CN113106879B - Connecting structure for widening concrete box girder by steel box girder and construction method - Google Patents
Connecting structure for widening concrete box girder by steel box girder and construction method Download PDFInfo
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- CN113106879B CN113106879B CN202110418329.XA CN202110418329A CN113106879B CN 113106879 B CN113106879 B CN 113106879B CN 202110418329 A CN202110418329 A CN 202110418329A CN 113106879 B CN113106879 B CN 113106879B
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
Abstract
A connecting structure and a construction method for widening a concrete box girder by using a steel box girder are disclosed, wherein the connecting structure comprises: including treating to widen concrete box girder, newly-built steel box girder and connecting the new and old bridge connection portion between treating to widen concrete box girder and newly-built steel box girder, wherein, new and old bridge connection portion includes concrete structure and sets up T font steel sheet, upper strata transverse reinforcement, lower floor transverse reinforcement and the vertical reinforcement in the concrete. The invention can improve the transverse integrity of the widened bridge, improve the stress performance of the weakest double-side wing edge part of the new bridge and the old bridge, and avoid secondary diseases at the part caused by repeated rolling of vehicles.
Description
Technical Field
The invention belongs to the technical field of bridge widening, and particularly relates to a connecting structure of a steel box girder and a concrete box girder.
Background
With the rapid increase of urban traffic volume, the situation that the traffic capacity is insufficient due to the fact that the bridge deck is not wide enough and the like is common to many bridges in service, in order to solve the problems, reconstruction and extension measures such as reinforcing, widening or dismantling reconstruction are carried out on existing bridges, reasonable widening and reconstruction are carried out on existing bridges, the effect of prolonging the service life of the existing bridges can be achieved, the cost can be saved, and the bearing capacity and the traffic capacity of the existing bridges can be improved. The existing concrete box girder with a large proportion in the existing bridge is widened mainly by adopting a method for splicing a new concrete bridge, and the traffic is greatly influenced due to a long construction period. Therefore, the construction can be accelerated by additionally arranging a steel box girder widening new bridge beside the existing concrete box girder bridge for widening. However, after the concrete box girder and the steel box girder are widened, the joint of the cantilever flange of the concrete box girder and the steel box girder directly bears the load of a vehicle, the stress condition is complex, if the joint structure is not properly processed, the connection between a new bridge and an old bridge is unstable, the integrity is poor, and secondary diseases such as cracking of a joint position and the like are easy to occur after the vehicle is opened for operation. Therefore, a reinforcing structure and a construction method for transversely connecting new bridges and old bridges by using concrete box girders and steel box girders, which are reliable in structure, economical and applicable, reasonable in stress and convenient to construct, are lacked at present so as to solve the problem of connection of different types of new bridges and old bridges.
Disclosure of Invention
The invention aims to solve the technical problem that the existing new and old bridge connection structure for widening a concrete box girder bridge by adopting a steel box girder is provided aiming at the problem that two different types of new and old bridges of the concrete box girder and the steel box girder are not available at present, and the new and old bridge connection structure is reliable in structure, economical and applicable, reasonable in stress and convenient and fast to construct and can effectively solve the problem of transverse connection between the concrete box girder and the steel box girder.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: the utility model provides a joint construction that is used for steel case roof beam to widen concrete case roof beam which characterized in that, joint construction includes: including treating to widen concrete box girder, newly-built steel box girder and connecting the new and old bridge connection portion between treating to widen concrete box girder and newly-built steel box girder, wherein, new and old bridge connection portion includes concrete structure and sets up T font steel sheet, upper strata transverse reinforcement, lower floor transverse reinforcement and the vertical reinforcement in the concrete.
In one embodiment, the T-shaped steel plate is fixedly attached to the outer wall of the newly constructed steel box girder opposite to the concrete box girder to be widened.
In one embodiment, the T-shaped steel plate comprises a bottom plate and a vertical plate vertically connected to the center of the bottom plate;
in one embodiment, the bottom plate is fixedly connected with the newly-built steel box girder. The vertical plate extends between the upper layer of transverse steel bars and the lower layer of transverse steel bars.
