JP5883327B2 - Lining method, reduced-diameter coil molded body used in the method, and rehabilitation pipeline - Google Patents

Description

  The present invention relates to a lining method, a reduced diameter coil molded body used for the lining method, and a rehabilitated pipeline, and more particularly to a lining method for forming a lining pipe in an existing pipe, a reduced diameter coil molded body used for the lining method, and a rehabilitated pipeline.

  An example of a conventional lining method is disclosed in Patent Document 1. In the technology of this Patent Document 1, a part of the liner pipe (lining pipe) in the circumferential direction is pushed inward in the radial direction, and the diameter is reduced to a substantially heart-shaped cross section. Then, with the liner pipe inserted into the existing pipe, heating steam having a predetermined pressure is supplied to the inside of the liner pipe to restore the cross-sectional shape to a substantially circular shape, thereby repairing the existing pipe.

  Further, in Patent Document 2, reinforcing bars are spirally arranged in a pipe (existing pipe), a liner strip is spirally wound from above to form a liner (lining pipe), and then on the back of the liner. A lining method for filling a backfill material is disclosed.

Furthermore, the inventors of the present application have proposed a lining method using a coil molded body in Patent Document 3. In Patent Document 3, a coil molded body having a reduced diameter is inserted into an existing pipe, the coil molded body is restored to the original diameter in the existing pipe, and then the lining material is lined in the existing pipe by a lining material inserted into the coil molded body. A tube is formed.
JP 2000-343606 [B29C 63/34] JP-A-8-2777992 [F16L 55/16] JP2011-158087 [F16L 1/00]

  In the technique of Patent Document 1, in order to give a flattened strength sufficient to withstand the buried earth pressure or the like to the restored liner pipe, the thickness of the pipe wall of the liner pipe must be increased. However, if the thickness of the pipe wall of the liner pipe is increased, it takes time for a series of processes such as heating the liner pipe in the existing pipe to expand the diameter or cooling the liner pipe.

  Further, in the technique of Patent Document 2, since the reinforcing bar functions as a reinforcing material, it is not necessary to give the liner itself flat strength, but it is necessary for the worker to enter the pipe and arrange the wire in a spiral shape. It takes a lot of work.

  On the other hand, in the technique of Patent Document 3, the thickness of the pipe wall of the lining material can be reduced by giving the coil molded body an external pressure strength against the buried earth pressure, so that the time for forming the lining pipe is shortened. In addition, it is only necessary to reduce the diameter of the coil molded body and insert it into the existing pipe. It does not take. However, the work of pulling the coil molded body into the existing pipe while pulling the coil molded body connected to the entire length of the existing pipe and reducing the diameter at the construction site is complicated. In addition, since the work of inserting and restoring the coil compacts one by one into the existing pipe is inefficient, there has been a demand for easier and more efficient construction.

  Therefore, a main object of the present invention is to provide a novel lining method, a reduced diameter coil formed body used therefor, and a rehabilitation pipe line.

  Another object of the present invention is to provide a lining method, a reduced-diameter coil molded body used therefor, and a rehabilitation pipe line that are excellent in workability.

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

A first invention is a lining method in which a coil molded body is laid in an existing pipe having an inlet and an outlet, and a lining pipe is formed with a lining material in the coil molded body. A step of sequentially inserting a plurality of coil molded bodies holding the diameters from the inlet and arranging them in the existing pipe over the entire length of the existing pipe from the inlet to the outlet ; (b) at least located on the most outlet side of the existing pipe Removing the holder of the coil molded body holding one reduced diameter state, restoring the coil molded body from the reduced diameter state, and (c) holding from at least one coil molded body in step (b) after removing the tool, before removing the retainer from the coil molded product that retains the state of being reduced in diameter adjacent thereto, the coil molded product of a state of being restored Ri inlet side coil molded body holds all reduced-diameter allowed state located is moved to the outlet side, comprising the steps of packing an interval caused by obtained by restoring the coil molded, step (b) and (C) is repeated, and the coil forming body arranged in the existing pipe is restored from the reduced diameter state , and (d) a lining pipe is formed with a lining material laid in the coil molding body. It is a construction method.

In the first invention, in step (a), the holder (10) is attached to the coil molded body (14) that has been reduced in diameter by applying a rotational force in the winding direction, and the reduced diameter state is maintained. The coil molded bodies are sequentially inserted into the existing pipe (100) by the pressing means (108) or the like, and the coil molded bodies whose diameter is reduced by the holder are arranged in parallel over the entire length of the existing pipe. In step (b), the holder is removed from at least one coil molded body located on the innermost side of the existing pipe, for example, on the outlet (104) side, and the coil molded body is restored from the reduced diameter state. In step (c), before removing the holder from the coil molded body holding the reduced diameter adjacent to the restored coil molded body, all the shrinkage positioned on the inlet side from the restored coil molded body. The coil formed body that maintains the diameter is moved to the outlet side, and the interval generated by restoring the coil formed body is reduced. Repeat the operation of removing the holder from the coil molded body in step (b) and the operation of closing the interval generated by restoring the coil molded body in step (c). Is restored from the reduced diameter state. In step (d) , the lining material (16) is laid in the coil molded body laid in the existing pipe, and the lining material, for example, the rehabilitating pipeline ( 12).

  According to the first invention, the lining method for forming the rehabilitation pipe line in the existing pipe can be further simplified and improved in efficiency.

The second invention is dependent on the first invention, and in step (c), a coil molded body that maintains the reduced diameter position positioned closest to the inlet side by the pressing means installed in the inlet- side manhole of the existing pipe is provided. and pressed, and holds all the state of being contracted and the coil molded is moved to the outlet side located it from the outlet side, eliminate gaps caused by obtained by restoring the coil molded.

In the second aspect of the invention, in step (c), it is positioned closest to the front (entrance) side by the pressing means (108) installed on the manhole (106) on the front side of the existing pipe (100), for example, on the inlet (102) side. The coil forming body (14) to be pressed is pressed, and all the coil forming bodies arranged in parallel to the back (exit) side are advanced to close the intervals generated by restoring the coil forming body.

