CN101972897B - Tank top installing and welding process of single-coating double-wall low temperature storage tank - Google Patents

Tank top installing and welding process of single-coating double-wall low temperature storage tank Download PDF

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Publication number
CN101972897B
CN101972897B CN 201010257199 CN201010257199A CN101972897B CN 101972897 B CN101972897 B CN 101972897B CN 201010257199 CN201010257199 CN 201010257199 CN 201010257199 A CN201010257199 A CN 201010257199A CN 101972897 B CN101972897 B CN 101972897B
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China
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welding
tank
outer tank
tank deck
temperature storage
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CN101972897A (en
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贺贵仁
杨开宇
黄永利
郑文仁
向东
许鹏鹰
林新涛
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China Petroleum and Chemical Corp
Sinopec Ningbo Engineering Co Ltd
Sinopec Ningbo Technology Research Institute
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China Petroleum and Chemical Corp
Sinopec Ningbo Engineering Co Ltd
Sinopec Ningbo Technology Research Institute
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Abstract

The invention relates to a tank top installing and welding process of a single-coating double-wall low temperature storage tank, which is characterized by comprising the following steps of: (1) installing temporary buttresses on an outer tank base plate and on an outer tank wall, installing and welding pressure bearing rods on the temporary buttresses, and building a full scaffold in the outer tank of the low temperature storage tank; (2) welding a net rack on the outer tank top; (3) welding top plate: welding each top plate on the net rack; (4) installing each suspension rod on each corresponding H-shaped steel, and removing the internal full scaffold; (5) installing and welding an inner tank suspended ceiling on the outer tank base plate; (6) lifting the welded inner tank suspended ceiling by using a leading chain, and connecting with each suspension rod; and (7) welding compression resisting rings: installing and welding the compression resisting rings at the junctions of the pressure bearing rods and the top plates of the outer tank top. Compared with the prior art, the process only requires building the full scaffold once and has the advantages of fewer temporary tooling quantity, low construction difficulty, simple construction procedures, capability of ensuring working safety, high construction quality and construction efficiency and low construction cost.

Description

A kind of single tank deck assembly welding technique that contains the double-walled low-temperature storage tank
Technical field
The present invention relates to a kind of single tank deck assembly welding technique that contains the double-walled low-temperature storage tank.
Background technology
Single double-walled furred ceiling low-temperature storage tank that contains is mainly used in liquefaction hydrocarbon gas such as splendid attire methane, ethane, ethene, propylene.The sectional structure sketch map of single containing double-walled furred ceiling low-temperature storage tank is as shown in Figure 1, and low-temperature storage tank comprises interior jar and outer jar, and said interior jar is positioned within outer jar.Certain at interval distance between interior jar perisporium and the outer jar perisporium is filled with cold insulation material formation cold insulation layer in the space between the two; An interior jar furred ceiling is tabular, the upper end of jar perisporium in being welded on; Cryogenic liquid is stored in interior jar that furred ceiling constituted by interior jar of perisporium, interior jar of bottom surface and interior jar; An interior jar design temperature is generally-20~-168 ℃, and design pressure is less than 0.1Mpa; An interior jar perisporium adopts the preparation of Ni5 steel usually, and interior jar of furred ceiling adopts aluminum alloy materials usually.An interior jar furred ceiling directly is suspended in the outer tank deck through pull bar, so the furred ceiling construction also is the pith of outer tank deck construction.Interior jar furred ceiling mainly plays the effect that isolated cryogenic media contacts with atmosphere, uses material to be generally low-temperature steel or aluminium sheet.