In one embodiment, the upper layer transverse steel bar and the lower layer transverse steel bar are both the original flange plate inner steel bar structure reserved after the concrete is removed from the original concrete box girder.
In one embodiment, the old and new bridge connecting parts 2 comprise oblique steel bars, which are the steel bar structures remained after the original concrete box girder is chiseled to remove the concrete structure
The invention relates to a construction method for widening a connection structure of a concrete box girder for a steel box girder, which comprises the following steps;
a. dismantling the bridge deck pavement of the concrete box girder to be widened, the railing and the concrete outer flange plate on the side to be widened, and reserving transverse stressed steel bars in the outer flange plate;
b. installing a newly-built steel box girder for widening;
c. welding a T-shaped steel plate on the newly-built steel box girder flange plate;
d. the transverse steel bars are welded with flange plates of the newly-built steel box girder;
e. welding and connecting the vertical steel bars with the T-shaped steel plate;
f. laying longitudinal steel bars in the flange plates of the concrete box girder to be cast again;
g. and pouring concrete of the concrete box girder flange plate again to form a new bridge connecting part and an old bridge connecting part.
In one embodiment, the method further comprises the step of h, after the strength of the concrete reaches the design strength, constructing a bridge deck pavement.
In one embodiment, the method further comprises replacing the original numbered parts when the chiseling concrete damages any one of the layer transverse steel bars, the lower layer transverse steel bars, the vertical steel bars and the diagonal steel bars.
In one embodiment, each row of the welding-increasing T-shaped steel plates is connected with the flange plate of the newly-built steel box girder in a welding mode such as groove welding;
the beneficial effects of the invention are:
1. the stress is reasonable, the structure is simple, the construction is convenient and fast, and the cost is lower;
2. the advantage of rapidness in steel box girder construction is fully utilized, and the construction period of broadening the reconstruction of the concrete box girder bridge is shortened;
3. the existing structure of the concrete box girder is fully utilized, the connecting joint of the steel box girder and the concrete box girder is formed by reforming the side box girder flange plate to be widened, and the connecting joint is tightly fixed with the steel box girder flange plate, so that the stress of the widened bridge is very reasonable;
4. the concrete box girder and the steel box girder are stably connected with two different types of new and old bridges, so that the overall stability of the widened bridge is improved, the driving comfort of the joint of the new and old bridges is improved, and secondary diseases such as cracking and the like at the joint of the new and old bridges after the operation and traffic are prevented;
5. the invention has simple structure and easy construction, and is suitable for the widening and reconstruction of concrete box girders in various highway bridges and municipal bridges.
Drawings
FIG. 1 is a schematic of one embodiment of the present invention;
FIG. 2 is a schematic layout of the steel bars and T-shaped steel plates after the concrete box girder to be widened is chiseled;
FIG. 3 is a structural view of a T-shaped steel plate.
The notation in the figure is:
1-concrete box girder to be widened; 2, connecting new and old bridges;
3, newly building a steel box girder flange plate, welding a T-shaped steel plate additionally; 4, newly building a steel box girder;
5-upper-layer transverse steel bars; 6-lower layer transverse steel bars;
7-vertical reinforcing steel bars; 8-original concrete box girder oblique reinforcing steel bars; 9-longitudinal reinforcement.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments to facilitate understanding for those skilled in the art.
The specific implementation mode is as follows: as shown in fig. 1 to 3, a new and old bridge transverse connection reinforcing structure according to the present embodiment, which is obtained by reconstructing an existing flange plate of a bridge to be widened, includes a concrete box girder 1 to be widened, a new steel box girder 4, and a new and old bridge connecting portion 2 connected between the concrete box girder 1 to be widened and the new steel box girder 4. The new bridge connecting part 2 and the old bridge connecting part 2 comprise a concrete structure, and T-shaped steel plates 3, upper-layer transverse steel bars 5, lower-layer transverse steel bars 6 and vertical steel bars 7 which are arranged in concrete.
In one embodiment, the T-shaped steel plate 3 is fixedly connected to the outer wall of the newly built steel box girder 4 opposite to the concrete box girder 1 to be widened, preferably by welding. In one scheme, the T-shaped steel plate 3 is fixedly connected to the vertical steel bars of the newly-built steel box girder 4.
