Construction method for manufacturing, mounting and constructing skirt piles of jacket at water depth of 300 meters

Abstract

The invention relates to the technical field of deepwater ocean equipment, in particular to a 300-meter water depth jacket skirt pile manufacturing and installing construction method which comprises the steps that a cushion pier and a supporting frame are prepared, and welding pretreatment is conducted on a sleeve; a semi-arc plate and a horn mouth are mounted on the sleeve; a sleeve is hoisted on a cushion pier, and after the space posture of the sleeve is adjusted, the two ends of the sleeve are welded and fixed through Yoke plates; a second sleeve is hoisted on the cushion pier, the space posture of the second sleeve is adjusted so that the second sleeve can be matched with the first sleeve, a Yoke plate and the second sleeve are welded and fixed, and shear plates are welded to the first two sleeves; the rest of the guide pipe leg, the third sleeve and the fourth sleeve are sequentially hoisted according to the installation mode of the second sleeve, the space postures are adjusted, and the guide pipe leg, the third sleeve and the fourth sleeve are mutually welded and fixed through Yoke plates and shear plates; and post-processing. According to the pre-installation method for the skirt piles of the deepwater jacket, the prefabrication efficiency and quality can be effectively improved, and meanwhile the overall quality can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of deepwater marine equipment, and in particular to a method for manufacturing and installing a jacket pile at a water depth of 300 meters. Background Art

[0002] The jacket platform, also known as the pile platform, is supported by piles driven into the seabed. The jacket platform has high overall rigidity and is less affected by environmental loads such as waves and currents. Therefore, it is widely used in offshore wind power, oil and gas drilling, offshore aquaculture and other fields.

[0003] With the development and growth of my country's marine sector, the demand for jacket platforms is increasing. At present, jacket platforms are generally prefabricated on land, then transported to the preset sea area by barges, and then hoisted in the preset sea area by hoisting equipment. At present, there is no relatively mature assembly process for the land prefabrication of jacket foundation platforms. Its assembly efficiency and product quality are completely determined by the workers' experience, resulting in different quality and efficiency of construction by different construction units, especially the welding of jacket skirt piles. As the installation foundation of the entire jacket, the jacket skirt piles have the characteristics of multiple and complex connection structures and a large number of welds. In addition, the jacket skirt piles are also used as the installation foundation of other installation structures. Therefore, the welding accuracy of the jacket skirt piles is high. An unreasonable welding assembly sequence will cause stress concentration in the jacket skirt piles, which will directly affect the overall strength and weld quality of the jacket skirt piles. Summary of the invention

[0004] In order to overcome one of the deficiencies of the prior art, the object of the present invention is to provide a method for manufacturing and installing a skirt pile of a jacket at a water depth of 300 meters. The technical solution adopted by the present invention is as follows:

[0005] The construction method for manufacturing and installing the skirt piles of the 300-meter water depth jacket includes the following steps:

[0006] Step S100, prepare a pier and a support frame, mark a preset position on the sleeve in advance and perform welding pretreatment;

[0007] Step S200, machining an outer mud hole on the sleeve, and installing a semicircular plate in a region corresponding to the outer mud hole; welding a bell mouth on the end of the semicircular plate to complete the pre-machining of the sleeve;

[0008] Step S300, hoisting one of the sleeves on the pier, adjusting the spatial posture of the sleeve, and then welding and fixing the two ends of the sleeve by Yoke plates; hoisting the second sleeve on the pier, adjusting the spatial posture of the second sleeve to adapt to the first sleeve, welding and fixing the Yoke plate to the second sleeve, and welding the shear plates on the first two sleeves; hoisting and adjusting the spatial posture of the remaining conduit legs, the third sleeve, and the fourth sleeve in turn according to the installation method of the second sleeve, and all of them are welded and fixed to each other by Yoke plates and shear plates; after the welding of the fourth sleeve is completed, the conduit frame skirt pile is obtained;

[0009] Step S400: measuring the overall dimensions of the jacket skirt piles, and then performing subsequent processing.

