CN101525880A - Plastic sleeve concrete pile and method thereof for reinforcing soft soil foundation - Google Patents
Plastic sleeve concrete pile and method thereof for reinforcing soft soil foundation Download PDFInfo
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- CN101525880A CN101525880A CN200910024639A CN200910024639A CN101525880A CN 101525880 A CN101525880 A CN 101525880A CN 200910024639 A CN200910024639 A CN 200910024639A CN 200910024639 A CN200910024639 A CN 200910024639A CN 101525880 A CN101525880 A CN 101525880A
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Abstract
The invention relates to a plastic sleeve concrete pile and a construction method thereof. the plastic sleeve concrete pile comprises a cover board, plastic sleeves, pile tips, concrete and sleeve joints, wherein the top of each plastic sleeve is connected with the cover board and the lower part is connected with each pile tip, every two plastic sleeves are connected by the sleeve joint, and the concrete is poured in the plastic sleeves. The construction method comprises the following steps: connecting the prefabricated pile tips with the plastic sleeves, pulling the plastic sleeves together with the pile tips into an immersed tube after lifting the immersed tube at a certain height, starting a plastic sleeve concrete pile driver to drive the plastic sleeves with the pile tips together into the pile length designed depth, lifting the immersed tube after filling water into the plastic sleeves until 1/2-2/3 of pile length but remaining the plastic sleeves and the pile tips into the foundation, pumping filled water in the plastic sleeves, and pouring a concrete pile body and the cover board into the plastic sleeves to be made into the plastic sleeve concrete pile. The plastic sleeve concrete pile has small soil extrusion action, uneasy broken pile, flexible and rapid construction, easy control of pile body quality, higher bearing capacity of single pile and good cost performance; and the pouring is not influenced by outside.
Description
Technical field
The present invention relates to a kind of stake type of Foundation Design, particularly relate to a kind of method with the plastic sleeve concrete pile reinforcing soft soil foundation.
Background technology
At present, in engineerings such as speedway, high-speed railway, municipal administration, airport, stake formula embankment has become a kind of general method for processing foundation.Before the present invention invented, the embankment stake was based on rigid pile such as flexible piles such as cement mixing method and vibrator pipe sinking cast-in-place pile, pile for prestressed pipe, bored piles.Cement mixing method (comprising slurry spray stake and powder spray piling) belongs to flexible pile, strength of the mixing pile is low, cost is economized, but construction quality is wayward, it is limited and can not be used for the deeper location of soft base that conventional method is handled the degree of depth, and consolidation effect is not as the preformed pile ideal, and the number that requires to lay out pile is a lot of in that high fill location requirement for bearing capacity is high, makes that cost also can be very high.Its cost of vibration sinking tube in situ concrete pile will be less than preformed pile, but the vibration sinking tube concrete pile is because big to the influence of pile body on every side in the vibration work progress, is prone to broken pile, quality is wayward and detection difficult, quality accident is many, fullness coefficient is excessive sometimes, aspect factors such as surrounding constructure influence is big are selected for use in actual embankment engineering seldom at present.The prestressed reinforced concrete stake is because quality is very easily controlled and detected, and consolidation effect is good, quality problems such as broken pile can not occur, obtains very widespread usage at present in the deep soft foundation treatment project.But the mode that adopts this preformed pile cost often is quite expensive, and its strength of the mixing pile aspect existed very big waste when simultaneously high-intensity stake was used as the embankment stake, and the engineering operational phase strength of the mixing pile behind pile is not in full use and utilizes.The slurry bonded dispersed body material stake does not have problem such as mud skin sediment but the operating expenses height, except that mud is handled problems such as causing environment pollution, also exist rubble and be difficult for wash clean, shortcoming such as waste material, slip casting be inhomogeneous in the ground of sandstone interlayer.
