CN108978483A - Mix girder stayed-cable bridge concrete box girder steel pipe support joint preloading method - Google Patents
Mix girder stayed-cable bridge concrete box girder steel pipe support joint preloading method Download PDFInfo
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- CN108978483A CN108978483A CN201810969331.4A CN201810969331A CN108978483A CN 108978483 A CN108978483 A CN 108978483A CN 201810969331 A CN201810969331 A CN 201810969331A CN 108978483 A CN108978483 A CN 108978483A
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- Prior art keywords
- preloading
- load
- water
- concrete block
- bracket
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Classifications
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
Abstract
The present invention provides a kind of mixing girder stayed-cable bridge concrete box girder steel pipe support joint preloading method, and along the horizontal preloading concrete block of box beam on rack template, along vertical web preloading steel strand wires, canvas water filling is laid in the region that diaphragm plate and vertical web enclose；Precompressed is classified to bracket jointly by above-mentioned material, and observes the shape amount of every grade of precompressed lower bracket change, according to the elasticity and inelastic deformation value of bracket, adjustment bracket absolute altitude to mould absolute altitude value.
Description
Technical field
The invention belongs to bridge construction fields, are related to a kind of applied to mixing girder stayed-cable bridge concrete of main bridge box beam steel
The preloading method of pipe holder.
Background technique
Girder stayed-cable bridge is mixed in construction, often using Bailey truss, driving into type steel-pipe pile as bearing pile, bracket is in concrete
Sedimentation may be generated in casting process, will affect the whole stress of bracket in this way.In order to avoid unevenly sinking in casting process
The appearance for dropping phenomenon needs to carry out precompressed to bracket before construction, with accurately learn non-resilient under load action of bracket and
Flexible deformation, intensity, rigidity and the stability of checking bracket, determines the adjusted value of template elevation of bottom, it is ensured that after bridge is built up
Reality it is linear with it is theoretical linear as consistent as possible.
Current steel pipe support precompressed is typically employed in preloading sand pocket and water bag mode on bracket, has the disadvantage in that
1, precompressed low efficiency at least needs 7d~10d using sandbag or water bag precompressed, pre-compaction process；
2, big using sandbag precompressed project amount, handling carry time-consuming, are laborious, and large labor intensity, need higher artificial
Take, machinery cost, purchase sandbag expense, it is also contemplated that sand is lost, whole cost is higher；
3, arrangement observation point is not easy to using sandbag precompressed, is unfavorable for the case where reflecting the sedimentation of entire bracket；
4, sand pocket is influenced by rainfall etc., and weight change is larger, will cause certain error to precompressed precision；
5, water bag precompressed requires preloading stringent, cannot use two water bag superpositions, because the water bag of bottom is by upper
The pressure of layer is possible to burst, and causes " water egg " to explode, belongs to major hazard source；
6, sand pocket or water bag precompressed can not accurately be adjusted precompressed counterweight, will affect test data precision.
Summary of the invention
The purpose of invention is to be unable to satisfy mixing girder stayed-cable bridge concrete for traditional sand pocket and water bag preloading method
The problem of box beam steel pipe support high standards, traditional pre-pressing process is improved, a kind of safe and convenient, quick, warp is provided
Ji, efficient mixing girder stayed-cable bridge concrete of main bridge box beam steel pipe support precompressed construction technology.
