JP6009754B2 - Rehabilitation pipe and method for forming the same - Google Patents

Description

  The present invention relates to a rehabilitation pipe that is mounted on an inner peripheral surface of an existing pipe such as a sewer pipe and a method for forming the rehabilitation pipe.

  Since sewer pipes deteriorate with long-term use, repair management against aging has become an important task. The service life of sewage pipes is generally about 50 years, and sewer pipes that have exceeded the service life are increasing year by 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, it is necessary to repair, renovate, or replace with aging, and because of these various circumstances, existing pipes need to be repaired at certain times. is there.

  As a method for repairing existing pipes, for example, a repair method using a lining material made of a thermoplastic resin is known (Patent Document 1). In this repair method, a pipe end plug that allows a polyvinyl chloride lining material folded into an omega shape or the like to be drawn into an existing pipe and then the pressure inside the pipe lining material to be adjusted at both ends. After heating, a heating fluid such as steam is sent to the inside and restored from a folded state to a tubular shape. After that, pressure is applied from the inside to cool and harden the lining material in close contact with the inner surface of the existing pipe. A rehabilitation tube is formed.

  In Patent Document 2, a lining material formed by weaving a thermoplastic resin fiber and a reinforcing fiber into a tubular shape is introduced by being drawn into an existing pipe, and then heat and pressure are applied from the inside to the thermoplastic resin. A repair method is described in which a renovated pipe is formed on the inner peripheral surface of an existing pipe by melting and cooling the fiber while being in close contact with the inner peripheral face of the existing pipe.

Japanese Patent Laid-Open No. 2001-232684 JP-T-2001-507639

  The rehabilitation pipe formed by the method described in Patent Document 1 is a rehabilitation pipe made of only a thermoplastic resin such as polyvinyl chloride or polyethylene having a relatively low mechanical strength. Thickness is required. When trying to increase the thickness of the rehabilitation pipe, the material itself becomes heavier and difficult to construct, and the inner diameter of the rehabilitation pipe itself becomes smaller, and sufficient flow-down function cannot be secured. .

  Further, the lining material used in the method of Patent Document 2 is a woven lining material having a low apparent density in which voids are present between the fibers, although the strength is increased by reinforcing fibers and the strength of the finished material is improved. Since the thermoplastic resin fibers are melted by heating and the voids are not filled, the rehabilitated tube after heating and cooling becomes extremely thin compared to the state before heating and cooling.

  Therefore, in order to obtain a thickness that can secure sufficient strength as a pipe line, the thickness before heating and cooling must be several times that thickness. In this case, the entire lining material is made of thermoplastic resin fibers. When performing high-temperature heating at a temperature equal to or higher than the melting point, heat may not be sufficiently distributed to the entire lining material, and the thermoplastic resin fibers may remain undissolved. If unmelted residue occurs, bubbles and gaps remain, or the adhesion to the inner peripheral surface of the existing pipe decreases, causing water leakage and strength reduction, making it difficult to ensure a good quality renovated pipe.

This invention is made | formed in view of the said situation, The objective is to provide the formation method of the rehabilitation pipe | tube which has sufficient intensity | strength , suppressing the increase in pipe | tube thickness.

In order to achieve the above object, the method for forming a rehabilitation pipe according to claim 1 includes an outer resin layer made of a thermoplastic resin, a thermoplastic resin and a reinforcing fiber provided inside the outer resin layer. A step of introducing a tubular lining material having a reinforced composite layer composed of a fiber assembly into an existing pipe, and heating the tubular lining material to at least the thermoplastic resin of the reinforced composite layer, and the outer resin layer. A heating step for melting the surface portion of the reinforced composite layer, a pressure-contacting step for pressing the tubular lining material in close contact with an inner peripheral surface of the existing pipe, and a cooling for cooling the tubular lining material after the pressure-welding step And the outer resin layer prevents groundwater that has entered the existing pipe from coming into contact with the reinforced composite layer, and the rehabilitation pipe includes the outer resin layer and an inner side of the outer resin layer. An inner reinforcing layer made of a thermoplastic resin containing reinforcing fibers and formed thinner than the outer resin layer, wherein the inner reinforcing layer heats, presses and cools the reinforcing composite layer. In the rehabilitated pipe, the outer resin layer and the inner reinforcing layer are integrated with each other .

