CN101597904B - Waterproof sheet pile cofferdam and construction method thereof - Google Patents

Waterproof sheet pile cofferdam and construction method thereof Download PDF

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Publication number
CN101597904B
CN101597904B CN 200910031734 CN200910031734A CN101597904B CN 101597904 B CN101597904 B CN 101597904B CN 200910031734 CN200910031734 CN 200910031734 CN 200910031734 A CN200910031734 A CN 200910031734A CN 101597904 B CN101597904 B CN 101597904B
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Prior art keywords
steel pipe
steel
pile
cofferdam
steel plate
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Expired - Fee Related
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CN 200910031734
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CN101597904A (en
Inventor
徐文平
王仙美
周晨
沈旭鸿
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Nantong Huagong Machinery Co., Ltd.
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Southeast University
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Priority to CN 200910031734 priority Critical patent/CN101597904B/en
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Abstract

A waterproof sheet pile cofferdam is provided with a plurality of cluster steel pipe piles; two adjacent cluster steel pipe piles are connected by steel plate baffles, each cluster steel pipe pile is formed by welding at least two steel pipes as the long pile of the cofferdam, each steel pipe is provided with a gap running through the steel pipe, limited blocks are arranged between the insertion edges of the steel plate baffles and the gaps, the steel pipes of the cluster steel pipe piles are internally provided with waterproof fillers prepared by the mixture of 40-50% of bentonite, 20-25% of fly ash, 25-35% of red mud.