Technical scheme is as follows:
A kind of mixing girder stayed-cable bridge concrete box girder steel pipe support joint preloading method, it is characterised in that including following step
It is rapid:
(1) observation point is arranged: in cradle top surface, direction across bridge is in concrete box girder every vertical web design position to be poured
Be respectively arranged below an observation point, observation point indulges bridge to being arranged one every being no more than 5m；After bracket cope plate is laid with,
It removes all temporary load(ing)s in template and the absolute altitude before the non-precompressed of bracket is measured by each observation point in the case where zero load；
(2) pre-treatment is loaded:
(21) template surface sundries has been cleared up, water-proofing treatment has been carried out between piece each plate of template, it is ensured that water-tight；
(22) each section of diaphragm plate of concrete box girder to be poured and vertical web center line are released in measurement in template；Along tabula
Plate marks off Tong Kuai preloading area, marks off steel strand wires preloading area along vertical web, the region that diaphragm plate and vertical web enclose is water filling
Area；
(3) load: load is divided into 5 ranks, carries out classification pressure testing according to 25%, 50%, 75%, 100%, 110%；Add
Load mode is that preloading concrete block and steel strand wires and water filling, concrete mode are as follows；
(31) the diaphragm plate middle line and vertical web center line released according to measurement, along tabula Board position preloading concrete block, simultaneously
Along vertical web position preloading steel strand wires；
(32) canvas is laid in water filling area, each water filling area is all made of whole seamless canvas and is laid with, and inspection ensures canvas
There is no water leakage defects；When concrete block and steel strand wires heap are downloaded to certain altitude, canvas periphery is ridden over into the concrete block of preloading and steel twists
It at the top of line and compresses, synchronization is filled the water into each water filling area；
(33) by step (31), the construction of (32) circulation, until being loaded into design maximum load；
(4) bracket absolute altitude is observed: often being reached a load stage in loading procedure, is seen by observation point to bracket absolute altitude
It surveys, and hourly observation data；After 4 grades every grade of load of front adds, interval carries out deformation of timbering observation after 30 minutes；Reach highest
It is primary every observation in 24 hours after load stage load, when each observation point settling amount mean difference is less than 1mm, or continuously survey three times
When point settling amount average value is less than 5mm, that is, meets unloading condition, can start to unload；
(5) unload: uninstall process and loading procedure sequence are on the contrary, simultaneously load shedding, when reaching each load rank
It is observed record, and is compared with load record；
(6) it is recorded according to loading and unloading, analyzes the elasticity and inelastic deformation specific value of bracket, bracket mark is adjusted with this
Up to mould absolute altitude value.
The present invention using the multiple materials such as concrete block, steel strand wires and water storage as counterweight joint preloading, with traditional sand pocket or
Water bag preloading method is compared, and is had the advantage that
1, since the injecting process can be controlled arbitrarily, keep counterweight accuracy and range of the invention adjustable, improve precompressed
Precision；
2, convenient and quick construction, Material Storage transport, hang safe and simple, and precompressed speed is fast, can the effectively save duration,
Precompressed of the present invention generally only needs 2d~3d.
3, more observation point can be arranged using method of the invention, have a question to which data to add repeatedly
Pressure, measurement；
4, the method for the present invention material turnover is high, and method is simple, and whole cost reduces by 60% compared to sand pocket precompressed, compares water
Bag precompressed reduces by 50%, has good economic effect.
Detailed description of the invention
Fig. 1 is observation point direction across bridge arrangement schematic diagram；
Fig. 2 is observation point along bridge to arrangement schematic diagram；
Fig. 3 is that Tong Kuai preloading area, steel strand wires preloading area and the water filling area that the present invention marks off on rack template locally show
It is intended to；
Fig. 4 is partial cross-sectional view of the preloading load of the present invention along diaphragm plate；
Fig. 5 is that water filling of the invention is loaded along direction across bridge partial cross-sectional view.
Specific embodiment
With reference to embodiments and attached drawing is illustrated implementation process of the invention.
Certain grand bridge of applicant's construction is the mixing cast-in-place segment length of girder stayed-cable bridge end bay, and width of main beam list case section is big, two
Hold jib-length long, Cast-in-Situ Segment is from great, and difficulty of construction is big, requires for steel pipe support high thus pre- using this steel pipe support
Pressure technique is verified.
End bay Cast-in-Situ Segment does not carry out precompressed to wing plate, skew web plate.Prefabricating load test material uses concrete block, steel strand wires and storage
Water collective effect, operating condition when simulating concrete placings are loaded.The big concrete block of load is calculated according to 2.4t/ block, and small concrete block is pressed
According to 1t/ block meter, steel strand wires average weight is 3.8t/ bundle, steel strand wires diameter 1.3m, height 0.75m.
