JP7141881B2 - Apparatus for adjusting saw tooth protrusion, method for adjusting saw tooth protrusion, and method for cutting pipeline - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saw tooth protrusion adjusting device used for cutting a pipeline buried in the ground, a saw tooth protrusion adjusting method using such a saw tooth protrusion adjusting device, and a pipe cutting method. It is.

BACKGROUND ART In recent years, underground wiring has been popularized from the viewpoint of consideration for landscape and safety in cities. In underground wiring, pipes are buried in the ground, and power cables, communication cables, etc. (hereinafter simply referred to as power cables) are laid in the pipes. Manholes for inspection are provided in the ground, and adjacent manholes are connected by conduits in which power cables are accommodated.

When branching a power cable at a pipeline portion or constructing a new manhole at a pipeline portion, 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 pipeline (piping).

As a tool for cutting a pipeline, a knife blade with a stopper as disclosed in Patent Document 1 can be exemplified. In Patent Document 1, a jig is attached to the knife blade, and the jig is provided at a position above the serrated blade of the knife blade by a predetermined depth of cut to regulate the depth of cut. Has a notch stopper. If the knife blade with a stopper of Patent Document 1 is applied to the work of cutting a pipeline, it is conceivable that the pipeline (piping) can be cut without damaging the internal power cable.

JP-A-2006-87589

Here, there are many types of thicknesses of conduits used for underground wiring. For this reason, if the cutting depth is restricted by a jig as in Patent Document 1, cutting cannot be performed if the cutting depth of the jig is different from the thickness of the pipeline. In order to avoid this, it is necessary to bring multiple jigs with different cutting depths to the site. As a result, the number of working tools is increased, which increases the weight and increases the burden on workers.

In view of such problems, the present invention provides a saw tooth that can handle pipelines of multiple thicknesses and that can cut pipelines without damaging the internal cables or contents. It is an object of the present invention to provide a protrusion adjustment device, a saw tooth protrusion adjustment method, and a pipe line cutting method.

In order to solve the above-mentioned problems, a typical configuration of a saw tooth protrusion adjustment device 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; a stopper for sandwiching and fixing the saw in a state in which the teeth of the saw are 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 teeth are inserted, and the saw is fixed by the stopper, thereby removing the saw teeth. The protrusion can be adjusted to be approximately equal to the thickness of the pipeline. Therefore, it is possible to cut the pipeline without the teeth of the saw coming into contact with the power cable housed inside the pipeline, and it is possible to suitably prevent damage to the power cable when the pipeline is cut.

Further, in the above configuration, the gauge plate is formed with a plurality of grooves having different depths. As a result, one gauge plate can be used to adjust the protruding margin of the saw teeth according to the thickness of a plurality of types of pipelines. Therefore, it is possible to deal with pipelines having a plurality of thicknesses with one protruding allowance adjusting device.

The stopper is preferably made of an aluminum-based metal. Aluminum-based metals are soft metals. Therefore, when the saw is sandwiched (tightened) by the stopper and fixed, the back of the saw bites into the stopper, deforming the stopper. As a result, it is possible to prevent the saw from being displaced and to accurately maintain the protruding margin of the teeth.

The ends of the saw may be curved and protrude beyond the edge of the stopper. According to such a configuration, the inner thin wall of the pipeline that remains when the pipeline is cut from the outside by the teeth of the saw 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 will not be damaged. . Therefore, it is possible to more reliably prevent damage to the power cable.

The stopper may have a handle for hooking a finger. This makes it easier to apply force when pulling the saw. Therefore, it is possible to improve the workability when cutting the pipeline using the protrusion adjustment device.

In order to solve the above problems, a representative configuration of the saw tooth protrusion adjusting method according to the present invention is a saw tooth protrusion adjusting method using the saw tooth protrusion adjusting device described above. Then, the teeth of the saw are inserted into the grooves of a predetermined depth among the plurality of grooves of the gauge plate, a stopper is attached to the saw to hold and fix the saw, and the lower end of the stopper is brought into contact with the upper surface of the gauge plate. The structural elements corresponding to the technical concept of the saw tooth protrusion adjustment device described above, which is characterized by fixing the stopper in a fixed state, and the description thereof can also be applied to the saw tooth protrusion adjustment method. .

