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 discloses a double-wall closed soil sampling method and device for soft soil. The method comprises the steps that A, double-layer sampling pipes are connected to soil sampler connectors and fixed through pins; B, a double-wall closed soil sampler is placed down into the bottom of a hole and pressed into soil for sampling; C, in the soil sampler pressing-in process, a lifting rod moves downwards along with the soil sampler; D, after the soil sampler is pressed to reach the depth, the soil sampler is pulled out upwards after the sampling pipes are closed; E, after the soil sampler is lifted to the ground, whether the sampling pipes deform or not is detected; F, soil samples are conveyed to a laboratory, closed and kept upright after being sampled out. According to the double-wall closed soil sampling method and device for soft soil, the inner and outer layer sampling pipes are connected with the sampler connectors through the pins, the inner layer sampling pipe is formed by splicing five identical rectangular steel plates along long edges in a contact mode, and a soil breaking piece is located at the lower end of each steel plate and connected with the inner layer sampling pipe through a hinge. The method is easy to implement, operation is easy and convenient, the structure is simple, stability and reliability are achieved, the soil sampling quality is high, and the sampling rate is improved.

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 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 relates to the technical field of slope emergency rescue, and discloses a slope emergency rescue supporting device and method. The slope emergency rescue supporting device comprises a lattice beam structure, a pre-stressed anchor cable structure and slope surface spray anchor structures, wherein the lattice beam structure comprises a first profile steel ground beam, a second profile steel ground beam and a concrete anchorage pier, the first profile steel ground beam and the second profile steel ground beam are arranged at an included angle, the concrete anchorage pier is arranged at the intersection of the first profile steel ground beam and the second profile steel ground beam, the second profile steel ground beam is clamped between the first profile steel ground beam and the concrete anchorage pier, the pre-stressed anchor cable structure sequentially penetrates through the concrete anchorage pier, the second profile steel ground beam and the first profile steel ground beam and extends into the side slope structure, and the slope surface spray anchor structures are arranged between and around the first profile steel ground beam and the second profile steel ground beam. According to the method, secondary disturbance of the soil body caused by foundation trench excavation is avoided, foundation trench excavation time is saved, the construction progress is accelerated, and the method has the advantages of being short in construction period, high in safety and good in economic benefit and is suitable for slope emergency rescue construction engineering.

The invention discloses a field shallow undisturbed soil sampling device, which belongs to the field of soil sample test instruments. The device comprises a soil sampling bracket, a sampling cylinder,a jack, a driving force transmission shaft, a force transmission cross beam, a central column, a horizontal connecting rod, a sliding block, a driven force transmission shaft, a threaded cap, a levelbubble, a clamping block, a spring steel wire and an extractor. An undisturbed soil sample can be obtained in the field, and the jack is used for providing main power, so that the problems that the soil sample is seriously disturbed due to non-uniform force application, and when the soil sample with higher strength is taken, the pressing is difficult, the sampling efficiency is low and the like are solved; the sampling barrel suitable for the cutting ring or the triaxial soil sample size is directly adopted for taking soil, so that secondary disturbance to the soil sample when the soil samplewith the specific size is cut is avoided. When an upper sample extracting barrel is rotated, clamping blocks on the sampling barrel slide in the circumferential direction of the barrel body of the sampling barrel, the spring steel wires are pulled out to cut off barrel bottom soil, disturbance to a soil sample when the barrel bottom soil is separated from lower-layer soil is avoided, and the soilsampling success rate is increased.

The invention discloses a double-wall closed soil sampling method and device for soft soil. The method comprises the steps that A, double-layer sampling pipes are connected to soil sampler connectors and fixed through pins; B, a double-wall closed soil sampler is placed down into the bottom of a hole and pressed into soil for sampling; C, in the soil sampler pressing-in process, a lifting rod moves downwards along with the soil sampler; D, after the soil sampler is pressed to reach the depth, the soil sampler is pulled out upwards after the sampling pipes are closed; E, after the soil sampler is lifted to the ground, whether the sampling pipes deform or not is detected; F, soil samples are conveyed to a laboratory, closed and kept upright after being sampled out. According to the double-wall closed soil sampling method and device for soft soil, the inner and outer layer sampling pipes are connected with the sampler connectors through the pins, the inner layer sampling pipe is formed by splicing five identical rectangular steel plates along long edges in a contact mode, and a soil breaking piece is located at the lower end of each steel plate and connected with the inner layer sampling pipe through a hinge. The method is easy to implement, operation is easy and convenient, the structure is simple, stability and reliability are achieved, the soil sampling quality is high, and the sampling rate is improved.

