JP2012085418A - Duct spacer and fixing method of flexible tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a duct spacer which prevents projection of a flexible tube to the manhole side from the inside of a duct, and to provide a method for fixing a flexible tube.SOLUTION: The duct spacer 50 for fixing a flexible tube comprises a first disk 53 having a leg 55 being fitted in the mouth of a duct, a grip metal 52 provided on the outer periphery of a flexible tube 110 and fixing the flexible tube 110, and a second disk 51 for connecting with the first disk 53 at a predetermined interval so as to clamp a grip metal 52 by using the first disk 53. The duct spacer 60 for fixing a flexible tube comprises a third disk 10 having a leg being fitted in the mouth of a duct, and a guide 61 connected to the leg 15 of the third disk 10 and guiding the flexible tube 110.

Description

  The present invention relates to a duct spacer and a flexible pipe fixing method to be installed in a duct opening of a manhole, and in particular, when a plurality of cables such as a metal cable and an optical fiber cable are accommodated in one pipe line, the cables are separated and protected. The present invention relates to a duct spacer and a flexible tube fixing method for fixing a cable protecting flexible tube at a manhole duct port.

  At present, a duct sleeve 80 (a pipe connecting pipes between manholes) is installed at the manhole duct opening of the pipe (see FIG. 7), and at least one cable protection flexible cable laid in the pipe is provided. In order to fix the tube at the manhole duct opening, a synthetic resin disk-shaped molded article duct spacer is provided.

  As a conventional duct spacer for a cable protecting flexible tube, for example, a synthetic resin molded product, a cable protecting flexible tube duct spacer composed of a pair of left and right semi-discs that can be coupled to each other at both ends, is used. Known (see, for example, Patent Documents 1 and 2). In the duct spacer disclosed in Patent Document 1, corresponding circular arc surface portions are respectively provided so that insertion holes of the flexible tube for cable protection can be formed between the opposing surface portions when both the semi-discs are joined in a disk shape. In addition, fixed legs that are curved along the same circumferential surface protrude from the back surfaces of both semicircular discs, and cross the length direction of the fixed legs on the outer surface of each fixed leg. In this state, the crimping pieces projecting in a fin shape are juxtaposed.

  The duct spacer 10 of this disk-shaped molded article is composed of a pair of left and right semi-disks 11 and 21 that can be combined in a disk shape. A plurality of circular arc surface portions 12 and 22 are provided so that they can be formed, and male and female coupling portions 13 and 23 are provided at both end portions 11a and 21a of the half discs 11 and 21, respectively. And the fixed legs 14 and 24 which curved along the same circumferential surface are each protrudingly provided in the back surface parts 11b and 21b of both semi-discs 11 and 21, and on the outer surface part of each fixed leg 14 and 24, respectively. Has a large number of crimping pieces 15 and 25 jutting out in a fin shape in a state of crossing with the length direction of the fixed legs 14 and 24, and these crimping pieces 15 and 25 are given elasticity at the time of molding. (See FIG. 8).

  By inserting a flexible tube into the duct spacer 10 of the conventional flexible tube for protecting a cable and using a gripping bracket in which the flexible tube is tightened with a bolt and a nut, the force and flexibility of the flexible tube to be contracted can be reduced. It is possible to prevent the flexible pipe generated by the residual tension and creeping force when laying the pipe from gripping the force to move from the manhole side to the duct side and to be drawn into the pipe line.

  A technique in which a plurality of ears are provided as a device for preventing such a gripping fitting from being pulled into the pipe is known (for example, see Patent Documents 3 and 4).

Japanese Patent No. 3981938 Japanese Utility Model Publication No. 7-29695 Japanese Patent Laid-Open No. 2000-184568 Japanese Utility Model Publication No. 63-58837

  Although the conventional duct spacer can prevent the flexible tube for cable protection from being pulled into the duct even if a gripping fitting is used, the extension force due to the heat of the flexible tube, the residual tension when laying, There was no function to prevent the flexible tube from projecting from the inside of the pipeline to the manhole side caused by creeping force or the like.

  For this reason, for example, the conventional technology is applied to sections with a large temperature change range compared to underground sections in pipe sections such as bridge sections where the pipe is exposed to the open air or exposed to direct sunlight. If an attempt is made, the flexible tube has a high thermal expansion due to the material properties, and the flexible tube for protecting the cable extends greatly, affecting the cable accommodated in the same conduit and other cables in the manhole. Therefore, a flexible tube cannot be used, and a plurality of cables cannot be accommodated in one pipe line.

