Baler Equipment

Abstract

To provide a baler device capable of efficiently cleaning wells. [Solution] The device comprises a bailer section (2) having a cylindrical first tubular member (11) with at least a partial opening at each of the front and rear ends (11B), and an on-off valve (15) that opens when pressure is applied from the outside to the inside to the opening at the front end (11B) and closes when pressure is applied from the inside to the outside to the opening, a second tubular member (12) that is positioned so that its inner surface (12A) is spaced radially outward from the outer surface (11A) of the first tubular member (11), and is fixed to the first tubular member (11) so that its front end (12B) is open and the gap with the outer surface (11A) at the rear end is closed, and one or more through holes (17) formed in the side wall of the second tubular member (12).

Description

[Technical Field]

[0001] The present invention relates to a baler device. [Background technology]

[0002] To construct a well, the following steps must be carried out in order: Step 1: Drill a well hole using a cutting edge (hereinafter referred to as the "bit"). Step 2: A casing and a strainer pipe with a through hole in the side wall are installed in series in the hole (commonly called a "bare hole") formed in step 1. The through hole is for guiding well water into the pipe. Step 3: Pea gravel is filled into the gap between the casing and strainer tube and the inner wall of the hole as a filter medium. Step 4: Remove the mud wall that has formed on the inner wall of the hole.

[0003] In the above step 1, cuttings are generated during drilling using the bit, and these cuttings accumulate at the bottom of the hole (hereinafter referred to as the "well bottom"), hindering drilling. To prevent this, muddy water (water mixed with clay) is always stored in the hole. This allows the cuttings to mix with the muddy water near the well bottom, reducing the amount of cuttings that accumulates at the well bottom.

[0004] Then, for example, a baler disclosed in Patent Document 1 is brought to the bottom of the well, and an on-off valve at the tip of the baler is opened inward, so that the muddy water near the bottom of the well, the cuttings contained in the muddy water, and the cuttings accumulated on the bottom of the well are all taken into the baler and discharged to the surface. However, to prevent the inner wall of the hole from collapsing, muddy water is always stored in the hole.

[0005] Additionally, to prevent the inner wall of the hole from collapsing, a mud wall has formed on the wall. Therefore, in step 4 above, this mud wall is removed to complete the well. To remove the mud wall, a bailer is raised and lowered inside the casing and strainer tube while the mud remains in the hole. When the bailer is raised, the negative pressure (suction effect) generated near the tip (bottom) of the bailer removes the mud wall through the perforations formed in the strainer tube. The removed mud wall is then discharged to the surface by the bailer through the perforations along with the mud. Furthermore, removing the mud wall allows groundwater to enter the hole. This gradually dilutes the mud, eventually making it usable as well water.

[0006] In step 4 above, the through-holes of the strainer tube may be clogged with clay (muddy water and mud walls). In this case, the clay can be removed in the same manner as above by moving the bailer up and down inside the casing and strainer tube.

[0007] Furthermore, while the completed well is in use, the through-hole of the strainer pipe may become clogged with scale. In this case, the scale can be removed in the same manner as above by moving the bailer up and down inside the casing and strainer pipe while well water is still in the hole.

[0008] When each cleaning is performed using a bailer as described above, jetting cleaning is often performed on the inner surfaces of the casing and strainer tube using, for example, a jetting cleaning device, either before or after (or both). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-329578 Summary of the Invention [Problem to be solved by the invention]

[0010] As mentioned above, when cleaning a well following its construction and use, the use of a bailer and jetting cleaning device as in the past not only required the time and effort of switching between these devices, but also resulted in problems such as a long cleaning time.

[0011] In view of such problems, an object of the present invention is to provide a baler device that can efficiently clean wells. [Means for solving the problem]

[0012] In order to solve the above problems, a baler device according to a first aspect of the present invention comprises a baler section having a first cylindrical member that is cylindrical and has at least a partial opening at each of its front and rear ends, and an on-off valve that opens when pressure is applied from the outside to the inside to the opening at the front end and closes when pressure is applied from the inside to the outside to the opening, a second cylindrical member that is arranged so that its inner circumferential surface is spaced radially outward from the outer circumferential surface of the first cylindrical member, and is fixed to the first cylindrical member so that its front end is open and its rear end closes the gap with the outer circumferential surface, and one or more through holes formed in the side wall of the second cylindrical member.

