CN103967005B - A kind of NEW TYPE OF COMPOSITE friction pile regional with highlight lines suitable for High aititude - Google Patents
A kind of NEW TYPE OF COMPOSITE friction pile regional with highlight lines suitable for High aititude Download PDFInfo
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- CN103967005B CN103967005B CN201410146934.6A CN201410146934A CN103967005B CN 103967005 B CN103967005 B CN 103967005B CN 201410146934 A CN201410146934 A CN 201410146934A CN 103967005 B CN103967005 B CN 103967005B
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Abstract
It is a kind of suitable for High aititude and the NEW TYPE OF COMPOSITE friction pile in highlight lines area, by stake core, stake cylinder, and be arranged on the outer annular injecting cement paste in hole around stake cylinder, being formed using fracture grouting mode and constitute, stake cylinder is closely pasted onto on the outside of a core.Stake core is made up of precast prestressed stake, Grouting Pipe and the center Grouting Pipe that cross section is regular hexagon；Groove is provided with the axial direction on each side of precast prestressed stake, Grouting Pipe is placed in groove, precast prestressed stake is provided with center injected hole along central axis, center Grouting Pipe is placed in the injected hole of center.Stake cylinder is made up of multistory reinforced cage and injecting cement paste；Innermost layer steel reinforcement cage and stake core tight, outermost layer steel reinforcement cage are close to hole wall, and remaining each layer is uniformly distributed；Multistory reinforced cage is wrapped up by injecting cement paste.The outer annular injecting cement paste of mesopore of the present invention is bonded as entirety with stake core, stake cylinder, and slip casting Rock And Soil, and anti-skid body is constituted together, increased the loaded area of stake, there is provided anti-skid power higher.
Description
Technical field
The invention belongs to technical field of civil engineering, it is related to a kind of suitable for High aititude, the high slope branch in highlight lines area
The NEW TYPE OF COMPOSITE friction pile of shield.
Background technology
In order to the economic development for accelerating Tibetan area exchanges fusion with nationality, the expressway construction that enters into Tibet is very urgent and necessary
's.Southwestern China and the juncture area of Tibetan area, are located in the east side of Qinghai-Tibet Platean, and landforms are characterized with high mountain gorge, slope Gao Gushen,
Landform is steep；Rarefaction of air, ecological environment frailty, and there is the influence of frost zone；And, active fault is more, earthquake
Take place frequently and earthquake magnitude is high, earthquake intensity is big, such as Diexi Earthquake（1933）And Wenchuan earthquake（2008）.Therefore, its landform, geological conditions, gas
Wait extremely complex with ecological condition, severe.
When highway is built, earth excavation is can hardly be avoided, and this causes disturbance to existing ecological environment, stratum, if do not taken
Special road building technology and ecological restoring method, cannot just ensure that ecological environment exempts from destruction.Therefore, the height for being carried out in this area
In standard highway process of construction, although adopt various measures and avoid the occurrence of excavation, steep cutting side high still occurs unavoidablely
, also inevitably there is tunnel side, face upward the stability problem on slope in slope.The excavation of high slope changes the flat of original geological environment
Weighing apparatus, is that the geological disasters such as avalanche, landslide create condition.
Friction pile is typically chosen to reinforce high slope.But, relative to the size of side slope, the diameter very little of pile body.
In design, the position of multiple sliding surfaces is assumed, determine least favorable sliding surface, then position and the size for calculating friction pile.Cause
This, stabilization when friction pile only can guarantee that the sliding surface that side slope is specified when occurring along design is slided.But, during slope sliding,
Its sliding surface is not necessarily consistent with the sliding surface assumed when designing.And, side slope it can also happen that the micro-slip on top layer, without
It is whole slide.Therefore, the friction pile for designing accordingly might not can guarantee that stability of slope.
The content of the invention
Potential risk present in slope stability is being solved in order to eliminate above-mentioned friction pile, can the invention provides one kind
By property it is high, be easy to construction, it is with low cost, it is adaptable to High aititude, highlight lines area high slope NEW TYPE OF COMPOSITE friction pile.In specific
Hold as follows：
A kind of NEW TYPE OF COMPOSITE friction pile regional with highlight lines suitable for High aititude, it is all with positioned at stake tin by stake core, stake cylinder
Annular injecting cement paste is constituted outside the hole enclosed and formed using fracture grouting mode, and stake cylinder is closely pasted onto a core outside.
Described stake core is made up of precast prestressed stake, Grouting Pipe and the center Grouting Pipe that cross section is regular hexagon；
Groove is provided with the axial direction on each side of precast prestressed stake, Grouting Pipe is placed in groove, precast prestressed stake is in
Heart axis is provided with center injected hole, and center Grouting Pipe is placed in the injected hole of center.
