Pipeline construction method

Abstract

To provide a construction method of a pipeline capable of reducing the number of joints between ductile cast iron pipes when constructing the pipeline by connecting the ductile cast iron pipes.SOLUTION: The pipeline construction method includes a step S1 in which a temporary rail 22 is provided at a pipeline installation position P on an installation frame 10 and a temporary stage 30 having the temporary rail 22 on its upper surface is provided, a step S2 in which a ductile iron pipe 3 is lifted and temporarily placed on the temporary stage 30, a step S3 in which the ductile iron pipe 3 on the temporary stage 30 is horizontally moved along the temporary rail 22 to the pipeline installation position P on the installation frame 10, and a step S2 in which the step S3 and the step S4 are repeatedly performed to move a plurality of ductile iron pipes 3 onto the installation frame 10 and then connect the plurality of ductile iron pipes 3 to each other to construct a pipeline 2.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a pipeline construction method for constructing a pipeline by connecting a plurality of ductile cast iron pipes on an installation frame. [Background technology]

[0002] BACKGROUND ART Conventionally, a method for constructing a pipeline by connecting a plurality of pipes has been known (see Patent Document 1). Patent Document 1 proposes a piping construction method in which a single pipe is carried into a first work space connected to a piping pit, this single pipe is moved horizontally toward the piping pit using a first frame, the next single pipe is then carried into the first work space, this next single pipe is connected to the single pipe that has already been moved horizontally, and these connected single pipes are moved horizontally using the first frame, and this process is repeated to lay a completed pipe in a piping pit.

[0003] Patent Document 2 proposes a pipeline laying method that includes the steps of installing rail members along the ceiling surface of a shield tunnel, installing a suspended carriage that can move along the rail members, and transporting equipment using the suspended carriage and laying a pipeline below the rail members using the transported equipment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-219075 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-178859 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a pipeline construction method that can reduce the number of joints between ductile cast iron pipes when constructing a pipeline by connecting ductile cast iron pipes. [Means for solving the problem]

[0006] The pipeline construction method of the first invention is a pipeline construction method for constructing a pipeline (for example, a pipeline 2 described later) by connecting a plurality of ductile cast iron pipes (for example, a ductile cast iron pipe 3 described later) on an installation frame (for example, an installation frame 10 described later), and includes a first step (for example, a temporary rail 22 described later) of providing a pipeline installation position (for example, a pipeline installation position P described later) on the installation frame, and erecting a temporary stage (for example, a temporary stage 30 described later) on the top surface of which a temporary rail (for example, a temporary rail 22 described later) continuous with the temporary rail is provided. The method is characterized by including: a first step (step S1) of lifting the ductile cast iron pipe and temporarily placing it on the temporary stage (for example, step S2 described below); a second step (for example, step S2 described below) of horizontally moving the ductile cast iron pipe on the temporary stage along the temporary rail (horizontal pulling) and arranging it at a pipeline installation position on the installation frame (for example, step S3 described below); and a fourth step (for example, step S4 described below) of repeatedly performing steps S2 and S3 to move the multiple ductile cast iron pipes onto the installation frame, and then connecting the multiple ductile cast iron pipes to construct a pipeline.

[0007] According to this invention, a ductile cast iron pipe of a predetermined length is temporarily placed on a temporary stage, and then the ductile cast iron pipe is pulled horizontally along temporary rails and moved to the pipeline installation position on the installation frame. By repeating this operation, multiple ductile cast iron pipes are moved to the pipeline installation position, and then the multiple moved ductile cast iron pipes are connected to each other to construct the pipeline. Although ductile cast iron pipes are difficult to transport manually, the pipeline can be easily constructed by lifting the pipes onto a temporary stage using a lifting device and then moving them onto the installation platform using temporary rails.In addition, because the pipeline was constructed by horizontally moving ductile cast iron pipes of a predetermined length that would be difficult to transport manually, the number of joints between the ductile cast iron pipes can be reduced.

[0008] The pipeline construction method of the second invention is characterized in that the installation frame comprises a temporary rail provided at the pipeline installation position, a pair of vertical members (e.g., intermediate columns 14 described below) arranged on both sides of the pipeline installation position, and a horizontal member (e.g., upper beam 13 described below) connecting the pair of vertical members above the pipeline installation position.

[0009] According to this invention, a horizontal member is provided above the pipeline installation position on the installation frame, and even if the ductile cast iron pipe cannot be installed by dropping it in, the pipeline can be easily constructed by pulling the ductile cast iron pipe horizontally from above the temporary stage.

[0010] The pipeline construction method of the third invention is characterized in that, in the third step, a conveying device (e.g., conveying device 32 described below) is used that includes a traveling device (e.g., traveling device 40 described below) that travels on the temporary rails, a portal frame (e.g., portal frame 50 described below), and a lifting device (e.g., lever block 60 described below) that is provided on the portal frame and can lift the ductile cast iron pipe, and the conveying device lifts the ductile cast iron pipe at the temporary stage, and in this state, the conveying device runs on the temporary rails to move to the installation frame, and then the ductile cast iron pipe is lowered from the conveying device at the installation frame.

