Prestress concrete tubular pile free of steaming and pressing

A concrete pipe pile and prestressing technology, which is applied in the field of building materials, can solve problems such as the adverse effects of pipe pile durability, long energy consumption time, and pipe pile cracks, and achieve optimized raw material particle gradation, good filling performance, and increased The effect of the concrete layer

Active Publication Date: 2015-12-09
河南双建科技发展股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of engineering construction technology and the continuous updating of foundation treatment engineering construction technology and mechanical equipment, high-strength concrete prestressed static pressure pipe piles have been widely used in foundation treatment of high-rise building projects in large and medium-sized cities; The second steam curing method (the initial steam curing ensures demoulding, and the second high-pressure steam curing ensures concrete strength). Autoclaving curing is the most time-consuming and energy-consuming process. Generally speaking, taking an oil-fired boiler as an example, each steam pressure is 1 cubic meter. The fuel consumption of rice concrete is 25Kg, and the energy consumption time is relatively long; in addition, autoclave curing requires an autoclave, and the investment is relatively high, and the temperature of the pipe pile is relatively high when it comes out of the autoclave. Durability has a detrimental effect

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] An autoclaved prestressed concrete pipe pile, the pipe pile concrete is composed of cementitious material, sand, gravel, water reducer and water, wherein each cubic meter of concrete contains 420-480kg of cementitious material, and the water-binder ratio is 0.24- 0.26, the sand rate is 30-33%; the crushed stone is broken pebbles, the particle size is 5-25mm, of which 1300-1500kg per cubic meter of concrete; the dosage of water reducer is 1-2% of the cementitious material; The material is composed of cement, slag powder, carbide slag, micro-silica powder and gypsum powder; the mass ratio of slag powder in the cementitious material is 20-30%, carbide slag is 5-7%, micro-silica powder is 5-10%, gypsum Powder 5-7%, the balance is cement.

[0020] The crushing index of broken pebbles is 7-7.5%, the needle flake content is less than 3%, the mud content is not more than 0.5%, does not contain mud, and the apparent density is 2500-2700Kg / m 3 , the bulk density is 1400-1500Kg / m...

Embodiment 2

[0029] An autoclaved prestressed concrete pipe pile, the pipe pile concrete is composed of cementitious material, sand, gravel, water reducer and water, wherein each cubic meter of concrete contains 440kg of cementitious material, and the water-binder ratio is 0.25, The sand rate is 32%; the gravel is crushed pebbles with a particle size of 5-25mm, of which 1300kg is contained in each cubic meter of concrete; the amount of water reducer is 2% of the cementitious material; the cementitious material is composed of cement, slag powder, calcium carbide Slag, silica fume and gypsum powder; the mass ratio of slag micropowder in the cementitious material is 25%, carbide slag is 6%, microsilica fume is 8%, gypsum powder is 6%, and the balance is cement.

[0030] The crushing index of the broken pebbles is 7-7.5%, the needle flake content is less than 3%, the mud content is not more than 0.5%, the mud content is 0%, and the apparent density is 2500-2700Kg / m 3 , the bulk density is 1400...

Embodiment 3

[0040]An autoclaved prestressed concrete pipe pile, the pipe pile concrete is composed of cementitious material, sand, gravel, water reducer and water, wherein each cubic meter of concrete contains 430kg of cementitious material, and the water-binder ratio is 0.24, The sand rate is 30%; the crushed stone is crushed cobblestone, which contains 1350kg per cubic meter of concrete; the amount of water reducing agent is 1.5% of the cementitious material; Powder composition; the mass ratio of slag powder in the cementitious material is 20%, carbide slag is 7%, silica fume is 6%, gypsum powder is 5%, and the balance is cement.

[0041] The preparation method of the described autoclaved-free prestressed concrete pipe pile comprises the following steps:

[0042] 1) Concrete mixing, feeding into the mould, closing the mould, tensioning;

[0043] 2) Centrifugal forming: The centrifugal process is 80 rpm at low speed, 2 minutes; 200 rpm at low and medium speed, 1.5 minutes; 280 rpm at me...

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Abstract

Provided is a prestress concrete tubular pile free of steaming and pressing. Each cubic meter of concrete contains 420-480 kg of gel materials, the water-binder ratio is 0.24-0.26, and the sand ratio is 30-33%. Crushed stone is broken cobblestone, and each cubic meter of concrete contains 1250-1350 kg of the cobblestone. Doped water reducers account for 1.5%-2.0% of the gel materials. The gel materials are prepared from, by mass, 20-30% of superfine slag powder, 5-7% of carbide slag, 5-10% of micro silicon powder, 5-7% of gypsum powder and the balance cement. The comprehensive performance of the tubular pile is fully improved while the quality of the PHC tubular pile is guaranteed; meanwhile, the technology process is simplified, steam consumption in the pile making process is reduced; use of hoisting equipment required when the pile enters and gets out of an autoclave is reduced, and electric energy consumption is correspondingly reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an autoclave-free prestressed concrete pipe pile. Background technique [0002] With the rapid development of engineering construction technology and the continuous updating of foundation treatment engineering construction technology and mechanical equipment, high-strength concrete prestressed static pressure pipe piles have been widely used in foundation treatment of high-rise building projects in large and medium-sized cities; The second steam curing method (the initial steam curing ensures demoulding, and the second high-pressure steam curing ensures concrete strength). Autoclaving curing is the most time-consuming and energy-consuming process. Generally speaking, taking an oil-fired boiler as an example, each steam pressure is 1 cubic meter. The fuel consumption of rice concrete is 25Kg, and the energy consumption time is relatively long; in addition, a...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/06
Inventor 郭立鹏赵东升张建国卢明涛张毅张浩程焕然王虎李展旭
Owner 河南双建科技发展股份有限公司
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