JP5771410B2 - Cooling apparatus and cooling method for steel pipe butt weld - Google Patents

Description

  The present invention relates to a steel pipe welding apparatus that performs butt matching of pipes on a laid ship when constructing a submarine pipeline, and in particular, a cooling apparatus and cooling system for a steel pipe butt weld that can quickly cool a welded portion of a steel pipe. It is about the method.

Conventionally, when constructing a submarine pipeline, steel pipes are butted on a laid ship.
Specifically, the pipe to be newly connected is connected to the end of the pipe already connected on the stopped laying ship by butt welding, and then the laying ship is advanced by the length of the pipe and is already connected at the same time. The predetermined length on the base end side of the pipe was inserted into the sea, and then the butt welding of the pipe to be newly connected on the stopped laying ship, advancement of the laying ship, and the predetermined length on the base end side of the already connected pipe Construct a submarine pipeline with repeated entry into the sea.
In addition, after the pipe to be newly connected is welded to the end of the already connected pipe, a nondestructive inspection of the welded portion is performed.

  By the way, in the butt welding work of the steel pipe on the laying ship as described above, since the forced cooling of the welded portion is not normally performed and it relies on natural cooling, there are many before the non-destructive inspection which is the next process. Time was required, resulting in a decrease in work efficiency.

  On the other hand, Patent Document 1 is known as a technique related to pipe cooling. The “steel pipe cooling method” disclosed in Patent Document 1 has a plurality of spray nozzles arranged on the circumference of a ring-shaped header so as to be inclined toward the conveying direction of the steel pipe, and the steel pipe is inserted into the central hole of the header. The cooling water is sprayed from the spray nozzle toward the steel pipe so that the collision pressure at the center of the collision portion of the steel pipe is 2 kPa or more. And the steel pipe is uniformly cooled in both the circumferential direction and the axial direction without generating a vapor film by the cooling water jetted from the spray nozzle in this way.

JP 2008-261018 A

By the way, Patent Document 1 is a cooling technique for obtaining desired characteristics after manufacturing a steel pipe, and the cooling technique cannot be applied to butt welding of a steel pipe on a laid ship as it is.
Specifically, a large amount of cooling water is required for cooling, but in the limited work space on the ship, the cooling water that scatters hinders other operations, and butt welds of steel pipes However, there is a problem that the positioning of the spray nozzles when the spray nozzles are opposed to each other is troublesome, and a new technique has been expected to be provided to solve this problem.

  The present invention has been made in view of the above-described circumstances, and by performing forced cooling of the butt weld portion of the steel pipe on the laying ship, the nondestructive inspection of the next process can be quickly performed, and the ship A cooling device and a cooling method for a steel pipe butt weld that can efficiently cool a weld in a limited space.

In order to solve the above problems, the present invention proposes the following means.
In the cooling device for a steel pipe butt weld according to claim 1 of the present application, the steel pipe butt weld is formed in a box shape as a whole and is movably provided so as to be close to and away from each other. A pair of half-shaped casing portions having a semicircular concave portion sandwiching from the surroundings, and disposed inside the half-shaped casing portion and outside the semicircular concave portion, when steel tube surrounded by butting the facing portion said halves shaped casing portion, by comprising a nozzle apparatus having a spray nozzle for injecting cooling water toward the welded portion of the steel pipe which is held between the concave portion Features.
The box shape referred to here includes not only a cube and a rectangular parallelepiped but also a polygonal columnar body, and means a hollow three-dimensional shape through which a steel pipe can be inserted.

  According to the cooling apparatus for a steel pipe butt weld portion of the present invention, a pair of half-shaped casing portions having a semicircular concave portion into which a cylindrical steel pipe is fitted and formed in a box shape as a whole are provided. In the state where the welded portion of the steel pipe is positioned between the two, the half-shaped casing is formed by relatively moving and approaching each other so that the facing portions of the half-shaped casing portions are abutted to surround the welded portion of the inner steel pipe. Since the cooling water is sprayed through the spray nozzle toward the welded part of the steel pipe in the part, the welded part of the steel pipe immediately after welding can be promptly cooled in the halved casing part. In addition, since the cooling water can be injected and collected in the half-shaped casing portion, even on a ship with a limited space, the cooling water is not scattered around and the forced cooling of the welded portion of the steel pipe immediately after welding can be performed. It becomes possible. Moreover, since the casing is halved, the casing and the spray nozzle associated therewith can be easily mounted from the outside of the steel pipe so as to face the welded portion of the steel pipe.

