JP5430308B2 - Existing pipe repair method - Google Patents

Description

  The present invention relates to an existing pipe repair method, and more particularly to an existing pipe repair method for repairing an existing pipe by inserting a new pipe, which is a new tubular body, into the existing pipe to be repaired.

  In general, for pipes buried in the ground such as sewer pipes, it is inevitable that various deformations will occur over the years since installation, such as cracks, steps due to misalignment, diameter changes, etc. For this reason, there are problems that the flow force of the sewage pipe decreases and the amount of treated sewage increases due to the ingress of groundwater into the pipe. Even in situations where there is no particular deformation, countermeasures for aging and prevention of accidents are necessary, and various repairs are required for existing pipes that have passed a predetermined period after installation. Has been done.

  Currently, the sewage pipe regeneration repair technique is to excavate the ground by work from the ground, excavate the old pipe from the ground and insert a new pipe, repair the inner surface of the pipe from inside the pipe without digging The work method and the method of putting a new pipe in non-open cut are adopted.

  As a repair method for inserting a new pipe by non-open cutting, an uncured tubular lining material is introduced into the existing pipe to be repaired, and after expanding the diameter in the existing pipe, it is cured by light irradiation or heat treatment. In addition to the rehabilitation pipe construction method, as a construction method to further improve the homogenization of the rehabilitation pipe after completion, a so-called sheath pipe is introduced into the existing pipe while sequentially connecting new pipes of a predetermined length manufactured in the factory in advance. A construction method called “Sayakan” is known.

  In such a sheath pipe construction method, the new pipe is not hardened in the existing pipe, and the new pipe completed at the factory is inserted into the existing pipe. The distance between the inner peripheral surface of the pipe and the outer peripheral surface of the new pipe is preferably as large as possible. However, on the contrary, in order to ensure the cross-sectional area of the new pipe whose inner diameter is inevitably smaller than the existing pipe, and to stabilize the structure of the new rehabilitation pipe composed of the existing pipe and the new pipe introduced there In the process, it is desirable that the distance between the inner peripheral surface of the existing pipe and the outer peripheral surface of the new pipe is as small as possible. That is, if the distance between the existing pipe and the new pipe is large, there is a risk that groundwater that has passed through the existing pipe, which is an old pipe, will accumulate there, or a groundwater passage will be formed, leading to the depression of the ground. .

  Therefore, the gap between the new pipe and the existing pipe, that is, the gap between the outer peripheral surface of the new pipe and the inner peripheral surface of the existing pipe is filled with the curable filler to stabilize the structure when completed. Filling is performed.

  For example, as disclosed in Patent Document 1, the applicant of the present application uses a flexible outer cylinder between a new pipe and an existing pipe in a method of connecting a rehabilitated pipe piece to form a new pipe in the existing pipe. We propose a technology that installs a material, fills a fluid hardened material between the new tube and the outer tube material, and finally hardens it to complete the entire rehabilitated tube. As described above, when a new pipe is inserted into an existing pipe and the existing pipe is repaired, various techniques for filling and curing the filler between the two have been conventionally employed.

Japanese Patent Laid-Open No. 2008-95729

  However, in the above-described conventional technique, it is necessary to perform a work of filling a small space outside the new pipe inserted into the ready-made pipe with a curable filler, but this work is not easy and is a large-scale apparatus. Installation and complicated and time-consuming work are required. In addition, when the filling operation of the filler is not performed accurately, a space remains between the existing pipe and the new pipe, and the quality of the rehabilitated pipe after repair is adversely affected.

  In view of such a situation, the applicant of the present application is not a method of feeding a curable filler while maintaining fluidity between the outer peripheral surface of the new pipe and the inner peripheral surface of the existing pipe. Prior to introducing a pipe into an existing pipe, a technique has been proposed in which an intermediate cylindrical body is introduced into the existing pipe and a new pipe is inserted inside the pipe while being in close contact with the peripheral surface of the intermediate cylindrical body. According to this construction method, it is possible to avoid the occurrence of uneven filling of the filler in the gap between the new pipe and the existing pipe, and it is possible to always ensure stable quality of the renovated pipe.

