CN109468943A - The anti-ejection system of vertical prestressed reinforcement and its construction method with function of seismic resistance - Google Patents
The anti-ejection system of vertical prestressed reinforcement and its construction method with function of seismic resistance Download PDFInfo
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- CN109468943A CN109468943A CN201811206733.5A CN201811206733A CN109468943A CN 109468943 A CN109468943 A CN 109468943A CN 201811206733 A CN201811206733 A CN 201811206733A CN 109468943 A CN109468943 A CN 109468943A
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of anti-ejection system of the vertical prestressed reinforcement with function of seismic resistance, the anti-ejection system of vertical prestressed reinforcement from top to bottom successively includes bridge floor functional rehabilitation system, cementing buffer system, impact force decentralized system, antidetonation anchor system.The invention also discloses a kind of construction methods of anti-ejection system of the vertical prestressed reinforcement with function of seismic resistance.Processing, the weldering of reinforcing bar in length and breadth and implantation reinforcing bar of the invention are followed closely with critical processes such as hammer strap welding, the aperture of steel plate and hot galvanizings in factory's completion, greatly improve integral construction quality, it is ensured that system reliability；The present invention can construct when being partially open to traffic, field operation is simple, work efficiency is high, all vertical prestressed reinforcements can be all covered, hidden danger is not stayed, lifetime of system is theoretically identical as bridge life, greatly improve the safety of such bridge, the development of Technology Bridge Strengthening is pushed, reliable, safe and environment-friendly and low cost has good society and economic benefit.
Description
Technical field
It is pre- for Long span that the present invention relates to the anti-ejection system of vertical prestressed reinforcement and construction methods, in particular to one kind
The anti-ejection system and construction method of prestressed concrete beam bridge vertical prestressed reinforcement, the system have function of seismic resistance.
Background technique
As shown in Figure 1, vertical prestressed reinforcement 8 is arranged usually to improve the abdomen of box beam in Long span prestressed concrete beam bridge
The bearing capacity and crack resistance of plate, the vertical prestressed reinforcement of Earlier designs generally use larger diameter high-intensity fine rolling screw-thread steel
Anchorage 3, upper anchor plate 6, lower anchor plate 11, lower nut 1 are provided on muscle, including vertical prestressed reinforcement 8, it is shown vertical pre-
Stress reinforcing bar 8 is located in the hole in box girder cantilever board concrete 7, box girder web concrete 10, box beam underplate concrete 13
In road, grouting material 9 is provided in the gap between the duct and vertical prestressed reinforcement 8.Above-mentioned setting is commonly present following
Problem:
1, high-strength finish rolling deformed bar be easy to produce in process of production abnormal martensitic structure, surface defect or crackle,
The problems such as slag inclusion and component segregation, acts in tension stress, is easy to cause reinforcing bar delayed fracture.
2, high-strength finish rolling deformed bar is rigid rod, to construction and installation bolt-nut, high-strength finish rolling deformed bar,
The requirement of anchor plate three's installation accuracy is quite high, otherwise easily causes high-strength finish rolling deformed bar eccentric tension, local stress mistake
Greatly.
3, vertical prestressed reinforcement generally uses two times tensioning, but high-strength finish rolling deformed bar length is short, elongation compared with
It is few, if misoperation, ultra stretching is easily caused, causes stress excessive.
4, vertical prestressing bar is generally easy the presence of squeezing quality, mainly has leakage mud jacking, mud jacking not full or mud jacking
Expect intensity deficiency etc..
Since the above various factors often has and vertically answers in advance between part Long span prestressed concrete beam bridge runs more than ten years
The fracture of power reinforcing bar or slip and pop up, expose bridge floor 0.2m ~ 8m and differ, vertical prestressed reinforcement pop-up moment, which has, powerful rushes
Power is hit, untouched anchor concrete 2, former bridge floor bituminous concrete 1 are broken through generation bituminous concrete block 4, concrete block 5, with vertical
Deformed bar pops up together, and harmfulness is very big；
There are serious traffic safety hidden danger, be easy to cause major motor vehicle safety accident and larger casualties, also reduce bridge
Web part shear-carrying capacity and crack resistance are the key technical problems for needing urgently to solve.
