Patent · US Active

Method of recovering room-and-pillar coal pillar by using external replacement supports

US11021954B2 · kind B2 · utility

0Cited by

4References

6Claims

0Family size

Assignee

China University of Mining and Technology · CN

Inventors

Nan Zhou · Beijing, CN
Hengfeng Liu · 安丰镇, CN
Meng Li · 安丰镇, CN
Zhongya Wu · 安丰镇, CN
Jixiong Zhang · 安丰镇, CN

Key dates

Filing date	Feb 22, 2019
Grant date	Jun 1, 2021
Priority date	—
Expiry date	Feb 22, 2039

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21D15/483
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A method of recovering a room-and-pillar coal pillar by using external replacement supports. In the recovery of a room-and-pillar coal pillar, a cement material wall is formed by performing pouring around a coal pillar having a width to height ratio of less than 0.6, by means of a single-pillar sack arrangement technique, such that a coal pillar resource may be mined while a wall made from a cement filling material supports an overlying stratum. After mining is complete, a coal pillar goaf region is filled with the cement filling material, and after the cement filling material solidifies and is stable, the single pillar can be recovered.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.