CN113846558A - Orthotropic UHPC combined bridge deck slab adopting steel ribs and construction method - Google Patents
Orthotropic UHPC combined bridge deck slab adopting steel ribs and construction method Download PDFInfo
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- CN113846558A CN113846558A CN202110885839.8A CN202110885839A CN113846558A CN 113846558 A CN113846558 A CN 113846558A CN 202110885839 A CN202110885839 A CN 202110885839A CN 113846558 A CN113846558 A CN 113846558A
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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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- 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
- E01D2101/26—Concrete reinforced
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Abstract
The invention relates to an orthotropic UHPC combined bridge deck with steel ribs, which comprises an UHPC bridge deck and orthotropic steel ribs, wherein the UHPC bridge deck is paved above the orthotropic steel ribs, the orthotropic steel ribs comprise inverted T-shaped steel beams arranged transversely and closed ribs arranged longitudinally, the inverted T-shaped steel beams and the closed ribs are respectively distributed in the transverse direction and the longitudinal direction of the UHPC bridge deck, the closed ribs are connected with the UHPC bridge deck by adopting PBL perforated plate connectors, the inverted T-shaped steel beams are connected with the UHPC bridge deck by adopting PBL perforated plate connectors, perforated longitudinal steel bars penetrate through the perforated holes of the inverted T-shaped steel beams, transverse steel bars penetrate through the closed ribs, the transverse steel bars and the longitudinal steel bars form reinforcement meshes between the orthotropic steel ribs, and the orthotropic steel ribs and the reinforcement meshes thereof are arranged at the bottom layer of the UHPC bridge deck. The invention also provides a construction method of the combined bridge deck. The invention has the advantages of reliable structure and easy construction.
Description
Technical Field
The invention relates to a structure and a construction method of a bridge, in particular to an orthotropic UHPC combined bridge deck structure with steel ribs and a construction method.
Background
In order to solve the problems of insufficient bearing capacity and easy cracking of the combined bridge deck slab, the construction of the bridge deck slab by using ultra-high performance concrete (UHPC) is proposed. UHPC is a novel cement-based composite material which integrates multiple advantages of ultrahigh strength, high toughness, high durability, high temperature resistance, impact resistance and the like, is gradually applied to various fields of national production, has attracted wide attention of foreign researchers, and is a hot point of research of various researchers, particularly application to high-rise buildings, long-span bridges and corrosive environments. Compared with other concrete, UHPC has the following advantages: 1. has ultrahigh strength; 2. the material has ultrahigh toughness and high durability; 3. has high environmental protection and low abrasion; 4, the manufacturing and construction process of the UHPC is basically the same as that of common concrete. Therefore, UHPC shows a wide engineering application prospect.
The orthotropic composite bridge deck has a plurality of advantages: 1. the dead weight is light; 2. the bearing capacity is high; 3. the construction period is short, and the factory manufacture and the field installation are both convenient; 4. the bridge girder is partially stressed and can be suitable for bridges with various structural forms and spans.
Most of the existing orthotropic combined bridge deck plates are formed by welding orthotropic steel ribs and steel plates, and then a layer of ultra-high performance concrete is laid on the steel bridge deck plates. In the bridge deck slab, because the bridge deck steel plate and the steel ribs are welded, the problems of welding defects, stress concentration, weld joint fatigue and the like exist at the connecting nodes, and the problems can further cause the damage of the bridge structure, so in order to avoid the welded connection between the steel top plate and the longitudinal and transverse stiffening ribs, reduce the problems of the welding fatigue and the stress concentration at the weld joints, reduce the steel consumption and the engineering quantity of the bridge deck slab, ensure the rigidity of the bridge deck slab, reduce the maintenance cost and the like, the orthotropic steel ribs and the ultrahigh-performance concrete are directly cast and connected to form a development direction of the structure.
