JP2014001785A - Reclaiming method of existent pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress floating of a reclamation pipe S, when injecting a back filling material C between an existent pipe K and the reclamation pipe S, without considerably deteriorating workability or reducing the strength of a composite pipe.SOLUTION: Near a pipe top part within the existent pipe K, a tubular body H is disposed to extend in a pipe axis direction and expanded by sealing a fluid such as water therein and while suppressing floating by abutting the tubular body to the reclamation pipe S from an upper side, the back filling material C is injected to a predetermined height which is about the half of a diameter of the reclamation pipe S. After the back filling material C is solidified, the fluid is discharged from the tubular body H, and a remaining space V between the reclamation pipe S and the existent pipe K is also filled by injecting the back filling material. After the fluid is discharged, the tubular body H per se may also be taken out of the existent pipe K.

Description

  The present invention relates to a method for rehabilitating an existing pipe such as an agricultural water pipe or a sewer pipe, for example, and particularly relates to measures for preventing the rehabilitation pipe from floating when a backfill material is filled between the existing pipe and the existing pipe.

  Conventionally, in existing pipes such as agricultural water pipes, sewer pipes, water pipes, gas pipes, etc., as a countermeasure against aging due to cracks or corrosion, the inner peripheral surface of existing pipes is lined with rehabilitation pipes such as synthetic resin Has been put to practical use. As an example, a long strip profile is spirally wound to form a tubular body (rehabilitation pipe) extending in the longitudinal direction of the existing pipe, and cement milk or mortar is formed between the outer peripheral surface and the inner peripheral face of the existing pipe. By filling the backfill material such as, a strong composite pipe in which the existing pipe, the backfill material and the renovated pipe are integrated can be configured.

  By the way, when injecting the backfill material as described above, it is necessary to arrange support works at predetermined intervals so that the rehabilitation pipe does not rise due to buoyancy, but the work is performed with a small diameter of the existing pipe. When it is difficult for a person to enter or exit, the opening at both ends is sealed and filled with water (for example, see Patent Document 1), and a weight such as a metal chain is loaded on the rehabilitation pipe. I try to prevent the rise.

  Further, in Patent Document 2, a long levitation prevention mat is disposed in an upper gap between a buried underground pipe (existing pipe) and a lining pipe (rehabilitation pipe), and an injection material (backfilling material) ) To prevent the lining tube from lifting up.

  In Patent Document 3, a tube that can be expanded by internal pressurization is spirally wound around the outer periphery of the rehabilitated tube, and this tube is filled with a grout (backfill material) and expanded, so that A method of adjusting the gap with the inner peripheral surface is described.

JP-A-7-108606 JP-A-63-88388 JP 7-47604 A

  First, in the conventional method described in Patent Document 1, the weight of a necessary weight increases as the diameter of the rehabilitation pipe increases, and a heavy metal chain or the like is carried in and out. It becomes difficult and the workability is greatly deteriorated. In addition, the rehabilitation pipe may be damaged when a metal chain or the like is carried in or out.

  On the other hand, in the method of filling a long cylindrical body (floating prevention mat, tube) with a backfill material as in Patent Document 2 and Patent Document 3, the backfill material filling layer in the composite pipe after construction remains. It will be cut off by the peripheral wall of the cylindrical body. For this reason, when a large external force such as seismic motion is applied, cracks are likely to occur, which may lead to a decrease in the strength of the composite pipe.

  The present invention has been made in view of such problems, and its purpose is to inject a backfilling material between existing pipes without significantly degrading the workability and reducing the strength of the composite pipe. This is to prevent the rehabilitation pipe from being lifted up.

  The present invention is a method for rehabilitating an existing pipe by forming a rehabilitation pipe inside the existing pipe and filling a backfilling material between the rehabilitation pipe and the existing pipe, and first, near the top of the pipe in the existing pipe. A cylindrical body is disposed so as to extend in the tube axis direction, and a fluid is sealed in the cylindrical body to be expanded. The backfill material is injected between the rehabilitated pipe and the existing pipe to a predetermined height while bringing the tubular body thus expanded into contact with the rehabilitated pipe from above and suppressing the rising. Then, after the injected backfill material is solidified, the fluid is discharged from the cylindrical body, and the backfill material is injected and filled into the remaining space between the rehabilitated pipe and the existing pipe.

