7results about How to "Improve pull resistance" patented technology

The invention discloses an abrupt slope mountain photovoltaic micro pile foundation construction method under complex geological conditions, and relates to the technical field of photovoltaic foundation construction. According to the method, in order to solve the problems that the slope of the abrupt-slope mountain land is large, the terrain is complex, large machines are difficult to operate, and the ecological environment is sensitive, the structural form of small-diameter pile groups and chamfered triangular bearing platforms is adopted, the heavy-load unmanned aerial vehicle hoisting technology is combined, and minimally invasive, efficient and green construction is achieved. The core of the method comprises the steps of construction preparation, measurement positioning, hole forming, reinforcement cage and bearing platform reinforcement installation, material transportation based on the heavy-load unmanned aerial vehicle, concrete pouring, maintenance and the like. The method is high in environmental adaptability, capable of overcoming 15-45-degree abrupt slopes and complex geological conditions and greatly reducing earth excavation and vegetation damage, high in structural bearing capacity and low in manufacturing cost, solves the problems that a traditional construction method is low in efficiency, serious in ecological damage and the like, and is suitable for mountain photovoltaic power station projects, particularly suitable for photovoltaic foundation construction of ecological sensitive areas.

The invention provides a preparation method and use of modified polyvinyl alcohol polyurethane, the method comprises the following steps: (1) mixing nano cellulose, chitosan and polyvinyl alcohol, and carrying out a cross-linking reaction under the action of a cross-linking agent to prepare modified polyvinyl alcohol; (2) carrying out a reaction on polyether glycol and diisocyanate to prepare a prepolymer, and carrying out a reaction on the prepolymer and a chain extender to prepare a polyurethane solution; and (3) mixing the modified polyvinyl alcohol, a polyurethane solution and a sophora flavescens extract, and reacting to obtain the modified polyvinyl alcohol type polyurethane. The material can be used for preparing condoms, has good pull resistance and antibacterial property, not only improves the safety and performance of products, but also meets the requirements of environmental protection and health.

This invention relates to the field of precast concrete wall panels, and discloses a mortise and tenon joint type precast concrete wall panel and its forming method. The invention includes a wall panel body, a tenon structure, a mortise and tenon groove structure, and a reinforcing steel skeleton. The tenon structure and the mortise and tenon groove structure are integrally formed on opposite sides of the wall panel body, and their shapes and dimensions are compatible. A reinforcing steel skeleton is provided inside the wall panel body. The integral formation of the tenon and mortise and tenon groove into the wall panel body allows for wall panel splicing without additional connectors, making installation convenient. The compatible shape and dimensions ensure precise splicing, and the reinforcing steel skeleton provides overall load-bearing strength to the wall panel, preventing damage during hoisting and transportation, thus balancing connection stability and structural safety.

The utility model discloses a data line with a tensile structure, which belongs to the technical field of electronic accessories and comprises a metal terminal used for being connected with the outside to transmit data and supply power, and a connector shell used for protecting an internal conductive part is mounted at the end part of the metal terminal. The end, away from the metal terminal, of the connector shell is connected with a connector tail transition sleeve used for dispersing stress during plugging and bending, and insulated wires used for data transmission and power supply are installed in the connector shell and the connector tail transition sleeve. The data line can effectively bear main axial tension of a line body, prevents the insulated wires from being fractured due to tensile force, greatly prolongs the service life, is particularly suitable for use scenes which are frequently moved and are easy to pull, and can be widely applied to the field of data transmission. And the tensile property of the wire body is obviously improved.

The utility model discloses an assembled safety crawling ladder for a wind power tower drum, and belongs to the technical field of auxiliary operation and maintenance equipment for the wind power tower drum. The device comprises two side baffles, a foot rest lever is mounted between the side baffles; an anti-falling guide rail is mounted on the front side of the foot rest lever; a plurality of groups of through holes are formed in the corresponding positions of the two side baffles; the two ends of the foot rest lever are inserted into the through holes; a pressure bearing shaft is mounted in the foot rest lever; positioning clamping plates are mounted on the two end sides of the pressure bearing shaft; the other end of the positioning clamping plate is connected to a wall connecting piece on the inner wall of the tower drum; the upper and lower end sides of the side baffle plate are respectively provided with a plug with a positioning hole and a socket; the upper and lower adjacent side baffles are mounted through bolt assemblies; a plurality of strip-shaped holes are formed in the back of the anti-falling guide rail; the upper and lower adjacent anti-falling guide rails are detachably connected through a connecting plate; the utility model solves the problems that the connection between the current assembly type safety crawling ladder and the tower drum is not reliable enough, and the overall structure is not stable enough.

The invention discloses a sidewalk limited area profile steel cantilever bridge based on space optimization and a construction method thereof, and belongs to the technical field of cantilever sidewalk construction.The sidewalk limited area profile steel cantilever bridge comprises cantilever units arranged in the longitudinal direction of a road, and each cantilever unit comprises a profile steel main beam arranged in the transverse direction; an anchoring section of the profile steel main beam is arranged in a road structure and is wrapped by concrete to form a concrete anchoring body, a reinforcement cage is arranged on the outer side of the anchoring section, the reinforcement cage is integrally embedded in the concrete anchoring body, and bending moment and shearing force generated by a cantilever section of the profile steel main beam form a multi-path collaborative stress system through the profile steel main beam and the reinforcement cage. And the load is transmitted to the original road structure, so that the safe overhanging arrangement of the sidewalk is realized under the condition that a lower foundation does not need to be arranged. The problems that under the condition that the construction space of a sidewalk is limited, especially in areas close to rivers, valleys and other areas with limited space, the difficulty is large, and the manufacturing cost is high when a concrete structure is constructed from the valley bottom are solved.

The utility model relates to the technical field of steel structures, in particular to a circular tube steel column structure which comprises an upper circular tube steel column and a lower circular tube steel column which are vertically and coaxially arranged, the opposite end faces of the upper circular tube steel column and the lower circular tube steel column are arranged at intervals, and restraining assemblies are installed on the peripheries of the adjacent ends of the upper circular tube steel column and the lower circular tube steel column. The upper end of the restraining assembly is fixedly connected to the outer side wall of the lower end of the upper circular pipe steel column in a sleeving mode, a double-end locking part is arranged in the restraining assembly, and an anti-dislocation reinforcing layer used for reinforcing the double-end locking part is arranged in the inner space of the restraining assembly. Through the design of the restraining assembly, the double-end locking piece and the anti-dislocation reinforcing layer, high-strength connection between the upper circular pipe steel column and the lower circular pipe steel column is achieved, the pulling resistance and shearing resistance of the connecting part are greatly improved, and the overall stability and reliability of the steel structure are effectively enhanced.