CN108330995A - A kind of deep water thick mud layer environment lower steel plate pile cofferdam construction method - Google Patents

A kind of deep water thick mud layer environment lower steel plate pile cofferdam construction method Download PDF

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Publication number
CN108330995A
CN108330995A CN201810062753.3A CN201810062753A CN108330995A CN 108330995 A CN108330995 A CN 108330995A CN 201810062753 A CN201810062753 A CN 201810062753A CN 108330995 A CN108330995 A CN 108330995A
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China
Prior art keywords
cofferdam
steel
pile
piling
support
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CN201810062753.3A
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Inventor
牟行勇
明德江
郭跃
孙兵
汪捍东
何良飞
李东山
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Sichuan Road and Bridge Group Co Ltd
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Sichuan Road and Bridge Group Co Ltd
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Priority to CN201810062753.3A priority Critical patent/CN108330995A/en
Publication of CN108330995A publication Critical patent/CN108330995A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/02Restraining of open water
    • E02D19/04Restraining of open water by coffer-dams, e.g. made of sheet piles

Abstract

The invention discloses a kind of deep water thick mud layer environment lower steel plate pile cofferdam construction methods:First inserting piling four is oriented to steel-pipe piles on the inside of supporting ring beam when construction, first layer inner support is placed on being oriented to steel-pipe pile also serves as steel sheet pile guide housing, length shaped steel plate pile replaces inserting piling and patch is welded on first layer inner support collar tie beam one by one, assists steel-pipe pile and long shaped steel plate pile to improve build-in stability of the cofferdam in mud geology by inner support;After steel sheet-pile cofferdam closure, the surrounding inserting piling steel-pipe pile Auxiliary support again on the outside of cofferdam;Desilting is inhaled to back cover bottom elevation using combined type dredge pump and telescopic arm grab bucket, pours underwater bottom concrete, to overcome the problems, such as that it is low that traditional air compressor machine reacting cycle inhales bricklayer's's skill efficiency under thick mud layer geological conditions;The suspension filling plastic film strip from top to bottom at fore shaft gap on the outside of the steel sheet-pile cofferdam, drawing water in cofferdam generates pressure difference film and is filled at fore shaft gap with flow, to reach water-stagnating effect.

Description

A kind of deep water thick mud layer environment lower steel plate pile cofferdam construction method
Technical field
It is especially that a kind of deep water thick mud layer environment lower steel plate pile cofferdam is applied the present invention relates to a kind of cofferdam construction method Work method.
Background technology
On-water bridge is increasing now, to ensure that navigation safety, bridge foundation of more and more paddling are embedded in riverbed Under face.It for geological condition of the Riverbed based on thick silt layer, is influenced by cofferdam building-in depth, overlength steel sheet pile is applied Work is difficult, is often used steel lifted trunk, fore shaft steel-pipe pile form cofferdam to solve the problems, such as the cofferdam stabilization under this particular surroundings, but steel Hanging box and opening locked steel tube pilecofferdam construction cost height, complex procedures.The present invention provides a kind of thick mud layer deepwater foundation steel herein Sheet-pile cofferdam construction method.It was verified that this kind of construction technology is economic and practical, safe and reliable.
Invention content
Therefore, in order to solve above-mentioned deficiency, the present invention provides a kind of steel sheet pile cofferdam construction method, solves thick silt herein Deepwater foundation construction technical barrier under mud layer geological conditions;First inserting piling four is oriented to steel-pipe piles on the inside of supporting ring beam when construction, First layer inner support is placed on being oriented to steel-pipe pile and also serves as steel sheet pile guide housing, and length shaped steel plate pile replaces inserting piling and one by one patch weldering On first layer inner support collar tie beam, assist steel-pipe pile and long shaped steel plate pile to improve cofferdam in mud geology by inner support Build-in stability;After steel sheet-pile cofferdam closure, the surrounding inserting piling steel-pipe pile Auxiliary support again on the outside of cofferdam;Mud is inhaled using combined type Pump and telescopic arm grab bucket inhale desilting to back cover bottom elevation, underwater bottom concrete are poured, to overcome traditional air compressor machine reacting cycle Inhale bricklayer's's skill low problem of efficiency under thick mud layer geological conditions;It is hanged from top to bottom at fore shaft gap on the outside of the steel sheet-pile cofferdam Filling plastic film strip is hung, the generation pressure difference film that draws water in cofferdam is filled in flow at fore shaft gap, to reach water-stagnating effect.
