Specification 1041 i erection of precast prestressed concrete. The process is characterized by a movement of the launching girder to the next concreting section while the previously concreted and prestressed superstructure. 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. Botany botany the structure composed of tissue providing mechanical support for a stem. In the highway or high speed railway bridge projects, launching gantry can be used to install precast girders with full span method or segment by segment method. Finite element analysis software used to calculate safe bearing loads of all parts. The honeycomb girder launching gantry was created in 1999 by zzhz, and has proven suitable to a lifting range of 5300 tonnes. 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. Special and unique honeycomb girder, high stiffness, low deflection and high wind resistance. A method is described for the sectional erection of a superstructure of prestressed concrete for a bridge with a launching girder carrying the formwork for the superstructure and being movable from one concreting section to the other.
Us4692955a method for erecting a bridge superstructure of. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. The natashquan river bridge now links kegaska residents to the quebec highway system. Mockup bridge girder instructions november 1, 2012 page 3 of 3 full penetration weld ut nde bottom flange to web perform the full length of the weld with exception of a section 8 to 12 from the right end of the girder prior to the onsite audit. It is patent product made by zzhz for highway bridge project. Spanbyspan erection with selflaunching gantries is the most common construction method for precast segmental bridges.
Specification 1041 i erection of precast prestressed. Department, sri vasavi institute of engineering and technology, andhra pradesh. 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. Pdf precast segmental box girder bridge manual serhat. Design guidelines for steel trapezoidal box girder systems 6. Girder definition of girder by the free dictionary. The main girder of a honeycomb girder is fabricated from welded plates in isosceles triangle section.
Type i full span launching 820ton box girder chiang spark. For bridge decks greater than 250m in length, the method of incremental launching can be considered. Zzhz is a professional manufacturer and supplier of different launching gantries from china. The manual of best practice highlights a few recommended planning, design, and construction. Launching bridges is an efficient and fast way of constructing viaducts. The balanced cantilever method, with the selflaunching gantry was. From the first applications with huge self launching trusses made of lowgrade steels and hundreds of laborintensive slipcritical field splices, the single girder overhead gantries have evolved into light and compact machines that are easier to operate and provide. Founded in 1992,zzhz has designed and supplied launching gantry more than 20 years. Bridge erection machines encyclopedia of life support. But it had never before been employed for the launching of a long span igirder bridge made up of nearly 10. The equipment is completed with a couple of hoisting winches trolleys which run on the main girder itself. Launching girder manufacturers suppliers of launching. Extreme loading of wharf crane girders erik soderberg1, michael jordan2, patrick mccarthy3, and anna dix4. Imia short paper provided by michael spencer, zurich.
The grabcad library offers millions of free cad designs, cad files, and 3d models. Girder is a free and open source webbased data management platform developed by kitware as part of the resonant data and analytics ecosystem. Analysis and design of prestressed box girder bridge by. Type i full span launching 820ton box girder youtube. The method involves setting up a casting yard, forming each span in segments, and launching each successive span over piers creating a continuous structure. The incremental launching technique has been successfully applied for years for erection of more torsionally stable concrete box structures in europe. Analysis and design of prestressed box girder bridge by irc. Rollers are placed on bank and on the bed blocks for shifting. Incrementally launched viaducts of the northern marmara. Spanbyspan erection with self launching gantries is the most common construction method for precast segmental bridges. Heavy selflaunching gantries are used for macrosegmental construction of 90120m spans. Girder made by promixis, girder is the award winning home and industrial automation software that allows users of all skill level to make advanced scripts and macros to automate many functions both on the computer and around the house or office. A launching girder move s forward on the bridge piers, spanbyspan to all ow placing of the cast in situ concrete.
Regular hexagonal honeycomb holes are cut in the inclined web plate for air currents to pass through. Honeycomb girder launching gantry is specially designed for general highway and railway bridge construction. Lifting frames lf and launching girders lg are developed and used for placing. This methodology may be safer, faster, and more cost effective than other traditional erection procedures since. Elremaily construction technology laboratories, inc 5400 old orchard road, skokie, il 60077 in association with. The weld pass terminations will be cascaded to illustrate the weld pass sequencing. After proper position of launching girder, remove the rollers and ensure firm sitting of launching girder on the bed blocks. Lessons biography summary learned in the launching of steel. Now the launching girder is ready for launching of psc girder. The bridge consists of a continuous boxgirder structure with nine spans. Documentation of the girder platform can be found at for questions, comments, or to get in touch with the maintainers, head to our discourse forum, or use our gitter. Hzq50150 honeycomb girder launching gantry is a precast girder erection equipment for general highway bridge construction projects. Jun 04, 2014 the natashquan river bridge now links kegaska residents to the quebec highway system.
