JP2002250471A - Back-filling structure of end part of inner lining for pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back-filling structure at the end part of inner liner for pipeline, which can surely seal the end of injection gap, without being influenced by the surface condition of an existing pipeline, raise the injection pressure of a filling material high and furthermore make the quality of a filling material after hardening stable and high. SOLUTION: Both ends of the tube-like member 2 of water-permeable material are pressure-connected by the hollow type enlarging diameter member 4a, 4b that is provided respectively on the inside at the end of the tube long direction of the inner lining material 1 and on the inside of existing pipeline P which is separated by a fixed distance to the outside of tube long direction from there, and the inlet gap of back filling material is sealed surely, by employing the construction with the inlet gate 5 of the back filling material close to the end of lining material 1 or the tube-like member 2. Thereby, the air and excess water can be discharged through the water-permeable material to the outside, at injection of the back-filling material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of repairing an existing pipeline such as a sewer pipe, by laying a lining material on the inner surface thereof, and providing a backing material in a gap between the lining material and the inner surface of the existing pipeline. The present invention relates to a structure for backfilling an edge of a lining material used in a method of injecting and curing.

[0002]

2. Description of the Related Art As a method of repairing an existing pipeline such as a sewer pipe,
Conventionally, a method is known in which a lining material is laid along the inner surface of an existing pipeline, and a backfill material such as mortar or cement milk is injected into a gap between the lining material and the inner surface of the existing pipeline and hardened. I have.

In this type of construction method, as disclosed in, for example, JP-A-63-88388,
Insert the injection hose into the cylindrical space formed between the inner surface of the existing pipeline and the lining material, and fill the openings at both ends in the length direction of the cylindrical space with mortar to perform the seaming. In this state, a method of injecting a backfill material into the cylindrical space through an injection hose is generally adopted.

[0004]

In a conventional method in which a backfill material is injected with the openings at both ends of the gap between the inner surface of the existing pipeline and the lining material filled with mortar, The backfill material cannot be injected until the mortar hardens, and the pressure at the time of injecting the backfill material into the voids may break the mortar liner. Had to be performed at low pressure. Further, if water flows on the inner surface of the existing pipeline, it is difficult to apply complete lining with mortar, and the backfill material may flow out of a part of the lining. For this reason, in the conventional construction method in which both ends of the voids are laid with mortar, there is a problem that the efficiency of the work of injecting the backfill material is low and a long time is required.

The present invention has been made in view of such circumstances, and the end of the void into which the backfill material is to be injected can be reliably formed without being affected by the inner surface condition of the existing pipeline such as the presence or absence of running water. For pipelines that can be sealed in a stable manner, can stably inject backfill material at high pressure, and can stably increase the quality of backfill material after curing. The purpose is to provide a structure for backfilling the edges of the lining material.

[0006]

In order to achieve the above-mentioned object, the backfill structure for the end of a pipe lining material according to the present invention is provided by using an inner surface of an existing pipe and a lining material laid inside the existing pipe. An end structure of a lining material for injecting a backfill material into a gap formed between the lining material and an inner surface of the lining material in a longitudinal direction end thereof, and an existing structure separated from the position by a predetermined distance outward in the longitudinal direction of the cylinder. Both ends of a tubular member made of a water-permeable material are pressure-fixed to the inner surface of the pipe by corresponding hollow enlarged members, and a backfill material is provided near the end of the lining material or the tubular member. It is characterized by the fact that an inlet is provided (claim 1).

Here, in the present invention, between the both ends of the tubular member and the inner surface of the existing pipeline or the inner surface of the lining material,
Alternatively, a structure in which a hollow elastic member is interposed between both ends of the cylindrical member and each hollow enlarged member (claim 2)
It is preferable to employ

In the present invention, the backing structure according to claim 1 or 2 is provided at one end of the lining material, and the other end has an inner surface at the other end and a cylinder length from the position. A structure in which both ends of a tubular member made of a water-permeable material are pressure-bonded and fixed to the inner surface of an existing pipeline at a predetermined distance outward in the direction by a corresponding hollow enlarged diameter member (Claim 3). can do.

