CN108755382B - Pre-buried steel plate UHPC small box girder structure - Google Patents
Pre-buried steel plate UHPC small box girder structure Download PDFInfo
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- CN108755382B CN108755382B CN201810584318.7A CN201810584318A CN108755382B CN 108755382 B CN108755382 B CN 108755382B CN 201810584318 A CN201810584318 A CN 201810584318A CN 108755382 B CN108755382 B CN 108755382B
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- box girder
- steel plate
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- outer side
- plate
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 16
- 210000002435 tendon Anatomy 0.000 claims abstract description 16
- 238000005192 partition Methods 0.000 claims abstract description 13
- 238000003466 welding Methods 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 230000008719 thickening Effects 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 2
- 238000005452 bending Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 7
- 238000009415 formwork Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- 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
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses an embedded steel plate type UHPC small box girder structure, which comprises a plurality of box girder bodies connected through longitudinal joints, wherein the box girder bodies are formed by prefabricating ultra-high performance concrete, the box girder bodies are formed by a top plate, a bottom plate, a web plate, a span middle partition plate and end partition plates, slow-bonding prestressed tendons are longitudinally embedded in the box girder bodies, an inner side steel plate embedded part and an outer side steel plate embedded part are embedded in the end parts of the box girder bodies, the inner side steel plate embedded part is fixedly welded with an inner side template, the outer side steel plate embedded part is fixedly welded with the outer side template, the end partition plates are integrally cast between the inner side template and the outer side template, the box girder body is a thin-wall box girder formed by UHPC materials, materials are effectively saved, the girder weight is reduced by about 40%, the slow-bonding prestressed tendons are embedded in the box Liang Ben, the materials are further saved, the girder height is avoided, the corrosion and the replacement problem of an external prestressed girder is greatly reduced, and the maintenance cost during operation is greatly reduced.
Description
Technical Field
The invention relates to the technical field of bridge engineering structures, in particular to a pre-buried steel plate type UHPC small box girder structure.
Background
In recent years, china actively searches and enriches the rapid, low-road-interference and mute green bridge construction modes, so that bridge assembly construction is advocated, the application of novel materials in the assembly bridge is actively explored, a large number of representative assembly bridges are constructed, and the industrial production and assembly construction of the bridge have become a great trend.
Although the existing assembly bridge Liang Pinlei is diverse, there are respective drawbacks: the steel structure has the problems of large field welding (bolt) quantity and fatigue cracking of the steel bridge deck; the steel-concrete combined structure has larger dead weight, the bridge deck can only be partially prefabricated, and the cast-in-place quantity is large; the prestressed reinforced concrete structure has large self weight, easy breakage in transverse connection and more durable diseases. The UHPC material is developed in the bridge fields of France, malaysia and other countries, but theoretical research in China is mainly focused on three forms of a T-shaped beam, a wide box beam and a pi-shaped beam, the research on a small UHPC box beam is basically blank, and the T-shaped beam structure has more transverse links and more field joints, so that the quick construction is not facilitated; the wide box girder realizes assembly type construction through longitudinal block of the box girder, and the field construction workload is large and complex; the pi-shaped beam only has bridge deck longitudinal joints, is convenient to construct on site, eliminates prestress, avoids the difference of main beam arches generated by prestress tensioning, thereby ensuring the quality of transverse joints, reducing the bridge deck pavement thickness, but the bridge span is limited due to the lack of prestress. In view of the shortcomings of existing fabricated bridges, it is becoming an urgent need to develop new fabricated structures to better accommodate the national requirements for developing green buildings.
