JP2020015140A - Saw teeth projection-allowance adjusting device, saw teeth projection-allowance adjusting method, and pipeline cutting method - Google Patents

Abstract

To provide a saw teeth projection-allowance adjusting device that can adapt to pipelines with a plurality of thicknesses and that enables a pipeline cutting operation to be performed without causing damage to an inner cable and a stored article.SOLUTION: A constitution of a saw teeth projection-allowance adjusting device 100 according to the present invention comprises: a gage plate 110 that has a plurality of grooves 112a-112d capable of being subjected to insertion of teeth 102a of a saw 102 and different in depth from one another; and a stopper 120 for fixing the saw 102 in a sandwiching manner in a state in which the teeth 102a of the saw 102 are inserted into the grooves with the predetermined depth among the plurality of grooves 112a-112d of the gage plate 110.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a device for adjusting a protrusion of a saw tooth used when cutting a pipe buried underground, a method of adjusting a protrusion of a saw tooth using such a protrusion adjustment device, and a method of cutting a pipe. Things.

  In recent years, underground wiring has been spreading from the viewpoint of consideration for landscape and safety in cities. In underground wiring, a pipe is buried underground, and a power cable, a communication cable, and the like (hereinafter, simply referred to as a power cable) are laid in the pipe. A manhole for inspection is provided in the ground, and adjacent manholes are connected by a conduit in which a power cable is accommodated in a pipe.

  When a power cable is branched in a pipeline or a new manhole is constructed in the pipeline, it is necessary to cut the pipeline at that location. At this time, it is necessary to pay close attention to the cutting work so as not to damage the power cable housed inside the pipe (pipe).

  As a tool for cutting a pipe, a knife with a stopper as disclosed in Patent Document 1 can be exemplified. In Patent Literature 1, a jig is attached to a knife blade, and the jig is provided at a position above the sawtooth blade of the knife blade by a predetermined cutting depth to regulate the cutting depth. It has a notch stopper. It is considered that if the knife blade with a stopper of Patent Literature 1 is applied to the pipe cutting operation, the pipe (pipe) can be cut without damaging the internal power cable.

JP-A-2006-87589

  Here, there are many types of thicknesses of pipelines used for underground wiring. For this reason, if the cutting depth is controlled by a jig as in Patent Literature 1, the cutting operation cannot be performed when the cutting depth of the jig is different from the thickness of the pipeline. In order to avoid this, it is necessary to bring a plurality of jigs having different cutting depths to the site. Then, since the number of working tools increases, the weight increases, and the burden on the operator increases.

  The present invention has been made in view of the above-described problems, and has a saw tooth that can cope with a pipe having a plurality of thicknesses and that can perform a pipe cutting operation without damaging an internal cable or a stored object. An object of the present invention is to provide a protrusion adjustment device, a saw tooth protrusion adjustment method, and a pipe cutting method.

  In order to solve the above-mentioned problems, a typical configuration of a serration adjustment device of a saw tooth according to the present invention includes a gauge plate having a plurality of grooves into which saw teeth can be inserted and having different depths, and a saw plate. And a stopper for holding the saw in place with the teeth inserted into grooves of a predetermined depth among the plurality of grooves of the gauge plate.

  According to the above configuration, among the plurality of grooves of the gauge plate, a groove having a depth corresponding to the thickness of the pipeline is selected, the saw tooth is inserted, and the saw is fixed with the stopper, so that the saw tooth is formed. The allowance can be adjusted substantially equal to the thickness of the pipeline. Therefore, the pipeline can be cut without the saw teeth contacting the power cable housed in the pipeline, and damage to the power cable when the pipeline is cut can be suitably prevented.

  In the above configuration, a plurality of grooves having different depths are formed in the gauge plate. Thus, a single gauge plate can adjust the protrusion of the sawtooth in accordance with the thickness of a plurality of types of conduits. Therefore, it is possible to cope with pipes having a plurality of thicknesses with one extra adjustment device.

  The stopper is preferably made of an aluminum-based metal. Aluminum-based metals are soft metals. For this reason, when the saw is sandwiched (fastened) by the stopper, the back of the saw bites into the stopper, and the stopper is deformed. As a result, it is possible to prevent the positional deviation of the saw, and to accurately maintain the protrusion of the teeth.

