Concrete structure reinforcement design.doc

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1、 Concrete structure reinforcement designSheyanbo Wangchenjia Foundation Engineering Co., Ltd. Heilongjiang Dongyu Heilongjiang Province, East Building Foundation Engineering Co., Ltd. CoalAbstract：structure in the long-term natural environment and under the use environments function, its function is

2、 weaken inevitably gradually, our structural engineerings duty not just must finish the building earlier period the project work, but must be able the science appraisal structure damage objective law and the degree, and adopts the effective method guarantee structure the security use, that the struc

3、ture reinforcement will become an important work. What may foresee will be the 21st century, the human building also by the concrete structure, the steel structure, the bricking-up structure and so on primarily, the present stage I will think us in the structure reinforcement this aspect research sh

4、ould also take this as the main breakthrough direction. Key word： Concrete structure reinforcement bricking-up structure reinforcement steel structure reinforcement 1 Concrete structure reinforcement Concrete structures reinforcement divides into the direct reinforcement and reinforces two kinds ind

5、irectly, when the design may act according to the actual condition and the operation requirements choice being suitable method and the necessary technology. the direct reinforcements general method1）Enlarges the section reinforcement law Adds the concretes cast-in-place level in the reinforced concr

6、ete member in bending compression zone, may increase the section effective height, the expansion cross sectional area, thus enhances the component right section anti-curved, the oblique section anti-cuts ability and the section rigidity, plays the reinforcement reinforcement the role.In the suitable

7、 muscle scope, the concretes change curved the component right section supporting capacity increase along with the area of reinforcement and the intensity enhance. In the original component right section ratio of reinforcement not too high situation, increases the main reinforcement area to be possi

8、ble to propose the plateau component right section anti-curved supporting capacity effectively. Is pulled in the section the area to add the cast-in-place concrete jacket to increase the component section, through new Canada partial and original component joint work, but enhances the component suppo

9、rting capacity effectively, improvement normal operational performance. Enlarges the section reinforcement law construction craft simply, compatible, and has the mature design and the construction experience; Is suitable in Liang, the board, the column, the wall and the general structure concretes r

10、einforcement; But scene constructions wet operating time is long, to produces has certain influence with the life, and after reinforcing the building clearance has certain reduction. 2) Replacement concretes reinforcement lawThis laws merit with enlarges the method of sections to be close, and after

11、 reinforcing, does not affect buildings clearance, but similar existence construction wet operating time long shortcoming; Is suitable somewhat low or has concretes carriers and so on serious defect Liang, column in the compression zone concretes intensity reinforcement. 3) the caking outsourcing se

12、ction reinforcement lawOutside the Baotou Steel Factory reinforcement is wraps in the section or the steel plate is reinforced components outside, outside the Baotou Steel Factory reinforces reinforced concrete Liang to use the wet outsourcing law generally, namely uses the epoxy resinification to b

13、e in the milk and so on methods with to reinforce the section the construction commission to cake a whole, after the reinforcement component, because is pulled with the compressed steel cross sectional area large scale enhancement, therefore right section supporting capacity and section rigidity lar

14、ge scale enhancement.This law also said that the wet outside Baotou Steel Factory reinforcement law, the stress is reliable, the construction is simple, the scene work load is small, but is big with the steel quantity, and uses in above not suitably 600C in the non-protections situation the high tem

15、perature place; Is suitable does not allow in the use obviously to increase the original component section size, but requests to sharpen its bearing capacity large scale the concrete structure reinforcement. 4) Sticks the steel reinforcement lawOutside the reinforced concrete member in bending stick

16、s the steel reinforcement is (right section is pulled in the component supporting capacity insufficient sector area, right section compression zone or oblique section) the superficial glue steel plate, like this may enhance is reinforced components supporting capacity, and constructs conveniently. T

17、his law construction is fast, the scene not wet work or only has the plastering and so on few wet works, to produces is small with the life influence, and after reinforcing, is not remarkable to the original structure outward appearance and the original clearance affects, but the reinforcement effec

18、t is decided to a great extent by the gummy craft and the operational level; Is suitable in the withstanding static function, and is in the normal humidity environment to bend or the tension member reinforcement.5) Glue fibre reinforcement plastic reinforcement lawOutside pastes the textile fiber re

19、inforcement is pastes with the cementing material the fibre reinforcement compound materials in is reinforced the component to pull the region, causes it with to reinforce the section joint work, achieves sharpens the component bearing capacity the goal. Besides has glues the steel plate similar mer

20、it, but also has anticorrosive muddy, bears moistly, does not increase the self-weight of structure nearly, durably, the maintenance cost low status merit, but needs special fire protection processing, is suitable in each kind of stress nature concrete structure component and the general constructio

21、n. This laws good and bad points with enlarge the method of sections to be close; Is suitable reinforcement which is insufficient in the concrete structure component oblique section supporting capacity, or must exert the crosswise binding force to the compressional member the situation. 6) Reeling l

22、aw This laws good and bad points with enlarge the method of sections to be close; Is suitable reinforcement which is insufficient in the concrete structure component oblique section supporting capacity, or must exert the crosswise binding force to the compressional member the situation. 7) Fang bolt

23、 anchor law This law is suitable in the concretes intensity rank is the C20C60 concretes load-bearing member transformation, the reinforcement; It is not suitable for already the above structure which and the light quality structure makes decent seriously. The indirect reinforcements general methodP

24、re-stressed reinforcement law(1)Thepre-stressed horizontal tension bar reinforces concretes member in bending,because the pre-stressed and increases the exterior load the combined action, in the tension bar has the axial tension, this strength eccentric transmits on the component through the pole en

