JP5406089B2 - Ground cutting machine - Google Patents

Description

  The present invention relates to a ground cutting device, and more specifically, for example, a protection plate that protects a ground when a tunnel that crosses the traveling road is constructed on the ground below a vehicle traveling road such as a railway track or a road. The present invention relates to an apparatus for cutting the natural ground into a groove shape for insertion.

    Conventionally, when constructing a tunnel (underground structure) that crosses the traveling road on the ground below the vehicle traveling road such as a railroad track or a road, a construction method has been adopted in which a protective plate is inserted into the ground to protect it. Yes.

  As one of the protective methods, the applicant previously proposed a method in which a protective plate (steel plate) is inserted into the cutting portion while cutting a natural ground horizontally with a flexible cutting tool such as a wire saw. (For example, refer to Patent Document 1). This construction method is an extremely effective construction method that can prevent the deformation of the natural ground and, in the case of a railroad track, the deformation of the track.

  Hereinafter, an outline of this construction method will be described with reference to FIG. 10 (FIG. 1 shown in Patent Document 1) which is a conventional example. A start shaft 2 and a reach shaft 3 are constructed on both sides of the road 1 such as a railroad track or a road. A pair of guide pipes 5 a and 5 b that form guide holes at intervals corresponding to the width dimension of the protective steel plate (protective plate) 4 are inserted in the natural ground between the starting vertical shaft 2 and the reaching vertical shaft 3. . As these guide tubes 5a and 5b, synthetic resin tubes such as vinyl chloride are used.

  The guide tubes 5a and 5b accommodate cutting pulley support mechanisms 6a and 6b and clamp mechanisms 7a and 7b for the protective steel plate 4 so as to be movable in the tube axis direction. A main pulley 10 that circulates and runs the wire saw 8 outside and inside the shaft 3, an adjustment pulley 9 that adjusts the feeding length of the wire saw 8 into the guide pipes 5 a and 5 b, and a direction change for changing the direction of the wire saw 8. A pulley 11 is installed.

  The wire saw 8 wound around the main pulley 10, the adjustment pulley 9, and the direction changing pulley 11 is fed into one guide pipe 5a, and is supported by a support mechanism 6a, so as to cross a natural ground between the guide pipes 5a, 5b. It is wound around a pulley 6b for cutting and pulled out of the natural ground through the other guide tube 5b. This endless wire saw 8 is a well-known one in which a number of diamond bits are attached at appropriate intervals to a wire, and is known as a cutting tool for cutting reinforced concrete. A chain saw can be used in place of the wire saw.

  The reaching shaft 3 is provided with a traction jack 13 that operates by obtaining a reaction force from the reaction wall 12. A PC steel bar (tensile material) 14 held by the pulling jack 13 passes through the guide tubes 5a and 5b and is connected to the clamp mechanisms 7a and 7b. With the apparatus configuration as described above, while rotating the main pulley 10, the main pulley 10 is moved by a predetermined distance in a direction away from the reaching shaft 3, tension is applied to the wire saw 8, and the ground between the guide pipes 5 a and 5 b is grooved To cut. At the same time, the PC steel bar is pulled by the pulling jack 13 and the protective steel plate 4 is inserted into the cutting groove.

  However, in the above construction method, the length of the wire saw 8 inside the natural ground necessary for cutting the natural ground becomes shorter as the cutting progresses from the start of the cutting at the start shaft 2. In other words, as the cutting proceeds, the length (extra length) of the wire saw 8 drawn out to the outside of the natural ground becomes longer. A plurality of adjustment pulleys 9 are installed to store the extra length of the wire saw 8, but the extra length of the wire saw that can be accommodated depends on the arrangement of each member such as the driving device of the main pulley 10. There was a limit. For this reason, it was conventionally applicable only to a construction section of about 15 m, and it was difficult to apply to a construction section having a length longer than that.

  Further, in the conventional apparatus, the entire drive unit including the main pulley 10 is moved and the wire saw 8 is pulled to apply tension to the wire saw to prevent the slip. However, this method cannot completely cope with the loosening of the wire saw accompanying ground cutting or excessive tension.

  In addition, although the cutting soil is attached to the wire saw due to ground cutting, in order to remove the cutting soil, conventionally, water has been poured into the cutting guide pulley supported by the support mechanisms 6a and 6b to clean the wire saw. It was. However, the excess water adhering to the wire saw cuts the earth and sand more than necessary, causing a deflection in the protective steel sheet inserted immediately after. In addition, cutting earth and sand have accumulated in the guide tube 5b on the pull back side of the wire saw 8, and it has been necessary to wash away with a high pressure washer or the like.