In order to solve the above problems, a representative configuration of the method for cutting a pipeline according to the present invention is a method for cutting a pipeline at a site where a pipeline housing a cable or an object is installed, comprising: Cut the outer circumference of the section to be cut at two points with a saw while leaving the thin wall, and pierce the remaining thin wall with the edge of the saw to break the thin wall and cut the pipeline into a cylinder. It is characterized in that it is removed from the cable by cutting in the axial direction the lower part of the cut pipe line in a state where the cut pipe line is hung from the cable.

At sites where multiple pipelines are installed, other pipelines are arranged in the vertical and horizontal directions of the pipeline to be cut, so the work space is extremely narrow and cutting work can be performed efficiently. is difficult. Therefore, in the above configuration, the pipeline is cut with a saw using the protrusion adjustment device, leaving the thin wall, and the thin wall is broken to divide the pipeline. Then, the lower portion of the cut pipe line is cut axially while the cut pipe line is suspended from the cable. At this time, if the cut conduit is hung from the cable, a space is created between the cable and the lower part of the conduit. This prevents contact between the saw and the cable when cutting the lower part of the conduit. Therefore, even in a narrow space, it is possible to perform the cutting work satisfactorily without damaging the cable.

According to the present invention, a saw tooth protrusion adjustment device that can handle pipes of multiple thicknesses and can cut pipes without damaging the internal cable or contents, It is possible to provide a saw tooth protrusion adjustment method and a pipeline cutting method.

It is a figure explaining the protruding margin adjustment apparatus of the tooth|gear of a saw concerning this embodiment. 1. It is a figure explaining the protrusion allowance adjustment method of the tooth|gear of a saw using the protrusion allowance adjustment apparatus shown in FIG. It is a figure explaining the spot which needs cutting of a pipeline. FIG. 10 is a diagram for explaining a cutting method when one pipeline is embedded in the pipeline section; It is a figure explaining the cutting method of the pipeline concerning this embodiment. It is a figure explaining the breaking operation|work of thin wall. It is a figure explaining a handle.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

(Saw tooth protrusion adjustment device)
FIG. 1 is a view for explaining a saw tooth protruding allowance adjusting device (hereinafter referred to as protruding allowance adjusting device 100) according to the present embodiment. As shown in FIG. 1 , the protruding allowance adjusting device 100 of this embodiment includes a gauge plate 110 and a stopper 120 . The gauge plate 110 is formed with a plurality of grooves 112a, 112b, 112c, and 112d. Each of the plurality of grooves 112a-112d has a different depth and allows the teeth 102a of the saw 102 to be inserted therein. The depth of the groove (protrusion of sawtooth) is, for example, 3 mm, 3.5 mm, 4 mm, 4.5 mm.

The stopper 120 clamps (tightens) the saw 102 while the teeth 102a of the saw 102 are inserted into the grooves of a predetermined depth among the plurality of grooves 112a to 112d of the gauge plate 110. As shown in FIG. The stopper 120 includes two clamping pieces 122 , and the two clamping pieces 122 are connected by bolts 104 .

(Saw tooth protrusion adjustment device)
FIG. 2 is a diagram for explaining a saw tooth protrusion adjustment method using the protrusion adjustment device 100 shown in FIG. 1 (hereinafter simply referred to as a protrusion adjustment method). In the protrusion margin adjustment method of this embodiment, first, as shown in FIG. Insert tooth 102a. Then, the stopper 120 is attached to the saw 102 .

Next, the bolt 104 is tightened to the nut 106 while the lower end of the stopper 120 is in contact with the upper surface 110a of the gauge plate 110 as shown in FIG. As a result, as shown in FIG. 2(c), the saw 102 is held between the clamping pieces 122 of the stopper 120, and the protruding margin 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 pipeline to be cut is selected, and the teeth 102a of the saw 102 are inserted into the stopper 120. By fixing the saw 102, the protruding margin of the teeth 102a of the saw 102 can be adjusted to be substantially equal to the thickness of the pipeline. Therefore, the pipeline can be cut without the teeth of the saw 102 coming into contact with the power cable accommodated inside the pipeline, and damage to the power cable when the pipeline is cut can be suitably prevented. .

