4657 results about "Jackscrew" patented technology

The invention discloses a force and acceleration composite sensor and an adjusting method, and belongs to the field of sensors. According to the technical scheme, the force and acceleration composite sensor comprises a sensor shell, an acceleration detection assembly comprises an acceleration detection core body, a first positioning face and a first pressing block are arranged in the sensor shell, the acceleration detection core body is located between the first positioning face and the first pressing block, and a screwing screw rod is arranged on the first pressing block; a first threaded hole is formed in the sensor shell, and the tightening screw is in threaded connection with the first threaded hole; the force detection assembly comprises a force detection core body, a second positioning surface and a second pressing block are further arranged in the sensor shell, the force detection core body is located between the second positioning surface and the second pressing block, and a jack assembly is arranged on the face, opposite to the force detection core body, of the second pressing block. According to the scheme, an adjustable pressing block structure is added, and adjustment of pre-pressure is achieved; and through the rigid connection mode of threaded connection, the springback phenomenon is avoided, and the pre-compression is more stable and accurate.

In one example, a pallet jack cap system includes a stabilization outrigger secured around steer wheels of a pallet jack, a bonnet in an elevated position over forks of the pallet jack, an anchor base for attachment to the pallet jack, and a vertical extension system between the anchor base and the bonnet. The vertical extension system supports the bonnet in the elevated position over the forks of the pallet jack. The vertical extension system can include an elevating vertical support assembly, an elastic counterpoise to assist with positioning the bonnet at a particular elevation based on an extension of the vertical support assembly, and an extension lock to secure the vertical support assembly at the particular elevation. The bonnet can be lowered down over a unit load on a pallet transported by the pallet jack, to secure the unit load and items in transport by the pallet jack.

The invention discloses a continuous rigid frame bridge construction monitoring method which comprises the following steps: before cantilever casting construction, arranging linear monitoring points along the longitudinal axis direction of a bridge according to the spacing of 8-12 meters, and respectively arranging stress monitoring points on a top plate and a bottom plate of the root section of each section; synchronously acquiring three-dimensional coordinate data of the linear monitoring points and real-time strain data of the stress monitoring points in the process of pouring each section in a cantilever manner; the collected linear data and stress data are input into a finite element model for collaborative analysis, and when a linear deviation value exceeds + / -5% of a designed pre-camber value and the deviation between a stress measured value and a theoretical calculation value exceeds + / -8%, an adjustment instruction is automatically generated; according to the adjusting instruction, the elevation of the front fulcrum of the hanging basket is adjusted through the hydraulic jack during construction of the next section; after initial setting of the adjusted segment concrete, linear data and stress data are collected, and the actually measured data and a finite element model prediction value are compared and verified. The method can help to guarantee the safety and durability of the continuous rigid frame bridge.

The invention belongs to the field of intelligent control systems, and particularly relates to a shield attitude real-time intelligent control method based on machine learning, according to the method, a data acquisition module can more comprehensively and accurately reflect the actual condition of shield construction, and in the control process, key parameters such as the working state of a jack and the pressure of a hydraulic system are monitored in real time, so that the control accuracy is improved. Abnormal conditions can be found in time, an emergency plan can be started, and the safety of shield construction is guaranteed. According to the real-time monitoring and feedback optimization mechanism, the safety and reliability of shield construction are effectively improved, and the construction risk is reduced.

The utility model relates to a wire feeding device for 3D printing, and solves the technical problem of how to enable a fiber printing mode of a spray head to be more stable and reliable in existing 3D printing equipment. The device comprises a vertical supporting plate, a driving roller driving motor, a roller shaft, a first synchronous belt wheel, a second synchronous belt wheel, a first synchronous belt, a driving roller, a driven roller, a jackscrew connecting block, a driven roller connecting block, a jackscrew, an extension spring and a feeding disc, the jackscrew connecting block is connected to the vertical supporting plate, and a sliding groove is formed in the jackscrew connecting block; the driven roller connecting block is located in a sliding groove of the jackscrew connecting block, the jackscrew is connected with an inner threaded hole of the jackscrew connecting block, the front end of the jackscrew abuts against the side face of the driven roller connecting block, the driven roller is rotationally connected with the driven roller connecting block, and one end of the extension spring is connected with the driven roller connecting block. The other end of the extension spring is connected with the jackscrew connecting block, and the driven roller is close to the driving roller. The 3D printer is widely applied to 3D printing equipment.

