CN103669375A - Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof - Google Patents
Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof Download PDFInfo
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- CN103669375A CN103669375A CN201310734833.6A CN201310734833A CN103669375A CN 103669375 A CN103669375 A CN 103669375A CN 201310734833 A CN201310734833 A CN 201310734833A CN 103669375 A CN103669375 A CN 103669375A
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Abstract
The invention discloses a double-layer steel sheet pile soil core composite cofferdam structure without an inner support and the application of the double-layer steel sheet pile soil core composite cofferdam structure without an inner support, and belongs to the field of water conservancy projects. The double-layer steel sheet pile soil core composite cofferdam structure without an inner support comprises an upstream-face steel sheet pile and a downstream-face steel sheet pile, and the space between the steel sheet piles is filled with cohesive soil to form a cofferdam; a composite geo-membrane is laid on the portion, inside the cofferdam, of the upstream-face steel sheet pile; the upper portions of the two steel sheet piles are connected through a pull rod, middle beams are arranged outside the steel sheet piles, and the pull rod is connected with the middle beams through bolts arranged outside the corresponding middle beams. When the filling cofferdam core cohesive soil is in the same level with the pull rod, the space between the steel sheet piles is further filled with a layer of hairy residues, and a sub-cofferdam is arranged on the upstream-face steel sheet pile. The cofferdam structure can be used for building strip-shaped subsurface structures in a river or lake through the open-cut method. The cofferdam structure is stable and safe, and the problem that a steel sheet pile flexible structure is large in deformation is solved by arranging the pull rod on the tops of the two steel sheet piles; a three-level waterproofing system improves the anti-penetrability performance of the steel sheet pile cofferdam significantly.
Description
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Technical field
The invention belongs to hydraulic engineering construction field, relate to a kind of without inner support clad steel sheet pile core combined cofferdam structure and application thereof.
Background technology
At present, steel sheet pile has application example very widely in China: steel sheet pile can be used for deepwater wharf, is specially adapted to the engineerings such as the dock wing wall of waterproof requirement and Retaining Wall of Shiplock; In dyke building, steel sheet pile can be used for impervious wall engineering, is the semiclosed or totally-enclosed seepage prevention system jointly being formed by the relative impervious layer below steel sheet pile, levee foundation pervious layer and geomembrane and upper overburden layer; In deep-foundation pit engineering, steel sheet pile forms enclosure wall, has good gear soil anti-permeability performance, good integrity, and there is the features such as intensity is high, combination is tight, speed is fast; In infiltration coffering, steel sheet-pile cofferdam generally adopts steel sheet-pile wall to add the support form of inner support, is generally divided into individual layer steel sheet-pile cofferdam and double steel sheet-pile cofferdam.
Steel sheet-pile cofferdam is a kind of typical flexible supporting structure, and larger distortion occurs in loading process, and it is directly related that this distortion and piling wall and steel sheet pile are connected tightness degree.For this flexible supporting structure that moderate finite deformation can occur, the relation of steel sheet pile and support system, very large on steel sheet-pile deformation impact, the stability that even can affect cofferdam system causes unstable failure.
Traditional double steel sheet-pile cofferdam, be more common in bridge foundation pile foundation construction, because cofferdam plane is less, and multiform squarely or circle, between steel sheet pile, adopt stull or diagonal brace can effectively strengthen the globality of steel sheet pile, but the method be not suitable for cofferdam, urban lakes tunnel.On the one hand cofferdam, urban lakes tunnel form mostly is overlength, super wide, monolateral strip structure, between steel sheet pile, adopt diagonal brace or stull can not effectively guarantee the long-time stability of steel sheet-pile cofferdam and steel sheet-pile deformation larger; On the other hand, adopt this steel sheet pile cofferdam structure form infiltration serious, can not meet engineering construction requirement.
Summary of the invention
The shortcoming that the object of the invention is to overcome prior art, with not enough, provides a kind of without inner support clad steel sheet pile core combined cofferdam structure.
The present invention also aims to provide the above-mentioned application without inner support clad steel sheet pile core combined cofferdam structure.
Object of the present invention is achieved through the following technical solutions:
Without an inner support clad steel sheet pile core combined cofferdam structure, comprise upstream face steel sheet pile and back side steel sheet pile (between steel sheet pile, by the mutual interlock of snap close, forming upstream face steel sheet pile and back side steel sheet pile), between steel sheet pile, fill cohesive soil and form cofferdam.In upstream face steel sheet-pile cofferdam inner side, lay impermeable composite geomembrane sealing.Between twice steel sheet pile, top adopts pull bar to connect, and steel sheet pile arranged outside has waist rail, and pull bar is with bolts by waist rail, and bolt is arranged on waist rail outside.When weir core cohesive soil fill with the same absolute altitude of pull bar after, then fill one deck hair slag, at upstream face steel sheet pile place, sub-cofferdam is set simultaneously.
