57results about How to "Reduce the level of disturbance" patented technology

The invention discloses a model test apparatus for stimulating a tunnel excavation process, and belongs to the field of underground engineering test. Prototaxic sandy soil is adopted as a stratum condition, a lining structure adopts a stress similar galvanized iron thin wall cylinder, a non-contact strain displacement measurement and analysis system is adopted to observe the stratum deformation in the excavation process in a whole course real time manner, and an airbag loading system is adopted to simulate different embedded depths of a tunnel. A model opening mode is a loading and opening mode; and the test apparatus can be used to stimulate the excavation processes of an unlined tunnel and a lining structure possessed tunnel under different embedded depths. The stress similar galvanized iron thin wall cylinder is adopted to stimulate the lining structure, a built-in water capsule system is adopted to stimulate the excavation process and measure force and deformation, and the pressure of soil on the lining structure and the development rule of the pressure under different embedded depths are analyzed. The apparatus provides scientific understanding for the pressure change of surrounding rocks and the deformation mechanism of the stratum in the tunnel excavation process, and provides theoretic bases for tunnel design and construction.

Provided is a touch control display panel which has a plurality of pixel regions, wherein, each pixel region is provided with a shade area and a translucent area, the touch control display panel includes a first substrate; a second substrate located opposite to the first substrate, a plurality of touch control gap objects and a plurality of induction electrodes, respectively located on the first substrate and second substrate, in which a first gap (G [1]) is provided between each touch control gap object and the corresponding induction electrode; a barrier wall structure, located at one of the first substrate and the second substrate, in which the barrier wall structure is located in the shade area of the pixel region, and a second gap (G [2]) is provided between the barrier wall structure and the other one of the first substrate and the second substrate, and G [1] <G [2] <4G [1]; as well as a display medium, located between the first substrate and the second substrate.

The invention relates to a dynamic voltage restorer-based double-fed asynchronous wind generator unit control method. The method comprises the following steps: (1) building a dynamic voltage compensator-based double-fed asynchronous wind generator unit control system; (2) when a sudden change of a voltage is caused by a fault, obtaining a suddenly changed voltage vector for negative and negative sequence separation by a dynamic voltage restorer DVR; (3) calculating to-be-compensated voltage amount changing along with the time, and simultaneously giving a control signal; (4) outputting the voltage amount by the dynamic voltage restorer DVR, compensating a stator terminal voltage of a variable-speed and constant-frequency double-fed induction generator DFIG to stabilize the stator terminal voltage; (5) obtaining a suddenly changed new grid voltage vector when the sudden change is caused again during a fault period; (6) calculating the to-be-compensated voltage amount changing along with the time according to the suddenly changed voltage vector; and (7) outputting the voltage compensation amount by the dynamic voltage restorer DVR, and compensating the stator terminal voltage of the variable-speed and constant-frequency double-fed induction generator DFIG to stabilize the stator terminal voltage. The dynamic voltage restorer-based double-fed asynchronous wind generator unit control method can achieve stable fault ride-through.

The invention relates to a design method of a deeply-buried PBA subway station section. The design method includes the following steps that a, a void is detected; b, a composite anchor rod pile (14) is driven on the ground; c, a large pipe shed (4) is applied; d, small pilot tunnels (2 and 3) are constructed; e, grille arch centers for the small pilot tunnels (2 and 3) are erected; f, initial supporting is conducted on the inner parts of the small pilot tunnels (2 and 3), and then side piles (5 and 6) are applied in the small pilot tunnels (2 and 3) correspondingly; g, a main body arch part (1) is excavated, initial supporting is conducted, and a secondary lining structure (9) is poured by concrete; h, a soil mass of a lower main body center (10) is excavated; i, a bottom plate (11), a side wall (12) and a middle plate (13) of a lower secondary lining structure of the lower main body center (10) are constructed; and j, an accessory structure is applied, and a complete station structureis formed. According to the method, the construction safety, the construction quality and the construction period can be ensured, the cost can be saved, and the construction efficiency can be improved; and section structure design is reasonable, the overall structure is stable, construction is easy and convenient, and the use effect is good.

The invention relates to a method for laying an electrochemistry desalting external anode through magnesium phosphate cement and a carbon fiber sheet, and belongs to the technical field of reinforced concrete structure electrochemistry desalting. The magnesium phosphate cement is prepared from magnesia, phosphate, retarder, water and electric conduction materials according to a certain proportion; the surface of concrete to be desalted is polished to be flat and evenly coated with the magnesium phosphate cement, the thickness is 2 mm-3 mm, and the magnesium phosphate cement is smoothed; the carbon fiber sheet is attached to the surface of the magnesium phosphate cement and rolled in the fiber direction through a roller, bubbles are extruded out, and therefore the carbon fiber sheet is tightly attached to the working surface; after the magnesium phosphate cement is hardened, a copper wide adheres to the surface of the carbon fiber sheet to be connected with a positive pole of an external direct-current power source for a desalting test. The method for preparing the electrochemistry desalting external anode has the advantages that the material cost is low, laying is easy, convenient and rapid, the desalting effect is good, and the application range is wide, and has good application and popularization prospects.

