JPS6121271A - Destruction of concrete structure - 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] The present invention is applicable to, for example, buildings such as pills, roads and road bridge decks, nuclear power plant reactor protection walls, foundations of nuclear power plants and other power plants, The present invention relates to a concrete structure destruction method that can be applied to the destruction of all concrete structures including reinforcing bars and reinforcing bars and steel frames, such as various other concrete structures.

[Conventional technology]

The conventional method of destroying concrete structures is
There are various types such as hydraulic breakers, concrete cutters, rock splitters, lancets, powder jets, plasma jets, laser cutting methods, etc.

A hydraulic breaker uses hydraulic pressure as a driving source to cause impact rupture by stroking a rod, and is used as an attachment for a hydraulic excavator.

A concrete cutter is a saw with a diamond tip that rotates at high speed to cut.

A rock splitter is a device in which a rock is inserted into a hole that has been drilled in advance using a rock drill, etc., and the hole is expanded by hydraulic pressure to break the hole.

The lance bar is designed to be fused by the heat of oxidation of metal (iron or aluminum) and oxygen.

Powder jet is a method in which iron powder is mixed with oxygen in the oxygen-acetylene gas cutting method, and the heat of oxidation causes melting.

A plasma jet is a device that uses a plasma arc to cut an object.

In the laser cutting method, cutting is performed using a focused laser beam.

However, although the hydraulic breaker method is efficient in crushing unreinforced concrete, it is noisy, generates dust, and becomes less efficient when reinforcing steel is present.
There are drawbacks such as:
Disadvantages include the need for water for circular saw cooling, the need for noise suppression equipment, and the shallow cutting depth. Although the one-type rock splitter is not noisy, it has drawbacks such as requiring drilling in advance, being less effective when using bars, and requiring a breaker etc. for secondary crushing.
The one-type lance bar can cut reinforced concrete, but it has drawbacks such as the high cost of fuel rods, the need to develop an automatic fuel rod feeding device, and the generation of smoke and scattering of high-temperature molten material. Furthermore, the powder jet method has disadvantages such as slow cutting speed, generation of molten slab, risk of backfire if the tip is blocked, and smoke generation. Furthermore, the plasma jet method has a slow cutting speed, the nozzle requires water cooling,
The laser cutting method has drawbacks such as high electrode consumption, generation of large amounts of gas dust, and high cost.The laser cutting method is inefficient, and the torch cannot be pushed into the cutting surface, making it difficult to cut thick plates. It has drawbacks such as being difficult to irradiate the human body and being dangerous when irradiated to the human body.

[Problem that the invention seeks to solve]

There are various conventional methods for destroying concrete structures, as mentioned above, but each method has many problems. It is difficult to do this effectively, inexpensively, and safely.

The present invention aims to make it possible to destroy concrete structures efficiently, inexpensively, and safely, and to perform the work with low noise.

[Failure to solve the problem]

In the present invention, concrete is destroyed with a water jet, the exposed iron part is cut off using a metal cutting method, and once the iron part is cut and removed, the destruction of the concrete with a water jet is resumed, and the reinforcing steel is reinforcing in the same manner. Concrete structures, including concrete structures, etc., will be continuously destroyed.

〔Example〕

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

Figures 1 to 4 show an embodiment of the present invention, in which a jet is configured to inject high-pressure water pressurized by a hydraulic pump at high speed from a nozzle (2) at the tip and to be able to rotate. A lance (1) and a gas cutter (3) are prepared, and the jet lance (1) can spray high-pressure water at its tip slightly diagonally outward, as shown in Figures 3 and 4. The nozzle (2) is configured to be inclined so that the concrete (4) is destroyed within the range of the diameter of the high-pressure jet drawn as the jet lance (1) rotates.

