CN212223579U - Steel-ultra-high performance concrete composite bridge structure suitable for medium and small span - Google Patents
Steel-ultra-high performance concrete composite bridge structure suitable for medium and small span Download PDFInfo
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- CN212223579U CN212223579U CN202020785436.7U CN202020785436U CN212223579U CN 212223579 U CN212223579 U CN 212223579U CN 202020785436 U CN202020785436 U CN 202020785436U CN 212223579 U CN212223579 U CN 212223579U
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Abstract
A steel-ultra high performance concrete composite bridge structure suitable for medium and small span comprises a plurality of composite beam units which are transversely and longitudinally arranged, wherein each composite beam unit comprises a lower steel beam structure and a bridge deck supported on the lower steel beam structure; the lower steel beam structure comprises two or more I-shaped steel beams and a transverse connecting structure, wherein the I-shaped steel beams are longitudinally arranged along the bridge, and the tops of the I-shaped steel beams are connected with the bridge deck into a whole through shear connectors; the transverse connecting structure is transversely arranged between the adjacent I-shaped steel beams. The utility model has the advantages of reducing the dead weight of the bridge structure, controlling the height of the beam, reducing the difficulty of transportation and erection of the prefabricated bridge, having fewer construction processes and effectively accelerating the construction speed; on the other hand, the excellent performance of the ultra-high performance concrete is utilized to improve the durability of the bridge structure.
Description
Technical Field
The utility model belongs to bridge structures building field, in particular to steel-ultra high performance concrete composite bridge structures suitable for little span in.
Background
The existing small and medium span bridges widely adopt common concrete precast beam bridges, and the common concrete beam bridges have the defects of heavy self weight, complex prestress construction, low tensile strength and poor durability. Meanwhile, the beam height is not easy to control when the span is large, so that the common concrete precast beam bridge is not suitable for the urban bridge with strict beam height requirement.
The common steel-concrete combined beam bridge effectively overcomes the defects that the common concrete beam bridge has a great self weight and the beam height is not easy to control. Meanwhile, the steel-concrete combined beam bridge has the advantages of convenience in prefabrication and erection, environmental friendliness and capability of fully exerting the respective performances of steel and concrete materials. However, for the bridge which needs to be erected quickly and has higher requirement on durability, the common steel-concrete composite bridge still has the problems of poor durability and complex structure in a hogging moment area due to the existence of tensile stress.
The ultra-high performance concrete is a cement-based composite material with ultra-high strength, toughness and ultra-long durability, has excellent mechanical properties, particularly higher tensile strength, and can effectively solve the problems of complex structure, poor durability and the like of a hogging moment area of a steel-concrete composite beam bridge. Therefore, the adoption of the ultra-high performance concrete bridge deck slab to replace the common concrete bridge deck slab has the rationality. However, how to combine the ultra-high performance concrete deck with the steel beam to form a structure which is easy to erect and construct and has excellent durability is a technical problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the above-mentioned not enough of prior art and providing a steel-ultra high performance concrete composite bridge structure that dead weight is light, convenient transportation erects, the construction is quick, the durability is good, be applicable to well little span.
The technical scheme of the utility model is that: a steel-ultra high performance concrete composite bridge structure suitable for medium and small span comprises a plurality of composite beam units which are transversely and longitudinally arranged, wherein each composite beam unit comprises a lower steel beam structure and a bridge deck supported on the lower steel beam structure; the lower steel beam structure comprises two or more I-shaped steel beams and a transverse connecting structure, wherein the I-shaped steel beams are longitudinally arranged along the bridge, and the tops of the I-shaped steel beams are connected with the bridge deck into a whole through shear connectors; the transverse connecting structure is transversely arranged between the adjacent I-shaped steel beams.
Further, the bridge deck is formed by pouring ultrahigh-performance concrete.
Further, the I-shaped steel beam comprises an I-shaped steel beam top plate, an I-shaped steel beam bottom plate and an I-shaped steel beam web plate arranged between the I-shaped steel beam top plate and the I-shaped steel beam bottom plate; the shear connecting piece is welded on the upper part of the top plate of the I-shaped steel beam.
