CN108755381A - One kind is for no reason every formula UHPC small box girder structures - Google Patents
One kind is for no reason every formula UHPC small box girder structures Download PDFInfo
- Publication number
- CN108755381A CN108755381A CN201810578590.4A CN201810578590A CN108755381A CN 108755381 A CN108755381 A CN 108755381A CN 201810578590 A CN201810578590 A CN 201810578590A CN 108755381 A CN108755381 A CN 108755381A
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- CN
- China
- Prior art keywords
- box girder
- top plate
- web
- uhpc
- bottom plate
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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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- 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
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
本发明公开了一种无端隔式UHPC小箱梁结构，包括多个相邻的箱梁本体，所述箱梁本体由超高性能混凝土预制形成，所述箱梁本体由顶板、底板、腹板及跨中隔板构成，所述箱体本体内沿纵向预埋有缓粘结预应力筋，所述腹板与底板、顶板之间具有加腋结构，所述腹板位于箱梁本体端部位置向内部分伸出形成局部增厚结构，箱梁本体由UHPC材料构成的薄壁箱梁，有效节省材料，梁重减轻了约40％，只在跨中设置隔板而在端部不设置隔板，辅以支座范围(端部)内的构造优化，在满足结构安全的前提下极大地方便了构件预制，缓粘结预应力筋预埋在箱梁本体内，进一步地节省材料，降低了梁高，避免了体外预应力束的腐蚀及更换问题，大大缩减了运营期间的维护成本。
The invention discloses a UHPC small box girder structure with no ends, comprising a plurality of adjacent box girder bodies, the box girder bodies are prefabricated from ultra-high performance concrete, and the box girder bodies are composed of a top plate, a bottom plate, and a web and the mid-span partition, the box body is pre-embedded with slow-bonded prestressed tendons along the longitudinal direction, and there is a haunch structure between the web, the bottom plate, and the top plate, and the web is located at the end of the box girder body The position protrudes inward to form a local thickening structure. The box girder body is a thin-walled box girder made of UHPC material, which effectively saves materials and reduces the beam weight by about 40%. Only partitions are installed in the middle of the span and not at the ends. The diaphragm, supplemented by structural optimization within the range of the support (end), greatly facilitates the prefabrication of components on the premise of satisfying structural safety, and the slow bonded prestressed tendons are pre-embedded in the box girder body, further saving materials. The beam height is reduced, the corrosion and replacement of external prestressed beams are avoided, and the maintenance cost during operation is greatly reduced.
Description
Technical field
The present invention relates to science of bridge building technical field of structures, more particularly to one kind is for no reason every formula UHPC small box girder structures.
Background technology
In recent years, China actively seek and enrich the interference of rapid, low road, mute Green Bridges mode of construction,
Bridge fabricated construction is vigorously advocated, and tries to explore application of the new material in packaged type bridges, having built large quantities of has
Representative packaged type bridges, the industrialized production of bridge, prefabricated construction have become main trend.
Although existing packaged type bridges category is various, all have the shortcomings that respective：There is steel construction site welding (bolt) to connect
Amount is big, steel bridge deck has fatigue cracking；Steel-mix composite structure dead weight it is larger, floorings can only partial precast, scene is poured
The amount of building is big；For prestressed reinforced concrete structure from great, lateral connection cracky, lasting hazard is more.UHPC materials are in method
The bridge field of the country such as state and Malaysia has obtained significant progress, but its theoretical research of China focus mostly in T-type beam,
In three kinds of forms of broad box girder and π types beam, blank is essentially to the research of UHPC small box girders, and there are more transverse directions for T-type girder construction
Contact, live seam is more, is unfavorable for rapid construction；Broad box girder realizes fabricated construction by box beam longitudinal direction piecemeal, and scene is applied
Work workload is big and complicated；For π types beam there is only bridge floor longitudinal seam, site operation is convenient, and eliminates prestressing force, avoids pre-
The girder antiarch difference that stress tension generates, to ensure that the quality of transverse joint, reduce Calculation of Thickness of Bridge Deck Pavement, but prestressing force
Missing cause bridge span limited.The shortcomings that in view of existing packaged type bridges, Development of Novel fabricated construction is with preferably suitable
It answers the requirement of national development green building to become to be badly in need of.
Invention content
Technical problem to be solved by the invention is to provide a kind of simple structure, easy construction for no reason every the small casees of formula UHPC
Girder construction.
