ANSI ASSP A10.16:2009 (2016) pdf download.Safety Requirements for Tunnels, Shafts and Caissons.
ANSI ASSP A10.16 establishes safety requirements pertaining to the construction of tunnels, shafts and caissons. The requirements set forth in this standard cover environmental control; related facilities; fire prevention; hoisting; haulage; and electrical, drilling and blasting, and compressed air work. This standard is not intended for application to mining or quarrying operations.
1.2 Purpose. The purpose of ANSI ASSP A10.16 is to establish reasonable and practical safety requirements and practices for the construction of tunnels, shafts and caissons.
1.3 Exceptions. The enforcing authority may grant an exception to the literal requirements of this standard or may permit alternative methods if compliance with these requirements presents a greater hazard or significant hardship, is impractical or involves other extenuating circumstances.
2. REFERENCED STANDARDS
2.1 Related American National
Standards. The following American National Standards are referred to, supplement or are related to this document. All provisions of the referenced standards that are applicable to demolition operations shall be observed. When the following American National Standards are superseded by a revision approved by the American National Standards Institute, the revision shall apply:
ANSI/ASSE A1O.33, Safety and Health Program Requirements for Multi-Employer Projects
2.2 Other Standards.
ASME, Boiler Pressure Vessel Code
3. DEFINITIONS
3.1 Air Supply. Compressed air used in the working chamber.
3.1.1 Low-Air Supply. Compressed air used to raise and maintain pressure in the working chamber and in the air locks.
3.1.2 High-Air Supply. Compressed air normally used to activate pneumatic equipment and tools.
3.2 Barricade. An obstruction or barrier to deter the passage of persons or vehicles.
3.3 Blow. A rapid loss of air pressure, which may be caused by a breach of the surface areas in a tunnel being constructed under compressed air conditions. A blow may, or may not, involve a reverse flow of solid or liquid materials (flooding of a tunnel under water, etc).
3.4 Bulkhead. An airtight vertical wall or partition separating the working chamber from free air or from another chamber under a lesser pressure than the working pressure. Generally, one or more air locks pierce the bulkhead, in addition to a number of openings for air pipes and other facilities.
3.5 Caisson. A watertight chamber, usually of wood or steel sheeting, sometimes a cylinder of steel or concrete, used in construction work underwater or as a foundation. When the bottom of the structure extends below the surface of free water and excavation is performed by workers in a working chamber at an air pressure greater than atmospheric pressure,
the caisson is said to be a compressed-air caisson.ANSI ASSP A10.16 pdf download.