In one embodiment, the T-shaped steel plate 3 comprises a bottom plate and an upright plate vertically connected to the center of the bottom plate, and in one embodiment, the bottom plate is fixedly connected to the newly-built steel box girder 4. The vertical plate extends between the upper layer of transverse steel bars 5 and the lower layer of transverse steel bars 6. In one embodiment, the vertical plate is located in the middle of the distance between the upper and lower transverse bars 5, 6.
In one embodiment, the upper layer transverse steel bar 5 and the lower layer transverse steel bar 6 are both the original flange plate inner steel bar structure remained after the concrete is removed from the original concrete box girder.
In one embodiment, the old and new bridge connecting portion 2 further comprises diagonal reinforcing bars 8. The oblique steel bars 8 are steel bar structures reserved after the concrete structure of the original concrete box girder is chiseled.
In one embodiment, the newly-built steel box girder flange plate is welded with the T-shaped steel plate 3 and the vertical steel bars 7 of the widened concrete girder flange plate.
In one embodiment, the upper layer transverse main reinforcement 5 and the lower layer transverse reinforcement 6 are fixedly connected with the flange plate of the newly-built steel box girder 4, preferably by welding.
In one embodiment, the longitudinal reinforcement 9 comprises at least an upper layer and a lower layer, wherein the upper layer longitudinal reinforcement 9 is connected with the upper layer transverse reinforcement 5, and wherein the lower layer longitudinal reinforcement 9 is connected with the lower layer transverse reinforcement 6. For example by steel structural bonding.
In one embodiment, there are multichannel longitudinal reinforcement 9 all lays along the longitudinal bridge that waits to widen the box girder to the direction, and its equipartition establishes on same horizontal plane, and the reinforcing bar interval is the same with the interior longitudinal reinforcement interval of former flange plate.
Furthermore, a plurality of transverse stress reinforcing steel bars are arranged inside the connecting part. The plurality of transverse stressed steel bars are all arranged along the transverse bridge direction of the box girder to be widened and are uniformly distributed on the same horizontal plane, and the steel bar distance is the same as the transverse steel bar distance in the original flange plate (not shown in the figure).
In one embodiment, the upper end of the vertical steel bar 7 without the position of the T-shaped steel plate 3 is connected with the upper layer transverse steel bar 5 and/or the upper layer longitudinal steel bar 9, and the lower end of the vertical steel bar 7 is connected with the lower layer transverse steel bar 6 and/or the upper layer longitudinal steel bar 9.
In one embodiment, the T-shaped steel plate 3 is made of two 10mm thick steel plates. The upper horizontal reinforcing steel bar 5, the lower horizontal reinforcing steel bar 6, the vertical reinforcing steel bar 7, former concrete box girder slant reinforcing steel bar 8 and the same model and the same specification and the same interval of the original reinforcing steel bar of the concrete box girder flange plate to be widened.
In one embodiment, the T-shaped steel plates 3 are arranged in a plurality of rows, the distance between adjacent front and back increase-welded T-shaped steel plates in each row of increase-welded T-shaped steel plates 3 is 20cm to 30cm, and the width of each steel plate is 20cm.
In one embodiment, the length of the T-shaped steel plate 3 penetrating into the connecting part is 1/4-5/12, preferably 1/3, of the width of the new concrete which is cast again after chiseling. Tests have found that the effect is relatively better when this value is taken. The reason for analyzing the steel plate is that when the value is increased, the shearing resistance bearing capacity of the connecting part can be improved, the bonding capacity of resisting relative sliding between the steel plate 3 and the concrete of the connecting part is ensured, and the common stress of the concrete box girder and the steel box girder is ensured.
In one embodiment, the new and old bridge connecting part 2 in the connecting construction for the steel box girder to widen the concrete box girder has the same structural size as the original size of the flange plate of the concrete box girder to be widened.
In one embodiment, the upper surface of the flange plate of the newly constructed steel box 4 and the upper surface of the concrete beam 1 to be widened are arranged on the same horizontal plane.