Before the present invention's invention, a kind of plastic sleeve concrete pile with double-walled is used abroad to some extent, and what it used is the double-layer plastic sleeve pipe of outer wall as screw thread, inner wall smooth.Be the space of sealing between double-wall corrugated pipe two walls, the concrete of cast can not contact with outer wall, and stake soil phase mutual friction trace damages outer wall thread easily, thus influence stake and soil body frictional force; The double-wall corrugated pipe inner wall smooth, the concrete of cast can make concrete can not closely contact with plastic bushing because shrink.These defectives make plastic bushing greatly reduce the contribution of pile body bearing capacity, can not bring into play the friction interlocking between the screw thread and the soil body, and sleeve pipe is inoperative substantially during pile body work, has caused very big waste.In addition, abroad when utilizing the common PVC pipe as double-walled plastic bushing material, because pvc pipe is hard and inflexibility, the machine that sets during construction needs first immersed tube to projected depth, then sleeve pipe is sling and put into immersed tube from the immersed tube upper opening, in plastic bushing, immersed tube could be extracted behind the fluid concrete immediately again, finish pile construction.This kind method sleeve pipe sets with concreting and carries out continuously, pays particular attention to the construction that cooperatively interacts, complex procedures, and speed of application is slow.When plastic bushing adopted double-walled HDPE pipe, being characterized in can be suitably crooked, can be in advance with the sleeve pipe that connects with precast pile tip from the vertical immersed tube bottom insertion of the machine of setting and squeeze into the ground.This method sets concrete construction and sleeve pipe to separate carries out, and efficiency of construction improves, but prices are rather stiff for the HDPE material, and construction costs significantly increases.In addition, at present state the concrete pile type of plastic bushing is single in addition, employed stake point is flat steel plate, when running into hard soil layer, is difficult for passing.
The single wall screw plastic casing on-site concrete pile job practices that is adopted in the present domestic engineering: adopt all-hydraulic auxiliary vibrations intubate to set the machine construction, utilize its frame can tilt together with steel pipe, to insert with the plastic bushing that precast pile tip connects in the inclination steel pipe easily earlier, machinery is put positive frame and steel pipe then, and plastic bushing is squeezed in the ground.This method has been done many innovations improvement on the basis abroad, adopts the single wall screw pipe, makes the concrete and the sleeve pipe of cast to combine closely, and outer tube wall is survivable simultaneously, can give full play to the rubbing action between the sleeve pipe and the soil body, the raising bearing capacity.Utilize the rack inclining way, the hard sleeve of cheap PVC material also can be satisfied earlier sleeve pipe is all set finish after the job practices of fluid concrete again, improve efficiency of construction, remove this and also can utilize this to set the taper pile of multiple angles.By changing the pointed formula of stake, exploitation concrete and steel plate concrete stake point in conjunction with the auxiliary oscillating machinery of hydraulic pressure, have improved the penetration capacity in the pile works, enlarge range of application.But also there is open defect in it: the pile soil compaction effect makes plastic bushing easy deformation even destruction; Crawler type hydraulic pressure sets machine because the restriction of own wt and dynamical system, is difficult to pass through when running into hard soil layer, set comparatively difficulty, and construction depth is more shallow; Pile sinking expands empty to the very big disturbance of pile peripheral earth generation, and the pile body side friction weakens; Plastic bushing insert that immersed tube needs immersed tube or together with mechanical tilt, set upright, vertically, to medium process, this process time is longer, greatly influences speed of application, improves construction cost.
Therefore seek at present a kind of existing preformed pile quality well have again in situ concrete pile cost province, easy construction, consolidation effect good, the little domestic embankment stake type of promoting the use of that is suitable for of surrounding environment influence is seemed very important.
Summary of the invention
The object of the present invention is to provide the method for a kind of plastic sleeve concrete pile and reinforcing soft soil foundation thereof.
The objective of the invention is to realize by following technical scheme:
A kind of plastic sleeve concrete pile, it is characterized in that it is made up of cover plate 1, sleeve pipe 2, stake point 3, concrete 4 and casing joint 5, fixedly connected with cover plate 1 in the top of its middle sleeve 2, the bottom of sleeve pipe 2 is connected with stake point 3, fixedly connected with casing joint 5 between every joint sleeve pipe 2, concrete perfusion 4 in the sleeve pipe 2.
The upper lateral of described cover plate 1 is provided with 2-6 root master muscle 6, vertically be provided with 4-6 root reinforcement 7, vertically have two outstanding muscle 8 to go here and there out the cover plate end face in addition, reinforcement 7 is fixedlyed connected with main muscle 6, be placed on then in the mould of " snap-fastener " type, make or adopt reinforced concrete prefabricated forming with concreting.
