CN112248213A - Prestressed stainless steel pipe-ultrahigh-performance concrete composite electric pole and preparation method thereof - Google Patents
Prestressed stainless steel pipe-ultrahigh-performance concrete composite electric pole and preparation method thereof Download PDFInfo
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- CN112248213A CN112248213A CN202011017577.5A CN202011017577A CN112248213A CN 112248213 A CN112248213 A CN 112248213A CN 202011017577 A CN202011017577 A CN 202011017577A CN 112248213 A CN112248213 A CN 112248213A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/68—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts and applying centrifugal forces
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/12—Structures made of specified materials of concrete or other stone-like material, with or without internal or external reinforcements, e.g. with metal coverings, with permanent form elements
Abstract
The invention relates to the technical field of electric poles, and discloses a prestressed stainless steel pipe-ultrahigh performance concrete composite electric pole and a preparation method thereof. The composite hollow structure formed by centrifugally forming the stainless steel pipe and the ultrahigh-performance concrete fully plays the characteristics of good mechanical property and good corrosion resistance of the stainless steel pipe and the ultrahigh-performance concrete, improves the overall performance of the structure, is simple to form compared with the traditional composite electric pole structure, has strong bearing capacity, high rigidity, good impact resistance and anti-collision collapse performance, has strong corrosion resistance, has good corrosion resistance to the atmosphere, water, acid, alkali, salt and various solvents with common concentration, and 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 electric pole.
Description
Technical Field
The invention relates to the technical field of electric poles, in particular to a prestressed stainless steel pipe-ultrahigh-performance 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 range of the existing concrete annular electric pole is limited is solved.
Disclosure of Invention
In view of the above, the invention provides a prestressed stainless steel pipe-ultra-high performance concrete composite pole with good toughness, good mechanical properties, large bending moment, good impact resistance, good anti-collapse performance, good durability 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, small bending moment, heavy weight, poor corrosion resistance and the like of the common annular concrete pole are solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the prestressed stainless steel pipe-ultrahigh-performance concrete composite electric pole comprises a stainless steel pipe and an ultrahigh-performance concrete layer poured on the inner wall of the stainless steel pipe, wherein the stainless steel pipe is composed of two half pipes split along the axis, and a prestressed reinforcement framework is planted in the ultrahigh-performance concrete layer.
The stainless steel pipe-ultrahigh performance concrete composite pole with the hollow outer-wrapped steel structure is manufactured by introducing the stainless steel pipe, so that the characteristics of good mechanical property and good corrosion resistance of the stainless steel pipe and the ultrahigh performance 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, high in bearing capacity, high in rigidity, good in shock resistance and anti-collision collapse performance, high in corrosion resistance, and good in corrosion resistance to atmosphere, water, acid, alkali, salt and various solvents with general concentrations, and the problems that the traditional concrete pole is insufficient in bending moment, poor in freezing resistance, poor in corrosion resistance of the steel pipe and high in manufacturing cost are solved.
The stainless steel pipe and the ultra-high performance concrete layer are subjected to interface combination due to inherent properties of the stainless steel pipe and the ultra-high performance concrete layer, so that the bearing capacity and bending moment of the electric pole with the stainless 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 stainless steel pipe is provided with the plurality of shear nails extending into the ultrahigh-performance concrete layer, one ends of the shear nails are connected to the inner wall of the stainless steel pipe in a welding mode and the like, and the other ends of the shear nails extend into the ultrahigh-performance concrete layer, so that the interface bonding capacity between the stainless steel pipe and the ultrahigh-performance 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 ultra-high performance concrete layer can be better combined with the stainless steel pipe, and the bearing capacity bending moment of the electric pole is further improved.
The thickness of the stainless steel pipe is 0.5-1.5 mm.
The stainless steel pipe has the preformed hole of in bank along length direction reservation, the stainless steel pipe inner wall welding that the preformed hole corresponds has the nut, and the stainless steel pipe inner wall that the preformed hole corresponds is fixed to the one end of nut, and the other end extends to in the super high performance concrete layer that the preformed hole corresponds, 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 20-80 mm.
