JP4881844B2 - Seismic retrofitting method for existing pipe manhole connections - Google Patents

Description

  The present invention provides an anti-seismic work for an existing pipe manhole connection portion that performs non-cutting to make the existing pipe manhole connection portion that is fitted and connected to a pipe hole in a peripheral wall constituting the human hole. Regarding the law.

  Seismic facilities have been severely damaged by major earthquakes that occurred in the past, and the impact on citizens' lives was serious. Among them, damage to existing pipes caused damage, slipping out, slipping, cracking, etc., especially existing pipes were fitted and connected to the hole in the peripheral wall of the human hole. A lot of damage was seen in the existing pipe-hole connection. This is due to the fact that the existing pipe human hole connection part between the existing pipe and the human hole is rigidly joined, and therefore the existing pipe human hole connection part cannot absorb the difference in motion with respect to the earthquake motion.

For this reason, the earthquake resistance of the existing pipe manhole connection part of the existing pipe and the manhole which became a rigid joint was calculated | required. As a method of making the existing pipe manhole connection part that is rigidly jointed, the peripheral wall of the human hole around the outside of the existing pipe is cut with a certain width from inside the human hole with a tubular cutter, and the existing pipe and human A method has been disclosed in which a peripheral wall of a hole is cut off and an elastic water-stopping material that can be elastically deformed is filled into an annular gap between an existing pipe formed by cutting and the peripheral wall of a human hole. (For example, refer to Patent Document 1).
JP 2001-40751 A

  However, in the seismic retrofitting method for the existing pipe manhole connection part, the edge cut between the existing pipe and the manhole peripheral wall by the cutter pushes the cutter until it penetrates the manhole peripheral wall and protrudes out of the peripheral wall. An annular gap is largely opened around the existing pipe on the outer peripheral wall surface of the peripheral wall of the hole, and earth and sand or water outside the peripheral wall of the human hole flows into the annular gap, so that the elastic water blocking material into the annular gap It became difficult to fill, and the work could be hindered.

  Further, in order to ensure the edge cutting between the existing pipe and the peripheral wall of the human hole, the cutter is protruded beyond the peripheral wall of the human hole more than necessary. In general, there are many buried objects such as underground cables and various fluid buried pipes in the vicinity of the peripheral wall of the human hole in the vicinity of the peripheral wall. For this reason, there is a risk of damaging buried objects such as underground cables and various fluid buried pipes by the cutter protruding outside the circumferential wall of the human hole during the edge cutting operation between the existing pipe and the peripheral wall of the human hole. There is a problem.

  The object of the present invention is good workability, there is no risk of damaging embedded objects such as underground cables and various fluid embedded pipes around the peripheral wall of the human hole, The object is to provide an earthquake resistant construction method for existing pipe manhole connections that can be earthquake resistant without affecting the strength.

In order to achieve the above-described object, the invention according to claim 1 is to provide an existing pipe for improving the earthquake resistance of an existing pipe human hole connecting portion in which the existing pipe is fitted and connected to a pipe hole of a peripheral wall of the human hole. A seismic construction method for a human hole connecting portion, wherein the existing pipe fitted in the pipe hole of the peripheral wall of the human hole does not exceed the outer peripheral wall surface in the vicinity of the outer peripheral wall surface of the peripheral wall, and an earthquake has occurred. Sometimes breaking easily , cutting at a position where the existing pipe and the base peripheral wall portion of the human hole can be edged , a step of arranging a lining pipe inside the existing pipe, and a lining pipe inside the existing pipe After disposing, the step of removing the cut end portion of the existing pipe fitted into the pipe hole of the peripheral wall of the human hole from the pipe hole, and the front end portion of the existing pipe removed from the pipe hole And a step of providing an elastic water-stop tubular portion that is elastically deformable in the gap.

  According to the earthquake resistance construction method of the existing pipe manhole connecting portion according to claim 1, the existing pipe fitted into the pipe hole of the peripheral wall of the human hole is connected to the outer peripheral wall surface in the vicinity of the outer peripheral wall surface of the peripheral wall. Because the cutter does not protrude beyond the perimeter wall of the human hole, the cutter does not protrude from the peripheral wall of the human hole. There is no risk of scratching.

