Ultrahigh-strength concrete pole and manufacturing method thereof

Abstract

The invention belongs to the field of power transmission equipment, and particularly relates to an ultrahigh-strength concrete pole and a manufacturing method thereof. The ultra-high performance concrete used for the electric pole is formed by combining cement, silica fume, fly ash, quartz sand, water and a water reducing agent according to a certain proportion. A steel reinforcement framework used by the electric pole is composed of longitudinal load-bearing steel bars, spiral bars of dovetail joint structures, stirrups within the full-length range of the electric pole and steel balls arranged at the contact positions of the stirrups and the longitudinal load-bearing steel bars. The manufacturing method comprises the following steps: firstly, binding steel bars to prepare a basic steel bar framework, then, preparing concrete, then, loading a concrete mixture into a test film, carrying out centrifugal forming on the electric pole, and finally, curing the formed ultrahigh-strength concrete electric pole. The ultra-high performance concrete and the reinforcement cage structure improve the compressive strength and the crack resistance of the concrete pole. And the manufacturing method is simple, the material supply is stable, the production cost is low, the manufactured high-strength concrete electric pole is good in quality and long in service life, and a reliable and economical scheme is provided for power transmission.

Description

Technical Field

[0001] The invention belongs to the field of power transmission equipment, and specifically relates to an ultra-high-strength concrete pole and a manufacturing method thereof. Background Art

[0002] Electric poles play a key role in the field of power transmission and distribution. As one of the basic infrastructures of the power system, they are widely used. However, traditional wooden poles have many problems, such as insufficient strength, susceptibility to corrosion, and limited bearing capacity. These problems not only increase maintenance costs, but also pose a threat to the reliability and security of the power grid. At the same time, due to the limitations of materials and construction processes, traditional concrete poles cannot fully meet the various needs of power transmission and distribution, especially under extreme environmental conditions, such as high temperature, high humidity, and high altitude areas, their performance is even more unsatisfactory.

[0003] In order to overcome the problems of traditional poles and improve the reliability and safety of the power grid, people began to explore new ultra-high-strength concrete poles. Ultra-high-strength concrete poles have excellent strength and durability, and can withstand greater loads and harsher environmental conditions, thereby improving the stability and reliability of the power grid. However, there are some problems with existing materials and manufacturing methods, such as unstable material supply, complex manufacturing process, and high production costs. These problems limit the large-scale production and application of ultra-high-strength concrete poles. Therefore, it is necessary to study and propose a manufacturing method that can ensure stable material supply, simplify the manufacturing process, and reduce production costs, thereby promoting the further development and widespread application of ultra-high-strength concrete poles. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to make substantial improvements and innovations to the prior art and to provide an ultra-high-strength concrete pole with high strength, long service life and low cost.

[0005] Another object of the present invention is to provide a method for manufacturing an ultra-high-strength concrete pole.

[0006] The technical solution adopted to achieve the purpose of the present invention is a super high strength concrete pole, which includes a super high strength concrete pole matrix. The super high strength concrete pole matrix includes components and weight parts of cement, silica fume, fly ash, quartz sand, water, and water reducer, and is characterized by: 100-120 parts of cement, 11-15 parts of silica fume, 10-20 parts of fly ash, 140-155 parts of quartz sand, 17-20 parts of water, and 2-4 parts of water reducer.

[0007] Further, wherein the cement is ordinary Portland cement of grade P·O52.5;

[0008] Furthermore, the SiO2 content of the silica ash is 92%-93%, and the fly ash is Grade I fly ash;

[0009] Furthermore, the maximum particle size of the quartz sand does not exceed 5 mm, and the fineness modulus is 2.4;

[0010] Furthermore, the water reducing agent adopts a polycarboxylic acid high performance water reducing agent.

[0011] The technical solution adopted to achieve another purpose of the present invention is a method for manufacturing an ultra-high-strength concrete pole, which is characterized in that longitudinal stress-bearing steel bars, spiral bars and stirrups are built into the ultra-high-strength concrete pole matrix.

[0012] The production of ultra-high-strength concrete poles is carried out in the following steps:

[0013] Step S1: tying steel bars to prepare a basic steel bar skeleton;

[0014] Step S2: preparation of concrete;

[0015] Step S3: loading the concrete mixture into the test film and centrifugally forming the pole;

[0016] Step S4 is to maintain the formed ultra-high-strength concrete poles.

