JP5470110B2 - Branch fitting - Google Patents

Description

  The present invention relates to a branch pipe joint, and more particularly to a branch pipe joint for connecting a main pipe and a branch pipe of a cable protection pipe that accommodates and protects a cable.

  Conventionally, when a cable such as a communication line or a power line is buried in the ground, a cable protection tube for protecting the cable has been used.

  For example, when a cable embedded in a road is drawn into a building built on the side of the road, it is necessary to branch the main pipe of the cable protection pipe and to provide a branch pipe extending in the direction of the building (that is, in the lateral direction). In such a case, a branch pipe joint for connecting the main pipe and the branch pipe is used. Various types of branch pipe joints have been proposed, but cable protection pipes are buried in the ground, and it is necessary to dig around the cable protection pipes when performing installation work, etc. In consideration, it is desirable that the branch pipe joint can be connected to the upper half of the main pipe and does not protrude upward from the top of the main pipe.

Patent Document 1 discloses an example of a branch pipe joint for branching a main pipe in a lateral direction. The branch pipe joint of Patent Document 1 is a joint for connecting a branch pipe to an opening provided obliquely above the main pipe, and includes a saddle part and a branch pipe part (branch pipe part). The saddle portion has a branch opening that opens obliquely upward, and the branch pipe portion extends in the horizontal direction perpendicular to the tube axis of the main tube, and then passes through the bent portion and extends along the tube axis direction of the main tube. The saddle portion is provided so as to extend in the horizontal direction. In this way, by projecting the branch pipe portion in the horizontal direction from the oblique upper part of the main pipe, the branch pipe section (and hence the branch pipe) can be prevented from projecting upward from the top of the main pipe. The burial depth can be reduced.
Patent No. 4420499 [F16L 41/02]

  However, in the branch pipe joint of Patent Document 1, the branch pipe portion extends in a direction perpendicular to the pipe axis of the main pipe, and then bends at a right angle and extends in the pipe axis direction of the main pipe. Further, a bent pipe (branch pipe) that is bent at a right angle is connected to an end of the branch pipe portion. For this reason, when the cable is pulled in, the resistance when the wiring jig or cable passes through the branch pipe increases, and the wiring jig may be caught or excessive tension may be applied to the cable. was there. In addition, there is a problem that a cable to be newly drawn becomes entangled with an existing cable or causes a dive and the tension applied to the cable increases. That is, it was difficult to carry out the cable pull-in operation.

  Therefore, the main object of the present invention is to provide a novel branch pipe joint.

  Another object of the present invention is to provide a branch pipe joint capable of easily performing a cable pull-in operation.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses and supplementary explanations indicate correspondence with embodiments described later in order to help understanding of the present invention, and do not limit the present invention.

A first invention is a branch pipe joint that connects a main pipe and a branch pipe of a cable protection pipe that accommodates and protects a cable. The saddle section and the saddle section that are attached in close contact with the outer surface of the main pipe A branch pipe part that protrudes in a direction that is horizontal from the saddle part and is at an acute angle with respect to the pipe axis of the main pipe when attached to the pipe, and a branch hole and a branch pipe that are formed obliquely above the main pipe and internal parts are formed on the saddle so as to communicate, e Bei openings extending in a direction oblique to the tube axis of the main pipe, the new branch cables when retracted new branch cable in the branch pipe The position of the line that passes through the opening of the saddle part is the upper position of the lower side edge of the opening, and the position of the line at the opening of the saddle part of the existing branch cable that has been pulled into the branch pipe is , it moves to the bottom position of the opening, the branch pipe joint A.

  In the first invention, the branch pipe joint (10) includes a saddle part (12) and a branch pipe part (14), and extends in a direction transverse to the main pipe (20) of the cable protection pipe. Used to connect The saddle portion is formed in a curved plate shape that curves along the outer surface of the main pipe, and is attached to the outer surface of the main pipe. The branch pipe part is formed on the outer surface of the saddle part, and is formed so as to protrude in an acute angle with respect to the pipe axis of the main pipe and extend in the horizontal direction with the saddle part attached to the main pipe. The saddle portion is formed with an opening (16) for communicating the main branch hole (38) with the inside of the branch pipe portion. The opening has a shape extending in an oblique direction with respect to the pipe axis of the main pipe.

