CN212045296U

CN212045296U - Thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole

Info

Publication number: CN212045296U
Application number: CN202020441366.3U
Authority: CN
Inventors: 李立新; 刘谋荣; 李强; 蒋志超; 余永祥; 徐建国; 余浙云; 何升九; 杨同林; 王茂军; 冯炳; 陈驹
Original assignee: Zhejiang Rong Lin Electrical Equipment Co ltd
Current assignee: Zhejiang Rong Lin Electrical Equipment Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-12-01
Anticipated expiration: 2030-03-31

Abstract

A thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole belongs to the technical field of overhead devices of electric power system transmission lines, is a hollow and axially-through electric pole, and comprises a GFRP pipe layer and an ultra-high performance concrete layer; the GFRP pipe layer is sleeved outside the ultra-high performance concrete layer, and the outer wall of the ultra-high performance concrete layer is attached to the inner wall of the GFRP pipe layer in a centrifugal mode. The thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole has the advantages of light weight, high strength, small deformation, low manufacturing cost, corrosion resistance, ageing resistance, good electrical insulation and no potential safety operation hazard.

Description

Thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole

Technical Field

The utility model belongs to the technical field of electric power system transmission line overhead device, concretely relates to is thin wall centrifugation GFRP pipe ultra high performance concrete composite pole.

Background

The tower structure is an important special supporting structure in basic facilities such as power transmission, communication, railways, airports, municipal administration and the like, and the structural performance of the tower structure directly influences the safety, reliability and economy of a line. At present, electric poles used in domestic overhead transmission lines mainly comprise annular concrete electric poles, steel pipe concrete electric poles and composite material electric poles. The annular concrete electric pole is used in a large amount in power transmission lines of 35kV and below, and is also applied to certain areas of plains and hills with good 110kV line transportation and construction conditions. Steel pipes and steel pipe concrete poles are applied to construction and transformation of power grids with high voltage levels in urban areas in recent years. Composite poles have received increased attention from power systems and have been tried out on line engineering construction in a portion of special areas only in recent years.

The annular concrete pole has low manufacturing cost and mature construction and installation technology, and is widely applied to power transmission lines of various voltage classes in China. However, this structure also has certain limitations: firstly, the concrete is a brittle material, has low tensile strength, is easy to crack and has poor capability of resisting natural disasters; secondly, the concrete has low unit density bearing capacity, and the dead weight of the concrete pole is large, so that the concrete pole is not beneficial to transportation and construction; and thirdly, in a natural environment, the reinforcing steel bars in the concrete are easy to corrode, and the service life is shortened. In addition, when natural disasters such as typhoon, ice disaster, flood, earthquake and the like occur, the rod-falling and line-breaking accidents often occur, the situations of power failure, communication interruption, road block and water cut are caused, and the post-disaster reconstruction work needs to be rapidly carried out. Particularly, the frequency of pole falling of the concrete pole is very high, and the operation safety of a power grid and the safety of equipment and personnel are seriously influenced.

The composite material electric pole is favored by the domestic and foreign electric power industry in recent years due to the advantages of light weight, high strength, corrosion resistance, high and low temperature resistance, good insulating property, lightning protection, pollution prevention and the like. However, composite poles also have some disadvantages: the composite material has anisotropic property and poor compression resistance and bearing capacity; secondly, the composite material has small rigidity, the deflection of the composite material is not easy to control, and the safety of the line operation is easily influenced by overlarge displacement; the composite material has higher manufacturing cost, and the price of a single electric pole is more than 5 times of that of a common concrete electric pole.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defect and not enough that the aforesaid mentioned, and provide thin wall centrifugation GFRP pipe ultra high performance concrete composite pole.

The thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole is a hollow and axially through electric pole and comprises a GFRP pipe layer and an ultra-high performance concrete layer; the GFRP pipe layer is sleeved outside the ultra-high performance concrete layer, and the outer wall of the ultra-high performance concrete layer is attached to the inner wall of the GFRP pipe layer in a centrifugal mode.

As an optimization, thin wall centrifugation GFRP pipe ultra high performance concrete composite pole is the toper pole, and its radius is by pole body top to pole body bottom grow gradually.

Further, the taper of the thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole is 1/75, the tip diameter is phi 150-phi 510mm, and the pole length is 6-27 m.

