CN101769042B - matched prefabricated concrete hollow slab beam structure - Google Patents
matched prefabricated concrete hollow slab beam structure Download PDFInfo
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- CN101769042B CN101769042B CN2009102645753A CN200910264575A CN101769042B CN 101769042 B CN101769042 B CN 101769042B CN 2009102645753 A CN2009102645753 A CN 2009102645753A CN 200910264575 A CN200910264575 A CN 200910264575A CN 101769042 B CN101769042 B CN 101769042B
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- slab
- hollow slab
- prefabricated concrete
- concrete hollow
- girder
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- 239000004567 concrete Substances 0.000 title claims abstract description 45
- 210000003205 Muscles Anatomy 0.000 claims description 24
- 239000011159 matrix materials Substances 0.000 claims description 9
- 230000003014 reinforcing Effects 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 239000011513 prestressed concrete Substances 0.000 abstract description 3
- 210000001503 Joints Anatomy 0.000 abstract 4
- 201000010099 diseases Diseases 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 230000035882 stress Effects 0.000 description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reactions Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 238000004458 analytical methods Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000010410 layers Substances 0.000 description 2
- 230000001681 protective Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000036698 Distribution coefficient Effects 0.000 description 1
- 241001499740 Plantago alpina Species 0.000 description 1
- 210000002435 Tendons Anatomy 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000023298 conjugation with cellular fusion Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000003379 elimination reactions Methods 0.000 description 1
- 238000005516 engineering processes Methods 0.000 description 1
- 239000004744 fabrics Substances 0.000 description 1
- 230000002349 favourable Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 methods Methods 0.000 description 1
- 238000004452 microanalysis Methods 0.000 description 1
- 230000002085 persistent Effects 0.000 description 1
- 230000003449 preventive Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 230000036633 rest Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000021037 unidirectional conjugation Effects 0.000 description 1
Abstract
Description
Technical field
The present invention relates to a kind of matched prefabricated concrete hollow slab beam structure, belong to civil engineering bridge superstructure field.
Background technology
At present, three kinds of disease forms mainly appear in prefabricated concrete hollow slab girder bridge superstructure: base plate transverse crack, base plate longitudinal crack and hinge seam, and wherein, the base plate transverse crack generally can solve through reasonable Arrangement longitudinal prestressing muscle; And for base plate longitudinal crack and hinge seam disease, its profound failure mechanism is not clear, and prophylactico-therapeutic measures also never has substantial breakthrough.
The base plate longitudinal crack generally occurs along the direction of presstressed reinforcing steel or common steel bar stress, and in a single day occurs, and its length major part is all greater than 1/3l, and l is the span of beam.Present research shows that the appearance of base plate longitudinal crack mainly contains the following several kinds of origin causes of formation: presstressed reinforcing steel is put poisson effect and radial load effect, a prestressed hollow slab beam base plate too early, presstressed reinforcing steel and is crossed thin and prefabricated concrete hollow slab girder internal-external temperature difference.In addition, the origin cause of formation of base plate longitudinal crack all rests on the qualitative analysis level, and deep micro-analysis still remains to be studied, and does not also propose the prophylactico-therapeutic measures of effective base plate longitudinal crack simultaneously.
