CN113700987A - Manufacturing and mounting method of direct-buried prefabricated steam insulation pipe - Google Patents
Manufacturing and mounting method of direct-buried prefabricated steam insulation pipe Download PDFInfo
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- CN113700987A CN113700987A CN202111022723.8A CN202111022723A CN113700987A CN 113700987 A CN113700987 A CN 113700987A CN 202111022723 A CN202111022723 A CN 202111022723A CN 113700987 A CN113700987 A CN 113700987A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000009413 insulation Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 238000010276 construction Methods 0.000 claims abstract description 34
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 238000000576 coating method Methods 0.000 claims abstract description 33
- 238000004321 preservation Methods 0.000 claims abstract description 25
- 238000009434 installation Methods 0.000 claims abstract description 19
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 8
- 230000002421 anti-septic effect Effects 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims description 106
- 239000003365 glass fiber Substances 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 12
- 239000004593 Epoxy Substances 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 8
- 239000011229 interlayer Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000010953 base metal Substances 0.000 claims description 3
- 239000011280 coal tar Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 239000003063 flame retardant Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 2
- 239000012790 adhesive layer Substances 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims description 2
- 238000005536 corrosion prevention Methods 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 239000011294 coal tar pitch Substances 0.000 claims 2
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 239000005030 aluminium foil Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000009933 burial Methods 0.000 description 3
- 239000011300 coal pitch Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
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
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/15—Arrangements for the insulation of pipes or pipe systems for underground pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
- F16L59/00—Thermal insulation in general
- F16L59/08—Means for preventing radiation, e.g. with metal foil
-
- 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
- F16L59/00—Thermal insulation in general
- F16L59/12—Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating material; Arrangements specially adapted for supporting insulated bodies
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention discloses a method for manufacturing and installing a direct-buried prefabricated steam heat-insulation pipe, which comprises the following steps: installation directly buried support includes: checking each clamp of the direct-buried support; the working pipe provided with the composite heat-insulating layer is arranged in the direct-buried bracket and fixed; adopt joint coating construction installation work pipe, include: sequentially assembling, installing and welding each working pipe section of the working pipe, and performing nondestructive testing on each welding line at the welding line; carrying out heat preservation joint coating treatment on the exposed part of each welding part; adopt joint coating construction installation outer tube, include: sequentially assembling, installing and welding the steel sleeve sections of the outer sleeve, wherein two positions are formed by adopting split type blanking joint coating construction welding, and the rest steel sleeve sections are formed by adopting pipe dragging joint coating construction welding; carrying out nondestructive testing on each welding seam at the welding seam; and performing antiseptic treatment on the repaired mouth of the outer sleeve. The invention greatly reduces the work load of joint coating welding, effectively improves the joint coating quality and reduces the construction cost.
Description
Technical Field
The invention belongs to the technical field of low-energy-consumption long-distance heat supply network steam pipeline transportation, and particularly relates to a manufacturing and installing method of a direct-buried prefabricated steam heat-insulation pipe.
Background
With the deep promotion of national energy saving and emission reduction work, the construction of a centralized heat supply project is greatly promoted in all regions, the centralized heat supply is divided into civil heating hot water heat supply and industrial steam heat supply, and the arrangement modes of pipelines are 3: overhead laying, trench laying and direct-buried laying. Because the technology of the prefabricated direct-buried heat insulation pipe is mature, most of heat supply network pipelines in special fields relating to roads, enterprise gates, residential areas, planning requirements and the like are buried underground, meanwhile, the buried pipelines do not occupy the ground space, and a long-distance direct-buried pipeline laying mode is adopted in many areas.
Aiming at the prior common steel sleeve steel steam direct-buried prefabricated pipeline, particularly when the pipeline is continuously and directly buried and laid in a long distance, the joint coating construction of the steel outer protecting pipe is troublesome, the welding workload is large, the construction efficiency is low, and the construction cost is high.
