CN214245685U - Rigid-flexible composite uplift pile - Google Patents
Rigid-flexible composite uplift pile Download PDFInfo
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- CN214245685U CN214245685U CN202022772948.2U CN202022772948U CN214245685U CN 214245685 U CN214245685 U CN 214245685U CN 202022772948 U CN202022772948 U CN 202022772948U CN 214245685 U CN214245685 U CN 214245685U
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Abstract
The utility model provides a rigid-flexible composite uplift pile, which comprises a plurality of uplift pile units, wherein each uplift pile unit comprises a rigid uplift pile and a flexible pile, the number of the rigid uplift piles is 1, and the rigid uplift piles are positioned in the center; the number of the flexible piles is multiple, and the flexible piles are arranged around the rigid uplift pile; the rigid uplift pile and the flexible pile are mutually meshed, and the size of meshing is 0.15-0.2 m; adjacent flexible piles are mutually meshed, the size of meshing is not less than 0.25m, and at least two rows of flexible piles are arranged; the uplift pile units are arranged in a ring or grid mode, and the distance between the rigid uplift piles of two adjacent uplift pile units is not less than six times of the diameter of the rigid uplift pile. The utility model discloses not only reduced the disturbance to the soil body or the weak soil of easily liquefying when the rigid pile construction, still made rigid pile side frictional resistance than the rigid pile increase by a wide margin with the soil body or the weak soil direct contact department condition of easily liquefying, still increased the flexible pile side frictional resistance simultaneously.
Description
Technical Field
The utility model relates to a municipal works's technical field, more specifically relates to a compound uplift pile of rigid-flexible.
Background
In recent years, with the rapid development of urban construction, development and utilization of road traffic and underground spaces have become an inevitable trend of development. A large number of traffic structures penetrating through railways or highways downwards, such as U-shaped grooves or subway shield intervals, underground pipe galleries, underground garages and the like, are built, so that the anti-floating problem of the underground structure becomes very important. And the uplift pile is widely applied to the anti-floating design of the projects.
The main action mechanism of the uplift pile is to resist buoyancy by means of the friction force between the pile body and the surrounding soil layer and the self weight of the pile body. The standard value calculation formula of the uplift limit bearing capacity of the single pile is as follows: t isuk＝∑λiqsikuiliWherein λ isiIs the coefficient of resistance to plucking, qsikIs the standard value of the compression limit side resistance of the i-th layer soil on the surface of the pile side, uiThe circumference of the pile body is shown. In a soft soil area or an earthquake liquefaction area, when the reinforced concrete uplift pile is used alone for construction, the disturbance to the surrounding soil body is large, the standard value of the pile body side resistance is reduced more, the anti-floating effect of the uplift pile is weakened, and certain economic loss is caused.
Meanwhile, when the reinforced concrete uplift pile is used independently in an earthquake liquefied stratum and a soft soil stratum, because the underground water level is high, dewatering is needed firstly to carry out uplift pile drilling construction, but when a plurality of underground structures are close to high-speed rails or other important buildings at present, dewatering measures cannot be adopted, and then the uplift pile is difficult to form holes, and the holes are easily liquefied and collapsed or contracted in the construction process, even quicksand and local collapse are caused, and the pile forming quality of the uplift pile is influenced. Especially, the pile is formed by drilling in silt and fine sand layers below the underground water level, and the pore water pressure in the soil layer can be increased rapidly, so that a large soil squeezing effect is caused, the foundation of the adjacent building around the construction site is raised greatly, and the normal use of the adjacent building is influenced.
The application of the rigid uplift pile in the stratum is limited in economic efficiency and safety because the pile body is difficult to form a hole, the uplift force is reduced too much, the influence on the surrounding environment is large and the like when the rigid uplift pile is used alone for the easily liquefied earthquake and the soft soil stratum, particularly the soft soil with higher sensitivity.
