CN105672112A - Concrete box girder bridge web reinforcing hole based on double-deck traffic - Google Patents
Concrete box girder bridge web reinforcing hole based on double-deck traffic Download PDFInfo
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- CN105672112A CN105672112A CN201510967156.1A CN201510967156A CN105672112A CN 105672112 A CN105672112 A CN 105672112A CN 201510967156 A CN201510967156 A CN 201510967156A CN 105672112 A CN105672112 A CN 105672112A
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- box girder
- stirrup
- concrete box
- web
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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
- 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
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Abstract
The invention provides a concrete box girder bridge web reinforcing hole based on double-deck traffic. The technical scheme that a framework is formed in the manner that multiple stirrups are arranged on the periphery of the hole to be combined with and fixed to pull rods to form an annular frame or a strip frame, and then formwork erecting pouring molding is conducted is adopted. The defects that stress concentration is likely to happen in the box girder bridge web hole forming position, and consequently the overall stress performance of a box girder is greatly weakened are overcome. The concrete box girder bridge web reinforcing hole is suitable for being used as open holes of various closed box girder webs and particularly suitable for being used as large-diameter open holes of a concrete box girder bridge web for multi-deck traffic.
Description
Technical field
The present invention relates to a kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web.
Background technology
Development along with China's economic, urban land resource growing tension, the quick growth of traffic flow simultaneously, most built Urban Bridge is caused day by day to block up, the existing Urban Bridge in the world is faced with the Missions of sustainable development, although bridge being widened and can alleviating traffic flow, but can in the face of the various difficult problems such as build that the design and construction difficulty of wide bridge, floor space be big and cost is high, therefore to improve the current condition of bridge, the urban bridge design of double-layer traffic or double deck is preferred version; The development of double-decker bridge can be divided into two stages, i.e. steel truss double-decker bridge and two stages of prestressed concrete box girder double-decker bridge; Comparatively speaking, the former technology relative maturity, but cost is higher, is mainly applied in across river, the Longspan Bridge of cross a river, achieved with good economic benefit in project investment etc.; Latter configuration form possesses all advantages of box-beam structure, and more nervous for land used, cost is more expensive, version is comparatively single city, the little span i.e. Urban Bridge of 30～60m are comparatively practical; But in order to meet ventilation inside box girder bridge, daylighting, in case of emergency can escape and alleviate box beam deadweight needs, the double-decker bridge web place of prestressed concrete box girder have to open the hole of some necessity, this will make the holistic resistant behavior of box beam significantly weaken, and can cause the unfavorable factors such as stress concentration, intensity substantially reduction at tapping.
Summary of the invention
For above-mentioned situation, it is an object of the invention to provide a kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web, it can meet ventilation, daylighting; Deadweight can be alleviated again; Can also in case of emergency be used as passway for escaping; And because the periphery in hole adopts the enhancing structure that is combined with pull bar of stirrup, its stress performance is good, bending resistance, shear resistance are strong, and local bearing capacity height can be prevented effectively from the stress concentration of box girder web tapping.
To achieve these goals, a kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web, the skeleton of hole periphery is fixed into skirt or strip frame by several stirrups through pull bar, builds molding then through formwork.
In order to realize structure, effect optimization, its further step is:
A kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web, the layering of described stirrup is laid in radial and axial.
A kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web, described stirrup two layers is laid in radial and axial.
A kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web, described stirrup three layers is laid in radial and axial.
A kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web, described pull bar is radially uniformly laid.
A kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web, the skeleton being used in hole periphery is fixed into skirt or strip frame by several stirrups through pull bar, builds molding then through formwork; It is radial and axial that stirrup divides more than two layers or three layers or three layers to be laid in; The technical scheme that pull bar is radially uniformly laid; Overcome box girder bridge web holes place to concentrate easily caused by stress, cause the defect that box beam holistic resistant behavior weakens significantly.
