CN105544502A - Novel construction method of strengthening pile for deep soft soil foundation - Google Patents
Novel construction method of strengthening pile for deep soft soil foundation Download PDFInfo
- Publication number
- CN105544502A CN105544502A CN201510888226.4A CN201510888226A CN105544502A CN 105544502 A CN105544502 A CN 105544502A CN 201510888226 A CN201510888226 A CN 201510888226A CN 105544502 A CN105544502 A CN 105544502A
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- Prior art keywords
- pile
- composite web
- cylinder
- construction
- soft soil
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
Abstract
The invention discloses a novel construction method of a strengthening pile for a deep soft soil foundation. A pile body manufactured according to the novel construction method is a composite mesh cylinder draining granular pile. The composite mesh cylinder draining granular pile is divided into three layers in the radial direction, including an inner pile body filler, a middle mesh cylinder and an outer permeable geomembrane. The middle mesh cylinder is formed by meshes made of a modified polyethylene material or a modified polypropylene material in an enclosed mode. The novel construction method takes a traditional gravel pile as the prototype, uses the innovative thinkings that an enclosure is additionally arranged around an earth bagged gravel pile and draining is realized through a drain pipe pile for reference, improves the enclosure measures intensity and the drainage capacity of a granular pile body, reduces the implementation difficulty and the measure cost of the pile body, covers the shortages of the traditional gravel pile and the earth bagged gravel pile, and enhances the advantages of the traditional gravel pile and the earth bagged gravel pile.
Description
Technical field
The present invention relates to reinforced soft soil ground technical field, refer to a kind of novel deep soft soil foundation reinforcing pile construction particularly.
Background technology
At present, soft foundation is reinforced comprise newly-built and reconstruction passenger traffic freight rail, administrative region of a city railway, inter-city passenger rail, high-speed railway, reinforce to highway communications such as the track traffics such as urban track traffic, highway, speedway, town roads and to the soft foundation of the large-scale siteworks such as airport, port and pier, Logistic Base, power station, comprehensive transportation hub, underground deep-foundation pit engineering, wetland landscape transformation.
Traditional reinforced soft soil ground treatment measures function is relatively single, substantially can be divided into two large classes in a sense: a class is discharging consolidation technology, be and accelerate and improve weak soil body consolidation effect creation drainage condition, fundamentally improve weak soil body engineering property, as sand wick, plastic draining board, vacuum preloading etc., but this kind of technological means is except vacuum preloading, equal consolidation cycle is long, take effect slow, and the ability of final raising foundation capability and control settlement is all very limited, be only suitable for compared with shallow-layer to less demanding especially not high to the requirement of settlement control reinforced soft soil ground of composite foundation supporting capacity.Another kind of is adopt pile body to reinforce means, a kind of composite foundation is jointly formed to improve ground comprehensive load capacity and settlement Control ability with inter-pile soil body, this kind of measure is divided into again: the (1) compacted displacement stake of low-intensity discrete material (granular pile), as crushed stone bed course, crushed stone pile, ash (cement) native compaction pile etc.; (2) intensity and the good flexible pile of globality, as cement mixing method, rotary churning pile, CFG stake etc.; (3) intensity and globality better semi-rigid, rigid pile, as plain concrete pile, reinforced concrete pile etc., this kind of reinforcing pile mode instant effect, but need to rely on one or more layers better natural ground bearing stratum within the scope of subsidiary stress influence depth, and inter-pile soil body can not be passed in time and continue to improve, the later stage also there will be the possibility that consolidation effect is decayed.
Summary of the invention
Object of the present invention is exactly the deficiency that will solve above-mentioned background technology, provides a kind of novel deep soft soil foundation reinforcing pile construction, and its reinforcing pile manufactured can improve composite foundation comprehensive load capacity and settlement Control ability simultaneously.
