CN208346657U - The antidumping anti-fall girder apparatus that existing bridge is added - Google Patents

Abstract

The utility model discloses the antidumping anti-fall girder apparatus that existing bridge is added; the structure includes the upper and lower girder falling being arranged on bent cap and box beam crossbeam; upper and lower girder falling is connected by steel strand wires connector; steel strand wires connector both ends are pierced by lower girder falling, upper girder falling respectively, and spring, baffle plate, fixture nut and protective cover is respectively set in both ends end.The antidumping anti-fall girder apparatus that the utility model uses above-mentioned technology to obtain, when loaded vehicle leans on the outside of bridge when driving, steel strand wires passively tense stress on the inside of box beam, it is additionally provided the anchorage of a bridge, to reach the ability of enhancing bridge antidumping, improve the force-bearing situation of bridge, eliminate the security risk of existing highway bridge, its construction technology is easy to operate, worker is easy to grasp, speed of application is fast, and there is preferable economic benefit and social benefit, facilitate application, adds anti-fall girder apparatus construction especially suitable for camber beam, linear beam, profiled beam etc..

Description

The antidumping anti-fall girder apparatus that existing bridge is added

Technical field

The utility model belongs to technical field of building construction, and in particular to the antidumping girder falling dress that existing bridge is added It sets.

Background technique

It is in all parts of the country after reform and opening-up to have built a large amount of highway, Urban Bridge one by one, wherein being no lack of large bridge Grade separation intercommunication.With the fast development of society and economic construction, vehicle carrying capacity, running speed are quickly improved, to existing bridge The grade separation bridge intercommunication that the bearing capacity of beam, resistance to capsizing propose severe challenge, especially Earlier designs is more severe.

The grade separation bridge intercommunication superstructure of Earlier designs uses cast-in-situ steel reinforced concrete camber beam, substructure base substantially This uses pier stud+bent cap form, and support is arranged in bent cap top again.Due to being restricted by society at that time, economic condition, Earlier designs Often turning radius is smaller for bridge intercommunication, and box beam line style curvature is larger, and one of main feature of such bridge, which is exactly that bridge is anti-, inclines It is poor to cover ability, when loaded vehicle leans on the outside of bridge when driving, box beam seriously jeopardizes row there are seat empty and the security risk toppled Vehicle safety.The news report toppled in relation to bridge by resistance to capsizing deficiency has been had already appeared in relevant report.? Today of rapid economic development, vehicle carrying capacity significantly improve, and road loaded vehicle gradually increases, to the carrying energy of existing highway bridge Power, resistance to capsizing propose severe challenge.In order to meet fast-developing transport need, this is just needed using a kind of good side Method reinforces existing highway bridge resistance to capsizing, to reach the normal use and bridge structure safe that neither influence bridge, again Enhance its safety and the requirement of durability.

Utility model content

For the above-mentioned problems in the prior art, the purpose of this utility model is to provide what existing bridge was added to resist Topple anti-fall girder apparatus.It can solve the construction of existing existing highway bridge various resistance to capsizings it is insufficient the problems such as, especially suitable for Camber beam, linear beam, profiled beam etc. add anti-fall girder apparatus construction.

The antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that lower anti-on bent cap including being arranged in The upper girder falling for falling beam and being arranged on box beam crossbeam, the lower girder falling are connect with upper girder falling by steel strand wires connector, Steel strand wires connector both ends are pierced by lower girder falling, upper girder falling respectively, and spring, baffle plate, solid is respectively set in both ends end Determine nut and protective cover, spring is set between girder falling outer end face and baffle plate, and fixture nut is arranged outside baffle plate, is protected Shield is connected on girder falling outer end face, and steel strand wires connector both ends are surrounded.

The antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that lower girder falling and upper anti-fall girder construction It is identical, and opposite steel strand wires connector setting symmetrical above and below, girder falling include pedestal and bracket, the pedestal passes through bar planting screw rod Bent cap is fixed on, on box beam crossbeam with bar planting nut, the contact surface fill concrete of pedestal and bent cap, box beam crossbeam；Bracket weldering Setting is connect in chassis outer side, and the above and below of bracket is equipped with for wearing the mounting hole for penetrating steel strand wires connector.

The antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that pedestal includes vertical steel plate and setting Connecting plate between vertical steel plate and girder falling, vertical steel plate are fixed on bent cap, box beam by bar planting screw rod and bar planting nut On crossbeam, connecting plate and vertical steel plate are welded to connect, shape between vertical steel plate, connecting plate and bent cap or the contact surface of box beam crossbeam At cavity in fill concrete.

The antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that connecting plate is square structure or angular Structure.

The antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that bracket is to be welded to connect shape by steel plate At cube structure, with vertical steel plate be welded to connect, upper steel plate, the lower steel plate of cube, which are correspondingly provided with, penetrates steel strand wires for wearing The mounting hole of connector is equipped with cushion between upper steel plate and spring.

The antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that be equipped on the inside of the upper steel plate of cube Two pieces of fixing steel plates, fixing steel plate are located at the two sides of mounting hole, pass through bolt between two pieces of fixing steel plates and be equipped with deflector, be biased to Device is spliced by two blocks of wedge-shaped wood.

The antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that steel strand wires connector includes that steel twists Line is arranged PE housing on steel strand wires, and steel strand wires both ends are equipped with anchoring cartridge, and fixture nut is connected on anchoring cartridge.

The construction method for the antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that including walking as follows It is rapid:

1) design drawing is familiar in preparation of construction, understands engineering construction environment, investigates bridge status situation, to scene Place is cleared up, and ground is hardened, and is checked that passed examination rear is again comprehensively to material, the mechanical equipment etc. marched into the arena It comes into operation；

2) setting up operating platform operating platform is construction personnel's job platform, for carrying out concrete surface treatment, bar planting, steel plate The work such as erecting and welding, concreting, the installation of steel strand wires connector, external surface of structural member anticorrosive coating, including operation at sea are applied Work putting up platform and land operation operation platform are set up；

3) for steel planting according to design drawing, the construction technology of steel planting is as follows: bar planting hole construction layout → drilling → Concrete surface treatment → duct cleaning → injecting glue → bar planting；

4) steel plate production, installation and site welding

Bracket, the pedestal of anti-fall girder apparatus are all made of steel construction, and steel plate exists according to the size that design and construction drawing requires Factory's blanking production processing, is transported to live fragment after processing is completed and is installed and carried out site welding, steel plate in-site installation is adopted Steel plate is hung to predetermined position with the mode of chain block and is fixed temporarily, scene splicing welding procedure is then carried out；Bottom Seat steel plate grout hole and grout outlet needed for bent cap, the reserved casting concrete in box beam crossbeam position, while to pedestal steel plate Inner surface carries out cleaning and coarse processing, smears concrete interfacial agents, effectively bonds after guaranteeing concrete placings；

5) pea gravel concreten or grouting material are used concrete delivery pipe from fill orifice by concrete placings, maintenance and test block indwelling It pours into, until concrete flows out through grout outlet, concrete vibrating is carried out using attached vibrator when grouting；It is pressed in casting process Code requirement indwelling test cube in the same condition and standard maintaining test block carry out covering moisture-keeping maintaining to concrete after pouring；

6) steel strand wires connector, protective cover installation

When concrete strength meets code requirement, deflector is successively installed, cushion, steel strand wires connector, spring, is stopped Baffle, fixture nut and protective cover；

7) anti-fall girder apparatus anticorrosive coating is according to anti-fall girder apparatus local environment, to anti-fall girder apparatus successively through surface cleaning Processing, derusting by sandblasting, surface roughness, priming paint, intermediate coat, finishing coat processing；

8) job platform is removed after anti-fall girder apparatus anticorrosive coating is completed and passes through examination, is torn open to job platform It removes.

The construction method for the antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that operation at sea construction Platform includes pier stud in water, arc hoop plate and I-steel, and the arc hoop plate is two pieces, and arc hoop plate is matched with pier stud in water, The welding of arc hoop plate two sides is equipped with side plate, and two pieces of arc hoop plate settings outside pier stud, are passed through on side plate in water by connection bolt Connecting hole is fixedly connected, and several I-steel are arranged in interval welding on arc hoop plate, and I-steel upper and lower surfaces are equipped with limited block, work Girder steel support, side plate and arc hoop plate are respectively equipped between pier stud, at I-steel and arc hoop plate connection inner corner trim in word steel and water Junction is welded with stiffener.

