CN216515071U - Continuous beam arch bridge of steel web-concrete combined box girder - Google Patents
Continuous beam arch bridge of steel web-concrete combined box girder Download PDFInfo
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- CN216515071U CN216515071U CN202122653245.2U CN202122653245U CN216515071U CN 216515071 U CN216515071 U CN 216515071U CN 202122653245 U CN202122653245 U CN 202122653245U CN 216515071 U CN216515071 U CN 216515071U
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Abstract
The utility model discloses a continuous beam arch bridge of a steel web-concrete combined box girder, which comprises a girder body, arch ribs and a suspender, wherein the girder body comprises a steel web-concrete combined box girder section, a concrete girder section and a girder section transition combination area for connecting the steel web-concrete combined box girder section and the concrete girder section, the concrete girder section is arranged near a middle fulcrum and an edge fulcrum, the steel web-concrete combined box girder section is arranged at the middle span or is simultaneously arranged at the middle span and the edge span, and the arch ribs are connected with the steel web-concrete combined box girder section through the suspender. In the utility model, the steel web-concrete combined box girder beam is used for replacing a concrete girder in partial girder sections, the sections have light weight, the field operation amount is less, and the construction speed is high. The main bridge structure has the advantages of small dead weight, small support tonnage and low support manufacturing and maintenance cost, can further expand the applicable span of the continuous beam arch bridge, is beneficial to the seismic resistance of the bridge, and has wide application prospect in high-intensity seismic areas.
Description
Technical Field
The utility model belongs to the technical field of bridge structure buildings, and particularly relates to a continuous beam arch bridge of a steel web-concrete combined box girder.
Background
The continuous beam-arch composite structure has the characteristics of high structural rigidity, good dynamic performance, high spanning capability, attractive appearance and the like, and is widely applied to the construction of high-speed railway bridges in China. The self weight of the bridge type structure is borne by the main beam, and the second-stage dead load and live load in the main span range are borne by the stiffening arch.
Because the bridge type upper structure and the bridge type lower structure are connected by adopting the support, the large-span concrete continuous beam arch combined structure needs to adopt a large-tonnage bridge support, and the support manufacturing and maintenance cost is high; the beam body of the long-span concrete continuous beam-arch combined structure has heavy weight, and when the beam body is applied to a high-intensity seismic region, the seismic response is large, so that the design of piers and foundations is difficult; in order to balance the horizontal thrust of the arch springing, a large amount of prestress is arranged in the concrete main beam, so that the beam body is greatly contracted and creep, the smoothness of a track during the running of a high-speed railway is influenced, and the problem of down-warping exists in a long-term operation span.
The span capacity and the application range of the continuous beam-arch composite structure are limited by the factors, and the continuous beam-arch composite structure with less span of more than 200 meters is adopted at present.
Disclosure of Invention
The utility model is provided for solving the problems in the prior art, and aims to provide a continuous beam arch bridge of a steel web-concrete combined box girder.
The technical scheme of the utility model is as follows: a continuous beam arch bridge of a steel web-concrete combined box girder comprises a girder body, arch ribs and a suspender, wherein the girder body comprises a girder section transition combination area of a steel web-concrete combined box girder section, a concrete girder section and a transition connection, the concrete girder section is arranged near a middle fulcrum and an edge fulcrum, the steel web-concrete combined box girder section is arranged at a middle span or simultaneously arranged at the middle span and the edge span, and the arch ribs in the middle span range are connected with the steel web-concrete combined box girder section through the suspender.
Still further, the steel web-concrete combined box girder section comprises a steel web part and a concrete part, wherein the concrete part comprises a concrete top part located at the top and a concrete bottom plate located at the bottom, the top end of the steel web part is fixed with the lower part of the concrete top, and the upper part of the concrete bottom plate at the bottom end of the steel web part is fixed.
Furthermore, the top of the steel web part is welded with a lifting point ear plate, and the lifting point ear plate fixes the suspender.
Furthermore, a steel diaphragm plate is arranged at each lifting point of the steel web part, and a manhole is arranged in each steel diaphragm plate.
Furthermore, the steel web plate part is connected with the concrete part through a shear connector, and the concrete part is internally provided with prestressed steel bundles arranged along the bridge direction.
Furthermore, the beam section transition combination area comprises a bearing plate and a bearing plate shear connector for fixing, and the bearing plate anchors and fixes the prestressed steel beams in the web plate in the concrete beam section.
Furthermore, the prestressed steel bundles in the concrete top plate and the concrete bottom plate in the steel web-concrete combined box girder section and the prestressed steel bundles in the top plate and the bottom plate in the concrete girder section are arranged in a full-length and corresponding mode.
Furthermore, the number of the transversely arranged steel web parts is more than two, and the steel web parts on the outermost sides are perpendicular/oblique to the concrete parts.
