JP3198030U - Spacer jig - Google Patents

Abstract

An object of the present invention is to introduce a traction member through a narrow gap between an existing pipe that has been cleaved in the pipe axis direction by a non-cutting method and a new pipe that is covered with the existing pipe to expand and widen the gap. Provided is a spacer jig for excising a part of an opened existing pipe. A spacer jig 1 has a main body portion having a length that widens a gap between an existing pipe 10 and a new pipe 11, and the vertical width is gradually narrowed from the main body portion toward the tip. A pair of left and right side plates 2 having a tip guide portion 4 and a cutting protection arranged at a position where a cutting blade that is horizontally mounted between the pair of side plates 2 and cuts the existing pipe 10 is in contact with the new pipe 11. The member 7 and the bottom portion of the side plate 2 are formed with a latching portion 5 that is latched on the outer periphery of the new pipe 11. [Selection] Figure 2

Description

  This device uses a non-open-cut method (pipe splitter method) to draw a polyethylene pipe of a new pipe into an existing pipe made of steel pipe and refurbish the part of the existing pipe to connect the branch pipe to the new pipe. The present invention relates to a spacer jig used for cutting and an existing pipe cutting method using the same.

2. Description of the Related Art Conventionally, there is known a configuration in which a polyethylene pipe as a new pipe is drawn into a pipe while replacing an existing steel pipe in the direction of the pipe axis using a non-opening method as a correction repair method for gas pipes and the like.
Therefore, since the new pipe is buried with the existing pipe (a cleaved sheath pipe) that has been cut off, the ground at the relevant location is removed when a new branch pipe is connected to the new pipe. It is necessary to excavate and cut the pipe wall of the existing pipe with a predetermined length to expose the new pipe without damaging the new pipe covered with the existing pipe.

For example, in the branch extraction work auxiliary jig of the split sheath pipe in Japanese Patent No. 4634232, an elastic insertion guide piece that can be inserted between the split sheath pipe and the pipe, and the elastic insertion guide piece at one end A pillow member that is attached and forms a flat bag shape when not inflated, and an elastic expansion bag is provided therein, and a pressure supply tube that is pulled out from the other end of the pillow member and supplies pressure to the elastic expansion bag. Provided, the expansion of the pillow member inserted between the cleaved sheath tube and the pipe causes the cleaved sheath tube to be disposed between the cleaved sheath tube and the pipe in a cross section perpendicular to the tube axis. The structure which forms the work space which cut | disconnects and open | releases a branch area is disclosed.
However, in the above configuration, since the pillow member having a flat bag shape and the elastic expansion bag disposed therein is inserted into the gap between the cleavage sheath tube and the pipe, the pillow member needs to be thinned in order to be inserted into the gap. On the other hand, after being inserted into the gap, pressure is supplied to widen the gap between the cleaved sheath tube and the pipe, so even if it is thin, a material that can withstand high pressure and has the strength to lift the cleaved sheath tube. It is necessary to use it, and it is difficult to select and manufacture a material easily.
Further, when cutting the cleaved sheath tube, it is necessary to cut it so as not to damage the pillow member, and a troublesome work is required.
Next, in the spacer jig of JP2011-33052A and the existing tube excision method using the same, an end of a synthetic resin annular body is cut to have elasticity that can be expanded and contracted, and substantially the same as the outer diameter of the new tube. A ring body having an inner diameter set to a length, and a ring-shaped jig formed on a tip guide portion in which at least one of the cut end portions is cut obliquely and gradually becomes thinner toward the end portion. Expand the diameter of the ring body of the jig and externally fit it to the existing pipe, insert the tip guide part into the gap between the existing pipe and the new pipe through the slit opening of the existing pipe, and make the ring body go around to make the new pipe The space between the existing pipe and the new pipe is uniformly formed by external fitting, and the thickness of the ring-shaped jig is set so that the new pipe will not be damaged when the existing pipe is cut with a cutter. The structure to perform is disclosed.
In the above configuration, when the existing pipe is cut as it is, the ring-shaped member has no possibility of protecting the new pipe between the cutter and the new pipe, and thus the new pipe may be damaged by the cutter. .

Japanese Patent No. 4634232 JP 2011-33052 A

This device was devised in view of the above circumstances, and its main problem is
An object of the present invention is to provide a spacer jig that can separate an existing pipe (sheath pipe) that has been cleaved in the direction of the pipe axis from the new pipe and that can reliably cut the existing pipe without being damaged.

