Construction method for grout stopping at bottom of foundation connecting section of offshore wind power jacket

Abstract

The invention discloses an offshore wind power jacket foundation connection section bottom grout stopping construction method which comprises the steps that a grout stopping groove is formed in the inner wall of a steel pipe pile, then a steel cover plate is installed on the grout stopping groove, and the steel cover plate is composed of a circular top plate, an outer side annular vertical plate, an inner side annular vertical plate, rib plates and lifting points. The grout stopping groove is meshed with the outer side annular vertical plate and the inner side annular vertical plate of the steel cover plate, the gap between the grout stopping groove and the steel cover plate is filled with the fine sand, the grouting space with the sealed bottom end is formed, the sealing grout stopping effect is good, and therefore the grout stopping purpose is achieved. The grout stopping groove and the steel cover plate are arranged in the steel pipe pile and located below the jacket main leg, and the steel cover plate cannot be damaged in the jacket mounting process; according to the invention, continuous grouting operation is ensured, slurry leakage is avoided, the grouting quality of the connecting section can be ensured, and the grouting efficiency and reliability are improved.

Description

Technical Field

[0001] The invention relates to the field of offshore wind power construction, and in particular to a construction method for stopping grout at the bottom of an offshore wind power conduit foundation connection section. Background Art

[0002] During the construction of the wind turbine jacket foundation, after the jacket is installed, grouting is performed on the connection section between the jacket and the steel pipe pile to anchor the jacket and the steel pipe pile together. Since the steel pipe pile is a hollow structure, grouting measures must be taken at the bottom of the jacket when grouting the connection section.

[0003] The conventional method of stopping grouting at the bottom of the connection section of the jacket foundation is to set a rubber sealing ring at the bottom of the main leg of the jacket. However, during the installation and insertion of the steel pipe piles, the rubber sealing ring will collide and rub against the inner wall of the steel pipe piles, and the sealing ring will often be damaged or completely fail, so the stopping effect and the grouting quality of the connection section cannot be guaranteed. Therefore, it is necessary to combine the characteristics of the grouting construction of the jacket foundation connection section to invent a construction method for stopping grouting at the bottom of the connection section that has a good stopping effect, can ensure the grouting quality of the connection section, is convenient to construct, and is safe and reliable. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for stopping grouting at the bottom of an offshore wind turbine conduit foundation connection section, which has good grouting stopping effect, can ensure the grouting quality of the connection section, is convenient to construct, and is safe and reliable. A grouting stopping groove is set in a steel pipe pile, and then a steel cover plate is installed and the seams are filled with fine sand to form a sealed grouting space at the bottom, thereby achieving the purpose of stopping grouting, ensuring that the grouting operation is carried out continuously without leakage, and improving the grouting efficiency and reliability.

[0005] The object of the present invention is achieved in that: A construction method for stopping grout at the bottom of an offshore wind power conduit foundation connection section, characterized by the following specific steps: A. Before the steel pipe pile is sunk into the seabed, an annular grout-stopping groove is installed on the inner wall of the steel pipe pile. The horizontal plate of the grout-stopping groove is fixed to the inner wall of the steel pipe pile by continuous welding, and the vertical plate of the grout-stopping groove faces the top of the steel pipe pile; B. Eight brackets are evenly arranged below the grout-stopping groove. The oblique brackets are welded and fixed to the horizontal plate of the grout-stopping groove and the inner wall of the steel pipe pile respectively; C. A steel cover plate is made for each steel pipe pile. The steel cover plate consists of a circular top plate, an outer annular vertical plate, an inner annular vertical plate, rib plates and hanging points. The outer annular vertical plate is arranged at the bottom edge of the circular top plate, the inner annular vertical plate is arranged at the bottom of the circular top plate and the inner side of the outer annular vertical plate, a number of rib plates are arranged at the bottom of the circular top plate, and four hanging points are evenly arranged at the top edge of the circular top plate; D. After the steel pipe piles are sunk into the seabed, the steel cover is lifted by the crawler crane on the drilling platform. Four equal-length steel wire ropes are used to connect the four lifting points on the top surface of the steel cover. Four main steel wire ropes are connected above the four equal-length steel wire ropes to ensure that the steel cover is in a horizontal state after lifting; E. Slowly lower the steel cover plate to the inside of the steel pipe pile until it falls on the grout-stopping groove. When the installation is completed, the vertical plate of the grout-stopping groove is located between the outer annular vertical plate and the inner annular vertical plate of the steel cover plate, and the top surface elevation of the steel cover plate is 0.2m below the bottom of the main leg of the jacket; F. Arrange divers to enter the steel pipe pile and use fine sand to fill the gap between the steel cover plate and the inner wall of the steel pipe pile. At this point, a sealed grouting space is formed from the steel cover plate to the top of the steel pipe pile, completing the grouting work at the bottom of the connection section.

