JP7064526B2 - Repair and reinforcement methods for old pipes and repair / reinforcement structures - Google Patents

Description

The present invention relates to a method of repairing and reinforcing an old pipe, and more specifically, a method of repairing and reinforcing an old pipe buried underground to repair / reinforce an old pipe, and a method of repairing and reinforcing an old pipe to which this method is applied. Regarding structures for repair and reinforcement.

According to the prior art (Korean Patent No. 182821), a lining material obtained by impregnating a resin adsorbent with a liquid unsaturated polyester resin is used, and the lining material is inserted into an aged manhole or pipe, and the air pressure is increased. , Water pressure is applied to the lining material, and the inside of the lining material is heated with warm water and steam while the lining material is pressed against the manhole or the wall surface of the pipe to cure the liquid unsaturated polyester resin. As a result, the manhole or the aged pipe was repaired by installing a hardened material on the inner wall.

However, according to the above-mentioned conventional technique, there is a trouble that the lining material must be individually manufactured according to the length and size (inner diameter) of the old pipe to be repaired.

In addition, equipment for moving the lining material to the construction site and reversely inserting the lining material into the inside of the aged pipe, equipment for expanding the lining material, and heating for heating the inside of the lining material with hot water or steam. Since all the equipment must be put into the construction site, there are problems that a lot of equipment is required, the cost increases, the work efficiency decreases, and the work time is long.

In view of these points, conventionally, as shown in FIGS. 1 and 2, a so-called lining-with-spirally-wound method (hereinafter referred to as “spiral method”) has been used. In such a spiral method, a strip material having a joint at an end in the width direction is spirally wound in a manhole and lined in the shape of a pipe (liner pipe), and the ends are lined with each other. By combining the above, a spiral joint pipe having a diameter smaller than that of the old pipe was inserted into the old pipe, and a filler such as cement mortar was filled between the old pipe and the spiral joint pipe. FIG. 1 shows a method of winding a strip material in a spiral shape in a manhole to form a pipe and then allowing the strip material to enter the old pipe, and FIG. 2 shows the strip material in the old pipe. It shows a method of lining by directly winding it in a spiral shape into a pipe shape.

However, such a spiral construction method has a problem that the strength may be insufficient depending on the embedding depth.

Further, as shown in FIGS. 3 to 5, a discontinuous tube lining (lining-with-discrete) in which individual sheath tubes having a certain length are connected and repaired inside the tube to be repaired is connected. pipes) The construction method is used. FIG. 3 shows a method of inserting and installing individual separated pipes into an old pipe by a pushing method in a manhole, and FIG. 4 shows a method of pulling and installing each separated pipe into an old pipe. A method is shown, and FIG. 5 shows a method in which an operator individually connects and installs individual pipes arranged in an old pipe. However, such a conventional method has a problem that the mass of the plastic insertion tube becomes large due to the depth of embedding, which deteriorates workability and increases the cost.

Further, in the case of the above two conventional pipe rehabilitation methods, a high-rigidity cement mortar having a completely different bending elasticity coefficient is injected between the insertion pipe or the spiral winding pipe and the old pipe, so that the spiral is formed. There is a problem that it is difficult to supplement the phenomenon of insufficient strength of the winding tube or the insertion tube. That is, the external force such as the underground water pressure transmitted to the spiral winding pipe or the insertion pipe is not transmitted to the old pipe at all and is blocked by the cement mortar or the like, so that it becomes difficult to increase the strength of the spiral winding pipe or the insertion pipe. Therefore, there is a problem that there is a risk of buckling when underground water pressure or the like acts on the insertion pipe.

Korean Patent Publication No. 2013-0006369

The present invention has been made in view of such problems, and an object thereof is a method of repairing and reinforcing an aged pipe which can improve workability and reduce costs while ensuring strength, and this method. Is to provide a structure for repairing and reinforcing old pipes to which is applied.

The method of repairing and reinforcing an aged tube of the present invention for achieving the above object is a step of pulling the tube into the inside of the aged tube and a step of inserting the insertion tube into the inside of the tube drawn into the inside of the aged tube. It is characterized by including a step of filling a space between the tube and the insertion tube with a liquid resin and curing the liquid resin. The tube here is typically a resin-filled tube that is flexible and has sealing properties against liquids and gases.

As a result, the process time for rehabilitation of old pipes can be shortened and the cost can be reduced.

Here, the insertion tube has an outer diameter smaller than the inner diameter of the old tube by 5% or more (for example, the outer diameter before expansion by pressurization with the liquid s resin is 80 to 95% of the inner diameter of the old tube, 85. It has ~ 95% or 87 ~ 93%) and preferably contains a spiral wound tube formed by winding a strip-shaped strip material around a circular tube.