The utility model has the following beneficial effects:
in the utility model, the steel web-concrete combined box girder beam is used for replacing a concrete girder in partial girder sections, the sections have light weight, the field operation amount is less, and the construction speed is high.
The main bridge structure has the advantages of small dead weight, small support tonnage and low support manufacturing and maintenance cost, can further expand the applicable span of the continuous beam arch bridge, is beneficial to the seismic resistance of the bridge, and has wide application prospect in high-intensity seismic areas.
The arch bridge construction method comprises the steps of constructing the steel web part, and then using the steel web part as a top bottom plate for supporting and constructing the arch ribs and the concrete part, wherein the arch foot thrust generated by the self weight of the structure can be completely transmitted to the steel web part, the arch foot thrust generated by the second-stage constant load and live load is jointly born by the steel web part and the prestressed steel bundles in the concrete part, and the using amount of the prestressed steel bundles can be greatly reduced.
In the utility model, because the main beam part adopts the steel web plate-concrete combined beam, creep after working is smaller, the smoothness of the track is good, and the safety, the stability and the comfort of the high-speed train can be ensured;
the length of the side span is flexible and changeable, and if the side span has a passing clearance requirement, the corrugated steel web plate-concrete combined box girder can be adopted to increase the side span; if the side span has no passing clearance requirement, a pure concrete beam can be adopted to reduce the side span, so that the material consumption is saved.
Drawings
FIG. 1 is a schematic overall structure diagram of a first embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure of a second embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view taken along line I-I of FIG. 1 in accordance with the present invention;
FIG. 4 is a schematic cross-sectional view II-II of FIG. 1 in accordance with the present invention;
FIG. 5 is a schematic cross-sectional view III-III of FIG. 1 according to the present invention;
FIG. 6 is a schematic elevational view of a beam section transition junction according to the present invention;
FIG. 7 is a schematic illustration of the construction of the present invention;
in the figure:
1 steel web-concrete combined box girder section
2 concrete beam section 3 beam section transition
4-arch rib 5-hanging rod
1-1 Steel Web 1-2 concrete section
1-3 lifting point ear plate 1-4 steel diaphragm plate
1-5 shear connector 1-6 prestressed steel beam
3-1 bearing plate and 3-2 bearing plate shear connectors.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in figures 1-7, a continuous beam arch bridge of a steel web-concrete combined box girder comprises a girder body, arch ribs 4 and a suspender 5, wherein the girder body comprises a steel web-concrete combined box girder section 1, a concrete girder section 2 and a girder section transition combination area 3 for transitionally connecting the two, the concrete girder section 2 is arranged near a middle fulcrum and an edge fulcrum, the steel web-concrete combined box girder section 1 is arranged at a middle span or simultaneously arranged at the middle span and the edge span, and the arch ribs 4 at the middle span range are connected with the steel web-concrete combined box girder section 1 through the suspender 5.
The steel web-concrete combined box girder section 1 comprises a steel web portion 1-1 and a concrete portion 1-2, wherein the concrete portion 1-2 comprises a concrete top portion located at the top and a concrete bottom plate located at the bottom, the top end of the steel web portion 1-1 is fixed with the lower portion of the concrete top portion, and the upper portion of the concrete bottom plate at the bottom end of the steel web portion 1-1 is fixed.
The top of the steel web part 1-1 is welded with a lifting point ear plate 1-3, and the lifting point ear plate 1-3 fixes the suspender 5.
The steel web plate part 1-1 is provided with a steel diaphragm plate 1-4 at the position of a lifting point, and a manhole is arranged in the steel diaphragm plate 1-4.
The steel web plate part 1-1 and the concrete part 1-2 are connected through a shear connector 1-5, and prestressed steel bundles 1-6 arranged along the bridge direction are arranged in the concrete part 1-2.
The beam section transition combination area 3 comprises a bearing plate 3-1 and a bearing plate shear connector 3-2 for fixing, and the bearing plate 3-1 anchors and fixes prestressed steel bundles 1-6 in a web plate in the concrete beam section 2.
The prestressed steel bundles 1-6 in the concrete top plate and the concrete bottom plate in the steel web-concrete combined box girder section 1 and the prestressed steel bundles 1-6 in the top bottom plate in the concrete girder section 2 are correspondingly arranged in full length.
The number of the transversely arranged steel web parts 1-1 is more than two, and the steel web part 1-1 at the outermost side is perpendicular/oblique to the concrete part 1-2.
As shown in fig. 2, when the steel web-concrete composite box girder section 1 is arranged at a midspan, the steel web part 1-1 adopts a straight steel web, the straight steel web is an i-shaped cross section, and the inner side wall is provided with a longitudinal stiffening rib.