  Further, after the lining pipe is disposed inside the existing pipe, when the cut end portion of the existing pipe fitted into the pipe hole of the peripheral wall of the human hole is removed from the pipe hole, the existing pipe Is cut at a position not exceeding the outer peripheral wall surface in the vicinity of the outer peripheral wall surface of the peripheral wall, so that the space between the outer peripheral wall surface of the peripheral wall of the human hole and the surrounding of the existing pipe is closed, and the outer peripheral wall surface and the existing pipe are closed. It is possible to prevent the earth and sand outside the peripheral wall of the human hole from flowing into the tube hole of the peripheral wall of the human hole from between the surroundings, and also to prevent or minimize the inflow of water. Work can be done easily.

  Further, the lining pipe arranged inside the existing pipe serves as an existing pipe, and the end of the existing pipe where the lining pipe in the portion from which the existing pipe is removed is fitted into the hole in the peripheral wall of the human hole. Part. And, since the elastic water-stop tubular portion that can be elastically deformed is provided in the gap obtained by removing the tip portion of the existing pipe from the pipe hole, when an earthquake occurs, the existing pipe and the person constituted by the lining pipe generated by the earthquake The difference in motion with the peripheral wall of the hole can be absorbed by the elastic water-stop tubular portion, and the existing pipe manhole connection portion can be prevented from being destroyed by the earthquake motion.

Also, the end of the existing pipe after removing the tip is easily destroyed when an earthquake occurs, and the existing pipe and the base peripheral wall of the manhole are in a position where it can be cut off. Due to the difference in movement with the peripheral wall of the manhole, the end portion of the existing pipe fitted in the pipe hole can be easily broken, so that the existing pipe manhole connection can be prevented from being damaged, and the existing pipe is broken. Since the lining pipe serves as an existing pipe as described above, the end of the lining pipe constitutes the end of the existing pipe that is fitted into the hole in the peripheral wall of the human hole. Even if there is a break at the end of the existing pipe, it can be sufficiently compensated by the lining pipe, and there is no possibility of impairing the function as the existing pipe.

  Hereinafter, the best mode for carrying out the seismic retrofitting method for an existing pipe manhole connection part according to the present invention will be described in detail with reference to the embodiments shown in the drawings.

  FIG. 1 to FIG. 9 show an example of the implementation of the seismic retrofitting method for an existing pipe human hole connection part according to the present invention, FIG. 1 is a longitudinal sectional view showing a state before construction, and FIG. 2 is a peripheral wall of a human hole FIG. 3 is a longitudinal sectional view showing a state in which an existing pipe fitted in the pipe hole is cut at a position not exceeding the outer peripheral wall surface in the vicinity of the outer peripheral wall surface of the peripheral wall, and FIG. 3 shows a lining pipe inside the existing pipe shown in FIG. FIG. 4 is a longitudinal sectional view showing another example of the lining pipe, and FIG. 5 is a diagram showing a state where the lining pipe is placed inside the existing pipe and then fitted into the hole in the peripheral wall of the human hole. Fig. 6 is a longitudinal sectional view showing a state in which the cut end portion of the existing pipe is removed from the tube hole, and Fig. 6 is provided with an elastic water-stop tubular portion that can be elastically deformed in the gap obtained by removing the tip portion of the existing pipe from the tube hole. FIG. 7, FIG. 8, FIG. 9 are all enlarged sectional views showing other examples of the elastic water-stopping tubular portion.

  FIG. 1 shows an example of a manhole (manhole) for carrying out the construction method of this example. As shown in the figure, the existing pipe 2 laid in the ground 1 in the state before construction is a manhole. 3, an existing pipe human hole connecting portion 6 is formed by being inserted into and connected to the pipe hole 5 of the basic peripheral wall portion 4a of the human hole 3. The manhole 3 is formed on a foundation peripheral wall portion 4a constructed of concrete, a peripheral wall portion 4 is formed in advance by a concrete, and the peripheral wall 4 is formed. The upper end opening portion 7 is closed with a lid 8 so that it can be opened and closed. Has been.

  As shown in FIG. 2, first, the seismic improvement method of the present example performed on the existing pipe human hole connecting portion 6 having such a structure is fitted into the pipe hole 5 of the basic peripheral wall portion 4 a of the human hole 3. The tip portion 2a of the existing pipe 2 is cut at a position P that does not exceed the outer peripheral wall surface 9 in the vicinity of the outer peripheral wall surface 9 of the foundation peripheral wall portion 4a.

