JP3850423B2 - Lining method for the inner surface of existing piping - Google Patents

Description

  The present invention relates to a lining method for repairing (coating) the inner surface of an existing pipe with a lining material.

  For example, in power generation facilities, most of the piping is buried underground (in the concrete), but even if water leaks from the piping due to aging, it is difficult to replace the piping with new ones. is there.

  In view of this, the existing pipes that have been aged have been repaired from the inner surface, and conventional methods for repairing the inner surface of the existing pipes include a resin lining method, a hose lining method, an FRP inner surface repair method, and the like.

  The resin lining method is a method for relatively thin tubes (for example, the diameter is 200 mm or less), and is a method in which the coating material (epoxy resin) is sprayed from the opening at one end of the piping with a high-pressure air flow to adhere the coating material to the inner surface of the piping. is there.

  The hose lining method is a method in which the lining tube is inserted into the pipe while being reversed with air pressure from one end opening of the pipe, and the lining tube is attached to the inner surface of the pipe with an adhesive. In addition, as a well-known example of this hose lining construction method, there exist Unexamined-Japanese-Patent No. 2000-94521 (patent document 1), Unexamined-Japanese-Patent No. 2001-221368 (patent document 2), etc., for example.

  The FRP inner surface repair method is a method used for partial repair of large diameter pipes that a person puts into a pipe such as a sewage pipe. An FRP (synthetic resin) molded product molded into the shape of the inner surface of the pipe is carried into the large diameter pipe. In this method, the FRP molded product is applied to an aging part (for example, a water leakage part) of a large-diameter pipe from the pipe inner surface to repair the part.

JP 2000-94521 A JP 2001-221368 A

  However, the conventional methods for repairing the inner surface of each existing pipe have the following problems.

  The above-mentioned resin lining method can be applied only to relatively thin tubes (for example, the diameter is 200 mm or less), and has only a coating with only a paint (epoxy resin), so the pressure resistance is low. Further, when there is a water leak hole on the pipe wall, the water leak hole cannot be repaired sufficiently, and when water has entered the pipe from the water leak hole, the water leak hole cannot be closed with the coating resin.

  In the above-mentioned hose lining method, the lining tube is directly used as a coating material for the inner surface of the pipe. However, if the pressure resistance is applied to the coating material part, the lining tube is made of a tough material (for example, thickening the fabric, It is necessary to use the one in which the reinforcing fiber is embedded. However, when such a tough fabric lining tube is used, the stretchability and flexibility of the fabric are reduced, and the functions such as expansion or reversal in the piping cannot be fully exhibited, resulting in poor workability. In addition, a large-capacity air pressure generator is required. On the other hand, in the case of using a lining tube made of a thin fabric, the stretchability and flexibility are good and the workability is excellent, but the pressure resistance after construction is low. Also, in this hose lining method, when a branch pipe is connected to the existing pipe, the branch pipe connection portion is blocked by the lining tube, so post-processing (lining tube excision work of the branch pipe connection portion) Is very troublesome.

  In the above FRP inner surface repair method, an FRP molded product is carried into a large-diameter pipe, and the inner surface of the pipe is partially repaired with the FRP molded product, but the target pipe is limited to a large-diameter pipe that a person can enter. In addition, it is difficult to specify repair parts (water leakage parts, cracked parts, etc.). In addition, if the entire pipe is aged due to aging, it is expected that there will be places that require repairs one after another, and each time the pipe function (water flow) is stopped, the repair work is performed. There is a need to do.

  In view of the problems of the conventional existing pipe repair method described above, the present invention can repair the inner surface of the pipe with high strength regardless of the diameter of the existing pipe, and can reuse the lining material in the pipe many times. The purpose is to provide a lining method for the inner surface of existing piping.

  The present invention has the following configuration as means for solving the above problems. The present invention is directed to a lining method for repairing existing piping from the inner surface of the pipe.

The invention of claim 1 of the present application The lining method of the invention of claim 1 of the present application is a method suitable mainly for repairing the inner surface of one single pipe having no branch pipe. In addition, the pipe to be repaired may have not only a horizontal part but also an inclined part, a vertical part, a curved pipe part, a different diameter part, and the like.

