JP2007209107A - Cable protecting pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable protecting pipe for preventing a manufacturing cost from increasing, prevented from being bent by a reaction force due to a bending of a cable or a sheath accommodated within a protecting pipe body, and easily dealing with a change in a piping orientation. <P>SOLUTION: A separator for dividing an interior of the protecting pipe body is disposed within the protecting pipe body. The protecting pipe body 11 of the cable protecting pipe 10 is provided with a pipe member 13 for linearly extending, and a bent pipe 15 having a curved section 14. The separator 31 is fixed within the pipe member 13, can not be rotated around an axial line of the pipe member relative to the pipe member 13, and can be rotated around an axial line of the bent pipe relative to the bent pipe 15. The bent pipe 15 is coupled to the pipe member 13 in a predetermined rotational position around the axial line of the pipe member 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cable protection tube for protecting a communication cable such as a telephone line.

  Conventionally, a communication cable such as a telephone line is composed of, for example, a plurality of trunk cables connecting between telephone offices and a plurality of lead-in cables branched from the trunk cable and drawn into a building such as a house or a store. In order to maintain the scenery of the road, it is known to embed each main line cable and each pull-in cable under the road surface of the road (see, for example, Patent Document 1).

  In this pipeline structure, the trunk cable and the lead-in cable are accommodated in different cable protection pipes. This reduces the proportion of each cable that occupies the space under the road surface when each cable is embedded under the road surface of the road, as compared with the case where each cable is accommodated in a different cable protection tube, for example. Therefore, both cables can be easily embedded under the road surface of a relatively narrow road such as a road provided in a residential area or a shopping street.

  However, in the future, if the underground cable has further progressed, and it becomes necessary to embed the main cable and the lead-in cable under the narrow road surface of the narrow road, the above-mentioned pipe structure is used as the road surface of the narrow road. It becomes difficult to install underneath, and this pipe structure cannot sufficiently handle narrow roads.

  Therefore, the inventor of the present application has proposed a pipeline structure that can solve the above problem in Japanese Patent Application No. 2005-273174. This conduit structure includes a cable protection tube including a protection tube main body that accommodates a main line cable, and a separator that is disposed in the protection tube main body and divides the inside of the protection tube main body into two. The separator is divided into upper and lower parts when the cable protection tube is embedded and the inside of the protection tube body is viewed in cross section, and is fixed in the protection tube body so as not to rotate around the axis of the protection tube body. Yes. The trunk cable is accommodated in a lower space in the protective tube main body, and the lead-in cable is accommodated in an accommodating portion defined by the upper space in the protective tube main body.

  According to this, since the trunk cable and the lead-in cable are accommodated in a single cable protection tube, compared with the conventional case where the trunk cable and the lead-in cable are accommodated in different cable protection tubes, respectively. When each cable is buried under the road surface of the road, the ratio of each cable to the space under the road surface can be further reduced.

  Accordingly, since the pipe structure can be made more compact than before, for example, under the road surface of a narrow road having a smaller width than a road provided in a residential area or a shopping street, each main cable and Each lead-in cable can be embedded easily.

In addition, since the separator divides the protective tube main body into the building when the cable protective tube is buried, the separator is divided into upper and lower parts when viewed in cross section. When forming an opening in the protection tube body for taking out the lead-in cable from the inside of the protection tube body, it is possible to easily determine the position corresponding to the housing portion of the protection tube body without searching through trial and error. The opening can be formed at an appropriate position in the protective tube body.
JP 2004-120956 (Page 4-6, FIG. 6)

  By the way, when it is necessary to change the piping direction of the cable protection tube in accordance with the laying direction of the communication cable, a cable protection tube including a protection tube body having a straight pipe portion and a curved curved pipe portion that are linearly used is used. . In this case, the separator described above is fixed in the protective tube main body so as to divide the protective tube main body in the vertical direction regardless of the bending direction of the curved pipe portion in a state where the cable protective tube is embedded below the road surface. . In other words, in cable protection pipes used to bend the piping direction to the right, for example, the separator is fixed in the protection pipe body so that the separator divides the protection pipe body in the vertical direction with the curved pipe portion bent to the right. Has been.

  For this reason, if the cable protection tube used to bend the piping direction to the right direction, for example, is used to bend the piping direction to a direction other than the right direction, the rotation posture of the separator around the axis of the protection tube body is When the cable protection tube is embedded, the position of the housing part in which the retractable cable is housed cannot be determined when the cable protection tube is buried, and the cable protection tube Is not versatile. For this reason, it is necessary to manufacture a dedicated cable protection tube having a curved pipe portion directed in a direction corresponding to the piping direction for each piping direction, resulting in an increase in manufacturing cost.

