JP6768587B2 - Cutting method and removal method of the object - Google Patents

Description

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

In some existing buildings, spraying materials containing asbestos are sprayed on building members for the purpose of fire resistance. However, asbestos is said to be a cause of health hazards, and its removal treatment is currently underway.

When removing such a spraying material, conventionally, the spraying material has been scraped off with an electric pick to remove it. However, a large amount of dust is often generated and the working environment is poor, and since the electric pick is a heavy object, the workability is also poor. Furthermore, it took a lot of time and effort to collect the chipping, and it was difficult to partially remove it without damaging the surroundings.

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

Japanese Unexamined Patent Publication No. 2008-255655 Japanese Unexamined Patent Publication No. 2010-222786

When cutting a spray material using a water jet, it is necessary to cover the working environment in order to prevent the scattering of water containing asbestos and abrasives for cutting, which is troublesome. It is also necessary to collect the water after cutting to separate asbestos and the like.

On the other hand, among the above-mentioned power tools for cutting, there are those that perform cutting by rotating a circular saw at high speed and those that perform cutting by moving the saw blade forward and backward at high speed. However, in the former case, there is a problem that a large amount of dust is scattered when cutting the spray material. Further, a large circular saw is required to cut a thick spray material, which deteriorates workability. Further, in the latter case, if the spray material is to be cut until it reaches the building member, the blade may hit the building member and be bounced off, resulting in poor workability. In addition, the spray material is likely to be left uncut near the building material.

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

FIG. 9 is a diagram showing an example of a conventional blade. For example, the blade 10a of 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. The mounting portion 20 located at the center of the blade 10a is attached to a swing shaft (not shown) of the power tool, and the blade 10a is shown while swinging the blade 10a around the swing shaft at high speed as shown by an arrow. By moving it to the right side of, 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 to be increased, the radius of the blade 10a must be increased. If the radius of the blade 10a is increased, the load at the time of cutting becomes large, and cutting may not be possible due to insufficient power of the power tool. Further, when making a cut in the object 100, there is a lot of waste in cutting and a large amount of dust is generated. For example, even if the object 100 may be cut to the position shown in A in the figure, it will be cut excessively to the range shown by the dotted line B, which is inefficient and leads to an increase in the amount of dust generated.

On the other hand, the blade 10b in FIG. 9B has a substantially I-shape, and a saw blade is provided along the end edge thereof. This type of blade 10b can deeply cut the object 100 by pushing it in the thickness direction of the object 100 while swinging as shown by the arrow in the figure. However, in order to extend the cut to the right side of the drawing, it is necessary to repeat the process of cutting the object 100 in the thickness direction while inserting and removing the blade 10b, which is troublesome.

The blade 10c of FIG. 9C has a substantially triangular end, and saw blades are provided along both hypotenuses. Although it is possible to cut the object 100 while moving the blade 10c to the right side of the drawing, the swing direction of the blade 10c (see the arrow in FIG. 9C) and the arrangement direction of the saw blades (blade 10c). Since (corresponding to the direction of the oblique side) is different, cutting becomes more difficult than in the case where the swing direction of the blade 10a and the arrangement direction of the saw blades substantially match as shown in FIG. 9A. In addition, many of such blades 10c have a large blade thickness, which increases resistance during cutting and impairs workability, and also increases the amount of dust generated as the cutting volume increases.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cutting method of an object capable of making a suitable cut in the object, a method of removing the object using the cutting method, and the like. And.

The first invention for solving the above-mentioned problems is a cutting method in which an object is cut by a blade to form a cut, and the end portion in the longitudinal direction of the blade is relative to an intermediate portion in the longitudinal direction. Using an electric tool that widens in a substantially T shape, a cutting blade is provided along the end edge and the side edge of the end portion, and the blade is swung around the end portion opposite to the end portion. , A cutting method characterized in that the object is cut in the direction of the cut.

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

Further, the blade is arranged so as 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. It is desirable to cut the object in the direction of the cut by advancing the blade in the direction of the cut.

Further, at the start point or end point of the cut or in the middle of the cut, the blade is swung while advancing the blade in the thickness direction of the object in front of the end provided with the cutting blade. Therefore, it is also desirable to cut the object in the thickness direction.

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

When making a cut in an object, for example, with the blade placed diagonally with respect to the direction of the cut, the blade is swung and moved in the direction of the cut to cut the object and make a cut. Can be done. At this time, in addition to being able to appropriately cut the object with the cutting blade at the end of the blade, the object can also be cut with the cutting blade on the side of the end of the blade, compared to the case without the cutting blade. The object can be easily cut and the cutting depth can be increased.

