Passenger Use Bailey Bridge Design Plan
Jul 11, 2022
Case design requirements:
| A temporary bridge needs to be built for cross-river diversion. |
| The service life is 4-5 months. |
| The preliminary estimate is that the length of the temporary bridge is 200m. |
| The Bearing capacity is 5t for the Yellow Sea passenger, limited to 45 people. |
| The maximum static load is 10t. |
In the design, it is calculated based on the concentrated load of 40t. |
At an altitude of 1145m, there are four seasons of water in the river, and the amount is not large, the geological conditions are not clear. |
The effective driving width of the bridge is 7m, pedestrians on both sides are 1m each, and the total width of the bridge is 9m. |
This bridge is only for passenger use. The bridge deck is paved with planks. The river has no navigation requirements. |
Structural form and construction method
The bridge deck has a net width of 9 meters and is a double lane. The foundation adopts the steel pipe pile foundation, each pier adopts 6 or 4 Φ800×8 steel pipes with a length of 12m, with three piers in each row. A scissor support connection is provided between the steel pipes. There is a slot on the top of the steel pipe. Install distribution longitudinal beams, and distribute distribution beams on the longitudinal beams.
The 8-span bridge is 24m in span, and the beam part adopts reinforced four-row single-layer Bailey truss.The steel pipe pile is driven by the pile foundation , and the vibrating pile hammer is used to sink it.
The use of a crane should also consider whether the crane transfer on site is convenient). In order to ensure that the stress of Bailey truss members is within the allowable range during the dragging process, it should be pushed from both sides to the mid-span.Close mid-span, because this bridge has two curves, it should be smooth transition, the angle can be enlarged, and speed limit
Load (calculated by half-width bridge deck)
Weight of Bailey truss: 24m double row and single layer (including bridge deck) P1=21. 5t
Distribution beam weight 4 Pile pier distribution beam I50×6100 P2=93.6×6.1=571kg
4 Pile pier distribution longitudinal beam 2 I50×3200 P3=2×93. 6×3. 2=599kg
Steel pipe pile weight Steel pipe pile area A=π /4 (802-78.42) =199cm2
The weight of the pier is P4=3.9×4=15.6t
Material
1) Bailey truss: 10. 75t×4×8=344t
2) I50 (571+1198) ×8=14152kg≈14.2t
3) Steel pipe pile 3. 9×(8×8) =249. 6t
4) Steel pipe pile, scissor bracing steel 4t
