CN104018512A - Open caisson sinking construction method slightly disturbing environment - Google Patents
Open caisson sinking construction method slightly disturbing environment Download PDFInfo
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- CN104018512A CN104018512A CN201410261230.3A CN201410261230A CN104018512A CN 104018512 A CN104018512 A CN 104018512A CN 201410261230 A CN201410261230 A CN 201410261230A CN 104018512 A CN104018512 A CN 104018512A
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Abstract
The invention relates to an open caisson sinking construction method slightly disturbing environment. The construction method comprises the specific steps of 1, cast-in-place pile counter-force ground anchor construction, 2, preparation work before an open caisson is sunk, 3, counter-force pull rod installation, 4, adjustment of pressure of a center hole jack, 5, soil excavating after the open caisson is pressed to be sunk, 6, press-sinking construction, and 7, dismounting of a press-sinking device after the open caisson is pressed to be sunk to a designed elevation, and subsequent construction after open caisson sinking. According to the novel open caisson sinking construction method, compared with a traditional open caisson sinking mode, jack deviation correction and soil excavating are combined, the overall stability and safety of the open caisson are improved, the sinking state of the open caisson can be effectively controlled, sinking of the open caisson is uniform and stable, and precision is higher; a counter-force device is used for adjusting sinking coefficient of the open caisson, open caisson sinking speed can be greatly increased, the construction period is shortened, work efficiency is improved, and cost is saved; soil plugs are reserved in the open caisson, disturbance of sinking of the open caisson to surrounding soil can be reduced, and the surrounding environment is effectively protected.
Description
Technical field
The present invention relates to a kind of caisson sinking construction method that building operations is used, especially a kind of to the efficient sinking construction method of the moving open caisson of environment micro-turbulence.
Background technology
The features such as open caisson is due to its Stability Analysis of Structures, and cost is lower have been widely applied to municipal administration, the industrial circles such as water supply, draining, electric power.On the one hand, along with the progressively raising of caisson sinking construction technique, the underground space of open caisson application becomes increasingly complex, the unconventional field of passing through is more and more broader etc.On the other hand, because caisson sinking construction not can solve the excessive problem of surrounding enviroment disturbance always, limited its application under responsive location or complicated soil layer external condition.In addition the enhancing of people to environmental protection consciousness, existing well sinking technology is more and more difficult to meet the construction requirement day by day improving.Therefore well sinking technique will be reformed to some extent.Current caisson sinking construction technique is super dark and reduce aspect disturbance and exist larger defect, and the reason of generation is just the deficiency of subsidence factor.If at drainage sink not and retain well sinking under certain soil plug thickness condition still there is enough subsidence factors in well, can greatly improve efficiency of construction, reduce costs and reduce the disturbance to the outside soil body.In addition, traditional caisson sinking construction technique easily produces and is prominent heavy, and the sinking construction duration is longer, and efficiency of construction is not high.Under this background, be badly in need of the new-type caisson sinking construction method of research and development, make open caisson there is enough subsidence factors, this downforce is enough to eliminate all adverse effect of soil layer to its generation, can dominate the sinking of open caisson, accelerate efficiency of construction, and reduce the impact on environment.
Summary of the invention
The present invention will solve existing well sinking technology to be more and more difficult to meet the construction requirement day by day improving, easily produce and prominent sinking, the sinking construction duration is longer, and efficiency of construction is not high, the problem such as have greater environmental impacts, and a kind of caisson sinking construction method moving to environment micro-turbulence is provided.
For achieving the above object, technical scheme of the present invention is:
A caisson sinking construction method moving to environment micro-turbulence, Specific construction step is:
1) castinplace pile counter-force earth anchor construction
Construction drill castinplace pile forms counter-force earth anchor, and guarantees that the position at Zhuan center overlaps with punching jack center;
2) open caisson starts the preparation before sinking
Before open caisson starts to sink, device therefor and system are in place, and punching jack hydraulic system is debugged;
3) counter-force pull bar is installed
According to well sinking level configurations counter-force pull bar, from surface drilling castinplace pile top, be connected to mutually open caisson pressure-bearing " bracket ", when counter-force pull bar is installed, counter member upper end should and open caisson wall on the distance of reserved 10cm between pressure-bearing " bracket ", make open caisson when starting to draw brick fetal membrane, can have certain degree of depth of drowning oneself;
4) adjust the pressure size of punching jack
According to the measurement result of the open caisson discrepancy in elevation and inclination, adjust the pressure size of the jack of each point, slowly to the open caisson operation of rectifying a deviation;
5) first pressure fetches earth after sinking
Punching jack starts slowly open caisson to be exerted pressure, and when top power to predetermined value cannot be sunk, starts suction mud in well; During construction, feeler lever utilizes big nut to be anchored at jack cylinder upper end through after punching jack in jack upper end; When needs pressure is heavy, jack cylinder protrudes upward and withstands nut, after feeler lever tension, makes pressure-bearing on the jack pair borehole wall " bracket " produce a downward pressure, impels well sinking;
6) press heavy construction
(1) in pressing heavy process, jack cylinder upwards withstands upper end anchoring nut, counter-force pull bar transmission of pressure is to uplift pile, go up pressure-bearing " bracket " and be subject to downward pressure simultaneously, impel well sinking, after oil cylinder stroke of caisson sinking, jack cylinder is retracted, by upper end nut backspin 20cm, and so forth;
(2) after the about 1.7m degree of depth of every sinking, need to remove a joint and replace pull bar, the top pull bar of working is connected with next section of replacement pull bar, start next press to sink circulate, until be sink to design elevation.In sinking construction process, and splash the height of measurement.