Used technical solution to solve above-mentioned technical problem：It is a kind of for no reason every formula UHPC small box girder structures, including it is more
A adjacent box beam ontology, the box beam ontology is by the prefabricated formation of ultra-high performance concrete, and the box beam ontology is by top plate, bottom
Plate, web and span centre partition board are constituted, and delayed bonding prestressed tendon, the web and bottom are embedded with along longitudinal direction in the box-like body
There is haunch structure, the web to be located at box beam body end position inward portion and stretch out to form partial thickening between plate, top plate
Structure.
Preferably, the top plate and bottom plate is located at box beam body end position inward portion and stretches out to form partial thickening structure.
Preferably, the top plate and bottom plate and web increase positioned at box beam body end position thickness.
Preferably, the haunch structure is rounded structure.
Preferably, the delayed bonding prestressed tendon is embedded in bottom plate and web.
The perpendicular curved peace of delayed bonding prestressed tendon setting being preferably located in web is curved, and the slow cohesion being located in bottom plate is pre-
It is curved that stress rib is not provided with perpendicular curved peace.
Preferably, the top plate outer ledge of the box beam ontology is equipped with longitudinal notch, leads between the adjacent box beam ontology
Cast-in-place ultra-high performance concrete is crossed to form longitudinal seam and be connected with each other.
Preferably, the top plate outer ledge is embedded with outwardly directed connection reinforcing bar, the top of the adjacent box beam ontology
The connection reinforcing bar of plate mutually staggers.
Preferably, the plate outer side edge bottom extends downwardly thickening, and the connection reinforcing bar is embedded in top plate outer side edges
Edge bottom and the pre-buried part bending for stretching into top plate.
Advantageous effect：
(1) Thin-walled Box Girder that box beam ontology is made of UHPC (ultra-high performance concrete) material, saves material, beam subtracts again
It is light by about 40%, deck-molding can be effectively reduced, limit for height or landscape requirement Urban Bridge have been very suitable for；
(2) partition board only is set in span centre and is not provided with partition board in end, the constitution optimization being aided in bearing range (end),
Element precast is greatly facilitated under the premise of meeting structure safety, and is not provided with regular reinforcement in beam body, is avoided in vivo
Delayed bonding prestressed tendon conflicts with regular reinforcement, shortens reset time, more suitable for bridge industrialized production；
(3) longitudinal notch is arranged in the ceiling edge of box beam ontology, so that adjacent box beam ontology is connected using longitudinal usually seam,
Outer diaphragm plate is eliminated, seam quantity is few, greatly reduces live seam and pours and curing time, facilitates assembled in situ and apply
Work；
(4) in box beam ontology pre-buried minor diameter delayed bonding prestressed tendon, reduce box beam inner wall thickness, further save
Material utilization amount avoids the corrosion of steel beam and the replacement problem of external prestressing technique used by traditional UHPC box beams, significantly
Reduce the maintenance cost during operation.
Description of the drawings
The present invention is described further with reference to the accompanying drawings and examples；
Fig. 1 is the standard cross-section schematic diagram of adjacent box beam ontology connection in the embodiment of the present invention；
Fig. 2 is the span centre transverse sectional view of box beam ontology in the embodiment of the present invention；
Fig. 3 is the transverse sectional view of the end first embodiment of box beam ontology in the embodiment of the present invention；
Fig. 4 is the longitudinal cross-section schematic diagram of the end first embodiment of box beam ontology in the embodiment of the present invention；
Fig. 5 is the transverse sectional view of the end second embodiment of box beam ontology in the embodiment of the present invention；
Fig. 6 is the longitudinal cross-section schematic diagram of the end second embodiment of box beam ontology in the embodiment of the present invention；
Fig. 7 is the schematic cross-section that longitudinal seam connects in the embodiment of the present invention；
Fig. 8 is the schematic cross-section that longitudinal seam uses connection reinforcing bar in the embodiment of the present invention；
Fig. 9 is the floor map that longitudinal seam uses connection reinforcing bar in the embodiment of the present invention.
Specific implementation mode
Referring to figs. 1 to Fig. 9, the present invention is for no reason every formula UHPC small box girder structures, including multiple adjacent box beam ontologies 10, case
Beam ontology 10 by the prefabricated formation of ultra-high performance concrete, box beam ontology 10 can also use with ultra-high performance concrete (UHPC,
Ultra-High Performance Concrete) similar material, as CRC, DSP, FRHPC, HPFRCC, RPC, STC,
The high performance cement-base composite material such as UHPFRC, box beam ontology 10 is by top plate 11,14 structure of bottom plate 12, web 13 and span centre partition board
At, it is preferably Rouno Cormer Pregrinding Wheel to have haunch structure, haunch structure between web 13 and bottom plate 12, top plate 11, top plate 11, bottom plate 12,
The thickness of web 13 changes along longitudinal direction, i.e., top plate 11, bottom plate 12 and web 13 are in the position thickness positioned at 10 end of box beam ontology
Larger, other part thickness are relatively small.The Thin-walled Box Girder that box beam ontology is made of UHPC (ultra-high performance concrete) material, phase
For traditional box beam, material is more saved, beam alleviates about 40% again, can effectively reduce deck-molding, has been very suitable for limit for height or scape
Sight requires Urban Bridge.
