JP2018178444A - Cutting method and removal method of object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting method of an object capable of making a cut suitably in an object, and a removal method and the like of the object using the cutting method.SOLUTION: An end part 11 in the longer direction of a blade 1 expands in a substantially T-shaped manner with respect to an intermediate part in the longer direction, and saw blades 111, 112 are provided along an end side and sides of the end part 11. A blade 1 performs cutting of an object 100 by mounting an end part on the opposite side from the end part 11 on an oscillation shaft of an electric tool and by oscillating around the end part. The blade 1 is arranged being inclined with respect to the direction of a cut 110 of the object 100 in a plane in the thickness direction of the object 100, and the blade 1 oscillates and travels in the direction of the cut 110 with the end part 11 in the front. Thus, the cut 110 can be formed by cutting the object 100.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for cutting and removing an object.

  In the past building, there is a thing which sprays the blowing material containing asbestos on a building member for the purpose of fire resistance etc. However, asbestos is said to be a cause of health damage, and its removal treatment is currently in progress.

  When removing such a spraying material, conventionally, the spraying material was removed by removing with a motorized pick. However, a large amount of dust is generated and the working environment is often deteriorated, and since the electric pick is heavy, the workability is also poor. In addition, it took much time and effort to recover the peppers and it was also difficult to partially remove them without damaging the surroundings.

  On the other hand, there is known a method of cutting a spraying material to make grid-like cuts and removing a panel-like portion of the spraying material surrounded by the cuts (see, for example, Patent Documents 1 and 2), It is possible to improve points. Although the spray material is cut using a water jet in Patent Documents 1 and 2, it is also possible to cut the spray material using an electric power tool for cutting.

JP 2008-255655 A JP, 2010-222786, A

  In the case of cutting the spraying material using a water jet, it is necessary to cover the working environment to prevent scattering of water containing asbestos, abrasives for cutting, etc., and it takes time and effort. In addition, it is also necessary to recover water after cutting and separate asbestos and the like.

  On the other hand, as the above-described electric power tools for cutting, there are tools in which cutting is performed by rotating a circular saw at high speed, and tools in which cutting is performed by advancing and retracting a saw blade at high speed. However, in the case of the former, there is a problem that a large amount of dust is scattered when cutting the spraying material. Furthermore, in order to cut a thick spray material, a large circular saw is required, resulting in poor workability. In the latter case, if it is attempted to cut the blowing material until it reaches the building member, the blade may hit the building member and be repelled, resulting in poor workability. Moreover, it is easy to produce the cut-off of a blowing material in the vicinity of a construction member.

  In addition to the above-described power tools, there are tools for swinging a blade at high speed for cutting. Such an electric power tool has the least scattering of dust, and the main body is also small and lightweight, and the workability is also good. However, there was no easy-to-use blade that was convenient when making cuts in the spray material.

  FIG. 9 is a view showing an example of a conventional blade. For example, the blade 10a in FIG. 9A has a shape in which a part of a circle is cut out in a fan shape, and has a saw blade arranged along the remaining circumference. Attach the mounting portion 20 located at the center of the blade 10a to the swinging shaft (not shown) of the electric tool, and swing the blade 10a around the swinging shaft at high speed as shown by the arrow, as shown in FIG. By moving the object 100 to the right side of the object 100, the object 100 can be cut and a cut can be made.

  However, the cutting depth of the blade 10a is limited, and if the cutting depth is increased, the radius of the blade 10a must be increased. When the radius of the blade 10a is increased, the load at the time of cutting may be increased, and the power may not be cut due to the power shortage of the power tool. In addition, when making a cut in the object 100, there are many cutting wastes and a large amount of dust. For example, even if it is sufficient to cut the object 100 to the position shown in A of the figure, the object 100 is extra cut to the range shown by the dotted line B, resulting in poor efficiency leading to an increase in the amount of dust.

