WO1994027808A1 - Tuyau de reparation, procede de reparation d'un conduit au moyen dudit tuyau de reparation, et procede de retrait du tuyau de reparation - Google Patents
Tuyau de reparation, procede de reparation d'un conduit au moyen dudit tuyau de reparation, et procede de retrait du tuyau de reparation Download PDFInfo
- Publication number
- WO1994027808A1 WO1994027808A1 PCT/JP1994/000704 JP9400704W WO9427808A1 WO 1994027808 A1 WO1994027808 A1 WO 1994027808A1 JP 9400704 W JP9400704 W JP 9400704W WO 9427808 A1 WO9427808 A1 WO 9427808A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- repair
- tube
- pipeline
- resin
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/26—Lining or sheathing of internal surfaces
- B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
- B29C63/343—Lining or sheathing of internal surfaces using tubular layers or sheathings the tubular sheathing having a deformed non-circular cross-section prior to introduction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/0004—Component parts, details or accessories; Auxiliary operations
- B29C63/0013—Removing old coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/26—Lining or sheathing of internal surfaces
- B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
- F16L55/1652—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section
- F16L55/1654—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section and being inflated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
- F16L55/1656—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section materials for flexible liners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/0809—Fabrics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/0809—Fabrics
- B29K2105/0845—Woven fabrics
Definitions
- the present invention refers to pipes such as gas pipes and water and sewage pipes, and pipes that are mainly buried in the ground, and repair pipes used to repair the pipes in the pipes. It provides the body, and more specifically, it is a repair tube made of a hard tube made of thermoplastic resin and a tubular woven cloth, and its repair tube ⁇ It is related to the method of repairing or reinforcing the pipeline using the repair pipe, and further, the installed repair pipe is deteriorated or the pipe is pushed for some reason. When the pipeline is re-lined when it is crushed and its function as a pipeline is impaired, the crushed repair pipe is removed from the pipeline. It is about the method.
- a rigid thermoplastic resin pipe such as a rigid polyester or a rigid polyvinyl chloride is inserted into the pipeline.
- Japanese Patent Application Laid-Open No. 58-88281 states that the synthetic resin pipe is folded flat, and the flat synthetic resin pipe is further folded in two to reduce the cross-sectional shape of the pipeline. After passing through the inside, steam is sent into the synthetic resin pipe to heat and pressurize. It describes how to run along the inner surface of the pipeline.
- Japanese Patent Application Laid-Open No. 64-64827 states that a synthetic resin pipe that has been heated and is in a softened state is held by a long holding member, and this holding member is piped. It describes a method of inserting the synthetic resin pipe into the pipeline along with it when it is pulled into the route.
- a plastic seal with a strong fiber is used as the holding member, and fasteners are provided on both sides of the plastic seal to close the cylinder. It has become possible to be in a state.
- the plastic sheet containing the reinforcing fiber equipped with this fastener wraps the synthetic resin pipe, and the plastic sheet wrapped with the synthetic resin pipe is pulled into the conduit.
- the synthetic resin pipe held by this plastic is pulled into the pipeline.
- the fastener is opened, the plastic sheet is collected outside the pipeline, and the inside of the synthetic resin pipe is pressurized so that it runs along the inner surface of the pipeline.
- Japanese Patent Application Laid-Open No. 2-202431 states that the tubular body used in the method of forming this type of pipeline inner tube has tensile strength along the peripheral wall of the synthetic resin pipe.
- the method of using the buried tonicity strip is described.
- a narrow strip made of woven cloth is used, and about 4 to 10 strips are arranged at equal intervals on the outer surface of the peripheral wall of the synthetic resin pipe to make a synthetic resin pie. Care is taken to prevent the synthetic resin pipe, which is in a softened state due to heating, from being excessively stretched when the pipe is pulled into the pipeline.
- the synthetic resin pipe is heated by feeding the heating fluid into the synthetic resin pipe. It is difficult to heat the pie uniformly over the entire length of the pie, partial heating causes unevenness, and part of the synthetic resin pie is overheated. There is a problem that it becomes too soft, or it is not heated enough in other parts, and some parts are not sufficiently softened. When internal pressure is applied to the tube body in such a state, unevenness is generated in the way of expansion depending on the degree of partial softening, and the strongly softened part partially expands and becomes thick. There is a problem that the cracks are generated.
- Japanese Patent Application Laid-Open No. 64-5 6 5 3 1 states that a part of a cylindrical resin pipe is pushed inward to omit a cross section. Although the method of making it concave is described, even with this method, the resin pipe has a habit of having a substantially concave cross section, and it tries to return to the shape by external pressure.
- the resin pipe is a rigid pipe by itself, and it is not easy to insert it into the pipe even if the cross section is reduced.
- Rigid resin pipes are difficult to bend and bend, even though it is necessary to insert along the bend, especially if the conduit has a bend. Forcibly pulling the resin pipe into the pipeline may damage or crack the resin pipe. There is also a fear of doing it.
- the tip of the resin pipe must follow the bends and steps in the pipeline and change its direction, but if the tip is hard, It is not easy to change direction, and it is difficult to insert it because it is caught in a bend or step.
- the present invention has been made to overcome the drawbacks of the prior art, and expands even if partial heating unevenness occurs when the heating and pressurizing fluid is fed.
- the first is to provide a repair tube that expands evenly over the entire length and can properly adhere to the inner surface of the pipeline, without causing any variation in the method. It is the purpose.
- the present invention can easily bend the repair pipe body so that the cross section becomes approximately V-shaped to U-shaped without expanding when heated, and its shape.
- the second purpose is to provide a means that can be easily inserted into the pipeline while holding the above.
