CN104372959A - Structural comprehensive prestress reinforcing method - Google Patents
Structural comprehensive prestress reinforcing method Download PDFInfo
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- CN104372959A CN104372959A CN201410747163.6A CN201410747163A CN104372959A CN 104372959 A CN104372959 A CN 104372959A CN 201410747163 A CN201410747163 A CN 201410747163A CN 104372959 A CN104372959 A CN 104372959A
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Abstract
The invention discloses a structural comprehensive prestress reinforcing method mainly applied to the field of structural reinforcement of civil constructions. After a section to be reinforced is subjected to temporary internal force adjustment, reinforcing is performed by a conventional section enlarging method or by adhering steel plates and carbon fiber cloth, temporary internal force is released after reinforcing, stress distribution of the reinforced combined section is actively adjusted, and a stress difference between new and old materials of the reinforced combined section is reduced. The structural comprehensive prestress reinforcing method is ingenious in design, the features of the prestress theory and the advantages of the traditional section enlarging method are combined, the stress distribution of the combined section is improved as compared to the traditional passive reinforcing method by means of temporary internal force adjustment, the method allows the new or old material to obtain prestress that a designer expects, the new material is tactfully allowed to participate in bearing early constant-load stress of the original structure, the new and old materials coordinate in reasonably bearing stress, and finally better bearing capacity of the reinforced combined section is obtained.
Description
Technical field
The present invention relates to civil engineering technology field of reinforcement, particularly a kind of construction pre-stress comprehensive strengthening method.
Background technology
Prestressing and increasing section reinforcing method are all reinforcement means conventional during civil engineering structure is reinforced.Prestressing carries after reinforcing causes for civil engineering structure band and adds the inadequate natural endowment that supporting material " passive " is stressed, strain (stress) is delayed, change from passive to active, add the high tensile performance of supporting material (high tensile steel wire, steel strand etc.) after having given full play to, effectively improve the utilization ratio of its material; Simultaneously, " initiatively " due to applied stress improves the stress (counteracting the internal force that part external load produces) of reinforced structure, improve the functional performance treating strenthening member, improve the bearing capacity being reinforced component, but the rigidity of the method pair cross-section improves limited, and the method technique is loaded down with trivial details, required anchor device is also more complicated.
Enlargement of Section effectively can improve the ultimate strength and rigidity of waiting to reinforce cross section, but because the method belongs to passive reinforcement method, the passive sticky note of reinforcing layer material (or building or other modes) is on original structure, reinforce well, back-up coat new material is zero stress state, and former (or old) material is owing to assume responsibility for dead load in early stage (or other loads), therefore former (or old) material reinforced good rear existing certain stress level.Thus after causing reinforcing good there is certain stress difference in new and old material, i.e. new material possibility " Stress resort " or " stress is advanced ".Different " strain difference " likely can make always (or new) when material reaches strength limit, and another kind of new (or old) material does not also reach its strength limit far away.Like this, not only uneconomical, and its consolidation effect is limited.
Analyze from above, traditional external prestressing strengthening method and increasing section reinforcing method, one belongs to active reinforcement method, and one belongs to passive reinforcement method, respectively has pluses and minuses.Based on this, needing one badly can either active accommodation compound section stress distribution, reduces new for material stress difference, makes new and old material all can reasonable mechanical, can effectively improve again its normal usage can and ultimate limit state under the comprehensive strengthening method of bearing capacity.
Summary of the invention
The object of the invention is to provide a kind of construction pre-stress comprehensive strengthening method that can be used for civil engineering structure field.
For achieving the above object, the present invention implements according to following technical scheme:
A kind of civil engineering structure prestressing force comprehensive strengthening method, first, before reinforcing, interim hypogene geologic action is carried out to plan ruggedized construction, hypogene geologic action can be one or more in axle power, moment of flexure, shearing, and this hypogene geologic action all can rationally participation structure be stressed and consider based on new and old material after reinforcing, namely this hypogene geologic action is useful to compound section supporting capacity after reinforcing, after interim hypogene geologic action puts in place, more traditionally Enlargement of Section or sticky note steel plate (or carbon fiber) method carry out reinforcing (or construction) new material; Treat that new and old material effectively combines, and after new material meets its respective material requirement of strength, then withdraw from interim hypogene geologic action measure, make it reinforce cross section and return to internal force status before adjustment.So far, this strengthened section is namely completed.
Described hypogene geologic action measure is various, can be carry out in the specific region of structure loading or off-load (according to designer's needs), also can be utilize environment to heat up for statically-indeterminate structure or the measures such as generation second inner force, or other fulcrum forced displacements of lowering the temperature.
Above-mentioned a kind of civil engineering structure prestressing force comprehensive strengthening method, concrete operation is as follows:
1, investigated by structure present situation, condition state, calculation of bearing capacity, before reinforcing, major control section stress is analyzed, and comprehensively determines the hypogene geologic action amount needing to reach;
2, draft rational hypogene geologic action measure, as carried out loading or off-load in specific region according to effect string principle analysis, or Appropriate application circumstance of temperature difference produces the mode such as second inner force and realizes;
3, the preparations such as new and old material effectively combines are ensured by corresponding measure;
4, carry out hypogene geologic action, keep hypogene geologic action measure, and new reinforcement material of constructing;
5, treat newly effectively to combine with regard to material, and newly add the strength of materials reach respective design require after, remove hypogene geologic action measure, complete reinforcing;
Compared with prior art, beneficial effect of the present invention:
The present invention is novel, dexterously the rigidity of original structure, makes original structure have certain temporary distortion by hypogene geologic action, then new reinforced material, from but new or old material obtains the prestressing force that designer wants.Namely tensioning equipment is being eliminated and anchor measure situation has been issued to prestressed reinforcement effect.