  The position P that does not exceed the outer peripheral wall surface 9 in the vicinity of the outer peripheral wall surface 9 of the foundation peripheral wall portion 4a is fitted in the tube hole 5 of the basic peripheral wall portion 4a after the distal end portion 2a of the existing pipe 2 is removed in a process described later. The end of the existing pipe 2 remaining in the state of being broken is a position where the existing pipe 2 and the basic peripheral wall portion 4a of the human hole 3 can be cut off easily when an earthquake occurs. The length L of the existing pipe 2 remaining in the state of being fitted in the pipe hole 5 of the basic peripheral wall part 4a after removal of the distal end portion 2a of the existing pipe 2 is preferably about 0 to 5 cm, but into the pipe hole 5 In order to prevent inflow of earth and sand and water, it is particularly preferable that the distance is at least 0.5 cm. In setting the position P that does not exceed the outer peripheral wall surface 9 in the vicinity of the outer peripheral wall surface 9 of the foundation peripheral wall portion 4a, the foundation peripheral wall portion 4a is hit on the spot, and the wall thickness is not necessarily as designed. It is preferable that the wall thickness of the peripheral wall portion 4a is measured by applying electromagnetic waves or ultrasonic waves, and a position P not exceeding the outer peripheral wall surface 9 is set in the vicinity of the outer peripheral wall surface 9 of the basic peripheral wall portion 4a.

  In the cutting of the existing pipe 2 fitted in the pipe hole 5 of the basic peripheral wall portion 4a of the human hole 3, for example, a disc-shaped cutter is used, and this cutter is inserted into the existing pipe 2 so as to be installed. The tube 2 is cut from the inner peripheral side.

  Next, as shown in FIG. 3, the lining pipe 10 is disposed inside the existing pipe 2. In the lining pipe 10, in this example, the cylindrical lining material 11 in a curable soft state is inserted into the existing pipe 2, and the peripheral wall surface of the cylindrical lining material 11 is pressed against the inner wall of the existing pipe 2. The lining tube 10 is formed and disposed by curing.

  A known technique is used in the method of inserting the cylindrical lining material 11 into the existing pipe 2 and forming and arranging the lining pipe 10 on the inner wall of the existing pipe 2.

  For example, a flexible tubular lining material 11 impregnated or coated with an uncured curable resin is used for existing pipes using the techniques disclosed in Japanese Patent Publication No. 7-4853 and Japanese Patent Application Laid-Open No. 2005-90581. The lining pipe 10 can be formed and disposed by inserting it into the inner wall 2 and pressing the peripheral wall surface of the cylindrical lining material 11 against the inner wall of the existing pipe 2 to cure the curable resin. The cylindrical lining material 11 has a three-layer structure of an impermeable inner film layer, a resin-absorbing inner layer impregnated with a curable resin, and an impermeable outer film layer. Examples of the curable resin include a thermosetting resin, a photocurable resin, and a room temperature curable resin. The resin is impregnated into a resin-absorbing inner layer. Moreover, although a polyurethane film is used as an impermeable inner film layer and a polyethylene film is used as an impermeable outer film layer, it is not limited to these.

  In addition, a rigid or semi-rigid tubular lining material 11 molded from a thermoplastic resin is placed inside the existing pipe 2 using the technology disclosed in Japanese Patent Laid-Open Nos. 10-278113 and 6-293071. The lining pipe 10 may be formed and arranged by inserting and heating and softening the cylindrical lining material 11 and pressurizing and expanding the cylindrical lining material 11 against the inner wall of the existing pipe 2.

  When the cylindrical lining material 11 is inserted into the existing pipe 2, it is inserted over the entire length of the existing pipe 2 partitioned by the two human holes 3, and the cylindrical lining material 11 is inserted into the existing pipe 2. It is preferable to form and arrange the lining tube 13 according to the above.

  As another example of the lining pipe 10, as shown in FIG. 4, for example, the technique disclosed in Japanese Patent Laid-Open No. 10-82497 can be used to impregnate or apply an uncured curable resin. A certain sheet-shaped lining material 11a is wound around a repair machine, this repair machine is inserted into the existing pipe 2 and positioned so as to straddle the cutting portion 12 of the existing pipe 2, and the sheet-shaped lining material 11a is expanded by air pressure. Then, the lining pipe 10 is formed and disposed in the range from the tip of the existing pipe 2 to the cutting portion 12 of the existing pipe 2 by pressing the sheet-like lining material 11a against the inner wall of the existing pipe 2 and curing the curable resin. Can do.