- the present invention provides a method for easily pulling out a repair pipe lined in a pipeline from the pipeline with a small force. It is the third purpose.
- the pipe body used in the method of repairing the pipe line by passing through the pipe line
- the pipe body is made of a thermoplastic resin and is a hard pipe and a tubular woven cloth.
- the tubular woven fabric is placed on the inner or outer surface of the hard tube, or is placed in the thermoplastic resin layer of the hard tube and integrally molded. Repair pipes featuring The body is provided.
- the warp yarn shows a large elongation with a small load, and when it is extended by a predetermined amount, it does not extend any more and supports a large load.
- a tubular woven fabric made of threads, which has the property of being able to be formed, is suitable.
- the warp yarn is a crimped synthetic yarn, or the synthetic fiber yarn is spiraled around an elastic yarn having elasticity. Covering yarn wound in a shape is particularly suitable.
- a desired repair tube is an inner layer resin layer made of a thermoplastic resin having a softening point higher than the temperature of the heated and pressurized fluid sent into the tube, and the inner layer.
- a hard tube made of an outer layer resin layer made of a synthetic resin having a lower shaving point than a thermoplastic resin of the resin layer, and a hard tube formed of the inner layer resin layer of the hard tube are attached and integrated. It is also a tubular woven fabric.
- the resin material for each of these layers high-density polyethylene is used as the thermoplastic resin that forms the inner layer resin layer, and the thermoplastic resin that forms the outer layer resin layer is linear. It is preferable to use low density plastic.
- a hard tube made of a thermoplastic resin formed into a cylindrical shape by extrusion molding and a repair tube made of a tubular woven cloth are used. Fold it flat at a temperature near the softening point of the plastic resin of the constituent thermoplastic resin, and then fold the folded repair tube body sufficiently from the softening point of the plastic resin. Adds to a low and deformable temperature The cross section is approximately v-shaped to the state where it is warmed and kept flat.
- a method of repairing a pipeline which is characterized by inflating, is provided.
- the repair tube formed into a cylindrical shape is folded flat, and both ends of the tube are airtightly closed, and the tube is approximately V-shaped to U-shaped until it is flat. It is a method of bending the pipe so that it is inserted into the pipe, and then a heated and pressurized stream is sent into the pipe to inflate it and run along the inner surface of the pipe. NS.
- the repair tube molded into a cylindrical shape is folded flat, the inside of the tube is depressurized from the end of the tube, and the cross section is approximately V while maintaining the flat shape. It is curved so that it becomes a U-shape or a U-shape, the curved pipe is inserted into the pipe, and then a heating and pressurizing fluid is sent into the pipe to inflate it, and the inside surface of the pipe is inflated. It's a way to get along.
- Another method is to fold the repair tube, which is molded into a cylindrical shape, flat, and then bend the tube so that the cross section is approximately V-shaped or U-shaped until it is flat. Squeeze, position the tip of the hose at the tip of the curved tube, and while feeding the heating fluid from the hose into the repair tube or between the repair tube and the conduit, Insert the repair tube into the conduit, and then This is a method in which a heated and pressurized fluid is sent into the pipe to swell and follow the inner surface of the pipe.
- both ends of the repair pipe lined in the pipe line are airtightly sealed, and the inside of the pipe body is decompressed so that the pipe body is placed on the inner surface of the pipe line.
- a method of removing the repair pipe lined in the pipeline which is characterized by peeling off, shrinking and deforming the cross-sectional shape, and then pulling out the repair pipe from the rear pipeline. Is provided.
- the method described below is a more preferable mode.
- FIG. 1 is a cross-sectional view of a pipe line showing a state in which the repair pipe body 1 of the present invention is passed through the pipe line 2.
- FIG. 2 is a cross-sectional view of an embodiment of the repair pipe body 1 of the present invention.
- Fig. 3 schematically shows a part of the pipe wall of the repair pipe body 1 in Fig. 2. It is a vertical cross-sectional view which shows.
- FIG. 4 is a side view schematically showing an example of a warp thread used for the tubular woven fabric 4 in the repair tube 1 of the present invention.
- FIG. 5 is a cross-sectional view of another embodiment of the repair tube 1 of the present invention.
- FIG. 6 is a cross-sectional view of another embodiment of the repair tube 1 of the present invention.
- FIG. 7 is a cross-sectional view of another embodiment of the repair tube 1 of the present invention.
- FIG. 8 is a diagram showing an example of a state in which the repair tube 1 according to the present invention is molded.
- FIG. 9 is a cross-sectional view showing a state in which the repair pipe 1 is folded flat.
- FIG. 10 is a vertical cross-sectional view showing an example of a state in which the repair pipe 1 in the present invention is curved and pulled into the pipe 2.
- FIG. 11 is a vertical cross-sectional view of the end showing an example in which the end of the repair pipe 1 in the present invention is in a closed state.
- FIG. 12 is a cross-sectional view of the heating device 18 shown in FIG.
- FIG. 13 is a vertical cross-sectional view showing an embodiment in which the repair pipe body 1 of the present invention is pulled into the pipe line 2.
- FIG. 14 is a vertical cross-sectional view showing another embodiment in which the repair pipe body 1 of the present invention is pulled into the pipe line 2.
- FIG. 15 the repair pipe 1 in the present invention is pulled into the pipe 2. It is a vertical cross-sectional view which shows the other example of the state which is in the state of being squeezed.
- FIG. 16 (a) is a cross-sectional view of the pipe line 2 showing the state in which the repair pipe body 1 is arranged on the inner surface of the pipe line 2.
- Fig. 16 (b) is a cross-sectional view showing a state in which one end of the repair pipe 1 is sealed and suction is applied from the other end to reduce the pressure inside the pipe 1 o.
