Clip, and filter attachment method and filter replacement method using the same

Abstract

To provide a clip excellent in operability, and a filter mounting method and a filter replacing method using the clip.SOLUTION: The clip 1 is composed of a pair of long members 3a and 3b, and can clip a filter as an object. A pinching part 10 for pinching the filter is provided on one end side in the longitudinal direction of the long members 3a and 3b. Also, a grip part 20 formed to be grippable is provided on the other end side in the longitudinal direction of the long members 3a and 3b. Furthermore, the long members 3a and 3b are pivotally supported and connected at the connecting part 30 provided between the gripping part 10 and the gripping part 20 so that the long members 3a and 3b can be opened and closed with respect to each other. Furthermore, the clip 1 is configured such that the long members 3a and 3b can move relative to each other in the longitudinal direction while the filter is being clipped.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a clamping tool and a filter installation method and filter replacement method using the same, and more particularly to a clamping tool for clamping a filter attached to a drainage pipe installed in a retaining wall made of masonry, concrete blocks, etc., and a filter installation method and filter replacement method using the clamping tool. [Background technology]

[0002] Patent Document 1 discloses a conventional method for attaching a filter to a drainage pipe. The drainage pipe is a cylindrical pipe that is already installed underground. The filter includes a bottomed tubular section that fits into the inner diameter of the drainage pipe, and a flange section that extends radially outward from the end of the bottomed tubular section and abuts against the back surface of the retaining wall underground, with a fibrous filter disposed inside the bottomed tubular section.

[0003] To install such a filter on a drain pipe, first, a slit is cut from the outer edge of the filter's flange to near the center, and the periphery of the slit is partially overlapped to reduce the filter's outer diameter. Next, the tubular portion in its reduced diameter state is inserted into the inner diameter of the installation plug pipe. Its restoring force presses the tubular portion against the inner surface of the pipe, securing the filter to the end of the installation plug pipe. The tip of the installation plug pipe with the filter attached is then inserted through the outer opening of the drain pipe and pushed forward until it is near the buried (soil) end. The flange protruding outward from the outer surface of the installation plug pipe is then hooked onto the buried end of the drain pipe. When the installation plug pipe is then retracted, the filter is released from the installation plug pipe and positioned at the buried end of the drain pipe. Once the filter is positioned, the installation plug pipe is removed to complete the procedure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-068576 Summary of the Invention [Problem to be solved by the invention]

[0005] The filter installation method described in Patent Document 1 allows a filter to be installed without removing the existing drain pipe. However, it requires the use of a filter with a specific structure. Furthermore, the installation insert pipe requires the use of a separate rod when removing the filter from the installation insert pipe, which is time-consuming. Furthermore, the installation insert pipe is specifically designed for installing filters, and is not designed to replace filters that deteriorate over time after installation.

[0006] An object of the present invention is to provide a clamping tool that is easy to operate and a filter installation method and replacement method using the same. [Means for solving the problem]

[0007] In order to achieve the above object, the invention described in claim 1 is a clamping device consisting of a pair of elongated members for clamping an object, comprising a clamping portion provided at one longitudinal end of the pair of elongated members for clamping the object, a gripping portion provided at the other longitudinal end of the pair of elongated members and formed to be grippable, and a connecting portion between the clamping portion and the gripping portion for connecting the elongated members by pivoting them so that they can be opened and closed relative to each other, and configured so that when the object is clamped, the elongated members can move relative to each other in the longitudinal direction.

[0008] With this configuration, it becomes easier to adjust the posture of the object while it is still being held.

[0009] The invention described in claim 2 is the same as the invention described in claim 1, in which the connection portion has a long hole provided in one of the elongated members, and is fastened by a fastener that passes through the long hole and the other elongated member when the one and the other elongated members are overlapped.

[0010] With this configuration, one elongated member can be moved in the longitudinal direction relative to the other elongated member by the length of the elongated hole.

[0011] The invention described in claim 3 is the configuration of the invention described in claim 2, in which the connection portion is movable by a fastener between a first position which is the end of the long hole on the clamping portion side and a second position which is the end of the long hole on the gripping portion side, and can be fixed by the fastener between the first position and the second position.

[0012] With this configuration, one elongated member can be freely moved and fixed relative to the other elongated member between the first position and the second position of the slot.

[0013] The invention described in claim 4 is the same as the invention described in claim 2 or claim 3, in which the fastener is composed of a bolt and a nut, the bolt passes through the long hole and the other side of the elongated member, and the nut fits onto the bolt from the back side of the other side of the elongated member.

[0014] With this configuration, it is possible to easily change the state of the elongated members between a movable state and a fixed state depending on the degree of fastening of the bolts and nuts.

[0015] The invention described in claim 5 is the same as the invention described in claim 1, in which the connection portion has a first elongated hole on one side of the elongated member and a second elongated hole similar to the first elongated hole on the other side of the elongated member, and is fastened by a fastener that passes through the first elongated hole and the second elongated hole while the first elongated hole and the second elongated hole are overlapped.

[0016] With this configuration, the one elongated member and the other elongated member can be moved relatively in the longitudinal direction by the length of the first elongated hole and the second elongated hole.

