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Tunnel formwork is a system that allows of walls and slabs in one operation on a daily cycle. construction durations are reduced significantly by this rapid system when compared to conventional methods. tunnel form system brings speed, quality and accuracy to concrete construction and provides big savings in finishing and M&E works.Thesaving from less workmanship & duration can reach up to almost 50% . Tunnel form can be reused up to 500 times without any recanditioning. Hi-tech technologies for steel formwork prodution make tunnel form strong & durable.

* Tunnel formwork system provides project completion with least work manaship costs.

* Smooth cincrete surfaces and dimensional accuracy eliminates finishing works like plastering.

* The system crares efficient load-bearing structures whichare known as the most eaethquake resistant structures.

MESA IMALAT was founded in 1978 as a member of MESA GROUP OF COMPANIES in Ankara. The objective at the beginning was to design & manufacture of tunnel formwork system after short time however, MESAIMALAT extended her product range with all other types of hi-tech formwork & scaffolding systems.

MESAIMALAT has obtained a significant market share both in domestic and worldwide construction markets by offering a wide range of products with an annual production capacity of 150,000 m² of steel formwork systems, 300,000 m² of plywood formwork systems, 1.000000 m³ of slab formwork & scaffolding systems. MESA Formwork Systems has been used in almost 40 countries for hundreds of prestigious superstructure and infrastructure construction projects.

MESA IMALAT always combined her engineering skills and experience in an innovative fashion to upgrade products using latest manufacturing technologies. In due course worldwide approved & certified high quality products, unlimited technical support and after-sales services enable MESA IMALAT to carry on serving the construction industry with confidence as a company who is committed to customer satisfaction and permanent product quality.

TUNNEL FORMWORK SYSTEM (TRTF)

Established n 1978, Mesa Imalat has reached 30.000 m² of closed production area and exports tunnel formwork to 40 countries in 5 continent.

Celebrating proudly her 30th year Mesa Imalat is not only leader in domestic market but also became “worldwide preferred trademark” of tunnel formwork with hi-tech products and commitment to customer satisfaction.

Tunnel Form System maximizes construction quality.

Smooth surfaces are obtained with tunnel form in each concreting although it is used again and again.

These smooth surfaces do not require plaster, dimensions are perfect and precise. Thanks to this, assembly times for standard complementary construction component are shortened.

It prevents loss of forest products used as formwork material.

It provides maximum saving in construction materials (iron, nail, wire, brick, lime, etc.)

Tunnel Form System can be used at any place where cement is available.

Construction materials and reinforcement required can be transported to the worksite easily.

Since day one MESA IMALAT was established by a dynamic group of highly technical staff with strong engineering background. MESA IMALAT designed innovation products and improve them connecting experience with engineering skills.

It is our priority target to provide the most suitable and smart formwork solution to every construction project by working in a customer-oriented fashion. In order to reach this target we are offering all necessary technical support as a solution partner to our customers starting from the first day of their project until completion.

MESA IMLAT’s production lines are designed with latest production technologies. State-of-the-art machineries have been developed to manufacture specific products which enable us to improve our quality standards and production speed.

AFTER SALES SERVICE & TRAINING

“After sales service” is an integral part of MESA IMALAT’s company policy.

Our experienced technical personnel will be at our customer’s service on-site wherever their project is located around the world.

At all projects the assembly of formwork and first casting of concrete will take place under the supervision of MESE IMALAT’s technical staff. in this manner not only the correct implementation of the system is secured but also training of contractor’s site personnel is achieved.

In accordance with our quality system and customer-oriented service policy the maximum importance is given for the training of MESA personnel. In the meantime MESA IMALAT offers to her customers training % certification programmers relates to safe and proper implementation of formwork systems.

Main feature of tunnel form system is to transform building construction almost into an industrial production line by systemizing daily works into repetitive activities like a factory production which eventually provides highest efficiency on site with daily concrete casting cycle.

