JP2007152795A - Apparatus for cutting with wire saw, method for cutting structural body and method for scraping ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for cutting capable of smoothly cutting or scraping without slip between a driving pulley and a wire saw, and capable of enlarging a cutting width by decreasing the amount of wire saw's sag. <P>SOLUTION: The apparatus comprises a plurality of pulley supporters 1, 1 extending parallel each other with a distance, front pulleys 7, 7 axially supported by the tips of the pulley supporters 1, 1, a rear pulley 12 axially supported backward apart from the front pulley 7 by at least one pulley supporter 7, a wire saw 13 wound endlessly around each pulley 7, 12, a tension applying means for applying a tension to the wire saw 13, and a driving motor circularly running the wire saw 13 wherein the wire saw 13 is wound by a plurality of stages between two adjacent pulleys 7, 7 and a driving motor is connected for driving to at least one of the two adjacent pulleys 7, 7 around which the wire saw is wound by a plurality of stages. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wire saw cutting device, and further to a method of cutting a structure such as a concrete structure or cutting a ground into a groove shape using the cutting device.

  As a method of cutting various concrete structures such as columns, walls, and piers, a cutting method using an endless wire saw in which a number of carbide tips such as diamond are attached to a wire is known. This method cuts a concrete structure by winding a wire saw around a concrete structure in a U-shape and drawing it in one direction while circulating through a drive device having a relatively large diameter drive pulley.

  A method of cutting the ground with a wire saw has also been proposed (see, for example, Patent Document 1). In this technique, an apparatus including a pair of pulley supports on which a plurality of pulleys are supported and an endless wire saw wound around each pulley is used. Then, a pair of guide tubes are installed at an interval in the ground, and the wire saw is circulated while inserting a pulley support into these guide tubes, thereby cutting the ground into a groove shape.

  In the device disclosed in this prior art document, a pulley group including a wire saw and a drive pulley that circulates the wire saw is attached to a support body, so that the entire device is compact and the wire saw is short. Therefore, there is an advantage that the loss of driving energy is small.

However, on the other hand, the drive pulley must be inserted into the guide tube, and a small diameter drive pulley must be used. Moreover, since each pulley including the drive pulley is attached to each vertex position so that the wire saw forms a substantially right triangle (or quadrilateral) as a whole, the winding angle with respect to the drive pulley is reduced, and the drive pulley and the wire saw are The frictional force between them cannot be increased. For this reason, slip is likely to occur between the drive pulley and the wire saw, and the ground may not be cut smoothly. Further, since the amount of slack of the wire saw is large, the distance between the pulley supports, that is, the dimension between the pulley support shafts cannot be increased, and the cutting width cannot be increased.
JP-A-6-264448

The present invention has been made based on the technical background as described above, and achieves the following object.
The object of the present invention is to smoothly perform cutting or cutting work without causing slip between the drive pulley and the wire saw when the object is cut or cut by circulating the wire saw. Another object of the present invention is to provide a cutting device, a structure cutting method, and a ground cutting method capable of increasing the cutting width by reducing the amount of slack in the wire saw.

The present invention employs the following means in order to achieve the above object.
That is, the present invention comprises a pair of pulley supports extending in parallel and spaced from each other;
A pair of front pulleys each pivotally supported at the tip of these pulley supports;
A rear pulley that is pivotally supported on at least one pulley support so as to be spaced rearward from the front pulley;
A wire saw wound endlessly on each pulley;
Tension applying means for applying tension to the wire saw;
A drive motor for circulating the wire saw,
The wire saw is wound in multiple stages between two pulleys adjacent to each other,
In the wire saw cutting apparatus, the drive motor is drivingly connected to at least one of the two pulleys wound around the plurality of stages.

  In the cutting apparatus, for example, the wire saw may be wound around a plurality of stages between the pair of front pulleys. The tension applying means can be constituted by means for supporting the rear pulley movably in the length direction on the pulley support and a biasing member for biasing the rear pulley rearward. In addition, a configuration in which the pair of pulley supports is connected by a connecting member may be employed.

Moreover, this invention is a structure cutting method using the above cutting device,
Install a pair of guide holes at intervals in the structure,
Inserting the pair of pulley supports into these guide holes respectively, circulating the wire saw by the drive motor,
At the same time, the structure cutting method is characterized in that the structure is cut by moving the pulley support along the guide hole.