- FIG. 16 (c) is a cross-sectional view showing that the inside of the repair pipe 1 is decompressed and the pipe 1 is in a crushed state.
- FIG. 17 is a central vertical cross-sectional view of the pipe line 2 in a state where the repair pipe body 1 is arranged on the inner surface of the pipe line 2.
- FIG. 18 (a) is a cross-sectional view showing a state in which the repair pipe 1 arranged in the pipe 2 is filled with pressurized steam.
- FIG. 18 (b) is a cross-sectional view showing a state in which both ends of the repair pipe 1 are sealed by being filled with pressurized steam.
- FIG. 18 (c) is a cross-sectional view showing a state in which the pressurized steam in the repair pipe 1 is condensed and the pipe 1 is reduced and deformed.
- FIG. 19 is a central vertical cross-sectional view of the pipe line 2 in a state where the repair pipe body 1 of the present invention is inserted into the bent portion in the pipe line 2.
- FIG. 20 is a cross-sectional view of the synthetic resin pipe body 100 in the prior art.
- FIG. 21 is a cross-sectional view showing a state in which the pipe inside the pipeline formed by the prior art is crushed in a substantially concave shape due to external pressure.
- Figure 1 shows the repair pipe 1 of the present invention inserted into the pipe 2. Although the condition is shown, the repair pipe 1 is in a state where it is folded flat and its cross section is bent in a substantially U shape.
- the hard pipe made of thermoplastic resin is heated and softened, and then expanded to expand the inner surface of the pipe 2.
- the inner surface of pipeline 2 is repaired by making it adhere to the pipe.
- Fig. 2 shows an example of the repair pipe 1 of the present invention, in which a tubular woven cloth 4 is arranged within the wall thickness of the hard pipe 3 made of a thermoplastic resin, and the tubular shape is formed.
- the woven cloth 4 and the hard tube 3 are integrally molded.
- the tubular woven fabric 4 is made by weaving natural fibers or synthetic fibers and has a relatively coarse texture.
- Fig. 3 shows a cross section of a part of the repair pipe 1 pipe wall opened by cutting the repair pipe 1 shown in Fig. 2 in the length direction of the cylinder. It is composed of 5 and 6 weft threads woven into a tubular shape.
- the warp yarn 5 of the tubular woven fabric 4 exhibits a large elongation with a small load, does not extend further when it is extended by a predetermined amount, and supports a large load.
- a thread having the property of being able to be used is used.
- Fig. 4 is a schematic diagram of an example of a thread used as the warp thread 5, and is usually around an elastic thread 7 having elasticity such as a porridge.
- Nylon thread, elastic It is a force-balancing yarn made by spirally winding synthetic fiber yarn 8 such as tell yarn.
- the one shown in Fig. 4 is a single synthetic fiber thread 8 wound around the elastic thread 7, but apart from this example, two synthetic fiber threads are wound around the elastic thread 7. It is also possible to use a double covering yarn in which 8s are wound in opposite directions while crossing each other.
- this force-balancing yarn contracts due to the elasticity of the elastic yarn 7, and when a tensile force is applied to this, the elastic yarn 7 stretches and the synthetic fiber yarn 8 It can be extended by extending it linearly from its spiral shape, and it shows a large extension with an extremely small force.
- the synthetic fiber yarn 8 when the synthetic fiber yarn 8 is stretched by a predetermined amount and the synthetic fiber yarn 8 is in a straight line, the synthetic fiber yarn 8 bears the tensile load, and the synthetic fiber yarn 8 does not stretch any more, and a large load is applied. It can be supported.
- the warp yarn 5 can also be a crimped synthetic fiber yarn.
- the length of the crimped yarn is contracted by the single fiber that composes it, and when the crimp is released, it shows a large elongation with a small force and stretches by a predetermined amount. If the crimp is released for a long time, it will not be able to extend further even if it is pulled, and it will be able to support a large load.
- the synthetic fiber yarn 8 in the covering yarn it is also possible to use a crimped synthetic fiber yarn.
- the synthetic fiber yarn 8 that extends linearly has an extensibility due to the further unwinding, so it has extremely large extensibility.
- the synthetic fiber yarn 8 that has been unwound shows non-stretchability.
- the weft 6 of the tubular woven fabric 4 it is appropriate to use a normal non-stretchable synthetic fiber yarn, but it has elasticity to accommodate changes in the inner diameter of the pipeline 2. It is also preferable to use crimped yarn. ⁇
- the strength per unit width in the length direction when the repair pipe 1 is heated is increased by heating to expand the diameter (D) of the pipe 2 and the repair pipe 1. It is preferable that the product is 1.3 times or more the product of the pressure (P) of the pressure fluid.
- the pressure resistance performance in the length direction when the repair pipe 1 is regarded as a thin-walled circular pipe is theoretically able to withstand pressure if it is 0.25 DP or more per unit width.
- a large tensile force is partially applied to the repair pipe 1 outside the bend and it is stretched. Therefore, in order to withstand such tensile force, 1. It is appropriate to have a strength of 3 DP or more.
- the repair pipe 1 extends due to the above-mentioned tensile force due to the internal pressure, and it is necessary to properly follow the inner surface of the pipeline 2. It is preferable that the elongation in the length direction when a load equivalent to 1.3 DP is applied to the repair tube 1 is about 10 to 30%.
- the elongation of the repair tube 1 is 10% or less, it is outside the bend.
- the repair pipe 1 does not extend sufficiently at the side part, and it becomes difficult to run along the inner surface of the pipe 2. If it is extended by 30% or more, the repair tube 1 will be extended due to the internal pressure at the outer part of the bent part, but it will not be extended evenly over the whole, but will be extended locally. There is a risk that the wall thickness of the repair tube 1 will vary due to the part that is not used.
