CN104652407B - A kind of band stirrup collapsible geosynthetics abnormity granular pile and construction method thereof - Google Patents
A kind of band stirrup collapsible geosynthetics abnormity granular pile and construction method thereof Download PDFInfo
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- CN104652407B CN104652407B CN201510001429.7A CN201510001429A CN104652407B CN 104652407 B CN104652407 B CN 104652407B CN 201510001429 A CN201510001429 A CN 201510001429A CN 104652407 B CN104652407 B CN 104652407B
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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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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Abstract
The present invention relates to a kind of band stirrup collapsible geosynthetics abnormity granular pile and construction method thereof, belong to Soft Soil Subgrade Treatment Techniques field.It is to be made up of the discrete material layer within vertical reinforced formula geosynthetic layer, circular stirrups and filling prose style free from parallelism stake holes with stirrup collapsible geosynthetics abnormity granular pile, use iron wire that circular stirrups is equidistantly horizontally fixed on inside vertical reinforced formula geosynthetic layer along prose style free from parallelism stake holes vertical direction, the internal filling discrete material layer of vertical reinforced formula geosynthetic layer, through closely knit formation band stirrup collapsible geosynthetics abnormity granular pile.Compared with prior art, the present invention can make full use of the frictional force between pile body and the soil body, it is provided that radial constraint, effectively reduce sedimentation, hence it is evident that improve the bearing capacity of composite foundation, carry and easy construction, having prefabricated property, construction costs is relatively low, adapts to industrial production demand.
Description
Technical field
The invention belongs to field of civil engineering, especially relate to Soft Soil Subgrade Treatment Techniques field, be specifically related to a kind of band stirrup collapsible geosynthetics abnormity granular pile and construction method thereof.
Background technology
China's soft soil foundation is of a great variety, widely distributed, the most just has the features such as moisture content high, compressibility is big, intensity is low, bad hydraulic permeability.Often there are the engineering problems such as total settlement is excessive, relative settlement obvious, posterior settlement amount exceeds standard, Lack of support in the building being built on soft soil foundation, affects normal usage energy and the security performance of building.To this, for improving the bearing capacity of soft soil foundation, having emerged in large numbers substantial amounts of soft foundation processing technology both at home and abroad, wherein composite foundation reinforcing method is the most universal.
A kind of more satisfactory Soft Ground mode of composite foundation stabilization method, originate from the sixties in 20th century, owing to this method can significantly improve the bearing capacity of ground, reduce settlement of foundation, and effectively suppression foundation soil body lateral deformation, the most all it is used widely.Broken stone pile is the one in treatment process of composite foundation, and it is to use method pore-formings in soft soil foundation such as vibration, impact or water punching, then by rubble press-in hole, is formed by the closely knit pile body of gravelly major diameter.Gravel pile reinforcing method is developed in 1936 by German engineer S.Steuerman, development through many decades, broken stone pile is widely used in all kinds of highway on soft ground engineering, it both can improve foundation bearing capacity, reduce decrement, other measures such as sand bedding course can also be coordinated to accelerate the consolidation settlement speed of soft soil foundation, thus reach the purpose of consolidated subsoil.
Although broken stone pile is a kind of stake commonly used in composite foundation stabilization, but its defect is to be vulnerable to destroy.Broken stone pile needs soil around pile to its lateral spacing to ensure intensity and the bearing capacity of pile body, when lateral spacing deficiency, easily there is tympanites or overall shear failure in pile body (particularly pile body near stake top) under pile top load effect, wherein bloating destruction is modal form.The reason bloating destruction is under upper load effect, and radial deformation can occur in the range of certain depth near stake top, deformed senior general cause pile bearing capacity to be substantially reduced thus cause lost efficacy.Broken stone pile works needs certain radial constraint, if foundation soil strength too low (it is generally acknowledged Undrained shear strength Cu < 20kPa), broken stone pile cannot be provided to play the radial constraint needed for enough effects, thus reduce integrated carrying ability.A kind of concrete core broken stone pile (ZL:200610037621.2) of Zhao Wei Ping invention, i.e. use Prefabricated Concrete stake as the stake core of broken stone pile, bear vertical load and be passed to lower sleeping hard stratum, but this method not can solve rubble radial deformation problems of too；A kind of dual radial mesh cage broken stone pile (ZL:201020603436.7) of Wang's centre halfback's invention, in the stake side of broken stone pile, sidewise restraint cylinder mould is set, to improve broken stone pile bearing capacity and to reduce sedimentation, but it has a problem in that the frictional force not making full use of between pile body and the soil body, and construction technology is the most numerous and diverse, construction quality is difficult to control to.
