CN1040259A - Method for quick and easy repairing burst of submerged steel pipe - Google Patents
Method for quick and easy repairing burst of submerged steel pipe Download PDFInfo
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- CN1040259A CN1040259A CN 89102405 CN89102405A CN1040259A CN 1040259 A CN1040259 A CN 1040259A CN 89102405 CN89102405 CN 89102405 CN 89102405 A CN89102405 A CN 89102405A CN 1040259 A CN1040259 A CN 1040259A
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Abstract
The invention discloses a kind of method for quick and easy repairing burst of submerged steel pipe, be applicable to that bands such as the running water pipe of repairing explosion under water, discharge pressure pipeline, petroleum pipeline, gas pipe line, acetylene pipeline, compressed air line, conduit pipe press metallic conduit.This method adopts flange Hough sleeve expansion calcium chloride cement mortar filler to repair steel pipe under water, and equipment is fairly simple, and is easy and simple to handle, and it is feasible to construct, and speed is fast, and rehabilitation expense is cheap, has only one of percentage of engineering cost, and is effective.The appearance of this new technology, the cofferdam construction method is adopted in the inverted siphon explosion or leak of crossing the river that will be through with, and more renews the history of water pipe method.
Description
The invention discloses a kind of method for quick and easy repairing burst of submerged steel pipe, be applicable to that bands such as the water supply pipe of repairing explosion under water, discharge pressure pipeline, petroleum pipeline, gas pipe line, acetylene pipeline, compressed air line, conduit pipe press metallic conduit.
The method of construction of at present traditional pipe leak repair under water is broadly divided into three classes: cofferdam construction method, caisson construction method, more renew the water pipe method.The cofferdam construction method will adopt the cofferdam method fence to get up in a sheet of waters around the explosion metallic conduit under water, and water is drained repair welding again, changes time-consuming length, and construction investment is big.Caisson construction method (dry method welding under water) adopts the repair by welding submarine pipeline, this method equipment enlarging, the construction complexity is difficult to reach requirement, the welding service working time is long, the cost height is greatly expensive, for shortage of financial resources medium-sized and small enterprises were difficult to realize.More renew the water pipe method, be with moulding under water metallic conduit hang to float with barge and crane gear and, the water pipe that more renews then, difficulty is big, and is long in time limit, the expense height.At present, state's external welding submarine pipeline adopts under water that dry method welding is many.We also entrust the repair welding repairing under water of relevant works unit, adopt direct repair welding, repair welding adds that pigtail shape steel plate weldering, repair welding add the steel Hough, repair welding adds six recovery scenarios such as welding arc shape steel plate and band steel reinforcement, four diving welders welded 82.6 hours in turn, after repairing completion, through the pump water pressure is between 1.6～1.95 kgf/square centimeters, does not all reach the test pressure requirement of the inverted-siphon pipeline that crosses the river.By analysis; it mainly is so-called air draining electric welding method; the just local draining in weld seam position; the major part of weldment is all among water body; the hurried cooling action of water still exists, the no over current protection zone between weld metal body and the primary coil, and welding shows and inaccessiblely requires degree and form quenching; force welding to be broken once again, be difficult to repair.
The object of the invention is to propose a kind of explosion of steel pipe under water method for quick and easy repairing, adopts flange Hough sleeve expansion calcium chloride cement mortar filler to repair steel pipe under water, and equipment is fairly simple, easy and simple to handle, it is feasible to construct, and speed is fast, rehabilitation expense is cheap, and is effective.
Expansion calcium chloride slush mechanism and prescription, repair operation early in order to make explosion under water, damage steel pipe, make filler have rapid hardening early epistasis, impermeability, we have developed expansion calcium chloride slush, show according to interrelated data, the slush shrinkage of not mixing aluminium powder is 0.47～0.52%, after mixing 0.01% aluminium powder, the calcium hydroxide that produces in uniform aluminium powder and the cement water process in the slush works, produce airtight bubble hydrogen, the swollen rate of the body that slush is produced when initial set is 0.93～1.78%.