Further, in the gauge plate 110 described above, a plurality of grooves 112a-112d with different depths are formed. As a result, one gauge plate 110 can adjust the protruding margin of the teeth 102a of the saw 102 according to the thickness of a plurality of types of pipelines. Therefore, one protruding allowance adjusting device 100 can be used for pipelines with a plurality of thicknesses.

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 spine of the saw 102 bites into the stopper 120, and the stopper 120 is deformed. As a result, it is possible to prevent the saw 102 from being dislocated and to maintain the protruding margin of the teeth 102a of the saw 102 after adjustment.

Also, the stopper 120 preferably has a handle for hooking a finger. This makes it easier to apply force when pulling the saw. Therefore, it is possible to improve the workability of cutting the pipeline using the protruding allowance adjusting device 100 . Further, as shown in FIG. 1, the end of saw 102 may be curved and project beyond the edge of stopper 120 . This allows the inner thin wall of the pipeline to be broken by the edge of the saw. Details of these will be described later.

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

In the underground wiring shown in FIG. 3( a ), when the power cable 202 is branched at the conduit section 210 , the conduit 204 of the conduit section 210 is cut, and the power cable 202 accommodated inside is newly connected. 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 cutting the conduit 204 so as not to damage the power cable 202 housed inside the conduit 204 .

4A and 4B are diagrams for explaining a cutting method when one pipeline 204 is embedded in the pipeline portion 210. FIG. When the pipeline 204 embedded in the pipeline portion 210 is one (single line), there is no other pipeline above the pipeline 204 . Therefore, a sufficient working space can be secured above the pipeline 204 .

Therefore, when there is one pipeline 204, first, as shown in FIG. cut in the direction As a result, an opening 204b is formed in the upper portion of the conduit 204 as shown in FIG. 4(b). At this time, as shown in FIG. 4(a), since the power cable 202 is positioned at the lower portion of the conduit 204, it is difficult for the power cable 202 to come into contact with the opening 204b in the upper portion 204a.

After the opening 204b is formed in the upper portion of the pipeline 204, a protective material 206 (usually a steel plate) is inserted between the pipeline 204 and the power cable 202 through the opening 204b, as shown in FIG. 4(b). Then, the pipeline 204 is cut by cutting the lower portion of the pipeline 204 with the cutting tool 232 . 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 preferably prevented.

As described above, when there is only one pipeline 204 , it is possible to cut the pipeline relatively easily while preventing damage to the power cable 202 . On the other hand, when there are a plurality of ducts 204 (multiple threads), other ducts may exist above the duct 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. FIG. Therefore, in the present embodiment, even when there are a plurality of conduits 204 (multiple threads), a conduit cutting method is provided that allows the conduits 204 to be cut without damaging the internal power cables 202. offer.

(Method for cutting pipeline)
FIG. 5 is a diagram for explaining a method for cutting the pipeline 204 (hereinafter referred to as a cutting method) according to this embodiment. In the present embodiment, as shown in FIG. 5(a), among the six pipelines 204 arranged in three columns and two rows, the central pipeline 204 in the lower stage is cut. However, it is not limited to this, and the cutting method of this embodiment can be applied regardless of the number of pipelines. Further, in the following description, a cut section (indicated by hatching in FIG. 5A) of the pipeline 204 is referred to as a section 205 .

In the cutting method of the present embodiment, first, the protruding margin of the teeth 102a of the saw 102 is adjusted by the protruding margin adjusting method using the protruding margin adjusting device 100 described above (see FIG. 2). At this time, among the plurality of grooves 112a to 112d of the gauge plate 110, a groove slightly shallower than the thickness of the conduit 204 is selected, and the protruding margin 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. At this time, since the protruding margin of the teeth 102a of the saw 102 is adjusted to be slightly thinner than the thickness of the pipeline 204, the section 205 is cut while leaving a thin wall 205a (see FIG. 6). Therefore, the saw 102 does not come into contact with the power cable 202 when cutting the outer circumference, 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. As shown in FIG. As a result, the thin wall 205a is broken, and as shown in FIG.