[0017] The invention described in claim 6 is the configuration of the invention described in claim 5, wherein the connecting portion is movable by a fastener between a first position which is the clamping portion side end of the first long hole and the second long hole and a second position which is the gripping portion side end of the first long hole and the second long hole, and can be fixed by the fastener between the first position and the second position.

[0018] With this configuration, the one elongated member and the other elongated member can be freely moved and fixed between the first position and the second position of the first elongated hole and the second elongated hole.

[0019] The invention described in claim 7 is the same as the invention described in claim 5 or claim 6, in which the fastener is composed of a bolt and a nut, the bolt passes through the first elongated hole and the second elongated hole, and the nut fits onto the bolt from the back side of the second elongated hole.

[0020] With this configuration, it is possible to easily change the state of the elongated members between a movable state and a fixed state depending on the degree of fastening of the bolts and nuts.

[0021] The invention described in claim 8 is the same as the invention described in claim 1, in which the clamping part has a hook part at the tip thereof that can hook an object.

[0022] With this configuration, it is possible to hold the object while hooking it.

[0023] The invention as set forth in claim 9 is the same as the invention as set forth in claim 8, in which the hook portions have a hook shape that faces inward to each other.

[0024] With this configuration, the hooked object is less likely to come off.

[0025] The invention described in claim 10 is configured in the invention described in claim 8 or claim 9, in which the clamping portion is provided on the connection portion side of the hook portion and has a movement prevention portion that prevents the object from moving toward the connection portion side.

[0026] With this configuration, the object is prevented from moving toward the connecting portion.

[0027] The invention as set forth in claim 11 is the configuration of the invention as set forth in claim 10, wherein the movement preventing portions have a mountain-like shape that protrudes inward toward each other.

[0028] With this configuration, the object is reliably prevented from moving toward the connecting portion.

[0029] The invention described in claim 12 is the same as the invention described in claim 1, in which the grip portion has a ring-shaped opening.

[0030] With this configuration, a finger can be passed through the opening.

[0031] The invention described in claim 13 is a filter installation method for attaching a filter having a filter body attached to a circular dish-shaped frame body having a flexible flange portion on its peripheral portion to a cylindrical drain pipe buried in a retaining wall, and includes the following steps: a clamping step of clamping the filter frame body with the clamping device described in claim 1; an attitude adjustment step of adjusting the attitude of the filter so that it is inclined with respect to the length of the drain pipe by moving the long members of the clamping device relative to each other in the longitudinal direction; an insertion step of inserting the adjusted filter from the front side to the back side of the drain pipe by inserting the clamping device into the drain pipe; and an fitting step of adjusting the inserted filter to a position where it abuts against the back end of the drain pipe, fitting it into the back end, and then releasing the clamped state.

[0032] With this configuration, the height from the top to the bottom of the flange portion of the filter when its position is adjusted is shorter than the height of the inner diameter of the drain pipe, reducing resistance when inserting the filter.

[0033] The invention described in claim 14 is the same as the configuration of the invention described in claim 13, and further includes an attitude fixing step of fixing the attitude of the adjusted filter by fixing the connection part after the attitude adjustment step.

[0034] With this configuration, the filter can be inserted into the drain pipe while maintaining a fixed posture.

[0035] The invention described in claim 15 is configured in the invention described in claim 13 such that a number of small holes are formed in the bottom of the dish of the filter frame, and in the clamping process, one of the clamping parts of the clamping tool is hooked onto one of the small holes, and the other of the clamping parts of the clamping tool is hooked onto the other of the small holes, and the long members are moved in the closing direction to clamp the filter.

[0036] With this configuration, the filter can be caught and clamped.

[0037] The invention described in claim 16 is a filter replacement method for replacing a filter that is attached to a cylindrical drain pipe buried in a retaining wall and has a filter body attached to a circular dish-shaped frame having a flexible flange portion on its periphery, and includes a first clamping step of clamping the frame of the filter by inserting the clamping tool described in claim 1 into the drain pipe, a first position adjustment step of adjusting the position of the clamped filter so that it is inclined with respect to the length direction of the drain pipe by moving the long members of the clamping tool relative to each other in the longitudinal direction, and a second position adjustment step of removing the clamping tool from the drain pipe to attach the adjusted filter to the drain pipe. the second clamping step of clamping the frame of the new filter with a clamping tool; the second position adjustment step of adjusting the position of the new filter so that it is inclined relative to the longitudinal direction of the drain pipe by moving the long members of the clamping tool relative to each other in the longitudinal direction; the insertion step of inserting the new filter, whose position has been adjusted, from the front side to the back side of the drain pipe by inserting the clamping tool into the drain pipe; and the fitting step of adjusting the inserted new filter so that it abuts against the back end of the drain pipe and fitting it into the back end, and then releasing the clamped state.

[0038] With this configuration, the height from the upper end to the lower end of the flange portion of the filter when its position is adjusted is shorter than the height of the inner diameter of the drain pipe, reducing resistance when pulling out and inserting the filter.

[0039] The invention described in claim 17 is the same as the invention described in claim 16, and further includes a first attitude fixing step of fixing the filter whose attitude has been adjusted by fixing the connection portion after the first attitude adjustment step.

[0040] With this configuration, the filter can be pulled out from the drain pipe while maintaining a fixed posture.