As another preferred, the thin-wall centrifugal GFRP pipe ultra-high performance concrete composite pole is an equal-diameter pole, and the radius of the pole is equal from the top of the pole body to the bottom of the pole body.

Further, the diameter of the thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole ranges from phi 300-phi 550mm, and the pole length is 3-15 m.

As another preferred mode, the thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole is a step-shaped pole and is integrally and coaxially arranged by at least 2 sections of equal-diameter poles.

The wall thickness of the GFRP tube layer is 3-7 mm; the wall thickness of the ultra-high performance concrete layer is 25-30mm, and the strength grade is C100MPa or above.

The ultra-high performance concrete composite pole with the thin-wall centrifugal GFRP pipe is characterized in that a pole body is made of a thin-wall GFRP glass fiber reinforced plastic pipe manufactured by a WALP forming process, thin-wall ultra-high performance concrete is poured inside the composite pole with a novel composite structure formed by centrifugal forming, the defects of an annular concrete pole and a composite material pole are overcome, the composite pole is a novel reasonable composite structure for a power transmission line pole tower, the tensile strength of GFRP and the compressive strength of the ultra-high performance concrete are fully exerted, the defect that the compressive strength of GFRP and the tensile strength of the ultra-high performance concrete are low is overcome, and the overall working performance of the structure is improved. The pole can be used as a low-voltage-grade transmission line pole, and can also be used as a component on a pole tower of an extra-high voltage large transmission line with a large external load effect.

The thin-wall centrifugal GFRP pipe ultra-high performance concrete composite pole has the advantages of light weight, high strength, small deformation, low manufacturing cost, corrosion resistance, ageing resistance, good electrical insulation, no potential safety operation hazard, easiness in loading, transporting and mounting and the like, and is particularly suitable for distribution network construction, transformation and rush-repair engineering in areas with frequent lightning damage and pollution flashover, serious corrosion, strong wind, difficult pole transportation and assembly and the like.

Drawings

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is a schematic structural view of example 2;

FIG. 3 is a schematic structural view of embodiment 3;

figure 4 is a cross-sectional view of the present pole;

FIG. 5 is a schematic structural view of the present mold and bladder;

in the figure: GFRP pipe layer 1, ultra-high performance concrete layer 2, cope match-mould 3, bed die 4, shelves strip 5, gasbag 6.

Detailed Description

The present patent is described in further detail below with reference to the attached figures.

Definition of terms.

Composite material pole: the pole body is made of composite materials. In the scheme, the composite material refers to glass fiber reinforced plastic (commonly called glass fiber reinforced plastics).

Glass fiber reinforced plastics, and composite materials with glass fiber as a reinforcement and polymer as a matrix.

The ultra-high performance concrete composite pole with the thin-wall centrifugal GFRP pipe is a novel hollow GFRP pipe concrete composite structure pole (composite pole for short) formed by pouring ultra-high performance concrete inside a thin-wall glass fiber reinforced plastic pipe and performing centrifugal molding.

WALP forming process: the glass fiber cloth soaked with unsaturated resin matrix is placed in a forming mould, and the pipe is formed by expansion and compression of compressed air and heating and curing of hot steam.

Ultra-high performance concrete: the super-strong toughened concrete with C100 grade and above is produced by using active powder materials such as cement, mineral admixture and the like, fine aggregate, additive, high-strength fine steel fiber and/or organic synthetic fiber, water and the like. The international technology for preparing high-strength concrete (100MPa) is 'portland cement + silica fume + high-efficiency water reducing agent', which is the prior art, can be applied to the application and is not described any more.

Example 1: a tapered rod.

In this embodiment, this compound pole is cavity and the axial conical rod that link up, and this compound pole's radius is by pole body top to pole body bottom grow gradually.

The composite electric pole comprises a GFRP tube layer 1 and an ultrahigh-performance concrete layer 2; the GFRP tube layer 1 is sleeved outside the ultra-high performance concrete layer 2, and the outer wall of the ultra-high performance concrete layer 2 is centrifugally attached to the inner wall of the GFRP tube layer 1.

The GFRP tube layer 1 is used as an outer layer and is a GFRP tube which is manufactured by adopting a WALP forming process, and the GFRP tube layer 1 is a composite material tube which is formed by placing glass fiber single-diameter cloth soaked with an unsaturated resin matrix in a forming die, expanding and pressing by compressed air and heating and curing by hot steam. The specific steps of the WALP forming process refer to the forming process of the composite electric pole.

