CN108591680A - Steel gas pipe underground anticorrosion structure and construction method above a kind of ground library - Google Patents
Steel gas pipe underground anticorrosion structure and construction method above a kind of ground library Download PDFInfo
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- CN108591680A CN108591680A CN201810499898.XA CN201810499898A CN108591680A CN 108591680 A CN108591680 A CN 108591680A CN 201810499898 A CN201810499898 A CN 201810499898A CN 108591680 A CN108591680 A CN 108591680A
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- Prior art keywords
- isolation board
- ground
- library
- isolation
- board
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000010276 construction Methods 0.000 title claims abstract description 19
- 239000002689 soil Substances 0.000 claims abstract description 36
- 239000004698 Polyethylene Substances 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 230000003628 erosive effect Effects 0.000 claims abstract description 15
- -1 polyethylene Polymers 0.000 claims abstract description 15
- 229920000573 polyethylene Polymers 0.000 claims abstract description 15
- 238000002955 isolation Methods 0.000 claims description 78
- 239000004568 cement Substances 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 6
- 230000002349 favourable effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 54
- 230000002421 anti-septic effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- 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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
-
- 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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1063—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sheet wrapped around the pipe
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
- E02D2300/0009—PE
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
The present invention relates to steel gas pipe underground anticorrosion structure above a kind of ground library and construction methods, anticorrosion structure includes the isolating cylinder being embedded in above ground library, the both ends of isolating cylinder are in the outside that ground library roof projects in above-below direction, gas pipeline is embedded in the soil in isolating cylinder, is equipped with viscoelastic body erosion resistant coating and polyethylene cold tape wrap on the periphery wall of gas pipeline successively from the inside to the outside.It has the advantages that simple in structure, safe and reliable, favorable anti-corrosion effect, highly practical, can effectively avoid gas pipeline and is impregnated by the ponding in direction on ground library, reduces corrosion risk, extend service life；Construction method has the advantages that simple for process, implementation is easy.
Description
Technical field
The present invention relates to a kind of buried pipeline anticorrosion structures, and in particular to the steel gas pipe underground anti-corrosion above a kind of ground library
The construction method of structure and the anticorrosion structure.
Background technology
With the fast development of urban construction and gas industry, the ground that some low-pressure fuel gas pipelines need to be embedded in cell is got off
Library (library) top.Compared to other steel gas pipe undergrounds, the gas pipeline above ground library is easier to corrode, be mainly manifested in
Lower aspect：Because Buried Depth of Gas Pipeline is shallower, it is easy to be impregnated by the watering pours water of flowers and plants, trees；Ground library roof be cement structures simultaneously
Equipped with waterproof layer, rainwater can not be discharged in time, and gas pipeline is caused to be chronically in more moist environment.These factors all can
Corrosion rate can also be accelerated once corroding by increasing gas pipeline corrosion risk.
Invention content
The object of the present invention is to provide steel gas pipe underground anticorrosion structure above a kind of ground library and construction method, anticorrosion structures
Has the advantages that simple in structure, safe and reliable, favorable anti-corrosion effect, highly practical, direction soil on avoidable gas pipeline quilt ground library
Ponding in earth impregnates, and reduces corrosion risk, extends service life；Construction method has simple for process, implementation readily
Advantage.
To solve the above-mentioned problems in the prior art, a kind of ground library top provided by the invention steel gas pipe underground is anti-
Rotten structure, including it is embedded in the isolating cylinder above ground library, the both ends of the isolating cylinder are in ground library roof and throw in above-below direction
The outside of shadow, the gas pipeline are embedded in the soil in isolating cylinder, are set successively from the inside to the outside on the periphery wall of gas pipeline
There are viscoelastic body erosion resistant coating and polyethylene cold tape wrap.
Further, steel gas pipe underground anticorrosion structure above a kind of ground of the invention library, wherein the isolating cylinder includes U
Type groove and the cover board being sealingly fastened in U-type groove, the width of cover board are more than the width of U-type groove, and the both sides of cover board are equipped with downwards
The edge of extension.
Further, steel gas pipe underground anticorrosion structure above a kind of ground of the invention library, wherein the both sides of the isolating cylinder
It is correspondingly provided with the first isolation board and the second isolation board being embedded in soil, the top extension of the first isolation board and the second isolation board
To ground, the bottom of the first isolation board and the second isolation board extends to ground library roof.
Further, a kind of ground library top of the invention steel gas pipe underground anticorrosion structure, wherein the isolating cylinder it is U-shaped
It is equipped with gap between groove bottom wall and ground library roof and between the cover board and ground of isolating cylinder.
Further, steel gas pipe underground anticorrosion structure above a kind of ground library of the invention, wherein first isolation board with
Second isolation board constitutes inverse Ba type, and gap is equipped between the first isolation board and the second isolation board and isolating cylinder.
