2results about How to "Safe and convenient construction" patented technology

This invention discloses a dual-effect concrete internal curing agent that combines shrinkage resistance and reinforcement, and its preparation method. Belonging to the field of building materials technology, the internal curing agent is composed of 100 parts phosphoric acid, 100 parts calcium hydroxide, 15-30 parts anionic or nonionic polyacrylamide, 20-30 parts sodium polyacrylate, 20-40 parts maleic anhydride (MA), 20-40 parts hydroxypropyl methylcellulose, 50 parts amorphous nano-silica particles with an average particle size of 20-50 nm, 5 parts defoamer, and 800 parts deionized water. In preparation, calcium hydroxide is first dissolved in water, then phosphoric acid is added and reacted at 60-80℃ until the pH value reaches 5.5-6.5. Then, nano-silica particles are added sequentially for dispersion, followed by HPMC and PAM, and stirring to obtain the final product. This invention effectively inhibits concrete shrinkage through the synergistic effect of organic polymers, inorganic minerals, and nanomaterials. The 60-day drying shrinkage rate is reduced by up to 77.25%, and the compressive strength is increased by 9.57%. As a water-based preparation, it can be directly incorporated into concrete and is suitable for natural curing in high-altitude and plateau regions.

The invention relates to a bearing structure with a wind-resistant support convenient to replace. The bearing structure comprises a bearing steel plate, a fixed steel plate, a pushing plate, bolts, a polytetrafluoroethylene sliding plate, steel balls and springs. The bearing steel plates are welded to a bridge tower and a main beam wind-resistant bracket respectively, the fixing steel plates are fastened to the bearing steel plates through bolts, and the pushing plates are welded to the edges of the bearing steel plates. And the teflon sliding plate is adhered to the inner side of the bearing steel plate. The bearing steel plate is drilled according to the diameter of the steel ball, the spring and the steel ball are installed, one end of the spring is welded in the hole of the bearing steel plate, and the other end is welded to the steel ball. The connection between the wind-resistant support and the bridge tower girder is optimized, so that the wind-resistant support is convenient to replace. The method is suitable for various types of basin type and ball steel wind-resistant supports and has good universality, meanwhile, the replacement difficulty of the wind-resistant supports is reduced, and construction safety and convenience are improved.