Marine Ties – Threaded Bar
Shoring systems for marine structures such as sheet pile retaining wall needs support at the top. This is achieved using a tie rod anchoring system (mostly horizontal or at a shallow angle) which is tied back to the anchor wall constructed at a distance from the main wall. Anchoring can also be done using grouted anchors. For details, refer Applications - Ground Anchors.
Due to reliability and ease of installation, threaded bar anchoring system is suitable for marine tie applications. Wide range of anchorage components and bar connectors are available, which allows easy installation and easy connection to any type of shoring system. For threaded bar system, a notching factor (kt) of 1.0 can be used, thanks to its hot rolled thread.
Benefits of Threaded Bar System
- Steel bars can be cut and coupled without any additional threading at site to connect couplers
- Splicing of bars using coupler is easy
- Threads being hot rolled and with coarse pitch make it screw-able in challenging site conditions, thus making it best suited for geotechnical applications
- High relative rib area provides maximum bond stress between steel bar and cement grout
Threaded Bars are available in
- 500/550: Ø16 - 75 mm
- 550/620: Ø20 - 75 mm
- 670/800: Ø18 - 75 mm
- 950/1050: Ø18 - 75 mm
Waling System
Walings stiffen and align the sheet pile wall and transfer the loads from the sheet pile wall to the anchors. Walings are normally provided on the inside of the main wall as a tension member, whereas at the anchor wall it is provided at the rear as a compression member.
Walings usually comprises of two steel channels placed back to back, with space between the channels to allow the tie rods to pass through. Splice connections can either be bolted or welded. For bolted splice connections, channel sections are supplied with necessary ready to install bolt holes. The waling sections are pre-drilled for the splice on one side of the joint, whereas the other side is supplied plain for cutting and drilling on site. Walings are supported on welded brackets.
As part of the waling system, we supply full range of waling bolts and accessories to suit project needs. Waling bolts are offered either with head and nut, or with two nuts.
Corrosion Protection
Based on the aggressiveness of the environment and design working life, various types of corrosion protection systems are available.
- Wrapping System: These are cold applied protection tapes (for e.g. Denso) that are impermeable against water and oxygen, as well as electrically insulating.
- Hot Dip Galvanizing: In accordance to EN 1461, BS 729 or ASTM A153
- Epoxy Coating: In accordance to BS 7295, ASTM A934 or ASTM A775
- Heat Shrink Sleeve: Provides a permanent corrosion protection. After shrinkage, the wall thickness shall have a minimum thickness of 1 mm.
- Double Corrosion protection (DCP): Factory grouted DCP bars offer a permanent protection for installations in aggressive environment.