EP2225418A1 - Method of manually restoring an inner surface of a corrugated steel tube - Google Patents

Method of manually restoring an inner surface of a corrugated steel tube

Info

Publication number
EP2225418A1
EP2225418A1 EP08859845A EP08859845A EP2225418A1 EP 2225418 A1 EP2225418 A1 EP 2225418A1 EP 08859845 A EP08859845 A EP 08859845A EP 08859845 A EP08859845 A EP 08859845A EP 2225418 A1 EP2225418 A1 EP 2225418A1
Authority
EP
European Patent Office
Prior art keywords
tube
coating
corrugated
corrugated tube
cte
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08859845A
Other languages
German (de)
French (fr)
Other versions
EP2225418A4 (en
Inventor
Pär WALLENTHEIM
Hans SÖNKSEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WBF Invest AB
Original Assignee
WBF Invest AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WBF Invest AB filed Critical WBF Invest AB
Publication of EP2225418A1 publication Critical patent/EP2225418A1/en
Publication of EP2225418A4 publication Critical patent/EP2225418A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
    • E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
    • 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
    • F16L55/164—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing fluid being introduced in the pipe
    • 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
    • F16L2101/00—Uses or applications of pigs or moles
    • F16L2101/10—Treating the inside of pipes
    • F16L2101/12—Cleaning
    • 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
    • F16L2101/00—Uses or applications of pigs or moles
    • F16L2101/10—Treating the inside of pipes
    • F16L2101/16—Coating by application of fluent materials, e.g. painting

