Construction quality defects of reinforced concrete box channel

Uploaded on: 2015-05-14 14:01:54 come from: water conservancy project / Water conservancy project data / Water conservancy quality control

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In the construction process of reinforced concrete box channel, if the concrete construction is not carefully organized and strictly controlled, it is easy to have cracks on the side wall, exposed reinforcement, exposed stone, honeycomb, pockmarks and other defects at the corner between the wall body and the bottom plate, which affect the structural safety. The influencing factors include: temperature stress, quality of raw materials, uneven settlement of foundation, unstable formwork support, insufficient structural reinforcement, insufficient thickness of reinforcement protective layer, improper concrete mix ratio, and failure of concrete vibration and curing to meet the requirements. How to eliminate the quality defects to the maximum extent and ensure the safety of the project structure is an urgent task for the project management personnel. This paper discusses the cause and prevention of quality defects of reinforced concrete box based on the actual work.

Construction quality defects of reinforced concrete box channel - Figure 1

Construction quality defects of reinforced concrete box channel - Figure 2

Construction quality defects of reinforced concrete box channel - Figure 3

Construction quality defects of reinforced concrete box channel - Figure 4

Construction quality defects of reinforced concrete box channel - Figure 5

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Design points:

（1） The internal force of box culvert is calculated according to the overall closed frame. The top and bottom plates are equipped with reinforcement according to flexural members (excluding the influence of axial force), and the side walls are calculated as eccentric compression members; The longitudinal reinforcement of culvert body shall be set at a reinforcement ratio of not less than 3 ‰, and the overall calculation may not be required.

（2） Culvert body load: the load on the culvert body includes the dead weight of the culvert body, the pressure of filling and paving on the side and top surfaces of the culvert body, excluding the pavement on the bottom plate of the culvert. Considering the live load on the culvert body, the exposed culvert diffuses the wheel load at an angle of 45o and includes the impact force; The concealed culvert diffuses the wheel load at an angle of 30o, excluding the impact force; The influence of crowd and vehicle loads on the inner floor is not included. The unit weight of soil is 19KN/m3, and the internal friction angle is 35o.

（3） The temperature stress shall be considered as ± 10 ℃, and the shrinkage effect of the concrete when the bottom plate, side wall and top plate are poured by stages shall be considered. This item shall be treated as 15 ℃ cooling.

（4） For the calculation of inclined culvert body, the orthogonal channel calculation is still tried.

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