General Prefab

precast segments, beams and decks

Segmental ft and launching gantries

Construction Methods of precast decks

In general terms the precast deck construction methods are divided in three groups:

Dividing the deck longitudinally, resulting in the assembly of T or U shaped beams whith a lenght corresponding to the span to be built.

Dividing the deck transverssally in segments. Full span deck corresponding to the total width and total lenght

of one deck span excluding any longitudinall or transversal division.

AUGUST / 2014

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!SCAFFOLDING SYSTEMS & LAUNCHING GANTRIES FOR CONCRETE BRIDGES-BRIDGE ENGINEERING CONSULTANTS

Table of Contents

Transport and assembling segment system: !! Underslung Launching Gantry..3 ! Overhead Launching Gantry.6 ! Combo Launching Gantry....8 ! Segmental Form Traveller10 !!!!!

Full Span transport and assembling System: !! Full Span Launching Method.12 !!!!!

Precast beams transport and assembling System: !! Beam Launchers.17

! 2SCAFFOLDING SYSTEMS & LAUNCHING GANTRIES FOR CONCRETE BRIDGES-BRIDGE ENGINEERING CONSULTANTS !!

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Underslung launching gantry

The Underslung Launching Gauntry LG is a high efficiency equipment specially designed to install precast concete segments in the box section deck and typically spans in the order of 30 to 35m. !!!!

When the span activities are repetitive the achieved performance using these Launching Gantries allow in a week to install all the segments

corresponding to 2 spans and in some cases even 2,5 spans. !!!!Each span built using the precast segments has a lenght corresponding

to the distance in between the center to center of columns.

How the segments are supported?

All the segments are supported by the Launching Gantry until

the prestressing is applied keepoing all segments together. !The segments are supported by

hydraulic ajustable supports equiped with teflon pads.


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A- Electromechanicall equipmentB- Main Girder C- Noses D- Supports E- Supporting bracketsF- Beams G- Gantry Crane H- Lifting hook

Main components:A simple solution!

The Underslung Launching Gantry is a simple solution to support the precast concrete segments, being made by two almost symmetrical

halves.Each half includes a main girder and two noses, supported at three

supporting brackets pairs connected to the columns. On the top of the two main girders travels a gantry crane that perform the segments assembling. On the main girder inner web outer surface there are several support beams where the precast segments are supported

awaiting to be adjusted and prestressed.

! 4SCAFFOLDING SYSTEMS & LAUNCHING GANTRIES FOR CONCRETE BRIDGES-BRIDGE ENGINEERING CONSULTANTS !

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Some of the inovations introduced by STRUKTURAS:

!Independent main structure, connected only by the gantry crane, allowing to do transversal adjustments from a single track to double or even triple. !!!Implement hinge connections on the Underslung Launching Gantry making it possible to be used at decks with horizontal radius as small as 75m. !!!The hydraulic underslung support system where segments are supported allows correction of any misaligments resulting from lifting phase.

The STRUKTURAS Launching Gantries exceeds conventional design limitations in modern

bridge construction! Both Underslung and Overhead

Launching Gantry solutions consists of two main structures combined with advanced lifting

devices, creating an exceptionally flexible system for both methods of construction

from span to span or cantilevering.


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Overhead Launching Gantries !

Strukturas also supply the Overhead Launching Gantries, which generally include a overhead main structure of two trussed beams, which support the precast segment lifting winches, main supports installed on the columns, lifting yoke and also several hydraulic

systems that allow to launch and adjust the equipment !This kind of solution is especially suitable for situations where the space bellow the deck

is limited and also if there are significant variations in the deck width.


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Combo Launching Gantries

The Combo Launching Gantries allows for the assembling of precast segments both by the in fill method as the

cantilever method. !The Launching Gantries can also be supplied with full symmetry reducing the dismanting operations and new

assemblings.


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Hinged Launching Gantries

Over the past years, several contractors have chosen our Gantries for their projects. !

With horizontal curves up to 350m and span lenghts above 50m, the utilization of special

hinges on our Launching Gantries proved its successs.


