CN111705682A - A construction method and equipment for demolition and reconstruction of superstructure of widened bridge across electrified railway - Google Patents

Abstract

The invention discloses a construction method and equipment for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway, and the widened bridge across an electrified railway is an original bridge with left width and right width, comprising the following steps: S1, in A bridge segment is constructed on the outside of the right side of the original bridge; S2, the traffic of the left side of the original bridge is guided to the right side of the original bridge in the step S1, and the left side of the original bridge is dismantled. ; S3, carry out reconstruction at the original site of the left side of the original bridge; S4, guide the traffic of the right side of the former bridge in the step S2 to the new left side of the former bridge described in the step S3; S5, Demolish the right side of the original bridge, and build a new bridge at the original site where the right side of the original bridge was removed; S6, splicing and splicing the constructed bridge segments laterally in the direction of the newly-built bridge. The invention has the technical effects of stable structure and excellent construction procedures, and can be widely used in the technical field of building construction.

Description

A construction method for demolition and reconstruction of superstructure of widened bridge across electrified railway and its equipment

technical field

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

Background technique

Over the past few years, my country's expressway construction has achieved rapid development, which has played an important basic guarantee role for the rapid development of the national economy. However, with the rapid development of my country's economy and society, some early-constructed expressways, especially some four-lane expressways, are in a situation of saturated traffic volume and very tight transportation capacity. Road traffic capacity and service level are reduced, and safety accidents are gradually increasing. , can not well meet the needs of economic and social development and urban and rural construction, highway reconstruction and expansion has become an important and urgent task in my country's transportation infrastructure construction. The implementation of the expressway reconstruction and expansion project will inevitably interfere with the existing traffic flow, especially the demolition and reconstruction of bridges across existing railways. It is necessary to complete the demolition, slag transportation and protection of bridges in the shortest time and within a limited working face. , New, etc. In addition, in the 1990s, the state began to electrify the original railway, adding a catenary on the upper part of the railway. The catenary voltage is 10-500kV. The upper-span bridge built under the original construction limit standard conditions, due to the electrification of the lower railway. The distance between the catenary and the bottom of the bridge beam is relatively close. In addition, due to the saturation of the upper-span railway traffic and the impending service life of the structure, it is urgent to rebuild and widen the bridge after demolition; and most of the bridge widening construction must be carried out under the condition of ensuring the passage. Since the railway business line is the main artery of national transportation, the construction of the business line will affect the normal operation of the business line, and the traditional construction equipment and methods are not suitable for this type of construction;

For the dismantling and widening and reconstruction of the electrified railway bridge on the upper span, because the upper span bridge built under the previous construction limit standard after the electrification of the railway has a small distance between the catenary and the bottom of the beam, it is impossible to add protective measures during the construction of the business line; The use of traditional construction equipment and methods cannot meet the requirements of construction period and security. In addition, the complex process requires more skylight points for the business line to cooperate with the construction, which is not conducive to the control of construction costs.

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 with stable structure and excellent construction procedures.

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

S1, build a bridge segment on the outside of the right side of the original bridge;

S2, guiding the traffic of the left side of the original bridge to the right side of the original bridge in the step S1, and removing the left side of the original bridge;

S3, rebuilding the original site of the left frame of the original bridge removed in the step S2 to form a new left frame of the original bridge;

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

S5, demolish the right frame of the original bridge, and build a new bridge at the original site where the right frame of the original bridge was demolished;

S6, splicing and splicing the bridge segment constructed in the step S1 laterally towards the direction of the new bridge in the step S5 to form a new right width of the original bridge;

Wherein, the new left frame of the original bridge in the step S4 and the new right frame of the original bridge in the step S6 form a new bridge.

Preferably, the removal of the left frame of the original bridge in the step S2 and the removal of the right frame of the original bridge in the step S5 include:

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

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

SS1, drill holes at intervals along the length direction of the midline of each adjacent two girder slabs to form the deck of the original bridge with several rows of circular holes;

S2, cutting the segments between the adjacent drill holes between the two girder plates of the original bridge until the segments between the adjacent drill holes between all the adjacent girder plates of the original bridge are cut After that, several independent monolithic beams are formed;

S3, install and dismantle equipment, and dismantle and move all the single-piece beams in the step S2.

