Pipe renovation construction method

Abstract

To provide a pipe renovation construction method in which the direction of an inverted end of a pipe renovation tube is changed at the bottom of a manhole and the tube can be easily pushed out into a pipeline.SOLUTION: A pipe renovation construction method of the present invention is a method for renovating a pipeline, in which a pipe renovation tube impregnated with a liquid hardening resin is inverted and inserted into a pipeline connected by a manhole, the pipe renovation tube is attached to a pipe wall of the pipeline, and the hardening resin is cured. In the method, a tip portion of the pipe renovation tube is pre-inverted on the ground in advance, an inverted end is brought into a squeezed state by a clamping tool, the inverted end is introduced into the manhole, the inverted end is pulled or pushed at the bottom of the manhole to change the direction toward the pipeline and extruded into the pipeline, the clamping tool is removed after the extrusion, and subsequently the pipe renovation tube is inverted and inserted into the pipeline by water head pressure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pipe rehabilitation method for aging sewer pipes, agricultural water pipes, industrial water pipes, water pipes, etc., and more specifically to a pipe rehabilitation method that makes it easy to insert the inverted end of a pipe rehabilitation tube introduced into a starting manhole into the pipeline. [Background technology]

[0002] A pipe rehabilitation tube made of tubular resin absorbent material impregnated with liquid hardening resin is inserted inverted into the pipeline and placed along the entire length of the pipeline.Pressure is then applied inside the placed pipe rehabilitation tube, and the hardening resin is hardened by heat or light while it is attached to the pipe wall, forming a plastic pipe inside the pipeline and allowing the aging pipeline to be rehabilitated without excavation.

[0003] In conventional construction methods, a pipe rehabilitation tube is inverted and inserted into the pipeline, but when the tube becomes large, with a diameter of 400 mm or more and a length of 100 m or more, the following problems arise, making construction difficult: As shown in Figure 8, the pipe rehabilitation tube 1 is inverted, its tip is attached to a collar 5, the other inverted end 15 is hung down from the ground into the starting manhole 2, and the inverted end 15 is manually pressed to change its direction so that it faces the pipeline 13. However, because the diameter of the pipe rehabilitation tube 1 is large and it is heavy, this construction is extremely difficult when the space inside the manhole is narrow. Furthermore, as shown in Figure 9, when the pipeline 13 is short, when the end 19 of the pipe rehabilitation tube 1 reaches the collar 5 from the truck position, the air in the air pocket 17 is sucked out from the end 19 by the vacuum pump 18. However, when the pipeline 13 is long and the pipe rehabilitation tube is inserted over a long distance of 100 m or more, the small amount of air mixed in with the liquid hardening resin impregnated in the pipe rehabilitation tube is gradually squeezed out above the inversion head, accumulates inside the uninverted pipe rehabilitation tube 1, and floats above the inversion head, which hinders the insertion of the pipe rehabilitation tube 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-172081 Summary of the Invention [Problem to be solved by the invention]

[0005] The first challenge was to make it easy to turn the inverted end of the pipe rehabilitation tube by approximately 90 degrees and push it out into a pipe installed horizontally at the bottom of a manhole.

[0006] The second challenge is that in the case of long pipe rehabilitation tubes over 100 m in length, air can accumulate in the middle of the tube, making it impossible to insert it in reverse.Therefore, it is necessary to make it possible to remove the air that accumulates in the middle of the length of the pipe rehabilitation tube during inversion insertion at least once or multiple times at a location other than the end. [Means for solving the problem]

[0007] The pipe rehabilitation method of the present invention is a method for rehabilitating a pipeline by inverting and inserting a pipe rehabilitation tube impregnated with a liquid hardening resin into a pipeline connected by a manhole, attaching the pipe rehabilitation tube to the wall of the pipeline, and hardening the hardening resin.The method is characterized in that the tip of the pipe rehabilitation tube is first inverted on the ground, and then the inverted end is tightened using a clamping tool.The inverted end is introduced into the manhole, and the inverted end is turned toward the pipeline by pulling or pushing it at the bottom of the manhole and pushed into the pipeline.After the pushing, the clamping tool is removed, and the pipe rehabilitation tube is then inverted and inserted into the pipeline using head pressure.

[0008] The pulling-in is performed by providing a towing hook at the tip of the fastener and pulling a towing rope hung on the towing hook from the arrival manhole side.

[0009] The pushing is performed by providing a hook pocket in the fastener and pushing the hook pocket with a lateral push jack.