The invention discloses airplane wheel disassembly and assembly auxiliary equipment for civil aircraft maintenance, and relates to the technical field of tire maintenance devices.The airplane wheel disassembly and assembly auxiliary equipment comprises a traction frame body, a protruding part is inwards formed in the middle of the traction frame body, a first hydraulic jack is arranged on the protruding part, and a supporting frame is arranged at the output end of the first hydraulic jack; vertical supporting plates are arranged on the two sides of the supporting frame, combination plates are arranged on the vertical supporting plates on the two sides, transverse plates are arranged on the combination plates, supporting rods are symmetrically arranged on the transverse plates on the two sides respectively, and arc-shaped plates are arranged on the upper end faces of the supporting rods on the two sides. According to the lifting function of the airplane tire dismounting device, the airplane tire can be lifted upwards in the dismounting process, so that the gravity of the airplane tire cannot act on a fixing bolt, a user can conveniently take down the airplane tire, meanwhile, the airplane tire is rotated through cooperation of a groove-shaped structure, and therefore a worker can conveniently and rapidly maintain the state of the airplane tire.

This invention discloses a coal caving end support and coal caving method for a top coal caving face, comprising a support body, a net breaking device, and a roof breaking device. The support body includes a top beam and a base. The net breaking device includes a cantilever beam, a swing jack, a telescopic beam, a telescopic jack, and a cutter. The cantilever beam is rotatably connected to the top beam. The swing jack is connected between the top beam and the cantilever beam and is used to drive the cantilever beam to swing up and down. The telescopic beam is slidably mounted on the cantilever beam. The telescopic jack is connected between the cantilever beam and the telescopic beam and is used to drive the telescopic beam to slide relative to the cantilever beam. The cutter is located at the free end of the telescopic beam. The roof breaking device includes a column base, an impact column, and a column jack. The column base is connected to the rear of the base. The impact column is rotatably mounted on the column base. The column jack is connected between the column base and the impact column. The end support of this invention can realize net breaking and roof breaking operations in the triangular area of ​​the working face, avoiding large-area overhang situations caused by large lag in roof collapse.

A jack assembly that has a base member having a handle assembly extending therefrom, a remote control positioned in the handle assembly, a handle base section of the handle assembly that comprises a battery coupler and a control unit, an electric motor coupled to the base member and providing a torque to a gear assembly, the gear assembly coupled to a ball screw, a carriage slidably coupled to the base member, the carriage having a lift nut coupled thereto, the ball screw threaded through the lift nut such that rotation of the ball screw moves the lift nut, and carriage, linearly along the base member, and a lifting arm pivotally coupled to the carriage on one end and pivotally coupled to a pivot arm at an intermediate location.

The invention discloses a top coal caving working face coal caving end support and a coal caving method, the top coal caving working face coal caving end support comprises a support body, a net breaking device and a top breaking device, and the support body comprises a top beam and a base; the net breaking device comprises an outrigger, a swing jack, a telescopic beam, a telescopic jack and a cutter; the cantilever beam is rotationally connected with the top beam, the swing jack is connected between the top beam and the cantilever beam and used for driving the cantilever beam to swing up and down, the telescopic beam is slidably assembled on the cantilever beam, the telescopic jack is connected between the cantilever beam and the telescopic beam and used for driving the telescopic beam to slide relative to the cantilever beam, and the cutter is arranged at the free end of the telescopic beam. The top breaking device comprises a stand column base, an impact stand column and a stand column jack. The stand column seat is connected behind the base, the impact stand column is rotationally assembled on the stand column seat, and the stand column jack is connected between the stand column seat and the impact stand column. By means of the end support, net breaking and roof breaking operation of a triangular area of a working face can be achieved, and the conditions that the roof caving lagging amount is large, and large-area roof suspension occurs are avoided.