Preferably, when any one of the left and right sides of the original bridge undergoes the dismantling process, the other bridge deck is set as a business 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, and the beam dismantling machine spans the left and right sides of the original bridge and is arranged in the original directly above the bridge, for the removal of all monolithic beams of the superstructure of the original bridge;

The beam dismantling machine includes a load-bearing frame that supports and is arranged on the deck of the original bridge;

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

A hoisting mechanism, which can be freely slidably suspended on the bottom of the cantilever of the supporting beam along the length direction of the supporting beam, is used for hoisting all the single-piece beams.

Preferably, the load-bearing frame includes:

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

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

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

A plurality of adjustable fulcrum devices, all the adjustable fulcrum devices are respectively disposed directly below all the load-bearing legs, for adjusting the height of the load-bearing legs.

Preferably, all of said load-bearing legs comprise,

A pair of split legs, the upper part of which is close together and the lower part is separated, and a plurality of connecting beams are also arranged between the pair of split legs.

Preferably, the support sliding device comprises,

A pair of transverse 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;

the longitudinal beams, the two ends of which are respectively arranged on a pair of the traverse 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 used for loading the single-piece beam, and the bottom of the transfer trolley is provided with freely rolling walking wheels.

The present invention includes at least the following beneficial effects:

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

(2) The beams and slabs are moved to another bridge deck for removal, and the bridge is used as the protection platform for the business line, which prevents the erection of another platform.

(3) Six construction steps are adopted for the demolition of the original bridge and the new widening construction, which can ensure that the traffic of the construction section will not be affected during the construction period.

(4) Beam dismantling machine, stable structure, rigid support frame, load-bearing beams across the left and right beams, and traverse cranes set on the beams.

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

Other advantages, objects, and features of the present invention will appear in part from the description that follows, and in part will be appreciated by those skilled in the art from the study and practice of the invention.

Description of drawings

Fig. 1 is the structural representation of the cross-sectional direction of building a new bridge segment of the present invention;

Fig. 2 is the structural schematic diagram of the longitudinal section direction of the new bridge segment constructed by the present invention;

Fig. 3 is the structural representation of the longitudinal section direction of the beam dismantling machine of the present invention;

Fig. 4 is the structural representation of the cross-sectional direction of the beam dismantling machine of the present invention;

FIG. 5 is a schematic structural diagram of the monolithic beam of the present invention.

Description of reference numerals in the manual: 1. Steel beam assembly platform, 2. Single-piece beam, 3. Pushing buttress, 4. Protection and operation platform, 5. Track beam, 6. Pushing and anti-excursion device, 7. Elevation Adjusting block, 8, guide beam, 9, traction jack, 10, traction rope, 11, load-bearing outrigger, 12, adjustable fulcrum device, 13, load-bearing beam, 14, traverse crane, 15, hoisting mechanism, 16 , Longitudinal beam, 17, Bearing support beam, 18, Transfer trolley, 201, Round hole, 202, Cut seam. .

Detailed ways

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

In the description of the present invention, the terms "horizontal", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientation or positional relationship indicated by "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, and is not indicated or implied. The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

As shown in Figure 1-5, a construction method for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway, where the widened bridge across an electrified railway is an original bridge with left and right widths, including the following steps:

S1, build a bridge segment on the outside of the right side of the original bridge;

S2, guiding the traffic of the left side of the original bridge to the right side of the original bridge in the step S1, and removing the left side of the original bridge;

S3, rebuilding the original site of the left frame of the original bridge removed in the step S2 to form a new left frame of the original bridge;

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

S5, demolish the right frame of the original bridge, and build a new bridge at the original site where the right frame of the original bridge was demolished;

S6, splicing and splicing the bridge segment constructed in the step S1 laterally towards the direction of the new bridge in the step S5 to form a new right width of the original bridge;

Wherein, the new left frame of the original bridge in the step S4 and the new right frame of the original bridge in the step S6 form a new bridge.