In sum, the method currently with Treating soft foundation applying for macadam pile there is also certain limitation at aspects such as bearing capacity and quality control on construction guarantees；To this end, the technical scheme that the present invention proposes can make full use of the frictional force between pile body and the soil body, significantly improve the bearing capacity of broken stone pile, promote the treatment effect of soft soil foundation, produce good economic benefit.
Summary of the invention
The purpose of the present invention is that and solves the technological deficiency that prior art medium stone stake exists, it is provided that a kind of band stirrup collapsible geosynthetics abnormity granular pile and process the construction method of soft base.
For realizing above-mentioned technical purpose, present invention employs techniques below solution:
The band stirrup collapsible geosynthetics abnormity granular pile that the present invention proposes, described abnormity granular pile is placed in soft soil foundation 7, the top of described abnormity granular pile is positioned at earth's surface, by prose style free from parallelism stake holes 2, vertical reinforced formula geotechnique's layer of cloth 3, circular stirrups 4, iron wire 5 and prose style free from parallelism packing layer 6 are constituted, vertical reinforced formula geotechnique's layer of cloth 3 is positioned in prose style free from parallelism stake holes 2, circular stirrups 4 is fixed on the inner side of vertical reinforced formula geotechnique's layer of cloth 3 by iron wire 5 along the prose style free from parallelism stake holes 2 equidistant level of vertical direction, some pieces vertically it are separated into by 4 vertical reinforced formula geotechnique's layer of cloths 3 of circular stirrups, discrete material 6 is filled in vertical reinforced formula geotechnique's layer of cloth 3, band stirrup collapsible geosynthetics abnormity granular pile is ultimately formed through closely knit.
In the present invention, described prose style free from parallelism stake holes 2 is cylindrical prose style free from parallelism stake holes；Described discrete material 6 is rubble or sand, and wherein ballast grain sizes is not more than 6cm, the easy-to-use medium coarse sand of sand, it is also possible to gravelly sand.
In the present invention, described vertical reinforced formula geotechnique's layer of cloth 3 uses has any one in tensile strength and the GSZ of water penetration, geotextiles, geotechnical fabric bag or geotechnique's bag；Caliber and the height of vertical reinforced formula geotechnique's layer of cloth 3 are consistent with the diameter of prose style free from parallelism stake holes 2 and height size, and its underpart is carried out sealing colligation by iron wire 5.
In the present invention, described circular stirrups 4 is the inner side using iron wire to be equidistantly horizontally fixed on vertical reinforced formula geotechnique's layer of cloth 3 along prose style free from parallelism stake holes 2 vertical direction, and the spacing between fixing point is taken as the size of prose style free from parallelism stake holes 2 diameter；When the diameter of prose style free from parallelism stake holes 2 is less than or equal to 800mm, circular stirrups 4 diameter is selected not to be preferably less than 6mm；When the diameter of prose style free from parallelism stake holes 2 is more than 800mm, selecting circular stirrups 4 diameter not to be preferably less than 8mm.
The construction method of a kind of band stirrup collapsible geosynthetics abnormity granular pile that the present invention proposes, the construction method used is immersed tube soil compaction method or the sleeve pipe compacting process of remaining silent, and Specific construction step is as follows:
One, remain silent immersed tube soil compaction method
1) vibration sinking tube pore-forming
Use vibration type piling machine, after immersed tube machinery is in place, vibration hammer vibration sinking tube is started after the earth's surface 1 of soft soil foundation 7 utilizes hammer weight and pile pipe deadweight by immersed tube slowly press-in 1-2m, often sinking 0.5-1m vibration staying 5-10s, until projected depth, in soft soil foundation 7, at this moment define a cylindrical shape underground prose style free from parallelism stake holes 2.
