CN111705682B - Construction method and equipment for dismantling and reconstructing upper structure of widening bridge across electrified railway - Google Patents

Abstract

The present invention discloses a construction method and equipment for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway, wherein the widened bridge across an electrified railway is an original bridge with a left span and a right span, and comprises the following steps: S1, assembling a bridge segment outside the right span of the original bridge; S2, guiding the traffic of the left span of the original bridge to the right span of the original bridge in step S1, and dismantling the left span of the original bridge; S3, reconstructing at the original site where the left span of the original bridge was dismantled; S4, guiding the traffic guided to the right span of the original bridge in step S2 to the new left span of the original bridge in step S3; S5, dismantling the right span of the original bridge, and building a new bridge again at the original site where the right span of the original bridge was dismantled; S6, sliding and splicing the assembled bridge segment laterally in the direction of the newly built bridge. The present invention has the technical effects of stable structure and excellent construction process, and the present invention can be widely used in the field of building construction technology.

Description

A construction method and equipment for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway

Technical Field

The present invention relates to the technical field of building construction, and more specifically, to a construction method and equipment for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway.

Background Art

In recent years, my country's highway construction has achieved rapid development, playing an important basic guarantee role in the rapid development of the national economy. However, with the rapid development of my country's economy and society, some of the early highways, especially some four-lane highways, have shown a situation of saturated traffic and very tight transportation capacity. The road capacity and service level have decreased, and safety accidents have gradually increased. They can no longer meet the needs of economic and social development and urban and rural construction. The reconstruction and expansion of highways has become an important and urgent task in the construction of my country's transportation infrastructure. The implementation of the highway reconstruction and expansion project will inevitably interfere with the existing traffic flow, especially the demolition and reconstruction of the existing railway bridges. It is necessary to complete the demolition, slag transportation, protection, and new construction of the bridges in the shortest time and limited working surface. In addition, in the 1990s, the country began to electrify the original railways and added the upper contact network of the railway. The contact network voltage is 10~500kV. The upper bridge built under the original construction limit standard conditions is in urgent need of demolition and reconstruction to widen the bridge because the distance between the contact network and the bottom of the bridge beam is close after the electrification of the lower railway. In addition, due to the saturation of traffic volume on the upper railway and the upcoming end of the service life of the structure, most of the bridge widening construction must be carried out under the condition of maintaining traffic. Since the railway operating line is the main artery of national transportation, the construction of the operating line will affect the normal operation of the operating line. Traditional construction equipment and methods are not suitable for this type of construction;

The demolition and widening reconstruction of the overpass electrified railway bridge. After the electrification of the railway, the overpass bridge built under the previous construction limit standard has a small distance between the contact network and the bottom of the beam, and it is impossible to add protective measures during the construction of the operating line; the use of traditional construction equipment and methods cannot meet the requirements of construction period and traffic maintenance. In addition, the complex process requires many skylight points for the cooperation of the operating line construction, which is not conducive to construction cost control.

Summary of the invention

The purpose of the present invention is to provide a construction method for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway, which has a stable structure and excellent construction process.

In order to achieve these purposes and other advantages according to the present invention, a construction method for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway is provided, wherein the widened bridge across an electrified railway is an original bridge having a left span and a right span, comprising the following steps:

S1, constructing a bridge segment on the outer side of the right span of the original bridge;

S2, directing the traffic on the left span of the original bridge to the right span of the original bridge in step S1, and dismantling the left span of the original bridge;

S3, rebuilding the left span of the original bridge demolished in step S2 at its original location to form a new left span of the original bridge;

S4, guiding the traffic directed to the right span of the original bridge in step S2 to the new left span of the original bridge in step S3;

S5, dismantling the right span of the original bridge, and re-building a new bridge at the original site where the right span of the original bridge was dismantled;

S6, sliding and splicing the bridge segments assembled in step S1 in a direction of the newly built bridge in step S5 to form a new right span of the original bridge;

The new left width of the original bridge in step S4 and the new right width of the original bridge in step S6 form a new bridge.