The present invention is produced beneficial effect compared to existing technology:
(I) present invention is used in the periphery in reinforced hole and arranges several stirrup and be combined into skeleton with pull bar, builds the technical scheme of molding then through formwork; The intensity making box girder web tapping is obviously enhanced, and shear resistant capacity is greatly improved, and preferably resolves existing box girder web tapping shear-carrying capacity not enough, it is easy to the defect of damage;
(II) present invention is used in the periphery in reinforced hole and arranges double-deck multiple tracks stirrup and be combined into skeleton with pull bar, builds the technical scheme of molding then through formwork; The unbending making box girder web tapping is remarkably reinforced, and improves bending resistance;
(III) present invention is used in the periphery in reinforced hole and arranges multilamellar multiple tracks stirrup and be combined into skeleton with pull bar, builds the technical scheme of molding then through formwork; The overall anti-twisting property making box girder web tapping strengthens, and effectively prevent tapping and turns round bad generation;
(IV) present invention is used in the periphery in reinforced hole and arranges multilamellar multiple tracks stirrup and be combined into skeleton with pull bar, builds the technical scheme of molding then through formwork; Add tapping ventilation, daylighting, emergency danger-avoiding escaping and alleviate the multiple functions such as deadweight;
(V) present invention is used in the periphery in reinforced hole and arranges multilamellar multiple tracks stirrup and be combined into skeleton with pull bar, builds the technical scheme of molding then through formwork; Improve the stress performance of tapping, tapping can be prevented effectively from and produce to destroy because of stress concentration and Lack of support;
(VI) present invention is used in the periphery in reinforced hole and vertically lays stirrup and be combined into skeleton with pull bar, builds the technical scheme of molding then through formwork; Improve tapping box beam shearing resistance in curved scissors district and bending resistance square performance, effectively prevent the destruction that tapping causes because of stress concentration and Lack of support;
(VII) present invention is used in the periphery in reinforced hole and vertically lays stirrup and be combined into skeleton with pull bar, builds the technical scheme of molding then through formwork; Improve tapping box beam shearing resistance in curved scissors district and bending resistance square performance, make oblique principal tensile stress and the vertical principal stress of stirrup in tapping section obtain liquidating and balance, effectively stop and eliminate generation and the development of diagonal crack;
(VIII) to be used in the periphery in reinforced hole vertical and laterally lay multilamellar multiple tracks stirrup and be combined into skeleton with pull bar for the present invention, builds the technical scheme of molding then through formwork; The multiple tracks stirrup of each layer and pull bar, can well play the effect of constraint circumferential concrete, make concrete be in three dimension stress state, thus can well improve concrete comprcssive strength; And then improve perforate surrounding and the stress performance of whole box beam; Ensure that the security performance in the reinforced hole of box beam.
The present invention is suitable as the perforate of the box girder web of various closing, is particularly suitable for making the big circle cutting of multilamellar traffic concrete box beam bridge web.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is that the present invention is a kind of based on the lateral cross section front view showing web position in the reinforced hole of double-layer traffic concrete box beam bridge web.
Fig. 2 is a kind of web holes position, limit perspective view based on double-layer traffic concrete box-beam bridge of the present invention.
Fig. 3 is the reinforcing bar laying structure figure in the reinforced hole of median ventral plate of the present invention.
Fig. 4 is the reinforcing bar laying structure figure in the reinforced hole of median ventral plate of the present invention.
Fig. 5 is the toroidal frame basket structure figure in the reinforced hole of median ventral plate of the present invention.
Fig. 6 is the kidney-shaped frame basket structure figure in the reinforced hole of median ventral plate of the present invention.
Fig. 7 is the toroidal frame cage hierarchical diagram in the reinforced hole of median ventral plate of the present invention.
Fig. 8 is that the present invention is a kind of based on double-layer traffic concrete box-beam bridge skeleton lateral cross section Front view 1.
Fig. 9 is that the present invention is a kind of based on double-layer traffic concrete box-beam bridge skeleton lateral cross section Front view 2.
Detailed description of the invention
Shown in accompanying drawing, the work of the present invention and principle: a kind of based on the reinforced hole of double-layer traffic concrete box beam bridge web, the skeleton (1) of hole periphery is fixed into skirt (4) or strip frame (5) by several stirrups (2) through pull bar (3), builds molding then through formwork; More than stirrup (2) points two layers or three layers or three layers it is laid in radial and axial; Pull bar (3) is radially uniformly laid.
In conjunction with accompanying drawing, the present invention proposes a kind of effective ways strengthened for double-layer traffic concrete box beam bridge web tapping, namely it is open circular hole place at double-layer traffic concrete box web to arrange double-deck stirrup ring specifically, arrange twice stirrup for each layer, arrange around stirrup that some steel bar rods hold stirrup, in order to the power being subject on stirrup can spread out of. Open the stress performance at circular hole place and the holistic resistant behavior of box beam improving box girder web.
