CN118128963A - Method for installing and constructing gas construction pipelines between towns - Google Patents
Method for installing and constructing gas construction pipelines between towns Download PDFInfo
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- CN118128963A CN118128963A CN202410213737.5A CN202410213737A CN118128963A CN 118128963 A CN118128963 A CN 118128963A CN 202410213737 A CN202410213737 A CN 202410213737A CN 118128963 A CN118128963 A CN 118128963A
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000003466 welding Methods 0.000 claims abstract description 85
- 238000009434 installation Methods 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000009412 basement excavation Methods 0.000 claims abstract description 23
- 238000005260 corrosion Methods 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims description 219
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 20
- 238000005536 corrosion prevention Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 10
- 210000001503 joint Anatomy 0.000 claims description 10
- 239000002689 soil Substances 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 6
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000010892 electric spark Methods 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000010426 asphalt Substances 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 claims description 3
- 239000004567 concrete Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000002360 explosive Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002349 favourable effect Effects 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 239000003345 natural gas Substances 0.000 description 8
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses a method for installing and constructing a gas construction pipeline between towns, and relates to the technical field of gas pipeline installation. S1, determining paving positions of towns, and excavating pipeline grooves at corresponding positions; s2, selecting a corresponding gas pipeline to be paved in a groove at a corresponding position according to the excavation position; s3, performing butt welding operation on the laid gas pipeline; s4, carrying out anti-corrosion treatment on the welded junction of the gas pipeline; s5, mounting a valve on the welded gas pipeline; the invention can carry out corresponding paving construction on town gas pipelines, is favorable for carrying out construction operation on different paving road sections, and improves the quality of gas pipeline paving groove excavation and gas pipeline paving installation, thereby improving the quality of gas pipeline paving installation, reducing the conditions of water seepage, gas leakage and fracture of the gas pipeline, improving the effect of gas pipeline installation construction and prolonging the service life of the gas pipeline.
Description
Technical Field
The invention relates to the technical field of gas pipeline installation, in particular to an inter-town gas construction pipeline installation construction method.
Background
Natural gas pipelines refer to pipelines that transport natural gas (including associated gas from oilfield production) from a production site or process plant to a municipal gas distribution center or industrial enterprise user, also known as gas pipelines. Natural gas is conveyed by utilizing a natural gas pipeline, and the natural gas is conveyed on land in a large quantity. The natural gas pipeline accounts for about half of the total length of the world pipeline. The natural gas pipeline transportation has the advantages of low transportation cost, small occupied area, quick construction, large oil and gas transportation quantity, high safety performance, less transportation loss, no three wastes discharge, less leakage danger, less environmental pollution, less influence on severe weather, less equipment maintenance quantity, convenient management, easy realization of remote centralized monitoring and the like.
The current Chinese patent with the publication number of CN201910075067.4 discloses a gas pipeline construction method, and a mountain is blasted to form a pipeline mounting hole, so that a pipeline passes through the mountain without climbing along the mountain, the height difference of the gas pipeline in the vertical direction is prevented from being greatly increased, the energy loss of additionally increasing the gas transmission pressure is reduced, the condition that the consumption of the pipeline is greatly increased is reduced, and the energy conservation and consumption reduction are realized.
At present, most cities and towns need to use natural gas for life, but in the comparison document, the condition that the consumption of the pipeline can be greatly increased can be reduced, so that energy is saved, consumption is reduced, but in the installation process, the device cannot be well correspondingly installed according to the position of the gas pipeline, the quality of the gas pipeline is affected, the safety and the service life of the subsequent use of the gas pipeline are affected, and the effect of the gas pipeline installation construction is reduced.
Disclosure of Invention
The invention provides a method for installing and constructing a gas construction pipeline between towns, which has the advantage of improving the safety of paving the gas pipeline between towns, thereby solving the problems in the background technology.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the method for installing and constructing the gas construction pipelines between towns comprises the steps of S1, determining paving positions of towns, and excavating pipeline grooves at corresponding positions; s2, selecting a corresponding gas pipeline to be paved in a groove at a corresponding position according to the excavation position; s3, performing butt welding operation on the laid gas pipeline; s4, carrying out anti-corrosion treatment on the welded junction of the gas pipeline; s5, mounting a valve on the welded gas pipeline; s6, installing a drainer on the gas pipeline; s7, installing a diffusing pipe on the gas pipeline, and testing the installation of the gas pipeline after the integral installation of the underground gas pipeline is completed; s9, performing quality inspection on welding of the underground gas pipeline; s10, laying and backfilling the grooves after the underground gas pipeline is detected to meet the standard; and S11, finally, checking and accepting the installation quality of the underground gas pipeline, and finishing the inspection according with the standard.
