CN1837486A - Method for reinforcing integral cast-in-situ concrete beam bridge and slab bridge by prestress - Google Patents
Method for reinforcing integral cast-in-situ concrete beam bridge and slab bridge by prestress Download PDFInfo
- Publication number
- CN1837486A CN1837486A CN 200610020686 CN200610020686A CN1837486A CN 1837486 A CN1837486 A CN 1837486A CN 200610020686 CN200610020686 CN 200610020686 CN 200610020686 A CN200610020686 A CN 200610020686A CN 1837486 A CN1837486 A CN 1837486A
- Authority
- CN
- China
- Prior art keywords
- bridge
- duct
- reinforcing steel
- presstressed reinforcing
- situ concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a integrated irrigated concrete bridge and pre-stress strengthen method, which comprises: a, laying hole channel that drilling couples of hole channels (25, 26) through the plate top (23) and the plate bottom (24) on the beam (20) to be transversely distantly arranged along the beam (20) while the couple one (25, 26) are longitudinally distantly arranged; b, laying pre-stress bar group (1), while each is through relative hole channels (25, 26) as from the bottom (24) via hole channel (25) to the top (23), and from the top (23) via hole channel (26) to the bottom (24); c, drawing each pre-stress bar and anchoring the pre-stress bar with the beam (20) via anchoring elements.
Description
Technical field
The present invention relates to prestress strengthening method, particularly a kind of method by prestressed reinforcement integral cast-in-situ concrete beam bridge, slab bridge.
Background technology
Board-like bridge is big, the wide bridge type commonly used of amount in the highway bridge, and its simple structure, stressed clear and definite can adopt steel concrete and prestressed reinforced concrete construction; Can make solidly and hollow, therefore cast-in-place on the spot curved, slope, the skew bridge for adapting to different shape, in ordinary highway, high-grade highway and the urban road bridge, extensively adopt.Especially building height be restricted with the region of no relief speedway on the middle or small footpath bridge of striding, receive an acclaim especially, thereby can lower the embankment filled soil height, account for less and plough and save volume of earthwork.As time goes on, any highway bridge all will become old bridge, all can need repairing, reinforce and transform because of a variety of causes exists defective, disease to some extent.The prestressed reinforcement method is to adopt to add prestress steel pull bar or shaped steel strut, prestress wire etc. to structural element or whole method of reinforcing, adding part after being characterized in forcing by means such as prestressed stretch-draw and elongation strains---pull bar or strut, prestress wire are stressed, change the original structure distribution of internal force and reduce the original structure stress level, cause in the general ruggedized construction peculiar stiffener ess-strain hysteresis to be eliminated fully, therefore, after add part and original structure co-operation preferably, the overall supporting capacity of structure can significantly improve.The prestressed reinforcement method has triple effects of reinforcing, off-load, change structural internal force, is applicable to the large-span structure reinforcing, and adopts the various structural strengthenings under conventional method reinforcing or the very unfavorable higher stress state of strain of consolidation effect.Based on prestressed superiority and validity, before early, people just begin the external prestressing strengthening bridge.But because the limitation of technology and technological level only limits to tee girder (the rib ellbeam of no base plate) is used this technology.
At present, the prestressed reinforcement concrete beam bridge has three kinds of methods: horizontal prestressing force reinforcement pull bar reinforcing method, strut-framed prestressing force reinforcement pull bar reinforcing method, combination type prestressed reinforcement pull bar reinforcing method.These three kinds of methods all are utilization prestressing force principles, apply certain initial prestressing force in girth member of setting up or former beam body member, structural stress are improved, the reinforcement means that bearing capacity is improved.Wherein, first method can only improve the structure bending resistance, and second kind and the third method can improve bending resistance and shear resistance simultaneously; First method can only be located at the prestressed reinforcement device beam body bottom surface, and second kind and the third method then need presstressed reinforcing steel is upwards bent up along beam rib both sides if will improve shear resistance.When the beam body is cast-in-place whole box-shaped or entity cross section, because the obstruct of base plate, presstressed reinforcing steel can't upwards rise curved, thereby can not solve principal tensile stress and shear strength problem, only is confined to the enhancing of bending resistance.