Contraction when hardening in order to reduce slush, we have carried out the cement mortar mix ratio design.To the material of the calcium chloride that expands, extensive studies and discussion have been carried out under water through joining performance and method of construction.Underwater cement mortar aluminium powder volume calculates by formula:
A
c＝ (kα)/(βα) （1.2 (F)/(C) +α
o）
In the formula:
A
cAluminium powder volume in the-slush (with the cement weight ratio);
(F)/(C)-cement in the ratio (being about 0.25～0.66) of pulverized fuel ash and cement plastics;
Fine aluminium content in the β alpha-aluminum powder;
K α-relevant coefficient with cement type and label;
α
o-relevant coefficient with the aggregate-to-cement ratio in the slush;
The depth of water is mixed the aluminium powder slush for 5 meters and is expanded the expansivity 7.5% under suitable 1 barometric pressure
Expansion calcium chloride slush (84pz adhesive aggregation agent under water) batching composition scope (siccative that does not add water) is: No. 600 Portland cements, 36～39.5%(weight)
Sand 63～59.3%(weight)
Aluminium powder 0.007～0.008%(weight)
Solid calcium chloride 0.9～1.1%(weight)
The summation of each component is a 100%(weight)
Wherein No. 600 Portland cements are expansion calcium chloride slush master liquid, and sand is an aggregate, and aluminium powder is a dilatant, and calcium chloride is early-strengthening agent.
Earlier that No. 600 Portland cements, sand, aluminium powder, solid calcium chloride weighing by weight percentage is good during construction, Portland cement, sand, aluminium powder siccative mix and stir earlier, solid calcium chloride is dissolved in an amount of water, and mixed siccative is stirred into the gruel shape, sucks with spray pump to be as the criterion.
Steel flanges Hough sleeve is according to the underwater grouting construction technology under water, to expansion calcium chloride slush curing condition, must have suitable temperature conditions and burst of submerged steel pipe and repair present situation, through multi-argument and comparison, carries out the comprehensive study design.Expansion calcium chloride slush generally really can reach sufficient expansion under the water curing condition, can play the effect of sealing packing course, and it can tamp the space between Hough sleeve and the pipeline fully, can make the rapid water flowing pressure-bearing of filler.
Steel flanges Hough sleeve is by reducing pipeline section welding combination, and diameter of sleeve intermediate section, two are same diameter.Reducing pipeline section combination is that cross section, sleeve intermediate section two adds the shape Steel Work transition of weldering garden and coincide, and processes by the technical requirements size.Leave a fixed gap between flange Hough sleeve intermediate section and the steel pipe, length is that one of joint roll-welding steel pipe length plus thirty angle steel is strengthened length, adds a certain amount of nargin again.Space between sleeve two path pipeline section and the pipeline adds overlap joint copper cash line footpath degree with caulking material rubber ring diameter.Flange connecting plate and Hough sleeve weld joint must add the thick triangular steel plate of weldering and strengthen, and the steel plate hard point is uniform in right amount, exempts to cause the weldment distortion.Flange connecting plate adopts thickness to make greater than Hough sleeve thickness Plate Steel.
Flange Hough sleeve material A
3Common carbon steel plate is made, and the Hough sleeve is an extra strong pipe, and can bear the water pressure test is 30 kgf/square centimeters.Should make Mechanics Calculation to steel flanges Hough sleeve, calculating mainly contains two aspects, the one, the calculating of flange connecting plate, the 2nd, the calculating of Hough sleeve wall is during the welding of flange Hough sleeve, should burn-on for the suspension ring of lifting use by designing requirement, make the flange Hough docking sleeve of two halves sheet can be not crooked,, when welded flange connecting plate and Hough sleeve, should select the minimum moment of temperature to carry out in order to reduce the temperature stress of steel material, and after welding, use dry ground topped immediately, exempt to cause the weldment distortion.
The fast simple and easy restorative procedure of burst of submerged steel pipe:
1, pipeline breaking place is basic clearly under water, adopts the current of high-pressure water pipe to dash base, cleans out the construction site.
2, repair welding is under water carried out in pipeline breaking place, with the electric welding of air draining under water direct repair welding, and at pipeline breaking place subsidy upper steel plate, welding all around, the calcium chloride slush that like this can strictness prevents to expand is infiltrated in the pipeline.
3, with locating pick-up boat, portal frame pulley, paste the sheet rubber liner on land with epoxy resin between the two Hough flanges, two flange Hough sleeves are tightened with clamping bolt with steel flanges Hough sleeve hoisted in position.