Described comprises without inner support clad steel sheet pile core combined cofferdam structurally waterproof system: upstream face steel sheet-pile cofferdam first waterproof, in upstream face steel sheet-pile cofferdam inner side, lay the anti-formation second of composite geo-membrane waterproof, between the steel sheet pile of two sides, fill cohesive soil as San road waterproof.
Described steel sheet pile is preferably Larsen IV shaped steel plate pile.
The material of described pull bar is preferably 32 screw-thread steels.
The material of described waist rail is preferably 28b channel-section steel.
The above-mentioned construction method without inner support clad steel sheet pile core combined cofferdam structure, comprises following steps: first carry out both sides steel sheet pile and set, steel sheet pile is pressed pile head elevation control building-in depth, and each is arranged snap close between steel sheet pile and connects.The steel sheet pile construction complete upstream face steel sheet pile geomembrane that carries out in both sides hangs, and geomembrane adopts packeted soil to carry out bottom presser feet.Then carry out the construction of both sides steel sheet pile waist rail and pull bar, waist rail is arranged on steel sheet pile outside, and pull bar laterally links along cofferdam trend, and pull bar place steel sheet pile and waist rail need punching, with bolts between pull bar and waist rail.Finally carry out weir core and fill, when weir core cohesive soil fill with the same absolute altitude of pull bar after, then fill one deck hair slag, finally at upstream face steel sheet pile place, sub-cofferdam is set.
Above-mentionedly without inner support clad steel sheet pile core combined cofferdam structure, in river or lake, adopt cut and cover method to build the application in the underground structure of strip.Described is the provisional dash space enclosing structure of building for building permanent installation without inner support clad steel sheet pile core combined cofferdam, so that at cofferdam internal drainage, excavation pit, builds building.Generally, after building has been built, directly remove.
The present invention has the following advantages and effect with respect to prior art tool: the present invention strengthens by stull or diagonal brace at the double steel sheet-pile cofferdam of tradition without inner support clad steel sheet pile core combined cofferdam structure in the mode of its intensity and improves, its advantage is, by clad steel sheet pile top, pull bar is set, and bilateral plate fixation stake is formed to integral body by enclosing purlin pull bar.When being subject under extraneous load action, both sides steel sheet pile forms cooperative transformation, solves the larger problem of steel sheet pile flexible structure distortion; This cofferdam structure adopts core combining form simultaneously, and at upstream face steel sheet pile, waterproofing geomembrane is set, form three road waterproofing systems, efficiently solve the actual conditions that steel sheet-pile cofferdam very easily seeps water, improved significantly steel sheet-pile cofferdam anti-permeability performance, and inside, cofferdam fill cohesive soil form with both sides steel sheet pile together with Integral Steel sheet pile wall, larger raising resistance to overturning and the safety of steel sheet-pile cofferdam; In upstream face steel sheet pile side, with cohesive soil, form sub-cofferdam, further strengthen the stability of upstream face steel sheet pile.
Accompanying drawing explanation
Fig. 1 is that the present invention is without the schematic cross-sectional view of inner support clad steel sheet pile core combined cofferdam structure;
Fig. 2 is that the present invention is without the floor map of inner support clad steel sheet pile core combined cofferdam structure;
Fig. 3 be in embodiment 3 without the inner support clad steel sheet pile concrete schematic diagram of core combined cofferdam (cross section), the length in figure or parasang are m;
Fig. 4 be in embodiment 3 without the inner support clad steel sheet pile concrete schematic diagram of core combined cofferdam (plane), the length in figure or parasang are mm;
In accompanying drawing, 1-upstream face steel sheet pile, 2-back side steel sheet pile, 3-composite geo-membrane, 4-pull bar, 5-waist rail, 6-cohesive soil, 7-hair slag, 8-cofferdam, 9-bolt.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to further detailed description, but embodiments of the present invention are not limited to this.