[0017] Furthermore, the longitudinal stress-bearing steel bars shall be evenly arranged along the pole ring direction, and shall not be less than 6;

[0018] Furthermore, spiral reinforcements shall be arranged on the outside of the longitudinal force-bearing steel bars. The spiral reinforcements shall adopt a dovetail structure. The spacing between the spiral reinforcements shall not be greater than 60mm within 1.5m from both ends of the steel bars, and shall not be greater than 120mm at other locations.

[0019] Furthermore, stirrups should be arranged throughout the entire length of the pole, with a spacing of 1.5m between them, and steel balls should be arranged at the point where the stirrups contact the longitudinal force-bearing steel bars;

[0020] Furthermore, the centrifugation of the pole in step S3 is divided into three stages, namely slow, medium and fast. The slow speed is 80-120 r / min, the time is between 1.5-3 min, the medium speed is 300-400 r / min, the time is between 2-3 min, the fast speed is 400-450 r / min, the time is between 6-10 min, and the total centrifugation time shall not be less than 12 min.

[0021] The ultra-high-strength concrete pole and the manufacturing method thereof of the present invention have the following beneficial effects:

[0022] 1. The present invention not only reduces the cost but also greatly improves the strength, durability and anti-seepage performance of the concrete pole by adding silica fume and fly ash to the raw materials for preparing the concrete pole, and is very suitable for complex situations under harsh environmental conditions.

[0023] 2. The present invention significantly improves the overall performance and stability of the concrete pole by arranging spiral bars and stirrups of dovetail structure on the longitudinal force-bearing steel bars. Through the design of the dovetail structure, the steel skeleton forms a firm interlocking connection, effectively enhancing the overall rigidity and shear resistance of the steel skeleton.

[0024] 3. The present invention optimizes the centrifugal process by arranging steel balls on the stirrups of the concrete pole, so that the friction during the centrifugal process of the concrete pole is reduced and the pressure is evenly transmitted. The density and strength of the concrete pole are significantly improved, and the quality and performance of the concrete pole are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the manufacturing method of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0027] Example 1

[0028] An ultra-high-strength concrete pole is composed of an ultra-high-strength concrete pole matrix and a steel frame, wherein the raw materials of the ultra-high-strength concrete pole matrix include, by mass, 100 parts of cement, 11 parts of silica fume, 17 parts of fly ash, 148 parts of quartz sand, 19 parts of water, and 2 parts of water reducing agent.

[0029] The specific preparation steps are:

[0030] Step 1: Tie the steel bars to prepare the basic steel skeleton. The longitudinal stress-bearing steel bars shall be evenly arranged along the pole ring, and shall not be less than 6; spiral bars shall be arranged on the outside of the longitudinal stress-bearing steel bars, and the spiral bars shall adopt a dovetail structure. The spacing between the spiral bars shall not be greater than 60mm within 1.5m from both ends of the steel bars, and shall not be greater than 120mm at other times; stirrups shall be arranged throughout the entire length of the pole, with a spacing of 1.5m between the stirrups, and steel balls shall be arranged at the contact between the stirrups and the longitudinal stress-bearing steel bars.

[0031] Step 2: Preparation of concrete pole matrix raw materials. Weigh the materials of each component according to the stated proportions and stir until each component is evenly dispersed.

[0032] Step 3: Put the concrete mixture into the test film and centrifuge the pole. The centrifugation of the pole is divided into three stages, namely slow, medium and fast. The slow speed is 80-120r / min, the time is between 1.5-3min, the medium speed is 300-400r / min, the time is between 2-3min, the fast speed is 400-450r / min, the time is between 6-10min, and the total centrifugal time shall not be less than 12min.

[0033] Step 4: Maintain the formed ultra-high-strength concrete poles.

[0034] Example 2

[0035] An ultra-high-strength concrete pole is composed of an ultra-high-strength concrete pole matrix and a steel frame, wherein the ultra-high-strength concrete pole matrix raw materials include, by mass: 115 parts of cement, 13 parts of silica fume, 20 parts of fly ash, 155 parts of quartz sand, 18 parts of water, and 4 parts of water reducing agent.

