CN107100092B - A kind of quick bridge widening structure and installation method of uninterrupted traffic - Google Patents
A kind of quick bridge widening structure and installation method of uninterrupted traffic Download PDFInfo
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- CN107100092B CN107100092B CN201710360368.2A CN201710360368A CN107100092B CN 107100092 B CN107100092 B CN 107100092B CN 201710360368 A CN201710360368 A CN 201710360368A CN 107100092 B CN107100092 B CN 107100092B
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- bracket
- crossbeam
- diagonal brace
- web member
- bridge
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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
Abstract
The present invention provides a kind of quick bridge widening structures of uninterrupted traffic, it include: crossbeam, bracket, diagonal brace, web member, beam bottom steel plate, stringer, floorings, the bracket is located on the outside of pontic girder web plate, flange plate lower part, it is protruded outward beyond pontic edge of a wing board width, between the bracket and girder, between the bracket and crossbeam, between the bracket and diagonal brace, it is fixed between the diagonal brace and crossbeam；The web member is located between the Liang Yuliang of pontic, and fixes with the web of beam, intersects web member and fixes in crosspoint；The beam bottom steel plate is fixedly connected with beam bottom；The stringer is located on crossbeam, fixed floorings above longitudinal and cross beam.Bridge widening structure provided by the invention reduces the substructure of newly building bridge, the problems such as modified difference generates cracking to Effect on Mechanical Properties, the connecting portion concrete of connection armored concrete between new and old bridge is avoided, solves the problems such as work progress need to interrupt existing traffic.
Description
Technical field
The present invention relates to road and bridge engineering technical fields, more particularly, to a kind of quick bridge widening structure of uninterrupted traffic
And installation method, it is big suitable for the volume of traffic and be difficult to suspend traffic and be not suitable for increase the bridge of substructure.
Background technique
Currently, urban road scale constantly expands with the high speed development of social economy, quite a few early stage construction
Not the problems such as bridge technology situation does not adapt to new trip demand, and generally existing communication function is weak, and the traffic capacity is low,
" bottleneck " is formed in urban road network, the unimpeded of urban transportation has been seriously affected, has become traffic jam point and traffic accident is multiple
Place.In conjunction with urban infrastructure construction, urgent need undergoes technological transformation to it, rationally utilizes, to meet and adapt to new traffic
Development need.
In bridge Reconstruction Project, bridge widening technology is complicated, enforcement difficulty is high, big, Yi Jiru is influenced on Modern Traffic
What guarantees to widen the good operative performance of rear axle girder construction entirety.For such problem, need using a kind of economical rationality and fast
The bridge widening structure of speed.Steel construction is set in original beam bottom, setting steel truss connects at cantilever, adds transverse direction between Liang Yuliang
Diagonal brace, lateral diagonal brace connect the rigidity for improving cantilever with steel truss, can not only quickly carry out bridge widening in this way, and do not influence
It passes through on bridge and under bridge, also reduces newly building bridge substructure, make full use of the bearing capacity of existing highway bridge.
In recent years, bridge Reconstruction Project is fast-developing, extensive application of the structural steelwork in bridge structure, therefore,
Widening and improving is carried out to existing highway bridge by using steel construction, on the one hand reduces newly building bridge substructure, can quickly apply
Work；On the other hand uninterrupted traffic is gone back.So far, there is not yet the structure to be directly applied to the report of bridge widening.
Currently, common bridge widening mode is, superstructure and substructure are created in the one or both sides Yuan Qiao, is created
Bridge superstructure connects with former bridging, and substructure is separated with former bridge, and this mode project amount is big, while top and the bottom structure is applied
Work, can also on bridge cut-off or traffic under bridge, and newly building bridge and original Bridge Foundation separate, and differential settlement will lead to coupling part
Deformation or cracking.
