CN111270618A - Bridge reconstruction construction method based on half-width traffic protection - Google Patents
Bridge reconstruction construction method based on half-width traffic protection Download PDFInfo
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- CN111270618A CN111270618A CN202010122183.XA CN202010122183A CN111270618A CN 111270618 A CN111270618 A CN 111270618A CN 202010122183 A CN202010122183 A CN 202010122183A CN 111270618 A CN111270618 A CN 111270618A
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- 238000010276 construction Methods 0.000 title claims abstract description 91
- 238000002955 isolation Methods 0.000 claims abstract description 83
- 238000004891 communication Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 13
- 239000006185 dispersion Substances 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 7
- 239000010410 layer Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims 1
- 230000008569 process Effects 0.000 description 6
- 239000002893 slag Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000007306 turnover Effects 0.000 description 2
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- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003370 grooming effect Effects 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Abstract
The invention discloses a bridge reconstruction construction method based on half-width traffic protection, which comprises the following steps: isolating the bridge to be disassembled through an isolation facility to form a first isolation bridge floor and a communication protection bridge floor; sequentially removing the bridge deck facilities of the first isolation bridge deck, crushing and transporting away; completing the pouring construction of the single newly-built bridge pile foundation and the lower structure; moving the isolation facility towards the direction of the access protection bridge floor, and isolating the bridge to be detached to form a second isolation bridge floor and an access protection bridge floor; sequentially dismantling the bridge deck facilities of the second isolation bridge deck, crushing and transporting away; completing the pouring of the single newly-built bridge capping beam and the abutment, the beam plate hoisting and the construction of a bridge deck facility; and opening the traffic of the single newly-built bridge after the bridge head of the single newly-built bridge is connected with the following road, and repeating the steps to realize the dismantling construction of the rest bridges to be dismantled and another single newly-built bridge. The invention can meet the comprehensive requirements on construction efficiency, driving safety and traffic flow during bridge reconstruction.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a bridge reconstruction construction method based on half-width maintenance.
Background
Along with the needs of economic development, most of the original highway bridges cannot meet the increasingly developed needs, if the bridges need to be reinforced or widened, the bridges are reconstructed into the development trend of traffic engineering, traffic passage must be considered in the construction of newly-built bridges, if newly-repaired pass-through roads or pass-through steel trestles are adopted and then the original bridges are integrally removed and then newly built, the construction mode wastes a large amount of manpower and material resources, the construction period is prolonged, and the construction cost is increased.
Disclosure of Invention
The invention provides a bridge reconstruction construction method based on half-width traffic protection, and aims to solve the technical problems that the influence on traffic volume is large and traffic safety is difficult to guarantee when the existing bridge is improved.
The technical scheme adopted by the invention is as follows:
a bridge reconstruction construction method based on half-width protection and communication comprises the following steps:
the bridge to be disassembled is isolated along the travelling direction through an isolation facility to form a first isolation bridge floor and a pass-through bridge floor, wherein the width of the first isolation bridge floor is set to be the minimum transverse operation width which only needs to meet the single newly-built bridge pile foundation and the lower structure construction;
sequentially dismantling the bridge deck facilities of the first isolation bridge deck, crushing and transporting away;
completing the pouring construction of the single newly-built bridge pile foundation and the lower structure;
moving the isolation facility to the direction of the access bridge floor, and isolating the bridge beam to be detached along the travelling direction to form a second isolation bridge floor and the access bridge floor, wherein the width of the second isolation bridge floor is set to be the minimum transverse operation width which only needs to meet the construction of a single newly-built bridge capping beam and a bridge abutment;
sequentially dismantling the bridge deck facilities of the second isolation bridge deck, crushing and transporting away;
completing the pouring of the single newly-built bridge capping beam and the abutment, the beam plate hoisting and the construction of a bridge deck facility;
and opening the traffic of the single newly-built bridge after the bridge head of the single newly-built bridge is connected with the following road, and repeating the steps to realize the dismantling construction of the rest bridges to be dismantled and another single newly-built bridge.
Further, treat through isolation facility and treat that the bridge girder of tearing open carries out the isolation along the driving direction and forms first isolation bridge floor and protect and lead to the bridge floor before, still include the step:
and arranging temporary traffic dispersion facilities at corresponding positions of roads and bridges according to traffic dispersion requirements of vehicle traffic.