Preferably, the dismantling of the left section of the original bridge in step S2 and the dismantling of the right section of the original bridge in step S5 both include:

The constraints between the beams and slabs of the original bridge are released and the bridge is divided into small modules.

Preferably, releasing the constraints between the beams and slabs of the original bridge comprises the following steps:

SS1, drilling holes at intervals along the length direction of the center lines of each two adjacent beams and plates to form a bridge deck of the original bridge having several rows of circular holes;

S2, cutting the segments between the adjacent drilled holes between the two beams and plates of the original bridge, until the segments between the adjacent drilled holes between all the adjacent beams and plates of the original bridge are cut, so as to form a plurality of independent single beams;

S3, installing dismantling equipment to dismantle and move all the single beams in step S2.

Preferably, when any one of the left and right bridge decks of the original bridge is undergoing the demolition process, the other bridge deck is set up as an operating line protection platform and a transportation channel.

A device for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway, characterized in that the dismantling device is a beam dismantling machine, which spans the left and right spans of the original bridge and is arranged directly above the original bridge, and is used to dismantle all the single beams of the superstructure of the original bridge;

The beam dismantling machine comprises a load-bearing frame supported and arranged on the bridge deck of the original bridge;

A supporting sliding device, which is supported and arranged on the load-bearing frame to form a cantilever;

The lifting mechanism can freely slide along the length direction of the support beam and be suspended at the bottom of the cantilever of the support beam, and is used for lifting all the single beams.

Preferably, the load-bearing frame comprises:

A plurality of pairs of load-bearing legs are arranged equidistantly along the transverse cross-sectional direction of the original bridge, and each pair of the load-bearing legs is located at the same longitudinal water surface cross-sectional position on the original bridge;

A pair of load-bearing cross beams, which are respectively erected directly above all the load-bearing legs located in the same transverse cross-sectional direction;

A plurality of load-bearing support beams, which are respectively arranged between each pair of load-bearing legs located in the same longitudinal section;

A plurality of adjustable fulcrum devices, all of which are respectively and correspondingly arranged directly below all of the load-bearing legs, are used to adjust the height of the load-bearing legs.

Preferably, all of the load-bearing legs include:

A pair of legs are arranged with their upper parts close together and their lower parts separated, and a plurality of connecting beams are arranged between the pair of legs.

Preferably, the supporting sliding device comprises:

A pair of traverse cranes, which are symmetrically arranged on a pair of load-bearing beams and can move freely along the length direction of the pair of load-bearing beams;

A longitudinal beam, both ends of which are respectively arranged on a pair of transverse overhead travelling cranes;

Wherein, the lifting mechanism is arranged on the longitudinal beam.

Preferably, it also includes a transfer trolley, which is arranged at the free end of the lifting mechanism and is used to load the single-piece beam. The bottom of the transfer trolley is provided with freely rolling walking wheels.

The present invention has at least the following beneficial effects:

(1) The demolition of small sections of beams and slabs simplifies the difficulty of bridge demolition.

(2) The beams and slabs are moved to another section of the bridge for dismantling, and the bridge is used as a protective platform for the operating line, eliminating the need to set up another platform.

(3) Six construction steps are used to dismantle the original bridge and build a new widened bridge, which can ensure that the traffic on the construction section is not affected during the construction period.

(4) Beam dismantling machine, with stable structure, rigid support frame, load-bearing beams spanning the left and right spans, and a transverse crane installed on the beams.

(5) The herringbone leg design of the beam demolition machine provides stable support, enhances construction safety, and has strong adaptability.

Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a cross-sectional direction of a new bridge segment assembled according to the present invention;

FIG2 is a schematic structural diagram of the longitudinal section direction of the new bridge segment assembled according to the present invention;

FIG3 is a schematic structural diagram of the longitudinal section direction of the beam dismantling machine of the present invention;

FIG4 is a schematic structural diagram of the cross-sectional direction of the beam dismantling machine of the present invention;

FIG. 5 is a schematic diagram of the structure of a single beam of the present invention.

