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Cast-in-place pile for enhancing bearing strength of deep miscellaneous fill area and construction method

A technology of bearing strength and miscellaneous filling, applied in sheet pile walls, foundation structure engineering, protection devices, etc., can solve problems such as accelerated corrosion efficiency, engineering safety hazards, and reduced bearing strength of cast-in-place piles, so as to reduce porosity and reduce Potential safety hazards, good synergistic effects

Active Publication Date: 2020-12-04
湖北中南岩土工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the cast-in-place piles buried in the miscellaneous fill area have been in a relatively humid environment for a long time, it is easy to accelerate the corrosion efficiency of chloride ions or sulfates on the steel cages in the cast-in-place piles, resulting in a reduction in the bearing strength of the cast-in-place piles, which makes the project relatively large. Security risks

Method used

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  • Cast-in-place pile for enhancing bearing strength of deep miscellaneous fill area and construction method
  • Cast-in-place pile for enhancing bearing strength of deep miscellaneous fill area and construction method
  • Cast-in-place pile for enhancing bearing strength of deep miscellaneous fill area and construction method

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0053] The components and proportions of the expansion agent in Preparation Examples 1-3 are shown in Table 2 below.

preparation example 1

[0057] A kind of expansion agent, its preparation method is as follows:

[0058] Step 1, prepare calcium oxide, calcium carbonate and silicon micropowder according to the proportioning in table 2 and evenly mix to obtain premixture;

[0059] Step 2, after the pre-mixture is sent into the ball mill and milled at a ball milling speed of 650rad / min for 2h, the ball milling speed of the ball mill is increased to 800rad / min, and ball milling is continued for 30min to obtain an intermediate mixture;

[0060] Step 3, drying and crushing the intermediate mixture to obtain an expanding agent with a particle size of ≤100 μm.

preparation example 2

[0062] A kind of expansion agent, and the difference of preparation example 1 is:

[0063] Step 2: Send the pre-mixture into a ball mill and mill at a ball milling speed of 550 rad / min for 2.5 hours, then increase the ball milling speed to 850 rad / min, and continue ball milling for 25 minutes to obtain an intermediate mixture.

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Abstract

The invention discloses a cast-in-place pile for enhancing the bearing strength of a deep miscellaneous fill area and a construction method, and relates to the technical field of cast-in-place piles,the cast-in-place pile for enhancing the bearing strength of the deep miscellaneous fill area is prepared from the following raw materials in parts by weight: 355-365 parts of cement, 150-160 parts offly ash, 1240-1250 parts of gravel, 620-625 parts of river sand, 12-16 parts of an expanding agent, 6-8 parts of a stabilizing agent; 4.2-4.8 parts of a water reducing agent, and 175-185 parts of water; wherein the expanding agent comprises calcium oxide, calcium carbonate and silica powder, and the weight ratio of the calcium oxide to the calcium carbonate to the silica powder is (24-26): (12-13): (6-6.5). The cast-in-place pile has the effects of good chloride ion resistance and good sulfate resistance.

Description

technical field [0001] The invention relates to the technical field of cast-in-place piles, in particular to cast-in-place piles and a construction method for strengthening the bearing strength of deep and thick miscellaneous fill areas. Background technique [0002] With the continuous advancement of my country's infrastructure construction, many spoil sites in roads, railways and industrial and civil buildings are inevitably used as construction sites. A considerable part of this kind of site has deep miscellaneous fill soil stratum. Due to the complex source and composition of miscellaneous fill soil, it has the characteristics of uneven properties and poor stability, so miscellaneous fill soil generally cannot be directly used as the foundation of buildings. The cast-in-situ pile foundation is used to directly penetrate the miscellaneous fill soil layer. [0003] Since the cast-in-place piles buried in the miscellaneous fill area have been in a relatively humid environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04E02D5/34E02D7/00E02D15/04E02D31/06C04B111/70
CPCC04B28/04C04B40/0042C04B2111/2015C04B2111/70E02D5/34E02D7/00E02D15/04E02D31/06C04B18/08C04B14/02C04B14/068C04B24/10C04B24/287C04B2103/302C04B22/002C04B22/064C04B22/10C04B14/064
Inventor 赵鹏飞尹磊周国安王泽希周涛方成全朱宏詹秉章睿陈洪明
Owner 湖北中南岩土工程有限公司
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