CN103233429A - Construction method of local scour prevention of piers in water - Google Patents
Construction method of local scour prevention of piers in water Download PDFInfo
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- CN103233429A CN103233429A CN2013101740757A CN201310174075A CN103233429A CN 103233429 A CN103233429 A CN 103233429A CN 2013101740757 A CN2013101740757 A CN 2013101740757A CN 201310174075 A CN201310174075 A CN 201310174075A CN 103233429 A CN103233429 A CN 103233429A
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Abstract
The invention discloses a construction method of local scour prevention of piers in water. The construction method comprises the following steps of throwing cobblestones in bags with the thickness of 100 to 200 cm in front of a pile foundation construction bridge; throwing breakwater core stones with the thickness of 50 to 100 cm after achieving pouring of a pile foundation; and finally placing C-shaped dimension stones with the thickness of 100 to 200 cm. According to the construction method, a top surface of an expanded pier foundation eliminates the scouring force of partial downward water flow and horseshoe vortexes and then reduces the depth of scour pits around bridge piers. The effect of impact reduction is obvious particularly when the top surface of the expanded pier foundation is located at a bed surface of a river bed. The construction method of the local scour prevention of the piers in water has the advantages of being strong in maneuverability, low in labor intensity, convenient to use, easy to perform quality control, safe and environmentally friendly and capable of speeding up the construction progress and reducing the construction costs.
Description
Technical field
The present invention relates to a kind of job practices, relate to the job practices of the anti-local scour of pier in a kind of water specifically.
Background technology
Local scour in the alluviation river around the bridge pier almost is a unavoidable problem, near the incision phenomenon of the local riverbed bed surface this bridge pier, it is caused normally to separate the high-intensity flow turbulence and the vortex system that produce by the three dimensional boundary layer of bridge pier ambient water, is related to the stable of bridge foundation.Therefore, bridge design worker must consider to take some preventive works that the bed surface around the bridge pier is carried out the river bottom protection protection, to guarantee the safety and stablization of bridge pier when carrying out the bridge foundation design.Up to now, the local scour near pier preventive works be always prevent that bed surface washes away around the bridge pier in the riverbed, one of the important measures of bridge pier unstability and bridge disaster by flood.
The entity anti-impact preventive works measure that Recent study is crossed mainly enlarges pier footing protection, concrete hinge row protection, the protection of fill concrete mould bag, tetrapod protection and the protection of A-JACKS element of construction etc.; Slow down not towards the preventive works measure, a part or whole part that mainly comprises guard ring protection, bridge pier crack flood before campshed protection before protection, the pier, the pier flood that ground sill protects before aileron protection, the pier and pier before flood angle sill protection etc.But because traditional local scour near pier preventive works measure has certain use limitation and cost high, difficulty of construction is also bigger.
Summary of the invention
In order to solve problems of the prior art, the invention provides the job practices of the anti-local scour of pier in a kind of water, overcome local scour near pier preventive works cost height in the prior art, problem that difficulty of construction is big.
Technical scheme of the present invention is as follows:
The job practices of the anti-local scour of pier in a kind of water may further comprise the steps:
(1) packed " e " cobble 100cm-200cm is put in throwing before the pile foundation construction bridge;
(2) throw after pile foundation is built and finished and put a bed thickness 50-100cm dike cardiolith;
(3) place bed thickness 100cm-200cm " C " piece stone at last.
The packed cobble of described step (1)-(3), block stone layer laying scope be front and back 1500-2000cm along water (flow) direction apart from the bridge pier edge, left and right sides 1000-1500cm.
" e " cobble particle diameter is 4cm-10cm in the described step (1).
Dike cardiolith 10-100kg in the described step (2), particle diameter is less than 35cm.
" C " piece stone 300-500kg in the described step (3), uniaxial compressive strength is not less than 50Mpa.
Described " C " piece stone is quartzite or gneiss.
Described packed " e " cobble adopts loop wheel machine to hang, and dike cardiolith and " C " piece stone use the pier footing scope outside to be driven the end ship of jettisoninging and throw and put, and adopts the loop wheel machine input of fixing a point in the pier footing scope.
Described packed " e " cobble is from one end to the other side successively put, and following current hangs in the process of putting.
The invention has the beneficial effects as follows: enlarge pier footing the end face dissipation scouring force of part current and horseshoe vortex downwards, and then cut down the scour hole degree of depth around the bridge pier, particularly when the end face that enlarges pier footing is positioned at bed surface place, riverbed just, subtract towards effect the most obvious.
