CN218621755U - Steel-concrete combined structure of highway large-span hybrid combination beam - Google Patents
Steel-concrete combined structure of highway large-span hybrid combination beam Download PDFInfo
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- CN218621755U CN218621755U CN202223043818.0U CN202223043818U CN218621755U CN 218621755 U CN218621755 U CN 218621755U CN 202223043818 U CN202223043818 U CN 202223043818U CN 218621755 U CN218621755 U CN 218621755U
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Abstract
The utility model discloses a highway large-span mixes steel-concrete composite structure of composite beam, concrete box girder through setting up the same and its facade of size connects gradually, the steel-concrete composite section, steel box girder reinforcement section and steel box girder, through set up many first connecting bars and many prestressing steel strand wires between concrete box girder section and steel-concrete composite section, many first connecting bars all are the level and arrange the connection of reinforcing concrete box girder and steel-concrete composite section, improve steel-concrete composite section self bearing capacity, many prestressing steel strand wires one end all is connected with the steel grid room, the roof of concrete box girder side is connected respectively to the other end, the bottom plate, the flange plate, baffle and outer baffle, guarantee that the atress is even, the height that sets up roof T type stiffening rib and bottom plate T type stiffening rib all steadily decreases from steel-concrete composite section to steel box girder reinforcement section, in order to guarantee steel-concrete composite section, steel box girder reinforcement section, the rigidity of steel box girder section carries out smooth-riding transition.
Description
Technical Field
The utility model relates to a bridge engineering technical field, concretely relates to highway large-span mixes steel-concrete composite structure of composite beam.
Background
With the development of the traffic industry, the span of the bridge is larger and larger. The concrete bridge often has the limitation on the span because of the dead weight is big, and the steel bridge is superior to the concrete bridge in the span, but because the reason of the material, leads to its easy rust, maintenance cost height, receives the deformation that the gas temperature influences big, so just produced steel-concrete combined bridge, and the steel-concrete combined section is the rigidity sudden change point of a bridge, belongs to the control key point of bridge. Rigidity between the steel-concrete combined section of the existing highway bridge and the concrete box girder and the steel box girder is not smooth excessively, the self bearing capacity of the steel-concrete combined section is insufficient, the stress is not uniform, potential safety and quality hazards of the bridge are easily generated, and the steel-concrete combined structure is complex and not beneficial to construction. The hybrid beam is a novel bridge structure formed by longitudinally combining a steel beam and a concrete beam, and through reasonable utilization of two materials, the stress performance, the spanning capability, the economic performance and the like are greatly improved, and the hybrid beam is more and more applied to bridge construction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that current highway bridge concrete box girder and steel box girder rigidity are excessively not in the same direction as, steel-concrete combined section self bearing capacity is not enough, the atress is inhomogeneous, aim at provides a highway large-span mixes steel-concrete combined structure of combined beam, through set up many first connecting reinforcement and many prestressing force steel strand wires between concrete box girder segment and steel-concrete combined section, the connection of reinforced concrete box girder and steel-concrete combined section, improve steel-concrete combined section self bearing capacity, guarantee that the atress is even, the height that sets up roof T type stiffening rib and bottom plate T type stiffening rib all steadilys decrease to steel box girder reinforced section from steel-concrete combined section, in order to guarantee steel-concrete combined section, steel box girder reinforced section, the rigidity of steel box girder section carries out smooth-going excessively.
The utility model discloses a following technical scheme realizes:
the utility model provides a highway large-span mixes steel-concrete combined structure of combination roof beam, includes that the same and its facade of size connects gradually concrete box girder, steel-concrete combined section, steel box girder reinforced section and steel box girder:
a plurality of first connecting steel bars and a plurality of prestressed steel strands are arranged between the concrete box girder section and the reinforced concrete combined section, and the first connecting steel bars are horizontally arranged;
the steel-concrete combined top plate and the bottom plate are provided with steel lattice chambers, one ends of the prestressed steel strands are connected with the steel lattice chambers, and the other ends of the prestressed steel strands are respectively connected with the top plate, the bottom plate, the flange plate, the partition plate and the outer partition plate on the side of the concrete box girder;
the steel box girder strengthening section is provided with a top plate T-shaped stiffening rib and a bottom plate T-shaped stiffening rib, and the heights of the top plate T-shaped stiffening rib and the bottom plate T-shaped stiffening rib are gradually decreased from the reinforced concrete combining section to the steel box girder strengthening section.
