CN102535431B - Method for quickly forming blown and filled ultra-soft soil foundation surface layer duricrust and device for realizing method - Google Patents
Method for quickly forming blown and filled ultra-soft soil foundation surface layer duricrust and device for realizing method Download PDFInfo
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- CN102535431B CN102535431B CN201210066843.2A CN201210066843A CN102535431B CN 102535431 B CN102535431 B CN 102535431B CN 201210066843 A CN201210066843 A CN 201210066843A CN 102535431 B CN102535431 B CN 102535431B
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- exhaust pipe
- switching device
- hydraulic reclamation
- band drain
- soft ground
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Abstract
The invention discloses a method for quickly forming a blown and filled ultra-soft soil foundation surface layer duricrust. The method comprises the following steps of: cutting a drain board; mounting a switching device; inserting the drain board into a mud layer; connecting the switching device to an air suction pipeline; mounting a vacuumizing device, and sucking air; when the cracking vacuum degree of the earth surface is lower than a set value, stopping sucking the air, and naturally drying in the air; measuring the maximum cracking depth, and laying and filling mud to fill cracks; sucking the air again until the bearing capacity of the duricrust meets requirements; and performing deep reinforcement by the conventional reinforcement measure. The device for realizing the method comprises the air suction pipeline, the vacuumizing device connected with the air suction pipeline, and a plurality of fishbone-shaped joint units which are arranged on the air suction pipeline at intervals, wherein each fishbone-shaped joint unit comprises a joint main body and a plurality of branch pipes. By the method and the device, the foundation can be directly reinforced without airing after being blown and filled, so that construction periods are saved, and silty-fine sand is not needed.
Description
Technical field
The present invention relates to the field of reclaiming fields from the sea, particularly relate to the device that a kind of hydraulic reclamation super soft ground top layer duricrust forms fast method and realizes the method.
Background technology
Along with the development of China coast urban construction, the scale of reclaiming fields from the sea constantly expands.Due to shorter and shorter to the final construction period on ground of handing over from starting hydraulic reclamation, barged-in fill generally has little time airing and will reinforce.In existing construction, often adopt vacuum preloading second consolidation technology, first hydraulic reclamation ultra-soft soil is carried out to shallow layer reinforcement, formation can above deep layer re-pack after mechanical crust layer, then carries out deep-layer reinforcing.
It is 30 days that vacuum preloading shallow layer reinforcement is processed the general formal cycle of bleeding, reinforcing program for laying geotextiles on ultra-soft soil face, manually set band drain, then band drain is connected with chimney filter, and lay successively geo-grid, geotextiles and two-layer diaphragm seal, the loading of bleeding subsequently, unloading afterwards in 30 days; When formally bleeding, the powder fine sand that hydraulic reclamation 80～100cm is thick on shallow layer reinforcement diaphragm seal, carries out deep-layer reinforcing.Because powder fine sand resource is well sold and in short supply, construction costs is constantly raised, and because taboo is adopted the enforcement of policy, powder fine sand is arrival in time often, reinforce duration and quality and all can not be guaranteed, be therefore badly in need of a kind of quick formation technology of new super soft ground top layer duricrust.
Summary of the invention
The object of the present invention is to provide and a kind ofly after ultra-soft soil hydraulic reclamation completes, without airing, just can directly reinforce, and the device that does not need to use the hydraulic reclamation super soft ground top layer duricrust of powder fine sand to form fast method and realize the method.
To achieve these goals, technical scheme of the present invention is as follows:
Hydraulic reclamation super soft ground top layer duricrust forms a method fast, comprises the following steps:
1) according to the reinforcement depth cutting band drain of hydraulic reclamation super soft ground;
2) on the band drain after cutting, switching device is installed;
3) band drain after cutting is inserted in hydraulic reclamation super soft ground mud layer together with switching device, and keep more than switching device upper end exposes mud face;
4) switching device upper end is connected with an exhaust pipe, this exhaust pipe is connected with vacuum extractor;
5) start described vacuum extractor and bleed, bleed after a period of time, when earth surface cracks, low vacuum are when setting value, stop bleeding, allow earth's surface under natural air drying effect, continue cracking;
6) measure the maximum crack penetration of hydraulic reclamation ultra-soft soil, and on earth's surface, spread the slurry filling cracks that fillers, paving is filled out thickness and is greater than maximum crack penetration;
7) restart to bleed, until the supporting capacity of foundation surface crust layer reaches the standard that requires of work plane;
8) adopt conventional reinforcement measure on described crust layer, to carry out deep-layer reinforcing.
