JP5850668B2 - Fluid pipe cutting method - Google Patents

Description

  The present invention relates to a fluid pipe cutting method for cutting a fluid pipe made of resin.

  Conventionally, when connecting a joint by cutting into an existing fluid pipe made of resin, for example, a drilling device generally configured by a cutter member that rotates integrally with a screw portion is used, and the cutter member is moved by rotating the screw portion. Screw into the outer surface of the fluid tube to drill. However, in this method, the burden at the time of drilling may increase due to the frictional force generated between the cutter member and the fluid pipe. Therefore, the screw part and the cutter member are provided separately, and they are connected so as to be relatively rotatable with respect to the shaft core, and the cutter member is pressed against the outer surface of the fluid pipe by the rotation of the screw part while being prevented from rotating. As a result, the friction force between the cutter member and the fluid pipe can be reduced, and the load during drilling can be reduced. (For example, refer to Patent Document 1).

JP-A-5-177597 (2nd page, FIG. 1)

  However, in the drilling method described in Patent Document 1, since the fluid pipe is made of resin, it has a property of being easily bent by the pressing of the cutter member, and the fluid pipe may be deformed.

  The present invention has been made paying attention to such problems, and provides a fluid pipe cutting method that prevents deformation of the cross-sectional shape of a fluid pipe by pressing a cutter member that cuts the fluid pipe made of resin. With the goal.

In order to solve the above problems, a fluid pipe cutting method of the present invention comprises:
A fluid pipe cutting method for cutting a fluid pipe in a housing that is hermetically attached to the outer surface of a resin fluid pipe,
The thickened portion is fused along the circumferential direction of the outer periphery of the fluid pipe, and the cutter member is non-rotated toward the outer peripheral surface of the fluid pipe in a housing attached to accommodate the thickened portion inside. in pressing to is characterized by cutting over said fluid tube entire cross section.
According to this feature, the fluid pipe can be cut by pressing the cutter member in a state where the strength of the fluid pipe is reinforced by first forming a thick part on the outer periphery of the fluid pipe made of resin. Deformation of the fluid pipe caused by pressing of the cutter member during cutting can be prevented.

The fluid pipe cutting method of the present invention comprises:
The thick portion is provided in at least two places apart from each other in the tube axis direction of the fluid pipe, and the thick portion is cut by the cutter member .
According to this feature, the cutter member cuts between at least two thick portions that are spaced apart in the tube axis direction of the fluid tube, so that deformation of the fluid tube caused by pressing of the cutter member during cutting is prevented. Can do.

The fluid pipe cutting method of the present invention comprises:
The cutter member is to leave the thick portion in the axial direction of the tube on both sides of the cutter member, it is characterized that you cut the fluid pipe together with the thick wall portion.
According to this feature, by arranging the thick part in the casing, positioning when the casing is attached to the fluid pipe is facilitated, and after the fluid pipe is cut, the thick part is inside the casing. It can be caught on the side surface to prevent the fluid pipe from coming off.

The fluid pipe cutting method of the present invention comprises:
It is characterized in that at least a part of the thick part located on the outer periphery of the fluid pipe is accommodated in a recess provided in the casing.
According to this feature, at least a part of the thick part located on the outer periphery of the fluid pipe is accommodated in the concave part provided in the casing, whereby at least a part of the thick part is provided in the casing. The strength against the pressing force of the cutter member at the time of cutting is supported by the inner surface, and deformation of the fluid pipe caused by pressing of the cutter member at the time of cutting can be prevented.

FIG. 3 is a side sectional view showing a state in which a ring member is arranged in the fluid pipe in the first embodiment. It is a front sectional view showing a state where a ring member is arranged in a fluid pipe. It is a sectional side view which shows the whole image which attached the case and the cutting device to the fluid pipe | tube. It is a sectional side view which shows a mode that the valve apparatus was attached after the fluid pipe | tube cutting | disconnection. It is a sectional side view which shows the whole image which attached the case and the cutting device to the fluid pipe | tube in Example 2. It is a sectional side view which shows the whole image which attached the case and the cutting device to the fluid pipe | tube in Example 3. It is a sectional side view which shows the whole image which attached the case and the cutting device to the fluid pipe | tube in Example 4.

