RU2534556C1 - Removal method of girder reinforced-concrete superstructure of bridge using cable-supported system - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to bridge construction, and namely to a bridge removal method and device. The removal method of a girder reinforced-concrete superstructure of a bridge using a cable-supported system allows removing the superstructure as quick as possible from its location and a possibility of removal of the superstructure onshore due to the fact that hydraulic jacks are installed under the lower flange for jacking; after that, channels are installed under the lower flange of girders; then, a metal traverse is installed; after that, the traverse is combined with channels; a pylon is installed on the traverse; stay cables are suspended and tightened; after that, supporting parts of girders are replaced with a moving device; the superstructure is removed together with the formed assembled structure onto receiving jigs arranged onshore, and the superstructure is disassembled. Channels for the lower flange of girders are installed in longitudinal direction. The traverse is installed along the whole superstructure of the bridge to be disassembled. The traverse and the channels are combined by means of vertical tie-rods with further welding to each other. The pylon is installed for example in the middle of the superstructure. As the moving device, rollers or fluoroplastic gaskets are used.

EFFECT: invention allows improving removal efficiency due to removal of the superstructure as quick as possible from its location place and possibility of its onshore disassembly.

7 cl, 5 dwg

Description

The invention relates to bridge construction, and in particular to a method and device for dismantling bridges.

Known patent for the invention of the Russian Federation No. 2250285, IPC E01D 22/00. "A way to replace the bridge span." A method of replacing the bridge span, including installing on the floating supports of the existing span to be dismantled, followed by dismantling the span using at least one load-lifting crane, loading disassembled span elements onto the floating means and delivering them to the shore and erecting a new bridge span , characterized in that when dismantling the existing metal through span with belts, braces, racks, suspension Before installation of the span to be dismantled on floating supports in the alignment of the span support units, temporary piers are erected and transverse movement of the span to be dismantled is made with its support on temporary piers, after which a new span is erected along the longitudinal axis of the bridge and installed on it a hoisting crane, and under the span to be dismantled, two floating supports are placed at one of the ends of this span of the span, and dismantling of the span is carried out from one end of the span to the other with the initial transfer of load from the span from one of the piers to both floating supports, and as the dismantling of the elements of the span, each floating support located on the side of the dismantled section, after dismantling this the section is moved along the dismantled span and installed behind the second floating support, while the dismantling of the elements of the span is carried out using a crane, displaced along the erected new span as the dismantling section moves, and the dismantling of sections of the existing span is done from top to bottom by initial cutting of linear elements of the upper belt, then racks, suspensions, braces, and then elements of the lower belt, while the cuts are cut separately or together with struts and pendants. When the span to be dismantled is supported by floating supports, each floating support is anchored. Before cutting out any element of the dismountable span, this element is slinged to the crane hook with slings in a slightly tightened state. Span cutting works are carried out from suspended scaffolds. When replacing the span of a two-way bridge, work to replace the span under the second path is carried out similarly to the work on replacing the span under the first path.

The disadvantage of this method is that it is quite time-consuming, requires the construction of additional structures and additional equipment, and during the proposed dismantling of the bridge, it is necessary to occupy a bridge space (water area) for a long time.

The closest (prototype) to the claimed invention is the patent for the invention of the Russian Federation No. 2304656, IPC E01D 22/00, "Method for dismantling the volumetric blocks of the lattice span of the bridge." The method of dismantling by volume blocks of the trellis span of the bridge with a height of the upper belt above the water level of up to 30-35 m and with a span of more than 40 m, including the construction of temporary auxiliary supports at the points of division of trusses of the span on volume blocks, the installation of hydraulic jacks on temporary auxiliary supports under the lower nodes of the trusses, their temporary fixation, at least for the period of division, from vertical movement by wedging with steel sheets on the main or auxiliary supports, disassembling parts in the zone of volume blocks, dividing into volume blocks of at least 20 m long span by cutting or cutting individual elements of the truss while ensuring the regulation of internal forces in the truss by means of a wedge and / or using hydraulic jacks installed on auxiliary supports within the limits of the elements trusses of static loads not exceeding the calculated ones, slinging, exemption from temporary fixation and dismantling of the isolated blocks with a floating crane with a lifting capacity of at least 80 tons with movement them to pre-prepared receiving berths for disaggregating them on the shore and dismantling temporary auxiliary supports. The division of the farm is carried out initially along the upper, then along the lower belts, starting from the top plane of the farm. The receiving stocks are placed on the shore, and the disengaged blocks are moved on them by a floating crane immediately after their dismantling, excluding transfer to a barge or ram. Receiving stocks are placed on the shore, and the disengaged blocks are moved on them by a floating crane after they are transferred to a barge or ram.

The disadvantages of this method is the complexity of the additionally performed work, the attraction of a large number of equipment and the long lead time directly under the span, which prevents the use of a bridge space (water area).

The objective of the invention is the most rapid removal of the span from the place of its deployment and the ability to dismantle the span on the shore.

