JPH0548354B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Application Field The present invention relates to a demolition device for reinforced concrete structures.

Conventional Technology Conventionally, there have been two types of demolition methods for reinforced concrete structures: the direct demolition (destruction) method and the combined direct and indirect demolition method.

Direct demolition methods include demolition methods that use external mechanical impact such as hand tools, breakers (pick hammers), rock drills, and steel balls, and hydraulic demolition methods such as rock jacks, hydraulic concrete pile crushers, diamond cutters, and hammering machines. Demolition methods using levers and other simple machines, demolition methods using flames such as thermite method and jet flame method, demolition methods using dynamite, concrete crushers, and other explosives, and expansion methods such as gas crushing method, Kardox method, quicklime crushing method, etc. Demolition methods using pressure, demolition methods using electrical methods such as electrical heating of reinforcing bars, induction heating of reinforcing bars, dielectric loss method, electromagnetic wave method, arc heat cutting method, laser beam method, and injection excavation methods such as sand jet method and water jet method. There are demolition methods such as washing.

In addition, direct and indirect demolition methods include destroying joints and joints between columns and beams, removing joints and dismantling each component separately, and methods in which the columns and beams are destroyed by the impact of falling. be.

Problems to be Solved by the Invention However, the demolition method using external mechanical shock or simple machines has problems such as noise, vibration, and dust generation. When using expansion pressure or electrical methods, it is difficult to adjust the demolition time to suit the work process, and when using spray excavation, there are problems such as noise and vibration. .

Furthermore, the combination of direct and indirect demolition methods is laborious and time-consuming, resulting in high costs.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to provide a demolition device for reinforced concrete structures that can perform work safely without vibration or noise.

[Structure of the Invention] Means for Solving the Problems The device for dismantling a reinforced concrete structure of the present invention includes a case with an open end on one side that is inserted into a hole in concrete that exposes reinforcing bars, and a case with an open end inside the case. an electrolytic spacer inserted between the negative electrode and the reinforcing bar, an electrolytic solution infiltrated into the electrolytic spacer, a positive electrode connected to other parts of the reinforcing bar, and both of the above electrodes. The device is characterized in that it is comprised of a DC power source that supplies DC to the

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a concrete structure in which reinforcing bars 2 are arranged. Reference numeral 3 denotes a cylindrical case with an open end on one side, and a hole 1 made in the concrete structure 1 to expose the reinforcing steel 2.
It is inserted into a. An electrode tube 4 serving as a negative electrode is inserted through the case 3. Reference numeral 5 denotes an electrolytic spacer that separates the reinforcing bar 2 and the electrode tube 4 so that they do not come into direct contact with each other, and is made of a porous insulator through which an electrolytic solution can penetrate. A compression spring 6 elastically presses the electrode tube 4 against the electrolytic spacer 5. Reference numeral 7 denotes an electrolyte supply device, which supplies an electrolyte through the electrode tube 4 into the case 3, that is, into the hole 1a. 3a is a drain port for recovering the used electrolyte in the hole 1a. In addition, the electrolyte is case 3
A hole drilled in the hole (may also be used as the drain port 3a above)
Alternatively, the electrode tube 4 may be supplied into the case 3, that is, into the hole 1a, and in this case, the electrode tube 4 need not be a tube.

8 is a DC power supply, whose positive electrode side is
It is connected to the reinforcing bar 2 exposed through a hole drilled approximately in the center of the surface to be dismantled, and the negative electrode side is connected to the electrode tube 4.

Next, a disassembly method using the apparatus of the above embodiment will be explained.

First, after examining the reinforcing condition of the concrete structure 1 to be demolished, and taking care to minimize the number of reinforcing bars to be cut, for example, as shown in Figure 2, holes are cut along the periphery of the surface to be demolished. 1a and a hole 1b approximately in the center thereof to expose the reinforcing bar 2 inside. As shown in FIG. 1, a power supply spacer 5, a case 3, and an electrode tube 4 are inserted into a large number of surrounding holes 1a, respectively.
and so on, connect the electrolyte supply device 7 to the electrode tube 4, and connect the negative side of the power source 8.

On the other hand, the positive side from the power source 8 is connected to the reinforcing bar 2 exposed in the central hole 1b. Furthermore, the electrolyte is supplied from the electrolyte supply device 7 into the hole 1a.

As an electrolyte, conductive liquids, acids,
Either alkali or salt may be used, but to speed up cutting, it is better to use something that dissolves iron oxide, such as hydrochloric acid or sulfuric acid.Also, to make the reinforcing steel expand and cause concrete to crack faster, it is better to use something that dissolves iron oxide. First, calcium nitrite, which forms a swelling product, is preferred.

Furthermore, as a power source, the diameter of the reinforcing bar is 9 to 13 mmφ.
If so, it will be possible to disconnect in 1 to 2 hours at 12A and 25V, so in the end, the cutting point x required amperage (e.g.
12A), 25V power is required. Note that the cutting time can be changed by adjusting these currents and voltages.

Applying direct current to the reinforcing bars 2 and electrodes 4 as described above,
When the electrolyte is filled during this time, the reinforcing bar 2 undergoes an oxidation reaction, producing iron oxide (ferrous oxide and ferric oxide), which dissolves in the electrolyte depending on the type of electrolyte as described above. It can break, rust, and expand, causing cracks in the concrete and allowing the concrete structure to be demolished.

In addition, when rusting and expansion are used, it can also be applied to static crushing of unreinforced concrete, rocks, etc.

[Effects of the invention] (1) Adjustment is possible from a small area to a large area, and partial disassembly is possible.

(2) By adjusting the voltage and current magnitude according to the work process, it is possible to adjust the dismantling time from a short time (1 to 2 hours) to a long time (all day and night).

(3) It is a vibration-free and noise-free reinforced concrete demolition equipment.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the apparatus of the present invention, and FIG. 2 is an explanatory diagram of its usage state. 1... Concrete structure, 1a, 1b...
hole, 2... reinforcing bar, 3... case, 4... electrode tube,
5... Electrolytic spacer, 6... Compression spring, 7...
Electrolyte supply device, 8...DC power supply.

Claims (1)

[Claims] 1. A case with one end open to be inserted into a hole in concrete with exposed reinforcing bars, a negative electrode facing into the case, and an electrolytic spacer inserted between the negative electrode and the reinforcing bars; Demolition of a reinforced concrete structure characterized by comprising an electrolytic solution infiltrated into the electrolytic spacer, a positive electrode connected to other parts of the reinforcing steel, and a DC power source that supplies DC to both of the electrodes. Device.