According to this configuration, due to the presence of the inner reinforcing layer including the reinforcing fibers inside the outer resin layer, the thickness of the rehabilitated pipe itself is made thinner than when the thickness is increased by increasing the thickness of the thermoplastic resin alone. can do. In addition, the inner reinforcing layer in the state after heating and cooling the tubular lining material, that is, the inner reinforcing layer of the completed rehabilitation pipe has an auxiliary role to supplement the strength of the outer resin layer, and should be made thicker than necessary. Since it is not necessary, it can be configured as a thickness that can be heated sufficiently and quickly, and it is possible to obtain a high-quality rehabilitation pipe that is prevented from being left undissolved. With such an outer resin layer and a reinforcing layer, a sufficient thickness as a pipe line is ensured, and a rehabilitated pipe having a pipe thickness that can sufficiently secure the flow-down function can be obtained. Furthermore, a rehabilitation pipe having an inner reinforcing layer and an outer layer can be formed by a series of operations (introduction, heating, pressure welding and cooling). That is, by heating the tubular lining material and pressing the inner surface of the existing pipe while removing the voids (bubbles) between the fibers of the fiber assembly, and cooling and hardening in that state, A rehabilitated tube integrated with the outer layer can be obtained by a simple construction method.
Method of forming a rehabilitating pipe according to claim 2, in the method of forming the rehabilitating pipe according to claim 1, the thermoplastic resin of the outer resin layer, thermoplastic resin of the inner reinforcing layer is the same resin It is characterized by that.

Method of forming a rehabilitating pipe according to claim 3, in the formation method of rehabilitating pipe according to claim 1 or 2, the thickness of the inner reinforcing layer, characterized in that it is a 2 to 5 mm.

  According to this configuration, the thermoplastic resin contained in the inner reinforcing layer can be made into a molten state by heating in a short time when the rehabilitation pipe is formed, so that the remaining of bubbles can be reliably suppressed, and a uniform and dense reinforcing layer can be formed. Can be obtained. In addition, by setting the thickness within this range, the thermoplastic resin on the inner surface portion of the outer layer can also be heated and melted during heating, and a rehabilitated tube in which the outer layer and the inner reinforcing layer are completely closely integrated is obtained. Can do.

Method of forming a rehabilitating pipe according to claim 4, characterized in that in the method of forming a rehabilitating pipe according to any one of claims 1 to 3, the thickness of the outer resin layer is 5~15mm And By setting the outer resin layer, which is the main part of the rehabilitation pipe, to a thickness in this range, the strength of the pipe line can be sufficiently maintained, and the increase in the thickness of the rehabilitation pipe can be suppressed. It becomes possible to avoid the deterioration of the function accurately.

The method for forming a rehabilitation pipe according to claim 5 is the method according to any one of claims 1 to 4 , wherein the fiber assembly of the reinforced composite layer is a collection of reinforcing fibers coated with a thermoplastic resin. It is characterized by being configured as a body. According to this configuration, the thermoplastic resin melted by heating is evenly distributed between the reinforcing fibers, and voids (bubbles) between the fibers of the fiber assembly are removed by the pressure welding process, and the reinforcement is filled without gaps. A layer can be formed.

According to the method for forming a rehabilitated tube according to the present invention, an increase in the tube thickness is suppressed by the well-formed inner reinforcing layer and the outer layer of the thermoplastic resin that are sufficiently heated during the formation. Sufficient strength as a pipe line can be obtained, and the flow-down function can be sufficiently secured.

