JP2022132555A - Insertion member and inner surface joint device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner surface joint device which enables reduction of danger caused to a worker when the inner surface joint device is damaged.

SOLUTION: An inner surface joint device (1) includes: a first contact jig (12) which contacts with an end surface at a socket side of an existing pipe; a chain (30) which is connected to the first contact jig and applies a tensile force to a joint pipe to be joined to the existing pipe in a direction such that the joint pipe is joined to the existing pipe; and an auxiliary chain (14) which restricts movement of the chain when connection between the chain and the first contact jig is released.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to an insertion member and an inner surface joining apparatus used for joining metal pipes.

Patent Literature 1 discloses an inner surface joining apparatus for joining resin pipes such as FRPM (Fiberglass Reinforced Plastic Mortar) pipes. The inner surface joining device includes a jig for reaction force that engages the end face of the insertion port of the existing pipe that is inserted into the socket of another pipe, and a jig that attaches to the end of the new pipe farther from the existing pipe and mating hooks. A wire having one end connected to a reaction jig and the other end connected to a joining hook pulls the joining hook and the reaction jig together, thereby inserting a new pipe into the existing pipe. Inserted into the pipe socket, the new pipe is joined to the existing pipe.

Japanese Patent No. 3392287

By the way, when joining metal pipes such as ductile pipes, for example, the insertion force is greater than in the case of joining FRPM pipes. When pipes are joined by the inner surface joining apparatus disclosed in Patent Document 1, there is a risk that the inner surface joining apparatus will be damaged if the insertion force becomes large. If the inner surface bonding device is damaged, a wire disconnected from the reaction jig or fragments of the damaged inner surface bonding device may pose a danger to the operator.

An object of one aspect of the present invention is to realize an inner surface bonding apparatus and the like that can reduce the danger to a worker when the inner surface bonding apparatus is damaged.

The insertion member according to one aspect of the present invention is positioned between (i) the socket of the existing pipe and the insertion port of the joint pipe to be newly joined to the existing pipe, or (ii) the insertion port of the existing pipe. and a socket of a joint pipe to be newly joined to the existing pipe. and a connecting member that connects two second contact jigs facing each other among the plurality of second contact jigs.

According to the above configuration, the two opposing second contact jigs used when joining pipes are connected by the connecting member. For example, when one of the two second contact jigs contacts a lower position along the circumferential direction of the pipe, the other of the two second contact jigs contacts an upper position along the circumferential direction of the pipe. abut. Therefore, there is no need 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 danger to the worker when the inner surface joining device is damaged.

Moreover, the insertion member which concerns on 1 aspect of this invention WHEREIN: The expansion-contraction member which can change the distance between said two 2nd contact jig|tools connected with the said connection member may be sufficient as the said connection member.

According to the above configuration, the distance between the two second contact jigs can be made different between the case of contacting a plurality of positions along the circumferential direction of the existing pipe and other cases. For example, when moving the insertion member, by making the distance between the two second contact jigs shorter than the distance when contacting a plurality of positions along the circumferential direction of the existing pipe, it is possible to easily can be moved. Therefore, the convenience of the insertion member can be improved.

Further, an inner surface bonding apparatus according to an aspect of the present invention includes an arm set having a plurality of telescopic arms extending toward a plurality of positions along the circumferential direction of an existing pipe, and , a first contact jig that contacts either the end face on the insertion port side of the existing pipe or the enlarged diameter portion on the socket side of the existing pipe; a tension member that applies tension in the direction of joining the existing pipe to the joining pipe to be newly joined by the above-mentioned method; And prepare.

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

At this time, the shielding member shields at least part of the movement path of the object from the existing pipe to the joint pipe. Therefore, when the inner surface bonding device is damaged inside the existing pipe, there is a reduced risk that fragments of the inner surface bonding device or the like will reach a worker working outside the joint pipe. Therefore, it is possible to reduce the danger to the operator when the inner surface bonding device is damaged.

Further, the inner surface bonding apparatus according to an aspect of the present invention may further include any one of the inserting members described above, 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 part of the moving path of the object from the existing pipe to the joint pipe. Therefore, it is possible to reduce the danger to the operator when the inner surface bonding 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 shield plate attached to the tension member shields at least part of the moving path of the object from the existing pipe to the joint pipe. Therefore, it is possible to reduce the danger to the operator when the inner surface bonding device is damaged.

