38results about How to "Force analysis is simple" patented technology

The invention discloses a prefabricated bearing platform mounting method and relates to the field of bridge construction. The prefabricated bearing platform mounting method comprises the following steps that a bearing platform and bottom pier bodies are prefabricated in a prefabrication field, and steel pile hole positions are reserved in the bearing platform; the bearing platform is lifted to a pile site by a large floating crane; a pile top guiding device is pre-mounted on steel piles in the pile site before the bearing platform is lifted; after the bearing platform is lifted down and is in place, a carrying pole is arranged on a pile top longitudinal direction adjusting position in a hanging manner, and the horizontal plane of the bearing platform is regulated as required; and the pouring of bottom-sealing concrete of a steel cylinder cofferdam, the water pumping, the binding of reserved hole steel reinforcing bars, and the pouring of reserved hole concrete at non-lifting points and lifting points are sequentially finished, and the steel cylinder cofferdam is detached, so that the mounting of the prefabricated bearing platform is finished. According to the prefabricated bearing platform mounting method disclosed by the invention, a small steel cylinder cofferdam replaces a large bearing platform steel cofferdam, so that the steel material can be effectively saved, the on-water operation time is shortened, and the construction cost is reduced; and meanwhile, the influence of water flow to the construction of the bearing platform is reduced, and the construction quality of the bearing platform is ensured.

The invention discloses a periodontal ligament stress analysis method and device. The method comprises the following steps: 1, obtaining geometric models of a digital tooth model, a digital periodontal ligament model and a digital alveolar bone model; selecting the types of constitutive models of the three models to form a digital dental model; selecting boundary conditions of the digital dental model to obtain a digital dental finite element model and carrying out nonlinear finite element calculation, and obtaining stress distribution data of the digital periodontal ligament model so as to verify the consistency of the digital tooth model with a simulated correction target when the digital tooth model is rearranged. Whether alveolar bone reconstruction is caused by bone resorption or bonedeposition of the alveolar bone under the conditions that alveolar jaw changes in pose and/or bears load can be accurately judged; the constitutive models closer to periodontal ligament characteristics are selected by utilizing the geometric models closer to the actual situation in the mouth of a patient, so that the calculated stress distribution data is closer to the actual situation, and a data basis is provided for design, preparation and inspection of subsequent dental instruments.

The invention discloses a rope type guided directional impact device for a dynamic test of an energy dissipater of a rock fall protection system. The device comprises a test block, lifting equipment,a pulling cable, counterforce piles, force sensors, test specimens of the energy dissipater of the rock fall protection system, directional ropes and a foundation pit. The test block is used for rockfall simulation; the lifting equipment is used for lifting and releasing the test block; the pulling cable is used for transferring impact force; the counterforce piles are used for mounting the testspecimens of the energy dissipater of the rock fall protection system; the force sensors are used for data acquisition; the directional ropes are used for guiding the test specimens; the foundation pit is used for providing a buffer space for an impact test and plays a role in protection; the counterforce piles are vertically arranged on two sides of the foundation pit. The device can be constructed at a nearby site, a test site is not limited by an onsite environment, carrying testing equipment to a steep cliff in each-time testing is avoided, and accordingly each-time testing cost can be effectively reduced, operating efficiency is improved, and reusability is realized.

The invention discloses a force analysis tool for facilitating mechanics courses. The tool includes a circular plate, a trefoil plate, a connecting block, a square bar, a T-shaped circular table, a motor, an arc iron bar, a first laser lamp head, a fixing frame, a second laser lamp head, a U-shaped block, an indicator bar, an annular magnet, a square magnet, a threaded rod, a strip through hole, astrip sliding groove, a sliding block, a first switch, a second switch, a circular cover plate, a cylindrical groove and a button battery. The tool is advantaged in that design is novel, the tool iseasy to use the red linear light to mark the force direction and saves the time for a physics teacher for freehand drawing analysis, the structure is reasonable, the reciprocating structural functionis added, intuitive force analysis of an object is facilitated, understanding the force of the object in the moving process is facilitated, operation is convenient, and adjustment to the correspondingtilting angle and understanding the relative horizontal tilting angle are facilitated.

The invention discloses a confined concrete combination column. The confined concrete combination column comprises square steel pipe columns, U-shaped steel pipe columns, L-shaped steel pipe columns and concrete columns. One square steel pipe column serves as a benchmark column, the U-shaped steel pipe columns are sequentially welded along the adjacent edges of each benchmark column, the L-shaped steel pipe columns are sequentially welded along the adjacent edges of each U-shaped steel pipe column, and a steel pipe bundle is formed; and all the square steel pipe columns of each steel pipe bundle are filled with concrete finally, so that the confined concrete combination column is formed. According to the confined concrete combination column, the defect that the ductility and the energy-dissipating capacity of a traditional reinforced concrete column are poor is overcome; meanwhile, the steel pipe concrete section form is improved, so that the bearing capacity of the confined concrete combination column is greatly improved, and the application range of the confined concrete combination column is greatly expanded; construction is convenient; the seismic resistance of the column is greatly improved; and the confined concrete combination column is suitable for being applied to high-rise buildings and buildings in areas high in seismic intensity.

The invention discloses a centripetal force experimental device. The centripetal force experimental device comprises a base, a rotating disc, a controller, a rotating motor, a photoelectric door, a tension sensor, a pressure sensor, a sphere and a flexible rope without elasticity, wherein a central shaft is arranged at the center of the rotating disc; the rotating motor is used for driving the rotating disc to rotate; a limit slot is arranged on the rotating disc; the center shaft is sleeved with the tension sensor; a pull ring of the tension sensor faces the limit slot; a limiting ring is arranged in the limit slot; the flexible rope penetrates through the limiting ring and is connected with the pull ring and the sphere; the center of the pull ring, the center of the limiting ring and the center of the sphere are located on the same horizontal line, and the horizontal line penetrates through the center of the center shaft; the pressure sensor is annularly arranged on the inner wall of the limiting ring; a straight rod is arranged at the bottom of the rotating disc; and the photoelectric door is used for monitoring rotation of the straight rod. The invention relates to the technical field of physics experimental equipment, and aims to solve the technical problems that an existing centripetal force demonstration experiment is not visual, has large errors, and cannot obtain experiment data.

The invention discloses a multilayered stereo park with a detachable movable aluminium alloy frame. The multilayered stereo park includes a frame structure produced by aluminium alloy squeezing profiles; the frame structure is internally divided into at least three layers in the vertical direction and the width of each layer can accommodate at least three vehicle carrying units; the number of thevehicle carrying units arranged in other layers except the top layer is at least one less than the maximum accommodating number of the corresponding layer; the vehicle carrying units can freely translate in the horizontal direction and vehicle bearing plates are hung below the vehicle carrying units; and the vehicle bearing plates can rise or decline relative to the vehicle carrying units. The defects of corrosion and poor durability and weather fastness of steel of a traditional steel structure park, troublesome maintaining during use and high cost of the traditional steel structure park in the prior art are overcome; the technical problems that the top layer and the bottom layer of the existing steel structure stereo park are non-protective, disassembly is not convenient and recycle of materials is not achieved are solved; and vehicles can directly achieve the parking or taking of the vehicles by combining of horizontal moving and vertical moving.