  In this construction method, when the new tube is inserted into the intermediate cylindrical body, the insertion operation must be performed while bringing the both into close contact so as not to cause a gap. There is a demand that the insertion operation must be performed more smoothly without damaging the body.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to insert a new pipe in a method of repairing an existing pipe by interposing an intermediate tubular body between the new pipe and the existing pipe. The purpose is to provide an existing pipe repair method that can be smooth and can stabilize the quality of the rehabilitated pipe after repair.

In order to solve the above-mentioned problem, the existing pipe repair method according to claim 1 is the existing pipe repair method in which the existing pipe is repaired by introducing an existing new pipe into the existing pipe to be repaired. An intermediate cylindrical body having a predetermined thickness having an outer diameter that can be almost in contact with the inner peripheral surface of the existing pipe and elasticity in at least the thickness direction in the expanded state before the introduction of the new pipe to is introduced into the existing pipe and the intermediate cylindrical body introduction step, and a new tube insertion step of inserting the new tube to the intermediate tubular body, which is the inlet, the inner peripheral surface of the intermediate cylindrical body, said Xin A progress smoothing portion for improving the smoothness of the progress of the new tube in the intermediate cylindrical body in the tube insertion step is provided , and the progress smoothing portion has at least a smooth inner peripheral surface and flexibility, and is less stretchable. It is configured as an auxiliary pipe, and the outer peripheral surface of the auxiliary pipe is formed of the intermediate cylindrical body. Provided so as to cover the entire area of the peripheral surface, said new tube insertion step, the auxiliary tube of the intermediate tubular body, said that the new tube is carried out by inserting along the inner circumferential surface of the secondary pipe It is characterized by.

According to this configuration, the operation in which the ready-made new pipe advances while closely contacting the intermediate cylindrical body with the peripheral surface of the intermediate cylindrical body becomes smoother due to the presence of the progress smoothing portion. The progress smoothing unit can be applied to various configurations that can be easily conceived by those skilled in the art. For example, a configuration for preventing catching or reducing friction during the progress of the new tube to the intermediate cylindrical body, as much as possible reduced to such a configuration the adhesion between the cylindrical body inner circumferential surface entire and new tube outer peripheral surface of the, or the like can be applied.

  As a result, after the introduction of the new pipe, the gap between the new pipe and the existing pipe is filled with the intermediate cylindrical body due to the presence of the intermediate cylindrical body, effectively generating the remaining space. A stable new pipe installation state that can be avoided and does not play is obtained. And importantly, despite the presence of such an intermediate cylindrical body, the smoothness of the progress of the new tube in the intermediate cylindrical body in the new tube insertion process is ensured by the presence of the progress smoothing section. Therefore, the rapid processing of the construction method has been achieved.

  In addition, by facilitating the progress of the new pipe, it is possible to prevent the occurrence of damage during the movement of the new pipe within the existing pipe, and to fill the gap between the new pipe of the intermediate cylindrical body and the existing pipe. It becomes possible to improve the quality as a member. In addition, since the intermediate cylindrical body has elasticity at least in the thickness direction, the new pipe can be stably held when the new pipe is inserted, and the new pipe can be shake-resistant when an earthquake occurs. And a useful rehabilitation pipe is formed in the existing pipe by the intermediate cylindrical body and the new pipe.

Progressive smoothing unit, specifically in this configuration, since the inner circumferential surface of the intermediate tubular member having flexibility is constituted by the state of being covered with the auxiliary tube, the new tube that auxiliary pipe Will proceed. Then, the auxiliary tube, since it is formed of a non-elastic resin having a smooth inner peripheral surface flexibility and new tube proceeds smoothly along the inner circumferential surface of the secondary pipe.

The existing pipe repair method according to claim 2 is characterized in that, in the existing pipe repair method according to claim 1 , a lubricant is applied to an inner peripheral surface of the auxiliary pipe at least before the new pipe insertion step. To do. Thus, it is possible to ensure a more smooth progress of the new tube along the inner peripheral surface of the auxiliary pipe.

