The Differentiation of Rotary Drilling Tools in Metro Pile Foundation And Bridge Engineering

In underground engineering and bridge construction, rotary drilling tools play a significant role, but the requirements for them vary greatly in different scenarios. Want to know what the differences are between rotary drilling tools in metro pile foundation and bridge engineering? Now let's break it down for you in detail.

1. Drilling depth requirement: Metro pile foundations are usually buried relatively shallowly, mostly around 20 to 30 meters, to cope with the shallow geological structure of the city. The drilling depth in bridge engineering is generally much deeper. For instance, the depth of the pile foundation of a cross-river bridge can reach 60 to 70 meters or even over a hundred meters, and the drilling tools need to meet the requirements of extremely long drilling.

2. Difference in aperture size: The construction space for subways is limited, and the aperture of pile foundations is generally between 1 and 1.5 meters. Bridge engineering, due to the need to bear greater weight, usually has diameters ranging from 1.5 to 3 meters or even larger. The specifications of the drilling tools should be adapted to the construction of larger diameters.

3. Emphasis on geological adaptability: Metro construction is mostly carried out in the soft soil layer of cities. Drilling tools should pay attention to dealing with soft soil such as silt and clay, and preventing hole collapse is the key. Bridge engineering geology is complex and may involve rock, gravel layers, etc. Drilling tools need to have a stronger ability to break hard rock.

4. Requirements for equipment mobility: The construction site of the subway is narrow. The rotary drilling tools should be small and flexible to facilitate relocation within a limited space. Bridge engineering sites are spacious, and more emphasis is placed on the high power and stability of drilling tools. The requirements for mobility are relatively low.

5. Construction efficiency considerations: Due to the tight construction period of the subway, small and highly efficient drilling tools are mostly used to pursue rapid hole formation. Bridge engineering has a long construction period. Appropriate drilling tools will be selected based on geological conditions, and more emphasis will be placed on construction quality rather than merely pursuing speed.

6. Cost control direction: The investment in drilling tools for metro projects focuses on cost performance, and economic equipment that meets the construction requirements is given priority. Bridge engineering, due to its extremely high quality requirements, will select drilling tools with better performance and durability, and the cost budget is relatively lenient.

Understanding these differences reveals that the selection of rotary drilling tools should be adapted to local conditions. Whether it is a metro pile foundation or a bridge project, only by choosing the right drilling tools based on the specific construction conditions and requirements can the project be smoothly advanced and completed efficiently.