CN101476315A - Method for processing soft foundation by net bag method - Google Patents
Method for processing soft foundation by net bag method Download PDFInfo
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- CN101476315A CN101476315A CNA2009100209355A CN200910020935A CN101476315A CN 101476315 A CN101476315 A CN 101476315A CN A2009100209355 A CNA2009100209355 A CN A2009100209355A CN 200910020935 A CN200910020935 A CN 200910020935A CN 101476315 A CN101476315 A CN 101476315A
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Abstract
The invention provides a method for treating weak foundation by mesh bag method, which comprises: weaving mesh bags by macromolecular engineering materials, filling the mesh bags with sandstones as aggregate; planting into the holes drilled in the foundation and filling the holes with sandstone aggregate to form mesh bag sandstone piles; laying the mesh pieces woven by macromolecular engineering material and pad layer consisted of sandstone aggregate on the top surface of the pile and foundation; connecting the mesh open on the top of the mesh bag broken stone pile with the mesh pieces thereon; thus, the mesh and the mesh bags are connected into a complete reinforcing body in the foundation, and the reinforcing body and the original foundation together form a composite foundation. The invention is a simple and easy method, uses the polyethylene and polypropylene macromolecular engineering material with the advantages of high strength, acid-base resistance, anti-aging and anticorrosion; is more suitable for foundation treatment in salinized soil region with high corrosion to concrete and steel; achieves higher integrity of reinforcing body, can greatly increase the foundation bearing capacity and reduce settlement amount to reach the building design requirement.
Description
Technical field
The invention belongs to the building lot processing technology field, be specifically related to a kind of method that concrete and steel is had the processing soft foundation by net bag method that the ground of the saline soil area of deep-etching handles that is suitable for.
Background technology
Any building all will be built on the ground, so foundation quality directly influences the safety of building.Most natural grounds all do not satisfy the requirement of architectural design, need carry out artificial treatment.Selecting for use except depending on the requirement of building to ground of processing method also depended on the mechanical property of former ground soil layer.Weak foundation soil generally all needs to handle and transform as building lot.Although build dealer research at present and invented many processing methods, from technology and economically, existing soft foundation processing method does not also satisfy the requirement of architectural design.The foundation soil processing method of soft the moulding of not draining fastness to alkali Cu＜20kPa～stream being moulded state is less, especially salinized soil is amassed in the lake in area, Cha Er sweat salt lake, Tu poor mechanical property not only, also main constructional materials concrete and steel are had the deep-etching effect, the method for handling this ground just still less.The present invention is at this subject study and test out " processing soft foundation by net bag method method ".
The soft foundation processing method now mainly contains:
1, sand-gravel pile method, in soft foundation, use general, because stake week is native little to the limit power of enclosing of stake, Bearing Capacity of Composite Foundation improves limited, especially be used in the salinized soil soft foundation handle in bearing capacity to improve maximum be a times of former foundation soil, in moulding the salinized soil of state, stream can only improve 50%, and construction groundwork soil recovery time long (2～3 months).
2, dynamic compaction and dynamic replacement method, the foundation soil of soft foundation all is a saturated soil, and the water content height does not only have compression and compacted effect to foundation soil, easily forms " spongy soil " on the contrary, and bearing capacity improves limited especially.
Above two kinds of methods when handling undrained shear strength Cu＜20kPa foundation soil, bearing capacity of foundation soil is doubled the comparison difficulty.Additive method such as deep mixing cement pile, CFG stake and pulverized-coal-ash pile etc. are used in the soft stratum of salinized soil and all can can't be adopted because of the bittern deep-etching.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of easy construction is provided, easy operating, cost is low, can increase substantially the method for bearing capacity with the processing soft foundation by net bag method that reduces settling amount of ground, with the bulk strength of raising ground and the intensity of foundation soil, avoid ground local differential settlement to occur.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of method of processing soft foundation by net bag method is characterized in that processing procedure is:
(1) on former ground, uses the spiral drilling machine construction drill;
(2) mesh bag with the acid-alkali-corrosive-resisting made is lowered in the boring;
(3) sandstone aggregate of filling with acid-alkali-corrosive-resisting in mesh bag forms the mesh bag sand-gravel pile;
(4) leveling mesh bag sand-gravel pile pile crown is laid first floor net sheet on described mesh bag sand-gravel pile, the mesh bag mouth at mesh bag sand-gravel pile top is connected with first floor net sheet;
(5) on first floor net sheet, lay thick sandstone material of 10～15cm and compacting and flatten, form the first floor sand-gravel cushion; On the first floor sand-gravel cushion, lay second layer net sheet, on second layer net sheet, lay the thick sandstone material compacting of 20～30cm and flatten, form second layer sand-gravel cushion.