[0010] In some possible embodiments, the specific steps of step S300 include:

[0011] Step S310, hoisting one of the sleeves on the pier, adjusting the spatial posture of the sleeve and using a support frame to relatively fix the position between the pier and the sleeve, and welding the lower Yoke plate on the lower sides of both ends of the sleeve;

[0012] Step S320, hoist the second sleeve on the pier, adjust the spatial posture of the second sleeve to adapt to the first sleeve; after the spatial posture of the second sleeve is completed, weld and fix the second sleeve to the corresponding end of the lower Yoke plate, and then weld the middle Yoke plate to the two ends of the two sleeves, and the position of the lower Yoke plate and the middle Yoke plate are adapted and welded and fixed; then weld the shear plate between the two middle Yoke plates, the shear plate is set along the axis direction of the two sleeves and the corresponding side edge is welded and fixed to the corresponding outer wall of the sleeve;

[0013] Step S330, hoist the conduit leg on the two middle Yoke plates, adjust the spatial posture of the conduit leg relative to the two sleeves, weld and fix the conduit leg to the two middle Yoke plates and the conduit leg to the other side of the shear plate; weld a third shear plate on one side of the conduit leg, and both ends of the third shear plate are also welded and fixed to the two middle Yoke plates;

[0014] Step S340, hoisting the third sleeve on the two middle Yoke plates and on the side corresponding to the third shear plate, adjusting the spatial posture of the third sleeve relative to the conduit leg, welding and fixing the third sleeve to the two middle Yoke plates, and welding and fixing the third sleeve to the third shear plate;

[0015] Step S350, welding an upper Yoke plate to both ends of the conduit leg and the third sleeve, welding a fourth shear plate to the conduit leg, and welding and fixing both ends of the fourth shear plate to the two upper Yoke plates;

[0016] Step S360, hoist the fourth sleeve onto the two upper Yoke plates, adjust the spatial posture of the fourth sleeve relative to the conduit legs, and weld and fix the two upper Yoke plates and the fourth shear plate to the fourth sleeve respectively.

[0017] In some possible embodiments, in step S320, during the spatial posture adjustment process of the second sleeve, a jack is used to adjust the horizontal difference between the two ends of the second sleeve, and a fall chain is used to adjust the rotation angle of the second sleeve, so that the orientation angle of the semi-circular plate on the second sleeve is relative to the orientation angle of the semi-circular plate on the first sleeve, and the position between the pier and the second sleeve is relatively fixed by a support frame, and the middle part of the first sleeve and the second sleeve is relatively fixed by a horse row structure.

[0018] In some possible embodiments, in step S320, when the shear plate is welded between the two middle Yoke plates, symmetrical welding is required to eliminate welding deformation.

[0019] In some possible embodiments, in step S330 to step S360, the spatial postures of all the sleeves and catheter legs are adjusted to a horizontal level using a jack, and are fixed to each other using a horse-and-steel structure before being welded and fixed.

[0020] In some possible embodiments, step S360 also includes step S370: welding side Yoke plates on both ends of the fourth sleeve and the second sleeve, and welding and fixing one side edge of the side Yoke plate to the catheter leg, the upper Yoke plate and the middle Yoke plate respectively to complete the welding of the catheter frame skirt pile.

[0021] In some possible embodiments, step S370 also includes step S380: after welding the Yoke plates on the sides, outer arc-shaped Yoke plates need to be welded on all sleeves, and the outer arc-shaped Yoke plates are welded on the outward side of each sleeve and the two ends are respectively connected to the ends of adjacent Yoke plates.

[0022] In some possible embodiments, the subsequent processing in step S400 specifically includes: performing nondestructive testing on the welds on the jacket skirt piles, and coating the welds with anti-corrosion materials.

