CN105803917B - Method for preventing lateral bending deformation of edge beam of T-shaped beam bridge through external prestressing - Google Patents
Method for preventing lateral bending deformation of edge beam of T-shaped beam bridge through external prestressing Download PDFInfo
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- CN105803917B CN105803917B CN201610145196.2A CN201610145196A CN105803917B CN 105803917 B CN105803917 B CN 105803917B CN 201610145196 A CN201610145196 A CN 201610145196A CN 105803917 B CN105803917 B CN 105803917B
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- bar
- side bar
- tensioning
- support
- cantilever
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005452 bending Methods 0.000 title claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 33
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 7
- 239000011888 foil Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 4
- 210000003205 muscle Anatomy 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 239000011513 prestressed concrete Substances 0.000 claims description 2
- 238000000338 in vitro Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract 6
- 230000002787 reinforcement Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D12/00—Bridges characterised by a combination of structures not covered as a whole by a single one of groups E01D2/00 - E01D11/00
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a method for preventing lateral bending deformation of an edge beam of a T-shaped beam bridge. The method includes the steps that external prestressing reinforcing steel bars are installed on the external cantilever side of the prefabricated edge beam through a support, then edge-beam prestressing reinforcing steel bars are tensioned one by one; in the tensioning process, the edge beam is bent and deformed towards the external cantilever side, and when the strain value epsilon at the maximum cantilever position of an external cantilever is a strain tolerance value [epsilon], tensioning is paused; then the external prestressing reinforcing steel bars are tensioned, and the value of lateral bending deformation of the midspan of the edge beam is returned to zero through the lateral bending moment generated through the external prestressing reinforcing steel bars; the process is repeated till the edge-beam lateral bending deformation generated by tensioning the last edge-beam prestressing reinforcing steel bar is eliminated. According to the method, the lateral bending moment generated when the mass center is deviated from the center line of a web of the edge beam when the edge-beam prestressing reinforcing steel bars are tensioned is balanced through external prestressing, and lateral bending deformation can be effectively prevented during construction of the edge beam.
Description
Technical field
The present invention relates to highway bridge, particularly a kind of to prevent tee girder bridge side bar lateral thrust from becoming using external prestressing
The method of shape.
Background technology
Tee girder bridge is a kind of common highway bridge, and in building course, its side bar is big because of slenderness ratio, laterally for tee girder bridge
Bending rigidity is little, and the outside cantilever lateral deviation of side bar barycenter is from side bar web center line (see Fig. 1), causes the side bar in construction in advance should
After power reinforced bar stretching, side bar is susceptible to outside cantilever lateral bend deformation.The especially stretch-draw prestressing force when side bar age is less
Prestressed reinforcement of tensioning lateral thrust deformation extent is big many when reinforcement ratio age is larger.Deposit that the beam time is long, side bar it is lateral
Flexural deformation degree can gradually increase with the prolongation for depositing the beam time.
There is lateral thrust deformation in the side bar of tee girder bridge, side bar can be made to produce crack in construction, have a strong impact on side bar
The durability of construction quality and side bar.
At present, prevent the method that tee girder bridge side bar produces lateral thrust deformation from mainly including：
1st, in the side bar of prefabricated tee girder bridge, increase lateral support, reduce the slenderness ratio of tee girder bridge side bar；
2nd, strictly by design requirement side bar deformed bar cable tensios control is carried out, prematurely prestressed reinforcement of tensioning；
3rd, after completing deformed bar tensioning, the prefabricated side bar resting period in factory is less than 60 days, and sets up and finish
The diaphragm plate that should be coupled as early as possible afterwards between each side bar, to increase its lateral confinement, prevents its lateral thrust deformation from continuing to develop.
Because not considering side bar barycenter deviation side bar web center line, this causes side bar lateral thrust to deform to above method
Leading factor, therefore it has certain limitation, and the lateral thrust deformation to mitigating side bar can only play a role；And side
Method 1 can only temporarily solve the lateral thrust deformation of demoulding front side beam, and side bar can still produce lateral thrust deformation after form removal；Side
Method 2 can extend construction period.
The content of the invention
For the above-mentioned technical problem that prior art is present, it is an object of the invention to provide a kind of simple, effectively utilization
External prestressing prevents the method that tee girder bridge side bar lateral thrust deforms.
