CN206570674U - Assembled pretensioned prestressing corrugated steel web plate composite box girder - Google Patents

Assembled pretensioned prestressing corrugated steel web plate composite box girder Download PDF

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CN206570674U
CN206570674U CN201720222065.XU CN201720222065U CN206570674U CN 206570674 U CN206570674 U CN 206570674U CN 201720222065 U CN201720222065 U CN 201720222065U CN 206570674 U CN206570674 U CN 206570674U
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plate
concrete
precast
longitudinally
prestressed
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李斐然
张士红
袁波
贾亚光
马捷
卢彦
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Henan Provincial Communication Planning and Design Institute Co Ltd
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Henan Provincial Communication Planning and Design Institute Co Ltd
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Abstract

The utility model discloses a kind of assembled pretensioned prestressing corrugated steel web plate composite box girder, including by the longitudinally connected combination beam of multiple precast beam body units, precast beam body unit includes individually prefabricated concrete roof, prestressed concrete bottom plate and Wavelike steel webplate, and precast beam body unit is that concrete roof width is more than the inverted trapezoidal structure that prestressed concrete baseplate width and Wavelike steel webplate are obliquely installed;Concrete roof is built-in with longitudinally connected muscle and prestressed pore passage, and its both sides is longitudinally spaced to offer multiple upper peg notches;Prestressed concrete bottom plate is built-in with longitudinally connected muscle and pretensioning steel beam, and its both sides is longitudinally spaced to offer multiple lower peg notches;Wavelike steel webplate upper and lower ends are welded with the flange plate with peg group.The utility model carries out beam body erection using the assembled structure type of precast block, and the volume and weight of each part are all corresponding smaller, and transport is stable, Hoisting Security, beneficial to construction.

Description

Assembled pretensioned prestressing corrugated steel web plate composite box girder
Technical field
The utility model is related to bridge construction technical field, is first opened more particularly, to a kind of assembled suitable for large bridge Method prestressing force corrugated steel web plate composite box girder.
Background technology
Traditional prefabricated case beam web is generally concrete material, and not only weight is big and easy to crack, therefore concrete box girder is only suitable for Applied to small across footpath(Below 40m)Highway bridge.Pre-Stressed Concrete Composite Box-Girder Bridge with Corrugated Steel Webs is one occurred 1980s Kind of novel bridge structure, its used Wavelike steel webplate has the characteristic of excellent stability and non resistance axial force, makes pre- Stress can be loaded on effectively on concrete roof and prestressed concrete bottom plate;In addition, Pre-Stressed Concrete Composite Box-Girder Bridge with Corrugated Steel Webs Easy construction, can effectively shorten the duration, therefore in big-and-middle-sized bridge(More than 50m across footpaths)In be widely used.
Prestressed concrete composite box-girder with corrugated steel webs is in construction, and general first prefabricated in precasting yard integral structure includes top The i-shaped beamses body unit of plate, bottom plate and Wavelike steel webplate, then at the scene by the horizontal and vertical splicing of above-mentioned concatenation unit progress After complete bridge construction, such as Chinese patent " two times tensioning prestressing force assembled Wavelike steel webplate combination beam and its construction method " (Application number 201510255113.0)The transverse H-shaped prefabricated member of said structure is disclosed, and applies secondary pre- in corresponding opportunity Stress, realizes the laterally assembled of transverse H-shaped prefabricated member.Above-mentioned I-shaped assembled rigid unit self stability is poor, and volume is big, tonnage Weight(Weight of such as single prefabricated I-shaped unit per linear meter(lin.m.) is i.e. up to 5t or so), its cost of transportation and hoisting cost be higher, Hoisting safety is relatively low;Mode is fixedly connected with simultaneously as being used between Wavelike steel webplate and top plate and bottom plate, therefore this is prefabricated Each part in assembled rigid unit can not adjust, not replaceable, add the difficulty of later maintenance.
Chinese patent " pin-connected panel prestressed concrete combined box beam "(Application number 200620126505.3)Disclose one kind The assembled rigid unit of combined box beam, i.e., by the prefabricated concrete roof of reinforcing bar, prestressed, reinforced concrete floor and Wavelike steel webplate point Carried out respectively for three parts integral prefabricated, after lifting is in place, three is vertically spliced at bridge location, is bolted Box girder body unit is formed afterwards.Relative to integral structure, this separated prefabricated box beam top plate, bottom plate and web small volume, It is lightweight, it is readily transported and lifts, it is adaptable to small across footpath, full span erection bridge.For large bridge, such as bridge is a width of 16.75m box girder with corrugated steel webs bridge, the weight of its every linear meter(lin.m.) is up to more than 10t, so even using this structure, it is each pre- Volume, the weight of product are still larger, and transport and lifting advantage be not obvious;Simultaneously as steel web is vertically arranged, with following Shortcoming:I, torsional properties are poor;II, box beams baseplate width and deadweight are larger;III, aesthetic properties are poor;The straight web sunshine areas of IV, Greatly, influenceed greatly by TEMPERATURE FORCE;In addition, the patent does not account for application opportunity and the reserving hole channel of prestressed strand during practice of construction Situations such as, and also not plus discussed for the treatment measures of hogging moment area, lack the measure of reply beam body loaded deformation and specifically apply The detailed consideration of work process aspect, construction feasibility is poor.
The content of the invention
The utility model provides a kind of assembled pretensioned prestressing corrugated steel web plate composite box girder, it is therefore intended that solve existing There are Wavelike steel webplate PC combined box beams easily to occur transporting when being applied to large bridge, lift and later maintenance in terms of ask Topic.
To achieve the above object, the utility model can take following technical proposals:
Assembled pretensioned prestressing corrugated steel web plate composite box girder described in the utility model, including by multiple precast beams The longitudinally connected combination beam of body unit, the precast beam body unit, which includes individually prefabricated concrete roof, prestressing force, to be mixed Solidifying soil bottom plate and Wavelike steel webplate, precast beam body unit be concrete roof width be more than prestressed concrete baseplate width and The inverted trapezoidal structure that Wavelike steel webplate is obliquely installed;The concrete roof is built-in with longitudinally connected muscle and born for wearing pier top The prestressed pore passage of moment of flexure tensioning steel beam, concrete roof both sides are longitudinally spaced to offer multiple upper peg notches;It is described pre- Prestressed concrete bottom plate is built-in with longitudinally connected muscle and pretensioning steel beam, and prestressed concrete bottom plate both sides are along between longitudinal direction Separate provided with multiple lower peg notches;The Wavelike steel webplate upper and lower ends are welded with flange plate, the flange plate and welded There is the peg group being engaged with the upper and lower peg notch.
The angle of inclination of the Wavelike steel webplate is 25 ° -40 °, and now, inverted trapezoidal precast beam body unit structure is most firm.
The assembled pretensioned prestressing corrugated steel web plate composite box girder that the utility model is provided, is mixed using independent prefabricated Solidifying soil top plate, prestressed concrete bottom plate and Wavelike steel webplate, and Wavelike steel webplate inclination is inserted into concrete top at the scene Between plate and prestressed concrete bottom plate, so as to form the prefabricated beam body list of the stronger inverted trapezoidal of aesthetic in appearance, overall anti-twisting property Member, carries out longitudinal spliced pour again afterwards.On the one hand the precast beam body unit structure of above-mentioned inverted trapezoidal takes full advantage of waveform steel " the fold effect " of web realizes that box beam breaks the whole up into parts, and realizes the further piecemeal on vertical, and prefabricated components volume is abundant Reduce, particularly the volume of prestressed concrete bottom plate, weight reduce, more easily transport and lift, be conducive to the fast of bridge Speed is set up, while avoiding the problem of integral prefabricated I-shaped component self stability is poor;On the other hand it make use of waveform steel Web is distinctive weak " beam-ends effect ", is provided with top plate in post-stress steel beam, bottom plate and sets pretensioning Steel beam, the stress for resisting concrete shrinkage and creep generation, with work progress perfect cooperation, reduces live steel Shu Zhangla works Cheng Liang, realizes the maximum convenient of construction.In addition, the Wavelike steel webplate being obliquely installed is small due to sunshine area, be affected by temperature compared with It is small, be conducive to extending bridge life.Above-mentioned web is inserted into top end peg group, in bottom plate peg notch by way of carry out Connection, be connected firmly, construct it is convenient.As can be seen here, advantage of the present utility model can be embodied in it is following some:
(1)The utility model uses the precast assembly unit of inverted trapezoidal, each part, particularly prestressed concrete bottom plate Volume and weight are all corresponding smaller, and stability of the prefabricated component in transportation can not only be effectively ensured, and are easily guaranteed that and hang The security of component during dress, beneficial to construction.
(2)Combined box beam of the present utility model is all using prestressing with bond steel beam, the characteristics of using weak " beam-ends effect ", Most of pretensioned prestressing steel beam, a small amount of top plate pier top hogging moment prestressed strand of tensioning only between the beam body of adjacent across footpath, Live prestressed strand tensioning workload is few, prestress application effect stability.
(3)Concrete component of the present utility model is standard component, can scale carry out prefabricated, live prestressed strand Draw and cast-in-place workload is smaller, be easy to the rapid construction of bridge.
Brief description of the drawings
Fig. 1 is the structural representation of inverted trapezoidal precast beam body unit in the utility model.
Fig. 2 is the structural representation of concrete roof in Fig. 1(Omit longitudinally connected muscle).
Fig. 3 is the structural representation of prestressed concrete bottom plate in Fig. 1(Omit longitudinally connected muscle).
Fig. 4 is the structural representation of Wavelike steel webplate in Fig. 1.
Fig. 5, Fig. 6 are work progress schematic diagrames of the present utility model.
Fig. 7-12 is the relevant drawings that schematic illustration is carried out to the utility model.
Embodiment
Assembled pretensioned prestressing corrugated steel web plate composite box girder described in the utility model, including by multiple precast beams The longitudinally connected combination beam of body unit, the precast beam body unit, which includes individually prefabricated concrete roof 1, prestressing force, to be mixed Solidifying soil bottom plate 2 and Wavelike steel webplate 3, as shown in figure 1, precast beam body unit, which is the width of concrete roof 1, is more than prestressed concrete The inverted trapezoidal structure that the native width of bottom plate 2 and Wavelike steel webplate 3 are obliquely installed;As shown in Fig. 2 concrete roof 1 is built-in with longitudinal direction Dowel and the prestressed pore passage 1.1 for wearing pier top hogging moment tensioning steel beam, the both sides of concrete roof 1 are spaced along the longitudinal Provided with multiple upper peg notches 1.2;In advance should as shown in figure 3, prestressed concrete bottom plate 2 is built-in with longitudinally connected muscle and pretensioning Power steel beam 2.1, the both sides of prestressed concrete bottom plate 2 are longitudinally spaced to offer multiple lower peg notches 2.2;As shown in figure 4, ripple The upper and lower ends of shape steel web 3, which are welded with flange plate 3.1, flange plate 3.1, to be welded with and upper and lower peg notch 1.2,2.2 phases The peg group 3.2 of cooperation.
The angle of inclination of above-mentioned Wavelike steel webplate is 25 ° -40 °, and now, inverted trapezoidal precast beam body unit structure is most firm.
During assembled pretensioned prestressing corrugated steel web plate composite box girder construction described in the utility model, in the steps below Carry out:
The first step, the precast prestressed concrete bottom plate 2 in precasting yard, the precalculated position first on stretching bed seat is fixed Pretensioning steel beam is simultaneously stretched to design load, and then assembling reinforcement net, then installation form, casting concrete treats concrete Reach after design strength, form removal, loosen pretensioning steel beam, complete the pre- of pretensioning prestressed concrete bottom plate 2 System, greatly reduces live steel Shu Zhangla quantities;Meanwhile, precast concrete top plate 1, conventionally assembling reinforcement net, pacifies Prestressed pore passage 1.1 is filled, shaping is then poured;Wavelike steel webplate 3 after the completion of overall processing, two ends welding, afterwards according to Weld corresponding peg group 3.2 in the position of upper and lower peg notch 1.2,2.2.
Second step, as shown in figure 5, setting the conduct of Mobile support device 4 between the adjacent abutment or bridge pier of construction is completed Auxiliary construction platform, while the prestressed concrete bottom plate 2, Wavelike steel webplate 3 and concrete roof 1 of prefabricated completion are transported to Job site.
3rd step, is lifted prestressed concrete bottom plate 2 to Mobile support device 4 using hanging device, by waveform steel Web 3 is hung to the top of prestressed concrete bottom plate 2, and the bottom peg group 3.2 of steel web 3 accurately is inserted into prestressed concrete In the lower peg notch 2.2 of bottom plate 2;Afterwards, concrete roof 1 is hung in recurrence, equally that the top peg group 3.2 of steel web 3 is accurate In the upper peg notch 1.2 for inserting concrete roof 1.
4th step, as shown in fig. 6, Mobile support device 4 is transferred into next spanning position, repeats the 3rd step operation;Tie up Longitudinally connected muscle of the adjacent bridge between top plate, bottom plate is pricked, and casting concrete forms laterally wet seam 5;When concrete reaches During some strength, tensioning be located at adjacent bridge across pier top hogging moment area top plate prestressed pore passage 1.1 in prestressed strand, be used to Resist pier top hogging moment.
5th step, repeats the 4th step operation, forms the beam structure of multispan, after the erection for completing affiliated facility, terminates Construction.
Pretensioned prestressing is used the following is to prestressed concrete bottom plate of the present utility model, and Wavelike steel webplate is inclined The inverted trapezoidal structure combination beam tiltedly set(It is similar to I-shaped Wavelike steel webplate combination beam)Vertically spliced this construction party The concrete principle explanation that feasibility, the reasonability of method are made:
Stress of the precast concrete bottom plate under two states is analyzed first.
1. the 1st state:
Prestressed concrete bottom plate as shown in Figure 7, the prestressing force that the stretch-draw prestressing force steel beam set in it is applied is N, then the section upper stress on prestressed concrete bottom plate be:
2. the 2nd state:
When above-mentioned prestressed concrete floor combination turns into the inverted trapezoidal structure combination beam that Wavelike steel webplate is obliquely installed, Its section structure(Part)As shown in Figure 8.
Apply prestressing force N on prestressed concrete bottom plate, the moment of flexure to compound section neutral axis is:
Obtained by the area moment of upper lower section is equal:
The area of combination beam total cross-section is:
The moment of inertia of whole cross section is:
Wavelike steel webplate combination beam can not consider web due to the non resistance axle power of web when anti-bending bearing capacity is calculated Effect, equivalent to without web plate section, therefore setting:
Then:
The stress of top plate:
Make ratio of height to thickness
The then stress of top plate:
The stress of bottom plate:
Have for general combination beam section, can obtain
By taking the Wavelike steel webplate combination beam of 30m across footpaths as an example.If, now, bring formula into(9)With(10):
When the across footpath of bridge further increases,WithFurther increase, formula(10)Meet
As can be seen here, under the 1st state and the 2nd state, the stress approximately equal of prestressed concrete bottom plate.That is, The prestressing force applied in advance in the prefabricated panel stage, is still held essentially constant after Wavelike steel webplate combination beam is overlapped into.Therefore This mechanical characteristics that Wavelike steel webplate combination beam is taken vertical layered assembled front and rear stress and can be held essentially constant are called overlapping Stress consistency.This characteristic provides the foundation for the vertical layered splicing of Wavelike steel webplate combination beam.
On the basis of above-mentioned analysis, ordinary steel-mixed built H beam and Wavelike steel webplate built H beam are back to discuss Vertical fractionation with it is assembled during stress change.Wherein, it regard prestressing force as only consideration external force:
1. vertical split process:
Fig. 9 is ordinary steel-mixed built H beam(Inverted trapezoidal structure)The schematic diagram vertically split.
Figure 10 is the schematic diagram that the inverted trapezoidal structure combination beam that Wavelike steel webplate is obliquely installed vertically is split.
2. pretensioned prestressing+vertical splicing:
Figure 11 is ordinary steel-mixed built H beam(Inverted trapezoidal structure)When being spliced using pretensioned prestressing and vertically Schematic diagram.
Figure 12 is that the inverted trapezoidal structure combination beam that Wavelike steel webplate is obliquely installed is vertical using pretensioned prestressing and progress Schematic diagram during splicing.
Above-mentioned legend is contrasted to can be seen that for the inverted trapezoidal structure combination beam that Wavelike steel webplate is obliquely installed, It is an independent process that bottom plate, which applies prestressing force to just look like,;But the situation of ordinary steel-mixed combination is entirely different.Cause This, can apply all or part of prestressing force, then by precast concrete bottom plate, waveform steel in precast concrete bottom plate in construction Web and the vertical layered assembly of precast concrete top plate, can so greatly reduce the steel Shu Zhangla workloads at scene, improve factory Prefabricated degree.

Claims (2)

1. a kind of assembled pretensioned prestressing corrugated steel web plate composite box girder, including it is longitudinally connected by multiple precast beam body units Combination beam, the precast beam body unit include individually prefabricated precast concrete top plate, prestressed concrete bottom plate and Wavelike steel webplate, it is characterised in that:Precast beam body unit be concrete roof width be more than prestressed concrete baseplate width and The inverted trapezoidal structure that Wavelike steel webplate is obliquely installed;The concrete roof is built-in with longitudinally connected muscle and born for wearing pier top The prestressed pore passage of moment of flexure tensioning steel beam, concrete roof both sides are longitudinally spaced to offer multiple upper peg notches;It is described pre- Prestressed concrete bottom plate is built-in with longitudinally connected muscle and pretensioning steel beam, and prestressed concrete bottom plate both sides are along between longitudinal direction Separate provided with multiple lower peg notches;The Wavelike steel webplate upper and lower ends are welded with flange plate, the flange plate and welded There is the peg group being engaged with the upper and lower peg notch.
2. assembled pretensioned prestressing corrugated steel web plate composite box girder according to claim 1, it is characterised in that:It is described The angle of inclination of Wavelike steel webplate is 25 ° -40 °.
CN201720222065.XU 2017-03-09 2017-03-09 Assembled pretensioned prestressing corrugated steel web plate composite box girder Active CN206570674U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111893884A (en) * 2020-07-06 2020-11-06 湖北工业大学 Asynchronous construction method for full-prefabricated assembled construction corrugated steel web bridge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111893884A (en) * 2020-07-06 2020-11-06 湖北工业大学 Asynchronous construction method for full-prefabricated assembled construction corrugated steel web bridge

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