In order to improve bridge span, the delayed bonding prestressed tendon 15 of minor diameter is embedded in box-like body 10 along longitudinal direction, is delayed
Binding prestress reinforcement 15 is only embedded in bottom plate 12, in web 13.The delayed bonding prestressed tendon 15 being preferably located in web 13 is set
It is curved to set perpendicular curved peace, it is curved that the delayed bonding prestressed tendon 15 in bottom plate 12 is not provided with perpendicular curved peace.Using the slow viscous of minor diameter
Presstressed reinforcing steel 15 is tied, box beam inner wall thickness can be reduced, further save material utilization amount, avoid traditional UHPC box beams institute
The steel beam of the external prestressing technique of use corrodes and replacement problem, and the maintenance cost during operation is greatly reduced.
In order to facilitate the prefabricated efficiency and raising small box girder space-load performance of small box girder, the only span centre in box beam ontology 10
Span centre partition board 14 is arranged in position, is not provided with end bulkheads in end position, but 13 inward portion of web is stretched at end position
Go out to be formed partial thickening structure 16, to resist section torsion and distortion load, as shown in Figures 3 and 4.
Preferably, in order to further improve small box girder end overall performance, top plate 11, bottom plate at end position
12 and 13 equal inward portion of web stretch out to form partial thickening structure 16, while intermediate there are sufficiently large manholes in order to internal model
It removes, as illustrated in Figures 5 and 6.
It is that one is connected to form by longitudinal seam 20 between adjacent box beam ontology 10, specifically, each box beam ontology 10
11 outer ledge bottom of top plate extend downwardly thickening, it is longitudinal to improve and in centre setting longitudinal notch 111 with Transfer of Shear
20 transmission force property of seam, when box beam ontology 10 is prefabricated, 11 outer ledge of top plate is embedded with outwardly directed connection reinforcing bar 112, even
The anchorage length of reinforcing bar, the connection of the top plate 11 of adjacent box beam ontology 10 should be able to be met by connecing the length of the embedment top plate 11 of reinforcing bar 112
Reinforcing bar 112 is staggeredly arranged, and is filled by cast-in-place UHPC materials to realize that adjacent box beam ontology 10 is connected with each other.
Preferably, the pre-buried part bending for stretching into top plate 11 of connection reinforcing bar 112, is added with adapting to the lateral part of top plate 11
Thickness construction.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned embodiment party
Formula, the technical field those of ordinary skill within the scope of knowledge, can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810578590.4A CN108755381A (en) | 2018-06-07 | 2018-06-07 | One kind is for no reason every formula UHPC small box girder structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810578590.4A CN108755381A (en) | 2018-06-07 | 2018-06-07 | One kind is for no reason every formula UHPC small box girder structures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108755381A true CN108755381A (en) | 2018-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810578590.4A Withdrawn CN108755381A (en) | 2018-06-07 | 2018-06-07 | One kind is for no reason every formula UHPC small box girder structures |
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| CN (1) | CN108755381A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110656566A (en) * | 2019-09-23 | 2020-01-07 | 中铁二局第三工程有限公司 | Assembled combined box girder and construction method thereof |
| CN112575634A (en) * | 2020-12-24 | 2021-03-30 | 中铁第四勘察设计院集团有限公司 | Magnetic suspension UHPC case roof beam |
| CN115287995A (en) * | 2022-09-05 | 2022-11-04 | 湖南大学 | Large-section prefabricated assembled UHPC small box girder bridge and construction method thereof |
-
2018
- 2018-06-07 CN CN201810578590.4A patent/CN108755381A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110656566A (en) * | 2019-09-23 | 2020-01-07 | 中铁二局第三工程有限公司 | Assembled combined box girder and construction method thereof |
| CN112575634A (en) * | 2020-12-24 | 2021-03-30 | 中铁第四勘察设计院集团有限公司 | Magnetic suspension UHPC case roof beam |
| CN115287995A (en) * | 2022-09-05 | 2022-11-04 | 湖南大学 | Large-section prefabricated assembled UHPC small box girder bridge and construction method thereof |
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| WW01 | Invention patent application withdrawn after publication | ||
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Application publication date: 20181106 |