[0013] In the second aspect of the present invention, the maximum valve opening degree of the on-off valve can be manually selected from a plurality of predetermined angles that are set in advance.

[0014] In addition, in a third aspect of the present invention, the second cylindrical member further includes an expanding member that is installed on the outer peripheral surface of the second cylindrical member, and when the second cylindrical member is inserted inside the strainer tube, the gap between the second cylindrical member and the inner peripheral surface of the strainer tube is smaller in the radial direction than the gap between the second cylindrical member and the inner peripheral surface of the strainer tube.

[0015] In addition, in a fourth aspect of the present invention, the device further includes a brush that is installed on the outer peripheral surface of the second cylindrical member and that comes into sliding contact with the inner peripheral surface of the strainer tube when the second cylindrical member is inserted inside the strainer tube.

[0016] In addition, in a fifth aspect of the present invention, the expanding member is installed in the second cylindrical member closer to the tip end than the through hole, and the brush is installed in the second cylindrical member closer to the rear end than the through hole.

[0017] In a sixth aspect of the present invention, the brush is detachable from the second cylindrical member.

[0018] In a seventh aspect of the present invention, the diameter expanding member is detachable from the second cylindrical member.

[0019] In addition, in an eighth aspect of the present invention, the device further includes a connecting member that connects the first tubular member and the second tubular member at a predetermined position other than the rear end of the second tubular member. [Effects of the Invention]

[0020] The baler device according to the present invention can efficiently clean wells. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is an overall perspective view schematically illustrating a baler apparatus according to an embodiment of the present invention. [Figure 2] FIG. 2 is a view taken along the line II-II in FIG. [Figure 3] 2 is an enlarged view of the vicinity of the tip of the first cylindrical member shown in FIG. 1. [Figure 4] 2 is a schematic diagram showing the state in which the baler device of FIG. 1 is inserted inside a casing and a strainer pipe. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. To facilitate understanding of the description, the same components in the drawings will be denoted by the same reference numerals as appropriate, and duplicated descriptions will be omitted as appropriate.

[0023] == Implementation form == An embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described below.

[0024] <Configuration> FIG. 1 is an overall view that schematically shows a baler apparatus 1 according to this embodiment. Moreover, Fig. 2 is a view seen from the arrow II-II in Fig. 1. In Fig. 2, parts that cannot actually be seen due to the angle are shown by dashed lines.

[0025] As shown in FIG. 1, the baler device 1 includes a baler section 2, a jetting section 3, a connecting member 13, a diameter expansion member 18, a first brush 19, and a second brush 20 as main components.

[0026] The bailer section 2 mainly includes a first cylindrical member 11 and an on-off valve 15 .

[0027] The first cylindrical member 11 is a cylindrical member having at least a partial opening at each of the front end 11B and the rear end 11C. Note that Fig. 2 shows an example in which the entire rear end 11C is open. Furthermore, as an example, the first cylindrical member 11 is preferably a carbon steel pipe for low-pressure piping.

[0028] The on-off valve 15 is a valve that opens when pressure is applied from the outside to the inside to the tip 11B, and closes when pressure is applied from the inside to the outside to the tip 11B. The on-off valve 15 is preferably a flat valve.

[0029] The jetting portion 3 mainly includes a second cylindrical member 12 and a through hole 17 .

[0030] The second cylindrical member 12 is disposed such that its inner peripheral surface 12A is spaced radially outward from the outer peripheral surface 11A of the first cylindrical member 11, and is fixed to the first cylindrical member 11 such that its front end 12B is open and its rear end 12C closes the gap between the outer peripheral surface 11A and the front end 12B (see FIG. 2 for the closed rear end 12C). As an example, the second cylindrical member 12 is preferably a carbon steel pipe for high-pressure piping. The second cylindrical member 12 is disposed so as to extend parallel to the first cylindrical member 11, is shorter than the first cylindrical member 11 in the extension direction, and is disposed closer to the front end 11B than the center of the first cylindrical member 11 in the extension direction.

