JP2020076484A - Inner surface joint device, insertion member, and joint method - Google Patents

Abstract

To provide an inner surface joint device which enables reduction of the risk to a worker when the inner surface joint device is broken.SOLUTION: An inner surface joint device (1) includes: a first contact jig (12) which contacts with an insertion port side end surface of an existing pipe; a chain (30) which is connected to the first contact jig and applies tensile force, acting in a direction where a joint pipe is joined to the existing pipe, to the joint pipe to be joined to the existing pipe; and an auxiliary chain (14) which restricts movement of the chain if connection between the chain and the first contact jig is released.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inner surface joining device, an insertion member, and a joining method used for joining metal pipes.

  Patent Document 1 discloses an inner surface joining apparatus for joining resin pipes such as FRPM (Fiberglass Reinforced Plastic Mortar) pipes. The inner surface joining device is equipped with a reaction force jig that engages with the end face of the insertion port of the existing pipe that is inserted into the receiving port of another pipe, and a new pipe at the end farthest from the existing pipe. And a hook for joining with each other. A wire having one end connected to the reaction force jig and the other end connected to the joining hook draws the joining hook and the reaction force jig to each other, thereby creating a new pipe insertion port. The new pipe is joined to the existing pipe by being inserted into the pipe socket.

Patent No. 3392287

  By the way, in the case of joining a metal pipe such as a ductile pipe, for example, the insertion force becomes larger than in the case of joining a FRPM pipe. When a pipe is joined by the inner surface joining apparatus disclosed in Patent Document 1, if the insertion force becomes large, the inner surface joining apparatus may be damaged. If the inner surface joining device is damaged, there is a risk that the worker may be at risk due to a wire that is disconnected from the reaction force jig or a broken piece of the inner surface joining device.

  An object of one aspect of the present invention is to realize an inner surface joining apparatus or the like that can reduce the risk to an operator when the inner surface joining apparatus is damaged.

  In order to solve the above problems, an inner surface joining device according to one aspect of the present invention is an arm set having a plurality of telescopic arms extending toward each of a plurality of positions along the circumferential direction of an existing pipe, A first abutting jig which is provided at the tip of each of the plurality of arms and which abuts either the end face of the existing pipe on the insertion side or the expanded diameter part on the receiving side; A tension member that is coupled to a tool and that applies a tension in a direction in which the existing pipe is joined to a joining pipe that is newly joined to the existing pipe, and connects the tension member and the arm set. A restriction member that restricts movement of the tension member with respect to the arm set when the connection between the tension member and the first contact jig is released.

  According to the above configuration, the inner surface joining device makes contact with the end face of the existing pipe on the insertion port side by the first contact jig provided at the tip of the arm included in the arm set. The inner surface joining device joins the existing pipe and the joining pipe by applying tension to the joining pipe in a direction of joining the existing pipe by a tension member connected to the first contact jig.

  The tension member is restricted from moving with respect to the arm set by the restriction member when the connection between the tension member and the first contact jig is released. Therefore, when the connection between the tension member and the first contact jig is released, the tension member is less likely to reach an operator who works outside the joint pipe. Therefore, it is possible to reduce the danger to the operator when the inner surface joining device is damaged.

  Further, the insertion member according to one aspect of the present invention is (i) between a receiving port of an existing pipe and an insertion port of a joining pipe newly joined to the existing pipe, or (ii) Between the insertion port and the receiving port of the joining pipe that is newly joined to the existing pipe, it is provided so as to come into contact with each of a plurality of positions along the circumferential direction of the existing pipe, A plurality of second contact jigs and a connecting member that connects between the two second contact jigs facing each other among the plurality of second contact jigs are provided.

  According to the above configuration, the two second contact jigs that are used to join the pipes and face each other are connected by the connecting member. For example, when one of the two second abutting jigs abuts on the lower position along the circumferential direction of the pipe, the other of the two second abutting jigs abuts on the upper position along the circumferential direction of the pipe. Abut. Therefore, it is not necessary for the operator to hold the second contact jig inside the pipe in order to bring the second contact jig into contact with the upper position along the circumferential direction of the pipe. Therefore, since the worker can work outside the pipe, it is possible to reduce the risk of the worker when the inner surface joining device is damaged.

  Further, in the insertion member according to the aspect of the present invention, the connecting member may be a stretchable member capable of changing a distance between the two second contact jigs connected by the connecting member.

