CN203517036U - Double-plain-wall steel-plastic composite pipe - Google Patents
Double-plain-wall steel-plastic composite pipe Download PDFInfo
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- CN203517036U CN203517036U CN201320349697.4U CN201320349697U CN203517036U CN 203517036 U CN203517036 U CN 203517036U CN 201320349697 U CN201320349697 U CN 201320349697U CN 203517036 U CN203517036 U CN 203517036U
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- 239000004033 plastic Substances 0.000 title claims abstract description 121
- 229920003023 plastic Polymers 0.000 title claims abstract description 121
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 112
- 239000010959 steel Substances 0.000 claims abstract description 112
- 239000000463 material Substances 0.000 claims abstract description 51
- 238000004804 winding Methods 0.000 claims abstract description 15
- 238000003466 welding Methods 0.000 claims abstract description 12
- 238000005728 strengthening Methods 0.000 claims description 16
- 239000011159 matrix material Substances 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 abstract 4
- 239000012943 hotmelt Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 18
- 238000001816 cooling Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000002844 melting Methods 0.000 description 11
- 230000008018 melting Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- 238000007493 shaping process Methods 0.000 description 7
- 229920000098 polyolefin Polymers 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 230000000916 dilatatory effect Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229930000044 secondary metabolite Natural products 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
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Abstract
A double-plain-wall steel-plastic composite pipe comprises a plastic steel winding pipe base body and a plastic layer, wherein the plastic steel winding pipe base body and the plastic layer are sequentially arranged from inside to outside in a winding mode. At least two I-shaped reinforcing ribs and at least one T-shaped reinforcing rib are arranged on the outer side of the plastic steel winding pipe base body, narrow grooves matched with the I-shaped reinforcing ribs are formed in the inner surface of the plastic layer, wide grooves matched with the T-shaped reinforcing ribs are formed in the two lateral sides of the inner surface of the plastic layer, and the plastic layer is formed by winding plastic strips on the outer surface of the plastic steel winding pipe base body in the forward direction in a lap joint mode and conducting hot melt welding. The composite pipe is a liquid conveying pipeline which is high in ring stiffness, few in consumed materials and capable of bearing internal pressure, long in service life and better in overall performance, and has good sanitation performance.
Description
Technical field
The utility model patent relates to a kind of Double-flat wall steel plastic composite, is a kind of large diameter steel-plastic composite pipe, and this tubing is mainly used in liquid transportation art.
Background technique
Current domestic feedwater piping has been widely used polyvinyl plastics tubing, the feature of this tubing is very outstanding, there is permanent working life and remarkable decay resistance, and polyethylene pipe adds and does not add heavy metallic salt stabilizer man-hour, material is nontoxic, in addition it can not promote algae, bacterium or conk yet, has solved preferably the secondary pollution problem of cities and towns potable water, has good sanitation performance.Because it is overall plastic tubing, therefore when meeting working pressure and anti-external pressure (ring stiffness), the general wall thickness of tubing is thicker, materials are large, when larger caliber, the cost of material of tubing is very high, domestic generally accomplishing below DN≤1200mm, only have indivedual producers can accomplish DN=1600mm, but equipment investment is also quite large at present.Owing to adopting overall plastic manufacture, heavy caliber pipe out of roundness is very large, opposing external pressure ability is very low, and cost is also high especially, be difficult to be accepted on market, although people had developed the composite strengthening pressure tubing that pressure rank is higher, performance better, material is more economized in recent years, but produce bore generally also below diameter 800mm, most representative is exactly steel wire mesh frame wall tube material with composite structure, also can only produce below diameter 630mm, and the manufacturing mechanism of this tubing is also doubled and redoubled along with producing the increase price of tubing bore.
Polyethylene plastic-steel winding pipe industry standard CJ/T 270-2007, due to its unique texture with external spiral tendon, makes its tubing have ring stiffness higher in similar plastic drain pipe, as shown in Figure 7.Can manufacture diameter and be greater than 1200mm, the heavy caliber of Huan Gang Du≤8KN/ ㎡, the drainage pipe of high ring rigidity simultaneously.Heavy caliber drain pipe material is almost steel and moulds joint product in the market, these steel are moulded composite, water-drain pipeline and mostly are structural pipeline with no pressure, all there is the external load of enough ring stiffness energy bedsoil effects and guarantee long-term safety use, but can not be as there being the pipe-line for conveying liquids of pressure to use.
