JP4198165B2 - Ground cutting machine - Google Patents

Description

  The present invention relates to a ground cutting device, and more particularly, for example, a plate that protects a natural ground is inserted in a tunnel that traverses the traveling road on the ground below a vehicle traveling road such as a railway track or a road. The present invention relates to a device for cutting the natural ground into a groove shape.

  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 is adopted in which a protective member is inserted into the ground in advance 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. (See Patent Document 1 and Patent Document 2). 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.

  Specifically, as described in Patent Document 2, the wire saw is wound around the pulleys of the pulley support mechanism respectively accommodated in the pair of guide tubes so as to cross between the guide tubes. The ground between the guide tubes is cut by running the pulley support mechanism in the guide tubes. In order to travel the pulley support mechanism, in the technique described in the document, a rail is installed in the guide tube, and the pulley support mechanism travels on the guide rail.

However, since the guide pipe needs to be equivalent to the tunnel length, the extension distance is long, so that not only the guide rail installation work requires much effort but also time. Further, in order to improve the installation accuracy of the protective plate, it is necessary to consider both the installation accuracy of the guide rail and the installation accuracy of the pulley support mechanism.
JP 2004-204624 A JP 2005-336865 A

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 eliminate the need for installing guide rails in an apparatus for cutting a natural ground with a flexible cutting tool such as a wire saw wound around the pulley support mechanism, in which the pulley support mechanism runs in the guide tube. It is an object of the present invention to provide a natural ground cutting device that can improve the efficiency and shorten the construction period of cutting work and can improve the installation accuracy of a protective plate inserted into the natural ground.

The present invention employs the following means in order to achieve the above object.
That is, the present invention includes a pulley support mechanism for supporting a cutting pulley that is movably accommodated in a pair of guide tubes installed in a horizontal direction on a natural ground, respectively, and the pulley support mechanism. A flexible cutting tool such as a wire saw wound around a supported cutting pulley so as to cross a ground between the guide tubes, and a rear of the pulley support mechanism in each guide tube so as to be movable in the tube axis direction. A ground cutting device comprising a clamping mechanism for clamping both sides of the front end of a protective plate that is housed and inserted into a cutting portion of the ground cut by the cutting tool ,
The pulley supporting mechanism and the clamping mechanism, each have a holder portion that is disposed perpendicular to the tube axis at its front and rear, a plurality of traveling in contact with the inner peripheral surface of the guide tube to the outer periphery of each of the holder portions Traveling members are provided at intervals in the circumferential direction ,
The rear holder part of the pulley support mechanism and the front holder part of the clamp mechanism are capable of separating both holder parts in the tube axis direction of the guide tube and prevent circumferential rotation of the guide tube of the pulley support mechanism. The ground cutting device is connected by connecting means .

  A tension member for pulling the protective plate is connected to the clamp mechanism. The connecting means includes a rod provided in one of the rear holder of the pulley support mechanism and the front holder of the clamp mechanism in the tube axis direction, and the other of the rear holder of the pulley support mechanism and the front holder of the clamp mechanism. It is possible to adopt a configuration in which the rod is provided with a hole that fits movably in the tube axis direction.

Further, in the above ground cutting device, the cutting tool is wound endlessly through the inside of each guide tube between a driving pulley installed outside the guide tube and the pulley for cutting, An auxiliary pulley support mechanism for supporting an auxiliary pulley that is housed in front of the pulley support mechanism so as to be movable in the direction of the pipe axis and prevents sagging of the cutting tool,
The auxiliary pulley support mechanism has holder portions arranged at right and left portions of the auxiliary pulley support mechanism at right angles to the tube axis, and a plurality of traveling members that run in contact with the inner peripheral surface of the guide tube are arranged around the outer periphery of each holder portion. It is provided at intervals in the direction.

  A roller can be used as the traveling member.

  In the present invention, “a plurality of traveling members in contact with the inner peripheral surface of the guide tube” means that the traveling members of the pulley support mechanism are all in contact with the inner peripheral surface of the guide tube. It is a concept that includes not only the state but also a state in which some traveling members are in contact with the inner peripheral surface of the guide tube and other traveling members are not in contact with each other.

  According to this invention, the pulley support mechanism, and further the clamp mechanism and the auxiliary pulley support mechanism are moved by the travel of the travel member in contact with the inner peripheral surface of the guide tube. For this reason, it is not necessary to install a guide rail inside the guide tube, and work efficiency can be improved and the construction period can be shortened.

