5results about How to "Stability Guarantee" patented technology

The utility model belongs to the technical field of clamps, and particularly relates to a steel structure welding clamp which comprises a supporting seat, two symmetrically-arranged movable grooves are formed in the top of the supporting seat, different-direction moving plates are slidably mounted in the two movable grooves, the moving directions of the two different-direction moving plates are opposite, and the upper ends of the different-direction moving plates stretch out of the movable grooves; and clamping cylinders are rotationally mounted on the parts, located outside the movable grooves, of the different-direction moving plates, and the two clamping cylinders are arranged at the same height. In the welding process, a working motor enables a second rotating rod to rotate through meshing transmission of a first bevel gear and a second bevel gear, and enables a first rotating rod to rotate synchronously under connection of a cross-shaped sliding rod, and then two circular gears drive two ring gears to rotate respectively so that a fixed steel pipe can rotate by a certain angle. And different positions of a welding area can be conveniently operated, the welding quality is guaranteed, and the efficiency is improved.

This utility model relates to the field of construction safety technology and discloses a maintenance device for a large-span bridge railing with a folding ladder and protective railing. The device includes a ladder, a folding hanging ladder, a protective cage, and a support assembly. The folding hanging ladder is installed at the top of the ladder and can be folded to fit the ladder when not in use, reducing its size. When in use, it is unfolded to support the railing, providing stable transition support for climbing. The protective cage is fixed to the side of the ladder with bolts, forming a ring-shaped protective structure to prevent falls. The support assembly contains multiple evenly arranged support platforms, which are automatically retracted via connecting rollers, assembly cylinders, and coil springs. Normally, the coil springs keep the support platforms close to the ladder; when in use, stepping on a support platform overcomes the spring force to unfold it, and a limiting platform prevents excessive flipping, ensuring stable support and providing a place for maintenance personnel to stop and operate. All components are foldable and detachable, saving manpower and resources for transportation. Installation only requires unfolding and fixing; it occupies little space when not in use and can be flexibly transferred to different bridges, adapting to the maintenance needs of multi-span bridges. This improves convenience and safety.

The invention relates to the technical field of building materials, in particular to solid waste wave-absorbing concrete aggregate, a preparation method and concrete.The solid waste wave-absorbing concrete aggregate is prepared from, by weight, 18%-22% of coal gangue, 4%-6% of lithium slag, 8%-12% of steel slag with the particle size ranging from 0 mm to 5 mm, 17%-23% of steel slag which is subjected to hydrophobic treatment and has the particle size ranging from 5 mm to 10 mm and 40%-50% of steel slag which is subjected to carbonization treatment and has the particle size ranging from 10 mm to 20 mm. According to the aggregate, the preparation method and the concrete, the problem of poor stability can be effectively solved, and the concrete is higher in strength and better in wave absorbing performance.

The invention relates to novel cement prepared by recycling waste residues and a preparation method thereof, and relates to the technical field of waste residue recycling, the novel cement comprises the following components by mass: 30-50 parts of composite modified waste residues, 3-5 parts of modified polyvinyl alcohol fiber, 30-50 parts of cement clinker, and 0.5-1.5 parts of a water reducer; the composite modified waste residue is prepared from the following raw materials: composite waste residue, an ion-doped mineralizer and a composite excitant. The preparation method comprises the following steps: mixing the composite modified waste residue and the water reducing agent, stirring, adding the cement clinker, carrying out dry mixing, adding the modified polyvinyl alcohol fiber, and stirring to obtain the novel cement prepared by recovering the waste residue. The cement has the effect of improving the early strength performance of the novel cement prepared by recycling the waste residues, and the cement has good compressive strength and stability.

This invention relates to the field of concrete performance testing, specifically disclosing a device and method for testing the crack resistance of concrete during production. The device includes a mold with a pressure-applying component above it. The pressure-applying component applies downward pressure to the top of a solidified concrete block within the mold. The mold includes a frame and a base plate. A crack inducer is installed on the base plate. The frame and base plate can move vertically and horizontally, allowing the base plate to extend above the frame, thus ejecting the concrete block. A top plate is located above the mold, with an adjusting block slidably mounted in the middle of the top plate. The sliding direction of the adjusting block is perpendicular to the crack inducer and located in the middle of the crack inducer. The pressure-applying component is installed in the middle of the adjusting block. Clamps are installed at both ends of the top plate to hold the concrete block. This invention overcomes the limitations of existing testing devices and evaluation systems that are disconnected. By integrating early cracking tests and later mechanical loading functions on the same equipment, it achieves continuous evaluation of concrete under the coupled effects of internal and external stresses.