Summary of the invention
In view of the above technical problems, an object of the present invention is to provide a kind of vertical prestressing steel with function of seismic resistance
The anti-ejection system of muscle, the ejection system are extensive by antidetonation anchor system, impact force decentralized system, cementing buffer system and bridge floor function
Complex system collectively constitutes.By only near the vertical prestressed reinforcement in smaller range, bituminous concrete is changed to have it is anti-
The anti-ejection system of vertical prestressed reinforcement for shaking function achievees the purpose that prevent vertical prestressed reinforcement from popping up, avoid by pre-
Major traffic accidents caused by stress reinforcing bar pops up, also ensure the shear-carrying capacity and crack resistance of web；Due to local construction,
The construction that is open to traffic can be maintained, the construction operation time is short, can restore original asphalt concrete bridge surface ride comfort sexual function, the system
There is relatively strong antiseismic grade dynamic load functions ability, there is good society and economic benefit.
Above-mentioned purpose of the invention is achieved by the following technical solution:
A kind of anti-ejection system of vertical prestressed reinforcement with function of seismic resistance, the anti-ejection system of vertical prestressed reinforcement by
Under successively include bridge floor functional rehabilitation system, cementing buffer system, impact force decentralized system, antidetonation anchor system,
The bridge floor functional rehabilitation system from top to bottom successively includes thin-layer bituminous concrete and waterproof layer, the waterproof layer master
It wants function to prevent steam from penetrating into cementing buffer system, protects the steel of antidetonation anchor system and impact force decentralized system not by corruption
Erosion, the thin-layer bituminous concrete will restore have skid resistance using laminate structure with original deck paving consistency function
Energy is good, abrasion resisting, open to traffic is early, reduces the excellent performances such as road traveling noise.
The antidetonation anchor system includes implantation dowel of the top with crotch, gluing base expanding and base expanding anchor bolt, direct impact resisting steel
Plate, steel bonding glue, WELDING STUDS, the gluing base expanding and base expanding anchor bolt are fixed in box beam concrete, and the direct hammer strap passes through glue
Viscous base expanding and base expanding anchor bolt and steel bonding glue are fixed on box beam concrete upper surface and cover vertical prestressed reinforcement upper end, the WELDING STUDS
It is weldingly fixed on the direct hammer strap upper surface vertically；
The impact force decentralized system includes several longitudinal reinforcement and transverse steel being uniformly arranged, the crotch of the implantation dowel
Place is fixedly connected with the intersection of the longitudinal reinforcement and transverse steel；
The cementing buffer system includes pouring the steel fiber reinforced concrete being arranged on the impact force decentralized system, is used for antidetonation
The anchor system and impact force decentralized system is cementing is integrated, which has stronger bending resistance drawing, shock resistance
And anti-fatigue performance, can effectively disperses impact forces, inhibit the extension of inside concrete microcrack and the formation of macrocrack.
Further, the implantation dowel is in the quincuncial arrangement of plane in length and breadth, and spacing 30x30cm, one end adopts
It is anchored in concrete with anchoring adhesive, anchorage depth is greater than 10 times of bar diameters, and other end is equipped with 180 ° of elbows, catches on described
On the outside of the transverse steel of impact force decentralized system.
Further, the expansion anchor section length of the gluing base expanding and base expanding anchor bolt bottom is at least 1/5 anchor bolt length, expanded- angle
At least 20 degree, anchor pole and nut hot galvanized layer thickness are at least 100 um, each gluing base expanding and base expanding anchor bolt plane spacing in length and breadth
40x40cm arrangement, is evenly arranged around vertical prestressed reinforcement periphery, and one end is anchored in concrete using anchoring adhesive, anchor
Gu depth is greater than times anchor bolt diameter, other end screw cap anchoring is at direct hammer strap edge.Subdrilling cut-off hole when construction, so
Reaming tool is reused afterwards and is pre-formed reaming in the bottom of anchor hole, is injected the anchoring adhesive of 1/3 hole depth amount, is inserted into gluing base expanding and base expanding anchor
Bolt expands the expanding mechanism of anchor bolt in the reaming of bottom, fills up bottom and expanded by way of tapping anchor bolt casing
The space opened, forms antiseismic mechanical self-latching anchoring function.
Further, the thickness of the direct hammer strap is greater than 12mm, by pressure injection steel bonding glue mixed
Solidifying soil top surface, non-adhesive surface carry out hot galvanizing, and galvanized layer thickness is at least 100um.
