CN101498390B - Glass fibre reinforced plastic and prestress steel cylinder concrete composite pipes and manufacturing process thereof - Google Patents
Glass fibre reinforced plastic and prestress steel cylinder concrete composite pipes and manufacturing process thereof Download PDFInfo
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- CN101498390B CN101498390B CN2009100611589A CN200910061158A CN101498390B CN 101498390 B CN101498390 B CN 101498390B CN 2009100611589 A CN2009100611589 A CN 2009100611589A CN 200910061158 A CN200910061158 A CN 200910061158A CN 101498390 B CN101498390 B CN 101498390B
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Abstract
The invention belongs to the technical field of water supply and drainage pipeline engineering, in particular relates to a pipeline and a making technology thereof. The making tecnhology of a fiberglass-reinforced plastics and prestressed steel cylinder concrete composite pipe is characterized by comprising the following steps: 1) making a composite steel sleeve; 2) making a fiberglass-reinforced plastics inner liner on a lining mould by using a winding process; 3) sleeving the composite steel sleeve on the inner liner of the fiberglass-reinforced plastics, pouring a transition layer material in a transition layer cavity to form the transition layer; 4) sleeving an outer mould out of the composite steel sleeve, pouring a concrete into a space between the composite steel sleeve and an inner wall of the outer mould to form a concrete structure layer, removing the outer mould; 5) winding a prestressed steel wire out of the concrete structure layer to form a prestressed steel wire winding layer; 6) pouring, coating or winding an outer protection layer material out of the prestressed steel wire winding layer to make an outer protection layer; removing the lining mould and obtaining the fiberglass-reinforced plastics and prestressed steel cylinder composite pipe. The composite pipe has characteristics of high stiffness, good intension and corrosion resistance.
Description
Technical field
The invention belongs to the water and wastewater piping engineering technical field, be specifically related to a kind of pipeline and preparation process thereof.
Background technique
PCCP (PRESTRESSED CONCRETE CYLINDER PIPE) is the composite pipe that is made of reinforcement wire, steel bushing, concrete, is the english abbreviation of Prestressed concrete cylinder pipe; This tubing is on the concrete tube core of band steel bushing, and hoop twines reinforcement wire, executes the spraying cement mortar cover and makes in that pipe is outside at last, so the PCCP pipe has that rigidity is big, intensity is high, cost is relatively than characteristics; In addition, the high starting point of bigbore PCCP pipe production threshold, manufacturing enterprise is larger, reliable product quality.But PCCP manages still defectiveness and deficiency, mainly shows: 1) working surface of the rubber of the steel socket of PCCP pipe placement groove face and steel bellmouth is all exposed outside, corrosion easily; 2) the pH value at the steel bushing of PCCP pipe and steel joint place is different, thereby can quicken the corrosion of joint, may cause accidents such as leaking of pipe joint thus.3) inwall of pipeline adopts cement sand bed, and the roughness coefficien of inwall is higher, and the flow of pipeline is exerted a certain influence.
Summary of the invention
The object of the present invention is to provide a kind of glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes and preparation process thereof, this composite pipe has corrosion resistant characteristics.
To achieve these goals, technological scheme of the present invention is: glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes, and it comprises Prestressed concrete cylinder pipe; Prestressed concrete cylinder pipe comprises steel bushing, concrete structure layer, reinforcement wire winding layer, external protection, the outer side surface of steel bushing is perfused with the concrete structure layer, the outer side surface of concrete structure layer is wound with the reinforcement wire winding layer, and reinforcement wire winding layer outside is manufactured with external protection (external protection and reinforcement wire winding layer link into an integrated entity); The right part of Prestressed concrete cylinder pipe is a bellmouth, and the left part of Prestressed concrete cylinder pipe is a socket; It is characterized in that: the inboard of steel bushing is provided with the frp lining layer, is provided with transition layer (frp lining layer and steel bushing are linked into an integrated entity by transition layer) between frp lining layer and the steel bushing; The outer side surface of the left part of steel bushing is set with the glass fibre reinforced plastics plug of annular, and the outer side surface of glass fibre reinforced plastics plug is provided with 2～5 road annular grooves.