The invention is realized in this way a kind of deep water thick mud layer environment lower steel plate pile cofferdam construction method is constructed, it is special Sign is, implements as follows:
(One)It is oriented to steel-pipe pile inserting piling:According to cofferdam design size, setting-out goes out to be oriented to the position of steel-pipe pile, is passed through using crawler crane Electric vibrating hammer clamping steel-pipe pile carries out inserting piling;Steel-pipe pile must require to squeeze into basic certain depth according to calculating, to ensure that it is steady Solidity.It is oriented to steel-pipe pile to be arranged on the inside of inner support collar tie beam, is arranged 4 altogether, when inserting piling should ensure that its plan-position, unsuitable deviation It is excessive, repetition measurement is carried out after inserting piling.
(Two)Top layer inner support collar tie beam is installed:According to design altitude, welding first layer inner support is assembled on being oriented to steel-pipe pile Bracket goes out top layer inner support collar tie beam surrounding sideline in the setting-out of bracket top surface, and on-site consolidation welds collar tie beam, the single bar on four side of collar tie beam Part makes in processing space.With guiding steel-pipe pile firm welding after the completion of collar tie beam is assembled, the frame of steel sheet pile inserting piling support is formed.
(Three)Steel sheet pile inserting piling
(1)Guide housing is set before steel sheet pile inserting piling on the outside of top layer collar tie beam, and mobile limiting card is installed, to ensure steel sheet pile inserting piling Accurate positioning.For reduce frictional resistance with reinforce sealing, in inserting piling at fore shaft coating butter.Length shaped steel plate pile is alternately inserted It beats, uses long shaped steel plate pile close to collar tie beam side, patch is welded on collar tie beam inserting piling afterwards in place.
(2)During inserting piling, reinforce measuring, finds to tilt, adjust in time.One can be inserted when beginning makes a call to one, it will be each Piece steel sheet pile gets to design position, finally remains a part, first to insert and beat afterwards, if closing up wrong, with jack or tackle pulley to drawing, makes Close up.After closing up, then by root get to projected depth.
(3)After steel sheet pile closure, 8 ultralong steel tube stake Auxiliary supports of surrounding inserting piling, steel pipe pile bottom insertion are steady on the outside Gu base.
(Four)It inhales mud and pours back cover
(1)Since cofferdam is in deep water thick mud layer, is grabbed bucket with telescopic arm using combined type dredge pump and combine progress substrate clear Silt is handled.After the completion of inhaling mud, diver is sent to carry out water jetting at high pressure cleaning to steel sheet pile and casing wall.If being stream modeling after substrate cleaning Property soft layer, cope with the back-up sand of substrate superabsorbent or packing sedimentation by throwing stones, carry out bottom concrete after processing again and pour.
(2)Bottom concrete is poured using underwater vertical tremie method, and from cofferdam both sides to centre, upstream gradually downstream pushes away Into.Elevation of top surface is constantly measured when filling concrete, and benefit side of uniformly kicking off is should be noted that when apart from design altitude 50cm, it is final to push up It reserves 20cm and is used as leveling layer and gutter construction in face.During pouring underwater bottom concrete, inside and outside head difference to be made to protect It holds within the scope of certain, keeps certain pressure, so that the concrete of non-final set is not deformed because pressure is big, to shadow Ring the quality and back cover water-stagnating effect of bottom concrete.
(Five)Fore shaft leak stopping sealing:Bottom concrete carries out patching during conserving to cofferdam.Send diver in cofferdam Fore shaft gap hangs filling plastic film strip from top to bottom on the outside of steel sheet pile, and plastic film strip lower end is fixed using reinforcing bar, cofferdam Reach sealing purpose since external and internal pressure difference plastic film enters fore shaft gap with flow after drawing water.