Outer jar comprises outer jar perisporium and outer tank deck.Outer jar does not contact cryogenic liquid, but will carry pressure and wind load between interior jar gas and the steam, supports being filled in the cold insulation layer between inside and outside tank skin simultaneously; In order to guarantee the cold insulation effect, the outer tank material of such low-temperature storage tank generally adopts Q345R.Outer tank deck is domes, and it comprises arch grid structure and is welded on the top board on the rack; Said arch grid structure by many arcuation H shaped steel, be positioned at the central ring flat-plate at outer tank deck top and form with many annular fixed heads that central ring flat-plate parallels; Wherein, the two ends of arcuation H shaped steel are welded on respectively between pressure-bearing bar and the central top board; Described pressure-bearing bar is seated on the end face of outer tank skin top.Also be welded with many suspension rods between outer tank deck and interior jar of furred ceiling, a jar furred ceiling was suspended on the connection effect on the outer tank deck in suspension rod mainly played.Simultaneously the pressure-bearing bar with outside also need weld compression ring on the hoop perisporium that engages of tank deck.In the vault tank designs; Tank deck and tank skin junction belong to discontinuous construction; But this place but is one of outer jar of stressed key area, and the zone that will connect tank deck and tank skin usually is called the compressional zone, therefore resists the circumferential compression stress in this zone through the welding compression ring; And compression ring is because the position is special, material is thick, quality requirement is high, and difficulty of construction is big many in other position relatively.And outer jar of compressional zone assembly welding quality of low-temperature storage tank must meet correlation technique, the quality requirement of API620 " large-scale welding low pressure storage tank design and construction " standard.
Because storage tank tank deck complex structure, tonnage is heavy, and difficulty of construction is big, with 30,000 m 3Low-temperature storage tank is an example, about 600 tons of outer jar gross weight, and tank deck weight can reach 200 tons.And the outer jar of single containing double-walled low-temperature storage tank is thinner owing to tank skin, and about 15mm, tank deck adopts the air blow off technology construction of formal dress usually; Not only welding procedure is loaded down with trivial details; And scaffold to take the amount of tearing open big, be difficult to implement automatic welding process in the welding process, cost has high input.Adopt conventional hydraulic pressure lift inverted construction technology, when tank deck H shaped steel, tank deck compression ring, tank deck plate are installed, all need outside jar inside and outside full hall scaffold of setting up, the work high above the ground time is long, and potential safety hazard is big, long in time limit, less economical; Wherein the welding of compression ring must be welded positive weld seam by the first weld seam that welds the back side again; Working space is narrow, has the welding dead angle, and the polishing back chipping is difficult to thoroughly; Welding deformation is difficult to control, the tooled joint group is low to difficulty, efficiency of construction, and is very high to welder's technical ability requirement; Before interior jar of furred ceiling construction, must elder generation remove inner full hall frame simultaneously, jar is set up firmly at the end outside, furred ceiling supports mold temporarily reliably, the welding of jar furred ceiling in carrying out.In jar furred ceiling to rely on after installing bottle gouard moved by hands more than 100 to be promoted to that 6m is above to be connected with suspension rod at least, need this moment secondary to set up full scaffold and regulate the purpose that length of boom reaches assurance furred ceiling installation levelness one by one.The interim mold material of this process requirements is many, quantities is big, work efficiency is low, operating personnel's labour intensity is very big.Tank deck need promote a joint wallboard height bottom wallboard is installed again, and tank deck stability and wind resistance loading capability are poor, and potential safety hazard is big.
In a word, existing single to contain double-walled furred ceiling low-temperature storage tank tank deck assembly welding technique difficulty of construction big, long in time limit, and cost has high input, and be unfavorable for the Comprehensive Control of engineering safety, quality, cost.