  According to the above configuration, the distance between the two second contact jigs can be made different between the case where the two second contact jigs are brought into contact with a plurality of positions along the circumferential direction of the existing pipe and the other case. For example, when the insertion member is moved, the distance between the two second abutting jigs can be made shorter by making it shorter than the distance when abutting at a plurality of positions along the circumferential direction of the existing pipe. Can be moved. Therefore, the convenience of the insertion member can be improved.

  Further, an inner surface joining apparatus according to an aspect of the present invention is provided at an arm set having a plurality of telescopic arms extending toward a plurality of positions along a circumferential direction of an existing pipe, and a tip of the arm. A first contact jig that contacts either the end surface of the existing pipe on the insertion side or the expanded portion on the receiving side, and is connected to the first contact jig and And a shielding member for shielding at least a part of the movement path of the object from the existing pipe to the joint pipe, for applying a tension in the direction in which the existing pipe is joined to the joint pipe to be newly joined. And

  According to the above configuration, the inner surface joining device makes contact with the end face of the existing pipe on the insertion port side by the first contact jig provided at the tip of the arm included in the arm set. The inner surface joining device joins the existing pipe and the joining pipe by applying tension to the joining pipe in a direction of joining the existing pipe by a tension member connected to the first contact jig.

  At this time, the shielding member shields at least a part of the movement path of the object from the existing pipe to the joining pipe. Therefore, when the inner surface joining device is broken inside the existing pipe, the possibility that fragments of the inner surface joining device reach the worker who works outside the joining pipe is reduced. Therefore, it is possible to reduce the danger to the operator when the inner surface joining device is damaged.

  Further, the inner surface joining device according to an aspect of the present invention may further include any of the above insertion members, and the shielding member may include a first shielding plate attached to the connecting member.

  According to the above configuration, the first shielding plate attached to the connecting member of the insertion member shields at least a part of the movement path of the object from the existing pipe to the joining pipe. Therefore, it is possible to reduce the danger to the operator when the inner surface joining device is damaged.

  Moreover, in the inner surface bonding apparatus according to an aspect of the present invention, the shielding member may include a second shielding plate attached to the tension member.

  According to the above configuration, the second shielding plate attached to the tension member shields at least a part of the movement path of the object from the existing pipe to the joining pipe. Therefore, it is possible to reduce the danger to the operator when the inner surface joining device is damaged.

  Further, the joining method according to an aspect of the present invention is an arm set including a plurality of telescopic arms extending toward a plurality of positions along a circumferential direction of an existing pipe. The first abutting jig provided at each tip is brought into contact with either the end face of the existing pipe on the insertion side or the enlarged diameter part on the receiving side to fix the arm set to the existing pipe. A step of connecting a tension member connected to the first contact jig to a joining pipe that is newly joined to the existing pipe, and a direction in which the tension member joins the existing pipe. The step of applying the tension of the above to the joining pipe, and in order to limit the movement of the tension member with respect to the arm set when the connection between the tension member and the first contact jig is released, Connecting a limiting member connected to the arm set to the tension member.

  According to the above-mentioned composition, the same effect as an inner surface joining device provided with the above-mentioned restriction member is produced.

  According to the inner surface bonding apparatus and the like according to the aspect of the present invention, it is possible to realize the inner surface bonding apparatus and the like that can reduce the risk to the operator when the inner surface bonding apparatus is damaged.

FIG. 3 is a side view showing the configuration of the tip of the arm in the inner surface joining apparatus according to the first embodiment. It is a figure for explaining the outline of the inner surface joining device concerning Embodiment 1. FIG. 3 is a front view showing a configuration of an insertion jig of the inner surface bonding apparatus according to the first embodiment. FIG. 3 is a front view showing a configuration of an upper socket jig and a lower socket jig of the inner surface bonding apparatus according to the first embodiment. FIG. 7 is a side view showing the configuration of the insertion member according to the second embodiment. It is a figure for explaining the outline of the inner surface joining device concerning Embodiment 3. FIG. 7 is an enlarged view of the vicinity of the shield plate and the insertion member in FIG. 6. It is the sectional view on the AA line of FIG. It is the BB sectional drawing of FIG. FIG. 10 is a diagram for explaining a joining method according to the fourth embodiment.