In order to solve the above-mentioned problem, the existing pipe repair method according to claim 3 is the existing pipe repair method in which the existing pipe is repaired by introducing an existing new pipe into the existing pipe to be repaired. An intermediate cylindrical body having a predetermined thickness having an outer diameter that can be almost in contact with the inner peripheral surface of the existing pipe and elasticity in at least the thickness direction in the expanded state before the introduction of the new pipe to An intermediate tubular body introducing step for introducing the new pipe into the existing intermediate tubular body, and a new pipe inserting step for inserting the new pipe into the introduced intermediate tubular body. A progress smoothing portion for improving the smoothness of the progress of the new tube in the intermediate cylindrical body in the tube insertion step is provided, and the progress smoothing portion performs a process for curing the inner peripheral surface of the intermediate cylindrical body. It is structured . According to this structure, a progress smoothing part can be formed in the inner peripheral surface, without attaching another member to an intermediate | middle cylindrical body, and reduction of a number of members and weight reduction can be achieved. Moreover, as a process for hardening of an inner peripheral surface, it is making it harden | cure by adding heat to the surface of the intermediate cylindrical body comprised with the nonwoven fabric, for example.

Existing pipe repairing method according to claim 4 is the existing pipe repairing method according to any one of claims 1-3, wherein the intermediate tubular member is formed by a nonwoven fabric, the core for reinforcing therein It is characterized by having a reinforcing intermediate layer in which the material is arranged so as to extend in the extending direction of the intermediate cylindrical body. According to this configuration, due to the presence of the reinforcing intermediate layer, it is possible to prevent the intermediate tubular body from being stretched in the advancing direction and the generation of wrinkles during the process of inserting the new pipe into the intermediate tubular body. Smoothness of progress can be ensured.

  According to the existing pipe repairing method according to the present invention, it is possible to prevent rattling of the new pipe by reliably filling the gap between the existing pipe to be repaired and the new pipe, and to provide earthquake resistance by flexible holding. Improvements can be made. Furthermore, the smoothness and quickness of the new pipe insertion work are achieved by improving the slipperiness of the new pipe in the new pipe insertion work. Thereby, the quality improvement and stabilization of the renovated pipe formed by inserting the new pipe can be achieved without complicating the work.

(A) And (B) is explanatory drawing which shows the insertion state of the intermediate cylindrical body to the existing pipe. It is explanatory drawing which shows the structural example of the intermediate cylindrical body which concerns on embodiment of this invention. It is operation | movement explanatory drawing which performs the new pipe | tube insertion process which concerns on this invention using the intermediate | middle cylindrical body shown in FIG. It is explanatory drawing which shows the other structural example of an intermediate | middle cylindrical body. The reference example about the additional formation of the progress smoothing part of an intermediate | middle cylindrical body is shown. It is explanatory drawing of the mesh body used for the additional formation of the progress smoothing part of the intermediate | middle cylindrical body shown in FIG. It is explanatory drawing which shows the state which made the net-like body shown in FIG. 6 adhere to the internal peripheral surface of an intermediate | middle cylindrical body. It is operation | movement explanatory drawing which performs a new pipe insertion process using the intermediate | middle cylindrical body which concerns on the reference example shown in FIGS. 5-7, The same figure (A) is sectional drawing of the axial direction of a pipe | tube, The same figure (B) is It is sectional drawing of the direction orthogonal to a pipe-axis direction. It is operation | movement explanatory drawing of the new tube insertion process in the intermediate | middle cylindrical body shown in FIG. It is composition explanatory drawing in the case of providing a progress smoothing part in a new pipe. It is explanatory drawing which shows the structure of the coating material used in order to form the new pipe shown in FIG. It is operation | movement explanatory drawing which performs a new pipe insertion process using the new pipe shown in FIG. 11, The same figure (A) is sectional drawing of the axial direction of a pipe | tube, The same figure (B) is a direction orthogonal to a pipe axial direction. It is sectional drawing. It is explanatory drawing which shows the whole sewer main structure as an example to which this invention is applied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 13 shows an example of a pipe rod to which the existing pipe repairing method of the present invention is applied. As shown in the drawing, a sewer main 10 that is an existing pipe to be repaired is disposed between manholes 100 and 102 installed at a predetermined interval. The case where this sewer main 10 is repaired using the method of the present invention will be described as an example.

