CN101824810B - Method for protecting river bank by sand-river pile group and flexible mattresses - Google Patents
Method for protecting river bank by sand-river pile group and flexible mattresses Download PDFInfo
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- CN101824810B CN101824810B CN2010101424525A CN201010142452A CN101824810B CN 101824810 B CN101824810 B CN 101824810B CN 2010101424525 A CN2010101424525 A CN 2010101424525A CN 201010142452 A CN201010142452 A CN 201010142452A CN 101824810 B CN101824810 B CN 101824810B
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Abstract
The invention discloses a method for protecting the river bank by a sand-river pile group and flexible mattresses, which comprises the step of arranging flexible mattress protective structures along the banks of the river, and is characterized in that the pile group consisting of at least two rows of protective piles is also arranged outside the side edge of the river bed in which the flexible mattress protective structure is arranged and used for protecting the river bank. When the method is specifically implemented, the flexible mattress protective structure generally can extend to the position 8 to 17m under the underwater river bed, the protective piles adopt concrete square piles, the lower end of each concrete square pile is rooted in the position about 10m under the bottom of the river bed so as to make the protective pile keep stable, and the height of the upper end of each concrete square file exceeds the design flood level. In the method, the pipe group arranged in the river bed outside the flexible mattresses can make a downstream and dank effect, and make the flow velocity of the water greatly slow down after flowing through the pile group by the streaming function, thereby reducing the scouring capability of the water flow and avoiding the damage to the flexible mattresses so as to achieve good bank protection effect.
Description
Technical field
The present invention relates to the riparian protection technology, the method on especially a kind of fine sand river pile group-soft raft complex protection riverbank.
Background technology
At present, in the riparian protection field, the mode that has a kind of structure that adopts soft raft to protect do not influence water flow structure because of possessing, implement advantage such as convenient, that protection effect is better uses wider.Said soft raft safeguard structure mainly is made up of some concrete rectangular pieces; Adopt member such as hinge to combine as a whole between each rectangular block and cover must the riverbank of protection on; Usually end must be disposed to maximum stage line place, river to soft raft protection structure on the riverbank; In the riverbed, extend 8-17 rice distance, its river silt that can prevent the rectangular block below is taken away by current scour, plays the better protect effect.
Yet, in fine sand type river, because bed material is very thin; Impact resilience is low, thereby section big at some flow velocitys, that have plume and oblique impact current, and it is very big that river washes away dynamics to soft raft itself and following bed material; Often cause river soon the silt that soft raft is positioned at lateral edges place, riverbed below to be washed away; Formation is towards the dead zone, along with this scope towards the dead zone increases gradually, and the rectangular block that soft raft is positioned at riverbed side phenomenon such as can occur sinking, subside; And then cause situation such as arching upward appears in all the other position soft rafts, hinge bursts apart to occur, thereby destroy the globality of soft raft.After soft raft is destructurized, promptly cause the failure of bank protection.
So it is good how to design a kind of protection effect, the bank protection technology that is particularly suitable in fine sand type river, implementing promptly becomes the present technique field has a difficult problem to be solved.
Summary of the invention
Technical problem to be solved by this invention is: overcomes the deficiency of above-mentioned prior art, provides a kind of protection effect good, and the method on the fine sand river pile group-soft raft complex protection riverbank that is particularly suitable in fine sand type river, practicing.
In order to solve the problems of the technologies described above, adopted following technical scheme among the present invention:
The method on a kind of fine sand river pile group-soft raft complex protection riverbank; Comprise along river alongshore soft raft protection structure is set; Its characteristics are, outside said soft raft protection structure riverbed lateral edges, also are provided with the pile group that is made up of at least two row's protection stakes and protect.During practical implementation, generally can make the riverbed 8-17 rice distance beyond soft raft protection extensibility of structure to the riverbank, concrete square pile is adopted in the protection stake, and its lower end is rooted in about 10 meters of bottoms, riverbed can make it keep stable, and its upper end highly exceeds more than the design flood level.In addition, geotextiles is laid in soft raft below, prevents that water erosion from taking away fine sand.
In this method; The pile group that in the soft raft river bed outside, is provided with can make most river be blocked in it is gone downstream that the part current receive a clump of piles to stream the influence of resistance when passing pile group; Make the flow rate of water flow that sees through the protection stake slow down greatly; Be difficult to again soft raft and edge downside silt thereof produced and wash away more greatly, avoid soft raft because of washing away the destruction that produces, thereby the riverbank is reached the excellent protection effect.