  On the other hand, the blade 10b of FIG. 9 (b) is substantially I-shaped, and a saw blade is provided along the end side thereof. The blade 10 b of this type can cut the object 100 deeply by pushing it in the thickness direction of the object 100 while swinging as shown by the arrows in the figure. However, in order to extend the cut to the right in the figure, it is necessary to repeat the process of cutting the object 100 in the thickness direction while inserting and removing the blade 10b, which takes time and effort.

  The blade 10c in FIG. 9 (c) has a substantially triangular end portion, and a saw blade is provided along both oblique sides. Although it is possible to cut the object 100 while moving the blade 10c to the right in the figure, the swing direction of the blade 10c (see the arrow in FIG. 9C) and the arrangement direction of the saw blade (blade 10c) Since it corresponds to the direction of the oblique side of (1), cutting is more difficult than in the case where the swinging direction of the blade 10a and the arrangement direction of the saw blade substantially coincide as shown in FIG. 9 (a). Further, many blades 10c have a large blade thickness, so that the resistance at the time of cutting becomes large and the workability is poor, and the amount of dust generation increases as the cutting volume increases.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of cutting an object which can be suitably cut in the object, and a method of removing the object using the cutting method. I assume.

  A first invention for solving the above-mentioned problems is a cutting method for cutting an object with a blade to form a cut, wherein a longitudinal end of the blade is against an intermediate portion in a longitudinal direction Using a power tool which is widened in a substantially T-shape, a cutting blade is provided along the end side and the side of the end, and the blade is swung about the end opposite to the end The cutting method is characterized in that the object is cut in the direction of the break.

  It is desirable that the intermediate portion of the blade is widened in a substantially arc shape and is continuous with the end portion provided with the cutting blade.

  Further, the blade is disposed to be inclined with respect to the direction of the cut in the plane in the thickness direction of the object, and the end portion provided with the cutting blade is moved forward while swinging the blade. Preferably, the object is cut in the direction of the cut by advancing the blade in the direction of the cut.

  Furthermore, while swinging the blade at the start point or end point of the cut or in the middle of the cut, the blade is advanced in the thickness direction of the object with the end provided with the cutting edge forward. It is also desirable to cut the object in the thickness direction.

  In the present invention, the object can be cut by advancing the blade while swinging the blade at a high speed around the end opposite to the end provided with the cutting blade. As a result, the amount of dust can be reduced, the working environment is improved, and the workability is good.

  When making a cut in the object, for example, while the blade is arranged obliquely with respect to the direction of the cut, the object is cut to make a cut by advancing the blade while swinging and advancing in the direction of the cut. Can. At this time, in addition to the object can be suitably cut with the cutting edge of the end of the blade, the object can also be cut with the cutting edge of the side of the edge of the blade, compared to the case without the cutting edge The object can be easily cut and the cutting depth can be increased.

  The blade of the present invention can also cut the object deeply by advancing the blade in the thickness direction of the object while swinging the blade. By combining the process of advancing the blade in the thickness direction of the object and in the direction of the cut in this manner, the object can be cut efficiently with a small amount of dust at a high cutting speed, and the desired location without damaging the surroundings. In addition, it is possible to make cuts accurately, and to perform cutting in accordance with the unevenness of the base material and the like.

  In addition, since the middle portion of the blade is widened in a substantially arc shape and is continuous with the end portion having the cutting edge, the strength and durability of the blade are maintained while reducing the weight and reducing the middle portion of the blade. It is possible to reliably transmit the swing to the end with the cutting edge. As such, since the weight of the intermediate portion can be reduced, the width of the end portion having the cutting edge can be expanded and the overall length of the blade can be increased, and the cutting depth can be increased.

