NO170644B - PROCEDURE FOR MANUFACTURING OR RENEWAL OF THE BOTTOM OF TANKS AND CONTAINERS, AND THE BOTTOM OF THE SAME - Google Patents
PROCEDURE FOR MANUFACTURING OR RENEWAL OF THE BOTTOM OF TANKS AND CONTAINERS, AND THE BOTTOM OF THE SAME Download PDFInfo
- Publication number
- NO170644B NO170644B NO902305A NO902305A NO170644B NO 170644 B NO170644 B NO 170644B NO 902305 A NO902305 A NO 902305A NO 902305 A NO902305 A NO 902305A NO 170644 B NO170644 B NO 170644B
- Authority
- NO
- Norway
- Prior art keywords
- concrete
- concrete slab
- tank
- plate
- container
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000004567 concrete Substances 0.000 claims description 41
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 229920006334 epoxy coating Polymers 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims 1
- 238000003860 storage Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009418 renovation Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000012791 sliding layer Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/04—Containers for fluids or gases; Supports therefor mainly of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/02—Wall construction
- B65D90/022—Laminated structures
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Supplying Of Containers To The Packaging Station (AREA)
- Making Paper Articles (AREA)
Description
Oppfinnelsen angår en fremgangsmåte ved fremstilling eller fornyelse av bunnen i tanker og beholdere, særlig tanker og beholdere av stål til lagring av flytende brensler eller kjemikalier, hvor tanken eller beholderen er utført med en tilnærmet horisontal bunnplate og sidevegg eller mantel som er sammenføyet med bunnplaten langs dennes omkrets. Oppfinnelsen angår også en bunn for tanker eller beholdere, særlig tanker og beholdere av stål til lagring av flytende brensler eller kjemikalier. The invention relates to a method for manufacturing or renewing the bottom in tanks and containers, in particular steel tanks and containers for storing liquid fuels or chemicals, where the tank or container is made with an approximately horizontal bottom plate and side wall or mantle which is joined to the bottom plate along its circumference. The invention also relates to a bottom for tanks or containers, in particular steel tanks and containers for storing liquid fuels or chemicals.
Ofte vil det etter lengre tids bruk være nødvendig å renovere tanker og beholdere som er benyttet til lagring av f.eks. flytende brensler eller kjemikalier. Fremfor alt er dette aktuelt ved lagertanker i stål og med tilnærmet horisontale bunnplater i samme materiale. I slike tilfeller vil det ved renoveringen som regel være nødvendig å skifte eller fornye bunnplaten som er tilbøyelig til å korrodere fordi det samler seg kondensvann som blir stående på bunnen av tanken. I samband med en renovering ville det derfor være hensiktsmessig at bunnplaten kunne dekkes eller eventuelt skiftes ut med en bunn av korrosjonsfast materiale som gis en form egnet til oppsam-ling av kondensvannet. En slik bunn kunne være utført i f.eks. rustfritt stål, men utførelsen har vist seg å by på praktiske og økonomiske vansker. Det har i den forbindelse også blitt foreslått å dekke bunnen i tanken med en støpt plate av armert betong som deretter dekkes med et overflatebelegg som er motstandsdyktig overfor det stoff som skal lagres i tanken. Denne løsningen er imidlertid beheftet med den ulempe at bunnen av tanken gir etter når tanken fylles med det stoff som skal lagres, og da betongplaten følger denne ettergivende bevegelse, sprekker den, slik at den og dermed bunnen i tanken blir utett. Often, after prolonged use, it will be necessary to renovate tanks and containers that have been used for storing e.g. liquid fuels or chemicals. Above all, this applies to storage tanks in steel and with nearly horizontal bottom plates in the same material. In such cases, during the renovation, it will usually be necessary to replace or renew the bottom plate, which is prone to corroding because condensation collects and remains at the bottom of the tank. In connection with a renovation, it would therefore be appropriate that the base plate could be covered or possibly replaced with a base made of corrosion-resistant material that is given a shape suitable for collecting the condensed water. Such a bottom could be made in e.g. stainless steel, but the design has proven to present practical and financial difficulties. In this connection, it has also been proposed to cover the bottom of the tank with a cast slab of reinforced concrete which is then covered with a surface coating that is resistant to the substance to be stored in the tank. This solution, however, has the disadvantage that the bottom of the tank gives way when the tank is filled with the material to be stored, and as the concrete slab follows this yielding movement, it cracks, so that it and thus the bottom of the tank become leaky.
Hensikten med den foreliggende oppfinnelse er derfor å utvikle en fremgangsmåte som tillater fornyelse av bunnen ved hjelp av en støpt betongplate som ikke sprekker eller deformeres når tanken fylles. En annen hensikt er å skaffe en bunn som er motstandsdyktig overfor det stoff som skal lagres i tanken. The purpose of the present invention is therefore to develop a method which allows renewal of the bottom by means of a cast concrete slab which does not crack or deform when the tank is filled. Another purpose is to provide a bottom which is resistant to the substance to be stored in the tank.
