CN103061271A - Single plate force-bearing reinforcing method of hollow slab bridge - Google Patents
Single plate force-bearing reinforcing method of hollow slab bridge Download PDFInfo
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- CN103061271A CN103061271A CN2012105718584A CN201210571858A CN103061271A CN 103061271 A CN103061271 A CN 103061271A CN 2012105718584 A CN2012105718584 A CN 2012105718584A CN 201210571858 A CN201210571858 A CN 201210571858A CN 103061271 A CN103061271 A CN 103061271A
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Abstract
The invention relates to a single plate force-bearing reinforcing method of a hollow slab bridge. The single plate force-bearing reinforcing method includes that the original bridge deck pavement is shoveled, hinge joint concrete is removed, defects and cracks of the original hollow slab bridge beam body are processed, strip-shaped steel plates are transversely pasted on the upper surface and the lower surface of the hollow slab bridge in the longitudinal bridge direction at certain intervals, split screws penetrate through drilled holes at the hinge joint position, a counter-force frame is arranged, a wedge-shaped block is embedded between the counter-force frame and the steel plates, and the steel plates are pressurized and pasted in sealing mode and then are positioned and fixed; the counter-force frame is demounted after sticky steel glue is cured; cavities in beam joints are subjected to pressure grouting, shear reinforcements are placed into the top surface of a hollow slab, a reinforcement mesh is reconstructed, and the bridge deck reinforcement mesh and the implanted reinforcements are connected in binding or point welding mode to form a whole body; steel fiber reinforced concrete is poured and waterproof coatings are sprayed; and bituminous concrete is paved. The single plate force-bearing reinforcing method improves transverse load distribution, steel plate pasting reliability and bridge integral force-bearing performance on the premise of preventing hollow slab beam body damage, not changing a structural force-bearing system and not interrupting the traffic.
Description
Technical field
The present invention relates to a kind of hollow slab bridge that is applicable to and the stressed reinforcement means of veneer occurred because the hinge seam loses efficacy.
Background technology
Hollow slab bridge is bridge type commonly used in the Bridges in Our Country engineering.This bridge-type structure form is simple, with respect to lower, the prefabricated convenience of tee girder building height, with material economy, be easy to batch production and standardized construction, and veneer is good stability in transportation and hoisting process, thereby in engineering, widelyd popularize, be the form of structure that the medium and small bridge design of China generally adopts.Adopt the type of attachment of shallow hinge between the hollowcore slab of hollow slab bridge, can satisfy transport need in the situation that the traffic volume is little and vehicle capacity is less in the past.But along with the quickening of China's economic construction paces and the increasing of Modern Traffic amount, vehicle has more existing overload, so that hinge seam pass force crossly is excessive, causes the ribbet concrete to be cut and occurs that lateral ties lost efficacy and the veneer stressing conditions between hollowcore slab, jeopardize bridge security, become hidden trouble of traffic.Satisfying in the situation of not interrupting existing traffic, it is an extremely important and necessary job that these spannings are carried out maintenance and reinforcement.
Stitch inefficacy for hollow slab bridge because of hinge and the stressed maintenance punishment of veneer occurs, common method has the affixing steel plate plate reinforcement method at present, the external prestressing strengthening method, and grouting reinforcement method and overlay integrated deck method etc., but all there is defective in various degree in these methods.
1, affixing steel plate plate reinforcement method.If use merely steel bonding glue with steel sticking in concrete surface, the steel plate bonding firmly in a short time, jointly stressed by steel bonding glue and plate-girder, but under the long term of carload, plate-girder generation vertical deflection in steel plate both sides very easily causes the steel plate changing of the relative positions and causes the shear failure of steel plate or anchoring to lose efficacy and came off.If the hinge seam is with percolating water phenomenon, the falling speed of peeling off of steel plate will be faster; In order to strengthen being connected of steel plate and plate-girder, must be in the boring of plate-girder base plate, this again can be to the plate-girder injury, and steel plate both sides anchoring node difficult treatment.So the reliability of steel sticking is that this method faces a maximum difficult problem always.
2, external prestressing strengthening method.Changed the structure stress system, transverse bending moment will increase greatly, might cause new disease; External prestressing anchoring and stretch-draw difficulty are also larger.