Further, a kind of ground library top of the invention steel gas pipe underground anticorrosion structure, wherein the isolating cylinder it is U-shaped
Slot and cover board and the first isolation board and the second isolation board are poured by cement and are constituted.
The construction method of steel gas pipe underground anticorrosion structure above a kind of above-mentioned ground library provided by the invention, including following step
Suddenly：
One, viscoelastic body erosion resistant coating and polyethylene cold tape wrap are set gradually from the inside to the outside on the periphery wall of gas pipeline；
Two, the ground above ground library is excavated to form groove structure, and the two side of groove be correspondingly arranged first every
From plate and the second isolation board；
Three, U-type groove is set after the certain thickness soil of pre-fill in the groove between the first isolation board and the second isolation board
It sets in the trench；
Four, it bankets in the U-type groove of isolating cylinder, and gas pipeline is embedded in soil therein；Soil fills up U-type groove
Afterwards, cover board is set in U-type groove；
Five, it bankets in the groove between the first isolation board and the second isolation board again, and U-type groove and cover board is embedded to mud
In soil, soil is compacted after filling up groove.
Further, the construction method of a kind of ground of the invention library top steel gas pipe underground anticorrosion structure, wherein above-mentioned
It in step 2, allows at the top of the first isolation board and the second isolation board and stretches to ground, allow the first isolation board and the second isolation board
Bottom extends to ground library roof, and the first isolation board and the second isolation board is made to be in inverse Ba type.
Above a kind of ground library of the invention steel gas pipe underground anticorrosion structure and construction method compared with prior art, with
Lower advantage：The present invention is embedded in the isolating cylinder above ground library by setting, and the both ends of isolating cylinder is allowed to be in ground library roof upper
The outside of lower direction projection, gas pipeline is embedded in the soil in isolating cylinder, and by interior on the periphery wall of gas pipeline
To setting gradually viscoelastic body erosion resistant coating and polyethylene cold tape wrap outside.Thus a kind of simple in structure, safe and reliable, anti-corrosion is just constituted
Steel gas pipe underground anticorrosion structure above good, the highly practical ground library of effect.The present invention by the way that isolating cylinder is arranged above ground library,
Gas pipeline is embedded in the soil in isolating cylinder, is gas pipeline structure on the basis of ensureing steel gas pipe underground characteristic
Stabilization, independent soil environment have been built, the ponding above ground library in soil has been can avoid and enters immersion gas pipeline in isolating cylinder, drop
Low corrosion risk.Meanwhile the present invention by setting gradually viscoelastic body erosion resistant coating from the inside to the outside on the periphery wall of gas pipeline
With polyethylene cold tape wrap, enhance antiseptic property, though if thering is a small amount of rainwater to enter isolating cylinder can by viscoelastic body erosion resistant coating and
Polyethylene cold tape wrap prevents moisture from directly being contacted with gas pipeline.By being analyzed above it is found that the present invention is made up of isolating cylinder
The first line of defence and the second defence line that constitutes of viscoelastic body erosion resistant coating and polyethylene cold tape wrap, can effectively prevent on ground library
Ponding in necromancer earth corrodes gas pipeline, ensure that anti-corrosion effect, extends the service life of gas pipeline.The present invention provides
A kind of ground library above steel gas pipe underground anticorrosion structure construction method have it is simple for process, implement be easy, favorable anti-corrosion effect
The advantages of.
Shown specific implementation mode is to steel gas pipe underground anticorrosion structure above a kind of ground of the invention library below in conjunction with the accompanying drawings
And construction method is described in further detail：
Description of the drawings
Fig. 1 is the schematic cross-section of steel gas pipe underground anticorrosion structure above a kind of ground of the invention library；
Fig. 2 be above a kind of ground library of the invention in steel gas pipe underground anticorrosion structure gas pipeline and viscoelastic body erosion resistant coating with
The schematic cross-section of polyethylene cold tape wrap.
Specific implementation mode
Firstly the need of explanation, the nouns of locality such as heretofore described upper and lower, front, rear, left and right only with reference to the accompanying drawings into
Capable description, in order to understand, not to technical scheme of the present invention and be claimed range progress limitation.
