CN206655141U - A kind of steel cantilever combined bridge deck widens reconstruction structure - Google Patents

A kind of steel cantilever combined bridge deck widens reconstruction structure Download PDF

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CN206655141U
CN206655141U CN201621202257.6U CN201621202257U CN206655141U CN 206655141 U CN206655141 U CN 206655141U CN 201621202257 U CN201621202257 U CN 201621202257U CN 206655141 U CN206655141 U CN 206655141U
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steel
cantilever
steel cantilever
reconstruction
widens
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孟涛
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孟涛
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Abstract

The utility model discloses a kind of steel cantilever combined bridge deck to widen reconstruction structure, for solving the problems, such as that traditional box beam is widened and existed.Wherein, including former box beam and be symmetricly set on the widened sections of former box beam both sides, it is characterised in that include steel cantilever, steel bed die, steel guard rail and casting concrete in the widened section, wherein, the steel cantilever for triangle open web type structure welding steel member;The steel cantilever is connected by crab-bolt with former box beam, and the steel bed die is fixed on steel cantilever, is set casting concrete in steel bed die and is formed effective PBL key connections.Former box-beam structure is fully used, and the increase of structure secondary dead load is less (only than original structure increase by 10% or so), therefore can significantly reduce improvement project amount directly using Yuan Qiao bottoms and basis.