For achieving the above object, the utilization external prestressing that the present invention is provided prevents tee girder bridge side bar lateral thrust from deforming
Method, comprise the steps：
Step 1, installation external prestressing reinforcing bar
Side support is fixedly mounted respectively at the web side both ends of the outer cantilever side of side bar, the fixed peace in the middle of the support of both sides
Dress intermediate support, the transverse height of intermediate support is more than the transverse height of side support, the top of support and intermediate support point on side
Not An Zhuan steering gear (a kind of steel pipe of bending), and make the steering gear of side support and steering gear and the side bar barycenter of intermediate support exist
In the same plane vertical with the web side of side bar；External prestressing reinforcing bar is passed through into the steering of intermediate support and side support
Its two ends is temporarily fixed on the support of side after device；
Step 2, tensioning side bar deformed bar and external prestressing reinforcing bar
First amesdial is installed at cantilever side correspondence side bar barycenter in side bar span centre, for recording tensioning side bar prestress steel
The lateral thrust deformation values of side bar span centre during muscle；Foil gauge is pasted at the outer cantilever maximum cantilever of side bar span centre, for supervising
The strain value ε surveyed at the outer cantilever maximum cantilever of side bar span centre during tensioning side bar deformed bar；
Then with the stretching force of setting by root tensioning side bar deformed bar, in stretching process, the outside cantilever lateral bending of side bar
Song deformation, (this when the strain value ε at foil gauge monitors the outer cantilever maximum cantilever of side bar span centre reaches strain feasible value [ε]
Shi Keneng tensioning piece deformed bar, it is also possible to more than one deformed bar of tensioning), suspend tensioning side bar and in advance should
Power reinforcing bar, with amesdial the lateral thrust deformation values Δ of now side bar span centre is recorded；Then tensioning external prestressing reinforcing bar, utilizes
The lateral bending square that external prestressing reinforcing bar is produced makes the lateral thrust deformation values Δ of side bar span centre be zeroed, and keeps external pre- after Δ zero
Stress reinforced bar stretching power is constant；Then next side bar deformed bar of tensioning is continued (if before tensioning by above same procedure
The stretching force of a piece side bar deformed bar not up to designs stretching force, now continues tensioning to it, makes stretching force reach design
Next side bar deformed bar of tensioning again after stretching force)；So repeatedly, until after last root side bar deformed bar tensioning
Till the lateral thrust deformation values of span centre are zeroed；Then external prestressing reinforcing bar is temporarily anchored on the support of side；
Strain feasible value [ε] is tried to achieve by following formula：
In formula
Ec：Side bar adopts the elastic modelling quantity (MPa) of concrete；
ftk：Side bar adopts the standard value (MPa) of concrete tensile strength, can pass through《Highway reinforced concrete and in advance should
Power concrete bridges and culverts design specification》(JTG D62) inquiry is obtained；
Step 3, side bar deformed bar tensioning lift side bar after finishing in place；Then the horizontal of side bar is routinely completed
It is coupled；Finally external prestressing reinforcing bar, intermediate support and side support are removed together, completing tee girder bridge side bar prevents lateral curved
The constructing operation of song deformation.
Compared with the existing method for preventing tee girder bridge side bar from producing lateral thrust deformation, the invention has the beneficial effects as follows：
(1) by external prestressing reinforcing bar can active balance tensioning side bar deformed bar when because side bar barycenter deviate side bar
The lateral moment of flexure that web center line is produced, so as to play a part of effectively to prevent side bar lateral thrust from deforming.
(2) according to strain feasible value [ε] the tensioning side bar prestress steel at the outer cantilever maximum cantilever of the side bar for calculating
Muscle, it can be ensured that side bar occurs without crack in stretching process.
(3) the method construction is simple, short construction period.
(4) external prestressing reinforcing bar, intermediate support, side support can be used in turn used by, material-saving expense.
Description of the drawings
Fig. 1 is the side view of side bar；
Fig. 2 is the front view of the outer cantilever side of side bar for installing external prestressing reinforcing bar；
Fig. 3 is C-C sectional drawings in Fig. 2；
Fig. 4 is A-A sectional drawings in Fig. 2；
Fig. 5 is B-B sectional drawings in Fig. 2.
In figure：1-side bar, 1a-outer cantilever, 1b-interior cantilever, 1c-web, 2-side bar barycenter, 3-side bar web center line,
4-foil gauge, 5-external prestressing reinforcing bar, 6-intermediate support, 7-side support, 8-steering gear, 9-amesdial, 10-steel plate.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
The present embodiment is to prevent from side bar during certain freely-supported tee girder bridge construction from lateral thrust occurring using the inventive method to become
Shape.
With reference to Fig. 1 to Fig. 5, the freely-supported tee girder spanning footpath is 47m, and side bar 1 adopts C50 concretings, C50 concrete
Elastic modulus Ec=3.45 × 104MPa, looks into《Highway reinforced concrete and prestressed concrete bridge contain design specification》(JTG
D62-2004 standard value f of concrete tensile strength can) be obtainedtk=2.65MPa；Lateral bending rigidity I of side barxx=16.71 ×
1010(mm4), the outer cantilever 1a transverse widths of side bar are 1200mm, and interior cantilever 1b transverse widths are 750mm, and side bar barycenter 2 is outside
From side bar web center line 3, height of the side bar barycenter 2 from side bar bottom is 1667mm to cantilever lateral deviation, and it is pre- that side bar has N1～N5
Stress reinforcing bar 5, designs stretching force NpIt is 3710.7kN.