As a result, the spiral winding tube (spiral winding tube) can be easily entered into the inside of the tube in the old tube to be repaired / reinforced.

Further, it is preferable that an anchor rib is provided on the outer surface of the spiral winding tube. Each anchor rib may have, for example, a shape in which a bar-shaped, disk-shaped, mushroom umbrella-shaped, or other portion is connected to the tip of the columnar portion.

As a result, the curing strength of the liquid resin filled in the space between the spiral winding tube and the tube can be increased, and the bonding force can be improved.

Further, it is preferable that the insertion tube has an outer diameter smaller than the inner diameter of the old tube by 5% or more, and includes a plurality of sheath tubes connected and assembled in the tube.

Thereby, the old pipe can be easily repaired / reinforced by using the sheath pipe.

Further, the sheath tube is a tubular reinforced plastic composite tube formed by mixing glass fiber and sand as an additive with polyester resin, and a plastic composite tube of an adjacent sheath tube extended to one end of the composite tube. It is preferable that a binder for enhancing the bonding force with the resin is installed on the outer surface of the reinforced plastic composite tube, including the socket portion to which the end portion of the reinforced plastic composite tube is inserted and bonded.

Thereby, a plurality of sheath tubes can be easily connected and inserted into the tube to be used for rehabilitation of an aged tube.

Further, the liquid resin is a thermosetting resin selected from unsaturated polyester, vinyl ester and epoxy, and at least one addition selected from calcium carbonate, aluminum hydroxide, sand and talc. It is preferable to include an agent.

As a result, when the old pipe is rehabilitated, the bending elasticity coefficient of the resin between the insertion pipe and the old pipe is adjusted and installed so as to correspond to the insertion pipe, thereby enhancing the effect of strength transmission. can.

Further, the tube was lined (coated; coated) on one surface of the plastic felt (felt made of chemical fibers) formed into a tubular shape by being joined by a joint in the length direction. In the step of pulling in the tube, including the plastic film, it is preferable that the plastic felt is inverted and inserted so as to be in contact with the inner wall of the aged tube. Plastic felt is typically needle punched into a web consisting of polyesters such as PET, polyolefins such as polypropylene, synthetic fiber filaments such as nylon or relatively long strands to resemble wool felt. It is a thing. However, for example, a non-woven fabric produced by the spunbond method from the filament of the synthetic fiber as described above may be used. The plastic felt is typically 0.5 mm to 30 mm thick, for example 2 mm to 20 mm or 3 mm to 15 mm. The plastic film is typically formed of a polyolefin such as polyethylene or polypropylene, or a resin such as vinyl chloride, vinyl acetate, vinylon or polyester to allow some degree of expansion (further stretching) and is thick. The size is, for example, 0.2 mm to 0.8 mm. The insertion tube can also be formed of the same resin, and the plate thickness (wall thickness) of the insertion tube can be 1.0 mm to 10.0 mm, for example, 2 to 8 mm in the case of a spiral winding tube. In the case of a sheath tube, it can be 5.0 mm to 100.0 mm, for example, 10 to 30 mm. It should be noted that the same plastic felt as described above can be formed into a band and attached to the outer peripheral surface of the sheath tube.

As a result, the tube can be easily inverted and inserted into the old tube, and the bonding force between the old tube and the cured resin can be enhanced after installation.

Further, the steps of filling and curing the liquid resin include a step of connecting both ends of the tube with fasteners so as to maintain airtightness with both ends of the insertion tube, and the tube and the insertion tube. It is preferable to include a step of filling and curing the liquid resin while discharging the air in the space between the and.

As a result, the space between the insertion tube and the tube can be easily and effectively filled with the liquid resin and cured.

Further, in the step of filling and curing the liquid resin, the space for filling the liquid resin is divided into upper and lower spaces, an intermediate space and an upper space, and the liquid resin is gradually filled and cured with a time lag. It is preferable to fill the lower space with a liquid resin having a shorter curing time than the liquid resin filled in the middle and upper spaces.

As a result, the space between the tube and the insertion tube can be uniformly filled with the liquid resin and cured, so that uniform strength can be generated over the entire outer peripheral surface of the insertion tube.

Further, it is preferable to further include a step of floating and fixing the insertion tube from the bottom of the old tube before filling the liquid resin.

As a result, by maintaining a constant distance between the insertion tube and the aged tube, the thickness of the cured resin can be ensured to be uniform as a whole, and the reliability of the strength of the rehabilitated tube can be improved.