- the method of manufacturing the repair tube 1 of the matako is to pass the tubular woven cloth 4 through the head of the extruder and extrude the synthetic resin from the outer surface of the tubular woven cloth 4. Then, the synthetic resin is pushed inward through the texture of the tubular woven fabric 4 with extrusion pressure, and the inner and outer surfaces of the tubular woven fabric 4 are covered with the synthetic resin to integrate them into the hard tube 3. It is possible to form a repair tube 1 in which a tubular woven cloth 4 is embedded.
- FIG. 5 is a diagram showing a cross section of another embodiment of the repair pipe body 1 of the present invention.
- the tubular woven fabric 4 is arranged on the inner surface of the hard pipe 3.
- FIG. 6 is a diagram showing a cross section of another embodiment, in which a tubular woven fabric 4 is arranged on the outer surface of the hard tube 3. In each of these cases, the tubular woven fabric 4 is integrated with the rigid tube 3.
- FIG. 7 is a diagram showing a cross section of another embodiment, in which the hard tube 3 is formed by the inner layer resin layer 9 made of the thermoplastic resin and the outer layer resin layer 10. , The tubular woven cloth 4 is attached to the inner surface of the inner layer resin layer 9, and the tubular woven cloth 4 is integrated with the inner layer resin layer 9.
- the thermoplastic tree forming the inner layer resin layer 9 is formed.
- the fat a fat having a softening point higher than the temperature of the heating and pressurizing fluid sent into the repair pipe 1 inserted into the pipe 2 is used to form the outer layer resin layer 10.
- the thermoplastic resin to be used the one having a lower softening point than the thermoplastic resin forming the inner layer resin layer 9 is used.
- the softening point of the thermoplastic resin forming the outer layer resin layer 10 is lower than the temperature of the heating and pressurizing fluid sent into the repair tube 1, but it is limited to that. However, if the softening point is lower than that of the thermoplastic resin that forms the inner layer resin layer 9, the temperature of the heated and pressurized fluid may be slightly higher.
- thermoplastic resin forming the inner layer oil layer 9 a high-density polyester having a softening point of about 126 ° C is used as the thermoplastic resin forming the inner layer oil layer 9.
- thermoplastic resin forming the outer layer resin layer 10 a linear low-density polyester with a softening point of about 114 ° C is used, and as a heating and pressurizing fluid, 1.0 is also used.
- the method of manufacturing the repair tube 1 of the matako is to pass the tubular woven cloth 4 through the head of the double-layer extruder, and then pass the tubular woven cloth 4 through the head of the double-layer extruder, and then pass the inner layer from the outer surface of the tubular woven cloth 4.
- the thermoplastic resin that forms the resin layer 9 is extruded, the outer surface of the tubular woven fabric 4 is covered with the synthetic resin and integrated, and then the thermoplastic resin that forms the outer layer resin layer 10 is formed on the outside. It can be extruded and coated to form the repair tube 1.
- Figure 8 shows the state in which the repair pipe 1 according to the present invention is molded.
- 1 1 is an extruder
- 1 2 is a die of the extruder 11.
- Reference numeral 4 denotes a tubular woven fabric supplied from above the die 12, and the structure shown in Fig. 2 is obtained by extruding thermoplastic resin from the die 12 on both the inner and outer sides of the tubular woven fabric 4.
- the uncured cylindrical repair tube 1 is molded.
- the repair pipe 1 extruded from the die 12 is introduced into the water tank 13 provided below the die 12, cooled by the hot water 14, and inverted by the roller 15 provided in the water tank 13. At the same time, it is folded flat as shown in Fig. 9.
- the temperature at which the repair tube 1 is folded flat should be the temperature near the carbonization point of the thermoplastic resin. Linear low density as the material of the thermoplastic resin. When using a plastic (plasticization point 1 14 ° C), it is appropriate to fold it at a temperature of about 1 14 ⁇ 10 ° C.
- the repair tube 1 If the temperature at the time of folding is excessively high, the repair tube 1 will be heated later and will not swell, but the folding habit will remain strong and it will not be able to withstand the external pressure. If it is cooled to an excessively low temperature, a large force is required for folding, and the thermoplastic resin constituting the repair tube 1 is cracked.
- the repair pipe 1 folded flat in the roller 15 is further cooled, derived from hot water 14, and wound into a winding reel (not shown). , Used for passage to pipeline 2.
- Figure 10 shows the state in which the repair pipe 1 is inserted into the pipe 2. In Fig. 10, the repair tube 1 is wound around the reel 16 in a flatly folded state.
- both ends of the repair pipe 1 are airtightly closed by the filler 17 as shown in Fig. 11.
- the means for closing the end of the repair pipe 1 is not limited to the closing by the filler, but other closing means may be used, but in any case, the repair pipe 1 is closed. It is airtightly blocked so that outside air does not flow in.
- the repair tube 1 pulled out from the reel 16 as shown in Fig. 10 is first passed through the heating device 18 to be heated.
- the heating device 18 is a flexible tubular body in which a film layer 20 of soft rubber or synthetic resin is formed on the inner surface of a flat tubular woven fabric 19.
- a heated fluid inlet pipe 2 1 is provided in a part of it.
- a flat repair pipe 1 is passed through this heating device 18, and steam is sent between the repair pipe 1 and the heating device 18 from the heating fluid feed pipe 2 1. Therefore, heat the repair tube 1.