  1 to 12 show an embodiment of the present invention in which a new pipe is introduced into a sewer main 10 for repair, and FIGS. 1 (A) and 1 (B) show existing pipes according to the present invention. The intermediate cylindrical body introduction process in a repair construction method is shown, and the state where the intermediate cylindrical body 12 is introduced into the sewer main 10 to be repaired is shown. 1A is a schematic longitudinal sectional view along the extending direction of the sewer main 10, and FIG. 1B is a schematic longitudinal sectional view in a direction orthogonal to the extending direction of the sewer main 10. FIG.

  As shown in the figure, first, an intermediate cylindrical body 12 is drawn into the sewer main pipe 10 from one manhole side (not shown) by, for example, pulling operation by pulling from the other side, and the diameter is increased. There is no state. The intermediate cylindrical body 12 is made of a flexible member, such as a nonwoven fabric, and has a thickness of 3 mm to 15 mm. The introduction of the intermediate cylindrical body 12 is not limited to the pull-in insertion as shown in FIG. 1, and a known reverse insertion method in which the intermediate cylindrical body 12 is fed while being reversed from the inside can also be used.

  FIG. 2 shows a more specific configuration example of the intermediate cylindrical body 12, for example, shown in a partial perspective view in a state where the diameter is expanded from the state shown in FIG. 1 by blowing in pressurized air. Yes. As shown in the figure, what is characteristic is that an auxiliary tube 30 as a progress smoothing portion is provided on the inner peripheral side of the intermediate cylindrical body 12.

  The auxiliary tube 30 is made of a material such as polyethylene, polypropylene, polyvinyl chloride, etc., and has at least a smooth inner peripheral surface and flexibility, is formed in a hard film shape with little stretchability, and has a thickness of 0.1 mm to A thickness of about 0.5 mm is suitable, and it can be formed very lightly. The auxiliary tube 30 is attached to the intermediate cylindrical body 12 by, for example, bonding the whole or a part of the outer peripheral surface so as to cover the entire inner peripheral surface of the intermediate cylindrical body 12. However, it is not always necessary to bond, and the function can also be achieved by simply installing the auxiliary tube 30 so as to contact the inner peripheral surface of the intermediate cylindrical body 12. Therefore, it is possible to attach the auxiliary pipe 30 at the manufacturing stage of the intermediate cylindrical body 12, but the present invention is not limited to this, and it is possible to attach it separately after the manufacturing process.

  FIG. 3 shows a process of inserting the new pipe 20 into the auxiliary pipe 30 (new pipe insertion process), and is a sectional view in the pipe axis direction of the sewer main pipe 10 which is an existing pipe. The new pipe 20 is formed in advance by factory production, and is configured to have an appropriate thickness corresponding to the situation of the sewer main pipe 10 at the installation location, for example, concrete. In addition, the new tube 20 is inserted and installed so that the new tube pieces 20-1 to 20-n formed in a length of about 50 cm to 100 cm, for example, are sequentially connected from the rear, and are continuous over the entire length. Is.

  Further, in the present embodiment, the leading body 18 whose outer diameter gradually decreases toward the distal end is detachably attached to the leading end of the leading new tube piece 20-1. The head body 18 is formed of a material such as a resin that is lightweight and has a hardness that does not deform during the process, and the new tube piece 20-1 facilitates the insertion process. It is. The maximum outer diameter of the head body 18 may be formed slightly larger than the outer diameter of the new tube 20.

  The advancement of the new tube piece 20-1 is performed, for example, by pulling the top body 18 in the direction of the arrow 200 with the wire 15 or the like. It is possible to use a normal method in which a hook portion 17 is provided at the front end of the top body 18 and the wire 15 or the like is locked to the hook portion 17 and pulled. Only the top of the new pipe piece is shown, but the new pipe pieces 20-2 to 20-n are sequentially connected from the rear, and the new pipe 20 is inserted into the entire sewer main 100 to be repaired. Is done.