Further, the setting of temporary traffic dispersion facilities at corresponding positions of roads and bridges according to traffic dispersion requirements for vehicle traffic specifically includes:
deceleration strips are respectively arranged at two ends of the bridgehead according to a plurality of preset intervals, wherein the preset intervals comprise 20m, 50m, 100m, 200m and 300 m;
traffic signboards and construction informing boards are arranged at 2000-3000 m positions of two ends of the bridge, guidance is arranged at 500m positions away from a construction area, and corresponding safety signboards and signboards are arranged at 500m, 400m, 300m, 200m, 100m and 50m positions respectively.
Further, treat through isolation facility and treat that the bridge girder of tearing open is carried out the isolation along the driving direction and is formed first isolation bridge floor and protect and lead to after the bridge floor, before the bridge floor leads to the car, still include the step:
and evaluating the safety of the bridge beam to be disassembled in a grade, and if the evaluation grade is lower than a threshold value, paving a steel plate on the through-protecting bridge floor of the bridge beam to be disassembled.
Furthermore, the isolation facility comprises a permeable fence, an anti-collision pier and a hard enclosure in sequence along the direction of the access bridge floor pointing to the first isolation bridge floor, and the two ends of the isolation facility are provided with transition sections for traffic guidance.
Furthermore, the gradual change section is provided with the crashproof cask in the one side towards protecting the bridge floor and implements the isolation to put construction warning sign, electronic facilities at night and light guide vehicle and travel.
Further, the method also comprises the following steps of sequentially dismantling the bridge surface facilities in the first isolation bridge surface and crushing and transporting away:
constructing a plurality of hoisting platforms at intervals along the length direction on the isolation side of the bridge to be dismantled, wherein each hoisting platform is over against the joint of two adjacent bridge plates of the bridge to be dismantled, so that a crane can hoist the two adjacent bridge plates;
and constructing a construction access to communicate with each hoisting platform.
Further, demolish the bridge floor facility in the first isolation bridge face in proper order and broken the concrete including of carrying away:
crushing, dismantling and connecting metal cutting the bridge deck facilities in the first isolation bridge face;
and hoisting the beam plates in the first isolation bridge face from one end of the bridge to the other end of the bridge in sequence by using a crane to a crushing position for crushing and carrying away.
Further, crushing, dismantling and connecting metal cutting the bridge deck facility in the first isolation bridge deck specifically comprises:
breaking the bridge deck pavement layer and cutting off the surface layer reinforcing mesh pieces;
dismantling the adjacent side guard rail and the sidewalk;
breaking the wet seam or hinge joint;
the concrete of the beam slab middle cross beam, the transverse partition plate and the end cross beam are broken, and the connecting steel bars and the steel plates are cut off, wherein 2-4 steel bars are reserved before the beam slab is hoisted and are effectively connected, and one connecting steel bar is reserved at the wet joint or hinge joint every 3-4 m.
Furthermore, when hoisting, the beam plate to be dismantled is bound by using the steel wire rope, and the corresponding connecting steel bars are cut off under the condition that the crane acts and the steel wire rope has force, so that the beam plate to be dismantled is completely separated.