Fig. 1 is the layout sketch of the function of double-layer traffic box beam, and top board and base plate all as bridge deck, all can be able to be open to traffic. Time weather environment is severe, top board bridge deck can be closed, and base plate bridge deck still can be passed through. Thus can significantly alleviate the traffic pressure in city, well improve the utilization rate in soil. Such as Sai Van Bridge in Macau adopts Huge Box Beam to be open to traffic to realize bilayer. In January, 2005 opening of this bridge is open to traffic, and operation for many years also demonstrates the reliability and stability of double-layer traffic box beam.
Fig. 2 is the arrangement of reinforcement of the limit web of double-layer traffic concrete box girder, in order to meet ventilation, daylighting, deadweight of escaping, alleviate requirement on the limit web of box beam, opened three holes, represent that the overall condition of circular hole opened by web according in the scale model figure of 1:6 1 and 3, as can be seen from the figure the bore size of experimental model is diameter is 380mm, so the Circularhole diameter of reality has reached more than 2 meters. Scheme upper 2 overall condition representing the perforate of web middle, being similar to such as the shape of a stadium of track and field, model height 380mm, middle straight line segment width 760mm. is in sum, actual size has fully met ventilation, daylighting, require that of escape, and greatly alleviates the deadweight of structure. But so big hole certainly will be concentrated producing stress, and the bearing capacity of tapping also can be substantially reduced. This problem place that patent of the present invention to solve just.
Fig. 3 is the structure chart that circular hole place stirrup ring opened by limit web, Fig. 4 is the structure chart that bar hole place stirrup ring opened by limit web, (4) represent that the stirrup ring figure that circular hole place arranges is opened on web both sides, limit, open circular hole place and arrange double-deck stirrup ring, arrange twice for each layer.The spacing of two-layer stirrup ring is 50mm, and internal layer stirrup ring diameter is 400mm, and outer layer stirrup ring diameter is 500mm, and annulus reinforcing bar adopts diameter to be the reinforcing bar of 10. Annulus surrounding arranges that some radioactivity steel bar rods hold stirrup ring, makes the power being subject on stirrup ring to spread out of. Steel bar rod is also adopted by the reinforcing bar that diameter is 10. The hole considered out is relatively larger, thus arranges double-deck stirrup. The amount of reinforcement of stirrup adopts the principle of equivalence stringing. That is the consumption of stirrup does not as far as possible have a tapping equal to web and the consumption of reinforcing bar arranged at tapping. In figure, A means that pull bar, and the length of steel bar rod is used uniformly across 200mm length, and a stirrup annulus one does not know 8 radioactivity steel bar rods. (5) represent the structure chart of web central aperture place, limit stirrup ring, stirrup ring be shaped like in the shape of a stadium of track and field, owing to the hole opened in the middle of web is bigger, so middle hoop ring adopts diameter to be the reinforcing bar of 12. The same arrangement length of surrounding is the steel bar rod of 200mm, altogether 12 steel bar rods, and employing is arranged symmetrically with. In figure, B represents the steel bar rod around stirrup ring, is used uniformly across same size.
Fig. 5 represents the structure chart of middle pectoral plate tapping web, what our box beam model was opened at middle pectoral plate place is all small sircle hole, mainly meet the requirement in emergency escape, equally also can reach to alleviate the requirement of deadweight, middle pectoral plate has opened three small sircle holes altogether, also being adopt the principle being arranged symmetrically with, in figure, 6,7,8 represent the web concrete condition at three tappings. Shape and the size in the hole that middle pectoral plate is opened are just the same, thus are easy to construction. Adopt the form of circular hole opened, not only look better appearance, and tapping stress performance also other open-cellular forms are better relatively.
Fig. 6 is the structure chart of median ventral plate tapping stirrup ring, and the diameter of nexine stirrup ring is 200mm, and the diameter of outer layer stirrup ring is that each layer of 300mm. arranges twice stirrup. Consider that bore size is relatively small, so stirrup ring adopts diameter to be the reinforcing bar of 6mm. Stirrup ring surrounding adopts radioactivity steel bar rod to hold annulus equally. The power being subject on stirrup ring is made to spread out of. In figure, C represents radioactivity steel bar rod. Pull bar adopts diameter to be the reinforcing bar of 10mm. The length of steel bar rod is similarly 200mm, and the consumption of stirrup adopts the principle of equivalence stringing equally as far as possible. The reinforcing bar inside box beam thus can be made to form an overall steel skeleton, be so possible not only to be greatly improved box beam tapping local pressure performance, and can also well improve the holistic resistant behavior of box beam.