[0041] The invention described in claim 18 is the configuration of the invention described in claim 16 or claim 17, further comprising a second attitude fixing step of fixing the attitude of the new filter whose attitude has been adjusted by fixing the connection part after the second attitude adjustment step.

[0042] With this configuration, the filter can be inserted into the drain pipe while maintaining a fixed posture.

[0043] The invention described in claim 19 is configured in the invention described in claim 16, in which a number of small holes are formed in the bottom of the dish of the filter frame, and in the first clamping step and the second clamping step, one of the clamping parts of the clamping tool is hooked into one of the small holes and the other of the clamping parts of the clamping tool is hooked into the other of the small holes, and the elongated members are moved in the closing direction to clamp the filter.

[0044] With this configuration, the filter can be caught and clamped. [Effects of the Invention]

[0045] As explained above, the invention of claim 1 makes it easy to adjust the posture of the object while it is being clamped, resulting in a clamping tool with excellent operability.

[0046] In addition to the effect of the invention described in claim 1, the invention described in claim 2 makes it easier to adjust the posture of the object by allowing one elongated member to be moved longitudinally relative to the other elongated member by the length of the long hole.

[0047] In addition to the effect of the invention described in claim 2, the invention described in claim 3 makes it possible to freely move and fix one elongated member relative to the other elongated member between the first position and the second position of the elongated hole, making it even easier to adjust the posture of the object.

[0048] The invention described in claim 4 has the same effect as the invention described in claim 2 or claim 3, and in addition, it is possible to easily change the movable state of the elongated members and the fixed state depending on the degree of tightening of the bolt and nut, making it a user-friendly clamping device.

[0049] In addition to the effect of the invention described in claim 1, the invention described in claim 5 makes it easy to fine-tune the posture of the object, since one elongated member and the other elongated member can be moved relatively in the longitudinal direction by the length of the first elongated hole and the second elongated hole.

[0050] In addition to the effect of the invention described in claim 5, the invention described in claim 6 makes it possible to freely move and fix one elongated member and the other elongated member between the first position and the second position of the first elongated hole and the second elongated hole, making it even easier to fine-tune the posture of the object.

[0051] The invention described in claim 7 has the same effect as the invention described in claim 5 or claim 6, and in addition, it is possible to easily change the movable state of the elongated members and the fixed state depending on the degree of tightening of the bolt and nut, making it a user-friendly clamping device.

[0052] The invention of claim 8 has the effect of the invention of claim 1, and in addition, it is possible to clamp an object while hooking it, so that the object can be clamped securely.

[0053] The invention of claim 9 has the same effect as the invention of claim 8, and in addition, the hooked object is less likely to come off, so the hooked state of the object is stabilized.

[0054] The invention of claim 10 has the same effect as the invention of claim 8 or 9, and in addition, prevents the object from moving toward the connecting portion, so that the object is held in a stable state.

[0055] The invention of claim 11 has the effect of the invention of claim 10, and in addition, the object is reliably prevented from moving toward the connecting portion, so that the object is more stably held.

[0056] The invention of claim 12 has the same effect as the invention of claim 1, and in addition, since a finger can be passed through the inside of the opening, operability is improved.

[0057] In the invention described in claim 13, the height from the upper end to the lower end of the flange portion of the filter, whose posture has been adjusted, is shorter than the height of the inner diameter of the drain pipe, thereby reducing resistance when inserting the filter and making it easier to attach the filter to the drain pipe.

[0058] The invention described in claim 14 has the same effect as the invention described in claim 13, but in addition, it allows the filter to be inserted into the drain pipe while maintaining a fixed posture, making it even easier to attach the filter to the drain pipe.

[0059] The invention described in claim 15 has the same effect as the invention described in claim 13, but also allows the filter to be hooked and clamped, making it possible to stably attach the filter to the drain pipe.

[0060] In the invention described in claim 16, the height from the upper end to the lower end of the flange portion of the filter, whose posture has been adjusted, is shorter than the height of the inner diameter of the drain pipe, thereby reducing resistance when pulling out and inserting the filter, making it easier to replace the filter in the drain pipe.

[0061] The invention described in claim 17 has the same effect as the invention described in claim 16, but in addition, the filter can be removed from the drain pipe while maintaining a fixed posture, making it even easier to replace the filter in the drain pipe.

[0062] The invention described in claim 18 has the same effect as the invention described in claim 16 or claim 17, and in addition, the filter can be inserted into the drain pipe while maintaining a fixed posture, making it even easier to replace the filter in the drain pipe.

