Pipe end member, pipe structure, and pipe structure construction method

Abstract

To provide a pipe end member, a pipe structure and a pipe structure construction method which prevent an end part of an inner circumferential surface of an outer side pipe from being exposed concerning a pipe end member set-up from the end part on the inner circumferential surface of the outer side pipe over an end part on an inner circumferential surface of an inner side pipe which is arranged on the inner circumferential surface side of the outer side pipe and is located on the deeper side than a pipe end of the outer side pipe.SOLUTION: A pipe end member comprises: a covering member 11 with which the whole circumference is covered from an end part on an inner circumferential surface EPLi of an outer side pipe EPL to an end part on an inner circumferential surface LPi of an inner side pipe LP; a first pressing member 12 which presses the covering member 11 toward the inner circumferential surface EPLi of the outer side pipe EPL; and a second pressing member 12 which presses the covering member 11 toward the inner circumferential surface LPi of the inner side pipe LP are provided. Therein, the covering member 11 is provided with an engaging part 111 which engages with a thickness face EPL2 between the inner circumferential face EPLi and an outer circumferential face EPLo at a pipe end EPL1 of the outer side pipe EPL.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a pipe end member installed from an end portion on the inner peripheral surface of an outer pipe to an end portion on the inner peripheral surface of an inner pipe disposed on the inner peripheral surface side of the outer pipe and having a pipe end located deeper than the pipe end of the outer pipe, a pipe structure having the pipe end member, and a method for constructing the pipe structure.

Background Art

[0002] In existing pipes such as industrial water pipes, agricultural water pipes, water supply pipes, and gas pipes, when they are aged or the pipe walls are damaged, a lining pipe may be provided inside the existing pipe so as to line the inner peripheral surface of the pipe wall (see, for example, Patent Document 1, etc.). In this case, there is a risk that the pressure fluid flowing through the lining pipe may invade into the slightly generated gap between the existing pipe and the lining pipe and corrode the existing pipe. For this reason, conventionally, a pipe end member has been installed to prevent the pressure fluid from invading into the gap.

[0003] FIG. 1 is a cross-sectional view showing a conventional method of installing a pipe end member.

[0004] FIG. 1 shows only the upper part of the cross-section of an outer pipe 91 which is an existing pipe and an inner pipe 92 which is a lining pipe lining the inner peripheral surface of the outer pipe 91. In FIG. 1, the pipe end 911 of the outer pipe 91 is shown on the left side of the figure, the left side is the pipe end side, and the right side is the deeper side. The inner pipe 92 shown in FIG. 1 is disposed on the inner peripheral surface 91i side of the outer pipe 91, and the pipe end 921 of the inner pipe 92 is located deeper than the pipe end 911 of the outer pipe 91.

[0005] In FIG. 1(a), a rubber cylindrical packing member 931 is attached from an end portion on the inner peripheral surface 91i of the outer pipe 91 to an end portion on the inner peripheral surface 92i of the inner pipe 92, but only the upper part of the cross-section of the packing member 931 is shown. The packing member 931 shown in FIG. 1(a) is attached so that the end 9311 on the pipe end side of the cylindrical packing member 931 coincides with the position of the pipe end 911 of the outer pipe 91.

[0006] The packing member 931 is only attached by hand, and the sealing performance between the outer tube 91 and the inner tube 92 is insufficient. Therefore, an expanding band 932 is used to press the packing member 931. The expanding band 932 is made of stainless steel and is in a C shape, and is attached in order from the back side toward the tube end side. In Fig. 1(b), the expanding band 932 is fitted from the inside on the back side of the packing member 931. When fitting the expanding band 932 from the inside, with the C-shaped expanding band 932 expanded by an expanding tool (not shown), a fixing plate (not shown) that closes the gap is inserted into the C-shaped gap. By inserting the fixing plate, the expanding band 932 maintains the expanded state even when the expanding tool is removed and presses the packing member 931 outward. The fixing plate that closes the C-shaped gap is inserted while tapping it with a hammer from the tube end side toward the back side. Along with the impact of tapping with this hammer, the packing member 931 inevitably shifts toward the back side together with the expanding band 932 (see the arrow in Fig. 1(b)). Moreover, when fitting a plurality of expanding bands 932 in order from the back side, the packing member 931 shifts toward the back side every time a new expanding band 932 is fitted.

[0007] Fig. 1(c) is a view showing a state where the expanding bands 932 are fitted at four locations and the installation of the pipe end member 93 is completed. In the state shown in Fig. 1(c), due to the packing member 931 shifting toward the back side, a portion about 15 cm from the pipe end 911 on the inner peripheral surface 91i of the outer tube 91 is exposed.

[0008] Fig. 1(d) shows a state where one end side of the joint member 95 is connected to the outer peripheral surface 91o of the outer tube 91. Another pipe is connected to the other end side of the joint member 95 shown in Fig. 1(d), and pressure fluid flows into the outer tube 91 provided with the inner tube 92 on the inner peripheral surface 91i side.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0010] When the outer pipe 91 is made of iron such as cast iron, rust generated at the exposed end of the inner peripheral surface 91i may mix into the pressure fluid, and problems may occur on the side using the pressure fluid. Further, even if the outer pipe 91 is not made of iron, if it is aging or damaged, a part of the pipe wall of the exposed portion may peel off and mix into the pressure fluid, and this may also cause problems on the side using the pressure fluid.

[0011] In view of the above circumstances, an object of the present invention is to provide a pipe end member in which the end of the inner peripheral surface of the outer pipe is not exposed, a pipe structure having the pipe end member, and a method for constructing the pipe structure.

Means for Solving the Problems

[0012] The pipe end member of the present invention for solving the above object is a pipe end member installed from the end of the inner peripheral surface of the outer pipe to the end of the inner peripheral surface of the inner pipe disposed on the inner peripheral surface side of the outer pipe and having a pipe end located deeper than the pipe end of the outer pipe, a covering member that covers from the entire circumference of the end of the inner peripheral surface of the outer pipe to the entire circumference of the end of the inner peripheral surface of the inner pipe, a first pressing member that presses the covering member toward the inner peripheral surface of the outer pipe, and a second pressing member that presses the covering member toward the inner peripheral surface of the inner pipe, characterized in that the covering member is provided with a locking portion that locks to the thickness surface between the inner peripheral surface and the outer peripheral surface at the pipe end of the outer pipe.

[0013] According to this pipe end member, even if a force is applied to shift the covering member toward the back side, since the locking portion is locked to the thickness surface, the covering member does not shift toward the back side, and the end of the inner peripheral surface of the outer pipe is not exposed.

[0014] In addition, the pipe end member of the present invention can be used not only for a double pipe having a configuration in which the outer pipe is an existing pipe and the inner pipe is limited to a lining pipe, but also for a double pipe having a configuration such as a new outer pipe and a new inner pipe that is not limited to being lined.