  According to this method, a tubular body disposed near the top of an existing pipe is filled with a fluid such as water or high-pressure air and expanded, thereby suppressing the rehabilitation pipe from rising, Backing material can be injected between the existing pipe and the existing pipe. And if the backfilling material inject | poured to predetermined height solidifies, a fluid will be discharged | emitted from the said cylindrical body and a backfilling material will also be inject | poured into the remaining space between existing pipes.

  If the backfilling material is injected into the remaining space in this way, the cylindrical body not filled with fluid will be crushed, so the space between the existing pipe and the rehabilitation pipe will be filled with the backfilling material. Even when the cylindrical body remains, the filling layer can be prevented from being divided by the peripheral wall. Therefore, there is little worry that the strength of the composite pipe formed by integrating the rehabilitated pipe and the existing pipe is reduced.

  Moreover, there is no need to carry in and carry out heavy objects such as a metal chain in order to prevent the rehabilitation pipe from being lifted up, and there is no fear that the rehabilitation pipe will be damaged when carrying in or carrying out. Furthermore, even if the existing pipe has a large diameter and is easy for the operator to enter and exit, it is not necessary to provide a support work, so the workability is improved.

  The reason why the backfill material is solidified before discharging the fluid from the cylindrical body is to prevent the rehabilitation pipe from floating due to the buoyancy of the backfill material, so all of the backfill material is completely solidified. Even if not, it is sufficient that the buoyancy is reduced and the rehabilitation tube does not rise. Further, in the case of a cement-based material backing material, a hardening accelerator may be added to accelerate the solidification thereof.

  More preferably, after the fluid is discharged from the cylindrical body as described above, the cylindrical body itself is taken out of the existing pipe before filling with the remaining backfill material. It is. In this way, since the cylindrical body does not remain in the backfill material filling layer between the existing pipe and the rehabilitation pipe, a uniform cross section of strength and elastic modulus can be formed, and the strength of the composite pipe can be increased. Will be advantageous. In addition, injection of the backfill material may be started in parallel with the operation of taking out the cylindrical body, and the cylindrical body may be taken out before the filling is completed.

  In addition, before discharging the fluid from the cylindrical body as described above, the amount of the backfilling material injected between the rehabilitation pipe and the existing pipe may be set to a height that is at least half the diameter of the rehabilitation pipe. . This height is the height from the bottom of the existing pipe. And if the backfilling material inject | poured to the height more than half of a diameter solidifies, even if it inject | pours a backfilling material without hold | suppressing with a cylindrical body after that, there is no worry that a rehabilitation pipe will float.

  However, if the backfilling material is injected at a height to more than half the diameter of the rehabilitation pipe, the buoyancy from this backfilling material may increase considerably, and the force applied to the tubular body via the rehabilitation pipe is excessively large. As a result, the cylindrical body filled with fluid may be damaged. Therefore, the backfilling material is divided into multiple times to a height of more than half the diameter of the rehabilitation pipe so that the force applied to the cylindrical body does not become excessive, that is, after the backfilling material injected earlier has solidified, Minutes may be injected.

  Thus, from the viewpoint of preventing damage to the tubular body, it is preferable to dispose the tubular body over the entire construction section of the rehabilitated pipe so as to receive the force from the rehabilitated pipe in the entire longitudinal direction. . It is also preferable to increase the contact area with the rehabilitation pipe so that the cross-sectional shape of the cylindrical body expanded by the fluid sealing becomes an elliptical shape that is longer in the left-right direction than in the up-down direction. If it carries out like this, the pressure rise of the fluid inside a cylindrical body can be suppressed. It should be noted that the number of cylindrical bodies is not limited to one, and two or more cylindrical bodies may be disposed across the top of the existing pipe.

  Furthermore, it is preferable that the cylindrical body has a dimension in the vertical direction when the fluid is enclosed and expanded to be equal to or greater than the difference in diameter between the existing pipe and the rehabilitated pipe. In this way, when the lower part of the cylindrical body that expands due to fluid sealing presses the rehabilitation pipe, the contact area is increased by being crushed in an arc along the outer peripheral surface thereof, and the lower part of the rehabilitation pipe is more reliably secured. It can be pushed to the bottom of the pipe in the existing pipe and can follow the inclination.

