The original design of the new bridge lock triangle door adopts the upper, middle and lower three hinges to support the fixed gate, which is over the positioning device and generates redundant constraints in the direction of the vertical hinge axis. The concrete surrounding the pre-embedded pad of the bearing seat is broken, and the motor detection current is 712A. Compared with other gates, it can be known that the excess constraint of the left gate of the lower gate has been alleviated by the damage of the bolts, so it can be judged that the over-positioning device is caused. The main reason for the breakage of the triangular door bolt. At the same time, it was found through bolt material inspection that the pre-embedded bolts were made of 1Cr13 stainless steel. The hardness value of the material was large, the toughness and cold-change ability were poor, and it was easy to produce large welding stress during the installation process.
During the installation and installation of the triangular door, the determination of the spatial position of the hinge is an important part of the installation process of the gate. Usually, the spatial position of the hinge is determined based on the base of the bottom pivot, and the tolerance of the hinge concentricity is less than 2 mm. The deformation detection data is found (see, the displacement and concentricity units in the table are mm; the angle is the degree, and the counterclockwise direction is positive). When the gate is initially installed, the concentricity error is large, and the left gate of the lower gate reaches 819 mm>210 mm.
From the measured curve of the dynamic stress of the gate, the dynamic stress of the boom near the door hinge is about twice the dynamic stress of the boom at the joint of the main longitudinal beam, indicating that there is a large frictional resistance near the door hinge.
The dynamic stress detection curve of the arm is analyzed from the detection result of the opening and closing force of the gate, the maximum opening force of the left gate of the upper and lower gates and the right gate of the lower gate, and the gate opening force and the closing force of the gate under the measured condition It should be roughly equal. Therefore, in addition to the frictional resistance, there are other factors that affect the opening and closing force of the gate. Combined with the detection results of the gate deformation, the factors affecting the opening and closing force of the gate may also be the difference between the upper, middle and lower support shafts of the gate. Or the gate is not straight.
In summary, the installation accuracy is an important factor affecting the change of the stress state of the gate, and it is the direct cause of the increase of the stress of the bolts of the pre-embedded bolts and the door pivot support of the pier support. In the operation management, the water damage of the underwater part of the gate is not easy to repair in time, and the water leakage of different water level combinations on the upstream and downstream of the gate is likely to cause the gate vibration.
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