Tunnel form is a formwork system that allows the contractor to
cast walls and slabs in one operation in a daily cycle. It combines
the speed, quality and accuracy of factory/off-site production with
the flexibility and economy of in-situ construction and is
recognised as a modern method of construction (MMC).
The result is a cellular reinforced structure, the surfaces of
which are sufficiently high quality to require only minimal
finishing for direct decoration, while the end walls and facades
are easily completed with thermally insulated units that can be
clad as required.
The system creates an efficient load-bearing structure for use
in a wide variety of applications. It is particularly effective in
projects suited to repetitive cellular construction such as
residential blocks, hotels, student accommodation, barracks and
Tunnel form systems are able to provide cost-effective, high
quality construction, generating significant savings in time and
costs over alternative methods without compromising on design. The
system is now one of the most preferred methods of cellular
construction with architects, engineers and contractors throughout
the world, whilst client appreciate tunnel form’s ability to
deliver projects to budget and on time.
The formwork is specially adapted for each project. The
repetitive nature of the system and the use of prefabricated forms
and reinforcing mats/cages simplifies the whole construction
process, producing a smooth and fast operation. The techniques used
are already familiar to the industry, but with tunnel form
construction there is less reliance on skilled labour.
Quality is enhanced despite the speed of construction. The
precise, even steel face of the formwork creates a smooth, high
quality finish capable of receiving direct decoration with the
minimum of preparation (a skim coat may be required). This reduces
the requirement for following trades, thus providing additional
cost savings and speeding the entire process.
The large bays constructed using tunnel form provide exceptional
flexibility in the design and layout of the building and allow a
high degree of freedom in the final appearance.
Tunnel form has integral working platforms and edge protection
systems. In addition, the repetitive, predictable nature of the
tasks involved encourages familiarity with operations, and, once
training is complete, productivity improves as construction
progresses. The minimal requirement for tools and equipment when
moving the tunnel form further reduces the risk of accidents on
The insitu casting of units on site and the local availability
of ready-mixed concrete supplies reduce transportation impacts.
Just-in-time deliveries and near zero wastage produce an overall
tidier site with associated cost savings and safety benefits.
Concrete’s thermal mass coupled with correct insulation and
boiler design minimises heating costs and can even reduce