638results about How to "Reduce bending moment" patented technology

The invention discloses a clamping mechanism which comprises a shell and an oil cylinder installed in the shell, wherein clamping blocks are distributed in the front part of the shell in bilateral symmetry; and the inner side surfaces of the front half parts of the clamping blocks are inner concave surfaces. The clamping mechanism is characterized in that a cylinder barrel of the oil cylinder is centered at the rear part of the shell; the front end of a piston rod of the oil cylinder is articulated with a connecting plate; the left part and the right part of the connecting plate are respectively articulated with the rear ends of the clamping blocks; the front part of at least one cover plate of the shell is symmetrically provided with guide grooves left and right; guide pins are arranged in the middle parts of the two clamping blocks and inserted into the guide grooves; fixed blocks are clamped and fixed in the middle parts of the front ends of the two cover plates, and the normal lineof the surfaces of the front parts of the inner concave surfaces of the two clamping blocks are inclined to the directions of the fixed blocks. The invention has simple structure, high strength and large clamping force and can be suitable for different pipe columns with the external diameter range of 3.5-9.75 inches without replacing the clamping mechanism, and the clamping mechanism can not interfere with the adjacent pipe column during working.

The invention discloses a support system for a long-span cable-stayed bridge, which relates to the technical field of bridge engineering. The support system consists of nine parts including main girders, bridge towers, stay cables, transitional piers, transverse wind resisting bearings, longitudinal viscous dampers with limiting function, longitudinal sliding bearings with limited transverse rigidity, transverse dampers, and telescopic devices. Compared with the prior support system for the long-span cable-stayed bridge, the support system of the invention has the characteristics that the longitudinal viscous dampers with limiting function are arranged between the main girders and the bridge towers; and the longitudinal sliding bearings with limited transverse rigidity and the transverse dampers are arranged between the main girders and the transitional piers. The support system provides effective rigidity and damping for the long-span cable-stayed bridge to ensure that the static force and the dynamic force responses of the bridge are controlled in an acceptable scope; the structural stress is definite; and the applicability is strong.

A connection between a wall stud or post and an anchor bolt embedded in a concrete foundation, using a holdown connector that attaches to the anchor bolt and supports the wall stud or post above it. The holdown connector has a tapered bottom that allows it to rotate laterally, allowing the connection to act more purely in tension than is possible with a rigid connection.

The invention discloses an experimental device for comprehensively testing dynamic characteristics of a linear feeding system and belongs to the technical field of machinery manufacturing. The device comprises a single-degree-of-freedom servo feeding mechanism, a longitudinal loading mechanism, a gantry frame, a transverse loading mechanism, a vertical loading mechanism, a friction loading mechanism and an inertia matching mechanism, wherein the single-degree-of-freedom servo feeding mechanism controls the position of a worktable; the longitudinal loading mechanism controls amplitude and direction of longitudinal loading force; the transverse loading mechanism controls amplitude of transverse loading force; the vertical loading mechanism controls amplitude of vertical loading force; the friction loading mechanism controls application of a friction load; and inertia matching mechanism can research inertia matching characteristics. The device is reasonable and compact in structure, convenient to maintain and wide in application range, can simulate a longitudinal load, a transverse load, a vertical load, torque and a composite load at any position of the worktable and accurately controls the loading force.

The invention relates to a magnetic levitation rotor wing system and a helicopter with the same and the field of aviation, in particular to the technical field of rotor wings. The magnetic levitation rotor wing system comprises a rotor wing ring (2) and a rail ring (1), wherein the rotor wing ring (2) is connected with a rotor wing propeller point, and the rail ring (1) provides magnetic suspension force for the rotor wing ring (2). Magnetic suspension force provided by the rail ring (1) includes a driving device capable of driving blades to rotate and a suspension device capable of enabling the propeller point to suspend. A first deflection driving mechanism is arranged on the root portions of the blades of the rotor wing so that first deflection angles of the root portions of the blades can be provided, and a second deflection driving mechanism is arranged on the rotor wing ring (2) so that second deflection angles of the points of the blades can be provided. According to the magnetic levitation rotor wing system and the helicopter with the same, only an outside rail ring is needed to drive the rotor wing ring, and the blades are connected by a central connecting component; and the requirement of independent variable pitch of the rotor wing is guaranteed, partial load of the blades is counteracted with one another through the central connecting component, integrality of the rotor wing ring is increased, and working reliability of improved.

