Self drilling anchor bolts--An ideal solution for weak soil
by Anchor S. Web DesignerIn the field of geotechnical engineering,
there are complex geological conditions such as weak rock and soil layers,
fault fracture zones, and easily collapse geology, which brings great
difficulties to engineering construction. Self-drilling anchor bolt integrates
the functions of drilling, grouting, and anchoring together. The construction
process of simultaneously drilling and grouting is
the best solution for loose and weak formations.
Self-drilling anchor bolt is mainly composed
of hollow anchor bar, nut, plate, coupler, centralizer, and drill bit. The hollow anchor bar has continuous thread along the full
length, thus it can be cut at any position; the thread profile of the hollow
bar conforms to international standards, and can be connected with different
drilling rigs and accessories. The drill bit is a very important part of the
system. The quality of drill bits determines drilling efficiency. After years
of research, Sinorock R&D team has continuously optimized the design
structure according to actual project data, so that the drilling quality can be
ensured during the service life. When choosing a drill bit, the customer can
choose the most suitable drill bit according to geological conditions, so as to
maximally save costs under the premise of ensuring construction quality.
Self-drilling anchor bolts are the best
solution for weak formations. They are widely used in slope engineering, ground
and foundation engineering, tunnel and underground engineering. They can be
used for pre-construction support and can effectively enhance the stability of
soil and rock mass.
For the support of weak ground, the self-drilling anchor bolt construction technology has the main advantages as
follows.
n Hollow anchor bar can work as both drill rod and anchor rod, which
reduces the two construction steps of retracting drill rod and inserting anchor
rod. It simplifies the construction process and effectively improves construction efficiency.
n Self-drilling anchor bolt can be drilled without casing when
drilling in soft formations, thus it can greatly improve construction
efficiency, shorten the construction period and reduce engineering costs.
n Hollow anchor bar has continuous thread along the full length, which
can be cut at the construction site according to the actual situation and can be
extended with a coupler, which is especially suitable for limited access.
n Simultaneously drilling and grouting, the cement grout can be fully
filled and penetrated into the surrounding rock and soil to form a uniform
filter cake with higher bonding strength.
n Rotary percussion drilling method not only drills efficiently but
also ensures good directional stability of the drill rod.
As an effective
construction technology, self-drilling anchor bolts have been widely used in
various engineering projects, especially in special geology such as soft soil
layers and easily collapse conditions. It is the best solution for weak soil.
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Created on Aug 25th 2021 03:04. Viewed 220 times.