Erection Scheme Research Articles

COMPARATIVE STUDY ON THE GIRDER ERECTION SCHEME FOR THE CHIBI YANGTZE RIVER HIGHWAY BRIDGE

The construction process of composite cable-stayed bridges varies, and it closely affects the finished bridge. This study takes the Chibi Yangtze River Highway Bridge, which is the world's largest-span composite cable-stayed bridge, as an example in determining the optimal scheme of girder erection during the construction of the composite cable-stayed bridge. Six girder construction schemes were proposed for comparison and analysis. On the basis of satisfying the objective principles of the finished bridge, the stress safety principle, and the economic principle, qualitative and quantitative methods were used to analyze the girder erection schemes. The refined model of the composite girder segment was established by the finite element software ABAQUS to examine the local stress of the bridge. Subsequently, the optimal scheme of girder erection was determined. Then, the key calculation results of the optimal scheme of girder erection during the construction stages and for the finished bridge were given, which proved the feasibility, safety, economy, and controllability of the proposed optimal scheme. Results show that the measured data of the girder line shapes and the cable forces of the finished bridge agree well with the theoretical values. This agreement verifies the correctness of the determination and demonstration of the proposed optimal scheme. This study provides a certain reference for the determination of the girder erection scheme of composite cable-stayed bridges. Keywords: Composite girder; cable-stayed bridge; steel girder erection; single segment one cycle; two segments one cycle; construction process;

Analysis of Stiffening Girder Erection Scheme of Single Tower and Single Span Asymmetric Suspension Bridge

The paper analyzes four different stiffening girder erection schemes of a single tower and single span asymmetric suspension bridge with the main span of 766m by using parameter analysis combined with finite element numerical simulation. Firstly, this paper proposes two methods to study the reasonable erection time of ground anchor suspender cables, and based on the Midas/Civil finite element software, the erection time of ground anchor suspender cables with four schemes is determined by using backward-calculation analysis method. Then the main cable deformation, cable saddle displacement, horizontal inclination of main cable, internal force of suspender cables and dynamic performance of different schemes are compared. The results show that for Scheme 3 adopted in the project, the deformation of main cable is the smallest, the change of the cable saddle displacement is more slowly, the horizontal inclination of the main cable is smaller, and the bending stiffness is larger. However, the torsional stiffness is small and the flutter stability is not as good as other schemes.

High breeding performance of European Rollers Coracias garrulus in heterogeneous farmland habitat in southern Hungary

Capsule Rollers showed slightly higher breeding performance in farmland mosaics than in natural grasslands in southern Hungary, where both habitats were supplied with nest-boxes.Aim To establish which factors affect Rollers’ breeding success in agricultural and their more traditional grassland habitats.Methods Rollers’ reproductive success in farmland mosaics and grassland habitats were compared. Laying date, clutch size, feeding rate, as well as prey abundance and diversity, as estimated by sweep netting and pitfall trapping, were evaluated. Their effects on breeding performance were analysed by generalized linear models.Results In the agricultural habitat Rollers showed an even higher reproductive output than in their traditional habitat of natural grassland. Prey composition showed differences between the two habitats, with the lower abundance of orthopterans in farmland mosaics being substituted by the higher abundance of coleopterans and the diversity of arthropods (Orthoptera, Coleoptera, Heteroptera, Arachnida, Hymenoptera, Lepidoptera, Diptera, Homoptera, Mantidae, Myrmeleonidae and Odonata).Conclusion Rollers can reproduce well where good quality resources are available, even outside of their typical habitat, where nest-box erection schemes may benefit this threatened species.

Analysis of Effect of Fetching Girder from Trestle of Long-Span Steel Truss Bridge under Cantilever Erection

A large span steel truss bridge, it assembles "high, big, difficult, new, deep, steep, dangerous, heavy", etc., "eight" features in a body. In order to reduce the number of transportation ships and make the erection convenient, this paper studies a set of revolving beam erection scheme to improve the utilization efficiency of trestle. Through calculation, it is found that fetching girder directly from trestle is feasible. cantilever erection of the girder , The main truss linearis of the steel truss girder upstream and downstream has slightly deviation with the operating angle change of the cantilever crane and it need to stop lifting when monitoring and measuring, and the mast should be placed along the bridge direction.

