Water lifting device and construction method using water lifting device

Abstract

To provide a water lifting device and a construction method using the water lifting device that can improve workability while maintaining the performance of a lifting pipe.SOLUTION: A water lifting device for pumping up water 1 from a well (deep well W) comprises a pump (submerged pump 10) disposed in the well, and a flexible pipe (pipe body 21) connected to the pump and configured to guide water discharged from the pump to the outside of the well.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pumping device used in a well and a construction method using the pumping device. [Background technology]

[0002] Conventionally, the technology of a pumping device used for a well has been publicly known, as described in Patent Document 1, for example.

[0003] Patent Document 1 discloses a water pumping device (pump device) for pumping water from a deep well. This water pumping device includes a ground unit placed on the ground, a submersible pump placed in the deep well, and a pumping pipe that guides water from the submersible pump to the ground unit.

[0004] Generally, when constructing a pumping system such as that described in Patent Document 1, a straight pumping pipe having a certain length (for example, 4 m) is inserted into a deep well, and the next pumping pipe is connected to its upper end. By repeating this process of inserting and connecting pumping pipes, a pumping pipe of the desired length is placed in the deep well.

[0005] However, in the above-mentioned pumping device, in order to insert and connect the straight lifting pipe into the deep well, a relatively large tower must be installed above the deep well to support the lifting pipe, a relatively large working space is required around the deep well, and transporting the straight lifting pipe is complicated, so there is room for improvement in the ease of installation of the pumping device. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-11731 Summary of the Invention [Problem to be solved by the invention]

[0007] One aspect of the present disclosure has been made in consideration of the above-described circumstances, and the problem to be solved is to provide a pumping device and a construction method using the pumping device that can improve construction efficiency. [Means for solving the problem]

[0008] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0009] A pumping device according to one aspect of the present disclosure is a pumping device for pumping water from a well, comprising a pump that is placed in the well for pumping water, and flexible piping that is connected to the pump and guides the water pumped out of the well.

[0010] Furthermore, the pipe according to one aspect of the present disclosure is formed from a synthetic resin.

[0011] In addition, a pumping device according to one aspect of the present disclosure further includes a joint portion connected to the piping for guiding the water guided by the piping to an above-ground unit, and the piping is formed seamlessly from the pump to the joint portion.

[0012] Furthermore, the pipe according to one aspect of the present disclosure is formed in an elongated shape.

[0013] Moreover, the pumping device according to one aspect of the present disclosure further includes a rope connected to the pump and receiving the load of the pump.

[0014] In addition, in one aspect of the present disclosure, the mid-section of the rope is fixed to the mid-section of the piping.

[0015] Moreover, according to one aspect of the present disclosure, a plurality of the ropes are provided.

[0016] In addition, the pumping device according to one aspect of the present disclosure further includes a fitting for connecting the piping to the pump, and the piping and the fitting are fixed to each other in advance to form a prefabricated piping.

[0017] In addition, a construction method using a pumping device according to one embodiment of the present disclosure is a construction method using the pumping device, comprising a preparation process for preparing the pumping device and an arrangement process for placing the pump together with the lower end side of the piping in the well.

[0018] In addition, in a construction method using a pumping device according to one aspect of the present disclosure, the pumping device is provided with a ground unit, and after the placement process, further includes a cutting process for cutting an upper portion of the piping at a position where the piping can be connected to the ground unit, and a connecting process for connecting the upper portion of the piping after cutting to the ground unit. [Effects of the Invention]

[0019] According to one aspect of the present disclosure, it is possible to improve the workability of the pumping device while maintaining the performance of the pumping pipe. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a side view showing the overall configuration of a water pumping device according to a first embodiment; [Figure 2] (a) Schematic diagram showing prefabricated piping. (b) Schematic diagram showing the rolled piping body. (c) Diagram showing the dimensions of the prefabricated piping. [Figure 3] 10A is a schematic cross-sectional view showing another example of the piping main body, and FIG. 10B is a diagram showing dimensions of the piping main body according to the another example. [Figure 4] 10A is a schematic cross-sectional view showing another example of the piping main body, and FIG. 10B is a diagram showing dimensions of the piping main body according to the another example. [Figure 5] A schematic side view showing the pumping device under construction. [Figure 6] FIG. 10 is a side view showing a pumping device according to a second embodiment. [Figure 7] FIG. 10 is a side view showing a pumping device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] The pumping device 1 according to the first embodiment will be described below.