Further, in the invention according to claim 3,
Between both ends of the tubular member provided on the other end side of the lining material and the inner surface of the existing pipeline or the lining material, or
It is preferable to adopt a structure in which a hollow elastic member is interposed between both ends of the cylindrical member and the hollow enlarged member (claim 4).

According to the present invention, a cylindrical member formed of a water-permeable material is used instead of filling both ends of a cylindrical space formed between an existing pipeline and a lining material with a hardening material such as mortar. The intended purpose is to be achieved by sealing both ends by crimping and fixing them to the inner surface of the existing pipeline and the inner surface of the end of the lining material with a hollow enlarged diameter member.

That is, in the present invention, a canvas made of, for example, a woven cloth is provided on the inner surface of the end of the lining material in the tube length direction and the inner surface of the existing pipeline at a certain distance outward from the position in the tube length direction. Both ends of a cylindrical member made of a water-permeable material such as are pressurized and fixed by using a hollow diameter expanding member to seal an end of a cylindrical gap formed between existing pipelines. Then, the backfill material is injected into the inner surface of the lining material in the vicinity of the sealing portion or into the cylindrical gap through the injection port provided in the cylindrical member.

Therefore, it is not necessary to wait for curing as in the case of filling with a curable material such as mortar, and the injection of the backfill material can be started immediately after sealing with the tubular member, and The sealing can be stably performed without being affected by the state of the inner surface of the existing pipeline such as the presence or absence of flowing water.

Further, the pressure of the backfill material can be increased by securely pressing both ends of the tubular member against the inner surface of the existing pipe and the inner surface of the end of the lining material by the hollow diameter expanding member. The backfill material does not leak from the seam,
The injection pressure can be increased, and the required time can be shortened.

Further, since a cylindrical member made of a water-permeable material is used as a member for sealing, surplus water or intrusion water from outside is injected through the sealing portion when the backfill material is injected. In addition, the formation of air pockets can be prevented, and the quality of the backfill material after casting can be improved.

As in the invention according to claim 2, both ends of the tubular member are not simply crimped to the inner surface of the existing pipeline and the inner surface of the end of the lining material by the hollow enlarged-diameter member. By interposing a hollow elastic member on the outer periphery or inner periphery, even if there are irregularities on the inner surface of the existing pipeline and the inner surface of the end of the lining material, it is deformed corresponding to these inner surfaces, and the crimp fixing portion of the tubular member In this case, the hermeticity can be easily ensured, and the workability can be improved, and at the same time, the injection pressure of the backfill material can be further increased.

Further, as in the third aspect of the present invention, the backing structure according to the first or second aspect of the present invention is provided at one end of the lining material, and these structures are provided at the other end. Equivalent structure, that is, both ends of the tubular member made of a water-permeable material, the inner diameter of the inner end of the lining material and the existing pipe inner surface separated by a predetermined distance in the length direction of the cylinder from that position by a hollow enlarged member respectively By constructing a structure that is fixed by crimping, it is possible to achieve the prevention of the discharge of surplus water or intrusion water for the entire length of the filling area of the backfill material and the formation of an air pocket from the sealing portion on the other end side. It is possible to significantly improve the quality of the backfill material after the casting.

[0017] Also in the cladding structure on the other end side, a hollow elastic member is interposed between the outer and inner peripheries of both ends of the cylindrical member as in the invention according to claim 4, so that the hollow expanding member is provided. It is possible to easily improve the tightness of the cylindrical member against the inner surface of the existing pipeline and the inner surface of the end of the lining material by the diameter member at the crimp-fixing part, thereby improving the workability and further increasing the pressure for filling the backfill material. can do.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration near an end of a lining material 1 according to an embodiment of the present invention.
Is an enlarged view of the main part. FIG. 3 is a view taken in the direction of the arrow A in FIG. 1. In FIG. 3, the illustration of the inner hollow enlarged diameter member 4a is omitted in order to avoid complication of the drawing.

In this embodiment, an existing pipeline P having a circular cross section is used.
It shows an example when the present invention is applied to
As schematically illustrated in FIG. 4, the manholes M1, M2
Inside the existing pipeline P, for example, a resin lining material 1
Are laid in a cylindrical shape. To describe an example of the laying structure of the lining material 1, a plurality of reinforcing rings made of steel or the like are arranged in parallel along the inner surface of the existing pipeline P, and each of the reinforcing rings is connected to a connecting member (all shown in FIG. Z)
Are connected in the lengthwise direction of the existing pipelines P, and the lining material 1 is fixed thereto.
Appropriate through-holes are formed so that the injected backfill material can flow in the cylinder length direction.

