CN103835301B - Marine by head difference fast dismantling except fore shaft steel cofferdam construction method - Google Patents

Marine by head difference fast dismantling except fore shaft steel cofferdam construction method Download PDF

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Publication number
CN103835301B
CN103835301B CN201410084760.5A CN201410084760A CN103835301B CN 103835301 B CN103835301 B CN 103835301B CN 201410084760 A CN201410084760 A CN 201410084760A CN 103835301 B CN103835301 B CN 103835301B
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China
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cofferdam
outside
concrete
water level
head difference
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CN201410084760.5A
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CN103835301A (en
Inventor
陈山亭
张海燕
肖世波
孙国光
黄斌
田大千
田东
叶绍佃
王德文
方智恩
路云强
王胜文
胡腾飞
彭颇
何建伟
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China Railway Major Bridge Engineering Group Co Ltd MBEC
5th Engineering Co Ltd of MBEC
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China Railway Major Bridge Engineering Group Co Ltd MBEC
5th Engineering Co Ltd of MBEC
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Abstract

The invention discloses a kind of marine by the construction method of head difference fast dismantling except fore shaft steel cofferdam, it is the ingenious fluctuation by natural resource seawater tide natural phenomena, destroy adhesion stress between cofferdam and bottom concrete by changing head difference produces inside and outside cofferdam pressure differential, make cofferdam and bottom concrete emaciated face from.Then utilize and hang ship entirety and extract handling and carry out next one construction to next pier position.Therefore, tool of the present invention has the following advantages: 1, working procedure is simple, easy to operate; 2, without the need to arranging large-scale pushing tow or underwater installation, cost drops into little; 3, efficient, quick, safety; 4, ingenious at natural resource, energy-conserving and environment-protective.

