Description

The bonding to the rock results from the friction which is formed between the extended bolt and the rock. 

Friction bolts can be subjected to the full load directly after they have been positioned and are immediately able to absorb the rock movements. 

The carrying force is applied along the complete length of the inserted bolt...

Technical Data:

Premium line (PM)

The Premium line is a typical tunneling bolt, with a high yield load and good deformability. PM rock bolts can also be used in mining when low to medium stress conditions require a stiff Hengdaanchor®  rock bolt with a high yield load. 

Features:

The Hengdaanchor® rock bolt is sealed at one extremity; the other extremity is equipped with a special head bushing used for inflation. The expansion of the bolt, inside the borehole, creates a friction and interlocking anchor, which provides full column support and support on the whole length of the borehole. 

Due to this anchorage mechanism, the Hengdaanchor TM  bolt can adapt to a wide variety of rock conditions and provides good to excellent anchorage capacity. The steel profile can adapt shear movements without failure.

The simplicity of the system can explain its performance. The operator simply drills a hole in the rock, inserts the bolt and then inflates it to a pre-determined pressure using a specially designed inflation system. 

The pump stops when reaching the recommended inflation pressure that guarantees the quality of the installation. Hengdaanchor TM rock bolts can easily be pull tested at any time to control performance. The Hengdaanchor ® rock bolt is sealed at one extremity; the other extremity is equipped with a special head bushing used for inflation. The expansion of the bolt, inside the borehole, creates a friction and interlocking anchor, which provides full column support and support on the whole length of the borehole.

Due to this anchorage mechanism, the Hengdaanchor TM bolt can adapt to a wide variety of rock conditions and provides good to excellent anchorage capacity. The steel profile can adapt shear movements without failure.

The simplicity of the system can explain its performance. The operator simply drills a hole in the rock, inserts the bolt and then inflates it to a pre-determined pressure using a specially designed inflation system. The pump stops when reaching the recommended inflation pressure that guarantees the quality of the installation. Hengdaanchor TM rock bolts can easily be pull tested at any time to control performance.

1  Hengdaanchor ® net washer for screening

2  Bridges gaps in the rock

3  Allows major shear movements in medium to soft rocks

4  Adaptability to the bore hole's irregularity

5  A 50cm long inflated bolt can develop 100 kN friction

6  Friction and inter-locking support of the whole length 

Application:

Hengdaancho® rock bolts are extremely versatile and can be used in various tunneling and mining systems.

An application in tunneling is to use Hengdaancho® as pattern bolts to support an excavation. The bolting pattern depends on the size of the excavation and qualities of the rock mass.

In mining, common applications like roof and hanging wall bolting have adopted Hengdaancho® as a rapid, safe and high-performance device.

With various capacity ranges (110 kN, 160 kN, 240 kN) the Hengdaancho® rock bolts can be used in most reinforcement and support applications. They can also be used either in mines or in civil engineering applications, and their specific mechanical properties will provide the requested safety and performance.