Make lifting equipment using crane, first carries out diaphragm plate and vertical web position preloading Prefabricated Concrete block precompressed, then in concrete block
Between be laid with monolith canvas, injected clear water as top, bottom plate precompressed counterweight.
Due to the influence that solar temperature deforms steel construction, in order to accurately measure deformation of timbering value, select as far as possible in the morning
5:30~7:30 and the evening 5:30~7:00 temperature difference lesser period carry out deformation observation.
By taking the pre-pressing bracket of the cast-in-place beam section of this bridge 0# block as an example, specific pre-compaction process is as follows:
(1) observation point is arranged: as shown in Figure 1 and Figure 2, in 1 top surface of bracket, direction across bridge is in concrete box girder 2 to be poured
Every vertical 3 design position of web is respectively arranged below an observation point 4, and observation point indulges bridge to being arranged one every being no more than 5m；
In the present embodiment, direction across bridge is provided with 4 observation points, indulges bridge to being arranged 8 observation points under every vertical web, and totally 32.Branch
After frame cope plate 5 is laid with, removes all temporary load(ing)s in template 5 and measured in the case where zero load by each observation point
Absolute altitude before the non-precompressed of bracket 1.
(2) pre-treatment is loaded:
(21) template surface sundries has been cleared up, water-proofing treatment has been carried out between piece each plate of template, it is ensured that water-tight；
(22) it is released in each section of diaphragm plate of concrete box girder to be poured and vertical web as shown in figure 3, being measured in template
Heart line；Tong Kuai preloading area 6 is marked off along diaphragm plate, marks off steel strand wires preloading area 7 along vertical web, diaphragm plate and vertical web enclose
Region be water filling area 8；
(3) load: load is divided into 5 ranks, carries out classification pressure testing according to 25%, 50%, 75%, 100%, 110%；Add
Load mode is that preloading concrete block and steel strand wires and water filling, concrete mode are as follows；
(31) as shown in figure 4, according to diaphragm plate middle line and vertical web center line that measurement is released, along tabula Board position preloading
Concrete block 9, while along vertical web position preloading steel strand wires 10；
(32) as shown in figure 5, being laid with canvas in water filling area, each water filling area is all made of whole seamless canvas and is laid with, inspection
Looking into ensures that water leakage defect is not present in canvas；When concrete block and steel strand wires heap are downloaded to certain altitude, canvas periphery is ridden over into preloading
It at the top of concrete block and steel strand wires and compresses, synchronization fills the water 11 into each water filling area；
(33) by step (31), the construction of (32) circulation, until being loaded into design maximum load；
(4) bracket absolute altitude is observed: often being reached a load rank in loading procedure, is carried out by observation point to bracket absolute altitude
Observation, and hourly observation data；After 4 grades every grade of load of front adds, interval carries out deformation of timbering observation after 30 minutes；Reach most
It is primary every observation in 24 hours after height load rank, when each observation point settling amount mean difference is less than 1mm, or continuously survey three times
When point settling amount average value is less than 5mm, that is, meets unloading condition, can start to unload；
(5) unload: uninstall process and loading procedure sequence are on the contrary, simultaneously load shedding；When reaching each load rank
It is observed record, and is compared with load record；
(6) it is recorded according to loading and unloading, analyzes the elasticity and inelastic deformation specific value of bracket, bracket mark is adjusted with this
Up to mould absolute altitude value.
In the above process, in preloading concrete block, the preloading area of concrete block be along each 0.5m range of diaphragm plate middle line or so, and by
Span centre is to two sides preloading；Concrete block upper and lower level stacks, and forms concrete block partition wall and ensures that partition wall is stablized.
To guarantee that the lateral pressure of water after filling the water is unlikely to overthrow on concrete block partition wall, against concrete block partition wall root, heap sets several layers of sand
Bag forms inequilateral trapezoidal shape to offset the lateral pressure of water, or with flitch and does simple support to concrete block partition wall.
