Method for construction of pipe sinking cast-in-place pile in pebble bed, gravel layer and sand layer

A technology of immersed tube grouting piles and pebble layers, which is applied in the direction of sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of low bearing capacity of single piles, large sediment, high engineering costs, etc., and achieve the effect of improving construction efficiency

Inactive Publication Date: 2012-05-09
刘清洁
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the continuous development of industrial and civil construction, different types of stratum soils are often encountered during construction, such as garden gravel layers, sand layers or cohesive soils with a standard penetration number of N63. The pebble layer, gravel layer, and sand layer of a certain thickness, in such soil layers, the bored pile technology is usually used, and the bored pile is prone to hole collapse, resulting in large sediment, low single pile bearing capacity, and cycle time. Long, high engineering cost
In order to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example one:

[0022] The overview of this embodiment is as follows: a certain project has 30 floors on the ground, a basement, and a foundation buried depth of 6.2m. The natural foundation scheme is not established. The building area is 38,000 square meters, and the design requires the characteristic value of the composite foundation bearing capacity to be greater than 580kpa. Under the original foundation soil ①The characteristic value of the bearing capacity of the layer of fine sand is 180kpa, the standard penetration number is 11-19, and the average thickness is 1.3m. ②The characteristic value of the bearing capacity of the layer of fine sand is 200kpa, and the standard penetration number is 18-25 shots, the average thickness is 5m, the characteristic value of the bearing capacity of the layer of fine sand is 250kpa, the standard penetration hits are 27-31 hits, and the thickness is greater than 20m.

[0023] The method of the present invention is used for construction...

Example Embodiment

[0031] Embodiment two:

[0032] The outline of this embodiment is: a certain project has 20 floors above the ground and 1 floor underground, frame-shear structure. The foundation is buried at a depth of 6.5 meters. The natural foundation scheme is not established. The original geological profile is a round gravel layer under the foundation ②, with a characteristic value of 200kpa of natural bearing capacity, an average thickness of 6m, and a standard penetration rate of 15-25 shots. The stratum is unevenly distributed, ③silty clay layer, with an average thickness of 7m. The characteristic value of the bearing capacity is 180kpa. ④Strongly weathered sandstone with a thickness greater than 2m. ⑤Medium weathered sandstone layer with an average thickness of 1.5m. The method of the present invention is used for construction. The design adopts reinforced concrete sunk pipe rammed and expanded cast-in-place piles. The pile diameter is 500mm and the pile length is 13 meters. The dia...

Example Embodiment

[0042] Embodiment three:

[0043] The overview of this embodiment is: a certain project has 18 floors on the ground, a basement, a foundation buried depth of 6m, and a building area of ​​3,500 square meters. The design requirement is to use piles under the wall, the pile diameter is 450mm, the pile length is 10m, the main reinforcement of the steel cage is 6 pieces, the diameter is 14mm, and the vertical ultimate bearing capacity of a single pile is greater than 3000KN. The original foundation soil is a fine sand layer. The characteristic value of the fine sand bearing capacity of the first layer under the foundation is 180kpa, the standard penetration number is 11-15 strokes, and the average thickness is 4m. The characteristic value of the bearing capacity of the second layer fine sand is 220kpa, the standard penetration The number of shots is 18-27, and the average thickness is 5m. The characteristic value of the bearing capacity of the layer of coarse sand is 250kpa, the numbe...

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Abstract

A method for the construction of a pipe sinking cast-in-place pile in a pebble bed, a gravel layer and a sand layer, wherein firstly, a hole is drilled in a pile position and mud or coal ash slurry is simultaneously injected into the hole; and then the construction of the pipe sinking cast-in-place pile is performed through a process of hammering double sleeves; therefore, the purposes of no sediment at the bottom end of the pile and high bearing capacity of single pile are achieved. The method has the characteristics of high construction speed, no pollution on the spot, ensured quality, low construction cost, and ensured designed pile diameter and pile length.

Description

technical field [0001] The invention relates to a construction method of an immersed tube grouting pile, in particular to a method for constructing an immersed tube grouting pile in a relatively dense pebble layer, a gravel layer and a sand layer. Background technique [0002] With the continuous development of industrial and civil construction, different types of stratum soils are often encountered during construction, such as garden gravel layers, sand layers or cohesive soils with a standard penetration number of N63. The pebble layer, gravel layer, and sand layer of a certain thickness, in such soil layers, the bored pile technology is usually used, and the bored pile is prone to hole collapse, resulting in large sediment, low single pile bearing capacity, and cycle time. Long, high engineering costs. In order to solve the above-mentioned problems, the applicant Liu Qingjie filed an application for an invention patent titled "Construction Method of Immersed Pipe Cast-in...

Claims

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Application Information

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IPC IPC(8): E02D5/38E02D5/44
Inventor 刘清洁
Owner 刘清洁
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