JP6474652B2 - Inner surface joint, joining auxiliary tool and joining method - Google Patents

Description

  The present invention relates to an inner joint of a receiving port and an insertion port in a pipe such as a water supply, an auxiliary tool used for the joining, and a joining method using the auxiliary tool.

  Among ductile cast iron pipes constituting pipes such as water pipes, when joining pipes with a nominal diameter of about 800 mm or more, an inner surface joint joint is employed in which an operator enters the pipe and performs the joining work (see Patent Document 1 below) ), U type and US type are defined as such an internally bonded joint.

  As an example, the construction procedure of the US-type inner joint is explained based on FIG. In this inner surface joint joint, first, as shown in FIG. 12A, the insertion port 2 is inserted into the receiving port 1. On the inner peripheral surface of the receiving port 1 are formed a tapered surface 3 that gradually increases in diameter from the opening side to the back side, and a step surface 4 that is located on the back side and whose inner diameter changes from a large diameter to a small diameter. ing.

And the press mechanism for compressing the sealing material 5 while inserting the sealing material 5 using a rubber ring between the inner peripheral surface of the receiving port 1 and the outer peripheral surface of the insertion port 2 by the operation | work in a pipe | tube. As P ₂ , the split wheel 51 and the push wheel 52 are fitted between the sealing material 5 and the step surface 4. The split wheel 51 and the push wheel 52 are divided into a plurality in the circumferential direction, and the divided portions are joined at the time of construction.

  Prior to this, the pusher wheel 52 is in a state where the push bolt 53 is screwed into the screw hole extending in the tube axis direction from the surface facing the step surface 4. The push bolt 53 has a recess 54 in the head, and a plurality of push bolts 53 are arranged in the circumferential direction.

  Next, of all the push bolts 53, about one in three, as shown in FIG. 12 (b), unscrewing into the screw hole of the pusher wheel 52 to increase the protruding amount of the screw. And the pusher wheel 52 and the split wheel 51 are moved so as to press against the sealing material 5.

  Accordingly, the gap between the head of the other push bolt 53 and the step surface 4 is enlarged, so that these push bolts 53 are connected to the recess 54 of the head and the step surface as shown in FIG. 4, with the joint rod 56 interposed therebetween, the screw is rotated in the screwing direction, the pusher wheel 52 and the split wheel 51 are moved in the direction of the tapered surface 3, and the sealing material 5 is strongly strengthened in the tube axis direction. Compress.

  Then, the push bolt 53 previously screwed is once screwed into the push wheel 52, and the joint rod 56 is inserted in the same manner as described above, and then rotated again in the screwing direction. To be evenly compressed.

  By such an operation, the sealing material 5 comes into close contact with the tapered surface 3 of the receiving port 1 and the outer peripheral surface of the insertion port 2, and the water between the receiving port 1 and the insertion port 2 is stopped.

  Further, in this inner surface joint, a protrusion 6 is formed on the opening end side from the tapered surface 3 of the inner peripheral surface of the receiving port 1, and further, the insertion port 2 is prevented from coming off from the receiving port 1. A protrusion 7 is formed on the outer peripheral surface, and a lock ring 8 is fitted into an annular groove on the inner peripheral surface of the receiving port 1, and the lock ring 8 is locked by a set bolt 9.

Japanese Utility Model Publication No. 63-9828

  However, since the gap between the head of the push bolt 53 and the stepped surface 4 of the receiving port 1 is narrow in the inner joint as described above, an electric impact wrench or a ratchet wrench is used when the push bolt 53 is rotated. There is a problem that it is very inefficient because it is necessary to rotate the wrench little by little while frequently changing the spanner.

  Further, the split wheel 51 and the push wheel 52 have a total weight of 50 kg or more even with a nominal diameter of 800 mm, and there is a problem that the handling load is large in a narrow pipe.

  Therefore, an object of the present invention is to improve the efficiency of joining work in an inner joint and reduce the work load.

  In order to solve the problems as described above, the present invention provides a stepped surface in which the inner diameter changes from a large diameter to a small diameter on the inner periphery of the receiving port in order to ensure the sealing performance of the pipe joint in which the inserting port is inserted into the receiving port. An annular sealing material having elasticity is interposed between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port, and a pressing mechanism is inserted between the sealing material and the step surface. Along with the extension in the axial direction, the sealing material is pressed to the opposite side of the step surface and compressed in the tube axis direction so as to be in close contact with the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port The pressing mechanism is a combination of a press ring base and a plurality of press members arranged in the circumferential direction thereof, and these are stacked on the front and back to be slidable in the tube axis direction. The racks are opposed to each other and biased in the pressing direction by a spring. One end of the base comes into contact with the stepped surface of the receiving port, the push member is pushed out from the other end of the push wheel base in the tube axis direction, and the push member is pressed by the rack portion while the tip of the push member presses the sealing material. The detent is stopped, and the compressed state of the seal material in the tube axis direction is maintained.