Now, the lining material 1 indicated by E1 in FIG.
As shown in FIGS. 1 and 2, one end of a cylindrical member 2 made of a water-permeable material is fixed to the inner surface of one end of the cylindrical member 2 by pressure bonding along the circumferential direction. The other end of 2 is similarly crimped and fixed along the circumferential direction to the inner surface of the existing pipeline P at a position outside the one end of the lining material 1 by a predetermined distance in the cylinder length direction. The crimp fixing structure will be described in detail. Hollow elastic members 3a and 3b are arranged on the inner surface of the end portion of the lining material 1 and the inner surface of the existing pipeline P, respectively.
Both ends of the cylindrical member 2 are respectively arranged along the inner surface circumferential direction of each of the hollow elastic members 3a and 3b, and the hollow enlarged members 4a and 4b are further arranged inside the cylindrical elastic members 3a and 3b, so that the cylindrical member 2 is moved from the inside. The diameter of the lining material 1 is increased through the hollow elastic members 3a, 3b
The tubular member 2 is pressed and fixed to each of these inner surfaces by pressing the inner surface of the cylindrical member 2 or the inner surface of the existing pipeline P.

The material of the tubular member 2 is a canvas made of a cloth such as woven fabric sewn into a tubular shape. One end of the tubular member 2 is the inner peripheral length of the lining material 1 and the other end is the material of the existing pipeline P. It is sewn according to the inner circumference. Further, as the tubular member 2, a canvas and sewing having a strength capable of withstanding the injection pressure of the backfill material described later are selected.

The hollow elastic members 3a and 3b are made of a single-cell sponge rubber or the like, and the specific material is such that the hollow elastic members 3a and 3b are filled with a backfill material.
There is no particular limitation because it is a temporary use product that is removed after curing, and a rubber-based material such as CR or a urethane-based material is suitable. Hardness is about Shore A25, moderately lining material 1
Flexibility corresponding to the unevenness of the inner surface of the
It is preferable because it has a rigidity that does not deform due to the injection pressure of the backfill material in response to the compression by the hollow enlarged diameter members 4a and 4b.

As a method of manufacturing the hollow elastic members 3a and 3b, the ends of the block-like members are joined together with an adhesive or the like, and the outer surface shape is adjusted to the existing pipe line P and the inner surface shape of the lining material 1. . The specific shape is a shape that matches the cross-sectional shape of the existing pipeline P, such as a ring shape if the cross-sectional shape of the existing pipeline P is circular as in the present embodiment and a horseshoe shape if the cross-sectional shape is a horseshoe shape. The thickness in the radial direction is 10mm
It is preferable to set it to the degree because an appropriate compression margin can be obtained. The diameter and width may be appropriately adjusted on site.

The hollow enlarged members 4a and 4b have the same structure as each other, and are divided into a plurality of steel rings 41a and 41b.
b and a plurality of jacks 42a, 42b. The structure will be described with reference to FIG. 3 with the outer hollow enlarged member 4b as a representative example. Each of the divided pieces 411b forming the steel ring 41b is slidably fitted to each other in the circumferential direction. And these are jack 4
They are interconnected by 2b. The same applies to the inner hollow enlarged diameter member 4a. In this example, each of the hollow enlarged-diameter members 4a and 4b has two sets of steel rings 41a and 41a or 41b and 41b arranged in parallel with each other in the cylinder length direction of the pipe P, such as bolts. The divided pieces 411a facing each other by the connecting member F,
411a or 411b and 411b are fixed to each other. And each jack 42a, 42
b are attached to the connecting member F via engaging members C provided at both ends thereof, and the jacks 42a, 42b
By expanding and contracting the two steel rings 41a,
41a or 41b and 41b are simultaneously expanded in diameter.