[0022] The pumping device 1 shown in Figure 1 is used to pump water from a well. In this embodiment, a pumping device 1 installed in a relatively deep well (deep well W) will be described as an example. The pumping device 1 mainly includes a submersible pump 10, prefabricated piping 20, a cover 30, a fixing band 40, a ground-side joint 50, a supply piping 60, a ground unit 70, a power cord 80, and a rope 90.

[0023] The submersible pump 10 is placed underwater to pump water. The submersible pump 10 is formed in a shape that allows it to be placed in a deep well W. In this embodiment, the submersible pump 10 is formed in a generally cylindrical shape with its axis oriented vertically. The submersible pump 10 can pump water from the deep well W from its upper end. The submersible pump 10 is formed from, for example, stainless steel.

[0024] The prefabricated piping 20 shown in Figures 1 and 2 is for guiding water pumped by the submersible pump 10 to the outside (above ground) of the deep well W. The prefabricated piping 20 mainly comprises a piping body 21, a joint 22, etc.

[0025] The pipe body 21 is a cylindrical pipe having a substantially circular cross section. The pipe body 21 is formed, for example, from a synthetic resin. Examples of synthetic resins that can be used include polyolefin resins such as polyethylene (PE) and polybutene (PB), and polyvinyl chloride resins such as polyvinyl chloride (PVC). The pipe body 21 is flexible. Therefore, the pipe body 21 can bend when an external force is applied by an operator or the like. The pipe body 21 is formed in a longitudinal shape corresponding to the depth of the deep well W. Specifically, the pipe body 21 is formed to a length that allows the submersible pump 10 connected to one end of the pipe body 21 to be positioned in the deep well W, and the other end of the pipe body 21 to reach the outside of the deep well W (above ground). With this configuration, the pipe body 21 can be formed seamlessly from the submersible pump 10 to the aboveground portion (more specifically, the aboveground joint portion 50 described below).

[0026] The properties of the preferred material of the pipe body 21 will be described below.

[0027] The specific gravity of the pipe body 21 is 0.90 g / cm 3 More than 1.50g / cm 3 Preferably, it is 1.00 g / cm or less, and more preferably, it is 1.00 g / cm 3 The following is more preferred:

[0028] Furthermore, the tensile modulus of elasticity (Young's modulus) of the pipe body 21 at 20° C. is preferably 200 MPa or more and 3000 MPa or less, and more preferably 1500 MPa or less.

[0029] If the pipe body 21 has a specific gravity and a tensile modulus within the above-mentioned ranges, the pipe body 21 (wound pipe) wound into a circle is suitable for being held manually. Such a pipe body 21 is also easy to work with and suitable for withstanding the internal water pressure during pumping. Furthermore, if the pipe body 21 has a specific gravity and a tensile modulus within the above-mentioned ranges, it is unlikely to be damaged by thermal expansion and contraction even if a temperature difference occurs in the pipe body 21, and therefore does not require expansion and contraction treatment, making it suitable.

[0030] FIG. 2(c) shows an example of dimensions of a prefabricated pipe 20 having a polyethylene pipe body 21. The table in FIG. 2(c) lists the dimensions of each component shown in FIGS. 2(a) and 2(b). Specifically, as shown in FIGS. 2(a) and 2(b), D in FIG. 2(c) represents the average outer diameter of the pipe body 21, t represents the thickness of the pipe body 21, L represents the length (pipe length) of the pipe body 21, φMD represents the outer diameter of the circularly wound pipe body 21 (coiled tube), φMd represents the inner diameter of the coiled tube, and MW represents the thickness of the coiled tube. The reference total weight of the processed product in FIG. 2(c) represents the combined weight of the pipe body 21, the fitting 22, and the EF (electrofusion) fitting 22a.

[0031] 3 also shows an example of the dimensions of a double-layered polyethylene pipe as another example of the piping body 21. The dimensions shown in FIG. 3 comply with the standards defined in JIS K 6762, and therefore have the ability to adequately withstand the internal water pressure during pumping. The table in FIG. 3(b) lists the dimensions of each part shown in FIG. 3(a).