[0031] One or more (preferably multiple) through holes 17 are formed in at least a predetermined range R of the side wall of the second cylindrical member 12. As an example, the diameter of the through hole 17 is preferably 2 mm or more and 4 mm or less. Also, as an example, the number of through holes 17 is preferably 10 to 14 arranged in the circumferential direction of the second cylindrical member 12, and 6 to 12 arranged in the extension direction of the second cylindrical member 12.

[0032] Furthermore, although not shown, the through holes 17 may be internally threaded, i.e., holes with threads formed on the inner circumferential surface, and detachable blind plugs (male threads) may be provided for the through holes 17. This makes it possible to adjust the number of through holes 17 that actually produce the effect of the jet water stream described below (those through holes 17 into which no blind plugs are inserted produce this effect).

[0033] Here, Fig. 3 is an enlarged view of the vicinity of the tip 11B of the first cylindrical member 11 shown in Fig. 1. In Fig. 3, an on-off valve 15 that opens and closes inside the first cylindrical member 11 is shown by a broken line. 3, the tip 11B of the first cylindrical member 11 is formed with an opening and a lid 14. The lid 14 occupies approximately half of the tip 11B (tip surface) of the first cylindrical member 11. The opening is preferably approximately semicircular.

[0034] The on-off valve 15 is a valve that opens and closes the opening. That is, the on-off valve 15 is provided so as to switch between an open state and a closed state at the opening at the tip 11B, and has a shape (approximately semicircular) that corresponds to the opening. The on-off valve 15 opens inwardly of the first cylindrical member 11, and to prevent it from opening outwardly, a flange portion 15A is formed that protrudes radially inward from the edge of the opening. The flange portion 15A is formed on the entire or part of the edge of the opening. In the closed state, the on-off valve 15 is caught on this flange portion 15A, so that it does not open outwardly from the first cylindrical member 11.

[0035] The maximum valve opening angle of the on-off valve 15 can be manually selected from a plurality of predetermined angles. It is preferable that the plurality of predetermined angles be within 45 degrees, for example. For example, if four predetermined angles are set, they may be 3 degrees, 15 degrees, 30 degrees, 45 degrees, etc.

[0036] As shown in Figures 1 and 3, a through hole 21 is formed in the side wall of the first cylindrical member 11 near the tip 11B. The through hole 21 does not face the axis OA of the first cylindrical member 11, but is formed so as to extend parallel to the rotation axis OR, which is the rotation center when the on-off valve 15 is opened and closed (in Figure 3, from the front to the back of the page). Although not shown, a similar through hole is also formed in the side wall of the first cylindrical member 11 at the end where the extension direction of the through hole 21 is extended. A thin rod-shaped locking member 16 is installed so that both ends are inserted into these through holes. The locking member 16 can be inserted and removed from these through holes by hand.

[0037] When the opening degree of the on-off valve 15 becomes large, it comes into contact with the locking member 16 and cannot be opened any further. Therefore, the maximum opening degree of the valve is determined by the installation position of the locking member 16. As shown in FIG. 3, the through-holes 21 (and corresponding through-holes not shown) are formed at a plurality of positions along the rotation direction of the on-off valve 15.

[0038] In this way, it is possible to manually select the position of the through-hole 21 (and the corresponding through-hole) at which the locking member 16 is to be installed. That is, the installation position of the locking member 16 can be changed. By changing the installation position, the maximum valve opening degree of the on-off valve 15 is changed. In other words, the maximum valve opening degree of the on-off valve 15 can be manually selected from a plurality of predetermined angles that have been set in advance.