It is a cross-sectional view showing an example of a tubular lining material. It is a detailed sectional view showing (a) before heating and (b) after heating and cooling of the reinforced composite layer. It is detail drawing which shows an example of a reinforced composite layer. It is a cross-sectional view which shows an example of the rehabilitation pipe | tube of this invention. It is a cross-sectional view which shows the state by which the tubular lining material was folded. It is explanatory drawing which shows the process of introduce | transducing a tubular lining material into an existing pipe. It is a cross-sectional view which shows the state introduced into the existing pipe. It is explanatory drawing which shows the process of introduce | transducing a heating apparatus into a tubular lining material. It is detail drawing of the existing pipe edge part at the time of rehabilitation pipe formation. It is explanatory drawing which shows the heating and press-contact process of a tubular lining material. It is detailed explanatory drawing which shows a heating apparatus and its heating method. It is explanatory drawing which shows the rehabilitation pipe | tube formed in the existing pipe | tube. It is a cross-sectional view which shows the rehabilitation pipe | tube formed in the existing pipe | tube. It is explanatory drawing which shows another example of a heating press-contacting process. It is explanatory drawing which shows the process of supplying compressed gas in another example of a heating-pressing process.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In each drawing, the main part is highlighted to facilitate understanding of the description, and the dimensional ratio of each component on the drawing does not necessarily match the actual dimensional ratio.

  FIG. 1 is a schematic cross-sectional view showing an example of a tubular lining material suitable for obtaining the rehabilitated tube of the present invention, that is, a tubular lining material before final curing. This tubular lining material 10 has a tubular outer resin layer 14 made of a thermoplastic resin, and a tubular reinforced composite layer 12 containing a reinforced fiber and a thermoplastic resin. The reinforced composite layer 12 is an inner, outer resin layer 14. Is configured to be outside.

  The reinforced composite layer 12 is composed of a fiber assembly including a thermoplastic resin and a reinforced fiber, and specifically, a woven fabric or a knitted fabric formed from a fiber bundle (diameter of about 5 mm) of a thermoplastic resin fiber and a reinforced fiber, A woven fabric or knitted fabric formed from a fiber bundle of reinforcing fibers coated with a thermoplastic resin can be used.

  FIG. 2A shows a detailed cross-sectional view of a fiber bundle of thermoplastic resin fibers and reinforcing fibers. When the reinforced composite layer 12 composed of the reinforced fibers 30 and the thermoplastic resin fibers 32 is heated to a temperature equal to or higher than the melting point of the thermoplastic resin 32 before heating and cooling, the thermoplastic resin fibers 32 are melted and voids between the reinforced fibers 30. As shown in FIG. 2B, the reinforcing fibers 30 are mixed in the thermoplastic resin (black portion), and the inner reinforcing layer 22 which is a reinforced plastic layer is obtained.

  FIG. 3 is a detailed surface view showing an example of the reinforced composite layer 12. This figure shows an example in which a reinforced composite layer is formed from a woven fabric in which a plurality of fiber bundles formed by bundling a large number of fibers are woven together.

  The reinforced composite layer 12 is preferably a woven or knitted fabric formed from fiber bundles of reinforcing fibers coated with a thermoplastic resin. By adopting such a configuration, the thermoplastic resin melted by heating is uniformly distributed in the gaps between the reinforcing fibers, and the gaps and bubbles between the fibers are removed by the press-contacting process to the inner peripheral surface of the existing pipe described later. A layer completely filled with no gap is formed, and a strong reinforcing layer is obtained.

  The outer resin layer 14 shown in FIG. 1 is a tubular material made of a thermoplastic resin, and is a layer that is the main body of a rehabilitated pipe that is a finished product. The outer resin layer 14 not only constitutes a part of the rehabilitated pipe, but also prevents the groundwater that has entered from cracks in the existing pipe to be repaired from coming into contact with the reinforced composite layer 12, and the formation process (heating, melting and integration) It also has a role of preventing hindrances to The outer resin layer 14 may contain additives such as a plasticizer as necessary.