(Six)The remaining support of installation of drawing water:Bottom concrete starts to draw water after reaching design strength.It draws water to every layer of inner support The positions 1m below collar tie beam absolute altitude stop pumping, and welding collar tie beam supports bracket, installs this layer of collar tie beam and internal overarm support.It should ensure that when installation Collar tie beam is fitted closely with steel sheet pile, and there are steel plate welding filling support pad is used at gap.Reinforce in pump process to cofferdam entirety The monitoring of deformation, collar tie beam and support are drawn water after installing to back cover top surface.
(Seven)Foundation construction and cofferdam demolition:Dredging is carried out to back cover top surface after drawing water, pile crown is cut, pours levelling Layer concrete, construction bearing platform and pier shaft remove cofferdam after infrastructure water level elevation more than expected.Dismounting sequence by lower and On:With the progress of construction, into cofferdam, the inner support position extremely to be removed of recharge water, removes this layer of inner support.Continue later Recharge water removes inner support successively.After removing last layer of inner support, so that inside and outside hydraulic balance, sheet pile extruding force is disappeared, use liquid Pressing tongs cooperation vibration hammer first shakes a few minutes, is repeated several times and pulls up inserting piling and pull out steel sheet pile.
The invention has the advantages that:Setting is oriented to steel-pipe pile supporting ring beam and also serves as guide housing, positions inserting piling steel sheet pile, can Turnover steel pile casting is cut off in advance to use;Replace inserting piling using length shaped steel plate pile, the setting auxiliary steel-pipe pile support on the outside of cofferdam, Cofferdam overall stability can be improved, reduce steel sheet pile dosage;Fore shaft clogs plastic film on the outside of steel sheet pile, utilizes pressure difference of drawing water Bring film into fore shaft gap sealing, method is simple to operation;Suction mud is carried out using telescopic arm grab bucket, combined type dredge pump, compared with Tradition is efficient using air compressor reacting cycle suction mud.
Combining undertaken the construction of Jiangxi Province all nine(Duchang is to Jiujiang)Two bridge C7 of high speed project Poyang Lake marks secondary orifices deep water base Plinth is constructed, and according to the hydrology address situation of poyang lake water, by analysing and comparing, final determine assists collar tie beam using supporting steel pipe Installation, the grab bucket of length steel sheet pile alternate combinations inserting piling, film negative pressure sealing, telescopic arm inhale the measures such as mud with combined type dredge pump, The construction environment for overcoming deep water thick mud layer solves thick mud layer deepwater foundation construction technical barrier.It was verified that this kind Construction technology is economic and practical, safe and reliable.
Description of the drawings
Fig. 1 steel sheet pile cofferdam construction flows;
The cofferdam Fig. 2 floor plan;
Fig. 3 top layer collar tie beam assembly floor map;
Fig. 4 guide housings and limiting card schematic diagram;
The cofferdam Fig. 5 film sealing schematic diagram.
Specific implementation mode
Below in conjunction with attached drawing 1- Fig. 5, the present invention is described in detail, technical solution in the embodiment of the present invention into Row clearly and completely describes, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole realities Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work Every other embodiment, shall fall within the protection scope of the present invention.
The present invention provides a kind of deep water thick mud layer environment lower steel plate pile cofferdam construction method herein by improving, and solves Thick mud layer deepwater foundation construction technical barrier;It was verified that this kind of construction technology is economic and practical, safe and reliable.
Method characteristic is as follows:
(1)Duration is adaptable.It is identical as conventional steel sheet pile cofferdam construction, it is only necessary to live spreading part steel sheet pile;It can be according to work Phase requires, and steel sheet pile is adjusted flexibly into number to meet the requirements, need not process cofferdam material in advance.
(2)Remarkable in economical benefits.Steel sheet pile can be rented outside, need not disposably put into a large amount of raw material and be made for cofferdam, Single cofferdam steel using amount is few, repeatable to be used in turn, and it is low that peace tears expense open.
