CN114438873A - Prefabricated ultrahigh-performance concrete hollowed-out T-shaped beam bridge structure and construction method thereof - Google Patents
Prefabricated ultrahigh-performance concrete hollowed-out T-shaped beam bridge structure and construction method thereof Download PDFInfo
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- CN114438873A CN114438873A CN202210143006.9A CN202210143006A CN114438873A CN 114438873 A CN114438873 A CN 114438873A CN 202210143006 A CN202210143006 A CN 202210143006A CN 114438873 A CN114438873 A CN 114438873A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 90
- 238000010276 construction Methods 0.000 title claims abstract description 19
- 239000004567 concrete Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 238000012423 maintenance Methods 0.000 claims description 10
- 238000009417 prefabrication Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- 238000009415 formwork Methods 0.000 claims description 4
- 210000003141 lower extremity Anatomy 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
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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
- E01D19/06—Arrangement, construction or bridging of expansion joints
- E01D19/067—Flat continuous joints cast in situ
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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
Abstract
The invention provides a prefabricated ultra-high performance concrete hollowed T-shaped beam bridge structure which comprises a beam rib unit, a bridge deck unit, an end diaphragm plate positioned at the end part of a bridge and a midspan diaphragm plate positioned in the middle part of the bridge, wherein the beam rib unit comprises a horseshoe-shaped lower flange and a web plate, the beam rib unit is integrally prefabricated by ultra-high performance concrete, the bridge deck unit is prefabricated by ultra-high performance concrete or common concrete, the web plate in the midspan area of the beam rib unit is provided with a plurality of openings, and the opening rate of the corresponding web plate is 20-60%. The prefabricated ultra-high performance concrete hollowed T-shaped beam bridge structure provided by the invention has the advantages of light dead weight, small cross-sectional area, strong bearing capacity, material saving, simplicity in installation, high construction efficiency, low comprehensive manufacturing cost and the like. The invention further provides a construction method for prefabricating the ultra-high performance concrete hollowed-out T-shaped beam bridge structure.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure and a construction method thereof.
Background
The prefabricated prestressed common concrete T beam has the advantages of simple structure, clear stress, low manufacturing cost, environmental protection, convenient erection and the like, is widely applied to bridge structures with the span of 10.0-50.0 m, and is particularly more generally applied to highway construction.
However, the following drawbacks and problems still exist with ordinary concrete T-beams: 1) the structural characteristics of the T-shaped beam enable the T-shaped beam to have higher beam height under the same span, and the elevation requirement under the bridge can limit the application of the T-shaped beam; 2) because the common concrete has low tensile strength and large shrinkage and creep, the beam body can generate cracks and develop slowly under the long-term action of factors such as vehicle load and the like; 3) the prefabricated T-shaped beams are connected into a whole by pouring common concrete at the longitudinal wet joint, and the reinforced concrete at the wet joint can crack to reduce the durability of the prefabricated T-shaped beams; 4) a large amount of shear steel bars need to be arranged on the common concrete prefabricated T-beam, and the workload of binding the steel bars is large; 5) along with the increase of span, the total weight of the prestressed reinforcement and the beam body is also sharply increased, and the difficulty of transportation and hoisting and the construction cost are improved.
In view of the above, there is a need to provide a new bridge structure to solve the above-mentioned technical problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a prefabricated ultra-high performance concrete hollowed T-shaped beam bridge structure which has the advantages of light dead weight, small cross section area, strong bearing capacity, material saving, simplicity in installation, high construction efficiency, low comprehensive cost and the like.
In order to solve the problems, the technical scheme of the invention is as follows:
the utility model provides a prefabricated ultra high performance concrete fretwork T girder bridge structure, includes beam rib unit, decking unit, is located the end cross slab of bridge tip and is located the cross slab of striding at bridge middle part, the beam rib unit includes horseshoe shape lower limb and web, the beam rib unit adopts the whole prefabrication of ultra high performance concrete, the decking unit adopts ultra high performance concrete or ordinary concrete prefabrication, the regional web of striding of beam rib unit has a plurality of trompil, and the percent opening that corresponds the web is 20-60%.
