CN102927363A - Construction method for extracting blind plate under coal gas - Google Patents
Construction method for extracting blind plate under coal gas Download PDFInfo
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- CN102927363A CN102927363A CN2012104210480A CN201210421048A CN102927363A CN 102927363 A CN102927363 A CN 102927363A CN 2012104210480 A CN2012104210480 A CN 2012104210480A CN 201210421048 A CN201210421048 A CN 201210421048A CN 102927363 A CN102927363 A CN 102927363A
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Abstract
The invention discloses a construction method for extracting a blind plate under coal gas. The construction method comprises the steps of: erecting an operation platform and an escape way, manufacturing a bracket, detecting coal gas, welding the bracket, loosening a bolt, measuring blind plate thickness, welding a hanging ring, manufacturing a blind plate ring and a sealing cushion, installing a lifting jack, extracting the blinding plate, installing the blind plate ring, fastening the bolt, booster detecting, clearing and leaving the scene. According to the construction method for extracting the blind plate under the coal gas, the traditional operating method is improved for butt joint of novel and old pipelines under coal gas, thereby not only saving production and construction cost, but also reducing environment pollution; and simultaneously, construction method is quick in construction progress, good in quality, safe and reliable, and has promotional value.
Description
Technical field
The present invention relates to a kind of gas pipe line docking method of construction, particularly a kind of band coal gas is taken out the blind plate method of construction.
Background technique
Present new and old gas pipe line docking is the important step that new construction combines with original engineering in the technological transformation project, and it is often restricting the construction period of new construction, has influence on again the normal production of other relevant unit, is with simultaneously gas operation, and is greatly dangerous.
Traditional band gas pipe line and the docking of newly-built gas pipe line are removed blind plate and are usually adopted the side by side space gas of stopping the supple of gas or steam, carry out again the method for construction of pipeline docking, so just need to stop production, stop the supple of gas or steam and carry out again the blind plate Demolition Construction after displacement is finished, time swap is longer on the one hand, produced the waste of human and material resources resources, stopping the supple of gas or steam on the other hand affects the normal construction production of manufacturing enterprise, increased the cost of production of production unit, reduced manufacturing efficiency, having is exactly that emptying coal gas can pollute air again, and living environment is impacted.Traditional like this method had both been polluted environment, had increased again cost of production, had also increased construction cost simultaneously, had prolonged the engineering time.
Summary of the invention
In order not affect production, the present invention has designed new band coal gas and has taken out the blind plate method of construction.Band gas pipe line and newly-built pipeline docking construction can be adopted this method, utilize the method can be under the gas pipe line normal operating condition, utilize the repair time, band coal gas extracts blind plate after reducing the gas pressure in the pipeline, so neither impact is produced and construction, the waste of the human and material resources resource that also can reduce displacement and produce, safe and reliable, have promotional value.
To achieve these goals, the invention provides a kind of band coal gas and take out the blind plate method of construction, may further comprise the steps:
Step 2. adopts carbon monoxide detector to detect original piping flange and blind plate, guarantees without gas leakage;
It is normal working that step 3. keeps the barotropic state of original pipeline, is symmetrically welded four pairs of supports according to the length of jack at original pipeline of flange both sides and level and the plumb position of newly-built pipeline;
Step 4. adopts bolt looseness liquid that all bolts are become flexible, and removes smoothly with the assurance blind plate and implements, and is loosening rear fastening one by one, to prevent gas leakage, simultaneously blind plate thickness measured;
There is certain angle at two hangers of blind plate top vertical line bilateral symmetry welding in step 5. between two hangers, in order to lift when extracting blind plate;
The crane that step 7. will extract blind plate is parked in the position of being convenient to lift, and hoisting rig is suspended on two hangers of blind plate, and hangs up two chain blocks at rigging, with angle and the speed of conveniently adjusting hoisting;
Step 8. adopts nitrogen replacement with newly-built pipeline, and detect qualified;
Step 9. is after original manifold pressure is down to 1～2.5kpa or after the original pipeline terminal valve of heavy caliber is closed, 3～4 bolts I of flange bottom are replaced by the longer bolt II of length, and with nut and bolt II band buckle, then with the one by one loosening dismounting of all the other bolt I;
Step 12. is cleared up flange facing with explosion-proof scraper, blind plate ring and the sealing gasket of packing into after cleaning out and making, and penetrate the bolt I, and then remove its excess-three platform jack, the stay bolt II of flange bottom is replaced by the bolt I, then even clamping bolt I;
Step 13. detection of boosting until original pipeline and newly-built manifold pressure rise to working pressure, adopts soap solution or gas leak detector to detect coal gas without leakage, and newly-built pipeline docks with original pipeline to be finished;
Step 14. site clearing, dismantling operation platform and passway for escaping are withdrawn the scene.