Description of the accompanying drawings: 1. Steel beam assembly platform, 2. Single beam, 3. Pushing pier, 4. Protection and operation platform, 5. Track beam, 6. Pushing anti-deviation device, 7. Elevation adjustment block, 8. Guide beam, 9. Traction jack, 10. Traction rope, 11. Load-bearing legs, 12. Adjustable fulcrum device, 13. Load-bearing crossbeam, 14. Transverse crane, 15. Lifting mechanism, 16. Longitudinal beam, 17. Load-bearing support beam, 18. Transfer trolley, 201. Round hole, 202. Cutting seam.

DETAILED DESCRIPTION

The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

As shown in Figures 1-5, a construction method for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway, wherein the widened bridge across an electrified railway is an original bridge having a left span and a right span, comprises the following steps:

S1, constructing a bridge segment on the outer side of the right span of the original bridge;

S2, directing the traffic on the left span of the original bridge to the right span of the original bridge in step S1, and dismantling the left span of the original bridge;

S3, rebuilding the left span of the original bridge demolished in step S2 at its original location to form a new left span of the original bridge;

S4, guiding the traffic directed to the right span of the original bridge in step S2 to the new left span of the original bridge in step S3;

S5, dismantling the right span of the original bridge, and re-building a new bridge at the original site where the right span of the original bridge was dismantled;

S6, sliding and splicing the bridge segments assembled in step S1 in a direction of the newly built bridge in step S5 to form a new right span of the original bridge;

The new left width of the original bridge in step S4 and the new right width of the original bridge in step S6 form a new bridge.

In the above technical solution, during the construction of the bridge segment on the right side, a new bridge with a width of 1/4 of the original bridge is built on the right side of the original bridge;

During the new construction of the right and left sections of the new bridge, the pile foundation and the lower structure are constructed separately. The upper structure adopts the form of a steel box beam, and the support method is used for jacking construction. A steel beam assembly platform 1, a jacking pier 3, and a protection and operation platform 4 are set up. The track beam 5, the jacking anti-deviation device 6 and the elevation adjustment block 7 are installed on the jacking platform. The steel box beam and the guide beam 8 are assembled. After completing some segmental steel box beams, a traction jack 9 and a traction rope 10 are installed on the jacking pier 3 on one side to carry out jacking construction. During the process, the jacking anti-deviation device 6 is used to prevent the steel beam from deviating. The elevation is adjusted by the elevation adjustment block 7. The guide beam 8 is dragged until it falls on the jacking pier 3 on one side, and the dragging is stopped. The installation of the rear segment steel beam begins, and the above steps are repeated until the steel beam is dragged to the designed position.

During the demolition of the left and right spans of the original bridge, the constraints between the beams and slabs are first released: first, a water-grinding drill is used to drill holes along the center lines of adjacent beams and slabs to form several rows of circular holes 201, and then a rope saw is used to cut in the adjacent holes to form several rows of slits 202, completely releasing the constraints on the beams and slabs to form an independent single-piece beam 2; a beam dismantling machine is installed on the left and right decks of the old bridge, firstly the adjustable fulcrum device 12 is installed, then the load-bearing legs 11 are installed, then the load-bearing crossbeams 13 are installed, and then the load-bearing support beams 17 are installed to form a stable load-bearing frame; the transverse crane 14, the lifting mechanism 15, and the longitudinal beam 16 are pre-assembled outside the construction area to form a transverse lifting crane, and the transverse lifting crane is hoisted onto the weighing frame using lifting equipment, and the lifting mechanism 15 is dropped on the load-bearing crossbeam 13. The above steps constitute the beam dismantling machine, and the beam dismantling machine is tested and accepted. The crane moves horizontally to the top of the monolithic beam 2 to be dismantled on the left old bridge, lifts the monolithic beam 2 through the lifting mechanism 15, moves horizontally to the right old bridge, lowers the monolithic beam 2 to the transfer trolley 18 parked on the right old bridge, and is transported to the designated site by the transfer trolley 18; the monolithic beam 2 of the left old bridge is completely dismantled in this order, and then the beam dismantling machine on the left old bridge is dismantled, and the beam dismantling machine on the right old bridge is retained. The lower structure of the right old bridge is dismantled using conventional explosion-free technology.