Disclosure of Invention
The invention provides an orthotropic UHPC (ultra high performance concrete) combined bridge deck and a construction method thereof, aiming at solving the problem of structural damage caused by welding residual stress, weld joint fatigue and welding defects at welding joints between a bridge deck steel plate and steel ribs in a bridge combined bridge deck. The technical scheme is as follows:
the orthogonal anisotropy UHPC combined bridge deck with the steel ribs comprises a UHPC bridge deck and orthogonal anisotropy steel ribs, wherein the UHPC bridge deck is paved above the orthogonal anisotropy steel ribs, and the orthogonal anisotropy steel ribs are characterized in that the orthogonal anisotropy steel ribs comprise inverted T-shaped steel beams arranged transversely and closed ribs arranged longitudinally, the inverted T-shaped steel beams 4 and the closed ribs 5 are respectively distributed in the transverse direction and the longitudinal direction of the UHPC bridge deck, the closed ribs 5 are connected with the UHPC bridge deck 2 by adopting PBL perforated plate connectors, the inverted T-shaped steel beams 4 are connected with the UHPC bridge deck 2 by adopting PBL perforated plate connectors, longitudinal steel bars penetrate through holes of the inverted T-shaped steel beams, transverse steel bars penetrate through holes of the closed ribs, reinforcing steel bars in the transverse direction and the longitudinal direction form reinforcing steel bar nets among the orthogonal anisotropy steel ribs, and the reinforcing steel bar nets thereof are arranged at the bottom layer of the UHPC bridge deck.
Furthermore, the inverted T-shaped steel beams and the closed ribs are respectively distributed in the transverse direction and the longitudinal direction of the UHPC bridge deck at equal intervals.
Furthermore, the reinforcing steel bars in the transverse direction and the longitudinal direction are bound and fixed to form a reinforcing steel bar mesh.
Further, a polymer layer is laid on the UHPC bridge deck.
Further, the inverted T-shaped steel beam has the following dimensions: the width L3 of the bottom plate is 600 mm-800 mm, the thickness L4 of the web plate is 8-12 mm, the thickness H3 of the bottom plate is 8-12 mm, the height H2 of the web plate is 800-1000 mm, and the center distance between two adjacent inverted T-shaped steel beams is 800 mm-1000 mm.
Further, the dimensions of the closed rib are: the upper opening L1 is 400-500 mm, the lower opening L2 is 200-250mm, and the height H1 is 500-600 mm; the included angle between the two waists and the UHPC board is alpha 72 degrees, and the central distance between the adjacent closed ribs is 800 mm-1000 mm;
further, the thickness of the UHPC bridge deck plate is 12 mm.
Further, inside the top layer of the UHPC deck slab there is also arranged an inner UHPC reinforcement mesh.
The construction method of the orthotropic UHPC combined bridge deck with the steel ribs comprises the following steps:
(1) manufacturing closed ribs, manufacturing inverted T-shaped steel beams and manufacturing corresponding concrete moulds;
(2) transversely arranging inverted T-shaped steel beams, longitudinally arranging closed ribs to form orthotropic steel ribs, penetrating longitudinal steel bars at the openings of the inverted T-shaped steel beams, penetrating transverse steel bars at the openings of the closed ribs, and binding and fixing the steel bars in the transverse direction and the longitudinal direction to form a steel bar mesh between the orthotropic steel ribs;
(3) inversely hoisting orthotropic steel ribs, erecting a concrete mould below the orthotropic steel ribs, adopting an inverse pouring method, after pouring the orthotropic steel ribs and reinforcing meshes among the orthotropic steel ribs, arranging UHPC inner reinforcing meshes, wherein the reinforcing meshes are also arranged in the UHPC bridge deck, pouring UHPC after the mould is supported, removing a template after the strength of the UHPC reaches a relevant specified standard, and maintaining the UHPC bridge deck to form a prefabricated component;
(4) erecting, assembling and connecting the prefabricated components on a construction site to form an integral bridge deck structure;
(5) a polymer layer was laid on the UHPC bridge deck as a wearing layer.
In the step (2), the intersection of the inverted T-shaped steel beam and the longitudinally arranged closed ribs is welded and connected by adopting a double-sided welding process; and (3) arranging a UHPC inner reinforcement net at a height of 10mm above the bottom of the template.