Further, the steel bonding glue with a thickness of 2-4mm makes the direct hammer strap pair using A grades of glue of I class
Concrete is just drawing adhesion strength to be at least 2.5 MPa and is being concrete cohesional failure.
Further, the WELDING STUDS is by the spacing plane of 20x20cm in length and breadth around the vertical prestressed reinforcement week
Side welding is arranged in the direct impact resisting steel plate top surface, and each WELDING STUDS gos deep into and stretches out the outermost of the impact force decentralized system
Layer reinforcing bar at least 1cm guarantees that direct hammer strap participates in cementing buffer system and impact force decentralized system forms entirety, jointly
Resist instantaneous impact.
Further, the transverse steel is located above longitudinal reinforcement, and interplanar spacing 10-12cm, diameter is at least
For 16mm, net protective layer thickness is at least 3cm, and the diameter of the longitudinal reinforcement is at least 12mm, interplanar spacing 10-12cm.
Further, the cementing buffer system thickness is at least 8 cm, the thin-layer bituminous concrete with a thickness of 2
~4 cm。
The second object of the present invention is to provide a kind of applying for anti-ejection system of the vertical prestressed reinforcement with function of seismic resistance
Work method, the construction method main technique are milling vertical prestressed reinforcement top surface asphalt concrete pavement nearby, are implanted into anchor bolt
Dowel installs antidetonation anchor system, installs impact force decentralized system, pours cementing buffer system, pave bridge floor functional rehabilitation system
System.
This purpose of the invention is achieved by the following technical solution:
A kind of construction method of the anti-ejection system of vertical prestressed reinforcement with function of seismic resistance as mentioned, comprising steps of
Step 1: progress local traffic, which is enclosed, covers, and along direction across bridge, in vertical prestressed reinforcement two sides, at least 1m range milling is vertically answered in advance
The former bridge floor bituminous concrete of power reinforcing bar top surface, wherein the position for pasting direct hammer strap is cleared up, chipping it is suitable,
Expose hard concrete plane, other indirect impact resisting steel Board position dabbings obtain concave-convex rough surface, complete base treatment；
Step 2: direct hammer strap being opened into grout hole and anchor hole, welds WELDING STUDS, non-adhesive surface hot galvanizing；First drill through
Then straight hole reuses reaming tool in the bottom of anchor hole and is pre-formed reaming, injects the anchoring adhesive of at least 1/3 hole depth amount, peace
The gluing base expanding and base expanding anchor bolt and direct hammer strap are filled, anchor bolt, edge sealing, pressure injecting glue are tightened；It will the processing of implantation dowel one end
At 180 ° of crotches, drilling makes crotch insert in the hole with direction across bridge direction at 45 ° after injecting the anchoring adhesive of 1/3 hole depth amount, completes
The installation of antidetonation anchor system；
Step 3: longitudinal reinforcement is installed by spacing 10-12cm, passes through hook in implantation dowel position, it will be horizontal by spacing 10-12cm
To reinforcement installation on the longitudinal reinforcement, hook is passed through in implantation dowel position；
Step 4: preparing steel fiber reinforced concrete, after sufficiently irrigating basal plane with water, pour steel fiber reinforced concrete, abundant vibration compacting carries out
Health；
Step 5: after cleaning concrete surface, at least three times formation waterproof layers of brushing water-repellent paint pave thin after coating is dry
Layer bituminous concrete, grinding forming；After thin-layer bituminous concrete is down to atmospheric temperature, cleaning, which is enclosed, covers, open to traffic.
Further, the steel fiber reinforced concrete uses the pure fiber concrete of C50 steel fibre, and wherein content of steel fiber is
60kg/m3, pure fiber content are 1kg/m3；The waterproof layer uses cement based penetration crystallization type water proofing paint, and total dosage is
1800g/m2；The trench depth of the bumps rough surface is 4-6mm.
Compared with prior art, the present invention has following remarkable result:
1, concrete sealing off and covering anchorage is raised compared to tradition, detects mud jacking plumpness, re-start pipeline ftercompction slurry scheme, the present invention is existing
Field operation is simple, and work efficiency is high, can all cover all vertical prestressed reinforcements, not stay hidden danger, good reliability, safety is good, makes
Valence is low.