  Although not shown, as another example of forming the lining pipe 10 and arranging it inside the existing pipe 2, for example, a belt-like member disclosed in Japanese Patent Publication No. 4-44153 and Japanese Patent Application Laid-Open No. 2003-191329 is used. The lining pipe 10 may be fed into the existing pipe 2 and arranged while the lining pipe 10 is formed by spiral winding by sequentially folding in the circumferential direction and joining the side ends of the band-shaped members together. Good.

  Next, as shown in FIG. 5, after disposing the lining pipe 10 inside the existing pipe 2, the distal end portion of the existing pipe 2 cut into the pipe hole 5 of the basic peripheral wall portion 4 a of the human hole 3 is cut. 2a is removed from the tube hole 5.

  Prior to the removal of the tip 2a of the existing pipe 2, in order to secure a work space necessary for the removal work of the tip 2a of the existing pipe 2, the invert concrete 13 on the front surface of the tip 2a of the existing pipe 2 is necessary. Just excise it. The range where the inverted concrete 13 on the front surface of the tip 2a of the existing pipe 2 is cut out is a space filled with an elastic material that absorbs the difference in movement between the existing pipe 2 and the peripheral wall 4 of the human hole 3, as will be described later. Also become. The removal of the tip 2a of the existing pipe 2 is not particularly limited, but is performed by drawing and crushing.

  Next, as shown in FIG. 6, an elastic water-stop tubular portion 14 that can be elastically deformed is provided in the gap obtained by removing the tip portion 2 a of the existing tube 2 from the tube hole 5 of the basic peripheral wall portion 4 a of the human hole 3.

  The elastic water-stop tubular portion 14 is formed using an elastic water-stopping material such as a water-expandable rubber material containing a soft resin such as silicon resin or soft epoxy urethane or a water-absorbing material. As means for providing the elastic water-stop tubular portion 14 in the space between the lining pipe 10 of the tube hole 5 of the basic peripheral wall portion 4a of the human hole 3 and the portion of the existing pipe 2 where the distal end portion 2a is cut off, an elastic water-stop material is used. The elastic water-stop tubular portion 14 having a thickness substantially equal to the wall thickness of the existing pipe 2 is formed, and the elastic water-stop tubular portion 14 is inserted into the gap between the tube hole 5 and the lining pipe 10. Alternatively, the elastic water-stopping tubular portion 14 may be formed by injecting an elastic water-stopping material into the gap between the tube hole 5 and the lining pipe 10.

  Further, the elastic water-stop tubular portion 14 may be adhered to the outer peripheral surface of the lining pipe 10 or may be pressed against the outer peripheral surface of the lining pipe 10. The elastic water-stop tubular portion 14 used in press contact with the outer peripheral surface of the lining pipe 10 is not shown in order to ensure sealing performance and slidability with the lining pipe 10, but the elastic water-stop tubular portion 14 is not shown. It is preferable to form a wavy inner surface.

  7, 8, and 9 show other examples of the elastic water-stop tubular portion 14. The elastic water-stop tubular portion 14 shown in FIG. 7 has a concave portion 14a and a convex portion 14b whose inner surfaces are annular in the axial direction. Are formed continuously, and the recess 14a is deeply cut. The elastic water-stop tubular portion 14 shown in FIG. 8 has a shape in which an inner surface is continuously formed with an annular concave portion 14a and a convex portion 14b in the axial direction, and the convex portion 14b is hollow. The elastic water-stop tubular portion 14 shown in FIG. 9 has a shape in which an inner surface is formed by continuously forming a concave portion 14a and a convex portion 14b that are annular in the axial direction, and is entirely hollow. These elastic water-stop tubular portions 14 shown in FIGS. 7, 8, and 9 are all excellent in sealing performance with the lining pipe 10 and axial stretchability, and can be bonded to the outer peripheral surface of the lining pipe 10. It may also be pressed. In any case, it is only necessary to stop water between the elastic water-stop tubular portion 14 and the inner wall of the tube hole 5 and between the elastic water-stop tubular portion 14 and the outer peripheral surface of the lining pipe 10.