The invention also provides a construction method for widening the connection reinforced structure of the concrete box girder on the steel box girder, which comprises the following steps:
a. dismantling the bridge deck pavement of the concrete box girder to be widened, the railing and the concrete outer flange plate on the side to be widened, and reserving transverse stressed steel bars 5 and 6 in the outer flange plate;
b. installing a newly-built steel box girder 4 for widening;
c. welding a T-shaped steel plate 3 on the newly-built steel box girder flange plate;
d. the transverse steel bars 5 and 6 are welded with the flange plate of the newly-built steel box girder 4;
e. welding and connecting the vertical steel bars 7 with the T-shaped steel plates 3;
f. laying longitudinal steel bars 9 in the flange plates of the concrete box girders to be poured again;
g. pouring concrete on the flange plate of the concrete box girder again to form a new bridge connecting part 2 and an old bridge connecting part 2;
in one embodiment, the method further comprises h. constructing a bridge deck pavement after the concrete strength reaches the design strength.
In one embodiment, the T-shaped steel plate 3 comprises a bottom plate and an upright plate vertically connected to the center of the bottom plate, and in one embodiment, the bottom plate is fixedly connected with the newly-built steel box girder 4. The vertical plate extends between the upper layer transverse reinforcing steel bar 5 and the lower layer transverse reinforcing steel bar 6. In one embodiment, the vertical plate is located in the middle of the distance between the upper and lower transverse bars 5, 6.
In one embodiment, the method further comprises retaining the original concrete box girder diagonal reinforcement bars 8 while chiseling out the concrete.
In one embodiment, the method further comprises replacing the horizontal steel bars 5, the lower horizontal steel bars 6, the vertical steel bars 7 and the diagonal steel bars 8 according to the original reference numbers when the concrete is chiseled off to damage any one of the horizontal steel bars.
In one embodiment, when the concrete box girder flange plate concrete is poured again, the small stone concrete with the same label as the original concrete box girder is adopted.
In one embodiment, each row of the increase-welding T-shaped steel plates is connected with the flange plate of the newly-built steel box girder by adopting a welding mode such as groove welding.
A concrete embodiment of the construction method for a steel box girder widening connecting structure of a concrete box girder according to the present invention will be described with reference to the accompanying drawings, the method comprising the steps of;
a. dismantling the bridge deck pavement of the concrete box girder to be widened, the railing and the concrete outer flange plate on the side to be widened, and keeping 5/6 of transverse stressed steel bars in the outer flange plate;
b. after the construction of the lower part of the newly-built steel box girder bridge is completed, installing a newly-built steel box girder 4 for widening;
c. welding T-shaped steel plates 3 on the flange plates of the newly-built steel box girder, and enabling the T-shaped steel plates 3 to penetrate into the position, where the new and old bridges are connected with newly-poured concrete 2, of the newly-built bridge at equal intervals along the longitudinal direction of the bridge;
d. welding and connecting the exposed transverse steel bars 5/6 after the flange plates are chiseled off with the flange plates of the newly-built steel box girder 4;
e. welding and connecting a newly-built steel box girder flange plate additionally-welded T-shaped steel plate 4 with a vertical steel bar 7 of a widened concrete girder flange plate;
f. laying longitudinal steel bars 9 in the flange plates of the concrete box girders to be poured again;
g. pouring concrete on the flange plate of the concrete box girder again to form a new bridge connecting part 2 and an old bridge connecting part 2;
h. and after the strength of the concrete reaches the designed strength, constructing the bridge deck pavement.
In practice, the following factors should be considered:
(1) And (5) setting the structure size. According to the concept and the embodiment of the invention, the sizes of the T-shaped steel plates 3 additionally welded on the connecting parts 2 of the new and old bridges and the flange plates of the newly-built steel box girder can be adjusted according to the results of the integral stress analysis and the local stress analysis of the bridges.