Summary of the invention
Technical problem to be solved by this invention is the tank deck assembly welding technique that a kind of single containing double-walled low-temperature storage tank is provided to the present situation of prior art; This technology only need be set up once full hall scaffold; Casual labour's loading amount is few; Difficulty of construction is low, and working procedure is simple, thereby reaches the purpose that guarantees job safety, improves construction quality and efficiency of construction.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: this list contains the tank deck assembly welding technique of double-walled low-temperature storage tank, it is characterized in that comprising the steps:
1. weld the pressure-bearing bar: after the outer tank bottom of low-temperature storage tank, outer tank skin temporary rest pier install, on this temporary rest pier, accomplish the assembly welding of pressure-bearing bar earlier, in outer jar of this low-temperature storage tank, set up the full hall scaffold of umbrella then; Full hall scaffold is that the installation of H steel, welding, quality examination and the installation of furred ceiling suspension rod provide job platform, reduces the security risk of high-rise working greatly;
2. the outer tank deck rack of welding: the two ends that will constitute many arcuation H shaped steel of outer tank deck are welded to respectively on central top board and the said pressure-bearing bar, all arc H shaped steel weld finish after, the angle steel hoop of annular is welded on these H shaped steel; Wherein, described central top board is positioned at the center at said outer tank deck top; H shaped steel after welding finishes, annular angle steel and central ring flat-plate constitute the rack of said outer tank deck;
3. weld outer tank deck top board: tank deck plate outside each circle of welding on said rack; Said outer tank deck is an arcuation dome-type structure; No formal labour protection in the construction; All weld seams are full weld; The welding job amount is big, and the job position conversion is frequent, therefore the welding of outer tank deck top board can through interim hanger, nonslip tread are installed, be provided with the hoop safety rope and temporarily hanging ladder satisfy construction requirement;
4. each suspension rod is installed on each corresponding H shaped steel, removes full hall scaffold.So far the above workload of full hall scaffold is all accomplished, and once mounting is in place; Procedure arrangement is compact, and efficient is high.
5. the assembly welding of jar furred ceiling in outside said, carrying out on the tank bottom; The furred ceiling assembly welding directly carries out on the tank bottom outside, takes certain quarantine measures between outer tank bottom and the furred ceiling, for example uses cheap fire prevention asbestos cloth at a distance from outside between tank bottom and the interior jar furred ceiling; Adopt this method no longer need set up the support mold temporarily, utilize the levelness at jar end can guarantee the levelness that furred ceiling is installed simultaneously.
6. the interior jar of furred ceiling that welding is finished promotes with leading chain, is connected with described each suspension rod; This moment, tank deck residing aspect ratio common process reduced greatly, so the hoisting depth of furred ceiling is less than 200mm, only needed interim mounting portion jack to promote to put in place to be connected with suspension rod by the zone and got final product; Then need jack be installed at every suspension rod place in the existing technology, interior jar of furred ceiling need rise to the above height of 6m; Construction technology security provided by the present invention improves labour intensity greatly and then reduces greatly.
7. weld compression ring: said pressure-bearing bar and said outside the intersection assembly welding compression ring of tank deck plate.Outer tank deck compression ring assembly welding is outside installing two joints, to carry out behind the tank shell, can avoid top board and hydraulic lifting apparatus to collide so on the one hand, can reduce operation height as much as possible on the other hand.
Preferably, the welding of said outer tank deck compression ring can rise to the position apart from pressure-bearing bar upper surface 200~400mm with compression ring, and the first positive weld seam of welding compression ring after welding finishes, welds the weld seam at the compression ring back side again after compression ring promoted a little.This welding method has been avoided the welding dead angle, and welding quality is easy to guarantee that the welding difficulty is low.Through adjustment compression ring welding sequence, weldering earlier is positive, raises temporarily again and carries out back gouging, weld job, has increased working space, has reduced the compression ring difficulty of construction, and quality guarantees easily.
After the tank deck assembly welding finishes outside, can directly weld together in the bottom of said pressure-bearing rod outer surface coaming plate with outer tank skin epimerite wallboard and pressure-bearing bar; Install again after having avoided need tank deck being promoted a joint wallboard height in the prior art, reduced construction height and difficulty, strengthened tank deck stability and security.The welding of these all the other wallboards of low-temperature storage tank is identical with prior art.
Compared with prior art, the invention has the advantages that:
(1) only installing, need set up once a full hall scaffold before the outer tank deck of welding, by this full scaffold can be simultaneously with outer tank deck and suspension rod assembly welding, install; The assembly welding of interior jar furred ceiling carries out on the tank bottom outside; Assembly welding finishes only need use and leads chain and interior jar furred ceiling is promoted the height that is not more than 200mm can interior jar of furred ceiling and suspension rod be installed; No longer need secondary to set up scaffold, workload reduces greatly, and working security improves greatly; And prior art in promoting jar furred ceiling, connect suspension rod, all need set up scaffold once more when regulating suspension rod, workload is very big, manual work and material cost are all very high.