The S1, town paving positions are determined, and the excavation of the pipeline trench, including S101, the concrete pavement and the asphalt pavement, is carried out at the corresponding positions by using a cutting machine; s102, excavating a pipeline groove according to the plane position and the elevation specified by design, wherein when artificial excavation is adopted and no underground water is adopted, the reserved value of the groove bottom is preferably 0.0-0.10 m, and when mechanical excavation or underground water is adopted, the reserved value of the groove bottom is not less than 0.15m; and the pipeline should be manually cleaned to the design elevation before installation; s103, determining the width of the bottom of the pipe trench and the size of the working pit according to the actual situation of the site and the pipeline laying method; s104, backfilling and compacting the local overexcavation part, wherein when no underground water exists at the bottom of the ditch, the overexcavation is less than 0.15m, and original soil backfilling can be adopted; the overbreak is more than or equal to 0.15m, lime soil can be adopted for treatment, and grading sand stone or natural sand is adopted for backfilling to the designed elevation when the underground water or the water content of the ditch bottom is large.
The S2, selecting the corresponding gas pipeline to be paved in the groove at the corresponding position according to the excavation position comprises the step S201 that the underground gas pipeline cannot be paved from the lower part of a building and a large-scale structure; s202, burying thickness of an underground gas pipeline: 1) not less than 0.9m, 2) when buried under a motor vehicle lane, not less than 0.6m,3 when buried under a non-motor vehicle lane (including a sidewalk), not less than 0.3m,4 when buried in a place where a motor vehicle is not likely to reach, and not less than 0.8m when buried under a paddy field; s203, the underground gas pipeline cannot pass through the ground where flammable and explosive materials and corrosive liquids are accumulated, is not suitable for being laid along with other pipelines or cables, and effective safety protection measures must be adopted when the pipeline is required to be laid along the same trench; s204, in the laying process of the underground gas pipeline, the gas pipeline adopts a corresponding laying method according to the position where the gas pipeline passes through.
The S3 is that the welding operation of the laid gas pipeline is carried out in a butt joint mode, including S301, in a construction site, a pipeline groove is usually cut by hand or a semi-automatic gas cutting machine matched with a portable beveling machine to form a groove, and when the gas cutting is adopted, oxide skin on the groove surface is required to be removed and polished, and the surface is required to be flat; s302, a method of aligning circles is usually adopted by fixing the aligning device and aligning the chain hoist pipe, so that strong aligning is not needed; s302, longitudinally welding the two pipelines during the alignment, wherein the distance is not less than 100mm arc length, and the inner walls after the alignment are flush; s304, immediately performing positioning welding after the butt joint is finished, wherein the welding rod for positioning welding is the same as the welding rod for welding a pipe orifice, the thickness of the positioning welding is similar to that of the first layer of the groove, but the thickness of the positioning welding does not exceed 70% of the thickness of the pipe wall, the root of the welding seam is required to be thoroughly welded, the positioning welding is uniform and symmetrical, the total length is not less than 50% of the total length of a welding bead, and the end part of the longitudinal welding seam of the steel pipe cannot be subjected to positioning welding; s305, dismantling the butt joint device after the positioning welding is finished, numbering welded junctions, and welding the good junctions in the same day; s306, welding according to a process method determined by trial welding, wherein argon arc welding is generally adopted for bottoming, and welding rod arc welding is adopted for filling and capping. The steel pipe adopts a single-sided welding and double-sided forming method, the welding layer number is determined according to the wall thickness and the groove form of the steel pipe, and the welding layer number with the wall thickness below 5mm is not less than two layers.
The S4 is used for carrying out anti-corrosion treatment on welded junctions of the gas pipelines; s401, performing joint coating corrosion prevention after on-site nondestructive inspection and sectional strength test, and removing rust on the surface of the steel pipe before corrosion prevention, wherein the grade of the steel pipe is not lower than the grade Sa2.5; s402, before the repaired mouth is preserved, rust on straight pipe sections on two sides of the welded mouth is removed completely, the metal natural color is presented, the preserved building is found out, and the repaired mouth is treated by using a pipeline preserved material; s403, after the welded junction is preserved, an electric spark leak detector is used for checking, and when a breakdown pinhole appears, reinforced preservation is needed and records are made; s404, adopting a cold coating mode for corrosion prevention of the elbow and the welding seam, wherein the thickness and the number of corrosion prevention layers are the same as those of the straight pipe section, and detecting by an electric spark instrument after the surface layer of the corrosion prevention layer is solidified for 2 hours; s405, the appearance inspection requires that the coating has a flat surface, uniform color, no bubbles, no cracking and no shrinkage; s406, the fixing opening adopts a radiation crosslinked polyethylene heat shrinkage sleeve and an epoxy resin radiation crosslinked polyethylene heat shrinkage sleeve three-layer structure.
