CN103692095A - Installation and construction method for large-scale single-disc type outer floating top storage tank - Google Patents
Installation and construction method for large-scale single-disc type outer floating top storage tank Download PDFInfo
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- CN103692095A CN103692095A CN201310665792.XA CN201310665792A CN103692095A CN 103692095 A CN103692095 A CN 103692095A CN 201310665792 A CN201310665792 A CN 201310665792A CN 103692095 A CN103692095 A CN 103692095A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
Abstract
The invention discloses an installation and construction method for a large-scale single-disc type outer floating top storage tank. The method sequentially comprises the following steps including a prefabrication processing step, a tank bottom installation step, a tank wall installation step, a floating top installation step and a water flushing test step. The installation and construction method has the beneficial effects that a vehicle entering and existing slope is paved, the entering and the existing of conveying vehicles and cranes are convenient, the time for hanging plates by the cranes is reduced, and the construction work period for paving bottom plates is shortened; the crane directly carries out the hanging operation on the foundation for paving the bottom plates, so the leasing cost is reduced; an automatic welding machine is adopted for welding, so a great amount of labor cost is reduced; the installation of a wall plate and the installation of the floating top are simultaneously carried out, in addition, accessories are penetrated and inserted between the wall plate and the floating top for installation, the construction work period of the whole storage tank is shortened, the quality, the safety and the work period are ensured, higher application values are realized, and meanwhile, obvious social benefits and economic benefits are also realized.
Description
Technical field
The present invention relates to the outer floating roof tank construction method of installation of a kind of large-scale single disc-type, be applicable to manufacture, the installation of the outer floating roof tank of large-scale single disc-type.
Background technology
Along with the high speed development of China's economic, the demand of oil and product oil increases severely.China has become petroleum import big country, and oil has become the important strategic materials of country, and it is directly connected to the economic development of China, social stability and national security, and large-scale vertical steel storage tank is the very important warehousing and transportation facilities of petroleum chemical industry.The construction of Chinese large-sized storage tank has at present entered a new high-speed development period.
Therefore, the process that Large Oil Tank is built, has decisive significance to oil tank quality safety and duration.
Summary of the invention
The invention provides the outer floating roof tank construction method of installation of a kind of large-scale single disc-type.
The technical solution used in the present invention is:
The outer floating roof tank construction method of installation of large-scale single disc-type, in turn includes the following steps: installation steps, tank skin installation steps, floating roof installation steps and Hose Test step at the bottom of prefabricated procedure of processing, tank,
At the bottom of described tank, installation steps are: on tank base, mark center line and base plate outward flange circumference, by typesetting, figure lays base plate;
Described tank skin installation steps are: at the inside and outside two circle baffle plates of bottom edge wooden partition Board position welding, assembling first lap wallboard also supports fixing with diagonal brace, vertical seam is with adopting electro-gas (enclosed) welding to weld behind fixture location, inner tripod suspension platform is installed, as job platform, the vertical seam of assembling second section wallboard welding, adopts the horizontal position welding of automatic submerged arc horizontal welding welding first segment wallboard; Inner tripod suspension platform is installed on second section wallboard, is installed and respectively save wallboard successively;
Described floating roof installation steps are: floating roof is constructed on the stand of temporarily setting up, and floating roof all adopts manual electric arc welding welding.
Described prefabricated procedure of processing comprises the prefabricated of base plate, wallboard, floating roof and annex.
At the bottom of described tank, in installation steps, carry out the line of tank bottom pad plate, margin plate and center plate, take base center standard as benchmark, draw center line, then determine margin plate outward flange assembling radius R t:Rt=(R+na/2 π)/cos θ,
In formula: the horizontal radius in R-side plate edge; Every weld shrinkage of a-; The quantity of n-arcuate edge listrium; θ-basic gradient angle.
The outer arc radius of described margin plate is pressed the 0.1%-0.15% of Enlargement Design radius, described backing plate length direction should be less than 3mm with margin plate edge nonparallelism, range deviation between the center line of described backing plate length direction and base plate butt weld length direction center line is less than 3mm, and described center plate welding adopts C0
2the broken silk of gas shielded arc welding and submerged arc is filled weldering.