Further, the fixing step is installed in the length direction of the tube (resin filling tube), and expands and pressurizes a plurality of small supporting tubes installed together when the tube is retracted. The step of ascending the insertion tube from the bottom in the old tube and the inclination of the insertion tube are measured by a laser, and the pressure of the plurality of supporting small tubes is adjusted so that the insertion tube is centered on the old tube. It is preferable to include a step of setting the position.

As a result, the insertion tube can be accurately set and installed in the center of the old tube.

Further, in the filling and curing steps, when the resin filled in the lower space is cured, it is preferable to release the pressure of the plurality of supporting small tubes and then gradually fill the intermediate and upper spaces. ..

As a result, the insertion tube can be filled and cured with the resin fixed so as to be located at the center of the old tube, the space where the resin is not filled can be minimized, and the strength of the rehabilitated tube can be increased. can.

Further, the fixing step is installed so as to extend in the length direction of the tube (resin filling tube), and the small supporting tube is inverted in a plurality of cloth bags installed together when the tube is retracted. The step of inserting, the step of expanding and pressurizing the inverted and inserted small support tube to raise the insertion tube from the bottom of the old tube, and the inclination of the insertion tube are measured by a laser, and the plurality of the insertion tubes are measured. It is preferable to include a step of adjusting the pressure in the small supporting tube to set the insertion tube so that it is located at the center of the old tube.

As a result, the positions of the pre-inserted tube (resin filling tube) and the insertion tube can be easily set so as to be located at the center of the old tube.

Further, the old pipe repair / reinforcement structure of the present invention for achieving the above object includes a tubular tube (resin filling tube) that is in close contact with the inner wall of the old pipe and an insertion pipe installed inside the tube. , The space between the tube and the insertion tube is filled with and cured resin.

As a result, the resin can be easily filled and cured between the insertion tube and the old tube, and the resin having a good strength transmission effect is filled between the old tube and the insertion tube, so that the pressure from the outside is applied. There is an advantage that buckling due to can be prevented.

Further, the tube preferably contains a tubular plastic felt in contact with the aged tube and a plastic film coated on the inner surface of the plastic felt.

Further, the insertion tube includes a spiral winding tube formed by spirally winding a strip-shaped strip material to form a tubular shape, and an anchor rib bonded to the cured resin is provided on the outside of the spiral winding tube. It is preferable to be connected.

As a result, the bonding force between the spiral winding tube and the cured resin can be enhanced.

Further, the insertion tube includes a plurality of sheath tubes connected in series by a socket portion extended from one end, and a resin adsorbent or a resin binder is installed between the cured resin and the sheath tube. It is preferable to be done.

According to the old pipe repair and reinforcement structure of the present invention, the pipe rehabilitation structure having a structure in which the tube, the curable resin and the insertion pipe are bonded from the outside is installed inside the old pipe so as to be integrated. Can be rehabilitated.

Further, as the insertion tube, a spiral wound tube or a sheath tube can be selectively used. At this time, since the bending elastic modulus of the insertion tube and the curable resin can be similarly applied, buckling due to an external force can be used. The phenomenon can be prevented and the reliability of the rehabilitated pipe can be increased.

Further, since the insertion tube can be fixedly installed in a state of being easily set in the center of the old tube, the old tube can be rehabilitated so as to have uniform strength in all directions.

In addition, since the curable resin can be filled to a predetermined thickness to repair the aged pipe and form a reinforcing structure, a relatively lightweight insertion pipe can be used, whereby a heavy insertion pipe can be used. It is possible to improve the convenience of construction, shorten the construction time, and reduce the cost as compared with the conventional technique using.

It is a figure (1) for explaining the conventional spiral construction method. It is a figure (2) for explaining the conventional spiral construction method. It is a figure (1) for demonstrating the conventional discontinuous pipe lining (lining-with-discrete pipes) construction method. It is a figure (2) for demonstrating the conventional discontinuous pipe lining (lining-with-discrete pipes) construction method. It is a figure (3) for demonstrating the conventional discontinuous pipe lining (lining-with-discrete pipes) construction method. It is a figure for demonstrating the state which pulls a tube into the inside of an old tube. It is a perspective view which shows the tube. It is a figure for demonstrating the process of pulling a spiral winding tube into the inside of a tube in an old tube. It is a figure for demonstrating the process of injecting a liquid resin between a tube installed inside an old tube and a spiral winding tube. It is sectional drawing for demonstrating the pipe support structure installed inside the old pipe. It is a figure for demonstrating the process of reversing and inserting a tube into an old tube by pressure. It is a figure for demonstrating the process of pulling a sheath tube into the inside of a tube in an old tube. It is sectional drawing which shows the sheath tube of FIG. It is a figure for demonstrating the process of filling a space between a tube installed inside an old tube and a sheath tube with a liquid resin. FIG. 12 is a cross-sectional view showing a state in which a sheath tube is installed inside the tube as shown in FIG. FIG. 5 is a cross-sectional view taken along the line I-I of FIG. FIG. 14 is a cross-sectional view showing a state in which resin is filled between the inside of the tube and the sheath tube in the state of FIG. FIG. 6 is a cross-sectional view taken along the line II-II of FIG. It is a schematic cross-sectional view which shows the non-circular sheath tube.