The S5, the installation of the valve for the welded gas pipeline comprises the step S501 of detecting the quality qualification of the valve; s502, the installation position is convenient to operate and maintain, meanwhile, the assembly appearance is attractive, the valve hand wheel cannot be downward, face-facing operation is avoided, and the floor valve hand wheel cannot be upward and inclined.
As the method for installing and constructing the gas construction pipelines between towns, the S6 is used for installing the drainer on the gas pipelines, wherein the S601 is used for installing the drainer at the lowest part of the pipeline, so that the collected water or oil is discharged.
The S7 of the method for installing the gas pipeline between towns comprises the step of installing the gas pipeline on an outdoor pipeline or an outdoor diffusing channel on the inner side of an important pipeline, and guiding and discharging the gas.
As a construction method for installing the gas construction pipelines between towns, in the paving process of the S204 and the underground gas pipelines, the gas pipelines adopt corresponding paving methods according to the paving passing positions, wherein the paving method comprises the steps that when M1, the underground gas pipelines pass through drainage ditches, heating pipelines, comprehensive pipe galleries, tunnels and other ditches with various purposes, the gas pipelines are laid in the sleeve, the horizontal clearance between the gas pipelines extending out of the outer wall of a structure and the structure, which is not smaller than the standard, is not required, and the two ends of the sleeve are sealed by adopting flexible anti-corrosion and waterproof materials; m2, the gas pipeline should meet the following requirements when passing through railways, highways, tramways and town main thoroughfares: 1) The outer parts of the gas pipelines penetrating through railways and highways are provided with sleeves, and the insulation and corrosion resistance levels are improved; 2) The sleeve of the gas pipeline crossing the railway meets the following requirements: a1, the embedded depth of the sleeve meets the requirements of railway management departments; a2, the sleeve is preferably a steel pipe or a reinforced concrete pipe; a3, the inner diameter of the sleeve is more than 100mm larger than the outer diameter of the gas pipeline; a4, the gaps between the two ends of the sleeve and the gas pipe are sealed by adopting flexible anti-corrosion and waterproof materials, and a leakage detection pipe is arranged at one end of the sleeve; a5, the distance between the end part of the sleeve and the outer side of the slope toe of the embankment is not smaller than 2.0m; m3, the gas pipeline is preferably laid in a sleeve or a pipe ditch when passing through a trolley track or a main road of a town; the sleeve of the gas pipeline passing through the expressway, the sleeve or the pipe canal of the gas pipeline passing through the tramway or the main road of the town should meet the following requirements: b1, the inner diameter of the sleeve is more than 100mm larger than the outer diameter of the gas pipeline, two ends of the sleeve or the pipe ditch are sealed, and a leakage detection pipe is arranged at the end part of the sleeve or the pipe ditch in an important section; b2, the distance between the end of the sleeve or the pipe ditch and the side rail of the electric lane is not less than 2.0m, and the distance between the end of the sleeve or the pipe ditch and the edge of the road is not less than 1.0m; m4, when the gas pipeline passes through the river, the pipeline adopts a mode of crossing the river bottom or crossing a pipe bridge, and when the condition permits, the pipeline and the bridge can also be used for crossing the river, and the value meets the following requirements: c1, utilizing a road and a bridge to span a river, wherein the conveying pressure of the pipeline is not more than 0.4MPa; c2, when the gas pipeline is laid along with a bridge or a pipe bridge is adopted to cross a river, safety protection measures are required to be adopted; m5, when the gas pipeline passes through the river bottom, the following requirements are met: d1, the gas pipeline is preferably a steel pipe; d2, the covering soil thickness from the gas pipeline to the planned river bottom is determined according to the water flow flushing condition, and the dredging and anchoring depth requirements for the navigable river are met; d3, the pipe stabilizing measures are determined according to calculation; d4, setting marks on the upper and lower sides of the river at the position where the gas pipeline is buried; d5, the error caused by butt joint installation of the gas pipeline is not more than 3 degrees, otherwise, an elbow pipe is arranged, and the blind plate force is considered for the elbow pipe of the secondary high-pressure gas pipeline.
The invention provides a method for installing and constructing a gas construction pipeline between towns. The beneficial effects are as follows:
According to the method for installing and constructing the gas construction pipelines between towns, the corresponding paving construction can be carried out on the gas pipelines in towns, the construction operation is facilitated on different paving road sections, the quality of the gas pipeline paving groove excavation and the gas pipeline paving installation is improved, the quality of the gas pipeline paving installation is improved, the conditions of water seepage, gas leakage and fracture of the gas pipeline are reduced, the effect of the gas pipeline installing and constructing is improved, and the service life of the gas pipeline is prolonged.