Meanwhile, the installation and construction of pressure pipelines built in China or in the process of building are in an irregular stage, so that a plurality of unscientific and unreasonable places exist, the manufacturing process is complicated, the manufacturing cost is high, and the construction quality is easy to cause problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for manufacturing and installing the direct-buried prefabricated steam insulation pipe can reduce the number of welding seams at the repaired mouth, further improve the repaired mouth quality and the construction efficiency and reduce the welding workload and the construction cost.
The invention is realized by the following steps: a method for manufacturing and installing a direct-buried prefabricated steam insulation pipe comprises the following steps:
a. installation directly buried support includes:
a1, checking each hoop of the direct-buried bracket to ensure that a first preset condition is reached;
a2, installing the working pipe provided with the composite heat-insulating layer into the direct-buried bracket and completing fixation to ensure that the working pipe reaches a second preset condition after installation;
b. adopt joint coating construction installation work pipe, include:
b1, assembling, installing and welding the working pipe sections of the working pipe in sequence,
b2, performing nondestructive testing on each welding seam, and performing the next procedure after the welding seams are qualified;
b3, performing heat preservation joint coating treatment on the exposed parts of the welding positions to form a composite heat preservation layer, wherein the structure of the composite heat preservation layer is the same as that of the working pipe;
c. adopt joint coating construction installation outer tube, include:
c1, sequentially assembling, installing and welding the steel sleeve sections of the outer sleeve, wherein the two positions are formed by welding the split blanking repaired mouths, and the rest steel sleeve sections are formed by welding the dragging repaired mouths;
c2, carrying out nondestructive testing on the welding seams, and carrying out the next procedure after the welding seams are qualified;
c3, performing antiseptic treatment on the repaired mouth of the outer sleeve.
Further, the first preset condition is that: the soft interlayer of each hoop in the direct-buried bracket is attached in the middle, and the two end parts of the hoop are connected with fastening bolts in series; the second preset condition is as follows: the soft interlayer of each hoop is attached in the middle, the bolt is fastened, and the two sides of the hoop are symmetrical and are provided with the equal-height parallel working pipes.
Further, the composite heat-insulating layer on the working pipe is arranged in the following mode:
the heat-insulating layer is provided with a plurality of layers, staggered joints are arranged among the heat-insulating layers, the size of a pressed joint is 1/2 heat-insulating layers, and a reflecting layer is wrapped outside each heat-insulating layer; the reflecting layer is spirally wound on the heat insulation layer in the reflecting layer, and the blank pressing length is 30-50 mm;
the pipe end of the working pipe is reserved with the length of the non-wrapped heat-insulating layer according to the following mode: when the diameter of the working pipe is less than or equal to 150mm, the pipe end remaining length is 150mm, when the diameter of the working pipe is 200-250 mm, the pipe end remaining length is 200mm, and when the diameter of the working pipe is more than or equal to 250mm, the pipe end remaining length is 250 mm;
the heat-insulating layer and the reflecting layer are both fixed by binding, the binding distance of the heat-insulating layer is 400mm,
when the diameter of the working pipe is smaller than 250mm, the binding distance of the reflecting layer is 300mm, and when the diameter of the working pipe is larger than or equal to 250mm, the binding distance of the reflecting layer is 400 mm.
Further, the reflecting layer sequentially comprises an aluminum foil layer, a flame-retardant adhesive layer and a glass fiber layer from inside to outside, and the aluminum foil layer is attached to the heat insulation layer inside the aluminum foil layer.
Further, the step of welding the working tube and the outer sleeve comprises:
preheating the end to be welded to 120-250 ℃,
filling and welding the root of the end to be welded, wherein the welding thickness is 6-10 mm, and then filling to finish the cover surface;
overlaying a cover surface to sequentially form a transition layer and a protective layer, wherein the transition layer is welded for 1-2 layers, and the protective layer is welded for 2-3 layers; when the transition layer is welded, the later welding seam covers at least 1/3 width of the former welding seam;
and after the coating is welded, the surface of the welding seam is polished to be in smooth transition with the surface of the corresponding base metal.