Description

Marine by head difference fast dismantling except fore shaft steel cofferdam construction method
Technical field
The present invention relates to Bridge Construction method, especially relate to a kind of marine by the construction method of head difference fast dismantling except fore shaft steel cofferdam.
Background technology
In recent years, bridge spanning the sea development in coastal cities is swift and violent, and water Bridge is built underwater foundation construction and all will assist by temporory structure, and temporory structure falls with frequent or after foundation construction completes, dismounting temporory structure recovery original appearance again.How under the marine environment of complexity safety successfully complete underwater foundation construction and can fast, complete to energy-saving and environmental protection the dismounting of temporory structure and use of falling, become the heavy difficult point of bridge construction.
Cofferdam is as a kind of temporory structure of bridge foundation construction, and especially foundation in water construction all will use, and cofferdam demolition falls with frequent, and it is removed use method and determines according to cofferdam type selecting and geological condition.Under normal circumstances, fore shaft steel cofferdam adopts the auxiliary loop wheel machine of large-scale vibrating hammer, and the adhesion stress destroyed between cofferdam and bottom concrete by power of extricating oneself from a predicament and brace oneself up to action carries out monolithic dismounting.There is following shortcoming in this method for dismounting: 1, monolithic is removed, and the time of removing is long; 2, monolithic is again assembled again after removing, and falls long with the cycle; 3, will drop into large-scale vibrating hammer just can remove, cost is high; 4, not only noise is large for vibrating hammer, and there is oil leakage phenomenon when equipment is abnormal, pollutes the environment.Therefore, the aspect factor such as comprehensive high-efficiency, safety, economy, environmental protection, adopting vibrating hammer monolithic to tear open and pulling out is not optimal selection scheme.
Summary of the invention
The object of the present invention is to provide a kind of marinely ingeniously reaching efficient, quick, energy-conservation by head difference, the construction method of safety, environment-friendly demounting fore shaft steel cofferdam.
The object of the present invention is achieved like this:
Marine by the construction method of head difference fast dismantling except fore shaft steel cofferdam, feature is:
A, understanding fore shaft steel cofferdam feature and fluctuation tide tidal range, calculate the pressure differential (inside cofferdam outside hydrostatic pressure and cofferdam outside hydrostatic pressure, cofferdam lateral earth pressure and the difference of adhesion stress between cofferdam inwall and bottom concrete) produced when head difference reaches how many inside and outside above cofferdam, bottom concrete bottom surface, cofferdam, this pressure differential can make cofferdam distending (i.e. cofferdam and bottom concrete emaciated face from); Cofferdam distending requirement can be met under judging the tidal range of spontaneous fluctuation tide;
B, first open cofferdam intercommunicating pore, allow seawater outside cofferdam naturally flow in cofferdam, to make outside cofferdam inside water level elevation and cofferdam water level elevation with high, then the cofferdam intercommunicating pore in shutoff when highest water level, cofferdam maritime interior waters can not be outflowed, tidal height when inner side water level elevation reaches highest water level;
C, etc. to lowest water level time, inside cofferdam, water level elevation exceeds a tidal range than water level elevation outside cofferdam; If the external and internal pressure difference that now inside and outside cofferdam, head difference produces can make cofferdam and bottom concrete emaciated face from, can pull out by direct quick integral easily; Otherwise, then under the state of spontaneous fluctuation tide, head difference inside and outside cofferdam need be increased by human assistance and produce larger pressure official post cofferdam and bottom concrete emaciated face from the object reaching quick integral and pull out cofferdam;
D, cofferdam and bottom concrete emaciated face, from rear, hung ship installation cofferdam in place entirety and are pulled out suspender, and verticality direction when then transferring along cofferdam entirety rises pulls out, and after extracting, entirety is had bad luck and carried out next one construction to next pier position again.
The present invention is the feature according to there is construction gap between the fore shaft of cofferdam, the ingenious poor adhesion stress destroyed between cofferdam inwall and bottom concrete of external and internal pressure produced by head difference inside and outside cofferdam by natural resource, make it only can extract by easy to do quick integral under the operating mode of cofferdam deadweight, then entirety is had bad luck and is constructed to next pier position.Therefore, tool of the present invention has the following advantages: 1, working procedure is simple, easy to operate; 2, without the need to arranging large-scale pushing tow or underwater installation, cost drops into little; 3, efficient, quick, safety; 4, ingenious at natural resource, energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is construction elevational schematic view of the present invention;
Fig. 2 is calculating schematic diagram of the present invention.
Mark in accompanying drawing:
A is that cofferdam top mark is high; B is water level elevation inside cofferdam; C is water level elevation outside cofferdam; D is bottom concrete end face absolute altitude; E is mud absolute altitude outside cofferdam; F is bottom concrete bottom surface absolute altitude; G is absolute altitude at the bottom of cofferdam.
1 is intercommunicating pore; 2 is hydrostatic pressure outside cofferdam; 3 is lateral earth pressure outside cofferdam; 4 is adhesion stress between cofferdam inwall and bottom concrete; 5 is hydrostatic pressure inside cofferdam.
Detailed description of the invention
Contrast accompanying drawing below in conjunction with embodiment the present invention is described in further detail.
Marine by the construction method of head difference fast dismantling except fore shaft steel cofferdam, concrete steps are as follows:
The non-navigable bridge substructure basis of A, port Zhuhai and Macao bridge adopts the temporory structure auxiliary construction without inner support double-walled fore shaft steel cofferdam.This cofferdam forms by 8 pieces, volume large (being of a size of 17.6m × 13.4m × 23.2m), Heavy Weight (gross weight is about 840t), and not easily monolithic is extricated oneself from a predicament and brace oneself up to action; And Zhuhai and Macao bridge non-navigation bridge in port is located in port, nine divisions of China in remote antiquity, average about the 1.5m of tidal range statistics higher low water tidal range over the years, extreme tide range 2.0m.Cofferdam inwall can be met and bottom concrete departs from during by calculating inside and outside head difference and reaching 6.4m, therefore natural tidal range can not meet the demands, and it produces larger external and internal pressure difference cofferdam and bottom concrete just can be made to depart to need human assistance to add water in cofferdam to increase inside and outside cofferdam head official post;
B, open cofferdam intercommunicating pore 1, allow seawater outside cofferdam naturally flow in cofferdam, make outside cofferdam that inside water level elevation c and cofferdam, water level elevation b is with high, then the shutoff cofferdam intercommunicating pore 1 when highest water level, makes cofferdam maritime interior waters not outflow;
C, arrange that the water pump of 10 7.5KW adds water in cofferdam simultaneously, water level elevation b inside cofferdam is made to reach+5.9m, again according to cofferdam fore shaft water leakage situation, continue to add water and make water level elevation b inside cofferdam be not less than+5.9m always, when waiting water level elevation c to-0.5m to neap cofferdam again, now inside and outside cofferdam, head difference reaches 6.4m, inside cofferdam, water level elevation b declines suddenly, show that cofferdam external and internal pressure difference that head difference now produces (inside above cofferdam, bottom concrete bottom surface, hydrostatic pressure 5 to be greater than outside cofferdam outside hydrostatic pressure 2 and cofferdam lateral earth pressure 3 and adhesion stress 4 three sum between cofferdam inwall and bottom concrete) can make cofferdam and bottom concrete depart from, thus destroy adhesion stress 4 between cofferdam inwall and bottom concrete, seawater in cofferdam is flowed out between cofferdam inwall and bottom concrete,
D, cofferdam inwall and bottom concrete emaciated face are from rear, the floating crane positioning of 1200t (cofferdam conduct oneself with dignity about 840t), install cofferdam entirety and extract suspender, verticality direction entirety when then transferring along cofferdam rises pulls out, and after extracting, entirety is had bad luck and carried out next one construction to next pier position again.

