Ground pre-grouting method for small-section high shaft in complex stratum
A complex formation, pre-grouting technology, applied in well sinking, shaft equipment, earth-moving drilling, etc., can solve the problems of difficult seating, risk of water production, and easy to return to the wellbore, so as to reduce the waste of slurry and reduce the difficulty. , Guarantee the effect of grouting quality
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[0060] The ground pre-grouting method for small and high shafts in complex formations in this embodiment includes the following steps:
[0061] (1) Complete the grouting work of surface soil section solid pipe, AB section and CD section according to the method in the prior art, and complete the large section grouting operation of BC section, BC section is the complex stratum of broken zone; A is the grouting starting point B is the starting point of the broken zone, C is the ending point of the broken zone, and D is the ending point of grouting.
[0062] The topsoil section can adopt the full straight grouting drilling method or the S-type grouting drilling method.
[0063] This embodiment adopts the full straight grouting drilling method, A is the starting point of grouting, B is the starting point of the broken zone, C is the ending point of the broken zone, and D is the ending point of grouting. The height from the ground to the grouting starting point A is the surface soi...
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