Full-casing hydraulic hammering soil-squeezing cast-in-place pile device and construction method thereof

Abstract

The invention relates to a full-casing hydraulic hammering soil-squeezing cast-in-place pile device and a construction method thereof. The full-casing hydraulic hammering soil-squeezing cast-in-placepile device comprises an outer casing and a hydraulic hammer connected into the outer casing in a sleeve mode, wherein an inner pile tip is fixedly arranged at the bottom of the hydraulic hammer, correspondingly, an outer casing pile shoe abutting against the side wall of the inner pile tip is fixedly arranged at the bottom of the outer casing, and the hydraulic hammer drives the inner pile tip tomove downwards so as to drive the outer sleeve and the outer sleeve pile shoe to move downwards synchronously. According to the full-casing hydraulic hammering soil-squeezing cast-in-place pile device and the construction method thereof, the structure is simple, the design is reasonable, on one hand, the work amount of outward transportation of earthwork and mud is reduced to the maximum extent,pollution of the building muck and mud to the surrounding environment is avoided, on the other hand, the pile end bearing capacity and the pile side friction force of foundation soil are improved through compaction of a soil body, the use amount of piles is reduced, therefore, compared with various existing pile foundation construction methods, the construction method has the advantage that the work efficiency is improved by times or above.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a full-sleeve hydraulic hammering soil-squeezing grouting pile device and a construction method thereof. Background technique [0002] At present, there are dozens of pile foundations used in various projects. According to different construction techniques, the current dominant pile types in my country are divided into bored cast-in-situ piles, vibrating cast-in-place piles, rammed and expanded piles, artificial excavated piles, and prestressed pipe piles. piles and various flexible and semi-flexible piles for soft foundation treatment (such as cement mixing piles and powder spray piles, high-pressure rotary spray piles, sand and gravel piles or gravel piles), etc. As far as the various dominant pile types are currently used, there are the following problems: [0003] (1) Bored piles often have quality problems such as broken piles, necking, and segregat...

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Problems solved by technology

[0003] (1) Bored piles often have quality problems such as broken piles, necking, and segregated mud, which cause hidden dangers in the project; the construction process is complicated, the construction time is long, and the labor input is large; the amount of solid waste is large and the environmental pollution is serious; The bottom sediment is not easy to discharge and the pile side mud skin left by the mud retaining wall greatly reduces the bottom reaction force and side wall friction of the cast-in-place pile, reducing the bearing capacity of the pile foundation

[0004] (2) Although the quality of prestressed concrete pipe piles is well controlled, they must be prefabricated in factories. The piles have poor shear performance and are not suitable for foundation pit enclosure piles. It is difficult to guarantee the welding performance and anti-corrosion performance of uplift piles. Pressure-pile construction equipment is bulky and has high site requirements. The use of diesel hammers causes great environmental pollution and noise, and is not suitable for construction in urban areas.

[0005] (3) The vibrating cast-in-situ pile and the rammed pile are all pile types with small bearing capacity, the cross-sectional area of ​​the pile is small, the bearing capacity and shear resistance are small, and it is not suitable for the main pile type of foundation pit enclosure piles and high-rise buildings

Generally speaking, prefabricated pipe piles or square piles are easy to construct, less environmental pollution, lower cost, easy to adjust the diameter of bored (rotary excavation) cast-in-situ piles, and the bearing capacity can increase with the increase of pile diameter. But the cost is high, and the mud and earthwork are transported to the outside, causing great pollution to the environment

In recent years, through the introduction of foreign technology, the full-sleeve rotary excavation cast-in-place pile and the rubbing pipe flushing soil grabbing pile have been introduced. Although the problems of soil extrusion and mud pollution have been solved, these equipment are expensive and the construction cost is extremely high. It must be transported abroad, the bearing capacity is no different from ordinary cast-in-situ piles, and the comprehensive effect is not high

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