Preferably, the thickness of described blind plate ring should be than the little 5～10mm of blind plate thickness, and the width of blind plate ring should be than the slightly wide about 10mm of flange facing.
Preferably, described sealing gasket adopts the immersion oil packing to twine and makes, and the packing number of winding should be no less than 2 circles, and the packing interface adopts 45 ° of oblique angle docking, and with iron wire the sealing gasket point is welded in described blind plate ring both sides.
Preferably, described support is steel structure support.
Preferably, the described passway for escaping gradient should be less than 30 °, and width should be greater than 1 meter.
Preferably, the angle between described two hangers is about 30 °.
Preferably, described bolt II is than the long 30～50mm of bolt I.
Preferably, described jack can adopt 16 tons or 32 tons of screw jack according to pipe diameter size.
The invention has the beneficial effects as follows: band coal gas according to the present invention is taken out the blind plate method of construction, traditional operating method is reformed, realized the docking with the new and old pipeline of coal gas, production and construction cost had both been saved, reduced again environmental pollution, the fast quality of construction speed is good, safe and reliable simultaneously, has promotional value.
Description of drawings
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the newly-built pipeline of the present invention and original pipeline connection diagram;
Fig. 3 is supporting structure schematic representation of the present invention;
Fig. 4 is support welding schematic representation of the present invention;
Fig. 5 is blind plate hanger welding schematic representation of the present invention;
Fig. 6 is blind plate ring of the present invention and sealing gasket schematic representation;
Fig. 7 is that the A-A of Fig. 6 is to view;
Fig. 8 is that blind plate of the present invention extracts the lifting schematic representation.
Reference character:
1: blind plate 2: flange 3: original pipeline
4: newly-built pipeline 5: bolt I 6: support
61: stiffening rib 62: welding block 63: support block
7: blind plate ring and sealing gasket 71: blind plate ring 72: sealing gasket
73: iron wire 8: hanger 9: rigging
10: chain block 11: suspension hook
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, and obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiments that obtain under the creative work prerequisite.Therefore, accompanying drawing is illustrative with being described in essence, rather than is used for the protection domain of restriction claim.In addition, in this manual, accompanying drawing draws not in scale, and identical reference character represents identical part.
Fig. 1 is process flow diagram of the present invention, has described construction sequence and the flow process of taking out the blind plate method of construction with coal gas.
As shown in Figure 1, after personnel, facility are marched into the arena, at first need according to position scaffolding height suitable operating platform and the passway for escaping of construction requirement at dismounting blind plate 1, this passway for escaping gradient should be less than 30 °, and width should be greater than 1 meter.
Make support 6 when setting up operating platform, the preferred support 6 of present embodiment is steel structure.As shown in Figure 3, support 6 comprises stiffening rib 61, welding block 62 and support block 63, when making, stiffening rib 61, welding block 62 and support block 63 are welded into an integral body according to the technique status requirement, stiffening rib 61 and welding block 62 are in order to be welded on the tube wall, support block 63 is welded on welding block 62 tops, in order to place jack.
Then, adopt carbon monoxide detector to detect original piping flange 2 and blind plate 1, guarantee without gas leakage.Being in barotropic state in original pipeline 3 is under the normal working, determine distance between 2 liang of side supports 6 of flange according to the length of jack, on original pipeline 3 of flange 2 both sides and newly-built pipeline 4, be symmetrically welded four pairs of supports 6 along level and plumb position, the horizontal stand 6 of the left and right sides slightly makes progress, the welding of support 6 should arrange the abundant professional welder of construction experience to operate, to prevent the excessive puncture tube wall of electric current.