  When the main pipe and the branch pipe are connected using such a branch pipe joint, the branch pipe portion is formed so as to protrude at an acute angle from the main pipe when the branch cable (36, 36a) is newly drawn. Therefore, the wiring jig is not caught by the branch pipe part. For this reason, it is possible to easily perform the insertion work of the wiring jig and the drawing operation of the new branch cable.

  In addition, when the drawing tension is applied to the line strings (36a, 40), the opening is formed so as to extend obliquely with respect to the tube axis of the main pipe. The branch pipe is pulled up to a substantially pipe axis height so as to ride on the lower side edge (16a) of the opening. On the other hand, the branch cable (36, 36b) released from the pulling tension after the pulling operation is completed moves to the bottom of the opening by its own weight. That is, the line string and the like are pulled with the existing branch cable separated in the upward and axial directions. Therefore, a new branch cable can be easily pulled in without applying a load to the existing branch cable.

  According to the first aspect of the present invention, it is possible to easily pull in a new branch cable without affecting or affecting the existing branch cable.

A second invention is a branch pipe joint for connecting a main pipe and a branch pipe of a cable protection pipe that accommodates and protects a cable, and the saddle section and the saddle section that are attached in close contact with the outer surface of the main pipe A branch pipe part that protrudes in a direction that is horizontal from the saddle part and is at an acute angle with respect to the pipe axis of the main pipe when attached to the pipe, and a branch hole and a branch pipe part that are formed at an oblique upper portion of the main pipe is formed of an internal saddle portion so as to communicate, Bei give a separating portion formed on the lower side edge of the extending opening, and the opening in a direction oblique to the tube axis of the main pipe, the separation unit, the branch pipe When a new branch cable is being pulled in, the new cable insertion part, which is the passage position when the new branch cable passes through the opening of the saddle part, and the existing branch cable that has been pulled into the branch pipe Existing cable that is the position of the wire at the opening of the saddle Separating the lifting portion, a branch pipe joint.

  In the second invention, similarly to the first invention, the branch pipe joint (10) includes a saddle portion (12) and a branch pipe portion (14). An opening (16) for communicating the branch hole (38) of the main pipe (20) and the inside of the branch pipe section is formed in the saddle portion, and this opening is oblique with respect to the pipe axis of the main pipe. It has a shape extending to Also, in the opening, a new cable insertion part (42) through which a string to which pulling tension acts (36a, 40) passes, and an existing cable holding part through which a branch cable (36, 36b) released from the pulling tension passes. (44) and a separation part (46) are formed. Therefore, a new branch cable can be easily pulled in without applying a load to the existing branch cable.

  According to the second invention, similarly to the first invention, it is possible to easily pull in a new branch cable without affecting or affecting the existing branch cable.

A third invention is according to the first or second aspect, is disposed in the opening side of the protruding direction opposite side of the branch pipe portion, further example Bei the collision raised portion that protrudes from the inner surface of the saddle portion, the protrusion When the new branch cable is drawn into the branch pipe, the new branch cable is passed through the upper surface of the projection, and the side edge of the branch hole formed in the main pipe Prevent contact.

In the third invention, the saddle portion (12) is formed with a projection ( 18 ) projecting radially from the inner surface thereof. The protrusion is arranged at a position next to the opening (16) and opposite to the protruding direction of the branch pipe (14).

  When the main pipe and the branch pipe are connected using such a branch pipe joint, when the branch cable (36, 36a) is newly drawn, the wiring string (36a, 40) is connected to the upper surface (18a) of the protrusion. ) Pass over. At this time, the position of the line string or the like is restricted by the protrusion in the main pipe radial direction, and contact with the side edge of the branch hole (38) of the main pipe (20) is avoided.

  According to the third aspect of the present invention, contact between the line string or the like and the branch hole side edge of the main pipe can be avoided, so that the line string or the like can be prevented from being caught or damaged.

  According to the present invention, since the push-in and pull-in of the wiring jig is not hindered by the existing branch cable, a new branch cable can be easily pulled in.