2, reinforcing bar in length and breadth of the invention and be implanted into reinforcing bar processing, weldering nail with hammer strap welding, steel plate aperture and
The critical processes such as hot galvanizing are completed in factory, and operability and controllability are good, avoid that live wind, rain, mist etc. are severe to be applied
Work environment influences, and greatly improves integral construction quality, it is ensured that system reliability.
3. gluing base expanding and base expanding anchor bolt of the invention has the function of mechanical self-latching anchoring, anchor bolt dowel is anchored using anchoring adhesive,
Stronger resistance earthquake motive force load performance is all had, so that the anti-ejection system of the prestressing force has stronger function of seismic resistance, in pole
The stability of the anti-ejection system of prestressing force can be maintained under the complex working condition of end；Lifetime of system is theoretically identical as bridge life, greatly
Ground improves the safety of such bridge, has pushed the development of Technology Bridge Strengthening.
4. the present invention is not required to totally-enclosed traffic, can construct when being partially open to traffic, under bridge for local Roadway Construction
It is open to traffic and has no effect, it is with the obvious advantage on heavy traffic bridge and on the frequent navigation channel of navigation, it is set without large-tonnage
Standby and bracket etc., farthest reduces construction interim measure expense, and reliable, environmental protection has good society and economic effect
Benefit.
Detailed description of the invention
The existing vertical prestressed reinforcement of Fig. 1 pops up schematic diagram.
Fig. 2 is that the anti-ejection system general layout of the vertical prestressed reinforcement with function of seismic resistance of the embodiment of the present invention is vertical
Face figure.
Fig. 3 is that the anti-ejection system general layout of the vertical prestressed reinforcement with function of seismic resistance of the embodiment of the present invention is flat
Face figure.
Fig. 4 is the bridge floor functional rehabilitation system of the embodiment of the present invention.
Fig. 5 is the cementing buffer system of the embodiment of the present invention.
Fig. 6 is the impact force decentralized system of the embodiment of the present invention.
Fig. 7 is the antidetonation anchor system of the embodiment of the present invention.
Fig. 8 is bituminous concrete process signal in milling vertical prestressed reinforcement top surface in construction method of the embodiment of the present invention
Figure.
Fig. 9 is that implantation anchor bolt dowel installs antidetonation anchor system process schematic in construction method of the embodiment of the present invention.
Figure 10 is that impact force decentralized system process schematic is installed in construction method of the embodiment of the present invention.
Figure 11 is to pour cementing buffer system process schematic in construction method of the embodiment of the present invention.
Figure 12 is the bridge floor functional rehabilitation systematic procedure schematic diagram that paves in construction method of the embodiment of the present invention.
In figure: 1- original bridge floor bituminous concrete；The untouched anchor concrete of 2-；The upper anchorage of 3-；4- bituminous concrete block；5- coagulation
Soil block；The upper anchor plate of 6-；7- box girder cantilever board concrete；8- vertical prestressed reinforcement；9- hole path pressure grouting material；10- box girder web
Concrete；Anchor plate under 11-；12- lower nut；13- box beam underplate concrete；14- steel fiber reinforced concrete；The thin-layer bituminous coagulation of 15-
Soil；16- WELDING STUDS；17- steel bonding glue；The direct hammer strap of 18-；19- gluing base expanding and base expanding anchor bolt；20- is implanted into dowel；21- is lateral
Reinforcing bar；22- longitudinal reinforcement；23- waterproof layer；24- anchoring adhesive；25- bumps rough surface；26- concrete plane.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in Figures 2 and 3, the anti-ejection system of a kind of vertical prestressed reinforcement with function of seismic resistance, it is described vertical pre-
The anti-ejection system of stress reinforcing bar from top to bottom successively includes bridge floor functional rehabilitation system, cementing buffer system, impact force disperse system
System, antidetonation anchor system,
As shown in figure 4, the bridge floor functional rehabilitation system from top to bottom successively includes thin-layer bituminous concrete 15 and waterproof layer
22,22 major function of waterproof layer prevents steam from penetrating into cementing buffer system, protects antidetonation anchor system and impact force dispersion
The steel of system are not corroded, and the thin-layer bituminous concrete 15 will restore and original deck paving consistency function, use
Laminate structure has early, reduction road traveling noise of good antiskid performance, abrasion resisting, open to traffic etc. excellent with a thickness of 2 ~ 4 cm
Performance.
