tailieunhanh - Máy khoan cọc nhồi

Máy khoan cọc nhồi là một loại thiết bị xây dựng dùng để tạo lỗ cọc nhồi trong công nghệ thi công cọc nhồi bê tông hay vữa xi măng (tức là lấy đất lên khỏi nền để hình thành hố đào) bằng phương pháp khoan. Máy khoan cọc nhồi kiểu mũi khoan cánh xoắn (guồng xoắn): khi khoan vào trong đất các lưỡi khoan, làm việc giống như các mũi khoan khoan gỗ hay thép, đẩy đất lên qua cánh xoắn. Cũng có loại máy khoan guồng xoắn gồm nhiều mũi khoan, lồng cánh xoắn vào nhau và xếp. | Piles and Pile Driving Jackson Tukuafu Brandon Smith // Safety First Pile Driving Terminology Anchor Pile: pile that is connected to a structure Butt of pile: the fat end of the pile Cushion: spreads out impact of the hammer Cutoff: height you cut your pile after its been driven Downdrag: condition that adds load to the installed pile Driving cap/ helmet: protects top of pile while being driven Embedment: how much is in the ground Overdriving: too much driving damages your piles Penetration: how far it goes in each time you hit it Pile bent: more than one pile driven in a cluster Pile-driving shoe: Metal shoe on bottom end to make it go in better Soldier pile: holds up an excavation Tension pile: holds structure down from being pulled out Pile Hammers Types of Hammers Drop Hammers Single-acting steam or compressed air Double-acting steam or compressed air Differential-acting steam or compressed air Diesel Hydraulic-impact and drivers Vibratory drivers Hammer selection considerations: Number of piles Character of the soil Location of the project Topography of site Equipment available Pile driving on land or water Pile Hammers Drop Hammers Only used in remote areas with less piles Time of completion is not important Productivity 4-8 blows/min Not suitable for concrete piles Pile Hammers Double-Acting Hammers “ram” is driven by compressed air to steam both when rising and when falling 95-300 blows/min. Lighter ram and high Pile Hammers*** Single-Acting Hammers 40-60 blows/min Sizes vary 7000-1,800,000 ft-lb/blow “Ram” is lifted by steam or compressed air and then dropped Pile Hammers*** Differential-Acting Uses the advantages of a single- and double-acting hammers Pile Hammers Diesel Hammers Open end 40-55 blows/min. Close end 75-85 blows/min. Used in cohesive or very dense soils Pile Hammers*** Hydraulic Impact Hammers Operates on differential pressure of hydraulic fluid Uses a power unit | Piles and Pile Driving Jackson Tukuafu Brandon Smith // Safety First Pile Driving Terminology Anchor Pile: pile that is connected to a structure Butt of pile: the fat end of the pile Cushion: spreads out impact of the hammer Cutoff: height you cut your pile after its been driven Downdrag: condition that adds load to the installed pile Driving cap/ helmet: protects top of pile while being driven Embedment: how much is in the ground Overdriving: too much driving damages your piles Penetration: how far it goes in each time you hit it Pile bent: more than one pile driven in a cluster Pile-driving shoe: Metal shoe on bottom end to make it go in better Soldier pile: holds up an excavation Tension pile: holds structure down from being pulled out Pile Hammers Types of Hammers Drop Hammers Single-acting steam or compressed air Double-acting steam or compressed air Differential-acting steam or compressed air Diesel