4, caulking material uses rubber ring (this rubber ring is severing, overlap with copper wire), between flange Hough sleeve two path pipeline section and the steel pipe, stuffing box packing is No. 500 Portland cements with expansibility cement (being commonly called as three-in-one) proportioning: industrial gypsum: solid calcium chloride=100: 10: the 6(weight ratio).The water layer plastic bag packaging is passed in stuffing box packing, believes to restrict and carry that the diver embeds pipe joint immediately by the diver, and water i.e. curing in 5～10 minutes is met in stuffing box packing, and pipe joint is sealed.
5, mortar gate spool and overflow pipe are installed, the mortar gate spool is connected with the top short tube union of flange Hough sleeve intermediate section two ends respectively with overflow pipe.Mortar gate spool and overflow pipe all are equipped with control flashboard valve and union near flange Hough sleeve place.
6, spray pump is installed on pick-up boat, is settled a mortar drum, require to connect spray pump outer pipe and suction pipe to drum bottom adjoined water surface simultaneously in ship one side.
7, preparation expansion calcium chloride slush: earlier with No. 600 Portland cements of required batching, sand, aluminium powder, solid calcium chloride, it is good to count by weight percentage weighing.Portland cement, sand, aluminium powder siccative mix and stir earlier, and solid calcium chloride is dissolved in an amount of water, and mixed siccative is stirred into the gruel shape, can suck with spray pump to be as the criterion.
8, expansion calcium chloride cement mortar filler pouring construction: expansion calcium chloride slush is pressurizeed through spray pump, inject between flange Hough sleeve and the steel pipe by the mortar gate spool, perfusion work will uninterruptedly be carried out continuously, this moment, the water of sleeve and pipeline gap was extruded with regard to the expansion calcium chloride slush that is received in gradually, discharge by overflow pipe, when overflow pipe water drains, and when having obvious cement grout to overflow, illustrate that empty stomach Hough sleeve and the space of repairing between the steel pipe have been full of expansion calcium chloride slush, can stop perfusion work.
9, mortar injection finishes, and can close gate spool and overflow pipe control flashboard valve, removes gate spool and overflow pipe immediately.
10, pipeline breaking place foundation ditch fills up with straw bag dress sand and tamps smooth riverbed bottom support pipeline.
11, after the perfusion of expansion calcium chloride slush, need intensity health in 2～3 days, can suppress then or water flowing.
Embodiments of the invention:
Inverted siphon (caliber Dg1000 millimeter crosses the river near the yellow mud ditch of Yangzhou eastern suburb Grand Canal, Hangzhoupro, capital, length is 157 meters, the ton of conducting oneself with dignity surplus in the of 50), explosion when running in, submarine pipeline is checked along the line repeatedly through the diver, discovery is 15 meters westwards from inverted siphon bottom portion east side, 45 centimetres of pull cracks, pipe southern side, split wide 2.0 centimetres, on the booster riverbed, formed one long 4 meters, wide 3 meters, dark about 1.2 meters hollow place.In order to repair explosion pipeline under water as early as possible, we entrust relevant works company to pass through 36 days, adopt six direct repair weldings of recovery scenario, repair welding adds the repair welding of pigtail shape steel plate and adds the steel Hough, repair welding adds welding arc shape steel plate and band steel is strengthened, four diving welders welded 82.6 hours in turn, each scheme reparation completion is after the pump water pressure is between 1.6～1.95 kgf/square centimeters, all do not reach the test pressure requirement of the inverted-siphon pipeline that crosses the river, in order to take back the time of loss, under no foreign aid's situation, the road of walking to rely on one's own efforts, through repetition test, determined that at last employing flange Hough sleeve expansion calcium chloride cement mortar filler scheme repaired the explosion inverted siphon that crosses the river.From on October 30th, 1984 cross the river the inverted siphon reparation put into production the operation so far, all right between continuous 4 years halfs, withstood test.January in this year, Dg1000 millimeter on the one aqueduct advanced Wutai Mountain one water factory's inner control valve, change electronic butterfly butterfly valve operation test, when the instantaneous quick closedown of automatic butterfly valve, make flow velocity and pressure rapid change in the pipeline produce water hammer, make in the pipeline instantaneous pressure very big, cause the pass close point, produce vertical irregular crackle with 260 meters pipelines far away, 3.2 meters of length, split wide 1.8 centimetres, primary Calculation surpasses 3～5 times of normal hydraulic pressure, really shows no sign of fluctuation and repair Grand Canal, Hangzhoupro, the capital inverted siphon that crosses the river, and it is still safe and sound to start operation.
