What parts does the casing consist of?

Casing accessories include: casing adaptor, casing driver, casing shoe, and casing joint. Generally speaking, there are many types of full casing construction equipment. The commonly used ones on the market are: casing driver, casing oscillator, Vibroflot, casing rotator, full rotary drilling rig and dual power head multifunctional drilling rig. These products have their own advantages and are suitable for different geological characteristics and different engineering characteristics.

The casing driver (referred to as the driver) is a convenient casing driving device, which consists of a casing adaptor and a casing driver. Some brands on the market simplify the design of the casing adaptor and connect it with the power head, but the driving principle remains unchanged. The driver sinks the casing relying on the rotary drilling rig itself to provide torque and pressure. The casing adaptor is connected to the power head on the top and the casing driver on the bottom; the casing driver is connected to the casing on the bottom.

During use, the driver will not interfere with the drill tool and kelly bar, and the combined operation of sinking the casing and salvaging the rock and soil can be realized. The advantages of the driver are that the equipment structure is simple and the procurement cost is low. There is no need to add additional hydraulic stations or other large equipment to assist in construction. It can effectively improve construction efficiency and reduce construction costs in the construction of short piles and small-diameter piles. However, since the driver is limited by the torque and pressure of the drilling rig, if deep piles and large-diameter piles are encountered during construction, the torque and pressure will be insufficient, and the verticality of the piles is average.

The casing used in full casing construction is different from ordinary casing. According to its structure, it can be divided into single-wall casing and double-wall casing; according to its length, it can be divided into single-section 2-meter, 3-meter, and 4-meter casing sections. At present, double-wall casing construction is mainly used in the market. The double-wall casing section adopts an inner and outer double-layer barrel wall design, which can effectively improve the casing stiffness, and ensure the characteristics of inner and outer flatness in structure, which can reduce the frictional resistance of the external hole wall on the casing when the casing is lowered. At the same time, the inner barrel wall can play a good guiding role on the drill bit to prevent the drill bit from scratching the inner wall of the casing. The casing is connected in a button-type male/female joint form, and the number of joints varies depending on the diameter of the casing. This connection method is in line with international standards, ensuring the universality of the domestic/international market, and can be quickly connected to ensure a tight rhythm during the construction of the entire casing.

Limta Piling machinery (Hebei) Co., Ltd. mainly sells soil buckets, core barrels, drilling augers, kelly bar, rotary drilling casings, open-type drilling buckets, cleaning buckets, belling buckets and other rotary drilling tools, specializing in providing high-quality products and considerate services to a large number of enterprises. The construction of a rotary drilling rig is a highly technical systematic project. Only by fully understanding the equipment performance, the drilled stratum, site conditions, drilling tool selection, operating procedures, etc., and formulating a scientific construction plan, can the comprehensive advantages of the rotary drilling rig's construction quality and high efficiency be demonstrated.