CN102409690A - Construction method for synchronously lowering bottomless double-walled steel case cofferdam through multiple continuous jacks - Google Patents
Construction method for synchronously lowering bottomless double-walled steel case cofferdam through multiple continuous jacks Download PDFInfo
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- CN102409690A CN102409690A CN201110281642XA CN201110281642A CN102409690A CN 102409690 A CN102409690 A CN 102409690A CN 201110281642X A CN201110281642X A CN 201110281642XA CN 201110281642 A CN201110281642 A CN 201110281642A CN 102409690 A CN102409690 A CN 102409690A
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Abstract
The patent relates to a construction method for synchronously lowering a bottomless double-walled steel case cofferdam through multiple continuous jacks during the construction of a bridge foundation, which belongs to the technical field of the construction of the bridge foundations.The steps are as follows: the first step: constructing drilled piles; the second step: designing and processing the double-walled steel case cofferdam; the third step: performing assembly, height addition and lowering on the cofferdam; the fourth step: performing foundation cleaning and bottom sealing on the cofferdam; and the fifth step: constructing a support platform and pier bodies according to the conventional method after unwatering of the cofferdam. The key technology according to the invention is that the multiple continuous jacks are used in the third step for synchronously lowering a bottomless double-walled steel case, thereby having the characteristics of being smooth in lowering, being short in time consumption and being small in positioning deviation, greatly shortening the construction time, saving the cost, improving the efficiency, effectively solving the difficult problems of the lowering of the ultra-large cofferdam, the bed-contacting and the sinking precision control in a covering layer under unfavorable conditions of tidal stream with frequent hydrological changes and greater height different of a riverbed and the like and upgrading the mounting precision of the cofferdam. Xiangjiang Extra-large Bridge of Changsha-Xiangtan Expressway adopts the multiple continuous jacks for synchronously lowering the steel case cofferdam, thereby realizing the targets that the lowering of the cofferdam by 14m is only completed by three works in 12 hours and the deviation of the cofferdam from the center is less than 10cm.
Description
Technical field
The present invention relates to a kind of bridge foundation construction technical field, particularly a kind of many continuous jack are transferred the construction technology of double-walled steel boxed cofferdam of the no end synchronously.
Background technology
The embedding riverbed of cushion cap is darker, receives the influence of the depth of water and passing ships, has brought many difficult problems to construction.The side form of cofferdam during as the temporary water dash structure of bearing platform construction and cushion cap concreting, it transfers the accuracy of position and transfers the safety of process particularly important.The cofferdam is transferred general employing large-tonnage crane barge integral body and is transferred method: promptly earlier on the riverbank processing factory with cofferdam merogenesis, piecemeal processing and fabricating; Then piece spare is transported to place, pier position with vehicle through construction bridge; Utilize crawler crane that cofferdam piece spare is lifted to barge container and carry out spelling, with the large-tonnage crane barge cofferdam integral hoisting is transferred after spelling finishes.Simple to operate, the good integrity of this scheme, but the construction equipment needed thereby is more, need rent large-tonnage crane barge waterborne and barge container, cost is higher, and the cofferdam is in that to transfer process median-plane location skew wayward.
Technology contents
The objective of the invention is to solve the deficiency of prior art and provide a kind of safe and reliable, many continuous jack simple to operation are transferred the construction technology of double-walled steel boxed cofferdam of the no end synchronously.
A kind of many continuous jack are transferred the construction technology of double-walled steel boxed cofferdam of the no end synchronously, comprise the steps:
A, early-stage preparations: be equipped with on the support platform with on a plurality of jack of clamper and lower gripper; Said jack is by the unified control of hydraulic system, and steel strand pass clamper and lower gripper on the jack and end successively and are connected with suspension centre on first cofferdam;
Transfer in b, cofferdam:
1. transferring system debug: whether consistent, jack is carried out prestretching if detecting the flexible stroke of every jack, and whether suspension centre, jack clamper and cofferdam structure be normal on the inspection first segment cofferdam, check that errorless back removes the platform for lining in support first segment cofferdam;
2. transfer: when transferred in the first segment cofferdam, by the lower gripper locking steel strand of jack, jack master top piston upwards advanced earlier; Clamper was gone up in locking after jack master top piston put in place, opened lower gripper, and jack master top piston bounces back downwards; Make the cofferdam transfer, after piston retraction in jack master top puts in place, the locking lower gripper; Open main top, the clamper operation jin top piston return that upwards advances, circulation is once transferred in completion like this;
3. connect high cofferdam: 2. circulation step makes the first segment cofferdam transfer to preposition, and assembly unit connects high cofferdam on first cofferdam then, again repeating step 2. with step 3., transfer to the precalculated position up to whole cofferdam.
