33results about How to "Reduce the amount of excavation work" patented technology

The invention discloses a crushed surrounding rock ore downward drift layered sublevel-free tunnel filling mining method, the method comprises the following steps: adopting a mode of not setting a layered linking way, a sublevel tunnel and a pulse external ramp aiming at the special condition that the thickness of the inclined thin ore is less than 5m, adopting single tunnel drift type stoping when an accurate mining tunnel is arranged, determining the drift as a parallelogram; protecting an hanging wall surrounding rock and a footwall surrounding rock by adopting an anchor net cable joint support way; adopting underholing-free millisecond blasting technology for ore break down; computing the thickness of a filler bearing layer according to a built-in beam principle, differentially filling a gob, and adding a certain amount of complex early strength agent into the bearing layer material to fast setting and stabilizing the bearing layer. The tunnel arrangement is simplified, the construction difficulty is reduced, the drift tunnel excavating cost is lowered, the ore dilution rate and loss rate are reduced, and the safe and efficient production in the inclined thin ore exploitation process is realized.

The invention provides a kerve-free sublevel filling mining method. The kerve-free sublevel filling mining method specifically comprises the following steps: dividing sublevel chambers and splitting ore blocks, carrying out mining preparation and cutting engineering arrangement, carrying out kerve explosion, firstly carrying out extraction and filling operation of splitting ore blocks, carrying out extrusion groove explosion to form a cutting groove during extraction of adjacent ore blocks, utilizing a compensation space formed by extrusion explosion to carry out normal explosion extraction operation, after the extraction of a second splitting ore block, entering the next adjacent splitting ore block, forming the cutting groove through extrusion groove explosion, carrying out extraction, and cycling the extraction process of the adjacent ore blocks. Kerve-free explosion is adopted from the second splitting ore to form a stope cutting groove; compared with a normal cutting kerve method, the engineering of cutting a level and cutting a dooryard is eliminated, the operating time is reduced, the stope extraction period is reduced, the mining operation cost is reduced, the stope labor efficiency is improved, the method is suitable for mining ore deposits with poor stability of surrounding rock, and stope top base plate and hanging side surrounding rock collapse can be effectively controlled.

The invention discloses a buried tube heat exchanger for a small ground source heat pump, which relates to the technical field of heat pump devices. Aiming at the existing problem of large engineering volume, the following scheme is proposed, which includes fixedly connected hot water tanks and cold water tanks , the inner walls of the hot water tank and the cold water tank are fixedly connected with filter plates, the upper side of the hot water tank is fixedly connected with a water inlet pipe, the bottom of the hot water tank is fixedly connected with a discharge pipe, and the other side of the discharge pipe One end is fixedly connected with a plurality of first condensation pipes arranged in parallel, and the end of the first condensation pipe away from the discharge pipe is connected with a second condensation pipe and a connecting pipe through a tee, and the lower end of the second condensation pipe is fixedly connected with a communication pipe. Tube, the present invention is simple in structure, easy to use, can carry out heat exchanging function very well, reduces volume, reduces excavation engineering quantity, saves cost, controls flow at the same time, saves energy.

The invention discloses a super-short-wall coal mining method. According to the super-short-wall coal mining method, a special air returning roadway for mining small coal pillars at a mining area boundary being about 4m wide is connected with an air returning main roadway and a transportation main roadway; a mining machine at the lower part of the coal pillar is in orbital connection with one roadway so as to be simultaneously used for transporting and introducing air; the roadway is internally provided with a scraper plate conveyor, a reversed loader, a rail and a partial ventilator; a fully mechanized coal mining surface adopts a super-short machine body single-roller coal mining machine with a rocker arm in the middle of a machine body and a fully mechanized coal mining hydraulic bracket is improved; a flexible blower dryer is suspended below a top beam; an independent-head roadway is used for ventilating and the partial ventilator is matched to ventilate in a pressing-in manner. A goaf is treated by adopting a full caving method in a manner of arranging a remained gateway along goaf at the lower side of the goaf. On the basis of reasonably solving the basic problems of a transportation system, a ventilation system and a material transporting and recrement discharging system, the problem that the coal mining machine repeatedly passes through a fault when being used for cutting coal is avoided; the work amount of the roadway is reduced, the boundary coal can be flexibly recycled and the recovery rate is increased.

