STANDARD DRAWINGS FOR ROAD BRIDGES - R.C.C. SOLID SLAB SUPERSTRUCTURE (15°&30°SKEW) SPAN 4.0m TO 10.0m (WITH AND WITHOUT FOOTPATHS)

Oct 23, 2026

Standard drawings for road bridges by the Indian Roads Congress present R.C.C. solid slab superstructure arrangements for skew angles of 15° and 30°, covering spans from 4.0m to 10.0m, with and without footpaths. The document provides general application notes, dimensional requirements in millimetres, workmanship rules for concrete surfaces and compaction, and guidance for footpath provisions and related urban detailing. It also specifies design criteria, materials and concrete mix requirements, reinforcement laps and bending, load cases for moderate and severe exposure, and related general specifications for deck components.

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STANDARD DRAWINGS FOR ROAD BRIDGES

R.C.C. SOLID SLAB SUPERSTRUCTURE (15°&30°SKEW) SPAN 4.0m TO 10.0m (WITH AND WITHOUT FOOTPATHS)

General Notes (DRG.NO.SD/151)

Materials Specifications

Loads and Design Criteria

Reinforcement and Water Specifications

General Specifications

Ministry of Surface Transport(Roads Wing) # STANDARD DRAWINGS FOR ROAD BRIDGES R.C.c.SOLID SLAB SUPERSTRUCTURE(15°&30°SKEW)SPAN 4.0m TO 10.0m (WITH AND WITHOUT FOOTPATHS) 5.1 Fc中a wuàMinistry of Surface Transport(Roads Wing) STANDARD DRAWINGS FOR ROAD BRIDGES R.C.C.SOLID SLAB SUPERSTRUCTURE(15°&30°SKEW)SPAN 4.0m TO 10.0m(WITH AND WITHOUT FOOTPATHS) Published byThe Indian Roads Congresson behalf of the Govt.of IndiaMinistry of Surface Transport(Roads Wing) Copies can be had fromthe Secretary,Indian Roads Congress,Jamnagar House,Shahjahan Road,New Delhi-110011 Published :1992 :August,2003 Reprinted :July,2006 Reprinted Reprinted :June,2009 Reprinted :May,2015 ◎Copyrigh,1992 (This volume or parts thereof may not be reproduced in any form without permision o the Publishers) | DRG.NO.SD/151 | | | | | | | --- | --- | --- | --- | --- | --- | | A)CENERAL
1.These notes are applicoble for the Stondard Drowings for
9.Width of expansion joint has been kept 20mm only which
a)For hardened concrete,the surface shall be thoro-
R.C.C aolid slab superstructure with and without footpaths.
ughly cleoned to remove debis/laitance and made
does not coter for any qallowance for possible tilting of
2.These drowings are opplicoble only for skew bridges with
rough so that 1/4 of the size of the aggregote
abutment.
is exposed but without dislodging the oggregate or
overall right width of 12 m.
10.Support for the deck slab shall provide o bearing width ot
structuraily damoqing the concrete.
400mm measured in a direction perpendicular to support.
3.No raised footpaths shall be provided on bridges heving
b)For portilly hardened concrete.the surfoce shall be
11.In urban oreos,chequered tiles may be provided in the
length less than 30m mecsured along skew direction unless
treated by wire brush followed by an air jet.
the same are otherwise existing on the approaches.
footpath portion by suitably adjusting the thickness of the
c)The old surfoce shall be sooked with water without
footpath slob.
4.Ail dimensions are in millimetres uniess otherwise mentioned.
leaving puddles immediately before starting concre-
Only written dimensions are to be followed.No drowing shall
12.Type/position of return walls,railings.guard posts,ramp
ting to prevent the obsorption of water from new
be scaied.
ete.in approach portion shall be decided by the
concrete.
Engineer-in-charge.
5.Design criterio:
IV.New concrete shall be thoroughly compacted in the
1 The design s according to the following codes:
region of the joint.
(B)MATERIALS SPECIFICATIONS
(a)IRC:5-1985
4.Welding of reinforcement bors shall not be permitted.
Concrete
(b)IRC:6-1966(1985 reprint)
5.Lops in reinforcement:
(c)IRC:21-1987.
,1.Minimum lap length of reinforcement shall be kept
1. Conerete shail be design mix and shall have minimum
as 83 d where 'd"is the diameter of bar.
28 days characteristic strength of 30 MPa on 150mm
l.The following loods have been considered in the design:
1.Not more than 50%of reinforcement shall be lapped
cubes for all elements of superstructure for both "SEVERE'
(a)One lane of IRC class 70R or two lanes of IRC
at any one locaton.
and 'MODERATE'conditions of exposure.
ciass A on carriage woy,whichever governs.
Ⅲ.For closely soaced bars lopping may be avoided by
(b)Footpath load ot 5 kN/sq.m.for superstructure
providing suitable type of mechaniccl splices.
2.Ordinary portand cement conforming to IS:269 or high
heving footpaths.
strength ordnary portland cement comforning to IS:8112
6.Bending of re:nforcement bars shll be as per iS:2502.
(c)Wearing coat load of 2 kN/sq.m.
capable of achieving the required des gn concrete strength
7.S

FAQs

For which bridges are the standard drawings applicable?

They apply to skew bridges with the stated overall right width of 12 m. The notes also restrict cases such as raised footpaths and define conditions for footpath-related provisions.

What span and skew range does the R.C.C. solid slab superstructure cover?

The superstructure covers spans from 4.0m to 10.0m and skew angles of 15° and 30°.

What core design loads and exposure conditions are considered?

The document considers IRC class 70R lanes (or two lanes) and specified footpath and wearing-coat loads, and it distinguishes designs for moderate and severe exposure conditions.

Oct 23, 2026

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