In the advancing operation of the new tube 20, the leading body 18 advances while reliably expanding the intermediate tubular body 12 through the auxiliary tube 30 inside the intermediate tubular body 12. That is, the auxiliary tube 30 is flexible and deforms following the deformation of the intermediate cylindrical body 12 having elasticity in the thickness direction. Since the auxiliary pipe 30 is formed of a smooth inner peripheral surface and a material having little stretchability, the leading body 18 and the new pipe 20 are ensured to smoothly move and wrinkles are generated by friction. The situation is also avoided. Therefore, the auxiliary pipe 30 and the new pipe 20 that progresses from the rear proceed smoothly, improving the speed and accuracy of the new pipe insertion work, and improving the reliability of the existing pipe rehabilitation work. Further, the inner peripheral surface of the auxiliary tube 30 for example, by applying the lubricant of the silicon-based, the smoothness of the progress of the new tube 20 can be further improved.

  When the new pipe 20 is inserted and installed by this new pipe insertion process, the new pipe 20 is stable in a state where the intermediate cylindrical body 12 is slightly compressed against the elasticity of the intermediate cylindrical body 12 in the thickness direction. To do. Accordingly, the new pipe 20 is in a state of being flexibly held by the intermediate cylindrical body 12 in the existing pipe 10. Thereby, the installation state of the new pipe 20 is stabilized, and the shaking resistance of the new pipe 20 is improved when an earthquake occurs.

  FIG. 4 shows another form of the intermediate cylindrical body 12 applied to the method of the present invention. What is characteristic is that a core material 13 is provided as a reinforcing intermediate layer inside an intermediate cylindrical body 12 made of nonwoven fabric. The reinforcing core material 13 is, for example, polyester or polyamide. It is made of a non-stretchable resin fiber such as a thermoplastic resin fiber, carbon fiber, or the like such as acrylic, and is arranged and embedded so as to extend in the extending direction of the intermediate cylindrical body 12.

  Due to the presence of the reinforcing core 13, the intermediate tubular body 12 extends in the direction of travel of the new pipe or the new pipe 20 progresses during the process of inserting the new pipe into the intermediate tubular body 12. It is possible to prevent my occurrence. Therefore, the hindrance of the progress of the new tube 20 due to the deformation of the intermediate cylindrical body 12 or the like can be avoided.

  Moreover, in this Embodiment, the progress smoothing part is formed by giving the process to the inner peripheral surface of the intermediate cylindrical body 12, and hardening it. Specifically, the inner peripheral surface 12a of the intermediate cylindrical body 12 made of non-woven fabric is melt-cured by heat treatment to form a smooth inner peripheral surface 12a that is harder than other portions of the intermediate cylindrical body 12. .

  Thereby, a progress smoothing part can be formed in the intermediate | middle cylindrical body 12, without using other members like the auxiliary pipe 30, and reduction of a member number and simplification and cost reduction of the whole construction method are achieved. .

FIG. 5 shows a reference example of the additional formation of the progress smoothing portion on the intermediate cylindrical body 12. What is characteristic is that the projecting members 14 are scattered on the inner surface of the intermediate cylindrical body 12. The projecting member 14 is provided as a progress smoothing portion, and has a function of improving the smoothness of the progress of the new tube in the intermediate cylindrical body 12 in the new tube insertion process. In the figure, the size of the projecting portion 14 is not shown to be the same scale as the size of the intermediate cylindrical body 12 for easy understanding of the drawing. The actual size is, for example, an outer diameter of about 2 mm to 5 mm.

FIG. 6 shows an example of a means for forming the protruding member 14 on the inner surface of the intermediate cylindrical body 12 in this reference example, and a net-like body 16 is used as shown. The net-like body 16 is configured by a vertical wire 16a and a horizontal wire 16b, and the outer cylinder has a larger outer diameter than each wire at each intersection of the vertical wire 16a and the horizontal wire 16b. A substantially spherical enormous portion 16 c having a higher hardness than the shaped body 12 is formed. This enormous part 16c becomes the above-mentioned protruding member 14. In this embodiment, the mesh-like body is Ri Contact is formed of a resin, the size of the stitches is selected, for example, about 2 mm to 10 mm, the size of the enlarged portion 16c is the outer diameter is set to about 2~3mm The