The outer wall of described sleeve pipe 2 is that thread-shaped or part are smooth shape, and with 5 gluing connections of usefulness PVC cementing agent of casing joint, sleeve pipe 2 usefulness PVC materials are made between every joint sleeve pipe 2.
Described stake point 3 is a reinforced concrete structure, be conical, center upper portion is provided with the sleeve pipe plug 9 with the PVC material, and insert in the sleeve pipe plug 9 sleeve pipe 2 bottoms, with the gluing connection of cementing agent, the periphery of sleeve pipe plug 9 is provided with a spill annulus 11 or is provided with the platform 12 of a step.
The periphery of described sleeve pipe 2 can also add the fixing 2-4 of connection root Grouting Pipe 13 in addition, and this effective PVC material or steel pipe are made.
With the method for plastic sleeve concrete pile reinforcing soft soil foundation, its method step is as follows:
(1) with particular manufacturing craft precast concrete pile point 3: the reinforcing bar that the configuration of stake point is set in the steel mould, concreting is shaken close, the platform 12 of spill annulus 11 or step was set before concrete setting, lays plastic bushing plug 9, treat to take off punching block after concrete reaches dried tenacity;
(2) every joint single wall screw plastic casing 2 is connected by casing joint 5 respectively, and gluing with the PVC cementing agent, or with super glue or fixedly connected with holdfast, casing length is equated with designing pile length or omit to surpass designing pile length;
(3) single wall screw plastic casing 2 lower ends are connected with sleeve pipe plug 9 on the precast concrete pile point 3, and gluing, or fixedly connected, form the hemi-closure space of sleeve pipe 2 upper end open with super glue or holdfast with the PVC cementing agent;
(4) promote single wall screw plastic casing 2 and stake point 3 apart from ground 1.0-2.5 rice height with the plastic sleeve concrete pile machine that sets, plastic bushing 2 usefulness lifting ropes 14 that connect stake point 3 were drawn in the immersed tube from 15 ends of immersed tube, and the bottom of immersed tube 15 is inserted in the spill annulus 11 on the point or is shelved on the step platform 12;
(5) open plastic bushing coagulation scholar stake and set machine, find the stake position accurately, immersed tube 15 is squeezed into the ground design stake degree of depth in the lump together with the plastic bushing 2 of the inside band pile crown;
(6) to the design stake degree of depth, utilize water injection pipe 16 in single wall screw plastic casing 2, to carry out water filling 2 dozens of single wall screw plastic casings, annotate to the long water yield of 1/2-2/3 stake and begin to promote immersed tube 15, and plastic bushing 2 and stake point 3 are stayed in the ground, continue water filling while pulling out, plastic bushing 2 is protected;
(7) treat that branch section plastic bushing sets and finish, water in the plastic bushing 2 are pumped that unified again fluid concrete pile body and cover plate 1, and vibration compacting form the plastic sleeve concrete pile group in minute section with small pump;
(8) in the time will further improving pile side friction, other to 2 side slip castings of plastic bushing, improves all soil nature matter of stake with small-sized Grouting Pipe 13;
(9) after pile body, cover plate 1 concrete reach design strength, lay reinforcement material on cover plate 1 top, and be connected with cover plate 1, form an integral body, or lay sand-gravel cushion earlier on cover plate 1 top, reinforcement material is arranged in the sand-gravel cushion, is not connected with cover plate 1;
(10) lay sand-gravel cushion, form the plastic sleeve concrete pile composite foundation.
Inside and outside pile body sleeve pipe 2 of the present invention adopts all are single wall pvc pipes of screw thread, also can adopt other plastic bushings.Use single wall screw plastic casing, the concrete of cast can fully contact with plastic bushing 2, can not isolate because of concrete shrinkage or throw off, outer tube wall is not fragile yet like this, strengthened the contact friction force of stake, improved the bearing capacity of stake, given full play to the effect of casing threads with the soil body.Single wall screw plastic casing of the present invention can be cheap PVC material simultaneously, bending that can be suitable, set the lifting of machine immersed tube in conjunction with plastic sleeve concrete pile, set after just can having that enough spaces are convenient and utilizing rope hauling device that plastic bushing is inserted immersed tube rapidly.So make the plastic bushing that adopts cheap PVC material also can satisfy earlier plastic bushing with the outside and all set the job practices that begins concrete pouring again after finishing, promptly fluid concrete with set the plastic bushing two procedures separately, both independently construct and are independent of each other, thereby increase substantially efficiency of construction.And can only adopt PE soft material pipe such as expensive HDPE or immersed tube to tilt just can accomplish this construction technology in the past, increase a large amount of construction costs.
