Maximum extension is to include full range of cylinder extensions as recommended by product manufaturer. (i) 2-inch cylinders shall be a minimum 2-inch inside diameter with a minimum safe working capacity of no less than 18,000 pounds axial compressive load at maximum extension. Aluminum material is 6061-T6 or material of equivalent strength and properties. (1) Vertical shore rails and horizontal wales are those that meet the Section Modulus requirements in the D-1 Tables. The illustrations page is entitled “Aluminum Hydraulic Shoring Typical Installations.”

(6) Figures, illustrating typical installations of hydraulic shoring, are included just prior to the Tables. (5) Miscellaneous notations (footnotes) regarding Table D-1.1 through D-1.4 are presented in paragraph (g) of this appendix.

(4) Information illustrating the use of the tabular data is presented in paragraph (f) of this appendix. (3) Information explaining the use of the tabular data is presented in paragraph (e) of this appendix. (2) Information concerning the basis of the tabular data and the limitations of the data is presented in paragraph (d) of this appendix. Tables D-1.3 and D1.4 are for horizontal waler systems in Types B and C soil. Tables D-1.1 and D-1.2 are for vertical shores in Types A and B soil. Each table contains data only for the particular soil type in which the excavation or portion of the excavation is made. Each table presents the maximum vertical and horizontal spacings that may be used with various aluminum member sizes and various hydraulic cylinder sizes.

(1) Information is presented in tabular form in Tables D-1.1, D-1.2, D-1.3 and E-1.4. Information is presented in several forms as follows: In order to use data presented in this appendix, the soi1 type or types in which the excavation is made must first be determined using the soil classification method set forth in appendix A of subpart P of part 1926. This appendix must be used when design of the aluminum hydraulic protective system cannot be performed in accordance with § 1926.652(c)(2). This appendix contains information that can be used when aluminum hydraulic shoring is provided as a method of protection against cave-ins in trenches that do not exceed 20 feet (6.1m) in depth. Appendix D to Subpart P of Part 1926 - Aluminum Hydraulic Shoring for Trenches

Trenches II