JP4549877B2 - Crushing method for reinforced concrete structures - Google Patents

Description

  The present invention relates to a method for crushing a reinforced concrete structure, and in particular, a method for crushing a reinforced concrete structure using a discharge crushing method for crushing an object to be crushed by a shock wave generated by a discharge of a coaxial electrode disposed through an insulator. About.

Conventionally, as a method of crushing large rocks or the like, as shown in FIG. 4, an electrode insertion hole 51 is formed in the rock 50, and an electrolytic solution 52 such as water is injected into the electrode insertion hole 51. Discharge crushing is performed by inserting a coaxial electrode 60 disposed through an insulator 51 into the coaxial electrode 60 and supplying a large current from the pulse power source 70 to the coaxial electrode 60 for discharge, and destroying the rock 50 by a shock wave generated by the discharge. A method has been proposed (see, for example, Patent Document 1). More specifically, the coaxial electrode 60 is insulated from a central electrode 63 connected to one electrode plate of a large-capacitance capacitor 72 charged by a power source 71 of a pulse power source 70 via a coaxial cable 61 and a connector 62. A peripheral electrode 65 disposed so as to surround the outer peripheral portion of the center electrode 63 via a body 64 and connected to the other electrode plate of the large-capacitance capacitor 72, and a pulse power source 70 by a switch 73. The electric charge charged in the large-capacity capacitor 72 is discharged between the center electrode 63 and the outer peripheral electrode 65, and the discharge causes the electrolyte solution 52 in the vicinity of the electrodes 63 and 65 to become plasma and generate a shock wave. The rocks around the electrodes 63 and 65 are destroyed.
JP 2003-320268 A

By the way, the electric discharge crushing method is also effective for crushing a concrete block such as a foundation of a building. If it is a certain size, the block of unreinforced concrete 80 is removed as shown in FIG. It can be efficiently crushed in order from the edge portion.
However, when the object is a structure made of reinforced concrete, the energy of the shock is absorbed by the reinforcing bars, and therefore the concrete 91 of the reinforced concrete structure 90 is crushed to some extent as shown in FIG. Although not only the crushing efficiency is reduced as compared with the unreinforced concrete 80, but also the rebar 92 arranged in a net shape on the peripheral edge of the concrete cannot be broken, so the rebar 92 remains as it is. It was difficult to dismantle the reinforced concrete structure 90 easily.

  The present invention has been made in view of the conventional problems, and an object of the present invention is to provide a method capable of easily dismantling a structure made of reinforced concrete using an electric discharge crushing method.

As a result of intensive studies, the present inventors have noted that, in a reinforced concrete structure, in general, the reinforcing bars are arranged only in the peripheral part of the structure, and the outer peripheral surface of the structure has the above-mentioned If the electric discharge crushing is performed after providing a cut portion that reaches the inside of the reinforcing bar, not only the structure can be efficiently crushed, but also part of the reinforcing bar is broken by the impact of the electric discharge crushing. The inventors have found what can be done and have arrived at the present invention.
That is, the invention described in claim 1 of the present invention is a method of fracturing a reinforced concrete structure reinforcement is Haisuji the peripheral portion, the outer peripheral surface of the structure, reinforcing bars are Haisuji the cut portion of the depth reaching to the inside than the position to form a plurality, Rutotomoni a plurality of regions surrounded by the cutting portions in the reinforced concrete structure, the electrode on the concrete of the respective regions surrounded by the cutting portions and drilling the insertion holes, the upper Symbol electrode insertion hole, and characterized in that is discharged by inserting the coaxial electrode disposed through an insulator, by the shock wave caused by the discharge so as to crush the structure To do.
According to a second aspect of the invention, the crushing method for reinforced concrete structure according to claim 1, said cut portion, characterized in that is provided so as to be separated the concrete and rebars.
The invention described in claim 3 is the crushing method for reinforced concrete structure according to claim 1 or claim 2, in providing the cut portion, so as to divide the rebar cut away a portion of the reinforcing bars It is characterized by that.