Furthermore, this invention is a ground cutting method using the above cutting device,
Install a pair of guide tubes at intervals on the ground,
Inserting the pair of pulley supports into these guide tubes, respectively, circulating the wire saw with the drive motor,
At the same time, the ground support method is characterized in that the ground between the guide tubes is cut into a groove shape by moving the pulley support along the guide tubes.

  According to the present invention, since the wire saw is wound in a plurality of stages between the two pulleys to which the drive motor is coupled, the frictional force between the wire saw and the drive pulley is increased, thereby preventing the occurrence of slip. be able to. Therefore, the cutting operation can be performed smoothly. In addition, since the amount of slack generated between the two pulleys is also small, when the wire saw is wound in multiple stages between the pulleys of a pair of pulley supports, the distance between the supports, that is, between the pulley support shafts The dimensions can be increased, thereby increasing the cutting width.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a wire saw cutting apparatus according to the present invention. FIG. 1 is a plan view and FIG. 2 is a side view. In FIG. 1, an arrow A indicates the cutting direction.

  The cutting device comprises a pair of pulley supports 1, 1 extending at a distance from each other. The pulley support 1, 1 is composed of a front part 2 and a rear part 3, both of which consist of two plates 4, 4 and 5, 5. The sheath tubes 6 and 6 are respectively fixed to the rear ends of the plates 4 and 4 constituting the front portion 2, and the tip portions of the plates 5 and 5 constituting the rear portion 3 are inserted into the sheath tubes 6 and 6. ing. Thereby, the rear part 3 is movable back and forth with respect to the front part 2. That is, the pulley supports 1 and 1 are extendable. The pair of pulley supports 1 and 1 are connected between the front portions 2 and 2 by a connecting member 10 whose end portions are supported and fixed between the sheath tubes 6 and 6, and the end portions are supported between the plates 5 and 5. The rear portions 3 and 3 are connected by the fixed connecting member 11.

  A front pulley 7 is pivotally supported between the front end portion of each pulley support 1, that is, between the plates 4 and 4 of the front portion 2. A drive motor 8 that is operated by hydraulic pressure is provided on the lower surface of the lower plate 4, and this drive motor 8 is drivingly connected to the shaft of the front pulley 7 via a transmission gear (not shown) in the gear box 9. . The drive motor 8 and the gear box 9 may be provided only on one of the pair of pulley supports 1 or 1 or may be provided on both. When both are provided, the operation of the drive motor 8 is synchronized.

  A rear pulley 12 is pivotally supported on each pulley support 1 at a position spaced rearward from the front pulley 7, that is, between the plates 5 and 5 of the rear portion 3. Each of the pair of front pulleys 7 and 7 and the rear pulleys 12 and 12 is composed of two pulleys stacked coaxially, and thus has two coaxial pulley grooves. A wire saw 13 is wound around the front pulleys 7 and 7 and the rear pulleys 12 and 12 in an endless manner. The endless wire saw 13 is wound twice, that is, in two stages (or two layers) between the pair of front pulleys 7 and 7 to which the drive motor 8 is connected. The number of winding stages is not limited to two, but can be a plurality of stages of three or more. The rollers 15 provided adjacent to the pulleys 7 and 12 are for preventing the wire saw 13 from being detached from the pulley grooves.

  A cylinder 16 that is hydraulically operated is provided on the lower surface of the lower plate 5 of the rear portion 3. The rod portion of the working cylinder 16 is fixed to the lower sheath tube 6. By operating the operating cylinder 16, the rear part 3 can be urged rearward with respect to the front part 2. Thereby, the rear pulley 12 is urged rearward, and a required tension can be applied to the wire saw 13.

  According to the cutting device as described above, when the drive motor 8 is operated, the wire saw 13 circulates, and in this state, the pulley supports 1 and 1 are moved in the direction of arrow A in FIG. , 7 can be cut by the wire saw 13 portion. At that time, since the wire saw 13 is wound in two stages between the two pulleys 7 and 7 to which the drive motor 8 is connected, it is possible to prevent the occurrence of slip between the wire saw 13 and the drive pulley 7. it can.

