JP2007046291A - Method of cutting and removing part of surface of structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of cutting and removing part of a surface of a structure, which does not cause noise nor environmental problems, and achieves cutting with high efficiency. <P>SOLUTION: The method of cutting and removing part of the surface of the structure is comprised of: a step of forming countersunk holes in the vicinity of each intersection point of cutting scheduled lines drawn on the surface of the structure; a step of arranging guide pulleys in the countersunk holes and forming first cut slits by a first wire saw; a step of arranging direction converting pulleys in the countersunk holes, and arranging a second wire saw having a bead diameter smaller than that of the first wire saw, in a bottom of each first cut slit and the direction converting pulley, followed by cutting the structure almost in parallel with the surface of the structure to form second cut slits. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutting method for removing a part of a surface of a concrete structure or the like, and more particularly, to a cutting method for removing a steel expansion joint provided at a joint portion of a viaduct or a bridge in order to replace it. .

  Steel joints are provided at the joints of structures such as viaducts and bridges to absorb expansion and contraction due to temperature changes, vibration, deflection, and the like. An example of the structure of the expansion joint is shown in FIG. In the expansion joint 30, a steel joint body 33 is fixed on a floor slab 35 at the end of a girder 36, and a steel plate 32 serving as a joint is provided on the joint body 33. This joint is comb-shaped on one side, and is provided so that the comb-shaped portions of the two joints engage with each other.

  This expansion joint is subjected to a load or an impact due to traveling of the vehicle, and this causes a step or damage. Therefore, in recent years, not a steel expansion joint but a sheet-buried expansion joint has begun to be used. As shown in FIG. 4, the sheet-embedded expansion joint has a support metal plate 41 attached to the ends of the girders 46 on both sides of a joint such as a viaduct, and a sheet-like reinforcing fiber composite material 42 is fixed on the support metal plate 41. In addition, a resin layer 43 or the like is provided thereon so as to be flush with the viaduct pavement surface 44. (For example, see Patent Document 1)

  On the other hand, when a level difference or damage occurs when using a conventional steel expansion joint, it is replaced with the above-mentioned sheet-embedded expansion joint, but it is necessary to remove the existing expansion joint. There was a method in which the floor slab concrete around the expansion joint was suspended with a concrete breaker, and the expansion joint was cut with gas and removed. However, this method is not only very inefficient in work, but also has problems that the concrete breaker does not work at night due to noise problems due to the suspension work, and that it is not preferable in terms of the environment because dust is scattered. there were.

To solve this problem, as shown in FIG. 5, grooves 24 are provided on both sides of the expansion joint 20 along the longitudinal direction of the existing expansion joint 20, and at least one slit crossing between the grooves 24a and 24b is provided. There has been proposed a cutting method in which the wire saw 2 for cutting is disposed at the bottom of the groove 24 and the bottom of the slit, the cutting is performed in the horizontal direction, and the upper portion of the expansion joint 20 is partially removed. . This cutting method includes a moving means 8 movable in the longitudinal direction of the expansion joint 20, a drive pulley 5, at least a pair of direction changing pulleys 12a, and a pair of shafts rotatably supported on a plane substantially parallel to the road surface. The cutting device 1 including the guide pulley 12b, the tension adjusting means of the wire saw 2, and the driving means 6 of the driving pulley 5 is installed on the road surface of the expansion joint 20, and as described above, on both sides of the expansion joint 20 in advance. The wire saw 2 is arranged in the slit that crosses between the groove 24 provided and the wire saw 2 is hung on each pulley of the cutting device 1, and the cutting device 1 is moved on the guide rail 7 by the moving means 8. However, the wire saw 2 is moved and cut in a state where a certain tension is applied. (For example, see Patent Document 2)
JP-A-10-298908 JP 2003-27420 A

  However, even in the method of Patent Document 2, in order to provide grooves on both sides of the expansion joint along the longitudinal direction of the existing expansion joint, a plurality of cutting stripes are provided by a disk-shaped road cutter, It is necessary to crush the pavement material between the cutting bars with a chisel or an electric chipper to form grooves. Further, it is necessary to form the groove bottom surface, and it takes much time to form the groove. For this reason, the present invention eliminates noise and environmental problems when removing a part of the surface of a structure, such as partially removing a steel expansion joint provided at a joint such as a viaduct or a bridge. It is an object of the present invention to provide a method with few problems and capable of performing cutting with high efficiency.

A feature of the cutting method for removing a part of the structure surface of the present invention is a cutting method for removing a part of the structure surface,
Providing a counterbore around each intersection of a first scheduled cutting line that cuts in a direction substantially perpendicular to the surface of the structure;
Disposing a guide pulley in the counterbore,
Disposing a first wire saw on the guide pulley, the first scheduled cutting line and the cutting device;
Cutting the inner surface from the surface of the structure while running the first wire saw to form a first cutting line;
Disposing a direction change pulley in at least two of the counterbore holes;
Placing a second wire saw having a smaller bead diameter than the first wire saw in the first cutting bar, the direction changing pulley and the cutting device;
Cutting the second wire saw in a direction substantially parallel to the surface of the structure while running the second wire saw to form a second cutting line.