The right-hand member of frp lining layer protrudes the right-hand member 0.1cm～3cm of steel bushing, the right-hand member of the right part parcel steel bushing of transition layer; The left end of glass fibre reinforced plastics plug protrudes the left end 0.1cm～3cm of steel bushing; The left end of frp lining layer protrudes the left end 0.1cm～3cm of steel bushing, the left end of the left part parcel steel bushing of transition layer.
The material of described transition layer is resin mortar, concrete or glass fibre reinforced plastics.The resin mortar layer adopts the perfusion resin mortar to form.Annotating concrete layer adopts concrete perfusion to form.Frp layer adopts technologies such as dragging and squeezing glass fiber reinforced plastics or RTM to make and forms.
The material of described external protection is resin mortar, slush, glass fibre reinforced plastics or thermoplastic material.
The preparation process of above-mentioned glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes is characterized in that it comprises the steps:
1) making of Composite Steel sleeve: the left part outer side surface at the socket steel bushing adopts winding process to make the glass steel part, opens 2～5 road annular grooves then on the glass steel part, forms the compound steel cylinder outlet structure of glass fibre reinforced plastics; With the left end welding of the right-hand member and the pipe shaft steel bushing of the socket steel bushing of the compound steel cylinder outlet structure of glass fibre reinforced plastics, the left end welding of the right-hand member of pipe shaft steel bushing and bellmouth steel bushing, formation Composite Steel sleeve;
2) adopt winding process on the liner mould, to make the frp lining layer;
3) the liner mould is stood on the worktable liner mould and stationary table; Outside the frp lining layer, Composite Steel sleeve and stationary table form the transition layer chamber that annular port is arranged up and down between frp lining layer and the Composite Steel sleeve with the composite steel sleeve jacket casing, and the perfusion buffer layer material forms transition layer to the transition layer chamber;
4) at outer mold of Composite Steel sleeve overcoat, concrete perfusion between the inwall of Composite Steel sleeve and outer mold forms the concrete structure layer; With the outer mold demoulding;
5) form the reinforcement wire winding layer at the outside reinforcement wire that twines of concrete structure layer;
6) at the cast of reinforcement wire winding layer outside, spray or winding external protection material, be made into external protection; Remove the liner mould, obtain glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes.
The invention has the beneficial effects as follows:
1, adopt the inboard of steel bushing that the frp lining layer is set, promptly glass fibre reinforced plastics is mutually compound with Prestressed concrete cylinder pipe, has both had the corrosion resistant advantage of Glass Steel Tube, has the rigidity height of cylinder concrete pipe, the advantage that intensity is good again.The annular groove face that spigot is placed rubber ring is the glass fibre reinforced plastics plug, has the corrosion resistant advantage of Glass Steel Tube.
2, the left end of glass fibre reinforced plastics plug protrudes the left end of steel bushing, and the left end of the left part parcel steel bushing of transition layer has avoided the left end of steel bushing exposed outside, has corrosion resistant advantage.Adopt the right-hand member of the right-hand member protrusion steel bushing of frp lining layer, the right-hand member of the right part parcel steel bushing of transition layer has avoided the right-hand member of steel bushing exposed outside, has corrosion resistant advantage.
3, the inwall of pipeline adopts the frp lining layer, and the roughness coefficien of inwall is less, and is little to the influence of the flow of pipeline.
Description of drawings
Fig. 1 is the schematic representation (making frp lining on the liner mould) of liner mould of the present invention;
Fig. 2 adopts the schematic representation that twines the steel bushing compound socket of making outside the socket steel bushing for the present invention;
Fig. 3 is the schematic representation of bellmouth steel bushing of the present invention;
Fig. 4 is the schematic representation of Composite Steel sleeve of the present invention (integral body);
Fig. 5 pours into the schematic representation of transition layer between frp lining layer and steel bushing for the present invention;
Fig. 6 twines the schematic representation of reinforcement wire (reinforcing bar) in concrete structure layer appearance for the present invention;
Fig. 7 is the structural representation of glass fibre reinforced plastics of the present invention and prestress steel cylinder concrete composite pipes;
Fig. 8 twines the winding process schematic representation of making the steel bushing compound socket for the present invention adopts outside the socket steel bushing;
Fig. 9 is the trim process schematic representation of the present invention on the glass steel part;
Among the figure: 1-socket, 2-emery wheel, 3-bellmouth, 4-socket end face, 5-bellmouth end face, 6-frp lining layer, 7-transition layer, 8-steel bushing, 9-concrete structure layer, 10-reinforcement wire winding layer, the 11-external protection, 12-trimming apparatus, 13-glass fibre reinforced plastics plug, 14-glass steel part; 15-liner mould, 16-socket steel bushing, 17-pipe shaft steel bushing, 18-annular groove, 19-bellmouth steel bushing, 20-worktable; 21-glass fibre wind, 22-glass fibre, 23-glasscloth, 24-glasscloth wind, 25-socket steel bushing mould.