  The above object, other objects, features, and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is a longitudinal cross-sectional view which shows the use condition of the branch pipe coupling which is one Example of this invention. It is a top view which shows the use condition of the branch pipe coupling which is one Example of this invention. It is a partial cross section figure which shows the use condition of the branch pipe coupling which is one Example of this invention. It is a front view which shows the branch pipe coupling which is one Example of this invention. It is a side view which shows the saddle part outer surface side of the branch pipe coupling of FIG. It is a side view which shows the saddle part inner surface side of the branch pipe coupling of FIG. It is a top view which shows the mode of the transmission line string etc. at the time of branch cable drawing. It is a fragmentary cross-sectional view which shows the state of the wiring string etc. at the time of branch cable drawing. It is a fragmentary cross-sectional view which shows the positional relationship of the wiring string etc. at the time of branch cable drawing-in, and the existing cable. It is an illustration figure which shows a mode that the positional relationship shown in FIG. 9 was seen from the main pipe inside to the pipe-axis direction. It is a front view which shows the branch pipe coupling which is another Example of this invention. It is a side view which shows the saddle part inner surface side of the branch pipe coupling of FIG. It is a fragmentary cross-sectional view which shows the positional relationship of the wiring string etc. at the time of branch cable drawing-in, and the existing cable at the time of using the branch pipe coupling of FIG. It is a fragmentary cross-sectional view which shows an example of the left-right asymmetric branch hole formed in a main pipe.

  With reference to FIGS. 1-3, the branch pipe joint 10 which is one Example of this invention contains the saddle part 12 and the branch pipe part 14, and connects the branch pipe 22 with respect to the main pipe | tube 20 of a cable protection pipe. Used for. The cable protection pipe is a pipe for accommodating a cable such as a communication line or a power line buried in the ground and protecting the cable. The main pipe 20, the branch pipe 22, and the main pipe 20 and the branch pipe 22. And the like, and the like. In the following description, the branch pipe joint 10 used for the cable protection pipe that accommodates the communication cable will be described as an example. However, the use of the branch pipe joint 10 is not limited to this.

  The main pipe 20 is, for example, a pipe buried in the ground along the road, and is formed of a synthetic resin such as hard vinyl chloride. The inner diameter of the main pipe is, for example, 175 mm. The main pipe 20 is provided with a separator 28 that divides the inside of the main pipe 20 into an upper space 24 and a lower space 26. The upper surface of the separator 28, that is, the bottom surface of the upper space 24 has an inclined surface 30 that extends from the vicinity of the tube axis of the main tube 20 to the inner surface of the main tube 20 obliquely upward. A plurality of sheath tubes 32 are inserted into the lower space 26.

  The communication cable accommodated in the main pipe 20 includes, for example, a trunk cable 34 that connects telephone offices, and a branch cable 36 that is branched from the trunk cable 34 and drawn into the building. In the sheath pipe 32 provided in the lower space 26 of the main pipe 20, the trunk cable 34 is individually accommodated, and in the upper space 24 of the main pipe 20, a plurality of branch cables 36 are accommodated. The branch cable 36 is guided by the inclined surface 30 of the separator 28 and is passed through the center of the bottom of the upper space 24 and the vicinity thereof.

  Further, a substantially rectangular branch hole 38 extending in the tube axis direction of the main pipe 20 is formed at an oblique upper portion of the pipe wall of the main pipe 20. The branch hole 38 is an opening that communicates the upper space 24 with the outside of the main pipe 20. When the branch cable 36 is drawn into the building, the branch cable 36 is drawn from the upper space 24 into the branch pipe joint 10 and the branch pipe. Used to take out in 22. The size of the branch hole 38 is, for example, a circumferential length of 100 mm and an axial length of 300 mm.

  The branch pipe 22 is, for example, a pipe that branches from the main pipe 20 in the lateral direction and extends into the building or the like, and is formed of a synthetic resin such as hard vinyl chloride. The branch pipe 22 includes a bent pipe (65 ° bent pipe in this embodiment) connected to the branch pipe joint 10, and one or a plurality of pipes 22 from the main pipe 20 through the branch pipe joint 10 are included in the branch pipe 22. The branch cable 36 is drawn. The inner diameter of the branch pipe 22 is, for example, 50 mm.

