CN109137760A - The active reinforcement means of multispan normal reinforced concrete beam bridge - Google Patents
The active reinforcement means of multispan normal reinforced concrete beam bridge Download PDFInfo
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- CN109137760A CN109137760A CN201811143661.4A CN201811143661A CN109137760A CN 109137760 A CN109137760 A CN 109137760A CN 201811143661 A CN201811143661 A CN 201811143661A CN 109137760 A CN109137760 A CN 109137760A
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- steel arch
- arch piece
- multispan
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- reinforced concrete
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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 invention discloses a kind of active reinforcement means of multispan normal reinforced concrete beam bridge, and steel arch piece is added under multispan normal reinforced concrete beam to be reinforced, and bracing members column is arranged between steel arch piece and normal concrete beams, reinforcing pull rod is arranged between the arch springing of steel arch piece two sides.The present invention, which uses, adds arch piece method, rigid constraint support system is formed reinforcing between arch piece and former normal reinforced concrete beam, so that beam internal force reduces, the bearing capacity of bridge can not only be increased substantially, increase the overall stiffness to reinforcement bridge, and can effectively shrink beam body fracture width, improves the durability of bridge, the reinforcing pull rod of steel arch piece arch springing setting is conducive to balance the horizontal force that steel arch piece arch springing generates.Reinforced construction method of the present invention is easy, and reinforcing process is orderly, and construction quality is easy to control, strong operability, and effect is obvious；Beams of concrete reduces mid span moment, contraction beam bottom fracture width, 30% or more beams of concrete bearing power increase after reinforcing under upward vertical force effect.
Description
Technical field
The invention belongs to transportation bridge engineeting reinforcement technique field more particularly to a kind of multispan regular reinforcement coagulations
The active reinforcement means of native beam bridge.
Background technique
In China, normal reinforced concrete beam bridge especially ordinary reinforced concrete Hollow Slab Beam Bridge, because it is used simply
The construction technology of convenient and fast precast assembly, was widely used before 2004 by each standard highway in China.But it is old with material
There are a large amount of cracks in age, the increasingly increased volume of traffic, most of normal reinforced concrete beam, and partial fracture has been more than specification limit
Width, bridge can not meet operation demand, and the obvious lower flexure strain of span centre, bearing capacity and comfort decline occurs in minority.If tearing open
Fall to rebuild, time-consuming and laborious, current main reinforcement means is affixing steel plate or fibrous composite, application external prestressing etc..
However, lot of examples shows that original method consolidation effect is little, and new and old material bonds fine or not degree direct influence consolidation effect,
The disengaging that shortly will appear the old and new's material is runed after most bridge strengthening, the problems such as cohesive force declines, structural cracks cannot get
Effectively limitation, or even the crack that development is new, bridge capacity improve not significant.
Summary of the invention
A kind of the technical problem to be solved in the present invention is to provide construction is simples quick, the good multispan ordinary steel of consolidation effect
The active reinforcement means of reinforced concrete beam bridge.
In order to solve the above technical problems, the invention adopts the following technical scheme:
The active reinforcement means of multispan normal reinforced concrete beam bridge, under multispan normal reinforced concrete beam to be reinforced
Steel arch piece is added, bracing members column is set between steel arch piece and normal concrete beams, reinforcing pull rod is set between the arch springing of steel arch piece two sides.
Bracing members column is arranged symmetrically centered on span centre.
The active reinforcement means of above-mentioned multispan normal reinforced concrete beam bridge, in beams of concrete span centre section beam bottom and steel arch piece
Between 3~5 power supporting points straight up of setting, vertical force provided by supporting point passes through the jack jacking on temporary support point
Afterwards, it will be held out against between steel arch piece and beams of concrete with bracing members column, discharge the jack on temporary support point, the support on jack
Power is transferred on the bracing members column being permanently fixed.
Bracing members post design needs to draft the material of bracing members column according to the power P straight up being applied on beams of concrete
And sectional dimension, bracing members column preferably use square steel to make, it is interior closely knit with C30 Concrete Filled.
