The Nichupte launching beam is a special piece of equipment designed for the assembly of the new “Nichupte Bridge” viaduct located in Cancun, Mexico. The purpose of the structure is to allow the construction of the foundations, the piers and the installation of the deck, composed of prefabricated concrete beams, without carrying out any construction site installation in the entire area of intervention of the equipment.

The machine is operational for the part of the viaduct between pier 40 and pier 60 (20 spans of approximately 35m), an area which, due to the presence of the lagoon below, does not provide for the possibility of construction site installations for environmental reasons.
The launching beam is made up of two single-cell caissons of 96m in length. The boxes have an almost constant height of 3.22 m; only the first rear ashlar has a height of 2.82 m. There are ribbed slabs along the entire length both longitudinally and transversely. The diaphragms are placed with a constant pitch of approximately 3.8m.

The main beams are connected transversely by n. 3 box-shaped crosspieces, one at the rear, one at two thirds of the span and one at the front.
The machine has a cable-staying system made up of 4 stays anchored at the top of the end crosspieces and at the top of the pylon located in correspondence with the central crosspiece.

The structure is completed by the two platforms, a rear one which houses the generators and guarantees access to the entire rear part (main access to the machine and inspection of the containers), and a front one where all the construction site activities are carried out. The various work levels are connected to each other via external walkways and stairs.
The overall size outside the wagon is 101×25.7×17.4m

The OA14 railway bridge on the Luxembourg-Bettembourg line is a suppressed-span arch railway bridge with a span of approximately 200m. The arch is of the reticular type with connecting crosspieces between the lower flanges. For the realization in a protected environment of the welding and the painting of the lower and upper arches, the diagonals and the crosspieces, the construction of welding cabins to be moved in each section of joint has been considered.
The cabins have an inverted U-shaped cross-section with a double-pitched roof and a reticular structure made of box-shaped sections.

The cabins are positioned on an adjustable frame structure attached by clamps and pins to the upper wing of the arch. The huts are connected to the viaduct by means of adjustable supports made with telescopic tubes that allow correct positioning on each working section. In a first phase, where only the lower arch and the diagonals resting on temporary piles remain, the joints of the lower arch and the crosspieces will be made. In a second phase, the upper arch will be installed and the joints of the upper arch and those between the diagonals and the upper arch will be completed; moreover.

The platforms are adjustable in height to adapt to the two working configurations on the lower and upper arch. Access to the shed is provided from below by means of a basket; access to the bow is authorized by adjustable telescopic platforms.
On all sides of the cabin there is a ribbed sheet covering with the function of protection against falls and atmospheric agents; only in the front part, occupied by the arch, a tendon closure will be performed.

Metal structures for the prefabrication of prestressed concrete segments erected by cantilever system.

Studies of the metal structures of the prefabrication tools (fixed part and mobile part) and of the trolleys for moving the segments. Studies of metal formwork.

Metal structures for the load-bearing elements of the formwork for production of precast segments for a concrete deck prestressed.

Design of the structures for the fixed part and the mobile part, retaining towers of the fixed part, trolleys to move the segments.

Design of the metal parts of the formwork for the on-site prefabrication of segments.

The tools are designed to adapt to three different types of segments:
• Segment at constant height – longitudinal length of 260 cm type S1, S2 (standard) and 280 cm type P4, P4A (with diaphragms)
• Segment with variable height longitudinal length of 260 cm typo S3, S4, S5 (standard) and longitudinal development of 280 cm type P1, P2, P3, P5 (with diaphragms)
• Joint voussoir – longitudinal length of i 195 cm type A1, A2 (with diaphragms)

The new connection between the island of Lantau in the Hong Kong archipelago and the artificial island of Check Lap Kok, on which the Hong Kong International Airport is based, is part of the development of the road infrastructure network that branches off to China to the north (Tuen Mun) and to the east (Macao), with works of impressive size that illustrate the ferment of Hong Kong and China.

Our intervention involved the safety of the assembly equipment of the prestressed reinforced concrete viaducts that connect Tuen Mun along an arm of the sea to the artificial island adjacent to the airport. The area of ​​southern China where the Hong Kong archipelago is located is in fact subject to a long season of typhoons that reach winds above 250 km / h; the equipment in question, specifically the launching car that lays the prefabricated reinforced concrete blocks, had not been appropriately sized given the condition of exposure to the effects of a typhoon and for this reason the construction management of the work had blocked its activities with consequent shutdown of the construction site.

The incremental launch of the Ihnsaniye Bridge in Turkey needed the construction of two temporary piers to allow the crossing of the span with a maximum span of 80m (typical span around 50m). The bridge has two specular and independent decks with a CAP box section approximately 21m wide.

The temporary piers are about 15 m high and consist of 4 double T columns linked together by a reticular structure. At the top, two high-inertia beams support the sliding sleds and the lifting cylinders and, in turn, rest on diagonal elements that carry the load on the columns, placed at a reduced distance between the centers with respect to the supports.

The whole system is designed to minimize the deformations under the reaction transferred from the bridge because the prestressed concrete deck is very rigid and therefore extremely sensitive to differential settlements.

Design of the metal structures constituting the movement and formwork support elements for the prefabrication of the elementary segments of a reinforced concrete deck made with the “short line” system.

Design of metal structures constituting the fixed and mobile head,fixed head support towers, segment moving wagons. Design of sheet metal formwork structures and rigging and stripping equipment.

The equipment designed was used to manufacture different types of segments:
• Viaduct M194 – Typical segment and piles – Width 9.3 m, height 2.60 m, length variable from 3.05 to 3.70 m.
• Viaduct M195 – Section and typical pile – Width 9.3m, height 2.95m, length variable from 2.8 to 3.75m.

Metal structures for the load-bearing elements of the formwork for the production of precast segments for a prestressed concrete deck with spans of 21 and 26 m.

Design of the metal structures of the prefabrication tools (fixed part and mobile part), of the trolleys for the movement of the segments. Steel formwork design.

The tools are designed to adapt to two different types of segments:
• Typical segment
• Segment on pier

The Danube Bridge at Braila is a suspension bridge with a total length of 1974.30m with 3 spans including a central span of 1120m.

The deck has a typical width of about 40m but varies moving longitudinally and consists of a box made of an external orthotropic plate stiffened by trussed diaphragms.

The design included the structural analysis of the segments of the bridge box (dimensions approximately 30x40m) during the storage and assembly phase and the design of the supports, their layout and the necessary reinforcements.

The temporary metal connections of the diaphragm of the mast to the mast itself were also studied. Its section consist of a reinforced concrete box of 6.75x3m with a wall 60cm-thick and a length of approximately 20m.