A method for the preparation of pipe piles

Abstract

The invention provides a method for preparing a tubular pile, which comprises the following steps: mixing and stirring concrete raw materials to form pile body concrete, putting the stirred pile body concrete into a mold, performing prestress tension, and The pile body concrete after stretching is centrifuged until the pipe pile is formed, and the centrifugally formed prestressed concrete pipe pile is subjected to normal pressure steam curing, and then the mold is removed and naturally cured to obtain the pipe pile; the concrete raw materials include the following: Component: admixture; wherein the admixture is super-early-strength polycarboxylate superplasticizer, which accelerates the cement water and chemical reaction, and realizes the single-free process of low-temperature steam curing and normal pressure curing, that is, after removing the formwork in the conventional process high pressure maintenance. The method of the invention uses a small amount of steam, reduces the steam curing temperature, saves energy, and protects the environment; the PHC pipe pile produced by the method has stable strength, and the mean square error is smaller than that of the PHC pipe pile produced by a common process.

Description

technical field [0001] The invention relates to a method for preparing a pipe pile. Background technique [0002] At present, domestic manufacturers of pipe piles generally use two steam curings, normal pressure steam curing and high pressure steam curing, so that C80 pipe piles can reach the factory strength in a relatively short period of time (24 hours). Both the steaming pond and the autoclave consume a lot of steam. However, with the mandatory implementation of the new national environmental protection law, coal-fired boilers below 10 tons (inclusive) are facing environmental protection upgrades. If they want to meet environmental protection standards, they must choose natural gas. This will give everyone Pipe pile manufacturers have brought huge cost increases. According to statistics, the cost of fuel oil is 3.5-4.0 times that of coal, and the cost of gas is 4.5-5.5 times that of coal. Taking the conventional product D500-125 piles as an example, the cost per meter T...

AI Technical Summary

Problems solved by technology

Both the steaming pond and the autoclave consume a lot of steam. However, with the mandatory implementation of the new national environmental protection law, coal-fired boilers below 10 tons (inclusive) are facing environmental protection upgrades. If they want to meet environmental protection standards, they must choose natural gas. This will give everyone Pipe pile manufacturers have brought huge cost increases. According to statistics, the cost of fuel oil is 3.5-4.0 times that of coal, and the cost of gas is 4.5-5.5 times that of coal. Taking the conventional product D500-125 piles as an example, the cost per meter The cost of pipe piles will increase by about 15-20 yuan, so the "boiler crisis" in the pipe pile industry will become a problem that all pipe pile manufacturers must face. subject

Atmospheric pressure steam curing is carried out at a temperature lower than 100 degrees, including static stop, heating, constant temperature, and cooling process; while autoclaved curing needs to be under the conditions of pressure 0.95-1.00MPa and temperature 170-180, Curing for 10-20 hours. Autoclave curing is the most energy-consuming and time-consuming process in the entire pipe pile production process. Not only does it need to add autoclave equipment, but it also requires high energy consumption, high maintenance costs, and dangers such as boiler explosions.

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