  The form for implementing the fluid pipe | tube cutting method which concerns on this invention is demonstrated below based on an Example.

  A fluid pipe cutting method according to the first embodiment will be described with reference to FIGS.

  As shown in FIG. 3, in the fluid pipe cutting method of the present invention, after forming the thick portions 4 and 4 'on a part of the outer periphery of the fluid pipe 1 to be described later, the clean water mainly flows inside and is substantially horizontal. A case 2 as a housing covering the outer periphery of the fluid pipe 1 extending in the direction in a sealing manner, and a cutting device 6 detachably attached to the case 2 and provided substantially perpendicular to the fluid pipe 1 This is a fluid pipe cutting method in which the fluid pipe 1 is cut by pressing the cutter member 62 of the cutting device 6.

  The fluid pipe 1 of the present embodiment is composed of a high-density polyethylene pipe that is a resin pipe formed in a substantially circular shape in cross section. The material of the fluid pipe 1 is not limited to high-density polyethylene, and may be other heat-bondable material made of polyolefin resin or predetermined resin. In the present embodiment, the fluid in the fluid pipe 1 is clean water, but the fluid flowing in the fluid pipe 1 is not necessarily limited to clean water, and may be, for example, industrial water, or may be gas or gas-liquid. It may be the fluid pipe 1 through which the fluid in the mixed state flows.

  As shown in FIGS. 1 and 2, ring members 41 and 42 that can be divided into two in the radial direction of the fluid pipe 1 are disposed on the outer surface of the fluid pipe 1. Inside the ring members 41 and 42, a heating wire 411 is provided as a heating unit that generates heat when a current flows. Each end of the heating wire 411 is connected to connection portions 41a and 42a provided on the outer surfaces of the ring members 41 and 42 so as to be electrically connected to an external power supply line (not shown). Similarly, the outer surface of the fluid pipe 1 that is separated from the ring members 41 and 42 by a predetermined length in the tube axis direction has the same structure as that of the ring members 41 and 42, and a heating wire 411 ′ is provided in the inside. Ring members 41 ′ and 42 ′ in which each end portion of the heat wire 411 ′ is connected to a connection portion provided on the outer surface are arranged. The material of the ring members 41, 42, 41 ′ and 42 ′ is not limited to high-density polyethylene, but may be other heat-bondable materials made of polyolefin resin or a predetermined resin, but made of the same material as the fluid pipe. Preferably there is. Moreover, you may use a metal for one part as a reinforcement member of ring member 41,42,41 ', 42'. Furthermore, the ring member may be divided into three or more.

  As shown in FIG. 3 and FIG. 4, a case 2 is hermetically attached to the outer peripheral surface of the fluid pipe 1, so that it is possible to work on the existing fluid pipe 1 in an indefinite water state. . In this embodiment, the case 2 can be divided into two in the radial direction. The case 2 covers the existing fluid pipe 1 and is connected and fixed by a flange, bolt and nut not shown here. ing. Further, a flange is provided on the upper portion of the case 2 so that it can be connected to a cutting device 6 and a valve device 16 described later. Furthermore, an inner space 15 is provided inside the case 2 in a vertical direction substantially orthogonal to the tube axis of the fluid tube 1, and a cutter member 62 in a cutting device 6 to be described later can be inserted, and a fluid to be described later A valve device 16 to be installed after the tube 1 is cut can be installed. Case 2 is not limited to two divisions, and may be divided into a plurality of divisions such as three divisions.

  Next, a description will be given in the order of steps of the fluid pipe cutting method. As shown in FIG. 3, first, the ring members 41 and 42 are fitted onto the outer surface of the fluid pipe 1, and the inner surfaces of the ring members 41 and 42 and the fluid pipe 1. Contact the outer surface. Next, a power cable connected to an external power source (not shown) is connected to each connection portion 41a, 41a, and power is supplied from the external power source for a predetermined time. The heating wire 411 supplied with power generates heat to a high temperature, whereby the inner surfaces of the ring members 41 and 42 and the outer surface of the fluid pipe 1 are heated and gradually melted.

