GB2032570A - Method for the repair of damaged surfaces - Google Patents
Method for the repair of damaged surfaces Download PDFInfo
- Publication number
- GB2032570A GB2032570A GB7930574A GB7930574A GB2032570A GB 2032570 A GB2032570 A GB 2032570A GB 7930574 A GB7930574 A GB 7930574A GB 7930574 A GB7930574 A GB 7930574A GB 2032570 A GB2032570 A GB 2032570A
- Authority
- GB
- United Kingdom
- Prior art keywords
- foam
- shuttering
- damaged
- mixture
- damaged surface
- 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000008439 repair process Effects 0.000 title description 9
- 239000006260 foam Substances 0.000 claims abstract description 36
- 238000009416 shuttering Methods 0.000 claims abstract description 30
- 229920003023 plastic Polymers 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 34
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 3
- 229920003225 polyurethane elastomer Polymers 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 229920006337 unsaturated polyester resin Polymers 0.000 claims description 2
- 239000004615 ingredient Substances 0.000 abstract description 10
- 230000002787 reinforcement Effects 0.000 abstract description 5
- 229920005830 Polyurethane Foam Polymers 0.000 abstract description 4
- 239000011496 polyurethane foam Substances 0.000 abstract description 4
- 230000001464 adherent effect Effects 0.000 abstract 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 9
- 229920005862 polyol Polymers 0.000 description 8
- 150000003077 polyols Chemical class 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 7
- 239000004604 Blowing Agent Substances 0.000 description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920001228 polyisocyanate Polymers 0.000 description 6
- 239000005056 polyisocyanate Substances 0.000 description 6
- 229920002635 polyurethane Polymers 0.000 description 6
- 239000004814 polyurethane Substances 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 239000012948 isocyanate Substances 0.000 description 5
- 150000002513 isocyanates Chemical class 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 239000012779 reinforcing material Substances 0.000 description 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- IRIAEXORFWYRCZ-UHFFFAOYSA-N Butylbenzyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCC1=CC=CC=C1 IRIAEXORFWYRCZ-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229920002396 Polyurea Polymers 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000006071 cream Substances 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000011495 polyisocyanurate Substances 0.000 description 2
- 229920000582 polyisocyanurate Polymers 0.000 description 2
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000003139 biocide Substances 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012975 dibutyltin dilaurate Substances 0.000 description 1
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 1
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 1
- ZZTCPWRAHWXWCH-UHFFFAOYSA-N diphenylmethanediamine Chemical compound C=1C=CC=CC=1C(N)(N)C1=CC=CC=C1 ZZTCPWRAHWXWCH-UHFFFAOYSA-N 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000000417 fungicide Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920006389 polyphenyl polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- VOZKAJLKRJDJLL-UHFFFAOYSA-N tolylenediamine group Chemical group CC1=C(C=C(C=C1)N)N VOZKAJLKRJDJLL-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
-
- 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
-
- 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
- F16L55/18—Appliances for use in repairing pipes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Polyurethanes Or Polyureas (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The method comprises forming an adherent layer of a plastics foam, especially a rigid polyurethane foam, on a damaged surface using shuttering. In particular, the flexible shuttering 15 covering an internally damaged sewer pipe 11 is moulded to accommodate tiles 19 for facing a rigid polyurethane foam layer produced when a cartridge 25 containing separated foam-forming ingredients is broken inside the shuttered cavity 17. Reinforcement 21 may be incorporated in the foam. <IMAGE>
Description
SPECIFICATION
Method for the repair of damaged surfaces
This invention relates to the repair of damaged surfaces and especially to the repair of damaged sewer pipes.
In its broadest aspect, the present invention provides a method for repairing a damaged surface which comprises arranging shuttering at a distance from the damaged surface, introducing a plastics foam-forming mixture into the space formed between the shuttering and damaged surface, and allowing the mixture to foam and cure.
The shuttering may be any device which supports the formation of a layer of plastics foam in contact with the damaged surface. It may be made of wood or metal, such as aluminium or steel, or of a plastics material, such as a glassreinforced polyester or a polyurethane elastomer.
The shuttering may be arranged and held at a distance from the damaged surface by any convenient means and need only be held in place for as long as it takes the foamed mixture to adhere to the surface and become self-supporting.
The shuttering may be designed to enable facing materials or reinforcements to be applied to the foam layer. For example, shuttering made from a flexible moulded polyurethane elastomer may be provided with retaining members on its internal face for holding ceramic tiles in contact with the foaming mixture.