For guaranteeing the smooth enforcement that extracts of blind plate 1, before blind plate 1 extracts, adopt bolt looseness liquid that all bolt I 5 are become flexible, loosening rear fastening one by one, to prevent gas leakage, simultaneously the thickness of blind plate 1 is measured.
As shown in Figure 5, before blind plate 1 extracts, need the angle between 8, two hangers 8 of blind plate 1 top vertical line bilateral symmetry two hangers of welding be about 30 °, so that lifting when extracting blind plate 1.
Then make blind plate ring 71 and sealing gasket 72 according to the thickness of blind plate 1, the thickness of blind plate ring 71 should be suitable mutually with the thickness of blind plate 1, and look duct length and the extending amount size determines that blind plate ring 71 is than the little 5～10mm of blind plate 1 thickness.The width of blind plate ring 71 should be than the slightly wide 10mm of flange 2 sealing surfaces.
Adopt the immersion oil packing to make sealing gasket 72, in the situation that does not affect installation, sealing gasket 72 should be tried one's best thicker, and the packing number of winding should be no less than 2 circles, reduces transition joint to guarantee sealing effect as far as possible, and the packing interface adopts 45 ° of oblique angle docking.As shown in Figure 6 and Figure 7,73 on sealing gasket 72 usefulness iron wires are welded in blind plate ring 71 both sides.
Then, the crane (not shown) that extracts blind plate 1 is parked in the position of being convenient to lift, as shown in Figure 8, the hoisting rig 9 that is suspended on the suspension hook 11 is suspended on the blind plate hanger 8, then hang up two 3 tons chain block 10 at rigging 9, the angle that conveniently adjusts hoisting and speed.
Then, newly-built pipeline is adopted nitrogen replacement, and detect qualified.
After manifold pressure is down to 1～2.5kpa, can remove blind plate work, if large diameter pipeline can be removed blind plate work after terminal valve can being closed, participate in dismounting blind plate staff and all should correctly wear air respiratorresuscitator.
Prepare to remove bolt I 5, at first 3～4 bolts I 5 of flange 2 bottoms are replaced by the longer bolt II (not shown) of length, flange 2 is organized difficulty behind bolt I 5 complete removals in the time of can preventing like this that pipe stress is excessive.Present embodiment preferred bolt II is than the long 30～50mm of bolt I, and with nut and bolt II band buckle, then with all the other bolt I 5 loosening dismounting one by one.
After having removed bolt I 5, the jack (not shown) of four same load is installed at support 6 places, can be adopted 16 tons or 32 tons of screw jack according to pipe diameter size, with flange 2 separation of blind plate 1 both sides.Jack is fixing solid and reliable, and the action of four jack should be evenly, synchronously, stops to move during the about 20mm in gap to be ejected.
Then remove the jack at top, slightly firmly prize blind plate 1 with explosion-proof crowbar, after blind plate 1 is loosening, pull with hand hoist angle and speed that chain block 10 is adjusted blind plates 1, blind plate 1 is extracted out slowly, accessible after, crane hangs out blind plate 1 and is put into the appointed place.
Subsequently, adopt simultaneously explosion-proof scraper cleaning flange 2 sealing surfaces by many people, in the middle of flange 2, install and the suitable blind plate ring 71 of blind plate 1 thickness and sealing gasket 72 after cleaning out, penetrate bolt I 5, remove its excess-three platform jack, the bolt II of flange 2 bottoms is replaced by bolt I 5, then even clamping bolt I 5.
After docking is finished, to the detection of boosting of original pipeline 3 and newly-built pipeline 4, until the pressure in original pipeline 3 and the newly-built pipeline 4 rises to working pressure, adopt soap solution or gas leak detector to detect coal gas without till leaking, original pipeline 3 and 4 docking of newly-built pipeline are finished.
Carry out at last the scene cleaning, dismantling operation platform and passway for escaping, personnel's general evacuation is on-the-spot.So far, it is complete that band coal gas is taken out the blind plate construction, and original pipeline 3 finishes with newly-built pipeline 4 mating operations, and newly-built pipeline 4 can put into operation after displacement assay is qualified.