The invention discloses a close-range thin coal layer simultaneous mining and parallel transporting method, aiming to solve the problems caused by layer mining of the existing close-range thin coal layers, such as resource waste, serious flood, difficult mining distribution of lower layer coal, long mining period, low yield, high tunneling and supporting difficulties, high cost and the like. The method is characterized by arranging a centralized transport roadway, a centralized track roadway and a centralized air return roadway along the coal layers or top and bottom plates of the coal layers, simultaneously arranging two coal faces on the close-range thin coal layers and simultaneously mining and transporting coal. The method has the following beneficial effects: simultaneous mining and centralized transporting of the upper and lower coal layers are realized; relative to layer mining, by adopting the method, the tunneling quantities of the roadways are reduced, a belt conveyer can be simultaneously omitted, and the convenience is provided for centralized management of production; and especially for the close-range thin coal layers, the production system is simplified, the convenience is provided for centralized management, the production cost is lowered, and the mine output and the production efficiency are improved.

The invention relates to a support method for a top board in an underground coal mine, belonging to the technical field of mining technology and environment protection. The method comprises the following steps: acquiring an initial caving step pitch of an immediate roof of a working surface, an initial fracture step pitch of an upper roof, lithological characters and thicknesses of the immediate roof and the upper roof in the underground coal mine; according to the initial caving step pitch of the immediate roof, synchronously supporting the immediate roof of a goaf through anchor rods, anchorbeams and anchor cables during formation of the goaf; adopting an anchor cable group to support the upper roof through the immediate roof of the goaf when the unsupported roof distance of the goaf isless than the initial fracture step pitch range of the upper roof; and determining the model, the length and the inter-row space of the anchor cable group till finishing advancing of a working surface; as the working surface is advanced, keeping a crossheading in the working surface in the goaf in order to form passages for production, ventilation, transport, drainage and safety and till advancing of the working surface is finished. A forward-type coal mining method adopting the top board to support in the goaf of the underground coal mine has features such as no coal column and tunnel; a simple method; and easy operation. Additionally, the top board is controlled not to collapse.

The invention discloses an intelligent mining technology integrating mining, transportation, support and communication, which effectively reduces the excavation engineering volume of semi-coal and rock roadways by simplifying the layout of the working face, adopts double-drum coal cutters, scraper conveyors that can turn at right angles, and automatic loading and unloading Automatic equipment such as vertical support and telescopic air duct realizes unmanned working face mining with coordinated control of mining, transportation and support; compared with traditional mining, this method has the advantages of simple working face layout, low roadway excavation rate, high coal recovery rate, and equipment automation. High, safe and efficient intelligent mining and other characteristics, has broad prospects for promotion and application.

The invention discloses a slope ramp arrangement method applied to an overhand cut-and-fill mining method stope. The method comprises the following steps that when an ore body is stoped by an overhandcut-and-fill mining method, at one side of the stope, a returning type slope ramp is reversely and upwards dug from a lower horizontal middle section roadway; the slope ramp and each layer of the stope are communicated through short communication passages; the slope ramp is constructed section by section along with the rising of layered stoping of the stope until being communicated with the upperhorizontal middle section roadway; the slope ramp is used as the safe passage of the stope and a shovel conveyor transfer layer passage during the stope layered stoping; after the stope layered stoping is completed, the slope ramp is used as a main slope ramp between the upper horizontal middle section roadway and the lower horizontal middle section roadway. The digging and mining ratio is reduced; the nearest filling of the filling waste stone can be realized; important significance is realized for reducing the production cost and realizing the energy-saving environmental-friendly treatmentof the waste stone.