JP2007053863A - Pipeline structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipeline structure for eliminating an increase in a manufacturing cost and forming a curve in a pipeline. <P>SOLUTION: An insertion end 14 of a plurality of straight pipe members 11 disposed so as to match their axial lines is inserted into a connection end 15 of the straight pipe members 11 disposed adjacent to the insertion end so as to be pivoted on a point P at which the axial line of the straight pipe member 11 and the line of the adjacent straight pipe member 11 intersect. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a conduit structure for guiding a communication cable such as a telephone line in the ground.

  2. Description of the Related Art Conventionally, for example, a conduit structure for guiding a communication cable such as a telephone line in the ground is embedded in the ground with the axes aligned with each other and connected to each other to form a conduit for guiding the communication cable. A plurality of straight straight pipe members are provided. In this pipeline structure, when a communication cable is laid while avoiding, for example, a cylindrical manhole arranged in the middle of the pipeline, it is necessary to form a curved portion in the pipeline. When forming a curved part in a pipe line, a plurality of curved curved pipe members dedicated to form a curved part in the pipe line are arranged on the outer periphery of the manhole between a pair of straight pipe members arranged so as to sandwich the manhole. Along each other, the bent pipe members are connected to each other (see, for example, Patent Document 1).

By guiding the communication cable along the curved portion constituted by each curved pipe member, it is possible to prevent the laying of the communication cable from being hindered by the manhole.
JP-A-2005-192329 (8th page, FIG. 11)

  However, every time a curved part is formed in the communication cable pipe, it is necessary to prepare a dedicated curved pipe member for forming the curved part separately from the straight pipe member. Since the number of parts and the number of piping work steps are increased, the manufacturing cost is increased.

  Accordingly, an object of the present invention is to provide a pipeline structure that can form a curved portion in a pipeline without causing an increase in manufacturing cost.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a plurality of straight straight pipe members that are arranged with their axes aligned with each other and are connected to each other to form a pipe. The tube member has an insertion end inserted into the other end portion of the straight tube member disposed adjacent to the one end portion at one end portion thereof, and adjacent to the other end portion at the other end portion. And a connecting end for receiving the insertion end of the straight pipe member arranged in such a manner as to allow pivoting of each straight pipe member.

  According to a second aspect of the present invention, in the first aspect of the invention, the insertion end of each straight pipe member is connected to the outer peripheral surface of the straight pipe member disposed adjacent to the insertion end. It is inserted so as to be spaced over the entire circumference between the end and the inner peripheral surface of the connection end, and the outer peripheral surface of the insertion end of each straight pipe member is connected to the connection end, respectively. Overhangs are formed to project from the outer peripheral surface toward the inner peripheral surface of the connection end in the inserted state, and between each of the overhang portions and the inner peripheral surface of the connection end, An elastically deformable seal member for sealing between the straight pipe members arranged adjacent to each other is provided.

  According to a third aspect of the present invention, in the invention of the second aspect, the inner peripheral surface of the connection end of each straight pipe member should be prevented from falling off the insertion end from the connection end. A retaining portion that can be engaged with the overhanging portion is provided.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein each of the straight pipe members branches from the main line cable and the main line cable, and is drawn into the building. Each of the straight pipe members, and each of the straight pipe members to define a receiving portion for separately containing the trunk cable and the pull-in cable. A dividing member for dividing the inside of the straight pipe member is provided, respectively.

  According to the first aspect of the present invention, since the insertion ends of the straight pipe members are pivotally inserted into the connection ends of the adjacent straight pipe members, the straight pipe members are connected to each other. The angle formed by the axes of the straight pipe members adjacent to each other can be freely adjusted within the pivot range of each straight pipe member. Thereby, for example, when the present invention is applied to a pipe structure for guiding a communication cable, when laying the communication cable while avoiding a manhole arranged in the middle of the pipe, By bending the axis about the point where the axis of the straight pipe member arranged adjacent to each straight pipe member intersects, a curved portion is formed in the pipe line without using a dedicated curved pipe member as in the prior art. Can be formed. Therefore, since the curved portion of the pipe can be constituted by each straight pipe member, the number of parts and the number of piping work processes by using the curved pipe member as in the past each time the curved portion is formed in the pipe. Since the increase is suppressed, the manufacturing cost can be reduced.

  According to the second aspect of the present invention, the elastically deformable seal member is provided between the projecting portion formed at the insertion end of each straight pipe member and the inner peripheral surface of the connection end. For example, when each straight pipe member is buried in the ground, it is possible to reliably prevent, for example, groundwater or dust from entering between the adjacent straight pipe members.