As mentioned above, band coal gas according to the present invention is taken out the blind plate method of construction, traditional operating method is reformed, realized the docking with the new and old pipeline of coal gas, both saved production and construction cost, and reduced again environmental pollution, the fast quality of construction speed is good simultaneously, safe and reliable, have promotional value.
Claims (8)
1. a band coal gas is taken out the blind plate method of construction, it is characterized in that, may further comprise the steps:
Step 1. removing suitable operating platform and the passway for escaping of blind plate position scaffolding height, simultaneously, is made support according to construction requirement;
Step 2. adopts carbon monoxide detector to detect original piping flange and blind plate, guarantees without gas leakage;
It is normal working that step 3. keeps the barotropic state of original pipeline, is symmetrically welded four pairs of supports according to the length of jack at original pipeline of flange both sides and level and the plumb position of newly-built pipeline;
Step 4. adopts bolt looseness liquid that all bolts are become flexible, and removes smoothly with the assurance blind plate and implements, and is loosening rear fastening one by one, to prevent gas leakage, simultaneously blind plate thickness measured;
There is certain angle at two hangers of blind plate top vertical line bilateral symmetry welding in step 5. between two hangers, in order to lift when extracting blind plate;
Step 6. is made and the suitable blind plate ring of blind plate thickness and sealing gasket;
The crane that step 7. will extract blind plate is parked in the position of being convenient to lift, and hoisting rig is suspended on two hangers of blind plate, and hangs up two chain blocks at rigging, with angle and the speed of conveniently adjusting hoisting;
Step 8. adopts nitrogen replacement with newly-built pipeline, and detect qualified;
Step 9. is after original manifold pressure is down to 1～2.5kpa or after the original pipeline terminal valve of heavy caliber is closed, 3～4 bolts I of flange bottom are replaced by the longer bolt II of length, and with nut and bolt II band buckle, then with the one by one loosening dismounting of all the other bolt I;
Step 10. is installed four jack that load is identical at the support place, separate by the flange of jack with the blind plate both sides, and gap to be ejected stops action when being about 20mm;
Step 11. is removed the jack at original pipeline and newly-built pipeline top, slightly prizes blind plate with explosion-proof crowbar, and after loosening rear blind plate being blown slowly by chain block of blind plate extracted out, be accessible, crane hung out blind plate and is put into the appointed place;
Step 12. is cleared up flange facing with explosion-proof scraper, blind plate ring and the sealing gasket of packing into after cleaning out and making, and penetrate the bolt I, and then remove its excess-three platform jack, the bolt II of flange bottom is replaced by the bolt I, then even clamping bolt I;
Step 13. detection of boosting until original pipeline and newly-built manifold pressure rise to working pressure, adopts soap solution or gas leak detector to detect coal gas without leakage, and newly-built pipeline docks with original pipeline to be finished;
Step 14. site clearing, dismantling operation platform and passway for escaping are withdrawn the scene.
2. band coal gas according to claim 1 is taken out the blind plate method of construction, it is characterized in that: the thickness of described blind plate ring should be than the little 5～10mm of blind plate thickness, and the width of blind plate ring should be than the slightly wide about 10mm of flange facing.
3. band coal gas according to claim 1 is taken out the blind plate method of construction, it is characterized in that: described sealing gasket adopts the immersion oil packing to twine and makes, the packing number that twines should be no less than 2 circles, and the packing interface adopts 45 ° of oblique angle docking, and with iron wire the sealing gasket point is welded in described blind plate ring both sides.
4. band coal gas according to claim 1 is taken out the blind plate method of construction, it is characterized in that: described support is steel structure support.
5. band coal gas according to claim 1 is taken out the blind plate method of construction, it is characterized in that: the described passway for escaping gradient should be less than 30 °, and width should be greater than 1 meter.
6. band coal gas according to claim 1 is taken out the blind plate method of construction, it is characterized in that: the angle between described two hangers is about 30 °.
7. band coal gas according to claim 1 is taken out the blind plate method of construction, it is characterized in that: described bolt II is than the long 30～50mm of bolt I.
8. band coal gas according to claim 1 is taken out the blind plate method of construction, it is characterized in that: described jack can adopt 16 tons or 32 tons of screw jack according to pipe diameter size.
