JP2015055285A - Positioning tool for double pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning tool for double pipe capable of realizing its light weight and performing its easy attaching and removal at an optional location of a real pipe.SOLUTION: This invention relates to a double pipe having a real pipe 2 with round section and a protection pipe 3 with round section forming a space around the real pipe 2 to cover it in which a part of a ring having a certain width in a radial direction as seen in its top plan view has a substantial C-shape, a first arc 13 with a short radius of curvature is abutted against an outside part of a side circumferential surface of the real pipe 2, a second arc 14 with a long radius of curvature is abutted against an inside part of a side circumferential surface of the protection pipe 3, a central angle of the first arc 13 exceeds 180 degrees and a center of the round section of the real pipe 2 and a center of the round section of the protection pipe 3 can be coincided to each other.

Description

  The present invention relates to a double pipe having a circular real cross-section pipe for transporting a liquid and a circular cross-section protective pipe covering and forming a space around the real pipe.

  In order to prevent groundwater contamination by the revision of the Water Pollution Control Law, it is necessary to prevent liquid containing harmful substances from leaking from the piping.

  In order to prevent leakage of the liquid containing the toxic substance, there are two circular cross-section pipes for transporting the liquid containing the toxic substance, and a circular cross-section protection pipe covering and forming a space around the real pipe. A heavy piping structure is desirable.

  There exists a thing shown in patent document 1 as such a double piping structure. The double pipe structure of this patent document 1 is a double structure of a real pipe and a protective pipe, and the real pipe is inserted into a through hole in the central portion at an appropriate location, and the peripheral end face is applied to the inner peripheral wall of the protective pipe. The centering spacer which contacts is arranged.

  The double piping structure also has a heat retaining action, an actual pipe deterioration preventing action, and a protective action. Further, the protective tube and the actual tube can be concentrically held by the centering spacer, so that the actual tube is prevented from being bent and vibrated, the strength of the protective tube is increased, and the pressure resistance is improved.

JP 2004-108568 A

  In the above-mentioned double piping structure, the weights of the protective tube and the centering spacer are added to the actual tube as a load, and there is a problem that safety may be affected.

  Further, it is necessary to insert the end portion of the actual pipe into the through hole in the center portion of the centering spacer. Therefore, in the case of attaching to an existing real pipe, there is a problem that it is necessary to temporarily stop the transport of the liquid in the real pipe and disconnect the real pipe once. In addition, for example, when the centering spacer is removed from the actual pipe for maintenance or the like, there is also a problem that it is necessary to temporarily disassemble the pipe by stopping the liquid conveyance in the actual pipe.

  In view of the above, it is an object of the present invention to provide a double-pipe positioning tool that can realize the weight reduction of the double-pipe positioning tool and that can be easily attached to and detached from an arbitrary place of the actual pipe. .

  In order to solve the above-mentioned problem, the double pipe positioning tool according to claim 1 is a double pipe having a circular cross-section of a real pipe and a circular cross-section protective pipe covering and covering the real pipe. A part of the ring having a width in the radial direction in a plan view is substantially C-shaped, and the first arc having a shorter curvature radius contacts the outside of the side peripheral surface of the real pipe, The second arc having the longer radius of curvature is in contact with the inner side of the side peripheral surface of the protective tube, and the central angle of the first arc exceeds 180 degrees, and the center of the circular cross section of the real tube and the protective tube The center of the circular cross section can be made to coincide.

  According to the double pipe positioning tool of claim 1, the double pipe positioning tool is reduced in weight without reducing the accuracy of matching the center of the circular section of the real pipe with the center of the circular section of the protective pipe. it can.

  The double-pipe positioning tool according to claim 2 has elasticity in the double-pipe positioning tool according to claim 1, and abuts the notched portion on a side peripheral surface of the real pipe. Then, the double pipe positioning tool can be fitted into the actual pipe by being pushed toward the actual pipe.

  According to the double pipe positioning tool of the second aspect, the double pipe positioning tool operates in the same manner as the double pipe positioning tool of the first aspect, and can easily be positioned at any location on the side peripheral surface of the actual pipe. A tool can be attached.

  The double pipe positioning tool according to claim 3 is the double pipe positioning tool according to claim 1 or 2, wherein the shortest distance between both ends of the first arc is based on the diameter of the side peripheral surface of the real pipe. It is getting shorter.