In described tank skin installation steps, determining that wallboard is installed along the oblique internal diameter of unwrapping wire at the bottom of tank is: R group=(in R+and R ')/COS α,
In formula: in R-Oil Tank Design inside radius; The alpha-oil tank base gradient; The amount of contraction of R '-oil tank wallboard postwelding radial direction; R '=ma/2 π; Every weld shrinkage of a-; The vertical seam sum of m-oil tank wallboard.
The longitudinal seam that respectively encloses wallboard during described wallboard row plate is to the same direction from coil to coil 1/4-1/3 that staggers.
In described floating roof installation steps, floating roof assembling procedure flow process is: interim pallet is set up, floating roof base plate assembly welding, floating roof ring flat-plate assembly welding, truss assembling welding, floating roof dividing plate assembly welding, floating roof top board assembly welding and column and column backing plate assembly welding.
Described Hose Test step detailed process is: while certainly starting to wash by water to 600mm, stop bath tank bottom is carried out to lysimetric test, ne-leakage is gone up water to floating roof and is just floated, and stops bath cabin is carried out to lysimetric test, qualified rear bath to 1/2 liquid level, stop bath observation one day, bath, to 3/4 liquid level, stops bath observation one day, bath to the highest liquid level of design keeps 48 hours, waterproof after observation meets the requirements, controls the speed that discharges water while discharging water, liquid level declines and is no more than 3m every day.
Before described base plate is installed, build in advance wide vehicles while passing ramp, 4 meters, a place outside ringwall, outside ringwall, ramp adopts the earthwork to build, topping laying aggregate chips, and with sleeper, exceeding ringwall laying by ringwall place.
When described center plate is laid, to reach basis upper for truck crane, the supporting leg position of crane on mounted center plate, each supporting leg underlay two block length sleeper.
The invention has the beneficial effects as follows: lay vehicles while passing ramp, facilitate the turnover of haulage vehicle and crane, saved the time of crane boatswain chair, shorten the base plate paving construction period; Crane is lifting operation laying base plate on basis directly, has saved lease expenses; Adopt automatic welder(welding machine) to weld, saved a large amount of labour costs; Wallboard and floating roof are installed and are carried out simultaneously, and intert betwixt annex and install, and have shortened the construction duration of whole storage tank, in quality, safety and be guaranteed on the duration, have higher using value, also have obvious Social benefit and economic benefit simultaneously.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the outer ramp of ringwall of the present invention schematic diagram.
Fig. 2 is the A-A cutaway view of Fig. 1 of the present invention.
Fig. 3 be at the bottom of tank of the present invention bed board structural representation.
Fig. 4 is the structural representation of margin plate group of the present invention.
Fig. 5 is spot welding mode schematic diagram of the present invention.
Fig. 6 is base plate center plate welding sequence schematic diagram of the present invention.
Fig. 7 is that wallboard of the present invention is installed along the oblique internal diameter schematic diagram of unwrapping wire at the bottom of tank.
Fig. 8 is first segment tank shell scheme of installation of the present invention.
Wherein: 1, ramp, 2, terrace, 3, tank base, 4, ringwall, 5, margin plate, 6, backing plate I, 7, adjust plate, 8, gap, 9, center plate, 10, spot welding place, 11, wallboard, 12, base plate, 13, adjusting lever, 14, backing plate II, 15, baffle plate.
The specific embodiment
As shown in Fig. 1-8, the outer floating roof tank construction method of installation of large-scale single disc-type of the present invention, in turn includes the following steps: installation steps, tank skin installation steps, floating roof installation steps and Hose Test step at the bottom of prefabricated procedure of processing, tank.
Prefabricated procedure of processing comprises the prefabricated of base plate, wallboard, floating roof and annex, sets up interim precast plant near at the construction field (site), the various construction machinery equipments of reasonable Arrangement in precast plant, and the power supply that Party A is provided, water source are introduced in construction precast plant.
At the bottom of described tank, installation steps are: on tank base, mark center line and base plate outward flange circumference, by typesetting, figure lays base plate, before described base plate is installed, outside ringwall, build in advance wide vehicles while passing ramp, 4 meters, a place, the outer ramp of ringwall adopts a cubic metre of earth build, topping laying aggregate chips, and exceeding ringwall laying by ringwall place with sleeper, prevent from damaging ringwall (as illustrated in fig. 1 and 2).
