JP2005354819A - Joint for cable protective conduit, and construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint for a cable protective conduit which allows the end positions of inner tubes within mounting pipes to be put in set positions without fail and a specified quantity of expansion and contraction to be secured, and a construction method for a cable protective conduit using this joint. <P>SOLUTION: A step of temporarily fixing a fixing plate 24 having held a plurality of mounting pipes 21 in a preset position in the direction of its end point by a fixing member 28, a step of connecting inner tubes 14 to the mounting pipes 21 and abutting the insertion ends against inner pipe regulating parts 22, a step of connecting a preset number of inner tubes in order to the other ends of the inner tubes connected to the mounting pipes, and a step of releasing the temporary fixation of the fixing plate by the fixing member and shifting the fixing plate in the direction of its starting point while guiding it with a guide member 29 are performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a joint for a cable protection pipe and a construction method, and more particularly, to a cable protection pipe for connecting a plurality of inner pipes through which communication cables, power cables and the like are inserted so as to be extendable and slidable in outer pipes. The present invention relates to a joint and a construction method.

As a conduit for protecting cables such as communication cables and power cables, there are known cable protection conduits in which a plurality of inner tubes are inserted into the outer tubes and the cables are inserted into the inner tubes. In such cable protection pipelines, mounting joints for holding the inner pipe slidably in the axial direction are used in parts such as hand holes to absorb the expansion and contraction of the pipeline due to earthquake shaking and temperature changes. (For example, refer to Patent Document 1).
JP 2001-352651 A

  However, the conventional mounting joint only inserts the end of the inner pipe into the mounting pipe into which the inner pipe can be inserted. During the construction in which the connection is sequentially made, the inner pipe in the attachment pipe may move unintentionally, and there is a possibility that a predetermined expansion / contraction amount cannot be obtained. Further, the position of the end portion of the inner pipe in the mounting pipe can only be grasped by inserting a measure into the mounting pipe from a hand hole or the like.

  Therefore, the present invention uses a joint for a cable protection pipe and a joint for a cable protection pipe that can reliably arrange an end portion position of an inner pipe in a mounting pipe at a set position and can secure a predetermined expansion / contraction amount. The purpose is to provide a method for constructing cable protection pipelines.

  In order to achieve the above object, the cable protection pipe joint according to the present invention is the cable protection pipe joint for connecting a plurality of inner pipes through which cables are inserted so as to be extendable and slidable in the outer pipe. A plurality of mounting tubes respectively connected in an axially slidable state to one end of the inner tube, and an inner tube position restricting portion provided on the mounting tube to restrict the end position of the inner tube; A fixing plate for holding the plurality of mounting pipes, and a guide member having a fixing member for moving the fixing plate in the joint axial direction and fixing the fixing plate at a preset position. It is said.

  The cable protection pipe construction method using the joint includes a step of temporarily fixing and fixing a fixing plate holding the plurality of mounting pipes at a predetermined position in the end point direction by the fixing member; Connecting the inner pipe to contact one end of the inner pipe with the inner pipe position regulating section, and a predetermined number of inner pipes in the other end direction of the inner pipe connected to the mounting pipe. A method of constructing a cable protection pipe, comprising: sequentially connecting and releasing the temporary fixing of the fixing plate by the fixing member and moving the fixing plate in the direction of the starting point while guiding the fixing plate to the guide member .

  According to the present invention, since the end portion of the inner tube inserted into the attachment tube is restricted by the inner tube position restricting portion, it is possible to prevent the inner tube from moving in the starting direction in the attachment tube during construction. Then, by moving the position of the attachment pipe to a preset position via the fixing plate after the construction, the end position of the inner pipe in the attachment pipe can be reliably arranged at the preset position.

  1 to 6 show an embodiment of the present invention. FIG. 1 is an explanatory view showing the state of each member centering on the joint. FIG. 2 is a front view of a fixing plate holding a mounting pipe. 3 is a front view of the fixing member, FIG. 4 is a cross-sectional view showing a state at the start of construction, FIG. 5 is a cross-sectional view showing a state when the inner pipe connection is completed, and FIG. 6 is a cross-sectional view showing a state when the construction is completed. .

  First, the joint 11 for a cable protection conduit shown in this embodiment is provided between a connection pipe 13 attached to a structure 12 such as a handhole and an outer pipe 15 that houses a plurality of inner pipes 14. A plurality of mounting pipes 21 inserted and connected to each other in a state in which one end portions of the plurality of inner pipes 14 are slidable in the axial direction; An inner tube position restricting portion 22 for restricting the portion position, a fixing plate 24 having a tube holding portion 23 for holding the plurality of attachment tubes 21, and the fixing plate 24 inserted in a state of being movable in the axial direction. A joint member 27 having a receiving port 26 for joining one end of the straight pipe portion 25 and the outer pipe 25 and the fixing plate 24 are moved in the axial direction within the straight pipe portion 25 of the joint member 27, and Guy provided with a fixing member 28 for fixing the position in the pipe portion 25 And a member 29.