The invention discloses a self-elevating ocean platform hydraulic plug lifting system, and belongs to the field of ocean engineering equipment. The self-elevating ocean platform hydraulic plug lifting system comprises a movable ring beam, a fixed ring beam corresponding to the movable ring beam, plugs and lift oil cylinders between the fixed ring beam and the movable ring beam, two lift oil cylinder pin shaft seats are arranged on each cross beam, plug seats are arranged between the lift oil cylinder pin shaft seats of the respective cross beams, one ends of the lift oil cylinders are arranged in the lift oil cylinder pin shaft seats on the fixed ring beam through lift oil cylinder pin shafts, and the other ends of the lift oil cylinders are arranged in the lift oil cylinder pin shaft seats on the movable ring beam through lift oil cylinder pin shafts. The lift oil cylinders and the plugs of the hydraulic plug lifting system are arranged on the same cross beams, and therefore the requirement of the cross beams for welding seams can be lowered, and acting force transmitted from the lift oil cylinders and the plugs can be borne by adopting the requirement for general welding seams.

The invention provides a bilateral double-spring driving unfolding mechanism. The unfolding mechanism comprises moving hinges, fixed hinges, concentric shafts, volute spiral springs, spring blocks, spring outer end covers, spring inner ring fixing sleeves, spring outer ring fixing shafts, spring outer ring fixing sleeves, spring outer ring fixing sleeve pressing covers, locking hooks, locking hook rotating shafts, locking hook locating sleeves, locking hook locating torsional springs, locking hook locating torsional spring pressing rods, limiting screws and a microswitch. The fixed hinges and the moving hinges achieve connection and a relative rotating function through the concentric shafts, four sets of bilateral plane volute spiral springs act on the fixed hinges and the moving hinges at the same time, the locking hook locating torsional pressing rods are matched with the locking hook locating torsional springs to enable locking shafts at the tail ends of the locking hooks to slide into the bottom faces of bosses on sliding rails of the fixed hinges, so that locking locating is finished, and meanwhile the microswitch is triggered to send a successfully arriving signal to a control system. The bilateral double-spring driving unfolding mechanism is relatively simple in achievement form, achieves a driving source redundant backup function, and is light in weight, compact in structure, high in reliability and strong in bearing capacity under the same driving capacity.

The invention discloses a double-row pile foundation pit supporting method, wherein double-row piles are as follows: a front row of piles are inclined to the outside of the foundation pit and a rear row of piles are vertical. The method comprises the following steps: (a) the inclination angle of the front row of piles, the pile length and the pile shaft strength of the front row of piles and the rear row of piles, the space between the front row of piles and the rear row of piles, and the excavation progression of the foundation pit are determined according to the site condition and computational analysis; (b) the cross section, reinforcing ribs and the space of connection beams between the front row of piles and the rear row of piles are determined; (c) the front row of piles and the rear row of piles are constructed; (d) connection beams between top beams on the top of row piles and the row piles are constructed; (e) the foundation pit is excavated; and (f) the bottom of the foundation pit is cleaned and leveled and subjected to further construction. The double-row pile foundation pit supporting method can avoid arrangement of an inner support and an anchor rod to a large degree, is suitable for soft soil and various soil conditions, and can reduce the top displacement of small piles, the bending moment of pile shafts and the construction cost, increase the excavating depth and reduce possibility of causing toppling failure.

