阅读说明：本技术 一种海上风电钢管桩联合加固装置及加固方法 (Offshore wind power steel pipe pile combined reinforcing device and reinforcing method ) 是由 戴国亮 刘琨 万志辉 厉明 高鲁超 齐伟 刘广东 胡从川 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种海上风电钢管桩联合加固装置及加固方法,属于海上基础地基加固技术领域。装置包括钢管桩；还包括：注浆管,其有若干个,均沿着钢管桩内侧壁竖直布置,所述注浆管底部出浆口贯穿钢管桩侧壁并连通至钢管桩外侧；水泥土搅拌桩,其有若干个,均竖直布置于钢管桩外侧。本发明设置注浆管结构以实现桩侧注浆,配合水泥土搅拌桩深层联合加固,一方面能提高桩侧摩擦阻力,提高桩基竖向承载力,减少竖向沉降,另一方面深层搅拌桩能够改善浅层土体特征,提高桩基水平承载力,减小水平变位,配合本发明的海上风电钢管桩联合加固装置,有效地提高桩基水平和竖向承载能力,降低海上风电工程成本,确保风机结构的安全和稳定。(The invention discloses a combined reinforcing device and a reinforcing method for an offshore wind power steel pipe pile, and belongs to the technical field of offshore foundation reinforcement. The device comprises a steel pipe pile; further comprising: a plurality of grouting pipes are vertically arranged along the inner side wall of the steel pipe pile, and a grout outlet at the bottom of each grouting pipe penetrates through the side wall of the steel pipe pile and is communicated to the outer side of the steel pipe pile; and the cement soil mixing piles are vertically arranged on the outer side of the steel pipe pile. The offshore wind power steel pipe pile combined reinforcing device is provided with the grouting pipe structure to realize pile side grouting, and is matched with a cement soil mixing pile to perform deep combined reinforcement, so that on one hand, the pile side friction resistance can be improved, the vertical bearing capacity of a pile foundation is improved, and the vertical settlement is reduced, on the other hand, the deep mixing pile can improve the characteristics of a shallow soil body, improve the horizontal bearing capacity of the pile foundation, and reduce the horizontal deflection.)

1. A combined reinforcing device for an offshore wind power steel pipe pile comprises,

steel pipe piles;

it is characterized by also comprising:

a plurality of grouting pipes are vertically arranged along the inner side wall of the steel pipe pile, and a grout outlet at the bottom of each grouting pipe penetrates through the side wall of the steel pipe pile and is communicated to the outer side of the steel pipe pile;

and the cement soil mixing piles are vertically arranged on the outer side of the steel pipe pile.

2. The offshore wind power steel pipe pile joint reinforcement device according to claim 1, further comprising:

and the protection cylinders are provided with a plurality of protection cylinders, the protection cylinders are fixedly connected to the filling device along the inner side wall of the steel pipe pile vertically, and the grouting pipes are arranged in the protection cylinders.

3. The offshore wind power steel pipe pile joint reinforcement device according to claim 2, further comprising:

the grouting hole penetrates through the side wall of the steel pipe pile, and a grouting outlet at the bottom of the grouting pipe is communicated with the grouting hole;

and the outer side protection chamber is a hollow chamber and is fixedly connected to the outer side wall of the steel pipe pile, one end of the hollow chamber of the outer side protection chamber is communicated with the grouting hole, and the other end of the hollow chamber of the outer side protection chamber is provided with a hole communicated with the outside.

4. The offshore wind power steel pipe pile combined reinforcement device according to claim 3, characterized in that: the bottom surface of the protective cylinder is an inclined angle.

5. The offshore wind power steel pipe pile joint reinforcement device according to claim 4, further comprising:

and the reinforcing plate is arranged at the bottom of the outer side protection chamber and is fixedly connected with the outer side protection chamber and the outer side wall of the steel pipe pile respectively.

6. The offshore wind power steel pipe pile combined reinforcement device according to claim 5, characterized in that: the bottom surface of the outer side protection chamber is an inclined angle.

7. The offshore wind power steel pipe pile combined reinforcement device according to claim 6, characterized in that: the reinforcement depth H =3D ~4D of cement mixing pile, consolidates width B =5D ~10D, and wherein D is the steel-pipe pile external diameter.