Embodiment
Further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
As shown in Figure 7, glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes, it comprises Prestressed concrete cylinder pipe, frp lining layer 6, transition layer 7; The material of transition layer 7 is a resin mortar; Prestressed concrete cylinder pipe comprises steel bushing 8, concrete structure layer 9, reinforcement wire winding layer 10, external protection 11, the outer side surface of steel bushing 8 is perfused with concrete structure layer 9, the outer side surface of concrete structure layer 9 is wound with reinforcement wire winding layer 10, reinforcement wire winding layer 10 outsides are manufactured with external protection 11, the material of external protection 11 is a resin mortar, and external protection 11 links into an integrated entity with reinforcement wire winding layer 10; The right part of Prestressed concrete cylinder pipe is bellmouth (the right of Fig. 7 is for right, and the left side is a left side), and the left part of Prestressed concrete cylinder pipe is socket (or being called plug); The inboard of steel bushing 8 is provided with frp lining layer 6, is perfused with transition layer (adopting the perfusion resin mortar to form) between frp lining layer 6 and the steel bushing 8, and frp lining layer 6 is linked into an integrated entity by transition layer 7 with steel bushing 8; The outer side surface of the left part of steel bushing 8 (being spigot) is set with the glass fibre reinforced plastics plug 13 of annular, and the outer side surface of glass fibre reinforced plastics plug 13 is provided with 2～5 road annular grooves 18 (whether the quantity of annular groove and the form of rubber ring bear interior the pressure by pipeline is selected to determine).
The right-hand member of frp lining layer 6 protrudes the right-hand member 0.1cm～3cm of steel bushing 8, the right-hand member of the right part parcel steel bushing 8 of transition layer 7; Left end 0.1cm～3cm that the left end of glass fibre reinforced plastics plug 13 protrudes steel bushing 8 (is the glass fibre reinforced plastics plug socket end 0.1cm that exceeds steel bushing～3cm); The left end of frp lining layer 6 protrudes the left end 0.1cm～3cm of steel bushing 8, the left end of the left part parcel steel bushing 8 of transition layer 7.
Described steel bushing 8 is made up of socket steel bushing 16, pipe shaft steel bushing 17, bellmouth steel bushing 19.Glass fibre reinforced plastics plug 13 is fixedly installed on the left part (constituting the steel bushing compound socket) of socket steel bushing 16, the left end welding of the right-hand member of socket steel bushing 16 and pipe shaft steel bushing 17, the left end welding of the right-hand member of pipe shaft steel bushing 17 and bellmouth steel bushing 19.The left part of steel bushing 8 is established glass fibre reinforced plastics plug 13 and is constituted Composite Steel sleeve of the present invention.
The left side of frp lining layer 6, transition layer 7, glass fibre reinforced plastics plug 13 is positioned at (with the axis normal of composite pipe) on the same vertical surface.The right-hand member of the right part parcel reinforcement wire winding layer 10 of external protection 11; The right side of frp lining layer 6, transition layer 7, concrete structure layer 9, external protection 11 is positioned at (being that bellmouth end face 5 is vertical, with the axis normal of composite pipe) on the same vertical surface.The left end of the left part parcel reinforcement wire winding layer 10 of external protection 11, the left side of concrete structure layer 9, external protection 11 (being that socket end face 4 is vertical) in the same plane with the axis normal of composite pipe.The left end of steel bushing 8 protrudes the left end 2cm～50cm of concrete structure layer 9; The right part of glass fibre reinforced plastics plug 13 is watered and is filled in the concrete structure layer 9.