As described above, each of the hollow enlarged diameter members 4a, 4b
Is constructed using two steel rings 41a, 41a or 41b, 41b, respectively, so that it can be easily and correctly installed vertically without being inclined when installed in a pipeline. However, each hollow enlarged member 4a, 4
Even if each of b is constituted by a pair of steel rings 41a and 41b, by properly installing vertically in the pipeline,
The same operation and effects as those of this embodiment can be exhibited. Here, similarly to the hollow elastic members 3a, 3b, the contour shape of the hollow enlarged members 4a, 4b has a ring shape when applied to a pipe having a circular cross section as in this embodiment. When applied to a horseshoe-shaped pipeline, the shape should conform to the shape of the existing pipeline P, such as a horseshoe. Here, the hollow enlarged diameter members 4a and 4b are not limited to the above structure, and may be, for example, an inflatable bag such as a tire tube.
The diameter of the cylindrical member 2 may be expanded by injecting air into the inside.

The tubular member 2 is provided with a plurality of backfill material injection ports 5. The back-filling material injection port 5 can be made of any component that can be connected to the end of a back-filling material injection hose (not shown), and may be made of metal or resin. As a structure for mounting the backfill material inlet 5 to the cylindrical member 2 as shown in FIG. 2, the backfill material inlet 5 is provided at one end of the flange portion 5a via a pipe joint or the like. A long sleeve 5b engraved with an external thread is formed so that a hose can be connected, and a short sleeve 5d engraved with an external thread into which a nut 5c is screwed is formed on the other end side. . On the other hand, a hole is formed in the cylindrical member 2 so that the short sleeve 5 of the backfill material injection port 5 is formed.
d is inserted into the hole, and the nut 5c is screwed into the short sleeve 5d in a state where the flange portion 5a is along the surface of the cylindrical member 2, so that the cylindrical member 2 is moved between the nut 5c and the flange portion 5a. Sandwich it. It is preferable that the periphery of the hole of the cylindrical member 2 is fixed with an adhesive so that the yarn does not fray, or the hole is opened with a trowel to fuse the yarn.

A method of constructing the above-mentioned end structure will be described. The tubular member 2 and the hollow elastic members 3a and 3b or the hollow enlarged members 4a and 4 for constructing the end structure.
b, etc., from the manhole M1 shown in FIG.
Carry in. First, the hollow elastic member 3a is arranged on the inner surface of the end portion of the lining material 1, and the hollow elastic member 3b is arranged on the inner surface of the existing pipeline P away from the inner side of the existing pipe P by a predetermined distance in the tube length direction. At this time, it is preferable that the hollow elastic members 3a and 3b are temporarily fixed with an adhesive tape or the like. Next, one end of the tubular member 2 made of a water-permeable material is slightly protruded to the far side (inside) beyond the inner hollow elastic member 3a, and the other end is positioned closer to the outer hollow elastic member 3b. It is arranged to protrude to the side (outside). Also in this case, both ends of the tubular member 2 are connected to the hollow elastic members 3a,
It is preferable from a work point of view to temporarily fix with an adhesive tape or the like along the inner peripheral surface of 3b. A plurality of backfill material inlets 5 are attached to the tubular member 2 in advance.

After that, the inner hollow enlarged diameter member 4a is assembled inside one end of the cylindrical member 2, and the jack 42a is operated to increase the diameter, and the hollow elastic member 3 is inserted through the cylindrical member 2.
By compressing and deforming a, one end of the tubular member 2 is fixed to the inner surface of the lining material 1 by pressure bonding. Next, the outer hollow enlarged diameter member 4b is assembled inside the other end of the cylindrical member 2, the jack 42b is operated to increase the diameter, and the hollow elastic member 3b is compressed and deformed via the cylindrical member 2. Thus, the other end portion of the tubular member 2 is press-fitted and fixed to the inner surface of the existing pipeline P, whereby the end structure shown in FIG. 1 is obtained.

