CN113305513A - On-site factory manufacturing construction method for circulating water pipeline - Google Patents
On-site factory manufacturing construction method for circulating water pipeline Download PDFInfo
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- CN113305513A CN113305513A CN202110640816.0A CN202110640816A CN113305513A CN 113305513 A CN113305513 A CN 113305513A CN 202110640816 A CN202110640816 A CN 202110640816A CN 113305513 A CN113305513 A CN 113305513A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 115
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000005096 rolling process Methods 0.000 claims abstract description 16
- 238000004080 punching Methods 0.000 claims abstract description 11
- 238000005452 bending Methods 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 241000219109 Citrullus Species 0.000 claims abstract description 4
- 235000012828 Citrullus lanatus var citroides Nutrition 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 38
- 238000007689 inspection Methods 0.000 claims description 16
- 239000003973 paint Substances 0.000 claims description 16
- 238000005488 sandblasting Methods 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 8
- 238000005536 corrosion prevention Methods 0.000 claims description 6
- 238000009417 prefabrication Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000011900 installation process Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 4
- 238000009659 non-destructive testing Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 230000037452 priming Effects 0.000 claims description 2
- 238000009439 industrial construction Methods 0.000 claims 9
- 238000009776 industrial production Methods 0.000 claims 9
- 238000012545 processing Methods 0.000 abstract description 4
- 238000000227 grinding Methods 0.000 abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
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- 239000013589 supplement Substances 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
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- 239000000498 cooling water Substances 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
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- 238000010892 electric spark Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention provides a site factory manufacturing construction method for a circulating water pipeline, which relates to the technical field of pipeline manufacturing and comprises the following steps: lofting and blanking, calculating the blanking length according to the specification 1:1 of the steel pipe, marking and marking the two sides of the steel plate according to the expansion length, then measuring the length of the diagonal line of the steel plate, and punching lofting punching holes at the height points of the lofted watermelon peel through lofting punching; processing a groove, namely, adopting a semi-automatic plasma groove blanking machine for a blanking straight edge of an elbow pipe fitting, manually cutting the groove for a curve part, and grinding the curve part by using an angular grinder; rolling the pipe fitting, namely hoisting a steel plate onto a plate bending machine by using a crane, and starting the plate bending machine to rotate a roller to perform pressing when an upper roller presses down to a certain radian so as to form the pipe fitting; assembling the pipe fittings, wherein the pipe fittings are butted with the pipe fittings, and longitudinal welding seams of the butted pipe fittings are arranged in a staggered mode when being butted and are arranged on the same pipe joint; and (3) welding, namely welding on a rolling operation tool platform, and performing integral rotation and next welding once one section is welded so as to enable the section to be in a flat welding position for welding.
Description
Technical Field
The invention relates to the technical field of pipeline manufacturing, in particular to a construction method for on-site factory manufacturing of a circulating water pipeline.
Background
The circulating water pipeline bears the task of providing most of cooling water for the thermal power plant unit in the operation of the thermal power plant unit, and is also a system with the largest water supplement amount for the thermal power plant, and the stability of the operation of the circulating water pipeline system is directly related to the stability of the whole unit.
In some areas with less developed technologies, the local and even peripheral countries do not have the capacity of producing large-scale steel members, for example, some overseas countries are particularly important in how to form factory processing and manufacturing capacity in the first time when the local production construction site is not available.
Disclosure of Invention
The invention aims to provide a construction method for on-site factory manufacturing of a circulating water pipeline, which is used for realizing on-site factory manufacturing of the pipeline and is convenient for achieving the technical effect of being suitable for some special areas.
The invention is realized by the following technical scheme;
the method comprises the following steps:
s1 lofting and blanking
Calculating the blanking length according to the specification 1:1 of the steel pipe, marking and marking the two sides of the steel plate according to the expansion length, measuring the length of the diagonal line of the steel plate, and punching sample punching holes at the height points of the lofted watermelon peels through sample punching;
s2 groove preparation
The blanking straight edge of the elbow pipe fitting adopts a semi-automatic plasma groove blanking machine, the curve part adopts a manual groove cutting method and is polished by an angular grinder;
s3 pipe rolling
Hoisting a steel plate onto a plate bending machine by using a crane, enabling the end of the steel plate to be 250mm away from a central pressing roller, starting a rotating roller of the plate bending machine to lift and press when an upper roller is pressed to a certain radian, and forming a pipe fitting;
s4 pipe fitting assembly
The pipe fitting and the pipe fitting are butted, longitudinal welding seams of the butted pipe fitting are arranged in a staggered mode when being butted, and the distance between the two longitudinal welding seams on the same pipe joint is not smaller than 300 mm;
s5 welding
And welding on a rolling operation tool platform, wherein when one section is welded, the whole rotation is carried out, and then the next section of welding is carried out, so that the welding tool is always in the optimal flat welding position.