[0063] The invention described in claim 19 has the effect of the invention described in claim 16, and in addition, the filter can be hooked and clamped, making it possible to stably replace the filter in the drain pipe. [Brief explanation of the drawings]

[0064] [Figure 1] 1 is a schematic front view of a clamping tool according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic rear view of the clamping tool shown in FIG. [Figure 3] 2 is a schematic view showing a state in which a pair of elongated members of the clamping tool shown in FIG. 1 are moved relatively to each other in the longitudinal direction. FIG. [Figure 4] 2 is a schematic view showing a state in which the clamping tool shown in FIG. 1 is in an open state. FIG. [Figure 5] 1 is a schematic perspective view of a filter according to a first embodiment of the present invention. [Figure 6] FIG. 6 is a schematic bottom view of the filter shown in FIG. 5. [Figure 7] 1 is a schematic diagram showing a structure of a retaining wall according to a first embodiment of the present invention. [Figure 8] 10 is a schematic diagram showing a clamping step of clamping a filter with a clamping tool. FIG. [Figure 9] 9 is a schematic diagram showing an attitude adjusting step and an attitude fixing step for adjusting the attitude of the clamped filter in FIG. 8 so that the filter is inclined relative to the longitudinal direction of the drain pipe. [Figure 10] 10 is a schematic view showing a state during an insertion process in which the filter whose position has been adjusted in FIG. 9 is inserted into the drain pipe. FIG. [Figure 11] 11 is a schematic diagram showing a fitting step in which the filter inserted in FIG. 10 is fitted into the drain pipe and then released from the clamping state of the filter by the clamping tool. [Figure 12] FIG. 10 is a schematic view showing a first clamping step of clamping the filter with a clamping tool in the filter replacement method according to the second embodiment of the present invention. [Figure 13]13 is a schematic diagram showing a first attitude adjusting step and a first attitude fixing step for adjusting the attitude of the clamped filter in FIG. 12 so that the filter is inclined relative to the longitudinal direction of the drain pipe. FIG. [Figure 14] 14 is a schematic view showing a state during a removal process in which the filter whose position has been adjusted in FIG. 13 is removed from the drain pipe. FIG. [Figure 15] 15 is a schematic diagram showing the completed state of the extraction process in which the filter extracted in FIG. 14 has been completely extracted from the drain pipe. FIG. [Figure 16] FIG. 11 is a schematic front view of a clamping tool according to a third embodiment of the present invention, corresponding to FIG. [Figure 17] 17 is a schematic rear view of the clamping tool shown in FIG. 16, and corresponds to FIG. 2. FIG. [Figure 18] 17 is a schematic view showing a state in which a pair of elongated members of the clamping tool shown in FIG. 16 are moved relatively to each other in the longitudinal direction, and corresponds to FIG. 3. FIG. [Figure 19] 17 is a schematic view showing the state in which the clamping tool shown in FIG. 16 is in an open state, and corresponds to FIG. 4. FIG. [Figure 20] 10A to 10C are schematic diagrams showing the bottom of a filter dish according to other embodiments, (1) being the fourth embodiment, (2) being the fifth embodiment, and (3) being the sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0065] FIG. 1 is a schematic front view of a clamping tool according to a first embodiment of the present invention, and FIG. 2 is a schematic rear view of the clamping tool shown in FIG.

[0066] 1 and 2, the clamping tool 1 is composed of a pair of elongated members 3a and 3b punched from steel plate and is capable of clamping a filter for a drainage pipe (described later), which is the object of clamping. The elongated members 3a and 3b are configured so that their longitudinal lengths are longer than the length of the drainage pipe (described later). A clamping section 10 for clamping a filter (described later) is provided at one longitudinal end (the lower side in FIGS. 1 and 2) of the elongated members 3a and 3b. A gripping section 20 configured to be grippable is provided at the other longitudinal end (the upper side in FIGS. 1 and 2). Furthermore, the elongated members 3a and 3b are connected at a connection section 30 between the clamping section 10 and the gripping section 20, crossing each other so that the elongated members 3a and 3b overlap each other.

[0067] Next, the clamping portion 10, the gripping portion 20, and the connecting portion 30 will be described in detail.

[0068] The clamping portion 10 has hook-shaped tips facing inward, and has hooking portions 11a and 11b that can hook a filter (described later). Furthermore, the clamping portion 10 is formed with mountain-shaped protrusions that face inward on the connecting portion 30 side of the hooking portions 11a and 11b, and is provided with movement prevention portions 12a and 12b that prevent the filter (described later) from unintentionally moving toward the connecting portion 30 side. The specific clamping state of the filter by the clamping tool 1 and the effect of configuring the clamping portion 10 in this way will be described later.

[0069] The grip portion 20 has ring-shaped openings 21a and 21b formed in each of the pair of elongated members 3a and 3b. This allows fingers to pass through the openings 21a and 21b, improving operability.

[0070] Figure 3 is a schematic diagram showing a state in which a pair of elongated members of the clamping device shown in Figure 1 have been moved relative to each other in the longitudinal direction, and Figure 4 is a schematic diagram showing a state in which the clamping device shown in Figure 1 has been opened.

[0071] 3 and 4, the connection portion 30 pivotally connects the elongated members 3a and 3b to each other so that they can be opened and closed. Specifically, the elongated members 3a and 3b are connected to each other at the connection portion 30 so that they overlap and cross each other, as described above. When the gripping portions 20 are moved in the opening direction, i.e., directions in which they move away from each other, the clamping portions 10 also move in the opening direction, i.e., directions in which they move away from each other, and the elongated members 3a and 3b are opened. On the other hand, when the gripping portions 20 are moved in the closing direction, i.e., directions in which they move toward each other, the clamping portions 10 also move in the closing direction, i.e., directions in which they move toward each other. When the movement of the gripping portions 20 and the clamping portions 10 in the closing direction is completed, the elongated members 3a and 3b are closed as shown in FIGS. 1 and 2.