Boring described in the above-mentioned steps (2) is pressed equilateral triangle and is arranged that bore diameter is 20～50cm for cylindrical on ground, drilling depth is 5～10m, and the pitch-row of adjacent two borings is 0.5～1m; Described mesh bag is cylindrical.
Described mesh bag cross-sectional diameter is greater than boring cross-sectional diameter 10～15mm.
The material of described mesh bag is polyethylene or polypropylene, and the mesh size on the mesh bag is 2 * 2mm～5 * 5mm.
The particle diameter of sandstone aggregate is less than 50mm described in the above-mentioned steps (3), and the size grading of sandstone aggregate is even.
Gravel size grating described in the above-mentioned steps (5) on the first floor net sheet is even, and gravel size is less than 20mm; Gravel size grating on the described second layer net sheet is even, and gravel size is less than 50mm.
Technical thought of the present invention: be compiled into mesh bag with the macromolecule engineering material, in mesh bag, fill with aggregates such as sandstone, be implanted in the boring of implementing in the ground and fill with sandstone aggregate and form the mesh bag sand-gravel pile, lay aggregates such as the net sheet of macromolecule engineering material establishment and sandstone at stake and ground end face and form bed course, the network interface on mesh bag sand-gravel pile top is linked with its upper wire sheet, net and mesh bag link in ground forms a complete solid that adds together, form composite foundation jointly with former foundation soil again, increase substantially the bearing capacity of ground and reduce settling amount, make it reach the requirement of architectural design.Macromolecule engineering materials such as polyethylene that the present invention uses and polypropylene have intensity height, antiacid alkali, ageing-resistant, etch-proof advantage, and more being applicable to has the ground of deep-etching saline soil area to handle to concrete and steel.Because it is better to add the solid integrality, so the Bearing Capacity of Composite Foundation after handling can improve 3～5 times than former ground bearing capacity.
The present invention compared with prior art has the following advantages:
1, mesh bag sand-gravel pile and top sand-gravel cushion are linked into one by mesh bag and net sheet, the sedimentation of pile body is retrained by the net sheet in the bed course when moving down, the net sheet again with bed course in the sandstone interlock tight, then the net sector-meeting produces pulling force to the mesh bag sand-gravel pile, improves the vertical bearing capacity of stake and reduces settling amount;
2, owing to the net sheet effect in the bed course, adjustment stake and foundation soil are evenly shared upper load, and assurance stake, soil are born upper load simultaneously, and the bulk strength of raising ground avoids ground local differential settlement to occur;
3, the pile body of mesh bag and sandstone composition not only plays metathesis to weak foundation soil, and because of its good water permeability, mesh bag sandstone pile body is an excellent drainage channel in the soft foundation, shortens water horizontal permeation path, foundation soil mesopore, quicken the weak soil discharging consolidation, improve the intensity of foundation soil;
4, use the macromolecule engineering material to seem and improved material cost, but the sand-gravel pile that the sandstone aggregate amount ratio is equal to saves 30%.During to same bearer power, than now reducing 15%-30% with the method synthesis cost, consolidation effect is also greater than additive method with the method Ground Treatment.
Below by drawings and Examples the present invention is described in further detail.
Description of drawings
Fig. 1 is for adopting the structural representation of the soft foundation after mesh bag method of the present invention is handled.
Fig. 2 is the transverse cross-sectional view of mesh bag sand-gravel pile in the inventive method.
