2results about How to "Compression adjustment" patented technology

The invention discloses a lower pipe seat of a fuel assembly. The lower pipe seat comprises a seat body and a base, the seat body comprises a tube seat plate and a plurality of supporting legs arranged below the tube seat plate and used for supporting the tube seat plate, the base comprises a base body and a plurality of connecting parts arranged on the base body, the connecting parts and the supporting legs are arranged correspondingly, and each connecting part is provided with a clamping groove corresponding to the corresponding supporting leg. According to the fuel assembly lower pipe base, the base is additionally arranged below the base body to increase the height of the fuel assembly in the free state, the compression amount of a fuel assembly pressing system is increased to compensate for the insufficient pressing force, the height of the fuel assembly in the free state can be adjusted by adjusting the height of the base, and therefore the compression amount of the fuel assembly pressing system is adjusted; and the pressing force requirements of fuel assemblies at different positions in the reactor core can be met. And meanwhile, the initial compression amount of the compression spring of the full-reactor-core fuel assembly is reduced, and the bending risk of the fuel assembly caused by too large pressing force of the fuel assembly can be effectively reduced.

This application discloses a composite waterproof structure for basement expansion joints, relating to the field of building expansion joint construction technology. It includes basement walls and expansion joints between the walls. A waterstop is installed along the length of the expansion joint on each wall between the expansion joints. Installation grooves are formed on both sides of the expansion joints along the length of the expansion joints. A cover plate is installed on the outer side of the expansion joint along the length of the expansion joint. Installation brackets are installed on the inner sidewalls of both installation grooves along the length of the expansion joint. The side of the installation bracket away from the expansion joint contacts the cover plate, and a connecting plate is installed on the side of the installation bracket closer to the expansion joint, connecting to the cover plate. A waterproof layer is provided between the installation bracket and the cover plate. The connecting plate pulls the cover plate against the installation bracket, and the waterproof layer waterproofs the gap between the cover plate and the installation bracket, minimizing the risk of the cover plate detaching from the expansion joint and allowing a large amount of water and debris to enter.