The intensity of described precast prestressed stake reaches more than 80MPa.
Described stake cylinder is made up of multistory reinforced cage and injecting cement paste；Innermost layer steel reinforcement cage and stake core tight, outermost layer
Steel reinforcement cage is close to hole wall, and remaining each layer is uniformly distributed；Multistory reinforced cage is wrapped up by injecting cement paste.
Described steel reinforcement cage be multi-layer annular, by toughness reach D grades and more than, plastic elongation reaches more than 9% reinforcing bar
It is made.
When annular injecting cement paste is applied outside hole, injected hole is beaten at 1~2m of stake holes wall, its range of grouting can be according to side slope rock
Body grade is adjusted, the deep 30~50cm of its depth ratio stake holes；Then, fracture grouting is carried out, the injecting cement paste of stake cylinder is also applied simultaneously
Make.So, stake core, stake cylinder and hole outside injecting cement paste be bonded as entirety, skid resistance is provided together.During slip casting, install close at stake holes
Seal apparatus, it is ensured that grouting pressure.All sizes above-mentioned and construction can all change with engineering practice.
In High aititude, highlight lines area, winter temperature is up to subzero 30~40 degree, and day and night temperature is big；Earthquake intensity is big,
Therefore it is required that the durability and plasticity of material will get well.Therefore, appropriate air entraining agent and early strength agent are added in concrete and slurries, is increased
Strong its durability；The hardwares such as reinforcing bar have good toughness and plasticity, and toughness will reach D grades, and plastic elongation reaches 9%
More than.Beneficial effect
The present invention increased annular injecting cement paste outside hole on the basis of existing compound friction pile, annular injecting cement paste outside hole
Entirety is bonded as with stake core, stake cylinder, and slip casting Rock And Soil, anti-skid body is constituted together, considerably increase the loaded area of stake, can
Undertake soil pressure higher, there is provided anti-skid power higher, at the same may also function as dissipation pore water pressure and enhancing stake plasticity and
Intensity is acted on.
Brief description of the drawings
Fig. 1 is the drawing in side sectional elevation of compound friction pile；
Fig. 2 is cut-away view of the compound friction pile stake along section 1-1.
Fig. 3 reinforces schematic diagram for the present invention.
In figure, 1, stake core, 2, stake cylinder, 3, the precast prestressed stake of hexagon, 4, stake cylinder steel reinforcement cage, 5, periphery Grouting Pipe, 6,
Center Grouting Pipe, 7, hole wall, 8, injecting cement paste, 9, annular injecting cement paste outside hole, 10, sliding surface, 11, compound friction pile.
Specific embodiment
To enable the above objects, features and advantages of the present invention more understandable, below in conjunction with the accompanying drawings and specific embodiment party
Formula is described in further detail to embodiments of the invention.
The embodiment is that compound friction pile is installed in high slope.Base area matter orographic condition etc., is combined setting for friction pile
A diameter of 1500mm is counted, wherein stake core circumscribed circle diameter is 800mm.
（1）Make stake core.According to stake holes diameter and geology orographic condition etc., design stake core regular hexagon it is prefabricated it is pre- should
The length of side of power stake is 0.8m, and each face is uniformly distributed a groove along axis.Groove is semicircle, its a diameter of 80~110mm,
Slip casting pipe diameter 110mm.
Precast prestressed stake is made using centrifugal molding process and autoclave.From high-strength concrete and tough
Property be D grade of reinforcing bar, the appropriate air entraining agent of addition.So as to, it is ensured that stake core can still have excellent in High aititude, highlight lines area
Mechanical characteristic and durability.
（2）The steel reinforcement cage of colligation stake cylinder.5 layers of bar-mat reinforcement are designed as between the hole wall and stake core of stake cylinder, with directly between each layer
The reinforcing bar of footpath 7mm is fixed.Innermost layer steel reinforcement cage and stake core tight, outermost layer steel reinforcement cage are close to hole wall, and remaining each layer is uniform
Distribution.
（3）Drilling.According to design drawing, drilled at design stake position, a diameter of 1500mm.
（4）Pile extension.When stake holes depth is long more than stake, can be entered using modes such as welding and stake core end mounting flanges
Row knot stake.
（5）Stake cylinder injecting cement paste is applied, and forms compound friction pile.After by colligation, the stake core of stake cylinder steel reinforcement cage is put into hole,
Slip casting is carried out in stake holes by Grouting Pipe and center Grouting Pipe, its grouting amount and grouting pressure will reach design requirement.
（6）Annular injecting cement paste is applied outside hole.When injecting cement paste outside hole is constructed, slip casting is being played at 1~2m of stake holes wall first
Hole, its range of grouting can be adjusted according to slope rock mass grade, the deep 30~50cm of its depth ratio stake holes.To all with stake in stake holes
Rock And Soil simultaneously carry out fracture grouting.