The thickness of frp lining layer 6 is 0.1cm～2cm; the thickness of transition layer 7 is 0.5cm～20cm; the thickness of steel bushing 8 is 0.1cm～2cm; the thickness of concrete structure layer 9 is 1cm～40cm; the thickness of reinforcement wire winding layer 10 (being the diameter of reinforcement wire) is 0.2cm～2cm, and the thickness of external protection 11 is 0.1cm～3cm.The length of composite pipe is 100cm～1000cm (10 meters), and the diameter of steel bushing 8 is 80cm～500cm (5 meters), and concrete size is determined as required.
The preparation process of above-mentioned glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes, it comprises the steps:
1) making of Composite Steel sleeve: steel bushing 8 is made up of socket steel bushing 16, pipe shaft steel bushing 17, bellmouth steel bushing 19; Adopt winding process to make glass steel part 14 at the left part outer side surface of socket steel bushing 16, left end 0.1cm～3cm that the left end of glass steel part 14 protrudes socket steel bushing 16 (is the glass fibre reinforced plastics plug socket end 0.1cm that exceeds steel bushing～3cm); On glass steel part 14, open 2～5 road annular grooves 18 (quantity of annular groove is annular groove among Fig. 2 of present embodiment according to whether having pressure to determine) then, form the compound steel cylinder outlet structure of glass fibre reinforced plastics (as shown in Figure 2); With the left end welding of the right-hand member and the pipe shaft steel bushing 17 of the socket steel bushing 16 of the compound steel cylinder outlet structure of glass fibre reinforced plastics, the left end welding of the right-hand member of pipe shaft steel bushing 17 and bellmouth steel bushing 19 forms Composite Steel sleeve (the Composite Steel sleeve of forming integral body); As Fig. 2, Fig. 3, Fig. 4, Fig. 8, shown in Figure 9;
2) adopt winding process to make frp lining layer 6 on liner mould 15, the left part of frp lining layer 6 is made into the shape of socket 1, and the right part of frp lining layer 6 is made into the shape of bellmouth 3; The right-hand member of frp lining layer 6 protrudes the right-hand member 0.1cm～3cm of bellmouth steel bushing 19, and the left end of frp lining layer 6 protrudes the left end 0.1cm～3cm of socket steel bushing 16;
3) as shown in Figure 5, liner mould 15 stood in (bellmouth is downward on the worktable 20, frp lining layer 6 is fixed on the liner mould 15 at this moment), liner mould 15 and worktable 20 fixing (the female end axle by liner mould 15 screws on hold-doun nut and worktable 20 fixing and lockings); With the composite steel sleeve jacket casing outside frp lining layer 6, Composite Steel sleeve and worktable 20 are fixing, form the transition layer chamber that annular port is arranged up and down between frp lining layer 6 and the Composite Steel sleeve, form transition layer 7 to transition layer chamber perfusion resin mortar (buffer layer material); The left end of the left part parcel steel bushing 8 of transition layer 7, the right-hand member of the right part parcel steel bushing 8 of transition layer 7;
4) at outer mold of Composite Steel sleeve overcoat, concrete perfusion between the inwall of Composite Steel sleeve and outer mold, and carry out concrete curing and handle, form concrete structure layer 9; With the outer mold demoulding;
5) as shown in Figure 6, form reinforcement wire winding layer 10 at the concrete structure layer 9 outside reinforcement wire (reinforcing bar) that twines;
6) at reinforcement wire winding layer 10 outside casting resin mortars (external protection material), and carry out press polish and handle, be made into external protection; The right-hand member of the right part parcel reinforcement wire winding layer 10 of external protection 11, the left end of the left part parcel reinforcement wire winding layer 10 of external protection 11; Remove liner mould 15, obtain glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes.
