EP0685018B1 - Bridge structure - Google Patents
Bridge structure Download PDFInfo
- Publication number
- EP0685018B1 EP0685018B1 EP94907749A EP94907749A EP0685018B1 EP 0685018 B1 EP0685018 B1 EP 0685018B1 EP 94907749 A EP94907749 A EP 94907749A EP 94907749 A EP94907749 A EP 94907749A EP 0685018 B1 EP0685018 B1 EP 0685018B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- girders
- concrete
- deck
- bridge
- slab
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
Definitions
- a bridge small, average or great, is usually composed of two parallel main girders, made of steel or concrete, extended from one abutment to another, directly or via a number of intermediate supports.
- the girders carry a bridge deck for the relevant traffic, its load being transmitted to ground via the girders and the bridge supports.
- the bridge deck, connected to the bridge girders consists of structures made of timber, steel or concrete or a combination of these materials, and it is usually covered by a surfacing of bitumen or concrete.
- the bridge girders are also connected to each other by means of cross beams or other transverse connections, spaced accordingly.
- girder bridges One traditional way of making girder bridges is to design the bridge slab with reinforcement that rigidly connects the slab to massive concrete girders. Another common way is to use steel girders, e.g. I-girders where the top flange is connected to a flexible web below.
- steel girders e.g. I-girders where the top flange is connected to a flexible web below.
- the former construction is complicated and cost consuming to build. The latter leads to extensive temperature movements at non-consistent weather conditions, and requires bracing and care at execution.
- a concrete slab on top of main steel girders is usually made on a scaffolding, which is put directly on to the girders. It may be prefabricated or made in situ. Usually traditional scaffolding is used for small and average bridges, and prefabricated scaffoldings for large bridges. The scaffolding may either extend along the entire bridge, or be built for every new section of the bridge slab that should be made. Before the casting reinforcement has to be fixed accurately to the bottom and the top of the mould, and around the welded studs on the girders as well. Hence the concrete slab can bear bending moments, which in some cases generate tension and a risk of cracking at the bottom or top of the slab, contributing to the later detoriation of the concrete and the reinforcing bars.
- the slab is terminated on both sides of the bridge by reinforced edge beams with a complicated formwork, into which balusters are to be cast. This design makes production steps cost consuming, time consuming, and dangerous, and makes the construction sensible to deficiencies in material and execution.
- a concrete slab on concrete main girders is usually made in a similar way, except for the fact that scaffolding is required for the girders as well.
- the girders and the slab are connected with moment- and shear resistant reinforcement.
- Working with scaffolding, formwork, reinforcement, and removal of the formwork are time consuming and dangerous construction steps.
- the slab may be depressed between the main girders, making the bridge through-shaped.
- a bridge construction of the kind referred to is disclosed in DE-C- 914 258.
- the main girders and the bridge deck form a rigidly connected unit as the connections between the girders and the bridge deck will transfer restrain moments between the bridge deck and the girders.
- the slab is rigidly connected to the girders, e.g. by reinforcement. Even in this case there is a risk of cracking of the slab, both at the top and at the bottom, and a consequent risk of deterioration of the concrete and the reinforcement.
- the traditional way of carrying the load to the main girders is to let reinforcing bars in the concrete slab carry the tensile forces of the bending moment.
- the slab is generally too thin to allow shear reinforcement to be used. In order to carry transverse forces from wheel loads and other loads, it must therefore be made extensively thick.
- An alternative way of carrying tensile forces from bending moments is to use lost scaffolding made of corrugated steel sheet, with intrusions or extrusions supposed to grip to the bottom surface of the concrete slab. This method is not generally accepted, and is not used for road bridges.
- the aim of the invention is to provide an overall solution to the actual problem.
- the invention is a new way to combine known structural elements with purely new designed elements in order to avoid the disadvantages mentioned above. With the invention, speed, economy, and safety in execution of the job are achieved.
- the bridge is composed of preferably two main girders with a closed cross section and a depth greater than the width, preferably filled with plain concrete.
- a self-supporting and remaining steel deck extends from one girder to the other, and carries the load of a concrete slab which is cast on top of it.
- the deck preferably consists of steel case profiles in composite action with the concrete, and with crossbars placed in notches in the case profiles, according to WO-A-94 10 385.
- the deck is connected to each girder, to the bottom flange, and the slab is cast against the girder side, in order to generate neglible restraint moments from the girders when loading the slab, whereas moments of the opposite sign can be transmitted from one girder to the other by bending of the slab.
- Transverse force from the deck is transmitted to the girders by the steel deck without need for reinforcing bars.
- the bottom of the slab is protected by the remaining steel deck, which is preferably hot dip galvanized. Possible cracking is concentrated to the surface between deck construction and girder. Leakage at this point is preferably prevented by making the edge of the deck construction elevated and closed by an elastic sealant.
