CN102304913A - LCSG (Long-Concrete Short-Gravel) pile and vacuum prepressing combined processing method and device for soft soil foundation - Google Patents
LCSG (Long-Concrete Short-Gravel) pile and vacuum prepressing combined processing method and device for soft soil foundation Download PDFInfo
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- CN102304913A CN102304913A CN201110184496A CN201110184496A CN102304913A CN 102304913 A CN102304913 A CN 102304913A CN 201110184496 A CN201110184496 A CN 201110184496A CN 201110184496 A CN201110184496 A CN 201110184496A CN 102304913 A CN102304913 A CN 102304913A
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Abstract
The invention discloses an LCSG (Long-Concrete Short-Gravel) pile and vacuum prepressing combined processing method and device for a soft soil foundation. The LCSG (Long-Concrete Short-Gravel) pile and vacuum prepressing combined processing device comprises an LCSG pile, a horizontal cushion layer and a vacuum pressurizing system, wherein the LCSG pile consists of a relatively long concrete pile core and a relative short gravel pipe sleeve which are cast into a whole, the length of the gravel pile sleeve is a half to two third of the length of the concrete pile core, the horizontal cushion layer comprises medium sand and coarse sand, the vacuum pressurizing system comprises a vacuum pump, a prepressing pipeline, a closed device and the like, no other vertical drainage pipelines or vacuum pressurizing pipelines are arranged in the system separately, and the functions of the other vertical drainage pipelines and vacuum pressurizing pipelines are fulfilled by the gravel sleeve of the LCSG pile. The LCSG pile and vacuum prepressing combined processing method and device have the functions of controlling total sedimentation, reducing lateral deformation, preventing foundation soil liquefying, eliminating foundation shear damage caused by rapid loading; equipment is simple, and the effects of reducing cost and shortening construction period reasonably.
Description
Technical field:
The invention belongs to the Soft Ground field, relate to the compound broken stone pile of the long core concrete of a kind of soft foundation (Long-Concrete Short-Gravel stake is hereinafter to be referred as " LCSG stake ") and vacuum pre-pressed joint processing method and device thereof.
Background technology:
At present, structure such as the increasing highrise building in coastal area, speedway, airport, harbour, factory building, warehouse, oil pipe are built on deep soft foundation.The upper load that this type structure bear is very big, and very responsive to sedimentation.Coastal soft foundation has usually that moisture content is big, void ratio is big, at the bottom of the intensity, consolidation rate waits characteristics slowly; What have then is easy to generate liquefaction under dynamic load function, the forfeiture supporting capacity.After top structure construction finished, soft foundation had one usually and lasted 3 to 5 years even vertical sedimentation and lateral deformation process for more time, and the use that this will have a strong impact on the top structure is necessary natural soft soil foundation is carried out consolidation process.
The large tracts of land reinforcing soft ground adopts preloading and vacuum method usually, and these two kinds of methods all can make foundation strength improve and fulfil certain settling amount ahead of schedule.Preloading is before structure are built use, and filling out the preloading material through interim heap increases soil body total stress, and then ground is applied precompressed; But it needs preloading materials such as a large amount of soil bodys, piece stone, and is causing foundation instability producing bigger lateral deformation near place, the face of land easily, in the applying of actual engineering, has received certain restriction.Vacuum method is through vacuumizing, and under the constant situation of soil body total stress, reduces pore water pressure, increases soil body effective stress, and inner external pressure difference produces the precompressed effect, and the pore water in the soil is discharged; But generally about 80kPa, the precompressed effect is less than normal for its precompression, and the duration is longer, can not satisfy the instructions for use of top structure.No matter be piling prepressing or vacuum preloading, they all are limited to the raising of soft foundation bearing capacity, can't satisfy the requirement of big load in top or special function of use under a lot of situation.
Summary of the invention:
For remedying the deficiency of traditional vacuum prepressing ground foundation treatment method; A first aspect of the present invention purpose provides a kind of soft foundation LCSG stake and vacuum pre-pressed joint treating apparatus; It is characterized in that: comprise the pile foundation layer of forming by some LCSG stakes; Described LCSG stake comprises the concrete pile core; And the rubble pile protection that is arranged at concrete pile core periphery; Horizontal bed course is arranged at the top of pile foundation layer, and the vacuum preloading system is arranged at the top of horizontal bed course.
Further:
Described LCSG stake, the length of concrete pile core is greater than the length of rubble pile protection.
The diameter of concrete pile core is that 0.4m, length are 20.0m, and the diameter of rubble pile protection is that 0.5m, length are 12m, and the spacing between the LCSG stake is 2.5m.
