Large Diameter Self-drilling Rock Anchor Used in Subways Foundation Support

Due to the limitation of the section form, surrounding environment and geological conditions of urban subway stations, the enclosure structure generally adopts the form of bolt support. At present, with the continuous increase of the excavation depth of the subway open cut station, the surrounding construction environment is becoming more and more complex, and the length and diameter of the rock bolt are also increasing and increasing.

Under the action of the maximum horizontal stress, the surrounding rock will appear interlayer dislocation, resulting in the deformation of the foundation pit. The role of the bolt is to restrain the shear dislocation of the rock stratum along the axial direction, so the main advantages of using the pile-anchor support type in this open-cut foundation pit are as follows:

The large-diameter self-drilling rock anchor bolt has good supporting effect, simple construction, and is conducive to mechanized operation, and the construction speed is fast.

The large diameter bolt has the advantages of high strength, high rigidity and high shear resistance in force.

The large-diameter self-drilling rock anchor bolt support works together with the surrounding rock to change the mechanical state of the surrounding rock to achieve a more stable foundation pit wall.

The large-diameter self-drilling rock anchor bolt support provides a large space for the construction of the internal structure of the foundation pit, avoids the safety risks caused by the replacement of the support, and effectively ensures the stability of the foundation pit during the construction process.

The successful application of the large-diameter rock anchor bolt in the subway open-cut foundation pit provides a safe and reliable space for the foundation pit excavation and structural construction and avoids the necessary switching support operation using inner braces. Under the premise of effectively saving the project cost, the construction risk is reduced, and the project construction period is ensured.

The bolt sizes produced by Sinorock include regular sizes R25, R32, R38, R51, R63, T30, T40, T52, and large diameter self-drilling rock anchor bolts T73, T76, T103, T111, T127, T130, T150 and T200, etc. At the same time, Sinorock can also provide customized products according to the specific requirements of customers. If you need our products, please contact us at sinorock@sinorockco.com, we’ll response in less than 12 hours.