[Embodiment 1]
Hereinafter, one embodiment of the present invention will be described in detail. In the following description, the upper side and the lower side in the vertical direction may be simply referred to as “upper side” and “lower side”, respectively.

  FIG. 2 is a diagram for explaining the outline of the inner surface bonding apparatus 1 according to the present embodiment. FIG. 2 shows an example in which the joining pipe P2 is newly joined to the existing pipe P1. In each drawing, the direction parallel to the axis C of the existing pipe P1 and the junction pipe P2 is the z direction, the vertical direction is the y direction, and the direction perpendicular to both the z direction and the y direction is the x direction.

  The existing pipe P1 and the joint pipe P2 are both metal pipes whose axes C are arranged horizontally. However, the inner surface joining apparatus 1 may be used for joining a pipe made of metal, such as a pipe made of resin, for example.

  As shown in FIG. 2, the existing pipe P1 has an insertion port I1 and a receiving port R1. Further, the joint pipe P2 has an insertion port I2 and a receiving port R2. The diameters of the receiving ports R1 and R2 are formed to be larger than the diameters of the insertion ports I1 and I2, respectively. The joining pipe P2 is joined to the existing pipe P1 by inserting the insertion port I2 of the joining pipe P2 into the receiving port R1 of the existing pipe P1.

  As shown in FIG. 2, the inner surface joining apparatus 1 includes an insertion jig 10, an upper socket jig 21, a lower socket jig 22, a chain 30 (tension member), and an insertion member 5. Prepare The insertion jig 10 is arranged at the insertion opening I1 of the existing pipe P1. The socket jig 20 is arranged in the socket R2 of the joint pipe P2.

  The chain 30 connects the insertion jig 10 and the receiving jig 20 at a total of three points, two points on the upper side and one point on the lower side. The chain 30 includes a lever hoist 31 for adjusting the tension between the insertion jig 10 and the receiving jig 20. When the operator operates the lever hoist 31, the chain 30 applies tension to the joining pipe P2 in the direction of joining with the existing pipe P1. The chain 30 may have a configuration different from the lever hoist 31 capable of adjusting the tension between the insertion jig 10 and the receiving jig 20.

  The lever hoist 31 is located near the receiving port R2 of the joint pipe P2. Therefore, the operator can operate the lever hoist 31 from the outside of the joint pipe P2.

  The number of chains 30 may be two or four or more. Further, in the inner surface joining device 1, the insertion jig 10 and the receiving jig 20 may be connected by using, for example, a wire instead of the chain 30.

  The insertion member 5 is a member arranged between the receiving port R1 of the existing pipe P1 and the insertion port I2 of the joining pipe P2. The insertion member 5 will be described in detail in the second embodiment.

  FIG. 3 is a front view showing the configuration of the insertion jig 10 of the inner surface bonding apparatus 1 according to this embodiment. Here, the surface seen by the operator when the existing pipe P1 and the joining pipe P2 are joined by the inner surface joining device 1 is the front. As shown in FIG. 3, the insertion jig 10 includes an arm set 11, a first contact jig 12 and a stand 13. The insertion jig 10 further includes an auxiliary chain 14 (restriction member) described later.

  The arm set 11 has a plurality of telescopic arms extending toward a plurality of positions along the circumferential direction of the existing pipe P1. In the present embodiment, the inner surface bonding apparatus 1 includes three arms 111, 112 and 113. However, the inner surface bonding apparatus 1 may include two arms or four or more arms.

  Further, the arm of the conventional inner surface joining apparatus disclosed in Patent Document 1 is formed of a material and a thickness that can obtain strength corresponding to the insertion force when joining the FRPM pipe. However, in the present embodiment, since the existing pipe P1 and the joining pipe P2 are made of metal, the insertion force becomes large.

  An example of the metal pipe is a ductile cast iron pipe (hereinafter referred to as a ductile iron pipe). The ductile iron pipe has a structure in which the watertightness of the joint is secured by a rubber ring (sealing member) set on the inner surface of the receiving port.

  Due to the manufacturing method of the ductile iron pipe, the dimensional tolerance of the inner diameter of the receiving portion and the outer diameter of the insertion portion is relatively large as compared with a resin pipe such as a FRPM pipe. In order to ensure the required watertightness even when the inner diameter of the receiving part is inserted with the upper limit of the tolerance and the outer diameter of the opening is the lower limit of the tolerance, the ductile iron pipe is designed with a relatively large compression ratio of the rubber ring. ing. Therefore, when joining ductile iron pipes, a greater force is required to compress the rubber ring than when joining resin pipes such as FRPM pipes.

