A method for manufacturing a utility pole and the utility pole itself.

Abstract

This invention relates to the field of utility pole technology, specifically a method for manufacturing a utility pole. The method includes a pole body, which is a hollow structure in the shape of a frustum or cylinder. The pole body comprises an internal reinforcing cage and concrete poured outside the reinforcing cage. The reinforcing cage is woven from multiple straight longitudinal bars and transversely wound reinforcing bars. The concrete comprises the following materials in parts by weight: cement, sand, gravel, slag powder, iron oxide powder, zinc sulfate (50-70 parts), 200-mesh iron powder, sodium aluminate, water, and a water-reducing agent. For 3-5 hours after pouring, the pole body is under negative pressure, which gradually decreases thereafter. This method results in a utility pole with higher strength, where the reinforcing cage does not separate from the concrete over long-term use, and is durable. This invention also relates to a utility pole.

Description

Technical Field

[0001] This invention relates to the field of utility pole technology, and more specifically, to a method for manufacturing utility poles and utility poles. Background Technology

[0002] A utility pole, including a pole body, the pole body including an internal steel cage and concrete poured outside the steel cage, the pole body being a hollow structure in the shape of a frustum or cylinder, the steel cage being woven from multiple straight longitudinal bars and transversely wound bars. Patent document CN107162499A, entitled "A High-Strength Self-Compacting Concrete and Its Preparation Method," discloses a high-strength self-compacting concrete. The raw materials for this high-strength self-compacting concrete include: cement, glass microspheres, silica fume, shale ceramsite, clay ceramsite, ceramsite sand, cenospheres, river sand, water-reducing agent, shrinkage-reducing agent, stabilizer, and water. While this method can produce concrete of a certain strength, it cannot meet the higher strength requirements for utility poles. In addition, during the construction of utility poles, the reinforcing cage is placed in a mold, and concrete is poured into the mold. After the utility pole is cast, it needs to be cured, that is, the surface is kept in a certain state of moisture. Generally, this is done by sprinkling water at regular intervals at room temperature. However, since utility poles are exposed to the sun and rain for a long time and are standing upright, poorly cured utility poles often experience separation of the reinforcing cage and concrete, reducing their service life. Therefore, traditional curing methods are not suitable for the maintenance of utility poles and need to be improved. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned shortcomings by providing a method for manufacturing a utility pole with higher strength and a utility pole that is less prone to separation of concrete and reinforcing steel during use.

[0004] The technical solution of the manufacturing method of the utility pole of the present invention is as follows: A method for manufacturing a utility pole includes a pole body, wherein the pole body is a hollow structure in the shape of a frustum or cylinder, the pole body includes an internal steel cage and concrete poured outside the steel cage, the steel cage is woven from multiple straight longitudinal bars and transversely wrapped reinforcing bars, and the concrete includes the following materials in parts by weight: 300-400 parts cement, 450-550 parts sand, 700-800 parts gravel, 30-50 parts slag powder, 50-70 parts iron oxide powder, 50-70 parts zinc sulfate, 100-120 parts 200 mesh iron powder, 30-50 parts sodium aluminate, 150-200 parts water, and 10-20 parts water-reducing agent.

[0005] Furthermore, during the period from the completion of pouring to 3-5 hours after the completion of pouring, the pole body is under negative pressure. Then, the negative pressure gradually decreases, and during the period from the completion of pouring to 36-48 hours after the completion of pouring, the pole body is under normal pressure.

[0006] Furthermore, during the period from the completion of pouring to 1-3 hours after pouring, the temperature of the pole body is maintained within the range of 35-40°C; this stage is the high-temperature stage. After the high-temperature stage, the pole body is then kept at a low temperature, which is the temperature of the pole body maintained within the range of 18-22°C.

[0007] Furthermore, within 24 to 100 hours after the pouring is completed, a curing liquid is sprayed onto the surface of the pole body at intervals to keep the pole body moist. The curing liquid is a mixture of 6-8 parts by weight of tetraethyl orthosilicate, 3-5 parts by weight of polyacrylic acid, and 35-40 parts by weight of water.