Because tank diameter is large, at the bottom of individual tank, the weight of center plate is approximately 4 tons, and when at the bottom of tank, center plate is laid, 25T truck crane need reach on basis, the supporting leg position of crane, should be chosen on mounted center plate, each supporting leg underlay two block length sleeper, to avoid damaging by pressure the asphaltic sands of surface of base.
Basis inspect for acceptance qualified after, carry out the line of tank bottom pad plate, margin plate and center plate, take base center standard as benchmark, draw center line, determine again margin plate outward flange assembling radius R t:Rt=(R+na/2 π)/cos θ, in formula: the horizontal radius in R-side plate edge; Every weld shrinkage of a-; The quantity of n-arcuate edge listrium; θ-basic gradient angle (as shown in Figure 3).
Take base center and four azimuth marks is benchmark, the center line of crossing, by typesetting figure, carry out tank bottom pad plate (comprising bottom edge board and center plate) unwrapping wire, the 0.1%-0.15% that the outer arc radius of margin plate is pressed Enlargement Design radius determines, carry out cutting stock moulding, after the tank bottom pad plates such as base plate unwrapping wire have welded, carry out.
Centered by base center, take Rt as radius, according to material cutting plan, mark each assembly line of bottom edge board, along scribing position, lay backing plate, backing plate is sequentially laid.Backing plate length direction should be parallel with margin plate edge, and nonparallelism should be less than 3mm, and the range deviation between the center line of backing plate length direction and tank bottom butt weld length direction center line should be less than 3mm, and the laying of backing plate should leave enough survivors of a murder attempt.
When margin plate is laid, from a certain orientation, to both sides, position laying, to guarantee the accuracy of bed board position.Margin plate is adjusted plate and is finally installed, and by actual conditions, cuts away unnecessary part.During laying, must assurance group to large outer little feature (outer side clearance is 6-8mm, and interior side clearance is 8-12mm) in gap, (as shown in Figure 4) fixed with combined clamp appts in laying limit, limit.
Center plate is laid and should be laid by the order from middle toward surrounding.The group opposite side spot welding of center plate limit, during spot welding, base plate and backing plate will be close to, and clearance control is below 1mm; Spot welding mode adopts the method every 200mm weldering 50mm, during spot welding, be necessarily noted that the long limit of a spot welding (end, long limit is about not spot welding of 300-500mm), and only allow spot welding on one side, minor face must not spot welding, and point this plate present position of postwelding will be consistent (as shown in Figure 5) with typesetting figure.
When base plate and wallboard T angle welding have all been welded, get final product group to whole shrinkage joints, after shrinkage joint has welded, first rule with semi auto cutting machine the unnecessary Partial Resection of center plate, again by the reserved weld seam in special-shaped center plate end and center plate with together with tortoise plastron seam between margin plate, organize rightly, the assembling of base plate all completes.
The welding of margin plate adopts SMAW, and all welders must be uniformly distributed, and according to same direction, welds simultaneously, guarantees margin plate welding contraction evenly; Center plate welding adopts C0
2the broken silk of gas shielded arc welding+submerged arc is filled weldering; Tortoise plastron seam welding adopts the broken silk of SMAW back cover+submerged arc to fill weldering, before first lap wallboard is installed, first carries out the welding of 300mm weld seam outside margin plate; At the bottom of tank, center plate welding, first welds short seam, rear weldering slit, and the long weld seam You Guan of center plate center weld seam starts to both sides, to weld successively, thus pre-anti-welding deformation guarantees welding quality (as shown in Figure 6).
Tank skin installation steps are: at the inside and outside two circle baffle plates of bottom edge wooden partition Board position welding, assembling first lap wallboard also supports fixing with diagonal brace, vertical seam is with adopting electro-gas (enclosed) welding to weld behind fixture location, inner tripod suspension platform is installed, as job platform, the vertical seam of assembling second section wallboard welding, adopts the horizontal position welding of automatic submerged arc horizontal welding welding first segment wallboard; Inner tripod suspension platform is installed on second section wallboard, is installed and respectively save wallboard successively.
Determining that wallboard is installed along the oblique internal diameter of unwrapping wire at the bottom of tank is: R group=(in R+and R ')/COS α, in formula: in R-Oil Tank Design inside radius; The alpha-oil tank base gradient; The amount of contraction of R '-oil tank wallboard postwelding radial direction; R '=ma/2 π; Every weld shrinkage of a-; The vertical seam sum of m-oil tank wallboard (as shown in Figure 7).