  In order to solve the above problem, when the flexible tube is completely fixed at both ends of the manhole duct so as to suppress the expansion and contraction of the flexible tube for protecting the cable, the flexible tube meanders in the conduit, and enters the flexible tube. Since there is a possibility of affecting cable laying, there has been a demand for a technique for fixing the flexible tube without suppressing the protrusion of the flexible tube.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a duct spacer and a flexible tube fixing method that prevent the flexible tube from protruding from the inside of the conduit toward the manhole. To do.

  That is, the duct spacer for fixing a flexible tube of the present invention is provided on the outer periphery of the first disk portion having a leg portion to be fitted to at least a duct opening having an insertion hole through which the flexible tube can be inserted. At least a flexible tube that is connected to the first disk portion at a predetermined interval so as to sandwich the gripping metal fitting with the holding metal fitting for fixing the flexible tube and the first disk portion can be inserted. And a second disk part having an insertion hole.

  In the flexible tube fixing duct spacer of the present invention, an installation space for the gripping metal fitting is ensured in the longitudinal direction of the flexible tube in order to connect the first disk portion and the second disk portion. It is characterized by comprising an adjustable connecting part.

  In the flexible tube fixing duct spacer according to the present invention, the first disk portion has a plurality of legs, each of which has a protrusion, and the protrusion is provided at the duct opening. It is characterized by being configured to fit into the recess of the duct sleeve.

  In the flexible tube fixing duct spacer of the present invention, the flexible tube is fixed by the first disk portion, the second disk portion, and the holding metal fitting, and the leg portion of the first disk portion is fixed. The flexible pipe fixing duct spacer is fixed by fitting the protrusion with the concave portion of the duct sleeve provided at the duct opening, and the flexible pipe protrudes from the inside of the pipe line to the manhole side. It is configured to prevent.

  Furthermore, the duct spacer for a flexible tube guide according to the present invention includes a third disk portion having a leg portion fitted into a duct port having an insertion hole through which at least the flexible tube can be inserted, and the third disk portion. And a guide part for guiding the flexible tube connected to the leg part.

  Further, in the duct spacer for a flexible tube guide according to the present invention, the guide portion has one or more semicircular structures continuous in the longitudinal direction of the flexible tube, and the flexible tube is arranged on the guide portion. The flexible tube is made movable so that the end portion stays.

  Further, in the duct spacer for a flexible tube guide according to the present invention, a male and female coupling portion is provided at each end of the guide portion, and the entire length of the guide portion is extended by connecting the extension guide portion. It is possible to do it.

  Furthermore, in the flexible tube fixing method of the present invention, the flexible tube is fixed at one manhole duct port in one line by the flexible tube fixing duct spacer of the present invention, and the flexible tube fixing method is used. The step of fixing the duct spacer to the duct sleeve, and the flexible tube can be freely expanded and contracted at the other manhole duct port in the conduit by the flexible tube guide duct spacer of the present invention, and the flexible tube Opening the end of the flexible tube so that the end of the tube can remain in the conduit.

  According to the present invention, a duct spacer and a cable protecting flexible tube fixing method having an extension control function of a cable protecting flexible tube are provided, and a plurality of cables accommodated in a pipeline are connected to each other by a guide portion. It can be separated and protected, and the extension of the flexible tube for protecting the cable can be stopped inside the pipeline. For this reason, even when the flexible tube is greatly extended, the cable in the conduit and the cable in the manhole are not affected, and the flexible tube for protecting the cable can be used even in a conduit having a large temperature fluctuation. Therefore, a plurality of cables can be accommodated in one pipe line even in a bridge installation section or the like.

It is the schematic which applied the duct spacer for flexible tube fixation and the duct spacer for flexible tube guide of the flexible tube for cable protection of one Embodiment concerning this invention to the pipe line. It is a schematic block diagram of the duct spacer for flexible tube fixation of one Embodiment which concerns on this invention. It is a perspective view of the duct spacer for flexible tube fixation of one embodiment concerning the present invention. (a) is a front view of the duct mouth side disk part of the duct spacer for flexible tube fixation of one embodiment concerning the present invention, and (b) is for flexible tube fixation of one embodiment concerning the present invention. It is a side view of the duct mouth side disk part of a duct spacer. It is a schematic block diagram of the duct spacer for flexible tube fixation of one Embodiment which concerns on this invention. (a), (b), (c) is a schematic block diagram of the guide part of the duct spacer for flexible tube fixation of one Embodiment concerning this invention. It is a figure which shows the structure of the existing duct sleeve in the manhole opening of a pipe line. It is a figure which illustrates the duct spacer of the disk-shaped molded article from the former.