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 relates to a frequency modulation method based on double-layer cooperative control of a wind storage system. Starting from optimizing the dynamic characteristics of the frequency response of the wind storage system and based on the theory of cooperative control, a two-layer cooperative control of frequency modulation response provided by flywheel energy storage and MPPT operating wind turbines is proposed. Program. By linearly combining the frequency deviation and the virtual electrical inertia of the wind turbines to form a macro variable, a speed regulation strategy with variable proportional coefficients is designed to realize the cooperation of wind turbines with different wind speeds to provide frequency support. Further, based on the linear combination of frequency deviation, energy storage frequency modulation power command and wind turbine virtual inertia to form a macro variable, the flywheel energy storage cooperates with the wind turbine to provide frequency support, quickly restore the wind turbine MPPT operation and avoid the frequency secondary disturbance. Additional frequency modulation active power Regulatory strategy. The invention has good robustness, simple control structure and easy engineering realization, can realize the frequency modulation response effect of the wind storage system to the power grid, and reduce the active power adjustment speed requirement for the synchronous generator to participate in the frequency modulation.

The invention discloses a saturated soil sample preparation device and a use method thereof, and belongs to the field of geotechnical test researches. The device mainly comprises a porous stone, a cutting ring, a spacer, a loading block and a water channel, wherein the inclined end face of the cutting ring is upward, and is placed on the porous stone cushioned with filter paper; the spacer is arranged at the upper end of the cutting ring and has an incline end face corresponding to that of the cutting ring; the spacer is made of rubber, and steel wire rings are arranged in the spacer; diameters of the steel wire rings are firstly reduced and then increased from bottom to top in the spacer; and mixed sludge is poured into the cavity formed by the cutting ring and the spacer, and the lower surface of the porous stone is at least submerged by water in the water channel. The device can be used for easily and quickly preparing a saturated remolded cohesive soil sample in one time.

The invention discloses a biochemical process sewage treatment system and a sewage treatment method thereof, the sewage treatment system comprises a sewage collection tank, a first dosing pipeline and a second dosing pipeline which are arranged in parallel, a clarification tank, a biochemical tank, a sludge blending tank, a first sedimentation tank, a second sedimentation tank, a third sedimentation tank and a third sedimentation tank. A first delivery pump and a first pipeline mixer are arranged on the first dosing pipeline, a second delivery pump and a second pipeline mixer are arranged on the second dosing pipeline, and a series branch is arranged between an outlet of the first delivery pump and an inlet of the second delivery pump or between the inlet of the first delivery pump and an outlet of the second delivery pump. A branch control valve is arranged on the series branch; according to the biochemical sewage treatment system and the sewage treatment method thereof, pressurized conveying can be realized when the caliber of the conveying pipe is reduced, and sludge is discharged by the tertiary sedimentation tank according to a siphon principle, so that the disturbance to the sludge in a sludge discharging process is greatly reduced, and the sludge sedimentation quality of the tertiary sedimentation tank and the effluent reaching the standard are ensured.

The invention discloses a zero-space construction method at the intersection and overlap of the upper and lower main tunnels of an underground overpass, which belongs to the tunnel engineering construction technology. Contains four major process steps: ①CRD excavation and support of the upper tunnel, and construction of reinforced concrete side beams; ②Excavation and support of the foundation pit of the lower tunnel; ③Secondary lining construction outside the lower tunnel; ④External lining of the lower tunnel Backfilling of the upper part of the secondary lining. The invention realizes the technical method that no soil body is left at the intersection and overlap of the upper and lower main tunnels of the underground interchange, and the excavation of the upper and lower main tunnels in the intersection section and the supporting structure are completed in one operation. It solves the influence of the later built tunnel on the structure of the first built tunnel and the secondary disturbance to the surrounding soil caused by the upper or lower passage caused by the successive construction of the upper and lower main tunnels.

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.

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.