2) vertical reinforced formula geotechnique's layer of cloth 3 is installed
Vertical reinforced formula geotechnique's layer of cloth 3 is fixed circular stirrups 4 by iron wire 5, in vertical reinforced formula geotechnique's layer of cloth 3, it is placed in advance in appropriate discrete material 6, discrete material 6, circular stirrups 4 and vertical reinforced formula geotechnique is utilized to synthesize the Gravitative Loads of layer 3, automatically sink to the bottom of cylindrical shape underground prose style free from parallelism stake holes 2, complete the installation of vertical reinforced formula geotechnique's layer of cloth 3.
3) construction forms band stirrup collapsible geosynthetics abnormity granular pile
By the hopper on vibration type piling machine, discrete material 6 is bet in cylindrical shape underground prose style free from parallelism stake holes 2, when the rubble height in prose style free from parallelism stake holes 2 is more than the 1/3 of prose style free from parallelism stake holes 2 height, pull out immersed tube on can, should first vibrate 5-10s before tube drawing, shake while pull out, often degree of lifting 0.5m-1.0m failure of oscillation, so repeatedly until full pipe is extracted, through the closely knit band stirrup collapsible geosynthetics abnormity granular pile that ultimately forms, thus form compound foundation.
Two, sleeve pipe compacting process
1) ramming pipe pore-forming
Use steam pile driver or diesel pile driver, after pile pipe is the most in place, hammering inner and outer tubes on the earth's surface 1 of soft soil foundation 7, sink to the degree of depth of regulation, in soft soil foundation 7, at this moment define a cylindrical shape underground prose style free from parallelism stake holes 2.
2) vertical reinforced formula geotechnique's layer of cloth 3 is installed
Vertical reinforced formula geotechnique's layer of cloth 3 is fixed circular stirrups 4 by iron wire 5, pull up inner tube, in vertical reinforced formula geotechnique's layer of cloth 3, it is placed in advance in appropriate discrete material 6, discrete material 6, circular stirrups 4 and vertical reinforced formula geotechnique is utilized to synthesize the Gravitative Loads of layer 3, automatically sink to the bottom of cylindrical shape underground prose style free from parallelism stake holes 2, complete the installation of vertical reinforced formula geotechnique's layer of cloth 3.
3) construction forms band stirrup collapsible geosynthetics abnormity granular pile
After the installation of vertical reinforced formula geotechnique's layer of cloth 3, discrete material 6 is filled in cylindrical shape underground rubble hole 2, put down inner tube to the discrete material 6 in outer tube, pull up outer tube to concordant with inner tube, discrete material is compacted by hammering inner and outer tubes, pulls up inner tube and irrigates discrete material 6 in outer tube, repeats said process, until pile pipe extracts ground, ultimately form band stirrup collapsible geosynthetics abnormity granular pile in fact through hitting.
The working mechanism of the present invention:
After band stirrup collapsible geosynthetics granular pile squeezed into by soft soil foundation, form a kind of composite foundation, when the pressure that composite foundation is applied by building or other factors, vertical reinforced formula geosynthetic layer and stirrup provide radial constraint jointly, big due to the deformation ratio stirrup at vertical geosynthetic layer, the formation of the special-shaped granular pile of similar sugarcoated haws on a stick string data can be caused, which increase the contact area between pile body and the soil body, thus increase the frictional force between pile body and the soil body, improve pile body bearing capacity, promote the total bearing capacity of soft soil foundation further.
Compared with prior art, the present invention has a following Advantageous Effects:
1, due to the fact that the Gravitative Loads utilizing appropriate discrete material, circular stirrups and vertical reinforced formula geotechnique to synthesize layer, automatically sink to the bottom of cylindrical shape underground prose style free from parallelism stake holes, install the most simple and convenient than general Reinforced Gravel Pile.