[0010] The method is characterized in that air pockets in the hardening resin that occur as the inverted insertion progresses are vented at the entrance of the manhole, and after the air is vented, the air vent hole is closed.

[0011] The air vent hole is closed by a heat-seal patch. [Effects of the Invention]

[0012] According to the present invention, the inverted end of the pipe rehabilitation tube is squeezed with a clamping tool to make it easy to change direction at the bottom of the manhole and push it out into the pipeline. Because the diameter of the inverted end of the pipe rehabilitation tube is smaller than the diameter of the pipeline, it can be pushed out into the pipeline either by pulling it in or pushing it in.

[0013] A towing hook is provided at the tip of the fastener and the fastener is pulled by a towing rope hung on the towing hook, so that the tip of the pipe rehabilitation tube can be pulled into the pipe line.

[0014] A hook pocket is provided at the tip of the fastener and the hook pocket is pushed in by a lateral push jack, so that the tip of the pipe rehabilitation tube can be pushed into the pipeline.

[0015] Air pockets in the hardening resin that rise to the surface inside the tube for pipe rehabilitation as the inverted insertion progresses are released at the entrance of the manhole, and after the air is released, the air vent hole is closed, so that the air pockets do not collide with the collar and cause delays in the inverted insertion.

[0016] The air vent hole is closed with a heat seal patch, so that the injected water can be prevented from leaking out of the air vent hole within the pipeline. [Brief explanation of the drawings]

[0017] [Figure 1] This is a diagram showing a pipe rehabilitation method according to the present invention, in which a clamping device is attached to the inverted end of a pipe rehabilitation tube, which is then introduced into a manhole, and the inverted end is pushed out into the pipeline at the bottom of the manhole. [Figure 2] This is a diagram showing the inverted end being pulled into the pipeline with a towing rope. [Figure 3] This is a diagram showing the inverted end being pushed into the pipe with a lateral push jack. [Figure 4] FIG. 10 is a diagram showing the fastener attached to the inverted end being removed. [Figure 5] 10 is a diagram showing the state in which the pipe rehabilitation tube starts to move through the pipe. FIG. [Figure 6] FIG. 10 is a diagram showing the removal of air from an air pocket in a pipe rehabilitation tube. [Figure 7] FIG. 7 is a diagram showing how the air vent hole in FIG. 6 is covered with a patch film. [Figure 8] This is a diagram showing how the inverted end of a pipe rehabilitation tube is redirected at the bottom of a manhole using a conventional construction method. [Figure 9] FIG. 10 is a diagram showing how air is removed from an air pocket using a conventional construction method. DETAILED DESCRIPTION OF THE INVENTION [Example]

[0018] The pipe rehabilitation method according to the present invention will be described in detail with reference to the drawings.

[0019] The pipe rehabilitation tube 1 is made by impregnating a liquid hardening resin into a tube made of tubular resin adsorbent material made of polyester felt or polyester felt composited with glass fiber, the outer surface of which is airtightly covered with a plastic film such as polyethylene. As shown in Figure 6, one end of the pipe rehabilitation tube 1 has an air vent hole and a closed end 19, and end 19 has a hook for attaching a hot water shower hose 20.

[0020] As shown in Figure 1, the other end of the pipe rehabilitation tube 1 is inverted in advance by a length equal to the depth of the starting manhole 2 plus the bottom folding part and the height of the collar stand above ground (h: 1m to 15m). From the inverted end 15, a tightening device 4 such as a rope, lashing belt, or bundling belt is used to narrow the lengthwise direction at intervals of 200mm to 1000mm to make it compact.

[0021] Next, as shown in Figure 2, a towing hook 9 is attached to the inverted end 15 using a rope or belt. Alternatively, if the tube is to be pushed into the pipeline 13, a hook pocket 11 is provided as shown in Figure 3. The leading end of the pipe rehabilitation tube 1 is folded back and attached to the collar 5 as shown in Figure 1. Once the end processing as described above is complete, the pipe rehabilitation tube 1 is stored in a water tank (Figure 8, symbol 28) and transported to the construction site by truck 16 as shown in Figure 6.