  The attachment tube 21 has an inner diameter corresponding to the outer diameter of the inner tube 14, for example, an inner diameter 0.5 to 2 mm larger than the outer diameter of the inner tube 14, and has a sufficient amount of expansion and contraction expected for the inner tube. It has a length that can be absorbed. The inner tube position restricting portion 22 is connected to the end portion of the attachment tube 21 with a small diameter portion 21a having an inner diameter smaller than the outer diameter of the inner tube 14, so that the inner tube position restricting portion 22 and the inner tube position restricting portion 22 are connected to the inner peripheral surface of the attachment tube. The inner tube 14 inserted into the attachment tube 21 is restricted from moving in the insertion direction when the end of the inner tube 14 abuts against the inner tube position restricting portion 22.

  The tube holding portion 23 provided on the fixing plate 24 is provided with through holes corresponding to the outer diameter of the small diameter portion 21 a according to the number of the mounting tubes 21, and the small diameter portion inserted through the tube holding portion 23. A short tube 21b having an inner diameter corresponding to the outer diameter of the small diameter portion 21a is joined to 21a by bonding or the like, and a fixed plate is formed between the step formed on the outer peripheral surface of the mounting tube 21 and the tip of the short tube 21b. The attachment tube 21 is fixed to the tube holding portion 23 so that 24 is sandwiched therebetween. In addition, an operation rod 30 that is used when the fixing plate 24 is slid in the axial direction within the straight pipe portion 25 is detachably attached to the central portion of the fixing plate 24.

  The straight pipe portion 25 in the joint member 27 serves as an insertion port inserted into the receiving port 13a of the connecting pipe 13, and the rubber ring attached to the receiving port 13a is joined to the connecting pipe 13 13b. A rubber ring 26 a for joining the outer tube 15 is attached to the inner periphery of the receiving port 26 in the joint member 27.

  The guide member 29 is composed of three rod-like members attached with the distal end portion 29a being attachable to and detachable from the fixed plate 24. The length of the guide member 29 corresponds to the amount of movement of the fixed plate 24 in the axial direction. doing. Further, the fixing member 28 is formed in a ring shape corresponding to the end portion of the straight pipe portion 25, and is fixed to the end portion of the straight pipe portion 25 by adhesion or the like. On the inner peripheral side of the fixing member 28, a protruding piece 28b having a through hole 28a for slidably inserting the proximal end side 29b of the guide member 29 is provided, and fixing for temporarily fixing the guide member 29 is fixed. A tool 28c is provided.

  The fixing tool 28c can be of any structure as long as the rod-shaped guide member 29 can be prevented from sliding in the axial direction within the through hole 28a, and fixing means such as a clip or a wedge can be used. . Further, the structure in which the tips of the guide member 29 and the operating rod 30 are detachably attached to the fixing plate 24 is also arbitrary. For example, a female screw is formed in a through hole portion provided at a predetermined position of the fixing plate 24, or a nut is previously attached The male screw formed at the tip of the guide member 29 and the operating rod 30 may be screwed into the female screw or nut.

  Next, the construction procedure of the cable protection pipeline using this joint 11 will be described. First, as shown in FIG. 1, the fixing plate 24 holding the attachment tube 21 is inserted into the distal end side (end point direction on the receiving port 26 side) of the straight tube portion 25 of the joint member 27, and the guide member 29 is fixed to the fixture 28c. The position of the mounting tube 21 in the joint 11 is fixed by temporarily fixing the fixing member 28 to the fixing member 28.

  Next, as shown in FIG. 4, the straight pipe portion 25 of the joint member 27 to which the attachment pipe 21 is attached is inserted and joined into the receiving port 13 a of the connection pipe 13 attached to the structure 12 on the starting point side. Thereafter, one end of each inner tube 14 is inserted into each attachment tube 21, and the insertion end 14 a of the inner tube 14 is brought into contact with the tube holding portion 23. Further, the end portion of the outer tube 15 is inserted into the receiving port 26 of the joint member 27 and joined.

  Subsequently, in the same manner as in the prior art, a predetermined number of inner tubes and outer tubes are sequentially joined to the other end of each inner tube and outer tube toward the end point side. At this time, the force when joining the inner pipe on the end point side to the joined inner pipe on the start side, for example, the force when inserting the end of the inner pipe on the end point side into the receptacle of the inner pipe on the start side Even if it acts on the inner tube 14 at the starting point, the insertion end of the inner tube 14 is in contact with the tube holding portion 23, so that the inner tube 14 moves in the direction of the starting point and is inserted to the depth of the mounting tube 21. The tip position of the inner tube 14 in the attachment tube 21 is held at a preset position.