[0023] In some possible embodiments, a is set to represent the lower Yoke plate, b represents the middle Yoke plate, c represents the upper Yoke plate, d represents the side Yoke plate, e represents the outer arc-shaped Yoke plate, f represents the first sleeve, g represents the second sleeve, h represents the duct leg, i represents the third sleeve, j represents the fourth sleeve, and k represents the shear plate; the installation sequence is: f→a→g→b→k (below)→h→k (upper left)→i→c→j→k (upper right)→d→e.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The manufacturing and installation construction method of the 300-meter-deep jacket skirt pile of the present invention can effectively reduce the trouble of later assembly by pre-processing the sleeve. Compared with the traditional assembly method of assembling the jacket skirt pile and then assembling the bell mouth and the semi-circular arc plate, the present construction scheme improves the processing efficiency, and the assembly environment can be optimized, avoiding processing in a narrow area, and ensuring the quality of the welds between the semi-circular arc plate, the bell mouth and the sleeve. In addition, by adjusting the welding sequence between the sleeve, the jacket leg, the Yoke plate and the shear plate, the welding efficiency can be effectively improved, and the stress concentration can be effectively reduced to ensure the overall welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a flow chart of an embodiment of the present invention;

[0028] Figure 2 is a flow chart of the welding sequence of different components in an embodiment of the present invention;

[0029] Figure 3 is a cross-sectional view of a jacket skirt pile in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1 and Figure 2 The manufacturing and installation construction method of the 300-meter water depth jacket skirt pile shown in the figure includes the following steps:

[0032] Step S100, prepare a pier and a support frame, mark a preset position on the sleeve in advance and perform welding pretreatment;

[0033] Step S200, processing an outer mud hole on the sleeve, and installing a semicircular arc plate in the area corresponding to the outer mud hole; welding a bell mouth on the end of the semicircular arc plate to complete the pre-processing of the sleeve;

[0034] Step S300, hoisting a sleeve on the pier, adjusting the spatial posture of the sleeve, and then welding and fixing the two ends of the sleeve by Yoke plates; hoisting the second sleeve on the pier, adjusting the spatial posture of the second sleeve to adapt to the first sleeve, welding and fixing the Yoke plate to the second sleeve, and welding the shear plates on the first two sleeves; hoisting and adjusting the spatial posture of the remaining conduit legs, the third sleeve, and the fourth sleeve in turn according to the installation method of the second sleeve, and welding and fixing them to each other by Yoke plates and shear plates; after the welding of the fourth sleeve is completed, the conduit frame skirt pile is obtained;

[0035] Step S400: measuring the overall dimensions of the jacket skirt piles, and then performing subsequent processing.

[0036] This deepwater jacket skirt pile pre-installation method can effectively reduce the trouble of later assembly by pre-processing the sleeve. Compared with the traditional assembly method of assembling the jacket skirt pile and then assembling the bell mouth and semi-circular arc plate, this construction scheme improves the processing efficiency. At the same time, the assembly environment can be optimized to avoid processing in narrow areas, and the weld quality between the semi-circular arc plate, bell mouth and sleeve can be guaranteed. In addition, by adjusting the welding sequence between the sleeve, the jacket leg, the Yoke plate and the shear plate, the welding efficiency can be effectively improved, and the stress concentration can be effectively reduced to ensure the overall welding quality.

[0037] In order to explain the welding process of step S300 in more detail and how to reduce the stress concentration during the welding process, in one embodiment of the present application, the specific steps of step S300 include:

[0038] Step S310, hoist a sleeve on the pier, adjust the spatial posture of the sleeve and use a support frame to relatively fix the position between the pier and the sleeve, and weld the lower Yoke plate on the lower sides of both ends of the sleeve;

[0039] Step S320, hoist the second sleeve on the pier, adjust the spatial posture of the second sleeve to adapt to the first sleeve; after the spatial posture of the second sleeve is completed, weld and fix the second sleeve to the corresponding end of the lower Yoke plate, and then weld the middle Yoke plate to the two ends of the two sleeves, and the position of the lower Yoke plate and the middle Yoke plate are adapted and welded and fixed; then weld the shear plate between the two middle Yoke plates, the shear plate is set along the axis direction of the two sleeves and the corresponding side side is welded and fixed to the corresponding outer wall of the sleeve;