In injecting paste material, appropriate air entraining agent and early strength agent is added, it is ensured that the intensity of injecting cement paste, improve its durability.
During slip casting, seal nipple is installed at stake holes, it is ensured that grouting pressure.At the stake end of prefabricated pile, the hookup such as mounting flange.
When stake holes depth is long more than stake, knot stake can be easily carried out.
Claims (1)
1. a kind of NEW TYPE OF COMPOSITE friction pile regional with highlight lines suitable for High aititude, is combined friction pile by stake core and stake cylinder group
Into stake cylinder is closely pasted onto a core outside, is further characterized in that：It is provided with multiple using fracture grouting mode shape around stake cylinder
Into hole outside injecting cement paste；Described stake core is the precast prestressed stake of regular hexagon by cross section, Grouting Pipe and center slip casting
Pipe is constituted；Groove is provided with the axial direction on each side of precast prestressed stake, and Grouting Pipe is placed in groove, precast prestressed
Stake is provided with center injected hole along central axis, and center Grouting Pipe is placed in the injected hole of center；Described precast prestressed stake it is strong
Degree reaches more than 80MPa；Described stake cylinder is made up of multistory reinforced cage and injecting cement paste；Innermost layer steel reinforcement cage is closely wrapped with stake core
Wrap up in, outermost layer steel reinforcement cage is close to hole wall, remaining each layer is uniformly distributed；Multistory reinforced cage is wrapped up by injecting cement paste；Described steel reinforcement cage
Be multi-layer annular, by toughness reach D grades and more than, the reinforcement fabrication that plastic elongation reaches more than 9% is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410146934.6A CN103967005B (en) | 2014-04-13 | 2014-04-13 | A kind of NEW TYPE OF COMPOSITE friction pile regional with highlight lines suitable for High aititude |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410146934.6A CN103967005B (en) | 2014-04-13 | 2014-04-13 | A kind of NEW TYPE OF COMPOSITE friction pile regional with highlight lines suitable for High aititude |
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| Publication Number | Publication Date |
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| CN103967005A CN103967005A (en) | 2014-08-06 |
| CN103967005B true CN103967005B (en) | 2017-06-16 |
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| CN201410146934.6A Active CN103967005B (en) | 2014-04-13 | 2014-04-13 | A kind of NEW TYPE OF COMPOSITE friction pile regional with highlight lines suitable for High aititude |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1490467A (en) * | 2003-08-05 | 2004-04-21 | 胡柏英 | Composite friction pile structure and constructing method thereof |
| CN1793524A (en) * | 2005-12-27 | 2006-06-28 | 雷玉华 | Method for construction of large head expanding combined pile |
| CN202202326U (en) * | 2011-08-31 | 2012-04-25 | 中国建筑第二工程局有限公司 | High-strength concrete precast pipe pile splicing structure |
| CN202323970U (en) * | 2011-11-26 | 2012-07-11 | 山东大学 | Combined reinforcement system for side slope |
| JP5154338B2 (en) * | 2008-08-25 | 2013-02-27 | ジャパンパイル株式会社 | Prestressed reinforced concrete pile |
| CN203924049U (en) * | 2014-04-13 | 2014-11-05 | 北京工业大学 | A kind of NEW TYPE OF COMPOSITE antislide pile that is applicable to high height above sea level and high earthquake intensity area |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201730091U (en) * | 2010-08-05 | 2011-02-02 | 上海中技桩业股份有限公司 | Cast-in-situ pile |
-
2014
- 2014-04-13 CN CN201410146934.6A patent/CN103967005B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1490467A (en) * | 2003-08-05 | 2004-04-21 | 胡柏英 | Composite friction pile structure and constructing method thereof |
| CN1793524A (en) * | 2005-12-27 | 2006-06-28 | 雷玉华 | Method for construction of large head expanding combined pile |
| JP5154338B2 (en) * | 2008-08-25 | 2013-02-27 | ジャパンパイル株式会社 | Prestressed reinforced concrete pile |
| CN202202326U (en) * | 2011-08-31 | 2012-04-25 | 中国建筑第二工程局有限公司 | High-strength concrete precast pipe pile splicing structure |
| CN202323970U (en) * | 2011-11-26 | 2012-07-11 | 山东大学 | Combined reinforcement system for side slope |
| CN203924049U (en) * | 2014-04-13 | 2014-11-05 | 北京工业大学 | A kind of NEW TYPE OF COMPOSITE antislide pile that is applicable to high height above sea level and high earthquake intensity area |
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| CN103967005A (en) | 2014-08-06 |
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