CN102628269A - Technical device for reducing negative frictional resistance on driven cast-in-place pile, and application method thereof - Google Patents
Technical device for reducing negative frictional resistance on driven cast-in-place pile, and application method thereof Download PDFInfo
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Abstract
The invention relates to a technical device for reducing negative frictional resistance on a driven cast-in-place pile, and an application method thereof. The device is characterized in that a dual-layer steel sleeve is arranged outside of a pile mould, the inner sleeve and the outer sleeve are connected by using a holder and are fixed below a vibratory hammer, and a cylindrical dual-layer plastic thin film is arranged between the inner sleeve and the outer sleeve and is fixed on an annular prefabricated concrete block by using a buckle arranged on ends of the thin film, wherein the annular prefabricated concrete block is arranged on the lower portion of the dual-layer steel sleeve. According to the invention, the dual-layer steel sleeve along with the plastic thin film within the dual-layer steel sleeve and the annular prefabricated block is sunk to a predesigned depth in static pressure or vibration manner, the steel sleeve is pulled out of the ground after concrete poured by the driven cast-in-place pile has a certain strength, while the dual-layer plastic thin film and the annular prefabricated block are left in the foundation, so that frictional factor of a pile-soil interface above the neutral point of the pile body is reduced, damages caused by the negative frictional resistance on the pile foundation are eliminated, bearing capacity of the pile foundation is improved, at the same time forming quality on the upper portion of the pile body is controlled. The device has a convenient implementation, low cost, and good pile-forming assistance effect.
Description
Technical field
The invention belongs to Soft Ground and pile foundation technical field, particularly a kind of technique device and method for using thereof that reduces the tube-sinking cast-in-situ pile negative friction.
Background technology
Pile foundation is handled in the soft soil foundation, and when factors such as meeting water owing to ground preloading, groundwater table decreasing and collapsible loess caused soil body sedimentation greater than pile body settlement, stake side soil produced downward negative friction to pile body.The generation of negative friction not only can not contribute for bearing upper load; To produce on the contrary and act on pile body and the downdrag identical with the load direction; Possibly cause a series of problems such as surrender or destruction, pile body destruction, superstructure thing differential settlement of pile end groundwork, bring serious hidden danger for engineering structures safety.The depth of interaction of negative friction has certain limit, and promptly whole pile body has only neutral point just to receive negative friction with top, and the concrete degree of depth of neutral point is relevant with factors such as pile peripheral earth character, bearing stratum character and pile top load sizes.
At present; Reducing foundation pile negative friction method commonly used is pile body bituminous coating method; Promptly in the above scope of prefabricated pile body neutral point, be coated with the thick pitch of one deck 5 ~ 10 mm; But this method can only be used for preformed pile, and also inapplicable for the tube-sinking cast-in-situ pile of extensive use in Soft Ground engineerings such as speedway, high-speed railway, there is certain pollution in bitumastic paint to underground water environment simultaneously.Before the present invention; " a kind of device of eliminating pile foundation negative friction force " (patent No.: ZL 201020517004.4) and " a kind of device that prevents negative friction " (patent No.: ZL 200920156095.0) announced the method that relief arrangements such as sleeve pipe are set between prefabricated pile body and surrounding soil; Eliminate the negative friction that is loaded into pile body through relief arrangement; Though this method can reduce negative friction to a certain extent, construction cost and construction costs are higher relatively; " the threaded plastic bushing of surface portion smooth part that is used in situ concrete pile " (patent No.: ZL 200720035479.8) announced a kind of half smooth, half-thread plastic bushing method that is used in situ concrete pile; This plastic bushing difficulty of processing is bigger, and under unguarded situation in plastic bushing directly concreting cause the damage of sleeve pipe easily.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective, eliminate the harm that pile foundation negative friction force brought, improve bearing capacity of pile foundation, control the forming quality on pile body top simultaneously, propose a kind of technique device and method for using thereof that reduces the tube-sinking cast-in-situ pile negative friction.