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

In the new construction of the right and left sides of the new bridge, the pile foundation and the lower structure are constructed separately. Among them, the upper structure is in the form of steel box girder, and the jacking method is used for construction, and a steel girder assembly platform is erected. 1. Push the support pier 3, the protection and operation platform 4, install the track beam 5 on the top of the push platform, push the anti-excursion device 6 and the elevation adjustment block 7, assemble the steel box girder and the guide beam 8, and complete the part of the segment steel box girder. A traction jack 9 and a traction rope 10 are installed on one side of the jacking pier 3 to carry out the jacking construction. During the process, the deflection prevention device 6 is used to prevent the steel beam from shifting. Beam 8 falls on one side thrust pier 3, stop dragging, start to install the back segment steel beam, and repeat the above steps until the steel beam is dragged to the design position;

In the dismantling of the left and right sides of the original bridge, the constraints between the beams and slabs are first removed: first, use a water mill drill to drill along the center line of the adjacent beams and slabs to form several rows of circular holes 201, and then cut through the wire saws in the adjacent holes. , form several rows of slits 202, completely release the constraints of the beam and plate, and form an independent single-piece beam 2; install the beam dismantling machine on the left and right old bridge decks, first install the adjustable fulcrum device 12, and then install the load-bearing outriggers 11, Then install the load-bearing beam 13, and then install the load-bearing support beam 17 to form a stable load-bearing frame; outside the construction area, pre-assemble the traverse crane 14, the hoisting mechanism 15, and the longitudinal beam 16 to form the traverse crane, using The hoisting equipment hoists the traverse crane on the weighing frame, and drops the hoisting mechanism 15 on the load-bearing beam 13. The above steps constitute a beam dismantling machine, and the beam dismantling machine is tested and accepted. The hoisting crane traverses to the top of the single-piece beam 2 to be removed on the left old bridge, lifts the single-piece beam 2 through the hoisting mechanism 15, the hoisting crane traverses to the right old bridge, and lowers the single-piece beam 2 to On the transfer trolley 18 parked on the old bridge on the right, it is transported to the designated site by the transfer trolley 18; all the single-piece beams 2 of the old bridge on the left are removed in this order, and then the beam dismantling machine on the old bridge on the left is removed, and the right The beam dismantling machine on the side old bridge. The lower structure of the old bridge on the right was demolished by conventional explosion-free technology.

In another technical solution, the removal of the left frame of the original bridge in the step S2 and the removal of the right frame of the original bridge in the step S5 include:

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

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

SS1, drill holes at intervals along the length direction of the midline of each adjacent two girder plates to form the deck of the original bridge with several rows of circular holes 201;

S2, cutting the segments between the adjacent drill holes between the two girder plates of the original bridge until the segments between the adjacent drill holes between all the adjacent girder plates of the original bridge are cut After that, several independent monolithic beams 2 are formed;

S3, install and dismantle equipment, and dismantle and move all the single-piece beams 2 in the step S2.

In another technical solution, when any one of the left and right panels of the original bridge undergoes the dismantling process, the other bridge deck is set as a business line protection platform and a transportation channel.

The present invention is a device for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway. The dismantling device is a girder dismantling machine. The girder dismantling machine spans the left and right widths of the original bridge and is arranged on the original bridge. Right above, all monolithic beams 2 of the superstructure of the original bridge are dismantled;

The beam dismantling machine includes a load-bearing frame that supports and is arranged on the deck of the original bridge;

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

A hoisting mechanism 15 , which can be freely slidably suspended from the bottom of the cantilever of the supporting beam along the length direction of the supporting beam, is used for hoisting all the single-piece beams 2 .

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

Several pairs of load-bearing legs 11 are arranged at equal distances along the transverse section direction of the original bridge, and each pair of the load-bearing legs 11 is located at the same longitudinal water surface section position on the original bridge;

A pair of load-bearing beams 13, which are respectively erected on the top of all the load-bearing legs 11 located in the same transverse section direction;

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

A plurality of adjustable fulcrum devices 12 , all of which are correspondingly disposed 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 beam 13 is installed, and then the load-bearing support beam 17 is installed to form a stable load-bearing frame.

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

A pair of split legs, the upper part of which is close together and the lower part is separated, and a plurality of connecting beams are also arranged between the pair of split legs.

In the above technical solution, a pair of split legs forms 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 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;

the longitudinal beams 16, the two ends of which are respectively arranged on a pair of the traverse cranes 14;

Wherein, the lifting mechanism 15 is arranged on the longitudinal beam 16 .