In addition, in order to reduce an adverse effect of top negative friction, it is that threaded sleeve, top are the modes that all smooth sleeve pipe of inside and outside wall is connected that sleeve pipe 2 can adopt the bottom, can effectively reduce top pile body negative friction.
Plastic bushing also can adopt different rings rigidity along pile body according to the difference of weak soil parameter, construction depth and cloth pile spacing, the sleeve pipe of different rings rigidity can add sealing ring with joint, the auxiliary again methods such as glue and screw that adopt are connected in case of necessity, can guarantee the quality that sets of sleeve pipe like this, can save material again, reduce cost.
Precast pile tip used in the present invention can be according to each place soil property different mining with steel sheet pile point or concrete pile point or steel plate concrete stake point, and can adopt various ways such as taper shape, X type, has enlarged range of application.At present adopt conical precast concrete pile point more, and preset on the precast pile tip can with the close-connected joint of plastic bushing, the good leak tightness after sleeve pipe is connected with stake is sharp effectively guarantees the quality that sets of sleeve pipe.
Pile cap decking can adopt prefabrication system among the present invention, also can adopt the mode of cover plate and pile concrete integrated casting construction, and shape can be circular or square.When adopting prefabricated cover plate, treat that the pile concrete cast reaches certain intensity after, cover plate is placed in the stake top, and guarantees the straight and even of cover plate, it is flexible to construct; And adopt cast-in-place cover plate, globality is better, after plastic bushing sets and finishes, the water that injects in the sleeve pipe is pumped, excavate a sizeable groove along the sleeve pipe top by the design size of cover plate, the cover plate mould is put into groove, carry out concrete pouring again, construction king-pile tip cutting muscle can be connected the back fluid concrete with two-layer reinforcing bar binding in the cover plate; The outstanding cover plate top of a reinforcing bar part maybe can be set, reinforcement material directly is layed on the cover plate, and be connected with the outstanding reinforcing bar binding of cover plate, form whole, more can bring into play the load-carrying properties of plastic sleeve concrete pile, or at cover plate top elder generation laying sand-gravel cushion, reinforcement material is arranged in the sand-gravel cushion, is not connected with cover plate.
Soil compaction effect of the present invention is little, can be because of vibration soil compaction and broken pile, and, construction little to surrounding environment influence is flexible quick, low to site requirements, pile quality is easy to check, control, and the controlled and cast of concrete amount is not subjected to ectocine, and bearing capacity of single pile is higher, have good cost performance, and applicability is strong.
Description of drawings
Fig. 1---plastic sleeve concrete pile structural representation
(a) the sleeve pipe inside and outside wall is that thread-shaped (b) top is smooth sleeve pipe, and the bottom is the thread-shaped sleeve pipe
Fig. 2---covering plate structure schematic diagram
Fig. 3---precast concrete pile point schematic diagram
(a) the sharp top of spill annulus (b) stake is arranged is the step platform on stake sharp top
Fig. 4 plastic bushing inserts the immersed tube schematic diagram
Fig. 5 plastic bushing is squeezed into the slip casting of ground rear wall
Reference numeral: the vertically outstanding muscle of 1-cover plate, 2-sleeve pipe, 3-stake point, 4-concrete, 5-sleeve pipe jointing, the horizontal main muscle of 6-, 7-lengthways main steel bar, 8-, 9-precast pile tip middle sleeve plug, the horizontal reinforcement material of 10-, 11-spill annulus, 12-step platform, 13-Grouting Pipe, 14-immersed tube (steel pipe), 15-lifting rope, 16-water injection pipe.
The specific embodiment
Embodiment 1:
Embodiment 2:
Claims (6)
1, a kind of plastic sleeve concrete pile, it is characterized in that it is made up of cover plate (1), sleeve pipe (2), stake point (3), concrete (4) and casing joint (5), fixedly connected with cover plate (1) in the top of its middle sleeve (2), the bottom of sleeve pipe (2) is connected with stake point (3), fixedly connected between every joint sleeve pipe (2) with casing joint (5), concrete perfusion (4) in the sleeve pipe (2).
