CN106436591B - A kind of steel cantilever combined bridge deck widens reconstruction structure and its construction method - Google Patents
A kind of steel cantilever combined bridge deck widens reconstruction structure and its construction method Download PDFInfo
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- CN106436591B CN106436591B CN201610978457.9A CN201610978457A CN106436591B CN 106436591 B CN106436591 B CN 106436591B CN 201610978457 A CN201610978457 A CN 201610978457A CN 106436591 B CN106436591 B CN 106436591B
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling 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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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Abstract
The invention discloses a kind of steel cantilever combined bridge decks to widen reconstruction structure and its construction method, for solving the problems, such as that traditional box beam is widened and existed.Wherein, including former box beam and it is symmetricly set on the widened sections of former box beam both sides, which is characterized in that in the widened section include steel cantilever, steel bed die, steel guard rail and casting concrete, wherein the steel cantilever is the welding steel member of triangle open web type structure；The steel cantilever is connect by anchor bolt with former box beam, and the steel bed die is fixed on steel cantilever, and casting concrete is arranged in steel bed die and forms effective PBL key connections.Former box-beam structure is fully used, and structure secondary dead load increases less (only increasing by 10% or so than original structure), therefore can directly utilize the lower parts Yuan Qiao and basis, significantly reduces improvement project amount.
Description
Technical field
The invention belongs to construction engineering technical field, it is related to the design of the bridge widening in science of bridge building, more particularly to
The Widening Design of pier stud is not increased to old concrete box-beam bridge.
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 becomes the upgrading of existing highway especially node interchange the new hot spot in highway engineering field.Wherein, how
It realizes the transformation of widening to cast-in-situ box girder structure, improves transformation efficiency, reduce improvement cost, ensure that structure becomes safely structure work
The emphasis and focus of Cheng Shi concerns.
The method that some bridge widening examples mostly use both at home and abroad at present is to increase bridge pier in former bridge unilateral side or both sides, is leaned on
Newly-increased bridge pier directly supports the bridge floor widened, the scheme announced in 204608619 U of referenced patent CN, scheme, bridge pier
Both sides are respectively equipped with newly-built left side bridge pier and right side bridge pier, the prefabricated longeron of left and right side are each provided 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 arranged
I, for implantation 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 are pre-
Longeron top surface processed is each provided with the concrete pavement layer for pouring coagulation forming.
In said program, 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 since new and old structure becomes caused by many reasons
Shape is uncoordinated so that and it is previous to widen the shortcomings that technology is easy to cracking there are widened section girder with former girder longitudinal seam, and
And (across road construction) larger to traffic impact under bridge in work progress, 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 is to increase orthotropic steel bridge deck in the both sides of original concrete box girder, and pass through transverse
The new steel beam structure that sets is linked to be entirety by steel beam with original beams of concrete.During increasing orthotropic steel bridge deck, need
Fluting can generate original box beam larger destruction, reduce the integral strength of bridge for installing gooseneck in original box beam.
In addition long construction period.
Invention content
In order to solve the deficiencies in the prior art, the present invention provide a kind of steel cantilever combined bridge deck widen reconstruction structure and its
Construction method solves the problems, such as that traditional box beam is widened and existed.
The technical solution adopted by the present invention to solve the technical problems is：
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, which is characterized in that in the widened section include steel cantilever, steel bed die, steel guard rail and casting concrete, wherein
The steel cantilever is the welding steel member of triangle open web type structure；The steel cantilever is outstanding by anchor bolt and former box beam
Arm lower edge is connected with web outside face lower part,
The steel bed die being fixed on steel cantilever is made of bottom steel plate, longitudinal stiffener and side outer baffle, institute
It states longitudinal stiffener and side outer baffle is fixed on the steel plate of bottom, and trepanning is set on the longitudinal stiffener, the trepanning
Notch is reserved on a diameter of three times floorings transverse steel diameter, the trepanning top；In steel bed die setting casting concrete and shape
It is keyed at effective PBL；
The guardrail is mounted 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 spacing, which is arranged, in adjacent steel cantilever.