- the temperature at which the repair tube 1 is heated should be sufficiently lower than the softening point of the plastic resin forming the repair tube 1 and the temperature at which the thermoplastic resin can be deformed should be set. be. If linear low-density polyethylene is used as the thermoplastic resin, 80 to 90 ° C is appropriate.
- the repair tube 1 coming out of the heating device 18 is pushed by the rotary roller 22 at the center of the repair tube 1 as shown in Fig. 10. By pressing, the cross section is curved so that it becomes approximately V-shaped and u-shaped until it is flat.
- the repair pipe 1 whose cross section is curved so as to have a substantially V-shaped to U-shaped cross section is inserted into the pipe line 2.
- repair pipe 1 Since the repair pipe 1 is curved so that its cross section is approximately V-shaped to U-shaped, it is smaller than the inner diameter of pipe 2 as shown in Fig. 1. Since it is a mysterious thing, it should be passed through without creating excessive frictional resistance between it and the inner surface of the pipeline 2.
- the repair pipe 1 has been heated to a temperature that can be deformed by the heating device 18, and is in a deformable state. Therefore, there is a slight bend in the pipe 2. However, it can be passed through while bending along the bent part.
- pressurized steam is sent into the repair pipe 1 to heat the repair pipe 1 and the repair pipe 1. Apply internal pressure to the pipe body and inflate it into a cylindrical shape so that it runs along the inner surface of the pipe line 2.
- the repair tube 1 should be heated to a temperature sufficiently higher than the temperature previously heated by the heating device 18. Distortion due to the fact that the repair tube 1 is heated and the cross section is curved so that it becomes approximately V-shaped to U-shaped. However, if the heating is insufficient in this case, the repair tube 1 will remain distorted and cannot withstand the external pressure during use.
- FIG. 13 is a diagram showing another embodiment of the method of inserting the repair pipe body 1 of the present invention into the pipe line 2.
- the repair pipe 1 pulled out from the reel 1 6 has the tip of the hose 24, which has been inserted into the pipe 2 in advance, inserted into the tip of the repair pipe 1, and is airtightly closed. It is attached to the tip.
- the inside of the repair tube 1 is decompressed via the hose 24. Then, when the tow line 23 is towed from the end opposite to the side where the repair pipe body of the conduit 2 is inserted, the repair pipe body 1 is pulled out from the reel 16 and added. After being softened by the warming device 18, it is curved so that its cross section becomes approximately V-shaped to U-shaped while maintaining its flat shape, and it is inserted into the pipeline 2. In this example, the repair pipe 1 is decompressed from the front end side, but it can also be decompressed from the rear end side through the winding core of the reel 16.
- the pressure is reduced from one end side of the repair pipe 1 and the other end is airtightly closed, but the air that flows in from there is also decompressed. It is excluded, so it is not always necessary to block it.
- pressurized steam is sent into the repair pipe 1 as in the previous embodiment.
- the repair pipe 1 is heated and internal pressure is applied to the repair pipe 1 to inflate the pipe into a cylindrical shape and run along the inner surface of the pipe 2.
- FIG. 14 is a diagram showing another embodiment of the method of inserting the repair pipe 1 into the pipe 2.
- a tow hose 23 inserted in the pipe line 2 is connected to the tip of the repair pipe body 1 whose cross section is curved in a substantially V-shaped to U-shaped shape.
- a hose 25 is inserted in the pipeline in parallel with the towline 23, and the tip of the hose 25 is positioned at the tip of the repair pipe 1.
- a heating fluid such as steam is sent from the tip of the hose 25 between the repair pipe 1 and the pipe 2, and the repair pipe 1 is heated by the heating fluid, and the tow rope is used.
- a heating fluid such as steam is sent from the tip of the hose 25 between the repair pipe 1 and the pipe 2, and the repair pipe 1 is heated by the heating fluid, and the tow rope is used.
- the tow rope is used.
- FIG. 15 shows another embodiment of the present invention.
- the tip of the hose 25 is inserted into the terminal of the repair tube 1, and the hose 25 is inserted. From there, the heating fluid is sent into the repair pipe 1 to heat it, and the repair pipe 1 is pulled into the pipe 2 by the traction hose 23 and inserted.
- Figure 16 shows a state in which the cross-sectional shape of the pipe body is reduced in the lined pipeline. It also shows the process of making.
- Fig. 16 (a) is a diagram showing the state of the lined pipeline, where 2 is the pipeline and 1 is the pipe inserted along the inner surface of the pipeline 2. It is a tube.
- Figure 17 is a cross-sectional view of this lined pipeline 2.
- both ends 26 and 26'of the repair pipe 1 are peeled off from the inner surface of the pipe 2, and one end 26 is crushed and fused to make it airtight.
- the other end 26' shows the end of a hose 27 connected to a decompression pump (not shown).
- the repair tube 1 is shown in Fig. 16 (c) and Fig. 1. It becomes a state of being crushed and the shape of the cut surface is reduced. By pulling the repair pipe 1 from one of them in this state, the repair pipe 1 can be easily pulled out from the pipe 2.
- the repair tube 1 is usually made of a thermoplastic resin such as hard polyester or polyvinyl chloride and has considerable rigidity, so the inside of the repair tube 1 was decompressed. There are some things that are hard to collapse just by themselves. In such a case, the heating fluid is sent into the repair pipe 1 in advance, or the heating fluid is sent between the repair pipe 1 and the pipe 2 while reducing the pressure. It is preferable to heat the repair tube 1 to soften it.
- a thermoplastic resin such as hard polyester or polyvinyl chloride
- Figure 18 shows another example.
- the hose 28 is in the repair pipe 1 lined in the pipe 2.
- Pressurized steam is sent in to heat and soften the repair tube 1, and the repair tube 1 is filled with pressurized steam.