Further, the shape of the opening comprises at least one of a circle, an ellipse, a quadrangle, a pentagon, a hexagon and a triangle.
Furthermore, the U-shaped lower flange is provided with a longitudinal prestress member, and the prestress member is a prestress steel beam or/and a common steel bar; when the prestressed steel bundles are used as longitudinal stress members, tensioning is carried out after the beam rib units and the bridge deck units reach 90% of the designed strength.
Furthermore, the transverse bridge direction T beam structure of the bridge structure is at least one; when the structure of the transverse bridge direction T-shaped beam is more than two, the adjacent two T-shaped beams are connected into a whole by filling the ultra-high performance concrete in the longitudinal wet joint at the bridge deck.
Furthermore, the end diaphragm plate and the midspan diaphragm plate are connected with a reserved steel bar when the bridge is prefabricated, and two adjacent T-shaped beams are connected into a stressed whole through the midspan diaphragm plate.
Furthermore, in each bridge structure, a plurality of T-shaped beams are connected through at least three midspan diaphragm plates.
Further, the transverse distance between the two T-shaped beams is 0.5-5 m.
Furthermore, the height-span ratio of the T-shaped beam is 1/10-1/30, the width of the web plate is 0.10-1.0 m, and the width of the horseshoe-shaped lower flange is 0.3-2 m; the bridge deck units are rectangular or trapezoidal, and the thickness of the bridge deck units is 0.1-0.4 m.
Further, the single span of the bridge structure is 10-80 m.
The invention also provides a construction method of the prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure, which comprises the following steps:
step S1, manufacturing a T-beam template, positioning the template with the holes on the web plate in the span middle area of the beam rib unit, and installing the prestressed pipeline and the common steel bar;
step S2, prefabricating a bridge deck unit and a beam rib unit, wherein when the bridge deck unit adopts ultra-high performance concrete, the prefabricated beam rib unit and the bridge deck are integrally poured and steam curing is carried out; when the bridge deck unit is made of common concrete, firstly pouring the prefabricated ultrahigh-performance concrete beam rib units, after the beam rib units are cured by steam, erecting a formwork above the beam rib units for pouring construction, and combining the beam rib units and the beam rib units through the top shear connectors to form a T-shaped beam; a plurality of openings are formed in the web plate of the midspan area of the beam rib unit;
step S3, when the T-beam adopts the prestressed steel beam as the longitudinal stress steel bar, tensioning the prestressed force after the rib unit and the bridge deck unit of the T-beam are prefabricated to reach 90% of the design strength;
s4, transporting and hoisting the prefabricated T-shaped beam to form a single-span or multi-span bridge structure;
step S5, installing the bridge structure, specifically as follows:
if the bridge is a simple support structure, filling filler in wet joints of end diaphragm plates and mid-span diaphragm plates of two adjacent prefabricated T-beams in the transverse bridge direction for connection, and filling ultrahigh-performance concrete in the longitudinal wet joints of the bridge deck slab between every two adjacent T-beams in each span for connection and maintenance;
if the bridge deck is a multi-span bridge deck continuous and main beam simply-supported structure, filling materials are filled in wet joints of end diaphragm plates and span middle diaphragm plates of two adjacent prefabricated T-shaped beams in the transverse bridge direction for connection, and ultrahigh-performance concrete is filled in transverse wet joints of bridge decks at the ends of the two T-shaped beams for connection; concrete pouring is not carried out between the longitudinal main beams, and ultrahigh-performance concrete is filled between every two longitudinal T beams through the longitudinal wet joints of the bridge deck for connection and maintenance;
if the structure is a multi-span bridge deck continuous and main beam continuous structure, filling filler in the end diaphragm plates and the span-middle diaphragm plate wet joints of two adjacent prefabricated T beams in the transverse bridge direction for connection, and filling ultrahigh-performance concrete in the bridge deck transverse wet joints at the end parts of the two T beams for connection; the longitudinal main beams are connected by filling ultra-high performance concrete, and the longitudinal T beams of each span are connected and maintained by filling the ultra-high performance concrete through the longitudinal wet joints of the bridge deck;
and step S6, completing the construction of bridge deck pavement and auxiliary projects.