According to the second invention, when the coil molded body is pushed into the existing pipe, the construction cost can be reduced by closing the gap between the coil molded bodies with the same equipment.
A third invention is dependent on the second invention, and in step (c), a coil molded body holding a new reduced diameter state is disposed in the inlet-side manhole, and the new coil molded body is pressed by the pressing means. By pressing in step (b), the coil molded body holding all the reduced diameter positions located on the outlet side is moved to the outlet side.
In the third invention, when the end of the coil molded body that has been held in a state where the diameter has been reduced is pushed into the existing pipe and cannot be pressed by the pressing means, the interval generated by restoring the coil molded body is reduced. In such a case, the coil molded body holding the newly reduced diameter is arranged in the inlet side manhole, and the coil molded body holding all the reduced diameters is pressed by pressing it with the pressing means. Move to.
The fourth invention is dependent on any one of the first to third inventions, and in step (a), in the exit-side manhole of the existing pipe, the coil forming that maintains the reduced diameter state inserted into the existing pipe In the state where the stopper for preventing the body from entering the exit side manhole is installed, the coil molded body holding the reduced diameter state is sequentially inserted into the existing pipe.
In the fourth aspect of the invention, since the coil molded body holding the reduced diameter state is sequentially inserted into the existing pipe with the stoppers (114, 118) installed in the outlet side manhole (116), it is inserted into the existing pipe. It can prevent that a coil molded object comes out in an exit side manhole.

The fifth invention is dependent on any one of the first to fourth inventions. (E) Before step (d) , the holder removed from the coil molded body in step (b) is recovered outside the existing pipe. Further comprising the step of:

In the fourth invention, in step (e) , for example, every time the holder (10) is removed from the coil molded body (14) and returned to the original diameter, or the coil is laid in the existing pipe (100). After returning all the bodies to the original diameter, the holder removed from the coil molded body (14) is recovered outside the existing pipe. For example, as a method of recovering the coil molded body holder, there is a method of recovering by remotely operating the in-pipe robot, or a method of recovering by pulling the wire fastened to the holder from a manhole (106, 116) or the like. is there.

A sixth invention is a lining construction method in which a coil molded body is laid in an existing pipe and a lining pipe is formed by a lining material in the coil molded body, and (a) by attaching a holder to which a wire is attached. A step of laying a plurality of coil molded bodies holding the reduced diameter state in the existing pipe, (b) in order from the coil molded body located on the innermost side of the existing pipe to the coil molded body located on the most front side Removing the holder from the coil molded body by pulling the wire, restoring the coil molded body from the reduced diameter state, and (c) removing the holder from the at least one coil molded body in step (b). After that, before removing the holder from the next coil forming body adjacent to it, move the coil forming body laid in the existing pipe from the near side to the far side of the existing pipe. Pressure and compressing the interval formed by restoring the coil molded body, and repeating steps (b) and (c) to restore all the coil molded bodies laid in the existing pipe from a reduced diameter state it is provided with a step of forming a lining pipe by further (d) lining material which is laid on the coil-forming body, a La innings method.

In the sixth invention, in step (a), the wire (34) is attached to, for example, the connecting member (24) or the wire insertion member (30) of the holding jig (10) attached to the coil molded body (14). . In step (b), the holder is removed from the coil molded body by pulling the wire, for example, by removing the connecting member.

According to the sixth aspect of the invention, it is not necessary to remove the holder by remotely operating an in-pipe robot or the like, so that the workability can be further improved.

A seventh invention is a reduced-diameter coil molded body used in the lining method according to any one of the first to sixth inventions, wherein the coil molded body is reduced in diameter by applying a rotational force in the winding direction. A contact member that is provided so as to be in contact with the inner surface side of the coil molded body and aligns the wires arranged in the axial direction of the coil molded body, and a connecting member that removably connects the both end portions of the coil molded body and the contact member A reduced-diameter coil molded body.

  In the seventh invention, the reduced diameter coil molded body is obtained by holding the coil molded body (14) reduced in diameter by applying a rotational force in the winding direction by the holder (10). Yes, it has a contact member (22) and a connecting member (24). The abutting member comes into contact with the inner surface side along the axial direction of the coil molded body having a reduced diameter, and the movement of the wire (18) arranged in the axial direction of the coil molded body is restricted by the abutting member. Align. Further, for example, insertion holes (26) penetrating in the thickness direction are formed at both ends in the longitudinal direction of the contact member, and a connecting member is attached to the insertion hole. The connecting member is detachably connected to both ends of the coil molded body by being inserted through, for example, the insertion hole of the contact member and the insertion hole (20) of the coil molded body. In this way, each end of the coil molded body is fixed by the contact member so that it does not rotate in the restoring direction, and the wires aligned in the axial direction of the coil molded body are aligned by the movement of the contact member being restricted. As a result, the coil molded body is held in a reduced diameter state.

  According to the seventh invention, by using this reduced diameter coil molded body, it is possible to realize simplification and efficiency of the lining method for forming the rehabilitation pipe line.

  According to the present invention, the coil molded bodies to which the holding tool is attached and the reduced diameter state are arranged side by side in the existing pipe, and the holder is sequentially removed from the coil molded body in the existing pipe so that the original diameter is restored. Therefore, the work of laying the coil molded body in the existing pipe can be performed more easily, and as a result, the workability of the lining method for forming the rehabilitation pipe line can be improved.

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

It is an illustration figure which shows a mode that a coil molded object is laid in the existing pipe | tube using the coil molded object holder of one Example of this invention. It is sectional drawing which shows a mode that the rehabilitation pipe line was formed in the existing pipe | tube by the lining construction method used as the background of this invention. It is a top view which shows a coil molded object. It is an illustration figure which shows a mode that the coil molded object of FIG. 3 was inserted in the existing pipe | tube. (A) is a top view which shows a lining material, (b) is sectional drawing of the lining material of (a). It is an illustration figure which shows a coil molded object holder. (A) is a front view which shows a mode that the coil molded object holder of FIG. 6 was attached to the coil molded object, (b) is sectional drawing of the axial direction of the coil molded object of (a). It is an illustration figure which shows a mode that a coil molded object is laid in the existing pipe | tube using a coil molded object holder. It is an illustration figure which shows a mode that a coil molded object is laid in an existing pipe using a coil molded object holder following FIG. It is an illustration figure which shows a mode that a coil molded object holder is removed from a coil molded object. It is an illustration figure which shows a mode that a coil molded object is laid in an existing pipe using a coil molded object holder following FIG. It is an illustration figure which shows a mode that the coil molded object was laid in the existing pipe | tube. (A) is a front view which shows a mode that the coil molded object holder of other one Example of this invention was attached to the coil molded object, (b) is an axial direction of the coil molded object of (a). It is sectional drawing. (A) is a front view which shows a mode that the coil molded object holder of another one Example of this invention was attached to the coil molded object, (b) is an axial direction of the coil molded object of (a). FIG. (A) is a front view which shows a mode that the coil molded object holder of another one Example of this invention was attached to the coil molded object, (b) is an axial direction of the coil molded object of (a). FIG. It is an illustration figure which shows a mode that the coil molded object holder of FIG. 15 is removed from a coil molded object.