The invention discloses a test system and method for simulating multi-angle fault dislocation and tunnel-soil body interaction. The test system comprises a tunnel, a model box assembly, a sliding system and a loading system. The model box assembly is composed of a bottom plate, a side plate, a first end plate, a second end plate, a third end plate, a square steel pipe, a fan-shaped steel plate, a U-shaped steel plate, a circular steel pipe, a round steel bar, a hinge, a T-shaped steel bar, a bolt and a sliding groove. The sliding system is composed of universal balls, a sliding platform, a steel lantern ring and a U-shaped sliding groove. The loading system is composed of a vertical jack, a horizontal longitudinal jack, a horizontal transverse jack, a counter-force plate, a supporting plate, a steel bottom plate, foundation bolts and a tunnel model. According to the invention, a fault inclination angle in a range of 45-90 degrees can be set, and the influence of strike-slip, forward and reverse, oblique slip and other fault dislocations and three-dimensional fault dislocations on the overall structure stability of the tunnel can be simulated. The device is easy to manufacture, convenient to operate and high in safety.

The application provides a large-span bridge substructure vehicle-fire wind force real-time hybrid test platform and implementation method, the platform comprises a physical loading and transmission system, a T-shaped wind-fire coupling simulation system, a modularized prying integrated system, an intelligent control and calculation system and a multi-dimensional high-precision monitoring system. The method realizes real-time pre-test of the boundary displacement / force of the test piece through the construction of a numerical substructure fast calculation model based on LSTM and converts the boundary displacement / force into a loading instruction to drive the through core jack to realize thermal force coupling interactive loading; the T-shaped wind-fire coupling simulation system reproduces the real vehicle fire scene under the influence of the environmental wind. The test platform supports independent loading of any component of the cable system, can execute open space self-defined fire test and closed space standard fire test, and accurately analyzes the cable failure mode, critical temperature threshold and damage evolution law under fire through the multi-dimensional high-precision monitoring system, thereby providing a high-fidelity test platform and analysis method for fire resistance design of large-span bridges.

The invention provides PCB deviation detection equipment and a detection method, and relates to the technical field of PCB detection, a feeding arm and a carrying arm are matched with a partition adsorption and pressing assembly to be matched with a detection platform and a feeding platform, so that the problem of uneven adsorption of an FPC is effectively avoided; the detection platform adopts the adsorption assembly with adjustable spacing, and the levelness is accurately regulated and controlled by combining with the jackscrew adjusting piece, so that the detection platform can adapt to the layout of components on the back of the PCB to avoid interference, and can guarantee the bearing stability and eliminate the positioning deviation. Meanwhile, the detection method supports the combination of PCBs and FPCs with different characteristics in a terminal area, and by calculating X and Y bidirectional deviation values, the adaptive range is widened, the detection precision is improved, and the missing detection and false detection rate is reduced.

The invention provides a self-balancing device for preventing a cable from sliding off in the tensioning process of a super-long longitudinal cable and a construction method, the rear part of an extension rod is anchored through a temporary anchoring mechanism, and the rear end of the extension rod penetrates through the temporary anchoring mechanism and is pulled by a center hole type tensioning jack; the extension rod is further sleeved with an auxiliary traction mechanism in a fastening mode, and the front end of the auxiliary traction mechanism is connected to the cable body protection sleeve. The rear end of the auxiliary traction mechanism is connected to the temporary anchoring mechanism; the stay cable is further sleeved with an annular anti-clamping-falling buffer, the stay cable can move in the annular anti-clamping-falling buffer in the axial direction, and the outer side of the annular anti-clamping-falling buffer is detachably installed at the position, close to the cable inlet end, in the cable guide pipe. The invention aims to ensure the safety of the tensioning end of the stay cable in the initial tensioning process close to the bridge tower, prolong the service life of the extension rod, solve the risk that the rigid extension rod is easy to break or unstable in connection with the anchor cup to cause the falling of the stay cable, and ensure the safety and stability of the stay cable in the tensioning process.

A floating incremental launching and assembling method for a floating bridge, comprising the following steps: erecting an assembly jig (2) on land near the water; assembling a front-half main girder section (10) on the assembly jig (2); incrementally launching the front-half main girder section (10) forward until the front portion of the front-half main girder section (10) is suspended in the air; supporting the front end of the front-half main girder section (10) by using a temporary floating pier (3); continuing to incrementally launch the front-half main girder section (10) forward until a first pier column head (120) is exposed out of a lower step (20) of the assembly jig (2); completing mounting of a first permanent floating pier (1A); assembling a rear-half main girder section (10') on the assembly jig (2); incrementally launching the rear-half main girder section (10') forward until the position of a second pier column head (120) is exposed out of the lower step (20); completing mounting of a second permanent floating pier (1A'); continuing to incrementally launch the rear-half main girder section (10') forward until the tail portion of the rear-half main girder section (10') reaches the lower step (20); and lowering a step jack (29), such that the tail portion of the rear-half main girder section (10') is completely separated from the step jack (29).