(3)Structural stability is good.Using the installation of supporting steel pipe auxiliary collar tie beam, the shape of length steel sheet pile alternate combinations inserting piling Formula effectively overcomes the build-in stability in cofferdam under thick silt layer geological conditions.
(4)Construction convenient and efficient.Cofferdam peace is torn open to be assisted without large lifting equipment, using film negative pressure sealing, telescopic arm Grab bucket inhales bricklayer's's skill with combined type dredge pump, and sealing is simple, and it is efficient to inhale mud.
Technological principle:This cofferdam structure is made of Larsen steel sheet pile, inner support system.When construction first on the inside of supporting ring beam Four guiding steel-pipe piles of inserting piling, placement first layer inner support also serves as steel sheet pile guide housing, length shape steel plate on being oriented to steel-pipe pile Stake replaces inserting piling and patch is welded on first layer inner support collar tie beam one by one, assists steel-pipe pile and long shaped steel plate pile to carry by inner support Build-in stability of the high cofferdam in mud geology;After steel sheet-pile cofferdam closure, grabbed bucket using combined type dredge pump and telescopic arm Desilting is inhaled to back cover bottom elevation, pours underwater bottom concrete, is become silted up in thickness with overcoming traditional air compressor machine reacting cycle to inhale bricklayer's's skill The low problem of efficiency under mud layer geological conditions;The suspension filling plastic film from top to bottom at fore shaft gap on the outside of the steel sheet-pile cofferdam Item, drawing water in cofferdam generates pressure difference film and is filled at fore shaft gap with flow, to reach water-stagnating effect.
Construction technology process and key points for operation:Construction technology process is as shown in Figure 1;
(One)It is oriented to steel-pipe pile inserting piling:According to cofferdam design size, setting-out goes out to be oriented to the position of steel-pipe pile, is passed through using crawler crane Electric vibrating hammer clamping steel-pipe pile carries out inserting piling;Steel-pipe pile must require to squeeze into basic certain depth according to calculating, to ensure that it is steady Solidity.It is oriented to steel-pipe pile to be arranged on the inside of inner support collar tie beam, 4 is arranged altogether, as shown in Fig. 2, should ensure that its plane position when inserting piling It sets, unsuitable deviation is excessive, and repetition measurement is carried out after inserting piling.
(Two)Top layer inner support collar tie beam is installed:According to design altitude, welding first layer inner support is assembled on being oriented to steel-pipe pile Bracket, as shown in figure 3, going out top layer inner support collar tie beam surrounding sideline in the setting-out of bracket top surface, on-site consolidation welds collar tie beam, collar tie beam four The single rod piece on side makes in processing space.With guiding steel-pipe pile firm welding after the completion of collar tie beam is assembled, steel sheet pile inserting piling branch is formed The frame of support.
(Three)Steel sheet pile inserting piling
(1)Guide housing is set before steel sheet pile inserting piling on the outside of top layer collar tie beam, and mobile limiting card is installed, as shown in figure 4, to ensure Steel sheet pile inserting piling accurate positioning.For reduce frictional resistance with reinforce sealing, in inserting piling at fore shaft coating butter.Length shaped steel Sheet pile replaces inserting piling, uses long shaped steel plate pile close to collar tie beam side, patch is welded on collar tie beam inserting piling afterwards in place.
(2)During inserting piling, reinforce measuring, finds to tilt, adjust in time.One can be inserted when beginning makes a call to one, it will be each Piece steel sheet pile gets to design position, finally remains a part, first to insert and beat afterwards, if closing up wrong, with jack or tackle pulley to drawing, makes Close up.After closing up, then by root get to projected depth.
(3)After steel sheet pile closure, 8 ultralong steel tube stake Auxiliary supports of surrounding inserting piling, steel pipe pile bottom insertion are steady on the outside Gu base, as shown in Figure 2.
