JPH07100324B2 - Opening method of reinforced concrete wall - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention accurately forms an opening of a required size in a reinforced concrete wall body having a thickness of 1 m or less including a reinforced concrete dam body of a dam so as not to damage the surroundings. The present invention relates to a method of opening a reinforced concrete wall body for removing a sheet-shaped body that is installed and cut and separated.

[0002]

2. Description of the Related Art Conventionally, prior to crushing and removing an opening of a reinforced concrete wall, a slot is cut at a considerable depth along the circumference of the opening by a groove boring machine in order to cut the periphery of the opening. Abrading or forming a slot-shaped free surface,
It has been practiced to drill a hole in a block divided by a free surface, insert a hydraulic crusher into the block for excavation, and crush with an expansive crushing agent.

[0003]

However, in the above-mentioned conventional opening method, the cutter and the drill bit used therefor are drilled by giving impact and rotation, but the cutting edge derived from the material and shape of the drill bit. Is blunt and not only a large number of reinforcing bars cannot be cut, but also the cut surface is wavy, and an accurate and smooth opening cross section in the reinforced concrete wall is not formed.

An object of the present invention is to accurately pierce a reinforced concrete wall body having a thickness of 1 m or less with an opening of a required size so as not to cause an undesired damage to the surroundings, and to cut and separate the opening. An object of the present invention is to provide an opening construction method for a reinforced concrete wall body capable of removing a columnar body.

[0005]

A method for opening a reinforced concrete wall according to the present invention comprises a step of forming cable through holes in the thickness direction at each corner around an opening area in a reinforced concrete wall having a thickness of 1 m or less. , The cutting cable running through the guide pulley is wound around each adjacent cable through hole to endlessly hang on the cable driving pulley, and while the water is being poured, the cutting cable is driven to move backward by the cable driving device. The opening construction method of the reinforced concrete wall body includes a step of cutting the reinforced concrete wall body so as to be slightly tapered in the thickness direction and a step of removing the columnar body that has been cut and separated.

A diamond core bit used in construction work is suitable for the core drill for drilling holes to form cable through holes.

As the cutting cable, for example, a wire rope in which beads having a diamond abrasive grain layer and a spacer such as a coil spring are alternately inserted and fixed at predetermined intervals is used.

The cable drive device includes, for example, a cable drive pulley for running a wound cutting cable and a rotation drive mechanism for the cable, and a drive wheel for moving the rail or a rack by a drive pinion. What moves up may be used as appropriate.

[0009]

[Function] First, in the cable through hole step, the cable through hole is formed on the reinforced concrete wall body by using the core drill.
It is provided so as to penetrate. For example, when the opening area is a quadrangle, a total of four cable through holes are formed at each corner of the reinforced concrete wall body. In addition,
Since the opening area is not limited to a quadrangle, the cable through holes are formed according to the number of corners.

Next, in the step of cutting between adjacent cable through holes by wire sawing, all of the adjacent cable through holes in the reinforced concrete wall are
In other words, the entire circumference of the opening area is completely cut from the front surface side to the back surface side, and therefore the inner columnar body surrounded by each cut surface, that is, the columnar body having the opening area of a quadrangular prism or a rectangular parallelepiped is, of course, the periphery. Completely separated from the wall of
The edges are cut to form a cutting gap. With such wire sawing, the size of the opening does not matter as long as it can be circulated through the cutting cable.

When the cable driving device is operated during the above-mentioned wire sawing, the cutting cable circulates while being urged to the required tension, and the cutting cable is passed through so that the adjacent cables pass through. A break is made between them. The tension of the cutting cable can be maintained and adjusted as the wire sawing progresses, for example, by gradually moving the cable drive pulley rearward along the rail or rack, while fixing the cable drive pulley. Alternatively, another tension pulley may be gradually moved.

[0012] The cutting cable, as seen in rope conduction and belt conduction, can be bent freely through the guide pulley in the middle without being hindered from traveling, and can be arranged at a free length. Since it is possible, by arranging the guide pulley appropriately according to the positional relationship between the reinforced concrete wall and the cable drive device, obstacles in the middle, vertical cutting, horizontal cutting, inclined cutting, etc. It can be provided. After the cutting cable is once arranged between the reinforced concrete wall body and the cable drive device, the cutting work is performed by the cable drive device until it is completely cut including the internal reinforcing bar. Since it is controlled by, it is not necessary for the cutting worker to always engage in cutting work at the cutting site as in the past.
Easy to introduce automatic driving.

