CN111206499A - Steel-concrete composite beam bridge deck continuous structure adopting annular joints - Google Patents
Steel-concrete composite beam bridge deck continuous structure adopting annular joints Download PDFInfo
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- CN111206499A CN111206499A CN202010119066.8A CN202010119066A CN111206499A CN 111206499 A CN111206499 A CN 111206499A CN 202010119066 A CN202010119066 A CN 202010119066A CN 111206499 A CN111206499 A CN 111206499A
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention belongs to the technical field of bridge engineering, and particularly relates to a steel-concrete composite beam bridge deck continuous structure adopting annular joints; the bridge floor continuous structure will connect the steel sheet welding on both sides end beam roof after the end beam erects to shear force nail, its characterized in that are laid to the symmetry on it: the bridge deck continuous structure further comprises longitudinal annular reinforcing steel bars, annular connecting reinforcing steel bars and bridge deck continuous grooves, the annular connecting reinforcing steel bars and the longitudinal annular reinforcing steel bars extending out of the bridge deck at two sides are arranged in a ring corresponding mode and are connected in a butt welding staggered joint mode, and UHPC ultrahigh-strength joint concrete is poured in the bridge deck continuous grooves; the steel-concrete composite beam bridge deck continuous structure with the annular joint can enhance the bridge deck continuous connection strength, is simple in structure, convenient to construct and high in reliability.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to a steel-concrete composite beam bridge deck continuous structure adopting annular joints.
Background
The bridge deck continuous structure is commonly used for a multi-span simple beam with medium and small span, in order to ensure the driving comfort, a beam end expansion device is cancelled to connect the bridge deck plates into a whole, the advantages of simple structure, flexible and quick construction and low cost of the simple beam can be fully utilized, and the adverse factors of vehicle jumping, easy damage, frequent maintenance and repair and the like caused by the expansion device are avoided.
The continuous structure of the steel-concrete composite beam bridge deck considers the sliding effect between the steel beam and the concrete and the influence of temperature, live load and the like, and the bridge deck is easy to crack at the continuous part of the bridge deck because the bridge deck is often deformed and inconsistent due to the stretching and the rotation of the beam body because of insufficient connection strength, so that the bridge deck is a weak part of the steel-concrete composite beam structure.
For improving the stress situation at the continuous position of bridge floor, guarantee bridge floor continuous structure durable, current way in the engineering is mainly: the method adopts improved bridge deck continuous joint filling materials (steel fiber concrete, epoxy resin concrete and the like), high-strength joint crossing connectors (profile steel connectors, PBL connectors and the like), PC bridge deck continuous joints and complex limiting devices between beam ends and the like.
The existing bridge deck continuous construction in engineering has the following disadvantages: although the tensile strength of joint concrete is improved by adopting the improved bridge deck continuous gap filling material, the stress of the bridge deck continuous part is complex, and the reliability is insufficient; the high-strength seam-crossing connecting piece can bear the tensile stress generated by the negative bending moment, but the structure is complex, the connecting piece needs to be embedded in the bridge deck during construction, concrete is inconvenient to pour in the later period, and the construction quality is difficult to guarantee; the adoption of the continuous joint of the PC bridge deck can increase the secondary internal force of the prestress, so that the shear stress between the concrete and the steel beam at the continuous part of the bridge deck is increased, and the construction is inconvenient; the limit device is adopted between the beam ends to reduce the corner and displacement of the beam ends, but longitudinal secondary internal force between the end beams is generated at the same time, and the construction and maintenance are complex.
Disclosure of Invention
In order to overcome the defects of the traditional steel-concrete composite structure in the form of transverse connection between boxes, the invention provides a steel-concrete composite beam bridge deck continuous structure adopting annular joints, which can enhance the continuous connection strength of the bridge deck, and has the advantages of simple structure, convenience in construction and high reliability.
The technical scheme adopted by the invention is as follows:
a steel-concrete composite beam bridge deck continuous structure adopting annular joints is characterized in that after end cross beams 7 are erected, connecting steel plates 3 are welded on top plates of cross beams 9 at two sides, shear nails 4 are symmetrically distributed on the top plates, the bridge deck continuous structure further comprises longitudinal annular steel bars 1, annular connecting steel bars 2 and bridge deck continuous notches 6, the annular connecting steel bars 2 and the longitudinal annular steel bars 1 extending out of bridge decks 9 at two sides are arranged in a ring-forming mode correspondingly and are connected in a butt welding staggered joint mode, and UHPC ultrahigh-strength joint concrete 5 is poured in the bridge deck continuous notches 6.
