DE102009026004A1 - Method for extension of existing bridge, involves assembling cantilever brackets to form extension cross-section, removing existing road surface on part of bridge, concreting cross-section, making seal, and building actual road surfaces - Google Patents

Abstract

The method involves installing struts between bars (6-9) of a bridge (1) over entire length of the bridge, and casting an external transverse prestressed concrete. Cantilever brackets are assembled to form an extension cross-section. The cantilever brackets are adjusted, and an existing road surface on a part of an existing bridge is removed. The extension cross-section is concreted, and a seal is made. Actual road surfaces (2-5) are built, and existing cantilevers (10, 11) are removed before mounting the cantilever brackets.

Description

The The invention relates to a method for widening an existing one Bridge.

Out The practice is known in broadening existing bridges either the existing bridges demolish and completely through a new bridge or an installation of the existing bridge is necessary, to make a widening. This equipment is very elaborate and expensive. The demolition of an existing bridge and new construction of a new one bridge is also very expensive.

The The technical problem underlying the invention is that to provide a method for widening an existing bridge, which economical carried out can be.

This technical problem is solved by a method having the features according to claim 1 solved.

• a) Einbau von Druckstreben,
• b) Einbau einer externen Quervorspannung,
• c) Montage von Kragarmkonsolen zur Bildung eines Ergänzungsquerschnittes,
• d) Justieren der Kragarmkonsolen,
• e) Abtrag eines bestehenden Straßenbelages auf wenigstens einem Teil der bestehenden Brücke,
• f) Betonieren des Ergänzungsquerschnittes,
• g) Herstellen einer Abdichtung,
• h) Herstellen eines Fahrbahnbelages.

The method according to the invention for broadening an existing bridge has the following method steps:

• a) installation of pressure struts,
• b) installation of an external transverse preload,
• c) mounting cantilever brackets to form a supplementary cross-section,
• d) adjusting the cantilever brackets,
• e) removal of an existing road surface on at least part of the existing bridge,
• f) concreting the supplementary cross-section,
• g) producing a seal,
• h) producing a road surface.

The inventive method has the advantage that the arrangement of Kragarmkonsolen the Formation of a supplementary cross-section a significant cost savings, since not one more is necessary that the bridge must be scaffolded. On the other hand deleted the formwork that is otherwise required to a roadway widening make. The special feature of the Kragarmkonsolen is that this on the one hand serve as formwork and on the other hand absorb the load capacity.

According to the method of the invention First, an installation of pressure struts, the advantageous between the jetties of the bridge to be ordered. Subsequently he follows the installation of an external transverse bias also for Absorption of forces. Subsequently In a further process step, the assembly of the cantilever consoles is carried out to reach the actual widening of the bridge, that is, to one Supplement section to build.

These Cantilever brackets are subsequently adjusted, that is, they are shifted so far across the lane direction that they to each other, that is, are aligned to adjacent Kragarmkonsolen.

The Kragarmkonsolen are advantageously made of steel.

On the existing part of the bridge At least partially, the existing road surface is then removed. Subsequently or at the same time the concreting of the supplementary cross-section takes place. thereto includes the process step of producing a seal. On this seal, it is then possible, the actual road surface manufacture.

The inventive method points over it addition to the advantage that broadening of the existing bridge at be made on the basis of current traffic. Will the existing road surface only on a part of the existing bridge, ie in a lane direction made and mounted on this page the Kragarmkonsolen and the work done, traffic on the other half of the bridge keep running while the bridge ver is broadened. If one side of the bridge widening is completed, the broadening can be done on the other side.

has the existing bridge an existing cantilever without transverse preloads, the old Cantilever can be removed. Are cantilevers with transverse preloads available, remain these cantilevers and the inventive method is carried out.

According to one advantageous embodiment of the Invention are existing before mounting the Kragarmkonsolen Lines laid in line routes. This transfer to the line routes takes place advantageously in hollow boxes, those in the bridge exist or be created. If there are no hollow boxes, The line routes are laid between the bars.

To the assembly of cantilever brackets it is possible to arrange a railing and / or Randabweiser provide and / or a mounting of lighting masts perform.

The inventive method runs favorably in the following construction stages.

Construction section 1:

• - Installation from struts over the entire length of the structure,
• - Allocation of all existing lines between The hollow boxes in conduit cups.

Construction section 2:

• - traffic transfer,
• - removal the provisional sidewalk and the cantilever (if no transverse preloads available),
• - Installation an external bias on one side in the hollow box,
• - Assembly the Kragarmkonsolen and concreting the supplementary cross-section,
• - Produce a seal,
• - Assembly a railing, of edge deflectors and lighting poles,
• - removal of transverse fields,
• - Dismantling a protective framework.

Construction section 3:

• - traffic transfer,
• - removal the existing road surface,
• - concreting of the concrete,
• - Produce the seal and the road surface.

Further Can work yes carried out as needed become, for example, a Mittelpfeilerverbreiterung, if this required for static reasons is.

Further Features and advantages of the invention will become apparent from the accompanying drawings, in the several process steps for widening a bridge only are shown by way of example. In the drawing show:

1 an existing bridge in cross section;

2 a widened bridge in cross section;

3 a widened bridge in cross-section with struts and biasing devices.

