CN112297216A - Prestressed galvanized steel pipe-concrete composite electric pole and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of electric poles, and discloses a prestressed galvanized steel pipe-concrete composite electric pole and a preparation method thereof. The composite hollow structure is mainly formed by centrifugally forming the galvanized steel pipe and the concrete, fully exerts the characteristics of good mechanical property and good corrosion resistance of the galvanized steel pipe and the concrete, improves the overall performance of the structure, has the advantages of simple structure forming, strong bearing capacity, large rigidity, good impact resistance, collapse prevention, stronger corrosion resistance and better corrosion resistance to atmosphere, water, acid, alkali, salt and various solvents with common concentration compared with the traditional composite pole structure. The invention solves the problems of insufficient bending moment, poor freezing resistance, poor corrosion resistance of the steel pipe pole and high manufacturing cost of the traditional concrete pole.

Description

Prestressed galvanized steel pipe-concrete composite electric pole and preparation method thereof

Technical Field

The invention relates to the technical field of electric poles, in particular to a prestressed galvanized steel pipe-concrete composite electric pole and a preparation method thereof.

Background

The development of transmission line towers in China has a history of over a hundred years, wherein the first square solid concrete electric pole produced in China in 1924 has a history of nearly 80 years.

The electric pole in the prior art is mostly of a reinforced concrete structure, has low manufacturing cost and mature construction and installation technology, and is widely applied to power transmission lines of various domestic voltage classes. However, this structure also has certain limitations: (1) the concrete is a brittle material, has low tensile strength, is easy to crack and has poor capability of resisting natural disasters; (2) the concrete has low unit density bearing capacity and large dead weight of the concrete pole, and is not beneficial to transportation and construction; (3) under natural environment, the inside reinforcing bar of concrete is perishable, shortens life. 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.

Aiming at the current situation, a novel electric pole with good mechanical property, durability and corrosion resistance can be developed, and the problem that the application of the existing concrete annular electric pole is limited is solved.

Disclosure of Invention

In view of the above, the invention provides a prestressed galvanized steel pipe-concrete composite pole with good toughness, good mechanical properties, large bending moment, good durability, good impact resistance, anti-collision and anti-collapse, and good corrosion resistance and a preparation method thereof, in order to overcome at least one of the defects in the prior art; the problems of large brittleness, great self weight, poor corrosion resistance and the like of a common annular concrete pole are solved.

In order to solve the technical problems, the invention adopts the following technical scheme:

a prestressed galvanized steel pipe-concrete composite electric pole comprises a galvanized steel pipe and a concrete layer poured on the inner wall of the galvanized steel pipe, wherein a prestressed reinforcement framework is planted in the concrete layer.

The galvanized steel pipe-concrete composite pole with the hollow outer-wrapped steel structure is manufactured by introducing the galvanized steel pipe, so that the characteristics of good mechanical property and good corrosion resistance of the galvanized steel pipe and the concrete are fully exerted, the overall performance of the structure is improved, compared with the traditional composite pole, the composite pole is simple in structure forming, strong in bearing capacity, large in rigidity, good in impact resistance, capable of preventing collapse due to collision, strong in corrosion resistance, and good in corrosion resistance to atmosphere, water, acid, alkali, salt and various solvents with common concentrations. The invention solves the problems of insufficient bending moment, poor freezing resistance, poor corrosion resistance of the steel pipe pole and high manufacturing cost of the traditional concrete pole.

The problem of interface combination between the galvanized steel pipe and the concrete layer is determined by the inherent properties of the galvanized steel pipe and the concrete layer, so that the bearing capacity and bending moment of the electric pole with the galvanized steel structure coated outside the concrete are poor, and the deflection deformation is large, which is also a big problem in the research process of the invention. According to the invention, the inner wall of the galvanized steel pipe is provided with the plurality of shear nails extending into the concrete layer, one ends of the shear nails are connected to the inner wall of the galvanized steel pipe in a welding mode and the like, and the other ends of the shear nails extend into the concrete layer, so that the interface bonding capacity between the galvanized steel pipe and the concrete layer is improved to a greater extent, the bearing force bending moment is greatly improved, the deflection deformation is greatly reduced, and the mechanical property of the electric pole is greatly improved. Preferably, the row spacing between the shear nails is 20-30 mm, and the length is 6-12 mm, so that the concrete layer can be better combined with the galvanized steel pipe, and the bearing capacity bending moment of the electric pole is further improved.

