CN110106904B - Steel pipe pile structure and jacket foundation construction process - Google Patents

Abstract

The invention discloses a steel pipe pile structure and a jacket foundation construction process, wherein the steel pipe pile structure comprises a steel pipe pile body, a partition plate is arranged in the steel pipe pile body, the partition plate is perpendicular to the axial direction of the steel pipe pile body, and the partition plate divides the steel pipe pile body into a grouting section and a mud feeding section which are isolated from each other; the side wall of the steel pipe pile body is provided with a plurality of pile body openings at the grouting section. The invention avoids underwater pile cleaning construction, solves the problem that the traditional offshore steel pipe pile construction needs underwater pile cleaning by a diver or an underwater robot, can save the construction cost and shorten the construction period to a certain extent, reduces the construction procedures and reduces the risk of offshore construction; meanwhile, the grouting section is ensured to be positioned below the mud surface, and compared with the technical scheme of grouting on the mud surface, the grouting section is favorable for structural safety, reduces the construction cost and reduces the steel consumption of steel.

Description

Steel pipe pile structure and jacket foundation construction process

Technical Field

The invention relates to the technical field of steel pipe piles, in particular to a steel pipe pile structure and a jacket foundation construction process.

Background

In offshore wind power engineering, a jacket foundation is a common type of wind turbine foundation. As shown in the attached drawing 1, the jacket foundation is driven into the sea bottom by three or more than three steel pipe piles, and the jacket 1 and the steel pipe pile body 2 are connected into a whole through grouting. Therefore, after the steel pipe pile body 2 is driven, a section of grouting section 3 which is left empty on the inner side of the pile top needs to be ensured so as to put in the jacket supporting leg 4 and carry out grouting connection.

The existing jacket foundation usually adopts a construction process of underwater pile cleaning to remove sea mud on the inner side of a pile top section so as to leave a blank section connected with jacket grouting, as shown in figure 2. The pile can be cleaned manually or by an underwater robot. After the steel-pipe pile is driven into the design elevation according to the design requirement, a diver or an underwater robot carries pile cleaning equipment to submerge into the seabed, a high-pressure water gun and the like are utilized to wash the inner side of the top section of the pile, soil and marine life in the pile are flushed out, and the pile is emptied of soil and then placed into a jacket for grouting connection. The construction process has the following disadvantages: (1) the underwater construction difficulty is high, the pile cleaning effect is difficult to guarantee, the uncertainty is more, and the sea mud in the grouting section 3 is difficult to clean by manually cleaning the pile; (2) underwater pile cleaning needs to be provided with a diver or an underwater robot, and extra manpower and material resources are needed, so that the construction cost is increased; (3) in a sea area with deep water depth, the safety risk of diving into the sea bottom of a diver is high, and safety accidents are easy to occur. Therefore, underwater pile cleaning is always a difficult problem which is difficult to solve for engineering personnel.

Another construction process is a scheme of grouting above a mud surface, that is, a steel pipe pile is manufactured by a certain length during processing and manufacturing, a length which can be used for grouting connection is reserved above the mud surface after the steel pipe pile is driven, and the grouting process is completed above the mud surface after the steel pipe pile is placed into a jacket, as shown in figure 3. The technical scheme avoids underwater pile cleaning construction. However, the construction process has the following disadvantages: (1) the length of the manufactured steel pipe pile is longer, and the manufacturing cost of the steel pipe pile is increased; (2) the length of the steel pipe pile extending out of the mud surface is long, so that the main body structure is safe and unfavorable, and the installation difficulty and the operation risk of the submarine cable are increased; (3) the calculation shows that by adopting the technical scheme, the strength of the components of the steel pipe pile and the jacket needs to be obviously enhanced, the section of the jacket component needs to be increased, the wall thickness of the steel pipe pile needs to be increased, the steel consumption needs to be increased by more than 20%, and the structural cost is increased.

Therefore, a new steel pipe pile structure and a jacket foundation construction process need to be designed to solve the problem of difficult construction of the jacket foundation.

Disclosure of Invention

The invention aims to provide a steel pipe pile structure and a jacket foundation construction process, which can reduce the construction risk of an offshore jacket foundation, ensure the structure safety and reduce the construction cost.

In order to achieve the purpose, the steel pipe pile structure provided by the invention comprises a steel pipe pile body, wherein a partition plate is arranged inside the steel pipe pile body, the partition plate is perpendicular to the axial direction of the steel pipe pile body, and the partition plate divides the steel pipe pile body into a grouting section and a mud feeding section which are isolated from each other; and the side wall of the steel pipe pile body is provided with a plurality of pile body openings at the mud inlet section.

Preferably, the pile body open pores are uniformly distributed along the radial direction of the steel pipe pile body.

Preferably, the pile body opening is arranged close to the isolation plate.

Preferably, the pile body openings are uniformly distributed along the radial direction and the axial direction of the steel pipe pile body.