Embodiment 1
A kind of without inner support clad steel sheet pile core combined cofferdam structure, its schematic diagram as illustrated in fig. 1 and 2, comprise between upstream face steel sheet pile 1 and back side steel sheet pile 2(steel sheet pile and form upstream face steel sheet pile 1 and back side steel sheet pile 2 by the mutual interlock of snap close), between steel sheet pile (1 and 2), fill cohesive soil and form cofferdam.In upstream face steel sheet pile 1 inner side, cofferdam, lay composite geo-membrane 3 water seepage preventions.Between twice steel sheet pile (1 and 2), top adopts pull bar 4 to connect, and steel sheet pile (1 and 2) arranged outside has waist rail 5, and pull bar 4 adopts bolt 9 to connect by waist rail 5, and bolt 9 is arranged on waist rail 5 outsides.When weir core cohesive soil 6 fill with the same absolute altitude of pull bar 4 after, then fill one deck hair slag 7, at upstream face steel sheet pile 1 place, sub-cofferdam 8 is set simultaneously.
Described steel sheet pile is preferably Larsen IV shaped steel plate pile, and the material of pull bar is preferably 32 screw-thread steels, and the material of waist rail is preferably 28b channel-section steel.
Embodiment 2
Without inner support clad steel sheet pile core combined cofferdam structure, first carry out both sides Larsen IV shaped steel plate pile and set, steel sheet pile is pressed pile head elevation control building-in depth, and each is arranged snap close between steel sheet pile and connects.The steel sheet pile construction complete upstream face steel sheet pile waterproofing geomembrane that carries out in both sides hangs, and geomembrane adopts packeted soil to carry out bottom presser feet.Then carry out the construction of both sides steel sheet pile waist rail and pull bar, waist rail is arranged on steel sheet pile outside, and pull bar adopts 32 screw-thread steels laterally to link by 1.6m along cofferdam strike separation, and outside adopts 28b channel-section steel waist rail, pull bar place steel sheet pile and waist rail need punching, with bolts between pull bar and waist rail.Finally carry out weir core and fill, adopt the poor cohesive soil of water proofing property, when weir core cohesive soil fill with the same absolute altitude of pull bar after, then fill one deck hair slag, finally at upstream face steel sheet pile place, sub-cofferdam is set.
Embodiment 3
To in Wuhan East Lake Channel Engineering, build without inner support clad steel sheet pile core combined cofferdam structure applications.East Lake Channel Engineering planning is docked with two loop wire water eastern sections North gets two loop wire red temple grade separations, and south terminates in analogy man road junction, North Road, Lu Yujia mountain, lake, approximately 10.6 kilometers of total lengths, and wherein in lake, length of tunnel is about 4.94 kilometers.Stage casing, lake, tunnel adopts steel sheet-pile cofferdam and two kinds of form of structure of earth fill cofferdam.The one-sided total cofferdam of engineering length is about 8.05 kilometers, and wherein, without approximately 7.36 kilometers of inner support steel sheet-pile cofferdam length, the cofferdam gross area is about 550,000 m
2, cofferdam is 20～50m apart from tunnel structure outer edge distance, clear span 7m, and the distance between outer contour is 8m, weir body adopts cohesive soil to fill.
Adopt finite element analysis software ANSYS software to check the integral body without inner support clad steel sheet pile core combined cofferdam:
Design condition: 18m steel sheet pile is squeezed into lakebed, water level is at+20.35m, and cofferdam internal drainage is to lakebed, bankets to+21.00m, and steel sheet pile arranges pull bar.Without the concrete schematic diagram of inner support clad steel sheet pile core combined cofferdam as shown in Figures 3 and 4: upstream face steel sheet pile crest level+22.00m, back side steel sheet pile crest level+21.00m, the thick 0.5m of hair slag, elevation+21.50m bankets in sub-cofferdam.Wherein, steel sheet pile is Larsen IV shaped steel plate pile; Waist rail is [28b channel-section steel; Pull bar is diameter 32(mm) worm steel, arrangement pitches is 1.6m.
Application ANSYS software, steel sheet pile adopts three-dimensional shell unit shell63 modeling, and pull bar adopts spring unit combin14, and soil layer adopts entity solid45 simulation, applies steel sheet pile and soil layer contact conditions.
Soil layer entity size is got along soil depth direction 20m, and width is got 30m, and length direction is got 20 steel sheet pile length along cofferdam trend.Load adopts area load to apply, and applies gradient water pressure on the steel sheet pile of cofferdam.
By above-mentioned result of calculation, can be drawn: steel sheet pile maximum distortion is 80.9mm, steel sheet pile pile body maximum stress value is 46.7Mpa.Result of calculation is to meet Rigidity and strength requirement, and structure is reliable and stable under design condition.