[0036] Example 3

[0037] An ultra-high-strength concrete pole is composed of an ultra-high-strength concrete pole matrix and a steel frame, wherein the raw materials of the ultra-high-strength concrete pole matrix include, by mass: 117 parts of cement, 15 parts of silica fume, 15 parts of fly ash, 152 parts of quartz sand, 17 parts of water, and 4 parts of water reducing agent.

[0038] Comparative Example 1

[0039] The raw materials of the concrete pole include, by weight, 100 parts of cement, 150 parts of quartz sand, 20 parts of water, and 2 parts of water reducing agent.

[0040] The preparation method is the common concrete pole preparation method.

[0041] The concrete poles prepared in the above embodiments and comparative examples were subjected to mechanical property tests and durability tests. In the mechanical property test, compressive strength tests and cracking load tests were conducted, including a 28-day compressive strength test and a cracking load test under a bending bearing capacity test. At the same time, a chloride ion penetration depth test was also conducted to evaluate its durability. The specific test results are as follows:

[0042]

[0043] As can be seen from the table above, ultra-high-strength concrete poles have better compression resistance, crack resistance and durability than ordinary concrete poles. The overall performance of concrete poles has been significantly improved by rationally mixing cement, silica fume, fly ash, quartz sand, water and water reducer, and skillfully configuring spiral reinforcement of dovetail structure on the outside of the longitudinal stress-bearing steel bars, setting stirrups throughout the entire length of the pole, and configuring steel balls at the contact between the stirrups and the longitudinal stress-bearing steel bars.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An ultra-high strength concrete pole, characterized in that: The concrete pole comprises an ultra-high-strength concrete pole matrix and a steel frame, wherein the ultra-high-strength concrete pole matrix comprises components and weight proportions of cement, silica fume, fly ash, quartz sand, water, and a water reducing agent.

2. The ultra-high strength concrete pole according to claim 1, characterized in that: 100-120 parts of cement, 11-15 parts of silica fume, 10-20 parts of fly ash, 140-155 parts of quartz sand, 17-20 parts of water, and 2-4 parts of water reducing agent.

3. The ultra-high strength concrete pole according to claim 1, characterized in that: The cement is ordinary Portland cement of grade P·O52.

5.

4. The ultra-high strength concrete pole according to claim 1, characterized in that: The SiO2 content of the silica ash is 92%-93%, and the fly ash is grade I fly ash.

5. The ultra-high strength concrete pole according to claim 1, characterized in that: The maximum particle size of the quartz sand does not exceed 5 mm, and the fineness modulus is 2.

4.

6. The ultra-high strength concrete pole according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid high performance water reducing agent.

7. A method for manufacturing an ultra-high strength concrete pole as claimed in claim 1, characterized in that: The specific preparation steps include: Step S1: tying steel bars to prepare a basic steel bar skeleton; Step S2: preparation of concrete; Step S3: loading the concrete mixture into the test film and centrifugally forming the pole; Step S4 is to maintain the formed ultra-high-strength concrete poles.

8. The method for manufacturing an ultra-high-strength concrete pole according to claim 7, characterized in that: The longitudinal force-bearing steel bars shall be evenly arranged along the circumference of the pole and shall not be less than 6.

9. The method for manufacturing an ultra-high-strength concrete pole according to claim 7, characterized in that: It is described that spiral reinforcement should be arranged on the outside of the longitudinal force-bearing steel bars. The spiral reinforcement adopts a dovetail structure. The spacing between the spiral reinforcements should not be greater than 60mm within 1.5m from both ends of the steel bars, and should not be greater than 120mm at other times.

10. The method for manufacturing an ultra-high-strength concrete pole according to claim 7, characterized in that: It is described that stirrups should be arranged throughout the entire length of the pole, with a stirrup spacing of 1.5m, and steel balls should be arranged at the contact points between the stirrups and the longitudinal force-bearing steel bars.

11. The method for manufacturing an ultra-high-strength concrete pole according to claim 7, characterized in that: The centrifugation of the pole in step S3 is divided into three stages, namely slow, medium and fast. The slow speed is 80-120r / min, the time is between 1.5-3min, the medium speed is 300-400r / min, the time is between 2-3min, the fast speed is 400-450r / min, the time is between 6-10min, and the total centrifugation time shall not be less than 12min.

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