Claims (1)

1. marine by the construction method of head difference fast dismantling except fore shaft steel cofferdam, it is characterized in that:
A, understand fore shaft steel cofferdam feature and fluctuation tide tidal range, to calculate inside the cofferdam that produces when head difference reaches how many inside and outside above cofferdam, bottom concrete bottom surface, cofferdam outside hydrostatic pressure and cofferdam outside hydrostatic pressure, cofferdam lateral earth pressure and between cofferdam inwall and bottom concrete the difference of adhesion stress can make cofferdam and bottom concrete emaciated face from; Cofferdam distending requirement can be met under judging the tidal range of spontaneous fluctuation tide;
B, first open cofferdam intercommunicating pore, allow seawater outside cofferdam naturally flow in cofferdam, to make outside cofferdam inside water level elevation and cofferdam water level elevation with high, then the cofferdam intercommunicating pore in shutoff when highest water level, cofferdam maritime interior waters can not be outflowed, tidal height when inner side water level elevation reaches highest water level;
C, etc. to lowest water level time, inside cofferdam, water level elevation exceeds a tidal range than water level elevation outside cofferdam; If hydrostatic pressure outside hydrostatic pressure and cofferdam inside the cofferdam that now inside and outside cofferdam, head difference produces, the outer lateral earth pressure in cofferdam and between cofferdam inwall and bottom concrete the difference of adhesion stress can make cofferdam and bottom concrete emaciated face from, get final product easy to do direct quick integral and pull out; Otherwise, then under the state of spontaneous fluctuation tide, head difference inside and outside cofferdam need be increased by human assistance and produce larger pressure official post cofferdam and bottom concrete emaciated face from the object reaching quick integral and pull out cofferdam;
D, cofferdam and bottom concrete emaciated face, from rear, hung ship installation cofferdam in place entirety and are pulled out suspender, and verticality direction when then transferring along cofferdam entirety rises pulls out, and after extracting, entirety is had bad luck and carried out next one construction to next pier position again.
CN201410084760.5A 2014-03-10 2014-03-10 Marine by head difference fast dismantling except fore shaft steel cofferdam construction method Active CN103835301B (en)

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CN103835301B true CN103835301B (en) 2015-08-19

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Publication number Priority date Publication date Assignee Title
CN108442394A (en) * 2018-03-19 2018-08-24 中建三局基础设施建设投资有限公司 A kind of novel double-wall steel boxed cofferdam and construction method

Citations (6)

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JP2006249685A (en) * 2005-03-08 2006-09-21 Jfe Engineering Kk Cofferdam construction method for underwater structure, and structure for cofferdam
CN101225663A (en) * 2008-01-31 2008-07-23 山东省路桥集团有限公司 Steel boxed cofferdam and recovery method thereof
CN101775809A (en) * 2010-01-15 2010-07-14 中铁大桥局集团第五工程有限公司 Construction method of marine self-floating type steel soleplate single-wall suspension box cofferdam and single-wall suspension box cofferdam
CN102852094A (en) * 2012-08-31 2013-01-02 中交第二航务工程局有限公司 Construction method for prefabricating composite structure of pier mounting plate pile under open marine environment
CN102943482A (en) * 2012-11-07 2013-02-27 中交第二航务工程局有限公司 Prefabricate abutment pre-tightening type sealing up cofferdam
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Publication number Priority date Publication date Assignee Title
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CN101225663A (en) * 2008-01-31 2008-07-23 山东省路桥集团有限公司 Steel boxed cofferdam and recovery method thereof
CN101775809A (en) * 2010-01-15 2010-07-14 中铁大桥局集团第五工程有限公司 Construction method of marine self-floating type steel soleplate single-wall suspension box cofferdam and single-wall suspension box cofferdam
CN102852094A (en) * 2012-08-31 2013-01-02 中交第二航务工程局有限公司 Construction method for prefabricating composite structure of pier mounting plate pile under open marine environment
CN102943482A (en) * 2012-11-07 2013-02-27 中交第二航务工程局有限公司 Prefabricate abutment pre-tightening type sealing up cofferdam
CN103362068A (en) * 2013-07-22 2013-10-23 中铁大桥局股份有限公司 Prefabricated bearing platform mounting method

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