Construction achievement in The USA
1.Introduction of Noval hammer substructure construction method
Noval hammer substructure construction method is one kind of downhole hammer method. And moreover it is just most evolved downhole hammer all over the World. In generally downhole hammer only adopts lifting air system, this system has best effectiveness in all rock soil condition and no resident districts. But If your doing construction place exists resident districts, suddenly appeared including big stones complexly soil condition and a lot of water springed from underground soils, or you need drill into water likely to Sea, lake, pond, basin and river, it would be difficult to complete at current time by using downhole hammer. Under such difficulty condition Noval Hammer just has best effectiveness because it belongs it's function of outside screw and coming out grout when it finish drilling.
2. Construction achievements in the USA
•East river dam