The construction method for preventing side bar lateral thrust from deforming, step is as follows：
Step 1, installation external prestressing reinforcing bar 5
It is pre-buried when utilizing in prefabricated side bar at the 8.5m of rear and front end on the side of the web 1c of the outer cantilever side of side bar 1
Steel plate 10 fixedly mounts respectively side support 7, and intermediate support 6, side are fixedly mounted on the web side of both sides support middle
The transverse height of frame 900mm less than the transverse height of intermediate support, on side, the top of support and intermediate support is respectively mounted steering
A kind of device 8 (steel pipe of bending), the steering gear of intermediate support is 900mm with the transverse height difference of the steering gear of side support；By body
Then external prestressing reinforcing bar is temporarily fixed to side support by External prestressed reinforcing bar through the steering gear of intermediate support and side support
On.
Step 2, tensioning side bar deformed bar and external prestressing reinforcing bar
First amesdial 9 is installed at cantilever side correspondence side bar barycenter in side bar span centre, for recording tensioning side bar prestressing force
The lateral thrust deformation values of side bar span centre during reinforcing bar；Foil gauge 4 is pasted at the outer cantilever maximum cantilever of side bar span centre, is used for
Strain value ε during monitoring tensioning side bar deformed bar at the outer cantilever maximum cantilever of side bar span centre；Outside side bar span centre
Strain feasible value [ε] at cantilever maximum cantilever is：
Then with set stretching force 3710.7kN according to the order of N1～N5 by root tensioning side bar deformed bar, tensioning
During, the deformation of side bar outside cantilever lateral bend, before tensioning after two deformed bars N1, N2, foil gauge monitor side bar across
In outer cantilever maximum cantilever at strain value ε reach strain feasible value [ε], now suspend tensioning side bar deformed bar, use
Lateral thrust deformation values Δ in amesdial writing edge girder span is 40.9mm；Then tensioning external prestressing reinforcing bar, utilizes external
The lateral bending square that deformed bar is produced makes the lateral thrust deformation values Δ zero that side bar span centre is produced, and keeps external pre- after Δ zero
Stress reinforced bar stretching power is constant；Then continue by the side bar deformed bar behind root tensioning by above same procedure, tensioning is arrived
After 4th deformed bar N4, the strain value ε at the outer cantilever maximum cantilever of side bar span centre reaches again strain feasible value
[ε], now stops the side bar deformed bar behind tensioning, and the lateral thrust deformation values Δ in writing edge girder span is 31.4mm,
Then stretching force is increased on the basis of first time stretching force to external prestressing reinforcing bar, to the side that side bar span centre is produced for second
To flexural deformation value Δ zero, keep the stretching force of now external prestressing reinforcing bar constant；The 5th side bar of last tensioning in advance should
Power reinforcing bar N5, after N5 tensioning, the strain value ε and not up to strain feasible value [ε] at the outer cantilever maximum cantilever of side bar span centre, now
Stretching force is further added by the basis of second stretching force to external prestressing reinforcing bar, by ε values zero；Then by external prestressing
Reinforcing bar is temporarily anchored on the support of side.
Step 3, side bar deformed bar tensioning lift side bar after finishing in place；Then the horizontal of side bar is routinely completed
It is coupled；Finally intermediate support, side support and external prestressing reinforcing bar are removed together, completing tee girder bridge side bar prevents lateral curved
The constructing operation of song deformation.