Steel arch piece and skewback are by being welded and fixed, and skewback is fixed by being implanted into the anchor bolt of former abutment, and steel arch piece encircles at bridge pier
By the anchor bolt of implantation pier cap beam and between pier stud, gooseneck is welded and fixed seat.
The active reinforcement means of above-mentioned multispan normal reinforced concrete beam bridge welds reinforcing pull rod riveting in steel arch piece two sides arch springing
, horizontal reinforcing pull rod is installed, setting turnbuckle is among pull rod to reconcile rod stress between rivet set.
Every beams of concrete bottom needs to add 1~2 steel arch piece according to stress, and setting horizontal-associate is formed whole between steel arch piece transverse direction
Body.
Material and the sectional dimension internal force according to suffered by structure for the steel arch piece design added determine, wherein
Reinforcing pull rod horizontal pull meets following formula:
Steel arch piece arch springing moment MAMeet following formula with mid span moment:
MB=X1-X2(R-d)
In above formula:Moment of flexure at the elastic center calculated for elastic center method,For horizontal force at elastic center,It is elastic center at a distance from the center of circle, y
For the vertical distance of elastic center to vault,For the central angle of steel arch on piece arbitrary point,For the center of circle between two arch springing of steel arch piece
Angle, MPFor the moment of flexure that the corresponding basic structure of steel arch piece generates under the action of power P straight up, EI is that the bending resistance of steel arch piece is rigid
Degree, EA are the compressional stiffness of steel arch piece.
According to aforementioned formula, the P of power straight up that steel arch piece provides is bigger, and the reverse bending moment of generation is bigger, suffered by structure
Total moment of flexure it is smaller.The reverse bending moment that power P is generated straight up should not exceed the moment of flexure of dead load generation.Multispan regular reinforcement coagulation
The spaning middle section that the moment of flexure maximum cross-section that native beam bridge structure is generated by action effect is a=l/2, bracing members column provide straight up
When power is arranged near span centre, the reverse bending moment of generation is bigger, and total moment of flexure suffered by structure is smaller.Bracing members counter-force number and
Away from needing to arrange according to concrete across footpath, bracing members column counter-force o'clock is advisable with 3~5 points, is arranged symmetrically centered on span centre.
To reinforced concrete beam arbitrary section moment of flexure decreasing value and arch piece and bracing members column provide the P of power straight up and
The loading position Xi of power is related, wherein
Beams of concrete arbitrary section maximal bending moment expression formula after reinforcing are as follows:
Fulcrum section maximum shear expression formula are as follows:
In formula: qgFor dead load evenly load；qpFor mobile load evenly load；PpFor mobile load load；P arch piece provides
Load straight up；A is distance of the beams of concrete arbitrary section to beam-ends；L is that beams of concrete calculates across footpath；XiIt is vertical
Upward load is to the distance for calculating section, and calculating cross-sectional left, load number is m straight up, and it is right to calculate section
Load number is n-m straight up for side, and n is the number of load straight up；mcFor each beams of concrete transverse direction
Breadth coefficient is constant；μ is vehicle impact coefficient.
It determines after being applied to the loading position Xi of the P of power straight up on beams of concrete and power, tentatively drafts steel arch piece
Material and sectional dimension, then calculate the moment of flexure of the internal force of reinforcing pull rod, impost horizontal thrust, arch springing and vault, checking computations are preliminary
Whether the material and sectional dimension of the steel arch piece and reinforcing pull rod drafted are reasonable, can determine after adjusting and checking checking computations repeatedly
The material and sectional dimension of steel arch piece and reinforcing pull rod.