Therefore, a technical scheme which solves the problems of soil extrusion effect, difficult hole forming, too much reduction of the pulling resistance and the like existing in the singly adopted rigid uplift pile and enables the anti-floating design to be more economical and reasonable is urgently needed in the prior art.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art, the utility model provides a hard and soft compound uplift pile.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
a rigid-flexible composite uplift pile comprises a plurality of uplift pile units, wherein each uplift pile unit comprises a rigid uplift pile and a flexible pile, the number of the rigid uplift piles is 1, and the rigid uplift piles are located in the center; the number of the flexible piles is multiple, and the flexible piles are arranged around the rigid uplift pile; the rigid uplift pile and the flexible pile are mutually meshed, and the size of meshing is 0.15-0.2 m; adjacent flexible piles are mutually meshed, the size of meshing is not less than 0.25m, and at least two rows of flexible piles are arranged; the uplift pile units are arranged in a ring or grid mode, and the distance between the rigid uplift piles of two adjacent uplift pile units is not less than six times of the diameter of the rigid uplift pile.
The section of the rigid uplift pile is circular or square.
The rigid uplift pile is a reinforced concrete drilled pile.
The diameter of the flexible pile is 0.5-0.6 m.
The spacing of the flexible piles is 0.2-0.4 m.
The flexible pile is one of a cement mixing pile, a high-pressure jet grouting pile or a CFG pile.
The utility model discloses compare prior art's beneficial effect is: on the basis of a traditional rigid uplift pile, the rigid pile is constructed in the range of the reinforced soil body after the reinforced soil body reaches a certain strength by constructing the flexible pile, and the rigid pile is connected with the flexible pile in an occluded manner, so that the rigid-flexible composite uplift pile with a larger outer pile diameter is formed, the contact soil body area of the uplift pile is further increased, the disturbance to the easily liquefied soil body or soft soil is reduced during the construction of the rigid pile, the side frictional resistance of the rigid pile is greatly increased compared with the condition that the rigid pile is directly contacted with the easily liquefied soil body or soft soil, and the side frictional resistance of the flexible pile is also increased; the pile body self weight of the rigid-flexible composite uplift pile is also improved, and the uplift resistance is further increased; in the construction process, no precipitation measure is needed, so that the adverse effects of construction pumping precipitation on the settlement of the surrounding environment and the like are greatly reduced; in the process of drilling and pile forming, a rigid protective cylinder is not needed, so that the engineering cost is reduced, the foundation is reinforced, and the bearing capacity of the foundation is improved.
Drawings
Fig. 1 is a sectional view of a rigid-flexible composite uplift pile.
Fig. 2 is a vertical sectional view of the rigid-flexible composite uplift pile.
Fig. 3 is a plan view of the rigid-flexible composite uplift pile.
Detailed Description
The invention will be further elucidated below on the basis of a specific embodiment.
The rigid-flexible composite uplift pile shown in fig. 1-3 comprises a plurality of uplift pile units, wherein each uplift pile unit comprises a rigid uplift pile 1 and a flexible pile 2, the number of the rigid uplift piles 1 is 1, and the rigid uplift piles 1 are located in the center; the number of the flexible piles 2 is multiple, and the flexible piles 2 are arranged around the rigid uplift pile 1; the rigid uplift pile 1 and the flexible pile 2 are mutually occluded, and the size of occlusion is 0.15-0.2 m; adjacent flexible piles 2 are mutually meshed, the size of meshing is not less than 0.25m, and at least two rows of flexible piles 2 are shown in figure 1, and the number of the flexible piles is two in the embodiment; the uplift pile units are arranged in a ring shape. In other embodiments of the present invention, as shown in fig. 3, the uplift pile units are arranged in a grid, with a longitudinal distance of L1 and a transverse distance of L2. The distance between the rigid uplift piles 1 of the two adjacent uplift pile units is not less than six times of the diameter of the rigid uplift pile 1. The diameter of the flexible pile 2 is 0.5-0.6m, in this embodiment 0.5 m. The flexible piles 2 are spaced at a distance of 0.2-0.4m, in this example 0.3 m. The flexible pile 2 is one of a cement mixing pile, a high-pressure jet grouting pile or a CFG pile, and in the embodiment, is a cement mixing pile. The cross section of the rigid uplift pile 1 is circular or square, and in the embodiment, the cross section is circular. The diameter of the rigid uplift pile 1 is 1m, and the length of the rigid uplift pile 1 is not less than 20 m. The rigid uplift pile 1 is a reinforced concrete drilled pile.