A kind of technique device that reduces the tube-sinking cast-in-situ pile negative friction is characterized in that: the clad steel sleeve pipe is set outside the stake mould, and interior steel sleeve is connected through clamper with the outer steel sleeve pipe and is fixed in below the vibrating hammer; In clad steel sleeve pipe bottom annular concrete precast body embedded, reinforcing bar with hook is set; The tubular double-plastic places between the inside and outside steel sleeve, and is fixed on the hook-shaped reinforcing bar of annular precast body through the latch closure on the film.
Space in described between steel sleeve and the stake mould is 0 ~ 1 cm, and the spacing of interior steel sleeve and outer steel sleeve pipe is 2 ~ 5 cm.Described inside and outside steel sleeve equal in length, and greater than the Depth of Neutral that designs in advance.
Described outer steel sleeve tube-surface indicates scale, the depth of drive of control clad steel sleeve pipe.
There is wedge angle described annular concrete precast body lower end, and the upper end can be embedded in clad steel sleeve pipe bottom, is symmetrical set 6 hook-shaped reinforcing bars on it.
Described latch closure is located at the end of tubular double-plastic.
Said device can be used for tube-sinking cast-in-situ pile and reduces pile-side negative friction; Concrete grammar is: after the stake mould sinks to the soil body; Adopt the mode of static pressure or vibration to sink to the degree of depth of design in advance together with the plastic sheeting of the inside and annular concrete precast body the clad steel sleeve pipe; After treating that concrete that tube-sinking cast-in-situ pile is built reaches certain intensity; Again steel sleeve is extracted ground, tubular double-plastic and annular concrete precast body then can be stayed in the ground because of lateral earth pressure, thereby eliminate the harm that pile foundation negative friction force brought.Use it in the immersed tube bored pile driving construction, concrete technical step is:
(1) smooth place, pile-forming machine perching, the flapper pile tip align piles position that will be connected with the stake mould utilizes stake machine and the deadweight of stake mould, vertically is pressed into a stake point in the ground, and in stake mould cavity, injects a certain amount of concrete and get in the mould to avoid silt etc.
(2) Vibration on Start-up machine sinks in the soil vibration of stake mould to projected depth.
(3) the annular concrete precast body is enclosed within outside the mould; Tubular double-plastic one end is fastened or is hooked in through latch closure on the hook-shaped reinforcing bar of annular precast body; The other end is drawn in the clad steel sleeve pipe through rope auxiliary and is kept straight; Clad steel is overlapped effective clamper connection fix, put the top and the embedding of annular precast body.
(4) clamper is fixed in the vibrating hammer below; Open vibrating hammer; Adopt the mode of static pressure or vibration to sink in the soil together with the plastic sheeting and the annular concrete precast body of the inside the clad steel sleeve pipe, and control depth of drive through the scale that the outer tube surface is indicated.
(5) treat that the clad steel sleeve pipe sinks in advance the degree of depth of design after, take off vibrating hammer and clamper, in stake mould cavity, inject concrete through charging aperture.
(6) after inserts is filled, Vibration on Start-up machine and hoist engine once more, on one side vibration, the mould of pile pulling on one side in the tube drawing process, should be added inserts, to satisfy the requirement of groundwater increment in immersed tube.
(7) treat that a mould is extracted ground, after the concrete of being built reaches certain intensity, once more interior pipe be connected through clamper with outer tube and be fixed in the vibrating hammer below, open vibrating hammer, the clad steel sleeve pipe is upwards extracted.
(8) tubular double-plastic and annular concrete precast body are stayed in the ground because of lateral earth pressure, in the slit in the double-plastic outside, inject proper amount of bentone mud to strengthen lubricant effect.
