JP5535577B2 - Cutting method with wire saw - Google Patents

Description

  The present invention relates to a cutting method using a wire saw, in which an expansion joint portion on, for example, an elevated road or a bridge is partially cut using a wire saw.

  Thus, as a cutting method for cutting an expansion joint portion of an elevated road or a bridge using a wire saw, for example, in Patent Documents 1 to 6, the surface of an object to be cut such as a road surface of the road, A groove is formed so as to surround the expansion joint portion, a wire saw is disposed in the groove, and a cutting device having a motor and a pulley is used to travel around the groove, A cutting method is described in which the surface of the object to be cut including the expansion joint portion is partially cut by being drawn horizontally inside the surface to be cut so as to be parallel to the surface to be cut. Yes.

JP 2003-27420 A JP 2006-161391 A JP 2006-299753 A Japanese Patent No. 3968380 JP 2008-114469 A JP 2008-285809 A

  By the way, in the cutting method by the wire saw described in these Patent Documents 1 to 6, a groove for arranging and traveling the wire saw is formed so as to have a cross-sectional "U" shape opening on the road surface side, For example, in Patent Documents 1 to 3, it is possible to form such a groove by forming a plurality of slits on the road surface with a load cutter and then removing the portions between these slits by crushing them with a chisel or an electric chopper. Have been described. However, in such a method, it takes a lot of time and labor to pulverize and remove the road surface between the slits, and many slits are formed when trying to crush the road surface more finely in order to reduce the labor. As a result, the time required to form the groove is prolonged. Furthermore, noise when the road surface is crushed finely becomes a problem.

  On the other hand, Patent Documents 4 to 6 describe that such a groove is formed in a necessary width by a load cutter in which a plurality of rotating blades are overlapped. However, with such a method, although labor is reduced, the power required for driving the cutter increases and the resistance acting on the load cutter increases remarkably, so the feeding speed of the cutter cannot be increased. It is inevitable that the time required for forming the groove becomes long. Moreover, because the wear situation differs between the blades located on both sides of the blades and the blades located between them, the blades must be replaced as necessary, resulting in a further loss of work efficiency. It becomes.

  The present invention has been made under such a background, and when a surface of an object to be cut is partially cut using a wire saw as described above, a groove can be formed easily and in a short time. Therefore, it aims at providing the cutting method by the wire saw which can perform an efficient cutting operation.

In order to solve the above problems and achieve such an object, the present invention forms a groove along the cut portion on the surface of the object to be cut, and arranges a wire saw in the groove. while traveling by making cut on the inside of the object to be cut portion so as to parallel to the surface of the object to be cut, a cutting method by a wire saw for cutting a surface of the object to be cut partially, two A slit is formed on the surface of the object to be cut so as to intersect the groove bottom side of the groove, and thus the groove is formed in a V-shaped cross section by taking out a portion sandwiched between the two slits. And

  In such a cutting method, when forming a groove in which a wire saw is to be formed, two slits are formed on the surface of an object to be cut so as to intersect on the groove bottom side with a load cutter using a rotating blade. Thus, the groove having the V-shaped cross section as described above can be formed by simply taking out the portion sandwiched between the two slits. Therefore, it is only necessary to form two slits respectively, and it is not necessary to pulverize and remove the portion sandwiched between the slits with a chisel or an electric chopper, thus reducing both the time, labor and noise required for the work. Can do. Further, the rotating blade is not biased and worn.

  Here, the groove has a V-shaped cross section in which the groove wall surface formed by the two slits has a bisector perpendicular to the surface of the workpiece, or a groove perpendicular to the surface of the workpiece. It may have a V-shaped cross section formed by a wall surface and a groove wall surface inclined to the opposite side of the groove wall surface with respect to the groove wall surface. When an inclined groove wall surface is formed, the rotating blade and the load cutter for forming the slit must be inclined to the opposite side to the part to be cut.

  However, when the object to be cut is an expansion joint of an elevated road or a bridge as described above, the rotating blade or the load cutter inclined to the opposite side of the cut part thus interferes with the side wall of the elevated / bridge. Or it may stick out on the opposite lane side of the road. Therefore, in such a case, the groove has a V-shaped cross section by a groove wall surface perpendicular to the surface of the object to be cut and a groove wall surface inclined to the cut portion side with respect to the groove wall surface. It is desirable to form.