(2) And (5) setting the specification of the steel bars. According to the conception and the embodiment of the invention, the newly-built steel box girder 4, the upper layer transverse steel bar 5, the lower layer transverse steel bar 6, the vertical steel bar 7 and the original concrete box girder oblique steel bar 8 are seriously damaged or broken when the concrete box girder flange plate at the side to be widened is chiseled, and can be replaced according to the same model and the same specification as the original steel bar of the concrete box girder flange plate to be widened, or can be adjusted to be not less than the model and the specification of the original steel bar of the concrete box girder flange plate to be widened according to the whole stress analysis result and the local stress analysis result of the bridge.
(3) The conditions of use of the present invention. According to the conception and the embodiment of the invention, the bridge technical condition evaluation and the necessary structure stress detection calculation are carried out on the existing bridge to be widened before the use of the invention, so as to meet the requirements of the whole stress and the local stress of the bridge after the invention is adopted.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a joint construction that is used for steel case roof beam to widen concrete case roof beam which characterized in that, joint construction includes: the concrete box girder comprises a concrete box girder to be widened, a newly-built steel box girder and a new and old bridge connecting part connected between the concrete box girder to be widened and the newly-built steel box girder, wherein the new and old bridge connecting part comprises a concrete structure, and a T-shaped steel plate, an upper layer of transverse steel bars, a lower layer of transverse steel bars and vertical steel bars which are arranged in concrete; wherein; the upper-layer transverse steel bars and the lower-layer transverse steel bars are welded with flange plates of the newly-built steel box girder; the new bridge connecting part and the old bridge connecting part are formed by pouring concrete on the flange plate of the concrete box girder again;
the T-shaped steel plate is fixedly connected to the outer wall of the newly-built steel box girder, which is opposite to the concrete box girder to be widened;
the T-shaped steel plate comprises a bottom plate and a vertical plate vertically connected to the center of the bottom plate;
the bottom plate is fixedly connected with the newly-built steel box girder; the vertical plate extends between the upper layer transverse steel bar and the lower layer transverse steel bar; the T-shaped steel plate is welded with the vertical steel bar of the widened concrete beam flange plate; the length of the T-shaped steel plate extending into the connecting part of the new bridge and the old bridge is 1/4-5/12 of the width of the new concrete poured after chiseling.
2. The connection structure for widening the concrete box girder by the steel box girder according to claim 1, is characterized in that: and the upper-layer transverse steel bars and the lower-layer transverse steel bars are steel bar structures in the original flange plates reserved after the concrete is chiseled out of the original concrete box girder.
3. The connection structure for the steel box girder and the widened concrete box girder according to claim 1 or 2, is characterized in that: the new and old bridge connecting part comprises oblique steel bars, and the oblique steel bars are of steel bar structures reserved after the concrete structure of the original concrete box girder is chiseled.
4. A construction method for widening a connection structure of a concrete box girder by a steel box girder according to any one of claims 1 to 3, wherein: comprises the following steps;
a. dismantling the bridge deck pavement of the concrete box girder to be widened, the railing and the concrete outer flange plate at the side to be widened, and reserving transverse stress steel bars in the outer flange plate;
b. installing a newly-built steel box girder for widening;
c. welding a T-shaped steel plate on the newly-built steel box girder flange plate;
d. the transverse steel bars are welded with flange plates of the newly-built steel box girder;
e. welding and connecting the vertical steel bars with the T-shaped steel plates;
f. re-laying longitudinal steel bars in the flange plates of the concrete box girder to be re-poured;
g. and pouring concrete on the flange plate of the concrete box girder again to form a new bridge connecting part and an old bridge connecting part.
5. The construction method according to claim 4, wherein: and h, constructing bridge deck pavement after the strength of the concrete reaches the design strength.
6. The construction method according to claim 4, wherein: the method further comprises the step of replacing the parts according to the original marks when the concrete is chiseled off to damage any one of the horizontal reinforcing steel bars of the upper layer, the horizontal reinforcing steel bars of the lower layer, the vertical reinforcing steel bars and the oblique reinforcing steel bars.
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| CN114164747B (en) * | 2021-12-21 | 2023-11-03 | 上海市政工程设计研究总院（集团）有限公司 | New and old structure cooperative stress structure for bridge widening |
| CN114775461A (en) * | 2022-04-07 | 2022-07-22 | 清华大学 | Concrete bridge widening and reinforcing structure and construction method thereof |
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