Further, the antiseptic treatment of the repaired mouth of the outer casing comprises the following steps:
coating first epoxy coal pitch on the outer surface of the outer sleeve, winding the glass fiber cloth soaked with the epoxy coal pitch on the outer surface of the outer sleeve according to the angle of a helical angle alpha, and scraping the glass fiber cloth to be flat along the axial direction by using a scraper blade while winding;
after surface drying, sequentially brushing a plurality of epoxy coal tar asphalts and a plurality of glass fiber cloths according to the same method;
and repairing the surface defects after finishing coating, and coating finish paint.
Further, the anti-corrosion treatment is carried out on the working pipe after the working pipe is welded, and the anti-corrosion treatment comprises the following steps:
the surface of the working pipe is sprayed by adopting an oiling spray gun, the distance between the touch nozzle and the surface of the working pipe is about 400mm, the spray nozzle moves uniformly during spraying, the speed is kept at 10-18 m/min, the air pressure is 0.4-0.7 MPa, and the thickness of the sprayed surface is 0.3-0.5 mm.
Further, the direct burial support comprises: the direct-buried bracket comprises a sliding bracket and a guide bracket;
the sliding support comprises a hoop I, a support, a sliding plate and a bottom plate, the bottom plate is welded on the inner side of the outer sleeve, the support is welded at the bottom of the hoop I, and the sliding plate is welded at the bottom of the support and is in sliding fit with the bottom plate;
the guide bracket comprises a clamp II and bracket round steel, the bracket round steel is provided with at least two, the inner ends of the bracket round steel are welded on the outer side of the clamp II, and the outer end of the bracket round steel is in sliding fit with the inner side of the outer sleeve.
Furthermore, the direct-buried support also comprises a fixed support, the fixed support is a conical structure, the large opening end of the fixed support is welded with the inner side of the outer sleeve, a heat-insulating layer is arranged on the outer side of the welding position, and the small opening end of the fixed support is welded with the outer side of the working pipe.
Further, the included angle between the generatrix of the fixed support and the axis of the fixed support is 30 degrees.
The invention has the following beneficial effects:
1. compared with the traditional construction technology, the method has the advantages of reasonable design of operation steps, simplicity in operation, safe and reliable engineering quality and reduction of engineering construction cost, and meanwhile, the method is convenient and fast to construct, short in construction period, capable of greatly reducing the workload of pipeline joint coating welding, capable of effectively improving the joint coating quality, reducing the construction cost and remarkable in economic benefit.
2. The composite heat-insulating layer can improve the heat-insulating capacity and reduce the heat loss.
3. The direct-buried support has various structural forms, can determine specific types according to pipe diameters and construction modes, ensures the alignment of the inner pipe and the outer pipe, and reduces construction difficulty and cost.
Drawings
FIG. 1 is a schematic illustration of piping assembly installation for conventional patching construction in the prior art;
FIG. 2 is a schematic illustration of the present invention in the installation of a working tube set pair;
FIG. 3 is a schematic view of the assembly of the outer sleeve of the present invention;
FIG. 4 is a schematic view of the mounting of the sliding bracket of the present invention;
FIG. 5 is a schematic cross-sectional view of a sliding support according to the present invention;
FIG. 6 is a schematic view of the mounting of the guide bracket of the present invention;
FIG. 7 is a schematic cross-sectional view of a guide bracket according to the present invention;
FIG. 8 is a schematic view of the mounting bracket of the present invention;
FIG. 9 is a schematic view of the heat-insulating structure of the present invention;
FIG. 10 is a schematic cross-sectional view of the heat retention of the present invention;
FIG. 11 is a view showing a structure of a reflective layer in the present invention;
FIG. 12 is a schematic view of the welding process of the present invention;
FIG. 13 is a schematic view of the outer sleeve corrosion prevention treatment in the present invention;
FIG. 14 is a schematic view of the construction of the segmented patch section of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in figure 1, a power plant newly builds a DN600 steam pipeline, the whole field is 18km, wherein 15km is laid in a direct-buried way. The specification of the working pipe of the direct-buried prefabricated pipeline is phi 630 multiplied by 10, the material is 20 steel, and the specification of the outer sleeve is phi 1220 multiplied by 10, and the material is Q235B. Taking a standard segment as an example, the first pipe segment 701 and the eighth pipe segment 708 of the outer sleeve have a length of 1.5m, the second pipe segment 702 has a length of 2m, the third pipe segment 703, the fourth pipe segment 704, the fifth pipe segment 705, the sixth pipe segment 706 and the seventh pipe segment 707 have a length of 12m, and the total length of the standard segment is 65 m. The exposed part of the pipe section at the welding position of the working pipe adopts a split blanking joint coating construction mode, so joint coating welding seams on the outer sleeve pipe are respectively as follows: h12 ', h23 ', h34 ', h45 ', h56 ', h67 ' and h78 '.
