Investigation of Scouring Pattern Around the Axillary Screw Bridge in the Form of Pollen and Triangular Fish with their Observation and Comparison

Subject Areas : Water Resources

mahmmod valipour morghmaleki ¹ , mohsen solimani babarsad ²

1 - Azad University of Shoushtar Branch
2 - Assistant professor

Received: 2018-09-04 Accepted : 2018-11-20 Published : 2018-11-22

Keywords: Scouring, Bridge support, Laboratory model, Motion threshold, Triangular nose and pollen fish,

Abstract :

There are currently several methods to prevent scouring the bridge base. These methods can be divided into two general categories. The first group is to increase the strength of the substrate materials against erosion, such as the use of a gobion, a rap ramp around the bridges, and the second one, by changing the pattern of the flow around the bases, reduces the strength of the erosion factors, which are the collars, And bridge bridges are examples of these methods. In this research, the experimental study of the impact of the bridge nose bridge on the scour depth reduction was considered. For this purpose, 22 experiments were carried out in the vicinity of the pollen and triangular nests at four angles (0.70,75,80.90) 215/0, 232/0, 261/0). According to the results of the experiment, the reduction of scour depth in the triangular nose support for different floats in all angles had the best performance in reducing the scour depth during the experiments.