Pre and post concreting checks

Tolerances in field of civil engineering

1. Amardeep Singh

2. To enable systematic process within reasonable cost and time. To have standard Quality System . Measuring constructed works against Workmanship standards, Drawings and Specifications. Acceptable Quality /Tolerances for Concrete Works. Independent Structure report. Address Corrective action.

3. Visual Free from Defects. No gaps at joints. Interiors free from debris. Adequate support, bracing and tie-back Dimensions Cross-sectional dimensions as per drawing. Penetration / opening for services. Length of precast members (major dimension of unit). Alignment Departure of any point from its position. Verticality. Mean level of staircase thread to temporary benchmark. Level for cast in-situ elements.

4. Visual Surface Defects -cracks/ damaged threads Twist/ bend/ warpage . Application of sleeves Dimensions Numbers as per drawings. Sizes as per drawings. Inclination of Pockets for smooth extraction after pouring. Alignment/Fixing C/C distances between Bolts/Pockets . Verticality . Stability of Fixing arrangement (welding in case of Bolts/IPs). Removability of Pockets

5. Dimension for elements / opening for services Cross-sectional dimension of cast in-situ and precast elements. Required opening for services. Precast members: Length Straightness or bow (deviation from intended line) Dimension Twist Flatness

6. Alignment, plumb and level Departure of any point from its position. Verticality Deviation from mean level. Camber at mid span Exposed surface No visual exposure of coarse aggregates. Cold joint & formwork joint must be smooth. No bulging of structural elements. Free from formwork, nails, zinc strips, etc.

7. Lifting points / inserts Free from Damages. Position / Placement Sleeve System / Connections Free from concrete droppings or corrosion. Sleeves, grout holes, grout tubes not congested with debris. Position / Placement. Bar protrusion length according to requirements. Bars should be free from bending, cracks or damages.

8. Interface / Joint R equirements Alignment of horizontal and vertical joint. Joint taper alignment. Jog in alignment of matching edges Sitting of element as per specifications. Installation of sealant and waterproofing as per specifications. Cast-in steel items / welded & bolted connections Position of embedded steel items / Pockets as per drawing. Position of openings for bolt connections. Other requirements as per drawing.