JPS62112866A - Cutting disassembling of 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 is applicable to buildings, bridges, foundations, large plants, subways,
Concerning methods for cutting and dismantling reinforced concrete structures such as nuclear power plants and pre-power plants.

[Conventional technology]

Conventional demolition methods for reinforced concrete structures include methods that utilize the expansion pressure of explosives and chemicals, gas pressure, and steel poles.

Methods of crushing using a vibrating hammer or hydraulic pressure, and methods of cutting using a disk-shaped blade or a water jet using water pressure are known.

[Problem that the invention seeks to solve]

However, the above-mentioned methods of destruction using explosives, etc., and methods of crushing using steel poles, etc., are both suitable for completely dismantling the target structure, and therefore can hardly be used for partial demolition of the structure. 9 These demolition methods cause blast, vibration, and impact on the surrounding environment!
! Due to the large impact of sound, noise, dust, etc., the location and conditions of use are severely restricted.

On the other hand, the method of cutting by rotating a disk-shaped blade is suitable for partial demolition of a structure, and is widely used for reinforcement, extension, or renovation of a structure as it ages. However, these blade-type cutting machines are smaller and lighter due to blade manufacturing and handling considerations, resulting in poor cutting ability, the cutting cross-sectional area is limited to a narrow range, and the thickness that can be cut is only 30 to 40 cm. The degree is maximum. In addition, in the case of partial cutting using the rotation of a disc-shaped blade, there are problems such as overcutting in areas where cutting is not required, and the blade-type cutting machine must be cut along a guide rail attached to the wall surface to be cut. The conventional construction method of moving and driving had problems with safety and workability.

Additionally, cutting methods using water jets that utilize water pressure can also be used for partial demolition of structures.
In addition, the cutting ability is extremely poor, large mechanical equipment is required, and the cutting surface spreads out in a radial manner. Regardless of the cutting cross-sectional area or cutting thickness of reinforcing steel, it can cut at an extremely high speed, with good workability and safety, and with minimal impact on the external environment such as vibration, noise, and dust. The purpose is to provide a demolition method that allows cutting and dismantling.

[Technical and defensive means to solve problems]

The method for cutting and dismantling a reinforced concrete structure according to the present invention involves driving a cutting cable, which is made by attaching ultra-hard beads to a wire at an appropriate pitch, while adjusting the running speed and tension, and cutting into the reinforced concrete structure. It is a feature.

In the above, the cutting cable is driven to run by a drive wheel that is rotationally driven by a hydraulic motor, electric motor, or other prime mover, and the cutting cable is arranged between the drive wheel and the reinforced concrete structure, and the cutting cable is Changing the running direction of the vehicle can be done freely by adjusting the angle of the rotating surface of the drive wheels or by installing a boob at each location. In addition, the running cutting cable is urged in the required direction so as to maintain the required tension at all times, and the tension is maintained or adjusted as the cutting and dismantling of the driving wheel, along with its attached equipment, progresses. This can be done by gradually moving it backwards.

Although the so-called wire saw has been known for a long time,
They were used exclusively for cutting stone in quarries, and the inventor.

It was discovered that innovative effects can be achieved by utilizing this method in a cutting and demolition method for reinforced concrete structures in a completely different industrial field, leading to the completion of the present invention.

The present invention will be explained in detail based on the drawings. FIG. 1 is a perspective view illustrating an example of the method for cutting and dismantling a reinforced concrete structure according to the present invention. Supports 2.2a are temporarily installed in an immovable state by anchors or the like (not shown), and a cylindrical rack 3 with a gear is attached to these supports 2.2a, which can rotate at an angle of 1xJfr1 around its axis. A self-propelled platform 4 is fitted into the rack 3 so as to be movable in the axial direction.

The self-propelled platform 4 includes a drive wheel rotation mechanism 6, which includes a drive wheel 5, a hydraulic motor for rotationally driving the drive wheel, a continuously variable transmission, and the like. In addition, a pinion rotation mechanism 8 is mounted, which includes a pinion 7 that meshes with the rack 3 and a hydraulic motor for rotationally driving the pinion. A hydraulic control box IO is connected via a hydraulic hose 9.

Furthermore, a cutting cable 11 is hung endlessly between the planned cutting start part on the surface of the reinforced concrete structure 1 and the drive wheel 5.