The utility model discloses an electric hydraulic horizontal jack which is characterized in that a handle is also provided with a battery pack seat, and a battery pack wiring board electrically connected with a control circuit board and a battery pack electrically connected with the battery pack wiring board are arranged in the battery pack seat; the handle pipe and the pressing hand are further provided with aviation plugs used for conducting circuit communication while preliminarily connecting the handle pipe and the pressing hand. The handle assembly further comprises a threaded connecting sleeve arranged on the pressing hand and a nut preventing the male plug and the female plug from being easily disengaged. According to the utility model, the aviation plugs are arranged on the pressing handle and the handle tube, and the female plug and the male plug of the aviation plugs are respectively arranged on the handle tube and the pressing handle, so that the handle tube can be detached from the pressing handle when the jack is packaged, the packaging volume of the jack is reduced, and the transportation cost is reduced; and when the handle tube is mounted on the press handle during reuse, the male plug and the female plug are plugged to finish electric connection, and the press handle and the handle tube are simple, convenient and rapid to disassemble and assemble.

The invention relates to a heavy cover plate building machine which comprises truss girders arranged at intervals, and an overhead layer is formed between every two adjacent truss girders; the U-shaped frame is arranged between the truss girders, and the top surface of the U-shaped frame is lower than the top surfaces of the truss girders, so that a space for stacking templates is reserved; the gate-type supporting frame is mounted on the U-shaped frame in a sliding manner; the hydraulic jack is mounted on the U-shaped frame and is used for fixedly supporting the door-type supporting frame; the guide wheel moving assemblies are installed at the bottoms of the two ends of the truss girder. The track is laid below the guide wheel moving assembly; the unloading block is mounted on the bottom surface of the track; the latticed column is supported on the bottom surface of the unloading block below one end of the truss girder; the structural column embedded bracket is mounted on the side surface of the structural column and is supported on the bottom surface of the unloading block below the other end of the truss beam; the invention discloses a detachable formwork assembly. The construction efficiency of the concrete floor cover plate can be improved, and during slip form construction, the formworks are stacked in the empty space after being disassembled and can move to the next construction section in the direction perpendicular to the concrete beam.

The invention discloses an improved bridge pushing jack synchronous sliding device and method, and relates to the technical field of building construction auxiliary equipment. The improved bridge jacking jack synchronous sliding device comprises a jacking oil cylinder set, the jacking oil cylinder set comprises a forward-moving oil cylinder, the back face of the forward-moving oil cylinder is fixedly connected with a jacking oil cylinder, the top of the jacking oil cylinder is fixedly connected with a rotating supporting disc, the bottom of the forward-moving oil cylinder is fixedly connected with a transverse-moving compensation mechanism, and the transverse-moving compensation mechanism is fixedly connected with the rotating supporting disc. A transverse compensation sliding rail is slidably connected to the bottom of the transverse movement compensation mechanism, and deviation induction mechanisms are fixedly connected to the left side and the right side of the transverse compensation sliding rail correspondingly. According to the improved bridge jacking jack synchronous sliding device and method, by arranging the rotary supporting disc, the transverse movement compensation mechanism, the transverse compensation sliding rail and the deviation induction mechanism, the situation that the installation precision of a bridge is affected by sliding shoe clamping stagnation is prevented, and the installation precision of a bridge body is improved.

