JP2008149599A - Construction method for tubular lining material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular lining material diametral expansion method which enables uniform diametral expanding of a tubular lining material introduced into an existing pipe across the entire region and can achieve the stable application of the tubular lining material and its uniformity. <P>SOLUTION: The construction method for the tubular lining material includes a process to insert a tube 20 for diametral expansion into the tubular lining material 10 in a non-expansion state, and an expansion operation process to expand the inserted tube 20 inside the tubular lining material 10. The tube 20 for diametral expansion has the outer diameter during the maximum expansion, which enables internal press-expanding of the tubular lining material 10 so as to allow the tubular lining material 10 to come into contact with the inner wall of the existing pipe 100. Thus, the tube 20 performs the operation to press-expand the tubular lining material 10 in a planar contact state, and consequently, it is possible to restrain the non-uniform partial deformation of the tubular lining material 10 in the planar contact state or the unnecessary deformation caused by the excess follow-up of the lining material 10 along the contour of the existing pipe. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tubular lining material installation method, and more particularly to a tubular lining material installation method for accurately installing a thermoplastic tubular lining material in an existing pipe.

  The sewerage penetration rate in Japan is 67% on average, and in urban areas, it is close to 100%. Therefore, most of the new sewage pipe construction projects have been eliminated except in some regions, and the maintenance of old pipes is now important. The total length of sewage pipes is approximately 360,000 km, of which pipes that have exceeded the service life of 50 years are over 7000 km. In the future, it is expected to increase by several thousand kilometers per year.

  In general, for pipes buried in the ground such as sewer pipes, it is inevitable that various deformations due to the passage of years since installation, for example, generation of steps due to deviation or change in diameter, etc. will occur. In addition, even if no deformation occurs, replacement is necessary with aging. Under such various circumstances, existing pipes require some kind of repair at a predetermined time.

  As a technique for repairing the existing pipe, there is a method of rehabilitating the existing pipe while leaving the ground unopened.For example, first, an uncured tubular lining material is reversed by compressed air or pulled into the existing pipe. Introduce. The tubular lining material is formed, for example, by impregnating a predetermined core with a reinforcing core material such as glass fiber. Next, compressed air is blown into the inner side of the lining material, the outer wall surface of the lining material is brought into close contact with the inner wall surface of the pipe, and then the tubular lining material is cured by light irradiation or the like from the inner side of the lining tube, to the inner wall surface of the existing pipe. A repair method is known in which an impermeable lining pipe is formed to rehabilitate an existing pipe.

  In addition, as the irradiation light used for such repair, ultraviolet rays having a high energy and a short resin curing time are well known, but visible light having a longer wavelength than that has a good light transmission property and an irradiation device. It is used appropriately due to its advantages such as being inexpensive.

  In Patent Document 1, a flexible sleeve formed by encapsulating an ultraviolet curable resin layer containing an unsaturated polyester resin and styrene with an outer film and an inner film is introduced into an existing pipe and compressed into the sleeve. An existing pipe lining method is disclosed in which air is caused to flow into close contact with the inner wall of an existing pipe, and the resin is cured by irradiating an ultraviolet ray to an uncured sleeve while moving the ultraviolet irradiation device in the sleeve.

  In addition, in the lining method using the lining tube formed of the photo-curing resin (also the thermosetting resin as described above), the resin material once cured cannot be softened again. On the other hand, in a construction method using a thermoplastic resin (for example, vinyl chloride, PE (polyethylene), PP (polypropylene), etc.) as the lining pipe, the lining pipe once cured can be re-softened by reheating. For example, in Patent Document 2 and Patent Document 3, such a thermoplastic lining pipe is used, and a tubular lining material is introduced into an existing pipe in a state where the cross-sectional shape is deformed to an omega shape, and in that state, A technique for expanding the diameter by blowing and softening steam is disclosed.

