JP2017052469A - Floating installation provided with riser support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently build a floating installation provided with a riser support structure, even if types and disposition of riser tubes are not determined.SOLUTION: With respect to a floating installation 10 such as an FPSO installation attached with a riser support structure 14 (14A, 14B) for supporting a riser tube R on the outside of an external plate 12, an upper riser support structure 14A is attached to the external plate 12 via an attachment platform structure 22A attached to the outside of the external plate 12. A lower riser support structure 14B is attached to the external plate 12 via an attachment platform structure 22B attached to the outside of the external plate 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an attachment structure for a riser support structure attached to an outer plate of a floating facility.

  In floating production storage and loading equipment (FPSO equipment) and tension mooring platform (TLP), there are many riser pipes that connect between the sea floor and offshore facilities, and fluids such as crude oil, gas, and seawater are transported through the riser pipes. . The riser tube has flexibility and is pulled in through a guide provided on an outer plate near the keel and fixed in the horizontal direction (see Patent Document 1).

JP-T-2006-519137

  In the configuration of Patent Document 1, the riser is supported in the lateral direction by a keel guide provided in the sea, and is supported in the vertical direction by a tension applying device provided in a deck at sea. However, a configuration is also known in which the riser is supported in the horizontal direction and the vertical direction by a riser support structure provided on the outer plate of the floating equipment above or below the draft. In such a configuration, high strength is required to support the riser connecting the oil well on the seabed and the floating facility. Therefore, it is desirable that the riser support structure is constructed as a steel structure integrated with the outer plate of the floating equipment. The configuration of the riser support structure varies depending on the type and arrangement of the riser, but generally it takes time until the arrangement of the riser is finally determined. Therefore, the type and arrangement of the risers may be changed after the construction of the floating facilities starts. In that case, it is necessary to perform remodeling work.

  This invention makes it a subject to construct the floating body equipment provided with a riser support structure efficiently, even if the kind and arrangement | positioning of a riser pipe | tube are not determined.

  The floating equipment according to the present invention includes an outer plate and a riser support structure attached to the outer side of the outer plate, and a mounting base structure for attaching the riser support structure to the outer plate is provided. Yes.

  It is preferable that the floating equipment includes a web frame provided in a vertical direction along the inner side of the outer plate, and the web frame is structurally reinforced at a position where the riser support structure is attached. The riser support structure includes, for example, a riser tube support portion that inserts, holds, and fixes the riser, and the mounting base structure is configured as a structure that supports the riser tube support portion. Also, the riser support structure is divided into, for example, a riser tube support portion for inserting and holding and fixing the riser, and a structure that is attached to the outer plate via the mounting base structure and supports the riser tube support portion. Is done. The structure that supports the riser tube support is configured as a bracket member, for example.

  For example, after the structure that supports the riser pipe support is attached to the outer plate of the floating facility, the riser pipe support is attached to the structure that supports the riser pipe support. The riser tube support portion may include a unit structure in units of two risers. Further, the riser tube support portion may include a unit structure with one riser as a unit. For example, the riser tube support section includes a top plate, and two unit structures can be attached to the top plate, and openings having a circular arc shape are provided at both ends in the longitudinal direction. One unit structure is attached. At this time, the unit structure is provided with a half-round flange portion adapted to the arc shape. For example, the riser pipe support is disposed above the draft. Further, the riser pipe support portion may be disposed below the draft.

  A method for manufacturing a floating body equipment according to the present invention is a method for manufacturing a floating body equipment comprising an outer plate and a riser support structure attached to the outside of the outer plate, and a mounting base for attaching the riser support structure to the outer plate. The structure is provided, and the riser support structure is inserted into the riser tube support part for inserting and holding and fixing the riser, and the structure that is attached to the outer plate via the mount structure and supports the riser pipe support part. The structure is divided, and the structure supporting the riser pipe support is attached to the outer plate, and then the riser pipe support is attached to the structure supporting the riser pipe support.

  According to the present invention, a floating facility equipped with a riser support structure can be efficiently constructed even if the type and arrangement of the riser pipe are not determined.

It is a partial cross-sectional view of the floating facility of the first embodiment according to the present invention. It is a figure which shows the attachment aspect to the floating body installation of the riser support structure in 1st Embodiment. It is an enlarged view in case there is no opening part, such as a manhole of the part enclosed with the frame A in FIG. It is an enlarged view in case there exists opening parts, such as a manhole of the part enclosed with the frame A in FIG. It is a figure which shows the aspect which attaches to the floating body installation of the riser support structure in a 1st modification. It is a figure which shows the aspect which attaches the riser support structure in the 2nd modification to the floating body installation. It is a perspective view which shows the structure of the riser pipe | tube support part unit of 2nd Embodiment. It is a top view for showing the attachment mode of the riser pipe support part unit of Drawing 7. It is a perspective view which shows the structure of the riser pipe | tube support part unit of 3rd Embodiment. It is a top view for showing the attachment mode of the riser pipe support part unit of Drawing 9. It is a partial cross-sectional view of the floating facility of the fourth embodiment.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a floating facility according to a first embodiment of the present invention.