3, grouting reinforcement method.Grouting reinforcement method is to utilize press device that cementitious materials is pressed in the distress in concrete, and cementitious materials forms integral body through after condensing, hardening with concrete, thereby reaches the purpose that shutoff is reinforced.This kind method is only applicable to cut with scissors the reinforcing at seam destruction initial stage, has little effect to the stressed bridge of veneer occurring, often only as auxiliary reinforcement measure.
4, overlay the integrated deck method.The method can partly improve the real work performance of hinge seam, improves the load cross direction profiles of plate-girder, but does not fundamentally solve whole stressed problem, and along with the development of Heavy Traffic, deck paving and hinge seam may destroy again.
Summary of the invention
The objective of the invention is for above-mentioned present situation, aim to provide a kind of not change structure stress system, connection is reliable, and uninterrupted traffic is little to original structure destruction, can fundamentally solve the stressed reinforcement means of hollow slab bridge veneer of the stressed problem of hollow slab bridge veneer.
The implementation of the object of the invention is, the stressed reinforcement means of hollow slab bridge veneer, and concrete steps are as follows:
1) roots out original deck paving, remove hinge seam concrete;
2) to former blank board bridge volume defect and crack treatment;
3) affixing steel plate in the vertical bridge distance certain to the interval of hollowcore slab upper surface and soffit edge, is laterally pasted strip steel plate, Screw arbor with nut at both-ends is passed in the boring of hinge seam position, and reaction frame is installed, and embeds wedge between reaction frame and steel plate, the closely connected steel plate that pressurizes, to steel plate position, fixing; After the steel bonding adhesive curing, remove reaction frame;
4) beam seam grouting is carried out slip casing by pressure to the cavity in the beam seam;
5) implant shear reinforcement at the hollowcore slab end face, reset steel mesh reinforcement, the bridge floor steel mesh reinforcement answers colligation or spot welding to be connected with implanting reinforcing bar, to form integral body;
6) cast steel fibrous concrete, the spraying water-repellent paint; Bituminous concrete paves.
The present invention locates, fixes by the steel plate that Screw arbor with nut at both-ends is pasted the upper and lower surface of hollowcore slab, and exerts pressure to improve the reliability of steel sticking, improves the load cross direction profiles; By slip casing by pressure is carried out in the cavity in the beam seam, cap holes improves switching performance between hollowcore slab; By implanting shear reinforcement at the hollowcore slab end face, reset steel mesh reinforcement, cast steel fibrous concrete and bituminous concrete improve the hollowcore slab holistic resistant behavior.
The present invention is avoiding hollow slab beam body destruction, and the change structure stress system under the prerequisite of uninterrupted traffic, has not improved the reliability of steel sticking, has improved the integral bridge stress performance.
Description of drawings
Fig. 1 is the stressed reinforcement means general arrangement of hollow slab bridge veneer elevation,
Fig. 2 is the stressed reinforcement means general arrangement of hollow slab bridge veneer sectional drawing,
Fig. 3 is pasting steel plate construction figure.
The specific embodiment
The present invention locates the steel plate 1,2 that the hollowcore slab upper and lower surface is pasted, fix, and exert pressure to improve the reliability of steel sticking by Screw arbor with nut at both-ends 3, improves the load cross direction profiles; By slip casing by pressure 4 is carried out in the cavity in the beam seam, cap holes improves switching performance between hollowcore slab; By implanting shear reinforcement 5 at the hollowcore slab end face, reset steel mesh reinforcement 6, cast steel fibrous concrete 7 and bituminous concrete 8 improve the hollowcore slab holistic resistant behavior.
1,2 in detail the present invention is described in detail with reference to the accompanying drawings.Concrete steps of the present invention are as follows:
1) root out original deck paving, its construction process is as follows:
1. adopt milling machine to exclude former surface layer bituminous concrete;
2. blinding concrete adopts plant equipment to carry out the shallow-layer fragmentation manually to cut afterwards, cut the protection that should strengthen in the process bridge deck;
3. hinge seam inner concrete thoroughly cuts, and must thoroughly, keep original connecting reinforcement.
