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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
Inactive Publication Date: 2020-10-30
TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
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However, there is no method for determining the effective navigation clear width of the inclined bridge, which makes the planning and design of the inclined bridge lack of basis
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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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Abstract
The invention discloses a geometric relationship-based skew bridge navigation effective navigation net width determination method, and the method is calculated by adopting the following formula: l = B-C or E, and the two values are taken as large values, wherein l is the effective navigation net width, B is the actual navigation net width, C is the anti-collision facility occupation width, E is the pier turbulence width, and C/E is the large value. When the skew bridge is a forward bridge, the actual navigation net width is calculated by adopting the following formula: B = (L-b-a * tan(alpha))* cos(alpha); when the skew bridge is a skew bridge, the actual navigation net width is calculated by adopting the following formula: B = (L-b) * cos(alpha), wherein L represents the span, b represents the width of a pier or a bridge column, a represents the length of the pier or the bridge column, and alpha represents the included angle between the water flow direction and the normal direction of the bridge axis. Plane arrangement of the bridge is combined with water flow navigation and river channel conditions of the bridge area, a basis is provided for planning and designing of the skew bridge, the effective navigation clear width can be obtained in the bridge design stage, and therefore, the bridge navigation design scheme is optimized, and ship navigation safety of the water area ofthe bridge area is guaranteed.
Description
technical field [0001] The invention relates to the field of water transportation, in particular to a method for determining the effective navigation clear width of inclined bridges based on geometric relationships. Background technique [0002] The foundation of water transportation is the waterway, which is an important public welfare transportation infrastructure of the country and is a limited non-renewable resource. As of the end of 2018, the navigable mileage of inland waterways nationwide was 127,100 kilometers, ranking first in the world, with 66,400 kilometers of inland waterway grades, of which 13,500 kilometers were third-grade and above waterways, basically formed with the Yangtze River trunk line, Xijiang shipping trunk line, Beijing-Hangzhou Canal, The waterway network of the Heilongjiang River System, the Yangtze River Delta and the Pearl River Delta is a waterway network with direct branches and rivers and seas as the backbone. With the development of waterw...
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