reinforcing bar assemblies 42, 44 opposed to both surfaces 18, 20 of the wall 10 are embedded in the wall 10.

To disassemble the wall 10, first, in the same manner as described above, a band-shaped region on one surface 18 of the wall is
A direct current is passed between one of the rebar assemblies 42 facing the band-shaped region (FIG. 9). Thereby, the band-shaped region,
The concrete portion (first concrete portion) 46 between the reinforcing bar assembly 42 and the reinforcing bar assembly 42 is deteriorated.

Next, the deteriorated concrete portion 46
Is removed. Preferably, as described above, prior to removal of the concrete portion 46, a plurality of holes 48 are drilled in the concrete portion (FIG. 10), each hole 48 is filled with the expanding agent, and the concrete portion 46 is filled with the expanding agent. Fracture due to volume expansion can occur. The hole 48 is desirably formed so as to be inclined and extend toward the horizontal or vertical bar of the reinforcing bar assembly 42. As a result, the volume expansion force toward the one surface 18 can be exerted on the portion surrounded by the hole 48, so that the concrete portion 46
Can be more easily peeled off from one of the reinforcing bar assemblies 42, and can be removed.

Next, a part of the one rebar assembly 42 exposed by removing the first concrete portion 46 is cut off in the same manner as described above.

Thereafter, between the exposed surface 50 of the concrete portion (second concrete portion) 49 that has appeared after the removal of a part of one of the reinforcing bar assemblies 42 and the other reinforcing bar assembly 44 facing the exposed surface. A DC current is passed through (FIG. 11). A hole extending from the exposed surface 50 of the second concrete to an arbitrary part of the reinforcing bar assembly 44 is formed in advance for connection of the anode terminal at the time of energization.

Next, in the same manner as described above, the second concrete portion 49 that has been degraded by energization is removed. Also in this case, preferably, prior to the removal of the concrete portion 49, a plurality of holes (not shown) are formed in the concrete portion, and each hole is filled with the expanding agent.
The swelling agent 9 can be crushed by volume expansion. Thereafter, the second concrete portion 49 is removed (FIG. 12).

Next, a part of the other reinforcing bar assembly 44 exposed by removing the second concrete portion 49 is cut off,
Thereafter, the remaining concrete portion 52 is removed. The concrete portion 52 can be relatively easily broken because a part thereof is fragile under the influence of the electric current. As a result, an annular hollow portion 5 similar to that described above is obtained.
4 appears (FIG. 13). The concrete portion 56 surrounding the hollow portion 54 is then removed.

Next, referring to FIG. 14 to FIG.
The dismantling method 2 will be described.

The column 12 is composed of concrete 14 for defining its peripheral surface and a reinforcing bar assembly 6 embedded in the concrete.
0 (see FIG. 16).

The illustrated column 12 has a rectangular cross section. The internal reinforcing bar assembly 60 includes a plurality of vertical bars 62 and a plurality of rectangular band bars 64 surrounding the vertical bars 62, and is arranged at a distance from the peripheral surface of the column 12 and extends along the peripheral surface. . The pillar to be dismantled may have, for example, a circular cross-sectional shape.

At the time of disassembly, first, a direct current is passed between the strip-shaped region extending in the circumferential direction on the peripheral surface of the column 12 and the reinforcing bar assembly 60 (FIG. 14). In order to connect the positive electrode to the reinforcing bar assembly 60, a hole 66 is provided in advance on an arbitrary surface of the column 12, and the positive electrode of the power supply 28 is connected to another stirrup 64.

In the example shown in the figure, four cathode plates 26 are arranged on four surfaces defining the peripheral surface of the column 12 so as to face the one streak 64 and extend along the one streak, respectively. The strip-shaped region includes an array region of the cathode plates 26 and is a ring-shaped region extending continuously in the circumferential direction on the peripheral surface of the column 12. The energization is performed under the same conditions as in the disassembly of the wall 10 described above. FIG. 15 shows a current-carrying region 68 on the peripheral surface of the column 12.

Next, the concrete portion 70 between the strip-shaped region and the reinforcing bar assembly 60, which has been degraded by energization, is removed.