The anchor bolt diameter of phi 16, is arranged symmetrically, and horizontal spacing is not preferably less than 20cm.
The steel cantilever is the hollow steel plate for 10mm, web outer edge outsourcing width 200mm, thickness by the thickness of load-bearing
The stiffener of 10mm, inward flange outsourcing width 100mm, thickness 10mm stiffener weld to be formed；The steel cantilever and former box beam
Web contact surface uses thickness 20mm, the steel plate of width 200mm.
Steel cantilever combined bridge deck widens rebuilding construction method, which is characterized in that sequence carries out according to the following steps：
The first step, the cutting disassembling of former box beam both sides cantilever
Former box beam guardrails of both sides region is cut and disassembled, 50 centimetres are respectively cut in both sides, cutting is the cutting to concrete,
Retain the original reinforcing bar being laterally arranged in floorings, location of cut original floorings alien invasion carries out cleaning and dabbing disposition；
Second step, the fixed installation of steel cantilever
Along bridge to fixed steel cantilever, the steel cantilever are anchored using anchor bolt at equal intervals, ensure that steel cantilever connects with former box beam
It is bonded between contacting surface；
Third walks, and is laid with steel bed die, arranges widened section floorings reinforcing bar
Steel bed die is laid on steel cantilever, and former bridge transverse steel is penetrated in the trepanning of steel bed die, to steel cantilever and
Steel bed die carries out anticorrosive coating；
4th step pours widened section bridge deck concrete
Effective PBL key connections are formed on steel bed die after casting concrete solidification；
5th step, steel guard rail installation.
Further include a process that applying mortar leveling is carried out to former box beam contact surface in step 2, maximum leveling is thick
Degree should not exceed 1cm, strength classes of mortar M15.
The steel guard rail meets anti-collision level and meets SS grades of requirements.
Steel cantilever combined bridge deck widens rebuilding construction method, which is characterized in that sequence carries out according to the following steps：First
Step, the cutting disassembling of former box beam both sides cantilever
Former box beam guardrails of both sides region is cut and disassembled, 50 centimetres are respectively cut in both sides, cutting is the cutting to concrete,
Retain the original reinforcing bar being laterally arranged in floorings, location of cut original floorings alien invasion should carry out cleaning and dabbing disposition；
Second step, the fixed installation of steel cantilever
Steel bed die and steel cantilever are transported after factory's welding fabrication to live whole segmental hoisting, along bridge to equidistantly
Fixation steel cantilever, the steel cantilever anchored using anchor bolt, ensures to be bonded between steel cantilever and former box beam contact surface；
Third walks, and arranges widened section floorings reinforcing bar
Former bridge transverse steel is penetrated in the trepanning of steel bed die, anticorrosive coating is carried out to steel cantilever and steel bed die；
4th step pours widened section bridge deck concrete
Casting concrete and effective PBL key connection is formed at this on steel bed die；
5th step, steel guard rail installation.
The beneficial effects of the invention are as follows：
(1) former box-beam structure is fully used, and structure secondary dead load increases less (only more left than original structure increase by 10%
It is right), therefore the lower parts Yuan Qiao and basis can be directly utilized, significantly reduce improvement project amount.
(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 to carry out widening transformation to box beam, is not directed to the construction of basis and substructure, therefore does not need
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 is in economy, the feature of environmental protection etc. with apparent advantage.
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 cross-section diagrams in Fig. 4.
Fig. 6 is D-D cross-section diagrams in Fig. 4.
Fig. 7 is steel cantilever (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 lower parts, 2 steel cantilevers, 3
Anchor bolt, 4 steel bed dies, 41 trepannings, 42 bottom steel plates, 43 longitudinal stiffeners, 44 side outer baffles, 5 casting concretes, 6 steel guard rails.