The invention discloses a hydraulic static automatic pile driver and aims to provide a hydraulic static automatic pile driver which is good in structural stability and capable of effectively solving the problem that a piston rod of a pile-embracing oil cylinder in the prior art is prone to distortion and deformation. The hydraulic static force automatic pile pressing machine can effectively solve the problem that in the pile pressing process, due to the fact that the holding force is insufficient, a pressed pile slips. The device comprises a reaction frame, a hydraulic jack and a pile embracing mechanism, the pile embracing mechanism comprises a pile embracing taper sleeve, an inner hole of the pile embracing taper sleeve is a taper hole, the hydraulic jack drives the pile embracing taper sleeve to ascend and descend, and the lower end of the pile embracing taper sleeve is connected with a bottom cover; the plurality of enclasping cone cores are arranged in the cone holes; the hydraulic elements are in one-to-one correspondence with the enclasping cone cores and comprise vertical piston cavities arranged in the corresponding enclasping cone cores; the locking piston is arranged in the vertical piston cavity and divides the vertical piston cavity into an upper cavity and a lower cavity, the lower end of the locking piston is connected with a piston rod, and the lower end of the piston rod can be connected to the bottom cover in a manner of moving in the radial direction of the conical hole.

The utility model relates to the field of track devices, and discloses a heavy-load trolley track device which comprises one or more track mechanisms. The rail mechanism comprises a bottom plate, a steel rail, a leveling assembly used for adjusting the vertical position of the steel rail and a straightening assembly used for adjusting the left-right position of the steel rail. The leveling assembly comprises a thick base plate, a thin base plate and an adjusting jackscrew. The upper surface and the lower surface of the bottom plate are horizontal planes and are fixed to a workbench or the ground. The thick base plate is fixed on the bottom plate, the thin base plate is arranged between the thick base plate and the bottom plate, and the adjusting jackscrew penetrates through and rotates on the thick base plate and is used for determining the compensation thickness of the thin base plate. The straightening assemblies are arranged on the two sides of the steel rail correspondingly. According to the utility model, the track can be quickly leveled and straightened, the mounting precision of the track is improved, and the problem that equipment is inconvenient to mount and rotate due to ground level fall is effectively solved.

The invention belongs to the technical field of bridge construction, and particularly relates to a single-point multiple-jack synchronous beam falling forced displacement method prestress applying method which comprises the steps that S1, a plurality of temporary supporting points are arranged beside a permanent support, and a self-locking type beam bearing mechanism is installed on each temporary supporting point; meanwhile, a hydraulic jack is arranged at each temporary supporting point, the multiple hydraulic jacks are connected to a PLC integrated hydraulic synchronous control system through hydraulic pipelines, and synchronous linkage mechanisms are arranged among the multiple hydraulic jacks. According to the single-point multiple-jack synchronous beam falling forced displacement method prestress applying method, when an inner jacking pipe sleeve pushes a supporting cushion block to ascend and descend, through meshing of a self-locking gear and two self-locking racks, a secondary telescopic block can be forcibly driven to move synchronously, so that continuous stretching and retracting of a bearing beam are achieved, the cushion block does not need to be manually replaced after single beam falling, and the working efficiency is improved. The system automatically adjusts the height to meet the multi-stroke circulating beam falling requirement, and the construction efficiency is improved.

The invention discloses a swivel bridge dynamic balance weight adjusting method which comprises a real-time weighing monitoring system, a balance weight adjusting system, a hydraulic traction device and a balance weight moving device, the balance weight moving device comprises a plurality of movable balance weights, a plurality of flat rail cars and rail car longitudinal moving rails, the movable balance weights are carried on the flat rail cars, and the movable balance weights are arranged on the flat rail cars. Every two adjacent movable balancing weights are connected through a connecting rope, the hydraulic traction device comprises two fixed balancing weights and two center hole jacks, the two fixed balancing weights are arranged at the two ends of the longitudinal track respectively, and the two center hole jacks are installed on the two fixed balancing weights respectively; the center hole jacks are connected with the adjacent end movable balancing weights, the balancing weight adjusting system calculates balancing weight distribution point positions and loading weight in real time according to monitoring data of the real-time weighing monitoring system, and the corresponding center hole jacks are controlled to pull the movable balancing weights. According to the invention, the dynamic counterweight adjustment of the swivel bridge can be realized before the bridge swivel construction or in the swivel process.

