阅读说明：本技术 一种重力式劲性复合吸力式沉箱基础 (Gravity type stiffness composite suction type caisson foundation ) 是由 戴国亮 朱文波 龚维明 高鲁超 郭庆 郭晶 于 2019-09-03 设计创作，主要内容包括：本发明涉及一种重力式劲性复合吸力式沉箱基础,包括吸力式沉箱基础、顶部预制混凝土重块与水泥土固体组成重力式劲性复合吸力式沉箱基础。所述吸力式沉箱基础的下端开口,且上端设置有封盖,所述封盖上设置有导缆孔以及排水阀,所述排水阀与吸力式沉箱基础的内腔相连通；所述吸力式沉箱基础顶部设有混凝土重块。本发明通过吸力式沉箱基础下沉前的地基处理,使吸力式沉箱基础与水泥土固体形成整体,并在吸力式沉箱基础顶部设有预制混凝土重块,达到提高吸力式沉箱基础的竖向与水平承载能力。(The invention relates to a gravity type stiffness composite suction type caisson foundation which comprises a suction type caisson foundation, wherein a gravity type stiffness composite suction type caisson foundation is formed by a top precast concrete weight and a cement soil solid. The lower end of the suction caisson foundation is provided with an opening, the upper end of the suction caisson foundation is provided with a sealing cover, the sealing cover is provided with a cable guide hole and a drain valve, and the drain valve is communicated with the inner cavity of the suction caisson foundation; and a concrete weight is arranged at the top of the suction caisson foundation. According to the invention, the suction type caisson foundation and the cement soil solid are integrated through foundation treatment before the suction type caisson foundation sinks, and the precast concrete weight is arranged at the top of the suction type caisson foundation, so that the vertical and horizontal bearing capacity of the suction type caisson foundation is improved.)

1. A gravity type stiffness composite suction type caisson foundation is characterized in that: the concrete weight type caisson comprises a suction type caisson foundation (1), a precast concrete weight (2) positioned at the top of the suction type caisson foundation (1), and a cement soil reinforcing body (12) wrapping the outer surface of the suction type caisson foundation (1); wherein the suction caisson foundation (1) and the cement soil block (12) form a whole; the suction type caisson foundation (1) is in a cylindrical shape, the upper end of the caisson foundation (1) is provided with a sealing cover (3), and the lower end of the caisson foundation is provided with an opening; the sealing cover (3) is provided with a drain valve (11) and a steel bar (6), the steel bar (6) and the sealing plate (3) are welded and embedded in the precast concrete weight block (2), so that the precast concrete weight block (2) and the lower suction type caisson foundation (1) are integrated; the top of the steel column (5) is provided with a cable guide hole (4); the drain valve (11) is communicated with the inner cavity of the suction caisson foundation (1), and the other end of the drain valve is fixedly connected with the drain channel (8); the drainage channel (8) is arranged in the inner cavity of the steel pipe sleeve (7).

2. A gravity type stiff composite suction caisson foundation as claimed in claim 1, wherein: a steel column (5) is arranged on the sealing cover (3); the height of the steel column (5) is more than or equal to the height of the pre-support concrete weight (2); wherein the upper part of the steel column (5) is fixedly connected with the cable guide hole (4).

3. A gravity type stiff composite suction caisson foundation as claimed in claim 1, wherein: the height of the steel bar (6) is lower than that of the precast concrete weight (2), and the diameter of the steel bar (6) is smaller than that of the suction caisson foundation (1); the shape of the reinforcing steel bar (6) is round or any other shape.

4. A gravity type stiff composite suction caisson foundation as claimed in claim 1, wherein: the diameter of the precast concrete weight (2) is larger than or equal to that of the suction type caisson foundation (1).

5. A gravity type stiff composite suction caisson foundation as claimed in claims 1 and 4, wherein: when the diameter of the precast concrete weight (2) is larger than that of the suction type caisson foundation (1), a steel plate (10) is precast at the lower end of the precast concrete weight (2), wherein the lower end of the steel plate (10) is fixedly connected with a sealing cover (3) of the suction type caisson foundation (1).

6. A gravity type stiff composite suction caisson foundation as claimed in claim 5, wherein: and the upper end of the steel plate (10) is provided with a steel bar (6) for fixing the precast concrete weight (2).

7. A gravity type stiff composite suction caisson foundation as claimed in claim 1, wherein: the outer surface of the cement soil reinforcing body (12) is in a square shape and a cylinder shape.

8. A gravity type stiff composite suction caisson foundation as claimed in claim 1, wherein: the length or the diameter of the cross section of the cement soil reinforcing body (12) is 1.0-2.0 times of the diameter of the suction type caisson foundation (1).

9. A gravity type stiff composite suction caisson foundation as claimed in claim 1, wherein: the depth of the cement soil reinforcing body (12) is not less than the height of the suction type caisson foundation (1).

10. A preparation method of a gravity type stiff composite suction type caisson foundation is characterized by comprising the following steps: the construction method comprises the following steps: (1) the precast concrete weight block at the top of the precast gravity type suction caisson foundation is precast on the bank and is formed with the suction type caisson foundation; (2) carrying out foundation construction on the cement soil reinforcement body; (3) after the cement soil solid construction is finished, the gravity type suction caisson foundation is installed in the range of the cement soil reinforcing body, the gravity type suction caisson foundation is installed in a negative pressure sinking mode, and when the suction type caisson foundation sinks, the suction type caisson foundation and the surrounding cement soil solid form a whole and then begin to bear load.

Technical Field

The invention relates to the field of floating offshore platforms and offshore floating fan anchoring foundations, in particular to a gravity type stiff composite suction type caisson foundation and a preparation method thereof.

Background

The suction caisson foundation is a common foundation form of an offshore wind power foundation and an offshore platform. Because the shallow soil body mostly takes silt and silt soil as main materials, the soil quality is relatively poor, and the bearing characteristic of the suction caisson foundation is greatly influenced by the shallow soil body. Meanwhile, under the complex marine environment, under the influence of factors such as wind, waves and currents and the long-term uplift load effect, the suction type caisson foundation generates larger horizontal and vertical bearing capacity and displacement, and the safety of the upper structure is threatened.

The suction type caisson foundation is used as a novel floating type offshore wind turbine foundation form, and the requirement of wind turbine construction in the deep sea field is met. The construction method is that the caisson foundation reaches a certain depth in advance under the action of self weight and negative pressure, and when the suction caisson foundation is acted by vertical load, the uplift bearing capacity mainly depends on the friction between the wall of the caisson and the soil body and the self weight of the foundation, and the bearing capacity is lower.

Disclosure of Invention

The invention provides a gravity type stiff composite suction type caisson foundation and a preparation method thereof, aiming at the problem that the pull-out bearing capacity of a suction type caisson foundation is low, and the vertical pull-out bearing capacity of the suction type caisson foundation is greatly improved.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the invention provides a gravity type stiff composite suction type caisson foundation which comprises a suction type caisson foundation, a precast concrete weight block and a cement soil reinforcing body, wherein the precast concrete weight block is positioned at the top of the suction type caisson foundation; wherein the suction caisson foundation and the cement soil block form a whole; the suction type caisson foundation is cylindrical, and the suction type caisson foundation is characterized in that the upper end of the caisson foundation is provided with a sealing cover and the lower end of the caisson foundation is provided with an opening; the sealing cover is provided with a drain valve and a steel bar, the steel bar and the sealing plate are welded and embedded in the precast concrete weight block, so that the precast concrete weight block and the lower suction type caisson foundation are integrated; the vertical and horizontal bearing capacity of the suction caisson foundation is improved.

The top of the steel column is provided with a cable guide hole; the drainage valve is communicated with the inner cavity of the suction caisson foundation, and the other end of the drainage valve is fixedly connected with the drainage channel; the drainage channel is arranged in the inner cavity of the steel pipe sleeve.

The invention is further improved in that: a steel column is arranged on the sealing cover; the height of the steel column is greater than or equal to that of the pre-support concrete weight; and the upper part of the steel column is fixedly connected with the cable guide hole.

The invention is further improved in that: the height of the steel bar is lower than that of the precast concrete weight, and the diameter of the steel bar is smaller than that of the suction caisson foundation; the shape of the reinforcing steel bar is round or any other shape.