The utility model discloses set up the same and concrete box girder that its facade connected gradually of size, the steel-concrete combined section, steel box girder reinforced section and steel box girder, through set up many first connecting reinforcement and many prestressing steel strand wires between concrete box girder segment and steel-concrete combined section, many first connecting reinforcement all are the connection of horizontal arrangement reinforced concrete box girder and steel-concrete combined section, improve steel-concrete combined section self bearing capacity, many prestressing steel strand wires one end all is connected with the steel check room, the roof of concrete box girder side is connected respectively to the other end, the bottom plate, the flange board, baffle and outer baffle, guarantee that the atress is even, the height that sets up roof T type stiffening rib and bottom plate T type stiffening rib all steadilys decrease to steel box girder reinforced section from steel-concrete combined section, with guaranteeing steel-concrete combined section, steel box girder reinforced section, the rigidity of steel box girder section carries out smooth-going on excessively.
Furthermore, the thickness of a top plate, a bottom plate, a web plate and a transverse partition plate which are reinforced by the steel-concrete combined section and the steel box girder is 25mm, the thickness of the top plate of the steel box girder is 16mm, and the thickness of the bottom plate, the web plate and the transverse partition plate of the steel box girder is 14mm. The rigidity of the steel-concrete combining section, the steel box girder reinforcing section and the steel box girder section is smoothly changed through the gradual change of the thickness of the steel plate.
Furthermore, the length that first connecting reinforcement one end stretched into concrete box girder is 2m, the length that the first connecting reinforcement other end stretched into the steel grating room is 750mm, the double-sided welding of first connecting reinforcement is on the steel grating room. And the reinforced concrete box girder is longitudinally connected with the steel grating chamber.
Further, the steel grating chamber is filled with self-compacting concrete, and a pouring hole, an air outlet hole and a mud jacking hole are formed in the top of the steel grating chamber. And grouting reinforcement is carried out after the concrete of the steel grating chamber is poured, so that the concrete in the steel grating chamber is ensured to be densely filled.
Furthermore, a plurality of PBL shear connectors are arranged in the steel grid chamber. The steel and the concrete are connected into a stressed whole, and the mechanical property of the structure is improved.
Furthermore, a plurality of welding nails are arranged at the top and the bottom of the steel grating chamber. The shear transfer capacity of the steel grid chamber and the concrete interface is increased, so that the load can be better transferred.
Furthermore, the prestressed steel strand is arranged in a steel strand pore channel, and the steel strand pore channel is filled with pressure slurry. And after the prestressed steel strand is tensioned, grouting the prestressed steel strand pore channel to prevent the steel strand from being corroded, and jointly stressing the steel strand and the steel lattice concrete through a grouting body.
Furthermore, be provided with the second connecting reinforcement between the steel grid room of steel-concrete combined section roof and the steel grid room of bottom plate, second connecting reinforcement (73) set up between two steel grid rooms (7), second connecting reinforcement (73) both ends are connected respectively on the side that two steel grid rooms (7) are close to each other. And the connection strength between the steel grid chambers in the steel-concrete combined section is enhanced.
Furthermore, the upper end and the lower end of the second connecting steel bar are both bent by 90 degrees. The connection stability of the second connecting steel bars and the steel grid chambers at the two ends is ensured.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the connection between the concrete box girder and the reinforced concrete combining section is enhanced by arranging a plurality of first connecting steel bars and a plurality of prestressed steel strands between the concrete box girder section and the reinforced concrete combining section, so that the self bearing capacity of the reinforced concrete combining section is improved, the uniform stress is ensured, and the heights of the T-shaped stiffening ribs of the top plate and the T-shaped stiffening ribs of the bottom plate are decreased gradually from the reinforced concrete combining section to the reinforced steel box girder section, so that the smooth transition of the rigidity of the reinforced concrete combining section, the reinforced steel box girder section and the reinforced steel box girder section is ensured;
the reinforced concrete combined section has the advantages of simple structure, convenience and quickness in construction and strong bearing capacity, can realize the smoothness of the rigidity of the concrete beam and the steel beam, and improves the safety quality of the bridge.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a longitudinal sectional view of the steel-concrete composite structure according to an embodiment of the present invention;
fig. 2 is a plan view of the steel-concrete combined structure integral top plate in the embodiment of the present invention;
