Technology-first civil contractors · Patna, Bihar
Built twice. First in the model, then on site.
Warehouse complexes, roads and bridges. Before anyone digs, we draw the whole job to scale, put the loads on it and rehearse the build stage by stage. Problems show up on a screen, not in concrete, and material goes where the loads call for it, not where guesswork would put it.
01Plan
First, the whole complex on one drawing.
Godowns, platforms, roads, walls, drains and the gate are drawn together and to scale, so every part meets the next where it should. Point at a number on the plan to see what it is.
What the plan settles
Where one piece of work meets the next: road against platform, drain against boundary wall, gate against road. A mismatch caught here is fixed on the drawing, before anything is poured.
What we do on site
Everything is set out from this one plan and built as one job, so nothing has to be fitted in afterwards.
02Test
Then we turn the wind on.
One godown from that plan, cut across its width. We load its roof truss with wind from either side and see which members pull and which push. You are the wind: move across the godown, and the truss is solved again as you go.
What the test shows
Assumed for this typical roof: a weight of 0.20 kN/m², net suction coefficients of 1.03 on the windward slope and 0.90 on the leeward, and a design wind of 47 m/s. Wind suction then cancels the weight of the roof at about 19 m/s. At the design wind a column is pulled upward with 67 kN, and the bottom chord flips from tension to compression.
What we do on site
Holding-down bolts, 20 mm in diameter and 910 mm long, are set on the columns before the concrete goes in round them: once it is cast they cannot be added. Wind ties brace the bottom chord against that push.
03Rehearse
Then we rehearse the build, in site order.
Typical 5,000 MT godown, three bays at the gable end. Truss shape and roof pitch are assumed, and so are these sizes in mm: columns 400 × 400, column footings 1,200 square, lintel band and tie beam 150 deep.
- Setting out Column lines at 4,650 centres and a 21,800 span are marked on the ground. The first inspection signs off the layout before any digging.
- Foundations Column pits go down 1,300 onto a lean concrete bed. The soil is treated against termites before anything is built on it.
- Plinth The floor is raised 800 above the ground: level with a truck bed, and clear of flood water. The fill goes in thin layers, rammed, then flooded for a day.
- Walls to lintel Concrete columns and thick brick walls rise together to door height, where a concrete band ties the wall.
- Walls to tie beam Every panel gets a top ventilator. The holding-down bolts from the wind test are set on the columns, then the column heads and the tie beam are cast round them: after that pour it is too late.
- Roof steel Tubular trusses are lifted onto the columns, then purlins and wind ties. The end wall carries the purlins itself, so it needs no truss: steel only where it works.
- Sheeting, doors, floor The roof goes on first so the floor can be laid dry beneath it. Steel doors hang on the outer face of the wall.
- Completion Plinth protection and the concrete road finish the job. The last inspection asks one question: is it fit for occupation?
What the rehearsal settles
The order: bolts before the pour, the roof before the floor. And the 4 points where an inspection holds the work until it passes: the layout, the walls at lintel level, the roof steel and completion.
What we do on site
The same 8 stages in the same order, with the same 4 stops. And no more steel than the model asks for: the gable wall carries the purlins itself, so it gets no truss.
04Detail
Last, the details that water and wheels test every day.
The plinth edge, the road and the boundary wall are drawn layer by layer, as carefully as the roof.
What the sections settle
The road gets its layers, 200 mm of concrete on 100 mm of stone base, and roof water gets a route all the way out: eaves, pipe, plinth protection, drain.
What we do on site
On a real job the sizes and the falls come from that project’s own drawings. What carries over from here is the order of the layers and the route the water takes.
Same method · Roads and bridges
Go ahead. Load it.Built for the load that crosses it.
Roads and bridges get the same treatment. On a bridge the load moves, so testing one position proves little. Your pointer is a standard highway loading train. This page solves the bridge again for every position: reactions, shear, bending moment, deflection.
What the test shows
On this typical bridge of three spans, 30 + 40 + 30 m, the hardest bending over the first pier does not come with the heaviest axles standing on it. It comes with them about 20 m further on, near the middle of the 40 m span.
What we take from it
We check every position of the load and keep the worst at each point. That worst case, together with the bridge’s own weight, its other loads and the safety factors of the design code, is what the girder is designed for: a calculated demand, not a guess.
The second build
Then we build it on site. Once.
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