Summary of the invention
In order to solve modified difference between new and old bridge existing in the prior art to the mechanical property of connection armored concrete
The problems such as the problems such as influence, connecting portion concrete generate cracking and work progress interrupt existing traffic, the present invention provides
A kind of quick bridge widening structure of uninterrupted traffic, comprising:
Crossbeam, bracket, diagonal brace, web member, beam bottom steel plate, stringer, floorings, in which:
The bracket is located on the outside of pontic girder web plate, and flange plate lower part protrudes outward, institute beyond pontic edge of a wing board width
It states between bracket and girder, between the bracket and crossbeam, between the bracket and diagonal brace, is carried out between the diagonal brace and crossbeam
It is fixed；The web member is located between the Liang Yuliang of pontic, and fixes with the web of beam, intersects web member and fixes in crosspoint；Institute
Beam bottom steel plate is stated to be fixedly connected with beam bottom；The stringer is located on crossbeam, fixed floorings above longitudinal and cross beam.
Preferably, the bracket is fixedly connected by bar planting with girder, and smearing structure between the bracket and girder
Glue.
Preferably, between the bracket and crossbeam, between the bracket and diagonal brace, pass through weldering between the diagonal brace and crossbeam
Connect fixation.
Preferably, the web member is fastened by the web of anchor bolt and end plate and beam, and it is logical in crosspoint to intersect web member
It crosses and is welded and fixed.
Preferably, the beam bottom steel plate is connect by bar planting with beam bottom, and the smearing structure glue between girder.
Preferably, the crossbeam, bracket, diagonal brace, web member, stringer use channel steel or i-steel component.
The installation method of the quick bridge widening structure of above-mentioned uninterrupted traffic:
(1) preparation: take down the old bridge anticollision barrier, and cuts the part edge of a wing and mat formation；
(2) it drills: being drilled using impact drill in the position of embedded anchor bolt and bar planting, be drilled Kong Houyong compressed air blowout hole
Interior dust, then alcohol or acetone scouring hole inner wall are stained with absorbent cotton；
(3) bar planting: completely infusing anchoring adhesive in hole, and then anchor bolt and bar planting are unidirectionally screwed in；
(4) web member is installed: end plate being inserted in anchor bolt, nut is tightened and fixes, then web member and end plate are welded and fixed；
(5) affixing steel plate: full coat structure glue between beam bottom steel plate and beam contact surface is inserted in bar planting, tightens bolt and fix；
(6) install crossbeam and diagonal brace: bracket, crossbeam and diagonal brace tighten together using being welded to connect, bracket and beam are connect
Full coat structure glue between contacting surface, is inserted in bar planting, tightens bolt and fixes, and bracket bottom is fixed together by welding with beam bottom steel plate；
(7) stringer and floorings are installed.
The present invention widens old bridge using steel truss widened structure, has the advantage that
1, steel truss structure is connect integral with old bridge superstructure, can the new and old common stress of bridge, reduce because of lower part
Structure separates and the sedimentation of generation, deformation.
2, when steel truss is constructed, the influence to former bridge traffic can be reduced to greatest extent, does not interrupt the passage of former bridge,
It only constructs in the side Jiu Qiao and lower part, needs construction space small.
3, steel member can be prefabricated with batch production, and quality guarantee rate is high, eliminates concrete construction formwork supporting plate, ties up reinforcing bar, pours
The links such as build and conserve, easy for construction, speed is fast.
Detailed description of the invention
Fig. 1 is the side view of steel truss widened structure of the present invention.
Fig. 2 is the plan view of widened structure of the present invention.
Fig. 3 is the drawing of affixing steel plate of the present invention.
Fig. 4 is outside diagonal web member Stability Checking Calculation figure.
Description of symbols:
Crossbeam -1, bracket -2, diagonal brace -3, web member -4, end plate -5, anchor bolt -6, beam bottom steel plate -7, bar planting -8, stringer -9,
Floorings -10, old bridge side bar -11, old bridge central sill -12, widened structure-A, Jiu Qiao-B.
Specific embodiment
The present invention will be described below by way of specific embodiments, but the present invention is not limited thereto.
The present invention provides a kind of for widening the steel truss widened structure of old bridge, including crossbeam 1, bracket 2, diagonal brace 3, abdomen
Bar 4, end plate 5, anchor bolt 6, beam bottom steel plate 7, bar planting 8, stringer 9, floorings 10 etc..