  In the cutting method of the present invention, a cutting line is formed according to the first scheduled cutting line in order to remove a part of the surface of the structure. The first scheduled cutting line is preferably polygonal, and counterbore holes are formed in advance at the corners of the first scheduled cutting line. And a guide pulley is arrange | positioned in this counterbore hole, a 1st cutting | segmentation line | wire is formed by arrange | positioning and making it drive | work on a guide pulley, a 1st scheduled cutting line, and a cutting device. This 1st cutting streak cuts for every line which forms a polygon, and forms the 1st cutting streak in a polygon shape. Next, a direction change pulley is disposed in the counterbore, and a second wire saw having a bead diameter smaller than that of the first wire saw is disposed at a predetermined depth inside the first cutting bar. The surface of the structure is partially cut by forming a second cutting line in a direction substantially parallel to the surface of the structure.

  If cutting is performed in such a process, it can be performed mainly by drilling tools such as core drills and wire saws, and cutting with a road cutter or the like is unnecessary, so the time and equipment for arranging the cutting device Can be reduced and work can be done efficiently. In addition, a wire saw having a diameter smaller than that of the wire saw used for cutting in the vertical direction is used for cutting in a direction substantially parallel to the surface of the structure. Therefore, it is easy to use the wire saw as the first cutting line composed of a narrow kerf. Furthermore, since the specification can be different from that of the first wire saw, it is possible to make the specification suitable for each cutting, and efficient cutting becomes possible. Further, when forming the second cutting streak, it is possible to cut in the horizontal direction only by changing the guide pulley to the direction change pulley without changing the placement of the cutting device disposed when forming the first cutting streak. This makes it possible to reduce the setup time for the cutting operation. As described above, by shortening the working time in each process, it is possible to significantly shorten the construction period compared to the conventional construction method.

  This cutting method is suitably used for removing existing expansion joints provided at the joints of road structures such as viaducts and bridges.

  According to the cutting method for removing a part of the surface of the structure of the present invention, since it can be performed by cutting mainly a core drill and a wire saw, a large-sized device such as a road cutter becomes unnecessary, and work setup is also possible. Since it is simplified and can be cut efficiently, the construction period can be greatly shortened.

  An embodiment of the present invention will be described in detail with reference to the drawings, taking as an example a partial cutting method for an expansion joint existing on a road.

  FIG. 1 is a schematic view showing an example of performing partial cutting of an existing expansion joint by the cutting method of the present invention. In the partial cutting of the existing expansion joint, a part of the expansion joint is cut into a quadrangular prism shape, and this cutting method will be described step by step. In addition, in FIG. 1, although the attachment state of the cutting device in the case of forming the 1st cutting streak and the 2nd cutting streak is collectively described, it is not necessarily performed simultaneously, You may carry out in the procedure of forming a 2nd cutting streak after forming a 1st cutting streak.

  FIG. 2 is a plan view and a cross-sectional view showing a state around the expansion joint before cutting with a wire saw. With reference to FIGS. 1 and 2, first, scheduled cutting lines 31a, 31b, 31c, 31d for forming first cutting bars 21a, 21b, 21c, 21d around the expansion joint 30 are determined. These scheduled cutting lines are polygons (rectangles in this example) formed by combining straight lines, and have intersections of the lines constituting the scheduled cutting lines. Next, a counterbore 23 centered around the intersection is formed using a core drill. The counterbore 23 is formed by forming a circular groove with a core drill and removing the core inside the circular groove by a method such as hanging. Thereafter, in order to make the bottom of the counterbore 23 smooth, if necessary, polishing is performed with a rough polishing tool and the counterbore 23 is formed.

  As shown in FIG. 1, the wire saw cutting apparatus 1 is provided with a support 3 integrally provided on a base 4 and a drive pulley 5 attached so as to be movable along the support 3. The drive pulley 5 is provided with a drive unit 6 such as a motor and is rotatable. A stay 13 for attaching the guide pulley 11 is fixed to the column 3 with a bolt or the like, and a plurality of guide pulleys 11 a and 11 b are attached to the stay 13.

  Said cutting device 1 is fixed to the surface 20a of the existing expansion joint which is a structure. As the fixing method, for example, the base 4 is fixed to the surface 20a of the existing expansion joint via an anchor bolt or the like. Next, as shown on the right side of FIG. 1, guide pulleys 15 are installed in counterbore holes 23 at both ends of the line to be cut. The guide pulley 15 is installed so that the circular surface of the guide pulley 15 is parallel to the cutting surface formed by the first cutting bar 21 and perpendicular to the surface 20a of the existing expansion joint. It is installed so that the lowermost end is located on the extension line of the bottom portion of the first cutting bar 21.