Technical scheme of the present invention is: a kind of novel deep soft soil foundation reinforcing pile construction, and it is characterized in that, it comprises the following steps:
1) set construction hole at reservation construction location, and retaining wall process is carried out to construction hole;
2) composite web cylinder is made: composite web cylinder is the through column structure of axis that inner layer net cylinder and outer permeable geomembrane are formed, and the external diameter of composite web cylinder is less than construction hole internal diameter, and the height of composite web cylinder is consistent with construction hole height;
3) by step 2) the complete sinking of composite web cylinder made is placed in construction hole;
4) preprepared particulate material is injected in composite web cylinder from composite web nozzle, and make filler closely knit, the stake of composite web cylinder drainage aggregate can be formed.
Further, step 1) in, take the construction technology of the vibration sinking tube compacted pore-forming do not fetched earth to set construction hole; Correspondingly, step 4) in, pellet is filled in after in composite web cylinder completely, immersed tube pulls out, immersed tube pulls out vibration in process filler can be made closely knit, after immersed tube is extracted, implement the construction of next root composite web cylinder drainage aggregate stake.
Preferably, step 2) in, composite web cylinder is prefabricated subsection formula composite web cylinder; Correspondingly, step 3) in, prefabricated sectional type composite web cylinder is thrown in section by section in construction hole, until be sink at the bottom of hole, in work progress, is spliced by band between adjacent segment net cylinder.
Further, described band comprises pricks bar and fore shaft, and a side of described bundle bar is provided with multiple pawl be arranged side by side, and described fore shaft is arranged on pricks bar one end, and described fore shaft can carry out single-way moving on described bundle bar, and locks.
Another kind preferably, step 2) in, the preparation method of composite web cylinder is: be attached on jacket casing pipe by the internal layer mesh sheet that outside has permeable geomembrane, revoling tube, directly be rolled into axially through net barrel structure, radial direction one side of mesh sheet is laminated on mesh sheet another side radial, makes the Mosaic face part superposition of mesh sheet; Correspondingly, step 3) in, while net cylinder rolls, by the composite web cylinder made to sinking in construction hole, until the whole complete sinking of net cylinder completed is in construction hole.
Further, step 4) the composite web cylinder drainage aggregate stake made radially divides three layers of layout, comprises internal layer pile body, middle level net cylinder and the permeable geomembrane of skin respectively; The material of described internal layer pile body is pellet, and described net cylinder is that the mesh sheet that modified polyethylene material or modified polypropylene material are made surrounds, and described net cylinder is wrapped in described pile body radial outer wall, and described permeable geomembrane is packaged in described net cylinder radial outer wall.
Illustrated deep soft soil foundation reinforcing pile construction, increase periphery can to conventional pellets pile body and go along with sb. to guard him measure, weaken or eliminate the stress dissipation effect of traditional pile body, significantly improve pile body stress and stress-bearing capability, simultaneously by the innovation of pile body structure, make pile body have powerful lasting drainability concurrently simultaneously, significantly improve the ability of the consolidation rate of weak soil body, the degree of consolidation and strengthening later stage soft soil consolidation effect.
Accompanying drawing explanation
Fig. 1 is the composite web cylinder drainage aggregate pilework schematic diagram adopting illustrated construction to manufacture;
Band structural representation in the present invention of Fig. 2 position.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The one novel deep soft soil foundation reinforcing pile construction that the present embodiment is shown, it comprises the following steps:
1) according to formation condition, engineering type and the design reinforcement such as character, reinforcement criteria processing scheme;
2) take the construction technology of the vibration sinking tube compacted pore-forming do not fetched earth to set construction hole at reservation construction location, after construction hole sets, immersed tube can serve as the retaining wall in construction hole, namely completes the retaining wall treatment process in construction hole;
3) composite web cylinder is made: composite web cylinder is the through column structure of axis that inner layer net cylinder and outer permeable geomembrane are formed, and the external diameter of composite web cylinder is less than construction hole internal diameter, and the height of composite web cylinder is consistent with construction hole height;
4) by step 3) the complete sinking of composite web cylinder made is placed in construction hole;
5) preprepared particulate material is injected in composite web cylinder from composite web nozzle, and make filler closely knit, the composite web cylinder drainage aggregate stake shown in Fig. 1 can be formed; In addition, step 2) in immersed tube need on pull out to reuse, immersed tube pulls out vibration in process can make filler closely knit, after immersed tube is extracted, immersed tube can be used as the construction of next root composite web cylinder drainage aggregate stake, and the external diameter due to composite web cylinder is slightly less than construction hole internal diameter, after extracting immersed tube, immersed tube periphery is produced lax by compacted soil layer, can eliminate well inhibition effect and the film coating perfonnance of vibration sinking tube generation better, more be conducive to the draining of saturated pore water.