Specific implementation mode
A kind of steel cantilever combined bridge deck widens the scheme of transformation box beam：Retain and utilizes former box beam main part, excision
Both sides cantilever end (containing former bridge protective railings), using open web type steel cantilever as Auxiliary support, is connect using combined bridge deck on it
Long original 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 the box beam ability of widening certain limitation, meanwhile,
Need rationally to determine former box girder cantilever cutting position, steel cantilever along bridge to parameters, the combined bridge deck such as arrangement spacing be considered as
Property easy for construction, and it is considered as influence etc. of the concrete shrinkage and creep to structure.
Rebuilding construction process is as follows：
The first step, the cutting disassembling of former box girder cantilever
1 guardrails of both sides region of former box beam is cut and disassembled, respectively cuts 50 centimetres in both sides, with reference to figure 2, cutting is to coagulation
The cutting of soil retains the original reinforcing bar being laterally arranged 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, former box beam guardrails of both sides region (each 50cm in both sides) is cut and disassembled for selection, i.e., former bridge
It is 7.5m that floorings, which retain peak width,.The position is selected mainly to consider following reason as cutting position：1. work is cut and disassembled
Journey amount is small, convenient for construction；2. former bridge floor reservation region covers substantially widens axle casing runway range, 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 spacing, which is arranged, in adjacent steel cantilever 2, this bridge steel cantilever Anchorage Plan uses mechanical anchor 3
Anchorage Plan, steel cantilever 2 connect with former concrete box girder and are primarily present in two planes：First, under former box beam concrete cantilever
Edge 11, first, former box girder web lateral surface lower part 12.
3 diameter of phi 16 of anchor bolt, is arranged symmetrically, and horizontal spacing is not preferably less than 20cm and (should be noted that evacuation former bridge when actual arrangement
Reinforcing bar in box beam).
To ensure being bonded between steel cantilever 2 and 1 contact surface of former box beam, need to contact former box beam 1 when necessary in installation process
Face carries out applying mortar leveling (maximum leveling thickness should not exceed 1cm), strength classes of mortar M15.
Third walks, and is laid with steel bed die 4, arranges widened section floorings reinforcing bar
This stage can individually carry out being laid with 4 construction of steel bed die, directly steel bed die and steel cantilever can also exist in second step
Whole segmental hoisting after factory's welding fabrication, with reference to figure 7, (can be determined according to practice of construction ability and field condition).
Using the steel plate with longitudinal rib as steel bed die, and (3 times of floorings transverse steels of opening diameter are straight for trepanning in longitudinal rib
The reserved notch of diameter and trepanning top, lays convenient for reinforcement installation), allow former bridge transverse steel to penetrate in trepanning 41.
Carrying out anticorrosive coating to steel member (including steel cantilever and steel bed die), (application scheme should meet related specifications and design
The regulation of file and requirement).
4th step pours widened section bridge deck concrete
This stage casting concrete 5 on steel bed die, the high performance concrete for selecting shrinkage and creep smaller as far as possible pour
Combined bridge deck, to ensure to be formed after casting concrete effective PBL key connections at this.
This staged construction should be noted that the pre-buried/reserved of the affiliated facilities such as guardrail base, bridge floor drain hole.
5th step, steel guard rail 6 are installed
The increase of structure additional load caused by mitigate improvement project as possible, this programme use steel guard rail 6, anticollision etc.
Grade meets SS grades of requirements.Steel guard rail is crossbeam, upright-column combined, and three silent rectangular steel pipe crossbeams are arranged, and combined I-shaped type is disconnected
Face column, it is 2m that spacing, which is arranged, in column.
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 anchor bolt and nut.
2 structure of steel cantilever is introduced below：
To mitigate the dead weight of steel cantilever member, this programme uses triangle open web type structure, the hollow steel plate thickness of load-bearing
For 10mm；The stiffener of web outer edge outsourcing width 200mm, thickness 10mm, inward flange outsourcing width 100mm, thickness 10mm
Stiffener；Thickness 20mm, the steel plate of width 200mm are used with former box girder web contact surface.Each component of steel cantilever is all made of weldering
It connects 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 used in this programme.With reference to figure 7, steel bed die 4
Include mainly 44 three parts of bottom steel plate 42, longitudinal stiffener 43 and side outer baffle.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
The arrangement and spreading of transverse steel, need trepanning 41 in lengthwise stiffening floor.Opening diameter is that 3 times of floorings transverse steels are straight
The reserved notch of diameter and trepanning top, lays convenient for reinforcement installation.