[0039] Like the through hole 17, the through hole 21 may be a female screw, i.e., a hole with a screw formed on the inner circumferential surface, and a removable blind plug (male screw) may be provided for the through hole 21. The same applies to the through hole corresponding to the through hole 21. As a result, when the bailer device 1 is inserted into the strainer pipe and casing as described below and lowered toward the bottom of the well, and the on-off valve 15 is opened, the amount of water (including muddy water; the same applies below) entering the inside of the first cylindrical member 11 from the opening can be adjusted (part of the muddy water (or water) that has entered the inside of the first cylindrical member 11 leaks out from the through hole 21 into which a blind plug has not been inserted and from through holes not shown).

[0040] Here, FIG. 4 is a schematic diagram showing a state in which the baler device 1 of FIG. 1 is inserted inside the strainer tube 30 and the casings 31A, 31B, 31C, and 31D.

[0041] The casings 31A, 31B, 31C, and 31D and the strainer pipe 30 are installed so as to be connected in series with one another within the well hole 32. In FIG. 4, as an example, the strainer pipe 30 is connected so as to be in the second position from the bottom. A plurality of through holes 30A are formed in the side wall of the strainer pipe 30. Pea gravel 33 is filled in the gaps between the casings 31A, 31B, 31C, and 31D and the strainer pipe 30 and the inner wall of the hole 32.

[0042] The diameter expansion member 18 is attached to the outer peripheral surface 12D of the second cylindrical member 12. When the second cylindrical member 12 (baler device 1) is inserted into the casings 31A, 31B, 31C, and 31D and the strainer tube 30, the gap between the second cylindrical member 12 and the inner peripheral surfaces of these casings 31A, 31B, 31C, and 31D and the strainer tube 30 is smaller in the radial direction than the gap between the second cylindrical member 12 and the inner peripheral surfaces of these casings 31A, 31B, 31C, and 31D and the strainer tube 30. However, it is preferable that the diameter expansion member 18 does not contact these inner peripheral surfaces and is spaced apart from these inner peripheral surfaces. Furthermore, the diameter expansion member 18 is attached to the second cylindrical member 12 closer to the tip than the through hole 30A. Furthermore, the diameter expansion member 18 can be manually attached to and detached from the second cylindrical member 12 in advance.

[0043] The first brush 19 and the second brush 20 are annular brushes that are installed on the outer peripheral surface 12D of the second cylindrical member 12 and come into sliding contact with the inner peripheral surfaces of the casings 31A, 31B, 31C, 31D and the strainer tube 30 when the second cylindrical member 12 is inserted inside these.

[0044] The first brush 19 is disposed in the second cylindrical member 12 between the through hole 17 (predetermined range R) and the diameter-expanding member 18. The second brush 20 is disposed in the second cylindrical member 12 on the rear end side of the through hole 17 (predetermined range R). The first brush 19 and the second brush 20 can be attached to and detached from the second cylindrical member 12 by hand in advance.

[0045] Specifically, the first brush 19 and the second brush 20 have an annular support (not shown) and numerous bristles whose bases are supported by the support. The support is fixed (by bolts or the like) to the outer circumferential surface 12D of the second cylindrical member 12. The tips of the bristles are preferably positioned so that they face radially outward from the first cylindrical member 11 and the second cylindrical member 12 (i.e., toward the strainer tube 30 and the inner circumferential surfaces of the casings 31A, 31B, 31C, and 31D). The first brush 19 and the second brush 20 are preferably made of a material softer than the strainer tube 30. For example, nylon or polypropylene is preferred.

[0046] 1, the connecting member 13 is a member that connects the first cylindrical member 11 and the second cylindrical member 12 at a predetermined position other than the rear end 12C. The connecting member 13 preferably connects the first cylindrical member 11 and the second cylindrical member 12 at the front end 12B of the second cylindrical member 12.

[0047] <Cleaning method> A cleaning method using the baler apparatus 1 will now be briefly described with reference to FIG. 4 and other figures. In the following, an example will be described in which the bailer device 1 is used in step 4 of the well construction already described.