The thickness of the galvanized steel pipe is 1.5-3 mm, and the thickness of the galvanized layer of the galvanized steel pipe is 20-40 mu m.

Galvanized steel pipe has the preformed hole of in bank along length direction reservation, the galvanized steel pipe inner wall welding that the preformed hole corresponds has the nut, and the galvanized steel pipe inner wall that the preformed hole corresponds is fixed to the one end of nut, and the other end extends to the concrete layer that the preformed hole corresponds in, can be used to fixed cat ladder. Preferably, the aperture of the preformed holes is 14-20 mm, and the row spacing is 200-300 mm; the inner diameter of the nut is 14-20 mm, and the length of the nut is 30-100 mm.

The thickness of the concrete layer is 30-100 mm; the distance between the prestressed reinforcement framework and the inner wall of the galvanized steel pipe is 15-18 mm or more than the diameter of a reinforcement forming the prestressed reinforcement framework. Constitute steel reinforcement of framework of steel reinforcement includes the vertical reinforcing bar that extends along pole length direction, does not include with pole length direction vertically horizontal reinforcing bar, has both saved 30% ~ 50% arrangement of reinforcement volume, has improved concrete layer's mechanical properties again to improve the whole mechanical properties of pole.

The concrete layer comprises the following components in parts by weight: 25-50 parts of cement, 10-20 parts of admixture, 50-70 parts of fine aggregate, 90-110 parts of coarse aggregate, 0.8-1.4 parts of polycarboxylic acid water reducing agent and 0.28-0.42 of water-to-glue ratio.

A method for preparing the prestressed galvanized steel pipe-concrete composite electric pole comprises the following steps:

s1, preparing an electric pole mould, placing a galvanized steel pipe in a lower mould of the electric pole mould, fixing a prestressed reinforcement framework in the galvanized steel pipe, closing an upper mould of the electric pole mould, and assembling the mould for later use;

s2, putting all cement, admixture and fine aggregate used for manufacturing a concrete layer into a stirrer according to a ratio, stirring for 60-120 seconds, putting all water reducing agent and water into the stirrer, stirring for 60-120 seconds, and finally putting coarse aggregate into the stirrer, stirring for 30-90 seconds to obtain a concrete mixture;

s3, pumping the concrete mixture obtained in the step S2 into a galvanized steel pipe assembled in the pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite pole with the mold;

s4, standing the composite electric pole with the mould obtained in the step S3 at room temperature for 1-2 hours, and putting the composite electric pole into a curing kiln at the temperature of 80-90 ℃ for steam curing for 8-16 hours;

and S5, carrying out reinforcing steel bar stretching and demoulding on the composite electric pole subjected to steam curing in the step S4, and then putting the finished end enclosure into a storage yard for natural curing for 7-14 days.

Preferably, the slump of the concrete mixture in the step S2 is 40-180 mm, and the compressive strength of the concrete mixture after steam curing in the step S4 is not lower than 40 MPa.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the technical scheme, the prestressed galvanized steel pipe-concrete composite electric pole has the advantages that the galvanized steel pipe is arranged on the outer layer, so that the composite electric pole is good in toughness, good in impact resistance and good in anti-collision collapse performance, the bending moment of the composite electric pole is improved, and the composite electric pole is basically not reacted with erosion components in the environment.

(2) The prestressed galvanized steel pipe-concrete composite pole structure related to the technical scheme of the invention cancels circumferential reinforcement, reduces the overall reinforcement amount by 30-50%, and can be used for manufacturing a connecting rod, and the connecting part can be welded; the problems of large brittleness, large self weight and inconvenient carrying of the concrete pole are effectively solved, and the manufacturing process is simple.

Drawings

Fig. 1 is a longitudinal sectional view of a prestressed galvanized steel pipe-concrete composite pole.

Fig. 2 is an enlarged sectional view a-a of the prestressed galvanized steel pipe-concrete composite pole shown in fig. 1.

