1, joints of concrete pipes and culverts and joints with hinge points shall be blocked in time when the filler falls off and causes subgrade seepage. During the treatment, it can be filled with hemp wool after drilling through asphalt, or it can be blocked with other viscoelastic data. It is not advisable to wipe the seams with mortar to avoid falling off again.
2. If the pipe culvert pipe joint is seriously dislocated due to foundation subsidence, the foundation should be dug and filled before reconstruction. The foundation can also be directly treated by lining grouting. If the deformation of articulated culvert pipe is greater than 1/20 of the diameter, the reason should be found out and treated.
3. If any leakage, void, gap or scour is found in the embankment around the entrance of the pressure culvert, it shall be repaired in time. The roadbed around the hole can be blocked with impervious clay, and a water retaining wall can be laid or built before the hole.
4, pressure culvert or inverted siphon culvert top pavement wet spots, should be handled in time. It can be treated by plastering, shotcreting or lining the top surface of culvert.
5, corrugated pipe culvert subsidence deformation, must be removed to repair. The bottom of the pipe should be padded according to the soil conditions, and a waterproof layer should be laid on the pipe, and the backfill soil should be compacted in layers.
6. If the side wall and wing wall of culvert deviate from the subgrade, the reasons should be found out and treated. If the fill is not compacted, sinks and rubs, or if there is too much water in the fill and the earth pressure increases and deforms, the fill with good water permeability should be replaced and compacted carefully. If the skew is caused by the foundation, it needs to be repaired or reinforced.
7. When widening or heightening subgrade, if the length of the original culvert is short, it should be lengthened. Usually, the original culvert body can be extended, and the entrance end wall and subgrade slope protection can be built at both ends; When the height and width of subgrade are not much, the methods of heightening the end walls of two openings and heightening and lengthening the wing walls of openings can also be adopted.
8. When the culvert is not located properly, drainage will have a negative impact on the surrounding environment; Or insufficient drainage capacity, leading to waterlogging; Or the culvert has insufficient bearing capacity and unsafe driving, so it should be rebuilt. Reconstruction can be carried out in stages to maintain traffic. At this time, we should pay attention to the waterproof treatment of broken joints.
Repair and reinforcement of culvert inlet;
(1) Culverts located on steep slopes or directly affected by water flow should take appropriate protective measures at their entrances, such as mortar retaining walls, falling water, grit chambers, etc.
(2) Masonry the foundation with slurry block stone, and tick off seam with cement mortar. The paving length depends on the soil quality and flow rate. At the end of paving, a concrete or mortar block stone retaining wall should be set.
(3) For culverts with particularly large flow velocity, stilling devices such as stilling sill and stilling basin should be added at the exit. At the end of stilling sill, a concrete or mortar stone retaining wall should be set, or a three-level sill should be set.
Weathering, cracking, mortar joint falling off, loose falling off of some stones or leakage of masonry culvert can be treated in the following ways according to the situation:
(1) jointing with cement mortar at the beginning, or partially demolished and rebuilt.
(2) Exterior wall plastering or shotcreting treatment.
(3) After masonry, cement or chemical mortar is injected.
(4) Culvert lining and pressurized cement slurry.
(5) Dig fill, repair masonry and add waterproof layer.
Culverts lacking bearing capacity should be reinforced or replaced. According to the traffic conditions, subgrade fill height and culvert drainage, the following methods are adopted to strengthen the house:
(1) Excavate fill soil, and thicken the outer section of the original culvert with concrete or reinforced concrete.
(2) Excavate and fill the soil, and change it in sections.
(3) Culverts are reinforced with concrete or reinforced concrete prefabricated parts or cast-in-place lining.
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