Description

A kind of water-proof sheet pile cofferdam and job practices thereof
Technical field
The present invention relates to the cofferdam technology of civil engineering, particularly a kind of water-proof sheet pile cofferdam and job practices thereof, can be applicable to the deepwater foundation construction, retaining support structure, levee revetment in the fields such as bridge engineering, port works etc.
Background technology
In bridge foundation, hydraulic structure construction, enter the position of building of bridge pier or building in order to prevent water and soil, need build provisional cofferdam structure, so that at the cofferdam internal drainage, excavation pit is built building.When the depth of water is more shallow, generally adopt earth fill cofferdam; The dark and larger river of flow velocity generally adopts timber sheet piling or steel sheet-pile cofferdam at water, and generally remove after being finished in the cofferdam.
Traditional steel sheet-pile cofferdam is widely used in deep pit digging, the construction of bridge foundation in depth water plinth with characteristics such as its anti-bending strength are good, water proofing property is better, lightweight, easy construction, cost are low.Yet; in Practical Project, steel sheet-pile cofferdam often can leak, the phenomenon that seeps water, and its main cause is not carry out the run-off the straight when squeezing into of correction process or steel sheet pile before old steel sheet pile uses; the fore shaft of adjacent two boards stake causes fore shaft to leak, seep water to inserting imprecision.If there is seepy question in steel sheet pile, on one side need draw water, Yi Bian under the seam of steel sheet pile, slip a large amount of dried fine sand and wood chip, by water pressure fine sand and wood chip is sucked in the seam, and reach the purpose of leak stopping; Be out of shape larger seam, enclosing the postpone of purlin cloth, need to fill out with cotton stopper, construction is got up cumbersome.For the deficiency in traditional cofferdam, engineering field needs that a kind of anti-bending strength is good, water resistance is good, expense is lower, easy construction novel fabricated waterproof cofferdam badly.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of water-proof sheet pile cofferdam and job practices thereof are provided, its technical scheme is: a kind of water-proof sheet pile cofferdam, it is characterized in that being provided with a plurality of boundling steel pipe piles, connected by the steel plate enclosing between the adjacent two boundling steel pipe piles, each boundling steel pipe pile system forms long stake as the cofferdam by at least two steel-pipe weldings, every steel pipe all has a slot that connects steel pipe length, steel plate enclosing the right and left inserts respectively the interior stub as the cofferdam of corresponding slot of a steel pipe in the adjacent two boundling steel pipe piles, be provided with the assembling limited block greater than slit-widths between the insertion limit of steel plate enclosing and the slot, be provided with waterproof filler swell soil in the steel pipe of boundling steel pipe pile.
Said steel plate enclosing can be made into the U-shaped steel plate, with increase hydraulic pressure resistance performance, and is provided with the horizontal flange that turns up that inserts slot;
The structure of said limited block can be to arrange two to be arranged symmetrically in the grooved steel bar that inserts steel plate two planes, and bottom land is connected into one, trough rim and steel pipe inner wall form fit by the water proof rubber pad with bolt and steel plate assembling.
Said boundling steel pipe pile preferably adopts 3 steel pipe weldings to be connected into the Y shape stake, to increase load-carrying properties; In each boundling steel pipe pile, can only in two steel pipes that insert the steel plate enclosing, pour into waterproof filler swell soil.
Assembling and the job practices of the water-proof sheet pile cofferdam of said structure are as follows:
The technological process of construction is: measure setting-out, and---------swell soil compound filler pours into steel pipe, and------assembling lock connection fastener is connected with U-shaped steel plate bolt, and---U-shaped steel sheet pile insertion steel pipe---draws water in---concrete back cover---cofferdam of enclosing the purlin Construction of Supporting hole that begins to rehearse, U-shaped sheet pile two ends Y shape boundling steel pipe pile pile sinking guide pile.
(1) location setting-out
According to the size of water conservancy project structure or bridge pier, determine the planar dimension in waterproof cofferdam.Accurate setting out survey is determined the position of guide pile, and the riverbed is cleared up, and avoids running into obstruction in steel sheet pile inserted to play position;
(2) Y shape boundling steel pipe pile pile sinking
Y shape boundling steel pipe pile is squeezed into water-bed soil layer, answer its verticality of strict guarantee, the pile sinking mode can adopt construction method, vibration construction method, the hydraulic construction method of impacting;
(3) swell soil compound filler pours into steel pipe
The compound of getting swell soil 40%~50%, flyash 20%~25%, red mud 25%~35% is mixed with the waterproof inserts and pours in the steel pipe;
(4) assembling lock connection flute profile steel bar is connected with U-shaped steel plate bolt
Adopt the cold-rolled forming section method that steel plate is curved the U-shaped steel plate, the U-shaped steel plate is offered the bolt single row of holes with the horizontal flange that turns up at the both sides horizontal flange, and bolt single row of holes spacing is generally 20~25cm, so that assembling fastener location; Adopt the U-steel bar as lock connection fastener, grooved steel bar inboard arranges waterproof rubber sheet, and grooved steel bar fastener correspondence is offered the bolt single row of holes of 20~25cm, and former and later two grooved steel bar lock connection fasteners are connected with U-shaped steel plate bolts assemblies;
(5) the U-shaped steel sheet pile inserts steel pipe
Behind the chain fastener of U-shaped steel plate two ends fit on, embedded and the bottom along steel pipe slot pile sinking to steel pipe by steel pipe top;
(6) enclose the purlin Construction of Supporting
In order to increase the structural stability in waterproof cofferdam, increase the ability of opposing water pressure, the multiple tracks waterproof can be set enclose the purlin support, progressively increase while drawing water and enclose the purlin support.Enclose purlin and support the general section steel manufacture that adopts;
(7) concrete back cover
Because the cushion cap bottom surface is unsettled, the first about 30~50cm sheet stone of substrate throwing in the cofferdam, a certain amount of river of backfill sand levelling basal surface 50cm to the cushion cap bottom surface then, then the thick C30 concrete of envelope 50cm is done in substrate; Around the bottom steel sheet pile, with woven bag or geotextiles steel sheet pile and envelope concrete are isolated before the back cover, so that steel pipe pile, steel sheet pile are pulled out smoothly in the future; Absolute altitude can not be higher than design elevation at the bottom of the cushion cap behind the back cover, and back cover concrete end face guarantees substantially smooth; The back cover concrete adopts pumping, is undertaken by general concrete construction; Advanced to another side by one side during back cover, but guarantee continuously, uninterruptedly, not stay seam, disposable finishing.