  The end of the saw may be curved and project beyond the edge of the stopper. According to such a configuration, the thin wall inside the pipeline remaining when the pipeline is cut from the outside by the saw teeth can be broken by the end of the saw. At this time, since the end of the saw is curved, that is, not sharp, even if the end of the saw comes into contact with the power cable housed inside the conduit, the power cable is not damaged. . Therefore, it is possible to more reliably prevent the power cable from being damaged.

  The stopper may have a handle for catching a finger. This makes it easy to apply force when pulling the saw. Therefore, it is possible to enhance the workability at the time of the pipe cutting operation using the extra margin adjusting device.

  In order to solve the above-mentioned problem, a representative configuration of the saw tooth protrusion adjustment method according to the present invention is a saw tooth protrusion adjustment method using the saw tooth protrusion adjustment device. Then, the teeth of the saw were inserted into the grooves of a predetermined depth among the plurality of grooves of the gauge plate, a stopper for sandwiching and fixing the saw was attached to the saw, and the lower end of the stopper was brought into contact with the upper surface of the gauge plate. The components corresponding to the technical idea and the description of the above-described saw tooth protrusion adjusting device, which is characterized by fixing the stopper in the state, are also applicable to the saw tooth protrusion adjusting method. .

  In order to solve the above-mentioned problem, a typical configuration of a pipe cutting method according to the present invention is a pipe cutting method at a site where a pipe in which a cable or an object is stored is installed, The outer periphery of the two sections at both ends of the section to be cut is cut with a saw while leaving a thin wall, and the remaining thin wall is penetrated through the end of the saw to break the thin wall and cut the pipe in the section to be cut. It is characterized in that it is detached from the cable by cutting the lower part of the divided pipe in the axial direction with the divided pipe hanging from the cable.

  At the site where multiple pipelines are installed, other pipelines are arranged in the vertical and horizontal directions of the pipeline to be cut, so the working space is extremely narrow and the cutting work must be performed efficiently Is difficult. Therefore, in the above configuration, the pipeline is cut in a state where the thin wall is left by a saw using the above-mentioned margin adjusting device, and the thin wall is broken to divide the pipeline. Then, the lower part of the divided pipeline is cut in the axial direction while the divided pipeline is hung on the cable. At this time, if the divided pipeline is hung on the cable, a space is created between the cable and the lower part of the pipeline. Thereby, contact between the saw and the cable when cutting the lower part of the pipeline can be prevented. Therefore, even in a narrow space, it is possible to perform a satisfactory cutting operation without damaging the cable.

  ADVANTAGE OF THE INVENTION According to this invention, it can respond to the pipeline of several thicknesses, and it is possible to perform the cutting | disconnection operation of the saw tooth which can perform the cutting | disconnection operation of a pipeline without damaging an internal cable and an accommodation thing, It is possible to provide a method for adjusting the protrusion of saw teeth and a method for cutting a pipe.

It is a figure explaining the projection adjustment device of the saw tooth concerning this embodiment. FIG. 2 is a diagram for explaining a method of adjusting the protrusion of a saw tooth using the protrusion adjusting device shown in FIG. 1. It is a figure explaining the site which requires cutting of a pipeline. It is a figure explaining the cutting method in the case of one pipeline buried in a pipeline part. It is a figure explaining the cutting method of the pipeline concerning this embodiment. It is a figure explaining thin break work. It is a figure explaining a handle.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, and the like shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the specification and the drawings, elements having substantially the same function and configuration will be denoted by the same reference numerals, and redundant description will be omitted. Elements not directly related to the present invention will be omitted. I do.

(Saw tooth adjustment device)
FIG. 1 is a view for explaining a saw tooth protrusion adjustment device (hereinafter, referred to as a protrusion adjustment device 100) according to the present embodiment. As shown in FIG. 1, the exchanging adjustment device 100 of the present embodiment includes a gauge plate 110 and a stopper 120. A plurality of grooves 112a, 112b, 112c, 112d are formed in the gauge plate 110. The plurality of grooves 112a-112d have different depths, and the teeth 102a of the saw 102 can be inserted. The depth of the groove (protrusion of the sawtooth) is, for example, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or the like.

  The stopper 120 clamps the saw 102 in a state where the teeth 102 a of the saw 102 are inserted into grooves of a predetermined depth among the plurality of grooves 112 a to 112 d of the gauge plate 110 and fixed. The stopper 120 includes two holding pieces 122, and the two holding pieces 122 are connected by the bolt 104.