Summary of the invention
Technical problem to be solved by this invention provides a kind of integral cast-in-situ concrete beam bridge, slab bridge prestress strengthening method, and this reinforcement means can solve beam bridge or positive hogging moment of slab bridge and shearing deficiency well, can satisfy requirement for bearing capacity all sidedly after the reinforcing.
The technical solution adopted for the present invention to solve the technical problems is: integral cast-in-situ concrete beam bridge of the present invention, slab bridge prestress strengthening method, comprise the steps: that a. lays subset of cell channels, many subset of cell channels that the duct is constituted at the bottom of Liang Tishang is drilled with run-through board top, plate, each is horizontally arranged at interval along the beam body to the duct, and two ducts in the every pair of duct are provided with along beam body longitudinal separation; B. lay the presstressed reinforcing steel group, each presstressed reinforcing steel passes pairing duct, promptly pushes up by being upward through duct to plate at the bottom of the plate, is passed down through the duct at the bottom of the plate by plate top again; C. each presstressed reinforcing steel of stretch-draw, and by anchoring piece with each presstressed reinforcing steel and the anchoring of beam body.
The invention has the beneficial effects as follows that because therefore presstressed reinforcing steel can solve concrete beam or positive hogging moment of slab bridge and shearing deficiency well in not enough regional the bending up of shearing, concrete beam and slab bridge can satisfy requirement for bearing capacity all sidedly after this method plate is reinforced; Can avoid and eliminate because of only girt forms huge tensile stress in the concrete behind beam body anchor bad stress state being set at top (end) plate; Constructing operation is convenient, can reduce the reinforcement cost of concrete beam and slab bridge effectively.
Description of drawings
This manual comprises following seven width of cloth accompanying drawings:
Fig. 1 is the laying mode schematic diagram of presstressed reinforcing steel in integral cast-in-situ concrete beam bridge of the present invention, the slab bridge prestress strengthening method;
Fig. 2 is the laying mode schematic diagram of presstressed reinforcing steel in integral cast-in-situ concrete beam bridge of the present invention, the slab bridge prestress strengthening method;
Fig. 3 is the laying mode schematic diagram (overlooking) of presstressed reinforcing steel in integral cast-in-situ concrete beam bridge of the present invention, the slab bridge prestress strengthening method;
Fig. 4 is the local enlarged diagram of node A among Fig. 2;
Fig. 5 is the local enlarged diagram of Node B among Fig. 1;
Fig. 6 is the local enlarged diagram of node C among Fig. 2;
Fig. 7 is the local enlarged diagram of node D among Fig. 2.
Component, position and numbering among the figure: at the bottom of presstressed reinforcing steel group 10, presstressed reinforcing steel 11, presstressed reinforcing steel 12, presstressed reinforcing steel 13, beam body 20, beam body pier position 21, beam body pier position 22, plate top 23, the plate 24, duct 25, duct 26, anchoring piece 30, steering block 31.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
With reference to Fig. 1, integral cast-in-situ concrete beam bridge of the present invention, slab bridge prestress strengthening method comprise the steps:
A. lay subset of cell channels, at the bottom of being drilled with run-through board top 23, plate on the beam body 20 24 by many subset of cell channels that duct 25,26 is constituted, each is horizontally arranged at interval along beam body 20 to duct 25,26, paired duct 25,26 is along the 20 longitudinal separation settings of beam body;
B. lay presstressed reinforcing steel group 10, each presstressed reinforcing steel passes pairing duct 25,26, promptly by 24 being upward through duct 25 to plate top 23 at the bottom of the plate, is passed down through duct 26 at the bottom of the plate 24 by plate top 23 again;
C. each presstressed reinforcing steel of stretch-draw, and by anchoring piece 30 with each presstressed reinforcing steel and 20 anchorings of beam body.