Further, the blade of the present invention can cut an object deeply by advancing the blade in the thickness direction of the object while swinging the blade. By combining the steps of advancing the blade in the thickness direction and the cut direction of the object in this way, the object can be cut efficiently with a small amount of dust at a high cutting speed, and the desired location is not damaged. It is possible to make a cut accurately only in the base material, and it is possible to perform cutting according to the unevenness of the base material.

In addition, the middle part of the blade is widened in a substantially arc shape and continuous with the end part having the cutting blade, so that the middle part of the blade is narrowed and lightweight, while maintaining the strength and durability of the blade, and the blade The swing can be reliably transmitted to the end having the cutting blade. Since the weight of the intermediate portion can be reduced in this way, the width of the end portion having the cutting blade can be widened and the total length of the blade can be increased, and the cutting depth can be increased.

The second invention is a removal method for removing an object, in which the object is cut by the cutting method of the first invention to form a grid-like cut, and then surrounded by the cut of the object. It is a removal method characterized by removing a portion of the material. The object includes, for example, asbestos.
In this way, the object is cut using the blade to make a grid-like cut, the object is peeled off from the base material or the like by vibration during cutting, and then the panel-shaped part surrounded by the cut is formed. By taking out and removing the object, the removal process of the object becomes easy, the workability is good, and it is possible to remove only the desired range and leave the portion to be retained intact. In particular, by removing the spray material containing asbestos by the above method, the amount of dust generated can be reduced and the labor of work can be reduced.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a cutting method of an object capable of making a suitable cut in the object, a method of removing the object using the cutting method, and the like.

The figure which shows the blade 1. The figure which shows the power tool 4 which attached the blade 1. The figure which shows the cut 110 of the object 100. The figure which shows the cutting method of the object 100. The figure which shows the cutting method of the object 100. The figure which shows the steel frame beam 200a which sprayed the spray material 100a. The figure which shows the removal method of the spray material 100a. The figure which shows the cutting of the spray material 100a. The figure which shows the blade 10a, 10b, 10c.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

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

This blade 1 is used by being attached to the swing shaft 41 of the power tool 4 as shown in FIG. 2, and swings at high speed in a plane about the swing shaft 41 as shown by an arrow to cut an 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 of FIG. 1) has a shape widened in a substantially T shape with respect to the intermediate portion 13 in the longitudinal direction. Saw blades 111 and 112 (cutting blades) are provided at the end portion 11.

The saw blade 111 is provided on the end edge of the end portion 11. The saw blades 111 are arranged in a substantially arc shape. The radius of curvature of the arc is substantially equal to the distance between the end edge of the end portion 11 and the mounting portion 120 described below, and more specifically the distance between the end edge and the center of the hole 121 described below.

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

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

In this example, the mounting portion 120 is provided with a substantially circular hole 121 having protrusions protruding in four directions at 90 ° intervals and a plurality of small holes 122 formed at 30 ° intervals around the hole 121. However, it is not limited to this.

The intermediate portion 13 between the end portions 11 and 12 of the blade 1 smoothly widens in a substantially arc shape and continues to the end portion 11. In this way, the intermediate portion 13 of the blade 1 is widened in a substantially arc shape and is continuous with the end portion 11, so that the width of the intermediate portion 13 is continuously changed, and the width of the intermediate portion 13 is suddenly changed. It is possible to prevent stress from concentrating. By applying the above-mentioned measures while making the intermediate portion 13 of the blade 1 narrow, the strength and durability of the blade 1 can be maintained while reducing the weight, which is also advantageous in terms of reliable vibration transmission to the blade tip.

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

The steel plate 2 has a thin thickness of about 1.25 mm and can be bent into a hook shape. As a result, the position of the mounting portion 120 of the end portion 12 of the blade 1 comes above the end portion 11 and the intermediate portion 13 of the blade 1.

The steel plate 3 is thinner, and its thickness is about 1 mm at the position where it hits the end portion 11 of the blade 1. By reducing the blade thickness at the end portion 11 in this way, the resistance at the time of cutting can be reduced, and the cutting volume is also reduced, so that the amount of dust generated can be reduced. At the position corresponding to the intermediate portion 13, the steel plate 3 is thinner, about 0.7 mm.

