Bored Pile minimum Tie Reinforcment as per Eurocode

 

Introduction

When designing bored piles, ensuring adequate tie reinforcement is crucial for structural integrity and compliance with standards. The Eurocode, particularly EN 1536, provides clear guidelines on the minimum transverse reinforcement (ties or hoops) for bored piles. This article highlights the key requirements and recommendations for minimum tie reinforcement based on Eurocode provisions.

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Key Requirements from EN 1536

According to EN 1536, transverse reinforcement for bored piles is specified as follows:

1. Minimum Diameter of Ties or Hoops:

   • The diameter of the transverse reinforcement must be:
     • At least 6 mm, and
     • Greater than or equal to one-quarter of the maximum diameter of the longitudinal bars.
     • This ensures sufficient structural support and confinement of the pile.

2. Spacing Requirements:

   • The spacing of transverse reinforcement must comply with design rules to ensure proper concrete placement and structural confinement.

3. Types of Transverse Reinforcement:

   • Options include links, hoops, or helical reinforcement, as shown in Table 5 of EN 1536.

Design Notes and Recommendations

• At least six longitudinal bars are recommended for bored piles (with exceptions for small-diameter piles).
• Transverse reinforcement must be tied or welded at all intersections with longitudinal bars for additional stability.
• Adequate concrete cover must be maintained to prevent corrosion and ensure durability.

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Reference Details

For a detailed explanation, refer to the following sections of EN 1536:

• Section 7.6.3.2 (Page 24): Recommended diameters of transverse reinforcement.
• Table 5: Minimum tie reinforcement specifications.
• Section 7.6.2.9: Spacing and placement recommendations.