- the capacity of the deck construction to transfer bending moment from one girder to another reduces the torsion in the girders at the supports.
- the invention also includes a method to produce permanent compressive stress at the top of the slab, for increased protection against water penetration.
- the steel bottom is simultaneously exposed to tension; in this area however the concrete is protected by the preferably hot dip galvanized case profiles.
- the state of strain is achieved by pressing the case profiles, which are connected to the main girders, upwards before casting by means of a temporary beam, intermediate and parallel to the girders.
- the latter is, in its turn, connected to cross beams, preferably connected to the outside of the girders, which will consequently twist slightly outwards when applying the press power.
- the method is particularly suitable for road bridges with a great width, since the steel deck is continuously supported by the temporary beam during casting.
- the bridge may be cable stayed where spans are greater.
- the girders are preferably designed with an inclined exterior side, onto which exterior plates are directly welded, suitable for connection of the cables.
- the attachment plates and the cables form a plan, substancially parallel to and eccentric to the torsion centre line of the girder.
- the girders are, at least at some points, supported by columns or cross beams, capable to resist the residual torsion from load on the slab or eccentric cables.
- the columns are preferably made of prepainted steel tubes, inclined in pairs with a foundation in common, from that extending upwards and outwards in such a way that they directly carry their own girders. By this means an aesthetic aspect is obtained, and disturbing drainage pipes from the slab may be hidden in the columns.
- the columns and part of the slab or a cross beam form a closed V-shape, suitable to carry relevant forces.
- the columns are preferably filled with pure concrete in order to resist collision.
- the invention with or without concrete filling, is also suitable for temporary bridges or fly-overs.
- the permanent slab is then substituted by a number of deck elements, locked up between the girders and fixings at the bridge ends.
- the main girders are connected rigidly by at least two cross beams, which need not to be located at the ends of the bridge.
- the advantage with this construction is that the bridge deck is situated at the ground level, making both excavation and embankment up to the level of the deck unnecessary.
- the girders form natural collision barriers, which makes temporary safety fences excessive as well. Transverse force between the deck elements may be transmitted by support plates welded to the bottom of the elements with a specific gap, and arranged in such a way that the support plates on one element is active when loading the adjacent ones.
- the load carrying function of the safety fence is with the invention substituted by the concrete-filled girders.
- the finishing railing may therefore be designed unspliced and aesthetic.
- the bridge girders are put on steel columns filled with concrete, and the columns are rigidly connected to the ground.
- the steel columns and the steel deck or a separate tension member form a closed V-shape. Drainage pipes are hidden in the steel columns.
- the case profile of the deck is made of steel plate in the thickness range 4 to 7 mm.
- the case profile is hot dip galvanized.
- the girders are 700 to 1500 mm deep.
- the column section is circular with a diameter of 500 mm. Girders, railings, and columns are painted in matching colors.
- a method to produce permanent compression in the entire top area of the slab may be as follows.
- the steel deck, connected to the bottom flanges of the girders, is before casting pressed upwards by means of a temporary longitudinal beam, which is supported by temporary cross beams, which are being raised by turning nuts on threaded bars.
- a temporary longitudinal beam which is supported by temporary cross beams, which are being raised by turning nuts on threaded bars.
- threaded bars When the concrete is hardened the threaded bars are loosened and the slab will deflect elastically to a level of equilibrium, characterized by a slightly excessed bottom of the slab and a top with compression in the concrete.
- the main girders are connected rigidly to cross beams. Between the girders, and on top of their bottom flanges, deck elements are put, the deck elements being furnished with support plates, welded to the bottom of the elements with a specific gap.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
Description
Claims (4)
- Permanent bridge structure including main girders and a deck construction connected to the girders at the lower edge thereof, characterized in that the deck construction includes a steel deck connected to the girder lower flanges by connections withstanding tensile forces and a concrete body slab cast upon the deck inside the and abutting the girders, the abutment between the side faces of the cast slab and the girder insides transferring compression forces between the girders and the cast slab.
- Bridge structure according to claim 1, characterized in that the girders are filled with plain concrete.
- Temporary bridge structure including main girders and a deck construction connected to the main girders at the lower edge thereof, characterized in that the girders are rigidly connected to at least two cross beams and that the deck construction consists of temporary elements locked up between the girders (1) and fixings at the bridge ends, and that the temporary elements have support plates welded to the bottoms of the elements, said support plates arranged to mutually support adjoining elements.