The end beam 7 is the end part of a simply supported beam, and a bridge deck continuous notch 6 is reserved on a beam end bridge deck 9.
The connecting steel plate 3 is a straight steel plate or a zigzag steel plate such as a trapezoid, a triangle, a rectangle, etc.
The longitudinal annular reinforcing steel bars 1 are extending parts of longitudinal reinforcing steel bars of the bridge deck 9 of the steel-concrete composite beam, and are poured in the bridge deck 9 after the end cross beams 3 are erected.
The annular connecting steel bars 2 are longitudinal connecting steel bars which are separately welded into rings, and are respectively lapped with the longitudinal annular steel bars 1 extending out of the left and right bridge decks 9 to form a double-ring structure.
And transverse steel bars are transversely arranged in the bridge deck continuous groove 6 and correspond to the longitudinal annular steel bars 1 and the shear nails 7 in position relation.
When the longitudinal annular reinforcing steel bars 1 and the annular connecting reinforcing steel bars 2 are arranged in an annular mode, the annular joint reinforcing steel bars need to be ensured to have overlapping length, namely the minimum length of an annular part formed by overlapping the longitudinal annular reinforcing steel bars 1 and the annular connecting reinforcing steel bars 2 of the bridge deck 9.
The calculation formula of the overlapping length of the annular joint reinforcing steel bar 2 is as follows:
La＝45γlaAsftd/kAdfsd≥1.5dB≥0.25Lb
wherein L isa: the necessary overlap length (mm) of the ring-shaped joint reinforcing steel bar;
γ: the steel bar anchoring shape coefficient is 0.5 when the ribbed steel bar is adopted; la: basic anchoring length, /)a＝(σsa/4τoa)·d≥45d；σsa: the tensile strength limit value of the steel bar under the normal use limit state or the fatigue limit state; tau isoa: the limit value of the adhesion stress intensity of the concrete; d: nominal diameter of the rebar; a. thes/Ad: the ratio of the area of the cross section of the tensioned reinforcement to the area of the cross section of the stressed reinforcement; f. oftd/fsd: the ratio of the design value of the tensile strength of the concrete to the design value of the tensile strength of the common steel bar; k: taking a coefficient considering the influence of the movement amount of the joint reinforcing steel bar, and taking k to be 0.5; dB: bending diameter of the steel bar; LB: bridge deck continuous seam width.
The invention has the beneficial effects that: the invention provides a steel-concrete composite beam bridge deck continuous structure adopting annular joints, which adopts the technical scheme that a steel cover plate provided with shear nails is connected with an end beam top plate, annular joint reinforcing steel bars are adopted to connect longitudinal reinforcing steel bars of simply supported beam bridge deck plates on two sides, and UHPC ultrahigh-strength joint concrete is adopted to cast bridge deck continuous notches, so that the integration of the bridge deck plates is realized by means of the overlapping of the annular reinforcing steel bars, the connecting strength of the concrete bridge deck plates at the continuous part of the bridge deck is improved, the tensile stress generated by negative bending moment at the continuous part of the bridge deck is born by the steel cover plate, the longitudinal connecting reinforcing steel bars and the UHPC ultrahigh-strength joint concrete in sequence, the advantages of the structure and the material performance are fully exerted, and the cracking risk of the concrete bridge.
The steel-concrete composite beam bridge deck continuous structure adopting the UHPC annular joint, provided by the invention, has the advantages that the steel-concrete composite beam bridge deck plates on two sides are connected into a stressed whole through structural measures, the structure is simple, the construction is convenient, the construction cost is lower, the bridge deck continuous connection quality can be ensured, and the steel-concrete composite beam bridge deck continuous structure has good technical and economic advantages.
Drawings
FIG. 1 is a schematic structural view of a continuous bridge deck construction according to the invention;
FIG. 2 is a circular joint steel bar big sample of the bridge deck continuous construction of the present invention;
FIG. 3 is a diagram illustrating calculation of the necessary overlapping length of the annular reinforcing steel bars for the continuous bridge deck construction according to the present invention;
FIG. 4 is a schematic plane view of a top plate connecting steel plate of an end cross beam in the bridge deck continuous structure according to the present invention;
FIG. 5 is a schematic plan view of another embodiment of the end beam top plate connector steel plate of the present invention;
shown in the figure: the bridge deck comprises longitudinal annular steel bars 1, annular connecting steel bars 2, connecting steel plates 3, shear nails 4, UHPC ultrahigh-strength joint concrete 5, a bridge deck continuous notch 6, end cross beams 7, a support 8 and a bridge deck 9.