  By the way, it is preferable from the viewpoint of workability that the cylindrical body that suppresses the rising of the rehabilitation pipe as described above is disposed near the top of the existing pipe before the rehabilitation pipe is formed in the existing pipe. The tubular body can be arranged in the existing pipe in parallel with the operation of forming the rehabilitated pipe, and after forming the rehabilitated pipe, the tubular body is drawn into the existing pipe and arranged. It is also possible to set up.

  In consideration of such drawing into the narrow space between the existing pipe and the rehabilitation pipe, it is preferable that the material of the cylindrical body has a certain degree of flexibility. Considering that the buoyancy of the embedding material is taken into consideration, as an example, the tubular body preferably uses a knitted fiber of polyester, nylon, polypropylene, vinylon or the like to ensure a certain level of strength. In addition, mesh products such as carbon and glass may be used.

  According to the present invention, a fluid is sealed in a cylindrical body disposed in the vicinity of the top of an existing pipe and inflated, thereby injecting a backfilling material to a predetermined height while suppressing the rising of the rehabilitation pipe. After the filling material solidified, the fluid was discharged from the tubular body, and the remaining space was filled with the backfilling material. For this reason, the backfilling material is injected into the existing pipe without deteriorating the strength of the composite pipe by preventing the filling layer of the backfilling material from being divided by the remaining peripheral wall of the cylindrical body. The rise of the rehabilitation pipe at the time can be suppressed. The workability is not significantly deteriorated as in the case of using a weight such as a metal chain.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an underground pipe for explaining a method for rehabilitating an existing pipe according to an embodiment of the present invention, and (a) is a vertical cross-sectional view showing a state in which a cylindrical body is disposed in the vicinity of a pipe top in the existing pipe. (B) is a cross-sectional view of the same. FIG. 2 is a view corresponding to FIG. 1 illustrating the formation of a rehabilitation pipe. FIG. 2 is a view corresponding to FIG. 1 in a state where a cylindrical body is expanded by enclosing water. FIG. 2 is a view corresponding to FIG. 1 in a state where a backfill material is injected to a predetermined height. FIG. 2 is a view corresponding to FIG. 1 in a state where a cylindrical body is taken out from an existing pipe. FIG. 2 is a view corresponding to FIG. 1 in a state where filling of the backfill material is completed. FIG. 4 is a view corresponding to FIG. 3 (b) showing a modified example of a flat cylindrical body having a large cross-sectional area. It is an enlarged view which shows the modification of the method of fixing a cylindrical body to the internal peripheral surface of an existing pipe.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is applied to a rehabilitation method (rehabilitation method) for an existing pipe such as a sewer pipe, for example. In FIGS. 1 to 6, an existing pipe K (for example, a fume is buried in the ground). In order to explain the respective steps of the operation of forming the rehabilitation pipe S in the pipe and filling the backfilling material in order, the longitudinal section of the existing pipe K, that is, the longitudinal section and the transverse section are shown. .

  Generally, existing pipes K such as sewer pipes are provided with manholes at a predetermined distance (approximately 50 m), and in the example shown, manholes M1 and M2 on the upstream side and downstream side of the construction section are used. Thus, the rehabilitation tube S is formed. That is, first, the rope R is inserted into the existing pipe K between the two manholes M1 and M2, the tubular body H is connected to one end of the rope R, and the rope R is pulled to establish the existing one. Introduce into tube K.

  Thereby, as shown in FIG. 1, the tubular body H can be bridged between the manholes M <b> 1 and M <b> 2, and can be disposed near the top of the existing pipe K over the entire construction section of the renovated pipe S. The cylindrical body H is, for example, made of a polyester mesh hose and rubberized to have a multilayer structure, and can withstand high water pressure and maintain water tightness. In addition to polyester, a knitted fabric of nylon, polypropylene, vinylon or the like may be used.

  As shown in (b) of each figure, in this embodiment, as an example, cylindrical bodies H are juxtaposed on the left and right sides of the top of the existing pipe K, and FIG. 1 (b) and FIG. As shown in (b), the cross-sectional shape of the cylindrical body H before enclosing water is a flat sheath shape crushed so as to be substantially along the inner peripheral surface of the existing pipe K. As will be described later, this cylindrical body H expands when water is enclosed, and its cross section is in the circumferential direction (left-right direction) of the existing pipe K as shown in FIGS. 3 (b) and 4 (b). Long and short in the radial direction (vertical direction).