Positive bending moment that is used to reinforce and hogging moment presstressed reinforcing steel can arrange respectively and stretch-draw that presstressed reinforcing steel 11 as shown in Figure 1; Also can arrange continuously, promptly lay a plurality of subset of cell channels in its longitudinal separation of beam body 20 upper edges, presstressed reinforcing steel is along bridge plate 20 longitudinal extensions, presstressed reinforcing steel 12,13 shown in Fig. 1 and Fig. 2 extends to another beam body pier position 22 from beam body pier position 21, make progress continuously, wear downwards and walk around beam body 20 by each subset of cell channels, presstressed reinforcing steel with stretch-draw on 24, anchoring or stretch-draw step by step, anchoring step by step at the bottom of the plate opposite top 23 or the plate by the stretch-draw section.Presstressed reinforcing steel should adopt prestress wire as a rule.
For improving the stress state of anchor point stress, see figures.1.and.2, described duct 25,26 generally should be drilled with the vertical rib place at beam body 20, its drag and anchored force prestressed reinforcement method more before this greatly strengthens, particularly avoid the concentrated tensile stress of anchor point back, can significantly improve the anchor point stress state.With reference to Fig. 1, Fig. 6 and Fig. 7, the axis in described duct 25, the 26 longitudinal axis flare of relative beam body 20 respectively forms 30～60 degree angles, and the preferred value of this angle is 45 degree.Duct, duct 25,26 preferably adopts diamond or alloy steel hollow thin-wall to be drilled to the hole, and the smooth rule of hole wall is not stopped by reinforcing bar, all concrete structure not damageds in hole, and the efficient height, the position standard, quality is good.Hollow thin-wall bores because the pore-creating ability is strong, and all very strong to the beam body practicality of various cross section types, the scope of application is extensive.With reference to Fig. 4, Fig. 5 and Fig. 7, the turning point of described prestress wire, 25,26 port is set with steering block 31 in the duct.
Reinforcement means of the present invention can solve concrete beam or positive hogging moment of slab bridge and shearing deficiency well, and concrete beam and slab bridge can satisfy requirement for bearing capacity all sidedly after this method plate is reinforced.
Grade separation overhead straight-through bridge master bridge in hat and clothes mausoleum, specific embodiment----Chengdu is reinforced.Grade separation overhead straight-through bridge master bridge in hat and clothes mausoleum, Chengdu is a shaped pier box section continuous rigid frame bridge, and access bridge is a freely-supported integral cast-in-situ hollow slab bridge, and its moment of flexure and shearing are all not enough to some extent.Adopt existing external prestressing method, perhaps adopt the method for affixing steel plate, reinforcing bar, all can not really solve its drag problem.The applicant is after bearing this bridge reinforcing design task, analyse in depth and research, formed reinforcement means of the present invention at last, because presstressed reinforcing steel bending up in the not enough zone of shearing, therefore can solve its positive hogging moment and shearing deficiency well, thereby comprehensively satisfy requirement for bearing capacity.Concrete way is, reinforces from the limit rib, adds one group of prestress wire every a rib, and 4 centimetres apart from the soffit of prestress steel twist bobbin thread near the beam-ends place, by 45 degree upwards,, and are anchored in addition in institute's cutter anchor groove to the end end face along the boring duct.Prestress wire adopts high-strength low loose hinge line, and its design strength is 1860MPa, and ground tackle adopts YM15-4 and YM15-3 ground tackle.The stretch-draw of prestressing tendon two ends, the every super earlier 204.5KN that is stretched to of prestress wire, oil return is to controlling anchoring under the pulling force 191.7KN then.Influenced by boring and beam concrete conditions in the establishment of a specific crime, the prestress wire turning radius only is 1 meter.After prestressing force applies and finishes, with spraying concrete to the naked protection of prestressing force steel hinge line bag.At spray concrete place, with cutter hair at the bottom of the beam, and expose distribution bar, spray required steel mesh reinforcement with joint welding, the injection concrete is combined well with former beam body, form an integral body.For guaranteeing drilling quality, the deep hole thin-walled rig boring of adopting the special diamond of Christian Dior Co., Ltd to produce, bit diameter is 51.5 millimeters of φ.