Description

A kind of steel cantilever combined bridge deck widens reconstruction structure
Technical field
The utility model belongs to construction engineering technical field, is related to the design of the bridge widening in science of bridge building, especially It is related to the Widening Design that old concrete box-beam bridge does not increase pier stud.
Background technology
Perfect, flourishing highway transportation network is the inevitable requirement of socio-economic development, with the hair at full speed of national economy Exhibition, the new focus in highway engineering field is turned into the upgrading of existing highway particularly node interchange.Wherein, how The transformation of widening to cast-in-situ box girder structure is realized, transformation efficiency is improved, reduces improvement cost, ensures that structure turns into structure work safely The emphasis and focus of Cheng Shi concerns.
The method that some bridge widening examples use more both at home and abroad at present is in former bridge one side or both sides increase bridge pier, is leaned on Newly-increased bridge pier directly supports the bridge floor widened, the scheme announced in the U of referenced patent CN 204608619, its scheme, bridge pier Both sides are respectively equipped with newly-built left side bridge pier and right side bridge pier, are each provided with the prefabricated longeron of left and right side on left and right side bridge pier, in advance The across footpath of longeron processed and existing bridge main beam is isometric, and the right side edge of a wing of the prefabricated longeron in left side is provided with embedded bar I, and right side is prefabricated The left side edge of a wing of longeron is provided with embedded bar II, the implantation reinforcing bar that the arranged on left and right sides flange plate of existing bridge main beam is respectively set I, be implanted into reinforcing bar II respectively with embedded bar I, embedded bar II electric welding connections, existing girder and the prefabricated longeron in left side, right side Prefabricated longeron top surface is each provided with pouring the concrete pavement layer of coagulation forming.
In such scheme, newly-increased structure is smaller to the stressing influence of former bridge structure, and this method is in force analysis and structure It is all fairly simple to make processing aspect, but there is also some problems:In configuration aspects because new and old structure becomes caused by many reasons Shape is uncoordinated so that and the shortcomings that widened section girder is easy to cracking with former girder longitudinal seam be present in conventional technology of widening, and It is and larger to traffic impact under bridge in work progress(Across road construction), and newly-increased occupation of land is needed, foundation excavation quantities is big.
Alternatively construction method, CN101298756, which is disclosed, a kind of not to be increased foot stall steel component and widens concrete The technology of box beam, it is to increase orthotropic steel bridge deck in the both sides of original concrete box girder, and passes through transverse The new steel beam structure that sets is linked to be entirety by steel beam with original beams of concrete.During orthotropic steel bridge deck is increased, it is necessary to Slotted in original box beam for installing gooseneck, larger destruction can be produced to original box beam, reduce the bulk strength of bridge. Other long construction period.
Utility model content
In order to solve the deficiencies in the prior art, the utility model provides a kind of steel cantilever combined bridge deck and widens reconstruction structure And its construction method, solve the problems, such as that traditional box beam is widened and existed.
Technical scheme is used by the utility model solves its technical problem:
A kind of steel cantilever combined bridge deck widens reconstruction structure, including former box beam and be symmetricly set on former box beam both sides plus Wide portion, it is characterised in that include steel cantilever, steel bed die, steel guard rail and casting concrete in the widened section, wherein,
The steel cantilever is the welding steel member of triangle open web type structure;The steel cantilever is hanged by crab-bolt and former box beam Arm lower edge connects with web outside face bottom,
The steel bed die being fixed on steel cantilever is made up of bottom steel plate, longitudinal stiffener and side outer baffle, institute State longitudinal reinforced rib and side outer baffle is fixed on the steel plate of bottom, and perforate is set on the longitudinal stiffener, the perforate Notch is reserved on a diameter of three times floorings transverse steel diameter, the perforate top;In steel bed die, casting concrete and shape are set Into effective PBL key connections;
The guardrail is arranged on the edge of widened section.
The bottom steel plate width 1375mm, the longitudinal stiffener are six, the high 50mm of rib;Side outer baffle height 210mm。
Along bridge to it is 2m that adjacent steel cantilever, which sets spacing,.
The crab-bolt diameter of phi 16, is arranged symmetrically, and horizontal spacing is not preferably less than 20cm.
It by the hollow steel plate thickness of load-bearing is 10mm that the steel cantilever, which is, web outward flange outsourcing width 200mm, thickness 10mm stiffener, inward flange outsourcing width 100mm, thickness 10mm plate weld of putting more energy into are formed;The steel cantilever and former box beam Web contact surface uses thickness 20mm, width 200mm steel plate.
The beneficial effects of the utility model are:
(1)Former box-beam structure is fully used, and the increase of structure secondary dead load is less(It is only more left than original structure increase by 10% It is right), therefore improvement project amount can be significantly reduced directly using Yuan Qiao bottoms and basis.
(2)Due to being that both sides are symmetrically widened in former box beam, former bridge is flat, ordinate shape does not change substantially, to former ring road The influence of technical indicator can almost be ignored.
(3)This programme only needs that box beam is carried out to widen transformation, is not directed to the construction of basis and substructure, therefore need not It is newly-increased to take up an area.
(4)Factorial construction can be achieved in steel cantilever and combined bridge deck plate bed die, and reliable in quality, duration are controllable.
(5)This programme can realize precast assembly construct, on ring road across it is small by cross-channel Coherent traffic noise.
(6)With traditional modification scheme ratio, this programme has obvious advantage in economy, the feature of environmental protection etc..
Brief description of the drawings
Fig. 1 is former bridge standard cross-section figure.
Fig. 2 is former bridge cutting position schematic diagram.
Fig. 3 is that box beam widens floor plan.
Fig. 4 is that box beam widens facade layout drawing.
Fig. 5 is C-C sectional drawings in Fig. 4.
Fig. 6 is D-D sectional drawings in Fig. 4.
Fig. 7 is steel cantilever(The bed die of slab containing combined bridge deck)Stereogram.
Fig. 8 is steel cantilever design sketch.
Fig. 9 is finished section figure.
In figure:1 former box beam, 11 former box beam concrete cantilever lower edges, 12 former box girder web lateral surface bottoms, 2 steel cantilevers, 3 Crab-bolt, 4 steel bed dies, 41 perforates, 42 bottom steel plates, 43 longitudinal stiffeners, 44 side outer baffles, 5 casting concretes, 6 steel guard rails.
Embodiment
A kind of steel cantilever combined bridge deck widens the scheme of transformation box beam:Retain and utilize former box beam main part, excision Both sides cantilever end(Containing former bridge protective railings), using open web type steel cantilever as Auxiliary support, connect thereon using combined bridge deck Long former cantilever is to designing width, while former bridge concrete anti-collision guard bar is changed to steel guard rail.
