两性欧美-两性色午夜免费视频-两性视频久久-两性视频那里搜-两性视频网-两性视频网站

In traditional stone wall design based on research and development of new technologies stone walls - modular stone walls. The structure of the system through the rational design and construction, so that the stone plate independent of each other, they can always remove and install, the stone walls are easy to maintain; through the rational arrangement of the number and location of connection points, changing the stone plate surface force model, the stone walls system more secure, but can be applied to large-size stone walls and plates designed to reduce the thickness of slate; double sealed design, stone wall construction in the cold winter, most of the country is suitable for construction seasons. The system is based on a horizontal and a vertical sub-grid sub-grid as the basic unit, the general section about 1m2 in size, light weight, easy installation, and has the advantages of modular stone walls. Attached to the keel box production and on-site installation can be performed simultaneously, reasonable arrangements for operation plan, can greatly shorten the construction period.