JP5101937B2 - Pipeline lining structure - Google Patents

Description

  The present invention relates to a pipeline lining structure for reinforcing a pipeline, and more particularly to a pipeline lining structure suitable for covering the inner surface of a pipeline to repair an existing pipeline having a large diameter.

  As a technique for reinforcing existing pipes such as aging water pipes, sewer pipes, or agricultural water pipes, various techniques for covering the entire inner surface of the pipes with a reinforcing material have been proposed. For example, the inventors of the present invention have proposed a repair technique (Patent Document 1) suitable for repairing a large-diameter pipe that can be operated by a person entering the pipeline as shown below.

  2. Description of the Related Art Conventionally, a pipeline lining structure suitable for coating the inner surface of a large-diameter pipeline is known (see, for example, Patent Document 1). The pipeline lining structure described in Patent Document 1 has an inner member having a longitudinal direction attached to a hollow frame-shaped reinforcing material arranged along an inner surface of an existing pipeline, and the attached inner members are connected to each other in the longitudinal direction. It is a technique characterized by connecting with an inner surface member connecting material disposed across both inner surface members in a state where the direction end surfaces are in contact with each other. The two inner surface members are connected by inserting approximately half of the length of the inner surface member connecting material inside one inner surface member and the other half inside the other inner surface member.

  Also known is a lining method in which an existing pipe line is rehabilitated by lining a strip with a rib on the inner surface of the pipe line (for example, see Patent Document 2). The lining method described in Patent Document 2 uses a connecting member having two rib surfaces opposed to each other and a flat surface between the two rib surfaces, and three connecting surfaces each in surface contact with the flat surface between the two rib surfaces. This is a technique characterized by connecting strips.

JP 2002-310378 A JP-A-7-4582

  However, in the pipeline lining structure described in Patent Document 1, it is relatively easy to insert the inner surface member connecting material into the inner surface member. However, in order to further stabilize the connection between the inner surface members, In order to connect the end butting surfaces of the members so as to be positioned substantially at the center of the inner surface member connecting material, it takes time to adjust the position. Specifically, about half of the inner surface member connecting material is inserted inside one inner surface member, and then, when the other inner surface member to be abutted is inserted into the remaining half of the inner surface member connecting material, the inner surface member connecting material is There were times when it shifted slightly in the longitudinal direction. Further, when the inner surface member once connected is assembled to the reinforcing member disposed on the inner surface of the pipe line, the butted portion between the inner surface members may be slightly separated.

  Further, in the lining method described in Patent Document 2, since the corners at both ends in the longitudinal direction of the connecting member are chamfered, it is relatively easy to insert the connecting member into the ribbed strip. Is fixed to the ribbed member by bonding or screwing. In other words, the connection member cannot be reliably fixed unless the connection member is bonded or screwed to the ribbed member. However, in the repair work of the existing pipe inner surface, which generally has a large construction area, the bonding work and the screwing work are laborious work.

  The present invention has been made in view of the above circumstances, and an object thereof is to connect the inner surface members attached to the pipe reinforcement disposed along the inner face of the pipe efficiently and easily. It is an object of the present invention to provide a lining structure for a pipeline that enables the above.

Means and effects for solving the problems

  The pipeline lining structure according to the present invention relates to a pipeline lining structure for reinforcing a pipeline. And the lining structure of the pipe line concerning the present invention has the following some features in order to achieve the above-mentioned object. That is, the lining structure of the pipeline of the present invention has the following features alone or in combination as appropriate.