The construction method for the antidumping anti-fall girder apparatus that the existing bridge is added, it is characterised in that the tool of steel planting Body process is as follows:

According to it is quasi- add the measuring on bent cap and box beam crossbeam of anti-fall girder apparatus screw position go out girder falling Up/down base and Bar planting hole site carries out Completion of Drilling Hole using impact drill, requires further according to design drawing and combine in-site measurement determination that need to cut Bent cap and box beam crossbeam concrete range, manually cut the surface layer mortar on concrete surface, keep coarse aggregate exposed, then is clear with concrete wire brush Except surface laitance, surface porosity object is rejected；Duct is cleared up again, is first cleared up with hard mane brush, is removed most of in duct Dust, then it is blown into high pressure dry air, blow away bottom hole dust, fragment and moisture；Anchoring adhesive is perfused by bottom hole after the cleaning of duct To hole depth 2/3；The dirts such as iron rust, the grease stain of bar planting screw surface are removed, bottom hole is slowly inserted to by the way of reverse rotation, The anchoring adhesive that aperture is overfilled is purged.

By using above-mentioned technology, compared with prior art, the utility model has the following beneficial effects:

The utility model is utilized by installing girder falling or more bracket in pier stud bent cap position and top box beam crossbeam position The screw rod of implantation and the concrete steel plate of filling make girder falling pedestal and bracket and existing bent cap and box beam form entirety, and Steel strand wires are tightened with nut to the finished steel strand wires of drawing-in, and at both ends between upper and lower bracket, when loaded vehicle travels on the outside of bridge When, box beam inside steel strand wires passively tense stress, are additionally provided the anchorage of a bridge, to reach, enhancing bridge is anti-to incline The ability covered improves the force-bearing situation of bridge, eliminates the security risk of existing highway bridge, and construction technology is easy to operate, worker Be easy to grasp, speed of application it is fast, and have preferable economic benefit and social benefit, facilitate application, especially suitable for song Line beam, linear beam, profiled beam etc. add anti-fall girder apparatus construction.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is the steel strand wires connecting-piece structure schematic diagram of the utility model；

Fig. 3 is the hoop plate cantilever beam structure schematic diagram of the utility model；

Fig. 4 is the top view of Fig. 3；

Fig. 5 is the A-A the schematic diagram of the section structure in Fig. 4.

Specific embodiment

Below in conjunction with Figure of description, the utility model will be further described, but the protection scope of the utility model is simultaneously It is not limited only to this:

As shown in Figs. 1-2, the antidumping anti-fall girder apparatus that the existing bridge of the utility model is added, including be arranged in bent cap Lower girder falling on 3 and the upper girder falling being arranged on box beam crossbeam 1, the lower girder falling and upper girder falling pass through steel strand wires company Fitting 6 connects, and 6 both ends of steel strand wires connector are pierced by lower girder falling, upper girder falling respectively, and spring is respectively set in both ends end 9, baffle plate 10, fixture nut 11 and protective cover 12, spring 9 are set between girder falling outer end face and baffle plate 10, fixed spiral shell Mother 11 is arranged outside baffle plate 10, and protective cover 12 is connected on girder falling outer end face, and 6 both ends of steel strand wires connector are surrounded.

Lower girder falling is identical as upper anti-fall girder construction, and the opposite setting symmetrical above and below of steel strand wires connector 6, girder falling include Pedestal 4 and bracket 5, the pedestal 4 are fixed on bent cap 3 by bar planting screw rod 2 and bar planting nut 13, on box beam crossbeam 1, pedestal 4 With the contact surface fill concrete of bent cap 3, box beam crossbeam 1；The welding setting of bracket 5 is on the outside of pedestal 4, and the above and below of bracket 5 Equipped with for wearing the mounting hole 503 for penetrating steel strand wires connector 6；The pedestal 4 includes vertical steel plate 401 and is arranged in vertical steel plate Connecting plate 402 between 401 and girder falling, vertical steel plate 401 are fixed on bent cap 3, case by bar planting screw rod 2 and bar planting nut 13 On beam crossbeam 1, connecting plate 402 and vertical steel plate 401 are welded to connect, and vertical steel plate 401, connecting plate 402 and bent cap 3 or box beam are horizontal Fill concrete in the cavity formed between the contact surface of beam 1, connecting plate 402 is square structure or angular knot in the utility model Structure, it is fixed with specific reference to the structure of bent cap 3, box beam crossbeam 1, if 3 contact surface of bent cap of the utility model is plane, thus under it is anti-fall Connecting plate 402 in beam is square structure, and 1 contact surface of box beam crossbeam is inclined-plane, thus in upper girder falling two sides connecting plate 402 be triangular structure.