Advantage of the present invention and beneficial effect: utilize 3 to open the perps steel pipe welding and be connected into Y shape boundling steel pipe pile, its supporting capacity is higher, as the long stake of waterproof cofferdam structure; Utilize water resistance preferably sodium bentonite pour in the steel pipe pile, as the waterproof inserts; Utilize the U-shaped steel plate insertion that price is cheap, soil compaction effect is low to open in the perps steel pipe, as the stub in waterproof cofferdam; Long stake and stub alternative arrangement form the cofferdam, are fit to the bed configuration of more complicated, and arrangement is versatile and flexible, and soil compaction effect is less on the impact of surrounding enviroment in the pile driving process, and long pile length is between 8m~60m, and the length of stub is 70%~90% of long stake.In U-shaped steel plate insertion end bolted assembling locating part is set, has preferably Interlock Function.Water resistance of the present invention is good, easy construction, and each prefabricated member can repeatedly reuse.Can be widely used in the deepwater foundation construction, retaining support structure, levee revetment in the fields such as bridge engineering, port works etc.
Description of drawings
Fig. 1 is that steel pipe pile of the present invention and steel plate enclosing draw bail one implements illustration;
Fig. 2 is the position limiting structure among Fig. 1;
Fig. 3 is general effect figure of the present invention.
The specific embodiment
The invention will be further described below in conjunction with embodiment that accompanying drawing provides.
Referring to Fig. 1,2, open perps (locate according to designing requirement the perps position) steel pipe with 3 and bundle, by welding they are welded into Y shape boundling steel pipe pile 1.Y shape boundling steel pipe pile globality is strong, and anti-bending strength is good, penetrates complicated soil layer ability strong, squeezes into soil depth larger, as the long stake in this waterproof cofferdam; In steel pipe, pour into sodium bentonite compound filled core 2; Adopt the cold-rolled forming section explained hereafter with the U-shaped steel sheet pile 3 of the horizontal flange that turns up, offer the bolt single row of holes on the edge of a wing, both sides.Adopt steel plate to become flute profile steel bar 4 as limiting lock connection fastener with steel pipe segmental arc welding production, its shape matches with the steel pipe inner circle as far as possible, lock connection fastener steel bar is split the bolt single row of holes, adopt connecting bolt 6, two lock connection fastener steel bars are connected the inboard waterproof rubber sheet 5 of pasting of lock connection fastener steel bar with U-shaped steel sheet pile 3 bolts assemblies.Utilize sinking apparatus, will the U-shaped steel sheet pile 3 of lock connection fastener steel bar be installed, insert in the Y shape boundling steel pipe pile 1, as the stub in this waterproof cofferdam; Namely form a sections in this waterproof cofferdam, construction forms whole waterproof cofferdam such as Fig. 3 section by section.
The technological process that the present invention is used for engineering construction is: measure setting-out, and---------swell soil compound filler pours into steel pipe, and------assembling lock connection fastener is connected with U-shaped steel plate bolt, and---U-shaped steel sheet pile insertion steel pipe---draws water in---concrete back cover---cofferdam of enclosing the purlin Construction of Supporting hole that begins to rehearse, U-shaped sheet pile two ends Y shape boundling steel pipe pile pile sinking guide pile.
(1) location setting-out
According to the size of water conservancy project structure or bridge pier, determine the planar dimension in waterproof cofferdam.Accurate setting out survey is determined the position of guide pile, and the riverbed is cleared up, and avoids running into obstruction in steel sheet pile inserted to play position.
(2) Y shape boundling steel pipe pile pile sinking
Y shape boundling steel pipe pile is squeezed into water-bed soil layer, answer its verticality of strict guarantee, the pile sinking mode can adopt construction method, vibration construction method, the hydraulic construction method of impacting.
(3) swell soil compound filler pours into steel pipe
Sodium bentonite has very strong hygroscopicity, can adsorb the water that is equivalent to 8~20 times of own vols and is expanded to 30 times; Can disperse to be soliquid in aqueous medium, and have certain viscosity, thixotropy and lubricity, the admixture of it and silt etc. has plasticity and caking property, and stronger cation exchange capacity (CEC) and adsorption capacity are arranged.For reducing cost and reducing expansion force in the pipe, should adopt the swell soil compound, evidence, the compound water resistance of bentonite content 40%~50%, fly ash content 20%~25%, red mud content 25%~35% is better, can be used as pipe inner waterproofing inserts.
(4) assembling lock connection fastener is connected with U-shaped steel plate bolt
Adopt the cold-rolled forming section method that steel plate is curved the U-shaped steel plate, the U-shaped steel plate is offered the bolt single row of holes with the horizontal flange that turns up at the both sides horizontal flange, and bolt single row of holes spacing is generally 20~25cm, so that assembling fastener location.Adopt special U-steel bar as lock connection fastener, the U-steel strip matches with the steel pipe inner circle as far as possible, grooved steel bar inboard arranges waterproof rubber sheet, grooved steel bar fastener correspondence is offered the bolt single row of holes of 20~25cm, and former and later two grooved steel bar lock connection fasteners are connected with U-shaped steel plate bolts assemblies.
(5) the U-shaped steel sheet pile inserts steel pipe
The advantages such as the U-shaped steel sheet pile has that intensity is high, light-duty, construction is simple, good endurance, soil compaction effect are low, economical with materials can be used as the plate stub in this waterproof cofferdam, main Under Lateral Loading.Fit on chain fastener in U-shaped steel plate two ends forms two circular arcs, better coincide with the steel pipe inner circle, and is easy to assembly, and the lock connection is reliable, and pile sinking is convenient.
(6) enclose the purlin Construction of Supporting
In order to increase the structural stability in waterproof cofferdam, increase the ability of opposing water pressure, the multiple tracks waterproof can be set enclose the purlin support, progressively increase while drawing water and enclose the purlin support.Enclose purlin and support the general section steel manufacture that adopts.
(7) concrete back cover
Because the cushion cap bottom surface is unsettled, the first about 30~50cm sheet stone of substrate throwing in the cofferdam, a certain amount of river of backfill sand levelling basal surface 50cm to the cushion cap bottom surface then, then the thick C30 concrete of envelope 50cm is done in substrate.Around the bottom steel sheet pile, with woven bag or geotextiles steel sheet pile and envelope concrete are isolated before the back cover, so that steel pipe pile, steel sheet pile are pulled out smoothly in the future.Absolute altitude can not be higher than design elevation at the bottom of the cushion cap behind the back cover, and back cover concrete end face guarantees substantially smooth.The back cover concrete adopts pumping, is undertaken by general concrete construction.Advanced to another side by one side during back cover, but guarantee continuously, uninterruptedly, not stay seam, disposable finishing.