Accompanying drawing explanation
Fig. 1 strengthening flow process schematic diagram;
Fig. 2 reinforces each stage stress envelope.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, is used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Fig. 1 and Fig. 2 is described for certain reinforced concrete beam, and as shown in Figures 1 and 2, in Fig. 2,1 is reinforcing starting section, and 2 reinforce cross section for newly-increased, and in Fig. 2, (1) is dead load stress before reinforcing,
c1with
1 s1be respectively the concrete in former cross section and the stress of reinforcing bar before reinforcing; In Fig. 2, in (2), solid line is the stress after interim hypogene geologic action,
c2with
1 s2be respectively the stress of the former cross section concrete after interim hypogene geologic action and reinforcing bar; In Fig. 2, in (3), solid line is the stress after having reinforced,
c3with
1 s3for the stress of the former cross section concrete after having reinforced and reinforcing bar,
2 sfor the stress of newly-increased reinforcing bar.As seen from Figure 2, adopt construction pre-stress reinforcing method, the stress level in former cross section reduces, and newly-increased material take part in stressed in advance, effectively improves the stress performance of compound section after reinforcing.Its reinforcing operation is as follows: (1) is analyzed the technology status of this bridge and dead-load stress, premised on full bridge structure safety, determine hypogene geologic action amount; (2) draft rational hypogene geologic action measure, as carried out loading or off-load in specific region according to effect string principle analysis, or Appropriate application circumstance of temperature difference generation second inner force carries out hypogene geologic action; (3) preparations such as dabbing, bar planting, shuttering are carried out to reinforcing cross section; (4) carry out hypogene geologic action, keep hypogene geologic action measure, and pour into a mould back-up coat concrete; (5), after treating that new fluid concrete reaches design strength, cancel hypogene geologic action measure, complete reinforcing.
Technical scheme of the present invention is not limited to the restriction of above-mentioned specific embodiment, the technology distortion that every technical scheme according to the present invention is made, and all falls within protection scope of the present invention.
Claims (3)
1. a construction pre-stress comprehensive strengthening method, it is characterized in that: reinforce after cross section changes internal force by interim hypogene geologic action measure in plan that traditionally Enlargement of Section or sticky note steel plate or carbon fiber method are reinforced again, effectively to combine and new material reaches the interim hypogene geologic action measure of removal after requirement of strength until the old and new's material, make it reinforce cross section and return to internal force status before adjustment.
2. construction pre-stress comprehensive strengthening method according to claim 1, is characterized in that: the internal force that described needs adjust temporarily is the combination of one or more in axle power, moment of flexure, shearing.
3. construction pre-stress comprehensive strengthening method according to claim 1, is characterized in that: described interim hypogene geologic action measure can be to the loading of structure in specific region or off-load.
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| CN201410747163.6A CN104372959B (en) | 2014-12-10 | 2014-12-10 | A kind of construction pre-stress comprehensive strengthening method |
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| CN201410747163.6A CN104372959B (en) | 2014-12-10 | 2014-12-10 | A kind of construction pre-stress comprehensive strengthening method |
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| CN104372959B CN104372959B (en) | 2016-07-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173125A (en) * | 2019-04-11 | 2019-08-27 | 广东中青建筑科技有限公司 | A kind of method of the external prestressing transplanting anti-bend reinforced beam of steel plate |
| CN112942144A (en) * | 2021-01-27 | 2021-06-11 | 招商局重庆交通科研设计院有限公司 | Reinforced concrete arch bridge reinforcing method based on thermal expansion principle |
| CN114232514A (en) * | 2021-11-25 | 2022-03-25 | 上海同济检测技术有限公司 | Continuous beam bridge active reinforcement method based on influence line principle |
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| JP2000054645A (en) * | 1998-08-04 | 2000-02-22 | Mitsui Constr Co Ltd | Concrete structure reinforcing method |
| CN101772606A (en) * | 2007-06-27 | 2010-07-07 | 莫哈马德·阿尔-艾姆拉尼 | Method |
| CN101994291A (en) * | 2009-08-25 | 2011-03-30 | 徐州工程学院 | Process for applying prestress on steel-concrete combined continuous beam |
| CN102425112A (en) * | 2011-09-30 | 2012-04-25 | 李勇 | Manufacture method for prestress steel-concrete combined bridge |
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| JP2000054645A (en) * | 1998-08-04 | 2000-02-22 | Mitsui Constr Co Ltd | Concrete structure reinforcing method |
| CN101772606A (en) * | 2007-06-27 | 2010-07-07 | 莫哈马德·阿尔-艾姆拉尼 | Method |
| CN101994291A (en) * | 2009-08-25 | 2011-03-30 | 徐州工程学院 | Process for applying prestress on steel-concrete combined continuous beam |
| CN102425112A (en) * | 2011-09-30 | 2012-04-25 | 李勇 | Manufacture method for prestress steel-concrete combined bridge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173125A (en) * | 2019-04-11 | 2019-08-27 | 广东中青建筑科技有限公司 | A kind of method of the external prestressing transplanting anti-bend reinforced beam of steel plate |
| CN110173125B (en) * | 2019-04-11 | 2021-06-08 | 广东中青建筑科技有限公司 | Method for reinforcing beam by bending-resistant steel plate in external prestress transplantation |
| CN112942144A (en) * | 2021-01-27 | 2021-06-11 | 招商局重庆交通科研设计院有限公司 | Reinforced concrete arch bridge reinforcing method based on thermal expansion principle |
| CN114232514A (en) * | 2021-11-25 | 2022-03-25 | 上海同济检测技术有限公司 | Continuous beam bridge active reinforcement method based on influence line principle |
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| CN104372959B (en) | 2016-07-06 |
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