  The branch pipe joint 10 is a joint for connecting the main pipe 20 and the branch pipe 22 and is formed by secondary processing such as injection molding using a hard vinyl chloride resin or press molding.

  As shown in FIG. 4-6, the branch pipe joint 10 includes a saddle part 12 and a branch pipe part 14, and is attached to an oblique upper part of the main pipe 20. The saddle portion 12 is formed in a substantially rectangular curved plate shape that curves along the outer surface of the main pipe 20 and extends in the pipe axis direction of the main pipe 20. The size of the saddle portion 12 is a size that completely covers the branch hole 38 of the main pipe 20. When attaching the branch pipe joint 10 to the main pipe 20, for example, the upper side edge of the saddle portion 12 is positioned and positioned along the pipe top of the main pipe 20, and the outer surface of the main pipe 20 around the branch hole 38 is positioned. The inner surface of the saddle portion 12 is watertightly connected by adhesive bonding or the like.

  On the outer surface of the saddle portion 12, the saddle portion 12 (branch pipe joint 10) is attached to the main pipe 10, and protrudes at an acute angle with respect to the pipe axis direction of the main pipe 20 and extends in the horizontal direction. A branch pipe portion 14 is formed. Further, the end portion of the branch pipe portion 14 is formed in a reduced diameter opening shape. The take-out angle α (see FIG. 2) of the branch pipe portion 14 is preferably set to an angle at which the branch cable 36 can be pulled in smoothly, for example, 15 to 45 °. Further, the attachment angle β (see FIG. 4) of the branch pipe part 14 can be connected so as to communicate with the upper space 24 of the main pipe 20, and the top of the branch pipe part 14 does not become higher than the top of the main pipe 20. For example, the angle is set to 25 to 45 °. In this embodiment, the take-out angle α of the branch pipe portion 14 is 25 °, and the attachment angle β is 30 °.

  Further, the saddle portion 12 is formed with an opening 16 for communicating the branch hole 38 (that is, the upper space 24) of the main pipe 20 and the inside of the branch pipe portion 14. The opening 16 has a substantially oval shape extending obliquely with respect to the tube axis of the main pipe 20 in a state where the saddle portion 12 is attached to the main pipe 20, and is approximately sized to fit within the branch hole 38 of the main pipe 20. (See FIG. 3). The side edge of the opening 16 smoothly connects the inner surface of the saddle portion 12 and the inner surface of the branch pipe portion 14, and the lower side edge (lower side edge) 16 a thereof extends in the protruding direction of the branch pipe portion 14. It becomes an inclined surface which inclines below as it goes.

  Hereinafter, a method of connecting the main pipe 20 and the branch pipe 22 using the branch pipe joint 10 as described above and newly connecting the branch cable 36 (drawing into the building or the like) will be described.

  First, a connection method for connecting the main pipe 20 and the branch pipe 22 using the branch pipe joint 10 will be described. When connecting the main pipe 20 and the branch pipe 22, first, a diagonal position of the main pipe 20 at a desired position in the pipe axis direction of the main pipe 20, for example, a position where the branch cable 36 can be routed to the inside of the building at the shortest distance. The upper tube wall is cut into a substantially rectangular shape to form a branch hole 38 having a desired size. The side edge of the branch hole 38 is appropriately chamfered using a file or the like.

  Next, the branch pipe joint 10 is attached to the outer surface of the main pipe 20 by adhesive bonding or the like. At this time, an adhesive (bonding agent) is applied to the outer surface of the main pipe 20, the inner surface of the saddle portion 12, or predetermined portions of both. Thereafter, at a predetermined position where the opening 16 of the branch pipe joint 10 comes to the branch hole 38 of the main pipe 20, the outer surface of the main pipe 20 and the inner face of the saddle portion 12 are in close contact with each other, and are fixed using a fixing band or the like. . In this embodiment, if the upper side edge of the saddle portion 12 is arranged along the top of the main pipe 20, the circumferential positioning is performed automatically. Further, the positioning in the axial direction may be performed, for example, by previously forming a mark such as a protrusion on the outer surface of the saddle portion 12 and aligning the mark with the end of the branch hole 38 of the main pipe 20.

