CN111778849A - But bridge floor structure of subregion restraint UHPC - Google Patents
But bridge floor structure of subregion restraint UHPC Download PDFInfo
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- CN111778849A CN111778849A CN202010795877.XA CN202010795877A CN111778849A CN 111778849 A CN111778849 A CN 111778849A CN 202010795877 A CN202010795877 A CN 202010795877A CN 111778849 A CN111778849 A CN 111778849A
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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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- Bridges Or Land Bridges (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to the field of bridge structures, and particularly relates to a bridge deck structure capable of restraining UHPC in a partitioned mode, which comprises an orthotropic plate, wherein a plurality of longitudinal ribs and transverse ribs which are vertical to each other in the longitudinal direction and the transverse direction are arranged on the orthotropic plate, at least 1 shear resistant part is arranged in any lattice region formed by the transverse ribs and the longitudinal ribs, UHPC thin layers with the expansion rate not less than 0.2% are paved on the orthotropic plate, the transverse ribs, the longitudinal ribs and the shear resistant parts, and the bridge deck structure adopts the vertical ribs, the transverse ribs and the shear resistant parts which are vertical to each other in the longitudinal direction and the transverse direction to replace densely distributed stud groups, so that the shear connection degree between the UHPC thin layers and the orthotropic plate is higher, and the combination is tighter. The lattice area formed by the longitudinal ribs and the transverse ribs can effectively restrain the UHPC thin layer with the expansion rate not less than 0.2%, so that the UHPC thin layer forms self-prestress, and further the superior mechanical property of the UHPC is fully exerted.
Description
Technical Field
The invention belongs to the field of bridge structures, and particularly relates to a bridge deck structure capable of restraining UHPC in a partitioned mode.
Background
At present, steel bridge deck slabs are generally paved by asphalt. A large number of engineering practices show that the bridge deck system of 'steel bridge deck and asphalt pavement' is easy to have the following two diseases in operation: (1) under the action of a high-frequency heavy-load travelling crane, fatigue cracking easily occurs at the welding seam position of the steel bridge deck, the detection and reinforcement cost of the steel bridge deck is increased, and even the safety of the bridge can be endangered when the cracking is serious; (2) under the coupling effect of factors such as heavy-duty car, temperature, rainwater, steel bridge deck asphalt pavement layer frequently damaged, the asphalt pavement layer of domestic individual steel bridge is in damaged and repair state even throughout the year, and this type of disease has increased the maintenance cost of steel bridge deck pavement, and is unfavorable for security and the travelling comfort of driving.
In order to solve the problems of fatigue damage of steel bridge deck slab and easy damage of bridge deck pavement layer, researchers at home and abroad try to replace the asphalt pavement layer with an Ultra High Performance Concrete (UHPC) layer with excellent mechanical properties so as to improve the rigidity of the steel bridge deck and the stress state of the steel bridge deck, for example: the steel-UHPC light combined bridge deck structure can effectively improve the local rigidity of a steel bridge deck, effectively reduce the stress level of the steel bridge deck and relieve the fatigue cracking problem of the bridge deck system to a certain degree. However, the orthotropic steel plate of the composite bridge deck structure needs to be welded with a large number of dense studs, the weld toes of the studs are easy to become new fatigue details, and the high stud shear keys limit the further reduction of the thickness of the UHPC layer. The dense stud groups increase the construction difficulty, and have enough constraint on the lack of the UHPC layer, so that the superior mechanical property of the UHPC cannot be fully exerted. In addition, the UHPC thin layer in the combined bridge deck slab cannot be prefabricated in a prefabricating factory and can only be poured in situ.
The patent number is ZL201620292456.4, and the name is: the chinese utility model patent of "an orthotropic combination decking of area semi-closed groove trompil board" discloses a combination decking, but the semi-closed groove trompil board among this combination decking can not form effectual self-prestressing force to its inside concrete, can't overcome the concrete decking problem of easily cracking. In addition, keep away from the regional shearing resistant piece that does not set up of perforated plate for concrete slab and steel sheet are unable effective combination, easily take place the problem of fatigue disease and the layer fracture of mating formation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bridge deck structure which has high combination degree of a UHPC thin layer and an orthotropic plate and compact structure and can regionally restrain UHPC.
