CN201843136U - Device for eliminating negative skin friction of pile foundation - Google Patents
Device for eliminating negative skin friction of pile foundation Download PDFInfo
- Publication number
- CN201843136U CN201843136U CN2010205170044U CN201020517004U CN201843136U CN 201843136 U CN201843136 U CN 201843136U CN 2010205170044 U CN2010205170044 U CN 2010205170044U CN 201020517004 U CN201020517004 U CN 201020517004U CN 201843136 U CN201843136 U CN 201843136U
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- pile
- sleeve
- stake
- drag reduction
- friction reduction
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Abstract
The utility model relates to a device for eliminating negative skin friction of a pile foundation. The device comprises a friction reduction strip arranged on the pile and a sleeve sleeved outside the pile and the friction reduction strip; the sleeve is sleeved outside the pile; the friction reduction strip is fixed on the pile and above a neutral point; the sleeve comprises a sleeve wall and a friction reduction slot fixed on the inner wall surface of the sleeve wall; the outer surface of the sleeve is rough and the roughness is identical with that on the pile body below the neutral point; the included angle between the opening of the friction reduction slot and the clockwise direction of the sleeve ranges from 0 to 90 degrees; and the friction reduction strip forming an included angle of 0 to 90 degrees with the clockwise direction of the pile body is matched with the friction reduction slot in structure. The device provided by the utility model has the advantages of simple structure, convenience in manufacture, low construction difficulty and remarkable engineering effect. By adopting the device, the pile is effectively prevented from being influenced by the negative skin friction, the positive skin friction guaranteeing normal work of the pile is not lowered, further the effective bearing capacity, the stability and the security of the pile are greatly improved, both the cost for the pile and that for the foundation treatment are saved, the pile foundation construction cost is effectively reduced, and distinct economic benefits and social benefits are achieved.
Description
Technical field
The utility model relates to a kind of device of eliminating pile foundation negative friction force, relates to the preformed pile manufacturing technology of pile foundation engineering, especially relates to the manufacturing technology of anti-negative friction preformed pile, is applicable to the pile foundation of civil construction project soft foundation.
Background technology
When using pile foundation in civil construction project, deadweight is fixed because the soil around the pile body takes place, self-collapsibility or ground imposed load etc. are former thereby when producing sedimentation greater than pile body, the downward frictional resistance that soil is produced the stake side surface is also referred to as negative friction.The generation of negative friction has increased the load of stake, thereby reduced effective supporting capacity of stake, many buildings cause structure sediment because of the large tracts of land preloading produces negative friction to stake, thereby cause engineering accidents such as building inclination or structure crack, its reparation often needs to spend substantial contribution and material resources, even can't use and remove.
Eliminating at present the most widely used general also effective method of pile foundation negative friction force is pile body pitching method, but also there are many problems in pile body pitching method, such as, the factor that influences the bituminous coating effect is more, the bituminous coating performance requirement is higher, and when reducing negative friction, also subdued positive frictional resistance, influenced the normal use of stake.And other are at the improvement project of pile body pitching method, as: " equipment for eliminating negative friction of pile foundation " (CN 92103616), be provided with off-load cover and lubricated separation layer in the pile body periphery, eliminate the negative friction that is loaded into stake by this covering device, though this covering device ratio can more effectively have been eliminated negative friction by giving pile body pitching method, but yet exist the problem of when eliminating negative friction, also having subdued positive frictional resistance, also increased construction cost simultaneously.
Summary of the invention
At the existing deficiency of eliminating the pile foundation negative friction force technology, the objective of the invention is to propose a kind of simple and reasonable, make, easy to use, can effectively eliminate negative friction and do not reduce the device of the elimination pile foundation negative friction force of positive frictional resistance.
The device of the elimination pile foundation negative friction force that the utility model proposes, this device is positioned at the surface of pile body neutral point with top, form by stake 1 and sleeve pipe 2, wherein: sleeve pipe 2 is placed in outside the stake 1, stake 1 neutral point is fixed with drag reduction bar 3 with the upper part, sleeve pipe 2 is made of casing wall 4 and the drag reduction groove 5 that is fixed in casing wall 4 inner wall surface, and sleeve pipe 2 external surfaces are coarse and the part of the pile body below roughness and the neutral point is suitable; Angle between the notch of drag reduction groove 5 and sleeve pipe 2 clockwise directions is 0 °-90 °; Angle between drag reduction bar 3 and pile body clockwise direction is 0 °-90 °, is complementary with the structure of drag reduction groove 5.