Preferably, a stiffening rib plate is arranged between the isolation plate and the steel pipe pile body.

Preferably, the stiffening rib plate is arranged in the grouting section and above the isolation plate, the bottom of the stiffening rib plate is fixedly connected with the upper surface of the isolation plate, and the side part of the stiffening rib plate is fixedly connected with the inner side wall of the steel pipe pile body.

Preferably, the stiffening rib plates are in a grid shape.

Preferably, the stiffening rib plate is of a central symmetry structure.

Preferably, the steel pipe pile body and the isolation plate are in welded connection, and the stiffening rib plates are in welded connection with the steel pipe pile body and the isolation plate.

The invention also discloses a jacket foundation construction process of the steel pipe pile structure, which comprises the following steps:

(1) driving the steel pipe pile body to a preset pile top elevation, and enabling the grouting section of the steel pipe pile body to be located below a mud level;

(2) hoisting a jacket by using hoisting equipment and putting down the jacket, so that jacket support legs extend into the grouting section of the steel pipe pile body until the jacket support legs abut against the isolation plate;

(3) and pouring concrete into the grouting section of the steel pipe pile body.

Compared with the prior art, the steel pipe pile structure and the jacket foundation construction process have the advantages that: when the steel pipe pile structure is constructed, a hollow grouting section for grouting connection can be reserved on the pile top as required, so that underwater pile cleaning construction is avoided, the problem that a diver or an underwater robot needs to be used for underwater pile cleaning in the traditional offshore steel pipe pile construction is solved, the engineering cost can be saved to a certain extent, the construction period can be shortened, the construction procedures can be reduced, and the risk of offshore construction can be reduced; meanwhile, the grouting section is ensured to be positioned below the mud surface, and compared with the technical scheme of grouting on the mud surface, the grouting section is favorable for structural safety, reduces the construction cost and reduces the steel consumption of steel. The structure type of the invention is suitable for steel pipe pile engineering needing underwater grouting, and has better applicability in offshore wind power engineering.

Drawings

FIG. 1 is a schematic structural view of a prior art jacket foundation;

FIG. 2 is a schematic diagram of a steel pipe pile structure according to the prior art;

FIG. 3 is a schematic view showing an application of another steel pipe pile structure of the prior art;

fig. 4 is a schematic structural view of a steel pipe pile structure according to an embodiment of the present invention;

fig. 5 is a plan view of a steel pipe pile structure according to an embodiment of the present invention.

The method comprises the following steps of 1-jacket, 2-steel pipe pile body, 3-grouting section, 4-jacket supporting legs, 5-mud line, 6-isolation plate, 7-mud entering section, 8-pile body hole opening, 9-stiffening rib plate and 10-pile top elevation.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Referring to fig. 4, the steel pipe pile structure provided by the invention comprises a steel pipe pile body 2, wherein a partition plate 6 is arranged inside the steel pipe pile body 2, the partition plate 6 is arranged perpendicular to the axial direction of the steel pipe pile body 2, and the partition plate 6 divides the steel pipe pile body 2 into a grouting section 3 and a mud feeding section 7 which are isolated from each other; the side wall of the steel pipe pile body 2 is provided with a plurality of pile body open pores 8 at the grouting section 3.

The steel pipe pile structure based on the technical characteristics can be applied to offshore engineering. The division plate 6 is located at the bottom of the grouting section 3, the area of the division plate 6 is the same as the inner area of the steel pipe pile body 2, the steel pipe pile body 2 is divided into an upper part and a lower part, and the grouting section 3 at the upper part is guaranteed to have no sediment to enter in the steel pipe pile driving process. The pile body opening 8 is used for discharging water and soil bodies extruded by the isolation plate 6 in the driving process of the steel pipe pile. Through the structure, a hollow grouting section for grouting connection can be reserved on the pile top of the steel pipe pile according to needs, so that underwater pile cleaning construction is avoided, the problem that a diver or an underwater robot needs to clean the pile underwater in the traditional offshore steel pipe pile construction is solved, the construction cost can be saved to a certain extent, the construction period can be shortened, the construction procedures can be reduced, and the risk of offshore construction can be reduced; meanwhile, the grouting section is ensured to be positioned below the mud surface line, and compared with the technical scheme of grouting on the mud surface line, the grouting section is more favorable for structural safety, reduces the construction cost and reduces the steel consumption of steel. The structure type of the invention is suitable for steel pipe pile engineering needing underwater grouting, and has better applicability in offshore wind power engineering.

In the present embodiment, the steel pipe pile body 2 is an open-type driven steel pipe pile, and the length, wall thickness, and the like thereof are determined according to design requirements. The grouting section 3 is located at the upper part of the steel pipe pile body 2, and the mud feeding section 7 is located at the lower part of the steel pipe pile body 2. The length of the grouting section 3 needs to meet the grouting requirement.