The invention discloses a testing device for vertical and continuous loading at an optional position of a numerical control moving table and belongs to the technical field of mechanical manufacturing. The testing device comprises a simulated numerical control moving table, a gantry frame, a transverse moving mechanism and a vertical loading device. Position of a loading point and magnitude of vertical load are loading requirements need to be met by the loading device, and axial position control, transverse position control and vertical load control are achieved by a servo motor respectively. Feedback of magnitude of the vertical load is achieved by a pressure sensor, and closed-loop control of magnitude of vertical loading force is achieved by regulating compression amount of a loading spring. Vertical loading at an optional position of the moving table can be achieved, and magnitude of the loading force can be precisely controlled by the testing device.

A tension sensing assembly for a seat restraint system in a vehicle is provided. The tension sensing assembly comprises an anchor, a movable mechanism configured to be secured to a portion of a buckle, at least one magnet coupled to the movable mechanism, a Hall effect sensor coupled to the anchor, at least one tension spring secured to the anchor at a first end and the movable mechanism at a second end. The movable mechanism moves the at least one magnet relative to the Hall effect sensor to induce an output from the Hall effect sensor. The output indicates a tension level being applied to the tension sensing assembly.

A connection between a wall stud or post and an anchor bolt embedded in a concrete foundation, using a holdown connector that attaches to the anchor bolt and supports the wall stud or post above it. The holdown connector has a tapered bottom that allows it to rotate laterally, allowing the connection to act more purely in tension than is possible with a rigid connection.

The invention relates to a fixed post type fully rotary crane, which belongs to crane transportation machinery for a boat. A flange (2) is arranged on the outer surface of the middle lower section of a fixed post, a fixed post top shaft (17) is arranged in the end surface center of the top of an upper fixed post (7), a rotary supporter (3) is connected above the flange (2), the upper part of the rotary supporter (3) is fixedly connected with a rotary table (6), a hanging arm (13) and a top pulley frame (8) are respectively hinged on the rotary table (6), a top bearing (11) and a top pulley group (9) are respectively and fixedly arranged on the top pulley frame (8), the top bearing (11) is sheathed onto the fixed post top shaft (17), a rotary mechanism (4) is arranged on the rotary table (6) or a lower fixed post (1), the integral height of the crane is reduced, in addition, the full rotation is realized, the operation of the whole machine is stable, the load bearing and the bending resistance capability of the crane are greatly improved, the service life is greatly prolonged, and the fixed post type fully rotary crane is particularly suitable for being used on large-scale floatingcrane boats and ocean engineering boats with crane weight limitation and navigation height limitation.

The invention discloses an anti-typhoon operation control method of a wind power generator group, including: typhoon forecast signals are received; before the coming of a typhoon, blades are feathered, the generator cabin is controlled to actively drift and assure the tail part of the generator cabin of facing to wind, thus releasing a drift brake and stopping; when the typhoon comes, by the function of the tail rudder of the blades, the windward angle of the tail part of the generator cabin is continuously adjusted, thus realizing a free drift of the generator cabin according to wind direction. Due to the feathering of blades before the coming of the typhoon, by controlling the active drift of the generator cabin, the head part of the generator cabin rotates to downwind direction from where the typhoon comes, thus the free drift of the generator cabin is well prepared by the tail part of the blades; when the typhoon comes, the free drift of the generator cabin is realized by depending on the aerodynamical moment applied to the blades, and the windward angle of the tail part of the generator cabin is continuously adjusted by the function of tail rudder of the blades to reduce wind load, blade root bending moment, and overturning moment applied to the generator group, thus preventing any damage to the generator group. On the basis, the invention additionally discloses an anti-typhoon operation control device of a wind power generator group and a wind power generator group using the device.