As shown, the bracket 5 of the utility model is to be welded to connect the cube structure formed by steel plate, with vertical steel plate 401 are welded to connect, and upper steel plate 501, the lower steel plate 502 of cube are correspondingly provided with for wearing the mounting hole for penetrating steel strand wires connector 6 503, cushion 8 is equipped between upper steel plate 501 and spring 9；In order to improve its fastness and stability, and it is readily susceptible to installation steel and twists Wire connections 6, the utility model are equipped with two pieces of fixing steel plates 504 on the inside of upper steel plate 501, and fixing steel plate 504 is located at mounting hole 503 two sides are equipped with deflector 7 by bolt between two pieces of fixing steel plates 504, deflector 7 by two pieces of wedge-shaped wood splicings and At.

As shown in Fig. 2, the steel strand wires connector 6 of the utility model includes steel strand wires 602, it is arranged outside PE on steel strand wires 602 Set 603,602 both ends of steel strand wires are equipped with anchoring cartridge 601, and fixture nut 11 is connected on anchoring cartridge 601.

As shown, the construction method for the antidumping anti-fall girder apparatus that the existing bridge of the utility model is added, including such as Lower step:

1) preparation of construction

A is familiar with design drawing and relevant document；Understand engineering construction environment, bridge status situation is investigated, to existing Field place is cleared up, and ground is hardened, and realizes live " three supplies and one leveling "；

B works out existing bridge and adds antidumping anti-fall girder apparatus special construction plan, while reporting relevant departments' examination & approval true Recognize, and carries out written safe practice according to the scheme finally confirmed and tell somebody what one's real intentions are；

C calculates engineering construction project amount, is preferentially purchased to the quasi- material to come into operation, to material, the machinery marched into the arena Equipment etc. is checked comprehensively, can be come into operation after passed examination；

2) operating platform is set up

The main function of a operating platform is: predominantly construction personnel's job platform, on platform carry out concrete surface treatment, The work such as bar planting, steel plate erecting and welding, concreting, steel strand wires installation, external surface of structural member anticorrosive coating.It can be according to live real Border and itself construction equipment, organization arrangement are taken in anti-fall girder apparatus position to be added using former bridge pier and cushion cap or status ground If suitable operation platform, premised on guaranteeing structure safety;

B operation at sea operation platform is set up

Its structure is as in Figure 3-5, and operation at sea operation platform is to add girder falling dress quasi- using existing pier stud in water The job platform that pier stud lower position is formed using Member Weldings such as steel plate, I-steel in the water set, the operation at sea construction Platform includes pier stud 14 in water, arc hoop plate 16 and I-steel 18, and the arc hoop plate 16 is two pieces, in arc hoop plate 16 and water Pier stud 14 matches, and the welding of 16 two sides of arc hoop plate is equipped with side plate 19, and two blocks of arc hoop plates 16 are arranged outside pier stud 14 in water, by even Connecting bolt 20 is fixedly connected by the connecting hole on side plate 19, and several I-steel 18, work is arranged in interval welding on arc hoop plate 16 18 upper and lower surfaces of word steel are equipped with limited block 15, and in I-steel 18 and water between pier stud 14, I-steel 18 connect with arc hoop plate 16 Girder steel support 17 is respectively equipped at inner corner trim, side plate 19 and 16 junction of arc hoop plate are welded with stiffener；

Platform member is transported to pier stud position using barge or steamer and carries out on-site consolidation by operation at sea operation platform, is first existed Job platform is put up on ship, is then installed assembled good hoop plate cantilever beam to pier stud using chain block, adjustment hoop plate Cantilever beam position, tightens high-strength bolt, by two blocks of hoop plates and the secured banding of column；