  1 and 2, a coil molded body holder 10 according to an embodiment of the present invention is used in a lining method for forming a rehabilitated pipe line (lining pipe) 12 in an aged existing pipe 100. Is. In this lining method, as will be described in detail later, first, the coil molded body 14 to which the coil molded body holder 10 is attached and the diameter-reduced state is held is laid in the existing pipe 100, and the coil molded body 14 is attached. The reduced diameter state is restored in the existing pipe 100, and then the rehabilitated pipe line 12 is formed by the lining material 16 inserted into the coil molded body 14.

  Various applications and constituent materials of the existing pipe 200 can be applied. For example, the pipe 200 may be used for water and sewage, gas, communication cable protection, power cable protection, and the like. It may be a pipe constituted by a synthetic resin pipe such as a pipe, a cast iron pipe, a steel pipe, and a vinyl chloride pipe.

  Here, prior to specific description of the coil molded body holder 10, an outline of the coil molded body 14 and the lining material 16 used in the lining method will be described.

  As shown in FIG. 3, the coil molded body 14 is made of a material having sufficient rigidity, for example, a metal such as an aluminum alloy, steel or stainless steel, a synthetic resin, GFRP (glass fiber reinforced plastic), or CFRP (carbon fiber reinforced plastic). ) Is used as a material, and in this embodiment, GFRP is used as the material of the coil molded body 14.

  The coil molded body 14 is formed in a cylindrical shape by winding a rectangular wire 18 having a horizontally long cross section around a winding core (not shown). However, the molding method of the coil molded body 14 is not particularly limited, and the coil molded body 14 may be formed by spirally cutting a fiber-reinforced plastic tube, or a resin or the like may be formed in a dedicated mold. You may make it shape | mold by pouring. The nominal diameter of the coil molded body 14 is set to a size substantially equal to the inner diameter of the existing pipe 100, for example, 300 to 700 mm, and the axial length thereof is 300 to 700 mm.

  When the coil molded body 14 is rotated in the winding direction or pulled in the extending direction due to its shape characteristics, the diameter of the coil molded body 14 is reduced according to the rotational force or the tensile force. Further, the coil molded body 14 is flexible, and when inserted into the existing pipe 100, as shown in FIG. 4, not only the straight pipe portion 100a piped in a straight line but also a step is formed. It is possible to smoothly follow the stepped portion 100b and the like.

  As will be described in detail later, when the lining method is applied, insertion holes 20 that penetrate the wire 18 in the thickness direction are drilled (formed) at predetermined positions on both ends of the coil molded body 14 in the axial direction.

  As shown in FIG. 5, the lining material 16 is a reduced diameter tube having a substantially heart shape in cross section in which a part in the circumferential direction is pushed by a reduced diameter process. The constituent material of the lining material 16 is a synthetic resin (polyethylene, polybutene, polypropylene, nylon, vinyl chloride, etc.) or fiber reinforced plastic. Here, an example of polyethylene is shown.

  The lining material 16 is restored to a cylindrical shape by being heated to a predetermined temperature and pressurized, and is in close contact with the inner surface of the coil molded body 14 as will be described in detail later. ). The lining material 16 is set so that the outer diameter when restored is substantially the same as the inner diameter of the coil molded body 14.

  Since the lining material 16 can be manufactured by a conventionally known method (Patent Document 1, etc.), a detailed description of the manufacturing method is omitted, but simply speaking, the lining material 16 is directly extruded with a predetermined diameter. The tube is heated to a predetermined temperature in the range from the softening point to the melting point (in this embodiment, for example, about 100 ° C.) to form a substantially U-shaped indented portion using a push plate, a roller, or the like. Manufactured by doing. Therefore, the lining material 16 is again heated to a temperature not lower than the softening point and not higher than the melting point, and is pressed to return the indented portion to the outer surface side, so that the lining material 16 is restored to a predetermined shape (cylindrical shape or the like).

  The coil molded body 14 and the lining material 16 used for the lining method have been described above. In the following, examples and embodiments of the present invention will be described on the premise of these, and using them as necessary.

  As shown in FIGS. 6 and 7, the coil molded body holder 10 remains in a state where the diameter of the coil molded body 14 that has been reduced in diameter by applying a rotational force in the winding direction is reduced (in a reduced diameter state). An abutting member 22 provided on the inner surface side of the coil molded body 14 and a connecting member 24 for coupling the abutting member 22 to the coil molded body 14 are provided.

  The contact member 22 is formed in a rectangular flat plate shape with a metal such as iron or SUS, and circular insertion holes 26 penetrating the contact member 22 in the thickness direction are formed at both ends in the longitudinal direction. Yes. The abutting member 22 is attached (connected) to both ends of the coil molded body 14 whose diameter has been reduced by the connecting member 24 inserted through the insertion hole 26, and the inner surface along the axial direction of the coil molded body 14. It is provided in contact with the side.

  For example, in this embodiment, as can be seen from FIG. 7A, the contact member 22 is provided such that the central portion in the width direction is located at the top of the inner surface of the coil molded body 14. Are in contact with the inner surface side of the coil molded body 14 at a total of two points separated from each other by a distance of ½ of the length in the width direction. Thus, the contact member 22 is connected to both ends of the coil molded body 14 having a reduced diameter, and is in contact with each part of the inner surface of the wire 18 aligned in the axial direction of the coil molded body 14 in that state. The wire rods 18 arranged in the axial direction of the coil molded body 14 are aligned by the movement of the contact member 22 being restricted.

  The length in the longitudinal direction of the contact member 22 is set to be equal to the length in the axial direction of the coil molded body 14 having a reduced diameter, and is, for example, 400 mm to 600 mm. Moreover, the length of the width direction of the contact member 22 is 30 mm-50 mm, for example.

  The connecting member 24 is a general-purpose fixing pin made of a metal such as iron or SUS, and includes a columnar main body 24a and a head 24b in which one end of the main body 24 is expanded. The diameter of the main body 24a is set to be equal to the diameter of the insertion hole 26, and is 5 mm, for example. The connecting member 24 has an insertion hole 20 at each end of the coil molded body 14 and an insertion hole 26 of the contact member 22 such that the head 24b is inward (center side in the radial direction of the coil molded body 14). Is inserted. However, the connecting member 24 is only inserted into the insertion holes 20 and 26 of the coil molded body 14 and the abutting member 22, and is fixed to the insertion holes 20 and 26 by being screwed with a nut or screwed. In other words, the coil molded body 14 and the insertion holes 20 and 26 of the contact member 22 can be easily pulled out, that is, removed. That is, the connecting member 24 removably connects the contact member 22 to both end portions of the coil molded body 14 having a reduced diameter.