  Before heating (state of FIG. 1), the thickness of the reinforced composite layer 12 is, for example, 6 to 15 mm, and the thickness of the outer resin layer 14 is, for example, 5 to 15 mm. And the reinforcement composite layer 12 becomes thin by the space | interval between each fiber being filled after heating and cooling as mentioned above, and the renovated pipe | tube 20 obtained is an inner reinforcement layer, as shown in FIG. The thickness of 22 is thinner than the thickness of the outer layer 24. After heating and cooling, the thickness of the inner reinforcing layer 22 is preferably 2 to 5 mm, and the thickness of the outer layer 24 is preferably 5 to 15 mm. The obtained rehabilitation pipe 20 is in a state in which the interfaces between the inner reinforcing layer 22 and the outer layer 24 are in close contact with each other and are not separated, and the layers are integrated. The heating temperature is, for example, about 230 ° C. when polypropylene is used as the thermoplastic resin of the reinforced composite layer 12.

  Further, the thickness of the reinforced composite layer 12 and the outer resin layer 14 of the tubular lining material 10 is set so that the ratio of the thickness of the rehabilitated tube 20 (inner reinforcing layer 22: outer layer 24) is 1: 1.5-7. Is preferably adjusted. If it exists in this range, intensity | strength will improve further and it will become a rehabilitation pipe | tube with high durability.

  The reinforced composite layer 12 and the outer resin layer 14 of the tubular lining material 10 shown in FIG. 1 may be bonded with an adhesive or the like to be in a temporary contact state, or may be separated without being bonded. By setting the temporary contact state, the temporary diameter expansion work performed in the rehabilitation pipe forming process described later is smoothly performed. That is, the outer resin layer 14 made of a thermoplastic resin is gradually expanded from a folded state for storage or carry-in so as to have a circular cross section by heating with steam or the like. The reinforced composite layer 12, which is a body, does not have a circular cross-section from a folded state only by heating. Therefore, by setting the reinforced composite layer 12 and the outer resin layer 14 in a temporary contact state, the reinforced composite layer 12 can be temporarily expanded at the same time as the outer resin layer 14 is temporarily expanded in diameter.

  Further, the surface (inner surface) of the outer resin layer 14 on the reinforced composite layer 12 side is preferably embossed. By embossing, the surface area in contact with the outer resin layer 14 is increased after the thermoplastic resin of the reinforced composite layer 12 is melted, so that the degree of adhesion is improved and the inner side of the renovated pipe 20 (shown in FIG. 4) formed. The integration of the reinforcing layer 22 and the outer layer 24 is further strengthened.

  Examples of the thermoplastic resin used for the reinforced composite layer 12 and the outer resin layer 14 include polyolefins such as polyethylene, polypropylene, polyvinyl chloride, and polystyrene, and polyesters such as polyethylene terephthalate and polybutylene terephthalate. These thermoplastic resins may be used individually by 1 type, and may be used in combination of 2 or more type. Among these, polyethylene and polypropylene are preferred because they have a relatively low melting point and are easily melted by heating and do not contain chlorine that can cause environmental pollutants, and polypropylene is particularly preferred because of its high strength in the cured state.

  The thermoplastic resin used for the reinforced composite layer 12 and the outer resin layer 14 is preferably the same resin. Thereby, since the reinforced composite layer 12 and the outer resin layer 14 are integrated without being separated after heating and cooling, the strength of the rehabilitation pipe is further improved.

  As the reinforcing fiber contained in the reinforced composite layer 12, glass fiber, carbon fiber, aramid fiber, or the like can be used. These reinforcing fibers may be used alone or in combination of two or more. Among these, glass fiber is preferable because it is particularly inexpensive and excellent in productivity.

  The proportion of the reinforcing fibers contained in the reinforced composite layer 12 is preferably 45 to 75% by mass with respect to the mass of the reinforced composite layer 12, and the proportion of the thermoplastic resin is based on the mass of the reinforced composite layer 12. It is preferable that it is 25-55 mass%. If it is this range, a thermosetting resin can be efficiently fuse | melted at the time of a heating, and the high intensity | strength reinforcement layer which uses a reinforced fiber as a core material can be formed.