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 danger to the operator when the inner surface bonding apparatus is damaged.

4 is a side view showing the configuration of the tip of an arm in the inner surface bonding apparatus according to Embodiment 1. FIG. 1 is a diagram for explaining an outline of an inner surface bonding apparatus according to Embodiment 1; FIG. 4 is a front view showing the configuration of an insertion opening jig of the inner surface bonding apparatus according to Embodiment 1. FIG. 4 is a front view showing the configuration of an upper side socket jig and a lower side socket jig of the inner surface bonding apparatus according to Embodiment 1. FIG. FIG. 11 is a side view showing the configuration of an insertion member according to Embodiment 2; FIG. 11 is a diagram for explaining an outline of an inner surface bonding apparatus according to Embodiment 3; FIG. 7 is an enlarged view of the vicinity of the shielding plate and the insertion member in FIG. 6; FIG. 7 is a cross-sectional view taken along the line AA of FIG. 6; FIG. 7 is a cross-sectional view taken along the line BB of FIG. 6; FIG. 11 is a diagram for explaining a joining method according to Embodiment 4;

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

FIG. 2 is a diagram for explaining the outline of the inner surface bonding apparatus 1 according to this embodiment. FIG. 2 shows an example in which a joint 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 joint 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.

Both the existing pipe P1 and the joint pipe P2 are metal pipes with the axis C arranged horizontally. However, the inner surface bonding apparatus 1 may be used for bonding non-metal pipes such as resin pipes.

As shown in FIG. 2, the existing pipe P1 has an insertion port I1 and a socket R1. Also, the joint pipe P2 has an insertion port I2 and a socket R2. The diameters of the sockets R1 and R2 are formed larger than the diameters of the insertion openings I1 and I2, respectively. The connection pipe P2 is connected to the existing pipe P1 by inserting the spigot I2 of the connection pipe P2 into the socket R1 of the existing pipe P1.

As shown in FIG. 2, the inner surface bonding 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 spigot jig 10 is arranged at the spigot 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 socket jig 20 at a total of three points, two points on the upper side and one point on the lower side. The chain 30 has a lever hoist 31 for adjusting tension between the spigot jig 10 and the socket 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. Note that the chain 30 may have a configuration different from that of the lever hoist 31 that can adjust the tension between the insertion jig 10 and the socket jig 20 .

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

Note that the number of chains 30 may be two or four or more. Further, in the inner surface bonding apparatus 1 , instead of the chain 30 , for example, a wire may be used to connect the insertion jig 10 and the socket jig 20 .

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

FIG. 3 is a front view showing the configuration of the insertion opening jig 10 of the inner surface bonding apparatus 1 according to this embodiment. Here, the front side is the side that can be seen by the operator when the existing pipe P1 and the joint pipe P2 are joined by the inner surface joining apparatus 1 . 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 opening jig 10 further includes an auxiliary chain 14 (limiting member), which will be described later.

The arm set 11 has a plurality of telescoping arms extending toward a plurality of positions along the circumferential direction of the existing pipe P1. In this embodiment, the device for bonding internal surfaces 1 includes three arms 111 , 112 and 113 . However, the inner surface bonding apparatus 1 may have two 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 thickness sufficient to obtain strength corresponding to the insertion force when joining FRPM pipes. However, in this embodiment, since the existing pipe P1 and the joint pipe P2 are made of metal, the insertion force is increased.

An example of a metal pipe is a ductile cast iron pipe (hereinafter referred to as a ductile iron pipe). Ductile iron pipes have a structure that ensures the watertightness of joints by a rubber ring (seal member) set on the inner surface of the socket.

Ductile iron pipes have relatively large dimensional tolerances for the inner diameter of the socket and the outer diameter of the insertion port due to the manufacturing method compared to resin pipes such as FRPM pipes. In ductile iron pipes, the compression rate of the rubber ring is designed to be relatively large in order to ensure the specified watertightness even when the socket inner diameter is the upper tolerance limit and the insert outer diameter is the lower tolerance limit. ing. Accordingly, when joining a ductile iron pipe, a larger force is required to compress the rubber ring than when joining a resin pipe such as an FRPM pipe.