8. The combined reinforcement method for the offshore wind power steel pipe pile is characterized by comprising the following steps:

s1, forming a pile, namely, hoisting the steel pipe pile to a pile position, and performing pile sinking operation;

s2, grouting, namely after the steel pipe pile is formed into a pile, grouting into a grouting pipe, enabling slurry to flow to an outer side protection chamber through a grouting hole through the grouting pipe, enabling the slurry to flow out of the hole and injecting into a pile side soil body;

and S3, constructing the deep mixing pile, preparing cement paste, and constructing the cement soil mixing pile around the steel pipe pile according to the design requirement.

9. The offshore wind power steel pipe pile combined reinforcement method according to claim 8, characterized in that: steps S2 and S3 may be performed simultaneously or sequentially.

10. The offshore wind power steel pipe pile combined reinforcement method according to claim 9, characterized in that: the design requirement of the step S3 is that each cement mixing pile is arranged in a vertical equal length mode, adjacent cement mixing piles are mutually overlapped, each cement mixing pile is arranged in a lattice mode or in a wall-hanging mode in the horizontal direction, the reinforcement depth H = 3D-4D and the reinforcement width B = 5D-10D, and D is the outer diameter of the steel pipe pile.

Technical Field

The invention belongs to the technical field of foundation reinforcement of offshore foundations, and particularly relates to a combined reinforcement device and a reinforcement method for an offshore wind power steel pipe pile.

Background

The foundation form of offshore wind power mainly comprises a single-pile foundation, a gravity type foundation, a suction bucket foundation, a floating type foundation and the like, wherein the single-pile foundation is widely applied due to the characteristics of strong adaptability, high bearing capacity and the like. Under a complex marine environment, the steel pipe pile foundation is influenced by factors such as waves, ocean currents, tidal currents, wind loads and the like, so that the steel pipe pile foundation generates large horizontal displacement, and the horizontal bearing capacity of the steel pipe pile foundation is influenced. The vertical bearing capacity of the pile foundation is influenced by the fan supporting structure due to factors such as strong wind, dead weight and the like.

The coastline of China is wide, the geological conditions of various sea areas are complex, the shallow soil mass is mainly soft clay, and the soil quality is relatively poor. The offshore wind power single pile foundation is slightly different from the land wind power and bridge pile foundation in stress form and is greatly influenced by external load. Therefore, the horizontal and vertical bearing capacity of a pile foundation is improved by generally adopting a method for increasing the pile diameter in engineering, according to survey, the diameter of the foundation pile of the offshore wind power steel pipe pile reaches about 8m, the manufacturing cost of the steel pipe pile is increased due to the increase of the pile diameter, the construction difficulty is improved, and the existing construction machinery is difficult to be competent for the development of offshore wind power in the future.

In view of the problems existing in the offshore wind power steel pipe pile foundation, the problem to be solved urgently is to improve the bearing characteristic of the steel pipe pile, reduce the engineering cost and improve the feasibility of engineering construction.

Disclosure of Invention

In order to solve at least one of the above technical problems, according to an aspect of the present invention, there is provided an offshore wind power steel pipe pile joint reinforcement device, including:

steel pipe piles;

further comprising:

a plurality of grouting pipes are vertically arranged along the inner side wall of the steel pipe pile, and a grout outlet at the bottom of each grouting pipe penetrates through the side wall of the steel pipe pile and is communicated to the outer side of the steel pipe pile;

and the cement soil mixing piles are vertically arranged on the outer side of the steel pipe pile.

According to the embodiment of the invention, the offshore wind power steel pipe pile combined reinforcement device optionally further comprises:

and the protection cylinders are provided with a plurality of protection cylinders, the protection cylinders are fixedly connected to the filling device along the inner side wall of the steel pipe pile vertically, and the grouting pipes are arranged in the protection cylinders.

According to the embodiment of the invention, the offshore wind power steel pipe pile combined reinforcement device optionally further comprises:

the grouting hole penetrates through the side wall of the steel pipe pile, and a grouting outlet at the bottom of the grouting pipe is communicated with the grouting hole;

and the outer side protection chamber is a hollow chamber and is fixedly connected to the outer side wall of the steel pipe pile, one end of the hollow chamber of the outer side protection chamber is communicated with the grouting hole, and the other end of the hollow chamber of the outer side protection chamber is provided with a hole communicated with the outside.

According to the offshore wind power steel pipe pile combined reinforcement device provided by the embodiment of the invention, optionally, the bottom surface of the protection cylinder is inclined.