Drawings
FIG. 1 is a flow chart of a town gas pipe installation construction method of the present invention;
FIG. 2 is a flow chart of the pipeline trench excavation of the present invention;
FIG. 3 is a gas pipeline laying flow chart of the present invention;
FIG. 4 is a flow chart of the pipe butt weld operation of the present invention;
FIG. 5 is a flow chart of the pipe weld corrosion protection process of the present invention;
FIG. 6 is a flow chart of the gas pipeline valve installation of the present invention;
FIG. 7 is a flow chart of the gas pipeline drainer installation of the invention;
FIG. 8 is a flow chart of the installation of the gas pipeline diffusing pipe of the present invention;
FIG. 9 is a flow chart of a corresponding laying method of laying a gas pipeline at different pass-through locations in accordance with the present invention;
FIG. 10 is a schematic diagram of the gas pipeline pressure according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 10, the present invention provides a technical solution: s1, determining paving positions of towns, and excavating pipeline grooves at corresponding positions; s2, selecting a corresponding gas pipeline to be paved in a groove at a corresponding position according to the excavation position; s3, performing butt welding operation on the laid gas pipeline;
S4, carrying out anti-corrosion treatment on the welded junction of the gas pipeline; s5, mounting a valve on the welded gas pipeline; s6, installing a drainer on the gas pipeline; s7, installing a diffusing pipe on the gas pipeline, and testing the installation of the gas pipeline after the integral installation of the underground gas pipeline is completed; s9, performing quality inspection on welding of the underground gas pipeline; s10, laying and backfilling the grooves after the underground gas pipeline is detected to meet the standard; s11, finally, checking and accepting the installation quality of the underground gas pipeline, checking and conforming to the standard, and can carry out corresponding paving construction on town gas pipelines, so that the construction operation on different paving road sections is facilitated, the quality of the gas pipeline paving and installing trench excavation and the gas pipeline paving is improved, the quality of the gas pipeline paving and installing is improved, the conditions of water seepage, gas leakage and fracture of the gas pipeline are reduced, the effect of the gas pipeline installing and constructing is improved, and the service life of the gas pipeline is prolonged.
Referring to fig. 2, S1, determining a town paving position, and performing excavation including S101, a concrete pavement and an asphalt pavement in a pipeline trench excavation at a corresponding position by using a cutter; s102, excavating a pipeline groove according to the plane position and the elevation specified by design, wherein when artificial excavation is adopted and no underground water is adopted, the reserved value of the groove bottom is preferably 0.0-0.10 m, and when mechanical excavation or underground water is adopted, the reserved value of the groove bottom is not less than 0.15m; and the pipeline should be manually cleaned to the design elevation before installation; s103, determining the width of the bottom of the pipe trench and the size of the working pit according to the actual situation of the site and the pipeline laying method; s104, backfilling and compacting the local overexcavation part, wherein when no underground water exists at the bottom of the ditch, the overexcavation is less than 0.15m, and original soil backfilling can be adopted; the super-excavation is more than or equal to 0.15m, lime soil can be adopted for treatment, grading sand stone or natural sand is adopted for backfilling to a designed elevation when underground water or water content is large at the bottom of a ditch, corresponding ditch excavation can be carried out on a road surface through the arrangement of S101-S104, the quality of ditch excavation is improved, the subsequent paving effect of a gas pipeline is improved, and the probability of gas pipeline paving damage is reduced.
Referring to fig. 3, S2, selecting a corresponding gas pipeline to be laid in a trench at a corresponding position according to the excavation position includes S201 that the underground gas pipeline must not be laid from below the building and the large-scale structure; s202, burying thickness of an underground gas pipeline: 1) not less than 0.9m, 2) when buried under a motor vehicle lane, not less than 0.6m,3 when buried under a non-motor vehicle lane (including a sidewalk), not less than 0.3m,4 when buried in a place where a motor vehicle is not likely to reach, and not less than 0.8m when buried under a paddy field; s203, the underground gas pipeline cannot pass through the ground where flammable and explosive materials and corrosive liquids are accumulated, is not suitable for being laid along with other pipelines or cables, and effective safety protection measures must be adopted when the pipeline is required to be laid along the same trench; s204, in the paving process of the underground gas pipeline, the gas pipeline adopts a corresponding paving method according to the paving passing position, and through the arrangement of S201-S204, the gas pipeline can be paved and adjusted according to the paving road position, so that the gas pipeline is better paved and protected.