[0072] One elongated member 3a has a slot 31, and the other elongated member 3b has a circular hole (not shown) at a position overlapping the vicinity of a first position 32, which is the end of the slot 31 of the elongated member 3a on the side of the clamping portion 10. The elongated members 3a and 3b are fastened together with a fastener 35 passing through the slot 31 of the elongated member 3a and the circular hole of the elongated member 3b. The fastener 35 is composed of a bolt 36 and a nut 37. The bolt 36 passes through the slot 31 and the circular hole of the elongated member 3b from the front side (surface side) of the elongated member 3a, and the nut 37 fits into the bolt 36 from the back side (rear side) of the elongated member 3b. Because the shaft of the bolt 36 passes through the elongated hole 31, when the nut 37 is loosened, the bolt 36 is movable within the elongated hole 31 between a first position 32 of the elongated hole 31 and a second position 33, which is the end of the elongated hole 31 on the gripping portion 20 side, as shown in Figures 1 and 3. Furthermore, by tightening the nut 37, the connecting portion 30 can be fixed at any position between the first position 32 and the second position 33, making it possible to fix the entire elongated members 3a, 3b.

[0073] The fasteners 35 fix the longitudinal positional relationship of the elongated members 3a and 3b, but do not hinder the opening and closing of the elongated members 3a and 3b. However, the fasteners 35 may be configured to fix the open and closed states by tightening the fasteners more firmly.

[0074] This relative longitudinal movement of the elongated members 3a, 3b is possible not only when the elongated members 3a, 3b are in a closed state but also when they are in an open state, which allows the elongated members 3a, 3b to move relative to each other in the longitudinal direction while sandwiching a filter (described later), as will be described in detail later.

[0075] The effect of configuring the connection portion 30 in this way will be described later.

[0076] FIG. 5 is a schematic perspective view of a filter according to a first embodiment of the present invention, and FIG. 6 is a schematic bottom view of the filter shown in FIG.

[0077] Referring to Figure 5, filter 40 has a circular filter body 48 made of nonwoven fabric mounted inside a resin frame 41 that is dish-shaped and has a flexible flange 42 on its periphery. Also referring to Figure 6, a number of small holes 44 are formed in the dish bottom 43 of frame 41 of filter 40. Such filter 40 is attached to the inner end (the side that comes into contact with sediment) of a drainage pipe, which will be described later, and serves to hold back sediment while discharging only water that can pass through filter body 48 and small holes 44 from the drainage pipe.

[0078] FIG. 7 is a schematic diagram showing the structure of a retaining wall according to the first embodiment of the present invention.

[0079] 7, the retaining wall 50 is not shown in detail, but is a masonry retaining wall made of piled up stones 51, and has cylindrical drainage pipes 60 attached at predetermined intervals. The back side of the retaining wall 50 and the drainage pipes 60 (the right side in FIG. 7) is filled with soil 52 or the like as a permeable layer.

[0080] No drainage filter is attached to this drainage pipe 60. The diameter of the flange portion 42 of the frame 41 of the filter 40 shown in Figure 5 is slightly larger than the inner diameter of the drainage pipe 60. As a result, when the filter 40 is fitted into the drainage pipe 60, the flange portion 42 covers the outer surface of the rear end portion 62 of the drainage pipe 60, reducing the risk of the filter 40 tipping over toward the front side of the drainage pipe 60.

[0081] Next, a filter mounting method for mounting the filter 40 on the drain pipe 60 using the clamping tool 1 described above will be described.

[0082] First, the clamping step of the filter mounting method will be described.

[0083] FIG. 8 is a schematic diagram showing a clamping step in which the filter is clamped by a clamping tool.

[0084] 8 and again with reference to FIG. 6, first, gripping portion 20 of clamping tool 1 is operated in the opening direction to slightly open elongated members 3a, 3b. Next, hooking portion 11a of clamping portion 10 is hooked onto any one of small holes 44 of filter 40, and similarly, hooking portion 11b is hooked onto any other of small holes 44. Next, gripping portion 20 is operated in the closing direction to move elongated members 3a, 3b toward each other in the closing direction, thereby sandwiching filter 40 and completing the process of clamping filter 40.

[0085] Furthermore, as explained in Figures 1 and 2, the clamping device 1 is provided with movement prevention portions 12a, 12b on the clamping portion 10, so that the insertion of the clamping portion 10 into the inside of the filter 40 is prevented by the movement prevention portions 12a, 12b, and it is possible to prevent the filter main body 48 from falling off from the frame body 41 of the filter 40 shown in Figure 4 due to excessive insertion of the hook portions 11a, 11b.

[0086] In this state, when the flange portion 42 of the filter 40 is aligned with the front end portion 61 of the drain pipe 60, as described above, the diameter of the flange portion 42 of the frame body 41 of the filter 40 is formed to be slightly larger than the inner diameter of the drain pipe 60, so the height-wise length L1 of the diameter of the flange portion 42 is longer than the height-wise length L2 of the inner diameter of the drain pipe 60.

[0087] Next, the attitude adjusting step and attitude fixing step in the filter mounting method will be described.

[0088] FIG. 9 is a schematic diagram showing an attitude adjusting step and an attitude fixing step for adjusting the attitude of the filter clamped in FIG. 8 so that it is inclined relative to the longitudinal direction of the drain pipe.