A launching gantry for spanbyspan erection of precast. This application is a continuation of prior application ser. Scribd is the worlds largest social reading and publishing site. It also has been used for a smaller steel box girder railroad bridge in the united states. Mar 07, 2018 download girder the leading windows automation utility that allows you to remote control your computer using wireless or infrared based remote controls. Oct 26, 2012 rollers are placed on bank and on the bed blocks for shifting. Pdf launching techniques method will never become the most economical procedure for constructing all bridges. It is used to install precast box girders in highway and highspeed rail bridge construction projects. Their main application has been in europe, but the method has now spread around the world and the technology has been applied to steel igirder and box girder bridges as well. Pictures of launching girder launching gantry machines, heayy lifting, bridge and highway construction. For a particular girder span and bridge width, a large number of parameters control the design of the bridge such as girder spacing, cross sectional dimensions of girder, deck slab thickness, number of strands per tendon, number of tendons, deck slab reinforcement, configuration of tendons, anchorage system, prestress. Irs specification for fabrication and erection of steel girder bridges and. Launching of steel girder bridges is a construction method that is implemented when the terrain conditions allow the assembling of the structure behind one of the abutments. Longspan decked precast, prestressed concrete girder bridges final report prepared for national cooperative highway research program transportation research board national research council r.
Design guidelines for steel trapezoidal box girder systems. Honeycomb girder launching gantry launching gantry. Bridge launching comprehensively describes the design and construction of prestressed concrete, steel, composite, and prestressed composite bridges built by incremental launching. With this method of construction the bridge deck is built in sections by pushing the structure outwards from an abutments towards the pier. Main girder is also supplied with a front and rear leg. Crane collapse during offloading equally remarkable to this accident, shown in. Download girder the leading windows automation utility that allows you to remote control your computer using wireless or infrared based remote controls. Time and cost savings were a major concern in the execution of this project and it was partially for this reason that the launched girder erection technique was chosen. Selflaunching erection machines for precast concrete bridges pci. Offering explanations of both the theoretical and the technological aspects of the construction process, bridge launching illustrates worldwide case studies with.
Their main application has been in europe, but the method has now spread around the world and the technology has been applied to steel i girder and box girder bridges as well. The equipment is completed with a couple of hoisting winch trolleys which are assembled onto trolleys so to move along the main. Building a large beam, esp one made of steel, used in the construction of bridges, buildings, etc 2. This technique is used for posttensioned deck bridges as well as steel girder bridges. 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.
From the first applications with huge selflaunching trusses made of lowgrade steels and hundreds of laborintensive slipcritical field splices, the singlegirder overhead gantries have evolved into light and compact machines that are easier to operate and provide. Launching girder mechanical engineering free 30day trial. Incremental launching method of bridge construction. After midspan closure and launching to the next pier, the casting cells are set close to each other to cast the new double pier. Bridge girder launcher via span and launching side girder. A beam, as of steel, wood, or reinforced concrete, used as a main horizontal support in a building or bridge. This methodology may be safer, faster, and more cost effective than other traditional erection procedures since most of the operations. But it had never before been employed for the launching of a long span i girder bridge made up of nearly 10. Us4692955a method for erecting a bridge superstructure. Download honeycomb girder launching gantry for free. The precast fabricator will load the girders onto the contractors hauling equipment. 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. May i know in which software you are developing launching girder detail drawings.
Some of the more commonly occurring extreme crane loads on crane girders are presented below. Panjiva uses over 30 international data sources to help you find qualified vendors of launching girder. Design of prestressed concrete igirder bridge superstructure. Pictures of launching girder launching gantry machines. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. Honeycomb girder launching gantry is patent product made by zzhz, mainly used for highway bridge construction with full span method. Launching equipment is made of a main girder, supported on the deck by means of a series of cross railbeams supplied with sliding rollers. 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. Guidelines on safe use of lifting frames and launching girders for. Displaying launching girders powerpoint presentations seminar on segmental construction of bridges ppt presentation summary. The invention refers to a method for the segmental erection of a bridge superstructure of prestressed concrete by means of a launching girder carrying the formwork being movable from one concrete segment to the other.
Jul 05, 2016 launching side girder at one time,jqg200t50m. Pdf construction of precast segmental box girder bridge. Launching girder free download as powerpoint presentation. Join 7,330,000 engineers with over 4,190,000 free cad files join the. The power pack machine and mono pulley jack is used, at the time of launching. 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. The balanced cantilever method, with the self launching gantry was.
The same parallel precast posttensioned box girder structures were used with main spans of 60. Launching for tiand box type girder,more than 10 piecesday,including via to next span. Designs of bridges depending on the function of the bridge, length of the bridge, span of the bridge, the nature of the terrain, and the material used to make. Join the grabcad community today to gain access and download. The method both underslung and overhead is highly adaptable. Newgeneration bridge erection machines are complex and delicate structures. Nrs also designed and supplied the largest launching gantry in the world for the.
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