  Resin pipes such as FRPM pipes, which have low rigidity, are deformed in the radial direction during joining (the receiving part is deformed in the expanding direction and the insertion part is deformed in the contracting direction), which is necessary for compression of the rubber ring. The power decreases. On the other hand, in ductile iron pipes, which have high rigidity, it is difficult to expect a decrease in insertion force due to deformation.

  From the above, joining a ductile iron pipe requires a relatively large force (insertion force) as compared with a resin pipe such as a FRPM pipe. Therefore, the arms 111 to 113 are formed to be thicker than the arms of the above-described conventional inner surface joining apparatus, and have a structure capable of obtaining strength corresponding to the insertion force when joining the joining pipe P2 to the existing pipe P1. It is preferable to have.

  The first contact jig 12 is a member that contacts the end surface of the existing pipe P1 on the insertion port I1 side. The first contact jig 12 is provided at each tip of the arms 111 to 113. A chain 30 is connected to each of the first contact jigs 12.

  The stand 13 is a stand that supports the inner surface joining apparatus 1. Since the wheels 13a are provided on the lower portion of the stand 13, the insertion jig 10 can move in parallel to the axis C of the existing pipe P1 and the joining pipe P2.

  FIG. 1 is a side view showing a configuration of a tip of an arm 111 in the inner surface joining apparatus 1. The tips of the arms 112 and 113 have the same structure. As shown in FIG. 1, a hook portion 12a for attaching one end of the chain 30 is provided at one end of the first contact jig 12 in the Z-axis direction. Further, a hook portion 11 a for attaching one end of the auxiliary chain 14 is provided on the arm 111 near the first contact jig 12. The inner surface joining device 1 may include a wire or the like instead of the auxiliary chain 14.

  The auxiliary chain 14 limits the movement of the chain 30 with respect to the arm set 11 when the connection between the chain 30 and the first contact jig 12 is released. Therefore, for example, when the hook portion 12a of the first contact jig 12 is damaged and the chain 30 is disengaged from the first contact jig 12, the tip portion of the chain 30 connected to the hook portion 12a is joined. The risk of reaching the receiving port R2 of the pipe P2 is reduced.

  As described above, one end of the auxiliary chain 14 is attached to the hook portion 11a of the arm 111. The other end of the auxiliary chain 14 is attached to the chain 30. In the state where the chain 30 and the first contact jig 12 are connected at the hook portion 12a of the first contact jig 12, the auxiliary chain 14 is in a loose state at this time. Therefore, the tension applied by the auxiliary chain 14 to the arm 111 via the hook portion 11a is smaller than the tension applied by the chain 30 to the first contact jig 12. For example, in the above state, the tension applied to the arm 111 by the auxiliary chain 14 via the hook portion 11a may be 1/10 or less of the tension applied to the first contact jig 12 by the chain 30. As a result, when the hook portion 12a of the first contact jig 12 is damaged, the possibility that the auxiliary chain 14 is also damaged is reduced.

  A buffer member 12b is provided on the surface of the first contact jig 12 that contacts the end surface of the insertion port I1 of the existing pipe P1. The cushioning member 12b may be made of an elastic material such as rubber. An end portion of the cushioning member 12b on the side of the axis C of the cushioning member 12b in a cross section parallel to the axis C of the existing pipe P1 is farther from the axis C than the inner peripheral surface of the existing pipe P1.

  FIG. 4 is a front view showing the configuration of the upper socket jig 21 and the lower socket jig 22 of the inner surface bonding apparatus 1 according to the present embodiment. For simplicity, members other than the upper socket jig 21, the lower socket jig 22, and the joint pipe P2 are omitted in FIG. The upper socket jig 21 and the lower socket jig 22 both contact the end surface of the socket R2 of the joint pipe P2. In the example shown in FIG. 4, the chain connector 21 a is provided at two locations on the upper socket jig 21, and the chain connection portion 22 a is provided at one site on the lower socket jig 22. The chain 30 is connected to each of the chain connecting portions 21a and 22a.