According to claimant, understand, current Double-flat wall steel plastic composite adopts heat to cover the planomural that mode is compounded to form outside conventionally, the plastics of directly extruding molten state in the outside of spiral winding pipe form, as shown in Figure 7, and in this process, there is following problem, the one, the plastic layer in outside is inhomogeneous, and the 2nd,, both junction plane contact amplitudes are little, junction at both is easy to crack, affects the working life of construction quality and tubing.
Model utility content
The technical problem that the utility model patent will solve is to provide that a kind of ring stiffness is high, and consumable material is few, can bear interior pressure, has the better liquid conducting pipes of combination property of good sanitation performance, long service life simultaneously.
The utility model solves the technological scheme that its technical problem adopts: a kind of Double-flat wall steel plastic composite, it is characterized in that: comprise from internal layer and be outwards wound around successively plastic-steel spirally-wound pipe tubing matrix and the plastic layer arranging, plastic-steel spirally-wound pipe tubing matrix melts welding by the winding of steel plastic band material heat and forms, in described plastic-steel spirally-wound pipe tubing matrix outside, comprise at least two I type strengthening rib and at least one T-shaped strengthening rib, described plastic layer internal surface has the narrow groove matching with I type strengthening rib, and there is at plastic layer internal surface dual-side the wide groove coordinating with T-shaped strengthening rib, described plastic layer by plastic strap be forward wound around be overlapped on plastic-steel spirally-wound pipe tubing matrix and heat melt welding form.
In described strengthening rib, be embedded with vertical steel band.
A manufacture method for Double-flat wall steel plastic composite, is characterized in that, comprises the following steps:
Step 2, utilizes steel plastic band material to produce plastic-steel spirally-wound pipe tubing; Continuous steel plastic band material is towed to Stetch Wrapping Machine, through being wound continuous tubing; Be wound around and at steel plastic band material both sides interface, with hot blast, carry out the pre-heat treatment simultaneously, and then with small-sized extruder, to interface, extrude the plastics of melting, to two of steel plastic band material faying surfaces, carry out bonding, with an adjustable pinch roller, bonding part internal surface is carried out to compacting simultaneously, and then shape all-in-one-piece plastic-steel spirally-wound pipe tubing, after plastic-steel spirally-wound pipe tube forming, by bracket, move backward;
Step 4, the plastic-steel spirally-wound pipe tubing place that the plastic strap of making in step 3 is delivered to step 2 making carries out compound, first utilize hot blast to carry out the pre-heat treatment to plastic strap, then the groove of described plastic strap internal surface coordinate with the stiffening rib of plastic-steel spirally-wound pipe pipe outer surface and under the drive of plastic-steel spirally-wound pipe tubing plastic strap auto spiral be coated to plastic-steel spirally-wound pipe pipe outer surface, simultaneously in plastic-steel spirally-wound pipe tubing one side, be provided with the U-groove bevel into plastic strap guiding.
The step that also comprises a pair of generated tubing cutting after step 4.
In step 1, in described uncoiling, sanction weldering, flattening and heating process, to use uncoiler, steel band to cut welding machine, flat rubber belting machine and heating generator, cold rolled steel tep reel is arranged on the back shaft of uncoiler (1), and by drawing respectively a steel band after the uncoiling of N platform uncoiler, is total to N root; Steel band after uncoiling enters flat rubber belting machine (4) after steel band is cut welding machine (2) and belt machine (3), and surface derusting device, degreasing unit and surface frosted device be set in belt machine (3), steel band after flat rubber belting machine (4) flattens carries out secondary oil removing and heat treated to steel strip surface again after heating generator (5), make steel strip surface temperature reach 180 ℃～220 ℃, steel band after heat-treating enters in composite extruding mould (6) and carries out compound extruded with the polyolefin plastics of the first extruder (17) melting, forms described steel plastic band material; The structure of composite extruding mould is corresponding with the shape of produced band; Meanwhile, described steel plastic band material through shaping platform shape and water cooling after form continuous steel plastic band material.
In order to meet moulding needs and the water temperature requirement of band, dispose the first handpiece Water Chilling Units (16) circulating water in the first shaping platform (7) is freezed to enhance productivity.
