CN211285607U - Concrete precast pile marine pile sinking auxiliary device - Google Patents
Concrete precast pile marine pile sinking auxiliary device Download PDFInfo
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- CN211285607U CN211285607U CN201921807282.0U CN201921807282U CN211285607U CN 211285607 U CN211285607 U CN 211285607U CN 201921807282 U CN201921807282 U CN 201921807282U CN 211285607 U CN211285607 U CN 211285607U
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Abstract
The utility model belongs to the technical field of offshore pile sinking, and discloses a concrete precast pile offshore pile sinking auxiliary device, which comprises a stirring grouting pipe, wherein the stirring grouting pipe is alternately provided with a plurality of stirring blade groups and a plurality of grouting port groups along the axial direction, and the stirring blade groups and the grouting port groups are arranged along the axial direction of the stirring grouting pipe at intervals; each stirring blade group comprises a plurality of stirring blades which are radially and uniformly distributed on the side wall of the stirring grouting pipe, and each grouting opening group comprises a plurality of grouting openings which are radially and uniformly distributed on the side wall of the stirring grouting pipe; the bottom end of the stirring grouting pipe is provided with a drill bit, and the stirring grouting pipe is connected with a rotary driving device. The utility model discloses effectively solved the concrete precast pile sinking difficulty problem that leads to by the strong frictional resistance of high stress state sand to the pile wall, effectively promoted the joint strength at sand and stake interface simultaneously, enlarged the effective stake footpath of concrete precast pile, improved the bearing capacity.
Description
Technical Field
The utility model belongs to the technical field of marine pile sinking, specific theory relates to a concrete precast pile marine pile sinking auxiliary device, the following dense sand soil environment of especially adapted sea surface.
Background
When the platform is operated on the sea, the platform foundation needs to be driven into a soil layer below seawater. Compared with land construction, the sea water pressure action exists above the soil layer of the marine pile foundation, so that the compactness of the soil body is higher, and a stronger stress field exists, so that the pile sinking of the marine concrete precast pile is more difficult. The sandy soil has rough surface, and can generate great friction resistance in the pile sinking process of the precast pile under a high stress field, so that the problem is more obvious in the sandy soil layer. Therefore, the offshore pile foundation generally adopts the steel pile, and compared with the concrete precast pile, the pile sinking frictional resistance can be reduced as much as possible. However, how to finish pile sinking of the concrete precast pile in the offshore high-stress sandy soil is not well solved, and the pile sinking of the concrete precast pile in the offshore sandy soil is to try to reduce the stress level of the sandy soil and the friction coefficient between the sandy soil and the pile side.
The cement-soil mixing pile is a foundation treatment method commonly used in land construction, and adopts a chemical reinforcing method of mixing cement slurry and soil into a cement reinforcing body. The land-based cement-soil mixing pile technology is generally used for reinforcing and treating weak foundation soil.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem who puts the force on solving marine concrete precast pile foundation soil below the sea water, pile sinking difficulty in the sand especially provides a concrete precast pile marine pile sinking auxiliary device, is applied to marine concrete precast pile construction with cement mixing pile technique, reduces concrete precast pile's pile sinking injection resistance to realize disposable pile sinking, save the time limit for a project.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
the offshore pile sinking auxiliary device for the concrete precast pile comprises a stirring grouting pipe, wherein a plurality of stirring blade groups and a plurality of grouting port groups are alternately arranged on the stirring grouting pipe along the axial direction, and the stirring blade groups and the grouting port groups are arranged at intervals along the axial direction of the stirring grouting pipe; each stirring blade group comprises a plurality of stirring blades which are uniformly distributed on the side wall of the stirring grouting pipe in the radial direction, and each grouting opening group comprises a plurality of grouting openings which are uniformly distributed on the side wall of the stirring grouting pipe in the radial direction; the bottom end of the stirring grouting pipe is provided with a drill bit, and the stirring grouting pipe is connected with a rotary driving device.
Further, the outer diameter of each stirring blade group is not smaller than that of the concrete precast pile.
Further, the stirring blade group and the grouting port group are arranged at equal intervals in the axial direction of the stirring grouting pipe.
Further, the surface of the drill bit is provided with a plurality of bulges.
The utility model has the advantages that:
firstly, the stirring blade group of the stirring grouting pipe of the utility model is used for stirring sandy soil with high stress level and high compactness, and destroying the original soil body structure to form a looser soil body structure; cement slurry is injected through a grouting port group of the stirring grouting pipe, so that the cement slurry and the sandy soil are fully mixed to form cement sandy soil with a lower stress level, and the roughness of the surface of sandy soil particles is reduced; after treatment, the filling resistance of the concrete pile during pile sinking is obviously reduced, and the sinking of the concrete precast pile in a sand body in a seawater environment can be smoothly realized.
