JP4624068B2 - Pipe joint structure - Google Patents

Description

  The present invention relates to a pipe joint structure.

In general, a seismic tube having a so-called seismic function such as a detachment preventing function and an expansion / contraction function is known. An example of the seismic tube will be described with reference to FIG.
As shown in FIG. 15, a lock ring receiving groove 3 is formed on the inner periphery of the receiving port 2 of one tube 1, and the lock ring 4 divided by 10% in the circumferential direction is formed in the lock ring receiving groove 3. Are arranged in a centered state. On the opening side of the receiving port 2 with respect to the lock ring receiving groove 3, a sealing material pressure contact surface 5 that extends toward the opening is formed, and at the end of the receiving port 2, the flange 2b faces outward in the pipe radial direction. Is formed. In the flange 2b, a plurality of through holes 2c penetrating the flange 2b in the tube axis direction are formed along the circumferential direction.

  Further, an insertion projection 9 is formed on the outer periphery of the other tube 7 on the distal end side of the insertion port 8, and the outer periphery of the insertion port 8 is closer to the opening side of the receiving port 2 than the lock ring 4. From the back side of the mouth 2, a rubber-made annular sealing material 11 and a pusher wheel 13 having the same outer diameter as the flange 2 b in the receiving mouth 2 are arranged.

  The pusher wheel 13 is formed with a through hole 13a penetrating the pusher wheel 13 in the tube axis direction at a position corresponding to the through hole 2c in the receptacle 2. The through hole 2c in the receptacle 2 and the through hole in the pusher wheel 13 are penetrated. A T-head bolt 6 is inserted through the hole 13a so that the head of the hole 13a is engaged with the flange 2b. When the nut 10 is screwed to the inserted T-head bolt 6, the pusher wheel 13 approaches the flange 2 in the receiving port 2 in the tube axis direction, and the sealing material 11 is inserted into the sealing material pressure contact surface 5. It is possible to compress between the outer surface of the mouth 8.

  In such a configuration, when the insertion port 8 is about to come out of the receiving port 2, the insertion projection 9 in the insertion port 8 moves to the position of the lock ring 4 and engages with the lock ring 4. 8 is prevented, and when the expansion / contraction force acts on the joint portion, the insertion projection 9 can be expanded and contracted by moving between the lock ring 4 and the back end surface 14 of the receiving port 2. Yes.

In order to exert such a seismic function, the pipe must be laid in a state where the extending portion L1 and the retracting margin L2 are secured in the joint portion.
On the other hand, as a pipe laying method, in recent years, a pipe-in-pipe method (hereinafter referred to as a PIP method) that can be performed without cutting is often used. This PIP method forms a starting shaft and a reaching shaft from the surface at each position corresponding to one end and the other end of the existing conduit to be updated, and cuts the existing conduit in each shaft Then, a new pipe having a smaller diameter than that of the existing pipe line is inserted from the cut end of the existing pipe line with a hydraulic jack or the like, and the new pipe that follows the new pipe is received. The new pipes are inserted into the existing pipes in the same manner as the first new pipes, and the new pipes are propelled in the existing pipes until the starting vertical shaft reaches the arrival vertical shaft. This is a laying method.

  When laying a seismic pipe by the PIP method, in order to exhibit the seismic function as described above, an extension L1 and a shrinkage margin L2 must be secured at the joint when the pipe is laid.

  As a means for this, for example, as shown in FIG. 16, with the extension L1 and the shrinkage margin L2 secured in the joint, the leading new tube receiving port 2 and the subsequent new tube inserting port 8 are provided. Some use band members 19 that transmit propulsive force between the two.

  The band member 19 includes a main body portion 17 that is tightened to the outer periphery of the insertion opening 8, and a propulsive force transmission portion 16 that is formed from the main body portion 17 toward the receiving side in the tube axis direction and can contact the end surface 2 a of the receiving port 2. And a plurality of rollers 18 projecting outward in the radial direction from the outer surface of the main body portion 17 and contacting the inner surface of the existing pipe line 27.

  By mounting such a band member 19 on the outer periphery of the insertion slot 8 and then inserting the subsequent new pipe into the existing pipe line 27, the propulsive force at this time is supplied to the insertion slot of the subsequent new pipe. 8 can be transmitted from the outer peripheral surface 8 a to the end surface 2 a of the receiving port 2 in the leading new pipe through the band member 19.

If it does in this way, a new pipe can be laid out by propelling the inside of the existing pipe line 27 in the state where the margin L1 and the margin L2 were secured in the joint part. (For example, refer to Patent Document 1.)
JP 2002-309890 A

  Normally, in the case of the pipe joint structure having an earthquake resistance function shown in FIG. 16, since the T-head bolt 6 must be inserted into the pusher wheel 13, the outer diameter of the pusher wheel 13 is substantially the same as the maximum outer diameter of the receiving port 2. It is formed to have dimensions. Further, since the pusher wheel 13 has to contact the sealing member 11 and press the sealing member 11 to the back side of the receiving port 2, the inner diameter of the pusher wheel 13 is slightly larger than the outer diameter of the insertion port 8. It is formed to become.