  In addition, since each seal member can be elastically deformed, each straight pipe member is easily pivoted by elastically deforming the seal member by applying a pressing force from each straight pipe member to each seal member. be able to.

  Furthermore, since each seal member is elastically deformed when each straight pipe member is pivoted, each straight pipe member is brought into contact with the inner peripheral surface at the connection end of the straight pipe member arranged adjacent to each other. Pivot in contact. Thereby, even when each straight pipe member is pivoted, the adjacent straight pipe members are sealed by the respective seal members, so that, for example, water or dust is generated from between the straight pipe members regardless of the pivot angle of each straight pipe member. And the like can be reliably prevented.

  According to the third aspect of the present invention, the inner peripheral surface at the connection end of each straight pipe member is provided with a retaining portion that can be engaged with the overhanging portion to prevent the insertion end from falling out of the connection end. Therefore, even when a force is applied to each straight pipe member embedded in the ground in the direction of pulling out each straight pipe member from the adjacent straight pipe member, the retaining action of the retaining portion provided at the connection end is prevented. Thus, it is possible to prevent the insertion end inserted into the connection end from dropping out of the connection end. Accordingly, it is possible to reliably prevent water and dust from entering the straight pipe members due to the insertion end dropping out of the connection end.

  According to invention of Claim 4, the cable for trunk lines and the cable for drawing which is branched from this cable for trunk lines and is drawn in in the straight pipe member are accommodated in each straight pipe member. Since each straight pipe member is provided with a dividing member for dividing the inside of each straight pipe member so as to define an accommodating portion for separately accommodating the trunk cable and the lead-in cable in each straight pipe member. The trunk cable and the lead-in cable are accommodated in different spaces in a single pipe member. Thereby, at the time of drawing-in of the drawing-in cable, it is possible to prevent the drawing-in cable from being damaged as in the case where the trunk cable and the drawing-in cable are mixed in a single pipe member.

  In addition, since the above-described curved portion of the pipe line can be constituted by each straight pipe member, when drawing the drawing cable into the building, the drawing pipe for guiding the drawing cable from the pipe line to the building is arranged in the pipe line. Even if it is attached to the bent portion, a gap is less likely to be formed between the lead-in tube and the bent tube member as compared with the case where the bent portion of the pipe is formed of a bent tube member. Thereby, watertightness is securable between a drawing-in pipe and a curved pipe member.

  The present invention will be described with reference to the illustrated embodiments.

  FIG. 1 shows an example in which the present invention is applied to a conduit structure 10 for guiding a trunk cable 13 of a communication cable 12 such as a telephone line in the ground. As is well known in the art, the trunk cable 13 is composed of, for example, a bundle of cables connecting telephone offices.

  As shown in FIG. 1, the pipe structure 10 according to the present invention includes a plurality of straight pipe members 11 having a linear shape. In the illustrated example, each straight pipe member 11 is formed of a cylindrical member made of a synthetic resin material having high strength such as hard vinyl chloride, and has a uniform diameter in the longitudinal direction. The straight pipe members 11 are arranged in the ground with their axes aligned with each other, and are connected to each other to form a pipe line R that guides the trunk cable 13 in the ground.

  The straight pipe member 11 according to the present invention has an insertion end 14 to be inserted into the other end of the straight pipe member 11 disposed adjacent to the one end at one end, and the other at the other end. It has a connection end 15 for receiving the insertion end 14 of the straight pipe member 11 arranged adjacent to the end.

  In the illustrated example, first recesses 16 are formed on the inner peripheral surface 11 a of the connection end 15 of each straight pipe member 11 so as to go around the inner peripheral surface and open to the end surface of the connection end 15. In the illustrated example, each first recess 16 has a predetermined width dimension in the longitudinal direction of each straight pipe member 11. On the outer peripheral surface 11 b at the insertion end 14 of each straight pipe member 11, in the example shown in the figure, second recesses 17 are formed that go around the outer peripheral surface and open to the end surface of the insertion end 14. Each of the second recesses 17 has a width dimension substantially equal to that of each of the first recesses 16 in the longitudinal direction of each straight pipe member 11. The diameter defined by the bottom surface 17 a of each second recess 17, that is, the outer diameter of each insertion end 14 is smaller than the diameter defined by the bottom surface 16 a of the first recess 16, ie, the inner diameter of each connection end 15. Is set. Thereby, each insertion end 14 can be inserted into each connection end 15. When each insertion end 14 is inserted into each connection end 15, the bottom surface 16 a of the first recess 16 of each connection end 15 and each insertion end 15 are inserted. A space is provided over the entire circumference between the end 14 and the bottom surface 17 a of the second recess 17.