[0015] The covering member preferably has extensibility or is elastically deformable.

[0016] The first pressing member and the second pressing member may be integrally formed. Alternatively, a plurality of the first pressing members may be provided in the extending direction of the outer pipe, or a plurality of the second pressing members may be provided in the extending direction of the inner pipe.

[0017] The first pressing member is such that the force pressing the covering member toward the inner peripheral surface of the outer pipe increases while being pushed toward the back side, and the second pressing member may be such that the force pressing the covering member toward the inner peripheral surface of the inner pipe increases while being pushed toward the back side.

[0018] Also, in the above pipe end member, The locking portion may be bent outward at the edge on the inner peripheral surface of the outer pipe and extend by at least the thickness of the thick surface.

[0019] That is, the locking portion may be such that the bent tip coincides with the outer peripheral surface of the outer pipe, or may protrude further outward from the outer peripheral surface. According to this aspect, the locking amount of the locking portion can be sufficiently ensured. If the tip protrudes outward from the outer peripheral surface and this protrusion becomes an obstacle, the locking portion may be removed after the pipe end member is installed.

[0020] The pipe structure of the present invention for solving the above object is An existing pipe that is buried and used as an internal pressure pipe, A lining pipe that lines the inner peripheral surface of the existing pipe and has a pipe end located deeper than the pipe end of the existing pipe, A pipe structure having a pipe end member installed from the end on the inner peripheral surface of the existing pipe to the end on the inner peripheral surface of the lining pipe, wherein the pipe end member includes a covering member that is pressed against the entire circumference of the end on the inner peripheral surface of the existing pipe and also pressed against the entire circumference of the end on the inner peripheral surface of the lining pipe, characterized in that the covering member has a locking portion locked to the thickness surface between the inner peripheral surface and the outer peripheral surface at the pipe end of the existing pipe.

[0021] This pipe structure has the pipe end member of the present invention, and the end of the inner peripheral surface of the existing pipe is not exposed, and there is no risk of foreign matter derived from the existing pipe being mixed into the pressure fluid.

[0022] Note that the pipe end member may be configured to include a first pressing member that presses the covering member toward the inner peripheral surface of the existing pipe and a second pressing member that presses the covering member toward the inner peripheral surface of the lining pipe. Furthermore, the first pressing member may be configured such that the force pressing the covering member toward the inner peripheral surface of the existing pipe increases while being pushed toward the back side, and the second pressing member may be configured such that the force pressing the covering member toward the inner peripheral surface of the lining pipe increases while being pushed toward the back side.

[0023] Also, in the above pipe structure, it has a joint member that connects the end on the outer peripheral surface of the existing pipe and the end of another pipe, and the locking portion may be configured such that it bends outward at the edge on the inner peripheral surface of the existing pipe, and the bent tip is pressed by the inner peripheral surface of the joint member.

[0024] That is, the tip of the locking portion protrudes further outward from the outer peripheral surface of the existing pipe, and a sufficient locking amount of the locking portion is ensured. Also, since the tip is pressed by the inner peripheral surface of the joint member, the sealing performance with the inner peripheral surface of the joint member is enhanced.

[0025] Note that a water stop material may be filled in the gap between the tip of the locking portion and the inner peripheral surface of the joint member.

[0026] The method for constructing a pipe structure of the present invention for solving the above problems is as follows. A lining pipe forming step of providing a lining pipe that lines the inner peripheral surface of an existing pipe that was buried and used as an internal pressure pipe, and whose pipe end is located deeper than the pipe end of the existing pipe. A pipe end member installation step of arranging a covering member provided with a locking portion from the entire circumference of the end portion on the inner peripheral surface of the existing pipe to the entire circumference of the end portion on the inner peripheral surface of the lining pipe, and pressing the covering member toward the inner peripheral surface of the existing pipe and also toward the inner peripheral surface of the lining pipe while locking the locking portion to the thickness surface between the inner peripheral surface and the outer peripheral surface at the pipe end of the existing pipe.

[0027] According to the pipe end member installation step, by pressing the covering member outward while locking the locking portion to the thickness surface, even if a force is applied to shift the covering member deeper, the covering member does not shift deeper, and the end portion of the inner peripheral surface of the existing pipe is not exposed.

[0028] Note that in the lining pipe forming step, after providing the lining pipe so that the pipe end of the lining pipe protrudes from the pipe end of the existing pipe, the portion of the lining pipe that protrudes from the pipe end of the existing pipe is cut, and further, the end portion of the lining pipe is shaved off, and finally finished so that the pipe end of the lining pipe is located deeper than the pipe end of the existing pipe, or the length of the lining pipe may be made shorter than the length of the existing pipe from the beginning so that the pipe end is located deeper than the pipe end of the existing pipe.

[0029] Further, in the step of installing the pipe end member, the pressing of the covering member may first be performed toward the inner peripheral surface of the lining pipe, and then the pressing toward the inner peripheral surface of the existing pipe may be performed. Conversely, the pressing toward the inner peripheral surface of the existing pipe may be performed first, and then the pressing toward the inner peripheral surface of the lining pipe may be performed. Alternatively, the pressing toward the inner peripheral surface of the existing pipe and the pressing toward the inner peripheral surface of the lining pipe may be performed at the same timing.

[0030] Furthermore, the pressing of the covering member in the step of installing the pipe end member may be a mode in which the covering member is pressed outward by the pressing member due to a force pushing the pressing member toward the back side.

[0031] Also, in the above-described method for constructing a pipe structure, it may include a locking portion removing step of removing the locking portion that was provided on the covering member installed in the step of installing the pipe end member and that was bent outward at the edge on the inner peripheral surface of the existing pipe.

[0032] After the step of installing the pipe end member is completed, if the locking portion becomes an obstacle, the locking portion removing step may be performed. For example, there may be a case where the tip bent outward of the locking portion protrudes further outward from the outer peripheral surface of the existing pipe and becomes an obstacle. In the locking portion removing step, the entire locking portion may be removed, or only a part of the locking portion may be removed.

[0033] Alternatively, in the above-described method for constructing a pipe structure, a joint member installing step of fixing one end side of a joint member that connects an end portion on the outer peripheral surface of the existing pipe and an end portion of another pipe to the end portion on the outer peripheral surface of the existing pipe and fixing the other end side to the end portion of the other pipe, and installing the joint member; and a water stop material filling step of filling a gap between the tip and the inner peripheral surface of the joint member, which is generated by the tip of the locking portion that was bent outward at the edge on the inner peripheral surface of the existing pipe being pressed by the inner peripheral surface of the joint member installed in the joint member installing step, with a water stop material.