Advantage of the present invention and effect are: through in the tube-sinking cast-in-situ pile outside, the above depth bounds of neutral point, squeezing into the tubular double-plastic; Thereby reduce the friction factor at the above Pile Soil of pile body neutral point interface, the unfavorable factor of effectively eliminating pile foundation negative friction force and being brought; Through the annular concrete precast body is set; Effectively solve the problem that rewinds of plastic sheeting when pulling out on the steel sleeve; And the annular concrete precast body is stayed on the neutral point position, makes full use of the carrying effect of soil layer in the pile body scope, further improves bearing capacity of pile foundation; Optimize consolidation effect, steel sleeve can also be controlled the forming quality on pile body top simultaneously.This technique device is implemented convenient, and is with low cost, and auxiliary pile-forming effect is good.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the partial enlarged drawing of A among Fig. 1;
Fig. 3 is a vertical view of the present invention;
Among the figure, 1 is vibrating hammer, and 2 is clamper, and 3 is the outer steel sleeve pipe, and 4 is the tubular double-plastic, and 5 is interior steel sleeve, and 6 is hook-shaped reinforcing bar, and 7 is the annular concrete precast body, and 8 is the stake mould, and 9 is flapper pile tip, and 10 is latch closure.
Fig. 4 is used for the step sketch map of immersed tube bored pile driving construction for apparatus of the present invention, and wherein (1) is the pile vibrosinking mould, and (2) are that a stake mould immersed tube is accomplished; Bilayer sleeve etc. devices is in place, and (3) for being pressed into device such as bilayer sleeve, (4) are for taking off vibrating hammer and clamper; (5) be the fluid concrete filler, vibration, tube drawing form castinplace pile, and the pile body cast is accomplished for vibration pipe-drawing in (6); (7) extract bilayer sleeve for vibration, bentonite slurry is suitably injected in (8), final pile.
The specific embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.Protection scope of the present invention is not limited to by the description of this embodiment, but limits with the scope of claim.
A kind of technique device that reduces the tube-sinking cast-in-situ pile negative friction shown in Fig. 1 ~ 3, is provided with the clad steel sleeve pipe outside stake mould 8, interior steel sleeve 5 is connected through clamper 2 with the outer steel sleeve pipe 3 that indicates scale and is fixed in vibrating hammer 1 below; Annular concrete precast body 7 embedded, reinforcing bar 6 with hook is set in clad steel sleeve pipe bottom; Tubular double-plastic 4 places between the inside and outside steel sleeve, and is fixed on the hook-shaped reinforcing bar 6 of annular precast body 7 through the latch closure on the film 10.
A kind of method for using that reduces tube-sinking cast-in-situ pile negative friction technique device; Shown in Fig. 4 (1), the smooth place of elder generation, pile-forming machine perching; The flapper pile tip 9 align piles positions that will be connected with stake mould 8; Utilize stake machine and the deadweight of stake mould, vertically be pressed into a stake point in the ground, and in stake mould cavity, inject a certain amount of concrete and get in the mould to avoid silt etc.; Shown in Fig. 4 (2); The Vibration on Start-up machine sinks in the soil stake mould 8 vibration to projected depth, and annular concrete precast body 7 is enclosed within outside the mould; Tubular double-plastic 4 one ends are fastened or are hooked on the hook-shaped reinforcing bar 6 of annular precast body through latch closure 10; The other end is drawn in the clad steel sleeve pipe through rope auxiliary and is kept straight, clad steel is overlapped effective clamper 2 connect fixingly, puts the top of annular precast body and embeds; Shown in Fig. 4 (3); Clamper 2 is fixed in vibrating hammer 1 below; Open vibrating hammer, adopt the mode of static pressure or vibration to sink in the soil together with the plastic sheeting 4 of the inside with annular concrete precast body 7 the clad steel sleeve pipe, and control depth of drive through the scale that outer tube 3 surfaces are indicated; Shown in Fig. 4 (4), treat that the clad steel sleeve pipe sinks in advance the degree of depth of design after, take off vibrating hammer 1 and clamper 2; Shown in Fig. 4 (5), in stake mould 8 cavitys, inject concrete through charging aperture, after inserts is filled; Vibration on Start-up machine and hoist engine once more, on one side vibration, the mould of pile pulling on one side; In the tube drawing process, should in immersed tube, add inserts, to satisfy the requirement of groundwater increment; Shown in Fig. 4 (6), the stake mould is extracted ground, waits for that the concrete of being built reaches certain intensity; Shown in Fig. 4 (7), once more interior pipe 5 is connected through clamper 2 with outer tube 3 and is fixed in vibrating hammer 1 below, open vibrating hammer, the clad steel sleeve pipe is upwards extracted; Shown in Fig. 4 (8); Tubular double-plastic 4 is stayed in the ground because of lateral earth pressure with annular concrete precast body 7; In the slit in the double-plastic outside, inject proper amount of bentone mud to strengthen lubricant effect, finally in the tube-sinking cast-in-situ pile outside, the above depth bounds of neutral point, form tubular double-layer plastic barrier film.