1 shows a bridge 1 , the four lanes 2 . 3 . 4 . 5 having. The bridge is from Stegen 6 . 7 . 8th . 9 carried.

The bridge 1 has cantilevers 10 . 11 on.

The bridge 1 should be broadened, by about 35%.

As in 2 shown are the cantilever arms 10 . 11 ( 1 ) has been removed. The bridge 1 now has cantilever brackets 12 . 13 on. The cantilever consoles 12 . 13 have a substantially triangular cross-section to the forces occurring on a surface 14 , which act in the direction of arrows A, record and enter into the existing bridge construction.

According to 3 is the bridge 1 with the cantilever brackets 12 . 13 shown. So that of the Kragarmkonsolen 12 . 13 in the footbridges 6 . 9 initiated forces can be absorbed, before arranging the Kragarmkonsolen 12 . 13 a transverse preload 15 been installed. The transverse preload 15 in the form of tie rods is arranged over the entire length of the structure at certain intervals.

In addition, there are struts 16 been arranged, also around by the Kragarmkonsolen 12 . 13 absorb occurring forces.

Additionally is at the bridge 1 an external bias 17 in the area of the bridges 6 . 7 as well as in the area of the bridges 8th . 9 arranged. Through the bars 6 . 7 ; 8th . 9 each becomes a hollow box 18 . 19 educated. In this hollow box (deflecting saddle) is provided in the longitudinal direction of the bridge, that is perpendicular to the plane of a bias, which is referred to as external bias. As with the other biases, it is the external bias 17 suitable biasing means such as iron carriers, steel beams or the like, which are fixed to the structure.

In addition, on the outsides of the webs 6 . 9 an internal bias 20 arranged. The internal bias can be performed, for example, with an additional mesh reinforcement. This mesh reinforcement is embedded in concrete and therefore referred to as internal bias.

After arrangement of the bias voltages 17 . 20 become the cantilever consoles 12 . 13 assembled. After mounting, the cantilever brackets are adjusted.

Subsequently, the existing road surface is removed, for example, on one side of the existing roadway. Traffic can continue on the other side of the existing bridge. After the removal of the road surface, the supplementary cross section, that is the area on the cantilever bracket 12 . 13 concreted. Subsequently, a seal is made over the entire roadway half and then the road surface is produced.

Of the Traffic can follow on the newly manufactured half the bridge be put down and the other half the bridge can be widened in the same way.

• a) Einbau von Druckstreben 16,
• b) Einbau einer externen Quervorspannung 15,
• c) Montage von Kragarmkonsolen 12, 13 zur Bildung eines Ergänzungsquerschnittes,
• d) Justieren der Kragarmkonsolen 12, 13,
• e) Abtrag eines bestehenden Straßenbelages auf wenigstens einem Teil der bestehenden Brücke 1,
• f) Betonieren eines Ergänzungsquerschnittes,
• g) Herstellen einer Abdichtung,
• h) Herstellen eines Fahrbahnbelages.

In this way it is possible to widen the bridge while traffic is running. The inventive method for broadening an existing bridge 1 runs as follows:

• a) Installation of pressure struts 16 .
• b) Installation of an external transverse preload 15 .
• c) Installation of cantilever brackets 12 . 13 for forming a supplementary cross-section,
• d) Adjusting the cantilever brackets 12 . 13 .
• e) removal of an existing road surface on at least part of the existing bridge 1 .
• f) concreting a supplementary cross-section,
• g) producing a seal,
• h) producing a road surface.

According to 3 rejects the. Bridge after widening the lanes 2 . 3 . 4 . 5 and the extra lanes 21 . 22 on as well as sidewalks 23 and a bike path 24 ,

In the area of Kragarmkonsolen 12 . 13 are additional bridge reinforcements 25 intended.

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Claims (8)

Method for widening an existing bridge with the following method steps: a) Installation of compression struts ( 16 ), b) installation of an external transverse preload ( 15 ), c) installation of cantilever brackets ( 12 . 13 ) for forming a supplementary cross-section, d) adjusting the cantilever consoles ( 12 . 13 e) removal of an existing road surface on at least part of the existing bridge, f) concreting of the supplementary cross-section, g) production of a seal, h) production of a road surface. Method according to claim 1, characterized in that the installation of pressure struts ( 16 ) is carried out over the entire length of the structure. Method according to claim 1 or 2, characterized in that the installation of pressure struts ( 16 ) between webs ( 6 . 7 . 8th . 9 ) the bridge ( 1 ) is carried out. Method according to one of the preceding claims, characterized in that an existing cantilever arm ( 10 . 11 ) before mounting the cantilever brackets ( 12 . 13 ) Will get removed. Method according to one of the preceding claims, characterized in that prior to assembly of Kragarmkonsolen ( 12 . 13 ) existing lines are transferred in line cups. Method according to one of the preceding claims, characterized in that after mounting the Kragarmkonso len ( 12 . 13 ) a mounting of a railing and / or edge deflectors and / or lighting poles done. A method according to claim 1, characterized in that the method steps b) to h) only for a road side of the bridge ( 1 ) and then for a second lane side of the bridge ( 1 ) be performed. Method according to one of the preceding claims, characterized in that the adjustment of the Kragarmkonsolen ( 12 . 13 ) transverse to a longitudinal axis of the bridge ( 1 ) is carried out.