2results about How to "Stability Guarantee" patented technology

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.

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.