Preparation method of prestress high-strength concrete (PHC) tubular pile

A high-strength concrete and prestressed technology, applied in the direction of strengthening molding, can solve the problems of prolonged production process, difficult concrete pipe pile strength, increased carbon dioxide emissions, etc., to save energy consumption, shorten maintenance time, and reduce emissions. Effect

Inactive Publication Date: 2011-05-18
YUNNAN HUIBAO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing pre-tensioned prestressed high-strength concrete pipe piles (referred to as PHC pipe piles) use a relatively large amount of water for concrete preparation, so it is difficult to greatly increase the strength of concrete pipe piles.

Method used

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  • Preparation method of prestress high-strength concrete (PHC) tubular pile
  • Preparation method of prestress high-strength concrete (PHC) tubular pile

Examples

Experimental program
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Effect test

Embodiment 1

[0014] 1) First prepare the cementitious material: mix 20% by weight of the above-mentioned global superfine fly ash into 80% by weight of high-grade Portland cement (or ordinary Portland cement) above grade 42.5 to obtain gelling material.

[0015] 2) To produce AB-type prestressed high-strength concrete pipe piles with an outer diameter of 400 mm and a wall thickness of 90 mm: combine 410 kg of cementitious material (calculated per cubic meter) with 780 kg of sand, 1,270 kg of crushed stone, and Nai series or carboxylate commonly used on the market. Acid high-efficiency water reducer (Kao Nai series high-efficiency water reducer with a solid content of 40% by weight) 11 kg and 90 kg of water are fully stirred in a forced mixer for 240 seconds to obtain a mixture, and then the mixture is fed into the In the lower half mold of the pipe pile steel mold where the prestressed steel bar is placed, close the upper half mold of the pipe pile steel mold and then stretch the prestress...

Embodiment 2

[0017] 1) First prepare the cementitious material: mix 22% by weight of the above-mentioned global superfine fly ash into 78% by weight of high-grade Portland cement (or ordinary Portland cement) above grade 42.5 to obtain gelling material.

[0018] 2) To produce AB-type prestressed high-strength concrete pipe piles with an outer diameter of 400 mm and a wall thickness of 90 mm: combine 410 kg of cementitious material (calculated per cubic meter) with 790 kg of sand, 1,300 kg of crushed stone, Nai series or carboxylate commonly used on the market Acid high-efficiency superplasticizer (Kao Nai high-efficiency superplasticizer with a solid content of 40% by weight) 10 kg and 91 kg of water are fully stirred in a forced mixer for 200 seconds to obtain a mixture, and then the mixture is fed into the In the lower half mold of the pipe pile steel mold where the prestressed steel bar is placed, close the upper half mold of the pipe pile steel mold and then stretch the prestressed ste...

Embodiment 3

[0020] 1) Prepare the cementitious material first: mix the above-mentioned global superfine fly ash 8% by weight with 92% by weight of high-grade Portland cement (or ordinary Portland cement) above grade 42.5 and mix to obtain gelling material.

[0021] 2) To produce AB-type prestressed high-strength concrete pipe piles with an outer diameter of 400 mm and a wall thickness of 90 mm: combine 410 kg of cementitious material (calculated per cubic meter) with 780 kg of sand, 1,270 kg of crushed stone, and Nai series or carboxylate commonly used on the market. Acid high-efficiency water reducer (Kao Nai series high-efficiency water reducer with a solid content of 40% by weight) 11 kg and 93 kg of water are fully stirred in a forced mixer for 180 seconds to obtain a mixture, and then the mixture is fed into the In the lower half mold of the pipe pile steel mold where the prestressed steel bar is placed, close the upper half mold of the pipe pile steel mold and then stretch the prest...

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Abstract

The invention discloses a preparation method of a prestress high-strength concrete (PHC) tubular pile, which comprises the steps of: mixing 8-22 percent by weight of all-spherical superfine fly ash into 78-92 percent by weight of over 42.5 grade high-grade portland cement or common portland cement to form a gel material; and fully stirring the gel material with sand, macadam, naphthalene series superplasticizer or carboxylic acid superplasticizer and water in a forced stirring machine together for 180-240s to obtain a mixture, then feeding the mixture into a lower half die of a tubular pile steel die loaded with prestressed steel, connecting an upper half die of the tubular pile steel die and tensioning the prestressed steel, placing the steel die in a centrifugal machine for centrifuging, then carrying out normal pressure steam curing for 4-5h at a temperature of 70-90 DEG C, cooling and demoulding and then statically curing for 1-3 days to obtain the prestress high-strength concrete tubular pile with compression strength exceeding C80. The density of the concrete is greatly improved, the durability is improved, and the early and later-stage compression strengths of the concrete are greatly enhanced.

Description

technical field [0001] The invention relates to the technical field of concrete products, in particular to a preparation method of a prestressed high-strength concrete pipe pile (PHC). Background technique [0002] The existing pre-tensioned prestressed high-strength concrete pipe piles (referred to as PHC pipe piles) use a relatively large amount of water for concrete preparation, so it is difficult to greatly increase the strength of concrete pipe piles. If it is necessary to obtain a strength of C80 or above, secondary High-pressure steam curing process, which will result in longer production process, increased production cost, increased energy consumption, and increased carbon dioxide emissions. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a prestressed high-strength concrete pipe pile (PHC). [0004] The technical scheme of the invention is: using the global...

Claims

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Application Information

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IPC IPC(8): B28B21/68
Inventor 李谊华
Owner YUNNAN HUIBAO SCI & TECH
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