  The outer diameter of the tubular lining material 10 composed of the reinforced composite layer 12 and the outer resin layer 14 is configured to be substantially the same as the inner diameter of an existing pipe that is to be repaired when the diameter is expanded, which will be described later. Before being introduced into the existing pipe to be repaired and heated and pressed, it is stored and transported in a state of being folded into a U-shaped cross section as shown in FIG.

  In addition, although the tubular lining material 10 of this Embodiment has shown the lining material which consists only of the reinforced composite layer 12 and the outer side resin layer 14, it may have another layer secondary. Examples of the other layer include a heat insulating material layer that prevents heat radiation to an existing pipe to be repaired during heating.

  Next, a method for forming the rehabilitation pipe of the present invention on the inner peripheral surface of the existing pipe will be described. FIG. 6 shows an example of the process of introducing the tubular lining material 10 in the repair work of the existing pipe.

  As a pre-preparation, high-pressure water on the inner peripheral surface of the existing pipe 100 is sprayed and cleaned with a pipe cleaning car or the like to remove foreign matters such as dirt on the inner peripheral surface, deteriorated concrete, and mixed tree roots.

  Next, a blocking member 102 is installed on the upstream side of the manhole 200 and on the downstream side of the manhole 300 in order to block the flow of sewage inside the existing pipe 100. The tubular lining material 10 is not yet in a diameter-expanded state, but is drawn into the existing pipe 100 in a slightly flat shape such as a U-shaped cross section. This pull-in operation is performed by pulling the tubular lining material 10 stored in a roll shape around the storage unit 101 on the manhole 200 side by a pulling means (not shown) installed on the ground portion on the manhole 300 side. It is drawn into the existing pipe 100 by operation.

  When the tubular lining material 10 is drawn, the drawing work is performed after preheating to a temperature (generally about 70 ° C.) above the softening point of the thermoplastic resin of the outer resin layer 14 and less than the melting point by steam or the like. Do. The pulling means is equipped with a pulling rope or the like, and is fixed to the tip of the tubular lining material 10. The tubular lining material 10 is pulled into the existing pipe 100 from the manhole 200 side to the manhole 300 side by being pulled by the pulling rope. Subsequently, the tubular lining material 10 is cut to a length over the entire area of the existing pipe 100 to be repaired, and the introduction process is completed.

  FIG. 7 is a cross-sectional view showing an example of the state of the tubular lining material 10 introduced into the existing pipe 100. The cross-sectional shape when introduced as shown in the figure is not circular but the internal space is narrowed.

  FIG. 8 is an explanatory view showing a state in which a heating device for heating the tubular lining material 10 is introduced and arranged. After making the tubular lining material 10 introduced into the existing pipe 100 into a temporarily expanded state by feeding steam or the like, the heating device 106 is connected to the inside of the tubular lining material 10 from the end of the tubular lining material 10 on the manhole 300 side. To introduce. In the figure, a work machine 108 disposed on the ground near the manhole 200 is for supplying gas such as electricity and air to the heating device 106 and pulling the heating device 106 to move it to the manhole 200 side. There is a connecting member 110 composed of a cable, a wire, a hose or the like passed through the inside of the tubular lining material 10, and is connected to the tip of the heating device 106 via the direction change roll 104.

  In addition, at the end of the existing pipe 100 on the side of the manhole 300, as shown in FIG. 9 which is a detailed view thereof, the extension pipe 116 is temporarily installed so as to face the end of the existing pipe 100. The outer layer 22 wraps around the outer periphery, and is temporarily fixed with the ring-shaped band 118 to be in an open state, thereby facilitating the work. Similarly, the end portion of the tubular lining material 10 on the side of the manhole 200 may be opened.

  FIG. 10 is a schematic diagram for explaining an example of the heating and pressure welding process. After the heating device 106 is introduced, a reversing bag 112 that is inflated while being reversed by feeding gas into the inside is introduced from the manhole 300 side ground. The end portion of the inversion bag 112 in the expansion direction (arrow direction) is in contact with the rear side of the heating device 106 in the traveling direction. Such a reversing bag 112 is usually wound and stored in the storage device 114, and is supplied with a fluid and unwound, and is introduced into the existing pipe 100 through the manhole 300.