[0034] In this method for constructing a pipe structure, the tip of the locking portion in the covering member protrudes further outward from the outer peripheral surface of the existing pipe, and a sufficient locking amount of the locking portion is ensured. Further, since the tip is pressed by the inner peripheral surface of the joint member, the sealing property with the inner peripheral surface of the joint member is enhanced. Furthermore, the sealing property is further enhanced by filling the waterstop material in the waterstop material filling step.

Advantages of the Invention

[0035] According to the present invention, it is possible to provide a pipe end member in which the end portion of the inner peripheral surface of the outer pipe is not exposed, a pipe structure having the pipe end member, and a method for constructing the pipe structure.

Brief Description of the Drawings

[0036]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0037] Embodiments of the present invention will be described with reference to the following drawings.

[0038] FIG. 2 is a plan view schematically showing a site for constructing a pipe structure.

[0039] This FIG. 2 shows the site around the intersection IS where a wide road R1 runs in the vertical direction and a narrow road R2 runs in the horizontal direction. The wide road R1 has a large traffic volume and it is difficult to stop traffic or regulate lanes. On the other hand, the narrow road R2 has a small traffic volume and it is possible to stop traffic.

[0040] The aged existing pipe EP extends along the narrow road R2 under the narrow road R2. Therefore, at the intersection IS, it extends across under the wide road R1. In FIG. 2, the left side is the upstream side and the right side is the downstream side.

[0041] FIG. 3(a) is a flowchart showing a method for constructing a pipe structure.

[0042] In the pipe structure construction method shown in FIG. 3(a), first, a new pipe to replace the existing pipe EP is buried (step S10). At the site shown in FIG. 2, the narrow road R2 is closed to traffic and the new pipe is buried parallel to the existing pipe EP. In the part of the narrow road R2 upstream of the intersection IS, the upstream new pipe NP1 is buried, and in the part of the narrow road R2 downstream of the intersection IS, the downstream new pipe NP2 is buried. In FIG. 2, the soil has been returned to the location where the upstream new pipe NP1 is buried, and the soil has also been returned to the location where the downstream new pipe NP2 is buried. In this FIG. 2, the buried pipes are shown by two-dot chain lines.

[0043] Since it is difficult to block traffic or regulate lanes on the wide road R1, it is impossible to newly bury a new pipe within the intersection IS. Without excavating the existing pipe, a new lining pipe is provided on the inner peripheral surface of the existing pipe while leaving it buried. The lining pipe may be passed through the existing pipe by being pulled in or by being inserted in reverse. The entrance side when passing the lining pipe into the existing pipe is referred to as the starting side, and the exit side is referred to as the arrival side. Either the upstream side or the downstream side with respect to the intersection IS becomes the starting side, and the other side becomes the arrival side. In the following description, the upstream side with respect to the intersection IS is the starting side, and the downstream side with respect to the intersection IS is the arrival side.

[0044] In step S20 following step S10, a starting-side vertical hole VH1 is excavated at a position shifted upstream from the intersection IS, and an arrival-side vertical hole VH2 is excavated at a position shifted downstream from the intersection IS. Note that either the starting-side vertical hole VH1 or the arrival-side vertical hole VH2 may be excavated first, or they may be excavated simultaneously. Also, either step S10 or step S20 may be carried out first, or they may be carried out simultaneously. In FIG. 3, the edges of the vertical holes VH1 and VH2 are shown by a one-dot chain line. By providing the upstream vertical hole VH1, the downstream end of the upstream new pipe NP1 is dug up, and also the portion of the existing pipe EP upstream of the intersection IS is dug up. Also, by providing the downstream vertical hole VH2, the upstream end of the downstream new pipe NP2 is dug up, and also the portion of the existing pipe EP downstream of the intersection IS is dug up.

[0045] In the subsequent step S30, the existing pipe EP dug up by the vertical holes VH1 and VH2 is cut, and a part of the existing pipe EP is removed. In FIG. 2, the hatched portion is the removed portion. In this step S30, it is a process of cutting out the existing pipe portion EPL where the lining pipe is to be provided, and the starting side end and the reaching side end are formed. Upstream of the existing pipe portion EPL, the upstream existing pipe EP1 remains buried, and downstream of the existing pipe portion EPL, the downstream existing pipe EP2 remains buried. Both the upstream existing pipe EP1 and the downstream existing pipe EP2 remain buried without being removed.

[0046] In step S40, the lining pipe is drawn into the existing pipe portion EPL.

[0047] Here, the lining pipe will be described in detail. The lining pipe is a cylindrical one impregnated with an uncured curable resin (for example, a thermosetting resin, a photocurable resin, etc.), and is prepared in advance at the factory by the following procedure. First, a cylindrical base hose with an outer film layer located on the outside and a base material layer located inside the outer film layer, and a cylindrical calibration hose with an extension layer located on the outside and a base material layer located inside the extension layer are prepared separately, and the base material layers of each are impregnated with a thermosetting resin. Next, the calibration hose is reversely inserted into the inside of the base hose impregnated with the thermosetting resin in the factory. In the reverse insertion, the calibration hose with the base material layer located inside is inserted into the inside of the base hose while turning it so that the base material layer comes to the outside. The calibration hose is inserted into the inside of the base hose from one end side of the base hose and is reversely inserted in the factory by the force of air or water. Since the calibration hose is thinner than the base hose, the reverse insertion is easily performed. By reversely inserting the calibration hose, the base material layer of the base hose and the base material layer of the calibration hose come into contact, and a lining pipe in which two cylindrical members, the base hose and the calibration hose, are integrated is completed. The outermost surface of the lining pipe is constituted by the outer film layer and its innermost surface is constituted by the extension layer, and a base material layer impregnated with a thermosetting resin is disposed between the outer film layer and the extension layer. Thereafter, a steam supply tube for supplying steam for heating the lining pipe is inserted inside the extension layer. The completed lining pipe can be stored at a low temperature in a flattened, accordion-folded or wound state. The lining pipe is transported to the construction site by a cold storage vehicle in a folded or wound state and is used in step S40.

[0048] In step S40, a winch (not shown) is installed in the vertical hole VH2 on the arrival side. Subsequently, the rear end of the draw wire wound around the winch via a pulley is inserted from the arrival side end to the departure side end of the existing pipe portion EPL, and the draw wire is passed through the existing pipe portion EPL.

[0049] Bind the leading end portion of the lining pipe with a binding wire, and connect the binding wire to the rear end of the leading-in wire that has penetrated to the leading end of the existing pipe portion EPL. Use a winch (not shown) installed in the vertical hole VH2 on the reaching side to wind up the leading-in wire and draw the lining pipe into the existing pipe portion EPL from the leading end of the existing pipe portion EPL. When the leading end portion of the lining pipe bound with the binding wire emerges from the reaching side end of the existing pipe portion EPL, stop the winch to complete the drawing-in.