Further, the shear connecting piece is a shear nail welded on the top plate of the I-shaped steel beam; at least two rows of shear nails are longitudinally welded on the top plate of each I-shaped steel beam, and each row of shear nails are uniformly arranged along the bridge length direction.
The transverse connecting structure comprises a stiffening plate welded on the web plate of the I-shaped steel beam and a cross beam welded or connected with the stiffening plate through bolts.
The thickness of the deck slab near the beam ends is greater than the thickness of the deck slab elsewhere.
The thickness of the bridge deck plate is transited to 24-30 cm from 10-15 cm in the midspan to 24-30 cm at the beam end; correspondingly, the height of the lower steel beam structure is transited to 65-75 cm from 80-90 cm in the span to the beam end.
The I-shaped steel beam is a welded steel beam or hot-rolled section steel.
The beam is a solid web type, truss type or fishtail plate type beam.
The I-shaped steel beam is manufactured in sections, and the sections are connected through welding or bolts.
The utility model has the advantages that:
(1) the bridge deck is formed by pouring ultrahigh-performance concrete, the dead weight of a bridge structure can be obviously reduced, the transportation and erection difficulty of a prefabricated bridge is reduced, meanwhile, the construction procedures are fewer, and the construction speed can be effectively accelerated.
(2) The thickness of the ultra-high performance concrete bridge deck slab is thickened at the beam end, and the excellent tensile property of the ultra-high performance concrete is achieved, so that the tensile stress of the bridge deck slab in the hogging moment area at the beam end is controlled within the designed tensile strength, the prestress of a common steel-concrete combined beam bridge is eliminated, and the construction process of the hogging moment area is simplified.
(3) The excellent mechanical properties of the ultra-high performance concrete and steel are fully exerted, the height of the beam is controlled in a lower range, the durability is excellent, and the urban grade separation system has a wider development space.
(4) The bridge is transversely and longitudinally decomposed into a plurality of combined beam units, the combined beam units are prefabricated in a prefabrication factory and then are directly hoisted in place, and the combined beam units can be divided according to construction capacity due to light self weight, so that the construction and erection are easy.
(5) The top of the I-shaped steel beam is connected with the bridge deck into a whole through the shear connector, and the transverse connecting structure is arranged between the adjacent I-shaped steel beams, so that the structural stability of the I-shaped steel beams can be greatly improved.
Drawings
Fig. 1 is a schematic view of a half-span structure of a composite beam unit according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a composite beam unit according to an embodiment of the present invention.
Illustration of the drawings:
1. a lower steel beam structure; 2. a bridge deck; 3. an I-shaped steel beam; 4. a transverse connection structure; 31. an I-shaped steel beam bottom plate; 32. an I-shaped steel beam web; 33. an I-shaped steel beam top plate; 34. a shear connector; 41. a stiffening plate; 42. a cross member.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific examples.
As shown in fig. 1 and 2: a steel-ultra high performance concrete composite bridge structure suitable for medium and small span comprises a plurality of transverse and longitudinal composite beam units, each composite beam unit comprises a lower steel beam structure 1 and a bridge deck 2 supported on the lower steel beam structure 1, and the lower steel beam structure 1 comprises two or more I-shaped steel beams 3 and transverse connecting structures 4 which are arranged along the longitudinal direction of a bridge. The top of the I-shaped steel beam 3 is connected with the bridge deck 2 into a whole through a shear connector 34; the transverse connecting structure 4 is transversely arranged between the adjacent I-shaped steel beams 3.
In this embodiment, the i-shaped steel beam includes an i-shaped steel beam top plate 33, an i-shaped steel beam bottom plate 31, and an i-shaped steel beam web 32 welded between the i-shaped steel beam top plate 33 and the i-shaped steel beam bottom plate 31. The upper part of the I-shaped steel girder top plate 33 is welded with a shear connector 34, and the bridge deck 2 and the lower steel girder structure 1 are connected into a whole through the shear connector 34.
Specifically, the deck slab is disposed on the i-beam roof 33 and connected to form a whole by the shear connector 34. The shear connectors 34 are shear nails, two rows of shear nails are longitudinally welded on each H-shaped steel beam top plate 33, each row of shear nails are uniformly arranged along the bridge length direction, the longitudinal distance between every two adjacent shear nails is 15cm, and the transverse distance is 13cm, so that the H-shaped steel beams 3 and the bridge deck 2 are reliably bonded, and interlayer slippage is prevented.
