JPS6314963A - Construction method for disassembling reinforced concrete structure by current supply heating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Industrial Application Field" This invention is mainly used when creating an opening in a part of a reinforced concrete structure, by applying electricity to and heating the reinforcing bars in the area to be demolished, thereby reducing the strength of the concrete. This relates to a demolition method for reinforced concrete structures that are peeled off and dismantled.

"Prior art 1. Problems to be solved by invention" Generally,
In existing reinforced concrete apartments, etc., there are many cases where the desire is to add one room to the residence, either with a small number of rooms or more.Therefore, in public housing, etc., openings are created by demolishing part of the wall between adjacent residences. , construction work is increasing to combine the two and remodel them into a single residence.

However, in such conventional remodeling work, the concrete wall is directly destroyed using a breaker or the like, which causes severe vibration and noise, which can cause a great deal of inconvenience to residents living in the same building.

On the other hand, by heating the structural reinforcing bars of conventional reinforced concrete structures, the concrete surrounding each reinforcing bar thermally deteriorates and becomes brittle, and the rapid temperature gradient causes cracks to form and become brittle, which makes it easy to break. It is known that it is a demolition method that allows it to be dismantled.

In this construction method, the noise and vibration are lower than those that mechanically destroy reinforced concrete structures such as breakers, and the concrete surface is exposed to the reinforcing bars in order to connect the power electrode to the internal reinforcing bars. Also, since chiseling work is performed, there is a lot of noise and vibration as well as dust, which creates an extremely poor working environment.

There were problems such as the large amount of expense required for countermeasure equipment.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention makes holes in the reinforcing bars around the demolition range of concrete structures.
The reinforcing bars are exposed and cut, the concrete around the reinforcing bars is weakened by contacting the cut reinforcing bars with an electrode terminal and heating with electricity, and then the ends of the exposed reinforcing bars are connected to a tensioning device and pulled and dismantled. This paper proposes a demolition method for reinforced concrete structures that can be easily dismantled with low noise by peeling and breaking the concrete within a range.

"Embodiments" Below, embodiments of the present invention shown in the drawings will be described.
As shown in Fig. 2, holes 4.5 are drilled in a relatively thin reinforced concrete structure l such as a wall toward the structural reinforcing bars 2 in the vicinity of the demolition area using low-noise drilling a3, which are close to or merged with each other. At dawn, the reinforcing bars 2 are cut and the cut ends are exposed.

Then, cut I! as described above! lI? Electrodes 6.6 of a power source are brought into contact with both ends of the exposed reinforcing bar 2 as shown in FIG.
v, current 500 to IGOOA), preferably a high frequency current is applied to generate heat in the reinforcing bar 2.

In this way, the reinforcing bar 2 is heated to a relatively high temperature (for example, 400
By heating until it reaches ~500°C @ after),
This heat creates a sharp temperature gradient in the concrete around the reinforcing bars 2, causing cracks, and the surrounding concrete loses its adhesion to the reinforcing bars 2 and becomes brittle.

In this state, bend the end of the reinforcing bar 2 outward as shown in Figure 3, and use a tension device such as a lever jack to tighten this end. 17, and after connecting the gripping metal 8 to a reaction force support 9 such as a steel frame, the tensioning device 7 is activated to pull the reinforcing bars 2, and the concrete on the surface side of the demolition area is Peel off.

Then, in the same way, the concrete on the other side was peeled off,
After that, the intermediate concrete remaining in the core is cracked and weakened, so it can be easily destroyed with a hammer or the like, thereby demolishing the entire area to be demolished.

Since the demolished concrete is separated from the reinforcing bars 2 and crushed into small pieces, it can be easily disposed of, transported, etc.

Therefore, openings can be formed partially in the walls between adjacent residences such as reinforced concrete apartments to remodel them into a combined spacious residence.

FIG. 4 shows an example of a low-noise drilling machine 3 used in the present invention, in which a rotary shaft 12 is rotated by a motor 11 attached to the end of a thrust shaft 10 with a handle.
A cylindrical core body 13 is attached, and a diamond bit 14 is attached around its tip, and a guide pin 16 supported by a support plate 15 is attached to the rotating shaft 12 at its rear end. 1 by the spring attached to
It is attached so that it can be expanded and contracted back and forth about 0a+m.