As illustrated in FIG. 2, which is an enlarged cross-sectional view, the cutting cable 11 is made of a steel wire 1 having a diameter of 5 mm.
2, outer diameter 10mff1 with diamond grain surface layer
．． Cylindrical beads 13 with a length of 10 m11 are 20 to 30 mm
Each adjacent cylindrical bead 13 is loosely fitted with a pitch.
A coil spring 14 is similarly fitted between the coil springs 13 and can be bent with a minimum diameter of 100+sm. Note that the beads 13 may be made of ultra-hard material that can cut concrete layers containing reinforcing bars, concrete blocks, bricks, etc., and may be made of ceramics other than diamond. A clip may be attached to each block consisting of an appropriate number of repeating beads 13 and coil springs 14 to restrict free movement between the blocks, and the coil spring 14 is bendable. However, depending on the case, it may be replaced with a cylindrical sleeve as long as the flexibility of the steel wire 12 is not inhibited, and only the beads 13 can be used as a spacer.
It may be fixed to 2 so as to be replaceable at a required pitch.

[Action of the invention]

In the above configuration, the cutting cable 11 is caused to circulate at a speed of, for example, 15 to 40 m/sec by the rotation of the drive wheel 5 caused by the operation of the drive wheel rotation mechanism 6, and at the same time, the cutting cable 11 is rotated by the pinion rotation mechanism. The rotational drive of the pinion 7 by the operation of the pinion 8 and the accompanying movement of the self-propelled platform 4 along the rack 3 constantly urges the rearward direction.
When pulled backwards with a tension of ~200 kg, the reinforced concrete structure 1, including the internal reinforcing bars, is completely cut and dismantled. In the case of the cutting and dismantling work described in -h, in the normal case, it is necessary to constantly pour water into the cut area for cooling, lubrication, cleaning, etc.

As described above, in the method of moving the self-propelled platform 4 along the rack 3, the self-propelled platform 4 may run out of control or break even immediately after cutting and dismantling the reinforced concrete structure l or when the cutting cable 11 suddenly breaks. It is safe because there is no risk of the cable 11 jumping.

Although the rotation surface of the drive wheel 50 is adjusted to be substantially horizontal in the above, the drive wheel 5 is adjusted to adjust the rotation angle around the axis of the rack 3 relative to the support 2.2a and to adjust the rotation angle of the drive wheel 5 around the axis of the rack 3 with respect to the support 2.2a.
For example, the rack 3 can be freely adjusted to the required height and in the required direction by 2 jgm for each height of 2a. When rotated and fixed to support 2.2a,
The rotating surface of the driving wheel 5 is vertical, and iAf! is located at a higher position than the support 2a (support 2a) in FIG. When H is reached, the rotating surface of the drive wheel 5 is tilted upward toward the reinforced concrete structure 1.

Furthermore, by arranging one or more pulleys at a required angle between the reinforced concrete structure 1 and the driving wheel 5, the angle of the cutting cable 11 to be wound around the driving wheel 5 can be adjusted or The cutting cable 11 can be freely bent and arranged at any length, and the cutting cable 11 can be freely hung at a desired position on the reinforced concrete structure l.
Furthermore, the relative arrangement between the reinforced concrete structure 1 and the driving wheels 5 can be freely selected.

Therefore, as described above, by adjusting the height and inclination angle of the drive wheel 5 as necessary, and arranging pulleys at various locations, the cutting cable 11 can be freely arranged and driven. Therefore, in addition to the above-mentioned horizontal cutting of reinforced concrete structures, it is possible to perform inclined cutting, vertical cutting, and other irregular cutting at a required height, regardless of the cutting thickness or the size of the cutting cross-sectional area. Cut 1
1i! Even when cutting and dismantling a reinforced concrete structure in a narrow space where it is difficult to transport the equipment, a dangerous high place such as the roof of a building, or a dangerous place along railroad tracks, the cutting cable 11 can be bent so that it can run. It is sufficient to set the Furthermore, after the cutting cable 11 is installed between the reinforced concrete structure l and the drive wheel 5, the demolition worker remotely operates the hydraulic control box lO at a location away from the cutting location or at a safe location. It can be operated and, in some cases, can be operated unmanned for long periods of time.

This method of cutting and dismantling reinforced concrete structures is useful not only for cutting and dismantling for disposal, but also for moving and preserving the upper body of bridge girders, public toilets, houses, monuments, machine foundations, columns, etc. by cutting the lower part. Useful.

[Example 1] Fig. 3 is a perspective view illustrating another example of the method for cutting and dismantling a reinforced concrete structure according to the present invention.
A pair of horizontal pulleys 15L, 15R and a pair of vertical pulleys 16
A pedestal (not shown) to which L and 16R are pivotally connected is temporarily installed, and a pedestal (not shown) to which a pair of vertical pulleys 17L and 17R are pivotally connected to the road surface 1 near the bottom of the reinforced concrete structure lot. ) is tentatively established.

Thus, the cutting cable 11 is hung around the upper part of the reinforced concrete structure 101 and the structure pulley 15
It passes through the inside of L and 15R, bends via vertical pulleys 16L and 16R, and further bends via vertical pulleys 17L and 17R, and is hung endlessly on the drive wheel 5, so that by its running drive, 42 parts of the reinforced concrete structure 101 are cut and dismantled approximately in the -1' direction. Note that the running drive means and tension adjustment means for the cutting cable 11 are the same as those shown in FIG. 1, so detailed explanations and illustrations will be omitted.