FIG. 7 shows an example of a method for forming the intermediate cylindrical body 12 including the protruding member 14. As shown in the drawing, the net-like body in which the enormous portion 16 c is formed on the surface of the material member 12 b of the intermediate cylindrical body 12. 16 is attached. The material member 12b is made of, for example, a nonwoven fabric, and has flexibility as a whole. The intermediate cylindrical body 12 functions sufficiently by being installed in such a manner while maintaining flexibility. Further, if necessary, the intermediate cylindrical body 12 is formed by impregnating the material member 12a with a curable resin material. In addition, it is possible to cure over time such that it is cured after the insertion of a new tube into the inside, and it is possible to cure in a later step by impregnation with a photo-curing or thermosetting resin. .

  The net 16 is attached to the inner surface of the intermediate cylindrical body 12 in the process of forming the material member 12a of the intermediate cylindrical body 12 in a state where it has a flat plate shape. This can be done simply by fusing the mesh 16 to the surface of the film. Then, the intermediate body 12 with the projecting member 14 as shown in FIG. 5 is formed easily and inexpensively by forming the mesh body 16 into a cylindrical shape with the surface on the fused side being inward. be able to.

FIG. 8 shows a new pipe insertion process in the present reference example . FIG. 8A is a sectional view in the pipe axis direction of the sewer main pipe 10 which is an existing pipe, and FIG. 8B is orthogonal to the pipe axis direction. It is sectional drawing of a direction. This figure shows the state where the first new pipe 20 is inserted further inside the sewer main pipe 10 into which the intermediate cylindrical body 12 is introduced, as in FIG. The same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

In this reference example , the top body 18 is formed so that the maximum outer diameter is slightly larger than the outer diameter of the new pipe 20. The progress of the new pipe piece 20-1 is that the leading body 18 surely spreads the intermediate cylindrical body 12, and the new pipe 20 that proceeds from the rear has a slightly smaller outer diameter than the maximum outer diameter of the leading body 18. Therefore, the progress is smooth. In addition, in this reference example , although progress of the new pipe piece 20-1 is not shown in figure, the example performed by pushing and moving sequentially from the new pipe piece 20-2-20-n side following back is shown. .

Further, the intermediate tubular member 12, has the certain degree of flexibility, progress smoothing unit that put the present embodiment, i.e., by the presence of vast portion 16c of the inner peripheral surface of the intermediate tubular member 12 It is avoided that the intermediate cylindrical body 12 is in close contact with the front body 18 or the surface of the new pipe 20 more than necessary and hinders the smoothness of the progress.

That is, in the present reference example , the net-like body 16 in which the enormous portion 16c is formed is attached to the inner peripheral surface of the intermediate cylindrical body 12 as described above. The enormous portion 16c has a lower coefficient of friction and a higher hardness than the inserted uncured intermediate cylindrical body 12, and as shown in the drawing, the inner cylindrical surface of the intermediate cylindrical body 12 extends from the inner peripheral surface to the surface. It protrudes in a substantially spherical shape. Therefore, the outer surface of the top body 18 and the new tube 20 is in strong contact with the enormous portion 16c, and a state of being in close contact with the inner surface of the intermediate cylindrical body 12 is avoided. Therefore, the leading body 18 and the new tube 20 are satisfactorily slipped with respect to the intermediate cylindrical body 12, and the smoothness of their progress is ensured.

  In addition, FIG. 9 shows the state in which the head body 18 and the subsequent new pipe piece 20-1 are inserted by pulling into the sewer main pipe 10 which is an existing pipe, as shown in this figure. The diameter expansion state of the intermediate cylindrical body 12 is not limited to the state in which the diameter is increased to the extent that it is in contact with the sewer main pipe 10 as shown in FIG. 8 described above. That is, as shown in the figure, the new tube 20 is inserted while the intermediate cylindrical body 12 is expanded on the outer surface of the head body 18 by moving the head body 18 in the direction of 200 in the figure by pulling. Is possible.