  Therefore, as shown in FIG. 16, the propulsive force transmitting portion 16 in the band member 19 is formed so as to cross the radially outer side of the pusher wheel 13 in the tube axis direction, and the distal end portion 16 a is an end surface of the receiving port 2. It is formed in an L shape that is bent inward in the radial direction so that the propulsive force at the time of propelling the pipe can be transmitted from the insertion port 8 to the receiving port 2 in contact with 2a. For this reason, the outer diameter of the propulsive force transmitting portion 16 is larger by 2 s than the maximum outer diameter of the receiving port 2 and the outer diameter of the push wheel 13. The roller 18 provided on the main body portion 17 of the band member 19 is provided on the outer surface of the propulsive force transmitting portion 16 or the main body portion 17 in order to reduce the friction between the new pipe and the existing pipe line 27 at the time of propelling the new pipe. Further, it is necessary to protrude, for example, by d outward in the radial direction, and to contact the inner surface of the existing pipe line 27.

  As described above, when the roller 18 protrudes by a dimension (s + d) larger than the outer surface of the receiving port 2 and the outer surface of the push ring 13 by the dimension (s + d), a new pipe laid in the existing pipe line 27 correspondingly. The caliber must be reduced.

  However, in the PIP method, it is desired that the diameter of the new pipe be as large as possible within a range that can be laid in the existing pipe line 27 in order to prevent a reduction in the capacity of the pipe line as much as possible.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such problems and to lay a new pipe having a diameter as large as possible in an existing pipe line in a construction method in which the new pipe is laid while propelling the existing pipe.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the insertion of the other pipe is inserted into the receiving opening of one pipe, and the insertion portion is secured in the joint portion with an extension margin and a contraction margin. An annular push ring is arranged on the outer periphery of the portion of the mouth that does not enter the receptacle, and the push ring and the end of the receptacle are tightened in the tube axis direction by a bolt, whereby the outer surface of the insertion port and the receptacle A seal material disposed between the inner surface of the pipe is compressed by the push ring, and the receiving port and the insertion port in a state where the seal material is compressed are pushed into the existing pipe line to form a new pipe line. A through-hole that penetrates the pusher wheel in the direction of the pipe axis, and the extension port and the shrinkage margin are secured in a state where the extension and contraction margins are secured. A propulsive force transmission member that transmits propulsive force to the insertion slot is mounted on the outer periphery of the insertion slot. The propulsive force transmitting member includes a main body portion that tightens an outer periphery of the insertion port, and an end surface of the receiving port that is formed from the main body unit toward the tube-axis-side receiving side and passes through the through hole of the push ring. have a propulsion force transmitting portion in contact with, has a vertical wall body portion within and tube axis direction pipe diameter direction of the propulsion force transmitting member, the driving force transmitting portion of driving force transmitting member and the wall body After the installation of a new pipe line, when the force to push the insertion port into the receiving port is applied to the joint portion, the wall body is moved away from the receiving port by the propulsive force transmitting portion. The insertion port is allowed to enter the receiving port within a range of a shrinkage margin provided in the joint portion by bending in the direction .

According to such a configuration, the propulsive force transmitting portion in the propulsive force transmitting member can come into contact with the end face of the receiving port through the through hole formed in the press wheel, and the joint portion can be extended and contracted. Can be transmitted between the insertion openings, for example, the propulsive force transmission portion is formed so as to cross the radially outer side of the press wheel in the tube axis direction, and Compared to the case where the tip part is bent inward in the radial direction so that it can come into contact with the end face of the receiving port, the propulsive force transmitting part is prevented from projecting radially outward from the outer periphery of the receiving port. Can do. Thereby, the diameter of the propulsion force transmitting member can be reduced, and the diameter of the new pipe laid by the propulsion method can be increased.
In addition, according to such a configuration, when a force for pushing the insertion port into the receiving port is applied to the joint portion after laying a new pipe line, the wall body in the main body portion is moved by the propulsive force transmitting portion. Since the insertion port enters the receiving port within a range of shrinkage provided in the joint portion by bending in a direction away from the receiving port, an expansion / contraction function can be exhibited in the joint portion.