Preferably, in step 1, the reinforcement depth of the length of band drain and hydraulic reclamation super soft ground is suitable, makes band drain when inserting hydraulic reclamation ultra-soft soil layer, can run through hydraulic reclamation ultra-soft soil layer, fully contacts to expand as far as possible bleed and draining scope with ultra-soft soil layer.
Conventionally, band drain insertion depth is 3～5m, and switching device enters 30cm left and right under mud.In addition, in step 7, the thickness that spreads the slurry that fillers when filling cracks is greater than maximum crack penetration, and to guarantee the lex primaria of ground, general paving is filled out thickness in 40～60cm left and right; Vacuum setting value in step 5 is generally 60kPa.
A kind of device that forms fast method for realizing above-mentioned hydraulic reclamation super soft ground top layer duricrust, comprise exhaust pipe and the vacuum extractor that is connected this exhaust pipe, this device also comprises a plurality of herringbone connector units that are disposed on described exhaust pipe, described in each, herringbone connector unit comprises an adapter body and a plurality of arm, the two ends of described adapter body are communicated with described exhaust pipe, and described in each, one end of arm is communicated with described adapter body, the other end connects a band drain by a switching device.
Band drain is connected with exhaust pipe by switching device and the arm that is connected with switching device.When vacuum extractor is bled, water in ground is under the effect of negative pressure, successively via entering exhaust pipe after band drain, switching device, herringbone joint, and discharge under the effect of follow-up dewatering installation, thereby reach the water content reducing in ground, the object of solidifying ground.
Vacuum means in the said equipment is set to jet pump, and the layout density of jet pump is determined as required, is generally 800～1200m
2/ platform.
Adopt hydraulic reclamation super soft ground of the present invention top layer duricrust to form fast method and apparatus, after ground hydraulic reclamation completes, without airing, just can directly reinforce, saved the duration.In addition, in the process forming at ground top layer duricrust, do not need to use powder fine sand, thereby saved a large amount of natural resources, meet the social theory of environmental protection and energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 forms the schematic diagram of the equipment of method fast for realizing hydraulic reclamation super soft ground of the present invention top layer duricrust;
Fig. 2 forms the half sectional view of the equipment herringbone joint of method fast for realizing hydraulic reclamation super soft ground of the present invention top layer duricrust;
Fig. 3 forms the pipeline connection diagram of the equipment of method fast for realizing hydraulic reclamation super soft ground of the present invention top layer duricrust.
The specific embodiment
Below in conjunction with accompanying drawing and Specific construction example, the present invention is described in further detail.
As shown in Fig. 1 to 3, the device forming fast for hydraulic reclamation super soft ground top layer duricrust of the present invention comprises: exhaust pipe 3, vacuum extractor 5 and be disposed on a plurality of herringbone connector units 4 on exhaust pipe 3.
Herringbone connector unit 4 comprises adapter body 6 and a plurality of arm 7, the two ends of adapter body 6 are connected in exhaust pipe 3, a plurality of arms 7 radially distribute, one end jointing main body 6 of each arm 7, and the other end is connected with a band drain 1 by a switching device 2.Vacuum extractor 5 adopts jet pump, and the layout density of jet pump is determined as required, is generally 800～1200m
2/ platform.
Band drain 1 is connected with exhaust pipe 3 through switching device 2 and arm 7.When jet pump is bled, the water in ground, under the effect of negative pressure, enters exhaust pipe 3 and discharges via band drain 1, switching device 2, herringbone joint 4 successively, thereby reaches the water content reducing in ground, the object of solidifying ground.
Below in conjunction with concrete construction embodiment, to form fast the method for hydraulic reclamation super soft ground top layer duricrust with said apparatus, describe.