  Hereinafter, a duct spacer of a flexible tube for protecting a cable according to an embodiment of the present invention will be described with reference to the drawings. In one embodiment according to the present invention, it is assumed that two types of duct spacers, a flexible tube fixing duct spacer and a flexible tube guide duct spacer, are used at both ends of the pipeline. When a plurality of cables such as a metal cable and an optical fiber cable are accommodated in a single pipe line, the present invention uses both a flexible pipe fixing duct spacer and a flexible pipe guide duct spacer. The flexible tube for cable protection that separates and protects the cable is fixed at the manhole duct port.

  As shown in FIG. 7, the duct sleeve 80 installed at the manhole duct port of the pipeline has a recess 80a in the circumferential direction on one end 80d side close to the manhole duct port, and on the other end 80c side. It has a structure that fixes the pipeline. In the present invention, without changing the structure of the existing duct sleeve 80, and further using the recess 80a of the duct sleeve 80, a duct spacer for fixing a flexible tube and a flexible tube guide as a new duct spacer. By providing the duct spacer for use, a function of preventing the flexible tube from protruding from the inside of the pipe line to the manhole side is provided.

  FIG. 1 is a schematic view in which a flexible tube fixing duct spacer and a flexible tube guide duct spacer of a flexible tube for protecting a cable according to an embodiment of the present invention are applied to a pipeline. 2 to 4 show configuration examples of flexible tube fixing duct spacers, and FIGS. 5 and 6 show configuration examples of flexible tube guide duct spacers. Referring to FIG. 1, a single line 90 between manholes is shown, and a duct spacer 50 for fixing a flexible pipe is provided at the manhole duct port of the left side of the figure. A flexible tube guide duct spacer 60 is provided at the manhole duct opening.

  In the present embodiment, one end of the laid flexible tube 110 is completely fixed by the flexible tube fixing duct spacer 50 at the manhole duct port, and the flexible tube 110 is expanded and contracted at the other end of the flexible tube 110. By inserting the flexible tube guide duct spacer 60 into the manhole duct so that it can be controlled, the flexible tube 110 is opened at one end without being fixed, and the flexible tube 110 for protecting the cable is expanded and contracted. However, it is possible to keep the end of the flexible tube 110 in the pipe line 90 so that the end of the flexible tube 110 does not jump out of the manhole duct port.

  Hereinafter, the flexible tube fixing duct spacer and the flexible tube guide duct spacer will be described in more detail.

[Flexible tube fixing duct spacer]
Referring to FIGS. 2 to 4, the flexible tube fixing duct spacer 50 includes a first disk portion 53 having a leg portion 55 that is fitted into a duct port having an insertion hole through which at least the flexible tube 110 can be inserted. And a first metal part at a predetermined interval so as to sandwich the metal fitting 52 by using the first disk part 53 and a holding metal part 52 provided on the outer periphery of the flexible pipe 110 for fixing the flexible pipe 110. And a second disk portion 51 having an insertion hole through which at least the flexible tube 110 can be inserted. In the present embodiment, insertion holes for the flexible tube 110 and the existing cable 120 are formed in the first disk portion 53 and the second disk portion 51.

  For connecting the first disk part 53 and the second disk part 51, a connecting part 54 (for example, a bolt and a nut 57) that can be adjusted so as to secure an installation space for the holding fitting 52 in the longitudinal direction of the flexible tube 110. Is preferably configured. The first disk portion 53 has a plurality of leg portions 55, and each leg portion 55 is provided with a protrusion 56. This protrusion 56 can be provided on the leg 55, but it can also be provided at the tip of the leg 55 in order to make the leg 55 elastic and fit into the duct opening. This protrusion 56 is configured to fit into the recess 80 a of the duct sleeve 80. The leg portion 55 and the projection portion 56 can be formed by integral molding when the first disk portion 53 is formed, or only the projection portion 56 is formed by another member (resin etc.). It is good also as a structure attached to 55. FIG. Moreover, the 1st disk part 53 and the 2nd disk part 55 can be produced with arbitrary resin materials. Note that the second disk portion 51 can have the same shape as the first disk portion 53 without the leg portion 55.