Hinge seam disease is the persistent ailment of prefabricated concrete hollow slab girder always.As far back as the sixties in 20th century, the bridge superstructure that adopts polylith precast prestressed concrete hollow slab beam to be assembled is owing to three-dimensional effect occurs; Connection between the prefabricated concrete hollow slab girder; Normally " hinge method " according to Soviet Union bridge scholar crow Ritz base carries out the transverse distribution coefficient calculations, therefore, and in the design in early stage; Prefabricated concrete hollow slab girder adopts the design of little hinge seam; This little hinge seam connected mode Transfer of Shear is not transmitted other internal force, in addition; Mainly there is following problem in this little hinge seam: the integral rigidity of the unreasonable little hinge seam of (1) structure is compared with the integral rigidity of hollowcore slab and is differed greatly, and can't bear distortion and force request under load acts on repeatedly; (2) construction space of the little hinge of constructional difficulties seam is very limited, has increased the difficulty of construction, has guaranteed not the concrete density of hinge seam, and hair is handled if the sidewall of hollow slab beam is not made cutter, and arrangement of reinforcement not, and it is thing sooner or later that then little hinge seam takes place to destroy.The design of little hinge seam is popular nearly 30 years; Abandoned gradually after the nineties; Substituted by big hinge seam; The design reinforcement of big hinge seam also emerges various ways, improves the arrangement of reinforcement of hollow slab beam bottom flange on the one hand, also adopts steel plate or ∏ shape cloth muscle to strengthen to hinge seam compression flange on the other hand.Big hinge sewer has that globality is better, torsional rigidity reaches advantages such as transverse integral property is good greatly; Do not cut with scissors the elimination of stitching disease but the appearance of big hinge seam also means that, the infiltration of hinge seam, albefaction reach owing to the hinge seam destroys the veneer that causes and receive still ubiquity in the hollowcore slab beam bridge of force phenomenon.Research shows, by the wet hinge seam that connects prefabricated concrete hollow slab girder is connected into whole bridge, under the carload effect; The tensile stress that its direction across bridge produces reaches 1.16MPa; This stress amplitude often acts on hinge seam place, and hinge seam place generally is a New-old concrete joint surface, and adhesion stress is comparatively weak; Under course under cyclic loading, easy to crack; In addition, though the top flange pressurized of hinge seam, deck paving is prone to produce disease such as gather around bag, peel off; And in a single day deck paving destroys, and the bridge floor rainwater will get into the layer of mating formation easily, acts on repeatedly down in freeze thawing circulation and carload; Also be prone to produce destroy, this also is the Another reason that the hinge seam destroys.
Visible from above-mentioned analysis, present research does not also propose the effectively preventing measure to base plate longitudinal crack and these two kinds of diseases of hinge seam, and traditional prefabricated concrete hollow slab girder can't address these problems.Therefore, study a kind of new prefabricated concrete hollow slab girder structure, and then these diseases are proposed comprehensive preventive health measures is present task of top priority.
Summary of the invention
The present invention is directed to the deficiency of prior art, a kind of new prefabricated concrete hollow slab girder structure is provided,, solved the effective measures of not preventing and treating base plate longitudinal crack disease at present so that the base plate longitudinal crack is prevented and treated.
For realizing above technical purpose, the present invention will take following technical scheme:
A kind of matched prefabricated concrete hollow slab beam structure comprises and encloses top board, web and the base plate that is connected into slab and girder, establishes hollow cavity in the said slab and girder, and top board, web and base plate adopt concrete pouring to form, and the web external surface is arranged shear connector.
Further, slab and girder is provided with longitudinal prestressing muscle and transverse prestress muscle.
Further, transverse prestress muscle and longitudinal prestressing muscle are staggeredly located.
Further, the longitudinal prestressing muscle forms through the body internal beam that vertically is embedded in the slab and girder, and then the top board weft element external beam and the base plate weft element external beam on two surfaces form the transverse prestress muscle up and down through being horizontally set at hollow cavity.
Further, the body internal beam is installed in the matrix of location, and this location matrix vertically is arranged in the slab and girder, and said location matrix comprises vertical body internal beam anchor plate and is arranged at the body internal beam ground tackle on this vertical body internal beam anchor plate.
Further, offer a plurality of through holes on the base plate.
Further, the diameter of the through hole of offering is Φ 50mm～Φ 150mm on the said base plate.
Further, the spacing between the adjacent two through hole is 1m～2m.
Further, the top board external surface is offered grooving.
Further, the pre-buried reinforcing bar of establishing in the top board.
