2results about How to "Prevent hole collapse" patented technology

This invention discloses an integrated device for in-situ power generation and extraction of coal seam gas and its usage method, relating to the field of coal seam gas control and utilization technology. An underground in-situ installation mechanism is used for anchoring coal seam boreholes and includes a gas storage chamber. A gas pretreatment mechanism is located inside, performing multi-stage purification of the raw gas entering the storage chamber. An outlet pipe connects to the storage chamber. A first negative pressure generating mechanism is detachably connected to the outlet pipe, generating negative pressure in the storage chamber in a first operating mode. A mechanical extraction mechanism can replace the first negative pressure generating mechanism, switching to a second operating mode. A bidirectional electrochemical energy conversion mechanism is connected to the underground in-situ installation mechanism and the storage chamber; in the first operating mode, it generates electricity using high-concentration gas, and in the second operating mode, it produces methane using electrical energy. An integrated control system is electrically connected to each mechanism, coordinating operation according to a preset program or remote commands to achieve switching between the two operating modes and stable operation. This invention enables the coordinated operation of in-situ collection, power generation, and extraction of coal seam gas.

The utility model relates to an assembly type slide-resistant pile steel retaining wall structure which is formed by vertically connecting a plurality of sections of prefabricated sub retaining walls, and is characterized in that each section of sub retaining wall is of a rectangular structure formed by connecting four steel plates; the upper and lower adjacent sub protection walls are connected together through the anchor bolt holes and anchor bolts in an embedded manner; two I-shaped steel beams are welded on each side of the inner part of each section of sub protection wall at equal intervals in the height direction; twisted steel bars are transversely welded between the steel plate and the I-shaped steel beam at equal intervals in an oblique angle manner. The structure is reliable, construction is easy, the overall structural rigidity and stability are improved while the budget of the I-shaped steel beam is reduced, damage to a protection wall caused by in-hole soil pressure changes which are influenced by external factors is effectively avoided, and the hole collapse phenomenon is avoided.