The problem is solved due to the fact that hydraulic jacks are installed under the lower belt for jacking, after which channels are installed under the lower belt of the beams, then a metal beam is installed, then the beam is combined with channels, then a pylon is constructed on the beam, then the cables are suspended and pulled, after that, the supporting parts of the beams are changed to a movable device, after which the span, together with the prefabricated structure, is pulled to receiving berths located on the shore, and disassemble the span. Channels under the lower belt of beams are installed in the longitudinal direction. Traverse installed along the entire span of the bridge to be disassembled. Traverse and channels are combined by means of vertical rods with subsequent welding among themselves. A pylon is built, for example, in the middle of the span. As a mobile device, rollers or fluoroplastic pads are used.

The essence of the invention is illustrated by drawings.

Figure 1 shows a fragment of an existing beam reinforced concrete span bridge.

Figure 2 shows a fragment of the connection channels, installed under the lower belt of beams with traverse.

Figure 3 shows the span of the bridge with installed channels and traverse along the entire span.

Figure 4 shows the span of the bridge with an installed pylon, channels and traverse, tensioned cables and installed instead of the supporting parts of the beams with a movable device.

Figure 5 shows the span of the bridge, shifted by a certain distance, with an installed pylon, channels and a traverse, tensioned cables and a movable device installed instead of the supporting parts of the beams.

The method of dismantling the beam reinforced concrete span structure 1 of the bridge using the cable-stayed system 2 consists of the following operations: install hydraulic jacks (not shown) under the lower belt 3 of the beams 4, then jack the span structure 1, after which the channels 5 are installed under the lower belt 3 of the beams 4, then a metal cross-beam 6 is installed, then the cross-beam 6 is combined with channels 5, then a pylon 7 is built on the cross-beam 6, then the cables 8 are suspended and pulled, then the supporting parts 9 are changed (for example, the block i) the beams 4 on the movable device 10, after which the span 1 is pulled together with the prefabricated structure 11 formed from the beams 4, channels 5 and the traverse 6, onto receiving berths 12 located on the bank 13, and the span 1 is dismantled (see Fig. .1, 2, 3, 4, 5).

The channels 5 under the lower belt 3 of the beams 4 are installed in the longitudinal direction (see figure 2).

Traverse 6 is installed along the entire span 1 of the bridge to be disassembled. Traverse 6 and channels 5 are combined by means of vertical rods 14 with subsequent welding between themselves (see Fig. 2, 3, 4, 5).

Pylon 7 is built, for example, in the middle of the span 1 (see figure 4, 5).

As the mobile device 10, rollers 15 or fluoroplastic spacers 16 are used (see Figs. 4, 5).

As a result of the proposed work, the span can be dismantled without the use of lifting equipment and the construction of additional structures.

The use of a cable-stayed system and a prefabricated structure makes it possible to balance the span in such a way that it does not crack, does not deform, and will not be skewed or shifted while stretching the span to the receiving berths.

The problem is solved due to the proposed sequence and combination of works in the proposed method, namely:

1. Jack the span 1 hydraulic jacks installed under the lower belt of beams (not shown).

2. Install channels 5 with a tight fit to the beam 4.

3. Set the metal traverse 6 to strengthen the long structure of the span 1.

4. Combine the traverse 6 with the channels 5 by means of screed vertical rods 14 and the use of welding.

5. On the reinforced prefabricated structure 11, consisting of beams 4, pulled together by traverse 6 and channels 5, install the pylon 7.

6. Hang the cables 8, after which they are pulled, thereby strengthening the prefabricated structure 11.

7. Change the supporting parts 9, for example blocks, to a movable device 10, for example rollers 15 or fluoroplastic gaskets 16.

8. Draw the span 1 to the receiving stocks 12, installed on the shore 13.

9. Dismantle the span 1.

Industrial applicability is that for the implementation of the proposed method using well-known equipment used in various fields and not requiring additional manufacture and refinement.

All of the above indicates a solution to the problem, namely:

List of items

1. The span

2. Byte system

3. Lower belt

4. Beam

5. Channel

6. Traverse

7. Pylon

8. The guy

9. The supporting part

10. Mobile device

11. Prefabricated structure

12. Receiving stocks

13. The shore

14. Vertical traction

15. Rollers

16. PTFE gasket

Claims (7)

1. A method of dismantling a reinforced concrete beam span of a bridge using a cable-stayed system, comprising installing hydraulic jacks under the lower belt for jacking and placing receiving slides on the shore, characterized in that after installing hydraulic jacks and jacking, channels are installed under the lower belt of the beams, then installed metal traverse, after which the traverse is combined with the channels, then a pylon is built on the traverse, then the cables are suspended and pulled, then the supporting parts of the beams are changed to a movable device, after which the span is pulled together with the formed prefabricated structure onto the stocks and the span is disassembled. 2. The method according to claim 1, characterized in that the channels under the lower belt of the beams are installed in the longitudinal direction. 3. The method according to claim 1, characterized in that the beam is installed along the entire span of the bridge to be disassembled. 4. The method according to claim 1, characterized in that the beam and channels are combined by means of vertical rods with subsequent welding between themselves. 5. The method according to claim 1, characterized in that the pylon is constructed, for example, in the middle of the span. 6. The method according to claim 1, characterized in that the roller is used as a mobile device. 7. The method according to claim 1, characterized in that as a mobile device using fluoroplastic gaskets.

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