[0006] Furthermore, in step C, the diameter of the steel cover plate is between the inner diameter of the steel pipe pile and the outer diameter of the vertical plate of the grout-stopping groove, and the distance between the outer annular vertical plate and the inner annular vertical plate is greater than the thickness of the vertical plate of the grout-stopping groove.

[0007] Furthermore, in step C, the number of ribs is four, and the four ribs are arranged in a "well" shape at the bottom of the circular top plate, and both ends of the four ribs are fixedly connected to the inner wall of the inner annular vertical plate 7.

[0008] Compared with the prior art, the advantages of the present invention are: 1. By setting a grout-stopping groove on the inner wall of the steel pipe pile, and then installing a steel cover plate on the grout-stopping groove, the grout-stopping groove and the outer annular vertical plate and the inner annular vertical plate of the steel cover plate are engaged with each other, and fine sand is filled in the gap between the grout-stopping groove and the steel cover plate to form a sealed grouting space at the bottom, with good sealing and grout-stopping effect, thereby achieving the purpose of grout-stopping; 2. The steel cover plate for stopping slurry at the bottom of the connection section of the present invention is located below the main leg of the jacket, and the jacket installation process will not cause damage to the steel cover plate; 3. Ensure that the grouting operation is carried out continuously without leakage, which can ensure the grouting quality of the connecting section and improve the grouting efficiency and reliability; 4. The construction is convenient, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the construction drawing of the grouting steps A and B at the bottom of the connection section; Figure 2 This is the construction drawing of the grouting steps C and D at the bottom of the connection section; Figure 3 This is the construction drawing of step E of grouting at the bottom of the connection section; Figure 4 This is the construction drawing of step F of grouting at the bottom of the connection section; Figure 5 It is a top view of the steel cover; Figure 6 This is a bottom view of the steel cover. DETAILED DESCRIPTION

[0010] The present invention will be further described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0011] Combined with Figure 1-4 A construction method for stopping grout at the bottom of an offshore wind power pipe frame foundation connection section, the specific steps are as follows: A. Before the steel pipe pile 1 is sunk into the seabed, an annular grout-stopping groove 2 is installed on the inner wall of the steel pipe pile 1. The horizontal plate 21 of the grout-stopping groove 2 is fixed to the inner wall of the steel pipe pile 1 by continuous welding, and the vertical plate 22 of the grout-stopping groove 2 faces the top of the steel pipe pile 1; B. Eight brackets 3 are evenly arranged below the grout-stopping groove 2. The oblique brackets 3 are welded and fixed to the horizontal plate of the grout-stopping groove 2 and the inner wall of the steel pipe pile 1; C. A steel cover plate 4 is made for each steel pipe pile 1. The steel cover plate 4 consists of a circular top plate 5, an outer annular vertical plate 6, an inner annular vertical plate 7, ribs 8 and hanging points 9. The outer annular vertical plate 6 is arranged at the bottom edge of the circular top plate 5, the inner annular vertical plate 7 is arranged at the bottom of the circular top plate 5 and the inner side of the outer annular vertical plate 6, four ribs 8 are arranged in a "well" shape at the bottom of the circular top plate 5, and both ends of the four ribs 8 are fixedly connected to the inner wall of the inner annular vertical plate 7, and four hanging points 9 are evenly arranged at the top edge of the circular top plate 5; the diameter of the steel cover plate 4 is between the inner diameter of the steel pipe pile 1 and the outer diameter of the vertical plate 22 of the grout-stopping groove 2, and the distance between the outer annular vertical plate 6 and the inner annular vertical plate 7 is greater than the thickness of the vertical plate 22 of the grout-stopping groove 2; D. After the steel pipe pile 1 is sunk into the seabed, the steel cover plate 4 is lifted by the crawler crane 11 on the drilling platform 10, and four equal-length steel wire ropes 12 are used to connect the four lifting points 9 on the top surface of the steel cover plate 4. Four main steel wire ropes 13 are connected above the four equal-length steel wire ropes 12 to ensure that the lifted steel cover plate 4 is in a horizontal state; E. Slowly lower the steel cover plate 4 to the inside of the steel pipe pile 1 until the steel cover plate 4 falls on the grout-stopping groove 2. When the installation is completed, the vertical plate of the grout-stopping groove 2 is located between the outer annular vertical plate 6 and the inner annular vertical plate 7 of the steel cover plate 4, and the top surface elevation of the steel cover plate 1 is 0.2m below the bottom of the main leg 15 of the jacket. F. Arrange divers to enter the steel pipe pile 1 and use fine sand 14 to fill the gap between the steel cover plate 4 and the inner wall of the steel pipe pile 1. At this point, a bottom-sealed grouting space is formed from the steel cover plate 4 to the top of the steel pipe pile 1, completing the grouting work at the bottom of the connecting section.