In order to achieve the above object, the first feature of the pipeline lining structure according to the present invention is attached to the inner peripheral side of the pipeline reinforcement disposed along the pipeline inner surface, along the longitudinal direction. includes an inner surface member having a concave insertion member that is formed continuously, and the inner surface member connecting member having a convex curved portion that is inserted into the concave insertion member is formed along the longitudinal direction, the convex convex height of the bend is higher from the longitudinal both end portions of the convex bent portion increases toward the longitudinal center portion, has a maximum in the longitudinally central portion of the convex bent portion, the said concave The dimension in the concave portion of the insertion portion is a uniform size along the longitudinal direction of the concave insertion portion, and is larger than the height of the convex portion at both ends in the longitudinal direction of the convex bent portion. The protrusion at the central portion in the longitudinal direction of the bent portion Is smaller than the height, and inserting the convex curved portion on the concave insertion member causes closely fitted and the concave insertion member and the convex bent portion at a position where the protrusion height is maximum That is.

According to this configuration, the frictional force between the inner surface member and the inner surface member coupling material can be increased at the predetermined position where the convex height of the convex bent portion of the inner surface member coupling material is maximized. The member connecting material can be strongly connected to each other. On the other hand, in the portion other than the predetermined position, it is relatively easy to insert the inner surface member connecting material into the inner surface member. Therefore, it becomes possible to connect the inner surface members attached to the pipe line reinforcing material disposed along the inner surface of the pipe line efficiently and reliably through the inner surface member connecting material.
Moreover, since the convex part height of a convex bending part becomes the largest in a longitudinal direction center part, the frictional force in the longitudinal direction center part of an inner surface member connection material becomes large, and the inner surface member inserted from the both ends of the inner surface member connection material The end portion of the inner surface contacts with the center portion in the longitudinal direction of the inner surface member connecting material. Therefore, even if the position adjustment in the longitudinal direction of the inner surface member connecting material is not particularly performed, the inner surface member automatically abuts at the center of the inner surface member connecting material, and the inner surface members are more easily connected without being easily displaced. To do.
In addition, since the size of the concave portion of the inner surface member is smaller than the maximum convex portion height of the convex bent portion, when the inner surface member connecting material is inserted into the inner surface member, the convex bent portion at the central portion in the longitudinal direction of the inner surface member connecting material. And the concave insertion portion of the inner surface member are pressed against each other, and a larger frictional force is exerted between the inner surface member and the inner surface member connecting material, so that the inner surface member once connected by the inner surface member connecting material is easily detached. There is nothing.

The second feature of the pipeline lining structure according to the present invention is that the convex bent portion has the maximum height of the convex portion at the central portion in the longitudinal direction along the longitudinal direction of the convex bent portion. It is formed so as to continue for a predetermined length at a height.

  According to this configuration, a wide contact area between the concave insertion portion and the convex bent portion can be secured, and the holding force due to friction between the inner surface member and the inner surface member connecting material can be increased.

The 3rd characteristic in the lining structure of the pipe line which concerns on this invention is that the said inner surface member is orthogonal to the longitudinal direction of the said side wall part which covers the said pipe line inner surface along the longitudinal direction of the said pipe line, and the said side wall part. And the inner surface member connecting material has a U-shaped cross-section in a direction perpendicular to the longitudinal direction of the inner surface member connecting material. The convex bent portions are provided at both end portions in a direction orthogonal to the longitudinal direction of the member connecting material, and the side wall portions are directed from both end portions in the direction orthogonal to the longitudinal direction of the side wall portions toward the central portion of the side wall portions. as the Hare whether it is inclined to bow in hand the concave insertion member side.

According to this configuration, since the cross-sectional shape of the inner surface member is an arcuate shape, when the inner surface member connecting material is inserted into the inner surface member, the central portion curved in the arc shape of the inner surface member is pressed against the inner surface member connecting material. Thus, the holding force due to friction between the inner surface member and the inner surface member connecting material is further increased.
Moreover, since the inner surface member and the inner surface member connecting material are fixed at both ends in the direction orthogonal to the longitudinal direction, that is, two opposing connecting portions composed of the concave insertion portion and the convex bent portion, the inner surface member And the inner surface member connecting material can be further strongly connected.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The pipeline lining structure according to the present invention is a pipeline lining structure suitable for covering and reinforcing the inner surface of an existing pipeline such as an aged water pipe, sewer pipe, or agricultural water pipe. However, it is a technique that can be applied to the inner surface coating (secondary lining) of these newly installed pipes.