  Referring to FIGS. 7-12, the coil molded body 14 is laid in the existing pipe 100 using such a coil molded body holder 10, and the rehabilitated pipe is inserted by the lining material 16 inserted into the coil molded body 14. An example of the procedure of the lining method for forming the path 12 will be described.

  First, on the ground around the manhole 106 on the inlet 102 side, which is an end opening of the existing pipe 100, a coil molded body 14 having a reduced diameter state is prepared by the coil molded body holder 10.

  Specifically, when attaching the coil molded body holder 10 to the coil molded body 14, first, as shown in FIGS. 7A and 7B, first, the wire 18 is placed at predetermined positions on both ends of the coil molded body 14. A circular insertion hole 20 that penetrates through in the thickness direction is formed. The diameter of the insertion hole 20 is set to be equal to the diameter of the insertion hole 26 of the contact member 22. For example, the insertion holes 20 are drilled at both ends of the coil molded body 14 by a drill or the like, and when the diameter of the coil molded body 14 is reduced, each of the insertion holes 20 is on an axis parallel to the axis of the coil molded body 14. And at equal distances from the ends of the coil molded body 14 in the circumferential direction. However, the insertion hole 20 may be formed in advance when the coil molded body 14 is manufactured.

  Then, the diameter of the coil molded body 14 is reduced by applying a rotational force in the winding direction, and the contact member 22 is disposed so as to contact the inner surface along the axial direction of the coil molded body 14. The positions of the insertion holes 20 at each end of the molded body 14 and the insertion holes 26 at each end of the contact member 22 are aligned, and the connecting member 24 is attached to the insertion holes 20, 26. Then, each end of the coil molded body 14 is fixed by the abutting member 22 so as not to rotate in the restoring direction (that is, the direction opposite to the winding direction), and the wire 18 aligned in the axial direction of the coil molded body 14 is provided. Since the movement is restricted by the contact member 22, the coil molded body 14 is held in a reduced diameter state.

  Next, the coil molded body (reduced diameter coil molded body) 14 held in the reduced diameter state using the coil molded body holder 10 is carried into the manhole 106 and inverted before the entrance 102 (not shown). And the coil molded body 14 is pressed by the pressing means and pushed into (inserted into) the existing pipe 100.

  For example, in this embodiment, the hydraulic cylinder device 108 is used as the pressing means. The hydraulic cylinder device 108 accommodates a rod 110 that can be moved up and down (displaceable) by hydraulic pressure, and the tip of the rod 110 has a diameter that is the same as or slightly larger than that of the coil-formed body 14 with a reduced diameter. A disc-shaped pushing plate 112 is provided. Then, the pushing plate 112 is applied to the rear side of the coil molded body 14 installed in the invert of the manhole 106, and in this state, the hydraulic cylinder device 108 is operated to raise the rod 110, thereby pressing the coil molded body 14. The coil molded body 14 is pushed into the existing pipe 100 from the inlet 102. A stopper 114 is provided behind the hydraulic cylinder device 108 to prevent the hydraulic cylinder device 108 from moving (displacement) in the manhole 106 due to the reaction force. The coil molded body 14 pushed into the existing pipe 100 using the hydraulic cylinder device 108 is also prevented from exiting from the outlet 104 into the manhole 116 in the manhole 116 on the outlet 104 side which is the end opening of the cylinder. A stopper 118 is provided for this purpose. However, since known stoppers 114 and 118 can be used and are not the gist of the present invention, details are omitted here.

  Subsequently, when the coil molded body 14 pushed into the existing pipe 100 by the hydraulic cylinder device 108 moves forward from the inlet 102 by a certain distance (for example, about the length in the axial direction of the coil molded body 14), FIG. As shown in FIG. 3, the next coil molded body 14 is placed in the invert of the manhole 106 adjacent to the rear of the preceding coil molded body 14, and the preceding coil molded body 14 is pressed by the subsequent coil molded body 14. Then, as shown in FIG. 8B, the succeeding coil molded body 14 is pushed into the existing pipe 100 together with the preceding coil molded body 14. However, “front” in this embodiment means the insertion direction of the coil molded body 14, and “rear” means the opposite direction. The same applies hereinafter.

  Then, this is repeated until the leading coil molded body 14 reaches the outlet 104 (that is, until it comes into contact with the stopper 118), and the coil molded body 14 is sequentially pushed into the existing pipe 100 and laid, whereby FIG. As shown to a), the coil molded object 14 which attached the coil molded object holder 10 over the full length of the construction area, ie, the existing pipe | tube 100, and hold | maintained the diameter-reduced state is arranged in parallel.

  Next, as shown in FIG. 9B, the coil molded body holder 10 is removed from the leading coil molded body 14, that is, the coil molded body 14 located closest to the outlet 104 of the existing pipe 100, and the coil molded body. 14 is restored (restored) to the original diameter, that is, a diameter substantially equal to the inner diameter of the existing pipe 100.

  Specifically, first, as shown in FIG. 10A, the connecting member 24 is removed from the insertion hole 20 on the rear side (that is, the inlet 102 side) of the coil molded body 14 and the insertion hole 26 of the contact member 22. Thus, the connection between the rear side of the coil molded body 14 and the contact member 22 is released. Then, the rotational force applied to the rear side of the coil molded body 14 is released, and the portion excluding the front end portion of the coil molded body 14 returns to the original diameter. In addition, since the length of the coil molded body 14 is shortened in the axial direction by expanding the diameter of the rear side of the coil molded body 14, the rear end of the coil molded body 14 moves slightly forward, A gap is generated between the coil molded body 14 and the subsequent coil molded body 14. In addition, as a method of removing the connecting member 24 from the coil molded body 14 and the contact member 22, a method of removing the connecting robot 24 by remotely operating an in-pipe robot or a wire fastened to the head 24 b of the connecting member 24 is provided. An appropriate method such as a method of pulling the connecting member 24 by pulling from the manhole 106 on the inlet 102 side of the tube 100 can be used.

