33results about How to "Avoid secondary perturbation" patented technology

The invention discloses a zero spacing construction technical method for an intersecting and overlapping part of an upper main tunnel and a lower main tunnel of an underground overpass, which belongs to construction technologies of tunnel engineering. The method comprises four procedure steps of: (1) excavating and supporting an upper-layer tunnel CRD (cross diaphragm) and strengthening the construction of reinforced concrete edge beams; (2) excavating and supporting a base pit of a lower-layer tunnel; (3) carrying out secondary lining construction outside the lower-layer tunnel; and (4) refilling the upper part of the secondary lining outside the lower-layer tunnel. The invention realizes the technical method which does not retain soil mass at the intersecting and overlapping part of the upper-layer main tunnel and the lower-layer main tunnel of the underground overpass and finishes the construction of the excavation and the support structure of the upper main tunnel and the lower main tunnel of an intersecting section in one step and solves the problems of structure influence to early built tunnel by the late built tunnel and the secondary disturbance to the ambient soil mass which are caused by the upper penetration or lower penetration due to the early and late construction of the upper main tunnel and the lower main tunnel.

The invention relates to a frequency support control method used for a doubly-fed wind generation set and based on two-stage power tracking optimization. The invention starts from optimization of frequency support dynamic characteristics of a wind generation set and provides a frequency support control method used for the wind generation set and based on two-stage variable proportion coefficient optimized power tracking. On the basis, a variable proportion coefficient control strategy in an inertial response stage is derived based on a virtual inertia time coefficient and a rotor movement equation, and for quick recovery of a maximum power tracking operation mode of the wind generation set after inertial support and avoiding secondary disturbance from being produced on system frequency adjustment in a recovery process, a variable proportion coefficient control strategy in a maximum power tracking operation mode recovery stage is designed by adopting fussy control. The frequency supportcontrol method provided by the invention has control robustness, a control structure is simple, engineering implementation is easy, and the quick recovery of the maximum power tracking operation modeof the doubly-fed wind generation set after inertial response and inertial support on a power grid frequency can be realized.

The invention relates to a frequency modulation method of a wind storage system based on double-layer cooperative control, and provides a two-layer cooperative control scheme for providing frequency modulation response for a flywheel energy storage cooperative MPPT operation wind turbine generator based on a cooperative control theory by starting from optimization of frequency response dynamic characteristics of the wind storage system. The frequency deviation and the virtual electrical inertia of the wind turbine generator are linearly combined to form a macro variable, and a variable proportion coefficient speed regulation strategy for cooperatively providing frequency support for the wind turbine generators with different wind speeds is designed. Further, based on the linear combinationof the frequency deviation, the energy storage frequency modulation power instruction and the virtual inertia of the wind turbine generator, a macro variable is formed, and an additional frequency modulation active adjustment strategy that flywheel energy storage cooperates with the wind turbine generator to provide frequency support, rapidly recover MPPT operation of the wind turbine generator and avoid frequency secondary disturbance is designed. The method is good in robustness, simple in control structure and easy to implement in engineering, the frequency modulation response effect of the wind storage system on the power grid can be achieved, and the active adjustment speed requirement of the synchronous generator participating in frequency modulation is lowered.

The invention discloses a preparation device of a saturated remolded clay cutting ring sample and an application method thereof, which belong to the field of geotechnical test research. The preparation device mainly comprises a sampling cylinder, a cutting ring, a loading mechanism and a water channel. The sampling barrel is a half-and-half cylinder; two cylinder sheets are assembled through a clamp hoop. During a jointing part of the cylinder sheets, a groove is formed in the side face of the cylinder sheet on one side, and a rubber strip is arranged in the groove, so that a joint is ensuredto be impermeable after being jointed. A cutting ring positioning slot is formed in an inner wall of the sampling cylinder and can be used for placing multiple cutting rings; a backing ring is arranged between each two adjacent cutting rings. A drainage hole is formed in the lower part of the sampling cylinder, and is internally and sequentially provided with permeable stones, filter paper, mud, filter paper, permeable stones and a pressurizing plate; the pressurizing plate is provided with a through hole. The sampling cylinder is placed in the water channel, and water covers the sampling cylinder. The loading mechanism utilizes a lever for pressurizing the pressurizing plate. The device can be used for preparing multiple saturated remolded clay cutting ring samples with different sizes atone time, and is fast and high-efficient.

The invention discloses an extra-thick coal seam strip-type filling and mining method relying on steel mould trolleys. The extra-thick seam strip-type filling and mining method is used for 'three-under' extra-thick coal seam mining. After coal seam mining, an upper layer hard roof forms a cantilever plate structure, under the cover of the stable cantilever structure, a row of steel mould trolleys arranged parallel to the stope face jointly form a strip filling template to fill a goaf closely adjacent to the stope face. According to the extra-thick coal seam strip-type filling and mining method, the traditional steel mould trolley for tunnel lining is modified, the construction technology is simplified, the planned filling space of the goaf is filled at full height at one time, and false roof laying of slicing filling is avoided; a partition wall is not needed to be constructed, partial filling can be achieved, and filling materials are saved; a mode of combining filling and mining is adopted, filling and mining are pushed forwards simultaneously, coal pillars are not needed to be reserved and arranged, secondary disturbance caused by recovering the coal pillars is avoided, the subsidence of an overlying rock is strictly controlled, and the safety of ground buildings is ensured; and standardized and high modular steel mould trolleys are selected, and can be adapted to filling spaces with various sections and reused.