In order to better implement the present invention, further, the deviation of the diagonal length in the step S1 is less than 2mm, and the deviation of the deployed length is less than ± 1 mm.
In order to better implement the present invention, in step S2, the processed groove is subjected to scale removal with a flat shovel and a wire brush, and the uneven groove is polished and leveled with a portable angle grinder.
In order to better implement the present invention, further, in step S2, the end face of the butt pipe orifice of the elbow pipe should be perpendicular to the centerline of the pipe, and the skewness thereof is not greater than 2 mm.
To better implement the present invention, step S3: after the pipe is rolled by the plate rolling machine, the clearance adjustment is carried out after the barrel is rolled and formed, the spot welding is firm, the integral roundness of the pipe is adjusted by the plate rolling machine after the spot welding, and the roundness of the pipe is controlled to be less than or equal to 0.003 DN.
In order to better implement the method, in step S4, oxide skin, rust, oil stains, and impurities thereof within a range of 15-20 mm on each of two sides of the weld groove are cleaned before welding, and the groove is polished to have metallic luster.
In order to better implement the present invention, further, in step S5, during the welding process, when the welding process is used for facilitating the alignment in the later installation process, deformation control and roundness adjustment are performed, and a longitudinal seam end of about 150mm is reserved in each pipe joint and is not welded first.
In order to better implement the invention, further, the method further comprises the following steps of installing the rigid ring:
polishing and derusting the mounting position of the rigid ring on the coiled pipeline, and then mounting the rigid ring;
the welding of the rigid ring is full welding, the size of a welding leg is not less than 6mm, and the longer position of the longitudinal joint of the rigid ring and the rolled pipeline needs to be polished to smooth the welding joint.
In order to better implement the invention, the rigid ring is further subjected to post-welding nondestructive testing before being mounted.
In order to better realize the invention, the method further comprises the following steps of sand blasting, painting and corrosion prevention:
the specific steps are as follows in sequence: spraying surface inspection, priming paint, acceptance inspection, intermediate paint, acceptance inspection, finishing paint, acceptance inspection and prefabrication completion;
before sand blasting, the impurities remained on the surface need to be clear, and the impurities are welding slag, welding beading or splashing.
The invention has the beneficial effects that: the method carries out on-site factory manufacturing on the circulating water pipeline through the steps of lofting, blanking, groove processing, pipe rolling, pipe assembling and welding, and the working procedures are mutually cooperated, so that the construction period is saved, the engineering cost is reduced, and the method is particularly suitable for places with relatively laggard technologies, such as Cambodia.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
the invention provides a site factory manufacturing construction method of a circulating water pipeline, which mainly comprises the following steps:
s1: lofting and blanking;
s2: groove machining;
s3: rolling the pipe fitting;
s4: assembling pipe fittings;
s5: welding process;
s6: nondestructive testing after welding;
s7: mounting a rigid ring;
s8: sand blasting, painting and corrosion prevention.
Before S1 lofting and blanking, the early-stage layout work is firstly carried out,
the earlier stage arrangement work is specifically as follows: the method is designed according to project conditions, wherein the site is arranged, the site is reasonably planned and arranged according to the requirements of the process characteristics, quality, safety, construction period and the like of circulating water pipe processing, the prefabrication and corrosion prevention of the pipeline are carried out on the site, and construction machines, material yards, welding equipment and the like are arranged according to the requirements of a standard section general arrangement diagram.
Sufficient illumination and complete power supply are required in a construction site, and measures such as wind shielding, rain prevention, moisture prevention and the like are adopted in a welding operation site.
Preparation of materials:
the preparation of the material mainly comprises the steps of welding the prefabricated circulating water pipeline, the size of the prefabricated circulating water pipeline is preferably ID2620x14mm, the usage amount of the steel plate and the usage amount of the reinforcing ribs are calculated according to the normal loss characteristic of blanking, in the embodiment of the invention, the protection welding adopted by the circulating water pipeline is carbon dioxide protection welding, and the welding wire adopted by the circulating water pipeline is Atlantic ER50-6 solid welding wire.