Definitions

  • the present invention relates generally to a method of manually restoring an inner surface of a corrugated steel tube forming part of a system for guiding water in association with an infrastructure, such under as roads, bridges and railroads,
  • corrugated steel tubes under or in conjunction with the infrastructure.
  • These corrugated steel tubes are arranged to support the drainage of accumulated water.
  • a typical example occurs when snow melts and water builds up on one side of the infrastructure.
  • the corrugated steel tubes allow the water to flow naturally from one side of the infrastructure to the other.
  • the corrugated steel tubes have a corrugated shape to provide additional strength, maintain its structural integrity and as part of a low cost manufacturing process.
  • the corrugated steel tube is normally laid out in a rough environment and the inner surface of the steel tube is exposed to ferrous corrosion due to being constantly exposed to water, pollutions, solutions containing road salt, etc. Such ferrous corrosion is disadvantageous since it damages the steel tube, resulting in leakage and possibly also a diminished structural strength and integrity.
  • an alternative is to replace the corrugated tube and another alternative is to repair the existing corrugated tube.
  • the first alternative i.e. which implies that the tube has to be replaced, results in that the road, bridge or railroad must be closed or diverted for a certain time period while the road, bridge or railroad is dug up in order to replace the corrugated steel tube. Upon replacement the road, bridge or railroad is restored and commerce can resume with the proper infrastructure in place.
  • a drawback with this alternative is that this method is time- consuming, expensive and can have a negative impact on commercial activities that use this infrastructure.
  • the second alternative is to repair the inner surface of the corrugated steel tube by spraying the inner surface with a layer of concrete.
  • a drawback with this method is that the concrete must be added in the form of a very thick layer, which results in that the inside diameter of the corrugated steel tube gets smaller and thus the corrugated steel tube can guide less water per unit of time than before.
  • Another drawback with this alternative is that the system for guiding flooding water has to be shut off when the concrete is added and sealed to the corrugated steel tubes with an epoxy resin, which takes approximately 7 days and nights.
  • Another drawback to this method is that the inner surface of the corrugated steel tube loses its corrugated shape.
  • a third alternative is to insert a new smaller tube inside the original corrugated steel tube and inject the space between the two tubes with foam concrete to create a lasting seal.
  • This method dramatically reduces the throughput of the original tube since it guides less water per unit of time than before. When the throughput of the pipe is reduced it may result in tube blockages that are responsible for flooding and/or severely damaged infrastructure.
  • One object of the present invention is consequently to provide a method of manually restoring an inner surface of a corrugated steel tube forming part of a system for guiding water under roads, bridges and railroads which restoring method is faster and consequently more cost-effective than the replacement process.
  • the invention relates to a method of manually restoring an inner surface of a corrugated steel tube forming part of a system for guiding water in association with an infrastructure, such under as roads, bridges and railroads.
  • the method includes the steps of cleaning the inner surface of the corrugated tube from remaining water and sediments; finishing the inner surface by removing surface roughness created by ferrous corrosion; repairing any occurring cavities, created by the ferrous corrosion, on the inner surface with a filler material and/or steel sheets and/or wire netting; and covering the inner surface with a coating to create long time corrosion protection and restore the structural integrity.
  • the cleaning of the inner surface is suitably preceded by dewatering the corrugated tube.
  • the inner surface is finished by sand blasting or a similar process, which is performed with a starting point from the central part of the corrugated tube in the longitudinal direction towards respective opening in the ends of the corrugated tube, after which the remaining sand blasting components are removed from the inner surface.
  • the inner surface is coated with a polyester coating, preferably a quick curing, high build, abrasion resistant and styrene free glass flake reinforced polyester coating, that gives a long time corrosion protection, which is thin enough to maintain a corrugated surface structure of the corrugated tube.
  • a polyester coating preferably a quick curing, high build, abrasion resistant and styrene free glass flake reinforced polyester coating, that gives a long time corrosion protection, which is thin enough to maintain a corrugated surface structure of the corrugated tube.
  • the inner surface is suitably coated with a product known as "Baltoflake Ecolife Tubus", which is marketed by WBF Invest AB, Sweden.
  • the coating of the inner surface is preceded by a heating of the inner surface to create an appropriate temperature of the inner surface before the coating is applied.
  • the sand blasting and coating steps are performed over the entire circumference of the ends of the inner surface, and over most of the lower inner surface between the ends, in order to minimize workload and paint consumption.
  • the step of repairing cavities is performed with a polyurethane foam or like substance.
  • the polyurethane foam is provided on the inner surface in an abundance, to fill up the cavities in the inner surface.
  • the abundance of the polyurethane foam is scraped off and removed from the inner surface of the corrugated steel tube.
  • the repairing of the cavities is undertaken to create a substantially flat inner surface, in order to be able to create a substantially continuous inner surface without any through holes wherein water can leak out of the corrugated steel tube.
  • Fig. 1 shows a schematic section view of a corrugated tube during a cleaning and a finishing step, respectively;
  • Fig. 2 shows a schematic perspective view of the corrugated tube during a repairing step
  • Fig. 3 shows a schematic perspective view of the corrugated tube during a coating step.
  • One or more large corrugated steel tubular elements are provided in association with a certain infrastructure, such as a road, bridge or railroad.
  • a certain infrastructure such as a road, bridge or railroad.
  • the tubular elements are laid out under such a road, bridge or railroad in order to prevent flooding of the road during cloudbursts or in the case when water has to be drained off from one side of the road, bridge or railroad to the other side, which can be the case when a watercourse is located on one side of the infrastructure.