  FIG. 1 is a structural explanatory view for showing an embodiment of a pipeline lining structure according to the present invention. The existing pipeline P is cut along a vertical section along its longitudinal direction, and the lining structure is shown. It is a figure which cuts and shows the upper half in the same vertical cross section. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is an enlarged view of a portion B in FIG. Furthermore, FIG. 4 is a cross-sectional view along the longitudinal direction of the existing pipeline, showing a state in which only the pipeline reinforcement is disposed along the inner surface of the existing pipeline for explaining the pipeline reinforcement. .

  As shown in FIG. 1 to FIG. 3, a hollow frame-shaped pipe reinforcing material 1 is disposed in an existing pipe P, and an inner surface member 2 is attached to the inside via a fitting member 4. Thus, a cylindrical lining material is formed along the inner surface of the existing pipe P as a whole.

  The detailed structure of the pipe reinforcing member 1 is omitted in FIGS. 1 and 2, but FIG. 3 is an enlarged view of a portion B in FIG. 3, and only the pipe reinforcing member 1 is the inner surface of the existing pipe P in FIG. In this embodiment, a plurality of ring-shaped reinforcing members 11 along the inner surface of the existing pipeline P are joined in the longitudinal direction of the existing pipeline P by the connecting member 12. A plurality of fitting portions 11 a for fitting the fitting member 4 are formed at equal intervals in the circumferential direction on the inner peripheral side of the ring-shaped reinforcing member 11. The connecting member 12 is arranged between the ring-shaped reinforcing members 11 adjacent to each other in the longitudinal direction of the existing pipe line P and serves as a spacer, and a connecting bolt 12a having male threads formed at least at both ends, The nut 12b is screwed into each male screw. Then, the connecting ring bolts 12a are inserted into the pipe member 12c interposed between the adjacent ring-shaped reinforcing members 11, and the nuts 12b are screwed into the male screw portions at both ends thereof, thereby connecting the adjacent ring-shaped reinforcing members 11 to each other. Connected and integrated. Note that an uncured self-curing filler is injected into the gap between the ring-shaped reinforcing member 11 and the existing pipe line P at the final stage of construction as will be described later. The material of the ring-shaped reinforcing member 11 is preferably carbon steel in terms of cost and strength, but may be stainless steel, synthetic resin, or the like. Further, the ring-shaped reinforcing member 11 may be formed, for example, by connecting arc-shaped members divided into a plurality of parts in the circumferential direction. Moreover, even if the existing pipe line P has a bend and a level | step difference, the pipe line reinforcing material 1 can cope with them by changing suitably the length of the pipe material 12c and the connecting bolt 12a in the circumferential direction. It is.

  Next, a plurality of fitting members 4 are attached in parallel to each other along the longitudinal direction of the existing pipe line P on the inner peripheral side of the pipe line reinforcing member 1. As shown in FIG. 3, the fitting member 4 is a molded product having a uniform cross section with an angular C shape whose cross-sectional shape is substantially the same as the fitting portion 11 a of the ring-shaped reinforcing member 11. Has a fixed length of about 5 m, for example. Attachment to the pipe line reinforcing member 1 is performed by fitting each of the ring-shaped reinforcing members 11 provided in the longitudinal direction of the existing pipe line P so that the opening of the fitting member 4 faces the center of the existing pipe line. This is done by fitting in 11a. The fitting member 4 having a certain length covers the repair length by connecting a plurality of fitting members 4 in the longitudinal direction of the existing pipe line P. That is, the plurality of fitting members 4 are connected by a connecting member (not shown) in a state where end surfaces adjacent to each other in the longitudinal direction are in contact with each other, thereby corresponding to the repair length of the existing pipeline P as a whole. The entire length is attached to the pipe reinforcement 1. The material of the fitting member 4 is excellent in corrosion resistance, lightweight, excellent in workability, and inexpensive, such as polyethylene resin such as polyethylene resin and unsaturated polyester resin. However, it is also possible to use a metal such as a fiber reinforced plastic having higher strength, a thermoplastic resin having flame retardancy, or stainless steel.