Patent No. 3005208 JP 2001-232684 JP 2003-127231 A

  As described above, conventionally, when repairing an existing pipe, a tubular lining material is used, and the tubular lining material is introduced into the existing pipe regardless of whether it uses a photocurable resin or a thermoplastic resin. Then, the operation | movement which expands this by introduce | transducing pressurized air or a vapor | steam is employ | adopted. That is, the diameter of the tubular lining material is expanded so as to be in close contact with the existing pipe by blowing a pressurized gas (air, steam, etc.) directly, and then a curing operation by light or heat or a curing operation by cooling is performed. .

  Therefore, since the pressurized gas is blown directly, if the existing pipe is cracked or if there is a gap in the joint of the existing pipe, the soft tubular lining material is pushed into the crack or gap. There is a risk that it will be in a closed state.

  FIG. 12A shows such a state. When a gap is generated for some reason at the joint of the existing pipe 100 to be repaired as shown in the figure, the diameter of the tubular lining material 200 is increased. A strained portion 200a that expands and enters the gap portion is generated, and a uniform diameter expansion cannot be obtained. Regarding the thickness, the strained portion 200a is thinner than the other portions. Therefore, the portion pushed into the crack or gap has a shape and thickness that is not uniform with other portions of the tubular lining material.

  Further, when the tubular lining material is introduced into the existing pipe, a pulling operation or a reversing operation is used, and the tubular lining material may be damaged due to unevenness in the existing pipe during the introduction. In such a case, as shown in FIG. 5B, when the pressurized gas is directly blown into the tubular lining material 200, the pressure of the pressurized gas is concentrated on the scratched portion, and the portion is limited. There is a risk of breakage due to elongation. Further, the diameter is expanded as it is, and the diameter expansion is completed while the thickness is not uniform.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to make it possible to uniformly expand the diameter of the tubular lining material introduced into the existing pipe in the entire region, and to stabilize the installation of the tubular lining material. An object of the present invention is to provide a method for expanding the diameter of a tubular lining material that can achieve homogenization and homogenization.

In order to achieve the above object, the tubular lining material diameter increasing method according to claim 1,
In the tubular lining material diameter expansion method in which the tubular lining material introduced into the existing pipe to be repaired is expanded in diameter in the existing pipe and closely adhered to the inner wall of the existing pipe, the outer diameter at the time of maximum expansion is the inner diameter of the tubular lining material from the inside. Inserting a tube for expanding the diameter of the tubular lining material in an unexpanded state into the tubular lining material in a non-expanded state, and expanding and inserting the tube for expanding the tube. And expanding the inside of the tubular lining material, and expanding the diameter of the tubular lining material by the expanding step of the diameter expanding tube.

  According to this configuration, the tubular lining material is partially deformed or excessively formed into the shape of the existing pipe, as in the case where the tubular lining material is expanded in diameter by pressurized air or the like introduced into the inside as in the conventional case. Unnecessary deformation that follows can be prevented. That is, since the diameter of the tubular lining material is expanded through the expansion operation of the diameter expansion tube, the tubular lining material is expanded in a surface contact state by the outer peripheral surface of the diameter expansion tube. Therefore, the tubular lining material is restricted from being unnecessarily expanded and invaded into the concave portions such as cracks and seams existing in the existing pipe in the tubular lining material. Therefore, installation of the tubular lining material into the existing pipe is performed with a uniform shape.

The tubular lining material diameter increasing method according to claim 2 is:
In the step of expanding the diameter of the tubular lining material, the diameter of the tubular lining material is expanded within a range not pressed against the inner wall of the existing pipe in order to facilitate the insertion of the diameter expansion tube into the introduced tubular lining material. Including a diameter expansion operation, after the provisional diameter expansion operation, the diameter expansion tube is inserted, and thereafter, the diameter expansion operation of the tubular lining material is performed by expansion of the diameter expansion tube.

  Thereby, the insertion operation of the tube for diameter expansion performed after this can be made easier. That is, since the tubular lining material introduced in the softened state is in a non-circular state with a narrow internal space, it is difficult to insert an object into the tubular lining material. By performing a temporary diameter expansion operation for expanding the diameter to some extent, the internal space is expanded and insertion is facilitated.

