Piping system and construction method for piping system

Abstract

A piping system and a construction method for the piping system are provided that enable new piping to be smoothly inserted into existing piping. [Solution] The piping system 100 comprises a first insertion sheath pipe 20 that is inserted into an existing piping 10, and a first new piping 30 that is inserted into the first insertion sheath pipe 20 and has a fluid flowing inside.

Description

[Technical Field]

[0001] The present disclosure relates to a piping system and a method for installing a piping system. [Background technology]

[0002] Conventionally, new pipes are laid inside existing pipes. Patent Document 1 discloses an existing pipe, a new pipe to be inserted into the existing pipe, and a small-diameter pipe to be inserted into the new pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-42679 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, there is room for improvement in smoothly inserting a new pipe into an existing pipe.

[0005] An object of the present disclosure is to provide a piping system and a construction method for a piping system that enable new piping to be smoothly inserted into existing piping. [Means for solving the problem]

[0006] A piping system according to one embodiment of the present disclosure comprises a first insertion sleeve pipe to be inserted into an existing piping, and a first new piping inserted into the first insertion sleeve pipe and through which a fluid flows. [Effects of the Invention]

[0007] According to the present disclosure, new piping can be smoothly inserted into existing piping. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram for explaining a piping system according to a first embodiment of the present disclosure. [Figure 2] 1 is a partial vertical cross-sectional view showing a part of a piping system according to a first embodiment of the present disclosure. [Figure 3] FIG. 6 is a partial vertical cross-sectional view showing a part of a piping system according to a second embodiment of the present disclosure. [Figure 4A] FIG. 10 is a partial cross-sectional view for explaining a construction method for a piping system according to a second embodiment of the present disclosure. [Figure 4B] FIG. 10 is a partial cross-sectional view for explaining a construction method for a piping system according to a second embodiment of the present disclosure. [Figure 5] 10 is a flowchart showing a piping system installation method according to a second embodiment of the present disclosure. [Figure 6] 10 is a flowchart showing a modified example of the construction method for a piping system according to the first embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] As existing pipelines for oil, gas, water, etc. age, a so-called pipe-in-pipe method is known in which a new pipe is installed inside the existing pipeline to replace the old pipeline. For example, the pipe-in-pipe method is used to replace existing pipelines installed on the seabed. However, the existing pipeline does not have to be located on the seabed; for example, the existing pipeline may be located on land or underground.

[0010] First Embodiment (Piping System) The replacement of aging existing pipes is carried out by installing pipes with a smaller diameter inside the existing pipes. A piping system 100 according to this embodiment will be described with reference to Figures 1 and 2. In this embodiment, the piping system 100 is installed on the seabed G. The piping system 100 is used, for example, for transporting oil and gas. Fig. 1 is a schematic diagram for explaining a piping system 100 according to this embodiment. Fig. 2 is a partial vertical cross-sectional view showing a part of the piping system 100 according to this embodiment. In Fig. 2, the existing piping 10 and the first insertion sheath pipe 20 are shown in cross section.

[0011] The existing pipe 10 is, for example, a subsea pipe used in an oil storage base or an offshore oil or gas receiving facility. The existing pipe 10 is, for example, a pipe for transporting oil from an oil tanker moored at a sea berth to a refinery or tank on land. The existing pipe 10 is installed on the seabed G and needs to be replaced with a new pipe due to corrosion or the like. The cross section of the existing pipe 10 is, for example, a long pipe with a circular shape. The cross section of the existing pipe 10 is not limited to a circular shape, and may have a space inside that allows the insertion of a new pipe (for example, a first insertion sheath pipe 20 described below). The material of the existing pipe 10 is, for example, SS400. The existing pipe 10 may be made of, for example, stainless steel, steel, or metal. The length of the existing pipe 10 is, for example, 500 m to 5000 m. The outer diameter of the existing pipe 10 is, for example, 500 A. 1, one end of the existing piping 10 is placed, for example, on the seabed G and connected to onshore piping (not shown) that connects to an onshore refinery or tank. The other end of the existing piping 10 is placed, for example, on the seabed G and connected, for example, to an oil tanker via a pipe (not shown).

[0012] As shown in FIG. 2, the piping system 100 includes a first insertion sheath pipe 20 and a first new piping 30. The first insertion sleeve pipe 20 is inserted into the existing piping 10. The outer diameter of the first insertion sleeve pipe 20 is smaller than the inner diameter of the existing piping 10. The first insertion sleeve pipe 20 is a pipe having an outer diameter that can be inserted into the inside of the existing piping 10. The cross section of the first insertion sleeve pipe 20 is, for example, a circular, long pipe. The cross section of the first insertion sleeve pipe 20 is not limited to a circular shape, and it is sufficient that there is a space inside that can accommodate the insertion of the first new piping 30 described below. The material of the first insertion sleeve pipe 20 is, for example, carbon steel. The length of the first insertion sleeve pipe 20 is, for example, 12 m to 120 m. The outer diameter of the first insertion sleeve pipe 20 is, for example, 400 A.

[0013] The first new pipe 30 is inserted into the first insertion sleeve pipe 20. The outer diameter of the first new pipe 30 is smaller than the inner diameter of the first insertion sleeve pipe 20. The first new pipe 30 is a pipe having an outer diameter that can be inserted into the first insertion sleeve pipe 20. The cross section of the first new pipe 30 is, for example, a circular, long pipe. The cross section of the first new pipe 30 is not limited to being circular. A fluid such as gas or oil flows inside the first new pipe 30. The material of the first new pipe 30 is, for example, carbon steel. The length of the first new pipe 30 is, for example, 12 m to 120 m. The outer diameter of the first new pipe 30 is, for example, 300 A.

[0014] In this way, the first insertion sheath pipe 20 and the first new pipe 30 are arranged, in that order from the outside, inside the existing pipe 10. When viewed in the longitudinal direction of the existing pipe 10, a first space R1 between the existing pipe 10 and the first insertion sheath pipe 20 is filled with seawater. A second space R2 between the first insertion sheath pipe 20 and the first new pipe 30 is filled with a gas such as air during construction.