The diameter of concrete pile core is that 0.6m, length are 30.0m, and the diameter of rubble pile protection is that 0.8m, length are 20m, and the spacing of LCSG stake is 3.0m.
Described horizontal bed course adopts medium sand or coarse sand, and horizontal cushion thickness is 0.3～0.5m, in whole ground scope, lays.
The vacuum preloading system comprises vacuum preloading pipeline and obturator, vacuum pump, and vacuum preloading pipeline and obturator are layed in the top of horizontal bed course, and vacuum pump links to each other with the vacuum preloading pipeline.
Described vacuum preloading pipeline adopts outsourcing 90g/m
2The chimney filter of non-woven geotextile, described obturator adopts factory's heat seal one-shot forming caulking gum film or PVC diaphragm seal.
Described vacuum pump adopts jet vacuum pump, and every jet vacuum pump control area is 800m
2, vacuum reached more than 80 kPa in lasting 10 days under diaphragm seal.
The present invention provides a kind of soft foundation LCSG stake and vacuum pre-pressed joint processing method on the other hand, may further comprise the steps:
1, lays horizontal mattress layer on the soft foundation surface;
2, laying on the soft foundation of horizontal mattress layer, adopting rubble and the concrete of immersed tunnelling method at same position injection successively different depth, forming rubble pile protection and concrete pile core, the rubble pile protection is centered around the upper outside of concrete pile core, forms the LCSG stake; After the LCSG stake sets completion successively, supply the horizontal bed course on the face of land by stake;
3, on horizontal bed course, lay vacuum preloading pipeline and obturator, and carry out the vacuum preloading loading, after precompressed loads and accomplishes, accomplish ground treatment construction and do through vacuum pump.
Further:
In the step 2: describedly set the LCSG stake, set broken stone pile to its design elevation through immersed tunnelling method earlier; Set the concrete pile core in position to its design elevation through immersed tunnelling method again, the rubble pile body that sets earlier is extruded into becomes the annular pile protection around being looped around concrete pile core top simultaneously, form the LCSG stake.
Beneficial effect of the present invention is: LCSG pile body of the present invention has the distortion of carrying, limit lateral, vertical reinforcement, prevent the effect of liquefying; Simultaneously foundation soil there is compacted effect; The vertical pressurization passageway of its rubble pile protection double as vacuum preloading has reduced the vertical drainage body construction sequence of traditional vacuum precompressed; Horizontal bed course mainly has top layer vacuum pressure and the effect of adjustment stake with the inter-pile soil stress distribution of transmitting; Vacuum preloading mainly has preconsolidation, acceleration draining, reduces the effect of settlement after construction.The present invention has the control total settlement, reduces lateral deformation, prevents to liquefy, eliminate the effects such as ground shear failure that quick loading causes; Equipment is simple, reduce cost and can reasonably shorten the construction period.
Description of drawings:
Fig. 1 is the sketch map of soft foundation LCSG of the present invention stake and vacuum pre-pressed joint treating apparatus.
Among the figure: the 1st, the concrete pile core; The 2nd, the rubble pile protection; 1 and 2 common formation LCSG stakes; The 3rd, horizontal bed course; The 4th, vacuum preloading pipeline and obturator; The 5th, vacuum pump.
The specific embodiment:
Embodiment 1:
As shown in Figure 1, Fig. 1 is a kind of soft foundation LCSG stake and the piling prepressing united processing side device of present embodiment, and described combined apparatus comprises:
The pile foundation layer; The pile foundation layer comprises some LCSG stakes; Every LCSG stake comprises the concrete pile core 1 that is formed by cylindrical concrete spouting; The rubble pile protection 2 that is cast in concrete pile core 1; Concrete pile core 1 is formed the LCSG stake with rubble pile protection 2, and the length of concrete pile core 1 is greater than the length of rubble pile protection 2; The diameter of the concrete pile core 1 of LCSG stake in the present embodiment is that 0.4m, length are 20.0m, and the diameter of rubble pile protection 2 is that 0.5m, length are 12m, and the spacing between the LCSG stake is 2.5m.
Horizontal bed course 3; Horizontal bed course 3 adopts coarse sand, and thickness is 0.3m, in whole ground scope, lays;
The vacuum preloading system comprises precompressed pipeline and obturator 4, vacuum pump 5; Vacuum preloading pipeline and obturator 4 adopt outsourcing 90g/m respectively
2The chimney filter of non-woven geotextile and at factory's heat seal one-shot forming caulking gum film; Vacuum pump 5 adopts jet vacuum pump, and every control area is 800m
2, vacuum reached more than 80 kPa in lasting 10 days under diaphragm seal.