Among the present invention; Support platform described in the step a comprises that many are supported casing, assembling support and transfer support; Said support casing adopts flat couplet of steel pipe to be linked to be integral body; The periphery of said support platform and said first segment cofferdam are supported through the assembling support that is installed in the said support casing outside, are installed on the platform for lining of support platform after the cofferdam assembly unit of said first segment or the directly assembly unit on the platform for lining of support platform of first segment cofferdam, and the steel plate capping is used at the top of said support casing; Be equipped with on the said steel plate and transfer support, said transferring is equipped with jack on the support.
Among the present invention; Said step is transferred system debug in 1. and is specially, and the load when balance is transferred in the first segment cofferdam according to each jack earlier before beginning to transfer carries out prestretching one by one, after all jack are accomplished prestretching according to the payload values of calculating; The locking lower gripper; Jack master top piston is withdrawn into unified height and position downwards,, opens lower gripper then as the starting point of transferring of whole system; Whether clamper to open anchoring and first segment cofferdam structure that jack mentions anchor point and jack clamper on 3～5cm inspection first segment cofferdam with the first segment cofferdam normal in the locking, check the platform for lining in errorless back dismounting support first segment cofferdam.
Among the present invention, said jack symmetry on said support platform is evenly distributed, and the suspension centre on the said jack on clamper, lower gripper and the cofferdam is on same straight line.
Among the present invention, the wall body in said cofferdam is provided with a plurality of level gauges.
Adopt such scheme, action that goes round and begins again through hydraulic system and continuous jack two clampers up and down cooperate and hold the power exchange, and preposition is transferred in the cofferdam.When transferring, hydraulic oil pump is the power source of jack, equate because every table oil pump is supplied with the oil mass of each jack, and travel switch is housed on jack, thereby each jack has good net synchronization capability.In addition, several level gauges are set on the wall body in cofferdam, observe the synchronism that transfer in the cofferdam at any time, when the absolute altitude of finding certain point surpasses maximum allowable offset, system adjusted with the balance that guarantees the cofferdam and transfer.Thereby adopt many continuous jack to transfer the double-walled steel boxed cofferdam synchronously; Remedy large-tonnage crane barge integral body and transferred the defective of method; This technology can accurately be located large-scale steel boxed cofferdam under deep water, the complicated hydrology, geology, meteorological condition, can reduce working procedure again; And disturb less to the navigation channel; Can also accelerate construction period, reduce operating expenses, effectively control the cofferdam positioning accuracy and support casing sinking gradient, can solve preferably that deep water, stream are anxious, in the busy river of shipping, the problem that exists during large-scale highrise pile cap construction.
Description of drawings
Fig. 1 is a jack fundamental diagram of the present invention.
Fig. 2 is cofferdam of the present invention assembly unit, connects height and transfer flow chart.
Fig. 3 transfers the support layout plan for cofferdam of the present invention.
Fig. 4 arranges elevation for the present invention transfers jack.
Fig. 5 is a cofferdam of the present invention construction diagrams.
In the accompanying drawing 1 to 4,1, jack, 2, go up clamper, 3, steel strand, 4, lower gripper, 5, the cofferdam, 6, support casing, 7, transfer support, 8, platform for lining.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described further.
Embodiment:
Complete cofferdam construction comprises the first step: drilled pile construction; Second step: design of double-walled steel boxed cofferdam and processing; The 3rd step: the cofferdam assembly unit, connect height, transfer; The 4th step: the clear base in cofferdam, back cover; The 5th step: the back is drawn water by conventional method construction cushion cap and pier shaft in the cofferdam, and key technology of the present invention is the cofferdam assembly unit of the 3rd step, connects height, transfers, and particularly uses many continuous jack to transfer double-walled steel boxed cofferdam of the no end synchronously, specifies as follows:
As shown in Figure 2, the cofferdam assembly unit, connect height and the construction worker operation of a kind of embodiment of transferring is: high second and third joint cofferdam → head in assembly unit first segment cofferdam → connect saves the cofferdam and transfers → and the high fourth, fifth joint cofferdam → cofferdam of burying → connect, cofferdam is transferred and is put in place.Concrete technology is following:
1. early-stage preparations: as shown in Figure 4, will support the flat couplet of casing 6 usefulness φ 30cm steel pipes and be linked to be integral body.Support welding cofferdam platform for lining 8 on the casing 6 in the outside, it is material that platform for lining 8 adopts 2H45 shaped steel, and diagonal brace is as main bearing member in the employing, and the cradle top surface absolute altitude is+23m.The guiding device in cofferdam 5 adopts upper and lower double-deck guiding.Last leading truck is a fixed guide, is installed in to support on the casing 6, adopts worker's 28 shaped steel to be welded the long 3m of guide peg; Following guide peg is a mobile guide, is welded on cofferdam 5 inside bottom, and length is 1m.Upper and lower guiding device is in same plan-position, cofferdam.
