49results about How to "Improve tensioning efficiency" patented technology

The invention relates to a method for reinforcing a bonded prestressing force of a transversely tensioning epoxy coating reinforcing steel bar of a concrete beam slab, which relates to the reinforcement of reinforced concrete and prestressed concrete bridges and is suitable for the reinforcement of house buildings and other building structures. In a prestressing force reinforcing technique of the invention, a novel transversely tensioning corrosion-resistant epoxy coating reinforcing steel bar is used for substituting for a longitudinally tensioning high-strength steel strand or common hot-rolled reinforcing steel bar and a transversely clamping device is used for substituting transverse tensioning for longitudinal tensioning, so that low-cost composite mortar or concrete can be used for substituting for high-cost high-performance tensile composite mortar or polymer mortar to perform a structure treatment and construction process, and the problems of low utilization efficiency of materials, high reinforcing cost and inconvenient reinforcing construction are solved.

The invention discloses a support-free overhead zip line construction method of a two-way single-layer cable net structure. An overhead zip line manner is adopted for sequentially installing track cables and stabilization cables, middle nuts and end nuts are arranged on high-strength bolts, and cable clamps are fastened twice in the achieving process for clamping the track cables and the stabilization cables correspondingly. The method includes the steps that firstly, the track cables are straightly expanded on the ground, bottom boards and middle boards of the cable clamps are installed and fastened, and the track cables are sequentially installed at the designed positions through guide cables and traction cables to be connected with and anchored to outer pressing rings; and then the stabilization cables are straightly expanded on the ground, catwalks are laid on the installed track cables in the directions of the stabilization cables, the stabilization cables are dragged to the overhead catwalks to be expanded, top boards of the cable clamps are installed and fastened, the stabilization cables are tensioned to be connected with and anchored to the outer pressing rings, and therefore the structure is tensioned and formed. By the adoption of the method, no support or large-area work face is needed, main equipment and tools are used in a circulating manner, and the input is small; inhaul cables run overhead, and protection is easy; and construction is easy and convenient, efficiency is high, the measure cost is low, and a construction period is short.

The invention provides the stay cable tensioning technology, and relates to a tensioning device for a stay cable which is provided with a single-lug or double-lug sleeve and can be adjusted in one direction or two directions and a construction method of the device. The tensioning device comprises a prefabricated lower clamping base, fastening bolts, a tensioning steel strand, a prefabricated upper clamping base, front-clamping type hydraulic jacks, a core-through load sensor and a sensor data collecting system, wherein an extrusion and anchoring end socket is arranged at one end of the tensioning steel strand. By means of the tensioning device for the stay cable and the construction method of the tensioning device, cable tensioning can be effectively finished, the two front-clamping type hydraulic jacks symmetrically tension the stay cable so that the device can bear stress evenly, the hydraulic jacks are controlled through readings of jack oil pressure gauges and the core-through load sensor, and errors can be reduced. The whole device is easy to manufacture and convenient to operate, and has high practical value and popularization value.

The invention provides a reaction frame for stretching a pre-stress anchor rope of a steel wire rope. The reaction frame comprises a movable transverse beam (5), a tensioning hydraulic jack (8), a fixed transverse beam (9), a guide reaction stand column (7) and an adjusting mechanism, wherein the movable transverse beam (5) can be connected and fixed with an inserting section of a steel wire rope anchor rope (19); the tensioning hydraulic jack (8) is connected with the movable transverse beam (5); the fixed transverse beam (9) is used for supporting the tensioning hydraulic jack (8); the fixed transverse beam (9) is connected with the tensioning hydraulic jack (8); the tensioning hydraulic jack (8) enables the movable transverse beam (5) to get close or be far away relative to the fixed transverse beam (9); the guide reaction stand column (7) is connected with the fixed transverse beam (9); the adjusting mechanism can be used for adjusting the position, relative to one end or the other end of the guide reaction stand column (7), of the fixed transverse beam (9). The reaction frame for stretching the pre-stress anchor rope of the steel wire rope has the characteristics of rapid installation speed, synchronization of the jack, capability of adjusting the position of the jack through a hydraulic system, accurate stretching force and accurate elongation amount, and low manual labor intensity in a stretching process and the like.