(2) need not set up interim mold during the furred ceiling assembly welding
Installing according to common process then needs in advance outside to set up on the tank bottom interim group welding clamping fixture and prevents that low temperature steel plate or aluminium sheet from directly contacting with the carbon steel steel plate and receive pollution, destruction.This mold needs construction material many, and will guarantee certain intensity, so the control aspect lacks advantage aspect engineering efficient, cost.And hoisting depth is low when among the present invention interior jar furred ceiling being connected with suspension rod behind assembly welding, the assembly welding on the tank bottom outside, so need not set up interim mold, and operation process is simple, easy operating, and labour intensity is low.
(3) assembly welding difficulty of construction in compressional zone reduces greatly, and installation, welding quality guarantee easily
Because the compression ring height that need promote has only 200-400mm, and compression ring is that welding is positive earlier, welds the back side then, so difficulty of construction reduces greatly, and construction quality is able to guarantee.
(4) the tank deck work high above the ground highly obviously reduces
The outer tank deck of single containing double-walled furred ceiling low-temperature storage tank is a spherical structure, and only the free height of tank deck generally can reach more than the 8m, if increase two-layer tank skin height, the tank deck height will reach more than 14 meters; And adopting assembly welding technique provided by the present invention the height of aerial work platform can be reduced at least more than 6 meters, the job safety risk will reduce greatly; Full hall scaffold is based on that the tank deck radian sets up simultaneously jar, and because the reduction of tank deck height, has not only reduced the consumption and the workload of full hall scaffold, has also created safer construction operation environment simultaneously.
(5) operation is simple, reasonable, efficiency of construction is high
Because the present invention only need set up once full hall scaffold, has avoided setting up of interim mold simultaneously, has simplified working procedure greatly, efficiency of construction is high, and more helps on-the-spot Comprehensive Control.
Our country strengthens low-temperature storage tank exploitation and construction dynamics just gradually at present, and this technology will promote the improvement and the raising of low-temperature storage tank construction technology level greatly.This technology has big range of application and very big promotional value, in similar low-temperature storage tank construction from now on, will bring good social benefit and economic benefit.
Description of drawings
Fig. 1 is single cutaway view that contains double-walled furred ceiling low-temperature storage tank in the embodiment of the invention;
Fig. 2 be in the embodiment of the invention in partial schematic diagram after jar furred ceiling and suspension rod and the outer tank deck installation;
Fig. 3 is the partial schematic diagram of tank deck compressional zone planar structure in the embodiment of the invention;
Fig. 4 is a planar structure sketch map of overlooking direction behind the embodiment of the invention China and foreign countries tank deck broken section;
Fig. 5 is the partial sectional view along A-A line among Fig. 4.
Specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Present embodiment is 1 30,000 m that builds for certain 1,000,000 tons of/year ethylene project 3The ethene list contains the assembly welding technique of double-walled low-temperature storage tank tank deck.Mainly comprise the steps:
As shown in Figure 1, after the outer tank skin temporary rest pier of this list containing double-walled furred ceiling low-temperature storage tank installs, on temporary rest pier, pressure-bearing bar 2 is welded.
As shown in Figure 2; Set up a full hall scaffold in the jar according to outer tank deck radian in 9 assembly weldings, the intact back of pressure-bearing bar 2 assembly weldings at the bottom of the jar; The free height of the hemispherical outer tank deck of height of full hall scaffold is that job platform is symmetrically welded at each arcuation H shaped steel 6 on pressure-bearing bar 2 and the central top board 4 with this full hall scaffold.After 6 welding of H shaped steel finish, will be welded on each H shaped steel by fixed head 10 hoops of angle steel preparation.Angle steel in the present embodiment adopts the compacting of Q345R steel plate to form.The hanger 11 that suspension rod 7 is installed directly was welded on the lower flange of H shaped steel 6 in the prefabricated stage.So far, the rack of the outer tank deck of formation just welds and has finished.
