CN110273385B - Method for dismantling cross-line hole cross-concrete box girder - Google Patents
Method for dismantling cross-line hole cross-concrete box girder Download PDFInfo
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- CN110273385B CN110273385B CN201910267686.3A CN201910267686A CN110273385B CN 110273385 B CN110273385 B CN 110273385B CN 201910267686 A CN201910267686 A CN 201910267686A CN 110273385 B CN110273385 B CN 110273385B
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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
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Abstract
The invention discloses a method for dismantling a cross-line hole and a cross concrete box girder, which comprises the following steps: a protective shed frame is erected below the overline box girder; dismantling auxiliary facilities of the bridge deck; respectively cutting and dismantling the flange plates of the cross box girder from the middle to two ends of the bridge span; respectively cutting and dismantling a top plate and a bottom plate of the cross box girder from the middle to two ends of the bridge span; arranging a fastening anchor cable system for bearing the overline box girder; respectively cutting and dismantling a web plate of the cross-line box girder from the middle of the bridge span to two ends; demolish the anchor cable system of knot, accomplish the line hole and stride concrete box girder and demolish, relate to bridge construction technical field. The invention greatly reduces the difficulty of the construction of dismantling the concrete box girder across the line-crossing hole, improves the safety and the construction efficiency in the construction process, has little influence on the normal passing of the existing line under the bridge and has strong practicability.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a method for dismantling a cross-line hole and a cross concrete box girder.
Background
Along with the rapid increase of urban traffic volume and traffic axle load, the requirements on the traffic capacity and service level of the bridge are continuously improved, most of early concrete box bridges are difficult to meet the driving requirements under the conditions of large traffic volume and high load at present, and along with the appearance of structural defects and engineering diseases of the self panel of the concrete box bridge, the structural safety and normal traffic of the existing concrete box bridge are influenced, so that the box bridge needs to be dismantled comprehensively, and the bridge is dismantled mainly by a mechanical crushing method, a crane hoisting method and the like at present.
In cities, a plurality of overpass bridges comprise an overpass box girder (1) crossing a road or a railway and non-overpass box girders (2) positioned on two sides of the overpass box girder (1), and for the bridge, the bridge is dismantled by the two methods, so that the defects of low construction efficiency, high cost, difficult construction and the like exist, and meanwhile, a great safety risk also exists. Therefore, it is of great significance to research and provide a dismantling technical method for the concrete box girder across the line-crossing hole.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide the method for dismantling the cross-line hole cross concrete box girder, which is convenient to construct, high in efficiency and good in safety.
The invention provides a method for dismantling a cross-line hole and a cross concrete box girder, which comprises the following steps:
s1, building a protective shed frame below the cross box girder;
s2, dismantling auxiliary facilities of the bridge deck;
s3, cutting and dismantling the flange plates of the cross box girder from the middle to two ends of the bridge span respectively;
s4, respectively cutting and dismantling a top plate and a bottom plate of the cross box girder from the middle to two ends of the bridge span;
s5, arranging a fastening anchor cable system for bearing the overline box girder;
s6, respectively cutting and dismantling the web plate of the cross-line box girder from the middle of the bridge span to two ends;
s7, removing the anchor cable fastening system to finish the removal of the concrete box girder across the line-crossing hole.
On the basis of the above technical solution, in step S1, the protection shed frame is a strip-shaped basic shed frame.
On the basis of the above technical solution, in step S2, the auxiliary facilities include street lamps, monitoring, anti-throwing nets and a bridge deck protective layer on the bridge deck.
On the basis of the technical scheme, in step S3, the flange plate is cut and removed in blocks along the longitudinal bridge direction.
On the basis of the technical scheme, in step S4, the top plate and the bottom plate are cut and removed in blocks along the longitudinal bridge direction, and a concrete strip block is reserved between two adjacent blocks.
On the basis of the above technical solution, in step S5, the anchor cable fastening system includes an upright post disposed on the non-span box girder, and an anchor cable fastening cable having one end anchored to the top of the upright post and the other end anchored to the span box girder.