  The heating device 106 heats the tubular lining material 10 while moving in the direction of the manhole 200 by being pulled by the connecting material 110. As this heating device, a device for heating with hot air or a heater can be used.

  As shown in FIG. 11, which is a detailed view of the heating device 106 illustrated in the drawing, a heater 106a is built in a portion where the outer shape of the front portion in the traveling direction is constricted. A gas such as air supplied from the working machine 108 via a hose (not shown) of the connecting member 110 is heated. The heated gas is sent to the outside of the heating device 106 from the heater 106 a through the communication pipe 107 communicating with the outside of the heating device 106. The delivered heated gas flows in the direction of the manhole 200 while heating the tubular lining material 10.

  The rear part in the traveling direction of the heating device 106 is made of metal, rubber, or the like, and the shape thereof is cylindrical, and the heated tubular lining material 10 has a circular cross section while letting bubbles contained therein escape to the outside. Expand the diameter.

  The heating is performed so that the temperature becomes higher than the melting point of the thermoplastic resin contained in the reinforced composite layer 12 of the tubular lining material 10 (usually 170 to 240 ° C.), and at least the thermoplastic resin of the reinforced composite layer 12 is melted. Thereby, the molten thermoplastic resin of the reinforced composite layer 12 flows into the space between the reinforced fibers, and the reinforced fibers are mixed in the thermoplastic resin. The outer resin layer 14 does not need to be heated to the extent that the resin melts, and may be at a temperature that is soft enough (usually 60 to 100 ° C.). It is preferable that the surface portion is also melted at the same time, whereby a strong adhesion state can be obtained at the interface where each layer is in contact.

  Then, the heated tubular lining material 10 is pressed against the inner peripheral surface of the existing pipe 100 by the reversing bag 112, and is cured by cooling in this pressed state. By cooling while being pressed, shrinkage at the time of cooling and hardening can be suppressed and the inner periphery of the existing pipe 100 can be completely adhered. The cooling may be natural cooling, or may be urged so as to accelerate curing by blowing a cooling medium such as cold air.

  After the heating, pressure welding and cooling processes are completed over the entire range of the introduced tubular lining material 10, the heating device 106 is taken out and removed, and the reversing bag 112 is drawn from the introduction side and removed. Then, by performing the pipe opening process at both ends, the renovated pipe 20 is formed on the inner peripheral surface of the existing pipe 100 as shown in FIG. 12, and the repair is completed. FIG. 13 is a cross-sectional view showing the rehabilitation pipe 20 of the present invention formed on the inner peripheral surface of the existing pipe. As shown in the figure, the rehabilitated tube 20 in which the thickness of the inner reinforcing layer 22 is thinner than the thickness of the outer layer 24 is covered on the inner peripheral surface of the existing tube 100.

  Thus, the completed rehabilitation pipe | tube 20 is made into the reinforced plastic layer in which the inner side reinforcement layer 22 was formed by sufficient and quick heating in the said heating process, and sufficient intensity | strength as a pipe line is ensured. The tube thickness is sufficient to ensure the flow-down function. The inner reinforcing layer 22 has a thickness of about 20 to 30% of the thickness of the reinforced composite layer 12 (see FIG. 1) that is in a state before heating and cooling.

  Next, another method for heating, pressure-contacting and cooling the tubular lining material 10 will be described. FIG. 14 is a schematic diagram thereof. First, the heating and pressure welding apparatus 120 is introduced into the tubular lining material 10 introduced in the same manner as the method described in FIG. The heating and pressure welding device 120 is composed of a front part 120a that performs heating and a rear part 120b that performs pressure welding. The rear part 120b has a cylindrical shape, and its outer diameter is formed so as to be substantially the same as the inner diameter of the obtained rehabilitation pipe, and the material thereof is metal, rubber or the like. The rear portion 120b may be an expansion body that expands by supplying a fluid such as gas or water.