The invention has the following beneficial effects:
the bridge reconstruction construction method provided by the invention adopts a mode of gradually isolating and dismantling the bridge to be dismantled and a new bridge, does not dismantle all bridge deck facilities and beam plates of a half-width bridge to be dismantled at one time, but gradually isolates and dismantles the bridge to be dismantled according to the construction requirement of the new bridge, ensures the smooth construction of the new bridge, and simultaneously ensures the traffic width of the bridge to be dismantled by gradually isolating and dismantling the bridge to be dismantled, does not influence the traffic capacity as much as possible to cause possible congestion, does not influence the traffic safety of the bridge to be dismantled due to the fact that too many bridge deck facilities and beam plates of the bridge to be dismantled are dismantled at one time in the construction of the new bridge, and meets the comprehensive requirements of construction efficiency, traffic safety and traffic flow during bridge reconstruction.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic plan view of a bridge to be disassembled for traffic dispersion and isolation;
FIG. 2 is a schematic plan view of a position relationship between a bridge to be dismantled and a newly-built bridge;
FIG. 3 is a schematic cross-sectional view of a bridge to be disassembled after first isolation;
FIG. 4 is a schematic overall plan view of the first isolated deck prior to removal of the beam slab;
FIG. 5 is a schematic overall plan view of a first process for hoisting a beam slab of the first isolated deck;
FIG. 6 is a schematic overall plan view of a second process for hoisting a beam slab of the first isolated deck;
FIG. 7 is an overall plan view of a third process for hoisting a beam slab of the first isolated deck;
FIG. 8 is an overall plan view of the fourth process for hoisting the beam slab of the first isolated deck;
FIG. 9 is a schematic overall plan view of the first isolated deck after the beam slab is hoisted;
FIG. 10 is a schematic cross-sectional view of the beam slab of the first isolated deck after the beam slab is completely hoisted;
description of reference numerals: 1. anti-collision piers; 2. a transparent fence; 3. a hard enclosure; 4. a guardrail; 5. a sidewalk board; 6. the middle clapboard is connected with a steel plate; 7. a beam plate; 8. the hinge joint on the upper layer of the beam plate is connected with a steel plate; 9. an anti-collision bucket; 10. temporary traffic grooming facilities; 11. a bridge side line to be dismantled; 13. hoisting the platform; 14. a crane; 15. constructing a sidewalk; 16. a drainage culvert pipe; 17. left and right separator strips of the new bridge; 18. a new bridge centerline; 19. a central line of the bridge to be disassembled; 20. the left width of the new bridge; 21. a bridge pile position is to be disassembled; 22. a new bridge pile position; 23. and (5) the right frame of the new bridge.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A certain bridge is a single river-crossing bridge, and is provided with four bridge plates 7 in total, the width of a bridge deck through which traffic passes is 14m, as the construction time is long, no matter the maximum load capacity or the bridge width can not meet the current increasing traffic passing requirements, a new bridge needs to be constructed at the position of a bridge to be disassembled to meet the current traffic passing requirements, the new bridge consists of a left new bridge width 20 and a right new bridge width 23, the design widths are 12m respectively, a left new bridge width partition belt 17 and a right new bridge width partition belt 17 with certain widths are arranged in the middle, as shown in figures 1 and 2, a central line 18 of the new bridge is deviated by 2.5m compared with a central line 19 of the bridge to be disassembled, each row of pile bases of the bridge to be disassembled is provided with three pile positions 21 of the bridge to be disassembled, and each row of pile bases of the new bridge is provided with four pile positions 22. In terms of width, the left side line of the new bridge is aligned with the left side line of the bridge to be disassembled, and the right side line of the new bridge is far beyond the side line 11 of the bridge to be disassembled, so that the new bridge has better load capacity and traffic width than the bridge to be disassembled.
According to a half-width passing half-width construction scheme and the changed drawing conditions, firstly, the river is cut off and sealed, the bridge plan firstly removes part of beam plates 7 influencing piling, and after the half-width pile foundation and the lower structure of the new bridge are constructed, the beam plates 7 of the rest bridges to be removed in a half-width range are removed, so that the requirement on the plane position size of the single newly-built bridge is met, and edge protection measures, corresponding safety warning signboards, half-width traffic protection and dredging facilities and personnel configuration are made. When the pile foundation and the lower structure are constructed in the early stage, the requirement of ensuring the width of the passage surface is required under the condition of not influencing the construction of a new bridge.
A bridge reconstruction construction method based on half-width protection and communication comprises the following steps:
s1, isolating the bridge to be disassembled through an isolation facility along the travelling direction to form a first isolation bridge floor and a pass-through bridge floor, wherein the width of the first isolation bridge floor is set to be the minimum transverse operation width only meeting the construction of the pile foundation and the lower structure of the right side 23 of the new bridge, and the minimum transverse operation width of the construction of the pile foundation and the lower structure of the right side 23 of the new bridge can be met only by disassembling two outermost beam plates 7 in the first isolation bridge floor in the embodiment;
s2, sequentially dismantling the bridge deck facilities of the first isolation bridge deck, crushing and transporting away;
s3, finishing the pouring construction of the pile foundation and the lower structure of the right side 23 of the new bridge;
s4, moving the isolation facility to the direction of the access protection bridge floor, and isolating the bridge beam to be detached along the travelling direction to form a second isolation bridge floor and the access protection bridge floor, wherein the width of the second isolation bridge floor is set to be the minimum transverse operation width which only needs to meet the construction of the cover beam and the bridge abutment of the right side 23 of the new bridge;
s5, sequentially dismantling the bridge deck facilities of the second isolation bridge deck, crushing and transporting away;
s6, completing pouring of a capping beam and an abutment of the right side 23 of the new bridge, hoisting of the beam plate 7 and construction of a bridge deck facility;
and S7, opening the traffic of the right frame 23 of the new bridge after the bridge head of the right frame 23 of the new bridge is connected with the road, and repeating the steps to realize the dismantling construction of the rest bridges to be dismantled and the left frame 20 of the new bridge.