When preloading steel strand wires, the preloading area of steel strand wires is along each 0.5m range of vertical web middle line or so, and upper and lower level stacks simultaneously
Ensure that heap carrier is stablized；Steel strand wires preloading sequence is according to the arrangement principle in side, from inside to outside, i.e., first along in box beam
Between position vertical web preloading, then successively web position preloading is indulged to two sides, when web steel strand wires are each indulged in preloading in elder generation's preloading
Side is again on the outside of preloading.
When water filling, to the case where there are deck profile grades, the highest and lowest water level for filling the water area has head difference, sounds the depth of the water
When should take lowest water level control water filling height.
The observation of bracket absolute altitude specifically includes that each steel pipe pile foundation sedimentation value；Downwarp value at each row's steel-pipe pile top template；It holds
The downwarp of position in weight girder span.
Following table is the observed result in the present embodiment, after maximum prefabricating load is reached to 0# block bracket:
According to the deformation of timbering value accurately measured in pre-compaction process, determine generation in beam section load action lower bracket
Flexible deformation value and foundation elasticity sinking will be proposed in this flexible deformation value, setting of ground value and Construction control because other
Factor superposition, calculates the camber that should be used when construction, adjusts bracket absolute altitude by the camber of calculating.
According to the deformation of timbering value of actual measurement, in conjunction with designed elevation, beam bottom mould absolute altitude is determined and adjusted.Beam bottom mould absolute altitude
=design bottom elevation+rack elasticity deformation values.
Claims (5)
1. a kind of mixing girder stayed-cable bridge concrete box girder steel pipe support joint preloading method, it is characterised in that the following steps are included:
(1) observation point is arranged: in cradle top surface, direction across bridge is under concrete box girder every vertical web design position to be poured
An observation point is respectively set in side, and observation point indulges bridge to every no more than 5m setting one；After bracket cope plate is laid with, remove
All temporary load(ing)s in template measure the absolute altitude before the non-precompressed of bracket by each observation point in the case where zero load；
(2) pre-treatment is loaded:
(21) template surface sundries has been cleared up, water-proofing treatment has been carried out between piece each plate of template, it is ensured that water-tight；
(22) each section of diaphragm plate of concrete box girder to be poured and vertical web center line are released in measurement in template；It is drawn along diaphragm plate
Tong Kuai preloading area is separated, marks off steel strand wires preloading area along vertical web, the region that diaphragm plate and vertical web enclose is water filling area；
(3) load: load is divided into 5 ranks, carries out classification pressure testing according to 25%, 50%, 75%, 100%, 110%；Load side
Formula is that preloading concrete block and steel strand wires and water filling, concrete mode are as follows；
(31) the diaphragm plate middle line and vertical web center line released according to measurement, along tabula Board position preloading concrete block, while along vertical
Web position preloading steel strand wires；
(32) canvas is laid in water filling area, each water filling area is all made of whole seamless canvas and is laid with, and inspection ensures that canvas is not deposited
In water leakage defect；When concrete block and steel strand wires heap are downloaded to certain altitude, canvas periphery is ridden over to concrete block and the steel strand wires top of preloading
Portion simultaneously compresses, and synchronization is filled the water into each water filling area；
(33) by step (31), the construction of (32) circulation, until being loaded into design maximum load；
(4) bracket absolute altitude is observed: often reach a load stage in loading procedure, bracket absolute altitude is observed by observation point,
And hourly observation data；After 4 grades every grade of load of front adds, interval carries out deformation of timbering observation after 30 minutes；Reach highest to add
It is primary every observation in 24 hours after carrying grade load, when each observation point settling amount mean difference is less than 1mm, or continuous measuring point three times
When settling amount average value is less than 5mm, that is, meets unloading condition, can start to unload；
(5) unload: uninstall process and loading procedure sequence also carry out when reaching each load rank on the contrary, simultaneously load shedding
Observational record, and compared with load record；
(6) it is recorded according to loading and unloading, analyzes the elasticity and inelastic deformation specific value of bracket, bracket absolute altitude is adjusted extremely with this
Mould absolute altitude value.