The invention is characterized in that: the steel plate connected between the orthotropic steel rib and the UHPC bridge deck slab and the steel bar net arranged when the steel plate is connected with the UHPC bridge deck slab are removed, a series of problems caused by welding connection between the steel top plate and the steel rib are avoided, and the dead weight of the bridge deck slab and the engineering quantity of field construction are reduced to a certain extent. The composite structure can effectively solve engineering problems, improve construction efficiency and reduce the total life cost of the bridge, and the orthotropic steel ribs consisting of the closed ribs and the inverted T-shaped steel beams are particularly suitable for medium and large span bridge structures.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of the overall structure of the bridge deck structure of the present invention
FIG. 2 is a schematic view of the longitudinally arranged closed ribs of the deck slab of the present invention
FIG. 3 is a schematic view of the inverted T-shaped steel beams of the present invention with the bridge deck transversely disposed
FIG. 4 is a detailed view of the intersection of the longitudinal and transverse stiffeners of the decking of the present invention
FIG. 5 is a schematic view showing the connection between the inverted T-shaped steel beam and the UHPC bridge deck in the transverse arrangement of the bridge deck of the present invention
FIG. 6 is a schematic view showing the connection between the closed ribs arranged longitudinally of the bridge deck and the UHPC bridge deck according to the present invention
In the figure: the bridge deck is characterized in that the bridge deck is composed of a polymer layer 1, a UHPC bridge deck, namely an ultrahigh-performance concrete bridge deck, a closed rib 5 waist and a closed rib bottom edge M1 and a closed rib 5M 2M 3 web plates of the inverted T-shaped steel beams 4, a PBL perforated plate connecting piece 3, a through steel bar in the PBL perforated plate connecting piece, a closed rib 5 and the inverted T-shaped steel beam 4 are respectively in height H1 and H2, alpha is an included angle between the closed rib 5 waist and the UHPC bridge deck, the PBL perforated plate connecting piece adopted by connecting the inverted T-shaped steel beams 4 and the closed rib 5 with the UHPC bridge deck is 6, the inverted T-shaped steel beam perforated part 6 and 7 is a closed rib perforated part 7, and the L4, L3 and H3 are respectively an inverted T-shaped steel beam web plate thickness, a bottom plate width and a bottom plate thickness.
Detailed Description
The invention discloses an orthotropic UHPC combined bridge deck with steel ribs, which comprises UHPC bridge decks 2, orthotropic steel ribs and ultrahigh-performance concrete, wherein the UHPC bridge decks 2 are paved above the orthotropic steel ribs, a polymer paving layer 1 is arranged on the UHPC bridge decks 2, the orthotropic steel ribs comprise transversely arranged inverted T-shaped steel beams 4 and longitudinally arranged closed ribs 5, and the inverted T-shaped steel beams 4 and the closed ribs 5 are respectively distributed in the transverse direction and the longitudinal direction of the UHPC bridge decks. The closed rib 5 is connected with the UHPC bridge deck 2 by adopting a PBL perforated plate connecting piece, the inverted T-shaped steel beam 4 is connected with the UHPC bridge deck 2 by adopting a PBL perforated plate connecting piece, longitudinal steel bars penetrate through the perforated part 6 of the inverted T-shaped steel beam, transverse steel bars penetrate through the perforated part 7 of the closed rib, the steel bars in the transverse direction and the longitudinal direction form a steel bar net, and the steel bar net is poured in the UHPC bridge deck.
Specifically, the inverted T-shaped steel beams and the closed ribs are respectively distributed under the UHPC bridge deck at equal intervals to form orthotropic steel ribs. The central distance between two adjacent inverted T-shaped steel beams is 800-1000 mm, the length L3 of a bottom plate in each inverted T-shaped steel beam is 600-800 mm, the thickness L4 of a web plate is 8-12 mm, the height H3 is 8-12 mm, and the height H2 is 800-1000 mm; the center distance between two adjacent closed ribs is 800 mm-1000 mm, the upper opening L1 is 400-500 mm, the lower opening L2 is 200-250mm, the height H1 is 500-600 mm, and the included angle between two waists and the concrete slab is 72 degrees.
The reverse T-shaped steel beams arranged in the transverse direction are connected with the UHPC bridge deck by adopting PBL perforated plate connecting pieces, and the closed ribs arranged in the longitudinal direction are connected with the UHPC bridge deck by adopting PBL perforated plate connecting pieces. Orthotropic steel ribs consisting of transverse and longitudinal steel ribs are directly cast into a whole with the UHPC bridge deck slab in a cast-in-situ mode.
