2 results about "Longitudinal contraction" patented technology

A device and method for controlling cracks in ultra-long concrete slab structures are disclosed. The device includes an anti-buoyancy anchor rod, a container, a moving block, a smooth rod section, and a limiting block. The method includes the steps of assembling the device, anchoring the anchor rod, welding the device to the reinforcing cage, and pouring foundation slab concrete. Based on relevant data on concrete shrinkage, this invention pre-sets a container, a moving block, and a smooth rod section on the rod that can simultaneously satisfy the longitudinal and horizontal shrinkage ranges of concrete. As horizontal and longitudinal shrinkage occurs, the concrete of the foundation slab causes the container to undergo horizontal and longitudinal displacement. At this time, the moving block slides upward on the smooth rod section, simultaneously releasing the constraint force on the foundation slab in the horizontal and longitudinal directions. Since the rod does not hinder the shrinkage deformation of the concrete, cracks caused by the constraint force of the anchor rod will not occur.

This utility model discloses a wall longitudinal contraction joint edge-sealing device, belonging to the field of contraction joint technology. Its key technical features include two longitudinal wall bodies, with a water-stopping mechanism positioned between opposite sides of the two longitudinal wall bodies. A decorative cover body is positioned on the front side of each longitudinal wall body, and pulling mechanisms are positioned at the top and bottom of the rear side of the decorative cover body. The water-stopping mechanism includes four screws, two fixing frames, a water-stopping strip body, and two protrusions. The surface of the water-stopping strip body contacts the inner wall of the fixing frames. This solves the problem that in existing longitudinal wall contraction joint edge-sealing devices, the water-stopping strip, after installation, directly and tightly contacts the edge of the longitudinal wall. The rough and sharp edges of the wall can easily cause localized pressure damage to the rubber water-stopping strip, affecting the waterproofing effect. Furthermore, it is inconvenient to open the decorative cover, making it difficult to replace the aged water-stopping strip after long-term use.