CN104018512B - The caisson sinking construction method dynamic to environment micro-turbulence - Google Patents
The caisson sinking construction method dynamic to environment micro-turbulence Download PDFInfo
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- CN104018512B CN104018512B CN201410261230.3A CN201410261230A CN104018512B CN 104018512 B CN104018512 B CN 104018512B CN 201410261230 A CN201410261230 A CN 201410261230A CN 104018512 B CN104018512 B CN 104018512B
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Abstract
The present invention relates to a kind of caisson sinking construction method dynamic to environment micro-turbulence, Specific construction step is: 1. castinplace pile counter-force earth anchor construction, 2. open caisson starts the preparation before sinking, 3. counter-force pull bar is installed, 4. adjust the pressure size of punching jack, 5. first pressure fetches earth after sinking, 6. the heavy work progress of pressure, 7. pressure removes the heavy equipment of pressure after being sink to design elevation, carries out open caisson subsequent construction.The invention provides a kind of new-type caisson sinking construction method, the present invention is compared with traditional well sinking mode, and jack correction combines with unearthed, improve resistance to overturning and the safety of open caisson, can effectively control well sinking attitude, well sinking uniform and stable, and precision is higher; Regulated the subsidence factor of open caisson by counterforce device, can significantly improve well sinking speed, reduction of erection time, increase work efficiency, save the duration and save cost; Open caisson internal reservation soil plug can be realized, the disturbance of well sinking to the periphery soil body can be reduced, available protecting surrounding enviroment.
Description
Technical field
The present invention relates to a kind of caisson sinking construction method of building operations, especially a kind of open caisson efficient sinking construction method dynamic to environment micro-turbulence.
Background technology
Open caisson is due to its Stability Analysis of Structures, and the features such as 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, unconventional field of passing through is more and more broader etc.On the other hand, the problem excessive to surrounding enviroment disturbance due to caisson sinking construction not can solve always, limits its application under responsive location or complex random systems external condition.In addition people are to the enhancing of environmental protection consciousness, and existing well sinking technology is more and more difficult to meet the construction requirement day by day improved.Therefore well sinking technique will be reformed to some extent.Current caisson sinking construction technique also exists larger defect in ultra-deep and minimizing disturbance, and Producing reason is just the deficiency of subsidence factor.If well sinking still has enough subsidence factors at non-drainage subsidence and retain certain soil plug thickness condition in well under, then can greatly improve efficiency of construction, reduce costs and decrease the disturbance to the outside soil body.In addition, traditional caisson sinking construction technique easily produces and dashes forward sinks, and the sinking construction duration is longer, and efficiency of construction is not high.In this context, be badly in need of the caisson sinking construction method that research and development are new-type, make open caisson have enough subsidence factors, this downforce is enough to all adverse effects that elimination soil layer produces it, namely 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 improved, easy generation is tilted and is dashed forward and sinks, and the sinking construction duration is longer, and efficiency of construction is not high, the problem such as have greater environmental impacts, and provide a kind of caisson sinking construction method dynamic to environment micro-turbulence.
For achieving the above object, technical scheme of the present invention is:
A caisson sinking construction method dynamic 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 ensures that the position at the center of stake overlaps with punching jack center;
2) open caisson starts the preparation before sinking
Before open caisson starts sinking, device therefor and system are in place, and debug punching jack hydraulic system;
3) counter-force pull bar is installed
According to well sinking level configurations counter-force pull bar, open caisson pressure-bearing " bracket " is connected to mutually from surface drilling castinplace pile top, 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 ", enable open caisson starting there is certain degree of depth of drowning oneself when drawing brick fetal membrane;
4) the pressure size of punching jack is adjusted
The measurement result of the foundation open caisson discrepancy in elevation and inclination, adjusts the pressure size of the jack of each point, slowly carries out correction operation to open caisson;
5) first pressure fetches earth after sinking
Punching jack starts slowly to apply pressure to open caisson, when top power cannot be sunk to predetermined value, starts to inhale 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 " bracket " on the jack pair borehole wall produce a downward pressure, impels well sinking;
6) the heavy construction of pressure
(1) carrying out pressing in 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 " simultaneously and be subject to downward pressure, impel well sinking, when after caisson sinking oil cylinder stroke, jack cylinder is retracted, by upper end nut backspin 20cm, and so forth;
(2) after the about 1.7m degree of depth of often sinking, need remove a joint and replace pull bar, the pull bar that worked on top is connected with next section of replacement pull bar, starts the heavy circulation of next pressure, until be sink to design elevation.In sinking construction process, and splash the height of measurement.