In the above technical solution, the traverse crane 14, the hoisting mechanism 15, and the longitudinal beam 16 are pre-assembled outside the construction area to form the traverse crane, and the traverse crane is hoisted to the weighing machine by using hoisting equipment On the frame, the hoisting mechanism 15 is dropped 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 used to load the single-piece beam 2, and the bottom of the transfer trolley 18 is provided with a freely rolling of walking wheels.

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

Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (9)

1. a construction method for dismantling and rebuilding a bridge superstructure across electrified railway widening, described cross electrified railway widening bridge is the original bridge with left width and right width, it is characterized in that, may further comprise the steps: S1, build a bridge segment on the outside of the right side of the original bridge; S2, guiding the traffic of the left side of the original bridge to the right side of the original bridge in the step S1, and removing the left side of the original bridge; S3, rebuilding the original site of the left frame of the original bridge removed in the step S2 to form a new left frame of the original bridge; S4, guiding the traffic directed to the right frame of the original bridge in the step S2 to the new left frame of the original bridge in the step S3; S5, demolish the right frame of the original bridge, and build a new bridge at the original site where the right frame of the original bridge was demolished; S6, splicing and splicing the bridge segment constructed in the step S1 laterally towards the direction of the new bridge in the step S5 to form a new right width of the original bridge; Wherein, the new left frame of the original bridge in the step S4 and the new right frame of the original bridge in the step S6 form a new bridge. 2. The construction method for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway according to claim 1, wherein in the step S2, the left side of the original bridge is dismantled and in the step S5 The right panels of the original bridge include: The constraints between the beams and slabs of the original bridge are released and divided into small modules. 3. The construction method for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway according to claim 2, wherein the lifting of the constraints between the beams and slabs of the original bridge comprises the following steps: SS1, drill holes at intervals along the length direction of the midline of each adjacent two girder slabs to form the deck of the original bridge with several rows of circular holes; S2, cutting the segments between the adjacent drill holes between the two girder plates of the original bridge until the segments between the adjacent drill holes between all the adjacent girder plates of the original bridge are cut After that, several independent monolithic beams are formed; S3, install and dismantle equipment, and dismantle and move all the single-piece beams in the step S2. 4. The construction method for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway according to claim 1 or 2, characterized in that, when any one of the bridge decks of the left and right sides of the original bridge undergoes a dismantling process , and the other bridge deck is set as a business line protection platform and a transportation channel. 5. The equipment for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway according to any one of claims 1-4, wherein the dismantling equipment is a beam dismantling machine, and the beam dismantling machine spans The left and right sides of the original bridge are arranged just above the original bridge, and are used for dismantling all the single-piece beams of the upper structure of the original bridge; The beam dismantling machine includes a load-bearing frame that supports and is arranged on the deck of the original bridge; a supporting sliding device, which is supported and arranged on the load-bearing frame to form a cantilever; A hoisting mechanism, which can be freely slidably suspended on the bottom of the cantilever of the supporting beam along the length direction of the supporting beam, is used for hoisting all the single-piece beams. 6. The equipment for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway according to claim 5, wherein the load-bearing frame comprises: A plurality of pairs of load-bearing legs are arranged at equal distances along the transverse section direction of the original bridge, and each pair of the load-bearing legs is located at the same longitudinal water surface section position on the original bridge; a pair of load-bearing beams, which are respectively erected directly above all the load-bearing legs located in the same transverse section direction; a plurality of load-bearing support beams, which are respectively arranged between each pair of load-bearing support legs located in the same longitudinal section; A plurality of adjustable fulcrum devices, all the adjustable fulcrum devices are respectively disposed directly below all the load-bearing legs, for adjusting the height of the load-bearing legs. 7. The equipment for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway according to claim 6, wherein all the load-bearing outriggers comprise: The upper part of the pair of split legs is close together and the lower part is separated, and a plurality of connecting beams are also arranged between the pair of split legs. 8. The equipment for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway according to claim 5 or 6, wherein the supporting sliding device comprises: A pair of transverse 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; the longitudinal beams, the two ends of which are respectively arranged on a pair of the traverse cranes; Wherein, the lifting mechanism is arranged on the longitudinal beam. 9. The device for dismantling and rebuilding the superstructure of a widened bridge across an electrified railway according to claim 5 or 6, characterized in that it further comprises a transfer trolley, which is arranged at the free end of the hoisting mechanism and is used for loading The single-piece beam and the bottom of the transfer trolley are provided with freely rolling walking wheels.

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