[0089] 9 and again referring to FIG. 3, while the filter 40 is clamped, the fastener 35 of the connection part 30 of the clamping tool 1 is moved from the first position 32 of the elongated hole 31 of the elongated member 3a to the second position 33, thereby moving the elongated members 3a and 3b relative to each other in the longitudinal direction. Accordingly, the orientation of the filter 40 is tilted at a predetermined angle relative to the longitudinal direction of the drainage pipe 60. While this tilt angle is not particularly limited, it is preferable to tilt the filter 40 by about 30° (about 60° relative to the longitudinal direction of the drainage pipe 60) from the state in which the filter 40 is aligned with the drainage pipe 60. Adjusting the orientation of the filter 40 in this manner completes the orientation adjustment process.

[0090] Next, when the fasteners 35 are tightened to fix the connection portion 30, the entire elongated members 3a and 3b are also fixed. This maintains the position of the filter 40 adjusted in the position adjustment step. Fixing the position of the filter 40 in this way completes the position fixing step.

[0091] When this filter 40 is tilted, the length L3 in the height direction (in Figure 9, the direction perpendicular to the insertion direction of the filter 40) from the upper end 46a to the lower end 46b of the flange portion 42 of the frame body 41 of the filter 40 is shorter than the length L2 in the height direction of the inner diameter of the drain pipe 60.

[0092] Next, the insertion step in the filter mounting method will be described.

[0093] FIG. 10 is a schematic view showing a state during the insertion process in which the filter whose orientation has been adjusted in FIG. 9 is inserted into the drain pipe.

[0094] Referring to FIG. 10 , the clamping device 1 with the connection portion 30 fixed thereto is inserted into the drain pipe 60 from the front toward the back, and the filter 40, whose position has been adjusted, is then inserted into the drain pipe 60 from the front toward the back. As described above, the diameter of the flange portion 42 of the filter 40 is slightly larger than the inner diameter of the drain pipe 60. Therefore, in the depth direction of the filter 40 (the direction penetrating the paper in FIG. 10 ), depth-direction ends 47a and 47b of the flange portion 42 are pressed against the inner surface of the drain pipe 60. Meanwhile, the height-direction length L3 from the upper end 46a to the lower end 46b of the flange portion 42 of the filter 40 is shorter than the height-direction length L2 of the inner diameter of the drain pipe 60. Therefore, the flange portion 42 of the filter 40 is spaced apart from the inner surface of the drain pipe 60. This reduces the resistance of the filter 40 to the drain pipe 60 when it is inserted.

[0095] The insertion process is completed when the filter 40 is inserted beyond the rear end 62 of the drain pipe 60. If sediment 52 has accumulated on the rear side of the rear end 62 of the drain pipe 60, the sediment 52 can be pushed aside by inserting the filter 40.

[0096] Next, the fitting step in the filter mounting method will be described.

[0097] FIG. 11 is a schematic diagram showing a fitting step in which the filter inserted in FIG. 10 is fitted into the drain pipe and then released from the clamping state of the filter by the clamping tool.

[0098] Referring to FIG. 11 and again to FIG. 1, after the filter 40 passes the rear end 62 of the drain pipe 60, the fastener 35 of the connection portion 30 of the clamping device 1 is loosened to release the fixed state of the elongated members 3a and 3b. The fastener 35 is then moved from the second position 33 of the elongated hole 31 of the elongated member 3a to the first position 32, thereby moving the elongated members 3a and 3b relative to each other. This again changes the orientation of the filter 40, so that the flange portion 42 of the frame 41 of the filter 40 is aligned with the rear end 62 of the drain pipe 60. In other words, the filter 40 is adjusted to a position in which it abuts against the rear end 62 of the drain pipe 60. In this state, the clamping device 1 is pulled out toward the front of the drain pipe 60, and the filter 40 is fitted so that the flange portion 42 of the filter 40 abuts against the rear end 62 of the drain pipe 60. Thereafter, the hooks 11a and 11b of the clamping portion 10 of the clamping tool 1 are pulled out of the small holes 44 of the filter 40, and the clamped state is released, thereby completing the fitting process of the filter 40.

[0099] Finally, the clamping tool 1 is pulled out in the direction toward the front of the drain pipe 60 as indicated by the arrow, thereby completing the attachment of the filter 40 to the drain pipe 60.

[0100] As described above, this type of filter installation method involves adjusting the position of the filter 40 through the position adjustment process before inserting it into the drain pipe 60.Therefore, the height L3 from the upper end 46a to the lower end 46b of the flange portion 42 of the filter 40 whose position has been adjusted is shorter than the height L2 of the inner diameter of the drain pipe 60, which reduces resistance when inserting the filter, making it easier to install the filter into the drain pipe.

[0101] Furthermore, as described above, by fixing the connection part 30 by the posture fixing process, the filter 40 can be inserted into the drain pipe 60 while maintaining a constant posture, making it even easier to attach the filter 40 to the drain pipe 60.

[0102] Furthermore, as described above, in the clamping process, the hooking portions 11a and 11b of the clamping portion 10 are hooked onto the small holes 44 of the filter 40, so that the filter 40 can be hooked and clamped, thereby enabling the filter 40 to be stably attached to the drain pipe 60.