  An example of the joining method for joining the joining pipe P2 to the existing pipe P1 by the inner surface joining device 1 is as follows. First, the first contact jig 12 provided at each tip of the arms 111 to 113 is brought into contact with the end surface of the existing pipe P1 on the insertion port I1 side, and the arm set 11 is fixed to the existing pipe P1. Next, the chain 30 connected to the first contact jig 12 is connected to the joint pipe P2 using the socket jig 20. Then, in order to limit the movement of the chain 30 with respect to the arm set 11 when the connection between the chain 30 and the first contact jig 12 is released, the auxiliary chain 14 connected to the arm set 11 is connected to the chain 30. Connect to. In this state, the chain 30 applies tension to the joining pipe P2 in the direction of joining with the existing pipe P1.

  Through the above steps, according to the inner surface joining device 1, the movement of the chain 30 with respect to the arm set 11 is restricted when the hook portion 12a of the first contact jig 12 or the like is damaged. Therefore, it is possible to reduce the risk to the operator when the inner surface joining device 1 is damaged. The order of the steps described above may be appropriately changed.

[Embodiment 2]
Another embodiment of the present invention will be described below. For convenience of description, members having the same functions as the members described in the above embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

  FIG. 5 is a side view showing the configuration of the insertion member 5 according to this embodiment. As shown in FIG. 5, the insertion member 5 includes two second contact jigs 51 and a connecting member 52. The number of the second contact jigs 51 included in the insertion member 5 is not limited to two as long as it is plural.

  The second contact jig 51 is a distance piece for joining the existing pipe P1 and the joining pipe P2 with a gap. The second contact jig 51 is provided so as to contact each of a plurality of positions along the circumferential direction of the existing pipe P1 between the receiving port R1 of the existing pipe P1 and the insertion port I2 of the joining pipe P2. .. By joining the existing pipe P1 and the joining pipe P2 while the second abutting jig 51 is in contact with the above position, the existing pipe P1 and the joining pipe P2 are joined together with a gap therebetween. It Therefore, when joining another pipe to the joining pipe P2, the first abutting jig 12 of the inner surface joining apparatus 1 may be inserted into the gap and brought into contact with the end face of the insertion port I2 of the joining pipe P2. it can.

  The connecting member 52 connects between the two second contact jigs 51 facing each other. As a result, the second contact jig 51 located on the upper side is supported by the second contact jig 51 and the connecting member 52 located on the lower side.

  Conventionally, in order to arrange the second contact jig 51 on the upper side of the joint pipe P2, it was necessary for an operator to support the second contact jig 51. That is, at the time of joining the existing pipe P1 and the joining pipe P2, the worker had to work in the existing pipe P1 or the joining pipe P2. Therefore, when an accident such as damage to the inner surface bonding apparatus 1 occurs, there is a risk that the worker may be at risk.

  According to the insertion member 5, the second contact jig 51 can be arranged on the upper side of the joining pipe P2 without the need of the operator's hand. Therefore, the worker can perform the work outside the joint pipe P2. Therefore, it is possible to reduce the danger of the operator in the event of an accident.

  The connecting member 52 in the present embodiment is an expandable member that can change the distance between the two second contact jigs 51 connected by the connecting member 52. Therefore, the convenience of the insertion member 5 is improved, for example, when the insertion member 5 is moved, the connection member 52 is kept in a contracted state to facilitate the movement. However, the connecting member 52 does not necessarily have to be a stretchable member, and may be a member whose distance between the two second contact jigs 51 cannot be changed.

[Embodiment 3]
Another embodiment of the present invention will be described below. The inner surface joining apparatus 1A according to the present embodiment includes a shield plate 61 (first shield plate) and a shield plate 71 (first shield plate) as shield members that shield at least a part of the movement path of the object from the existing pipe P1 to the joint pipe P2. A second shielding plate).

  FIG. 6 is a diagram for explaining the outline of the inner surface bonding apparatus 1A. As shown in FIG. 6, the inner surface joining apparatus 1 </ b> A is different from the inner surface joining apparatus 1 in that an insertion member 6 is provided instead of the insertion member 5, and that a partition 7 is further provided. The inner surface bonding apparatus 1A further includes the shield plates 61 and 71 described above.