As shown in figure 5, the thickness of the cementing buffer system is at least 8 cm, including setting is poured in the impact force point
Steel fiber reinforced concrete 14 in the system of dissipating, using the pure fiber concrete of C50 steel fibre, content of steel fiber 60kg/m3, pure fiber content
1kg/m3, for by antidetonation anchor system and the impact force decentralized system is cementing is integrated, the cementing buffer system have compared with
Strong bending resistance drawing, shock resistance and anti-fatigue performance, can effectively disperses impact forces, inhibit inside concrete microcrack extension and
The formation of macrocrack.
As shown in fig. 6, the impact force decentralized system includes several longitudinal reinforcement 22 and transverse steel 21 being uniformly arranged,
It is all made of HRB400 reinforcing bar, is consolidated at the crotch of the implantation dowel 20 with the intersection of the longitudinal reinforcement 22 and transverse steel 21
Fixed connection.Wherein, the transverse steel 21 is located above longitudinal reinforcement 22, and interplanar spacing 10cm, diameter is at least
16mm, net protective layer thickness are at least 3cm, and the diameter of the longitudinal reinforcement 22 is at least 12mm, interplanar spacing 10cm.
As shown in fig. 7, the antidetonation anchor system includes implantation dowel 20 of the top with crotch, gluing base expanding and base expanding anchor bolt
19, direct hammer strap 18, steel bonding glue 17, WELDING STUDS 16, the gluing base expanding and base expanding anchor bolt 19 are fixed in box beam concrete, institute
Direct hammer strap 18 is stated to be fixed on box beam concrete upper surface by gluing base expanding and base expanding anchor bolt 19 and steel bonding glue 17 and cover
8 upper end of vertical prestressed reinforcement, the WELDING STUDS 16 are weldingly fixed on 18 upper surface of direct hammer strap vertically.
The implantation dowel 20 uses HRB400 reinforcing bar, in the quincuncial arrangement of plane in length and breadth, spacing 30x30cm,
One end is anchored in concrete using anchoring adhesive 24, and anchorage depth is greater than 10 times of bar diameters, and other end is curved equipped with 180 °
Head catches on the transverse steel outside of the impact force decentralized system.
The gluing base expanding and base expanding anchor bolt 19 uses 8.8 grades of hot-dip galvanized alloy steel, and the expansion anchor section length of bottom is at least 1/5
Anchor bolt length, expanded- angle are at least 20 degree, and anchor pole and nut hot galvanized layer thickness are at least 100 um, each gluing base expanding and base expanding anchor bolt
Spacing 40x40cm is arranged 19 planes in length and breadth, is evenly arranged four around 8 periphery of vertical prestressed reinforcement, one end is using plant
Muscle glue 24 is anchored in concrete, and anchorage depth is greater than 10 times of anchor bolt diameters, and other end screw cap anchoring is in direct impact resisting steel
18 edge of plate.Then subdrilling cut-off hole when construction reuses reaming tool in the bottom of anchor hole and is pre-formed reaming, injection 1/3
The anchoring adhesive of hole depth amount, insertion gluing base expanding and base expanding anchor bolt make the expanding mechanism of anchor bolt in bottom by way of tapping anchor bolt casing
It is expanded in reaming, fills up the space that bottom has been expanded, form antiseismic mechanical self-latching anchoring function.
The direct hammer strap 18 is not less than the Q345C steel plate of 12mm using thickness, passes through pressure injection steel bonding glue
17 are pasted onto top of concrete, and non-adhesive surface carries out hot galvanizing, and galvanized layer thickness is at least 100um.
The steel bonding glue 17 is that direct hammer strap and the critical material of cast concrete base bonding are adopted with a thickness of 2-4mm
With A grades of glue of I class, makes the direct hammer strap 18 that adhesion strength just drawn concrete to be at least 2.5 MPa and be concrete
Cohesional failure.
The WELDING STUDS 16 is welded with socket cap using electric arc stud welding and is followed closely, material ML15, by the spacing plane of 20x20cm
Around 8 periphery of vertical prestressed reinforcement, welding is arranged in 18 top surface of direct hammer strap in length and breadth, around vertical
Deformed bar periphery arranges 4.Each WELDING STUDS 16 gos deep into and stretches out the outermost layer reinforcing bar of the impact force decentralized system at least
1cm guarantees that direct hammer strap participates in cementing buffer system and impact force decentralized system forms entirety, common to resist instantaneous punching
Hit power.