Installation and control technology of the Haihe movable bridge, China

The Tianjin Haihe movable bridge in China has the largest span among similar bridges in Asia. Owing to the dual characteristics of being both a bridge and heavy machinery with mechanical, hydraulic, electric and intelligent control devices, the construction of its steel box girder requires appropriate installation and control technology. Because of the stringent on-site navigation restrictions and blockage conditions, as well as mechanical characteristics during construction, a semi-supported cantilever installation and erection scheme is proposed, in which a bridge-erecting machine, temporary steel pipe support, bridge cantilever construction and other traditional methods are used in combination. Unlike traditional bridge closure technologies, new alignment closure and central locking closure control technologies are employed. The latter requires that the locking device be precisely assembled and adjusted to be horizontal for the suitable operation of the central locking equipment. The execution of this construction practice shows that the technology is feasible and effective.

Construction of Qiansimen Birdge - Partial Cable-Stayed Bridge with Steel Truss Girder

Qiansimen Bridge is a partial cable-stayed bridge with steel truss girder under building in Chongqing city, China, which will carry 4 vehicle lanes and 2 urban rails. Several general erection schemes of the steel truss are proposed and compared. Based on this, the erection scheme of steel truss at the non-cable area near the tower, the side span area and of the standard segment are discussed, which could be referred by for similar engineering.

Gateshead Millennium Bridge, UK: fabrication, assembly and erection

On 20 November 2000 the Gateshead Millennium Bridge was lifted into place, in one, over the UK’s River Tyne. The spectacular nature of the bridge design—the world’s first vertically rotating bridge—and the audacity of the erection scheme attracted large crowds and significant publicity. The bridge currently takes its place as part of the regeneration of the Gateshead Quayside. This paper describes the fabrication and erection of the bridge structure by Watson Steel.

Wisconsin’s Use of Full-Depth Precast Concrete Deck Panels Keeps Interstate 90 Open to Traffic

The Wisconsin Department of Transportation (WisDOT) is facing future demands for highway bridge deck replacements on heavily used portions of its interstate highway system, particularly in the Milwaukee area. Typical bridge rehabilitation projects cause safety concerns and disruptions to traffic, and bridge closures have an adverse impact on the regional economy. WisDOT is focusing on prefabricated bridge systems for its highway bridge rehabilitation projects. The University of Wisconsin-Madison worked with WisDOT and Alfred Benesch & Co. to develop and design a prefabricated, full-depth concrete deck system for a major highway where minimal disruption to traffic flow is a requirement. In this article, the authors describe the research proposals, teamwork, design challenges, and construction of an innovative bridge redecking and widening project on westbound Interstate 90 over Door Creek in Wisconsin. The unique advantages of this hybrid prestressed, post-tensioned deck panel system are the result of an innovative design that essentially ties all the precast concrete deck panels together to minimize cracking, uses a novel longitudinal joint and unique strand coupling across the joint, and minimizes traffic disruption in a rapid erection scheme.

All-Precast Concrete Design Delivers On-Time Opening for Florida’s LECOM Medical Students

Located near the Tampa Bay area in southwestern Florida, the Lake Erie College of Osteopathic Medicine (LECOM) at Bradenton is a new 109,000 ft 2 (10,130 m2), innovative, problem-based learning facility for 600 medical students. Built at a price of 25 million, the all-precast concrete, three-story structure was delivered in a very compressed schedule, with medical students arriving for classes in September 2004, only 14 months from the onset of design. Planning and building LECOM from the outside in toward the center, a rapid delivery team made maximum use of economies of precast concrete prefabrication, production, and erection schemes. This precast concrete solution proved superior to cast-in-place concrete and structural steel alternatives in aesthetic appeal, total project cost, structural durability, and particularly in its remarkably rapid completion. With white-aggregate concrete encompassing a blue central skylight, this impressive medical education center offers state-of-the-art wireless classrooms and forensic laboratories in a striking facility that is both architecturally beautiful and thoroughly modern.

Construction of a Horizontally Curved Steel I-Girder Bridge. Part I: Erection Sequence

In the case of horizontally curved steel I-girder bridges, girder and cross-frame members are frequently detailed for erection in the no-load condition as a matter of convention. As a result, it is imperative that the erection sequence used to construct such bridges be comprehensively studied to ensure that the no-load condition can be achieved in the field and that significant superstructure component fit-up problems do not occur. The current research investigates the erection of a recently constructed horizontally curved steel I-girder bridge, in which significant difficulties were encountered during erection. The bridge erection is recreated through an analytical simulation using a detailed nonlinear finite element model. The analytical results demonstrate that a condition that closely resembles the no-load condition can be achieved in the field during construction with the proper implementation of temporary support structures; and that the difficulties encountered during the erection of the subject bridge superstructure could not be attributed to the erection scheme followed.