2) to former blank board bridge volume defect and crack treatment, its construction process is as follows:
1. utilize pressure-air to blow the floating ash in bridge deck surface, foreign material off;
2. the crack, the defective that bridge deck are existed record, add up, and process on request;
3. as requested affixing steel plate is reached setting-out is carried out in the Screw arbor with nut at both-ends position, Screw arbor with nut at both-ends place hinge seam is holed, and bore diameter should determine according to selected Screw arbor with nut at both-ends specification;
4. basal plane inspection, processing are carried out in steel bonding place, and planeness, moisture content, cleannes need meet design requirement.
3) affixing steel plate, its construction process is as follows:
1. the reply sticking veneer rust cleaning of polishing before the steel sticking, the St3 level, the plate exposure face protects and can fulfil ahead of schedule at the bottom of the beam;
2. paste hollowcore slab upper surface steel plate 1, soffit steel plate 2 by designing requirement, to wearing steel screw rod 3, by exerting pressure steel plate positioned, fix (seeing Fig. 1,2),
3. reaction frame 10 is installed, is embedded wedge 11, the closely connected steel plate (see figure 3) of pressurizeing between reaction frame and steel plate;
4. the steel bonding quality is checked that effectively bond area is not less than 95%;
5. be up to the standards and the steel bonding adhesive curing after, can tighten the Screw arbor with nut at both-ends nut, remove reaction frame; Excision Screw arbor with nut at both-ends end elongated portion.
4) the hollowcore slab end face is implanted shear reinforcement, resets steel mesh reinforcement, and its construction process is as follows:
1. to cavity in the beam seam check, record;
2. the cavity in the beam seam is sealed, and reserved slurry-feeding hole and slurry outlet;
3. the slip casting of beam seam internal pressure 4, and all beam seams are all processed on an equal basis in the spanning scope,
4. bridge deck master muscle and presstressed reinforcing steel are surveyed, and implant reinforcing bar location, unwrapping wire;
5. hole, implant shear reinforcement 5, anchoring adhesive solidifies rear colligation bridge floor steel mesh reinforcement 6;
6. the bridge floor steel mesh reinforcement should with implant reinforcing bar, be connected wearing the screw rod electric welding, to form integral body.
5) cast steel fibrous concrete, the spraying water-repellent paint, bituminous concrete paves; Its construction process is as follows:
1. spray interfacial agents, and all spray interfacial agents in the steel fibrous concrete contact range, comprise inner each face of hinge seam;
2. pour into a mould steel fibrous concrete 7, adopt plate vibrator, walking beam to vibrate; Must not adopt the plug-in type vibrating rod to vibrate;
3. namely begin the maintenance of sprinkling water after the steel fibrous concrete initial set, should constantly keep surface wettability;
4. steel fibrous concrete basic unit checks and accepts, and planeness, water content, roughness, cleannes, intensity etc. must reach the basal plane requirement of spraying waterproofing course;
5. spray water-repellent paint, bituminous concrete 8 paves.
Claims (6)
1. the stressed reinforcement means of hollow slab bridge veneer is characterized in that concrete grammar and step are as follows:
1) roots out original deck paving, remove hinge seam concrete;
2) to former blank board bridge volume defect and crack treatment;
3) affixing steel plate in the vertical bridge distance certain to the interval of hollowcore slab upper surface and soffit edge, is laterally pasted strip steel plate, Screw arbor with nut at both-ends is passed in the boring of hinge seam position, and reaction frame is installed, and embeds wedge between reaction frame and steel plate, the closely connected steel plate that pressurizes, to steel plate position, fixing; After the steel bonding adhesive curing, remove reaction frame;
4) beam seam grouting is carried out slip casing by pressure to the cavity in the beam seam;
5) implant shear reinforcement at the hollowcore slab end face, reset steel mesh reinforcement, the bridge floor steel mesh reinforcement answers colligation or spot welding to be connected with implanting reinforcing bar, to form integral body;
6) cast steel fibrous concrete, the spraying water-repellent paint; Bituminous concrete paves.