C land operation operation platform is set up

When ground construction regional space is influenced by factors such as traffic above-grounds, operation platform form can be applied with operation at sea Work platform is identical, or using operating platform is arranged on bent cap, reduces the interference of anti-fall girder apparatus Construction on Ground traffic etc.； When land operation construction site spaciousness, conditions permit, the form progress for setting up full hall scaffold is can be used in construction operation platform, To reduce construction cost；

Full hall scaffold designs and sets up the scheme of having to comply with and " construction fastener type steel pipe scaffold safe practice rule Model " the current specifications requirement such as JGJ130；

3) steel planting

Steel planting construction technology: bar planting hole construction layout → drilling → concrete surface treatment → duct cleaning → injecting glue → plant Muscle.

Bar planting hole construction layout, according to it is quasi- add the measuring on bent cap and box beam crossbeam of anti-fall girder apparatus screw position go out it is anti- Beam Up/down base and bar planting hole site are fallen, is then drilled.Bar planting drilling is buried using impact drilled as holes, hole depth with anchorage screw If depth is identical, the big 2~3mm of aperture ratio anchorage screw, duct is answered straight.The hole when bar planting hole location encounters bent cap or box beam reinforcing bar Position should be avoided, after drilling, the bent cap and box beam that are required according to design drawing and combine in-site measurement determination that need to cut Crossbeam concrete range manually cuts the surface layer mortar on concrete surface, keeps coarse aggregate exposed, then removes surface laitance with concrete wire brush, picks Except surface porosity object, surface dust finally is blown down with compressed air or clear water rinses, Corrosion Reinforcement is derusted using rust remover, corrosion It is serious, reinforcement solutions are done to reinforcing bar by design requirement, both ends weld length is greater than 5d, duct cleaning first with hard mane brush into Row cleaning removes most of dust in duct, then is blown into high pressure dry air, blows away bottom hole dust, fragment and moisture, answers in hole Keep drying；Anchoring adhesive is perfused by bottom hole to hole depth 2/3 after the cleaning of duct, glue is full of entirely after being inserted into anchorage screw Duct；It should inspect for acceptance to screw diameter, length etc. before anchorage screw insertion.Screw surface should be removed before screw rod insertion The dirts such as iron rust, grease stain, insertion are slowly inserted to bottom hole by the way of reversely rotating, and the anchoring adhesive that aperture is overfilled should carry out clearly Remove, first removed, then cleaned with acetone with steel brush, and give wipe it is dry.

It should be conserved by code requirement after screw rod bar planting, resistance to plucking examination must be carried out by code requirement after maintenance It tests, next procedure of being allowed for access after pass the test.

4) steel plate production, installation and site welding

Anti-fall girder apparatus bracket, pedestal are all made of steel construction.The selection of anti-fall girder apparatus steel plate makes in factory's blanking processes, Live fragment is transported to after processing is completed to be installed and carry out site welding；

The measure that steel plate processing and fabricating will be required in strict accordance with design and construction drawing is processed, and in the construction process It often to inspect whether plate size meets the requirements by random samples, prevent steel plate fabrication and installation from malfunctioning；

Live screw rod may be because of evacuation bent cap and box beam crossbeam reinforcing bar, and there are certain deviations for physical location and design, therefore Bolt hole on steel plate is temporarily not constructed in factory process, to be carried out at the scene according to screw rod physical location before steel plate installation Aperture.

The Q235 steel plate that newly-increased anti-fall girder apparatus steel plate is all made of 1cm~2cm thickness carries out site welding installation, each steel of component Connection uses electric arc welding between plate, and weld seam grade butt weld grade is I grades, and fillet weld or groove welding are II grade.Construction Before should carry out qualification of welding procedure in advance.Its welding procedure and relevant parameter should be identical as employed in engineering actual fabrication. Welding operator must have corresponding operating and be on duty qualification, and no job qualification certificate person must not execute welding procedure.Steel plate site welding It is carried out as far as possible on ground, reduces the workload of overhead welding to the greatest extent, improve weldquality.Steel plate should be wanted after welding by specification It asks and each weld seam is checked, underproof weld seam must be welded again, next procedure of being all allowed for access after qualification.