Claims (6)
1. technique device that reduces the tube-sinking cast-in-situ pile negative friction is characterized in that: the clad steel sleeve pipe is set outside the stake mould, and interior steel sleeve is connected through clamper with the outer steel sleeve pipe and is fixed in the vibrating hammer below; In clad steel sleeve pipe bottom annular concrete precast body embedded, reinforcing bar with hook is set; The tubular double-plastic places between the inside and outside steel sleeve, and is fixed on the hook-shaped reinforcing bar of annular precast body through the latch closure on the film.
2. device according to claim 1 is characterized in that: the space in described between steel sleeve and the stake mould is 0 ~ 1 cm, and the spacing of interior steel sleeve and outer steel sleeve pipe is 2 ~ 5 cm; Described inside and outside steel sleeve equal in length, and greater than the Depth of Neutral that designs in advance.
3. device according to claim 1 is characterized in that: described outer steel sleeve tube-surface indicates scale, the depth of drive of control clad steel sleeve pipe.
4. device according to claim 1 is characterized in that: there is wedge angle described annular concrete precast body lower end, and the upper end is embedded in clad steel sleeve pipe bottom, is symmetrical set 6 hook-shaped reinforcing bars on it.
5. device according to claim 1 is characterized in that: described latch closure is located at the end of tubular double-plastic.
6. a kind of method for using that reduces tube-sinking cast-in-situ pile negative friction technique device according to claim 1, concrete technical step is:
(1) smooth place, pile-forming machine perching, the flapper pile tip align piles position that will be connected with the stake mould utilizes stake machine and the deadweight of stake mould, vertically is pressed into a stake point in the ground, and in stake mould cavity, injects a certain amount of concrete and get in the mould to avoid silt etc.;
(2) Vibration on Start-up machine sinks in the soil vibration of stake mould to projected depth;
(3) the annular concrete precast body is enclosed within outside the mould; Tubular double-plastic one end is fastened or is hooked in through latch closure on the hook-shaped reinforcing bar of annular precast body; The other end is drawn in the clad steel sleeve pipe through rope auxiliary and is kept straight; Clad steel is overlapped effective clamper connection fix, put the top and the embedding of annular precast body;
(4) clamper is fixed in the vibrating hammer below; Open vibrating hammer; Adopt the mode of static pressure or vibration to sink in the soil together with the plastic sheeting and the annular concrete precast body of the inside the clad steel sleeve pipe, and control depth of drive through the scale that the outer tube surface is indicated;
(5) treat that the clad steel sleeve pipe sinks in advance the degree of depth of design after, take off vibrating hammer and clamper, in stake mould cavity, inject concrete through charging aperture;
(6) after inserts is filled, Vibration on Start-up machine and hoist engine once more, on one side vibration, the mould of pile pulling on one side in the tube drawing process, should be added inserts, to satisfy the requirement of groundwater increment in immersed tube;
(7) treat that a mould is extracted ground, after the concrete of being built reaches certain intensity, once more interior pipe be connected through clamper with outer tube and be fixed in the vibrating hammer below, open vibrating hammer, the clad steel sleeve pipe is upwards extracted;
(8) tubular double-plastic and annular concrete precast body are stayed in the ground because of lateral earth pressure, in the slit in the double-plastic outside, inject proper amount of bentone mud to strengthen lubricant effect.