  As shown in FIG. 2, overhanging portions 18 are formed on the open ends 17 b of the bottom surfaces 17 a of the second recesses 17 so as to protrude outward in the radial direction of the straight pipe members. In the example shown in the drawing, each overhang portion 18 is formed so as to go around the open end 17 b in the circumferential direction of each straight pipe member 11. The protruding amount of each protruding portion 18 from the open end 17 b of the bottom surface 17 a of each second recess 17 is based on the distance between the bottom surface 16 a of each first recess 16 and the bottom surface 17 a of each second recess 17. Is set to be smaller. In the illustrated example, an annular seal member 19 for sealing between the adjacent straight pipe members 11 is provided at the tip 18a of each overhanging portion 18. Each seal member 19 is formed of an elastically deformable material such as rubber, for example, and is disposed along the tip 18 a of each overhanging portion 18. When the respective insertion ends 14 are inserted into the respective connection ends 15, the respective seal members 19 come into contact with the bottom surfaces 16 a of the respective first recesses 16, whereby the adjacent straight pipe members 11 are sealed. Moreover, since each 1st recessed part 16 and each 2nd recessed part 17 have a predetermined | prescribed width dimension in the longitudinal direction of each straight tube | pipe member 11, as mentioned above, each seal member 19 is attached to each 1st By sliding the bottom surface 16a of the concave portion 16 along the longitudinal direction of each straight pipe member 11, the insertion amount of each insertion end 14 to each connection end 15 can be adjusted, and therefore the pipe line 13 has its longitudinal direction. It becomes possible to expand and contract along. Thereby, the length dimension of the whole pipe line 13 can be adjusted. Further, by applying a pressing force from each straight pipe member 11 to each seal member 19 toward the bottom surface 16a of each first recess 16, each straight pipe member 11 is sealed as shown in FIG. Centering around a point P where the axis of each straight pipe member 11 intersects with the axis of the straight pipe member 11 arranged adjacent to each straight pipe member in a state where the sealing function is maintained by elastic deformation of the member 19. Can pivot.

  As shown in FIG. 2, the bottom surface 16 a of each first recess 16 is provided with a retaining portion 20 for preventing the insertion end 14 from falling off from each connection end 15. In the illustrated example, each retaining portion 20 is provided at the open end 16 b of the bottom surface 16 a of each first recess 16 so as to protrude radially inward of each straight pipe member 11 from the open end. The protruding amount of each retaining portion 20 from the open end 16 b of the bottom surface 16 a of each first recess 16 is the direction in which each insertion end 14 is pulled out from each connection end 15 in the insertion state of each insertion end 14 to each connection end 15. When each straight pipe member 11 moves, the size is set such that it can be engaged with each overhanging portion 18, and in the illustrated example, the bottom surface 16a of each first recess 16 and each second recess 17 is set so as to be smaller than the distance between the bottom surface 17a. In the illustrated example, an annular seal member 21 similar to that described above is provided at the tip 20a of each retaining portion 20. Each seal member 21 is in a state in which each insertion end 14 is inserted into each connection end 15, and each seal member 21 comes into contact with the bottom surface 17 a of each second recess 17, so that the respective straight pipe members 11 adjacent to each other. The gap is sealed together with each seal member 19.

  As described above, the insertion end 14 of each straight pipe member 11 is disposed at the connection end 15 of the adjacent straight pipe member 11 so as to be adjacent to the axis of each straight pipe member 11 and each straight pipe member. 11 is inserted so as to be pivotable about a point P at which the axis of each of the straight pipes 11 intersects with each other, the angle formed by the axes of the straight pipe members 11 adjacent to each other in a state where the straight pipe members 11 are connected to each other. It can be adjusted freely within 11 pivot ranges.

  Accordingly, for example, when the trunk cable 13 is laid while avoiding a manhole (not shown) arranged in the middle of the pipe R, each straight pipe member 11 is pivoted, so that a conventional curved pipe is used. A curved part can be formed in the pipe line R without using a member.

  Therefore, since the curved part of the pipe line R can be constituted by each straight pipe member 11, the number of parts and the piping work by using the conventional curved pipe member every time the curved part is formed in the pipe line R. Since the increase in the number of steps is suppressed, the manufacturing cost can be reduced.

