6results about How to "Reduce engineering construction costs" patented technology

The invention provides a reverse circulation PDC drill bit with detachable blades, which comprises a drill body, the drill body comprises a drill body, the top of the outer side surface of the drill body is provided with a shackle groove, and the top of the drill body is provided with a drill bit screw thread end; the multiple cutter wings are all arranged on the side face of the drill body, and the multiple cutter wings and the drill body are detachably installed; and the central water hole is formed in the drill body. According to the reverse circulation PDC drill bit with the detachable cutter wings, the drill body, the multiple cutter wings, the center water hole, the multiple drill bit water holes and other structures are matched with one another, during limestone drilling operation, the cutter wings and the drill body are detachably installed, when PDC teeth or gauge protection block teeth are abraded and damaged, the drill bit does not need to be overall disassembled, only the damaged cutter wings need to be independently disassembled for replacement, and the replacement cost is reduced. Therefore, the maintenance operation of the drill bit is simplified, the limestone drilling efficiency is improved, the overall service life of the drill bit is prolonged, and the engineering construction cost is reduced.

The application discloses a kind of offshore wind farm off-grid operation period operation and maintenance self-powered system starting method, for the problem of high cost of existing diesel generator or energy storage system as operation and maintenance system main power supply, through the coordination control of wind turbine generator unit and small capacity energy storage equipment, the smooth start of off-grid operation wind farm operation and maintenance system is realized, and after starting, wind turbine can be used as the main power supply of operation and maintenance system.Compared with the existing scheme, the present application can significantly reduce the construction cost, effectively solve the off-grid wind farm operation and maintenance system power supply problem caused by the different construction of offshore wind farm and land access system line, has significant economic benefits and good application prospect.

The invention is suitable for the field of hydraulic structure design of water conservancy and hydropower engineering, and provides a gravity dam economic section automatic design method and system based on an intelligent optimization algorithm, and the method comprises the steps: inputting design parameters, and initializing an algorithm population; performing stability calculation and constraint verification on each candidate section in the population; the candidate sections are evaluated through a preset fitness function, the function applies a great penalty value to the sections which do not meet the stability constraint, and the volumes of the sections which meet the constraint are directly used as fitness values; the population is iteratively evolved by using an intelligent optimization algorithm, and individuals with better fitness values are continuously screened out; and finally outputting an economic section which meets all safety constraints and has the minimum concrete volume. According to the method, a complex constrained engineering optimization problem is converted into an unconstrained optimization problem, automation and intellectualization of gravity dam section design are achieved, the design efficiency is greatly improved, and the engineering amount of a dam body can be remarkably reduced on the premise that safety is guaranteed.

The invention discloses a mortar-free modular prefabricated pedestrian pavement structure and a construction method thereof. The mortar-free modular prefabricated pedestrian pavement structure comprises a base layer; the grid layer is laid on the base layer and comprises a plurality of unit modules, each unit module comprises a plurality of transverse rib plates and a plurality of longitudinal rib plates which are arranged in the same direction, a plurality of longitudinal rib plates are connected between every two adjacent transverse rib plates, the transverse rib plates and the longitudinal rib plates define a plurality of meshes, each unit module is provided with two opposite adjacent sides, an insertion plate is formed on one adjacent side, and the insertion plate is inserted into the insertion plate. A socket notch is formed in the other adjacent side, the plug board on one adjacent side of the unit module is detachably inserted into the socket notch of the adjacent unit module, and the plug board is mounted on the base layer in a height-adjustable manner; the surface layer comprises a plurality of prefabricated panels, inserting columns are formed on the back faces of the prefabricated panels, the inserting columns are detachably inserted into the meshes of the unit modules, and the grid layer is supported on the prefabricated panels. The problems that according to an existing prefabricated pedestrian pavement structure, dust is raised when cement mortar is used, and the construction difficulty is high are solved.

This invention belongs to the field of DC grounding electrode technology, and specifically relates to a tree-shaped DC grounding electrode for smart grids and its design method. The technical solution is as follows: A tree-shaped DC grounding electrode for smart grids includes an electrode comprising a straight electrode trunk, several straight electrode branches located near the trunk, and an annular end electrode located near the other end of each straight electrode branch, with each branch corresponding to an annular end electrode; it also includes a central device or grounding electrode line terminal tower. The electrode is divided into several segments, each segment connected to a feeder cable, which is connected to the central device or grounding electrode line terminal tower via a conductor. This invention provides a tree-shaped DC grounding electrode for smart grids and its design method, ensuring the current discharge effect of the electrode while avoiding problems such as the need for large-scale demolition due to the surrounding of numerous buildings caused by the annular electrode arrangement.

The application provides an ultra-deep vertical shaft secondary conversion shaft mouth gangue discharging system and a gangue discharging method. The system comprises a conversion trestle; a concentrated gangue stacking area is formed at the bottom of the conversion trestle; a cage is arranged in the vertical shaft in a liftable manner; at least two tracks and a cross transition turnout are arranged on the conversion trestle, one end of the track corresponds to the entrance and exit of the cage, and the at least two tracks are communicated through the cross transition turnout; a gangue turning operation assembly is arranged at one end of the track running conversion assembly away from the cage and corresponds to the concentrated gangue stacking area; and a ground transfer assembly is arranged in the concentrated gangue stacking area and is used for gangue external transportation. In the application, the track is used for the running of the mine car, there is no long-distance ring track, the land occupation area is reduced, the compact field area is adapted, the empty mine car after discharging of the gangue can return to the original path or return to other tracks through the cross transition turnout; under the premise of not reducing the operation continuity of the mine car entering and exiting the cage, the running distance of the mine car is shortened, and the gangue turning and discharging efficiency is improved.