CN108661031B - Damaged grouting repair method for rod piece in guide pipe frame splashing area - Google Patents
Damaged grouting repair method for rod piece in guide pipe frame splashing area Download PDFInfo
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- CN108661031B CN108661031B CN201810426869.0A CN201810426869A CN108661031B CN 108661031 B CN108661031 B CN 108661031B CN 201810426869 A CN201810426869 A CN 201810426869A CN 108661031 B CN108661031 B CN 108661031B
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- grouting
- damaged
- jacket
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- rod
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0008—Methods for grouting offshore structures; apparatus therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0034—Maintenance, repair or inspection of offshore constructions
Abstract
The invention discloses a damaged grouting repair method for a rod piece in a jacket splash zone, which comprises the following steps of: s1, building a construction platform on the jacket; s2, forming a grouting hole and a vent hole in the damaged rod piece in the jacket splash zone; the grouting holes and the vent holes are positioned at the upper ends of the damaged rod pieces above the water surface; s3, connecting sand injection equipment on the construction platform with the injection holes, injecting sand into the damaged rod piece through the injection holes, and filling the bottom end of the damaged rod piece; s4, connecting grouting equipment on the construction platform with the grouting holes, and grouting cement slurry into the damaged rod piece until the vent holes overflow, and stopping grouting; and S5, when cement paste in the damaged rod piece is solidified, the grouting hole and the vent hole are plugged. According to the method for repairing damaged bar members in the splash zone of the jacket through grouting, disclosed by the invention, the grouting amount is reduced, the whole process is operated on water, the operation cost and risk are greatly reduced, and greater economic benefits are created.
Description
Technical Field
The invention relates to the technical field of marine oil engineering, in particular to a damaged grouting repair method for a rod piece in a jacket splash zone.
Background
The jacket is an important supporting foundation of offshore structures such as offshore oil platforms, offshore wind power platforms, offshore lighthouses and the like, is generally formed by welding hollow cylindrical leg posts and cylindrical longitudinal and transverse rod pieces for connecting the leg posts, has the characteristics of low construction cost, mature technology and the like, and is widely applied at home and abroad.
In the installation and service process of the jacket, the rod piece in the splashing area is most easily damaged in different degrees under the action of external force (ship collision, surge and the like), the damage form is more in the form of local depression, the mechanical property of the rod piece can be reduced due to the local depression, and the safety of the whole jacket is endangered. To ensure safe operation of the jacket, it is often necessary to repair the damaged rods.
The traditional method for repairing the damaged rod piece in the splash zone of the jacket is full grouting filling repair, a diver is required to operate the whole process underwater, the operation cost and risk are high, the economic benefit is low, the actual construction is difficult to realize the full filling in the true sense, and the maximum effectiveness cannot be realized.
Disclosure of Invention
The invention aims to provide a method for repairing damaged bars in a splash zone of a jacket by grouting, which reduces the operation cost and risk.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for repairing damaged bar pieces in the splash zone of the jacket through grouting comprises the following steps:
s1, building a construction platform on the jacket;
s2, forming a grouting hole and a vent hole in the damaged rod piece in the jacket splash zone; the grouting holes and the vent holes are above the water surface and are positioned at the upper ends of the damaged rod pieces;
s3, connecting sand injection equipment on the construction platform with the injection holes, injecting sand into the damaged rod piece through the injection holes, and filling the bottom end of the damaged rod piece;
s4, connecting grouting equipment on the construction platform with the grouting holes, and grouting cement slurry into the damaged rod piece until the vent holes overflow, and stopping grouting;
and S5, when cement paste in the damaged rod piece is solidified, the grouting hole and the vent hole are plugged.
Preferably, in step S1, the construction platform is located on the jacket above the splash zone of the jacket or above the water level within the splash zone.
Preferably, in step S2, the slip casting holes and the vent holes are circumferentially staggered on the damaged rod piece by an angle of not less than 90 °; the distance between the grouting holes and the vent holes on the damaged rod piece is more than or equal to 300 mm.
Preferably, in step S2, a grouting hole is formed at a position where an included angle between a central axis of the hole and the gravity direction is smallest in the circumferential direction of the damaged rod.
Preferably, in step S3, the sand-injected sand has a sand grain size of 5-10 mm.