[0011] According to this invention, the transport device holding the ductile cast iron pipe can be moved horizontally on temporary rails, so that the ductile cast iron pipe can be placed on the installation frame without dropping it from above the installation frame, thereby making it easy to build a pipeline on the installation frame. [Effects of the Invention]

[0012] According to the present invention, a pipeline construction method can be provided that can reduce the number of joints between ductile cast iron pipes when constructing a pipeline by connecting ductile cast iron pipes. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a longitudinal cross-section of a pipeline structure constructed by a pipeline construction method according to an embodiment of the present invention. [Figure 2] 2 is a cross-sectional view of the pipeline structure according to the embodiment of the present invention; FIG. [Figure 3] 10 is a flowchart of a procedure for constructing a pipeline according to the embodiment. [Figure 4] FIG. 1 is an explanatory diagram of a pipeline construction procedure according to the embodiment (part 1, after the temporary stage is erected). [Figure 5] FIG. 10 is an explanatory diagram of the pipeline construction procedure according to the embodiment (part 2, a state in which a ductile cast iron pipe is temporarily placed on a temporary stage). [Figure 6] FIG. 6 is a cross-sectional view of the temporary stage of FIG. 5 . [Figure 7] FIG. 7 is a view of the temporary stage of FIG. 6 taken along the arrow CC. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention is a method for constructing a pipeline by connecting multiple ductile cast iron pipes on an installation frame. Specifically, first, the ductile cast iron pipes are lifted and temporarily placed on a temporary stage. Next, the ductile cast iron pipes on the temporary stage are moved horizontally (pulled horizontally) along temporary rails and placed at the pipeline installation position on the installation frame. By repeating these steps, multiple ductile cast iron pipes are moved onto the installation frame, and then the multiple ductile cast iron pipes are connected to each other to construct the pipeline. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of a pipeline structure 1 constructed by a pipeline construction method according to one embodiment of the present invention, and Fig. 2 is a sectional view of the pipeline structure 1 of Fig. 1 taken along the line AA. The pipeline structure 1 comprises an installation frame 10 and a pipeline 2 constructed at a predetermined position on the installation frame 10.

[0015] As shown in Figure 1, the installation frame 10 comprises pillars 11 arranged at predetermined intervals, lower beams 12 extending approximately horizontally from the pillars 11, upper beams 13 as horizontal members extending approximately horizontally from the pillars 11 and positioned above the lower beams 12, intermediate pillars 14 as a pair of vertical members connecting the lower beams 12 and the upper beams 13 and extending approximately vertically, intermediate beams 15 connecting the intermediate pillars 14 to each other and extending approximately horizontally, connecting beams 16 connecting adjacent lower beams 12 to each other, connecting beams 17 connecting adjacent intermediate pillars 14 to each other, and connecting beams 18 connecting adjacent upper beams 13 to each other. Above the intermediate beam 15 is a pipeline installation position P. At this pipeline installation position P, a support frame 20 having a recess 21 formed in the center is provided, and the pipeline 2 is fitted into the recess 21 of this support frame 20. The pipeline 2 is constructed by connecting a plurality of ductile cast iron pipes 3 of a predetermined length.

[0016] The procedure for constructing the pipeline 2 will be described below with reference to the flowchart of FIG. In step S1, as shown in Fig. 4, a pair of temporary rails 22 is provided at the pipeline installation position of the installation frame 10. Specifically, the pair of temporary rails 22 are arranged on both ends of the support frame 20 with the recess 21 sandwiched between them. 4, a temporary stage 30 is erected adjacent to the installation frame 10. On the temporary stage 30, the above-mentioned support frame 20 and a pair of temporary rails 22 are provided.

[0017] 5, in step S2, a wire 31 is attached to the ductile cast iron pipe 3, which is then lifted by a crane or the like (not shown), and temporarily placed on the recess 21 of the support frame 20 on the temporary stage 30. Thereafter, the wire 31 is removed. In step S3, as shown in Figure 5, the conveying device 32 lifts the ductile cast iron pipe 3 on the support frame 20 and moves it horizontally (horizontally) on the temporary rail 22 to place it at the pipeline installation position P on the installation frame 10.

[0018] Fig. 6 is a cross-sectional view of the temporary stage 30 taken along line BB in Fig. 5. Fig. 7 is a view of the temporary stage 30 taken along line CC in Fig. 6. As shown in Figures 6 and 7, the conveying device 32 comprises a pair of running devices 40 that run on the temporary rails 22, a gate-shaped frame 50 provided on the pair of running devices 40, and a lever block (registered trademark) 60 attached to the gate-shaped frame 50 as a lifting device that can lift the ductile cast iron pipe 3. Each traveling device 40 includes a pair of wheels 41 that can travel on the temporary rails 22, and a traveling device body 42 that supports the pair of wheels 41 so that they can rotate. The portal frame 50 includes a pair of support posts 51 extending upward from the pair of traveling devices 40, and an upwardly bulging, bow-shaped connecting portion 52 connecting the pair of support posts 51. A pair of hanging pieces 53 are provided on both ends of the connecting portion 52.