  The lining method according to claim 1 uses a cylindrical mesh that is knitted into a cylindrical shape having a mesh with fibers, has an outer diameter that is substantially the same as the inner diameter of the piping, and has approximately the same length as the piping. Inserted in a state corresponding to the entire length range of the pipe from one end opening, injecting an uncured lining material into one end opening of the tubular net inserted into the pipe, and of the cylindrical net injecting the uncured lining material From one end opening, insert a lining tube that expands due to fluid pressure and advances while the tip side is reversed in order, and fills the mesh in the entire circumferential direction of the cylindrical mesh while pressing the uncured lining material forward Then, with the lining tube inserted into the entire length of the piping, hold the inside of the lining tube until the uncured lining material is cured, and after the lining material is cured, reverse the lining tube and remove it from the piping. By taking, it is characterized by forming a tubular network containing cured lining layer on the inner peripheral surface of piping.

  The fluid pressure supplied into the lining tube may be high-pressure water, but generally compressed air is used. In the following description, the fluid pressure is referred to as compressed air.

  As the fiber of the tube network, a flexible, stretchable and durable material (for example, aramid fiber) is used. And this cylinder network is knitted beforehand corresponding to the internal diameter, length, etc. of the existing piping which should be repaired. The cylindrical net has a mesh formed on the entire length and the entire circumferential surface, and the size of the mesh can be appropriately designed as long as the lining material can be filled in the mesh.

  The lining material is initially flexible (uncured) and has a property of curing with time. An epoxy resin can be used as the lining material.

  When the lining tube is inserted into the tube and compressed air is fed into the tube, the lining tube has a function of expanding and advancing the tip of the tube by reversing. The lining tube used in the present application is not a final coating material (it will be extracted later), so a relatively thin film material may be used, but it is highly stretchable and peels off from the lining material. It is made of a material having properties (for example, natural rubber or silicon rubber).

  In the lining method according to claim 1 of the present application, first, a tubular net is inserted into the pipe from an end (one end side) opening of the existing pipe. In this insertion method, the guide rope is passed through the entire length of the existing pipe. By connecting one end of the guide rope to one end of the tubular net and pulling the free end of the guide rope (the end opposite to the tubular net connecting portion) from the other end opening of the pipe, It can be pulled in over the entire length. The both ends of the cylinder network drawn into the pipe are fixed to the end edges of the pipe, respectively.

  Next, a predetermined amount of uncured lining material is injected into one end opening of the tubular net inserted in the pipe. The injection amount of the uncured lining material is set in consideration of the inner diameter / length and the coating thickness of the pipe, but a considerably larger amount than the actual amount applied to the inner surface of the pipe is injected. Further, the uncured lining material is injected in a state in which the entire area of the pipe opening is closed because it is applied to the entire circumference of the inner surface of the pipe.

  Next, when the lining tube is entered by compressed air from one end opening of the cylinder network into which the uncured lining material is injected, the tip of the lining tube moves forward while being reversed, thereby pushing the uncured lining material forward. At the same time, it is gradually filled into the mesh of the cylinder network.

  And when the front-end | tip part of a lining tube protrudes slightly from the other end opening of piping, supply of compressed air is stopped and the inside of a lining tube is maintained as it is. In addition, when the inside of the lining tube is maintained, the uncured lining material is pressed over the entire circumference of the pipe inner surface because the lining tube body is expanded. This holding pressure is continued until the uncured lining material in the pipe is cured. Even if the pipe has a water leak hole and is immersed in the pipe, the pipe lining can be processed by using a lining material that is curable in water.

  Then, after the lining material in the pipe is cured, when the lining tube is reversely inverted and the lining tube is extracted from the pipe, a cured lining layer with a tubular net is formed over the entire length of the inner peripheral surface of the pipe. Since the tubular net is embedded in the lining layer, the cured lining layer with a tubular net is strong even without a lining tube. Further, the extracted lining tube can be diverted to another pipe repair work.

  If the pipe has a different diameter portion (tapered connecting portion), the entire inside of the pipe can be applied neatly by performing the lining operation from the large diameter side. Moreover, even if the pipe has a curved pipe portion, the insertion of the tubular net and the entry of the lining tube can be performed without difficulty.

Invention of Claim 2 The lining method of the invention of claim 2 is a method of repairing the inner surface of an existing pipe having a main pipe and a branch pipe across the main pipe and the branch pipe.

  In the lining method of claim 2, the main cylinder net part knitted into a cylindrical shape having a mesh with fibers and having the same outer diameter as the main pipe and the same length as the main pipe and the inner diameter of the branch pipe are substantially the same. A tube network having a branch tube network portion having a diameter substantially the same as that of the branch tube is used. In the lining method of claim 2, the fiber material of the cylinder network, the material of the uncured lining material, the configuration of the lining tube, and the like are the same as those used in claim 1.