Steel member material uses Q345.
In view of structure stress safety, 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 generally no more than 3m, structure will be increased by crossing great cantilever and removing
It is outer that dead weight 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 be more than
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.Under the pattern for applying transverse prestress, it should be noted that prestressed to lay, answer in advance
The anchorage problem of power.Bridge pier is not added due to widening transformation, structure is laterally in the force modes of great cantilever in general, answers in advance
Power should lean on box beam upper limb to arrange as possible, be bent downwardly and anchored in steel cantilever end；Since anchoring needs, steel cantilever is coped with
Construction carry out local directed complete set.Prestressed strand is considered as anti-corrosion, meets related specifications and design document requirement.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, various changes of the relevant technical staff in the field to the present invention
Shape and improvement should all expand in the protection domain as determined by claims of the present invention.
Claims (4)
- It is based on steel cantilever combined bridge deck widens reconstruction structure 1. steel cantilever combined bridge deck widens rebuilding construction method It is carried out, steel cantilever combined bridge deck widens reconstruction structure and includes former box beam and be symmetricly set on the those widened sections of former box beam both sides Point, include steel cantilever, steel bed die, steel guard rail and casting concrete in the widened section, wherein the steel cantilever is triangle The welding steel member of open web type structure；The steel cantilever is connected by anchor bolt and former box girder cantilever lower edge and web outside face lower part It connects, the steel bed die being fixed on steel cantilever is made of bottom steel plate, longitudinal stiffener and side outer baffle, the longitudinal direction Ribbed stiffener and side outer baffle are fixed on the steel plate of bottom, and trepanning is arranged on the longitudinal stiffener, and the opening diameter is Notch is reserved on three times floorings transverse steel diameter, the trepanning top；Casting concrete is set in steel bed die and is formed effective PBL key connection；The guardrail is mounted on the edge of widened section, which is characterized in that sequence carries out according to the following steps：First Step, the cutting disassembling of former box beam both sides cantileverFormer box beam (1) guardrails of both sides region is cut and disassembled, 50 centimetres are respectively cut in both sides, cutting is the cutting to concrete, Retain the original reinforcing bar being laterally arranged in floorings, location of cut original floorings alien invasion carries out cleaning and dabbing disposition；Second step, the fixed installation of steel cantilever (2)Along bridge to equidistant fixed steel cantilever (2), the steel cantilever is anchored using anchor bolt (3), ensures steel cantilever (2) and original It is bonded between box beam (1) contact surface；Third walks, and is laid with steel bed die (4), and steel bed die (4) is laid on steel cantilever by arrangement widened section floorings reinforcing bar, and will be former Bridge transverse steel penetrates in the trepanning (41) of steel bed die, and anticorrosive coating is carried out to steel cantilever and steel bed die；4th step pours widened section bridge deck concreteEffective PBL key connections are formed on steel bed die after casting concrete (5) solidification；5th step, steel guard rail (6) installation.
- 2. steel cantilever combined bridge deck according to claim 1 widens rebuilding construction method, which is characterized in that in step 2 In, further include a process that applying mortar leveling is carried out to former box beam (1) contact surface, maximum leveling thickness should not exceed 1cm, Strength classes of mortar is M15.
- 3. steel cantilever combined bridge deck according to claim 1 widens rebuilding construction method, which is characterized in that the steel shield Column (6) meets anti-collision level and meets SS grades of requirements.