Steel plate is hung to predetermined position by the way of chain block and is fixed temporarily by steel plate in-site installation, then into The splicing welding procedure of row scene.Consider that welding high temperature to the adverse effect of anchoring adhesive, should be taken effective in Member Welding Cooling measure, such as the towel that ice water was impregnated wrap the half of screw etc. being exposed.

Anti-fall girder apparatus pedestal steel plate close to bent cap and box beam position should reserve casting concrete needed for grout hole and go out Mouth is starched, while cleaning and coarse processing are carried out to pedestal steel plate inner surface, smears concrete interfacial agents, to guarantee after concrete placings effectively Bonding.

5) concrete placings, maintenance and test block indwelling

Concrete placings, maintenance and test block indwelling fill pea gravel concreten or grouting material using concrete delivery pipe from fill orifice Enter, until concrete flows out through grout outlet, concrete vibrating is carried out using attached vibrator when grouting；By rule in casting process Model requires indwelling test cube in the same condition and standard maintaining test block, carries out covering moisture-keeping maintaining to concrete after pouring；The utility model Before attached vibrator operation, form vibrator should be checked and tried to shake, when installation, vibrator bottom plate installation screw Position should be correct, foundation bolt installation skew should be prevented and keep casing impaired.Foundation bolt should fasten, the fastening journey of each bolt Degree should be consistent；When using more form vibrators simultaneously on an anti-fall girder apparatus, the frequency of each vibrator should keep one It causes, the vibrator of opposite face should be installed in a staggered manner；When form vibrator is mounted on anti-fall girder apparatus, each time of vibration is not answered More than 1min, when concrete in mould bleeding flowing or at it is horizontal can failure of oscillation, must not shake again in concrete initial set state；

6) steel strand wires, protective cover installation

The subsequent constructions such as anti-fall girder apparatus steel strand wires installation can be carried out when concrete strength meets code requirement,

Anti-fall girder apparatus by pedestal 4, bracket 5, steel strand wires connector 6, deflector 7, cushion 8, spring 9, baffle plate 10, The composition such as fixture nut 11, protective cover 12, construction technology process: deflector installation → cushion installation → steel strand wires, stops spring Baffle, nut installation → protective cover installation:

Deflector 7 is bolted on two pieces of fixing steel plates 504 of 501 inside of bracket upper steel plate, anti-fall girder apparatus Hot extrusion PE housing 603, PE after 602 finished product rope of steel strand wires is wrapped using 1860 grades of 7 φ s15.2 soap-free emulsion polymeization epoxy spray steel strands Housing 603 outer diameter φ 65, Fracture Force 1860kN, steel strand wires nominal area 980mm²；

When steel strand wires device is installed, copes with 601 surface portion of anchoring cartridge up and down and coat the antiseptic oil that will not be flowed at 80 DEG C Rouge, the installation of steel strand wires 602 should be vertical, and steel strand wires position should be hit exactly in duct, and squeeze steel strand wires phenomenon without duct, successively install Spring 9, baffle plate 10 tighten fixture nut 11 according to design requirement, and keeping 602 both ends of steel strand wires, there are about 200mm to move Amount installs dustproof protecting cover 12, and late maintaining need to every two years remove protective cover 12, checks steel strand wires 602, spring 9, baffle plate 10,11 surface stress condition of fixture nut when finding steel strand wires positional shift, adjusts steel strand wires position and stress condition in time.

7) anti-fall girder apparatus anticorrosive coating

According to anti-fall girder apparatus local environment, preservative treatment carried out to anti-fall girder apparatus surface, including surface cleaning processing, Several procedures such as derusting by sandblasting, surface roughness, priming paint, intermediate coat, finishing coat.Anticorrosive paint uses corrosion protection service life for 10 years weights Anticorrosive coating coating:

A surface cleaning: cleaning steel member surface and oil contaminant with organic solvent or metal cleaner, obtain it is oil-free, anhydrous, without dirt Object, without rust staining and without other clean surfaces including soluble-salt；

B derusting by sandblasting and rough surface: using sand-blasting machine to steel member carry out derusting by sandblasting, remove surface all corrosion and Welding slag etc. sputters object and former corrosion-inhibiting coating, and obtaining cleannes is Sa2.5 grades, and roughness is the surface of RZ40~80 μm；