The invention discloses a portable soil body in-situ density tester which comprises five parts, namely power equipment, soil sampling equipment, a bulldozing structure, a weighing instrument and a base; the power equipment is divided into a lifting device and a pressing device; the pressing device adopts a jack mechanism capable of being inverted; the lifting device is of a small gear structure, and the structure comprises five parts of a transmission gear, a transmission rack, a hand-cranking handle, a transmission rack support and a supporting frame. The portable soil body in-situ density tester has the advantages that the in-situ density of the soil body is measured, the test principle is clear, the structure is simple, the test steps are few, the speed for penetrating into a soil layerfor soil sampling and the lifting speed after sampling can be freely controlled, the soil sampling efficiency is high, and the detection time is shortened; the adopted instrument is small in size, does not need an external power supply and is convenient to carry, the average natural density of the taken soil sample is directly measured, and the taken soil sample is pushed out after the test is finished, so that secondary disturbance of the test is avoided, and the accuracy of a density test result is improved.

The invention relates to an electric vehicle and temperature control load polymer response-based frequency synergic control method. The electric vehicle and temperature control load polymer response-based frequency synergic control method comprises the following steps of identifying response demand DP of a power system, and determining a current controllable electric vehicle in a grid, a temperature control load and working states thereof; building a controllable domain of a single electric vehicle and a hot pump, and calculating an electric vehicle state label SOB and a hot pump state label SOT; calculating a polymer parameter of a load; calculating required total power change quantity DPR0<EV> and DPR0<HP> of the vehicle and the hot pump when parameters R<EV> and R<HP> becomes 0; calculating alternative values of an adjustment signal DP<EV> issued to the electric vehicle and an adjustment signal DP<HP> issued to the hot pump; and verifying whether the alternative values of the DP<EV>and the DP<HP> exceed a frequency adjustment capability range of the polymer, correcting the alternative values if yes, determining final values of the DP<EV> and the DP<HP>, and generating the finalvalues in the electric vehicle polymer and the temperature control load polymer.

The invention discloses an overlaid soil sample preparation device and a use method thereof, and belongs to the field of geotechnical experiment research. The device mainly comprises a plurality of overlaid basic units, and each basic unit sequentially comprises a supporting ring, a permeable stone, a cutting ring and a backing ring from bottom to top. All the basic units are connected in series through supporting rods and placed into a water tank, and each basic unit can manufacture one soil sample. The backing rings are made of rubber, and steel wire rings are placed into the backing rings.The diameter of each steel wire ring in the backing rings is firstly decreased and then increased from bottom to top. Water in the water tank submerges the upper surface of a compression plate. A plurality of saturated remodeled cohesive soil cutting ring samples can be prepared once rapidly and efficiently by the device.

The invention discloses a side slope green covering structure, which includes a blocking plate, a side slope and seeds. The surface of the side slope is paved with a soil covering layer, the lower endof the blocking plate is inserted into the soil covering layer, the lower end of the blocking plate is transversely inserted into the soil covering layer along the surface of the side slope, the blocking plate is perpendicular to the slope surface of the side slope, the surface, facing the slope top of the side slope, of the blocking plate is a concave cambered surface, and the seed are planted in the concave cambered surface and located at the junction of the concave cambered surface of the blocking plate and the soil covering layer. The invention further discloses a planting method for sideslope green covering. By adopting the side slope green covering structure, the seeds are sown in the concave cambered surface of the blocking plate, and then covered with soil. According to the sideslope green covering structure and the planting method, the covering soil of the side slope and the seeds can be prevented from sliding, and the problems of uneven coverage degree, the bald slope andthe like after side slope green covering are solved.

The invention discloses a soil sample preparation device and a using method thereof, belonging to the field of soil engineering experiment research. It mainly includes sample preparation cylinder, ring knife and base plate. The sample preparation cylinder is a half-type cylinder, and the two cylinder pieces are assembled together by a clamp. At the splicing of the tube pieces, there is a groove on the side of the tube piece on one side, and there is a rubber strip in the groove, which can ensure that the seam is tightly bonded after splicing. The inner wall of the sample preparation cylinder is provided with a ring knife positioning groove, a plurality of ring knives can be placed in the ring knife positioning groove, and there are backing rings between adjacent ring knives. The device can prepare multiple ring knife samples at one time, which is fast and efficient.