In order to solve the above-mentioned problem, in the invention of the spacer jig of claim 1,
A spacer jig for cutting a part of an existing pipe that is inserted and expanded in a gap between an existing pipe that has been cleaved in the pipe axis direction by a non-opening method and a new pipe that is covered with the existing pipe. ,
The right and left spacer jigs have a main body portion having a length that widens the gap between the existing pipe and the new pipe, and a tip guide portion that gradually narrows the vertical width from the main body portion toward the tip. It consists of a pair of side plates and a cutting protection member laid across the intermediate position in the height direction of the pair of side plates,
The bottom portion of the side plate is formed with a latching portion that is latched on the outer periphery of the new pipe.
In the device of claim 2,
The latching portion is composed of an arc-shaped recess that is aligned with an arc surface on the outer periphery centered on the axis of the new pipe, and a pair of corner portions formed at both ends of the recess. .
In the device of claim 3,
The latching portion has at least two arc-shaped recesses with different diameters that match the outer peripheral arc surface around the axis of two new pipes with different diameters, and the recesses share a base end. The portion overlapping the small-diameter concave portion is absorbed by the small-diameter concave portion, and the remaining arc-shaped concave portion of the large-diameter concave portion is formed in the portion beyond the small-diameter concave portion.
In the device of claim 4,
A stepped portion is formed on the upper surface of the side plate 2 so as to hook at least one end of the expanded existing pipe.
In the device of claim 5,
The protection member is composed of a plurality of hook-like members that are horizontally mounted between a pair of side plates.
In the device of claim 6,
The upper surface portion of the side plate protrudes in an arc shape or a curved shape when viewed from the side surface, and a protruding piece protruding upward is provided at the rear end in the insertion direction.
In the invention of claim 7,
A flexible introduction guide member connected to the tip side of the side plate;
The L-shaped piece is provided with a connecting portion for connecting the leading end of the introduction guide member such as the wire to the one L-shaped piece. And a separate traction device having a latching portion that is detachably latched on the cut protection member made of a hook-shaped member.

In this device, the cleavage part is expanded at the planned cutting position of the existing pipe that has been cleaved, and a spacer jig is inserted into and fixed to the new pipe.
The spacer jig regulates the gap between the existing pipe and the new pipe so as to maintain a gap at which cutting work can be performed by the pair of side plates.
In this spacer jig, a cutting protection member is horizontally placed between the pair of side plates, so that when cutting an existing pipe, the cutting blade does not hit the new pipe and the new pipe is not damaged. .
In this way, by using the spacer jig of this device, the space between the existing pipe and the new pipe is enlarged, and they are latched to each other for accurate positioning, and when the existing pipe is cut, the new pipe is protected from damage. can do.

FIG. 1 is a side view of the spacer jig. FIG. 2 is a perspective view showing a state in which the spacer jig is inserted between the existing pipe and the new pipe. FIG. 3 is a side view showing a state where the spacer jig is hooked on a small-diameter new pipe. FIG. 4 is a side view showing a state in which the spacer jig is hooked on a large-diameter new pipe. FIG. 5 is an explanatory view seen from the side when the spacer jig is passed between the existing pipe and the new pipe by the introduction guide member and the pulling member. FIG. 6 is an explanatory view seen from the side showing the cutting state of the existing pipe by the cutting blade. FIG. 7 is a side view of a state in which the spacer jig is hooked on a large-diameter new pipe. It is explanatory drawing which shows the state which expanded and expanded the both ends of the existing pipe which was cleaved.

This device cuts and removes existing pipes (sheath pipes) that were to be used to protect existing new pipes by cutting the existing pipes that had been buried using the non-opening method. A spacer jig that facilitates the construction of the pipe, and the spacer jig can be expanded without damaging the existing pipe when the existing pipe is cut by horizontally mounting a cutting protection member between the pair of side plates. The existing pipe was hung between the existing pipe and the new pipe, and the existing pipe was securely cut while protecting the new pipe.
Preferred embodiments of the present invention will be described below with reference to the drawings.

  The spacer jig 1 of this example was replaced by pulling the new pipe 11 (polyethylene pipe in this example) into the inside while tearing the existing pipe 10 in the pipe axis direction using a known pipe non-cutting method. In the construction of the new pipe 11, the existing pipe 10 that has been torn apart is expanded in the diameter increasing direction, and the existing pipe 10 that has been expanded is cut in a direction that intersects the axial direction of the new pipe 11. It is used in an operation of cutting two places separated by a predetermined length, removing the cut place, and exposing the new pipe 11.