  Then, as shown in FIG. 10B, the connecting member 24 inserted through the insertion hole 20 on the front side (that is, the outlet 104 side) of the coil molded body 14 and the insertion hole 26 of the contact member 22 is removed, The entire coil compact 14 is returned to its original diameter.

  Next, the coil molded body holder 10 removed from the coil molded body 14 is collected. As a method of recovering the coil molded body holder 10, a method of recovering by remotely operating an in-pipe robot or the like, or a wire fastened to the contact member 22 or the connecting member 24 on the inlet 102 side of the existing pipe 100 is used. An appropriate method, such as a method of pulling from the manhole 106 or the like and collecting it, can be used. However, after all the coil molded bodies 14 laid in the existing pipe 100 are restored from the reduced diameter state, the coil molded body holders 10 may be collected together. In addition, the operator may collect it manually if it is near the inlet 102 or the outlet 104 of the existing pipe 100.

  Next, as shown in FIG. 11 (a), a new coil molded body 14 is installed in the invert of the manhole 106, and the coil molded body 14 is pressed against the coil molded body 14 by the hydraulic cylinder device 108, so that All the coil molded bodies 14 arranged in parallel on the side (that is, on the outlet 104 side) are advanced. However, the end portion on the most front side (that is, the inlet 102 side) of the coil molded bodies 14 arranged in parallel in the existing pipe 100 may be directly pressed by the hydraulic cylinder device 108.

  Then, as shown in FIG. 11 (b), the coil molded body 14 arranged in parallel in the existing pipe 100 moves forward, and the gap generated by restoring the leading coil molded body 14 is blocked. . At this time, as close as possible to the position of the rear end of the leading coil molded body 14 in which the coil molded body 14 arranged in parallel in the existing pipe 100 is returned to the original diameter while being appropriately checked with an in-tube camera or the like. In this manner, the gap is reduced between the coil molded bodies 14.

  The coil molded body holder 10 is removed from the coil molded body 14 in order from the coil molded body 14 positioned on the outlet 104 side of the existing pipe 100 to the coil molded body 14 positioned on the inlet 102 side. Each time the coil molded body holder 10 is removed from the molded body 14, the coil molded body 14 arranged in parallel in the existing pipe 100 is pressed from the inlet 102 side to the outlet 104 side of the existing pipe 100 to hold the coil molded body. The operation of filling the gap formed between the coil molded body 14 from which the tool 10 has been removed and the coil molded body 14 subsequent thereto is repeated.

  Thus, as shown in FIG. 12, when all of the coil molded body 14 laid in the existing pipe 100 is restored from the reduced diameter state, the lining material 16 is then placed inside the coil molded body 14 (continuous body thereof). insert.

  Specifically, although not shown, a pulling wire is inserted into the coil molded body 14 and the pulling wire is connected to the lining material 16 on the insertion port side of the existing pipe 100. Then, the pulling wire is wound up with a winch, and the lining material 16 is inserted until the tip of the lining material 16 reaches the outlet of the existing pipe 100.

  Next, after supplying steam or hot water into the lining material 16, the lining pipe 12 is formed in the coil molded body 14 by pressurizing to a predetermined pressure. Specifically, the lining material 16 is restored to a perfect circle or a substantially perfect circle that is sufficiently close to a true circle by being heated and applied with internal pressure. Then, the entire outer peripheral surface of the restored lining material 16 is brought into close contact with the entire inner surface of the coil molded body 14, and a lining pipe is formed over the entire length in the existing pipe 100.

  In this way, the rehabilitation pipe line 12 lining the inner surface of the existing pipe 100 is formed (see FIG. 2).

  As described above, in this embodiment, the coil molded body 14 whose diameter is reduced by the coil molded body holder 10 is arranged in parallel in the existing pipe 100, and the coil molded body 14 is changed from the coil molded body 14 in the existing pipe 100. The holders 10 are sequentially removed and restored to the original diameter.

  For this reason, for example, compared with the case where the coil molded body connected so as to extend over the entire length of the existing pipe is drawn into the existing pipe while reducing the diameter at the construction site, the diameter reduction work of the coil molded body at the construction site can be omitted. Further, since the coil molded body 14 to which the coil molded body holder 10 is attached is mechanically inserted into the existing pipe 100 and the connecting member 24 is simply removed therefrom, the coil molded body 14 is laid in the existing pipe 100. It is possible to simplify the work to do.

  In addition, since the reduced diameter state of the coil molded body 14 can be maintained simply by attaching the coil molded body holder 10 having a simple mechanism to the coil molded body 14 having a reduced diameter, the skill (skill) of the operator can be maintained. There is no need to rely on it.

  Therefore, according to this embodiment, simplification and efficiency of the lining method for forming the rehabilitation pipe line 12 in the existing pipe 100 can be realized.

  Further, in this embodiment, after the coil molded body holder 10 is removed from the coil molded body 14 and before the coil molded body holder 10 is removed from the next coil molded body adjacent to the coil molded body holder 10, it is arranged in parallel in the existing pipe 100. The coil formed body 14 is pushed from the inlet 102 side to the outlet 104 side of the existing pipe 100 to thereby restore the coil formed body 14, that is, the coil formed with the coil molded body holder 10 removed. A gap formed between the body 14 and the next coil forming body 14 adjacent thereto is filled. By doing so, when all of the coil molded bodies 14 laid in the existing pipe 100 are restored from the reduced diameter state, no gaps are formed between the coil molded bodies 14 or the coil molded bodies 14 become extremely small. By 14, it becomes possible to ensure a reliable external pressure strength.

  Furthermore, the same equipment as that used when the coil molded body 14 is pushed into the existing pipe 100 (in this embodiment, the hydraulic cylinder device 108) is used to close the intervals generated by restoring the coil molded body 14. Therefore, it is possible to reduce the construction cost.

  In the above-described embodiment, the coil molded body 14 in which the rectangular wire 18 having a horizontally long cross section is wound is used. However, the present invention is not limited to this, and the wire rod having a substantially circular cross section or a cross section may be used. You may make it utilize the coil molded object which wound the wire which has semicircle shape, and the wire which has a cross-section horseshoe shape. In short, it is possible to use a coil molded body in which a wire having an arbitrary cross-sectional shape is wound without departing from the gist of the present invention, and the width of the wire of the coil molded body is set to be large. For example, since the number of times of winding the wire is reduced by that amount, the workability when manufacturing the coil molded body is improved, and if the thickness of the wire of the coil molded body is set to be large, that much. The resistance against external pressure of the coil molded body is improved.