  Thereafter, prior to the removal of the tip 2a of the existing pipe 2, in order to secure a work space necessary for the removal work of the tip 2a of the existing pipe 2, the invert concrete 13 on the front surface of the tip 2a of the existing pipe 2 is removed. Filled material 15 is filled into the cut portion of invert concrete 13 on the front surface of tip portion 2a of existing pipe 2 that has been cut only in a necessary range. The filler 15 is not particularly limited but is preferably an elastic material. In this example, an elastic material is used as the filler 15. As this elastic material, you may use the elastic water stop material which forms the elastic water stop tubular part 14, for example. Further, the step portions of the lining pipe 10 and the inverted concrete 13 are filled with a filler 16 such as resin or mortar and leveled. In this way, the process of implementing the seismic retrofitting method for the existing pipe manhole connection is completed.

  In the drawing, the seismicization of the existing pipe manhole connection 6 is shown in the drawing as a process of making the existing pipe manhole connection 6 on the left side of the figure, but the existing pipe manhole on the right side of the figure is shown. The connection portion 6 is also made earthquake resistant in the same process as described above.

  According to the earthquake resistance construction method of the existing pipe manhole connection part, the existing pipe 2 fitted in the pipe hole 5 of the basic peripheral wall part 4a of the human hole 3 is placed near the outer peripheral wall surface 9 of the basic peripheral wall part 4a. Since the cutter is cut at a position not exceeding the outer peripheral wall surface 9, the cutter does not protrude outside the basic peripheral wall portion 4 a of the human hole 3, and the underground cable exists close to the outer periphery of the basic peripheral wall portion 4 a of the human hole 3 by the cutter. There is no risk of damaging embedded objects such as embedded pipes for various fluids.

  Further, after arranging the lining pipe 10 inside the existing pipe 2, the cut end portion 2 a of the existing pipe 2 fitted in the pipe hole 5 of the basic peripheral wall portion 4 a of the human hole 3 is removed from the pipe hole 5. Since the existing pipe 2 is cut in the vicinity of the outer peripheral wall surface 9 of the foundation peripheral wall portion 4a at a position not exceeding the outer peripheral wall surface 9, the outer peripheral wall surface 9 of the basic peripheral wall portion 4a of the human hole 3 and the surroundings of the existing pipe 2 Between the outer peripheral wall surface 9 and the periphery of the existing pipe 2 can be prevented from flowing into the pipe hole 5 earth and sand outside the basic peripheral wall portion 4a of the human hole 3; The inflow of water can be prevented or minimized, and the operation can be easily performed.

  Further, the lining pipe 10 disposed inside the existing pipe 2 serves as the existing pipe 2, and the lining pipe 10 in the portion from which the existing pipe 2 is removed becomes the pipe hole 5 of the basic peripheral wall portion 4 a of the human hole 3. An end portion of the existing pipe 2 to be fitted is formed. And since the elastic water-stopping tubular portion 14 that can be elastically deformed is provided in the gap obtained by removing the distal end portion 2a of the existing pipe 2 from the pipe hole 5, when an earthquake occurs, the existing pipe constituted by the lining pipe 10 generated by the earthquake is provided. The difference in movement between the tube 2 and the peripheral wall 4 of the human hole 3 can be absorbed by the elastic water-stop tubular portion 14.

  That is, the difference in the vertical movement between the existing pipe 2 and the peripheral wall 4 of the human hole 3 is absorbed by the deformation in the thickness direction of the elastic water blocking tubular portion 14, and the peripheral wall 4 of the existing pipe 2 and the human hole 3. The difference in the axial movement between the elastic water-stop tubular portion 14 and the lining pipe 10 is that the elastic water-stop tubular portion 14 and the lining are caused by the axial deformation of the elastic water-stop tubular portion 14. When the pipe 10 is in pressure contact, it is absorbed by the axial deformation of the elastic water-stop tubular portion 14 and the sliding of the lining pipe 10 in the axial direction. As described above, when the elastic water blocking tubular portion 14 and the lining pipe 10 are in pressure contact with each other, the difference in the axial movement between the existing pipe 2 and the peripheral wall 4 of the human hole 3 is the same as that of the lining pipe 10. Since it is also absorbed by the slide, the difference in the axial movement between the existing pipe 2 and the peripheral wall 4 of the human hole 3 can be reliably absorbed even if the deformation rate of the elastic water-stop tubular portion 14 is small.

