The Main Principles Of Replacing the Counterweight Trunnion Bearings in a Strauss

The main girder cast in C55 concrete is n-shaped in sample. The width of the primary girder is 27. 5 m. Poyanghu Bridge was built and opened to traffic in 2000. However, in  Answers Shown Here , 2019, its administrative staff identified damages in both the downstream side and the upstream side bearings organized on top of the auxiliary piers.

Their tensile capacity is 3300 KN, and compressive capability is 4200 KN. The size of the broken bearings is 150 cm 112 cm. The rotation angle limit is 0. 02 rad, and the longitudinal and the transverse displacement limitations are 15 cm and 2 cm, respectively, for the bearings. The cross-section view of a bearing is revealed in Figure 3.

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Besides, transverse displacement was observed for the main girder near the downstream side bearing. For the upstream side bearing, 2 anchoring bolts broke (Figure 4(b)). Based upon engineering experiences, the administrative personnel believed that the mechanical state of Poyanghu Bridge was unsafe at that time. If the bearings were not fixed in time, the security and the serviceability of the whole bridge might be endangered.

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An Unbiased View of Bridge Bearing Replacement Procedure

They are reported as follows. Repair work plan 1 is a two-level repair plan, which relies on the tensioning of the steel strands. The 1st level of repair is an emergency rescue practice, which makes use of the 4 X-shaped steel strands arranged near the bearings tensioned with 1000 k, N force each to quickly reinforce the stability of the structure (Figure 5(a)).

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6 meter long steel channel members with the dimension shown in Figures 5(b) and 5(c) organized on two sides of the bridge piers by planting enhancing bars at the height of 1 meter below the capping beam. For that reason, the repair work practice may trigger the damage of the piers at the connections of X-shaped steels.

Their cross section location is 16. 69 cm2; their weight per unit length is 13. 1 kg/m; their external diameter is 6. 1 cm; their breaking force is 2620 k, N; and their strength is 1570 Mpa. The second level of repair is a repair practice in its true sense, which utilizes eight vertical steel strands tensioned with 2000 k, N force each to place correctly the main girder in relation to the bearings to help with the repair work of the bearings (Figures 5(d) and 5(e)).