In this embodiment, the transverse connection structure 4 is disposed in the midspan. The transverse connecting structure 4 includes stiffening plates 41 welded to the i-shaped steel beam web 32 and cross beams 42 welded or bolted to the stiffening plates 41. The cross member 42 is a solid web, truss or fishplate structure, and the cross member in this embodiment is preferably an i-shaped solid web steel beam. Through setting up transverse connection structure, can improve I-shaped steel beam 3's structural stability. The stiffening plates 41 include longitudinal stiffening plates and transverse stiffening plates, are connected to the i-shaped steel beam web 32, and are both perpendicular to the i-shaped steel beam web. The stiffener plate 41 may pass through the i-beam web 32 or may be attached to only one side of the i-beam web 32.
In the embodiment, the total length of the bridge is 100m, the total span is four spans, and the single span diameter is 25 m. The beam unit is divided into 3 combined beam units in the transverse direction, 4 combined beam units in the longitudinal direction and 12 combined beam units in total, and the beam units are connected through seams.
In this embodiment, the deck slab is thickened at locations near the beam ends. The single composite beam element has a longitudinal length of 25m and a transverse length of 2.8 m. The thickness of the bridge deck 2 is transited from 12cm in the midspan to 26cm at the beam end; correspondingly, the height of the lower steel beam structure 1 is transited from 88cm in the span to 75cm at the beam end, and the length of the transition section is 1 m. In the hogging moment area, the bridge deck is pulled and the steel beam is compressed, in the middle and small span bridge, the tensile stress of the bridge deck can be obviously reduced to be within the designed tensile strength of the ultra-high performance concrete through thickening the ultra-high performance concrete bridge deck, and the thinner ultra-high performance concrete bridge deck can be arranged on the rest of the concrete under compression, so that the manufacturing cost is reduced.
In the present embodiment, the i-beam 3 of the composite beam unit is divided into four sections in the longitudinal direction according to the design calculation result, and the thickness of the i-beam floor of each section is determined according to the calculation result. The steel consumption can be effectively reduced by setting the steel consumption into a sectional type.
The construction method of the steel-ultrahigh performance concrete combined bridge structure of the embodiment has two types:
a first construction method comprising the steps of:
s101, manufacturing I-shaped steel beam sections in a steel structure processing plant, splicing the I-shaped steel beam sections into an I-shaped steel beam 3 in a prefabrication field, welding the shear connectors 34 on the top plate 33 of the I-shaped steel beam, welding the stiffening plates 41 of the web plate 32 of the I-shaped steel beam, and connecting the stiffening plates 41 and the cross beam 42 to form a lower steel beam structure, wherein the concrete steps are as follows:
s101.1, welding an I-shaped steel beam top plate 33, an I-shaped steel beam bottom plate 31 and an I-shaped steel beam web plate 32 in a factory to form an I-shaped steel beam section and sending the I-shaped steel beam section to a composite beam prefabricating factory;
s101.2, welding I-shaped steel beam sections in a prefabrication factory, and then welding the shear connectors 34 on the I-shaped steel beam top plate 33, the stiffening plates 41 perpendicular to the I-shaped steel beam web plate 32 and the cross beams 42 to form a lower steel beam structure;
s102, erecting a bridge deck template on the prefabricated site pedestal and the steel beam, installing bridge deck steel bars, pouring ultrahigh-performance concrete and maintaining according to design requirements to form a combined beam unit;
s103, hoisting the combined beam unit in place, and constructing joints;
and S104, roughening the bridge deck 2, pouring an anti-collision guardrail and installing auxiliary facilities to form a bridge. The bridge deck is roughened, so that bridge deck pavement is omitted, and the self weight of the bridge is further reduced; meanwhile, due to the ultrahigh toughness of the bridge deck, the cracking risk of the bridge deck is greatly reduced, and the operation cost is reduced.