As in the case of the wall 10, in order to facilitate the removal of the concrete portion 70, prior to the removal, the concrete portion 70 may be provided with a plurality of holes 72 opened to the peripheral surface of the column 12 ( (FIG. 15). These holes 72
Can also be arranged in a staggered manner along the stirrups 64. Drilling is performed in the same manner as in the wall 10. Next, each hole 72 is filled with a swelling agent, causing a number of cracks (not shown) or crushing in the concrete portion 70 due to the volume expansion of the swelling agent.

When a large number of fragments are removed and the concrete portion 70 is removed, a part of the reinforcing bar assembly 60 appears (FIG. 16). A part of the exposed reinforcing bar assembly 60 is cut off, and in the illustrated example, one stirrup and a plurality of main bars 6 intersecting therewith.
Cut off part of 2.

Next, a plurality of remaining concrete portions (concrete portions surrounded by the reinforcing bar assembly 60) 74 appearing after cutting off a portion of the reinforcing bar assembly 60 are opened to the peripheral surface (exposed surface) of the concrete portion. Drill holes 76. These holes may be composed of, for example, a through hole that opens on a pair of opposite surfaces of the exposed surface, and a non-through hole that opens on the other pair of surfaces but does not penetrate.

Thereafter, each of the holes 76 is filled with the expanding agent, and the volume of the expanding agent expands the concrete portion 74.
Causes a number of cracks 78 or fractures (FIG. 1)
7).

Next, the concrete portion 74 is removed by hitting and breaking the concrete portion 74 with a tool such as a bar, and removing a large number of crushed pieces generated thereby.

As a result, the plate-like portion including a part of the peripheral surface of the column 12 is removed, whereby the column 12 is separated into two parts in the longitudinal direction and disassembled.

Incidentally, the peripheral surface of the column 12 and the reinforcing bar assembly 6
0, the drilling of the concrete portion 70 and the drilling of the remaining concrete portion 74 are performed separately.
A plurality of holes extending through the concrete portions 70 and 74 or a plurality of holes extending across the concrete portions 70 and 74 are provided from the peripheral surface of the concrete portions 70 and 74, and these holes are filled with the expanding agent. 74 can be simultaneously fractured (cracked).

In this case, after the concrete portion 70 is removed, a part of the reinforcing bar assembly 60 is cut off, and the remaining concrete portion 74 is removed, and then the column 12 is dismantled.

The disassembly of the column body 12 is performed by the same method as that for the wall body 10, and this can be achieved under low noise, low vibration and low dust generation.

Further, the dismantling of the beam is also performed by the column 12
Can be carried out in substantially the same manner as the disassembly.

That is, first, a band-shaped region extending in the circumferential direction on the peripheral surface (consisting of both side surfaces facing each other and one bottom surface connected to the both side surfaces) of the beam, and a reinforcing bar set extending along the peripheral surface Pass a DC current between the three-dimensional object.

In the beam, unlike in the column, the peripheral surface and the band-like region have a U-shape when viewed in their cross sections. The reinforcing bar assembly includes a plurality of upper and lower main bars extending in the lateral direction and a plurality of stirrups.

At the time of energization, a cathode plate 26 is attached to each surface of the beam so as to face one of the stirrups, and the reinforcing bar assembly is previously applied to an arbitrary portion of the circumferential surface of the beam. Drill holes for connecting electrodes.

Thereafter, the energized concrete portion, that is, the concrete portion between the strip-shaped region on the peripheral surface and the reinforcing bar assembly is removed, and the exposed portion of the reinforcing bar assembly is cut off.

Next, a plurality of holes are made in the concrete portion and the remaining concrete portion exposed by partially cutting the reinforcing bar assembly, and each hole is filled with an expanding agent, and the remaining agent is expanded by volume expansion of the expanding agent. Causes concrete parts to fracture. Thereafter, the remaining concrete portion is removed. As a result, a plate-like portion including a part of the peripheral surface is removed from the beam, whereby the beam is divided into two parts and disassembled.

Prior to removing the energized concrete portion, a plurality of holes may be formed in the concrete portion, and each hole may be filled with the expanding agent. According to this, the energized concrete portion is crushed due to the volume expansion of the filler, and the concrete portion can be more easily removed.