[0050] In step S50, remove the binding wire from the lining pipe and seal each of the open ends on both sides of the lining pipe that has penetrated the existing pipe portion EPL. Inside the lining pipe, a steam supply tube passes from the leading end to the reaching end. In step S50, supply normal-temperature air from the steam supply tube into the lining pipe to inflate the lining pipe and expand its diameter. When the lining pipe is sufficiently inflated, the outer film layer of the lining pipe is pressed against the inner peripheral surface of the existing pipe portion EPL.

[0051] FIG. 4 is a cross-sectional view schematically showing the state in which the lining pipe heating (step S60) shown in FIG. 3(a) is being executed. The left side of the figure is the leading side and the right side is the reaching side. In this FIG. 4, vehicles V1 and V2 traveling to and from the intersection IS through a wide road are shown. Also shown is a triangular cone TC for preventing vehicles from entering the narrow road R2.

[0052] Also, FIG. 4 shows a state in which a plurality of cracks C1 to C4 have occurred in the existing pipe portion EPL.

[0053] Figure 4 also shows a lining pipe LP that has been expanded in a state of penetrating an existing pipe portion EPL. A steam supply tube 36 passes through the central portion of this lining pipe LP. The steam supply tube 36 shown in Figure 4 is provided with round holes 362 having a diameter of about 1 cm at intervals of 1 m along the extending direction, and a slit hole 361 having a width of several cm and a length of about 10 cm to 20 cm is provided at the end on the reaching side. Further, a starting side jig 34 is arranged at the starting side end of the lining pipe LP, and a reaching side jig 35 is arranged at the reaching side end. The starting side jig 34 includes a plug member 341, a starting side tightening member 342, and a tube tightening member 343. The plug member 341 has a steam supply port 3411 and a steam discharge port 3412. This plug member 341 is fixed to the opening end on the starting side of the lining pipe LP by the starting side tightening member 342, and closes the opening on the starting side of the lining pipe LP except for the steam supply port 3411 and the steam discharge port 3412. The steam supply tube 36 is fixed to the steam supply port 3411 by the tube tightening member 343. The reaching side jig 35 includes a fastening drum 351 and a reaching side tightening member 352. The fastening drum 351 is a cylindrical rigid body. The reaching side end of the lining pipe LP and the reaching side end of the steam supply tube 36 are tightened by the reaching side tightening member 352 on the outer peripheral surface of the rigid fastening drum 351, and the opening on the reaching side of the lining pipe LP and the opening on the reaching side of the steam supply tube 36 are both sealed. Note that, as the lining pipe LP, one with the reaching side end pre-closed may be used. Similarly, as the steam supply tube 36, one with the reaching side end pre-closed may be used.

[0054] Near the entrance of the vertical hole VH1 on the starting side shown in FIG. 4, a boiler 31, a compressor 32, a mixing device 33, and an exhaust device 38 are installed. From the boiler 31, superheated steam heated to, for example, over 100°C is sent out. Note that the steam sent out from the boiler 31 may be saturated steam. The compressor 32 compresses and sends out outside air (air). The superheated steam sent out from the boiler 31 and the outside air sent out from the compressor 32 are both supplied to the mixing device 33 and mixed. Hereinafter, the gas mixture of superheated steam and outside air mixed and sent out by the mixing device 33 is referred to as heating steam. A steam valve 311 is provided in the pipe connecting the boiler 31 and the mixing device 33, and an air valve 321 is provided in the pipe connecting the compressor 32 and the mixing device 33. By operating the steam valve 311 and the air valve 321 to adjust the throttle amount, the temperature of the heating steam sent out from the mixing device 33 can be adjusted, or the flow rate of the heating steam can be adjusted. The exhaust device 38 has a soundproofing section 381 and an exhaust duct 382.

[0055] A supply hose SH extends from the mixing device 33. This supply hose SH is connected to the steam supply port 3411 of the plug member 341. Further, an exhaust hose CH extends from the steam discharge port 3412 of the plug member 341. This exhaust hose CH is connected to the soundproofing section 381. An exhaust valve CH1 for adjusting the flow rate of the fluid flowing in the exhaust hose CH is provided in the middle of the exhaust hose CH. In the lining pipe diameter expansion process (step S50) described above, the exhaust valve CH1 and the steam valve 311 are closed, the air valve 321 is opened, the compressor 32 is operated, and outside air (air) is supplied into the lining pipe LP.

[0056] In the lining tube heating process (step S60), heating steam (for example, heating steam at 80°C to 100°C) is used. Inside the lining tube LP in the expanded state, the heating steam blows out from the slit holes 361 and round holes 362 provided in the steam supply tube 36, and the lining tube LP is maintained in a state of being pressed against the inner peripheral surface of the existing pipe portion EPL and is heated by the heating steam. As a result, the curing of the thermosetting resin impregnated in the lining tube LP is started.

[0057] Note that a drain discharge pipe 37 is inserted into the reaching side end of the lining tube LP. In FIG. 4, for the sake of illustration, the drain discharge pipe 37 is depicted as being inserted into the upper part of the lining tube LP, but actually the drain discharge pipe 37 is inserted into the lower end part of the lining tube LP. The heating steam is deprived of a certain amount of heat by the lining tube LP, and thus a part of it changes into drain inside the lining tube LP. A pipe provided with a valve 371 is connected to the drain discharge pipe 37. By opening the valve 371, the drain generated inside the lining tube LP is discharged to the outside of the lining tube LP.

[0058] The heating steam supplied from the steam supply tube 36 on the reaching side of the lining tube LP flows inside the lining tube LP toward the steam discharge port 3412 in the plug member 341 on the starting side, and its temperature gradually decreases. Then, it is sent into the soundproofing part 381 through the exhaust hose CH from the steam discharge port 3412. The soundproofing part 381 has an internal space with a cross-sectional area larger than the cross-sectional area of the exhaust hose CH and is also provided with a soundproofing material. The heating steam has sound waves such as the boiling sound of the boiler 31 on it, and also generates an air release sound. The soundproofing part 381 is for silencing these sounds. The heating steam that has passed through the soundproofing part 381 is exhausted into the atmosphere from the exhaust duct 382.

[0059] In step S60, the temperature of the lining pipe LP is measured at each of the end on the reaching side and the end on the starting side of the lining pipe LP. Due to the heat generation during the curing of the thermosetting resin, the temperature of each end of the lining pipe LP once rises, but then starts to decrease. When the temperature of the lining pipe LP turns from the temperature rise to the temperature decrease and settles at a substantially constant temperature, the curing of the thermosetting resin is completed to a sufficient level. From this state, heating steam at a temperature higher than the heating steam for completing the curing (for example, 100°C to 105°C) is supplied. By doing so, the strength of the thermosetting resin can be increased. The heating time by the heating steam for increasing the strength is obtained in advance through experiments, and when that heating time elapses, step S60 ends.

