![]() Hence to construct under bridges through embankment without disturbing the existing railway / road traffic, we choose to construct REINFORCED CEMENT CONCRETE BOX UNDER BRIDGE by Box pushing Technique, where R.C.C. ![]() ![]() Intensity of traffic, both on rail & road in the present day is very heavy due to the population explosion and fast development of Industries they cannot be disturbed for construction of under bridges, drainage works, etc by conventional Cut and Cover method and RH girder method of construction system. The under bridges are also required in urban areas where the busy business location streets crosses the railway lines. Box pushing Technic is safest method of constructing RUB for crossing underground / Embankment, without disturbing overhead traffic /structures.Under bridges are required to be provided under earthen embankments for crossing of vehicular traffic, drainage, railway traffic across the level crossing of railway line. The required bearing capacity of soil is very little. After completion of the work, thrust bed can be used as a protection work in Hydraulic structures and rigid pavement work in Highway structures. To push the box into the embankment of railway, the required thrust can be generated from thrust bed by jacking. The box segment analysis part is done manually or STAAD using Moment Distribution Method and as per IRS bridge rules. The line & level of precast boxes is also controlled. The required thrust is generated through thrust bed constructed at the site. boxes in segments are casted outside and pushed through the heavy embankments of rail or road by jacking. Under bridges are required to be provided under earthen embankments for crossing of vehicular traffic, drainage, railway traffic across the level crossing of railway line. The results of the study reveal that the dynamic study has significant influence on the result of the analysis and should be carefully considered. IRC 70R loading is used for the analysis and design of culverts. The box culverts are modelled using SAP 2000 software using effective width method. An attempt is made to carry out a parametric study on the behavior of a multi cell box culvert subjected to dead loads as well as IRC wheel loadings. In the present study span to height ratio of the culvert is analyzed by taking 3D analysis and dynamic vehicular analysis result is compared to a simplified static analysis. Hence, there is need to for a detailed parametric study on multi-cell box culvert structures in order to understand their structural behavior and to study the influence of various parameters effecting its structural behavior. Structurally, box culverts are complicated structures as they are buried completely in soil and because of their self-stabilizing nature. Box culverts do not require a separate extensive foundation system and they are ideally suited for medium spans. The results obtained using MDM method shows a good agreement with the results obtained from computational methods.īox culverts are very important part of a transportation network as they provide an economical alternative to heavy bridges. Further, it was also observed that the analysis using manual calculation becomes very tedious and cumbersome and for a complex type of structure, thus it is quite a complex task to perform the analysis manually, so the use of computational method (Staad – pro and excel sheet) becomes the obvious choice for design. The structural elements (top slab, bottom slab, side wall) were designed to withstand Ultimate Load criteria (maximum bending moment and shear force) due to various loads (Dead Load, Live Load, SIDL, LL surcharge, DL surcharge) and serviceability criteria (Crack width) and a comparative study of the results obtained from the above two approach has been carried out to validate the correctness of the results. MDM method) and by computational approach (Staad-pro) using IRS - CBC codes. This study demonstrates the structural analysis and design of RCC box type minor bridge using manual approach (i.e.
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