The composite web cylinder of the present embodiment can be prefabricated subsection formula composite web cylinder (joint that manufacturer production becomes to be convenient to transport is long); Correspondingly, step 3) in, prefabricated sectional type composite web cylinder is thrown in in construction hole, section by section until be sink at the bottom of hole, in work progress, spliced by band between adjacent segment net cylinder, with reference to figure 2, above-mentioned band comprises pricks bar 4 and fore shaft 5, the side pricking bar 4 is provided with multiple pawl 4.1 be arranged side by side, fore shaft 5 is arranged on pricks bar 4 one end, and fore shaft 5 can carry out single-way moving on bundle bar 4, and locks.When the Mosaic face of mesh sheet splices, bundle bar 4 one end not with fore shaft 5 is successively through two Mosaic faces of mesh sheet, and the fore shaft 5 being positioned at and pricking bar 4 other end is pierced in bundle bar 4 one end subsequently not with fore shaft 5, and bar 4 is pricked in tension, make bundle bar 4 one-way locking, the mutual splicing of two Mosaic faces of mesh sheet can be completed.
The composite web cylinder of the present embodiment also can be field fabrication, its preparation method is: be attached on jacket casing pipe by the internal layer mesh sheet that outside has permeable geomembrane, revoling tube, directly be rolled into axially through net barrel structure, radial direction one side of mesh sheet is laminated on mesh sheet another side radial, make the Mosaic face of mesh sheet local have the coincidence of 5cm at least, when netting length direction is not enough, above-mentioned band also can be adopted to splice; Correspondingly, step 3) in, while net cylinder rolls, by the composite web cylinder made to sinking in construction hole, until the whole complete sinking of net cylinder completed is in construction hole.
6, one according to claim 1 novel deep soft soil foundation reinforcing pile construction, it is characterized in that: step 4) the composite web cylinder drainage aggregate stake made radially divides three layers of layout, comprises internal layer pile body, middle level net cylinder and the permeable geomembrane of skin respectively; The material of described internal layer pile body is pellet, and described net cylinder is that the mesh sheet that modified polyethylene material or modified polypropylene material are made surrounds, and described net cylinder is wrapped in described pile body radial outer wall, and described permeable geomembrane is packaged in described net cylinder radial outer wall.
With reference to figure 1 and Fig. 2, the composite web barrel structure drainage aggregate stake adopting above-mentioned enforcement engineering method to manufacture, radially divides three layers of layout, comprises middle level net cylinder 2 and the permeable geomembrane 3 of skin of internal layer pile body 1 and formation composite web cylinder respectively.
The internal layer pile body 1 of the present embodiment is the prose style free from parallelism pellets such as rubble, advocates and adopts the good building debris rubbish of intensity---concrete block, concrete block adopts rubble Mechanical Crushing to make, and screens out particulate composition, forms artificial grain's material that size grading is good.Can make full use of building waste or building waste like this, realizing the cyclic utilization of waste, is a kind of sustainable development economy pattern of positive promotion.
The present embodiment is at internal layer pile body 1 outer increase middle level net cylinder 2, the powerful mesh sheet material that this net cylinder 2 is the modified poly ethylene of 2 ~ 4cm or modified polypropene strand bonding for a layer thickness is made, this net barrel structure can eliminate the stress dissipation role impact of traditional broken stone pile well, no matter compared with traditional broken stone pile or compared with the novel pile body such as bag pile, soil engineering bag (film bag) sand loading stone mar occurred in the recent period, vertical bearing capacity and vertical compression contracting non-deformability all been significantly enhanced; Simultaneously because this powerful mesh sheet material has good tension, shearing resistance, incompressible deformability, can at 200 ~ 250KPa (20 ~ 25T/m
2) the radial or vertical pressure of routine under, section void content still remains on about 60%, be no more than the outer pressure of 100 tons, water flowing porosity is still not less than 10%, substantially original geometry can be recovered after being removed by peripheral pressure, its high section porosity, can provide powerful water permeable ability for pile body; Compare with old-fashioned drainage patterns such as plastic draining boards with sand wick, its specific area is larger, non-deformability is stronger, and passage hole is larger, and comprehensive drainability is stronger thoroughly, therefore make the discharging consolidation ability of weak soil body significantly improve, and can also permanently effectively keep after work.