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

In this example, while swinging the blade 1 attached to the 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. 4A, the saw blade 111 , 112, and the blade 1 is advanced in the thickness direction of the object 100 in front of the end portion 11. In addition, "front" means the tip in the traveling direction of the blade 1.

As a result, the object 100 is cut by the saw blade 111 of the blade 1 as shown in FIG. 4 (b). The blade 1 advances until the saw blade 111 reaches 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 the arrow a in FIG. 4C, the procedure of advancing the blade 1 in the direction of the cut 110 and extending the cut 110 in front of the end portion 11 having the saw blades 111 and 112. Become. The direction of the cut 110 is a direction orthogonal to the thickness direction of the object 100.

In the present embodiment, at this time, the blade 1 is arranged so as to be inclined with respect to the direction of the cut 110 (see arrow a) in the plane in the thickness direction of the object 100 (in the plane shown in FIG. 4C). To do. As a result, the blade 1 is advanced in the direction of the cut 110 while the saw blade 111 is obliquely applied to the object 100.

The arrangement direction of the saw blades 111 of the blade 1 substantially coincides with the swing direction of the blade 1 indicated 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 so, the object 100 can be suitably cut. The saw blade 112 of the blade 1 scrapes the cutting surface 102 of the object 100 and scrapes the cutting chips outward by the blade 1 moving in the cutting direction indicated by the arrow a along with the swing of the blade 1 described above. Can be done.

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

By cutting the object 100 in this way, the cut 110 is extended as shown in FIG. 4D. In the present embodiment, by pushing the blade 1 again in the thickness direction of the object 100 as shown in FIG. 4 (e) at the end point of the cut 110, a strip-shaped cut is formed in the plane of the object 100 in the thickness direction. 110 can be cut without leaving any residue.

When the base material 200 has a convex portion 210 in the middle of the cutting range (cut 110) of the object 100 as shown in FIG. 5 (a), for example, as shown in FIG. 5 (b) in the front stage of the convex portion 210. The blade 1 is pushed in the thickness direction of the object 100, and then the blade 1 is advanced in the direction of the cut 110 along the upper surface of the convex portion 210 as shown in FIG. 5C, and then in FIG. As shown in (d), the blade 1 is pushed again in the thickness direction of the object 100 at the subsequent stage of the convex portion 210. As a result, the object 100 can be cut according to the unevenness of the base material 200, and a desired cut 110 can be neatly formed without causing uncut parts or damaging the base material 200.

As described above, in the present embodiment, the object 100 is suitably cut by a combination of a step of tilting the blade 1 to advance in the direction of the cut 110 and a step of advancing the blade 1 in the thickness direction of the object 100. The cut 110 can be formed. Further, compared to the case where the circular saw is rotated as described above or the blade having a shape in which a part of the circle is cut out in a fan shape is swung (see FIG. 9A), the cutting volume is smaller and the amount of dust generated is larger. There are few, and there is no need to cut extra parts.

(3. Method of removing spray material 100a)
In the present embodiment, the object is easily removed by cutting the object and making a cut as described above. This will be described with reference to FIGS. 6 to 8.

Here, as shown in FIG. 6A, an example of removing the spraying material 100a (object) sprayed on the surface of the steel beam 200a (base material) on the bottom surface of the slab 300 will be described. It is assumed that the spray material 100a is sprayed for the purpose of fire resistance of the steel frame beam 200a and contains asbestos. 6 (b) and 6 (c) are views showing cross sections along lines AA and BB of FIG. 6 (a), respectively.

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

In the present embodiment, the spraying material 100a is cut by the blade 1 as described with reference to FIGS. 4 and 5, and a grid-like cut 110 is formed in the spraying material 100a as shown in FIG. 7A. The spray material 100a is peeled from the steel beam 200a by the vibration of.

After that, the panel-shaped portion 100a'of the spray material 100a surrounded by the cut 110 is taken out and removed as a lump, so that the spray material 100a on the surface of the steel frame beam 200a is removed as shown in FIG. 7B. The taken out panel-shaped portion 100a'can be put 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 spray material 100a can be cut cleanly to the corner of the steel frame beam 200a to form a cut 110, and the cut portion 110 can be formed. Will not occur. On the other hand, when the circular saw or a blade having a shape in which a part of a circle is cut out in a fan shape is used, an arc-shaped uncut portion is generated at a corner as shown in FIG. 8B, and a separate operation is required to remove the uncut portion. May become.