Claims (1)
1. a kind of utilization external prestressing prevents the method that tee girder bridge side bar lateral thrust deforms, it is characterised in that including following
Step：
Step 1, installation external prestressing reinforcing bar (5)
Side support (7) is fixedly mounted respectively at web (1c) the side both ends of outer cantilever (1a) side of side bar (1), in both sides support
Centre fixed installation intermediate support (6), the transverse height of intermediate support is more than the transverse height of side support, support and centre on side
The top of support is respectively mounted steering gear (8), and makes the steering gear of side support and the steering gear of intermediate support and side bar barycenter (2)
In the same plane vertical with the web side of side bar；By external prestressing reinforcing bar (5) through intermediate support and side support
Steering gear after its two ends is temporarily fixed on the support of side；
Step 2, tensioning side bar deformed bar and external prestressing reinforcing bar
First amesdial (9) is installed at correspondence side bar barycenter (2) place in cantilever side in side bar span centre, for recording tensioning side bar prestressing force
The lateral thrust deformation values of side bar span centre during reinforcing bar；Foil gauge (4) is pasted at the outer cantilever maximum cantilever of side bar span centre, is used
Strain value ε during to monitor tensioning side bar deformed bar at the outer cantilever maximum cantilever of side bar span centre；
Then with the stretching force of setting by root tensioning side bar deformed bar, in stretching process, the outside cantilever lateral bend of side bar becomes
Shape, when the strain value ε at foil gauge monitors the outer cantilever maximum cantilever of side bar span centre reaches strain feasible value [ε], suspends
Side bar deformed bar is drawn, with amesdial the lateral thrust deformation values Δ of now side bar span centre is recorded；Then tensioning in advance should in vitro
Power reinforcing bar, the lateral bending square produced using external prestressing reinforcing bar makes the lateral thrust deformation values Δ of side bar span centre be zeroed, Δ zero
Keep external prestressing reinforced bar stretching power constant afterwards；Then next side bar prestress steel of tensioning is continued by above same procedure
Muscle；So repeatedly, after last root side bar deformed bar tensioning till the lateral thrust deformation values of span centre are zeroed；So
External prestressing reinforcing bar is temporarily anchored on the support of side afterwards；
Strain feasible value [ε] is tried to achieve by following formula：
In formula
Ec：Side bar adopts the elastic modelling quantity of concrete,
ftk：Side bar adopts the standard value of concrete tensile strength, can pass through《Highway reinforced concrete and prestressed concrete bridge
Contain design specification》Inquiry is obtained；
Step 3, side bar deformed bar tensioning lift side bar after finishing in place；Then the horizontal of side bar is routinely completed
Knot；Finally external prestressing reinforcing bar, intermediate support and side support are removed together, completing tee girder bridge side bar prevents lateral thrust
The constructing operation of deformation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610145196.2A CN105803917B (en) | 2016-03-14 | 2016-03-14 | Method for preventing lateral bending deformation of edge beam of T-shaped beam bridge through external prestressing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610145196.2A CN105803917B (en) | 2016-03-14 | 2016-03-14 | Method for preventing lateral bending deformation of edge beam of T-shaped beam bridge through external prestressing |
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| CN105803917B true CN105803917B (en) | 2017-05-03 |
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| CN107908870B (en) * | 2017-11-14 | 2021-01-05 | 东南大学 | Analysis method for bending resistance and bearing capacity of in-vivo pre-stressed laminated wood beam |
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|---|---|---|---|---|
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| KR20040010852A (en) * | 2001-11-12 | 2004-02-05 | 이형훈 | Method for protecting the loss of prestress in prestressed beam by temporary load |
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| CN204491425U (en) * | 2014-12-23 | 2015-07-22 | 衡水橡胶股份有限公司 | A kind of external prestressing strengthening structure of T-shaped bridge diaphragm |
| CN205012238U (en) * | 2015-10-13 | 2016-02-03 | 吉林大学 | A letter T roof beam anchor based on violently open prestressing force |
| CN105297642A (en) * | 2015-11-06 | 2016-02-03 | 沈阳建筑大学 | Cover beam external prestressing reinforcing structure and construction method thereof |
-
2016
- 2016-03-14 CN CN201610145196.2A patent/CN105803917B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SU777172A1 (en) * | 1979-04-24 | 1980-11-07 | Белорусское Отделение Ордена Трудового Красного Знамени Центрального Научно- Исследовательского И Проектного Института Строительных Металлоконструкций | Method of beam prestressing |
| KR20040010852A (en) * | 2001-11-12 | 2004-02-05 | 이형훈 | Method for protecting the loss of prestress in prestressed beam by temporary load |
| CN1884702A (en) * | 2006-06-29 | 2006-12-27 | 杨爱军 | Steel beam suspension arm spanning and construction method adopting external eccentric prestress system |
| CN204491425U (en) * | 2014-12-23 | 2015-07-22 | 衡水橡胶股份有限公司 | A kind of external prestressing strengthening structure of T-shaped bridge diaphragm |
| CN205012238U (en) * | 2015-10-13 | 2016-02-03 | 吉林大学 | A letter T roof beam anchor based on violently open prestressing force |
| CN105297642A (en) * | 2015-11-06 | 2016-02-03 | 沈阳建筑大学 | Cover beam external prestressing reinforcing structure and construction method thereof |
Non-Patent Citations (1)
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Denomination of invention: A method of using external prestressing to prevent lateral bending deformation of T-beam bridge edge beams Granted publication date: 20170503 Pledgee: China Co. truction Bank Corp Guangzhou Tianhe subbranch Pledgor: GUANGZHOU ZHANYA CIVIL ENGINEERING TECHNOLOGY Co.,Ltd. Registration number: Y2024980005467 |
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