Among the figure: 1-mesh bag, 2-first floor net sheet, 3-second layer net sheet, 4-drill hole wall, 5-sandstone aggregate, 6-net sheet and mesh bag tie point, 7-first floor sand-gravel cushion, 8-second layer sand-gravel cushion, 9-mesh bag sand-gravel pile.
The specific embodiment
As depicted in figs. 1 and 2, the method for processing soft foundation by net bag method of the present invention, concrete processing procedure is:
(1) on former ground, uses the spiral drilling machine construction drill;
(2) polyethylene or the cylindrical mesh bag 1 of polypropylene with the acid-alkali-corrosive-resisting made is lowered in the cylindrical bore, and boring press equilateral triangle and arranged that bore diameter is 20～50cm on ground, and drilling depth is 5～10m, and adjacent two pitch-rows of holing are 0.5～1m; Described mesh bag 1 cross-sectional diameter makes mesh bag 1 well contact with drill hole wall 4 greater than boring cross-sectional diameter 10～15mm, guarantees that mesh bag 1 entirely descends at the bottom of the hand-hole; Mesh size on the mesh bag 1 is 2 * 2mm～5 * 5mm.
(3) sandstone aggregate 5 of filling with acid-alkali-corrosive-resisting in mesh bag 1 forms mesh bag sand-gravel piles 9, and the size grading of sandstone aggregate is even, and its particle diameter is less than 50mm;
(4) leveling mesh bag sand-gravel pile 9 pile crowns, laying first floor net sheet 2 on described mesh bag sand-gravel pile 9, the mesh bag mouth at mesh bag sand-gravel pile 9 tops and first floor net sheet 2 is bonding or make and be connected;
(5) lay thick sandstone material of 10～15cm and compacting on first floor net sheet 2 and flatten, form first floor sand-gravel cushion 7, the gravel size grating on the first floor net sheet 2 is even, and gravel size is less than 20mm; Lay second layer net sheet 3 on first floor sand-gravel cushion 7, lay the thick sandstone material compacting of 20～30cm and flatten on second layer net sheet 3, form second layer sand-gravel cushion 8, the gravel size grating on the second layer net sheet 3 is even, and gravel size is less than 50mm.
Example and test effect:
Examine critically in Qinghai on the salinized soil soft foundation in your area, sweat salt lake and carry out 500m
2The ground Processing Test.First floor is the silt that contains saturated bittern of thick 4～6m under this face of land, district, and undrained shear strength average Cu=13kPa is in soft moulding～stream and moulds state, and depth to water 0.5～1.0m, underground water are high chlorine bittern, and concrete and steel are had deep-etching.Former ground soil bearing capacity characteristic value is 70KPa, and natural ground can't adopt.Select for use the mesh bag method to carry out ground and handle, mesh bag sand-gravel pile footpath 40cm, the long 6.0m of stake, pilespacing 1.0m presses the full hall of equilateral triangle and arranges boring, adopts the spiral drilling machine construction drill and visits technology with pipe bit, sand-gravel cushion total thickness 50cm uses the two layers of mesh sheet, macromolecule engineering material polypropylene.Carry out three groups of static load checks after the construction, characteristic load bearing capacity is greater than 280kPa, and settling amount is average out to 28.6mm when characteristic load bearing capacity 280kPa; Handle the back Bearing Capacity of Composite Foundation and improve 4～5 times than former ground bearing capacity (70kPa), settling amount is 20%-10% of a former ground.Simultaneously the engineering time shorter than similar sand-gravel pile, foundation soil can shorten to three weeks (be sand-gravel pile method 1/3) recovery time.The mesh bag material that uses is high strength, acid and alkali-resistance, anticorrosive, ageing-resistant polypropylene, guarantees ground application life.
