Geometric relationship-based skew bridge navigation effective navigation clear width determination method
A technology of geometric relationship and determination method, applied in geometric CAD, special data processing applications, etc., can solve problems such as lack of basis for planning and design of inclined bridges
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Embodiment 1
[0016] see figure 1 , the inclined bridge is an upright bridge, and the direction of the pier is the same as the direction of the bridge axis. For the upright inclined bridge, the actual navigable clear width is:
[0017] B=(L-b-a×tanα)×cosα (1)
[0018] Among them, B refers to the actual navigable clear width, L refers to the span, b is the width of the bridge pier or bridge column, a is the length of the bridge pier or bridge column, a and b need to be determined according to the relationship between the height of the pier column and the navigable water level, when the top surface of the bridge pier When the elevation is greater than the design minimum navigable water level minus the draft of the representative ship type, b is the width of the bridge pier, and a is the length of the bridge pier. Column length, α is the angle between the water flow direction and the normal direction of the bridge axis.
[0019] The effective navigable clear width is:
[0020] l=B-C or E (b...
Embodiment 2
[0023] It can be seen from Example 1 that the effective net width is greatly reduced under the inclined bridge situation. In order to increase the navigation clear width of the bridge, under the inclined bridge situation, the piers sit obliquely, even if the direction of the piers forms an angle with the bridge axis, making the pier The trend is the same as the water flow direction, and the effective clear width can be increased. At this time, the actual navigable clear width and the effective navigable clear width are respectively:
[0024] B=(L-b)×cos α (3)
[0025] l=B-C or E (both take the larger value) (4)
[0026] In the present invention, the pier turbulence width is calculated using the existing method:
[0027] E=0.88K S V 0.75 b 0.56 h 0.44
[0028] In the formula: K S is a parameter related to pier shape, dimensionless, and 1.2 for rectangular pier;
[0029] V is the water flow velocity in front of the pier;
[0030] h is the water depth near the pier.
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