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Stability of Acces Gallies

The document requests an expert opinion on the structural stability and adequacy of reinforcement in access gallery roof slabs given construction drawings. It notes that the drawings show 15 meters of gallery extension and sloped RCC fill up to 17 meters thick. However, the reinforcement details of 16mm bars at 30cm centers appears insufficient to withstand the heavy RCC load. Reanalysis of the section is requested to ensure structural stability under the RCC fill, as construction is currently in progress.

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26 views2 pages

Stability of Acces Gallies

The document requests an expert opinion on the structural stability and adequacy of reinforcement in access gallery roof slabs given construction drawings. It notes that the drawings show 15 meters of gallery extension and sloped RCC fill up to 17 meters thick. However, the reinforcement details of 16mm bars at 30cm centers appears insufficient to withstand the heavy RCC load. Reanalysis of the section is requested to ensure structural stability under the RCC fill, as construction is currently in progress.

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Anonymous KHIyWRIWma
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Subject: Structural Stability of Access Galleries (Adequacy of roof slab Reinforcement)

We would like to share one observation with respect to structural stability of the access galleries (right
and left) and seeking your expert opinion /advice regarding the adequacy of steel reinforcement given
in the tender (construction) drawings.

Please refer Drawing No.201.21-A wherein cross section 1C-1C Raised Gravity Pat is provided. As given
in the drawings that existing access galley shall be extended in 15.0 m length. Similarly, RCC will be
extended in 15.0 width. As shown in the drawings that access Gallery structure will accommodate RCC
fill on its top. RCC fill will be placed in slope, hence, at outer part of the gallery the fill be zero and at
inner part RCC fill will be around 17.0 m.

Please refer drawings No.202.01.04 wherein steel reinforcements details are provided for access
galley. As indicated in Section 2-2 that the reinforcements detail of that section reveals that 16 mm
bars are provided at 30 cm C/C; which looks insufficient to withstand the huge RCC load over it.

We would request to reanalyse above section with respect to structural stability (adequacy of steel
reinforcement) to accommodate the RCC fill/load above it.

Please advise urgent because currently construction activities are in progress in stated area.

SECTION – 1C-1C (Raised Gravity Part – Drawing No.201.21-A)


SECTION -2-2 (Drawing No.202.1.04)

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