A second invention is a removal method for removing an object, and the object is cut by the cutting method according to the first invention to form a grid-like cut, and then it is surrounded by the cut of the object. It is a removal method characterized by removing a portion. The target includes, for example, asbestos.
As described above, the object is cut using the above-mentioned blade and cut in a grid, and the object is separated from the base material or the like by vibration during cutting, and a panel-like portion surrounded by the cut is obtained. Removal and removal makes it easy to remove the object, and the processability is good, and it is possible to remove only the desired range and leave the part to be kept intact. In particular, by removing the asbestos-containing spray material and the like by the above-described method, it is possible to reduce the amount of dust generation and to reduce the labor of the operation.

  According to the present invention, it is possible to provide a method of cutting an object which can suitably cut the object, a method of removing the object using the cutting method, and the like.

FIG. The figure which shows the electric tool 4 to which the braid | blade 1 was attached. The figure which shows the cut 110 of the target object 100. FIG. The figure which shows the cutting method of the target object 100. FIG. The figure which shows the cutting method of the target object 100. FIG. The figure which shows the steel frame beam 200a which sprayed the spraying material 100a. The figure which shows the removal method of the spraying material 100a. The figure shown about cutting of spray material 100a. The figure which shows braid | blade 10a, 10b, 10c.

  Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

(1. Blade 1)
FIG. 1 is a view showing a blade 1 used in a cutting method according to an embodiment of the present invention. FIG. 1A is a view of the blade 1 from above, and FIG. 1B is a view of the blade 1 from the side.

  The blade 1 is attached to the rocking shaft 41 of the electric power tool 4 as shown in FIG. 2 and is rocked at high speed in a plane about the rocking shaft 41 as shown by the arrow to cut the object. It is something to do. The swing angle of the blade 1 is, for example, about 3 °.

  As shown in FIG. 1, one end 11 of the blade 1 in the longitudinal direction (corresponding to the left-right direction in FIG. 1) has a shape that is widened in a substantially T shape with respect to the middle portion 13 in the longitudinal direction. The end portions 11 are provided with saw blades 111 and 112 (cutting blades).

  The saw blade 111 is provided at the end of the end 11. The saw blades 111 are arranged in a substantially arc shape. The radius of curvature of the arc is approximately equal to the distance between the end side of the end 11 and the attachment portion 120 described later, more specifically, the distance between the end side and the center of the hole 121 described later.

  The saw blade 112 is provided on the side of the end 11. The side is the side on both sides of the above-mentioned end. The saw blade 112 is arranged along the longitudinal direction of the blade 1.

  The other longitudinal end 12 (the end opposite to the end 11 described above) of the blade 1 is attached to the swing shaft 41 of the power tool 4 described above. The end portion 12 is provided with a mounting portion 120 for mounting on the rocking shaft 41.

  In this example, a substantially circular hole 121 having projecting portions projecting in four directions at 90 ° intervals and a plurality of small holes 122 formed at 30 ° intervals around the hole 121 are provided as the attachment portion 120. However, there is no limitation to this.

  An intermediate portion 13 between the end portions 11 and 12 of the blade 1 is smoothly expanded in a substantially arc shape and continues to the end portion 11. The width of the intermediate portion 13 changes continuously because the intermediate portion 13 of the blade 1 is expanded in a substantially arc shape and is continuous with the end portion 11 in this manner, and the width of the intermediate portion 13 changes rapidly. Stress concentration can be prevented. By applying the above-described measures while narrowing the middle portion 13 of the blade 1, it is possible to reduce the weight of the blade 1 and maintain its strength and durability, which is also advantageous in terms of reliable vibration transmission to the blade tip.

  As shown in FIG. 1 (b), the blade 1 is formed by joining the ends of the two steel plates 2 and 3 with each other. The steel plate 2 constitutes an end 12 of the blade 1, and the steel plate 3 constitutes an end 11 and an intermediate portion 13 of the blade 1.

  The steel plate 2 is a thin plate having a thickness of about 1.25 mm and can be bent in a hook shape. Thus, the position of the mounting portion 120 of the end 12 of the blade 1 is located above the end 11 and the middle portion 13 of the blade 1.