According to above technical scheme, can realize following beneficial effect:
1. hollow slab beam structure of the present invention is arranged shear connector at the web external surface through the mode of Matching Precast; Then bridge superstructure can be realized being connected of hollow slab beam structure through shear connector, therefore, adopts shear connector to replace the design of hinge seam; Avoided in hinge seam narrow space, carrying out arrangement of reinforcement; Concrete is difficult to the shortcoming of vibration compacting, has also overcome in the design of traditional hinge seam, and the rigidity of hinge seam and the rigidity of prefabricated concrete hollow slab girder are compared less contradiction;
2. the prestressing force of transverse prestress muscle generation has been offset under the carload effect; The direction across bridge tensile stress that in whole bridge base plate, produces; Strengthened the mass action of bridge; This has guaranteed that not only there is compressive stress in two adjacent prefabricated concrete hollow slab girder matched interface places, but also has guaranteed that also there is prestressing force in the base plate direction across bridge of prefabricated concrete hollow slab girder, has prevented the appearance of prefabricated concrete hollow slab girder longitudinal crack effectively;
3. on base plate, offer through hole, guaranteed flowing of the inside and outside temperature difference of prefabricated concrete hollow slab girder unlikely excessive and air, avoided the thermal stresses to cause that longitudinal crack appears in the beam body;
4. offer grooving at the top board external surface, increased the bonding between deck paving and the deck, guarantee the cementation of deck paving and prefabricated concrete hollow slab girder top board, prevented and treated the immersion of rainwater, avoided the first road protective barrier of hinge seam to lose efficacy.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Wherein, through hole 1 shear connector 2 body internal beam anchor plates 3 body internal beam ground tackles 4 top boards 5 webs 6 base plates 7 vertical body internal beam 8 base plate weft element external beams 9 top board weft element external beams 10 reinforcing bars 11 groovings 12.
The specific embodiment
Accompanying drawing discloses the structural representation of the specific embodiment that the present invention relates to without limitation, below will combine accompanying drawing that technical scheme of the present invention at length is described.
Matched prefabricated concrete hollow slab beam structure of the present invention comprises and encloses top board 5, web 6 and the base plate 7 that is connected into slab and girder, establishes hollow cavity in the said slab and girder; And top board 5, web 6 and base plate 7 adopt concrete pouring to form; And web 6 external surfaces are arranged shear connector 2 through the mode of Matching Precast, and therefore, the present invention adopts shear connector 2 to replace the design of tradition hinge seam; Promptly in the prefabricated process of prefabricated concrete hollow slab girder according to the invention; The hollow slab beam structure that has watered is as the side form of next root precast hollow slab and girder, and constantly circulation is until watering complete one hollow slab beam structure of striding; Simultaneously; Between two adjacent hollow slab beam structures, cancel original big hinge seam design, adopt shear connector 2 forms to replace; Avoided in hinge seam narrow space, carrying out arrangement of reinforcement; Concrete is difficult to the shortcoming of vibration compacting, has also overcome in the design of traditional hinge seam, and the rigidity of hinge seam and the rigidity of prefabricated concrete hollow slab girder are compared less contradiction.
Analysis shows; The hollow slab beam structure that the multi-disc that is arranged side by side is watered is under highway one-level load action; Adjacent two hollow slab beam structure junctions; Bigger tensile stress can occur at direction across bridge, therefore, the prestressed concrete plate beam that adopts shear connector 2 to connect also will inevitably open under load action.Like this, will cut down the mass action of prefabricated concrete hollow slab girder greatly, " veneer is stressed " phenomenon will occur once more.In light of this situation; The prefabricated prefabricated concrete hollow slab girder of matching method adopts the two dimension prestressing design; Be that said slab and girder is provided with longitudinal prestressing muscle and transverse prestress muscle; And this longitudinal prestressing muscle forms through the vertical body internal beam 8 that vertically is embedded in the slab and girder, and then the top board weft element external beam 10 and the base plate weft element external beam 9 on two surfaces form the transverse prestress muscle up and down through being horizontally set at hollow cavity; Transverse prestress muscle and longitudinal prestressing muscle are staggeredly located simultaneously.Do not increasing base plate 7 thickness, fully guaranteeing under the situation of longitudinal prestressing muscle position, this has increased difficulty for the layout of transverse prestress muscle.Therefore, the transverse prestress muscle adopts external unbonded tendon, and base plate weft element external beam 9 is close to the upper surface of base plate 7, passes the reserving hole channel of web 6 and base plate 7 intersections, is anchored in the side bar side.
In addition, vertically body internal beam 8 is installed in the matrix of location, and this location matrix vertically is arranged in the slab and girder, and said location matrix comprises vertical body internal beam anchor plate 3 and is arranged at the body internal beam ground tackle 4 on this vertical body internal beam anchor plate 3.