  Furthermore, in the above-described embodiment, the nominal diameter of the coil molded body 14 is set to be approximately equal to the inner diameter of the existing pipe 100, but it is not necessary to be limited to this. For example, the nominal diameter of the coil molded body 14 may be set smaller than the inner diameter of the existing pipe 100. In this case, when the coil molded body 14 is restored, the inner diameter of the coil molded body 14 is expanded by applying an internal pressure to the coil molded body 14 by the lining material 16 so as to be in close contact with the entire inner surface of the existing pipe 100. .

  Further, the nominal diameter of the coil molded body 14 may be set slightly larger than the inner diameter of the existing pipe 100. In this case, since the coil molded body 14 that has returned to its original diameter by being released from the rotational force is in close contact with the inner surface of the existing pipe 100, the cross-sectional reduction of the rehabilitating pipe line 10 can be further reduced. .

  Furthermore, in the above-described embodiment, every time the coil molded body holder 10 is removed from the coil molded body 14, the coil molded body 14 arranged in parallel in the existing pipe 100 is connected to the inlet of the existing pipe 100 by the hydraulic cylinder device 108. The gap formed between the coil molded body 14 from which the coil molded body holder 10 is removed by pressing from the 102 side to the outlet 104 side and the coil molded body 14 subsequent thereto are filled, but the present invention is not limited to this. The gap formed between the coil molded bodies 14 may be packed together after removing the coil molded body holder 10 from the two or more coil molded bodies 14.

  Further, it is not always necessary to press the coil molded body 14 into the existing pipe 100 by pressing with the hydraulic cylinder device 108 or to close a gap generated between the coil molded bodies 14. Appropriate pressing means and pulling means can be used without departing from the scope of the present invention.

  Furthermore, in each of the above-described embodiments, the connecting member 24 uses a fixing pin having a cylindrical main body 24a and a head 24b so that the head 24b is inward. Although inserted through the insertion hole 26 of the contact member 22 and the insertion hole 20 of the coil molded body 14, there is no need to be limited to this, and the contact member 22 is removed to the inner surface side of each end of the coil molded body 14. As long as it can be connected, a connecting member having an appropriate shape / mechanism can be employed.

  Furthermore, in the above-described embodiment, the contact member 22 formed in the shape of a rectangular flat plate is provided on the top of the inner surface of the coil molded body 14 and connected to both ends of the coil molded body 14 by the connecting member 24. It is not necessary to be limited to this, and the number and arrangement position of the contact members 22 can be appropriately changed according to the length and diameter of the coil molded body 14.

  For example, a coil molded body holder 10 which is another embodiment of the present invention shown in FIG. 13 includes two abutting members 22. Hereinafter, the same reference numerals are used for the same parts as the coil molded body holder 10 shown in FIG. 7, and the description thereof is omitted or simplified.

  As shown in FIGS. 13A and 13B, the two contact members 22 are opposed to each other on the inner surface side of the coil molded body 14 whose diameter has been reduced, in this embodiment, the inner surface side of the coil molded body 14. Are respectively disposed at the top and bottom of each.

  Each abutting member 22 is connected to both ends of the coil molded body 14 having a reduced diameter by a connecting member 24 inserted through the insertion hole 26 and is provided so as to contact the inner surface side along the axial direction of the coil molded body 14. It is done. For example, in this embodiment, as can be seen from FIG. 13A, the two abutting members 22 are provided such that the center in the width direction is located at the top or bottom of the inner surface of the coil molded body 14, respectively. The coil molded body 14 is in contact with the inner surface of the coil molded body 14 at a total of four points separated from the top or bottom by a distance of half the length in the width direction. Thus, the contact member 22 is connected to both ends of the coil molded body 14 having a reduced diameter, and is in contact with each part of the inner surface of the wire 18 aligned in the axial direction of the coil molded body 14 in that state. The wire rods 18 arranged in the axial direction of the coil molded body 14 are aligned by the movement of the contact member 22 being restricted.

  As in this embodiment, by providing the two contact members 22 at positions facing the inner surface of the coil molded body 14, the reduced diameter state of the coil molded body 14 can be held more stably. .

  Furthermore, the contact member 22 is not necessarily formed in a flat plate shape, and can be fixed by the contact member 22 so that each end portion of the coil molded body 14 does not rotate in the restoring direction, and the axial direction of the coil molded body 14 As long as the wires 18 arranged in a line can be aligned by the movement of the contact member 22 being restricted, an appropriate shape can be adopted for the contact member 22.

  For example, the contact member 22 may be formed in a curved plate shape along the inner diameter of the coil molded body 14 having a reduced diameter.

  Further, for example, a coil molded body holder 10 which is another embodiment of the present invention shown in FIG. 14 includes a circular tube-shaped contact member 22. Hereinafter, the same reference numerals are used for the same parts as the coil molded body holder 10 shown in FIG. 7, and the description thereof is omitted or simplified.

  As shown in FIGS. 14A and 14B, the abutting member 22 is formed into a circular tube having both ends open, that is, a pipe shape, using a metal such as iron or SUS or a synthetic resin. Insertion holes 26 are formed at both ends in the axial direction of the contact member 22, and the contact members 22 are both ends of the coil molded body 14 whose diameter is reduced by the connecting member 24 inserted through the insertion hole 26. Connected to the part. For example, in this embodiment, the outer diameter of the contact member 22 is set to be equal to the inner diameter of the reduced coil formed body 14, and the contact member 22 is the inner surface of the reduced coil formed body 14. It is provided so that it may touch the whole. Thus, the contact member 22 is connected to both ends of the coil molded body 14 having a reduced diameter, and is in contact with the entire inner surface of the wire 18 aligned in the axial direction of the coil molded body 14. The wires 18 arranged in the axial direction of the molded body 14 are aligned by the movement of the contact member 22 being restricted.

  As in this embodiment, the reduced diameter state of the coil molded body 14 can be more stably maintained by using the cylindrical contact member 22 that contacts the entire inner surface of the coil molded body 14.

  Further, in the coil molded body holder 10 which is another embodiment of the present invention shown in FIGS. 15 and 16, a removing means for removing the connecting member 24 from the contact member 22 is provided. Hereinafter, the same reference numerals are used for the same parts as the coil molded body holder 10 shown in FIG. 7, and the description thereof is omitted or simplified.

