The rotary drilling rig has the characteristics of large installed power, large output torque, large axial pressure, flexible rotation, high construction efficiency, and environmental protection. It can adapt to the geological conditions in most parts of my country with different drilling tools, making it the most ideal construction machinery for drilling operations in building foundation projects.#drilling rig system#
Improvements in concrete quality, refinements in pile foundation construction techniques, increased bearing capacity of cast-in-place piles, and stricter enforcement of urban environmental regulations have led to cast-in-place concrete piles virtually replacing other foundation types, becoming the most widely used. The proportions of various drilling machines (reverse circulation, rotary drilling rigs, and full casing) used in bored pile construction vary significantly between China and abroad. In large-diameter cast-in-place concrete pile construction abroad, rotary drilling rigs generally account for over two-thirds, while direct and reverse circulation rigs are virtually obsolete in European cities. In contrast, direct and reverse circulation rigs account for nearly 90% of domestic drilling machine production.#drilling rig system#
Rotary drilling rigs, with their high installed power, high output torque, high axial pressure, flexible rotation, high construction efficiency, and environmental friendliness, are ideal for bored pile construction in building foundation projects. When combined with various drilling tools, they can adapt to the geological conditions of most regions in my country, making them the most ideal construction machine for bored pile construction in building foundation projects. In recent years, rotary drilling rigs have been recognized for their high efficiency, environmental friendliness, and high profitability in the construction of large-scale projects such as the Beijing Metro and ring lines, and particularly in projects such as the Qinghai-Tibet Railway, Olympic venues, and the new terminal at Beijing Capital Airport. With the gradual deepening of reform and opening up, the needs of domestic economic development have led to the comprehensive development of pile foundations in the construction of railways, highways, waterways, urban public facilities, industrial and civil buildings, water conservancy and power facilities, ports, terminals, and airports. A huge potential market for corresponding construction machinery has emerged. In railway construction alone, total investment will exceed 2 trillion yuan by 2021, with an average annual investment of over 100 billion yuan. Over 60% of high-speed passenger dedicated lines are bridges, with piles mostly around 1200mm in diameter and depths of less than 40m, making them ideal for rotary drilling rigs. This will be the largest-scale application of rotary drilling rigs in railway construction since the Qinghai-Tibet Railway.
Rotary drilling rigs and their construction techniques have rapidly gained popularity and recognition in northern my country. In southern China, especially in the developed southeastern coastal areas, due to the softer strata, pile foundations are generally larger and deeper, making it difficult for rotary drilling rigs to drill holes. Currently, forward and reverse circulation drilling rigs are still the primary method. In fact, rotary drilling rigs can also be used in conjunction with other equipment in this area. One method involves combining a rotary drilling rig with a casing drilling rig. Another method utilizes a vibratory pile hammer, a widely used method in my country, to sink and extract steel casings in soft soil. This has been proven feasible in projects such as the Zhejiang Datang Wushashan Power Plant, the Ningbo Jinhua Lanxi Power Plant, and the Fujian Ningde Power Plant.
Rotary drilling rigs have only been widely used in my country in recent years. Due to the lack of corresponding product standards, the lack of established rotary drilling rig construction specifications, systematic research on construction methods, and a lack of technical training, in-depth research on basic theory is needed. Rotary drilling rigs are closely integrated with civil engineering and construction techniques. Rotary drilling rig designers should be familiar with pile foundation construction, and engineers and technicians using rotary drilling rigs should understand their operating principles and performance to facilitate the further development of rotary drilling rigs and their construction methods.#drilling rig system#