[0032] 4 also shows an example of dimensions of a polybutene pipe as another example of the pipe body 21. The dimensions shown in FIG. 4 comply with the standards defined in JIS K 6778. The table in FIG. 4(b) lists the dimensions of each part shown in FIG. 4(a).

[0033] The joint 22 shown in Figures 1 and 2 is for connecting the piping main body 21 to the submersible pump 10. The joint 22 is provided at one end of the piping main body 21. The joint 22 is made of gunmetal (bronze). This reduces the potential difference with the submersible pump 10 and suppresses the occurrence of electrolytic corrosion. The joint 22 is fixed to the piping main body 21 by EF joining. Specifically, the joint 22 is fixed to the piping main body 21 by heating and fusing EF joints 22a fitted to the piping main body 21 and the piping provided to the joint 22.

[0034] The prefabricated piping 20 is transported to the construction site (deep well W) in a state where it has been manufactured in advance at a factory or the like (with the fittings 22 fixed to the piping body 21). In this way, because the prefabricated piping 20 is manufactured in advance to a length appropriate to the deep well W, work at the construction site such as joining the piping and fittings or performing a water pressure test on the fixed (connected) parts, which cannot be confirmed once installed in the deep well, is not required, improving construction efficiency. Furthermore, because the prefabricated piping 20 (piping body 21) can be transported and installed by hand in a rolled-up state, no tower is required, which saves space during construction and improves transportability and workability.

[0035] The lid 30 shown in Fig. 1 covers the top (opening to the ground) of the deep well W. The lid 30 is appropriately formed with openings (through holes) through which the piping body 21, a power cord 80 (described later), a rope 90, etc. can be inserted. The lid 30 is formed with a hook portion 31.

[0036] The hook portion 31 is a portion to which a rope 90, which will be described later, is engaged. The hook portion 31 is formed, for example, in the shape of a rod with one end fixed to the lid portion 30. The hook portion 31 is formed on the upper portion of the lid portion 30 (outside the deep well W). In this embodiment, two hook portions 31 are formed (one on each side in FIG. 1).

[0037] The fixing band 40 is for holding the prefabricated piping 20. The fixing band 40 is fixed to the prefabricated piping 20 (piping body 21) above the lid portion 30 (outside the deep well W). This makes it possible to prevent the prefabricated piping 20 from falling.

[0038] The ground-side joint 50 is for connecting the prefabricated piping 20 to a supply piping 60, which will be described later. The ground-side joint 50 in this embodiment is formed in a substantially L-shape. One end of the ground-side joint 50 is connected to the upper end of the prefabricated piping 20 (piping main body 21).

[0039] The supply pipe 60 guides the water delivered via the prefabricated pipe 20 to the ground unit 70, which will be described later. One end of the supply pipe 60 is connected to the other end of the ground-side joint 50. Various devices can be provided midway through the supply pipe 60, as needed. As an example, in this embodiment, a pressure reducing valve 61 is provided midway through the supply pipe 60.

[0040] The ground unit 70 supplies the water pumped from the deep well W by the submersible pump 10 to the water supply destination. The ground unit 70 is provided with various devices as needed. For example, the ground unit 70 may be provided with a pressure tank, a display device for displaying various information, a control device for controlling each part, a water supply port, a storage box for storing each device, etc.

[0041] The power cord 80 is used to supply power to the submersible pump 10. One end of the power cord 80 is connected to the submersible pump 10. The power cord 80 is arranged to extend vertically along the deep well W. The power cord 80 is guided to the outside of the deep well W via the lid 30. The other end of the power cord 80 is connected to an external power source (not shown). A middle portion of the power cord 80 is fixed to a middle portion of the prefabricated piping 20 (piping main body 21) with an appropriate fixing device 81 (e.g., an insulation lock, etc.). The power cord 80 is fixed to the piping main body 21 at multiple points. At this time, it is preferable to fix the power cord 80 to the piping main body 21 while leaving some slack in the power cord 80 so as not to apply unnecessary load (tension) to the power cord 80.

[0042] The rope 90 is for supporting the load of the submersible pump 10. One end of the rope 90 is fixed to the top of the submersible pump 10. The rope 90 is arranged so as to extend up and down along the deep well W. The rope 90 is guided to the outside of the deep well W via the cover portion 30. The top of the rope 90 is fixed to the hook portion 31. At this time, the load of the submersible pump 10 is applied to the rope 90, and the rope 90 is adjusted so that tension is applied to the rope 90.