7) pressure removes the heavy equipment of pressure after being sink to design elevation, carries out open caisson subsequent construction.
Above-mentioned open caisson pressure sinking construction method, also by carrying out slip casting to drilled pile pile body outside, improving the adhesion strength of pile body pile body and the soil body, thus significantly improving 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 adjustment space, reaching anti-object of gushing by increasing soil plug, the pressure of the soil body inside and outside balance well, preventing the soil body outside open caisson and pouring in the phenomenon in well.
In the heavy well construction method of above-mentioned pressure, adopting thixotropic slurry to help heavy method, playing a part reduce frictional force and safeguard soil wall stability by arranging peripheral mud sleeve.
The invention has the beneficial effects as follows: the invention provides a kind of new-type caisson sinking construction method, the present invention is compared with traditional well sinking mode, jack correction combines with unearthed, improve resistance to overturning and the safety of open caisson, can effectively control well sinking attitude, well sinking uniform and stable, and precision is higher; Regulated the subsidence factor of open caisson by counterforce device, can significantly improve well sinking speed, reduction of erection time, increase work efficiency, save the duration and save cost; Open caisson internal reservation soil plug can be realized, the disturbance of well sinking to the periphery soil body can be reduced, available protecting surrounding enviroment.
Accompanying drawing explanation
Fig. 1 is each Plant arrangement schematic diagram of the heavy construction of open caisson of the present invention pressure.
Detailed description of the invention
Below in conjunction with accompanying drawing and concrete embodiment, set forth the present invention further.
As shown in Figure 1, the open caisson efficient sinking construction method dynamic to environment micro-turbulence of the present invention, concrete construction method and step are:
(1) construction drill castinplace pile 6 forms counter-force earth anchor, strictly must control the verticality of stake, ensures that the position at the center of stake overlaps with punching jack 1 center.
(2), before open caisson starts sinking, each system should be in place, and carries out corresponding equipment debugging to jack hydraulic system.
(3) according to well sinking level configurations counter-force pull bar, open caisson pressure-bearing " bracket " is connected to mutually from surface drilling castinplace pile top.When counter-force pull bar is installed, rod member upper end should and open caisson wall 7 on the distance of reserved about 10cm between pressure-bearing " bracket ", enable open caisson starting there is certain degree of depth of drowning oneself when drawing brick fetal membrane.
(4) measurement result of the foundation open caisson discrepancy in elevation and inclination, adjusts the pressure size of the punching jack 1 of each point, slowly carries out correction operation to open caisson.
(5) first pressure fetches earth after sinking.Punching jack 1 starts slowly to apply pressure to open caisson, when top power cannot be sunk to predetermined value, starts to inhale 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 punching jack 1 pair of borehole wall 7 produce a downward pressure, impels well sinking.
(6) carrying out pressing in 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.When after caisson sinking oil cylinder stroke (about 20cm), jack cylinder is retracted, and upper end nut backspin is about 20cm, and so forth.
(7) the attaching nut's size between upper and lower pull bar is larger, the pull bar preformed hole of pressure-bearing " bracket " can not be passed, after the about 1.7m degree of depth of often sinking, a joint need be removed and replace pull bar (length 1.7m), the pull bar (length 3.7m) that worked on top is replaced pull bar with next section and is connected, start the heavy circulation of next pressure, until be sink to design elevation.In sinking construction process, the height of measurement should be splashed.
(8) pressure removes the heavy equipment of pressure after being sink to design elevation, carries out open caisson subsequent construction.
Above-mentioned open caisson pressure sinking construction method, also by carrying out slip casting to drilled pile pile body outside, significantly improving the adhesion strength of pile body pile body and the soil body, thus significantly improving the uplift resistance of stake; Take to press heavy well construction technique, open caisson possesses higher subsidence factor and regulates space, reaches anti-object of gushing, the pressure of the soil body inside and outside balance well by increasing suitable soil plug, thus prevents the outer soil body of open caisson and pour in phenomenon in well; Thixotropic slurry helps heavy method to be that one helps heavy drag reduction method preferably, plays a part reduce frictional force and safeguard soil wall stability by arranging peripheral mud sleeve.
Application implementation example of the present invention:
Shanghai ultra-large type pipe-jacking project three active wells, 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 make for three times, once sink, and are the forced sinking construction technique of domestic first Application open caisson.
