Method for supporting and protecting row pile pit

A foundation pit support and pile foundation technology, applied in the field of foundation foundation, can solve the problems of large displacement of pile top, small excavation depth of foundation pit, and easy overturning of excavation depth, etc., so as to increase overturning resistance , The effect of reducing the amount of reinforcement in the pile body and increasing the excavation depth

Inactive Publication Date: 2009-04-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current row of pile support structures all use vertical piles. The common problem when using vertical row of piles for foundation pit support is that the top of the pile is prone to large displacement, resulting in large deformation of the ground outside the foundation pit behind the pile. It endangers the surrounding environment; when the strength of the pile is not enough, it is easy to cause the slope protection pile to break and make the foundation pit unstable; the excavable depth of the foundation pit is small, and it is easy to overturn when the excavation depth increases

Method used

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  • Method for supporting and protecting row pile pit
  • Method for supporting and protecting row pile pit
  • Method for supporting and protecting row pile pit

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The foundation pit project of a dormitory building is 65.0m long, 15.0m wide, and the excavation depth is 5.120m. The geotechnical engineering investigation report shows that the range from the ground to the buried depth of 2m is miscellaneous fill, and the range from the buried depth of 2m to 12m is powder earth. There are no important buildings around the construction site of the foundation pit project. The support structure adopts cantilever support of inclined piles with an inclination of 10°. The support piles are 11m long, 800mm in pile diameter, and 100mm in pile distance. Drainage wells are used for dewatering in the pit, and the open cut method is used for construction. The four right angles of the foundation pit are sloped at a slope angle of 45°.

Embodiment 2

[0034] The foundation pit project of a subway station is 190.0m long, 20.7m wide, and 14.070m deep. The two sides of the long side adopt inclined row piles and bolt support structure, and the two ends are blocked in advance by underground diaphragm walls.

[0035] The vertical distribution of strata within the excavation depth range of the foundation pit from top to bottom is: fill soil, thickness 2.70-4.50m; ②silt, thickness 8.10-13.00m; ③coarse gravel sand, thickness 1.0-8.0m; ④silty Clay, thickness 0.18-2.80m; ⑤ residual sandy cohesive soil, thickness 1.40-13.10m; ⑥ fully weathered granite, thickness 0.85-7.85m; ⑦-1 sandy strongly weathered granite, thickness 0.40-14.50m; ⑦-2 Fragmented strongly weathered granite, with a thickness of 1.0-3.9m; ⑧medium weathered granite, with a thickness of 1.10-12.20m; ⑨slightly weathered granite.

[0036] The support structure adopts inclined row of piles and bolt support. The inclination of the row of piles is 10°. The length of the supp...

Embodiment 3

[0039] A circular foundation pit with a diameter of 126 meters and a depth of 12.650 meters is supported by inclined row piles and back pressure soil. The ground elevation of the foundation pit site is 2.143 meters above sea level, the range from the ground to the elevation -18 meters is miscellaneous fill and silt, the elevation -18 meters to the elevation -27 meters is silty clay, and the soil quality is good. Tube wells are arranged in the foundation pit for dewatering and dewatering.

[0040] The support structure of the foundation pit adopts cantilever support of inclined row of piles. The inclination angle of the row of piles is 1°. The length of the supporting piles is 26m, the diameter of the piles is 800mm, and the distance between the centers of the pile bottoms is 850mm.

[0041] Back pressure soil is reserved at the bottom of the pit. The height of the back pressure soil is 3.5 meters. Sprayed concrete facing.

[0042] The basic principle of the invention is: the s...

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Abstract

The invention discloses a supporting method of a pile foundation pit, the pile is the single-row pile inclining to the outside of the foundation pit, and the method comprises the following steps: (a) according to site conditions and computational analysis, the angle of inclination of the pile, the pile length and the pile body strength, the foundation pit supporting structure, and the excavation progression of the foundation pit are determined; (b) the piles are constructed; (c) the foundation pit supporting structure is constructed; (d) the foundation pit is excavated; and (e) clearing and leveling are carried out to the bottom of the foundation pit, and the construction work of the next step is carried out. The method can reduce the displacement of the pile bolck, reduce the bending moment of the pile body and lower construction cost to a large extent, also can increase excavation depth and reduce the possibility of the occurrence of overturning damage.

Description

technical field [0001] The invention relates to the field of foundation foundations, in particular to a method for supporting foundation pits by using row piles. Background technique [0002] The pile row support structure has many advantages such as simple construction technology, low cost, and flexible layout. It is one of the most widely used forms of foundation pit support at home and abroad. The support structure of row piles can be divided into three types: cantilever type, pull-anchor type and internal support type. When the excavation of the foundation pit is shallow, the geological conditions are good, and the deformation of the support structure and the control of ground settlement outside the pit are not high, the cantilever pile row support form can be used. Pile row support can also be combined with pit support or bolt anchorage to improve support capacity. In the soft soil area, when the excavation area of ​​the foundation pit is large, the deformation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D17/04E02D17/20
Inventor 郑刚杨建民程雪松邓旭
Owner TIANJIN UNIV
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