  And the inner surface member 2 is attached to the pipe line reinforcing material 1 via the plurality of fitting members 4 mounted in the longitudinal direction and the circumferential direction of the existing pipe line P on the existing pipe center side of the pipe line reinforcing material 1. It has been. Here, FIG. 5 is a front view of the inner surface member shown in FIG. 6 is a perspective view of the inner surface member connecting member 3 shown in FIG. 1, and FIG. 7 is an enlarged view of a portion C in FIG. 8 is a perspective view showing a state in which the inner surface member connecting material 3 is inserted into the inner surface member 2, and FIG. 9 is a front view showing a state in which the inner surface member connecting material 3 is tightly fitted to the inner surface member 2. .

  As shown in FIG. 5 and FIG. 8, the inner surface member 2 has a uniform symmetrical cross section having a certain length, for example, a length of about 5 m, along the longitudinal direction of the existing pipe line P. It has the side wall part 22 which coat | covers the existing pipeline P inner surface, and the concave insertion part 21 provided in the both ends of the direction orthogonal to the longitudinal direction of the side wall part 22. As shown in FIG. The concave insertion portion 21 is formed continuously along the longitudinal direction of the inner surface member 2 and is formed such that the in-recess dimension H2 thereof is uniform along the longitudinal direction. As will be described in detail later, as shown in FIG. 8, the convex bent portion 31 of the inner surface member connecting member 3 is inserted into the concave inserted portion 21. Further, the two recessed insertion portions 21 of the inner surface member 2 are provided so as to protrude on the same side of the side wall portion 22. As shown in FIG. 3, the inner surface member 2 has an opening of the fitting member 4 in a state where the recessed insertion portions 21 of the two inner surface members 2 (edges along the longitudinal direction of the inner surface member 2) are paired. By being inserted into the portion, the pipe reinforcement member 1 is securely held via the fitting member 4.

  The material of the inner surface member 2 is, like the fitting member 4 described above, excellent in corrosion resistance, lightweight, excellent in workability, and low in cost, such as a thermoplastic resin such as an olefin based resin such as polyethylene resin. It is preferable to use a thermosetting resin such as an unsaturated polyester resin, but it is also possible to use a higher strength fiber reinforced plastic, a flame retardant thermoplastic resin, or a metal such as stainless steel. When selecting the material of the inner surface member 2 and determining the thickness of the inner surface member 2, when the convex bent portion 31 of the inner surface member connecting member 3 is inserted into the concave inserted portion 21, the concave inserted portion 21 When the convex bent portion 31 is pulled out from the concave insertion portion 21 so as to push and spread, that is, the concave inner size H2 is increased, the concave inner dimension H2 of the concave insertion portion 21 is the original size. In order to return to the above, it is preferable that the concave inserted portion 21 is elastically deformed.

  The inner surface member 2 having a certain length covers the repair length by connecting a plurality of the inner surface members 2 in the longitudinal direction of the existing pipe line P. That is, the plurality of inner surface members 2 are connected by the inner surface member connecting member 3 in a state where end surfaces adjacent to each other in the longitudinal direction are in contact with each other, so that the length corresponding to the repair length of the existing pipe line P as a whole. The whole is attached to the fitting member 4. Here, in order to obtain watertightness between the inner surface members 2 adjacent to each other in the circumferential direction of the existing pipe line P, as shown in FIG. 3, each fitting member 4 and each inner surface attached to each fitting member 4. It is preferable that a sealing material 5 such as a synthetic rubber or a water-expandable rubber is interposed between the members 2 and the concave insertion portions 21 that are in contact with each other.