According to the embodiment of the invention, the offshore wind power steel pipe pile combined reinforcement device optionally further comprises:

and the reinforcing plate is arranged at the bottom of the outer side protection chamber and is fixedly connected with the outer side protection chamber and the outer side wall of the steel pipe pile respectively.

According to the offshore wind power steel pipe pile combined reinforcement device provided by the embodiment of the invention, optionally, the bottom surface of the outer side protection chamber is an inclined angle.

According to the offshore wind power steel pipe pile combined reinforcement device provided by the embodiment of the invention, optionally, the reinforcement depth H = 3D-4D and the reinforcement width B = 5D-10D of the cement-soil mixing pile, wherein D is the outer diameter of the steel pipe pile.

According to another aspect of the invention, a combined reinforcing method for an offshore wind power steel pipe pile is provided, which comprises the following steps:

s1, forming a pile, namely, hoisting the steel pipe pile to a pile position, and performing pile sinking operation;

s2, grouting, namely after the steel pipe pile is formed into a pile, grouting into a grouting pipe, enabling slurry to flow to an outer side protection chamber through a grouting hole through the grouting pipe, enabling the slurry to flow out of the hole and injecting into a pile side soil body;

and S3, constructing the deep mixing pile, preparing cement paste, and constructing the cement soil mixing pile around the steel pipe pile according to the design requirement.

According to the offshore wind power steel pipe pile combined reinforcement method provided by the embodiment of the invention, the steps S2 and S3 can be performed simultaneously or sequentially.

According to the offshore wind power steel pipe pile combined reinforcement method provided by the embodiment of the invention, optionally, the design requirement of the step S3 is that each cement soil mixing pile is vertically arranged in equal length, adjacent cement soil mixing piles are mutually overlapped, each cement soil mixing pile is arranged in a lattice type or wall-hanging type in the horizontal direction, the reinforcement depth H = 3D-4D and the reinforcement width B = 5D-10D of each cement soil mixing pile are provided, and D is the outer diameter of the steel pipe pile.

Has the advantages that:

the offshore wind power steel pipe pile combined reinforcing device is provided with the grouting pipe structure to realize pile side grouting, and is matched with the cement soil mixing pile to realize deep combined reinforcement, so that on one hand, the pile side friction resistance can be improved, the vertical bearing capacity of a pile foundation can be improved, the vertical settlement can be reduced, on the other hand, the characteristics of a shallow soil body can be improved by the deep mixing pile, the horizontal bearing capacity of the pile foundation can be improved, and the horizontal deflection can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.

FIG. 1 shows a cross-sectional view of an offshore wind power steel pipe pile combined reinforcement device of the invention;

FIG. 2 shows a cross-sectional view A-A of FIG. 1;

FIG. 3 is a plan view showing an arrangement of cement mixing piles according to the present invention;

FIG. 4 is a plan view showing another arrangement of cement mixing piles according to the present invention;

FIG. 5 illustrates a flow chart of a consolidation method of the present invention;

reference numerals:

1. steel pipe piles; 2. a grouting pipe; 3. a protective cylinder; 4. grouting holes; 5. a second grouting pipe; 6. an outer protective chamber; 7. a reinforcing plate; 8. mixing the cement soil with the pile; 10. and (4) holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.

Example 1

As shown in fig. 1, the offshore wind power steel pipe pile of this embodiment unites reinforcing apparatus, sets up slip casting pipe 2 structure in order to realize stake side slip casting, and 8 deep layers of cooperation cement mixing pile unite to consolidate, can improve stake side frictional resistance on the one hand, improve the vertical bearing capacity of pile foundation, reduce vertical settlement, and shallow soil body characteristic can be improved to the deep mixing pile of on the other hand, improves pile foundation horizontal bearing capacity, reduces the level and shifts.