After energization, a plurality of holes are formed in the energized concrete portion and the concrete portion or the remaining concrete portion surrounded by the rebar assembly to extend through both of these concrete portions. Filling the expanding agent, causing the crushing of both concrete portions due to volume expansion of the expanding agent, then removing the energized concrete portion, thereby cutting off a part of the exposed rebar assembly, Then, the remaining concrete part is removed. This also removes a plate-like portion from the beam, including a part of its peripheral surface and crossing the axis of the beam,
Thereby, the beam can be divided into two parts and disassembled.

The energization, the perforation, the removal of the concrete portion, and the cutting of the reinforcing bar assembly can be performed using the same means as in the above-described method of disassembling the wall and the column.

In this manner, the dismantling of the beam can be performed under low noise, low vibration, and low dust generation as in the case of the column 12.

[Brief description of the drawings]

FIG. 1 shows one surface of a wall on which a cathode plate is installed.

FIG. 2 shows the wall in a state in which a cathode plate is removed after energization, a plurality of holes are formed in an energization region, and each hole is filled with an expanding agent.

FIG. 3 shows the wall in a state in which a number of cracks have occurred due to volume expansion of the expanding agent.

FIG. 4 shows the wall in a state where a current-carrying portion is removed and a reinforcing bar assembly is exposed.

FIG. 5 shows the wall in a state where a part of the rebar assembly has been cut away.

FIG. 6 shows the wall after disassembly.

FIG. 7 is a schematic longitudinal sectional view of a wall body in a state where a cathode plate is installed.

FIG. 8 is a front view showing a cathode plate partially cut away.

FIG. 9 shows a state in which a cathode plate is installed on one surface of the wall in a method of disassembling the wall from one surface to the other surface.

FIG. 10 shows a state in which a wall is pierced from one surface after energization.

FIG. 11 shows a state in which the cathode plate has been installed again after removing a part of the wall body.

FIG. 12 shows a state in which the wall is further partially removed after re-energization.

FIG. 13 shows a state where a part of a wall is hollowed out.

FIG. 14 schematically shows a column on which a cathode plate is installed.

FIG. 15 shows a column in which a cathode plate is removed after energization and a plurality of holes filled with an expanding agent are formed in an energization region.

FIG. 16 shows the column in a state where a current-carrying portion is removed and a reinforcing bar assembly is exposed.

FIG. 17 shows the column with a part of the reinforcing bar assembly cut away.

FIG. 18 shows a state where the column is bisected.

[Explanation of symbols]

10, 12 Walls and pillars (reinforced concrete structures) 16, 42, 44, 60 Reinforcement assemblies 22, 24 Concrete parts 32 holes 34 Expanding agent

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigehide Sakurai 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head Office (72) Inventor Masahiro Takahashi 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Stock Company Kumagaya Gumi Tokyo head office

Claims (13)