Lay tank deck plate 5 outside each circle on the rack after welding is good, outer tank deck plate 5 is welded.Outer tank deck in the present embodiment is the dome-type structure; No formal labour protection in the construction, and all weld seams all need full weld, and the welding job amount is big; The job position conversion is frequent, can be through interim hanger, nonslip tread being installed, the hoop safety rope being set and interim hanging ladder satisfies construction requirement; Compare with traditional handicraft, the height of scaffold building has reduced more than the 6m at least in the present embodiment, forms the scope of operation in a big way, and is safe and reliable, efficiency of construction is high.
Suspension rod 7 is installed on the H shaped steel hanger 11, can on hanger 11, establishes pin-and-hole, utilize pin to be connected and installed suspension rod, perhaps also available card, the fit system of buckleing are installed together suspension rod and H shaped steel, and the suspension rod 7 in the present embodiment has 300.
After suspension rod 7 installed, the above workload of scaffold height was all accomplished, promptly dismountable full hall scaffold, procedure arrangement is compact, and efficient is high.
After removing full hall scaffold, can carry out the assembly welding of interior jar furred ceiling 8, interior jar of furred ceiling 8 mainly plays the sealing function to storage medium in the jar.Interior jar of furred ceiling 8 in the present embodiment adopts aluminium alloy plate; Lay one deck fire prevention asbestos cloth on the steel plate of tank bottom 9 outside earlier; After taking certain quarantine measures, each aluminium alloy plate that constitutes interior jar furred ceiling is laid on the fire prevention asbestos cloth, can begin the welding of interior jar furred ceiling 8.The structure of interior jar of furred ceiling 8 in the present embodiment adopts high efficiency full argon protection solid core welding wire semiautomatic welding for overlap joint pattern, weld seam all is a straight angle seam.Because the flatness of outer tank bottom 1 meets the demands, therefore in jar furred ceiling 8 need not to adjust again flatness after the laying on the tank bottom 9 outside, and furred ceiling is in light weight, hoisting depth is low; For about 200mm; Directly can realize promoting,, reduce workload so under the good isolation measure, can save a large amount of means materials fully with jack; Therefore, in carrying out, need not set up interim support mold during the assembly welding of jar furred ceiling 9.
Interior jar of furred ceiling 8 after welding is good is generally about 50 tons; After finishing, an interior jar of furred ceiling assembly welding jack evenly is set in interior jar of furred ceiling outmost turns 5~10m zone; The upper end is fixed on the H shaped steel, and the lower end is connected with the reinforcing gusset lifting hole(eyelet) of interior jar of furred ceiling, and general 6~8 people just can be with should rapid lifting the in zone putting in place; Be spirally connected with corresponding suspension rod and shift to other zone again after fixing, promote middle section at last with radius.Whole furred ceiling adopts jack subregion, 10 left and right sides to promote furred ceiling, and hoisting depth is adjusted the furred ceiling levelness after lifting puts in place again about 200mm.Because the height that interior jar furred ceiling need promote reduces greatly, has avoided setting up once more scaffold, labour intensity is low, and efficiency of construction is high.And jack all need be installed by every suspension rod place in the prior art, and hoisting depth is all more than 6m, and labour intensity is big, inefficiency, poor stability.
Behind pressure-bearing bar 2 with above-mentioned assembly welding after good, outer tank deck, suspension rod 7 and the interior jar of furred ceiling 8 hydraulic pressure lifts one joint wallboard height, the group that can carry out pressure-bearing bar 2 and outer tank deck joint wallboard 1 begins wallboard and formally installs, welding.Present embodiment is the assembly welding of tank deck joint wallboard outside pressure-bearing bar 2 outer surface coaming plates carry out directly, does not need to promote, and the stability of tank deck and security are good.And in the prior art owing to be earlier weldering epimerite wallboard and then installation, welding tank deck, so tank deck construction operation face height increases, and follow-up wallboard installs the method that promotes squab panel earlier that adopts, tank body, tank deck wind resistance carry aspect potential safety hazard big.