7) pressure is removed the heavy equipment of pressure after being sink to design elevation, carries out the follow-up construction of open caisson.
Above-mentioned open caisson presses sinking construction method also can improve the adhesion strength of pile body pile body and the soil body by slip casting is carried out in drilled pile pile body outside, thereby significantly improves the uplift resistance of stake.
In the heavy well construction method of above-mentioned pressure, in order to make open caisson possess higher subsidence factor, regulate space, by increasing soil plug, reach anti-object of gushing, the pressure of the inside and outside soil body of balance well, prevents the outer soil body of open caisson and pours in the phenomenon in well.
In the heavy well construction method of above-mentioned pressure, adopt thixotropic slurry to help heavy method, by peripheral mud sleeve is set, plays a part to reduce frictional force and safeguard soil wall stability.
The invention has the beneficial effects as follows: the invention provides a kind of new-type caisson sinking construction method, the present invention compares with traditional well sinking mode, jack correction and the combination of being unearthed, resistance to overturning and the safety of open caisson have been improved, can effectively control well sinking attitude, well sinking uniform and stable, and precision is higher; By counterforce device, regulate the subsidence factor of open caisson, can significantly improve well sinking speed, reduction of erection time, increase work efficiency, save the duration and save cost; Can realize the inner reserved soil plug of open caisson, can reduce the disturbance of well sinking to the periphery soil body, effectively protect surrounding enviroment.
Accompanying drawing explanation
Fig. 1 is that open caisson of the present invention is pressed heavy each Plant arrangement schematic diagram of construction.
The specific embodiment
Below in conjunction with accompanying drawing and concrete embodiment, further set forth the present invention.
As shown in Figure 1, of the present invention to the efficient sinking construction method of the moving open caisson of environment micro-turbulence, concrete construction method and step are:
(1) construction drill castinplace pile 6 forms counter-force earth anchor, must strictly control the verticality of stake, guarantees that the position at Zhuan center overlaps with punching jack 1 center.
(2) before open caisson starts to sink, each system should be in place, and jack hydraulic system is carried out to corresponding equipment debugging.
(3), according to well sinking level configurations counter-force pull bar, from surface drilling castinplace pile top, be connected to mutually open caisson pressure-bearing " bracket ".When counter-force pull bar is installed, rod member upper end should and open caisson wall 7 on the distance of reserved 10cm left and right between pressure-bearing " bracket ", make open caisson when starting to draw brick fetal membrane, can have certain degree of depth of drowning oneself.
(4), according to the measurement result of the open caisson discrepancy in elevation and inclination, adjust the pressure size of the punching jack 1 of each point, slowly to the open caisson operation of rectifying a deviation.
(5) first pressure fetches earth after sinking.Punching jack 1 starts slowly open caisson to be exerted pressure, and when top power to predetermined value cannot be sunk, starts suction mud in well.During construction, feeler lever utilizes big nut to be anchored at jack cylinder upper end through after punching jack 1 in jack upper end.When needs pressure is heavy, jack cylinder protrudes upward and withstands nut, after feeler lever tension, makes the pressure-bearing " bracket " on 1 pair of borehole wall 7 of punching jack produce a downward pressure, impels well sinking.
(6) in pressing heavy process, jack cylinder upwards withstands upper end anchoring nut, and counter-force pull bar transmission of pressure is to uplift pile.Pressure-bearing " bracket " is subject to downward pressure simultaneously, impels well sinking.After oil cylinder stroke of caisson sinking (about 20cm), jack cylinder is retracted, by the about 20cm of upper end nut backspin, and so forth.
(7) the attaching nut's size between upper and lower pull bar is larger, can not pass the pull bar preformed hole of pressure-bearing " bracket ", after the about 1.7m degree of depth of every sinking, need to remove a joint and replace pull bar 3(length 1.7m), by the top pull bar 2(length 3.7m that works) be connected with next section of replacement pull bar 3, start the next heavy circulation of pressing, until be sink to design elevation.In sinking construction process, should splash the height of measurement.