  • Fig. 1 shows a schematic perspective view of a corrugated steel tube 1 during a cleaning step according to a manually restoring method in accordance with the invention.
  • the tube 1 is composed of one upper part 2 and one lower part 3.
  • the water which flows through the steel tube 1 is normally only in contact with the lower part 3, meaning that the lower part 3 is more often exposed to corrosion and damage than the upper part 2.
  • the method according to the invention normally includes repairing the lower part 3 only.
  • the invention is not limited to this approach only, i.e. the invention may be used to restore the entire interior of the tube 1 if needed.
  • the tube 1 has suitably a length of approximately 20-40 meter and a material thickness of 2,5 - 4 millimeter.
  • the diameter of the tube 1 is normally large enough to locate a human operator 4 inside the tube 1 , who performs the restoring of the interior of the pipe.
  • the tube 1 has a corrugated shape, shown in Fig. 3, to attain its structural integrity.
  • the method according to the described embodiment preferably includes the steps of cleaning, finishing, repairing, and covering of the interior surface of the tube. These steps will now be described in greater detail with reference to the drawings.
  • the tube system for guiding water has to be shut off to be able to drain the tube 1 , which can be made in a conventional way by providing a sump, a damming etc.
  • the interior surface 10 of the tube 1 is then cleaned from remaining water and sediments by a slurry exhauster. Remaining water after the slurry exhauster has been used is blown off with a blasting device 5.
  • the finishing is performed to remove parts of the interior surface 10 presenting a high degree of roughness created by ferrous corrosion 6.
  • the interior surface 10 is preferably finished by sand blasting, which is performed with a starting point from the central part of the corrugated tube 1 and in the longitudinal direction towards each opening 7 in the ends of the corrugated tube 1 , whereafter the remaining sand blasting components are removed from the inner surface 10.
  • the remaining sand blasting material is preferably blown off with the sand blasting equipment.
  • the procedure starting from the central part of the tube 1 has the advantage of leaving a minimum of sand blasting material behind in valleys in the corrugated inner surface 10 of the tube i .
  • the tube 1 It is optional to finish the entire 360° inner circumference of the tube 1 or, due to for example reasons of cost-effectiveness, it is optional to finish a part of the tube 1. In the case where only a part of the tube 1 is finished, the lower section i.e. more than the lower inner 180° circumference of the tube 1 is finished, and the entire 360° inner circumferences of the ends of the tube are finished. The finishing of the ends extends approximately 0,5 meter into the tube.
  • a filler material 9 and/or steel sheets and/or wire netting is provided with a filler material 9 and/or steel sheets and/or wire netting.
  • a polyurethane foam or like material is used to fill in the holes 8, shown in Fig. 2.
  • the polyurethane foam is supplied in excess, this to fill up the holes 8.
  • the excess foam is removed to create a substantially flat corrugated inner surface 10, i.e. so that a substantially continuous inner surface 10 is created without any through holes 8 wherein water can leak through after the covering has been applied.
  • steel sheets or wire netting are mounted on to the interior surface 10.
  • the tube 1 and its interior surface 10 are heated to create an appropriate temperature before a coating is applied.
  • the heating of the interior surface 10 is preferably performed with a hot-air device. Before the hot-air device is turned on, the openings 7 in the ends of the tube 1 are covered to preserve the hot air inside the tube 1. When the interior surface 10 has reached the appropriate temperature, the coating is applied to create a long time corrosion protection and to restore the structural integrity of the corrugated steel tube. The coating is applied in a direction from one end of the tube to the other end of the tube. During the application of the coating the openings 7 of the tube are still covered as part of the curing process.
  • the coating is preferably a coating named "Baltoflake Ecolife Tubus", a quick curing, high build, abrasion resistant and styrene free glass flake reinforced polyester coating, which is put on the market by WBF Invest AB, Sweden.
  • the coating is thin enough, preferably 2 - 5 millimetres, to maintain the corrugated structure of the corrugated tube 1 and generally maintain the original throughput of the tube 1.
  • the thickness of the applied coating layer can be estimated by measuring the consumption of the coating material per length unit of the steel tube 1 and preferably with a wet film measuring device.
  • the tube 1 and the interior surface 10 are heated to a suitable temperature before the coating is applied.
  • This heating process is suitably controlled in a manner so that the tube 1 and the interior surface 10 are heated sufficiently so that there is no risk of rust being formed on the interior surface 10.
  • this purpose is achieved by heating the tube 1 to a temperature which is suitably above the point at which the vapor in the surrounding air is condensed, which otherwise could mean that it may cover the interior surface 10 and thereby cause an inferior application of coating.
  • the heating is carried out in order to minimize the risk for rust being formed on the interior surface 10, i.e. in order to prevent moisture in the form of condensed water (i.e. dew) from covering the interior surface 10.
  • the actual temperature chosen for the heating may naturally vary depending on circumstances such as the surrounding air temperature, the temperature of the tube 1 , the surrounding air humidity and other factors.
  • the temperature chosen is normally well above the dew point, i.e. the point at which condensation of dew may occur.
  • the heating of the interior surface 10 is preferably maintained at a sufficiently high temperature (as described above) during the entire time when the applied coating is drying.
  • a masking tape is applied above the area that is to be coated, to create a straight coating edge.
  • a masking tape is applied above the area that is to be coated, to create a straight coating edge.
  • Curing time is temperature dependent. When the coating has been applied, it takes 140-180 minutes before the coating has cured, in an environmental temperature of 5 C°. This is mentioned as an example only. Different time periods for curing apply for different temperature ranges.
  • the method is finished by visual inspection of the coated interior surface.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Bridges Or Land Bridges (AREA)
  • Pipe Accessories (AREA)

