‘ROMTECH’ lattice girders are offered in a comprehensive range of sizes to suit all sprayed concrete linings.

Any configuration or bespoke design can be accommodated to suit proposed tunnelling sequence or method of operation.
ROMTECH lattice girders are designed to produce a minimum shadow profile to provide effective sprayed concrete encapsulation and are manufactured to ensure dimensional accuracy of the finished components.

DESIGN ADVANTAGES

• Complete encapsulation in sprayed concrete and bonding to the ground results in a true reinforced concrete shell structure that provides a fully interactive ground support with uniform load distribution.
• Flexibility of dimensions, profiles and connections are achievable.
• Combination with other support systems such as steel mesh, fibres, rockbolts, spiles etc.
• Can be readily and accurately modeled, specified and quantified.
• Wide range of standard sections available.
• Bespoke sections readily manufactured.

CONSTRUCTION ADVANTAGES

• Light weight for easy transportation, handling and assembly.
• Supplied in a unit length to suit the excavation and installation sequence.
• Simple connection details.
• Can be easily modified on site.
• Can be erected quickly and spray concreted to provide immediate support.

BENEFITS OF ROMTECH LATTICE GIRDERS

• Fully approved by leading world-wide tunnelling consultants and other authorities
• Tested at an approved UKAS laboratory.
• Jig manufactured to ensure high levels of dimensional accuracy on finished components.
• Full technical assistance provided.
• Designed to produce a minimum shadow profile to ensure effective sprayed concrete placing operations.

SPECIFICATION

• All welding carried out in accordance with BS 7123, with welding personnel and our fabrication facility C.A.R.E.S. approved.
• BS EN ISO 9001 quality assured manufacturing process.

MATERIALS

Bar

• Main bars high yield  grade 500 to BS4449:2005 or plain round high yield to DIN488 BST500S (grade 500)
• Secondary bars either plain round profile or deformed high yield to BS4449:2005 (Min. grade 500).  All UK bar is sourced from C.A.R.E.S. approved steel mills .

Plates

• Flat or angle steel to BS EN 10025:2004 grade S275JR . Higher strength materials can be supplied to customers specific requirements.

Bolts

• Standard nuts and bolts supplied are grade 8.8. Higher strength bolts can be supplied to customers specific requirements.

(Please note the specification of materials may differ depending on the country of manufacture. Please confirm with local supplier.)

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