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Home > News > Industry Information > What Projects Can Self-drilling Hollow Rock Bolts Be Applied to?

What Projects Can Self-drilling Hollow Rock Bolts Be Applied to?

The self-drilling hollow rock bolt is a new type of support material that integrates drilling, grouting, and anchoring functions, and is widely used in various engineering projects. Today, Sinorock will introduce to you what projects self-drilling hollow rock bolts can be applied to.


Self-drilling hollow rock bolts can be used as tunnel entrance stabilization, lead beam, end face stabilization, forward pipe piles, cable foot piles, and radial supports. For submarine tunnels, we can choose stainless steel self-drilling bolts, which have a longer service life due to their resistance to corrosion by air, water, chemical agents, etc. Selection is a good helper for tunnel engineering construction.

rock bolts in tunnel

Retaining Wall

Selecting the self-drilling bolt to be applied here can greatly simplify the construction procedure of the bolt project and expand the application field of the bolt in the support project.

Before construction, select the appropriate type of bolt according to its design bearing capacity, and determine the hole diameter of the hole by the size of the bolt bit or according to the test. The hole diameter of the drill bit is different in different formations. Generally, the hole diameter is equal to 1.5-2.5 times the diameter of the drill bit.

retaining wall


In slope engineering, self-drilling hollow bolts are usually used to stabilize broken and loose rock masses. Because it does not need a casing pipe, it is suitable for the treatment of diseases such as formations with easily collapsed holes, reinforcement of existing structures, and grouting to fill cracks.

rock bolts in slope

Hydropower Station

Complex geological conditions such as weak surrounding rock and fault fracture zones are common in water conservancy projects and various underground projects, which bring great difficulties to the construction of rock anchors, especially in the case of serious hole collapse and the need for extra-long bolts. Ordinary mortar bolts are difficult to construct.

Based on the construction of a diversion channel for slope excavation supporting the Bando Hydropower Project, in the case of broken rock and clay rock fed by ordinary mortar bolts, grouting hollow bolts instead of mortar bolts can overcome the problems caused by them. If the construction is slow, the bolt insertion is difficult and the hole collapses, thereby ensuring the stability of the surrounding rock.

Self-drilling hollow rock bolts are increasingly being used in hydroelectric power plants and dam construction projects. In terms of the geology of the power station, both sandstone and siltstone are susceptible to weathering. Then, it's hard to punch holes in weathered rock. Self-drilling hollow bolts have great advantages over other anchoring systems in weathered rock, fracture zones, loose soil, and backfilled ground conditions. It can effectively solve the problems of wellbore collapse and drilling. At the same time, the application of self-drilling hollow bolts can ensure construction quality and have great social benefits.

Hydropower Station


The combined control technology of high-performance bolts and high-strength hollow grouting anchor cables can effectively control the roadway instability problems in roadways such as high-stress soft coal roadways. During the deep excavation of a mine working face return air level roadway, there are problems such as large deformation of surrounding rock and failure of support. High ground stress, poor surrounding rock properties, and unreasonable original bolt support parameters are the main factors that lead to roadway instability.


Under the complex geological conditions of soft soil and high groundwater level, it is easy to cause potential safety hazards such as soil slippage, unstable foundation, deflection of pile body, serious leakage, and serious damage. In this case, we can use hollow anchor bolts as a kind of miniature pile to control and secure them.

Hollow rock bolts provide lateral or vertical forces to resist the movement of the fixed structure. Hollow anchor bolts are often used for excavation support or as part of a permanent retaining wall, or to resist pull-up forces on foundations. Construction companies often use hollow anchor bolts to stabilize slopes and walls, provide securing devices for bridges, stabilize dams, and secure caisson bottoms, among other things.


With the development of the economy and society, construction technology is also constantly developing to meet the needs of modern construction projects. This self-drilling hollow rock bolt is an evolving construction measure that allows drilling, anchoring, and grouting in a single operation.