As shown in Figure 3, install and to transfer support 7: cofferdam 5 is transferred support 7 and is employed in and supports casing 6 tops and go up the weld type steel bracket as main bearing member, supports casing 6 very useful steel plate cappings, as the mounting platform of transferring support 7.
Place system under the cofferdam: place system is made up of jack 1, hydraulic system and strength steel twisted wire 3 under the cofferdam, and hydraulic system comprises hydraulic oil pump and control system.The characteristics of following place system are the continuity and the synchronism of its work, and many jack 1 realize that each suspension centre promotes synchronous requirement, transfers to the precalculated position reposefully with cofferdam 5 under the control of oil pump.
The cofferdam assembly unit: assembly unit is vertically carried out by every joint in the first segment cofferdam on operating platform, the first segment cofferdam by the 80T crane barge from the bridge axis to the bilateral symmetry assembly unit.Assembly unit is as shown in Figure 5 in proper order, A1, A2, A3 → A6, A7, A8 → A4, A5 → A9, A10.
2. weld suspension centre: first segment cofferdam 5 is provided with the suspension centre corresponding with jack 1; The position of suspension centre is corresponding with the position of jack 1; Hydraulic system can adapt to 6 requirements that the suspension centre lift stroke is synchronous, and the same suspension centre of hydraulic system ability automatic equalization promotes the bearing capacity of jack simultaneously.Every pumping plant is given 6 lifting jack fuel feeding of 6 suspension centres respectively, and regulates fuel feeding by the control signal that the control system sends for respectively the master cylinder of corresponding jack, clamper.The operating pressure of this hydraulic system all is lower than the rated pressure of jack, oil pump and valve member, makes the said equipment have suitable capacity reserve.On all jack, be provided with hydraulic lock, when fortuitous events such as power failure or pipeline rupture take place, can make the jack cylinder self-locking, guarantee cofferdam safety.When normally transferring, upper and lower holder is in the state of opening or closing respectively, like special circumstances, can upper and lower clamper all be locked by manual work, makes intermediate plate locking steel strand, guarantees to transfer structural safety.
3. place system down is installed: as shown in Figure 4, support casings at 6 and transfer that 1 specified lifting force respectively is set on the support 7 is 100 tons jack.As shown in Figure 1; 10
15.24 intensity of every jack configuration are the steel strand of 1860Mpa level; The suspension centre that steel strand pass clamper, jack, lower gripper successively, transfer on support and the cofferdam is connected to form load supporting system; For guaranteeing the rationally stressed of steel strand,, jack 1 make suspension centre on jack 1 upper and lower clamper 2,4 and the cofferdam 5 when being installed with suspension centre on same straight line.During installation: after jack 1, oil pump are in place; One of steel strand 3 is passed jack 1, goes up to be installed on the steel strand 3 behind clamper 2 and the lower gripper 4 connector is installed; When upper and lower clamper 2,4 is in open mode; Transfer steel strand 3 then, again connector is connected with cofferdam 5 suspension centres.
4. transfer system debug and first the lifting: before transfer in cofferdam 5, Hoisting System is debugged, in shape with the duty of confirming every jack 1, and whether detect each jack 1 flexible stroke consistent.Load when 5 balances are transferred in the cofferdam according to each jack 1 earlier before beginning to transfer carries out prestretching one by one.After all jack 1 were accomplished prestretching according to the payload values of calculating, locking lower gripper 4 was withdrawn into unified height and position downwards with main top piston, as the starting point of transferring of whole system.Whether then the anchoring and the cofferdam structure of anchor point and jack 1 clamper on the 3～5cm inspection cofferdam mentioned in the cofferdam normal.Check that the platform for lining that the cofferdam is removed in errorless back formally begins to transfer.