  Instead of the protective tube main body having such a curved pipe portion, it is conceivable to use a protective tube main body in which another pipe member is pivotally connected to the pipe member like a so-called universal joint. When the protective tube body is bent by pivoting the other tube member, the communication cable is protected by the bending reaction force of the communication cable bent in the protective tube body by the pivot of the another tube member, or For example, when inserted into a sheath tube within the tube body, the protective tube body is bent back by the respective bending reaction forces of the sheath tube and the communication cable.

  Accordingly, an object of the present invention is to provide a cable protection tube in which a separator that divides the inside of the protection tube main body is disposed in the protection tube main body, without causing an increase in manufacturing cost and bending of the cable accommodated in the protection tube main body. It is an object of the present invention to provide a cable protection tube that can easily cope with a change in piping direction without being bent back by a reaction force.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a cable protection tube for protecting a cable, and includes a tube member and a protection tube body having a bent tube connected to the tube member, A separator disposed in the protective tube main body and configured to divide the protective tube main body into at least two pipe lines for individually accommodating the cables in the protective tube main body, the separator comprising the tube Fixed relative to the member about an axis of the tube member and non-rotatable relative to the bent tube and rotatable about the axis of the bent tube, the bent tube about the axis of the tube member The tube member is coupled to the tube member at a predetermined rotational position.

  According to a second aspect of the present invention, in the first aspect of the present invention, at the opposite ends of the pipe member and the curved pipe, annular pipes projecting outward from the pipe member and the curved pipe, respectively. A protruding portion is formed, and the pipe member and the curved pipe are connected to each other via a fastener at the two protruding portions.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the end of one end of the pipe member and the curved pipe is opposite to the end of the other end. A plurality of projecting portions projecting toward the end surface are formed at predetermined intervals in the circumferential direction of the end surface, and the end surface of the other end portion has each projecting portion at a position corresponding to each projecting portion. A plurality of recesses that can be engaged with the part are formed, and the curved pipe is characterized in that the rotational position around the axis of the pipe member can be adjusted at predetermined intervals.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the pipe member is a tubular body for connecting the pipe main body and the pipe main body and the curved pipe to each other. And a connecting member.

  According to the first aspect of the present invention, the protective tube body has a tube member and a curved tube connected to the tube member, and the separator rotates relative to the tube member around the axis of the tube member. Protected from being fixedly fixed and rotatable relative to the bent tube about the axis of the bent tube, the bent tube being coupled to the tube member at a predetermined rotational position about the axis of the tube member For example, in a state where the separator is fixed in the protective tube main body so that the inside of the tube main body is divided into upper and lower parts when viewed in its cross section, the tube member is formed so that the bending direction thereof faces a desired direction. And can be coupled to the tube member by rotating around its axis.

  As a result, when it is necessary to change the piping direction of the cable protection tube according to the laying direction of the cable accommodated in the protection tube body, the bending tube is bent at the rotational position where the bending direction of the bending tube is directed to the piping direction of the cable protection tube. By connecting the pipe to the pipe member, the rotation orientation of the separator around the axis of the pipe member can be easily changed to the direction of the piping of the cable protection pipe without deviating from the proper rotation posture that divides the inside of the protection pipe body vertically. Can be matched.

  Accordingly, since the cable protection pipe can be provided with versatility, there is no need to manufacture a dedicated cable protection pipe as in the related art having a curved pipe portion directed in a direction corresponding to each piping direction for each piping direction. Therefore, it is possible to reliably prevent an increase in manufacturing cost due to manufacturing a dedicated cable protection tube for each piping direction.

  In addition, since the bending direction of the bent pipe is changed by rotating the bent pipe formed with the curved portion around the axis of the pipe member and coupling it to the pipe member, the cable bent in the bent pipe or the cable For example, when inserted into a sheath tube within the protective tube body, even if the bending tube receives bending reaction force from each of the sheath tube and the cable, the curved portion of the bending tube cannot be bent by bending reaction force. Because there is no bending reaction force received from the cable or the sheath tube as in the case where the cable protection tube is adapted to change in the piping direction by pivoting another straight tube member connected to the straight tube member as in the prior art Therefore, it is possible to reliably prevent the protection tube body from being bent back.

  According to the second aspect of the present invention, the tubular member and the curved pipe are formed with annular projecting portions projecting outward from the tubular member and the curved pipe, respectively, at the opposite ends thereof. Since the pipes are coupled to each other via the fasteners at both overhang portions, the coupling strength between the pipe member and the curved pipe can be further increased.

  According to the third aspect of the present invention, the plurality of projecting portions projecting toward the other end portion of one end portion of the pipe member and the curved pipe facing each other are arranged around the end surface. A plurality of recesses that can be engaged with the protrusions are formed at positions corresponding to the protrusions on the end surface of the other end. Since the rotation position of the pipe around the axis of the pipe member can be adjusted at predetermined intervals, each protrusion is engaged with each recess at the rotation position of the curved pipe according to the piping direction of the cable protection pipe. By doing so, the bending direction of the bent pipe can be easily made to correspond to the piping direction of the cable protection pipe.