[0008] Furthermore, during the period from the completion of pouring to 3-5 hours after completion, the tensile force on the longitudinal reinforcement is 600-800 kg, and then gradually decreases over time; 24-36 hours after completion of pouring, the tensile force on the longitudinal reinforcement is 400-600 kg; then gradually decreases; and 72-100 hours after completion of pouring, the tensile force on the longitudinal reinforcement is 100-0 kg.

[0009] The beneficial effects of this invention are: the manufacturing method of such utility poles has the advantages of higher strength, the steel cage not separating from the concrete after long-term use, and durability. Detailed Implementation

[0010] The present invention will be further described below with reference to the embodiments.

[0011] A method for manufacturing a utility pole includes a pole body, wherein the pole body is a hollow structure in the shape of a frustum or cylinder, the pole body includes an internal steel cage and concrete poured outside the steel cage, the steel cage is woven from multiple straight longitudinal bars and transversely wrapped reinforcing bars, and the concrete is a mixture of concrete raw materials.

[0012] Example 1 The first utility pole was made using traditional methods.

[0013] The first utility pole was constructed using concrete raw materials in a ratio of cement, sand, gravel, and water of 45:50:130:18, and reinforced with a steel cage.

[0014] Example 2 The concrete raw materials include the following: 300 kg of cement, 450 kg of sand, 700 kg of gravel, 30 kg of slag powder, 50 kg of iron oxide powder, 50 kg of zinc sulfate, 100 kg of 200-mesh iron powder, 30 kg of sodium aluminate, 150 kg of water, and 10 kg of water-reducing agent.

[0015] We obtained the second utility pole.

[0016] Example 3 The concrete raw materials include the following: 400 kg of cement, 550 kg of sand, 800 kg of gravel, 50 kg of slag powder, 70 kg of iron oxide powder, 70 kg of zinc sulfate, 120 kg of 200-mesh iron powder, 50 kg of sodium aluminate, 200 kg of water, and 20 parts of water-reducing agent.

[0017] We obtained the third utility pole.

[0018] Example 4 The concrete raw materials include the following: 350 kg of cement, 500 kg of sand, 750 kg of gravel, 40 kg of slag powder, 60 kg of iron oxide powder, 60 kg of zinc sulfate, 110 kg of 200-mesh iron powder, 40 kg of sodium aluminate, 170 kg of water, and 15 parts of water-reducing agent.

[0019] The fourth utility pole was obtained.

[0020] The strength of the second, third, and fourth utility poles was found to be better than that of the first pole, generally increasing by 20-30%.

[0021] Example 5 Based on the above embodiments 2-4, the maintenance method involves placing the cast-in-place utility pole in an environment with normal pressure to obtain the fifth utility pole.

[0022] Example 6 Based on embodiments 2-4 above, the maintenance is carried out in the following manner: During the period from the completion of pouring to 3-5 hours after pouring, the pole body is under negative pressure, resulting in the sixth utility pole. For example, the negative pressure is 0.5 atmospheres.

[0023] Comparing the fifth utility pole with the resulting sixth utility pole, the strength of the sixth utility pole is generally increased by 10%.

[0024] Example 7 Based on embodiments 2-4 above, the maintenance is carried out in the following manner: During the period from the completion of pouring to 3-5 hours after completion, the pole body is under negative pressure, resulting in the 7th pole. For example, the negative pressure is 0.3 atmospheres.

[0025] Comparing the second, third, and fourth utility poles with the resulting seventh utility pole, the strength of the seventh utility pole is generally increased by 12%.

[0026] In conclusion, during maintenance, the greater the negative pressure, the higher the strength of the resulting utility pole.

[0027] Example 8 Based on the above embodiments 2-4, the maintenance method is to place the completed utility pole outdoors for maintenance, resulting in the eighth utility pole.

[0028] Example 9 Based on the above embodiments 2-4, the maintenance of the pole is carried out as follows: during the period from the completion of pouring to 1-3 hours after the completion of pouring, the temperature of the pole body is maintained in the temperature range of 35-40°C; this stage is the high temperature stage. After the high temperature stage, the pole body is also kept in the low temperature stage, which is: the temperature of the pole body is maintained in the temperature range of 18-22°C; thus, the ninth pole is obtained.