As optimization, the pile group of setting can be made up of four row's protection stakes, and clear distance should not be greater than 3 times stake footpath between it.Show that according to patent applicant's result of study a clump of piles streams for the inhibition of current clearly, and pile spacing streams resistance to a clump of piles bigger influence is arranged, the pile group resistance coefficient reduces along with the increase of clear distance between stake.In the spacing of 0.5 times of stake footpath, resistance coefficient is maximum, surpasses when pile spacing after 3 times the stake footpath, and resistance coefficient is less, when the stake above 4 times directly the time, a clump of piles for the influence of current very a little less than, only be equivalent to single pile.But pile spacing is more little, washes away deeply more before the stake, and construction is also inconvenient, so from the protection effect, pile group self washes away and the construction aspect is considered, pile spacing directly is advisable with 3 times stake.Protection stake simultaneously is not restricted to four rows; Its row's number can adjust according to the concrete river regime in section; The adjustment principle is to guarantee that reaching water impact speed is lower than soft raft safety eroding velocity, four row's protection stakes generally is set can reaches the better protect effect.
As another optimization, said pile group is provided with the position makes soft raft and pile group sides adjacent be positioned at just outside the maximum erosion hole, pile group rear end.This is because when current are excessive; Can before and after it, all form scour hole to protecting the stake generation to wash away more greatly; River sand just scour hole backfill again when current weaken; So make soft raft and pile group sides adjacent be positioned at just outside the maximum erosion hole, pile group lower end when pile group is provided with the position, then can avoid this scour hole that soft raft is impacted.The said position that specifically is provided with can be calculated according to following formula.
D
b＝1.4B
b 0.76 (1)
Each symbol implication is in this formula: D
bScour hole width (m) behind-clump of piles, B
bThe scour hole degree of depth (m) behind-clump of piles.
Can't learn under the parameter situation, between pile group and the soft raft distance general desirable about 5 meters comparatively suitable.
As further optimization, said pile group upper end is connected as a single entity.Like this, can make whole pile group hold together, strengthen the steadiness and the impact resistance of pile group greatly.During practical implementation, can adopt linking beam or cement panel that the pile group upper end is connected as a single entity, but linking beam or cement panel upper surface should be higher than the river design flood level.
In sum, than prior art, this method possesses following advantage:
1, adopted the compound mode of pile group and soft raft that the riverbank is protected in the inventive method; Soft raft can protect the riverbed silt that closes on the place, riverbank not to be flushed away; The river flow velocity that pile group assurance simultaneously arrives the soft raft side is in safe range; And then guaranteed the safety of soft raft self, so possess the effective advantage of protection, be particularly suitable for that flow velocity section big, that oblique impact is many practices in fine sand type river.
2, the pile group in this method is not to stop current to pass through rigidly; But allow current after reducing flow velocity, can pass through therebetween; This with prior art in other like preventive means such as soft raft, sandbag, groynes in essence different are arranged; These existing preventive means all are to hope to isolate the contact of living between object to be protected and the current, tend to cause and protect structure self because of bigger the washing away of generation destroys, and can not reach the protection purpose.And in this method, pile group belongs to permeable structure, current is played simultaneously the effect of dredging and cushioning; Reduced washing away of pile group self on the one hand; Guarantee the safety of structure self, significantly slowed down the water velocity behind the pile group on the other hand, protected the safety of riverbank or other protection object.
3, in this method, not only announce the method that adopts its buffering river of pile group, announced that also concrete pile group is provided with layout structure, can make that pile group is maximized to play the effect that slows down the river flow velocity, also farthest guaranteed pile group self steadiness simultaneously.
So in sum, it is respond well that this method possesses protection, is particularly suitable for the characteristics of in fine sand type river, implementing.
The specific embodiment
Below in conjunction with the specific embodiment the present invention is done further detailed description.
The method on a kind of fine sand river pile group-soft raft complex protection riverbank is provided with soft raft protection structure along river alongshore earlier, and soft raft needs to lay geotextiles down and covers the riverbed face; Again outside said soft raft protection structure riverbed lateral edges; Also being provided with the pile group that is made up of four row's protection stakes protects; Said soft raft protection extensibility of structure is the 12 meters distances in riverbed extremely under water; Concrete square pile is adopted in the protection stake, and its lower end is rooted in 12 meters of bottoms, riverbed makes it keep stable, and its upper end highly exceeds design water level.Adopt staggered mode in the pile group that is provided with between every campshed, clear distance is 3.0 times of stake footpaths between stake.Pile spacing in this scope can slow down effect preferably so that pile group reaches river speed, guarantees that the water velocity that reaches soft raft is lower than the soft raft safe speed.Simultaneously, the scour depth before and after the pile group is all little, and the stable said pile group that has guaranteed pile group self is provided with the position makes soft raft and pile group sides adjacent be positioned at just outside pile group lower end maximum erosion cheats.Said pile group upper end adopts cement beam or panel to connect, and the upper surface should be higher than river design standard flood level height.