Description of reference numerals: the steel pipe comprises a galvanized steel pipe 100, a preformed hole 110, shear nails 120, a concrete layer 200, nuts 210 and a prestressed reinforcement framework 220.

Detailed Description

The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention. The present invention will be described in further detail with reference to specific examples.

Example 1

Referring to fig. 1-2, the K-grade prestressed galvanized steel pipe-concrete composite electric pole with a slight diameter of 190mm and a length (L) of 10m comprises a galvanized steel pipe 100 and a concrete layer 200 poured on the inner wall of the galvanized steel pipe 100, wherein the thickness t1 of the galvanized steel pipe 100 is 1.5mm, the thickness of the galvanized layer is 20 microns, and the thickness t2 of the concrete layer 200 is 30 mm.

Galvanized steel pipe 100 has reserved two rows of preformed holes 110 with aperture of 14mm along length direction, and the row spacing between preformed holes 110 is 200mm, and the welded stainless steel nut 210 that the galvanized steel pipe inner wall that preformed hole 110 corresponds has internal diameter 14mm, length 30mm, and the nut 210 of burying in concrete layer 200 in this embodiment is used for fixed cat ladder, and this cat ladder is connected with the nut 210 of reserving in concrete layer 200 through the connecting piece that passes preformed hole 110, like the bolt. It can be understood that the embedded nut 210 can also be used to fix other supporting members, and the embedded nut 210 can also be made of other materials with anti-corrosion function.

In order to improve the interface bonding between the galvanized steel pipe 100 and the concrete layer 200, rows of shear nails 120 are arranged on the inner wall of the galvanized steel pipe 100, and the row spacing between the shear nails 120 is 20mm and the length is 6 mm. It is understood that the shear pins 120 may be connected to the inner wall of the galvanized steel pipe 100 by welding or the like.

The concrete layer 200 comprises the following components in parts by weight: 25-50 parts of cement, 10-20 parts of admixture, 50-70 parts of fine aggregate, 90-110 parts of coarse aggregate, 0.8-1.4 parts of polycarboxylic acid water reducing agent and 0.28-0.42 of water-to-glue ratio. Be equipped with prestressed reinforcement skeleton 220 in concrete layer 200, this prestressed reinforcement skeleton 220 includes the longitudinal reinforcement that extends along pole length direction, does not include the hoop reinforcing bar parallel with the pole cross section, and the distance between longitudinal reinforcement and galvanized steel pipe 100 inner wall is 15mm, or is greater than the bar diameter.

The preparation method of the prestressed galvanized steel pipe-concrete composite electric pole comprises the following steps:

s1, preparing an electric pole mould, placing a galvanized steel pipe in a lower mould of the electric pole mould, fixing a designed prestressed reinforcement framework in the galvanized steel pipe, closing an upper mould of the electric pole mould, screwing down screws, and assembling the mould for later use;

s2, calculating the using amount of each raw material for manufacturing a concrete layer according to the proportion, putting all cement, admixture and fine aggregate into a stirrer to be stirred for 60-120 seconds, then putting all water reducing agent and water into the stirrer to be stirred for 60-120 seconds, and finally putting coarse aggregate into the stirrer to be stirred for 30-90 seconds to obtain a concrete mixture with the slump of 40-180 mm;

s3, pumping the concrete mixture obtained in the step S2 into a galvanized steel pipe assembled in the pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite pole with the mold;

s4, standing the composite electric pole with the mould obtained in the step S3 at room temperature for 1-2 hours, and putting the composite electric pole into a curing kiln at the temperature of 80-90 ℃ for steam curing for 8-16 hours, wherein the compressive strength is not lower than 40 MPa;

and S5, carrying out reinforcing steel bar stretching and demoulding on the composite electric pole subjected to steam curing in the step S4, and then putting the finished end enclosure into a storage yard for natural curing for 7-14 days.

It is understood that in the above preparation method, the order of steps S1 to S2 may be arbitrarily changed.

