CN113073557A - Method for mounting concrete bridge deck of steel-concrete combined continuous steel truss bridge - Google Patents
Method for mounting concrete bridge deck of steel-concrete combined continuous steel truss bridge Download PDFInfo
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- CN113073557A CN113073557A CN202110298376.5A CN202110298376A CN113073557A CN 113073557 A CN113073557 A CN 113073557A CN 202110298376 A CN202110298376 A CN 202110298376A CN 113073557 A CN113073557 A CN 113073557A
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- steel
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- bridge deck
- bridge
- tensioning
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling 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
- E01D19/00—Structural or constructional details of 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for 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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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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
- E01D2101/30—Metal
Abstract
The invention discloses a method for installing a concrete bridge deck of a steel-concrete combined continuous steel truss bridge, and relates to the technical field of bridge engineering construction. After the continuous steel truss girder is erected beyond one hole, the prefabricated bridge deck slab is synchronously installed; after continuous steel trusses are closed, pier top steel trusses are jacked at intervals in batches, longitudinal and transverse wet joint pouring of a bridge deck, transverse post-tensioning prestressed steel beam tensioning, shear nail groove pouring, pier top steel trusses falling beams, longitudinal post-tensioning prestressed steel beam tensioning and the like are performed. The concrete bridge deck is installed and the steel truss girder is erected synchronously, so that the construction period can be effectively saved; pouring a bridge deck wet joint after the steel trussed beams span and jack up, and then dropping the beams to enable the bridge deck in the hogging moment area of the steel trussed beams to be squeezed and pressed, so that partial tensile stress generated by the concrete bridge deck in the bridge operation state is counteracted; and pouring a shear nail groove after transversely tensioning the prestressed steel beam to ensure that the transverse tensioning force is completely acted on the highway bridge deck, so as to prevent the initial stress generated by the transverse stress of the steel beam.
Description
Technical Field
The invention relates to the technical field of bridge engineering construction, in particular to a method for installing a prestressed concrete bridge deck of a steel-concrete combined continuous steel truss bridge.
Background
The steel concrete combined bridge can give full play to the respective advantages of two materials of steel and concrete, can realize factory manufacturing to the greatest extent, and reduces field operation. The concrete bridge deck can be hoisted after being prefabricated, and the construction is flexible and convenient.
The advantages of the steel concrete combined bridge are as follows: compared with a steel bridge, the corrosion of the steel beam can be greatly reduced, and the service life of the bridge is prolonged.
In the traditional construction method of the structure, the pre-pressing effect of the concrete bridge deck is achieved and the cracking of the concrete bridge deck is avoided only by increasing the prestressed steel bundles, and the construction method easily causes great waste of the prestressed steel bundles.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for installing a concrete bridge deck of a steel-concrete combined continuous steel truss bridge, which can economically and efficiently offset partial tensile stress generated by the concrete bridge deck in a bridge operation state.
The invention provides a method for installing a concrete bridge deck of a steel-concrete combined continuous steel truss girder bridge, which comprises the following steps of:
s1, prefabricating a concrete bridge deck;
s2, installing a concrete bridge deck: after the steel truss girder is erected over one hole, synchronously hoisting the concrete bridge deck;
s3, jacking a first wheel with even-numbered main pier top steel beams, pouring a wet joint of a bridge deck in a pier top negative bending moment area, tensioning the transverse backward-tensioned prestressed steel bundles after the design strength is reached, then, dropping the even-numbered main pier top steel beams, and constructing the longitudinal backward-tensioned prestressed steel bundles in the pier top negative bending moment area;
s4, jacking odd-numbered main pier top steel beams by the second wheel, pouring a wet joint of a bridge deck in a pier top hogging moment area, tensioning the transversely post-tensioned prestressed steel bundles after the design strength is reached, and then dropping the odd-numbered main pier top steel beams; constructing a longitudinal post-tensioned prestressed steel strand in a hogging moment area of the pier top;
s5, longitudinal and transverse wet joints of the bridge deck in the side span and span positive bending moment area are poured, the transverse post-tensioning prestressed steel bundles are tensioned after the designed strength is achieved, and then the longitudinal post-tensioning prestressed steel bundles are tensioned.
The method preferably includes the step of performing a pre-tensioning process and a post-tensioning process on the concrete deck slab in the step S1.
The technical scheme for improving the method is that the concrete bridge deck slab in the step S2 always lags behind the erection of the continuous steel trussed beams by not less than 1 pier position before the steel trussed beams are closed, and the installation of the rest bridge deck slabs is completed after the steel trussed beams are closed.
In a further improved technical solution, in the steps S3 and S4, the wet joints of the bridge deck in the hogging moment area at the top of the pier comprise transverse wet joints and longitudinal wet joints.