In order to optimize the volume of formwork, equipment & workforce overall structure is divided into a number of more or less similar construction phases, size most of the times corresponding to daily work to cast concrete.

To maximum efficiency, it is important that the phases done everyday are similar. Repetition saves a lot of time on site, as the workers know precisely what they have to do at any times of the day.

To catch daily cycle and fast project completion, MESA IMALAT always studies complete set of construction drawings and provides formwork solution in advance before the concrete works start at site. Thus any loss of time spent to find on-site solutions are eliminated by tunnel form system.

The following items should also be considered for an efficient implementation of tunnel form system;

· Steel wire mesh should be preferred as structural reinforcement. All rebar works should be done at steel prefabrication area in advance to speed up installation.

· Usage of suitable crane is crucial. Tower crane should be used for structures with certain height and floor area.

	Construction of the foundation is completed.
	Before the first casting with tunnel form, kickers should be cast in order to position the load bearing concrete walls. Kicker forms are placed by a surveyor.
	Kickers are cast and elevation code lines are marked on the kickers.
	Wire mesh and rebar for walls are put in place. While installing the wire mesh, it is important to install perpendicular to the slab and make sure that joints are with required angle.

	First half-tunnel is placed to its location by a suitable tower crane in accordance with the formwork layout. Surface of tunnel forms are lubricated by appropriate mineral oil for easy separation. Cones for adjusting wall thickness & tie rods for fixation of forms are placed. Electrical conduits are installed.
	Bottom of tunnel form is set leveled with line marked on the kickers by the kickers by the help of jacks mounted on the vertical panels.
	Wire-mesh overlapping with cones is cut.
	Box-outs for door/window opening are assembled on tunnel form. Box-out’s jacks are released until they contact to floor.

	2^ndhalf-tunnel is placed to its location and similar operations are repeated. Two half tunnels are coupled by connectors to complete one tunnel unit. Cones and tie-rods are placed for connection to next tunnel unit. Verticality is adjusted by the help of the jacks located at the wheels of tunnel form.
	Conical hooks are locked on the conical bolts located at the connection of two half tunnels and 2mm spacing between half tunnels is obtained.
	Tie-rods installed with suitable washer and wing-nuts.
	Tie-rods placed as if they stay inside the cones and don’t come out.

	Tie-rods are tightened only after adjusting verticality of the tunnel form.
	Slab reinforcement bars and wire mesh is placed. Kicker forms for next floor level are mounted on the tunnel at the desk and the slab is made ready for concreting.
	All tunnel units are placed to their locations after repeating same operations done for the first tunnel unit. Later mechanical and electrical installations are done at the slab.
	Horizontal leveling is adjusted by the help of wheeled-props. Middle and upper tie-rods are tightened.

	Horizontal leveling is adjusted by the help of wheeled-props. Middle and upper tie-rods are tightened. Kicker spacers are located at every 1250mm. box-outs for slab openings are assembled and its rebar is installed. Concreting climate conditions, tunnel opening are closed by special blanket inside each tunnel unit to speed up curing in cold weather.
	Concreting starts. Leveling of slab concrete must be at lower of kicker forms. Kicker concrete level must be aligned to upper level of kicker form. Concrete between kicker upper level & wire mesh must have trowel finish.
	Early next morning removal of tunnel forms start. In the meantime installations of wire mesh and rebar for the walls of next phase proceed. Connections of half tunnels and bolts of box-outs are removed. Half-tunnels are moved out on the wheels. Forms are cleaned, surface lubricated and half tunnels are located to next phase by tower crane using lifting triangle. After removal of each half tunnel, slab is supported by using telescopic props.

	Stripping & end-wall platforms are assembled and placed. Wall reinforcements are installed.
	In order to cast second floor, first half tunnel is placed after assembling of platforms.
	Second half tunnel is located as per layout.

	Reinforcement, box-outs, conduits are put in place.
	Working platform is installed. Tunnel for is made ready for casting.
	Casting of second phase is completed.