Pipe joining construction jig and pipe joining construction method

Abstract

The present invention provides a pipe joining jig and pipe joining method that enable efficient joining of multiple pipes in a continuous manner and allow for laser leveling of the pipes to be joined. [Solution] The pipe joining construction jig 1 comprises a tubular central part 11 having a through hole 47 extending in the axial direction, four locking parts 13 arranged radially with respect to the central part 11, a link mechanism 12 connecting the four locking parts 13 and the central part 11, and an operating part 14 positioned on the central part 11 for operating the link mechanism 12. By operating the operating part 14 and activating the link mechanism 12, each of the four locking parts 13 moves radially with respect to the central part 11.

Description

Technical Field

[0001] The present invention relates to a pipe joining construction jig and a pipe joining construction method.

Background Art

[0002] As a construction method for joining a plurality of pipes underground, for example, a pipe joining construction method in which a series of steps of sheet pile, excavation, joining, and backfilling are performed is known. In this pipe joining construction method, pipes are installed in the excavated sheet pile construction section, and after the pipes are joined, the sheet pile construction section is further extended, and pipes are sequentially installed in the extended sheet pile construction section to continuously join a plurality of pipes (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the pipe joining construction method of Patent Document 1, for example, since a series of steps of sheet pile, excavation, joining, and backfilling are performed, depending on the construction setup, it is necessary to fasten the pipes before backfilling. Therefore, in this pipe joining construction method, a jig for joining the pipes inside the pipe becomes an obstacle and the construction becomes difficult. Also, when joining the pipes, in order to arrange the pipes straight, it is necessary to adjust the height while suspending the pipes with a crane or the like. Furthermore, a jig for joining is hooked and fixed to the pipe ends of the pipes to be joined, but if a biased force acts on the pipes during joining, the jig may come off from the pipe ends. Therefore, it is difficult to efficiently perform the joining construction of a plurality of pipes.

[0005] In addition, for example, when joining gravity-flowing sewer or rainwater pipes using the open-cut method, it is essential to level the pipes to be joined using a laser. Therefore, ingenuity is required to pass the laser through the pipes to be joined.

[0006] The present invention has been made in view of the circumstances described above, and aims to provide a pipe joining jig and a pipe joining method that enable efficient joining of multiple pipes in a continuous manner and allow for laser leveling of the pipes to be joined. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention proposes the following means. A pipe joining construction jig according to one aspect of the present invention comprises a tubular central portion having a through hole extending in the axial direction, a plurality of locking portions arranged radially with respect to the central portion, a link mechanism connecting the locking portions and the central portion, and an operating portion located in the central portion for operating the link mechanism, wherein the link mechanism is activated by operating the operating portion, causing each of the plurality of locking portions to move radially with respect to the central portion. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a pipe joining jig and pipe joining method that enable efficient joining of multiple pipes in a continuous manner and allow for laser leveling of the pipes to be joined. [Brief explanation of the drawing]

[0009] [Figure 1] This is a side view showing an example of implementing a pipe joining construction method using a pipe joining construction jig according to an embodiment of the present invention. [Figure 2] Figure 1 is a side view showing the pipe joining construction jig. [Figure 3] Figure 1 is a front view showing the pipe joining construction jig. [Figure 4] This is a cross-sectional view showing the operating section of a pipe joining construction jig according to an embodiment. [Figure 5]This is a front view showing an example of implementing a pipe joining construction method using a pipe joining construction jig according to the embodiment. [Modes for carrying out the invention]

[0010] The following describes a pipe joining construction jig and pipe joining construction method according to one embodiment of the present invention, with reference to the drawings.

[0011] <Pipe joining construction jig> As shown in Figure 1, the pipe joining construction jig 1 is used for pipe joining construction to continuously join multiple pipes P. As an example of a pipe joining construction method using the pipe joining construction jig 1, a method in which the processes of sheet pile laying, excavation, joining, and backfilling are carried out in a series will be described. In this pipe joining construction method, the ground is excavated and pipes P are laid at the bottom of the excavated ground. After laying pipes P at the bottom, the excavation of the ground is extended. Pipes P are laid at the bottom of the extended excavation. By repeating this process sequentially, multiple pipes P are continuously joined underground. Here, the multiple pipes P laid continuously at the bottom of the excavated ground are joined by the pipe joining construction jig 1 (see Figure 1).