- both ends of the repair pipe 1 are shown in Fig. 18 (b). 2 6 and 2 6'are peeled off from the pipeline 2 and sealed tightly. The pressurized steam in this sealed repair tube 1 condensed as it cooled, and was crushed as shown in Fig. 18 (c) and Fig. 1. In the state, the cross-sectional shape is reduced. By pulling the repair pipe 1 from one of the ends in this state, it can be easily pulled out from the pipe 2.
- the repair tube 1 of the present invention is pressurized because the hard tube 3 and the tubular woven fabric 4 are integrated.
- the hard tube 3 and the tubular woven fabric 4 are integrated and inflated.
- the tubular woven fabric 4 since the tubular woven fabric 4 has never been expanded in diameter under pressure, it expands locally even if there are parts of the hard tube 3 with different degrees of softening. It expands evenly over the entire surface and adheres to pipeline 2.
- the repair pipe body 1 of the present invention is bent or folded so that the cross section becomes substantially U-shaped or V-shaped in the width direction in a flatly folded state, and this is inserted into the pipe line 2. do. Since the repair pipe 1 is mainly composed of a hard pipe 3 made of hard thermoplastic resin, the tension at the time of pulling in is borne by the hard pipe 3. .. The hard tube 3 stretches slightly due to the tensile force, but the amount of stretch is small and it does not stretch excessively.
- the repair pipe 1 is along the inside of the bend in the pipe 2 due to its tension, as shown in Fig. 19. Will be placed.
- both the rigid pipe 3 and the tubular woven fabric 4 can be stretched with a small force, so that the repair pipe 1 stretches in the outward direction of the bending part of the pipe 2 and in the length direction thereof. As a whole, it can be in a state along the inner surface of the pipeline.
- the path length of the outer part of the bent part of the conduit 2 is about twice the path length of the inner part, while the repair pipe 1 has 1.3 DP as described above. It stretches only 10 to 30% under load, and only the extensibility of the repair tube 1 at the bend allows the repair tube 1 to follow the conduit 2.
- Both the bent part and the straight part of the pipeline can be extended within the range where the extension amount of the repair pipe 1 is small, but when the extension amount exceeds the predetermined amount, it becomes tubular.
- Woven cloth 4 fresh The thread 5 is fully stretched and cannot be stretched any further, thereby supporting the tensile force.
- the conventional resin pipe 100 0 will have a wrinkle pipe 100 0 extended at the outer part of the bend. If the thickness is thin, wrinkles may occur on the inner side of the bend and cracks may occur.
- the repair pipe 1 of the present invention is a hard pipe 3. Reinforced with tubular woven fabric 4, the outer part of the bend was partially stretched and thinned, and the wrinkles on the inner part of the bend were cracked. There is no such thing as a song.
- the repair pipe body 1 in the outside part is extended by the internal pressure and is a pipe. Wrinkles can be formed along the outward direction of the bending part of the road 2, and there is no slack in the repair tube 1 even on the inside. It doesn't grow.
- the repair tube 1 is not locally overstretched and partially extremely thin or broken. O
- the repair pipe 1 of the present invention shown in FIG. 7, when the heating and pressurizing fluid is sent into the repair pipe 1, the repair pipe 1
- the inner layer resin layer 9 near the inner surface is not excessively softened because the softening point is higher than the temperature of the heated and pressurized fluid, and the strength does not decrease excessively. Therefore, the tubular woven fabric 4 Does not come off.
- the outer layer resin layer 10 has a lower softening point than the inner layer resin layer 9, the entire hard tube 3 is sufficiently softened.
- the hard pipe 3 and the tubular woven fabric 4 are integrated, the hard pipe 3 and the tubular woven cloth 4 are formed when they are pressurized by the heating and pressurizing fluid. It expands together with the woven fabric 4. Since the diameter of the tubular woven fabric 4 is hardly expanded even when pressure is applied, and the inner layer resin layer 9 and the tubular woven fabric 4 are not peeled off, the hard tube 3 is a part. There is no difference in the degree of softening, and there is no local expansion even at the bends of pipeline 2, and it expands uniformly over the entire surface and adheres to the inner wall of pipeline 2. do.
- the repair tube 1 molded into a cylindrical shape is folded flat at a temperature near the point of conversion, so that it is easy to release. It can be wound around and can be handled in a compact state as a flat belt-shaped article.
- the repair tube 1 is folded flat and is not folded in half as in the conventional example, so the shape is not habitual.
- the flat repair pipe 1 is heated and curved so that the cross section becomes approximately V-shaped to U-shaped, and then the pipe 2 is formed. Since it is inserted, the cross-sectional shape of the repair pipe 1 is reduced and it can be easily passed through the pipe 2. Can be done.
- the repair pipe 1 is temporarily in a state where the cross section is approximately V-shaped and U-shaped, which causes distortion, but then the repair pipe 1 is curved.
- the strain is eliminated and the strain is swelled by applying internal pressure in that state. It is possible to follow the whole.
- the repair pipe 1 After passing the repair pipe 1 into the pipe 2, if it is heated to above the above-mentioned temperature point, the repair pipe 1 will be removed until it is folded flat. However, if the heating temperature is lower than that, the flat folding habit remains.
- the repair tube 1 is in a flat state because the part that tends to protrude is pressed by the inner surface of the conduit even if there is a tendency for deformation to return to the flatly folded state.
- the cylinder is retained because it cannot be returned to.