By sequentially repeating this cutting and dismantling method, it is possible to safely and reliably cut and dismantle the chimney-shaped reinforced concrete structure 101 from the top to the bottom. In addition, traditionally, chimney removal work involved setting up scaffolding all around the chimney.
Starting from the top, the pieces are cut sequentially by hand using a blade-type cutting machine.

A dismantling method in which a hydraulic crusher is attached to the tip of heavy machinery and the like is destroyed one by one is widely known, but it is not possible to do it by hand.

It is dangerous because the cutting speed is slow and the demolition worker must be close to the cutting site at all times, and when using a hydraulic crusher, there is a lot of noise and vibration, and reinforced concrete debris scatters and falls, so it is dangerous. This also posed a safety problem.

[Example 2] FIG. 4 is a perspective view illustrating another example of the method for cutting and dismantling a reinforced concrete structure according to the present invention. In the same figure, cut end holes P, Q, R, S are drilled, first the cut end holes P, Q
A cutting cable 11 is passed between them and hung endlessly around the drive wheel 5. Therefore, due to the traveling drive, the space between the cut end hole P and the cut end hole Q of the reinforced concrete structure 201 is completely cut, and there is no overcut as in the case of partial cutting due to the rotation of the disc-shaped blade. <Unnecessary. Subsequently, by similar operations, the height and inclination angle of the drive wheel 5 are adjusted as necessary, or cutting is performed via vertical, horizontal pulleys, inclined pulleys, and other various pulleys as shown in FIG. Between end holes Q and R, between cut end holes R and S,
By also cutting between the cut end holes S and P, a rectangular opening can be bored in the reinforced concrete structure 201.

In the case of such a cutting and demolition method, the cutting cable j l
Even cut end holes can be drilled through which M I++♀
(1st 12X 4x play 'sl' 111 Guten Hui Dou 1) Reinforced concrete structures 201 that are too thick to be cut can be easily cut and dismantled or opened.

Note that the running drive means and tension adjustment means for the cutting cable 11 are the same as those shown in FIG. 1, so detailed explanations and illustrations will be omitted.

〔Effect of the invention〕

As described above, in the method for cutting and dismantling a reinforced concrete structure according to the present invention, the cutting cable provided with ultra-hard beads is driven to cut and dismantle the reinforced concrete structure. - Force can be freely transmitted to the cutting cable like belt transmission or rope transmission, regardless of the length of the cutting cable or the manner in which it is bent.

Therefore, this cutting and demolition method involves cutting and demolition of various reinforced concrete structures in high and dangerous places such as chimneys and building roofs, dangerous places along railroad tracks, or in crowded areas or narrow spaces.

Or, when partially cutting and dismantling a reinforced concrete structure to selectively cut and dismantle only important parts of JTr without destroying other parts, there are limitations on the cutting cross-sectional area and cutting thickness, including internal reinforcing bars. Cutting and demolition can be performed at an extremely high cutting speed, with good workability, safely, and with minimal impact on the external environment such as vibration, noise, and dust.

Further, according to this cutting and demolition method, a polygonal opening can be bored in a reinforced concrete wall without overcutting.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating an example of the method for cutting and dismantling a reinforced concrete structure according to the present invention, FIG. 2 is an enlarged cross-sectional view of an example of a cutting cable, and FIG. 3 is a cutting and dismantling method for a reinforced concrete structure according to the present invention. A perspective view illustrating another example of the construction method. FIG. 4 is a perspective view illustrating another example of the method for cutting and dismantling a reinforced concrete structure according to the present invention. (Explanation of main symbols) 1.101,201...Reinforced concrete structure,
2.2a...Support, 3...Rank, 4.
... Self-propelled platform, 5... Drive wheel, 10... Hydraulic control box, 11... Cutting cable, 12.
...Steel wire, 13...Beads, 14.
...Coil spring patent applicant Daishichisha Co., Ltd. Agent Patent attorney Atsushi Ando Ittrap 3 diagram

Claims (1)

[Claims] 1. Reinforced concrete, characterized in that a cutting cable made of a wire with ultra-hard beads attached at an appropriate pitch is driven to run while adjusting the running speed and tension, and is cut into a reinforced concrete structure. A method for cutting and dismantling structures. 2. A method for cutting and dismantling a reinforced concrete structure as set forth in claim 1, which uses a cutting cable formed by alternately loosely fitting ultra-hard beads and coil springs into a steel wire. 3. The method for cutting and dismantling a reinforced concrete structure according to claim 1 or 2, wherein the ultra-hard beads have a surface layer of diamond grains.