  After attaching the branch pipe joint 10 to the main pipe 20, the end part of the branch pipe part 14 is inserted into the end part of the branch pipe 22 and connected by adhesive bonding or the like, thereby connecting the main pipe 20 and the branch pipe 22. Exit. As a result, a pipe branching from the upper space 24 of the main pipe 20 and bending at right angles to the pipe axis of the main pipe 20 and extending in the horizontal direction is formed (see FIGS. 1 and 2).

  When the connection work between the main pipe 20 and the branch pipe 22 is completed, the branch cable 36 is subsequently pulled in using a wiring jig. As the wiring jig, a conventionally known tool including a wiring rod (not shown), a wiring string 40, and a spherical expansion / contraction portion (not shown) that can be freely expanded and contracted may be used.

  When the branch cable 36 is retracted, first, a through rod having a spherical expansion / contraction portion attached to the tip from one end of the branch pipe 22 is inserted, and the spherical expansion / contraction portion is inserted into a hand hole (not shown). Continue pushing the connecting rod until it reaches. At this time, since the branch pipe portion 14 is formed in a straight tube shape projecting at an acute angle from the saddle portion 12 (main pipe 20), the spherical expansion / contraction portion or the like is easily caught without being caught by the branch pipe portion 14. Can be inserted. The handhole is also referred to as a special portion or a connecting rod, and is a rod provided at an appropriate interval in the axial direction of the main pipe 20 and is used for drawing a cable, performing inspection work, or connecting cables. It is a spear.

  When the spherical expansion / contraction portion reaches the hand hole, the spherical expansion / contraction portion is removed from the wire rod, and instead, the wire string 40 for drawing the branch cable 36 is attached to the wire rod. Then, the wire rod is pulled back, and the wire string 40 is pulled to one end of the branch pipe 22. Further, a lubricant is applied to the newly drawn branch cable 36, that is, the new cable 36a, and the new cable 36a is connected to the end of the hand string side of the line string 40 via a twisted return, and the line string 40 is connected to the branch line 22 Pull back from the side edge. As a result, the new cable 36a is pulled by the line string 40, and from the hand hole through the main pipe 20 (the upper space 24 and the branch hole 38) and the branch pipe joint 10 (the opening 16 and the branch pipe section 14), It is drawn to one end of the branch pipe 22. Also in this case, since the branch pipe portion 14 is formed in a straight tube projecting from the saddle portion 12 at an acute angle, the wire passing jig and the new cable 36a can be easily pulled in without being caught by the branch pipe portion 14. It can be carried out.

  Further, when the new cable 36a is pulled in, as shown in FIG. 7, since the pipe line from the branch pipe portion 14 to the branch pipe 22 is curved in the horizontal direction from the main pipe 20, The same applies to the wire rod and the subsequent new cable 36a (hereinafter, sometimes referred to collectively as "wire string 40, etc.") receives a force toward the inside of the curve. When the force toward the inside of the curve is received, the opening 16 is formed so as to extend in an oblique direction with respect to the tube axis of the main pipe 20, and therefore, as shown in FIG. The pipe axis height of the branch pipe 22 (branch pipe part 14) is raised (or close to the height) so as to ride on the inside of the curve of the lower side edge 16a. That is, when the drawing tension is applied, the line string 40 or the like is on the lower side edge 16a of the opening 16 when passing through the opening 16 of the branch pipe joint 10, and is substantially the tube axis of the branch pipe 22. Pass through the height position.

  On the other hand, the branch cable 36 released from the drawing tension after the drawing operation, that is, the existing cable 36b, is inclined to the bottom (outside of the curve) of the opening 16 by its own weight because the lower side edge 16a of the opening 16 is inclined. It moves and passes through the bottom of the opening 16 (see FIG. 3).

  Thereafter, similarly, a desired number of branch cables 36 are drawn into the same branch pipe 22. However, as described above, the passage string 40 and the like are opened when passing through the opening 16 of the branch pipe joint 10. 16 on the lower side edge 16a and passes through the position of the pipe axis height of the branch pipe 22 (new cable insertion part 42). On the other hand, the existing cable 36b for which the drawing operation has been completed passes through the bottom of the opening 16 (the existing cable holding portion 44). That is, as shown in FIGS. 9 and 10, when the new cable 36a is pulled in, the wire string 40 and the like are pulled upward and axially separated from the existing cable 36b, that is, the new cable is inserted. Since the separating portion 46 is formed between the portion 42 and the existing cable holding portion 44, the passage string 40 and the like are prevented from entering under the existing cable 36b, and the drawing operation is affected by the existing cable 36b. Absent.