The existing pipeline P indicated by E2 in FIG.
The other end is preferably sealed with an end structure having a structure equivalent to the above-described end structure and not having only the backfill material injection port 5, and the other end E2 is also sealed. In this state, a hose is connected to each backfill material inlet 5 to perform a backfill material injection operation. At this time, it is not necessary to wait for the hardening of the sealing material as in the conventional method of sealing each end with a curable material such as mortar, and the injection of the backfill material is started immediately after the end structure is constructed. In addition, even if water flows on the inner surface of the existing pipeline P, it can be reliably sealed. Further, since the sealing member is formed of the tubular member 2 made of a water-permeable material, When the backfill material is injected, air and surplus water are discharged to the outside via the tubular member 2, and the quality of the backfill material after curing is stabilized, and the reliability is improved. Further, since the ends of the lining material 1 are securely press-fixed to the inner surface of the existing pipe P and the inner surface of the lining material 1 at both ends of the tubular member 2 by the diameter expansion of the hollow enlarged members 4a and 4b. Also, the injection pressure of the backfill material can be significantly increased as compared with a case where both ends of the pipeline are sealed with a mortar or the like, and the working efficiency can be improved.

After the backfill material is cured, the hollow enlarged members 4a and 4b, the hollow elastic members 3a and 3b, and the tubular member 2 are removed. In order to improve the workability at the time of removal, it is preferable to coat and apply a release material in advance on the portion in contact with the backfill material since the backfill material can be easily removed without being integrated.

Here, in the above embodiment, the hollow elastic members 3a and 3b are arranged on the outer surface side of the cylindrical member 2 and the backfill material inlet 5 is provided in the cylindrical member 2. However, in the present invention, each hollow elastic member 3
a and 3b may be arranged on the inner surface side of the tubular member 2, and the backfill material inlet 5 may be provided in the lining material 1. FIG. 5 and FIG.

FIG. 5 shows an example in which the cylindrical member 2 is crimped and fixed to the inner surface of the existing pipeline P.
A hollow elastic member 3b is arranged on the inner surface side of the member, and a hollow enlarged member 4b is arranged inside the elastic member 3b.
The cylindrical member 2 is fixed to the inner surface of the existing pipeline P by pressure bonding via the hollow elastic member 3b. In FIG. 5, a hollow elastic member 3a is arranged on the outer surface side of the end of the tubular member 2 on the side that is pressure-fixed to the inner surface of the lining material 1 in the same manner as in the previous example. 2, a hollow enlarged diameter member 4a is arranged on the inner surface side.

In the example shown in FIG. 6, hollow elastic members 3a and 3b are arranged on the inner surface of both ends of a cylindrical member 2 and hollow elastic members 4a and 4b provided inside the hollow elastic members 3a and 3b. Both ends of the tubular member 2 are fixed to the inner surface of the lining material 1 or the inner surface of the existing pipeline P by press-fitting via 3a and 3b.

5 and 6, the backfill material injection port 5 is provided in the lining material 1 near the end of the cylindrical member 2. The attachment of the backfill material inlet 5 to the lining material 1 may have the same structure as the attachment to the tubular member 2 described above, or a female screw may be formed on the lining material 1 itself by tapping, and one end may be formed. It is also possible to adopt a structure in which a pipe formed with an external thread is screwed with a pipe or the like.

5 and 6, the hollow elastic member 3b is disposed on the inner surface side of the tubular member 2 at the portion where the tubular member 2 is fixed to the existing pipe P by pressure bonding. The structure in which the end portion is sealed in a state where the outer surface of the tubular member 2 is directly adhered to the existing pipeline P is to discharge the air accumulated in the upper portion of the pipeline from the tubular member 2 made of a water-permeable material. This is preferable because the backfill material can be completely filled in the pipeline. By the way, in the previous example shown in FIGS.
Since there is a possibility that air may accumulate by the thickness of the hollow elastic member 3b, when the existing pipeline P is inclined, the backfill material inlet is provided at the lower end to allow air to be injected when the backfill material is injected. It is preferable to consider discharging upward.

Also, as shown in the examples of FIGS. 5 and 6, when the backfill material injection port 5 is provided at the end of the lining material 1, excess air or backfill material is removed from the tubular member 2 made of a water-permeable material. This is more preferable because water is easily discharged.

In each of the above embodiments, the hollow elastic members 3a, 3a and 3b are respectively attached to the inner surface of the end of the lining material 1 at both ends of the tubular member 2 and the crimp-fixed portions to the inner surface of the existing pipeline.
3b, an example is shown in which the irregularities on the inner surface of the existing pipeline P and the inner surface of the lining material 1 are absorbed to ensure the sealing easily. However, there are few irregularities on each of these inner surfaces. If not, it is not always necessary to provide the hollow elastic members 3a and 3b, and it is possible to appropriately select the use of these members according to the state of the irregularities on each inner surface and the like.