Resin pipes such as FRPM pipes, which have low rigidity, are deformed in the radial direction when joined (the socket part is deformed in the direction of expanding the diameter, and the insertion part is deformed in the direction of contracting the diameter). power is reduced. On the other hand, the ductile iron pipe, which has a high rigidity, cannot be expected to reduce the insertion force due to deformation.

For the above reasons, a relatively large force (insertion force) is required to join ductile iron pipes compared to resin pipes such as FRPM pipes. Therefore, the arms 111 to 113 are formed 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 joint 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 111-113. A chain 30 is connected to each of the first contact jigs 12 .

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

FIG. 1 is a side view showing the configuration of the distal end of an arm 111 in the internal bonding apparatus 1. FIG. The tips of arms 112 and 113 also have the same configuration. 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 near the first contact jig 12 of the arm 111 . Note that the inner surface bonding apparatus 1 may be provided with 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 armset 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 separated from the first contact jig 12, the tip of the chain 30 connected to the hook portion 12a is joined. The risk of reaching the receptacle R2 of the pipe P2 is reduced.

One end of the auxiliary chain 14 is attached to the hook portion 11a of the arm 111 as described above. The other end of auxiliary chain 14 is attached to 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 slack state at this time. Therefore, the tension applied to the arm 111 by the auxiliary chain 14 via the hook portion 11 a is smaller than the tension applied to the first contact jig 12 by the chain 30 . For example, the tension applied to the arm 111 by the auxiliary chain 14 via the hook portion 11a in the above state 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 risk of the auxiliary chain 14 also being damaged is reduced.

A buffer member 12b is provided on the surface of the first contact jig 12 that contacts the end face of the insertion port I1 of the existing pipe P1. The cushioning member 12b may be made of an elastic material such as rubber. In a cross section parallel to the axis C of the existing pipe P1, the end of the cushioning member 12b on the axis C side is farther away 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 this embodiment. For the sake of simplicity, members other than the upper socket jig 21, the lower socket jig 22, and the joint pipe P2 are omitted in FIG. Both the upper socket jig 21 and the lower socket jig 22 abut on the end surface of the socket R2 of the joint pipe P2. In the example shown in FIG. 4, the upper socket jig 21 is provided with two chain connection portions 21a, and the lower socket jig 22 is provided with one chain connection portion 22a. A 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 apparatus 1 is as follows. First, the first contact jigs 12 provided at the tips of the arms 111 to 113 are brought into contact with the end surface of the existing pipe P1 on the insertion port I1 side to fix the arm set 11 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 . Subsequently, in order to limit the movement of the chain 30 with respect to the armset 11 when the connection between the chain 30 and the first contact jig 12 is released, the auxiliary chain 14 connected to the armset 11 is attached 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.

According to the inner surface bonding apparatus 1, movement of the chain 30 with respect to the arm set 11 is restricted by the above steps when the hook portion 12a of the first contact jig 12 or the like is damaged. Therefore, it is possible to reduce the danger to the operator when the inner surface bonding apparatus 1 is damaged. Note that the order of the steps described above may be changed as appropriate.

[Embodiment 2]
Other embodiments of the invention are described below. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and 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 . In addition, 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 therebetween. The second contact jig 51 is provided between the socket R1 of the existing pipe P1 and the insertion port I2 of the joint pipe P2 so as to contact each of a plurality of positions along the circumferential direction of the existing pipe P1. . By joining the existing pipe P1 and the joining pipe P2 with the second contact jig 51 in contact with the above position, the existing pipe P1 and the joining pipe P2 are joined with a gap therebetween. be. Therefore, when joining another pipe to the joining pipe P2, the first contact jig 12 of the inner surface joining apparatus 1 can be inserted into the gap and brought into contact with the end surface of the insertion opening I2 of the joining pipe P2. can.

The connecting member 52 connects the two second contact jigs 51 facing each other. Thereby, the second contact jig 51 positioned on the upper side is supported by the second contact jig 51 and the connecting member 52 positioned on the lower side.

