CN102927363B - 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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- CN102927363B CN102927363B CN201210421048.0A CN201210421048A CN102927363B CN 102927363 B CN102927363 B CN 102927363B CN 201210421048 A CN201210421048 A CN 201210421048A CN 102927363 B CN102927363 B CN 102927363B
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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 blind plate method of construction.
Background technique
Current new and old gas pipe line docking, is the important step that in technological transformation project, new construction combines with original engineering, and it is often restricting construction period of new construction, has influence on again the normal production of other relevant unit, is with gas operation simultaneously, dangerous very big.
Traditional band gas pipe line and the docking of newly-built gas pipe line are removed blind plate and are conventionally adopted the space gas side by side 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 after having replaced and carry out again blind plate Demolition Construction, time swap is longer on the one hand, produce the waste of human and material resources resources, stop the supple of gas or steam on the other hand and affect the normal construction production of manufacturing enterprise, increase the cost of production of production unit, reduce 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 extended 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 blind plate method of construction.Band gas pipe line and newly-built pipeline docking construction can adopt this method, utilize the method can be under gas pipe line normal operating condition, utilize the repair time, after reducing the gas pressure in pipeline, be with coal gas to extract blind plate, 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, there is promotional value.
To achieve these goals, the invention provides a kind of band coal gas and take out blind plate method of construction, comprise the following steps:
Step 1. is being removed suitable operating platform and the passway for escaping of blind plate position scaffolding height according to construction requirement, meanwhile, makes support;
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 in original pipeline of flange both sides and the level of newly-built pipeline and plumb position;
Step 4. adopts bolt looseness liquid to become flexible all bolts, implements to ensure that blind plate is removed smoothly, loosening rear fastening one by one, to prevent gas leakage, blind plate thickness is measured simultaneously;
At two hangers of blind plate top vertical line bilateral symmetry welding, there is certain angle between two hangers in step 5., to lift while extracting blind plate;
Step 6. is made and the suitable blind plate ring of blind plate thickness and sealing gasket;
Step 7. is parked in the crane that extracts blind plate the position of being convenient to lifting, hoisting rig is suspended on two hangers of blind plate, and on rigging, hangs up two chain blocks, to facilitate adjust hoisting angle and speed;
Newly-built pipeline is adopted nitrogen replacement by step 8., 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 bolt II that length is longer, and by nut and bolt II band buckle, then by all the other bolt I loosening dismounting one by one;
Step 10. is installed four jack that load is identical at support place, by jack, the flange of blind plate both sides is separated, and stops action in the time that the gap ejecting is about 20mm;
Step 11. is removed the jack at original pipeline and newly-built pipeline top, slightly prizes blind plate with explosion-proof crowbar, after blind plate is loosening, by chain block, blind plate is extracted out slowly, accessible after, crane hangs out blind plate to be put into appointed place;
For step 12., explosion-proof scraper cleaning flange facing, packs blind plate ring and the sealing gasket made into, and penetrates bolt I after cleaning out, and then removes its excess-three platform jack, the stay bolt II of flange bottom is replaced by 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 has docked with original pipeline;
Step 14. site clearing, dismantling operation platform and passway for escaping, withdraw 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 immersion oil packing to be wound around and makes, and the packing number of winding should be no less than 2 circles, and packing interface adopts 45 ° of oblique angles docking, and sealing gasket point is welded in to described blind plate ring both sides with iron wire.
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 blind plate method of construction, traditional operating method is reformed, realize the docking with the new and old pipeline of coal gas, both production and construction cost had been saved, reduce again environmental pollution, the fast quality of construction speed is good, safe and reliable simultaneously, has promotional value.
Brief description of the 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 diagram of the present invention;
Fig. 4 is support welding schematic diagram of the present invention;
Fig. 5 is blind plate hanger welding schematic diagram of the present invention;
Fig. 6 is blind plate ring of the present invention and sealing gasket schematic diagram;
Fig. 7 is that the A-A of Fig. 6 is to view;
Fig. 8 is that blind plate of the present invention extracts lifting schematic diagram.
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 object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making all other embodiments that obtain under creative work prerequisite, belong to the scope of protection of the invention.Therefore, accompanying drawing is illustrative with being described in essence, instead of for limiting the protection domain of 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 blind plate method of construction with coal gas.
As shown in Figure 1, after personnel, facility are marched into the arena, first need suitable operating platform and the passway for escaping of position scaffolding height at dismounting blind plate 1 according to construction requirement, this passway for escaping gradient should be less than 30 °, and width should be greater than 1 meter.
In setting up operating platform, make support 6, the preferred support 6 of the present embodiment is steel structure.As shown in Figure 3, support 6 comprises stiffening rib 61, welding block 62 and support block 63, in the time making, stiffening rib 61, welding block 62 and support block 63 are welded into an entirety according to technique status requirement, stiffening rib 61 and welding block 62 are in order to be welded on 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.In original pipeline 3 under barotropic state is normal working, determine the 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 upwards, the welding of support 6 should arrange the professional welder that construction experience is abundant to operate, to prevent the excessive tube wall that punctures of electric current.
For ensureing the smooth enforcement that extracts of blind plate 1, before blind plate 1 extracts, adopt bolt looseness liquid to become flexible all bolt I 5, loosening rear fastening one by one, to prevent gas leakage, the thickness of blind plate 1 is measured simultaneously.
As shown in Figure 5, before blind plate 1 extracts, need be about 30 ° by the angle between 8, two hangers 8 of blind plate 1 top vertical line bilateral symmetry two hangers of welding, so that lifting while 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 mutually suitable with the thickness of blind plate 1, and look duct length and 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 immersion oil packing to make sealing gasket 72, in the situation that not affecting 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 ensure sealing effect as far as possible, and packing interface adopts 45 ° of oblique angle docking.As shown in Figure 6 and Figure 7,73, sealing gasket 72 use iron wire is welded in blind plate ring 71 both sides.