  The steel plate 3 is thinner, and its thickness is about 1 mm at a position where it strikes the end 11 of the blade 1. Thus, by reducing the blade thickness at the end portion 11, the resistance at the time of cutting can be reduced, and the cutting volume is also reduced, so that the amount of dust can be reduced. In addition, in the position which hits the intermediate part 13, the steel plate 3 is still thinner, and is about 0.7 mm.

(2. Cutting method by blade 1)
Next, a cutting method for cutting an object with the blade 1 will be described. Here, an example will be described in which the cut 110 is formed by cutting a predetermined cutting range of the object 100 by the blade 1 attached to the electric power tool 4 as shown in FIG. 3. The object 100 is provided on the surface of the base material 200.

  In this example, while swinging the blade 1 attached to the electric power tool 4 at high speed as described above, first, at the start point of the cutting range (cut 110), as shown by the arrow in FIG. , 112 are advanced in the thickness direction of the object 100, with the end 11 having the front end 112 in front. In addition, "front" shall mean the tip of the direction of movement of blade 1.

  As a result, the object 100 is cut by the saw blade 111 of the blade 1 as shown in FIG. The blade 1 is advanced until the saw blade 111 comes to the position of the base material 200, and the object 100 is cut to the position of the base material 200.

  Next, as shown by arrow a in FIG. 4C, with the end 11 having the saw blades 111 and 112 facing forward, advance the blade 1 in the direction of the cut 110 and extend the cut 110, and Become. The direction of the cut 110 is a direction orthogonal to the thickness direction of the object 100.

  In this embodiment, at this time, the blade 1 is disposed to be inclined with respect to the direction of the cut 110 (refer to the arrow a) in the plane in the thickness direction of the object 100 (in the plane shown in FIG. 4C). Do. Thereby, the blade 1 is advanced in the direction of the cut 110 in a state where the saw blade 111 is obliquely applied to the object 100.

  The arrangement direction of the saw blade 111 of the blade 1 substantially coincides with the swinging direction of the blade 1 shown by the arrow b, and the saw blade 111 vibrates substantially parallel to the cutting surface 101 of the object 100 as shown by the arrow b. By doing this, the object 100 can be suitably cut. The saw blade 112 of the blade 1 cuts the cutting surface 102 of the object 100 by advancing the blade 1 in the cutting direction indicated by the arrow a with the swinging of the blade 1 described above, and scraping the cutting waste to the outside. Can.

  As described above, in this embodiment, in addition to the object 100 can be suitably cut by the saw blade 111 at the end side of the end 11 of the blade 1, the object also becomes the saw blade 112 at the side of the end 11 of the blade 1 As compared with the case where the saw blade 112 is not provided, the object 100 can be easily cut, and the cutting depth of the saw blade 112 can be increased.

  By thus cutting the object 100, the cut 110 is extended as shown in FIG. 4 (d). In the present embodiment, as shown in FIG. 4E at the end point of the cut 110, the strip 1 is pushed back in the thickness direction of the object 100 to form a strip in the thickness direction of the object 100. It can cut without leaving 110.

  As shown in FIG. 5A, when the base material 200 has a convex portion 210 in the middle of the cutting range (the cut 110) of the object 100, for example, as shown in FIG. After pushing the blade 1 in the thickness direction of the object 100 and thereafter advancing the blade 1 in the direction of the cut 110 in the same manner as above along the upper surface of the convex portion 210 as shown in FIG. As shown in (d), the blade 1 is pushed in the thickness direction of the object 100 again at a stage subsequent to the convex portion 210. As a result, the object 100 can be cut according to the unevenness of the base material 200, and the desired cut 110 can be formed cleanly without leaving uncut parts or damaging the base material 200.