The distance at which the shuttering is arranged from the damaged surface will be determined by the thickness of the layer of foam required and the nature of any facing materials and reinforcements used.
The plastics foam used in the invention may be any such foam described in the art but is preferably a rigid foam. As suitable plastics foams we would mention unsaturated polyester foams and isocyanate-based foams. These latter foams include polyurethane, polyurea and polyisocyanurate foams and mixtures of these foams. Mixtures of one or more of these foams with other resins are also contemplated in the present invention. An example of these last mentioned mixtures is a mixture of a urethane foam and an unsaturated polyester resin.
Foam-forming mixtures suitable for the production of isocyanate-based foams are weliknown and have been fully described in the prior art. Such mixtures contain an organic polyisocyanate, a blowing agent and optionally other conventional ingredients such as organic polyols, catalysts and surface active agents. To produce a conventional polyurethane foam an organic polyol is usually present in an amount substantially equivalent to the isocyanate.To produce a polyisocyanate foam, the isocyanate is present in an excess amount relative to the polyol and, in fact, the polyol may be completely omitted.
Isocyanurate formation is effected by including an isocyanate polymerisation catalyst. Polyurea foams are formed when a polyisocyanate reacts with water. Carbon dioxide is liberated and acts as a blowing agent. Water may be introduced into a polyurethane mixture to act as blowing agent either alone or together with another conventional blowing agent. The resulting foam will contain both urethane and urea linkages.
Any polyisocyanate described in the art may be used, but in applications where toxic vapours may be a nuisance, for instance, in sewer pipe repairs, it is preferred to use a polymeric diphenylmethane diisocyanate composition (polymeric MDI). These compositions are obtained by the phosgenation of mixtures of amines obtained by the reaction of formaldehyde with aniline in the presence of hydrochloric acid and consist of diphenylmethane 4,4'-diisocyanate in admixture with isomers thereof and with methylene-iinked polyphenyl polyisocyanates containing more than two isocyanate groups.
Polyols suitable for use in the invention are those polyols widely used in formulating rigid polyurethane foams. As examples we mention oxypropylated and oxyethylated hydroxyl and amino compounds such as tolylene diamine, diamino diphenylmethane, glycerol, triethanolamine, sorbitol, sucrose, pentaerythritol, ethylene diamine, diethylene triamine, trimethylolpropane, urea and diethylene glycol.
Other examples are polyesters made from adipic acid or phthalic acid and diethylene glycol, proplyene glycol or glycerol.
Any of the conventional blowing agents, including water, may be used and will normally be present in sufficient quantity to expand the foamforming mixture from 2 to 10 times, and preferably from 3 to 5 times, its original volume.
Other ingredients which may be added to the foam-forming mixture including fillers, for example silicates, borates, especially borax, vermiculite, petite and glass fibres: fire retardants, for example, tris-2-chloroethylphosphate and tris-2chloropropylphosphate: plasticisers, for example, butyl benzyl phthalate, "CELLOSOLVE" (RTM); chlorinated hydrocarbons such as "CEROCLOR" (RTM); surfactants; catalysts, for example, dibutyl tin dilaurate; and fungicides and biocides.
Desirably the foam-forming mixture will have a low viscosity and long cream time so that it will flow into the space between the damaged surface and shuttering and penetrate cracks and other damaged areas of the surface to be repaired.
In addition it will have short cure time to allow the shuttering to be quickly removed and good adhesion to the damaged surface as well as to any reinforcements and facing materials used. Ideally the cured foam will be tough and non-brittle to provided a robust repair.
Polyurethane and polyisocyanurate foams made by a frothing process may be used to advantage in the present invention. This type of process is one in which foaming is due, at least in part, to the vaporisation of a blowing agent, such as dichlorodifluoromethane, by reducing the pressure on the foam-forming mixture. Foams made in this way are fully described in, for example, British Patents Nos. 1 328953 and 1364071. Frothing processes have the advantage that they generate less pressure enabling cheaper, lighter and more flexible shuttering to be used.
Reinforcing materials may be introduced in the foam layer and will conveniently be in mat or roll form and permeable to the foam-forming mixture.
Usefully the mats can expand as the mixture foams so that the reinforcement fills uniformly the damaged areas and space between the shuttering and damaged surface. Suitable mats are continuous filament glass fibre mats and high loft swirl glass fibre mats of the kind used in air filters and for insulation. Incompressible mats may also be used if the foam-forming mixture can flow through them and preferably expand their structure.