According to the second aspect of the present invention, the insertion port of the other tube is inserted into the receiving port of the one tube, and the extension portion and the shrinkage margin are secured in the joint portion. An annular push ring is arranged on the outer periphery of the non-existing portion, and the push ring and the end portion of the receiving port are tightened in the tube axis direction by a bolt, thereby being arranged between the outer surface of the insertion port and the inner surface of the receiving port. A pipe for laying a new pipe by propelling the receiving port and the insertion port in a state in which the sealing material is compressed by the push wheel and the sealing material is compressed into the existing pipe. It is a joint structure, and the push wheel is formed with a through-hole penetrating the push wheel in the tube axis direction, and is propelled between the receiving port and the insertion port in a state where the extension and contraction margins are secured. A propulsive force transmitting member for transmitting force is mounted on the outer periphery of the insertion slot, and the propulsive force transmitting portion Is a main body portion that tightens the outer periphery of the insertion port, and a propulsive force transmission unit that is formed from the main body unit toward the tube-axis-side receiving side and passes through the through hole of the push ring and contacts the end surface of the receiving port. The propulsive force transmission part is fixed to the main body part, and after the installation of a new pipe line, when the force to push the insertion port into the receiving part acts on the joint part, the propulsion When the portion where the force transmission part is fixed to the main body part is broken, the fixed state is released, and the insertion port can enter the receiving port in the range of the shrinkage margin provided in the joint part. It is what has been.

According to such a configuration, when the propulsive force transmitting portion is fixed to the main body portion, and a force to push the insertion port into the receiving port is applied to the joint portion after laying a new pipeline, Since the portion where the propulsive force transmitting portion is fixed to the main body portion is broken, the fixed state is released, and the insertion port enters the receiving port within the range of the shrinkage margin provided in the joint portion. The expansion / contraction function can be exhibited in the joint portion.

According to a third aspect of the present invention, in the pipe joint structure according to the first or second aspect , the propulsive force transmitting member contacts the main body at a position farther from the receiving port than the main body on the outer periphery of the insertion port. It has a fastening member having a biting portion that can bite into the outer surface of the insertion port at a possible position, and the fastening member can tighten the outer periphery of the insertion port more strongly than the main body portion by the biting portion. It is possible to transmit a propulsive force between the insertion port and the main body.

  According to such a configuration, for example, when the propulsion distance of the pipe is increased and the propulsive force for propelling the pipe is increased, the gap between the main body portion of the propulsive force transmission member and the outer surface of the insertion opening is increased. Although sliding may occur, the tightening member in the propulsive force transmission member can bite into the outer periphery of the insertion opening and tighten the outer periphery of the insertion opening more strongly than the main body of the propulsion force transmission member. This tightening member transmits a propulsive force between the insertion opening and the main body, and prevents the propulsive force transmission member from sliding with respect to the outer surface of the insertion opening. be able to. Therefore, even when the propulsion distance of the pipe is increased, it is possible to stably secure the expansion and contraction margins at each joint portion.

  As described above, according to the present invention, the propulsive force transmitting portion of the propulsive force transmitting member contacts the end face of the receiving port through the through hole formed in the press wheel, and transmits the propulsive force between the receiving port insertion ports. Can do. Accordingly, the propulsive force transmitting portion can be prevented from projecting radially outward from the outer periphery of the receiving port, and the propulsive force transmitting member can be reduced in diameter, so that the diameter of the pipe laid by the propulsion method can be reduced. It becomes possible to enlarge.

  A pipe joint structure according to an embodiment of the present invention will be described with reference to FIGS. Note that the same components as those described in FIGS. 15 and 16 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the pipe joint structure according to the embodiment of the present invention, as shown in FIG. 1, the insertion port 8 of the other pipe 7 which is also a new pipe is inserted into the receiving port 2 of the one pipe 1 which is a new pipe. An annular push ring 21 is disposed on the outer periphery of the portion of the insertion opening 8 that does not enter the receiving opening 2, and the flange 20 and the pushing ring 21 formed outwardly in the pipe radial direction at the end of the receiving opening 2 are T Propulsive force transmission that is fastened to each other in the direction of the pipe axis by the head bolt 22 and further transmits the propulsive force when propelling the pipe in this state into the existing pipe line 27 and laying it from the insertion port 8 side to the receiving port 2 side. A member 23 is disposed on the outer periphery of the insertion slot 8.

  A lock ring receiving groove 3 is formed on the inner periphery of the receiving port 2, and a portion of the lock ring 4 is disposed in the lock ring receiving groove 3 in a centered state in the circumferential direction. On the opening side of the lock ring housing groove 3, a sealing material pressure contact surface 5 that extends toward the opening is formed, and the flange 20 is formed on the flange 20 formed at the end of the receiving port 2. A plurality of through holes 20a penetrating in the tube axis direction are formed along the circumferential direction.

  Further, an insertion projection 9 is formed on the outer periphery of the other tube 7 on the distal end side of the insertion port 8, and this insertion projection 9 is the lock ring 4 in the receiving port 2 and the back end surface of the receiving port 2. 14, that is, in a state where the extending portion L <b> 1 and the retracting margin L <b> 2 are secured in the joint portion, the insertion port 8 is inserted into the receiving port 2.