Hereinafter, the old pipe repair and reinforcement method according to the embodiment of the present invention and the old pipe repair and reinforcement structure to which this method is applied will be described in detail with reference to the accompanying drawings.

The old pipe repair and reinforcement method according to the embodiment of the present invention and the old pipe repair and reinforcement structure to which this method is applied will be described in detail.

First, as shown in FIG. 10, in the old pipe repair / reinforcement structure 50 according to the embodiment of the present invention, the tube 100, the curable resin 410, and the insertion are made in order from the side in contact with the inner wall of the existing old pipe 10. It has a configuration in which a spiral winding tube 200 as a tube is combined. Preferably, the anchor rib 211 is installed on the outside of the spiral winding tube 200, and has a structure in which the rib 211 is embedded in the curable resin 410 and bonded to the outside. The structure 50 for repairing and reinforcing old pipes having the above structure (hereinafter referred to as “repair / reinforcing structure”) is installed on the inner wall of the old pipe 10 by the method for repairing and reinforcing old pipes of the present invention. The old pipe 10 can be rehabilitated.

Hereinafter, a method of installing the repair / reinforcement structure 50 inside the aged pipe 10 to repair / reinforce it will be described.

First, as shown in FIG. 6, a tube 100 having an outer diameter dimension substantially the same as the inner diameter of the aged pipe 10 is inserted into the aged pipe 10 through a manhole 20. The tube 100 can be entered into the aged pipe 10 by using the tow rope 30. As shown in FIG. 7, the tube 100 may be made of a material in which a plastic felt 110 is coated with a plastic film 120. Such a tube 100 is formed into a tube shape having a predetermined length by joining the connecting member 130 to the outside of the joint portion 111 to which both edges of the strip-shaped sheet are joined so as to extend in the length direction of the tube 100. Can be manufactured. That is, the tube 100 is a material obtained by coating (coating) a plastic film 120 such as polyethylene on one surface of a plastic felt 110 such as polyester felt having a thickness of about 0.5 mm to 30.0 mm, as shown in FIG. This is an airtight tube that has been processed into a tubular shape so that the outer surface is a plastic film and the inner surface is a plastic felt before inversion (turning over).

Further, on the inner peripheral surface of the tube 100, that is, on the inner peripheral surface of the plastic felt 110, a plurality (2 to 30) of cloth bags 140 or supporting tubes 150 may be installed over the entire length in the length direction of the tube 100. preferable. The cloth bag 140 or the supporting tube 150 has a diameter of 300 mm or less, and is preferably arranged and fixed at regular intervals in the circumferential direction on the inner peripheral surface of the tube 100.

When the tube 100 having the above structure is inserted into the old pipe 10, the plastic felt 110 is exposed to the outside and inserted by turning it over (inverted) so as to face the inner wall of the old pipe 10. As a method of reversing and inserting the tube 100 into the old tube 10, there are a method of pulling after reversing and a method of inserting while reversing. After the tube 100 is inverted and inserted into the old tube 10, the spiral wound tube 200 is inserted into the tube 100 as shown in FIG.

Here, the spiral wound tube 200 is manufactured so as to have an outer diameter that is at least 5% smaller than the inner diameter of the old tube 10, and is preferably installed inside the tube 100. That is, for the spiral winding tube 200, the strip material (strip-shaped material) 210 is manufactured in the manhole 20 at the site into the spiral winding tube 200 having a circular cross section by using the spiral winding / tube making device 300, and then the tube is formed. Insert into 100. The strip material 210 may be made of vinyl chloride, polyethylene, or the like, and has an anchor rib 211 protruding outward. Such a strip material 210 is a strip-shaped body having a width of 50 mm to 500 mm, a plate thickness of 1.0 mm to 10.0 mm, and a height of the anchor rib 211 of 5.0 mm to 50.0 mm. , At least 50m to 2000m is wound on a support roller (not shown) and moved to the site.