h 12' weld length is: 3.14 × 1220 × 2+3 × Δ l =3.14 × 1220 × 2+3 × 600mm =9462 mm; the total length of the repaired seam on the outer sleeve is 9462X 7mm =66234 mm.
As shown in fig. 2 to 14, the method for manufacturing and installing the direct-buried prefabricated steam insulation pipe comprises a working pipe 2, an outer sleeve 6, a direct-buried bracket 1 and a compensator 9. The installation method comprises the following steps:
a. the direct burial bracket 1 is installed, and the direct burial bracket 1 comprises a sliding bracket 101, a guide bracket 102 and a fixing bracket 109.
The sliding bracket 101 comprises a clamp I103a, a bracket 110, a sliding plate 107 and a bottom plate 106, wherein the bottom plate 106 is welded on the inner side of the outer sleeve 6, the bracket 110 is welded on the bottom of the clamp I103a, and the sliding plate 107 is welded on the bottom of the bracket 110 and is in sliding fit with the bottom plate 106.
The guide bracket 102 comprises a clamp II103b and bracket round steel 108, the bracket round steel 108 is provided with at least two, the inner ends of the bracket round steel 108 are welded on the outer side of the clamp II103b, and the outer ends of the bracket round steel 108 are in sliding fit with the inner side of the outer sleeve 6. The inner sides of the clamp I103a and the clamp II103b are both provided with soft spacers 104, and the two sides are connected through fastening bolts 105.
The fixing bracket 109 is a conical structure, the large opening end of the fixing bracket is welded with the inner side of the outer sleeve 6, the outer side of the welding position is provided with the heat preservation layer 3, and the small opening end of the fixing bracket is welded with the outer side of the working pipe 2. The generatrix of the fixed bracket 109 makes an angle of 30 ° with its axis.
The method comprises the following steps:
a1, checking whether the soft interlayer 104 of each hoop in the direct-buried bracket 1 is attached in the middle or not, connecting the fastening bolts 105 into the two ends of the hoop in series, and performing the next procedure if the check is qualified.
a2, loading the working pipe 2 provided with the composite heat-insulating layer into the direct-buried bracket 1, checking whether the soft interlayer 104 of each hoop is attached in the middle, and checking whether the fastening bolt 105 is screwed down and the working pipes 2 are symmetrically arranged at the same height on two sides, and performing the next procedure if the working pipes are qualified.
In the step a, the thickness of the circumference of the soft interlayer 104 is suppressed to be less than or equal to 10 mm; the diameter of the working pipe 2 is less than or equal to 125mm, the distance between the directly buried brackets 1 is 3.0m, the diameter of the working pipe 2 is more than 125mm, and the distance between the directly buried brackets 1 is 6.0 m; the sliding support 101 has a directional requirement to identify the direction within the end of the working tube 2.
b. The working pipe 2 is installed by adopting repaired mouth construction, and the working pipe 2 comprises a plurality of working pipe sections provided with composite heat-insulating layers, namely a first working pipe section 201, a second working pipe section 202, a third working pipe section 203, a fourth working pipe section 204, a fifth working pipe section 205, a sixth working pipe section 206, a seventh working pipe section 207 and an eighth working pipe section 208. The method comprises the following steps:
b1, sequentially assembling, installing and welding the working pipe sections of the working pipe 2, specifically: the inner pipe of the compensator 9 is connected to the second working pipe section 202, the first working pipe section 201 is taken as a first section on the left, all the working pipe sections are assembled, installed and welded from left to right in sequence, and welding seams H12, H23, H34, H45, H56, H67 and H78 are formed respectively.