Compared with the prior art, the prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure and the construction method thereof have the beneficial effects that:
compared with the traditional common concrete, on one hand, the prefabricated ultra-high performance concrete hollowed T-beam bridge structure provided by the invention has the advantages that the beam rib units or the beam rib units and the bridge deck units of the T-beam are poured by the ultra-high performance concrete, so that on the other hand, the section size can be reduced under the condition of the same bearing capacity, and under the condition of the same section area and longitudinal stress steel bars, the ultimate bearing capacity of the bridge can be obviously improved due to the high compression resistance and tensile resistance of the ultra-high performance concrete; on the other hand, the reduction of the structure size is beneficial to realizing the lightening of the girder, not only can the engineering quantity of a lower structure be reduced and the spanning capacity of the bridge be improved, but also the prefabrication, the assembly and the transportation of the structure are easier.
Secondly, the prefabricated ultra-high performance concrete hollowed T-beam bridge structure provided by the invention is characterized in that the web plate in the midspan region of the T-beam is provided with the opening, so that on one hand, on the premise of meeting the stress, the self weight of the structure is reduced, and meanwhile, the binding amount of reinforcing steel bars can be reduced, thereby reducing the manufacturing cost; on the other hand, the engineering quantity of the lower part structure is greatly reduced, and the engineering cost of the full bridge is further reduced; on the other hand, the permeability and the aesthetic property of the bridge can be improved, so that the fusion with the surrounding environment is more perfect.
And thirdly, the prefabricated ultra-high performance concrete hollowed T-shaped beam bridge structure provided by the invention has the advantages that the ultra-high performance concrete base is compact, the bond force between the ultra-high performance concrete base and the common reinforcing steel bar is stronger, the wet joint and the cross beam joint are filled with the ultra-high performance concrete, the connection between the adjacent T-shaped beams is firmer, the overall performance is better, the later maintenance and repair cost is greatly reduced, and the whole life cost is greatly reduced.
And fourthly, the bending tensile strength of the ultra-high performance concrete hollow T-shaped beam bridge structure provided by the invention can reach more than 20MPa, the later-stage shrinkage after high-temperature steam curing is basically zero, the later-stage creep is very small, the cracking risk of the prefabricated T-shaped beam can be effectively reduced, and the prevention of the cracking of the prefabricated beam body is sufficiently ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a single-span prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure of the invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a schematic cross-sectional view at C-C of FIG. 1;
FIG. 5 is a schematic view of an embodiment of the multi-span prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure of the present invention;
FIG. 6 is a schematic view of another embodiment of the multi-span prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure of the present invention;
FIG. 7 is a schematic view of another embodiment of the multi-span prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure according to the present invention;
FIG. 8 is a schematic cross-sectional view taken at A1-A1 of FIGS. 5, 6 and 7;
FIG. 9 is a schematic cross-sectional view at B1-B1 in FIGS. 5, 6 and 7;
fig. 10 is a schematic cross-sectional structure at C1-C1 in fig. 5, 6 and 7.
Detailed Description
The following description of the present invention is provided to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above objects, features and advantages of the present invention more comprehensible.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual values, and between the individual values may be combined with each other to yield one or more new ranges of values, which ranges of values should be considered as specifically disclosed herein.
Example 1
Referring to fig. 1 to 4, fig. 1 is a schematic view of a single-span prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure according to the present invention; FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1; FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1; fig. 4 is a schematic sectional view at C-C in fig. 1. The prefabricated ultra-high performance concrete hollowed T-beam bridge structure comprises a beam rib unit 1, a bridge deck unit 2, end transverse clapboards 3 located at the end parts of a bridge and mid-span transverse clapboards 4 located in the middle part of the bridge, wherein the beam rib unit 1 comprises a horseshoe-shaped lower flange 11 and a web 12, the beam rib unit 1 is integrally prefabricated by ultra-high performance concrete, and the bridge deck unit 2 is prefabricated by ultra-high performance concrete or common concrete.