  The floating facility 10 of the present embodiment is a FPSO facility having a ship shape including a processing facility for processing hydrocarbons such as crude oil and gas. The floating facility 10 is constructed, for example, by dividing it into blocks in the longitudinal direction, and is constructed using a block construction method in which the blocks are joined together in the final process. After construction, the floating body facility 10 is self-propelled or towed and transferred to an installation sea area (water area). After mooring in the sea area (water area), a large number of flexible riser pipes R are attached.

  The riser pipe R is guided to the sea floor along the outer plate 12 of the floating body facility 10, and on the outside of the outer plate 12, a riser support structure for fixing the horizontal and vertical positions of each riser pipe R. 14 is attached. The riser support structure 14 is disposed above the outer plate 12 along the longitudinal direction of the floating facility 10. FIG. 1 is a diagram showing a cross-sectional view of the riser support structure 14 and the outer plate 12 of the floating facility 10 at the same position.

The riser support structure 14 includes an upper riser support structure 14A that holds and fixes the riser pipe R above the ship-side skin 12 and a riser pipe that hangs down into the sea below the ship-side skin 12 such as near a draft bilge. And a lower riser support structure 14B for holding R. 14 A of upper riser support structures are equipped with the riser pipe | tube R by which the riser pipe | tube R was penetrated, and holding / fixing this, the attached structure parts 18 and 19, and the bracket member 20. As shown in FIG. The bracket member 20 is, for example, an inverted right triangular plate-like structure, and is attached to the outside of the outer plate 12 along the longitudinal direction of the floating facility 10 at a predetermined interval. The riser pipe support 16 is stretched over the bracket member 20 at the top of the bracket member 20. Further, the lower riser support structure 14B is mainly composed of a guide tube that regulates the horizontal movement of the riser pipe R, for example.

  In the first embodiment, the riser tube support portion 16, the attached structure portions 18 and 19, and the bracket member 20 of the upper riser support structure 14A are pre-assembled in units of a predetermined length, and after the block assembly of the floating equipment 10, 2 is assembled. The upper riser support structure 14A integrated as shown in FIG. 2 is attached to the outside of the outer plate 12 of the floating facility 10 using welding or the like. Also, the lower riser support structure 14B, which is assembled in advance as shown in FIG. 2, is attached to the outside of the outer plate 12 of the floating equipment 10 using welding or the like after the block assembly of the floating equipment 10 is assembled.

  In the present embodiment, each of the upper riser support structure 14A and the lower riser support structure 14B is attached to the floating facility 10 via the mounting base structures 22A and 22B. That is, the mounting base structures 22A and 22B are vertically long members (for example, T-shaped structures) having lengths corresponding to the vertical lengths of the upper riser support structure 14A and the lower riser support structure 14B, respectively. At the time of building each block, it is provided along the vertical direction outside the outer plate 12 corresponding to the mounting position of the bracket member 20 and the mounting position of the lower riser support structure 14B. The riser support structure 14 is fixed to the floating equipment 10 by welding the bracket member 20 of the upper riser support structure 14A to the mounting base structure 22A and welding the lower riser support structure 14B to the mounting base structure 22B. The

  Next, with reference to FIG. 3 and FIG. 4, the reinforcement structure of the web frame in this embodiment is demonstrated. 3 and 4 are enlarged views of a portion surrounded by a frame A in FIG. FIG. 3 shows an embodiment where the web frame has no openings such as manholes, and FIG. 4 shows an embodiment where the web frame has openings such as manholes.

