9 results about "Eccentric compression" patented technology

The application discloses a deep foundation pit inverted shaft wall excavation construction method under eccentric compression working condition, and is suitable for an asymmetric load scene in which the earth covering height of one side of a shaft is significantly greater than that of the other side. The method first carries out grouting on the outer periphery of the shaft wall below the present ground surface to form a soil reinforcement area; then a lock mouth ring beam is constructed at the shaft mouth, and an upper structure including a retaining wall, a counter pressure plate, a retaining wall ring beam and a plate brace is constructed upwardly on the ring beam; during the construction process, the earth covering side is simultaneously backfilled to the grading ground surface elevation; then the inverted shaft wall method is adopted to excavate downward in sections, after each excavation section, a circumferential arch frame, an angle brace and an anchor rod support are constructed, and upper and lower ring beams are arranged at the position of a horse head door and are connected with adjacent arch frames through vertical supports; finally, a concrete bottom sealing is constructed at the shaft completion surface. The application forms an anti-overturning moment through the counter pressure plate and the synchronous backfilling, and combines a multi-stage support system, so that the shaft wall instability problem caused by eccentric load is effectively solved.

This invention provides a data acquisition and processing method and system for axial and eccentric static load tests on ECC-strengthened concrete columns, belonging to the field of structural testing and data acquisition and processing technology. This method simultaneously acquires sensor data and image data, first identifying cracks and then performing data preprocessing. Furthermore, by using the crack information set and the installation position of each preset sensor, it dynamically generates axial and eccentric compression correction parameters, achieving refined correction of the initial stress information. This method effectively solves the shortcomings of traditional methods, such as the accidental deletion of key damage data and the lack of quantification of the impact of multiple microcracks, significantly improving the accuracy of test data and providing reliable support for the mechanical performance evaluation of ECC-strengthened concrete columns.

This invention relates to the stress design of lightweight ribbed insulated walls for prefabricated buildings, and discloses a method for calculating the eccentric compression bearing capacity of such walls. This method is implemented through four steps: "section equivalence—second-order effect correction—eccentric bearing capacity calculation—eccentricity limit and design process." First, the side panels, ribs, and edge members are equivalent to multi-ribbed composite sections with side flanges, establishing an effective flange width model that varies with slenderness ratio, rib spacing, number of ribs, and insulation layer thickness. Second, an expression for the stability coefficient explicitly incorporating eccentricity and rib arrangement parameters is proposed. Based on this, the formula for eccentric compression bearing capacity and the applicable eccentricity range are given, along with dimensionless lookup charts to enable rapid engineering design. This method systematically characterizes the composite stress and stability performance of lightweight ribbed insulated walls under eccentric compression, improving the safety and economy of the design.

This utility model discloses a pulse rotary cleaning device for cleaning carbon deposits inside cylinders, relating to the field of engine carbon cleaning. It includes a valve seat and a pulse rotary cleaning assembly. The pulse rotary cleaning assembly includes a guide pipe connected to the outlet end of the valve seat. The outlet end of the guide pipe is connected to an injection pipe via an injection pipe housing. The injection pipe is movably disposed within the injection pipe housing. One end of the injection pipe extending beyond the housing is the injection pipe head. One or more eccentric side injection ports are provided on the side of the injection pipe head. This device, through the eccentric side injection ports on the injection pipe, enables the injection pipe to rotate under the push of compressed air, simultaneously causing the compressed air to rotate and spray out in a fan-shaped pattern. Each sprayed fan-shaped area partially intersects, performing secondary cleaning and achieving 360° circumferential cleaning of the combustion chamber space. Furthermore, the vortex airflow generated by the eccentric compressed air flow through the eccentric injection ports blows away residues from the combustion chamber in all directions.

This invention discloses a method for analyzing axial and eccentric damage of steel-concrete composite columns based on acoustic emission. The key technical features include a frame; the frame is a rectangular structure with a counterweight mounted on it. Four sets of support columns are vertically mounted on the upper surface of the counterweight, and these four sets of support columns collectively support a four-position rotary motor. Four sets of steel-concrete composite column positioning mechanisms are arranged around the center of the upper surface of the rotating platform. By setting up four sets of steel-concrete composite column positioning mechanisms and four-position rotary motors, continuous detection of multiple steel-concrete composite columns can be achieved, effectively improving detection efficiency. The steel-concrete composite column positioning mechanisms, through the coordination of adjusting bolts, clamps, and sliding grooves, can adapt to steel-concrete composite columns of different sizes, ensuring firm and convenient positioning. The acoustic emission vibration detection equipment and acoustic emission detection module can accurately capture the acoustic emission signals of the steel-concrete composite column under axial and eccentric pressure.

This invention belongs to the field of experimental technology for eccentrically compressed components, specifically relating to an eccentrically compressed loading device for steel lattice columns and its loading method. It includes a test bench, with an upper loading component fixed to the upper end of the test bench. The upper loading component is fixedly connected to a vertical reaction frame via a constraint component. The upper loading component includes a loading box component, with a steel sleeve structure externally disposed on the loading box component. The steel sleeve structure is fixedly connected to the side wall of the actuator cylinder via turnbuckles. A hydraulic actuator and an eccentric structure are disposed between the actuator cylinder and the steel sleeve structure. This invention closely matches the boundary conditions and stress state of eccentrically compressed steel lattice columns with rigid column bases and hinged column tops in actual engineering. It effectively solves the problems of localized damage to the steel column head and the tendency for overall in-plane lateral displacement of steel lattice columns during eccentric loading. It exhibits strong experimental stability, convenient installation, and simple operation, and can meet the requirements for eccentric loading devices for other types of large-size steel components.

This invention belongs to the technical field of spring testing equipment, specifically relating to a high-stress spring fatigue testing device, including a base and a gantry frame. The top of the base is provided with a worktable suitable for placing the spring. The gantry frame is located on top of the base, and a testing rod is provided on the side of the gantry frame facing the worktable. A lifting mechanism is provided between the testing rod and the gantry frame. The top of the worktable has two opposing movable plates, and a scrap bin is opened on the middle surface of the worktable. Both movable plates cover the top opening of the scrap bin. The purpose is to provide a sleeve for the spring to be fitted, and with the cooperation of the sleeve cavity inside the testing rod and the pressure ring at the opening, the top of the sleeve can be inserted into the sleeve cavity, ensuring the coaxiality of the testing rod and the sleeve, achieving precise alignment of the spring and the testing rod without manual alignment, simplifying the operation process, and avoiding test deviations caused by eccentric compression, thus improving the accuracy of the test results.

The application discloses an engineering concrete compressive strength detection device, which comprises a detection main body framework, a compressive strength detection device body and a mounting rack arranged on one side of the compressive strength detection device body, a hydraulic pressure device is fixedly installed at the top of the mounting rack, a placing base is fixedly arranged at the bottom of the mounting rack, the placing base and the output end of the hydraulic pressure device are arranged in vertical opposition, and the placing base is configured to cooperate with the hydraulic pressure device to load and compressively test a test block; and a leveling mechanism is fixedly assembled at the output end of the hydraulic pressure device. The independent pressing plate arranged in an array in the leveling mechanism cooperates with a ball joint and a ball socket, can automatically adapt to the microscopic concave-convex surface or the inclination angle of the top surface of the concrete test block, converts the rigid point contact or the line contact in the traditional detection into the full-coverage uniform surface contact, effectively eliminates the stress concentration and the eccentric compression phenomenon caused by the uneven surface of the test block, and ensures that the obtained compressive strength data can truly reflect the intrinsic strength of the material.