  FIG. 7 is an enlarged view of the vicinity of the shield plate 61 and the insertion member 6 in FIG. FIG. 8 is a sectional view taken along the line AA of FIG. As shown in FIGS. 7 and 8, the insertion member 6 includes a mounting portion 62 for mounting the shielding plate 61 in addition to the configuration of the insertion member 5. The shield plate 61 is attached to the insertion member 6.

  The mounting portion 62 is a hook-shaped member for mounting the shielding plate 61. Note that the insertion member 6 may have another configuration that can attach the shielding plate 61 to the insertion member 6 instead of the attachment portion 62, such as a screw hole that is screwed into a screw that is inserted into a hole provided in the shielding plate 61. You may have.

  The shield plate 61 is a plate-shaped member formed of a translucent material such as polycarbonate. Therefore, the operator can visually recognize the region closer to the existing pipe P1 than the shield plate 61. Further, as shown in FIG. 8, the shielding plate 61 has a shape that does not interfere with the chain 30.

  However, the shielding plate 61 may be formed of a material having no light transmitting property. In that case, it is preferable that the inner surface bonding apparatus 1 </ b> A further includes an image pickup device for picking up a still image or a moving image in a region closer to the existing pipe P <b> 1 than the shield plate 61.

  FIG. 9 is a sectional view taken along line BB of FIG. As shown in FIG. 9, the partition 7 includes a shielding plate 71, an upper mounting portion 72 and a lower mounting portion 73. The shield plate 71 may be formed of a light-transmitting material such as polycarbonate, similar to the shield plate 61.

  The upper mounting portion 72 and the lower mounting portion 73 are members mounted on the upper side and the lower side of the shielding plate 71, respectively. The upper mounting portion 72 is provided with holes 72a and 72b through which the chain 30 is inserted. Further, the lower mounting portion 73 is provided with a hole 73a for inserting the chain 30. The partition 7 is attached to the chain 30 by inserting the chain 30 into the holes 72a, 72b and 73a. That is, in the example shown in FIG. 9, the shield plate 71 is attached to the chain 30.

  As described above, the inner surface bonding apparatus 1A includes the shielding plates 61 and 71 as shielding members. Therefore, when the insertion jig 10 or the like is damaged, the possibility that fragments or the like of the insertion jig 10 reach the operator is reduced. Therefore, the danger to the operator can be reduced.

  Further, the partition 7 is preferably arranged on the side of the existing pipe P1 with respect to the lever hoist 31, as shown in FIG. In this case, the operator can operate the lever hoist 31 without putting his or her hand toward the existing pipe P1 side of the partition 7. Therefore, the danger to the operator can be further reduced.

  The shielding member in the inner surface bonding apparatus may include both the shielding plates 61 and 71, or may include only one of them. That is, the inner surface bonding apparatus 1A may include only one of the shielding plates 61 and 71 described above, or may include both of them.

  Further, the shapes of the shielding plates 61 and 71 are not limited to the examples shown in FIGS. 8 and 9. In order to shield flying objects such as fragments of the insertion jig 10 over a wider area, it is preferable that the shape has an arc around it, an ellipse, or a perfect circle. On the other hand, from the viewpoint of facilitating the installation, the rectangular shape as shown in FIGS. 8 and 9 is preferable.

  Further, it is preferable that the shielding plates 61 and 71 are arranged so as to be able to shield at least the central portion in the cross section of the existing pipe P1 and the joining pipe P2.

  Further, the shielding plate may evenly shield the cross sections of the existing pipe P1 and the joint pipe P2. However, flying objects such as fragments of the insertion jig 10 move downward due to gravity in the process of flying to the receiving port R2 of the joint pipe P2, so shield the area below the center of the cross section in the vertical direction. This is more preferable because it can shield flying objects more effectively.

[Embodiment 4]
Another embodiment of the present invention will be described below. In the present embodiment, another example of the method of joining the joining pipe P2 to the existing pipe P1 will be described.

  The joining method of joining the insertion port I2 of the joining pipe P2 to the receiving port R1 of the existing pipe P1 as described above is called positive joining. On the other hand, in this embodiment, a joining method called reverse joining in which the receiving port R2 of the joining pipe P2 is joined to the insertion port I1 of the existing pipe P1 will be described.