JP 2007-332733 A

The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is to provide a ground cutting device capable of increasing the amount of storage of a flexible cutting tool such as a wire saw, and thereby greatly extending a ground cutting cutting section. is there.

Another object of the present invention is to provide a ground cutting device capable of adjusting a tension applied to a flexible cutting tool.
Still another object of the present invention is to provide a ground cutting device that does not cause deflection of a protective plate inserted immediately after ground cutting, and does not require cleaning of a guide hole of a flexible cutting tool. It is in.

The present invention employs the following means in order to achieve the above object.
That is, the present invention is an endless shape which is fed from one of the pair of guide holes formed in the natural ground from the outside of the natural ground, traverses the natural ground between the guide holes, and is pulled back to the outside of the natural ground through the other guide hole. A natural ground cutting device for cutting natural ground into a groove shape with a flexible cutting tool such as a wire saw,
A machine frame that has a rectangular parallelepiped shape as a whole,
A main pulley provided inside the machine frame, having a horizontal axis, and reciprocating along the longitudinal direction of the machine frame;
A plurality of adjustment pulleys having a horizontal axis parallel to the axis of the main pulley provided on the side surface along the longitudinal direction of the machine frame so as to form two rows spaced apart from each other and along the longitudinal direction When,
The flexible cutting tool wound around the main pulley and the adjustment pulley,
Each of the adjustment pulleys is a natural ground cutting device in which the flexible cutting tool can be wound around a plurality of stages.
It is in.

In the above ground cutting device,
Two pressing pulleys respectively provided on a feeding side portion and a pulling back side portion of the flexible cutting tool near the main pulley;
It is possible to employ a configuration provided with a non-slip device for a flexible cutting tool, which has an urging member that urges the pressing pulley so that the feeding side portion and the withdrawal side portion approach each other.

In the above ground cutting device,
A direction-changing pulley that is provided at a portion of the flexible cutting tool that is pulled back to the main pulley, and for raising and lowering the flexible cutting tool;
A cleaning cylinder into which one of the rising part or the falling part of the flexible cutting tool is inserted;
A configuration provided with a cleaning device for a flexible cutting tool, which is provided in the upper portion of the cleaning cylinder and has a water supply pipe for supplying cleaning water to the inside of the cylinder, can be employed.

  In this case, the said washing | cleaning cylinder can employ | adopt the structure which has a cyclone part. Further, the cleaning device has a tank below the cleaning cylinder, and this tank is divided into a muddy water chamber for receiving earth and sand washed away by the cleaning water flow and a cleaning water chamber for supplying the cleaning water to the cleaning cylinder. In addition, it is possible to adopt a configuration in which the supernatant water of the muddy water chamber can overflow into the washing water chamber.

  According to this invention, each of the adjustment pulleys arranged in two rows on the machine frame can wind the flexible cutting tool in a plurality of stages. Even if the surplus length increases, the surplus length can be stored. Therefore, the construction section for ground cutting can be extended significantly.

  Further, according to the present invention, since the pressing pulley that presses the feeding side portion and the pulling back side portion of the flexible cutting tool close to each other by the biasing force of the biasing member is provided near the main pulley. When excessive force is applied to the flexible cutting tool during mountain cutting or when the flexible cutting tool is loosened, the pressing pulley adjusts the tension of the flexible cutting tool, and the flexible cutting tool A predetermined tension always acts on. Therefore, sliding of the flexible cutting tool can be prevented, and troubles during ground cutting can be avoided.

  Further, according to the present invention, the cleaning device having the cleaning cylinder into which the rising portion or the lowering portion is inserted is provided in the pull-back side portion of the flexible cutting tool to the main pulley. During the circulation running, the cleaning device is always cleaned, and the flexible cutting tool to which the cleaning water is not attached is returned to the main pulley. Therefore, since the cutting efficiency of the natural ground is not lowered and it is not necessary to spray the cleaning water at the tip pulley portion in the feed side guide pipe as in the conventional case, the protective plate inserted immediately after the natural ground cutting. Therefore, the guide hole of the flexible cutting tool need not be cleaned.