The web 12 in the midspan region of the beam rib unit has a plurality of openings 121, and the opening rate of the corresponding web is 20-60%.
In this embodiment, the shape of the opening 121 includes at least one of a circle, an ellipse, a quadrangle, a pentagon, a hexagon, and a triangle, and may be other shapes; and the aperture of the open pores is different. The open hole 121 is formed in a column structure corresponding to the T-beam formwork in corresponding shape and size, and when concrete is poured, the open hole is formed in the corresponding position of the column structure.
In this embodiment, the horseshoe-shaped lower flange 11 is provided with a longitudinal prestressed member, the prestressed member may be a steel strand, may also be a common steel bar, and may also be a combination of the steel strand and the common steel bar, and the common steel bar in the technical scheme in which the two are combined as the prestressed member is only used as the longitudinal stress auxiliary steel bar. Common steel bars are adopted in the area near the beam end as shear steel bars, the shearing resistance of the web plate in the midspan opening area is borne by the ultra-high performance concrete matrix, and only the structural steel bars are arranged.
In the embodiment, the end diaphragm plates 3 are distributed at two ends of the bridge structure and are connected with the steel bars reserved during the prefabrication of the T-shaped beam; the midspan diaphragm plate 4 is at least three, is connected with a reserved steel bar when the T beam is prefabricated, and is used for ensuring the structural rigidity of the T beam. And the arrangement direction of the end diaphragm plates 3 and the midspan diaphragm plates 4 is vertical to the longitudinal direction of the bridge.
In this embodiment, the transverse direction T beam structure of the bridge structure may be one piece, or two pieces, or more than two pieces, and when the transverse direction T beam structure is two pieces or more than two pieces, the transverse direction splicing may be realized, so that the bridge deck is widened. Two adjacent T roof beams connect through crossing well horizontal separators 4 and be the atress whole, and the horizontal bridge is connected to the end horizontal separators wet joint and the filling material that fills in crossing well horizontal separators wet joint at two adjacent prefabricated T roof beams.
In the embodiment, the height-span ratio of the T-shaped beam is 1/20, the width of the web plate span middle area is 0.2m, the end area is thickened to 0.4m, the width of the horseshoe-shaped lower flange is 0.6m, and the height is 0.4 m; the bridge deck units are rectangular or trapezoidal, the thickness of the bridge deck units is 0.14m, and transition sections of 50cm multiplied by 10cm are arranged at the junctions of the bridge deck units and the web plates.
The bridge structure of the embodiment is a single-span T-beam bridge, the longitudinal length of a beam section of the bridge structure is equal to the single-span length of the bridge, and the span of a single prefabricated T-beam unit is 10.0-80.0 m.
Example 2
Referring to fig. 5 and fig. 8 to fig. 10, the prefabricated ultra-high performance concrete hollow T-beam bridge structure of the present embodiment is a multi-span simply supported bridge structure.
In this embodiment, the cross bridge of bridge structures is at least two to T roof beam structure, makes the bridge cross bridge to splice, and two adjacent T roof beams connect for the atress is whole through crossing well diaphragm 4, and the cross bridge is connected to filling material in the wet seam 5 of the end diaphragm of two adjacent prefabricated T roof beams and the wet seam 6 of cross diaphragm in striding. The vertical T-shaped beams of each span are connected and maintained by filling ultrahigh-performance concrete through the vertical wet joints 8 of the bridge deck; an expansion joint is reserved between two adjacent vertical T-shaped beams, so that expansion caused by heat and contraction caused by cold are prevented.
In this embodiment, the lateral distance between two adjacent T-beams is 3.0 m.
The structure of each T-beam is as in example 1, and is not described herein.
Example 3
Referring to fig. 6, 8-10, the prefabricated ultra-high performance concrete hollow T-beam bridge structure of the present embodiment is a multi-span continuous, main beam simply supported beam bridge structure.
In this embodiment, the cross bridge of bridge structures is two at least to T roof beam structure, makes the bridge cross bridge splice to, and two adjacent T roof beams connect for the atress whole through striding well diaphragm 4.