Preferably, in step S3, the sand filled in the damaged rod is located below the damaged area.
Preferably, in step S4, the cement paste covers the damaged area of the damaged rod piece inside the damaged rod piece.
Preferably, in step S4, during the grouting of the cement paste, the grouting is performed at a first grouting speed, and when the grouting is performed to the damaged area, the grouting speed is reduced, and the grouting is performed at a second grouting speed.
Preferably, in step S5, when the temperature of the cement slurry on the inner surface of the vent hole is consistent with the ambient temperature, the plugging operation is performed.
Preferably, after step S5, the surface of the damaged rod piece is cleaned, and a hole is repaired by build-up welding.
According to the method for repairing damaged grouting of the rod piece in the splash zone of the jacket, the grouting hole and the vent hole are formed in the overwater part of the damaged rod piece, the bottom of the damaged rod piece is filled with sand and then the grouting method is adopted, the grouting amount is reduced, the whole process is operated on the water, the operation cost and risk are greatly reduced, and great economic benefits are created.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a damaged rod member repaired by the damaged grouting repair method for the rod member in the splash zone of the jacket.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a method for repairing damaged bars in a splash zone of a jacket by grouting according to an embodiment of the present invention includes the following steps:
s1, a construction platform (not shown) is built on the jacket 10.
The construction platform is above its splash zone a on the jacket 10. Or the construction platform is arranged above the water surface at a position above the water surface in the splash zone A. The worker can perform subsequent operations such as boring, pouring, and repairing on the damaged rod member 20 on the construction platform.
In addition, the construction platform should be located above the water surface after considering waves and tides, and the specific position is mainly convenient for construction.
S2, forming grouting holes 21 and vent holes 22 on the damaged bars 20 in the splash zone a of the jacket 10.
The effective cement paste pouring length in the damaged rod piece 20 is determined through numerical analysis calculation, the effectiveness of repairing the sea pipe can be guaranteed within the effective cement paste pouring length, and a grouting hole 21 and an air vent 22 are formed in the appropriate position of the upper end of the damaged rod piece 20 according to the requirement of the effective cement paste pouring length. The operation of tapping is carried out on the water surface and is carried out by adopting a mechanical drilling mode.
The grouting holes 21 and the vent holes 22 are opened above the water surface and at the upper end of the damaged rod 20.
On the damaged rod piece 20, along the axial direction of the damaged rod piece 20, the vent hole 22 and the grouting hole 21 may be located above the vent hole 22 or above the grouting hole 21, and the positions of the vent hole 22 and the grouting hole 21 are not limited; and the vent hole 22 and the injection hole 21 are staggered a certain distance on the damaged rod member 20. The grouting holes 21 and the vent holes 22 are circumferentially staggered on the damaged rod piece 20 by an angle of more than or equal to 70 degrees, preferably more than or equal to 90 degrees. The axial distance between the grouting holes 21 and the vent holes 22 on the damaged rod 20 (the distance along the axial direction of the damaged rod 20) is not less than 200mm, preferably not less than 300 mm.
Preferably, the grouting hole 21 is formed at the position where the included angle between the central axis of the hole and the gravity direction is the smallest in the circumferential direction of the damaged rod 20, so as to facilitate subsequent sand and grout injection into the damaged rod 20 in the direction perpendicular to the water surface. Namely: the included angle between the central axis of the grouting hole 21 formed in the selected position and the gravity direction is smaller than the included angle between the central axis of the hole formed in the other position in the circumferential direction of the damaged rod member 20 and the gravity direction.
As shown in fig. 1, in the present embodiment, the injection holes 21 are located on the side of the damaged rod 20 facing away from the water surface.
The aperture sizes of the grouting holes 21 and the vent holes 22 are subject to the condition that the structure of the damaged rod 20 is not influenced and no potential safety hazard exists, and the smoothness of injection is ensured.
And S3, connecting the sand injection equipment on the construction platform with the injection holes 21, injecting sand into the damaged rod piece 20 through the injection holes 21, and filling the bottom end of the damaged rod piece 20.
Wherein, the sand injecting joint of the sand injecting equipment is butted with the grouting hole 21. The sand and stone for sand injection adopts medium coarse sand with the particle size of 5-10 mm. It is understood that the sand is not limited to a diameter of 5-10mm, and may be increased or decreased according to the diameter of the injection hole 21 to ensure that the sand can be injected into the damaged rod 20 through the injection hole 21. The sand is cleaned and dried before injection, so that mud and water in the sand are reduced, and the sand is prevented from being stuck together to influence the injection.
