JPH0567757B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for cutting and dismantling cylindrical structures made of concrete, such as hazardous materials storage facilities, super-tall chimneys, or bridge piers. be.

[Technical background and prior art] For example, when dismantling a very high chimney, or dismantling and re-forming a bridge pier, it is desirable to minimize the scattering of demolition debris and dust generated during the work, as well as the noise. In hazardous materials storage facilities that store hazardous materials such as hazardous materials, prevention of scattering of demolition debris and dust contaminated with hazardous materials and remote control of operations are particularly important issues. In general, methods such as pneumatic rock drills and hydraulic crushers are used to dismantle concrete structures, but with either method, it is difficult to prevent the noise caused by the scattering of cut pieces and dust. Furthermore, it is difficult to apply it to narrow spaces.

A technique for cutting a cylindrical structure from the inside is disclosed in Japanese Patent Laid-Open No. 18858/1983. However, in this known technique, it is necessary to provide a working passage or the like at the bottom of the structure in order to carry out the fallen blocks, and even then, it is difficult to carry out the work of extracting the blocks.

Further, a cutting technique using an abrasive jet is also known and is disclosed in, for example, Japanese Patent Laid-Open No. 60-238572. However, there is no mention of transporting the cut blocks.

Furthermore, JP-A-55-101671 discloses a technique for dismantling a cylindrical structure, but since the cylindrical structure is crushed by being sandwiched between hydraulic crushers, it is not necessary to cut the inner wall. Can not.

[Problems to be Solved] Therefore, an object of the present invention is to provide a method for cutting and dismantling a cylindrical structure, which allows the cylindrical structure to be easily cut and the cut blocks to be easily transported.

[Means for Solving the Problems] According to the present invention, in a method for cutting and dismantling a cylindrical structure in which the cylindrical structure is cut into blocks by injecting an abrasive jet from the inside thereof, the structure to be dismantled is A block diagram is created in which the object and the inner wall are divided at a certain angle in the radial direction and into rings with a predetermined dimension in the axial direction.
A support and lifting device is installed on the top of the structure, and a cutting and demolition device equipped with an abrasive eject nozzle is suspended by a wire using a number of winches installed on the support and lifting device. Hanging the block carrying out device, according to the block diagram, cut out the inside of the structure block by block from the bottom to the top using an abrasive jet, and drop the separated blocks onto the block carrying out device by their own weight, At the same time, the cut slurry containing the abrasive material is collected and reused in a slurry collection pan provided at the lower end, and the block delivery device is moved upward to transport the collected blocks.

[Description of Functions and Effects] Therefore, the cutting and dismantling device is suspended below the cylindrical structure to be cut, and the cutting work is performed according to a predetermined block diagram. As a result, the cut blocks fall downward and are collected by the block unloading device. In this way, when the block carrying-out device is full of cut blocks, the block carrying-out device is lifted together with the cutting and dismantling device, and the blocks are transported from above to another carrying-out device, for example, by a conveyor, to a predetermined location. Then repeat the above creation.

Furthermore, the cut slurry containing the abrasive material is collected in a slurry collection pan and reused, so there is no waste.

According to the present invention, the approximate size of the block can be determined through block diagramming, and therefore the impact force due to the drop due to its own weight can be calculated, so that the block carrying out device can be designed with sufficient safety.

Since the block is lifted upwards, the block can be carried out reliably without soiling the lower part.
In addition, falling abrasives can be collected by the block unloading device.

Moreover, there is no need to install guide jigs as in the known technology, and automatic control is performed by a computer.
This allows for efficient cutting and dismantling work, and is also preferable from a safety standpoint.

[Example] The present invention will be described below with reference to the drawings.

FIG. 1 shows a case where the cutting and demolition method of the present invention is applied to, for example, a concrete structure of a hazardous materials storage facility, where a contaminated area 1 inside a concrete structure 2 is cut and dismantled using the method of the present invention. It is something.

The concrete structure 2 has a complex external shape, and the internal cavity 3 is also formed in a complex shape to accommodate a storage container. In this embodiment, the inside of the concrete structure after the storage container has been removed is removed by cutting it into a cylindrical shape.

When implementing the cutting and demolition method, the construction order is first determined according to the shape of the structure, but in this embodiment, the entire area and area 1 are divided into sections A, B, and C. Then, the cutting process of the cutting block is determined according to the size and shape of each section. Next, each section is further subdivided into blocks,
Create a cutting process diagram.

Figure 2 is a longitudinal cross-section of the block cutting process. Section A is made into one layer, Section B is made into two layers because of its large thickness, and Section C is made into one layer except for a part. There is. The horizontal cross-sections of A and B sections are as shown in Figures 3 and 4, and in A section, block A1 is rotated every 20 degrees.
It is divided into 18 parts, and in the B section, the inner block B1
is divided into 15 parts every 24 degrees of rotation angle, and the outer block B2
is divided into 18 parts every 20 degrees of rotation angle. The block C1 of the C section has the same dimensions as the block A1, and the lower taper portion is divided into appropriate shapes.

Next, the cutting means applied to the present invention will be explained.

The cutting method for this type of concrete structure requires remote control in order to avoid contamination, and also requires measures to prevent the generated dust from scattering. For this purpose, controlled explosion methods using explosives, mechanical cutting methods using diamond cutters and core boring machines, thermal cutting methods that melt concrete with high-temperature gas, and abrasive jetting methods that use high-pressure water containing abrasives are used. Although various cutting methods have been developed, this embodiment employs an abrasive jet cutting method.