Conventionally, an operator had to support the second contact jig 51 in order to arrange the second contact jig 51 above the joint pipe P2. That is, when joining the existing pipe P1 and the joint pipe P2, the operator had to work inside the existing pipe P1 or the joint pipe P2. Therefore, if an accident occurs, such as damage to the inner surface bonding apparatus 1, there is a risk that the operator will be in danger.

According to the insertion member 5, the second contact jig 51 can be arranged above the joint pipe P2 without relying on the operator's hand. Therefore, the worker can work outside the joint pipe P2. Therefore, it is possible to reduce the danger to the worker when an accident occurs.

Also, the connecting member 52 in this embodiment is an elastic member capable of changing the distance between the two second contact jigs 51 connected by the connecting member 52 . For this reason, for example, when the insertion member 5 is to be moved, the convenience of the insertion member 5 is improved, for example, by keeping the connecting member 52 in a contracted state to facilitate the movement. However, the connecting member 52 does not necessarily have to be an elastic member, and may be a member in which the distance between the two second contact jigs 51 cannot be changed.

[Embodiment 3]
Other embodiments of the invention are described below. The inner surface bonding apparatus 1A according to the present embodiment includes a shielding plate 61 (first shielding plate) and a shielding plate 71 ( second shield 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 bonding apparatus 1A differs from the inner surface bonding apparatus 1 in that an insertion member 6 is provided instead of the insertion member 5 and a screen 7 is further provided. In addition, the inner surface bonding apparatus 1A further includes shielding plates 61 and 71 described above.

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

The attachment portion 62 is a hook-shaped member for attaching the shielding plate 61 . It should be noted that the insertion member 6 may have another configuration capable of attaching the shielding plate 61 to the insertion member 6, such as a screw hole that is screwed with a screw that is inserted into a hole provided in the shielding plate 61, instead of the mounting portion 62. may have.

The shielding plate 61 is a plate-like member made of a translucent material such as polycarbonate. Therefore, the operator can visually recognize the area closer to the existing pipe P1 than the shield plate 61 is. Moreover, 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 made of a material that does not transmit light. In that case, the inner surface bonding apparatus 1A preferably further includes an imaging device for imaging a still image or a moving image of the area closer to the existing pipe P1 than the shield plate 61 is.

9 is a cross-sectional view taken along line BB of FIG. 6. FIG. As shown in FIG. 9 , the screen 7 includes a shielding plate 71 , an upper mounting portion 72 and a lower mounting portion 73 . As with the shielding plate 61, the shielding plate 71 may be made of a translucent material such as polycarbonate.

The upper attachment portion 72 and the lower attachment portion 73 are members attached to the upper and lower sides 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. A hole 73a for inserting the chain 30 is provided in the lower mounting portion 73. As shown in FIG. The screen 7 is attached to the chain 30 by inserting the chain 30 through the holes 72a, 72b and 73a. That is, in the example shown in FIG. 9, the shielding plate 71 is attached to the chain 30. As shown in FIG.

As described above, the inner surface bonding apparatus 1A includes shielding plates 61 and 71 as shielding members. Therefore, when the inserting jig 10 or the like is damaged, the risk of fragments of the inserting jig 10 or the like reaching the operator is reduced. Therefore, the worker's danger can be reduced.

In addition, as shown in FIG. 6, the screen 7 is preferably arranged closer to the existing pipe P1 than the lever hoist 31 is. In this case, the operator can operate the lever hoist 31 without sticking his hand to the existing pipe P1 side of the screen 7. - 特許庁Therefore, the worker's danger can be further reduced.

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

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

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

Further, the shield plate may evenly shield the sections of the existing pipe P1 and the joint pipe P2. However, since flying objects such as fragments of the spigot jig 10 move downward due to gravity in the process of flying to the receptacle R2 of the joint pipe P2, it is necessary to shield the lower side than the center of the cross section in the vertical direction. can more effectively shield flying objects, which is more preferable.

[Embodiment 4]
Other embodiments of the invention are described below. In this embodiment, another example of the method of joining the joint pipe P2 to the existing pipe P1 will be described.