In combination with the location of the injection holes 21 on the damaged rod 20, on the side facing away from the water as shown in fig. 1, sand enters the damaged rod 20 in a vertical manner, and injection is more smooth.
The cement paste filling position in the vertical axis direction (along the axial direction of the damaged rod piece 20) of the damaged area is determined according to the natural stacking angle of sand in the damaged rod piece 20 and numerical calculation, so that the upper end position of sand injection (namely the highest sand injection line) is determined, and the sand injection amount is determined according to the natural stacking angle, the inner diameter of the damaged rod piece 20 and the upper end position of the sand injection.
The sand 30 filled in the damaged rod 20 is located below the damaged area (e.g., shown by the dashed box on the damaged rod 20) at a specified distance from the damaged area. Typically, the damaged area is located near the surface of the water on damaged rod 20, and sand 30 may fill the lower end or lower half of the damaged rod 20 depending on the location of the damaged area on the damaged rod 20.
After the sand injection is completed, the sand injection joint can be detached from the grouting hole 21.
And S4, connecting grouting equipment on the construction platform with the grouting holes 21, and grouting cement paste 40 (or concrete) into the damaged rod pieces 20 until the vent holes 22 overflow, and stopping grouting.
In combination with the location of the grout holes 21 on the damaged rod member 20, grout 40 enters the damaged rod member 20 in a vertical manner. During grouting, grout 40 is first placed over the sand 30 and then gradually filled along the axial direction of the damaged rod 20. Grout 40 covers the damaged area of damaged rod 20 within damaged rod 20 and extends to vent hole 22; along the axial direction of the damaged rod 20, cement paste is filled in a specified distance above and below the damaged area. The head space of damaged rod 20 above vent hole 22 is filled with air, leaving an air section, as grout fills up vent hole 22 and stops overflowing.
In the grouting process of cement paste, before the lower end of the damaged rod piece 20 is filled until the damaged area is covered, grouting at a first grouting speed; and when the cement slurry is poured into the damaged area, the pouring speed is reduced, and a second pouring speed is adopted for pouring, so that the bubbles in the cement slurry are fully volatilized, and the compactness after final setting is ensured. The second perfusion rate is less than the first perfusion rate.
The first pouring speed and the second pouring speed can be determined according to the aperture size of the grouting hole 21 and the grouting forming condition, so that air holes are prevented from being generated or reduced in the grouting process.
The connection of the grouting equipment to the grouting hole 21 can be disconnected after the grouting is completed.
S5, solidifying the cement paste 40 in the rod piece 20 to be damaged, and sealing the grouting hole 21 and the vent hole 22.
The final set time of the cement slurry 40 takes approximately 24 hours. And after the final setting time, measuring the temperature of the cement slurry on the inner surface of the vent hole 22, and plugging when the temperature of the cement slurry on the inner surface of the vent hole 22 is consistent with the ambient temperature.
After plugging is completed, the surface of the damaged rod piece 20 is cleaned, and holes are repaired by surfacing; then carrying out nondestructive testing to ensure the repair quality; further carrying out paint surface treatment.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A damaged bar grouting repair method in a jacket splash zone is characterized by comprising the following steps:
s1, building a construction platform on the jacket;
s2, forming a grouting hole and a vent hole in the damaged rod piece in the jacket splash zone; the grouting holes and the vent holes are above the water surface and are positioned at the upper ends of the damaged rod pieces;
s3, connecting sand injection equipment on the construction platform with the injection holes, injecting sand into the damaged rod piece through the injection holes, and filling the bottom end of the damaged rod piece;
s4, connecting grouting equipment on the construction platform with the grouting holes, and grouting cement slurry into the damaged rod piece until the vent holes overflow, and stopping grouting;
and S5, when cement paste in the damaged rod piece is solidified, the grouting hole and the vent hole are plugged.
2. The method for grouting repair of rod damage in a splash zone of a jacket according to claim 1, wherein in step S1, the construction platform is positioned above the splash zone of the jacket on the jacket; or the construction platform is positioned above the water surface in the splash zone on the jacket.