Have, research shows that prefabricated concrete hollow slab girder structure internal-external temperature difference is to cause base plate 7, web 6 to produce the major reason of longitudinal crack again.And in the temperature gradient effect with meet with suddenly under two kinds of operating modes of cold wave, the stress least favorable on web 6 and base plate 7 surfaces.Therefore; In order to guarantee flowing of the temperature difference inside and outside the prefabricated concrete hollow slab girder unlikely excessive and air; On the base plate 7 of prefabricated concrete hollow slab girder structure, offer a plurality of through holes 1; And the diameter of the through hole of offering 1 is Φ 50mm～Φ 150mm, and the spacing between the adjacent two through hole 1 is 1～2m simultaneously.
It is that deck paving destroys earlier that there is a major reason of hinge seam disease in the prefabricated concrete hollow slab girder structure.Deck paving is the first road protective barrier of hinge seam, is bearing the effect of vehicular load jointly with the beam body.When deck paving occur gathering around bag, the heap move and peel off after; Deck paving is shared vehicular load effect forfeiture; Rainwater can penetrate into the tack coat of deck paving and hollow slab beam structure along rent, and then penetrates in the hinge seam, causes hinge seam disease; Bonding between deck paving and the hollow slab beam structure layer is a New-old concrete joint surface in addition; Therefore, the present invention buries reinforcing bar 11 in advance underground in top board 5, offers grooving 12 at top board 5 external surfaces simultaneously and can strengthen the bond effect between deck paving and the hollow slab beam structure.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102645753A CN101769042B (en) | 2009-12-28 | 2009-12-28 | matched prefabricated concrete hollow slab beam structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102645753A CN101769042B (en) | 2009-12-28 | 2009-12-28 | matched prefabricated concrete hollow slab beam structure |
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| Publication Number | Publication Date |
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| CN101769042A CN101769042A (en) | 2010-07-07 |
| CN101769042B true CN101769042B (en) | 2012-02-08 |
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| CN2009102645753A CN101769042B (en) | 2009-12-28 | 2009-12-28 | matched prefabricated concrete hollow slab beam structure |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935983B (en) * | 2010-08-27 | 2012-02-22 | 郑州大学 | Construction method for assembling integral hollow slab bridge |
| CN102337723B (en) * | 2011-08-05 | 2014-10-29 | 中国神华能源股份有限公司 | Bridge |
| CN102359057B (en) * | 2011-08-05 | 2014-10-29 | 中国神华能源股份有限公司 | Bridge |
| CN102587267A (en) * | 2012-04-06 | 2012-07-18 | 浙江大学 | Tension-fabricated bridge with prestressed hollow-plate-girders and middle transverse partitions and construction method of tension-fabricated bridge with prestressed hollow-plate-girder and middle transverse partitions |
| CN103835228B (en) * | 2014-02-28 | 2016-08-17 | 华南理工大学 | A kind of prefabricated subsection formula concrete-bridge seam construction and docking calculation thereof |
| CN104612329A (en) * | 2015-01-30 | 2015-05-13 | 柳忠东 | Prefabricated truss beam |
| CN104878837B (en) * | 2015-01-30 | 2018-09-18 | 青岛九屋建筑安装有限公司 | A kind of concrete frame structure system and its assembly method |
| CN105484142B (en) * | 2015-10-30 | 2017-07-11 | 河海大学 | A kind of pin-connected panel precast segment concrete hollow slab beam structure and preparation method thereof |
| CN105729616B (en) * | 2016-04-23 | 2017-12-15 | 华北理工大学 | Assorted fibre substitutes the self-compacting concrete pre-cast hollow slab and preparation method of reinforcing bar |
| CN107288024B (en) * | 2017-07-25 | 2020-01-31 | 武汉理工大学 | Assembled beam body and construction method thereof |
| CN108532438B (en) * | 2018-03-30 | 2019-07-23 | 中交路桥北方工程有限公司 | A kind of small curved bridge box beam of karst region high-pier large-span |
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2009
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| CN101769042A (en) | 2010-07-07 |
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Granted publication date: 20120208 Termination date: 20131228 |