[0048] First, one end of string 36 is attached to a round bar (iron bar) 37 connected to the rear end of the baler apparatus 1 (rear end 11C of the first cylindrical member 11). Incidentally, round bar (iron bar) 37 is used to attach string 36. The other end of string 36 is connected to a reel 35A attached to an excavator 35 located on the ground 34. The operator can adjust the length of string 36 by rotating reel 35A. In this way, the baler apparatus 1 is lowered from its tip end through the casings 31A, 31B, 31C, 31D and the inside of the strainer pipe 30 toward the bottom of the well (the bottom of the well bore 32) at a predetermined speed.

[0049] While the baler device 1 is being lowered, the on-off valve 15 installed at the tip 11B of the first cylindrical member 11 is open. However, the maximum valve opening angle is determined by the installation position of the locking member 16. Muddy water then enters the interior of the first cylindrical member 11 and the gap between the outer surface 12D of the first cylindrical member 11 and the inner surface 12A of the second cylindrical member. This muddy water is forced upward toward the rear end (i.e., upward) and sprayed outward (toward the strainer tube 30 and the inner surfaces of the casings 31A, 31B, 31C, and 31D) through the through-hole 17, which does not have a blind plug. This performs jetting cleaning on the strainer tube 30 and the inner surfaces of the casings 31A, 31B, 31C, and 31D. In addition to the jetting cleaning, the strainer tube 30 and the inner surfaces of the casings 31A, 31B, 31C, and 31D are brushed using a first brush 19 and a second brush 20 fixed before and after the specified range R in which the through hole 17 is formed.

[0050] Thereafter, when the tip 11B of the first cylindrical member 11 of the bailer device 1 reaches near the bottom of the well, muddy water (including dirt that has been peeled off from the strainer tube 30 and casings 31A, 31B, 31C, and 31D by jetting cleaning) is contained inside the first cylindrical member 11.

[0051] The length of the string 36 is then adjusted using the reel 35A to lift the baler device 1. When the baler device 1 is raised, the on-off valve 15 is closed due to negative pressure, allowing the muddy water inside the first cylindrical member 11 to be lifted. The lifted muddy water is then discharged.

[0052] Furthermore, due to the negative pressure generated inside the strainer tube 30 and the casings 31A, 31B, 31C, and 31D when the baler apparatus 1 is being lifted, the muddy water in the area filled with pea gravel 33 outside the strainer tube 30 and the casings 31A, 31B, 31C, and 31D flows into the strainer tube 30 and the casings 31A, 31B, 31C, and 31D through the through-hole 30A of the strainer tube 30. The water flow at this time can break down the mud wall formed on the inner wall of the hole 32. The broken mud wall mixes with the muddy water and flows into the strainer tube 30 and the casings 31A, 31B, 31C, and 31D through the through-hole 30A.

[0053] Then, by adjusting the length of the string 36 with the reel 35A, the baler device 1 is raised and lowered, and the above-mentioned operation is repeated, which clears the clogging of the through-hole 30A and gradually removes the mud wall of the hole 32. In this way, the baler device 1 cleans the well.

[0054] The above is a description of an example of a cleaning method using the baler apparatus 1. In the above description, the baler 1 is used in step 4 of the well construction already explained, but the baler 1 may also be used to remove the excavation waste generated in step 1. Furthermore, as already explained, if the through-hole of the strainer pipe becomes clogged with scale while the completed well is in use, the baler 1 may also be used when well water has accumulated in the hole. In either case, the movement of the baler 1 itself may be the same.

[0055] <Action and effect> The baler device 1 of this embodiment comprises a baler section 2 having a cylindrical first cylindrical member 11 with at least a portion open at each of the front end 11B and the rear end 11C, and an on-off valve 15 that opens when pressure is applied from the outside to the inside to the opening of the front end 11B and closes when pressure is applied from the inside to the outside to the opening, a second cylindrical member 12 that is arranged so that its inner surface 12A is spaced radially outward from the outer surface 11A of the first cylindrical member 11, and is fixed to the first cylindrical member 11 so that its front end 12B is open and the gap with the outer surface 11A at the rear end is closed, and one or more through holes 17 formed in the side wall of the second cylindrical member 12. As a result, a jetting effect is achieved while the baler apparatus 1 is being lowered into the strainer pipe 30 and casings 31A, 31B, 31C, and 31D with the tip 11B facing downward, and a baler effect (the effect of scooping up water) is achieved while the lowered baler apparatus 1 is being pulled up from the strainer pipe 30 and casings 31A, 31B, 31C, and 31D. Therefore, in this embodiment, there is no need to replace multiple devices as in the past, and the well can be cleaned efficiently.