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Segmental Form Traveller

The Segmental Form Traveller is an equipment designed to lift and assemble precast concrete segments at bridges and viaducts built by the cantilever method starting from the

pierhead. The segmental Form Traveller generally includes: steel

structure, working platform and ladders, anchor systems to the deck already finished, hydraulic equipment used to adjust

and level the Form Traveller itself and also the precast segment and even electric winches equiped with safety

brackes.


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REAR TRUSS

The segment lifting unit

The segment lifting unit is a subset of the Segmental Form Traveller extremely important

because this is the unit performing the lifting and adjusting the

segment.

In general terms this segment lifting unit is composed by two

electrical winches, the front beam on which these winches are installed and corresponding working platforms, eletrical

cabinets and winches steel wires.

This unit also includes two lifting winches that suspend the segment and all the hydraulic equipment

that perform the adjusting horizontal movements

(transversally and longitudinally) and also adjust the segment

longitudinal slope.

The transversal slope adjustment is made by the winches.


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Full Span Launching Method

The Full Span Launching Method equipments are used in the assembly of concrete precast decks spaning in between

25m and 35m and weights up to about 1800 ton.

This construction method is especially suited for projects that require minimal deck deformations and fast construcion.

The full Span Launching method is part of a wider set of devices that operate all together and that includes in general terms the Full Span Launching equipment it self, the gantry

crane/straddle carrier and the special multiwheeled transporters.

Depending on the distance between the prefabrication yard and the Full Span Launching equipment is possible to install 3 spans a day, however being possible to assemble 1 span at

every 4 hours.


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Capacity: 500 - 1800 ton

Span lenght: 25m to 35m

Lifting speed when loaded: 0 - 0,5m/min

Lifting speed when unloaded: 0 - 1,0m/min

Lifting height: 7,5m

Transverse adjustment: aprox. 250mm

Launching speed: 0 - 3m/min

Main features



SDI is a point venture established in 2010 in

Zhengzhou, China between Strukturas AS

from Norway and the New Dafang from China; with the goal of providing on

the international market a complete range of

equipment for the bridge decks. !!

All equipment is designed and produced in accordance with

Strukturas quality control system.



The Gantry Cranes/Straddle Carriers !

The gantry cranes/straddle carriers equiped with steel or rubber tire

wheels are used at the precast yard to handle the precast full span decks

and load them to the special transporters. !

Main features !Capacity: 900 ton x 2

Lifting speed when loaded: 0 - 2m/min

Max. admissible slope: 2% !The specifications can be adjusted

for each project!

! 15SCAFFOLDING SYSTEMS & LAUNCHING GANTRIES FOR CONCRETE BRIDGES-BRIDGE ENGINEERING CONSULTANTS!!


Special vehicles !The special vehicles are equiped with

rubber tire wheels, with capacity to carry heavy loads over rought terrain. !The wheels can turn 90 degreed. !

Main features !Load capacity: 80 a 1800 ton

Minimum turning radius: 24m Speed when loaded: 5 Km/h

Speed when unloaded: 10 Km/h Admissible longitudinal slope: 5% Admissible transversal slope: 4%



Beam Launchers

Finding its application on one of the most commonly used construction methods for standard sized bridges, the BL

represents a cost efficient, fast and technically flexible solution. Strukturas provides the BL including the corresponding

transport trolleys on the bridge deck, to provide a comprehensive solution to our clients. !

Strukturas supply the Beam Launhcers including the corresponding precast concrete beams transport Trolleys

running on top of the deck. !The Beam Launchers allows to perform the assembly of the

concrete precast beams without the need of cranes, being specially suitable for bridges an viaducts with very high

columns, and difficult access conditions at ground level or when construction is made above water or when ground has

low bearing capacity. !Over 160 units supplied with capacities ranging between 30m

and 55m span and precast beam weights in between 60 ton and 250 ton.



CLARKSGATE 5

N - 3970 LANGESUND

NORUEGA

!ZHENGHOU CITY

HENAN PROVINCE

CHINA

[email protected]

Consulte o nosso parceiro na sua rea geogrfica:

Our services include: -tender stage quotation preparation -design, fabrication, delivery and technicall assistance to the new equipment -rebuilt design regarding existing equipments delivered by us, for use in different consitions of the original !Ask for out referenc list!

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tact

us!

Eng. Aquilino Raimundo Cel +351 932 255 374 Tel +351 243 701 460 [email protected]

General Prefab

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