  In the double pipe positioning tool according to the third aspect, the double pipe positioning tool is fitted into the real pipe through a process in which both ends of the first arc are pushed and spread on the real pipe. After being fitted, the shortest distance between both ends of the first arc is shorter than the maximum diameter of the side peripheral surface of the real pipe. Therefore, according to the double pipe positioning tool of claim 3, the double pipe positioning tool once fitted into the actual pipe is operated in the same manner as the double pipe positioning tool of claim 1 or 2. If it does not pass through the process by which the both ends of a 1st circular arc are expanded, it will not remove | deviate from the said real pipe.

  The double pipe positioning tool according to claim 4, wherein the radius of curvature of the first arc is the maximum radius of the side peripheral surface of the real pipe. It is shorter.

  The double pipe positioning tool according to claim 4, wherein the radius of curvature of the first arc is shorter than the maximum radius of the side peripheral surface of the real pipe, so that the double pipe positioning once fitted into the real pipe. The tool is urged toward the side peripheral surface of the real pipe while the first arc contacts the outside of the side peripheral surface of the real pipe. Therefore, according to the double pipe positioning tool of the fourth aspect, in addition to acting in the same manner as the double pipe positioning tool of any one of the first to third aspects, The static frictional force with respect to one circular arc becomes large, and the rotation of the double pipe positioning tool and the movement of the actual pipe in the axial direction can be suppressed.

  The double pipe positioning tool according to any one of claims 1 to 4, wherein the double pipe positioning tool is the double pipe positioning tool. A cylindrical part having an axis parallel to the axis of the actual pipe and partly cut away in the circumferential direction in a state of being attached to the pipe, and an axis perpendicular to the axis of the cylindrical part and the axis of the cylindrical part And extending from one end of the cylindrical portion in a direction away from the flange portion, and a flange portion in which a part of the circumferential direction is notched, and the inner surface of the cylindrical portion in plan view In the first arc, the outer periphery of the flange portion corresponds to the second arc in plan view.

  In the double pipe positioning tool according to claim 5 attached to the actual pipe, the inner surface of the cylindrical portion of the double pipe positioning tool contacts the outside of the side peripheral surface of the real pipe. Therefore, according to the double pipe positioning tool of the fifth aspect, in addition to acting in the same manner as the double pipe positioning tool of any of the first to fourth aspects, the double pipe positioning tool abuts on the outside of the side peripheral surface of the actual pipe. Since the area that is used increases, the positioning tool for double piping is stabilized.

  Further, in order to fit the double pipe positioning tool of claim 5 into the actual pipe, when the notched portion of the double pipe positioning tool is brought into contact with the side peripheral surface of the real pipe, The notched portion is in contact with the side peripheral surface of the actual tube, increasing the contact area. Since the pressure applied from the double pipe positioning tool to the actual pipe can be reduced by the increase in the contact area, the double pipe positioning tool according to claim 5 is the one according to any one of the first to fourth aspects. In addition to acting in the same manner as the heavy pipe positioning tool, the surface of the real pipe can be prevented from being damaged when the double pipe positioning tool is fitted into the real pipe.

  According to the invention of claim 1, it is possible to reduce the weight of the double pipe positioning tool. Further, according to the invention of any one of claims 2 to 5, the real pipe is connected without disconnecting it once. It can be easily installed and removed at any location.

It is a top view which shows the positioning tool for double piping of embodiment of this invention. It is a bottom view of the positioning tool for double piping of FIG. It is sectional drawing of the A-A 'sectional line of FIG. It is a longitudinal cross-sectional view of the double piping structure which attached the positioning tool for double piping of FIG. It is a cross-sectional view of the double piping structure which attached the positioning tool for double piping of FIG. It is a longitudinal cross-sectional view of a real pipe which shows the process of attaching the positioning tool for double piping of FIG. 1 to a real pipe.

  Hereinafter, the positioning tool 1 for double piping which is one Embodiment of this invention is demonstrated based on drawing.

  As shown in FIG. 1, the double pipe positioning tool 1 has a substantially C shape in which a part of a ring having a width in the radial direction is cut out in a plan view. The double pipe positioning tool 1 has elasticity.

