1£¬The calculation of the error, in the installation of the expansion joint device when the temperature and other external factors not take into account the impact of the selection device is not based on the consideration of other factors.
2, the progress of the project does not have a strict implementation of the construction standards and construction procedures.
3, the welding quality between the pre embedded tendons and anchor tendons can not meet the requirements.
4£¬Concrete and other construction materials are not tight after the bridge expansion joints, and the strength is not up to the requirements of the design. The strong impact of the vehicle can not be met.
5, the two sides of the telescopic device and the asphalt concrete surface is not a good combination, the roller is not in place, a long time will appear off the phenomenon, which led to the expansion of the device was destroyed.
6, the early protection of the maintenance work is not in place.