The expansion calcium chloride slush of present embodiment institute adapted (being called for short 84Pz adhesive aggregation agent under water) batching composition.
No. 600 Portland cement 38%(weight)
Sand 61%(weight)
Aluminium powder 0.007%(weight)
Solid calcium chloride 0.993%(weight)
Add an amount of water and stir into the gruel shape, can suck with spray pump and be advisable.
The present invention is further described below with reference to accompanying drawing
Fig. 1 is that the steel river crossing breaks and repairs present situation and sleeve is repaired operation chart.
Fig. 2 is a steel flanges Hough sleeve schematic representation.
Fig. 3 is steel flanges Hough sleeve I-I sectional drawing.
In the accompanying drawing: 1, steel conduit pipe; 2, repair welding steel plate; 3, band steel; 4, angle steel; 5, steel flanges Hough sleeve; 6, rubber band; 7, expansibility cement (being commonly called as three-in-one) 8, gate; 9, union; 10, gate spool; 11, overflow pipe; 12, expansion calcium chloride slush; 13, nipple; 14, bolt hole; 15, steel plate is strengthened; 16, flange connecting plate.
With reference to accompanying drawing, method for quick and easy repairing burst of submerged steel pipe; Pipeline breaking place is clearly basic under water; The diving welder adds a repair welding steel plate (two) at steel water-supply-pipe rent, with air exhausting water power weldering under water, around sticking steel plate, weld, make expansion calcium chloride cement mortar not infiltrate in the pipeline, with steel flanges Hough sleeve (five) hoisted in position, paste the sheet rubber liner between two half flanges with epoxy resin on land, the holding screw of in flange bolt hole, packing into, and evenly bolt on, steel flanges connecting plate (16) adds the thick triangular steel plate of weldering with Hough sleeve commissure and strengthens (15), the rubber ring (6) of packing between flange Hough sleeve two path pipeline section and steel water-supply-pipe is inserted dilatancy cement, and pipe joint is sealed; Mortar gate spool (10) overflow pipe (11) is installed, slide valve (8) and articulation (9) are housed respectively in gate spool and overflow pipe, mortar gate spool (10), and overflow pipe (11) is connected on respectively in the short tube articulation; With the expansion calcium chloride cement mortar for preparing, inject between flange Hough sleeve (5) and the steel water-supply-pipe by gate spool with spray pump, water is discharged by overflow pipe (11), until expansion calcium chloride cement mortar (12) is filled; Mortar injection is complete can close gate spool and overflow pipe control flashboard valve (8), removes immediately gate spool (10) and overflow pipe (11); Pipeline breaking place foundation ditch fills up with the straw bag sand loading and tamps, and smooth riverbed supports the Hough sleeve, through the health of 2～3 days expansion calcium chloride cement mortar, can water flowing use.
Method for quick and easy repairing burst of submerged steel pipe is a great creation of pipe-repairing construction under water, and it not only constructs feasible, and rehabilitation expense is cheap, and comparison in equipment is simple, and is easy and simple to handle, instant effect, effective, practical, be worth further extensive use. Such as the inverted siphon explosion reparation of crossing the river of our Grand Canal, Hangzhoupro, capital, from designing and producing, test construction has only been used 20 day time to going into operation, adopt this method reparation only to spend about 3000 yuan of rehabilitation expenses, be one of construction costs percentage, see on its economic effect and give prominence to that social effect can't be estimated. This new technology occurs, and the cofferdam construction method is adopted in the inverted siphon explosion or leak of crossing the river that will be through with, and the Caisson method more renews the history of water pipe method.
Method for quick and easy repairing burst of submerged steel pipe, for other metallic conduit explosion under water, but also extensive use. Such as the discharge pressure pipeline, petroleum pipeline, gas piping, acetylene pipeline, compressed air piping, conduit pipe etc.