Bracket 2 is located at old bridge side bar web outside flange plate lower part, and exceeds the edge of a wing Jiu Qiao board width.Bracket 2 passes through plant
Muscle 8 is connect with beam, and smearing structure glue between bracket 2 and beam, crossbeam 1 is welded and fixed together with bracket 2, diagonal brace 3 and crossbeam 1,
Bracket 2 is by being welded and fixed.
Web member 4 between the old bridge and beam is tightened together by anchor bolt 6, end plate 5 with the web of beam, and two
Passing crosswise between web member is welded and fixed.
The beam bottom steel plate 7 is connect by bar planting 8 with beam bottom, interstitital texture glue between beam bottom steel plate 7 and beam.
The stringer 9 is located on crossbeam, installs floorings on beam in length and breadth.
The fashioned iron such as channel steel, I-steel can be used in the crossbeam 1, bracket 2, diagonal brace 3, web member 4, stringer 9.
Structure Calculation is carried out first:
One, primary structure checks
Due to increasing multiple tracks diaphragm, in order to relatively accurately reflect the stress condition of practical structures, such knot
Structure is reduced to the beam lattice system intersected in length and breadth, solves by the space structure of system of bars.Using the power of widened structure as external load
Load is on former bridge.
1, outside diagonal web member Stability Checking Calculation
Diagonal web member is just to have connect with floorings and web, and when bearing the load of floorings transmitting, diagonal web member itself can be sent out
Compressive deformation and vertical rod are given birth to deformation.Sudden destruction can occur when transversely deforming is larger, that is, de-stabilise destroys.Ginseng
See that Fig. 4, compression bar balance differential equation are as follows:
EI μ "=- N μ-F (l-x)-M (1)
EI μ=∫ ∫ (- N μ-F (l-x)-M) d μ d μ+C μ+D (2)
It solves the differential equation and obtains general solution:
Known boundaries condition: μ=0 x=0；μ=0 x=0.Compressive deformation is disregarded to stable influence in end, is only included in
Compression bar transversely deforming, it can thus be concluded that strut buckling stress condition.
2, bar planting Strength co-mputation
Outer beams and bracket are attached by bar planting in the present invention, and steel plate and concrete component are realized by shear reinforcement
It is common to cooperate.Stress is very multiple in shear connector and its surrounding concrete plate, and connection Ultimate Strength Calculation formula is as follows:
QuIt is ultimate bearing capacity；fcIt is the cubic compressive strength of concrete；f'cIt is concrete cylindrical compression strength；fy
It is the yield strength of reinforcing bar；D is hole diameter；dsIt is the diameter of lateral direction penetrating reinforcing bar；
3, side bar checks
Floorings after widening are made into mutually hinged, the stress of calculating former bridge side bar cantilever root with former bridge flange plate,
Worst loading position is being arranged in hinged place in wheel load pair.
The moment of flexure of every meter of wide lath:
Msp: mobile load moment of flexure, Msg: dead load moment of flexure, Ms: design maximum moment of flexure, a: the effective work width of cantilever slab,
μ: impact coefficient.
The shearing of every meter of wide lath out:
Cantilever slab bearing capacity is by current specifications " highway reinforced concrete and prestressed concrete bridge contain design specification " JTG
D62-2004 opposite side girder cantilever plate is checked.
Multiple tracks diaphragm is increased, makes main beam stress more evenly, in order to relatively accurately reflect the stress of practical structures
Situation is reduced to this class formation the beam lattice system intersected in length and breadth, solves by the space structure of system of bars.By widened structure
Power loads on former bridge as external load.The bearing capacity for checking former bridge girder, after meeting current specifications requirement, can use this
Structure is widened.
Two, widened structure checks
Widened structure stress is mainly born by anchor bolt, is primarily subjected to shearing and moment of flexure, is calculated the shearing of anchor bolt:
V=q1l1+q2h (7)
q1: the laterally severe of every linear meter(lin.m.), q2: the severe of vertical every linear meter(lin.m.), l1: the width widened, h: girder height
Then moment of flexure is calculated
M=V (l1+l0)/2 (8)
Group's anchor shear and Moment under carry out forcing checking, and according to calculate reasonable structure design anchor bolt bore dia,
The parameters such as drilling depth.