5. transfer in the cofferdam: when transferred in the first segment cofferdam, the lower gripper by jack clamped steel strand earlier, and main top piston upwards advances; Clamp after piston puts in place and go up clamper, main top piston continues upwards to advance 3cm, opens lower gripper; Main top piston bounces back downwards, and transfer in the first segment cofferdam, after piston retraction in main top puts in place; Lower gripper clamps steel strand once more, accomplishes and once transfers circulation.Transfer when the first segment cofferdam and to accomplish the back and on the first segment cofferdam, connect high second and third joint cofferdam, continue to transfer the cofferdam, when first, second and third save cofferdam transfer put in place after; Connect high fourth, fifth joint cofferdam again; Continue to transfer the cofferdam, make the cofferdam all transfer and put in place, above-mentioned cofferdam connects high technology and just connects high getting final product according to original technology; Through the action that hydraulic system is gone round and begun again, make the cofferdam transfer to preposition.Hydraulic oil pump is the power source of jack when transferring, and equate because every table oil pump is supplied with the oil mass of each jack, and travel switch is housed on jack, thereby each jack has good net synchronization capability.In addition, several level gauges are set on the wall body in cofferdam, observe the synchronism that transfer in the cofferdam at any time, when the absolute altitude of finding certain point surpasses maximum allowable offset, system adjusted with the balance that guarantees the cofferdam and transfer.
Claims (5)
1. more than one kind continuous jack transferred the construction technology of double-walled steel boxed cofferdam of the no end synchronously, it is characterized in that: comprise the steps:
A, early-stage preparations: be equipped with on the support platform with on a plurality of jack of clamper and lower gripper; Said jack is by the unified control of hydraulic system, and steel strand pass clamper and lower gripper on the jack and end successively and are connected with suspension centre on first cofferdam;
Transfer in b, cofferdam:
1. transferring system debug: whether consistent, jack is carried out prestretching if detecting the flexible stroke of every jack, and whether suspension centre, jack clamper and cofferdam structure be normal on the inspection first segment cofferdam, check that errorless back removes the platform for lining in support first segment cofferdam;
2. transfer: when transferred in the first segment cofferdam, by the lower gripper locking steel strand of jack, jack master top piston upwards advanced earlier; Clamper was gone up in locking after jack master top piston put in place, opened lower gripper, and jack master top piston bounces back downwards; Make the cofferdam transfer, after piston retraction in jack master top puts in place, the locking lower gripper; Open main top, the clamper operation jin top piston return that upwards advances, circulation is once transferred in completion like this;
3. connect high cofferdam: 2. circulation step makes the first segment cofferdam transfer to preposition, and assembly unit connects high cofferdam on first cofferdam then, again repeating step 2. with step 3., transfer to the precalculated position up to whole cofferdam.
2. construction technology according to claim 1; It is characterized in that: support platform described in the step a comprises that many are supported casing, assembling support and transfer support; Said support casing adopts flat couplet of steel pipe to be linked to be integral body; The periphery of said support platform and said first segment cofferdam are supported through the assembling support that is installed in the said support casing outside; Be installed on the platform for lining of support platform after the cofferdam assembly unit of said first segment or the directly assembly unit on the platform for lining of support platform of first segment cofferdam, shown in support on the casing guiding device that is connected with said first segment cofferdam be installed, the steel plate capping is used at the top of said support casing; Be equipped with on the said steel plate and transfer support, said transferring is equipped with jack on the support.
3. construction technology according to claim 1; It is characterized in that: said step is transferred system debug in 1. and is specially; Load when balance is transferred in the first segment cofferdam according to each jack earlier before beginning to transfer carries out prestretching one by one; After all jack were accomplished prestretching according to the payload values of calculating, the locking lower gripper was withdrawn into unified height and position downwards with jack master top piston; The starting point of transferring as whole system; Open lower gripper then, whether clamper to open anchoring and first segment cofferdam structure that jack mentions anchor point and jack clamper on 3～5cm inspection first segment cofferdam with the first segment cofferdam normal in the locking, check the platform for lining in errorless back dismounting support first segment cofferdam.
4. construction technology according to claim 2 is characterized in that: said jack symmetry on said support platform is evenly distributed, and the suspension centre on the said jack on clamper, lower gripper and the cofferdam is on same straight line.
5. construction technology according to claim 1 is characterized in that: the wall body in said cofferdam is provided with a plurality of level gauges.