[0060] According to the lining pipe heating process (step S60) described above, with the lining pipe LP pressed against the inner peripheral surface of the existing pipe portion EPL, the impregnated thermosetting resin cures and increases in strength, and a new self-supporting pipe path is formed by the lining pipe LP inside the inner peripheral surface of the existing pipe portion EPL. The existing pipe portion EPL corresponds to an example of an outer pipe, and the lining pipe LP formed as a new self-supporting pipe path corresponds to an example of an inner pipe.

[0061] Thereafter, by stopping the boiler 31 and closing the steam valve 311, outside air (normal temperature air) is supplied instead of the heating steam to cool the cured lining pipe LP.

[0062] In step S70 shown in FIG. 3, the pipe ends are cut to open both ends of the lining pipe LP. The lining pipe LP shown in FIG. 4 protrudes both on the starting side and the reaching side more than the existing pipe portion EPL. In this step S70, the protruding portions at both ends of the cured lining pipe LP are cut.

[0063] Subsequently, an end removal process of the lining pipe (step S80) is performed. In this step S80 process, the end of the cured lining pipe LP is shaved off with a grinder or the like so that the pipe end of the cured lining pipe LP is located deeper than the pipe end of the existing pipe portion EPL. By doing so, the end portion on the inner peripheral surface of the existing pipe portion EPL is exposed. As a result, a lining pipe LP is completed in which the inner peripheral surface of the existing pipe portion EPL that was embedded and used as an internal pressure pipe is lined and the pipe end is located deeper than the pipe end of the existing pipe portion EPL. Steps S40 to S80 correspond to an example of the lining pipe forming process.

[0064] Note that if steps S40 to S70 are performed using a lining pipe shorter than the length of the existing pipe portion EPL so that the pipe end of the cured lining pipe is initially located deeper than the pipe end of the existing pipe portion EPL, the implementation of step S80 becomes unnecessary.

[0065] Subsequently, an installation process of the pipe end member (step S90) is executed.

[0066] FIG. 3(b) is a flowchart showing in detail the installation process of the pipe end member (step S90) shown in FIG. 3(a).

[0067] First, a packing member is installed (step S91). The packing member corresponds to an example of a covering member.

[0068] FIG. 5 is a diagram showing the packing member of the present embodiment. Also in this FIG. 5, as in FIG. 1, the left side of the figure is the pipe end side and the right side is the deeper side.

[0069] FIG. 5(a) shows only the upper part of the cross section of each of the lining pipe LP whose end has been shaved off by step S80 and the existing pipe portion EPL whose end on the inner peripheral surface is exposed. The thickness of the pipe wall of the existing pipe portion EPL varies according to the diameter of the existing pipe, but is, for example, 5 mm or more and 10 mm or less. The thickness of the pipe wall of the lining pipe LP also varies according to the diameter of the existing pipe, but is, for example, 10 mm or more and 20 mm or less.

[0070] Also, in FIG. 5(a), only the upper part of the cross-section of the packing member 11 (corresponding to the covering member) of the present embodiment is shown under the double pipe WP composed of the lining pipe LP (corresponding to the inner pipe) and the existing pipe portion EPL (corresponding to the outer pipe). The thickness of the packing member 11 is about 5 mm, but in FIG. 5, the relative relationship of the thicknesses of the respective members is shown ignoring it. The packing member 11 shown in FIG. 5(a) is made of rubber and has extensibility and flexibility. The packing member 11 has a seal portion 110 and a locking portion 111 that locks to the wall thickness surface EPL2 at the pipe end EPL1 of the existing pipe portion EPL. Note that the wall thickness surface EPL2 is the surface between the inner peripheral surface EPLi and the outer peripheral surface EPLo at the pipe end EPL1.

[0071] In FIG. 5(b), the packing member 11 is attached by an adhesive from the entire circumference of the end portion on the inner peripheral surface EPLi of the existing pipe portion EPL to the entire circumference of the end portion on the inner peripheral surface LPi of the lining pipe LP. The locking portion 111 of the packing member 11 shown in FIG. 5(b) is locked to the wall thickness surface EPL2 of the existing pipe portion EPL. This locking portion 111 only needs to be locked to the wall thickness surface EPL2 and does not necessarily need to be attached, but the locking force is enhanced when it is attached to the wall thickness surface EPL2. Also, the locking portion 111 is made of the same rubber as the seal portion 110, but the locking force can be further enhanced by making the locking portion 111 less extensible than the seal portion 110 (for example, making the whole a rigid body or including a rigid body).

[0072] As shown in FIG. 5(a), the seal portion 110 of the packing member 11 has a truncated cone shape in which the diameter gradually decreases toward the back side. This seal portion 110, as shown in FIG. 5(b), is attached from the entire circumference of the end portion on the inner peripheral surface EPLi of the existing pipe portion EPL to the entire circumference of the end portion on the inner peripheral surface LPi of the lining pipe LP, so that it follows the step st (the difference in the wall thickness of the lining pipe LP) between the inner peripheral surface EPLi of the existing pipe portion EPL and the inner peripheral surface LPi of the lining pipe LP. That is, a stepped portion 113 is also formed in the seal portion 110 (packing member 11).

[0073] The locking portion 111 shown in Fig. 5(b) is bent outward at the edge Eg (see Fig. 5(a)) on the inner peripheral surface EPLi of the existing pipe portion EPL, and extends by the thickness of the thickness surface EPL2. Therefore, the bent tip 1111 of the locking portion 111 coincides with the outer peripheral surface EPLo of the existing pipe portion EPL. Here, the outer side means the radially outer side when the center axis side of the existing pipe portion EPL is defined as the inner side.

[0074] In the installation process (step S90) of the pipe end member shown in Fig. 3(b), when the packing member 11 is installed, the expansion band 12 is fitted (step S92).

[0075] The expansion band 12 of the present embodiment is also a stainless-steel C-shaped one, similar to the expansion band 932 described with reference to Fig. 1, and is attached in order from the back side toward the pipe end side. This expansion band 12 corresponds to an example of the first pressing member and the second pressing member. In Fig. 5(c), the expansion band 12 is fitted from the inner side to the back side of the packing member 11. When fitting the expansion band 12 from the inner side, with the C-shaped expansion band 12 expanded by an expansion tool (not shown), a fixing plate (not shown) that closes the C-shaped gap is inserted into the C-shaped gap. By inserting the fixing plate, the expansion band 12 maintains the expanded state even when the expansion tool is removed and presses the packing member 11 outward. The fixing plate that closes the C-shaped gap is inserted while being tapped with a hammer from the pipe end side toward the back side. Although the expansion band 12 is in a state of being expanded by an expansion tool (not shown), it is further expanded by the insertion of the fixing plate. Even when an impact of tapping the fixing plate with a hammer is applied, the packing member 11 of the present embodiment is prevented from shifting entirely toward the back side because the locking portion 111 is locked to the thickness surface EPL2 of the existing pipe portion EPL. Even when a plurality of expansion bands 12 are fitted in order from the back side, the entire packing member 11 is prevented from shifting toward the back side.