  On the outer periphery of the insertion port 8, a seal material 11, a push wheel 21, and a propulsive force transmission member 23 are arranged on the opening side of the receiving port 2 from the insertion port protrusion 9 and from the back side of the receiving port 2. The outer diameter of the press wheel 21 is substantially the same as the outer diameter of the flange 20 in the receiving port 2. Further, as shown in FIGS. 1 and 2, the pusher wheel 21 has a radially inner portion facing the inner side of the receiving port 2 in order to press the sealing material 11 toward the inner side of the receiving port 2. A protruding sealing material pressing portion 21a is formed. The pusher wheel 21 is formed with a through hole 21b having a diameter similar to that of the through hole 20a and penetrating the pusher wheel 21 in the tube axis direction at a position corresponding to the through hole 20a of the flange 20. Further, the pusher wheel 21 penetrates the pusher wheel 21 in the tube axis direction at a position between the through holes 21b adjacent to each other in the circumferential direction and radially inward of the through hole 21b. A plurality of rectangular through-holes 21c larger than 21b are formed along the circumferential direction.

  A T-head bolt 22 is inserted into the through-hole 20a of the flange 20 and the through-hole 21b of the press ring 21 from the flange 20 side in a state where the extending portion L1 and the contracted margin L2 are secured in the joint portion. The nut 15 is screwed together, and the flange 20 and the presser wheel 21 are fastened to each other in the tube axis direction. As a result, the sealing material 11 is compressed between the sealing material pressure contact surface 5 and the outer peripheral surface of the insertion opening 8 by the sealing material pressing portion 21 a in the push wheel 21.

  As shown in FIG. 3, the propulsive force transmission member 23 disposed at a position farther from the receiving port 2 than the pusher wheel 21 on the outer periphery of the insertion port 8 is formed from four divided bodies in the circumferential direction. For the convenience of the position and number of the through holes 21b of the push wheels 21 with respect to the respective divided bodies and the position of the rectangular through holes 21c in the push wheels 21, each of the divided bodies has a longer circumferential length than the others. You may distinguish in one long piece part 23a and the three short piece parts 23b whose circumferential direction length is shorter than this long piece part 23a. In the following, the propulsive force transmission member 23 is composed of one long piece portion 23a having a longer circumferential length than the other and three short piece portions 23b having a shorter circumferential length than the long piece portion 23a. The case where it is done will be described. Further, the main body portion 23 k in the propulsive force transmission member 23 is a portion that is formed in an annular shape by the long piece portion 23 a and the short piece portion 23 b and tightens the outer periphery of the insertion port 8.

  At both ends along the circumferential direction in the long piece portion 23a and the short piece portion 23b, a connecting portion 23c protruding outward in the radial direction and parallel to the tube axis direction, a front side wall body as a wall body perpendicular to the tube axis direction 23d and the rear side wall body 23e are formed. In addition, the wall body formed in the receptacle 2 side of the edge part along the circumferential direction in the long piece part 23a and the short piece part 23b is the front side wall body 23d, and the wall body formed in the other side is a back side wall body. 23e.

  A circular hole 23f that penetrates the connecting portion 23c in the thickness direction is formed in the connecting portion 23c at both ends along the circumferential direction in the long piece portion 23a and the short piece portion 23b. A through-hole 23g that penetrates the connecting portion 23c in the thickness direction is formed at a position on the radially inner side. As shown in FIGS. 1 and 3, the through-hole 21 c in a state where a sufficient gap is maintained between the front side wall 23 d of the long piece portion 23 a and the short piece portion 23 b with the through-hole 21 c of the push wheel 21. A plate-like propulsive force transmitting portion 23h that is inserted through the contact hole 2 and contacts the end surface 2a of the receiving port 2 is formed toward the tube-axis-side receiving side. Note that the above-mentioned sufficient gap means that, for example, even when the joint portion of the jointed receiving port 2 and the insertion port 8 is bent at an angle within an allowable range, the propulsive force transmitting portion 23h is connected to the through hole 21c. It is a grade which does not contact a peripheral part.

  In order to connect the long piece portion 23a and the short piece portion 23b and the short piece portion 23b and the short piece portion 23b in the circumferential direction to form the annular propulsive force transmitting member 23, the long piece portion 23a and the short piece portion 23b are inserted into the insertion port 8. A bolt 24 is inserted into the through hole 23g in each of the long piece portion 23a and the short piece portion 23b, and the short piece portion 23b and the short piece portion 23b, and a nut 25 is screwed to the bolt 24. When the nut 25 is screwed onto the bolt 24, when the propulsive force transmitting member 23 transmits propulsive force to the short surface 2 a of the receiving port 2, the main body portion 23 k of the propulsive force transmitting member 23 is against the outer periphery of the insertion port 8. In order to prevent slipping, the nut 25 is fastened to the bolt 24 with a predetermined torque. Here, the predetermined torque is, for example, a magnitude that prevents the main body portion 23k of the propulsive force transmission member 23 from slipping with respect to the outer periphery of the insertion slot 8 when transmitting the propulsive force. The tightening force of the propulsive force transmission member 23 with respect to the outer periphery of the mouth 8 is large enough not to be excessive.