The invention relates to the field of building engineering, and in particular relates to an on-site testing method for the dry density of fine sand subgrade. The method is characterized by at least comprising the following steps: taking out a certain amount of fine sand test pieces from the fine sand subgrade so as to carry out interior dry density testing, measuring the dry density of the fine sand test pieces by a ring cutter, calculating the ratio of the two dry densities as a correction coefficient of the ring cutter, and correcting the dry density in on-site testing of the fine sand subgrade according to the correction coefficient of the ring cutter. The method has the advantages of firstly, being capable of reducing a disturbance zone formed in pressing of the ring cutter and reducing the disturbance degree to the fine sand subgrade by adopting the thin-wall ring cutter, secondly being capable of increasing total mass of samples and relatively reducing the test errors due to disturbance by adopting the large-volume ring cutter, and finally avoiding errors formed by pressing disturbance of the ring cutter through utilizing a large compaction cylinder to stimulate the on-site sand sample and adopting the correction coefficient of the ring cutter to reflect the difference of the test value of the ring cutter and the true value.

The invention discloses an aerial operation robot for power transmission line maintenance, which comprises an unmanned aerial vehicle platform, a Delta parallel mechanism and a cutting operation mechanism, wherein the Delta parallel mechanism is fixed below the unmanned aerial vehicle platform, and the cutting operation mechanism is fixed at the tail end of the Delta parallel mechanism; the cutting operation mechanism at least comprises a clamping mechanism supporting plate, a clamping mechanism and an electric heating wire; the clamping mechanism is fixed to the clamping mechanism supportingplate, a containing space is formed in the clamping mechanism and used for containing a power transmission line, and the electric heating wire is fixed to the clamping mechanism and transversely penetrates through the containing space. The aerial operation robot provided by the invention can cut off the floating hanging object from the upper side; since the electric heating wire directly cuts offthe connection point of the floating hanging object and the power transmission line, the situation that residues are left does not exist, and the cutting effect is better.

The invention discloses an along-slope shear wall building development platform. The along-slope shear wall building development platform comprises embedded type shear walls (1) arranged along a slope in parallel, wherein the lower ends of the shear walls (1) are arranged in stable rock bodies of a side slope (4), and the upper ends of the shear walls (1) are positioned at the same horizontal height; frame beams (2) are arranged at the upper ends of the shear walls (1), and the frame beams (2) are connected with the shear walls (1) through reinforced concrete; and a platform (3) is arranged at the upper ends of the frame beams (2), and the platform (3) is connected with the frame beams (2) through reinforced concrete. The along-slope shear wall building development platform has the benefits that the cross section of the shear walls along the slope is much smaller than that of shear walls directly dug, so that digging area is small, and disturbance caused to the side slope by construction is small; 2, the width of the shear walls along the slope is large, so that high vertical bearing capacity can be provided; 3, the shear walls also can stand the downward sliding force of the side slope to a certain degree, so that the stability of the side slope is facilitated; and 4, a building can be constructed at the upper part of the platform, the side slope can be fully utilized, and compared with direct digging construction, the along-slope shear wall building development platform is small in engineering quantity, simple in construction and high in safety.

The invention discloses a mounting method, a dismounting method and a using method of a hollow cylinder sample. The hollow cylinder sample comprises an inner cylinder, a consolidation outer cylinder, a permeable top cover and a drainage chassis, wherein the inner cylinder comprises four inner cylinder assemblies which are arranged in an arc shape, fixing grooves and water permeable holes; the consolidation outer cylinder comprises two semi-circular consolidation outer cylinder assemblies, a fixing table, a fixing hole A, locking blocks, limiting grooves and limiting blocks; a through hole is formed in the center of the permeable top cover; the whole drainage chassis is in a disc shape and provided with water collecting holes. The installation and connection adopts a mortise and tenon buckling mode, so that a soil sample can be more accurately close to the required standard size; a vacuum bin with relatively high leakproofness is formed, so that water and gas can be conveniently discharged, and the water content can be more accurately controlled; and moreover, the disturbance degree on the soil sample during sample disassembly is effectively reduced, secondary cutting on the inner diameter and the outer diameter of the soil sample is avoided, and the possibility is provided for rapidly manufacturing the saturated hollow cylindrical sample with the inner diameter and the outer diameter of the international common standard at one time.

The invention relates to a range hood and a fan assembly thereof; a noise reduction module is additionally arranged at an air inlet of a volute on the fan assembly, the noise reduction module is optimally designed, the noise reduction module can achieve the effects of smoothing air flow at the air inlet and reducing the turbulence intensity of the air flow at the air inlet, and the purpose of reducing noise of the range hood is achieved under the condition that the air volume and air pressure of the range hood are not affected. An annular grating of a noise reduction grating can reduce radialflow of air flow at the air inlet, a radiation grating can reduce circumferential flow of the air flow at the air inlet, and therefore the disturbance degree of the air flow is reduced. The air inletends of all the annular gratings are matched with the airflow velocity contour distribution at the air inlet, so that airflow with the same velocity can enter the annular gratings at the same time; the distribution direction of the annular grating is consistent with the airflow speed direction of the air inlet. On one hand, airflow disturbance can be reduced, noise is reduced, and on the other hand, the air volume and the air pressure are not affected.