It is a top view which shows embodiment of the natural ground cutting device by this invention. It is a front view of the embodiment. It is a side view of the embodiment. It is a front view which shows a washing | cleaning apparatus. It is a front view which shows the moving mechanism of a main pulley. It is a side view of the movement mechanism. It is a top view at the time of setting horizontally and showing the installation mode of a ground cutting device. It is a top view at the time of setting a natural ground cutting apparatus vertically. It is a vertical direction sectional view at the time of installing a natural ground cutting device inside and outside a traction stand. A prior art example is shown, (a) is a horizontal direction sectional view, (b) is a vertical direction sectional view.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, the machine frame 50 of the ground cutting machine has a rectangular parallelepiped shape whose upper surface and four side surfaces are open, and is installed on the arrival side of the protective steel plate shown in FIG. 10. . Inside the machine casing 50, a main pulley 51 is installed at a position closer to one side surface along the longitudinal direction. The main pulley 51 has a horizontal shaft 52 perpendicular to the longitudinal direction of the machine casing 50, and the horizontal shaft 52 is connected to a drive motor 53. The drive motor 53 is mounted on a guide 80 provided in the machine frame 50 along the longitudinal direction thereof, and can reciprocate on the guide 80. The reciprocating mechanism of the drive motor 53 will be described later.

  A large number of adjustment pulleys 54 a and 54 b are provided on the other side surface of the machine frame 50 along the longitudinal direction. The adjustment pulleys 54a and 54b are provided so as to form two rows spaced apart from each other in the vertical direction. Reference numeral 54a indicates an adjustment pulley having an upper row, and reference numeral 54b indicates a lower portion. It is an adjustment pulley that forms a row. These adjustment pulleys 54 a and 54 b have a horizontal shaft 55 parallel to the main pulley 51. Each of the adjustment pulleys 54 a and 54 b has a plurality of pulleys 56 that are arranged in a plurality of stages so as to be coaxial with the horizontal shaft 55.

  In the machine frame 50, in addition to the main pulley 51 and the adjustment pulleys 54a and 54b, a plurality of feeding side direction changing pulleys 57, 58, and 59 for feeding the wire saw 65 into the ground, and the wire saw 65 are pulled back to the main pulley 51. For this purpose, a plurality of pull-back side direction change pulleys 60, 61, 62, 63 are provided. The wire saw 65 wound around the main pulley 51 is wound around an upper adjustment pulley 54a and a lower adjustment pulley 54b through a plurality of direction change pulleys 57, 58 by a feeding side portion 65a indicated by a broken line in the drawing. It has been. In the upper and lower adjustment pulleys 54a and 54b, the wire saw 65 is alternately arranged on the upper and lower adjustment pulleys 54a and 54b or the upper adjustment pulleys 54a adjacent to each other (the same applies to the adjustment pulley 54b) according to the extra length. It is wound continuously. Furthermore, the wire saw 65 is wound around the direction change pulley 59 and is fed into the natural ground.

  The path of the wire saw 65 in the natural ground is almost the same as the conventional one shown in FIG. That is, it is inserted into one of a pair of guide pipes 5a and 5b provided on the ground, and is wound around the pulley between the guide pipes around the pulleys of the pulley support mechanisms 6a and 6b as shown in FIG. And is pulled out of the natural ground through the other guide tube. The pull-back side portion 65b of the wire saw 65 shown by a solid line in the drawings of FIGS. 1 to 3 drawn out to the outside of the natural ground passes through the plurality of direction changing pulleys 60, 61, 62, 63 and passes through the main pulley 51. It has been returned to.

  The ground cutting device of the present invention includes a slip prevention device for the wire saw 65. The slip prevention device includes the direction change pulleys 57 and 63 disposed in the wire saw feed-out side portion 65a and the pull-back side portion 65b near the main pulley, and the pulleys 57 and 63 to bias the wire saws 65a and 65b so as to approach each other. It is comprised by the air cylinder 76 provided in. In this embodiment, the direction change pulleys 57 and 63 also serve as pressing pulleys that press the wire saws 65a and 65b.

  Further, the ground cutting device of the present invention includes a cleaning device for the wire saw 65. The cleaning device includes direction changing pulleys 61, 62, and 63 that raise and lower the wire saw 65 b on the pull back side, a cleaning cylinder 66, and a tank 67. FIG. 4 shows details of the cleaning device. The cleaning cylinder 66 includes a water supply unit 70 that is a large-diameter portion at the top, a tapered cyclone portion 71 that decreases in diameter as it goes below the intermediate portion, and a cleaning unit 72 that is a small-diameter portion at the bottom. Yes.