[0022] At the construction site, as shown in Figure 1, the inverted end 15 is suspended from the top to the bottom of the starting manhole 2 and introduced into the starting manhole 2. As it approaches the bottom of the starting manhole 2, the inverted end 15 is pulled into the pipeline 13 with the towing rope 8 to point it toward the pipeline 13. Alternatively, it may be pushed into the pipeline 13 with a horizontal push jack. At this time, the towing end of the towing rope 8 is pulled by an anchor (not shown) installed in the pipeline 13 or by the winch 6 of the arrival manhole 3. As shown in Figure 4, the fastener 4 is cut with scissors, and as shown in Figure 5, the inverted end 15 is pushed into the pipeline 13, and water is injected into the pipe rehabilitation tube 1 from the water injection hose 14 (see Figure 1), and the inverted insertion proceeds sequentially.

[0023] As shown in Figure 6, as the inversion insertion progresses, a small amount of air mixed in the impregnated liquid hardening resin is squeezed out above the inversion head and accumulates inside the uninverted pipe rehabilitation tube 1, gradually increasing the size of air pocket 17. Then, as air pocket 17 floats above the inversion head, inversion becomes difficult. About halfway along the length (approximately 30 to 100 m), an insertion pipe 22 is inserted into the air pocket above the inversion head of the pipe rehabilitation tube 1 (see Figure 6), or a small cut is made to create an air vent hole 27 (see Figure 7), and the accumulated air is removed using a vacuum pump 18 (see Figure 6).

[0024] As shown in Figure 7, after the air has been removed from the air pocket 17, the air vent holes 27 in the polyethylene film on the outer surface of the pipe rehabilitation tube 1 are sealed with a heat seal patch 24 made of the same type of polyethylene film, heated with a heater 23, and pressed with a pressure roller 25 to restore the tube to an airtight condition. This process is repeated until the final air removal is performed at the end 19, and a hot water shower hose 20 is attached to the end 19. The tube is then turned over in succession until the end 19 reaches the arrival manhole 3.

[0025] Then, hot water is sprayed from the nozzles drilled in the hot water shower hose 20 (see Figure 6) inside the pipe rehabilitation tube 1 inserted into the pipeline 13, and the injected water is heated and turned into hot water, which is then circulated, hardening the liquid hardening resin and forming a plastic pipe without joints along the entire pipeline 13.

[0026] According to the present invention, even if the pipe rehabilitation tube 1 is large, it can be easily turned around in a narrow manhole. By providing an air vent hole in a pipe rehabilitation tube 100 m or longer and venting air in the middle of the length, it can be easily inserted upside down without being affected by buoyancy. [Industrial Applicability]

[0027] The present invention is suitable as a pipe rehabilitation method that can easily push the inverted end of a large-diameter, heavy pipe rehabilitation tube that is inserted into a starting manhole into a horizontal pipeline. [Explanation of symbols]

[0028] 1 Pipe rehabilitation tube 2 Departure manhole 3 Reach manhole 4 Fasteners 5 Colors 6 winch 7 Crane lifting wire 8 Tow rope 9 Tow hook 10 Horizontal push jack 11 Hook Pocket 12 scissors 13 Conduit 14 Water injection hose 15 Inverted end 16 tracks 17 Air pocket 18 Vacuum Pump 19 End 20 Hot shower 21 Vacuum hose 22 Insertion pipe 23 Heater 24 Heat Seal Patches 25 Pressure roller 26 Plastic Film 27 Air vent 28 Aquarium h Height of color stand

Claims

1. A method for rehabilitating a pipeline by inserting a pipe rehabilitation tube impregnated with a liquid hardening resin into a pipeline connected by a manhole, attaching the pipe rehabilitation tube to the pipeline wall, and hardening the hardening resin, This pipe rehabilitation method is characterized by the steps of: first inverting the tip of the pipe rehabilitation tube on the ground; then constricting the inverted end with a clamping tool; introducing the inverted end into a manhole; and then pulling or pushing the inverted end at the bottom of the manhole to change its direction toward the pipeline and push it into the pipeline; after the pushing-out, removing the clamping tool; and then inverting and inserting the pipe rehabilitation tube into the pipeline using hydraulic head pressure.

2. 2. The pipe rehabilitation method according to claim 1, wherein the pulling is performed by providing a towing hook at the tip of the fastener and pulling a towing rope attached to the towing hook from the arrival manhole side.

3. 2. The pipe rehabilitation method according to claim 1, wherein the pushing is performed by providing a hook pocket in the fastener and pushing the hook pocket with a lateral push jack.

4. A pipe rehabilitation method as described in claim 1, characterized in that air pockets in the hardening resin that occur as the inversion insertion progresses are vented at the entrance part of the manhole, and the air vent hole is closed after the air is vented.

5. 5. The pipe rehabilitation method according to claim 4, wherein the air vent hole is closed by a heat seal patch.

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