  Moreover, in the cooling device for a steel pipe butt weld part shown in claim 2 of the present application, the spray nozzle is located in the half-shaped casing part and outside the semicircular concave part along the circumferential direction of the steel pipe. And a plurality of them are arranged at regular intervals.

  According to the cooling apparatus for a steel pipe butt weld portion of the present invention, the spray nozzle is constant in the half-shaped casing portion and outside the semicircular concave portion, along the concave portion, that is, along the circumferential direction of the steel pipe. The cooling water can be uniformly sprayed through the spray nozzle to the welded portion of the steel pipe sandwiched between the concave portions, so that the cooling of the welded portion of the steel pipe can be uniformly performed. It can be carried out.

  Further, in the cooling device for a steel pipe butt weld portion shown in claim 3 of the present application, the half-shaped casing portion is provided so as to be movable so as to approach and separate in the vertical direction.

  According to the cooling apparatus for a steel pipe butt welded portion of the present invention, the half-shaped casing portion is provided so as to be movable so as to be closely spaced in the vertical direction, so that the half-shaped casing portion does not spread laterally when opening and closing. Therefore, the space on the side of the half-shaped casing portion can be used effectively, and efficient forced cooling can be performed even on a ship with a limited space.

  Further, in the cooling device for a steel pipe butt weld portion shown in claim 4 of the present application, the spray nozzle belonging to the upper half-shaped casing portion is more than the number of spray nozzles belonging to the lower half-shaped casing portion. It is characterized by being arranged in large numbers.

  According to the cooling apparatus for steel pipe butt welds of the present invention of this invention, the number of spray nozzles suitable for cooling the steel pipe butt welds is arranged. That is, after the cooling water sprayed from the spray nozzle arranged on the upper side hits the welded portion of the steel pipe, it flows downward along the welded portion of the steel pipe under the influence of gravity. That is, the cooling water sprayed above the welded portion of the steel pipe flows below the welded portion of the steel pipe, in addition to the coolant sprayed from the spray nozzle disposed opposite thereto. As a result, the number of the spray nozzles belonging to the lower half-shaped casing portion is sufficient.

  Further, in the cooling device for a steel pipe butt weld portion shown in claim 5 of the present application, the half-shaped casing portion and the nozzle device are mounted on a movable carriage.

  According to the cooling apparatus for a steel pipe butt weld portion of the present invention, the moving carriage can be moved together according to the position of the weld portion of the steel pipe to be cooled. For this reason, a spray nozzle can be easily arrange | positioned in the position facing the welding part of a steel pipe. Further, since the casing and the nozzle device can be arranged at a required location only when necessary, and can be arranged at a position deviated from the required location when not needed, space can be effectively used on a ship, for example.

  Moreover, in the cooling method of the steel pipe butt weld part shown by Claim 6 of this application, In the cooling method of the steel pipe butt weld part which uses the cooling device of the steel pipe butt weld part of any one of Claims 1-5, The pair of halved casing parts are moved relative to each other in a state where the welded part of the steel pipe is positioned between them and the opposed parts of the halved casing parts are abutted to each other. After surrounding the welded part of the steel pipe, cooling water is sprayed through the spray nozzle toward the welded part of the steel pipe in the half-shaped casing part.

  According to the method for cooling a steel pipe butt weld portion of the present invention, the steel pipe butt weld portion cooling device according to any one of claims 1 to 5 is used to Forced cooling can be performed promptly.