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| CN201110281642XA CN102409690A (en) | 2011-09-21 | 2011-09-21 | Construction method for synchronously lowering bottomless double-walled steel case cofferdam through multiple continuous jacks |
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| CN201110281642XA CN102409690A (en) | 2011-09-21 | 2011-09-21 | Construction method for synchronously lowering bottomless double-walled steel case cofferdam through multiple continuous jacks |
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| CN102644290A (en) * | 2012-05-14 | 2012-08-22 | 中国十九冶集团有限公司 | Steel cofferdam construction method suitable for deep silt-layer bridge construction in shallow sea area |
| CN102864779A (en) * | 2012-10-25 | 2013-01-09 | 中铁上海工程局有限公司第五分公司 | Method for synchronously controlling sinking double-wall steel cofferdam by jack |
| CN103993619A (en) * | 2014-05-08 | 2014-08-20 | 湖北兴达路桥股份有限公司 | Desilting, blowing and sand sucking device for construction of bridge foundation steel cofferdam |
| CN104805857A (en) * | 2015-05-06 | 2015-07-29 | 中铁十六局集团第三工程有限公司 | Detachable cyclic utilization bottomless steel jacket box and construction method thereof |
| CN105970983A (en) * | 2016-06-13 | 2016-09-28 | 中交第二航务工程局有限公司 | Cast-in-place concrete diversion cofferdam with non-bottom steel sleeve boxes and construction method thereof |
| CN107034908A (en) * | 2017-06-20 | 2017-08-11 | 中铁二十四局集团新余工程有限公司 | A kind of steel boxed cofferdam integral elevating equipment |
| CN107059900A (en) * | 2017-03-23 | 2017-08-18 | 中建三局基础设施工程有限公司 | The construction method that a kind of Double-wall sin-gle-image radiography quickly sinks in sand-pebble layer |
| CN107059901A (en) * | 2017-05-24 | 2017-08-18 | 中铁十六局集团第三工程有限公司 | A kind of steel jacket box and its cofferdam method |
| CN107869144A (en) * | 2017-11-17 | 2018-04-03 | 中铁二十二局集团第四工程有限公司 | A kind of pre- slotting ring seal Double-Wall Steel Boxed Cofferdam deep water foundation comprehensive construction method |
| CN108179735A (en) * | 2018-02-28 | 2018-06-19 | 中国葛洲坝集团第五工程有限公司 | A kind of boulder bed large-sized deep water foundation construction platform and method |
| CN108179758A (en) * | 2017-12-12 | 2018-06-19 | 中国建筑第四工程局有限公司 | A kind of construction technology of novel quick-assembling self-floating prestressing force steel reinforced concrete combination precast-boxed cofferdam |
| CN108396754A (en) * | 2018-04-08 | 2018-08-14 | 中交路桥建设有限公司 | A kind of floating construction method for spelling steel cofferdam and its lower water of suspention |
| CN108532608A (en) * | 2018-04-04 | 2018-09-14 | 中铁四局集团第二工程有限公司 | A kind of embedding batholith plinth Double-Wall Steel Boxed Cofferdam precise positioning of deep water drilling bed process |
| CN108867672A (en) * | 2018-08-24 | 2018-11-23 | 中国建筑第四工程局有限公司 | A kind of Double-Wall Steel Boxed Cofferdam joining method |
| CN108978690A (en) * | 2018-08-24 | 2018-12-11 | 中国建筑第四工程局有限公司 | A kind of bridge steel cofferdam decentralization stand construction method |
| CN110409477A (en) * | 2019-07-12 | 2019-11-05 | 中铁大桥勘测设计院集团有限公司 | A kind of steel lifted trunk anti-surge interior support system and its construction method |
| CN114263199A (en) * | 2021-12-16 | 2022-04-01 | 中交三公局第三工程有限公司 | Steel cofferdam for lowering double walls of bare rock and shallow-covering-layer river section through jack |
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| CN102644290A (en) * | 2012-05-14 | 2012-08-22 | 中国十九冶集团有限公司 | Steel cofferdam construction method suitable for deep silt-layer bridge construction in shallow sea area |
| CN102864779A (en) * | 2012-10-25 | 2013-01-09 | 中铁上海工程局有限公司第五分公司 | Method for synchronously controlling sinking double-wall steel cofferdam by jack |
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| CN107059901A (en) * | 2017-05-24 | 2017-08-18 | 中铁十六局集团第三工程有限公司 | A kind of steel jacket box and its cofferdam method |
| CN107059901B (en) * | 2017-05-24 | 2022-08-09 | 中铁十六局集团第三工程有限公司 | Steel casing and cofferdam method thereof |
| CN107034908A (en) * | 2017-06-20 | 2017-08-11 | 中铁二十四局集团新余工程有限公司 | A kind of steel boxed cofferdam integral elevating equipment |
| CN107869144A (en) * | 2017-11-17 | 2018-04-03 | 中铁二十二局集团第四工程有限公司 | A kind of pre- slotting ring seal Double-Wall Steel Boxed Cofferdam deep water foundation comprehensive construction method |
| CN108179758A (en) * | 2017-12-12 | 2018-06-19 | 中国建筑第四工程局有限公司 | A kind of construction technology of novel quick-assembling self-floating prestressing force steel reinforced concrete combination precast-boxed cofferdam |
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Application publication date: 20120411 |