2. the stressed reinforcement means of hollow slab bridge veneer according to claim 1, it is as follows to it is characterized in that rooting out original Surfacing Construction flow process:
1. adopt milling machine to exclude former surface layer bituminous concrete;
2. blinding concrete adopts plant equipment to carry out the shallow-layer fragmentation manually to cut afterwards, cut the protection that should strengthen in the process bridge deck;
3. hinge seam inner concrete thoroughly cuts, and keeps original connecting reinforcement.
3. the stressed reinforcement means of hollow slab bridge veneer according to claim 1 is characterized in that former blank board bridge volume defect and crack treatment construction process as follows:
1. utilize pressure-air to blow the floating ash in bridge deck surface, foreign material off;
2. the crack, the defective that bridge deck are existed record, add up, and process on request;
3. as requested affixing steel plate is reached setting-out is carried out in the Screw arbor with nut at both-ends position, Screw arbor with nut at both-ends place hinge seam is holed, and bore diameter should determine according to selected Screw arbor with nut at both-ends specification;
4. basal plane inspection, processing are carried out in steel bonding place, and planeness, moisture content, cleannes need meet design requirement.
4. the stressed reinforcement means of hollow slab bridge veneer according to claim 1 is characterized in that the pasting steel plate construction flow process is as follows:
1. the reply sticking veneer rust cleaning of polishing before the steel sticking, the St3 level, the plate exposure face protects and fulfils ahead of schedule at the bottom of the beam;
2. paste hollowcore slab upper surface steel plate (1), soffit steel plate (2) by designing requirement, to wearing steel screw rod (3), by exerting pressure steel plate positioned, fix,
Reaction frame (10) 3. is installed, is embedded wedge (11) between reaction frame and steel plate, closely connected steel plate pressurizes;
4. the steel bonding quality is checked that effectively bond area is not less than 95%;
5. be up to the standards and the steel bonding adhesive curing after, can tighten the Screw arbor with nut at both-ends nut, remove reaction frame; Excision Screw arbor with nut at both-ends end elongated portion.
5. the stressed reinforcement means of hollow slab bridge veneer according to claim 1 is characterized in that implanting shear reinforcement at the hollowcore slab end face, and it is as follows to reset the steel mesh reinforcement construction process:
1. to cavity in the beam seam check, record;
2. the cavity in the beam seam is sealed, and reserved slurry-feeding hole and slurry outlet;
3. beam seam internal pressure slip casting (4), all beam seams are all processed on an equal basis in the spanning scope,
4. bridge deck master muscle and presstressed reinforcing steel are surveyed, and implant reinforcing bar location, unwrapping wire;
5. hole, implant shear reinforcement (5), anchoring adhesive solidifies rear colligation bridge floor steel mesh reinforcement (6);
6. the bridge floor steel mesh reinforcement should with implant reinforcing bar, be connected wearing the screw rod electric welding, to form integral body.
6. the stressed reinforcement means of hollow slab bridge veneer according to claim 1 is characterized in that pouring into a mould steel fibrous concrete, the spraying water-repellent paint; The asphalt concrete construction flow process that paves is as follows:
1. spray interfacial agents, and all spray interfacial agents in the steel fibrous concrete contact range, comprise inner each face of hinge seam;
2. pour into a mould steel fibrous concrete (7), adopt plate vibrator, walking beam to vibrate;
3. namely begin the maintenance of sprinkling water after the steel fibrous concrete initial set;
4. steel fibrous concrete basic unit checks and accepts,
5. spray water-repellent paint, the bituminous concrete that paves (8).
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| CN104790287A (en) * | 2015-05-08 | 2015-07-22 | 中南林业科技大学 | Small-radius curved rigid frame system bridge |
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| CN103541305B (en) * | 2013-10-15 | 2015-11-18 | 福州大学 | A kind of construction method of the hollow slab bridge structure with integration pave-load layer |
| CN105088973A (en) * | 2015-08-11 | 2015-11-25 | 交通运输部公路科学研究所 | Method for reinforcing hollow slab beam |
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| CN106988203A (en) * | 2017-05-19 | 2017-07-28 | 重庆工商职业学院 | With the concrete hollow slab bridge for laterally strengthening bridge deck pavement |
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Application publication date: 20130424 |