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

A foundation treatment and composite foundation technology, applied in construction, sheet pile wall, foundation structure engineering, etc., to achieve the effect of improving combined stiffness, wide application range, economical and reasonable

Inactive Publication Date: 2006-10-25
饶之帆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the end of the last century, our country developed cored mixing piles, which were used in pilot applications in Yunnan, Jiangsu, Tianjin and other places. The general pile diameter is 500mm, the cement soil pile is less than 16 meters long, and the core pile is a square wedge of 220mm×220mm, which 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] Buildings A and B of a commercial plaza, the standard value of the bottom surface axial force of the side column foundation N=1980kN, the construction party uses the pile foundation φ500 long 18m prestressed concrete pipe pile, calculated according to the geological data of the No. 2 test pile, the characteristic value of the single pile bearing capacity R a =628kN, the static load test is 483kN, the design uses 500kN, 4 pile caps, pile spacing 4d=2m, cap 3×3=9 square meters. The comprehensive unit price of pipe piles is 168 yuan / m, and each pile is 3024 yuan; A and B pick a total of 333 piles, with a total price of 1.007 million yuan.

[0057]

[0058] Note: The frictional resistance and end resistance of the upper composite pile are taken from the pipe pile value.

[0059] Long-core concrete cement-soil composite pile scheme 1: φ600 combined pile + φ300 pipe pile core pile

[0060] The steps of building foundation treatment method are:

[0061] (1) Pile foundati...

Embodiment 2

[0076] The maximum column load of a hot spring resort near Dianchi Lake in Kunming is about 8000kN. The geotechnical engineering survey report proposes the use of pile foundations, 400mm×400mm square piles, and the pile length is 42m. It is estimated that the characteristic value of the single pile bearing capacity is 1200kN~1400kN, and the borehole is drilled at 2040. Calculated as 1355kN. Each pile 8736+450 (bag sand well) = 9186 yuan.

[0077]

Soil layer name

Soil thickness

(m)

Characteristic value of bearing capacity

f ak

(kPa)

Tumo around prefabricated pile

Resistance characteristic value

q s (kPa)

Soil bearing capacity of precast pile end

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

...

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PUM

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Abstract

The invention is a concrete long-core cement combined pile building groundsill processing method, selecting load bearing value of a single pile according to the minimal value of the four bearable resistances of: 1. cement intensity damage; 2. groundsill soil intensity damage; 3. pile body combination intensity damage; and 4. upper-stage groundsill soil and core pile combination intensity damage, and selecting synthetically pile distance according 2.5 times combined pile diameter and >=4 times core pile diameter, where the combined pile diameter is 400mm-850mm and the combined pile length is 3m-25m and the extended length of the core pile is 2m-45m. And it merges concrete pile, cement blended pile, long- short pile processes into an organic whole, giving full play to their advantages, and having advantages of high bearing value, low sediment, simple and convenient device, reliable quality, etc, and especially applied to thick and soft soil groundsill processing.

Description

Technical field [0001] The invention belongs to a construction foundation treatment method, in particular to a construction foundation treatment method of a concrete long core cement-soil composite pile. Background technique [0002] In the foundation engineering of multi-high-rise buildings and structures, the foundation treatment method of composite foundation or pile foundation is generally used to improve the engineering characteristics of soft soil to meet the requirements of bearing capacity and settlement required by the design. Weak soil foundations include: soft clay, fill soil, silt, organic soil, peat soil, saturated silt, etc., which are widely distributed in coastal and inland rivers and lake areas in my country. Kunming Dianchi Lake and Dali Erhai Lake are well-known weak soil areas in my country. The soft soil foundation treatment technology is closely related to project safety, progress and investment, and is a key technology in project construction. Cement-soil m...

Claims

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Application Information

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IPC IPC(8): E02D27/16E02D5/50
Inventor 穆晓多饶智颖饶之帆饶英伟
Owner 饶之帆
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