CN101769042B - matched prefabricated concrete hollow slab beam structure - Google Patents

matched prefabricated concrete hollow slab beam structure Download PDF

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Publication number
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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China
Prior art keywords
slab
hollow slab
prefabricated concrete
concrete hollow
girder
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CN2009102645753A
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Chinese (zh)
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CN101769042A (en
Inventor
袁爱民
朱晓文
吉伯海
蔡军军
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河海大学
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Publication of CN101769042A publication Critical patent/CN101769042A/en
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Abstract

The invention discloses a matched prefabricated concrete hollow slab beam structure, which comprises a top slab, webs and a bottom slab which form the slab beam structure in an enclosing way. A hollow chamber is arranged in the slab beam structure. The top slab, the webs and the bottom slabs are poured by concrete. Shear keys are distributed on the surface of the webs in a matched prefabricating way. Thereby, the shear keys are used to substitute for hinge joints, the defect that concrete is difficult to be vibrated tightly when reinforcement is conducted in the narrow space of the hinge joints is avoided, the contradiction that the rigidity of the hinge joints is lower than the rigidity of the prestressed concrete hollow slab beam in the traditional hinge joint design is overcome, the prestress on the constructional longitudinal bridge and the constructional transverse bridge of the hollow slab beam, the cracks on the bottom slab and the damages of the hinge joints are prevented and controlled, and the current problem that the longitudinal cracks of the bottom slab cannot be prevented and controlled is solved.

Description

Matched prefabricated concrete hollow slab beam structure

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)

1. matched prefabricated concrete hollow slab beam structure; Comprise and enclose top board, web and the base plate that is connected into slab and girder, establish hollow cavity in the said slab and girder, and top board, web and base plate adopt concrete pouring to form; It is characterized in that the web external surface is arranged shear connector; Slab and girder is provided with longitudinal prestressing muscle and transverse prestress muscle, and transverse prestress muscle and longitudinal prestressing muscle are staggeredly located; Offer a plurality of through holes on the base plate; The top board external surface is offered grooving.
2. matched prefabricated concrete hollow slab beam structure according to claim 1; It is characterized in that; 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.
3. matched prefabricated concrete hollow slab beam structure according to claim 2; It is characterized in that; The body internal beam is installed in the matrix of location; 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.
4. matched prefabricated concrete hollow slab beam structure according to claim 1 is characterized in that, the diameter range of the through hole of offering is Φ 50mm~Φ 150mm on the said base plate.
5. matched prefabricated concrete hollow slab beam structure according to claim 4 is characterized in that, the spacing between the adjacent two through hole is 1m~2m.
6. matched prefabricated concrete hollow slab beam structure according to claim 1 is characterized in that, the pre-buried reinforcing bar of establishing in the top board.
CN2009102645753A 2009-12-28 2009-12-28 matched prefabricated concrete hollow slab beam structure CN101769042B (en)

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Application Number Priority Date Filing Date Title
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CN101769042B true CN101769042B (en) 2012-02-08

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Families Citing this family (11)

* Cited by examiner, † Cited by third party
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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