Disclosure of Invention
The invention aims to solve the technical problem of providing the embedded steel plate type UHPC small box girder structure which is simple in structure and convenient to construct.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides an embedded steel plate UHPC small box girder structure, includes a plurality of adjacent box girder bodies, the box girder body is prefabricated by ultra-high performance concrete and forms, the box girder body comprises roof, bottom plate, web, span middle baffle and tip baffle, be equipped with in the box Liang Ben along vertical pre-buried retarded adhesive prestressing tendons the roof, bottom plate and the web that box girder body tip is in same cross-section position correspond respectively and have roof preformed hole, bottom plate preformed hole and web preformed hole, it has vertical reinforcing bar to alternate between roof preformed hole and the bottom plate preformed hole, control two alternate between the web preformed hole has transverse reinforcement, set up inboard steel plate embedded part, outside steel plate embedded part respectively in roof preformed hole, bottom plate preformed hole and web preformed hole front and back both sides be equipped with in the box girder body tip with inboard template and outside steel plate embedded part welded connection's outside template, pour an organic whole between inboard template and outside template and form the tip baffle.
Preferably, the slow-bonding prestressed tendons are pre-buried in the bottom plate and the web plate.
Preferably, the slow-bonding prestressed tendons in the webs are provided with vertical bends and flat bends, and the slow-bonding prestressed tendons in the bottom plates are not provided with vertical bends and flat bends.
Preferably, the top plate, the bottom plate and the web plate are increased in thickness at the end position of the box girder body.
Preferably, the inner steel plate embedded part and the outer steel plate embedded part are formed by welding steel plates and bolts, and the bolts are embedded into the top plate, the bottom plate and the web plate.
Preferably, the inner side template and the outer side template are respectively provided with corresponding template studs in an arrangement mode, and the template studs on the inner side template and the outer side template are arranged in a staggered mode.
Preferably, the material poured to form the end baffles is plain concrete.
Preferably, the outer side edge of the top plate of the box girder body is provided with a longitudinal notch, and the adjacent box girder bodies are connected with each other by forming a longitudinal seam through cast-in-situ ultra-high performance concrete.
Preferably, the connecting bars extending outwards are embedded in the outer side edges of the top plates, and the connecting bars of the top plates of the adjacent box girder bodies are staggered.
Preferably, the bottom of the outer side edge of the bottom plate extends downwards to be thickened, and the connecting bars are embedded in the bottom of the outer side edge of the top plate and are embedded in the portion extending into the top plate to be bent.
The beneficial effects are that:
(1) The box girder body is a thin-wall box girder made of UHPC (ultra-high performance concrete) material, so that the material is saved, the girder weight is reduced by about 40%, the girder height can be effectively reduced, and the box girder is very suitable for urban bridges with limited heights or landscape requirements;
(2) The small-diameter slow-bonding prestressed tendons are pre-embedded in the box girder body, so that the thickness of the inner wall of the box girder is reduced, the material consumption is further saved, the problems of steel beam corrosion and replacement of the external prestressing technology adopted by the traditional UHPC box girder are avoided, and the maintenance cost during operation is greatly reduced;
(3) The edge of the top plate of the box girder body is provided with the longitudinal notch, the adjacent box girder bodies are connected by adopting the longitudinal common joints, the outer transverse partition plates are omitted, the number of the joints is small, the on-site joint pouring and maintenance time is greatly shortened, and the on-site assembly construction is convenient.
(4) The common steel bars are not longitudinally arranged in the beam body, so that the conflict between the in-vivo slow-bonding prestressed tendons and the common steel bars is avoided, the prefabrication time is shortened, and the method is more suitable for industrial production of bridges.
Drawings
The invention is further described below with reference to the drawings and examples;
FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a box girder body according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an end portion of a girder body according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a longitudinal seam in an embodiment of the invention;
FIG. 5 is a schematic cross-sectional view of a longitudinal seam in an embodiment of the invention;
fig. 6 is a schematic cross-sectional view of a longitudinal seam employing connecting bars in an embodiment of the present invention;
fig. 7 is a schematic plan view of a longitudinal seam employing connecting bars in an embodiment of the present invention.