  Next, as shown in FIG. 6, the inner surface member coupling material 3 is a plate-shaped member having a certain length and a symmetrical shape, and a cross-sectional shape in a direction perpendicular to the longitudinal direction is a U-shape, Convex-curved portions 31 formed continuously along the longitudinal direction are provided at both ends in the direction orthogonal to the longitudinal direction. Further, as shown by an arrow X in FIG. 6, the convex bent portion 31 is formed so that the convex portion height increases from both longitudinal end portions toward the longitudinal central portion C, and the longitudinal central portion. In C, the convex portion height H1 is reached, and the convex portion height is maximum. Further, as shown in FIG. 7 in which the longitudinal central portion C is enlarged, the convex bent portion 31 has a convex height H1 at the central portion C in the longitudinal direction at a predetermined height H1 along the longitudinal direction. It is formed so as to be continuous by a length L.

  Here, as the inner surface member connection material 3, a metal material processed product such as stainless steel, a molded product of a thermoplastic resin, a molded product of a thermosetting resin (including FRP), or the like is employed. In order to connect the two inner surface members 2 in the longitudinal direction using the inner surface member connecting material 3, as shown in FIG. 8, the inner surface member connecting material is inserted into the concave insertion portion 21 at one end of one inner surface member 2. The third convex bent portion 31 is inserted and fitted to approximately half of its length, the remaining half is protruded, and the concave inserted portion 21 at one end of the other inner surface member 2 is projected to the remaining portion. Are inserted, the end surfaces of both inner surface members 2 are butted against each other and brought into contact with each other. In the present embodiment, the dimension H2 in the concave portion of the inner surface member 2 is slightly larger than the height of the convex portion at both longitudinal ends of the inner surface member connecting member 3, and the convex portion height H1 at the central portion C in the longitudinal direction. Has been slightly smaller than. The end faces in the longitudinal direction of the two inner surface members 2 are completely in contact with each other via the inner surface member connecting material 3, and the concave insertion portion 21 of the inner surface member 2 and the convex bent portion 31 of the inner surface member connecting material 3. The in-recess dimension H2 of the inner surface member 2 and the convex portion height H1 of the inner surface member coupling material 3 are determined so that the two are closely fitted. That is, the indented dimension H2 of the inner surface member 2 and the convex portion height H1 of the inner surface member connecting material 3 are the material and thickness of the inner surface member 2 and the inner surface member connecting material 3, and the elasticity of the concave insertion portion 21 of the inner surface member 2. It is determined in consideration of the degree of deformation.

  When the two inner surface members 2 are connected in the longitudinal direction, as shown in FIG. 9, the inner surface member connection material 3 is fitted to the inner surface member 2. The contact portion Y between the longitudinal center portion C and the inner side of the concave insertion portion 21 where the concave insertion portion 21 of the inner surface member 2 is expanded and the convex height of the convex bending portion 31 is maximum, and the inner surface The frictional force increases at the contact portion Z between the member connecting member 3 and the inner surface member 2, and the inner member 2 and the inner member connecting member 3 are strongly connected to each other. On the other hand, since a gap is formed between the convex bent portion 31 and the concave inserted portion 21 in the portion excluding the central portion C in the longitudinal direction where the convex portion height is maximum, the inner surface to the inner surface member 2 is formed. Insertion of the member connecting material 3 is relatively easy. Therefore, the inner surface members 2 can be easily and efficiently connected via the inner surface member connecting material 3.