[0076] FIG. 5(d) is a diagram showing a state where the diameter-expanding bands 12 are fitted at four locations and the installation process of the pipe end member 10 is completed. In the packing member 11 shown in FIG. 5(d), the locking portion 111 is locked to the thickness surface EPL2 of the existing pipe portion EPL, and the entire circumference of the end portion on the inner peripheral surface EPLi of the existing pipe portion EPL is covered by the seal portion 110, and there is no exposed portion.

[0077] Note that instead of the packing member 11 shown in FIG. 5(a), a two-stage cylindrical structure in which the stepped portion 113 shown in FIG. 5(b) is formed in advance may be used for the seal portion 110. However, in the removal of the end portion of the lining pipe LP at the site (step S80 shown in FIG. 3(a)), it may be difficult to accurately cut off the end portion of the lining pipe LP by a predetermined length from the pipe end EPL1 of the existing pipe portion EPL toward the back side, and the position of the pipe end LP1 of the lining pipe LP may shift back and forth. In this case, since it is inconvenient if the pre-formed stepped portion 113 is located deeper than the actual pipe end LP1 position of the lining pipe LP, it is preferable to provide the stepped portion 113 closer to the pipe end EPL1 of the existing pipe portion EPL. Also, a cylindrical seal portion 110 having the same diameter in the axial direction (extending direction) may be used. However, the conical frustum-shaped seal portion 110 in which the diameter gradually decreases toward the back side as in the present embodiment can more easily insert the packing member 11 from the pipe end EPL1 of the existing pipe portion EPL to reach the inner peripheral surface LPi of the lining pipe LP. When the seal portion 110 has such a conical frustum shape, when inserting the fixing plate into the C-shaped gap of the diameter-expanding band 12, the diameter-expanding band 12 is more likely to shift toward the back side. However, since the locking portion 111 is provided, there is no worry about shifting, and the ease of inserting the packing member 11 becomes prominent. Note that the seal portion 110 may be such that a portion with the same diameter and a portion with a gradually decreasing diameter are combined, and overall, the diameter is smaller on the back side (farther side) than on the pipe end side (front side).

[0078] In Fig. 2, a lining pipe LP is installed on the inner peripheral surface side of the cut existing pipe portion EPL as indicated by the dotted line. Pipe end members 10 are installed at both ends of the double pipe WP composed of the lining pipe LP and the existing pipe portion EPL by the pipe end member installation process described with reference to Fig. 3(b), but are not shown in Fig. 2 for the sake of simplicity.

[0079] In the pipe structure construction method shown in Fig. 3(a), a connection process (step S100) of the double pipe WP with the pipe end member 10 installed and the new pipe NP is carried out.

[0080] In this step S100, joint members (see Fig. 6(b)) are installed at both ends of the double pipe WP with the pipe end member 10 installed. Also, joint members are installed at the downstream end of the upstream new pipe NP1, which has been excavated by excavating the starting-side vertical hole VH1 shown in Fig. 2. Further, joint members are installed at the upstream end of the downstream new pipe NP2, which has been excavated by excavating the arrival-side vertical hole VH2. Subsequently, a cast iron upstream connection pipe CP1 (see Fig. 2) is installed between the joint member on the starting side of the double pipe WP and the joint member installed at the downstream end of the upstream new pipe NP1. Also, a cast iron downstream connection pipe CP2 (see Fig. 2) is installed between the joint member on the arrival side of the double pipe WP and the joint member installed at the upstream end of the downstream new pipe NP2. When the connection process (step S100) of the double pipe WP and the new pipe NP is completed, a pipe structure PS in which the upstream new pipe NP1, the upstream connection pipe CP1, the double pipe WP, the downstream connection pipe CP2, and the downstream new pipe NP2 shown in Fig. 2 are connected is constructed. When the pipe structure PS is constructed, both the starting-side vertical hole VH1 and the arrival-side vertical hole VH2 are filled, and the narrow road R2 is paved.

[0081] In the pipe end member 10 described with reference to FIG. 5, the bent tip 1111 of the locking portion 111 coincides with the outer peripheral surface EPLo of the existing pipe portion EPL, and the locking amount of the locking portion 111 is sufficiently ensured. However, since the wall thickness of the existing pipe portion EPL varies depending on the existing pipe, the bent tip 1111 of the locking portion 111 does not necessarily coincide with the outer peripheral surface EPLo of the existing pipe portion EPL, and it may be the case that it does not reach the outer peripheral surface EPLo (when it is shorter than the wall thickness of the existing pipe portion EPL). Alternatively, in order to ensure the maximum locking amount of the locking portion 111, the length of the locking portion 111 may be made longer.

[0082] FIG. 6(a) is a cross-sectional view showing a pipe end member in a mode in which the bent tip of the locking portion protrudes further outward from the outer peripheral surface of the existing pipe portion. In the following description, components having the same name as the components described so far will be described with the same reference numerals as those used so far.

[0083] The locking portion 111 shown in FIG. 6(a) is only locked to the thickness surface EPL2 (see FIG. 5(a)) and is not adhered. Since the packing member 11 shown in FIG. 6(a) is also made of rubber and has flexibility, the locking portion 111 can bend to the side opposite to the back side (front side) as shown by the arrow in FIG. 6(a).

[0084] Further, on the outer peripheral surface EPLo of the existing pipe portion EPL shown in FIG. 6(a), an outer peripheral rib EPL3 protruding outward extends in the circumferential direction.

[0085] FIG. 7 is a flowchart showing two modification examples of the installation process of the pipe end member shown in FIG. 3(a) and the connection process of the new pipe and the double pipe.

[0086] FIG. 7 shows steps S91 and S92 in the installation process (step S90) of the pipe end member 10 shown in FIG. 3(b). In the first modification shown on the left side, following step S92, a connection process (step S100) of the newly installed pipe and the double pipe is carried out. First, the joint member 20 is connected in a state where the locking portion 111, whose tip 1111 further protrudes outward from the outer peripheral surface EPLo of the existing pipe portion EPL, is inclined (step S101).

[0087] FIG. 6(b) is a cross-sectional view showing a state where the joint member 20 is attached to the outer peripheral surface EPLo of the existing pipe portion EPL.