1) because of the general richness in the operation waters stone of laying eggs, gather materials on the spot, the processing of piece stone is simple and easy, with low cost.
2) jackstone convenient and quick construction can adopt and throw the end of undocking out and jettisoning, but the reduction of erection time.The logical bridge of Soviet Union also adopts throwing to undock and jettisonings.
3) can adapt to water-bed landform and change, protection effect is good.
4) can reduce adverse effect to the waters, be beneficial to environmental protection
In sum, the present invention is workable, and labour intensity is low, and is easy to use, is easy to quality control, and safety and environmental protection can accelerating construction progress, reduces construction cost.
Description of drawings
Fig. 1 is protection against erosion floor map of the present invention;
Fig. 2 is protection against erosion profile of the present invention;
Among the figure: 1, pier footing, 2, pile foundation, 3, the protection against erosion scope, 4, packed " e " cobble, 5, the dike cardiolith, 6, " C " piece stone.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
Material requirements:
(1) worker knits the bag material requirement
According to the particular conditions requirement, the ground worker knits bag material and should be polyethylene fibre, polypropylene fibre or polyester fiber etc., and this land used worker of engineering construction institute knits bag, and the pack aspect ratio is preferably 2.0m*1.0m*1.25m, and the pack volume is preferably, and volume is pressed 1m
3～3m
3Its physical property should meet following table defined standard:
| Project | Unit | The result |
| Tension strength | kn/m | >70 |
| Elongation per unit length before damaged | % | <30 |
| Permeable is Number | cm/sec | >1×10-2 |
| Ultra-violet resistance | ? | Ultraviolet ray carbon arc lamp Continuous irradiation 200 hours |
(2) e cobble material requirements
According to the particular conditions requirement, e cobble stone matter must be closely knit, hard, and its strong degree is good with durability, and shape Like is circular or oval; Must not contain land waste matter and elongated or flat building stones.Particle diameter is 4cm-10cm.
(3) dike cardiolith and " C " piece stone
Dike cardiolith 10～100kg, its particle diameter be less than 35cm, " C " piece stone 300～500kg, stone matter must be closely knit hard, durability is good, must not contain land waste matter and elongated or flat building stones, and quartzite, gneiss etc. should be paid the utmost attention in igneous rock, basalt and the metamorphic rock.Uniaxial compressive strength is not less than 50Mpa.
See also Fig. 1～Fig. 2, concrete construction sequence is as follows
(1) measurement and positioning
Measurement and positioning adopts on fixedly measuring point measurement and the ship GPS to move measuring point and is measured as the master.Fixedly measuring point is to set steel pipe pile in water, and top welding steel plate is as the measuring point platform.In entire job platform and gantry work progress, use as fixation measuring control point and basic point.GPS moves measuring point, is to adopt the GPS measuring instrument, mobile dispensing survey mark.
This construction employing GPS moves to be put a little, throws to put buoy and mark post sign boundary of works area.Consider job site and trend situation, should note when measuring construction following some:
When 1. adopting GPS measuring instrument dispensing control point, should be near the control point grappling surveying vessel, discharge the control point then.Check the control point with total powerstation in fixed base point, if control point errorless then sinking buoy and mark post.
2. buoy should adopt the 50cm*50cm*50cm concrete precast block as the heavy thing that weighs down, and for floating cable, and length of warping winch should not surpass mean tide tlevel 1.5m with thin tightwire.With the polyethylene floating drum as the buoy label, and when guaranteeing high water mark, the buoy head can exposure in the water surface.Mark post adopts the 200kg collet, long, Φ 48 steel pipes of top welding 25m, and brushing reddish yellow alternate reflectorised paint in top also hangs alarm flag.
3. sinking buoy and mark post are appropriate to the occasion at high water mark or low tide, carry out when trend is stablized.
4. in the construction operation process, the mode of fixed base point measurement and GPS traverse measurement of can using is checked at any time to the boundary of works area of buoy and mark post institute mark.Guaranteeing that buoy and mark post can access timely correction in the error that the marked region that influenced by trend to cause down moves forward and backward, thereby guarantee that the bottom applies etc. to guarantee both quality and quantity, to carry out smoothly.
(2) packed cobble is thrown and is put
This construction mainly is for layer of sand and flour sand layer around protecting under the bridge pier can not washed away by disturbance, has also increased the stability of steel sleeve and job platform, gantry steel pipe pile simultaneously.
