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Concrete long-core cement-soil composite pile building foundation treating method

A foundation treatment and composite foundation technology, which is applied in construction, sheet pile walls, foundation structure engineering, etc., to achieve the effects of wide application range, strong ability to coordinate deformation, and reduce project cost

Inactive Publication Date: 2009-07-01
饶之帆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] my country developed short-core mixing piles at the end of the last century and applied them on a trial basis in Yunnan, Jiangsu, Tianjin and other places. The general pile diameter is 500mm, the cement-soil mixing pile is less than 16 meters long, and the core pile is a square wedge of 220mm×220mm. Long, can only be used for shallow foundation treatment of multi-storey buildings

Method used

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  • Concrete long-core cement-soil composite pile building foundation treating method
  • Concrete long-core cement-soil composite pile building foundation treating method
  • Concrete long-core cement-soil composite pile building foundation treating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In buildings A and B of a commercial plaza, the standard value of the axial force on the bottom surface of the side column foundation is N=1980kN. The builder uses a φ500 18m long prestressed concrete pipe pile for the pile foundation. Calculated according to the geological data of the No. 2 test pile, the characteristic value of the bearing capacity of the single pile is R a =628kN, the static load test is 483kN, the design adopts 500kN, 4 pile caps, the pile distance is 4d=2m, and the caps are 3×3=9 square meters. The comprehensive unit price of pipe piles is 168 yuan / m, and each pile is 3,024 yuan; A and B selected a total of 333 piles, with a total price of 1.007 million yuan.

[0057] geological data

[0058]

[0059] Note: The frictional resistance and end resistance of the upper segment of the composite pile are taken from the value of the pipe pile.

[0060] Concrete long-core cement-soil composite pile scheme 1: φ600 mixing pile + φ300 tube pile core...

Embodiment 2

[0078] The maximum column load of a hot spring resort near Dianchi Lake in Kunming is about 8000kN. The geotechnical engineering investigation report proposes to use pile foundations, 400mm×400mm square piles, and the pile length is 42m. The estimated characteristic value of the single pile bearing capacity is 1200kN~1400kN. Calculated to be 1355kN. Each pile 8736+450 (bag sand well) = 9186 yuan.

[0079] Geological data of 2040 borehole (fill above foundation bottom surface not listed)

[0080]

Soil layer name

Soil thickness

(m) Characteristic value of bearing capacity

f ak

(kPa) Prefabricated pile Zhou Tumo

resistance eigenvalue

q s (kPa) Prefabricated pile end soil bearing

force eigenvalue

q p (kPa) 2 1 silt 3.3 55 13 2 2 Silt 3.6 85 19 4 1 silt 5.8 60 15 4 2 Silt 1.5 120 23 4 3 silt 9.8+13.4 80 18 200 4 4 1 clay 2.9 130 22.5 450 4 4 silt 1.7+2....

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Abstract

The utility model relates to a method for treating building foundations of concrete long-core cement-soil composite piles. The invention belongs to a construction foundation treatment method, in particular to a construction foundation treatment method of concrete long-core cement-soil composite piles. The single pile bearing capacity of the present invention is selected according to the minimum value of four kinds of bearable resistances of 1. cement-soil strength failure, 2. foundation soil strength failure, 3. pile body combination strength failure and 4. upper section foundation soil and core pile combination strength failure; pile distance According to the comprehensive selection of 2.5 times the diameter of the stirring pile and ≥ 4 times the diameter of the core pile; the pile diameter of the upper section of the composite pile is 400mm-850mm, and the pile length is 3m-25m; the extended length of the core pile is 2m-45m. The invention integrates concrete piles, cement-soil mixing piles, and long-short piles into an organic combination of mutual penetration technologies, giving full play to their respective advantages, and has the advantages of high bearing capacity, small settlement, simple equipment, quality assurance, no-squeeze soil benefits, good construction environment, and remarkable It has the advantages of low cost and wide application, especially suitable for foundation treatment in thick and weak soil areas.

Description

technical field [0001] The invention belongs to a construction foundation treatment method, in particular to a construction foundation treatment method of concrete long-core cement-soil composite piles. Background technique [0002] Composite foundations or pile foundations are generally used in the foundation engineering of multi-story buildings and structures to improve the engineering properties of soft soils to meet the bearing capacity and settlement requirements required by the design. Weak soil foundations include: soft clay, filling soil, silt, organic soil, peat soil, saturated silt and fine sand, etc., which are widely distributed in my country's coastal areas and inland river banks and lake areas. Kunming Dianchi Lake and Dali Erhai Lake are famous soft soil areas in my country. Soft soil foundation treatment technology is closely related to project safety, progress and investment, and is a key technology in project construction. Common composite foundation soft f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/50E02D5/20
Inventor 穆晓多饶智颖饶之帆饶英伟
Owner 饶之帆
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