  As shown in FIG. 2 (a), the rope R is pulled with a sufficiently large tension so that the cylindrical body H spanned between the manholes M1 and M2 does not bend greatly. The renovated pipe S is formed from the manhole M1 toward the manhole M2 by the push type pipe making apparatus W. That is, in this embodiment, the tubular body H is first disposed in the existing pipe K, and then the rehabilitation pipe S is formed.

  That is, as shown in the figure, a long profile P is fed out from a take-up drum D installed on the ground and continuously supplied to a pipe making apparatus W installed in the manhole M1. In this pipe making apparatus W, while winding the profile P in a spiral shape, the side edges of the winding parts adjacent to each other are joined together to form a tubular body (rehabilitated pipe S). Then, while rotating the rehabilitation pipe S, the front end portion is fed into the existing pipe K, while the profile P is added to the rear end portion.

  As an example, the profile P is obtained by extruding a flexible synthetic resin, for example, hard vinyl chloride, polyethylene, polypropylene, etc. into a long band shape, and although not shown, both side edges thereof are omitted. Each part is formed with a joint concave part and a joint convex part extending in the longitudinal direction, and is fitted by being sandwiched between rollers of the pipe making apparatus W.

  Then, while the profile P is wound to form the rehabilitated pipe S, it is fed into the existing pipe K and stretched. If the front end of the rehabilitated pipe S reaches the manhole M2, the pipe making apparatus after cutting the profile P Remove W from manhole M1. Then, one end (for example, the end on the manhole M1 side) of the cylindrical body H is closed, and water is injected at a high pressure from the other end (for example, the end on the manhole M2 side) to expand the cylindrical body H as shown in FIG. Let

  The cylindrical body H expanded in this way is arranged over the entire construction section of the rehabilitation pipe S as described above, and the lower part thereof comes into contact with the rehabilitation pipe S over the whole lengthwise direction. Further, as shown in FIG. 3 (b), since the vertical dimension of the cross section of the oval cylindrical body H is set to be greater than the difference in diameter between the existing pipe K and the renovated pipe S, the cylindrical body H has expanded. The lower part of the cylindrical body H is crushed into an arc shape along the outer peripheral surface of the rehabilitation pipe S, and the contact area is increased.

  Moreover, the lower part of the rehabilitation pipe S pressed from above by the cylindrical body H thus expanded is pressed against the bottom of the existing pipe K as shown in FIG. In this way, the rehabilitated pipe S is positioned along the inclination of the existing pipe K, and both ends of the space V between the rehabilitated pipe S and the existing pipe K, that is, the annular opening portions facing the manholes M1 and M2, are sealed. Sealed with material G (see FIG. 4).

  Then, an injection hose B is attached so as to pass through the sealing material G and face the rehabilitation pipe S and the existing pipe K, and a backfilling material C (for example, cement milk, mortar, etc. ). At this time, as shown in FIG. 4, first, the backfilling material C is injected to a half height slightly exceeding the half of the diameter of the rehabilitation pipe S, and left for a while (for example, about one day) until it is solidified.

  Thus, the backfill material C injected into the space V between the rehabilitated pipe S and the existing pipe K flows toward the bottom of the existing pipe K, and adds buoyancy to the rehabilitated pipe S. As described above, the rehabilitation pipe S is pressed from above by the cylindrical body H, and its lifting is suitably suppressed. In addition, the buoyancy applied to the rehabilitated pipe S is received by the cylindrical body H, but the cylindrical body H is provided over the construction section, and the lower part thereof is crushed to increase the contact area with the regenerated pipe S. Therefore, the water pressure inside the cylindrical body H does not become excessively high.

  In particular, in the present embodiment, two cylindrical bodies H are provided side by side on both sides of the top of the existing pipe K, and the buoyancy applied to the rehabilitated pipe S is dispersed in the two cylindrical bodies H. In combination with this, there is no worry that the cylindrical body H is damaged. Moreover, since a large force does not act locally on the top of the existing pipe K where the cylindrical body H is disposed, there is no fear of damaging the existing pipe K.

  And if the backfilling material C injected to the height of the majority of the diameter of the rehabilitation pipe S is substantially solidified and does not substantially add buoyancy to the rehabilitation pipe S, water is discharged from the tubular body H. Later, the rope R is pulled to take out the cylindrical body H from the existing pipe K (see FIG. 5). Then, the backfill material C is also injected into the remaining space V (relatively upper space V) between the existing pipe K and the renovated pipe S, and the existing pipe K and the renewed pipe S as shown in FIG. The filling of the backfill material C into the space V between the two is completed.