The tubular lining material diameter increasing method according to claim 3 is:
The tube for expanding the diameter is inserted into the tubular lining material before the tubular lining material introduction step. In this configuration, the diameter expansion tube is inserted into the tubular lining material at a predetermined stage of the manufacturing process of the tubular lining material, and this is wound by a winding means or the like. And in the repair site of the existing pipe, the operation | movement which draws in the existing pipe as it is in the tubular lining material in the state by which the tube for diameter expansion was inserted is performed. Therefore, it is not necessary to perform the operation of inserting the diameter expansion tube in a narrow space at the enforcement site.

The tubular lining material diameter increasing method according to claim 4 is:
The expansion operation of the diameter expansion tube is performed by blowing a pressure gas into the diameter expansion tube, and the pressure gas can raise the temperature of the tubular lining material through the diameter expansion tube. It has a temperature. As described above, according to the expansion operation of the diameter expansion tube by blowing the pressure gas, it is possible to perform the expansion of the uniform diameter expansion tube without any deviation, and the tubular by the surface contact of the outer peripheral surface of the diameter expansion tube. Accurate diameter expansion of the lining material is achieved. Moreover, since the pressure gas has a temperature that can raise the temperature of the tubular lining material via the tube for expanding the diameter, the temperature of the tubular lining material is cured during the diameter expanding operation, and the degree of softening is insufficient. Therefore, it is possible to prevent the hindrance to the diameter expansion operation.

The tubular lining material diameter increasing method according to claim 5 is:
The pressurized gas includes steam. Thereby, the diameter expansion tube can be expanded at a stable temperature at all times, and the simplification of the control relating to the blowing of the pressurized gas is achieved.

The tubular lining material diameter expanding method according to claim 6 is:
The tubular lining material is formed of a thermoplastic resin. If it is a tubular lining material made of a thermoplastic resin, it can be re-softened by heating after curing, and the lining pipe diameter increasing method according to any one of claims 1 to 6 can be applied more easily. That is, even after the diameter expansion operation of the tubular lining material using the diameter expansion tube is once cured, it can be repeated, and the accuracy of the diameter expansion of the tubular lining material can be improved.

The tubular lining material diameter increasing method according to claim 7 is:
The diameter expansion tube is configured as a short partial diameter expansion tube for expanding the diameter of only a part of the introduced tubular lining material.

  According to this configuration, since the diameter expansion tube is a short partial diameter expansion tube, the diameter expansion operation of the tubular lining material can be performed for each part. Therefore, the diameter of the tubular lining material can be increased several times, and when the entire expanded diameter extends over a long distance, the diameter expanding operation can be facilitated and smoothed. In addition, after the diameter has been expanded once and the installation of the tubular lining material has been completed, when a partially insufficiently expanded portion is found, the tubular lining material is made of a thermoplastic resin. Therefore, it is not necessary to re-expand the entire diameter, and the diameter can be expanded again for each individual portion.

  According to the tubular lining material diameter-enlarging method according to the present invention, the tubular lining material introduced for the repair in the existing pipe can always be uniformly expanded, and the stability and homogeneity of the tubular lining material after installation can be ensured. Can be achieved. That is, by directly expanding the diameter of the tubular lining material through the expansion operation of the diameter expansion tube inserted into the tubular lining material, the compressed air is directly blown into the tubular lining material. It is possible to avoid following the partial deformation of the tubular lining material as in the case of expanding the diameter or the excessive shape of the existing inner wall of the pipe. Thereby, the reliability of the repair work of the existing pipe | tube by introduction | transduction of a tubular lining material improves.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, a case where repair of a sewage main pipe between manholes is performed using a thermoplastic tubular lining material will be described as an example. As shown in FIG. 1, a main pipe 100 that is an existing pipe to be repaired is formed between vertical shafts 200 and 300 called so-called manholes. In carrying out the repair, as a preparatory step, a damming member 101 is installed upstream of the manhole 200 to block the upstream side of the main pipe 100, and is a general drainage introduction path existing in the middle of the main pipe 100. A damming member 401 is also installed on the upstream side of the mounting pipe 500 extending from 400 and 400.