The second construction method is to prefabricate the lower steel beam structure, and cast the ultra-high performance concrete in situ to form a whole after hoisting in place, and specifically comprises the following steps:
s201, manufacturing I-shaped steel beam sections in a steel structure processing plant, splicing the I-shaped steel beam sections in a prefabrication field into I-shaped steel beams 3, welding the shear connectors 34 on the I-shaped steel beam top plates 33, welding the stiffening plates 41 of the I-shaped steel beam web plates 32, and connecting the stiffening plates 41 and the cross beams 42 to form a lower steel beam structure.
And S202, hoisting the lower steel beam structure 1 in place, erecting a bridge deck formwork, and pouring ultrahigh-performance concrete in the formwork to form a combined beam unit.
S203, roughening the bridge deck 2, pouring an anti-collision guardrail and installing auxiliary facilities to form a bridge.
The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting the invention in any way. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A steel-ultra high performance concrete composite bridge structure suitable for medium and small span is characterized by comprising a plurality of composite beam units which are transversely and longitudinally arranged, wherein each composite beam unit comprises a lower steel beam structure (1) and a bridge deck (2) supported on the lower steel beam structure (1); the lower steel beam structure (1) comprises two or more I-shaped steel beams (3) and transverse connecting structures (4), wherein the I-shaped steel beams (3) are longitudinally arranged along the bridge, and the tops of the I-shaped steel beams (3) are connected with the bridge deck (2) into a whole through shear connectors (34); the transverse connecting structure (4) is transversely arranged between the adjacent I-shaped steel beams (3).
2. The steel-ultra high performance concrete composite bridge structure for medium and small spans according to claim 1, wherein the bridge deck (2) is constructed by ultra high performance concrete pouring.
3. The steel-ultra high performance concrete composite bridge structure suitable for medium and small span according to claim 1 or 2, wherein the i-shaped steel beam (3) comprises an i-shaped steel beam top plate (33), an i-shaped steel beam bottom plate (31), and an i-shaped steel beam web (32) disposed between the i-shaped steel beam top plate (33) and the i-shaped steel beam bottom plate (31); the shear connector (34) is welded to the upper part of the I-shaped steel beam top plate (33).
4. The steel-ultra high performance concrete composite bridge structure suitable for medium and small spans according to claim 3, wherein the shear connectors (34) are shear nails welded on the top plate (33) of the I-shaped steel beam; at least two rows of shear nails are longitudinally welded on each I-shaped steel beam top plate (33), and each row of shear nails are uniformly arranged along the bridge length direction.
5. The steel-ultra high performance concrete composite bridge structure suitable for medium and small spans according to claim 3, wherein the transverse connection structure (4) comprises stiffening plates (41) welded to the I-shaped steel beam web (32) and cross beams (42) welded or bolted to the stiffening plates (41).
6. The steel-ultra high performance concrete composite bridge structure for medium and small spans according to claim 1 or 2, wherein the thickness of the bridge deck (2) is greater at a position near the beam end than at other positions of the bridge deck.
7. The steel-ultra high performance concrete composite bridge structure suitable for medium and small spans according to claim 6, wherein the thickness of the bridge deck slab (2) is transited from 10-15 cm in the span to 24-30 cm at the beam end; correspondingly, the height of the lower steel beam structure (1) is transited to 65-75 cm from 80-90 cm in the span to the beam end.
8. The steel-ultra high performance concrete composite bridge structure for medium and small span according to claim 1 or 2, wherein the i-shaped steel beam (3) is a welded steel beam or a hot rolled steel beam.
9. The steel-ultra high performance concrete composite bridge structure suitable for medium and small spans according to claim 5, wherein the cross beams (42) are solid web type, truss type or fishplate type cross beams.
10. The steel-ultra high performance concrete composite bridge structure for medium and small span according to claim 1 or 2, wherein the i-shaped steel beam (3) is fabricated in sections, and the sections are connected by welding or bolts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020785436.7U CN212223579U (en) | 2020-05-13 | 2020-05-13 | Steel-ultra-high performance concrete composite bridge structure suitable for medium and small span |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020785436.7U CN212223579U (en) | 2020-05-13 | 2020-05-13 | Steel-ultra-high performance concrete composite bridge structure suitable for medium and small span |
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