  Thus, in the present embodiment, the object 100 is suitably cut by a combination of the step of inclining the blade 1 to advance in the direction of the cut 110 and the step of advancing the blade 1 in the thickness direction of the object 100 The incisions 110 can be formed. In addition, as compared with the case where the circular saw is rotated as described above, or the case where the blade having a shape in which a part of the circle is notched is rocked (see FIG. 9A), the amount of dust generation is small because the cutting volume is small. There are few, and not cutting an extra part.

(3. Removal method of spraying material 100a)
In the present embodiment, the removal process of the object is facilitated by cutting the object and inserting a cut as described above. This will be described with reference to FIGS.

  Here, as shown to Fig.6 (a), the example which removes the blowing material 100a (object) sprayed on the surface of the steel frame cross-beam 200a (base material) of the bottom face of the slab 300 is demonstrated. The spray material 100a is sprayed for the purpose of fire resistance of the steel frame beam 200a and the like, and includes asbestos. 6 (b) and 6 (c) are cross-sectional views taken along the lines A-A and B-B in FIG. 6 (a), respectively.

  The steel frame beam 200a is configured by connecting a plurality of H-shaped steels 201 in the longitudinal direction. In the example of FIG. 6, the contact plate 203 is disposed so as to straddle the ends of the webs of the adjacent H-shaped steels 201, and the ends of the webs of the contact plates 203 and both H-shaped steels 201 are bolts 204 and nuts. By fastening using 205, adjacent H-shaped steels 201 are connected with each other.

  In the present embodiment, as described in FIGS. 4 and 5, etc., the blowing material 100a is cut by the blade 1, and as shown in FIG. 7A, grid-like cuts 110 are formed in the blowing material 100a. The spray material 100a is peeled off from the steel frame beam 200a by the vibration of.

  Thereafter, the panel-like portion 100a 'of the blowing material 100a surrounded by the cut 110 is removed as a block and removed, whereby the blowing material 100a on the surface of the steel frame beam 200a is removed as shown in FIG. 7 (b). The taken out panel-like portion 100a 'can be put out in a bag or the like and carried out, and its recovery is easy.

  In the present embodiment, by performing the cutting as described above, as shown in FIG. 8A, the blowing material 100a can be cut cleanly to the corner of the steel frame beam 200a to form the cut 110, and the uncut portion is left Does not occur. On the other hand, when using a blade having a shape obtained by cutting a part of a circular saw or a circle into a sector shape, as shown in FIG. 8 (b), an arc-shaped cut remains at the corner and a separate operation is necessary for its removal. May be

  Further, as shown in FIG. 8 (c), the blade 1 is advanced as described in FIG. 5 and the like according to the unevenness of the portion attached with the welding plate 203, the bolt 204, the nut 205 and the like. The material 100a can be cut cleanly according to the unevenness, and the cut 110 can be formed without damaging the contact plate 203, the bolt 204, the nut 205, and the like.

  As described above, in the present embodiment, by advancing the blade 1 while swinging the blade 1 at high speed around the end 12 opposite to the end 11 provided with the saw blades 111 and 112, The object 100 can be cut. As a result, the amount of dust can be reduced, the working environment is improved, and the workability is good.

  Moreover, when making the cut 110 in the target object 100, for example in the state which arrange | positioned the blade 1 diagonally with respect to the direction of the cut 110, making the blade 1 rock and advance to the direction of the cut 110 makes the target 100 Preferably, the cut 110 can be inserted. At this time, in addition to suitably cutting the object 100 with the saw blade 111 at the end of the end 11 of the blade 1, the object 100 can be cut with the saw blade 112 of the side of the end 11 of the blade 1, The cutting of the object 100 is easier than when the saw blade 112 is not present, and the cutting depth can also be increased.

  The blade 1 of the present embodiment can also cut the object 100 deeply by advancing the blade 1 in the thickness direction of the object 100 while swinging. By combining the process of advancing the blade 1 in the thickness direction of the object 100 and the direction of the cut 110 in this manner, the object 100 can be efficiently cut with a small amount of dust at a high cutting speed, without damaging the surroundings. In addition, the cut 110 can be accurately formed only at a desired position, and cutting can be performed according to the unevenness or the like of the base material 200.