In another technical solution, the dismantling of the left section of the original bridge in step S2 and the dismantling of the right section of the original bridge in step S5 both include:

The constraints between the beams and slabs of the original bridge are released and the bridge is divided into small modules.

In another technical solution, releasing the constraints between the beams and slabs of the original bridge comprises the following steps:

SS1, drilling holes at intervals along the length direction of the center lines of each two adjacent beams and plates to form a bridge deck of the original bridge having several rows of circular holes 201;

S2, cutting the segments between the adjacent holes between the two beams of the original bridge, until all the segments between the adjacent holes between the adjacent beams of the original bridge are cut, so as to form a plurality of independent single beams 2;

S3, installing dismantling equipment to dismantle and move all the single beams 2 in step S2.

In another technical solution, when any one of the left and right bridge decks of the original bridge is undergoing the demolition process, the other bridge deck is set up as an operating line protection platform and a transportation channel.

The present invention discloses a device for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway. The dismantling device is a beam dismantling machine, which spans the left and right spans of the original bridge and is arranged directly above the original bridge to dismantle all the single beams 2 of the superstructure of the original bridge.

The beam dismantling machine comprises a load-bearing frame supported and arranged on the bridge deck of the original bridge;

A supporting sliding device, which is supported and arranged on the load-bearing frame to form a cantilever;

The lifting mechanism 15 can be freely slid along the length direction of the support beam and is suspended at the bottom of the cantilever of the support beam, and is used to lift all the single beams 2.

In another technical solution, the load-bearing frame includes:

A plurality of pairs of load-bearing legs 11 are equidistantly arranged along the transverse cross-sectional direction of the original bridge, and each pair of the load-bearing legs 11 is located at the same longitudinal water surface cross-sectional position on the original bridge;

A pair of load-bearing cross beams 13, which are respectively erected directly above all the load-bearing legs 11 located in the same transverse cross-sectional direction;

A plurality of load-bearing support beams 17, which are respectively disposed between each pair of load-bearing legs 11 located in the same longitudinal section;

A plurality of adjustable fulcrum devices 12 are respectively and correspondingly arranged directly below all the load-bearing legs 11 for adjusting the height of the load-bearing legs 11 .

In the above technical solution, the adjustable fulcrum device 12 is installed first, then the load-bearing legs 11 are installed, then the load-bearing crossbeams 13 are installed, and then the load-bearing support beams 17 are installed to form a stable load-bearing frame.

In another technical solution, all of the load-bearing legs 11 include:

A pair of legs are arranged with their upper parts close together and their lower parts separated, and a plurality of connecting beams are arranged between the pair of legs.

In the above technical solution, a pair of split legs form an "eight"-shaped support structure, which has better stability and support.

In another technical solution, the supporting sliding device includes:

A pair of traverse cranes 14, which are symmetrically arranged on a pair of load-bearing beams 13 and can move freely along the length direction of the pair of load-bearing beams 13;

A longitudinal beam 16, both ends of which are respectively disposed on a pair of the transverse cranes 14;

The lifting mechanism 15 is arranged on the longitudinal beam 16 .

In the above technical solution, the transverse crane 14, the lifting mechanism 15, and the longitudinal beam 16 are pre-assembled outside the construction area to form a transverse lifting crane. The transverse lifting crane is hoisted onto the weighing frame using lifting equipment, and the lifting mechanism 15 is placed on the load-bearing beam 13.

In another technical solution, it also includes a transfer trolley 18, which is arranged at the free end of the lifting mechanism 15 and is used to load the single-piece beam 2. The bottom of the transfer trolley 18 is provided with freely rolling running wheels.

In the above technical solution, the transfer vehicle 18 is used to transport the dismantled single-piece beam 2 and to move the structure to be installed to the construction site.

Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims (8)

1. The construction method for dismantling and rebuilding the upper structure of the widening bridge of the cross-electrified railway is characterized by comprising the following steps:

S1, splicing and building bridge segments on the outer side of the right frame of the original bridge;

s2, guiding traffic of the left width of the original bridge to the right width of the original bridge in the step S1, and dismantling the left width of the original bridge;

s3, reconstructing the left-side original place of the original bridge removed in the step S2 to form a new left side of the original bridge;

s4, guiding the traffic guided to the right side of the original bridge in the step S2 to the new left side of the original bridge in the step S3;

S5, dismantling the right width of the original bridge, and newly building a bridge again at the site where the right width of the original bridge is dismantled;

S6, transversely sliding and splicing the spliced bridge segments in the step S1 towards the direction of newly-built bridge in the step S5 to form a new right width of the original bridge;

wherein, the new left width of the original bridge in the step S4 and the new right width of the original bridge in the step S6 form a new bridge;

When any bridge deck is dismantled, the other bridge deck is set to be a business line protection platform and a transportation channel.

2. The construction method for dismantling and rebuilding the upper structure of the widened bridge crossing the electrified railway according to claim 1, wherein the dismantling of the left width of the original bridge in the step S2 and the dismantling of the right width of the original bridge in the step S5 each comprise:

and releasing the constraint between the beam plates of the original bridge and dividing the original bridge into small modules.

3. The construction method for dismantling and rebuilding the bridge superstructure across the electrified railway according to claim 2, wherein the step of releasing the constraint between the bridge slabs of the original bridge comprises the steps of:

SS1, drilling holes at intervals along the length direction of the central line of each two adjacent beam plates to form a bridge deck of the original bridge with a plurality of rows of round holes;

S2, cutting the sections between adjacent drilling holes between two beam plates of the original bridge until the sections between the adjacent drilling holes between all the adjacent beam plates of the original bridge are cut, and forming a plurality of independent single beams;

And S3, installing and dismantling equipment, and dismantling and transporting all the single beams in the step S2.

4. A construction method for dismantling and rebuilding an upper structure of a widened bridge across an electrified railway according to any one of claims 1 to 3, wherein the equipment for dismantling the original bridge is a girder dismantling machine which spans the left and right sides of the original bridge and is arranged right above the original bridge for dismantling all single girders of the upper structure of the original bridge;

the beam disassembly machine comprises a bearing frame which is supported and arranged on the bridge deck of the original bridge;

a support sliding device which is supported and arranged on the bearing frame to form a cantilever;

And the lifting mechanism can freely slide and hang at the bottom of the cantilever of the supporting beam along the length direction of the supporting beam and is used for lifting all the single beams.

5. The construction method for dismantling and rebuilding a bridge superstructure across electrified railways according to claim 4, wherein said load-bearing frame comprises:

The bearing support legs are equidistantly arranged along the transverse section direction of the original bridge, and each pair of bearing support legs are positioned at the same longitudinal water surface section position on the original bridge;

The pair of bearing cross beams are respectively and correspondingly erected right above all the bearing support legs positioned in the same transverse cross section direction;

the bearing support beams are respectively and correspondingly arranged between each pair of bearing support legs positioned on the same longitudinal section;

and the adjustable fulcrum devices are respectively and correspondingly arranged under all the bearing support legs and are used for adjusting the heights of the bearing support legs.

6. The construction method for dismantling and rebuilding a bridge superstructure across an electrified railway widening according to claim 5, wherein all the load-bearing legs include,

The upper parts of the pair of the split legs are close, the lower parts of the pair of the split legs are separated, and a plurality of connecting beams are arranged between the pair of the split legs.

7. The construction method for dismantling and rebuilding a bridge superstructure across an electrified railway widening according to claim 4, wherein the supporting and sliding device comprises,

The pair of transverse traveling crown blocks are symmetrically arranged on the pair of bearing cross beams and can freely move along the length direction of the pair of bearing cross beams;

The two ends of the longitudinal girder are respectively and correspondingly arranged on the pair of transverse crown blocks;

Wherein, hoisting mechanism sets up on the longitudinal girder.

8. The construction method for dismantling and rebuilding a bridge superstructure across an electrified railway according to claim 4, further comprising a transfer trolley provided at a free end of the lifting mechanism for loading the monolithic beams, the bottom of the transfer trolley being provided with freely rolling travelling wheels.