[0043] An example of a method for constructing the water pumping device 1 configured as described above will be described below.

[0044] First, the prefabricated piping 20 to be used in the water pumping device 1 is prepared in advance (piping preparation process). Specifically, the piping body 21 and the joint 22 are fixed in advance by EF joint in a factory or the like. By forming the prefabricated piping 20 in a factory or the like instead of at the construction site in this way, piping processing at the construction site is not required. This eliminates the need to bring processing equipment to the construction site, and also reduces the workload at the construction site.

[0045] Next, each component of the pumping device 1 (submersible pump 10, prefabricated piping 20, etc.) and necessary equipment are transported to the construction site where the deep well W is being built and prepared (preparation process). At this time, the prefabricated piping 20 is wound into a circular shape (coil pipe) as shown in Figure 2. By using the flexible prefabricated piping 20 in this way, space can be saved during transportation.

[0046] Next, at the construction site, the submersible pump 10 is connected to the prefabricated piping 20 (pump connection process). At this time, since the prefabricated piping 20 is provided with the fittings 22 in advance, the submersible pump 10 can be easily connected to the prefabricated piping 20.

[0047] Next, as shown in Figure 5, the submersible pump 10 is placed in the deep well W together with the lower end of the prefabricated piping 20 (placement process). The prefabricated piping 20 connected to the submersible pump 10 is also inserted into the deep well W together with the submersible pump 10. At this time, a rope 90 is connected to the submersible pump 10, so that the load of the submersible pump 10 can be supported by the rope 90. This prevents the load of the submersible pump 10 from being excessively applied to the prefabricated piping 20 and prevents the submersible pump 10 from falling. Note that a stainless steel wire or the like can be used in addition to (or instead of) the rope 90.

[0048] In addition, in the placement process, as shown in FIG. 5, it is also possible to use a pulley P to guide the prefabricated piping 20. The pulley P can be supported, for example, by a tower or the like. As shown in FIG. 5, the prefabricated piping 20 is flexible, so work can be performed with the prefabricated piping 20 rolled up in a circular shape. This allows for space savings during work. Also, unlike when installing a straight pipe that is not flexible, there is no need to support a long straight pipe directly above the deep well W. Therefore, there is no need to install a relatively large support member (a tower, etc.) to support the piping, which allows for space savings and a reduction in the workload.

[0049] Next, after the submersible pump 10 has been inserted to a predetermined depth into the deep well W, the upper part of the prefabricated piping 20 is cut (cutting process). At this time, the prefabricated piping 20 is cut at a position that allows it to be connected to the above-ground unit 70 (above-ground joint 50) described below (indirectly connectable via the above-ground joint 50).

[0050] Next, the upper part of the prefabricated piping 20 (after cutting) is fixed onto the lid part 30 (fixing process). Specifically, as shown in FIG. 1, the upper part of the deep well W is covered with the lid part 30, and the prefabricated piping 20 is inserted into the lid part 30. A fixing band 40 is fixed to the upper part of the prefabricated piping 20 (above the lid part 30). In this way, the prefabricated piping 20 is fixed onto the lid part 30.

[0051] Additionally, the upper portion of the rope 90 is fixed to two hook portions 31 formed on the cover portion 30. At this time, a certain amount of tension is applied to the rope 90 so that the load of the submersible pump 10 is applied to the rope 90. This makes it possible to prevent the load of the submersible pump 10 from being applied to the prefabricated piping 20, and to prevent deformation or damage to the prefabricated piping 20.

[0052] Next, the ground unit 70 and the like are installed (ground unit installation process). Specifically, the ground unit 70, supply pipe 60, ground joint 50, and the like are installed near the deep well W. Furthermore, the upper part of the prefabricated pipe 20 is connected to the ground joint 50, and the upper part of the prefabricated pipe 20 is connected to the ground unit 70 (indirectly via the supply pipe 60 and ground joint 50) (connection process). In this way, the submersible pump 10 is connected to the ground unit 70, and water from the deep well W can be supplied to the ground via the ground unit 70. In this embodiment, the upper part of the prefabricated piping 20 is indirectly connected to the ground unit 70 via the supply piping 60 and the ground-side joint 50, but the present invention is not limited to this configuration. For example, the upper part of the prefabricated piping 20 may be configured to be directly connected to the ground unit 70.