The thickness of the ultra-high performance concrete layer is 20-80 mm; the distance between the prestressed reinforcement framework and the inner wall of the stainless steel pipe is 10-12 mm or more than the diameter of a reinforcement forming the prestressed reinforcement framework. Constitute framework of steel reinforcement includes the longitudinal reinforcement 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 the mechanical properties on super high performance concrete layer again to improve the whole mechanical properties of pole.
The ultra-high performance concrete layer comprises the following components in parts by weight: 40-70 parts of cement, 25-45 parts of admixture, 80-120 parts of fine aggregate, 8-22 parts of steel fiber and 1.8-3.6 parts of polycarboxylic acid water reducing agent.
A method for preparing the prestressed stainless steel pipe-ultrahigh-performance concrete composite electric pole comprises the following steps:
s1, preparing an electric pole mould, respectively placing two half pipes of a stainless steel pipe in an upper mould and a lower mould of the electric pole mould, closing the moulds to fix a prestressed reinforcement framework in the stainless steel pipe, closing an upper mould of the electric pole mould, and assembling the mould for later use;
s2, putting all fine aggregates and steel fibers for manufacturing the ultra-high performance concrete layer into a stirrer according to the proportion, stirring for 60-120 seconds, then putting all cement and admixtures into the stirrer, stirring for 180-240 seconds, and finally putting all water reducing agents and water into the stirrer, and stirring for 360-600 seconds to obtain the ultra-high performance concrete mixture;
s3, pouring the ultra-high performance concrete mixture obtained in the step S2 into a stainless steel pipe assembled in an electric pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite electric 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 ultra-high performance concrete mixture in the step S2 is 160-240 mm, and the compressive strength is not lower than 130 MPa and the bending strength is not lower than 14 MPa after steam curing in the step S4.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the technical scheme, the prestressed stainless steel pipe-ultra-high performance concrete composite electric pole has the advantages that the outer layer is the stainless steel pipe, so that the electric pole is good in toughness, good in impact resistance and good in anti-collision collapse performance, and basically does not react with erosion components in the environment; the inner layer is made of ultra-high performance concrete, the compressive strength is not lower than 130 MPa, the bending strength is not lower than 14 MPa, the design thickness of the outer layer stainless steel pipe is reduced, and the manufacturing cost is saved.
(2) The prestressed stainless steel pipe-ultrahigh-performance concrete composite electric 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 connection rod, and the joint can be welded; the problems of large brittleness, small bending moment, great 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 stainless steel pipe-ultra high performance concrete composite pole.
Fig. 2 is an enlarged sectional view a-a of the prestressed stainless steel pipe-ultra high performance concrete composite pole shown in fig. 1.
Description of reference numerals: the steel pipe comprises a stainless steel pipe 100, a preformed hole 110, shear nails 120, an ultra-high performance 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 M-grade prestressed stainless steel pipe-ultrahigh performance concrete composite electric pole with the slight diameter of 190mm and the length (L) of 12M comprises a stainless steel pipe 100 and an ultrahigh performance concrete layer 200 poured on the inner wall of the stainless steel pipe 100, wherein the thickness t1 of the stainless steel pipe 100 is 0.5mm, and the thickness t2 of the ultrahigh performance concrete layer 200 is 20 mm.
The stainless steel pipe 100 is composed of two half pipes split along the axis, two rows of preformed holes 110 with the aperture of 14mm are reserved in the stainless steel pipe 100 along the length direction, the row spacing between the preformed holes 110 is 200mm, stainless steel nuts 210 with the inner diameter of 14mm and the length of 20mm are welded on the inner wall of the stainless steel pipe corresponding to the preformed holes 110, the nuts 210 which are pre-buried in the ultra-high performance concrete layer 200 in the embodiment are used for fixing the ladder stand, and the ladder stand is connected with the nuts 210 which are reserved in the ultra-high performance concrete layer 200 through connecting pieces, such as bolts, penetrating through the preformed 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 stainless steel pipe 100 and the ultra-high performance concrete layer 200, rows of shear nails 120 are arranged on the inner wall of the stainless 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 stainless steel pipe 100 by welding or the like.