The specific implementation mode of the present invention a kind of ground library top steel gas pipe underground anticorrosion structure as depicted in figs. 1 and 2, packet
Include the isolating cylinder 1 being embedded in above ground library, and allow the both ends of isolating cylinder 1 be in ground library roof project in above-below direction it is outer
Side.Gas pipeline 6 is embedded in the soil in isolating cylinder 1.And it is set gradually from the inside to the outside on the periphery wall of gas pipeline 6
Viscoelastic body erosion resistant coating 2 and polyethylene cold tape wrap 3.Be arranged through the above structure just constitute it is a kind of simple in structure, safe and reliable, anti-
Steel gas pipe underground anticorrosion structure above good, the highly practical ground library of rotten effect.The present invention is isolated by being arranged above ground library
Cylinder 1, gas pipeline 6 is embedded in the soil in isolating cylinder 1, is combustion gas on the basis of ensureing steel gas pipe underground characteristic
Pipeline 6 constructs stable, independent soil environment, can avoid the ponding above ground library in soil and enters immersion combustion in isolating cylinder 1
Feed channel 6, reduces corrosion risk.Meanwhile the present invention is viscous by being set gradually from the inside to the outside on the periphery wall of gas pipeline 6
Body erosion resistant coating 2 and polyethylene cold tape wrap 3, enhance its antiseptic property, even if can pass through if having a small amount of rainwater to enter isolating cylinder
Viscoelastic body erosion resistant coating 2 and polyethylene cold tape wrap 3 prevent moisture from directly being contacted with gas pipeline 6.By being analyzed above it is found that this hair
The second that the bright the first line of defence being made up of isolating cylinder 1 and viscoelastic body erosion resistant coating 2 and polyethylene cold tape wrap 3 are constituted is anti-
Line can effectively prevent the ponding above ground library in soil and corrode gas pipeline 6, ensure that anti-corrosion effect, extend gas pipeline 6
Service life.
As specific implementation mode, the present invention allows isolating cylinder 1 using the structure type for including U-type groove 11 and cover board 12, will
Cover board 12 is sealingly fastened in U-type groove 11, and allows the width of cover board 12 more than the width of U-type groove 11, equal in the both sides of cover board 12
The edge 13 extended downwardly is set.The isolating cylinder 1 of this structure has the characteristics that simple in structure, easy to use, is conducive to construct,
And effective protective action can be played to the junction of U-type groove 11 and cover board 12 by edge 13, it ensure that 1 inner and outer ring of isolating cylinder
The buffer action in border.
Scheme as an optimization, present embodiment have been correspondingly arranged be embedded in soil in the both sides of isolating cylinder 1
One isolation board 4 and the second isolation board 5, and the first isolation board 4 and the top of the second isolation board 5 is allowed to extend to ground 7, allow first every
Bottom from plate 4 and the second isolation board 5 extends to ground library roof 8.By the way that the first isolation board 4 and the second isolation board 5 is arranged with regard to structure
At three lines of defence, the soil environment for keeping isolation by distance cylinder 1 closer is realized with soil environment farther out and is relatively isolated, and can be subtracted
Moisture in slow soil farther out can avoid to nearlyr soil permeability especially for flowers and plants, the trees of isolation by distance cylinder 1 farther out
Watering pours water is directly entered isolating cylinder 1, and anti-corrosion effect is more preferable, and practicability is stronger.
As specific implementation mode, the present invention is between 11 bottom wall of U-type groove and ground library roof 8 of isolating cylinder 1, and isolation
There are gaps between the cover board 12 and ground 7 of cylinder 1.Certain absorption can be carried out to moisture by the soil in gap, slowed down
Influence of the moisture to isolating cylinder 1 and gas pipeline.Meanwhile present embodiment allows the first isolation board 4 and the second isolation board 5
Inverse Ba type is constituted, to improve the convenience of construction, and is stayed between the first isolation board 4 and the second isolation board 5 and isolating cylinder 1
There is gap, the moisture to slow down distant place is permeated to isolating cylinder 1.
It should be noted that the U-type groove 11 of isolating cylinder 1 and cover board 12 and the first isolation board 4 and in practical applications
Two isolation boards 5 are all made of cement and pour composition, it is ensured that its buffer action and structural strength.
Based on same inventive concept, the present invention also provides steel gas pipe underground anticorrosion structures above a kind of above-mentioned ground library
Construction method specifically includes following steps：
One, viscoelastic body erosion resistant coating 2 and polyethylene cold tape wrap 3 are set gradually from the inside to the outside on the periphery wall of gas pipeline.
Two, the ground above ground library is excavated to form groove structure, and the two side of groove be correspondingly arranged first every
From plate 4 and the second isolation board 5.
Three, in the groove between the first isolation board 4 and the second isolation board 5 after the certain thickness soil of pre-fill, by U-type groove
11 settings are in the trench.
Four, it bankets in the U-type groove 11 of isolating cylinder 1, and gas pipeline is embedded in soil therein；Soil fills up U-shaped
After slot 11, cover board 12 is set in U-type groove 11.
Five, it bankets in the groove between the first isolation board 4 and the second isolation board 5 again, and by U-type groove 11 and cover board 12
It is embedded in soil, soil is compacted after filling up groove.