The soft foundation LCSG stake of present embodiment and vacuum pre-pressed joint processing method comprise the steps:
1, lays horizontal bed course 3 on the soft foundation surface;
2, set broken stone pile to its design elevation through immersed tunnelling method;
3, through immersed tunnelling method in position (step 2 piling place) set concrete pile core 1 to its design elevation, simultaneously the rubble pile body that step 2 is set is extruded into the annular pile protection 2 that is looped around around concrete pile core 1 top, forms LCSG stake (1+2);
4, different places set the LCSG stake successively according to design attitude in the place;
5, on the ground of accomplishing fluently the LCSG stake, lay vacuum preloading pipeline and obturator 4;
6, carry out vacuum preloading through vacuum pump 5 and load, prepressing water discharge is accomplished ground treatment construction and is done to designing requirement.
This processing method has the control total settlement, reduces lateral deformation, prevents to liquefy, eliminate the effects such as ground shear failure that quick loading causes; Equipment is simple, reduce cost, and can will shorten about 1/3 the duration.
Embodiment 2:
A kind of soft foundation LCSG stake of present embodiment and piling prepressing united treating apparatus and method are with embodiment 1; Difference is: the diameter of the concrete pile core 1 of LCSG stake in the present embodiment is that 0.6m, length are 30.0m; The diameter of rubble pile protection 2 is that 0.8m, length are 20m, and the spacing of LCSG stake is 3.0m; Horizontal bed course 3 adopts medium sand, and horizontal cushion thickness 0.5m lays in whole ground scope; Vacuum preloading pipeline and the airtight facility precompressed 4 employing outsourcing 90g/m of system thereof
2The chimney filter of non-woven geotextile and PVC diaphragm seal; Vacuum pump 5 adopts jet vacuum pump, and every control area is made as 800m
2Require under the diaphragm seal vacuum to continue to reach more than 80 kPa in 10 days simultaneously.
This processing method has the control total settlement, reduces lateral deformation, prevents to liquefy, eliminate the effects such as ground shear failure that quick loading causes; Equipment is simple, reduce cost, and can will shorten about 1/3 the duration.
Claims (10)
1. soft foundation LCSG stake and vacuum pre-pressed joint treating apparatus; It is characterized in that: comprise the pile foundation layer of forming by some LCSG stakes; Described LCSG stake comprises the concrete pile core; And the rubble pile protection that is arranged at concrete pile core periphery; Horizontal bed course is arranged at the top of pile foundation layer, and the vacuum preloading system is arranged at the top of horizontal bed course.
2. a kind of soft foundation LCSG according to claim 1 stake and vacuum pre-pressed joint treating apparatus is characterized in that: described LCSG stake, the length of concrete pile core is greater than the length of rubble pile protection.
3. a kind of soft foundation LCSG according to claim 1 stake and vacuum pre-pressed joint treating apparatus; It is characterized in that: described LCSG stake; The diameter of concrete pile core is that 0.4m, length are 20.0m, and the diameter of rubble pile protection is that 0.5m, length are 12m, and the spacing between the LCSG stake is 2.5m.
4. a kind of soft foundation LCSG according to claim 1 stake and vacuum pre-pressed joint treating apparatus; It is characterized in that: described LCSG stake; The diameter of concrete pile core is that 0.6m, length are 30.0m, and the diameter of rubble pile protection is that 0.8m, length are 20m, and the spacing of LCSG stake is 3.0m.
5. a kind of soft foundation LCSG according to claim 1 stake and vacuum pre-pressed joint treating apparatus is characterized in that: described horizontal bed course adopts medium sand or coarse sand, and horizontal cushion thickness is 0.3～0.5m.
6. a kind of soft foundation LCSG according to claim 1 stake and vacuum pre-pressed joint treating apparatus; It is characterized in that: described vacuum preloading system comprises vacuum preloading pipeline and obturator, vacuum pump; Vacuum preloading pipeline and obturator are layed in the top of horizontal bed course, and vacuum pump links to each other with the vacuum preloading pipeline.
7. a kind of soft foundation LCSG according to claim 6 stake and vacuum pre-pressed joint treating apparatus is characterized in that: described vacuum preloading pipeline adopts outsourcing 90g/m
2The chimney filter of non-woven geotextile, described obturator adopts rubber sealing film or PVC diaphragm seal.
