Water-rich sandy gravel geological pile group hole forming construction method

Abstract

The invention discloses a water-rich sandy gravel geological pile group hole-forming construction method which comprises the following steps of construction investigation, paying-off and pile position fixing, mounting of a positioning pile casing, primary drilling, mounting of a protection pile casing (1), secondary drilling, hole cleaning and hoisting and placing of a reinforcement cage lamp.The method includes the following steps that firstly, construction investigation is sufficient, pile casing materials are prepared in advance, material preparation can be optimized in combination with construction organizations, and the construction efficiency is improved; the pile casing machining and coring time is saved, and under the general condition, the whole pile casing is installed, and the protection wall forming efficiency is high; 2, drilling is performed twice, and the hole forming part influenced by rich water follows the protective casing, so that the mounting time of the protective casing is greatly saved; and (3) the steel wire mesh can effectively reduce the time for lowering steel bar holes and cleaning sediments at the bottom of the pile. The method is high in construction efficiency, small in environmental pollution, large in safety coefficient, capable of guaranteeing quality and suitable for hole forming construction of the rock-socketed rotary excavating pile in the water-rich sandy gravel geology.

Description

technical field [0001] The invention relates to the technical field of technical facility construction, in particular to a hole-forming construction method for water-rich sand and pebble geological group piles. Background technique [0002] Common pile foundations can be divided into auger drilling method, impact drilling drilling method, rotary drilling drilling method and manual drilling method according to the different hole forming process. Spiral drilling is mainly suitable for filling soil, clay soil, silt soil, sandy soil and pebble gravel layer construction above the groundwater level. It has high requirements on geological conditions and fast hole forming efficiency. Impact hole forming has a wide range of applications, but there are problems of high noise and environmental pollution. Rotary drilling rigs are generally suitable for clay, silt, sand, silt soil, artificial backfill and formations containing some pebbles and gravel, and are widely used in construction...

AI Technical Summary

Problems solved by technology

Manual digging is generally suitable for clay with good soil quality, low groundwater level, and clay layers containing a small amount of sand and pebbles. The safety risk is high, but the hole-forming quality is good, and it is often used in places where hole-forming machines cannot reach.

[0003] For some foundations close to rivers, the underlying bedrock is sandy mudstone, which is generally divided into strong weathering zone and moderate weathering zone. There is no better pile hole forming method for this kind of geology

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