[0012] It is preferable that the multiple pipes P be made of fiber-reinforced plastic (FRP) pipes with a nominal diameter (bore diameter) of 500 to 2000 mm and a pipe length of 6 m or less. Furthermore, in the case of a nominal diameter of 2200 mm to 2600 mm, it is even more preferable that fiber-reinforced plastic (FRP) pipes with a pipe length of 4 m or less be used. However, the material of the pipes P is not limited to this. The pipe length of the multiple pipes P is preferably 2 to 4 m. In soft ground, pipes with a pipe length of 2 m are used as multiple pipes P. The multiple pipes P joined underground are used, for example, as sewer pipes or rainwater drainage pipes.

[0013] The pipe joining jig 1 is used, for example, in conjunction with a locking plate 4, wire 6, and lever hoist 8 when joining a subsequent pipe P to a previously laid pipe P. Hereinafter, the previously laid pipe P may be referred to as "preceding pipe P1," and the subsequent pipe P as "subsequent pipe P2." The pipe joining jig 1 is made of, for example, steel, but may also be made of a material such as FRP (for example, synthetic resin). By making the pipe joining jig 1 out of a synthetic resin such as FRP, the weight of the pipe joining jig 1 can be reduced.

[0014] The pipe joining jig 1 comprises a central section 11, a link mechanism 12, a plurality of locking sections 13, an operating section 14, a pair of pulling sections 15, and a moving section 16. Hereinafter, the axial direction of the central section 11 may be referred to as the "axial direction," and the circumferential direction relative to the axial direction of the central section 11 may be referred to as the "circumferential direction." Furthermore, the side of the pipe joining jig 1 facing the subsequent pipe P2 will be referred to as the "front," and the side opposite the subsequent pipe P2 will be referred to as the "rear."

[0015] <Central part> As shown in Figures 2 and 3, the central portion 11 is formed in a tubular shape extending in the axial direction. The central portion 11 has a first through hole 11a. The first through hole 11a extends in the axial direction. The central portion 11 is positioned in the center of the preceding pipe P1, for example, when the pipe joining construction jig 1 is fixed inside the preceding pipe P1.

[0016] <Link mechanism> The link mechanism 12 comprises a plurality of first arms 21 and a plurality of second arms 22. In this embodiment, four first arms 21 and four second arms 22 are used as an example. However, the number of first arms 21 and two second arms 22 is not limited to four; any number of three or more can be arbitrarily selected.

[0017] The four first arms 21 are provided at each first connecting part 24 at the front end part of the central part 11. The four first connecting parts 24 are provided at the front end part of the central part 11 at regular intervals in the circumferential direction. The base end parts of the four first arms 21 are rotatably connected to the four first connecting parts 24 via connecting pins 25. The four first arms 21 are radially arranged from the front end part of the central part 11 via the four first connecting parts 24.

[0018] The four second arms 22 are provided at each second connecting part 27 at the rear end part of the central part 11. The four second connecting parts 27 are provided at the rear end part of the central part 11 at regular intervals in the circumferential direction. The base end parts of the four second arms 22 are rotatably connected to the four second connecting parts 27 via connecting pins 28. The four second arms 22 are radially arranged from the front end part of the central part 11 via the four second connecting parts 27. That is, the link mechanism 12 is radially arranged with respect to the central part 11.

[0019] <Locking part> The front end parts of the four locking parts 13 are rotatably connected to the front end parts of the four first arms 21 via connecting pins 31. The rear end parts of the four locking parts 13 are rotatably connected to the front end parts of the four second arms 22 via connecting pins 32. That is, the link mechanism 12 connects the four locking parts 13 to the central part 11.

[0020] The four locking parts 13 are arranged radially and parallel to the central part 11 by the link mechanism 12. Also, the four first arms 21 and the four second arms 22 are arranged in parallel. That is, the central part 11, the first arms 21, the second arms 22, and the locking parts 13 form a so-called parallel link. The outer circumference 13a of the four locking parts 13 is formed in an arc shape so as to be able to contact the inner circumference of the preceding pipe P1, for example. The link mechanism 12 and the four locking parts 13 are operated by the operation part 14.