Meshed materials, such as wire mesh and integral mesh thermoplastic nets like "NETLON" (RTM) may also be used.
The foam-forming mixture may be introduced into the space between the shuttering and damaged surface by injection using conventional polyurethane dispensing equipment. Alternatively the foam-forming mixture may be prepared within the shuttered space by techniques such as those described in OLS 2123271 and British Patent No.
1476978. The favoured technique is that described in the aforementioned British patent whereby a cartridge containing separated foamforming ingredients is broken at an appropriate moment and the contents mixed so that a foam is formed in situ.
In carrying out the method of the invention the damaged surface will preferably be prepared first by, for example, cleaning with water and brushing to remove loose material. If cartridges carrying the foam-forming ingredients are to be used holes of about 50 mm diameter will be drilled in the damaged surface to accommodate these. Any reinforcing material to be used will be fixed over the damaged surface and the shuttering then arranged at the desired distance from the damaged surface. Conveniently, the cartridges, if used, can be inserted through holes in the shuttering into the holes drilled in the damaged surface. The cartridges are then broken, the ingredients mixed and the holes in the shuttering plugged. Normally, the shuttering will be removed after the mixed ingredients have foamed and the foam so formed has cured.It may, however, be removed as soon as the foam has sufficiently adhered to the damaged surface and has become self-supporting.
The present invention is of particular value for repairing large diameter (6 to 12 ft) sewer pipes which may have cracked or eroded. Replacement of damaged sewer pipes is an expensive and time consuming operation and the present invention provides a relatively cheap and quick alternative.
Other applications for this invention include the repair of tunnels, mine shafts and ventilation shafts.
By way of example only, the invention is further described with reference to the accompanying drawings in which:
Figure 1 is a cross section through a damaged sewer pipe under repair; and
Figure 2 is a detail from Figure 1.
In the drawings, a 12 ft diameter sewer pipe 11 has a damaged inner surface 13. Flexible shuttering 15, supported by means not shown, extends along part of the length of the pipe 11 and is arranged at a distance x from the surface 13 and covers half the inner circumference of the pipe.
The shuttering 15 and surface 11 define therebetween an enclosed space 17. The shuttering is made from a polyurethane cast elastomer and is moulded on its convex surface 18 to accommodate facing tiles 19. A reticulated reinforcing material 21 is placed between the shuttering and damaged surface (see Figure 2).
Drilled holes 23, only one of which is shown, house cartridges 25 which contain separated polyurethane foam-forming ingredients (a polyisocyanate and a polyol blend). A hole 27, in register with the drilled hole 23, passes through the shuttering and between adjacent tiles.
In operation, the cartridge 25 is broken with a rod (not shown) which is passed through the hole 27 and the contents are quickly mixed using the end of the rod. The rod is then withdrawn and the hole 27 plugged. The other cartridges are broken in similar fashion and the associated holes in the shuttering plugged. The mixed ingredients foam in situ and fill the space between the shuttering and inner sewer pipe surface and the damaged areas.
When the foam has cured the shuttering is removed.
The rest of the inner surface of the sewer pipe is repaired in a similar manner. To complete the repair, the new tiled facing layer is grouted.
A suitable foam-forming mixture for use in the process of the invention is prepared by mixing together 180 parts by weight of polymeric MDI
and a polyol blend obtained by mixing together the following ingredients:
parts by
weight a blend of oxypropylated toylenediamine
of hydroxyl value 480 mg kOH/g and
oxypropylated triethanolamine of hydroxyl value 525 mg kOH/g 3.5;
oxypropylated glycerol of hydroxyl value
540 mg kOH/g 21.5;
trichloroproyl phosphate 18.0; oxyethylated/oxypropylated ethylene 4.0;
glycol of hydroxyl value 53 "Silicone L
5340" (obtainable from Union Carbide). 1.0;
a catalyst which is a blend of ethylene
glycol (20 pbw), potassium acetate (20
pbw) and water (1.5 pbw) 1.2;
acetylacetone 0.1; trichlorofluoromethane 25.
The foam-forming mixture may conveniently introduced into a space formed between shuttering and a damaged pipe surface by injection. It has the following reactivity characteristics:
cream time 70 seconds;
string (gel) time 185 seconds;
tack-free time 203 seconds;
end of rise time 225 seconds; and density of foam 44.5 k#jm3 under free-rise conditions.