Further, the portion to which the splicing plate 203, the bolt 204, the nut 205, etc. are attached is also sprayed as shown in FIG. 8 (c) by advancing the blade 1 according to the unevenness as described in FIG. It is possible to cleanly cut the material 100a according to the unevenness and form the cut 110 without damaging the splicing plate 203, the bolt 204, the nut 205, and the like.

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

When making a cut 110 in the object 100, for example, in a state where the blade 1 is arranged diagonally with respect to the direction of the cut 110, the blade 1 is swung and moved in the direction of the cut 110, so that the object 100 A cut 110 can be preferably made in. At this time, in addition to being able to appropriately cut the object 100 with the saw blade 111 at the end of the end 11 of the blade 1, the object 100 can also be cut with the saw blade 112 on the side of the end 11 of the blade 1. Compared with the case where the saw blade 112 is not provided, the object 100 can be easily cut and the cutting depth can be increased.

Further, the blade 1 of the present embodiment can deeply cut the object 100 by advancing the blade 1 in the thickness direction of the object 100 while swinging the blade 1. By combining the steps of advancing the blade 1 in the thickness direction of the object 100 and the direction of the cut 110 in this way, the object 100 can be efficiently cut with a small amount of dust at a high cutting speed without damaging the surroundings. It is possible to accurately make a cut 110 only in a desired portion, and it is possible to perform cutting according to the unevenness of the base material 200 or the like.

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, so that the intermediate portion 13 of the blade 1 is narrowed and lightweight, while the strength and durability of the blade 1 are increased. The property can be maintained, and the swing of the blade can be reliably transmitted to the end portion 11. As described above, the weight of the intermediate portion 13 can be reduced, so that the width of the end portion 11 having the saw blades 111 and 112 can be widened and the total length of the blade 1 can be increased, and the cutting depth can be increased.

When removing the spraying material 100a containing asbestos, the spraying material 100a is cut using the blade 1 to make cuts 110 in a grid pattern, and the spraying material 100a and the steel beam 200a are removed by vibration during cutting to remove the spraying material 100a. Can be removed from the steel beam 200a, and then the panel-shaped portion 100a'surrounded by the cut 110 can be taken out and removed. As a result, the spraying material 100a can be easily removed, workability is good, and it is possible to remove only a desired range and leave a portion to be retained intact. In particular, by removing the spray material 100a containing asbestos by the above method, the amount of dust generated can be reduced and the labor of work can be reduced.

However, the present invention is not limited to the above embodiment. For example, in the detailed shape of the blade 1, the end portion 11 in the longitudinal direction is widened in a substantially T shape with respect to the intermediate portion 13, and saw blades 111 and 112 are provided along the end side and the side side of the end portion 11. If so, there is no particular limitation.

Further, in the present embodiment, the spray material 100a containing asbestos is mentioned as an example of the cutting target, but the cutting target is not limited to this. For example, the cutting target may be mortar or the like. The base material is not limited to the steel beam 200a, and may be various steel materials. Alternatively, it may be a concrete floor slab having a mortar to be cut on the upper surface. Further, the cutting blade of the blade 1 is not limited to the saw blades 111 and 112, and may be a cutting grindstone or the like.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1, 10a, 10b, 10c: Blade 2, 3: Steel plate 4: Power tool 11, 12: End 13: Intermediate 20, 120: Mounting 41: Swing shaft 100: Object 100a: Spray material 100a': Panel-shaped parts 101, 102: Cutting surface 110: Cut 111, 112: Saw blade 200: Base material 200a: Steel beam 300: Slab

Claims (6)

It is a cutting method that cuts an object with a blade to form a cut.
The end portion of the blade in the longitudinal direction is widened in a substantially T shape with respect to the intermediate portion in the longitudinal direction.
Cutting blades are provided along the edges and sides of the ends.
A cutting method characterized in that the object is cut in the direction of the cut by using an electric tool that swings the blade around an end opposite to the end. The cutting method according to claim 1, wherein 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. The blade is arranged in a plane in the thickness direction of the object so as to be inclined with respect to the direction of the cut.
While swinging the blade, the blade is advanced in the direction of the cut in front of the end provided with the cutting blade.
The cutting method according to claim 1 or 2, wherein the object is cut in the direction of the cut. At the start or end of the break or in the middle of the break
By swinging the blade and advancing the blade in the thickness direction of the object in front of the end provided with the cutting blade.
The cutting method according to claim 3, wherein the object is cut in the thickness direction. A removal method that removes an object
A removal 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 of the object surrounded by the cut is removed. Method. The removal method according to claim 5, wherein the object contains asbestos.