[0021] Here, the length of the first arm 21 of the link mechanism 12 can be adjusted by selecting the hole 35 into which the pin 34 is inserted. Similarly, the length of the second arm 22 can be adjusted by selecting the hole 38 into which the pin 37 is inserted. Therefore, the lengths of the first arm 21 and the second arm 22 of the link mechanism 12 can be adjusted to match the diameter of the pipe P to which the pipe joining construction jig 1 is applied.

[0022] <Operation section> As shown in Figures 2 to 4, the operating section 14 is located in the central section 11. The operating section 14 includes, for example, a movable rod 41, a plurality (four in the embodiment) of operating links 42, a hydraulic cylinder 43, a hydraulic power source 44, and an operating lever 45. The movable rod 41 is fitted into the first through hole 11a of the central section 11 and is arranged to be movable in the axial direction. The front end of the movable rod 41 protrudes forward from the front end 11b of the central section 11. The movable rod 41 is formed in a tubular shape that extends in the axial direction. The movable rod 41 has a second through hole 41a that extends in the axial direction. The second through hole 41a penetrates from one end (front end) to the other end (rear end) of the movable rod 41. The diameter of the second through hole 41a is set to, for example, 100 mm or more and 300 mm or less. However, in practice, it is used at about 100 mm by utilizing a constant pipe gradient.

[0023] Here, a through hole 47 is provided by the first through hole 11a in the central part 11 and the second through hole 41a in the movable rod 41. Therefore, the through holes 47 in the central part 11 and the movable rod 41 are set to have a diameter of, for example, 100 mm or more and 300 mm or less. Hereinafter, the through holes 47 in the central part 11 and the movable rod 41 may be referred to as "the through hole 47 of the central part 11". The reason for setting the through hole 47 of the central part 11 to have a diameter of 100 mm or more and 300 mm or less will be explained in detail later.

[0024] As shown in Figures 2 and 3, four actuation links 42 are provided at each third connecting portion 51 at the front end of the movable rod 41. The four third connecting portions 51 are provided at a constant interval in the circumferential direction at the front end of the movable rod 41. The base ends of the four actuation links 42 are rotatably connected to the four third connecting portions 51 via connecting pins 52. The four actuation links 42 are arranged radially from the front end of the movable rod 41 via the four third connecting portions 51. The tips of the four actuation links 42 are rotatably connected to the four first arms 21 via connecting pins 53.

[0025] As shown in Figures 2 and 4, the hydraulic cylinder 43, hydraulic power source 44, and operating lever 45 are located on the front end 11b side of the central section 11. The hydraulic cylinder 43 is located circumferentially between the link mechanism 12 and the locking portion 13, and along the lower part of the central section 11. A rod 56 protrudes from the tip of the cylinder portion 55 of the hydraulic cylinder 43 toward the rear end 11c side of the central section 11. The tip of the rod 56 is connected to the rear end of the movable rod by a connecting bracket 58.

[0026] The hydraulic power source 44 is positioned circumferentially between the link mechanism 12 and the locking portion 13, and along the upper part of the central portion 11. The hydraulic power source 44 is connected to the head end 55a of the cylinder portion 55 via the oil passage 61. The operating lever 45 is located above the hydraulic power source 44 and extends along the hydraulic power source 44. That is, the operating lever 45 is positioned between the radially arranged link mechanism 12 and locking portion 13 in the circumferential direction and is located above the central portion 11. The base end 45a of the operating lever 45 is rotatably connected to the hydraulic power source 44. A grip 62 is provided at the tip of the operating lever 45. The grip 62 protrudes forward, for example, from the front end 11b of the central portion 11. The grip 62 is the part that the operator holds with their hand when operating the operating section 14.

[0027] As shown in Figures 2 and 3, according to the operating unit 14, for example, the operating lever 45 is operated vertically by gripping the grip 62 with the hand. As a result, oil is supplied from the hydraulic supply source 44 to the cylinder portion 55 of the hydraulic cylinder 43 via the oil passage 61. By supplying oil to the cylinder portion 55, the rod 56 of the hydraulic cylinder 43 moves backward. As a result, the moving rod 41 moves backward. As the moving rod 41 moves backward, the four operating links 42 move so as to expand radially outward. As a result, the four first arms 21 move so as to expand radially outward.