Detailed Description
Referring to fig. 1 to 7, the pre-buried steel plate type UHPC small box girder structure of the present invention comprises a plurality of adjacent box girder bodies 10, the box girder bodies 10 are prefabricated by Ultra-high performance concrete, the box girder bodies 10 can also be made of materials similar to Ultra-high performance concrete (UHPC, ultra-High Performance Concrete), such as CRC, DSP, FRHPC, HPFRCC, RPC, STC, UHPFRC and other high performance cement-based composite materials, the box girder bodies 10 are composed of top plates 11, bottom plates 12, webs 13, mid-span partition plates 14 and end partition plates 15, the thicknesses of the top plates 11, the bottom plates 12 and the webs 13 vary along the longitudinal direction, namely, the thicknesses of the top plates 11, the bottom plates 12 and the webs 13 at the positions at the end parts of the box girder bodies 10 are larger, and the thicknesses of other positions are relatively smaller. Compared with the traditional box girder, the thin-wall box girder formed by UHPC (ultra-high performance concrete) material is more material-saving, the girder weight is reduced by about 40%, the girder height can be effectively reduced, and the box girder is very suitable for urban bridges with limited heights or landscape requirements.
In order to improve bridge span, the box girder body 10 is internally pre-embedded with slow-bonding prestressed tendons 16 with small diameters along the longitudinal direction, and the slow-bonding prestressed tendons 16 are only pre-embedded in the bottom plate 12 and the web 13. Preferably, the slow-bond tendons 16 in the web 13 are provided with vertical bends and horizontal bends, and the slow-bond tendons 16 in the bottom plate 12 are not provided with vertical bends and horizontal bends. The adoption of the small-diameter slow-bonding prestressed tendons 16 can reduce the thickness of the inner wall of the box girder, further save the material consumption, avoid the problems of steel beam corrosion and replacement of the external prestressing technology adopted by the traditional UHPC box girder, and greatly reduce the maintenance cost during operation.
The box girder body 10 is prefabricated by an inner template, an outer template, a top plate 11, a bottom plate 12, a web 13 and a middle-span baffle 14, wherein the top plate 111, the bottom plate 121 and the web 131 are respectively arranged on the top plate 11, the bottom plate 12 and the web 13, simultaneously, an inner side steel plate embedded part 17 and an outer side steel plate embedded part 18 are respectively embedded on the top plate 11, the bottom plate 12 and the web 13, the inner side steel plate embedded part 17 and the outer side steel plate embedded part 18 are respectively arranged on the front side and the rear side of the embedded hole, the inner side steel plate embedded part 17 and the outer side steel plate embedded part 18 are respectively formed by welding steel plates and bolts, the bolts are embedded in the top plate 11, the bottom plate 12 and the web 13, the vertical steel bars 20 are inserted between the top plate preformed holes 111 and the bottom plate preformed holes 121, the transverse steel bars 30 are inserted between the left web preformed holes 131 and the right web preformed holes 131, the inner side templates 40 and the outer side templates 50 are respectively arranged on the front side and the rear side of the vertical steel bars 20 and the transverse steel bars 30, the inner side templates 40 are welded and fixed with the inner side steel plate embedded parts 17, the outer side templates 50 are welded and fixed with the outer side steel plate embedded parts 18, the welding positions of the inner side templates 40 and the outer side templates 50 can be flexibly adjusted, the interval distance between the inner side templates 40 and the outer side templates 50 can be flexibly adjusted, UHPC is cast in situ through the top plate preformed holes 111, and the end partition 15 is permanently formed integrally with the inner side templates and the outer side templates.
In order to reduce the amount of UHPC material, the cast-in-place UHPC material may be replaced by casting ordinary concrete, and the distance between the outer form 50 and the inner form 40 increases.