Claims (2)

1. water-proof sheet pile cofferdam, be provided with a plurality of boundling steel pipe piles, connected by the steel plate enclosing between the adjacent two boundling steel pipe piles, each boundling steel pipe pile system forms long stake as the cofferdam by at least two steel-pipe weldings, every steel pipe all has a slot that connects steel pipe length, steel plate enclosing the right and left inserts respectively the interior stub as the cofferdam of corresponding slot of a steel pipe in the adjacent two boundling steel pipe piles, be provided with the limited block greater than slit-widths between the insertion limit of steel plate enclosing and the slot, be provided with waterproof filler swell soil in the steel pipe of boundling steel pipe pile; It is characterized in that:
Said steel plate enclosing is made U-shaped steel plate and is provided with the horizontal flange that turns up that inserts slot;
Said boundling steel pipe pile adopts 3 steel pipe weldings to be connected into the Y shape stake, is provided with waterproof filler swell soil in the steel pipe of insertion steel plate enclosing;
The structure of said limited block is to arrange two to be arranged symmetrically in the grooved steel bar that inserts steel plate two planes, and bottom land is connected into one by the water proof rubber pad with bolt and steel plate, trough rim and steel pipe inner wall form fit.
2. the job practices of described water-proof sheet pile cofferdam according to claim 1 is characterized in that the technological process of constructing is: measure setting-out, and---------swell soil compound filler pours into steel pipe, and------assembling lock connection fastener is connected with U-shaped steel plate bolt, and---U-shaped steel sheet pile insertion steel pipe---draws water in---concrete back cover---cofferdam of enclosing the purlin Construction of Supporting hole that begins to rehearse, U-shaped sheet pile two ends Y shape boundling steel pipe pile pile sinking guide pile;
(1) location setting-out
According to the size of water conservancy project structure or bridge pier, determine the planar dimension in waterproof cofferdam, accurate setting out survey is determined the position of guide pile, and the riverbed is cleared up, and avoids running into obstruction in steel sheet pile inserted to play position;
(2) Y shape boundling steel pipe pile pile sinking
Y shape boundling steel pipe pile is squeezed into water-bed soil layer, answer its verticality of strict guarantee, the pile sinking mode adopts construction method, vibration construction method, the hydraulic construction method of impacting;
(3) swell soil compound filler pours into steel pipe
The compound of getting swell soil 40%~50%, flyash 20%~25%, red mud 25%~35% is mixed with the waterproof inserts and pours in the steel pipe;
(4) assembling lock connection flute profile steel bar is connected with U-shaped steel plate bolt
Adopt the cold-rolled forming section method that steel plate is curved the U-shaped steel plate, the U-shaped steel plate is offered the bolt single row of holes with the horizontal flange that turns up at the both sides horizontal flange, and bolt single row of holes spacing is 20~25cm, so that assembling fastener location; Adopt the U-steel bar as lock connection fastener, grooved steel bar inboard arranges waterproof rubber sheet, and grooved steel bar fastener correspondence is offered the bolt single row of holes of 20~25cm, and former and later two grooved steel bar lock connection fasteners are connected with U-shaped steel plate bolts assemblies;
(5) the U-shaped steel sheet pile inserts steel pipe
Behind the chain fastener of U-shaped steel plate two ends fit on, embedded and the bottom along steel pipe slot pile sinking to steel pipe by steel pipe top;
(6) enclose the purlin Construction of Supporting
In order to increase the structural stability in waterproof cofferdam, increase the ability of opposing water pressure, the multiple tracks waterproof is set encloses the purlin support, progressively increase while drawing water and enclose the purlin support, enclose the purlin support and adopt section steel manufacture;
(7) concrete back cover
Because the cushion cap bottom surface is unsettled, first substrate throwing 30~50cm sheet stone in the cofferdam, a certain amount of river of backfill sand levelling basal surface 50cm to the cushion cap bottom surface then, then the thick C30 concrete of envelope 50cm is done in substrate; Around the bottom steel sheet pile, with woven bag or geotextiles steel sheet pile and envelope concrete are isolated before the back cover, so that steel pipe pile, steel sheet pile are pulled out smoothly in the future; Absolute altitude can not be higher than design elevation at the bottom of the cushion cap behind the back cover, and back cover concrete end face guarantees substantially smooth; The back cover concrete adopts pumping, is undertaken by the concrete construction; Advanced to another side by one side during back cover, but guarantee continuously, uninterruptedly, not stay seam, disposable finishing.
CN 200910031734 2009-07-03 2009-07-03 Waterproof sheet pile cofferdam and construction method thereof Expired - Fee Related CN101597904B (en)

