A high-efficiency coring method for portable drilling rigs in intact hard rock
A portable and drilling rig technology, which is applied in the fields of earth drilling, undisturbed core extraction, construction, etc. It can solve the problems of low coring rate and fast wear of drill bits, achieve high reuse rate, strong pertinence, and improve the success of trapping rate effect
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[0028] To make the content of the present invention more obvious and understandable, the following is attached figure 1 -Attached Figure 4 And the specific implementation is further described.
[0029] An efficient core-taking method for a portable drilling rig in a complete hard rock of the present invention includes the following steps:
[0030] a. In the shallow layer of the surface where the core is to be taken, drill a blind hole with a drill to remove the broken core in the blind hole; the depth of the blind hole is 80-100 cm.
[0031] b. Lengthen the drill rod on the drilling rig described in step a, and continue drilling to the lower layer on the basis of the blind hole; stop drilling when the hollow drill bit at the end of the drill rod is filled with a complete core;
[0032] c. Lift the drill rod in step b slightly upwards, leaving a 0.5-1cm gap between the inner wall of the hollow drill bit and the core;
[0033] d. Insert the filler from the top hole of the drill rod into...
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