Aiming at the problem that normal reinforced concrete beam bridge season cracking, inventor establishes a kind of multispan regular reinforcement coagulation
The active reinforcement means of native beam bridge, adds steel arch piece under multispan normal reinforced concrete beam to be reinforced, steel arch piece and common
Bracing members column is set between beams of concrete, reinforcing pull rod is set between the arch springing of steel arch piece two sides.The present invention, which uses, adds arch piece method,
It reinforces between arch piece and former normal reinforced concrete beam and forms rigid constraint support system, so that beam internal force reduces, it not only can be big
Amplitude improves the bearing capacity of bridge, increases the overall stiffness to reinforcement bridge, and can effectively shrink beam body fracture width, mentions
The durability of high bridge, the reinforcing pull rod of steel arch piece arch springing setting are conducive to balance the horizontal force that steel arch piece arch springing generates.
Compared with prior art, the present invention has major advantage below:
First, beams of concrete bottom has good mechanical characteristic after adding steel arch piece, and reinforced construction method is easy, reinforces
Process is orderly, and construction quality is easy to control, strong operability, and effect is obvious；Beams of concrete subtracts under upward vertical force effect
Small mid span moment, contraction beam bottom fracture width, 30% or more beams of concrete bearing power increase after reinforcing；Steel arch piece arch springing is provided with
Reinforcing pull rod can balance the horizontal force of steel arch piece arch springing generation, make after bridge pier and Abutment Reinforcement not by the effect of horizontal force.
Second, the system stress after reinforcing is clear, calculating formula of internal forces is simple, and calculated result is accurate；
Third, reinforcement means and calculating process are simple, easy, there is biggish practical engineering application value.
Detailed description of the invention
Fig. 1 is beams of concrete and steel arch piece stress sketch.
Fig. 2 is that certain bridge reinforces preceding elevation (unit cm) in embodiment 1.
Fig. 3 be in embodiment 1 certain bridge reinforce after elevation (unit cm).
Fig. 4 be in embodiment 1 certain bridge reinforce after cross-sectional view (unit cm).
Fig. 5 is the moment of flexure change curve in the section beams of concrete A under vertical forces at different levels after adding steel arch piece in Fig. 3.
Fig. 6 is the moment of flexure change curve of the beams of concrete B-section under vertical forces at different levels after adding steel arch piece in Fig. 3.
Fig. 7 is the moment of flexure change curve in the section beams of concrete C under vertical forces at different levels after adding steel arch piece in Fig. 3.
Fig. 8 is the schematic diagram of the active reinforcement means of multispan normal reinforced concrete beam bridge of the present invention.
In figure: 1 normal reinforced concrete beam, 2 steel arch pieces, 3 bracing members columns, 4 skewbacks, 5 reinforcing pull rod rivet sets, 6 reinforcing pull rods, 7
Turnbuckle, 8 shear amchor bolts, gooseneck between 9 piers, horizontal-associate between 10 arch pieces, 11 abutments, 12 bridge piers.
Specific embodiment
Embodiment 1
The one three ordinary reinforced concrete Hollow Slab Beam Bridge across 16m across footpath on certain second grade highway is shown in that attached drawing 1 is (each in figure
For example preceding expression formula of meaning of parameters), bridge was built up in nineteen ninety, and the bridge operation time 27 years, beam bottom occurred more lateral and oblique
Crack, partial fracture are more than specification limit for width.Former bridge design load grade is lower, after the increasingly increase of the volume of traffic, bridge bearing energy
Power is insufficient, and hollow slab girder span centre nearby ultra-wide crack occurs, needs actively to reinforce to receive to effectively reduce beams of concrete mid span moment
Contracting fracture width.
For this purpose, being added to the reinforced concrete hollow slab beam using the method that beam bottom adds steel arch piece referring to the present invention
Gu as shown in figure 3, calculating beams of concrete section A after reinforcing, B, C moment of flexure and the ratio for reinforcing starting section A, B, C moment of flexure.