[0053] The above-mentioned construction method is an example, and the order and contents of the construction steps can be changed as needed. Also, the construction method of the water pumping device 1 has been explained as an example, but for example, when performing maintenance (inspection, replacement, etc.) of the water pumping device 1, the prefabricated piping 20 (piping body 21) can be wound up in a circular shape, thereby saving space and improving workability.

[0054] The following describes modified examples (other embodiments) of the water pumping device 1. In the following description, only configurations different from the first embodiment will be described, and a description of configurations similar to the first embodiment will be omitted.

[0055] The pumping device 1B according to the second embodiment shown in Fig. 6 differs from the pumping device 1 according to the first embodiment (see Fig. 1) in that the rope 90 is fixed to the prefabricated piping 20. Specifically, the middle part of the rope 90 is fixed to the middle part of the prefabricated piping 20 (piping main body 21) by an appropriate fastener 82 (for example, an insulation lock, etc.). The rope 90 is fixed to the piping main body 21 at multiple points.

[0056] In this way, by fixing the rope 90 to the piping main body 21, the piping main body 21 can be reinforced by the rope 90. This makes it possible to suppress the occurrence of creep (deformation) of the piping main body 21.

[0057] The pumping device 1C of the third embodiment shown in Figure 7 differs from the pumping device 1 of the first embodiment (see Figure 1) in that two ropes (rope 90a and rope 90b) are provided. Note that the power cord 80 is not shown in Figure 7. By providing multiple (two) ropes 90a and 90b in this way, the submersible pump 10 can be supported in a stable position. This makes it possible to prevent the submersible pump 10 from tilting and coming into contact with the wall of the deep well W during installation or use of the pumping device 1C.

[0058] When the submersible pump 10 is supported by multiple (two) ropes 90a and 90b, as in the pumping device 1C according to the third embodiment, it is desirable to fix the ropes 90a and 90b in positions that allow for balanced support of the submersible pump 10. For example, when using two ropes 90a and 90b, it is desirable to fix the two ropes 90a and 90b in positions that are approximately symmetrical on either side of the center (axis) in a planar view on the top surface of the submersible pump 10. Furthermore, when using three or more ropes, it is desirable to fix the ropes at equal intervals on the circumference of the top surface of the submersible pump 10, centered on the center (axis) in a planar view.

[0059] As described above, the pumping device 1 according to this embodiment has the following features: A pumping device 1 for pumping water from a well (deep well W), A pump (submersible pump 10) disposed in the well for pumping water; A flexible pipe (piping body 21) connected to the pump and guiding the water pumped from the pump to the outside of the well; It is equipped with the following. By configuring in this way, it is possible to improve the workability of the pumping device 1 while maintaining the performance (soundness) of the pumping pipe. Specifically, by using flexible piping, for example, it is possible to insert a circularly wound piping into a well, and to rewind the piping taken out of the well into a circular shape, which saves space during construction and improves transportability and workability.

[0060] Further, the piping is It is made of synthetic resin. By configuring the pipe in this way, the pipe is made of synthetic resin, which is lighter than ordinary steel pipes, and no special equipment is required, so the pumping pipe can be manually inserted and removed from the well. It also helps prevent corrosion (such as electrolytic corrosion).

[0061] In addition, the pumping device 1 is The water supply system further includes a joint (ground-side joint 50) connected to the piping for guiding the water guided by the piping to the ground unit 70, The piping is The pump is formed seamlessly from the pump to the joint. This configuration eliminates the need to connect multiple separate pipes at the construction site, improving workability. Furthermore, the lack of connections prevents water leakage due to improper connection work, ensuring the performance of the pumping device (piping).

[0062] Further, the piping is It is formed in an elongated shape. By configuring it in this way, by using a long pipe, there is no need to connect multiple divided pipes at the construction site, which simplifies material management and improves construction efficiency.

[0063] In addition, the pumping device 1 is It further comprises a rope 90 connected to the pump and bearing the load of the pump. With this configuration, the load of the pump is supported by the rope 90, thereby reducing the load applied to the piping. This makes it possible to suppress the occurrence of creep (deformation) of the piping. Furthermore, by connecting the rope 90 to the pump during construction, it is possible to prevent the pump from falling during construction.