According to the present invention, when crushing the reinforced concrete structure reinforcement is Haisuji the peripheral portion, the outer peripheral surface of the structure, the cut having a depth reaching to the inside than the position where rebar is Haisuji A plurality of portions are provided to form a reflection surface (free surface) for the shock wave caused by the discharge, and an electrode insertion hole is drilled in the concrete in each region surrounded by the cut portion, and an insulator is interposed in the electrode insertion hole. The coaxial electrode arranged and discharged and discharged, and the structure was crushed by the shock wave due to the discharge, so that the concrete can be efficiently crushed and part of the rebar can be broken, Reinforced concrete structures can be easily dismantled.
In addition, when providing the notch portion, if broken away part of the reinforcing bars it is devised to divide the rebar, more efficiently, it is possible to break the reinforced concrete structure.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a method for crushing a reinforced concrete structure according to the best mode. In this example, a method for crushing a foundation 12 supporting a main body 11 of a pier 10 and dismantling the pier 10 will be described. To do. Here, as shown in FIGS. 2 (a) and 2 (b), the foundation 12 is composed of reinforced concrete in which a reinforcing bar 30 is arranged at the peripheral portion on the side surface 12b, 12c side of the concrete 20 in the cross section. It is assumed that only the rebar 30 on the side surface 12c side is shown in the figure.
When disassembling, first, after excavating the ground around the main body portion 11 to expose the base portion 12 from the ground surface to a predetermined thickness, the cut portion 40 is formed in the base portion 12 using a cutter or the like. To do. The cut portion 40 is usually provided by excavating the upper surface 12a and the side surfaces 12b and 12c of the base portion 12 to a depth reaching the inner side from the position where the reinforcing bar 30 is arranged. Since the area of 12a is large and the exposed portion is thick, the cut portion 40 is provided at the center of the upper surface 12a, and is also provided at the ground surface side of the side surfaces 12b and 12c. At this time, the reinforcing bars 30 arranged on the concrete 20 of the foundation 12 are also simultaneously cut by the cutter, so the reinforcing bars 30 themselves are also divided into a plurality of portions.
Next, a plurality of electrode insertion holes 51 for inserting the coaxial electrode 60 are excavated in the portion of the concrete 20 surrounded by the cut portion 40. In this example, the electrode insertion holes 51 are drilled at a pitch of about 500 mm, an electrolytic solution 62 such as water is injected into the electrode insertion holes 51, and then the coaxial electrode 60 is inserted into the electrode insertion holes 51. The pulse power source 70 to which the coaxial cable of the coaxial electrode 60 is connected may be mounted on the rear part of a loading platform such as a truck (not shown) stopped at a position away from the pier 10.

  Then, a large current is applied to the coaxial electrode 60, and a shock wave is generated by discharging between the center electrode 63 and the outer peripheral electrode 65 disposed via the center electrode 63 and the insulator 64, and the electrodes 63, Destroy 65 surrounding concrete 20. When the notch 40 is not present, the shock wave gradually attenuates in the process of spreading the bottom of the electrode insertion hole 51 from the center to the periphery of the base 12, but in this example, the notch is a free surface. Since the area 12m and 12n surrounded by the notch 40 in the upper part of the base part 12 (the part exposed on the ground surface) is reflected on the wall surface of 40, it is as if a shock wave is applied to the independent concrete block from the inside. It will be in the state made to act. That is, the shock wave is amplified and vibrates the entire regions 12m and 12n, so that the concrete 20 around the electrodes 63 and 65 can be efficiently crushed. In addition, since the reinforcing bar 30 is cut and cut by a cutter and is easily vibrated, a part of the reinforcing bar 30 is also broken by the amplified shock wave propagated to the peripheral portion of the base portion 12. Therefore, the dismantling work of the foundation part 12 can be performed more easily.