Now, as shown in Figure 1, when trying to destroy a concrete structure containing reinforcing bars or steel structures (5), first destroy the concrete (4) using the water jet method using a jet lance (1). Destruction of. That is, by supplying high pressure water to the jet lance (1),
) without rotating it, gradually approach the direction of conch 11-) (4). Jet water is injected from the nozzle (2) at the tip of the jet lance (1), and as the jet lance (1) rotates, the jet water becomes large in diameter and hits the concrete (4). As a result, the concrete is cut by the impact force caused by the collision of the jet water, and the jet lance (1) is separated from the concrete (4).
By moving one stroke in the direction, the required depth can be destroyed. Depth of destruction at this one time α)
is approximately 10-15. , and the concrete is repeatedly destroyed using a water jet using these dimensions as shown in Figure 1.

High-pressure water is passed through the jet lance (1) and the target concrete is destroyed by the jet water, and when the reinforcing steel or steel structure (5) is exposed by repeating it several times, it is destroyed by the jet water from the jet lance (1). A gas cutter (3) is inserted into the groove (6) in the concrete (4) thus formed as shown in Fig. 2, and the reinforcing bars or steel structures (5) are gas cut and removed.

Rebar or steel structure (5) exposed in the groove (6) due to the above
When the concrete (4) is cut and removed, the jet lance (1) is inserted into the entire groove instead of the gas cutter (3), and the concrete (4) is gradually destroyed by the impact of the jet water in the same manner as described above.

When the destruction of the concrete IJ-) (4) progresses again as described above and the reinforcing bars or steel structures (5) are exposed, they are cut with the gas cutter (3) and the operation is repeated in the same manner. , it will destroy even fairly thick concrete structures.

The procedure of the above destruction method is as shown in the block diagram shown in FIG.

The method of the present invention includes not only the above embodiments but also the following cases. In other words, using only a jet lance,
To destroy concrete, high-pressure water is injected from the nozzle of the jet lance, and the concrete is destroyed while moving the jet lance forward as shown in Figure 1. When the destruction of the concrete progresses and the reinforcing bars or steel structures are exposed, an abrasive is mixed with high-pressure water and sprayed from the nozzle of the jet lance as an abrasive jet. Cut the structure.

Once the reinforcing steel or steel structure is cut, the water jet is used to cut the concrete again. Thereafter, concrete and reinforcing bars or steel structures are cut and destroyed using one nozzle in the same manner.

According to this embodiment, without using a gas cutter,
By selectively using a water jet and an abrasive jet ejected from one nozzle, it is possible to cut and destroy concrete structures including reinforcing bars, etc., and even thick concrete structures can be easily destroyed.

Furthermore, as an embodiment of the present invention, although FIGS. 1 and 2 above show a combination of cutting using a water jet and a gas cutter, it is also possible to use a one-type lance bar type and a powder jet type that can completely cut reinforcing bars or steel structures. Lance bar,
A powder jet or the like may also be used.

〔Effect of the invention〕

As described above, according to the concrete structure destruction method of the present invention, the concrete is destroyed only when the concrete is destroyed by the impact force generated by the jet of water, and the cutting of reinforcing bars, etc. contained in the concrete structure is performed only when the concrete is destroyed. Since the cutting and destruction of concrete structures is carried out by using methods that can be used to cut concrete structures, etc., it has the excellent effect of being able to work efficiently and safely with low noise, as well as being able to work at a low cost. obtain.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the state of concrete when it is destroyed, showing an embodiment of the present invention, Fig. 2 is a diagram showing an example of cutting reinforcing bars, etc., according to an embodiment of the present invention, and Fig. 3 is a side view of a jet lance. FIG. 4 is a view showing the tip end face of the jet lance, and FIG. 5 is a view showing the procedure according to one embodiment of the present invention shown in FIGS. 1 and 2. (1) Hashitsu transformer, (2) nozzle, (3) Hakasu cutter, (4) concrete IJ-to, (51 indicates reinforcing bars or steel structures.

Claims (1)

[Claims] 1) The concrete of a concrete structure containing reinforcing bars or steel structures is destroyed by hitting the jet water sprayed from the nozzle of the Jets Trans, and the metal cutting method is used only when the reinforcing bars or steel structures are exposed due to the destruction of the concrete. A method for destroying a concrete structure, characterized in that the reinforcing steel or the steel structure is cut using a steel reinforcing rod, and after cutting, the concrete is destroyed again using a jet transformer, and the process is repeated thereafter.