Here, the existing pipe 10 that has been cleaved is expanded in advance at the planned cutting site.
As an example of the configuration to expand, using an expansion tool (not shown) described in Japanese Patent Application No. 2014-55405 developed by the present applicants as an example, Both ends are expanded in the direction of expansion indicated by arrows in the figure to expand (see FIG. 8).

[Spacer jig]
The spacer jig 1 of the present embodiment expands the radial gap S of the new pipe 11 between the existing pipe 10 and the new pipe 11 that are expanded, and includes a pair of left and right side plates 2 and the pair of side plates. It consists of a cutting protection member 7 laid horizontally between the plates 2.

[Side plate]
In the case of the illustrated example, the side plate 2 is made of a plate having a substantially square shape or an arc shape when viewed from the side, and is necessary for the cutting operation of the existing pipe 10 whose diameter is increased in the gap S (see FIG. 8). A main body part 3 having a vertical width for maintaining the existing pipe 10 in an expanded position in order to make a length gap S ′ (see FIG. 3), and a vertical width from the main body part 3 toward the tip And a tip guide portion 4 that gradually narrows the width.

The material of the side plate 2 may be any material such as metal, synthetic resin, wood, or the like that has a strength capable of supporting the existing pipe 10 that has been split on the new pipe 11.
Further, in the illustrated example, the upper surface portion 21 of the side plate 2 is formed in a curved shape or a circular arc shape that continuously extends along the outer periphery of the new tube 11 when viewed from the side surface, and the projecting piece 2A whose rear end jumps upward. It has become.
In the present embodiment, the step portion 15 for hooking one end portion of the existing pipe 10 expanded on the distal end side of the upper surface portion 21 is formed, but the step portion 15 may be omitted.

[Hanging part]
On the bottom surface portion 22 of the side plate 2, a latching portion 5 is formed on the bottom surface in the vicinity of the main body portion 3.
In the present embodiment, the bottom surface portion 22 corresponding to the front end guide portion 4 of the side plate 2 is a front concave portion 23 that is recessed in an arc shape when viewed from the side surface, and the upper surface portion 21 is a circle having a large curvature radius. It protrudes in an arc shape, and the tip portion of the side plate 2 is formed in a taper shape.

An arc-shaped first concave portion 5a is formed on the bottom surface corresponding to the main body portion 3 in the center of the bottom surface portion 22, and a first corner portion 6a is formed at a location in contact with the concave portion 23. The
One end of the first recess 5a becomes the first corner 6a, and the other end becomes the second corner 6b.
The first recess 5a can be positioned by hooking the spacer jig 1 on a small-diameter new pipe 11 (for example, PE pipe 50A) having an outer peripheral surface having the same curvature as the inner peripheral surface (see FIG. 3). ).

In the present embodiment, an arc-shaped second concave portion 5b having a larger curvature radius (large diameter) is formed on the bottom surface portion 22 of the side plate 2 so as to overlap the first concave portion 5a.
That is, the second recess 5b has the first corner 6a as one end common to the first recess 5a, and the other end of the first recess 5a beyond the other second corner 6b. A circular arc portion having a large curvature radius and having a third corner portion 6c is formed.

The portion of the second recess 5b that overlaps the first recess 5a having a small radius of curvature is absorbed by the first recess 5a. Therefore, the portion beyond the corner 6b of the first recess 5a includes the first recess 5A. Thus, the second recess 5b is formed.
In this embodiment, as shown in FIG. 1, the bottom surface portion 22 beyond the second recess 5 b is an arc shape having a larger curvature radius and is a rear recess 24 having the same curvature radius as the front recess 23. The rear part beyond the two recesses 5b may be linear or any other shape, as long as the third corner 6c is formed between the second recess 5b.

Therefore, when the spacer jig 1 is hooked to the large-diameter new pipe 11 (for example, PE pipe 75A), as shown in FIG. 7, it is hooked to the second corner portion 6b and the third corner portion 6c. Thus, the second concave portion 5b is aligned and hooked to the outer periphery of the large-diameter new tube 11, and the spacer jig 1 can be easily positioned.
In the above-described embodiment, the recessed portion for hooking the two new pipes 11 having different diameters is formed as the latching portion 5, but the latching portion 5 has one concave portion or three or more concave portions having different diameters. It may be provided.

