Construction method for increasing dry auger boring pouring pile bearing capacity

A technology of auger drilling and construction method, which is applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of large diameter of cast-in-situ piles, reduce frictional resistance, increase project cost, etc., and achieve the improvement of single pile bearing capacity, Improvement of pile end bearing capacity and reduction of engineering cost

Inactive Publication Date: 2008-03-26
李树源
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Problems solved by technology

In order to increase the bearing capacity of a single pile and make the pile length above the groundwater level, a construction technique of tamping and expanding piles has appeared. However, this construction method has large vibration and high noise, which not only causes noise pollution to residents, but also causes damage to surrounding buildings on the construction site. damage, so it cannot meet the construction requirements in the urban area
In order to solve the problem of pile formation through the groundwater layer, construction techniques such as drilling and grouting pile formation, jet grouting bottom expansion method, and steel casing retaining wall pouring method have appeared one after another. These methods have a long construction period and a large amount of cement. High project cost, not economical enough
The invention patent with the patent number of 97119826.8 provides a construction technology of rotary drilling mud retaining cast-in-place pile. This construction technology

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  • Construction method for increasing dry auger boring pouring pile bearing capacity

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[0009] The construction method to improve the bearing capacity of dry screw bored piles is to design the pile length above the groundwater level, use the screw drill to dry drill to the design depth, and use a rammer to compact the virtual soil that falls on the bottom of the hole; close to the pile hole Two grouting pipes 3 are symmetrically fixed on the side wall of 1 using U-shaped cards 4. The grouting pipe 3 is made of a 20mm diameter PVC plastic pipe, which is connected to the grouting pipe at the height of the lower 1 / 3 of the pile hole On the one-way valve 5, the lower end of the grouting pipe 3 is bent toward the center of the pile hole and is in contact with the bottom of the hole. The side of the grouting pipe 3 that is 10cm below the one-way valve 5 in contact with the wall of the pile hole is processed with 6 grout holes 6 with a diameter of 4mm, 6-8 grout holes 6 with a diameter of 5mm are processed on the side where the lower part of the grouting pipe 3 is in contac...

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Abstract

The construction process of raising the bearing capacity of auger boring pile includes setting two grouting pipes symmetrically beside the side wall of pile hole, setting reinforcing cage and grouting concrete with concrete pumping agent in 1-1.5 wt% of cement, and pressure grouting cement slurry with concrete pumping agent in 1 wt% of cement and concrete expanding agent in 5 wt% of cement in the pumping pressure of 200-300 kg/sq cm in 8-24 hr after filing until cement slurry overflows from the top end beside the pile. The process can raise the bearing capacity of the pile by over 1 time, reduce the length of the pile, save material, lower cost and reduce construction pollution.

Description

technical field [0001] The invention relates to a construction method of pile foundation engineering, in particular to a construction method for improving the bearing capacity of dry auger bored piles. Background technique [0002] At present, most high-rise buildings use bored pile foundations in order to meet the design bearing capacity and settlement requirements. Dry auger bored pile construction is an economical and environmentally friendly pile foundation construction technology, but it is only suitable for construction above the groundwater level, so the pile length can only be designed above the groundwater level. In recent years, with the continuous improvement of the design height of buildings, the requirements for the bearing capacity of pile foundations have also become higher and higher, and the construction technology of dry auger bored piles has been greatly restricted. In areas where the groundwater level rises, it is almost Be eliminated. In order to incre...

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Application Information

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IPC IPC(8): E02D5/34E02D5/62
Inventor 李树源高同王传家
Owner 李树源
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