Here, the spiral winding / pipe making device 300 is a coupling machine 310 that pulls and supplies the strip material 210 wound around the support roller when one end of the strip material 210 is connected and inserted. And a cage 320 for forming the strip material 210 that has passed through the coupling machine 310 into a tube having a desired outer diameter and then moving the strip material 210 into the tube 100. Since a known technique widely used in the technical field can be applied to such a spiral winding / tube making device 300, further detailed description thereof will be omitted.

As a result, the spiral winding tube 200 is manufactured, and is extruded and inserted into the tube 100 while rotating. A tubular tube fixing nozzle 220 is installed at the entrance of the old tube 10 so that the spiral winding tube 200 can be smoothly inserted into the tube 100, and the tube 100 is fixed to the outside of the tube fixing nozzle 220. do. By supplying the spiral winding tube 200 so as to pass through the tube fixing nozzle 220, the spiral winding tube 200 can be easily inserted into the tube 100 to which one end is fixed. Further, by filling the tube 100 with water, the spiral winding tube 200 can be suspended to facilitate rotation and forward movement, and the plastic film on the inner surface of the tube 100 is lubricated with oil or the like. The agent can be applied. Further, a guide tube (not shown) may be installed at the tip of the spiral winding tube 200, and the tube 100 may be connected while being pushed to the opposite side and expanded.

Further, the spiral winding tube 200 may be inserted in a state of a small diameter, and the diameter may be expanded after the insertion.

As described above, when the work of inserting the spiral winding tube 200 into the inside of the tube 100 is completed, as shown in FIG. 9, in the space G between the inner surface of the tube 100 and the outer surface of the spiral winding tube 200, Fill with liquid resin 410. That is, as shown in FIG. 9, both ends of the tube 100 are fixed to the outer periphery of the spiral winding tube 300 by using a fastener 420 so as to maintain airtightness. Then, the liquid resin in the resin tank 430 is supplied to the space G between the tube 100 and the spiral winding tube 200 through the resin supply hose 440 while being stirred by the stirrer 431 to fill the space G. The filling amount of the liquid resin can be adjusted by operating the valve 441 installed in the resin supply hose 440. While the liquid resin is filled as described above, the air in the space G can be discharged to the outside through the air discharge pipe 450 connected to the tube 100. Therefore, the liquid resin 410 can be effectively filled by pouring it by its own weight.

Here, the liquid resin has a structure in which a thermosetting resin and an additive are mixed, and as the thermosetting resin, unsaturated polyester, vinyl ether resin, epoxy resin and the like can be applied. As the additive, calcium carbonate, aluminum hydroxide, fine sand, talc and the like can be mixed with the thermosetting resin. Further, although it varies depending on the site, a wet-curable unsaturated polyester that cures well even in a wet state can be used as a thermosetting resin in a site that is easily affected by water. A catalyst or a curing agent is added to such a liquid thermosetting resin in the field, and the curing time at room temperature can be adjusted as desired between 10 minutes and 3000 minutes. The bending elasticity coefficient (based on ISO178) of the cured resin is preferably 100 MPa to 10,000 MPa.

On the other hand, the liquid resin can be injected into the space G without fixing the tube 100 and the spiral winding tube 200. In this case, since the spiral winding tube 200 floats due to the buoyancy of the liquid resin, it is preferable to put water inside the spiral winding tube 200.

Further, when the liquid resin is filled, the space under the spiral winding tube 300 is cured by using the liquid resin having an initial curing time of about 30 minutes and a short curing time. Then, after the intermediate portion is filled with the liquid resin and cured, the upper space can be filled with the liquid resin and cured step by step.

Further, in another filling method, air is supplied to the small supporting tube 150 attached to the tube 100 to inflate it, or the tube is turned over (inverted) from the state of FIG. 7 in the cloth bag 140. By injecting air in the state of being inserted from the pipe and expanding and pressurizing the spiral winding pipe 300, the spiral winding pipe 300 can be fixed in a state of floating from the bottom surface of the old pipe 10 so as to maintain a constant distance from the old pipe 10. .. At this time, the inclination is measured by a laser inside the spiral winding tube 200, and the internal pressure in the plurality of small supporting tubes 150 is adjusted so that the spiral winding tube 200 is arranged at the center of the old tube 10. Then, it can be set in the center of the old pipe 10.