UHPC (ultra high performance concrete) has ultra high durability and mechanical properties, and is called the best durable engineering material. The mechanical property of the UHPC with proper reinforcement is close to that of a rigid structure, and meanwhile, the UHPC has excellent wear resistance and anti-explosion performance, so that the UHPC is particularly suitable for large-span bridges, anti-explosion structures (military engineering, bank vaults and the like) and thin-wall structures, and high-abrasion and high-corrosion environments. Specific performance indexes of UHPC are: the compressive strength is more than or equal to 130 MPa; the breaking strength is more than or equal to 15 MPa; the diffusion coefficient of the chloride ions is less than or equal to 0.1 multiplied by 10 < -12 > m/s. After the UHPC is cured by steam, the shrinkage and creep amount are negligible. Orthotropic steel ribs are directly arranged at the lower part of the UHPC plate and are directly cast into a whole to form an orthotropic UHPC combined bridge deck plate with the steel ribs, and a polymer layer with the thickness of 10mm is laid on the UHPC bridge deck plate as a wearing layer after on-site splicing. Therefore, the dead weight of the bridge deck slab is greatly reduced, the rigidity and the overall performance of the bridge deck slab are remarkably improved, and the problem of welding fatigue between the steel plate and the steel rib is effectively solved.
In this example, the thickness of the UHPC deck slab was 12mm and the thickness of the polymer was 10 mm.
The UHPC and polymer pavers involved in the present invention are all commercially available materials.
The bridge deck plate adopts a combined structure of orthotropic steel ribs and a UHPC bridge deck plate, and is different from the traditional orthotropic steel bridge deck plate.
The construction method of the orthotropic UHPC combined bridge deck structure with the steel ribs comprises the following steps:
(1) manufacturing a closed rib, manufacturing an inverted T-shaped steel beam, and manufacturing a corresponding concrete mold, wherein the closed rib is in the shape of an isosceles trapezoid with a large upper part and a small lower part, the width L1 of an upper opening is 400-500 mm, the width L2 of a lower opening is 200-250mm, the height H1 is 500-600 mm, and the included angle alpha between two waists and the UHPC plate is 72 degrees; the size of the inverted T-shaped steel beam is as follows: the thickness of the alloy is 600-800 mm for L3, 8-12 mm for L4, 8-12 mm for H3 and 800-1000 mm for H2; the reinforcing bar of the PBL trompil board connecting piece that adopts the model to be: and Q370.
(2) The inverted T-shaped steel beam is transversely arranged, the closed rib is longitudinally arranged, the intersection part of the inverted T-shaped steel beam and the closed rib is welded and connected by double-sided welding to form an orthotropic rib, a hole 6 of the inverted T-shaped steel beam penetrates through the longitudinal steel bar, a hole 7 of the closed rib penetrates through the transverse steel bar, and the steel bars in the transverse direction and the longitudinal direction are bound and fixed to form a steel bar mesh;
(3) and reversely hoisting the orthotropic ribs, erecting a concrete mould below the orthotropic ribs, arranging a reinforcing mesh at the height of 10mm above the bottom of the template by adopting a reverse pouring method, arranging the reinforcing mesh in the UHPC bridge deck, pouring the ultra-high performance concrete after the mould supporting is finished, and removing the template after the strength of the ultra-high performance concrete reaches the relevant specified standard. Performing high-temperature steam curing on the UHPC bridge deck plate which reaches the relevant specified standard to form a prefabricated part;
(4) erecting, assembling and connecting the prefabricated components on a construction site to form an integral bridge deck structure;
(5) a UHPC bridge deck was laid with a 10mm thick polymer as a wearing layer.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions, or alterations made to the above-described structures of the present invention according to the above-described contents of the present invention and the ordinary skill in the art without departing from the basic technical spirit of the present invention are also within the scope of the present invention.
Claims (10)
1. The orthogonal anisotropic UHPC combined bridge deck is characterized in that the orthogonal anisotropic steel ribs comprise inverted T-shaped steel beams arranged transversely and closed ribs arranged longitudinally, the inverted T-shaped steel beams and the closed ribs are respectively distributed in the transverse direction and the longitudinal direction of the UHPC bridge deck, the closed ribs are connected with the UHPC bridge deck by adopting PBL perforated plate connectors, the inverted T-shaped steel beams are connected with the UHPC bridge deck by adopting the PBL perforated plate connectors, longitudinal steel bars penetrate through holes of the inverted T-shaped steel beams, transverse steel bars penetrate through holes of the closed ribs, reinforcing steel meshes between the orthogonal anisotropic steel ribs are formed by the transverse steel bars and the longitudinal steel bars, and the orthogonal anisotropic steel ribs and the reinforcing steel meshes are arranged on the bottom layer of the UHPC bridge deck.