The technical scheme of further improvement is that the steps S3 and S4 include a pouring shear nail groove, and the operation of the pouring shear nail groove is completed after the transverse post-tensioning prestressed steel beam is tensioned and before the pier-top steel beam falls down.
In a further improved technical solution, in the steps S3 and S4, a plurality of pier tops can be simultaneously operated when the top beam and the beam falling operation are performed.
The still further improved technical scheme is that the step S5 includes a pouring shear nail groove, and the operation of the pouring shear nail groove is completed before the longitudinal post-tensioned prestressed steel bundles in the side span and mid-span positive bending moment area are tensioned after the transverse post-tensioned prestressed steel bundles are tensioned.
A more preferable technical solution is that, in step S1, the boards are temporarily stored in the board storage area in the pre-yard.
The present invention also provides a precast concrete deck slab, comprising: the concrete bridge deck slab comprises a concrete bridge deck slab body, wherein transverse backward-tensioned prestressed steel bundles and longitudinal backward-tensioned prestressed steel bundles are arranged in the concrete bridge deck slab body.
The invention has the beneficial effects that:
1. according to the invention, the bridge deck wet joint is poured after the steel trussed beams are separated to span and jack up, and then the beams are dropped to enable the bridge deck in the hogging moment area of the steel trussed beams to be squeezed and pressed, so that partial tensile stress generated by the concrete bridge deck in the bridge operation state is counteracted.
2. According to the installation method of the concrete bridge deck of the steel-concrete combined continuous steel truss girder bridge, the installation of the concrete bridge deck and the erection of the steel truss girder are carried out synchronously, and the construction period can be effectively shortened.
3. According to the invention, the shear nail groove is poured after the transverse tension prestressed steel beam, so that the transverse tension force is completely acted on the highway bridge deck, and the steel beam is prevented from generating initial stress due to transverse stress.
Drawings
Fig. 1 is a flow chart of an installation method in an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating a bridge deck erecting process according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of the bridge deck after erection in the embodiment of the present invention.
Fig. 4 is a layout drawing of 1/2 single-span longitudinal post-tensioned prestressed steel strands in the embodiment of the invention.
Fig. 5 is a schematic view of the structure in the direction of a-a in the structure shown in fig. 4.
Fig. 6 is a layout view of a bridge deck slab transverse prestress steel beam in the embodiment of the invention.
FIG. 7 is a schematic diagram of the structure of FIG. 6 showing the direction A '-A'.
Fig. 8 is a cross-sectional view of the structure after the installation of the embodiment of the invention.
The concrete bridge comprises 1-concrete bridge deck, 2-shear nail grooves, 3-positive bending moment area longitudinal post-tensioned prestressed steel bundles, 4-middle girders, 5-negative bending moment area longitudinal post-tensioned prestressed steel bundles, 6-positive bending moment area, 7-negative bending moment area, 8-side girders, 9-longitudinal post-tensioned prestressed steel bundles, 10-bridge center line, 11-transverse wet joint, 12-longitudinal wet joint, 13-pier center line (excluding side piers), 14-single span center line or side pier center line, 15-tensioning grooves and 16-transverse post-tensioned prestressed steel bundles.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of the specific implementation and operation principle of the installation method of the concrete bridge deck of the steel-concrete combined continuous steel truss bridge according to the present invention with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1, the installation method of the concrete bridge deck of the steel-concrete combined continuous steel truss bridge provided by the embodiment of the invention comprises the following steps:
firstly, prefabricating a concrete bridge deck 1; preferably, the prefabrication method of the concrete deck slab 1 includes a pre-tensioning method and a post-tensioning method. After the prefabrication of the concrete bridge deck slab 1 in the prefabrication field is finished, the concrete bridge deck slab is temporarily stored in a slab storage area in the prefabrication field.
Secondly, installing a concrete bridge deck 1: after the steel truss girder is erected beyond one hole, synchronously hoisting the prefabricated bridge deck slab 1; before the steel trussed beams are closed, the concrete bridge deck 1 is always installed at not less than 1 pier position behind the erection of the continuous steel trussed beams, as shown in figure 2, the installation of the rest bridge deck 1 is completed after the steel trussed beams are closed, and the structure of the bridge deck 1 after the erection is completed in the embodiment of the invention is shown in figure 3.
Thirdly, jacking even-numbered main pier top steel beams by the first wheel, and pouring longitudinal and transverse wet joints of the bridge deck in the pier top hogging moment area to achieve the design strength and post-tensioning transverse post-tensioning prestressed steel bundles; pouring a shear nail groove; and after the shear nail groove concrete reaches the design strength, the pier top steel beams of the even-numbered main piers fall to the beam, and the longitudinal post-tensioned prestressed steel bundles in the hogging moment area of the construction pier top.