1. the early-stage preparations of constructing
A, inspection ground worker knit bag, and ground worker's bag will meet relevant regulations in the particular conditions, need before construction to check whether have breakage, whether have the tension survey report if knitting bag.
B, inspection e cobble, the cobble size is should satisfy 4cm to the particle diameter of 10cm.Check whether the cobble surface is smooth, stops land waste, do not meet the piece stone of design specifications and quality requirement.
C, inspection operation drawing and boundary of works area check the operation drawing before the construction, calculate the good material consumption, carry out the construction information preparation.Check boundary of works area, check whether accurate positioning such as buoy.
2. the geotechnique knits packed filling out
To meet the cobble of above-mentioned material requirement and ground worker knits bag and is transported to nearer operation harbour.During the filling cobble, each ground worker knits bag should fill eight fens completely, and aspect ratio is controlled at 2.0m*1.0m*0.5m.Pack should be used after finishing with to knit bag solid with the colligation of material binding strap, avoids cobble to run off.
3. packed cobble e cobble transportation
The ground worker knits bag after the harbour filling is finished, and handling is transported to the job location grappling then to the barge of constructing.
4. the worker knits the lifting of bag and piles up
A, the barge of will constructing (the ground worker that 1000t is equipped with cobble knits bag) and construction are hung ship (the 1000t barge cooperates the 80t crawler crane) and are moved to construction location.
B, hang the ground worker that the e cobble is housed with crane and knit bag, should carry out the suspension ring survivor of a murder attempt during lifting, convenient dismounting under water.
When c, lifting, need there be two divers' cooperations to put the ground worker under water and knit bag.Need waterborne are by a commanding and the diver keeps in communication and in time notify hoistman adjustment lifting position.
D, knit in the bag lifting entry process the ground worker, the diver needs to keep certain safe distance with suspension hook, treat that crane hangs onto assigned address after, the diver just carries out next step the construction of piling up.
E, knit bag the ground worker and hang in the process, the ground worker knits bag and should from one end to the other side successively put, and answers following current to hang in the process of putting.When namely lifting, the diver is positioned at the ocean current upstream, and the ground worker knits bag and goes downstream from the ocean current upstream and to hang.Should in time adjust construction direction when rising tide, ebb tide, lifting should keep going downstream always, guarantees construction safety and progress.
F, the worker knit bag pile up should be with mutually near being principle, knitting a bag stacked arrangement mode with one deck ground worker should be identical, up and down two layers of ground worker knit bag pile up should be crisscross clearly.
5. the leveling of geotextile bag
A, stacking ground worker should be familiar with sea-floor relief earlier before knitting bag, make topographic map.Knitting bag according to topographic map calculating ground worker piles up the number of plies and piles up order.
At any time stacked the ground worker with the bigness scale of lining rope weight in b, the stacking process and knitted a bag scope, carried out record, according to the adjustment of record deviation.
C, production standard measuring staff, measuring staff arrange 18 meters long, bottom weld diameter 50cm tray, and Sopwith staff is measured in the top colligation.When the ground worker knits bag levelling, can send diver's mobile measuring staff under water, aquatic measurement personnel auxiliary moving, and monitor top Sopwith staff elevation situation of change at any time, in time record.
D, in measuring process, occur bigger than normally, should send under the diver water to be felt.Find out after deviating cause, deviation range and ground worker knit bag and pile up situation, in time adjust.
Because preventing geotextile bag damages, adopt the diving personnel to join hanging device and throw and put, dike cardiolith and " C " piece stone use the pier footing scope outside to be driven the end ship of jettisoninging and throws and put, and adopts the loop wheel machine input of fixing a point in the pier footing scope, program is no longer carefully stated with packed " e " cobble.
Although by reference to the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (8)
1. the job practices of the anti-local scour of pier in the water is characterized in that, may further comprise the steps:
(1) packed " e " cobble 100cm-200cm is put in throwing before the pile foundation construction bridge;
(2) throw after pile foundation is built and finished and put a bed thickness 50-100cm dike cardiolith;
(3) place bed thickness 100cm-200cm " C " piece stone at last.
2. according to the job practices of the anti-local scour of pier in the described water of claim 1, it is characterized in that the packed cobble of described step (1)-(3), block stone layer laying scope be front and back 1500-2000cm along water (flow) direction apart from the bridge pier edge, left and right sides 1000-1500cm.
3. according to the job practices of the anti-local scour of pier in the described water of claim 1, it is characterized in that " e " cobble particle diameter is 4cm-10cm in the described step (1).