The invention relates to an orthotropic plate, which is provided with a plurality of longitudinal ribs and transverse ribs which are vertical to each other in the longitudinal direction and the transverse direction, wherein at least 1 shear part is arranged in any lattice region formed by the transverse ribs and the longitudinal ribs, UHPC thin layers with expansion rate not less than 0.2% are paved on the orthotropic plate, the transverse ribs, the longitudinal ribs and the shear parts, the transverse ribs and the longitudinal ribs are perforated plates, and longitudinal steel bars and transverse steel bars which are vertical to each other in the longitudinal direction and the transverse direction are respectively arranged at the perforated positions of the transverse ribs and the longitudinal ribs.
Further, the thin layer expansion rate of the UHPC is between 0.2% and 1.2%.
Further, the thin layer of UHPC has a thickness of 50-80 mm.
Furthermore, the height of the transverse ribs and the longitudinal ribs is 40-60mm, and the thickness of the transverse ribs and the longitudinal ribs is 3-8 mm.
Further, the transverse ribs and the longitudinal ribs are linear plates or corrugated plates.
Furthermore, at least 2 transverse steel bars are arranged between every two adjacent transverse ribs, and at least 2 longitudinal steel bars are arranged between every two adjacent longitudinal ribs.
Furthermore, the diameter of the opening of the transverse rib and the longitudinal rib is 20-40mm, and the diameter of the longitudinal steel bar and the transverse steel bar is 8-20 mm.
Furthermore, 1-8 shear-resistant pieces are arranged in any lattice region formed by the transverse ribs and the longitudinal ribs.
Further, the shear resistant members are pegs.
The bridge deck structure has the beneficial effects that the densely distributed stud groups are replaced by the longitudinal ribs, the transverse ribs and the shearing resistant pieces which are vertical to each other in the longitudinal direction and the transverse direction, so that the UHPC thin layer and the orthotropic plate can be connected in a shearing manner to a higher degree and can be combined more tightly. The lattice area formed by the longitudinal ribs and the transverse ribs can effectively restrain the UHPC thin layer with the expansion rate not less than 0.2 percent, so that the UHPC thin layer forms self-prestress, the superior mechanical property of the UHPC is fully exerted, and the problems that the existing steel bridge deck system is easy to generate fatigue diseases and the pavement layer is cracked are solved. According to the actual needs of the site, the invention can adopt a cast-in-place or prefabricated method to construct the UHPC thin layer. The thickness of the UHPC thin layer is small, the dead weight can be effectively reduced, the requirement of an ultra-large span bridge on the light dead weight is met, the transverse ribs and the longitudinal ribs are perforated plates, longitudinal steel bars and transverse steel bars which are vertical to each other and transverse to each other are arranged at the perforated positions of the transverse ribs and the longitudinal ribs respectively, and effective PBL connecting pieces can be formed.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a sectional view taken along line a-a in fig. 1.
Fig. 3 is a sectional view taken along line B-B in fig. 1.
In the figure, 1-top plate, 2-UHPC thin layer, 3-transverse rib, 4-longitudinal rib, 5-shearing resistant piece, 6-longitudinal reinforcing steel bar, 7-transverse reinforcing steel bar, 8-longitudinal U rib and 9-transverse clapboard.
