CN1228494A - Vacuum deep well reinforcing method for large thickness soft soil foundation - Google Patents
Vacuum deep well reinforcing method for large thickness soft soil foundation Download PDFInfo
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- CN1228494A CN1228494A CN 98100890 CN98100890A CN1228494A CN 1228494 A CN1228494 A CN 1228494A CN 98100890 CN98100890 CN 98100890 CN 98100890 A CN98100890 A CN 98100890A CN 1228494 A CN1228494 A CN 1228494A
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Abstract
The method for reinforcing large-thickness soft soil foundation by vacuum deep-well includes the following steps: drilling through soft soil layer to form deep well, placing well pipe with reverse filter into the deep well, placing the deep well pump into the bottom of the well, sealing well mouth, using vacuum pump to evacuate the deep well, discharging the interstitial water being in the soil layer into the deep well, when the water level in the deep well is reached to the preset upper limited water level, the deep-well pump can automatically pump water, and when the water level is lowered to lower limited water level, the deep-well pump can automatically stop. Its reinforced effect is not limited by reinforcing depth and area, and can make soft soil layer obtain good and uniform reinforced effect. It can be extensively used in various engineerings.
Description
The present invention relates to the method for ground preloading large thickness soft soil foundation in a kind of construction work.
The method of existing ground preloading large thickness soft soil foundation, comprise vacuum method and preloading, vacuum method is that vertical and horizontal drainage passage are set in the weak soil layer, covering sealing film, under film, vacuumize, cause the inside and outside pressure differential of film to come the soft foundation load application is made it discharging consolidation.As the clear 52-46407 patent of Japan and Chinese patent 85108820 all are, some difference on the method for handling sealing film just.This method has been owing to be full of water in drainage channel, Tu Zhongkongxishui is subjected to the restriction of head pressure and well resistance effect in the vertical passageway when discharging, and the discharging consolidation effect will decay with the degree of depth, just can not again discharging consolidation take place below critical depth.So this vacuum method can only make shallow layer soft soil obtain to reinforce.And drainage efficiency reduces and reduces gradually along with pore pressure.In addition, once reinforcing area is restricted because of film covers sealing area.
The method that the purpose of this invention is to provide a kind of vacuum deep well reinforcing large thickness soft soil foundation is evenly reinforced whole weak soil layer, the restriction that is not subjected to reinforcement depth and reinforces area.
Technical scheme of the present invention is:
The method of this vacuum deep well reinforcing large thickness soft soil foundation is characterized in that construction sequence is:
(1). use the rig pore-forming earlier, pass the weak soil layer and become deep-well;
(2). in deep-well, put into the well casing of band loaded filter;
(3). deep well pump is put into the shaft bottom;
(4). the sealing well head;
(5). with vacuum pump deep-well is vacuumized, make soil layer mesopore water enter deep-well;
(6). when water level in the deep-well reached predetermined upper limit water level, deep well pump drew water automatically;
(7). when water level dropped to the predetermined lower bound water level, deep well pump stopped automatically.
The well casing of above-mentioned band loaded filter can be that the body outsourcing water filtering textile that is evenly distributed with penetrating hole is made.
The well casing of above-mentioned band loaded filter can be that the reinforcing cage outsourcing drainage wire lath or the non-metallic fabrics that are evenly distributed with penetrating hole are made.
Above-mentioned sealing is at well head sealing to be housed to lead letter, fills with microlith between the well casing and the borehole wall, and the hole cover top cover labyrinth covers vacuum meter is housed.
The present invention adopts heavy caliber (φ 800-φ 1000 commonly used) the deep-well draining of passing the weak soil layer, add sealing-plug at well head, deep-well to sky vacuumizes, make negative-pressure sucking Pa-Pv (Pa-atmospheric pressure is all arranged in the whole deep-well from top to down, pressure after vacuumizing in the Pv-deep-well), impel pore water to enter deep-well, collect in bottom along horizontal radial.After water level reach a certain height, water pump startup automatically drew water.So the drainage efficiency of weak soil layer is not decayed with the degree of depth in time.And deep-well is the effect of precipitation well in fact still, along with the reduction of groundwater table, the deadweight of weak soil layer is increased, and promptly total stress increases.So this method also has the effect of precipitating, pre-pressing.Common engineering all has fill stratum on the weak soil layer, this just can form piling prepressing.Therefore, the present invention combines vacuum preloading, precipitating, pre-pressing and piling prepressing three together and plays a role simultaneously.Because the total stress of precipitating, pre-pressing is to increase with the degree of depth, then opposite during piling prepressing, total stress is to reduce with the degree of depth, the vacuum drainage effect is identical up and down, integrate, make whole weak soil layer obtain essentially identical consolidation effect up and down, solved the problem that general reinforcement means can not be reinforced weak substratum.Be specially adapted to horizontal permeation coefficient bigger delta weak soil layer and barged-in fill ground.
