JPS6035509B2 - Structure demolition method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for dismantling structures such as buildings, and is mainly applied to dismantling reinforced concrete or steel-framed reinforced concrete structures.

(Prior Art) Recently, there has been an increasing number of cases in which structures such as existing buildings need to be demolished for urban redevelopment or for rebuilding due to deterioration.

However, if the structure of a building is made of wood or steel, it is generally relatively easy to dismantle the structure, but if the structure is made of reinforced concrete or steel-framed reinforced concrete, it is not easy to dismantle the structure. In particular, in the case of steel-framed reinforced concrete, the structure is strong and strong, so it is extremely difficult to dismantle it.

However, the method generally used for dismantling sore structures at present is to use direct impact from steel balls or playing force. (Problems to be solved by the invention) The conventional demolition method carried out in this manner is inefficient, as it is not possible to estimate the number of construction days and construction costs because the demolition work does not have planning. There were many dangers involved, and the health of construction workers was often compromised.

Additionally, in recent years, there have been demolition methods using demolition equipment such as so-called power units, but these have not been used to demolish high-rise buildings.

There was a way to use force to demolish the top floor, use a bulldozer to collect the dismantled debris, and remove it with a chute, but the work of lowering the bulldozer to the next floor was done using a crane.
Therefore, it was necessary to frequently dispatch expensive crane trucks. (Purpose of the Invention) In view of the above-mentioned current situation, the present inventor has provided a rational, economical, safe and healthy method for dismantling structures that can dismantle structures in a planned and orderly manner.

(Example) The present invention will be explained in detail below based on embodiments shown in the drawings.

The drawing shows a four-story reinforced concrete or steel-frame reinforced concrete building as an example of a structure to be demolished. First, the crane 3 is placed on the roof slab 2 of the building 1.
to lift equipment used in demolition work. Equipment for this demolition includes a jacker 4 (for example, manufactured by Asahi Kasei Corporation, product name Asahi Jacker 160), which crushes and collapses floor slabs, beams, and supports of each layer, and surrounding green areas such as external walls and internal partitions. Cutting machine 5 (for example, Mitsubishi Heavy Industries, Ltd., Mitsubishi Mobara Krupp), chain
These include a front frock 6, a wire 7, a tripod 8, and a rock drill. Next, an assembled scaffold, a so-called bidi scaffold 9, is erected so as to surround the building 1 at a constant interval.

The bidi scaffolding 9 is of a type in which scaffolding steel pipes are assembled into a certain frame in a factory in advance and then assembled on site, and therefore can be erected around the building 1 extremely quickly. After the bidi scaffolding 9 is erected, a plurality of pipe scaffolds 10 are erected at appropriate intervals between the bidi scaffolding 9 and the building 1. One end of each pipe scaffold 10 penetrates through holes 12 drilled at appropriate intervals in the outer wall 11 using a rock drill or the like along the upper part of the floor slab of each layer, and the other end is hooked to the bidi scaffold 9. Scaffolding boards 13 are laid on top of the plurality of pipe scaffolds 10 constructed between the biddy scaffolding 9 and the building 1 in this way, so that construction workers can walk around on the scaffolding boards 13. To make it possible to catch debris trying to fly out of the demolition equipment 1 on the scaffold 13 during demolition. still,
A plate material 14 such as a plywood board is placed on the surface of the Pidi scaffold 9 erected around the building 1, and a sheet 16 is placed on the outside surface to prevent dust and noise from flowing outside the demolition site. I will try not to. After such preparatory work, the structure such as a building is demolished.

First, a through hole 17 is formed in a part of the rooftop floor slab 2, a tripod 8 is set up on top of this through hole 17, and the demolition equipment of the jacker 4 and cutting machine 5 is placed on the fourth floor using chain flocks 6, wires 7, etc. It is carried down onto the slab 18. Therefore, the jacking force of the jacker 4 is applied vertically or horizontally to lift the roof slab 2.
and destroy the beam 19.

In order to destroy the rooftop floor slab 2, jacking is performed from vertically below between the rooftop floor slab 2 and the floor slab 18 on the 4th floor. Therefore, the rooftop floor slab 2 can be easily destroyed by applying strong pressure from the bottom surface of the floor slab. The floor slab 18 on the fourth floor, which is under similar pressure from above, does not budge. Each beam 19 is similarly destroyed by vertically jacking it from below or horizontally jacking between the beams 19. Next, each outer wall 20 or internal partition is dismantled, and this is done by cutting the surrounding green part of each outer wall 20 using the cutting machine 5 and pulling it down inside.

After that, each column 21 is toppled and dismantled, but this is done by investigating the concrete strength of the column 21 and the location and strength of reinforcing bars and steel frames to calculate the yield bending moment strength of this column 21. Appropriate damage is applied to the outside of the pillar 21 with a rock drill or the like to reduce the yield bending moment strength in this part, and horizontal jacking is performed between the pillar 21 and the adjacent pillar 21 using the jacker 4. The columns 21 whose yield bending moment capacity has been reduced can be collapsed and dismantled very easily in the direction of the interior of the structure. In order to limit the direction of collapse of the pillar 21 to a predetermined position inside the structure, as shown in FIG. Bye. Incidentally, when cutting and destroying the dismantled object, if soapy water or the like is sprayed onto the dismantled object in a mist to generate foam, the dust generated by the cutting and breaking can be adsorbed. When the pillars 21 are successively collapsed and dismantled in this manner, the horizontal structure on the fourth floor is completely dismantled, and the debris generated by this dismantling is removed to lower floors or outdoors using an elevator chute or the like.