  The auxiliary tool used for joining the inner surface joint is composed of a fixed member and a moving member, and a tool bolt inserted from the fixed member to the moving member. The fixed member and the moving member are tool bolts. The leg portion that engages with the presser wheel base and the pressing member is extended from the portion through which the tool is inserted, and the tool bolt is rotatable with respect to the fixed member and screwed into the moving member. When the head of the tool bolt is turned, the moving member moves in the axial direction of the tool bolt.

  In order to perform such an inner joint joint operation in the pipe using the auxiliary tool, the sealing material is inserted into the receiving port with the inner peripheral surface of the receiving port and the outer periphery of the inserting port. Next, the pressing mechanism is inserted between the sealing material and the inner peripheral step surface of the receiving port, the one end of the push wheel base comes into contact with the step surface, and the tip of the pressing member is sealed. Next, the leg portion of the fixing member of the auxiliary tool is engaged with the presser wheel base, the leg portion of the moving member is engaged with the pressing member, and the head of the tool bolt is fitted. Turn the rotating tool to move the moving member away from the fixed member, periodically disengage the rack against the spring bias, and push the pushing member from the other end of the pusher wheel base toward the tube axis. By pushing the sealing material to the specified amount with the pressing member, compress it in the tube axis direction, Brought into close contact with the inner circumferential surface and inserted port outer peripheral surface of the rack portion and the junk ring base and the pressing member is fixed in a state in mesh.

  In the inner surface joint according to the present invention, by using an auxiliary tool, the push member is moved in the pushing direction with respect to the push wheel base using a rotary tool such as an electric impact wrench or a ratchet wrench, and the seal material is compressed. Therefore, it is not necessary to turn the push bolt while frequently changing the spanner, and the joining work can be performed efficiently. In addition, the split wheel is not required, and the weight of the pressing mechanism handled in the pipe is reduced. This also reduces the work load and improves the work efficiency.

The perspective view which shows the (a) front side of the push ring base of the press mechanism used for the inner surface joining joint which concerns on embodiment of this invention, (b) The perspective view which shows a back side (A) The perspective view which shows the front side of a pushing member same as the above, (b) The perspective view which shows a back side The perspective view which shows the assembly process of a press mechanism same as the above. (A) Notched perspective view showing the insertion state of the sealing material same as above, (b) Pipe axis direction sectional view (A) Notched perspective view and (b) Pipe axis direction sectional view showing the fitted state of the pressing mechanism same as above. (A) The perspective view which shows the state which the fixed member and the moving member approached of the auxiliary tool used for a joining operation same as the above, (b) The perspective view which shows the state which the moving member left | separated from the fixed member (A) The perspective view which shows the state before extrusion of the pushing member of the press mechanism by an auxiliary tool same as the above, (b) The perspective view which shows the state after extrusion Notched perspective view showing the state during extrusion work with a rotating tool in the pipe (A) Expanded sectional view in the tube axis direction showing the state before extrusion of the pushing member same as above, (b) Expanded sectional view in the tube axis direction showing the state during extrusion. Notched perspective view showing the completion of construction Same as above (A) Initial state at the time of insertion of the pressing mechanism, (b) Temporary unscrewing state of some push bolts, and (c) Unscrewing state with the joint rod inserted, in the construction procedure of the conventional US type inner joint. Each tube axis direction sectional view shown

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 10 and 11, when this construction is completed, the inner surface joint is a mechanism for compressing the sealing material 5 that stops water between the receiving port 1 and the insertion port 2 in the tube axis direction. in place of the conventional pressing mechanism P ₂ shown in FIG. 12, the pressing mechanism P ₁ is employed. The pressing mechanism P ₁ includes a pressing ring base 11 that is more split in the circumferential direction, and a plurality of press members 12 that are arranged in the circumferential direction.

  As shown in FIG. 1, the push wheel base 11 is formed by arranging a plurality of base portions 14 at intervals in the circumferential direction on a curved band portion 13. A rack portion 15 in which teeth are arranged in a sawtooth shape in the tube axis direction is formed on the surface of the base portion 14, and elongated holes 16 extending in the tube axis direction are formed on both sides thereof. A groove 17 is formed along the long hole 16 on the back surface side of the base portion 14.