  At this time, the propulsive force transmitting portion 23 h is inserted into the through hole 21 c in the push wheel 21, and the tip end portion of the propelling force transmitting portion 23 h is brought into contact with the end surface 2 a of the receiving port 2. Further, a roller 26 having a rotation shaft 26a is disposed between the connecting portions 23c of the adjacent long piece portions 23a and the short piece portions 23b and between the connecting portions 23c of the adjacent short piece portions 23b. It fits in the round hole 23f of each connection part 23c.

  In this way, the long piece portion 23a, the short piece portion 23b, and the short piece portion 23b are connected to each other in the circumferential direction to constitute the annular propulsive force transmission member 23. As shown in FIG. 1, in the propulsive force transmission member 23, a part of the roller 26 protrudes outward in the radial direction by, for example, the dimension d from the connecting portion 23c, and as a result, as shown in FIG. The four rollers 26 in the propulsive force transmission member 23 can simultaneously contact the inner surface of the existing pipe line 27. Further, when the propulsive force transmitting member 23 is mounted on the outer periphery of the insertion opening 8, as shown in FIG. 4, the long piece portion 23a is positioned on the tube top side. By doing in this way, the low pipes 26 in the propulsive force transmission member 23 are arranged so as to be biased toward the tube bottom side of the insertion port 8 as compared with the tube top side, and the new pipe is arranged with respect to the existing pipe line 27. It can be supported stably.

  In such a configuration, in order to lay a new pipe in the existing pipe line 27 by the PIP method, a start shaft and a reaching shaft are formed in the same procedure as the PIP method described above, and the existing shaft is installed in each shaft. The pipe 27 is cut, and a new pipe having a smaller diameter than that of the existing pipe 27 is inserted from the cut end of the existing shaft 27 in the existing management 27 with a hydraulic jack or the like from the inlet 8 side. A subsequent new tube insertion port 8 is inserted into the receiving port 2 and connected.

  At this time, the propulsive force transmitting member 23 is mounted in advance at a predetermined position on the outer periphery of the insertion port 8 of the subsequent new pipe, and the propulsive force transmitting portion 23 h of the propulsive force transmitting member 23 is the short surface 2 a of the receiving port 2. At the position in contact with the pipe, an extension L1 and a contraction margin L2 are applied to the joint portion of the pipe. In addition, the through-hole 21c in the push wheel 21 is not formed at a position corresponding to the propulsive force transmitting portion 23h in the propulsive force transmitting member 23, but is formed at a plurality of locations spaced at predetermined intervals along the circumferential direction. The propulsive force transmitting portion 23h can be inserted into the through hole 21c at an arbitrary location and easily brought into contact with the end surface 2a of the receiving port 2. Thereby, work can be easily performed without extra positioning, and the efficiency of construction work can be improved.

  Then, as shown in FIG. 1, the subsequent new pipe is inserted into the existing pipe line 27 in a state where the tip end portion of the propulsive force transmitting portion 23 h is in contact with the end surface 2 a of the receiving port 2. At this time, the propulsive force transmitting portion 23h of the propulsive force transmitting member 23 is inserted into the through hole 21c formed in the push wheel 21 and is in contact with the end surface 2a of the receiving port 2, for example, as shown in FIG. As in the case of the case, the propulsive force transmitting portion 16 in the band member 19 is formed so as to cross the radially outer side of the push wheel 13 in the tube axis direction, and the tip end portion 16a contacts the end face 2a of the receiving port 2 Thus, it is not necessary to form an L-shape that bends radially inward. That is, it is possible to prevent the outer diameter of the propulsive force transmitting portion 23 h from becoming larger than the maximum outer diameter of the receiving port 2 and the outer diameter of the push wheel 13.

  Accordingly, in the propulsion force preventing member 23, the dimension that protrudes radially outward from the outer diameter of the flange 20 or the push wheel 21 of the receiving port 2 is only the dimension d that is a part of the roller 26. For example, FIG. The projecting dimension can be narrowed by s, as compared with the case shown in FIG. 2, and thereby the diameter of the new pipe that can be laid in the existing pipe line 27 can be increased.

  And the propulsive force which acts from the insertion port 8 side is transmitted from the outer surface 8a of the insertion port 8 to the end surface 2a of the receiving port 2 via the propulsive force transmission member 23. The new pipe can be laid in the existing pipe line 27 in a state where the margin L1 and the margin L2 are secured in the joint portion.

  Thereafter, a further subsequent new pipe insertion port 8 having a driving force transmission member 23 mounted on the outer periphery thereof is connected to the subsequent new pipe receiving port 2, and this further subsequent new pipe is connected to the existing pipe line with a hydraulic jack or the like. 27 is inserted. By repeating this work, the new pipe is propelled in the existing pipeline 27, and the new pipe is laid from the starting vertical shaft to the reaching vertical shaft.