[0038]

As described above, according to the backfill structure for the end of the pipe liner according to the present invention, the inner surface of the end of the liner is separated from the position by a predetermined distance in the cylinder length direction. On the inner surface of the existing pipeline, both ends of the tubular member made of a water-permeable material are fixed by crimping from the inside by hollow enlarged members, respectively.
Since the backing material injection port is provided in the tubular member or the lining material in the vicinity thereof, when injecting the backing material into the gap between the existing pipeline and the lining material, a curable material such as a conventional mortar is used. Without waiting for the lining material to harden, as in the case of lining between the end of the lining material and the existing pipeline,
The filling work of the backfill material can be started immediately, and the filling end of the backfill material can be securely sealed without being affected by the condition of the inner surface of the existing pipeline such as running water. The injection pressure of the filling material can be greatly increased as compared with the related art, and the working efficiency can be improved. In addition, since the cylindrical member used for the sealing portion uses a water-permeable material, air and surplus water can be discharged to the outside when the backfill material is injected, and the quality of the backfill material after curing is improved. You can also.

According to the second aspect of the present invention, if a configuration is adopted in which both ends of the cylindrical member are pressure-fixed to the existing pipe or the inner surface of the lining material with the hollow elastic member interposed therebetween, Even if there are irregularities on the inner surface of the existing pipeline or lining material,
The sealing can be easily ensured, and the injection pressure of the backfill material can be further increased.

Further, as in the invention according to claims 3 and 4, the end structure of the invention according to claim 1 or 2 is provided at one end of the lining material and the invention according to claim 1 or 2 is provided at the other end. By constructing a structure in which only the backfill material injection port is removed from the end structure, it is possible to reliably seal both ends of the backfill material injection space, as well as air traps and excess air over the entire length of the injection space. It is possible to discharge water or intrusion water from inside and outside the pipeline, and it is possible to achieve a significant improvement in the quality of the backfill material that has been placed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration near an end of a lining material according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a view taken in the direction of arrow A in FIG. 1 and omitting the illustration of an inner hollow enlarged diameter member 4a.

FIG. 4 is an explanatory diagram of the entire configuration of an existing pipeline P to which the embodiment of the present invention is applied and its lining material 1;

FIG. 5 is a cross-sectional view showing a configuration near an end of a lining material according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a configuration near an end of a lining material according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lining material 2 Cylindrical member 3a, 3b Hollow elastic member 4a, 4b Hollow expanding member 5 Backfill material inlet P Existing pipeline

Claims (4)

[Claims] 1. An end structure of a lining material for injecting a backfill material into a gap formed between an inner surface of an existing pipeline and a lining material laid inside the existing pipeline, the lining material being a tube. Both ends of a tubular member made of a water-permeable material are pressure-bonded to the inner surface of the longitudinal end portion and the inner surface of an existing pipe at a predetermined distance outward from the position by a hollow diameter expanding member corresponding to each. A backfill structure for an end portion of a lining material for a pipeline, wherein a backfill material injection port is provided near an end portion of the lining material or in the cylindrical member. 2. A hollow elastic member is provided between both ends of the tubular member and the inner surface of the existing pipeline or the inner surface of the lining material, or between both ends of the tubular member and each hollow enlarged member. The structure for backfilling an end of a pipe liner according to claim 1, wherein a member is interposed. 3. The backfill structure according to claim 1 or 2 is provided on one end side of the lining material in the cylinder length direction, and on the other end side,
Both ends of a tubular member made of a water-permeable material are crimp-fixed to the inner surface of the other end and the inner surface of an existing pipeline at a predetermined distance outward from the position in the lengthwise direction of the tube by the corresponding hollow enlarged members. The structure for backfilling an end portion of a lining material for a pipeline according to claim 1 or 2, wherein the end portion is provided. 4. A member between the both ends of a tubular member provided at the other end of the lining material and an inner surface of an existing pipeline or an inner surface of the lining material, or both ends of the tubular member and a hollow enlarged member. The structure for backfilling an end portion of a pipe liner according to claim 3, wherein a hollow elastic member is interposed between the liner and the end.