Preferably, in order to further improve the integrity of the end partition plate 15 and the girder body 10, corresponding formwork studs are respectively arranged and distributed on the end surfaces of the inner side formworks 40 and the outer side formworks 50, which are contacted with the end partition plate 15, and when the lengths of the formwork studs are longer, the formwork studs on the inner side formworks and the outer side formworks are staggered and avoid the inserted vertical steel bars and the inserted transverse steel bars.
The adjacent box girder bodies 10 are connected through the longitudinal joint 60 to form a whole, specifically, the bottoms of the outer edges of the top plates 11 of the box girder bodies 10 extend downwards to be thickened, longitudinal notches 112 are formed in the middle to transfer shearing force, when the box girder bodies 10 are prefabricated to improve the force transmission performance of the longitudinal joint 60, connecting steel bars 113 extending outwards are embedded in the outer edges of the top plates 11, the length of the connecting steel bars 113 embedded in the top plates 11 can meet the anchoring length of the steel bars, the connecting steel bars 113 of the top plates 11 of the adjacent box girder bodies 10 are staggered mutually, and the adjacent box girder bodies 10 are mutually connected by filling in a cast-in-situ UHPC material.
Preferably, the connecting bars 113 are bent at portions extending into the top plate 11 in advance to accommodate the lateral partial thickening of the top plate 11.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (10)
1. An embedded steel plate type UHPC small box girder structure is characterized in that: the box girder comprises a plurality of adjacent box girder bodies, the box girder bodies are formed by prefabricating ultra-high performance concrete, the box girder bodies are formed by top plates, bottom plates, webs, span middle partition plates and end partition plates, slow-bonding prestressed ribs are longitudinally pre-embedded in the box Liang Ben, the top plates, the bottom plates and the webs which are positioned at the same section position at the ends of the box girder bodies are respectively provided with top plate preformed holes, bottom plate preformed holes and web preformed holes in a corresponding mode, vertical reinforcing steel bars are inserted between the top plate preformed holes and the bottom plate preformed holes, transverse reinforcing steel bars are inserted between the left web preformed holes and the right web preformed holes, inner side steel plate embedded parts and outer side steel plate embedded parts are respectively arranged at the front side and the rear side of the top plate preformed holes, the bottom plate preformed holes and the web preformed holes, an inner side template welded with the inner side steel plate embedded parts and an outer side template welded with the outer side steel plate embedded parts are arranged in the box girder body ends, and the end partition plates are integrally cast between the inner side template and the outer side template.
2. The embedded steel plate type UHPC small box girder structure according to claim 1, wherein: the slow-bonding prestressed tendons are pre-buried in the bottom plate and the web plate.
3. The embedded steel plate type UHPC small box girder structure according to claim 2, wherein: the slow-bonding prestressed tendons in the webs are provided with vertical bends and flat bends, and the slow-bonding prestressed tendons in the bottom plates are not provided with vertical bends and flat bends.
4. A pre-buried steel plate type UHPC small box girder structure according to any one of claims 1-3, characterized in that: the thickness of the top plate, the bottom plate and the web plate is increased at the end part of the box girder body.
5. The embedded steel plate type UHPC small box girder structure according to claim 1, wherein: the inner steel plate embedded part and the outer steel plate embedded part are formed by welding steel plates and studs, and the studs are embedded into the top plate, the bottom plate and the web plate.
6. The embedded steel plate type UHPC small box girder structure according to claim 5, wherein: corresponding template pegs are respectively arranged and distributed on the inner side template and the outer side template, and the template pegs on the inner side template and the outer side template are staggered.
7. The embedded steel plate type UHPC small box girder structure according to claim 1, wherein: the material for casting the end partition plates is ordinary concrete.
8. The embedded steel plate type UHPC small box girder structure according to claim 1, wherein: the outer side edge of the top plate of the box girder body is provided with a longitudinal notch, and the adjacent box girder bodies are connected with each other by forming a longitudinal joint through cast-in-situ ultra-high performance concrete.