b2, performing ray nondestructive testing on welding seams H12, H23, H34, H45, H56, H67 and H78, and performing the next procedure after the welding seams are qualified.
b3, performing heat preservation joint coating treatment on the exposed parts of the welding positions to form a composite heat preservation layer, wherein the structure of the composite heat preservation layer is the same as that of the working pipe 2. In order to improve the fireproof capacity of the repaired mouth, after the construction of the heat-preservation repaired mouth is completed, a fireproof layer is wrapped outside the composite heat-preservation layer at each heat-preservation repaired mouth, and the fireproof layers are firmly tied up through steel wires. The first work pipe section 201 and the eighth work pipe section 208 are both mounted in the fixed bracket 109.
As shown in fig. 9 to 11, the composite insulation layer includes a plurality of insulation layers 3 and a reflective layer 4, and the reflective layer 4 is wrapped around each insulation layer 3 and bound and fixed by a binding tape. The composite heat-insulating layer on the working pipe 2 is arranged in the following way:
the heat preservation layer 3 is provided with a plurality of layers, staggered joints are arranged among the heat preservation layers 3, the size of each pressed joint is 1/2 heat preservation layer 3, and the reflection layer 4 is wrapped outside each heat preservation layer 3; the reflecting layer 4 is spirally wound on the heat preservation layer 3 inside the reflecting layer, and the blank pressing length is 30-50 mm.
Reflecting layer 4 includes aluminium foil layer 401, fire-retardant gluing agent layer 402 and glass fiber layer 403 from inside to outside in proper order, and aluminium foil layer 401 laminates on its inside heat preservation 3, and reflecting layer 4 is spiral winding on its inside heat preservation 3, and the blank pressing is about 30~50mm, and reflecting layer 4's aluminium foil layer 401 is inwards.
The heat preservation layer 3 is bound by 16 # galvanized iron wires or stainless steel strips 5 at intervals of 400mm, the reflection layer 4 is bound by the stainless steel strips 5, the width of each stainless steel strip is 15-20 mm, the thickness of each stainless steel strip is 0.1-0.15 mm, the interval between the stainless steel strips 5 is 300mm when the diameter of the working pipe 2 is smaller than 250mm, and the interval between the stainless steel strips 5 is 400mm when the diameter of the working pipe 2 is larger than or equal to 250 mm. The length of the non-wrapped heat preservation layer 3 is reserved at the pipe end of the working pipe 2: the diameter of the working pipe 2 is less than or equal to 150mm, the pipe end is reserved for 150mm, the diameter of the working pipe 2 is within 200-250 mm, the pipe end is reserved for 200mm, and the diameter of the working pipe 2 is greater than or equal to 250mm, and the pipe end is reserved for 250 mm.
c. And an outer sleeve 6 is installed by adopting repaired mouth construction, and the outer sleeve 6 is coaxially arranged on the outer side of the working pipe 2. The outer sleeve 6 comprises a plurality of steel sleeve sections and two split type gap filling sections 610, the steel sleeve sections are respectively a first steel sleeve section 601, a second steel sleeve section 602, a third steel sleeve section 603, a fourth steel sleeve section 604, a fifth steel sleeve section 605, a sixth steel sleeve section 606, a seventh steel sleeve section 607, an eighth steel sleeve section 608 and a ninth steel sleeve section 609, wherein the eighth steel sleeve section 608 is a compensation section. As shown in fig. 14, 10 includes three arc-shaped pieces evenly divided in the circumferential direction, and are welded two by two in the circumferential direction. The method comprises the following steps:
c1, sequentially assembling and welding the steel sleeve sections of the outer sleeve 6, wherein two positions are formed by welding the split blanking repaired mouths, and the rest steel sleeve sections are formed by welding the dragging repaired mouths. Specifically, the method comprises the following steps: the first steel sleeve section 601 and the first working pipe section 201 are aligned in the center, the first steel sleeve section 601 and the second steel sleeve section 602 and the eighth steel sleeve section 608 and the ninth steel sleeve section 609 are connected in a split blanking joint repairing construction mode, namely, a split joint repairing section 610 is welded to each section, welding seams h12 and h89 are formed respectively, temporary pull lugs are welded to the rest of the steel sleeve sections, a pipe dragging joint repairing construction connection mode is adopted, namely, group-to-group installation welding is carried out after equipment such as an electric hoist is dragged from right to left in sequence, and welding seams h23, h34, h45, h56 and h67 are formed.