[0103] In addition, as described above, the clamping device 1 used in this type of filter installation method is configured so that the elongated members 3a, 3b can be moved relative to each other in the longitudinal direction while clamping the filter 40, making it easy to adjust the position of the filter 40 while it is clamped, resulting in excellent operability.

[0104] Furthermore, as described above, the clamping device 1 has a long hole 31 formed in the elongated member 3a, and the long members 3a and 3b are overlapped and fastened together with a fastener 35, so that one elongated member 3b can be moved longitudinally relative to the other elongated member 3a by the length of the long hole 31, making it easy to adjust the posture of the filter 40.

[0105] Furthermore, as described above, the fastener 35 of the clamping device 1 is capable of moving freely between the first position 32 and the second position 33 of the long hole 31, and can be fixed between the first position 32 and the second position 33 by the fastener 35, so that the other elongated member 3b can be freely moved and fixed relative to one elongated member 3a between the first position 32 and the second position 33 of the long hole 31, making it even easier to adjust the posture of the filter 40.

[0106] Furthermore, as described above, the clamping device 1 is easy to use because the fastener 35 is composed of the bolt 36 and the nut 37, and therefore the movable state of the elongated members 3a, 3b relative to each other can be easily changed between a fixed state and a fixed state depending on the degree of tightening of the bolt 36 and the nut 37.

[0107] Furthermore, as described above, clamping tool 1 has hooking portions 11a and 11b on clamping portion 10, which enables filter 40 to be clamped while being hooked, thereby enabling reliable clamping of filter 40. Furthermore, because hooking portions 11a and 11b have a hook shape, the hooked filter 40 is less likely to come off, and the hooked state of filter 40 is therefore stable.

[0108] Furthermore, as described above, clamping device 1 has movement-preventing portions 12a and 12b in clamping portion 10, which prevents filter 40 from moving toward connection portion 30, thereby stably clamping filter 40. Furthermore, movement-preventing portions 12a and 12b have a mountain-like shape that protrudes inward, which reliably prevents filter 40 from moving toward connection portion 30, thereby making the clamping state of filter 40 even more stable.

[0109] Furthermore, by attaching the filter 40 to the drainage pipe 60 that does not have a drainage filter attached in advance, it becomes possible to prevent the outflow of soil and sand 52. This prevents the formation of gaps at the back of the drainage pipe 60, reduces the risk of the retaining wall 50 collapsing, and improves disaster prevention capabilities.

[0110] Next, a filter replacement method for replacing an existing filter using the clamping tool 1 will be described.

[0111] FIG. 12 is a schematic view showing a first clamping step of clamping the filter with a clamping tool in the filter replacement method according to the second embodiment of the present invention.

[0112] The structures of the clamping tool 1, filters 80, 90, retaining wall 50, and drainage pipe 60 in this second embodiment are basically the same as those in the first embodiment, so the following description will focus on the differences.

[0113] Referring to Figure 12, in this second embodiment, a filter 80 having a structure similar to that of the filter 40 of the first embodiment, which was attached to a drainage pipe 60 provided on a retaining wall 50, is used to replace the filter 80.

[0114] First, the first clamping step in the filter replacement method will be described.

[0115] 12 and again with reference to FIG. 6, first, gripping portion 20 of clamping tool 1 is operated in the opening direction to slightly open elongated members 3a, 3b. Next, hooking portion 11a of clamping portion 10 is hooked onto any one of small holes 84 of filter 80, and similarly, hooking portion 11b is hooked onto any other of small holes 84. Next, gripping portion 20 is operated in the closing direction to move elongated members 3a, 3b toward each other in the closing direction, thereby sandwiching filter 80, thereby completing the first clamping step.

[0116] Furthermore, as explained in Figures 1 and 2, the clamping device 1 is provided with movement prevention portions 12a, 12b on the clamping portion 10, so that the insertion of the clamping portion 10 into the inside of the filter 80 is prevented by the movement prevention portions 12a, 12b, and it is possible to prevent the filter main body 88 from falling off from the frame body 81 of the filter 80 due to excessive insertion of the hook portions 11a, 11b.

[0117] Next, the first attitude adjusting step and the first attitude fixing step in the filter replacement method will be described.

[0118] FIG. 13 is a schematic diagram showing a first attitude adjusting step and a first attitude fixing step for adjusting the attitude of the filter clamped in FIG. 12 so that it is inclined relative to the length direction of the drain pipe.

[0119] 13 and again referring to FIG. 3, with the filter 80 clamped, the fastener 35 of the connection portion 30 of the clamping tool 1 is moved from the first position 32 of the elongated hole 31 of the elongated member 3a to the second position 33, thereby moving the elongated members 3a and 3b relative to each other in the longitudinal direction. Accordingly, the filter 80 is tilted at a predetermined angle relative to the longitudinal direction of the drain pipe 60 while pushing aside the soil 52. While this tilt angle is not particularly limited, it is preferable to tilt the filter 80 by approximately 30° (approximately 60° relative to the longitudinal direction of the drain pipe 60) from a state in which the filter 80 is aligned with the rear end 62 of the drain pipe 60. Adjusting the position of the filter 80 in this manner completes the first position adjustment step.