- Method for producing permanent pressure in the entire top of the slab of the bridge structure according to claim 1 or 2, characterized in that the steel deck, which is connected to the bottom flanges of the girders, before casting is pressed upwards by means of a longitudinal beam connected to cross beams, which are eccentrically connected to the exterior side of the main girders, and that the press power is released after hardening of the concrete.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9300502A SE502338C2 (en) | 1993-02-16 | 1993-02-16 | Bridge construction and method of achieving such bridge construction |
SE9300502 | 1993-02-16 | ||
PCT/SE1994/000101 WO1994019543A1 (en) | 1993-02-16 | 1994-02-09 | Bridge structure |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0685018A1 EP0685018A1 (en) | 1995-12-06 |
EP0685018B1 true EP0685018B1 (en) | 1998-10-14 |
Family
ID=20388909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94907749A Expired - Lifetime EP0685018B1 (en) | 1993-02-16 | 1994-02-09 | Bridge structure |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0685018B1 (en) |
AT (1) | ATE172263T1 (en) |
DE (1) | DE69413950T2 (en) |
DK (1) | DK0685018T3 (en) |
ES (1) | ES2125439T3 (en) |
FI (1) | FI953847A (en) |
NO (1) | NO304801B1 (en) |
SE (1) | SE502338C2 (en) |
WO (1) | WO1994019543A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104499415A (en) * | 2014-08-15 | 2015-04-08 | 上海市政工程设计研究总院(集团)有限公司 | Main girder structure system of double-layer bridge deck cable-stayed bridge |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103485271B (en) * | 2013-09-23 | 2015-11-04 | 浙江省交通规划设计研究院 | A kind of mountainous rural area People's Bank of China prestressed cable-truss bridge |
DE102016114855A1 (en) * | 2016-08-10 | 2018-02-15 | Max Bögl Stiftung & Co. Kg | Trough-shaped superstructure for a bridge, bridge, precast concrete part for a trough of a bridge and method for the construction of a bridge |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE914258C (en) * | 1940-08-29 | 1954-06-28 | Kurt Prange Dr | Bridge |
CH507417A (en) * | 1969-10-03 | 1971-05-15 | Vevey Atel Const Mec | Bridge |
SE374940C (en) * | 1972-02-29 | 1984-07-09 | Plymoth Garageplattor Ab | VIEW TO MAKE A CONCRETE ROOF LAYER WITH HIGH RESISTANCE TO TENSION CRACKS IN THE SURFACE AND AGAINST WATER POWER TRANSFER |
US4007507A (en) * | 1975-11-11 | 1977-02-15 | Hansen Carl E | Bridge composed of individual sections assembled by means of an assembling unit |
DE2928513A1 (en) * | 1979-07-14 | 1981-01-29 | Peter Dipl Ing Dr Techn Wagner | Demountable steel flyover bridge superstructure - comprises triangular main roadway girder, side border and possibly footpath carriers |
-
1993
- 1993-02-16 SE SE9300502A patent/SE502338C2/en not_active IP Right Cessation
-
1994
- 1994-02-09 WO PCT/SE1994/000101 patent/WO1994019543A1/en active IP Right Grant
- 1994-02-09 EP EP94907749A patent/EP0685018B1/en not_active Expired - Lifetime
- 1994-02-09 DE DE69413950T patent/DE69413950T2/en not_active Expired - Fee Related
- 1994-02-09 AT AT94907749T patent/ATE172263T1/en not_active IP Right Cessation
- 1994-02-09 ES ES94907749T patent/ES2125439T3/en not_active Expired - Lifetime
- 1994-02-09 DK DK94907749T patent/DK0685018T3/en active
-
1995
- 1995-08-10 NO NO953152A patent/NO304801B1/en not_active IP Right Cessation
- 1995-08-15 FI FI953847A patent/FI953847A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104499415A (en) * | 2014-08-15 | 2015-04-08 | 上海市政工程设计研究总院(集团)有限公司 | Main girder structure system of double-layer bridge deck cable-stayed bridge |
Also Published As
Publication number | Publication date |
---|---|
DK0685018T3 (en) | 1999-06-23 |
SE9300502D0 (en) | 1993-02-16 |
ATE172263T1 (en) | 1998-10-15 |
NO953152D0 (en) | 1995-08-10 |
NO304801B1 (en) | 1999-02-15 |
DE69413950T2 (en) | 2000-07-20 |
SE9300502L (en) | 1994-08-17 |
SE502338C2 (en) | 1995-10-02 |
FI953847A0 (en) | 1995-08-15 |
NO953152L (en) | 1995-08-15 |
ES2125439T3 (en) | 1999-03-01 |
DE69413950D1 (en) | 1998-11-19 |
FI953847A (en) | 1995-08-15 |
WO1994019543A1 (en) | 1994-09-01 |
EP0685018A1 (en) | 1995-12-06 |
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