The Technical File | Groundforce Groundforce Shorco | Technical File Issue 3.0 Rolling Strut Trench Box Technical Specification - Rolling Struts and Extension Bars Roller axial capacity (R): R T = 100kN (tension) R C = 639kN (compression) - global FOS =1.65. Roller centres: 1000mm. Extension bars: Fabricated Section size: 390mm (height) x 220mm (width), Cross Sectional Area (A): 144cm² Moment Capacity (Mx): 455.7kNm (global FOS =1.65) Moment Capacity (My): 206.5kNm (global FOS =1.65) Extension bars joints Flange: 590mm x 250mm Bolted connection: 4No. M30 (grade 10.9) bolts c/w washers – 1350Nm torque required Joint Moment capacity (Mx): 209.3kNm (global FOS =1.5) Joint Moment capacity (My): 67.0kNm (global FOS =1.5) Strut locations and limit pins The Rolling Strut can be positioned at any one of five possible positions along the post depending on the required capacity of the box and under strut clearance. Limit pins are inserted in pre defined slots in the posts above and below the roller carriage so as to limit the range of movement of the strut; see diagram below. Refer to the user guide for more information on the correct use of limit pins. Note: Clearances will be reduced by 270mm if the standard limit pin is used below the roller. Clearance Below Strut (m) Allowable Panel Pressure (kN/m²) 1.775 35.6 2.295 35.6 2.565 35.6 2.835 29.0 3.105 23.8 10.2.3