Detailed Description
The technical scheme of the invention is further explained by specific embodiments in the following with the accompanying drawings:
example 1
The present invention provides a steel-concrete composite beam deck continuous construction using annular joints, which includes in accordance with the present embodiment: the bridge deck comprises longitudinal annular steel bars 1, annular connecting steel bars 2, connecting steel plates 3, shear nails 4 arranged on the connecting steel plates and UHPC ultrahigh-strength joint concrete 5 poured in a continuous slot of the bridge deck, wherein the bridge deck extends out of the continuous slot of the bridge deck, and the UHPC ultrahigh-strength joint concrete 5 is shown in figure 1.
In this embodiment, the width of the continuous slot 6 of the bridge deck is 500mm, and the distance from the beam end to the center line of two adjacent bridge spans is 40mm, i.e. the total width of the continuous joint of the bridge deck is 1080 mm. The bridge deck 9 is a common reinforced concrete bridge deck and is 250mm in thickness, the longitudinal bending-resistant reinforcing steel bars of the bridge deck 9 are HRB400 reinforcing steel bars with the diameter of 16mm, the distance between the upper layer of longitudinal reinforcing steel bars and the lower layer of longitudinal reinforcing steel bars of the bridge deck 9 is 170mm, the length of the annular longitudinal reinforcing steel bars 2 of the bridge deck 9 extending into the continuous notch 6 of the bridge deck is 390mm, and the bridge deck continuous structural bars are calculated according to the minimum overlapping length calculation formula of the annular connecting reinforcing steel bars 2 in the specificationThe minimum overlapping length of the annular reinforcing steel bar in the embodiment is 294mm and satisfies La≥0.25Lb＝270mm，LaNot less than 1.5dB and 255mm, L is taken in this examplea350mm, the length of the annular connecting steel bar is L0870 mm. The annular connecting steel bars 2 and the longitudinal annular steel bars 1 of the left and right bridge decks 9 are arranged in a ring corresponding mode, butt welding is adopted, joints of adjacent welding steel bars are arranged in a staggered mode, a double-ring structure is formed within the continuous joint range of the bridge deck, the overlapping length of the two sides of the double-ring structure is the same as that of the longitudinal steel bars of the bridge decks 9, and the transverse distance of the annular connecting steel bars 2 is the same as that of the longitudinal connecting steel bars 1 of the bridge decks 9.
In this embodiment, the end beam top plate connecting steel plate 3 is a straight steel plate welded on the end beam top plate, the thickness of the steel plate is 12mm, the width of the steel plate is 980mm, and the connecting steel plate 3 is arranged in the transverse bridge direction, as shown in fig. 2. Considering the stress transmission of the continuous part of the bridge deck, four rows of shear pins 4 are symmetrically distributed on the connecting steel plate 3, the shear pins 4 are stud connecting pieces, the relation between the shear pins and the longitudinal and transverse connecting steel bars 1 is required to be noticed during distribution, and the stud positions can be locally adjusted when necessary. In addition, the end beam connecting steel plate 3 in this embodiment may also be a serrated steel plate on the plane to increase the welding strength with the top plate of the end beam 7, as shown in fig. 4. The saw-tooth shape of the saw-tooth steel plate can be in the forms of trapezoid, triangle, rectangle and the like.
In this embodiment, the UHPC ultrahigh-strength joint concrete 5 is an ultrahigh-strength cement-based material having high strength, high toughness, and low porosity. Based on the good tensile, bending and cracking resistance of UHPC, the bridge deck is not easy to crack under the actions of temperature change, shrinkage creep, live load and the like at the continuous structure of the bridge deck, and has the characteristics of low porosity and compactness, so that the bridge deck has better durability and service life when being applied to the joint position of the bridge span.
In this embodiment, the construction sequence of the steel-concrete composite beam bridge deck continuous structure using the annular joint generally includes erecting a steel-concrete main beam, laying deck slab steel bars and pouring bridge deck slab concrete, welding end beam top plate steel plates at the bridge deck continuous structure, arranging and welding annular connecting steel bars, laying transverse bridge steel bars, spot welding shear nails on the steel plates, pouring UHPC ultrahigh strength joint concrete, and laying an asphalt concrete pavement.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides an adopt steel-concrete combination beam bridge floor continuous construction of cyclic annular seam, the bridge floor continuous construction will connect the steel sheet welding on both sides end beam roof after the end beam erects to the shear force nail is laid to the symmetry on it, its characterized in that: the bridge deck continuous structure further comprises longitudinal annular reinforcing steel bars, annular connecting reinforcing steel bars and bridge deck continuous grooves, the annular connecting reinforcing steel bars and the longitudinal annular reinforcing steel bars extending out of the bridge deck at two sides are arranged in a ring corresponding mode and are connected in a butt welding staggered joint mode, and UHPC ultrahigh-strength joint concrete is poured in the bridge deck continuous grooves.