Claims (5)
1. A method for repairing a damaged surface which comprises arranging shuttering at a distance from the damaged surface, introducing a plastics foam-forming mixture into the space formed between the shuttering and damaged surface, and allowing the mixture to foam and cure.
2. A method as claimed in claim 1 in which the shuttering is made from a flexible moulded polyurethane elastomer and is provided with retaining members for holding ceramic tiles in contact with the foam-forming mixture.
3. A method as claimed in claim 1 or claim 2 in which the foam-forming mixture forms a rigid foam.
4. A method as claimed in claim 3 in which the
rigid foam is a mixture of a urethane foam and an unsaturated polyester resin.
5. A method as claimed in claim 1 substantially as herein described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7930574A GB2032570A (en) | 1978-10-04 | 1979-09-04 | Method for the repair of damaged surfaces |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7839266 | 1978-10-04 | ||
| GB7930574A GB2032570A (en) | 1978-10-04 | 1979-09-04 | Method for the repair of damaged surfaces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2032570A true GB2032570A (en) | 1980-05-08 |
Family
ID=26269068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7930574A Withdrawn GB2032570A (en) | 1978-10-04 | 1979-09-04 | Method for the repair of damaged surfaces |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2032570A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123919A (en) * | 1982-07-16 | 1984-02-08 | Vick Limited Steve | Sealing within pipes |
| FR2614334A1 (en) * | 1987-04-24 | 1988-10-28 | Wasserversorgung Abwasser | PROCESS FOR SANITIZING AND REPAIRING SUBTERRANEAN PIPES, AND NON-SEGREGATIVE CONCRETE FOR IMPLEMENTING SAID METHOD |
| GB2218773A (en) * | 1988-05-17 | 1989-11-22 | Kaeppeli S Soehne Ag A | Lining sewers |
| GB2373830A (en) * | 2001-03-30 | 2002-10-02 | Price Brothers | Method of repairing a prestressed concrete pipe |
| CN101846226A (en) * | 2010-05-26 | 2010-09-29 | 林永志 | Method for restoring lining of large pipeline or ditch by pouring resin on nail-embedded plastic plate |
| CN110656784A (en) * | 2018-07-01 | 2020-01-07 | 南京梅山冶金发展有限公司 | Ore bin repairing method |
| DE102018216235A1 (en) * | 2018-09-24 | 2020-03-26 | KSB SE & Co. KGaA | Use for a collecting shaft |
| CN111156033A (en) * | 2020-01-20 | 2020-05-15 | 北京市市政工程研究院 | Tunnel inverted arch structure repairing method and repairing structure |
-
1979
- 1979-09-04 GB GB7930574A patent/GB2032570A/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123919A (en) * | 1982-07-16 | 1984-02-08 | Vick Limited Steve | Sealing within pipes |
| FR2614334A1 (en) * | 1987-04-24 | 1988-10-28 | Wasserversorgung Abwasser | PROCESS FOR SANITIZING AND REPAIRING SUBTERRANEAN PIPES, AND NON-SEGREGATIVE CONCRETE FOR IMPLEMENTING SAID METHOD |
| GB2218773A (en) * | 1988-05-17 | 1989-11-22 | Kaeppeli S Soehne Ag A | Lining sewers |
| GB2218773B (en) * | 1988-05-17 | 1992-10-21 | Kaeppeli S Soehne Ag A | Process for sealing damaged pipes |
| GB2373830A (en) * | 2001-03-30 | 2002-10-02 | Price Brothers | Method of repairing a prestressed concrete pipe |
| GB2373830B (en) * | 2001-03-30 | 2004-05-26 | Price Brothers | A method of repairing a prestressed concrete pipe |
| CN101846226A (en) * | 2010-05-26 | 2010-09-29 | 林永志 | Method for restoring lining of large pipeline or ditch by pouring resin on nail-embedded plastic plate |
| CN101846226B (en) * | 2010-05-26 | 2011-07-27 | 林永志 | Method for restoring lining of large pipeline or ditch by pouring resin on nail-embedded plastic plate |
| CN110656784A (en) * | 2018-07-01 | 2020-01-07 | 南京梅山冶金发展有限公司 | Ore bin repairing method |
| DE102018216235A1 (en) * | 2018-09-24 | 2020-03-26 | KSB SE & Co. KGaA | Use for a collecting shaft |
| CN111156033A (en) * | 2020-01-20 | 2020-05-15 | 北京市市政工程研究院 | Tunnel inverted arch structure repairing method and repairing structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |