CN103422616A - Continuous box girder adopting corrugated steel web steel and concrete composite structure - Google Patents
Continuous box girder adopting corrugated steel web steel and concrete composite structure Download PDFInfo
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- CN103422616A CN103422616A CN2013103083209A CN201310308320A CN103422616A CN 103422616 A CN103422616 A CN 103422616A CN 2013103083209 A CN2013103083209 A CN 2013103083209A CN 201310308320 A CN201310308320 A CN 201310308320A CN 103422616 A CN103422616 A CN 103422616A
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Abstract
The invention relates to a box girder, particularly to a continuous box girder adopting a corrugated steel web steel and concrete composite structure, which includes two or more corrugated steel webs, a top steel plate, a bottom steel plate, concrete and a connecting end, wherein the corrugated steel webs are arranged between the top steel plate and the bottom steel plate; the top steel plate, the bottom steel plate and the corrugated steel webs are all connected through welding; the single girder body structure forms a continuous girder structure through the connecting end; the top steel plate or the bottom steel plate is combined with concrete to form a concrete composite structure. The corrugated steel webs in the continuous box girder realize the smooth transition of a straight line section and an arc section through three transitional sections at corners, solve the problem of stress concentration at corners; besides, a pressure-bearing part adopts a steel and concrete composite structure with micro strain waves, so that the problem of stress concentration in the composite structure is solved, and excellent structural performance and economy can be obtained.
Description
Technical field
The present invention relates to the case beam, related in particular to a kind of Wavelike steel webplate steel-concrete combined structure continuous box girder.
Background technology
At present, traditional case beam or steel case beam are according to the requirement of shearing resistance flexing, and the ratio of height to thickness of web is generally in the 100:1 left and right, and trapezoidal waveform steel web is due to extremely strong shearing resistance and anti-flexural property, and its ratio of height to thickness is 300:1 greatly.The Wavelike steel webplate adopted in existing Wavelike steel webplate case beam, the waveform of its web all is comprised of straightway and arc section, easily produces stress in the coupling part of straightway and arc section and concentrates.Tradition i beam or steel case beam compression flange also adopt steel plate, at pressure zone, adopt steel work can not embody the economy of steel work, as adopt steel-concrete combined structure, the most compressive stress of pressure zone is born by concrete, although can embody economy, but concrete shrinkage and creep characteristic makes itself and the steel work can not cooperative bearing, causes the stresses re-distribution phenomenon.
Summary of the invention
The present invention is directed in prior art the shearing resistance of common case beam and anti-flexural property poor, and the corrugated sheet steel of Wavelike steel webplate case beam easily produces stress and concentrates, cause the application life of case beam short, pressure-bearing adopts the pure steel structure member, the shortcomings such as cost performance is low, especially in combining structure, concrete shrinkage and creep characteristic makes itself and the steel work can not cooperative bearing, causes the stresses re-distribution phenomenon.Provide a kind of by the end socket end plate is set, improve the cross section rigidity of beam body and the intensity of link, the waveform of web passes through straightway, changeover portion, arc section three parts form, wherein changeover portion can effectively connect straightway and arc section, the concentrated problem of stress when the solution straightway directly is connected with arc section, the plug-in type bearing structure of pressure zone can not only make stable connection, and possesses shrink space when variations in temperature, in the time of the tensile region stable connection, the Wavelike steel webplate steel-concrete combined structure continuous box girder that heat expansion phenomenon in the time of can resisting the variation of beam temperature is set of its cavity.Especially adopted the pressure-bearing frange plate with miniature strain wave, on the pressure-bearing frange plate, the Wavelike steel webplate steel-concrete combined structure freely-supported i beam of concreting, solved the stresses re-distribution phenomenon that concrete shrinkage and creep causes.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
Wavelike steel webplate steel-concrete combined structure continuous box girder, comprise two and above Wavelike steel webplate, the top steel plate, the bottom steel plate, concrete, link, described Wavelike steel webplate is arranged between top steel plate and bottom steel plate, top steel plate and Wavelike steel webplate are by being welded to connect, Wavelike steel webplate and bottom steel plate are by being welded to connect, the top steel plate, the bottom steel surface roughness is 70-350 μ m, between single girder construction by one or more be connected in link or steel strand cable, form beam structure, top steel plate or bottom steel plate and Combined concrete form concrete combined structure.
As preferably, described Wavelike steel webplate is the continuous ladder twists and turns steel plate with changeover portion and circular arc-shaped corner, and changeover portion is between straightway and circular arc-shaped corner, and the circular arc-shaped corner radius is r, and the radius of changeover portion is R, and R is the gradual change radius, and R is ∞-r.
As preferably, described Wavelike steel webplate is L along the point of contact wire length of wave height direction
AB, along the point of contact wire length of wavelength direction, be L
BC, L
AB>=L
BC.
As preferably, described top steel plate is with the miniature strain wave of evagination crest.Traditional corrugated sheet steel is vertically substantially without rigidity, with the frange plate of miniature strain wave, rigidity vertically arranged, can pressure-bearing, and the longitudinal rigidity of its miniature strain wave part weakens part and obtains reinforcement because of the cross section of concrete evagination.
As preferably, doubly, the wave crest length of evagination part is less than 300mm to the 3-20 that the wave height of described miniature strain wave is top steel plate steel plate thickness, and the distance between crest and crest is for being greater than 1000mm.The wave height of miniature strain wave adopts 3-20 times of top steel plate thickness, the anti-pressure ability weakened because of the existence of miniature strain wave in the time of making top steel plate pressurized, the 3-20 increased by the evagination times of concrete section that the top steel plate thickness increases makes up, make the top steel plate can accept the longitudinal contraction of concrete and creep, with the concrete cooperative bearing, again longitudinal contraction with creep in process and process after keep overall construction intensity.
Because concreting on pressure-bearing frange plate or top end steel plate, concrete exists short-term to shrink and long term creep strain, above-mentioned variation all makes concrete the contraction state of total amount one thousandth left and right occur, and can not work in coordination with contraction with the straight frange plate of the tradition of Combined concrete, thereby cause the actual forced status of combining structure and desirable stress to have notable difference, the frange plate that can not work in coordination with contraction takes the lead in having born compressive stress, causes stresses re-distribution phenomenon in combining structure.This patent adopts the way that miniature strain wave is set on steel plate at the bottom of straight frange plate or top, make its longitudinal contraction that can accept concrete and creep, keep structural strength after reaching process again in longitudinal contraction and the process of creeping, solved the above-mentioned bottleneck problem of combining structure at one stroke.
As preferably, described link comprises that an end of beam body is provided with plug, and the other end is provided with jack, between adjacent simple supported box beam, by plug and jack, is connected.The plug-in type bearing structure of pressure zone can not only make stable connection, and possesses shrink space when variations in temperature.
The link pressure zone is plug in construction, and tensile region is the connected device with cavity.
As preferably, link one end that described plug in construction is the case beam is provided with plug, and the other end is provided with jack, between adjacent simple supported box beam, by plug and jack, is connected.
As preferably, described plug is provided with barb, and jack is concave.
As preferably, described plug is cylinder, and jack is to coordinate hollow cannula with plug.
As preferably, described link is for being welded to connect.
As preferably, being welded to connect of described link adopts first freely-supported, rear continuous connected mode.Continuous connected mode after first freely-supported, be on the one hand because of workshop manufacture, the effects limit such as transportation, lifting length, on the other hand, this method be conducive to each across between camber is set or applies prestressing force.
As preferably, the thickness of described top steel plate is greater than or less than the thickness of bottom steel plate.Because pressure zone need be considered flexing, flexing need not be considered in tensile region, so traditional tensile region is identical with the steel using amount of pressure zone or section area, make the tensile region part have the function phenomenon of having more than needed, it is science and uneconomic not, the pressure zone steel using amount suitably increases, and is conducive to the pressurized of member, the function of tension part is given full play to, and reaches higher cost performance.
As preferably, described top steel plate, bottom steel plate are arch along the Wavelike steel webplate wavelength direction.Above-mentioned upper arch structure, be conducive to member stress, offsets the downwarp of carrying situation lower member.
The present invention is owing to having adopted above technical scheme, have significant technique effect: the waveform of web of the present invention passes through straightway, changeover portion, arc section three parts form, wherein changeover portion can effectively connect straightway and circular arc-shaped corner, the concentrated problem of stress when the solution straightway directly is connected with arc section, the plug-in type bearing structure of pressure zone can not only make stable connection, and possesses shrink space when variations in temperature, in the time of the tensile region stable connection, heat expansion phenomenon when the arranging of its cavity can be resisted the beam temperature and changed, adopt steel-concrete combined structure, concrete is as compression-member, cost performance is high.Especially the pressure-bearing position adopts the steel concrete combining structure with miniature strain wave, has solved the problem of the stresses re-distribution in the combining structure, makes combining structure Steel concrete cooperative bearing, has good structural performance and economy.
The accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the middle waveform steel web structure schematic diagram of Fig. 1.
Fig. 3 is the I section enlarged drawing of Fig. 2.
Fig. 4 is the left view of Fig. 1.
Fig. 5 is the connection diagram between adjacent simply supported beam.
Fig. 6 is II section enlarged drawing in Fig. 5.
Fig. 7 is III section enlarged drawing in Fig. 5.
Fig. 8 is the structural representation with miniature strain wave.
Fig. 9 is the front view of Fig. 8.
The toponym that in above accompanying drawing, each number designation refers to is as follows: wherein 1-top steel plate, 2-Wavelike steel webplate, 3-bottom steel plate, 5-steel strand cable, 7-concrete, the miniature strain wave of 11-, 21-circular arc-shaped corner, 22-changeover portion, 23-straightway, 24-plug, 25-jack.
The specific embodiment
Below in conjunction with accompanying drawing 1 to Fig. 9 and embodiment, the present invention is described in further detail:
Wavelike steel webplate steel-concrete combined structure continuous box girder, as shown in Figures 1 to 9, comprise two and above Wavelike steel webplate 2, top steel plate 1, bottom steel plate 3, concrete seven, link, it is characterized in that: described Wavelike steel webplate 2 is arranged between top steel plate 1 and bottom steel plate 3, top steel plate 1 and Wavelike steel webplate 2 are by being welded to connect, Wavelike steel webplate 2 and bottom steel plate 3 are by being welded to connect, the top steel plate, the bottom steel surface roughness is 70-350 μ m, between single girder construction by one or more be connected in link or steel strand cable 5, form beam structure, top steel plate 1 or bottom steel plate 3 are combined to form concrete combined structure with concrete seven.When simple supported box beam is common beam, top steel plate 1 mainly bears pressure, and now top steel plate 1 is combined to form concrete combined structure with concrete seven; When simple supported box beam is semi girder, bottom steel plate 3 mainly bears pressure, and now bottom steel plate 3 is combined to form concrete combined structure with concrete seven.Adopt concrete combined structure as pressure-bearing structure member, there is cost low, the advantage that cost performance is high.Top steel plate, bottom steel surface roughness are 280 μ m.Increase top steel plate 1, bottom steel plate 3 surface roughnesses, high roughness can obviously increase the adhesive power of coating.
Wavelike steel webplate is the continuous ladder twists and turns steel plate with changeover portion and circular arc-shaped corner, and changeover portion is between straightway and circular arc-shaped corner, and the circular arc-shaped corner radius is r, and the radius of changeover portion is R, and R is the gradual change radius, and R is ∞-r.Changeover portion 22 end that is connected with straightway 23, radius is that R is that trend is infinitely great; Changeover portion 22 end that is connected with circular arc-shaped corner 21, radius is that R is that trend equals r, therefore, by straightway 23 to circular arc-shaped corner 21, the radius R of changeover portion 22 equals r for being decreased to gradually from infinity, thereby makes straightway 23 and circular arc-shaped corner 21 smooth transition more, reduces stress and concentrates.The waveform of web forms by straightway, changeover portion, arc section three parts, wherein changeover portion can effectively connect straightway and circular arc-shaped corner, when the solution straightway directly is connected with arc section, the concentrated problem of stress, be suitable for the industrial mass manufacture, and mould and manufacturing cost are lower.
Wavelike steel webplate is L along the point of contact wire length of wave height direction
AB, along the point of contact wire length of wavelength direction, be L
BC, L
AB>=L
BC.Wavelike steel webplate 2 equals or is slightly larger than the point of contact wire length along wavelength direction, i.e. L along the point of contact wire length of wave height direction
AB>=L
BCDesign make the shear strength of corrugated sheet steel and steel using amount reach good cost performance, if wavelength direction is long, i.e. L
BC>=L
ABShear behavior obviously reduces, and wavelength direction is too short, and steel using amount obviously increases.Therefore, adopt L
AB>=L
BCDesign, can either, guaranteeing shear strength, can reduce rolled steel dosage again as far as possible.
Common top steel plate adopts the straight flat frange plate steel plate that rigidity is vertically arranged, and when concrete shrinks when creeping, steel plate vertically can shrink hardly and creep.Like this, just can cause concrete shrinking when creeping, the shelling phenomenon occurs in straight frange plate and concrete, and particularly serious is the stresses re-distribution problem that causes that steel work takes the lead in stressed, affect the stability of structure, makes the structural strength reduction.
Link comprises that an end of beam body is provided with plug 24, and the other end is provided with jack 25, between the adjacent tank beam, by plug 24 and jack 25, is connected.The link pressure zone is plug in construction, and tensile region is the connected device with cavity.With the connected device of cavity, for as shown in Figure 7, plug 24 is provided with barb, and jack 25 is concave.
Link one end that plug in construction is the case beam is provided with plug 24, and the other end is provided with jack 25, between adjacent simple supported box beam, by plug 24 and jack 25, is connected.The plug-in type bearing structure of pressure zone can not only make stable connection, and possesses shrink space when variations in temperature.In the time of the tensile region stable connection, heat expansion phenomenon when the arranging of its cavity can be resisted the beam temperature and changed.
The thickness of top steel plate 1 is greater than or less than the thickness of bottom steel plate 3.Because pressure zone need be considered flexing, flexing need not be considered in tensile region, so traditional tensile region is identical with the steel using amount of pressure zone or section area, make the tensile region part have the function phenomenon of having more than needed, it is science and uneconomic not, the pressure zone steel using amount suitably increases, and is conducive to the pressurized of member, the function of tension part is given full play to, and reaches higher cost performance.When the thickness of top steel plate 1 is greater than the thickness of bottom steel plate 3, it is common case beam, and top steel plate 1 bears pressure.
As shown in Fig. 1 to Fig. 5,7,8,9, the difference of the present embodiment and embodiment 1 is: connect by steel strand cable 5 between single girder construction, form beam structure.The link pressure zone is plug in construction, and link one end that plug in construction is the case beam is provided with plug 24, and the other end is provided with jack 25, between adjacent simple supported box beam, by plug 24 and jack 25, is connected.By plug 24, with jack 25, coordinate, the plug-in type bearing structure of pressure zone can not only make stable connection, and possesses shrink space when variations in temperature.In the time of the tensile region stable connection, heat expansion phenomenon when the arranging of its cavity can be resisted the beam temperature and changed.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (10)
1. Wavelike steel webplate steel-concrete combined structure continuous box girder, comprise two and above Wavelike steel webplate (2), top steel plate (1), bottom steel plate (3), concrete (7), link, it is characterized in that: described Wavelike steel webplate (2) is arranged between top steel plate (1) and bottom steel plate (3), top steel plate (1) and Wavelike steel webplate (2) are by being welded to connect, Wavelike steel webplate (2) and bottom steel plate (3) are by being welded to connect, top steel plate (1), bottom steel plate (3) surface roughness is 70-350 μ m, between single girder construction by one or more be connected in link or steel strand cable (5), form beam structure, top steel plate (1) or bottom steel plate (3) are combined to form concrete combined structure with concrete (7).
2. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 1, it is characterized in that: described Wavelike steel webplate (2) is the continuous ladder twists and turns steel plate of band changeover portion (22) and circular arc-shaped corner (21), changeover portion (22) is positioned between straightway (23) and circular arc-shaped corner (21), circular arc-shaped corner (21) radius is r, the radius of changeover portion (22) is R, R is the gradual change radius, and R is ∞-r.
3. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 1, it is characterized in that: described Wavelike steel webplate (2) is L along the point of contact wire length of wave height direction
AB, along the point of contact wire length of wavelength direction, be L
BC, L
AB>=L
BC.
4. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 1, it is characterized in that: described top steel plate (1) is with the miniature strain wave (11) of evagination crest.
5. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 4, it is characterized in that: the 3-20 that the wave height of described miniature strain wave (11) is top steel plate (1) steel plate thickness doubly, the wave crest length of evagination part is less than 300mm, and the distance between crest and crest is for being greater than 1000mm.
6. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 1, it is characterized in that: described link comprises that an end of beam body is provided with plug (24), the other end is provided with jack (25), between the adjacent tank beam, by plug (24) and jack (25), is connected.
7. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 1 is characterized in that: described link adopts and is welded to connect.
8. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 7, is characterized in that: the described first freely-supported of employing, the rear continuous connected mode of being welded to connect.
9. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 1, is characterized in that: the thickness of steel plate (3) bottom the thickness of described top steel plate (1) is greater than or less than.
10. Wavelike steel webplate steel-concrete combined structure continuous box girder according to claim 1, it is characterized in that: described top steel plate (1), bottom steel plate (3) are arch along Wavelike steel webplate (2) wavelength direction.
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Cited By (4)
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| WO2017210950A1 (en) * | 2016-06-08 | 2017-12-14 | 卢国林 | Novel bridge structure utilizing connected-plate truss |
| CN107687227A (en) * | 2017-09-30 | 2018-02-13 | 东南大学 | A kind of corrugated sheet steel concrete combination beam |
| CN108465715A (en) * | 2018-04-17 | 2018-08-31 | 上海振华重工(集团)股份有限公司 | Automatic straightening method after a kind of plate unit welding of optimization |
| CN111663711A (en) * | 2020-05-20 | 2020-09-15 | 江苏科技大学 | Steel-concrete composite beam and preparation method thereof |
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Effective date of registration: 20150228 Address after: 314422, No. 168-2, village, town, Hangzhou, Xiaoshan District, Zhejiang Applicant after: Zhejiang CTB Corrugated Steel Web Co., Ltd. Address before: 311200 Nanyang Economic Development Zone, Xiaoshan District, Zhejiang, Hangzhou Applicant before: Hangzhou Li Yang Steel Structure Co., Ltd. |
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