In this embodiment, the filler is filled in the end diaphragm wet joint 5 and the midspan diaphragm wet joint 6 of two adjacent prefabricated T beams for connection in the cross bridge, and the ultra-high performance concrete is filled in the bridge deck horizontal wet joint 7 at the ends of the two T beams for connection. Concrete pouring is not carried out between the longitudinal main beams, and ultrahigh-performance concrete is filled between every two longitudinal T beams through the longitudinal wet joints 8 of the bridge deck for connection and maintenance.
The structure of each T-beam is as in example 1, and is not described herein.
Example 4
Referring to fig. 7, fig. 8-fig. 10, the prefabricated ultra-high performance concrete hollow T-beam bridge structure of the present embodiment is a multi-span continuous-deck and main-beam continuous-beam bridge structure.
In this embodiment, the cross bridge of bridge structures is two at least to T roof beam structure, makes the bridge cross bridge splice to, and two adjacent T roof beams connect for the atress whole through striding well diaphragm 4.
In this embodiment, the filling material is filled in the end diaphragm wet joint 5 and the midspan diaphragm wet joint 6 of two adjacent prefabricated T-beams in the transverse bridge direction for connection, and the ultra-high performance concrete is filled in the bridge deck transverse wet joint 7 at the end portions of the two T-beams for connection. The longitudinal main beams are filled with ultra-high performance concrete for connection, and the longitudinal T-shaped beams of each span are filled with the ultra-high performance concrete through the longitudinal wet joints 8 of the bridge deck for connection and maintenance.
The structure of each T-beam is as in example 1, and is not described herein.
The construction method of the prefabricated ultra-high performance concrete hollowed T-shaped beam bridge structure comprises the following steps:
step S1, manufacturing a T-beam template, positioning the template with the holes on the web plate in the span middle area of the beam rib unit, and installing the prestressed pipeline and the common steel bar;
step S2, prefabricating a bridge deck unit and a beam rib unit, wherein when the bridge deck unit adopts ultra-high performance concrete, the prefabricated beam rib unit and the bridge deck are integrally poured and steam curing is carried out; when the bridge deck unit is made of common concrete, firstly pouring the prefabricated ultrahigh-performance concrete beam rib units, after the beam rib units are cured by steam, erecting a formwork above the beam rib units for pouring construction, and combining the beam rib units and the beam rib units through the top shear connectors to form a T-shaped beam; a plurality of openings are formed in the web plate of the midspan area of the beam rib unit;
step S3, when the T-beam adopts the prestressed steel beam as the longitudinal stress steel bar, tensioning the prestressed force after the rib unit and the bridge deck unit of the T-beam are prefabricated to reach 90% of the design strength;
s4, transporting and hoisting the prefabricated T-shaped beam to form a single-span or multi-span bridge structure;
step S5, installing the bridge structure, specifically as follows:
if the bridge is a simple support structure, filling filler in wet joints of end diaphragm plates and mid-span diaphragm plates of two adjacent prefabricated T-beams in the transverse bridge direction for connection, and filling ultrahigh-performance concrete in the longitudinal wet joints of the bridge deck slab between every two adjacent T-beams in each span for connection and maintenance;
if the bridge deck is a bridge deck continuous and girder simply-supported structure, filling filler is filled in wet joints of end diaphragm plates and mid-span diaphragm plates of two adjacent prefabricated T-shaped beams in the transverse bridge direction for connection, and ultra-high performance concrete is filled in wet joints of bridge deck transverse bridge directions at the ends of the two T-shaped beams for connection; concrete pouring is not carried out between the longitudinal main beams, and ultrahigh-performance concrete is filled between every two longitudinal T beams through the longitudinal wet joints of the bridge deck for connection and maintenance;
if the structure is a bridge deck continuous and main beam continuous structure, filling materials are filled in wet joints of end diaphragm plates and mid-span diaphragm plates of two adjacent prefabricated T-beams in the transverse bridge direction for connection, and ultrahigh-performance concrete is filled in the transverse wet joints of bridge decks at the ends of the two T-beams for connection; the longitudinal main beams are connected by filling ultra-high performance concrete, and the longitudinal T beams of each span are connected and maintained by filling the ultra-high performance concrete through the longitudinal wet joints of the bridge deck;
and step S6, completing the construction of bridge deck pavement and auxiliary projects.