De ovennevnte hensikter oppnås med en fremgangsmåte som i henhold til oppfinnelsen er.kjennetegnet ved at bunnplaten dekkes ved påstøping av plate av langsomtherdende, i våt tilstand vannfast betong som armeres, at herdingen av betongplaten etter utstøping retarderes eller forsinkes i et gitt tidsrom hvorunder betongplaten gradvis trykkbelastes inntil en fastlagt verdi, idet trykkbelastningen skaffes ved kontrollert innføring av et passende trykkmedium under retardasjonsperioden, at trykkbelastningen holdes på den fastlagte verdi under betongens herdeperiode, at trykkmediet deretter fjernes og , betongplatens overflate eventuelt justeres ved påføring av en toppstøp av betong, hvoretter betongplaten og den eventuelle toppstøp tørkes for endelig å dekkes med et beskyttende overflatebelegg, samt med en bunn som i henhold til oppfinnelsen er kjennetegnet ved at den er utført som en plate av langsomtherdende, armert betong og at betongplaten er herdet under trykk og dekket med et beskyttende overflatebelegg. The above-mentioned purposes are achieved with a method which, according to the invention, is characterized by the fact that the base plate is covered by casting a slab of slow-hardening, wet-state waterproof concrete which is reinforced, that the hardening of the concrete slab after casting is retarded or delayed for a given period of time during which the concrete slab gradually is pressure loaded up to a determined value, the pressure load being obtained by controlled introduction of a suitable pressure medium during the retardation period, that the pressure load is kept at the determined value during the concrete's hardening period, that the pressure medium is then removed and, the surface of the concrete slab possibly adjusted by applying a top cast of concrete, after which the concrete slab and the possible top cast is dried to finally be covered with a protective surface coating, as well as with a bottom which, according to the invention, is characterized by the fact that it is made as a slab of slow-hardening, reinforced concrete and that the concrete slab is hardened under pressure and covered with a protective e surface coating.
Ytterligere trekk og fordeler ved fremgangsmåten samt bunnen i henhold til den foreliggende oppfinnelse fremgår av de vedføyde, uselvstendige krav. Further features and advantages of the method and the base according to the present invention appear from the attached, independent claims.
Oppfinnelsen skal nå forklares nærmere ved et utførelseseksem-pel i tilknytning til tegningen, hvor fig. 1-5 illustrerer de enkelte trinn ved fremgangsmåten samt bunnens oppbygging i form av et skjematisk, diametralt vertikalsnitt gjennom tanken og dens bunn, mens fig. 6 viser et forstørret utsnitt av detaljer på fig. 5. The invention will now be explained in more detail by means of an embodiment in connection with the drawing, where fig. 1-5 illustrate the individual steps in the method as well as the construction of the bottom in the form of a schematic, diametrical vertical section through the tank and its bottom, while fig. 6 shows an enlarged section of details in fig. 5.
Ved støping av bunnen benyttes en langsomtherdende, seig og vannfast spesialbetong. Herdingen av denne betongen er retardert eller forsinket, slik at den først kommer igang etter maksimalt 35-40 timer. Dette oppnås ved bruk av velkjente tilsetningsstoffer for å forsinke eller utsette herdingen. Det vil forøvrig være innlysende for fagfolk at retardasjonstiden bør settes i relasjon til betongplatens, dvs. tankens, størrelse og kan være meget mindre for små tanker. Deretter herder betongen i et tidsrom på fra 1 til 3 uker, fortrinnsvis i løpet av ca. 2 uker. Fig. 1 viser et skjematisk, diametralt vertikalsnitt gjennom bunnen av en tank med den støpte betongplate 2. Betongplaten er her gitt en fallvinkel fra ytterkant mot midtpunkt, slik at den får en konisk form, men overflaten kan også være konkav eller horisontal. Fordelen med en konisk eller konkav overflate er at kondensvann samler seg i for-senkningen og lett kan fjernes. Den ønskede styrke oppnås ved at platen utføres i armert betong. When casting the bottom, a slow-hardening, tough and waterproof special concrete is used. The hardening of this concrete is retarded or delayed, so that it only starts after a maximum of 35-40 hours. This is achieved by the use of well-known additives to delay or delay curing. It will also be obvious to professionals that the deceleration time should be set in relation to the size of the concrete slab, i.e. the tank, and can be much less for small tanks. The concrete then hardens over a period of from 1 to 3 weeks, preferably within approx. Two weeks. Fig. 1 shows a schematic, diametrical vertical section through the bottom of a tank with the cast concrete slab 2. The concrete slab is here given an angle of incidence from the outer edge towards the centre, so that it takes on a conical shape, but the surface can also be concave or horizontal. The advantage of a conical or concave surface is that condensation collects in the recess and can be easily removed. The desired strength is achieved by making the plate in reinforced concrete.