  The wire saw 65 b on the pullback side is inserted into the cleaning cylinder 66 at its rising portion. A water supply pipe 73 for supplying cleaning water is opened in the water supply unit 70. The inside of the tank 67 is partitioned by a partition plate 74. One chamber partitioned by the partition plate 74 is a muddy water chamber 68 that stores muddy water that is generated by washing the wire saw 65b and falls. The other chamber is a cleaning water chamber 69 for storing cleaning water. The muddy water stored in the muddy water chamber 68 sinks its sediment, and the supernatant water overflows and flows into the washing water chamber 69. A pump 75 is disposed in the cleaning water chamber 69, and cleaning water is supplied to the water supply unit 70 through the water supply pipe 73. That is, the wash water is circulated.

  5 and 6 show a reciprocating mechanism of the drive motor 53 of the main pulley 51. FIG. A travel rail 81 for the drive motor 53 is provided on the guide 80. An endless chain 82 is disposed inside and outside the guide 80 along its longitudinal direction, and a drive motor 53 is connected to the endless chain 82. A block 83 is disposed inside the guide 80, and an endless chain 82 is connected to the block 83. The block 83 is connected to a rod of a hydraulic cylinder 84 disposed in the guide 80. By the operation of the hydraulic cylinder 84, the endless chain 82 travels in the forward and reverse directions, and accordingly, the drive motor 53 reciprocates on the guide 80.

  Next, the operation of the above ground cutting device will be described. When the main pulley 51 is rotated by the drive motor 53, the wire saw 65 circulates through the inside of the natural ground. At the same time, when the drive motor 53 is moved in the direction away from the natural ground (direction of arrow A in FIG. 1) by the operation of the hydraulic cylinder 84, the natural ground between the guide tubes 5a and 5b shown in FIG. 10 is cut. As described above, the protective steel sheet is inserted into the groove formed by cutting the ground.

  When the movement of the drive motor 53 reaches one stroke, the rotation of the main pulley 51 is stopped, and the drive motor 53 is moved and stopped in the direction toward the natural ground contrary to the above. As a result, a surplus length is generated in the wire saw 65, and the number of windings around the adjustment pulleys 54a and 54 is increased to absorb this surplus length. Then, the drive motor 53 is rotated and moved again, and the same operation as described above is repeated to cut the ground.

  In the natural ground cutting as described above, the extra length of the wire saw 65 increases as the cutting progresses. In the present invention, since the adjustment pulleys 54a and 54b arranged in two rows on the machine frame are composed of a plurality of stages of pulleys 56, even if the extra length of the wire saw 65 increases, the extra length can be stored. Therefore, the construction section for ground cutting can be extended significantly.

  Further, in the present invention, the slip of the wire saw 65 at the main pulley 51 is prevented. That is, the feeding-side wire saw 65a and the withdrawal-side wire saw 65b are pressed by the air cylinder 76 near the main pulley 51 so as to always approach each other via the pressing pulleys 57 and 63. As a result, when excessive force is applied to the wire saw 65 during ground cutting or when the wire saw 65 is loosened, the pressing pulleys 57 and 63 adjust the tension of the wire saw 65. The tension of will act. Therefore, it is possible to prevent the wire saw 65 from slipping and to avoid trouble during ground cutting.

  In the present invention, the wire saw 65 is always cleaned by the cleaning device shown in FIG. 4 while the wire saw 65 is circulating. That is, the cleaning water is constantly supplied from the water supply pipe 73 to the water supply unit 70. The wire saw 65b on the withdrawal side is first subjected to washing water in the washing unit 72. And since the spiral water flow is produced in the cyclone part 71, the cutting earth and sand adhering to the wire saw 65b is washed away by this water flow. Further, since the wire saw 65b is generally twisted, the cutting force remaining on the wire saw 65b and the adhering cleaning water are blown off by the water supply section 70 by the return force. Furthermore, the remaining cleaning water is blown off by the centrifugal force generated by the deflection of the traveling path of the wire saw at the direction changing pulley or the pressing pulley 63 arranged in the path from the cleaning device to the main pulley 51.

  Therefore, the wire saw 65a to which the cleaning water is not attached is fed out to the natural ground, and the cutting efficiency of the natural ground is not reduced. This eliminates the need to inject cleaning water at the tip pulley in the feed-side guide tube as in the prior art, so it is inserted immediately after cutting the earth and soil by cutting the soil with the cleaning water adhering to the wire saw. The protective plate does not bend, and it is not necessary to clean the cutting soil accumulated on the return side guide tube of the wire saw 65. Furthermore, since the wash water is circulated, the amount of water used can be reduced. In FIG. 4, a member denoted by reference numeral 79 is a water droplet scattering prevention lid.