[0088] A half-split fixed flange FR1 is locked to the outer peripheral rib EPL3 provided on the outer peripheral surface EPLo of the existing pipe portion EPL. The half-split fixed flange FR1 is a flange divided into a 1 / 2 arc so as to sandwich the outer peripheral surface EPLo of the existing pipe portion EPL from the outside. Further, a loose flange FR2 is externally fitted to the side of the pipe end EPL1 (see FIG. 6(a)) on the outer peripheral surface EPLo of the existing pipe portion EPL. The joint member 20 is externally fitted to the outer peripheral surface EPLo of the existing pipe portion EPL so as to face the loose flange FR2. The joint member 20 is made of cast iron, and a first flange 21 is provided at one end and a second flange 22 is provided at the other end. The first flange 21 sandwiches two rubber rings 25 between it and the loose flange FR2, and the screw rod 26 passes through the first flange 21, the loose flange FR2, and the half-split fixed flange FR1. The screw rods 26 are arranged at intervals in the circumferential direction over the entire circumference of each flange. Nuts 271 to 273 are provided for each flange on the screw rod 26, and by tightening these nuts 271 to 273, the joint member 20 is fixed to the double pipe WP.

[0089] When the joint member 20 is set on the double pipe WP, the tip 1111 of the locking portion 111 that protrudes further outward from the outer peripheral surface EPLo is pressed by the inner peripheral surface 20i of the joint member 20 and is deflected. As shown in FIG. 6(b), the locking portion 111 assumes an inclined posture. The tip 1111 of the locking portion 111 is pressed by the inner peripheral surface 20i of the joint member 20, so that the sealing property with the inner peripheral surface 20i is enhanced.

[0090] Subsequently, in step S102 shown in FIG. 7, a waterstop material is filled around the inclined locking portion 111. In FIG. 6(b), a waterstop material 28 shown in gray is filled in the gap between the tip 1111 of the locking portion 111 and the inner peripheral surface 20i of the joint member 20, and the above-mentioned sealing property is further enhanced.

[0091] In the subsequent step S104, a connecting pipe is connected to the new pipe. For example, a cast iron connecting pipe such as the upstream connecting pipe CP1 or the downstream connecting pipe CP2 shown in FIG. 2 is connected to a new cast iron pipe such as the upstream new pipe NP1 or the downstream new pipe NP2 shown in FIG. 2 via a joint member similar to the joint member 20 shown in FIG. 6(b).

[0092] Next, in step S105, a connecting pipe is connected to the joint member 20 connected to the double pipe WP. As shown in FIG. 6(b), a step portion 23 for receiving the tip of the connecting pipe is provided on the inner peripheral surface 20i of the joint member 20 in the circumferential direction. The tip of the connecting pipe (the thickness surface of the pipe wall of the connecting pipe) abuts against this step portion 23, and the connecting pipe is connected to the joint member 20 by connecting the second flange 22 of the joint member 20 and the flange provided on the outer peripheral surface of the connecting pipe. When the implementation of step S105 is completed, the connection process (step S100) between the new pipe and the double pipe is completed.

[0093] On the other hand, in the second modification shown on the right side of FIG. 7, following step S92, step S93 is implemented. Step S93 is a step of removing the entire locking portion 111 whose tip 1111 protrudes further outward from the outer peripheral surface EPLo of the existing pipe portion EPL.

[0094] FIG. 6(c) is a cross-sectional view showing the pipe end member 10 after step S93 is performed.

[0095] FIG. 6(c) shows the packing member 11 with the entire locking portion 111 removed. The entire circumference of the end of the inner peripheral surface EPLi of the existing pipe portion EPL shown in FIG. 6(c) is covered by the seal portion 110 from the edge Eg, and there is no exposed portion. However, the thickness surface EPL2 of the existing pipe portion EPL is exposed. In the partial removal of the existing pipe at the site (step S30 shown in FIG. 3(a)), the cut surface (thickness surface EPL2) at the pipe end EPL1 of the existing pipe portion EPL may not be a clean cut surface. In the case of the locking portion 111 shown in FIG. 5 or the locking portion 111 shown in FIG. 6(b), there is an advantage that the thickness surface EPL2 can be hidden, and furthermore, there is no risk of foreign matter derived from the thickness surface EPL2 mixing into the pressure fluid flowing in the lining pipe LP. From these advantages, although the removal work becomes slightly complicated, only the portion of the locking portion 111 that protrudes outward from the outer peripheral surface EPLo of the existing pipe portion EPL may be removed.

[0096] In the second modification, when the implementation of step S93 is completed, the installation process (step S90) of the pipe end member 10 ends, and the connection process (step S100) of the new pipe and the double pipe starts. In this step S100, as shown in FIG. 6(c), the joint member 20 is connected to the double pipe WP (step S103). Thereafter, steps S104 and S105 are performed, and the connection process (step S100) of the new pipe and the double pipe ends.

[0097] Next, with reference to FIG. 5, a third modification will be described. This third modification is a pipe end member 10 installed from the end portion on the inner peripheral surface EPLi of the outer pipe (existing pipe portion EPL) to the end portion on the inner peripheral surface LPi of the inner pipe (lining pipe LP) disposed on the inner peripheral surface EPLi side of the outer pipe (existing pipe portion EPL) and having a pipe end located deeper than the pipe end EPL1 of the outer pipe (existing pipe portion EPL). The pipe end member 10 includes a covering member (packing member 11) that covers from the entire circumference of the end portion on the inner peripheral surface LPi of the outer pipe (existing pipe portion EPL) to the entire circumference of the end portion on the inner peripheral surface LPi of the inner pipe (lining pipe LP), a first pressing member (the two left-side expanded diameter bands 12 shown in FIG. 5(d)) that presses the covering member (packing member 11) toward the inner peripheral surface LPi of the outer pipe (existing pipe portion EPL), and a second pressing member (the two right-side expanded diameter bands 12 shown in FIG. 5(d)) that presses the covering member (packing member 11) toward the inner peripheral surface LPi of the inner pipe (lining pipe LP). The covering member (packing member 11) is provided with a locking portion (not shown) that locks to the step st (the difference corresponding to the thickness of the wall of the lining pipe LP) between the outer pipe (existing pipe portion EPL) and the inner pipe (lining pipe LP).

[0098] Note that the covering member (packing member 11) has a base portion (sealing portion 110) having extensibility, and the locking portion has inferior extensibility compared to the base portion and is preferably a rigid body. By doing so, even when a force is applied to shift the covering member (packing member 11) deeper, the locking portion is likely to be locked to the step st, and the locking of the step st by the locking portion is maintained.

