JPS6263769A - Method for disassembling lining layer - 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 Field of Application] The present invention relates to a method applied to dismantling and removing aged lining layers and the like of the inner wall of a steel chimney.

[Conventional technology]

FIG. 8 is a partially cutaway cross-sectional view showing a conventional Firυ method for forming a lining layer on the inner wall of a chimney. When dismantling the lining layer 03 on the inner wall of the chimney 01, as shown in Figure 1, on a gondola 04 that can move up and down inside the chimney O1,
Execute sequentially starting from a part of the air breaker (or from the bottom).

The gondola 04 is raised and lowered through a rope 09 attached to the top of the chimney 01 via a pulley 082 and a winding drum OIO. To prevent the gondola 04 from swinging, fixing stays 05 are attached to both sides of the gondola 04.

[Problem that the invention seeks to solve]

However, the conventional method of dismantling the lining layer has the following problems.

Noise pollution: In the case of steel chimneys constructed using impact methods such as air breakers and picks and hammers, 80 steps could not be performed.

Safety and health regulations: The usage time of impact vibrating tools is restricted to no more than 2 hours a day, and no more than 20 minutes of continuous work at a time (as per the Labor Standards Inspection Office), in order to prevent diseases such as white wax and hearing loss. .

Increasing construction time and costs: Due to residents' demands for shorter work times due to noise regulations and health and safety regulations, it is essential to secure a large number of workers, so an increase in construction time and costs can be avoided. There wasn't.

[Failure to solve the problem]

At a predetermined position in the lining layer to be dismantled, use a core bit (a type of drill) with a circular hole of a predetermined diameter attached to the tip of a rotary holder to insert a crushing tool that will increase the size of the chimney barrel into the hole. The lining layer was crushed by applying rotation or static pressure.

Since the core bit is rotary, noise is drastically reduced, and the crushing tool inserted into the hole is easy to use.

As the crack expands inside the hole, the lining material, which has low elongation and is vulnerable to tension, propagates radially from the center of the hole, propagates to surrounding holes, and fractures the lining layer.

Incidentally, since the diameter of the crushing tool inserted into the hole is increased by one rotation or static pressure, the noise is also drastically reduced.

Although the crushing takes place in holes drilled at predetermined intervals, the bonding force between the two steel plates and the lining material surface is extremely small, so if the cracks between adjacent holes connect, the separation of the steel plate and lining layer at the interface will spread over a wide area. .

Therefore, the entire surface can be crushed by partially crushing the lining layer.

〔Example〕

FIGS. 1 to 7 are explanatory views showing two embodiments of the present invention. As shown in FIG. 1, the core bit 4 is attached to an electric or air-driven rotating machine (not shown) toward the lining layer 2.

A circular hole 5 with a predetermined diameter do is made up to one side of the steel plate. In addition.

3 in the figure is a reinforcing bar, 3-1 is a welding stud, and 3.

Next, as shown in FIGS. 2 and 3, a retaining spring 6- is attached to prevent separation of the diameter-expanding fracture portion 6-1, which is divided in the circumferential direction.
2 (minimum diameter d1 is less than d, maximum diameter is greater than do) is inserted into the circular hole 5 as shown in FIG. is pressed statically by hydraulic pressure or a screw-type advancing/retracting mechanism (not shown).

Expand the diameter. Therefore, as shown in FIG. 5, by expanding the diameter of the crushing tool 6, the lining layer 2, which is vulnerable to tensile loads, is
Radial cracks 7 are generated starting from the circular hole 5. Therefore,
By setting the holes and grooves of each circular hole 5 at predetermined intervals, these cracks 7 are connected, so by breaking the reinforcing bars 3 at key points or tensile bending the exposed reinforcing bars 3, the lining layer 2 can be peeled off. be done.

As another example of the crushing tool, as shown in FIG. 6, a planer type crushing tool (a conical type is also possible) 8 may be used, in which the radius of the tool in contact with the circular hole 5 is increased by compression. Furthermore, as shown in FIG.
A crushing tool 9 may be used in which the interlocking pawl 9-3 fitted into the groove of the spiral grooved turntable 9-2 radially increases in radius by rotating -1 in the direction of the arrow.

〔Effect of the invention〕

The above-mentioned method of the present invention produces the following effects. By changing the conventional impact crushing method to a "rotating, static pressure crushing" method, the noise at the noise source can be reduced to 30 horns or less outside the chimney. Therefore, noise pollution can be prevented.

It enables continuous crushing work without being subject to safety and health regulations, eliminates the need for replacement tools, shortens construction time, and reduces welding costs.

Since drilling and crushing are performed at predetermined intervals, the work is done locally and intermittently, resulting in high crushing efficiency and easy negative impact on workers, etc.2.
The present invention greatly contributes to industrial development.

[Brief explanation of drawings]

Figures 1 to 7 are explanatory diagrams showing examples of the method of the present invention, and Figure 1 is a perspective view showing a partial cross section immediately after drilling a hole by the rotation method on the lining layer in the method of the present invention. , Fig. 2 is a bird's-eye view showing an example of a crushing tool, Fig. 3
The figure is a view taken along the arrow III-I in Figure 2, and Figure 4 is a view after inserting the diameter-expanding crushing tool into the circular hole in the lining layer and suppressing the tapered bottle (
Figure 5 is a cross-sectional view showing the situation immediately before fracture of the lining layer under static pressure (static pressure caused by hydraulic pressure, etc.), Figure 5 is a view taken along the V-■ arrow in Figure 4 showing the situation where cracks have propagated from the circular hole, and Figure 6 is A cross-sectional view showing another example of static pressure insertion and crushing of a plane-type crushing tool as a diameter-expanding crushing tool. FIG. 7 shows a crushing tool in which interlocking claws expand and contract in the hole diameter direction as the diameter-expanding crushing tool rotates. FIG. FIG. 8 is a partially cutaway cross-sectional view showing a conventional method for forming a lining layer on the inner wall of a chimney. (3-1... Welding stud, 3-2. Lateral reinforcement, 3-3.
・Vertical stripes), 4... Core bit (・1-1... Blade, 4
-2...Body, 4-3...Center bin, -1
-4...Shank), 5...Circular hole, 6...Diameter expansion type crushing tool (6-1...Diameter expansion crushing part, 6-2...Holding spring. 6-3... press tapered bottle), 7... crack, 8...
... Planer type crushing tool, 9... crushing tool. V] Figure 4 Figure 8

Claims (1)

[Claims] Circular holes are bored at a predetermined pitch in a lining layer such as cement that is vulnerable to tensile loads, a crushing tool that expands in the radial direction of the circular hole is inserted into the circular hole, and the above-mentioned A method for dismantling a lining layer, comprising crushing the lining portion by enlarging a tool diameter.