BS 7973-2:2001
$102.76
Spacers and chairs for steel reinforcement and their specification – Fixing and application of spacers and chairs and tying of reinforcement
| Published By | Publication Date | Number of Pages |
| BSI | 2001 | 22 |
This part of this British Standard specifies fixing and application requirements for spacers and chairs sufficient to achieve and maintain cover to reinforcement in in situ reinforced concrete members subject to normal construction loads. Application requirements include tying and spacing.
This British Standard applies to all types of reinforcement conforming to BS 4449 and BS 4482 and some types of welded fabric conforming to BS 4483, supplied to the preferred shapes and tolerances given in BS 8666.
Other important aspects such as clear and unambiguous detailing, the need to consider buildability, formwork tolerances and reinforcement are not specified. Standards of workmanship and supervision are also outside the scope of this British Standard as is a means of resisting wind loads or enabling the lifting of prefabricated reinforcement cages.
NOTE 1 Where appropriate, the basic principles can be applied to precast concrete or proprietary systems.
NOTE 2 Straight reinforcement for curvilinear members to be formed to a radius exceeding the maximum radius of bending given in BS 8666 may require extra tying and support to resist additional loads caused by the springing effect of the bars.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British�Standard |
| 3 | Contents |
| 5 | 1 Scope 2 Normative references 3 Terms and definitions 3.1 tying wire 4 Designations and symbols |
| 6 | 5 Tying of steel reinforcement 5.1 General 5.2 Tying within slabs 5.3 Tying within beams 5.4 Tying within columns 5.5 Tying within foundations 5.6 Tying within walls 6 General requirements for spacers and chairs 6.1 Cover shall be achieved by using factory made spacers and chairs manufactured according to BS… 6.2 The requirements for beams and slabs shall apply to their equivalent foundation members, such… 6.3 A spacer or chair shall maintain the reinforcement in the position specified on the structura… 6.4 Spacers shall be fixed to the links, fabric or reinforcement nearest the face of the concrete… 6.5 If coloured, textured, profiled or exposed aggregate finishes to the concrete are required, s… |
| 7 | 6.6 Spacers with a suitable bearing area shall be used where cover is required between reinforcem… 6.7 When steel chairs are required to support reinforcement off an exposed face, the ends of each… 7 Spacers and chair categories and applications Table 1 Applications for spacers and chairs in terms of category 8 Spacing of spacers and chairs 8.1 Spacers and chairs within slabs |
| 8 | Figure 1 Spacers for bottom reinforcement in slabs |
| 9 | Figure 2 Continuous chairs for top reinforcement in slabs with bottom reinforcement |
| 10 | Figure 3 Chairs for top reinforcement in slabs without bottom reinforcement |
| 11 | Figure 4 Circular chairs for top reinforcement in slabs with bottom reinforcement |
| 13 | Figure 5 Spacers for slab edges |
| 14 | Figure 6 Spacers for ribbed slabs |
| 15 | 8.2 Spacers within beams 8.3 Spacers within columns |
| 16 | Figure 7 Spacers for beams |
| 17 | Figure 8 Spacers for columns |
| 18 | 8.4 Spacers and chairs within foundations 8.5 Spacers and chairs within walls |
| 19 | Figure 9 Continuous chairs for walls |