Claims (6)
1. the method for a processing soft foundation by net bag method is characterized in that processing procedure is:
(1) on former ground, uses the spiral drilling machine construction drill;
(2) mesh bag with the acid-alkali-corrosive-resisting made is lowered in the boring;
(3) sandstone aggregate of filling with acid-alkali-corrosive-resisting in mesh bag forms the mesh bag sand-gravel pile;
(4) leveling mesh bag sand-gravel pile pile crown is laid first floor net sheet on described mesh bag sand-gravel pile, the mesh bag mouth at mesh bag sand-gravel pile top is connected with first floor net sheet;
(5) on first floor net sheet, lay thick sandstone material of 10～15cm and compacting and flatten, form the first floor sand-gravel cushion; On the first floor sand-gravel cushion, lay second layer net sheet, on second layer net sheet, lay the thick sandstone material compacting of 20～30cm and flatten, form second layer sand-gravel cushion.
2. the method for processing soft foundation by net bag method according to claim 1 is characterized in that, boring is for cylindrical described in the step (2), pressing equilateral triangle on ground arranges, bore diameter is 20～50cm, and drilling depth is 5～10m, and the pitch-row of adjacent two borings is 0.5～1m; Described mesh bag is cylindrical.
3. the method for processing soft foundation by net bag method according to claim 2 is characterized in that, described mesh bag cross-sectional diameter is greater than boring cross-sectional diameter 10～15mm.
4. the method for processing soft foundation by net bag method according to claim 1 is characterized in that, the material of described mesh bag is polyethylene or polypropylene, and the mesh size on the mesh bag is 2 * 2mm～5 * 5mm.
5. the method for processing soft foundation by net bag method according to claim 1 is characterized in that, the particle diameter of sandstone aggregate is less than 50mm described in the step (3), and the size grading of sandstone aggregate is even.
6. the method for processing soft foundation by net bag method according to claim 1 is characterized in that, the gravel size grating described in the step (5) on the first floor net sheet is even, and gravel size is less than 20mm; Gravel size grating on the described second layer net sheet is even, and gravel size is less than 50mm.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787696A (en) * | 2010-03-23 | 2010-07-28 | 中交第一公路勘察设计研究院有限公司 | Pile filling technology of large-diameter bagged concrete |
| CN101858077A (en) * | 2010-04-27 | 2010-10-13 | 河海大学 | Construction method of composite foundation with bagged compacting and slurry cementing small-diameter gravel pile |
| CN101899828A (en) * | 2010-04-27 | 2010-12-01 | 河海大学 | Construction method of bagged rammed small-diameter soil-cement pile composite foundation |
| CN102155009A (en) * | 2011-05-23 | 2011-08-17 | 中铁二院工程集团有限责任公司 | Crushed rock pile used for strengthening extremely soft soil foundation and construction method thereof |
| CN102465524A (en) * | 2010-11-11 | 2012-05-23 | 上海市政工程设计研究总院 | Double radial mesh-cage sand-gravel pile and construction process thereof |
| CN102912785A (en) * | 2012-11-08 | 2013-02-06 | 沈阳建筑大学 | Similarly arch stacked bagged gravel and sandy soil foundation reinforcement treatment method |
| CN103061226A (en) * | 2013-01-06 | 2013-04-24 | 中国建筑第六工程局有限公司 | Structure and construction method for temporarily reinforcing soft soil foundation |
| CN103243702A (en) * | 2013-05-07 | 2013-08-14 | 中化二建集团有限公司 | Sand wrapped gravel pile construction method |
| CN103437336A (en) * | 2013-08-27 | 2013-12-11 | 武汉中力岩土工程有限公司 | PVC hole-pipe gravel pile and soft foundation processing method thereof |
| CN105019421A (en) * | 2014-04-29 | 2015-11-04 | 中交四航工程研究院有限公司 | Integral composite work cushion layer suitable for ultra-soft land foundation processing |