  As shown in FIG. 5, when a force is applied to the joint portion of the new pipe laid in the existing pipe line 27 as described above to cause the insertion port 8 to escape from the receiving port 2 due to, for example, an earthquake, as shown in FIG. 5. The insertion port 8 is pulled out from the receiving port 2 along the inner surface of the existing pipe line 27 by the roller 26 of the propulsive force transmission member 23, and the propulsive force transmission unit 23 h is also pulled out from the through hole 21 c in the pusher wheel 21. The mouth projection 9 moves to the position of the lock ring 4. Then, the insertion port 8 is prevented from being detached by the insertion port protrusion 9 engaging the lock ring 4 from the back side of the receiving port 2.

  Further, when a force larger than the propulsive force is applied to the joint portion to push the insertion port 8 into the receiving port 2 due to an earthquake, the insertion port 8 is inserted into the receiving port 2 as shown in FIG. As it enters, a slip occurs between the outer surface 8a of the insertion port 8 and the inner surface of the main body portion 23k, and the insertion port 8 is received until the tip of the insertion port 8 contacts the back end surface 14 of the reception port 2. Can enter into mouth 2. As described above, since the insertion projection 9 can move between the lock ring 4 and the back end surface 14 of the receiving port 2, an earthquake resistance function is imparted to the joint.

  In the above description, when the main body 23k of the propulsive force transmission member 23 is tightened against the outer periphery of the insertion slot 8, the nut 25 is tightened to the bolt 24 with a predetermined torque, and the main body of the propulsive force transmission member 23 is propelled. Although the portion 23k does not slide with respect to the outer periphery of the insertion slot 8, for example, the tightening torque is further increased so that the main body 23k of the propulsive force transmission member 23 does not slide with respect to the outer periphery of the insertion slot 8. You may do it.

  In this case, as shown in FIG. 7, when a force larger than the propulsive force is applied to the joint portion so as to push the insertion port 8 into the receiving port 2, the front side wall body in the propulsive force transmission member 23. 23d is bent in a direction away from the receiving port 2 by the propulsive force transmitting portion 23h. Thereby, a joint part can shrink in a pipe-axis direction, and the insertion port 8 can enter into the receiving port 2 until the front-end | tip part contacts the back end surface 14 of the receiving port 2. FIG.

Thus, even if the main body portion 23k of the propulsive force transmitting member 23 does not slip with respect to the outer periphery of the insertion port 8, an earthquake resistance function can be imparted to the joint portion between the receiving port 2 and the insertion port 8. .
Moreover, in the above, when the force which pushes the insertion port 8 into the receiving port 2 acts on a joint part, when a front side wall body 23d in the thrust transmission member 23 bends, a joint part will shrink | contract However, the present invention is not limited to this. For example, as shown in FIG. 8, a through hole 23i that penetrates the front side wall 23d in the tube axis direction at a position corresponding to the propulsive force transmitting portion 23h in the front side wall 23d. The propulsive force transmitting portion 23h is inserted through the through hole 23i, and the portion of the propulsive force transmitting portion 23h that has passed through the front side wall body 23d is connected to the base portion 23j formed at the base portion of the front side wall body 23d. It is good also as a structure fixed with the bolt 29 or the like. Hereinafter, a case where the bolt 29 is used will be described.

  According to such a configuration, when a force for the insertion port 8 to come out from the receiving port 2 is applied to the joint portion of the new pipe laid in the existing pipe line 27, the illustration is omitted, but the insertion port 8 is omitted. The insertion slot 9 is moved to the position of the lock ring 4. Then, the insertion port 8 is prevented from being detached by the insertion port protrusion 9 engaging the lock ring 4 from the back side of the receiving port 2.

  Further, when a force larger than the propulsive force is applied to the joint portion to push the insertion port 8 into the receiving port 2, as shown in FIG. 9, the outer surface of the insertion port 8 and the body portion 23k Therefore, the bolt 29 fixing the propulsive force transmitting portion 23h to the base portion 23j is sheared, and the propulsive force transmitting portion 23h passes through the through hole 23i, so that the insertion port 8 is , And can enter into the receiving port 2 until the tip thereof contacts the back end surface 14 of the receiving port 2.

  In the case of the PIP method using the propulsive force transmission member 23 as described above, if the distance for propelling the new pipe in the existing pipe line 27 becomes very long, the propulsive force is applied to the outer periphery of the insertion port 8 with a predetermined tightening force. Even if the transmission member 23 is tightened, a slip may occur between the outer periphery of the insertion slot 8 and the inner surface of the main body 23k. In order to prevent such a situation, for example, as shown in FIG. 10, the fastening member 28 in the propulsive force transmission member 23 is inserted in a state in which the extension L1 and the contraction margin L2 are secured in the joint portion. It arrange | positions in the state made to contact the back side wall body 23e on the outer periphery of 8. FIG.