  FIG. 1 shows an example of the process of introducing the tubular lining material 10 in such a repair operation of the sewage main pipe 100. As shown in the drawing, the uncured tubular lining material 10 is not yet expanded in a tube shape, and is drawn into the main tube 100 in a slightly flat shape such as an omega cross section. This pull-in operation is a pulling operation of a pulling means (not shown) installed on the ground part on the manhole 300 side with the tubular lining material 10 stored in a state wound around the roller on the storage part 12 on the manhole 200 side. Is drawn into the main pipe 100. The pulling means is equipped with a pulling rope or the like, and is fixed to the distal end portion 10 a of the tubular lining material 10. The tubular lining material 10 is pulled into the main pipe 100 from the manhole 200 side to the manhole 300 side by being pulled by the tow rope.

  As another example of introducing the tubular lining material 10 into the main pipe 100, the tubular lining material 10 is not pulled as it is, but is pushed into the main pipe 100 while being reversed from the tip side. It is also possible to use this introduction method. As shown in the drawing, the introduction process ends when the tubular lining material 10 is introduced to the entire area of the sewer main 100 to be repaired.

  FIG. 2 shows an example of the state of the tubular lining material 10 introduced into the existing pipe 100. The cross-sectional shape when introduced in the softened state as shown in the figure is not circular, and the internal space becomes narrow. The situation is in an omega shape. In this state, since it is difficult to insert an object into the tubular lining material 10, a temporary diameter expansion operation is performed to expand the tubular lining material 10 in this state to some extent. This diameter expansion operation does not always have to be performed, and is not necessary depending on the state of the introduced tubular lining material 10. That is, when the tubular lining material 10 in the introduced state has a cross-sectional shape that has a space that does not hinder the insertion of the diameter expansion tube described later, the diameter of the tubular lining material 10 is increased without performing temporary diameter expansion. A tube may be inserted. Further, when the diameters of the existing pipe 100 and the tubular lining material 10 are small, the tubular lining material 10 can be introduced into the existing pipe 100 without being deformed until the omega shape is obtained. Even in this case, the temporary diameter expansion operation is not necessary.

  First, in order to make the tubular lining material 10 an appropriate length from the introduction state of FIG. 1, both ends are cut | disconnected. And a valve is attached to both ends in order to blow in the internal pressurized gas and expand the diameter. In FIG. 3, valves 16 and 18 are attached to both ends of the tubular lining material 10. The injection side valve 16 is provided with an inlet 16a for injecting pressurized gas, and the outlet side valve 18 is provided with an outlet 18a. In the operation stage of the temporary diameter expansion, the discharge port 18a is closed.

  The pressurized gas blowing means includes, for example, a part installed on the ground in the vicinity of the manhole 200 to generate steam and a pump that sends the generated steam to the blowing port 16a through the hose 17 in a pressurized state. A pressurized gas supply device 19 is used. The pressurized gas blown from the blowing port 16a is not limited to steam, but when a tubular lining material using a material having a softening point of about 70 ° C. is used, the softened gas of the tubular lining material 10 in a softened state is used. It is preferable to use steam in order to perform temporary diameter expansion while maintaining a softened state or softening to an appropriate softened state. In this manner, the temporary diameter expansion operation is performed until the internal space in which the other objects can be easily inserted into the tubular lining material 10 before the completely expanded state is obtained.

  FIG. 4 shows the step of inserting the tube for expanding the diameter after the tubular lining material 10 is brought into the temporary expanded state. As shown in the figure, the valves 16 and 18 are removed after the temperature is lowered by temporarily expanding the tubular lining material 10 and maintaining the shape of the tubular lining material 10 by blowing cold air instead of steam. And the tube 20 for diameter expansion is in the state inserted in the tubular lining material 10 using the drawing means etc. in the tubular lining material 10 of a temporary diameter expansion state. FIG. 5 shows the cross-sectional shapes of the existing pipe 100, the tubular lining material 10, and the diameter expansion tube 20 in a state where the diameter expansion tube 20 is inserted. As shown in the figure, the tubular lining material 10 is not yet in a fully expanded diameter and cured state, and is not in a state of being in close contact with the inner wall of the existing tube 100. Further, the diameter expansion tube 20 is not expanded in the tubular lining material 10.