  FIG. 10 is a diagram for explaining the joining method according to the present embodiment. In the example shown in FIG. 10, the first contact jig 12 of the insertion jig 10 is in contact with the expanded diameter portion Re1 of the existing pipe P1 on the receiving port R1 side. The enlarged diameter portion Re1 is a portion of the receiving port R1 that has a larger diameter than other portions of the existing pipe P1 in order to receive the insertion ports of other existing pipes.

  Further, in the example shown in FIG. 10, the second abutting jig 51 includes a plurality of the plurality of pipes along the circumferential direction of the joining pipe P2 between the insertion port I1 of the existing pipe P1 and the receiving port R2 of the joining pipe P2. Abut each of the positions. Furthermore, in the example shown in FIG. 10, the upper socket jig 21 and the lower socket jig 22 are in contact with the end surface of the insertion port I2 of the joint pipe P2.

  Also in the example shown in FIG. 10, the joining pipe P2 is joined to the existing pipe P1 by applying tension to the joining pipe P2 in the direction in which the chain 30 joins the existing pipe P1. As described above, the inner surface joining apparatus 1 can be used in a joining method of joining the joining pipe P2 to the existing pipe P1 by reverse joining. The same applies to the inner surface bonding apparatus 1A.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

1, 1A Inner surface joining device 5, 6 Insert member 11 Arm set 111, 112, 113 Arm 12 First contact jig 14 Auxiliary chain (restricting member)
30 chain (tensile member)
51 second contact jig 52 connecting member (expandable member)
61 Shield plate (first shield plate)
71 Shield plate (second shield plate)
I1, I2 insertion port R1, R2 receiving port Re1 diameter expansion part P1 existing pipe P2 joining pipe

Claims (7)

An arm set having a plurality of telescopic arms extending toward each of a plurality of positions along the circumferential direction of the existing pipe,
A first contact jig that is provided at each tip of the plurality of arms and that contacts either the end surface of the existing pipe on the insertion side or the expanded portion on the receiving side;
A tension member that is connected to the first contact jig and that applies a tension in a direction in which it is joined to the existing pipe to a joining pipe that is newly joined to the existing pipe;
A restriction member that connects the tension member and the arm set and restricts movement of the tension member with respect to the arm set when the connection between the tension member and the first contact jig is released. An inner surface bonding apparatus comprising: (I) Between the receiving port of the existing pipe and the insertion port of the joining pipe that is newly joined to the existing pipe, contact each of a plurality of positions along the circumferential direction of the existing pipe, Or (ii) between the insertion port of the existing pipe and the receiving port of the joining pipe that is newly joined to the existing pipe, contacting each of a plurality of positions along the circumferential direction of the joining pipe. A plurality of second contact jigs provided,
An insertion member, comprising: a connecting member that connects between two second abutting jigs facing each other among the plurality of second abutting jigs.   The insertion member according to claim 2, wherein the connecting member is a stretchable member capable of changing a distance between the two second contact jigs connected by the connecting member. An arm set having a plurality of telescopic arms extending toward each of a plurality of positions along the circumferential direction of the existing pipe,
A first contact jig that is provided at the tip of the arm and that contacts either the end face of the existing pipe on the insertion side or the expanded portion on the receiving side;
A tension member that is connected to the first contact jig and that applies a tension in a direction in which it is joined to the existing pipe to a joining pipe that is newly joined to the existing pipe;
An inner surface joining apparatus, comprising: a shield member that shields at least a part of a movement path of an object from the existing pipe to the joint pipe. Further comprising the insertion member according to claim 2 or 3,
The inner surface bonding apparatus according to claim 4, wherein the shielding member includes a first shielding plate attached to the connecting member.   The inner surface bonding apparatus according to claim 4, wherein the shield member includes a second shield plate attached to the tension member. For an arm set having a plurality of telescopic arms extending toward a plurality of positions along the circumferential direction of an existing pipe, a first contact jig provided at each tip of the plurality of arms, A step of fixing the arm set to the existing pipe by bringing it into contact with either the insertion-side end surface of the existing pipe or the expanded-diameter portion on the receiving side;
Connecting the tension member connected to the first contact jig to a joining pipe that is newly joined to the existing pipe;
The tension member applies tension to the joining pipe in a direction to be joined to the existing pipe,
In order to limit the movement of the tension member with respect to the arm set when the connection between the tension member and the first contact jig is released, a limiting member connected to the arm set is used as the tension member. And a step of connecting to the above.

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