When the spiral winding tube 200 is arranged in the center of the old tube 10, the space along the bottom surface of the spiral winding tube 200 is temporarily filled with the liquid resin, and the curing time of the resin at this time is 10 minutes or more. It is good to set it to about 200 minutes. When the resin filled in the space along the bottom surface of the spiral winding tube 200 is cured, the pressure in the small supporting tube 150 is released, and the resin is filled in order. As described above, when the operation of filling and curing the liquid resin between the spiral winding tube 200 and the tube 100 is performed stepwise and completed, the rehabilitation of the old tube 10 is completed. FIG. 10 is a cross-sectional view showing a state in which the rehabilitation of an aged tube is completed by filling a resin between the tube 100 and the spiral wound tube 200 and hardening the resin. At this time, the anchor ribs 211 formed so as to protrude from the outer periphery of the spiral winding tube 200 are cured in a state of being embedded in the resin inside the cured resin, and serve as an anchor. Therefore, the bonding force between the spiral winding tube 200 and the cured liquid resin can be enhanced.

Further, referring to FIGS. 17 and 18, the tube rehabilitation structure 50'according to another embodiment of the present invention is arranged in order from the side of the inner wall of the aged tube 10, the tube 100, the curable resin 410, and the bond. A material 530 and a sheath tube 500 as an insertion tube are provided. Here, the binder 530 may contain a resin adsorbent or a resin binder.

A method of installing the pipe rehabilitation structure 50'having the above structure inside the old pipe 10 to rehabilitate the old pipe 10 will be described.

First, as shown in FIG. 11, the tube 100 is inserted inside the aged tube 10 while being turned inside out (inverted). That is, one end of the tube 100 is folded back and one end thereof is attached to and fixed to the reversing nozzle 510, and water is injected through the water injection port of the reversing nozzle 510 to invert the tube 100 into the inside of the aged pipe 10 (reversing). It can be inserted while making it.

Alternatively, by storing the entire tube 100 in a closed container and applying air pressure in the closed container, the tube 100 can be inverted and inserted into the inside of the aged tube 10 by the air pressure.

Further, as described above with reference to FIG. 6, it is also possible to invert the tube 100 once and then pull the tube 100 into the inside of the aged tube 10 with the plastic film located on the inner surface.

After the tube 100 is pulled into the old tube 10, the sheath tube 500 is sequentially connected and inserted into the tube 100 as shown in FIG. Referring to FIG. 13, the sheath tube 500 is provided at the end of the tubular reinforced plastic composite tube 510 and the composite tube 510, and is for packing connection to be bonded to the end of the composite tube 510 of the other sheath tube 500. It has a socket portion 520. The composite tube 510 is preferably made of a reinforced plastic material composed of additives such as polyester resin, glass fiber and sand. One sheath tube 500 has a length of 500 mm to 6000 mm, and the plate thickness varies depending on the diameter of the tube, but is preferably 5.0 mm to 100.0 mm. Further, a binder 540 is installed on the outer surface of the composite pipe 510 to a predetermined thickness. The binder 540 contains a resin adsorbent or a resin binder. In the case of a resin adsorbent, a polyester or polypropylene felt having a thickness of 0.5 mm to 50.0 mm can be formed into a band and fixed to the outer surface of the composite tube 510 with a take-up tape type adhesive. .. Such sheath tubes 500 can also include products that have been split once and then combined and joined, and can also include tubes with a circular or non-circular cross section.

The sheath pipe 500 having such a configuration is supplied one by one from the ground through the manhole 20 to the entrance of the old pipe 10 to the pipe opening, and then taken into the inside of the tube 100 installed in the old pipe 10 one by one. However, by pressurizing with a jack or by pulling from the pipe opening at the other end using a traction device such as a winch, the plurality of sheath pipes 500 can be pulled in while being coupled. That is, as shown in FIG. 12, a square lumber 610 is installed at the end of the sheath pipe 500 in the radial direction, and a tow rope 620 connected to the square lumber 610 is towed from the opposite side by a winch or the like. The sheath tube 500 can be drawn into the tube 100 in the old tube 10 in a bonded state.

Of course, the sheath pipes 500 can be inserted into the old pipes 10 one by one and connected in the pipes. For the connection between the sheath tubes 500, a packing 530 is installed in the socket portion 520, and the end portion of the composite tube 510 of the adjacent sheath tube 500 is pushed into the socket portion 520 in which the packing 530 is installed to ensure airtightness. It can be done in this way.

Prior to inserting the sheath tube 500 into the tube 100, as described with reference to FIG. 8, the work is performed in a state where one end of the tube 100 is connected to and fixed to the tube fixing nozzle 220.

