CN214194504U - Composite pile capable of reducing negative frictional resistance - Google Patents
Composite pile capable of reducing negative frictional resistance Download PDFInfo
- Publication number
- CN214194504U CN214194504U CN202023091081.0U CN202023091081U CN214194504U CN 214194504 U CN214194504 U CN 214194504U CN 202023091081 U CN202023091081 U CN 202023091081U CN 214194504 U CN214194504 U CN 214194504U
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- Prior art keywords
- pile
- frictional resistance
- sleeve
- section
- composite pile
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- 239000002131 composite material Substances 0.000 title claims abstract description 18
- 230000002787 reinforcement Effects 0.000 claims abstract description 31
- 239000004567 concrete Substances 0.000 claims abstract description 30
- 230000007935 neutral effect Effects 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 12
- 239000000440 bentonite Substances 0.000 claims description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000010426 asphalt Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 18
- 239000010959 steel Substances 0.000 abstract description 18
- 238000011065 in-situ storage Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005253 cladding Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 9
- 210000003205 muscle Anatomy 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000010412 perfusion Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
A composite pile capable of reducing negative frictional resistance. The problem of current drilling bored concrete pile be difficult to subduct negative friction when subsiding is solved. It is including filling section and concrete section, concrete section overcoat be equipped with the sleeve pipe, the section of filling include first bored concrete pile and second bored concrete pile, the cladding of second bored concrete pile live the steel reinforcement cage, the concrete section locate the top of neutral point, the steel reinforcement cage insert the sleeve intraductal and be connected with the sleeve pipe. The beneficial effects of the utility model are that, adopt the mode of composite pile, reduced the cost promptly, improved the bearing capacity of stake simultaneously and eliminated the influence of burden frictional resistance again. After the negative friction resistance is reduced, the bearing capacity of the pile foundation formed by the cast-in-situ bored pile can be effectively improved, the construction cost is saved, and the cast-in-situ bored pile has the advantages of simple structure, long service life and the like.
Description
Technical Field
The utility model relates to a in foundation pile of building engineering pile foundation, concretely relates to can subduct compound stake of burden frictional resistance.
Background
At present, foundation piles of construction engineering pile foundations can be classified into precast concrete piles, cast-in-place concrete piles, steel pipe concrete piles and the like according to pile body materials and pile forming processes. Among them, the cast-in-place concrete pile is widely used in high-rise buildings, large railways and highway bridges due to its high bearing capacity. When the settlement generated by the soil layer around the pile exceeds the settlement of the foundation pile, the negative frictional resistance of the pile side is counted when the bearing capacity of the foundation pile is calculated. The negative frictional resistance on the pile side does not contribute to the bearing of the upper load, but rather generates a downward pulling force acting on the pile side, thereby causing the effects of yielding or breaking of the pile end foundation, breaking of the pile body, uneven settlement of the structure and the like. Therefore, considering the effect of the negative frictional resistance on the pile foundation on the pile side is one of the indispensable problems in the design of the pile foundation, and in engineering practice, it is desirable to reduce the negative frictional resistance as much as possible. Although the current measures for reducing the negative friction resistance include a coating method pile sleeve protection method, a pre-drilling method and the like, the method for reducing the negative friction resistance can only be used for precast piles and cannot be used for cast-in-situ bored piles. When the upper load borne by the foundation pile is large and the precast pile cannot meet the bearing requirement, a bored pile must be adopted, the negative frictional resistance cannot be eliminated at the moment, and only the pull-down load generated by the cast-in-place pile can be applied to the cast-in-place pile, so that the bearing capacity requirement of the cast-in-place pile is further increased.
SUMMERY OF THE UTILITY MODEL
For solving the problem that current drilling bored concrete pile is difficult to subduct negative frictional resistance when subsiding among the background art, the utility model provides a can subdue negative frictional resistance's composite pile.
The technical scheme of the utility model is that: the utility model provides a can subduct compound stake of negative frictional resistance, includes filling section and concrete section, concrete section overcoat be equipped with the sleeve pipe, the filling section include first bored concrete pile and second bored concrete pile, second bored concrete pile cladding live the steel reinforcement cage, the concrete section locate the top of neutral point, the steel reinforcement cage insert the sleeve pipe in and be connected with the sleeve pipe.