C Seal treatment (including priming paint, intermediate coat, finishing coat): it is sealed using brushing, roller coating or airless spraying method It closes；First of the closing in outer surface uses roller coating or brushing method coating, remaining closing is sealed using high pressure airless spraying apparatus Coating is closed, to keep the consistency of integral color；

The main indicator of seal coat is thickness and adhesive force.Wherein first of seal coat thickness is lower, other each roads Closing should all reach design requirement, be checked using magnetic thickness tester；Seal coat adhesive force uses cross-hatching to be checked, At least 1 grade or more should be reached；For environment temperature preferably at 5~38 DEG C, relative humidity is not greater than 85% when the utility model coating, when Relative humidity should be painted with when being greater than 75% in 4h.

8) after job platform dismounting anti-fall girder apparatus anticorrosive coating is completed and passes through examination, job platform can be carried out and torn open It removes:

Operation at sea platform removal: first having cleared up the object on platform before removing, prevents from falling in dismounting；It removes to use and refute Ship or steamer carry out, and hang hoop plate cantilever beam using chain block, high-strength bolt 20 are then unclamped, by 16 cantilever of arc hoop plate Beam is removed and is slowly hung onto and steadily places on ship；

Land operation platform removal: strictly being removed by scheme and code requirement, is torn open afterwards according to setting up sequence and first taking Principle is successively removed.The object on platform has first been cleared up before removing, and prevents from falling in dismounting.The stand steel pipe of dismounting, button Part, top collet, template, lumps of wood etc. should all be stacked in category set, and stacking height must not exceed specification permission height.

The basic principle of the utility model is implanted into existing bent cap and the quasi- position for adding anti-fall girder apparatus of box beam crossbeam Screw rod, installation girder falling pedestal steel plate, and weld installation girder falling bracket；Then in pedestal and bent cap, the filling of box beam contact surface Concrete makes anti-fall girder apparatus and existing bent cap and box beam form whole common stress；Then install steel strand wires, cushion block, spring, Nut, tightening nut makes steel strand wires nature stress.When there is loaded vehicle to drive through on the outside of bridge, anti-fall girder apparatus on the inside of box beam Steel strand wires passively tense stress, are additionally provided the anchorage of a bridge, to reach the ability of enhancing bridge antidumping, energy The security risk for eliminating existing highway bridge rollover well, to extend the service life of bridge；And the old bridge of the utility model Strengthening reconstruction expense is only 10%~20% of newly building bridge or so, and the reinforcing expense of bridge is about to rebuild new bridge under normal circumstances 20%~30%, a large amount of fund can be saved for country with new bridge ratio is rebuild, economic results in society are very significant.

Application example

The maintenance engineerings such as maintenance and certain big bridge seat such as 11.1 certain overhead steel box-girder correction

The maintenance engineerings such as maintenance and the big bridge seat such as overhead steel box-girder correction include the grade separation and the bridge two parts, The grade separation mainly construct content include: to this it is overhead rectify a deviation across the section steel box-girder, and add steel lid in 36# and 38# pier Beam increases separately two sheet-type supports on steel lid beam, and rectifying by jack up is in place.It is added respectively in 35# pier and 39# pier capping beam both ends Antidumping anti-fall girder apparatus.To three steel box girder bridge face anticollision steel guard rails carry out F-C paint coating decoration and replacement 35# pier and 39# pier expansion joint rubber strip.

30 calendar day of engineering total construction period, the overhead steel box-girder building rectification went into operation from May 3rd, 2012, and May 31 completed All-work amount, the actual construction time 28 days.

Improved bridge is overall beautiful generous, considerably increases bridge resistance to capsizing, extends bridge service life, Construction quality meets the requirement of national associated acceptance solid specification, obtains the favorable comment of construction unit and supervisor.

11.2 Single column pier improvement project

Single column pier improvement project is to be transformed construction to certain overhead and certain two bridge block of grade separation part Single column pier.

Certain grade separation F1~F4(span setting 24+24+22.7m), F8~F11(span setting 24+24+21m), I5~I8 (span setting 21.1+30.5+24.1m) three ramp bridge is RC Continuous camber beam, and superstructure box beam is wide 7m, lower part bridge pier use the I shape pier with cap beam.Through detecting, each bridge pier bearing pad center of three ramp bridge of grade separation is away from smaller, in mistake It is difficult to meet antidumping requirement under big Under Eccentric Loading, needs to reinforce.