FIG. 6 is a diagram for explaining the work of breaking the thin wall 205a. In the protruding allowance adjusting device 100 of the present embodiment, as shown in FIGS. 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 FIG. As a result, as shown in FIG. 6, by inserting the end portion 102b of the saw 102 into the section 205, the inner thin wall 205a remaining when the outer circumference is cut by the teeth 102a of the saw 102 is preferably broken. be able to.

At this time, the end 102b of the saw 102 is curved or blunt. As a result, even if the end 102b of the saw 102 comes into contact with the power cable 202, the power cable 202 will not be damaged. Therefore, damage to power cable 202 can be more reliably prevented.

FIG. 7 is a diagram explaining the handle. As described above, in the protruding margin adjusting device 100 of the present embodiment, the stopper is provided with a handle. Specifically, as shown in FIGS. 2 and 7, by setting the length of the threaded portion 104a of the bolt 104 longer than the thickness of the stopper 120 and the nut, the threaded portion 104a functions as a handle. As a result, as shown in FIG. 7, the operator can hook a finger (illustrated by a dashed line) on the threaded portion of the handle when performing the section cutting operation. As a result, it is possible to improve workability when cutting the pipeline 204 using the protruding allowance adjusting device 100 .

Please refer to FIG. 5 again. After the thin wall 205a of the section 205 is broken as described above, the section 205 (pipe line 204) is suspended from the power cable 202 as shown in FIG. Axial cut by Thereby, the section 205 to be cut can be removed from the power cable 202 .

At this time, as shown in FIG. 5C, by hanging the divided section 205 from the power cable 202, a space is created between the power cable 202 and the lower portion of the section 205. As shown in FIG. This can prevent contact between the saw 102 and the power cable 202 when cutting the lower portion of the section 205 . Therefore, even in a narrow space, the cutting work can be performed satisfactorily without damaging the power cable 202 .

In this embodiment, it was explained that the protruding margin of the teeth 102a of the saw 102 was adjusted to be slightly thinner than the thickness of the pipeline 204. Of the plurality of grooves 112a to 112d of 110, the next deepest groove after the previously adjusted depth may be used to adjust the projection of the teeth 102a of the saw 102. Also, if the thickness of the conduit 204 is unknown, the shallowest groove among the plurality of grooves 112a-112d of the gauge plate 110 is used for adjustment. It is preferable to repeat the operation of adjusting with the next deep groove.

Furthermore, in the present embodiment, the case of cutting the pipeline 204 that accommodates the power cable 202 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 cutting a pipeline accommodating a cable other than the power cable 202 or cutting a pipeline accommodating an object other than the cable.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.
put in a charm

The present invention relates to a saw tooth protrusion adjusting device used for cutting a pipeline buried in the ground, a saw tooth protrusion adjusting method using the saw tooth protrusion adjusting device, and a pipe cutting method. can be used.

DESCRIPTION OF SYMBOLS 100... Protrusion adjustment apparatus 102... Saw 102a... Tooth 102b... End 104... Bolt 104a... Screw part 110... Gauge plate 110a... Upper 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 wall 206 ... protective material 210 ... pipeline section 212 ... cable connection section 214 ... branch connection section 232 ... cutting tool 234 ... sander

Claims (5)

a gauge plate having a plurality of grooves of different depths into which saw teeth can be inserted;
a stopper for sandwiching and fixing the saw with the teeth of the saw inserted into grooves of a predetermined depth among the plurality of grooves of the gauge plate;
A protruding allowance adjustment device for saw teeth, comprising: 2. A saw tooth protruding allowance adjusting device according to claim 1, wherein said stopper is made of an aluminum-based metal. 3. The protruding margin adjustment device for saw teeth according to claim 1, wherein the end of the saw is curved and protrudes from the edge of the stopper. 4. The saw tooth protruding allowance adjusting device according to claim 1, wherein the stopper has a handle for hooking a finger. A saw tooth protrusion adjusting method using the saw tooth protrusion adjusting 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;
Attaching the stopper to the saw for sandwiching and fixing the saw;
A protruding margin adjustment method for saw teeth, wherein the stopper is fixed in a state in which the lower end of the stopper is in contact with the upper surface of the gauge plate.

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