  In addition, if the narrow angle of the groove having the V-shaped cross section is too small in this way, the slit must be formed deeper in order to ensure a sufficient width behind the portion to be cut to arrange the wire saw. On the other hand, if the angle between the grooves is too large, especially when the groove wall surface inclined toward the part to be cut is formed as described above, the wire saw is cut into the inside of the part to be cut. There is a risk that the wire saw may move to the surface side of the workpiece. For this reason, it is desirable to form the groove in a V-shaped cross section within a range of 15 ° to 20 °.

  As described above, according to the present invention, when a surface of an object to be cut is partially cut using a wire saw, a groove for disposing the wire saw can be formed easily and in a short time. Thus, it becomes possible to promote the efficiency of the cutting work on the surface of the workpiece.

It is the front view seen from the joint width direction of expansion joint C explaining one embodiment of the present invention. It is a top view explaining one Embodiment of this invention. It is the side view seen from the joint extension direction of the expansion joint C explaining one Embodiment of this invention. It is another top view explaining one Embodiment of this invention. In one embodiment of the present invention, (a) when forming the groove H, (a) when forming the groove wall surface H1 perpendicular to the road surface B, (b) when forming the groove wall surface H2 inclined with respect to the road surface B. FIG.

  FIGS. 1 to 0 illustrate an embodiment of a cutting method using a wire saw according to the present invention, and show a case where the present invention is applied to the cutting of an expansion joint such as an elevated road or a bridge. It is. That is, in the present embodiment, the object to be cut is an elevated road frame A, the surface of the object to be cut is the road surface B, and the cut part includes the expansion joint C on the road surface B side of the frame A. Part. In the figure, reference numeral D indicates the side wall of the elevated road, and reference numeral E indicates the opposite lane side of the lane in which the expansion joint C to be cut of the elevated road is embedded.

  Thus, in order to cut the portion including the expansion joint C from the road surface B of the frame A such as an elevated road, a wire saw cutting device as shown in FIGS. 1 to 3 is used. This wire saw cutting device 1 has a gate shape and is perpendicular to the road surface B and extends in the direction in which the expansion joint C extends (width direction of an elevated road or the like; left and right direction in FIGS. 1 and 2; hereinafter referred to as a joint extending direction). .) Is also provided on the main body 2 which is installed so as to be vertical.

  The rotation drive device 3 includes a plurality of (two in the present embodiment) pulleys 4 that are rotatable in the same plane with their rotation axes horizontal and parallel to the joint extending direction. It is attached so that it can be raised and lowered. Furthermore, one of these pulleys 4 has a larger diameter than the other pulleys 4 and is a drive pulley 4A that is connected to the rotary drive device 3 and is driven to rotate.

  In addition, a plurality of (three in the present embodiment) pulleys 5 whose rotational axes are rotatable in the same plane with the rotational axes parallel to the rotational axes of the pulleys 4 of the rotation driving device 3 are also provided at the lower part of the main body 2. As shown in FIG. 3, when viewed from the joint extending direction, the pulley 4 and the zigzag shape face the width direction of the expansion joint C (vertical direction in FIG. 2, horizontal direction in FIG. 3, hereinafter referred to as joint width direction). It arrange | positions so that this arrangement | positioning may be made. However, the rotation axis of these pulleys 5 is fixed to the main body 2.

  Furthermore, among these pulleys 4 and 5, pulleys located at both ends in the joint width direction (in this embodiment, the drive pulley 4A and the pulley 5 located on the opposite side of the drive pulley 4A in the joint width direction). The pulley 6 that is rotatable about a horizontal rotation axis is held by a bracket 7 that is rotatable about a vertical axis so that the pulley 6 is positioned below the main body 2. It is installed. These brackets 7 are rotatable around a vertical axis that is in contact with the outer peripheral groove of the drive pulley 4A and the pulley 5 on the opposite side to the joint width direction on the outer side in the joint width direction. The outer circumferential groove is disposed so as to be in contact with the vertical axis.