In step 2, steel plastic band material (21) after cooling forming is continuously at the first tractor (8) with lead second and draw under the common traction of machine (11) and enter in Stetch Wrapping Machine (12), for off-gauge strip, can cut with belt material cutoff saw (9), in order to prevent the long phenomenon that mops floor that causes of band, in the middle of two tractors, be provided with band pallet (10), in Stetch Wrapping Machine (12), have a small-sized extruder and Wrapping formed cage; Under the synergy of Wrapping formed cage constraint and laminating mechanism, steel plastic band material is wound in continuous circular tube shaped tubing, be wound around and in the both sides up and down of band interface, with hot blast, carry out the pre-heat treatment simultaneously, and then with small-sized extruder, to interface place, extrude the plastics of melting, two interfaces of steel plastic band material carry out bondingly with an internal surface of adjustable pinch roller, carrying out compacting simultaneously, and then form whole tubing.
In step 3, described U-groove bevel is arranged on ground by support, and described support can be adjusted position in horizontal and vertical three dimensional space.
In step 4, to the air heater of plastic strap heating, be fixed, according to the needs of heating power, one or two heater are set, but the port of heater is for flexibly connecting.
The beneficial effects of the utility model are:
1, in tubing, adopt vertical reinforced structure and steel wire mesh frame to strengthen structure, both guaranteed that the ring stiffness of tubing maximized, can carry interior pressure again;
When 2, guaranteeing ring stiffness and the interior pressure of carrying, can save significantly raw materials for plastics production, make tubing cost lower;
3, adopt unique reinforcement winding structure and plastic layer, can produce bigbore pipe-line for conveying liquids;
4, band adopts unique texture, in process of production, after plastic-steel spirally-wound pipe tube forming, there is no in completely cooling situation that it is carried out to secondary compound, avoided traditional vertical steel band to be easy to occur falling the situation of muscle, thereby guaranteed the ring stiffness of tubing, reduced the use amount of steel band simultaneously;
5, because outer wall is planomural structure, tubing intensity is high, stacks and highly can suitably put height, can reduce the site area taking when tubing is stacked;
6, good forming effect;
7,, because outer surface is planomural structure, during tubing transportation, can adopt suit mode, thereby reduce cost of transportation;
8, outer pipe wall is planomural structure, and the feature of plastics is that surface friction drag is little, can be widely used in trenchless engineering, also can use as dilatory pipe, for improving field operation efficiency and sizable effect has been played on protection road surface;
9, the outer surface due to tubing is planomural structure, can adopt outer electric heating melting Placement, does not need with special-purpose supporting tooling, connect very conveniently and firm, and the material of welding consumables and tubing is identical, forms perfectly whole after welding, guarantee the airtight performance of tubing, Never-leakage;
10, because main body tubing adopts winding structure mode, equipment die volume is little, little investment, and mould kind is few, the cooling employing water-bath of the band type of cooling, does not re-use traditional Vacuum shaping type of cooling, overall device cost of investment is little, and hold facility area is also very little;
11, band and tubing once-through, efficiency is high, and the auxiliary PLC module controls that adopts in front and back, and synchronism is good, adjusts speed of production extremely convenient.
12, because tubing is hollow wall structure, adopt steel strip reinforced, drawing pipe intensity is the more than 5 times of equal wall thickness plastic tube, has guaranteed higher tensile strength, can be widely used in the middle of trenchless engineering simultaneously, does dilatory tubing and uses.
13, can solve the problem that tradition meets pipeline restricted diameter, the pipeline that is especially applicable to heavy caliber or super large caliber is made.
Accompanying drawing explanation
Fig. 1 is the plan view of plain-wall pipe;
Fig. 2 is the amplification effect figure of A-A fragmentary section views in Fig. 1;
Fig. 3 is the stereogram of steel plastic band material;
Fig. 4 is the stereogram of plastic strap;
Fig. 5 is winding process signal;
Fig. 6 is the utility model manufacturing process flow diagram and device;
Fig. 7 is the structural representation (with reference to Fig. 2) of existing two flat walls plastic steel composite pipe.
Embodiment
As shown in Figure 2 and Figure 3, a kind of steel plastic band material, is a kind of steel plastic band material 21 of extrusion moulding, and in the internal rib of steel plastic band material, is inlaid with Vertical Steel rib 22, and Vertical Steel rib essence is steel band; So not only utilize the antiseptic property of plastics but also utilized the rigidity of Vertical Steel rib, guaranteed buried pipe ring stiffness.Strengthening rib is wherein divided into two kinds, and a kind of is I shape strengthening rib 26, and a kind of is T shape strengthening rib 27, and T shape is wherein for coordinating and weld with the plastic strap in outside.In the junction, side of steel plastic band material 21, adopt bridging arrangement 23 simultaneously, lap-joint adopts the mode of sweat soldering to carry out, like this adjacent band body in conjunction with time, greatly increased area of contact when two sides are bonding, more firm while making tubing bonding, greatly improved the joint strength of tubing.