Tank bottom has been assembled, outside bottom edge board butt weld, 300mm has all welded, and it is qualified to detect a flaw, on margin plate, mark and install after radius, according to tank skin material cutting plan, on circumference, mark the installation site of every plate of first segment wallboard, and check whether the position of opening on first lap wallboard meets design drawing and code requirement.
Along assembling garden electric welding assembling baffle plate, according to typesetting figure and anti-line position, adopt 25t truck crane and use hanging beam to carry out the lifting of wallboard, first from turnover oil pipe oralia, start to install, along arrange one by one counterclockwise or clockwise (also can install along both direction) simultaneously, first plate adds two adjusting levers in inner side, every plate adds an adjusting lever later, between adjacent two plates, with vertical seam fixture, connect, to found gap, levelness suitable for reading, the coarse adjustment of radian and misalignment etc., after wallboard has been assembled, by first adjusting ovality, adjust again levelness suitable for reading, finally adjust the order of perpendicularity and adjust three degree.Ovality: adjust with sub, the vertical seam fixture of assembling baffle plate and square cotter.Levelness: with square cotter or jack adjustment, perpendicularity: adjust with adjusting lever and vertical seam fixture, after first segment wallboard vertical welding, should again to three degree, check adjustment, the benchmark of usining as second layer wallboard assembling, check ovality arc plate, check steel tape and spirit level for levelness suitable for reading, check perpendicularity plumb bob.
After being arranged on lower floor's wallboard passed examination of having welded, second section to the eight joint wallboards carry out.Every joint wallboard erection sequence is: before assembling the second band plate, on the first band plate, set up the inner tripod suspension platform of a circle as job platform, for the second band assembly welding, use; After treating that the second band plate has welded, tripod suspension platform is placed on the second band plate; Each layer loops later.Setting up inclined ladder near tank manhole place, for the upper and lower job platform of operating personnel, when construct, floating roof by the inclined ladder dismounting below top, is arranged in floating roof.Each group of enclosing wallboard, to for improving work efficiency, reduces work high above the ground, convenient installation, and other group of respectively enclosing wallboard, to front, should be welded on tank skin inwall the jig on wallboard in advance.
Vertical seam group is to carrying out from inner side, and group is 5mm to gap, and group is to the E template of burn-oning after good; The welding method that all vertical seams all adopt manual electric arc welding and electro-gas (enclosed) welding to combine; The about 300mm in first segment wallboard longitudinal joint bottom adopts manual welding, and all the other respectively save the about 50mm in wallboard longitudinal joint bottom and adopt manual welding.Front first two arc-extinguishing plates of spot welding on wallboard top of weldering.First and second circle vertical welding moulding at twice, first welds outside, rear weldering inner side, and two welding machines are symmetrical, weld from bottom to top in the same direction.
In described floating roof installation steps, floating roof assembling procedure flow process is: interim pallet is set up, floating roof base plate assembly welding, floating roof ring flat-plate assembly welding, truss assembling welding, floating roof dividing plate assembly welding, floating roof top board assembly welding and column and column backing plate assembly welding, floating roof is constructed on the stand of temporarily setting up, and floating roof all adopts manual electric arc welding welding;
Floating roof is assembled on floating roof falsework carries out.At the bottom of tank, according to support figure, mark the position of falsework column, the position of column is avoided the position of pontoon pillar as far as possible; The assembling of falsework therefrom mind-set surrounding is carried out, and mid portion adopts diamond-mesh to arrange, and adjacent stent connects to form triangle by crossbeam.Marginal portion is assembled ring support one along the inside 300mm of tank skin, and ring support is connected with mid portion support with angle steel; Adjust falsework, make its cabin supporting surface in same plane; The aspect ratio cabin base plate of falsework formally highly increases 150mm.
According to material cutting plan and designing requirement mounting edge buoyancy module, lay floating roof plate, therefrom mind-set surrounding is laid, and spot welding is carried out on laying limit, limit; Welding sequence at the bottom of floating roof welding sequence reference can; The weld seam of floating roof plate is soldered, and vacuum leakage test and kerosene leak test are complete, and central buoyancy module plate is installed, and welds in time the weld seam of overhead welding part when top board is laid, and reduces the weld job in the rear cabin of sealing.The laying order of central authorities' buoyancy module top board is with floating roof plate.