The first construction embodiment
1) cutting band drain 1, and the length cutting of each band drain 1 is 3m;
2) PE plastic flexible pipe is installed as switching device 2 on the band drain after cutting 1;
3) band drain after cutting 1 is inserted in hydraulic reclamation super soft ground mud layer to band drain and runs through hydraulic reclamation ultra-soft soil layer together with switching device 2, now, switching device 2 lower ends are positioned at 30cm under mud, more than mud face is exposed in upper end;
4) switching device 2 upper ends are connected on exhaust pipe 3 to communicated drainage plate 1 and exhaust pipe 3;
5) on exhaust pipe 3, lay jet pump as vacuum extractor 5, layout density is 1000m
2/ platform;
6) start vacuum extractor and bleed, bleed after 10 days, earth surface cracks, low vacuum, in 60kPa, stop bleeding, and allow earth's surface under natural air drying effect, continue cracking, continue 8 days;
7) through measuring, the maximum crack penetration of hydraulic reclamation ultra-soft soil is 30cm, spreads the slurry filling cracks that fillers on earth's surface, and paving is filled out thickness 50cm;
8) restart to bleed 30 days, until the supporting capacity of foundation surface crust layer reaches 30kPa;
9) on crust layer, adopt vacuum preloading mode to carry out deep-layer reinforcing.
The second construction embodiment
1) cutting band drain 1, and the length cutting of each band drain 1 is 5m;
2) PVC plastic flexible pipe is installed as switching device 2 on the band drain after cutting 1;
3) band drain after cutting 1 is inserted in hydraulic reclamation super soft ground mud layer to band drain and runs through hydraulic reclamation ultra-soft soil layer together with switching device 2, now, switching device 2 lower ends are positioned at 30cm under mud, more than mud face is exposed in upper end;
4) switching device 2 upper ends are connected on exhaust pipe 3 to communicated drainage plate 1 and exhaust pipe 3;
5) on exhaust pipe 3, lay jet pump as vacuum extractor 5, layout density is 1200m
2/ platform;
6) start vacuum extractor and bleed, bleed after 11 days, earth surface cracks, low vacuum, in 60kPa, stop bleeding, and allow earth's surface under natural air drying effect, continue cracking, continue 10 days;
7) through measuring, the maximum crack penetration of hydraulic reclamation ultra-soft soil is 40cm, spreads the slurry filling cracks that fillers on earth's surface, and paving is filled out thickness 60cm;
8) restart to bleed 40 days, until the supporting capacity of foundation surface crust layer reaches 30kPa;
9) on crust layer, adopt vacuum preloading mode to carry out deep-layer reinforcing.
The 3rd construction embodiment
1) cutting band drain 1, and the length cutting of each band drain 1 is 4m;
2) PE plastic flexible pipe is installed as switching device 2 on the band drain after cutting 1;
3) band drain after cutting 1 is inserted in hydraulic reclamation super soft ground mud layer to band drain and runs through hydraulic reclamation ultra-soft soil layer together with switching device 2, now, switching device 2 lower ends are positioned at 30cm under mud, more than mud face is exposed in upper end;
4) switching device 2 upper ends are connected on exhaust pipe 3 to communicated drainage plate 1 and exhaust pipe 3;
5) on exhaust pipe 3, lay jet pump as vacuum extractor 5, layout density is 800m
2/ platform;
6) start vacuum extractor and bleed, bleed after 9 days, earth surface cracks, low vacuum, in 60kPa, stop bleeding, and allow earth's surface under natural air drying effect, continue cracking, continue 5 days;
7) through measuring, the maximum crack penetration of hydraulic reclamation ultra-soft soil is 28cm, spreads the slurry filling cracks that fillers on earth's surface, and paving is filled out thickness 45cm;
8) restart to bleed 25 days, until the supporting capacity of foundation surface crust layer reaches 30kPa;
9) on crust layer, adopt vacuum preloading mode to carry out deep-layer reinforcing.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvement, and these improvement are also included within protection scope of the present invention.
Claims (5)
1. hydraulic reclamation super soft ground top layer duricrust forms a method fast, it is characterized in that comprising the following steps:
1) according to the reinforcement depth cutting band drain (1) of hydraulic reclamation super soft ground;
2) the upper switching device (2) of installing of the band drain after cutting (1);
3) band drain after cutting (1) is inserted in hydraulic reclamation super soft ground mud layer together with switching device (2), and keep more than switching device (2) upper end exposes mud face;
4) switching device (2) upper end is connected with an exhaust pipe (3), this exhaust pipe (3) is connected with vacuum extractor (5), on described exhaust pipe (3), be arranged at intervals with a plurality of herringbone connector units (4), described in each, herringbone connector unit (4) comprises that the two ends of an adapter body (6) and the described adapter body of a plurality of arm (7) (6) are communicated with described exhaust pipe (3), and one end of arm described in each (7) is communicated with described adapter body (6), the other end connects a band drain (1) by a switching device (2);
5) start described vacuum extractor (5) and bleed, bleed after a period of time, when earth surface cracks, low vacuum are when setting value, stop bleeding, allow earth's surface under natural air drying effect, continue cracking;
6) measure the maximum crack penetration of hydraulic reclamation ultra-soft soil, and on earth's surface, spread the slurry filling cracks that fillers, paving is filled out thickness and is greater than maximum crack penetration;
7) restart to bleed, until the supporting capacity of foundation surface crust layer reaches the standard that requires of work plane;
8) adopt conventional reinforcement measure on described crust layer, to carry out deep-layer reinforcing.