Claims (4)
1. the method on fine sand river pile group-soft raft complex protection riverbank comprises along river alongshore soft raft protection structure is set, and it is characterized in that; Outside said soft raft protection structure riverbed lateral edges; Be provided with the pile group that constitutes by at least two row's protection stakes again and protect, the riverbed 8-17 rice distance beyond soft raft protection extensibility of structure to the riverbank, concrete square pile is adopted in the protection stake; Its lower end is rooted in about 10 meters of bottoms, riverbed makes it keep stable, and its upper end highly exceeds design flood level.
2. the method on fine sand as claimed in claim 1 river pile group-soft raft complex protection riverbank is characterized in that, the pile group of setting is made up of four row's protection stakes, and clear distance is not more than 3 times stake footpath between it.
3. the method on fine sand as claimed in claim 1 river pile group-soft raft complex protection riverbank is characterized in that, said pile group is provided with the position makes soft raft and pile group sides adjacent be positioned at just outside the maximum erosion hole, pile group rear end.
4. like the method on claim 1 or 2 or 3 or 4 described fine sand river pile group-soft raft complex protection riverbanks, it is characterized in that said pile group upper end is connected as a single entity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101424525A CN101824810B (en) | 2010-04-08 | 2010-04-08 | Method for protecting river bank by sand-river pile group and flexible mattresses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101424525A CN101824810B (en) | 2010-04-08 | 2010-04-08 | Method for protecting river bank by sand-river pile group and flexible mattresses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101824810A CN101824810A (en) | 2010-09-08 |
| CN101824810B true CN101824810B (en) | 2012-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101424525A Expired - Fee Related CN101824810B (en) | 2010-04-08 | 2010-04-08 | Method for protecting river bank by sand-river pile group and flexible mattresses |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828489B (en) * | 2012-07-25 | 2015-07-22 | 中国水利水电科学研究院 | System for arranging piles to fix riverbed main stream |
| CN103603267B (en) * | 2013-11-21 | 2015-06-24 | 同济大学 | Protective device with height-variable sacrificing piles against local scours to bridge pier foundation |
| CN104213586B (en) * | 2014-09-18 | 2016-08-24 | 东南大学 | A kind of pile foundation scour safeguard procedures method |
| CN107090805A (en) * | 2017-02-07 | 2017-08-25 | 中国地质科学院探矿工艺研究所 | Method for protecting and reinforcing mud-rock flow sand blocking dam against scour |
| CN113094631B (en) * | 2021-04-16 | 2022-03-04 | 交通运输部天津水运工程科学研究所 | Large-range scouring pit optical fiber monitoring data processing method for end part of bank protection soft row body |
| CN114790716B (en) * | 2022-04-29 | 2023-09-01 | 华北水利水电大学 | Reservoir barrage sand treatment method based on movable diversion pile group |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2293594Y (en) * | 1997-04-30 | 1998-10-07 | 谢怀东 | Permeable breakwater pile foundation |
| CN1372043A (en) * | 2001-02-27 | 2002-10-02 | 龚崇准 | Permeable pile type offshore dam |
| CN1103396C (en) * | 2001-03-15 | 2003-03-19 | 南京市长江河道管理处 | Continuous prefabricated hinged concrete row drawing and depositing construction process |
| CN2698844Y (en) * | 2004-05-13 | 2005-05-11 | 长江航道规划设计研究院 | Soft raft tied with concrete block |
| CN2863884Y (en) * | 2005-12-16 | 2007-01-31 | 武汉绿洲凝石工程有限责任公司 | Thread connecting precast block soft row |
| CN2866593Y (en) * | 2006-07-25 | 2007-02-07 | 中国水利水电科学研究院 | System drainage combined anchorage structure for estuary soft body draining and protecting bank engineering |
| RU2338833C1 (en) * | 2007-01-11 | 2008-11-20 | Замир Галимович Ламердонов | Method of protection building against undermining of bank protection structures foundations |
| CN101581083B (en) * | 2009-06-12 | 2011-01-19 | 中交二航局第三工程有限公司 | Method for constructing composite river bottom protection with steel sheet piles and soft mattresses for artificial island |
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