According to the cooling device for a steel pipe butt weld portion shown in claim 1 of the present application, the weld portion of the steel pipe immediately after welding can be promptly cooled in the half-shaped casing portion. In addition, cooling water can be injected and collected in the half-shaped casing, so that even on a ship with limited space, it is possible to forcibly cool the welded part of the steel pipe immediately after welding without splashing cooling water around it. It becomes. Moreover, since the casing is halved, the casing and the spray nozzle associated therewith can be easily mounted from the outside of the steel pipe so as to face the welded portion of the steel pipe.
In other words, the steel pipe butt welded part cooling device of the present invention forcibly cools the welded part of the steel pipe immediately after butting on the laying ship, and can promptly proceed with the nondestructive inspection of the next process. This makes it possible to efficiently cool the welded portion of the steel pipe in the space provided.

  Further, according to the cooling device for a steel pipe butt weld portion shown in claim 2 of the present application, cooling water can be uniformly injected through the spray nozzle to the weld portion of the steel pipe sandwiched between the concave portions, Cooling of the welded portion of the steel pipe can be performed uniformly.

  Moreover, according to the cooling device for a steel pipe butt weld portion shown in claim 3 of the present application, the space on the side of the half-shaped casing portion can be effectively used, and the efficiency is improved even on a ship with limited space. Good forced cooling is possible.

  According to the cooling device for a steel pipe butt weld portion shown in claim 4 of the present application, the number of spray nozzles belonging to the upper half-shaped casing portion and the number of spray nozzles belonging to the lower half-shaped casing portion are preferably It will be arranged, and it is excellent in terms of labor saving.

  Moreover, in the cooling device of the steel pipe butt weld part shown in claim 5 of this application, according to the position of the welding part of the steel pipe which is a cooling object, it can move with every moving trolley. The spray nozzle can be easily arranged at the facing position. Further, since the nozzle device can be arranged at a required location only when necessary, and can be arranged at a position deviated from the necessary location when unnecessary, for example, space can be effectively used on a ship.

  Moreover, in the cooling method of the steel pipe butt welding part shown by Claim 6 of this application, the welding part of the steel pipe immediately after welding in a casing part can be forcedly cooled rapidly.

It is a schematic side view which shows the laying ship to which the cooling device and cooling method of a steel pipe butt-welding part based on this invention are applied. FIG. 2 is a front view of the cooling device shown in FIG. 1, in a state where a casing is opened. It is a figure which shows the cooling device of FIG. 2 in detail, Comprising: (a) is a top view, (b) is a front view in the state which the casing part closed, (c) is the cc line of FIG.3 (b). FIG. (A) is a front view which shows the arrangement state of the spray nozzle of the casing located in an upper side, (b) is sectional drawing which shows the specific structure of a spray nozzle, (c) is a bottom view of FIG.4 (b).

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a laying ship 1 to which a cooling device and a cooling method for a steel pipe butt weld according to the present invention are applied.
On this laid ship 1, from the bow to the stern, alignment and the first welding stage S1, the second welding stage S2, the third welding stage S3, the non-destructive inspection stage S4, the anticorrosion ground treatment stage S5. The anticorrosion treatment stage S6 is sequentially arranged for each length of the steel pipe to be connected.

  On the laying ship 1, both pipes are aligned so that the end of the already connected steel pipe Pb and the steel pipe Pa to be newly connected are on the same axis line in the first welding stage S <b> 1. After that, the steel pipe Pa to be newly connected to the end of the already connected steel pipe Pb is abutted and welded. In the second and third welding stages S2 and S3, additional welding is performed at further necessary positions with respect to the positioning and the welding positions performed in the first welding stage S1. As a result, the steel pipe Pa to be newly connected is connected to the already connected steel pipe Pb. In the nondestructive inspection stage S4, it is inspected whether or not the butt weld is properly welded.

Here, when it is determined that the welding is not properly performed, the welded portion is repaired at the subsequent stage of the stage S4. On the other hand, when it is determined that the welding has been properly performed, the base is further processed after the base of the weld is adjusted in the anticorrosion base processing stage S5. Further, in the anticorrosion treatment stage S6, the steel tube Pb that has been ground-treated is covered with an anticorrosion treatment in which the outer periphery of the tube is covered with urethane after being covered with a heat shrinkable tube. These series of steps are performed simultaneously with the laying ship 1 stopped. However, considering the connected or connected pipe as a reference, the steps are sequentially performed from the distal end side toward the proximal end side. When a series of steps at each of these work stages is completed, the laying ship is advanced by the length of the pipe to be newly connected (for example, 12 m), and at the same time, a predetermined length on the proximal end side of the steel pipe Pb that has already been connected. Into the sea.
Thereafter, a series of steps are performed at each work stage on the suspended laying ship, and the submarine pipe is sequentially repeated by advancing the laying ship and throwing it into the sea of a predetermined length on the base end side of the already connected pipe. Laying it while building the line.

