CN102704458A - Sand-free cushion layer vacuum-surcharge preloading reinforcement device and method for soft ground - Google Patents
Sand-free cushion layer vacuum-surcharge preloading reinforcement device and method for soft ground Download PDFInfo
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- CN102704458A CN102704458A CN2012102155686A CN201210215568A CN102704458A CN 102704458 A CN102704458 A CN 102704458A CN 2012102155686 A CN2012102155686 A CN 2012102155686A CN 201210215568 A CN201210215568 A CN 201210215568A CN 102704458 A CN102704458 A CN 102704458A
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Abstract
The invention discloses a sand-free cushion layer vacuum-surcharge preloading reinforcement device and method for soft ground. The device comprises plastic water draining boards, permeable flexible pipes, a first layer of non-woven geotextile, a second layer of non-woven geotextile, a third layer of non-woven geotextile, sealing membranes and a vacuum-pumping device; the plastic water draining boards are uniformly distributed and vertically inserted into the soft ground; the first layer of non-woven geotextile is laid on the ground surface of a region to be reinforced; the permeable flexible pipes are flatly laid on the first layer of non-woven geotextile, the peripheries of the permeable flexible pipes are covered by medium sand, and simultaneously the permeable flexible pipes are connected with the vacuum-pumping device after being connected with the plastic water draining boards; the second layer of non-woven geotextile, the sealing membranes and the third layer of non-woven geotextile are laid on the permeable flexible pipes at a time; and earth filling surcharge loading is carried out on the third layer of non-woven geotextile. The device has the advantages of reinforcing the soft ground in a vacuum -surcharge preloading manner, being capable of shortening the construction period, saving sand resources, having good preloading effect and being simple to operate, convenient and practical.
Description
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Technical field
The present invention relates to a kind of large tracts of land flexible foundation treatment method, is a kind of no sand vacuum preloading joint preloading method, belongs to the innovative technology of large tracts of land flexible foundation treatment method.
Background technology
Along with the quickening of present China modernization, in the process that coastal cities are built, there is a large amount of soft foundations to need to handle.Wherein vacuum-preloading joint preloading method is one of processing method of using always, and it is development on vacuum method and preloading basis.
Vacuum method uses the atmosphere precompressed as load; Lay one deck sand mat of subgrade on the ground now; Use sheeting machine to plug plastic draining board then, cover one deck to two-layer gas tight seal film more above that, use vacuum pump to make seepy material keep higher vacuum then by design pitch; In the pore water of soil, produce negative pore water pressure, thereby pore water is reached the precompressed effect by sucking-off gradually.
Preloading is filled out certain thickness fill stratum through ground on the scene heap and is used as prefabricating load, reached and reinforced the purpose of covering the weak soil layer down, but its volume of earthwork is big and the processing time is long.
Vacuum-preloading joint preloading method is utilized the advantage of vacuum preloading and preloading; When vacuum under the film of vacuum precompressed meets design requirement and can stablize maintenance; Embankment preloading on diaphragm seal; The head difference of utilizing preloading to produce is discharged Tu Zhongkongxishui, and then reaches the purpose of joint reinforcement.This method is fit to handle the soft foundation that is distributed with deep mud and silt soil strata, can reinforce this type ground quickly and efficiently.
But traditional vacuum-preloading joint preloading method needs sand cushion, generally needs to adopt mud content less than 5% medium coarse sand, and laying depth is about 50cm.
Summary of the invention
Goal of the invention: to the problem and shortage of above-mentioned existing existence, the purpose of this invention is to provide a kind of subgrade does not have sand cushion vacuum-preloading joint preloading bracing means and method, thereby can omit sand cushion, improves speed of application, reduces construction cost.
Technical scheme: for realizing the foregoing invention purpose; The present invention adopts following technical scheme: a kind of subgrade does not have sand cushion vacuum-preloading joint preloading bracing means; Comprise plastic draining board, Water penetrative flexible pipe, first floor non-woven geotextile, second layer non-woven geotextile, the 3rd layer of non-woven geotextile, diaphragm seal and vacuum extractor; Said plastic draining board evenly distributes and vertically inserts subgrade; Said first floor non-woven geotextile is laid on to be treated on the stabilization zone face of land, and said Water penetrative flexible pipe is tiled on the first floor non-woven geotextile and around Water penetrative flexible pipe, covers medium sand, is connected with vacuum extractor more simultaneously with after said plastic draining board is connected; Said second layer non-woven geotextile, diaphragm seal and the 3rd layer of non-woven geotextile once-paving are on Water penetrative flexible pipe, and the preloading of on the 3rd layer of non-woven geotextile, banketing.
Principle of the present invention is: in conventional vacuum preloading engineering; The main effect of sand cushion is: 1) transmit the low pressure in the pumped vacuum systems; Under film, form the low pressure field of force, it is 80-85kPa that its fluid absolute pressure is about the just usually said vacuum of 26-31kPa.2) water in the ground that sucks out, gas are compiled and go out the place by row of conduits.In view of these two kinds of functions, constitute no sand cushion with Water penetrative flexible pipe and non-woven geotextile, have same function with sand cushion.Therefore not having sand cushion also must possess certain water permeability, and satisfies and discharge the discharge requirement that suction comes up.
