A construction method for high-strength consolidation repair of offshore wind power pile foundation

Abstract

The present invention discloses a construction method for a high-strength consolidation repair structure for an offshore wind power pile foundation, comprising: a hoisting repair ring is fixed above the damaged part of the wind power pile foundation, and the grouting holes arranged on the repair ring face the construction vessel; a striking device is used to pierce the wind power pile foundation at the corresponding position of the grouting hole of the repair ring 1, forming a gap close to the size of the grouting hole; the construction vessel connects a high-strength consolidation slurry pipeline to the grouting hole, and pours high-strength consolidation slurry into the wind power pile foundation; the high-strength consolidation slurry is poured until the slurry overflows the grouting hole and stops; after the grouting is completed, the grouting pipeline is recovered and the repair ring is rotated to a certain position and then fixed again to ensure that the material gap on the wind power pile foundation is completely staggered with the grouting hole. The repair ring of the present invention has a simple structure, fast manufacturing speed, and low cost, and can quickly produce a corresponding repair device according to the damaged part when the offshore wind power foundation is damaged.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore wind power foundations, and in particular relates to a construction method for high-strength consolidation repair of offshore wind power pile foundations. Background Art

[0002] Energy issues are key issues that determine the sustainable development of human society, and are also important issues for the social and economic development of our country. As a renewable green energy that has formed a mature industrial chain, offshore wind power has been accepted and recognized by countries around the world. China has now become the world's largest offshore wind power market, and the later operation and maintenance issues of offshore wind power have gradually shown their importance. Offshore wind farms are usually difficult to operate and maintain, with high operation and maintenance costs and high demand for special engineering vessels. In the event of occasional damage to the wind turbine foundation, if the wind turbine foundation cannot be repaired in time, it will have a significant impact on the economic benefits of the offshore wind farm. How to safely and quickly repair the offshore wind power foundation so that it can operate normally is a key technical issue.

[0003] The existing offshore wind power foundation repair technology mainly adds clamps to ensure that the bearing capacity of the damaged part does not reach the limit, but this type of clamp technology is derived from the offshore oil platform repair technology, and there is no clear proof whether it can be applied to the repair of offshore wind power foundations. In addition, the addition of clamps cannot guarantee the inward-type secondary damage of the damaged part, cannot guarantee the impact of the damaged part on other parts, and has a small protection range, which is not suitable for repairing large-scale damage. The present invention proposes a construction method for a high-strength consolidation repair structure for offshore wind power pile foundations, which quickly repairs offshore wind power foundations by opening holes in a small area and injecting high-strength consolidation slurry through a protective structure. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, the present invention quickly repairs the offshore wind power pile foundation by opening holes in a small area and injecting high-strength consolidation slurry through a protective structure, so that the interior of the wind power pile foundation changes from hollow to solid, which can ensure that the repaired wind power pile foundation will not cause secondary damage in the future and further reinforce the wind power foundation.

[0005] A construction method for high-strength consolidation repair structure of offshore wind power pile foundation, the specific construction steps are as follows:

[0006] S1: The hoisting repair ring is fixed at a position above the damaged part of the wind turbine pile foundation that is not affected by the damage, and the grouting holes on the repair ring that are used to cooperate with the grouting pipe to grout into the wind turbine pile foundation face the construction vessel;

[0007] S2: Use a striking device to punch through the wind power pile foundation at the position corresponding to the grouting hole of the repair ring 1, forming a gap close to the size of the grouting hole;

[0008] S3: The construction vessel connects the high-strength consolidation slurry pipeline to the grouting hole, and pours the high-strength consolidation slurry into the wind turbine pile foundation;

[0009] S4: The high-strength consolidation slurry is poured until the slurry overflows the grouting hole;

[0010] S5: After the grouting is completed, the grouting pipe is recovered and the repair ring is rotated to a certain position and then fixed again to ensure that the material passage gap on the wind power pile foundation is completely staggered with the grouting hole.

[0011] Furthermore, the repair ring is fixed on the wind power pile foundation by fasteners.

[0012] Furthermore, the grouting hole extends away from one end of the wind power pile foundation to be repaired to form a convex diameter for fixing the grouting pipeline during the repair process.

[0013] Furthermore, the repair ring is a hoop structure.

[0014] Furthermore, the repair ring includes two semicircular hoops, and the connection points at both ends of the two semicircular hoops are fixed by fasteners.

[0015] Furthermore, the fastener includes a wing plate fixed on the repair ring and a screw assembly or a bolt assembly for fixing the wing plate.

[0016] Furthermore, an anti-corrosion coating is provided on the surface of the repair ring.

[0017] Compared with the prior art, the present invention has the following advantages: (1) The repair ring has a simple structure, fast manufacturing speed and low cost. When the offshore wind power foundation is damaged, the corresponding repair device can be quickly produced according to the damaged part, which is of great significance to the rapid recovery of offshore wind turbines; (2) The high-strength consolidation repair process of the present invention has higher safety performance than the traditional clamp repair, which can ensure that the repaired foundation will not cause secondary damage in the future and further reinforce the wind power foundation, thereby reducing the average cost of offshore wind power foundation operation and maintenance; (3) The high-strength consolidation repair process of the present invention has a fast repair speed as a whole and a low construction difficulty, which reduces the safety threat caused by long-term stay of offshore construction and provides a certain guarantee for the safety of offshore wind power construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the present invention;

[0019] Figure 2 This is a schematic diagram of the repair ring in the present invention in use state;

[0020] Figure 3 Schematic diagram of the repair ring structure in the present invention.