[0015] A plurality of spacers 4 may be provided at predetermined intervals on the outer peripheral surface of the first new pipe 30 in the longitudinal direction of the first new pipe 30. As shown in FIG. 2, the outer diameter of the spacer 4 is larger than the outer diameter of the first new pipe 30. The spacers 4 may be provided so as to cover the entire circumferential direction of the first new pipe 30, or so as to cover a portion of the circumferential direction. The spacers 4 may be provided, for example, at intervals of 5 to 6 meters in the longitudinal direction of the first new pipe 30. The outer peripheral surface of the first new pipe 30 may be painted. The paint may be, for example, a functional paint. The paint may be, for example, a paint having anticorrosion properties. The spacers 4 may be provided, for example, to protect the paint on the outer peripheral surface of the first new pipe 30. In other words, when the first new piping 30 is placed inside the first insertion sheath pipe 20, the spacer 4 can prevent the paint on the outer surface of the first new piping 30 from coming into contact with the inner surface of the first insertion sheath pipe 20. If the piping system 100 does not include the first insertion sheath pipe 20, when the first new piping 30 is inserted into the existing piping 10, the multiple spacers 4 will come into contact with the inner surface of the existing piping 10, and although this will make it easier to protect the paint on the outer surface of the first new piping 30, it may be difficult to perform this insertion smoothly. Furthermore, for example, there may be a plurality of irregularities 21 (first irregularities described later) on the inner peripheral surface of the existing pipe 10. This is due to, for example, a protruding obstacle on the inner peripheral surface of the existing pipe 10 or a plurality of backing metals. The plurality of backing metals are provided on the inner peripheral surface of the existing pipe 10 at predetermined intervals in the longitudinal direction of the existing pipe 10. For example, the plurality of backing metals are provided at intervals of 6 m in the longitudinal direction of the existing pipe 10. The presence of a plurality of backing metals in the existing pipe 10 may mean, for example, that the existing pipe 10 was manufactured by welding a plurality of pipes using the backing metals. If the piping system 100 does not include the first insertion sheath tube 20, when the first new piping 30 is inserted into the existing piping 10, multiple irregularities (e.g., backing metal) 21 will come into contact with the outer surface of the first new piping 30 or the spacer 4, making it difficult to insert the first new piping 30 smoothly. In this embodiment, the outer peripheral surface of the first insertion sleeve tube 20 is unpainted, and therefore there is no need to provide a spacer 4 from the viewpoint of protecting the paint. Furthermore, the inner peripheral surface of the first insertion sleeve tube 20 does not have any irregularities 21 such as a backing metal, but they may be present.

[0016] The piping system 100 according to this embodiment is not configured to directly insert the first new pipe 30 into the existing pipe 10, but is provided with a first insertion sleeve pipe 20 into which the first new pipe 30 is inserted. By inserting the first insertion sleeve pipe 20 into which the first new pipe 30 is inserted into the existing pipe 10, it is possible to reduce frictional resistance between the existing pipe 10 and the first new pipe 30 caused by the multiple spacers 4 and the multiple unevenness 21. With this configuration, the first new pipe 30 can be smoothly inserted into the existing pipe 10.

[0017] Furthermore, the second space R2 between the first insertion sheath pipe 20 and the first new piping 30 is filled with a gas such as air during insertion. The buoyancy of the filled gas reduces the force applied from the first insertion sheath pipe 20 to the bottom surface of the existing piping 10 in the direction of gravity, thereby reducing the frictional resistance between the existing piping 10 and the first insertion sheath pipe 20. After insertion, the gas such as air may be replaced with a liquid such as seawater to adjust the weight to counter the risk of floating up. Furthermore, the second space R2 reduces the weight during construction, thereby reducing the required construction equipment specifications and the difficulty of construction, contributing to a reduction in process costs.

[0018] The piping system 100 may include a retraction member 32 . The retraction member 32 includes a ring-shaped member 33 and a cord-like body 34, which will be described later. The retraction member 32 is a member for retracting the first new pipe 30 together with the first insertion sleeve pipe 20 into the existing pipe 10. The retraction member 32 is provided at an end of the first new pipe 30 in the longitudinal direction thereof, in the direction in which the first new pipe 30 is inserted into the first insertion sleeve pipe 20 (second direction X2). The retraction member 32 is an extension of the first new pipe 30. When the retraction member 32 is connected to the first new pipe 30, the retraction member 32 and the first new pipe 30 become one body. Note that, in the longitudinal direction of the first new pipe 30, the direction opposite to the direction in which the first new pipe 30 is inserted into the first insertion sleeve pipe 20 (second direction X2) is the first direction X1. In addition, in the longitudinal direction of the first new piping 30, the direction (second direction X2) in which the first new piping 30 is inserted into the first insertion sheath pipe 20 may be referred to as the front, and the direction (first direction X1) opposite to the direction (second direction X2) in which the first new piping 30 is inserted into the first insertion sheath pipe 20 may be referred to as the rear. Note that, for example, in the process of assembling the first new piping 30 and the first insertion sleeve pipe 20 on land, the retraction member 32 may be retracted in the second direction X2 relative to the first insertion sleeve pipe 20, thereby inserting the retraction member 32 and the first new piping 30 into the first insertion sleeve pipe 20. The material of the retraction member 32 is, for example, carbon steel.

[0019] A ring-shaped member 33 may be provided at the end of the first new pipe 30 in the second direction X2. A cord-like body 34 is connected to the ring-shaped member 33 for pulling both the first new pipe 30 and the first insertion sheath pipe 20 into the existing pipe 10. The cord-like body 34 is, for example, a pull-in wire or a pull-in rope. The end of the cord-like body 34 opposite to the end connected to the ring-shaped member 33 is connected to, for example, a winch (not shown). The winch is installed, for example, on land or on a ship.