When the insertion work of the sheath tube 500 is completed, as shown in FIG. 14, the tube 100 is connected to both ends of the connecting body by the series of sheath tube 500 so as to maintain airtightness with the fastener 420. After that, the space G between the sheath tube 500 and the tube 100 is filled with the liquid resin 410. Since the liquid resin 410 and the filling method thereof have been described with reference to FIG. 9, detailed description of the overlapping contents will be omitted.

On the other hand, as shown in FIGS. 15 and 16, a space G is formed between the tube 100 installed inside the old tube 10 and the sheath tube 500 arranged inside the tube 100. In this state, the tube 100 is invertedly inserted into the old pipe 10 and arranged so that the plastic felt 110 is in contact with the old pipe 10, so that the cloth bag 140 or the small tube for fixing is fixed and installed on the plastic felt 110. The 150 is arranged between the old tube 10 and the tube 100. Therefore, the sheath tube 500 is arranged so as to be located at the center of the aged tube 10 by reversely inserting the tube into such a cloth bag 140 and pressurizing it, or by pressurizing and expanding the small supporting tube 150. Can be done. In this state, the space G is filled with a liquid resin stepwise with a time difference and gradually cured. Then, as shown in FIGS. 17 and 18, the tube 100 is in close contact with the inner wall of the aged tube 10, and the curable resin 410 is filled between the sheath tube 500 and the tube 100 to be cured. The bonding material provided on the outer periphery of the sheath tube 500 can firmly maintain the bonded state between the curable resin 410 and the sheath tube 500. By such a method, the rehabilitation process of the aged pipe 10 can be completed.

Of course, when filling the space G with the resin, the pressure of the small tube inserted into the cloth bag 140 and expanding, or the pressure of the small supporting tube 150 is slowly released to fill the resin. If so, the space G can be sufficiently filled with the resin and cured so that no space remains between the aged tube 10 and the tube 100.

Also, as shown in FIG. 19, a non-circular sheath tube 500'may be used. Such a non-circular sheath tube 500'has a first and second split tube portions 501 and 50 that are split from each other.
2 has a structure of being joined by a joint portion 505 on the outer periphery and the inner circumference, and has a structure in which an adhesive 530 is installed on the outer surface.

As explained above, according to the pipe support structure and the pipe rehabilitation method, the tube and the insertion pipe are installed inside the old pipe, but the rigidity and strength transmission of the insertion pipe are good in the space between them. By injecting and curing a resin as a filler that can be used, the bending elasticity coefficient of the insertion tube and the bending elasticity coefficient of the filling resin can be easily adjusted to the same extent and rehabilitated.

In particular, the effect of strength transmission can be enhanced by binding the anchor rib of the insertion tube, the resin adsorbent, or the like to the filling resin.

In this way, the strength transmission becomes good, the strength shortage can be sufficiently compensated, and the strength shortage using the spiral winding tube can be solved.

Further, in the rehabilitation method using a sheath tube, not only the lack of strength can be solved, but also a sheath tube having a thin thickness can be used, so that not only the workability can be improved but also the cost reduction effect can be obtained.

In addition, the tube separates the aged tube from the filling resin to avoid contact with moisture, contaminants, and the like, so that the filling resin can be cured in a favorable environment.

Further, since the insertion tube can be easily set at the center of the old tube by using the small support tube, more stable strength can be secured.

Although the present invention has been illustrated and described above in connection with a preferred embodiment for exemplifying the principles of the invention, the invention is limited to the configurations and actions as such illustrated and described. It's not a thing. Those skilled in the art will appreciate that various modifications and amendments may be made to the invention without departing from the ideas and scope of the appended claims.

10 Aged pipe 20 Manhole 30 Tow rope 50, 50'Repair and reinforcement structure 100 Tube 110 Plastic felt 120 Plastic film 200 Spiral winding pipe 211 Anchor rib 300 Winding device 500, 500'Sheath pipe 510 Reinforced plastic composite pipe 520 Socket Part 540 Bonding material

Claims (17)