Straks etter utstøping trykkbelastes platen ved at tanken som vist på fig. 2, fylles med et passende medium 3, f.eks. vann. Denne fylling foretas i løpet av retardasjonsperioden, dvs. i løpet av ca. 30-40 timer, slik at bunnen gradvis deformeres etter hvert som bunnplaten lb gir etter under trykket av væsken. VannpåfyIlingen kan f.eks. skje ved hjelp av et perforert rør og til å begynne med, før vannstanden står betraktelig over betongplatens 2 overflate, beskyttes denne mot utvasking av f.eks. en gummimatte. Under fyllingen vil bunnplaten lb og betongplaten 2 gradvis deformeres under tyngden av væsken og betongplaten setter seg langsomt og med tilnærmet jevn sigehastighet i den ønskede form. Væsken eller vannet fylles under retardasjonsperioden til det normale, maksimale lagringsnivå og blir nå stående i tanken mens betongen herder, dvs. i 1-3 uker, fortrinnsvis ca. 2 uker. Deretter tømmes tanken for væske eller vann og det vil nå som regel være nødvendig å justere eller korrigere betongplatens overflate ved påstøping av et tynt topplag 4 i betong, som vist på fig. 3. Samtidig sørges det for at overflaten får den nøyaktige ønskede fallvinkel eller konkavitet. Deretter må betongplaten 2 tørke, en prosess som vanligvis tar ca. 3 uker, hvoretter betongplaten som antydet på fig. 4, påføres et beskyttende belegg 5. Dette belegget skal først og fremst være motstandsdyktig overfor de stoffer som vanligvis lagres i tanken og kan med fordel være et løsningsmiddeltritt epok-sybelegg, f.eks. av typen "Humidur". Immediately after casting, the plate is pressurized by the tank as shown in fig. 2, is filled with a suitable medium 3, e.g. water. This filling is carried out during the deceleration period, i.e. during approx. 30-40 hours, so that the bottom is gradually deformed as the bottom plate lb yields under the pressure of the liquid. The water filling can e.g. happen with the help of a perforated pipe and to begin with, before the water level is considerably above the surface of the concrete slab 2, this is protected against washing out by e.g. a rubber mat. During the filling, the bottom plate 1b and the concrete plate 2 will gradually deform under the weight of the liquid and the concrete plate settles slowly and with an approximately uniform rate of seepage into the desired shape. The liquid or water is filled during the deceleration period to the normal, maximum storage level and is now left in the tank while the concrete hardens, i.e. for 1-3 weeks, preferably approx. Two weeks. The tank is then emptied of liquid or water and it will now usually be necessary to adjust or correct the surface of the concrete slab by pouring on a thin top layer 4 of concrete, as shown in fig. 3. At the same time, it is ensured that the surface gets the exact desired angle of incidence or concavity. The concrete slab 2 must then dry, a process which usually takes approx. 3 weeks, after which the concrete slab as indicated in fig. 4, a protective coating 5 is applied. This coating must primarily be resistant to the substances that are usually stored in the tank and can advantageously be a solvent-resistant epoxy coating, e.g. of the "Humidur" type.
Langs kanten av bunnen i overgangen mellom betongplaten 2 og tankens yttervegg eller mantel la anordnes det til slutt en hulkil 6 eller list. Hulkilen 6 kan f.eks. være utført i form av en gummilist eller med en gummisparkelmasse og dekkes med det samme beskyttende overflatebelegg som er påført betongplaten 2. Epoksybelegget armeres med en fibermatte 7 som anordnes slik at den strekker seg ut over hulkilen 6 under overflatebe-legget 5 til plant anlegg mot henholdsvis bunnen og mantelen. Utførelsen av hulkilen 6 er vist i skjematisk vertikalsnitt på fig. 5 og mer detaljert i et forstørret utsnitt på fig. 6. Along the edge of the bottom in the transition between the concrete slab 2 and the outer wall or mantle of the tank, a hollow wedge 6 or strip is finally arranged. The hollow wedge 6 can e.g. be made in the form of a rubber strip or with a rubber trowel compound and is covered with the same protective surface coating that is applied to the concrete slab 2. The epoxy coating is reinforced with a fiber mat 7 which is arranged so that it extends over the hollow wedge 6 under the surface coating 5 to level against respectively the bottom and the mantle. The design of the hollow wedge 6 is shown in a schematic vertical section in fig. 5 and in more detail in an enlarged section in fig. 6.