  If the line string 40 or the like gets under the existing cable 36b, the line string 40 or the like gets entangled with the existing cable 36b or receives a frictional force from the existing cable 36b, so that the drawing operation becomes difficult. . In addition, normally, the existing cable 36b is lifted in the branch hole 38 of the main pipe 20 and the opening 16 of the branch pipe joint 10, and a gap is formed below the existing cable 36b. However, in this embodiment, it is possible to prevent the passage string 40 or the like from entering under the existing cable 36b.

  Further, since the existing cable 36b released from the pulling tension moves so as to slide on the lower side edge 16a of the opening 16, it is arranged relatively neatly at the bottom of the opening 16 (existing cable holding part 44) in the laying order. That is, since the existing cable 36b is not randomly routed through the route (the new cable insertion portion 42) when the new cable 36a is pulled in, it is easy even when the number of the existing cables 36b increases. Pull-in work can be performed.

  If the opening of the branch pipe joint is formed not to be inclined with respect to the pipe axis of the main pipe 20 but to extend only in the pipe axis direction of the main pipe, the connection string 40 and the existing cable 36b are connected to each other. It has been confirmed by the inventors' verification experiment that they pass through the same position. However, in this embodiment, since the opening 16 is formed so as to extend obliquely with respect to the tube axis of the main pipe 20, when the branch cable 36 (new cable 36 a) is newly drawn, the connection string 40 and the like are The existing cable 36b is pulled upward and axially separated. Therefore, according to this embodiment, the passage string 40 or the like is prevented from entering under the existing cable 36b, and the branch cable 36 can be easily pulled.

  Further, since the branch pipe portion 14 is formed so as to protrude at an acute angle from the saddle portion 12 (main pipe 20), the wiring jig and the new cable 36a are not caught by the branch pipe portion 14, and the wiring jig The insertion operation and the pull-in operation of the branch cable 36 can be easily performed.

  Furthermore, since the branch pipe joint 10 is connected to the oblique upper part of the main pipe 20, the periphery of the main pipe 20 is excavated as compared with the branch pipe joint connected to the substantially right side (substantially pipe shaft height) of the main pipe 20. The width can be reduced and connection work can be easily performed. Further, since the branch pipe portion 14 does not protrude upward from the top of the main pipe 20, the embedding depth of the main pipe 20 can be reduced, and accidents caused by contact with a backhoe excavator or the like in other constructions can be reduced.

  Next, a branch pipe joint 10 which is another embodiment of the present invention will be described with reference to FIGS. The branch pipe joint 10 shown in FIG. 11 is substantially the same as the branch pipe joint 10 shown in FIG. 4 except that a projection 40 is provided on the inner surface of the saddle portion 12. Hereinafter, the branch pipe joint 10 shown in FIG. 11 will be described in detail. The same reference numerals are used for the same parts as the branch pipe joint 10 shown in FIG. 4, and the description thereof is omitted or simplified.

  As shown in FIGS. 11 and 12, the branch pipe joint 10 includes a saddle portion 12 and a branch pipe portion 14. The saddle portion 12 is formed in a substantially rectangular curved plate shape that curves along the outer surface of the main pipe 20 and extends in the pipe axis direction of the main pipe 20. The branch pipe portion 14 is formed on the outer surface of the saddle portion 12, and in a state where the saddle portion 12 is attached to the main pipe 10, the branch pipe portion 14 protrudes at an acute angle with respect to the pipe axis direction of the main pipe 20 and extends in the horizontal direction. It is formed in a straight tube shape. Further, the saddle portion 12 is formed with an opening 16 for communicating the branch hole 38 of the main pipe 20 with the inside of the branch pipe portion 14. The opening 16 has a substantially elliptical shape extending obliquely with respect to the tube axis of the main pipe 20 in a state where the saddle portion 12 is attached to the main pipe 20, and is large enough to fit within the branch hole 38 of the main pipe 20. Have