[0028] Here, the central section 11, the first arm 21, the second arm 22, and the locking section 13 are formed as a parallel link. Therefore, following the movement of the four first arms 21, the four second arms 22 move so as to expand radially outward. As a result, the four locking sections 13 move so as to expand radially outward.

[0029] Furthermore, the switching unit 63 of the hydraulic power source 44 is switched, and the operating lever 45 is operated. Oil is returned from the cylinder part 55 of the hydraulic cylinder 43 to the hydraulic power source 44. As a result, the rod 56 of the hydraulic cylinder 43 moves forward. As the moving rod 41 moves forward, the four operating links 42 move so as to contract inward in the radial direction. As a result, the four first arms 21 move so as to contract inward in the radial direction. Following the movement of the four first arms 21, the four second arms 22 move so as to contract inward in the radial direction. This causes the four locking parts 13 to move so as to contract inward in the radial direction. In other words, the link mechanism 12 is activated by operating the operating lever 45 of the operating unit 14. As a result, each of the four locking parts 13 moves radially relative to the central part 11.

[0030] <Traction part> A pair of towing sections 15 are provided in the central section 11, closer to the four first connecting sections 24. The pair of towing sections 15 are arranged in a downward slope in the circumferential direction, from between the four locking sections 13 toward both sides. Each pair of towing sections 15 is reinforced with a rib (not shown). The rib (not shown) extends inclined from the tip of the towing section 15 to the rear end 11c of the central section 11. A towing plate 65 is provided at the tip of each pair of towing sections 15. A hook (not shown) of the wire 6 (see Figure 1) is connected to the towing plate 65.

[0031] A pair of towing plates 65 have a pair of towing sections 15 provided in the central section 11. Preferably, the height of the locking plate 4 is set to match the height of the pair of towing plates 65.

[0032] <Mobile section> The mobile unit 16 comprises a pair of first legs 71, a pair of first wheels 72, a pair of second legs 73, and a pair of second wheels 74. The pair of first legs 71 are provided on the pair of first connecting parts 24 located on the lower side of the four first connecting parts 24. The pair of first legs 71 are arranged in an inverted V shape. The first wheels 72 are provided at the tips of the pair of first legs 71. The pair of second legs 73 are provided on the lower pair of second connecting parts 27 among the four second connecting parts 27. The pair of second legs 73 are arranged in an inverted V shape. Second wheels 74 are provided at the tips of the pair of second legs 73.

[0033] As shown in Figures 1 and 3, the pair of first wheels 72 and the pair of second wheels 74 are in contact with the inner circumference of the preceding pipe P1. Therefore, the pipe joining jig 1 can be supported by the movable part 16 when the diameter is reduced radially inward so that the four locking parts 13 move away from the inner circumference of the preceding pipe P1. In this state, the movable part 16 (i.e., the pair of first wheels 72 and the pair of second wheels 74) can move the pipe joining jig 1 axially inside the preceding pipe P1 to a desired position. Alternatively, the pair of first wheels 72 and the pair of second wheels 74 can be used to load and unload the pipe joining jig 1 into and out of the preceding pipe P1.

[0034] Here, the length of the first leg 71 of the movable part 16 can be adjusted by selecting the hole 77 into which the pin 76 is inserted. Similarly, the length of the second leg 73 can be adjusted by selecting the hole 79 into which the pin 78 is inserted. Therefore, the lengths of the first leg 71 and the second leg 73 of the movable part 16 can be adjusted to match the diameter of the pipe P to which the pipe joining construction jig 1 is applied.

[0035] <Pipe joint construction method> Next, a pipe joining construction method for joining multiple pipes P in a continuous manner using a pipe joining construction jig 1 will be explained based on Figures 1 to 3 and 5. The pipe joining construction method includes a first step, a second step, and a third step.