Between the third welding stage S3 and the nondestructive inspection stage S4, which is the final of the welding process, a cooling device 10 for a steel pipe butt weld is disposed on the base.
As shown in FIGS. 2 and 3, the cooling device 10 is provided in a movable manner so as to be close to and away from each other, and is formed in a box shape as a whole so as to sandwich a cylindrical steel pipe Pb from the periphery. A casing 12 comprising a pair of half-shaped casing portions 12A having a concave-shaped concave portion 11, and a half-shaped casing portion disposed within the half-shaped casing portion 12A and outside the semicircular concave portion 11 when steel tube surrounded by halved shaped casing portion 12A of matching the opposing portions 12AA of 12A between the sign in the weld of the inner steel pipe of the steel pipe Pb is sandwiched between the concave portion 11 and the casing 12 (FIG. 3 (c) M ), And a nozzle device 14 having a plurality of spray nozzles 13 for injecting cooling water toward the weld M of the steel pipe, and the casing 12 and the nozzle device 14. Comprising a movable cart 15 to be mounted.
The casing 12 forms a rectangular parallelepiped as a whole as shown in FIG. The shape of the casing 12 is not limited to a rectangular parallelepiped, but may be a cube or other polygonal columnar body.

In addition, the half-shaped casing portion 12A is provided on a plurality of support pipes 20 arranged in the vertical direction so as to be movable in the vertical direction via the slide member 21, so that the half-shaped casing portion 12A is located on the upper side. The casing portion 12A and the lower half-shaped casing portion 12A are close to and away from each other.
Various fixing means such as bolts and pins are used to fix the slide member 21 to the support pipe 20. Further, the switching of the casing 12 when the steel pipe is surrounded and opened may be performed manually, or may be performed automatically by providing a drive mechanism that moves mechanically up and down.

The semicircular concave portion 11 forms a circle as a whole when the upper half-like casing portion 12A and the lower half-like casing portion 12A come close to each other and come into contact with each other. The inner diameter dimension is set so that the steel pipe Pb is fitted and closely adhered to the peripheral edge.
Further, as shown in FIG. 3C, a silicon rubber 22 that contacts the steel pipe Pb is disposed on the circumferential surface along the concave portion 11 of the half-shaped casing portion 12A. When 12 is closed, the inside is sealed.

The spray nozzles 13 of the nozzle device 14 are arranged at regular intervals along the concave portion 11 at positions outside the semicircular concave portion 11.
As shown in FIGS. 2 and 3 (b), the spray nozzles 13 are arranged at regular intervals on the support member 23 arranged below the concave portion 11 in the halved casing portion 12A located on the lower side. In the half-shaped casing portion 12A located on the upper side, as shown in FIGS. 2, 3 (b), and 4 (a), the concave portion 11 is formed along the circumferential direction of the steel pipe Pb. It arrange | positions at the fixed interval (for example, as shown in FIG. 4 (a) at 5 degree intervals) in the circular arc-shaped pipe 24 arrange | positioned in parallel with this concave part 11 in the outward position.
The support member 23 is supported by the lower half casing portion 12A via a stay (not shown), and the arc-shaped pipe 24 is supported by the upper half casing portion 12A via a stay (not shown). The
The spray nozzle 13 belonging to the upper half-shaped casing part can inject cooling water into the upper half of the welded part M of the steel pipe, and the spray nozzle 13 belonging to the lower half-shaped casing part is provided with a steel pipe. It arrange | positions so that a cooling water can be sprayed to a part (angle part of about 120 degree | times) except the both sides among the lower half of this welding part M. Further, the spray nozzles 13 belonging to the upper half-shaped casing part 12A are arranged more than the number of spray nozzles 13 belonging to the lower half-shaped casing part 12A.