- the repair tube 1 is heated and softened, so that shape memory is developed and the cut surface expands to become a spindle shape. Even so, since air does not flow in from the terminal of the repair tube 1, it is spindle-shaped. Air is not replenished inside the inflated interior, and it does not inflate o
- the tip of the hose 25 is positioned at the tip of the repair pipe 1, and the heating fluid is fed from the hose 25. Then, the repair pipe 1 is pulled into the pipe 2 while being heated, so that the repair pipe 1 does not get cold and hard during the pulling, and the pipe 2 bends. It is possible to smoothly follow the inner surface of the pipeline even at the barbed part.
- the tip of the repair tube 1 is heated particularly strongly. And the flexibility is maintained. Therefore, it is possible to easily change the direction by following the inner surface of the pipeline at any part such as a bend or a step in the pipeline 2.
- the repair pipe 1 lined along the inner surface of the pipe 2 is decompressed. Since it is crushed and its cross-sectional shape is reduced, the frictional resistance between the repair tube 1 and the line 2 is significantly reduced. Therefore, even in cases where the repair tube 1 cannot be pulled out to the extent that it is heated and softened. According to the method of the present invention, the cross-sectional shape of the repair pipe 1 can be reduced, and it can be easily pulled out with a small force. Even in such cases, the repair tube 1 can be easily pulled out as described above.
- the repair pipe body of the present invention and the pipe body of the conventional example were molded, and the effects of both were compared by a lining experiment on the pipe line.
- a repair pipe with an outer diameter of 151.6 »n and a wall thickness of 3.5 ⁇ is attached to the inner surface of a hard pipe 3 made of linear low-density polyethylene oil and integrated with the above-mentioned tubular woven cloth 4.
- a tubular woven fabric 4 was woven by using a yarn made by twisting 45 crimped yarns of interverted fibers and driving 10 yarns in 1 inch.
- the above-mentioned tubular woven fabric 4 is embedded and integrated in the wall thickness of the hard tube 3 made of linear low-density polyester resin, and the outer diameter is 136.9 m) n , A repair tube 1 with a wall thickness of 4. O was obtained.
- the tubular woven fabric 4 has the same configuration as that of Example 1, and the above-mentioned tubular woven fabric 4 is embedded in the wall thickness of the hard tube 3 made of polyvinyl chloride resin. By integrating, a repair tube 1 with an outer diameter of 151.8 mm and a wall thickness of 3.8 » n was obtained.
- a tube was formed only with linear low-density polyester oil, and a tube with an outer diameter of 149.1 » « and a wall thickness was obtained.
- a tubular woven fabric 4 was woven by using a yarn made by twisting two non-stretchable bulky yarns and driving 38 yarns in 1 inch.
- tubular fabric 4 are integrated in the linear low density po Re ethylene les down by Ri Do that the wall thickness of the rigid tube 3, the outer diameter 148. 8 m, the thickness 4. 1M B Obtained a tube.
- tubular body was formed only with polyvinyl chloride resin, and a tubular body with an outer diameter of 151.0 ⁇ ⁇ and a wall thickness of 4.2 « ⁇ was obtained.
- Example 1 Comparing the thicknesses of the inner part and the outer part of the bent part of the repair pipe at the bent part of the pipeline, there is almost no difference between the results of Example 1 and Example 2, and there is almost no difference between them.
- the outer part is about 20% thinner than the inner part. It was confirmed that the lining was not so biased as to cause a bad influence.
- the repair pipe 1 of the present invention there is a significant difference in length between the inside and the outside of the bend of the repair pipe at the bend of the pipe line 2.
- the pipe wall of the repair pipe body 1 in the outer part can be extended by the internal pressure to follow the outside of the bending part of the pipe line 2, and even inside the bending part, it can be repaired. There are no wrinkles on the tube 1.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Pipe Accessories (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94914558A EP0664202B1 (en) | 1993-05-24 | 1994-04-27 | Repairing pipe, conduit repairing method using the same pipe, and repairing pipe removing method |
CA002140925A CA2140925C (en) | 1993-05-24 | 1994-04-27 | Repairing pipe, method for repairing pipe lines therewith and method for removing the repairing pipe |
DE69420830T DE69420830T2 (de) | 1993-05-24 | 1994-04-27 | Reparaturrohr, leitungsreparaturverfahren unter verwendung dieses rohres und reparaturrohr entfernungsverfahren |
US08/367,359 US5671778A (en) | 1993-05-24 | 1994-04-27 | Repairing tube, method for repairing pipe lines therewith and method for removing the repairing tube |
NO950249A NO950249L (no) | 1993-05-24 | 1995-01-23 | Utbedringsrör for rörledninger, samt fremgangsmåte for å fore en rörledning med dette og fremgangsmåte for å fjerne en slik foring |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14549393A JP3156446B2 (ja) | 1993-05-24 | 1993-05-24 | 管路の補修用管体 |