  According to invention of Claim 4, a pipe member has a pipe main body and the cylindrical connection member for connecting this pipe main body and a curved pipe mutually.

  When the tube member consists of a single member, if the overhang or protrusion is formed integrally with the end of the tube member, the overhang and protrusion overhanging the tube member can be loaded, for example, when carrying the cable protection tube. There is a possibility that the projecting portion and the projecting portion of the pipe member that has been touched or caught on the projecting portion and the projecting portion of another tube member may be damaged.

  On the other hand, according to the present invention, as described above, since the pipe member has the pipe main body and the connection member, the cable protection can be achieved by forming the overhanging portion or the projection on the end portion of the connection member. When the tube is transported, the connecting member on which the overhanging portion or the protruding portion is formed is packed in a box such as a corrugated cardboard, and the tube main body can be loaded as in the conventional case. Thereby, it is possible to reliably prevent the overhanging portion and the protruding portion from being damaged as in the case where the overhanging portion or the protruding portion is formed at the end of the tube member made of a single member.

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

  As shown in FIGS. 1 and 2, the cable protection tube 10 according to the present invention includes a protection tube body 11 having a circular cross section.

  The protective tube body 11 is formed of a high-strength synthetic resin material such as hard vinyl chloride, for example, and accommodates the communication cable 12 when the communication cable 12 such as a telephone line is embedded under the road surface. It is used to protect the communication cable 12 from, for example, groundwater. As shown in FIG. 1, the protective tube body 11 includes a linearly extending tube member 13 and a curved tube 15 having a curved portion 14.

  A tube member 13 is coupled to one end portion 15a of the bent tube 15, and an end portion 13a of the tube member 13 of another protective tube body 11 (not shown) is inserted into the other end portion 15b of the bent tube 15. The inner peripheral surface 15c of the other end portion 15b of the bent tube 15 is hermetically sealed between the inner peripheral surface and the tube member 13 of the other protective tube main body 11 inserted into the other end portion 15b. An annular seal member 17 is provided.

  In the illustrated example, the pipe member 13 includes a pipe main body 18 that extends linearly, and a cylindrical connection member 19 for connecting the pipe main body to the curved pipe 15. The end 18 a of the pipe body 18 is inserted into one end 19 a of the connection member 19, and the curved pipe 15 is coupled to the other end 19 b of the connection member 19. The connection member 19 and the pipe body 18 are joined by an adhesive (not shown).

  The ends of the pipe member 13 and the curved pipe 15 facing each other, that is, the other end 19b of the connecting member 19 of the pipe member 13 and the one end 15a of the curved pipe 15 are respectively the outer diameter of the pipe body 18 in the illustrated example. Have approximately equal outer diameters.

  The other end 19 b of the connecting member 19 and the one end 15 a of the bent tube 15 are provided with annular projecting portions 20 and 21 for coupling the tube member 13 and the bent tube 15, respectively. The connecting member 19 and the bent tube 15 are formed so as to protrude outward in the radial direction from the end portion 19 b and the one end portion 15 a of the bent tube 15.

  In the illustrated example, each of the overhang portions 20 and 21 has a distal end of the other end portion 19b of the connecting member 19 and one end of the curved tube 15 so that the protruding portions 20 and 21 can come into contact with each other when the tubular member 13 and the curved tube 15 are coupled. It is formed at the tip of the part 15a. The overhang amounts of the overhang portions 20 and 21 are set to be equal to each other. The distal end surfaces 20a, 21a of the overhang portions 20, 21 are inclined so that the outer diameters of the overhang portions 20, 21 gradually increase toward the direction in which the overhang portions 20, 21 approach each other. The pipe member 13 and the curved pipe 15 are coupled to each other by a fastener 22 at both overhang portions 20 and 21.

  In the coupled state of the pipe member 13 and the curved pipe 15, in the illustrated example, an annular seal member S is provided between the projecting portions 20 and 21 for hermetically sealing between them. Accordingly, underground water, sand, dust, and the like are prevented from entering the protective tube main body 11 from between the tube member 13 and the curved pipe 15 in a state where the protective tube main body 11 is buried under the road surface.