  Thus, according to the flexible tube fixing duct spacer 50 of the present embodiment, the flexible tube 110 is fixed by the first disk portion 53, the second disk portion 51, and the gripping metal 52, and the first disk By fixing the flexible tube fixing duct spacer 50 by fitting the projections 56 provided on the leg portions 55 of the portion 53 and the recesses 80a of the duct sleeve 80, the flexible tube is moved from the inside of the conduit to the manhole side. The protrusion 110 can be prevented.

  A flexible tube fixing method using the flexible tube fixing duct spacer 50 will be described. First, each leg portion 55 is inserted into the duct sleeve 80 while the flexible tube 110 and the existing cable 120 are inserted into the first disk portion 53 which is a component of the flexible tube fixing duct spacer 50, and the leg portion is further inserted. 55 projections 56 are fitted into the recess 80a of the duct sleeve 80 (including hooking). Next, the gripping metal fitting 52 is fixed to the outer periphery of the flexible tube 110, and the flexible tube 110 and the existing cable 120 are inserted through the second disk 51, which is a component of the flexible tube fixing duct spacer 50. The holding metal fitting 52 is sandwiched between the two disk parts (the first disk part 53 and the second disk part 51). Next, the two disk parts 51 and 53 are fixed by connecting parts 54 such as bolts and nuts.

  In this manner, the flexible tube fixing duct spacer 50 can be fixed to the existing duct sleeve 80 relatively easily, and the moving force that tends to protrude toward the manhole when the flexible tube is extended is gripped by the manhole duct port. Make it possible to do. Further, as a result of experimental verification, it has been confirmed that even if the moving force toward the manhole when the flexible tube is extended is 600 N at the maximum, according to this fixing method, the movement can be prevented.

[Flexible tube guide duct spacer]
Referring to FIGS. 5 and 6, the flexible tube guide duct spacer 60 includes a third disk portion 10 having an insertion hole through which at least the flexible tube 110 can be inserted for installation, and a third disk portion. And a guide portion 61 for guiding the flexible tube 110 connected to the 10 leg portions 15. In the present embodiment, the third disk portion 10 is formed with insertion holes for the flexible tube 110 and the existing cable 120. Further, as the third disk portion 10, the above-mentioned existing disc-shaped molded article duct spacer (see FIG. 8) or the first disk portion 53 can be used, and these leg portions 15 can be used. A connecting part 62 for connecting the guide part 61 can be provided. As described above, in the present embodiment, one or more flexible tubes 110 are configured to be movable on the guide portion 61 in the conduit.

  In the present embodiment, the guide portion 61 can be formed by metal sheet metal processing so as to have two semi-disc structures that are continuous in the longitudinal direction of the flexible tube 110 (FIGS. 6A and 6B). (See (c)). FIG. 6B is a cross-sectional view of the guide portion B-B ′ shown in FIG. FIG. 6C is a front view of the guide portion 61. Preferably, male and female coupling portions 61a, 61b, 61c, and 61d are provided at both ends of the guide portion 61 so that the end portion 110b of the flexible tube 110 does not protrude toward the manhole side (FIG. 6). (See (b)), by connecting another guide portion having a similar shape, the entire length of the guide portion 61 can be extended (see FIG. 6A). In practice, the length of the single guide portion 61 that can be extended can be about 40 to 80 cm, and the maximum length of the guide portion when extended can be about 2 m. This is because the pipe length between manholes may be several tens of meters to several hundreds of meters, and it is necessary to assume at least 2 m as the amount of change in which the flexible tube 110 expands and contracts due to environmental changes. In other words, if the flexible tube guide duct spacer 60 according to the present invention is not installed, if the flexible tube 110 expands and contracts and jumps to the manhole by about 2 m, the cable 110a inside the flexible tube 110 may be damaged. There is enough. In consideration of this, when installing the duct spacer 60 for the flexible tube guide according to the present invention, the end portion 110b of the flexible tube 110 is provided at the approximate center of the guide portion 61 in consideration of environmental conditions (temperature, humidity, etc.). It is preferable to position and install.

  A method for retaining the expansion and contraction of the flexible tube 110 using the flexible tube guide duct spacer 61 in the pipeline will be described. First, the guide part 61 which is a component part of the flexible pipe guide duct spacer 60 is inserted into the pipe line so that the existing cable 120 and the flexible pipe 110 are separated. At that time, a guide portion that is appropriately extended in consideration of the length that the tip of the flexible tube 110 stays on the guide portion 61 inside the conduit so that the flexible tube 110 is not laid to the vicinity of the wall surface on the manhole side. 61 is used. Next, the leg portion 15 of the third disk portion 10 is inserted into the duct sleeve. Further, when a protrusion (not shown) similar to that of the first disk portion 53 is provided on the leg portion 15 of the third disk portion 10, it is fitted (hanged) into the recess 80 a of the duct sleeve 80. The flexible pipe guide duct spacer 60 can be fixed to the duct sleeve 80.