fig. 3 is an enlarged view of the steel grid in the embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
1. a concrete box girder; 2. a steel-concrete combined section; 3. a steel box girder reinforcing section; 4. a steel box girder; 5. a first connecting bar; 6. pre-stressed steel strands; 7. a steel cell; 71. a PBL shear key; 72. welding nails; 73. a second connecting reinforcement; 8. a top plate T-shaped stiffener; 9. a bottom plate T-shaped stiffening rib.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
As shown in fig. 1 and fig. 2, the embodiment 1 provides a steel-concrete combined structure of a road large-span hybrid combined beam, which includes a concrete box beam 1, a steel-concrete combined section 2, a steel box beam reinforced section 3 and a steel box beam 4, which have the same size and vertical surfaces connected in sequence:
a plurality of first connecting steel bars 5 and a plurality of prestressed steel strands 6 are arranged between the concrete box girder 1 section and the reinforced concrete combining section 2, and the plurality of first connecting steel bars 5 are horizontally arranged;
the top plate and the bottom plate of the steel-concrete combining section 2 are both provided with steel grid chambers 7, one ends of a plurality of prestressed steel strands 6 are connected with the steel grid chambers 7, and the other ends of the plurality of prestressed steel strands 6 are respectively connected with the top plate, the bottom plate, the flange plate, the partition plate and the outer partition plate on the side of the concrete box girder 1;
the steel box girder reinforcing section 3 is provided with a top plate T-shaped stiffening rib 8 and a bottom plate T-shaped stiffening rib 9, and the heights of the top plate T-shaped stiffening rib 8 and the bottom plate T-shaped stiffening rib 9 are gradually decreased from the steel-concrete combining section 2 to the steel box girder reinforcing section 3.
Through setting up the same and concrete box girder 1 that its facade connected gradually of size, steel-concrete combined section 2, steel box girder reinforced section 3 and steel box girder 4, set up many first connecting reinforcement 5 and many prestressing steel strand wires 6 between concrete box girder 1 section and steel-concrete combined section 2, many first connecting reinforcement 5 all are the connection of horizontal arrangement reinforced concrete box girder 1 and steel-concrete combined section 2, improve steel-concrete combined section 2 self bearing capacity, many prestressing steel strand wires 6 one end all are connected with steel grid 7, the roof of concrete box girder 1 side is connected respectively to the other end, the bottom plate, the flange board, baffle and outer baffle, guarantee that the atress is even, the height that sets up roof T type stiffening rib 8 and bottom plate T type stiffening rib 9 all subtracts progressively from steel-concrete combined section 2 to steel box girder reinforced section 3, in order to guarantee steel-concrete combined section 2, steel box girder 3, the rigidity of steel box girder 4 section carries out smooth-going on excessively.
In some possible embodiments, the steel-concrete combining section 2 is two meters long, the steel box girder reinforcing section 3 is 3.5 meters long, the steel box girder 4 is made of low-alloy high-strength structural steel Q345C, the concrete box girder 1 is made of C55 concrete, and the prestressed steel strands 6 are made of high-strength low-relaxation steel strands.
In some possible embodiments, the thicknesses of the top plate, the bottom plate, the web plate and the transverse partition plate of the steel-concrete combining section 2 and the steel box girder reinforcing section 3 are all 25mm, the thickness of the top plate of the steel box girder 4 is 16mm, and the thicknesses of the bottom plate, the web plate and the transverse partition plate of the steel box girder 4 are all 14mm. The rigidity of the steel-concrete combining section 2, the steel box girder reinforcing section 3 and the steel box girder 4 is smoothly changed by gradually changing the thickness of the steel plate.
In some possible embodiments, the length of the first connecting reinforcement 5 extending into the concrete box girder 1 at one end is 2m, the length of the first connecting reinforcement 5 extending into the steel cell 7 at the other end is 750mm, and the first connecting reinforcement 5 is welded on both sides to the steel cell 7. And the reinforced concrete box girder 1 is longitudinally connected with the steel grid chamber 7.
As shown in figure 3, the steel-concrete combined section is 2m long, is a transition section for converting the concrete box girder 1 to the steel box girder 4, in order to avoid overlarge rigidity change of the main girder, the thicknesses of a top plate, a bottom plate, a web plate and a pressure bearing plate of the steel lattice chamber 7 are all 25mm, the steel lattice chamber 7 is filled with concrete, and the top plate and the bottom plate of the steel lattice chamber 7 are arranged
And the welding nails 72 increase the shear transfer capacity of the interface between the steel grating chamber 7 and the concrete, so that the load can be better transferred. The web plate is provided with an upper opening
Round hole, and penetrate 225mm long
HRB400E steel bars and concrete entering the round hole are wrapped together to form the reinforced concrete PBL shear key 71. The steel and the concrete are connected into a stressed whole, and the mechanical property of the structure is improved.