  In addition, since each mechanism is positioned with high accuracy by the traveling member in contact with the inner peripheral surface of the guide tube, it is possible to improve the accuracy of ground cutting and thus the installation accuracy of the protective plate. Furthermore, by changing the mounting position of the traveling member, it is possible to correspond to guide tubes of various diameters or to be eccentric with respect to the guide tube.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic view showing an embodiment of the present invention, in which (a) is a horizontal sectional view and (b) is a vertical sectional view. 2 and 3 are detailed views showing an embodiment of the present invention. FIG. 2 is a plan view and FIG. 3 is a side view. 4A to 4D are cross-sectional views taken along lines AA to DD in FIG. 3, respectively, and FIGS. 5E to 5H are lines EE to H in FIG. FIG.

  As shown in FIG. 1, a start shaft 2 and a reach shaft 3 are built on both sides of a road 1 such as a railroad track or a road. A pair of guide pipes 5 a and 5 b is installed in the natural ground between the starting shaft 2 and the reaching shaft 3 at an interval corresponding to the width dimension of the protective steel plate (protective plate) 4. 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 plurality of adjustment pulleys 9 and a drive pulley 10 for adjusting the direction change and the feeding length of the wire saw 8 are installed inside and outside the reach shaft 3.

  The wire saw 8 wound around the drive pulley 10 and the adjustment pulley 8 passes through the guide pipes 5a and 5b, and further, the cutting pulleys 11a and 11b (see FIG. 5) so as to cross the ground between the guide pipes 5a and 5b. 2). 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 member) 14 held by the traction jack 13 passes through the guide tubes 5a and 5b and is connected to the clamp mechanisms 7a and 7b (details will be described later).

  As shown in the detailed views of FIGS. 2, 3, 4 and 5, the pulley support mechanisms 6a and 6b have a support portion 15 and a holder portion 16 fixed to the front and rear portions thereof. The support portion 15 includes a pair of plays 17, and two cutting pulleys 11 a and 11 b are pivotally supported between the plates 17 for each of the support mechanisms 6 a and 6 b. The endless wire saw 8 is wound around the pulleys 11a and 11b so as to have two stages. The reason why it is wound in two stages is to increase the width of the cutting groove, as described in JP-A-2005-336865 (Patent Document 2).

  The holder portion 16 is composed of a pair of generally circular plates 18 disposed at right angles to the tube axes of the guide tubes 5a and 5b, and a plurality of traveling rollers 19 are spaced apart in the circumferential direction between these plates 18. Is provided. Specifically, as shown in FIG. 4D, each traveling roller 19 is pivotally supported between a pair of brackets 20 fixed between the plates 18, and the peripheral surface thereof is the inner periphery of the guide tubes 5a and 5b. It touches the surface. The travel roller 19 allows the pulley support mechanisms 6a and 6b to travel in the guide tubes 5a and 5b.

  The clamp mechanisms 7a and 7b are arranged behind the pulley support mechanisms 6a and 6b so as to be separated from the pulley support mechanisms 6a and 6b, and have a clamp portion 21 and a holder portion 22 fixed to the front and rear portions thereof. The clamp portion 21 includes a base plate 23 and a clamp plate 24, and both end portions 25 of the front end of the protective steel plate 4 are sandwiched between the plates 23 and 24 and are fixed by bolts 26. A fixing portion 27 for fixing the end portion of the PC steel bar 14 is provided at the front and rear portions of the clamp portion 21.

  The holder part 22 has the same structure as the holder part 16 of the pulley support mechanisms 6a and 6b, and the same reference numerals are given to the respective constituent members. The clamp mechanisms 7a and 7b can travel in the guide tubes 5a and 5b by the travel roller 19 provided in the holder portion 22.

  In the guide tubes 5a and 5b, auxiliary pulley support mechanisms 28a and 28b are accommodated in front of the pulley support mechanisms 6a and 6b. The auxiliary pulley support mechanisms 28a and 28b have a support portion 29 and a holder portion 30 fixed to the front and rear portions thereof, similarly to the pulley support mechanisms 6a and 6b. The support portion 29 is composed of a pair of plates 31, and two auxiliary pulleys 32 arranged in a direction perpendicular to the tube axis are pivotally supported between these plates 31. The wire saw 8 passes between these auxiliary pulleys 32 so that sagging is prevented.

  The holder part 30 has the same structure as the holder part 16 of the pulley support mechanisms 6a and 6b, and the same reference numerals are given to the respective constituent members. The auxiliary pulley support mechanisms 28a and 28b can travel in the guide tubes 5a and 5b by the traveling roller 19 provided in the holder portion 30. The auxiliary pulley support mechanisms 28a and 28b are connected to the pulley support mechanisms 6a and 6b via a pipe 33, and the wire saw 8 is passed through the pipe 33. Although not shown, in the guide tube 5a on the slack side of the wire saw 8, a plurality of auxiliary pulley support mechanisms 28a and 28b are provided at an appropriate interval, and these auxiliary pulley support mechanisms are also connected by a pipe 33.