Example 2

Referring to fig. 1-2, the K-grade prestressed galvanized steel pipe-concrete composite electric pole with a slight diameter of 190mm and a length (L) of 10m comprises a galvanized steel pipe 100 and a concrete layer 200 poured on the inner wall of the galvanized steel pipe 100, wherein the galvanized steel pipe 100 is 3mm thick t1, the galvanized layer is 40 μm thick, and the concrete layer 200 is 100mm thick t 2.

Galvanized steel pipe 100 has two rows of preformed holes 110 with 20mm of aperture along length direction reservation, and the row spacing between preformed holes 110 is 300mm, and the welded stainless steel nut 210 that has internal diameter 20mm, length 100mm of galvanized steel pipe inner wall that preformed hole 110 corresponds has, and the nut 210 of burying in concrete layer 200 in this embodiment is used for fixed cat ladder, and this cat ladder is connected with the nut 210 of reserving in concrete layer 200 through the connecting piece that passes preformed hole 110, like the bolt. It can be understood that the embedded nut 210 can also be used to fix other supporting members, and the embedded nut 210 can also be made of other materials with anti-corrosion function.

In order to improve the interface bonding between the galvanized steel pipe 100 and the concrete layer 200, rows of shear nails 120 are arranged on the inner wall of the galvanized steel pipe 100, and the row spacing between the shear nails 120 is 30mm and the length is 12 mm. It is understood that the shear pins 120 may be connected to the inner wall of the galvanized steel pipe 100 by welding or the like.

The concrete layer 200 comprises the following components in parts by weight: 25-50 parts of cement, 10-20 parts of admixture, 50-70 parts of fine aggregate, 90-110 parts of coarse aggregate, 0.8-1.4 parts of polycarboxylic acid water reducing agent and 0.28-0.42 of water-to-glue ratio. Be equipped with prestressing steel skeleton 220 in concrete layer 200, this prestressing steel skeleton 220 includes the longitudinal reinforcement that extends along pole length direction, does not include the hoop reinforcing bar parallel with the pole cross section, and the distance between longitudinal reinforcement and galvanized steel pipe 100 inner wall is 18mm, or is greater than the reinforcing bar diameter.

The preparation method of the prestressed galvanized steel pipe-concrete composite electric pole comprises the following steps:

s1, preparing an electric pole mould, placing a galvanized steel pipe in a lower mould of the electric pole mould, fixing a designed prestressed reinforcement framework in the galvanized steel pipe, closing an upper mould of the electric pole mould, screwing down screws, and assembling the mould for later use;

s2, calculating the using amount of each raw material for manufacturing a concrete layer according to the proportion, putting all cement, admixture and fine aggregate into a stirrer to be stirred for 60-120 seconds, then putting all water reducing agent and water into the stirrer to be stirred for 60-120 seconds, and finally putting coarse aggregate into the stirrer to be stirred for 30-90 seconds to obtain a concrete mixture with the slump of 40-180 mm;

s3, pumping the concrete mixture obtained in the step S2 into a galvanized steel pipe assembled in the pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite pole with the mold;

s4, standing the composite electric pole with the mould obtained in the step S3 at room temperature for 1-2 hours, and putting the composite electric pole into a curing kiln at the temperature of 80-90 ℃ for steam curing for 8-16 hours, wherein the compressive strength is not lower than 40 MPa;

and S5, carrying out reinforcing steel bar stretching and demoulding on the composite electric pole subjected to steam curing in the step S4, and then putting the finished end enclosure into a storage yard for natural curing for 7-14 days.

It is understood that in the above preparation method, the order of steps S1 to S2 may be arbitrarily changed.

Example 3

Referring to fig. 1-2, the K-grade prestressed galvanized steel pipe-concrete composite electric pole with the slight diameter of 190mm and the length (L) of 10m comprises a galvanized steel pipe 100 and a concrete layer 200 poured on the inner wall of the galvanized steel pipe 100, wherein the thickness t1 of the galvanized steel pipe 100 is 2.2mm, the thickness of the galvanized layer is 30 microns, and the thickness t2 of the concrete layer 200 is 65 mm.