  The inner surfaces of the melted ring members 41 and 42 and the outer surface of the fluid pipe 1 are fused with each other, and the heat generation by the heating wire 411 is stopped and the temperature is lowered to room temperature, so that they are integrated and solidified, that is, thermally fused. A thick portion 4 is formed on a part of the outer surface of the fluid pipe 1 by heat fusion between the inner surfaces of the ring members 41 and 42 and the outer surface of the fluid pipe 1. In addition, by the same process as described above, the ring members 41 ′ and 42 ′ that are separated from the thick portion 4 by a predetermined length in the tube axis direction and are externally fitted to the outer surface of the fluid pipe 1 are thermally fused, A thick part 4 'is formed.

  Next, the fluid pipe 1 is covered with the case 2 so that the thick parts 4 and 4 'formed in a part of the pipe are located in the inner space part 15, and then the case 2 and the cutting device 6 are It is connected by a nut 8.

  Since the case 2 contains a sealing material 10 (for example, packing) and is in a sealed state, the fluid can be prevented from leaking to the outside when the pipe is cut, and the fluid in the fluid pipe 1 is in an uninterrupted flow state. It becomes possible to work. Further, since the thick portions 4 and 4 ′ are located in the inner space portion 15, the thick portions 4 and 4 ′ are caught by the inner side surface 15 a that forms the inner space portion 15 of the case 2 after the fluid pipe 1 is cut. The fluid pipe 1 can be prevented from coming off.

  After the installation of the case 2 to the fluid pipe 1 is completed, a push ring 5 for connecting the fluid pipe 1 and the case 2 is attached to both ends of the case 2 in the axial direction of the fluid pipe 1. The lock ring 11 disposed on the inner peripheral surface of the pusher wheel 5 is made of a material harder than the fluid pipe 1 (for example, a resin such as metal or polyacetal) and is configured to be divided into two or more. When the case 2 and the press ring 5 are tightened until they are in contact with the T-head bolt 9 and the nut 12, the lock ring 11 moves in the direction of the case 2 along with the movement of the press ring 5, and the blade 11a of the lock ring 11 is moved along with this movement. The fluid pipe 1 bites into the surface of the fluid pipe 1 and is fixed to the case 2 integrally with the lock ring 11, and has an action of preventing the fluid pipe 1 from coming out when a withdrawal force is applied to the fluid pipe 1.

  The surface (flange) where the upper end of the opening communicating with the inner space 15 of the case 2 and the cutting device 6 are joined has an O-ring embedded inside the bolts and nuts 8 that connect each other. 2 and the cutting device 6 are connected in a sealed manner. The cutting device 6 includes a shaft member 61 that is connected to a driving means (not shown) and extends in the axial direction toward the fluid pipe 1, and a sharp cutting blade 62 a that is fixed to the tip of the shaft member 61 and cuts the fluid pipe 1. The cutter member 62 is mainly composed of the cover member 13 and the work valve 7. The cutter member 62 extends in the axial direction to approach the outer surface of the fluid pipe 1 and press the cutting blade 62a. The fluid pipe 1 is cut by this.

  When the cutter member 62 approaches and cuts the outer surface of the fluid pipe 1, the side end of the cutter member 62 is in the vicinity of the thick portions 4, 4 ', that is, one thick portion 4 and the other thick portion. 4 ′ is cut by the cutter member 62. According to this, in the state where the strength of the fluid pipe 1 is reinforced by forming the thick portions 4 and 4 ′ on a part of the outer periphery of the fluid pipe 1 made of resin, Since the pipe 1 can be cut, it is possible not only to prevent deformation due to the pressing of the cutter member 62 on the cut surface when the fluid pipe 1 is cut, but also to prevent deterioration of the sealing performance in the case 2 due to bending deformation of the fluid pipe 1. Can do.

  In addition, since the fluid pipe 1 can be cut in a state where the fluid pipe 1 is not continuously flowed in the case 2 in which the outer surface of the fluid pipe 1 is hermetically attached, the fluid pipe 1 can be cut using the existing case 2. The cutting operation can be performed without stopping the use of 1.