(8) pressure is removed the heavy equipment of pressure after being sink to design elevation, carries out the follow-up construction of open caisson.
Above-mentioned open caisson presses sinking construction method also can significantly improve the adhesion strength of pile body pile body and the soil body by slip casting is carried out in drilled pile pile body outside, thereby significantly improves the uplift resistance of stake; Take to press heavy well construction technique, open caisson possesses higher subsidence factor and regulates space, can fill in to reach anti-object of gushing by increasing suitable soil, and the pressure of the inside and outside soil body of balance well, pours in the phenomenon in well thereby prevent the outer soil body of open caisson; It is a kind of heavy drag reduction method that helps preferably that thixotropic slurry helps heavy method, by peripheral mud sleeve is set, plays a part to reduce frictional force and safeguards soil wall stability.
Application implementation example of the present invention:
Three active wells of Shanghai ultra-large type pipe-jacking project, the reinforced concrete circular open caisson of external diameter Φ 24m, is highly 18.68m; External diameter is the reinforced concrete circular open caisson of Φ 19.8m, is highly 18.59m; Planar dimension is the rectangle reinforced concrete open caisson of 18.2 * 11.2m, is highly 18.52m.Three open caissons are all to make for three times, once sink, and are the forced sinking construction technique of domestic first Application open caisson.
Apply of the present invention to the efficient sinking construction method of the moving open caisson of environment micro-turbulence, control open caisson attitude easily and precision very high, the eventually heavy discrepancy in elevation is less than 3/1000ths; Subsidence velocity is fast, by pressure sinking device, increases the subsidence factor of open caisson, has significantly improved well sinking speed, has reached in actual applications the fastest one day speed of three meters; Little to outside soil disturbance, by counter force system, make the degree of depth of caisson cutting edge injection soil layer darker, thereby make the inherent soil plug while that keeps higher of open caisson still there is enough subsidence factors, in case, the important pipe settlement at distance open caisson 7m place is only 4mm.Application the present invention has not only completed sinking construction task, and has improved greatly efficiency of construction and quality, for later super dark, complicated geological and the higher sinking well engineering of environmental protection requirement have been opened up invaluable experience.
Claims (4)
1. a caisson sinking construction method moving to environment micro-turbulence, is characterized in that, Specific construction step is:
1) castinplace pile counter-force earth anchor construction
Construction drill castinplace pile forms counter-force earth anchor, and guarantees that the position at Zhuan center overlaps with punching jack center;
2) open caisson starts the preparation before sinking
Before open caisson starts to sink, device therefor and system are in place, and punching jack hydraulic system is debugged;
3) counter-force pull bar is installed
According to well sinking level configurations counter-force pull bar, from surface drilling castinplace pile top, be connected to mutually open caisson pressure-bearing " bracket ", when counter-force pull bar is installed, counter member upper end should and open caisson wall on the distance of reserved 10cm between pressure-bearing " bracket ", make open caisson when starting to draw brick fetal membrane, can have certain degree of depth of drowning oneself;
4) adjust the pressure size of punching jack
According to the measurement result of the open caisson discrepancy in elevation and inclination, adjust the pressure size of the punching jack of each point, slowly to the open caisson operation of rectifying a deviation;
5) first pressure fetches earth after sinking
Punching jack starts slowly open caisson to be exerted pressure, and when top power to predetermined value cannot be sunk, starts suction mud in well; During construction, feeler lever utilizes big nut to be anchored at jack cylinder upper end through after punching jack in jack upper end; When needs pressure is heavy, jack cylinder protrudes upward and withstands nut, after feeler lever tension, makes pressure-bearing on the jack pair borehole wall " bracket " produce a downward pressure, impels well sinking;
6) press heavy work progress
(1) in pressing heavy process, jack cylinder upwards withstands upper end anchoring nut, counter-force pull bar transmission of pressure is to uplift pile, go up pressure-bearing " bracket " and be subject to downward pressure simultaneously, impel well sinking, after oil cylinder stroke of caisson sinking, jack cylinder is retracted, by upper end nut backspin 20cm, and so forth;
(2) after the about 1.7m degree of depth of every sinking, need to remove a joint and replace pull bar, the top pull bar of working is connected with next section of replacement pull bar, start next press to sink circulate, until be sink to design elevation;
In sinking construction process, and splash the height of measurement;
7) pressure is removed the heavy equipment of pressure after being sink to design elevation, carries out the follow-up construction of open caisson.
2. the caisson sinking construction method moving to environment micro-turbulence according to claim 1, it is characterized in that: above-mentioned open caisson pressure sinking construction method also can be by carrying out slip casting to drilled pile pile body outside, improve the adhesion strength of pile body pile body and the soil body, thereby significantly improve the uplift resistance of stake.