Abstract

The invention relates to a method of manually restoring an inner surface (10) of a corrugated steel tube (1) forming part of a system for guiding water in association with an infrastructure, such under as roads, bridges and railroads.The method includes the steps of cleaning, finishing, repairing and coating. The inner surface (10) of the corrugated tube (1)is cleaned from remaining water and sediments, whereafter the inner surface (10)is finished to remove surface roughness created by ferrous corrosion(6). The occurring cavities, created by the ferrous corrosion, on the inner surface is repaired with a filler material and/or steel sheets and/or wire netting, whereafter the inner surface (10) is covered with a coating to create long time corrosion protection and restore the structural integrity.

Description

METHOD OF MANUALLY RESTORING AN INNER SURFACE OF A CORRUGATED STEEL TUBE
TECHNICAL FIELD The present invention relates generally to a method of manually restoring an inner surface of a corrugated steel tube forming part of a system for guiding water in association with an infrastructure, such under as roads, bridges and railroads,
BACKGROUND ART
To prevent flooding and to support the natural flow of water that has been impacted by the building of infrastructure such as roads, bridges and railroads, there is provided one or more large corrugated steel tubes under or in conjunction with the infrastructure. These corrugated steel tubes are arranged to support the drainage of accumulated water. A typical example occurs when snow melts and water builds up on one side of the infrastructure. In such a situation, the corrugated steel tubes allow the water to flow naturally from one side of the infrastructure to the other. The corrugated steel tubes have a corrugated shape to provide additional strength, maintain its structural integrity and as part of a low cost manufacturing process.
The corrugated steel tube is normally laid out in a rough environment and the inner surface of the steel tube is exposed to ferrous corrosion due to being constantly exposed to water, pollutions, solutions containing road salt, etc. Such ferrous corrosion is disadvantageous since it damages the steel tube, resulting in leakage and possibly also a diminished structural strength and integrity. For this reason, an alternative is to replace the corrugated tube and another alternative is to repair the existing corrugated tube. The first alternative, i.e. which implies that the tube has to be replaced, results in that the road, bridge or railroad must be closed or diverted for a certain time period while the road, bridge or railroad is dug up in order to replace the corrugated steel tube. Upon replacement the road, bridge or railroad is restored and commerce can resume with the proper infrastructure in place. A drawback with this alternative is that this method is time- consuming, expensive and can have a negative impact on commercial activities that use this infrastructure.
The second alternative is to repair the inner surface of the corrugated steel tube by spraying the inner surface with a layer of concrete. A drawback with this method is that the concrete must be added in the form of a very thick layer, which results in that the inside diameter of the corrugated steel tube gets smaller and thus the corrugated steel tube can guide less water per unit of time than before. Another drawback with this alternative is that the system for guiding flooding water has to be shut off when the concrete is added and sealed to the corrugated steel tubes with an epoxy resin, which takes approximately 7 days and nights. Another drawback to this method is that the inner surface of the corrugated steel tube loses its corrugated shape.
A third alternative is to insert a new smaller tube inside the original corrugated steel tube and inject the space between the two tubes with foam concrete to create a lasting seal. This method dramatically reduces the throughput of the original tube since it guides less water per unit of time than before. When the throughput of the pipe is reduced it may result in tube blockages that are responsible for flooding and/or severely damaged infrastructure.
Consequently, a problem within this field of technology is that the corrugated steel tubes of the above-mentioned kind need to be restored or repaired in a more cost-effective manner than replacement and without impact to the structural integrity or throughput of the original tube. SUMMARY OF THE INVENTION
One object of the present invention is consequently to provide a method of manually restoring an inner surface of a corrugated steel tube forming part of a system for guiding water under roads, bridges and railroads which restoring method is faster and consequently more cost-effective than the replacement process.
It is another object of the present invention to provide a method of manually restoring an inner surface of a corrugated steel tube, which method entails that the corrugated inner surface of the pipe and thus also the structural integrity of the pipe can be preserved.
The above problems have been solved by a method according to the appended claims.
According to an embodiment, the invention relates to a method of manually restoring an inner surface of a corrugated steel tube forming part of a system for guiding water in association with an infrastructure, such under as roads, bridges and railroads.