The ultra-high performance concrete layer 200 comprises the following components in parts by weight: 40-70 parts of cement, 25-45 parts of admixture, 80-120 parts of fine aggregate, 8-22 parts of steel fiber and 1.8-3.6 parts of polycarboxylic acid water reducing agent. Be equipped with prestressing steel skeleton 220 in the ultra high performance 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 stainless steel 100 inner walls is 10mm, or is greater than the reinforcing bar diameter.
The preparation method of the prestressed stainless steel pipe-ultrahigh-performance concrete composite electric pole comprises the following steps:
s1, preparing an electric pole mould, respectively placing two half pipes of a stainless steel pipe in an upper mould and a lower mould of the electric pole mould, closing the moulds to fix a designed prestressed reinforcement framework in the stainless steel pipe, closing an upper mould of the electric pole mould, screwing screws, and assembling the mould for later use;
s2, calculating the using amount of each raw material for manufacturing the ultra-high performance concrete layer according to the proportion, putting all fine aggregate and steel fiber into a stirrer to be stirred for 60-120 seconds, then putting all cement and admixture into the stirrer to be stirred for 180-240 seconds, and finally putting all water reducing agent and water into the stirrer to be stirred for 360-600 seconds to obtain the ultra-high performance concrete mixture with slump of 160-240 mm;
s3, pouring the ultra-high performance concrete mixture obtained in the step S2 into a stainless steel pipe assembled in an electric pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite electric 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 130 MPa, and the bending strength is not lower than 14 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 M-grade prestressed stainless steel pipe-ultrahigh performance concrete composite electric pole with the slight diameter of 190mm and the length (L) of 12M comprises a stainless steel pipe 100 and an ultrahigh performance concrete layer 200 poured on the inner wall of the stainless steel pipe 100, wherein the thickness t1 of the stainless steel pipe 100 is 1.5mm, and the thickness t2 of the ultrahigh performance concrete layer 200 is 80 mm.
The stainless steel pipe 100 is composed of two half pipes split along the axis, two rows of preformed holes 110 with the aperture of 20mm are reserved in the stainless steel pipe 100 along the length direction, the row spacing between the preformed holes 110 is 300mm, stainless steel nuts 210 with the inner diameter of 20mm and the length of 80mm are welded on the inner wall of the stainless steel pipe corresponding to the preformed holes 110, the nuts 210 which are pre-buried in the ultra-high performance concrete layer 200 in the embodiment are used for fixing the ladder stand, and the ladder stand is connected with the nuts 210 which are reserved in the ultra-high performance concrete layer 200 through connecting pieces, such as bolts, penetrating through the preformed 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 stainless steel pipe 100 and the ultra-high performance concrete layer 200, rows of shear nails 120 are arranged on the inner wall of the stainless 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 stainless steel pipe 100 by welding or the like.
The ultra-high performance concrete layer 200 comprises the following components in parts by weight: 40-70 parts of cement, 25-45 parts of admixture, 80-120 parts of fine aggregate, 8-22 parts of steel fiber and 1.8-3.6 parts of polycarboxylic acid water reducing agent. Be equipped with prestressing steel skeleton 220 in the ultra high performance 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 stainless steel 100 inner walls is 12mm, or is greater than the reinforcing bar diameter.
The preparation method of the prestressed stainless steel pipe-ultrahigh-performance concrete composite electric pole comprises the following steps:
s1, preparing an electric pole mould, respectively placing two half pipes of a stainless steel pipe in an upper mould and a lower mould of the electric pole mould, closing the moulds to fix a designed prestressed reinforcement framework in the stainless steel pipe, closing an upper mould of the electric pole mould, screwing screws, and assembling the mould for later use;
s2, calculating the using amount of each raw material for manufacturing the ultra-high performance concrete layer according to the proportion, putting all fine aggregate and steel fiber into a stirrer to be stirred for 60-120 seconds, then putting all cement and admixture into the stirrer to be stirred for 180-240 seconds, and finally putting all water reducing agent and water into the stirrer to be stirred for 360-600 seconds to obtain the ultra-high performance concrete mixture with slump of 160-240 mm;
s3, pouring the ultra-high performance concrete mixture obtained in the step S2 into a stainless steel pipe assembled in an electric pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite electric 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 130 MPa, and the bending strength is not lower than 14 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 stainless steel pipe-ultrahigh performance concrete composite electric pole with the slight diameter of 190mm and the length (L) of 10m comprises a stainless steel pipe 100 and an ultrahigh performance concrete layer 200 poured on the inner wall of the stainless steel pipe 100, wherein the thickness t1 of the stainless steel pipe 100 is 1.0mm, and the thickness t2 of the ultrahigh performance concrete layer 200 is 50 mm.