In order to ensure that concrete can freely flow in the steel grid chamber 7 and the PBL shear key 71 holes when the concrete is poured, pouring holes are formed in the top plate, the partition plate is provided with communicating holes, and the particle size of the coarse aggregate of the concrete is limited to be less than 20mm; in order to ensure that concrete in the steel grating chamber 7 is filled compactly, a pouring hole, an air outlet hole and a mud jacking hole are reserved at the top plate of the steel grating chamber 7, and mud jacking reinforcement is carried out after the concrete in the steel grating chamber 7 is poured; and after the concrete pouring is finished, sealing and welding the pouring hole. After the concrete filling construction is finished, the concrete in the steel grating chamber 7 is checked whether to be completely full by adopting geophysical prospecting means such as ultrasonic waves and the like, and then the next construction can be carried out. If the incompact position is found, the drilling mud jacking is adopted for reinforcing, and the drilling hole is plugged again after the completion.
In some possible embodiments, prestressed steel strands 6 extend from the top plate, the bottom plate, the flange plate, the partition plate and the outer partition plate on the side of the concrete box girder 1, and the steel strands penetrate through the steel cells 7 and are fixed on the bearing plates of the webs of the steel cells 7. The steel strand is single-end tensioned, the fixed end is the bearing plate, and the tensioning end is the concrete box girder 1. And tensioning by adopting a post-tensioning method, and performing single-end tensioning on the side of the concrete box girder 1 after the concrete pouring of the steel grid chamber 7 is finished and the strength, the elastic modulus and the age of the concrete meet the requirements. Tension adopts double control, tension control is taken as a main mode, and extension control is taken as an auxiliary mode. And after tensioning is finished, grouting treatment is carried out on the prestressed steel strand 6 pore channel to prevent the steel strand from being corroded, and the steel strand and concrete of the steel grid chamber 7 are stressed together through a grouting body.
In some possible embodiments, the first connecting steel bar 5 is arranged at the intersection of the concrete box girder 1 section and the steel-concrete combined section 2, and the HRB400E steel bar with the diameter of 32mm is adopted as the first connecting steel bar 5. The first connecting bars 5 are arranged horizontally. The length of the first connecting reinforcing steel bar 5 extending into the concrete box girder 1 is 2m, and the first connecting reinforcing steel bar is effectively connected with the reinforcing steel bar in the concrete box girder 1 so as to reinforce the longitudinal connection between the concrete box girder 1 and the steel grid chamber 7. The length that first connecting reinforcement 5 stretched into steel grating room 7 is 750mm to two-sided welding is on steel grating room 7 wallboard, with the longitudinal connection of reinforcing concrete box girder 1 and steel grating room 7, strengthens the joint strength between the inside steel grating room 7 of steel-concrete combined section 2.
Set up second connecting reinforcement 73 between two steel grating rooms 7 to strengthen the vertical connection of two steel grating rooms 7, second connecting reinforcement 73 adopts the HRB400E reinforcing bar that the diameter is 32 mm. The second connecting steel bars 73 are vertically arranged, the upper end of the second connecting steel bars penetrates through the bottom plate of the steel lattice chamber 7 of the top plate of the steel-concrete combined section 2, and the lower end of the second connecting steel bars penetrates through the top plate of the steel lattice chamber 7 of the bottom plate of the steel-concrete combined section 2. The upper and lower ends of the second connecting reinforcing steel bar 73 are bent at 90 degrees, and the length of the hook is 30cm. The connection stability of the second connecting reinforcing steel bar 73 and the two-end steel grating chambers 7 is ensured.
For making things convenient for later stage to detect the use, steel-concrete combined section 2 sets up 4 vertical people's holes altogether at the limit room of crossbeam and secondary limit room, and the well room does not set up people's hole, and concrete box girder 1 and steel box girder 4 all set up 5 vertical people's holes.