  The ground cutting device of this invention can take various installation modes. FIG. 7 is a plan view in the case where the machine casing 50 is placed horizontally (installation method in which the longitudinal direction of the machine casing 50 is parallel to the installation surface). In this case, a method of installing the machine frame 50 so that the longitudinal direction of the machine frame 50 is perpendicular to the reaching earth retaining surface 90 of the protective steel plate as shown in FIG. 10A, or the reaching earth retaining surface as shown in FIG. A method of installing the machine casing 50 so that the longitudinal direction of the machine casing 50 is parallel to 90 can be adopted.

  FIG. 8 is a plan view in the case where the machine casing 50 is placed vertically (installation method in which the longitudinal direction of the machine casing 50 is perpendicular to the installation surface). Furthermore, not only the machine frame 50 is installed outside the reaching shaft, but also a method of installing the machine frame 50 in the reaching shaft as shown in FIG. In this case, the machine frame 50 can be installed in a protective steel plate traction stand as shown in FIG. 9A, or can be installed on the traction stand as shown in FIG.

  The above embodiment is merely an example, and the present invention can take various forms. For example, in the above embodiment, the adjustment pulleys 54a and 54b are configured by the plurality of pulleys 56 that are coaxially stacked in order to allow the wire saw 65 to be wound around the adjustment pulleys 54a and 54b in a plurality of stages. The pulley structure may be provided with a plurality of pulley grooves.

  In the above embodiment, in the cleaning device, the rising portion of the lifting portion of the wire saw 65a on the pull-back side passes through the cleaning tube 66, but the falling portion may pass through the cleaning tube 66. Furthermore, the reciprocating mechanism of the main pulley 51 can also adopt a rack and pinion method instead of the method using the chain 82 and the hydraulic cylinder 84.

DESCRIPTION OF SYMBOLS 50 Machine frame 51 Main pulley 53 Drive motor 54a, 54b Adjustment pulley 57, 58, 59 Direction change pulley 57, 63 Press pulley 65 Wire saw 65a Feed-side wire saw 65b Pull-back side wire saw 66 Cleaning cylinder 69 Cleaning water chamber 71 Cyclone part 73 Water supply pipe 76 Air cylinder 80 Guide 81 Traveling rail 82 Endless chain

Claims (5)

Flexible, such as an endless wire saw, which is drawn from the outside of the natural ground to one of a pair of guide holes formed in the natural ground, traverses the natural ground between the guide holes, and is pulled back to the outside of the natural ground through the other guide hole A natural ground cutting device for cutting a natural mountain into a groove shape with a reversible cutting tool,
A machine frame that has a rectangular parallelepiped shape as a whole,
A main pulley provided inside the machine frame, having a horizontal axis, and reciprocating along the longitudinal direction of the machine frame;
A plurality of adjustment pulleys having a horizontal axis parallel to the axis of the main pulley provided on the side surface along the longitudinal direction of the machine frame so as to form two rows spaced apart from each other and along the longitudinal direction When,
The flexible cutting tool wound around the main pulley and the adjustment pulley,
Each of the adjusting pulleys is capable of winding the flexible cutting tool in a plurality of stages. The ground cutting device according to claim 1,
Two pressing pulleys respectively provided on a feeding side portion and a pulling back side portion of the flexible cutting tool near the main pulley;
A ground cutting device comprising a flexible cutting tool slip prevention device having an urging member that urges the pressing pulley so that the feeding side portion and the withdrawal side portion approach each other. The ground cutting device according to claim 1,
A direction-changing pulley that is provided at a portion of the flexible cutting tool that is pulled back to the main pulley, and for raising and lowering the flexible cutting tool;
A cleaning cylinder into which one of the rising part or the falling part of the flexible cutting tool is inserted;
A ground cutting device comprising a flexible cutting tool cleaning device provided at an upper portion of the cleaning tube and having a water supply pipe for supplying cleaning water into the cylindrical body. In the natural ground cutting device according to claim 3,
The cleaning cylinder has a cyclone portion, and is a natural ground cutting device. In the natural ground cutting device according to claim 3 or 4,
The cleaning device has a tank below the cleaning cylinder, and the tank is divided into a muddy water chamber for receiving earth and sand washed away by a cleaning water flow, and a cleaning water chamber for supplying cleaning water to the cleaning cylinder. 3. The ground cutting device according to claim 2, wherein the supernatant water of the muddy water chamber can overflow into the washing water chamber.

Images