[0021] In the figure: 1-repair ring, 2-grouting hole, 21-convex diameter, 3-fastener, 31-wing plate, 4-wind power pile foundation, 5-damaged part. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1-3 As shown, the damaged portion 5 on the wind power pile foundation 4 is an inwardly concave damage. When repairing the damaged portion 5, a repair ring 1 is arranged above the damaged portion 5 of the wind power pile foundation 4. After the repair ring 1 is fixed, the grouting holes 2 on the repair ring 1 face the construction vessel to ensure the convenience of construction. The grouting changes the interior of the wind power pile foundation 4 from hollow to solid, which can ensure that the repaired wind power pile foundation 4 will not cause secondary damage in the future and further reinforce the wind power foundation.

[0024] The specific construction method for high-strength consolidation repair structure of offshore wind power pile foundation is as follows:

[0025] S1: The repair ring 1 is hoisted and fixed to a position above the damaged part 5 on the wind power pile foundation 4 that is not affected by the damage, and the grouting holes 2 provided on the repair ring 1 for cooperating with the grouting pipe to grout into the wind power pile foundation 4 are facing the construction vessel;

[0026] S2: Use a striking device to punch through the wind power pile foundation 4 at the position corresponding to the grouting hole 2 of the repair ring 1, so as to form a gap close in size to the grouting hole 2;

[0027] S3: The construction vessel connects the high-strength consolidation slurry pipeline to the grouting hole 2, and pours the high-strength consolidation slurry into the wind power pile foundation 4;

[0028] S4: The high-strength consolidation slurry is poured until the slurry overflows the grouting hole 2 and stops;

[0029] S5: After the grouting is completed, the grouting pipe is recovered and the repair ring 1 is rotated to a certain position and then fixed again to ensure that the material passage gap on the wind power pile foundation 4 is completely staggered with the grouting hole 2.

[0030] In addition, the slurry is a special slurry with high strength and rapid solidification underwater. After the slurry is poured in, it will be connected with the pile leg of the damaged part 5 to form a whole. The size of the gap in step S2 must be much smaller than the pile diameter, so the gap will not have a significant impact on the foundation; the slurry overflowing the grouting hole 2 in step S4 can be judged by the change of the grouting pressure of the grouting machine, or by whether there is grout overflow in the grouting hole 2.

[0031] Specifically, the repair ring 1 is fixed on the wind power pile foundation 4 by a fastener 3, and the size of the grouting hole 2 on the repair ring 1 is set according to the size of the grouting pipe, which is slightly larger than the grouting pipe and can clamp the size of the grouting pipe. The repair ring 1 preferably has a clamp structure, including two semicircular clamps, and the two ends of the two semicircular clamps are fixed by fasteners 3; or it includes two semicircular clamps, one end of the two semicircular clamps is hinged, and the other end is fixed by fasteners 3. Specifically, a grouting hole 2 is set on one of the semicircular rings, and grouting holes 2 can also be set on both semicircular rings as needed to speed up the grouting speed. The fastener 3 includes a wing plate 31 fixed at both ends of the repair ring 1 and a screw assembly or bolt assembly that penetrates the wing plate 31 to fix the wing plate 31. In order to achieve the effect of rapid installation, the screw assembly or bolt assembly uses no more than three screws or bolts for fixing. The repair ring 1 can also be set to other structures as needed, but a grouting hole 2 for grouting needs to be set on the repair ring 1. The grouting hole 2 extends away from one end of the wind turbine pile foundation 4 to be repaired to form a convex diameter 21 for fixing the grouting pipe during the repair process. The repair ring 1 will stay on the wind turbine pile foundation 4 to be repaired after the repair construction is completed, so it is preferably made of the same or similar material as the repaired wind turbine pile foundation 4, and an anti-corrosion coating is sprayed on its surface to prevent damage to the repaired wind turbine pile foundation 4.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for high-strength consolidation repair of offshore wind power pile foundations, It is characterized in that The specific construction steps are as follows: S1: The repair ring (1) is hoisted and fixed to a position above the damaged part (5) on the wind turbine pile foundation (4) that is not affected by the damage, and the grouting holes (2) provided on the repair ring (1) for cooperating with the grouting pipe to grout into the wind turbine pile foundation (4) are facing the construction vessel; S2: using a striking device to punch through the wind power pile foundation (4) at a position corresponding to the grouting hole (2) of the repair ring (1), thereby forming a gap having a size close to that of the grouting hole (2); S3: The construction vessel connects the high-strength consolidation slurry pipeline to the grouting hole (2), and pours the high-strength consolidation slurry into the wind turbine pile foundation (4); S4: The high-strength consolidation slurry is poured until the slurry overflows the grouting hole (2) and stops; S5: After the grouting is completed, the grouting pipe is recovered and the repair ring (1) is rotated to a certain position and then fixed again to ensure that the material passage gap on the wind power pile foundation (4) is completely offset from the grouting hole (2); The grouting hole (2) extends outward from one end of the wind power pile foundation (4) to be repaired to form a convex diameter (21) for fixing the grouting pipeline during the repair process; the repair ring (1) is a hoop structure, and an anti-corrosion coating is provided on the surface of the repair ring (1).

2. A construction method for high-strength consolidation repair of offshore wind power pile foundation according to claim 1, It is characterized in that The repair ring (1) is fixed on the wind power pile foundation (4) via a fastener (3).

3. A construction method for high-strength consolidation repair of offshore wind power pile foundation according to claim 1, It is characterized in that The repair ring (1) comprises two semicircular hoops, and the connection points at both ends of the two semicircular hoops are fixed by fasteners (3).

4. A construction method for high-strength consolidation repair of offshore wind power pile foundation according to claim 3, It is characterized in that The fastener (3) comprises a wing plate (31) fixed on the repair ring (1) and a screw assembly or a bolt assembly for fixing the wing plate (31).

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