Gateshead Millennium Bridge, UK: fabrication, assembly and erection

On 20 November 2000 the Gateshead Millennium Bridge was lifted into place, in one, over the UK's River Tyne. The spectacular nature of the bridge design—the world's first vertically rotating bridge—and the audacity of the erection scheme attracted large crowds and significant publicity. The bridge currently takes its place as part of the regeneration of the Gateshead Quayside. This paper describes the fabrication and erection of the bridge structure by Watson Steel.

Gateshead Millennium Bridge, UK: fabrication, assembly and erection

On 20 November 2000 the Gateshead Millennium Bridge was lifted into place, in one, over the UK's River Tyne. The spectacular nature of the bridge design—the world's first vertically rotating bridge—and the audacity of the erection scheme attracted large crowds and significant publicity. The bridge currently takes its place as part of the regeneration of the Gateshead Quayside. This paper describes the fabrication and erection of the bridge structure by Watson Steel.

Designing Steel for Ease of Construction

This paper has been illustrated by four case histories of steel bridges.In two cases the designer considered the erection scheme in detail. In both cases the contractor improved on the designer’s s...

Construction Effects on Bracing on Curved I‐Girders

The placement of the concrete deck and the attachment of adjacent girders and diaphragms is generally not considered in the design of horizontally curved bridges unless the entire bare steel structure has been completely constructed and is an integral unit. The supporting of the individual girders prior to attachment of diaphragms is an important control within the construction phase in that shoring may be necessary for stability. Contained herein are general guidelines, that apply to various popular erection schemes, to prevent overstress during construction. The guidelines are determined via a parametric study that quantifies the effect that the top and bottom lateral bracing has upon the stress levels within the main girder elements. The study examines the response of a single‐span, twogirder, curved I‐girder system subjected to its own self‐weight. Multigirder bridges are also examined to determine the effect that the placement of a concrete deck slab has upon the response of the curved girder with th...

CONSTRUCTION OF THE NAVIGATION SPANS OF THE RIO NITEROI BRIDGE, BRAZIL.

Keywords HOWARD NEEDLES TAMEN & BERGENDOFF REDPATH DORMAN LONG, CLEVELAND BRIDGE AND ENGINEERING, MONTREAL ENGENHARIA CONSTRUCTION, SPANS, FABRICATION, LARGE, GIRDERS, CONCRETE, ORTHOTROPIC, WELDED, SECTIONS, RING, JACKING, CAPACITY, STEELWORK, WORKS, THREE SPAN, CONTINUOUS, MANAGEMENT, FINISHING, BRIDGES, COUNTRIES, ERECTION, STEEL, CENTRE, LANES, DECKS, SITES, SIDES, PIERS, EQUIPMENT, TENSION, WELDING, DESIGN, RELIEF, PRECAST, PLANNING, MAIN, NAVIGATION, DEVELOPING, ASSEMBLY, BOX, TWIN, TRAFFIC, SURFACING, FLOATING, TEMPORARY, BASES, JACKING UP, MEMBERS, LIFTING, PERMANENT, STRESS, PRESTRESSED, CONTRACTS, PONTOONS RIO NITEROI, NITEROI, RIO DE JANEIRO, GUANABARA BAY BRAZIL, SOUTH AMERICA... Show All

Developing an erection scheme for a large bridge

In the erection of large bridges the structure is successively analysed at each critical stage in the sequence. Invariably such structures are erected by first building the primary structural members, either by cantilevering them forward or lifting them into position, and following this by adding such secondary members as cantilevers, cross members and concrete slabs. The effect of these secondary members is to change the structural characteristics of the bridge and consequently the analysis must be able to take account of this history throughout the sequence. The LEAP suite of programs has been used on several major bridges to analyse and develop viable erection schemes and, using FRIDAY, to assess the critical stages and identify the most highly stressed members. This paper describes in a general way the methods used, and shows examples of the procedure for the particular case of the large cable-stayed West Gate Bridge in Australia.

Chesapeake Bay Bridge

When the Chesapeake Bay Bridge in Maryland was opened to traffic on July 30, 1952, it became an important link in the highway system of the United States. The fabrication and construction problems that were encountered in this project are outlined herein. Because of the unusually high elevation of some of the trusses and the great depth of water, the contractor had to adopt a unique erection scheme. This scheme combined a floating derrick, an erection dock with adjustable falsework, and controlled barges.