Endelig kan hulkilen 6 behandles f.eks. med voks for å danne et glidesjikt 8 mellom hulkil og overflatebelegg. Dette kan være hensiktsmessig for å fange opp en eventuell bevegelse av mantelen i forhold til bunnen når tanken fylles. Finally, the hollow wedge 6 can be treated, e.g. with wax to form a sliding layer 8 between the hollow wedge and the surface coating. This may be appropriate to capture any movement of the mantle in relation to the bottom when the tank is filled.
At bunnen er utført med konkav eller konisk form og har en helt jevn overflate, letter i høy grad arbeidet med rengjøring og vedlikehold av slike tanker. The fact that the bottom is made with a concave or conical shape and has a completely smooth surface greatly facilitates the work of cleaning and maintaining such tanks.
Selv om fremgangsmåten og bunnen i henhold til oppfinnelsen primært er tenkt anvendt ved renovering og fornyelse av bunnen i lagringstanker av den ovennevnte art, er det ingenting i veien for å bygge opp tanker med bunnen utført på den angitte måte fra grunnen av. I et slikt tilfelle er det naturligvis ikke nødvendig med noen bunnplate i tanken, da betongplaten kan støpes med bruk av en passende bunnforskaling. Bunnen må da være innfestet i eller sammenføyet med mantelen, f.eks. ved at denne utføres med en innadrettet, radial flens omkring underkanten. Although the method and the bottom according to the invention are primarily intended to be used for renovating and renewing the bottom in storage tanks of the above-mentioned type, there is nothing in the way of building up tanks with the bottom made in the specified manner from scratch. In such a case, there is of course no need for a bottom plate in the tank, as the concrete plate can be cast using a suitable bottom formwork. The bottom must then be attached to or joined to the mantle, e.g. in that this is carried out with an inwardly directed, radial flange around the lower edge.
Claims (10)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO902305A NO170644C (en) | 1990-05-23 | 1990-05-23 | PROCEDURE FOR MANUFACTURING OR RENEWAL OF THE BOTTOM OF TANKS AND CONTAINERS, AND THE BOTTOM OF THE SAME |
NL9100874A NL9100874A (en) | 1990-05-23 | 1991-05-21 | Renewal method of steel tank bottom - includes casting layer of slow hardening concrete |
SE9101545A SE469641B (en) | 1990-05-23 | 1991-05-22 | METHOD FOR RENOVATING BOTTLES IN TANKS AND CONTAINERS, AND BOTTLES FOR THESE |
DK097191A DK97191A (en) | 1990-05-23 | 1991-05-23 | PROCEDURE FOR RENEWAL OF THE BOTTOM IN TANKS AND CONTAINERS AND BOTH TO THE SAME |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO902305A NO170644C (en) | 1990-05-23 | 1990-05-23 | PROCEDURE FOR MANUFACTURING OR RENEWAL OF THE BOTTOM OF TANKS AND CONTAINERS, AND THE BOTTOM OF THE SAME |
Publications (4)
Publication Number | Publication Date |
---|---|
NO902305D0 NO902305D0 (en) | 1990-05-23 |
NO902305L NO902305L (en) | 1991-11-25 |
NO170644B true NO170644B (en) | 1992-08-03 |
NO170644C NO170644C (en) | 1992-11-11 |
Family
ID=19893206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO902305A NO170644C (en) | 1990-05-23 | 1990-05-23 | PROCEDURE FOR MANUFACTURING OR RENEWAL OF THE BOTTOM OF TANKS AND CONTAINERS, AND THE BOTTOM OF THE SAME |
Country Status (4)
Country | Link |
---|---|
DK (1) | DK97191A (en) |
NL (1) | NL9100874A (en) |
NO (1) | NO170644C (en) |
SE (1) | SE469641B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR9705077C1 (en) * | 1997-10-17 | 2000-11-14 | Petroleo Brasileiro Sa | Method for inversion of the convex configuration of bottoms of storage tanks for liquid products through the application of material with plastic characteristics |
-
1990
- 1990-05-23 NO NO902305A patent/NO170644C/en not_active IP Right Cessation
-
1991
- 1991-05-21 NL NL9100874A patent/NL9100874A/en not_active Application Discontinuation
- 1991-05-22 SE SE9101545A patent/SE469641B/en not_active IP Right Cessation
- 1991-05-23 DK DK097191A patent/DK97191A/en unknown
Also Published As
Publication number | Publication date |
---|---|
SE9101545D0 (en) | 1991-05-22 |
DK97191A (en) | 1991-11-24 |
NO902305D0 (en) | 1990-05-23 |
NO170644C (en) | 1992-11-11 |
DK97191D0 (en) | 1991-05-23 |
NL9100874A (en) | 1991-12-16 |
SE469641B (en) | 1993-08-09 |
NO902305L (en) | 1991-11-25 |
SE9101545L (en) | 1991-11-24 |
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