[0020] The piping system 100 according to this embodiment includes a pulling member 32 for pulling the first new piping 30 and the first insertion sheath pipe 20 into the existing piping 10. With this configuration, the first new piping 30 can be smoothly inserted into the existing piping 10.

[0021] The piping system 100 may include a plug member 22 . The plug member 22 is provided at an end of the first insertion sleeve pipe 20, at an end on the side in the direction in which the first insertion sleeve pipe 20 is inserted into the existing piping 10 (second direction X2). The plug member 22 connects the first insertion sleeve pipe 20 and the first new pipe 30. Because the first insertion sleeve pipe 20 and the first new pipe 30 are connected by the plug member 22, both the first insertion sleeve pipe 20 and the first new pipe 30 can be inserted into the existing piping 10 by pulling in at least one of the first insertion sleeve pipe 20 or the first new pipe 30. The plug member 22 may be provided so as to cover the end of the first insertion sleeve pipe 20. The plug member 22 may be provided at an end on the side in the direction opposite to the direction in which the first insertion sleeve pipe 20 is inserted into the existing piping 10 (first direction X1). The plug member 22 is made of a material such as carbon steel, for example.

[0022] The piping system 100 according to this embodiment includes a plug member 22 at the end of the first insertion sleeve pipe 20 on the side of the second direction X2. This configuration makes it possible to easily fill the second space R2 between the outer circumferential surface of the first new pipe 30 and the inner circumferential surface of the first insertion sleeve pipe 20 with a gas such as air during insertion. The buoyancy of the filled gas reduces the force applied from the first insertion sleeve pipe 20 to the bottom surface of the existing pipe 10 in the direction of gravity, thereby reducing the frictional resistance between the existing pipe 10 and the first insertion sleeve pipe 20. This allows the first insertion sleeve pipe 20 to be smoothly inserted into the existing pipe 10.

[0023] The first new piping 30 protrudes from the first insertion sleeve pipe 20. The first new piping 30 protrudes in the longitudinal direction from the end of the first insertion sleeve pipe 20 at the end on the second direction X2 side. The plug member 22 is inserted through the portion of the first new pipe 30 that protrudes from the first insertion sleeve pipe 20 (forward protruding portion 35). The plug member 22 has a through hole 23 through which the first new pipe 30 is inserted. The plug member 22 is annular. The forward protruding portion 35 of the first new pipe 30 passes through the through hole 23 of the plug member 22. The through hole 23 may have any structure that allows the first new pipe 30 to be inserted and prevents leakage of air, etc., that fills the second space R2 during insertion. It is sufficient that the inner peripheral surface of the through hole 23 and the outer peripheral surface of the first new pipe 30 are in close contact with each other.

[0024] In the piping system 100 according to this embodiment, the first new pipe 30, which has an outer diameter smaller than the inner diameter of the first insertion sheath pipe 20, protrudes from the first insertion sheath pipe 20, so that the first new pipe 30 and the first insertion sheath pipe 20 can be easily pulled and inserted into the existing pipe 10. Furthermore, even when the first new pipe 30 protrudes from the first insertion sheath pipe 20 in this manner, the plug member 22 is used, so that the second space R2 between the outer peripheral surface of the first new pipe 30 and the inner peripheral surface of the first insertion sheath pipe 20 can be easily filled with a gas such as air during insertion. This allows the first insertion sheath pipe 20 to be smoothly inserted into the existing pipe 10.

[0025] The piping system 100 includes a rib member 24. However, the rib member 24 may be omitted. The rib member 24 is connected to the plug member 22 and the portion of the first new pipe 30 that protrudes from the first insertion sleeve pipe 20 (forward protruding portion 35). The rib member 24 is a flat plate member. The rib member 24 has, for example, a triangular shape (a right-angled triangle in the illustrated example) in a plan view. The rib member 24 is not limited to a triangular shape in a plan view, and may have, for example, a trapezoidal shape. The rib member 24 may also have a truncated cone shape. The material of the rib member 24 is, for example, carbon steel. The rib member 24 is disposed so as to be inclined in the second direction X2 in a plan view of the first new piping 30 (for example, as viewed from the arrow in FIG. 2, i.e., as viewed from the arrow perpendicular to the longitudinal direction of the first new piping 30). That is, the rib member 24 has an inclined portion (in the case of a triangle, the portion corresponding to the hypotenuse) that inclines so as to approach the first new piping 30 as it moves in the second direction X2 in a plan view of the first new piping 30. A plurality of rib members 24 are arranged at intervals in the circumferential direction on the outer peripheral surface of the first new pipe 30. The rib members 24 are preferably arranged at equal intervals in the circumferential direction on the outer peripheral surface of the first new pipe 30. For example, it is preferable that 4 to 12 rib members 24 are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the first new pipe 30. When four rib members 24 are arranged on the outer peripheral surface of the first new pipe 30, it is preferable that the rib members 24 are arranged at 90° intervals when viewed from the longitudinal direction of the first new pipe 30. When twelve rib members 24 are arranged on the outer peripheral surface of the first new pipe 30, it is preferable that the rib members 24 are arranged at 30° intervals when viewed from the longitudinal direction of the first new pipe 30. The multiple rib members 24 are formed in a conical shape on the outer peripheral surface of the first new piping 30. The outer diameter of the conical portion formed in a conical shape becomes smaller as it moves in the direction (second direction X2) of insertion into the existing piping 10. In other words, the conical portion is inclined so as to approach the first new piping 30 as it moves in the second direction X2.

[0026] In the piping system 100 according to this embodiment, the outer diameter of the conical portion formed by the plurality of rib members 24 becomes smaller in the direction in which the first new pipe 30 and the first insertion sleeve pipe 20 are inserted into the existing pipe 10. The plurality of rib members 24 function as guide members when the first new pipe 30 and the first insertion sleeve pipe 20 are pulled into the existing pipe 10. This allows the first insertion sleeve pipe 20 to be inserted smoothly into the existing pipe 10. The multiple rib members 24 also function to smoothly transmit the force with which the first new piping 30 is pulled to the first insertion sleeve pipe 20. In addition, when the first new piping 30 is pushed in the second direction X2 relative to the existing piping 10, the multiple rib members 24 also function to smoothly transmit the force pushing the first new piping 30 to the first insertion sleeve pipe 20.

