Characteristics & Advantages of Self-drilling Rock Bolts in Tunnel Support
A tunnel is a construction that is built underground, underwater, or
in the mountain by laying a railway or highway to let motor vehicles pass
through. Based on the site selection, the tunnel is divided into the mountain
tunnel, submerged tunnel, and city tunnel. Because of the specificity of the
location, its exploration and digging must be based on the surrounding terrain,
geology, and the distribution of the underwater. To ensure the traffic capacity
is smooth, we should reinforce and advance the pre-support of the tunnel when
digging it.
Luoyang Sinorock Engineering Material Co., Ltd. is specialized in
the development, production, and sales of anchoring products. The bolt
productions in our company insist on being safe, efficient, energy-saving, and environmentally
friendly, and we will provide one-stop service, integral solution, and quality
guarantee.
When the tunnel is built in the terrain or the surrounding of broken
rock, loose soil layer, and difficult to drill, the self-drilling anchor bolt
can combine drilling, grouting, and anchoring into one step without casing pipe
and drilling pipe, and then ensure the anchoring effort in the complicated
geological condition. It owns the features of convenience, reliability, and
high- efficiency.
What’s more, there are some other advantages when using
self-drilling rock bolts in tunnel support.
1. Self-drilling anchor bolt system, which combines drilling,
grouting, and anchoring together, is suitable for broken rock and conditions
which are difficult to drill holes. Casing pipe is omitted in construction,
which greatly improves construction efficiency.
2. Self-drilling anchor bolt system has a rich variety of drill
bits, and the drill bit can be selected according to the properties of rock and
soil, which can improve the drilling efficiency.
3. Self-drilling anchor bolt system can fill cracks, consolidate
rock mass and soil layer through pressure grouting, and has good grouting
spreading radius and reliable anchoring quality.
4. The hollow anchor bar can be cut arbitrarily and lengthened by
the coupler. Therefore, the self-drilling anchor bolt is suitable for
construction in a narrow space that large equipment cannot enter.
When the tunnel is influenced by the underwater, seawater or the
chemical mediator, duplex coating rock bolt can come into play. This kind of
production combines two different protecting ways together: hot-dip galvanizing
and epoxy coating. Hot-dip galvanizing involves dipping the article with a
chemically clean surface into a bath of molten zinc which reacts with the iron
and forms a coating, and to prevent rusting; Epoxy coating doesn’t react with
acid, or alkali. It has good chemical stability, ductility, and small dry shrinkage.
And it can separate water, oxygen, chloride, and other corrosive media.
Meanwhile, it also creates an electric insulation layer that can insulate the
electric current between the steel bar and outside conditions, which can reach
a good result in corrosion prevention.
Under the circumstance of weak and broken rocks, to prevent tunnel
collapse, and rock deformation, and to ensure construction quality and the
safety of workers, large- diameter pipe shed method is an ideal tool for
supporting. Except for the basic parts: nut, coupler, drill bit, it has also
the key parts: pipe shed body and domed plate.
In addition, the friction bolts can increase the contact area of the
steel tube and the rock layer, which has a larger pulling-out force.
In a word, based on the different geological conditions, our company
develops and makes different anchor bolt productions to reach the best effort
and afford our customers the best one-stop service.
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