Two rows of reserved holes 110 with the aperture of 17mm are reserved in the galvanized steel pipe 100 along the length direction, the row spacing between the reserved holes 110 is 250mm, stainless steel nuts 210 with the inner diameter of 17mm and the length of 65mm are welded on the inner wall of the galvanized steel pipe corresponding to the reserved holes 110, the nuts 210 which are pre-buried in the concrete layer 200 are used for fixing the ladder stand, and the ladder stand is connected with the nuts 210 reserved in the concrete layer 200 through connecting pieces, such as bolts, penetrating through the reserved holes 110. It can be understood that the embedded nut 210 can also be used to fix other supporting members, and the embedded nut 210 can also be made of other materials with anti-corrosion function.

In order to improve the interface bonding between the galvanized steel pipe 100 and the concrete layer 200, rows of shear nails 120 are arranged on the inner wall of the galvanized steel pipe 100, and the row spacing between the shear nails 120 is 25mm and the length is 9 mm. It is understood that the shear pins 120 may be connected to the inner wall of the galvanized steel pipe 100 by welding or the like.

The concrete layer 200 comprises the following components in parts by weight: 25-50 parts of cement, 10-20 parts of admixture, 50-70 parts of fine aggregate, 90-110 parts of coarse aggregate, 0.8-1.4 parts of polycarboxylic acid water reducing agent and 0.28-0.42 of water-to-glue ratio. Be equipped with prestressing steel skeleton 220 in concrete layer 200, this prestressing steel skeleton 220 includes the longitudinal reinforcement that extends along pole length direction, does not include the hoop reinforcing bar parallel with the pole cross section, and the distance between longitudinal reinforcement and galvanized steel pipe 100 inner wall is 16.5mm, or is greater than the reinforcing bar diameter.

The preparation method of the prestressed galvanized steel pipe-concrete composite electric pole comprises the following steps:

s1, preparing an electric pole mould, placing a galvanized steel pipe in a lower mould of the electric pole mould, fixing a designed prestressed reinforcement framework in the galvanized steel pipe, closing an upper mould of the electric pole mould, screwing down screws, and assembling the mould for later use;

s2, calculating the using amount of each raw material for manufacturing a concrete layer according to the proportion, putting all cement, admixture and fine aggregate into a stirrer to be stirred for 60-120 seconds, then putting all water reducing agent and water into the stirrer to be stirred for 60-120 seconds, and finally putting coarse aggregate into the stirrer to be stirred for 30-90 seconds to obtain a concrete mixture with the slump of 40-180 mm;

s3, pumping the concrete mixture obtained in the step S2 into a galvanized steel pipe assembled in the pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite pole with the mold;

s4, standing the composite electric pole with the mould obtained in the step S3 at room temperature for 1-2 hours, and putting the composite electric pole into a curing kiln at the temperature of 80-90 ℃ for steam curing for 8-16 hours, wherein the compressive strength is not lower than 40 MPa;

and S5, carrying out reinforcing steel bar stretching and demoulding on the composite electric pole subjected to steam curing in the step S4, and then putting the finished end enclosure into a storage yard for natural curing for 7-14 days.

It is understood that in the above preparation method, the order of steps S1 to S2 may be arbitrarily changed.

Comparative example 1

A class K prestressed concrete pole having a tip diameter of 190mm and a length of 10m and a method for manufacturing the same were the same as those of example 1 except that no galvanized steel pipe was used.

Comparative example 2

A K-grade prestressed concrete pole with a small diameter of 190mm and a length of 10m and a preparation method thereof are the same as those in the embodiment 1 except that no shear nail is arranged on the inner wall of a galvanized steel pipe.

The performance test of the K-grade prestressed electric pole with the slight diameter of 190mm and the length of 10m prepared in the examples 1 to 3 and the comparative examples 1 to 2 is carried out according to GB4623-2014 annular concrete electric pole, and the test results are shown in Table 1.