(Saw tooth adjustment device)
FIG. 2 is a diagram illustrating a method for adjusting the protrusion of the saw tooth using the protrusion adjusting device 100 shown in FIG. 1 (hereinafter, simply referred to as a protrusion adjusting method). 2A, the saw 102 is first inserted into a groove of a predetermined depth (112c is illustrated in FIG. 2) among a plurality of grooves 112a to 112d of the gauge plate 110, as shown in FIG. Insert the tooth 102a. Then, the stopper 120 is attached to the saw 102.

  Next, as shown in FIG. 2B, the bolt 104 is fastened to the nut 106 with the lower end of the stopper 120 abutting on the upper surface 110 a of the gauge plate 110, and the stopper 120 is fixed to the saw 102. Thus, as shown in FIG. 2C, the saw 102 is fixed in a state of being sandwiched between the holding pieces 122 of the stopper 120, and the protrusion of the teeth 102a of the saw 102 is adjusted to be equal to the depth of the groove 112c.

  According to the above configuration, among the plurality of grooves 112a to 112d of the gauge plate 110, a groove having a depth corresponding to the thickness of the pipe to be cut is selected, the teeth 102a of the saw 102 are inserted, and the stoppers 120 are used. By fixing the saw 102, the protrusion of the teeth 102a of the saw 102 can be adjusted to be substantially equal to the thickness of the conduit. Therefore, it becomes possible to cut the pipeline without the teeth of the saw 102 coming into contact with the power cable housed inside the pipeline, and it is possible to suitably prevent the power cable from being damaged when the pipeline is cut. .

  In the above-described gauge plate 110, a plurality of grooves 112a to 112d having different depths are formed. This allows one gauge plate 110 to adjust the protrusion of the teeth 102a of the saw 102 according to the thickness of a plurality of types of conduits. Therefore, it is possible to handle a pipe having a plurality of thicknesses with one extra adjustment device 100.

  The stopper 120 described above is preferably made of an aluminum-based metal. Since the aluminum-based metal is a soft metal, when the saw 102 is sandwiched and fixed by the stopper 120, the back of the saw 102 bites into the stopper 120, and the stopper 120 is deformed. Accordingly, it is possible to prevent the position of the saw 102 from being shifted, and to accurately maintain the protrusion of the teeth 102a of the saw 102 after the adjustment.

  The stopper 120 may have a handle for catching a finger. This makes it easier to apply force when sawing. Therefore, it is possible to improve the workability at the time of the pipe cutting operation using the outlet adjustment device 100. Further, as shown in FIG. 1, the end of the saw 102 may be curved and project from the edge of the stopper 120. This allows the thin wall inside the conduit to be broken by the end of the saw. Details of these will be described later.

(How to cut the pipe)
Next, a method for cutting a pipe according to the present embodiment will be described. FIG. 3 is a diagram illustrating a site where the pipe needs to be cut. As shown in FIG. 3A, in the underground wiring, a pipe 210 containing a power cable 202 therein (hereinafter, referred to as a pipe 204) is formed. In the ground, the adjacent manholes 200a and 200b are connected to each other by the pipeline 210, and the power cables 202 are connected to each other at a cable connecting portion 212 in the manholes 200a and 200b.

  In the underground wiring shown in FIG. 3A, when the power cable 202 is branched at the pipeline 210, the pipeline 204 of the pipeline 210 is cut, and a new power cable 202 is stored in the power cable 202 housed therein. It is necessary to connect the power cable 202a. Therefore, as shown in FIG. 3B, a new manhole 200c is constructed, the pipeline 204 is cut, and a new power cable 202b is connected to the power cable 202 at the branch connection 214 in the new manhole 200c. At this time, it is necessary to pay close attention to the cutting operation of the pipeline 204 so as not to damage the power cable 202 housed inside the pipeline 204.

  FIG. 4 is a diagram illustrating a cutting method when the number of the pipes 204 buried in the pipe section 210 is one. In the case where the number of the pipes 204 buried in the pipe section 210 is one (single), no other pipe exists above the pipe 204. For this reason, a sufficient work space can be secured above the pipeline 204.

