Rotary drilling rig appraisal

rotary drilling rig is a mechanical equipment for taking soil to form a hole for cast-in-place pile construction. The drill pipe drives the rotary bucket to rotate and cut the soil, and then lifts it to the soil outside the hole for periodic cycle operations. The rotary drilling rig adopts a multi-purpose modular design and can be used for the construction of a variety of piles. It is more convenient and efficient than previous pile drivers.
rotary drilling rig is widely used in foundation engineering, bridge construction, ocean engineering, urban construction and other fields. It is an important tool in modern construction, which can improve construction efficiency and has good performance in project quality and safety performance.
Zhongke Testing and Appraisal Institute can provide rotary drilling rig appraisal services and make accurate appraisals in terms of product design analysis, product load analysis and product quality analysis.

Classification according to specifications: Rotary drilling rigs can be classified according to the diameter of the drill pipe. Common specifications include 600mm, 800mm, 1200mm, 1500mm, etc. These different sizes of equipment are suitable for drilling work of different diameters.
is classified according to structural form: rotary drilling rigs can be divided into crawler, wheeled, trailer, self-propelled and Caterpillar models. Each structure of rotary drilling rig has its specific advantages, disadvantages and application scenarios.
is classified according to the scope of application: rotary drilling rigs can be used in many fields such as land foundation engineering, highway construction, bridge construction and construction engineering.
is classified according to the working mechanism: the working mechanism of the rotary drilling rig can be fully hydraulic, dual torque control, fully electromechanical control or multi-arm resistance type, etc. Rotary drilling rigs with different mechanisms have different drilling effects, stability and efficiency.

GB/T 21682-2019 Rotary drilling rig
GB/T 25695-2010 Building construction machinery and equipment General regulations for hole forming construction of rotary drilling rigs
JB/T 11168-2011 Building construction machinery and equipment Rotary drilling rig telescopic drill pipe

An engineering company signed a purchase agreement with a machinery company and purchased an S××× rotary drilling rig from the machinery company. After receiving the goods, the engineering company found that the main components of the "rotary drilling rig" involved in the case had obvious signs of refurbishment, and the power did not meet the contract requirements, so they complained to the XX Municipal Quality Supervision Bureau.
Our company was entrusted by the Quality Supervision Bureau to undertake the quality analysis of the "rotary drilling rig" involved in this case.
identification and analysis results:
The quality analysis expert group discussed and comprehensively analyzed the relevant information, on-site investigation and inspection data of the "rotary drilling rig" involved in the case, and made the following quality analysis opinions:
The machine involved has the physical evidence characteristics of bolt corrosion, rubber tube aging and paint re-spraying, and the machine involved is a refurbished machine.