The invention is further improved in that: the diameter of the precast concrete weight is larger than or equal to that of the suction type caisson foundation.

The invention is further improved in that: and when the diameter of the precast concrete weight block is larger than that of the suction caisson foundation, prefabricating a steel plate at the lower end of the precast concrete weight block, wherein the lower end of the steel plate is fixedly connected with a sealing cover of the suction caisson foundation.

The invention is further improved in that: and the upper end of the steel plate is provided with a steel bar for fixing the precast concrete weight.

The invention is further improved in that: the outer surface of the cement soil reinforcing body is in a square shape and a cylinder shape.

The invention is further improved in that: the length or the diameter of the cross section of the cement soil reinforcement body is 1.0-2.0 times of the diameter of the base of the suction type caisson.

The invention is further improved in that: the depth of the cement soil reinforcing body is not less than the height of the suction type caisson foundation.

A preparation method of a gravity type stiff composite suction type caisson foundation comprises the following steps: (1) the precast concrete weight block at the top of the precast gravity type suction caisson foundation is precast on the bank and is formed with the suction type caisson foundation; (2) carrying out foundation construction on the cement soil reinforcement body; (3) after the cement soil solid construction is finished, the gravity type suction caisson foundation is installed in the range of the cement soil reinforcing body, the gravity type suction caisson foundation is installed in a negative pressure sinking mode, and when the suction type caisson foundation sinks, the suction type caisson foundation and the surrounding cement soil solid form a whole and then begin to bear load.

Compared with the prior art, the invention has the following beneficial effects:

the cement soil reinforcing body and the suction type caisson foundation are combined to act, so that the horizontal bearing capacity and the vertical bearing capacity of the suction type caisson foundation are improved, and the horizontal deformation and the vertical deformation of the suction type caisson foundation are reduced; the invention can reduce the cost of offshore wind power engineering, improve the engineering efficiency and ensure the integral stability of the fan structure.

Drawings

FIG. 1: is a schematic structural diagram of embodiment 1 of the present invention;

FIG. 2: is a schematic structural diagram of embodiment 2 of the present invention;

reference numerals: 1-a suction caisson foundation; 2-precast concrete weight block; 3-sealing the cover; 4-a cable guide hole; 5-steel column; 6-reinforcing steel bars; 7-steel casing pipe; 8-a drainage channel; 9-connecting pipe, 10-steel plate, 11-drain valve and 12-cement soil reinforcing block.

Detailed Description

The invention is further elucidated with reference to the drawings and the detailed description.

A gravity type stiff composite suction type caisson foundation comprises a suction type caisson foundation 1, a precast concrete weight 2 positioned at the top of the suction type caisson foundation 1, and a cement soil reinforcing body 12 wrapping the outer surface of the suction type caisson foundation 1; wherein the suction caisson foundation 1 and the cement soil block 12 form a whole; the suction type caisson foundation 1 is cylindrical, and the suction type caisson foundation 1 is characterized in that the upper end of the caisson foundation 1 is provided with a sealing cover 3 and the lower end of the caisson foundation is provided with an opening; the seal cover 3 is provided with a drain valve 11 and a steel bar 6, and the steel bar 6 and the seal plate 3 are welded and embedded in the precast concrete weight block 2, so that the precast concrete weight block 2 and the lower suction type caisson foundation 1 are integrated; the top of the steel column 5 is provided with a cable guide hole 4; the drain valve 11 is communicated with the inner cavity of the suction caisson foundation 1, and the other end of the drain valve is fixedly connected with the drain channel 8; the drainage channel 8 is arranged in the inner cavity of the steel pipe sleeve 7.

A steel column 5 is arranged on the sealing cover 3; the height of the steel column 5 is greater than that of the pre-support concrete weight 2; wherein the upper part of the steel column 5 is fixedly connected with the cable guide hole 4.

The height of the steel bar 6 is lower than that of the precast concrete weight 2, and the diameter of the steel bar 6 is smaller than that of the suction caisson foundation 1; the shape of the reinforcing steel bar 6 is circular.