The invention discloses a wooden energy dissipation and shock absorption device and a wooden structure system with the same. The wooden energy dissipation and shock absorption device comprises two connecting sections, wherein the two connecting sections are connected through an energy dissipation section. The energy dissipation section comprises two sections of wooden connecting pieces, wherein the two sections of the wooden connecting pieces are connected through soft steel shear dampers, dovetail-shaped tenons are separately arranged at the outer ends of the two wooden connecting pieces, dovetail-shaped grooves are separately formed in the two connecting sections, and the tenons of the two wooden connecting pieces are separately inserted into the grooves of the two connecting sections. The connecting sections are wooden columns or wooden panel walls. When the connecting sections are the wooden columns, friction plates are separately arranged at the outer ends of the two wooden connecting pieces. A main structure of the wooden structure system is rigidly connected with the wooden energy dissipation and shock absorption device. According to the wooden energy dissipation and shock absorption device, earthquake energy can be dissipated, the damage to wooden structure buildings under an earthquake is reduced, and energy dissipation components after the earthquake are convenient toreplace. The wooden energy dissipation and shock absorption device and the wooden structure system with the same can be used for improving the seismic performance of existing wooden structure buildings and building new wooden structure buildings.

The invention relates to the field of tunnel support, in particular to a construction method suitable for a soft rock bedding tunnel, which comprises the following steps: S1, excavating reverse-tilting upper step core soil, and constructing a first support system; S2, excavating core soil of the lower step of the reverse side, and constructing a second supporting system; S3, excavating upper stepcore soil along the inclined side, and constructing a third support system; S4, excavating core soil of the lower step along the inclined side, and constructing a fourth support system; and S5, disassembling the temporary support, and constructing a secondary lining. According to the construction method, reasonable excavation steps and supporting structures are adopted in a targeted mode accordingto the bias deformation characteristic of the bedding tunnel and the surrounding rock stability difference, deformation during tunnel construction can be effectively controlled, surrounding rock self-bearing is given to full play, the surrounding rock stability is improved, and therefore the construction risk and the engineering cost are reduced.

The invention relates to a water sample collection system and a water sample collection method for taking a sample from water drained from a pump pipe. The water sample collection system is formed as follows: the sampling end of a pipe orifice plugged sampling device is arranged in a water drainage pipe orifice of a quasi-water sampling pump pipe; the output port of the pipe orifice plugged sampling device is connected to the input port of a self-priming pump through a hose; the output port of the self-priming pump is connected with a three-way joint through a pipeline; an upper opening of the three-way joint is connected with the input port of a mass stabilizer through a pipeline; a bypass opening of the three-way joint is connected with a flow division control valve through a pipeline; the output port in the upper end of the mass stabilizer is connected with a split combined type sampling bottle through a pipeline. The water sample collection system disclosed by the invention can realize fast mounting and center positioning of a water outlet pump pipe of a water pump, so that the quickness and the convenience of sampling operation are improved; the water sample and environment-sensitive substances in the water sample pass through the collection system under a state of relatively dynamic balance, so that the disturbance is low, the escape quantity of volatile substances is small, and the fidelity of the sample is improved.

The invention relates to a water sample collecting system and method for surface water and spring water. According to the water sample collecting system, an input port of a self-priming pump is connected with a water inlet pipe or a spherical filter through a pipeline, an output port of the self-priming pump is connected with a tee joint through a pipeline, an upper port of the tee joint is connected with an input port of a quality stabilizer through a pipeline, a bypass port of the tee joint is connected with a flow-distributing control valve, and an output port in the upper end of the quality stabilizer is connected with a split combined sampling bottle through a pipeline. Firewood, EVA sheets and other solid objects in the water and solid particle substances in the water can be effectively filtered away, a sample is in a pressure-bearing and oxygen-isolating state once entering the water sample collecting system, the collected water sample passes through the water sample collecting system when in a relatively dynamic balance state and is little disturbed, the probability of volatile substance escape is lowered, and therefore the problem that by the utilization of a direct filling mode, when a water sample containing environmentally-sensitive substances is collected, sample distortion occurs is solved.

The invention provides a rotary drawing film blowing production technology. In a rotary drawing process, the rotating speed of an either-rotation motor is gradually reduced with increase of an included angle between a central axis of a fourth horizontal moving guide roller and a reference direction, and the rotating speed of the either-rotation motor is gradually increased with reduction of an included angle value; when the included angle value is zero, the rotating speed of an either-rotation motor reaches the maximum value; and a central control unit controls output air speeds of a variable-frequency fan at all moments according to the included angle between the central axis of the fourth horizontal moving guide roller and the reference direction. According to the technology, the problems of scratching and pulling damage of a thin film can be solved, besides, a film roll obtained by final rolling is relatively compact, and the edges are relatively neat.