Fourthly, jacking the odd-numbered main pier top steel beams by the second wheel, pouring a bridge deck wet joint in a pier top hogging moment area, post-tensioning the transverse post-tensioning prestressed steel bundles to reach the designed strength, and pouring a shear nail groove; after the shear nail groove concrete reaches the design strength, the odd-numbered main pier top steel beams fall off; and (5) constructing a longitudinal post-tensioned prestressed steel strand in the hogging moment area of the pier top.
Fifthly, longitudinal and transverse wet joints of the bridge deck in the side span and mid-span positive bending moment area are poured, and the post-tensioning transverse post-tensioning prestressed steel bundles with the designed strength are achieved; pouring a shear nail groove; and after the concrete reaches the designed strength, tensioning the longitudinal post-tensioned prestressed steel bundles.
The cross section of the structure after the installation of the embodiment of the invention is shown in fig. 8.
The prefabricated concrete deck slab 1 employed in the embodiment of the present invention includes: the longitudinal and transverse post-tensioned prestressed steel bundles.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A method for installing a concrete bridge deck of a steel-concrete combined continuous steel truss bridge is characterized by comprising the following steps of:
s1, prefabricating a concrete bridge deck;
s2, installing a concrete bridge deck: after the steel truss girder is erected over one hole, synchronously hoisting the concrete bridge deck;
s3, jacking a first wheel with even-numbered main pier top steel beams, pouring a wet joint of a bridge deck in a pier top negative bending moment area, tensioning the transverse backward-tensioned prestressed steel bundles after the design strength is reached, then, dropping the even-numbered main pier top steel beams, and constructing the longitudinal backward-tensioned prestressed steel bundles in the pier top negative bending moment area;
s4, jacking odd-numbered main pier top steel beams by the second wheel, pouring a wet joint of a bridge deck in a pier top hogging moment area, tensioning the transversely post-tensioned prestressed steel bundles after the design strength is reached, and then dropping the odd-numbered main pier top steel beams; constructing a longitudinal post-tensioned prestressed steel strand in a hogging moment area of the pier top;
s5, longitudinal and transverse wet joints of the bridge deck in the side span and span positive bending moment area are poured, the transverse post-tensioning prestressed steel bundles are tensioned after the designed strength is achieved, and then the longitudinal post-tensioning prestressed steel bundles are tensioned.
2. The method for installing a concrete deck slab for a steel-concrete-combined continuous steel girder bridge according to claim 1, wherein the method for prefabricating the concrete deck slab in the step S1 includes a pre-tensioning method and a post-tensioning method.
3. The method for installing the concrete bridge deck slab of the steel-concrete combined continuous steel truss bridge according to claim 1 or 2, wherein the concrete bridge deck slab in the step S2 is installed before the steel trusses are closed, the installation always lags behind the erection of the continuous steel trusses by not less than 1 pier, and the installation of the rest bridge deck slabs is completed after the steel trusses are closed.
4. The method for installing a concrete bridge deck slab comprising a steel and concrete combined continuous steel truss bridge as claimed in claim 3, wherein the wet joints of the deck slab in the hogging moment region of the pier top include a transverse wet joint and a longitudinal wet joint in the steps S3 and S4.
5. The method for installing a concrete deck slab of a steel-concrete combined continuous steel truss bridge as claimed in claim 4, wherein the steps S3 and S4 include casting the shear pin groove, and the casting of the shear pin groove is completed after the transverse post-tensioned prestressed steel beam is tensioned and before the pier-top steel beam falls down.
6. The method for installing a concrete deck slab for a steel-concrete-combined continuous steel girder bridge according to claim 5, wherein a plurality of pier tops are simultaneously operated while the girder cutting and falling operations are performed in the steps S3 and S4.
7. The method as claimed in claim 6, wherein the step S5 includes casting the shear pin groove after the transverse post-tensioned prestressed steel beam is tensioned and before the longitudinal post-tensioned prestressed steel beam in the side span and mid-span positive bending moment region is tensioned.
8. The method for installing a concrete deck slab for a steel-concrete-combined continuous steel girder bridge according to claim 7, wherein the slab storage area is temporarily stored in a precast yard in step S1.
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| CN202110298376.5A CN113073557B (en) | 2021-03-19 | 2021-03-19 | Method for mounting concrete bridge deck of steel-concrete combined continuous steel truss bridge |
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| CN202110298376.5A CN113073557B (en) | 2021-03-19 | 2021-03-19 | Method for mounting concrete bridge deck of steel-concrete combined continuous steel truss bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114775424A (en) * | 2022-04-20 | 2022-07-22 | 中交一公局集团有限公司 | Prefabricated installation construction method for assembled steel-mixed beam panel |
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