Shown under the premise of original bridge is met the requirements according to more Short/Medium Span Bridge calculated results, this kind of structure
Width can accomplish 2.5m wide.
Table 1
Widened structure work progress provided by the invention is as follows
(1) preparation
Take down the old bridge anticollision barrier, and cuts the part edge of a wing and mat formation.This is widened transverse structure and is staggered old bridge diaphragm plate arrangement,
According to old bridge size and structure across footpath, arrangement spacing is calculated.It needs to carry out repetition measurement to ready-made size before steel construction processing and fabricating, it is ensured that
Machining accuracy.
(2) it drills
Steel truss buries anchor bolt 6,8 position of bar planting drills, the impact drilling can be used, when drilling should avoid girder and answer in advance
Power muscle and main reinforcement.It is drilled dust in Kong Houyong compressed air blowout hole, then is stained with alcohol or acetone scouring hole inner wall with absorbent cotton.
(3) bar planting
Anchoring adhesive is completely infused in hole, and then anchor bolt 6, bar planting 8 are slowly unidirectionally screwed in, can not inversely be inverted halfway, until
Reinforcing bar protrudes into bottom hole.Anchor bolt 6, bar planting 8 are fully cured after being implanted into it, can carry out next procedure.
(4) web member is installed
End plate 5 is inserted in anchor bolt 6, nut is tightened and fixes, then lifts web member to suitable position, respectively with end plate
It is welded and fixed.
(5) affixing steel plate
Beam bottom steel plate and beam contact surface answer full coat structure glue, are inserted in bar planting, tighten bolt and fix.
(6) crossbeam and diagonal brace are installed
Bracket, crossbeam and diagonal brace are tightened together using being welded to connect.Bracket and beam contact surface are answered into full coat structure glue,
It is inserted in bar planting, bolt is tightened and fixes.Bracket bottom is fixed together by welding with beam bottom steel plate.
(7) stringer and floorings are installed
After widened structure installation is stablized, after progress loading test is met the requirements, stringer and floorings are installed.
Quick bridge widening structure provided by the invention can construct in the case where uninterrupted traffic, the bridge widening
Structure reduces the substructure of newly building bridge, avoids modified difference between new and old bridge to the mechanical property of connection armored concrete
The problems such as energy influences, connecting portion concrete generates cracking, solves the problems such as work progress need to interrupt existing traffic.
It is understood that be the example in order to illustrate the principle of the present invention and exploitativeness above, the present invention not office
It is limited to this.It for those skilled in the art, without departing from the spirit and substance in the present invention, can be with
All variations and modifications are made, these variations and modifications are also considered as protection scope of the present invention.
Claims (7)
1. a kind of quick bridge widening structure of uninterrupted traffic, comprising: crossbeam, diagonal brace, web member, beam bottom steel plate, is indulged bracket
Beam, floorings, it is characterised in that:
The bracket is located on the outside of pontic girder web plate, and flange plate lower part protrudes outward, the support beyond pontic edge of a wing board width
Between frame and girder, between the bracket and crossbeam, between the bracket and diagonal brace, consolidated between the diagonal brace and crossbeam
It is fixed；The web member is located between the Liang Yuliang of pontic, and fixes with the web of beam, intersects web member and fixes in crosspoint；It is described
Beam bottom steel plate is fixedly connected with beam bottom；The stringer is located on crossbeam, fixed floorings above longitudinal and cross beam.
2. the quick bridge widening structure of uninterrupted traffic according to claim 1, it is characterised in that: the bracket passes through
Bar planting is fixedly connected with girder, and smearing structure glue between the bracket and girder.
3. the quick bridge widening structure of uninterrupted traffic according to claim 1 or 2, it is characterised in that: the bracket
Between crossbeam, between the bracket and diagonal brace, by being welded and fixed between the diagonal brace and crossbeam.