The invention discloses a method for adjusting the weight of fillers on a masonry arch bridge in a partitioning manner. The masonry arch bridge comprises a main arch ring (1), spandrel arch rings (2), a filler layer (3) on arches, and a bridge panel (4). The method comprises the steps: the filler layer (3) on the arches is divided into an arch top area (31) and spandrel arch areas (32), wherein the arch top area (31) is formed between the main arch ring (1) and the bridge panel (4), and the spandrel arch areas (32) are formed between the spandrel arch rings (2) and the bridge panel (4); lightweight concrete fillers with the apparent density from 800kg / m3 to 1200 kg / m3 are filled into the arch top area (31), and lightweight concrete fillers or ordinary soil quality fillers with the apparent density from 1200kg / m3 to 1950 kg / m3 are filled into the spandrel arch areas (32); and the weight of the filler layer (3) on the arches is adjusted by calculating three objective functions, i.e. bending moments Md, M1 / 4 and Mj generated by the main arch ring on the arch top, the one quarter of an arch span, and arch feet, and the like. The method has the advantages that the utilization efficiency of arch ring materials can be improved, the distribution of the internal force of the main arch ring is improved, and the carrying capacity of the arch bridge is improved.

The invention relates to a heavy draught truss type floating platform, which is characterized by comprising a lower buoyancy tank. A square hole is arranged in the center of the lower buoyancy tank, a plurality of watertight cabins are arranged in the lower buoyancy tank at intervals, counterweights used for pressing the cabins are disposed in the watertight cabins, a heave plate which is integrally connected with the lower buoyancy tank is disposed at the bottom of the lower buoyancy tank, a plurality of through holes are disposed on the heave plate, a plurality of connecting holes are arranged on the top of the lower buoyancy tank, a space truss which is integrally welded with the lower buoyancy tank is fixedly connected to the lower buoyancy tank by the connecting holes, the top of the space truss penetrates through a square hole disposed in the center of an upper buoyancy tank, a circle of a watertight channel is disposed in the upper buoyancy tank, a plurality of watertight cabins are arranged on two sides of the watertight channel at intervals, a plurality of upright columns with large sections are arranged on the top of the upper buoyancy tank, a group of mooring ropes connected with a seabed is arranged on each upright column, and oil and gas treating modules and well drilling modules are arranged on the insides and the tops of decks. The heavy drought truss type floating platform is widely used for offshore oil exploitation.

The invention discloses an assembly type recycled concrete node with steel bar truss girders at end parts and a manufacturing method thereof, belonging to the technical field of constructing of prefabricated parts and key nodes and regenerating of concrete. The assembly type recycled concrete node has the advantages of environment friendliness, energy saving and convenience in construction, and is applicable to prefabricated construction, so that the problems that the key nodes of the existing prefabricated parts are poor in seismic performance and severe in seismic hazard, and the defect that the node construction is difficult can be overcome by integrally casting a wing-tip beam and an upright post; and moreover, autoclaved curing prefabrication forming is adopted, so the compactness, the casting quality and the strength of the concrete at the nodes are remarkably improved, thereby realizing an anti-seismic design target of strong nodes and weak rods, as well as connecting the wing-tip beam with the prefabricated beam with the steel bar truss girders by bar splicing. A stirrup strengthening zone is arranged at the connecting part, and the connecting part is set to be a post-cast strip, so that plastic hinges are easily formed under earthquake load action. An ideal failure mechanism with the anti-seismic design concept of strong columns and weak beams, and strong shear and weak bending can be extensively applied to precast construction.

The invention relates to a horizontal bending machine which comprises a machine body, a controller, a bending mechanism and a follower plate. The bending mechanism is horizontally arranged on the machine body. The follower plate is arranged in a workpiece feeding direction of the bending mechanism. In time of bending, the controller controls a workpiece to moving into the follower plate and the position of the workpiece is limited by the follower plate and the bending mechanism. The bending mechanism bends the workpiece and acts synchronously with the follower plate. The bending precision is improved, a bending die can rotate independently so that restoring is convenient and multiple bending of the workpiece is facilitated. A whole bending process of the workpiece is fully automatic so that the production efficiency of the bending machine is improved, labor intensity of operators is relived and at the same time, quality and stability of products can be improved. In time of material pressing, the bending machine can be suitable for clamping heat exchangers with different layer thickness and layer numbers so that application range is wide. Synchronous action of the bending mechanism and the follower plate in time of bending can be achieved, friction when the workpiece is bent is reduced and quality of the workpiece is improved. The workpiece can be bended in a delamination mode, required bending moment is little, relative pressure among heat exchanger fins and the bending die and among layers of the heat exchanger is small and the heat exchanger fins are not prone to fall.