  The end surface of the elastic water-stop tubular portion 14 is closed by the filler 15 filled in the cut portion of the invert concrete 13 at the lower half thereof, and only the upper half is opened. Since the filler 15 is an elastic material, the lower half of the end face of the elastic water-stop tubular portion 14 is closed with the filler 15 made of an elastic material. As a result, the deformation of the lower half of the end surface of the elastic water-stop tubular portion 14 is absorbed by the filler 15 made of an elastic material, so that the lower half of the end surface of the elastic water-stop tubular portion 14 is also an open surface. It becomes equivalent and facilitates the deformation of the elastic water-stop tubular portion 14, whereby the difference in axial movement between the existing pipe 2 and the peripheral wall 4 of the human hole 3 can be more reliably absorbed.

  As described above, in this example, the cut portion of the inverted concrete 13 on the front surface of the end portion of the existing pipe 2 is filled with the filler 15 made of an elastic material, but the filler 15 is a hard material such as mortar. In this case, the end surface of the elastic water-stop tubular portion 14 is closed with a filler 15 made of a hard material at the lower half thereof, and the deformation of the elastic water-stop tubular portion 14 is caused by the deformation of the elastic water-stop tubular portion 12. It is absorbed by the deformation of only the upper half of the end face.

In addition, since the end of the existing pipe 2 after removing the tip 2a is in a position where the existing pipe 2 and the basic peripheral wall 4a of the manhole 3 can be easily broken when an earthquake occurs, Due to the difference in movement between the existing pipe 2 and the peripheral wall 4 of the manhole 3, the end of the existing pipe 2 fitted in the pipe hole 5 is easily broken, so that the existing pipe manhole connecting portion 6 is damaged. It is possible to prevent the destruction of the existing pipe 2, and the lining pipe 10 serves as the existing pipe 2 as described above, and the end of the existing pipe 2 fitted into the pipe hole 5 as described above. Since the end portion is constituted, even if the end portion of the existing pipe 2 is broken, the lining pipe 10 can sufficiently compensate for the damage, and there is no possibility that the function as the existing pipe 2 is impaired.

It is a longitudinal cross-sectional view which shows the state before construction in the process of the implementation of the earthquake resistance construction method of the existing pipe manhole connection part which concerns on this invention. It is a longitudinal cross-sectional view which shows the state which cut | disconnected the existing pipe fitted to the pipe hole of the peripheral wall of a human hole in the position which does not exceed an outer peripheral wall surface in the vicinity of the outer peripheral wall surface of a peripheral wall. It is a longitudinal cross-sectional view which shows the state which has arrange | positioned the lining pipe | tube inside the existing pipe | tube shown in FIG. It is a longitudinal cross-sectional view which shows the other example of a lining pipe | tube. It is a longitudinal cross-sectional view which shows the state which removed the front-end | tip part which the existing pipe fitted to the pipe hole of the surrounding wall of a human hole removed from the pipe hole after arrange | positioning a lining pipe inside the existing pipe. It is a longitudinal cross-sectional view which shows the state which provided the elastic water stop tubular part which can be elastically deformed in the space | gap which removed the front-end | tip part of the existing pipe | tube from the pipe hole. It is an expanded sectional view showing other examples of an elastic water stop tubular part. It is an expanded sectional view showing other examples of an elastic water stop tubular part. It is an expanded sectional view showing other examples of an elastic water stop tubular part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 2 Existing pipe 2a Tip part 3 Human hole 4 Circumferential wall 4a Foundation peripheral wall part 5 Pipe hole 6 Existing pipe human hole connection part 7 Opening part 8 Lid 9 Outer peripheral wall surface 10 Lining pipe 11 Cylindrical lining material 11a Sheet-like lining material 12 Cutting Part 13 Invert concrete 14 Elastic waterproofing tubular part 14a Concave part 14b Convex part 15, 16 Filler

Claims (1)

A seismic construction method for an existing pipe human hole connection part that aims to make the existing pipe human hole connection part quake-resistant by fitting the existing pipe to the pipe hole of the peripheral wall of the human hole,
The existing pipe fitted in the pipe hole of the peripheral wall of the human hole does not exceed the outer peripheral wall surface in the vicinity of the outer peripheral wall surface of the peripheral wall, and is easily destroyed when an earthquake occurs. A step of cutting at a position where the base peripheral wall portion can be cut off,
Arranging the lining pipe inside the existing pipe;
After disposing the lining pipe inside the existing pipe, removing the cut end of the existing pipe fitted into the pipe hole of the peripheral wall of the human hole from the pipe hole;
And a step of providing an elastically deformable elastic water-stop tubular portion in the gap obtained by removing the tip of the existing tube from the tube hole.

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