That is, as shown in FIG. 3, the winding angle α ₁ of the wire saw 13 with respect to the drive pulley 7 can be made larger than the winding angle α ₀ of the conventional device (α ₁ > α ₀ ), and as a result, the wire saw 13 and the drive are driven. Since the frictional force with the pulley 7 increases, it is possible to prevent slipping.

  Further, since the amount of sag generated between the pulleys 7 and 7 is also reduced, the distance between the pair of pulley supports 1 and 1, that is, the dimension between the pulley support shafts can be increased, thereby increasing the cutting width. Can do. Further, since the object to be cut is cut by the two wire saws 13 between the pair of pulley supports 1, 1 and the pulleys 7, 7, the thickness of the groove formed by cutting can be increased. .

  The installation form of the pulley and the winding form of the wire saw can be various. FIG. 4 conceptually shows this, and (a) shows the configuration of the apparatus shown in FIGS. (B) has shown the form which wound the wire saw 13 between the back pulleys 12 and 12 in two steps. In this case, a drive motor is connected to one or both of the rear pulleys 12 and 12, and one or both of the rear pulleys 12 and 12 become drive pulleys (hereinafter, the wire saw 13 is wound in two stages (c) to The same applies to the pulley (f). In this embodiment, the object is first cut at one wire saw 13 portion between the front pulleys 7 and 7, and then the object is cut at two wire saw 13 portions between the rear pulleys 12 and 12. Therefore, the thickness of the cutting groove can be increased stepwise.

  (C) has shown the form which wound the wire saw 13 in two steps between the front pulley 7 and the rear pulley 12 of one pulley support body 1. FIG. In this form, the object is cut by one wire saw 13 portion.

  (A) to (c) are four pulley arrangements, and these pulleys are installed at the apex positions of the quadrilateral, respectively. As shown in (d) to (f), the pulleys are 3 In other words, the present invention can also be applied to the case where each of the rear pulleys 12 is installed at the apex position of the triangle. (D) has shown the form which wound the wire saw 13 in two steps between the front pulleys 7 and 7 in such a pulley installation form. (E) has shown the form which wound the wire saw 13 in two steps between the front pulley 7 and the rear pulley 12 of one pulley support body 1. FIG. (F) has shown the form which wound the wire saw 13 in two steps between the front pulley 4 of one pulley support body 1 and the rear pulley 12 of the other pulley support body 1. FIG.

  5-7 has shown embodiment of the structure cutting method using the above-mentioned cutting device. As shown in FIG. 5, in order to discharge sediment deposited on the upstream side of a concrete dam such as a sabo dam, the dam body 20 may be cut into a square to form a discharge path 21. The above-described cutting device can be applied to this construction method. Hereinafter, the construction method will be described.

  First, as shown in FIG. 6, a pair of upper and lower guide holes 22 are provided in the dam body 20 by boring between the upstream and downstream sides. Then, as shown in a horizontal sectional view in FIG. 7, the pair of pulley supports 1, 1 of the cutting device are inserted into the guide holes 22, 22, respectively. Here, a pulling member 23 such as a PC steel wire is attached to the tip of the pair of pulley supports 1, 1.

  Then, the wire saw 13 is circulated by the operation of the drive motor 8, and simultaneously, the concrete between the guide holes 22, 22 is cut by pulling the pulley supports 1, 1 by the pulling member 23. Such a cut is performed between all the guide holes 22, thereby cutting the dam body 22 into a quadrangle, and a quadrangular prism-shaped cutting block 25 (which is surrounded by the four cutting grooves 24 in FIG. 6). Pull out the part) and remove it. As a result, the discharge path 21 as shown in FIG. Note that the cutting device is not limited to towing, and may be made to enter the concrete by propulsion (pushing) with a hydraulic jack or the like.

  As described above, the cutting device applied to the above construction method reduces the amount of sag between the pulleys 7 and 7, so that the distance between the pair of pulley supports 1, 1, that is, the dimension between the pulley support shafts is increased. Can take. Therefore, according to it, the space | interval between the guide holes 22 and 22 can be taken large, and the width | variety which can be cut | disconnected by one cutting | disconnection can be enlarged.

  Further, since the concrete can be cut by the two wire saws 13, the thickness of the cutting groove 24 (see FIG. 6) formed by cutting can be increased. Incidentally, in the conventional method in which a wire saw is wound around a concrete structure in a U shape, since the wire saw is cut at one wire saw portion, the thickness of the cutting groove is small and it is difficult to remove the cutting block. On the other hand, in the method using the cutting apparatus of the present invention, the thickness of the cutting groove 24 is increased, so that the cutting block can be easily removed.