  As shown in FIGS. 4 and 5, the end portion of the existing protective steel plate 35 protrudes into the guide tube 5a. In order to avoid interference with the existing protective steel plate 35, or in order to avoid interference with the existing protective steel plate joint when connecting steel plates by attaching a joint to the end of the protective steel plates 4, 35, As shown in FIGS. 4C, 4 </ b> D, and 5 </ b> G, notches 37 are formed in the plates 18 of the holder portions 16, 22, and 30. Further, a notch 38 for passing the PC steel rod 14 is formed in the plate 18 of the holder parts 16, 22, 30. In addition, a slit 39 for allowing the wire saw 8 to pass therethrough is provided in the plate 18 of the holder portions 16 and 30 in the range through which the wire saw 8 passes. Further, a slit 40 for changing the direction of the wire saw 8 is provided in the pipe 33 between the front holder portion 16 of the pulley support mechanisms 6a and 6b and the rear holder portion 30 of the auxiliary pulley support mechanisms 28a and 28b. ing.

  The ground is cut by the ground cutting device as described above, and the protective steel plate 4 is inserted into the ground. That is, the wire saw 8 circulates by driving the driving pulley 10 shown in FIG. 1 and is pulled to the reach shaft 3 side at the same time. By circulating and pulling the wire saw 8, the peripheral walls of the guide tubes 5a and 5b are cut into a slit shape in the tube axis direction, and the ground between the guide tubes 5a and 5b is cut into a slit shape. With the cutting of the natural ground, the protective steel plate 4 is pulled by the pulling of the PC steel rod 14, and the protective steel plate 4 is inserted into the cutting portion by the wire saw 8.

  At the time of such natural ground cutting and the accompanying insertion of the protective steel plate 4 into the natural ground, the pulley support mechanisms 6a and 6b, the clamp mechanisms 7a and 7b, and the auxiliary pulley support mechanisms 28a and 28b are all guide tubes 5a and 5b. It moves by the traveling of the traveling roller 19 that is in contact with the inner peripheral surface. For this reason, it is not necessary to install guide rails inside the guide pipes 5a and 5b, and the work efficiency and the construction period can be shortened.

  In addition, since each mechanism is accurately positioned by the traveling roller 19 in contact with the inner peripheral surfaces of the guide tubes 5a and 5b, it is possible to improve the accuracy of ground cutting and thus the installation accuracy of the protective steel plate. Furthermore, by changing the mounting position of the traveling roller 19, it is possible to correspond to guide tubes of various diameters or to be eccentric with respect to the guide tubes.

  Furthermore, since the pulley support mechanisms 6a and 6b are separated from the clamp mechanisms 7a and 7b and are accommodated in the guide tubes 5a and 5b, the traction force acting on the wire saw 8 acts only on the pulley support mechanisms 6a and 6b. For this reason, an excessive force is not applied to the wire saw 8. In addition, when the wire saw 8 is cut, only the pulley support mechanisms 6a and 6b have to be recovered, so that the restoration work can be easily performed.

  FIG. 6 is a plan view showing another embodiment. In the above embodiment, the pulley support mechanisms 6a and 6b are separated from the clamp mechanisms 7a and 7b and are accommodated in the guide tubes 5a and 5b. By adopting such a configuration, there are advantages as described above. That is, since the wire saw 8 is wound in two stages between the pulley support mechanisms 6a and 6b, a force for pulling the pulley support mechanisms 6a and 6b acts on the pulley support mechanisms 6a and 6b due to the tension. As a result, the pulley support mechanisms 6a and 6b are subjected to a force to rotate in the circumferential direction in the guide tubes 5a and 5b, and a gap is generated between the ground groove cut by the wire saw 8 and the protective steel plate 4. End up.

  Therefore, in this embodiment, means for preventing rotation of the pulley support mechanisms 6a and 6b is provided. This means is capable of separating the rear holder portion 16 of the pulley support mechanisms 6a and 6b and the front holder portion 22 of the clamp mechanisms 7a and 7b in the tube axis direction of the guide tubes 5a and 5b, and the pulley support mechanism 6a. , 6b are connected so as to prevent rotation. This connecting means employs the following structure in this embodiment.

That is, two rods 50 extending in the tube axis direction of the guide tubes 5a and 5b are provided on the rear surfaces of the rear holder portions 16 of the pulley support mechanisms 6a and 6b. On the other hand, the front holder part 22 of the clamp mechanisms 7a and 7b is provided with holes 51 corresponding to the rods 50 in each of the pair of plates 18 and 18 constituting the holder part 22. The rod 50 is fitted in the hole 51 so as to be movable in the tube axis direction.