  The push member 12 has a front end portion projecting from both sides, an engagement protrusion 18 projecting from the both sides to the rear portion, and two through holes 19 extending from the front and back to the rear end. Further, a rack portion 20 in which teeth are arranged in a sawtooth shape in the tube axis direction is formed on the back surface of the pressing member 12.

To assemble the pressing mechanism P ₁ from the junk rings base 11 and the pressing member 12. As shown in FIG. 3, stacked member 12 pressed to the front side of the base portion 14 of the pressing ring base 11, the rack portion 15, 20 with each other Make them face each other. Then, the spring 22 is fitted into the screw shaft portion of the locking bolt 21, the screw shaft portion is inserted into the long hole 16 and the through hole 19, and can be slid along the long hole 16. Loosely tighten the screw shaft of the locking bolt 21 to such an extent that it moves.

  The spring 22 fitted to the locking bolt 21 is a compression coil spring, and is sandwiched between the base portion 14 of the presser wheel base 11 and the head of the locking bolt 21 to press the presser wheel base 11 and the pressing member 12 in the pressing direction. Is energized. The head of the locking bolt 21 has a square shape, the head engages with the groove 17, and the locking bolt 21 is prevented from rotating with respect to the pusher wheel base 11.

In order to perform the joining operation of the inner joint joint in the pipe using such a pressing mechanism P ₁ , first, as shown in FIG. 4, the sealing material 5 is inserted with the insertion port 2 inserted into the receiving port 1. It is inserted between the tapered surface 3 on the inner periphery of the receiving port 1 and the outer peripheral surface of the insertion port 2.

Next, as shown in FIG. 5, the pressing mechanism P ₁ is configured such that one end of the push wheel base 11 abuts on the step surface 4 between the seal member 5 and the step surface 4, and the tip of the push member 12 is the seal member. Fit it in the direction of 5. The presser wheel bases 11 are connected to each other by a fastener 10.

  In this joining operation, an auxiliary tool A as shown in FIG. 6 is used. The auxiliary tool A includes a fixed member 31 and a moving member 32, and a tool bolt 33 that is inserted from the fixed member 31 to the moving member 32. The fixed member 31 and the moving member 32 are inserted with the tool bolt 33. The leg portion extends from both ends of the horizontal beam. The tool bolt 33 is rotatable with respect to the fixed member 31 and is screwed into the moving member 32. When the head of the tool bolt 33 is turned, the moving member 32 moves in the axial direction of the tool bolt 33. It has become.

As shown in FIGS. 7 and 9A, such an auxiliary tool A is inserted and engaged with the leg portion of the fixing member 31 into the end portion of the elongated hole 16 located on one end side of the pusher wheel base 11. , it is engaged with the engaging projections 18 of the pressing leg portion of the moving member 32 member 12, and sets the pressing mechanism P _1. In this state, the push wheel base 11 and the push member 12 are brought into close contact with each other by the urging force of the spring 22 and the rack portions 15 and 20 are engaged with each other, so that the push member 12 is fixed.

  Then, as shown in FIGS. 8 and 9B, the head of the tool bolt 33 is turned with a rotary tool W such as an electric impact wrench or a ratchet wrench so that the moving member 32 moves away from the fixed member 31. The rack portions 15 and 20 are disengaged against the bias of the spring 22, the peaks of the rack portions 15 and 20 cross each other along the taper, and the meshing positions of the rack portions 15 and 20 are shifted. The pushing member 12 is pushed out from the other end of the pusher wheel base 11 in the tube axis direction.

  In this extrusion process, when the peaks of the rack portions 15 and 20 get over each other as the push member 12 moves, the rack portions 15 and 20 are engaged again, and the reverse movement of the push member 12 is prevented.

  As the pushing member 12 is pushed out, the sealing material 5 is pushed by the tip of the pushing member 12 and pushed into the small diameter side of the tapered surface 3 of the receiving port 1 to a specified amount (specified by the Ductile Iron Pipe Association). The auxiliary tool A is removed in a state in which the rack portions 15 and 20 are engaged with each other by compressing in the direction so as to be in close contact with the tapered surface 3 of the receiving port 1 and the outer peripheral surface of the insertion port 2.

  Then, after all the pressing members 12 are uniformly pushed to the specified amount by the same operation, as shown in FIGS. 10 and 11, the nut 23 is tightened to the locking bolt 21, and the pusher wheel base 11, the pushing member 12, When is fixed, the construction is completed.