The invention discloses an exerting device for I-beam prestressing. The exerting device for I-beam prestressing is characterized in that two-way tension mechanisms arranged in flanges on both sides ofan I-beam are included, upper steel stranded wires and lower steel stranded wires are arranged in each side flange of the I-beam, and the two ends of the upper and lower steel stranded wires are correspondingly and fixedly connected with the corresponding two ends of the I-beam. The two-way tension mechanisms comprise upper sleeves, lower sleeves, connection sleeves, upper drawing blocks, lower drawing blocks and brackets. The brackets are vertically fixed between the upper and lower flanges of the I-beam, the upper sleeves and the lower sleeves vertically sleeve the brackets, the upper drawing blocks are spirally connected with the upper threads of the upper sleeves, and the lower drawing blocks are spirally connected with the lower threads of the lower sleeves. The upper steel strand wires are connected with the upper drawing blocks, the lower steel strand wires are connected with the lower drawing blocks, self-locking mechanisms are arranged on the upper sleeves and the lower sleeves, and the connecting sleeves are used for connecting the upper sleeves and the lower sleeves. The exerting device for I-beam prestressing has the advantages of flexible use, good seismic-proof performance and can be applied to different using sites.

The embodiment of the invention provides a synchronous belt tensioning device and system, relates to the synchronous belt tensioning technology, and aims at overcoming the defects that in the relatedtechnologies, the synchronous belt tensioning force error controllability is poor, and time consumed for adjusting the synchronous belt tensioning force is long. The synchronous belt tensioning devicecomprises a positioning installing frame, a drive motor arranged on the positioning installing frame, a sliding assembly which is connected with the output end of the drive motor and is arranged on the positioning installing frame in a sliding manner, and a measuring unit arranged on the sliding assembly and used for detecting the tensioning force of a synchronous belt, wherein the sliding assembly is used for driving an input synchronous belt wheel and a motor set to move relative to an output synchronous belt wheel and an output wheel set, and accordingly the tensioning force of the synchronous belt connected to the input synchronous belt wheel, the motor set, the output synchronous belt wheel and the output wheel set can be adjusted.

The invention relates to stretching equipment for bridge vertical rebar. The stretching equipment comprises a stretching device, a walking device and a power and hydraulic device. The stretching device is installed on a bridge top plate and comprises a pair of support bases, a support hydraulic rod, a hydraulic-rod support disk, a stretch hydraulic rod, a stretching platform and a steel lever component, wherein the pair of support bases are disposed in the width direction of the bridge top-plate top surface, the support hydraulic rod is vertically fixed on the top of the support bases, the hydraulic-rod support disk is vertically fixed on the upper end of the support hydraulic rod, the stretch hydraulic rod is vertically fixed on the top of the hydraulic-rod support disk, the stretching platform is installed in the middle portion of the stretch hydraulic rod, and the steel lever component is disposed on the stretching platform. The walking device is disposed on the bridge top plate and at one side of the walking device, and comprises a walking frame, universal wheels and a plate. The power and hydraulic device is mounted on the walking device and comprises a hydraulic device, a storage battery and a display. The stretching equipment for the bridge vertical rebar has the advantages of convenient operation, good controllability and high stretching efficiency, and can achieve mechanical stretching of the vertical rebar, replace manual labor, guarantee tension prestress quality, thereby saving construction cost.

The invention discloses a pre-stressed steel frame for exerting pre-stress by a support displacement method and a fabrication method of the pre-stressed steel frame. The pre-stressed steel frame comprises a girder and two edge posts fixedly connected with the girder; a central cylinder is also arranged between the two edge posts; a gap G is reserved between an upper end face of the central cylinder and a bottom surface of the girder; a combined connection plate is respectively fixedly connected with left and right sides of the middle of a lower end of the central cylinder; the bottom surface of the girder corresponding to the upper end face of the central cylinder is vertically fixedly connected with the connection plate corresponding to the combined connection plate; an inhaul cable is arranged between the combined connection plate and the connection plate; one end of the inhaul cable is hooked with the connection plate; the other end penetrates through a hole arranged on the combined connection plate to be mutually clamped with a center hole jack arranged below the combined connection plate; the gap G is removed by a traction effect of the center hole jack, and contact and fixed connection of the upper end face of the central cylinder and the bottom surface of the girder are achieved. The pre-stress is exerted to the steel frame by a support displacement method principle; internal force distribution is uniformly adjusted; a structural material is saved; and the pre-stressed steel frame is convenient to operate and suitable for a multi-storey steel frame structure with more than two spans.