As shown in figure 1, the steel web-concrete combined box girder section 1 is simultaneously arranged at a mid-span and an edge-span, and the steel web part 1-1 in the edge-span adopts a corrugated steel web.
Correspondingly, the lifting point ear plates 1-3 can be in a gusset plate form, an anchor plate form and a lifting lug form with a pin hole:
the lifting point ear plates 1-3 can be in the form of node plates and are used for connecting a rigid lifting rod; the lifting point ear plates 1-3 can be in the form of anchor plates for connecting flexible slings; the lifting point ear plates 1-3 can be in the form of lifting lugs with pin holes and are used for connecting a lifting rod with a pin shaft.
Correspondingly, the shear connectors 1-5 are rigid connectors, such as profile steel, PBL shear keys and the like; the shear connectors 1-5 can also be flexible connectors, such as studs, bolts, steel bar shear keys and the like; the shear connectors 1-5 can also be frictional connectors, such as high-strength bolt connectors and the like; or in a composite form of the above shear keys.
When the steel web-concrete combined box girder section 1 is arranged at a midspan, the midspan can be one span or multiple spans.
The bearing plate shear connector 3-2 and the bearing plate 3-1 are of an integral structure, and the bearing plate shear connector 3-2 fixes the bearing plate 3-1 and ensures that the bearing plate 3-1 is perpendicular to the prestressed steel beam 1-6.
The position of the prestressed steel bundles 1-6 in the concrete part 1-2 corresponds to the position of the steel web part 1-1.
And in the section where the non-lifting point ear plate 1-3 is located, the concrete part 1-2 is subjected to thickness reduction, and the thickness reduction position is between the fixed positions of the steel web part 1-1.
As an embodiment
As shown in fig. 1, the construction method of the continuous beam arch bridge with the straight steel web-concrete combined box girder at the midspan and the corrugated steel web-concrete combined box girder at the side span comprises the following steps:
a. erecting a full-hall support on site, and constructing a concrete beam section 2 and a beam section transition combination area 3;
b. 1-1 sections of the steel web plate part are processed in a factory, shear connectors 1-5 are welded at the top of a top plate and the bottom of a bottom plate of the steel web plate part 1-1, and lifting point lugs 1-3 are welded at the lifting point positions at the top of the top plate;
c. 1-1 sections of the steel web plate part are assembled to 1-1 sections of the steel web plate part by the cantilever, and the sections are connected in a welding mode;
in this manner, the cantilever assembly steel web portion 1-1 segment to steel web portion 1-1 closure includes a mid-span closure and a side-span closure.
d. Constructing an arch rib 4, and erecting a support frame assembly construction by taking the steel web plate part 1-1 as a support, or erecting a tower frame at the top of the middle fulcrum concrete beam section 2 for vertical rotation construction;
e. a suspender 5 is arranged between the arch rib 4 and the suspension point ear plates 1-3, and initial tensioning is carried out;
f. respectively erecting a template, binding reinforcing steel bars and pouring concrete above and below the steel web plate part 1-1 to form a concrete part 1-2, and stretching longitudinal prestressed steel bundles 1-6 in a segmented manner;
j. and (4) performing final tensioning on the suspender 5, removing the full support to perform system conversion, and performing construction for the second period to form a bridge.
As still another embodiment
As shown in fig. 2, the construction method of the continuous girder arch bridge using the straight web-concrete composite box girder only in the midspan includes the steps of:
a. erecting a full-hall support on site, and constructing a concrete beam section 2 and a beam section transition combination area 3;
b. 1-1 sections of the steel web plate part are processed in a factory, shear connectors 1-5 are welded at the top of a top plate and the bottom of a bottom plate of the steel web plate part 1-1, and lifting point lugs 1-3 are welded at the lifting point positions at the top of the top plate;
c. 1-1 sections of the steel web plate part are assembled to 1-1 sections of the steel web plate part by the cantilever, and the sections are connected in a welding mode;
in this manner, the cantilever erection steel web portion 1-1 segment to steel web portion 1-1 closure, including only the mid-span closure.
d. Constructing an arch rib 4, and erecting a support frame assembly construction by taking the steel web plate part 1-1 as a support, or erecting a tower frame at the top of the middle fulcrum concrete beam section 2 for vertical rotation construction;
e. a suspender 5 is arranged between the arch rib 4 and the suspension point ear plates 1-3, and initial tensioning is carried out;
f. respectively erecting a template, binding reinforcing steel bars and pouring concrete above and below the steel web plate part 1-1 to form a concrete part 1-2, and stretching longitudinal prestressed steel bundles 1-6 in a segmented manner;
j. and (4) performing final tensioning on the suspender 5, removing the full support to perform system conversion, and performing construction for the second period to form a bridge.