3. the caisson sinking construction method moving to environment micro-turbulence according to claim 1, it is characterized in that: in the heavy well construction method of above-mentioned pressure, in order to make open caisson possess higher subsidence factor, regulate space, by increasing soil plug, reach anti-object of gushing, the pressure of the inside and outside soil body of balance well, prevents the outer soil body of open caisson and pours in the phenomenon in well.
4. the caisson sinking construction method moving to environment micro-turbulence according to claim 1, it is characterized in that: in the heavy well construction method of above-mentioned pressure, adopt thixotropic slurry to help heavy method, by peripheral mud sleeve is set, plays a part to reduce frictional force and safeguard soil wall stability.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105201003A (en) * | 2015-10-15 | 2015-12-30 | 北京中岩大地科技股份有限公司 | Sunk well construction method and sunk well dismantling method |
| JP2016075126A (en) * | 2014-10-09 | 2016-05-12 | 英昭 山岸 | Jack system and immersion method of skeleton |
| CN105970985A (en) * | 2016-05-27 | 2016-09-28 | 广州中国科学院工业技术研究院 | Sunk well for muddy water mud flat and mounting method thereof |
| CN106759417A (en) * | 2016-11-10 | 2017-05-31 | 上海城建市政工程（集团）有限公司 | A kind of construction method of forced open caisson |
| CN107165182A (en) * | 2017-05-31 | 2017-09-15 | 上海市政建设有限公司 | Heavy stage deviation-rectifying system and its application method at the beginning of a kind of open caisson |
| CN107288140A (en) * | 2017-08-01 | 2017-10-24 | 中交武汉港湾工程设计研究院有限公司 | The steel cofferdam constructing device that actively sinking is rectified a deviation and construction method |
| CN107620313A (en) * | 2017-11-15 | 2018-01-23 | 扬州市江都永坚有限公司 | Static pressure open caisson device |
| CN109235477A (en) * | 2018-10-26 | 2019-01-18 | 中铁工程装备集团有限公司 | A kind of section of jurisdiction pressure-raising device and its pressure-raising method suitable for open caisson construction method |
| CN111549885A (en) * | 2020-05-15 | 2020-08-18 | 矿冶科技集团有限公司 | Pipe head, and immersed pipe construction device and method in fine grain tailing pond |
| CN111945764A (en) * | 2020-06-30 | 2020-11-17 | 中国二十冶集团有限公司 | Ground anchor press-in type well sinking method |
| CN114319405A (en) * | 2021-12-10 | 2022-04-12 | 上海市基础工程集团有限公司 | Construction method for micro-disturbance vertical press-in type thin-wall open caisson in complex environment |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016075126A (en) * | 2014-10-09 | 2016-05-12 | 英昭 山岸 | Jack system and immersion method of skeleton |
| CN105201003B (en) * | 2015-10-15 | 2018-04-20 | 北京中岩大地科技股份有限公司 | A kind of open caisson construction method and method for dismounting |
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| CN105970985A (en) * | 2016-05-27 | 2016-09-28 | 广州中国科学院工业技术研究院 | Sunk well for muddy water mud flat and mounting method thereof |
| CN106759417A (en) * | 2016-11-10 | 2017-05-31 | 上海城建市政工程（集团）有限公司 | A kind of construction method of forced open caisson |
| CN107165182A (en) * | 2017-05-31 | 2017-09-15 | 上海市政建设有限公司 | Heavy stage deviation-rectifying system and its application method at the beginning of a kind of open caisson |
| CN107288140A (en) * | 2017-08-01 | 2017-10-24 | 中交武汉港湾工程设计研究院有限公司 | The steel cofferdam constructing device that actively sinking is rectified a deviation and construction method |
| CN107620313A (en) * | 2017-11-15 | 2018-01-23 | 扬州市江都永坚有限公司 | Static pressure open caisson device |
| CN107620313B (en) * | 2017-11-15 | 2022-12-23 | 扬州市江都永坚有限公司 | Static pressure open caisson device |
| CN109235477A (en) * | 2018-10-26 | 2019-01-18 | 中铁工程装备集团有限公司 | A kind of section of jurisdiction pressure-raising device and its pressure-raising method suitable for open caisson construction method |
| CN111549885A (en) * | 2020-05-15 | 2020-08-18 | 矿冶科技集团有限公司 | Pipe head, and immersed pipe construction device and method in fine grain tailing pond |
| CN111945764A (en) * | 2020-06-30 | 2020-11-17 | 中国二十冶集团有限公司 | Ground anchor press-in type well sinking method |
| CN114319405A (en) * | 2021-12-10 | 2022-04-12 | 上海市基础工程集团有限公司 | Construction method for micro-disturbance vertical press-in type thin-wall open caisson in complex environment |
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