Film Faced Plywood for Bridge Pier Tunnel Lining and Retaining Wall Formwork
Overview
Film faced plywood for civil work is a resin coated shuttering panel used where concrete is cast against a formed face on bridges, tunnels and municipal structures: pier shafts and pier caps, abutments and wing walls, box culverts and utility galleries, tunnel portals and cut and cover lining, retaining walls and sea walls. The problems it solves are specific to those structures. Curved and tapered geometry has to be formed without buying a custom steel mould. High pours need a sheet that holds its line under a full lift of concrete. Long runs of identical sections need a panel that strips, cleans and goes back on the next pour with the same dimensions.
1. Cut, Drilled and Backed to Drawing
Civil work rarely uses a panel in its catalog form. On a round pier the sheet is cut into short chords and jointed so the radius reads as a smooth curve instead of a faceted polygon. On a tapered pier or a flared pier cap the panel is cut to the drawing and the offcuts are carried over to the smaller faces, which keeps waste out of the order. Tie rod positions are drilled to the layout rather than marked out on site, and every sawn or drilled edge is sealed again before the panel goes up, because an open edge is where water and grout start working into the plies and where a sheet begins to fail. Cutting and drilling at the mill shortens the site operation on repetitive sections and keeps tie spacing identical from one pier to the next, which matters when the same gang moves down the line.
2. The Same Panel Through a Long Run of Identical Pours
A bridge has a row of piers; a tunnel has length. Both reward a panel that still measures the same after it has been stripped, cleaned and re-oiled a number of times. Glue class and press cycle set how far a sheet travels through that routine before the face softens and the edges start to open. A heavier build and a higher glue class move a panel further up the reuse range, so one set covers a longer run of sections before it is retired. Consistency counts for more than the headline figure: when every panel in the set stays flat and holds its thickness, the second pier face comes out with the same joint pattern and the same setout as the first, with no re-fitting and no patching that has to be colour matched later.
3. Match the Panel Build to the Pour and the Access
Build is chosen against three things on site: the lift height and the support grid behind the panel, the finish the engineer wants on an exposed face, and the way the panel reaches the formwork. Sheets run from 8 mm to 30 mm, so a thin parapet or a shallow wall can be formed with a light sheet while a tall pier shaft takes a thicker build that carries the face across a wider support spacing and keeps the joint line straight. A phenolic film face releases cleanly and protects the plies between pours, and edges are sealed so the sheet survives rain, wash down and storage on an open site. Hand weight decides the rest, since panels inside a tunnel or a closed gallery are carried along the lining and lifted into place with no room for a crane, and a typical sheet at 17 kg to 31 kg is sized for that kind of handling.
Specifications
| Item | Typical specification |
| Material | Resin coated plywood, poplar, eucalyptus, birch or mixed hardwood core |
| Glue line | WBP phenolic for wet sites and repeated stripping, or MR melamine for dry service |
| Size range | 1220 x 2440 mm standard sheet, other sizes and cut to size to drawing |
| Thickness | 8 mm to 30 mm nominal |
| Surface finish | Phenolic film face, sealed edges, cut to size and pre-drilled to layout |
| Panel weight | Typically 17 kg to 31 kg per sheet, depending on size and build |
| Application | Pier shafts and caps, abutments, box culverts, utility galleries, tunnel portals and lining, retaining and sea walls |
| MOQ | Quoted per project |
For detailed dimensions or custom sizes, please contact us.
Where It Is Used
Film faced plywood is specified for bridge pier shafts and pier caps, abutments and wing walls, box culverts and utility galleries, cut and cover tunnel lining and portals, retaining and sea walls, and drainage and water structures on municipal contracts. On this type of work panels are ordered to the structure rather than to the container: cut sizes, drilled tie holes and sealed edges are agreed from the drawing, and the same set is then rotated through the sections in the pour sequence.
Send Your Drawing
Send the pier, wall or lining drawing with the pour sequence and the number of sections, and we will propose the panel build, the cutting and drilling plan and the edge sealing for the job; a sample panel can be supplied for approval before the order is confirmed.