Strong roof support pier column and method for protecting section coal pillar
A technology of roof support and piers, which is applied in the direction of pillars/brackets, earthwork drilling, mining equipment, etc., can solve the problems of difficult construction of the roof support body on the side of the coal pillar, poor pressure performance, unsafe recovery, etc. , to achieve the effect of short construction time, simple construction and low labor intensity
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[0028] The strong roof supporting pier column is composed of pier column forming structure, suspenders, fixed hooks, square wood and bag filling materials; there are injection ports on the upper outer wall of the construction bag; the top of the inner bag 1 is provided with 6 circles with a diameter of 3 cm The vent hole 11 is used for venting the air inside the bag when filling with concrete; 4 steel fixed hooks 7 are arranged at equal intervals on the top of the outer bag 2 and the fixed hooks 7 are connected to the outer bag through a height-adjustable sling 8. Before filling, the construction belt is hung under the reinforced mesh of the roof; there is an injection port 9 on the outer wall of the upper part of the construction bag. The injection port is cylindrical with a diameter of 0.2m.
[0029] The pier column forming structure, namely the construction bag, includes: an inner bag, an outer bag, a base bag, a cast iron base, and a circular steel hoop to increase the strengt...
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