Referring to fig. 4, S3, performing butt welding operation on a laid gas pipeline includes S301, in a construction site, chamfering a pipeline groove by adopting a manual gas cutting or a semi-automatic gas cutting machine together with a portable chamfering machine, and when gas cutting is adopted, removing oxide skin on the surface of the groove and polishing the surface to be flattened; s302, a method of aligning circles is usually adopted by fixing the aligning device and aligning the chain hoist pipe, so that strong aligning is not needed; s302, longitudinally welding the two pipelines during the alignment, wherein the distance is not less than 100mm arc length, and the inner walls after the alignment are flush; s304, immediately performing positioning welding after the butt joint is finished, wherein the welding rod for positioning welding is the same as the welding rod for welding a pipe orifice, the thickness of the positioning welding is similar to that of the first layer of the groove, but the thickness of the positioning welding does not exceed 70% of the thickness of the pipe wall, the root of the welding seam is required to be thoroughly welded, the positioning welding is uniform and symmetrical, the total length is not less than 50% of the total length of a welding bead, and the end part of the longitudinal welding seam of the steel pipe cannot be subjected to positioning welding; s305, dismantling the butt joint device after the positioning welding is finished, numbering welded junctions, and welding the good junctions in the same day; s306, welding according to a process method determined by trial welding, wherein argon arc welding is generally adopted for bottoming, and welding rod arc welding is adopted for filling and capping. The steel pipe adopts a single-sided welding and double-sided forming method, the number of welding layers is determined according to the wall thickness and the groove form of the steel pipe, the number of welding layers with the wall thickness below 5 mm is not less than two, and through the arrangement of S301-S306, the corresponding welding treatment can be carried out on the joint for paving the gas pipeline, so that the quality of paving connection of the gas pipeline is improved, and the possibility of subsequent gas leakage of the gas pipeline is reduced.
Referring to fig. 5, S4, performing corrosion protection treatment on the welded junction of the gas pipeline; s401, performing joint coating corrosion prevention after on-site nondestructive inspection and sectional strength test, and removing rust on the surface of the steel pipe before corrosion prevention, wherein the grade of the steel pipe is not lower than the grade Sa2.5; s402, before the repaired mouth is preserved, rust on straight pipe sections on two sides of the welded mouth is removed completely, the metal natural color is presented, the preserved building is found out, and the repaired mouth is treated by using a pipeline preserved material; s403, after the welded junction is preserved, an electric spark leak detector is used for checking, and when a breakdown pinhole appears, reinforced preservation is needed and records are made; s404, adopting a cold coating mode for corrosion prevention of the elbow and the welding seam, wherein the thickness and the number of corrosion prevention layers are the same as those of the straight pipe section, and detecting by an electric spark instrument after the surface layer of the corrosion prevention layer is solidified for 2 hours; s405, the appearance inspection requires that the coating has a flat surface, uniform color, no bubbles, no cracking and no shrinkage; s406, the fixing port adopts a radiation crosslinked polyethylene heat shrinkage sleeve and an epoxy resin radiation crosslinked polyethylene heat shrinkage sleeve three-layer structure, and through the arrangement of S401-S406, the welding seam of the gas pipeline can be subjected to corrosion prevention treatment, so that the sealing performance of the welding port of the gas pipeline is improved, and the service life of the gas pipeline is prolonged.
Referring to fig. 6, S5, the step of installing the valve on the welded gas pipeline includes S501, performing quality qualification detection on the valve; s502, the installation position should be convenient to operate and maintain, and simultaneously the assembly appearance is attractive, the valve hand wheel is not required to be downward, the face-facing operation is avoided, the floor valve hand wheel is not required to be upward, and the fuel gas pipeline valve is required to be inclined, and through the arrangement of S501 and S502, the corresponding installation can be carried out on the fuel gas pipeline valve, and the effect of the installation and the use of the valve is improved.
Referring to fig. 7, S6, a certain gradient is formed when the installation of the drainer for the gas pipeline includes S601 and pipeline laying, and the drainer is arranged at the lowest position, so that collected water or oil is discharged, and water or oil generated in the gas pipeline can be conveniently discharged through the arrangement of S601, so that the use effect of the gas pipeline is improved.
Referring to fig. 8, S7, the installation of the diffusing pipe for the gas pipeline includes S701, where the diffusing pipe is installed on the outdoor pipeline or the diffusing channel outside the inner side of the important pipeline, and the gas is guided to be discharged, so that the redundant gas generated in the gas pipeline can be discharged through the arrangement of S701, and the use safety of the gas pipeline is improved.