[0036] First, as shown in Figures 1 to 3, in the first step, after positioning the lead pipe P1, the pipe joining construction jig 1 is moved into the lead pipe P1 using the moving part 16. Next, the grip 62 of the operating part 14 is grasped by hand and the operating lever 45 is operated up and down. The four locking parts 13 move so as to expand radially outward. The four locking parts 13 lock in place by contacting the inner surface of the lead pipe P1. In this state, the four first arms 21 and the four second arms 22 exert a tensioning force on the inner surface of the lead pipe P1. The reaction force of this tensioning force mechanically fixes the pipe joining construction jig 1 to the inner surface of the lead pipe P1.

[0037] Next, as shown in Figures 1 and 5, in the second step, the subsequent pipe P2 is positioned in conjunction with the preceding pipe P1. A locking plate 4 is locked to the receiving opening P2a of the subsequent pipe P2. The locking plate 4 is connected to a pair of towing plates 65 with wires 6. In this state, a lever hoist 8 attached to the wires 6 is operated. By operating the lever hoist 8, the subsequent pipe P2 is pulled towards the preceding pipe P1 by the pair of wires 6 as indicated by the arrows. The insertion opening P2b of the pulled-in subsequent pipe P2 is inserted into the receiving opening P1a of the preceding pipe P1. As a result, the subsequent pipe P2 is joined to the preceding pipe P1 using the pipe joining construction jig 1.

[0038] In this pulling operation, where the subsequent pipe P2 is pulled towards the preceding pipe P1 by each wire 6, a force acts to rotate the four first arms 21 and the four second arms 22 radially outward. As a result, the tensioning force exerted by the four first arms 21 and the four second arms 22 becomes even stronger. This further increases the contact strength of the four locking parts 13 with respect to the inner surface of the preceding pipe P1, i.e., the fixing strength of the pipe joining construction jig 1.

[0039] Next, as shown in Figure 1, in the third step, for example, a gauge 80 is placed on the subsequent pipe P2 which is joined to the preceding pipe P1. A laser 82 is irradiated from behind or inside the preceding pipe P1 by the laser oscillator 81. The irradiated laser 82 reaches the gauge 80 through the through hole 47 in the central part 11. The laser 82 that reaches the gauge 80 performs a leveling operation on the subsequent pipe P2. In this embodiment, an example is described in which the gauge 80 is placed directly on the subsequent pipe P2, but in other examples, the gauge 80 may be placed on the locking plate 4.

[0040] After the leveling work for the subsequent pipe P2 is completed, for example, the second and third steps are repeated in sequence. Thus, the subsequent pipe P2 can be sequentially joined to the preceding pipe P1. This allows multiple pipes P to be joined in a continuous manner using the pipe joining construction jig 1.

[0041] Here, the reason for setting the through-hole 47 in the central part 11 to a diameter of 100 mm or more and 300 mm or less will be explained based on Figure 1 and Table 1.

[0042] [Table 1]

[0043] As shown in Table 1, known diameters for multiple pipes P joined in a continuous manner include, for example, 1000, 1500, 1800, and 2400. A pipe P with a diameter of 1000 can be considered when joined in a continuous manner over a 50m length with a gradient of 1.5%, or when joined in a continuous manner over a 50m length with a gradient of 5%, from the viewpoint of the flow velocity and flow rate inside the pipe P. The flow velocity and flow rate inside the pipe P can generally be determined using Manning's formula.

[0044] When the gradient of pipe P is 1.5%, the vertical movement distance of the continuously joined pipes P is 75 mm (50 m × 1.5%). In this case, it is necessary to send the laser 82 emitted from the laser oscillator 81 through the through hole 47 in the central part 11 to the gauge 80 of the pipe P joined to the tip. To satisfy this condition, the through hole 47 in the central part 11 was made to have a diameter of 100 mm. Furthermore, if the gradient of pipe P is 5%, the vertical movement distance of the continuously joined pipes P is 250 mm (50 m x 5%). In this case as well, it is necessary to send the laser 82 emitted from the laser oscillator 81 through the through hole 47 in the central part 11 to the gauge 80 of the pipe P joined to the tip. To satisfy this condition, the through hole 47 in the central part 11 was made with a diameter of 300 mm.

[0045] Furthermore, the 1500mm diameter pipe P can be joined in a continuous manner over a length of 50m with a gradient of 1.5%, or in a continuous manner over a length of 50m or 80m with a gradient of 3.2%. In this case, in order to allow the laser 82 to reach the gauge 80 through the through-hole 47 in the central part 11, the through-hole 47 in the central part 11 was made to have diameters of 100mm, 200mm, and 300mm.