  As shown in FIG. 3 and FIG. 4, a number of longitudinal stiffeners 24 are provided on the inner side of the outer plate 12 of the floating facility 10, and the position where the riser support structure 14 is provided has a cross-sectional view. A web frame 26 is provided extending along. In the present embodiment, the web frame 26 at a position corresponding to the uppermost portion of the portion (the mounting base structure 22A and / or the mounting base structure 22B) to which the riser support structure 14 is attached is placed in a predetermined range (for example, vertical and horizontal lengthwise). It is replaced in advance by a reinforcing material (for example, +5 mm to +15 mm thick) having a thickness greater than that of the other over the span of 0.5 to 1.5 times the mounting interval of the stiffener 24. For example, in FIGS. 3 and 4, the uppermost end portion of the mounting base structure 22A coincides with the positions of the longitudinal stiffeners 24A and 24B, and the web frame 26 around the longitudinal stiffeners 24A and 24B is the reinforcing material. 28A and 28B are replaced and attached to the surrounding web frame 26 by welding. In addition, because of the necessity of assembling the plate material of the web frame 26 to the normal longitudinal stiffener 24, between one side of the longitudinal stiffener 24 (the lower side in FIGS. 3 and 4) and the web frame 26, There may be a gap 12A. In the present embodiment, reinforcing members 30A and 30B (plate materials having substantially the same material and thickness as the reinforcing members 28A and 28B) are fitted into the gap 12A, and are usually welded to the longitudinal stiffener 24 and the web frame 26. . As shown in FIG. 4, when the width of the longitudinal stiffener web or the gap 12 </ b> A is substantially equal to or larger than the predetermined range of the reinforcing material, the reinforcing material may be divided vertically. In some cases, a ship-side longitudinal girder may be provided instead of the longitudinal stiffener. The structural reinforcement by the reinforcing members 28A, 28B, 30A, and 30B is designed corresponding to the heaviest anticipated upper riser support structure 14A (or lower riser structure 14B). In FIG. 4, the opening 32 is a manhole, and the longitudinal stiffener 24B also serves as a floor surface.

  As described above, according to the first embodiment, by providing the mounting structure extending outward from the outer plate, for example, after coating the inner side of the outer plate, welding for attaching the riser support structure is performed. For example, the riser support structure can be manufactured after completion of the floating equipment. In addition, in this embodiment, even if the type and arrangement of the riser are not determined in advance, the type of riser after block assembly is adopted by adopting a reinforcement structure that assumes the maximum load at the riser support structure mounting position of the floating body equipment. Even if the arrangement is determined, it is not necessary to make another modification around the riser support structure mounting position, so that the construction period can be shortened and labor and manufacturing costs can be reduced.

  Next, first and second modifications of the first embodiment will be described with reference to FIGS. The first and second modified examples are in the difference in unitization of the riser support structure. Other configurations are the same as those of the first embodiment, and the same reference numerals are used for the same configurations and the description thereof is omitted.

  In the first embodiment, as shown in FIG. 2, the upper riser support structure is attached to the outside of the outer plate 12 of the floating facility 10 after assembling all the components. However, the structure changed depending on the type and arrangement of the riser is a part of the riser support structure. Accordingly, in the first and second modified examples, by standardizing other than the configuration that is changed depending on the type and arrangement of the risers, for example, the floating body equipment 10 in the block state is attached in advance, and members other than the same configuration are assembled after the block is assembled. It can be attached. In the first modification of FIG. 5, for example, the bracket member 20 is standardized and attached in advance to the outside of the outer plate 12 at each block construction stage, and the riser pipe support portion 16 and the attached structure portions 18 and 19 are assembled after the block assembly (the riser After the type and arrangement are determined, the bracket member 20A is attached. On the other hand, in the second modified example of FIG. 6, for example, the bracket member 20A and the accessory structure 19 are standardized, and only these are attached to the outside of the outer plate 12 in advance at each block construction stage. 18 is attached to the bracket member 20A after assembling the blocks (after determining the type and arrangement of the risers).

  As described above, the same effects as those of the first embodiment can be obtained in the first and second modified examples. Moreover, in a modification, since these components can be attached beforehand by standardizing the components which are not related to the type and arrangement of the risers, it is possible to construct a floating facility more efficiently.

  Next, with reference to FIG. 7, FIG. 8, the structure of the riser support structure applied to the floating body installation of 2nd Embodiment is demonstrated. The difference from the first embodiment to the second embodiment is only the difference in the configuration of the riser pipe support, and the other configurations are the same as those in the first embodiment and the first and second modifications. Therefore, the same reference numerals are used for the same components, and the description thereof is omitted.

  The second embodiment is an embodiment applied when it is clear that only two types of riser pipes having different diameters are used. In such a case, if the riser pipe support is unitized in units of two risers, there are only four types of large diameter and small diameter permutations. Therefore, in 2nd Embodiment, a riser pipe | tube support part is comprised as the riser pipe | tube support part unit 160 for 2 risers as a unit.