Wherein, in order to guarantee the security of bridge reconstruction construction and driving, need carry out corresponding traffic before the construction and dredge, treat promptly through isolation facilities and wait to tear open the bridge roof beam along driving direction implement keep apart form first keep apart the bridge floor and protect and lead to the bridge floor before, still include the step:
the method for setting temporary traffic dispersion facilities 10 at corresponding positions of roads and bridges according to traffic dispersion requirements of vehicle traffic comprises the following steps:
deceleration strips are respectively arranged at two ends of the bridgehead according to a plurality of preset intervals, wherein the preset intervals comprise 20m, 50m, 100m, 200m and 300 m;
traffic signboards and construction informing boards are arranged at 3000m positions at two ends of the bridge, guidance is arranged at a position 500m away from a construction area, and corresponding safety signboards and signboards are arranged at 500m, 400m, 300m, 200m, 100m and 50m respectively.
The temporary traffic evacuation facility 10 can effectively guide and indicate vehicles coming and going, ensure the safety and the order of traffic, and provide necessary safety guarantee for bridge reconstruction construction.
In a preferred embodiment, after the bridge girder to be detached is isolated by the isolation facility along the traveling direction to form a first isolation bridge deck and a pass-through bridge deck and before the pass-through bridge deck passes through the vehicle, the method further comprises the following steps:
and carrying out grade evaluation on the safety of the bridge beam to be disassembled, and if the evaluation grade is lower than a threshold value, paving a 2cm steel plate on the pass-through protection bridge surface of the bridge beam to be disassembled so as to improve the integral strength of the bridge beam to be disassembled and the passing capacity of the bridge beam to be disassembled. The evaluation can comprehensively evaluate the safety of the bridge by means of an appearance detection method, a nondestructive detection method, a bridge dynamic and static load test method, an expert system and the like.
In a preferred embodiment, the isolation facility sequentially comprises a through fence 2, an anti-collision pier 1 and a hard enclosure 3 along the direction of the access bridge surface pointing to the first access bridge surface, the height of the hard enclosure 3 is 2m, the size of the anti-collision pier 1 is 1m 03m 1.2m, and the two ends of the isolation facility are provided with gradual change sections for traffic guidance.
In a preferred embodiment, in order to further ensure the construction and driving safety, two layers of large anti-collision buckets 9 are arranged on one side of the transition section facing the access bridge floor for isolation, and construction warning signs, night electronic facilities and illuminating lamps are arranged to guide the vehicle to run, so that the safety protection of personnel in the construction area is enhanced.
In a preferred embodiment, before the sequentially removing the bridge deck facilities in the first isolation bridge deck and crushing for transportation, the method further comprises the following steps:
two hoisting platforms 13 are built at intervals along the length direction on the isolation side of the bridge to be dismantled, and meanwhile, each hoisting platform 13 is over against the joint of two adjacent span beam plates 7 of the bridge to be dismantled, namely, the hoisting platforms are respectively built between a first span and a second span and between a third span and a fourth span, so that a crane 14 is ensured to hoist the two adjacent span beam plates 7; the size of the hoisting platform 13 is 15m by 15m, and the replacement and filling depth is 3.5m (determined according to the bearing capacity of the foundation on site); the hoisting platform 13 is constructed by replacing and filling rubbles, and then 50cm of coarse slag is paved;
the construction temporary walkway 15 is built on the isolation side of the bridge to be dismantled along the length direction, a transverse temporary walkway is connected and arranged between the construction temporary walkway 15 and each hoisting platform 13, a crane 14 can conveniently drive into the corresponding hoisting platform 13 from the construction temporary walkway 15 for hoisting operation, and in addition, the construction temporary walkway 15 is also provided with a drainage culvert pipe 16 for facilitating the passage of water flow under the bridge.