  As shown in FIG. 10, the fastening member 28 includes an annular base portion 28a disposed on the outer periphery of the insertion slot 8, and a plurality of arc-shaped portions formed on the inner side of the base portion 28a along the circumferential direction. A nail chamber 28b, an arc-shaped nail body 28d that is disposed in the nail chamber 28b and has a biting portion 28c on the side away from the receiving port 2 in the radially inner portion, and a radial direction from the nail chamber 28b There is a push bolt 28f that is screwed into the screw hole 28e formed outward and presses the claw body 28d from the radially outer side toward the inner side.

  When the tightening member 28 having such a configuration is disposed on the outer periphery of the insertion slot 8 and the new pipe propulsion method is performed, the tightening member is caused by the reaction of the propulsive force as shown in FIG. A force in a direction away from the receiving port 2 acts on 28. At this time, the claw body 28d is pressed against the outer surface 8a of the insertion port 8 by the push bolt 28f, so that the claw body 28d is inclined in the nail chamber 28b as shown in FIG. It is possible to cause 28c to bite deeper into the outer surface 8a of the insertion slot 8. Thereby, this push ring 28 can be prevented from slipping with respect to the outer surface 8a of the insertion slot 8.

  Accordingly, when the fastening member 28 having the above-described configuration is disposed on the outer periphery of the insertion opening 8 as shown in FIG. Even when the propulsion distance is increased and slipping occurs between the outer surface 8a of the insertion slot 8 and the inner surface of the main body 23k, the fastening member 28 disposed on the outer surface 8a of the insertion slot 8 prevents this slippage. The propulsive force when laying a new pipe can be transmitted from the outer surface 8a of the insertion port 8 to the end surface 2a of the receiving port 2 through the tightening member 28, the body portion 23k, and the propulsive force transmitting portion 23h. Can do. As a result, even if the propulsion distance of the new pipe becomes long, the new pipe is propelled in the existing pipe line 27 with the extension L1 and the contraction margin L2 secured in the joint portion between the receiving port 2 and the insertion port 8. Can be laid.

  When a force is applied to the new pipe joint laid in the existing pipe line 27 as described above to cause the insertion port 8 to come out of the receiving port 2, illustration is omitted, but the insertion port 8 is propelled. While the roller 26 of the force transmission member 23 is pulled out from the receiving port 2 along the inner surface of the existing pipe line 27, the propulsive force transmitting unit 23h is also pulled out from the through hole 21c in the pusher wheel 21, and the insertion projection 9 in the insertion port 8 is locked. Move to the position of the ring 4. Then, the insertion port 8 is prevented from being detached by the insertion port protrusion 9 engaging the lock ring 4 from the back side of the receiving port 2.

  Moreover, it tries to push the insertion port 8 into the receiving port 2 in the joint part. When a force larger than the propulsive force is applied, as shown in FIG. 12, the tightening member 28 prevents slippage between the outer surface 8a of the insertion port 8 and the inner surface of the main body 23k. The front side wall body 23d is bent in a direction away from the receiving port 2 by the propulsive force transmitting portion 23h. Thereby, the insertion port 8 can enter the receiving port 2 until the distal end thereof contacts the back end surface 14 of the receiving port 2.

Thus, even if the tightening member 28 is disposed on the outer periphery of the insertion slot 8, it is possible to impart an earthquake resistance function to the joint portion between the receiving slot 2 and the insertion slot 8.
In the above, when a force is applied to the joint portion where the fastening member 28 is attached to the outer periphery of the insertion port 8 to push the insertion port 8 into the receiving port 2, as shown in FIG. Although the case where the joint portion is contracted in the pipe axis direction by bending the front side wall body 23d of the propulsive force transmission member 23 has been described, the present invention is not limited to this, for example, as shown in FIG. 13, the joint portion shown in FIG. The tightening member 28 may be disposed at a position where the propulsive force transmitting member 23 contacts the publicity side wall body 23e.

  According to such a configuration, when a force larger than the propulsive force acting on the joint portion to push the insertion port 8 into the receiving port 2 is applied, as shown in FIG. Since slippage between the outer surface 8a of the insertion port 8 and the main body portion 23k is prevented, the bolt 29 fixing the propulsive force transmitting portion 23h to the base portion 23j shears, thereby causing the propulsive force. The insertion portion 8 can enter the receiving port 2 until the distal end thereof contacts the back end surface 14 of the receiving port 2 by the transmission portion 23h passing through the through hole 23i.

  As described above, according to the present invention, the propulsive force transmitting portion 23h of the propulsive force transmitting member 23 contacts the end surface 2a of the receiving port 2 through the rectangular through hole 21c formed in the pusher wheel 21, and receives the receiving force. Propulsive force can be transmitted between mouth insertions. Therefore, it is possible to prevent the propulsive force transmitting portion 23h from protruding outward in the radial direction from the outer periphery of the receiving port 2, and the propulsive force transmitting member 23 can be reduced in diameter. It is possible to increase the diameter of the tube.