- It is based on steel cantilever combined bridge deck widens reconstruction structure 4. steel cantilever combined bridge deck widens rebuilding construction method It is carried out, steel cantilever combined bridge deck widens reconstruction structure and includes former box beam and be symmetricly set on the those widened sections of former box beam both sides Point, include steel cantilever, steel bed die, steel guard rail and casting concrete in the widened section, wherein the steel cantilever is triangle The welding steel member of open web type structure；The steel cantilever is connected by anchor bolt and former box girder cantilever lower edge and web outside face lower part It connects, the steel bed die being fixed on steel cantilever is made of bottom steel plate, longitudinal stiffener and side outer baffle, the longitudinal direction Ribbed stiffener and side outer baffle are fixed on the steel plate of bottom, and trepanning is arranged on the longitudinal stiffener, and the opening diameter is Notch is reserved on three times floorings transverse steel diameter, the trepanning top；Casting concrete is set in steel bed die and is formed effective PBL key connection；The guardrail is mounted on the edge of widened section, which is characterized in that sequence carries out according to the following steps：First Step, the cutting disassembling of former box beam both sides cantileverFormer box beam (1) guardrails of both sides region is cut and disassembled, 50 centimetres are respectively cut in both sides, cutting is the cutting to concrete, Retain the original reinforcing bar being laterally arranged in floorings, location of cut original floorings alien invasion should carry out cleaning and dabbing disposition；Second step, the fixed installation of steel cantilever (2)Steel bed die and steel cantilever are transported after factory's welding fabrication to live whole segmental hoisting, along bridge at equal intervals admittedly Determine steel cantilever (2), the steel cantilever is anchored using anchor bolt (3), ensures to be bonded between steel cantilever (2) and former box beam (1) contact surface；Third walks, and arranges widened section floorings reinforcing barFormer bridge transverse steel is penetrated in the trepanning (41) of steel bed die, anticorrosive coating is carried out to steel cantilever and steel bed die；4th step pours widened section bridge deck concreteCasting concrete (5) and effective PBL key connection is formed at this on steel bed die；5th step, steel guard rail (6) installation.
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| CN107700371A (en) * | 2017-10-20 | 2018-02-16 | 吴迪 | A kind of small rural highway bridge transforms reinforcement means |
| CN107869113A (en) * | 2017-10-31 | 2018-04-03 | 南京林业大学 | A kind of box beam that strengthens is encorbelmented the method for flange structural rigidity |
| CN109356045A (en) * | 2018-10-30 | 2019-02-19 | 中铁第四勘察设计院集团有限公司 | A kind of prefabricated box culvert structure that top is widened |
| CN112813800B (en) * | 2021-03-09 | 2024-06-25 | 上海市城市建设设计研究总院（集团）有限公司 | Replacement connection structure of integral anti-collision wall with side plates of elevated road and construction method of replacement connection structure |
| CN113430959A (en) * | 2021-08-04 | 2021-09-24 | 刘澜涛 | Construction method for prolonging radial width of expressway bridge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH086291B2 (en) * | 1991-03-19 | 1996-01-24 | 川崎製鉄株式会社 | Widening method of road bridge |
| CN201172796Y (en) * | 2008-04-03 | 2008-12-31 | 长安大学 | Steel box girder bridge deck structure with upper longitudinal ribs |
| CN101298756A (en) * | 2008-06-19 | 2008-11-05 | 大连理工大学 | Technique for widening concrete box girder without increasing foot stall steel component |
| CN101613997B (en) * | 2009-07-21 | 2011-02-16 | 清华大学 | Method for widening steel-concrete combination |
| KR101203724B1 (en) * | 2010-07-01 | 2012-11-23 | (주)지아이에프 | The Construction methods for the cantilever slab using half precast panels |
| CN203684115U (en) * | 2014-01-24 | 2014-07-02 | 大连理工大学 | Concrete box girder with widened thin wall |
| CN205529906U (en) * | 2016-04-08 | 2016-08-31 | 同济大学 | Take semi -closed trough perforated plate's quadrature opposite sex combination bridge panel |
| CN206655141U (en) * | 2016-11-04 | 2017-11-21 | 孟涛 | A kind of steel cantilever combined bridge deck widens reconstruction structure |
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