Top filling method for artificial pillar in goaf of mine

Abstract

The invention discloses a top filling method for an artificial pillar in a goaf of a mine, and the top filling method aims at the artificial pillar of a reinforced concrete structure. The method comprises the following specific steps that when the upper end of the artificial pillar of the concrete structure is poured to the position close to the final section of a roof plate, firstly, a pillar body template is prefabricated, a grouting pipe is reserved at the contact position of the top end of the template and the roof plate of the goaf, concrete is mechanically pumped into an inner cavity defined by the prefabricated template, and after the concrete is initially set for 7 days, through the reserved grouting pipe, the problem that an existing filling material cannot truly fill the gap between the top end of the artificial pillar and the roof plate is solved by adopting a high-pressure grouting mode. In addition, mechanical construction is adopted for the casting of a top filling section so that the construction quality can be ensured while the efficiency is high. In conclusion, the mechanical construction ensures the high operation efficiency and the construction quality, the high-pressure grouting enables the concrete material to fully fill the gap between the pillar body and the roof plate, so that full top filling of the artificial pillar and the roof plate is guaranteed, the artificial pillar really plays a supporting role, and the safety of the artificial pillar is improved.

Description

technical field [0001] The invention belongs to a method for connecting artificial ore pillars in goafs of mines. Background technique [0002] When constructing concrete artificial pillars in the goaf of a mine, the connection between the artificial pillar and the roof of the goaf is difficult to achieve the desired effect due to the limitation of construction conditions. The current treatment method is generally to insert small particles of waste rock at the periphery between the roof and the ore pillar, and the internal gap between the roof and the ore pillar is in a hollow state, which will directly affect the bearing capacity of the concrete ore pillar, and shotcrete is also used. Fill the gap between the roof and the ore pillar, but there will be insufficient filling inside, the bearing capacity of the ore pillar is still poor, and even cannot play an effective supporting role at all. Therefore, it has always been an unresolved problem to construct the roof connection...

AI Technical Summary

Problems solved by technology

[0002] When constructing concrete artificial pillars in the goaf of the mine, the connection between the artificial pillar and the roof of the goaf is difficult to achieve the expected effect due to the limitation of construction conditions.

The current treatment method is generally to stuff small particles of waste rock into the periphery between the roof and the ore pillar, and the internal gap between the roof and the ore pillar is in a hollow state, which will directly affect the bearing capacity of the concrete ore pillar, and the method of shotcrete is also used Fill the gap between the roof and the ore pillar, but there will be incomplete filling inside, the bearing capacity of the ore pillar is still poor, and even cannot play an effective supporting role at all

Images