Claims (3)
1, the fast simple repairing method of a kind of burst of submerged steel pipe is characterized in that;
(1) pipeline breaking place is basic clearly under water, adopts the current of high-pressure water pipe to dash base, cleans out the construction site;
(2) repair welding is under water carried out in pipeline breaking place, with the electric welding of air draining under water, directly repair welding, and welding around steel plate is sticked in pipeline breaking place;
(3) with the location pick-up boat, the portal frame pulley is pasted the sheet rubber liner on land with epoxy resin with steel flanges Hough sleeve hoisted in position between two Houghs, with clamping bolt two flange Hough sleeves is tightened;
(4) caulking material uses the rubber cushion rubber to be severing, overlaps with copper wire),
Between flange Hough sleeve two path pipeline section and the steel pipe, stuffing box packing, with expansibility cement (being commonly called as three-in-one), proportioning is No. 500 Portland cements: industrial gypsum: solid calcium chloride=100: 10: 6 (weight ratio), the water layer plastic bag packaging is passed in stuffing box packing, believe that by the diver rope carries, the diver embeds pipe joint immediately, and stuffing box packing is met water and promptly solidified in 5～10 minutes pipe joint is sealed;
(5) mortar gate spool and overflow pipe are installed, the mortar gate spool is connected with the top short tube union of flange Hough sleeve pipe intermediate section two ends respectively with overflow pipe.Mortar gate spool and overflow pipe all are equipped with control flashboard valve and union near flange Hough sleeve place;
(6) spray pump is installed on pick-up boat, is settled a mortar drum, require to connect spray pump outer pipe and suction pipe to drum bottom adjoined water surface simultaneously in ship one side;
(7) preparation expansion calcium chloride slush; Earlier with No. 600 Portland cements of required batching, sand, aluminium powder, solid calcium chloride counts by weight percentage that weighing is good, and Portland cement, sand, aluminium powder siccative mix and stir earlier, and solid calcium chloride is dissolved in an amount of water, mixed siccative is stirred into the gruel shape, can suck with spray pump and be as the criterion;
(8) expansion calcium chloride cement mortar filler pouring construction; Expansion calcium chloride slush is pressurizeed through spray pump, inject between flange Hough sleeve and the steel pipe by the mortar gate spool, perfusion work will uninterruptedly be carried out continuously, this moment, the water of sleeve and pipeline gap was extruded with regard to the expansion calcium chloride slush that is received in gradually, discharge by overflow pipe, when overflow pipe water drains, and when having obvious cement grout to overflow, illustrate that empty stomach Hough sleeve and the space of repairing between the steel pipe have been full of expansion calcium chloride slush, can stop perfusion work;
(9) mortar injection finishes and can close gate spool and overflow pipe control flashboard valve, removes gate spool and overflow pipe immediately.
(10) pipeline breaking place foundation ditch fills up with straw bag dress sand and tamps, and pipeline is supported in bottom, smooth riverbed,
After the perfusion of (11) expansion calcium chloride slush, need intensity health in 2～3 days, can suppress then or water flowing.
2, method for quick and easy repairing burst of submerged steel pipe according to claim 1, the calcium chloride slush that it is characterized in that expanding batching composition scope (siccative that does not add water) is:
No. 600 Portland cement 36～39.5%(weight)
Sand 63～59.3%(weight)
Aluminium powder 0.007～0.008%(weight)
Solid calcium chloride 0.9～1.1%(weight)
The each component summation is a 100%(weight)