2. A UHPC composite floor slab as recited in claim 1 wherein the inverted T-shaped steel beams and the closed ribs are respectively arranged in the transverse and longitudinal directions of the UHPC floor slab at equal intervals.
3. The UHPC composite bridge deck according to claim 1, wherein the reinforcement bars in the longitudinal and transverse directions are bound and fixed to form reinforcement meshes between the orthotropic steel ribs.
4. A UHPC composite deck according to claim 1 wherein inside the top layer of the UHPC deck there is also arranged an inner UHPC rebar grid.
5. A UHPC composite bridge deck according to claim 1 wherein a polymer layer is applied to the UHPC bridge deck.
6. The UHPC composite decking of claim 1, wherein the inverted T-beam has dimensions: the width L3 of the bottom plate is 600 mm-800 mm, the thickness L4 of the web plate is 8-12 mm, the thickness H3 of the bottom plate is 8-12 mm, the height H2 of the web plate is 800-1000 mm, and the center distance between two adjacent inverted T-shaped steel beams is 800 mm-1000 mm.
7. A UHPC composite decking according to claim 1 wherein the closed ribs are dimensioned: the upper opening L1 is 400-500 mm, the lower opening L2 is 200-250mm, and the height H1 is 500-600 mm; the included angle between the two waists and the UHPC board is 72 degrees, and the central distance between the adjacent closed ribs is 800 mm-1000 mm.
8. A UHPC composite decking according to claim 1 wherein the thickness of the UHPC deck slab is 12 mm.
9. The construction method of the orthotropic UHPC combined bridge deck with steel ribs as claimed in any one of claims 1-8, wherein the method comprises the following steps: the method comprises the following steps:
(1) manufacturing closed ribs, manufacturing inverted T-shaped steel beams and manufacturing corresponding concrete moulds;
(2) transversely arranging inverted T-shaped steel beams, longitudinally arranging closed ribs to form orthotropic steel ribs, penetrating longitudinal steel bars at the openings of the inverted T-shaped steel beams, penetrating transverse steel bars at the openings of the closed ribs, and binding and fixing the steel bars in the transverse direction and the longitudinal direction to form a steel bar mesh between the orthotropic steel ribs;
(3) inversely hoisting orthotropic steel ribs, erecting a concrete mould below the orthotropic steel ribs, adopting an inverse pouring method, after pouring the orthotropic steel ribs and reinforcing meshes among the orthotropic steel ribs, arranging UHPC inner reinforcing meshes, wherein the reinforcing meshes are also arranged in the UHPC bridge deck, pouring UHPC after the mould is supported, removing a template after the strength of the UHPC reaches a relevant specified standard, and maintaining the UHPC bridge deck to form a prefabricated component;
(4) erecting, assembling and connecting the prefabricated components on a construction site to form an integral bridge deck structure;
(5) a polymer layer was laid on the UHPC bridge deck as a wearing layer.
10. The construction method according to claim 9, wherein in the step (2), the inverted T-shaped steel beam and the longitudinally arranged closed rib are welded and connected at the intersection part by adopting a double-sided welding process; and (3) arranging a UHPC inner reinforcement net at a height of 10mm above the bottom of the template.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110885839.8A CN113846558A (en) | 2021-08-03 | 2021-08-03 | Orthotropic UHPC combined bridge deck slab adopting steel ribs and construction method |
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| CN202110885839.8A CN113846558A (en) | 2021-08-03 | 2021-08-03 | Orthotropic UHPC combined bridge deck slab adopting steel ribs and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114908665A (en) * | 2022-04-12 | 2022-08-16 | 东南大学 | Modular light UHPC combined steel plate girder bridge system and construction method thereof |
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- 2021-08-03 CN CN202110885839.8A patent/CN113846558A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114908665A (en) * | 2022-04-12 | 2022-08-16 | 东南大学 | Modular light UHPC combined steel plate girder bridge system and construction method thereof |
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