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Tunnel form system
 Tunnel form system is usable for constructing concrete
buildings, in which the walls and slab are executed simultaneously also for
inserting doors and windows and other building installations.
This system is suitable for complex construction in comparison with other
executive systems because of the speed and the quality of execution.
Other advantages of these concrete structures are: long lifespan, less
maintenance and less repairing costs, high resistance for fire, noise
pollution and earthquake, making the rigidity of building.
Special advantages of tunnel form system:
 1. The structure is executed quickly so the capital will not be suspended.
2. The concrete structures have very good quality therefore the rendering
costs will be omitted.
3. L-shape forms are easily moved by crane therefore shuttering costs will
be reduced.
4. The forms are adjustable to different sizes so they can be used in
different projects.
5. The forms are durable and have long lifespan.
Parts of tunnel form system
Tunnel form system includes the bearing wall forms as the vertical element
and floor slabs which are concreted in-situ. This system includes
below-mentioned parts:
1. Walls vertical form
2. Slab form (the width is equal half of two opposite walls spans)
3. Vertical form of the end wall of span
4. Special oblique props for adjusting the angle of slab form and for
sustaining the loads.
5. Special vertical props with wheel to adjust the height and the angle of
slab form and for sustaining the loads
6. Vertical adjustable bolts under the wall form
7. The wheels which are under wall forms for moving L-shape pieces also for
transferring them to the lower platforms
8. Landing platform which is installed on lower stage and moves L-shape
pieces to upper stages by tower crane
9. Lifting beam for moving L-shape forms
10. Opening forms
11. Outside forms with truss system or special oblique props
12. External bracket
13. External concrete pouring platforms
14. Finishing scaffold of external bracket
Construction with tunnel form system
 To construct a building with tunnel forms, at first foundation is executed,
dowel bars are placed in walls position and then kicker is executed. After
that reinforcement is done by welded mesh and the tunnel form is moved to
wall executing position by tower crane. In tunnel form systems each slab is
executed between two walls and by two forms which cover the span. Then the
wheels are disconnected from executed slab by adjustable bolt, and the form
overlaps kicker concrete. Therefore it is adjusted by special vertical and
oblique props.
After shuttering L-shape forms and slab reinforcement, kicker angle forms
are assembled at the top of reinforcement of slab that can be executed lower
walls and slab with upper kicker simultaneously. This kicker is executed in
order to make disassembling easier. Wall forms are anchored to each other by
tensile bolts.
 When concrete pouring and hardening were done, the piece which connects slab
forms of two L-shape pieces will be separated. Then L-shape pieces are
separated from concrete by adjustable bolts and special oblique props, so
the wall form is coming down on wheels. Each L-shape form (Half shell) goes
out of span and is installed on landing platform at lower stage. Then
lifting beam is installed and the form is ready to be used for the next
stages.
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