![]() It addition, at the curved alignment the culvert is resisted by an additional force due to centrifugal action. It should not be curved, because it requires a great care and maintenance. Alignment should be such that a smooth entry and exit of the stream flow can be obtained. As far as possible the skew alignment should be avoided. the axis of culvert should cross the stream exactly at 90°. ![]() The exact alignment should be done by considering the following points: Approaches on both sides of the culvert should be in straight form, at feast for the distance of 15 m.Īfter selecting the construction site of culvert, the next step is to decide the alignment of culvert. As far as possible the straight crossing of stream section should be considered. At the construction site, the stream flow should not be in turbulent nature, because it causes soil scouring near the foundation, which can cause damage the culvert. ![]() This reduces the length of culvert and its cost of construction, also The crossing width should be minimum at the site. There should be firmed bank on either side of the stream for culvert’s foundation. There should be a good soil strata for the construction of aboutment and piers’ foundation. It should be in a straight reach of the stream. It is an important consideration in the view of economy and safety of the culvert/bridge.įor this purpose the following points should be considered for ideal location of culvert: The sinking of any portion causes an effective change in the bending moment as well as shearing force in the section. The design of this type of culvert is based on the continuous beam theory. The box culverts usually made of precast R.C.C. These culverts are constructed in the form of one or more rectangular or square openings. The thickness of R.C.C slab should be kept within the range of 1.25 to 2.5 m. Practically, it has been found that the box culverts are not economical, when span width exceeds 6 in. These can be used for a single span of 3 m or for a double span of 6 m width. ![]() These culverts are preferred for construction, especially in loose soil condition, and for a larger span. The cushion should not be less than half of the diameter of the pipe with a maximum 45 cm at the top. In this condition, there should be given a proper cushion, all-round. In the case, when height of embankment is more than 6 m over the pipe then an extra care is needed. Sometimes, it is also performed by stone pitching. ![]()
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