Widening transformation box beam using steel cantilever combined bridge deck needs certain limitation to the box beam ability of widening, meanwhile, Need rationally to determine former box girder cantilever cutting position, steel cantilever along bridge to parameter, the combined bridge deck such as arrangement spacing be considered as Property easy for construction, and it is considered as the influence of concrete shrinkage and creep to structure etc..
Rebuilding construction process is as follows:
The first step, the cutting disassembling of former box girder cantilever
The former guardrails of both sides region of box beam 1 is cut and disassembled, respectively cuts 50 centimetres in both sides, with reference to figure 2, cutting is to coagulation The cutting of soil, retain the original reinforcing bar laterally set in floorings.Location of cut original floorings alien invasion should carry out cleaning and Dabbing dispose, in order to and young concrete combination.
Widen for ease of floorings, select former box beam guardrails of both sides region(Each 50cm in both sides)Cutting disassembling, i.e., former bridge Floorings reservation region width is 7.5m.The position is selected mainly to consider following reason as cutting position:1. work is cut and disassembled Journey amount is small, is easy to construct;2. former bridge floor reservation region covers substantially widens axle casing runway scope, ensure the main stress of structure The integrality at position.
Second step, the fixed installation of steel cantilever 2
Along bridge to it is 2m that adjacent steel cantilever 2, which sets spacing, and this bridge steel cantilever Anchorage Plan employs mechanical anchor 3 Anchorage Plan, steel cantilever 2 is connected with former concrete box girder to be primarily present in two planes:First, under former box beam concrete cantilever Edge 11, first, former box girder web lateral surface bottom 12.
The diameter of phi 16 of crab-bolt 3, is arranged symmetrically, and horizontal spacing is not preferably less than 20cm(It should be noted that during actual arrangement and avoid former bridge Reinforcing bar in box beam).
To ensure steel cantilever 2 and being bonded between the former contact surface of box beam 1, need to contact former box beam 1 if necessary in installation process Face carries out applying mortar leveling(Maximum leveling thickness not should be greater than 1cm), strength classes of mortar M15.
3rd step, laying steel bed die 4, arranges widened section floorings reinforcing bar
This stage can individually carry out laying steel bed die 4 and construct, and directly steel bed die and steel cantilever can also exist in second step Overall segmental hoisting after factory's welding fabrication, with reference to figure 7,(It can be determined according to practice of construction ability and field condition).
By the use of the steel plate with longitudinal rib as steel bed die, and the perforate in longitudinal rib(3 times of floorings transverse steels of opening diameter are straight The reserved notch in footpath and perforate top, is easy to reinforcement installation to lay), allow former bridge transverse steel to penetrate in perforate 41.
To steel member(Including steel cantilever and steel bed die)Carry out anticorrosive coating(Application scheme should meet related specifications and design The regulation of file and requirement).
4th step, pour widened section bridge deck concrete
This stage casting concrete 5 on steel bed die, the less high performance concrete of shrinkage and creep is selected to pour as far as possible Combined bridge deck, so as to which effective PBL key connections can be formed in this place after ensureing casting concrete.
This staged construction should be noted that the pre-buried/reserved of the affiliated facilities such as guardrail base, bridge floor spilled water hole.
5th step, steel guard rail 6 are installed
The increase of structure additional load, this programme employ steel guard rail 6, anticollision etc. caused by mitigate improvement project as far as possible Level meets the requirement of SS levels.Steel guard rail is crossbeam, upright-column combined, sets three to remain silent rectangular steel pipe crossbeam, and combined I-shaped type breaks Face column, it is 2m that column, which sets spacing,.
Steel guard rail upright post base steel plate upright post base anchor bolts pre-buried when being poured with floorings are fixed.
Protective coating is carried out to guardrail steel member, the fixed exposed component such as crab-bolt and nut.
The structure of steel cantilever 2 is introduced below:
To mitigate the deadweight of steel cantilever member, this programme employs triangle open web type structure, the hollow steel plate thickness of load-bearing For 10mm;Web outward flange outsourcing width 200mm, thickness 10mm stiffener, inward flange outsourcing width 100mm, thickness 10mm Stiffener;Thickness 20mm, width 200mm steel plate are used with former box girder web contact surface.Each component of steel cantilever is using weldering Connect in succession.
Steel member material uses Q345.
Steel bed die 4 is introduced below:
For ease of the concrete pouring construction of combined bridge deck, steel bed die is employed in this programme.With reference to figure 7, steel bed die 4 Mainly include bottom steel plate 42, longitudinal stiffener 43 and the three parts of side outer baffle 44.This programme midsole steel plate width 1375mm, on Face is provided with 6 ribbed stiffeners, the high 50mm of rib;Outside height of baffle plate 210mm.Steel plate thickness is 6mm.For ease of in former floorings Arrangement and the spreading of transverse steel, it is necessary in lengthwise stiffening floor perforate 41.Opening diameter is that 3 times of floorings transverse steels are straight The reserved notch in footpath and perforate top, is easy to reinforcement installation to lay.
Steel member material uses Q345.
In view of structure stress security, the width for widening box beam using steel cantilever combined bridge deck should be by certain limit System, in the case where not applying transverse prestress, for maximum cantilever width typically no more than 3m, structure will be increased by crossing great cantilever and removing It is outer that deadweight causes box-beam structure bearing capacity to transfinite, and newly-increased cantilever design and the requirement of the connection anchoring of former concrete box girder will exceed The acceptable degree of practical structures.
Certainly, apply transverse prestress while according to steel cantilever, due to changing the lateral stressed pattern in section, then may be used Width is used with larger extension steel cantilever.In the case where applying the pattern of transverse prestress, it should be noted that prestressed to lay, in advance The anchorage problem of power.Bridge pier is not set up due to widening transformation, structure is laterally in the force modes of great cantilever in general, in advance should Power, which should try one's best, leans on box beam upper limb to arrange, is bent downwardly and is anchored in steel cantilever end;Because anchoring needs, steel cantilever is tackled Construction carry out local directed complete set.Prestressed strand is considered as anti-corrosion, meets related specifications and design document requirement.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality New scope is defined, and on the premise of the utility model design spirit is not departed from, relevant technical staff in the field is to this The various modifications of utility model and improvement, it all should expand as determined by the utility model claims book in protection domain.