  Further, the saddle portion 12 is formed with a protruding portion 18 projecting radially from the inner surface thereof. The projecting portion 18 is disposed on the side of the opening 16 opposite to the projecting direction of the branch pipe portion 14, and in a position that fits within the range of the branch hole 38 with the saddle portion 12 attached to the main pipe 20. The protruding portion 18 protrudes from the inner surface of the saddle portion 12 so that the longitudinal section thereof has a substantially trapezoidal shape in this embodiment. The upper surface 18 a of the protrusion 18 has a shape that is curved with substantially the same curvature as the inner surface of the saddle portion 12. The height of the protrusion 18 is set so as to be substantially the same height as the inner surface of the main pipe 20 or slightly protrude (for example, about 1 mm) from the inner face of the main pipe 20.

  As shown in FIG. 13, when the main pipe 20 and the branch pipe 22 are connected using the branch pipe joint 10 shown in FIG. 11, as with the branch pipe joint 10 shown in FIG. Since the line string 40 and the like are separated upward and in the axial direction with respect to the existing cable 36b, the line string 40 and the like can be prevented from entering under the existing cable 36b. That is, since the separation portion 46 is formed between the new cable insertion portion 42 and the existing cable holding portion 44, the passage of the passage string 40 and the like under the existing cable 36b is prevented.

  Further, when the pulling tension is applied, the line string 40 and the like that are pulled up to the tube axis height of the branch pipe 22 by the side edge 16a on the lower side of the opening 16 is the upper surface 18a of the protrusion 18 disposed beside the opening 16. Pass over. At this time, since the position of the line string 40 and the like in the radial direction of the main pipe 20 is limited by the protrusion, contact with the side edge of the branch hole 38 of the main pipe 20 is avoided.

  Here, the branch hole 38 of the main pipe 20 is formed by cutting the main pipe 20 at a construction site. When forming the branch hole 38 of the main pipe 20, it is recommended to chamfer the side edge of the branch hole 38 to be rounded. However, it takes time to chamfer at the construction site, and depending on the operator, the chamfering may not be performed properly, so the side edges of the branch hole 38 may remain rough. For this reason, there is a risk that if the line string 40 or the like hits the side edge of the branch hole 38 when the branch cable 36 is drawn, the line string 40 may be damaged or cut. In the branch pipe joint 10 shown in FIG. 11, such a problem is solved.

  In other words, according to the branch pipe joint 10 shown in FIG. 11, contact between the line string 40 and the side edge of the branch hole 38 of the main pipe 20 can be avoided, so that the branch cable 36 can be pulled in more easily and safely. It can be carried out.

  In each of the above-described embodiments, the branch pipe portion 14 is formed in a straight tube shape. However, the present invention is not limited to this, and the branch pipe portion 14 may be formed in a curved tube shape that bends smoothly. Moreover, although the branch pipe part 14 was formed in the shape of the opening which the diameter of the edge part reduces, it is not limited to this, The branch pipe part 14 can also be formed in the straight hole shape, or It can also be formed in a receiving shape.

  In each of the above-described embodiments, the saddle portion 12 is formed in a substantially rectangular curved plate shape, but is not limited to this. The saddle portion 12 may be curved so as to be along the outer surface of the main pipe 20 and may have a size that substantially covers the branch hole 38 of the main pipe 20. For example, the saddle section 12 may be formed in a semi-cylindrical shape. You can also.

  Further, in each of the above-described embodiments, the lower side edge 16a of the opening 16 is uniformly inclined from the new cable insertion portion 42 to the separation portion 46, but is not limited thereto. For example, the separation portion 46 can be provided with a step, or the inclination of the separation portion 46 can be made larger than the inclination of the new cable insertion portion 42.