The running speed and tension of the cutting cable are appropriately selected depending on the cutting conditions of the reinforced concrete wall which is the object to be cut, but normally the running speed is 20 to 30 m.
/ Sec, the tension on the tension side is about 50 to 150 kg, and under these cutting conditions, the reinforced concrete wall body is completely cut including the internal reinforcing bars.

In the above-mentioned wire sawing, it is necessary to inject water into a cutting point or a cutting cable for cooling, lubrication, cleaning and the like. As the water injection method, for example,
Water is supplied into the hole from the water supply nozzle inserted at the end of the cable through hole, or water is supplied into the cable through hole.
Water may be discharged to the cutting point or the cutting cable from a water sprinkler arranged in the cable passage hole so as not to come into contact with the cutting cable. In that case,
When the reinforced concrete wall to be opened is partly or wholly underwater, such as a reinforced concrete dam body of a dam, the water around it can be used for water injection.

Finally, in the step of crushing and removing the columnar body that has been cut and separated, a concrete cutter and other equipment and devices are appropriately used together to crush the columnar body into a size that can be carried out, and the columnar body is sequentially discharged to the outside. After removing the columnar body, the opening is formed. In this step, the columnar body to be crushed in the previous step is completely cut and separated from the surrounding wall body in advance, the edge is cut, and the cutting gap is formed, so that the entire columnar body is not pulled out by pressing or pulling. It is possible. However, in this step of the present invention, in order to partially take out the crushed columnar body to the outside, it is possible to concurrently use partial withdrawal by pressing or pulling.

At this time, the entire columnar body can be easily extracted by wire sawing so that the reinforced concrete wall body is slightly tapered in the thickness direction, and is pressed or pulled.

[0017]

EXAMPLES Next, the invention will be specifically described based on examples. As shown in the front view and side view of FIG. 1A and FIG. 1B, respectively, a scaffold 2 is assembled on the downstream side of the reinforced concrete wall body 1, and cable corners 3a, 3b, 3c, and 3d is drilled.

The core drill is one in which diamond grains and a matrix as a binder are contained at the tip of the bit and sintered, and a drill body is attached to each corner of the opening to make a hole. When drilling, there is no vibration, the rebar and the steel frame can be cut, and the drilling can be performed at an accurate position.

Next, as shown in the side view and the plan view of FIGS. 2A and 2B, and the side view and the plan view of FIGS. 3A and 3B, respectively, a rail 4 is laid on the scaffold 2 and the rail 4 is provided. The cable driving device 5 is movably inserted in the cable. The cable drive device 5 includes a cable drive pulley 6 and a rotation drive mechanism (not shown), a tension side tension pulley 7 and a slack side tension pulley 8 adjacent to the cable drive pulley 6, and a drive which is further fitted to the rail 4. The wheel 9 and its rotation drive mechanism (not shown) are provided.

First, as shown in FIGS. 2A and 2B, the cutting cable 10 is passed through the cable through holes 3a and 3b so as to be wound around, and the tension side tension pulley 7 and the slack side tension pulley 7 in the cable drive device 5 are wound. Endlessly hangs on the cable drive pulley 6 through each inside of 8. When the cable drive pulley 6 and the drive wheels 9 of the cable drive device 5 are actuated in such a state, the cable drive pulley 6 moves rearward along the rail 4 while rotating, and therefore, for cutting. The cable 10 circulates endlessly with a required tension and vertically cuts between the cable through holes 3a and 3b in the reinforced concrete dam body 1. Then, the cable through holes 3c and 3d are also vertically cut in the same manner as described above.

Next, as shown in FIGS. 3A and 3B, the cutting cable 10 is inserted into the cable through holes 3b and 3c,
The cable is passed through the guide pulley base 11, and passed through the tension pulley 7 and the loose tension pulley 8 in the cable driving device 5 to be hung endlessly on the cable driving pulley 6. The guide pulley base 11 includes a pair of lateral guide pulleys 1.
2, 12 and two pairs of vertical guide pulleys 13a, 13a and 13b, 13b adjacent to them, respectively, which are anchored to the reinforced concrete wall 1 during wire sawing so as to be detachably anchored after use.

