What is the primary purpose of joints in large panel construction?

Joints connect the panels, transfer loads (shear, tension, compression) between them, and provide a seal against weather. Their proper design is critical to the building's stability (Clause 8).

What is a typical tolerance for the overall height of a panel?

For a panel up to 3m high, the permissible deviation in height is ±5 mm (Table 1).

What are the design considerations for handling and erection?

The design must account for stresses during handling, transport, and erection. The location of lifting points is crucial and must be clearly specified to avoid damage (Clause 10).

What is the minimum grade of concrete specified for precast panels?

The minimum grade of concrete for precast reinforced concrete structural elements is M20 (Clause 5.1.1).

IS 11447

: 1985

Code of practice for construction with large panel prefabricates

CurrentSpecializedCode of PracticeBIMStructural Engineering · Planning, Housing and Pre-fabricated Construction

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This code of practice outlines the requirements for the design, manufacture, and construction of buildings using large prefabricated concrete panels. It covers materials, dimensional tolerances, joint design, structural considerations, handling, and erection procedures to ensure safety and quality in precast construction.

Code of practice for construction with large panel prefabricates

Quick Reference Values

Minimum grade of concrete for precast elementsM20

Permissible deviation in length/height of panel (up to 3m)±5 mm

Permissible deviation in thickness of panel±5 mm

Maximum deviation from plumb for full height of building30 mm

Minimum thickness of load bearing wall panel100 mm

Minimum thickness of floor/roof slab100 mm

Practical Notes

Joint design is the most critical aspect of large-panel construction; pay close attention to details for load transfer, weatherproofing, and fire resistance.

Strict adherence to manufacturing and erection tolerances (Table 1 & 4) is non-negotiable for proper assembly and structural integrity.

The code was reaffirmed in 2021, confirming its validity despite its original publication date. It should be read in conjunction with the latest versions of IS 456 and IS 875.