In addition, the mesh sheet material of this kind of net barrel structure also has good shearing resistance, tensile property, though strong not as good as reinforcing bar, but its ductility, corrosion resistances etc. are all better than reinforcing bar, therefore pile body is made also to be provided with certain shearing resistance, tension (pulling out) ability, this performance can play remarkable effect both ways: one is after pile body shear resistance improves, inter-pile soil body better can play soil arching effect, significantly improve earthfill road embankment stability, to the speed of banketing, the depth of fill is allowed all to be significantly increased, auxiliary uplift effect can also be played on the other hand when being used as foundation ditch ground stabilization.
And be positioned at outermost permeable geomembrane 3 and be packaged in net cylinder 2 radial outer wall, this permeable geomembrane 3 has tension, feature that puncture resistance performance is good, can provide good confined pressure for pile body 1; And outer permeable geomembrane 3 also has good permeable resistance mud function, its pore size can according to glutinous grain particle diameter stage number selection, and the powerful drainability guaranteeing composite web barrel structure is more lasting.
And, there will be concavo-convex at the outer wall veil cylinder 2 and permeable geomembrane 3 extruding rear pile body 1 by the soil body, significantly strengthen contact and be engaged effect, significantly can improve the coordination stress of pile body 1 and inter-pile soil.
In sum, this novel pile body is compared with the aggregate pile such as traditional broken stone pile, stuctures and properties there occurs change in essence, make it the reinforcement flexible pile becoming a kind of good integrity, stronger side can be provided to limit constraint thus significantly improve composite foundation supporting capacity, the discharging consolidation ability of this pile body is powerful and lasting, fundamentally can improve the engineering property of soft soil, significantly shortens fast sedimentation convergent cycle.
The bi-material forming net cylinder 2 and the permeable geomembrane of skin 3 also has stronger anti-aging, decay resistance, makes the engineering property of pile body more stable lasting.
Composite web cylinder drainage aggregate stake manufactured by this enforcement, compared with conventional composite ground stabilization measure, can effectively shorten reinforcing pile length, especially the remarkable in economical benefits when the stiffening basic ground of Deep Thick Soft Ground Area.
Composite web cylinder drainage aggregate stake manufactured by the present embodiment, for prototype with traditional broken stone pile, use for reference and merge soil engineering bag sand loading stone mar and set up to go along with sb. to guard him and realize opening one's minds of draining with drainage tubular pile, go measure of going along with sb. to guard him intensity and the drainability of managing lifting pellet pile body, reduce enforcement difficulty and the measure cost of pile body, both deficiencies are made up, and advantage is strengthened.
The above is only better case study on implementation of the present invention, not does any pro forma restriction to structure of the present invention.Every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical scheme of the present invention.
Claims (6)
1. a novel deep soft soil foundation reinforcing pile construction, it is characterized in that, it comprises the following steps:
1) set construction hole at reservation construction location, and retaining wall process is carried out to construction hole;
2) composite web cylinder is made: composite web cylinder is the through column structure of axis that inner layer net cylinder and outer permeable geomembrane are formed, and the external diameter of composite web cylinder is less than construction hole internal diameter, and the height of composite web cylinder is consistent with construction hole height;
3) by step 2) the complete sinking of composite web cylinder made is placed in construction hole;
4) preprepared particulate material is injected in composite web cylinder from composite web nozzle, and make filler closely knit, the stake of composite web cylinder drainage aggregate can be formed.
2. one according to claim 1 novel deep soft soil foundation reinforcing pile construction, is characterized in that: step 1) in, take the construction technology of the vibration sinking tube compacted pore-forming do not fetched earth to set construction hole; Correspondingly, step 4) in, pellet is filled in after in composite web cylinder completely, immersed tube pulls out, immersed tube pulls out vibration in process filler can be made closely knit, after immersed tube is extracted, implement the construction of next root composite web cylinder drainage aggregate stake.