(Four)It inhales mud and pours back cover
(1)Since cofferdam is in deep water thick mud layer, is grabbed bucket with telescopic arm using combined type dredge pump and combine progress substrate clear Silt is handled.After the completion of inhaling mud, diver is sent to carry out water jetting at high pressure cleaning to steel sheet pile and casing wall.If being stream modeling after substrate cleaning Property soft layer, cope with the back-up sand of substrate superabsorbent or packing sedimentation by throwing stones, carry out bottom concrete after processing again and pour.
(2)Bottom concrete is poured using underwater vertical tremie method, and from cofferdam both sides to centre, upstream gradually downstream pushes away Into.Elevation of top surface is constantly measured when filling concrete, and benefit side of uniformly kicking off is should be noted that when apart from design altitude 50cm, it is final to push up It reserves 20cm and is used as leveling layer and gutter construction in face.During pouring underwater bottom concrete, inside and outside head difference to be made to protect It holds within the scope of certain, keeps certain pressure, so that the concrete of non-final set is not deformed because pressure is big, to shadow Ring the quality and back cover water-stagnating effect of bottom concrete.
(Five)Fore shaft leak stopping sealing:Bottom concrete carries out patching during conserving to cofferdam.Send diver in cofferdam Fore shaft gap hangs filling plastic film strip from top to bottom on the outside of steel sheet pile, as shown in figure 5, plastic film strip lower end uses reinforcing bar Fixed, cofferdam since external and internal pressure difference plastic film enters fore shaft gap with flow reaches sealing purpose after drawing water.
(Six)The remaining support of installation of drawing water:Bottom concrete starts to draw water after reaching design strength.It draws water to every layer of inner support The positions 1m below collar tie beam absolute altitude stop pumping, and welding collar tie beam supports bracket, installs this layer of collar tie beam and internal overarm support.It should ensure that when installation Collar tie beam is fitted closely with steel sheet pile, and there are steel plate welding filling support pad is used at gap.Reinforce in pump process to cofferdam entirety The monitoring of deformation, collar tie beam and support are drawn water after installing to back cover top surface.
(Seven)Foundation construction and cofferdam demolition:Dredging is carried out to back cover top surface after drawing water, pile crown is cut, pours levelling Layer concrete, construction bearing platform and pier shaft remove cofferdam after infrastructure water level elevation more than expected.Dismounting sequence by lower and On:With the progress of construction, into cofferdam, the inner support position extremely to be removed of recharge water, removes this layer of inner support.Continue later Recharge water removes inner support successively.After removing last layer of inner support, so that inside and outside hydraulic balance, sheet pile extruding force is disappeared, use liquid Pressing tongs cooperation vibration hammer first shakes a few minutes, is repeated several times and pulls up inserting piling and pull out steel sheet pile.
Performance analysis is presented as:
(1)Economic benefit
By taking two bridge C7 of Poyang Lake marks 38 secondary orifices deepwater foundation constructions as an example, opening locked steel tube pilecofferdam is used to construct in the original plan, after It is optimized to use this method, 16 sets of steel sheet-pile cofferdams, 4 months construction periods, more former opening locked steel tube pilecofferdam scheme warp are put into altogether Help Efficiency Comparison:Using the single cofferdam weight 143t of steel sheet-pile cofferdam, 16 sets of steel sheet pile 2288t, freight charges and lease expenses are leased altogether 425.6 ten thousand yuan;Steel sheet pile cofferdam construction takes 340 yuan/t, 38 184.8 ten thousand yuan of cofferdam construction expenses;Steel sheet pile cofferdam construction is total Lease 55t crawler cranes 8, lease in 4 months and into 150.4 ten thousand yuan of fee for showing up.If using the opening locked steel tube pilecofferdam of identical tricks, Single cofferdam weighs about 200t, and 16 sets of processing needs steel 3200t altogether, and based on this project amortization 30%, processing and manufacturing expense needs 6,560,000 Member;800 yuan/t of opening locked steel tube pilecofferdam operating expenses, 38 6,080,000 yuan of cofferdam construction expenses;Opening locked steel tube pilecofferdam must be rented The construction of 8 85t crawler cranes, lease in 4 months and into 220.8 ten thousand yuan of fee for showing up.