[0040] Step S330, hoist the conduit leg on the two middle Yoke plates, adjust the spatial posture of the conduit leg relative to the two sleeves, weld and fix the conduit leg to the two middle Yoke plates and the conduit leg to the other side of the shear plate; weld a third shear plate on one side of the conduit leg, and both ends of the third shear plate are also welded and fixed to the two middle Yoke plates;

[0041] Step S340, hoisting the third sleeve on the two middle Yoke plates and on the side corresponding to the third shear plate, adjusting the spatial posture of the third sleeve relative to the conduit leg, welding and fixing the third sleeve to the two middle Yoke plates, and welding and fixing the third sleeve to the third shear plate;

[0042] Step S350, welding the upper Yoke plates to the two ends of the conduit leg and the third sleeve, welding the fourth shear plate to the conduit leg, and welding and fixing the two ends of the fourth shear plate to the two upper Yoke plates;

[0043] Step S360, hoist the fourth sleeve onto the two upper Yoke plates, adjust the spatial posture of the fourth sleeve relative to the conduit legs, and weld and fix the two upper Yoke plates and the fourth shear plate to the fourth sleeve respectively.

[0044] The first sleeve and the pier can be fixed by welding to prevent them from loosening, and then cut and separate them after the overall completion. In this application, in order to facilitate support, the bottom of the pier is a concrete block, on which a metal column is arranged, which is convenient for welding and fixing with the sleeve. In addition, the heights of the columns at different positions are different, so as to adapt to different sleeves. In addition, in some embodiments, for construction safety, adjacent piers can be connected by a supporting structure to improve the overall support strength and stability.

[0045] In addition, in the above-mentioned embodiment, the orientation of the semi-circular arc plates on all sleeves is specifically specified, and the side of the opening cannot be facing the duct leg. The purpose of this is to facilitate the workers to observe and operate when the duct frame skirt pile module is assembled with other modules in the later stage, and to enable rapid alignment and assembly, which is conducive to later welding and fixing. It should be supplemented that in the above-mentioned embodiment, the welds between all adjacent Yoke plates can be welded at the end, which can reduce the stress concentration of the entire Yoke plate. In addition, the Yoke plate at the bottom, the Yoke plate at the top, and the Yoke plate at the middle in the present application are actually Yoke plates, but their installation positions are different, so different names are used to facilitate distinction. In addition, the present application uses four sleeves to surround the duct leg, which can effectively protect the duct leg.

[0046] In some possible embodiments, in step S320, during the spatial posture adjustment process of the second sleeve, a jack is used to adjust the horizontal difference between the two ends of the second sleeve, and a fall chain is used to adjust the rotation angle of the second sleeve, so that the semi-circular plate on the second sleeve is oriented in the same direction as the semi-circular plate on the first sleeve. The support frame is used to relatively fix the position between the pier and the second sleeve, and the middle of the first sleeve and the second sleeve is relatively fixed by the horse row structure. It should be noted that during the welding process, the lifting equipment lifts the sleeve throughout the whole process; in order to facilitate the rotation of the sleeve during the lifting process, a rotating tire is also installed on the outer sleeve of the sleeve in the present application, and the lifting equipment directly lifts the rotating tire, which is conducive to the workers to rotate and adjust the rotation angle of the sleeve. The rotating tire is a lifting tool with multiple overlapping rings, and its main purpose is to facilitate the rotation of the hoisted workpiece.

[0047] In some possible embodiments, in order to reduce stress concentration caused during welding, in step S320, when welding the shear plate between the two middle Yoke plates, symmetrical welding is required to eliminate welding deformation.

[0048] In addition, in order to fix adjacent sleeves or catheter legs during the welding process, in some possible embodiments, in steps S330 to S360, the spatial postures of all sleeves and catheter legs are adjusted to a horizontal difference using a jack, and are fixed to each other using a horse-and-steel structure before they can be welded and fixed.