According to the offshore wind power steel pipe pile combined reinforcement device, the grouting pipes 2 are uniformly arranged along the periphery of the steel pipe pile 1 and are vertically arranged along the inner side wall of the steel pipe pile 1, the protection barrel 3 is sleeved outside the grouting pipes 2, the protection barrel 3 plays a role of protecting the grouting pipes 2, the protection barrel 3 is welded and fixed on the inner side wall of the steel pipe pile 1, a plurality of grouting pipes 2 can be arranged in one protection barrel 3, as shown in fig. 2, a second grouting pipe 5 is further arranged, further, the height of the top surface of the protection barrel 3 is 100-300 cm lower than that of the top of the steel pipe pile 1, the bottom surface of the protection barrel 3 is obliquely arranged and presents an inclination angle, and the protection barrel 3 and the grouting pipes 2 can be effectively prevented from being damaged due to pile driving; the top of the grouting pipe 2 is connected with an external grouting platform, a bottom grout outlet penetrates through the side wall of the steel pipe pile 1 and is communicated to the outer side of the steel pipe pile 1, furthermore, a grouting hole 4 is formed in the side wall of the steel pipe pile 1 in a penetrating mode, the bottom grout outlet of the grouting pipe 2 is communicated with the grouting hole 4, multiple layers of grouting holes 4 can be arranged at equal intervals along the axial direction of the steel pipe pile 1, and multiple grout outlets are formed in the bottom of the grouting pipe 2 along the axial direction, so that the purpose of grouting at different depths is achieved; an outer side protection chamber 6 is fixedly welded at the outer side wall of the steel pipe pile 1 where the grouting hole 4 is located, as shown in fig. 1 and fig. 2, the outer side protection chamber 6 is a hollow chamber, one end of the hollow chamber is communicated with the grouting hole 4, the other end of the hollow chamber is provided with a hole 10 to be communicated with the outside, slurry passes through the grouting hole 4 through the grouting pipe 2 and flows to the outer side protection chamber 6, then flows out of the hole 10 and is injected into a pile side soil body; the reinforcing plate 7 is arranged at the bottom of the outer side protection chamber 6, the reinforcing plate 7 is fixedly welded with the outer side protection chamber 6 and the outer side wall of the steel pipe pile 1 respectively to reinforce the connection strength of the outer side protection chamber 6 and the outer side wall of the steel pipe pile 1, the bottom surface of the outer side protection chamber 6 is also obliquely arranged to form an inclination angle, and the structural damage of the outer side protection chamber 6 caused by pile driving is effectively prevented.

The soil cement mixing pile 8 of this embodiment has a plurality of, all vertical arrangement is in the 1 outside of steel-pipe pile, and each soil cement mixing pile 8 arranges along 1 circumference of steel-pipe pile, the equal vertical length of each soil cement mixing pile 8, adjacent soil cement mixing pile 8 overlap joint each other, each soil cement mixing pile 8 is the lattice formula at the horizontal direction and arranges as shown in fig. 3 or wall-hanging as shown in fig. 4, wherein the reinforcement depth H =3D ~4D of soil cement mixing pile 8, reinforcement width B =5D ~10D, wherein D is steel-pipe pile 1 external diameter, under this reinforcement depth H and reinforcement width B's injecture, soil cement mixing pile 8 can obtain the optimal reinforcement effect under the prerequisite of ensureing construction cost.

Example 2

As shown in fig. 5, the method for jointly reinforcing an offshore wind power steel pipe pile according to the embodiment includes the following steps:

s1, forming a pile, namely, hoisting the steel pipe pile 1 to a pile position, and performing pile sinking operation;

s2, grouting, after the steel pipe pile 1 is formed into a pile, grouting into the grouting pipe 2, enabling the grout to pass through the grouting hole 4 through the grouting pipe 2 and flow to the outer side protection chamber 6, then flowing out of the hole 10 and injecting into a pile side soil body;

and S3, constructing the deep mixing pile, preparing cement paste, and constructing the cement soil mixing pile 8 around the steel pipe pile 1 according to design requirements.

Step S2 and step S3 are both carried out after the steel pipe pile 1 is formed, and the two steps can be carried out simultaneously or successively; further, in step S3, before preparing cement paste, determining parameters such as cement mixing ratio and water cement ratio by an indoor test, and then determining design requirements of the cement-soil mixing piles 8, that is, the cement-soil mixing piles 8 are arranged in a vertical equal length manner, the adjacent cement-soil mixing piles 8 are mutually overlapped, the cement-soil mixing piles 8 are arranged in a lattice manner or a wall-hanging manner in the horizontal direction, the reinforcement depth H = 3D-4D and the reinforcement width B = 5D-10D, wherein D is the outer diameter of the steel pipe pile 1; then, each soil-cement mixing pile 8 is constructed as required by a mixer, and the construction is made into a lattice type as shown in fig. 3 or a wall-hanging type as shown in fig. 4.

The offshore wind power steel pipe pile combined reinforcement method can effectively improve the horizontal and vertical bearing capacity of the pile foundation, reduce the cost of offshore wind power engineering, and ensure the safety and stability of the fan structure.

The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.