  The first wire saw 2a is wound around the drive pulley 5, the guide pulleys 11 and 15 of the cutting apparatus 1 installed as described above, and the planned cutting line, and the drive pulley 5 is moved upward to move the first wire. While applying tension to the saw 2a, the drive pulley 5 is rotated to run the first wire saw 2a. By doing so, the wire saw 2a is gradually cut downward from the planned cutting line, and the first cutting streaks 21a are formed.

  Next, the attachment positions of the cutting device 1 and the guide pulley 15 are changed, and other first cutting bars 21b, 21c, and 21d are also formed in the same manner. In the case of this example, it is preferable that 21b and 21d of the first cut bars are formed first, and then 21a and 21c are formed. This is because if the cutting is performed in this order, the cutting apparatus 1 can perform the cutting for forming the second cutting streak 22 as it is after the first cutting streaks 21a or 21c are formed. .

  When the formation of the first cutting bars 21a, 21b, 21c, and 21d is completed, the guide pulley 15 installed in the counterbore 23 is removed and the direction changing pulley 12 is attached, as shown on the left side of FIG. This direction change pulley 12 has two pulleys 12a and 12b, and can change the traveling direction of the wire saw into two different directions. The pulley 12a is installed so that the circular surface is parallel to the cutting surface formed by the first cutting bar 21a, and the lowermost end of the outer peripheral part is located on the extension line of the bottom part of the first cutting bar 21. Install as follows. The pulley 12b is installed so that the circular surface is parallel to the surface 20a of the existing expansion joint and is located on the extension line of the bottom portion of the first cutting bar 21.

  The second wire saw 2b is wound around the driving pulley 5, the guide pulley 11, the direction changing pulley 12, and the cutting bars 21b, 21c, and 21d of the cutting apparatus 1 installed as described above, and driven. The pulley 5 is moved upward to apply tension to the second wire saw 2b, and the drive pulley 5 is rotated to run the second wire saw 2b. By doing in this way, the wire saw 2b is gradually cut | disconnected in the horizontal direction from the part of the 1st cutting bar | burr 21c, and the 2nd cutting bar | burr 22 is formed. The second wire saw 2b is a wire saw having a smaller bead diameter than the first wire saw 2a. By doing in this way, the 2nd wire saw 2b can be easily installed in the inside of the 1st cutting bar | burr 21. FIG. When the second cutting bar 22 is completely formed, a part of the existing expansion joint is cut into a quadrangular prism shape.

  In the above, the present invention has been described by taking as an example partial cutting of an existing expansion joint on a road. However, the present invention is not limited to the above-described embodiment, and is applicable to cutting of other structures. Is also included.

  In the cutting method of the present invention, the steel expansion joint provided at the joint portion of the viaduct or bridge is cut to remove the steel expansion joint for replacement, and the surface of a concrete structure or the like is removed. It can be used for cutting to remove the part.

It is the schematic which shows the cutting method which removes a part of structure surface of this invention. It is a figure which shows the state before the cutting | disconnection by a wire saw with the cutting method of this invention, (a) is a top view, (b) is AA sectional drawing of (a). It is a figure which shows the example of the conventional expansion joint part, (a) is a top view, (b) is BB sectional drawing of (a). It is a fragmentary sectional view showing the outline of the sheet embedding type expansion joint part. It is the schematic which shows the method of partially cutting the conventional existing expansion joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting device 2 Wire saw 2a 1st wire saw 2b 2nd wire saw 3 Support | pillar 4 Base 5 Drive pulley 6 Drive part 7 Guide rail 8 Moving means 11 Guide pulley 12 Direction change pulley 13 Stay 14 Direction change pulley stay 15 Guide pulley 20 Existing expansion joint 20a Existing expansion joint surface 21 First cutting bar 22 Second cutting bar 23 Counterbore 24 Groove 30 Expansion joint 31 Planned cutting lines 31a, 31b, 31c, 31d Planned cutting line 32 Steel plate 33 Joint body 34 Road surface 35 Floor slab 36 Girder 40 Sheet embedded expansion joint 41 Support metal plate 42 Sheet-like reinforcing fiber composite material 43 Resin layer 44 Road surface 46 Girder

Claims (3)

A cutting method for removing a part of the surface of a structure,
Providing a counterbore around each intersection of a first scheduled cutting line that cuts in a direction substantially perpendicular to the surface of the structure;
Disposing a guide pulley in the counterbore,
Disposing a first wire saw on the guide pulley, the first scheduled cutting line and the cutting device;
Cutting the inner surface from the surface of the structure while running the first wire saw to form a first cutting line;
Disposing a direction change pulley in at least two of the counterbore holes;
Placing a second wire saw having a smaller bead diameter than the first wire saw in the first cutting bar, the direction changing pulley and the cutting device;
A cutting method of removing a part of the surface of the structure including a step of cutting the second wire saw in a direction substantially parallel to the surface of the structure while running the second wire saw to form a second cutting line.   The cutting method for removing a part of the surface of the structure according to claim 1, wherein the first scheduled cutting line is a polygon.   The cutting method for removing a part of the surface of the structure according to claim 1 or 2, wherein the structure is an expansion joint existing on a road.

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