2, plastic sleeve concrete pile according to claim 1, the upper lateral that it is characterized in that described cover plate (1) is provided with 2-6 root master muscle (6), vertically be provided with 4-6 root reinforcement (7), vertically there are two outstanding muscle (8) to go here and there out the cover plate end face in addition, reinforcement (7) is fixedlyed connected with main muscle (6), be placed on then in the mould of " snap-fastener " type, make or adopt reinforced concrete prefabricated forming with concreting.
3, plastic sleeve concrete pile according to claim 1, it is characterized in that described sleeve pipe (2) for inside and outside all are single wall pvc pipes of screw thread or for being the pvc pipe of smooth shape inside and outside the top employing, screw thread single wall pvc pipe is adopted in the bottom, is connected or with super glue or fixedly connected with holdfast with the PVC cementing agent is gluing with casing joint (5) between every joint sleeve pipe (2).
4, plastic sleeve concrete pile according to claim 1, it is characterized in that described stake point (3) is reinforced concrete structure, be conical, center upper portion is provided with the sleeve pipe plug (9) of using the PVC material or making of metal material, insert in the sleeve pipe plug (9) sleeve pipe (2) bottom, with the gluing connection of PVC cementing agent or with super glue or fixedly connected with holdfast, the periphery of sleeve pipe plug (9) is provided with a spill annulus (11) or is provided with the platform (12) of a step.
5, plastic sleeve concrete pile according to claim 1 is characterized in that the periphery of sleeve pipe (2) can also add the fixing 2-4 root Grouting Pipe (13) that connects in addition, and this effective PVC material or steel pipe are made.
6, a kind of job practices with the plastic sleeve concrete pile reinforcing soft soil foundation, its construction sequence is as follows:
(1) with particular manufacturing craft precast concrete pile point 3: the reinforcing bar that the configuration of stake point is set in the steel mould, concreting is shaken close, the platform 12 of spill annulus 11 or step was set before concrete setting, lays plastic bushing plug 9, treat to take off punching block after concrete reaches dried tenacity;
(2) every joint single wall screw plastic casing 2 is connected by casing joint 5 respectively, and gluing with the PVC cementing agent, or with super glue or fixedly connected with holdfast, casing length is equated with designing pile length or omit to surpass designing pile length;
(3) single wall screw plastic casing 2 lower ends are connected with sleeve pipe plug 9 on the precast concrete pile point 3, and gluing or with super glue or fixedly connected with the PVC cementing agent with holdfast, form the hemi-closure space of sleeve pipe 2 upper end open;
(4) promote immersed tube 15 with the plastic sleeve concrete pile machine that sets, apart from ground 1.0-2.5 rice height, plastic bushing 2 usefulness lifting ropes 14 that connect stake point 3 were drawn in the immersed tube from 15 ends of immersed tube, the bottom of immersed tube 15 is inserted in the spill annulus 11 of stake sharp 3 or be shelved on the step platform 12;
(5) open plastic sleeve concrete pile and set machine, find the stake position accurately, immersed tube 15 is squeezed into the ground design stake degree of depth in the lump together with the single wall screw plastic casing 2 of the inside band stake point;
(6) to the degree of depth of designing pile length, utilize water injection pipe 16 in plastics single wall screw sleeve pipe 2, to carry out water filling 2 dozens of single wall screw plastic casings, annotate to the long water yield of 1/2-2/3 stake and begin to promote immersed tube 15, and single wall screw plastic casing 2 and stake point 3 are stayed in the ground, continue water filling while pulling out, single wall screw plastic casing 2 is protected;
(7) treat that branch section plastic bushing sets and finish, water in the plastic bushing 2 are pumped that unified again fluid concrete pile body and cover plate 1, and vibration compacting form the plastic sleeve concrete pile group in minute section with small pump;
(8) in the time will further improving pile side friction, other to 2 side slip castings of plastic bushing, improves all soil nature matter of stake with small-sized Grouting Pipe 13;
(9) after pile body, cover plate 1 concrete reach design strength, lay reinforcement material on cover plate 1 top, and be connected with cover plate 1, form an integral body, or lay sand-gravel cushion earlier on cover plate 1 top, reinforcement material is arranged in the sand-gravel cushion, is not connected with cover plate 1;
(10) lay sand-gravel cushion, form the plastic sleeve concrete pile composite foundation.