  As shown in FIGS. 2 and 3, the double pipe positioning tool 1 is attached to the axis of the real pipe 2 in a state where the double pipe positioning tool is attached to the real pipe (see FIGS. 4 and 5). A cylindrical part 11 having a parallel axis and part of the circumferential direction cut away, and continuous from one end of the cylindrical part 11 in a direction perpendicular to the axis of the cylindrical part 11 and away from the axis of the cylindrical part 11 And a flange portion 12 that is formed to extend and is partially cut away in the circumferential direction.

  As shown in FIGS. 1 and 2, the inner surface of the cylindrical portion 11 corresponds to a first arc 13 having a shorter curvature radius in plan view, and the outer periphery of the flange portion 12 has a longer curvature radius in plan view. It corresponds to the arc 14. The central angle of the first arc 13 exceeds 180 degrees.

  Since the central angle of the first arc 13 exceeds 180 degrees, the center of the circular cross section of the actual tube 2 and the center of the circular cross section of the protective tube 3 can be made to coincide with each other in FIG. Furthermore, since the cylindrical part 11 and the collar part 12 are partly cut away, the double pipe positioning tool 1 of the present embodiment can be reduced in weight compared to the ring-shaped centering spacer.

  As shown in FIGS. 4 and 5, the double pipe includes a circular cross-section real pipe 2 and a circular cross-section protection pipe 3 that covers and covers the real pipe 2. The double pipe positioning tool 1 is attached to the actual pipe 2, and the first arc 13 with the shorter curvature radius abuts the outside of the side peripheral surface of the actual pipe 2, and the second with the longer curvature radius. The arc 14 is in contact with the inside of the side peripheral surface of the protective tube 3 so that the center of the circular cross section of the actual tube 2 can coincide with the center of the circular cross section of the protective tube 3.

  As shown in FIGS. 4 and 5, the double pipe positioning tool 1 attached to the actual pipe 2 has a notched portion positioned on the lower side in the gravity direction. The liquid leaked from the actual pipe 2 flows through the notched portion of the double pipe positioning tool 1. Thereby, it becomes easy to collect the liquid stored in the protective tube 3.

  The shortest distance d between both ends of the first arc 13 shown in FIG. 1 is shorter than the maximum diameter of the side peripheral surface of the actual pipe 2. The radius of curvature r of the first arc 13 is shorter than the maximum radius of the side peripheral surface of the real tube 2.

  Furthermore, the double pipe positioning tool 1 attached to the real pipe 2 is in contact with the inner surface of the cylindrical portion 11 of the double pipe positioning tool 1 on the outside of the side peripheral surface of the real pipe 2. Since the area in contact with the outside of the side peripheral surface of the actual pipe 2 increases, the double pipe positioning tool 1 is stabilized.

  Hereinafter, a process of attaching the double pipe positioning tool 1 to the actual pipe 2 will be described with reference to FIG.

  As shown in FIG. 6A, the notched portion of the double pipe positioning tool 1 is brought into contact with the side peripheral surface of the actual pipe 2. Next, as shown in FIG. 6B, the double pipe positioning tool 1 is pushed toward the actual pipe 2. Since the double pipe positioning tool 1 has elasticity, both ends of the first arc 13 of the double pipe positioning tool 1 are pushed and spread along the side peripheral surface of the real pipe 2 by this pushing. Further, when the double pipe positioning tool 1 is pushed further toward the real pipe 2 from FIG. 6B, the double pipe positioning tool 1 is fitted into the real pipe 2 as shown in FIG. 6C. be able to.

  Even when the double pipe positioning tool 1 is removed from the actual pipe 2, the double pipe positioning tool 1 is removed from the real pipe 2 through the processes in the order of (c), (b) and (a) of FIG. Can do.

  In order to fit the double pipe positioning tool 1 into the actual pipe 2, the notched portion of the double pipe positioning tool 1 is brought into contact with the side peripheral surface of the real pipe 2 as shown in FIG. If it does, the part by which the cylindrical part 11 was notched will contact | abut to the side peripheral surface of the real pipe 2, and a contact area will increase. By increasing the contact area, the pressure applied from the double pipe positioning tool 1 to the actual pipe 2 can be reduced, so that the surface of the actual pipe 2 can be prevented from being damaged.