According to the storage capacity, the entry plan of the materials is reasonably arranged, the situation that workers are lost due to the influence of the materials is prevented, and other consumed materials, such as carbon rods, polishing sheets, secondary protective welding gun accessories and the like, need to be strictly controlled, so that artificial waste is prevented.
Preparing a machine tool:
the machine tool equipment mainly used in the welding prefabrication process of the circulating water pipeline in the embodiment comprises a gantry crane, a plate rolling machine, a plasma flame groove blanking machine, a carbon dioxide gas shielded welding machine, an inverter direct current welding machine, an air compressor, sand blasting and paint spraying equipment.
Preparing before welding:
carry out reasonable design according to the specification and size of preparation tubular product, the prefabricated mouth of rational utilization, the installing port of minimizing, because the aperture ratio of some prefabricated pipelines is great, reduce a trench installing port and just can practice thrift a large amount of manual works and consumptive material.
The S1 lofting and blanking specifically comprises the following operations:
calculating the blanking length according to the specification 1:1 of the steel pipe, marking and marking the two sides of the steel plate according to the expansion length, and then measuring that the diagonal length deviation is not more than 2mm, and the expansion length deviation is less than +/-1 mm. And punching the sample on the height points of the set watermelon peel after the test is qualified, and punching the sample on the holes.
The specific operation of the groove machining of S2 is as follows:
the blanking straight edge of the elbow pipe fitting adopts a semi-automatic plasma groove blanking machine, the groove is manually cut at the curved part and then polished by an angular grinder, in the manufacturing process, the circular seams can not be formed in sequence, the longitudinal seams are cut when a steel pipe is to be rolled, V-shaped with truncated edges is adopted when the wall thickness is between 10mm and 20mm, and the gap, the width, the angle and the like of the butt joint are executed according to the drawing.
Removing oxide skin of the processed groove by using a flat shovel and a steel wire brush, and polishing the uneven groove by using a portable angle grinder until the groove is qualified.
The specific operation of rolling the S3 pipe fitting is as follows:
and hoisting the steel plate to the plate bending machine by using a crane, enabling the end of the steel plate to be 250mm away from the central pressing roller, and starting a rotating roller of the plate bending machine to press when the upper roller is pressed to a certain radian.
The steel plate with certain radian can be controlled by using a steel plate test paper with the same thickness and width before construction to ensure the pressing depth of the lower roller and mark on the plate bending machine, the radian of the steel plate is measured by using a sample plate, and the clearance between the sample plate and the steel plate is less than 2mm, so that the steel plate is qualified.
And after the cylinder of the pipe fitting is rolled and formed, gap adjustment is carried out, spot welding is carried out in time firmly, forced opening alignment is avoided before spot welding for reducing internal stress generated by opening alignment of the steel pipe, the integral roundness of the pipeline can be adjusted again by using a plate bending machine after spot welding, and the integral roundness of the pipeline is controlled to be less than or equal to 0.003 DN.
The specific operation of assembling the S4 pipe fitting is as follows:
the pipe fitting and the pipe fitting are butted, the longitudinal welding seams of the butted pipe fitting are staggered when being butted, the longitudinal welding seams are placed at the position of 45 degrees or so of a semicircle on the central vertical line of the pipeline, and the distance between the two longitudinal welding seams is not less than 300mm on the same pipe joint.
The method is carried out on a platform in the process of assembling the pipe fittings, when pipe end notches of butt-jointed pipe fittings are not matched with each other, the difference value is not more than one fourth of the thickness of the pipe wall, the gap is forbidden to be reduced by a method of flattening or stretching a steel pipe by strong external force or heating, the angle deviation of the end face of an elbow is less than or equal to 2mm (DN is less than or equal to 5m), the difference between the measured perimeter of the elbow and the designed perimeter is less than or equal to +/-4 mm, and the difference between the perimeters of adjacent pipe sections is less than or equal to 6 mm.
Cleaning oxide skin, rust, oil stain and other sundries in the range of 15-20 mm on each of two sides of a welding seam groove before welding, polishing the groove to form metal luster, enabling the bevel face to meet the requirements, and carrying out anti-rust protection on the bevel face if the pipeline subjected to spot welding cannot be welded in time.
