JPS62181898A - Method of cutting reinforced 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 (Field of Industrial Application) The present invention relates to a method for cutting reinforced concrete structures.

(Prior Art) As a method for cutting structures, a crushing method using explosives has conventionally been used.

Recently, a melt cutting method using a laser beam has also been proposed.

(Problems to be Solved by the Invention) However, although the crushing method using explosives is effective in the case of structures that are not reinforced with reinforcing bars, accurate crushing cannot be expected. In addition, this method is called cutting, but does not result in total crushing, and generates a lot of dust, vibration, and noise.

Furthermore, in the case of reinforced concrete structures, since the reinforcing bars cannot be cut, they must be cut using another method, resulting in a complicated and large-scale cutting method.

Furthermore, in the case of melt cutting using a laser beam, a highly viscous melt is generated by the laser beam in the cutting groove of the structure, making the melt cutting difficult.

(Means for Solving the Problems) The present invention has been proposed to solve the above problems. Immediately after the reinforced concrete structure to be cut is melted by a laser beam, This method relates to a method for cutting a reinforced concrete structure, characterized in that an explosive bullet shaped into granules is fired into the structure, and the bullet is exploded by the energy of a laser beam to locally fracture a small portion of the structure. .

(Function) As described above, in the present invention, immediately after the reinforced concrete structure is melted by irradiation with a laser beam, a bullet formed into granules is driven into the structure, so that the bullet is formed into the structure by the oscillation of the laser beam. The bullet passes through the cut groove and collides with the highly viscous molten material that has formed at the bottom of the groove, causing the molten material to scatter, and the bullet stops in the molten pot due to energy exchange between the bullet and the scattered molten material.

At the same time, the bullet is irradiated with a laser beam, and the bullet absorbs the energy of the laser beam and explodes, destroying the portion of the structure along the cut groove.

In this way, a new exposed surface is created in the cut groove of the structure, and since the same surface is irradiated with the laser beam, melt is generated again.

The above cycle is then repeated to cut the structure.

(Effects of the Invention) According to the present invention, a reinforced concrete structure is melted with a laser beam, a bullet formed into granules is shot into the melting pot, and the bullet is exploded with a laser beam to cut the structure. A local wave that accurately controls the powerful destructive force of gunpowder by removing cutting grooves! 11 to improve the cutting efficiency and precision of the structure.

(Example) The present invention will be described below with reference to the illustrated embodiments.

Fig. 5 shows a cutting device for reinforced concrete structures used in the method of the present invention, where υ is a laser beam oscillation head, and the laser beam (L) oscillated by the head (1) cuts the reinforced concrete structure. Body (C)
It is designed to melt and cut.

(2) is a gun barrel for firing a bullet that is projected onto the melted cutting groove formed in the structure (q) according to the direction of the laser beam, and a pair of infrared detectors (3) are placed between the tip of the gun barrel (2).
) are provided.

The detector (3) is constructed by mounting an infrared sensor with a lens mechanism and a signal transmission coat 9 connected to the front and rear of a cylinder, respectively, and detects the highly viscous melt generated in the structure (C) by the laser beam. (b) Of the infrared rays generated, the infrared rays that should be detected are detected. The infrared rays that have passed through the lens mechanism are detected by an infrared sensor and sent to a microcomputer (not shown) via a signal transmission cord. 3) Determine which direction is oriented with respect to the melt (b). As mentioned above, both detectors (3) are connected to the gun barrel (2).
Since the axis of the gun barrel (2) is fixed at the entire center and aligned with the molten material (b), the gun barrel is controlled by a direction control mechanism (not shown) that receives signals from a pair of left and right infrared detection sensors. Align the axis of (2) with the position of the melt (b).

Note that since the position of the melt (W) constantly changes, the relationship between the laser beam (L) and the gun barrel (2) must be constantly corrected.

(4) is a bullet tank, and (5) is a bullet feeding pipe that connects the tank (4) and the bullet feed control device (6). A vibrator (7) is attached to the lower end of the tank (4) in order to ensure reliable delivery. Since the tank (4) is a gravity feeding device, it is always held vertically by a universal joint (not shown) or the like. Also, since the laser beam oscillation head (1) faces various directions, the bullet supply pipe (5) is a flexible pipe.
configured.

The bullet feed control device (6) has a main body with a circular cross section in which the gun barrel (2) and the bullet feeder and two tubes (5) communicate with each other in the front and rear, and a rotating cylinder concentrically connected to the rotating shaft of the stepping motor (8). A plurality of partition pieces are protruded radially from the rotating cylinder at equal intervals, a bullet accommodation space is partitioned between the partition pieces, and a through hole is formed in the inner wall surface of the rotating cylinder in each space. A compressed air injection nozzle is provided in the rotary tube, and is further disposed on the extension of the central axis of the gun barrel (2), facing the through hole of the rotary cylinder.

Furthermore, the gun barrel (2) is equipped with an air compressor (not shown).
The compressed air from the air hose (9) passes through the nozzle (1).
01 and above are supplied continuously.

The above-mentioned reinforced concrete structure cutting device is substantially the same as the cutting device disclosed in the applicant's patent application filed on the same day (Title of invention: Structure cutting method and device). Bullets are being used instead.