  In the state of FIG. 6C in which the double pipe positioning tool 1 is attached to the actual pipe 2 through the process of FIG. The shortest distance between both ends of the circular arc 13 is shorter than the maximum diameter of the side peripheral surface of the actual pipe 2. Therefore, the double pipe positioning tool 1 once fitted into the actual pipe 2 is not detached from the actual pipe 2 unless it passes through the process of FIG. The state of FIG. 6C in which the heavy pipe positioning tool 1 is attached to the actual pipe 2 is stably maintained.

  Further, as described above, the double pipe positioning tool 1 once fitted into the actual pipe 2 by the curvature radius of the first arc 13 being shorter than the maximum radius of the side peripheral surface of the actual pipe 2 is: The first arc 13 contacts the outside of the side peripheral surface of the real pipe 2 and is urged toward the side peripheral surface of the real pipe 2. The static frictional force between the outside of the side peripheral surface of the real pipe 2 and the first arc 13 is increased, and the rotation of the double pipe positioning tool 1 and the movement of the real pipe 2 in the axial direction can be suppressed. .

  As described above, the double-pipe positioning tool 1 of the present embodiment can be easily attached to and detached from any location on the side peripheral surface of the actual pipe 2.

  With respect to the newly installed real pipe before connection, the work for attaching the double pipe positioning tool 1 can be performed independently of the work for connecting the real pipe 2, so that the work efficiency is improved. Also, the existing pipe 2 in the connected state can be attached with the double pipe positioning tool 1 without having to stop the liquid transport in the pipe 2 and disconnecting the pipe 2 once. Efficiency is improved.

  Furthermore, even when the double pipe positioning tool 1 is removed from the actual pipe 2 for maintenance or the like, the work for removing the double pipe positioning tool 1 can be performed independently of the work of temporarily disconnecting the actual pipe 2, so that the work efficiency is improved. Will improve.

  In the above embodiment, the case of the center angle of the first arc as shown in the drawings has been described. However, the present invention is not limited to this, and the double pipe positioning tool is a ring having a radial width in plan view. If the central angle of the first arc is more than 180 degrees, the first arc is not the center angle of the first arc as shown in the drawing. It may be a central angle.

  Moreover, in the said embodiment, the positioning tool for double piping sticks an elastic body to the 1st circular arc or the 2nd circular arc, and it is elastic between a 1st circular arc and a real pipe, and between a 2nd circular arc and a protective pipe. The body may intervene.

DESCRIPTION OF SYMBOLS 1 Positioning tool for double piping 2 Real pipe 3 Protective pipe 11 Cylinder part 12 Gutter part 13 First arc 14 Second arc

Claims (5)

In a double pipe having a real pipe with a circular cross section and a protective pipe with a circular cross section forming a space around the real pipe,
It has a substantially C-shape with a part of the ring having a width in the radial direction cut out in plan view,
The first arc having the shorter radius of curvature contacts the outside of the side peripheral surface of the real pipe,
The second arc with the longer radius of curvature abuts the inside of the side peripheral surface of the protective tube,
The central angle of the first arc is over 180 degrees,
A double pipe positioning tool characterized in that the center of the circular cross section of the real pipe can be aligned with the center of the circular cross section of the protective pipe. The double pipe positioning tool has elasticity,
The double pipe positioning tool can be fitted into the real pipe by bringing the notched portion into contact with the side peripheral surface of the real pipe and pushing it toward the real pipe. The double pipe positioning tool according to claim 1, wherein the positioning tool is a double pipe positioning tool.   The double pipe positioning tool according to claim 1 or 2, wherein a shortest distance between both ends of the first arc is shorter than a maximum diameter of a side peripheral surface of the real pipe.   The double pipe positioning tool according to any one of claims 1 to 3, wherein a radius of curvature of the first arc is shorter than a maximum radius of a side peripheral surface of the real pipe. The double pipe positioning tool has an axis parallel to the axis of the real pipe and a part in the circumferential direction is notched in a state where the double pipe positioning tool is attached to the real pipe. And a cylindrical portion extending continuously from one end of the cylindrical portion in a direction perpendicular to the axial line of the cylindrical portion and away from the axial line of the cylindrical portion, and a portion in the circumferential direction is notched And has a buttocks
The double pipe according to any one of claims 1 to 4, wherein an inner surface of the cylindrical portion corresponds to the first arc in a plan view, and an outer periphery of the flange portion corresponds to the second arc in a plan view. Positioning tool.

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