Detailed Description
As shown in figures 1-3, the invention comprises an orthotropic plate, the orthotropic plate comprises a top plate 1, longitudinal U ribs 8 and transverse partition plates 9 which are arranged below the top plate 1 and are vertical to each other in the longitudinal and transverse directions, the orthotropic plate is provided with a plurality of longitudinal ribs 4 and transverse ribs 3 which are vertical to each other in the longitudinal and transverse directions, the distance between the longitudinal ribs 4 is 1000-3000mm, the distance between the transverse ribs 3 is 1000-3000mm, each transverse rib 3 is preferably 2000mm, the lattice structure can effectively restrain a UHPC thin layer, at least 1 shear resistant member 5 is arranged in any lattice structure area formed by the transverse ribs 3 and the longitudinal ribs 4, the height of the shear resistant member 5 is 30-50mm, UHPC thin layers 2 with the expansion rate not less than 0.2% are paved on the orthotropic plate, the transverse ribs 3, the longitudinal ribs 4 and the shear resistant members 5, the UHPC thin layers 2 are formed by ultra-high performance concrete, the axial compression strength of the ultra-high performance concrete is more than 120MPa, the axial tensile strength is more than 8MPa, the volume mixing amount of the steel fiber is 1.5-4%, the expansion rate is not less than 0.2%, and the steel fiber has the advantages of ultrahigh compressive strength, higher tensile strength, good toughness and wear resistance and the like.
The longitudinal ribs 4, the transverse ribs 3 and the shear resistant pieces 5 are combined to form the shear resistant connecting piece, the shear resistant connecting piece enables the orthotropic plate and the UHPC thin layer 2 to be capable of coordinately deforming, the shear resistant pieces 5 can enable the UHPC thin layer 2 positioned in the central area of the lattice to be effectively combined with the steel plate, and the lattice formed by the longitudinal ribs 4 and the transverse ribs 3 effectively restrains the UHPC thin layer 2 with the expansion rate not less than 0.2%. After the UHPC thin layer 2 is cast in the lattice region, the UHPC thin layer 2 with the expansion rate of not less than 0.2 percent can generate certain expansion and is constrained by the lattice to form self-prestress, so that the UHPC can fully exert the excellent mechanical property. The bridge deck structure provided by the invention has the advantages that the shear connector is arranged, the bridge deck structure which has stronger constraint on the UHPC thin layer 2 and good bearing performance is formed, and the bridge deck structure is light, convenient, safe, efficient, excellent in durability, excellent in physical and mechanical properties and wide in application prospect.
The UHPC thin layer 2 can be directly poured on the orthotropic plate with the shear connector in a prefabrication factory, and the problem that the UHPC thin layer cannot be prefabricated in the prefabrication factory and can be poured only in site is solved.
The expansion rate of the UHPC thin layer 2 is 0.2-1.2%, the expansion rate is preferably 0.6%, when the expansion rate is 0.6%, the UHPC thin layer 2 is constrained by the lattice after being poured into the lattice area, and the self-prestress effect is better, wherein the expansion rate is that an expanding agent is added into the UHPC.
The thickness of the UHPC thin layer 2 is 50-80mm, preferably 60mm, and the UHPC thin layer and the steel plate can form a combined bridge deck plate with good combination effect.
The height of the transverse ribs 3 and the longitudinal ribs 4 is 40-60mm, the thickness is 3-8mm, preferably the height is 50mm, and the thickness is 5mm, so that the lattice can effectively restrain the UHPC thin layer.
The transverse ribs 3 and the longitudinal ribs 4 are linear plates or corrugated plates, preferably corrugated plates, so that the UHPC thin layer 2 and the steel bridge deck plate can be combined better.
The transverse ribs 3 and the longitudinal ribs 4 are perforated plates, and longitudinal steel bars 6 and transverse steel bars 7 which are vertical to each other in the longitudinal direction and the transverse direction are respectively arranged at the perforated positions of the transverse ribs 3 and the longitudinal ribs 4 so as to form an effective PBL connecting piece.
At least 2 transverse steel bars 7 are arranged between every two adjacent transverse ribs 3, and at least 2 longitudinal steel bars 6 are arranged between every two adjacent longitudinal ribs 4, so that the UHPC thin layer 2 and the steel plate are effectively combined.
The diameters of the openings of the transverse ribs 3 and the longitudinal ribs 4 are 20-40mm, and the diameters of the longitudinal reinforcing steel bars 6 and the transverse reinforcing steel bars 7 are 8-20 mm.
1-8 shear-resistant pieces 5 are arranged in any lattice region formed by the transverse ribs 3 and the longitudinal ribs 4, the specific number depends on the area size of the lattice region, and in the embodiment, 4 shear-resistant pieces 5 are arranged in any lattice region.