Further, as the shape of the spray nozzle 13, for example, as shown in FIG. 4B, the cooling water is ejected from the ejection hole 13B formed in the cylindrical body 13A as a whole and provided at the center of the tip thereof. The configuration is used.
Further, the cooling water supply pipe 30 communicating with the pipe 24 and the pipe 23A in the support member 23 is connected to a tank 31 in which cooling water is stored, as shown in FIG. The compressed air is supplied from the air compressor 33 through the air hose 32.
Thereby, when compressed air is supplied from the air compressor 33, the cooling water in the tank 31 at that pressure causes the cooling water supply pipe 30, the pipe 24, and the pipe 23 </ b> A in the support member 23 to move upward and downward. It is supplied to the spray nozzle 13 located in the casing section 12 a.

And in the cooling device 10 comprised as mentioned above, after the welding process is completed in welding stage S1-S3, the welding part M of the steel pipe of the steel pipe Pb is cooled in the cooling device 10 provided immediately after that. The
That is, in this cooling device 10, the pair of half-shaped casing portions 12A in an open state are moved relatively close to each other with the welded portion M of the steel pipe positioned therebetween, and the half-shaped casing portions After facing the facing portions 12AA of the portions 12A and surrounding the welded portion of the internal steel pipe, the air compressor 33 is driven. Then, the water in the tank 31 is supplied to the spray nozzle 13 through the cooling water supply pipe 30 by the pressure of the air compressor 33. As a result, cooling water is sprayed from the spray nozzle 13 toward the welded portion M of the steel pipe, and the welded portion M of the steel pipe is forcibly cooled by the cooling water. On the other hand, the water after being used for cooling in the casing 12 is discharged through a drainage portion (not shown) provided in the half-shaped casing portion 12A located on the lower side.

As described above in detail, according to the cooling device 10 of the steel pipe butt weld M shown in the present embodiment, it is movable so as to be close to and away from each other, and is formed in a box shape as a whole, and has a cylindrical shape. A pair of half-casing casing portions 12A having a semicircular concave portion 11 sandwiching the steel pipe from the periphery are provided, and the half-casing casing portions 12A are in a state where the welded portion M of the steel pipe is positioned between them. Then, after moving relative to each other and bringing the opposed portions 12AA of the half-shaped casing portions into contact with each other to surround the welded portion of the steel pipe, cooling water is sprayed from the spray nozzle 13 toward the welded portion M of the steel pipe. Since it did in this way, the welding part M of the steel pipe immediately after welding in this casing 12 can be forcedly cooled rapidly. In addition, since the cooling water can be injected and collected in the casing 12, forced cooling immediately after welding is possible even on a ship with a limited space. In addition, since the cooling water can be injected and collected in the casing 12, even on a ship with a limited space, it is possible to forcibly cool the welded portion M of the steel pipe immediately after welding without splashing around the cooling water. . Moreover, since the casing 12 is halved, the casing 12 and the spray nozzle 13 associated therewith can be easily mounted from the outside of the steel pipe Pb so as to face the welded portion M of the steel pipe.
That is, in the steel pipe cooling device 10, forced cooling of the welded portion M of the steel pipe immediately after abutment is performed on the laid ship by a simple structure called a cooling device for the welded portion M of the steel pipe composed of the casing 12 and the spray nozzle 13. The nondestructive inspection in the next process can be promptly advanced, and the steel pipe welded portion M can be efficiently cooled in a limited space on the ship.

  Further, in the cooling device 10, the spray nozzles 13 are arranged at regular intervals along the circumferential direction of the steel pipe Pb, that is, along the concave portion 11, at positions outside the semicircular concave portion 11. The cooling water can be uniformly sprayed through the spray nozzle 13 to the welded part M of the steel pipe sandwiched between the concave parts 11, and the cooling process of the welded part M of the steel pipe can be performed uniformly.