  In this manner, the flexible pipe guide duct spacer 60 can be fixed to the existing duct sleeve 80 relatively easily, and can be flexibly formed on the guide portion 61 in the pipe line without affecting the existing cable 120. The end portion 110b of the tube 110 can be expanded and contracted.

  Furthermore, in the case of a facility in which the interval between adjacent manholes is long, it is assumed that the extension amount of the flexible tube 110 exceeds the length of the fixed-length guide portion 61, so that the length of the guide portion 61 is further extended. There is a need to. About this, the whole length of the guide part 61 can be made variable by newly adding the guide part 61 using the male and female coupling | bond part 61a, 61b, 61c, 61d provided in the guide part 61. FIG.

  Although specific embodiments have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.

  According to the present invention, since the cable protecting flexible tube can be prevented from protruding from the inside of the conduit to the manhole side and the quality of the cable can be improved, the cable protecting flexible tube is used. Useful for any equipment.

DESCRIPTION OF SYMBOLS 10 3rd disk part 15,25 Leg part of 3rd disk part 50 Duct spacer for flexible tube fixation 51 2nd disk part 52 Grip metal fitting 53 1st disk part 54 Connection part 55 Leg part
56 Projection part 60 Duct spacer for fixing flexible tube 61 Guide part 61a, 61b, 61c, 61d Joint part of male and female guide part 80 Duct sleeve 90 Pipe line 80a Concave part of duct sleeve 110 Flexible pipe 120 Existing cable

Claims (8)

A first disk portion having a leg portion fitted into a duct opening having an insertion hole through which at least a flexible tube can be inserted;
A holding fitting for fixing the flexible tube provided on the outer periphery of the flexible tube;
A second disk part having an insertion hole through which at least a flexible tube can be inserted and connected to the first disk part at a predetermined interval so as to sandwich the gripping metal fitting using the first disk part;
A duct spacer for fixing a flexible tube, comprising:   In order to connect the first disk part and the second disk part, it is provided with a connecting part that can be adjusted so as to secure an installation space for the gripping metal in the longitudinal direction of the flexible tube, The duct spacer for fixing a flexible tube according to claim 1.   The first disk portion has a plurality of leg portions, each leg portion is provided with a protrusion, and the protrusion is configured to be fitted with a recess of a duct sleeve provided at a duct opening. The duct spacer for fixing a flexible tube according to claim 1 or 2, characterized in that   The flexible tube is fixed by the first disk part, the second disk part, and the gripping metal fitting, and a protrusion part of the leg part of the first disk part and a concave part of a duct sleeve provided in the duct port, The flexible tube fixing duct spacer is fixed by fitting, and the flexible tube is configured to prevent the flexible tube from protruding from the inside of the conduit to the manhole side. The duct spacer for flexible tube fixation as described in any one of Claims 1-3. A third disk portion having a leg portion fitted into a duct opening having an insertion hole through which at least a flexible tube can be inserted;
A guide part for guiding the flexible tube connected to the leg part of the third disk part;
A duct spacer for a flexible tube guide, comprising:   The guide portion has one or more semi-disc structures that are continuous in the longitudinal direction of the flexible tube, and the flexible tube is movable so that the end of the flexible tube stays on the guide portion. The duct spacer for a flexible tube guide according to claim 5, wherein the duct spacer is a flexible tube guide duct spacer.   6. The male and female coupling portions are provided at both ends of the guide portion, respectively, and by connecting an extension guide portion, the entire length of the guide portion can be extended. 6. A duct spacer for a flexible tube guide according to 6. The flexible tube fixing duct spacer according to any one of claims 1 to 4, wherein the flexible tube is fixed at one manhole duct port in a single line, and the flexible tube fixing duct spacer. Securing to the duct sleeve;
The flexible tube can be freely expanded and contracted at the other manhole duct port in the conduit by the flexible tube guide duct spacer according to any one of claims 5 to 7, and the end of the flexible tube Opening the end of the flexible tube so that the portion can remain in the conduit;
A flexible tube fixing method comprising the steps of:

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