A through hole 22 similar to the through hole 17 provided in the rooftop floor slab 2 is provided in the floor slab 18 on the fourth floor, and a tripod, chain block, wire, etc. Demolition equipment such as No. 5 is carried down to the floor slab 23 on the third floor, and this third floor portion is dismantled in the same manner as the fourth floor portion described above. Also, the second floor and first floor floors will be dismantled in an orderly manner in the same manner as above. still,
The jacker 4, which serves as a demolition equipment used in the demolition method of the present invention, jacks with a hydraulic device equipped on a movable machine, and can jack in many directions.

In addition, the cutting machine 5 is attached to a hydraulic system equipped on a movable machine, so it does not have to be directly supported by the worker's hands to cut and destroy walls, etc., as in the case of conventional play force. White wax disease etc. does not occur due to this. Furthermore, soapy water or the like is sprayed onto the dismantled object to be cut from around the cutting edge of the cutting machine 5 to generate foam, and this foam adsorbs dust generated during cutting, thereby dispersing the dust into the air. Make sure it doesn't scatter. Therefore, workers no longer have to inhale dust and suffer health problems such as silicosis. (Effects of the Invention) The structure demolition method of the present invention has the following effects.

■ Since buildings can be dismantled in a planned manner, it is now possible to make design estimates for demolition. It was difficult to estimate this design using the conventional demolition method. ■ Less vibration and noise.

■ Buildings are surrounded by boards and sheets, so dust is not spread.

■ Multiple pipe scaffolds are erected on each layer between the building and the bidi scaffolding erected around the demolished building, and scaffolding boards are laid on top of the pipe scaffolding, so demolition workers can You can walk around freely on the slope and work, and the efficiency of demolition work is extremely high.

Conventional demolition methods did not use such scaffolding, and instead the building was destroyed haphazardly, but this scaffolding not only increased worker safety but also improved work efficiency. Additionally, it does not serve as a support for broken external walls on this floor, and objects falling from above can be blocked on that floor, greatly improving the safety of those working below. ■ Through holes are drilled at appropriate intervals in the exterior wall along the top surface of the floor slab on each floor, and one end of each pipe scaffold is inserted and latched into the through hole, so even if the exterior wall is dismantled, the pipe scaffold remains the same. Since the scaffolding is hung on the floor slab of the floor, the scaffolding will not break and work can be done safely.

Furthermore, each time the demolition work on each floor is completed, scaffolding will be placed at the same height as the slab beneath. Therefore, workers can be moved quickly and safely. Furthermore, when going to an undemolished area after partially dismantling it, you can use pipe scaffolding at the same height without having to move to the floor slab where reinforcing bars are protruding, holes are formed, or demolition equipment is layered. Since it can be moved upwards, it has become possible to move safely and quickly and perform demolition work. ■ In addition, demolition equipment is lowered onto the top floor slab through a hole provided in a part of the roof slab, and after dismantling the roof slab, beams, external walls, and columns with this demolition equipment, Since the work involved drilling holes in the slab on the floor and moving it to the floor below, all demolition work was limited to the same exterior walls and pillars that were located at least 1 mile away from where the demolition worker was located. Therefore, depending on the worker, it is easy to predict falling objects, and danger prevention can be ensured.

Moreover, all of the falling objects are below the height of the first floor, so the falling speed will never exceed a certain level, so it is enough to be careful about large parts, and even if you are hit by a piece of debris. There are no major accidents. Furthermore, since only the area above the worker's feet is to be demolished, and demolition does not begin until the demolition of the floor above the floor is complete, there is no risk of the worker falling down the hole, and It is excellent in terms of safety. Furthermore, since the demolition equipment is lowered from above by opening holes in the floor slab of the floor concerned, the machine for unloading the demolition equipment may be relatively lightweight, such as a chain block, wire, or tripod.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially sectional side view showing the state in which demolition equipment is transported onto a building, and FIG.
The figure shows the state in which the demolition equipment is carried down from the top floor to the topmost floor slab, Figure 3 is a plan view showing the state in which the columns are laid down, and Figure 4
FIG. 3 is a cross-sectional view of the slab. 1. ... Building, 2... Roof floor slab, 3.
...Crane, 4...Jatsuka, 5...
Cutting device, 17, 22...Through hole, 18...4
Floor slab, 19...beam, 20...outer wall, 21...column. Toru 3 general Raku female

Claims (1)

[Claims] 1. Hoist the demolition equipment onto the roof of the building to be demolished using a crane, then erect bidet scaffolding around the building at regular intervals, and place it on the outer wall along the top of the floor slab on each floor. Holes are drilled at appropriate intervals, one end of each pipe scaffold is hung on the bidet scaffold through the holes, and the scaffold board is placed on top of the multiple pipe scaffolds erected between the bidey scaffold and the building. After laying a board material such as a plywood board on the inner surface of the bidet scaffold and placing a sheet on the outer surface, a through hole is formed in a part of the roof slab, and a tripod is placed above the through hole. Using chain blocks, wires, etc., the demolition equipment is lowered through the hole onto the floor slab on the top floor, and this demolition equipment applies pressure to the rooftop floor slab and beams from below, dismantling them. The outer edges of the outer walls were cut, each of the cut outer walls was pulled down into the building and dismantled, and appropriate damage was applied to the outside of the base of each column to reduce the descending bending moment, and each of these columns was sequentially removed. After the building is demolished, the debris generated by the demolition is removed to lower floors or outdoors using an elevator chute, etc., and then removed to a part of the floor slab on the roof floor using the same method as above. A structure in which a building is demolished by passing through a hole, lowering demolition equipment through the hole to the floor slab on the next lower floor, and repeating the process of dismantling the floor slab, beams, exterior walls, etc. on the upper floor. How to disassemble the body.