  The diameter-expanding tube 20 needs to have a strength that can be sufficiently expanded by the internal pressure and can reliably prevent the occurrence of breakage during expansion. Therefore, an elastomer or the like (including a film) excellent in heat resistance and expandability is used as a material, and a material reinforced by mixing a fiber material inside is preferable. Further, in order to facilitate the removal operation of the diameter expansion tube 20 after the diameter expansion operation, the outer peripheral surface of the tube lining material 10 is the same as the inner peripheral surface of the tubular lining material 10 even when heated to a temperature exceeding 70 ° C. by steam. A material that does not adhere is selected.

  The diameter-expanding tube 20 only needs to have an outer diameter that can press the tubular lining material 10 against the inner wall surface of the existing pipe 100 from the inside during maximum expansion, and may be made of any stretchable or non-stretchable material. .

  In addition, it is preferable to perform a softened state confirmation step of confirming the softened state of the tubular lining material 10 as necessary before performing such a step of inserting the diameter expansion tube 20.

  If it is confirmed by this softening state confirmation step that the softening degree necessary for smoothly performing the subsequent diameter expansion step is not obtained, a suitable softening state is again obtained by blowing steam or the like. Therefore, the smoothness of the final diameter expansion operation of the tubular lining material 10 by the diameter expansion tube 20 performed thereafter can be ensured.

  FIG. 6 shows a process of expanding the inserted diameter expanding tube 20. As shown in the drawing, in order to perform the expansion operation by introducing the pressurized gas into the diameter expansion tube 20, the length necessary for performing the expansion work is set in the manhole so as to be an optimum length. It cut | disconnects to the length made to protrude, and the valve | bulb 22 for injection | pouring and the valve | bulb 24 for exhaust_gas | exhaustion are attached to both ends. Here, in the present embodiment, steam is used as the pressurized gas, and steam is blown from the pressurized gas supply device 19.

  FIG. 7 shows a cross-sectional shape of the diameter expansion tube 20 during the expansion operation, and it is understood that the diameter of the tubular lining material 10 is expanded as the diameter expansion tube 20 expands by blowing steam. Is done. That is, the diameter-expanding tube 20 expands when steam is blown, and its outer surface comes into contact with the tubular lining material 10, so that heat due to the steam is transmitted to the tubular lining material 10. As a result, the temperature of the tubular lining material 10 rises, and when the temperature exceeds a softening point (for example, about 70 ° C.), the tubular lining material 10 softens again. And when the diameter expansion tube 20 is further expanded, it is pushed outward. This pushing operation is performed while maintaining the surface contact state on the outer surface of the diameter expansion tube 20. Therefore, a uniform force can be applied to the tubular lining material 10 over a wide range, and non-uniform deformation of only a specific portion of the tubular lining material 10 is prevented.

  In addition, the pressure of the vapor | steam blown in is set to about 0.05 MPa, for example. In addition, the pressurized air for the expansion operation of the diameter expansion tube 20 is not limited to steam, but the temperature of the tubular lining material 10 decreases during the expansion operation, the degree of softening decreases, and the diameter expansion It is preferable to use a pressurized gas at such a temperature that moderate heat is indirectly transmitted to the tubular lining material 10 through the diameter expansion tube 20 so as not to hinder the work.

  When the material of the tubular lining material is not a thermoplastic resin as in the present embodiment but a light or thermosetting material, the expansion of the diameter expansion tube 20 is not steam, but is tubular during expansion. Ordinary pressurized air that does not cure the lining material will be used.

  FIG. 8 is a sectional view in the axial direction of the existing pipe 100. In the joint portion of the existing pipe 100, the expansion operation of the diameter expansion tube 20 has progressed, and as a result, the diameter expansion operation of the tubular lining material 10 has been almost completed. The state of the tubular lining material 10 and the diameter expansion tube 20 is shown. As shown in the drawing, the tubular lining material 10 is pushed by the outer surface of the diameter expanding tube 20 and is in close contact with the inner wall surface of the existing pipe 100, but on the other hand, it enters the seam X portion of the existing pipe. It is understood that a uniform thickness is ensured.