The ordinary reinforced concrete Hollow Slab Beam Bridge of 16m across footpath, 19 cored slabs of lateral arrangement, cored slab automobile are maximum horizontal
It is 0.175 to breadth coefficient, vehicle impact coefficient is 0.292, dead load evenly load qgFor 13.4kN/m, mobile load evenly load qp
For 10.5kN/m, mobile load load PpFor 292kN.5 power supporting points straight up are arranged in a piece of steel arch on piece, by bridge span
In be arranged symmetrically, supporting point spacing is distributed as 1m and 2m, and power P presses 10kN, 15kN, 20kN three-level respectively straight up under every beam
Load, brings above data into formula:
For beams of concrete under the vertical force P load 30kN effect of 2m spacing, mid span moment reduces 36.4% after then reinforcing,
Each calculating section turn moment is reduced 30% or more.Under the vertical force P load 30kN effect of 1m spacing, mid span moment is reduced
44.2%.It can be seen that the remarkable result that the present invention reinforces concrete-bridge.Comprehensive mass data analysis, it is of the invention
Active reinforcement means, when the vertical force P loaded between arch piece and beams of concrete is loaded as 30kN, beams of concrete mid span moment is reduced
30% or more, bring considerable project benefit.
By constantly adjusting the size and spacing of the vertical force P loaded between arch piece and beams of concrete, not Tongfang is obtained
The reduction amount situation of the corresponding former normal reinforced concrete beam moment of flexure of case is shown in Table 1- table 2 and Fig. 5-Fig. 7.
Each calculating section turn moment value under vertical load at different levels when 1 spacing of table is 2m
Each calculating section turn moment value under vertical load at different levels when 2 spacing of table is 1m
It can be found that beams of concrete moment of flexure has following rule from table:
(1) the vertical force P loaded between the decreasing value of normal reinforced concrete beam moment of flexure, with arch piece and beams of concrete is linear
Relationship, the increasing of vertical force act on the reduction of moment of flexure obvious；
(2) it is smaller to encircle the vertical force P spacing loaded between piece and beams of concrete, is arranged closer to span centre, the reduction to moment of flexure
It is more obvious；
(3) vertical force P sphere of action inner concrete beam section turn moment reduces obvious compared with section each outside sphere of action.
Claims (9)
1. a kind of active reinforcement means of multispan normal reinforced concrete beam bridge, it is characterised in that: common in multispan to be reinforced
Steel arch piece is added under reinforced beam, between steel arch piece and normal concrete beams be arranged bracing members column, steel arch piece two sides arch springing it
Between reinforcing pull rod is set.
2. the active reinforcement means of multispan normal reinforced concrete beam bridge according to claim 1, it is characterised in that: described
Bracing members column is arranged symmetrically centered on span centre.
3. the active reinforcement means of multispan normal reinforced concrete beam bridge according to claim 1, it is characterised in that: mixed
3~5 power supporting points straight up are set between solidifying soil girder span middle section beam bottom and steel arch piece, and vertical force provided by supporting point passes through
After jack jacking on temporary support point, it will be held out against between steel arch piece and beams of concrete with bracing members column, discharge temporary support point
On jack, the support force on jack is transferred on the bracing members column being permanently fixed.
4. the active reinforcement means of multispan normal reinforced concrete beam bridge according to claim 1, it is characterised in that: described
Steel arch piece and skewback are by being welded and fixed, and skewback is fixed by being implanted into the anchor bolt of former abutment, and steel arch piece skewback passes through plant at bridge pier
Enter the anchor bolt of pier cap beam and gooseneck is welded and fixed between pier stud.
5. the active reinforcement means of multispan normal reinforced concrete beam bridge according to claim 1, it is characterised in that: described
Bracing members column is made of square steel, interior closely knit with C30 Concrete Filled.
6. the active reinforcement means of multispan normal reinforced concrete beam bridge according to claim 1, it is characterised in that: in steel
Encircle piece two sides arch springing and weld reinforcing pull rod rivet set, horizontal reinforcing pull rod is installed between rivet set, setting turnbuckle is drawn among pull rod with reconciling
Bar internal force.
7. the active reinforcement means of multispan normal reinforced concrete beam bridge according to claim 1, it is characterised in that: every
Beams of concrete bottom needs to add 1~2 steel arch piece according to stress, and setting horizontal-associate forms entirety between steel arch piece transverse direction.
