Type Designs for Boundary Stones
1967 Edition

The Introduction and Specification sections of IRC 25 establish the foundational instructions for road and bridge boundary stone construction. Central to this is the Bar Bending Schedule, specifying reinforcement details including bar type, diameter, length, and shape. For instance, main bars are 6 mm in diameter with a length of 1840 mm, while stirrups vary between 370 mm to 810 mm depending on position. Clause 3.1 covers location and spacing to maintain structural soundness through proper reinforcement placement and concrete coverage.

Reference: Clause 1, Clause 3, Bar Bending Schedule

IRC 25 defines the scope covering specifications for boundary stones, including their design types, dimensions, and reinforcement details according to approved blueprints. The bar bending schedules specify bar numbers, shapes, diameters, lengths, and inclusion of hooks. For example, main bars are 6 mm diameter and 1840 mm long, with stirrups ranging from 370 mm to 810 mm. These designs were ratified by the Specifications and Standards Committee and Executive Committee in 1967. Location and spacing instructions are included, though detailed spacing data is not fully provided here.

Reference: Clause 3, Clause 3.1, Bar Bending Schedule

IRC 25’s detailed specifications for reinforced concrete boundary stones include bar bending schedules that define bar types, diameters, lengths, and shapes with hooks. For example, main reinforcement bars are 6 mm in diameter and 1840 mm in length, with stirrups varying between 370 mm and 810 mm. These designs were officially endorsed by the relevant committees in 1967 to standardize construction practices. The bar bending schedule is essential for accurate reinforcement detailing.

Reference: Specification Clause 3, Bar Bending Schedule

According to IRC 25, boundary stones are to be positioned on both sides of the road land opposite every 200-Metre and Kilometre Stone, as well as at all boundary angular points. For curved boundaries or high-value lands susceptible to encroachment, stones must be placed closer. The Bar Bending Schedule indicates typical spacing for reinforcement bars; for example, topmost stirrups have 370 mm spacing, the second stirrup 440 mm, and the lowest 810 mm, all using 6 mm diameter bars. These spacing norms ensure reinforcement integrity and proper load distribution.

Reference: Clause 3.1, Bar Bending Schedule

The provided context does not specify precise formulas, tables, or detailed standards for inscriptions on boundary stones. Typically, inscriptions include boundary identification codes, survey numbers, and location data. Exact dimensions, lettering size, or layout are not detailed here. For comprehensive inscription guidelines, refer to the full IRC 25 document or related land surveying standards.

Reference: Not explicitly provided

Clause 3.3 of IRC 25 discusses the methodology for securing reinforcement bars during construction to ensure they remain in the specified positions and spacings. Though specific formulas or detailed descriptions are absent here, standard practice involves using binding wires at bar intersections and supports like chairs or spacers to maintain stability. The bar sizes and lengths—main bars of 6 mm diameter and 1840 mm length, and stirrups ranging from 370 mm to 810 mm—affect fixing methods. Proper fixing is critical for structural performance and compliance with spacing requirements.

Reference: Clause 3.3, Clause 3.1, Bar Bending Schedule

IRC 25 provides approved standard designs for boundary stones as sanctioned by the Specifications and Standards Committee and Executive Committee in 1967. However, the retrieved excerpts do not include detailed formulas, tables, or exact specifications. The designs are depicted in the Plates accompanying the code. For full details on dimensions, reinforcement, and materials, consult the original IRC 25 publication.

Reference: Type Designs Clause

IRC 25 primarily addresses materials for reinforced cement concrete (R.C.C.) boundary stones. Key materials include:

• Cement Concrete: Specifications on mix and quality are implied.
• Reinforcement Bars: Detailed in the bar bending schedules, specifying bar numbers, diameters (mostly 6 mm), lengths, and shapes including hooks.

A representative Bar Bending Schedule includes:

Though no explicit formulas are cited, the emphasis is on material types and reinforcement detailing.

Reference: Bar Bending Schedule

IRC 25 details reinforcement through a Bar Bending Schedule outlining bar types, diameters, lengths, and shapes. Main reinforcement bars are 6 mm diameter and 1840 mm long, while stirrups vary from 370 mm to 810 mm depending on their position from top to bottom, ensuring appropriate anchorage and spacing. RCC is specified as the material with lean cement concrete for the mix. This schedule is critical for on-site bar cutting and bending accuracy.

Reference: Bar Bending Schedule

Key foundation guidelines from IRC 25 include:

• Surrounding the foundation with at least 150 mm of lime surkhi concrete or lean cement concrete encasing ramming spalls, moorum, or soil to ensure stability.
• Boundary stones must extend 300 mm above ground level, embedding 600 mm below ground to secure position and durability.
• Reinforcement details as per the Bar Bending Schedule:

These requirements ensure foundation robustness and reinforcement compliance.

Reference: Bar Bending Schedule, Foundation clauses

Installation as per IRC 25 involves adherence to bar bending schedules and spacing norms. The schedule outlines bar types, diameters, and lengths as follows:

Clause 3.1 mentions location and spacing, but specifics are not included here. Proper installation requires following design details and IRC 25 specifications for RCC structures.

Reference: Clause 3, Clause 3.1

While IRC 25 does not explicitly provide detailed formulas or tables related to maintenance, good practice involves ensuring adequate concrete cover to reinforcement, correct spacing for inspection access, and use of durable materials to diminish deterioration risks. The bar bending schedule’s reinforcement specifications (6 mm bars, stirrup lengths, and spacing) support structural integrity and facilitate inspection and upkeep. Adhering to design cover and spacing requirements is essential to prevent corrosion and ease repair efforts.

Reference: Bar Bending Schedule