The shear resistant part 5 is a stud, has a simple structure and is convenient to produce and manufacture.
The invention discloses a bridge deck structure capable of restraining UHPC in a partitioned mode, which has 3 implementation methods, including a segmental cast-in-place method, a segmental prefabrication installation method and an integral cast-in-place UHPC thin layer method after prefabricating and installing an orthotropic plate, and respectively comprises the following steps:
the segmental cast-in-place method comprises the following steps:
and 5, welding joints among the top plates 1 of all the segments on site, processing the connection of longitudinal steel bars 6 and transverse steel bars 7 among the UHPC thin layers 2 of all the segments, and pouring the UHPC thin layer 2 of the next segment (including the UHPC thin layer 2 above the joints among the top plates 1).
Furthermore, seams among the top plates 1 of all the sections are connected by welding;
furthermore, the longitudinal steel bars 6 and the transverse steel bars 7 of the current section and the next section can adopt welding treatment, mechanical connection or lapping treatment, wherein the length of a welding joint is more than or equal to 10d, the lapping length of a binding joint is more than or equal to 45d, and d is the diameter of the steel bars;
further, before the next section of UHPC thin layer 2 is poured in place, the interface between the current section and the next section of UHPC thin layer 2 needs to be roughened.
The segment prefabricating and mounting method comprises the following steps:
and 5, pouring the wet joint concrete in situ.
Furthermore, seams among the top plates 1 of all the sections are connected by welding;
furthermore, the longitudinal steel bars 6 and the transverse steel bars 7 in the transverse ribs 3 and the longitudinal ribs 4 of each section can adopt welding treatment, mechanical connection or lap joint treatment, wherein the length of a welding joint is more than or equal to 10d, and the lap joint length of a binding joint is more than or equal to 45 d;
further, the wet seam length is the distance between two adjacent transverse ribs 3 or two adjacent longitudinal ribs 4;
further, the UHPC longitudinal seam may be a straight seam or a toothed seam.
The method for integrally casting the UHPC thin layer in situ after prefabricating and installing the orthotropic plate comprises the following steps:
and 5, integrally pouring the UHPC thin layer 2 laid above the top plate 1 on site.
Furthermore, seams among the steel bridge deck plates of all the sections are connected by welding.
Claims (9)
1. A bridge deck structure capable of restraining UHPC in a partitioning mode is characterized by comprising an orthotropic plate, wherein a plurality of longitudinal ribs (4) and transverse ribs (3) which are vertical to each other in the longitudinal direction and the transverse direction are arranged on the orthotropic plate, at least 1 shear-resistant part (5) is arranged in any lattice area formed by the transverse ribs (3) and the longitudinal ribs (4), UHPC thin layers (2) with expansion rates not less than 0.2% are paved on the orthotropic plate, the transverse ribs (3), the longitudinal ribs (4) and the shear-resistant parts (5), the transverse ribs (3) and the longitudinal ribs (4) are perforated plates, and longitudinal reinforcing steel bars (6) and transverse reinforcing steel bars (7) which are vertical to each other in the longitudinal direction and the transverse direction are arranged at the perforated positions of the transverse ribs (3) and the longitudinal ribs (4) respectively.
2. Bridge deck structure capable of partitionally constraining UHPC according to claim 1, wherein said thin layer (2) of UHPC has an expansion rate comprised between 0.2% and 1.2%.
3. Bridge deck structure for partitionably restraining UHPC according to claim 1 or 2, wherein said thin layer (2) of UHPC has a thickness of 50-80 mm.
4. Bridge deck structure for partitionably restraining UHPC according to claim 3, characterised in that said transverse ribs (3) and longitudinal ribs (4) have a height of 40-60mm and a thickness of 3-8 mm.
5. Bridge deck structure for partitionable restraint of UHPC according to claim 4, wherein said transverse ribs (3) and longitudinal ribs (4) are rectilinear or corrugated plates.