c2, carrying out ray nondestructive testing on welding seams h12, h23, h34, h45, h56, h67, h78 and h89, and carrying out the next procedure after the welding seams are qualified.
c3, performing antiseptic treatment on the repaired mouth of the outer sleeve 6, wherein the antiseptic treatment comprises the following steps:
the lengths of the first working pipe section 201, the second working pipe section 202, the third working pipe section 203, the fourth working pipe section 204, the fifth working pipe section 205, the sixth working pipe section 206, the seventh working pipe section 207 and the eighth working pipe section 208 are respectively equal to the lengths +. DELTA.l of the first steel casing pipe section 601, the second steel casing pipe section 602, the third steel casing pipe section 603, the fourth steel casing pipe section 604, the fifth steel casing pipe section 605, the sixth steel casing pipe section 606, the seventh steel casing pipe section 607 and the ninth steel casing pipe section 609. Generally, the delta l is 500-600 mm, the length of the eighth steel casing segment 608 is 5 delta l, the length of the fireproof layer is not less than delta l +200mm, and the distance of the fireproof layer extending into the inner portions of the outer sleeves 6 on the two sides is not less than 100 mm.
As shown in fig. 13, the prepared epoxidized bituminous coal is poured into the hopper of the traveling carriage 10.
Opening the roller frame 11, coating a first epoxy coal pitch on the outer surface of the outer sleeve 6, then immersing one end of the glass fiber cloth 12 into the hopper 13, pulling out the glass fiber cloth from the lower part of the roller of the hopper 13, adjusting the angle according to the spiral angle alpha, opening the roller frame 11 and the traveling trolley 10, and winding the glass fiber cloth 12 on the outer surface of the outer sleeve 6. While winding, the glass cloth 12 was smoothed by a squeegee in the axial direction. After surface drying, four epoxy coal tar asphalts and four glass fiber cloths 12 are sequentially coated according to the same method.
After finishing coating, repairing the surface defects after surface drying, and coating the finish paint to ensure that the surface is smooth and bright and has no sagging, bulging, wrinkles and white exposure.
As shown in fig. 12, the working tube 2 and the outer sleeve 6 are welded, and the welding of the working tube 2 is exemplified by the steps of:
preheating the end to be welded of the working pipe 2 at the temperature of 120-250 ℃.
And filling and welding the root of the end to be welded, wherein the welding thickness is 6-10 mm, and then filling to finish the cover surface.
Overlaying is carried out on the cover surface to sequentially form a transition layer 211 and a protective layer 212, wherein 1-2 layers of transition layer 211 are welded, and 2-3 layers of protective layer 212 are welded; the transition layer 211 is welded such that the subsequent weld covers at least 1/3 a width of the previous weld.
And after the coating is welded, the surface of the welding seam is polished to be in smooth transition with the surface of the corresponding base metal. For the welding of the working pipe 2, after filling welding is finished, post-heat treatment is carried out, the post-heat temperature is 150-250 ℃, and the heat preservation is carried out for 12 hours.
Carry out anticorrosive treatment to it after the working tube 2 welding, include: the surface of the working pipe 2 is sprayed by adopting an oiling spray gun, the distance between the touch nozzle and the surface of the working pipe 2 is about 400mm, the spray nozzle moves uniformly during spraying, the speed is kept at 10-18 m/min, the air pressure is 0.4-0.7 MPa, and the thickness of the sprayed surface is 0.3-0.5 mm.
As shown in fig. 3, the weld joints of the outer sleeve 6 required to be repaired are: h12, h23, h34, h45, h56, h67, h7 and h 8.