Compared with the prior art, the prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure and the construction method thereof have the beneficial effects that:
compared with the traditional common concrete, on one hand, the prefabricated ultra-high performance concrete hollowed T-beam bridge structure provided by the invention has the advantages that the beam rib units or the beam rib units and the bridge deck units of the T-beam are poured by the ultra-high performance concrete, so that on the other hand, the section size can be reduced under the condition of the same bearing capacity, and under the condition of the same section area and longitudinal stress steel bars, the ultimate bearing capacity of the bridge can be obviously improved due to the high compression resistance and tensile resistance of the ultra-high performance concrete; on the other hand, the reduction of the structure size is beneficial to realizing the lightening of the girder, not only can the engineering quantity of a lower structure be reduced and the spanning capacity of the bridge be improved, but also the prefabrication, the assembly and the transportation of the structure are easier.
Secondly, the prefabricated ultra-high performance concrete hollowed T-beam bridge structure provided by the invention is characterized in that the web plate in the midspan region of the T-beam is provided with the opening, so that on one hand, on the premise of meeting the stress, the self weight of the structure is reduced, and meanwhile, the binding amount of reinforcing steel bars can be reduced, thereby reducing the manufacturing cost; on the other hand, the engineering quantity of the lower part structure is greatly reduced, and the engineering cost of the full bridge is further reduced; on the other hand, the permeability and the aesthetic property of the bridge can be improved, so that the fusion with the surrounding environment is more perfect.
And thirdly, the prefabricated ultra-high performance concrete hollowed T-shaped beam bridge structure provided by the invention has the advantages that the ultra-high performance concrete base is compact, the bond force between the ultra-high performance concrete base and the common reinforcing steel bar is stronger, the wet joint and the cross beam joint are filled with the ultra-high performance concrete, the connection between the adjacent T-shaped beams is firmer, the overall performance is better, the later maintenance and repair cost is greatly reduced, and the whole life cost is greatly reduced.
And fourthly, the bending tensile strength of the ultra-high performance concrete hollow T-shaped beam bridge structure provided by the invention can reach more than 20MPa, the later-stage shrinkage after high-temperature steam curing is basically zero, the later-stage creep is very small, the cracking risk of the prefabricated T-shaped beam can be effectively reduced, and the prevention of the cracking of the prefabricated beam body is sufficiently ensured.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions and alterations to these embodiments will occur to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a prefabricated ultra high performance concrete fretwork T roof beam bridge structure, its characterized in that, includes beam rib unit, decking unit, is located the end cross slab of bridge tip and is located the middle cross slab of striding of bridge middle part, the beam rib unit includes horseshoe shape lower limb and web, the beam rib unit adopts the whole prefabrication of ultra high performance concrete, the decking unit adopts ultra high performance concrete or ordinary concrete prefabrication, the web of beam rib unit midspan region has a plurality of trompil, and corresponds the percent opening of web and be 20-60%.
2. The precast ultra-high performance concrete hollowed-out T-beam bridge structure according to claim 1, wherein the shape of the opening comprises at least one of a circle, an ellipse, a quadrangle, a pentagon, a hexagon, and a triangle.
3. The prefabricated ultra-high performance concrete hollowed-out T-beam bridge structure of claim 1, wherein the horseshoe-shaped lower flange is provided with a longitudinal pre-stressed member, and the pre-stressed member is a pre-stressed steel bundle or/and a common steel bar; when the prestressed steel bundles are used as longitudinal stress members, tensioning is carried out after the beam rib units and the bridge deck units reach 90% of the designed strength.
4. The prefabricated ultra-high performance concrete hollowed-out T-beam bridge structure of claim 1, wherein the transverse direction T-beam structure of the bridge structure is at least one piece; when the structure of the transverse bridge direction T-shaped beam is more than two, the adjacent two T-shaped beams are connected into a whole by filling the ultra-high performance concrete in the longitudinal wet joint at the bridge deck.
