The set lanzavigas is an instrument designed for the assembly of precast beams for bridges and viaducts. In short it is a bridge crane with lattice modular beams composed of rectangular elements. These can be connected to form two beams of 120 m in length. It has two lift trucks of 100 tons capacity each to move the load along the two lattice beams. The difference with a conventional crane trucks shuttle is in each of their support. Unlike translation carts, which allow only longitudinal movements on the beam rail, these possible translations of the lattice girders in the direction perpendicular to the beam rail. In this way the whole lanzavigas placed on an opening bracket or has been mounted, it can be released to the next. Elements of the set lanzavigas
Formed by two beams HEB 600 braced together by a square of side rail 30 mm in the upper wings. Placed caps on the ends of beams to prevent the joint out longitudinally. A distance of 1030 mm wheelbase HEB beams, gives overall dimensions 1330 mm wide, 630 mm in height and length of 15m, 17m and 20m which are used depending on the width of the lintel of the structure to be ride.
Chains rated load 10 tons quer lane beams together fixing lugs in safety plugs and anchors on the board to the doorposts in anticipation of the possible side beams rollover lanes.
Trusses consist of rectangular sections of 1.1 m wide and 4.2 meters high and 20 m long. The modules are formed by two beams IPE 360 in the upper chord and two beams IPE 500 at its bottom chord. With twelve modules of 20 m can make two blades of 120 meters in length.
They consist of two racks with 4 grooved wheels mounted on bearings. These racks are joined together by a bolted swing so that the resulting element is a dual carriage with bearings on opposite sides and perpendicular directions. The upper rolling cart allows truss to move in its longitudinal direction, the lower bogie moves the whole in the direction of the beam rail. Clamps placed on the sides of cars rolling bearing profiles embrace lanes running in both directions preventing possible derailment.
The whole beam launcher has two lift trucks consist of a frame with two grooved treads two wheels each that can be adjusted so that treads distended 5m, 6m or 7m between themselves depending on the separation which are mounted the two lattice girders. The winch, engine, gearbox and hook mounted on each carriage resulting in a lifting system which has the following characteristics:
Capacity: 100 tons.
Lifting height: 10 m.
GANTRIES ENTRY AND CLOSURE
Metalware porch as closed-section profiles are placed at the ends of lattice girders. These unite in solidarity between the two trusses.
Conditioning step 1 (taller bracket) for the installation of all lanzavigas.
Will need to have an area of 65m long in the direction of the viaduct to ride
x 25m in width along the bracket about input beams, equipped for
stand the test of cranes and trucks that are used during assembly (axle loads of 20
tn approximately). • Download the material in the assembly area. The material is taken to set lanzavigas
Jobsite loaded onto trucks and download them using small cranes
- Personal: 1 assembly teams.
- Machinery: Auto transport.
- 50 ton crane for unloading
- The work will be the level of the platform to engage laspiezas trucks and at ground level when unhooking.
Main beams will be shifted using the engines of cars translational, throwing them into the doorway to ride until the end of the porch vertical stack than where you place the dice on two meters grading.
The lift truck closest to the entrance portico laposición will move to a closer relationship to it. In that position will engage a ballast of 20 tons to modode counterweight.
- Personal: 1 equipment assemblers
- Machinery: One of the workers of all lanzavigas manipulate the keypad from the stirrup. Another of the workers support the first indicating the positions of all from a puntosobre the lintel. Need to have access to the lintel, and prepare a lifeline Paraque could catch her by the safety harnesses.
MOUNTING ELEMENTS ON LINTEL
Using the second lift truck, will be the modules that make up the dice leveling concrete, and assembled in three turrets on the lintel. This maneuver is repeated with the beam rail and trucks travel to stop the drive system mounted on the lintel.
The next step will be to support all lanzavigas on translation carts side inthe stack. For this set focuses on the beam rail bracket and ballast discharge of 20 tons. In this way with cars as a swing pivot on these and all cars will be supported on the bracket and battery.
- Personal: 1 equipment assemblers
- Machinery: 80 ton crane
One of the workers of all lanzavigas manipulate the keypad from the stirrup. Other operators will support the first indicating the positions of the complex from a point on the lintel. Need to have access to the lintel, and prepare a lifeline so that they can engage in it by the safety harnesses.
Lanzavigas whole, as its name suggests, is a device designed for mounting precast beams. Here are the moves to make in assembly
- Receiving beams.
- The beams are taken to the lanzavigas on a truck. The vehicle was reversing on the porch or portico bracket.
- Once there, lift trucks located at the end of the main beam on the beams will enter, it attaches one end of the beam to hook lift truck further away from the truck.