The utility model relates to the technical field of underground mining, and discloses a supporting shield type top coal caving hydraulic support which comprises a top beam, a stand column, a base, a shield beam, a four-bar mechanism and a coal caving mechanism, the coal caving mechanism comprises a tail beam which is hinged to the lower end of the shield beam and is of a box type structure, and a tail beam jack is arranged between the lower portion of the tail beam and the lower portion of the shield beam; an inserting plate which reciprocates along a guide rail guide groove is inserted into the tail beam box cavity, a rack is fixed to the end face of the tail end of the inserting plate, an integrated cover plate extending to the two sides of the inserting plate is installed on the lower portion of the tail end of the inserting plate, and a guide groove matched with the guide rail in the tail beam box cavity is formed in the lower portion of the inserting plate; side protection plates are installed on the two sides of the tail beam through tail beam side pushing jacks, each side protection plate comprises a side plate and a top plate which are vertically arranged, the top plates are located on the upper surface of the tail beam, and the side plates are installed on the outer side of the tail beam. According to the device, the stability and durability of the tail beam structure are improved; and the stress condition, the assembly relation and the structural performance of the bracket are improved.

The application relates to a combined device and method for vertical static load test of water anchor pile method. Two gantries are arranged at the two ends of a water bearing platform, a steel beam passes through the space of a to-be-tested foundation pile connecting assembly I and an anchor pile connecting assembly II in the shape of a Chinese character 'jing', and the two ends are respectively suspended below the cross beams of the gantries; the to-be-tested foundation pile connecting assembly I is arranged in the middle of the steel beam, two anchor pile connecting disc assemblies II are arranged at the two ends of the steel beam, the lower end surface of a connecting disc I of the to-be-tested foundation pile connecting assembly I and the lower end surface of a connecting disc II of the anchor pile connecting assembly II are located on the same horizontal plane; a pulling jack is arranged between an upper tensile small cross beam I of the to-be-tested foundation pile connecting assembly I and the steel beam; a compression jack is arranged between the steel beam and the connecting disc I of the to-be-tested foundation pile connecting assembly I; and a recording platform is arranged beside the to-be-tested foundation pile below the middle part of the steel beam. The application combines the compression and pulling static load test devices into one, can be easily converted, is quickly installed, and the test result is reliable.

The utility model discloses a steel box girder hoisting fine adjustment device which comprises a base, a jack is fixedly arranged on the upper surface of the base, a supporting assembly is fixedly arranged at the upper end of an ejector rod of the jack, supporting arms are arranged on the two adjacent side walls of the base respectively, the supporting arms are in an L shape, and air cylinders are fixedly arranged on the upper portions of long arms of the supporting arms. A piston rod of the air cylinder penetrates through the long arm of the supporting arm and extends to the position above the short arm of the supporting arm, and the piston rod is higher than the air cushion supporting assembly. According to the fine adjustment device for hoisting the steel box girder, the jack is arranged to adjust the height of the steel box girder, the air cushion supporting device, the supporting arm and the air cylinder are arranged to adjust the position of the steel box girder in the horizontal direction, so that the steel box girder is installed at a preset installation position, the installation precision is high, and the operation is convenient and fast.

A jack-mounted storage carrier allows a user to utilize the mechanical advantage of a manual camper jack, or a powered camper jack, to conveniently lift, lower, and stow a storage carrier and associated article(s) along the exterior of a vehicle or camper. The storage carrier is pivotable relative to the camper jack, and is vertically movable by the extendable post of the camper jack, so that the camper jack supports the storage carrier and allows or facilitates its movement between stowed and deployed positions. In the deployed position the stored article(s) may be rested proximate or along a ground surface that is also contacted by a foot of the camper jack, and in the stowed position the stored article(s) may be rested on a step or other support associated with the camper or vehicle.

The utility model relates to the technical field of locomotive traction motor disassembly and maintenance, in particular to a bearing seat withdrawing device which comprises a supporting rod arranged in the center of a bearing seat, a hollow jack is sleeved outside the supporting rod, and a connecting plate is installed on the end face of one end of the bearing seat. The connecting plate comprises a central mounting hole and mounting wing plates diverging outwards from the central mounting hole; an annular mounting arm protruding towards one side of the supporting rod is arranged at the end, away from the bearing seat, of the connecting plate and used for mounting a pulling plate, the pulling plate comprises a mounting end connected with the mounting arm and a stopping end arranged opposite to the mounting end, and the pulling plate surrounds the outer wall of the hollow jack; one end of the hollow jack extends into the mounting arm, and the other end is close to the inner wall of the stop end. According to the bearing seat withdrawing device, the manual high-intensity operation process is eliminated, and the health of staff is guaranteed; the tool is simple in structure, convenient to operate and relatively low in manufacturing cost; the bearing seat can be disassembled by one person, and the maintenance cost is reduced.