The invention relates to a resistance buffer device for rockfall prevention, which is characterized by comprising a flexible steel wire mesh enclosure, multiple steel ring fasteners, parachute cords, a drag parachute sleeve, steel stranded wires, steel wires, a drag parachute and expansion bolts, wherein two ends of the flexible steel wire mesh enclosure are connected with one ends of the steel stranded wires respectively; the multiple steel ring fasteners are arranged on the edge of the drag parachute and are connected with one ends of the parachute cords respectively; the other ends of the parachute cords are connected with the other ends of the corresponding steel stranded wires through the steel ring fasteners; the drag parachute is accommodated in the drag parachute sleeve; the top end of the drag parachute sleeve is connected with a steel wire rope with one fixed end; the flexible steel wire mesh enclosure is fixed at two ends of a dangerous rock through the expansion bolts. The resistance buffer device is reliably, conveniently and rapidly used for preventing rockfall from falling or rolling at a high speed and more powerfully provides safeguard for life and property security of people.

The invention discloses a pipe-jacking three-points-and-one-line construction method. The method comprises the steps of 1, conducting construction preparation and tool allocation; 2, excavating a pipe-jacking well, and constructing surrounding enclosing shelters; 3, determining central points of the two sides of a wall of the pipe-jacking well, and connecting the central points to form a line; 4, picking three points on the connection line, projecting the three points into the pipe-jacking well, and connecting the three points into a projection line; 5, guiding the projection line into a pipe-jacking pipeline through a laser snapline instrument; and 6, conducting pipe-jacking construction. According to the pipe-jacking three-points-and-one-line construction method, the straight line is determined through two pipe wells; the three points on the straight line are picked and projected into the pipe-jacking well; the projected three points form a straight line; and a longitudinal line of a cross line obtained through projection conducted through the laser snapline instrument coincides with the projection line, a transverse line coincides with a pipe-jacking left quadrantal point and a pipe-jacking right quadrantal point, and the midpoint of the cross line coincides with the midpoint of the pipe-jacking pipeline. By means of the pipe-jacking three-points-and-one-line construction method, it is guaranteed that a pipe-jacking construction route is correct; the jacked pipe is prevented from being shifted in the ingress process; and pipe-jacking construction precision is improved.

The present invention relates to a sample preparation device and a sample preparation method for preparing a sample for a geotechnical true triaxial test, the sample preparation device comprises a bearing platform, a consolidation device and a loading device for applying a downward pressure to the top of the consolidation device in a vertical direction, the consolidation device comprises a drainage base, at least two screws, a sample preparation frame, an auxiliary frame, a latex film, a lower permeable plate, first filter paper, an upper permeable plate, second filter paper and a pressure plate, an exhaust pipe is arranged on the side wall of the sample preparation frame, a first drainage pipe is arranged on the drainage base, and a second drainage pipe is arranged on the pressure plate; and the cross sections of the fixing groove, the inner cavity of the sample preparation frame and the inner cavity of the auxiliary frame are regular polygons or rectangles. A cubic remolded sample is prepared by using a slurry consolidation method, and the drainage volume is controlled through top pressure and the valve so that the density and the water content of the remolded sample are controlled; the whole sample preparation process is simple and easy to implement, and the sample preparation device is scientific, simple, convenient, high in operability and high in economic practicability.

The invention discloses a refuse dump platform structure. The refuse dump platform structure comprises a platform layer, an earthing layer and blocking plates, grooves are formed in the surface of theplatform layer and matched with the blocking plates, the lower portions of the blocking plates are inserted into the grooves, the blocking plates are parallel to the edge of the platform layer, the earthing layer is arranged above the platform layer, the upper edges of the blocking plates are flush with the surface of the earthing layer or the upper edges of the blocking plates are arranged abovethe surface of the earthing layer, and plants are planted in the earthing layer. According to the refuse dump platform structure and the refuse dump platform greening method, the platform greening isuniform, plants root easily, water and soil loss is not likely to happen, the rainwater utilization rate is high, the side slope and the platform below can be prevented from being eroded, and excessive earthwork does not need to be consumed.

The invention discloses a preparation method for a glue-injected small polished surface of a soil sample. When the soil sample is selected, the cylindrical soil sample is cut from the center of soil,so that the disturbance of the soil sample can be reduced; a treatment method of natural air drying is adopted, so that the disturbance of the soil sample is reduced; when the soil sample is loess, asoaking solution is prepared according to a volume ratio of epoxy resin to acetone to ethylene diamine to dibutyl phthalate of 200 to 100 to 6 to 4; when the soil sample is ancient soil, the volume ratio of the epoxy resin to the acetone to the ethylene diamine to the dibutyl phthalate is 200 to 100 to 7 to 3; the soaking solution is higher than the soil sample for 0. 5-1 cm; and the soil sample is hermetically soaked for 5-10 days. According to the preparation method, the refractive index of the soaking solution is close to the refractive index of the soil sample, and the soaking solution canfully fill pores of the soil sample to achieve sufficient hardness; and after the soil sample is polished, the height of the soil sample is 2-5 mm, so that the soil sample can be observed by a microscope.