After the stirring and grouting treatment of the utility model is utilized, the sandy soil and the cement slurry are mixed into the cement sandy soil, compared with the contact surface of the pile body, the contact surface of the untreated sandy soil and the pile body, the mechanical connection effect of the cement sandy soil is obviously improved; after the cement sand is cured, the cement sand is effectively connected with the outer wall of the concrete precast pile, the effective stress range of the concrete precast pile is enlarged, and the bearing capacity of the concrete precast pile is obviously improved.
Drawings
Fig. 1 is a schematic structural view of the offshore pile sinking auxiliary device for a concrete precast pile provided by the utility model;
FIG. 2 is a schematic view showing the drilling and stirring operation state during the construction process using the present invention;
FIG. 3 is a schematic view showing the grouting and stirring operation state during the construction process using the present invention;
FIG. 4 is a schematic view showing the pile sinking operation state in the construction process of the present invention;
fig. 5 is a horizontal sectional view of a concrete precast pile and cement sand mixed structure.
In the above figures: 1-stirring blade group; 2-grouting port group; 3-stirring a grouting pipe; 4-a drill bit; 5-cement sand soil; 6-precast concrete pile.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1, the present embodiment provides an auxiliary device for offshore pile sinking of a concrete precast pile, which includes a steel stirring grouting pipe 3, and the stirring grouting pipe 3 is provided with a plurality of stirring blade groups 1 and a plurality of grouting port groups 2. The stirring blade groups 1 and the grouting port groups 2 are alternately arranged in the axial direction of the stirring grouting pipe 3, and the stirring blade groups 1 and the grouting port groups 2 are arranged at intervals. When the stirring blade group 1 and the grouting opening group 2 are arranged at equal intervals along the axial direction of the stirring grouting pipe 3, the grouting stirring effect is better.
Each stirring blade group 1 includes a plurality of stirring blades which are uniformly distributed in the radial direction on the side wall of the stirring slip casting pipe 3. The outer diameter of the stirring blade group 1 (i.e., the circumscribed circle diameter of the plurality of stirring blades in the stirring blade group 1) is not smaller than the outer diameter of the concrete precast pile 6.
Each of the grouting port groups 2 includes a plurality of grouting ports which are radially and uniformly distributed on the sidewall of the agitating grouting pipe 3.
The bottom of stirring slip casting pipe 3 sets up drill bit 4, and drill bit 4 passes through bolt or screw thread fixed connection in the bottom of stirring slip casting pipe 3, or drill bit 4 and stirring slip casting pipe 3 integrated into one piece. The drill bit 4 makes the sandy soil on the lower part of the stirring grouting pipe 3 soft by drilling downwards, and reduces the resistance of the stirring grouting pipe 3 in the sinking process. The surface of the drill bit 4 is provided with a plurality of bulges so as to facilitate smooth downward drilling in soil.
The stirring slip casting pipe 3 is connected with a rotation driving device, and the rotation driving device drives the stirring slip casting pipe 3 to rotate around the axis thereof. The stirring slip casting pipe 3 not only conveys cement slurry for the slip casting port group 2, but also drives the drill bit 4, the stirring blade group 1 and the slip casting port group 2 to rotate through the rotation of the stirring slip casting pipe 3, and provides torque for the drill bit 4, the stirring blade group 1 and the slip casting port group 2.
Therefore, as the stirring grouting pipe 3 drills downwards, sandy soil with high stress level and high compactness is stirred through the stirring blade group 1, the original soil body structure is damaged, and a looser soil body structure is formed; cement slurry is injected through the grouting port group 2, so that the cement slurry and the sand are fully mixed to form cement sand with lower stress level, and the roughness of the surface of sand particles is reduced; the filling resistance when the pile is sunk after treatment is obviously reduced, and the sinking of the concrete precast pile in a sand soil body in a seawater environment can be smoothly realized.
The utility model discloses a concrete precast pile marine pile sinking auxiliary device utilizes cement mixing technique to handle the sand of the high stress state in the sea water, not for forming cement mixing stake, but borrows slip casting and stirring and makes the sand become soft, reduces the closely knit degree of disposal area sand to make the stake soil contact surface lubricated, stake end resistance and stake side resistance when reducing the pile sinking.
Utilize the utility model discloses a concrete precast pile marine pile sinking auxiliary device carries out marine pile sinking work progress as follows:
the method comprises the following steps: and (5) positioning the pile sinking position, and vertically placing the stirring grouting pipe 3 right above the pile sinking position.
Step two: as shown in fig. 2, the drilling and stirring work is performed: and (3) starting the rotary driving equipment, lowering the stirring grouting pipe 3, drilling by using the drill bit 4, and stirring by using the stirring blade group 1 until the drill bit 4 reaches the pile sinking elevation of the designed concrete precast pile 6. This step changes the sand in the stirred zone from a high stress compacted state to a looser state, resulting in a sand with a lower stress level.