Then, the crane (not shown) that extracts blind plate 1 is parked in to the position of being convenient to lifting, as shown in Figure 8, the hoisting rig 9 being suspended on suspension hook 11 is suspended on blind plate hanger 8, then on rigging 9, hang up the chain block 10 of two 3 tons, the angle that conveniently adjusts hoisting and speed.
Then, newly-built pipeline is adopted to 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, first 3～4 bolts I 5 of flange 2 bottoms be replaced by the bolt II (not shown) that length is longer, can prevent like this that pipe stress is excessive time flange 2 after bolt I 5 complete removals group to difficulty.The present embodiment preferred bolt II is than the long 30～50mm of bolt I, and by nut and bolt II band buckle, then by all the other bolt I 5 loosening dismounting one by one.
Removed after bolt I 5, at support, the jack (not shown) of four same load is installed at 6 places, can adopt 16 tons or 32 tons of screw jack according to pipe diameter size, and the flange 2 of blind plate 1 both sides is separated.Jack is fixing solid and reliable, and the action of four jack should be evenly, synchronous, wait eject the about 20mm in gap time stop moving.
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 chain block 10 and adjust hoist angle and the speed of blind plate 1, blind plate 1 is extracted out slowly, accessible after, crane hangs out blind plate 1 to be put into appointed place.
Subsequently, adopt explosion-proof scraper cleaning flange 2 sealing surfaces by many people simultaneously, after cleaning out, in the middle of flange 2, install and the blind plate suitable blind plate ring 71 of 1 thickness and sealing gasket 72, 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 having docked, to the detection of boosting of original pipeline 3 and newly-built pipeline 4, until the pressure in original pipeline 3 and 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 newly-built pipeline 4 have docked.
Finally carry out scene cleaning, dismantling operation platform and passway for escaping, personnel's general evacuation scene.So far, it is complete that band coal gas is taken out 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 blind plate method of construction, traditional operating method is reformed, realize 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, there is promotional value.
Claims (3)
1. band coal gas is taken out a blind plate method of construction, it is characterized in that, comprises the following steps:
Step 1. is being removed suitable operating platform and the passway for escaping of blind plate position scaffolding height according to construction requirement, meanwhile, makes support; Wherein, the described passway for escaping gradient is less than 30 °, and width is greater than 1 meter;
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 in original pipeline of flange both sides and the level of newly-built pipeline and plumb position; Wherein, the described support of the level of the left and right sides upwards; Described support is steel structure support; And,
Described support comprises stiffening rib, welding block and support block, described stiffening rib, described welding block and described support block are welded into an entirety according to technique status requirement, described stiffening rib and described welding block are in order to be welded on tube wall, described support block is welded on described welding block top, in order to place jack;
Step 4. adopts bolt looseness liquid to become flexible all bolts, implements to ensure that blind plate is removed smoothly, loosening rear fastening one by one, to prevent gas leakage, blind plate thickness is measured simultaneously;
At two hangers of blind plate top vertical line bilateral symmetry welding, there is certain angle between two hangers in step 5., to lift while extracting blind plate; Wherein, the angle between described two hangers is 30 °;
Step 6. is made and the suitable blind plate ring of blind plate thickness and sealing gasket; Wherein, the little 5～10mm of Thickness Ratio blind plate thickness of described blind plate ring, the width of blind plate ring is than flange seal face width 10mm; Described sealing gasket adopts immersion oil packing to be wound around and makes, and the packing number of winding is no less than 2 circles, and packing interface adopts 45 ° of oblique angles docking, and sealing gasket point is welded in to described blind plate ring both sides with iron wire;
Step 7. is parked in the crane that extracts blind plate the position of being convenient to lifting, hoisting rig is suspended on two hangers of blind plate, and on rigging, hangs up two chain blocks, to facilitate adjust hoisting angle and speed;
Newly-built pipeline is adopted nitrogen replacement by step 8., 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 bolt II that length is longer, and by nut and bolt II band buckle, then by all the other bolt I loosening dismounting one by one;
Step 10. is installed four jack that load is identical at support place, by jack, the flange of blind plate both sides is separated, and stops action in the time that the gap ejecting is 20mm; Wherein, the action of the flange of four jack separation blind plate both sides evenly, synchronously;
Step 11. is removed the jack at original pipeline and newly-built pipeline top, slightly prizes blind plate with explosion-proof crowbar, after blind plate is loosening, by chain block, blind plate is extracted out slowly, accessible after, crane hangs out blind plate to be put into appointed place;
For step 12., explosion-proof scraper cleaning flange facing, packs blind plate ring and the sealing gasket made into, and penetrates bolt I after cleaning out, and then removes its excess-three platform jack, the bolt II of flange bottom is replaced by bolt I, then even clamping bolt I; Wherein, after cleaning out, in the middle of described flange, install blind plate ring and the sealing gasket corresponding with described blind plate thickness;
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 has docked with original pipeline;
Step 14. site clearing, dismantling operation platform and passway for escaping, withdraw scene; Wherein, band coal gas takes out that blind plate construction is complete, and described original pipeline and described newly-built pipeline mating operation finish, and described newly-built pipeline can put into operation after displacement assay is qualified.
2. band coal gas according to claim 1 is taken out blind plate method of construction, it is characterized in that: described bolt II is than the long 30～50mm of bolt I.
3. band coal gas according to claim 1 is taken out 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 true CN102927363B (en) | 2014-09-24 |
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