Full Rotary Drilling Rig JAR260H
商品详情
Full Rotary Drilling Rig JAR260H
JAR260H
The full rotary drilling rig is a new, efficient and environmentally friendly piling machine that integrates full hydraulic power and transmission with electromechanical-hydraulic combined control. It offers extremely high vertical precision and can smoothly carry out the construction of cast-in-place piles, replacement piles, underground diaphragm walls and the removal of underground obstacles such as old piles under various complex geological conditions, with advantages unmatched by any other type of drilling rig. At present, full rotary drilling rigs are widely used in urban subways, deep foundation pit retaining secant piles, removal of abandoned piles (underground obstacles), high-speed railways, roads and bridges, as well as the construction of large and high-rise buildings in cities, reservoir and dam reinforcement, and other fields.
The full-casing construction method, also known as the "Benoto" method (BUROTO), is a cast-in-place concrete construction method first adopted by France in the early 1950s. It was gradually developed in Europe in the early 1960s and then in Japan, and is now used in many countries around the world.
In July 2003, a serious collapse accident occurred on Shanghai Rail Transit Line 4. An important part of the repair project was to cut and remove the reinforced concrete and other objects of the already-built tunnel located 40 meters underground. For this purpose, Shanghai Tunnel Engineering Co., Ltd. introduced the full rotary method in August 2003 from the full rotary drilling rig manufacturer Nippon Sharyo, and the construction of the first section was completed in September, fully meeting the expected requirements. This was the first use of a full-casing full rotary drilling rig in China. With the rapid development of China's economy, the full rotary method has now become a new, environmentally friendly and efficient drilling technology, and has been widely applied in projects such as urban subways, deep foundation pit retaining secant piles, removal of abandoned piles (underground obstacles), construction of high-speed railway, road, bridge and urban construction piles, and reinforcement of reservoirs and dams. In recent years, as urban buildings have become larger and taller, it is required to reliably construct foundations on deep bearing strata under all foundation conditions, while minimizing public nuisance and achieving high strength, high safety and high precision. The full rotary construction method satisfies these requirements well, and therefore it is currently recognized by most countries in the world as a construction method that can "solve difficult problems."
No noise, no vibration, high safety performance;
No use of mud, clean working surface, avoiding the possibility of mud entering the concrete, high pile quality, and helping to improve the bond strength of concrete to rebar;
When operating the drilling rig, the formation and rock characteristics can be judged very intuitively;
Fast drilling speed, reaching about 14 m/h for general soil layers;
Large drilling depth, up to about 80 m depending on soil conditions;