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| CN201210130282.8A CN102628269B (en) | 2012-04-27 | 2012-04-27 | Technical device for reducing negative frictional resistance on driven cast-in-place pile, and application method thereof |
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Cited By (11)
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| CN103081763A (en) * | 2013-02-17 | 2013-05-08 | 张永忠 | Machine for inserting plastic film perpendicularly |
| 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 |
| CN104563147A (en) * | 2014-08-29 | 2015-04-29 | 上海市政工程设计研究总院（集团）有限公司 | Composite structure pile foundation applied to karst area and construction method of composite structure pile foundation |
| CN104988913A (en) * | 2015-05-29 | 2015-10-21 | 王继忠 | Construction method for carrier pile of major diameter long pile |
| CN108277801A (en) * | 2018-01-25 | 2018-07-13 | 武汉大学 | A kind of device and method of abatement prefabricated tubular pile negative friction |
| CN108517862A (en) * | 2018-03-26 | 2018-09-11 | 中冶天工集团有限公司 | A kind of construction method of side felting |
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| CN110700245A (en) * | 2019-11-26 | 2020-01-17 | 江西思绮建筑劳务有限公司 | Construction method of cast-in-place pile |
| CN112302004A (en) * | 2020-11-11 | 2021-02-02 | 辽宁工程技术大学 | Cast-in-place pile with upper straight rod and lower expanded-base structure for reducing negative frictional resistance and construction method thereof |
| CN113513019A (en) * | 2021-09-02 | 2021-10-19 | 中建八局第二建设有限公司 | Double pile casing for pile foundation detection and use method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103081763A (en) * | 2013-02-17 | 2013-05-08 | 张永忠 | Machine for inserting plastic film perpendicularly |
| CN103081763B (en) * | 2013-02-17 | 2014-04-02 | 张永忠 | Machine for inserting plastic film perpendicularly |
| 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 |
| CN104563147A (en) * | 2014-08-29 | 2015-04-29 | 上海市政工程设计研究总院（集团）有限公司 | Composite structure pile foundation applied to karst area and construction method of composite structure pile foundation |
| CN104988913A (en) * | 2015-05-29 | 2015-10-21 | 王继忠 | Construction method for carrier pile of major diameter long pile |
| CN108277801A (en) * | 2018-01-25 | 2018-07-13 | 武汉大学 | A kind of device and method of abatement prefabricated tubular pile negative friction |
| CN108517862A (en) * | 2018-03-26 | 2018-09-11 | 中冶天工集团有限公司 | A kind of construction method of side felting |
| CN109914403A (en) * | 2019-02-22 | 2019-06-21 | 中国电力科学研究院有限公司 | It is a kind of to reduce the cast-in-place pile casing for promoting resistance |
| CN110700245A (en) * | 2019-11-26 | 2020-01-17 | 江西思绮建筑劳务有限公司 | Construction method of cast-in-place pile |
| CN112302004A (en) * | 2020-11-11 | 2021-02-02 | 辽宁工程技术大学 | Cast-in-place pile with upper straight rod and lower expanded-base structure for reducing negative frictional resistance and construction method thereof |
| CN113513019A (en) * | 2021-09-02 | 2021-10-19 | 中建八局第二建设有限公司 | Double pile casing for pile foundation detection and use method thereof |
| CN114922172A (en) * | 2022-07-01 | 2022-08-19 | 江苏东南特种技术工程有限公司 | Anchor rod pile device capable of eliminating negative frictional resistance of collapsible loess and construction method |
| CN114922172B (en) * | 2022-07-01 | 2023-12-26 | 江苏东南特种技术工程有限公司 | Anchor rod pile device capable of eliminating negative frictional resistance of collapsible loess and construction method |
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