Reinforcement Of Reinforced Concrete Support Itabashi, Survey Analysis And Evaluation

Our country in the service plank bridge major part constructionage in the beginning of the 60's to the end of the 90's, the bridgewhich constructs in this period of time is precisely a time which thedesign, the construction and overseeing gradually onsummates. Thesebridges had various prominent problem after the construction and theoperation 10-20 year, the flooring dehiscence, BRIDGE PLATE the crack, Abutment ave vertically and horizontally damaged the settlement, the awl slopecave in, the bridge head jump off seriously and so on, nearly hascovered the bridge structure complete. This certainly also andinitially the design standard was low, nowadays the vehicles overloadoverspeed situation seriously has the very big relations. Thesequestions gradually appear, seriously has affected the vehiclessecurity operation, has the enormous hidden danger. In particularcenter the small bridge is most prominent in the country provincialroad and on the county township road, the majority of bridges are 3kind of bridges, even some 4 kind of bridges. Completely overthrowsregarding these question bridges reconstructs, also not realistic alsois not unnecessary, must demolish the reconstruction immediatelybesides the individual 4 kind of bridges, to the majority of 3 kind ofbridges, may act according to the concrete situation to take thedifferent reinforcement measure, lengthens its life before, rebuildsin the project safeguards safely is unimpeded, is very essential. Statistics have indicated, our country is open to traffic in the roadroad network, up to 2000 year's end, existing bridge 278, 809, amountsto the length is 10.311794 million meters, 98.76% is the permanentbridge, 0.67% is the semi-permanent bridge, 0.57% for temporarybridge. Center, the small span bridge approximately composes thebridge total 94.53%, but their middle majority is located thetechnical standard to be low, on the travelling capability differencecounty township road, the design load standard mostly for the steam-13, tows -60 or the steam -15, hangs -80, also has quite part ofbridges load standards only is the steam-10, the caterpillar band-50, even is lower than the automobile -10 level. As a result of thetransportation enterprise development, the volume of traffic grows dayby day, the vehicles carrying capacity remarkable enhancement, addsartificial or factor the and so on nature influence, has caused thesebridges to be at one kind in spite of one's illness, the excess loadactive status.How makes the appraisal to the bridge actual condition, accurate!yevaluates its bearing capacity, in order to uses the sciencereasonable economy to be suitable the method to carry on thereinforcement,to widen and so on the technological transformations, improves its Fitness, sharpens the road road network travellingcapability, this is our country road the prominent question which mustface in quite long period of time. The practice indicated that, concrete structure any damage and thedestruction, generally all is first appears the crack in the concrete, the crack is reflects the concrete structure plant disease thebarometer. Therefore, to the concrete structure damage diagnosis, first should from to the structure crack investigation, theexamination and the analysis obtains. The reinforced concrete structural cracks origin complex and is many, even many kinds of factors mutual influence, but each crack all has itto have one kind of or several kind of reasons. The reinforcedconcrete bridge Liang crack type, it produces the reason, approximately may induce is two big kinds: First kind: Crack causes which by the outside load, is called theconstitutive crack (to be called stress crack), its crack distributionand the width concern with the outside load. This kind of crackappearance, indicated the structure supporting capacity possibleinsufficiency or has other serious problems. Second kind: Crack causes which by the distortion, is called the non-constitutive crack, like factor and so on temperature change, concreteshrinkage causes when the structure distortion is restricted, canproduce in the structure interior from the stress, when from thestress achieved when concrete tensile strength limit value, can causethe concrete crack. The crack once appears, the distortion obtains therelease, also vanished from the stress. Two kind of cracks have the obvious difference, the harm effect arenot also same. The investigation material indicated that, distorts thecrack in two kind of cracks which causes to occupy the leadership toapproximately compose 80%, to the load causes the crack to occupy theleadership to approximately compose 20%, sometimes two kind of cracksfuse in together. Is the crack hazardous nature evaluates, crackpatching and the reinforcement basis to the crack reason analysis, ifon blindly does not carry on processing to the crack after theanalysis research, not only cannot achieve the anticipated effect, butalso possibly is hiding the burst characteristics accident danger. In view of the Jinan area bridge reinforcement application case, keyfor through for used the carbon fiber and glues the steel platereinforcement to carry on the analysis computation, because Simple lank bridge highly smaller, relative Reinforcement was bigger, uses isreceiving pulls the area directly to additionally build makes up thestrong material, still could not satisfy the design load the request, therefore simultaneously used the union flooring service, took theeffective structure measure, strengthened the flooring level and theLiang board whole connection, guaranteed the flooring level concreteparticipation king post affected together, reduces the reinforcement to make up the strong work load.