6. Bridge deck structure for partitionable restraint of UHPC according to claim 1, wherein at least 2 transverse reinforcements (7) are arranged between adjacent 2 transverse ribs (3) and at least 2 longitudinal reinforcements (6) are arranged between adjacent 2 longitudinal ribs (4).
7. Bridge deck structure for partitionable restraint of UHPC according to claim 6, wherein the transverse ribs (3) and the longitudinal ribs (4) have openings with a diameter of 20-40mm and the longitudinal reinforcements (6) and the transverse reinforcements (7) have a diameter of 8-20 mm.
8. A deck structure for partitionable restraint of UHPC's according to claim 1 or 2, wherein there are between 1 and 8 shear resistant members (5) in any of the lattice regions formed by said transverse ribs (3) and longitudinal ribs (4).
9. Bridge deck structure for partitionable restraint of UHPC according to claim 8, wherein said shear resistant members (5) are studs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010795877.XA CN111778849A (en) | 2020-08-10 | 2020-08-10 | But bridge floor structure of subregion restraint UHPC |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010795877.XA CN111778849A (en) | 2020-08-10 | 2020-08-10 | But bridge floor structure of subregion restraint UHPC |
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| CN111778849A true CN111778849A (en) | 2020-10-16 |
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| CN202010795877.XA Pending CN111778849A (en) | 2020-08-10 | 2020-08-10 | But bridge floor structure of subregion restraint UHPC |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090048671A (en) * | 2007-11-12 | 2009-05-15 | (주)다음기술단 | Temporary bridge using block of orthotropic steel deck system |
| KR20120054705A (en) * | 2010-11-22 | 2012-05-31 | 한국건설기술연구원 | Connecting details and connecting method of uhpc precast slab using steel bar in tapered recess |
| CN105113405A (en) * | 2015-08-21 | 2015-12-02 | 同济大学 | Composite bridge deck based on steel and UHPC (Ultra High Performance Concrete) |
| CN206646406U (en) * | 2017-02-20 | 2017-11-17 | 湖南大学 | Steel and ultra-high performance concrete combined bridge deck structure with bar dowel shearing resistance construction |
| CN110205937A (en) * | 2019-05-23 | 2019-09-06 | 长沙理工大学 | Orthotropic plate-ultra-high performance concrete combined bridge deck structure and construction method |
| CN110528763A (en) * | 2019-09-29 | 2019-12-03 | 福州大学 | Thin-walled UHPC with perforated panel PBL key and NC superimposed sheet and its construction method |
| CN111485491A (en) * | 2020-04-30 | 2020-08-04 | 中交三公局第一工程有限公司 | Orthotropic steel bridge deck plate tough concrete composite structure and construction method |
-
2020
- 2020-08-10 CN CN202010795877.XA patent/CN111778849A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090048671A (en) * | 2007-11-12 | 2009-05-15 | (주)다음기술단 | Temporary bridge using block of orthotropic steel deck system |
| KR20120054705A (en) * | 2010-11-22 | 2012-05-31 | 한국건설기술연구원 | Connecting details and connecting method of uhpc precast slab using steel bar in tapered recess |
| CN105113405A (en) * | 2015-08-21 | 2015-12-02 | 同济大学 | Composite bridge deck based on steel and UHPC (Ultra High Performance Concrete) |
| CN206646406U (en) * | 2017-02-20 | 2017-11-17 | 湖南大学 | Steel and ultra-high performance concrete combined bridge deck structure with bar dowel shearing resistance construction |
| CN110205937A (en) * | 2019-05-23 | 2019-09-06 | 长沙理工大学 | Orthotropic plate-ultra-high performance concrete combined bridge deck structure and construction method |
| CN110528763A (en) * | 2019-09-29 | 2019-12-03 | 福州大学 | Thin-walled UHPC with perforated panel PBL key and NC superimposed sheet and its construction method |
| CN111485491A (en) * | 2020-04-30 | 2020-08-04 | 中交三公局第一工程有限公司 | Orthotropic steel bridge deck plate tough concrete composite structure and construction method |
Non-Patent Citations (1)
| Title |
|---|
| 傅刚斌等: "《建筑材料》", 31 January 2009, 中国铁道出版社 * |
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