Underground support is not a place for a close-enough substitution. A bolt, a strap and a mesh panel may arrive in separate bundles, but the project's support design depends on them working together. Their dimensions, fixing arrangement and installation requirements have to match that design.
Rainbow Steels manufactures mesh and ground-support products for mining and infrastructure work. Our role is to supply the agreed material with clear dimensional requirements, checks and lot identification. Selection, spacing, loading and installation remain the responsibility of the project's qualified geotechnical or engineering team.
Mesh retains the surface between support points
Welded wire mesh forms a surface-retention layer in a designed support arrangement. Its wire diameter, opening and panel dimensions must match the approved requirement, including how it fits around support points and adjacent panels.
A mesh order should therefore carry more than a total area. Include the drawing, dimensions, finish and quantity breakdown. Any overlap, fixing or site cutting requirement should come from the approved support plan, not an assumption made during procurement.
Rock bolts provide defined support points
Rock bolts are specified as part of the project's ground-support design. Their length, bar details, threads, anchorage arrangement and associated fittings need to be defined together. A bolt that is the right length but has the wrong connection detail can still create a problem at installation.
The Rainbow Steels rock bolt catalogue includes 1.8 m and 2.4 m lengths. Confirm the required product and fitting details against the project drawing. Catalogue availability does not establish suitability for a particular rock condition or design load.
W straps connect the surface-retention arrangement
W straps are formed steel straps used within designed ground-support systems. Their profile and punched hole pattern help coordinate the arrangement between fixing points and the retained surface.
For procurement, state the strap length, profile, material requirement, finish and hole spacing from the approved drawing. Hole locations are not a minor manufacturing detail: they must align with the intended support layout. Rainbow Steels punches and forms straps to the agreed requirement, rather than asking the site to accept an unspecified alternative.
Do not interchange tendon types without approval
Cable bolts and split sets are also part of the Rainbow Steels ground-support range. They are distinct products with different design and installation requirements. They are not automatic replacements for a rock bolt because one is available sooner or appears similar in a quotation.
Any proposed substitution should go back to the responsible engineer for approval. Procurement should then update the drawing reference and order description so the approved change is clear to everyone involved.
Confirm compatibility before placing the order
Bring the full support requirement together before requesting supply:
- Approved support drawing and revision.
- Product types and dimensions for each item.
- Thread, fitting and connection details where applicable.
- Mesh dimensions, wire diameter and aperture.
- Strap profile and punched hole pattern.
- Material, coating and inspection requirements.
- Quantities, bundle marking and delivery sequence.
Separating these details across informal messages makes it harder to identify a mismatch. A coordinated schedule gives the manufacturer and the site team one agreed reference.
Checks and traceability matter after despatch
The material gate, production operation and finishing stage are the points Rainbow Steels watches closely. Dimensional and coating checks take place before release, and lot identification connects a delivered bundle to the run that made it.
That does not replace site inspection or the project's installation procedure. It gives the project team a clearer supply record and a manufacturer to speak to if a question appears on site.
Supply tied to the development programme
A support system delivered out of sequence can leave the right material in the wrong place. Share the delivery window, site destination and staged quantities when you enquire. Our team can then review the manufacturing and despatch requirement alongside the specification.
Since 1997, Rainbow Steels has built its work around product quality, finish and delivery commitments. Send your approved support schedule so we can discuss the supply without guessing at the design.
Ground-support supply from West Bengal
Our manufacturing unit is in Hooghly, West Bengal, with a corporate office in Kolkata. Send your approved support drawing and delivery schedule to sales@rainbowsteels.com. The same specification and checks apply wherever the project is located.