[0027] Incidentally, with the first new pipe 30 inserted into the first insertion sleeve pipe 20, instead of pulling one of the first new pipe 30 or the first insertion sleeve pipe 20 in the second direction X2 relative to the existing pipe 10, or in addition to pulling one of the first new pipe 30 or the first insertion sleeve pipe 20 in the second direction X2 relative to the existing pipe 10, the first new pipe 30 and the first insertion sleeve pipe 20 may be inserted into the existing pipe 10 by pushing one of the first new pipe 30 or the first insertion sleeve pipe 20 in the second direction X2 relative to the existing pipe 10. Alternatively, with the first new pipe 30 inserted into the first insertion sleeve pipe 20, both the first new pipe 30 and the first insertion sleeve pipe 20 may be pushed in the second direction X2 relative to the existing pipe 10. In this case, the piping system 100 includes a pushing member 40. The pushing member 40 pushes in the first new pipe 30. The first new pipe 30 is inserted into the existing pipe 10 together with the first insertion sleeve tube 20 by being pushed into the pushing member 40. The pushing member 40 may have any mechanism for pushing the first new pipe 30 into the existing pipe 10. For example, as shown in FIG. 2 , the pushing member 40 is a drive mechanism including a first clamp 41 that grips the outer circumferential surface of the first new pipe 30 and a jack 42 that connects the first clamp 41 to a second clamp 43 that grips the outer circumferential surface of the existing pipe 10. The jack 42 connected to the first clamp 41 provided at the end of the existing pipe 10 in the first direction X1 pushes the first new pipe 30 together with the first insertion sleeve tube 20 into the existing pipe 10 in the second direction X2. As another example of the pushing member 40, for example, the pushing member 40 may be disposed inside the first insertion sleeve tube 20, that is, a mechanism in which the pushing member 40 grips the first insertion sleeve tube 20 from the inside may be used. The first new piping 30 is pushed into the pushing member 40 disposed inside the first insertion sleeve tube 20, whereby the first new piping 30 is inserted into the existing piping 10 together with the first insertion sleeve tube 20.

[0028] The piping system 100 according to this embodiment includes a pushing member 40 that pushes the first new pipe 30 into the existing pipe 10. This configuration allows the first new pipe 30 and the first insertion sleeve tube 20 to be smoothly inserted into the existing pipe 10. While both the pulling member 32 and the pushing member 40 are provided in this embodiment, only one of the pulling member 32 and the pushing member 40 may be provided, or both the pulling member 32 and the pushing member 40 may be omitted. When both the pulling member 32 and the pushing member 40 are omitted, the first new pipe 30 and the first insertion sleeve tube 20 may be inserted into the existing pipe 10 by a pushing mechanism installed on land L.

[0029] The pushing member 40 may push the first insertion sleeve pipe 20 together with the first new pipe 30 into the existing pipe 10. In this case, the pushing member 40 may have a mechanism for pushing the first insertion sleeve pipe 20 into the existing pipe 10. For example, a first clamp 41 grips the outer peripheral surface of the first insertion sleeve pipe 20. The pushing member 40 is a drive mechanism including a jack 42 that connects the first clamp 41 to a second clamp 43 that grips the outer peripheral surface of the existing pipe 10. The jack 42 connected to the first clamp 41 provided at the end of the existing pipe 10 in the first direction X1 pushes the first insertion sleeve pipe 20 together with the first new pipe 30 into the existing pipe 10 in the second direction X2. Furthermore, in the case where the pushing member 40 has a mechanism for gripping the first new pipe 30 from the inside, the first insertion sleeve pipe 20 is pushed in by the pushing member 40 arranged inside the first new pipe 30.

[0030] The piping system 100 according to this embodiment includes a pushing member 40 that pushes the first insertion sheath pipe 20 into the existing piping 10. With this configuration, the first insertion sheath pipe 20 and the first new piping 30 can be smoothly inserted into the existing piping 10.

[0031] There may be a plurality of irregularities (first irregularities) 21 on the inner peripheral surface of the existing pipe 10, and a plurality of irregularities (second irregularities) 31 on the outer peripheral surface of the first new pipe 30. The first irregularities 21 are caused, for example, by protruding obstacles on the inner peripheral surface of the existing pipe 10 or by a plurality of backing metals. The second irregularities 31 are, for example, spacers 4 provided at predetermined intervals in the longitudinal direction of the first new pipe 30.

[0032] The piping system 100 according to this embodiment includes a first insertion sleeve pipe 20 into which a first new pipe 30 is inserted. If the piping system 100 does not include the first insertion sleeve pipe 20, when the first new pipe 30 is inserted into the existing pipe 10, the plurality of second asperities 31 come into contact with the inner peripheral surface of the existing pipe 10, and the plurality of first asperities (backing metal) 21 come into contact with the outer peripheral surface of the first new pipe 30 or the second asperities 31. By inserting the first insertion sleeve pipe 20 into which the first new pipe 30 is inserted into the existing pipe 10, frictional resistance between the existing pipe 10 and the first new pipe 30 caused by the plurality of first asperities 21 and the plurality of second asperities 31 can be reduced. This configuration allows the first new pipe 30 to be smoothly inserted into the existing pipe 10.