Advantage of the present invention: when reinforcing soft ground, the restriction that is not subjected to reinforcement depth and reinforces area makes whole weak soil layer all obtain consolidation effect relatively uniformly, and the large tracts of land that has solved deep layer (more than 10 meters) soft foundation is reinforced problem.This vacuum deep well system seals easily, and drainage effect is good under the negative-pressure sucking effect.About tens square metres of the reinforcing scope of a bite well, the average reinforcing expense of unit volume is not high, is a kind of economic and practical method.Be widely used in roadbed, harbour, airport, goods yard, building and urban operating mechanism etc. and need carry out the engineering of reinforced soft soil ground.
Below in conjunction with drawings and Examples the present invention is described in detail:
Fig. 1 is a job site of the present invention schematic diagram.
As shown in the figure, the method for this vacuum deep well reinforcing large thickness soft soil foundation the steps include:
(1). use the rig pore-forming earlier, pass the weak soil layer and become deep-well, the plan-position of deep-well can arrange that φ 800-φ 1000 is used in the aperture always by equilateral triangle.
(2). in deep-well, put into the well casing 4 of band loaded filter; The well casing of band loaded filter can be reinforcing cage parcel mesh wire gauze, a drainage non-metallic fabrics from big to small, also can be that thin-wall steel tube outsourcing geotechnique's water filtering textile and draining band with holes made.
(3). deep well pump 5 is put into the shaft bottom; Hole cover top cover labyrinth 10 covers the vacuum meter 9 that vacuum in the observation well is housed, and the pipeline 11 that vacuumizes is access to vacuum house steward and vacuum pump.
(4). the sealing well head; The well head sealing means can be equipped with sealing casing 1 at well head, and for guaranteeing sealing, draining smoothly, ground covers with drilling mud around the sealing casing 1, fills with microlith 3 between the well casing 4 and the borehole wall 2, uses the clear water circulation well cleanup again, discharges mud.
(5). with vacuum pump deep-well is vacuumized, make soil layer mesopore water enter deep-well.
(6). when water level in the deep-well reached predetermined upper limit water level 6, deep well pump drew water automatically.
(7). when water level dropped to predetermined lower bound water level 7, deep well pump stopped automatically.So just guarantee all discharging consolidation under negative pressure of vacuum of whole well casing weak soil layer on every side, until the consolidation effect that obtains to require.
Claims (4)
1, a kind of method of vacuum deep well reinforcing large thickness soft soil foundation is characterized in that construction sequence is:
(1). use the rig pore-forming earlier, pass the weak soil layer and become deep-well;
(2). in deep-well, put into the well casing of band loaded filter;
(3). deep well pump is put into the shaft bottom;
(4). the sealing well head;
(5). with vacuum pump deep-well is vacuumized, make soil layer mesopore water enter deep-well;
(6). when water level in the deep-well reached predetermined upper limit water level, deep well pump drew water automatically;
(7). when water level dropped to the predetermined lower bound water level, deep well pump stopped automatically.
2, according to the method for the described vacuum deep well reinforcing large thickness soft soil foundation of claim 1 (2), it is characterized in that: the well casing of described band loaded filter is that the body outsourcing water filtering textile that is evenly distributed with penetrating hole is made.
3, according to the method for the described vacuum deep well reinforcing large thickness soft soil foundation of claim 1 (2), it is characterized in that: the well casing of described band loaded filter is that the reinforcing cage outsourcing drainage wire lath or the non-metallic fabrics that are evenly distributed with penetrating hole are made.