Claims (8)
1, integral cast-in-situ concrete beam bridge, slab bridge prestress strengthening method comprise the steps:
A. lay subset of cell channels, (24) at the bottom of being drilled with run-through board top (23), plate on the beam body (20) by many subset of cell channels that duct (25,26) are constituted, each is horizontally arranged at interval along beam body (20) to duct (25,26), and paired duct (25), (26) are along beam body (20) longitudinal separation setting;
B. lay presstressed reinforcing steel group (10), each presstressed reinforcing steel passes pairing duct (25,26), promptly is upward through duct (25) to plate top (23) by (24) at the bottom of the plate, is passed down through duct (26) (24) at the bottom of the plate by plate top (23) again;
C. each presstressed reinforcing steel of stretch-draw, and by anchoring piece (30) with each presstressed reinforcing steel and beam body (20) anchoring.
2, integral cast-in-situ concrete beam bridge as claimed in claim 1, slab bridge prestress strengthening method is characterized in that: its longitudinal separation of described beam body (20) upper edge is laid with a plurality of subset of cell channels; Described presstressed reinforcing steel makes progress continuously, wears downwards and walk around beam body (20) by each subset of cell channels along bridge plate (20) longitudinal extension.
3, integral cast-in-situ concrete beam bridge as claimed in claim 2, slab bridge prestress strengthening method is characterized in that: described presstressed reinforcing steel is being gone up stretch-draw, anchoring with (24) at the bottom of the plate opposite by stretch-draw section top (23) or the plate.
4, integral cast-in-situ concrete beam bridge as claimed in claim 2, slab bridge prestress strengthening method is characterized in that: the stretch-draw step by step of described presstressed reinforcing steel, anchoring step by step.
5, integral cast-in-situ concrete beam bridge as claimed in claim 1 or 2, slab bridge prestress strengthening method is characterized in that: described duct (25,26) are drilled with the vertical rib place at beam body (20).
6, integral cast-in-situ concrete beam bridge as claimed in claim 1 or 2, slab bridge prestress strengthening method is characterized in that: the axis of described duct (25,26) the longitudinal axis flare of relative beam body (20) respectively forms 30～60 degree angles.
7, integral cast-in-situ concrete beam as claimed in claim 1 or 2, slab bridge bridge prestress strengthening method is characterized in that: the turning point of described presstressed reinforcing steel, the port of (25,26) is set with steering block (31) in the duct.
8, integral cast-in-situ concrete beam bridge as claimed in claim 1 or 2, slab bridge prestress strengthening method is characterized in that: described duct (25) adopt diamond or alloy steel hollow thin-wall to be drilled to the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100206866A CN100455726C (en) | 2006-04-12 | 2006-04-12 | Method for reinforcing integral cast-in-situ concrete beam bridge and slab bridge by prestress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100206866A CN100455726C (en) | 2006-04-12 | 2006-04-12 | Method for reinforcing integral cast-in-situ concrete beam bridge and slab bridge by prestress |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1837486A true CN1837486A (en) | 2006-09-27 |
| CN100455726C CN100455726C (en) | 2009-01-28 |
Family
ID=37014984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100206866A Expired - Fee Related CN100455726C (en) | 2006-04-12 | 2006-04-12 | Method for reinforcing integral cast-in-situ concrete beam bridge and slab bridge by prestress |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100455726C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215824B (en) * | 2008-01-07 | 2010-06-09 | 重庆交通大学 | External transverse tension prestressing device for late-stage deflection control of long-span continuous steel bridges |
| CN105714694A (en) * | 2016-02-03 | 2016-06-29 | 蓝海建设集团有限公司 | Bridge floor maintenance and reinforcing method applicable to expanded type reinforced concrete slab and girder bridge |
| CN112982187A (en) * | 2021-02-10 | 2021-06-18 | 同济大学 | Method for replacing curve prestressed steel beam in damaged bridge body and reinforcing bridge structure |