9. The pre-buried steel plate type UHPC small box girder structure according to claim 8, wherein: connecting bars extending outwards are embedded in the outer side edges of the top plates, and the connecting bars of the top plates of the adjacent box girder bodies are staggered.
10. The embedded steel plate type UHPC small box girder structure according to claim 9, wherein: the bottom plate outside edge bottom downwardly extending thickening, the connecting rod is pre-buried in roof outside edge bottom and pre-buried portion bending that stretches into the roof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810584318.7A CN108755382B (en) | 2018-06-07 | 2018-06-07 | Pre-buried steel plate UHPC small box girder structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810584318.7A CN108755382B (en) | 2018-06-07 | 2018-06-07 | Pre-buried steel plate UHPC small box girder structure |
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| Publication Number | Publication Date |
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| CN108755382A CN108755382A (en) | 2018-11-06 |
| CN108755382B true CN108755382B (en) | 2024-01-30 |
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| CN201810584318.7A Active CN108755382B (en) | 2018-06-07 | 2018-06-07 | Pre-buried steel plate UHPC small box girder structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109778664A (en) * | 2019-03-20 | 2019-05-21 | 中铁二院工程集团有限责任公司 | A kind of lightweight prestressed concrete beam bridge structure |
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| KR100989153B1 (en) * | 2010-04-07 | 2010-10-22 | 주식회사 오케이컨설턴트 | Psc girder connection structure with strength connector detail for substitution of rebar placement in deck and bridge construction method using the same |
| CN202323669U (en) * | 2011-11-04 | 2012-07-11 | 湖南大学 | Prestressed ultrahigh-performance concrete continuous box girder bridge |
| CN203593939U (en) * | 2013-11-25 | 2014-05-14 | 湖南大学 | Connecting structure of concrete beams differing in performance |
| CN104929034A (en) * | 2015-06-25 | 2015-09-23 | 浙江大学 | Small modularized steel-concrete rapid-construction box girder bridge and construction method thereof |
| CN105714684A (en) * | 2016-02-24 | 2016-06-29 | 中国一冶集团有限公司 | Prestressed concrete variable cross-section fish-bellied type continuous box girder construction method |
| CN107245934A (en) * | 2017-07-31 | 2017-10-13 | 哈尔滨工业大学 | A kind of assembled steel profiled sheet concrete combined board small box girder |
| CN208440964U (en) * | 2018-06-07 | 2019-01-29 | 广州市市政工程设计研究总院有限公司 | A kind of board-like UHPC small box girder structure of pre-buried steel |
-
2018
- 2018-06-07 CN CN201810584318.7A patent/CN108755382B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100989153B1 (en) * | 2010-04-07 | 2010-10-22 | 주식회사 오케이컨설턴트 | Psc girder connection structure with strength connector detail for substitution of rebar placement in deck and bridge construction method using the same |
| CN202323669U (en) * | 2011-11-04 | 2012-07-11 | 湖南大学 | Prestressed ultrahigh-performance concrete continuous box girder bridge |
| CN203593939U (en) * | 2013-11-25 | 2014-05-14 | 湖南大学 | Connecting structure of concrete beams differing in performance |
| CN104929034A (en) * | 2015-06-25 | 2015-09-23 | 浙江大学 | Small modularized steel-concrete rapid-construction box girder bridge and construction method thereof |
| CN105714684A (en) * | 2016-02-24 | 2016-06-29 | 中国一冶集团有限公司 | Prestressed concrete variable cross-section fish-bellied type continuous box girder construction method |
| CN107245934A (en) * | 2017-07-31 | 2017-10-13 | 哈尔滨工业大学 | A kind of assembled steel profiled sheet concrete combined board small box girder |
| CN208440964U (en) * | 2018-06-07 | 2019-01-29 | 广州市市政工程设计研究总院有限公司 | A kind of board-like UHPC small box girder structure of pre-buried steel |
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| CN108755382A (en) | 2018-11-06 |
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