A steel-concrete combining section 2 and a steel box girder reinforcing section 3 are arranged between a concrete box girder 1 and a steel box girder 4; arranging a steel grid chamber 7 in the reinforced concrete combined section 2, and filling concrete in the steel grid chamber 7; welding nails 72 and reinforced concrete PBL shear keys 71 are arranged in the steel grating chambers 7; the steel grating chamber 7 is provided with a grouting hole and an exhaust hole; set up prestressing steel strand 6, first connecting reinforcement 5, second connecting reinforcement 73, roof T type stiffener 8 and bottom plate T type stiffener 9 simultaneously. Through the measures, the concrete box girder 1 section, the steel-concrete combining section 2, the steel box girder reinforcing section 3 and the steel box girder 4 section can form a whole to bear force together, and the problems that the original steel-concrete combining section 2 is complex in structure, not beneficial to construction, insufficient in bearing capacity and excessive and unsmooth in rigidity of the concrete box girder 1 and the steel box girder 4 can be solved.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a highway large-span mixes steel-concrete combined structure of combination roof beam which characterized in that, includes that the same and its facade of size connects gradually concrete box beam (1), steel-concrete combined section (2), steel box beam reinforcement section (3) and steel box beam (4):
a plurality of first connecting steel bars (5) and a plurality of prestressed steel strands (6) are arranged between the concrete box girder (1) section and the reinforced concrete combining section (2), and the first connecting steel bars (5) are horizontally arranged;
the top plate and the bottom plate of the reinforced concrete combining section (2) are both provided with steel lattice chambers (7), one ends of the prestressed steel strands (6) are connected with the steel lattice chambers (7), and the other ends of the prestressed steel strands (6) are respectively connected with the top plate, the bottom plate, the flange plate, the partition plate and the outer partition plate on the side of the concrete box girder (1);
the steel box girder reinforcing section (3) is provided with a top plate T-shaped stiffening rib (8) and a bottom plate T-shaped stiffening rib (9), and the heights of the top plate T-shaped stiffening rib (8) and the bottom plate T-shaped stiffening rib (9) are gradually decreased from the steel-concrete combination section (2) to the steel box girder reinforcing section (3).
2. The steel-concrete combined structure of the road long-span hybrid combination beam according to claim 1, wherein the thicknesses of the top plate, the bottom plate, the web plate and the diaphragm of the steel-concrete combined section (2) and the steel box beam reinforcing section (3) are all 25mm, the thickness of the top plate of the steel box beam (4) is 16mm, and the thicknesses of the bottom plate, the web plate and the diaphragm of the steel box beam (4) are all 14mm.
3. The steel-concrete combined structure of the road long-span hybrid combination beam according to claim 1, wherein one end of the first connection reinforcement (5) is extended into the concrete box girder (1) by a length of 2m, and the other end of the first connection reinforcement (5) is extended into the steel grating chamber (7) by a length of 750mm.
4. The steel-concrete composite structure of the highway large-span hybrid composite beam according to claim 3, wherein the first connecting reinforcing steel bars (5) are welded on both sides of the steel grating chambers (7).
5. The steel-concrete combined structure of the road long-span hybrid combined beam according to claim 1, wherein the steel grating chambers (7) are filled with self-compacting concrete, and the top of the steel grating chambers (7) are provided with pouring holes, air outlet holes and grouting holes.
6. The steel-concrete composite structure of the road large-span hybrid composite beam according to claim 5, wherein a plurality of PBL shear keys (71) are arranged in the steel cells (7).
7. The steel-concrete composite structure of the highway large-span hybrid composite beam according to claim 6, wherein the top and the bottom of the steel lattice chamber (7) are provided with a plurality of welding studs (72).
8. The steel-concrete composite structure of the road long-span hybrid composite beam according to claim 1, wherein the prestressed steel strands (6) are arranged in a steel strand tunnel filled with pressure slurry.
9. The steel-concrete combined structure of the road long-span hybrid combination beam according to claim 1, wherein a second connecting steel bar (73) is arranged between the steel lattice chambers (7) of the top plate and the steel lattice chambers (7) of the bottom plate of the steel-concrete combined section (2), the second connecting steel bar (73) is arranged between the two steel lattice chambers (7), and two ends of the second connecting steel bar (73) are respectively connected to one side surface of the two steel lattice chambers (7) close to each other.
10. The steel-concrete composite structure of a road long-span hybrid composite beam according to claim 9, wherein upper and lower ends of the second connecting reinforcing bars (73) are bent by 90 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223043818.0U CN218621755U (en) | 2022-11-16 | 2022-11-16 | Steel-concrete combined structure of highway large-span hybrid combination beam |
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| CN202223043818.0U CN218621755U (en) | 2022-11-16 | 2022-11-16 | Steel-concrete combined structure of highway large-span hybrid combination beam |
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