The partition plate 6 may be a steel plate.

The pile body opening 8 is used for discharging water and soil extruded by the isolation plate 6 in the driving process of the steel pipe pile so as to prevent overlarge pressure in the mud inlet section 7 and enable the steel pipe pile to be driven smoothly. The number and the positions of the pile body openings can be arranged at equal intervals or at unequal intervals according to the design requirement.

In an embodiment of the invention, the pile body openings 8 are uniformly distributed along the radial direction of the steel pipe pile body 2. Pile body trompil 8 is located 6 below of division board and being close to division board 6 sets up to it is right to reduce the water and the silt that go into in mud section 7 division board 6's extrusion.

In another embodiment of the invention, the pile body openings 8 are uniformly distributed along the radial direction and the axial direction of the steel pipe pile body 2.

Further, a reinforcing structure for reinforcing the strength of the partition plate 6 is provided between the partition plate 6 and the steel pipe pile body 2, so as to prevent the partition plate 6 from being damaged during driving of the steel pipe pile. Preferably, the reinforcing structure may be a stiffening rib 9. The reinforcing structure can also adopt other structural patterns for enhancing the strength of the isolation plate 6.

Further, the stiffening rib plate 9 is arranged in the grouting section 3 and above the isolation plate 6, the bottom of the stiffening rib plate 9 is fixedly connected with the upper surface of the isolation plate 6, and the side part of the stiffening rib plate 9 is fixedly connected with the inner side wall of the steel pipe pile body 2, so that the connection between the isolation plate 6 and the steel pipe pile body 2 is enhanced.

Referring to fig. 5, the stiffening ribs 9 are in the shape of a grid. In order to ensure that the stress of the stiffening rib plate 9 is uniform, the stiffening rib plate 9 is of a centrosymmetric structure.

Further, the steel pipe pile body 2 and the isolation plate 6 are connected by welding, and the stiffening rib plates 9 are connected by welding with the steel pipe pile body 2 and the isolation plate 6.

The invention also discloses a jacket foundation construction process of the steel pipe pile structure, which comprises the following steps:

(1) driving the steel pipe pile body 2 to a preset pile top elevation 10, and enabling the grouting section 3 of the steel pipe pile body 2 to be below a mud surface line 5;

(2) hoisting the jacket 1 by using hoisting equipment and lowering the jacket to ensure that the jacket legs 4 extend into the grouting section 3 of the steel pipe pile body 2 until the jacket legs abut against the isolation plate 6;

(3) and pouring concrete into the grouting section 3 of the steel pipe pile body 2, so that the outer wall of the jacket supporting leg 4 is connected with the inner wall of the steel pipe pile body 2 through the poured concrete.

The jacket foundation construction process can be applied to offshore engineering, avoids underwater pile cleaning construction, solves the problem that a diver or an underwater robot needs to be used for underwater pile cleaning in the traditional offshore steel pipe pile construction, saves construction cost, shortens construction period, reduces construction procedures and reduces the risk of offshore construction; meanwhile, the grouting section is ensured to be positioned below the mud surface line, and compared with the technical scheme of grouting on the mud surface line, the grouting section is more favorable for structural safety, reduces the construction cost and reduces the steel consumption of steel. The jacket foundation construction process is suitable for steel pipe pile engineering needing underwater grouting and has good applicability in offshore wind power engineering.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (2)

1. The steel pipe pile structure is characterized by comprising a steel pipe pile body, wherein a partition plate is arranged inside the steel pipe pile body and is perpendicular to the axial direction of the steel pipe pile body, and the steel pipe pile body is divided into a grouting section and a mud entering section which are isolated from each other by the partition plate; the lateral wall of steel-pipe pile body in go into mud section department and seted up a plurality of pile body trompil, the pile body trompil is close to the division board sets up and locates the division board below, the pile body trompil is followed the radial and axial evenly distributed of steel-pipe pile body, the division board with be equipped with stiffening rib plate between the steel-pipe pile body, stiffening rib plate set up in the grout section on the division board, stiffening rib plate's bottom with the last fixed surface of division board is connected, stiffening rib plate's lateral part with the inside wall fixed connection of steel-pipe pile body, stiffening rib plate is the grid form, stiffening rib plate is central symmetry structure, the steel-pipe pile body with be welded connection between the division board, stiffening rib plate with the steel-pipe pile body be welded connection between the division board.

2. A jacket foundation construction process using the steel pipe pile structure according to claim 1, comprising the steps of:

(1) driving the steel pipe pile body to a preset pile top elevation, and enabling the grouting section of the steel pipe pile body to be located below a mud level;

(2) hoisting a jacket by using hoisting equipment and putting down the jacket, so that jacket support legs extend into the grouting section of the steel pipe pile body until the jacket support legs abut against the isolation plate;

(3) and pouring concrete into the grouting section of the steel pipe pile body.

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