Top annex comprises cabin manhole, pillar, catch pit, vent valve, the gauging mouth of pipe, breather valve, floating terraced track, scrape the compositions such as cured scene, sealing system, floating roof manhole and central drain, prefabricated annex outside tank, after floating roof is soldered, the position of first demarcating according to drawing is measured, unwrapping wire, mark the installation site line of each annex, the cabin manhole of sailing, then to scribing position on regional contrast floating roof top board.Accurately determine pillar sleeve, catch pit, the position of floating roof manhole, vent valve, the gauging mouth of pipe, breather valve, floating roof track etc., carries out above-mentioned every perforate after determining, installs and welding.After welding, by designing requirement, carry out passed examination, then the installation of scraping the annexes such as lap sealant, and the installation of floating roof central drain and welding.
When floating roof column is installed, first adjust its height.By its design height, reserve 200mm adjustment amount, during installation, by many people, carried out simultaneously, available interim pallet adjustable nut is adjusted, mounting column, is fixed on sleeve pipe with pin, after every root post is all installed, it is dismountable floating roof pallet, and derived from manhole, pallet can carry out installation and the welding of each annex of floating roof bottom surface after removing.
The adjustment again of support leg is when filling water test, then carries out in the process that discharges water.Its method of adjustment is to discharge water to stop discharging water when position exceeds 300mm at the end to water table ratio floating roof is, adjusts the actual needs length of each column.
Top angle, winding staircase and platform, floating ladder, dipping tube and platform, these members are prefabricated on platform.Winding staircase divides two sections of installations, winding staircase platform and integrally is installed, and dipping tube platform and integrally is installed, and floating ladder is prefabricated into two sections, wherein one section reserves 300mm adjustment amount, after the track in dipping tube platform and floating roof installs, survey its size, then rotative ladder group to getting up, during prefabricated floating ladder, noted camber, group is to rear, and floating terraced integral hoisting, notes preventing bending and distortion during lifting.
The tripod of winding staircase and platform, backing plate, by figure paper size, along with the installation of tank skin, install, and weld perfect.When winding staircase is installed, with the crane first paragraph of slinging, be placed on centering location on tripod, be welded and fixed.After hypomere winding staircase is installed, the halfpace of winding staircase is installed, and the handrail of winding staircase halfpace, railing etc. are installed and welded.Tank skin top angle is installed and has been welded.
Dipping tube installation requirement position is accurate, coordinates appropriately with wind girder hole, connects reliable.Dipping tube upper brace installs, lower support location.After the on-the-spot installation of guiding, carry out the installation of dipping tube, dipping tube is prefabricated into integral body, notices that its glacing flatness must reach requirement, notices that its perpendicularity reaches standard-required during installation.
Described Hose Test step detailed process is: while certainly starting to wash by water to 600mm, stop bath tank bottom is carried out to lysimetric test, ne-leakage is gone up water to floating roof and is just floated, and stops bath cabin is carried out to lysimetric test, qualified rear bath to 1/2 liquid level, stop bath observation one day, bath, to 3/4 liquid level, stops bath observation one day, bath to the highest liquid level of design keeps 48 hours, waterproof after observation meets the requirements, controls the speed that discharges water while discharging water, liquid level declines and is no more than 3m every day.
Lay vehicles while passing ramp, facilitate the turnover of haulage vehicle and crane, saved the time of crane boatswain chair, shorten the base plate paving construction period; Crane is lifting operation laying base plate on basis directly, has saved lease expenses; Adopt automatic welder(welding machine) to weld, saved a large amount of labour costs; Wallboard and floating roof are installed and are carried out simultaneously, and intert betwixt annex and install, and have shortened the construction duration of whole storage tank, in quality, safety and be guaranteed on the duration, have higher using value, also have obvious Social benefit and economic benefit simultaneously.