  Therefore, when there is one pipe 204, first, as shown in FIG. 4A, the upper part 204a of the pipe 204 is radially cut by a cutting tool 232, and then the upper part 204a is axially cut by a sander 234. Cut in the direction. As a result, an opening 204b is formed above the conduit 204 as shown in FIG. At this time, as shown in FIG. 4A, since the power cable 202 is located at the lower part of the conduit 204, the work of providing the opening 204b in the upper part 204a does not easily make contact with the power cable 202.

  After the opening 204b is formed in the upper part of the conduit 204, as shown in FIG. 4B, a protective material 206 (usually a steel plate) is inserted between the conduit 204 and the power cable 202 from the opening 204b. Then, the lower part of the conduit 204 is cut by the cutting tool 232, whereby the conduit 204 is cut. At this time, the lower part of the pipeline 204 is protected by the protective material 206. Therefore, damage to the power cable 202 due to contact with the cutting tool 232 can be suitably prevented.

  As described above, in the case where the number of the pipes 204 is one, it is possible to relatively easily perform the pipe cutting work while preventing the power cable 202 from being damaged. On the other hand, when there are a plurality of (multiple) pipes 204, another pipe may exist above the pipe 204. Then, since it is difficult to form the opening 204b in the upper portion 204a of the conduit 204, the power cable 202 cannot be protected by the protective material 206. Therefore, in the present embodiment, a pipe cutting method capable of performing the cutting work of the pipe 204 without damaging the internal power cable 202 even when the pipe 204 is plural (multiple). provide.

(How to cut the pipe)
FIG. 5 is a diagram illustrating a method of cutting the pipe 204 according to the present embodiment (hereinafter, referred to as a cutting method). In this embodiment, as shown in FIG. 5A, a description will be given by exemplifying a case in which the lower central pipe 204 of the six pipes 204 in three columns and two rows is cut. However, the present invention is not limited to this, and the cutting method of the present embodiment can be applied regardless of the number of pipelines. In the following description, a section (shown by hatching in FIG. 5A) of the pipe line 204 is referred to as a section 205.

  In the cutting method of the present embodiment, first, the protrusion of the teeth 102a of the saw 102 is adjusted by the protrusion adjustment method using the protrusion adjustment device 100 described above (see FIG. 2). At this time, of the plurality of grooves 112a-112d of the gauge plate 110, a groove having a depth slightly smaller than the thickness of the conduit 204 is selected, and the protrusion of the teeth 102a of the saw 102 is adjusted according to the depth of the groove. adjust.

  After adjusting the protruding margin of the teeth 102a of the saw 102, as shown in FIG. 5B, the outer periphery of the pipe line 204 is cut at the two ends at both ends of the section 205 to be cut. At this time, the protrusion of the teeth 102a of the saw 102 is adjusted to be slightly thinner than the thickness of the conduit 204, so that the section 205 is cut with the thin wall 205a (see FIG. 6) left. Therefore, the saw 102 does not come into contact with the power cable 202 at the time of cutting the outer periphery, and damage to the power cable 202 can be prevented.

  Next, the end portion 102b (see FIG. 1) of the saw 102 is passed through the thin wall 205a remaining inside the section 205. Thereby, the thin wall 205a is broken, and as shown in FIG. 5C, the section 205 to be cut (the pipe 204) is divided into a tubular shape, and the section 205 is hung on the power cable 202.

  FIG. 6 is a diagram for explaining the work of breaking the thin wall 205a. 1 and 6, the end portion 102b of the saw 102 is curved and protrudes from the edge of the stopper 120, as shown in FIGS. Thereby, as shown in FIG. 6, by inserting the end 102b of the saw 102 into the section 205, the inner thin portion 205a remaining when the outer periphery is cut by the teeth 102a of the saw 102 is suitably broken. be able to.

  At this time, the end 102b of the saw 102 is curved, that is, not sharp. Thus, even if the end 102b of the saw 102 comes into contact with the power cable 202, the power cable 202 is not damaged. Therefore, it is possible to more reliably prevent the power cable 202 from being damaged.

  FIG. 7 is a diagram illustrating a handle. As described above, in the exit adjustment device 100 of the present embodiment, the handle is provided to the stopper. More specifically, as shown in FIGS. 2 and 7, the length of the screw portion 104a of the bolt 104 is set longer than the thickness of the stopper 120 and the nut, so that the screw portion 104a functions as a handle. As a result, as shown in FIG. 7, the operator can hook a finger (shown by a broken line) on the screw portion serving as the handle when performing the section cutting operation. Thereby, workability at the time of cutting the pipeline 204 using the outlet adjustment device 100 can be improved.