2. hydraulic reclamation super soft ground according to claim 1 top layer duricrust forms method fast, it is characterized in that: the length of band drain described in step 1 (1) is suitable with the reinforcement depth of hydraulic reclamation super soft ground.
3. hydraulic reclamation super soft ground according to claim 1 top layer duricrust forms method fast, it is characterized in that: the setting value of vacuum described in step 5 is 60kPa.
4. a device that forms fast method for realizing hydraulic reclamation super soft ground top layer duricrust described in claim 1, comprise exhaust pipe (3) and the vacuum extractor (5) that is connected this exhaust pipe (3), it is characterized in that: this device also comprises a plurality of herringbone connector units (4) that are disposed on described exhaust pipe (3), described in each, herringbone connector unit (4) comprises an adapter body (6) and a plurality of arm (7), the two ends of described adapter body (6) are communicated with described exhaust pipe (3), one end of arm described in each (7) is communicated with described adapter body (6), the other end connects a band drain (1) by a switching device (2).
5. device according to claim 4, is characterized in that: described vacuum extractor (5) is jet pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210066843.2A CN102535431B (en) | 2012-03-14 | 2012-03-14 | Method for quickly forming blown and filled ultra-soft soil foundation surface layer duricrust and device for realizing method |
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|---|---|---|---|
| CN201210066843.2A CN102535431B (en) | 2012-03-14 | 2012-03-14 | Method for quickly forming blown and filled ultra-soft soil foundation surface layer duricrust and device for realizing method |
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| CN102535431A CN102535431A (en) | 2012-07-04 |
| CN102535431B true CN102535431B (en) | 2014-09-17 |
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| CN107724374B (en) * | 2017-04-29 | 2019-12-06 | 连云港力源泵业有限公司 | composite soft foundation reinforcement treatment construction method and combined drainage device |
| CN107447742A (en) * | 2017-07-11 | 2017-12-08 | 江苏坤泽科技股份有限公司 | A kind of muddy soft soil solidification basic unit external force fracture restoration method |
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| CN2729488Y (en) * | 2004-09-03 | 2005-09-28 | 胡冬宜 | Multi-joint for dense pipe line |
| CN101144274A (en) * | 2007-10-18 | 2008-03-19 | 上海交通大学 | Method for carrying vacuum prepressing consolidation by using plastic draining plate with box |
| CN101148871A (en) * | 2007-10-18 | 2008-03-26 | 上海交通大学 | Method for increasing thin-sand-layer-filling soft clay foundation vacuum degree |
| CN101225658A (en) * | 2008-02-18 | 2008-07-23 | 张志铁 | Soft soil foundation consolidation method |
| KR101085212B1 (en) * | 2008-11-26 | 2011-11-21 | (주)지구환경전문가그룹 | Construction method using suction sand bag |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215832B (en) * | 2007-12-29 | 2010-06-09 | 中交水运规划设计院有限公司 | Directly discharging type vacuum prepressing ground foundation treatment method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2729488Y (en) * | 2004-09-03 | 2005-09-28 | 胡冬宜 | Multi-joint for dense pipe line |
| CN101144274A (en) * | 2007-10-18 | 2008-03-19 | 上海交通大学 | Method for carrying vacuum prepressing consolidation by using plastic draining plate with box |
| CN101148871A (en) * | 2007-10-18 | 2008-03-26 | 上海交通大学 | Method for increasing thin-sand-layer-filling soft clay foundation vacuum degree |
| CN101225658A (en) * | 2008-02-18 | 2008-07-23 | 张志铁 | Soft soil foundation consolidation method |
| KR101085212B1 (en) * | 2008-11-26 | 2011-11-21 | (주)지구환경전문가그룹 | Construction method using suction sand bag |
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