[0029] Comparing the eighth utility pole with the resulting ninth utility pole, the strength of the ninth utility pole is generally increased by 5-7%.

[0030] In conclusion, the above-mentioned technical solutions resulted in higher strength utility poles during maintenance.

[0031] Example 10 Based on the above embodiments 2-4, during the period of 24 to 100 hours after the pouring is completed, a curing liquid is sprayed onto the surface of the pole body at intervals to keep the pole body moist. The curing liquid is a mixture of 6-8 parts by weight of tetraethyl orthosilicate, 3-5 parts by weight of polyacrylic acid and 35-40 parts by weight of water.

[0032] Comparing the eighth utility pole with the resulting tenth utility pole, the strength of the tenth utility pole is generally increased by 6-8%.

[0033] In conclusion, the above-mentioned technical solutions resulted in higher strength utility poles during maintenance.

[0034] Example 11 Based on the above embodiments 2-4, after the casting is completed, the longitudinal reinforcement is in a free state, resulting in the eleventh utility pole.

[0035] Example 12 Based on embodiments 2-4 above, the tensile force on the longitudinal reinforcement is 600-800 kg during the period from the completion of pouring to 3-5 hours after completion, and then gradually decreases over time; 24-36 hours after completion of pouring, the tensile force on the longitudinal reinforcement is 400-600 kg; then the tensile force gradually decreases; 72-100 hours after completion of pouring, the tensile force on the longitudinal reinforcement is 100-0 kg. The twelfth utility pole is thus obtained.

[0036] Comparing the eleventh utility pole with the obtained twelfth utility pole, the steel bars inside the twelfth pole are less likely to separate from the concrete during long-term use.

[0037] In conclusion, adopting the above-mentioned technical solutions during maintenance helps to prevent the internal steel bars from separating from the concrete during long-term use.

Claims

1. A method for manufacturing a utility pole, comprising a pole body, wherein the pole body is a hollow structure in the shape of a frustum or cylinder, the reinforcing cage is woven from multiple straight longitudinal bars and transversely wound bars, the pole body includes an internal reinforcing cage and concrete poured outside the reinforcing cage, the concrete comprising the following materials in parts by weight: 300-400 parts cement, 450-550 parts sand, 700-800 parts gravel, 30-50 parts slag powder, 50-70 parts iron oxide powder, 50-70 parts zinc sulfate, 100-120 parts 200-mesh iron powder, 30-50 parts sodium aluminate, 150-200 parts water, and 10-20 parts water-reducing agent.

2. The method for manufacturing a utility pole according to claim 1, characterized in that: During the period from the completion of pouring to 3-5 hours after the pouring is completed, the pole body is under negative pressure.

3. The method for manufacturing a utility pole according to claim 1 or 2, characterized in that: in During the period from the completion of pouring to 1-3 hours after pouring, the temperature of the pole body is maintained within the temperature range of 35-40°C. This stage is the high-temperature stage. After the high-temperature stage, the pole body is then kept at a low temperature, which is the temperature range of 18-22°C.

4. The method for manufacturing a utility pole according to claim 1 or 2, characterized in that: in During the period of 24 to 100 hours after the pouring is completed, a curing liquid is sprayed onto the surface of the pole body at intervals to keep the pole body moist. The curing liquid is a mixture of 6-8 parts by weight of tetraethyl orthosilicate, 3-5 parts by weight of polyacrylic acid and 35-40 parts by weight of water.

5. The method for manufacturing a utility pole according to claim 1 or 2, characterized in that: in During the period from the completion of pouring to 3-5 hours after completion, the tensile force on the longitudinal reinforcement is 600-800 kg, and then the tensile force gradually decreases over time; 24-36 hours after completion of pouring, the tensile force on the longitudinal reinforcement is 400-600 kg; then the tensile force gradually decreases; 72-100 hours after completion of pouring, the tensile force on the longitudinal reinforcement is 100-0 kg.

6. A utility pole obtained using any one of the methods described in claims 1-5.