[0099] Next, summarizing the internal pressure pipe renewal method described with reference to FIG. 2, the existing pipe EP that was buried and used as an internal pressure pipe is divided into a lining portion (existing pipe portion EPL), an upstream portion (upstream existing pipe EP1) upstream of the lining portion, and a downstream portion (downstream existing pipe EP2) downstream of the lining portion. A dividing step (step S30 shown in FIG. 3(a)), a lining step of providing a lining pipe LP that backs the inner peripheral surface EPLi of the lining portion (existing pipe portion EPL) (steps S40 to S60 shown in FIG. 3(a)), a new upstream portion embedding step of embedding a new upstream portion (upstream new pipe NP1) instead of the upstream portion (upstream existing pipe EP1) (step S10 shown in FIG. 3(a)), a new downstream portion embedding step of embedding a new downstream portion (downstream new pipe NP2) instead of the downstream portion (downstream existing pipe EP2) (step S10 shown in FIG. 3(a)), an upstream connection step of connecting the upstream pipe end of the lining pipe LP and the new upstream portion (upstream new pipe NP1) embedded in the new upstream portion embedding step (step S100 shown in FIG. 3(a)), and a downstream connection step of connecting the downstream pipe end of the lining pipe LP and the new downstream portion (downstream new pipe NP2) embedded in the new downstream portion embedding step (step S100 shown in FIG. 3(a)). The internal pressure pipe renewal method is characterized by having these steps.

[0100] The lining portion (existing pipe portion EPL) is applied to a portion where it is difficult to dig up and replace with a new pipe over the entire length due to circumstances such as heavy traffic or the presence of buildings. In the lining portion (existing pipe portion EPL), only the upstream end and the downstream end of the lining portion need to be dug up. That is, the lining portion is the portion connecting between the upstream portion that can be dug up and the downstream portion that can be dug up.

[0101] The lining step may be a step of pulling the uncured lining pipe LP into the lining portion in a crushed state and then curing the lining pipe while pressing it against the inner peripheral wall of the lining portion.

[0102] The new upstream partial embedding process may be carried out at any timing as long as it is completed before the upstream connection process is carried out. Similarly, the new downstream partial embedding process may be carried out at any timing as long as it is completed before the downstream connection process is carried out. The lining process may be carried out at any timing as long as it is after the splitting process and before the upstream connection process and the downstream connection process are carried out.

[0103] The present invention is not limited to the embodiments and modifications described so far, and various changes can be made within the scope described in the claims. For example, the pipe end member 10 can be used not only for a double pipe configured such that the outer pipe is an existing pipe and the inner pipe is a lining pipe, but also for a double pipe configured with a new outer pipe and a new inner pipe that is not limited to being lined. As an example, it may be a pipe end member for sealing a slight gap generated between the outer pipe and the inner pipe of a double pipe in which the outer pipe is a pipe for ensuring rigidity and the inner pipe is a pipe made of a material that is not eroded by the pressure fluid.

[0104] Also, even if it is a constituent element included only in the description of the embodiments and the description of the modifications described above, the constituent element may be applied to the embodiments and other modifications.

Explanation of reference numerals

[0105] 10 Pipe end member 11 Packing member (covering member) 110 Sealing portion 111 Locking portion 1111 Tip 12 Expanding band (first pressing member, second pressing member) EP Existing pipe (outer pipe) EP1 Upstream existing pipe EP2 Downstream existing pipe EPL Existing pipe portion EPLi Inner peripheral surface EPLo Outer peripheral surface EPL1 Pipe end EPL2 thickness surface Eg edge LP lining pipe (inner pipe) LPi inner peripheral surface WP double pipe NP new pipe NP1 upstream new pipe NP2 downstream new pipe PS pipe structure

Claims

1. A pipe end member is provided from an end of an inner peripheral surface of an outer pipe to an end of an inner peripheral surface of an inner pipe arranged on the inner peripheral surface side of the outer pipe and having a pipe end located on the inner peripheral surface side of the outer pipe, a cover member that covers an entire circumference of an end portion of an inner circumferential surface of the outer pipe from an entire circumference of an end portion of an inner circumferential surface of the inner pipe; a first pressing member that presses the covering member toward an inner circumferential surface of the outer tube; a second pressing member that presses the covering member toward the inner circumferential surface of the inner tube, A pipe end member, characterized in that the covering member is provided with a locking portion that locks onto a thickness surface between an inner peripheral surface and an outer peripheral surface at the pipe end of the outer pipe.

2. 2. The pipe end member according to claim 1, wherein the engaging portion is bent outwardly at an edge of the inner peripheral surface of the outer pipe and extends a distance equal to or greater than the thickness of the thickness surface.

3. The existing pipes were buried and used as internal pressure pipes, A lining pipe that lines the inner peripheral surface of the existing pipe and has a pipe end located on the inner side of the pipe end of the existing pipe; A pipe structure having a pipe end member installed from an end portion of the inner peripheral surface of the existing pipe to an end portion of the inner peripheral surface of the lining pipe, The pipe end member is provided with a covering member which is pressed against the entire circumference of the end portion on the inner circumferential surface of the existing pipe and is also pressed against the entire circumference of the end portion on the inner circumferential surface of the lining pipe, A pipe structure characterized in that the covering member has an engaging portion that engages with a thickness surface between the inner and outer surfaces at the pipe end of the existing pipe.

4. A joint member is provided to connect an end of the existing pipe to an end of a separate pipe on an outer circumferential surface of the existing pipe, 4. A pipe structure as described in claim 3, characterized in that the engaging portion is bent outward at an end edge on the inner surface of the existing pipe, and the bent tip is pressed down by the inner surface of the coupling member.

5. a lining pipe forming process for lining the inner peripheral surface of an existing pipe that has been buried and used as an internal pressure pipe, and providing a lining pipe whose end is located on the inner side of the end of the existing pipe; a pipe end member installation process for placing a covering member provided with an engagement portion from the entire circumference of the end portion on the inner surface of the existing pipe to the entire circumference of the end portion on the inner surface of the lining pipe, and pressing the covering member toward the inner surface of the existing pipe and also toward the inner surface of the lining pipe with the engagement portion engaged with the thickness surface between the inner and outer surfaces at the pipe end of the existing pipe.

6. The pipe structure construction method according to claim 5, characterized in that it further comprises a fastening portion removal process for removing the fastening portion that was provided on the covering member installed in the pipe end member installation process and that is bent outward at the edge on the inner surface of the existing pipe.

7. a coupling member installation process for installing a coupling member that connects an end portion of the outer circumferential surface of the existing pipe to an end portion of a different pipe by fixing one end side of the coupling member to the end portion of the outer circumferential surface of the existing pipe and fixing the other end side to the end portion of the different pipe; The pipe structure construction method according to claim 5, characterized in that it further comprises a water-stopping material filling process for filling a gap between the tip of the engaging portion bent outward at the edge of the inner surface of the existing pipe and the inner surface of the coupling member installed in the coupling member installation process, which is generated when the tip of the engaging portion is pressed down by the inner surface of the coupling member installed in the coupling member installation process.

Images