3. one according to claim 2 novel deep soft soil foundation reinforcing pile construction, is characterized in that, step 2) in, composite web cylinder is prefabricated subsection formula composite web cylinder; Correspondingly, step 3) in, prefabricated sectional type composite web cylinder is thrown in section by section in construction hole, until be sink at the bottom of hole, in work progress, is spliced by band between adjacent segment net cylinder.
4. the novel deep soft soil foundation reinforcing pile of one according to claim 3, it is characterized in that: described band comprises pricks bar and fore shaft, one side of described bundle bar is provided with multiple pawl be arranged side by side, described fore shaft is arranged on pricks bar one end, described fore shaft can carry out single-way moving on described bundle bar, and locks.
5. one according to claim 2 novel deep soft soil foundation reinforcing pile construction, it is characterized in that, step 2) in, the preparation method of composite web cylinder is: be attached on jacket casing pipe by the internal layer mesh sheet that outside has permeable geomembrane, revoling tube, directly be rolled into axially through net barrel structure, radial direction one side of mesh sheet is laminated on mesh sheet another side radial, makes the Mosaic face part superposition of mesh sheet; Correspondingly, step 3) in, while net cylinder rolls, by the composite web cylinder made to sinking in construction hole, until the whole complete sinking of net cylinder completed is in construction hole.
6. one according to claim 1 novel deep soft soil foundation reinforcing pile construction, it is characterized in that: step 4) the composite web cylinder drainage aggregate stake made radially divides three layers of layout, comprises internal layer pile body, middle level net cylinder and the permeable geomembrane of skin respectively; The material of described internal layer pile body is pellet, and described net cylinder is that the mesh sheet that modified polyethylene material or modified polypropylene material are made surrounds, and described net cylinder is wrapped in described pile body radial outer wall, and described permeable geomembrane is packaged in described net cylinder radial outer wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510888226.4A CN105544502A (en) | 2015-12-04 | 2015-12-04 | Novel construction method of strengthening pile for deep soft soil foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510888226.4A CN105544502A (en) | 2015-12-04 | 2015-12-04 | Novel construction method of strengthening pile for deep soft soil foundation |
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| CN201510888226.4A Pending CN105544502A (en) | 2015-12-04 | 2015-12-04 | Novel construction method of strengthening pile for deep soft soil foundation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106013095A (en) * | 2016-06-14 | 2016-10-12 | 宫能和 | Pile-forming method of netty tubular structure pile |
| CN108661038A (en) * | 2018-06-20 | 2018-10-16 | 西南交通大学 | A kind of three-dimensional geogrid composite earthwork cloth encapsulation steel slag pile and its construction method |
| WO2019218666A1 (en) * | 2018-05-18 | 2019-11-21 | 山东交通学院 | Anti-clogging strengthened water-permeable pile and construction method |
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| 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 |
| CN104652407A (en) * | 2015-01-05 | 2015-05-27 | 同济大学 | Folding type geotechnical-synthetic-material irregular-shaped granular pile with hoop reinforcements and construction method thereof |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005146609A (en) * | 2003-11-13 | 2005-06-09 | Okutama Kogyo Co Ltd | Ground improving method |
| CN101476315A (en) * | 2009-01-16 | 2009-07-08 | 陕西长嘉实业发展有限公司 | Method for processing soft foundation by net bag method |
| CN201610256U (en) * | 2010-03-09 | 2010-10-20 | 杨光 | Binding belt |
| 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 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106013095A (en) * | 2016-06-14 | 2016-10-12 | 宫能和 | Pile-forming method of netty tubular structure pile |
| WO2019218666A1 (en) * | 2018-05-18 | 2019-11-21 | 山东交通学院 | Anti-clogging strengthened water-permeable pile and construction method |
| CN108661038A (en) * | 2018-06-20 | 2018-10-16 | 西南交通大学 | A kind of three-dimensional geogrid composite earthwork cloth encapsulation steel slag pile and its construction method |
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