The method includes the steps of cleaning the inner surface of the corrugated tube from remaining water and sediments; finishing the inner surface by removing surface roughness created by ferrous corrosion; repairing any occurring cavities, created by the ferrous corrosion, on the inner surface with a filler material and/or steel sheets and/or wire netting; and covering the inner surface with a coating to create long time corrosion protection and restore the structural integrity. The cleaning of the inner surface is suitably preceded by dewatering the corrugated tube. The inner surface is finished by sand blasting or a similar process, which is performed with a starting point from the central part of the corrugated tube in the longitudinal direction towards respective opening in the ends of the corrugated tube, after which the remaining sand blasting components are removed from the inner surface.
The inner surface is coated with a polyester coating, preferably a quick curing, high build, abrasion resistant and styrene free glass flake reinforced polyester coating, that gives a long time corrosion protection, which is thin enough to maintain a corrugated surface structure of the corrugated tube.
The inner surface is suitably coated with a product known as "Baltoflake Ecolife Tubus", which is marketed by WBF Invest AB, Sweden. The coating of the inner surface is preceded by a heating of the inner surface to create an appropriate temperature of the inner surface before the coating is applied.
The sand blasting and coating steps are performed over the entire circumference of the ends of the inner surface, and over most of the lower inner surface between the ends, in order to minimize workload and paint consumption.
The step of repairing cavities is performed with a polyurethane foam or like substance. The polyurethane foam is provided on the inner surface in an abundance, to fill up the cavities in the inner surface. The abundance of the polyurethane foam is scraped off and removed from the inner surface of the corrugated steel tube. The repairing of the cavities is undertaken to create a substantially flat inner surface, in order to be able to create a substantially continuous inner surface without any through holes wherein water can leak out of the corrugated steel tube.
The above described method is finished by visual inspection of the inner surface of the corrugated tube. BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in detail with reference to the attached figures. It is to be understood that the drawings are designed solely for the purpose of illustration and are not intended as a definition of the limits of the invention, for which reference should be made to the appended claims. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to schematically illustrate the structures and procedures described herein.
Fig. 1 shows a schematic section view of a corrugated tube during a cleaning and a finishing step, respectively;
Fig. 2 shows a schematic perspective view of the corrugated tube during a repairing step; and
Fig. 3 shows a schematic perspective view of the corrugated tube during a coating step.
DETAILED DESCRIPTION
One or more large corrugated steel tubular elements are provided in association with a certain infrastructure, such as a road, bridge or railroad. Suitably, the tubular elements are laid out under such a road, bridge or railroad in order to prevent flooding of the road during cloudbursts or in the case when water has to be drained off from one side of the road, bridge or railroad to the other side, which can be the case when a watercourse is located on one side of the infrastructure.
Fig. 1 shows a schematic perspective view of a corrugated steel tube 1 during a cleaning step according to a manually restoring method in accordance with the invention. The tube 1 is composed of one upper part 2 and one lower part 3. Normally, the water which flows through the steel tube 1 is normally only in contact with the lower part 3, meaning that the lower part 3 is more often exposed to corrosion and damage than the upper part 2. As a result, the method according to the invention normally includes repairing the lower part 3 only. However, the invention is not limited to this approach only, i.e. the invention may be used to restore the entire interior of the tube 1 if needed.
The tube 1 has suitably a length of approximately 20-40 meter and a material thickness of 2,5 - 4 millimeter. The diameter of the tube 1 is normally large enough to locate a human operator 4 inside the tube 1 , who performs the restoring of the interior of the pipe. The tube 1 has a corrugated shape, shown in Fig. 3, to attain its structural integrity.
The method according to the described embodiment preferably includes the steps of cleaning, finishing, repairing, and covering of the interior surface of the tube. These steps will now be described in greater detail with reference to the drawings.
First of all, the tube system for guiding water has to be shut off to be able to drain the tube 1 , which can be made in a conventional way by providing a sump, a damming etc.
The interior surface 10 of the tube 1 is then cleaned from remaining water and sediments by a slurry exhauster. Remaining water after the slurry exhauster has been used is blown off with a blasting device 5.