The ultra-high performance concrete layer 2 is an inner layer, and is formed by centrifugal molding.

Further: the taper of the composite electric pole is 1/75, the tip diameter is phi 150-phi 510mm, and the pole length is 6-27 m.

Further: the wall thickness of the GFRP tube layer 1 is 3-7 mm; the wall thickness of the ultra-high performance concrete layer 2 is 25-30mm, and the strength grade is C100MPa or above.

Example 2: and (4) a constant diameter rod.

In this embodiment, this compound pole is the equal footpath pole that cavity and axial link up, and this compound pole's radius is all equaled by pole body top to pole body bottom.

Further: the composite electric pole has the diameter of 300-550 mm phi and the pole length of 3-15 m.

Example 3: a stepped rod.

In this embodiment, the composite electric pole is a hollow and axially penetrating stepped pole, and is coaxially arranged by at least 2 sections of equal-diameter poles in an integrated manner.

The forming process of the thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole comprises the following steps:

s1, fabric cutting: cutting the glass fiber cloth to ensure that the width of the glass fiber cloth is not less than half of the perimeter of the composite electric pole;

s2, cleaning the inner wall surface of the mold:

the mold comprises an upper mold 3 and a lower mold 4 which are detachable, and the upper mold 3 and the lower mold 4 are spliced to form a mold cavity for accommodating the GFRP tube layer 1.

The long edges of the upper die 3 and the long edges of the lower die 4 are provided with convex fixing strips, and the fixing strips of the upper die 3 and the fixing strips of the lower die 4 are aligned and then fixedly connected through bolts, so that the upper die 3 is covered and fixed on the lower die 4. The bolts pass through the fixing strips of the upper die 3 and the fixing strips of the lower die 4 and are fixed by nuts.

The end part of the mould is fixedly provided with a baffle strip 5; the stop bars 5 are arranged at intervals.

S2a, carrying out rust removal or impurity removal treatment on the surface of the inner wall of the die: polishing rusty spots and protruding places on the surface of the inner wall of the mold by using a polishing machine provided with a sand paper polishing sheet, and cleaning dust on the surface of the inner wall of the mold;

s2b, coating a release agent on the inner wall surface of the mold: after the mold is dried, a mold release agent is coated on the surface of the inner wall of the mold by a brush or clean cotton cloth in a coating mode, so that a wet film is formed on the surface of the inner wall of the mold, and after the mold is dried, the step of coating is repeated for 2-3 times;

preferably, the release agent is Lubekote 6505 available from Shanghai Lerey curettes Co., Ltd.

S2c, coating a gel coat on the inner wall surface of the mold, namely adding a curing agent and an accelerant into the original gel coat and uniformly stirring to obtain the gel coat; the gel coat is coated on the inner wall of the mold, so that the phenomenon of brush leakage cannot occur, particularly at the joint of the mold;

preferably, the original gel coat is isophthalic acid type gel coat resin; the curing agent is methyl ethyl ketone peroxide; the promoter is cobalt salt; according to parts by weight, curing agent: accelerator (b): original gel coat = 0.5-1: 0.3-1: 100.

s3, preparing the resin glue solution: mixing and uniformly stirring 100 parts of resin, 0.5-1 part of curing agent and 0.3-1 part of accelerator according to parts by weight to obtain a resin glue solution.

Preferably, the resin is m-benzene unsaturated polyester resin; the curing agent is methyl ethyl ketone peroxide; the promoter is cobalt salt.

S4, preparing the airbag 6: the air bag 6 is a flexible bag body provided with an air inlet channel;

fixing two ends of the air bag 6 and filling a proper amount of air into the air bag; and (3) coating a release agent on the surface of the air bag 6, wherein the release agent is uniform and has no omission during coating.

S5, scraping glue: spreading and horizontally placing the glass fiber cloth, scraping the prepared resin glue solution, sequentially overlapping the glass fiber cloth on the glass fiber cloth subjected to glue scraping, and scraping the glue; and putting the glass fiber cloth scraped with the glue solution into a lower die 4, and scraping by using a scraper and ensuring that the left side and the right side are flush with the joint.