  Further, it is set so that the cutter member 62 cuts between the thick part 4 and the other thick part 4 ′, and the thick parts 4, 4 ′ are arranged in the inner space 15 of the case 2. Therefore, it is easy to determine the mounting position of the case 2 with respect to the fluid pipe 1, and after the fluid pipe 1 is cut, the thick portions 4 and 4 'are caught on the inner surface 15a of the case 2, Even the thick portion 4 alone can prevent the fluid pipe 1 from coming off. Furthermore, when the positioning of the case 2 is completed, the cutting position by the cutter member 62 is also arranged in the inner space portion 15, and the cutting position by the cutter member 62 can be easily adjusted.

  After cutting by the cutting device 6, the cutter member 62 and the shaft member 61 are lifted upward, the work valve 7 is closed to stop the water, and then the valve device 16 is connected instead of the cover body 13. A gate valve 17 that is a fluid control is connected to the fluid pipe 1. Finally, the valve lid 18 and the case 2 are connected, and the installation of the valve device 16 is completed. In addition, as a fluid control, you may comprise a butterfly valve, an emergency cutoff valve, a switching valve, or a plug, for example.

  Next, a fluid pipe cutting method according to the second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the same component as the component shown by the said Example 1, and description is abbreviate | omitted about the overlapping structure.

  As shown in FIG. 5, the thick portion 14 is configured to externally fit the outer surface of the fluid pipe 1 with a substantially cylindrical resin pipe that can be divided into two or more in the radial direction. It is heat-sealed with the outer surface of the fluid pipe 1 by heating of the provided heating wire, and is formed in a substantially cylindrical shape.

  Following the formation of the thick portion 14, the case 2 is arranged so that the thick portion 14 is positioned in the inner space 15. At this time, the thick portion 14 is connected to the fluid pipe 1 positioned in the inner space 15. Since it is formed in the substantially full length of the outer surface, when the fluid pipe 1 is cut, the cutter member 62 cuts the entire thick portion 14. That is, since the cutter member 62 cuts the entire thick portion 14, the cutter member 62 is pressed and cut in a state where the cut portion of the fluid pipe 1 is reinforced as a whole. It is possible to effectively prevent the portion remaining on the case 2 side from being deformed by the pressing of the cutter member 62. Further, since the cut portion of the fluid pipe 1 and the entire periphery thereof are reinforced by the thick portion 14, the fluid pipe 1 itself is also prevented from being bent and deformed by the pressing of the cutter member 62, and the fluid pipe 1 and the case 2. There is no fear that the fluid will leak outside.

  Furthermore, since the cylindrical thick portion 14 is formed over substantially the entire length of the fluid pipe 1 located in the inner space portion 15, the thick portion 14 necessary for cutting the vicinity of the thick portion 4 by the cutter member 62. And the position setting of the cutter member 62 can be simplified. Therefore, when the case 2 is installed in the fluid pipe 1, it is only necessary to install the thick portion 14 in the inner space 15 of the case 2, so that the positioning of the case 2 can be easily positioned.

  Next, a fluid pipe cutting method according to Embodiment 3 will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the same component as the component shown by the said Examples 1 and 2, and description is abbreviate | omitted about the overlapping structure.

  As shown in FIG. 6, ring-shaped recesses 2 d and 2 d are provided along the tube axis direction of the fluid pipe 1 on the inner surface forming the inner space 15 of the case 2. A part of each thick part 24 is accommodated in the recess 2d. At this time, since a part of the outer peripheral surface 24a of the thick part 24 is disposed so as to contact the bottom surface 2e of the recess 2d, at least a part of the outer peripheral surface 24a of the thick part 24 is a case when the fluid pipe 1 is cut. 2 is supported by the bottom surface 2e of the concave portion 2d provided in 2, and the strength against the pressing force of the cutter member 62 at the time of cutting can be increased. Therefore, the pressing force by the cutter member 62 applied to the fluid pipe 1 at the time of cutting can be distributed to the case 2 through the thick part 24, and the deformation of the cut surface of the fluid pipe 1 can be prevented. It is possible to effectively prevent a decrease in the sealing performance in the case 2 due to the bending deformation of the fluid pipe 1.

  Further, since the concave portion 2d of the case 2 covers a part of the thick portion 24, even if the fluid pipe 1 is pulled out after the fluid pipe 1 is cut, the inner surface 2f of the concave portion 2d is thick. By being caught by the portion 24, it can be prevented from coming out. In the present embodiment, the recess 2d provided in the case 2 is shown to communicate with the inner space 15, but is not limited thereto. For example, the shape of the recess provided in the case 2 may be any shape as long as at least the lower part of the outer surface 24a of the thick portion is supported by the case 2. Furthermore, the present invention is not necessarily limited to the case where only a part of the thick part is accommodated in the recess, and for example, most of the thick part or all of the thick part may be accommodated in the recess.