In a preferred embodiment, the sequentially removing the bridge deck facilities in the first isolation bridge deck and crushing and transporting away specifically comprises:
crushing, dismantling and connecting metal cutting the bridge deck facilities in the first isolation bridge face;
as shown in fig. 4, two 160T cranes 14 are arranged according to the weight of the components and the site machinery station, the two beam plates 7 in the first isolation bridge surface are sequentially hoisted to the crushing position from one end of the bridge to the other end by the cranes 14 to be broken and carried away, wherein, as shown in fig. 5 to 10, the two cranes 14 sequentially hoist the two beam plates 7 closest to the cranes 14 in each span to the crushing position of the construction access 15 from the first span to the fourth span to be broken and carried away, and are sequentially dismantled from one end, so that the utilization rate of the two beam plates on each platform can be fully utilized, the turnover frequency of the cranes is reduced, and the work efficiency is improved. And (4) dismantling 8 beam plates in total at four spans in one period, and finishing in about 4 hours in one morning. The counter weight needs to be installed to large-scale crane, and the turnover volume of consuming time is great, breaks one gap through the expansion joint from one end, can make the beam slab demolish enough activity space when lifting by crane, is unlikely to the beam slab card (be superior to and stride from the centre and demolish).
As can be seen from fig. 1 and 2, after two beam plates 7 in each span in the first isolation bridge surface are removed, there is enough space for constructing each pile foundation and lower structure of the right side 23 of the new bridge, and the remaining bridge surface of the bridge to be removed does not interfere with the construction of each pile foundation and lower structure of the right side 23 of the new bridge, so as to make up a necessary transverse operation width for the construction of each pile foundation and lower structure of the new bridge.
After the construction of the piles and the substructure of the right side 23 of the new bridge is completed, the capping beam and the abutment of the right side 23 of the new bridge are poured, and the beam slab 7 is hoisted and the construction of the bridge deck facility is performed, and at this time, a larger construction width is required, so that, as described in step S4, the embodiment of the present invention performs the isolation of the bridge beam to be disassembled into the second isolated bridge deck and the secured bridge deck by moving the isolation facility in the direction of the secured bridge deck for a certain distance, and at this time, the width of the second isolated bridge deck is larger than the width of the previous first isolated bridge deck, and the width of the secured bridge deck is reduced, wherein the width of the second isolated bridge deck is set to satisfy only the minimum transverse operation width for the construction of the capping beam and the abutment of the right side 23 of the new bridge, and specifically, in this embodiment, the pouring of the capping beam slab and the bridge deck for the new right side 23 of the new bridge, and the construction of the beam, two beam plates 7 are required to be removed in each span in the second isolation bridge surface, the removal mode is similar to that of the two beam plates 7 in each span in the first isolation bridge surface, and the two beam plates 7 closest to the crane 14 in each span are sequentially hoisted to the broken part of the construction access 15 from the first span to the fourth span through two cranes 14 to be broken and then transported away through transportation equipment, so that the subsequent smooth construction of the right side 23 of the new bridge is ensured.
According to the characteristics of the new bridge construction in stages, when the right side 23 of the new bridge is built, the isolation area of the bridge to be dismantled is dismantled gradually twice, compared with the existing half-width construction mode, the construction efficiency of the new bridge is guaranteed, traffic flow and traffic safety can be guaranteed to the maximum extent, and risks are reduced.
In a preferred embodiment, the crushing, dismantling and connecting metal cutting of the deck facility in the first isolation bridge deck specifically comprises:
firstly, a small crusher (D60 type) or an air compressor is adopted to break a bridge deck pavement layer of a bridge to be dismantled and cut off a surface layer reinforcing mesh sheet;
then, dismantling the guardrail 4 and the sidewalk plate 5 which are adjacent to the edges;
then, the wet joints or hinge joints are broken, and the flange plate concrete of the beam plate 7 can be broken if necessary, so that the hoisting weight is reduced;
the concrete of the middle cross beam, the transverse partition plate and the end cross beam of the beam plate 7 is broken, the connecting steel bars, the middle partition plate connecting steel plate 6, the beam plate upper layer hinge joint connecting steel plate 8 and the like are cut off simultaneously, wherein the middle cross beam, the transverse partition plate and the end cross beam are kept for 2-4 steel bars to be effectively connected before the beam plate 7 is hoisted, the connecting steel bars are kept for wet joints or hinge joints every 3-4 m, the weight of a single beam plate 7 is about 12T after the beam plate is partially dismantled, and the weight of the steel bars is about 5T.