  The lining method according to claim 2 is a state in which the cylinder network is from one end opening of the pipe, the main cylinder network part corresponds to the full length range in the main pipe, and the branch cylinder network part corresponds to the full length range in the branch pipe. The uncured lining material is injected into one end opening of the main tube net and the end opening of the branch tube net, respectively, and one end opening of the main tube net is injected with each uncured lining material. And a lining tube which is expanded by compressed air and advances while the tip side is sequentially reversed from the end opening of the branch cylinder network part, respectively, while pressing the uncured lining material forward, Fill the mesh in the entire circumferential direction of the branch tube network part, and hold the inside of each lining tube until the uncured lining material is cured with each lining tube inserted into the entire length of the main pipe and branch pipe, respectively. After each lining material in the main pipe and the branch pipe is cured, each lining tube is reversely inverted and pulled out from the main pipe and the branch pipe, so that a cured lining layer with a cylindrical net is continuous with each inner peripheral surface of the main pipe and the branch pipe. It is characterized by forming.

  To insert a tube network with a branch tube network into a pipe with a branch pipe, insert a guide rope through the entire length of the main pipe part of the pipe and the part from the end opening of the branch pipe to the one end opening of the main pipe. The leading end of each guide rope is connected to one end of the main tube net portion of the tube net and the end of the branch tube network portion, respectively, and the free end side of each guide rope is pulled, respectively. The cylindrical net part can be drawn into the main pipe, and the branched cylindrical net part can be drawn into the branch pipe. In addition, after inserting a cylinder network in piping, it is confirmed with a fiber scope whether the branch cylinder network part is correctly positioned in the branch pipe part.

  Next, the uncured lining material is injected into the one end opening of the main tube net and the end opening of the branch tube net, respectively, and the uncured lining material is respectively injected into the main tube net and the branch tube net with the lining tube. However, in practice, the lining operation is performed with a time difference between the main pipe portion and the branch pipe portion. Specifically, the branch pipe side is performed first, and the pressure is maintained at a position where the tip of the lining tube on the branch pipe side slightly faces the main pipe, and then the lining tube on the main pipe side is inserted. To do. Then, the inside of the lining tube is held in a state where the lining tube on each side is inserted in the entire length of each of the main pipe and the branch pipe, and after the lining material on each side is cured, each lining tube is inverted in the reverse direction. By extracting the lining tube from the inside of the main pipe and the branch pipe, a cured lining layer with a tubular net is formed over the entire length of the pipe across the main pipe and the branch pipe. A small amount of burrs (extrusion of the cured lining material) may remain on the inner surface of the connecting portion between the branch pipe and the main pipe, but this burr can be removed with a tool from the end opening of the branch pipe.

  In the lining method according to the second aspect, even if the pipe has a branch pipe, a hardened lining layer containing a tubular net can be formed continuously on the inner surface of the main pipe and the inner face of the branch pipe.

Advantageous Effects of Invention of Claim 1 In the lining method for the existing pipe inner surface according to claim 1 of the present application, a tough tube-lined cured lining layer can be formed on the inner surface of a pipe (single pipe) to be repaired. Moreover, the lining tube used for the lining operation in the pipe only needs to have a function of simply pressing the uncured lining material against the inner surface of the pipe, so that a relatively thin film material may be used as long as it has elasticity. Therefore, the reversing (advancing) action of the tip of the lining tube and the expanding action of the lining tube body are performed reliably, and the coating workability of the uncured lining material is improved. Further, since the lining tube is later extracted from the inside of the pipe, there is an effect that the lining tube can be diverted to a lining operation for another pipe inner surface.

Effect of the Invention of Claim 2 In the lining method of the inner surface of the existing pipe according to claim 2 of the present invention, even in a pipe with a branch pipe obtained by branching the branch pipe from the main pipe, a series of operations spans the main pipe and the branch pipe. Thus, a continuous cured lining layer with a cylindrical net can be formed.

  Therefore, in addition to the effect of the first aspect, the lining method according to the second aspect can perform lining without difficulty even in a pipe with a branch pipe, and can form a continuous lining layer containing a tubular net over the entire surface of the pipe. effective.

  Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. FIGS. 1 to 8 show a lining method for the inner surface of an existing pipe according to the first embodiment, and FIGS. The lining method of the inner surface of the existing piping of an Example is shown. The lining method of the first embodiment corresponds to claim 1 and the lining method of the second embodiment corresponds to claim 2.

