(a) A limited access zone shall be established whenever a masonry wall is being constructed. The limited access zone shall conform to the following.
(1) The limited access zone shall be established prior to the start of construction of the wall.
(2) The limited access zone shall be equal to the height of the wall to be constructed plus four feet, and shall run the entire length of the wall.
(3) The limited access zone shall be established on the side of the wall which will be unscaffolded.
(4) The limited access zone shall be restricted to entry by employees actively engaged in constructing the wall. No other employees shall be permitted to enter the zone.
(5) The limited access zone shall remain in place until the wall is adequately supported to prevent overturning and to prevent collapse unless the height of wall is over eight feet, in which case, the limited access zone shall remain in place until the requirements of paragraph (b) of this section have been met.
(b) All masonry walls over eight feet in height shall be adequately braced to prevent overturning and to prevent collapse unless the wall is adequately supported so that it will not overturn or collapse. The bracing shall remain in place until permanent supporting elements of the structure are in place.
Sec. Appendix A to Subpart Q of Part 1926--References to subpart Q of
Part 1926
(This appendix is non-mandatory.)
The following non-mandatory references provide information which can be helpful in understanding and complying with the requirements contained in subpart Q.
Accident Prevention Manual for Industrial Operations; Eighth Edition; National Safety Council.
Building Code Requirements for Reinforced Concrete (ACI 318-83).
Formwork for Concrete (ACI SP-4).
Recommended Practice for Concrete Formwork (ACI 347-78).
Safety Requirements for Concrete and Masonry Work (ANSI A10.9-1983).
Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens (ASTM C39-86).
Standard Test Method for Making and Curing Concrete Test Specimens in the Field (ASTM C31-85).
Standard Test Method for Penetration Resistance of Hardened Concrete (ASTM C803-82).
Standard Test Method for Compressive Strength of Concrete Cylinders Cast In-Place in Cylindrical Molds (ASTM C873-85).
Standard Method for Developing Early Age Compressive Test Values and Projecting Later Age Strengths (ASTM C918-80).
Recommended Practice for Inspection and Testing Agencies for Concrete, Steel and Bituminous Materials as Used in Construction (ASTM E329-77).
Method of Making and Curing Concrete Test Specimens in the Laboratory (ASTM C192-88).
Methods of Obtaining and Testing Drilled Cores and Sawed Beams of Concrete (ASTM C42-87).
Methods of Securing, Preparing and Testing Specimens from Hardened Lightweight Insulating Concrete for Compressive Strength (ASTM C513-86).
Test Method for Comprehensive Strength of Lightweight Insulating Concrete (ASTM C495-86).
Method of Making, Accelerating Curing, and Testing of Concrete Compression Test Specimens (ASTM C684-81).
Test Method for Compressive Strength of Concrete Using Portions of Beams Broken in Flexure (ASTM C116-68 (1980)).