CN201411685Y - Device for preventing negative frictional resistance - Google Patents
Device for preventing negative frictional resistance Download PDFInfo
- Publication number
- CN201411685Y CN201411685Y CN2009201560950U CN200920156095U CN201411685Y CN 201411685 Y CN201411685 Y CN 201411685Y CN 2009201560950 U CN2009201560950 U CN 2009201560950U CN 200920156095 U CN200920156095 U CN 200920156095U CN 201411685 Y CN201411685 Y CN 201411685Y
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- CN
- China
- Prior art keywords
- felts
- oil
- stake
- concrete jacket
- frictional resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a device for preventing negative frictional resistance, and the device is characterized by comprising a pile, two layers of felt and three coats of bitumastic, a concrete jacket and fine sand. The two layers of felt and three coats of bitumastic are stuck on the outer wall of the pile by 502 glue, then the outside of the two layers of felt and three coats of bitumasticis provided with the concrete jacket, and the clearance between the concrete jacket and the two layers of felt and three coats of bitumastic is filled with the fine sand. The height of the two layersof felt and three coats of bitumastic is arranged to a neutral point. The device for preventing negative frictional resistance has simple structure and convenient construction.
Description
Technical field
The utility model relates to a kind of device that prevents negative friction, is applicable to the foundation field.
Background technology
Be arranged at the stake in the ground, exist frictional resistance between stake side surface and the soil, act on a direction of side surface frictional resistance and depend on stake and the relative displacement between the foundation soil on every side.Under normal circumstances, stake top is sunk by vertical uniform load q, if the fall rate of stake is greater than the fall rate of foundation soil, foundation soil will produce the upwards frictional resistance of effect to the stake side, this power that acts on the side unit area is called positive frictional force, and it play supporting role to stake.Otherwise former thereby sink because of certain when the stake side soil body, and its rate of settling (or settling amount) promptly produces downward frictional resistance during greater than the rate of settling (or settling amount) of stake, and this power that acts on the side unit area is called the negative skin friction of pile.The negative skin friction of pile occurs in the building place that territory, weak soil, underconsolidated soil deadweight Consolidation and the underground water of piling prepressing decline by a big margin mostly.Many engineering foundations cause structure in use to cause that owing to the negative skin friction of pile increases imposed load to stake foundation settlement produces engineering problems such as crack owing to well do not consider the pile foundation negative skin friction of pile.
The utility model content
The utility model solves existing technical problem, and a kind of device that prevents negative friction is provided.
The utility model comprises stake, two felts, three oil, concrete jacket and fine sand.Two felts, three oil stick on an outer wall with 502 glue, do concrete jacket in two felts, three oil outsides then, and clog with fine sand at concrete jacket and position, two felts, three oily space.Push up to neutral point from stake two felts, three oil are set.
The utility model simple structure, easy construction.
Description of drawings
A kind of device that prevents negative friction of Fig. 1
Fig. 2 is the node schematic diagram 1.
1,2 two felts, three oil, 3 concrete jackets, 4 fine sands, 5 soil
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described in detail.
The utility model comprises stake 1, two felts three oil 2, concrete jacket 3 and fine sand 4.Two felts, three oil, 2 usefulness, 502 glue stick on stake 1 outer wall, do concrete jacket 3 in two felts, three oily 2 outsides then, and clog with fine sand 4 at concrete jacket 3 and position, two felts, three oily 2 space.Concrete jacket 3 thickness are 10～12mm, and internal diameter is convenient to operation than the big 5～7mm of stake 1 external diameter.Fillet is made in concrete jacket 3 bottoms, is convenient to stake 1 and sinks in the soil 5.Push up to neutral point from stake two felts, three oil 2 are set, neutral point is selected for use according to table 1.
Table 1 two felts three oil are provided with height
| Bearing stratum character | Cohesive soil, silt | In close above sand | Gravel, cobble |
| Height is set | 0.5～0.6 long | 0.7～0.8 long | 0.9 stake is long |
Claims (2)
1, a kind of device that prevents negative friction, its feature comprises stake, two felts, three oil, concrete jacket and fine sand, two felts, three oil stick on an outer wall with 502 glue, do concrete jacket in two felts, three oil outsides then, clog with fine sand at concrete jacket and position, two felts, three oily space, and two felts, three innage degree are arranged to neutral point.
2, according to described two felts of claim 1 three oil, it is characterized in that pushing up to neutral point two felts, three oil are set from stake, two felts, three oil are provided with height and select for use according to table 1.
Table 1 two felts three oil are provided with height
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201560950U CN201411685Y (en) | 2009-05-21 | 2009-05-21 | Device for preventing negative frictional resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201560950U CN201411685Y (en) | 2009-05-21 | 2009-05-21 | Device for preventing negative frictional resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201411685Y true CN201411685Y (en) | 2010-02-24 |
Family
ID=41713572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201560950U Expired - Fee Related CN201411685Y (en) | 2009-05-21 | 2009-05-21 | Device for preventing negative frictional resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201411685Y (en) |
Cited By (4)
| 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 |
| CN104452833A (en) * | 2014-11-28 | 2015-03-25 | 长安大学 | Method for burying mold pile |
| CN105544532A (en) * | 2016-01-20 | 2016-05-04 | 中铁二院工程集团有限责任公司 | Negative frictional resistance reduction structure of collapsibility subgrade pile foundation |
| CN105649075A (en) * | 2016-01-27 | 2016-06-08 | 太原理工大学 | Device and method for reducing negative friction of bored pile |
-
2009
- 2009-05-21 CN CN2009201560950U patent/CN201411685Y/en not_active Expired - Fee Related
Cited By (6)
| 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 |
| CN104452833A (en) * | 2014-11-28 | 2015-03-25 | 长安大学 | Method for burying mold pile |
| CN104452833B (en) * | 2014-11-28 | 2016-06-01 | 长安大学 | A kind of Model Pile method for embedding |
| CN105544532A (en) * | 2016-01-20 | 2016-05-04 | 中铁二院工程集团有限责任公司 | Negative frictional resistance reduction structure of collapsibility subgrade pile foundation |
| CN105649075A (en) * | 2016-01-27 | 2016-06-08 | 太原理工大学 | Device and method for reducing negative friction of bored pile |
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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: 20100224 Termination date: 20110521 |