Prestress Anchor Ribbed Beam Support Technology

"Prestress Anchor Ribbed Beam Support System" is a new practical support technology which came from Soil Nailing Walls system and un-embedded rank of piles with anchors support system that has been used successfully for 4 years by the author and his company named Qingdao Deep Foundation Stabilization Engineering Co., Ltd. It' s mechanism is similar to rank of piles with anchors support system that can not be inserted into the bottom of foundation trench, but it' s ribbed beams are used to replace rank of piles made before excavation so the work cycle can be shortened and the support system cost can be reduced; Meanwhile this system maintains the Soil Nailing Wall' s convenience of digging and supporting.All principles of computer on deep foundation trench that are involved in 《Technical Specification for Retaining and Protection of Building Foundation Excavations》 in effect and all foundation books are about soil trenches . Deep foundation trenches in shallow rocks in some cities along a seashore like Qingdao, Dalian, Zhuhai things like that often need to be dug or exploded into hard rock, there are heaving sand, soft soil, groundwater upon it. It is difficult to make the piles in row or diaphragms into hard rock.. How to build this kind of foundation trenches ? Soil Nailing Walls can ensure the stability of some trenches but the horizontal displacement is too large to satisfy the needs of building or concealed work' s security. How to reduce the displacement of the soil nailing wall system? It is the "Prestress Anchor Ribbed Beam Support System" that gave a new practical support system to both of them. We can say that it can develop the usage of Soil Nailing Wall fill the rank of piles disadvantage a bright future of developing and using.The development, application, advantage and disadvantage about the"Prestress Anchor Ribbed Beam Support System" is introduced in Chapter 1:It' s supporting mechanism and structural feature is introduced and compared with the Soil Nailing Walls and un-embedded rank of piles in Chapter 2; Design and computer steps and more details about the design methods of the support system are introduced in Chapter 3; The two important parts named draperies and anchors are introduced on their construction technology in Chapter 4; Three foundation trenches' instances with different depth in different soil are showed in the last Chapter 5.This is the first time that the author wrote down the technology to be a thesis for his post-graduate degree. The author hopes geotechnical professors and experts to research and develop this support system far because initial surveying dates are too limited and the theory is too simple. That the calculation method must be superficial. It is a kind of practical technology so the author gave more details in this thesis to introduce it' s design, construction and some project instances to make the article practical and valuable.The company the author worked in is applying a practical patent for the "Prestress Anchor Ribbed Beam Support System" . So far this technology is still a technical and commercial secret. So there is a special announcement here, this thesis is only offered to professors for examination , So any copy and spread to the same project companies is not allowed, the author gave a gratefulness to the professors who hold this thesis here.The author hoped professors give some precious advices for the thesis and this technology to develop it.