With the advancement of industrialization and urbanization, the amount of pile foundation construction is increasing day by day. Rapid development of infrastructure construction, more and more tall, large, and heavy construction projects. In the pile foundation industry, based on the bearing capacity needs of high-rise, super high-rise buildings and large bridges, as well as environmental protection (smoke pollution, noise), vibration, construction quality, and work efficiency, bored piles have gradually replaced prefabricated piles. Become the mainstream form of pile foundation.
Construction technology of rotary drilling rig
The construction technology of rotary drilling rig is a relatively advanced pile foundation construction technology that has been promoted and used in my country in recent years. It is known as “green construction technology” and has the following characteristics: First, advanced equipment performance, high degree of automation, and low labor intensity. The rotary drilling rig is mainly a crawler-type full-hydraulic self-propelled drilling rig, which adopts a complete set of hydraulic systems and is equipped with an advanced computer operating system. It can move by itself on the construction site and stand on its own mast. It is convenient and fast to move and align holes. Second, it has a wide range of adaptability to the stratum. It can be constructed for piles with a diameter of 0.6m to 2.5m and a depth of fewer than 70 meters. The drilling efficiency is high, and the drill bit can quickly pass through various strata to quickly form holes; under normal circumstances, The drilling speed in the sand layer can reach 10m/h, and in the clay, the layer can reach 4.6 m/h, which is 3 to 5 times that of ordinary rotary drilling rigs. The third is good environmental protection. The rotary drilling method uses a power head device and a pressurizing mechanism. Its working principle is that the short auger bit or the rotary bucket uses a strong torque to directly rotate and excavate drilling slags such as soil or gravel, and then quickly Outside the proposed hole, dry construction can be realized without the need for mud support; even in the case of special formations that require mud wall protection, the mud only plays the role of hole wall support, and the mud content in drilling is low, improving The construction environment is improved, and the construction cost is reduced at the same time; the fourth is to improve the bearing capacity of the cast-in-situ pile. Due to the special hole-forming process of the rotary drilling rig, it only needs static pressure mud as the retaining wall, and no thick mud skin will be formed on the hole wall, In addition, due to the multiple up and down reciprocations of the drill bit, the hole wall roughness is high, and it is not easy to shrink the diameter, and the hole is more regular, which is 20% higher than the traditional bored pile. The construction technology of rotary drilling rigs has been widely used in road and railway construction before, and it has also been gradually applied in residential pile foundations in recent years.
related: pile cutting machine
Rotary Drilling Rig Introduction
A rotary drilling rig is a construction machine suitable for hole-forming operations in construction projects. Widely used in municipal construction, highway bridges, high-rise buildings, and other ground construction projects, with different drilling tools, suitable for dry (short screw), or wet (rotary bucket) and rock formation (core drill) hole-forming operations, rotary drilling The drilling rig has the characteristics of large installed power, large output torque, large axial pressure, flexible maneuverability, high construction efficiency, and multi-function. The rotary drilling rig is suitable for the soil and geological conditions in most areas of our country and has a wide range of applications. It can basically meet the needs of bridge construction, high-rise building foundations, and other projects. At present, rotary drilling rigs have been widely used in various boring pile projects.
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Rotary drilling rig application
A rotary drilling rig is a pile engineering machine used for drilling piles on-site in pile foundation engineering. It has many functions and is suitable for the following ranges. the
(1) Configure different drilling tools such as short auger bits, helical rotary buckets, core auger bits, etc., and adopt corresponding drilling technology, which can be applied to various cohesive soils, silt soils, filling soils, sandy soils above medium density, Dry type (short auger drilling rig) or wet type (rotary bucket drilling rig), rock formation (core drilling rig) drilling operations in gravel soil, medium hardness weathered rock formation. the
(2) Equipped with a hydraulic piling hammer, it can be used for the construction of prefabricated concrete piles or steel piles for building foundations. the
(3) Equipped with a long auger bit and a hydraulic grab, it can carry out long auger drilling and underground diaphragm wall construction respectively.
Due to the above-mentioned characteristics, and its construction safety, civilization, good quality, low pollution, and high efficiency, this equipment is widely used in the foundation construction of large-scale key projects such as roads, bridges, docks, and high-rise buildings. The main hole-forming equipment for cast-in-situ pile construction.