4, according to the method for the described vacuum deep well reinforcing large thickness soft soil foundation of claim 1 (4), it is characterized in that: described sealing is at well head the sealing guide to be housed, and fills with microlith between the well casing and the borehole wall, and the hole cover top cover labyrinth covers vacuum meter is housed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100890 CN1228494A (en) | 1998-03-06 | 1998-03-06 | Vacuum deep well reinforcing method for large thickness soft soil foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100890 CN1228494A (en) | 1998-03-06 | 1998-03-06 | Vacuum deep well reinforcing method for large thickness soft soil foundation |
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| Publication Number | Publication Date |
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| CN1228494A true CN1228494A (en) | 1999-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 98100890 Pending CN1228494A (en) | 1998-03-06 | 1998-03-06 | Vacuum deep well reinforcing method for large thickness soft soil foundation |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293263C (en) * | 2004-11-25 | 2007-01-03 | 徐士龙 | Method of soft ground treatment using high vacuum variable energy cross tampering |
| CN102425152A (en) * | 2011-09-02 | 2012-04-25 | 广东水电二局股份有限公司 | Device for rapidly consolidating soft foundation and construction method |
| CN102605761A (en) * | 2012-04-18 | 2012-07-25 | 新疆电力设计院 | Layering and humidifying construction method of foundation soil mass sand well |
| CN104047280A (en) * | 2014-06-14 | 2014-09-17 | 叶吉 | Soft foundation fast separating and punning method |
| CN104060621A (en) * | 2013-09-03 | 2014-09-24 | 中国建筑第四工程局有限公司 | Construction method for super vacuum dewatering well and well tube structure used in construction method |
| CN104141295A (en) * | 2013-05-07 | 2014-11-12 | 上海交通建设总承包有限公司 | Soft soil foundation combined treatment method |
| CN104294812A (en) * | 2014-09-09 | 2015-01-21 | 江苏鑫泰岩土科技有限公司 | Tumbler-type water collecting device for vacuum preloading |
| CN105887794A (en) * | 2016-04-13 | 2016-08-24 | 黄明 | Pretreatment method for super-thick waste soil foundation |
| CN106120701A (en) * | 2016-08-23 | 2016-11-16 | 河海大学 | Prepressing structure and method for Perioperative cardiac events blowing-filling sludge epeirogenetic |
| CN107700471A (en) * | 2017-09-29 | 2018-02-16 | 中国市政工程华北设计研究总院有限公司 | A kind of new subdrain body suitable for low Low Level vacuum method |
| CN109944263A (en) * | 2019-03-22 | 2019-06-28 | 同济大学 | Double vacuum drainage precipitation systems and method |
-
1998
- 1998-03-06 CN CN 98100890 patent/CN1228494A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293263C (en) * | 2004-11-25 | 2007-01-03 | 徐士龙 | Method of soft ground treatment using high vacuum variable energy cross tampering |
| CN102425152A (en) * | 2011-09-02 | 2012-04-25 | 广东水电二局股份有限公司 | Device for rapidly consolidating soft foundation and construction method |
| CN102605761A (en) * | 2012-04-18 | 2012-07-25 | 新疆电力设计院 | Layering and humidifying construction method of foundation soil mass sand well |
| CN104141295A (en) * | 2013-05-07 | 2014-11-12 | 上海交通建设总承包有限公司 | Soft soil foundation combined treatment method |
| CN104141295B (en) * | 2013-05-07 | 2017-03-15 | 上海交通建设总承包有限公司 | Soft soil foundation compounding method |
| CN104060621A (en) * | 2013-09-03 | 2014-09-24 | 中国建筑第四工程局有限公司 | Construction method for super vacuum dewatering well and well tube structure used in construction method |
| CN104047280A (en) * | 2014-06-14 | 2014-09-17 | 叶吉 | Soft foundation fast separating and punning method |
| CN104047280B (en) * | 2014-06-14 | 2016-06-22 | 叶吉 | Soft foundation sharp separation compacting method |
| CN104294812B (en) * | 2014-09-09 | 2016-08-24 | 江苏鑫泰岩土科技有限公司 | Vacuum preloading roly-poly type captation |
| CN104294812A (en) * | 2014-09-09 | 2015-01-21 | 江苏鑫泰岩土科技有限公司 | Tumbler-type water collecting device for vacuum preloading |
| CN105887794A (en) * | 2016-04-13 | 2016-08-24 | 黄明 | Pretreatment method for super-thick waste soil foundation |
| CN106120701A (en) * | 2016-08-23 | 2016-11-16 | 河海大学 | Prepressing structure and method for Perioperative cardiac events blowing-filling sludge epeirogenetic |
| CN106120701B (en) * | 2016-08-23 | 2018-10-09 | 河海大学 | Prepressing structure and method for Perioperative cardiac events blowing-filling sludge epeirogenetic |
| CN107700471A (en) * | 2017-09-29 | 2018-02-16 | 中国市政工程华北设计研究总院有限公司 | A kind of new subdrain body suitable for low Low Level vacuum method |
| CN107700471B (en) * | 2017-09-29 | 2024-01-30 | 中国市政工程华北设计研究总院有限公司 | Low-level drainage body suitable for ultra-low-level vacuum preloading method |
| CN109944263A (en) * | 2019-03-22 | 2019-06-28 | 同济大学 | Double vacuum drainage precipitation systems and method |
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