Figures 6 to 13 show examples of the bullet (B);
Various shapes such as a cocoon shape as shown in Figures 8 and 7, a bullet shape as shown in Figures 8 and 9, a cylindrical shape as shown in Figures 10 and 11, and a sphere as shown in Figures 12 and 13. In order to make effective use of the explosive power of the explosive, it is necessary to layer explosive pieces (12+) with high specific gravity and strength, such as iron powder, with adhesive or the like (Figs. 6 and 8). 10 and 12], and is formed as a mixture α4 of explosives and explosive fragments (see FIGS. 7, 9, 11, and 13). ) is made of titanium to effectively utilize the energy and wavelength of the laser beam (L).

The surface is treated with a highly absorbent material such as silicon or graphite.

Since the illustrated embodiment is constructed as described above, the laser beam oscillation head r(1)A% and the laser beam (L)
The reinforced concrete structure (C) is oscillated to melt and cut the reinforced concrete structure (C), and at this time, the infrared rays generated from the molten material formed on the structure +C+ are detected by the two infrared detectors (3).
The axis of the gun barrel (21) is always aligned with the melt (g) by the direction control mechanism of the gun barrel based on this detection signal.

On the other hand, the bullet (B) from the bullet tank (4) is supplied into the bullet feed control device (6) via the bullet supply pipe (5), and is formed between adjacent partition pieces in the rotating cylinder. Insert one piece into the space.

On the other hand, the rotating barrel in the bullet feed control device (6) is rotated in a predetermined direction by a stepping motor (8), and when the space matches the gun barrel (21 and the supply pipe (5)), the rotating barrel momentarily rotates. Compressed air is injected from the through hole at the back of the space through a nozzle arranged at the back of the space, and the pressure of the compressed air causes the bullet to be discharged into the gun barrel (2).Meanwhile, the pipe Since an empty bullet accommodating space is located on the (5) side, one bullet (B) sinks into the empty space due to gravity and the vibration of the vibrator (7).

As mentioned above, the bullet (B) supplied to the gun barrel (2) is pushed through the gun barrel (2) by compressed air injected from the nozzle (10).
2) A laser beam (L) is emitted to the melted cutting groove in the structure +C+.

Thus, as shown in Fig. 1, the molten cutting groove of the reinforced concrete structure (C1 (bullet passing through D+) by the laser beam (L) collides with the molten material generated in the cutting groove (D), and the same Due to the energy exchange between the molten material surface, the scattered molten material σ and the bullet, and the molten material α, the bullet's surface is formed at the bottom of the cutting groove (D) as shown in Figure 2. Stop at the melting pot (E).

In FIG. 1, (I/) indicates the nine laser beams that were irradiated last time.

At the same time, the laser beam direction irradiates the bullet (B), so the bullet (B) absorbs the energy and explodes, opening along the cut groove (D) in the structure (C) as shown in Figure 3. The weak direction of the structure (C) is destroyed, and the broken pieces (beams) are scattered.Thus, a new exposed surface (box) appears in the cut groove (D) of the structure (C), and the outside of the same surface) is exposed to the laser beam. Since it is irradiated with (L), a melt (g) is generated again,
Thereafter, the same cycle as described above is repeated.

The infrared detector (3) accurately detects the depth of the molten material diagram, and when a predetermined cutting depth is reached, the process moves to the next cutting line and the same operation as described above is repeated to cut the structure (
Cut C1.

Note that the distance S from the previously irradiated laser beam (L') to the newly irradiated laser beam (Ll) is based on the structure (
The dimensions are set so that Ql is crushed and scattered just right.

In this way, according to the method of the embodiment, the laser beam (L)
The reinforced concrete structure (C) is bath melted by
) by exploding it with a laser beam (L), the structure (C) is cut and the cutting debris is removed. ) accurately and effectively.

The gas, scattered molten material, etc. generated by cutting by the laser beam (However) and the bullet (B) are transferred to the laser beam oscillation head (1) via the waste collection hose (14) connected to the suction treatment device (not shown). ) is attached to the tip of the collection hood (one piece) to inhale and capture the liquid.

Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to such embodiments, and can be modified in various ways without departing from the spirit of the invention. .

[Brief explanation of drawings]

1 to 3 are cross-sectional views of reinforced concrete structures according to the present invention, FIG. 4 is a view taken along arrows IV-IV in FIG. 1, and FIG. 5 is a cutting device for reinforced concrete structures used in the method of the present invention. FIGS. 6 to 13 are longitudinal side views showing the bullet valley embodiment, FIG. 12 is a view taken from the arrow in FIG. 6, and FIG. ■-■Figure. (B)...Bullet, (C1...Reinforced concrete structure, ■)...Cut groove, (E)...Melting pot,
('L)... Laser beam, (B)... Melt substance agent Patent attorney Shige Okamoto 2 people outside the text Figure 4 Figure 12 Figure 13 Bottle φ dark ・B8

Claims (4)

[Claims] (1) Immediately after melting the reinforced concrete structure to be cut with a laser beam, an explosive bullet formed into granules is poured into a melting pot of the structure, and the bullet is exploded by the energy of the laser beam to A method for cutting a reinforced concrete structure, characterized by locally crushing a small portion of the structure. (2) The method according to claim 1, wherein the bullet is formed into a rotating curved body having a smaller diameter than a melt pot formed in the reinforced concrete structure to be cut by a laser beam. (3) The bullet is formed by layering explosive pieces made of a material with high specific gravity and strength on the outer periphery of the explosive, or by mixing it with the explosive to increase the destructive force after explosion. The method described in Section 1. (4) The method according to claim 1, wherein the surface of the bullet is treated to have an appropriate absorption efficiency for laser beams.