A cylindrical soundproof cover 17 that surrounds the motor 11 and core body 13 is slidably attached to the thrust shaft 10 via a waterproof seal 18 at its rear end, and rubber or the like is attached around the tip opening of the soundproof cover 17. An annular suction pipe 19 with an arc-shaped cross section is attached, which is made of a soft elastic material.

A water supply valve 20 and a tree valve 21 are provided around the soundproof cover 17, and a water supply pipe 22 and a drain pipe 23 are connected to these, and an overflow drain port 24 is provided on the top surface of the soundproof cover 17. There is.

When drilling a hole in a concrete structure l using the hole drilling machine 3 having the above configuration, first align the tip of the guide pin 16 with the center of the hole, and then drive the motor 11 to drive the
0 is pressed forward, preliminary cutting is performed to make a circular cut to a depth of about 101 m in the concrete surface using the rotating core body 13.

After that, the guide pin 16 is attached to the rotating shaft 12 together with the support plate 15.
The core body 13, which is now empty, is fitted into the circular notch.

Next, the tip of the soundproof cover 17 is pressed against the concrete surface and adsorbed by the suction cup 19, and with the tip opening sealed, water is poured into the soundproof cover 17 from the water supply valve 20 to the drain port 2.
The core body 1 is filled to the full with overflowing from the core body 1, and water is sequentially drained from the drain valve 21 while continuing water supply.
Drill holes in the concrete according to step 3.

When penetrating this hole, a container-shaped waterproof receiver 25 is attached to the back of the concrete structure 1 and held by suction with a suction cup 26 similar to the above-mentioned suction cup 19 attached to the opening at its tip. As a result, water flowing out through the drilled hole is received and drained through a drain pipe 28 from a drain port 27.

By covering the periphery of the hole drilling machine body with the soundproof cover 17 filled with water, the noise during drilling can be significantly reduced.
In addition to low noise and vibration, it is possible to drill holes without generating dust, and the water used can be treated as wastewater without wetting the surrounding area.

``Effects of the Invention'' As described above, according to the present invention, holes are drilled around the demolition area of a reinforced concrete structure toward the internal reinforcing bars using a low-noise drilling machine, the reinforcing bars are exposed and cut, and the reinforcing bars are exposed and cut. After heating the concrete around the reinforcing bars in the demolition area to weaken it, the remaining exposed reinforcing bars are connected to a tensioning device and pulled, causing the concrete in the demolition area to partially peel and break. , the concrete in the demolition area can be partially weakened easily and with low noise! 1
In addition to being able to destroy the entire structure, the noise level during drilling can be kept low, and the demolition can be carried out smoothly without causing any pollution such as noise, vibration, or dust to nearby residents, and it is possible to dispose of demolished materials, transport, etc. It is also easy to process.

Furthermore, the labor and time required for disassembly can be significantly reduced, making it possible to perform disassembly work efficiently and economically in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an energized heating state according to the present invention;
FIG. 2 is a vertical cross-sectional view showing a hole drilling state, FIG. 3 is a vertical cross-sectional view showing a 2M# state, and FIG. 4 is a vertical cross-sectional view showing an example of a low-noise drilling machine. l... Reinforced concrete structure, 2... Rebar 3... Low noise drilling machine, 4, 5... Hole, 7... Tension device. Patent applicant: Maeda Construction Industry Co., Ltd.
Yoshio Kasai', 6. l
−、、、、＋ Agent Fujii
Actually, ゛)≦We-72亙L j Taka Yuki, q

Claims (1)

[Claims] A low-noise drilling machine is used to drill holes toward the internal reinforcing bars around the demolition area of the reinforced concrete structure, expose and cut the reinforcing bars, and heat the exposed reinforcing bars by applying electricity to remove the reinforcing bars within the demolition area. A method for dismantling a reinforced concrete structure by electrical heating, characterized in that after weakening the surrounding concrete, the ends of the cut exposed reinforcing bars are connected to a tensioning device and pulled, thereby peeling and breaking the concrete in the demolition area.