Ultra-large hole-diameter drilling shaft drilling method
A technology of aperture and shaft, which is applied in well sinking, shaft equipment, earth-moving drilling, etc., can solve the problems of frequent maintenance, low ventilation efficiency, and hanging air ducts occupying the space of construction equipment, so as to save the heating link, eliminate the Accumulation of harmful gas and good effect of underground climatic conditions
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[0040] Such as figure 1 As shown, the method of drilling and drilling shafts with extra-large apertures includes drilling, wellhead expansion and well neck construction, installation of equipment, construction of the wellbore foundation wall and installation of ballast transport equipment, reaming the well, and lining the well wall. Its characteristics are: The specific steps of the method are as follows:
[0041] (1) Drilling:
[0042] a. Use a drilling rig to drill 8 holes at a predetermined position, with a diameter of 700mm, which is connected to the underground connecting lane 12;
[0043] b. Use sprayed cement mortar to support the hole wall with a wall thickness of 30mm;
[0044] c. Install a high-strength protective hole wear-resistant tube 9 in the drilled hole;
[0045] (2) Wellhead expansion and well neck 4 construction:
[0046] a. Strip the topsoil at the wellhead;
[0047] b. Wellhead lock and neck 4 construction;
[0048] c. Fengdong Airway 18 construction;
[0049] (3) Ins...
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