In the utility model, spacing is 4～8cm between casing wall 4 inwalls of sleeve pipe 2 and stake 1 outer wall.
In the utility model, stake 1 be shaped as in square, circle or the polygon any.
In the utility model, the cross section of drag reduction bar 3 is a triangle, and the quantity of drag reduction bar 3 is determined on a case-by-case basis.Drag reduction bar 3 adopts high tenacity and high-intensity organic material to make.
When the stake of having buried, soil around the pile body or because the sedimentation that the ground imposed load produces soil during greater than the sedimentation of pile body, be the soil body has downward motion with respect to pile foundation trend, thereby sleeve pipe is produced downward negative friction, the relative pile body of sleeve pipe meeting this moment is to lower slider, because the top of the horn of drag reduction bar can produce certain flexural deformation, make sleeve pipe in the process that glides, the cell wall contact portion of the angle of drag reduction bar and drag reduction groove only produces very little frictional force, and when the dropping distance of sleeve pipe reaches the height (spacing of adjacent drag reduction groove) of a groove, the top of the horn of drag reduction bar can rebound automatically, enter engagement in the last zigzag drag reduction groove that sunk, thereby eliminated the influence of negative friction to lower slider stake by sleeve pipe.
When the stake of having buried, soil around the pile body or because the sedimentation that the ground imposed load produces soil during less than the settling amount of pile body, i.e. stake relatively soil have downward move during trend, stake sleeve pipe relatively moves downward, because the top of the horn of drag reduction bar embeds engagement in the zigzag drag reduction groove, and reverse relative with the drag reduction wall, produce the self-locking effect, make sleeve and stake relative motion again, like this, the positive frictional resistance of soil just can pass to stake by sleeve pipe.
This apparatus structure is simple, easy to make, difficulty of construction is low, the pile foundation engineering that is used for soft foundation, effect is obvious, can not subdue the positive frictional resistance that guarantees the stake operate as normal in to the influence of stake effectively having eliminated negative friction, thereby improved effective bearing capacity of stake greatly, the stability and the safety of stake have been improved, comparing with additive method when bearing identical load can be with shorter stake, thereby saved the expense of stake and the expense that ground is handled, significantly reduced the pile foundation engineering cost, had tangible economic benefit and social benefit.
Description of drawings
Fig. 1 is the utility model stake and sleeve pipe schematic diagram.
Fig. 2 is the utility model stake and drag reduction bar schematic diagram.
Fig. 3 is the utility model sleeve pipe generalized section.
Fig. 4 is the utility model stake and drag reduction bar generalized section.
Fig. 5 is the utility model stake generalized section.
Number in the figure: 1 is stake, and 2 is sleeve pipe, and 3 is the drag reduction bar, and 4 is casing wall, and 5 is the drag reduction groove.
The specific embodiment
Further specify the present invention in conjunction with the accompanying drawings below by embodiment.
Embodiment 1: the utility model device is made of with the sleeve pipes 2 that are enclosed within outside stake 1 and the drag reduction bar 3 the drag reduction bar 3 that is located in the stake 1.Stake 1 shape of cross section can be in square, circle or the polygon any.Drag reduction bar 3 adopts high tenacity and high-intensity organic material to make, and its cross section is a triangle, is fixedly installed on the surface of stake 1 neutral point with top, and the angle between drag reduction bar 3 and pile body clockwise direction is 0 °-90 °.Sleeve pipe 2 is made of casing wall 4 and the drag reduction groove 5 that is fixed in casing wall 4 inner wall surface, the casing wall 4 of sleeve pipe 2 adopts steel or highstrenghtpiston to make, the gap is 4～8cm between casing wall 4 inwalls of sleeve pipe 2 and stake 1 outer wall, be fixedly equipped with to adopt at sleeve pipe 2 casing wall inner surfaces and have the drag reduction groove 5 that high tenacity and high-intensity organic material are made, drag reduction groove 5 can be meshed with drag reduction bar 3, the length of drag reduction groove 5 and density are by the designing requirement setting, angle between the notch of drag reduction groove 5 and sleeve pipe 2 clockwise directions is 0 °-90 °, when drag reduction bar 3 meshes with drag reduction groove 5, make form between sleeve pipe 2 and the stake 1 a kind of can only unidirectional relative slip and have the structure of auto-lock function, can not reduce the positive frictional resistance of pile foundation when being implemented in effective elimination pile foundation negative friction force.