  In addition, the intermediate portion 13 of the blade 1 is widened in a substantially arc shape to provide a constriction continuous with the end portion 11, thereby making the intermediate portion 13 of the blade 1 narrow and lightweight, while the strength and durability of the blade 1 It is also possible to maintain the rigidity and to reliably transmit the swing of the blade to the end 11. As described above, since the weight of the intermediate portion 13 can be reduced, the width of the end portion 11 having the saw blades 111 and 112 can be expanded and the entire length of the blade 1 can be increased, and the cutting depth can be increased.

  At the time of removal of the spray material 100a containing asbestos, the blade 1 is used to cut the spray material 100a, and the cut 110 is inserted in a grid shape, and the vibration at the time of cutting removes adhesion of the spray material 100a and the steel frame beam 200a. Can be removed from the steel frame beam 200a, and then the panel-like portion 100a 'surrounded by the cut 110 can be taken out and removed. As a result, the removal process of the spray material 100a becomes easy, the work efficiency is good, it is also possible to remove only the desired range and leave the part to be left intact. In particular, by performing the removal of the spray material 100a containing asbestos by the above-described method, the amount of generation of dust can be reduced, and the labor of the operation can be reduced.

  However, the present invention is not limited to the above embodiment. For example, the detailed shape of the blade 1 is such that the end 11 in the longitudinal direction is widened in a substantially T shape with respect to the middle portion 13 and the saw blades 111 and 112 are provided along the end side and side of the end 11 If it is, it will not be limited in particular.

  Moreover, although the spraying material 100a containing asbestos was mentioned as an example of a cutting object in this embodiment, a cutting object is not restricted to this. For example, the object to be cut may be mortar or the like. The base material is not limited to the steel frame beam 200a, and various steel materials may be used. Or the concrete floor slab etc. which provided the mortar which is a cutting object in the upper surface may be sufficient. Further, the cutting blade of the blade 1 is not limited to the saw blades 111 and 112, and may be a cutting stone or the like.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is apparent that those skilled in the art can conceive of various modifications or alterations within the scope of the technical idea disclosed in the present application, and of course these also fall within the technical scope of the present invention. It is understood.

1, 10a, 10b, 10c: blade 2, 3: steel plate 4: power tool 11, 12: end 13: middle portion 20, 120: mounting portion 41: swinging axis 100: target 100a: sprayer 100a ': Panel-like portions 101, 102: cutting surface 110: cuts 111, 112: saw blade 200: base material 200a: steel frame beam 300: slab

Claims (6)

A cutting method for cutting an object with a blade to form a cut, wherein
The longitudinal end of the blade is widened in a substantially T-shape with respect to the longitudinal middle portion,
A cutting edge is provided along the edge and sides of the end,
A cutting method characterized in that the object is cut in the direction of the break using an electric tool which swings the blade about an end opposite to the end.   The cutting method according to claim 1, wherein the intermediate portion of the blade is expanded in a substantially arc shape and is continuous with the end portion provided with the cutting blade. Placing the blade at an angle to the direction of the cut in a plane in the thickness direction of the object;
By advancing the blade in the direction of the cut with the end provided with the cutting blade forward while swinging the blade.
The cutting method according to claim 1 or 2, wherein the object is cut in the direction of the break. At the start or end point of the break or in the middle of the break,
By advancing the blade in the thickness direction of the object with the end provided with the cutting blade forward while swinging the blade.
The cutting method according to claim 3, wherein the object is cut in the thickness direction. A removal method for removing an object, comprising
The method according to any one of claims 1 to 4, wherein the object is cut by a cutting method to form a grid-like cut, and then the portion surrounded by the cut of the object is removed. Method.   The removal method according to claim 5, wherein the object contains asbestos.