[0046] Furthermore, the 1800mm diameter pipe P may be joined continuously over a length of 50m with a 1.5% gradient, or continuously over a length of 100m or 70m with a 2.6% gradient. In this case, in order to allow the laser 82 to reach the gauge 80 through the through-hole 47 in the central part 11, the through-hole 47 in the central part 11 was made with a diameter of 150mm and 200mm.

[0047] Furthermore, the 2400mm diameter pipe P can be used in various ways, such as when it is joined continuously over a 50m length with a 1% gradient, or when it is joined continuously over a 100m or 70m length with a 1.7% gradient. In these cases, the through-holes 47 in the central section 11 are made to have diameters of 100mm and 200mm in order to allow the laser 82 to reach the gauge 80. From the above perspective, the through-hole 47 in the central part 11 was set to a diameter of 100 mm or more and 300 mm or less. In practical terms, the through-hole 47 in the central part 11 may have a diameter of 100 mm. For example, in each example described in Table 1, the diameter is set in the range of 100 mm to 300 mm depending on the vertical movement distance, but it may also have a diameter of 100 mm regardless of the vertical movement distance.

[0048] As shown in Figures 1 and 2, the pipe joining construction jig 1 according to the embodiment described above has the operating lever 45 of the operating part 14 that operates the link mechanism 12 positioned in the central part 11. Therefore, when the pipe joining construction jig 1 is placed inside the preceding pipe P1, the operating lever 45 can be positioned in the center of the preceding pipe P1. In other words, space can be secured inside the preceding pipe P1 to operate the operating lever 45. As a result, by operating the operating lever 45, each of the four locking parts 13 can be moved radially outward and locked to the inner surface of the preceding pipe P1.

[0049] Furthermore, by moving each of the four locking parts 13 radially outward and locking each locking part 13 to the inner surface of the preceding pipe P1, the pipe joining construction jig 1 can be fixed to the inner surface of the preceding pipe P1, for example. Therefore, the successor pipe P2 can be continuously joined to the preceding pipe P1 using the pipe joining construction jig 1. This allows for efficient joining of multiple pipes P in a continuous manner.

[0050] Furthermore, a through-hole 47 is provided in the central part 11 of the pipe joining construction jig 1. Therefore, a laser 82 can be passed through the through-hole 47. This allows leveling work to be performed on the subsequent pipe P2 that is joined to the preceding pipe P1 using the laser 82 passed through the through-hole 47. Thus, leveling work can be performed on the pipe P being joined using the laser 82.

[0051] Here, there is a conventional pipe joining jig that is used by locking it onto the end of the preceding pipe P1. In the case of this pipe joining jig, for example, after joining the first pipe to the preceding pipe P1, the pipe joining jig is locked onto the end of the first pipe and the second subsequent pipe P2 is joined. Therefore, it is necessary to secure space between the preceding pipe P1 and the first subsequent pipe P2 to lock the pipe joining jig onto the end of the first pipe. Due to the space that needs to be secured in this way, it is conceivable that the scouring ability will be hindered in multiple consecutive pipes P.

[0052] Therefore, the four locking parts 13 of the pipe joining construction jig 1 are configured to be able to lock onto the inner surface of the preceding pipe P1. Thus, it is not necessary to lock the pipe joining construction jig 1 to the pipe end. This eliminates the need for space to lock the pipe joining construction jig 1 to the pipe end between multiple consecutive pipes P. Consequently, obstruction of scouring caused by space can be suppressed in multiple consecutive pipes P.

[0053] Furthermore, if the height of the locking plate 4 is set to match the height of the pair of towing plates 65, the subsequent pipe P2 can be pulled straight towards and joined to the preceding pipe P1. Furthermore, as shown in Figures 2 to 4, the operating lever 45 of the operating section 14 is positioned between the four locking parts 13 and located above the central part 11. This allows the operating lever 45 to be positioned in an easily accessible location inside the preceding pipe P1. Furthermore, the grip 62 of the operating lever 45 is made to protrude forward from the front end 11b of the central part 11. Therefore, the grip 62 can be positioned in front of the four first connecting parts 24. This allows the operating lever 45 to be positioned in a more easily operable location.