  FIG. 7 is a perspective view showing the configuration of one type of riser pipe support unit 160A. As shown in FIG. 7, the riser pipe support unit 160 </ b> A includes two cylindrical members 161 and 162 having different diameters that form riser pipe insertion holes through which the riser pipes are inserted, and upper and lower portions of the cylindrical members 161 and 162. A pair of top plates 163 and 164 that support the ends, and plate members 165 that support the side surfaces of the cylindrical members 161 and 162 from four directions and maintain the strength of the entire unit.

  In the example of FIG. 7, the cylindrical members 161 and 162 having different diameters are paired. However, as other units, the cylindrical members 161 of the riser tube support unit 160B and 160A having two large-diameter cylinders 161 as a pair. , 162 in which the arrangement of 162 is reversed, a riser tube support unit 160D in which two small-diameter cylinders 162 are paired is formed (see FIG. 8).

  FIG. 8 is a plan view of the riser tube support unit 160 and the attachment structure assemblies 180 and 190, which are assemblies of the attachment structures 18 and 19, and FIG. 8A shows a state after assembly. FIG. 8B shows a state before assembly.

  As described above, also in the second embodiment, the same effect as that of the first embodiment can be obtained. In the second embodiment, since the types of riser tubes are specified, by preparing several types of riser tube support units corresponding to the combinations in advance, these are determined after determining the arrangement of the riser tubes. Assembling efficiency can be further improved by combining (welding) with the arrangement of the riser tube.

  Next, with reference to FIG. 9, FIG. 10, the structure of the riser support structure applied to the floating body installation of 3rd Embodiment is demonstrated. The difference from the first and second embodiments to the third embodiment is only the difference in the configuration of the riser pipe support, and the other configurations are the same as those in the first and second embodiments and the first and second modifications. It is. Therefore, the same reference numerals are used for the same components, and the description thereof is omitted.

  In 3rd Embodiment, a riser pipe | tube support part is comprised as a unit which makes one riser unit. 9 and 10 show riser pipe support units 170 and 171 when two types of riser pipes having a large diameter and a small diameter are used, for example. The riser tube support unit 170 is mainly composed of a large-diameter cylindrical member 172, and the riser tube support unit 171 is mainly composed of a small-diameter cylindrical member 173. Flange portions 174 and 175 extending outward are provided at the upper and lower opening ends of the riser tube support unit units 170 and 171, respectively. The flange portions 174 and 175 have a circular arc shape of the half circumference of the cylindrical members 172 and 173, and the lower flange portion is provided so that it can be attached from above after assembling the attachment structure assemblies 180 and 190. The width is slightly narrower than that of the upper flange portion. Between the upper and lower flange portions 174, three plate members 176 extending along the generatrix of the cylindrical member 172 are provided at equal intervals along the circumference, thereby reinforcing the structure of the cylindrical member 172 and the flange portions 174, 174. doing. Similarly, between the upper and lower flange portions 175, three plate members 177 extending along the generatrix of the cylindrical member 173 are provided at equal intervals along the circumference, and the cylindrical members 173, flange portions 175, 175 The structure is reinforced. The upper and lower widths of the plate members 176 and 177 are formed approximately equal to the width of the upper and lower flange portions.

  FIG. 10 is a plan view of the accessory structure assemblies 180 and 190, which are assemblies of the riser pipe support units 170 and 171 and the accessory structures 18 and 19, and FIG. FIG. 8B shows a state before assembly.

  In the third embodiment, a pair of upper and lower top plates 200 for attaching the riser pipe support unit 170, 171 is provided between the attached structure assembly 180, 190. The top plate 200 is provided with a number of substantially oval openings 202 having a long axis in the longitudinal direction of the floating body facility 10. For example, one opening 202 is provided between each pair of bracket members 20. The sizes of the flange portions 174 and 175 of the riser tube support unit 170 and 171 are adapted to the diameters of the arc portions at both ends of each opening 202, and the flange portions 174 and 175 of the riser tube support unit 170 and 171. Are welded to arc portions at both ends of each opening 202 in accordance with the determined arrangement of the riser pipes. At this time, the plate members 176 and 177 are also welded to the plate members provided between the upper and lower top plates 200.

  As described above, also in the third embodiment, substantially the same effect as in the second embodiment can be obtained. In the configuration of the third embodiment, generation of useless units can be further suppressed, and the cost can be further reduced.