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| CN201210421048.0A CN102927363B (en) | 2012-10-29 | 2012-10-29 | Construction method for extracting blind plate under coal gas |
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| CN201210421048.0A CN102927363B (en) | 2012-10-29 | 2012-10-29 | Construction method for extracting blind plate under coal gas |
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| CN102927363B CN102927363B (en) | 2014-09-24 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105479098A (en) * | 2014-10-10 | 2016-04-13 | 五冶集团上海有限公司 | Online dismounting method for large-scale gas pipeline |
| CN106151680A (en) * | 2015-04-24 | 2016-11-23 | 五冶集团上海有限公司 | Gas piping is with pressure takes out stifled blind plate method |
| CN106151766A (en) * | 2015-04-24 | 2016-11-23 | 五冶集团上海有限公司 | Blind plate preparation method for gas piping |
| CN106151765A (en) * | 2015-04-24 | 2016-11-23 | 五冶集团上海有限公司 | For guide post that gas piping blind plate is installed and preparation method thereof |
| CN106870865A (en) * | 2017-03-03 | 2017-06-20 | 淄博伟恒阀门有限公司 | Solder type is blown turnover panel isolating valve, construction method |
| CN108756424A (en) * | 2018-08-15 | 2018-11-06 | 江苏省送变电有限公司 | Adjusting device is opened to transmission line steel-pipe tower main pipe root |
| CN111745608A (en) * | 2020-07-08 | 2020-10-09 | 中建四局安装工程有限公司 | Rail type mounting device and method for integrated group of refrigerating room pipeline equipment |
| CN111853388A (en) * | 2020-07-13 | 2020-10-30 | 内蒙古恒坤化工有限公司 | Gas pipeline installation supporting device and using method thereof |
| WO2022062068A1 (en) * | 2020-09-23 | 2022-03-31 | 中交第四航务工程局有限公司 | Large-diameter ultra-long hdpe pipe closure method |
| CN114526386A (en) * | 2022-01-07 | 2022-05-24 | 广东韶钢工程技术有限公司 | Flowmeter flange dismounting device and using method |
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| CN105479098A (en) * | 2014-10-10 | 2016-04-13 | 五冶集团上海有限公司 | Online dismounting method for large-scale gas pipeline |
| CN106151766B (en) * | 2015-04-24 | 2019-06-14 | 五冶集团上海有限公司 | Blind plate production method for gas piping |
| CN106151680A (en) * | 2015-04-24 | 2016-11-23 | 五冶集团上海有限公司 | Gas piping is with pressure takes out stifled blind plate method |
| CN106151766A (en) * | 2015-04-24 | 2016-11-23 | 五冶集团上海有限公司 | Blind plate preparation method for gas piping |
| CN106151765A (en) * | 2015-04-24 | 2016-11-23 | 五冶集团上海有限公司 | For guide post that gas piping blind plate is installed and preparation method thereof |
| CN106151765B (en) * | 2015-04-24 | 2018-06-26 | 五冶集团上海有限公司 | Guide rod for the installation of gas piping blind plate and preparation method thereof |
| CN106151680B (en) * | 2015-04-24 | 2018-10-19 | 五冶集团上海有限公司 | With pressure take out of gas piping blocks up blind plate method |
| CN106870865A (en) * | 2017-03-03 | 2017-06-20 | 淄博伟恒阀门有限公司 | Solder type is blown turnover panel isolating valve, construction method |
| CN106870865B (en) * | 2017-03-03 | 2019-01-15 | 淄博伟恒阀门有限公司 | Solder type is blown turnover panel isolating valve, construction method |
| CN108756424A (en) * | 2018-08-15 | 2018-11-06 | 江苏省送变电有限公司 | Adjusting device is opened to transmission line steel-pipe tower main pipe root |
| CN108756424B (en) * | 2018-08-15 | 2024-04-26 | 江苏省送变电有限公司 | Main pipe root opening adjusting device of power transmission line steel pipe tower |
| CN111745608A (en) * | 2020-07-08 | 2020-10-09 | 中建四局安装工程有限公司 | Rail type mounting device and method for integrated group of refrigerating room pipeline equipment |
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| CN114526386A (en) * | 2022-01-07 | 2022-05-24 | 广东韶钢工程技术有限公司 | Flowmeter flange dismounting device and using method |
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