JP5/145493 | 1993-05-24 | ||
JP06995594A JP3442463B2 (ja) | 1994-03-14 | 1994-03-14 | 管路の補修用管体 |
JP6/69955 | 1994-03-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994027808A1 true WO1994027808A1 (fr) | 1994-12-08 |
Family
ID=26411131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000704 WO1994027808A1 (fr) | 1993-05-24 | 1994-04-27 | Tuyau de reparation, procede de reparation d'un conduit au moyen dudit tuyau de reparation, et procede de retrait du tuyau de reparation |
Country Status (5)
Country | Link |
---|---|
US (1) | US5671778A (ja) |
EP (1) | EP0664202B1 (ja) |
CA (1) | CA2140925C (ja) |
DE (1) | DE69420830T2 (ja) |
WO (1) | WO1994027808A1 (ja) |
Families Citing this family (26)
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GB9526062D0 (en) * | 1995-12-20 | 1996-02-21 | Wood John | Pipes |
GB9626060D0 (en) | 1996-12-16 | 1997-02-05 | United Utilities Plc | Thermoplastic composite products |
DE19721822A1 (de) * | 1997-05-26 | 1998-12-03 | Janos Vasbanyai | Kunststoff-Futterrohr, Verfahren für seine Herstellung und Anwendung |
FI109429B (fi) * | 1998-11-09 | 2002-07-31 | Uponor Innovation Ab | Menetelmä putken tekemiseksi ja putki |
FR2790534B1 (fr) * | 1999-03-05 | 2001-05-25 | Drillflex | Procede et installation de mise en place d'une conduite cylindrique sur un support |
GB2350168B (en) * | 1999-05-18 | 2003-07-09 | Uponor Ltd | Lining a pipe |
US6306781B1 (en) | 1999-07-21 | 2001-10-23 | Senior Investments Ag | Expansion joint patch apparatus |
FR2812070B1 (fr) * | 2000-07-18 | 2002-10-04 | Gli Internat | Procede pour decoller d'une structure metallique un habillage protecteur plastique et application de ce procede |
US6423258B1 (en) * | 2000-07-31 | 2002-07-23 | American Pipe & Plastics, Inc. | Machine and method for providing folded pipe liners |
US20030038403A1 (en) * | 2001-08-21 | 2003-02-27 | American Pipe & Plastics, Inc. | Machine and method for providing folded pipe liners |
DE10203123C1 (de) * | 2002-01-25 | 2003-02-06 | Sgl Acotec Gmbh | Verbundrohr aus einer PTFE-Innenschicht und einer Deckschicht aus einem faserverstärkten Kunststoff |
US6813570B2 (en) * | 2002-05-13 | 2004-11-02 | Delphi Technologies, Inc. | Optimized convection based mass airflow sensor circuit |
WO2004069520A1 (es) * | 2003-02-10 | 2004-08-19 | Uralita Sistemas De Tuberias S.A. | Procedimiento de fabricación de tubería plana para transporte de fluido a alta presión y tubería así obtenida |
JP4250131B2 (ja) * | 2004-09-16 | 2009-04-08 | カナフレックスコーポレーション株式会社 | 排水管補修方法 |
US20080223469A1 (en) * | 2007-03-13 | 2008-09-18 | Hillel David Renassia | Multiple conduit-repair method |
US20130092316A1 (en) * | 2011-10-14 | 2013-04-18 | Rahul Pakal | Reinforced Liners For Pipelines |
FI126261B (fi) * | 2011-11-11 | 2016-09-15 | Uponor Infra Oy | Menetelmä olemassa olevan putken sisäpuoliseksi vuoraamiseksi ja sisävuorausputki |
EP3034921B1 (en) | 2012-04-19 | 2018-07-25 | GE Oil & Gas UK Limited | Method of producing a flexible pipe body |
MY186398A (en) * | 2012-06-29 | 2021-07-22 | Petroliam Nasional Berhad Petronas | Lining of pipelines to offshore installations |
US20140224373A1 (en) * | 2013-02-12 | 2014-08-14 | MPS Enterprises, Inc. | Lay-flat hose for oilfield hydraulic fracturing operations |
US9394056B2 (en) * | 2013-03-16 | 2016-07-19 | The Beoing Company | Air duct assembly and method of installing the same |
DE102013114630A1 (de) * | 2013-12-20 | 2015-06-25 | Trelleborg Pipe Seals Duisburg Gmbh | Auskleidungselement zur Sanierung einer Rohrleitung |
CN106104135B (zh) * | 2014-02-27 | 2018-03-02 | 国际壳牌研究有限公司 | 为管子加内衬的方法和系统 |
CN106381599A (zh) * | 2016-08-30 | 2017-02-08 | 天津工业大学 | 管道修复用管状苎麻/涤纶纺织复合材料 |
US10927995B2 (en) | 2018-11-06 | 2021-02-23 | Honeywell International Inc. | Methods for repairing component cored passages |
CN110553103A (zh) * | 2019-08-26 | 2019-12-10 | 阳江市新特体育科技用品有限公司 | 一种新型伸缩水管及其制造方法 |
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- 1994-04-27 WO PCT/JP1994/000704 patent/WO1994027808A1/ja active IP Right Grant
- 1994-04-27 CA CA002140925A patent/CA2140925C/en not_active Expired - Lifetime
- 1994-04-27 US US08/367,359 patent/US5671778A/en not_active Expired - Lifetime
- 1994-04-27 DE DE69420830T patent/DE69420830T2/de not_active Expired - Lifetime
- 1994-04-27 EP EP94914558A patent/EP0664202B1/en not_active Expired - Lifetime
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JPH0347733A (ja) * | 1989-07-17 | 1991-02-28 | Japan Steel & Tube Constr Co Ltd | 反転ライニング用内張り材 |
JPH03151225A (ja) * | 1989-11-09 | 1991-06-27 | Japan Steel & Tube Constr Co Ltd | ライニング工法 |
JPH03256727A (ja) * | 1990-03-07 | 1991-11-15 | Nisshinbo Ind Inc | 非掘削反転ライニング工法に用いるライニング用チューブおよび加温用チューブ |
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Also Published As
Publication number | Publication date |
---|---|
DE69420830D1 (de) | 1999-10-28 |
EP0664202B1 (en) | 1999-09-22 |
US5671778A (en) | 1997-09-30 |
EP0664202A1 (en) | 1995-07-26 |
CA2140925C (en) | 2005-02-22 |
EP0664202A4 (en) | 1996-05-01 |
CA2140925A1 (en) | 1994-11-25 |
DE69420830T2 (de) | 2000-03-09 |
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