Construction Detail Drawing with Circular Chamber Section 1200 mm

This construction detail drawing presents a clear AutoCAD-based layout of a circular underground chamber used for civil infrastructure works. The drawing includes plan views and sectional details marked as B 1 and B 2, showing the internal chamber profile, inlet and outlet pipe connections, and flow direction arrows. The circular chamber is detailed with an approximate internal diameter of 1200 mm and uniform wall thickness, clearly indicated with dimension lines. Foundation base thickness, side wall construction layers, and top slab details are shown to guide accurate site execution. Reinforced concrete elements are represented with hatch patterns to explain material composition and structural behavior under load conditions.