The finishing is performed to remove parts of the interior surface 10 presenting a high degree of roughness created by ferrous corrosion 6. The interior surface 10 is preferably finished by sand blasting, which is performed with a starting point from the central part of the corrugated tube 1 and in the longitudinal direction towards each opening 7 in the ends of the corrugated tube 1 , whereafter the remaining sand blasting components are removed from the inner surface 10. The remaining sand blasting material is preferably blown off with the sand blasting equipment. The procedure starting from the central part of the tube 1 has the advantage of leaving a minimum of sand blasting material behind in valleys in the corrugated inner surface 10 of the tube i .
It is optional to finish the entire 360° inner circumference of the tube 1 or, due to for example reasons of cost-effectiveness, it is optional to finish a part of the tube 1. In the case where only a part of the tube 1 is finished, the lower section i.e. more than the lower inner 180° circumference of the tube 1 is finished, and the entire 360° inner circumferences of the ends of the tube are finished. The finishing of the ends extends approximately 0,5 meter into the tube.
The repairing of any occurring cavities 8, created by the ferrous corrosion 6 or other damages, on the interior surface 10 is provided with a filler material 9 and/or steel sheets and/or wire netting. In the case when smaller holes 8 are to be mended, a polyurethane foam or like material is used to fill in the holes 8, shown in Fig. 2. The polyurethane foam is supplied in excess, this to fill up the holes 8. When the polyurethane foam has hardened, the excess foam is removed to create a substantially flat corrugated inner surface 10, i.e. so that a substantially continuous inner surface 10 is created without any through holes 8 wherein water can leak through after the covering has been applied. In the case when larger holes are to be mended, steel sheets or wire netting are mounted on to the interior surface 10.
The tube 1 and its interior surface 10 are heated to create an appropriate temperature before a coating is applied.
The heating of the interior surface 10 is preferably performed with a hot-air device. Before the hot-air device is turned on, the openings 7 in the ends of the tube 1 are covered to preserve the hot air inside the tube 1. When the interior surface 10 has reached the appropriate temperature, the coating is applied to create a long time corrosion protection and to restore the structural integrity of the corrugated steel tube. The coating is applied in a direction from one end of the tube to the other end of the tube. During the application of the coating the openings 7 of the tube are still covered as part of the curing process.
The coating is preferably a coating named "Baltoflake Ecolife Tubus", a quick curing, high build, abrasion resistant and styrene free glass flake reinforced polyester coating, which is put on the market by WBF Invest AB, Sweden. The coating is thin enough, preferably 2 - 5 millimetres, to maintain the corrugated structure of the corrugated tube 1 and generally maintain the original throughput of the tube 1. The thickness of the applied coating layer can be estimated by measuring the consumption of the coating material per length unit of the steel tube 1 and preferably with a wet film measuring device.
As mentioned above, the tube 1 and the interior surface 10 are heated to a suitable temperature before the coating is applied. This heating process is suitably controlled in a manner so that the tube 1 and the interior surface 10 are heated sufficiently so that there is no risk of rust being formed on the interior surface 10. According to the embodiment, this purpose is achieved by heating the tube 1 to a temperature which is suitably above the point at which the vapor in the surrounding air is condensed, which otherwise could mean that it may cover the interior surface 10 and thereby cause an inferior application of coating. In other words, the heating is carried out in order to minimize the risk for rust being formed on the interior surface 10, i.e. in order to prevent moisture in the form of condensed water (i.e. dew) from covering the interior surface 10. The actual temperature chosen for the heating may naturally vary depending on circumstances such as the surrounding air temperature, the temperature of the tube 1 , the surrounding air humidity and other factors. Suitably, the temperature chosen is normally well above the dew point, i.e. the point at which condensation of dew may occur. Also, the heating of the interior surface 10 is preferably maintained at a sufficiently high temperature (as described above) during the entire time when the applied coating is drying.
In the case when the coating only is going to be applied on the lower section of the tube 1 , a masking tape is applied above the area that is to be coated, to create a straight coating edge. Thus, only the lower section, more than the lower inner 180° circumference, of the tube is coated, and the entire 360° inner circumferences of the ends of the tube are coated, shown in Fig. 3. The coating of the ends extends approximately 0,5 meter into the tube 1. The coated area is shown at 11 and the uncoated area is shown at 12.
Curing time is temperature dependent. When the coating has been applied, it takes 140-180 minutes before the coating has cured, in an environmental temperature of 5 C°. This is mentioned as an example only. Different time periods for curing apply for different temperature ranges.
The method is finished by visual inspection of the coated interior surface.
The invention is not limited to the above examples, but may be varied freely within the scope of the appended claims.

