CN103215899B - A kind of reinforcement means of prestressed continuous beam Bottom slab breaking - Google Patents
A kind of reinforcement means of prestressed continuous beam Bottom slab breaking Download PDFInfo
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- CN103215899B CN103215899B CN201310165835.8A CN201310165835A CN103215899B CN 103215899 B CN103215899 B CN 103215899B CN 201310165835 A CN201310165835 A CN 201310165835A CN 103215899 B CN103215899 B CN 103215899B
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Abstract
The present invention relates to a kind of reinforcement means of prestressed continuous beam Bottom slab breaking.Burst apart after pumping of prostressed duct across base plate in continuous beam, cannot by again completing maintenance and reinforcement in the mode of beam body inner stretch-draw prestressing force steel bundle.The present invention cuts the concrete of bottom slab crack; Prefabricating load is executed by two side direction intermediate symmetry even laminating preloadings within the scope of span centre; Newly-increased reinforcing bar is implanted in boring, and resets to former design base top bottom layer of the reinforcing steel mesh sheet, and colligation is fixed, and removes rebar surface laitance; Reach after intensity until concrete and be evenly offloaded to zero by two side direction intermediate symmetry; The elasticity arch of beam body makes base plate supercharging, and top board reduces pressure, and is equivalent to be applied with prestressing force, obtains consolidation effect.The mechanical characteristic that the present invention utilizes continuous beam stressed applies prefabricating load to the paragraph that bursts apart, and for it provides " natural prestressing force ", reduces strengthening construction difficulty and construction cost, can not bring the sequelae that heavily stressed, height is crept.
Description
Technical field
the invention belongs to transport development technical field, be specifically related to a kind of reinforcement means of prestressed continuous beam Bottom slab breaking.
Background technology
After continuous beam prestressed strand pipeline pneumatic mortar, base plate bursts apart, cannot by again completing maintenance and reinforcement in the mode of beam body inner stretch-draw prestressing force steel bundle.Tradition reinforcement means is generally reinforcement, as case beam base plate sticking steel plate, base plate increase external prestressing steel bundle Scheme of Strengthening.
Base plate sticking steel plate scheme will make institute's sticking steel plate play a role, must ensure steel plate and beam body concrete jointly stressed, it is large that difficulty is implemented in compatibility of deformation, and technical difficulty is very large, and the concrete after repairing will bear larger tensile stress under operation load action.Base top sets up external prestressing steel bundle scheme, and baseboard prestress degree can be made to enlarge markedly, and cause Internal Force for Continuous Beam to distribute and larger change occurs, underplate concrete is in high-stress state all the time, and the beam body later stage creeps very large; Local tensile stress before and after anchor block and local compressive stress all comparatively large, structure partial tectonic sieving and difficulty of construction larger.
Summary of the invention
The object of this invention is to provide a kind of reinforcement means of prestressed continuous beam Bottom slab breaking, overcome existing method and only make an issue of in reinforcement, to the technical problem of a lot of counter productives that existing beam body brings.
The technical solution adopted in the present invention is:
A reinforcement means for prestressed continuous beam Bottom slab breaking, is characterized in that:
Realized by following steps:
Step one: the concrete cutting the paragraph case beam bottom slab crack that bursts apart;
Step 2: apply prefabricating load by two side direction intermediate symmetry even laminating preloadings within the scope of beam body span centre, make case back plate pressurized, base plate tension; The downwarp value of Real-Time Monitoring respective cross-section in preloading process, and contrast with calculated value, guarantee existing structure safety;
Step 3: newly-increased reinforcing bar is implanted in boring, and resets to former design base top bottom layer of the reinforcing steel mesh sheet, and colligation is fixed, and removes rebar surface laitance;
Step 4: reach after design strength until concrete and be evenly offloaded to zero by two side direction intermediate symmetry; The elasticity arch of beam body makes base plate supercharging, and top board reduces pressure, and is equivalent to be applied with prestressing force; Survey the arch value in corresponding cross section, and contrast with calculated value, determine consolidation effect.
The present invention has the following advantages:
The reinforcement means of prestressed continuous beam Bottom slab breaking involved in the present invention, adopt the schematic design applying prefabricating load, breach the thinking constraint that traditional Scheme of Strengthening is only being made an issue of by " reinforcement ", the mechanical characteristic utilizing continuous beam stressed applies prefabricating load to beam body, for it provides " natural prestressing force ", be skillfully constructed, reduce strengthening construction difficulty and construction cost, and tradition can not be produced supplement the sequelae that stretch-draw prestressing force scheme heavily stressed, the height that bring creep, be a kind of ideal strengthening construction scheme.
Accompanying drawing explanation
Fig. 1 is beam body longitudinal cracking beam fragment position schematic diagram;
Fig. 2 beam body applies prefabricating load scheme schematic diagram.
Fig. 3 is that beam body applies the horizontal preloading schematic diagram of prefabricating load scheme.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be described in detail.