Referring to fig. 9, in the laying process of the gas pipeline in S204, when the gas pipeline passes through the drain pipe ditch, the heating pipe ditch, the utility tunnel, the tunnel and other various grooves, the gas pipeline should be laid in the sleeve, the horizontal clearance between the gas pipeline extending out of the outer wall of the structure and the structure, which is specified by the specification, should not be smaller than the horizontal clearance between the gas pipeline and the structure, and the two ends of the sleeve should be sealed by adopting flexible anti-corrosion and waterproof materials; m2, the gas pipeline should meet the following requirements when passing through railways, highways, tramways and town main thoroughfares: 1) The outer parts of the gas pipelines penetrating through railways and highways are provided with sleeves, and the insulation and corrosion resistance levels are improved; 2) The sleeve of the gas pipeline crossing the railway meets the following requirements: a1, the embedded depth of the sleeve meets the requirements of railway management departments; a2, the sleeve is preferably a steel pipe or a reinforced concrete pipe; a3, the inner diameter of the sleeve is more than 100mm larger than the outer diameter of the gas pipeline; a4, the gaps between the two ends of the sleeve and the gas pipe are sealed by adopting flexible anti-corrosion and waterproof materials, and a leakage detection pipe is arranged at one end of the sleeve; a5, the distance between the end part of the sleeve and the outer side of the slope toe of the embankment is not smaller than 2.0m;
M3, the gas pipeline is preferably laid in a sleeve or a pipe ditch when passing through a trolley track or a main road of a town; the sleeve of the gas pipeline passing through the expressway, the sleeve or the pipe canal of the gas pipeline passing through the tramway or the main road of the town should meet the following requirements: b1, the inner diameter of the sleeve is more than 100mm larger than the outer diameter of the gas pipeline, two ends of the sleeve or the pipe ditch are sealed, and a leakage detection pipe is arranged at the end part of the sleeve or the pipe ditch in an important section; b2, the distance between the end of the sleeve or the pipe ditch and the side rail of the electric lane is not less than 2.0m, and the distance between the end of the sleeve or the pipe ditch and the edge of the road is not less than 1.0m; m4, when the gas pipeline passes through the river, the pipeline adopts a mode of crossing the river bottom or crossing a pipe bridge, and when the condition permits, the pipeline and the bridge can also be used for crossing the river, and the value meets the following requirements: c1, utilizing a road and a bridge to span a river, wherein the conveying pressure of the pipeline is not more than 0.4MPa; c2, when the gas pipeline is laid along with a bridge or a pipe bridge is adopted to cross a river, safety protection measures are required to be adopted; m5, when the gas pipeline passes through the river bottom, the following requirements are met: d1, the gas pipeline is preferably a steel pipe; d2, the covering soil thickness from the gas pipeline to the planned river bottom is determined according to the water flow flushing condition, and the dredging and anchoring depth requirements for the navigable river are met; d3, the pipe stabilizing measures are determined according to calculation; d4, setting marks on the upper and lower sides of the river at the position where the gas pipeline is buried; d5, the error that gas pipeline butt joint installation arouses must not be greater than 3, otherwise should set up the return bend, and the return bend of next high pressure gas pipeline should consider blind plate power, through the setting of M1-M5, can be according to the mode of pipeline laying of the different types of road to can install the construction with gas pipeline in different road positions, improve gas pipeline laying's quality.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the novel concept of the present invention, can be equivalently replaced or changed within the scope of the present invention.
Claims (9)
1. The method for installing and constructing the gas construction pipeline between towns is characterized by comprising the following steps of:
S1, determining town paving positions, and excavating pipeline grooves at corresponding positions;
S2, selecting a corresponding gas pipeline to be paved in a groove at a corresponding position according to the excavation position;
s3, performing butt welding operation on the laid gas pipeline;
S4, carrying out anti-corrosion treatment on the welded junction of the gas pipeline;
S5, mounting a valve on the welded gas pipeline;
s6, installing a drainer on the gas pipeline;
S7, installing a diffusing pipe on the gas pipeline;
S8, after the integral installation of the underground gas pipeline is completed, testing the installation of the gas pipeline;
S9, performing quality inspection on welding of the underground gas pipeline;
S10, laying and backfilling the grooves after the underground gas pipeline is detected to meet the standard;
and S11, finally, checking and accepting the installation quality of the underground gas pipeline, and finishing the inspection according with the standard.
2. The method for installing and constructing the inter-town gas construction pipeline according to claim 1, wherein the method comprises the following steps: the S1, determining the paving position of the town, and excavating the pipeline trench at the corresponding position comprises
S101, excavating concrete pavement and asphalt pavement by using a cutting machine;
S102, excavating the pipeline groove according to the plane position and the elevation specified by design, wherein when artificial excavation is adopted and no underground water is arranged, the reserved value of the groove bottom is preferably 0.0-0.10 m,
When mechanical excavation or underground water is adopted, the reserved value of the bottom of the tank is not less than 0.15m; and the pipeline should be manually cleaned to the design elevation before installation;
S103, determining the width of the bottom of the pipe trench and the size of the working pit according to the actual situation of the site and the pipeline laying method;
S104, backfilling and compacting the local overexcavation part, wherein when no underground water exists at the bottom of the ditch, the overexcavation is less than 0.15m, and original soil backfilling can be adopted; the overbreak is more than or equal to 0.15m, lime soil can be adopted for treatment,
When underground water or water content is large at the bottom of the ditch, graded sand stone or natural sand should be adopted to backfill to the designed elevation.
