4results about How to "Avoid mud" patented technology

The invention provides a subway station main body foundation pit structure in a complex environment and a construction method, and belongs to the technical field of subway station main body foundation pit structures. The subway station main body foundation pit structure structurally comprises a main body foundation pit formed in the complex environment of a three-face-ring building and a one-face-ring hillside, and a foundation pit structure is arranged in the main body foundation pit; the foundation pit structure comprises a pit edge base platform structure poured on the peripheral edge of the pit bottom of a foundation pit body, a plurality of water collecting pits are formed in the four corners of the inner side of the pit edge base platform structure, a pit-in-pit base platform structure is poured in the middle of the pit bottom of the foundation pit body, and a plurality of foundation pit side wall structures are poured on the top face of the pit edge base platform structure in the direction corresponding to a three-face ring building. And a water diversion filling layer structure is backfilled in the water accumulation prevention inclined pit in a layered non-tamping manner, so that the transverse extrusion stress on an outer drainage wall structure is reduced, and the problems that in the prior art, the side wall of the foundation pit structure is transversely extruded by soil-water pressure, and the side wall of the foundation pit structure is prone to water seepage and cracking are effectively solved.

This invention provides a grouped self-cleaning aeration and fluidization system, relating to the field of wastewater treatment aeration technology. It includes: a dissolved oxygen sensor, an intelligent control box, a blower, and grouped aeration modules. The intelligent control box includes a power distribution module, a control and protection module, a PLC control module, a cloud-based IoT gateway module, and a data acquisition module. The grouped aeration modules include multiple aeration units; each aeration unit includes multiple independent microporous hoses, hose fixing brackets, and butterfly valves. The dissolved oxygen sensor is connected to the PLC control module. The PLC control module, blower, and grouped aeration modules are connected sequentially. The PLC control module is connected to the butterfly valves. The PLC control module controls the opening and closing of the butterfly valves, performing self-cleaning and starting / stopping the grouped aeration modules. This invention can form directional water flow, achieving full-pool aeration and fluidization, preventing sludge accumulation at the bottom of the pool, and improving sludge suspension and oxygen transfer efficiency.

The invention provides a dust suppressant for a coal mine strip mine tunnel and a use method of the dust suppressant, and relates to the technical field of mine dust prevention and control. The dust suppressant is prepared from the following raw materials in percentage by mass: 18-43% of a humectant, 0.04-0.3% of a surfactant, 0.1-0.3% of a crusting agent, 1% of a preservative and the balance of water, wherein the total mass of the raw materials is 100%. The additive amount of each component in the formula is clear, the production process is simple, a large amount of water supply equipment is not needed during construction, the method can directly adapt to the existing operation conditions of a mine field, and large-scale popularization is facilitated.

This utility model discloses a modular, configurable curtain-type MBR pulse aeration structure, including two end members and at least one aeration member disposed between the two end members. The two end members and the at least one aeration member are detachably connected by a tenon and mortise structure to form an aeration structure body. The aeration structure body has an inner cavity with a lower opening and a surrounding inner circumferential wall. The upper end of the surrounding inner circumferential wall is connected to the top wall of the inner cavity and is shorter than the circumferential wall of the inner cavity, dividing the inner cavity into an air inlet chamber and an aeration chamber. This utility model adopts a modular, configurable design. By combining different numbers of aeration members, the length of the aeration structure can be flexibly adjusted to adapt to curtain-type MBR membrane modules of various sizes, completely solving the installation difficulties caused by the fixed size of existing aerators.