And in the process which pushes and expands such an intermediate | middle cylindrical body 12, this reference example exhibits a function more. That is, in the situation where the leading body 18 and the succeeding new tube pieces 20-1 to 20-n are inserted and the intermediate body 12 is spread and advanced, the leading body 18 and the succeeding new tube pieces 20 are advanced. It is considered that the load of the intermediate cylindrical body 12 applied to −1 to n increases and the degree of adhesion increases. Therefore, due to the presence of the enormous portion 16c of the mesh body 16 which is the progress smoothing portion, reducing the degree of adhesion is an important function in the smooth insertion work of the new tube 20.

Figure 10 shows another reference example of progress smoothing unit. In the embodiment shown in FIG. 5 to FIG. 8, the mesh body 16 is installed on the inner peripheral surface of the intermediate cylindrical body 12 in order to make the projecting member 14 dotted on the inner surface of the intermediate cylindrical body 12. In the embodiment, as shown in the figure, the protruding member 14 is provided on the outer peripheral surface of the new pipe 20 to be inserted. In the drawing, the display size of the protruding member 14 is not the same scale as the display size of the new tube 20 in order to facilitate understanding of the configuration. That is, it is displayed larger than the actual size.

FIG. 11 shows an example of means for forming the new tube 20 having the protruding members 14 on the surface, and the coating material 22 having a large number of protruding members 14 on one surface is shown. For example, the coating material 22 is formed on one surface of a sheet member 22a formed of a resin member in the form of a film, with glass or plastic substantially spherical beads 22c having an outer diameter of about 2 mm to 3 mm as protruding members 14. It is formed by adhering so as to be scattered in large numbers. The beads 22c may be attached so that the spherical side of the hemispherical shape faces the outer surface, and the interval between the beads is set to, for example, about 2 mm to 10 mm in this reference example .

  Such a coating material 22 can be manufactured by mixing the beads in the coating material before molding so that the beads are exposed from the surface when molded into a sheet shape. The coating material 22 can be manufactured with a simple operation.

  And the new tube 22 inserted in the intermediate cylindrical body 12 by sticking the coating material 22 thus formed on the outer surface of the new tube 20 so that the beads 22c as the protruding members 14 protrude is configured. .

  FIG. 12 shows a new pipe insertion step of inserting the new pipe 20 having the form shown in FIG. 10 into the intermediate cylindrical body 12, and FIG. 12 (A) shows the sewer main pipe 10 which is an existing pipe. The tube axis direction sectional view and FIG. 5B are sectional views in the direction orthogonal to the tube axis direction. This figure has shown the state in which the first new pipe piece 20-1 is inserted further inside the sewer main pipe 10 in which the intermediate cylindrical body 12 is introduced. Similar to the operation shown in FIG. 8, the leading body 18 is attached to the distal end of the new tube piece 20-1 in the traveling direction. 8 is different from the configuration described in FIG. 8 in that the protruding member 14 is not provided on the inner peripheral surface of the intermediate cylindrical body 12, and the beads 22c as the protruding member 14 are provided on the outer surface of the new tube 20. It is provided.

  The leading body 18 and the new pipe piece 20-1 are pulled and inserted in the direction of the arrow 200 by a wire (not shown) or the like, but the leading body 18 advances while expanding the intermediate cylindrical body 12, and the succeeding new pipe The piece 20-1 advances while contacting the uncured intermediate cylindrical body 12. At this time, since the outer peripheral surface of the new tube 20 is dotted with beads 22c having a lower coefficient of friction and higher hardness than the uncured intermediate tubular body 12, the intermediate tubular body The degree of adhesion of the 12 new tubes 20 to the outer surface decreases, and the sliding of the new tubes 20 with respect to the intermediate cylindrical body 12 becomes good. Therefore, the insertion process of the new pipe 20 is further facilitated, damage to the intermediate cylindrical body 12 is avoided, and the reliability of the completed rehabilitation pipe is improved.

  It should be noted that the diameter expansion as a preparation before inserting the new pipe of the intermediate cylindrical body 12 does not need to be performed until it is substantially in contact with the inner peripheral surface of the sewer main pipe 10 as shown in FIG. In the case of the embodiment, as shown in FIG. 9, it is possible to proceed while expanding the diameter of the intermediate cylindrical body 12 in the state of expansion to the middle with the top body 18.