  FIG. 11 is a cross-sectional view showing the configuration of the riser support structure according to the fourth embodiment. In the riser support structure of the first to third embodiments, the riser pipe is held and fixed in the upper riser support structure 14A. However, in the riser support structure of the fourth embodiment, the lower riser support structure 15 Hold and fix the riser pipe to the floating equipment. As shown in FIG. 11, the lower riser support structure 15 of the fourth embodiment includes a riser pipe support 15 </ b> A that regulates the movement of the riser pipe R in the horizontal direction and the vertical direction. The lower riser support structure 15 is welded to the mounting base structure 22B as in the first to third embodiments. Note that another riser pipe (not shown) inserted through the upper riser support structure 14A is connected to the riser pipe R attached to the riser pipe support portion 15A. The other configurations are the same as those of the first to third embodiments. For the configuration of the structural reinforcement, for example, the web frame (26) located at the position corresponding to the uppermost portion of the mounting base structure 22B, You may reinforce by the method similar to description of 1st Embodiment. Further, the riser tube support portion 15A provided in the lower riser support structure 15 is divided into a plurality of divided units with a predetermined number of riser tubes as in the riser tube support portion 16 of the second and third embodiments. It may be composed of units.

  As described above, also in the fourth embodiment, substantially the same effects as those in the first to third embodiments can be obtained.

  Further, as a modification of the first to fourth embodiments, the bracket member 20 is directly attached to the outer plate 12 in advance at the block stage, and the riser tube support portion 16 and the attached structure portions 18 and 19 are attached to the bracket after the block connection. It is also possible to attach to the member 20. In this case, the bracket member 20 is configured as a mounting base structure and is not included in the upper riser support structure.

  Note that the structural reinforcement in the present embodiment may be other than a configuration in which the web frame is replaced with a reinforcing material.

DESCRIPTION OF SYMBOLS 10 Floating body equipment 12 Outer plate 14 Riser support structure 14A Upper riser support structure 14B, 15 Lower riser support structure 15A, 16 Riser pipe support 18, 19 Attached structure 20 Bracket member 22A, 22B Mounting base structure 26 Web Frame 28A, 28B, 30A, 30B Reinforcement material 160, 160A-160D Riser tube support unit 161, 162 Cylindrical member 170, 171 Riser tube support unit 172, 173 Cylindrical member 174, 175 Flange 200 Top plate 202 Opening R Riser tube

Claims (13)

  A floating body facility comprising an outer plate and a riser support structure attached to the outside of the outer plate, and an attachment base structure for attaching the riser support structure to the outer plate.   The floating body according to claim 1, further comprising a web frame provided in a vertical direction along an inner side of the outer plate, wherein the web frame is structurally reinforced at a position where the riser support structure is attached. Facility.   2. The riser support structure includes a riser tube support portion for inserting and holding and fixing a riser, and the mounting base structure is configured as a structure for supporting the riser tube support portion. The floating equipment as described in any one of -2.   The riser support structure is divided into a riser tube support portion for inserting and holding and fixing the riser, and a structure that is attached to the outer plate via the mounting base structure and supports the riser tube support portion. It is comprised, The floating body installation as described in any one of Claims 1-2 characterized by the above-mentioned.   The floating structure according to claim 3 or 4, wherein the structure that supports the riser pipe support portion is configured as a bracket member.   The structure for supporting the riser pipe support part is attached to the structure for supporting the riser pipe support part after the structure supporting the riser pipe support part is attached to the outer plate of the floating equipment. The floating equipment as described in any one of 3-5.   The floating body equipment according to any one of claims 3 to 6, wherein the riser pipe support portion includes a unit structure having two risers as a unit.   The floating body facility according to any one of claims 3 to 6, wherein the riser pipe support portion includes a unit structure having one riser as a unit.   The riser tube support portion includes a top plate, and the unit structure for two pieces can be attached to the top plate, and both ends in the longitudinal direction are provided with arc-shaped openings, and the arc shapes at the both ends are exhibited. 9. The floating facility according to claim 8, wherein one unit structure is attached to each part.   The floating unit according to claim 9, wherein the unit structure includes a half-circular flange portion that conforms to the arc shape.   The floating body equipment according to any one of claims 3 to 10, wherein the riser pipe support portion is disposed above the draft.   The said riser pipe | tube support part is arrange | positioned below draft, The floating body installation as described in any one of Claims 3-10 characterized by the above-mentioned. A method of manufacturing a floating facility comprising an outer plate and a riser support structure attached to the outside of the outer plate,
A mounting base structure for attaching the riser support structure to the outer plate is provided, and the riser support structure is inserted into the riser tube support part for holding and fixing the riser, and the mounting base structure is interposed therebetween. Divided into a structure that is attached to the outer plate and supports the riser tube support portion,
After attaching the structure which supports the said riser pipe | tube support part to the said outer plate, the said riser pipe | tube support part is attached to the structure which supports the said riser pipe | tube support part. The manufacturing method of the floating equipment characterized by the above-mentioned.

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