On the basis of the technical scheme, the anchor cable buckling system further comprises an anchor cable, wherein one end of the anchor cable is anchored at the top of the upright post, and the other end of the anchor cable is anchored at the non-span box girder.
On the basis of the technical scheme, the anchoring cables are anchored on the web plate of the cross-line box girder.
On the basis of the technical scheme, the anchor-buckling cable comprises a near-end cable with an anchoring point close to the end part of the cross-line box girder and a far-end cable with an anchoring point far away from the end part of the cross-line box girder.
Compared with the prior art, the invention has the following advantages:
according to the cross-line hole cross box girder dismantling method, after the cross-line box girder flange plate concrete block, the top plate concrete block and the bottom plate concrete block are divided, the cross-line box girder flange plate concrete block, the top plate concrete block and the bottom plate concrete block are sequentially cut and dismantled to form the frame structure, after the stability and safety of the cantilever end of the frame structure are ensured by arranging the buckle anchor cable system, the cross-line box girder web is respectively cut and dismantled from the bridge span to the two ends until the cross-line box girder is dismantled, the buckle anchor cable system is dismantled, the difficulty of cross-line hole cross concrete box girder dismantling construction is greatly reduced, the safety and the construction efficiency in the construction process are improved, the influence on the normal passing of existing lines under the bridge is small, and the practicability is high.
Drawings
FIG. 1 is a schematic view of a cross-line hole cross-concrete box beam cutting state according to an embodiment of the invention;
FIG. 2 is a cross-sectional view of a concrete box girder across a wire-crossing hole according to an embodiment of the present invention;
FIG. 3 is a schematic view of a cross-line hole cross concrete box beam buckle anchor cable system installation of an embodiment of the present invention;
fig. 4 is a schematic view of a cross-line hole of an embodiment of the invention after the distal cable of the cross-concrete box girder is removed.
Reference numerals: 1-overline box girder, 2-non-overline box girder, 3-flange plate, 4-top plate, 5-bottom plate, 6-anchor cable system, 61-upright column, 62-anchor cable, 621-near-end cable, 622-far-end cable, 63-anchor cable, 7-web plate, 8-concrete block.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 1 to 4, an embodiment of the present invention provides a method for removing a concrete box girder across a span hole, including the following steps:
s1, building a protective shed frame below the cross box girder 1;
in order to ensure the operation safety of the existing line below the bridge when the cross line box girder 1 is dismantled, a protective shed frame is erected below the cross line box girder 1, in the embodiment, the protective shed frame adopts a strip-shaped basic shed frame, steel pipe upright columns with the diameter of 500 multiplied by 8mm are arranged every 3m along the existing line direction, the cross beams of the shed frame adopt I20 type steel, and the erection range of the protective shed frame extends out of the flange plate 3 of the bridge along the transverse bridge direction by 5 m.
S2, dismantling auxiliary facilities of the bridge deck;
the auxiliary facilities comprise street lamps, monitoring and anti-throwing nets and bridge deck protective layers on the bridge deck, and after the street lamps, the monitoring and anti-throwing nets and other facilities on the bridge deck are dismantled in the construction process, the milling machine is used for milling and planing the bridge deck protective layers, so that the weight of the concrete box girder to be dismantled is reduced.
S3, cutting and dismantling the flange plates 3 of the cross box girder 1 from the middle to two ends of the bridge span respectively;
as shown in fig. 1, in the construction process, the flange plate 3 of the cross box girder 1 is cut and removed in blocks from the middle of the bridge span to two ends along the longitudinal bridge direction by using a rope saw, and in the embodiment, the flange plate 3 is cut, removed and hoisted in blocks every 1.5m along the longitudinal bridge direction from the middle of the bridge span.
