CN209603123U - A kind of bottom-enlarging filling pile structure for cutting down negative friction - Google Patents
A kind of bottom-enlarging filling pile structure for cutting down negative friction Download PDFInfo
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- CN209603123U CN209603123U CN201822099258.8U CN201822099258U CN209603123U CN 209603123 U CN209603123 U CN 209603123U CN 201822099258 U CN201822099258 U CN 201822099258U CN 209603123 U CN209603123 U CN 209603123U
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Abstract
A kind of bottom-enlarging filling pile structure for cutting down negative friction is related to a kind of filling pile structure that can cut down negative frictional resistance, the Special soils stratum pile foundation engineering field such as belongs to civil engineering weak soil, bankets.It includes the steel pipe in stake holes and stake holes, steel pipe is arranged more than stake neutral point, its key technology is in neutral point position, the diameter of steel pipe is gradually increased to consistent with stake holes diameter, so that bored concrete pile lower section stake diameter is greater than bored concrete pile upper section stake diameter, places steel reinforcement cage in steel pipe, in pouring concrete within steel pipe, it is negative frictional resistance section more than neutral point, the outer wall of steel pipe setting separation layer of negative frictional resistance section disappears negative frictional resistance, fills obturator in the cavity between outer wall of steel pipe and stake holes.The utility model has the beneficial effect that using being successively placed in pile body muscle material and thin-wall steel tube after preexisting hole, then carry out concreting, compared with traditional bored concrete pile, it reduces and is directly contacted between the negative frictional resistance section pile body in top and soil around pile, to farthest cut down the negative friction of stake.
Description
Technical field
The utility model relates to one kind can cut down the filling pile structure of negative frictional resistance, the spies such as belong to civil engineering weak soil, banket
Different property soil layer pile foundation engineering field.
Background technique
In recent years, with the fast development of economic society, land resource is increasingly rare, effectively to solve in urbanization process
Land resource problem in short supply, land development and utilization moves towards three-dimensional by planarization, and is increasingly turned to underground space development.
Due to the complicated multiplicity of geological structure, in engineering construction, we are likely to be encountered various weak soils at any time, banket etc. distinguishingly
Layer, the usual low bearing capacity in this kind of stratum, settling amount are big, have a thixotropy, collapsibility, dilatancy, the not skilled worker such as frost heave
Cheng Xingzhi.When building building on such stratum, it usually needs load is reached depth using with the pile foundation compared with high-bearing capacity
Portion's soil layer or rock stratum.But when pile body passes through soft stratum, for some reason, pile soil horizon deflection is often caused to be greater than stake
Body deflection, i.e. generation negative friction, pile foundation negative friction force are an extremely complex problems, and the concept of pile foundation negative friction force is earliest
It is to be proposed in 1948 by Terzaghi and Peck, has followed up in Bjerrum in 1965 and 1969 etc. and penetrated 43m soft clay
It is implanted into calc-schist, the test achievement of the steel pipe end-bearing pile of long 55m, diameter 0.47m finds downdrag caused by negative friction
Up to 4MN drags sedimentation under pile foundation and reaches 100mm, and maximum axle power has been more than the structural strength of piling in stake, and stake terminal spine enters rock stratum
In, and be crushed；Negative friction harm is big to have some idea of.
Summary of the invention
Problem to be solved in the utility model is sunk after providing one kind aiming above insufficient and can significantly cutting down work
The enlarged footing filling pile structure of the negative friction generated drops.Its technical solution is as follows:
It includes the steel pipe in stake holes and stake holes, and steel pipe is arranged more than stake neutral point, and key technology is in neutral point
Position, the diameter of steel pipe are gradually increased to consistent with stake holes diameter, so that bored concrete pile lower section stake diameter is greater than bored concrete pile upper section stake diameter,
It is negative frictional resistance section, the outer wall of steel pipe of negative frictional resistance section more than neutral point that steel reinforcement cage is placed in steel pipe in pouring concrete within steel pipe
Setting separation layer disappears negative frictional resistance, and obturator is filled in the cavity between outer wall of steel pipe and stake holes.
Position at positive negative friction transformation, does not generate the sectional position of relative displacement between Huo Zhezhuan, soil, referred to as neutral
Point.
For some reason, Pile side soil body deflection is possible to equal with the displacement of pile body in a certain depth, herein
Pile side friction be zero；And more than this depth, Pile side soil deflection is greater than the displacement of pile body, and pile side friction is negative；In
Hereinafter, Pile side soil deflection is less than the displacement of pile body, pile side friction is positive this depth.
Compared with prior art, the utility model has the beneficial effect that
1, the utility model uses rotary drilling machinery pore-forming, and construction efficiency is high, and hole quality is easy to guarantee.
2, the utility model then carries out concrete and pours using pile body muscle material and thin-wall steel tube is successively placed in after preexisting hole
It builds, compared with traditional bored concrete pile, reduces and directly contacted between the negative frictional resistance section pile body in top and soil around pile, thus utmostly
The negative friction of stake is cut down in ground.
3, the utility model stake end enters preferable stratum certain depth, and carries out concreting in this section of tunneling boring, fills
The good physico-mechanical properties in rock stratum have been waved in distribution, are substantially increased the bearing capacity of stake, are reduced the settling amount of operation phase.
4, more than the utility model pile body neutral point concreting has only been carried out in thin-wall steel tube, it is anti-meeting structure
While pressure request, reduces the dosage of concrete material, reduce engineering cost.