In the present embodiment, further, a stepped portion that is hooked on the front end side of the upper surface portion 21 of the side plate 2 and that hangs at least one end of the existing pipe 10 in the insertion direction of the spacer jig 1. A portion 15 is formed.
Thus, the spacer jig 1 can be fixed more reliably because the upper surface portion 21 is hooked to the existing pipe 10 by the step portion 15 and the lower surface portion 22 is hooked to the new pipe 11 by the hook portion 5. .

[Cut protection member]
A cutting protection member 7 is horizontally mounted between the pair of left and right side plates 2 and both ends are fixed to the side plate 2 to form a self-supporting spacer jig 1.
In the case of the present embodiment, the cutting protection member 7 is composed of a plurality of hook-shaped members, and is arranged at substantially equal intervals over the entire region in the length direction near the lower side of the side plate 2.
Here, the bowl-shaped member includes a round pipe, a square pipe, a pipe having any other cross-sectional shape, and a solid bowl material.

In this device, the cutting protection member 7 serves as an obstacle so that a cutting blade C for cutting the existing tube 10 (for example, a blade-shaped blade such as a saver saw) does not come into contact with the new tube 11. It is not limited to a single plate-like member or net-like member (including punching metal) that covers the entire surface between the side plates 2 in a flat, curved, or folded plate shape, and a plate made up of a plurality of divided pieces. The structure may be such that the shaped members and the net-like members are arranged at substantially equal intervals, and in short, any configuration may be used as long as the cutting blade C is provided at a position where the cutting blade C comes into contact with the newly installed tube 11.
Moreover, the cutting | disconnection protection member 7 should just be the structure laid across at least between the left and right side plates 2, and may be spanned vertically and horizontally in the form of a lattice.

[Introduction guide member]
When the spacer jig 1 is inserted into the narrow gap S between the expanded existing pipe 10 and the new pipe 11 (in the radial direction of the new pipe 11), the introduction guide member 8 having flexibility is inserted. It becomes easy to insert the spacer jig 1 into the gap S by connecting to the tip.
The introduction guide member 8 is composed of a flexible thin belt, a wire, a string, a chain, or the like alone or appropriately combined so that it can be inserted into the gap S and pulled out. One end is detachably connected to the front end side of 1.

  Although this connection structure is not ask | required, in the present Example, the axial part 9 which protrudes outward in the downward direction is fixed to the front end side of the pair of side plates 2, and the introduction guide member 8 is fixed to the axial part 9. The loop formed at the base end is hooked and connected, but the base end side is connected to the pipe of the cutting protection member 7 near the tip, or the side plate 2 is drilled in place of the shaft portion 8a. It may be connected through a hole.

[Towing member]
As shown in FIG. 5, the pulling member 18 is formed of a substantially L-shaped pipe. In the illustrated example, the pulling member 18 has a substantially L shape in which an elbow pipe 18c is interposed and fixed between a pair of straight pipes 18a and 18b. It consists of a member.
An annular groove 19 for connecting the leading end side of the wire of the introduction guide member 8 to the one straight pipe 18a is recessed.
Further, a substantially C-shaped hooking portion 17 is provided at the tip of the other straight pipe 18b so as to be detachably hooked to the pipe of the cutting protection member 7 laid horizontally between the side plates 2.

[how to use]
First, the existing pipe 10 that has been cleaved is expanded in the diameter-expanding direction at the planned cutting site.
In the present embodiment, the existing pipe 10 is expanded in the diameter expansion direction using a tool (not shown) such as the expansion tool.

Next, the hooking portion 17 of the pulling member 18 is hooked on a pipe of a cutting protection member (referred to as 7 ′ for explanation) provided behind the side plate 2 (see FIG. 4).
Before and after this, the loop of the proximal end of the introduction guide member 8 is hooked on the shaft portion 9 of the side plate 2 of the spacer jig 1, and is wound around the annular groove portion 19 of the pulling member 18 and tightened with the distal end tensioned. (See FIG. 4).