  Moreover, as shown in FIG. 6, since the convex part height is the maximum in the center part C of the longitudinal direction of the convex bending part 31 of the inner surface member connection material 3, the mutual mutual connection of the inner surface members 2 to be connected is performed. The ends abut at the central portion C in the longitudinal direction of the convex bent portion 31. Therefore, the inner surface member connecting material 3 is in a state in which 1/2 of the longitudinal direction is inserted into each inner surface member 2, and the connection between the inner surface members 2 is more stable. Note that the position where the height of the convex portion is maximum is not necessarily limited to the central portion C in the longitudinal direction. Moreover, in this embodiment, although the convex bending part 31 is continuously formed along the longitudinal direction, it does not necessarily need to be formed continuously, for example, the longitudinal direction of the convex bending part 31 A discontinuous portion such as a notch may be provided in the middle of the convex bent portion 31. Further, the convex bent portion 31 is formed so that the convex portion height H1 at the central portion C in the longitudinal direction is continuous by a predetermined length L at a constant height H1 along the longitudinal direction. The contact area between the inner surface member connecting material 3 and the inner surface member connecting material 3 can be secured wider, and the holding force due to friction between the inner surface member 2 and the inner surface member connecting material 3 can be further increased.

  Further, as shown in FIG. 5, the side wall portion 22 of the inner surface member 2 has an arcuate shape on the concave inserted portion 21 side from both end portions in the direction orthogonal to the longitudinal direction of the side wall portion 22 toward the center portion of the side wall portion 22. It is formed so as to be inclined. Since the cross-sectional shape of the inner surface member 2 is an arcuate shape, when the inner surface member connecting material 3 is inserted into the inner surface member 2, the center portion of the inner surface member 2 curved in an arcuate shape is pressed against the inner surface member connecting material 3, The holding force by friction between the inner surface member 2 and the inner surface member connecting material 3 is further increased.

  Next, a method of laying each member described above in the existing pipeline P will be described. FIG. 10 is a cross-sectional view of the existing pipeline P showing a state before the inner surface member 2 is disposed along the inner surface of the existing pipeline P. FIG. 11 is a cross-sectional view of the existing pipeline P showing a state where the lining of the existing pipeline P has been completed.

  First, at the time of construction, an environment in which a person can work in the existing pipeline P is created by a method such as installing a water stop plug (not shown) on the upstream side of the existing pipeline P. And the pipe line reinforcing material 1 is arrange | positioned along the existing pipe line P inner surface. The ring-shaped reinforcing material 11 constituting the pipe line reinforcing material 1 is usually formed by assembling a plurality of divided arc-shaped members in the existing pipe line P. Then, a plurality of ring-shaped reinforcing members 11 in which a part or all of the members are assembled are joined in the longitudinal direction of the existing pipe line P by the connecting member 12 to obtain the tubular pipe line reinforcing material 1.

  After the assembly of the pipe reinforcement 1 is completed, the fitting members 4 are fitted into the fitting portions 11a of the ring-shaped reinforcement 11 constituting the pipe reinforcement 1, respectively. A state in which the fitting member 4 is fitted into the ring-shaped reinforcing member 11 is shown in a sectional view in FIG. Next, the inner surface member 2 is fitted to the fitting member 4 in pairs. The inner surface member 2 is connected using the inner surface member connecting material 3 by the above-described method, and is formed as a continuous body in the longitudinal direction. A state in which the inner surface member 2 is fitted to the fitting member 4 is shown in cross-sectional views in FIGS. 1 and 2. Here, when attaching the inner surface member 2, it is desirable to consider that the inner surface member connecting material 3 is not lined up continuously in the circumferential direction. That is, as shown in FIG. 1, the positions where the inner surface member 2 is connected by the inner surface member connecting material 3 in the circumferential direction of the existing pipeline P are shifted from each other in the longitudinal direction of the existing pipeline P. To do. By adopting such an arrangement, even when a tensile force acts on the inner surface member 2 in the longitudinal direction of the existing pipe P due to an earthquake or the like, even if a gap is formed in the connecting portion of the inner surface member 2, the gap Is not continuous in the circumferential direction of the existing pipeline P, but is stable as a structure. In the present invention, the fitting member 4 is not necessarily used, and the inner surface member 2 may be directly attached to the ring-shaped reinforcing member 11 constituting the pipe line reinforcing member 1 by fitting.

