Abstract:Since the founding of China, China's bridge construction has been a rapid development, tens of thousands of bridges to make the moat into the road. However, in the many completed bridges, there are many bridges have insufficient bearing capacity phenomenon. This situation is caused by many reasons, such as: the old bridge original design standard is low, can not adapt to the current traffic flow and model changes; highway reconstruction bridge failed to synchronize the transformation, so that the "road new bridge old"; bridge materials, construction quality; lack of attention to the maintenance of bridges ...... and so on. But no matter what, these problems of the bridge if not timely maintenance, reinforcement, strengthening, will certainly affect the traffic conditions in China, resulting in traffic hazards, and even cause the loss of people's lives and property. OVM Newsletter" published in this issue of the Liuzhou City Construction Machinery General Factory in the old bridge reinforcement of two articles, in order to bring similar projects to provide some reference!

Abstract:

Abstract:The main bridge of Yabunsha Bridge adopts 76m+360m+76m three-span continuous self-anchored steel pipe concrete arch bridge to cross the Pearl River South Channel.

Abstract:This paper introduces the structure of Shufumiao Reservoir Bridge prestressed concrete continuous rigid structure, structural calculation characteristics, deep water foundation construction program selection.

Abstract:This paper introduces the Three Gorges permanent locks steel trestle bridge in vitro pre-stressing construction technology, practice has proved that pre-stressing anchorage in the steel structure project has the advantages of reliability, safety, cost economy, construction simplicity and short construction period, etc., which is worth popularizing and applying.

Abstract:Powder spraying system directly affects the quality of powder spraying piles, this paper introduces the composition and function of powder spraying system of RSF37-5 powder spraying pile driver, as well as the safety protection measures of large and small ash tanks in powder spraying system.

Abstract:The main bridge of Chongqing Wanzhou Bridge is designed as a steel pipe concrete truss continuous rigid girder, which adopts unidirectional, multi-point decentralized, automatic continuous thrusting construction method. The jacking equipment adopts YDCLD automatic continuous jacking system, which is simple in operation and control, fast in speed, and improves the stress state of flexible pier in construction.