First Embodiment The lining method of the first embodiment shown in FIGS. 1 to 8 is a method suitable for repairing the inner surface of one existing pipe 1 having no branch pipe. In addition, in the 1st Example of FIGS. 1-8, although the straight pipe is employ | adopted as the piping 1 which should be repaired, the lining construction method of this application is what has a curved pipe part and a different diameter part in the middle of piping. Is also applicable. Moreover, the lining method of this application is applicable to the existing piping 1 of a suitable internal diameter and length. Then, the pipe 1 to be repaired is embedded in the ground as shown in FIG. 1, and the connecting pipes connected to both ends are separated, and both ends of the pipe 1 are opened (reference numerals 1a, 1a, 1b) Let it go.

  In the first embodiment, a tubular net 2 (FIG. 1) serving as a core material of an in-pipe lining layer, an uncured epoxy resin 3 (FIG. 4) serving as a lining material on a pipe inner surface, and an uncured epoxy resin 3 are piped. The lining apparatus 4 (FIGS. 4 to 8) for coating the inner surface is used.

  As shown in FIG. 1, the cylindrical net 2 is knitted into a cylindrical shape having a mesh with fibers, and has an outer diameter substantially the same as the inner diameter of the pipe 1 and substantially the same length as the pipe 1. In this embodiment, a flexible, stretchable, and durable aramid fiber is used as the fiber of the tubular net 2. The tubular net 2 is previously knitted into a shape corresponding to the inner diameter and length of the existing pipe 1 to be repaired.

  The cylindrical mesh 2 has a mesh formed on the entire length and the entire circumferential surface thereof. The size of the mesh can be appropriately designed as long as the uncured lining material 3 can be filled in the mesh. Further, the thickness of the aramid fiber forming the tube network 2 can be appropriately selected according to the desired thickness (desired pressure strength) of the tubed lining layer B (FIG. 8) to be formed in the tube. The thickness of the tubular netted lining layer B to be formed in the pipe 1 is determined by the pipe diameter of the pipe 1 or the desired pressure strength, but is usually set in the range of 0.5 to 3 mm. The thickness of the fiber for the net 2 is also set accordingly.

  The epoxy resin 3 serving as a lining material is initially flexible (uncured), but has a property of curing within one day when it is thinly extended.

  As shown in FIGS. 4 to 8, the lining device 4 has a single lining tube 42 folded back in a length direction in a casing 41 and wound around a shaft core in a flat state. For the lining tube 42, a relatively thin film material rich in stretchability is used. Further, the lining tube 42 is formed of a material (for example, natural rubber or silicon rubber) having a property of peeling from the lining material because it is necessary to peel off the cured lining material as will be described later.

  And this lining apparatus 4 supplies the compressed air to the casing 41 through the air pipe 46, and as shown in FIGS. 5-7, while expanding the trunk | drum 43 of the lining tube 42, the lining tube front-end | tip part 44 is made. It can be reversed (advanced). The basic structure of the lining device 4 is the same as that conventionally used in the hose lining method although the application is different.

  The lining method of the first embodiment shown in FIGS. 1 to 8 is performed as follows.

  First, the tubular net 2 is inserted into the pipe 1 from the one end opening 1a of the existing pipe 1. This insertion method is performed by passing the guide rope 5 through the entire length of the pipe 1 as shown in FIG. 5 is connected to one end 2b of the tubular net 2, and the free end 5b side of the guide rope 5 is pulled from the other end opening 1b of the pipe 1, so that the tubular net 2 is connected to the pipe 1 as shown in FIG. Pull in over the entire length. Then, both ends of the tubular net 2 are fixed to the end edges of the pipe 1 in a state where the tubular net 2 is stretched in the length direction as indicated by dotted lines in FIG. At this time, it is advisable to confirm with a fiberscope or the like whether or not the tubular network 2 is twisted in the pipe 1. In addition, when the pipe 1 is long, the upper surface side of the intermediate part of the cylindrical net 2 inserted into the pipe 1 may hang down by its own weight. Since it progresses while expanding the tubular net 2 outward in the radial direction, the work can be performed without any trouble.

  Next, as shown in FIG. 4, a predetermined amount of uncured epoxy resin (lining material) 3 is injected into one end opening 2 a of the tubular net 2 inserted in the pipe 1. The injection amount of the uncured epoxy resin 3 is set in consideration of the inner diameter and length of the pipe 1 and the coating thickness. However, the injection amount is considerably larger than the actual amount applied to the inner surface of the pipe. To do. Further, the uncured epoxy resin 3 is injected in a state in which the entire area of the pipe opening 1a is closed because it is applied to the entire circumference of the inner surface of the pipe.