As an improvement of the utility model, the outside of the sleeve is provided with a coating for reducing the negative frictional resistance.
As a further improvement of the utility model, the coating is an asphalt coating.
As a further improvement of the utility model, the diameter of the sleeve is smaller than the diameter of the perfusion section.
As a further improvement of the utility model, the outside of the sleeve is filled with a bentonite slurry layer.
As a further improvement, the reinforcement cage comprises a plurality of main reinforcements and stirrups, and the stirrups are sleeved with the main reinforcements.
As a further improvement, the stirrups have a plurality of, a plurality of stirrups all overlap the outside of locating the main muscle or all overlap the inboard of locating the main muscle or set up in the inside and outside of main muscle in turn.
As a further improvement, the utility model discloses a plurality of the equal vertical setting of main muscle, and relative second bored concrete pile center is the annular and evenly sets up.
As a further improvement of the utility model, the main rib extends upwards at the neutral point and is inserted into the sleeve and fixed with the sleeve by welding.
As a further improvement of the utility model, the main rib extends upwards by 30-80cm at the neutral point.
The beneficial effects of the utility model are that, adopt the mode of composite pile, reduced the cost promptly, improved the bearing capacity of stake simultaneously and eliminated the influence of burden frictional resistance again. After the negative friction resistance is reduced, the bearing capacity of the pile foundation formed by the cast-in-situ bored pile can be effectively improved, the construction cost is saved, and the cast-in-situ bored pile has the advantages of simple structure, long service life and the like.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is an enlarged view of the half-section at B-B in FIG. 1.
Fig. 3 is an enlarged schematic view of the structure at I in fig. 1.
In the figure, 1, the perfusion section; 11. a first cast-in-place pile; 12. a second cast-in-place pile; 13. a reinforcement cage; 131. a main rib; 132. hooping; 2. a concrete section; 21. a sleeve; 22. coating; 23. a bentonite slurry layer; A. a neutral point.
Detailed Description
The embodiments of the present invention will be further explained with reference to the accompanying drawings:
shown by fig. 1 and fig. 2-3, a compound pile capable of reducing negative frictional resistance comprises a pouring section 1 and a concrete section 2, wherein a sleeve 21 is sleeved outside the concrete section 2, the pouring section 1 comprises a first pouring pile 11 and a second pouring pile 12, the second pouring pile 12 covers a reinforcement cage 13, the concrete section 2 is arranged above a neutral point a, and the reinforcement cage 13 is inserted into the sleeve 21 and connected with the sleeve 21. The beneficial effects of the utility model are that, adopt the mode of composite pile, reduced the cost promptly, improved the bearing capacity of stake simultaneously and eliminated the influence of burden frictional resistance again. After the negative friction resistance is reduced, the bearing capacity of the pile foundation formed by the cast-in-situ bored pile can be effectively improved, the construction cost is saved, and the cast-in-situ bored pile has the advantages of simple structure, long service life and the like.
The outer side of the sleeve 21 is provided with a coating 22 for reducing negative frictional resistance. Specifically, the coating 22 is an asphalt coating. Of course, the outside of the sleeve can also be provided with a film barrier. This reduces the negative frictional resistance of the pile surface. Typically, a 1mm thick asphalt coating can be applied over the casing to reduce the frictional resistance. More specifically, the sleeve is a steel pipe.
The diameter of said sleeve 21 is smaller than the diameter of the infusion section 1. The pressure resistance of the steel pipe concrete is higher than that of the lower poured steel concrete, so that the diameter of the upper steel pipe concrete pile can be reduced, the area of the pile side is reduced, and the negative friction resistance of the pile side is further reduced.
The outside of the casing 21 is filled with a layer of bentonite slurry 23. Because the diameter of the steel pipe is slightly smaller than the drilling diameter of the cast-in-situ bored pile, a gap exists between the outer side of the steel pipe and the wall of the drilled hole, and the gap can also be filled with a bentonite slurry layer, so that the negative friction resistance is reduced.
The reinforcement cage 13 includes a plurality of main reinforcements 131 and stirrups 132, and the stirrups 132 are sleeved with the main reinforcements 131.