S5: the welding process comprises the following specific operation steps:
and welding on a rolling operation tool platform, wherein when one section is welded, the whole rotation is carried out, and then the next section of welding is carried out, so that the welding tool is always in the optimal flat welding position.
When mainly in dry season during circulating water pipeline welding construction in this embodiment, have the characteristics of rain less and windy, consequently mainly consider the windproof measures, carbon dioxide gas shielded arc welds the regional wind speed and must not be greater than 2m/s, the welding area adopts three proofings oilcloth or various steel tile to set up the windproof welding worker canopy of large tracts of land according to the wind direction characteristics, the canopy whole frame is set up with the scaffold, the size is 10x4x4m, the concatenation department gap between the canopy wall needs to seal the laminating, should not leave big clearance, take movable ceiling at the top, make things convenient for the pipeline section hoist and mount business turn over, if still should consider effectual rainproof measure simultaneously under rainy season or rainy environment.
For the humid condition with the relative humidity more than 90 percent, oxyacetylene flame can be adopted to heat the surface of the groove to achieve the effects of dehumidification and water vapor, and each welding point is partially shielded or sealed according to the microclimate condition.
In the welding process, the distance between the carbon dioxide gas shielded welding contact tip and the base metal is generally 10-15 times of the diameter of the welding wire; when the welding wire is used for vertical welding and overhead welding, and welding of a welding bead on the surface of a transverse welding seam of a butt joint, the diameter of the welding wire is 1.2mm, the welding current is 120-240A, the arc voltage is increased, the width of the welding seam can be remarkably increased, and the gas flow is generally 10-25L/min. The higher the welding current, the higher the welding speed. During overhead welding, a large gas flow is adopted, the purity of carbon dioxide gas is not less than 99.5%, and the water content is not more than 0.005%.
In order to facilitate deformation control and roundness adjustment in the installation process, the end of a longitudinal seam with the thickness of about 150mm is reserved in each standard section, welding is not carried out, multiple welding is carried out according to the characteristic of 14mm thickness, bottoming, filling and covering are carried out for 1 path respectively, and then the welding sequence of 1 path at the root is carried out after the back is subjected to carbon arc gouging.
The pipe hole is prevented from being opened on the welding seam, and the pipe hole connecting pipe welding seam is prevented from being overlapped with a heat affected zone of the adjacent welding seam. When holes are required to be formed on or near the welding seams, the welding seams with the hole diameter larger than the hole diameter and not smaller than 60 mm around the pipe holes are qualified through nondestructive inspection.
When the local gap of the crater is too large, a method should be tried to trim and adjust to a specified size, the filling materials are strictly forbidden to be added in the gap, except for designing a specified cold-drawing crater, other craters should be forbidden to conduct strong opening alignment, opening alignment by a thermal expansion method is not allowed, when a welded joint has a defect exceeding a standard, repairing can be conducted by adopting an excavation and repair mode, but the excavation and repair times on the same position generally do not exceed 2 times.
S6: post-weld nondestructive testing
According to the No. 5 part of the DL/T5210.5-2018 electric power construction quality acceptance regulation: according to the regulations of welding articles and DLT 869-2012 welding technical regulations of thermal power plants, gas, water, oil and gas pipelines with the working pressure of 0.1MPa and p of less than or equal to 1.6MPa are tested according to III-grade welding seams, and the proportion of radiographic inspection is 1%. In the control of the quality of the welding seam, particularly, the T-shaped head part of the intersection of the longitudinal seam and the circular seam is the important part for monitoring, the ray inspection at least reaches the qualification of grade III sheets specified by DL/T821-2017, if the ray inspection result is unqualified, the unqualified welding seam needs to be repaired, and the repaired welding opening needs to be inspected again.
The scheme of replacing a field hydraulic test scheme with 100% ultrasonic detection of a butt weld and 100% penetration detection of a fillet weld specified by GB 50184 plus 2011 Industrial Metal pipeline engineering construction quality acceptance Standard can be adopted, so that the butt weld can be detected in time and integrally preserved in the prefabrication process, the subsequent preservation operation under the severe environment of a pipe trench is reduced, the procedure of the hydraulic test is reduced in the installation process, and the purposes of timely installation, timely detection, timely backfilling and timely release of a working face can be achieved.
S7: the specific operation of the rigid ring mounting is as follows:
before installation, polishing and derusting are carried out on the position where the rigid ring is in contact with the pipeline, the rigid ring is installed in a full-welding mode, the size of a welding leg is not smaller than 6mm, the cross position of the rigid ring and the longitudinal seam of the rolled pipeline needs to be polished to level the welding seam, and stress concentration caused by the cross welding seam is avoided.