  In order to perform cutting with such a wire saw cutting device 1, first, as shown in FIG. 2, a rectangular portion to be cut with the joint extending direction as a longitudinal direction so as to surround the expansion joint C in plan view is formed. It is set on the road surface B, and a reinforcing bar search hole F is formed at each corner of the rectangle by a core bit or the like, and the pulley 6 and the bracket 7 of the wire saw cutting device 1 are disposed near the center of the long side of the rectangle. Two accommodation holes G each having a size that can be accommodated are formed by a core bit or the like at intervals of one long side.

  Further, after the grooves H are formed along the respective sides of the rectangle by a load cutter or the like, the pulley 6 and the bracket 7 are respectively accommodated in a pair of accommodation holes G that are opposed to each other of the pair of long sides. Then, the wire saw cutting device 1 is installed on the road surface B so as to cross the expansion joint C in the joint width direction. The reinforcing bar exploration hole F, the accommodation hole G, and the groove H are formed from the road surface B to a position deeper than the expansion joint C.

  Next, the wire saw 8 is passed through the groove H from the pulley 6 accommodated in one of the pair of accommodation holes G, and on one long side, the short side, and the other long side of the rectangle. The pulleys 4, 5 provided in the main body 2 of the wire saw cutting device 1 and the rotary drive device 3 are extended from the pulley 6 accommodated in the other accommodation hole G. 3 and the driving pulley 4A are sequentially wound as shown in FIG. 3, and are arranged endlessly so as to reach the pulley 6 of the one receiving hole G again.

  Then, the wire saw 8 is caused to travel along the arrangement path via the rotation pulley 4A by the rotation drive device 3, and the rotation drive device 3 is lifted to cut the inside of the rectangle. The cut portion including the expansion joint C is cut in parallel to the road surface B to the position of the pair of accommodation holes G in the joint extending direction. At this time, the wire saw 8 is cut so that the angle between the pair of long sides changes in a plan view as shown in FIG. 2, but the bracket 7 rotates in the wire saw cutting apparatus 1. Follow the change of the lever angle.

  When the cut portion is cut up to the pair of receiving holes G in this way, the pulley 6 and the bracket 7 at both ends of the joint width direction are then moved to the other pair of receiving holes G facing the pair of long sides of the rectangle. As shown in FIG. 4, the wire saw cutting device 1 is re-installed so as to be accommodated, and the wire saw 8 is opposite to the previously cut portion from the other pair of accommodation holes G. It arrange | positions in the groove | channel H along the long and short side of a side, and makes the wire saw 8 cut inside this rectangle, making it run around like the above.

  Here, when the pulley 6 and the bracket 7 are accommodated and cut in the pair of accommodation holes G, and then the pulley 6 and the bracket 7 are accommodated and cut in the other pair of accommodation holes G. The portion to be cut is such that the accommodation holes G overlap with each other in the joint extending direction, so that the portion to be cut including the expansion joint C surrounded by the rectangle is a part from the road surface B of the casing A. Disconnected. Furthermore, the part to be cut thus cut is removed by a crane or the like. Since the wire saw 8 cut into the part to be cut in this way becomes high temperature, the wire saw 8 is cooled by a cooling device (not shown) using, for example, a vortex tube in the wire saw cutting apparatus 1 of the present embodiment. Thus, an anhydrous cutting operation is possible without using cooling water.

  And in this cutting method using the wire saw 8, in this embodiment, when forming the groove H of the part to be cut, the groove H is formed in a V-shaped cross section as shown in FIG. ing. In FIG. 1, only the grooves H along the pair of short sides of the rectangle are illustrated, but in this embodiment, all of the rectangles that set the cut portion including the grooves H along the pair of long sides are illustrated. The groove H has a V-shaped cross section over the circumference.

  Here, the cross-section V-shaped formed by the groove H is composed of a pair of planar groove wall surfaces that approach and intersect each other toward the groove bottom side of the groove H. In the present embodiment, It is formed by a groove wall surface H1 perpendicular to the road surface B, which is the surface, and a groove wall surface H2 inclined toward the cut portion with respect to the groove wall surface H1. Further, the crossing angle between the groove wall surfaces H1 and H2, that is, the V-shaped included angle formed by the cross section of the groove H is a constant value within a range of 15 ° to 20 °.