The invention relates to a micro-blanking forming device and a forming method, in particular to a high-frequency auxiliary micro-blanking forming device and a method for a foil plate. The device and the method aim at solving the problems in the existing high-precision blanking forming of the foil plate that an interval between a female die and a male die is small, a blanking force is significantly increased by a size effect, and the dies are badly worn and have short service lives. The device comprises a female die fixing plate, a lower bolster and a lower die plate that are sequentially connected from the top down, wherein an upper die plate and a male die fixing plate are sequentially arranged above the female die fixing plate; a female die is embedded into the middle part of the upper surface of the female die fixing plate; a vibration component and a punch are sequentially mounted in the male die fixing plate from the top down in an inserting manner; a middle line of the punch is coincided with that of the female die; the vibration component is connected with a high-frequency power source; a guide sleeve is mounted on the upper surface of the female die fixing plate in an inserting manner; the upper end of a guide column is mounted in the male die fixing plate in an inserting manner; and the lower end of the guide column is mounted in the guide sleeve in an inserting manner. The device and the method are used for blanking forming of the foil plate.

The invention discloses a prefabricated pier and bearing platform connected structure. The prefabricated pier and bearing platform connected structure is characterized in that a bottom connecting section of a pier body of the pier is connected with the top surface of the bearing platform to be formed into a whole. The bottom connecting section of the pier body and the bearing platform can be poured together; or a prefabricated section member can be inserted into the bearing platform; shear keys which are correspondingly matched with each other are arranged at a connecting position of the pier body bottom connecting section and the pier body prefabricated section. The prefabricated pier and bearing platform connected structure and a butt joint construction method thereof have the advantages of effectively reducing bending moment at seaming positions, improving stained condition of seams and improving durability of the seams due to the fact that seaming cross sections are moved upward from the pier bottom through a butt joint structure; strengthening shear resistant performance of the seams and being convenient to construct due to the fact that the shear keys with corresponding concave and convex surfaces are arranged on the seams; enabling force bearing of the pier and the bearing platform connection to be reliable, being convenient to construct, simple to operate and easy to control, effectively reducing workloads for field welding and concrete pouring and enabling construction process to be speeded up.

The present invention relates to a single cone bit used for petroleum well drilling and geological prospecting field. The single cone bit includes a bit body and a cone. The bit body is connected to the cone through a bias bit leg journal at lower end. It is characterized in that the cone surface is composed of a main distribution tooth surface and at least one auxiliary distribution tooth surface; the main distribution tooth surface is cone surface or cone ball surface, the auxiliary distribution tooth surface is ball surface or truncated cone surface. The main distribution tooth surface and the auxiliary distribution tooth surface are mounted with teeth. The invention adopts a cone shape combined by main and auxiliary distribution tooth surfaces, and can reduce the tooth scrape distance, make the cutting load of each part of teeth of the cone be reasonably distributed in order to reduce the abrasion of the teeth and reinforce the impact effect of the teeth to make the bit can be adapted to break rigid ground and prolong the effective use life of the bit. The invention can increase the cone surface, dispose plurality of teeth, and can make the reverse composite force of the rock for the cone bit adjacent to the bit axes; the invention also can satisfy the requirements for drilling different ground.