  And after inject | pouring the unhardened epoxy resin 3 in the one end opening 2a of the cylinder network 2, the lining apparatus 4 is installed as shown in FIG. That is, the lining device 4 is installed such that the tip 44 of the lining tube 42 corresponds to the one end opening 1 a of the pipe 1 in a state where the lining tube 42 is fully reduced.

  Next, as shown in FIG. 5, when compressed air A is supplied from the air pipe 46 of the lining device 4, the distal end portion 44 of the lining tube 42 moves forward while being inverted, so that one end opening 1 a (cylinder network 2) The uncured epoxy resin 3 in the end opening 2a) is sequentially pushed forward and pushed outward, and the uncured epoxy resin 3a pushed to the outside is sequentially filled in the mesh of the cylindrical net 2 It will be done. The filling (coating) of the uncured epoxy resin 3 into the mesh is performed on the entire peripheral surface of the pipe. In addition, since the uncured epoxy resin 3 is pressed outward by the lining tube 42 that expands in this way, even if the pipe 1 has a water leak hole, the water leak hole should be filled with the uncured epoxy resin 3. Is possible. Further, when a lining material (epoxy resin) 3 having an underwater curing property is used, the lining process in the pipe can be performed even in a state where the pipe is submerged from the leak hole.

  As shown in FIG. 6, the pipe 43 has a bulging diameter of the barrel 43 of the lining tube 42, so that the outer surface of the lining tube trunk 43 is An uncured lining layer B containing the tubular net 2 is formed over the entire circumference between the pipe 1 and the inner surface.

  Then, as shown in FIG. 7, when the lining tube tip 44 slightly protrudes from the other end opening 1b of the pipe 1, the supply of the compressed air A is stopped and the inside of the lining tube 42 is maintained as it is. In addition, when the lining tube front-end | tip part 44 protrudes from the other end opening 1b of the piping 1, the excess unhardened epoxy resin which was not applied to the pipe inner surface is extruded from the other end opening 1b of this piping. The pressure holding in the lining tube 42 is performed by closing the valve 47 of the air pipe 46. The pressure in the lining tube 42 can be measured with a pressure gauge 48. If the pressure in the lining tube 42 drops during pressure holding, the valve 47 is opened and the compressed air A is introduced into the lining tube 42 through the air pipe 46. refill.

  The holding pressure in the lining tube 42 is continued until the uncured epoxy resin 3a applied in the pipe 1 is cured. The uncured epoxy resin 3a coated in the pipe 1 is cured within one day. Then, after the coated epoxy resin in the pipe 1 is cured, the lining tube 42 is reversed and the lining tube 42 is pulled out from the pipe 1 as shown in FIG. 8 (the lining tube 42 is wound up in the casing 41). A hardened lining layer B with a tubular net is formed over the entire length of the inner peripheral surface of the pipe. Since the tubular net 2 serving as a core is embedded in the epoxy resin layer 3a, the cured lining layer B with a tubular net is strong even without a lining tube. In addition, the thickness of the lining layer B with the cylinder net formed in the pipe 1 is actually in the range of about 0.5 to 3 mm, but in FIGS. 5, 7, and 8, the structure is discriminated. In order to make it easy, the thickness of the lining layer B with the cylinder net is described as being considerably thick.

  As shown in FIG. 8, in a state where the lining operation on the inner surface of the pipe is finished and the lining tube 42 is removed from the pipe 1, both ends of the tubular net 2 are exposed at the opening edge of each end of the pipe 1. (Reference numerals 2c and 2c), after the lining work on the inner surface of the pipe is completed, the exposed portions 2c and 2c at both ends of the tubular net are cut out cleanly. Further, the lining tube 42 extracted from the pipe 1 can be diverted to another pipe repair work.

  When a lining process with a high pressure resistance is required, the above lining process can be repeated twice. In another embodiment, an epoxy resin may be further coated on the inner surface of the tubular netting cured lining layer B formed in the pipe by a method such as pigling.

  In the above-described lining method, when the pipe 1 has a different diameter portion (having a tapered connection portion in the middle), the cylindrical net 2 also has a large length range corresponding to the diameter of the large diameter pipe portion. The diameter range and the length range of the small-diameter pipe portion are made small according to the diameter, and the tube network 2 is inserted from the large-diameter side of the pipe 1 so that the lining operation by the lining tube 42 is performed from the large-diameter side. Good. In that case, since the lining tube 42 has elasticity in the radial direction, even a single tube can correspond to both the large diameter portion and the small diameter portion of the pipe 1. Even if the pipe 1 has a curved pipe portion, the insertion of the tubular net 2 and the entry of the lining tube 42 can be performed without difficulty.