  Further, in each of the above-described embodiments, as shown in FIG. 1, the branch pipe joint 10 is attached to the upper right part of the main pipe 20. However, the present invention is not limited to this, and the branch pipe joint 10 is attached to the upper left part of the main pipe 20. Can also be attached. Further, when it is desired to draw the branch cable 36 on both sides of the main pipe 20, the branch pipe joints 10 may be attached on both sides of the upper right side and the left upper side of the main pipe 20. However, the protruding direction of the branch pipe portion 14 is opposite to the pipe axis direction of the main pipe 20 between the case where the main pipe 20 is attached to the diagonally upper right side and the case where the main pipe 20 is attached to the diagonally upper left side. When the branch pipe portion 14 is to be taken out in the opposite direction to the pipe axis direction of the main pipe 20 at the upper right side of the main pipe 20, the branch pipe joint 10 having a symmetrical shape with the branch pipe joint 10 described above is used. Create it.

  The branch pipe joint 10 can also be attached to the main pipe 20 where the separator 28 is not provided. In this case, the height position where the line string 40 and the like pass through the opening 16 of the branch pipe joint 10 is slightly lower, but since it passes through the upper side of the existing cable 36b, there is no change. It is possible to prevent the passage string 40 or the like from entering. Of course, the diameter of the branch pipe portion 14 may be increased so that the opening 16 can be widened.

  Further, in each of the above-described embodiments, the branch hole 38 of the main pipe 20 is formed in a substantially rectangular shape, but is not limited thereto. For example, as shown in FIG. 14, the left and right asymmetric branch holes 38 may be used, and the shape and size may be set such that the projection 18 of the saddle portion 12 can be accommodated only on one side. This prevents the branch pipe joint 10 from being erroneously attached to the left and right.

  Note that the specific numerical values such as the dimensions described above are merely examples, and can be changed as appropriate. The horizontal direction is a concept including not only the horizontal direction in a strict sense but also the substantially horizontal direction.

DESCRIPTION OF SYMBOLS 10 ... Branch pipe joint 12 ... Saddle part 14 ... Branch pipe part 16 ... Opening 16a ... Side edge of opening 18 ... Protrusion part 20 ... Main pipe 22 ... Branch pipe 36 ... Branch cable 36a ... New cable 36b ... Existing cable 38 ... This Pipe branch hole 40 ... Connection string of connection jig

Claims (3)

A branch pipe joint that connects a main pipe of a cable protection pipe that accommodates and protects a cable and a branch pipe,
A saddle portion attached in close contact with the outer surface of the main pipe,
With the saddle part attached to the main pipe, a branch pipe part that protrudes in a horizontal direction from the saddle part and at an acute angle with respect to the pipe axis of the main pipe, and an oblique upper part of the main pipe the branch hole formed with the interior of the branch pipe portion formed on the saddle so as to communicate with, Bei example an opening extending in a direction oblique to the tube axis of the main pipe,
When the new branch cable is drawn into the branch pipe, the line position when the new branch cable passes through the opening of the saddle portion is the upper position at the lower side edge of the opening, and the branch A branch pipe joint in which the passage position of the opening of the saddle portion of the existing branch cable that has been pulled into the pipe moves to the bottom position of the opening . A branch pipe joint that connects a main pipe of a cable protection pipe that accommodates and protects a cable and a branch pipe,
A saddle portion attached in close contact with the outer surface of the main pipe,
With the saddle part attached to the main pipe, a branch pipe part that protrudes in a horizontal direction from the saddle part and in an acute angle with respect to the pipe axis of the main pipe,
An opening formed in the saddle portion so as to communicate with a branch hole formed in an oblique upper portion of the main pipe and the inside of the branch pipe section, and extending in an oblique direction with respect to a pipe axis of the main pipe, and the opening Bei give a separating portion formed on the lower edge of,
The separation portion includes a new cable insertion portion which is a line connection position when the new branch cable passes through the opening of the saddle portion when a new branch cable is drawn into the branch tube, and the branch tube A branch pipe joint that separates the existing branch cable that has been drawn into the existing saddle cable from the existing cable holding part that is the position where the saddle part passes through the opening . Wherein disposed on the opening side of the protruding direction opposite side of the branch pipe portion, further example Bei the collision raised portion projecting from the inner surface of the saddle portion,
The protrusion is formed on the main pipe by passing the new branch cable through the upper surface of the protrusion when the new branch cable is drawn into the branch pipe. The branch pipe joint according to claim 1 or 2 , which prevents contact with a side edge of the branch hole .

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