JPH0443543B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for dismantling a reinforced concrete chimney that is not scheduled to be put into operation.

[Conventional technology and its issues]

Dismantling such long chimneys made of reinforced concrete requires work at heights of 100 meters or more in some cases, so safety is particularly important.

Conventionally, for example, there is a construction method in which a full frame scaffold is installed around the entire outer circumference of the chimney, and the scaffolding is manually demolished from the outer circumference, but this method is inefficient and takes a long time to complete. Replacing this scaffolding with a climbing-type mobile scaffolding would improve safety somewhat, but it would not improve work efficiency.

There is also a destruction method using a static pressure hydraulic crusher that grips the chimney wall from the upper end, but with this static pressure hydraulic crusher, the cutting edge of the crusher hits the reinforcing bars, especially when there are many reinforcing bars. It cannot be pushed through and the crushing ability decreases.

On the other hand, there is a demolition method disclosed in Japanese Patent Application Laid-Open No. 144132/1983 that destroys the chimney from inside.This method uses a device with a hammer head attached to the tip of a hydraulic cylinder, and the Due to the cylinder extension action, the hammer head comes into contact with the inner wall of the chimney, and its pressing force destroys the chimney from the inner wall to the outer wall.

However, the one disclosed in JP-A No. 52-144132 is of a static pressure type like the above-mentioned static pressure type hydraulic crusher, and the hammer head that comes into contact with the inner wall of the chimney is pressed by the pressure of the hydraulic jack. For example, even if the hammerhead is equipped with a blade, there is a risk that the cutting edge of the hammerhead will pierce the reinforcing steel, making it difficult to cut, especially in chimneys with many reinforcing bars. It is. Therefore, the crushing ability is reduced, and reliable disassembly by crushing cannot be performed.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a chimney demolition device which has high demolition efficiency and can safely and reliably crush wall concrete.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention installs a pressure-receiving material through a first bracket to the rear end of an inner cylinder whose distal end is slidably inserted into an outer cylinder so that its rear end protrudes. a rod end of a hydraulic cylinder is connected to the rod end of the hydraulic cylinder, and the other end of the hydraulic cylinder is pin-coupled to a second bracket attached to the side of the outer cylinder to form a horizontal frame that is entirely extendable and retractable by the hydraulic cylinder; The gist is that a hanging piece of crane wire is protruded from the upper surface of the outer cylinder of this horizontal frame, and a breaker with a chisel is attached to the tip of this outer cylinder via a support bracket with two-point support by pin connection. It is something.

[Effect]

According to the present invention, the horizontal frame, which is expandable and retractable using a hydraulic cylinder, maintains a horizontal position inside the chimney, and the pressure receiving material protrudes from the rear end to press the chisel at the tip. Additionally, when the breaker is activated, the chisel that comes into contact with the inside of the chimney vibrates, making it possible to make a hole in the chimney in front of it. By performing such intermittent crushing at appropriate intervals in the circumferential direction, crushing at the same level is completed.

〔Example〕

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

First, the crusher 1 used in the construction method of the present invention will be described. As shown in FIG. 1, the pressure-receiving material 4 is attached to the rear end of the inner cylinder 3, the tip of which is slidably inserted into the outer cylinder 2, via a first bracket 4a so that the rear end protrudes. A rod 5a of a hydraulic cylinder 5 is connected to this pressure receiving material 4, and the hydraulic cylinder 5
The other end was pin-coupled to a second bracket 6 attached to the side of the outer cylinder 2 to form a horizontal frame 7 that could be expanded and contracted as a whole by the hydraulic cylinder 5.

Hanging pieces 8 and 8' of crane wire are protruded from the upper surface of the outer cylinder 2 of the horizontal frame 7, and a breaker 10 having a chisel 10a is connected to the tip of the outer cylinder 2 via a support bracket 9 with a pin connection. Install with two-point support.

On the other hand, as shown in FIG. 2, a tower crane 12 and a cargo elevator 13 were installed along the side of the reinforced concrete chimney 11 to be demolished, and a ring-type suspended scaffold 14 was set at the top end of the chimney 11. In the figure, reference numeral 15 indicates a framework scaffold assembled around the lower outer periphery of the chimney 11.