Claims

1. Method of manually restoring an inner surface (10) of a corrugated steel tube (1) forming part of a system for guiding water in association with an infrastructure, such under as roads, bridges and railroads, ch aracterized in that it includes the steps of:
- cleaning the inner surface (10) of the corrugated tube (1) from remaining water and sediments; - finishing the inner surface (10) by removing surface roughness created by ferrous corrosion (6);
- repairing any occurring cavities (8), created by the ferrous corrosion (6), on the inner surface (10) with a filler material (9) and/or steel sheets and/or wire netting; and - covering the inner surface (10) with a coating to create long time corrosion protection and restore the structural integrity.
2. Method according to claim 1, ch aracterized in that the cleaning of the inner surface (10) is preceded by dewatering the corrugated tube (1).
3. Method according to claim 1 or 2, ch aracterized in that the inner surface (10) is finished by sand blasting.
4. Method according to claim 3, ch a racterized in that the sand blasting is performed with a starting point from the central part of the corrugated tube (1) in the longitudinal direction towards respective opening (7) in the ends of the corrugated tube (1), whereafter the remaining sand blasting components are removed from the inner surface (10).
5. Method according to claim 1, ch a racterized in that the inner surface (10) is coated with a polyester coating, which is thin enough to maintain a corrugated surface structure of the corrugated tube (1).
6. Method according to claim 5, c h a ra cte ri zed in that the inner surface (10) is coated with "Baltoflake Ecolife Tubus" paint.
7. Method according to claim 5 or 6, c h a ra cte ri zed in that the coating of the inner surface (10) is preceded by a heating of the inner surface to create an appropriate temperature of the inner surface (10) before the coating is applied.
8. Method according to claim 2-7, c h a ra cte ri zed in that sand blasting and coating is performed over the entire circumference of the ends of the inner surface (10), and over most of the lower inner surface between the ends.
9. Method according to claim 1, c h a ra cte ri ze d in that the repairing cavities (8) are performed with a polyurethane foam or like material.
10. Method according to claim 1-9, c h a ra cte ri zed in that the method is finished by visual inspection of the inner surface 10 of the corrugated tube.
EP08859845A 2007-12-12 2008-12-12 Method of manually restoring an inner surface of a corrugated steel tube Withdrawn EP2225418A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0702779A SE531827C2 (en) 2007-12-12 2007-12-12 Method for manual renovation of an inner surface layer in a corrugated steel pipe
PCT/SE2008/051447 WO2009075647A1 (en) 2007-12-12 2008-12-12 Method of manually restoring an inner surface of a corrugated steel tube

Publications (2)

Publication Number Publication Date
EP2225418A1 true EP2225418A1 (en) 2010-09-08
EP2225418A4 EP2225418A4 (en) 2012-03-14

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EP08859845A Withdrawn EP2225418A4 (en) 2007-12-12 2008-12-12 Method of manually restoring an inner surface of a corrugated steel tube

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EP (1) EP2225418A4 (en)
RU (1) RU2010128533A (en)
SE (1) SE531827C2 (en)
WO (1) WO2009075647A1 (en)

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US10094506B2 (en) * 2015-07-22 2018-10-09 Marketing Associates, Inc. Corrugated metal pipe repair system and method
CN110158492B (en) * 2019-05-21 2021-01-22 无锡市水利设计研究院有限公司 Bridge and culvert structure

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Also Published As

Publication number Publication date
EP2225418A4 (en) 2012-03-14
WO2009075647A1 (en) 2009-06-18
RU2010128533A (en) 2012-01-20
SE0702779L (en) 2009-06-13
SE531827C2 (en) 2009-08-18

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