  9 is a cross-sectional view in a direction perpendicular to the axial direction of the existing pipe 100, and FIG. 10 is an axial cross-sectional view showing the entire existing pipe 100 to be repaired. The same as FIG. The state where the diameter expansion process is almost completed is shown. As illustrated, the tubular lining material 10 is in close contact with the inner wall surface of the existing pipe 100 accurately by the diameter expansion operation of the diameter expansion tube 20. When the pressurized gas is blown directly into the tubular lining material 10 as in the prior art, there is a high possibility that the tubular lining material 10 follows the gaps, scratches and steps on the existing tube side. However, since the indirect diameter expansion in the surface contact state is performed by the expansion operation of the diameter expansion tube 20, even if there are gaps, scratches or steps in the existing pipe 100, it can follow it more than necessary. It is suppressed. That is, when the diameter of the tubular lining material 10 is expanded by expanding the diameter expansion tube 20 and the tubular lining material 10 enters the gap or the like, the pressure is extremely high so that it is not normally used. This is a situation where gas is blown. By blowing pressurized gas that does not have such a high pressure, the tubular lining material 10 can be almost completely prevented from entering the gap.

  As described above, after the diameter expansion operation of the tubular lining material 10 by the expansion operation of the diameter expansion tube 20 is completed, the step of removing the diameter expansion tube 20 is performed. First, from the state shown in FIGS. 8 to 10, cool air (or normal outside air) may be sent into the diameter expansion tube 20 for cooling. Then, when the temperature of the tubular lining material 10 is lowered to such an extent that the diameter of the tubular lining material 10 can be sufficiently expanded, the diameter expansion tube 20 is removed. The diameter-expanding tube 20 is flexible even when the temperature is lowered, and is formed thin. Therefore, the diameter-expanding tube 20 can be peeled off from the tubular lining material 10 and pulled out of the existing pipe 100 as it is. Removal from 100 is complete.

  FIG. 11 shows an embodiment in which the diameter expansion tube is configured as a partial diameter expansion tube 50 whose length in the tube axis direction is shortened. As shown in the figure, the partial diameter expansion tube 50 has a short configuration capable of expanding only a part of the tubular lining material, not the length over the entire length of the tubular lining material 10 installed in the existing pipe. Yes. Except for the short configuration, the configuration is the same as the configuration of the diameter expanding tube 20 shown in FIGS. 3 to 10 described above, and the description thereof is omitted by giving the same reference numerals. In the present embodiment, the injection valve 22 and the exhaust valve 24 are smaller in diameter than those in the above-described embodiment in which the entire diameter is expanded simultaneously, and can be easily introduced into an existing pipe. It is planned.

  According to the embodiment using the partial diameter expansion tube 50, the diameter expansion operation of the tubular lining material 10 is sequentially performed partially, and the entire diameter of the tubular lining material 10 to be installed in a plurality of steps can be increased. When the tubular lining material 10 extends over a long distance, it is possible to facilitate and smooth the operation of blowing pressurized gas.

  In addition, what is characteristic is that when the tubular lining material 10 is made of a thermoplastic resin and can be softened again by reheating, the tubular lining material is once expanded in diameter. After the installation of 10 is finished, it is possible to perform a partially complementary diameter-expanding operation. For example, when the inspection of the installation state is performed after the installation of the tubular lining material 10 and a location where the diameter expansion is insufficient is found, the diameter expansion operation is partially performed again, and quick correction can be performed. It is possible. It is not necessary to redo the entire diameter expansion for partial correction, and it is possible to quickly correct a portion where the diameter expansion is insufficient. The diameter expansion operation of the tubular lining material 10 by the partial diameter expansion tube 50 is the same as that of the above-described embodiment.

  In addition, this invention is not limited to said each embodiment, A various deformation | transformation is possible within the range of the summary of invention. The expanding tube can be made of an elastic material, but it is also preferable to use a material such as a resin that does not stretch so as to reach the inner wall of the existing tube at the time of maximum expansion. That is, as long as the diameter expansion tube does not rupture, there is no possibility of the tubular lining material entering the gaps of the existing pipe, and therefore the function of uniformly expanding the tubular lining material is effectively exhibited.