2, (being fixed circular stirrups by iron wire) vertical reinforced formula geotechnique of the present invention synthesizes layer and can be folded into round pie, saves space, carries more convenient.
3, the special-shaped granular pile in the present invention increases the contact area between pile body and the soil body, thus increases the frictional force between pile body and the soil body, improves pile body bearing capacity, promotes the total bearing capacity of soft soil foundation further.
4, the present invention only increases the expense of stirrup material in construction investment, and cost performance is higher, and construction technology is simple, is convenient to process and mount, and adapts to industrial production demand.
Accompanying drawing explanation
Fig. 1 is a kind of band stirrup collapsible geotextiles abnormity broken stone pile floor map；
Fig. 2 is a kind of band stirrup collapsible geotextiles abnormity broken stone pile elevational schematic view；
Label in figure: 1-earth's surface, 2-prose style free from parallelism stake holes, 3-vertical reinforced formula geotechnique's layer of cloth, 4-circular stirrups, 5-iron wire, 6-discrete material, 7-soft soil foundation.
Detailed description of the invention
Referring to accompanying drawing, in conjunction with being embodied as case row, the present invention is described in detail.
Embodiment
1
One, band stirrup collapsible geosynthetics abnormity granular pile
As shown in Figure 1, 2, it is placed in the underground prose style free from parallelism stake holes 2 of soft soil foundation 7, it is made up of prose style free from parallelism stake holes 2, vertical reinforced formula geotechnique's layer of cloth 3, circular stirrups 4, iron wire 5 and discrete material 6,5 circular stirrups 4 of iron wire are used equidistantly to be horizontally fixed on inside vertical reinforced formula geotechnique's layer of cloth 3 along prose style free from parallelism stake holes 2 vertical direction, vertical reinforced formula geotechnique's layer of cloth 3 is positioned in prose style free from parallelism stake holes 2, fill prose style free from parallelism packing layer 6 in vertical reinforced formula geotechnique's layer of cloth 3, ultimately form band stirrup collapsible geotextiles abnormity broken stone pile through closely knit.
In the present embodiment, prose style free from parallelism stake holes 2 is cylindrical prose style free from parallelism stake holes, and diameter is taken as 800mm；The prose style free from parallelism packing layer 6 used is to take the prose style free from parallelism packing layer that particle diameter is not more than 6cm.
In the present embodiment, caliber and the height of vertical reinforced formula geotechnique's layer of cloth 3 are consistent with the diameter of prose style free from parallelism stake holes 2 and height size, and its underpart is carried out sealing colligation by iron wire 5.
Circular stirrups 4 in the present embodiment is the inner side using iron wire 5 to be equidistantly horizontally fixed on vertical reinforced formula geotechnique's layer of cloth 3 along prose style free from parallelism stake holes 2 vertical direction, and the spacing between fixing point is taken as the size of prose style free from parallelism stake holes 2 diameter；Select the circular stirrups of diameter 6mm；
The construction method utilizing band stirrup collapsible geotextiles abnormity Treating soft foundation applying for macadam pile uses sleeve pipe compacting process, and Specific construction step is as follows, such as Fig. 1, shown in 2:
1) ramming pipe pore-forming
Use steam pile driver or diesel pile driver, after pile pipe is the most in place, hammering inner and outer tubes on the earth's surface 1 of soft soil foundation 7, sink to the degree of depth (10m) of regulation, in soft soil foundation 7, at this moment define a cylindrical shape underground prose style free from parallelism stake holes 2.
2) vertical reinforced formula geotechnique layer of cloth 3(is installed and is fixed circular stirrups 4 by iron wire 5)
Pull up inner tube, in vertical reinforced formula geotechnique's layer of cloth 3, it is placed in advance in appropriate prose style free from parallelism packing layer 6, utilize prose style free from parallelism packing layer 6, circular stirrups 4 and the Gravitative Loads of vertical reinforced formula geotechnique's layer of cloth 3, automatically sink to the bottom of cylindrical shape underground prose style free from parallelism stake holes 2, complete the installation of vertical reinforced formula geotechnique's layer of cloth 3.