[0033] Second Embodiment In the first embodiment, the piping system 100 is illustrated as including one first insertion sheath pipe 20 as the insertion sheath pipe and one first new pipe 30 as the new pipe, but the number of insertion sheath pipes and the number of new pipes are not limited to one. A plurality of insertion sheath pipes and a plurality of new pipes may be provided. For example, in the second embodiment, as shown in Fig. 3, the piping system 200 includes two insertion sheath pipes (a first insertion sheath pipe 20 and a second insertion sheath pipe 20A) and two new pipes (a first new pipe 30 and a second new pipe 30A). Note that the number of insertion sheath pipes and new pipes is not limited to two. A piping system 200 according to a second embodiment will be described with reference to Fig. 3. The same components as those in the first embodiment are denoted by the same reference numerals, and their description will be omitted, with differences being mainly described.

[0034] Fig. 3 is a schematic diagram for explaining the piping system 200 according to this embodiment. Fig. 3 is a partial vertical cross-sectional view showing a part of the piping system 200 according to this embodiment. Fig. 3 shows cross sections of the existing piping 10, the first insertion sheath pipe 20, and the second insertion sheath pipe 20A. The piping system 200 includes a first insertion sheath pipe 20, a first new piping 30, a second insertion sheath pipe 20A, and a second new piping 30A.

[0035] The second insertion sheath pipe 20A is inserted into the existing piping 10. The second insertion sheath pipe 20A has the same configuration as the first insertion sheath pipe 20. That is, the outer diameter of the second insertion sheath pipe 20A is smaller than the inner diameter of the existing piping 10. The second insertion sheath pipe 20A is a pipe having an outer diameter that allows it to be inserted into the existing piping 10. The cross section of the second insertion sheath pipe 20A is, for example, a circular, long pipe. The cross section of the second insertion sheath pipe 20A is not limited to a circular shape, as long as it has a space inside that allows the second new piping 30A, which will be described later, to be inserted into. The material of the second insertion sheath pipe 20A is, for example, carbon steel. The length of the second insertion sheath pipe 20A is, for example, 12 m to 120 m. The outer diameter of the second insertion sheath pipe 20A is, for example, 400 A.

[0036] The second new pipe 30A is inserted into the second insertion sleeve pipe 20A. The second new pipe 30A has the same configuration as the first new pipe 30. That is, the outer diameter of the second new pipe 30A is smaller than the inner diameter of the second insertion sleeve pipe 20A. The second new pipe 30A is a pipe with an outer diameter that can be inserted into the second insertion sleeve pipe 20A. The cross section of the second new pipe 30A is, for example, a circular, long pipe. The cross section of the second new pipe 30A is not limited to being circular. A fluid such as gas or oil flows inside the second new pipe 30A. The material of the second new pipe 30A is, for example, carbon steel. The length of the second new pipe 30A is, for example, 12 m to 120 m. The outer diameter of the second new pipe 30A is, for example, 300 A.

[0037] The first insertion sheath pipe 20 is located in front of the second insertion sheath pipe 20A. The first insertion sheath pipe 20 and the second insertion sheath pipe 20A are connected. The first new pipe 30 is located in front of the second new pipe 30A. The first new pipe 30 and the second new pipe 30A are connected. A method for connecting these pipes will be described later.

[0038] The pushing member 40 pushes in the second new pipe 30A. The second new pipe 30A is inserted into the existing pipe 10 together with the second insertion sleeve tube 20A by being pushed into the pushing member 40. The pushing member 40 may have a mechanism for pushing the second new pipe 30A into the existing pipe 10. For example, the pushing member 40 may be configured to grip the outer peripheral surface of the existing pipe 10 and push the second new pipe 30A together with the second insertion sleeve tube 20A into the existing pipe 10 in the second direction X2. Also, the pushing member 40 may have a mechanism for gripping the second insertion sheath pipe 20A from the inside. The second new piping 30A is inserted into the existing piping 10 together with the second insertion sheath pipe 20A by being pushed into the pushing member 40 arranged inside the second insertion sheath pipe 20A. Furthermore, in the case where the pushing member 40 has a mechanism for gripping the second new pipe 30A from the inside, the second insertion sleeve pipe 20A is pushed in by the pushing member 40 arranged inside the second new pipe 30A. The first insertion sheath pipe 20 and the first new pipe 30 may be joined to the second insertion sheath pipe 20A and the second new pipe 30A in a state where they are inserted into the existing pipe 10, respectively.

[0039] (Piping system installation method) An installation method S200 for a piping system 200 according to the second embodiment will be described with reference to Fig. 3 to Fig. 5. Fig. 4A and Fig. 4B are partial cross-sectional views for explaining the installation method S200 for a piping system 200. In Fig. 4A and Fig. 4B, the first insertion sheath tube 20 and the second insertion sheath tube 20A are shown in cross section. Fig. 5 is a flowchart showing the installation method for the piping system 200.

[0040] In the construction method S200 of the piping system 200, the piping system 200 includes a first insertion sheath pipe 20, a first new pipe 30, a second insertion sheath pipe 20A, and a second new pipe 30A. The construction method S200 of the piping system 200 includes a new pipe welding step S1 and an insertion sheath pipe welding step S2. The new pipe welding step S1 is a step of connecting the first new pipe 30 and the second new pipe 30A. Fig. 4A shows the state before the first new pipe 30 and the second new pipe 30A are connected. Fig. 4B shows the state after the first new pipe 30 and the second new pipe 30A are connected. 4A and 4B , before the new pipe welding step S1, the first new pipe 30 is placed in the first insertion sheath pipe 20, and the second new pipe 30A is placed in the second insertion sheath pipe 20A. At this time, a first end 37 of a first protruding portion 36 of the first new pipe 30 protrudes from the first insertion sheath pipe 20 in a first direction (first direction X1) that is the opposite direction to the direction (second direction X2) in which the first new pipe 30 and the first insertion sheath pipe 20 are inserted into the existing pipe 10. A second end 37A of a second protruding portion 36A of the second new pipe 30A protrudes from the second insertion sheath pipe 20A in the second direction X2 that is the direction in which the second new pipe 30A and the second insertion sheath pipe 20A are inserted into the existing pipe 10. The new-pipe welding step S1 is a step of welding the first end 37 of the first protruding portion 36 to the second end 37A of the second protruding portion 36A. In this way, in the new-pipe welding step S1, the first end 37 of the first protruding portion 36 at the rear of the first insertion sheath pipe 20 is welded to the second end 37A of the second protruding portion 36A at the front of the second insertion sheath pipe 20A. Note that a known welding method can be used for the welding. In this way, the first new pipe 30 and the second new pipe 30A are connected to form a long new pipe. For example, if the lengths of the first new pipe 30 and the second new pipe 30A are both 12 m, the first new pipe 30 and the second new pipe 30A are connected in the new pipe welding step S1 to form a long new pipe of 24 m.