Claims (4)
1. device of eliminating pile foundation negative friction force, this device is positioned at the surface of pile body neutral point with top, form by stake (1) and sleeve pipe (2), it is characterized in that sleeve pipe (2) is placed in outside the stake (1), stake (1) neutral point is fixed with drag reduction bar (3) with the upper part, sleeve pipe (2) is made of casing wall (4) and the drag reduction groove (5) that is fixed in casing wall (4) inner wall surface, and the angle between the notch of drag reduction groove (5) and sleeve pipe (2) clockwise direction is 0 °-90 °; Angle between drag reduction bar (3) and pile body clockwise direction is 0 °-90 °, is complementary with the structure of drag reduction groove (5).
2. the device of elimination pile foundation negative friction force according to claim 1, it is characterized in that sleeve pipe (2) casing wall (4) inwall and the stake (1) outer wall between spacing be 4～8cm.
3. the device of elimination pile foundation negative friction force according to claim 1, what it is characterized in that stake (1) is shaped as in circle or the polygon any.
4. the device of elimination pile foundation negative friction force according to claim 1, the cross section that it is characterized in that drag reduction bar (3) is a triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205170044U CN201843136U (en) | 2010-09-02 | 2010-09-02 | Device for eliminating negative skin friction of pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205170044U CN201843136U (en) | 2010-09-02 | 2010-09-02 | Device for eliminating negative skin friction of pile foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201843136U true CN201843136U (en) | 2011-05-25 |
Family
ID=44038030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205170044U Expired - Fee Related CN201843136U (en) | 2010-09-02 | 2010-09-02 | Device for eliminating negative skin friction of pile foundation |
Country Status (1)
| Country | Link |
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| CN (1) | CN201843136U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628269A (en) * | 2012-04-27 | 2012-08-08 | 河海大学 | Technical device for reducing negative frictional resistance on driven cast-in-place pile, and application method thereof |
| CN104131550A (en) * | 2014-07-17 | 2014-11-05 | 河海大学 | Variable-diameter steel tube built pile capable of reducing negative friction |
| CN105220720A (en) * | 2015-10-20 | 2016-01-06 | 西安科技大学 | Building foundation, Collapsible Loess District reinforcing pile and pressing pile construction method thereof |
| CN107190762A (en) * | 2017-07-11 | 2017-09-22 | 中铁第四勘察设计院集团有限公司 | A kind of piling strtucture for reducing side friction |
| CN107386277A (en) * | 2017-07-25 | 2017-11-24 | 中建五局土木工程有限公司 | Flexible foundation pile side friction isolation structure and construction method |
| CN110158585A (en) * | 2019-05-22 | 2019-08-23 | 东南大学 | A kind of device and construction method for cutting down Soft Soil Area pile foundation negative friction force |
| CN111502336A (en) * | 2020-05-06 | 2020-08-07 | 黑龙江省建筑安装集团有限公司 | Energy-saving environment-friendly building house |
-
2010
- 2010-09-02 CN CN2010205170044U patent/CN201843136U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628269A (en) * | 2012-04-27 | 2012-08-08 | 河海大学 | Technical device for reducing negative frictional resistance on driven cast-in-place pile, and application method thereof |
| CN102628269B (en) * | 2012-04-27 | 2014-05-07 | 河海大学 | Technical device for reducing negative frictional resistance on driven cast-in-place pile, and application method thereof |
| CN104131550A (en) * | 2014-07-17 | 2014-11-05 | 河海大学 | Variable-diameter steel tube built pile capable of reducing negative friction |
| CN104131550B (en) * | 2014-07-17 | 2016-02-03 | 河海大学 | A kind of variable diameters steel pipe combination stake reducing negative friction |
| CN105220720A (en) * | 2015-10-20 | 2016-01-06 | 西安科技大学 | Building foundation, Collapsible Loess District reinforcing pile and pressing pile construction method thereof |
| CN107190762A (en) * | 2017-07-11 | 2017-09-22 | 中铁第四勘察设计院集团有限公司 | A kind of piling strtucture for reducing side friction |
| CN107386277A (en) * | 2017-07-25 | 2017-11-24 | 中建五局土木工程有限公司 | Flexible foundation pile side friction isolation structure and construction method |
| CN107386277B (en) * | 2017-07-25 | 2020-03-24 | 中建五局土木工程有限公司 | Flexible foundation pile side friction force isolation structure and construction method |
| CN110158585A (en) * | 2019-05-22 | 2019-08-23 | 东南大学 | A kind of device and construction method for cutting down Soft Soil Area pile foundation negative friction force |
| CN111502336A (en) * | 2020-05-06 | 2020-08-07 | 黑龙江省建筑安装集团有限公司 | Energy-saving environment-friendly building house |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110525 Termination date: 20130902 |