The invention discloses a rapid tensioning device of screen cloth of a vibrating screen. The rapid tensioning device comprises a tensioning bolt (1), an end face cam (2), a stress sleeve (3), a rotary head (4), a flat washer (15), an adjusting nut (12) and a locking nut (13). The rotary head (4) is rotated to adjust the axial position of the tensioning bolt (1), so that the screen cloth (20) is tensioned and released. The rapid tensioning device has the advantages of being compact in structure and high in tensioning efficiency of the screen cloth of the vibrating screen, and reducing labor amount of workers.

The invention discloses a horizontal overhead tensioning device for motor rotor conducting bars, which comprises a machine body base, supporting and rotating mechanisms, an axial movement mechanism and a rolling mechanism, wherein the supporting and rotating mechanisms are arranged on two sides of the surface of the machine body base and used for horizontally supporting and circumferentially rotating a rotor workpiece, the axial movement mechanism is arranged on the surface of the machine body base and used for driving the supporting and rotating mechanism to drive the rotor workpiece to movein the axial direction in a reciprocating mode, and the rolling mechanism is erected on the machine body base, positioned above the supporting position of the rotor workpiece and used for being tightly abutted against each conducting bar on the rotor workpiece so as to enable the conducting bars to be tensioned in iron core grooves through reciprocating rolling. The device disclosed by the invention provides horizontal support and circumferential rotation driving for the rotor workpiece through the supporting and rotating mechanisms, enables the rotor workpiece and the rolling mechanism to form relative reciprocating movement by using the axial movement mechanism, and enables the rolling mechanism to perform rolling and tensioning on the conducting bars one by one, so that the tensioning efficiency of the motor rotor conducting bars is improved, the uniform and consistent tensioning degree and the uniform and continuous tensioning deformation of the conducting bars are ensured, and thepotential safety hazards are eliminated.

The invention relates to a horizontal curve prestress device of a hollow large cantilever structure. The horizontal curve prestress device arranged above a neutral axis of the hollow large cantilever structure comprises a horizontal curved cable, straight cables, annular cable clamp nodes, straight cable clamp nodes, inclined cable clamp nodes and tension end nodes; and the horizontal curve prestress device is characterized in that the horizontal curved cable is a non-closed curve, two ends of the horizontal curved cable are connected with the straight cables, the straight cables are arranged in the tangential direction of the end points of the horizontal curved cable and extend to the non-cantilever position of the hollow large cantilever structure from the end points of the curved cable, the tension end nodes are arranged to be connected with the hollow large cantilever structure, the curved cable is provided with the annular cable clamp nodes to be connected with the hollow large cantilever structure, the straight cables are provided with the straight cable clamping nodes to be connected with the hollow large cantilever structure, the inclined cable clamping nodes are arranged at the intersection points of the straight cables and the curved cable and are connected with the hollow large cantilever structure, the straight cables and the curved cable can slide in the cable clamp nodes in the tensioning process, the annular cable clamp nodes, the straight cable clamp nodes and the inclined cable clamp nodes are welded with the hollow large cantilever structure without relative deformation, and the tensioning end nodes are arranged at the end points of the straight cables.

The invention discloses a horizontal side-arranged tensioning device for motor rotor conducting bars, which comprises a machine body base, a supporting and rotating mechanism, axial movement mechanisms, rolling mechanisms and an auxiliary pressing mechanism, wherein the supporting and rotating mechanisms are arranged at two sides of the surface of the machine body base and used for horizontally supporting and circumferentially rotating a rotor workpiece, the axial movement mechanism is used for driving the supporting and rotating mechanisms to drive the rotor workpiece to move in the axial direction in a reciprocating mode, the rolling mechanisms are erected on the machine body base, positioned at two radial sides of the rotor workpiece and used for being tightly abutted against each conducting bar on the rotor workpiece so as to enable the conducting bars to be tensioned in iron core grooves through reciprocating rolling, and the auxiliary pressing mechanism is erected on the machinebody base and used for pressing the surface of the rotor workpiece so as to prevent the rotor workpiece from generating radial or axial runout in the reciprocating movement process. The device disclosed by the invention can improve the tensioning efficiency of the motor rotor conducting bars, prevent the rotor from generating axial or radial runout, ensure the uniform and consistent tensioning degree and uniform and continuous tensioning deformation of each conducting bar and eliminate the potential safety hazards caused by a tensioning punch in the tensioning operation process.