In this state, when the pulling member 18 is displaced in the rotation direction (counterclockwise in the illustrated example) along the outer periphery of the new pipe 11, the spacer jig 1 is pulled forward by the introduction guide member 8 and the rear is Since it is pushed forward via the latching | locking part 5 (5a or 5b), the existing pipe | tube 10 can be spaced apart from the new pipe | tube 11, the clearance gap S 'can be expanded, and the spacer jig | tool 1 can be inserted (refer FIG. 5).
Here, in the pulling member 18 of the present embodiment, the distal end side of the spacer jig 1 can be gradually pushed into the gap S by utilizing the lever motion with the outer corner of the elbow pipe 18c as a fulcrum. The jig 1 is positioned below the planned cutting position of the existing pipe 10.

When the new pipe 11 has a small diameter, as shown in FIG. 5, the outer peripheral surface thereof is fitted into the first recess 5a without any gap and is hooked by the front and rear first corners 6a and second corners 6b.
At the same time, the spacer jig 1 is securely fixed as described above, with one end of the existing tube 10 hooked to the step 15 on the upper surface of the side plate 2.
And the existing pipe | tube 10 is cut | disconnected from the upper part of the existing pipe | tube 10 with the cutting blade C of cutter apparatuses, such as a saver saw (refer FIG. 6).
At this time, since the protruding piece 2A at the rear end of the side plate 2 protrudes upward, it functions as an identification portion, and the positions of the left and right side plates 2 are clear even from above the existing pipe 10, and the pair of side plates If the existing pipe 10 that has been cleaved and widened in the range between the plates 2 is cut, the cutting blade C will not contact the new pipe 11.

In this manner, the two scheduled cutting portions of the existing pipe 10 are cut, and the cut portions are removed.
The spacer jig set in the new pipe is slid to the direction where the existing pipe is cut off and removed.
The present invention is not limited to the above-described embodiment, and it is needless to say that various design changes can be made without changing the gist of the invention.

DESCRIPTION OF SYMBOLS 1 Spacer jig 2 Side plate 2A Projection piece 3 Main-body part 3a Bottom face part 4 Tip guide part 5 Latching part 5a 1st recessed part 5b 2nd recessed part 6a 1st corner | angular part 6b 2nd corner | angular part 6c 3rd corner | angular part 7 Cutting protection Member 8 Introduction guide member 9 Shaft part 10 Existing pipe 11 New pipe 15 Step part 18 Traction member 21 Upper surface part 22 Bottom part C Cutting blade S Gap S 'Gap

Claims (7)

A spacer jig for cutting a part of an existing pipe that is inserted and expanded in a gap between an existing pipe that has been cleaved in the pipe axis direction by a non-opening method and a new pipe that is covered with the existing pipe. ,
The right and left spacer jigs have a main body portion having a length that widens the gap between the existing pipe and the new pipe, and a tip guide portion that gradually narrows the vertical width from the main body portion toward the tip. It consists of a pair of side plates and a cutting protection member laid across the intermediate position in the height direction of the pair of side plates,
A spacer jig characterized in that a latching portion that is latched on the outer periphery of a new pipe is formed on the bottom surface of the side plate.   The latching portion is composed of an arc-shaped concave portion that aligns with an arc surface on the outer periphery centering on the axis of the new pipe, and a pair of corner portions formed at both ends of the concave portion. Item 2. A spacer jig according to Item 1.   The latching portion has a plurality of arc-shaped recesses with different diameters that match the arc surface of the outer periphery centering on the axis of two new pipes with different diameters, and the recesses have a common base end, The portion overlapping the small-diameter concave portion is absorbed by the small-diameter concave portion, and the remaining arc-shaped concave portion of the large-diameter concave portion is formed in the portion beyond the small-diameter concave portion. The spacer jig described.   The spacer jig according to any one of claims 1 to 3, wherein a stepped portion is formed on an upper surface of the side plate to hook at least one end of the expanded existing pipe.   The cutting protection member is composed of a plurality of hook-like members horizontally mounted between a pair of side plates, and the hook-like members are arranged at intervals at which the cutting blade does not pass. 4. The spacer jig according to any one of 3.   The upper surface portion of the side plate protrudes in an arc shape or a curved shape when viewed from the side surface, and a protruding piece protruding upward is provided at the rear end in the insertion direction. The spacer jig described in 1. A flexible introduction guide member connected to the tip side of the side plate;
The L-shaped piece is provided with a connecting portion for connecting the leading end of the introduction guide member such as the wire to the one L-shaped piece. A spacer according to any one of claims 1 to 6, further comprising a separate traction device having a latching portion that is detachably latched on the cut protection member made of a hook-shaped member. jig.

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