  The fastener 22 for connecting the pipe member 13 and the curved pipe 15 to each other has a pair of semi-cylindrical members 23 in the example shown in FIGS. Each semi-cylindrical member 23 is larger than the outer diameter of the other end portion 19b of the connecting member 19 and the one end portion 15a of the bent tube 15 and smaller than the diameter of the circle defined by the tips of the overhang portions 20 and 21. Has an inner diameter. The width dimension along the axis line of each semi-cylindrical member 23 is equal to each other, and is set to a size that covers at least the two protruding portions 20 and 21 that are in contact with each other. On the inner peripheral surface 23a of each semi-cylindrical member 23, as shown in FIG. 3 (b), grooves 24 each extending along the circumferential direction of each semi-cylindrical member 23 and having a V-shaped cross section are respectively provided. Is formed. The inclination angle of the inner surface 24a of each groove 24 is equal to the inclination angle of the tip surfaces 20a, 21a of the overhang portions 20, 21. As shown in FIG. 3A, each semi-cylindrical member 23 is disposed with its inner peripheral surfaces 23a facing each other so as to form a cylinder in cooperation with each other, and a pair of end portions facing each other in this state. 23b is provided with plate-like connecting portions 25 that extend outward in the radial direction of the respective semi-cylindrical members 23 so as to be parallel to each other and capable of contacting each other. Each connecting portion 25 formed in one semi-cylindrical member 23 is formed with an insertion hole 27 that allows the screw member 26 to pass therethrough in the thickness direction. Further, each connection portion 25 formed in the other semi-cylindrical member 23 is formed with an insertion hole 28 that matches each insertion hole 27 formed in each connection portion 25 of the one half-cylindrical member 23. Yes. Both the semi-cylindrical members 23 are screwed into the insertion holes 27 and 28 so that the connecting members 25 are in contact with each other so that the screw members 26 pass through the other connecting portion 25 from the one connecting portion 25 to each other. Connected.

  When the pipe member 13 and the curved pipe 15 are coupled to each other using the fastener 22, first, the overhang portions 20 and 21 that are in contact with each other via the seal member S described above are connected to one side of the protective tube main body 11 and the other side. The semi-cylindrical members 23 are respectively arranged so as to cover from the side, and both the overhang portions 20 and 21 are fitted in the grooves 24 of the semi-cylindrical members 23, respectively. At this time, as described above, since the inclination angle of the inner surface 24a of each groove 24 is equal to the inclination angle of the distal end surfaces 20a, 21a of the projecting portions 20, 21, the inner surface 24a of each groove 24 is It abuts on the tip surfaces 20a, 21a of the portions 20, 21. Further, as described above, each semi-cylindrical member 23 is larger than the outer diameters of the other end portion 19b of the connecting member 19 and the one end portion 15a of the bent tube 15, and is defined by the tips of the overhang portions 20, 21 respectively. The inner peripheral surface 23a of each semi-cylindrical member 23 is not in contact with the outer peripheral surface of the connecting member 19 of the tube member 13 and the outer peripheral surface of the curved tube 15 between them. The interval is set.

  Next, the screw members 26 are screwed into the insertion holes 27 and 28 of the connecting portions 25 of the semicylindrical members 23 facing each other, and the screw members are tightened. At this time, since there is a gap between the inner peripheral surface 23a of each semi-cylindrical member 23 and the outer peripheral surface of the connecting member 19 of the tube member 13 and the outer peripheral surface of the curved tube 15, the screw members 26 are tightened. As a result, each semi-cylindrical member 23 moves toward the connecting member 19 and the curved pipe 15, whereby a tightening force toward the inside of the protective tube main body 11 acts on each of the overhang portions 20 and 21. As described above, the tip surfaces 20a and 21a of the overhang portions 20 and 21 are inclined so that the outer diameters of the overhang portions 20 and 21 gradually increase toward the direction in which the overhang portions 20 and 21 approach each other. Therefore, a part of the tightening force received by the two overhanging portions 20 and 21 from both the semicylindrical members 23 acts as a pressing force that brings the overhanging portions 20 and 21 closer to each other. As a result, as the screw members 26 are tightened, the two overhanging portions 20 and 21 are pressed against each other, so that the seal member S disposed between the two overhanging portions 20 and 21 is crushed, whereby the both overhanging portions are 20 and 21 is ensured, and the two protruding portions 20 and 21 are pressed against each other, so that rattling between the connecting member 19 of the pipe member 13 and the curved pipe 15 is prevented. By tightening each screw member 26, the connecting member 19 and the curved pipe 15 of the pipe member 13 are coupled to each other by the fasteners 22 at both overhang portions 20 and 21, whereby the pipe member 13 and the curved pipe 15 are coupled to each other. The

  As shown in FIG. 2, the communication cable 12 accommodated in the protective tube main body 11 is branched from, for example, a plurality of trunk cables 29 connecting the telephone stations and the trunk cables, and houses, stores, etc. (not shown) And a plurality of lead-in cables 30 drawn into the building.

