Behavior of the splice regions of spliced igirder bridges. Incremental launch sombrio bridge bridge erection conventional. Long span girders in heavy crane runways shows the effect of cross diaphragms on a girder system expansion systems of runway with alternate bracing location. Girders often have an ibeam cross section composed of two loadbearing flanges separated by a stabilizing web, but may also have a box shape, z shape, or other forms. Effects of blast loading on prestressed girder bridges article pdf available in shock and vibration 191. These girders vary in depth from 42 up to 74 and can be used for spans between 40 and 160. Structalbridges began delivering box girders in the scope of the north channel bridge replacement project in cornwall, ontario, in midmay.
The launching nose reduces the dead load of the cantilever span and utilizes its tapered profile to. A launching gantry for precast concrete girders is a light modular structure comprising two parallel trusses with triangular cross sections. Posttensioned nu girders are produced using the same side forms as pretensioned nu girders 160 mm web but with a 175 mm thick web to accommodate the posttensioning ducts. The gantry girder is subjected to fatigue effects due to moving loads. A box girder bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. The use of a launching gantry often solves erection difficulties. Imia short paper provided by michael spencer, zurich insurance, london launching girders. Effect of longitudinal stiffening on bridge girder webs at. Pictures of launching girder launching gantry machines, heayy lifting, bridge and highway construction. Responsible for offloading 12 foot high steel girders from rail cars in the vertical position and rotating to the horizontal position and loading onto special trailers. Offset between girders bevels gusset plate callout wthickness, height, and length angle member dimensionscallouts wbeam callout wlength alternate welded connection detail callout fill plate callout girder no. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. Now the launching girder is ready for launching of psc girder.
Main girder is also supplied with a front and rear leg. A launching gantry described also by other terms including beam launcher, girder launcher, bridge building crane, and bridgebuilding machine, locally nicknamed the iron monster is a specialpurpose mobile gantry crane used in bridge construction. Web plumb influence on skewed igirder, steel bridges during construction article pdf available in bridge structures assessment design and construction 72. General part at the company, lshaped and upsidedown tshaped girders are manufactured and also oneslope and twoslope ishaped crosssection roof beams are produced. Main features and advantages hideshow the launching gantry is a special hoist equipment used for lifting the concrete girder on the highspeed railway construction. The center girder supports half the weight of the floor joists as indicated on the framing plan figure 3 by the shaded portion. The natashquan river bridge now links kegaska residents to the quebec highway system. Photoalbum of launching gantry and heavy lifting operating. It is used to install precast box girders in highway and highspeed rail bridge construction projects. A limited number of studies relevant to the performance of spliced, internally prestressed precast girders have been identified. After proper position of launching girder, remove the rollers and ensure firm sitting of launching girder on the bed blocks.
But it had never before been employed for the launching of a long span igirder bridge made up of nearly 10. Evaluation of the structural performance of tetragonal lattice girders article pdf available in international journal of steel structures 1 june 2012 with 2,255 reads how we measure reads. Rollers are placed on bank and on the bed blocks for shifting. Beam, in engineering, originally a solid piece of timber, as a beam of a house, a plow, a loom, or a balance. This short paper, with its appendix, is primarily intended to provide risk engineers with a simple reference tool to promote enquiries into the training. Guidelines for design and construction of decked precast, prestressed concrete girder bridges final report prepared for national cooperative highway research program transportation research board national research council r. Heavy self launching gantries are used for macrosegmental construction of 90120m spans.
A wide variety of launching girder options are available to you, there are 1,976 suppliers who sells launching girder on, mainly located in asia. Introduction india has witnessed a large growth in the field of construction, with construction sector comprising 40% to 50% of indias capital expenditure on the projects in various sectors. Analysis and design of prestressed box girder bridge by irc. A girder bridge is a bridge that uses girders as the means of supporting its deck. This paper introduces a new framework to compute live. Installation of girders and beams uab betonika, lt52367 kaunas, naglio 4a. For heavyduty cranes, the gantry girders are to be checked for fatigue loads see is 1024 and is 807. It also has been used for a smaller steel box girder railroad bridge in the united states. The research findings of such studies related to the behavior of the splice regionsjoints are described within this section. Civil engineering bridge erection machines marco rosignoli encyclopedia of life support systems eolss launching gantries reach 100120m spans and lifting frames cover longer spans and curved bridges. Plate girders ii where, qe elastic critical shear strength values to be used in design for different values of ad and dt are tabulated in table 1. Launching systems for segmental bridges vinay gupta, principal consultant, tandon consultants pvt.
Elastomeric bearings for steel trapezoidal box girder bridges. Specification 1041 i erection of precast prestressed. Home launching gantry launching girder, bridge and. Tooma a project report submitted to the school of graduate studies in partial fulfilment of the requirements for the degree. Launching gantry for highspeed railway launching gantry. The term girder is often used interchangeably with beam in reference to bridge design.