  When the backfill material C filled in this way is solidified, the rehabilitating pipe S and the existing pipe K are integrated with this filled layer (indicated by C in the figure) to form a strong composite pipe. And according to this embodiment, the cylindrical body H does not remain in the filling layer of the backfill material C, and a cross section having a uniform strength and elastic modulus is formed.

  Therefore, according to the rehabilitation method according to the present embodiment, the floating of the rehabilitation pipe S when the backfilling material C is injected into the space V between the existing pipe K is arranged near the top of the pipe in the existing pipe K. In addition to being suppressed by the provided cylindrical body H, the cylindrical body H does not remain in the packed layer of the backfill material C in the finished composite pipe, and high strength can be stably secured.

  Moreover, since it is not necessary to carry in and carry out heavy objects such as metal chains in order to prevent the rehabilitation pipe S from being lifted up, it is possible to prevent deterioration of workability, and to the rehabilitation pipe S at the time of carrying in and out. There is no worry of scratching. Even if it is applied to an existing pipe K having a large diameter, the workability is high because there is no need to provide a support. Moreover, in this case, since it is not necessary to make a hole in the rehabilitation pipe S for the support work, there is an effect that the water stoppage is not lowered.

  Here, after the backfilling material C injected to the height of the majority of the diameter of the rehabilitation pipe S is solidified, the tubular body H is taken out because of the rehabilitation by buoyancy from the backfilling material C. This is to prevent the tube S from floating up. Therefore, even if a part of the backfill material C is not solidified, the buoyancy of the backfilling material C is only required to be sufficiently small. Based on the size of the space V between them and the composition of the backfilling material C, it is desirable to investigate in advance through experiments or the like.

  Further, a curing accelerator may be added to accelerate the solidification of the backfill material C and contribute to shortening the work period. Examples of the hardening accelerator include calcium aluminate materials such as alumina cement, alkali metal salts such as sodium carbonate, alkaline earth metal salts such as calcium chloride, and metal double salts such as alum.

-Other embodiments-
As described above, in the present embodiment, the cylindrical body H is taken out after the backfilling material C injected halfway is solidified, and then the remaining backfilling material C is injected. Injecting the remaining backfill material C may be started in the middle of the operation of taking out the tube, and the cylindrical body H may be taken out before the filling is completed. Further, before the discharge of water from the cylindrical body H is completed, the extraction of the cylindrical body H and the injection of the backfill material C may be started.

  Further, the backfill material C may be injected while leaving the cylindrical body H from which water has been discharged. Since the cylindrical body H is crushed by the backfill material C thus injected, the possibility that the peripheral wall divides the packed layer of the backfill material C is low. Of course, the backfill material C may be injected after the cylindrical body H is crushed toward the inner peripheral surface of the existing pipe K after the water is discharged.

  Further, the backfilling material C is injected at a height of a majority of the diameter of the rehabilitation pipe S. However, the backfilling material C may be injected in multiple portions up to that height. If the back filling material C for the previous injection is solidified and then injected for the next injection, the buoyancy generated by the back filling material C becomes smaller, so the force applied to the tubular body H is made smaller. be able to.

  Further, as described above, it is not necessary to dispose the cylindrical body H over the entire construction section of the rehabilitation pipe S, and the tubular body H may be disposed only in a part of the construction section, The cross-sectional shape of the expanded cylindrical body H is not limited to the above embodiment. The vertical dimension at the time of expansion of the cylindrical body H may be less than the difference in diameter between the existing pipe K and the renovated pipe S.

  The number of the cylindrical bodies H arranged in the existing pipe K may be one instead of two, or three or more, but it is preferable that the number is not so large in consideration of workability. As an example, as shown in FIG. 7, a cylindrical body Ha having a larger cross-sectional area and a flat shape may be used, which is advantageous in securing a contact area. Although not shown, a cylindrical body having a plurality of portions having different cross-sectional shapes in the longitudinal direction may be used. The fluid to be sealed in the cylindrical body H is not limited to water, and may be oil, or may be compressed air instead of liquid.