[0049] In some possible embodiments, in order to ensure overall stability and to completely cover the conduit legs in the middle area of ​​the four sleeves, step S360 also includes step S370: welding side Yoke plates on both ends of the fourth sleeve and the second sleeve, and the side edges corresponding to the side Yoke plates are respectively welded and fixed to the conduit legs, the upper Yoke plate and the middle Yoke plate to complete the welding of the conduit frame skirt piles.

[0050] In order to better protect and connect the outward side of all sleeves with Yoke plates, an improved embodiment of the present application also includes step S380 after step S370: after welding the Yoke plates on the sides, it is necessary to weld outer arc-shaped Yoke plates on all sleeves, and the outer arc-shaped Yoke plates are welded on the outward side of each sleeve and the two ends are respectively connected to the ends of adjacent Yoke plates.

[0051] In some possible embodiments, the subsequent processing in step S400 specifically includes: performing nondestructive testing on the welds on the jacket skirt piles, and coating the welds with anti-corrosion materials.

[0052] See also Figure 2 and Figure 3 , Figure 2 This is a specific welding sequence flow chart of this application. For ease of understanding, you can refer to this figure; in addition, for ease of understanding the structure of the entire jacket skirt pile, refer to Figure 3 , Figure 3 is a cross-sectional view of the jacket skirt pile in this application, wherein Figure 3 In the figure, a represents the lower Yoke plate, b represents the middle Yoke plate, c represents the upper Yoke plate, d represents the side Yoke plate, e represents the outer arc Yoke plate, f represents the first sleeve, g represents the second sleeve, h represents the duct leg, i represents the third sleeve, j represents the fourth sleeve, and k represents the shear plate; the installation sequence is: f→a→g→b→k (below)→h→k (upper left)→i→c→j→k (upper right)→d→e.

[0053] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. 300m water depth jacket skirt pile manufacturing and installation construction method, characterized by: The following steps are involved: Step S100, prepare a pier and a support frame, mark a preset position on the sleeve in advance and perform welding pretreatment; Step S200, machining an outer mud hole on the sleeve, and installing a semicircular plate in a region corresponding to the outer mud hole; welding a bell mouth on the end of the semicircular plate to complete the pre-machining of the sleeve; Step S300, hoisting one of the sleeves on the pier, adjusting the spatial posture of the sleeve, and then welding and fixing the two ends of the sleeve by Yoke plates; hoisting the second sleeve on the pier, adjusting the spatial posture of the second sleeve to adapt to the first sleeve, welding and fixing the Yoke plate to the second sleeve, and welding the shear plates on the first two sleeves; hoisting and adjusting the spatial posture of the remaining conduit legs, the third sleeve, and the fourth sleeve in turn according to the installation method of the second sleeve, and all of them are welded and fixed to each other by Yoke plates and shear plates; after the welding of the fourth sleeve is completed, the conduit frame skirt pile is obtained; Step S400: measuring the overall dimensions of the jacket skirt piles, and then performing subsequent processing.