8. the active reinforcement means of multispan normal reinforced concrete beam bridge according to claim 1, it is characterised in that: described
Material and the sectional dimension internal force according to suffered by structure for the steel arch piece design added determine, wherein
Reinforcing pull rod horizontal pull meets following formula:
Steel arch piece arch springing moment MAWith mid span moment MBMeet following formula:
MB=X1-X2(R-d)
In above formula:Moment of flexure at the elastic center calculated for elastic center method,
For horizontal force at elastic center,It is elastic center at a distance from the center of circle, y is elastic center erecting to vault
To distance,For the central angle of steel arch on piece arbitrary point,For the central angle between two arch springing of steel arch piece, MPIt is corresponding for steel arch piece
The moment of flexure that basic structure generates under the action of power P straight up, EI are the bending stiffness of steel arch piece, and EA is the resistance to compression of steel arch piece
Rigidity.
9. the active reinforcement means of multispan normal reinforced concrete beam bridge according to claim 1, it is characterised in that: described
To the moment of flexure decreasing value and arch piece of reinforced concrete beam arbitrary section and the load of the bracing members column P of power straight up provided and power
Position Xi is related, wherein
Beams of concrete arbitrary section maximal bending moment expression formula after reinforcing are as follows:
Fulcrum section maximum shear expression formula are as follows:
In formula: qgFor dead load evenly load；qpFor mobile load evenly load；PpFor mobile load load；P be arch piece provide it is vertical
Upward load；A is distance of the beams of concrete arbitrary section to beam-ends；L is that beams of concrete calculates across footpath；XiFor straight up
Load is to the distance for calculating section, and calculating cross-sectional left, load number is m straight up, and it is perpendicular to calculate cross-sectional right side
Straight load number upwards is n-m, and n is the number of load straight up；mcFor each beams of concrete cross direction profiles
Coefficient is constant；μ is vehicle impact coefficient.
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| CN201811143661.4A CN109137760A (en) | 2018-09-28 | 2018-09-28 | The active reinforcement means of multispan normal reinforced concrete beam bridge |
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| CN201811143661.4A CN109137760A (en) | 2018-09-28 | 2018-09-28 | The active reinforcement means of multispan normal reinforced concrete beam bridge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110952463A (en) * | 2019-12-10 | 2020-04-03 | 中铁大桥（南京）桥隧诊治有限公司 | Reverse jacking reinforcement method and jacking structure of concrete box girder bridge |
| CN111996919A (en) * | 2020-08-28 | 2020-11-27 | 王一勋 | Town road bridge simple beam construction structures |
| CN114232514A (en) * | 2021-11-25 | 2022-03-25 | 上海同济检测技术有限公司 | Continuous beam bridge active reinforcement method based on influence line principle |
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| JPH09137412A (en) * | 1995-11-13 | 1997-05-27 | Osaka Bendaa Kogyo Kk | Bridge reinforcing structure of viaduct |
| CN205399237U (en) * | 2016-03-09 | 2016-07-27 | 广西大学 | Reinforcing apparatus of concrete slab bridge / roof beam |
| CN106149572A (en) * | 2016-07-18 | 2016-11-23 | 江苏科技大学 | A kind of beam bridge ruggedized construction and reinforcement means |
| CN206219997U (en) * | 2016-10-27 | 2017-06-06 | 王超 | A kind of box crossbeam of bridge is reinforced and mounting structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110952463A (en) * | 2019-12-10 | 2020-04-03 | 中铁大桥（南京）桥隧诊治有限公司 | Reverse jacking reinforcement method and jacking structure of concrete box girder bridge |
| CN110952463B (en) * | 2019-12-10 | 2021-08-10 | 中铁桥隧技术有限公司 | Reverse jacking reinforcement method and jacking structure of concrete box girder bridge |
| CN111996919A (en) * | 2020-08-28 | 2020-11-27 | 王一勋 | Town road bridge simple beam construction structures |
| CN114232514A (en) * | 2021-11-25 | 2022-03-25 | 上海同济检测技术有限公司 | Continuous beam bridge active reinforcement method based on influence line principle |
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