The outer tank deck compression ring 3 of assembly welding.Compression ring 3 should be taken into account when prefabricated that welding is shunk and takes clean material prefabricated that the assembly welding of compression ring 3 is after installing the outer tank shell of two joints, to carry out, and can avoid outer tank deck plate 5 and hydraulic lifting apparatus to collide like this, can reduce operation height on the other hand.Utilize crane to be promoted to position compression ring 3 apart from pressure-bearing bar 2 upper surfaces 200~400mm; According to material cutting plan once property laying on pressure-bearing bar 2 and H shaped steel 6, group to finishing; Do not stay the last adjusting survivor of a murder attempt, guarantee the ovality of compression ring 3 and reduce the paving location vertical deviation.The welder evenly distributes and welds the positive radial abutment seam of compression ring earlier; All the weld seam welding finishes; Measure after corner angle distortion carries out record, will put in order circle compression ring integral body and raise, head when making things convenient for welder, polishing work industry, hand can be free movable below compression ring; The assurance working space is spacious, does not stay the dead angle and takes measures a pad firmly.Formal welding compression ring back side radial abutment seam is promptly faced upward seam after the weld seam back chipping passed examination; Need during welding to determine to face upward seam carbon arc air gouging depth control later welded loading based on the positive radial abutment seam of compression ring corner angle size; Utilize the welding loading to regulate the corner angle distortion of weld seam; The per pass weld seam requires back chipping thorough, reaches API620 " large-scale welding low pressure storage tank design and construction " code requirement, avoids occurring adopting measures such as secondary gouge, heating to handle problem on deformation.Because the working space scope increases, welding preheating, after heat and heat treatment operation are all very convenient in the assembly welding process of compression ring.

Claims (2)

1. a single tank deck assembly welding technique that contains the double-walled low-temperature storage tank is characterized in that comprising the steps:
1. weld the pressure-bearing bar: after the outer tank bottom of low-temperature storage tank, outer tank skin temporary rest pier install, on this temporary rest pier, accomplish the assembly welding of pressure-bearing bar earlier, in outer jar of this low-temperature storage tank, set up full hall scaffold then;
2. the outer tank deck rack of welding: the two ends that will constitute many arcuation H shaped steel of outer tank deck are welded to respectively on central top board and the said pressure-bearing bar, all arc H shaped steel weld finish after, the fixed head hoop of annular is welded on these H shaped steel; Wherein, described central top board is positioned at the center at said outer tank deck top; H shaped steel after welding finishes, central top board and fixed head constitute the rack of said outer tank deck;
3. weld outer tank deck top board: tank deck plate outside each circle of welding on said rack;
4. each suspension rod is installed on each corresponding H shaped steel, removes inner full hall scaffold;
5. the assembly welding of jar furred ceiling in outside said, carrying out on the tank bottom;
6. the interior jar of furred ceiling that welding is finished promotes with leading chain, is connected with described each suspension rod;
7. weld compression ring: said pressure-bearing bar and said outside the intersection assembly welding compression ring of tank deck plate.
2. single tank deck assembly welding technique that contains the double-walled low-temperature storage tank according to claim 1; The welding that it is characterized in that said compression ring is to weld the positive weld seam of compression ring earlier; After welding finishes; Compression ring is risen to the position apart from pressure-bearing bar upper surface 200~400mm, weld the weld seam at the compression ring back side again.
CN 201010257199 2010-08-17 2010-08-17 Tank top installing and welding process of single-coating double-wall low temperature storage tank Active CN101972897B (en)

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CN102633198B (en) * 2012-04-21 2013-08-14 陕西建工集团设备安装工程有限公司 Storage tank lifting construction method applicable to heavy wind areas
CN104275565B (en) * 2014-08-13 2016-06-15 浙江海洋学院 Oil tank strengthening core solder loading machine
CN104533003B (en) * 2014-12-25 2017-10-03 重庆飞航铝业有限公司 A kind of furred ceiling of large-scale storage tank
CN110893520A (en) * 2019-11-29 2020-03-20 中石化第四建设有限公司 Storage tank inversion method
CN113145995A (en) * 2021-04-30 2021-07-23 中国化学工程第十四建设有限公司 Construction method suitable for aluminum ceiling of large-scale full-capacity low-temperature storage tank

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