The device used in this abrasive jet cutting method is as shown in FIG. 5, with a water nozzle 20 connected to a high pressure water pump having a
A mixing chamber 21 is installed. An abrasive material 23 is supplied to the mixing chamber 21, and an appropriate material such as sand or cast steel is used as the abrasive material 23. The high-pressure water mixed with the abrasive material in the mixing chamber 21 is injected as a jet stream from the abrasive nozzle 22 at the tip, and easily cuts even reinforced concrete.

The overall configuration of the cutting and demolition equipment equipped with this abrasive jet nozzle is as shown in FIG. ,
The cylindrical inner wall is cut and dismantled from the inner space 3 side.

Since a crane 6 is installed inside the container 5, the support and lifting device 8 is installed using this.
A large number of winches are attached to this support and lifting device 8, and a wire 7 connects the cutting machine holding drive device 10 and the block unloading device 11 to the space 3.
The cutting and dismantling work is carried out by suspending the machine inside the machine.

A pump room 13 is provided adjacent to the hazardous materials storage building 5, and an ultra-high pressure pump 14 is installed therein. The ultra-high pressure generated by this device is supplied to the nozzle section of the cutting device 10 via piping, and abrasive material is supplied from the abrasive supply device 15 to the nozzle section via a hose to cut the block in the manner described later. .

The slurry containing the abrasive material used for cutting is collected by falling into a slurry recovery pan 12 provided at the lower end of the space 3, recycled, and can be used again for cutting. The blocks separated by the cutting device fall onto the block carrying-out device 11, and are carried out above the structure in a manner to be described later. These series of operations are remotely controlled by commands from a control panel 17 provided in the central operator's cab 16. Next, the cutting and unloading steps of the present invention will be explained with reference to FIGS. 7 and 8.

As shown in detail in FIG. 7, in the present invention, the cut blocks are dropped downward and received by the unloading device, so the device is also arranged in a manner suitable for this process. i.e. support,
The lifting device 8 includes winches 8a and 8b, and a wire 7a of the winch 8a suspends a cutting machine holding and driving device 10 within the space 3. This device 10 has extendable fixed legs 26, and the entire device is positioned against the inner wall of the structure, and the abrasive jet nozzle 22 is operated to cut out blocks B1 and the like.

Winch 8b provided on support and lifting device 8
is connected to the block unloading device 11 via the wire 7b.
is hanging. This block unloading device 11 is
It is equipped with a swash plate 32 for receiving the separated blocks, a rod 31 for operating the swash plate 32, and a pan 30 for collecting the blocks. Further, the entire unloading device is positioned and fixed by telescopic legs 33.

Next, the process of cutting and transporting blocks for each area using this device will be explained.

FIG. 8 shows the positions of the main blocks, their shapes and dimensions, and the cutting and unloading process starts from cutting out block B1 inside area B. The size of this block B1 is such that it can be transported, and is appropriately selected depending on the ease of handling and the size of the container in which it is housed. Following block B1, area A and area C are cut and carried out. The basic dimensions of blocks A1 and C1 in areas A and C are the same as block B1. Finally, blocks B2 outside area B are sequentially cut and transported from the bottom of the area upward.

In addition, when a suitable number of blocks are collected in the pan 30 of the carrying out device during this cutting of blocks, the winches 8a and 8b of the supporting and lifting device are operated to support the entire carrying out device 11 together with the cutting device 10. Hoist it up to the inside of the frame of the lifting device 8. In this state, the entire supporting and lifting device is moved to the side and the block is collected into a container or the like.

[Effects of the Invention] As described above, according to the present invention, the following excellent effects are achieved.

(i) Since the cut blocks fall under their own weight and are collected by the block unloading device, it is easy to collect the blocks.

(ii) Since the block is diagrammed and cut, the size and dimensions of the cut block are almost constant, and the impact force applied to the block conveying device when it falls is also almost constant, making the overall design easy.

(iii) The cut blocks and abrasives can be transported upwards, the lower part will not get dirty, and the transport work can be carried out easily.

(iv) It is easy to automate using a computer and has excellent workability and safety.

(v) There is no waste because the slurry can be collected and reused.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a cylindrical structure to be cut and disassembled by applying the present invention, Fig. 2 is a longitudinal cross-sectional view showing a block diagram of the cutting and dismantling part, and Fig. 3 is A of Fig. 2.
-A sectional view, FIG. 4 is a BB sectional view in FIG. 2, FIG. 5 is an explanatory diagram of a nozzle used for abrasive jet cutting, and FIG. FIG. 7 is a detailed view of the cutting and unloading device, and FIG. 8 is an explanatory view of the manner in which blocks are cut and unloaded. 2... Concrete structure, 3... Internal cavity,
5... Hazardous materials storage building, 7... Wire, 8...
Lifting device, 10...Cutting device, 11...Block unloading device, 12...Slurry collection pan, 13...
Pump room, 16... Central operator's room, 22... Abrasive jet nozzle, A1, B1, B2, C1
...Cutting block.

Claims (1)

[Claims] 1 In a method for cutting and disassembling a cylindrical structure in which a cylindrical structure is cut into blocks by injecting an abrasive jet from the inside, the inner wall of the structure to be dismantled is divided into radial directions at fixed angles in advance. Then, a block diagram is created in which the structure is divided into rings with predetermined dimensions in the axial direction, and a support and lifting device is installed on the top of the structure, and abrasive jet nozzles are installed using wires using a large number of winches installed on the support and lifting device. A cutting and dismantling device equipped with the structure is hung, and a block carrying device is hung below the cutting and disassembling device, and according to the block diagram, the inside of the structure is cut block by block from the bottom to the top using an abrasive jet. the separated block is dropped into the block carrying out device by its own weight,
At the same time, the cut slurry containing the abrasive material is collected and reused by a slurry collection pan provided at the lower end, and the block delivery device is moved upward to transport the collected blocks. How to cut and dismantle structures.