Construction method of long protective tube impact-cone concrete pile in ultra-thick silt area

Abstract

The invention discloses a construction method of a long protective tube impact-cone concrete pile in an ultra-thick silt area, and relates to the technical field of impact-cone concrete pile construction. Above a sludge soil layer, a chopping bit with the diameter larger than 200mm of the pile diameter is adopted for chambering drilling and mud wall protection pore-forming, a sludge layer is entered, a long protective tube protective wall is adopted, a crawler crane is matched with vibration hammer hydraulic pliers to vibrate a long protective tube to perform sludge layer drilling, the sludgelayer is broken through, a chopping bit in line with the pile diameter is replaced to drilling and complete pore-forming, when punching reaches the design-required depth into rock clear, a hole is cleaned, a steel bar cage is lifted to designed elevation after the hole is cleaned, pile-forming construction is organized, concrete is poured, a guide tube is laid, the concrete is continuously pouredto above the designed pile top elevation 800-1000 mm, pulling out of the long protective tube and concrete replenishment of a pile body are organized, and pile-forming work is completed.

Description

technical field [0001] The invention discloses a construction method for a perforated cast-in-situ pile with a long casing in an ultra-thick silt area, and relates to the technical field of perforated cast-in-place pile construction. Background technique [0002] With the continuous development of economy and society and the continuous acceleration of the urban modernization process, urban land use is becoming increasingly tense, especially for cities in coastal areas. The method of using cofferdams to hoard soil to build islands and fill the sea to solve the ever-increasing land shortage has quietly emerged in coastal cities. [0003] The construction of perforated cast-in-situ piles under the geological conditions of short-term reclamation and land reclamation, because the soil has not been consolidated by its own weight, the soil stability is poor, and there are many gaps in the soil layer, which may easily cause grout leakage and hole collapse; Cylinder, small stroke of...

AI Technical Summary

Problems solved by technology

[0003] The construction of perforated cast-in-situ piles under the geological conditions of short-term reclamation and land reclamation, because the soil has not been consolidated by its own weight, the soil stability is poor, and there are many gaps in the soil layer, which may easily cause grout leakage and hole collapse; Cylinder, small stroke of drilling rig repeated impact, adding clay blocks and flakes to form holes" When the hole-forming process of perforated piles is applied in ultra-thick silt areas, because the silt layer is fluid plastic and thick, it is easy to cause collapsed holes and sinking hammers. The hole is difficult, the hole forming speed is slow, the construction period cannot be guaranteed, and the filling coefficient is large, resulting in material waste and cost increase.

The method of the present invention aims at the construction problem of pile-forming piles in super-thick silt areas under the geological conditions of short-term reclamation and land reclamation that have not completed self-weight consolidation, and provides a construction method for long-casing perforated piles in super-thick silt areas, which solves the problem of silt area erosion Hole-filled piles are used in the ultra-thick and weak soil layer using traditional technology, which is easy to collapse holes, stick hammers, and difficult to form holes, effectively ensuring the quality of piles, and at the same time reducing the filling factor of piles under such soil conditions, saving costs , to speed up the pile-forming speed and save the construction period

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