01
Lighter handling than H-beam profiles
Lattice girder rings are commonly selected to reduce handling weight versus traditional H-beam arch profiles, helping crews position longer sections more easily after excavation.
Systematic tunnel support
Lattice girders for tunnel excavation and lining support.
Steel lattice girder arches fabricated from 3-bar or 4-bar round-bar assemblies for systematic tunnel support, shotcrete integration and reinforced lining applications.
Product overview
A lighter, open steel arch support system for NATM-style tunneling works.
DIVIDAC lattice girders are designed as systematic tunnel support arches. The product concept uses main round bars connected by secondary bars and connectors, forming an open steel profile that can be embedded with shotcrete to act as a reinforced support element.
The open lattice configuration is especially useful where the support system needs to follow an excavated tunnel profile, receive shotcrete through and around the steelwork, and provide early-stage support during the excavation cycle.
- Profile arch support for tunneling excavation.
- Rebar support girders for concrete lining works.
- Portal, shaft and underground opening support applications.
- Project-specific geometry, bar diameter and connection details available for review.
Key selling points.
Position lattice girders as a practical alternative to conventional solid steel profiles when shotcrete integration, installation speed and profile adjustability matter.
02
Better shotcrete integration
The open round-bar structure allows shotcrete to pass through the girder, reducing blind-angle problems behind solid steel profiles and helping the support behave more like a uniform reinforced concrete lining.
03
Adjustable to the excavation profile
Compared with the stiffness of H-beams, lattice girders can be adjusted more easily to suit real excavation profiles where the tunnel face is not perfectly formed.
04
Early support for excavation cycles
The system is used to gain early bearing capacity after excavation and before the lining reaches final strength, supporting the tunnel profile during the construction sequence.
05
Reduced rebound and improved bonding
Because the girder does not create the same solid obstruction as an H-beam, shotcrete can bond more effectively around the support profile with less rebound and less void risk.
06
Configured to project loading needs
3-bar and 4-bar configurations allow the support geometry and load capacity to be matched to the tunnel design, ring spacing and lining requirements.
Available design concepts.
DIVIDAC can discuss lattice girder selection based on tunnel profile, required support height, loading demand and installation sequence.
Spider connector type
Three main bars connected with spider-style bracing. Suitable for systematic steel arch support where a lighter support section is required.
Butterfly connector type
Four main bars connected with butterfly-style bracing for higher support demand and increased arch section capacity.
Rectangular cage profile
Four-bar cage concept where reinforcing bars form a rectangular support element for project-specific support geometry.
Specification discussion
Designed around project drawings, tunnel profile and loading requirements.
For tender or project review, DIVIDAC can discuss the lattice girder type, height, bar diameter, connection plates, bolts, nuts, welding requirements and ring spacing against the project specification.
Typical specification topics include main bar grade, secondary/link bar material, connector details, connection/base plates, screw bolt grade, screw nut standard, welding procedure and quality documentation.
Information to provide
- Tunnel profile or lining drawings.
- Required girder type: 3-bar, 4-bar butterfly or cage design.
- Girder height, bar diameter and ring spacing.
- Material standard and welding requirements.
- Connection plate, base plate, bolt and nut details.
- Estimated quantity, delivery location and schedule.
Application areas.
Lattice girders are commonly considered for tunnel excavation support, portal and shaft works, and concrete lining reinforcement packages.
Tunnel excavation support
Systematic steel arch reinforcement for excavated tunnel sections, especially where sprayed concrete is applied around the support profile.
Portal and shaft support
Profile arch support for tunnel entrances, shaft foundation interfaces and underground opening transitions.
Concrete lining reinforcement
Rebar support girder concept for reinforced concrete lining works and shotcrete-integrated support systems.
Need lattice girders for a tunnel package?
Send the tunnel profile, drawings, preferred girder type, bar diameter, standards, quantity and delivery schedule for project review.