  In the lining method according to the first embodiment, the hardened lining layer B containing the tubular net 2 serving as the reinforcing core material can be formed over the entire circumference and the entire length in the pipe 1, so that the inner surface of the pipe can be formed as in the conventional hose lining method. In addition, a tough (high pressure resistance) lining layer can be formed without leaving a lining tube.

Second Embodiment The lining method of the second embodiment shown in FIGS. 9 to 16 repairs the inner surface of the existing pipe 10 having the main pipe 11 and the branch pipe 12 across the main pipe 11 and the branch pipe 12. It is a construction method.

  In the lining method of the second embodiment, as shown in FIG. 9, the fiber is knitted into a cylindrical shape having a mesh, and has the same outer diameter as the main pipe 21 and the same length as the main cylindrical net portion 21. A cylinder network 20 having a main cylinder network part 21 and a branch cylinder network part 22 having substantially the same outer diameter and the same length as the branch pipe 12 is used. The connecting portion of the branch tube network portion 22 in the tube network 20 opens into the main tube network portion 21, and the inside of the branch tube network portion 22 communicates with the inside of the main tube network portion 21. When the branch pipe 12 of the pipe 10 is thinner than the main pipe 11, the branch cylinder network portion 22 is knitted to a small diameter according to the thin branch pipe 12.

  In the lining method of the second embodiment, the fiber material of the tubular net 20 (aramid fiber), the material of the uncured lining material 3 (epoxy resin), the configuration of the lining device 4 and the like are the same as those used in the first embodiment. The same. Further, the lining operation into the pipe 10 is performed in two directions by dividing the main pipe 11 portion and the branch pipe 12 portion, and two lining devices 4 are used. In this second embodiment, the pipe 10 to be repaired has only one branch pipe 12 connected to the main pipe 11, but two or more branch pipes 12 are connected to the main pipe 11. It can also be applied to those that have been made. In that case, the tubular network 20 is knitted in a configuration corresponding to the number and position of the branch pipes 12 of the pipe 10.

  The lining method of the second embodiment is performed as follows.

  First, the pipe network 20 with the branch pipe network portion 22 is inserted into the pipe 10 with the branch pipe 12, and this insertion method is performed by inserting a guide rope (main main pipe 11 into the main pipe 11 of the pipe 10 as shown in FIG. The other end of the branch pipe 12 is led from the end opening 12 a of the branch pipe 12 to the one end opening 11 a of the main pipe 11. Next, one end 5a of the guide rope 5 for pulling in the main tube net part is connected to one end 21b of the main tube net part 21 of the tube net 20, and one end 6a of the guide rope 6 for pulling in the branch tube net part is connected to the branch tube network. It connects to the end of the part 22. Then, the free ends 5b and 6b side of the guide ropes 5 and 6 are pulled from the other end opening 11b of the main pipe 11 and the end opening 12a of the branch pipe 12, respectively, and the tubular network 20 is piped as shown in FIG. Pull into 10. In the state shown in FIG. 10, the main tube network portion 21 of the tube network 20 corresponds to the entire length range in the main tube 11 of the pipe 10, and the branch tube network portion 22 of the tube network 20 is the entire length in the branch tube 12 of the tube 10. It is inserted in a state corresponding to the range. Then, both ends of the tubular net 2 (both end portions 11a of the main tubular net portion 21) in a state where the tubular net 20 (the main tubular net portion 21 and the branched tubular net portion 22) are extended in the length direction in the pipe 10. , 11b and the end 22a of the branch tube network 22 are fixed to each end edge of the pipe 1, respectively. At this time, whether or not the tube network 2 (the main tube network portion 21 and the branch tube network portion 22) is twisted in the pipe 1 (the main tube 11 and the branch tube 12), and the branch tube network portion 22 is accurately piped. It is confirmed with a fiber scope whether it is located at the branch portion of 1.

  Next, the inside of the main pipe 11 and the inside of the branch pipe 12 are lined. In this second embodiment, as shown in FIGS. 11 and 12, the branch pipe 12 portion is first performed. That is, first, as shown in FIG. 11, a predetermined amount of uncured epoxy resin 3 is injected into the end opening 22a of the branch tube network part 22 inserted into the branch pipe 12. Also in this case, the uncured epoxy resin 3 is injected in a state in which the entire area of the end opening 12a of the branch pipe 12 is closed.

  And after inject | pouring the unhardened epoxy resin 3 in the edge part opening 22a of the branch cylinder network part 22, the lining apparatus 4 is installed in the position corresponding to the edge part opening 12a of the branch pipe 12, as shown in FIG. Note that the lining device 4 used for the branch pipe may have a short lining tube 42 because the lining length is short.