3, method for quick and easy repairing burst of submerged steel pipe according to claim 1, it is characterized in that steel flanges Hough sleeve is by reducing tube section welding combination, diameter of sleeve intermediate section, the same diameter in two, reducing pipeline section combination are that cross section, sleeve intermediate section two adds the transition of weldering circular steel product and coincide; Leave a fixed gap between flange Hough sleeve intermediate section and the steel pipe, length is that one of joint roll-welding steel pipe length plus thirty angle steel reinforcement length adds a certain amount of nargin again, space between flange Hough sleeve two path pipeline section and the pipeline adds overlap joint copper cash line footpath degree with caulking material rubber ring diameter; Flange connecting plate adopts thickness to make greater than the Plate Steel of Hough sleeve thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102405 CN1018573B (en) | 1989-05-17 | 1989-05-17 | Rapid and simple method for repairing burst of underwater steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102405 CN1018573B (en) | 1989-05-17 | 1989-05-17 | Rapid and simple method for repairing burst of underwater steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1040259A true CN1040259A (en) | 1990-03-07 |
| CN1018573B CN1018573B (en) | 1992-10-07 |
Family
ID=4854680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89102405 Expired CN1018573B (en) | 1989-05-17 | 1989-05-17 | Rapid and simple method for repairing burst of underwater steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1018573B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101602946B (en) * | 2009-07-07 | 2011-02-09 | 东南大学 | Overwetting soil solidified agent and method for solidifying soil |
| CN102242851A (en) * | 2011-06-20 | 2011-11-16 | 四川泰鑫实业发展有限责任公司 | Simple and convenient method for maintaining pipelines |
| CN102900893A (en) * | 2012-10-25 | 2013-01-30 | 中国海洋石油总公司 | Plugging device and plugging method for annular space of submarine double-layer oil conveying pipe |
| CN103216701A (en) * | 2013-05-02 | 2013-07-24 | 新兴铸管股份有限公司 | Method of quick cutting off cast-iron pipe |
| CN108253202A (en) * | 2016-12-28 | 2018-07-06 | 北京市水利规划设计研究院 | Pipeline and preparation method thereof |
| CN108730670A (en) * | 2018-06-08 | 2018-11-02 | 徐州卓纳科技服务有限公司 | It is a kind of without turn off supply water be replaceable pvc pipe equipment |
| CN109681714A (en) * | 2018-12-20 | 2019-04-26 | 科莱斯（天津）电热科技有限公司 | A kind of method that accompanying-heat cable threading is welded with steel pipe skylight |
| CN110965487A (en) * | 2019-12-20 | 2020-04-07 | 广西建工集团第五建筑工程有限责任公司 | Down-through channel high-flow inverted siphon sewage pipe and encapsulation treatment construction method |
| CN111473961A (en) * | 2019-01-23 | 2020-07-31 | 中石化石油工程技术服务有限公司 | Submarine pipeline repairs testing arrangement under water |
| CN111503419A (en) * | 2020-04-28 | 2020-08-07 | 广东德泽建设工程有限公司 | Underground sewage pipeline non-excavation stainless steel expansion ring joint repairing construction method |
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-
1989
- 1989-05-17 CN CN 89102405 patent/CN1018573B/en not_active Expired
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101602946B (en) * | 2009-07-07 | 2011-02-09 | 东南大学 | Overwetting soil solidified agent and method for solidifying soil |
| CN102242851A (en) * | 2011-06-20 | 2011-11-16 | 四川泰鑫实业发展有限责任公司 | Simple and convenient method for maintaining pipelines |
| CN102900893A (en) * | 2012-10-25 | 2013-01-30 | 中国海洋石油总公司 | Plugging device and plugging method for annular space of submarine double-layer oil conveying pipe |
| CN103216701A (en) * | 2013-05-02 | 2013-07-24 | 新兴铸管股份有限公司 | Method of quick cutting off cast-iron pipe |
| CN108253202A (en) * | 2016-12-28 | 2018-07-06 | 北京市水利规划设计研究院 | Pipeline and preparation method thereof |
| CN108730670A (en) * | 2018-06-08 | 2018-11-02 | 徐州卓纳科技服务有限公司 | It is a kind of without turn off supply water be replaceable pvc pipe equipment |
| CN109681714A (en) * | 2018-12-20 | 2019-04-26 | 科莱斯（天津）电热科技有限公司 | A kind of method that accompanying-heat cable threading is welded with steel pipe skylight |
| CN111473961A (en) * | 2019-01-23 | 2020-07-31 | 中石化石油工程技术服务有限公司 | Submarine pipeline repairs testing arrangement under water |
| CN110965487A (en) * | 2019-12-20 | 2020-04-07 | 广西建工集团第五建筑工程有限责任公司 | Down-through channel high-flow inverted siphon sewage pipe and encapsulation treatment construction method |
| CN110965487B (en) * | 2019-12-20 | 2023-12-08 | 广西建工集团第五建筑工程有限责任公司 | Down-pass passage high-flow reverse-suction siphon sewage pipe and encapsulation treatment construction method |
| CN111503417A (en) * | 2020-04-23 | 2020-08-07 | 胡惠琴 | Pipeline |
| CN111503417B (en) * | 2020-04-23 | 2022-09-23 | 义乌市圣涛装饰有限公司 | Pipeline |
| CN111503419A (en) * | 2020-04-28 | 2020-08-07 | 广东德泽建设工程有限公司 | Underground sewage pipeline non-excavation stainless steel expansion ring joint repairing construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1018573B (en) | 1992-10-07 |
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