  In such a structure, the clamp mechanisms 7a and 7b clamp the protective steel plate 4, and therefore cannot rotate in the circumferential direction of the guide tubes 5a and 5b. Since the pulley support mechanisms 6a and 6b are connected to the non-rotatable clamp mechanisms 7a and 7b via the rod 50, they cannot rotate (FIG. 6A). Further, since the rod 50 is movably fitted in the hole 51, the traction force acting on the wire saw 8 acts only on the pulley support mechanisms 6a and 6b, and an unreasonable force is exerted on the wire saw 8 as in the above embodiment. Will not take.

  Further, the rod 50 can be pulled out from the hole 51, and therefore the pulley support mechanisms 6a and 6b can be separated from the clamp mechanisms 7a and 7b (FIG. 6B). Thereby, like the said embodiment, when the wire saw 8 cuts out by any chance, only the pulley support mechanisms 6a and 6b can be collect | recovered.

  In contrast to the embodiment shown in FIG. 6, the rod 50 is provided in the front holder portion 22 of the clamp mechanisms 7a and 7b, and the hole 51 is provided in the rear holder portion 16 of the pulley support mechanisms 6a and 6b. Also good. Further, the number of rods 50 is not limited to two, and may be one or three or more.

  The above embodiment is merely an example, and the present invention can take various forms. For example, in the above embodiment, a roller is shown as the traveling member, but a warp can be used. Moreover, the aspect which used the traveling member and the rail together can be taken irrespective of the traveling member.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole schematic diagram which shows embodiment, (a) is horizontal direction sectional drawing, (b) is vertical direction sectional drawing. It is a top view which shows the detail of embodiment. It is a side view which shows the detail of embodiment. (A)-(D) is an AA line-DD line arrow sectional view of Drawing 3, respectively. (E)-(H) are the EE line-HH arrow directional cross-sectional views of FIG. 3, respectively. It is a top view which shows another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling path 2 Starting shaft 3 Reaching shaft 4 Protective steel plate 5a, 5b Guide pipe 6a, 6b Pulley support mechanism 7a, 7b Clamp mechanism 8 Wire saw 11a, 11b Cutting pulley 13 Pull jack 14 PC steel bar 15 Support portion 16 Holder portion 19 Traveling roller 21 Clamp part 22 Holder part 28a, 28b Auxiliary pulley support mechanism 29 Support part 30 Holder part 31 Plate 32 Auxiliary pulley

Claims (5)

Pulley support mechanisms for supporting the cutting pulleys, which are respectively accommodated in a pair of guide pipes installed horizontally in the ground and movably in the pipe axis direction, and the cutting pulleys supported by these pulley support mechanisms A flexible cutting tool, such as a wire saw, wound around the ground between the guide tubes, and a cutting tool accommodated in the guide tube so as to be movable in the axial direction behind the pulley support mechanism. A ground cutting device provided with a clamp mechanism for clamping both sides of the tip of the protective plate inserted into the cutting portion of the ground cut by
The pulley supporting mechanism and the clamping mechanism, each have a holder portion that is disposed perpendicular to the tube axis at its front and rear, a plurality of traveling in contact with the inner peripheral surface of the guide tube to the outer periphery of each of the holder portions Traveling members are provided at intervals in the circumferential direction ,
The rear holder part of the pulley support mechanism and the front holder part of the clamp mechanism are capable of separating both holder parts in the tube axis direction of the guide tube and prevent circumferential rotation of the guide tube of the pulley support mechanism. A ground cutting device characterized by being connected by a connecting means .   2. The ground cutting apparatus according to claim 1, wherein a tension member for pulling the protection plate is connected to the clamp mechanism.   The connecting means includes a rod provided in one of the rear holder of the pulley support mechanism and the front holder of the clamp mechanism in the tube axis direction, and the other of the rear holder of the pulley support mechanism and the front holder of the clamp mechanism. The ground cutting device according to claim 1, wherein the rod is provided with a hole in which the rod is movably fitted in the tube axis direction. The cutting tool is wound endlessly through the inside of each guide tube between a drive pulley installed outside the guide tube and the pulley for cutting,
An auxiliary pulley support mechanism for supporting an auxiliary pulley that is housed in front of the pulley support mechanism in each guide tube so as to be movable in the direction of the pipe axis and prevents sagging of the cutting tool;
The auxiliary pulley support mechanism has holder portions arranged at right and left portions of the auxiliary pulley support mechanism at right angles to the tube axis, and a plurality of traveling members that run in contact with the inner peripheral surface of the guide tube are arranged around the outer periphery of each holder portion. The ground cutting device according to any one of 1 to 3, wherein the ground cutting device is provided at intervals in the direction.   The ground travel cutting device according to claim 1, wherein the traveling member is a roller.

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