According to on-the-spot long term monitoring data, show, steel sheet pile bulk deformation is in allowed band, and it is on-the-spot in cofferdam, not occur seeping water simultaneously, and this cofferdam structure form is safe and reliable.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (7)
1. without an inner support clad steel sheet pile core combined cofferdam structure, it is characterized in that: comprise upstream face steel sheet pile and back side steel sheet pile, between steel sheet pile, fill cohesive soil and form cofferdam; In upstream face steel sheet-pile cofferdam inner side, lay composite geo-membrane; Between twice steel sheet pile, top adopts pull bar to connect, and steel sheet pile arranged outside has waist rail, and pull bar is with bolts by waist rail; When weir core cohesive soil fill with the same absolute altitude of pull bar after, then fill one deck hair slag, at upstream face steel sheet pile place, sub-cofferdam is set simultaneously.
2. according to claim 1 without inner support clad steel sheet pile core combined cofferdam structure, it is characterized in that: described steel sheet pile is Larsen IV shaped steel plate pile.
3. according to claim 1 without inner support clad steel sheet pile core combined cofferdam structure, it is characterized in that: the material of described pull bar is 32 screw-thread steels.
4. according to claim 1 without inner support clad steel sheet pile core combined cofferdam structure, it is characterized in that: the material of described waist rail is 28b channel-section steel.
5. according to claim 1 without inner support clad steel sheet pile core combined cofferdam structure, it is characterized in that: described bolt is arranged on waist rail outside.
6. the construction method without inner support clad steel sheet pile core combined cofferdam structure described in claim 1～5 any one, comprises following steps: first carry out both sides steel sheet pile and set, steel sheet pile is pressed pile head elevation control building-in depth, and each is arranged snap close between steel sheet pile and connects; The steel sheet pile construction complete upstream face steel sheet pile geomembrane that carries out in both sides hangs, and geomembrane adopts packeted soil to carry out bottom presser feet; Then carry out the construction of both sides steel sheet pile waist rail and pull bar, waist rail is arranged on steel sheet pile outside, and pull bar laterally links along cofferdam trend, and pull bar place steel sheet pile and waist rail need punching, with bolts between pull bar and waist rail; Finally carry out weir core and fill, when weir core cohesive soil fill with the same absolute altitude of pull bar after, then fill one deck hair slag, finally at upstream face steel sheet pile place, sub-cofferdam is set.
7. described in claim 1～5 any one, without inner support clad steel sheet pile core combined cofferdam structure, in river or lake, adopt cut and cover method to build the application in the underground structure of strip.
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| CN201310734833.6A CN103669375A (en) | 2013-12-27 | 2013-12-27 | Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975609A (en) * | 2015-07-14 | 2015-10-14 | 上海市水利工程集团有限公司 | Lock catch type steel tube pile cofferdam and construction method |
| CN105714821A (en) * | 2016-04-14 | 2016-06-29 | 中交第二航务工程局有限公司 | Device for tapping dry construction of anchor rod of waterside face of sheet-pile wharf |
| CN106284296A (en) * | 2016-09-28 | 2017-01-04 | 南京工业大学 | The supporting construction of a kind of double steel sheet pile and construction method thereof |
| CN106759365A (en) * | 2016-12-23 | 2017-05-31 | 中船第九设计研究院工程有限公司 | A kind of counterfort wing wall waterproof curtain construction method of foundation pit enclosure wall |
| CN108570996A (en) * | 2018-05-18 | 2018-09-25 | 中交路桥北方工程有限公司 | It builds a dam under the conditions of shallow water mud cofferdam method |
| CN108612117A (en) * | 2018-06-07 | 2018-10-02 | 深圳市市政设计研究院有限公司 | A kind of seabed water-retaining structure across municipal tunnel greatly and construction method |
| CN109653226A (en) * | 2019-01-02 | 2019-04-19 | 中铁大桥局集团有限公司 | A kind of cofferdam structure based on the double steel sheet pile of core filling type |
| CN109706936A (en) * | 2018-10-12 | 2019-05-03 | 武汉市市政建设集团有限公司 | A kind of bridge pier foundation pit multistage support structure |