Traditionally, bridge bearings supporting steel trapezoidal box girder a. Bridge is composite concrete structure which is composed of slab panel, longitudinal girder and cross girder. Background it is estimated that over 1,000 bridges worldwide have been constructed by the incremental launching method gohler 2000, the vast majority of which have been posttensioned concrete box girder bridges. Welded plate girder checklist wyoming department of. Department, sri vasavi institute of engineering and technology, andhra pradesh. It is not uncommon to see a single 150foot 45m precast concrete girder being shipped today, while only 120 feet 35 m was the norm in the past figure 14. Design the bridges are designed for csa s600, cl 800 loading. Follow all instructions and warnings in building this bridge. Precambering of precast girders allows for vertical clearance below, the casting cycle of concrete girders is much shorter, and steel girder fabrication is mostly automated. From hong kong to china here with vsl construction hong kong on the shenzhen western corridor we build the deep bay highway link and the shenzhen western corridor bridge. In building construction, a beam is a horizontal member spanning an opening and carrying a load that may be a brick or stone wall above the opening, in which case the beam is often called. View the properties and specifications of a girder group or of an individual girder in the group. While these girders are good and efficient they have fallen out of favor for new construction as the more efficient and. Comparative study of tbeam bridge longitudinal girder.
With full span installation method, the launching gantry can lift and install one concrete girder in a single span every one time. The steel beams could not be shipped vertically due to their height once loaded onto trailers, the beams. Imia short paper provided by michael spencer, zurich. All four girder lines were launched simultaneously with temporary roller supports provided for each girder line at two locations within the launch bed and at the north abutment and pier. For the bow river bridge, full height 2800 mm deep side forms were installed in the plant to cast the girders. This short paper, with its appendix, is primarily intended to provide risk engineers with a simple reference tool to promote enquiries into the training, operational practices, safety and equipment associated with the use of launching girders lgs for viaduct and bridge. As launching girder can handle castin place concrete, as well as prefabricated elements, it is highly adaptable for a wide range of spans and types of superstructure. Design example 36 b s d i dead loads continued component dead load dc 2 dc 2 component dead load acting on the composite section barriers 0. Use of precast igirders for accelerated bridge construction in high seismic regions sri sritharan1 justin vander werff2 rick snyder3 abstract this paper summarizes the experimental investigation of an integral bridge pier system consisting of a. Zapatamedina abstract patch loading is a predominant load case at incremental bridge launching. Method to compute liveload distribution in bridge girders jingjuan li, ph. The contractor can construct a tapered launching nose on the leading end of the girders.
Time and cost savings were a major concern in the execution of this project and it was partially for this reason that the launchedgirder erection technique was chosen. The method both underslung and overhead is highly adaptable. A launching girder move s forward on the bridge piers, spanbyspan to all ow placing of the cast in situ concrete. The equipment is completed with a couple of hoisting winch trolleys which are assembled onto trolleys so to move along the main. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. Large number of design variables and constraints are considered for cost optimization of the bridge system. Physics is a cumulative subject, so make it sure you understand basic concepts and typical problem solving techniques in previous chapters before moving on to a new chapter. It is the main horizontal support of a structure which supports smaller beams. A global optimization algorithm named evop evolutionary operation ghani 1989 is used which is capable of locating directly with high. Handling and shipping of prestressed concrete girders. The wsdot w series girders are basic i girders and have been used longer than any other i girder in washington state. Launching gantry and bridge highway construction pictures. Liveload distribution is an important step in the analysis of bridge superstructures.
The box is typically rectangular or trapezoidal in crosssection. Normally, lightand mediumduty cranes are not checked for fatigue effects if the number of cycles of load is less than 5 x 106. The incremental launching technique has been successfully applied for years for erection of more torsionally stable concrete box structures in europe. This design memorandum specifies required design criteria for temporary condition service limit state checks associated with handling and shipping of prestressed girders. I operated and supervised one of the largest launching gantries in the world. Launching girder,steel launching girders,launching girder. The power pack machine and mono pulley jack is used, at the time of launching.
Comparative study of tbeam bridge longitudinal girder design using irc 112. Pdf effects of blast loading on prestressed girder bridges. If the total floor is 24 feet wide and the girder is placed midway between north and south perimeters of the building, the girder will be supporting half of each of the 12 foot spans, that is, a total of 12 feet of width. Figure 11 shows the girders in their cantilevered state during the launch. Selflaunching erection machines for precast concrete bridges. Launching equipment is composed of a main girder, single or twin, supported on the deck by means of a series of cross railbeams supplied with sliding rollers.
Case studies for biography steel bridge several different. Shifting of launching girder from one span to other span is known as auto launching for launching the launching girder various mechanicalhydraulic jacks, power section and other things are used. Recordbreaking precast nu girders installed in alberta. However, some authors define beam bridges slightly differently from girder bridges. Analysis and design of prestressed box girder bridge by. Elremaily construction technology laboratories, inc. Bridge erection machines encyclopedia of life support. The erection of the girders, which was also entrusted to structalbridges, is being executed using the launchedgirder erection technique that requires the use of a steel launching nose. The two most common types of modern steel girder bridge are plate and box.
179 181 1246 98 62 1223 1334 130 1083 578 454 804 365 1027 1372 103 16 860 1256 813 1426 183 1453 1162 400 869 294 504 1353