3) construction forms band stirrup collapsible geotextiles abnormity broken stone pile
After the installation of vertical reinforced formula geotechnique's layer of cloth 3, prose style free from parallelism packing layer 6 is filled in cylindrical shape underground rubble hole 2, put down inner tube to the prose style free from parallelism packing layer 6 in outer tube, pulling up outer tube to concordant with inner tube ground, prose style free from parallelism packing layer 6 is compacted by hammering inner and outer tubes, pulls up inner tube and irrigates prose style free from parallelism packing layer 6 in outer tube, repeat said process, until pile pipe extracts ground, through hitting the real band stirrup collapsible geotextiles abnormity broken stone pile that ultimately forms, thus form compound foundation.
The relevant technology contents do not addressed in aforesaid way is taked or uses for reference prior art to realize.
It should be noted that under the teaching of this specification those skilled in the art can with make such or as be easily varied mode, such as equivalent way, or substantially mode of texturing.Above-mentioned variation pattern all should be within protection domain of the present utility model.
Claims (4)
- null1. a band stirrup collapsible geosynthetics abnormity granular pile，It is characterized in that，Described abnormity granular pile is placed in soft soil foundation (7)，The top of described abnormity granular pile is positioned at earth's surface (1) place，By prose style free from parallelism stake holes (2)、Vertical reinforced formula geotechnique's layer of cloth (3)、Circular stirrups (4)、Iron wire (5) and discrete material (6) are constituted，Vertical reinforced formula geotechnique's layer of cloth (3) is positioned in prose style free from parallelism stake holes (2)，Circular stirrups (4) is fixed on the inner side of vertical reinforced formula geotechnique's layer of cloth (3) by iron wire (5) along the equidistant level of prose style free from parallelism stake holes (2) vertical direction，By circular stirrups (4), vertical reinforced formula geotechnique's layer of cloth (3) is vertically separated into some pieces，Discrete material (6) is filled in vertical reinforced formula geotechnique's layer of cloth (3)，Band stirrup collapsible geosynthetics abnormity granular pile is ultimately formed through closely knit；Wherein: described circular stirrups (4) is to use iron wire to be equidistantly horizontally fixed on the inner side of vertical reinforced formula geotechnique's layer of cloth (3) along prose style free from parallelism stake holes (2) vertical direction, and the spacing between fixing point is taken as the size of prose style free from parallelism stake holes (2) diameter；When the diameter of prose style free from parallelism stake holes (2) is less than or equal to 800mm, select circular stirrups diameter more than 6mm；When the diameter of prose style free from parallelism stake holes (2) is more than 800mm, select circular stirrups (4) diameter more than 8mm；Described prose style free from parallelism stake holes (2) is cylindrical prose style free from parallelism stake holes.
- A kind of band stirrup collapsible geosynthetics abnormity granular pile the most according to claim 1, it is characterised in that: described vertical reinforced formula geotechnique's layer of cloth (3) uses has any one in tensile strength and the GSZ of water penetration, geotextiles, geotechnical fabric bag or geotechnique's bag；Caliber and the height of vertical reinforced formula geotechnique's layer of cloth (3) are consistent with the diameter of prose style free from parallelism stake holes (2) and height size, and its underpart is carried out sealing colligation by iron wire (5).
- A kind of band stirrup collapsible geosynthetics abnormity granular pile the most according to claim 1, it is characterised in that: described discrete material (6) is rubble or sand, and ballast grain sizes is less than 6cm, sand medium coarse sand described in discrete material or gravelly sand.