  Next, a fluid pipe cutting method according to Embodiment 4 will be described with reference to FIG. The same reference numerals are given to the same components as those shown in the first to third embodiments, and the description of the overlapping components will be omitted.

  As shown in FIG. 7, similar to the above embodiment, heating wires are provided inside the ring members, respectively, and by passing a current through the heating wires, the inner surface of the ring member and the outer surface of the fluid pipe 1 are heated. Thick portions 34 and 34 ′ are formed by being gradually melted and thermally fused to each other. In the case 2, recesses 20, 20 that open toward the fluid pipe 1 outside the inner space 15 have substantially the same shape or a slightly larger shape than the thick portions 34, 34 ′ formed in the fluid pipe 1. It is formed, and the formation position of the thick portions 34 and 34 ′ is set so as to be accommodated in the recesses 20 and 20. Further, when the fluid pipe 1 is cut, the case 2 is installed so that the thick portions 34, 34 'are accommodated in the recesses 20, 20, so that the thick portions 34, 34' are vertically moved in the recesses 20, 20. It is possible to prevent movement to the left and right. Accordingly, since the case 2 and the fluid pipe 1 are firmly fixed, the fluid pipe 1 is deformed by the pressing of the cutter member 62 when the fluid pipe 1 is cut and the inside of the case 2 is sealed by the bending deformation of the fluid pipe 1. It is also possible to effectively prevent a decrease in sex. In addition, after the fluid pipe 1 is cut, the thick portions 34 and 34 'are accommodated in the recesses 20 and 20, so that it is possible not only to prevent the fluid pipe 1 from coming out even if a withdrawal force is applied to the fluid pipe 1. Further, excessive insertion of the fluid pipe 1 in the direction of the inner space 15 can also be prevented.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the said Example, the aspect by which the thick part is formed in the outer surface of the fluid pipe | tube 1 in case 2 in one place or two places, or the thick part is formed in the tubular shape over the circumferential direction. Although the aspect is described, the aspect of the thick part is not limited to this, and the thick part may be attached to the fluid pipe 1 located outside the case 2, A plurality of locations may be provided in the circumferential direction.

  Moreover, in the said Example, although the existing fluid pipe | tube 1 into which the fluid has flowed inside is sealed with the case 2, the aspect which cut | disconnects the fluid pipe | tube 1 in the case 2 in an uninterrupted flow state is demonstrated. If it cut | disconnects this fluid pipe | tube, it will not be restricted to the cutting | disconnection in an uninterrupted flow state, For example, the aspect which cut | disconnects the fluid pipe | tube before installation independently etc. can be used in various ways.

1 Fluid pipe 2 Case (housing)
2d Concave part 4, 4 'Thick part 6 Cutting device 13 Cover body 14 Thick part 15 Inner cavity part 20 Concave part 24, 24' Thick part 34, 34 'Thick part 62 Cutter member 62a Cutting blade

Claims (4)

A fluid pipe cutting method for cutting a fluid pipe in a housing that is hermetically attached to the outer surface of a resin fluid pipe,
The thickened portion is fused along the circumferential direction of the outer periphery of the fluid pipe, and the cutter member is non-rotated toward the outer peripheral surface of the fluid pipe in a housing attached to accommodate the thickened portion inside. fluid pipe cutting method characterized by cutting over said fluid tube full section in pressing to. 2. The fluid pipe cutting according to claim 1 , wherein the thick part is provided in at least two places apart from each other in the pipe axis direction of the fluid pipe, and the thick part is cut by the cutter member. Method. The cutter member is to leave the thick portion in the axial direction of the tube on both sides of the cutter member, the fluid tube according to claim 1 or 2, characterized that you cut the fluid pipe together with the thick wall portion Cutting method. The fluid pipe cutting method according to any one of claims 1 to 3, wherein at least a part of the thick part located on an outer periphery of the fluid pipe is accommodated in a recess provided in the casing.

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