3. The method for repairing damaged bars in the splash zone of a jacket by grouting according to claim 1, wherein in step S2, the grouting holes and the vent holes are circumferentially staggered on the damaged bars by an angle of not less than 90 °; the axial distance between the grouting holes and the vent holes on the damaged rod piece is more than or equal to 300 mm.
4. The method for grouting repair of rod damage in a splash zone of a jacket according to claim 1, wherein in step S2, a grouting hole is formed at a position where an included angle between a central axis of the hole and a gravity direction is smallest in a circumferential direction of the damaged rod.
5. The method for repairing rod member damage in the splash zone of a jacket by grouting according to claim 1, wherein in step S3, the sand-injected sand has a sand grain size of 5-10 mm.
6. The method for grouting damage to a rod member in a splash zone of a jacket according to claim 1, wherein in step S3, the sand filled in the damaged rod member is located below the damaged area.
7. The method for grouting repair of rod damage in a jacket splash zone of claim 1, wherein the cement slurry covers a damaged area of the damaged rod within the damaged rod in step S4.
8. The method for grouting repair of rod member damage in pipe rack splash zone of claim 7, wherein in step S4, during grouting of cement paste, a first grouting speed is adopted, and when grouting to the damaged area, the grouting speed is reduced, and a second grouting speed is adopted.
9. The method for repairing the rod member damage in the splash zone of the jacket through grouting according to claim 1, wherein in step S5, when the temperature of the cement paste on the inner surface of the vent hole is consistent with the ambient temperature, the plugging operation is performed.
10. A jacket splash zone rod damage grouting repair method according to any one of claims 1 to 9, characterized in that after step S5, the surface of the damaged rod is cleaned, and holes are repaired by build-up welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810426869.0A CN108661031B (en) | 2018-05-07 | 2018-05-07 | Damaged grouting repair method for rod piece in guide pipe frame splashing area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810426869.0A CN108661031B (en) | 2018-05-07 | 2018-05-07 | Damaged grouting repair method for rod piece in guide pipe frame splashing area |
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| Publication Number | Publication Date |
|---|---|
| CN108661031A CN108661031A (en) | 2018-10-16 |
| CN108661031B true CN108661031B (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810426869.0A Active CN108661031B (en) | 2018-05-07 | 2018-05-07 | Damaged grouting repair method for rod piece in guide pipe frame splashing area |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1363743A (en) * | 2002-01-25 | 2002-08-14 | 胜利油田胜利石油化工建设有限责任公司 | Method and apparatus for grouting with guide pipe on offshore platform |
| WO2011160703A2 (en) * | 2010-06-23 | 2011-12-29 | Siemens Aktiengesellschaft | Jacket structure for offshore constructions |
| CN205046588U (en) * | 2015-09-08 | 2016-02-24 | 广东明阳风电产业集团有限公司 | Marine fan jacket basis grout of shutoff formula under water connection structure |
-
2018
- 2018-05-07 CN CN201810426869.0A patent/CN108661031B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1363743A (en) * | 2002-01-25 | 2002-08-14 | 胜利油田胜利石油化工建设有限责任公司 | Method and apparatus for grouting with guide pipe on offshore platform |
| WO2011160703A2 (en) * | 2010-06-23 | 2011-12-29 | Siemens Aktiengesellschaft | Jacket structure for offshore constructions |
| CN205046588U (en) * | 2015-09-08 | 2016-02-24 | 广东明阳风电产业集团有限公司 | Marine fan jacket basis grout of shutoff formula under water connection structure |
Non-Patent Citations (2)
| Title |
|---|
| "灌浆修复对导管架受损杆件的作用探讨";王江宏，徐峰，董春华;《科技经济导刊》;20170705;第162-163页 * |
| "船舶撞击后导管架安全性评估修复的方法探讨";张孝卫，刘玉玺，徐峰，荆潇，孟庆政;《船海工程》;20140825;第117-120页 * |
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| CN108661031A (en) | 2018-10-16 |
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Address after: 518067 4th floor, phase I, Shekou science and technology building, Nanhai Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee after: CNOOC Shenzhen Ocean Engineering Technology Service Co.,Ltd. Address before: 518067 4th floor, phase I, Shekou science and technology building, Nanhai Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee before: COOEC SUBSEA TECHNOLOGY Co.,Ltd. |