Advantages of Applying T76 Self-drilling Hollow Bar to Support Subway Foundation

T76 self-drilling hollow bar is an advanced system that could support and reinforce the rock formation. It combines the drilling, grouting, and anchoring into one step, which saves a lot of cost of the whole construction.

In a subway construction, due to the unstable formation and abundant groundwater, the traditional methods are not competent to do this. Therefore, after comparison, we determine to support the foundation with T76 sell-drilling hollow bar anchor system.

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 T76 self-drilling hollow bar system 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:

T76 self-drilling hollow bar has good supporting effect, simple construction, and is conducive to mechanized operation, and the construction speed is fast;

T76 self-drilling hollow bar has the advantages of high strength, high rigidity and high shear resistance in force;

T76 self-drilling hollow bar support works together with the surrounding rock to change the mechanical state of the surrounding rock to achieve a more stable foundation pit wall.

T76 self-drilling hollow bar 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 T76 self-drilling hollow bar 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.