  When the connection of the inner tube and the outer tube to the end point side is completed, as shown in FIG. 5, the fixing member 28 c is removed to allow the guide member 29 to slide, and the handle 31 is attached to the operation rod 30. Then, the fixing plate 24 is drawn to the position opposite to the receiving port (starting direction) of the straight pipe portion 25, and the fixing plate 24 is brought into contact with the fixing member 28 as shown in FIG. Finally, the guide member 29 and the operation rod 30 are removed from the fixing plate 24, and the fixing plate 24 and the fixing member 28 are fixed using bolts, nuts, etc., thereby completing the construction of the cable protection conduit.

  Note that by reducing the sliding resistance between the outer surface of the inner tube 14 and the inner surface of the connecting tube 21, for example, the inner diameter of the mounting tube 21 with respect to the outer diameter of the inner tube 14 can be taken into account, or the contact surface between the two in advance. By interposing a lubricant or the like on the inner tube 14, it is possible to prevent the inner tube 14 from moving together with the connecting tube 21 when the connecting tube 21 is pulled through the fixing plate 24. The movement of the inner tube 14 can also be prevented by holding the end point side of the inner tube with an appropriate means.

  By connecting the inner tube 14 and the connecting tube 21 in this way, the end position of the inner tube 14 with respect to the connecting tube 21 can be reliably arranged at a preset position. A sufficient amount of expansion and contraction can be secured.

  7 and 8 are sectional views showing other embodiments of the joint of the present invention. In the following description, the same components as those shown in the above-described embodiment are given the same reference numerals, and detailed description thereof is omitted.

  In the embodiment shown in FIG. 7, the fixing member 28 is fixed in the connection pipe 13 attached to the structure 12. The inner tube position restricting portion 22 is formed by bonding and fixing the block 32 to the inner peripheral surface of the attachment tube 21. In the embodiment shown in FIG. 8, the fixing member 28 is fixed to the inner wall of the structure 12. Furthermore, the end of the outer tube 15 can be used as the straight tube portion 25.

  Note that the sliding amount of the fixing plate 24 can be set according to the construction conditions of the cable protection conduit, and it is not necessary to bring the fixing plate 24 into contact with the fixing member 28, and the fixing plate 24 can be fixed at an appropriate position in the middle portion. 24 may be fixed. The internal / external relationship between the inner tube 14 and the attachment tube 21 is also arbitrary, and the attachment tube 21 may be inserted into the inner tube 14.

It is explanatory drawing which shows the state of each member centering on the coupling of this invention. It is a front view of the fixed board holding the attachment pipe. It is a front view of a fixing member. It is sectional drawing which shows the state at the time of construction start. It is sectional drawing which shows the state at the time of an inner pipe connection completion. It is sectional drawing which shows the state at the time of completion of construction. It is sectional drawing which shows the other example of a form in the coupling of this invention. It is sectional drawing which shows the further another example of a form in the coupling of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Joint, 12 ... Structure, 13 ... Connection pipe, 13a ... Receptacle, 13b ... Rubber ring, 14 ... Inner pipe, 14a ... Insertion end, 15 ... Outer pipe, 21 ... Mounting pipe, 21a ... Small diameter part, 21b DESCRIPTION OF SYMBOLS ... Short pipe, 22 ... Inner pipe position control part, 23 ... Pipe holding part, 24 ... Fixing plate, 25 ... Straight pipe part, 26 ... Receptacle, 26a ... Rubber ring, 27 ... Joint member, 28 ... Fixing member, 28a ... Through hole, 28b ... Projection piece, 28c ... Fixing tool, 29 ... Guide member, 29a ... Tip, 29b ... Base end, 30 ... Operating rod, 31 ... Handle, 32 ... Block

Claims (2)

  In a joint for cable protection conduit for connecting a plurality of inner pipes through which cables are inserted in an outer pipe so as to be extendable and slidable, each joint is connected to one end of the plurality of inner pipes in an axially slidable state. A plurality of mounting pipes, an inner pipe position regulating portion that is provided on the mounting pipe and regulates the position of the end of the inner pipe, a fixing plate that holds the plurality of mounting pipes, and the fixing plate that is connected to the joint axis And a guide member having a fixing member for moving in a direction and fixing at a preset position.   A cable protection pipe construction method for connecting the inner pipe in a stretchable state using the cable protection pipe joint according to claim 1, wherein the fixing plate holding the plurality of attachment pipes is fixed. A step of temporarily fixing and fixing to a predetermined position in the end point direction by a member; a step of connecting the inner tube to the mounting tube and abutting one end portion of the inner tube against the inner tube position regulating portion; and the mounting A step of sequentially connecting a predetermined number of inner pipes in the direction of the other end of the inner pipe connected to the pipe, and releasing the temporary fixing of the fixing plate by the fixing member and guiding the fixing plate to the guide member A method for constructing a cable protection conduit, comprising a step of moving in a starting direction.

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