The reinforcement means of a kind of prestressed continuous beam Bottom slab breaking of the present invention, is realized by following steps:
Step one: the concrete cutting the paragraph case beam bottom slab crack that bursts apart;
Step 2: apply prefabricating load by two side direction intermediate symmetry even laminating preloadings within the scope of beam body span centre, make case back plate pressurized, base plate tension; The downwarp value of Real-Time Monitoring respective cross-section in preloading process, and contrast with calculated value, guarantee existing structure safety; Measured value and theoretical value should be close, in range of allowable error;
Step 3: newly-increased reinforcing bar is implanted in boring, and resets to former design base top bottom layer of the reinforcing steel mesh sheet, and colligation is fixed, and removes rebar surface laitance;
Step 4:: reach after design strength until concrete and be evenly offloaded to zero by two side direction intermediate symmetry; The elasticity arch of beam body makes base plate supercharging, and top board reduces pressure, and is equivalent to be applied with prestressing force.Survey the arch value in corresponding cross section, and contrast with calculated value, determine consolidation effect.Measured value and theoretical value should be close, in range of allowable error.
In step 2, described prefabricating load should with can ensure bridge deck safety, easy construction and can reach reinforce object for principle calculate determine.
Embodiment:
Certain Line for Passenger Transportation prestressed concrete continuous beam there occurs bursting apart of larger area at the bottom of mesopore beam after prestressed stretch-draw, mud jacking.Bridge span arrangement adopts (30.15+48+56+48+30.15) m continuous box girder, the wide 12.0m of case back, bottom width 6.7m, in complete across 56m closure section mud jacking after, No. 4,56m span, No. 5 beam section bottom slab cracks, to come off, and having crack, many places, crack width 1mm ~ 2mm, concrete comes off and locates wide about the 50mm of seam; Bottom slab breaking layering, baseplate reinforcing bar the most about heavy 14.7cm off the net; Under plate top surface topping, come to nothing in many places, and reinforced mesh sinks, and observes in case, and base plate to burst apart layering from longitudinal prestressing bellows.
Comprehensive analysis is burst apart reason, through the com-parison and analysis to traditional Reinforcement Scheme pluses and minuses, consider the distortion of site observation result beam body no exceptions, except base plate, do not find that there is cracking situation at other positions yet, illustrate that beam body integral construction quality is good, bottom slab crack is limited on prestressed impact, and design have employed the scheme applying prefabricating load in span centre beam section.Cut bottom slab crack concrete, beam section place at Bottom slab breaking after steel bundle reorientated by supplementary plain bars applies prefabricating load across preloading, chooses the precompressed scheme of 200-350kN/m, and the reinforcement of final foundation requires that selection is applied with 250kN/m prefabricating load, make case back plate pressurized, base plate tension.Again build cracking section concrete, reach after design strength be evenly offloaded to zero by two side direction intermediate symmetry until concrete, the elasticity arch of beam body makes base plate supercharging, and top board reduces pressure, and is equivalent to be applied with prestressing force.
Reach after design strength until concrete and be evenly offloaded to zero by two side direction intermediate symmetry; Three cross section arch calculated values across Bottom slab breaking in after unloading are 1.33cm, 1.64cm, 1.84cm, and measured value is respectively 1.36cm, 1.65cm, 1.82cm.
Experienced by the test that 900 tons of Bridge Erectors fortune beams pass through in the special simple supported box beam erection process completely of visitor, there is any exception in the Liang Tiwei after reinforcing in the process, consolidation effect is obvious, and result illustrates that this Scheme of Strengthening reaches the design effect of expection.
Content of the present invention is not limited to cited by embodiment, and the conversion of those of ordinary skill in the art by reading manual of the present invention to any equivalence that technical solution of the present invention is taked, is claim of the present invention and contains.
Claims (1)
1. a reinforcement means for prestressed continuous beam Bottom slab breaking, is characterized in that:
Realized by following steps:
Step one: the concrete cutting the paragraph case beam bottom slab crack that bursts apart;
Step 2: within the scope of beam body span centre, adopt from the order in the middle of two side direction and direction, layering preloading symmetrically and evenly applies 250kN/m prefabricating load, makes case back plate pressurized, base plate tension; The downwarp value of Real-Time Monitoring respective cross-section in preloading process, and contrast with calculated value, guarantee existing structure safety;
Step 3: newly-increased reinforcing bar is implanted in boring, and resets to former design base top bottom layer of the reinforcing steel mesh sheet, and colligation is fixed, and removes rebar surface laitance;
Step 4: reach after design strength until concrete, same employing, by the order in the middle of two side direction and direction, is offloaded to zero symmetrically and evenly; The elasticity arch of beam body makes base plate supercharging, and top board reduces pressure, and is equivalent to be applied with prestressing force; Survey the arch value in corresponding cross section, and contrast with calculated value, determine consolidation effect.
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| CN103215899B true CN103215899B (en) | 2015-09-16 |
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| CN105625199B (en) * | 2016-03-18 | 2017-04-12 | 浙江大学城市学院 | Processing method and repairing structure for variable cross-section continuous box beam bottom plate cracking area |
| CN105714698B (en) * | 2016-04-11 | 2017-03-08 | 沈阳建筑大学 | A kind of wide box girder bridge girder Bottom slab breaking ruggedized construction and its construction method |
| CN105735152B (en) * | 2016-04-11 | 2017-04-19 | 沈阳建筑大学 | Girder baseplate crack reinforced structure for variable-section box girder bridge and construction method thereof |
| CN105970838B (en) * | 2016-06-03 | 2018-06-01 | 湖南城市学院 | Deck Arch Bridges vault filler unloads and reinforced construction method and application |
| CN114398775B (en) * | 2022-01-04 | 2022-08-16 | 交通运输部公路科学研究所 | Concrete beam service life prediction method considering cracking damage step stiffness |
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