5. The precast ultra-high performance concrete hollowed T-beam bridge structure according to claim 4, wherein the end diaphragm plates and the midspan diaphragm plates are connected with reserved steel bars during bridge prefabrication, and two adjacent T-beams are connected into a stressed whole through the midspan diaphragm plates.
6. The precast ultra-high performance concrete hollowed-out T-beam bridge structure according to claim 5, wherein a plurality of T-beams are connected through at least three midspan diaphragms in each bridge span structure.
7. The prefabricated ultra-high performance concrete hollowed-out T-beam bridge structure according to claim 5, wherein the transverse distance between two T-beams is 0.5-5 m.
8. The prefabricated ultra-high performance concrete hollowed T-beam bridge structure of claim 1, wherein the height-span ratio of the T-beam is 1/10-1/30, the width of the web is 0.10-1.0 m, and the width of the horseshoe-shaped lower flange is 0.3-2 m; the bridge deck units are rectangular or trapezoidal, and the thickness of the bridge deck units is 0.1-0.4 m.
9. The precast ultra-high performance concrete hollowed-out T-beam bridge structure according to claim 1, wherein the single span of the bridge structure is 10-80 m.
10. The construction method for the prefabricated ultra-high performance concrete hollowed-out T-shaped beam bridge structure of claim 1, which is characterized by comprising the following steps:
step S1, manufacturing a T-beam template, positioning the template with the holes on the web plate in the span middle area of the beam rib unit, and installing the prestressed pipeline and the common steel bar;
step S2, prefabricating a bridge deck unit and a beam rib unit, wherein when the bridge deck unit adopts ultra-high performance concrete, the prefabricated beam rib unit and the bridge deck are integrally poured and steam curing is carried out; when the bridge deck unit is made of common concrete, firstly pouring the prefabricated ultrahigh-performance concrete beam rib units, after the beam rib units are cured by steam, erecting a formwork above the beam rib units for pouring construction, and combining the beam rib units and the beam rib units through the top shear connectors to form a T-shaped beam; a plurality of openings are formed in the web plate of the midspan area of the beam rib unit;
step S3, when the T-beam adopts the prestressed steel beam as the longitudinal stress steel bar, tensioning the prestressed force after the rib unit and the bridge deck unit of the T-beam are prefabricated to reach 90% of the design strength;
s4, transporting and hoisting the prefabricated T-shaped beam to form a single-span or multi-span bridge structure;
step S5, installing the bridge structure, specifically as follows:
if the bridge is a simple support structure, filling filler in wet joints of end diaphragm plates and mid-span diaphragm plates of two adjacent prefabricated T-beams in the transverse bridge direction for connection, and filling ultrahigh-performance concrete in the longitudinal wet joints of the bridge deck slab between every two adjacent T-beams in each span for connection and maintenance;
if the bridge deck is a multi-span bridge deck continuous and main beam simply-supported structure, filling materials are filled in wet joints of end diaphragm plates and span middle diaphragm plates of two adjacent prefabricated T-shaped beams in the transverse bridge direction for connection, and ultrahigh-performance concrete is filled in transverse wet joints of bridge decks at the ends of the two T-shaped beams for connection; concrete pouring is not carried out between the longitudinal main beams, and ultrahigh-performance concrete is filled between every two longitudinal T beams through the longitudinal wet joints of the bridge deck for connection and maintenance;
if the structure is a multi-span bridge deck continuous and main beam continuous structure, filling filler in the end diaphragm plates and the span-middle diaphragm plate wet joints of two adjacent prefabricated T beams in the transverse bridge direction for connection, and filling ultrahigh-performance concrete in the bridge deck transverse wet joints at the end parts of the two T beams for connection; the longitudinal main beams are connected by filling ultra-high performance concrete, and the longitudinal T beams of each span are connected and maintained by filling the ultra-high performance concrete through the longitudinal wet joints of the bridge deck;
and step S6, completing the construction of bridge deck pavement and auxiliary projects.
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