Aluminum hydraulic shoring guidance

The hydraulic cylinders must meet specific minimum safe working capacities as outlined in Appendix D to Subpart P.

• 2-inch cylinders must have a minimum 2-inch inside diameter and a safe working capacity of at least 18,000 pounds axial compressive load at maximum extension.
• 3-inch cylinders must have a minimum 3-inch inside diameter and a safe working capacity of at least 30,000 pounds axial compressive load at maximum extension.

The tables in Appendix D provide shoring specifications for different soil types, which must be determined using the classification method in Appendix A of the excavation standard.

• Tables D-1.1 and D-1.2 cover vertical shores for Type A and Type B soils.
• Tables D-1.3 and D-1.4 cover horizontal waler systems for Type B and Type C soils.

You must use the table that corresponds to the soil type identified in your excavation, as required by Appendix D of Subpart P.

For a 12-foot deep trench in Type A soil that is 10 feet wide, you must use 2-inch diameter cylinders with structural oversleeves. According to Table D-1.1 in Appendix D to Subpart P, the shores should be spaced a maximum of 8 feet apart horizontally and 4 feet apart vertically. The oversleeves are required because the trench width is over 8 feet but not more than 12 feet.