| CN114922125A (en) * | 2022-05-07 | 2022-08-19 | 山东交通学院 | PC girder bridge, reinforcement device and method of PC girder bridge |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2528432B2 (en) * | 1993-09-14 | 1996-08-28 | オリエンタル建設株式会社 | Reinforcement method for concrete structure using hollow PC steel rod |
| KR100549986B1 (en) * | 2003-06-17 | 2006-02-09 | 노윤근 | Prefabricated reinforcement device for load capacity reinforcement of bridge beam and construction method using the same |
| KR20050010706A (en) * | 2003-07-21 | 2005-01-28 | 신효섭 | External prestressed reinforcing device of a bridge beam for strengthening the beam by external stressing force |
| CN1740445A (en) * | 2005-09-23 | 2006-03-01 | 重庆交通学院 | External pre-stress reinforcing structure for common hollow reinforced concrete slab beam |
-
2006
- 2006-04-12 CN CNB2006100206866A patent/CN100455726C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215824B (en) * | 2008-01-07 | 2010-06-09 | 重庆交通大学 | External transverse tension prestressing device for late-stage deflection control of long-span continuous steel bridges |
| CN105714694A (en) * | 2016-02-03 | 2016-06-29 | 蓝海建设集团有限公司 | Bridge floor maintenance and reinforcing method applicable to expanded type reinforced concrete slab and girder bridge |
| CN112982187A (en) * | 2021-02-10 | 2021-06-18 | 同济大学 | Method for replacing curve prestressed steel beam in damaged bridge body and reinforcing bridge structure |
| CN112982187B (en) * | 2021-02-10 | 2022-06-21 | 同济大学 | Replacing the Curved Prestressed Steel Bundles in the Diseased Bridge and Strengthening the Bridge Structure |
| CN114922125A (en) * | 2022-05-07 | 2022-08-19 | 山东交通学院 | PC girder bridge, reinforcement device and method of PC girder bridge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100455726C (en) | 2009-01-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101994293B (en) | High pier coping construction method | |
| CN208815543U (en) | Side slope surface ruggedized construction | |
| CN206418384U (en) | A kind of few girder composite beam bridge of use Prefabricated composite floorings | |
| CN202047377U (en) | Reinforcing structure of concrete box girder | |
| CN102418386B (en) | Reinforced concrete prefabricated integrally-cast building structure system and construction method thereof | |
| CN100455726C (en) | Method for reinforcing integral cast-in-situ concrete beam bridge and slab bridge by prestress | |
| CN111910660A (en) | Ultrahigh slope supporting structure and construction method thereof | |
| CN102561212A (en) | Method for strengthening vertical crack of single-pillar concrete pier | |
| CN101275385A (en) | Thrust-free tied arch bridge | |
| CN102418425A (en) | Prefabrication integral casting building structure system with cast-in-site haunched beams, and construction method for prefabrication integral casting building structure system | |
| CN106012872A (en) | Non-back cable cable-stayed reinforcement system and construction method of continuous rigid frame bridge | |
| CN105133484B (en) | A kind of part earth anchor higher-lower tower cable-stayed bridge structure | |
| CN203307736U (en) | Reinforced concrete T-shaped beam bridge reinforced structure | |
| CN1405409A (en) | Foundation pit side-wall flexible support method | |
| CN201751461U (en) | Bracket for constructing high pier capping beam | |
| CN102852279A (en) | Prestressed reinforced concrete superposed beam having convex-concave superposed surfaces | |
| CN206941424U (en) | A kind of double width continuous rigid frame bridge tied arch ruggedized construction | |
| CN104532733B (en) | Partial cable-stayed bridge of fish bone beam structure | |
| CN107245959B (en) | A kind of the oblique pull ruggedized construction and its construction method of double width continuous rigid frame bridge | |
| CN2866593Y (en) | Tie-row combination anchor structure of soft row revetment project in estuary | |
| CN111560808A (en) | Deep covering layer landslide section filling roadbed retaining structure and construction method | |
| CN207933881U (en) | Side column freely-supported center pillar consolidates door frame pier structure | |
| CN202829324U (en) | Large tonnage crane beam prestressed precast component | |
| CN206408543U (en) | Suitable for being hinged the T-shaped transversely strengthening system cut section bar | |
| CN215857176U (en) | Cantilever type pier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090128 |