When the crushing of the upper part of the base part 12 is completed, the main body part 11 and the upper part of the crushed base part 12 are disassembled using a small breaker, a power shovel, etc. Remove concrete. FIG. 3A is a diagram illustrating a state after the dismantling work, and a portion of the broken reinforcing bar 30 remains on the peripheral edge of the concrete of the foundation 12 from which the upper part has been removed. When it is not necessary to remove all the foundation parts 12, the rebar 30 is broken and removed, and the dismantling operation is completed. Further, when all of the foundation part 12 is removed, as shown in FIG. 3 (b), the ground around the foundation part 12 is excavated and the remaining part of the foundation part 12 is exposed to the ground surface. Then, in the same manner as described above, cut portions 40 are provided on the top surface 12a ′ and the side surfaces 12b ′ and 12c ′ of the base portion 12, and the electrode insertion holes 51 are excavated in the concrete 20 surrounded by the cut portions 40. Then, the coaxial electrode 60 is inserted, a large current is supplied to the coaxial electrode 60, and the remaining portion of the base portion 12 is discharged and crushed.
Although the crushing of the foundation portion 12 of the pier 50 actually requires several stages of electric discharge crushing, depending on the size, in this example, in order to simplify the explanation, two discharges are required. It explained that it could be crushed by the crushing method.

  Thus, in this best mode, when crushing the foundation part 12 of the bridge pier in which the reinforcing bar 30 is arranged at the peripheral part, the reinforcing bar 30 is arranged in the foundation part 12 to a predetermined depth. An incision 40 deeper than the position is formed to separate the concrete 20 of the foundation 12 and the reinforcing bar 30, and an electrode insertion hole 51 is drilled in the concrete 20 inside the incision 40. Since the coaxial electrode 60 disposed through the insulator is inserted into the hole 51 and discharged, and the foundation portion 12 is crushed by the shock wave generated by the discharge, the concrete 20 of the foundation portion 12 can be crushed efficiently. At the same time, part of the reinforcing bar 30 can be broken, so that the pier 10 can be easily disassembled.

In addition, although the said best form demonstrated the case where the foundation part 12 of the bridge pier 10 was crushed by the electric discharge crushing method, this invention is not limited to this, The underground foundation in a building demolition construction, and an urban underground civil engineering construction Needless to say, the present invention can also be applied to a method of crushing a reinforced concrete structure in which reinforcing bars are arranged at the periphery.
In addition, there are various possible positions for the incised part in the reinforced concrete structure depending on the shape and strength of the structure. Are preferably separated, and it is more preferable if the reinforcing bars are cut. Further, the number and arrangement of the discharge locations are not limited to the above example, and are appropriately determined depending on the shape and strength of the structure.

  As described above, according to the present invention, a concrete structure in which reinforcing bars are arranged at the peripheral portion can be easily dismantled by using the electric discharge crushing method, such as a bridge or a foundation portion of a building. Dismantling can be performed easily.

It is a figure which shows the crushing method of the reinforced concrete structure which concerns on this best form. It is a figure which shows an example of the formation position of the notch part which concerns on this best form. It is a figure which shows the crushing method of the reinforced concrete structure which concerns on this best form. It is a figure which shows the structure of the crushing apparatus using a coaxial electrode. It is a figure which shows the crushing method of the concrete using a coaxial electrode.

Explanation of symbols

10 piers, 11 body parts, 12 foundation parts, 20 concrete, 30 reinforcing bars,
40 notch, 51 electrode insertion hole, 52 electrolyte, 60 coaxial electrode,
70 Pulse power source.

Claims (3)

A method rebar periphery crushing the Haisuji been reinforced concrete structure, the outer peripheral surface of the structure, forming a plurality of cut portions having a depth reaching to the inside than the position where rebar is Haisuji to, Rutotomoni a plurality of regions surrounded by the cutting portions in the reinforced concrete structure, the cut portion to drilling the concrete electrode insertion hole of each region surrounded by, in the electrode insertion hole, A method for crushing a reinforced concrete structure, characterized in that a coaxial electrode disposed via an insulator is inserted and discharged, and the structure is crushed by a shock wave generated by the discharge. The cut portion is crushed method of reinforced concrete structure according to claim 1, characterized in that is provided so as to be separated the concrete and rebars. When providing the cut portion, crushing method according to claim 1 or reinforced concrete structure according to claim 2 in a partially broken iron muscle is characterized in that so as to divide the rebar.

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