In the utility model, the steel web-concrete combined box girder beam is used for replacing a concrete girder in partial girder sections, the sections have light weight, the field operation amount is less, and the construction speed is high.
The main bridge structure has the advantages of small dead weight, small support tonnage and low support manufacturing and maintenance cost, can further expand the applicable span of the continuous beam arch bridge, is beneficial to the seismic resistance of the bridge, and has wide application prospect in high-intensity seismic areas.
The arch bridge construction method comprises the steps of constructing the steel web part, and then using the steel web part as a top bottom plate for supporting and constructing the arch ribs and the concrete part, wherein the arch foot thrust generated by the self weight of the structure can be completely transmitted to the steel web part, the arch foot thrust generated by the second-stage constant load and live load is jointly born by the steel web part and the prestressed steel bundles in the concrete part, and the using amount of the prestressed steel bundles can be greatly reduced.
In the utility model, because the main beam part adopts the steel web-concrete composite beam, creep after working is smaller, the track smoothness is good, and the safety, the stability and the comfort of the high-speed train can be ensured;
the length of the side span is flexible and changeable, and if the side span has a passing clearance requirement, the corrugated steel web plate-concrete combined box girder can be adopted to increase the side span; if the side span has no passing clearance requirement, a pure concrete beam can be adopted to reduce the side span, so that the material consumption is saved.
Claims (8)
1. A continuous beam arch bridge of steel web-concrete combination box girder, includes the roof beam body, rib (4) and jib (5), its characterized in that: the beam body comprises a steel web-concrete combined box girder section (1), a concrete girder section (2) and a girder section transition combination area (3) for transitionally connecting the steel web-concrete combined box girder section and the concrete girder section (2), wherein the concrete girder section (2) is arranged near a middle fulcrum and an edge fulcrum, the steel web-concrete combined box girder section (1) is arranged at a midspan or simultaneously arranged at a midspan and an edge span, and an arch rib (4) at the midspan range is connected with the steel web-concrete combined box girder section (1) through a suspender (5).
2. A continuous girder arch bridge of steel web-concrete composite box girders according to claim 1, characterized in that: the steel web-concrete combined box girder section (1) comprises a steel web part (1-1) and a concrete part (1-2), wherein the concrete part (1-2) comprises a concrete top positioned at the top and a concrete bottom plate positioned at the bottom, the top end of the steel web part (1-1) is fixed with the lower part of the concrete top, and the upper part of the concrete bottom plate at the bottom of the steel web part (1-1) is fixed.
3. A continuous girder arch bridge of steel web-concrete composite box girders according to claim 2, characterized in that: and a lifting point ear plate (1-3) is welded at the top of the steel web part (1-1), and the lifting point ear plate (1-3) is used for fixing the suspender (5).
4. A continuous girder arch bridge of steel web-concrete composite box girders according to claim 3, characterized in that: the steel web plate part (1-1) is respectively provided with a steel diaphragm plate (1-4) at the position of a lifting point, and a manhole is arranged in each steel diaphragm plate (1-4).
5. A continuous girder arch bridge of steel web-concrete composite box girders according to claim 2, characterized in that: the steel web plate part (1-1) is connected with the concrete part (1-2) through a shear connecting piece (1-5), and the concrete part (1-2) is internally provided with prestressed steel bundles (1-6) arranged along the bridge direction.
6. A continuous girder arch bridge of steel web-concrete composite box girders according to claim 5, characterized in that: the beam section transition combination area (3) comprises a bearing plate (3-1) and a bearing plate shear connector (3-2) for fixing, and the bearing plate (3-1) anchors and fixes the prestressed steel beams (1-6) in the web plate in the concrete beam section (2).
7. A continuous girder arch bridge of steel web-concrete composite box girders according to claim 5, characterized in that: the concrete top plate and the prestressed steel bundles (1-6) in the concrete bottom plate in the steel web-concrete combined box girder section (1) and the prestressed steel bundles (1-6) in the top bottom plate in the concrete girder section (2) are arranged in a full-length and corresponding mode.
8. A continuous girder arch bridge of steel web-concrete composite box girders according to claim 2, characterized in that: the number of the steel web parts (1-1) is more than two, and the steel web parts (1-1) at the outermost sides are perpendicular/oblique to the concrete parts (1-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122653245.2U CN216515071U (en) | 2021-11-02 | 2021-11-02 | Continuous beam arch bridge of steel web-concrete combined box girder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122653245.2U CN216515071U (en) | 2021-11-02 | 2021-11-02 | Continuous beam arch bridge of steel web-concrete combined box girder |
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| CN216515071U true CN216515071U (en) | 2022-05-13 |
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| CN202122653245.2U Active CN216515071U (en) | 2021-11-02 | 2021-11-02 | Continuous beam arch bridge of steel web-concrete combined box girder |
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