  In the above-described embodiment, the tubular body H is first disposed in the existing pipe K, and then the rehabilitation pipe S is formed. However, the tubular body is formed in parallel with the formation of the rehabilitation pipe S. H may be disposed in the existing pipe S, or the tubular body H may be disposed in the gap with the existing pipe K after the renovated pipe S is formed. When the tubular body H is disposed after the rehabilitation pipe S is formed, although not shown, for example, a flexible steel tape is inserted between the existing pipe K and the rehabilitation pipe S, and a rope is passed through the tape. The tubular body H may be introduced into the existing pipe K by connecting one end of the R and connecting the tubular body H to the other end and pulling the tape and the rope R.

  Furthermore, as described above, in the present embodiment, the case where the profile P is spirally wound by the so-called main push type pipe making apparatus W to form the rehabilitation pipe S is described, but the present invention is not limited to this. For example, it may be a so-called self-propelled pipe making method in which a rehabilitation pipe is formed by spirally winding a profile while moving in an existing pipe toward a construction end point.

  In this case, since the existing pipe K has a relatively large diameter and allows the operator to enter and exit, the tubular body H is bridged between the manholes M1 and M2 and pulled by the rope R as in the above-described embodiment. Instead, for example, as shown in an enlarged view in FIG. 8, the cylindrical body H may be fixed by a belt E, a concrete screw F, or the like at intervals in the longitudinal direction, or may be bonded. In addition, what is necessary is just to set the intensity | strength of the belt E to the grade which tears, when the cylindrical body H expand | swells by sealing of the fluid.

  Furthermore, the present invention is not limited to the case where the rehabilitating tube S is formed by spirally winding the long profile P as described above. That is, although not shown, the present invention can also be applied to a rehabilitation pipe formed by connecting a plurality of plastic pipe members in the longitudinal direction, for example. In the rehabilitated pipe formed in this way, the cylindrical body H may be disposed on the top of the existing pipe S prior to the formation, or the regenerated pipe S is first formed after the regenerated pipe S is formed. You may arrange | position the cylindrical body H between K.

  In the present invention, the rehabilitation method for existing pipes can suppress the rise of the rehabilitation pipes when injecting the backfill material without causing a significant deterioration in workability or a reduction in the strength of the composite pipes. It is highly effective when applied to existing small diameter pipes.

C Backfill material H Tubular body K Existing pipe P Profile S Rehabilitation pipe V Space

Claims (7)

A rehabilitation method for an existing pipe, in which a rehabilitation pipe is formed inside the existing pipe and a backfill material is filled between the rehabilitation pipe and the existing pipe,
After disposing a cylindrical body so as to extend in the direction of the tube axis in the vicinity of the top of the pipe in the existing pipe, the cylindrical body is filled with fluid and expanded,
Injecting the backfilling material to a predetermined height between the rehabilitation pipe and the existing pipe while suppressing the rising by bringing the expanded tubular body into contact with the rehabilitation pipe from above,
After the injected backfill material is solidified, the fluid is discharged from the cylindrical body, and the remaining space between the rehabilitated pipe and the existing pipe is injected and filled,
A method for rehabilitating existing pipes. In the rehabilitation method of the existing pipe according to claim 1,
A method for rehabilitating an existing pipe, in which after the fluid is discharged from the cylindrical body and before the filling of the backfill material is completed, the cylindrical body itself is taken out of the existing pipe. In the rehabilitation method of the existing pipe according to claim 1 or 2,
A method for rehabilitating an existing pipe, wherein a backfilling material is injected to a height of more than half of the diameter of the rehabilitation pipe while suppressing the rising of the rehabilitation pipe by the expanded tubular body. In the rehabilitation method of the existing pipe according to claim 3,
A method for rehabilitating an existing pipe, in which a backfilling material is injected in a plurality of times to a height of more than half the diameter of the rehabilitation pipe. In the rehabilitation method of the existing pipe according to any one of claims 1 to 4,
The said cylindrical body is arrange | positioned over the area | region which forms a rehabilitation pipe | tube, The rehabilitation method of the existing pipe | tube whose cross-sectional shape when it expand | swells by enclosure of a fluid is longer in the left-right direction than an up-down direction. In the rehabilitation method of the existing pipe according to any one of claims 1 to 5,
The tubular body is a method for rehabilitating an existing pipe, wherein a dimension in the vertical direction when the cylindrical body is expanded by enclosing a fluid is equal to or greater than a difference in diameter between the existing pipe and the rehabilitated pipe. In the rehabilitation method of the existing pipe according to any one of claims 1 to 6,
A method for rehabilitating an existing pipe, wherein a tubular body is disposed in the existing pipe before forming the rehabilitation pipe.