The preparation process of the compound steel cylinder outlet structure of glass fibre reinforced plastics: as Fig. 8, shown in Figure 9,
1), in the front side of cylindrical rotatable socket steel bushing mould 25 left parts (below among Fig. 8 is the front side, and the top is a rear side) glass fibre wind 21 is set, the rear side of socket steel bushing mould 25 left parts is provided with glasscloth wind 24; Glass fibre wind 21 comprises creel, steeping vat etc., and the glasscloth wind has pre-bath unit;
2), the socket steel bushing 16 that at first with length is 10cm～100cm is set on the socket steel bushing mould 25 also fixing, glass fibre wind 21 will twine in the left part of socket steel bushing 16 through the glass fibre 22 of pre-soaked resin (resin is in steeping vat), glasscloth wind 24 will twine that (length of twining is 5cm～80cm) through the glasscloth 23 of pre-soaked resin (resin is in gumming device) on the socket steel bushing in the left part of socket steel bushing 16, form glass steel part 14 after twining 1cm～20cm thickness, the left end of glass steel part 14 protrudes the left end 0.1cm～3cm of socket steel bushing.
3) adopt the trimming apparatus 12 of band emery wheel 2 on glass steel part 14, to repair formation 2～5 road annular grooves 18 (as shown in Figure 2 then, among Fig. 2 be 3), it (is the glass fibre reinforced plastics plug 13 socket end 0.1cm that exceeds the socket steel bushing～3cm) that glass steel part 14 forms glass fibre reinforced plastics plugs 13; 1～2 road annular groove of glass fibre reinforced plastics plug 13 right-hand members is used to place rubber ring and carries out joint sealing, and the groove of glass fibre reinforced plastics plug 13 left ends is used for combining closely with the pipe shaft of glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes; Just formed a compound steel cylinder outlet structure of glass fibre reinforced plastics (promptly by glass fibre reinforced plastics plug 13 and 16 compound compositions of socket steel bushing) after the last whole demoulding.
Manufacturing material, making equipment, the preparation process of glass fibre reinforced plastics (frp lining layer 6, glass steel part 14) can all adopt existing known technology.
Embodiment 2:
Substantially the same manner as Example 1, difference is: the material of transition layer is concrete (with concrete instead of resins mortar).
Embodiment 3:
Substantially the same manner as Example 1, difference is: the material of external protection is slush (with slush instead of resins mortar), adopts the spraying cement mortar in reinforcement wire winding layer 10 outsides.
Embodiment 4:
Substantially the same manner as Example 1, difference is: the material of external protection is glass fibre reinforced plastics (with glass fibre reinforced plastics instead of resins mortar), adopts fw frp in reinforcement wire winding layer 10 outsides.
Embodiment 5:
Substantially the same manner as Example 1, difference is: the material of external protection is thermoplastic material (with thermoplastic material instead of resins mortar).
Claims (1)
1. the preparation process of glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes, described glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes comprise Prestressed concrete cylinder pipe; Prestressed concrete cylinder pipe comprises steel bushing (8), concrete structure layer (9), reinforcement wire winding layer (10), external protection (11), described steel bushing is made of socket steel bushing, pipe shaft steel bushing and bellmouth steel bushing, the outer side surface of steel bushing (8) is perfused with concrete structure layer (9), the outer side surface of concrete structure layer (9) is wound with reinforcement wire winding layer (10), and reinforcement wire winding layer (10) outside is manufactured with external protection (11); The right part of Prestressed concrete cylinder pipe is a bellmouth, and the left part of Prestressed concrete cylinder pipe is a socket; The inboard of steel bushing (8) is provided with frp lining layer (6), is provided with transition layer between frp lining layer (6) and the steel bushing (8); The outer side surface of the left part of steel bushing (8) is set with the glass fibre reinforced plastics plug (13) of annular, and the outer side surface of glass fibre reinforced plastics plug (13) is provided with 2～5 road annular grooves (18);
It is characterized in that it comprises the steps:
1) making of Composite Steel sleeve: the left part outer side surface at socket steel bushing (16) adopts winding process to make the glass steel part, opens 2～5 road annular grooves (18) then on the glass steel part, forms the compound steel cylinder outlet structure of glass fibre reinforced plastics; With the left end welding of the right-hand member and the pipe shaft steel bushing (17) of the socket steel bushing (16) of the compound steel cylinder outlet structure of glass fibre reinforced plastics, the left end welding of the right-hand member of pipe shaft steel bushing (17) and bellmouth steel bushing (19), formation Composite Steel sleeve; The right part of bellmouth steel bushing forms described bellmouth;
2) adopt winding process to go up and make frp lining layer (6) at liner mould (15);
3) liner mould (15) is stood on the worktable (20), liner mould (15) is fixing with worktable (20); With the composite steel sleeve jacket casing outside frp lining layer (6), Composite Steel sleeve and worktable (20) are fixing, form the transition layer chamber that annular port is arranged up and down between frp lining layer (6) and the Composite Steel sleeve, the perfusion buffer layer material forms transition layer (7) to the transition layer chamber;
4) at outer mold of Composite Steel sleeve overcoat, concrete perfusion between the inwall of Composite Steel sleeve and outer mold forms concrete structure layer (9); With the outer mold demoulding;
5) form reinforcement wire winding layer (10) at the outside reinforcement wire that twines of concrete structure layer (9);
6) at the cast of reinforcement wire winding layer (10) outside, spray or winding external protection material, be made into external protection; Remove liner mould (15), obtain glass fibre reinforced plastics and prestress steel cylinder concrete composite pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100611589A CN101498390B (en) | 2009-03-17 | 2009-03-17 | Glass fibre reinforced plastic and prestress steel cylinder concrete composite pipes and manufacturing process thereof |
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| CN2009100611589A CN101498390B (en) | 2009-03-17 | 2009-03-17 | Glass fibre reinforced plastic and prestress steel cylinder concrete composite pipes and manufacturing process thereof |
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| CN101498390A CN101498390A (en) | 2009-08-05 |
| CN101498390B true CN101498390B (en) | 2011-06-08 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101776187B (en) * | 2010-02-26 | 2012-04-04 | 武汉理工大学 | Prestressed concrete glass fiber reinforced plastic compound tubing structure and manufacture process thereof |
| CN102052524A (en) * | 2011-01-17 | 2011-05-11 | 武汉理工大学 | Prestressed concrete glass reinforced plastic composite pipe and preparation method thereof |
| CN103591393B (en) * | 2013-11-13 | 2015-12-02 | 武汉理工大学 | A kind of glass fibre reinforced plastics prestress steel sleeve concrete plug and preparation method thereof |
| CN104401018B (en) * | 2014-11-17 | 2017-01-04 | 云峰管业有限公司 | A kind of reinforced plastic glass fibre concrete composite pipe produces equipment |
| CN105856602A (en) * | 2016-04-26 | 2016-08-17 | 中国海洋石油总公司 | Manufacturing technology for cold-preserving and heat-insulating sleeve of full-capacity liquefied natural gas storage tank |
| CN105927806A (en) * | 2016-07-11 | 2016-09-07 | 陕西东泽高科实业有限公司 | Dual steel bell and spigot joint concrete pipe production and assembly structure and production technology |
| CN108253203A (en) * | 2016-12-28 | 2018-07-06 | 北京市水利规划设计研究院 | Pipeline and its component |
| CN108724446A (en) * | 2018-07-04 | 2018-11-02 | 重庆四通八达管业有限公司 | A kind of pre-stress glass fibre reinforced plastic inner lining concrete push pipe and its preparation process |
| CN108799639A (en) * | 2018-07-04 | 2018-11-13 | 重庆四通八达管业有限公司 | A kind of frp lining concrete supplying drainage and its preparation process |
| CN109130242B (en) * | 2018-08-10 | 2021-07-06 | 单卫军 | Manufacturing method of glass fiber reinforced plastic lining composite steel pipe and sealing and connecting structure |
| CN109555909B (en) * | 2019-01-22 | 2023-09-19 | 四川牧雨环保科技有限公司 | Double-wall inner rib glass fiber reinforced plastic sandwich concrete high-strength composite pipeline and processing method thereof |
| CN111271529A (en) * | 2019-12-20 | 2020-06-12 | 漳州明威建材发展有限公司 | Reinforced concrete pipe and manufacturing process thereof |
| CN111873503A (en) * | 2020-07-24 | 2020-11-03 | 泸州川西化玻璃钢有限公司 | Production process of socket glass fiber reinforced plastic pipeline |
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| US3963056A (en) * | 1974-01-02 | 1976-06-15 | Nippon Concrete Kogyo Kabushiki Kaisha | Concrete piles, poles or the like |
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| CN101498390A (en) | 2009-08-05 |
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