S6, placing the airbag 6 on the lower mold 4, and superposing the glass fiber cloth right above the airbag 6: when the air bag 6 is placed into the lower die 4, one end of the air bag 6 is placed into the lower die, and then the whole air bag 6 is placed one by one; when the air bag 6 is placed, the air bag 6 is prevented from pressing and wrinkling the glass fiber cloth of the lower die 4; the glass cloth below the airbag 6 and the glass cloth above overlap each other at a joint.

Preferably, the width of the glass fiber cloth attached to the upper die 3 is half of the perimeter of the composite electric pole, and the width of the glass fiber cloth attached to the lower die 4 is 130-170 mm more than half of the perimeter of the composite electric pole.

S7, mold closing: slowly cover the mould with going up and close to the bed die, notice not need to extrude the fine cloth of glass when the compound die, will go up mould and bed die fixed connection after the compound die finishes.

After the mold is closed, the stop strip 5 is used for stopping the air bag 6 and preventing the axial movement of the air bag 6. The vent tube of the air bag 6 passes through the gap between the barrier strips 5.

S8, heating and curing, and filling steam into the air bag, wherein the air pressure in the air bag is kept to be about 0.1-0.3 MPa all the time; the curing time is 45-60 min, and the glass fiber cloth forms the GFRP tube layer 1.

S9, demolding: after the air in the airbag 6 has been emptied, the upper tool 3 is detached from the lower tool 4, the upper tool 3 is lifted, the lower tool 4 is tilted and the formed GFRP tube layer 1 is removed.

S10, locally performing interface treatment on the inner surface of the GFRP tube layer 1: and (4) coating adhesive on the inner surface of the end part of the GFRP pipe layer 1 and then blasting sand.

Preferably, the adhesive is an unsaturated polyester resin. This interface treatment is favorable to promoting GFRP pipe layer 1, ultra high performance concrete layer 2 and at the conjugation degree of tip, prevents the dislocation between GFRP pipe layer 1, the ultra high performance concrete layer 2 when this composite pole is crooked.

S11, pumping the ultra-high performance concrete layer 2 to the inner wall of the GFRP tube layer 1, and centrifugally forming to obtain the ultra-high performance concrete layer 2 attached to the inner wall of the GFRP tube layer 1, so that the thin-wall centrifugal GFRP tube ultra-high performance concrete composite electric pole is manufactured.

The thin-wall centrifugal GFRP pipe ultra-high performance concrete composite pole is a hollow GFRP pipe concrete component which is formed by pouring ultra-high performance concrete in a thin-wall glass fiber reinforced plastic pipe and performing centrifugal molding, and is a novel power transmission line pole tower which is light in weight, high in strength, corrosion-resistant, ageing-resistant, easy to transport and install, low in cost and high in cost performance. The main characteristics are as follows:

1) the composite structure has super strong performance.

Table 1 summary of composite pole material properties.

Table 2 composite pole mechanical properties summary table (Φ 230X12 tapered pole).

The GFRP pipe layer and the ultra-high performance concrete layer both belong to ultra-high performance composite materials, and the GFRP pipe layer and the ultra-high performance concrete layer are combined to form a composite structure, belong to strong combination and are a true composite electric pole. The composite electric pole is used for replacing a cement pole or a composite electric pole, the bearing capacity can be improved by 1-2 times, the deflection is reduced by more than 50% compared with the composite electric pole, and the requirements of design bearing capacity and deflection can be completely met. In particular, the anti-deformation capability is super strong, the good toughness can resist strong typhoon without falling the pole, but the original shape can be rapidly recovered after the typhoon.

2) Moderate price and easy popularization.

Table 3.110kV pole structural design technical economy comparison.

Adopt autonomic utility model's WALP forming process to make GFRP pipe, greatly reduced manufacturing cost, only about 1/5 of winding pipe to also greatly reduced composite pole's manufacturing cost, made its selling price between concrete pole and combined material pole, change in popularization and application.

3) The self weight is reduced, and the cost is reduced. The composite electric pole has the advantages that the thin-wall GFRP tube layer (the wall thickness is 3-7mm) and the ultra-high performance concrete layer (the wall thickness is 25-30mm) are adopted, the dead weight of the composite electric pole is reduced, the composite electric pole is reduced by more than 30% compared with a cement pole, the transportation and the installation are convenient, and meanwhile, the installation and transportation cost is reduced.