  And from the state which attached the inner surface member 2 shown in FIG. 1 and FIG. 2 to the pipe line reinforcing material 1, between the inner surface member 2 and the existing pipe line P, the self-hardening filler 100 is inject | poured. Harden. The final structure in which the self-curing filler 100 is injected is shown in a sectional view in FIG. As the self-curing filler 100, for example, a cement-based material such as cement milk, mortar, concrete, or a thermosetting resin such as an unsaturated polyester resin or an epoxy resin can be used. Selected. When injecting the self-curing filler 100, it may be injected by installing a wife mold or the like at the end of the existing pipe, or by injecting the inner surface member 2 with an injection port.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

It is structure explanatory drawing for showing one embodiment of the lining structure of the pipe line concerning the present invention, and cuts the existing pipe line by the vertical section along the longitudinal direction, and about the lining structure, the upper half It is a figure cut and shown in the same vertical section. It is AA sectional drawing of FIG. It is the B section enlarged view of FIG. It is sectional drawing along the longitudinal direction of the existing pipeline which shows the state which has arrange | positioned only the pipeline reinforcement material along the inner surface of the existing pipeline. It is a front view of the inner surface member shown in FIG. It is a perspective view of the inner surface member connection material shown in FIG. It is the C section enlarged view of FIG. It is a perspective view which shows the state which inserts an inner surface member coupling material in an inner surface member. It is a front view which shows the state which the inner surface member coupling material fitted to the inner surface member. It is sectional drawing of the existing pipeline which shows the state before an inner surface member is arrange | positioned along the existing pipeline inner surface. It is sectional drawing of the existing pipeline which shows the state which the lining of the existing pipeline was completed.

Explanation of symbols

1: Pipe line reinforcing material 2: Inner surface member 3: Inner surface member connecting material P: Existing pipe line 21: Concave insertion part 31: Convex bent part H1: Convex part height H2: Concave part dimension

Claims (3)

An inner surface member that is attached to the inner peripheral side of the duct reinforcing member disposed along the inner surface of the duct and has a concave insertion portion formed continuously along the longitudinal direction;
An inner surface member connecting material having a convex bent portion that is inserted into the concave insertion portion and formed along the longitudinal direction;
Convex height of the convex curved portion is higher from the longitudinal both end portions of the convex bent portion increases toward the longitudinal center portion, has a maximum in the longitudinally central portion of the convex bent portion,
The in-recess dimension of the concave insertion part is a uniform size along the longitudinal direction of the concave insertion part, and is larger than the height of the convex part at both longitudinal ends of the convex bending part. , The height of the convex portion at the central portion in the longitudinal direction of the convex bent portion ,
The conduit is characterized in that the convex bent portion is inserted into the concave inserted portion, and the convex bent portion and the concave inserted portion are closely fitted at a position where the height of the convex portion is maximized. Lining structure. The convex bent portion is formed such that the height of the convex portion in the central portion in the longitudinal direction continues for a predetermined length at the maximum height along the longitudinal direction of the convex bent portion. The lining structure of a pipe line according to claim 1 , wherein The inner surface member includes a side wall portion covering the inner surface of the pipe line along the longitudinal direction of the pipe line, and the concave insertion portion provided at both ends in a direction orthogonal to the longitudinal direction of the side wall part. And
The inner surface member connection material has a U-shaped cross-section in a direction orthogonal to the longitudinal direction of the inner surface member connection material, and the convex curve is formed at both ends in the direction orthogonal to the longitudinal direction of the inner surface member connection material. Part
The side wall portion, and being inclined to bow from both ends in a direction orthogonal to the longitudinal direction of the side wall portion in the hand the concave insertion member side as the Let suited to the central portion of the side wall portion, The lining structure of a pipe line according to claim 1 or 2 .

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