Fig. 7 is box beam top board cross section layout drawing, top board cross section width 3000mm, and length is 6000mm, and 1-1 and 2-2 locates cutting and comes the sectional view at the web holes place just obtaining Fig. 8 and Fig. 9 in the drawings. Box beam perforate is taked to be arranged symmetrically with, so the sectional view obtained in the symmetric position cutting of 1-1 is the same with Fig. 8, so no longer individually listing.
Fig. 8 is the web plate section structural plan that the cutting of 1-1 section obtains in the figure 7, will become apparent from middle one and opened four holes from Fig. 8, and the size in hole that the hole of Bian Shangkai is substantially opened than centre is big. The stirrup ring of intermediate arrangement adopts diameter to be the reinforcing bar of 6mm. Consider that the hole opened on limit is relatively large, so stirrup ring adopts diameter to be the reinforcing bar of 10mm on limit. On the cross section of whole Fig. 8, so define a reinforced steel bar ring. So the stress performance in whole cross section is also good.First will not destroy because tapping stress concentrates weak with stress performance.
Fig. 9 is that 2-2 cross section cutting in the figure 7 is come the web plate section structural plan obtained, and Fig. 9 and Fig. 8 is distinctive in that the hole opened on Fig. 9 limit is not circular hole, and is analogous to the ring-type of stadium of track and field. Refer to the right figure in Fig. 3. Consider that the hole dimension opened on limit is relatively big, thus stirrup ring adopts diameter to be the reinforcing bar of 12mm. The reinforcing bar that middle little stirrup ring adopts diameter to be 6mm equally. Tapping in the drawings is all arrange double-deck stirrup ring, and each layer of spacing arranging twice two-layer stirrup ring is that 50mm. and Fig. 8 is the same, and whole cross section defines a reinforced steel bar ring, it is ensured that the stress performance in whole cross section.
Claims (5)
1. one kind based on the reinforced hole of double-layer traffic concrete box beam bridge web, it is characterised in that it includes laying several through holes at web, and bore periphery arranges skeleton, and skeleton is configured to toroidal frame cage or kidney-shaped frame cage by stirrup and pull bar, builds molding through formwork.
2. one according to claim 1 is based on the reinforced hole of double-layer traffic concrete box beam bridge web, it is characterised in that the layering of described stirrup is laid in radial and axial.
3. one according to claim 1 is based on the reinforced hole of double-layer traffic concrete box beam bridge web, it is characterised in that described stirrup two layers is laid in radial and axial.
4. one according to claim 1 is based on the reinforced hole of double-layer traffic concrete box beam bridge web, it is characterised in that described stirrup three layers is laid in radial and axial.
5. one according to claim 1 is based on the reinforced hole of double-layer traffic concrete box beam bridge web, it is characterised in that described pull bar is radially uniformly laid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2014107993301 | 2014-12-21 | ||
| CN201410799330 | 2014-12-21 |
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| Publication Number | Publication Date |
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| CN105672112A true CN105672112A (en) | 2016-06-15 |
| CN105672112B CN105672112B (en) | 2018-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510967156.1A Active CN105672112B (en) | 2014-12-21 | 2015-12-21 | One kind reinforcing type hole based on double-layer traffic concrete box beam bridge web |
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| CN (1) | CN105672112B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107100319A (en) * | 2017-05-31 | 2017-08-29 | 南宁学院 | A kind of combination beam |
| CN108265616A (en) * | 2018-03-26 | 2018-07-10 | 上海市城市建设设计研究总院（集团）有限公司 | Piping lane builds structure jointly with overhead |
| CN110792026A (en) * | 2019-10-08 | 2020-02-14 | 上海市政工程设计研究总院（集团）有限公司 | Side belly trompil structure of continuous truss bridge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107100319A (en) * | 2017-05-31 | 2017-08-29 | 南宁学院 | A kind of combination beam |
| CN108265616A (en) * | 2018-03-26 | 2018-07-10 | 上海市城市建设设计研究总院（集团）有限公司 | Piping lane builds structure jointly with overhead |
| CN110792026A (en) * | 2019-10-08 | 2020-02-14 | 上海市政工程设计研究总院（集团）有限公司 | Side belly trompil structure of continuous truss bridge |
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| Publication number | Publication date |
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| CN105672112B (en) | 2018-08-28 |
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