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How does safety helmet function?

The main principle of safety helmet is to protect workers against impact by falling objects or struck by swinging object by energy absorption. Upon hitting by an object, the helmet dissipates some of the energy in the following mechanisms:

(i) Stretching of harness inside the helmet;
(ii) Partial damage of outer shell of helmet.

The remaining energy is then evenly spread around the head to reduce the hitting stress on worker’s head.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

What are the IS codes used for Clay and Stabilized Soil products for Construction?

Following are the IS codes which are used for Clay and Stabilized Soil products for Construction. It includes standardization in the field of burnt, unburnt clay and stabilized soil products for construction.

IS 654:1992 Clay roofing tiles, mangalore pattern – Specification.

IS 1077:1992 Common burnt clay building bricks – Specification

IS 1464:1992 Clay ridge and ceiling tiles – Specification

IS 1478:1992 Clay flooring tile – Specification

IS 1725:1982 Specification for soil based blocks used in general building construction

IS 2117:1991 Guide for manufacture of hand-made common burnt clay building bricks
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What are the IS codes used for Construction Management?

Following are the IS codes which are used for Construction Management including safety in construction. It also includes planning and organization at site for residential buildings, public buildings and offices, and industrial buildings, formulation of standards laying down safety requirements in the various operations involved in different types of civil engineering construction.

IS 3696(Part 1):1987 Safety code of scaffolds and ladders: Part 1

IS 3696(Part 2):1991 Safety code of scaffolds and ladders: Part 2

IS 3764:1992 Code of safety for excavation work

IS 4014(Part 2):1967 Code of practice for steel tubular scaffolding: Part 2 Safety regulations for scaffolding

IS 4081:1986 Safety code for blasting and related drilling operations
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What are the IS Codes for Public Health Engineering?

Following are the IS codes which are used for standardization in the Public Health Engineering including standardization in the field of water supply, drainage and sanitation in buildings, including laying of pipelines, small sewage treatment plants, ancillary structures for water supply and sewerage and standardization of equipment used in public health engineering including their design, manufacture, testing, operation and maintenance

IS 1172:1993 Code of basic requirements for water supply,drainage and sanitation

IS 1742:1983 Code of practice for building drainage

IS 2064:1993 Code of practice for selection, installation and maintenance of sanitary appliances

IS 2065:1983 Code of practice for water supply in buildings

IS 2470(Part 1):1985 Code of practice for installation of septic tanks: Part I design, criteria and construction
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What are the IS Codes for Fire Fighting?

Following are the IS codes which are used for standardization of Fire Fighting including standardization in the field of Fire Fighting Equipment Including Water Fittings, Fire Fighting Units, Fire Detection And Fire Alarm Systems, Helmets, Equipment For Fire Protection And Fire Fighting, Personal Safety – Protective Clothing and Equipment.

IS 884:1985 Specification for first-aid hose reel for fire fighting

IS 901:1988 Specification for couplings, double male and double female, instantaneous pattern for fire fighting

IS 902:1992 Specification for suction hose couplings for fire fighting purposes

IS 903:1993 Specification for fire hose delivery couplings, branch pipe, nozzles and nozzlespanner

IS 904:1983 Specification for 2-way and 3-way suction collecting heads for fire fighting purposes
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