As improvement, in placing into the soil in said diaphragm seal edge.
Another purpose of the present invention provides a kind of reinforcement means that utilizes above-mentioned subgrade not have sand cushion vacuum-charge preloading consolidation device; It may further comprise the steps: after (1) earlier is in place plastic draining board, Water penetrative flexible pipe, first floor non-woven geotextile, second layer non-woven geotextile, diaphragm seal and vacuum extractor, start vacuum extractor up to vacustat under the diaphragm seal more than 80kPa; (2) continue then to lay the 3rd layer of non-woven geotextile, and the preloading of banketing above that, carry out joint preloading; (3) reach and unload vacuum and require back removal vacuum load, construction finishes.
Beneficial effect: compared with prior art, the present invention has the following advantages: except that the medium coarse sand that covers on a small quantity on the Water penetrative flexible pipe, need not use sand cushion; And replace with Water penetrative flexible pipe and non-woven geotextile; Therefore can shorten the construction period, practice thrift the sand resource, and precompressed be effective; And it is simple, convenient and practical.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the syndeton sketch map of Water penetrative flexible pipe according to the invention and plastic draining board;
Fig. 3 is the colligation mode sketch map of Water penetrative flexible pipe according to the invention and plastic draining board;
Fig. 4 covers the sand structural representation for Water penetrative flexible pipe according to the invention;
Fig. 5 is the structural representation of the said drainage system of the embodiment of the invention.
Wherein, Water penetrative flexible pipe 1, plastic draining board 2, vacuum pump 3, first floor non-woven geotextile 4, second layer non-woven geotextile 5, the 3rd layer of non-woven geotextile 6, diaphragm seal 7, medium sand 8, binding strap 9.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the present invention; Should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
Shown in Fig. 1～5, the invention provides a kind of subgrade does not have sand cushion vacuum-preloading joint preloading bracing means and method.The present invention specifically realizes through following steps:
Construction operation is prepared in step 1, cleaning job site.
(1) plastic draining board sets scope, the degree of depth and spacing and should adhere to specification;
(2) setting and should notice at any time in the process that control sets verticality, its deviation should be not more than ± and 1.5%;
Forbid kink to occur, rupture and tear phenomenons such as film when (3) setting plastic draining board;
(4) after plastic draining board sets and finishes, should in time bury monitoring instrument underground, and carry out the protection work of instrument according to design attitude on the drawing.
Step 4, laying Water penetrative flexible pipe.And plastic draining board is connected with the Water penetrative flexible pipe colligation.The junction of plastic draining board and Water penetrative flexible pipe prevents earth seepage, obstruction with non-woven geotextile binding strap parcel.
Step 5, sanding cover Water penetrative flexible pipe.Only need to cover Water penetrative flexible pipe, and need not cover other zone except that Water penetrative flexible pipe, make plastic draining board, Water penetrative flexible pipe, sand connect unimpeded drainage system of formation and vacuum pressure transmission system with sand.
Step 6, Water penetrative flexible pipe is connected with vacuum pumping pump, and above Water penetrative flexible pipe, re-lays one deck non-woven geotextile.
Step 8, vacuumize and preloading construction.Construction begins to vacuumize after everything is ready, on diaphragm seal, lays one deck non-woven geotextile behind the vacustat, bankets then, bankets to design height, carries out vacuum-preloading joint preloading.
Step 9, unloading.Satisfying under the prerequisite that vacuum requires, answer continuous air extraction, when behind the settlement stability, reaching can removal vacuum load when unloading vacuum standard.The present invention mainly utilizes Water penetrative flexible pipe and non-woven geotextile to constitute no sand cushion, replaces original sand cushion thereby only around chimney filter, cover layer of sand composition drainage system.
Claims (3)
1. a subgrade does not have sand cushion vacuum-preloading joint preloading bracing means; It is characterized in that: comprise plastic draining board, Water penetrative flexible pipe, first floor non-woven geotextile, second layer non-woven geotextile, the 3rd layer of non-woven geotextile, diaphragm seal and vacuum extractor; Said plastic draining board evenly distributes and vertically inserts subgrade; Said first floor non-woven geotextile is laid on to be treated on the stabilization zone face of land; Said Water penetrative flexible pipe is tiled on the first floor non-woven geotextile and around Water penetrative flexible pipe, covers medium sand, is connected with vacuum extractor more simultaneously with after said plastic draining board is connected; Said second layer non-woven geotextile, diaphragm seal and the 3rd layer of non-woven geotextile once-paving are on Water penetrative flexible pipe, and the preloading of on the 3rd layer of non-woven geotextile, banketing.
2. do not have sand cushion vacuum-preloading joint preloading bracing means according to the said subgrade of claim 1, it is characterized in that: in placing into the soil in said diaphragm seal edge.