The length of the welding seams h12 and h89 is 9462 mm; the length of the welds h23, h34, h45, h56, h67, h78 is 3.14 × 1220mm =3831 mm; the total length of the repaired mouth welding seam of the outer sleeve 6 is 9462 multiplied by 2+3831 multiplied by 6mm =41910mm, compared with the prior art, the total length of the welding seam is reduced by 36.7%, the construction efficiency is greatly improved, the construction cost is reduced, the construction period is shortened, and the remarkable economic benefit is achieved.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for manufacturing and installing a direct-buried prefabricated steam insulation pipe is characterized by comprising the following steps: the method comprises the following steps:
a. installation directly buried support (1) includes:
a1, checking each hoop of the direct-buried bracket (1) to ensure that a first preset condition is reached;
a2, installing the working pipe (2) provided with the composite heat-insulating layer into the direct-buried bracket (1) and completing fixation to ensure that the working pipe reaches a second preset condition after installation;
b. adopt joint coating construction installation work pipe (2), include:
b1, sequentially assembling, installing and welding the working pipe sections of the working pipe (2),
b2, performing nondestructive testing on each welding seam, and performing the next procedure after the welding seams are qualified;
b3, performing heat preservation joint coating treatment on the exposed parts of the welding positions to form a composite heat preservation layer, wherein the structure of the composite heat preservation layer is the same as that of the composite heat preservation layer of the working pipe (2);
c. adopt joint coating construction installation outer tube (6), include:
c1, sequentially assembling, installing and welding the steel sleeve sections of the outer sleeve (6), wherein two positions are formed by welding and constructing a piece-separating blanking joint coating, and the rest steel sleeve sections are formed by welding and constructing a dragging pipe joint coating;
c2, carrying out nondestructive testing on the welding seams, and carrying out the next procedure after the welding seams are qualified;
c3, performing antiseptic treatment on the repaired mouth of the outer sleeve (6).
2. The method for manufacturing and installing the direct-buried prefabricated steam insulation pipe according to claim 1, wherein the first preset condition is that: the soft interlayer (104) of each hoop in the direct-buried bracket (1) is attached to the center, and the two end parts of the hoop are connected in series with fastening bolts (105); the second preset condition is as follows: the soft interlayer (104) of each hoop is attached in the center, the bolts (105) are fastened, and the two sides of the hoop are symmetrical and are in equal-height parallel to the working pipe (2).
3. The manufacturing and installation method of the direct-buried prefabricated steam insulation pipe as claimed in claim 1, characterized in that the composite insulation layer on the working pipe (2) is arranged in the following way:
the heat-insulating layer (3) is provided with a plurality of layers, staggered joints are arranged among the heat-insulating layers (3), the size of a pressed joint is 1/2 that is used as the heat-insulating layer (3), and the reflecting layer (4) is wrapped outside each heat-insulating layer (3); the reflecting layer (4) is spirally wound on the heat insulation layer (3) in the reflecting layer, and the blank pressing length is 30-50 mm;
the pipe end of the working pipe (2) is reserved with the length of the non-wrapped heat-insulating layer (3) according to the following mode: when the diameter of the working pipe (2) is less than or equal to 150mm, the pipe end remaining length is 150mm, when the diameter of the working pipe (2) is 200-250 mm, the pipe end remaining length is 200mm, and when the diameter of the working pipe (2) is more than or equal to 250mm, the pipe end remaining length is 250 mm;
the heat-insulating layer (3) and the reflecting layer (4) are fixed by binding, the binding distance of the heat-insulating layer (3) is 400mm,
when the diameter of the working pipe (2) is smaller than 250mm, the binding distance of the reflecting layer is 300mm, and when the diameter of the working pipe (2) is larger than or equal to 250mm, the binding distance of the reflecting layer is 400 mm.
4. The manufacturing and installing method of the direct-buried prefabricated steam insulation pipe as claimed in claim 3, wherein the reflecting layer (4) sequentially comprises an aluminum foil layer (401), a flame-retardant adhesive layer (402) and a glass fiber layer (403) from inside to outside, and the aluminum foil layer (401) is attached to the insulation layer (3) inside the aluminum foil layer.