The invention relates to an all-terrain vehicle based on a four-connecting-rod deformable principle, which is an all-terrain vehicle according to a deformable principle. The all-terrain vehicle adopts a modularized design and can adapt to a plurality of terrains. A first module is in a front wheel structure; related mechanical design knowledge is used for designing a four-connecting-rod type front wheel structure; a rack of four connecting rods is mounted on a vehicle body; a front wheel is fixed on connecting rods; and a steering engine is fixed on the connecting rods to control the direction. In order to increase the friction force between the front wheel and the ground, stretched springs are mounted in opposite angle directions of the four connecting rods so that the front wheel is prevented from leaving away from the ground. A second module comprises wheels on two sides of the vehicle body; the two sides of the vehicle body adopt symmetrical structures and adopt four-connecting-rod structures; wheels are fixed on two cranks, and the connecting rods and the rack are fixed on the vehicle body; and meanwhile, the vehicle body can rotate freely. According to the all-terrain vehicle, the front wheel and the wheels on the two sides adopt the four-connecting-rod structures so that the all-terrain vehicle has the characteristics of strong adaptive capacity, high stability, simple and reliable structure, reasonable overall layout, simple and beautiful appearance, prominent movement performance, simple and efficient control and the like.

The invention discloses a supporting method of a pile foundation pit, the pile is the single-row pile inclining to the outside of the foundation pit, and the method comprises the following steps: (a) according to site conditions and computational analysis, the angle of inclination of the pile, the pile length and the pile body strength, the foundation pit supporting structure, and the excavation progression of the foundation pit are determined; (b) the piles are constructed; (c) the foundation pit supporting structure is constructed; (d) the foundation pit is excavated; and (e) clearing and leveling are carried out to the bottom of the foundation pit, and the construction work of the next step is carried out. The method can reduce the displacement of the pile bolck, reduce the bending moment of the pile body and lower construction cost to a large extent, also can increase excavation depth and reduce the possibility of the occurrence of overturning damage.

The invention discloses a buckling constraint type steel-beam-and-column end-plate connection joint and a steel structure building, and belongs to the field of a building steel structure. The buckling constraint type steel-beam-and-column end-plate connection joint comprises a steel beam and a steel column; an end connecting piece is arranged at a joint of the steel beam and the steel column; the end connecting piece comprises a pair of horizontally arranged flange connecting plates and end plates arranged at the tail ends of the flange connecting plates; the free ends of the flange connecting plates are used for being connected with upper and lower flanges of the steel beam; both ends of the end plates are used for being connected with flanges of the steel column; the middle parts of the flange connecting plates are weakened regions. According to the buckling constraint type steel-beam-and-column end-plate connection joint and the steel structure building which are disclosed by the invention, seismic performance is superior, and ductility and the energy consumption ability of a steel frame structure can be obviously improved; plastic hinges are moved outside, so that appearance of the plastic hinges at the welded positions at the end parts of the steel beam is avoided; after an earthquake, the steel beam and the steel column are not damaged, and can be reused only by replacing or repairing the end connecting pieces; moreover, the buckling constraint type steel-beam-and-column end-plate connection joint is convenient to mount.

The invention discloses a construction method of a multifunctional tower crane used for building construction. The multifunctional tower crane comprises a base, a hanging rack, a balancing arm, an operation room and a cargo boom. The balancing arm and the cargo boom are erected on the two sides of the hanging rack correspondingly in a balanced mode. A water pipe is vertically arranged in the hanging rack. A water pipe is transversely arranged in the cargo boom. A plurality of spray nozzles are uniformly distributed in the water pipe transversely arranged in the cargo boom. A sliding device is arranged on a front boom body of the cargo boom. A lifting hook is arranged below the sliding device. A cable is arranged below the lifting hook. The cable is connected with a concrete stirring box. Monitoring probes are arranged at the tail end of the cargo boom and the lifting hook. By the adoption of the construction method of the multifunctional tower crane used for building construction, a lifting and conveying function is achieved, and poured concrete can be wet and cooled through watering by spraying water mist, or dust removal can be achieved through mist spraying.