The stainless steel pipe 100 is composed of two half pipes split along the axis, two rows of preformed holes 110 with the aperture of 17mm are reserved in the stainless steel pipe 100 along the length direction, the row spacing between the preformed holes 110 is 250mm, stainless steel nuts 210 with the inner diameter of 17mm and the length of 50mm are welded on the inner wall of the stainless steel pipe corresponding to the preformed holes 110, the nuts 210 which are pre-buried in the ultra-high performance concrete layer 200 are used for fixing the ladder stand, and the ladder stand is connected with the nuts 210 which are reserved in the ultra-high performance concrete layer 200 through connecting pieces, such as bolts, penetrating through the preformed 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 stainless steel pipe 100 and the ultra-high performance concrete layer 200, rows of shear nails 120 are arranged on the inner wall of the stainless 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 stainless steel pipe 100 by welding or the like.
The ultra-high performance concrete layer 200 comprises the following components in parts by weight: 40-70 parts of cement, 25-45 parts of admixture, 80-120 parts of fine aggregate, 8-22 parts of steel fiber and 1.8-3.6 parts of polycarboxylic acid water reducing agent. Be equipped with prestressing steel skeleton 220 in the ultra high performance 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 stainless steel 100 inner walls is 11mm, or is greater than the reinforcing bar diameter.
The preparation method of the prestressed stainless steel pipe-ultrahigh-performance concrete composite electric pole comprises the following steps:
s1, preparing an electric pole mould, respectively placing two half pipes of a stainless steel pipe in an upper mould and a lower mould of the electric pole mould, closing the moulds to fix a designed prestressed reinforcement framework in the stainless steel pipe, closing an upper mould of the electric pole mould, screwing screws, and assembling the mould for later use;
s2, calculating the using amount of each raw material for manufacturing the ultra-high performance concrete layer according to the proportion, putting all fine aggregate and steel fiber into a stirrer to be stirred for 60-120 seconds, then putting all cement and admixture into the stirrer to be stirred for 180-240 seconds, and finally putting all water reducing agent and water into the stirrer to be stirred for 360-600 seconds to obtain the ultra-high performance concrete mixture with slump of 160-240 mm;
s3, pouring the ultra-high performance concrete mixture obtained in the step S2 into a stainless steel pipe assembled in an electric pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite electric 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 130 MPa, and the bending strength is not lower than 14 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
An M-grade prestressed ultrahigh-performance concrete pole with a slight diameter of 190mm and a length of 12M and a preparation method thereof are the same as those in example 1 except that a stainless steel pipe is not arranged.
Comparative example 2
An M-grade prestressed concrete pole with a slight diameter of 190mm and a length of 12M and a preparation method thereof are the same as those in the embodiment 1 except that a stainless steel pipe is not arranged, and the ultrahigh-performance concrete is changed into C50 concrete.
Comparative example 3
An M-grade prestressed ultrahigh-performance concrete pole with a slight diameter of 190mm and a length of 12M and a preparation method thereof are the same as those in the embodiment 1 except that no shear nails are arranged on the inner wall of a stainless steel pipe.
The performance test of the M-grade prestressed electric poles with the slight diameter of 190mm and the length of 12M prepared in the examples 1 to 3 and the comparative examples 1 to 3 is carried out according to GB4623-2014 annular concrete poles, and the test results are shown in Table 1.