Disclosed is a top-driven jack, including an outer pipe, an inner pipe, a lead screw, a nut, a fixed part, and a handle; the inner pipe extends into the outer pipe; the nut is fixedly mounted on the inner pipe; the lead screw is movably mounted in the outer pipe through the fixed part and extends into the inner pipe, and is engaged with the nut; the fixed part includes a fixed seat and a movable sleeve; a connecting hole and an accommodating hole are formed in the movable sleeve; a connecting section is arranged at one end of the lead screw; the movable sleeve is movably connected with the fixed seat and embedded into the connecting hole through the connecting section and synchronously moves with the lead screw in the circumferential direction around the central line of the lead screw.

The invention relates to the technical field of foundation pit supports, in particular to a repeatable assembly type steel support for foundation pit construction, which comprises an extension steel support, a butt joint steel support, a main steel support, an axial force supplement steel support, two jacks and two steel enclosing purlins, the butt joint steel support is fixedly connected with the main steel support, and the axial force supplement steel support is slidably connected with the inner wall of the main steel support; the two ends of the axial force supplementing steel support and the two ends of the extension steel support are fixedly connected with the jacks respectively. The quick dismounting and mounting mechanism is arranged to be linked with the anti-deformation mechanism, the axis of the extension steel support is limited, and the situation that when the axial force is insufficient, the joint of the extension steel support and the butt joint steel support collapses due to the gravity effect is prevented. Meanwhile, the gravity direction of the steel support is changed through a fixing plate on the gravity compensation axial force mechanism, the gravity of the steel support acts on a hinged plate downwards all the time, then a sliding plate and the axial force compensation steel support are driven to abut against the foundation pit, the installation time is shortened through the design, and the self-weight influence of the steel support is effectively controlled.

The invention relates to a bridge abutment settlement deformation monitoring device and method, and belongs to the field of bridge monitoring, the bridge abutment settlement deformation monitoring device comprises two bearing frames arranged on one side of a bridge pier and a steel wire rope I arranged between the bearing frames and used for supporting a connecting support, and the top of the connecting support is provided with a monitoring mechanism; the monitoring mechanism comprises a plurality of piston cylinders adjustably arranged at the top of the connecting support, piston push rods are slidably arranged at the tops of the piston cylinders, extension rod pieces fixedly connected with the piston push rods are fixedly arranged on one side of the pier, and display sleeves are fixedly arranged on the two sides of the connecting support. The display sleeve is communicated with the piston cylinder body through a connecting pipeline and used for transmitting liquid prefabricated in the piston cylinder body, and a piston sliding block is arranged in the display sleeve in a sliding mode. The double steel wire ropes and the tension jack form an elastic supporting system to buffer vibration, the hydraulic linkage design converts tiny settlement into visual displacement, the spring reset mechanism is matched to improve data reliability, automatic reset is achieved, continuous monitoring is supported, and the monitoring range is expanded.

The invention relates to the application of the Internet of Things technology in the technical field of shield tunnel design, and discloses a shield tunnel segment circular seam full-scale loading test device and method based on the Internet of Things, and the device comprises a steel frame supporting assembly which is used for providing a supporting frame of the whole test device. Comprising a supporting bottom beam, stand columns, a counter-force top beam, a counter-force bottom beam, a cross beam and a tensile diagonal rod, the stand columns are located on the supporting bottom beam, the counter-force top beam is arranged between the stand columns, the counter-force bottom beam is a box-shaped beam and is provided with a plurality of holes along the axis, and rotating shafts and brake bolt pins are arranged in the holes. Through the synergistic effect of the positioning steel tank, the positioning jack, the angle sensor and other components, accurate horizontal positioning and bilateral symmetry adjustment of the test duct piece can be achieved, in the test process, the strip-shaped hole design of the positioning steel tank allows the transverse rib of the inverted-T-shaped steel beam to slide left and right along the strip-shaped hole, and the fine adjustment function of the positioning jack is matched; and the duct piece can be ensured to be positioned at an accurate horizontal position and be bilaterally symmetrical before being loaded.