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Study on the Navigation Influence with Bridge Span and Distance at Bridge Group Reach of Mountainous Rivers

Author: ChenMing
Tutor: ChenMingDong
School: Chongqing Jiaotong University
Course: Port, Coastal and Offshore Engineering
Keywords: Bridge group Flow model Small -scale ship model Bridge span Bridge spacing
CLC: U442.54
Type: Master's thesis
Year: 2010
Downloads: 51
Quote: 2
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Abstract


With the national sustainable development strategies continue to depth and steady development of the national economy, especially on the transportation demand of water transport will greatly increase. At the same time, the development of land transport speed of bridge construction there will be continued growth. In some river bridges the number increased rapidly, especially in the bridge site resources are increasingly scarce urban river, continue to decrease due to the spacing of the bridge is easy to form a bridge group, in addition to the water transport demand has become the greater, and thus greatly increase the difficulty of ships traveling on the bridge group reaches the inevitable increase in average accident,. Therefore a timely manner of the bridge group navigable problems related research is necessary. According the reservoir legend reaches of Yangtze River Bridge to Shibanpo river regime conditions, as well as navigation environment, this river reach (bridge group reaches) half takes into the mountain rivers typical straight Microbend river. Navigable flow conditions, as well as the ship sailed conditions by using a combination of two-dimensional numerical simulation of flow and small-scale physical model of the ship test to study in detail the different combinations of the reach of the bridge group bridge spacing and bridge span. Draw on a typical mountain river the straight the microbending bridge group reaches: Bridge pitch constant and only changes proposed bridge bridge span bridge across the river channel direction of the flow field in the navigable waters affected by smaller degree, when the bridge span increased to 340m, flow rate and flow angle change is not obvious, the flow rate change values ??remained at about 0.05m / s, the the water angle between the change in the value of the basic 0.8 °; bridge spans the same , the smaller the bridge spacing, the maximum flow rate of the affected area is greater, when the bridge across the two bridges are about 160m bridge spacing of 300m, compared to other conditions, the formation of the maximum flow rate of the broadest area. When navigable hole wrong hole layout, the ship's maneuverability is more sensitive to different combinations of the bridge span and bridge spacing, which: ① When the bridge across the two bridges are about 160m Bridge pitch in less than 900m, and should not be adjacent to the construction of a bridge, the bridge The spacing of 1200m more reasonable; ② When the bridge spacing to 600m, the basic bridge bridge span is about 160m proposed bridge across the following 280m, and should not be adjacent to the construction of a bridge, bridge span increase is more reasonable to 340m. This paper not only provides an effective method for the study of the mountain river bridge group reach on the bridge spacing and bridge cross between the impact, can provide important reference for bridge design departments to optimize the layout of the construction of a bridge pier adjacent, but also drivers of inland vessels sailing on the bridge group reaches a certain method of operation.

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CLC: > Transportation > Road transport > Bridges and Culverts > Investigation, design and calculation > Bridge Design > Designed to compare the program , the selected bridge
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