  Next, when compressed air A is supplied from the air pipe 46 of the lining device (for branch pipe) 4, the front end portion 44 of the lining tube 42 moves forward while being reversed (shown by a chain line in FIG. 11). When the leading end 44 of the lining tube 42 enters the branch pipe 12, as shown in FIG. 12, the uncured epoxy resin 3 is pushed forward, pushed outward, and pushed outward. The uncured epoxy resin 3a is sequentially filled into the mesh of the branch tube net 22. The filling (coating) of the uncured epoxy resin 3 into the mesh is performed on the entire peripheral surface in the branch pipe 12. When the leading end 44 of the lining tube 42 enters the connecting portion in the branch pipe 12 (position where the lining tube leading end 44 slightly protrudes into the main pipe 11) as shown in FIG. Is stopped (the valve 47 is closed), and the inside of the lining tube 42 is maintained as it is. In this state (FIG. 12), the uncured lining layer B containing the branch tube network portion 22 is formed on the entire length and the entire circumference in the branch pipe 12. Of the uncured epoxy resin injected into the branch pipe 12, the excess epoxy resin that was not applied to the inner surface of the branch pipe 12 was pushed into the main pipe 11 (main tube net 12) without being cured. Then, the uncured epoxy resin 3 (FIG. 12) injected into the main pipe 11 side at the time of coating in the main pipe 11 is joined and used as a lining material in the main pipe 11.

  Next, with the pressure inside the lining tube 42 on the branch pipe 12 side maintained, the uncured epoxy resin 3 is put into the one end opening 11a of the main pipe 11 (one end opening 21a of the main tube net portion 21) as shown in FIG. A predetermined amount is injected, and the main pipe lining device 4 is installed at a predetermined position.

  Then, the main pipe 11 side lining operation is performed. As shown in FIG. 13, compressed air A is supplied from the air pipe 46 of the main pipe lining device 4, and the tip portion 44 of the lining tube 42 is reversed and advanced. As a result, the uncured epoxy resin 3 is pressed against the inner peripheral surface of the main pipe 11 (the uncured epoxy resin 3a is filled in the mesh of the main cylinder net portion 21), and the tube network 21 is sequentially entered into the branch pipe 12. The uncured lining layer B is formed.

  And as shown in FIG. 14, when the lining tube front-end | tip part 44 protrudes slightly from the other end opening 11b (end part 21b of the main cylinder net part 21) of the main pipe 11, supply of compressed air A is stopped, and lining is carried out. The inside of the tube 42 is maintained as it is. In this state (FIG. 14), the lining layers B and B with a tubular net are formed in the main pipe 11 and the branch pipe 12, respectively, and also in the branch pipe 12 and the main pipe 11 at the connecting portion of the branch pipe 12. A lining layer with a tubular net is formed over the two.

  In the state of FIG. 14, the inside of each of the lining tubes 42 and 42 inserted into the branch pipe 12 and the main pipe 11 is maintained as it is, and the uncured epoxy resin 3a on the inner surface of the pipe 10 is cured (uncured epoxy in the pipe). The resin 3a is cured within one day). And after the coating epoxy resin in the piping 10 hardens | cures, when each lining tube 42 and 42 is reverse-reversed respectively and each lining tube 42 and 42 is extracted from the main pipe 11 and the branch pipe 12 as shown in FIG. A hardened lining layer B with a tubular net is formed over the entire inner circumferential surface of the pipe (the main pipe 11 and the branch pipe 12).

  By the way, when each lining tube 42, 42 is extracted from the pipe, a burr Ba made of a cured epoxy resin remains on the inner surface of the connecting portion of the branch pipe 12 as shown in FIG. 15, but this burr Ba is formed on the branch pipe 12 (short). A tool is inserted and cut out from the end opening 12a.

  Also in the case of the second embodiment, the fixed portions (the portions 2c in FIG. 15) of the end portions of the tubular nets are exposed at the opening edge portions (three places) of the end portions of the pipe 10, respectively. When the exposed portions 2c, 2c, and 2c are cut off, the lining-processed piping 10 shown in FIG. 16 is obtained.

  In the case of the second embodiment as well, the above lining process can be repeated twice when a lining process with a high pressure resistance is required. In another embodiment, an epoxy resin may be further coated on the inner surface of the tubular netting cured lining layer B formed in the pipe by a method such as pigling.

  In the lining method according to the second embodiment, even in the pipe 10 with the branch pipe 12, the hardened lining layers B and B that are continuous with the inner surface of the main pipe 11 and the inner face of the branch pipe 12 can be formed.

