BOERR
Construction Characteristics of Horizontal Directional Drilling

Construction Characteristics of Horizontal Directional Drilling

1. Directional drilling construction will not hinder traffic, will not destroy green space and vegetation, and will not affect the normal life and work order of shops, hospitals, schools and residents. It solves the interference of traditional excavation construction on residents' life, traffic and environment, and the damage and adverse effects on the surrounding building foundation.

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Horizontal directional drilling rig system configuration

Horizontal directional drilling rig system configuration

Drilling rig system: it is the main body of drilling operation and backdragging operation of crossing equipment. It is composed of drilling rig host, turntable, etc. The main rig is placed on the rig frame to complete drilling and towing operations. The rotary table is installed at the front end of the main machine of the drilling rig and connected with the drill pipe. By changing the turntable steering, output speed and torque, it can meet the requirements of different working conditions.

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Application of double-wheel slotting machine

Application of double-wheel slotting machine

According to the geological conditions of generally high soil strength in the whole slotting construction range of the upper Shagou station and the lining requirements of the slotting depth of the continuous wall, the milling and grasping combined construction process is adopted, that is, the ordinary hydraulic grab slotting machine in the area that cannot be drilled, first use two-wheel milling slotting machine for construction, and then combine with the ordinary hydraulic grab slotting machine to construct a thicker clay layer. According to the analysis of the geological conditions of the Upper Shagou Station, the first-class sodium bentonite [21] is mixed with mixing water to form mud for the retaining wall of the tank.

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Precautions when using rotary excavators

Precautions when using rotary excavators

Rotary drilling rig has obvious advantages in the construction of bored piles in subway engineering, strong applicability, high degree of automation, low labor intensity, high drilling efficiency, good fluff quality, and low environmental pollution. Can significantly improve the construction efficiency and engineering quality. When the construction method and construction technology are reasonably selected, the materials, financial resources, manpower and other resources can be saved to the maximum extent. For enterprise efficiency and social security has a win-win significance.

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Rotary excavation is a kind of construction method suitable for hole-forming operation in building foundation engineering.

Rotary excavation is a kind of construction method suitable for hole-forming operation in building foundation engineering.

Rotary excavation is a kind of construction method suitable for hole-forming operation in building foundation engineering. It is mainly suitable for the construction of sand, cohesive soil, silt and other soil layers, and is widely used in the construction of cast-in-place piles, continuous walls, foundation reinforcement and other foundations. The rated power of rotary drilling rig is generally 125 ~ 450kW. The output torque is 120 ~ 400kN · m, the maximum hole diameter can reach 1.5~4m, and the maximum hole depth is 60~90m, which can meet the construction requirements of various large-scale foundations.

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