The 1967 IRC 26 code outlines the design specifications, materials, dimensions, and installation procedures for 200-metre stones used as distance indicators along Indian roads. It aims to provide consistent guidelines for engineers and road authorities to ensure these markers are durable and uniformly placed across diverse road environments.
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Roads and Bridges IRC- Indian road congress Category
The 1967 IRC 26 code outlines the design specifications, materials, dimensions, and installation procedures for 200-metre stones used as distance indicators along Indian roads. It aims to provide consistent guidelines for engineers and road authorities to ensure these markers are durable and uniformly placed across diverse road environments.
Audience
Who Uses This Standard
Highway design engineers
Road construction contractors
Public works department personnel
Transport planners
Surveying professionals
Civil engineering consultants
Quality assurance inspectors
Contents
Key Topics Covered
✓Specifications for materials used in 200-metre stones
✓Design types and size requirements for numerals
✓Details on reinforcement for reinforced cement concrete stones
✓Installation procedures on embankments and cut sections
✓Standards for color and inscriptions
✓Placement guidelines relative to kilometre stones
✓Utilization of locally sourced hard stone
✓Conversion methods for existing furlong stones
✓Techniques for securing stones with rammed spalls and concrete
✓Standardized numeral height and font style
✓Cross-sectional design particulars
✓Considerations for maintenance and long-term durability
Structure
Table of Contents
1Overview and Committee Acknowledgement
2Applicability and Scope of the Standard
3Material Specifications and Requirements
4Design Specifications and Dimensional Details
5Numeral Design and Size Specifications
6Positioning and Fixing of 200-Metre Stones
7Installation Procedures on Embankments
8Installation Guidelines in Cuttings
9Reinforcement Details for RCC Stones
10Color Coding and Inscription Standards
11Conversion of Furlong Stones to Metric Units
12Cross-Sectional and Reinforcement Layout
13Maintenance Practices and Durability Measures
Frequently Asked
Popular Questions About IRC 26
?What materials are approved for manufacturing 200-metre stones according to IRC 26?▼
IRC 26 permits the use of either locally sourced hard stones that are well dressed or reinforced cement concrete (RCC) for constructing 200-metre stones. These materials ensure the markers are durable and suitable for their purpose. The stones must be firmly installed just beyond the road formation edge, with the inscribed face oriented parallel to the road’s centerline.
?What are the prescribed dimensions and numeral sizes for 200-metre stones?▼
The standard dimensions and sizes of numerals for 200-metre stones are defined in the type design shown in Figure 1 of IRC 26, with all measurements provided in millimetres. The numerals are specified to be 80 mm in height. While the exact figures are detailed within the full code, the design ensures consistent size and visibility for roadside distance markers.
?How should 200-metre stones be installed on embankments compared to cuttings?▼
According to IRC 26, 200-metre stones must be placed on the same side as kilometre stones and securely fixed just beyond the formation edge. Installation involves embedding the stones with rammed spalls in moorum, lime-surkhi concrete, or lean cement concrete. The inscribed side must face and be parallel to the road centerline. Specific positioning varies between embankments and cuttings as illustrated in Figure 2 of the code to ensure stability and visibility.
?What reinforcement specifications are required when using reinforced cement concrete for 200-metre stones?▼
While IRC 26 does not provide explicit reinforcement schedules for RCC stones within the retrieved context, standard practice includes specifying the size, spacing, and placement of steel reinforcement bars to resist tensile forces and ensure durability. It is recommended to follow relevant Indian Standards such as IS 456 for comprehensive guidelines on reinforcement detailing.
?Is it possible to convert existing furlong stones into 200-metre stones as per IRC 26?▼
Yes, IRC 26 permits the economical conversion of existing furlong stones into 200-metre stones. The standard provides a type design with all dimensions in millimetres to facilitate this transition, ensuring uniformity and metric compliance for distance markers on Indian roads.
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