3. The method for installing and constructing the inter-town gas construction pipeline according to claim 1, wherein the method comprises the following steps: s2, according to the excavation position, selecting a corresponding gas pipeline to be paved in a groove at the corresponding position, wherein the gas pipeline comprises
S201, underground gas pipelines cannot be paved from the lower parts of buildings and large structures in a penetrating way;
s202, burying thickness of an underground gas pipeline:
1) When buried under the motor vehicle lane, the thickness of the steel sheet is not less than 0.9m,
2) When buried under a non-motor vehicle lane (including a sidewalk), the thickness of the material is not less than 0.6m,
3) When buried in places where the motor vehicle cannot reach, the thickness of the material must not be less than 0.3m,
4) When buried in paddy fields, the thickness of the soil is not less than 0.8m;
S203, the underground gas pipeline cannot pass through the ground where flammable and explosive materials and corrosive liquids are accumulated, is not suitable for being laid along with other pipelines or cables, and effective safety protection measures must be adopted when the pipeline is required to be laid along the same trench;
S204, in the laying process of the underground gas pipeline, the gas pipeline adopts a corresponding laying method according to the position where the gas pipeline passes through.
4. The method for installing and constructing the inter-town gas construction pipeline according to claim 1, wherein the method comprises the following steps: s3, performing butt welding operation on the laid gas pipeline comprises
S301, in a construction site, a pipeline groove is usually chamfered by adopting a manual gas cutting machine or a semi-automatic gas cutting machine matched with a portable beveling machine, and when the gas cutting is adopted, oxide skin on the surface of the groove is required to be removed and polished, so that the surface is flattened;
s302, a method of aligning circles is usually adopted by fixing the aligning device and aligning the chain hoist pipe, so that strong aligning is not needed;
S302, longitudinally welding the two pipelines during the alignment, wherein the distance is not less than 100 mm arc length, and the inner walls after the alignment are flush;
S304, immediately performing positioning welding after the butt joint is finished, wherein the welding rod for positioning welding is the same as the welding rod for welding a pipe orifice, the thickness of the positioning welding is similar to that of the first layer of the groove, but the thickness of the positioning welding does not exceed 70% of the thickness of the pipe wall, the root of the welding seam is required to be thoroughly welded, the positioning welding is uniform and symmetrical, the total length is not less than 50% of the total length of a welding bead, and the end part of the longitudinal welding seam of the steel pipe cannot be subjected to positioning welding;
s305, dismantling the butt joint device after the positioning welding is finished, numbering welded junctions, and welding the good junctions in the same day;
S306, welding according to a process method determined by trial welding, wherein argon arc welding is generally adopted for bottoming, and welding rod arc welding is adopted for filling and capping. The steel pipe adopts a single-sided welding and double-sided forming method, the welding layer number is determined according to the wall thickness and the groove form of the steel pipe, and the welding layer number with the wall thickness below 5mm is not less than two layers.
5. The method for installing and constructing the inter-town gas construction pipeline according to claim 1, wherein the method comprises the following steps: s4, carrying out anti-corrosion treatment on the welded junction of the gas pipeline;
S401, performing joint coating corrosion prevention after on-site nondestructive inspection and sectional strength test, and removing rust on the surface of the steel pipe before corrosion prevention, wherein the grade of the steel pipe is not lower than the grade Sa2.5;
s402, before the repaired mouth is preserved, rust on straight pipe sections on two sides of the welded mouth is removed completely, the metal natural color is presented, the preserved building is found out, and the repaired mouth is treated by using a pipeline preserved material;
S403, after the welded junction is preserved, an electric spark leak detector is used for checking, and when a breakdown pinhole appears, reinforced preservation is needed and records are made;
S404, adopting a cold coating mode for corrosion prevention of the elbow and the welding seam, wherein the thickness and the number of corrosion prevention layers are the same as those of the straight pipe section, and detecting by an electric spark instrument after the surface layer of the corrosion prevention layer is solidified for 2 hours;
S405, the appearance inspection requires that the coating has a flat surface, uniform color, no bubbles, no cracking and no shrinkage;
S406, the fixing opening adopts a radiation crosslinked polyethylene heat shrinkage sleeve and an epoxy resin radiation crosslinked polyethylene heat shrinkage sleeve three-layer structure.