  In the protective tube main body 11, in order to separate and accommodate the main cable 29 and the lead-in cable 30 in the protective tube main body, the inside of the protective tube main body 11 is divided into at least two. A separator 31 is provided.

  In the illustrated example, the separator 31 is formed of the same synthetic resin material as that of the protective tube main body 11. The separator 31 extends along the longitudinal direction of the protective tube main body 11, and has a plate-like flat portion 32 inserted into the protective tube main body 11 so as to cross the cross section of the protective tube main body 11, and the width direction of the flat portion And a pair of leaf spring portions 34 extending from the side edge portions 33 facing each other toward the lower side of the flat surface portion 32.

  In the illustrated example, each side edge portion 33 of the flat surface portion 32 is in contact with the inner peripheral surface 18 b of the tube body 18 of the tube member 13 of the protective tube body 11. Thereby, when each drawing cable 30 accommodated in the below-described drawing cable accommodating portion in the protective tube main body 11 is drawn into the building, between each side edge portion 33 and the inner peripheral surface 18b of the tube main body 18. Each drawing cable 30 is prevented from being caught in the gap. Thereby, the breakage of the respective pull-in cables due to the respective pull-in cables 30 being sandwiched in the gaps between the respective side edge portions 33 and the inner peripheral surface 18b of the pipe body 18 is prevented. In addition, each side edge portion 33 of the flat surface portion 32 is inclined upwardly from the flat surface portion 32 so that an angle formed with a tangent at a contact point with the inner peripheral surface 18b of the tube main body 18 becomes an obtuse angle. As a result, when each drawing cable 30 is drawn into the building from the inside of the drawing cable housing portion, each drawing cable 30 is sandwiched between corners defined by the plane portion 32 and the inner peripheral surface 18b of the pipe body 18. It is prevented. Thereby, at the time of retracting each retractable cable 30 from the inside of the protective tube main body 11 to the building, it is possible to reliably prevent the retractable cable from being damaged due to the retractable cable 30 being sandwiched in the corner portion described above. .

  Due to the arrangement of the separator 31 in the protective tube main body 11, the inside of the protective tube main body 11 is divided into two in the vertical direction as seen in the cross section of the protective tube main body. Thereby, inside the protective tube main body 11, a trunk cable housing portion 35 for housing each trunk cable 29 is defined on the one side of the plane portion 32, and each lead-in cable is defined on the other side of the plane portion 32. The above-described lead-in cable housing portion 36 for housing 30 is defined. In the trunk cable housing portion 35, a plurality of sheath tubes 37 into which the trunk cables 29 are inserted one by one are housed.

  Each leaf spring portion 34 is curved with a curvature substantially equal to the curvature of the inner peripheral surface 18b of the tube body 18 along the extending direction, and each leaf spring is in the inserted state of the separator 31 into the protective tube body 11. The portion 34 is in close contact with the inner peripheral surface 18b of the pipe body 18. As a result, the frictional force generated between the surface 34a of each leaf spring portion 34 facing the inner peripheral surface 18b of the tube main body 18 and the inner peripheral surface 18b of the tube main body 18 increases, so that the separator 31 is protected by the separator 31. The rotation of the separator 31 around the axis of the protective tube main body 11 is suppressed when a force to rotate around the axis of the tube main body 11 is applied.

  Each leaf spring portion 34 is arranged on each side of the flat surface portion 32 so that the interval between the leaf spring portions 34 is larger than the state in which the leaf spring portions 34 are not in the protective tube main body 11 in close contact with the inner peripheral surface 18b of the tube main body 18. It is formed at the edge 33. As a result, in a state where the separator 31 is inserted into the protective tube main body 11, a force that pushes the diameter from the inside acts on the tube main body 18 from each leaf spring portion 34. When an elastic force acts on the pipe body 18 from each leaf spring portion 34, a reaction force is applied to the planar portion 32 from the protective tube body 11 via each leaf spring portion 34 so that the planar portion 32 is compressed from both sides. Since it acts as a force, rattling of the separator 31 in each protection tube main body 11 is prevented.

  Between the tube main body 18 of the protective tube main body 11 and the separator 31, a rotation preventing means 40 for preventing the separator from rotating around the axis of the tube main body 18 is provided.

  In the illustrated example, the rotation preventing means 40 includes a pair of recesses 38 formed on a surface 34 a located on the outer side of each leaf spring portion 34 of the separator 31, and an inner peripheral surface 18 b of the pipe body 18. A pair of protrusions 39 that protrude from the surface toward the inside of the tube main body 18 and can be engaged with the recesses 38 of the leaf spring portions 34 are formed. In the illustrated example, each recess 38 extends in parallel to each other along the longitudinal direction of the separator 31 on the surface of each leaf spring portion 34, and each protrusion 39 in the illustrated example corresponds to the tube body 18. And extend parallel to each other along the longitudinal direction of the.