- 4. the construction method of a kind of band stirrup as claimed in claim 1 collapsible geosynthetics abnormity granular pile, it is characterised in that: the construction method used is immersed tube soil compaction method or the sleeve pipe compacting process of remaining silent, and construction procedure is as follows:One, remain silent immersed tube soil compaction method1) vibration sinking tube pore-formingUse vibration type piling machine, after immersed tube machinery is in place, vibration hammer vibration sinking tube is started after the earth's surface (1) of soft soil foundation (7) utilizes hammer weight and immersed tube deadweight by immersed tube slowly press-in 1-2m, often sinking 0.5-1m vibration staying 5-10s, until projected depth, in soft soil foundation (7), at this moment define cylindrical shape underground prose style free from parallelism stake holes (2)；2) vertical reinforced formula geotechnique's layer of cloth (3) is installedVertical reinforced formula geotechnique's layer of cloth (3) is fixed circular stirrups (4) by iron wire (5), in vertical reinforced formula geotechnique's layer of cloth (3), it is placed in advance in appropriate discrete material, discrete material, circular stirrups (4) and vertical reinforced formula geotechnique is utilized to synthesize the Gravitative Loads of layer (3), automatically sink to the bottom of cylindrical shape underground prose style free from parallelism stake holes (2), complete the installation of vertical reinforced formula geotechnique's layer of cloth (3)；3) construction forms band stirrup collapsible geosynthetics abnormity granular pileBy the hopper on vibration type piling machine, discrete material is bet in cylindrical shape underground prose style free from parallelism stake holes (2), when the rubble height in prose style free from parallelism stake holes (2) is more than the 1/3 of prose style free from parallelism stake holes (2) height, pull out immersed tube on can, should first vibrate 5-10s before pulling out immersed tube, shake while pull out, often degree of lifting 0.5m-1.0m failure of oscillation, so repeatedly until full pipe is extracted, through the closely knit band stirrup collapsible geosynthetics abnormity granular pile that ultimately forms, thus form compound foundation；Two, sleeve pipe compacting process1) ramming pipe pore-formingUse steam pile driver or diesel pile driver, after pile pipe is the most in place, the upper hammering inner and outer tubes in earth's surface (1) in soft soil foundation (7), sink to the degree of depth of regulation, in soft soil foundation (7), at this moment define cylindrical shape underground prose style free from parallelism stake holes (2)；2) vertical reinforced formula geotechnique's layer of cloth (3) is installedVertical reinforced formula geotechnique's layer of cloth (3) is fixed circular stirrups (4) by iron wire (5), pull up inner tube, in vertical reinforced formula geotechnique's layer of cloth (3), it is placed in advance in appropriate discrete material, discrete material, circular stirrups (4) and vertical reinforced formula geotechnique is utilized to synthesize the Gravitative Loads of layer (3), automatically sink to the bottom of cylindrical shape underground prose style free from parallelism stake holes (2), complete the installation of vertical reinforced formula geotechnique's layer of cloth (3)；3) construction forms band stirrup collapsible geosynthetics abnormity granular pileAfter the installation of vertical reinforced formula geotechnique's layer of cloth (3), discrete material is filled in cylindrical shape underground prose style free from parallelism stake holes (2), put down inner tube to the discrete material face in outer tube, pulling up outer tube to concordant with inner tube, discrete material is compacted by hammering inner and outer tubes, pulls up inner tube and irrigates discrete material in outer tube, repeat said process, until pile pipe extracts ground, through hitting the real band stirrup collapsible geosynthetics abnormity granular pile that ultimately forms, thus form compound foundation.
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| DE10133122A1 (en) * | 2001-07-07 | 2003-01-23 | Keller Grundbau Gmbh | Process for the manufacture of darning pillars for soil improvement |
| CN200946265Y (en) * | 2006-06-26 | 2007-09-12 | 河海大学 | Vertical tube type grating reinforced stone column |
| CN100467723C (en) * | 2006-07-25 | 2009-03-11 | 兰州理工大学 | Method for reinforcing dispersive materials pile |
| CN101392527B (en) * | 2008-10-21 | 2010-10-06 | 冯守中 | Method for processing soft foundation by earthwork fabric granular pile |
| CN202099795U (en) * | 2011-05-23 | 2012-01-04 | 中铁二院工程集团有限责任公司 | Crushed stone pile for reinforcing extremely soft soil foundation |
| CN202124854U (en) * | 2011-06-14 | 2012-01-25 | 华侨大学 | Grid-type gravel pile |
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