  In addition, as described above, since the elastically deformable seal member 19 is provided at the distal end 18a of the overhanging portion 18 formed at the insertion end 14 of each straight pipe member 11, they are adjacent to each other in the ground. For example, it is possible to reliably prevent the entry of, for example, groundwater or dust from between the straight pipe members 11 embedded.

  Furthermore, as described above, since each seal member 19 provided in each overhanging portion 18 can be elastically deformed, each seal member can be applied by applying a pressing force from each straight pipe member 11 to each seal member 19. By elastically deforming 19, each straight pipe member 11 can be easily pivoted.

  Further, as described above, each straight pipe member 11 pivots in a state where each seal member 19 is in contact with the inner peripheral surface 11a at the connection end 15 of the straight pipe member 11 arranged adjacent to each other. Therefore, the adjacent straight pipe members 11 are sealed by the seal members 19 even when the straight pipe members 11 are pivoted. Thereby, it is possible to reliably prevent, for example, groundwater or dust from entering between the straight pipe members 11 regardless of the pivot angle of the straight pipe members 11.

  Further, as described above, the retaining portion that can be engaged with each overhanging portion 18 to prevent the insertion end 14 from falling off from the inside of the connecting end 15 on the inner peripheral surface 11 a of the connecting end 15 of each straight pipe member 11. 20 is provided at the connection end 15 even when a force is applied to each straight pipe member 11 embedded in the ground in the direction of pulling out each straight pipe member from the adjacent straight pipe member 11. Further, it is possible to prevent the insertion end 14 inserted into the connection end 15 from falling out of the connection end 15 by the retaining action of the retaining portion 20. Thus, it is possible to reliably prevent water and dust from entering the straight pipe members 11 due to the insertion end 14 dropping out of the connection end 15.

  Further, as described above, the seal member 21 that seals between the straight pipe members 11 adjacent to each other together with the seal members 19 provided on the overhang portions 18 at the distal ends 20a of the retaining portions 20 is provided. Since it is provided, it is possible to prevent the groundwater, dust, and the like from entering between the straight pipe members 11 adjacent to each other more reliably.

  In the present embodiment, an example in which the trunk cable 13 of the communication cable 12 is accommodated in the pipe line R constituted by the straight pipe members 11 connected to each other is shown, but in addition to the trunk cable 13, the trunk line A plurality of lead-in cables 22 branched from the cable for use and drawn into a building such as a house or a store (not shown) can be accommodated in the pipe R.

  In this case, as shown in FIG. 3 (a), in order to accommodate each drawing cable 22 in the pipe R separately from each main cable 13, the inside of each straight pipe member 11 is shown in its cross section. A dividing member 23 can be provided in the pipe R to divide it into two in the vertical direction.

  In the illustrated example, the dividing member 23 is disposed so as to extend along the longitudinal direction of the pipe line R. As a result, the inside of each straight pipe member 11 is divided into two parts in the vertical direction as seen in the cross section, and each straight pipe member 11 is accommodated for accommodating the trunk cable 13 and the lead-in cable 22 respectively. Each part is defined. As a result, the trunk cable 13 and the lead-in cable 22 are accommodated in different spaces within a single pipe member.

  In the example shown in FIG. 3B, the dividing member 23 is cut for each length dimension substantially equal to the length dimension in the longitudinal direction of each straight pipe member 11, and a plurality of cut portions of the dividing member 23 are cut. The gaps are connected to each other by a connecting member 24 made of an elastically deformable material such as rubber. Thereby, the division member 23 can be made to follow the pivot of each straight pipe member 11. Instead of cutting the dividing member 23 into a plurality of parts in order to make the dividing member 23 follow the pivot of each straight pipe member 11, the dividing member 23 is positioned at a position corresponding to the connecting portion of each straight pipe member 11. A slit (not shown) extending along the width direction can be formed.

  When each drawing cable 22 is drawn into the building from the pipeline R, an opening (not shown) for taking out each drawing cable 22 from the pipeline R is formed in the pipeline R as is well known in the art. A lead-in pipe (not shown) for guiding the cable 22 from the pipe 13 to the building is attached to the pipe R so as to open into the pipe R through the opening.

  Conventionally, when the bent portion of the pipe R is configured by a curved pipe member (not shown), a gap is formed between the drawn pipe and the bent pipe member when the drawn pipe is attached to the bent portion. Therefore, it is difficult to ensure watertightness between the drawing pipe and the bent pipe member.