6. The method for installing and constructing the inter-town gas construction pipeline according to claim 1, wherein the method comprises the following steps: the step S5 of installing the valve of the welded gas pipeline comprises the following steps of
S501, detecting quality qualification of the valve;
S502, the installation position is convenient to operate and maintain, meanwhile, the assembly appearance is attractive, the valve hand wheel cannot be downward, face-facing operation is avoided, and the floor valve hand wheel cannot be upward and inclined.
7. The method for installing and constructing the inter-town gas construction pipeline according to claim 1, wherein the method comprises the following steps: the S6, the subsequent mounting of the drainer on the gas pipeline comprises
And S601, a certain gradient exists during pipeline laying, and a drainer is arranged at the lowest position, so that collected water or oil is drained.
8. The method for installing and constructing the inter-town gas construction pipeline according to claim 1, wherein the method comprises the following steps: the S7 step of installing the diffusing pipe on the gas pipeline comprises
S701, the diffusing pipe is arranged on an outdoor pipeline or an outdoor diffusing channel at the inner side of an important pipeline to guide and discharge gas.
9. The method for installing and constructing the inter-town gas construction pipeline according to claim 1, wherein the method comprises the following steps: s204, in the laying process of the underground gas pipeline, the gas pipeline adopts a corresponding laying method according to the position where the gas pipeline passes through, wherein the method comprises the following steps of
M1, when the underground gas pipeline passes through the drain pipe ditch, the heating pipe ditch, the comprehensive pipe gallery, the tunnel and other grooves with various purposes, the gas pipeline is laid in the sleeve, the sleeve extends out of the outer wall of the structure and is not smaller than the horizontal clear distance between the gas pipeline and the structure specified by the specification, and the two ends of the sleeve are sealed by adopting flexible anti-corrosion and waterproof materials;
m2, the gas pipeline should meet the following requirements when passing through railways, highways, tramways and town main thoroughfares:
1) The outer parts of the gas pipelines penetrating through railways and highways are provided with sleeves, and the insulation and corrosion resistance levels are improved;
2) The sleeve of the gas pipeline crossing the railway meets the following requirements:
a1, the embedded depth of the sleeve meets the requirements of railway management departments;
a2, the sleeve is preferably a steel pipe or a reinforced concrete pipe;
A3, the inner diameter of the sleeve is more than 100 mm larger than the outer diameter of the gas pipeline;
A4, the gaps between the two ends of the sleeve and the gas pipe are sealed by adopting flexible anti-corrosion and waterproof materials, and a leakage detection pipe is arranged at one end of the sleeve;
A5, the distance between the end part of the sleeve and the outer side of the slope toe of the embankment is not smaller than 2.0m;
m3, the gas pipeline is preferably laid in a sleeve or a pipe ditch when passing through a trolley track or a main road of a town;
The sleeve of the gas pipeline passing through the expressway, the sleeve or the pipe canal of the gas pipeline passing through the tramway or the main road of the town should meet the following requirements:
B1, the inner diameter of the sleeve is more than 100 mm larger than the outer diameter of the gas pipeline, two ends of the sleeve or the pipe ditch are sealed, and a leakage detection pipe is arranged at the end part of the sleeve or the pipe ditch in an important section;
B2, the distance between the end of the sleeve or the pipe ditch and the side rail of the electric lane is not less than 2.0m, and the distance between the end of the sleeve or the pipe ditch and the edge of the road is not less than 1.0m;
m4, when the gas pipeline passes through the river, the pipeline adopts a mode of crossing the river bottom or crossing a pipe bridge, and when the condition permits, the pipeline and the bridge can also be used for crossing the river, and the value meets the following requirements:
c1, utilizing a road and a bridge to span a river, wherein the conveying pressure of the pipeline is not more than 0.4MPa;
c2, when the gas pipeline is laid along with a bridge or a pipe bridge is adopted to cross a river, safety protection measures are required to be adopted;
m5, when the gas pipeline passes through the river bottom, the following requirements are met:
d1, the gas pipeline is preferably a steel pipe;
D2, the covering soil thickness from the gas pipeline to the planned river bottom is determined according to the water flow flushing condition, and the dredging and anchoring depth requirements for the navigable river are met;
d3, the pipe stabilizing measures are determined according to calculation;
D4, setting marks on the upper and lower sides of the river at the position where the gas pipeline is buried;
D5, the error caused by butt joint installation of the gas pipeline is not more than 3 degrees, otherwise, an elbow pipe is arranged, and the blind plate force is considered for the elbow pipe of the secondary high-pressure gas pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410213737.5A CN118128963A (en) | 2024-02-27 | 2024-02-27 | Method for installing and constructing gas construction pipelines between towns |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410213737.5A CN118128963A (en) | 2024-02-27 | 2024-02-27 | Method for installing and constructing gas construction pipelines between towns |
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