Apply the open caisson efficient sinking construction method dynamic to environment micro-turbulence of the present invention, control open caisson attitude is easy and precision is very high, and the heavy discrepancy in elevation is less than 3/1000ths eventually; Subsidence velocity is fast, by pressure sinking device, increases the subsidence factor of open caisson, significantly improves well sinking speed, reach the fastest one day speed of three meters in actual applications; Little to outside soil disturbance, make the degree of depth of caisson cutting edge injection soil layer darker by counter force system, thus make open caisson inherence keep higher soil plug still to have enough subsidence factors simultaneously, in case, the important pipe settlement at distance open caisson 7m place is only 4mm.Application the present invention not only completes sinking construction task, and greatly improves efficiency of construction and quality, is later ultra-deep, complicated geological and the higher sinking well engineering of environmental protection requirement has opened up invaluable experience.
Claims (4)
1. a caisson sinking construction method dynamic to environment micro-turbulence, it 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 ensures that the position at the center of stake overlaps with punching jack center;
2) open caisson starts the preparation before sinking
Before open caisson starts sinking, device therefor and system are in place, and debug punching jack hydraulic system;
3) counter-force pull bar is installed
According to well sinking level configurations counter-force pull bar, open caisson pressure-bearing " bracket " is connected to mutually from surface drilling castinplace pile top, when counter-force pull bar is installed, counter-force pull bar upper end should and open caisson wall on the distance of reserved 10cm between pressure-bearing " bracket ", enable open caisson starting there is certain degree of depth of drowning oneself when drawing brick fetal membrane;
4) the pressure size of punching jack is adjusted
The measurement result of the foundation open caisson discrepancy in elevation and gradient, adjusts the pressure size of the punching jack of each point, slowly carries out correction operation to open caisson;
5) first pressure fetches earth after sinking
Punching jack starts slowly to apply pressure to open caisson, when pressure cannot sink to predetermined value, starts to inhale 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 " bracket " on the jack pair borehole wall produce a downward pressure, impels well sinking;
6) the heavy work progress of pressure
(1) carrying out pressing in heavy process, jack cylinder upwards withstands upper end anchoring nut, counter-force pull bar transmission of pressure is to bored pile, pressure-bearing " bracket " is subject to downward pressure simultaneously, impel well sinking, when after well sinking oil cylinder stroke, jack cylinder is retracted, by upper end nut backspin 20cm, and so forth;
(2) after the 1.7m degree of depth of often sinking, need remove a joint and replace counter-force pull bar, the counter-force that worked on top pull bar and next section are replaced counter-force pull bar and are connected, and start the heavy circulation of next pressure, until be sink to design elevation;
In sinking construction process, and splash the height of measurement;
7) pressure removes the heavy equipment of pressure after being sink to design elevation, carries out open caisson subsequent construction.
2. the caisson sinking construction method dynamic to environment micro-turbulence according to claim 1, it is characterized in that: above-mentioned open caisson pressure sinking construction method is also by carrying out slip casting to bored pile pile body outside, improve the adhesion strength of pile body and the soil body, thus significantly improve the uplift resistance of stake.
3. the caisson sinking construction method dynamic to environment micro-turbulence according to claim 1, it is characterized in that: in the heavy well construction method of above-mentioned pressure, possess higher subsidence factor to make open caisson and regulate space, anti-object of gushing is reached by increasing soil plug, the pressure of the soil body inside and outside balance well, prevents the soil body outside open caisson and pours in the phenomenon in well.
4. the caisson sinking construction method dynamic to environment micro-turbulence according to claim 1, it is characterized in that: in the heavy well construction method of above-mentioned pressure, adopting thixotropic slurry to help heavy method, playing a part reduce frictional force and safeguard soil wall stability by arranging peripheral mud sleeve.
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| JP6401006B2 (en) * | 2014-10-09 | 2018-10-03 | 英昭 山岸 | Jack system and method of sinking housing |
| 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 |
| CN105970985B (en) * | 2016-05-27 | 2020-12-04 | 广州中国科学院工业技术研究院 | Open caisson for silt water area mudflat and installation method thereof |
| CN106759417B (en) * | 2016-11-10 | 2018-11-30 | 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 |
| CN107620313B (en) * | 2017-11-15 | 2022-12-23 | 扬州市江都永坚有限公司 | Static pressure open caisson device |
| CN109235477B (en) * | 2018-10-26 | 2023-07-18 | 中铁工程装备集团有限公司 | Segment pressure increasing device and segment pressure increasing method suitable for open caisson construction method |
| CN111549885B (en) * | 2020-05-15 | 2021-04-30 | 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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