TABLE 1 mechanical property test results of M-level prestressed electric pole with a small diameter of 190mm and a length of 12M
| Numbering | Bearing capacityBending moment (more than or equal to 117kN.m) | Crack width (less than or equal to 1.5mm) | Deflection deformation (less than or equal to 1000mm) |
| Example 1 | 132.8 | Is free of | 400 |
| Example 2 | 138.7 | Is free of | 389 |
| Example 3 | 144.6 | Is free of | 375 |
| Comparative example 1 | 81.9 | 1.78 | 850 |
| Comparative example 2 | 58.5 | 1.69 | 495 |
| Comparative example 3 | 109.5 | Is free of | 1035 |
From table 1, comparative example 1 has no stainless 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 has no stainless steel pipe, the ultra-high performance concrete is changed into C50 concrete, compared with example 1, the bearing capacity bending moment is reduced more, the crack width is increased more, and the deflection deformation is reduced slightly; comparative example 3 the stainless steel pipe has no shear nails on the inner wall, and compared with example 1, the bearing force 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 stainless steel pipe is combined with the ultra-high performance 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 of the stainless steel and the ultra-high performance 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 stainless steel pipe-ultrahigh-performance concrete composite electric pole is characterized by comprising a stainless steel pipe and an ultrahigh-performance concrete layer poured on the inner wall of the stainless steel pipe, wherein the stainless steel pipe is composed of two half pipes split along the axis, and a prestressed reinforcement framework is planted in the ultrahigh-performance concrete layer.
2. The prestressed stainless steel pipe-ultra-high performance concrete composite electric pole as recited in claim 1, wherein rows of shear nails are provided on the inner wall of the stainless steel pipe.
3. The prestressed stainless steel pipe-ultra-high performance concrete composite electric pole as claimed 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 stainless steel pipe-ultra-high performance concrete composite electric pole as claimed in any one of claims 1 to 3, wherein the thickness of the stainless steel pipe is 0.5 to 1.5 mm.
5. The prestressed stainless steel pipe-ultra-high performance concrete composite electric pole as claimed in any one of claims 1 to 3, wherein rows of prepared holes are prepared in the stainless steel pipe along the length direction, and nuts are welded to the inner wall of the stainless steel pipe corresponding to the prepared holes.
6. The prestressed stainless steel pipe-ultra-high performance concrete composite electric pole as claimed 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 20-80 mm.
7. The prestressed stainless steel pipe-ultra-high performance concrete composite electric pole as claimed in any one of claims 1 to 3, wherein the thickness of the ultra-high performance concrete layer is 20 to 80 mm; or the distance between the prestressed reinforcement framework and the inner wall of the stainless steel pipe is 10-12 mm or more than the diameter of the reinforcement forming the prestressed reinforcement framework.
8. The prestressed stainless steel pipe-ultrahigh-performance concrete composite electric pole as claimed in any one of claims 1 to 3, wherein the ultrahigh-performance concrete layer comprises the following components in parts by weight: 40-70 parts of cement, 25-45 parts of admixture, 80-120 parts of fine aggregate, 8-22 parts of steel fiber and 1.8-3.6 parts of polycarboxylic acid water reducing agent.
9. The preparation method of the prestressed stainless steel pipe-ultra-high performance 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, respectively placing two half pipes of a stainless steel pipe in an upper mould and a lower mould of the electric pole mould, closing the moulds to fix a prestressed reinforcement framework in the stainless steel pipe, and assembling the moulds for later use;
s2, putting all fine aggregates and steel fibers for manufacturing the ultra-high performance concrete layer into a stirrer according to the proportion, stirring for 60-120 seconds, then putting all cement and admixtures into the stirrer, stirring for 180-240 seconds, and finally putting all water reducing agents and water into the stirrer, and stirring for 360-600 seconds to obtain the ultra-high performance concrete mixture;
s3, pouring the ultra-high performance concrete mixture obtained in the step S2 into a stainless steel pipe assembled in an electric pole mold in the step S1, tensioning reinforcing steel bars, and then carrying out centrifugal molding to obtain the composite electric 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 stainless steel pipe-ultra-high performance concrete composite electric pole as recited in claim 9,
and (3) the slump of the ultra-high performance concrete mixture in the step S2 is 160-240 mm, and/or the compressive strength is not lower than 130 MPa and the bending strength is not lower than 14 MPa after steam curing in the step S4.
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| Country | Link |
|---|---|
| CN (1) | CN112248213A (en) |
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2020
- 2020-09-24 CN CN202011017577.5A patent/CN112248213A/en not_active Withdrawn
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Application publication date: 20210122 |
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| WW01 | Invention patent application withdrawn after publication |