It is explanatory drawing which shows one process of embodiment of this invention, and has shown the state which introduce | transduced the tubular lining material in the existing pipe (sewer main) which is a repair object. The schematic sectional drawing of the direction orthogonal to the axial direction of the existing pipe in the state shown in FIG. 1 is shown. It is explanatory drawing which shows one process of embodiment of this invention, and has shown the state which diameter-expanded the tubular lining material introduced in the existing pipe (sewer main pipe). It is explanatory drawing which shows one process of embodiment of this invention, and has shown the state which inserted the tube for diameter expansion in the tubular lining material temporarily expanded in the existing pipe (sewer main pipe). . The schematic sectional drawing of the direction orthogonal to the axial direction of the existing pipe in the state shown in FIG. 4 is shown. It is explanatory drawing which shows 1 process of embodiment of this invention, and has shown the state which is expanding the diameter expansion tube inserted in the tubular lining material. The schematic sectional drawing of the direction orthogonal to the axial direction of the existing pipe in the state shown in FIG. 6 is shown. It is a schematic sectional drawing of the axial direction of the existing pipe which shows the state of the tubular lining material in the seam part of the existing pipe in the state where the diameter expansion of the tubular lining material was completed by the expansion operation of the tube for diameter expansion. FIG. 9 is a schematic cross-sectional view in a direction perpendicular to the axial direction of an existing pipe in the state shown in FIG. 8. It is explanatory drawing which shows the state of the whole area of the existing pipe of the repair object in the state shown in FIG. It is explanatory drawing which shows embodiment using the short tube for partial diameter expansion. (A) And (B) is explanatory drawing for showing the subject in the diameter expansion operation | movement of the tubular lining material using the conventional pressurized gas.

Explanation of symbols

10 Tubular Lining Material 20 Diameter Expansion Tube 16 Injection Side Valve 18 Discharge Side Valve 22 Injection Valve 24 Exhaust Valve 50 Partial Diameter Expansion Tube 100 Existing Pipe 200,300 Manhole

Claims (7)

In the tubular lining material diameter expanding method in which the tubular lining material introduced into the existing pipe to be repaired is expanded in diameter in the existing pipe and closely adhered to the inner wall of the existing pipe.
An outer diameter of the tubular lining material in an unexpanded state in the non-expanded state has an outer diameter that allows the outer diameter of the tubular lining material to be expanded from the inside so that the tubular lining material is brought into close contact with the inner wall of the existing pipe. Inserting into,
Expanding the inserted diameter-expanding tube within the tubular lining material,
The tubular lining material diameter-enlarging method, wherein the diameter of the tubular lining material is expanded by an expansion step of the diameter expansion tube. The diameter expansion process of the tubular lining material,
In order to facilitate the insertion of the diameter expansion tube into the introduced tubular lining material, including a provisional diameter expansion operation for expanding the tubular lining material in a range not pressed against the inner wall of the existing pipe,
3. The tubular lining material according to claim 2, wherein after the temporary diameter expansion operation, the diameter expansion tube is inserted, and thereafter, the diameter expansion operation of the tubular lining material is performed by expanding the diameter expansion tube. Diameter expansion method. The operation of inserting the tube for expanding the diameter into the tubular lining material is as follows:
The method for expanding the diameter of a tubular lining material according to claim 1, wherein the method is performed before the tubular lining material introduction step. The expansion operation of the diameter expansion tube is as follows:
It is performed by blowing a pressure gas into the diameter expansion tube,
The tubular lining material diameter-expanding according to any one of claims 1 to 3, wherein the pressure gas has a temperature capable of raising the temperature of the tubular lining material via the diameter-expanding tube. Method.   The tubular lining material diameter-enlarging method according to any one of claims 1 to 4, wherein the pressure gas is steam.   The tubular lining material diameter-enlarging method according to any one of claims 1 to 5, wherein the tubular lining material is formed of a thermoplastic resin. The diameter expansion tube is
The tubular lining material diameter-expanding according to any one of claims 1 to 6, wherein the tubular lining material diameter-expanding tube is configured as a short partial diameter-expanding tube for expanding the diameter of only a part of the introduced tubular lining material. Method.

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