4. the quick bridge widening structure of uninterrupted traffic according to claim 3, it is characterised in that: the web member passes through
Anchor bolt and end plate are fastened with web, intersect web member in crosspoint by being welded and fixed.
5. the quick bridge widening structure of uninterrupted traffic according to claim 4, it is characterised in that: the beam bottom steel plate
It is connect by bar planting with beam bottom, and the smearing structure glue between beam.
6. the quick bridge widening structure of uninterrupted traffic according to claim 5, it is characterised in that: the crossbeam, support
Frame, diagonal brace, web member and stringer use channel steel or i-steel component.
7. the installation method of the quick bridge widening structure of uninterrupted traffic described in claim 4, which is characterized in that including following
Step:
(1) preparation: take down the old bridge anticollision barrier, and cuts the part edge of a wing and mat formation；
(2) it drills: being drilled using impact drill in the position of embedded anchor bolt and bar planting, be drilled Kong Houyong compressed air blowout hole inner powder
Dirt, then alcohol or acetone scouring hole inner wall are stained with absorbent cotton；
(3) bar planting: completely infusing anchoring adhesive in hole, and then anchor bolt and bar planting are unidirectionally screwed in；
(4) web member is installed: end plate being inserted in anchor bolt, nut is tightened and fixes, then web member and end plate are welded and fixed；
(5) affixing steel plate: full coat structure glue between beam bottom steel plate and beam contact surface is inserted in bar planting, tightens bolt and fix；
(6) install crossbeam and diagonal brace: bracket, crossbeam and diagonal brace tighten together using being welded to connect, bracket are contacted with crossbeam
Full coat structure glue between face, is inserted in bar planting, tightens bolt and fixes, and bracket bottom is fixed together by welding with beam bottom steel plate；
(7) stringer and floorings are installed.
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| CN201710360368.2A CN107100092B (en) | 2017-05-21 | 2017-05-21 | A kind of quick bridge widening structure and installation method of uninterrupted traffic |
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| CN201710360368.2A CN107100092B (en) | 2017-05-21 | 2017-05-21 | A kind of quick bridge widening structure and installation method of uninterrupted traffic |
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Families Citing this family (6)
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| CN107916625B (en) * | 2017-12-25 | 2023-05-05 | 山西省交通规划勘察设计院有限公司 | Widening structure and method for wide cantilever box girder |
| CN108385547A (en) * | 2018-02-07 | 2018-08-10 | 大连理工大学 | A kind of additional truss reinforcement means of arch bridge floorings |
| CN110804956B (en) * | 2019-09-26 | 2021-10-01 | 中国一冶集团有限公司 | Construction method for replacing special-shaped curve steel box girder support |
| CN110735387A (en) * | 2019-11-04 | 2020-01-31 | 河南省交通规划设计研究院股份有限公司 | Transverse connection device for small box girders of bridge and construction method thereof |
| CN113944112B (en) * | 2021-11-15 | 2023-06-09 | 广西科技大学 | Construction method for rebuilding and expanding bridge |
| CN114382019A (en) * | 2021-12-30 | 2022-04-22 | 浙江正方交通建设有限公司 | Active service T-beam bridge comprehensive reinforcement structure and construction method |
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| JP2003193419A (en) * | 2001-12-25 | 2003-07-09 | Sato Tekko Co Ltd | Reinforcing structure of steel truss bridge |
| CN101424075B (en) * | 2008-11-24 | 2010-10-20 | 重庆交通大学 | Concrete box girder bridge widening and reinforced structure and construction method thereof |
| CN104233963B (en) * | 2014-09-10 | 2016-02-17 | 北京工业大学 | A kind of adjustable prestressed steel truss for reinforcing PSC Continuous Box Girder Bridge and construction method |
| CN104372748A (en) * | 2014-11-15 | 2015-02-25 | 北京市政路桥股份有限公司 | Steel truss diaphragm for bridge broadening new-old bridge connecting |
| CN205975388U (en) * | 2016-07-18 | 2017-02-22 | 赵启林 | Bridge girder reinforcing device |
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