Hi-Clear Manhole Box

Hi-Clear Manhole box posts allow the connection of a base unit to a top unit, providing a 4m high box with only two struts as opposed to three. The lower strut is positioned higher in the assembly as to provide the added benefit of greater under-strut clearance. This improves height-to-width ratio, a crucial requirement when large diameter pipes and chambers need to be installed. The Hi-Clearance system uses a unique fixed length strutting system that is available in three different lengths.

Provides high clearance below lower strut of 2260mm
Top combinations configure boxes up to 5.5m deep x 4.0m wide
Ideal for large diameter chamber pipe work and culverts
Robust, width-adjustable system
Eliminates one level of strutting Available for all standard manhole boxes in the range except for the 4.7m and backhoe versions.

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Strut Designation	Overall Length (mm)	Pin to Pin Length (mm)	External Box Width (mm)	Internal Box Width (mm)	Weight (kg)	Allowable axial compressive force (kN)	Allowable axial tensile force (kN)
1.25m	1250	1168	3008	2788	75	+500.0 (FOS = 1.6)	-266.0 (FOS = 1.6)
1.75m	1750	1668	3508	3288	90
2.25m	2250	2168	4008	3788	110

Strut Designation

Overall Length (mm)

Pin to Pin Length (mm)

External Box Width (mm)

Internal Box Width (mm)

Weight (kg)

Allowable axial compressive force (kN)

Allowable axial tensile force (kN)

1.25m

1250

1168

3008

2788

+500.0

(FOS = 1.6)

-266.0

(FOS = 1.6)

1.75m

1750

1668

3508

3288

2.25m

2250

2168

4008

3788

110

Trench Boxes: Typical Installation Methodology

This quick and easy method ensures ground stability within a trench and helps minimise the excavation area to avoid damage to neighbouring structures and utilities in the ground. This methodology is best suited for trench boxes with shorter struts, if you use a trench box with long struts then other methods may be more suited, if you have any questions on different methods you can use contact our technical department.

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