[0019] The lever block 60 includes a lever block body 61, a base end hook 62 provided on the lever block body 61, a chain 63 wound around the lever block body 61, a tip end hook 64 provided at the tip of the chain 63, and a lever 65 provided on the lever block body 61 for winding or unwinding the chain 63. The base end hook 62 of the lever block 60 is engaged with one of a pair of hanging pieces 53, and the tip end hook 64 is engaged with the other of the pair of hanging pieces 53. The chain 63 of the lever block 60 is disposed on the underside of the ductile cast iron pipe 3.

[0020] In this conveying device 32, the ductile cast iron pipe 3 can be lifted by operating the lever 65 of the lever block 60 to wind up the chain 63, and the ductile cast iron pipe 3 can be lowered by unwinding the chain 63. Therefore, when the ductile cast iron pipe 3 on the temporary stage 30 is transported to the installation frame 10 by the transport device 32, the following procedure is followed. First, the chain 63 is passed under the ductile cast iron pipe 3 on the support frame 20, and the tip hook 64 is engaged with the hanging piece 53. In this state, the lever 65 is operated to wind up the chain 63, thereby lifting the ductile cast iron pipe 3. In this state, the transport device 32 is made to travel on the temporary rail 22, and the ductile cast iron pipe 3 is moved to the installation frame 10. After that, the lever 65 is operated to wind up the chain 63, thereby lowering the ductile cast iron pipe 3 onto the support frame 20. Then, the tip hook 64 is removed from the hanging piece 53, and the chain 63 is removed from under the ductile cast iron pipe 3.

[0021] In step S4, steps S2 and S3 are repeated to move a plurality of ductile cast iron pipes 3 onto the installation frame 10, and then the plurality of ductile cast iron pipes 3 are connected to each other to construct the pipeline 2.

[0022] According to this embodiment, the following effects are obtained. (1) Although the ductile cast iron pipe 3 is difficult to transport manually, the pipeline 2 can be easily constructed by lifting the ductile cast iron pipe 3 onto the temporary stage 30 using a lifting device and then moving it onto the installation frame 10 using temporary rails 22. In addition, since the pipeline 2 is constructed by horizontally moving the ductile cast iron pipe 3 of a predetermined length, which would be difficult to transport manually, the number of joints between the ductile cast iron pipes 3 can be reduced.

[0023] (2) An upper beam 13 is provided above the pipeline installation position P of the installation frame 10, so that even if the ductile cast iron pipe 3 cannot be installed by dropping it in, the pipeline 2 can be easily constructed by pulling the ductile cast iron pipe 3 horizontally from above the temporary stage 30. (3) By horizontally moving the transport device 32 holding the ductile cast iron pipe 3 on the temporary rails 22, the ductile cast iron pipe 3 can be placed on the installation frame 10 without dropping the ductile cast iron pipe 3 from above the installation frame 10. This allows the pipeline 2 to be easily constructed on the installation frame 10.

[0024] The present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention. [Explanation of symbols]

[0025] 1...Pipeline structure 2...Pipeline 3...Ductile iron pipe 10...Installation frame 11...Column 12...Lower beam 13...Upper beam (horizontal member) 14...Intermediate column (vertical member) 15...Intermediate beam 16...Connecting beam 17…Connection beam 18…Connection beam 20... Support stand 21... Recess 22... Temporary rail 30...Temporary stage 31...Wire 32...Transport device 40...Traveling device 41...Wheel 42...Traveling device body 50...Gantry frame 51...Support 52...Connecting part 53...Hanging piece 60... Lever block (lifting device) 61... Lever block body 62...Base end hook 63...Chain 64...Tip end hook 65...Lever

Claims

1. A pipeline construction method for constructing a pipeline by connecting a plurality of ductile cast iron pipes on an installation frame, comprising: a first step of installing a temporary rail at a pipeline installation position of the installation frame and erecting a temporary stage having a temporary rail continuous with the temporary rail on its upper surface; A second step of lifting the ductile cast iron pipe and temporarily placing it on the temporary stage; a third step of horizontally moving the ductile cast iron pipe on the temporary stage along the temporary rails to place it at a pipeline installation position on the installation frame; a fourth step of repeatedly performing the second step and the third step to move the plurality of ductile cast iron pipes onto the installation frame, and then connecting the plurality of ductile cast iron pipes to each other to construct a pipeline.

2. The pipeline construction method described in claim 1, characterized in that the installation frame comprises a temporary rail installed at the pipeline installation position, a pair of vertical members arranged on both sides of the pipeline installation position, and a horizontal member connecting the pair of vertical members above the pipeline installation position.

3. A transport device including a traveling device that travels on the temporary rail, a portal frame provided on the traveling device, and a lifting device provided on the portal frame that can lift the ductile cast iron pipe, A pipeline construction method as described in claim 1 or 2, characterized in that in the third step, the ductile cast iron pipe is lifted by the conveying device at the temporary stage, and in this state, the conveying device is run on the temporary rail to move to the installation frame, and then the ductile cast iron pipe is lowered from the conveying device at the installation frame.

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