After the steel pipes form pipe joints, deformation of the steel pipes in the transportation and installation process is considered, after the rigid ring is welded, temporary angle steel supports at partial pipe orifice parts can be reserved if necessary, after the rigid ring welding is finished, the whole pipe section is checked and accepted before sand blasting is carried out, and sand blasting and corrosion prevention operation procedures are carried out after the rigid ring welding is qualified.
S8 concrete operation of sand blasting paint and corrosion prevention is as follows:
the sand blasting treatment is carried out according to the designed standard: sand blasting surface inspection → primer → acceptance inspection → intermediate paint → acceptance inspection → top paint → inspection acceptance → prefabrication completion. Before sand blasting, sundries such as welding slag, welding flash, splashing and the like remained on the surface of the workpiece need to be removed. Before spraying, dry compressed air is used for blowing and cleaning large-area floating dust.
The relative humidity of air is not more than 85%, the surface temperature of the coated substrate is lower than the dew point by 3 ℃, the environmental temperature is preferably 5-35 ℃, and open-air coating operation can not be carried out in rainy or foggy days; the spraying operation is carried out in a clean environment, so that pollution of the undried coating by dust is avoided; smoking and other open fire operations are strictly prohibited in an operation environment, so that the contact with other high-temperature heat sources is avoided; the good ventilation of the working environment is ensured, but proper measures are required to be taken when the wind power exceeds six levels, and the coating cannot be carried out when the surface of the component has dew condensation.
The quality requirement is to meet the relevant requirements in the specification of the steel pipe anticorrosion or the specification of a paint manufacturer, and the appearance of the steel pipe anticorrosion paint does not have the defects of shrinkage cavity, shrinkage edge, foaming, spinning, whitening and delustering, floating color, sagging, color bleeding, undercut, wrinkled skin, orange peel and the like; the dry film should not have whitening, pinhole, fine chap, sticky back, peeling, etc.
After the coating is naturally dried, the thickness is detected by a paint film thickness meter, according to two 90% principles, according to the thickness detection method specified in the national relevant standard GB/T6463-1986, the thickness measurement method comments of metal and other inorganic covering layer thickness, the thickness is detected and measured by a magnetic thickness meter, 90% of the values of the measured points of the thickness of the paint film on the surface of the circulating water pipe must reach or exceed the specified paint film thickness value, and the value of the measured points which do not reach the specified film thickness must not be lower than 90% of the specified film thickness requirement.
And inspecting the pinholes by using an electric spark leak detector, and if the pinholes are found, polishing the pinholes by using a grinding machine and performing coating supplement until the pinholes are qualified. Re-constructing the coating damage part in the hoisting and transporting processes according to the original process; and (3) damaging the part which does not reach the base body, manually polishing the damaged part into a slope, constructing according to the original working procedure, damaging several layers, repairing several layers, and overlapping each new coating and each old coating by at least 30 mm. The local small-area injury patient uses manual grinding to repair.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A construction method for on-site factory manufacturing of a circulating water pipeline is characterized by comprising the following steps:
s1 lofting and blanking
Calculating the blanking length according to the specification 1:1 of the steel pipe, marking and marking the two sides of the steel plate according to the expansion length, measuring the length of the diagonal line of the steel plate, and punching sample punching holes at the height points of the lofted watermelon peels through sample punching;
s2 groove preparation
The blanking straight edge of the elbow pipe fitting adopts a semi-automatic plasma groove blanking machine, the curve part adopts a manual groove cutting method and is polished by an angular grinder;
s3 pipe rolling
Hoisting a steel plate onto a plate bending machine by using a crane, enabling the end of the steel plate to be away from a central pressing roller, and starting a rotating roller of the plate bending machine to press when an upper roller presses down to a certain radian so as to form a pipe fitting;
s4 pipe fitting assembly
The pipe fitting and the pipe fitting are butted, longitudinal welding seams of the butted pipe fitting are arranged in a staggered mode when being butted, and the distance between the two longitudinal welding seams on the same pipe joint is not smaller than 300 mm;
s5 welding
And (3) welding on a rolling operation tool platform, wherein when one section is welded, the whole rotation is carried out, and then the next section of welding is carried out, so that the welding is in a flat welding position for welding.
2. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 1,
the deviation of the diagonal length in the step S1 is less than 2mm, and the deviation of the deployed length is less than ± 1 mm.
3. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 1,
in the step S2, the oxide skin of the machined groove is removed by a flat shovel and a steel wire brush, and the uneven groove is polished to be flat by a portable angle grinder.
4. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 3,
in the step S2, the end face of the butt joint pipe orifice of the elbow pipe fitting should be perpendicular to the center line of the pipeline, and the skewness thereof is not greater than 2 mm.
5. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 4,
in the step S3, after rolling by the plate rolling machine, the barrel is rolled and formed, gap adjustment is performed, spot welding is performed firmly, after spot welding, the integral roundness of the pipeline is adjusted by the plate rolling machine, and the roundness of the pipeline is controlled to be less than or equal to 0.003 DN.
6. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 1,
in the step S4, oxide skin, rust, oil stain and sundries thereof within the range of 15-20 mm on each of two sides of the welding seam groove are cleaned before welding, and the groove is polished to form metallic luster.
7. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 6,
in the step S5, during the welding process, when the pipe joint is aligned in the later installation process, deformation control and roundness adjustment are performed, and a longitudinal seam end of about 150mm is reserved in each pipe joint and is not welded.
8. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 1,
further comprising the steps of rigid ring installation:
polishing and derusting the mounting position of the rigid ring on the coiled pipeline, and then mounting the rigid ring;
the welding of the rigid ring is full welding, the size of a welding leg is not less than 6mm, and the longer position of the longitudinal joint of the rigid ring and the rolled pipeline needs to be polished to smooth the welding joint.
9. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 8,
and performing post-welding nondestructive testing before the rigid ring is installed.
10. The method for the on-site industrial production and construction of the circulating water pipeline according to claim 8 or 9,
also comprises the following steps of sand blasting paint and corrosion prevention:
the specific steps are as follows in sequence: spraying surface inspection, priming paint, acceptance inspection, intermediate paint, acceptance inspection, finishing paint, acceptance inspection and prefabrication completion;
before sand blasting, the impurities remained on the surface need to be clear, and the impurities are welding slag, welding beading or splashing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116475701A (en) * | 2023-05-16 | 2023-07-25 | 河北宏源特钢管业集团有限公司 | Industrial prefabrication method of pipeline |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204988280U (en) * | 2015-07-24 | 2016-01-20 | 邓绍云 | Arbitrary transmission line engineering in simple and convenient high -efficient plane surveys and establishes device |
| CN109955038A (en) * | 2017-12-26 | 2019-07-02 | 东莞市广信知识产权服务有限公司 | A kind of manufacture craft of sealing pipeline |
| CN112570998A (en) * | 2020-12-06 | 2021-03-30 | 中国二冶集团有限公司 | Manufacturing process method of air cooling pipeline of thermal generator set |
| CN113104173A (en) * | 2021-05-17 | 2021-07-13 | 江南造船(集团)有限责任公司 | Ship bilateral push outer plate installation lofting design method |
| WO2021189217A1 (en) * | 2020-03-23 | 2021-09-30 | 江苏鹏飞集团股份有限公司 | Welding process method suitable for rolling of ultra-thick stainless steel composite plates |
-
2021
- 2021-06-09 CN CN202110640816.0A patent/CN113305513A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204988280U (en) * | 2015-07-24 | 2016-01-20 | 邓绍云 | Arbitrary transmission line engineering in simple and convenient high -efficient plane surveys and establishes device |
| CN109955038A (en) * | 2017-12-26 | 2019-07-02 | 东莞市广信知识产权服务有限公司 | A kind of manufacture craft of sealing pipeline |
| WO2021189217A1 (en) * | 2020-03-23 | 2021-09-30 | 江苏鹏飞集团股份有限公司 | Welding process method suitable for rolling of ultra-thick stainless steel composite plates |
| CN112570998A (en) * | 2020-12-06 | 2021-03-30 | 中国二冶集团有限公司 | Manufacturing process method of air cooling pipeline of thermal generator set |
| CN113104173A (en) * | 2021-05-17 | 2021-07-13 | 江南造船(集团)有限责任公司 | Ship bilateral push outer plate installation lofting design method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116475701A (en) * | 2023-05-16 | 2023-07-25 | 河北宏源特钢管业集团有限公司 | Industrial prefabrication method of pipeline |
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Application publication date: 20210827 |