| CN110439012A (en) * | 2019-07-22 | 2019-11-12 | 安徽省交通建设股份有限公司 | It paddles the construction method of open-cut foundation ditch combined steel sheet-pile cofferdam |
| CN110499772A (en) * | 2019-08-29 | 2019-11-26 | 中天路桥有限公司 | A kind of rock matter riverbed double-layer plate pile cofferdam construction method |
| CN111576458A (en) * | 2020-06-02 | 2020-08-25 | 浙江交工金筑交通建设有限公司 | Inner support-free steel pipe pile cofferdam structure and construction method thereof |
| CN111733841A (en) * | 2020-06-16 | 2020-10-02 | 中建三局基础设施建设投资有限公司 | Lake bottom karst treatment method for deep-buried shield tunnel |
| CN111851540A (en) * | 2020-07-07 | 2020-10-30 | 广东珠荣工程设计有限公司 | High-rigidity anti-seepage combined cofferdam and construction method thereof |
| CN112227391A (en) * | 2020-10-14 | 2021-01-15 | 安徽省交通建设股份有限公司 | Ecological steel sheet pile island-building cofferdam and construction method |
| CN112281881A (en) * | 2020-11-24 | 2021-01-29 | 中国十七冶集团有限公司 | Water-stopping cofferdam structure and construction method thereof |
| CN115387365A (en) * | 2022-08-08 | 2022-11-25 | 南京市水利建筑工程有限公司 | Low-water-head cofferdam construction method based on soil and stone deficient area |
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| CN104975609A (en) * | 2015-07-14 | 2015-10-14 | 上海市水利工程集团有限公司 | Lock catch type steel tube pile cofferdam and construction method |
| CN105714821A (en) * | 2016-04-14 | 2016-06-29 | 中交第二航务工程局有限公司 | Device for tapping dry construction of anchor rod of waterside face of sheet-pile wharf |
| CN105714821B (en) * | 2016-04-14 | 2017-11-21 | 中交第二航务工程局有限公司 | A kind of device for sheet-pile wharf face anchor pole perforate dry application work near water |
| CN106284296A (en) * | 2016-09-28 | 2017-01-04 | 南京工业大学 | The supporting construction of a kind of double steel sheet pile and construction method thereof |
| CN106759365A (en) * | 2016-12-23 | 2017-05-31 | 中船第九设计研究院工程有限公司 | A kind of counterfort wing wall waterproof curtain construction method of foundation pit enclosure wall |
| CN106759365B (en) * | 2016-12-23 | 2018-11-27 | 中船第九设计研究院工程有限公司 | A kind of counterfort wing wall waterproof curtain construction method of foundation pit enclosure wall |
| CN108570996A (en) * | 2018-05-18 | 2018-09-25 | 中交路桥北方工程有限公司 | It builds a dam under the conditions of shallow water mud cofferdam method |
| CN108612117A (en) * | 2018-06-07 | 2018-10-02 | 深圳市市政设计研究院有限公司 | A kind of seabed water-retaining structure across municipal tunnel greatly and construction method |
| CN109706936A (en) * | 2018-10-12 | 2019-05-03 | 武汉市市政建设集团有限公司 | A kind of bridge pier foundation pit multistage support structure |
| CN109653226A (en) * | 2019-01-02 | 2019-04-19 | 中铁大桥局集团有限公司 | A kind of cofferdam structure based on the double steel sheet pile of core filling type |
| CN110439012A (en) * | 2019-07-22 | 2019-11-12 | 安徽省交通建设股份有限公司 | It paddles the construction method of open-cut foundation ditch combined steel sheet-pile cofferdam |
| CN110439012B (en) * | 2019-07-22 | 2021-02-26 | 安徽省交通建设股份有限公司 | Construction method of wading open-cut foundation pit composite steel sheet pile cofferdam |
| CN110499772A (en) * | 2019-08-29 | 2019-11-26 | 中天路桥有限公司 | A kind of rock matter riverbed double-layer plate pile cofferdam construction method |
| CN111576458A (en) * | 2020-06-02 | 2020-08-25 | 浙江交工金筑交通建设有限公司 | Inner support-free steel pipe pile cofferdam structure and construction method thereof |
| CN111733841A (en) * | 2020-06-16 | 2020-10-02 | 中建三局基础设施建设投资有限公司 | Lake bottom karst treatment method for deep-buried shield tunnel |
| CN111851540A (en) * | 2020-07-07 | 2020-10-30 | 广东珠荣工程设计有限公司 | High-rigidity anti-seepage combined cofferdam and construction method thereof |
| CN112227391A (en) * | 2020-10-14 | 2021-01-15 | 安徽省交通建设股份有限公司 | Ecological steel sheet pile island-building cofferdam and construction method |
| CN112281881A (en) * | 2020-11-24 | 2021-01-29 | 中国十七冶集团有限公司 | Water-stopping cofferdam structure and construction method thereof |
| CN115387365A (en) * | 2022-08-08 | 2022-11-25 | 南京市水利建筑工程有限公司 | Low-water-head cofferdam construction method based on soil and stone deficient area |
| CN115387365B (en) * | 2022-08-08 | 2023-11-28 | 南京市水利建筑工程有限公司 | Low-water-head cofferdam construction method based on soil and stone deficient area |
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Application publication date: 20140326 |