  Although not shown in the drawings, the projecting member is formed on the new pipe 20 as an example in which a member different from the new pipe 20 is installed on the outer peripheral surface of the new pipe 20, but as other embodiments, The surface shape of the outer peripheral surface of the new tube 20 itself, that is, the shape of the new tube 20 itself may be a shape having a protruding portion such as the above-described protruding member. That is, for example, when the new pipe 20 is manufactured from concrete, it is easily smoothed by using a formwork or the like in which convex shapes without corners are scattered on the outer surface. A new tube 20 having a portion can be formed.

The present invention is not limited to the configuration of the embodiment and reference examples above you facilities, and various modifications can be made within the scope of the invention. For example, the top body 18 in the new tube insertion process is not an essential component in the present invention method, but is used as a member for improving the smoothness of the present invention construction method. Therefore, it is also possible to implement the present invention method without using these members. That is, it is possible to insert a cylindrical tubular body piece as it is.

Moreover, in the said embodiment and reference example , the progress smoothing part comprises the auxiliary | assistant pipe | tube 30, the net-like body 16, and the coating material 22, and comprises the protrusion member 14, and aims at smoothing of a new pipe | tube insertion process. As described above, it is sufficient that some configuration for facilitating the progress can be applied to the inner peripheral surface of the intermediate cylindrical body 12 or the outer peripheral surface of the new tube 20.

DESCRIPTION OF SYMBOLS 10 Sewer main pipe 12 Intermediate cylindrical body 14 Protruding member 16 Net body 16c Enlarged part 18 Lead body 20 New pipe 20-1 to 20-n New pipe piece 22 Coating material 22c Bead

Claims (4)

In the existing pipe repair method in which the existing pipe is repaired by introducing a ready-made new pipe into the existing pipe to be repaired,
Before the introduction of the new pipe into the existing pipe, in the expanded state, at least an intermediate diameter between the outer diameter at which the entire circumference can almost contact the inner circumference of the existing pipe and a predetermined thickness having elasticity in the thickness direction. An intermediate cylindrical body introducing step of introducing the cylindrical body into the existing pipe;
A new tube insertion step of inserting the new tube into the introduced intermediate cylindrical body,
Provided on the inner peripheral surface of the intermediate cylindrical body a progress smoothing portion that improves the smoothness of the progress of the new pipe in the intermediate cylindrical body in the new pipe insertion step ,
The progress smoothing unit
It is configured as at least a smooth inner peripheral surface and a flexible flexible auxiliary tube, and the outer peripheral surface of the auxiliary tube is provided so as to cover the entire inner peripheral surface of the intermediate cylindrical body,
The new pipe insertion step is performed by inserting the new pipe along the inner peripheral surface of the auxiliary pipe into the auxiliary pipe in the intermediate cylindrical body . At least before the new tube insertion process,
The existing pipe repair method according to claim 1 , wherein a lubricant is applied to an inner peripheral surface of the auxiliary pipe. In the existing pipe repair method in which the existing pipe is repaired by introducing a ready-made new pipe into the existing pipe to be repaired,
Before the introduction of the new pipe into the existing pipe, in the expanded state, at least an intermediate diameter between the outer diameter at which the entire circumference can almost contact the inner circumference of the existing pipe and a predetermined thickness having elasticity in the thickness direction. An intermediate cylindrical body introducing step of introducing the cylindrical body into the existing pipe;
A new tube insertion step of inserting the new tube into the introduced intermediate cylindrical body,
Provided on the inner peripheral surface of the intermediate cylindrical body a progress smoothing portion that improves the smoothness of the progress of the new pipe in the intermediate cylindrical body in the new pipe insertion step,
The progress smoothing unit
An existing pipe repairing method characterized in that the inner cylindrical surface of the intermediate cylindrical body is subjected to a treatment for curing. The intermediate cylindrical body is formed of a non-woven fabric, and has a reinforcing intermediate layer in which a reinforcing core material is arranged to extend in the extending direction of the intermediate cylindrical body. The existing pipe repair method according to any one of claims 1 to 3 .

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