  A heater is built in the front portion 120a of the heating and pressure welding device 120, and the tubular lining material 10 is heated to melt at least the thermoplastic resin of the reinforced composite layer 12. The forward end portion of the heating and pressure welding device 120 is connected to the working machine 108 disposed on the ground near the manhole 200 by the connecting material 110, and the working machine 108 is connected to the heating and pressure welding device 120 in the same manner as described above. Supply of electricity, gas, etc. and movement of the heating and pressure welding apparatus 120 are performed.

  The heating and pressure welding apparatus 120 moves while heating, and the tubular lining material 10 heated by the front portion 120a is expanded in diameter in a cross-sectional shape by the cylindrical rear portion 120b and is pressed against the inner peripheral surface of the existing pipe 100. .

  The rear part 120b of the heating and pressure welding device 120 also has a cooling function for cooling the heated tubular lining material 10 by supplying a cooling medium such as water from the cooling medium supply unit 128 via the hose 130 and circulating it. Have. By accelerating the cooling by such a cooling function, it is possible to prevent the rehabilitation pipe from being deformed that may be caused by incomplete cooling after pressure welding.

  Further, as shown in FIG. 15, after the heating and pressure welding apparatus 120 is moved by a predetermined distance, the end portion of the tubular lining material 10 on the side of the manhole 300 is sealed with a sealing member 124. Compressed gas may be supplied to the sealed space 126. By supplying the compressed gas, the tubular lining material 10 is sufficiently pressed against the inner peripheral surface of the existing tube 100 and can be completely adhered. In the figure, a compressor 136 that supplies compressed gas via a supply pipe 134 is disposed on the manhole 300 side ground.

  After the heating and pressure welding device 120 is moved to the manhole 200 side end of the existing pipe 100 and the entire tubular lining material is heated, pressed and cooled, the inner peripheral surface of the existing pipe 100 is subjected to pipe opening treatment at both ends. The rehabilitation pipe 20 according to the present invention is completed (see FIGS. 12 and 13). In the example shown in FIGS. 14 and 15, a large-scale device such as the reversing bag described in FIG. 10 is not required, and the construction becomes simpler.

  The construction method for obtaining the rehabilitated pipe of the present invention is not limited to the above example, and the lining material for forming the outer layer and the lining material for forming the inner reinforcing layer are separately introduced and covered to be rehabilitated. A method of forming a tube may also be used.

  In this method, first, after introducing a first tubular lining material composed of a thermoplastic resin for forming an outer layer, an outer layer forming step of heating and cooling and covering an inner peripheral surface of an existing tube, and a reinforcing fiber And a second tubular lining material containing a thermoplastic resin, and then an inner reinforcing layer forming step of heating and cooling to cover the inner peripheral surface of the outer layer.

  In the outer layer forming step, first, if necessary, the first tubular lining material composed of a thermoplastic resin stored in a state of being folded into an omega shape or the like is preheated and softened before being introduced into the existing pipe. The first tubular lining material corresponds to the outer resin layer 14 shown in FIG. 1, and the resins mentioned above as examples can be used. Next, in order to expand the diameter of the introduced first lining material by blowing a pressurized gas into the inside thereof, valves are attached to both ends of the first lining material, and the pressurized gas is blown.

  As the pressurized gas blowing means, for example, a pressurized gas that is installed on the ground near the manhole and includes a part that generates steam and a pump that sends the generated steam to the blowing port through a hose in a pressurized state. A feeding device is used. Then, the outer side layer comprised from a thermoplastic resin is formed in the internal peripheral surface of an existing pipe | tube by cooling a 1st lining material.

  In the inner reinforcing layer forming step, the second tubular lining material including the thermoplastic resin and the reinforcing fibers is drawn into the outer layer formed in the outer layer forming step and introduced. The second tubular lining material corresponds to the reinforced composite layer 12 shown in FIG. 1, and the woven fabrics exemplified in the above can be used.