  In order to form such a groove H having a V-shaped cross section, for example, in the load cutter 11 for forming the groove H as shown in FIG. 6A, first, the rotation axis of the rotary blade 12 is made horizontal. The slit is formed so that the groove wall surface H1 perpendicular to the road surface B is formed, and then the load cutter 11 is inclined so that the rotation axis of the rotary blade 12 is directed toward the road surface B as it goes to the inside of the cut portion. Thus, the slit may be formed so that the groove wall surface H2 inclined toward the cut portion side with respect to the groove wall surface H1 is formed. Needless to say, the groove wall surface 1 may be formed after the groove wall surface H2 is formed, or the groove wall surfaces H1 and H2 may be formed in a different order for each groove H by the plurality of load cutters 11.

  Therefore, in such a cutting method using the wire saw 8, if two slits are formed to form the groove H in this way, the portion sandwiched between these two slits can be taken out from the road surface B as it is, This part does not need to be finely crushed and removed with a chisel or an electric chopper as in the prior art, and the time, labor, and noise required for the operation of forming the groove H can be greatly reduced. Further, the rotating blade 12 of the load cutter 11 is not worn unevenly. For this reason, it becomes possible to perform efficiently the operation | work which cuts the to-be-cut | disconnected part containing the expansion joint C from the road surfaces B, such as an elevated road, with the wire saw 8 as mentioned above.

  Further, in this embodiment, the groove H having the V-shaped cross section is constituted by the groove wall surface H1 perpendicular to the road surface B and the groove wall surface H2 inclined to the cut portion side with respect to the groove wall surface H1. When the inclined groove wall surface H2 is formed, the load cutter 11 and the rotating blade 12 do not protrude outside the portion to be cut. Therefore, when the cut portion including the expansion joint C is cut from the road surface B of the elevated road as in this embodiment, the load cutter 11 and the rotating blade 12 interfere with the side wall D of the road, or the cutting work It is possible to prevent a situation in which the traveling of the automobile in the opposite lane has to be restricted by protruding into the opposite lane of the lane where the vehicle is to be performed.

  However, in particular, when the groove H is formed in a V-shaped cross section by the groove wall surface H1 perpendicular to the road surface B and the groove wall surface H2 inclined to the cut portion side with respect to the groove wall surface H1, If the included angle formed by the V-shape is too large, the wire saw 8 disposed in the groove H may be displaced when being cut. Further, if the included angle is large, the V-shaped cross-sectional area also increases, and the road surface B must be removed more than necessary. On the other hand, if the V-shaped sandwich angle is too small, in order to secure a sufficient width behind the cut portion of the groove H to arrange the wire saw 8, the housing A is cut deeper. Since the groove H must be formed, it is desirable to form this included angle within a range of 15 ° to 20 ° as in this embodiment.

DESCRIPTION OF SYMBOLS 1 Wire saw cutting device 2 Body of wire saw cutting device 1 3 Rotation drive device 4, 5, 6 Pulley 4A Drive pulley 7 Bracket 8 Wire saw 11 Road cutter 12 Rotating blade A Housing B Road surface C Expansion joint D Side wall E Opposite lane F Reinforcing bar exploration hole G accommodation hole H groove H1 groove wall surface perpendicular to road surface B H2 groove wall surface inclined with respect to road surface B

Claims (3)

A groove is formed on the surface of the object to be cut along the part to be cut, and a wire saw is disposed in the groove so as to run while being parallel to the surface of the object to be cut. A method of cutting with a wire saw that partially cuts the surface of the workpiece by cutting, and forming two slits on the surface of the workpiece so as to intersect at the groove bottom side of the groove Then, by taking out the portion sandwiched between the two slits in this way, the groove is formed in a V-shaped cross section, and a cutting method using a wire saw.   The groove is formed in a V-shaped cross section by a groove wall surface perpendicular to the surface of the object to be cut and a groove wall surface inclined toward the cut portion with respect to the groove wall surface. A cutting method using the wire saw according to 1.   The cutting method using a wire saw according to claim 1 or 2, wherein the groove is formed in a V-shaped cross section within a range of a sandwich angle of 15 ° to 20 °.

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