Claims (10)
1. the outer floating roof tank construction method of installation of large-scale single disc-type, is characterized in that: in turn include the following steps: installation steps, tank skin installation steps, floating roof installation steps and Hose Test step at the bottom of prefabricated procedure of processing, tank,
At the bottom of described tank, installation steps are: on tank base, mark center line and base plate outward flange circumference, by typesetting, figure lays base plate;
Described tank skin installation steps are: at the inside and outside two circle baffle plates of bottom edge wooden partition Board position welding, assembling first lap wallboard also supports fixing with diagonal brace, vertical seam is with adopting electro-gas (enclosed) welding to weld behind fixture location, inner tripod suspension platform is installed, as job platform, the vertical seam of assembling second section wallboard welding, adopts the horizontal position welding of automatic submerged arc horizontal welding welding first segment wallboard; Inner tripod suspension platform is installed on second section wallboard, is installed and respectively save wallboard successively;
Described floating roof installation steps are: floating roof is constructed on the stand of temporarily setting up, and floating roof all adopts manual electric arc welding welding.
2. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 1, is characterized in that: described prefabricated procedure of processing comprises the prefabricated of base plate, wallboard, floating roof and annex.
3. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 1, it is characterized in that: at the bottom of described tank, in installation steps, carry out the line of tank bottom pad plate, margin plate and center plate, take base center standard as benchmark, draw center line, determine again margin plate outward flange assembling radius R t:Rt=(R+na/2 π)/cos θ
In formula: the horizontal radius in R-side plate edge; Every weld shrinkage of a-; The quantity of n-arcuate edge listrium; θ-basic gradient angle.
4. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 3, it is characterized in that: the outer arc radius of described margin plate is by the 0.1%-0.15% of Enlargement Design radius, described backing plate length direction should be less than 3mm with margin plate edge nonparallelism, range deviation between the center line of described backing plate length direction and base plate butt weld length direction center line is less than 3mm, and described center plate welding adopts C0
2the broken silk of gas shielded arc welding and submerged arc is filled weldering.
5. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 1, is characterized in that: in described tank skin installation steps, determining that wallboard is installed along the oblique internal diameter of unwrapping wire at the bottom of tank is: R group=(in R+and R ')/COS α,
In formula: in R-Oil Tank Design inside radius; The alpha-oil tank base gradient; The amount of contraction of R '-oil tank wallboard postwelding radial direction; R '=ma/2 π; Every weld shrinkage of a-; The vertical seam sum of m-oil tank wallboard.
6. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 5, is characterized in that: the longitudinal seam that respectively encloses wallboard during described wallboard row plate is to the same direction from coil to coil 1/4-1/3 that staggers.
7. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 1, is characterized in that: in described floating roof installation steps, floating roof assembling procedure flow process is: interim pallet is set up, floating roof base plate assembly welding, floating roof ring flat-plate assembly welding, truss assembling welding, floating roof dividing plate assembly welding, floating roof top board assembly welding and column and column backing plate assembly welding.
8. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 1, it is characterized in that: described Hose Test step detailed process is: while certainly starting to wash by water to 600mm, stop bath tank bottom is carried out to lysimetric test, ne-leakage is gone up water to floating roof and is just floated, stop bath cabin is carried out to lysimetric test, qualified rear bath to 1/2 liquid level, stop bath observation one day, bath to 3/4 liquid level, stop bath observation one day, bath to the highest liquid level of design keeps 48 hours, waterproof after observation meets the requirements, while discharging water, control the speed that discharges water, liquid level declines and is no more than 3m every day.
9. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 8, it is characterized in that: before described base plate is installed, outside ringwall, build in advance wide vehicles while passing ramp, 4 meters, a place, the outer ramp of ringwall adopts a cubic metre of earth build, topping laying aggregate chips, and with sleeper, exceeding ringwall laying by ringwall place.
10. the outer floating roof tank construction method of installation of large-scale single disc-type according to claim 3, is characterized in that: when described center plate is laid, to reach basis upper for truck crane, the supporting leg position of crane on mounted center plate, each supporting leg underlay two block length sleeper.
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| CN108930441A (en) * | 2017-05-26 | 2018-12-04 | 五冶集团上海有限公司 | Large-size stainless steel groove tank siding installation method under hot environment |
| CN108931386A (en) * | 2017-05-27 | 2018-12-04 | 五冶集团上海有限公司 | Large-size stainless steel groove tank filling water test method under hot environment |
| CN109214018A (en) * | 2017-07-03 | 2019-01-15 | 中国石油化工股份有限公司 | A kind of tank designs method and device |
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