The invention discloses a diameter-adjustable pipe fitting cutting device and belongs to the technical field of pipe fitting cutting. The diameter-adjustable pipe fitting cutting device comprises a baseplate, wherein a clamp support plate is arranged on the left side of the top of the baseplate; a dovetail guide is arranged on the outer wall of the right end of the clamp support plate; a round table lug is arranged on the outer wall of the right end of the clamp support plate and located at the front end of the dovetail guide; a fixed link is arranged at the right end of the round table lug; external threads are formed at the right end of the outer wall of the fixed link; an eccentric round disk sleeves the outer wall of the fixed link; a movable V-shaped block is arranged at the right endof the clamp support plate; and a fastening screw is arranged at the tops of a movable turnover clamp plate and a fixed clamp plate through through holes. The cutting device suitable for pipe fittings with different diameters finishes fixation of the pipe fittings with different diameters through the V-shaped block and a clamp plate component and finishes cutting of the pipe fittings with different diameters through a combined cutting component, so that the university of the pipe fitting cutting device is improved.

The invention discloses a prestressed concrete wind power tower system and a construction method thereof. The prestressed concrete wind power tower system is characterized in that the upper end of a tower main body is connected to a wind driven generator; the tower main body is formed by sleeve connection of a concrete tower drum located at the lower part and a steel tower section located at the lower part; the tower main body is tied by prestressed cables for fixation; the prestressed cables comprise vertical prestressed tendons arranged inside the concrete tower drum at the lower part and slant prestressed cables arranged outside the concrete tower drum at the lower part; the upper ends of both the vertical prestressed tendons and the slant prestressed cables are anchored on a flange at the bottom of the steel tower section at the upper part; and the lower ends of the slant prestressed cables are fixedly connected to an anti-pulling foundation, and the lower ends of the vertical prestressed tendons are in anchor connection with a pedestal of the concrete tower drum. The wind power tower system has the beneficial effects that template engineering can be simplified to the maximum extent, the template cost of the tower structure is reduced, the prefabrication work in a factory prefabrication stage can be substantially simplified, and the efficiency of factory prefabrication is improved.

The invention discloses a transverse and longitudinal profiling device for a planting mechanism and a control method, the transverse and longitudinal profiling device comprises a frame, signal acquisition units, a signal feedback control system, a hydraulic execution system, a planting frame lifting mechanism, a planting frame and hydraulic profiling mechanisms; the signal acquisition units at the left side and the right side of the planting frame are connected by the signal feedback control system and the hydraulic execution system, the signal acquisition units sense changes of the distance between the signal acquisition units at the left side and the right side, the signal feedback control system controls the hydraulic execution system to drive the hydraulic profiling mechanisms at the left side and the right side to lift up and down respectively so as to drive the planting frame to lift up and down or rotate left and right to ensure consistent relative height of a duck mouth planting component and a ridge side, and planting depth profiling of the planting component can be realized. A distance sensor is used to sense terrain changes, and the distance sensor is sensitive to respond and has no delaying advancing phenomenon. The transverse and longitudinal profiling device has the advantages of small load, small bending moment, uniform force and simple structure, can ensure uniform planting depth, improves planting quality, and realizes the requirement of transplanting in a dry land.

The invention provides a combined bracing structure for a foundation pit and a construction method thereof, relating to the combined bracing structure for the foundation pit and belonging to the technical field of geotechnical engineering. The combined bracing structure for the foundation pit comprises a cast-in-situ bored pile used as the bracing structure and a steel sheet pile used as a waterproof curtain, wherein a space truss structure is formed by the cast-in-situ bored pile and the steel sheet pile through an inner pile block ring beam, an outer pile block ring beam as well as inner and outer pile block connecting beams. The invention achieves the purposes of simple and fast construction, easy quality control, cycle use and high integral rigidity.

The invention provides a force measuring device for a wind tunnel test model. The force measuring device is fixed and installed with a rigid partition near the middle of the measured model, and the rigid partition is rigidly connected to the multi-component balance through bolts; the multi-component balance is rigidly connected to the balance support through bolts, and its plane size is the same as The balance is matched; the balance support is welded on the top of the steel pipe, and the other end of the steel pipe is welded to the base, and the base is connected to the foundation with bolts to fix the whole device. It is characterized in that the multi-component force measuring balance is placed in a suitable position inside the model and rigidly connected with the model, thereby reducing the cantilever length of the test model and making full use of the measuring range of the balance, thereby increasing the size of the model. The purpose of improving the test wind speed and test accuracy.