[0041] The insertion sheath pipe welding step S2 is a step of connecting the first insertion sheath pipe 20 and the second insertion sheath pipe 20A. In the insertion sheath pipe welding step S2, the first half pipe 38a and the second half pipe 38b, which respectively cover the first end 37 of the first protruding portion 36 and the second end 37A of the second protruding portion 36A, are welded to the third end 25 in the first direction X1 of the first insertion sheath pipe 20 and the fourth end 25A in the second direction X2 of the second insertion sheath pipe 20A. The first and second half pipes 38a, 38b cover a portion of the outer peripheral surface of the first protruding portion 36 and a portion of the outer peripheral surface of the second protruding portion 36A. For example, in a plan view of the first new piping 30 and the second new piping 30A (e.g., as viewed from the arrow in FIG. 4A ), the first and second half pipes 38a, 38b are arranged above and below the first and second protruding portions 36, 36A. The first and second half pipes 38a, 38b are arranged opposite each other so as to cover the first and second protruding portions 36, 36A. The first half pipe 38a and the second half pipe 38b are welded to the third end 25 in the first direction X1 of the first insertion sheath pipe 20 and the fourth end 25A in the second direction X2 of the second insertion sheath pipe 20A. Note that a known welding method can be used for the welding. In this way, the first insertion sheath pipe 20 and the second insertion sheath pipe 20A are connected to form an elongated insertion sheath pipe. For example, if the lengths of the first insertion sheath pipe 20 and the second insertion sheath pipe 20A are both 12 m, the first insertion sheath pipe 20 and the second insertion sheath pipe 20A become an elongated insertion sheath pipe of 24 m in the insertion sheath pipe welding step S2.

[0042] In this way, the first new pipe 30 and the second new pipe 30A are connected in the new pipe welding step S1, and the first insertion sheath pipe 20 and the second insertion sheath pipe 20A are connected in the insertion sheath pipe welding step S2. The procedure of the construction method S200 is as follows: after performing the new pipe welding step S1, the insertion sheath pipe welding step S2 is performed. After the new pipe welding step S1 and the insertion sheath pipe welding step S2, the welded insertion sheath pipes (first insertion sheath pipe 20, second insertion sheath pipe 20A) and the welded new pipes (first new pipe 30, second new pipe 30A) are inserted into the existing pipe 10 (existing pipe insertion step).

[0043] The construction method S200 for the piping system 200 according to this embodiment includes a new pipe welding step S1 and an insertion sheath pipe welding step S2. This configuration ensures that the new pipes (first new pipe 30 and second new pipe 30A) and the insertion sheath pipes (first insertion sheath pipe 20 and second insertion sheath pipe 20A) can be elongated. Furthermore, because the welded insertion sheath pipes (20, 20A) and the welded new pipes (30, 30A) are inserted into the existing pipe 10, the risk of damage to the anticorrosive coating on the outer surface of the new pipes (30, 30A) during insertion can be reduced. If the insertion sheath pipes (20, 20A) are not used, the new pipes (30, 30A) move within the existing pipe 10. Therefore, if the new pipes (30, 30A) move, for example, 500 to 5,000 meters, the risk of damage due to unexpected wear or detachment of the spacer 4 increases. When using the insertion sheath pipe (20, 20A), the movement distance of the new pipe (30, 30A) is limited to, for example, the length (e.g., 12 m to 60 m) of the new pipe (30, 30A) and the insertion sheath pipe (20, 20A), thereby reducing the risk of damage due to wear or detachment of the spacer 4.

[0044] (Variations in the installation method of the piping system) The construction method S100 for the piping system 100 according to the first embodiment will be described with reference to Fig. 6. Fig. 6 is a flowchart showing a modified example of the construction method S100 for the piping system 100.

[0045] In the construction method S100 of the piping system 100, the piping system 100 includes a first insertion sheath pipe 20, a first new pipe 30, a second insertion sheath pipe 20A, and a second new pipe 30A. The installation method S100 of the piping system 100 includes a first insertion step S3 and a second insertion step S4. Before the first insertion step S3 and the second insertion step S4, the first insertion sheath pipe 20, which is elongated by joining multiple pipe members (insertion sheath pipes), and the first new pipe 30, which is elongated by joining multiple pipe members (new pipes), are prepared (lengthening step S5). That is, in this case, the first insertion sheath pipe 20 and the first new pipe 30 may each be a single long pipe formed by joining axially adjacent ends of multiple pipe members. For example, when two 12-m insertion sheath pipes are joined, the first insertion sheath pipe 20 is elongated to 24 m. For example, when two 12-m new pipes are joined, the first new pipe 30 is elongated to 24 m. In this case, any joining method (e.g., welding) can be used to join the ends of the multiple pipe members. The ends of the multiple pipe members may be joined by directly butting them against each other. Alternatively, the ends of multiple tubular members may be centered and welded together. The first insertion step S3 is a step of inserting the first new piping 30 into the first insertion sheath pipe 20. In the first insertion step S3, the first new piping 30 is inserted into the first insertion sheath pipe 20 by pulling or pushing the first insertion sheath pipe 20 relative to the first insertion sheath pipe 20.

[0046] In the second insertion step S4, after the first insertion step S3, the first insertion sleeve pipe 20 with the first new piping 30 inserted therein is inserted into the existing piping 10. In the second insertion step S4, the first insertion sleeve pipe 20 with the first new piping 30 inserted therein is inserted into the existing piping 10 by pulling or pushing it relative to the existing piping 10.