  Although the said construction example is an example which cut | disconnects a concrete dam, also when cutting earth structures, such as an earth dam, as a structure, the said cutting device can be used. In this case, when the guide hole 22 may collapse, the guide tube is inserted into the boring hole. The cutting construction form of the structure is to cut the structure in the horizontal direction by moving the cutting device in the horizontal direction, but it is also possible to cut the structure in the vertical direction by moving the cutting device in the vertical direction. Is possible.

  The cutting device of the present invention can also cut the ground, for example, in the case of constructing a water blocking wall in the ground. In this case, if the boring hole is used as it is as the guide hole, the hole wall will be collapsed, so the guide tube is inserted into the boring hole. Other than that, it is exactly the same as the procedure for cutting the structure. When the ground is cut, the cutting can be performed in any of the vertical direction, the horizontal direction, and the oblique direction as in the case of cutting the structure. Also, when the structure is in contact with the ground, it can be cut together with the ground.

  Further, if the cutting width is smaller than the dimension between the pulley support shafts, such as a fume pipe or a concrete retaining wall, it is possible to cut without providing the guide hole.

  The above embodiment is merely an example, and the present invention can take various forms. For example, in the above embodiment, in order to apply tension to the wire saw, the pulley support body is composed of a front part and a rear part so as to be stretchable. However, such a structure is not adopted and the shaft of the rear pulley is supported. Therefore, it is possible to adopt a configuration in which the hole provided in the pulley support is a long hole, whereby the rear pulley can be moved back and forth, and a hydraulic cylinder is connected to the shaft of the rear pulley.

It is a top view which shows embodiment of the cutting device by the wire saw of this invention. It is a side view of the embodiment. It is a figure for demonstrating the difference in the winding angle of the wire saw of a conventional apparatus and this invention apparatus. It is a figure which illustrates the installation form of a pulley, and the winding form of a wire saw. It is sectional drawing which shows embodiment of the structure cutting method. It is a front view of the embodiment. It is a horizontal sectional view of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pulley support body 2 Front part 3 Back part 4 Plate 5 Plate 6 Sheath pipe 7 Front pulley 8 Drive motor 10 Connection member 11 Connection member 12 Back pulley 13 Wire saw 15 Roller 16 Actuation cylinder 20 Structure (dam body)
21 sedimentation sediment discharge path 22 guide hole 23 pulling member 24 cutting groove 25 cutting block

Claims (6)

A pair of pulley supports extending in parallel and spaced from each other;
A pair of front pulleys each pivotally supported at the tip of these pulley supports;
A rear pulley that is pivotally supported on at least one pulley support so as to be spaced rearward from the front pulley;
A wire saw wound endlessly on each pulley;
Tension applying means for applying tension to the wire saw;
A drive motor for circulating the wire saw,
The wire saw is wound in multiple stages between two pulleys adjacent to each other,
A wire saw cutting device, wherein the drive motor is drivingly connected to at least one of the two pulleys wound around the plurality of stages.   The wire saw cutting device according to claim 1, wherein the wire saw is wound in a plurality of stages between the pair of front pulleys.   The tension applying means comprises means for supporting the rear pulley movably in the front-rear direction on the pulley support, and a biasing member for biasing the rear pulley rearward. The cutting apparatus by the wire saw of 2.   The wire saw cutting apparatus according to any one of claims 1 to 3, wherein the pair of pulley supports are connected by a connecting member. A structure cutting method using the wire saw cutting device according to any one of claims 1 to 4,
Install a pair of guide holes at intervals in the structure,
Inserting the pair of pulley supports into these guide holes respectively, circulating the wire saw by the drive motor,
At the same time, the structure is cut by moving the pulley support along the guide hole. A ground cutting method using the wire saw cutting device according to any one of claims 1 to 4,
Install a pair of guide tubes at intervals on the ground,
The pair of pulley supports are inserted into these guide tubes, respectively, and the wire saw is circulated by the drive motor,
A ground cutting method characterized in that the ground between the guide tubes is cut into a groove shape by simultaneously moving the pulley support along the guide tubes.

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