2. mixing girder stayed-cable bridge concrete box girder steel pipe support joint preloading method according to claim 1, feature exist
In: when preloading concrete block, the preloading area of concrete block is along each 0.5m range of diaphragm plate middle line or so, and from span centre to two sides preloading；Concrete
Block upper and lower level stacks, and forms concrete block partition wall and ensures that partition wall is stablized.
3. mixing girder stayed-cable bridge concrete box girder steel pipe support joint preloading method according to claim 2, feature exist
In: the lateral pressure of water is unlikely to overthrow on concrete block partition wall after for guarantee water filling, and against concrete block partition wall root, heap sets several layers of sandbags, shape
The lateral pressure of water is offset at inequilateral trapezoidal shape, or simple support is done to concrete block partition wall with flitch.
4. mixing girder stayed-cable bridge concrete box girder steel pipe support joint preloading method according to claim 1, feature exist
In: when preloading steel strand wires, the preloading area of steel strand wires is along each 0.5m range of vertical web middle line or so, and upper and lower level stacks and ensures heap
Carrier is stablized；Steel strand wires preloading sequence is according to the arrangement principle in side, from inside to outside, i.e., first along positioned at box beam middle position
Vertical web preloading, then successively indulge web position preloading to two sides, heap again on the inside of elder generation's preloading when web steel strand wires are each indulged in preloading
Carry outside.
5. mixing girder stayed-cable bridge concrete box girder steel pipe support joint preloading method according to claim 1, feature exist
In: when water filling, to the case where there are deck profile grades, the highest and lowest water level for filling the water area has head difference, answers when sounding the depth of the water
Take lowest water level control water filling height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969331.4A CN108978483B (en) | 2018-08-23 | 2018-08-23 | Combined prepressing method for concrete box girder steel pipe support of hybrid beam cable-stayed bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969331.4A CN108978483B (en) | 2018-08-23 | 2018-08-23 | Combined prepressing method for concrete box girder steel pipe support of hybrid beam cable-stayed bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108978483A true CN108978483A (en) | 2018-12-11 |
| CN108978483B CN108978483B (en) | 2020-03-10 |
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|---|---|---|---|
| CN201810969331.4A Active CN108978483B (en) | 2018-08-23 | 2018-08-23 | Combined prepressing method for concrete box girder steel pipe support of hybrid beam cable-stayed bridge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441307A (en) * | 2021-12-29 | 2022-05-06 | 中铁二十局集团有限公司 | Support pre-pressing method |
| CN114809703A (en) * | 2022-05-24 | 2022-07-29 | 中建二局第三建筑工程有限公司 | Column-drawing conversion reinforcing structure and construction method thereof |
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| CN103437291A (en) * | 2013-08-02 | 2013-12-11 | 中交二公局第一工程有限公司 | Integral water tank preloading construction process |
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| CN106400689A (en) * | 2016-09-13 | 2017-02-15 | 陈凯 | Sealed water bag prepressing construction technology |
| CN107201827A (en) * | 2016-03-16 | 2017-09-26 | 中铁十五局集团有限公司 | Pre-pressing bracket construction method based on settlement observation |
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| KR20080083374A (en) * | 2007-03-12 | 2008-09-18 | (주)삼현피에프 | Prestressed temporary bridge preloaded by cable-tie and method thereof |
| CN103437291A (en) * | 2013-08-02 | 2013-12-11 | 中交二公局第一工程有限公司 | Integral water tank preloading construction process |
| CN105155425A (en) * | 2015-09-22 | 2015-12-16 | 深圳市市政工程总公司 | Fluid analogue simulation preloading construction method of full framing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114441307A (en) * | 2021-12-29 | 2022-05-06 | 中铁二十局集团有限公司 | Support pre-pressing method |
| CN114809703A (en) * | 2022-05-24 | 2022-07-29 | 中建二局第三建筑工程有限公司 | Column-drawing conversion reinforcing structure and construction method thereof |
| CN114809703B (en) * | 2022-05-24 | 2023-03-10 | 中建二局第三建筑工程有限公司 | Column-pulling conversion reinforcing structure and construction method thereof |
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| CN108978483B (en) | 2020-03-10 |
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