[0056] Furthermore, in the baler apparatus 1 according to this embodiment, the maximum valve opening degree of the on-off valve 15 can be manually selected from a plurality of predetermined angles that have been set in advance. When the baler device 1 is lowered downward inside the strainer tube 30 and the casings 31A, 31B, 31C, and 31D, the less water flows into the interior from the tip 11B of the first cylindrical member 11, the more forcefully the water flows into the gap between the second cylindrical member 12 and the first cylindrical member 11 from the tip 12B side, and the force of the water sprayed from the through hole 17 increases, thereby promoting the jetting effect. On the other hand, when the baler apparatus 1 is pulled up, the smaller the inflow amount, the less effective the baler is (the effect of scooping up and discharging water). The inflow amount changes depending on the maximum valve opening degree of the on-off valve 15. The optimal balance between the jetting effect and the effect as a bailer varies depending on the various conditions of the strainer tube 30 and the casings 31A, 31B, 31C, and 31D, so convenience is improved by allowing the maximum valve opening to be selected manually, as in this embodiment.

[0057] In addition, the baler device 1 of this embodiment further includes an expanding member 18 that is installed on the outer peripheral surface 12D of the second cylindrical member 12, and when the second cylindrical member 12 is inserted inside the strainer tube 30 and the casings 31A, 31B, 31C, and 31D, the gap between the second cylindrical member 12 and the inner peripheral surface of the strainer tube 30 is radially smaller than the gap between the second cylindrical member 12 and the inner peripheral surface of the strainer tube 30. This enhances the jetting effect and the effectiveness of the baler. That is, since water is less likely to move through the gap between the strainer tube 30 (and casings 31A, 31B, 31C, 31D) and the second cylindrical member 12, when the baler device 1 is lowered into the water, water flows more forcefully into the gap between the second cylindrical member 12 and the first cylindrical member 11. This increases the force of the water sprayed from the through-holes 17, thereby enhancing the jetting effect.

[0058] In addition, the baler device 1 of this embodiment further includes brushes 19, 20 that are installed on the outer peripheral surface 12D of the second cylindrical member 12 and that come into sliding contact with the inner peripheral surface of the strainer tube 30 when the second cylindrical member 12 is inserted inside the strainer tube 30. This makes it possible to more effectively clean the inner circumferential surface of the strainer tube 30 (and the casings 31A, 31B, 31C, and 31D).

[0059] The diameter expanding member 18 is disposed on the second cylindrical member 12 closer to the tip end than the through hole 17 , and the brush 20 is disposed on the second cylindrical member 12 closer to the rear end than the through hole 17 . This improves the stability of the baler device 1 when it is moved up and down within the strainer pipe 30 and the casings 31A, 31B, 31C, and 31D.

[0060] In the baler apparatus 1 according to this embodiment, the brushes 19 and 20 are detachable from the second cylindrical member 12. This allows the brushes 19 and 20 to be replaced or washed, thereby preventing a decrease in cleaning ability.

[0061] In the baler apparatus 1 according to this embodiment, the diameter expanding member 18 is detachable from the second cylindrical member 12. This allows the diameter expanding member 18 to be replaced or washed, preventing a decrease in washing ability.

[0062] The baler 1 according to this embodiment further comprises a connecting member 13 that connects the first cylindrical member 11 and the second cylindrical member 12 at a predetermined position other than the rear end 12C of the second cylindrical member 12. This makes it possible to more reliably fix the first tubular member 11 and the second tubular member 12. For example, if the connecting member 13 is not provided, the second tubular member 12 would be fixed to the first tubular member 11 only by its rear end 12C, which would reduce the strength.