25、d anchor (, when tension bar and Liang board bottom surface close fitting, tension bar can look for tune together with component, this fashion has partial pressures to transmit directly for component bottom surface), has the eccentric compression function in the component, this function has overcome

26、 the bending moment which outside the part the load produces, reduced outside the load effect, thus sharpened components anti-curved ability. At the same time, because the tension bar passes to components pressure function, the component crack development can alleviate, the control, the oblique sect

27、ion anti-to cut the supporting capacity also along with it enhancement. As a result of the horizontal lifting stems function, the original components section stress characteristic by received bends turned the eccentric compression, therefore, after the reinforcement, components supporting capacity w

28、as mainly decided in bends under the condition the original components supporting capacity 。(2) After the reinforced concrete component uses under the pre-stressed to support the type tension bar reinforcement decides, forms one by to reinforce the component and under supports the compound ultra sta

29、tically determinate structure system which the type tension bar is composed, under the outside load and the pre-stressed combined action, in the tension bar has the axial force and through (next supports and pole end anchor spot) with components combining site transmits for is reinforced the compone

30、nt, has counter-balanced outside the part the load, changed the original component section endogenic force characteristic, thus sharpened components bearing capacity. This law can reduce is reinforced components stress level, not only causes the reinforcement effect to be good, moreover can also the

31、 great scope enhance the structure overall supporting capacity, but after reinforcing, has certain influence to the original structure outward appearance; Is suitable as well as is under the high stress, the high strained condition concretes components reinforcement in the great span or the heavy st

32、ructure reinforcement, but in the non-protections situation, cannot use in the temperature above 600C in the environment, is also not suitable uses in the concrete shrinkage continuous variation big structure. 2)Increases the supporting reinforcement lawThe addition pivot reinforcement law is throug

33、h the reduced member in bending effective span, achieves the reduced function, in is reinforced on the component to carry the effect, raises the structure load bearing level the goal. This law simple reliable, but easy to harm buildings original condition and the use function, possibly and reduces u

34、ses the space; Is suitable in the concrete term permission concrete structure reinforcement. 1.3Has generally with the concrete structure reinforcement transformation necessary uses technology 1) The request trades the technology It is the joist (either truss) opens the column (or wall), the joist t

35、erminal and the joist trades technologies and so on column to call generally; Belongs to one kind of comprehensive technology, by the related structure reinforcement, the superstructure goes against rises with to reposition as well as abandons technologies and so on component demolition to be compos

36、ed; Is suitable in had buildings reinforcement transformation; Compares with the traditional practices, has the construction time to be short, the expense low, affects and so on merits slightly to the life and the production, but is high to the specification, must complete by the skilled worker, can

37、 ensure the security. 2）Plants the muscle technology It is one item is simple and direct to the concrete structure, the effective connection and the anchor technology; May implant the ordinary steel bar, may also implant the bolt type anchor muscle; Has widely applied in had buildings reinforcement

38、improvement project, for example: In the construction leaks buries the steel bar or the steel bar deviation designs the position the recovery, the component increases the section reinforcement to make up the muscle, the superstructure expands cross, goes against rises to Liang, columns lengthening b

39、y joining, the house superimposed layer terminal and the high-rise construction addition shearing force wall plants the muscle and so on. 3）Crack patching technology According to the concretes cracks cause, the character and the size, use seal differently protect the method to carry on patching, one

40、 kind of skill which causes the structure because to crack reduces the use function which and the durability can restore; Is suitable in had in the building each kind of crack processing, but to the stress crack, besides patching, still should use the corresponding reinforcement measure. The interna

41、l patching law is with the forcing pump the cementing material pressure concretes crack, renders the young or up and coming generation to sew up the function, and makes the original structure through its cementation to restore the integrity, this method is suitable for the crack opening is big, and

42、durable and so on is influential to the structure integrity and the security, or has request and so on waterproof anti-seepage crack patching. 4）Carbonized concretes repair technology It is refers to through restores the concretes the alkalinity (inactivation) or increases its impedance to enable th

43、e steel bar corrosion which the carbonization creates to obtain the containment technology.5）Concretes surface treatment technology It is refers to uses cleaning up concretes surface stains, the oil mark, the residual as well as the other attachment and so on chemistry method, mechanical method, san

44、d blasting method, vacuum cleaning method, injection method skill. 6）Coagulation mantle of soil seal technologyIt is refers to uses flexible methods and so on aquaseal backfill, polymer grouting, paint film to carry on the waterproofing to the concretes, moisture-proof and against crack processing t

45、echnology. Like the structure, the component shift the technology, the adjustment structure base frequency technology and so on. 7）Other technologies Like the structure, the component shift the technology, the adjustment structure base frequency technology and so on. Bricking-up structure Bricking-u

46、p structure reinforcement method: The bricking-up structures reinforcement divides into when the direct reinforcement and reinforces two kinds indirectly, the design, may act according to the actual condition and the operation requirements choice being suitable method. suitable for the bricking-up s

47、tructure direct reinforcement methodoutside reinforced concrete superimposed layer reinforcement lawThis law belongs to the compound section reinforcement method one kind. Its merit is the construction craft simple, compatible, after the bricking-up reinforcement, the supporting capacity has enhance

48、s greatly, and has the mature design and the construction experience; Is suitable in the column, the belt wall wall reinforcement; Its shortcoming is the scene construction wet operating time is long, to produces has certain influence with the life, and after reinforcing the building clearance has c

49、ertain reduction. outside reinforced concrete mortar superimposed layer reinforcement law This law belongs to the compound section reinforcement method one kind. Its merit and outside the reinforced concrete the superimposed layer reinforcement law is close, but enhances the supporting capacity to be inferior to the former; Is suitable in the bricking-up wall reinforcement, sometimes also uses i