The stirrups 132 have a plurality ofly, a plurality of stirrups 132 all overlap the outside of locating main muscle 131 or all overlap the inboard of locating main muscle 131 or set up in the inside and outside of main muscle 131 in turn. Specifically, the main ribs 131 are vertically arranged and are uniformly arranged in a ring shape relative to the center of the second cast-in-place pile 12. The structure ensures that the performance of the pouring section is stable and can meet the bearing requirement.
The main rib 131 extends upward at the neutral point and is inserted into the sleeve 21 and fixed with the sleeve 21 by welding. Specifically, the main rib 131 extends upwards by 30-80cm at the neutral point. More specifically, the main rib 131 extends upwards by 30-50cm at the neutral point. The structure ensures that the main reinforcement of the reinforcement cage is reliably connected with the sleeve (steel pipe) and is convenient to process. The process before the steel reinforcement cage is put down is the same as that of the conventional cast-in-situ bored pile. The surface of the steel pipe is coated with a coating which can reduce the frictional resistance, such as asphalt with the thickness of 1 mm. And when the reinforcement cage is lowered, the steel pipe and the reinforcement cage are welded together. And after the steel reinforcement cage is placed to the designed position, pouring concrete to form the composite foundation pile of the lower cast-in-place pile and the upper steel pipe concrete pile. Finally, the bentonite slurry is used for filling the gap between the outer side of the gap steel pipe and the wall of the drilled hole, so that the negative friction resistance is further reduced.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The skilled person should understand that: although the present invention has been described in accordance with the above embodiments, the inventive concept is not limited to this embodiment, and any modification of the inventive concept will be included in the scope of the patent claims.
Claims (10)
1. The composite pile capable of reducing negative frictional resistance is characterized by comprising a pouring section (1) and a concrete section (2), wherein a sleeve (21) is sleeved outside the concrete section (2), the pouring section (1) comprises a first pouring pile (11) and a second pouring pile (12), the second pouring pile (12) covers a reinforcement cage (13), the concrete section (2) is arranged above a neutral point (A), and the reinforcement cage (13) is inserted into the sleeve (21) and connected with the sleeve (21).
2. A composite pile for reducing negative frictional resistance according to claim 1, wherein the outer side of the sleeve (21) is provided with a coating (22) for reducing negative frictional resistance.
3. A composite pile for reducing negative frictional resistance according to claim 2, wherein said coating (22) is an asphalt coating.
4. A composite pile for reducing negative frictional resistance according to claim 1, wherein the diameter of the casing (21) is smaller than the diameter of the pouring section (1).
5. A composite pile for reducing negative frictional resistance according to claim 3, wherein the outer side of said casing (21) is filled with a bentonite slurry layer (23).
6. A composite pile for reducing negative frictional resistance according to claim 1, wherein said reinforcement cage (13) comprises a plurality of main reinforcements (131) and stirrups (132), said main reinforcements (131) are provided, and said stirrups (132) are sleeved with said main reinforcements (131).
7. The composite pile capable of reducing the negative frictional resistance according to claim 6, wherein the stirrups (132) are provided in plurality, and the stirrups (132) are all sleeved on the outer side of the main reinforcement (131), or all sleeved on the inner side of the main reinforcement (131), or alternately arranged on the inner side and the outer side of the main reinforcement (131).
8. A composite pile for reducing negative friction according to claim 6, wherein a plurality of said main reinforcements (131) are vertically arranged and uniformly arranged in a ring shape with respect to the center of the second cast-in-place pile (12).
9. A composite pile for reducing negative friction resistance according to claim 6, wherein the main reinforcement (131) extends upwards at the neutral point and is inserted into the sleeve (21) and fixed with the sleeve (21) by welding.
10. A composite pile for reducing negative frictional resistance according to claim 6, wherein the main reinforcement (131) extends upward 30-80cm at the neutral point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023091081.0U CN214194504U (en) | 2020-12-21 | 2020-12-21 | Composite pile capable of reducing negative frictional resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023091081.0U CN214194504U (en) | 2020-12-21 | 2020-12-21 | Composite pile capable of reducing negative frictional resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214194504U true CN214194504U (en) | 2021-09-14 |
Family
ID=77654630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023091081.0U Expired - Fee Related CN214194504U (en) | 2020-12-21 | 2020-12-21 | Composite pile capable of reducing negative frictional resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214194504U (en) |
-
2020
- 2020-12-21 CN CN202023091081.0U patent/CN214194504U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210914 |