It is an initial stage figure of the lining construction method of the 1st example of this application. It is a work process progress figure from FIG. It is a work process progress figure from FIG. FIG. 4 is a work process progress diagram from FIG. 3. FIG. 5 is a work process progress diagram from FIG. 4. It is VI-VI expanded sectional drawing of FIG. It is a work process progress view from FIG. FIG. 8 is a work process progress diagram from FIG. 7. It is an initial stage figure of the lining construction method of 2nd Example of this application. FIG. 10 is a work process progress diagram from FIG. 9. It is a work process progress view from FIG. FIG. 12 is a work process progress diagram from FIG. 11. FIG. 13 is a work process progress diagram from FIG. 12. It is a work process progress view from FIG. It is a work process progress figure from FIG. FIG. 16 is a work process progress diagram from FIG. 15.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 is piping, 1a is one end opening of piping, 1b is other end opening of piping, 2 is cylindrical network, 2a is one end opening of cylindrical network, 3 is uncured lining material, 4 is lining device, 10 is piping with branch pipe , 11 is a main pipe, 11a is one end opening of the main pipe, 12 is a branch pipe, 12a is an end opening of the branch pipe, 20 is a cylinder network with a branch cylinder network part, 21 is a main cylinder network part, and 21a is a main cylinder network part. One end opening, 22 is a branching cylinder network part, 22a is an end opening of the branching cylinder network part, 42 is a lining tube, and B is a lining layer with a cylinder network.

Claims (2)

A method of lining the inner surface of an existing pipe (1) made of a single pipe,
Using a cylindrical mesh (2) knitted into a cylindrical shape with fibers and having the same outer diameter as the pipe (1) and the same length as the pipe (1),
Insert the tubular net (2) from the one end opening (1a) of the pipe (1) in a state corresponding to the entire length range of the pipe (1),
An uncured lining material (3) is injected into one end opening (2a) of the tubular net (2) inserted into the pipe (1),
From the one end opening (2a) of the cylindrical net (2) into which the uncured lining material (3) is injected, the lining tube (42) which expands due to fluid pressure and advances while the tip portion (44) side is sequentially reversed. Insert and fill the mesh in the entire circumferential direction of the tubular mesh (2) while pressing the uncured lining material (3) forward,
With the lining tube (42) inserted into the entire length of the pipe (1), the inside of the lining tube (42) is held until the uncured lining material (3) is cured,
After the lining material (3) is cured, the lining tube (42) is reversely inverted and extracted from the pipe (1), thereby forming a cured lining layer (B) containing a tubular net on the inner peripheral surface of the pipe (1). ,
A lining method for the inner surface of existing piping. A method of lining the inner surface of an existing pipe (10) having a main pipe (11) and a branch pipe (12) across the main pipe (11) and the branch pipe (12),
The main cylinder net part (21) and the inner diameter of the branch pipe (12), which are knitted into a cylindrical shape having a mesh with fibers and have the same outer diameter as the main pipe (11) and the same length as the main pipe (11) Using a cylinder network (20) having a branch cylinder network part (22) having substantially the same outer diameter and the same length as the branch pipe (12),
From the one end opening (11a) of the pipe to the tube network (20), the main tube network portion (21) corresponds to the entire length range in the main tube (11) and the branch tube network portion (22) is in the branch tube (12). Insert in a state corresponding to the full length range of
An uncured lining material (3, 3) is injected into the one end opening (21a) of the main tube net (21) and the end opening (22a) of the branch tube net (22), respectively.
From the one end opening (21a) of the main cylinder net part (21) and the end opening (22a) of the branch cylinder net part (22) into which each uncured lining material (3, 3) is injected, the swell diameter is increased by fluid pressure. At the same time, the lining tube (42) that advances while the tip end (44) side is sequentially reversed is inserted, and the uncured lining material (3) is pushed forward while the main tube net (21) and the branched tube net (22) fill the mesh in the entire circumferential direction of each,
The inside of each lining tube (42, 42) is maintained until the uncured lining material (3) is cured with each lining tube (42, 42) inserted into the entire length of each of the main pipe (11) and the branch pipe (12). Press,
After each lining material (3) in the main pipe (11) and the branch pipe (12) is cured, each lining tube (42, 42) is reversed and pulled out from the main pipe (11) and the branch pipe (12). Thus, a cylindrical lining containing lining layer (B) is formed on each inner peripheral surface of the main pipe (11) and the branch pipe (12).
A lining method for the inner surface of existing piping.

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