79results about How to "Lower working environment" patented technology

The invention discloses a full assembly wallboard connecting structure of a shearing wall. The full assembly wallboard connecting structure comprises prefabricated hollow shearing walls and prefabricated hollow floor slabs, wherein the two adjacent prefabricated hollow shearing walls in vertical arrangement are connected by adopting a grouting sleeve, shearing wall longitudinal bars of the prefabricated hollow shearing walls positioned at the lower part extend into the grouting sleeves of the prefabricated hollow shearing walls positioned at the upper part, a 10-20 mm grouting seam is preserved between the two prefabricated hollow shearing walls in vertical arrangement, the prefabricated hollow floor slabs are connected with the prefabricated hollow shearing walls through a hard frame formwork, the prefabricated hollow floor slabs are in lap joint on the board end of the hard frame support mold, the lap joint length is 3 to 5cm, ring beam steel bars are arranged between the prefabricated hollow floor slabs and the prefabricated hollow shearing walls, in addition, the lap joint of U-shaped thrown bars or side surface thrown bars of the prefabricated hollow floor slabs is completed, and concrete is cast at node cast-in-situ regions. The full assembly wallboard connecting structure has the advantages that the dead weight of the structure can be greatly lightened, the earthquake force effect is reduced, the cost is reduced, the consumption of building materials is reduced, and the effects of energy saving, emission reduction and construction period saving are reached.

The invention discloses ultralow-temperature metal passivation phosphorizing liquid and a preparation method thereof. The ultralow-temperature metal passivation phosphorizing liquid comprises the following components in concentration by mass: 100-300 g / L of phosphoric acid, 2-18 g / L of tartaric acid, 2-10 g / L of sodium chlorate, 3-10 g / L of dihydric phosphate, 1-6 g / L of hexafluorotitanic acid, 2-8 g / L of ammonium citrate, 1-6 g / L of triethanolamine, 2-10 g / L of surface active agent, 3-12 g / L of molybdate, 8-20 g / L of waterborne polyurethane, and 2-5 g / L of m-xylylenediamine. The phosphorizing liquid contains no such harmful substances as chromate and nitrite, can reduce the working temperature of high-acidity phosphorizing liquid to 0-20 DEG C, needs no heating, saves a lot of energy, simplifies procedures, and shortens the production period. The phosphorizing liquid has special advantages on metal surface phosphorizing below 10 DEG C, is excellent in film forming performance, and reaches indoor rust preventing period of not less than one year.