It is a kind of as mentioned with the vertical prestressed reinforcement anti-ejection system of function of seismic resistance as shown in Fig. 8 to Figure 12
Construction method, comprising steps of
Step 1: being covered as shown in figure 8, carrying out local traffic and enclosing, along direction across bridge in 8 two sides of vertical prestressed reinforcement at least 1m range
The former bridge floor bituminous concrete 1 of 8 top surface of milling vertical prestressed reinforcement, wherein to the position for pasting direct hammer strap 18
Cleared up, chipping it is suitable, expose hard concrete plane 26, other indirect 18 position dabbings of hammer strap obtain bumps
The trench depth of rough surface 25, the bumps rough surface 25 is 6mm, completes base treatment.
Step 2: as shown in figure 9, direct hammer strap 18 is opened grout hole and anchor hole, WELDING STUDS 16 is welded, it is non-stick
Veneer hot galvanizing；Subdrilling cut-off hole when fixed gluing base expanding and base expanding anchor bolt 19, it is preparatory in the bottom of anchor hole then to reuse reaming tool
Reaming is formed, the anchoring adhesive 24 of injection at least 1/3 hole depth amount makes gluing base expanding and base expanding anchor bolt 19 by way of tapping anchor bolt casing
Expanding mechanism expanded in the reaming of bottom, fill up the space that bottom has been expanded, form antiseismic mechanical self-latching anchoring function
Can, after the gluing base expanding and base expanding anchor bolt 19 and direct hammer strap 18 are installed, tighten anchor bolt, edge sealing, pressure injecting glue；Anchor will be implanted into
180 ° of crotches are processed into 20 one end of muscle, and drilling makes crotch and direction across bridge direction at 45 ° after injecting the anchoring adhesive 24 of 1/3 hole depth amount
It inserts in the hole, completes the installation of antidetonation anchor system, in this step, direct 18 periphery of hammer strap is with satisfactory
Material edge sealing, can potting compound after solidification.
Step 3: as shown in Figure 10, longitudinal reinforcement 22 being installed by spacing 10, hook is passed through in implantation 20 position of dowel, between pressing
Transverse steel 21 is mounted on above the longitudinal reinforcement 22 away from 10, passes through hook in implantation 20 position of dowel.
Step 4: as shown in figure 11, preparing steel fiber reinforced concrete 14, the steel fiber reinforced concrete 14 uses the pure fibre of C50 steel fibre
Concrete is tieed up, wherein content of steel fiber is 60kg/m3, and pure fiber content is 1kg/m3, after sufficiently irrigating basal plane with water, pours steel
Fine concrete 14, abundant vibration compacting carry out health.
Step 5: as shown in figure 12, after cleaning concrete surface, at least three times formation waterproof layers 23 of brushing water-repellent paint, institute
The waterproof layer 23 stated uses cement based penetration crystallization type water proofing paint, and total dosage is that 1800g/m2 paves thin after coating is dry
Layer bituminous concrete 15, grinding forming；After thin-layer bituminous concrete 15 is down to atmospheric temperature, cleaning, which is enclosed, covers, open to traffic.
The processing of reinforcing bar and implantation reinforcing bar, weldering nail and hammer strap welding, steel in length and breadth in the construction method of the present embodiment
The critical processes such as the aperture and hot galvanizing of plate are completed in factory, and operability and controllability are good, avoid live wind, rain, mist
It is influenced etc. severe construction environment, greatly improves integral construction quality, it is ensured that system reliability, local Roadway Construction, no
Need totally-enclosed traffic, can construct when being partially open to traffic, have no effect to being open to traffic under bridge, on heavy traffic bridge and
It opens the navigation or air flight with the obvious advantage on frequent navigation channel, field operation is simple, and work efficiency is high, can all cover all vertical prestressed reinforcements, no
Hidden danger is stayed, lifetime of system is theoretically identical as bridge life, greatlys improve the safety of such bridge, has pushed bridge strengthening
The development of technology, good reliability, safety is good, and the feature of environmental protection is good, low cost, has good society and economic benefit.
The above embodiment of the present invention is not limiting the scope of the present invention, and embodiments of the present invention are not limited to
This, above content according to the present invention, according to the ordinary technical knowledge and customary means of this field, not departing from, the present invention is above-mentioned
Under the premise of basic fundamental thought, modification, replacement or change to other diversified forms that above structure of the present invention is made are all fallen within
Within protection scope of the present invention.
