The Technical File | Groundforce

technical@vpplc.com www.groundforce.uk.com Groundforce Shorco | Technical File Issue 3.0 Trench and Manhole Box Struts In a box assembly it is the struts that transmit the forces generated by earth pressures between the opposing walls of the trench. They need to be robustly constructed to accommodate potentially large compressive forces as well as to be able to resist the inevitable accidental impacts incurred in trenching operations. There are three basic types of box strut namely: Fixed length struts. Incrementally adjustable struts. Fully adjustable struts (known as spindles). Due to continuous development of the Groundforce range of box systems, there are several types of struts that can be used throughout the box range, some dedicated to specific box types and some interchangeable. This document will cover struts that can be used in the following box types: Backhoe Type (see section 9.4) - trench and manhole boxes. Standard range (see section 9.2) - mini and standard trench boxes. Manhole box range (see section 9.3). Premier trench box (see section 9.2). The table below indicates the application or each type of strut to each box type and the subsequent pages within this section describe the physical and structural properties of each strut type. An example of a fully adjustable strut (or spindle) An example of an incrementally adjustable strut An example of fixed length strut Box Type Fixed Incremental Fully Adjustable Backhoe Trench Box Compatible Compatible Not Compatible Backhoe Manhole Box Compatible Not Compatible Not Compatible Mini Trench Box Not Compatible Compatible Compatible Standard Trench Box Not Compatible Compatible Compatible Premier Trench Box Not Compatible Compatible Up to 2.5m only Strut Type 4.7m Manhole Box Compatible Compatible Not Compatible Standard Manhole Box Not Compatible Compatible Compatible 9.5.1

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