Construction method of big-diameter PHC prefabricated pipe pile and piling machine for implementing method

Abstract

The invention discloses a construction method of a large-diameter PHC prefabricated pipe pile. The method comprises the following steps of putting the piling machine in place; regulating an inclination angle; mounting the large-diameter PHC prefabricated pipe pile; performing hammering pile conveyance through a soft soil layer; aligning a guide hole; internally drilling the guide hole; performinghammering alignment; and performing hammering pile conveyance to a hard soil layer. The invention also discloses piling equipment for implementing the method. A hammering mode is used for pile foundation construction in the soft soil layer of a foundation; a large-diameter PHC pipe pile is sunk into the soft soil layer; the lateral friction resistance between the upper part of the pile foundationand the soft soil layer is ensured; the bearing force of the pile foundation is improved; a mode of firstly forming the guide hole and then performing hammering is used on the hard soil layer of the foundation; the problem of a plugging effect of the hard soil layer on the large-diameter PHC pipe file is solved, so that the large-diameter PHC pipe pile can be smoothly sunk into the hard soil layer; by regulating the inclination angle of a tower frame, the inclination angle of the large-diameter PHC pipe file is accurately controlled; and the precise and high-efficiency construction of the large-diameter PHC pipe file with the set inclination angle is realized.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction equipment, in particular to a large-diameter PHC prefabricated pipe pile construction method and a pile driver for implementing the method. Background technique [0002] Pile foundation construction in the prior art generally includes steel piles, bored piles, and PHC pipe piles. [0003] Since steel piles are made of steel, the material has good hardness and toughness, and a large hammer force will generally not damage the pile. At the same time, due to the high strength of steel and the small cross-section of the pile, its ability to penetrate the soil layer It is also better, and generally its quality through thicker sandy soil layers is guaranteed. However, the cost of steel piles is too expensive, so many expensive steel materials are driven underground, which is unbearable for ordinary owners. Nowadays, steel piles are less and less used in engineering foundation treatm...

AI Technical Summary

Problems solved by technology

[0005] 1) Compared with PHC piles, the bearing capacity of single piles with the same diameter is lower due to the lack of soil squeezing effect

[0006] 2) The quality of pile sinking is restricted by the construction conditions on site. It is necessary to form holes on site, make steel cages, and the concrete pouring process is complicated, and the construction is cumbersome. It is difficult to control the quality of piles.

[0008] 4) The construction speed is restricted by the equipment, and the pile sinking speed of each pile for each pile foundation is slower than that of PHC piles

[0009] 5) The construction site of bored piles will be dirty with mud flowing all over the ground, and the construction site will be busy with pumping and piling up soil.

[0010] 6) If there are karst caves or underground rivers in the pile foundation soil layer, it will cause a large amount of concrete overfilling and cause large economic losses

[0014] 1) Due to the use of the whole pre-pilot hole, the upper part of the pile foundation has no soil squeezing effect, and the side friction resistance between the upper part of the pile foundation and the soil layer will be lost, and the bearing capacity is low

[0015] 2) Due to the use of two sets of equipment, the rotary pile driver and the hammer pile driver, to complete the pilot hole and hammering construction of the PHC pipe pile respectively, it is difficult to ensure the same inclination, and it is difficult to complete the construction of the inclined pile

[0016] 3) Due to the narrow construction site of the pile group, two equipments, the rotary pile driver and the hammer pile driver, are used, and the coordination of the two equipment is difficult, which has a great impact on the project cost, quality, safety, progress, etc.

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