2. The method for manufacturing and installing the skirt piles of a 300-meter water depth jacket according to claim 1 is characterized in that: The specific steps of step S300 include: Step S310, hoisting one of the sleeves on the pier, adjusting the spatial posture of the sleeve and using a support frame to relatively fix the position between the pier and the sleeve, and welding the lower Yoke plate on the lower sides of both ends of the sleeve; Step S320, hoist the second sleeve on the pier, adjust the spatial posture of the second sleeve to adapt to the first sleeve; after the spatial posture of the second sleeve is completed, weld and fix the second sleeve to the corresponding end of the lower Yoke plate, and then weld the middle Yoke plate to the two ends of the two sleeves, and the position of the lower Yoke plate and the middle Yoke plate are adapted and welded and fixed; then weld the shear plate between the two middle Yoke plates, the shear plate is set along the axis direction of the two sleeves and the corresponding side edge is welded and fixed to the corresponding outer wall of the sleeve; Step S330, hoist the conduit leg on the two middle Yoke plates, adjust the spatial posture of the conduit leg relative to the two sleeves, weld and fix the conduit leg to the two middle Yoke plates and the conduit leg to the other side of the shear plate; weld a third shear plate on one side of the conduit leg, and both ends of the third shear plate are also welded and fixed to the two middle Yoke plates; Step S340, hoisting the third sleeve on the two middle Yoke plates and on the side corresponding to the third shear plate, adjusting the spatial posture of the third sleeve relative to the conduit leg, welding and fixing the third sleeve to the two middle Yoke plates, and welding and fixing the third sleeve to the third shear plate; Step S350, welding an upper Yoke plate to both ends of the conduit leg and the third sleeve, welding a fourth shear plate to the conduit leg, and welding and fixing both ends of the fourth shear plate to the two upper Yoke plates; Step S360, hoist the fourth sleeve onto the two upper Yoke plates, adjust the spatial posture of the fourth sleeve relative to the conduit legs, and weld and fix the two upper Yoke plates and the fourth shear plate to the fourth sleeve respectively.

3. The method for manufacturing and installing the skirt piles of a 300-meter water depth jacket according to claim 2 is characterized in that: In step S320, during the spatial posture adjustment process of the second sleeve, a jack is used to adjust the horizontal difference between the two ends of the second sleeve, and a fall chain is used to adjust the rotation angle of the second sleeve, so that the orientation angle of the semi-circular plate on the second sleeve is relative to the orientation angle of the semi-circular plate on the first sleeve, and a support frame is used to relatively fix the position between the pier and the second sleeve, and a horse row structure is used to relatively fix the middle parts of the first sleeve and the second sleeve.

4. The method for manufacturing and installing the skirt piles of a 300-meter-deep jacket according to claim 3 is characterized in that: In step S320, when the shear plate is welded between the two middle Yoke plates, symmetric welding is required to eliminate welding deformation.

5. The method for manufacturing and installing the skirt piles of a 300-meter-deep jacket according to claim 3 is characterized in that: In step S330 to step S360, the spatial postures of all the sleeves and catheter legs are adjusted to a horizontal level using a jack, and are fixed to each other using a horse-and-steel structure before being welded and fixed.

6. The method for manufacturing and installing the skirt piles of a 300-meter water depth jacket according to claim 3 is characterized in that: Step S360 also includes step S370: welding side Yoke plates on both ends of the fourth sleeve and the second sleeve, and welding and fixing one side edge of the side Yoke plate to the conduit leg, the upper Yoke plate and the middle Yoke plate respectively to complete the welding of the conduit frame skirt pile.

7. The method for manufacturing and installing the skirt piles of a 300-meter-deep jacket according to claim 6 is characterized in that: Step S370 also includes step S380: after welding the Yoke plates on the side, outer arc-shaped Yoke plates need to be welded on all sleeves. The outer arc-shaped Yoke plates are welded on the outward side of each sleeve and the two ends are respectively connected to the ends of adjacent Yoke plates.

8. The method for manufacturing and installing the skirt piles of a 300-meter water depth jacket according to claim 1 is characterized in that: The subsequent processing in step S400 specifically includes: performing nondestructive testing on the welds on the jacket skirt piles, and coating the welds with anti-corrosion materials.

9. The method for manufacturing and installing the skirt piles of a jacket at a water depth of 300 meters according to claim 2 is characterized in that: It is set that a represents the lower Yoke plate, b represents the middle Yoke plate, c represents the upper Yoke plate, d represents the side Yoke plate, e represents the outer arc Yoke plate, f represents the first sleeve, g represents the second sleeve, h represents the duct leg, i represents the third sleeve, j represents the fourth sleeve, and k represents the shear plate; the installation order is: f→a→g→b→k (below)→h→k (upper left)→i→c→j→k (upper right)→d→e.

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