[0047] In the construction method S100 of the piping system 100, a first new pipe 30, which has been elongated by joining a plurality of new pipes, is inserted into a first insertion sheath pipe 20, which has been elongated by joining a plurality of insertion sheath pipes. With this configuration, the first new pipe 30 and the first insertion sheath pipe 20 can be more reliably elongated.

[0048] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure.

[0049] For example, the plumbing system 100 may be used for water supply applications. The inner peripheral surface of the existing pipe 10 and the outer peripheral surface of the first new pipe 30 do not need to have any irregularities. The first new piping 30 does not have to protrude from the first insertion sleeve pipe 20. In this case, a pull-in member 32 may be provided at the end of the first insertion sleeve pipe 20 in the longitudinal direction in the direction in which the first new piping 30 is inserted into the first insertion sleeve pipe 20 (the second direction X2). The pulling member 32, the pushing member 40, the plug member 22 and the rib member 24 may be omitted.

[0050] Furthermore, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0051] (Addendum) The embodiment can be understood, for example, as follows.

[0052] <1> A piping system according to one aspect of the present disclosure includes a first insertion sleeve pipe to be inserted into an existing piping, a first new piping inserted into the first insertion sleeve pipe and through which a fluid flows, The present invention is characterized by comprising:

[0053] By inserting the first insertion sleeve pipe with the first new pipe inserted into the existing pipe, it is possible to reduce frictional resistance between the existing pipe and the first new pipe caused by the multiple spacers and multiple unevenness. With this configuration, it is possible to smoothly insert the first new pipe into the existing pipe.

[0054] <2> the above <1> The piping system according to the above aspect may employ a configuration including a pulling member for pulling the first new pipe together with the first insertion sleeve pipe into the existing pipe.

[0055] The first new pipe can be smoothly inserted into the existing pipe by using the pulling member for pulling the first new pipe and the first insertion sheath pipe into the existing pipe.

[0056] <3> the above <2> The piping system according to the present invention may employ a configuration in which a plug member is provided at the end of the first insertion sheath tube, which is the end on the side in the direction in which the first insertion sheath tube is inserted into the existing piping.

[0057] The plug member makes it possible to easily fill the second space between the outer circumferential surface of the first new pipe and the inner circumferential surface of the first insertion sleeve pipe with a gas such as air during insertion. The buoyancy of the filled gas reduces the force applied from the first insertion sleeve pipe to the bottom surface of the existing pipe in the direction of gravity, thereby reducing frictional resistance between the existing pipe and the first insertion sleeve pipe. This allows the first insertion sleeve pipe to be inserted smoothly into the existing pipe.

[0058] <4> the above <3> The piping system according to the present invention may adopt a configuration in which the first new piping protrudes from the first insertion sheath tube, and the plug member is inserted into the portion of the first new piping that protrudes from the first insertion sheath tube.

[0059] Because the first new pipe, whose outer diameter is smaller than the inner diameter of the first insertion sheath pipe, protrudes from the first insertion sheath pipe, the first new pipe and the first insertion sheath pipe can be easily pulled and inserted into the existing pipe. Furthermore, because a plug member is used even when the first new pipe protrudes from the first insertion sheath pipe in this way, it becomes possible to easily fill the second space between the outer peripheral surface of the first new pipe and the inner peripheral surface of the first insertion sheath pipe with a gas such as air during insertion. This allows the first insertion sheath pipe to be smoothly inserted into the existing pipe.

[0060] <5> the above <4> The piping system according to the present invention may include a plurality of rib members connected to the plug member and the portion of the first new piping that protrudes from the first insertion sheath tube, and the outer diameter of the conical portion formed by the plurality of rib members may become smaller as it goes in the direction of insertion into the existing piping.

[0061] The multiple rib members function as guide members when the first new pipe and the first insertion sleeve pipe are pulled into the existing pipe. This allows the first insertion sleeve pipe to be smoothly inserted into the existing pipe. The multiple rib members also function to smoothly transmit the force pulling the first new pipe to the first insertion sleeve pipe. Furthermore, when the first new pipe is pushed in the second direction relative to the existing pipe, the multiple rib members also function to smoothly transmit the force pushing the first new pipe to the first insertion sleeve pipe.

[0062] <6> the above <1> The piping system according to the present invention may employ a configuration in which a plug member is provided at the end of the first insertion sheath tube, which is the end on the side in the direction in which the first insertion sheath tube is inserted into the existing piping.

[0063] The plug member makes it possible to easily fill the second space between the outer circumferential surface of the first new pipe and the inner circumferential surface of the first insertion sleeve pipe with a gas such as air during insertion. The buoyancy of the filled gas reduces the force applied from the first insertion sleeve pipe to the bottom surface of the existing pipe in the direction of gravity, thereby reducing frictional resistance between the existing pipe and the first insertion sleeve pipe. This allows the first insertion sleeve pipe to be inserted smoothly into the existing pipe.

[0064] <7> the above <6> The piping system according to the present invention may include a pushing member that pushes the first new piping into the existing piping, and the first new piping is inserted into the existing piping together with the first insertion sheath tube by being pushed into the pushing member.

[0065] The pushing member that pushes the first new pipe into the existing pipe allows the first new pipe and the first insertion sleeve pipe to be smoothly inserted into the existing pipe.

[0066] <8> the above <7> The piping system according to the above aspect may employ a configuration in which the pushing member pushes the first insertion sleeve pipe into the existing piping together with the first new piping.

[0067] The pushing member that pushes the first insertion sleeve pipe into the existing pipe allows the first insertion sleeve pipe and the first new pipe to be smoothly inserted into the existing pipe.

[0068] <9> the above <1> ~ <8> The piping system according to any one of the above aspects may employ a configuration in which the inner peripheral surface of the existing piping has a plurality of irregularities, and the outer peripheral surface of the first new piping has a plurality of irregularities.