[0064] In addition, in the pumping device 1B according to the second embodiment, The middle part of the rope 90 It is fixed to the middle of the pipe. With this configuration, the piping can be reinforced with the rope 90, and creep (deformation) of the piping can be suppressed.

[0065] In addition, in the pumping device 1C according to the third embodiment, The ropes 90a and 90b are There are multiple ones provided. With this configuration, the load of the pump is supported by multiple ropes, making it possible to support the pump in a stable position.

[0066] In addition, the pumping device 1 is a coupling 22 for connecting the piping to the pump; The piping and the joint 22 are fixed to each other in advance to form a prefabricated piping 20 . By configuring in this manner, it is not necessary to perform the work of fixing the pipe and the joint 22 at the construction site, thereby improving workability.

[0067] Further, the construction method using the pumping device 1 according to this embodiment is as follows: A construction method using the pumping device 1, a preparation step of preparing the water pumping device 1; an arrangement step of arranging the pump together with the lower end side of the piping in the well; It is equipped with the following. By configuring in this way, it is possible to improve the workability of the pumping device 1 while maintaining the performance (soundness) of the pumping pipe.

[0068] In addition, in the construction method using the pumping device 1 according to this embodiment, The water pumping device 1 includes a ground unit 70, a cutting step of cutting an upper portion of the pipe at a position where the pipe can be connected to the ground unit 70 after the placing step; The method further includes a connecting step of connecting the upper portion of the pipe after cutting to the ground unit 70. This configuration allows the pipe to be cut at the construction site to adjust the pipe length, enabling flexible response according to the construction situation. In particular, the pipe body 21 according to this embodiment can be cut relatively easily, which also helps prevent an increase in the workload at the construction site.

[0069] The deep well W according to this embodiment is one embodiment of the well according to the present invention. The submersible pump 10 according to this embodiment is one embodiment of the pump according to the present invention. The pipe body 21 according to this embodiment is one embodiment of the pipe according to the present invention. The ground-side joint 50 according to this embodiment is one embodiment of the joint according to the present invention.

[0070] Although the embodiments of the present invention have been described above, the present invention is not limited to the above configurations, and various modifications are possible within the scope of the invention described in the claims.

[0071] For example, the configurations described in the first to third embodiments can be combined with each other. As an example, the plurality of ropes 90a and 90b according to the third embodiment can be fixed to the piping main body 21 in the same manner as in the second embodiment.

[0072] In addition, in the above embodiment, the pipe body 21 is formed from a synthetic resin, but the present invention is not limited to this. In other words, the material of the pipe body 21 is not particularly limited as long as it is flexible.

[0073] Furthermore, the pumping device 1 exemplified in the above embodiment is not limited to application to deep wells W, but can also be applied to various wells (for example, relatively shallow wells, etc.). [Explanation of symbols]

[0074] 1. Pumping equipment 10 Submersible Pump 20 Prefabricated Piping 21 Piping body 50 Ground side joint 70 ground units 90 Rope

Claims

1. A pumping device for pumping water from a well, comprising: a pump disposed in the well for pumping water; a flexible pipe connected to the pump and guiding the water pumped from the pump to the outside of the well; A pumping device comprising:

2. The piping is It is made of synthetic resin, The water pumping device according to claim 1.

3. a coupling portion connected to the piping for guiding water guided by the piping to a ground unit; The piping is The pump is formed seamlessly from the pump to the joint. The water pumping device according to claim 1.

4. The piping is It is formed in an elongated shape, The water pumping device according to claim 1.

5. further comprising a rope connected to the pump and supporting the load of the pump; The water pumping device according to claim 1.

6. The middle part of the rope It is fixed to the middle part of the pipe.

6. The water pumping device according to claim 5.

7. The rope is There are several 6. The water pumping device according to claim 5.

8. further comprising a coupling for connecting the piping to the pump; The piping and the joint are fixed to each other in advance to form a prefabricated piping. The water pumping device according to claim 1.

9. A construction method using the pumping device according to claim 1, a preparation step of preparing the water pumping device; an arrangement step of arranging the pump together with the lower end side of the piping in the well; A construction method using a pumping device equipped with the following:

10. the water pumping device comprises an above-ground unit; a cutting step of cutting an upper portion of the pipe at a position where the pipe can be connected to the ground unit after the placing step; and a connecting step of connecting the upper part of the pipe after cutting to the ground unit. A construction method using the water pumping device according to claim 9.

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