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

A construction method and technology of sand and pebbles, which are applied in sheet pile walls, earthwork drilling, and foundation structure engineering, can solve problems such as high safety risks, large construction impacts, and good hole quality, achieving low environmental pollution and high quality Guaranteed and high safety factor

Pending Publication Date: 2022-07-15
THE THIRD CONSTR OF CHINA CONSTR EIGHTH ENG BUREAU
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  • Application Information

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

Method used

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

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Embodiment Construction

[0027] The present invention will be further described below with reference to the embodiments and the accompanying drawings.

[0028] like Figure 1-3 As shown in the figure, a construction method for hole formation of water-rich sand and pebble geological group piles is specifically described on the basis of the following geology: the underlying bedrock of the geology is sandy mudstone, which is divided into strong weathering zone D2 and medium weathering zone D1, strong wind The thickness of D2 is 0.5-3.0m, the bottom boundary fluctuates with the bedrock surface, the weathering is strong, and the core is broken. The core of D1 in the middle weathering zone is relatively complete, mostly in columnar or short columnar shape, and the middle weathering zone D1 is located below the strong weathering zone D2. , the boundary line between the two is F2, the upper covering layer of the underlying bedrock is the sand and gravel backfill layer D3, the boundary line between the D3 laye...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/38E02D15/08E21B7/04E21B7/10E21B33/138
CPCE02D5/38E02D5/385E02D15/08E21B7/10E21B7/04E21B33/138
Inventor 杨光旭马磊段鸿川胥浩袁堃
Owner THE THIRD CONSTR OF CHINA CONSTR EIGHTH ENG BUREAU
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