5, centering bracket is set on the utility model thin-wall steel tube, can effectively ensure that the verticality in pile body decentralization process,
Guarantee that pile body is placed in stake holes between two parties, to guarantee pile body uniform force.
6, the utility model thin-wall steel tube peripheral hardware separation layer plays control efficiency for the abatement of negative friction.
7, it is backfilled between the utility model stake holes and separation layer using with the close medium of soil around pile, guarantees the stabilization of stake
Property.
Detailed description of the invention
Fig. 1 is the utility model structure diagram.
Specific embodiment
Referring to Fig. 1, the utility model includes stake holes 1, steel reinforcement cage 6 and concrete in steel pipe 2 and steel pipe 2 in stake holes
9, key technology is that the diameter of 8 or more steel pipe 2 of neutral point is less than stake diameter, so that bored concrete pile lower section stake diameter is greater than bored concrete pile upper section
Stake diameter, steel pipe 2 is interior to place steel reinforcement cage 6, and plugging bag 7 is arranged in the concrete perfusion 9 in steel pipe 2 outside 8 position steel pipe of neutral point,
Obturator 5 is filled in cavity between outer wall of steel pipe and stake holes.
The stake holes 1 is greater than the diameter of steel pipe 2, sets centering bracket 4 on steel pipe 2.
2 outer wall of steel pipe of 8 or more the neutral point pastes separation layer 3, and waterproof roll or pitching can be used in separation layer 3.
Concrete perfusion 9 in 8 or less the stake holes 1 of neutral point.
Obturator 5 is filled in cavity between the stake holes 1 and steel pipe 2 of 8 or more the neutral point.
The steel pipe 2 uses thin-wall steel tube.
The construction method of the utility model is as follows:
1, pilot hole: pressing design requirement pore-creating, using rotary drilling machinery pore-forming, in case of preferably collapse hole stratum can under long cylinder-wall protecting；
2, steel pipe is placed: after the completion of pilot hole, setting separation layer 3 on 2 surface of steel pipe, and centering bracket 4 is installed, and and steel
Pipe 2 is fixed, and steel pipe 2 is put into stake holes 1；It is gradually increased in the diameter of bored concrete pile lower section steel pipe to consistent with stake holes diameter, makes
It obtains bored concrete pile lower section stake diameter and is greater than bored concrete pile upper section stake diameter, plugging bag 7 is arranged in the outer wall of steel pipe in 8 position of neutral point；
3, the steel reinforcement cage 6 made lifting is put into steel pipe 2, until it is sent to projected depth, it is whole to keep placed in the middle；
4, casting concrete: after being put in place, to carrying out tunneling boring casting concrete 9 in steel pipe 2 and below neutral point；
5, it bankets after: after 9 initial set of concrete, by the outer slicing and filling obturator 5 between stake holes 1 of steel pipe 2.
Claims (5)
1. a kind of bottom-enlarging filling pile structure for cutting down negative friction, including the steel pipe (2) and steel pipe (2) in stake holes (1), stake holes
Interior steel reinforcement cage (6) and concrete (9), it is characterized in that the diameter of neutral point (8) the above steel pipe (2) is less than stake diameter, so that perfusion
Stake lower section stake diameter is greater than bored concrete pile upper section stake diameter, places steel reinforcement cage (6) in steel pipe (2), in steel pipe (2) interior concrete perfusion (9),
Plugging bag (7) are set outside steel pipe in neutral point (8) position, fill obturator (5) in the cavity between outer wall of steel pipe and stake holes.
2. a kind of bottom-enlarging filling pile structure for cutting down negative friction according to claim 1, it is characterised in that stake holes (1) is greater than
The diameter of steel pipe (2) sets centering bracket (4) on steel pipe (2).
3. according to claim 1 it is a kind of cut down negative friction bottom-enlarging filling pile structure, it is characterised in that neutral point (8) with
On steel pipe (2) outer wall paste separation layer (3), separation layer (3) use waterproof roll or pitching.
4. according to claim 1 it is a kind of cut down negative friction bottom-enlarging filling pile structure, it is characterised in that neutral point (8) with
The interior concrete perfusion of lower stake holes (1) (9).
5. according to claim 1 it is a kind of cut down negative friction bottom-enlarging filling pile structure, it is characterised in that neutral point (8) with
On stake holes (1) and steel pipe (2) between cavity in fill obturator (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822099258.8U CN209603123U (en) | 2018-12-13 | 2018-12-13 | A kind of bottom-enlarging filling pile structure for cutting down negative friction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822099258.8U CN209603123U (en) | 2018-12-13 | 2018-12-13 | A kind of bottom-enlarging filling pile structure for cutting down negative friction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209603123U true CN209603123U (en) | 2019-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822099258.8U Active CN209603123U (en) | 2018-12-13 | 2018-12-13 | A kind of bottom-enlarging filling pile structure for cutting down negative friction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359823A (en) * | 2020-11-17 | 2021-02-12 | 毛志鹏 | Combined foundation pile composed of steel pipe pile and cement soil pile |
-
2018
- 2018-12-13 CN CN201822099258.8U patent/CN209603123U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359823A (en) * | 2020-11-17 | 2021-02-12 | 毛志鹏 | Combined foundation pile composed of steel pipe pile and cement soil pile |
| CN112359823B (en) * | 2020-11-17 | 2022-03-11 | 毛志鹏 | Combined foundation pile composed of steel pipe pile and cement soil pile |
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