  As shown in FIGS. 15A and 15B, the contact member 22 is formed in a rectangular flat plate shape by a metal such as iron or SUS, and insertion holes 26 are formed at both ends in the longitudinal direction. Is done. The contact member 22 is connected to each end portion of the coil molded body 14 whose diameter has been reduced by the connecting member 24 inserted through the insertion hole 26, and contacts the inner surface side along the axial direction of the coil molded body 14. Is provided. For example, in this embodiment, as can be seen from FIG. 15A, the contact member 22 is provided such that the central portion in the width direction is located at the top of the inner surface of the coil molded body 14. Are in contact with the inner surface side of the coil molded body 14 at a total of two points separated from each other by a distance of ½ of the length in the width direction. Thus, the contact member 22 is connected to both ends of the coil molded body 14 having a reduced diameter, and is in contact with each part of the inner surface of the wire 18 aligned in the axial direction of the coil molded body 14 in that state. The wire rods 18 arranged in the axial direction of the coil molded body 14 are aligned by the movement of the contact member 22 being restricted.

  Furthermore, a removing means for removing the connecting member 24 is provided on the lower surface of the contact member 22 (that is, the surface on the center side of the coil molded body 14). One detaching means is arranged for one connecting member 24 (insertion hole 26). That is, in this embodiment, a detaching means is provided at each of both ends in the longitudinal direction of the contact member 22, and each detaching means has a plate member 28 and a wire insertion member 30.

  The plate member 28 is made of a metal such as iron or SUS or a synthetic resin, and is formed in a rectangular flat plate shape that is long in the vertical direction and short in the horizontal direction. The plate member 28 is provided on the inner side (longitudinal direction center side) of the contact member 22 so as to be orthogonal to the contact member 22, and below the wire member 30 is provided.

  The wire insertion member 30 is a part through which a wire 34 for removing the connecting member 24 is inserted during construction, and is formed into a circular tube having both ends open, that is, a pipe shape, by a metal such as iron or SUS or a synthetic resin. The wire insertion member 30 extends in the same direction as the longitudinal direction of the contact member 22 and is provided so as to protrude from the lower side of the plate member 28 to the outside (longitudinal end portion side) of the contact member 22. In addition, a circular through hole 32 that penetrates the peripheral wall in the thickness direction is formed in an upper portion of the wire insertion member 30, that is, a portion facing the contact member 22. The through hole 32 is disposed at a predetermined position between the opening on the outside of the contact member 22 of the wire insertion member 30 and the plate member 28.

  The procedure of the lining construction method in which the coil molded body 14 is laid in the existing pipe 100 using such a coil molded body holder 10 and the rehabilitating pipeline 12 is formed by the lining material 16 inserted into the coil molded body 14. An example will be described.

  First, in the same manner as described above, the coil molded body 14 to which the coil molded body holder 10 is attached and the diameter-reduced state is maintained is prepared and carried into the manhole 106.

  Next, a wire is attached to the wire insertion member 30 and the connecting member 24 of the coil molded body holder 10 attached to each coil molded body 14.

  At this time, actually, a wire is separately attached to each of the two wire insertion members 30 of the coil molded body holder 10, but in order to simplify the drawing, in FIG. Only the wire 34 attached to the wire insertion member 30 provided on the rear side (that is, the inlet 102 side) is illustrated, and the wire attached to the wire insertion member 30 provided on the front side (that is, the outlet 104 side). Are the same and are not shown.

  Specifically, as shown in FIG. 16A, the wire 34 having one end disposed in the manhole 116 on the outlet 104 side of the existing pipe 100 is inserted into the wire insertion member 30 from the inner opening, and penetrated. The wire 32 comes out of the hole 32 to the top of the wire insertion member 30 and is fastened to the connecting member 24. Then, after the wire 34 is fastened to the connecting member 24, the wire 34 is returned to the inside of the wire insertion member 30 from the through hole 32, and is taken out from the opening outside the wire insertion member 30 to the rear side of the wire insertion member 30. Then, the wire 34 extended from there toward the rear side of the coil molded body 14 is mounted on the wire insertion member 30 of the coil molded body holder 10 attached to the subsequent coil molded body 14 in the same manner as described above. .

  The wire 34 extending rearward from the coil molded body holder 10 attached to the preceding coil molded body 14 is sequentially attached to the coil molded body holder 10 attached to the subsequent coil molded body 14 while the wire 34 is attached. The coil molded body 14 equipped with 34 is sequentially pushed into the existing pipe 100 by pressing means such as the hydraulic cylinder device 108. As a result, the coil molded bodies 14 in which the wires 34 are attached to the respective coil molded body holders 10 (the wire insertion member 30 and the connecting member 24 thereof) are juxtaposed along the entire length of the existing pipe 100.

  Next, the coil molded body holder 10 is removed from the leading coil molded body 14, that is, the coil molded body 14 located closest to the outlet 104 of the existing pipe 100, and the coil molded body 14 is returned to its original diameter (restored). .

  Specifically, first, one end of the wire 34 arranged in the manhole 116 on the outlet 104 side of the existing pipe 100 is pulled while fixing the other end in the manhole 106 on the inlet 102 side of the existing pipe 100. 16 (b), the connecting member 24 inserted through the insertion hole 20 on the rear side (that is, the inlet 102 side) of the leading coil molded body 14 and the insertion hole 26 of the contact member 22 is removed. Then, the portion excluding the front end portion of the coil molded body 14 is returned to the original diameter.

  Then, although not shown in the drawing, the wire arranged in the manhole 116 on the outlet 104 side of the existing pipe 100 while fixing the other end in the manhole 106 on the inlet 102 side of the existing pipe 100 in the same manner. The connecting member 24 inserted through the insertion hole 20 on the front side (that is, the outlet 104 side) of the leading coil molded body 14 and the insertion hole 26 of the contact member 22 is removed by pulling one end of the coil molded body. 14 is restored to its original diameter.

  Subsequently, in the same manner as described above, the coil molded body 14 is newly installed in the invert of the manhole 106, and the coil molded body 14 is pressed against the coil molded body 14 by the hydraulic cylinder device 108, and is then arranged in parallel to the outlet 104 side. By moving forward all the coil molded bodies 14 provided, the gap generated by restoring the leading coil molded body 14 is closed.

  The coil molded body holder 10 is removed from the coil molded body 14 in order from the coil molded body 14 positioned on the outlet 104 side of the existing pipe 100 to the coil molded body 14 positioned on the inlet 102 side. 14 is repeated to close the gap generated by restoring 14.