[Claims] 1. A method of dismantling a reinforced concrete structure having both opposing surfaces and a reinforcing bar assembly buried between the two surfaces, comprising: a band-shaped region surrounding a part thereof on each surface; Passing a direct current between the assembly, drilling a plurality of holes extending through each energized concrete portion, filling each hole with an expansive agent, and causing each concrete portion to fracture due to volume expansion of the expansive agent. To make
A dismantling method comprising removing each concrete portion and thereby cutting off a portion of the rebar assembly exposed. 2. A method of dismantling a reinforced concrete structure having both opposing surfaces and having both opposing reinforcing members buried in the opposing surfaces, wherein a band-like region surrounding a part of each surface is provided on each surface. Passing a direct current between it and each rebar assembly, removing each energized concrete portion, cutting off a portion of each exposed rebar assembly, and forming a plurality of holes in the remaining concrete portion. Piercing,
A dismantling method comprising: filling each hole with an expansive agent, causing the remaining concrete portion to fracture due to volume expansion of the expansive agent, and then removing the remaining concrete portion. Further, prior to removing each of the energized concrete portions, a plurality of holes are drilled in the concrete portions, each hole is filled with an expanding agent, and each concrete portion is expanded by volume expansion of the expanding agent. 3. The disassembly method according to claim 2, comprising causing crushing. 4. A method of dismantling a reinforced concrete structure having both opposing surfaces and having both opposing rebar assemblies embedded therein, wherein each of the surfaces has a band-like region surrounding a part thereof. And passing a direct current between each reinforcing assembly, drilling a plurality of holes extending between each energized concrete part and the remaining concrete part between the two concrete parts, filling each hole with an expansive agent. Causing crushing of each concrete portion due to volume expansion of the expanding agent, removing each of the energized concrete portions, thereby cutting off a portion of each exposed rebar assembly, and then removing the remaining A demolition method comprising removing a concrete part. 5. A method of disassembling a reinforced concrete structure having both opposing surfaces and having both opposing reinforcing members buried on the both surfaces, wherein the band is formed on one surface and surrounds a part thereof. Passing a direct current between the area and one of the opposing rebar assemblies, removing the energized first concrete portion, thereby cutting off a portion of the exposed one rebar assembly; Passing a direct current between the exposed surface of the second concrete portion that has emerged after cutting off the one rebar assembly and the other rebar assembly facing it, removing the energized second concrete portion Dismantling, comprising: cutting off a portion of the other rebar assembly exposed thereby, and then removing the remaining concrete portion. 6. The method according to claim 1, further comprising: before removing the first concrete portion, drilling a plurality of holes in the first concrete portion, filling each hole with an expanding agent, and expanding the first concrete portion by volume expansion of the expanding agent. 6. The dismantling method according to claim 5, comprising causing crushing of the concrete part of the above. 7. The method according to claim 1, further comprising: before removing the second concrete portion, drilling a plurality of holes in the second concrete portion, filling each hole with an expanding agent, and expanding the second concrete portion by volume expansion of the expanding agent. 7. The dismantling method according to claim 5, comprising causing crushing of the concrete part of No. 2. 8. A method for dismantling a reinforced concrete structure having a peripheral surface and having a reinforcing bar assembly buried along the peripheral surface, comprising: a strip-shaped region extending on the peripheral surface in the circumferential direction; Passing a direct current between the reinforcing bar assembly and the energized concrete portion, removing a portion of the exposed reinforcing bar assembly, and then removing a plurality of portions from the peripheral surface of the remaining concrete portion. Dismantling method comprising: drilling holes, filling each hole with an expansive agent, causing fracturing of the remaining concrete portion by volume expansion of the expansive agent, and then removing the remaining concrete portion. . 9. Prior to removing the energized concrete portion, a plurality of holes are drilled in the concrete portion, each hole is filled with an expansive agent, and the concrete portion is crushed by volume expansion of the expansive agent. Claim 8.
The disassembly method described in 1. 10. A method for dismantling a reinforced concrete structure having a peripheral surface and having a reinforcing bar assembly embedded along the peripheral surface, the method comprising the steps of: Passing a direct current between the reinforcing bar assembly, drilling a plurality of holes extending between the energized concrete portion and the remaining concrete portion surrounded by the concrete portion, filling each hole with an expanding agent, Causing the crushing of both concrete parts by volume expansion of the expansive agent, removing the energized concrete part, thereby cutting off a part of the exposed rebar assembly, and then removing the remaining concrete part A disassembly method including removing. 11. Both surfaces facing each other and 1 connected to both surfaces
A method for dismantling a reinforced concrete structure having a peripheral surface defined by two surfaces and a reinforcing bar assembly extending along the peripheral surface embedded therein, comprising: Passing a direct current between the area and the rebar assembly, removing the energized concrete portion, thereby cutting off a portion of the exposed rebar assembly, and then passing the remaining concrete portion to the Drilling a plurality of holes from the peripheral surface, filling each hole with an expansive agent, causing fracturing of both concrete portions by volume expansion of the expansive agent, and then removing the remaining concrete portions, Demolition method. 12. The two opposing surfaces and one connected to both surfaces.
A method for dismantling a reinforced concrete structure having a peripheral surface defined by two surfaces and a reinforcing bar assembly extending along the peripheral surface embedded therein, comprising: Passing a direct current between the area and the rebar assembly; drilling a plurality of holes extending between the energized concrete portion and the remaining concrete portion surrounded by the concrete portion; Filling, causing crushing of both concrete parts by volume expansion of the expanding agent, removing the energized concrete part, thereby cutting off a part of the rebar assembly exposed, A dismantling method comprising removing a concrete portion of the building. 13. The hole is made by ultrasonically cutting the concrete portion.
The disassembly method according to any one of the above.