Construction method for precast pile composite foundation, applied to elimination of loess collapsibility

A construction method and composite foundation technology, applied in foundation structure engineering, sheet pile walls, drilling with vibration, etc., can solve problems affecting construction efficiency and treatment effect, large negative friction resistance around piles, low moisture content of loess, etc., to achieve The reinforcement effect is remarkable, the effect of improving the bearing capacity and accelerating the sinking rate

Active Publication Date: 2020-04-24
JIANHUA CONSTR MATERIALS (JIANGSU) CO LTD +1
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Problems solved by technology

However, in the natural state, the water content of loess is low and the structure is strong. If the pile sinking is carried out directly, the negative friction resistance around the pile will be too large, which will easily cause pile sinking difficulties, which will greatly affect the construction efficiency and treatment effect.
This has also become the main obstacle to the application of prefabricated pile composite foundation in collapsible loess areas

Method used

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  • Construction method for precast pile composite foundation, applied to elimination of loess collapsibility
  • Construction method for precast pile composite foundation, applied to elimination of loess collapsibility
  • Construction method for precast pile composite foundation, applied to elimination of loess collapsibility

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Embodiment

[0035] Refer to attached figure 1 , figure 2 and image 3 .

[0036] The construction method of prefabricated pile composite foundation for eliminating the collapsibility of loess comprises the following steps:

[0037] 1) Level the site before construction, measure and stake out according to the design drawings, mark the position of the vibration points, and the distance between vibration points 8 is determined to be 2.5m according to the design plan.

[0038] 2) Vibration point positioning: The crane suspends the special vibrating rod 2 to the designated point and aligns it. Adjust the vibrating rod 2 to be perpendicular to the ground. The verticality deviation of the vibrating rod 2 should not exceed 3%.

[0039] 3) High-pressure air injection: Turn on the air compressor to make the high-pressure air flow along the ventilation pipe 3 inside the vibrating rod 2 to the air injection hole 4 on the drill bit below the vibrating rod 2 . In order to prevent clogging, the dia...

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Abstract

The invention discloses a construction method for a precast pile composite foundation, applied to elimination of loess collapsibility. The method comprises the steps of (1) preparation for construction, (2) vibration point positioning, (3) high-pressure gas injection, (4) vibrating sinking, (5) lifting for pore formation, (6) insertion of a precast pile, (7) pile sinking, and (8) ending of construction. The construction method disclosed by the invention has the beneficial effects that based on a traditional construction method for the precast pile composite foundation, inter-pile loess is gradually compacted by vibration and collapsibility is eliminated through conveying of vibration energy aiming at the problem that collapsibility around a pile cannot be solved by a precast pile during processing of the collapsible loess foundation. In addition, during sinking of a vibration rod, high-pressure gas injection is added for quick pore formation, so the problem that the precast pile can hardly be sunk due to excessive side friction resistance in a loess area. The method is the economic and effective construction method for processing of the collapsible loess foundation.

Description

technical field [0001] The invention relates to a collapsible loess foundation treatment technology, in particular to a construction method of a prefabricated pile composite foundation that eliminates the collapsibility of loess, and belongs to the technical field of foundation treatment methods. Background technique [0002] The distribution of my country's loess accounts for about 6.6% of the country's land area, covering about 635,000 square kilometers of land in Northwest China, North China, and the Songliao Plain in Northeast China. Loess has remarkable characteristics such as large pores, loose structure, vertical joints, uniform composition without bedding, and collapsibility when it meets water. The collapsibility of loess and its cracks, subsidence, landslides and other problems have always been the difficulties and hotspots of engineering circles in loess areas. Ground treatment in collapsible loess areas is a difficult problem often encountered in civil engineeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D7/00E02D7/20E02D27/16E02D27/34E21B7/24
CPCE02D7/00E02D7/20E02D27/16E02D27/34E21B7/24
Inventor 刘松玉张雁毛由田曾彪章定文陈巧
Owner JIANHUA CONSTR MATERIALS (JIANGSU) CO LTD
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