As specific implementation mode, in above-mentioned steps two, the present invention usually allows the first isolation board 4 and the second isolation board 5
Top stretch to ground, allow the bottom of the first isolation board 4 and the second isolation board 5 to extend to ground library roof, with enhancing isolation effect
Fruit；And the first isolation board 4 and the second isolation board 5 is made to be in inverse Ba type, to improve the convenience of construction.
The construction method of steel gas pipe underground anticorrosion structure has simple for process, real above a kind of ground library provided by the invention
The advantages of applying easy, favorable anti-corrosion effect.
Above example is only the description carried out to the preferred embodiment of the present invention, and model not is claimed to the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, the technology of this field engineers and technicians according to the present invention
The various forms of deformations that scheme is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (8)
1. steel gas pipe underground anticorrosion structure above a kind of ground library, which is characterized in that including the isolating cylinder being embedded in above ground library
(1), the both ends of the isolating cylinder (1) are in the outside that ground library roof projects in above-below direction, and the gas pipeline is embedded in
In soil in isolating cylinder (1), it is equipped with viscoelastic body erosion resistant coating (2) and polyethylene on the periphery wall of gas pipeline successively from the inside to the outside
Cold winding band (3).
2. steel gas pipe underground anticorrosion structure above a kind of ground library described in accordance with the claim 1, which is characterized in that the isolation
Cylinder (1) includes U-type groove (11) and the cover board (12) being sealingly fastened in U-type groove (11), and the width of cover board (12) is more than U-type groove
(11) width, the both sides of cover board (12) are equipped with the edge (13) extended downwardly.
3. steel gas pipe underground anticorrosion structure above library according to claim 2 a kind ofly, which is characterized in that the isolation
The both sides of cylinder (1) are correspondingly provided with the first isolation board (4) being embedded in soil and the second isolation board (5), the first isolation board (4) and
Extend to ground at the top of second isolation board (5), the bottom of the first isolation board (4) and the second isolation board (5) extends to Di Kuding
Wall.
4. steel gas pipe underground anticorrosion structure above a kind of ground library described in accordance with the claim 3, which is characterized in that the isolation
Cylinder (1) U-type groove (11) bottom wall and ground library roof between and isolating cylinder (1) cover board (12) be equipped between ground between
Gap.
5. steel gas pipe underground anticorrosion structure above library according to claim 4 a kind ofly, which is characterized in that described first
Isolation board (4) and the second isolation board (5) constitute inverse Ba type, the first isolation board (4) and the second isolation board (5) and isolating cylinder (1)
Between be equipped with gap.
6. steel gas pipe underground anticorrosion structure above library according to claim 5 a kind ofly, which is characterized in that the isolation
The U-type groove (11) and cover board (12) and the first isolation board (4) and the second isolation board (5) of cylinder (1) are poured by cement and are constituted.
7. the ground construction method of steel gas pipe underground anticorrosion structure above library described in a kind of claim 6, which is characterized in that including
Following steps：
One, viscoelastic body erosion resistant coating (2) and polyethylene cold tape wrap (3) are set gradually from the inside to the outside on the periphery wall of gas pipeline；
Two, the ground above ground library is excavated to form groove structure, and the first isolation board is correspondingly arranged in the two side of groove
(4) and the second isolation board (5)；
Three, in the groove between the first isolation board (4) and the second isolation board (5) after the certain thickness soil of pre-fill, by U-type groove
(11) it is arranged in the trench；
Four, it bankets in the U-type groove (11) of isolating cylinder (1), and gas pipeline is embedded in soil therein；Soil fills up U-shaped
After slot (11), cover board (12) is set in U-type groove (11)；
Five, it bankets in the groove between the first isolation board (4) and the second isolation board (5) again, and by U-type groove (11) and cover board
(12) it is embedded in soil, soil is compacted after filling up groove.
8. according to described in claim 7 the construction method of library top steel gas pipe underground anticorrosion structure, which is characterized in that in step
In rapid two, allow at the top of the first isolation board (4) and the second isolation board (5) and stretch to ground, allow the first isolation board (4) and second every
Bottom from plate (5) extends to ground library roof, and the first isolation board (4) and the second isolation board (5) is made to be in inverse Ba type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499898.XA CN108591680A (en) | 2018-05-23 | 2018-05-23 | Steel gas pipe underground anticorrosion structure and construction method above a kind of ground library |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499898.XA CN108591680A (en) | 2018-05-23 | 2018-05-23 | Steel gas pipe underground anticorrosion structure and construction method above a kind of ground library |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108591680A true CN108591680A (en) | 2018-09-28 |
Family
ID=63632895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810499898.XA Pending CN108591680A (en) | 2018-05-23 | 2018-05-23 | Steel gas pipe underground anticorrosion structure and construction method above a kind of ground library |
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| CN (1) | CN108591680A (en) |
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