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| CN102433876A (en) * | 2011-08-31 | 2012-05-02 | 浙江大学城市学院 | Multi-compartment casing composite pile and construction method thereof |
| CN102619223A (en) * | 2012-04-09 | 2012-08-01 | 浙江大学城市学院 | Binding-enhanced type rigid and soft combined pile and construction method |
| CN102061704B (en) * | 2009-11-12 | 2012-08-29 | 任再永 | Plastic pouring tube-in-tube pile |
| CN102995622A (en) * | 2012-11-14 | 2013-03-27 | 河海大学 | Casing draining end bearing pile for treating liquefied foundation and construction method |
| CN103074891A (en) * | 2013-01-29 | 2013-05-01 | 浙江信博城市建设有限公司 | Double-layer plastic sleeve bulk material and concrete stiffness core composite pile and construction method thereof |
| CN103074890A (en) * | 2013-01-29 | 2013-05-01 | 浙江华光市政建设有限公司 | Plastic sleeve and steel pipe combined cast-in-place concrete hollow pipe pile and construction method thereof |
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| CN107916665A (en) * | 2017-10-24 | 2018-04-17 | 中国建筑第七工程局有限公司 | A kind of plastic bushing pile driving construction engineering method |
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| CN101892664A (en) * | 2010-07-21 | 2010-11-24 | 东南大学 | Bored concrete pile group construction method of plastic honeycomb pipe retaining wall and honeycombed bored concrete pile |
| CN102433876A (en) * | 2011-08-31 | 2012-05-02 | 浙江大学城市学院 | Multi-compartment casing composite pile and construction method thereof |
| CN102433876B (en) * | 2011-08-31 | 2014-01-29 | 浙江大学城市学院 | Multi-compartment casing composite pile and construction method thereof |
| CN102619223A (en) * | 2012-04-09 | 2012-08-01 | 浙江大学城市学院 | Binding-enhanced type rigid and soft combined pile and construction method |
| CN102995622A (en) * | 2012-11-14 | 2013-03-27 | 河海大学 | Casing draining end bearing pile for treating liquefied foundation and construction method |
| CN103074891B (en) * | 2013-01-29 | 2015-07-15 | 浙江信博城市建设有限公司 | Double-layer plastic sleeve bulk material and concrete stiffness core composite pile and construction method thereof |
| CN103074891A (en) * | 2013-01-29 | 2013-05-01 | 浙江信博城市建设有限公司 | Double-layer plastic sleeve bulk material and concrete stiffness core composite pile and construction method thereof |
| CN103074890A (en) * | 2013-01-29 | 2013-05-01 | 浙江华光市政建设有限公司 | Plastic sleeve and steel pipe combined cast-in-place concrete hollow pipe pile and construction method thereof |
| CN103741682A (en) * | 2013-12-31 | 2014-04-23 | 江苏中瑞路桥建设有限公司 | Carbon fiber cloth bag cast-in-situ anti-arch curved surface combined irregular-shaped pile and construction method thereof |
| CN103741682B (en) * | 2013-12-31 | 2015-10-07 | 江苏中瑞路桥建设有限公司 | The construction method of a kind of carbon fiber cloth bag cast-in-place antiarch surface composition shaped pile |
| CN106661857A (en) * | 2014-08-08 | 2017-05-10 | Ugc株式会社 | Pile for constructing retaining wall on cut area caused by mountain cutting and flimsy ground susceptible to ground subsidence and method for constructing retaining wall using same |
| CN109477322A (en) * | 2016-08-29 | 2019-03-15 | 金思文 | It is used to form the casing of concrete retaining wall |
| CN107916665A (en) * | 2017-10-24 | 2018-04-17 | 中国建筑第七工程局有限公司 | A kind of plastic bushing pile driving construction engineering method |
| TWI780912B (en) * | 2021-09-15 | 2022-10-11 | 蔡景堯 | foundation pile |
| CN114197472A (en) * | 2021-12-09 | 2022-03-18 | 中煤第三建设（集团）有限责任公司 | Vibration auxiliary device for small-diameter tree root pile and using method thereof |
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