  FIG. 5 is referred to again. As described above, when the thin portion 205a of the section 205 is broken, the lower part of the section 205 is hung with the sander 234 while the section 205 (the pipe 204) is hung on the power cable 202 as shown in FIG. Cut in the axial direction. Thus, the section 205 to be disconnected can be removed from the power cable 202.

  At this time, as shown in FIG. 5C, a space is created between the power cable 202 and the lower part of the section 205 by suspending the divided section 205 on the power cable 202. Thereby, contact between the saw 102 and the power cable 202 when cutting the lower part of the section 205 can be prevented. Therefore, even in a narrow space, the cutting operation can be performed well without damaging the power cable 202.

  In the present embodiment, the margin of the teeth 102a of the saw 102 is adjusted to be slightly smaller than the thickness of the conduit 204. However, if the thin wall 205a cannot be broken at the end 102b of the saw 102, a gauge plate Of the plurality of grooves 110a-112d of 110, it is preferable to adjust the protrusion of the teeth 102a of the saw 102 using the next deeper groove than the previously adjusted depth. When the thickness of the conduit 204 is unknown, the thickness is adjusted using the shallowest groove among the plurality of grooves 112a to 112d of the gauge plate 110, and if the thin portion cannot be broken at the end 102b of the saw 102, Next, it is preferable to repeat the operation of adjusting using a deep groove.

  Further, in the present embodiment, the case where the conduit 204 accommodating the power cable 202 is cut has been described as an example, but the present invention is not limited to this. For example, the pipeline cutting method of the present invention can be applied to a case where a pipeline that accommodates a cable other than the power cable 202 or a pipeline that accommodates an object other than the cable is also severed.

As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can conceive various changes or modifications within the scope of the claims, and these naturally belong to the technical scope of the present invention. I understand.
Enter

  The present invention relates to a saw tooth protrusion adjustment device used when cutting a pipe buried underground, a saw tooth protrusion adjustment method and a pipe cutting method using such a protrusion adjustment device. Can be used.

100: Outgoing adjustment device, 102: Saw, 102a: Teeth, 102b: End, 104: Bolt, 104a: Screw part, 110: Gauge plate, 110a: Top surface, 112a: Groove, 112b: Groove, 112c: Groove, 112d: groove, 120: stopper, 122: clamping piece, 200a: manhole, 200b: manhole, 200c: manhole, 202: power cable, 202a: power cable, 202b: power cable, 204: conduit, 204a: upper part, 204b ... Opening, 205 section, 205a thin, 206 protective material, 210 pipe section, 212 cable connection section, 214 branch connection section, 232 cutting tool, 234 sander

Claims (6)

A gauge plate having a plurality of grooves into which saw teeth can be inserted and each having a different depth,
A stopper that fixes the saw while inserting the saw into the groove having a predetermined depth among the plurality of grooves of the gauge plate.
A saw tooth adjustment device, comprising:   The device according to claim 1, wherein the stopper is made of an aluminum-based metal.   The device for adjusting the margin of a saw tooth according to claim 1 or 2, wherein an end of the saw is curved and protrudes from an edge of the stopper.   4. The device according to claim 1, wherein the stopper has a handle for catching a finger. 5. A saw tooth protrusion adjustment method using the saw tooth protrusion adjustment device according to any one of claims 1 to 4,
Inserting a saw tooth into a groove of a predetermined depth among the plurality of grooves of the gauge plate,
Attach the stopper that holds the saw in between and fixes it to the saw,
A method of adjusting a protrusion of a saw tooth, comprising: fixing the stopper while a lower end of the stopper is in contact with an upper surface of the gauge plate. A method for cutting a pipeline at a site where a pipeline in which a cable or an article is stored is installed,
Cutting the outer periphery of two places at both ends of the section to be cut in the pipe line while leaving a thin wall with a saw,
By piercing the end of the saw into the remaining thin wall, the thin wall is broken to cut the pipe line of the section to be cut into a tubular shape,
A method for cutting off a pipeline, wherein the disconnected pipeline is suspended from the cable by hanging a lower portion of the pipeline in an axial direction in a state of hanging from the cable.

Images