TABLE 1 test result of mechanical properties of K-grade prestressed electric pole with diameter of 190mm and length of 10m

From table 1, comparative example 1 has no galvanized steel pipe, and compared with example 1, the bearing capacity bending moment is reduced more, and the crack width and deflection deformation are increased more; comparative example 2 the galvanized steel pipe has no shear nails on the inner wall, and compared with the example 1, the bearing capacity and bending moment are reduced more, the appearance cracks are basically unchanged, and the deflection deformation is increased more. Through a large number of tests, the galvanized steel pipe outer cylinder is combined with concrete, so that the rigidity and the bearing force bending moment of the composite electric pole are improved, and the mechanical property of the electric pole is improved; the shear nails improve the interface bonding force between the galvanized steel pipe and the concrete and improve the mechanical property of the electric pole.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The prestressed galvanized steel pipe-concrete composite electric pole is characterized by comprising a galvanized steel pipe and a concrete layer poured on the inner wall of the galvanized steel pipe, wherein a prestressed reinforcement framework is planted in the concrete layer.

2. The prestressed galvanized steel pipe-concrete composite electric pole as recited in claim 1, wherein rows of shear nails are arranged on the inner wall of the galvanized steel pipe.

3. The prestressed galvanized steel pipe-concrete composite electric pole as recited in claim 2, wherein the pitch of the shear nails is 20-30 mm and/or the length is 6-12 mm.

4. The prestressed galvanized steel pipe-concrete composite electric pole as claimed in any one of claims 1 to 3, wherein the thickness of the galvanized steel pipe is 1.5 to 3mm, and/or the thickness of the galvanized layer of the galvanized steel pipe is 20 to 40 μm.

5. The prestressed galvanized steel pipe-concrete composite electric pole as recited in any one of claims 1 to 3, wherein rows of reserved holes are reserved in the galvanized steel pipe along the length direction, and nuts are welded to the inner walls of the galvanized steel pipes corresponding to the reserved holes.

6. The prestressed galvanized steel pipe-concrete composite electric pole as recited in claim 5, wherein the aperture of the prepared hole is 14-20 mm, and the pitch is 200-300 mm; and/or the inner diameter of the nut is 14-20 mm, and the length of the nut is 30-100 mm.

7. The prestressed galvanized steel pipe-concrete composite electric pole as recited in any one of claims 1 to 3, wherein the thickness of the concrete layer is 30 to 100 mm; or the distance between the prestressed reinforcement framework and the inner wall of the galvanized steel pipe is 15-18 mm or more than the diameter of the steel bars forming the prestressed reinforcement framework.

8. The prestressed galvanized steel pipe-concrete composite electric pole as claimed in any one of claims 1 to 3, wherein the concrete layer comprises the following components in parts by weight: 25-50 parts of cement, 10-20 parts of admixture, 50-70 parts of fine aggregate, 90-110 parts of coarse aggregate, 0.8-1.4 parts of polycarboxylic acid water reducing agent and 0.28-0.42 of water-to-glue ratio.

9. A preparation method of the prestressed galvanized steel pipe-concrete composite electric pole as claimed in any one of claims 2 to 8, characterized by comprising the following steps:

s1, preparing an electric pole mould, placing a galvanized steel pipe in a lower mould of the electric pole mould, fixing a prestressed reinforcement framework in the galvanized steel pipe, closing an upper mould of the electric pole mould, and assembling the mould for later use;

s2, putting all cement, admixture and fine aggregate used for manufacturing a concrete layer into a stirrer according to a ratio, stirring for 60-120 seconds, putting all water reducing agent and water into the stirrer, stirring for 60-120 seconds, and finally putting coarse aggregate into the stirrer, stirring for 30-90 seconds to obtain a concrete mixture;

s3, pumping the concrete mixture obtained in the step S2 into a galvanized steel pipe assembled in the pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite pole with the mold;

s4, standing the composite electric pole with the mould obtained in the step S3 at room temperature for 1-2 hours, and putting the composite electric pole into a curing kiln at the temperature of 80-90 ℃ for steam curing for 8-16 hours;

and S5, carrying out reinforcing steel bar stretching and demoulding on the composite electric pole subjected to steam curing in the step S4, and then putting the finished end enclosure into a storage yard for natural curing for 7-14 days.

10. The method for preparing the prestressed galvanized steel pipe-concrete composite electric pole as recited in claim 9, wherein slump of the concrete mixture in the step S2 is 40-180 mm, and/or compressive strength after steam curing in the step S4 is not lower than 40 mpa.

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