In such a state, by operating the cable driving device 5 in the same manner as above, the cutting cable 10 circulates endlessly with a required tension, and at the same time, the cable through hole 3b in the reinforced concrete wall 1. ，
Horizontal cutting is performed between 3c. Then, the cable through holes 3a and 3d are also horizontally cut in the same manner as described above. The guide pulley base 11 is provided with the cutting cable 10 passed between the cable through holes 3b, 3c or 3a, 3d.
Two pairs of vertical guide pulleys 1 that are adjacent to each other and are narrowed by a pair of lateral guide pulleys 12, 12.
It guides to the tension side tension pulley 7 and the loose side tension pulley 8 in the cable drive device 5 by 3a, 13a and 13b, 13b. At this time, by appropriately disposing the guide pulley, the reinforced concrete wall body can be cut obliquely so as to be slightly tapered in the thickness direction.

Although not shown, the cable through holes 3a, 3b, 3c, and
Water for cooling, lubrication, etc. is supplied to 3d and other cutting points if necessary.

Each cable through hole 3a, 3 as described above
By wire sawing between b, 3c and 3d, FIG.
And, as shown in the front view and the cross-sectional view of FIG. 4B, respectively, the columnar body 14 surrounded by the four cut surfaces is completely separated from the surrounding reinforced concrete dam body 1 and the edge is cut to form a cutting gap. It will be in a state of being.

Finally, the columnar bodies 14 are successively crushed and removed by a crusher or the like, and as shown in the sectional view of FIG.
5 is formed.

The invention is not limited to the embodiments described above. For example, the cutting order between the cable through holes may be appropriately selected according to the actual situation, and the above embodiment is merely an example. Further, the cable drive device may be moved in parallel or in an oblique direction with respect to the wall surface of the reinforced concrete wall body, and the cable drive device may be arranged on the reinforced concrete wall body or the like. It is also possible to employ another feed mechanism including a drive pinion and a rack or another tension maintaining mechanism. Further, as a guide pulley for freely guiding and changing the direction of the cutting cable, guide pulleys having a rotation surface in a required direction may not be integrated as described above, but may be separately used as many as a required number. A required number of guide pulley bases having guide pulleys in a combination different from the above may be installed and used on the reinforced concrete wall itself or on the road surface.

[0027]

According to this construction method, a reinforced concrete wall body having a thickness of 1 m or less is provided with an opening of a required size safely and accurately with a minimum man-hour so as not to cause an undesired damage to the surroundings. can do.

Further, since the cutting cable can be flexibly arranged in each adjacent cable through hole via the guide booley and has a free length, the reinforced concrete wall body and the cable drive device can be connected to each other. The guide pulleys can be freely arranged by appropriately arranging the guide pulleys according to the arrangement relationship, obstacles on the way, vertical cutting, horizontal cutting, inclined cutting and other cutting forms.

[Brief description of drawings]

FIG. 1A is a front view illustrating a step of forming a cable through hole in a method for opening a reinforced concrete wall according to the present invention.

FIG. 1B is a side view illustrating a step of forming a cable through hole in the method for opening a reinforced concrete wall according to the present invention.

FIG. 2A is a side view illustrating a wire sawing process.

FIG. 2B is a plan view illustrating a wire sawing process.

FIG. 3A is a side view illustrating a wire sawing process.

FIG. 4A is a front view illustrating a cut state after wire sawing.

FIG. 4B is a cross-sectional view taken along the line I-I of FIG. 4A for explaining a cut state after wire sawing.

5 is a cross-sectional view taken along the line II of FIG. 4A after the crushing step.

[Explanation of symbols]

 1 Reinforced concrete wall 3a, 3b, 3c, 3d Cable through hole 4 Rail 5 Cable drive device 10 Cutting cable 11 Guide pulley stand 14 Columnar body 15 Opening

Continuation of front page (56) References i1, GIORNALE dell'I NGEGENERE (1984-3-1) (I) P. 5 INDUSTRIAL DIAMOND REVIEW, 41 [483] (1981) (UK) De Beers Industrial Diamond Division Pty Limited. P. 81-82 INDUSTRIAL DIAMOND REVIEW, 43 [498] (1983) (UK) De Beers Industrial Diamond Division Pty Limited. P. 233

Claims (1)

[Claims] 1. A step of drilling a cable through hole at each corner around an opening area in a reinforced concrete wall having a thickness of 1 m or less in the thickness direction, and a cutting in which a cable pulley is run in each adjacent cable through hole. Endlessly hang the cable for use around the cable drive pulley, and while pouring water, drive the cable for cutting with the cable drive device to drive it backward and make it slightly taper in the thickness direction of the reinforced concrete wall. An opening method for a reinforced concrete wall body, which comprises a step of cutting and a step of removing the columnar body that has been cut and separated.