  In this way, when all the coil molded bodies 14 laid in the existing pipe 100 are restored from the reduced diameter state, the other end of the wire 34 fixed in the manhole 106 on the inlet 102 side of the existing pipe 100 is then released. Then, by pulling one end of the wire 34 disposed in the manhole 116 on the outlet 104 side of the existing pipe 100, the coil molded body holder 10 removed from the coil molded body 14 is collected together with the wire 34. At this time, as can be seen from FIG. 16B, the through hole 32 of the wire insertion member 30 is sized and shaped so that the head portion 24 of the connecting member 24 cannot be inserted, and is removed from the insertion holes 20 and 26. By locking the connected member 24 at the portion of the through hole 32, in addition to the connected member 24, other coil molded body holders 10 can be collected together with the wire 34. However, the coil molded body holder 10 removed from the coil molded body 14 may be recovered by remotely operating the in-pipe robot or the like.

  Then, the lining material 16 is inserted into the coil molded body 14 (continuous body), and a lining pipe is formed over the entire length in the existing pipe 100 in the same manner as described above.

  As in this embodiment, the coil molded body holder 10 is provided with a detaching means for detaching the connecting member 24, so that the connecting member 24 needs to be removed or recovered by remote operation, for example, by an in-pipe robot. Therefore, workability can be further improved.

  In each of the above-described embodiments, the rehabilitation pipe line 10 is formed in the existing pipe 100 over the entire length thereof. However, the present invention is not limited to this, and the existing pipe 100 is partially formed by the lining method of the present invention. Rehabilitation (repair, reconstruction) may be performed. That is, when the rehabilitation pipe line 12 is formed over the entire length of the existing pipe 100, the construction section of the lining method is the existing pipe 100, and the coil molded bodies 14 need to be arranged side by side so as to extend over the entire length of the existing pipe 100. However, when the existing pipe 100 is partially rehabilitated, the rehabilitated part becomes a construction section of the lining method, and the coil molded bodies 14 may be arranged in parallel so as to cover at least the whole rehabilitated part. .

  In each of the above-described embodiments, the lining material 16 is a reduced diameter tube in which a part of the circumferential direction is pushed in or is folded and flattened by a diameter reduction process, but is not limited thereto. It is not necessary to use a straight pipe having a substantially circular cross section, and a reduced diameter pipe having a reduced diameter as it is may be used.

  Furthermore, the lining pipe does not necessarily need to be restored so that the reduced diameter pipe is substantially in close contact with the inner surface of the coil molded body 14. After the coil molded body 14 is laid in the existing pipe 100 using the coil molded body laying apparatus 10, a lining pipe in which a long strip-shaped member is spirally wound, or a plate-shaped member in the circumferential direction or the longitudinal direction. Various lining pipes such as an attached lining pipe can be applied, and further, a lining pipe other than a resin material may be applied.

  Furthermore, the specific numerical values such as the dimensions mentioned above are merely examples, and can be appropriately changed according to the needs of the product specifications and the like.

DESCRIPTION OF SYMBOLS 10 ... Coil molded object holder 12 ... Rehabilitation pipe line 14 ... Coil molded object 16 ... Lining material 22 ... Contact member 24 ... Connection member 100 ... Existing pipe

Claims (7)

A lining method in which a coil molded body is laid in an existing pipe having an inlet and an outlet, and a lining pipe is formed by a lining material in the coil molded body,
(A) A plurality of coil compacts that have been reduced in diameter by attaching a holder are sequentially inserted from the inlet and disposed in the existing pipe over the entire length of the existing pipe from the inlet to the outlet. Step,
(B) removing the holder of the coil molded body holding the reduced diameter state located at the most outlet side of the existing pipe, and restoring the coil molded body from the reduced diameter state; and after removal of the retainer in the coils formed body c) the step (b), before removing the retainer from the coil molded product that retains the state of being reduced in diameter adjacent thereto, the state of being restored the A step of closing the interval generated by restoring the coil molded body by moving the coil molded body holding the reduced diameter state located on the inlet side from the coil molded body to the outlet side ;
Repeat the previous SL step (b) and (c), it is recovered from the state of being contracted all coil molded body disposed in the existing pipe, further
(D) A lining method comprising a step of forming a lining pipe with a lining material laid in the coil molded body. In the step (c), the coil formed body that holds the reduced diameter position positioned closest to the inlet side is pressed by the pressing means installed in the inlet side manhole of the existing pipe, and all of the coil molded bodies positioned on the outlet side from that are pressed. The lining method according to claim 1, wherein the interval formed by moving the coil molded body holding the reduced diameter of the coil toward the outlet side and restoring the coil molded body is reduced. In the step (c), a coil molded body holding a new reduced diameter state is disposed in the inlet-side manhole, and the new coil molded body is pressed by the pressing means so that it is closer to the outlet side. The lining method according to claim 2, wherein all the coil formed bodies that have been kept in a reduced diameter state are moved to the outlet side. In the step (a), a stopper is installed in the outlet side manhole of the existing pipe to prevent the coil molded body that has been inserted into the existing pipe and kept in a reduced diameter state from coming into the outlet side manhole. The lining method according to any one of claims 1 to 3, wherein a coil molded body holding the reduced diameter state is sequentially inserted into the existing pipe. (E) Before the step (d) , the method further comprises a step of recovering the holder removed from the coil molded body in the step (b) to the outside of the existing pipe . lining method as claimed in. A lining method in which a coil molded body is laid in an existing pipe, and a lining pipe is formed with a lining material in the coil molded body,
(A) a step of laying a plurality of coil molded bodies in a state where the diameter is reduced by attaching a holding tool to which a wire is attached;
(B) The holder is removed from the coil molded body by pulling the wire in order from the coil molded body located on the farthest side of the existing pipe to the coil molded body located on the foremost side. Restoring the body from a reduced diameter, and
(C) A coil molded body laid in the existing pipe after removing the holder from at least one coil molded body in step (b) and before removing the holder from the next coil molded body adjacent thereto. Pressing from the near side of the existing pipe to the back side, and the step of closing the interval generated by restoring the coil molded body,
Steps (b) and (c) are repeated to restore all of the coil molded bodies laid in the existing pipe from a reduced diameter state,
(D) comprises the step of forming a lining pipe by lining material which is laid on the coil forming body, La innings method. A reduced-diameter coil molded body used in the lining method according to any one of claims 1 to 6 ,
A coil molded body reduced in diameter by applying a rotational force in the winding direction;
A contact member that is provided so as to be in contact with the inner surface side of the coil molded body and aligns wires arranged in the axial direction of the coil molded body, and both ends of the coil molded body and the contact member are detachably connected. A reduced-diameter coil molded body comprising a connecting member to be used.

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