As shown in Figure 2 and Figure 4, a kind of plastic strap, this plastic strap is extruded formation by the second extruder, and the internal surface of plastic strap 24 corresponding be provided with equally spaced groove 25, groove is wherein divided into two kinds, and a kind of is narrow, coordinates with I shape strengthening rib, a kind of is wide, coordinates with T shape strengthening rib.
As shown in Figure 1,
Steel plastic band material forms a kind of plastic-steel spirally-wound pipe tubing 18 by winding, happy and harmonious welding processing, has weld seam on it.And the outer surface of tubing matrix forward winding plastic band 24 form Double-flat wall steel plastic composites, as Fig. 5.
As shown in Figure 5, Figure 6, a kind of Double-flat wall steel plastic composite and manufacture method thereof, comprise the following steps:
Step 2, described continuous steel plastic band material is towed to Stetch Wrapping Machine 12, through being wound continuous plastic-steel spirally-wound pipe tubing 18; Be wound around simultaneously, in steel plastic band material both sides, interface carries out the pre-heat treatment with hot blast, and then with small-sized extruder, to interface, extrude the plastics of melting, to two of steel plastic band material interface bridging arrangements, carry out bonding, with an internal surface of adjustable pinch roller, carry out compacting simultaneously, and then form whole tubing; Further, steel plastic band material 21 after cooling forming continuously enters in Stetch Wrapping Machine 12 under the common traction of tractor 8 and tractor 11, for off-gauge strip, can cut with belt material cutoff saw 9, in order to prevent the long phenomenon that mops floor that causes of band, in the middle of two tractors, be provided with band pallet 10, in Stetch Wrapping Machine 12, have a small-sized extruder and Wrapping formed cage, Wrapping formed cage is a kind of mould of cylinder shape; Under the synergy of Wrapping formed cage constraint and laminating mechanism, steel plastic band material is wound in continuous circular tube shaped tubing, be wound around and in the left and right sides of band interface, with hot blast, carry out the pre-heat treatment simultaneously, and then with small-sized extruder, to interface place, extrude the plastics of melting, two interfaces of steel plastic band material carry out bondingly with an internal surface of adjustable pinch roller, carrying out compacting simultaneously, and then form whole tubing matrix.
In step 3, meanwhile, to the polyolefin plastics that passes into melting in the second extrusion die 31, through the second extruder, squeeze 32 and form above-mentioned plastic strap 24 after going out; Described plastic strap move backward through sizing and cooling after form the continuous plastic strap of moulding, further, steel plastic band material 24 is shaped through the second shaping platform 34 and after water cooling, is formed continuous steel plastic band material, completes the preparation of plastic strap; Further, in order to meet moulding needs and the water temperature requirement of band, the circulating water disposing in 35 pairs of the second shaping platforms 34 of the second handpiece Water Chilling Units freezes to enhance productivity.
Step 4, plastic strap 24 is delivered to plastic-steel spirally-wound pipe tubing 18 downsides of moulding, tangent direction enters, utilize hot blast to carry out the pre-heat treatment to plastic strap, the groove of described plastic strap 24 internal surfaces coordinate with the stiffening rib of plastic-steel spirally-wound pipe tubing 18 outer surfaces and under the drive of plastic-steel spirally-wound pipe tubing plastic strap auto spiral be coated to plastic-steel spirally-wound pipe pipe outer surface, with reference to Fig. 5, in plastic-steel spirally-wound pipe tubing one side, be provided with the U-groove bevel 33 into plastic strap guiding simultaneously, U-groove bevel is arranged on ground by support, and described support can be adjusted position in horizontal and vertical three dimensional space, as a guide die, use, guarantee both position relationships.In this course, plastic strap 24 continuously enters in U-groove bevel 33 under the common traction of the 3rd tractor 36 and the 4th tractor 37, in order to prevent the long phenomenon that mops floor that causes of band, is provided with band pallet 38 in the middle of two tractors.
In step 4, to the air heater of plastic strap heating, be fixed, according to the needs of heating power, one or two heater are set, but the port of heater is for flexibly connecting.
Step 5, finally cuts generated tubing, forms the tubing that meets length requirement.