In a preferred embodiment, in order to ensure the hoisting safety, the crane 14 is subjected to safety inspection before hoisting, and meanwhile, the slag stones in the expansion joints at the beam ends and the slag stones of the bridge deck beam slab 7 are cleaned; when hoisting, the beam plate 7 to be dismantled is bound by the steel wire rope, and corresponding connecting steel bars are cut off under the conditions that the crane 14 acts and the steel wire rope has force, so that the beam plate 7 to be dismantled is completely separated, and the risk that the beam plate 7 is out of balance when collapsing due to inclination and falls rapidly under the action of gravity is avoided.
In step S7, opening the new bridge right panel 23 for traffic (passing acceptance of bridge and road) after the bridge end of the new bridge right panel 23 is constructed along the road, and then constructing the new bridge left panel 20, wherein the construction process is similar to the construction process of the new bridge right panel 23, and at this time, it is necessary to first perform chamfering and rearrangement of all traffic sign signs and isolation facilities; after the corresponding hoisting platform 13, the construction access way 15 and the transverse access way are built on the other side of the bridge to be dismantled, two 160T cranes 14 are adopted to hoist and dismantle the rest of the beam plates 7 to be dismantled, the 160T cranes 14, the excavators, the crushers and the beam transporting equipment enter a field for the second time, the rest of the bridge to be dismantled is dismantled, after the dismantling, the left side 20 of the new bridge is constructed, and after the construction is completed and the acceptance is qualified, the corresponding temporary traffic dredging facilities 10 can be dismantled to realize the comprehensive traffic of the new bridge.
In the construction method of the embodiment, only the beam plates 7 which influence pile driving are removed firstly, that is, only two beam plates 7 in the first isolation bridge face are removed from the new bridge at the beginning, so that pile driving construction of the new bridge can be ensured, the traffic width of the bridge to be removed is ensured, traffic flow capacity is influenced as little as possible, and the problem of congestion caused by narrow road surface width is avoided. Because can not demolish too much beam slab 7 once before new bridge half width pile foundation and lower structure construction, consequently the operation of demolising in earlier stage can not influence the overall structure safety and the driving safety of waiting to demolish the bridge, after having accomplished new bridge half width pile and pile body and having pour, progressively demolish beam slab 7 that the bridge was waited to demolish to the surplus of half width within range again to satisfy the needs of pouring of the bent cap part of newly-built bridge, realized the perfect adaptation of bridge transformation in-process efficiency of construction, low cost, fail safe nature.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A bridge reconstruction construction method based on half-width protection and communication is characterized by comprising the following steps:
the bridge to be disassembled is isolated along the travelling direction through an isolation facility to form a first isolation bridge floor and a pass-through bridge floor, wherein the width of the first isolation bridge floor is set to be the minimum transverse operation width which only needs to meet the single newly-built bridge pile foundation and the lower structure construction;
sequentially dismantling the bridge deck facilities of the first isolation bridge deck, crushing and transporting away;
completing the pouring construction of the single newly-built bridge pile foundation and the lower structure;
moving the isolation facility to the direction of the access bridge floor, and isolating the bridge beam to be detached along the travelling direction to form a second isolation bridge floor and the access bridge floor, wherein the width of the second isolation bridge floor is set to be the minimum transverse operation width which only needs to meet the construction of a single newly-built bridge capping beam and a bridge abutment;
sequentially dismantling the bridge deck facilities of the second isolation bridge deck, crushing and transporting away;
completing the pouring of the single newly-built bridge capping beam and the abutment, the beam plate hoisting and the construction of a bridge deck facility;
and opening the traffic of the single newly-built bridge after the bridge head of the single newly-built bridge is connected with the following road, and repeating the steps to realize the dismantling construction of the rest bridges to be dismantled and another single newly-built bridge.
2. The bridge rebuilding construction method based on half-range opening protection according to claim 1, wherein before the bridge beam to be dismantled is isolated along the driving direction by the isolation facility to form a first isolation bridge floor and an opening protection bridge floor, the method further comprises the following steps:
temporary traffic dispersion facilities (10) are arranged at corresponding positions of roads and bridges according to traffic dispersion requirements of vehicle traffic.