Claims (10)
1. a kind of anti-ejection system of vertical prestressed reinforcement with function of seismic resistance, it is characterised in that: the vertical prestressing steel
The anti-ejection system of muscle from top to bottom successively includes bridge floor functional rehabilitation system, cementing buffer system, impact force decentralized system, antidetonation
Anchor system,
The bridge floor functional rehabilitation system from top to bottom successively includes thin-layer bituminous concrete (15) and waterproof layer (22)；
The antidetonation anchor system includes implantation dowel (20) of the top with crotch, gluing base expanding and base expanding anchor bolt (19), direct anti-impact
Steel plate (18), steel bonding glue (17), WELDING STUDS (16) are hit, the gluing base expanding and base expanding anchor bolt (19) is fixed in box beam concrete, described
Direct hammer strap (18) is fixed on box beam concrete upper surface and is covered by gluing base expanding and base expanding anchor bolt (19) and steel bonding glue (17)
Vertical prestressed reinforcement (8) upper end is covered, the WELDING STUDS (16) is weldingly fixed on the direct hammer strap (18) vertically
Upper surface；
The impact force decentralized system includes several longitudinal reinforcements (22) and transverse steel (21) being uniformly arranged, the implantation anchor
It is fixedly connected at the crotch of muscle (20) with the intersection of the longitudinal reinforcement (22) and transverse steel (21)；
The cementing buffer system includes pouring the steel fiber reinforced concrete (14) being arranged on the impact force decentralized system, and being used for will
The antidetonation anchor system and impact force decentralized system is cementing is integrated.
2. the anti-ejection system of the vertical prestressed reinforcement according to claim 1 with function of seismic resistance, it is characterised in that: institute
The implantation dowel (20) stated is in the quincuncial arrangement of plane in length and breadth, and spacing 30x30cm, one end is using anchoring adhesive (24) anchoring
In concrete, anchorage depth is greater than 10 times of bar diameters, and other end is equipped with 180 ° of elbows, catches on the impact force disperse system
On the outside of the transverse steel of system.
3. the anti-ejection system of the vertical prestressed reinforcement according to claim 1 with function of seismic resistance, it is characterised in that: institute
The expansion anchor section length for stating gluing base expanding and base expanding anchor bolt (19) bottom is at least 1/5 anchor bolt length, and expanded- angle is at least 20 degree, anchor pole
And nut hot galvanized layer thickness is at least 100 um, spacing 40x40cm is arranged each gluing base expanding and base expanding anchor bolt (19) plane in length and breadth, is enclosed
It is evenly arranged around vertical prestressed reinforcement (8) periphery, one end is anchored in concrete using anchoring adhesive (24), and anchorage depth is big
In 10 times of anchor bolt diameters, other end screw cap anchoring is at direct hammer strap (18) edge.
4. the anti-ejection system of the vertical prestressed reinforcement according to claim 1 with function of seismic resistance, it is characterised in that: institute
The thickness for stating direct hammer strap (18) is greater than 12mm, is pasted onto top of concrete by pressure injection steel bonding glue (17),
Non- adhesive surface carries out hot galvanizing, and galvanized layer thickness is at least 100um.
5. the anti-ejection system of the vertical prestressed reinforcement according to claim 1 with function of seismic resistance, it is characterised in that: institute
That states steel bonding glue (17) is drawing the direct hammer strap (18) just concrete viscous with a thickness of 2-4mm using A grades of glue of I class
Knotting strength is at least 2.5MPa and is concrete cohesional failure.
6. the anti-ejection system of the vertical prestressed reinforcement according to claim 1 with function of seismic resistance, it is characterised in that: institute
Stating WELDING STUDS (16), around the vertical prestressed reinforcement (8) periphery, welding is arranged in length and breadth by the spacing plane of 20x20cm
Direct hammer strap (18) top surface, each WELDING STUDS (16) go deep into and stretch out the outermost layer steel of the impact force decentralized system
Muscle at least 1cm.
7. the anti-ejection system of the vertical prestressed reinforcement according to claim 1 with function of seismic resistance, it is characterised in that: institute
The transverse steel (21) stated is located at longitudinal reinforcement (22) above, and interplanar spacing 10-12cm, diameter is at least 16mm, net to protect
Covering thickness is at least 3cm, and the diameter of the longitudinal reinforcement (22) is at least 12mm, interplanar spacing 10-12cm.