It is a figure which shows the joint structure of the pipe | tube of embodiment of this invention. It is a front view of the push ring shown in FIG. It is a front view in the state where the propulsive force transmission member shown in FIG. 1 was disassembled. It is a front view which shows the use condition of a thrust transmission member. It is a figure which shows the state which the withdrawal force acted on the pipe joint shown in FIG. It is a figure which shows the state in which pushing force acted on the pipe joint shown in FIG. It is a figure which shows the state which the front side wall body bent when pushing force acted in the pipe joint shown in FIG. It is a figure which shows the joint structure of the pipe different from the joint structure of the pipe shown in FIG. It is a figure which shows the state in which pushing force acted on the pipe joint shown in FIG. It is a figure which shows a fastening member. It is a figure which shows the state by which the fastening member shown in FIG. 10 was mounted | worn with the pipe joint shown in FIG. It is a figure which shows the state in which pushing force acted on the pipe joint shown in FIG. It is a figure which shows the state by which the clamping member shown in FIG. 10 was mounted | worn with the pipe joint shown in FIG. It is a figure which shows the state in which pushing force acted on the pipe joint shown in FIG. It is a figure which shows an example of the joint structure of the pipe | tube provided with the earthquake resistance function. It is a figure which shows the state which installs this earthquake-resistant pipe | tube by the PIP construction method in the state which ensured the expansion | extension margin and the shrinkage margin in the joint part of the earthquake-resistance pipe | tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 One pipe 2 Receiving port 2a End surface 7 The other pipe 8 Insertion 8a Outer surface 11 Seal material 21 Push ring 21c Through-hole 22 T head bolt 23 Propulsive force transmission member 23h Propulsive force transmission part 23k Main part L1 Extend and shrink L2

Claims (3)

An annular push ring on the outer periphery of the portion of the insertion port that does not enter the receiving port, with the insertion port of the other tube being inserted into the receiving port of the one tube and having a margin for expansion and contraction secured in the joint. And the seal member disposed between the outer surface of the insertion port and the inner surface of the receiving port is formed by tightening the pressing wheel and the end portion of the receiving port in the tube axis direction with a bolt. A joint structure for a pipe for laying a new pipe line by propelling the receiving port and the insertion port in a state compressed by the seal material into an existing pipe line,
A propulsion force that transmits a propulsion force between the receiving port and the insertion port in a state where a through-hole penetrating the pusher wheel in the tube axis direction is formed in the pusher wheel and the extension and contraction margins are secured. A transmission member is mounted on the outer periphery of the insertion port, and the propulsive force transmission member is formed from the main body unit toward the tube-axis direction receiving side from the main body unit and tightens the outer periphery of the insertion port. by inserting the hole have a propulsion force transmitting portion contacting the end face of the socket,
The main body portion of the propulsive force transmission member has a wall body that is perpendicular to the tube radial direction and the tube axis direction, and the propulsive force transmission portion of the propulsive force transmission member is in contact with the wall body, and after the new pipe is laid When the force to push the insertion port into the receiving part acts on the joint part, the wall body is bent in the direction away from the receiving port by the propulsive force transmitting part, and is provided at the joint part. A joint structure for a pipe, characterized in that the insertion port can enter the receiving port within a range of shrinkage . An annular push ring on the outer periphery of the portion of the insertion port that does not enter the receiving port, with the insertion port of the other tube being inserted into the receiving port of the one tube and having a margin for expansion and contraction secured in the joint. And the seal member disposed between the outer surface of the insertion port and the inner surface of the receiving port is formed by tightening the pressing wheel and the end portion of the receiving port in the tube axis direction with a bolt. A joint structure for a pipe for laying a new pipe line by propelling the receiving port and the insertion port in a state compressed by the seal material into an existing pipe line,
A propulsion force that transmits a propulsion force between the receiving port and the insertion port in a state where a through-hole penetrating the pusher wheel in the tube axis direction is formed in the pusher wheel and the extension and contraction margins are secured. A transmission member is mounted on the outer periphery of the insertion port, and the propulsive force transmission member is formed from the main body unit toward the tube-axis direction receiving side from the main body unit and tightens the outer periphery of the insertion port. A propulsive force transmitting portion that is inserted through the hole and contacts the end face of the receiving port;
The propulsive force transmission part is fixed to the main body part, and after the installation of a new pipe line, when the force to push the insertion port into the receiving part acts on the joint part, the propulsive force transmission part is The fixed state is released by breaking the portion fixed to the part, and the insertion port is allowed to enter the receiving port in the range of the shrinkage margin provided in the joint part. joint structure characterized tube. A tightening member having a biting portion that can bite into the outer surface of the insertion port at a position where the propulsive force transmission member is farther from the receiving port than the main body unit on the outer periphery of the insertion port and can be in contact with the main body unit The tightening member is capable of tightening the outer periphery of the insertion opening more strongly than the main body portion by the biting portion, and provides a propulsive force between the insertion opening and the main body portion. joint structure according to claim 1 or 2, wherein the tube, characterized in that it is possible to transmit.

Images