3. The bridge rebuilding construction method based on half-width traffic protection according to claim 2, wherein the setting of temporary traffic diversion facilities (10) at corresponding positions of roads and bridges according to traffic diversion requirements of vehicle traffic specifically comprises:
deceleration strips are respectively arranged at two ends of the bridgehead according to a plurality of preset intervals, wherein the preset intervals comprise 20m, 50m, 100m, 200m and 300 m;
traffic signboards and construction informing boards are arranged at 2000-3000 m positions of two ends of the bridge, guidance is arranged at 500m positions away from a construction area, and corresponding safety signboards and signboards are arranged at 500m, 400m, 300m, 200m, 100m and 50m positions respectively.
4. The bridge rebuilding construction method based on half-range traffic protection according to claim 1, wherein after the bridge beam to be dismantled is isolated along the driving direction by the isolation facility to form a first isolation bridge deck and a traffic protection bridge deck and before the traffic protection bridge deck is driven, the method further comprises the following steps:
and evaluating the safety of the bridge beam to be disassembled in a grade, and if the evaluation grade is lower than a threshold value, paving a steel plate on the through-protecting bridge floor of the bridge beam to be disassembled.
5. The bridge rebuilding construction method based on half-width fender-through according to claim 1, wherein the isolation facility comprises a permeable fence (2), an anti-collision pier (1) and a hard enclosure (3) in sequence along the direction of the fender-through bridge surface towards the first fender-through bridge surface, and the two ends of the isolation facility are provided with gradual change sections for traffic guidance.
6. The bridge rebuilding construction method based on half-width maintenance access according to claim 5, wherein the gradual change section is provided with an anti-collision water barrel (9) on one side facing the maintenance access bridge floor to implement isolation, and a construction warning sign board, night electronic facilities and an illuminating lamp are placed to guide the vehicle to run.
7. The bridge rebuilding construction method based on half-width protection and communication of claim 1, wherein before the sequentially dismantling the bridge deck facilities in the first isolation bridge face and crushing for transportation, further comprises:
a plurality of hoisting platforms (13) are built at intervals along the length direction on the isolation side of the bridge to be dismantled, and meanwhile, each hoisting platform (13) is over against the joint of two adjacent bridge plates (7) of the bridge to be dismantled, so that a crane (14) is ensured to hoist the two adjacent bridge plates (7);
and constructing a construction access way (15) to communicate with each hoisting platform (13).
8. The bridge reconstruction construction method based on half-width protection and communication according to claim 1, wherein the steps of sequentially dismantling the bridge deck facilities in the first isolation bridge deck and crushing and transporting away specifically comprise:
crushing, dismantling and connecting metal cutting the bridge deck facilities in the first isolation bridge face;
and hoisting the beam plates (7) in the first isolation bridge face to a crushing position from one end of the bridge to the other end of the bridge in sequence by using a crane (14) for crushing and transporting away.
9. The bridge reconstruction construction method based on half-width protection and penetration as claimed in claim 8, wherein the crushing, dismantling and connecting metal cutting of the bridge deck facilities in the first isolation bridge face specifically comprises:
breaking the bridge deck pavement layer and cutting off the surface layer reinforcing mesh pieces;
dismantling the adjacent side guard rail and the sidewalk;
breaking the wet seam or hinge joint;
the concrete of the middle cross beam, the transverse partition plate and the end cross beam of the beam slab (7) is broken, and the connecting steel bars and the steel plates are cut off at the same time, wherein 2-4 steel bars are reserved before the beam slab (7) is hoisted and are effectively connected, and one connecting steel bar is reserved at the wet joint or hinge joint every 3-4 m.
10. The bridge rebuilding construction method based on half-width protection and communication of claim 8, wherein when hoisting is carried out, the beam plate (7) to be dismantled is bound by using the steel wire rope, and under the condition that the crane (14) is operated and the steel wire rope is under force, the corresponding connecting steel bars are cut off, so that the beam plate (7) to be dismantled is completely separated.
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| CN114045758A (en) * | 2021-11-16 | 2022-02-15 | 广西路桥工程集团有限公司 | Construction method for dismantling old bridge of precast beam |
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