— Crossings

Water and services,
under the line above.

Name: Box Culvert
Brand: Trilok Infratech

RCC precast box culverts for storm water drains, power ducts and road crossings — a replacement of pipe culverts, single or twin cell, dropped straight into the trench.

RCC M50–M75 Single / twin cell IRC loading Plug & socket

Specifications

Section: 1000 × 1000
Config: Single / twin
Concrete: M50–M75
Loading: IRC class

The product

A box culvert carries water and services across the line of a road or railway without breaking the surface above. Cast complete in RCC, each box is set into the trench, jointed and backfilled — the route over the top carries on as if it were never opened.

Single cell or twin, the box is sized to the hydraulic load it has to pass and the traffic load it has to carry. It is the crossing we put under highways, embankments and rail lines where the structure has to take everything overhead.

Why precast

Building a culvert in place means a long open cut across a live route and weeks of formwork and curing. A precast box arrives finished — it sets in a day, takes load immediately, and the route reopens far sooner.

Where it's used

It carries storm water drains, power ducts and road crossings in place of pipe culverts — anywhere a span has to pass water or services beneath a load-bearing surface.

Cast complete, set in a day. The road over the top barely knows the crossing went in.

— Applications

Where it goes to work

Storm water drains Power ducts Road crossings Pipe culvert replacement

— Why it holds up

A crossing that takes the load above it.

Carries road & rail

Sized and reinforced to take highway and railway loads passing overhead.

Single or twin cell

One box or two, matched to the hydraulic load the crossing has to pass.

Straight into the trench

Cast complete, set in sequence and backfilled the same day.

— Specifications

Engineering specifications

Standard box sections.

Dimensions of box culvert (mm)

Size B × H (mm)	B	B1	H	H1	L	Ts	Tw	C	d1	d2
300 × 300	300	480	300	520	2000	110	90	50	—	—
500 × 500	500	680	500	740	2000	120	90	75	—	—
600 × 600	600	780	600	840	2000	120	90	50	—	—
800 × 800	800	1060	800	1060	2000	130	130	100	60	60
900 × 900	900	1120	900	1160	2000	130	110	150	60	55
600 × 1000	600	860	1000	1260	2000	130	130	150	60	60
900 × 1000	900	1160	1000	1260	2000	130	130	150	60	60
1000 × 1000	1000	1260	1000	1260	2000	130	130	150	60	55
1200 × 1000	1200	1460	1000	1260	2000	130	130	150	60	60
1200 × 1200	1200	1460	1200	1500	2000	150	130	50	60	55
1000 × 600	1000	1260	600	860	2000	130	130	150	60	55
800 × 1400	800	1060	1400	1660	2000	130	130	150	60	60
900 × 1400	900	1160	1400	1660	2000	130	130	150	60	60
1000 × 1400	1000	1260	1400	1660	2000	130	130	150	60	60
1200 × 1400	1200	1460	1400	1660	2000	130	130	150	60	60
1300 × 1400	1300	1560	1400	1700	2000	150	130	150	60	60
1500 × 1400	1500	1760	1400	1700	2000	150	130	150	60	55
1500 × 1500	1500	1760	1500	1800	2000	150	130	150	60	55
1400 × 1000	1400	1660	1000	1260	2000	130	130	150	60	60
1400 × 1200	1400	1660	1200	1460	2000	130	130	150	60	60
2000 × 1200	2000	2320	1200	1560	2000	180	160	200	80	80
2000 × 1500	2000	2320	1500	1860	2000	180	160	200	60	55
2000 × 1800	2000	2320	1800	2160	2000	180	160	200	80	80
2000 × 2000	2000	2320	2000	2360	2000	180	160	200	60	55
2500 × 1500	2500	2900	1500	1940	1500	220	200	200	80	80
2500 × 1800	2500	2900	1800	2240	1500	220	200	200	80	80
2500 × 2000	2500	2900	2000	2440	1500	220	200	200	80	80
2500 × 2500	2500	2900	2500	2940	1500	220	200	200	60	55
3000 × 3000	3000	3440	3000	3480	1000	240	220	300	60	55

Customized sizes available for mass quantity.