This example occurs expense using steel sheet-pile cofferdam and adds up to 760.8 ten thousand yuan, and opening locked steel tube pilecofferdam adds up to expense 1484.8 Wan Yuan generates 7,240,000 yuan of economic benefit.
(2)Social benefit:
The method is used in two bridge C7 mark secondary orifices underwater foundation constructions of Poyang Lake, 38 depths have been successfully completed 4 months dry seasons Water foundation construction, completing as scheduled for bridge, it is critical to have served, and produces preferable social benefit, worth similar engineering is borrowed Mirror is promoted.
(3)Technical benefits
The example method uses steel sheet-pile cofferdam, assists collar tie beam installation, length steel sheet pile alternate combinations to insert by the way that supporting steel pipe is arranged Beat, the grab bucket of film negative pressure sealing, telescopic arm inhales the techniques such as mud with combined type dredge pump, overcome the construction ring of deep water thick mud layer Border proposes new thinking so that steel sheet-pile cofferdam adaptability is more extensive for the type deepwater foundation construction.
Application example:In December, 2016, in Jiangxi Province, two bridge C7 of nine high speed Poyang Lakes marked secondary orifices to during in April, 2017 This method is applied successfully in underwater foundation construction.
(1)Project profile:Two bridge C7 mark secondary orifices underwater foundation totally 38 of Poyang Lake, cushion cap planar dimension is 8m × 8m, if It counts water level and reaches 10.5m with back cover concrete bottom surface head difference maximum, pier position geological condition complex geologic conditions are from top to bottom deep mud Layer, fine sand(Coarse sand)Layer, gravel layer, shale layer, the most thick 13.7m of mud.
(2)Condition of construction and evaluation of result:By scheme optimization, replace inserting piling using two kinds of length steel sheet piles of 18m and 24m Form cofferdam, inhale the techniques such as mud with combined type dredge pump using film negative pressure sealing, telescopic arm grab bucket, 4 months dry seasons at Work(completes 38 deep water foundation cofferdam, effectively overcomes the unfavorable conditions of deep water thick mud layer, economic benefit and social benefit Significantly, cost-effective 7,240,000 yuan of more former opening locked steel tube pilecofferdam scheme build up for bridge and provide a favorable guarantee as scheduled.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest range caused.

Claims (1)

1. a kind of deep water thick mud layer environment lower steel plate pile cofferdam construction method, it is characterised in that:Implement in accordance with the following steps;
(One)It is oriented to steel-pipe pile inserting piling:According to cofferdam design size, setting-out goes out to be oriented to the position of steel-pipe pile, is passed through using crawler crane Electric vibrating hammer clamping steel-pipe pile carries out inserting piling;Steel-pipe pile must require to squeeze into basic certain depth according to calculating, to ensure that it is steady Solidity;It is oriented to steel-pipe pile to be arranged on the inside of inner support collar tie beam, is arranged 4 altogether, when inserting piling should ensure that its plan-position, unsuitable deviation It is excessive, repetition measurement is carried out after inserting piling;
(Two)Top layer inner support collar tie beam is installed:First layer inner support assembly ox is welded on being oriented to steel-pipe pile according to design altitude Leg goes out top layer inner support collar tie beam surrounding sideline in the setting-out of bracket top surface, and on-site consolidation welds collar tie beam, the single rod piece on four side of collar tie beam It is made in processing space;With guiding steel-pipe pile firm welding after the completion of collar tie beam is assembled, the frame of steel sheet pile inserting piling support is formed;
(Three)Steel sheet pile inserting piling:
(1)Guide housing is set before steel sheet pile inserting piling on the outside of top layer collar tie beam, and mobile limiting card is installed, to ensure steel sheet pile inserting piling Accurate positioning;For reduce frictional resistance with reinforce sealing, in inserting piling at fore shaft coating butter;Length shaped steel plate pile is alternately inserted It beats, uses long shaped steel plate pile close to collar tie beam side, patch is welded on collar tie beam inserting piling afterwards in place;