Further, in the cooling apparatus 10, by movably providing it to close to or away from the casing part 12 A in the vertical direction, it is possible to effectively utilize the space on the side of the casing portion 12 A, limited space Efficient forced cooling is possible even on boarded ships.
Moreover, in the said cooling device, the said spray nozzle 13 which belongs to an upper half-shaped casing part is arrange | positioned more than the number of the said spray nozzles which belong to a lower half-shaped casing part. This is because the cooling water sprayed from the spray nozzle arranged on the upper side hits the welded portion of the steel pipe and then flows downward along the welded portion of the steel pipe under the influence of gravity. In addition to the cooling water sprayed from the spray nozzle disposed opposite thereto, the cooling water sprayed to the upper side of the welded portion of the steel pipe also flows to the lower side of the welded portion. This is because the number of the spray nozzles belonging to the split casing portion is sufficient.
That is, the number of spray nozzles belonging to the upper half-shaped casing portion 12A and the number of spray nozzles belonging to the lower half-shaped casing portion 12A are suitably arranged, which is excellent in terms of labor saving. ing.
Furthermore, in the cooling device 10, in accordance with the position of the welded portion M of the steel pipe which is to be cooled, can be moved by the cart 1 5, Therefore, the spray nozzle 13 at a position opposed to the welded portion M of the steel pipe Can be easily arranged. Further, since the casing 12 and the nozzle device 14 can be arranged at a required location only when necessary, and can be arranged at a position deviated from the required location when not needed, for example, space can be effectively used on the ship.

  In addition, in the said embodiment, although the arrangement | positioning form of the spray nozzle 13 in the half-shaped casing part 12A located in the upper side and the half-shaped casing part 12A located in the lower side was varied, it is not limited to this, and the same It is also good. For example, the spray nozzle 13 located on the lower side may be arranged at regular intervals on the arc-shaped pipe 24 arranged in parallel with the concave portion 11 at the outer position of the concave portion 11 as in the upper side. .

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  The present invention relates to a method for cooling a steel pipe butt weld and a device therefor for forcibly cooling the butt weld of a steel pipe on a laying ship when constructing a submarine pipeline.

DESCRIPTION OF SYMBOLS 1 Laying ship 10 Cooling device 11 Recessed part 12 Casing 12A Half-shaped casing part 12AA Opposed part 13 of half-shaped casing parts Spray nozzle 14 Nozzle device 15 Moving carriage Pa Steel pipe Pb Steel pipe M Steel pipe welded part

Claims (6)

A pair of halves having a semicircular concave part that is provided so as to be movable close to and away from each other and that is formed in a box shape as a whole and sandwiches a butt welded part of a cylindrically formed steel pipe from the periphery. A casing part;
Is located outside the position of the semi-split-shaped casing portion a and semicircular concave portion, when the steel pipe surrounded by the half-shaped casing portion the halves shaped casing portion abutting the facing portion of each other between the concave portion And a nozzle device having a spray nozzle for injecting cooling water toward the welded portion of the sandwiched steel pipe, and a cooling device for a steel pipe butt welded portion.   The spray nozzle is disposed in the half-shaped casing part and outside the semicircular concave part at a predetermined interval along a circumferential direction of the steel pipe. The cooling apparatus of the steel pipe butt-welding part of Claim 1.   3. The cooling device for a steel pipe butt weld according to claim 1, wherein the half-shaped casing is movably provided so as to be closely spaced in the vertical direction.   4. The steel pipe butt welding according to claim 3, wherein the spray nozzles belonging to the upper half-shaped casing part are arranged more than the number of the spray nozzles belonging to the lower half-shaped casing part. Cooling device.   The cooling device for a steel pipe butt weld according to any one of claims 1 to 4, wherein the half-shaped casing part and the nozzle device are mounted on a movable carriage. A method for cooling a steel pipe butt weld using the cooling device for a steel pipe butt weld according to any one of claims 1 to 5,
The pair of halved casing parts are moved relative to each other in a state where the welded part of the steel pipe is positioned between them, and the opposed parts of the halved casing parts are brought into contact with each other so that the inner steel pipe A cooling method for a steel pipe butt weld, wherein the cooling water is sprayed through the spray nozzle toward the welded part of the steel pipe in the half-shaped casing part after surrounding the welded part.

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