  When the separator 31 is installed in the protective tube main body 11, the plate spring portions 34 of the separator 31 are bent in a direction approaching each other, and the protrusions 39 formed on the tube main body 18 in the concave portions 38 of the plate spring portions 34. And the separator 31 is pushed into the protective tube main body 11, thereby inserting the separator 31 into the protective tube main body 11. At this time, since each concave portion 38 and each projection portion 39 are formed so as to be parallel to each other as described above, each concave portion 38 is set to each concave portion 38 when the separator 31 is inserted into the protective tube body 11. By guiding along the protrusion 39, the separator 31 can be easily inserted into the protective tube main body 11. Due to the engagement of each recess 38 with each projection 39, the separator 31 is not rotatable relative to the tube body about its axis in the tube body 18 and is in the bent tube 15 with respect to the bent tube. It is fixed within the tube body 18 so as to be relatively rotatable about the axis of the curved tube. Thereby, the separator 31 is installed in the protective tube main body 11.

  The protection tube main body 11 is embedded under the road surface in a state where the inside thereof is divided into upper and lower portions when viewed in a cross section by a separator 31. When adjusting the bending direction of the bent tube 15 in this state, by loosening the screw members 26 that connect the semi-cylindrical members 23 of the fastener 22 to each other, the semi-cylindrical members 23 are connected to the projecting portions 20 and 21. Reduce the applied tightening force. Next, the bent tube 15 is rotated around the axis of the tube member 13 by guiding the overhanging portion 21 formed in the bent tube 15 along the groove 24 in the semi-cylindrical members 23. After the bending tube 15 is rotated to the rotation position where the bending direction of the bending tube 15 is directed to the desired bending direction, each screw member 26 is tightened again, thereby coupling the bending tube 15 to the tube member 13 at the desired rotation position. .

  According to the present embodiment, as described above, the protective tube body 11 includes the tube member 13 and the curved tube 15 having a curved portion, and the separator 31 is connected to the tube body 18 of the tube member 13. The tube 15 is fixed around the axis of the main body so as not to rotate relative to the bent tube 15 and is rotatable relative to the bent tube 15 about the axis of the bent tube. The bent tube 15 has a predetermined axis around the axis of the tube member 13. Since it is coupled to the pipe member 13 at the rotational position, the separator 31 is kept in a state where the separator 31 is arranged in the pipe member 13 so as to divide the protective pipe main body 11 into the upper and lower parts when viewed in cross section. The tube 15 can be coupled to the tube member 13 by rotating around the axis of the tube member 15 so that the bending direction thereof is in a desired direction.

  Thereby, when it is necessary to change the piping direction of the cable protection tube 10 according to the laying direction of the communication cable 12, the bending tube 15 is piped at a rotational position where the bending direction of the bending tube 15 faces the piping direction of the cable protection tube 10. By connecting to the member 13, the rotation direction of the separator 31 around the axis of the protection tube main body 11 does not deviate from an appropriate rotation posture that divides the inside of the protection tube body 11 up and down. It is possible to easily cope with changes.

  Accordingly, since the cable protection tube 10 can be provided with versatility, it is necessary to manufacture a conventional dedicated cable protection tube having a curved pipe portion directed in a direction corresponding to each piping direction for each piping direction. Therefore, it is possible to reliably prevent an increase in manufacturing cost by manufacturing a dedicated cable protection tube for each piping direction.

  Further, since the bent tube 15 formed with the curved portion 14 is rotated around the axis of the tube member 13 so that the cable protection tube 10 can be adapted to the change in the piping direction, the bent tube 15 is bent in the bent tube. Even if a bending reaction force is received from the communication cable 12 or the sheath tube 37, the bending portion 14 of the bending tube 15 is not bent by the bending reaction force. By pivoting the tube member, it is possible to reliably prevent the protection tube body from being bent back due to the bending reaction force received from the communication cable 12 or the sheath tube 37 as in the case where the cable protection tube is adapted to change of the piping direction. it can.

  Further, as described above, the annular projecting portion 20 projecting outward from the connecting member 19 and the curved pipe 15 to the other end portion 19b of the connecting member 19 of the pipe member 13 and the one end portion 15a of the curved pipe 15, respectively. 21 is formed, and the pipe member 13 and the curved pipe 15 are coupled to each other via the fasteners at the two overhang portions 20 and 21, so that the coupling strength between the pipe member 13 and the curved pipe 15 is further increased. be able to.

  Furthermore, as described above, the pipe member 13 includes the pipe main body 18 and the connection member 19 for connecting the pipe main body 18 and the curved pipe 15 to each other.