4) Insulating corrosion resistant, the benefit is showing. The GFRP composite material has the advantages of light weight, high strength, corrosion resistance, insulation, ageing resistance, hydrochloric acid resistance and the like, is environment-friendly, convenient to install, free of potential safety hazards in operation, especially insulating, capable of greatly reducing the width of a power transmission line corridor, saving land resources and good in economic benefit and social benefit.

To sum up, the composite pole is a novel composite structure pole between an annular concrete pole and a pure composite material pole, is a novel transmission line pole tower with light weight, high strength, corrosion resistance, ageing resistance, good insulation, easy transportation, easy installation, low cost and high cost performance, is suitable for electric power in mountainous areas, forests, coastal areas, high cold areas, high humidity areas, high salt areas, electric poles of communication and overhead lines of contact networks, illumination pillars, signal machine piles and the like, is particularly suitable for distribution network construction, transformation and rush-repair engineering in areas with frequent lightning damage and pollution flashover, serious corrosion, strong typhoon, difficult transportation and assembly of the electric poles and the like, and has wide application value in the electric power industry.

Compared with an annular concrete pole and a composite pole, the bearing capacity and the rigidity are improved, the manufacturing cost is reduced by more than 60% compared with that of the composite pole, the deformation can be compared with that of the concrete pole, the advantages of the annular concrete pole and the composite pole are kept, and the defects of the annular concrete pole and the composite pole are overcome. If the cable replaces an annular concrete electric pole, the bearing capacity is improved by 50-103%, the deflection is equal to or reduced by 32%, and the weight is reduced by more than 30%. The structure can be formed and shipped in sections and assembled and installed on site, and the installation cost is greatly reduced. If the composite material electric pole is replaced, the bearing capacity is improved by 45%, the deflection is reduced by 54%, the selling price is reduced by 78%, and the economic benefit is considerable.

The novel composite electric pole has the advantages of light weight, high strength, typhoon resistance, environmental aging resistance, corrosion resistance, small deformation, low manufacturing cost, convenient transportation and installation, low maintenance and the like, and the outer protective layer gel coat can be added with various pigments to be made into electric poles with different colors to beautify the environment. The composite electric pole adopting the thin-wall centrifugal GFRP pipe and the ultra-high performance concrete composite structure can effectively solve various flashover problems, improve the safe operation level of a line, greatly reduce the corridor width of a power transmission line, save urban land resources, reduce economic cost and have obvious economic and social benefits.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. The ultra-high performance concrete composite electric pole is characterized by being a hollow and axially through electric pole and comprising a GFRP tube layer (1) and an ultra-high performance concrete layer (2); the GFRP tube layer (1) is sleeved outside the ultra-high performance concrete layer (2), and the outer wall of the ultra-high performance concrete layer (2) is centrifugally attached to the inner wall of the GFRP tube layer (1).

2. The thin-walled centrifugal GFRP pipe ultra-high performance concrete composite pole of claim 1, which is a conical pole with a radius that gradually increases from the top of the pole body to the bottom of the pole body.

3. The thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole of claim 2, wherein the taper is 1/75, the tip diameter is phi 150-phi 510mm, and the pole length is 6-27 m.

4. The thin-walled centrifugal GFRP pipe ultra-high performance concrete composite pole of claim 1, which is an isodiametric pole with a radius equal from the top of the pole body to the bottom of the pole body.

5. The thin-wall centrifugal GFRP pipe ultra-high performance concrete composite electric pole of claim 4, wherein the diameter is from 300 mm to 550mm phi, and the pole length is 3-15 m.

6. The ultra-high performance concrete composite pole of thin-walled centrifugal GFRP pipe of claim 1, which is a stepped pole, and is integrally and coaxially arranged by at least 2 sections of equal diameter poles.

7. The ultra-high performance concrete composite electric pole of the thin-wall centrifugal GFRP pipe as claimed in claim 6, wherein the diameter is from 300 mm to 550mm phi, and the pole length is 3-15 m.

8. The thin-wall centrifugal GFRP tube ultra-high performance concrete composite electric pole as claimed in claim 1, 2, 4 or 6, wherein the wall thickness of the GFRP tube layer (1) is 3-7 mm; the wall thickness of the ultra-high performance concrete layer (2) is 25-30mm, and the strength grade is C100MPa or above.