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

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

Further, in the example shown in FIG. 10, the second contact jig 51 includes a plurality of joint pipes P2 along the circumferential direction between the insertion opening I1 of the existing pipe P1 and the socket R2 of the joint 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 opening I2 of the joint pipe P2.

In the example shown in FIG. 10 as well, the chain 30 applies tension to the joining pipe P2 in the direction in which it joins the existing pipe P1, thereby joining the joining pipe P2 to the existing pipe P1. In this manner, the inner surface joining apparatus 1 can be used for a joining method for joining the joining pipe P2 to the existing pipe P1 by reverse joining. The same applies to the inner surface bonding apparatus 1A.

[another expression of the invention]
The present invention is also expressed as follows.

An inner surface bonding apparatus according to an aspect of the present invention includes an arm set having a plurality of telescopic arms extending toward a plurality of positions along the circumferential direction of an existing pipe, and tip ends of the plurality of arms. and a first contact jig that contacts either the end face on the insertion port side of the existing pipe or the enlarged diameter portion on the socket side of the existing pipe; A tension member that applies tension in a direction in which a joint pipe to be newly joined to the pipe is joined to the existing pipe, and the tension member and the arm set are connected, and the tension member and the first a limiting member for limiting movement of the tension member relative to the armset when decoupled from the abutment fixture.

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

The tension member is restricted from movement relative to the armset when the tension member and the first abutment are disengaged by the limit member. Therefore, when the connection between the tension member and the first abutting jig is released, the risk of the tension member reaching a worker who is working outside the joint pipe is reduced. Therefore, it is possible to reduce the danger to the operator when the inner surface bonding device is damaged.

In addition, in a joining method according to an aspect of the present invention, an arm set including a plurality of telescopic arms extending toward a plurality of positions along the circumferential direction of an existing pipe is provided. A first contact jig provided at each tip is brought into contact with either the end face of the existing pipe on the insertion port side or the enlarged diameter portion on the socket side of the existing pipe to fix the arm set to the existing pipe. a step of connecting a tension member connected to the first contact jig to a joint pipe that is newly joined to the existing pipe; and a direction in which the tension member is joined to the existing pipe. and for limiting movement of the tension member relative to the armset when the tension member and the first abutment jig are disconnected from each other. connecting a restriction member connected to the armset to the tension member.

According to said structure, there exists an effect similar to the inner surface joining apparatus provided with the limiting member mentioned above.

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

Reference Signs List 1, 1A Inner surface bonding device 5, 6 Insertion member 11 Arm set 111, 112, 113 Arm 12 First contact jig 14 Auxiliary chain (limiting member)
30 chain (tension member)
51 second contact jig 52 connecting member (expandable member)
61 shielding plate (first shielding plate)
71 shielding plate (second shielding plate)
I1, I2 Insertion port R1, R2 Receptacle Re1 Expanded diameter portion P1 Existing pipe P2 Joint pipe

Claims (5)

(i) abutting on each of a plurality of positions along the circumferential direction of the existing pipe between the socket of the existing pipe and the insertion port of the joint pipe to be newly joined to the existing pipe; or (ii) between the insertion port of the existing pipe and the socket of the joint pipe to be newly joined to the existing pipe, so as to abut on each of a plurality of positions along the circumferential direction of the joint pipe. a plurality of second contact jigs provided;
and a connecting member that connects two of the plurality of second contact jigs facing each other. 2. The insertion member according to claim 1, wherein the connecting member is an expandable member capable of changing the distance between the two second contact jigs connected by the connecting member. an arm set having a plurality of telescoping arms extending toward a plurality of positions along the circumferential direction of the existing pipe;
a first abutment jig provided at the tip of the arm and abutted against either the end face of the existing pipe on the insertion port side or the enlarged diameter portion on the socket side;
a tension member connected to the first abutment jig and applying tension to a joining pipe to be newly joined to the existing pipe in a direction in which the joining pipe is joined to the existing pipe;
and a shielding member that shields at least part of a movement path of an object from the existing pipe to the joint pipe. further comprising an insert according to claim 1 or 2,
4. The inner surface bonding apparatus according to claim 3, wherein the shielding member includes a first shielding plate attached to the connecting member. 5. The apparatus of claim 3 or 4, wherein the shielding member includes a second shielding plate attached to the tension member.

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