[0063] == Variations == The present invention is not limited to the above-described embodiments. In other words, designs that are produced by those skilled in the art with appropriate design modifications to the above-described specific examples are also included within the scope of the present invention as long as they include the features of the present invention. Furthermore, the elements of the above-described embodiments and the following modifications can be combined to the extent technically possible, and such combinations are also included within the scope of the present invention as long as they include the features of the present invention.

[0064] For example, in the above embodiment, the tip 11B of the first cylindrical member 11 is formed with an opening and a lid 14, and the lid 14 occupies approximately half of the tip 11B (tip surface) of the first cylindrical member 11. Also, the on-off valve 15 is provided so as to switch between an open state and a closed state at the opening of the tip 11B. However, the lid 14 may not be provided, and the entire tip 11B may be made into an opening that is closed by the on-off valve 15.

[0065] For example, the rear end 11C of the first cylindrical member 11 may be partially open rather than entirely.

[0066] Furthermore, a nozzle with a variable angle may be provided in the through-hole 17 of the baler device 1. This allows the spray direction of the jet water stream to be changed according to the on-site environment.

[0067] Furthermore, the baler device 1 may be equipped with a motor or a hydraulic turbine to automatically rotate the first brush 19 and / or the second brush 20. This can improve the cleaning effect of brushing.

[0068] Furthermore, a container that is open at the top and that can store the cleaning chemical liquid may be attached to the gap between the outer peripheral surface 11A of the first cylindrical member 11 and the inner peripheral surface 12A of the second cylindrical member 12. In this way, when the baler device 1 is inserted into the strainer pipe 31, water enters the gap, causing the cleaning chemical liquid to mix with the water, and a chemical cleaning effect can be superimposed on the jet water flow.

[0069] Furthermore, a plurality of types of first brushes 19 each having different bristle types may be prepared. The same applies to the second brush 20. This allows appropriate brushing depending on the condition of the inner circumferential surface of the strainer tube 31. [Explanation of symbols]

[0070] 1: Baler device 2: Baler section 3: Jetting section 11: First cylindrical member 12:Second cylindrical member 13: Connecting member 17:Through hole 18: Expanding member 19: First brush 20: Second brush

Claims

1. a baler section having a first cylindrical member at least partially open at each of the front and rear ends, and an on-off valve that opens when pressure is applied from the outside to the inside to the opening at the front end, and closes when pressure is applied from the inside to the opening; a second cylindrical member whose inner circumferential surface is disposed so as to be spaced radially outward from the outer circumferential surface of the first cylindrical member, whose front end is open and whose rear end is fixed to the first cylindrical member so as to close a gap between the second cylindrical member and the outer circumferential surface, and one or more through holes formed in a side wall of the second cylindrical member; A baler device comprising:

2. The maximum valve opening angle of the on-off valve can be manually selected from a plurality of predetermined angles.

2. The baler apparatus of claim 1.

3. the second cylindrical member is further provided with an expanding diameter member that is installed on the outer peripheral surface of the second cylindrical member, and when the second cylindrical member is inserted inside the strainer tube, the gap between the second cylindrical member and the inner peripheral surface of the strainer tube is smaller in the radial direction than the gap between the second cylindrical member and the inner peripheral surface of the strainer tube; 3. A baler apparatus according to claim 1 or 2.

4. The strainer tube further includes a brush that is disposed on the outer peripheral surface of the second cylindrical member and that comes into sliding contact with the inner peripheral surface of the strainer tube when the second cylindrical member is inserted into the strainer tube.

4. The baler apparatus of claim 3.

5. the enlarged diameter member is disposed on the second cylindrical member closer to the tip end than the through hole, and the brush is disposed on the second cylindrical member closer to the rear end than the through hole; 5. The baler apparatus of claim 4.

6. The brush is detachable from the second cylindrical member.

5. The baler apparatus of claim 4.

7. The diameter expanding member is detachable from the second cylindrical member.

4. The baler apparatus of claim 3.

8. a connecting member that connects the first tubular member and the second tubular member at a predetermined position other than the rear end of the second tubular member, 3. A baler apparatus according to claim 1 or 2.

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