Vertical anti-fall girder apparatus is installed at the top of grade separation (F1-F4, the F8-F11, I5-I8 tri-) bent cap.Anti-fall girder apparatus Each pier two sides are arranged in, at intermediate pier center, 1/4 Dun Chu of abutment pier.

80 calendar day of engineering total construction period, the grade separation add anti-fall girder apparatus construction 30 calendar day of actual construction time.It is improved Bridge is overall beautiful generous, considerably increases bridge resistance to capsizing, and quality meets the requirement of national associated acceptance solid specification, obtains The favorable comment of construction unit and supervisor.

Claims (7)

1. the antidumping anti-fall girder apparatus that existing bridge is added, it is characterised in that including the lower girder falling being arranged on bent cap (3) And the upper girder falling being arranged on box beam crossbeam (1), the lower girder falling and upper girder falling are connected by steel strand wires connector (6) Connect, steel strand wires connector (6) both ends are pierced by lower girder falling, upper girder falling respectively, and both ends end be respectively set spring (9), Baffle plate (10), fixture nut (11) and protective cover (12), spring (9) be set to girder falling outer end face and baffle plate (10) it Between, fixture nut (11) setting is external in baffle plate (10), and protective cover (12) is connected on girder falling outer end face, steel strand wires are connected Fitting (6) both ends surround.

2. the antidumping anti-fall girder apparatus that existing bridge according to claim 1 is added, it is characterised in that lower girder falling with Upper anti-fall girder construction is identical, and opposite steel strand wires connector (6) setting symmetrical above and below, and girder falling includes pedestal (4) and bracket (5), the pedestal (4) is fixed on bent cap (3), on box beam crossbeam (1) by bar planting screw rod (2) and bar planting nut (13), pedestal (4) with bent cap (3), box beam crossbeam (1) contact surface fill concrete；Bracket (5) welding setting is held in the palm on the outside of pedestal (4) The above and below of seat (5) is equipped with for wearing the mounting hole (503) for penetrating steel strand wires connector (6).

3. the antidumping anti-fall girder apparatus that existing bridge according to claim 1 is added, it is characterised in that pedestal (4) includes Vertical steel plate (401) and the connecting plate (402) being arranged between vertical steel plate (401) and girder falling, vertical steel plate (401) pass through Bar planting screw rod (2) and bar planting nut (13) are fixed on bent cap (3), on box beam crossbeam (1), connecting plate (402) and vertical steel plate (401) it is welded to connect, is formed between vertical steel plate (401), connecting plate (402) and bent cap (3) or the contact surface of box beam crossbeam (1) Cavity in fill concrete.

4. the antidumping anti-fall girder apparatus that existing bridge according to claim 3 is added, it is characterised in that connecting plate (402) For square structure or angular structure.

5. the antidumping anti-fall girder apparatus that existing bridge according to claim 3 is added, it is characterised in that bracket (5) is served as reasons Steel plate is welded to connect the cube structure to be formed, and is welded to connect with vertical steel plate (401), upper steel plate (501), the lower steel of cube Plate (502) is correspondingly provided with for wearing the mounting hole (503) for penetrating steel strand wires connector (6), between upper steel plate (501) and spring (9) Equipped with cushion (8).

6. the antidumping anti-fall girder apparatus that existing bridge according to claim 5 is added, it is characterised in that cube it is upper Two pieces of fixing steel plates (504) are equipped on the inside of steel plate (501), fixing steel plate (504) is located at the two sides of mounting hole (503), and two pieces fixed Deflector (7) are equipped with by bolt between position steel plate (504), deflector (7) is spliced by two blocks of wedge-shaped wood.

7. the antidumping anti-fall girder apparatus that -6 any existing bridges are added according to claim 1, it is characterised in that steel twists Wire connections (6) include steel strand wires (602), are arranged on steel strand wires (602) PE housing (603), and steel strand wires (602) both ends are equipped with anchor Gu covering (601), fixture nut (11) is connected on anchoring cartridge (601).