8. a kind of soft foundation LCSG according to claim 6 stake and vacuum pre-pressed joint treating apparatus is characterized in that: described vacuum pump adopts jet vacuum pump, and every jet vacuum pump control area is 800m
2, vacuum reached more than 80 kPa in lasting 10 days under diaphragm seal.
9. soft foundation LCSG stake and vacuum pre-pressed joint processing method may further comprise the steps:
(1), lays horizontal mattress layer on the soft foundation surface;
(2), laying on the soft foundation of horizontal mattress layer; Adopt rubble and the concrete of immersed tunnelling method at same position injection successively different depth; Form rubble pile protection and concrete pile core, the rubble pile protection is centered around the upper outside of concrete pile core, forms the LCSG stake; After the LCSG stake sets completion successively, supply the horizontal bed course on the face of land by stake;
(3), on horizontal bed course, lay vacuum preloading pipeline and obturator, and carry out vacuum preloading through vacuum pump and load, after precompressed loads and accomplishes, accomplish ground treatment construction and do.
10. a kind of soft foundation LCSG according to claim 9 stake and vacuum pre-pressed joint processing method is characterized in that: in the step 2, set the LCSG stake, set broken stone pile to its design elevation through immersed tunnelling method earlier; Set the concrete pile core in position to its design elevation through immersed tunnelling method again, the rubble pile body that sets earlier is extruded into becomes the annular pile protection around being looped around concrete pile core top simultaneously, form the LCSG stake.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110184496A CN102304913A (en) | 2011-07-04 | 2011-07-04 | LCSG (Long-Concrete Short-Gravel) pile and vacuum prepressing combined processing method and device for soft soil foundation |
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| CN201110184496A CN102304913A (en) | 2011-07-04 | 2011-07-04 | LCSG (Long-Concrete Short-Gravel) pile and vacuum prepressing combined processing method and device for soft soil foundation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350513A (en) * | 2015-12-04 | 2016-02-24 | 中铁第四勘察设计院集团有限公司 | Novel construction method for end-bearing type composite consolidated foundation |
| CN105507227A (en) * | 2015-12-04 | 2016-04-20 | 中铁第四勘察设计院集团有限公司 | Novel construction method of large-diameter composite structure pile consolidated foundation |
| CN110485405A (en) * | 2019-08-26 | 2019-11-22 | 中建五局第三建设有限公司 | A kind of hardened system and reinforcement means of soft soil foundation |
| CN112442975A (en) * | 2020-11-24 | 2021-03-05 | 江苏科技大学 | Soft mud drainage concreties processing system based on retractable PVC drainage stake |
Citations (3)
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| JP2002054131A (en) * | 2000-08-11 | 2002-02-20 | Hazama Gumi Ltd | Soil improving structure and soil improving method capable of controlling peripheral ground displacement |
| CN1632236A (en) * | 2003-12-22 | 2005-06-29 | 邓亚光 | Stiffening core composite pile and construction method thereof |
| CN202148522U (en) * | 2011-07-04 | 2012-02-22 | 绍兴文理学院 | Soft soil foundation long concrete short gravel (LCSG) pile and vacuum preloading joint treatment device |
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2011
- 2011-07-04 CN CN201110184496A patent/CN102304913A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002054131A (en) * | 2000-08-11 | 2002-02-20 | Hazama Gumi Ltd | Soil improving structure and soil improving method capable of controlling peripheral ground displacement |
| CN1632236A (en) * | 2003-12-22 | 2005-06-29 | 邓亚光 | Stiffening core composite pile and construction method thereof |
| CN202148522U (en) * | 2011-07-04 | 2012-02-22 | 绍兴文理学院 | Soft soil foundation long concrete short gravel (LCSG) pile and vacuum preloading joint treatment device |
Non-Patent Citations (2)
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| 《工程排水与加固技术理论与实践--第七届全国工程排水与加固技术研讨会论文集》 20081231 陈志宁等人 某大型停车场软基处理方案分析及优化 , * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350513A (en) * | 2015-12-04 | 2016-02-24 | 中铁第四勘察设计院集团有限公司 | Novel construction method for end-bearing type composite consolidated foundation |
| CN105507227A (en) * | 2015-12-04 | 2016-04-20 | 中铁第四勘察设计院集团有限公司 | Novel construction method of large-diameter composite structure pile consolidated foundation |
| CN110485405A (en) * | 2019-08-26 | 2019-11-22 | 中建五局第三建设有限公司 | A kind of hardened system and reinforcement means of soft soil foundation |
| CN112442975A (en) * | 2020-11-24 | 2021-03-05 | 江苏科技大学 | Soft mud drainage concreties processing system based on retractable PVC drainage stake |
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Application publication date: 20120104 |