4. according to the job practices of the anti-local scour of pier in the described water of claim 1, it is characterized in that, dike cardiolith 10-100kg in the described step (2), particle diameter is less than 35cm.
5. according to the job practices of the anti-local scour of pier in the described water of claim 1, it is characterized in that, " C " piece stone 300-500kg in the described step (3), uniaxial compressive strength is not less than 50Mpa.
6. according to the job practices of the anti-local scour of pier in the described water of claim 4, it is characterized in that described " C " piece stone is quartzite or gneiss.
7. prevent the job practices of local scour according to pier in the described water of claim 1, it is characterized in that, described packed " e " cobble adopts loop wheel machine to hang, and dike cardiolith and " C " piece stone use the pier footing scope outside to be driven the end ship of jettisoninging and throw and put, and adopts the loop wheel machine input of fixing a point in the pier footing scope.
8. according to the job practices of the anti-local scour of pier in the described water of claim 1, it is characterized in that described packed " e " cobble is from one end to the other side successively put, and following current hangs in the process of putting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013101740757A CN103233429A (en) | 2013-05-11 | 2013-05-11 | Construction method of local scour prevention of piers in water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101740757A CN103233429A (en) | 2013-05-11 | 2013-05-11 | Construction method of local scour prevention of piers in water |
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| CN103233429A true CN103233429A (en) | 2013-08-07 |
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| CN2013101740757A Pending CN103233429A (en) | 2013-05-11 | 2013-05-11 | Construction method of local scour prevention of piers in water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603267A (en) * | 2013-11-21 | 2014-02-26 | 同济大学 | Protective device with height-variable sacrificing piles against local scours to bridge pier foundation |
| CN108411802A (en) * | 2018-05-30 | 2018-08-17 | 扬州大学 | A kind of underwater method for repairing pile foundation and scour hole |
| CN108442326A (en) * | 2018-05-22 | 2018-08-24 | 同济大学 | A kind of means of defence sacrificed pile group and combine resistance pier footing local scour with river bottom protection jackstone |
Citations (5)
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|---|---|---|---|---|
| WO2003035986A1 (en) * | 2001-10-26 | 2003-05-01 | Lee, Byung-Moo | Method for constructing scour protection of bridge and stabilization of stream bed using block mat |
| JP3696389B2 (en) * | 1997-10-31 | 2005-09-14 | キョーワ株式会社 | Scouring prevention materials and scouring prevention methods for underwater structures |
| CN200967925Y (en) * | 2006-11-22 | 2007-10-31 | 李文正 | Improved structure of bridge abutment |
| KR100982023B1 (en) * | 2008-03-14 | 2010-09-13 | 조덕래 | Apparatus for preventing scour on bridge pier foundation |
| CN102127904A (en) * | 2011-01-31 | 2011-07-20 | 上海交通大学 | Modular reticular bedding and washing-out-preventing method using same |
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2013
- 2013-05-11 CN CN2013101740757A patent/CN103233429A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3696389B2 (en) * | 1997-10-31 | 2005-09-14 | キョーワ株式会社 | Scouring prevention materials and scouring prevention methods for underwater structures |
| WO2003035986A1 (en) * | 2001-10-26 | 2003-05-01 | Lee, Byung-Moo | Method for constructing scour protection of bridge and stabilization of stream bed using block mat |
| CN200967925Y (en) * | 2006-11-22 | 2007-10-31 | 李文正 | Improved structure of bridge abutment |
| KR100982023B1 (en) * | 2008-03-14 | 2010-09-13 | 조덕래 | Apparatus for preventing scour on bridge pier foundation |
| CN102127904A (en) * | 2011-01-31 | 2011-07-20 | 上海交通大学 | Modular reticular bedding and washing-out-preventing method using same |
Non-Patent Citations (1)
| Title |
|---|
| 雷江洪: ""苏通大桥主桥北塔墩基础冲刷防护施工"", 《施工技术（增刊）》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603267A (en) * | 2013-11-21 | 2014-02-26 | 同济大学 | Protective device with height-variable sacrificing piles against local scours to bridge pier foundation |
| CN108442326A (en) * | 2018-05-22 | 2018-08-24 | 同济大学 | A kind of means of defence sacrificed pile group and combine resistance pier footing local scour with river bottom protection jackstone |
| CN108411802A (en) * | 2018-05-30 | 2018-08-17 | 扬州大学 | A kind of underwater method for repairing pile foundation and scour hole |
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Application publication date: 20130807 |