8. the anti-ejection system of the vertical prestressed reinforcement according to claim 1 with function of seismic resistance, it is characterised in that: institute
State cementing buffer system thickness and be at least 8 cm, the thin-layer bituminous concrete (15) with a thickness of 2 ~ 4 cm.
9. a kind of construction party of the anti-ejection system of vertical prestressed reinforcement according to claim 1 with function of seismic resistance
Method, which is characterized in that comprising steps of
Step 1: progress local traffic, which is enclosed, covers, vertical in at least 1m range milling of vertical prestressed reinforcement (8) two sides along direction across bridge
The former bridge floor bituminous concrete (1) of deformed bar (8) top surface, wherein to paste the position of direct hammer strap (18) into
Row cleaning, chipping are suitable, expose hard concrete plane (26), other indirect hammer strap (18) position dabbings obtain recessed
Convex rough surface (25) completes base treatment；
Step 2: direct hammer strap (18) being opened into grout hole and anchor hole, is welded WELDING STUDS (16), non-adhesive surface hot dip
Zinc；Then subdrilling cut-off hole reuses reaming tool in the bottom of anchor hole and is pre-formed reaming, injection at least 1/3 hole depth amount
Anchoring adhesive (24) installs the gluing base expanding and base expanding anchor bolt (19) and direct hammer strap (18), tightens anchor bolt, edge sealing, pressure note
Glue；Will implantation dowel (20) one end be processed into 180 ° of crotches, drill, inject 1/3 hole depth amount anchoring adhesive (24) after, make crotch with
Direction across bridge direction at 45 ° inserts in the hole, and completes the installation of antidetonation anchor system；
Step 3: by spacing 10-12cm installation longitudinal reinforcement (22), hook is passed through in implantation dowel (20) position, by spacing 10-
Transverse steel (21) is mounted on the longitudinal reinforcement (22) above by 12cm, passes through hook in implantation dowel (20) position；
Step 4: preparing steel fiber reinforced concrete (14), after sufficiently irrigating basal plane with water, pour steel fiber reinforced concrete (14), sufficiently vibrate close
It is real, carry out health；
Step 5: after cleaning concrete surface, at least three times formation waterproof layers (23) of brushing water-repellent paint, after coating is dry, booth
Spread thin-layer bituminous concrete (15), grinding forming；After thin-layer bituminous concrete (15) is down to atmospheric temperature, cleaning, which is enclosed, covers, and opens
Put traffic.
10. construction method according to claim 9, it is characterised in that: the steel fiber reinforced concrete (14) is fine using C50 steel
Pure fiber concrete is tieed up, wherein content of steel fiber is 60kg/m3, and pure fiber content is 1kg/m3；The waterproof layer (23) is adopted
With cement based penetration crystallization type water proofing paint, total dosage is 1800g/m2；The trench depth of the bumps rough surface (25) is 4-
6mm。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287090A (en) * | 2020-02-25 | 2020-06-16 | 陕西建工机械施工集团有限公司 | External grouting anchor sealing device for large-section cast-in-situ box girder beam end anchor and construction method |
| CN112982188A (en) * | 2021-02-10 | 2021-06-18 | 同济大学 | Method for rebuilding or adding vertical prestress to active concrete bridge |
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| JP2004068341A (en) * | 2002-08-05 | 2004-03-04 | Kajima Corp | Bridge superstructure |
| CN2739290Y (en) * | 2004-09-18 | 2005-11-09 | 柳州欧维姆机械股份有限公司 | Steel strand vertical prestress anchoring system |
| CN204418017U (en) * | 2014-12-18 | 2015-06-24 | 福建省南平市公路局 | Highway bridge deck paving ultrathin overlay repair structure |
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| CN111287090A (en) * | 2020-02-25 | 2020-06-16 | 陕西建工机械施工集团有限公司 | External grouting anchor sealing device for large-section cast-in-situ box girder beam end anchor and construction method |
| CN112982188A (en) * | 2021-02-10 | 2021-06-18 | 同济大学 | Method for rebuilding or adding vertical prestress to active concrete bridge |
| CN112982188B (en) * | 2021-02-10 | 2022-06-14 | 同济大学 | Method for rebuilding or adding vertical prestress to active concrete bridge |
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| CN109468943B (en) | 2019-07-12 |
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