1. When the joint of the concrete pipe culvert and the joints with the hinge joints drop, the leakage of the roadbed and the seepage of the roadbed should be stopped in time. When processing, it can be filled with dry drumsticks and filled with other viscoelastic materials. It is not advisable to use mortar to smear joints to avoid falling again.

2. If the pipe joints are seriously cracked due to the settlement of the foundation, they should be excavated and rebuilt after the foundation is filled. The lining grouting method can also be applied directly to the foundation. If a hinge culvert pipe is larger than 1 / 20 of the diameter, it should be checked.

3. When the embankment around the pressure culvert inlet is found to be seepage, void, notch or scour, it should be repaired in time. Roadbed around the roadbed can be blocked by impervious clay, paving or retaining walls before the tunnel.

4. pressure culvert or inverted siphon culvert surface wet spots, should be handled in a timely manner. The top surface of culvert can be treated by grouting, shotcreting or lining.

5. the culvert pipe subsidence deformation of corrugated pipe culvert, it is necessary to remove the repair. The bottom of the pipe should be well bedding according to the soil quality, and a waterproof layer should be laid on the pipe.

6. If the side walls and wing walls of the culverts deviate from the deformation of the roadbed and the skew, they should be checked and handled. If the fill is not compacted and sinks and squeezed, or the deformation caused by excessive soil pressure increases in the fill, the well filled soil with good water permeability should be replaced and seriously consolidated. If the slope is caused by foundation, it needs to be repaired or reinforced.

7. when widening or heightening the subgrade, when the length of the original culvert is short, it should be treated. In general, the original culvert hole can be long, two end walls and subgrade revetment are built. When the road base is widened and widened, the end wall of the two holes can also be used to increase and increase the wing wall of the tunnel.

8. when the culvert azimuth is not appropriate, the drainage has a bad effect on the surrounding environment, or the lack of drainage capacity causes the waterlogging, or the culvert carrying capacity is lack, and when the driving is not safe, it should be reformed. Reconstruction works can be carried out piecewise in order to maintain traffic. Attention should be paid to waterproofing treatment at the joints.