While the crusher 1 is suspended horizontally by the hook of a tower crane 12 using a hanging wire 16, the crusher 1 is suspended into the upper end opening of the chimney 11 with its frame 7 tightened. Next, by operating the hydraulic cylinder 5 and sliding the outer cylinder 2 and the inner cylinder 3 relative to each other to slightly extend the frame 7, the chisel 10a is attached to the tip of the pressure receiving material 4 and the breaker 10, as shown in FIG. The crusher 1 comes into contact with the inner surface of the wall of the chimney 11 and is fixed in a suspended state within the chimney 11.

In this way, the breaker 10 is activated to vibrate the chisel 10a, and the chisel 10a makes a hole in front of the chisel 10a to perform crushing.

Then, by crushing at appropriate intervals of 360 degrees in the circumferential direction at the same horizontal level, cutting can be achieved at the same horizontal level. Thereafter, the horizontal frame 7 is retracted, the suspension position of the crusher 1 is lowered one step, and crushing in the circumferential direction is performed again. By repeating this operation, it is possible to separate and sequentially dismantle each piece of debris at the same horizontal level.

Figure 4 is a flowchart showing the procedure for dismantling work on the link-type suspended scaffold 14. If the concrete of the wall of the chimney 11 of the required length in the vertical direction is crushed from the inside (step-pui) in this way, it is possible to After the suspended scaffold 14 is lowered, the unnecessary parts of the mast of the tower crane 12 and the mast of the elevator 13 that remain above it are sequentially removed (step d).

The above steps from step 1 to step 2 are frame scaffolding 15
The steps are repeated sequentially in cycles of 1.0 m until a certain height is reached, and then the link-type suspended scaffolding 14 is dismantled and removed, and the cargo elevator 13 is removed.

Although not shown in the drawings, the link type suspended scaffolding 14 has a triple structure with a suspension beam with a hydraulic jack, a horizontal pressure jack, and a lever block as a safety mechanism.
Moreover, it has a two-tiered structure, upper and lower, to prevent crushed debris from falling.

〔Effect of the invention〕

As described above, the chimney demolition device of the present invention is capable of destroying the chimney wall from the inside by descending into the chimney in sequence, and is highly efficient and highly safe. It is something.

Moreover, the crusher is constructed by incorporating a breaker,
Since the crushing work is carried out by vibration crushing with a chisel, it can crush effectively even when there are many reinforcing bars compared to the pressure crushing of a static pressure crusher.

[Brief explanation of drawings]

Fig. 1 is a side view of the disassembling device of the present invention, Fig. 2 is an explanatory view of the same as above, Fig. 3 is a front view showing the state of use of the disassembling device of the present invention, and Fig. 4 is a working process of the disassembling device of the present invention. This is a flowchart showing the following. 1... Crusher, 2... Outer cylinder, 3... Inner cylinder, 4... Pressure receiving material, 4a... Bracket, 5... Hydraulic cylinder, 5a
...rod, 6...bracket, 7...horizontal frame,
8, 8'... Hanging piece, 9... Support bracket, 10
...Breaker, 10a...Chisel, 11...Chimney, 12
...Tower crane, 13...Personnel elevator, 14
...Ring type suspended scaffold, 15...Frame scaffold, 16...Suspended wire.

Claims (1)

[Claims] 1. Attach the pressure receiving material via the first bracket to the rear end of the inner cylinder whose tip is slidably inserted into the outer cylinder so that the rear end protrudes, and connect the rod end of the hydraulic cylinder to the pressure receiving material. , and the other end of the hydraulic cylinder is pin-coupled to a second bracket attached to the side of the outer cylinder to form a horizontal frame that is entirely extendable and retractable with the hydraulic cylinder, and a horizontal frame is attached to the upper surface of the outer cylinder of the horizontal frame. A chimney dismantling device characterized in that a hanging piece of crane wire is provided protrudingly, and a breaker having a chisel is attached to the tip of the outer cylinder via a support bracket with two-point support by pin connection.