(2)During inserting piling, reinforce measuring, finds to tilt, adjust in time;One can be inserted when beginning makes a call to one, it will be per a piece of steel Sheet pile gets to design position, finally remains a part, first to insert and beat afterwards, if closing up wrong, with jack or tackle pulley to drawing, is allowed to close Hold together;After closing up, then by root get to projected depth;
(3)After steel sheet pile closure, 8 ultralong steel tube stake Auxiliary supports of surrounding inserting piling, steel pipe pile bottom insertion on the outside consolidates base Layer;
(Four)It inhales mud and pours back cover:
(1)Since cofferdam is in deep water thick mud layer, is grabbed bucket with telescopic arm using combined type dredge pump and combine progress substrate clear Silt is handled;After the completion of inhaling mud, diver is sent to carry out water jetting at high pressure cleaning to steel sheet pile and casing wall;
If being stream plasticity soft layer after substrate cleaning, the back-up sand of substrate superabsorbent or packing sedimentation by throwing stones are coped with, carries out back cover after processing again Concreting;
(2)Bottom concrete is poured using underwater vertical tremie method, and from cofferdam both sides to centre, upstream gradually downstream promotes; Elevation of top surface is constantly measured when filling concrete, and benefit side of uniformly kicking off, final top surface are should be noted that when apart from design altitude 50cm Reserved 20cm is used as leveling layer and gutter construction;During pouring underwater bottom concrete, inside and outside head difference to be made to keep Within the scope of certain, certain pressure is kept, so that the concrete of non-final set is not deformed because pressure is big, to influence The quality and back cover water-stagnating effect of bottom concrete;
(Five)Fore shaft leak stopping sealing:Bottom concrete carries out patching during conserving to cofferdam;Send diver in cofferdam steel plate Stake outside fore shaft gap hangs filling plastic film strip from top to bottom, and plastic film strip lower end is fixed using reinforcing bar, and cofferdam is drawn water Reach sealing purpose since external and internal pressure difference plastic film enters fore shaft gap with flow afterwards;
(Six)The remaining support of installation of drawing water:Bottom concrete starts to draw water after reaching design strength;
Draw water to the positions 1m below every layer of inner support collar tie beam absolute altitude and stop pumping, welding collar tie beam support bracket, install this layer of collar tie beam and Internal overarm support;It should ensure that collar tie beam is fitted closely with steel sheet pile when installation, there are steel plate welding filling support pad is used at gap;It drew water Reinforce the monitoring to cofferdam overall deformation situation in journey, collar tie beam and support are drawn water after installing to back cover top surface;
(Seven)Foundation construction and cofferdam demolition:Dredging is carried out to back cover top surface after drawing water, cuts pile crown, it is mixed to pour screed-coat Solidifying soil, construction bearing platform and pier shaft remove cofferdam after infrastructure water level elevation more than expected;Dismounting sequence is from bottom to top:With The progress of construction, the inner support position extremely to be removed of recharge water, removes this layer of inner support into cofferdam;Continue recharge later Water removes inner support successively;
After removing last layer of inner support, inside and outside hydraulic balance, sheet pile extruding force is made to disappear, is first shaken with hydraulic tongs cooperation vibration hammer Dynamic a few minutes are repeated several times and pull up inserting piling and pull out steel sheet pile.
CN201810062753.3A 2018-01-23 2018-01-23 A kind of deep water thick mud layer environment lower steel plate pile cofferdam construction method Pending CN108330995A (en)

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CN111139849A (en) * 2020-01-03 2020-05-12 浙江大学城市学院 Construction method of deep-buried underwater bearing platform steel sheet pile cofferdam
CN112609721A (en) * 2020-12-07 2021-04-06 中国化学工程第六建设有限公司 Drainage method for steel sheet pile combined large-scale sewage pump
CN113073667A (en) * 2021-04-06 2021-07-06 北京华昊水利水电工程有限责任公司 Assembled cofferdam structure and construction method

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Application publication date: 20180727