5. The method for manufacturing and installing the direct-buried prefabricated steam insulation pipe as claimed in claim 1, wherein the step of welding the working pipe (2) and the outer sleeve (6) comprises the following steps:
preheating the end to be welded to 120-250 ℃,
filling and welding the root of the end to be welded, wherein the welding thickness is 6-10 mm, and then filling to finish the cover surface;
overlaying a cover surface to sequentially form a transition layer and a protective layer, wherein the transition layer is welded for 1-2 layers, and the protective layer is welded for 2-3 layers; when the transition layer is welded, the later welding seam covers at least 1/3 width of the former welding seam;
and after the coating is welded, the surface of the welding seam is polished to be in smooth transition with the surface of the corresponding base metal.
6. The manufacturing and installation method of the direct-buried prefabricated steam insulation pipe as claimed in claim 1, wherein the anticorrosion treatment of the repaired position of the outer sleeve (6) comprises the following steps:
coating a first epoxy coal tar pitch on the outer surface of the outer sleeve (6), winding the glass fiber cloth (12) soaked with the epoxy coal tar pitch on the outer surface of the outer sleeve (6) according to a helical angle alpha, and scraping the glass fiber cloth (12) by a scraper blade along the axial direction while winding;
after surface drying, sequentially brushing a plurality of epoxy coal tar asphalts and a plurality of glass fiber cloths (12) according to the same method;
and repairing the surface defects after finishing coating, and coating finish paint.
7. The manufacturing and installation method of the direct-buried prefabricated steam insulation pipe as claimed in claim 1, wherein the working pipe (2) is subjected to corrosion prevention treatment after being welded, and the method comprises the following steps:
the surface of the working pipe (2) is sprayed by adopting an oiling spray gun, the distance between the touch nozzle and the surface of the working pipe (2) is about 400mm, the spray nozzle moves uniformly during spraying, the speed is kept at 10-18 m/min, the air pressure is 0.4-0.7 MPa, and the thickness of the sprayed surface is 0.3-0.5 mm.
8. The method for manufacturing and installing the direct-buried prefabricated steam insulation pipe as claimed in claim 1, wherein the direct-buried bracket comprises: the direct-buried support (1) comprises a sliding support (101) and a guide support (102);
the sliding support (101) comprises a clamp I (103 a), a support (110), a sliding plate (107) and a bottom plate (106), the bottom plate (106) is welded on the inner side of the outer sleeve (6), the support (110) is welded on the bottom of the clamp I (103 a), and the sliding plate (107) is welded on the bottom of the support (110) and is in sliding fit with the bottom plate (106);
guide bracket (102) include clamp II (103 b) and support round steel (108), support round steel (108) are provided with at least two, and its inner end welding is in the outside of clamp II (103 b), the outer end with the inboard sliding fit of outer tube (6).
9. The manufacturing and installing method of the direct-buried prefabricated steam heat-insulation pipe as claimed in claim 8, characterized in that the direct-buried bracket (1) further comprises a fixing bracket (109), the fixing bracket (109) is a conical structure, the large-mouth end of the fixing bracket is welded with the inner side of the outer sleeve (6), the heat-insulation layer (3) is arranged on the outer side of the welding position, and the small-mouth end of the fixing bracket is welded with the outer side of the working pipe (2).
10. The method for manufacturing and installing the direct-buried prefabricated steam insulation pipe as claimed in claim 9, wherein the included angle between the generatrix of the fixed bracket (109) and the axis thereof is 30 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022723.8A CN113700987A (en) | 2021-09-01 | 2021-09-01 | Manufacturing and mounting method of direct-buried prefabricated steam insulation pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022723.8A CN113700987A (en) | 2021-09-01 | 2021-09-01 | Manufacturing and mounting method of direct-buried prefabricated steam insulation pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113700987A true CN113700987A (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111022723.8A Pending CN113700987A (en) | 2021-09-01 | 2021-09-01 | Manufacturing and mounting method of direct-buried prefabricated steam insulation pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113700987A (en) |
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2021
- 2021-09-01 CN CN202111022723.8A patent/CN113700987A/en active Pending
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Application publication date: 20211126 |