  On the other hand, according to the example shown in FIG. 3, as described above, the curved portion as shown in FIG. 3B of the pipe line R can be constituted by each straight pipe member 11. Even if the lead-in pipe is attached to the curved portion of the pipe R when the cable 22 is pulled into the building, the lead-in pipe and the curved pipe are compared with the case where the lead-in pipe is attached to the curved pipe member as in the prior art. It is difficult to form a gap between the members. Thereby, watertightness can be ensured between the drawing-in pipe and the bent pipe member.

  Further, according to the example shown in FIG. 3, as described above, the trunk cable 13 and the lead-in cable 22 are accommodated in different spaces in a single pipe member. Sometimes, it is possible to prevent the pull-in cable 22 from being damaged as when the main cable 13 and the pull-in cable 22 are mixed in a single pipe member.

  Further, in the present embodiment, the overhanging portion 18 formed on the bottom surface 17a of the second recess 17 of each insertion end 14 and the retaining portion 20 formed on the bottom surface 16a of the first recess 16 of each connection end 15 are provided. Although the example in which the seal members 19 and 21 are provided is shown, instead of this, the tip 18a of the overhanging portion 18 and the tip of the retaining portion 20 are respectively inserted into the first recess 16 and the second recess 17 respectively. A seal member capable of coming into contact with 20a can be provided.

  Furthermore, in this embodiment, an example is shown in which the recesses 16 and 17 are formed in each insertion end 14 and each connection end 15 so that each insertion end 14 can be inserted into each connection end 15. Thus, for example, the straight ends 11 can be formed so that the outer diameters of the straight pipe members 11 gradually decrease with the insertion ends 14 facing the end faces.

  In the present embodiment, an example in which the present invention is applied to the pipe structure 10 that guides the communication cable 12 that is simply buried in the ground has been shown. The present invention can be applied to a pipe line structure using a common wire groove. In this case, the present invention can be applied to a conduit that guides a communication cable that extends from the electric wire joint groove embedded in the ground.

  Furthermore, in the present embodiment, the example in which the present invention is applied to the conduit structure 10 for guiding the communication cable 12 in the ground is shown, but instead of this, for example, other than the communication cable 12 such as a power cable The present invention can be applied to a pipe structure for guiding a cable.

It is a longitudinal section showing a pipe line structure concerning the present invention roughly. It is a longitudinal section showing roughly the connection state of the straight pipe members concerning the present invention. (A) is a cross-sectional view schematically showing an example in which a dividing member is provided in each straight pipe member, and (b) is a schematic example in which a dividing member is provided in each straight pipe member. It is a longitudinal cross-sectional view shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe structure 11 Straight pipe member 11a Inner peripheral surface 11b Outer peripheral surface 12 Cable (communication cable)
14 Insertion end 15 Connection end 18 Overhang portion 19, 21 Seal member 20 Detachment portion 23 Split member

Claims (4)

  A plurality of straight straight pipe members that are arranged with their axes aligned with each other and connected to each other to form a pipe line are provided, and each straight pipe member is arranged at one end portion thereof and adjacent to the one end portion. An insertion end to be inserted into the other end of the straight pipe member, and the insertion end of the straight pipe member disposed adjacent to the other end is connected to each of the straight ends. A conduit structure having a connecting end for accepting pivoting of a pipe member.   The insertion end of each straight pipe member extends over the entire circumference between the outer peripheral surface thereof and the connection end of the straight pipe member disposed adjacent to the insertion end to the inner peripheral surface of the connection end. It is inserted so as to be spaced, and the outer peripheral surface of the insertion end of each straight pipe member is respectively inserted from the outer peripheral surface toward the inner peripheral surface of the connection end in the inserted state to the connection end. Overhanging portions are formed, and between each of the overhanging portions and the inner peripheral surface of the connection end, elasticity for sealing between the straight pipe members disposed adjacent to each other The duct structure according to claim 1, further comprising a deformable seal member.   The inner peripheral surface at the connection end of each straight pipe member is provided with a retaining portion that can be engaged with the projecting portion to prevent the insertion end from falling off from the connection end. The pipe line structure according to claim 2 characterized by things.   Each straight pipe member accommodates a main line cable and a lead-in cable branched from the main line cable and drawn into a building, and in each straight pipe member, the straight pipe member 2. A dividing member for dividing the inside of each straight pipe member is provided to define an accommodating portion for separately accommodating the trunk cable and the lead-in cable, respectively. The pipe line structure according to any one of claims 1 to 3.

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