[0054] In addition, the through-hole 47 in the central section 11 was made to have a diameter of 100 mm or more and 300 mm or less. Therefore, the laser 82 passing through the through-hole 47 can be guided to multiple pipes P to be joined. This allows leveling work to be performed on multiple pipes P to be joined using the laser 82.

[0055] According to the pipe joining construction method of the embodiment described above, as shown in Figures 1 and 3, in the first step, the four locking parts 13 of the pipe joining construction jig 1 are locked to the inner surface of the preceding pipe P1. Thus, the pipe joining construction jig 1 can be fixed to the inner surface of the preceding pipe P1. Next, in the second step, the subsequent pipe P2 is joined to the preceding pipe P1 using the pipe joining construction jig 1. Thus, the subsequent pipe P2 can be continuously joined to the preceding pipe P1 using the pipe joining construction jig 1 fixed to the inner surface of the preceding pipe P1. This makes it possible to efficiently join multiple pipes P in a continuous manner.

[0056] Furthermore, in the third step, a laser 82 is passed through the through-hole 47 of the pipe joining construction jig 1 to perform leveling work on the subsequent pipe P2. This allows leveling work to be performed on multiple pipes P to be joined using the laser 82.

[0057] Furthermore, in the first step, the four locking parts 13 of the pipe joining construction jig 1 were locked to the inner surface of the preceding pipe P1. Therefore, it is not necessary to lock the pipe joining construction jig 1 to the pipe end. This eliminates the need for space to lock the pipe joining construction jig 1 to the pipe end between multiple consecutive pipes P. Consequently, obstruction of scouring caused by space can be suppressed in multiple consecutive pipes P.

[0058] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0059] The diameter of the through hole 47 may be less than 100 mm or more than 300 mm. The operating section 14 does not necessarily have to be located above the central section 11, nor does it have to be located between the locking sections 13. The locking portion 13 does not necessarily have to be four in the circumferential direction; for example, there may be three, or there may be five or more. The link mechanism 12 is not limited to the structure described above.

[0060] Furthermore, it is possible to replace the components in this embodiment with well-known components as appropriate, without departing from the spirit of the present invention.

[0061] (Note) The above embodiment can be understood, for example, as follows:

[0062] <1> A pipe joining construction jig according to one aspect of the present invention comprises a tubular central portion having a through hole extending in the axial direction, a plurality of locking portions arranged radially with respect to the central portion, a link mechanism connecting the locking portions and the central portion, and an operating portion located in the central portion for operating the link mechanism, wherein the link mechanism is activated by operating the operating portion, causing each of the plurality of locking portions to move radially with respect to the central portion.

[0063] In this pipe joining jig, the operating part that activates the link mechanism is located in the center. Therefore, when this pipe joining jig is placed inside a pipe, the operating part can be positioned in the center of the pipe. In other words, space can be secured inside the pipe to operate the operating part. As a result, by operating the operating part, each of the multiple locking parts can be moved radially outward and locked to the pipe.

[0064] Furthermore, by moving each of the multiple locking parts radially outward and locking each locking part to the inner surface of the pipe as described above, the pipe joining construction jig can be fixed to the inner surface of a previously laid pipe, for example. Therefore, using this pipe joining construction jig, subsequent pipes can be joined in a continuous manner to previously laid pipes. This allows for efficient joining of multiple pipes in a continuous manner. Hereafter, the previously laid pipe may be referred to as the preceding pipe.

[0065] Furthermore, a through-hole was provided in the center of the pipe joining jig. Therefore, a laser can be passed through this through-hole. This allows for leveling work on the subsequent pipe joined to the preceding pipe using the laser passed through the through-hole. Thus, leveling work can be performed on the pipes being joined using a laser.