[0012] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention.

Claims

1. A construction method for stopping grout at the bottom of an offshore wind power pipe frame foundation connection section, characterized in that: The specific steps are as follows: A. Before the steel pipe pile is sunk into the seabed, an annular grout-stopping groove is installed on the inner wall of the steel pipe pile. The horizontal plate of the grout-stopping groove is fixed to the inner wall of the steel pipe pile by continuous welding, and the vertical plate of the grout-stopping groove faces the top of the steel pipe pile; B. Eight brackets are evenly arranged below the grout-stopping groove. The oblique brackets are welded and fixed to the horizontal plate of the grout-stopping groove and the inner wall of the steel pipe pile respectively; C. A steel cover plate is made for each steel pipe pile. The steel cover plate consists of a circular top plate, an outer annular vertical plate, an inner annular vertical plate, rib plates and hanging points. The outer annular vertical plate is arranged at the bottom edge of the circular top plate, the inner annular vertical plate is arranged at the bottom of the circular top plate and the inner side of the outer annular vertical plate, a number of rib plates are arranged at the bottom of the circular top plate, and four hanging points are evenly arranged at the top edge of the circular top plate; D. After the steel pipe piles are sunk into the seabed, the steel cover is lifted by the crawler crane on the drilling platform. Four equal-length steel wire ropes are used to connect the four lifting points on the top surface of the steel cover. Four main steel wire ropes are connected above the four equal-length steel wire ropes to ensure that the steel cover is in a horizontal state after lifting; E. Slowly lower the steel cover plate to the inside of the steel pipe pile until it falls on the grout-stopping groove. When the installation is completed, the vertical plate of the grout-stopping groove is located between the outer annular vertical plate and the inner annular vertical plate of the steel cover plate, and the top surface elevation of the steel cover plate is 0.2m below the bottom of the main leg of the jacket; F. Arrange divers to enter the steel pipe pile and use fine sand to fill the gap between the steel cover plate and the inner wall of the steel pipe pile. At this point, a sealed grouting space is formed from the steel cover plate to the top of the steel pipe pile, completing the grouting work at the bottom of the connection section. Construction method for grouting at the bottom of the connection section of the offshore wind turbine conduit foundation.

2. The construction method of the bottom grouting of the offshore wind power conduit foundation connection section according to claim 1 is characterized by: In step C, the diameter of the steel cover plate is between the inner diameter of the steel pipe pile and the outer diameter of the vertical plate of the grout-stopping groove, and the distance between the outer annular vertical plate and the inner annular vertical plate is greater than the thickness of the vertical plate of the grout-stopping groove.

3. The construction method of the bottom grouting of the offshore wind power conduit foundation connection section according to claim 1 is characterized by: In step C, the number of ribs is four, and the four ribs are arranged in a "well" shape at the bottom of the circular top plate, and both ends of the four ribs are fixedly connected to the inner wall of the inner annular vertical plate 7.

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