A safe haven wall for use in defining a safe haven in an underground mine comprising a lower section and an upper section, wherein said upper section is slidingly engaged to the lower section.

A safe haven wall for use in defining a safe haven in an underground mine comprising a lower section and an upper section, wherein said upper section is slidingly engaged to the lower section.

Disclosed are a fireproof material, a fireproof plate, a fireproof wall structure for tunnels and a construction method. The fireproof material includes the following components in weight ratio: 20-35 parts of aluminosilicate; 10-25 parts of calcium carbonate; 5-15 parts of magnesium oxide; 5-15 parts of silica; 20-40 parts of a binder; and 5-10 parts of a curing agent, the binder includes at least one of lithium silicate, potassium silicate and sodium silicate in combination with at least one of quartz sand and industrial sugar; and the curing agent is at least one of lithium oxide and magnesium oxide. In the preparation, firstly forming the mixture of aluminosilicate, magnesium oxide and silica into particles at 900° C.-1250° C., and then mixing the particles with calcium carbonate, the binder and the curing agent, and then pouring same into a forming mold and heating and pressing to form the fireproof material.

A jack for installing a mine stopping panel includes an extendible post and a press for extending the extendible post. The press can have a lever movable between an actuated position and a non-actuated position and operative to extend the post as it moves toward the actuated position and retract the post as it moves toward the non-actuated position. A yieldable biaser yields when the post is extended to extend the mine stopping panel and the mine stopping panel engages a mine surface with sufficient force to crush a stopping seal and anchor the stopping panel. The press can comprise an over-center toggle linkage.

A jack for installing a mine stopping panel includes an extendible post and a press for extending the extendible post. The press can have a lever movable between an actuated position and a non-actuated position and operative to extend the post as it moves toward the actuated position and retract the post as it moves toward the non-actuated position. A yieldable biaser yields when the post is extended to extend the mine stopping panel and the mine stopping panel engages a mine surface with sufficient force to crush a stopping seal and anchor the stopping panel. The press can comprise an over-center toggle linkage.

A device for integrated control of acid wastewater plugging and discharging of an abandoned mine includes an airtight wall, a central controller, a CO.sub.2 gas source, an agent bucket, a siphon pipe I and a liquid storage bucket are arranged on the outer side of the airtight wall, and a plurality of monitoring sensors are arranged in the inner side of the airtight wall, and the monitoring sensors are electrically connected to the central controller; and a flood discharge valve is arranged at the bottom of the airtight wall. The device is miniaturized and operates for a long time with low power consumption, thereby achieving long-term unattended operation and maintenance.

A device for integrated control of acid wastewater plugging and discharging of an abandoned mine includes an airtight wall, a central controller, a CO.sub.2 gas source, an agent bucket, a siphon pipe I and a liquid storage bucket are arranged on the outer side of the airtight wall, and a plurality of monitoring sensors are arranged in the inner side of the airtight wall, and the monitoring sensors are electrically connected to the central controller; and a flood discharge valve is arranged at the bottom of the airtight wall. The device is miniaturized and operates for a long time with low power consumption, thereby achieving long-term unattended operation and maintenance.

A jack for installing a mine stopping panel includes an extendible post and a press for extending the extendible post. The press can have a lever movable between an actuated position and a non-actuated position and operative to extend the post as it moves toward the actuated position and retract the post as it moves toward the non-actuated position. A yieldable biaser yields when the post is extended to extend the mine stopping panel and the mine stopping panel engages a mine surface with sufficient force to crush a stopping seal and anchor the stopping panel. The press can comprise an over-center toggle linkage.

A jack for installing a mine stopping panel includes an extendible post and a press for extending the extendible post. The press can have a lever movable between an actuated position and a non-actuated position and operative to extend the post as it moves toward the actuated position and retract the post as it moves toward the non-actuated position. A yieldable biaser yields when the post is extended to extend the mine stopping panel and the mine stopping panel engages a mine surface with sufficient force to crush a stopping seal and anchor the stopping panel. The press can comprise an over-center toggle linkage.

A wall construction system including plurality of interlocking concrete blocks. The interlocking blocks include one or more stretcher blocks, corner blocks, and half blocks. The blocks include top and end shear lugs and bottom and end grooves. The bottom grooves accommodate the top shear lugs of blocks in a lower course of stacked blocks. Corner blocks provide a means for creating a corner and turning the direction of a course of blocks by 90 degrees. The interlocking features of the blocks enable dry-stacking in successive courses to construct a wall or multi-wall structure. When stacked end to end in successive rows, the top and end shear lugs of each interlocking block engage complimentary grooves in the underlying, overlying, and adjacent blocks thereby enabling the blocks to rapidly self-align vertically and lock together as they are stacked. The resulting dry-stacked structure exhibits a high lateral resistance to overpressures or transverse loads.