For improving the manufacturing efficiency of tubing, the cooling employing water-cooling pattern of two kinds of bands carries out cooling; When continuously producing, tubing along tubing axial direction, advances on fixing frame 13, for requiring the tubing of certain length to carry out fixed length cutting with tubing cast-cutting saw 14, form helically reinforced pipe finished product, the tubing after cutting is temporarily placed on one can be along on the movable stand 15 of tubing axial motion.
Embodiment recited above is described preferred implementation of the present utility model; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; relevant technical staff in the field, to various distortion of the present utility model and improvement, all should expand in protection domain as determined in the utility model claims.
Claims (2)
1. a Double-flat wall steel plastic composite, it is characterized in that: comprise from internal layer and be outwards wound around successively plastic-steel spirally-wound pipe tubing matrix and the plastic layer arranging, plastic-steel spirally-wound pipe tubing matrix melts welding by the winding of steel plastic band material heat and forms, in described plastic-steel spirally-wound pipe tubing matrix outside, comprise at least two I type strengthening rib and at least one T-shaped strengthening rib, described plastic layer internal surface has the narrow groove matching with I type strengthening rib, and there is at plastic layer internal surface dual-side the wide groove coordinating with T-shaped strengthening rib, described plastic layer by plastic strap be forward wound around be overlapped on plastic-steel spirally-wound pipe tubing outer surface of matrix and carry out heat melt welding form.
2. a kind of Double-flat wall steel plastic composite according to claim 1, is characterized in that, is embedded with vertical steel band in described strengthening rib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320349697.4U CN203517036U (en) | 2013-06-18 | 2013-06-18 | Double-plain-wall steel-plastic composite pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320349697.4U CN203517036U (en) | 2013-06-18 | 2013-06-18 | Double-plain-wall steel-plastic composite pipe |
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| CN203517036U true CN203517036U (en) | 2014-04-02 |
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| CN201320349697.4U Expired - Fee Related CN203517036U (en) | 2013-06-18 | 2013-06-18 | Double-plain-wall steel-plastic composite pipe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353027A (en) * | 2013-06-18 | 2013-10-16 | 山东天迈管业有限公司 | Double-flat wall steel-plastic composite pipe and manufacturing method thereof |
| CN104019295A (en) * | 2014-06-09 | 2014-09-03 | 张永杰 | Steel frame steel-plastic composite pipe and manufacturing method and production line of steel frame steel-plastic composite pipe |
| CN105179922A (en) * | 2014-06-18 | 2015-12-23 | 上海永玺环境科技有限公司 | PVC crust foaming section bar and manufacturing method |
| CN105179822A (en) * | 2015-10-29 | 2015-12-23 | 南京联众建设工程技术有限公司 | Steel-concrete composite-structure pipe with smooth inner surface and smooth outer surface and preparing method thereof |
| CN106247035A (en) * | 2016-07-27 | 2016-12-21 | 上海瑞皇管业科技有限公司 | Double-deck eyelid covering winding steel multiple tube and combination process |
-
2013
- 2013-06-18 CN CN201320349697.4U patent/CN203517036U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353027A (en) * | 2013-06-18 | 2013-10-16 | 山东天迈管业有限公司 | Double-flat wall steel-plastic composite pipe and manufacturing method thereof |
| CN103353027B (en) * | 2013-06-18 | 2015-11-25 | 山东天迈管业有限公司 | A kind of manufacture method of Double-flat wall steel-plastic composite pipe |
| CN104019295A (en) * | 2014-06-09 | 2014-09-03 | 张永杰 | Steel frame steel-plastic composite pipe and manufacturing method and production line of steel frame steel-plastic composite pipe |
| CN104019295B (en) * | 2014-06-09 | 2017-02-01 | 苏昭缄 | Steel frame steel-plastic composite pipe and manufacturing method and production line of steel frame steel-plastic composite pipe |
| CN105179922A (en) * | 2014-06-18 | 2015-12-23 | 上海永玺环境科技有限公司 | PVC crust foaming section bar and manufacturing method |
| CN105179822A (en) * | 2015-10-29 | 2015-12-23 | 南京联众建设工程技术有限公司 | Steel-concrete composite-structure pipe with smooth inner surface and smooth outer surface and preparing method thereof |
| CN106247035A (en) * | 2016-07-27 | 2016-12-21 | 上海瑞皇管业科技有限公司 | Double-deck eyelid covering winding steel multiple tube and combination process |
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