S4, respectively cutting and dismantling the top plate 4 and the bottom plate 5 of the cross box girder 1 from the middle to two ends of the bridge span;
in the construction process, the top plates 4 and the bottom plates 5 of the cross box girder 1 are cut and removed in blocks from the bridge span to two ends along the longitudinal bridge direction by using a rope saw, in the embodiment, the top plates 3 and the bottom plates 4 are cut, removed and hoisted in blocks at intervals of 2m from the bridge span to the longitudinal bridge direction, and concrete strip blocks 8 with the width of 50cm are reserved between every two adjacent top plates 3 and between every two adjacent bottom plates 4; when the end part of the overline box girder 1 is close to, the blocks of the top plate 3 and the bottom plate 4 can be properly enlarged to improve the cutting and dismantling efficiency.
S5, arranging a fastening anchor cable system 6 for bearing the overline box girder 1;
as shown in fig. 3, the anchor buckle cable system 6 includes a vertical column 61 disposed on the non-span box girder 2, an anchor buckle cable 62 having one end anchored to the top of the vertical column 61 and the other end anchored to the span box girder 1, and an anchor cable 63 having one end anchored to the top of the vertical column 61 and the other end anchored to the non-span box girder 2; the upright post 61, the anchor buckle cable 62 and the anchor cable 63 jointly form a bearing structure for bearing the cantilever part of the overline box girder 1, a fixed end anchorage mode is adopted, and the anchor buckle cable 62 is anchored on the web plate 7 of the overline box girder 1.
The fastening anchor cable 62 comprises a proximal cable 621 with an anchoring point close to the end of the overline box girder 1 and a distal cable 622 with an anchoring point far away from the end of the overline box girder 1; in this embodiment, the proximal end cable 621 and the distal end cable 622 of the anchor-buckling cable 62 are respectively anchored at positions 6M and 12M away from the end of the span line box girder 1, the rear end anchor cable 63 is anchored at the side web of the non-span line box girder 2, the upright post 61 is divided into two groups, each group adopts 2 steel pipes with the height of 8M and the specification of phi 500 × 6mm, the anchor-buckling cable 62 is divided into two groups, each group is set to 8 steel strands with the diameter of 15.24mm and the strength of 1860M Pa, the anchor cable 63 is divided into 2 groups, and each group is set to 10 steel strands with the diameter of 15.24mm and the strength of 1860 MPa.
S6, respectively cutting and dismantling the web 7 of the cross box girder 1 from the middle to two ends of the bridge span;
as shown in fig. 3, in the construction process, the web 7 of the cross-line box girder 1 is cut and removed in blocks every 2m from the middle to two ends of the bridge span along the longitudinal bridge direction by using a rope saw, when the web is removed to a position near the distal cable 622, the tension of the anchoring end of the distal cable 622 is released, and then the distal cable 622 is removed, so as to reach the state shown in fig. 4; and similarly, the web 7 of the rest cross line box girder 1 is cut and removed at intervals of 2m from the middle to two ends of the bridge span along the longitudinal bridge direction, and when the web is removed to the position near the proximal end cable 621, the stress of the cantilever end of the cross line box girder 1 meets the allowable stress of the concrete box girder, so that the proximal end cable 621 can be removed, and then the web 7 of the rest cross line box girder 1 is removed.
And S7, removing the anchor cable fastening system 6 to finish the removal of the concrete box girder across the line-crossing hole.
After the proximal cable 621 is removed, the whole anchor cable system 6 can be removed until all the cross-line box girders 1 are removed, and the removal of the cross-line hole cross concrete box girder is completed.