2. A steel-concrete composite beam deck continuous construction using ring joints according to claim 1, wherein: the end beam is the end part of the simply supported beam, and a bridge deck continuous notch is reserved on the bridge deck at the beam end.
3. A steel-concrete composite beam deck continuous construction using ring joints according to claim 1, wherein: the longitudinal annular reinforcing steel bars are extending parts of the longitudinal reinforcing steel bars of the bridge deck of the steel-concrete composite beam, and are poured in the bridge deck after the end cross beams are erected.
4. A steel-concrete composite beam deck continuous construction using ring joints according to claim 1, wherein: the annular connecting steel bars are longitudinal connecting steel bars which are welded into rings independently, and are respectively lapped with longitudinal annular steel bars extending out of the bridge decks on the left side and the right side to form a double-ring structure.
5. A steel-concrete composite beam deck continuous construction using ring joints according to claim 2, wherein: and transverse steel bars are transversely arranged in the continuous notches of the bridge deck, and the transverse steel bars correspond to the position relationship between the longitudinal annular steel bars and the shear nails.
6. A steel-concrete composite beam deck continuous construction using ring joints according to claim 1, wherein: when the longitudinal annular reinforcing steel bars and the annular connecting reinforcing steel bars are arranged in a ring shape, the annular joint reinforcing steel bars of the longitudinal annular reinforcing steel bars and the annular connecting reinforcing steel bars need to ensure the overlapping length, namely the minimum length of the annular part formed by overlapping the longitudinal annular reinforcing steel bars and the annular connecting reinforcing steel bars of the bridge deck.
7. A steel-concrete composite beam deck continuous construction using ring joints according to claim 6, wherein: the calculation formula of the overlapping length of the annular joint reinforcing steel bar is as follows:
La＝45γlaAsftd/kAdfsd≥1.5dB≥0.25Lb
wherein L isa: the necessary overlap length (mm) of the ring-shaped joint reinforcing steel bar;
γ: the steel bar anchoring shape coefficient is 0.5 when the ribbed steel bar is adopted; la: basic anchoring length, /)a＝(σsa/4τoa)·d≥45d；σsa: the tensile strength limit value of the steel bar under the normal use limit state or the fatigue limit state; tau isoa: the limit value of the adhesion stress intensity of the concrete; d: nominal diameter of the rebar; a. thes/Ad: the ratio of the area of the cross section of the tensioned reinforcement to the area of the cross section of the stressed reinforcement; f. oftd/fsd: the ratio of the design value of the tensile strength of the concrete to the design value of the tensile strength of the common steel bar; k: taking a coefficient considering the influence of the movement amount of the joint reinforcing steel bar, and taking k to be 0.5; dB: bending diameter of the steel bar; LB: bridge deck continuous seam width.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010119066.8A CN111206499A (en) | 2020-02-26 | 2020-02-26 | Steel-concrete composite beam bridge deck continuous structure adopting annular joints |
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| CN202010119066.8A CN111206499A (en) | 2020-02-26 | 2020-02-26 | Steel-concrete composite beam bridge deck continuous structure adopting annular joints |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049026A (en) * | 2020-09-02 | 2020-12-08 | 湖南大学 | Prefabricated beam section, high early strength UHPC wet joint and long-span beam bridge suspension splicing construction method thereof |
| CN114775425A (en) * | 2022-04-21 | 2022-07-22 | 清华大学 | Bridge deck plate assembly, fabricated composite bridge and construction method thereof |
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2020
- 2020-02-26 CN CN202010119066.8A patent/CN111206499A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049026A (en) * | 2020-09-02 | 2020-12-08 | 湖南大学 | Prefabricated beam section, high early strength UHPC wet joint and long-span beam bridge suspension splicing construction method thereof |
| CN114775425A (en) * | 2022-04-21 | 2022-07-22 | 清华大学 | Bridge deck plate assembly, fabricated composite bridge and construction method thereof |
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