  Then, after introducing the second tubular lining material into the existing pipe, heating, pressure welding and cooling are performed. Heating, pressure welding, and cooling may be performed by the methods shown in FIGS. 10, 14, and 15 described above. Thereby, the rehabilitation pipe | tube which has the inner side reinforcement layer comprised from the thermoplastic resin containing a reinforcement fiber inside the outer layer comprised from a thermoplastic resin is covered by the existing pipe inner peripheral surface, and an existing pipe is repaired. In addition, the thickness of the first tubular lining material and the second tubular lining material is appropriately adjusted so that the thickness of the inner reinforcing layer of the completed correction pipe is thinner than the thickness of the outer layer.

  In addition, as another rehabilitation pipe forming method in which the lining material for forming the outer layer and the lining material for forming the inner reinforcing layer are separately introduced, the first lining material made of the thermoplastic resin is introduced. Then, after at least temporarily expanding the diameter (that is, it is not necessary to completely adhere to the inner peripheral surface of the existing pipe as described above), the second lining material is introduced inside the first lining material in the temporarily expanded diameter state. Then, the rehabilitated tube of the present invention can be obtained by performing the heating, pressure welding and cooling steps in the same manner as the method described above (the method of FIGS. 10, 14 and 15).

  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. In the above embodiment, an example in which the tubular lining material of the present invention is applied to a sewer main pipe is shown, but the tubular lining material of the present invention can also be applied to a mounting pipe that connects a trough and a sewer main pipe. .

DESCRIPTION OF SYMBOLS 10 Tubular lining material 12 Reinforcement composite layer 14 Outer resin layer 20 Rehabilitation pipe 22 Inner reinforcement layer 24 Outer layer 30 Reinforcing fiber 32 Thermoplastic resin 100 Existing pipe 102 Damping member 104 Direction change roll 106 Heating device 107 Communication pipe 108 Working machine 110 Connecting material 112 Reversing bag 114 Storage unit 116 Extension pipe 118 Band 120 Heating and pressure welding device 124 Sealing member 126 Sealing space 128 Cooling medium supply unit 130 Hose 134 Supply tube 136 Compressor 200, 300 Manhole

Claims (5)

A method of forming a rehabilitating pipe that will be covered state to an inner circumferential surface of the existing pipe,
A tubular lining material having an outer resin layer composed of a thermoplastic resin and a reinforced composite layer composed of a fiber assembly including a thermoplastic resin and a reinforcing fiber provided inside the outer resin layer is provided in an existing pipe. The process of introducing into
A heating step of heating the tubular lining material to melt at least the thermoplastic resin of the reinforced composite layer and the reinforced composite layer side surface portion of the outer resin layer;
A press-contacting step of press-contacting the tubular lining material so as to be in close contact with an inner peripheral surface of the existing pipe;
A cooling step of cooling the tubular lining material after the press-contacting step;
Including
The outer resin layer prevents the groundwater that has entered the existing pipe from coming into contact with the reinforced composite layer ,
The rehabilitating pipe has the outer resin layer, and an inner reinforcing layer provided on the inner side of the outer resin layer, made of a thermoplastic resin containing reinforcing fibers and formed thinner than the outer resin layer,
The inner reinforcing layer is obtained after the heating, pressing and cooling the reinforcing composite layer,
In the rehabilitated pipe, the outer resin layer and the inner reinforcing layer are integrated with each other . The method for forming a rehabilitated pipe according to claim 1, wherein the thermoplastic resin of the outer resin layer and the thermoplastic resin of the inner reinforcing layer are the same resin. The method for forming a rehabilitated tube according to claim 1 or 2, wherein the inner reinforcing layer has a thickness of 2 to 5 mm. The thickness of the said outer side resin layer is 5-15 mm, The formation method of the rehabilitation pipe | tube of any one of Claims 1-3 characterized by the above-mentioned. The method for forming a rehabilitated pipe according to any one of claims 1 to 4, wherein the fiber assembly of the reinforcing composite layer is configured as an assembly of reinforcing fibers coated with a thermoplastic resin.

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