Construction method for constructing filling pile with electric drill and rotary digging relay drill

A technology of cast-in-situ piles and electric drills, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of increasing the pulling load of rotary excavation pile bodies, unfavorable hole wall stability, and easy generation of negative pressure, etc., to reduce construction costs. Cost, good promotional value, effect of reducing usage

Inactive Publication Date: 2017-09-15
SHANGHAI BAOYE GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially in the filling soil and soft soil stratum, hole collapse and shrinkage are prone to occur; the contact surface between the drill barrel of the rotary pile machine and the soil is relat

Method used

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  • Construction method for constructing filling pile with electric drill and rotary digging relay drill
  • Construction method for constructing filling pile with electric drill and rotary digging relay drill

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Embodiment 1

[0058] Project overview: The first phase of the Sanyang Road wind tower supporting project of an urban rail transit line 7 is located at the junction of Sanyang Road and Zhongshan Avenue. It consists of a tower and a skirt building, with 3 floors underground and 46 floors above the ground. The podium has 7 floors above ground, and the building height is 216m. The design grade of the pile foundation of this project is Grade A. The foundation adopts bored pile (post-grouting) foundation, the designed pile type is Φ800mm and Φ900mm, and the bearing layer at the pile tip is (5-2) layers of medium cemented conglomerate or medium cemented sandstone as the bearing layer at the pile tip. The depth is ≥2m (the depth of the engineering piles in the podium area is ≥0.8m).

[0059] The summary table of pile foundation design parameters is as follows:

[0060]

[0061] Geological conditions: from top to bottom soil layers are:

[0062] 1) 1-2 plain fill: the age of accumulation varie...

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Abstract

The invention discloses a construction method of cast-in-situ piles constructed by electric drill and rotary drilling relay drill, which includes two stages of construction preparation and construction operation; the construction preparation stage includes: 1) construction technology preparation stage; 2) site preparation stage; 3), mud preparation and circulation stage; 4), construction machinery, raw material preparation. Using this construction method mainly improves the utilization rate of machinery, speeds up the speed of hole formation, and shortens the time of hole formation. Electric drill construction in soft soil layer is more economical than rotary excavation pile machine, and the speed is faster than rotary excavation. The depth of rock penetration is difficult to judge and other problems. According to the construction records of the pile test stage, the electric drill has a footage of about 30cm/hour in the 5-1 weakly cemented conglomerate layer, and the 5-2 medium cemented conglomerate layer has a footage of about 10cm/hour, and the speed of the rotary pile machine in the 5-1 weakly cemented conglomerate layer is about 100cm / hour, the speed of 5‑2 medium cemented conglomerate layer is about 50cm/hour, and the speed is greatly improved.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a method suitable for various types of poor soil quality such as miscellaneous fill soil, plain fill soil, muddy silty clay, silty clay, silt, silt sand, and silty fine sand in the upper soil layer. Soil layer, the lower soil layer is weakly cemented conglomerate, medium cemented conglomerate and other soft rocks and hard rocks, electric drill and rotary drilling relay drill The construction method of cast-in-place piles. Background technique [0002] With the continuous progress of science and technology, especially the rapid development of road transportation and the continuous acceleration of urbanization driven by the development of science and technology, high-rise buildings have sprung up like mushrooms after a spring rain. In construction, cast-in-place piles are more common A kind of construction. [0003] At present, cast-in-place piles are mainly divided into bore...

Claims

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Application Information

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IPC IPC(8): E02D5/38E02D13/08
CPCE02D5/385E02D13/08
Inventor 沈育龙杨统元丁恩亮王杰闫富华
Owner SHANGHAI BAOYE GRP CORP
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