According to the cross-line hole cross box girder dismantling method, after the cross-line box girder 1 flange plate 3 concrete block, the top plate 4 concrete block and the bottom plate 5 concrete block are divided, the cross-line box girder 1 flange plate 3 concrete block, the top plate 4 concrete block and the bottom plate 5 concrete block are sequentially cut and dismantled to form a frame structure, after the stability and safety of the cantilever end of the frame structure are ensured by arranging the anchor cable system 6, the cross-line box girder 1 web 7 is respectively cut and dismantled from the middle to the two ends of the bridge span until the cross-line box girder 1 is dismantled, the anchor cable system 6 is dismantled, the difficulty of cross-line hole cross concrete box girder dismantling construction is greatly reduced, the safety and the construction efficiency in the construction process are improved, the influence on the normal passing of existing lines under the bridge is small, and the practicability is strong.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (9)
1. A method for dismantling a concrete box girder across a span hole is characterized by comprising the following steps:
s1, building a protective shed frame below the cross box girder (1);
s2, dismantling auxiliary facilities of the bridge deck;
s3, cutting and dismantling the flange plates (3) of the cross box girder (1) from the middle to two ends of the bridge span respectively;
s4, respectively cutting and dismantling a top plate (4) and a bottom plate (5) of the cross box girder (1) from the middle to two ends of the bridge span;
s5, arranging a fastening anchor cable system (6) for bearing the overline box girder (1);
s6, respectively cutting and dismantling the web (7) of the cross box girder (1) from the middle to two ends of the bridge span;
s7, removing the anchor cable fastening system (6) to finish the removal of the concrete box girder across the line-crossing hole.
2. The method for dismantling a cross-line hole-crossing concrete box girder according to claim 1, wherein: in step S1, the protection canopy frame is a strip-shaped basic canopy frame.
3. The method for dismantling a cross-line hole-crossing concrete box girder according to claim 1, wherein: in step S2, the auxiliary facilities include street lamps, monitoring, anti-dropping nets, and a deck protection layer on the deck.
4. The method for dismantling a cross-line hole-crossing concrete box girder according to claim 1, wherein: in step S3, the flange plate (3) is cut and removed in blocks along the longitudinal bridge direction.
5. The method for dismantling a cross-line hole-crossing concrete box girder according to claim 1, wherein: in step S4, the top plate (4) and the bottom plate (5) are cut and removed in blocks along the longitudinal bridge direction, and a concrete strip (8) is reserved between two adjacent blocks.
6. The method for dismantling a cross-line hole-crossing concrete box girder according to claim 1, wherein: in step S5, the anchor cable system (6) includes a vertical column (61) disposed on the non-span box girder (2), and an anchor cable (62) having one end anchored to the top of the vertical column (61) and the other end anchored to the span box girder (1).
7. The method for dismantling a cross-line hole-crossing concrete box girder according to claim 6, wherein: the anchor cable buckling system (6) further comprises an anchor cable (63) with one end anchored at the top of the upright post (61) and the other end anchored at the non-span box girder (2).
8. The method for dismantling a cross-line hole-crossing concrete box girder according to claim 6, wherein: and the buckling anchor cable (62) is anchored on a web plate (7) of the overline box girder (1).
9. The method for dismantling a cross-line hole-crossing concrete box girder according to claim 6, wherein: the buckling anchor cable (62) comprises a proximal cable (621) with an anchoring point close to the end part of the cross box girder (1) and a distal cable (622) with an anchoring point far away from the end part of the cross box girder (1).
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| CN201910267686.3A CN110273385B (en) | 2019-04-03 | 2019-04-03 | Method for dismantling cross-line hole cross-concrete box girder |
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| CN201910267686.3A CN110273385B (en) | 2019-04-03 | 2019-04-03 | Method for dismantling cross-line hole cross-concrete box girder |
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| JP3861100B1 (en) * | 2005-10-19 | 2006-12-20 | 有限会社 松岡知的所有権事務所 | Bridge girder dismantling method |
| CN103938557B (en) * | 2014-03-11 | 2016-01-20 | 卢来运 | A kind of bridge crossing method for dismounting |
| CN104480868B (en) * | 2014-12-13 | 2016-06-22 | 中铁十九局集团第二工程有限公司 | On tear beam method open across the highway bridge of railway in operation |
| JP6365552B2 (en) * | 2016-01-08 | 2018-08-01 | Ｊｆｅスチール株式会社 | Steel floor slabs for concrete slabs and concrete slabs |
| CN106284109B (en) * | 2016-08-17 | 2018-02-06 | 中铁二十局集团第三工程有限公司 | On across both wired bridge main beam method for dismounting |
| CN107165062B (en) * | 2017-07-07 | 2019-03-12 | 中铁七局集团第一工程有限公司 | A method of removing Existing Railway Line gate-type pier capping beam protecting canopy frame |
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