3. reinforcement means that utilizes the said subgrade of claim 1 not have sand cushion vacuum-charge preloading consolidation device is characterized in that may further comprise the steps:
(1) earlier plastic draining board, Water penetrative flexible pipe, first floor non-woven geotextile, second layer non-woven geotextile, diaphragm seal and vacuum extractor are in place after, start vacuum extractor up to vacustat under the diaphragm seal more than 80kPa;
(2) continue then to lay the 3rd layer of non-woven geotextile, and the preloading of banketing above that, carry out joint preloading;
(3) reach and unload vacuum and require back removal vacuum load, construction finishes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012102155686A CN102704458A (en) | 2012-06-27 | 2012-06-27 | Sand-free cushion layer vacuum-surcharge preloading reinforcement device and method for soft ground |
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| CN2012102155686A CN102704458A (en) | 2012-06-27 | 2012-06-27 | Sand-free cushion layer vacuum-surcharge preloading reinforcement device and method for soft ground |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306268A (en) * | 2013-05-23 | 2013-09-18 | 南京盼源工程技术有限公司 | Anti-blocking controllable negative pressure quick solidifying system for flow state dredging silt |
| CN103306269A (en) * | 2013-05-23 | 2013-09-18 | 南京盼源工程技术有限公司 | Anti-blocking controllable negative pressure quick solidifying method for flow state dredging silt |
| CN105239554A (en) * | 2015-08-27 | 2016-01-13 | 上海十三冶建设有限公司 | Vacuum and preloading drainage structure with low-permeability sand layers and construction method |
| CN105780754A (en) * | 2016-03-29 | 2016-07-20 | 河海大学 | Sand-bed-free vacuum preloading and water bag heaped loading combined reinforcing device and method for soft soil foundation |
| CN107447745A (en) * | 2017-08-27 | 2017-12-08 | 江苏中联路基工程有限公司 | A kind of connection system of compound drop thicker water discharge member and transverse drain |
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| JP2003166233A (en) * | 2001-11-29 | 2003-06-13 | Hazama Gumi Ltd | Ground improvement structure and construction method by vacuum consolidation |
| CN1837498A (en) * | 2006-02-28 | 2006-09-27 | 广州四航工程技术研究院 | Sand cushion-free pre-compacting water-draining consolidation method for soft soil foundation |
| CN101324063A (en) * | 2008-08-06 | 2008-12-17 | 上海港湾软地基处理工程有限公司 | Special soft foundation consolidation method |
| CN101591905A (en) * | 2009-06-03 | 2009-12-02 | 叶凝雯 | The newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method |
| CN101806057A (en) * | 2010-04-28 | 2010-08-18 | 河海大学 | Immediate processing method for hydraulic filling ultra-soft foundation by modified vacuum preloading and water-covering preloading |
-
2012
- 2012-06-27 CN CN2012102155686A patent/CN102704458A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003166233A (en) * | 2001-11-29 | 2003-06-13 | Hazama Gumi Ltd | Ground improvement structure and construction method by vacuum consolidation |
| CN1837498A (en) * | 2006-02-28 | 2006-09-27 | 广州四航工程技术研究院 | Sand cushion-free pre-compacting water-draining consolidation method for soft soil foundation |
| CN101324063A (en) * | 2008-08-06 | 2008-12-17 | 上海港湾软地基处理工程有限公司 | Special soft foundation consolidation method |
| CN101591905A (en) * | 2009-06-03 | 2009-12-02 | 叶凝雯 | The newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method |
| CN101806057A (en) * | 2010-04-28 | 2010-08-18 | 河海大学 | Immediate processing method for hydraulic filling ultra-soft foundation by modified vacuum preloading and water-covering preloading |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306268A (en) * | 2013-05-23 | 2013-09-18 | 南京盼源工程技术有限公司 | Anti-blocking controllable negative pressure quick solidifying system for flow state dredging silt |
| CN103306269A (en) * | 2013-05-23 | 2013-09-18 | 南京盼源工程技术有限公司 | Anti-blocking controllable negative pressure quick solidifying method for flow state dredging silt |
| CN103306268B (en) * | 2013-05-23 | 2015-07-29 | 南京盼源工程技术有限公司 | The rapidly solidified system of the anti-blocking controllable negative pressure of fluidised form dredging silt |
| CN103306269B (en) * | 2013-05-23 | 2015-09-30 | 南京盼源工程技术有限公司 | The anti-blocking controllable negative pressure quick consolidation method of fluidised form dredging silt |
| CN105239554A (en) * | 2015-08-27 | 2016-01-13 | 上海十三冶建设有限公司 | Vacuum and preloading drainage structure with low-permeability sand layers and construction method |
| CN105780754A (en) * | 2016-03-29 | 2016-07-20 | 河海大学 | Sand-bed-free vacuum preloading and water bag heaped loading combined reinforcing device and method for soft soil foundation |
| CN107447745A (en) * | 2017-08-27 | 2017-12-08 | 江苏中联路基工程有限公司 | A kind of connection system of compound drop thicker water discharge member and transverse drain |
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Application publication date: 20121003 |