  When the tube member 13 is formed of a single member, when the overhang portion 20 is formed integrally with the end portion of the tube member 13, the overhang portion 20 that protrudes from the tube member 13 is loaded when the cable protection tube 10 is transported, for example. There is a possibility that the pipe member 13 that has been brought into contact with or caught on the overhanging portion 20 of the other pipe member 13 may be damaged.

  On the other hand, according to the present invention, as described above, the pipe member 13 includes the pipe body 18 and the connection member 19, and the overhanging portion 20 is formed at the other end portion 19b of the connection member. Therefore, when the cable protection tube 10 is transported, the connecting member 19 on which the overhanging portion 20 is formed is packed in a box such as a corrugated cardboard, and the tube main body 13 can be loaded as in the conventional case. Thereby, it can prevent reliably that the overhang | projection part 20 is damaged like the case where the overhang | projection part 20 is formed in the edge part of the pipe member which consists of a single member.

  In the present embodiment, when the pipe member 13 and the curved pipe 15 are coupled, end surfaces 20b and 21b of the overhang portions 20 and 21 facing each other, as shown in FIG. A wave portion 41 undulating along the direction can be formed.

  In this case, when the pipe member 13 and the curved pipe 15 are coupled, the peak of the wave portion 41 of the one overhang portion 20 and the valley of the wave portion 41 of the other overhang portion 21 are engaged with each other. Thus, when a rotational force that rotates around the axis of the tube member 13 is applied to the curved tube 15 coupled to the tube member 13, the rotational force compresses the crests of the wave portions 41 from the side. Since it is received as a force, the bent tube 15 is prevented from rotating around the axis of the tube member 15 in a coupled state to the tube member 15.

  Further, the crest of the wave portion 41 is aligned with the trough of the wave portion 41 at every interval between the crest and the crest of the wave portion 41 when the curved pipe 15 is rotated around the axis of the tube member 13. As a result, the bending position of the curved pipe 15 can be adjusted at intervals between the peaks of the wave portion 41.

  In the present embodiment, an example in which the outline of each of the overhang portions 20 and 21 is circular has been shown, but instead of this, as shown in FIG. 5, each overhang portion is formed so that the outline forms a polygon. 20 and 21 (FIG. 5 shows the overhang portion 20 formed on the connecting member 19).

  In this case, for example, when the projecting portions 20 and 21 are formed so that the outer shell forms a hexagon, when the semicylindrical members 23 of the fasteners 22 are connected to each other by the screw members 26, the cross section is jointly formed. Each semi-cylindrical member 23 can be bent along the front end surfaces 20a and 21a of the overhang portions 20 and 21 so as to form a hexagonal cylindrical shape.

  According to the example shown in FIG. 5, the protruding portions 20 and 21 are aligned with each other each time the bent tube 15 is rotated 60 ° around the axis of the tube member 13. Therefore, the bending position of the curved pipe 15 can be adjusted every 60 ° around the axis of the pipe member 13.

  Further, in the present embodiment, the example in which the fastener 22 has the semi-cylindrical members 23 arranged so as to sandwich the overhanging portions 20 and 21 in the radial direction is shown, but instead of this, A fastener having a pair of annular members arranged so as to sandwich the protruding portions 20 and 21 in the axial direction thereof can be applied to the present invention.

  Further, in the present embodiment, the example in which the pipe member 13 and the curved pipe 15 are coupled to each other by the fasteners 22 at the respective overhang portions 20 and 21 is shown. 21, a plurality of screw holes penetrating the both overhanging portions in the axial direction are formed at predetermined intervals in the circumferential direction of the overhanging portions 20, 21, and screw members are screwed into the respective screw holes. By joining, the two overhanging portions 20 and 21 can be joined to each other, whereby the pipe member 13 and the curved pipe 15 can be joined to each other.

  In the example shown in FIGS. 1 to 5, the example in which the connecting member 19 and the curved pipe 15 of the pipe member 13 are connected to each other by the fastener 22 is shown, but instead of this, as shown in FIG. A plurality of projecting portions 42 projecting from the end surface toward the one end portion 15a of the curved pipe 15 are provided at predetermined intervals in the circumferential direction of the end surface 19c on the end surface 19c of the other end portion 19b of the connecting member 19 of the tube member 13. A plurality of recesses 43 that can be engaged with the projections 42 are formed on the end surface 15d of the one end 15a of the bent tube 15 at positions corresponding to the projections 42, and the projections 42 are formed in the recesses 43. By engaging, the connecting member 19 and the bent pipe 15 can be connected to each other.

  In the example shown in FIG. 6, four protrusions 42 are formed at equal intervals on the end surface 19 c of the connection member 19, and each protrusion 42 extends along the circumferential direction of the end surface 19 c of the connection member 19. A trapezoidal shape in which the width dimension gradually increases toward the curved pipe 15 is formed. Each recess 43 is formed to have a trapezoidal shape in which the width dimension along the circumferential direction of the end surface 15 d of the curved pipe 15 gradually decreases toward the connection member 19 so as to be aligned with each projection 42. Yes.