Claims (5)

1. a kind of steel cantilever combined bridge deck widens reconstruction structure, including former box beam (1) and it is symmetricly set on former box beam both sides Widened section, it is characterised in that include steel cantilever, steel bed die, steel guard rail and casting concrete in the widened section, wherein,
The steel cantilever is the welding steel member of triangle open web type structure;The steel cantilever is hanged by crab-bolt (3) with former box beam Arm lower edge (11) and web outside face bottom (12) connection,
The steel bed die being fixed on steel cantilever is by bottom steel plate (42), longitudinal stiffener (43) and side outer baffle (44) group Into, the longitudinal reinforced rib (32) and side outer baffle (44) are fixed on the steel plate of bottom, and are set on the longitudinal stiffener Perforate (41) is put, a diameter of three times floorings transverse steel diameter of perforate (41), notch is reserved on the perforate top;In steel Bed die sets casting concrete (5) and forms effective PBL key connections;
The guardrail is arranged on the edge of widened section.
2. a kind of steel cantilever combined bridge deck according to claim 1 widens reconstruction structure, it is characterised in that the bottom steel Plate width 1375mm, the longitudinal stiffener are six, the high 50mm of rib;Side outer baffle height 210mm.
3. a kind of steel cantilever combined bridge deck according to claim 1 widens reconstruction structure, it is characterised in that along bridge to, It is 2m that adjacent steel cantilever (2), which sets spacing,.
4. a kind of steel cantilever combined bridge deck according to claim 1 widens reconstruction structure, it is characterised in that the crab-bolt (3) diameter of phi 16, it is arranged symmetrically, horizontal spacing is not preferably less than 20cm.
5. a kind of steel cantilever combined bridge deck according to claim 1 widens reconstruction structure, it is characterised in that the steel hangs It by the hollow steel plate thickness of load-bearing is 10mm that arm, which is, web outward flange outsourcing width 200mm, thickness 10mm stiffener, inner edge Edge outsourcing width 100mm, thickness 10mm plate weld of putting more energy into are formed;The steel cantilever uses thickness with former box girder web contact surface 20mm, width 200mm steel plate.
CN201621202257.6U 2016-11-04 2016-11-04 A kind of steel cantilever combined bridge deck widens reconstruction structure Active CN206655141U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106436591A (en) * 2016-11-04 2017-02-22 孟庆华 Steel cantilever combined bridge deck slab widening and reconstruction structure and construction method thereof
CN109706844A (en) * 2019-02-14 2019-05-03 中设工程咨询(重庆)股份有限公司 Interchange ramp bridge widens method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106436591A (en) * 2016-11-04 2017-02-22 孟庆华 Steel cantilever combined bridge deck slab widening and reconstruction structure and construction method thereof
CN109706844A (en) * 2019-02-14 2019-05-03 中设工程咨询(重庆)股份有限公司 Interchange ramp bridge widens method

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