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Families Citing this family (8)

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CN101781894B (en) * 2009-12-23 2012-05-09 中铁大桥局集团第一工程有限公司 Steel pipe pile locking notch structure and water-stopping method of steel pipe pile cofferdam
CN102720203A (en) * 2012-06-05 2012-10-10 中交第一航务工程局有限公司 Water stopping structure of man-made island steel cylinder cofferdam
CN102900089B (en) * 2012-10-31 2015-08-26 东南大学 With the combination piling bar cofferdam of hydro-expansive rubber waterproof fore shaft
CN104196042B (en) * 2014-08-15 2015-12-09 中国建筑第六工程局有限公司 A kind of steel sheet pile cofferdam structure construction method
CN106049419B (en) * 2016-04-22 2019-03-08 海盐汇祥新型建材科技有限公司 A kind of combination against seepage sheet pile
CN109372031B (en) * 2018-12-19 2020-12-22 中铁二局集团有限公司 Water-stop material for steel pipe pile cofferdam lock catch
CN109914421A (en) * 2019-03-01 2019-06-21 华北水利水电大学 A kind of side slope reinforcement of foundation pit recyclable mini pile steel pipe and its construction method
CN110565669A (en) * 2019-09-12 2019-12-13 北京崇建工程有限公司 Well pit water-intercepting and soil-retaining construction method

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