When the uplift pile is used, a calculation model is established according to project geological conditions, stratum mechanical parameters and the like, the structure meets the uplift force requirement by adjusting parameters such as the diameter of the rigid uplift pile, the pile plane arrangement form, the pile distance, the pile length and the like, and soil around the uplift pile is reinforced by selecting a flexible pile according to the plane arrangement form and the stratum condition of the uplift pile in design, wherein the installation method of the rigid-flexible composite uplift pile comprises the following steps:
a. arranging the flexible pile 2;
b. grouting and reinforcing the soil around the flexible pile 2; according to the diameter, the pile length and the stratum condition of the rigid uplift pile 1, for example, when the pile length is longer, the pile diameter is larger and the stratum at the pile side is worse, the row number and the diameter of the flexible pile 2 can be increased;
c. testing the compressive strength of the flexible pile 2, and if the compressive strength of the flexible pile 2 reaches the standard, arranging a rigid uplift pile 1 in the center of the flexible pile 2;
d. grouting and reinforcing the part below 0.6m of the base of the rigid uplift pile 1;
e. testing the compressive strength of the rigid uplift pile 1, if the compressive strength of the rigid uplift pile 1 reaches the standard, removing floating slurry of a part of the pile head and the part which do not meet the compressive strength on the rigid uplift pile 1, and then arranging the structural bottom plate at the top of the rigid uplift pile 1, wherein the thickness of the pile head of the rigid uplift pile 1 embedded into the structural bottom plate is not less than 70nm, 100nm in the embodiment, and the reinforcing steel bar of the pile head of the rigid uplift pile 1 is inserted into the structural bottom plate. In other embodiments of the present invention, the steel bar of the pile head of the rigid uplift pile 1 is inserted into the upper main bar of the foundation slab.
When measuring the compressive strength of the flexible pile 2 and the rigid uplift pile 1, a core sample method is adopted to extract a concrete core sample test piece for detection, and the compressive strength calculation mode of the concrete core sample test piece is as follows:
fcoris the compressive strength (MPa) of a concrete core sample specimen,
p is the breaking load (N) measured by the compression test of the core sample specimen,
d is the average diameter (mm) of the core specimen.
And when the compressive strength of the concrete core sample test piece reaches the standard value, the compressive strength reaches the standard.
The above is only the preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and for those skilled in the art, a plurality of modifications and improvements can be made without departing from the inventive concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention.
Claims (6)
1. A rigid-flexible composite uplift pile comprises a plurality of uplift pile units and is characterized in that the uplift pile units comprise rigid uplift piles and flexible piles, the number of the rigid uplift piles is 1, and the rigid uplift piles are located in the center; the number of the flexible piles is multiple, and the flexible piles are arranged around the rigid uplift pile; the rigid uplift pile and the flexible pile are mutually meshed, and the size of meshing is 0.15-0.2 m; adjacent flexible piles are mutually meshed, the size of meshing is not less than 0.25m, and at least two rows of flexible piles are arranged; the uplift pile units are arranged in a ring or grid mode, and the distance between the rigid uplift piles of two adjacent uplift pile units is not less than six times of the diameter of the rigid uplift pile.
2. The rigid-flexible composite uplift pile according to claim 1, wherein the cross section of the rigid uplift pile is circular or square.
3. The rigid-flexible composite uplift pile according to claim 1, wherein the rigid uplift pile is a reinforced concrete bored pile.
4. The rigid-flexible composite uplift pile according to claim 1, wherein the diameter of the flexible pile is 0.5-0.6 m.
5. The rigid-flexible composite uplift pile according to claim 1, wherein the flexible piles have a pitch of 0.2-0.4 m.
6. The rigid-flexible composite uplift pile according to claim 1, wherein the flexible pile is one of a cement mixing pile, a high-pressure jet grouting pile or a CFG pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022772948.2U CN214245685U (en) | 2020-11-26 | 2020-11-26 | Rigid-flexible composite uplift pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022772948.2U CN214245685U (en) | 2020-11-26 | 2020-11-26 | Rigid-flexible composite uplift pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214245685U true CN214245685U (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022772948.2U Active CN214245685U (en) | 2020-11-26 | 2020-11-26 | Rigid-flexible composite uplift pile |
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|---|---|
| CN (1) | CN214245685U (en) |
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2020
- 2020-11-26 CN CN202022772948.2U patent/CN214245685U/en active Active
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