| CN105544502A (en) * | 2015-12-04 | 2016-05-04 | 中铁第四勘察设计院集团有限公司 | Novel construction method of strengthening pile for deep soft soil foundation |
| CN109750570A (en) * | 2018-12-27 | 2019-05-14 | 广东平润建设工程有限公司 | The construction method on road surface is built on soft foundation |
| CN111520159A (en) * | 2020-05-29 | 2020-08-11 | 中铁二院工程集团有限责任公司 | Tunnel lining structure suitable for surrounding rock to be salt rock stratum |
| CN114197269A (en) * | 2021-11-15 | 2022-03-18 | 鸿厦建设有限公司 | Soft geological soil foundation reinforcement construction method |
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2009
- 2009-01-16 CN CN2009100209355A patent/CN101476315B/en active Active
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787696A (en) * | 2010-03-23 | 2010-07-28 | 中交第一公路勘察设计研究院有限公司 | Pile filling technology of large-diameter bagged concrete |
| CN101858077A (en) * | 2010-04-27 | 2010-10-13 | 河海大学 | Construction method of composite foundation with bagged compacting and slurry cementing small-diameter gravel pile |
| CN101899828A (en) * | 2010-04-27 | 2010-12-01 | 河海大学 | Construction method of bagged rammed small-diameter soil-cement pile composite foundation |
| CN101858077B (en) * | 2010-04-27 | 2011-12-14 | 河海大学 | Construction method of composite foundation with bagged compacting and slurry cementing small-diameter gravel pile |
| CN101899828B (en) * | 2010-04-27 | 2012-05-23 | 河海大学 | Construction method of bagged rammed small-diameter soil-cement pile composite foundation |
| CN102465524B (en) * | 2010-11-11 | 2016-05-25 | 上海市政工程设计研究总院 | Double radial mesh-cage sand-gravel pile and construction technology thereof |
| CN102465524A (en) * | 2010-11-11 | 2012-05-23 | 上海市政工程设计研究总院 | Double radial mesh-cage sand-gravel pile and construction process thereof |
| CN102155009A (en) * | 2011-05-23 | 2011-08-17 | 中铁二院工程集团有限责任公司 | Crushed rock pile used for strengthening extremely soft soil foundation and construction method thereof |
| CN102912785A (en) * | 2012-11-08 | 2013-02-06 | 沈阳建筑大学 | Similarly arch stacked bagged gravel and sandy soil foundation reinforcement treatment method |
| CN103061226A (en) * | 2013-01-06 | 2013-04-24 | 中国建筑第六工程局有限公司 | Structure and construction method for temporarily reinforcing soft soil foundation |
| CN103243702B (en) * | 2013-05-07 | 2015-06-24 | 中化二建集团有限公司 | Sand wrapped gravel pile construction method |
| CN103243702A (en) * | 2013-05-07 | 2013-08-14 | 中化二建集团有限公司 | Sand wrapped gravel pile construction method |
| CN103437336A (en) * | 2013-08-27 | 2013-12-11 | 武汉中力岩土工程有限公司 | PVC hole-pipe gravel pile and soft foundation processing method thereof |
| CN105019421A (en) * | 2014-04-29 | 2015-11-04 | 中交四航工程研究院有限公司 | Integral composite work cushion layer suitable for ultra-soft land foundation processing |
| CN105544502A (en) * | 2015-12-04 | 2016-05-04 | 中铁第四勘察设计院集团有限公司 | Novel construction method of strengthening pile for deep soft soil foundation |
| CN109750570A (en) * | 2018-12-27 | 2019-05-14 | 广东平润建设工程有限公司 | The construction method on road surface is built on soft foundation |
| CN111520159A (en) * | 2020-05-29 | 2020-08-11 | 中铁二院工程集团有限责任公司 | Tunnel lining structure suitable for surrounding rock to be salt rock stratum |
| CN114197269A (en) * | 2021-11-15 | 2022-03-18 | 鸿厦建设有限公司 | Soft geological soil foundation reinforcement construction method |
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Effective date of registration: 20160510 Address after: The 710001 Shaanxi Road, Beilin District Xi'an City, No. 88 Xinxing Hotel, room 711 Patentee after: Shaanxi long fine Construction Engineering Co., Ltd. Address before: 710001, Xinxing Hotel, No. 88 Jianguo Road, Shaanxi, Xi'an, 710 Patentee before: Shaanxi Changjia Industry Development Co., Ltd. |