- Maneuver starts to move the beam into the vacuum with the lift truck caught rolling on the main beams and the truck backing up until the other end of the beam is mounted at the height of lift truck hook yet is free. This anger lift truck unlocked and the translation is done by the truck tractor.
Attaching the second end of the beam to the second hook lift truck and the beam suspended from the two cars is carried on until the opening of an aperture in which is to be mounted. When attaching the side of the truck crashes the car 2 and the translation is done with the engine lift trucks.
The dolly is hooked onto the tractor and is removed from between the blades of lanzavigas to allow lateral movement thereof.
With an operator on the lintel and the other on the bracket / board is made lateral movements. • At this time, moving all over the beams lanzavigas lane, let the beam on the projection of the support and go down the hooks to allow the beam mounted on its supports.
Once supported and hold the hooks, struts underpin the construction beams. Staff: 2 teams of fitters. Machinery: Auto dolly beams. During these maneuvers will be two installation teams, one on the side of the entrance portico, in bracket or board formed, and the other side of the porch of closing on the lintel. The team hooked land side beams to lift trucks and check the positioning of the beam on the corresponding neoprene. One of his workers handled the lift trucks and travel on their side. On the other hand, the second computer checks the positioning of the beam on the corresponding neoprene and one of the workers handle the keypad of the cars travel on the side of the porch of closure. Operators of both teams lanzavigas manipulate the set to perform coordinated movements, will be permanently connected by radio.
The order of assembly of the beams of a span is usually the next. First are mounted on the ends. These are released to focus on the empty hole left in the same and get off the hook until they are about 5 inches from the height of the supports of the beams as an additional security measure, so that lateral movement of the whole the beam is a minimum threshold in anticipation of an accidental destabilization of the whole. At this time moving the joint rail beams take up his position at the ends of the span. Mounted the end, we continue riding the other, from the ends toward the center.
MOVEMENT BETWEEN VANOS
Mounted span beams, plates placed formwork, rebar and concrete board, move the set lanzavigas to place on the following vain. Lanzavigas whole is mounted on the compartment in which the beams have been placed and has concrete slab. On the one hand, the beam rail (beam lane 1) will be supported on the board of the opening above and on the other (beam lane 2) on concrete cubes were used to level the set lanzavigas.
In order to place the pitcher on the next set vain to mount, will have to do the following: With all lanzavigas centered on the longitudinal and transverse mounted vain, and lift trucks placed at the opposite end of the entry of beams, power translation engines longitudinal joint that moves to the step input beams. We will make this movement until the geometric center of the lattice formed by the blades set on the beam launcher rail is placed on the board. The auxiliary crane will be placed on the board, focusing on this, next to the entrance portico of the whole beam launcher. The auxiliary crane, place the counterweight 25 t between the two blades of the whole pitcher of 2m of the entrance portico. The crane auxiliary hook launcher all the entrance portico and tighten the shot to take a load of 1 t.
We will move the lift bridge beams together, from their position near the porch until they were sticking close to the entrance portico. The auxiliary lift bridge, he will be placed on the beam rail is supported on leveling the dice. With the cars in this new position, the auxiliary crane your load will be varied, from the initial ton load of 23 tons or so. 98 There will be a simultaneous move it forward longitudinal lanzavigas and drive assembly of tractels, until the most advanced set top pitcher, exceeds two meters the position of the stack / threshold of the next vain to ride. The auxiliary crane is placed on the board, focusing on this, next to the entrance portico of the whole beam launcher. The auxiliary crane, place the counterweight 25 t between the two blades set at 2m pitcher gantry crane auxiliary input hooked the whole pitcher for the entrance portico and tighten the shot entering the whole load to separate launcher trucks beam travel lane closest to the entrance portico Using the auxiliary lift bridge, the cars are removed from the beam travel across the porch rail and will end between the two blades formed on the board. The lower auxiliary crane hook, making the whole tilt pitcher to leave with an upward slope of approximately 2 º.
With the lifting bridge beams closest to the entrance portico, will engage the counterweight 25 t be tensioned hoisting ropes leaving the counterweight resting on the ground. Using the auxiliary lift bridge, the dice are placed on the lintel leveling / pillar of the following vain to ride. Using the auxiliary lift bridge, hoist the girder rail porch closest to the entrance and place them on leveling dice placed on the stack / threshold of the next vain to ride. Using the auxiliary lift bridge, the trucks are mounted on the beam rail travel placed on the grading given. Will release the counterweight of 25 tonnes down hook lift bridge closest to the entrance portico. The rise auxiliary crane hook, causing the launcher assembly tilt to left in horizontal position. Supported on translation carts side gate closing. The lifting bridge beams are placed between the two rail beams in the vicinity of the beam closest to the entrance portico. The lower auxiliary crane hook and disengage the entrance portico.