[0066] In this context, there is a conventional pipe joining jig that is used by locking it onto the end of a preceding pipe. With this type of jig, for example, after joining the first pipe to the preceding pipe, the jig is locked onto the end of the first pipe, and then the second pipe is joined to the second pipe. Therefore, it is necessary to secure space between the preceding pipe and the first pipe to lock the jig onto the end of the first pipe. As a result, it is conceivable that the flow scouring ability may be hindered by this space in a series of consecutive pipes. Therefore, the locking portion of the pipe joining jig was designed to be able to lock onto the inner surface of the pipe. As a result, there is no need to lock the pipe joining jig to the pipe end. This eliminates the need for space to lock the pipe joining jig to the pipe end between multiple consecutive pipes. Consequently, obstruction of scouring caused by space can be suppressed in multiple consecutive pipes.

[0067] <2> the above <1> In the pipe joining construction jig relating to this, the operating part may be positioned between the radially arranged locking parts and provided on the upper side of the central part.

[0068] In the pipe joining construction jig, the operating part is positioned between the locking parts and located on the upper side of the central section. This allows the operating part to be placed in an easily accessible position inside the pipe.

[0069] <3> the above <1> or <2> In the pipe joining construction jig relating to this, the through hole may have a diameter of 100 mm or more and 300 mm or less.

[0070] According to the pipe joining construction jig, by making the through-hole diameter between 100 mm and 300 mm, a laser can be guided through the through-hole to multiple pipes being joined. This allows for laser leveling work to be performed on multiple pipes being joined.

[0071] <4> A pipe joining construction method according to one aspect of the present invention is described above. <1> A pipe joining construction method for joining multiple pipes in a continuous manner using the pipe joining construction jig described above, comprising: a first step of moving the locking portion of the pipe joining construction jig radially outward to lock it to the inner surface of a pre-laid pipe; a second step of arranging a subsequent pipe in a continuous manner with the pre-laid pipe and joining the subsequent pipe using the pipe joining construction jig; and a third step of passing a laser through the through-hole of the pipe joining construction jig and performing leveling work on the joined pipes.

[0072] According to the pipe joining construction method, in the first step, the locking part of the pipe joining construction jig is locked to the inner surface of the preceding pipe. Thus, the pipe joining construction jig can be fixed to the inner surface of the preceding pipe. Next, in the second step, the subsequent pipe is joined to the preceding pipe using the pipe joining construction jig. Thus, the subsequent pipe can be continuously joined to the preceding pipe using the pipe joining construction jig fixed to the inner surface. This allows for efficient joining of multiple pipes in a continuous manner.

[0073] Furthermore, in the third step, a laser is passed through the through-hole of the pipe joining jig to level the subsequent pipes. This allows for laser leveling of multiple pipes to be joined.

[0074] Furthermore, in the first step, the locking portion of the pipe joining jig was locked to the inner surface of the preceding pipe. Therefore, it is not necessary to lock the pipe joining jig to the pipe end. This eliminates the need for space to lock the pipe joining jig to the pipe end between multiple consecutive pipes. Consequently, obstruction of scouring caused by space in multiple consecutive pipes can be suppressed. [Explanation of Symbols]

[0075] 1... Pipe joining construction jig 11...Central part 12…Link mechanism 13… Locking part 14...Operation unit 45...Operating lever 47…Through hole 82… Laser P...Multiple tubes P1...Preceding pipe P2... Subsequent tube

Claims

1. A tubular central part having a through hole extending in the axial direction, Multiple locking parts arranged radially from the central part, A link mechanism connecting the locking portion and the central portion, It comprises an operating unit located in the central part for operating the link mechanism, A pipe joining construction jig, wherein operating the operating part activates the link mechanism, causing each of the multiple locking parts to move radially relative to the central part.

2. The aforementioned operating unit is The pipe joining construction jig according to claim 1, which is positioned between the radially arranged locking portions and provided on the upper side of the central portion.

3. The pipe joining construction jig according to claim 1 or claim 2, wherein the through hole has a diameter of 100 mm or more and 300 mm or less.

4. A pipe joining construction method for joining multiple pipes in a continuous manner using the pipe joining construction jig described in claim 1, In the first step, the locking portion of the pipe joining construction jig is moved radially outward to lock it to the inner surface of the pre-installed pipe, A second step involves arranging a subsequent pipe in continuity with the preceding pipe and joining the subsequent pipe using the pipe joining construction jig, A pipe joining construction method, comprising a third step of passing a laser through a through-hole in the pipe joining construction jig and performing leveling work on the joined pipes.

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