[0069] By inserting the first insertion sleeve pipe with the first new pipe inserted into the existing pipe, it is possible to reduce frictional resistance between the existing pipe and the first new pipe caused by multiple irregularities. With this configuration, it is possible to smoothly insert the first new pipe into the existing pipe.

[0070] <10> the above <1> ~ <8> In one aspect of the construction method for a piping system, the piping system includes a second insertion sleeve pipe to be inserted into the existing piping, and a second new piping inserted into the second insertion sleeve pipe and having a fluid flowing therethrough, and the first new piping includes a first end of a first protruding portion protruding from the first insertion sleeve pipe in a first direction opposite to a direction in which the first new piping and the first insertion sleeve pipe are inserted into the existing piping, and the second new piping includes a first end of a first protruding portion protruding from the first insertion sleeve pipe in a first direction opposite to a direction in which the first new piping and the first insertion sleeve pipe are inserted into the existing piping. The method is characterized by comprising: a new-installation piping welding step of welding a second end of a second protruding portion protruding from the second insertion sheath pipe toward a second direction, which is a direction in which the second insertion sheath pipe is inserted into the existing piping; and an insertion sheath pipe welding step of welding a first half pipe and a second half pipe, which cover the first end of the first protruding portion and the second end of the second protruding portion, respectively, to a third end of the first insertion sheath pipe in the first direction and a fourth end of the second insertion sheath pipe in the second direction.

[0071] By performing the new pipe welding step S1 and the insertion sheath pipe welding step S2, the new pipe and the insertion sheath pipe can be reliably elongated.

[0072] <11> the above <10> The construction method of the piping system according to the present invention may employ a configuration including a first insertion step of inserting the first new piping into the first insertion sheath pipe, and a second insertion step of inserting the first insertion sheath pipe with the first new piping inserted into the existing piping after the first insertion step.

[0073] By configuring the first new pipe, which has been lengthened by joining multiple new pipes, to be inserted inside the first insertion sheath pipe, which has been lengthened by joining multiple insertion sheath pipes, the first new pipe 30 and the first insertion sheath pipe 20 can be lengthened more reliably. [Explanation of symbols]

[0074] 10 Existing piping 20 First insertion sheath tube 20A Second insertion sheath tube 21 First unevenness (backing plate) 22 Plug member 24 Rib member 25 Third end 25A 4th end 30 First new piping 30A Second new piping 31 2nd unevenness 32 Retractable member 36 1st protruding part 36A 2nd protruding part 37 First end 37A 2nd end 38a 1st half tube 38b Second half pipe 40 Push-in member 100,200 Piping System G Undersea R1 First space R2 2nd space S1 New pipe welding step S2 Insertion sheath welding step S3 First insertion step S4 Second insertion step S5 Lengthening Step S100, S100 construction method

Claims

1. a first insertion sheath pipe to be inserted into the existing piping; a first new pipe that is inserted into the first insertion sleeve pipe and through which a fluid flows; a pulling member for pulling the first new pipe together with the first insertion sleeve pipe into the existing pipe, the pulling member being pulled from a side in a direction in which the first insertion sleeve pipe is inserted into the existing pipe; Equipped with the pull-in member is provided at an end of the first insertion sleeve pipe, the end being on a side in a direction in which the first insertion sleeve pipe is inserted into the existing piping, a plug member is provided at an end of the first insertion sleeve pipe, the end being on a side in a direction in which the first insertion sleeve pipe is inserted into the existing piping; the first new pipe protrudes from the first insertion sleeve pipe, The plug member is inserted through a portion of the first new pipe that protrudes from the first insertion sheath pipe. A piping system comprising:

2. The piping system according to claim 1 , wherein the retraction member is retracted by a cord-like body.

3. The piping system according to claim 1 , wherein the pull-in member and the first new piping are integral with each other.

4. The piping system of claim 1 , wherein the retraction member is retracted by a winch.

5. a plurality of rib members connected to the plug member and a portion of the first new pipe protruding from the first insertion sleeve pipe; The outer diameter of the conical portion formed by the plurality of rib members becomes smaller toward the direction of insertion into the existing pipe. The piping system according to claim 1 .

6. a pushing member that pushes the first new pipe into the existing pipe; The first new pipe is inserted into the existing pipe together with the first insertion sleeve pipe by being pushed into the pushing member. The piping system according to claim 1 .

7. The piping system according to claim 6, wherein the pushing member pushes the first insertion sleeve pipe into the existing piping together with the first new piping.

8. The inner circumferential surface of the existing pipe has a plurality of irregularities, The outer peripheral surface of the first newly installed pipe has a plurality of irregularities. A piping system according to any one of claims 1 to 7.

9. A method for installing a piping system, comprising: The piping system includes: a first insertion sheath pipe to be inserted into the existing piping; a first new pipe that is inserted into the first insertion sleeve pipe and through which a fluid flows; a second insertion sleeve pipe to be inserted into the existing piping; a second new pipe that is inserted into the second insertion sleeve pipe and through which a fluid flows, a new installation pipe welding step of welding a first end of a first protruding portion of the first new pipe that protrudes from the first insertion sheath pipe toward a first direction that is a direction opposite to a direction in which the first new pipe and the first insertion sheath pipe are inserted into the existing pipe, and a second end of a second protruding portion of the second new pipe that protrudes from the second insertion sheath pipe toward a second direction that is a direction in which the second new pipe and the second insertion sheath pipe are inserted into the existing pipe; an insertion sheath pipe welding step of welding a first half pipe and a second half pipe, which cover the first end of the first protruding portion and the second end of the second protruding portion, respectively, to a third end of the first insertion sheath pipe in the first direction and a fourth end of the second insertion sheath pipe in the second direction.

10. a first insertion step of inserting the first new piping into the first insertion sleeve pipe; a second insertion step of inserting the first insertion sheath pipe, into which the first new pipe has been inserted, into the existing pipe after the first insertion step; The method for constructing a piping system according to claim 9, further comprising:

Images