  In the inner joint as described above, by using the auxiliary tool A, the push member 12 is moved in the pushing direction with respect to the pusher wheel base 11 using a rotary tool W such as an electric impact wrench or a ratchet wrench, and a sealing material. Since 5 can be compressed, it is not necessary to turn the push bolt while frequently changing the spanner, and the joining work can be performed efficiently.

Further, the split ring as in the prior art becomes unnecessary, the weight of the pressing mechanism P ₁ handled within the tube is lighter as compared with the case where it took the conventional split ring and junk ring, which also, workload It is reduced and work efficiency improves.

DESCRIPTION OF SYMBOLS 1 Receiving port 2 Inserting port 3 Tapered surface 4 Step surface 5 Sealing material 6, 7 Protrusion part 8 Lock ring 10 Fastener 11 Push ring base 12 Pushing member 13 Band part 14 Base part 15 Rack part 16 Slot 17 Groove 18 Engagement Protrusion 19 Through hole 20 Rack portion 21 Locking bolt 22 Spring 23 Nut 31 Fixing member 32 Moving member 33 Tool bolt A Auxiliary tool P ₁ Press mechanism W Rotating tool

Claims (3)

In order to ensure the sealing performance of the fitting with the insertion port (2) inserted into the receiving port (1), a step surface (4) is formed on the inner periphery of the receiving port (1) where the inner diameter changes from a large diameter to a small diameter. An annular sealing material (5) having elasticity is interposed between the inner peripheral surface of the receiving port (1) and the outer peripheral surface of the insertion port (2), and the sealing material (5) and the step surface (4) The pressing mechanism (P ₁ ) is inserted between the sealing member (5) and the sealing material (5) is pressed to the opposite side of the step surface (4) as the pressing mechanism (P ₁ ) extends in the tube axis direction. In the inner surface joint joint that is compressed into the inner peripheral surface of the receiving port (1) and the outer peripheral surface of the insertion port (2),
The pressing mechanism (P ₁ ) is a combination of a push wheel base (11) and a plurality of push members (12) arranged in the circumferential direction thereof, which can be slid in the tube axis direction by overlapping them on the front and back. (11) and the pressing member (12), the saw-toothed rack portions (15, 20) are opposed to each other, and are biased in the pressing direction by the spring (22),
One end of the pusher wheel base (11) abuts on the step surface (4) of the receiving port (1), the pusher member (12) is pushed out from the other end of the pusher wheel base (11) in the tube axis direction, and the pusher member (12 ), The pushing member (12) is detented by the meshing of the rack portions (15, 20) while the tip of the sealing material presses the sealing material (5), and the compressed state of the sealing material (5) in the tube axis direction is maintained. An inner surface joint joint characterized by being made.   An auxiliary tool (A) used for joining work of an inner joint according to claim 1, comprising a fixed member (31) and a moving member (32), and from the fixed member (31) to the moving member (32). The fixing member (31) and the moving member (32) are respectively inserted into the push wheel base (11) and the pressing member (12) from the portion through which the tool bolt (33) is inserted. The tool bolt (33) is rotatable with respect to the fixed member (31) and is screwed into the moving member (32). An auxiliary tool for joining an inner joint where the moving member (32) moves in the axial direction of the tool bolt (33) when the head of the bolt (33) is turned. A joining method for performing the joining operation of the inner joint according to claim 1 in a pipe using the auxiliary tool (A) according to claim 2,
With the insertion port (2) inserted into the receiving port (1), the sealing material (5) is inserted between the inner peripheral surface of the receiving port (1) and the outer peripheral surface of the insertion port (2),
Next, the pressing mechanism (P ₁ ) is connected between the sealing material (5) and the stepped surface (4) on the inner periphery of the receiving port (1), and one end of the pusher wheel base (11) is formed on the stepped surface (4). And is fitted so that the tip of the pressing member (12) is directed toward the sealing material (5),
Next, the leg portion of the fixing member (31) of the auxiliary tool (A) is engaged with the push wheel base (11), and the leg portion of the moving member (32) is engaged with the pressing member (12) to Turn the head of the bolt (33) with the rotary tool (W) to move the moving member (32) in the direction away from the fixed member (31), and resist the bias of the spring (22) to the rack portion (15, 20) is periodically disengaged, and the pushing member (12) is pushed out from the other end of the pusher wheel base (11) in the tube axis direction, thereby pushing the sealing material (5) to the specified amount by the pushing member (12). , Compressed in the direction of the tube axis, tightly contact the inner peripheral surface of the receiving port (1) and the outer peripheral surface of the insertion port (2), the push wheel base (11) and the pressing member (12) and the rack portion (15, 20) A joining method of an inner surface joint joint that is fixed in a meshed state.

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