  According to the example shown in FIG. 6, since the four projecting portions 42 are formed on the end surface 19 c of the connecting member 19 at equal intervals, each concave portion 43 has the bent tube 15 around the axis of the tube member 13. Align with each protrusion 42 every 45 °. Thereby, the bending position of the curved pipe 15 can be adjusted every 45 ° around the axis of the pipe member 13.

  Further, each protrusion 42 has a trapezoidal shape in which the width dimension along the circumferential direction of the end surface 19 c of the connection member 19 gradually increases toward the curved tube 15, and each concave portion 43 includes the end surface 15 d of the curved tube 15. In the state where each projection 42 is engaged with each recess 43, for example, the curved pipe 15 is connected to the curved pipe. When the rotational force that rotates the tube member 13 around the axis of the tube member 13 is applied, the rotational force is applied to each protrusion 42 as a compression force that compresses the protrusion 42 in the circumferential direction of the end surface 19c of the connecting member 19. Since it acts from the side surface of the concave portion 43, the rotational force is received by each projection portion 42. Thereby, the rotation around the axis line of the pipe member 13 of the bent pipe 15 by the rotational force can be prevented. Further, when an external force is applied to the curved pipe 15 in a direction in which the curved pipe is separated from the connection member 19, the compression force that compresses each projection 42 in the axial direction of the connection member 19 is applied to each projection 42. As described above, the external force is received by each projection 42. Thereby, it can prevent that engagement of each projection part 42 and each recessed part 43 is cancelled | released by the said external force.

  Further, in the example shown in FIGS. 1 to 6, an example in which the pipe body 18 of the pipe member 13 extends linearly is shown, but instead, for example, a pipe body in which a curved portion is formed is applied to the present invention. be able to.

  In the example shown in FIGS. 1 to 6, the separator 31 is fixed in the tube body 18 of the protective tube body 11 by the rotation preventing means 40. The separator 31 can be fixed in the tube body 18 by adhering the surface 34 a to the inner peripheral surface 18 b of the tube body 18 of the protective tube body 11 with an adhesive.

  Further, in the example shown in FIGS. 1 to 6, the example in which the present invention is applied to the cable protective tube 10 that guides the communication cable 12 simply buried under the road surface in the ground is shown. For example, although not shown, the present invention can be applied to a cable protection tube using a well-known common wire groove. In this case, the separator 31 according to the present invention can be provided on the protection tube main body that guides the trunk cable 29 and the lead-in cable 30 that extend underground from the electric wire joint groove embedded under the road surface.

It is a longitudinal section showing a cable protection tube concerning the present invention roughly. It is a cross-sectional view along the II line of FIG. (A) is a top view which shows schematically the fastener concerning this invention, (b) is a cross-sectional view along the II-II line of (a). It is a side view which shows roughly the modification of FIG. It is a side view which shows roughly the modification of the fastener which concerns on this invention. It is a side view which shows roughly the modification of FIG. 1 different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cable protective tube 11 Protective tube main body 13 Pipe member 15 Curved pipe 18 Pipe main body 19 Connection member 20, 21 Overhang | projection part 22 Fastener 12 Cable (communication cable)
31 Separator 42 Projection 43 Recess

Claims (4)

  A cable protection tube for protecting a cable, the tube having a tube member and a bent tube connected to the tube member, the protection tube main body being disposed in the protection tube body, and the cable being placed in the protection tube body A separator for partitioning the inside of the protective tube main body into at least two pipelines for individual accommodation, and the separator is fixed to the tube member so as not to rotate relative to an axis of the tube member. And is rotatable relative to the bent tube about an axis of the bent tube, the bent tube being coupled to the tube member at a predetermined rotational position about the axis of the tube member. Cable protection tube to play.   The pipe member and the curved pipe are formed with annular projecting portions that project outward from the pipe member and the curved pipe, respectively. The cable protection pipe according to claim 1, wherein the cable protection pipe is coupled to each other via a fastener at the overhanging portion.   A plurality of projecting portions projecting toward the other end portion of the end portions of the tube member and the curved pipe facing each other have a predetermined interval in the circumferential direction of the end surface. A plurality of recesses that can be engaged with the respective protrusions are formed at positions corresponding to the respective protrusions, on the end surface of the other end, The cable protection tube according to claim 1 or 2, wherein a rotational position around an axis of the tube member is adjustable at predetermined intervals.   The cable protection according to any one of claims 1 to 3, wherein the pipe member includes a pipe main body and a cylindrical connection member for connecting the pipe main body and the curved pipe to each other. tube.

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