Box Culvert — Front, side & foundation Front view B1, B, Tw, Ts, H1, H, C · socket side and plug side · side view L, d1, d2 · typical foundation — Front, side & foundation · Front view B1, B, Tw, Ts, H1, H, C · socket side and plug side · side view L, d1, d2 · typical foundation

Typical foundation details.

20 mm bedding mortar on foundation concrete over crushed stone, thickening with the span. The foundation runs 100 mm beyond the box on each side (B2 = 100 + B1 + 100).

Foundation thickness (mm)

Span B (mm)	t1	t2
600 – 1000	100	150
1100 – 2000	150	200
2200 – 3000	200	250

Typical joint details.

Plug and socket — grooves for a rubber gasket and for mortar filling.

Joint type: Plug & socket
Flange bolt connection: Available for selected sizes
Sealing material: Rubber gasket
Mortar filling: Grooved joint

Send us a drawing and we'll cast to your exact span, cell count, loading and length.

Box Culvert — Joint detail Plug & socket — groove for rubber gasket and mortar filling — Joint detail · Plug & socket — groove for rubber gasket and mortar filling

— 3D view

Turn it around

Drag to rotate the Box Culvert and zoom in to see the section, joints and lifting points.

Drag to rotate

— FAQ

About the box culvert.

Common questions on loading, configuration and jointing. For anything project-specific, send us your drawing.

01What loading is the box culvert designed for?

Each box is reinforced to the load it carries — IRC class highway loading or railway loading — so it takes traffic passing overhead. We design the reinforcement to your specific cover depth and load case.

02Single cell or twin cell — how do I choose?

It comes down to the hydraulic load the crossing has to pass and the headroom available. A twin cell carries more flow within a shallower depth. Send us the flow and cover and we'll size it.

03What sizes do you cast?

29 standard sections from 300 × 300 mm up to 3000 × 3000 mm. Sections up to 2000 mm wide are cast in 2000 mm lengths, 2500 mm-wide sections in 1500 mm lengths and the 3000 × 3000 in 1000 mm lengths. Customized sizes are available for mass quantity.

04How are boxes jointed and sealed?

A plug-and-socket joint with grooves for a rubber gasket and mortar filling. A flange bolt connection is also available for selected sizes.

05What foundation does it need?

A 20 mm bedding mortar on foundation concrete over crushed stone, sized to the span — 100–250 mm thick as the span grows, and 100 mm wider than the box on each side. Cast complete, the box sets in a day and is backfilled the same day.

06What standards is it cast to?

RCC in high-performance concrete from M50 to M75, designed and cast to IS 14930 and IRC loading. Every batch is strength-tested with test certificates and traceability. Send us your span and load for an exact spec.

— The range

Other precast lines

01 Drainage T25 U-Shape Drain (Heavy)

U-Drain Heavy (T25)

Heavy-duty precast U-drain with a load carrying capacity of 5 T wheel load — for storm water drains and power and telecommunication cable ducts where traffic runs over the channel.

M50–M75 concrete 5 T wheel load Smooth-bore RCC

Heavy-duty drainage · 5 T wheel load

02 Drainage T6 U-Shape Drain (Light)

U-Drain Light (T6)

Light precast U-drain (T6) for storm water drains and power and telecommunication cable ducts on footpaths, plazas and low-traffic streets — the same sealed, smooth bore in a leaner section.

M50–M75 concrete T6 section Smooth-bore Flush finish

Light-duty drainage

03 Drainage & crossings FT-Flume Precast U-Drain

FT-Flume

Precast FT-Flume for storm water drains, power ducts and road crossings — a replacement of pipe culverts, cast in 2 m lengths across a wide range of heights and widths.

M50–M75 concrete Open storm water drain Smooth-bore 2 m lengths

Storm water, ducts & road crossings

04 Retaining Earth Retaining Wall

Earth Retaining Wall

Modular precast retaining systems that prevent soil erosion, retain the soil near culverts, underpasses and bridges, and stabilise sloped ground. Interlocking units stack quickly and carry load from day one.

L-type Modular M50–M75 concrete Fair-face

Embankments & slopes

All products

Start a conversation

Need box culverts?

Send us your specifications and quantities. We'll come back with grades, lead times and a quote — usually within two working days.

See where it's used

+91 95104 39933 info@trilokinfratech.com