Five advantages of using self drilling anchor bolts
by Anna S. Optimization SpecialistThe use of common hollow anchor bolts, rebar and casing construction, and
other supporting methods are widely used, but in recent years, self-drilling
anchor bolts have become more and more favored by construction parties.
What is the reason? Today I will give you a brief introduction to the
advantages of self-drilling anchor bolts.
1. Strong applicability: hollow anchor bar can be
connected with a variety of drill bits for drilling. The drill bits include EX
drill bits, EXX drill bits, ESF drill bits, ESSF drill bits, clay drill
bits, etc. Different types of drill bits can be selected for different
geological conditions, and a hollow anchor bar with different
diameters can be matched with drill bits of different specifications.
2. High construction efficiency: construction process
of common hollow bolts is: drill the hole-withdraw the drill pipe-insert the
bolt-connect the grouting machine and grout, while the self-drilling anchor
bolts realize drilling and grouting integration with anchoring function greatly
improves construction efficiency. According to project statistics, the drilling
efficiency of the latter can achieve a shift of 130-250m, depending on
different geological conditions.
3. Simple structure: It is composed of a hollow anchor bar, drill bit,
coupler, nut, and centralizer. The structure is relatively simple but
constructed when connected with a drilling rig and a grouting machine. In
addition to installing, connecting the long self-drilling bolt, and operating
the grouting machine, the number of personnel required for the construction is
less, which saves labor costs.
4. Uniform grouting thickness and good anchoring effect: the centralizer is
to ensure the anchor bar is always at the center of the hole during drilling,
and the cement grout thickness around the rod keeps at least 20mm. If the
anchor rod is not centered, the grout thickness along the anchor rod will be
biased, resulting in an uneven force of the anchor body, which will affect the
anchoring effect.
5. Low requirements for construction conditions: It has drilling anchor bolts that have realized
the integration of drilling, grouting, and anchoring functions, and can be
constructed normally on various working platforms, especially in relatively
narrow tunnels, underground, etc. In the space, self-drilling anchor bolts can
still be constructed normally, which is impossible for ordinary anchors.
Through the above introduction, I hope everyone has a fuller
understanding of the advantages of self-drilling anchor bolts. If you encounter
problems during construction, please contact Sinorock, our technical team will
provide you with customized system solutions to help you solve problems.
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Created on Oct 26th 2021 04:12. Viewed 223 times.