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Expansive concrete caisson pile and manufacturing method thereof, and concrete expanding agent

A technology of expansive concrete and expansion agent, which is applied in the direction of sheet pile walls, buildings, and foundation structure engineering. The bearing capacity of a single pile, the effect of increasing pile tip resistance and increasing pile side resistance

Active Publication Date: 2012-07-25
BEIJING ZHONGYANYI ENG TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Due to the large volume of cast-in-situ piles, the concrete in the pile holes is closer to the condition of moisture-absolute curing. The expansion cement or expansion agent used in the above-mentioned disclosed technology belongs to the ettringite type expansion agent. When the amount of such expansion agent is large, It will significantly reduce the strength of concrete, and the expansion rate is small when the dosage is small, and its expansion effect will be further reduced under the condition of absolute humidity, so the actual expansion is low, so the increase in the bearing capacity of the single pile of cast-in-place piles is small
In addition, these technologies all use expansive concrete for the pile body, and the addition of a large amount of expansion agent will also increase the cost of cast-in-place piles. This is also a factor that restricts the promotion of expansive concrete cast-in-place pile technology, so it is necessary to improve the above technologies

Method used

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  • Expansive concrete caisson pile and manufacturing method thereof, and concrete expanding agent
  • Expansive concrete caisson pile and manufacturing method thereof, and concrete expanding agent
  • Expansive concrete caisson pile and manufacturing method thereof, and concrete expanding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the manufacture of I type pile

[0027] see figure 1 As shown, in the cast-in-situ pile hole 3 where the reinforcement cage is installed below the ground, ordinary concrete and expanded concrete configured according to the strength grade required by the design are poured in sequence to form bamboo-shaped ordinary concrete section 1 and expanded concrete section 2, and each section The height of the concrete is not less than 1m; the pouring heights of ordinary concrete and expansive concrete can be the same or different, and ordinary concrete is preferred at the top of the pile. Wherein, the expansive concrete is formed by adding 15 to 30 wt% of an expansive agent to ordinary concrete, and the expansive agent can be a commercially available UEA expansive agent, but the expansive agent of the present invention is preferably used.

[0028] After the cast-in-situ piles are poured, it will be the test pile age. Refer to the current national industry standard ...

Embodiment 2

[0029] Embodiment 2: the manufacture of type II pile

[0030] see figure 2As shown, in the cast-in-situ pile hole 3 where the reinforcement cage is installed below the ground, the ordinary concrete 1 and the expanded concrete 2 configured according to the strength level required by the design are poured sequentially to form a bamboo joint in which the ordinary concrete section 1 and the expanded concrete section 2 are staggered. The height of each section of concrete is not less than 1m, and the pouring height of ordinary concrete and expansive concrete can be the same or different; 12 hours after the pile is poured, use a mud pump to pass The grout pipe 4 is pressure injected into the soft soil at the pile end and mixed with 5wt% (the expansion agent of the present invention can be added to the grouting liquid at the pile end with 5% to 10% of the expansion agent), or 12wt% cement of commercially available UEA expansion agent After 24 hours, the cement is solidified to form...

Embodiment 3

[0033] Example 3: Fabrication of Type III piles

[0034] see image 3 As shown, a Type III pile formation is shown. In the cast-in-situ pile hole 3 where the reinforcement cage is installed below the ground, all the expanded concrete is poured to form a pile body of a single material; In soft soil, add 5wt% of the expansion agent of the present invention (5% to 10% of the expansion agent can be added to the grouting liquid of the expansion agent of the present invention at the pile end), or cement slurry of 12wt% of the commercially available UEA expansion agent After 24 hours, the cement is solidified to form a solidified body 5 at the pile end. In pile casting, the expansive concrete is formed by adding 15-30wt% expansion agent to ordinary concrete. The expansion agent can be a commercially available UEA expansion agent, but the expansion agent of the present invention is preferably used.

[0035] Refer to the current national industry standard "Technical Specifications f...

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PUM

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Abstract

The invention provides an expansive concrete caisson pile and a manufacturing method thereof, and a concrete expanding agent, and belongs to the technical field of engineering materials and construction of concrete pile foundation. The method comprises the following steps of: alternatively pouring common concrete and expansive concrete into a caisson pile hole sequentially so as to form bamboo joint type I-shaped pile; and pouring slurry at the pile end of the I-shaped pile or the expansive concrete pile so as to form a II-shaped pile or a III-shaped pile. The expanding agent is manufactured by pulverizing 40 to 80 percent of limestone and 20 to 60 percent of gypsum, calcining the powder in a rotary kiln at the high temperature of 1,300 to 1,500 DEG C, and pulverizing 20 to 80 weight percent of the calcined substance and 20 to 80 weight percent of calcium sulfoaluminate cement or alunite or calcium aluminate cement or a mixture of the calcium sulfoaluminate cement, the alunite and thecalcium aluminate cement until the specific surface area is 150 to 400 square meters per kilogram. By the method, the manufacturing cost of the expansive concrete caisson pile can be reduced obviously; and compared with the common expansive concrete caisson pile, the expansive concrete caisson pile has the advantage of obviously increasing the bearing capacity of a single caisson pile.

Description

technical field [0001] The invention belongs to the technical field of concrete pile foundation engineering materials and construction, and relates to concrete pouring piles, concrete expansion agents and their manufacturing methods and uses. Background technique [0002] Concrete pouring pile is a structural measure often used in industrial and civil construction and foundation construction to improve the bearing capacity of the foundation. It is widely used in high-rise buildings, bridges and some areas with poor ground endurance. Adopting technical measures to improve the bearing capacity of a single pile is an important research content in the technical field of cast-in-situ piles. There have been many achievements in this regard, such as expanding the pile head (drilling the bottom), expanding the pile body (support plate) , Pile tip (side) post grouting technology, etc. These technologies can improve the bearing capacity of single piles of cast-in-place piles, but the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/34E02D5/48C04B22/14
Inventor 赵顺增刘立
Owner BEIJING ZHONGYANYI ENG TECH DEV CENT
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