Step three: as shown in fig. 3, the grouting and stirring operations are performed: keeping the height of the stirring grouting pipe 3 unchanged, conveying cement slurry to the stirring grouting pipe 3 through a grouting pump, injecting the cement slurry through the grouting port group 2, and mixing the cement slurry and the sandy soil by using the stirring blade group 1 to fully stir and mix the prepared cement slurry and the sandy soil at the position of the pile to be sunk to form cement sandy soil 5.
Wherein, considering the dilution effect of seawater on the slurry, the water-cement ratio of the used cement slurry is not more than 0.4.
Step four: the mixing slip pipe 3 is lifted up from the loose cement mortar 5.
Step five: as shown in fig. 3, the precast concrete pile 6 is lowered to a designed pile-sinking elevation position using a pile-sinking apparatus.
The precast concrete pile 6 is precast before the pile sinking operation in offshore construction, the impervious grade of the cement adopted by the precast concrete pile 6 is not less than P8, and the concrete grade is determined according to the seawater pressure on the top of the pile. In addition, the concrete precast pile 6 can be precast, cured and formed into a pile in advance by adopting impervious and corrosion-resistant concrete, concrete curing is not needed to be carried out under the sea, higher pile forming quality is ensured, and adverse effects of various harmful ions in the sea to the durability of the concrete precast pile 6 during the curing of the bored pile in an underwater environment can be avoided.
Step six: and standing and maintaining the cement sand 5 until the strength of the cement sand 5 reaches the requirement.
After standing and maintaining, as shown in fig. 4, an effective connection with sufficient strength is formed between the cement sand 5 and the concrete precast pile 6, so that a stressed working whole is formed, and the bearing capacity of the concrete precast pile 6 is increased.
Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make various changes without departing from the spirit and the scope of the invention as claimed.
Claims (4)
1. The offshore pile sinking auxiliary device for the concrete precast pile is characterized by comprising a stirring grouting pipe, wherein the stirring grouting pipe is alternately provided with a plurality of stirring blade groups and a plurality of grouting port groups along the axial direction, and the stirring blade groups and the grouting port groups are arranged at intervals along the axial direction of the stirring grouting pipe; each stirring blade group comprises a plurality of stirring blades which are uniformly distributed on the side wall of the stirring grouting pipe in the radial direction, and each grouting opening group comprises a plurality of grouting openings which are uniformly distributed on the side wall of the stirring grouting pipe in the radial direction; the bottom end of the stirring grouting pipe is provided with a drill bit, and the stirring grouting pipe is connected with a rotary driving device.
2. The offshore pile sinking auxiliary device for the concrete precast pile as recited in claim 1, wherein the outer diameter of each stirring blade group is not less than the outer diameter of the concrete precast pile.
3. The offshore pile sinking auxiliary device for the concrete precast pile as recited in claim 1, wherein the mixing blade group and the grouting port group are arranged at equal intervals along the axial direction of the mixing grouting pipe.
4. An offshore pile sinking aid for a concrete precast pile as claimed in claim 1, wherein said drill bit surface is provided with a plurality of protrusions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921807282.0U CN211285607U (en) | 2019-10-25 | 2019-10-25 | Concrete precast pile marine pile sinking auxiliary device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921807282.0U CN211285607U (en) | 2019-10-25 | 2019-10-25 | Concrete precast pile marine pile sinking auxiliary device |
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| Publication Number | Publication Date |
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| CN211285607U true CN211285607U (en) | 2020-08-18 |
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| CN201921807282.0U Active CN211285607U (en) | 2019-10-25 | 2019-10-25 | Concrete precast pile marine pile sinking auxiliary device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162324A (en) * | 2022-09-05 | 2022-10-11 | 中交第三航务工程局有限公司江苏分公司 | Precast pile structure suitable for multiple soil layers and static pile pressing construction method thereof |
| CN116180712A (en) * | 2023-02-10 | 2023-05-30 | 湖南大学 | Strong stirring device and application thereof |
-
2019
- 2019-10-25 CN CN201921807282.0U patent/CN211285607U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162324A (en) * | 2022-09-05 | 2022-10-11 | 中交第三航务工程局有限公司江苏分公司 | Precast pile structure suitable for multiple soil layers and static pile pressing construction method thereof |
| CN115162324B (en) * | 2022-09-05 | 2022-11-25 | 中交第三航务工程局有限公司江苏分公司 | Precast pile structure suitable for multiple soil layers and static pile pressing construction method thereof |
| CN116180712A (en) * | 2023-02-10 | 2023-05-30 | 湖南大学 | Strong stirring device and application thereof |
| CN116180712B (en) * | 2023-02-10 | 2024-04-30 | 湖南大学 | Strong stirring device and application thereof |
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