The step of pulling the tube inside the old pipe,
The step of inserting the insertion tube into the inside of the tube drawn into the inside of the old tube, and
A method for repairing and reinforcing an aged tube, which comprises a step of filling and curing a thermosetting resin and a liquid resin containing a catalyst or a curing agent in a space between the tube and the insertion tube. The insertion tube has an outer diameter that is 5% or more smaller than the inner diameter of the old tube, and is formed by spirally winding a strip-shaped strip material so as to form a tube having a circular cross section. The method for repairing and reinforcing an aged pipe according to claim 1, wherein the pipe is included. The method for repairing and reinforcing an aged pipe according to claim 2, wherein an anchor rib is projected on the outer surface of the spiral wound pipe. The insertion tube has an outer diameter that is 5% or more smaller than the inner diameter of the old tube, and includes a plurality of sheath tubes that are connected to each other and assembled in the tube, according to claim 1. The method of repairing and reinforcing the old pipe described. The sheath tube is
A tubular reinforced plastic composite tube formed by mixing glass fiber and sand as additives in polyester resin, and
Includes a socket portion that is extended to one end of the composite tube and the end of the plastic composite tube of the adjacent sheath tube is inserted and coupled.
The method for repairing and reinforcing an aged pipe according to claim 4, wherein a binder for enhancing the bonding force with the resin is installed on the outer surface of the reinforced plastic composite pipe. The liquid resin is
With any thermosetting resin selected from unsaturated polyesters, vinyl esters and epoxies,
The method for repairing and reinforcing an aged pipe according to claim 1, which comprises at least one additive selected from calcium carbonate, aluminum hydroxide, sand and talc. The tube is
Includes a plastic felt extending lengthwise and joined by a joint to form a tubular, and a plastic film coated on one side of the plastic felt.
The method for repairing and reinforcing an aged tube according to claim 1, wherein in the step of pulling in the tube, the plastic felt is inverted and inserted so as to be in contact with the inner wall of the aged tube. The step of filling and curing the liquid resin is
A step of connecting both ends of the tube to both ends of the insertion tube using fasteners so as to maintain airtightness.
The aged tube according to any one of claims 1 to 7, further comprising a step of filling and curing the liquid resin while discharging air in the space between the tube and the insertion tube. Repair and reinforcement methods. The step of filling and curing the liquid resin is
The space for filling the liquid resin is divided into a lower space, an intermediate space, and an upper space above and below, and the liquid resin is gradually filled and cured with a time difference.
The method for repairing and reinforcing an aged pipe according to claim 8, wherein the lower space is filled with a liquid resin having a shorter curing time than the liquid resin filled in the middle and upper spaces. The method for repairing and reinforcing an old pipe according to claim 8, further comprising a step of floating and fixing the insertion pipe from the bottom of the old pipe before filling with the liquid resin. The fixing step is
A plurality of small supporting tubes installed so as to extend along the length direction of the tube and pulled together when the tube is retracted are expanded and pressurized, and the insertion tube is inserted into the bottom portion of the old tube. Steps to emerge from
It comprises a step of measuring the inclination of the insertion tube with a laser and adjusting the pressure of the plurality of supporting small tubes to set the insertion tube so as to be located at the center of the old tube. , The method for repairing and reinforcing an aged pipe according to claim 10. In the filling and curing step, the space for filling the liquid resin is divided into a lower space, an intermediate space, and an upper space, and if the resin filled in the lower space is cured, the plurality of supporting spaces are used. The method of repairing and reinforcing an aged pipe according to claim 11 , wherein the intermediate and upper spaces are gradually filled after the pressure of the small tube is released. The fixing step is
A step of reversing and inserting a small support tube into a plurality of cloth bags installed in the length direction of the tube and pulled together when the tube is pulled in.
A step of inflating and pressurizing the inverted and inserted supporting small tube to raise the insertion tube from the bottom of the aged tube.
It comprises a step of measuring the inclination of the insertion tube with a laser and adjusting the pressure of the plurality of supporting small tubes to set the insertion tube so as to be located at the center of the old tube. , The method for repairing and reinforcing an aged pipe according to claim 10. The method for repairing and reinforcing an aged pipe according to any one of claims 1 to 13, wherein the curing is performed at room temperature. A tubular tube that adheres to the inner wall of the old tube,
The insertion tube installed inside the tube and
Contains a resin that has been filled and cured in the space between the tube and the insertion tube.
The tube is a aging pipe repair / reinforcing structure comprising a tubular plastic felt in contact with the aging pipe and a plastic film coated on the inner surface of the plastic felt. The insertion tube includes a spiral winding tube formed by spirally winding a strip-shaped strip material into a tubular shape.
The old pipe repair / reinforcement structure according to claim 15 , wherein an anchor rib bonded to the cured resin is connected to the outside of the spiral wound pipe. The insertion tube comprises a plurality of sheath tubes connected in series by a socket portion extended from one end.
The old pipe repair / reinforcement structure according to claim 15 , wherein a resin adsorbent or a resin binder is installed between the cured resin and the sheath pipe.

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