[0120] Next, when the fasteners 35 are tightened to fix the connection portion 30, the entire elongated members 3a and 3b are also fixed. This maintains the position of the filter 40 adjusted in the first position adjustment step. Fixing the position of the filter 40 in this manner completes the second position fixing step.

[0121] When this filter 80 is tilted, the length L4 in the height direction from the upper end 86a to the lower end 86b of the flange portion 82 of the frame body 81 of the filter 80 (in Figure 13, the direction perpendicular to the pulling-out direction of the filter 80) is shorter than the length L2 in the height direction of the inner diameter of the drain pipe 60.

[0122] Next, the removal step in the filter replacement method will be described.

[0123] Figure 14 is a schematic diagram showing the intermediate state of the extraction process in which the filter whose position has been adjusted in Figure 13 is extracted from the drain pipe, and Figure 15 is a schematic diagram showing the completed state of the extraction process in which the filter extracted in Figure 14 has been completely extracted from the drain pipe.

[0124] Referring to FIG. 14 , the clamping device 1 with the connecting portion 30 fixed thereto is pulled out from the rear side of the drain pipe 60 toward the front side, and the filter 80 with its position adjusted is pulled out from the rear side of the drain pipe 60 toward the front side. Because the filter 80 has a structure similar to that of the filter 40 of the first embodiment, the diameter of the flange portion 82 of the filter 80 is slightly larger than the inner diameter of the drain pipe 60. Therefore, in the depth direction of the filter 80 (the direction penetrating the paper in FIG. 14 ), depth direction ends 87a, 87b, which are part of the flange portion 82, are pressed against the inner surface of the drain pipe 60. Meanwhile, the height direction length L4 from the upper end 86a to the lower end 86b of the flange portion 82 of the filter 80 is shorter than the height direction length L2 of the inner diameter of the drain pipe 60. Therefore, the flange portion 42 of the filter 80 is separated from the inner surface of the drain pipe 60 in the height direction. Therefore, resistance to the drain pipe 60 when the filter 80 is pulled out can be reduced.

[0125] 15, the removal process is completed when the filter 80 has been removed beyond the front end 61 of the drain pipe 60. The removed filter 80 is then removed from the clamping tool 1.

[0126] Next, the second clamping step in the filter replacement method will be described. Referring again to Figure 8, this second clamping step corresponds to the clamping step in the filter installation method in the first embodiment, and involves inserting a new filter 90 having the same structure as filter 40 in the first embodiment using clamping tool 1, in the same manner as in the first embodiment.

[0127] Next, the second attitude adjusting step and the second attitude fixing step in the filter replacement method will be described. Referring again to Figure 9, this second attitude adjusting step corresponds to the attitude adjusting step in the filter attachment method in the first embodiment, and in the same manner as in the first embodiment, the attitude of filter 90 is adjusted by relatively moving elongated members 3a and 3b of clamping tool 1 in the longitudinal direction while filter 90 is clamped.

[0128] Furthermore, the subsequent second posture fixing process corresponds to the posture fixing process of the filter mounting method in the first embodiment, and fixes the posture of the filter 90 by fixing the connection part 30 of the clamping device 1 in the same manner as described in the first embodiment.

[0129] When this filter 80 is tilted, as in the first embodiment, the height length L3 from the upper end 86a to the lower end 86b of the flange portion 82 of the frame body 81 of the filter 80 is shorter than the height length L2 of the inner diameter of the drain pipe 60.

[0130] Next, the insertion step in the filter replacement method will be described. Referring again to Figure 10, this insertion step corresponds to the insertion step in the filter installation method in the first embodiment, and in the same manner as described in the first embodiment, the filter 90, whose position has been adjusted, is inserted from the front side to the back side of the drain pipe 60 until the filter 90 passes the back end 62 of the drain pipe 60.

[0131] In this case, as in the first embodiment, the diameter of the flange portion 92 of the frame 91 of the filter 90 is slightly larger than the inner diameter of the drain pipe 60, so that in the depth direction of the filter 90 (the direction penetrating the plane of the paper in FIG. 10 ), depth direction ends 97a, 97b, which are part of the flange portion 92, are pressed against the inner surface of the drain pipe 60. On the other hand, the height direction length L3 from the upper end 96a to the lower end 96b of the flange portion 92 of the filter 90 is shorter than the height direction length L2 of the inner diameter of the drain pipe 60, so that the flange portion 92 of the filter 90 is separated from the inner surface of the drain pipe 60. This reduces the resistance to the drain pipe 60 when the filter 90 is inserted.

[0132] Next, the fitting step in the filter replacement method will be described. Referring to Figure 11, this fitting step corresponds to the fitting step in the filter installation method in the first embodiment, and involves relatively moving the elongated members 3a, 3b of the clamping tool 1 in the same manner as in the first embodiment, adjusting the position of the filter 90 so that it abuts against the rear end 62 of the drain pipe 60, and then fitting the filter 90 so that the flange 92 of the filter abuts against the rear end 62 of the drain pipe 60.

[0133] As described above, in this filter replacement method, the first posture adjustment process and the second posture adjustment process make the height length from the upper end 86a, 96a to the lower end 86b, 96b of the flange portions 82, 92 of the posture-adjusted filters 80, 90 shorter than the height length of the inner diameter of the drain pipe 60, reducing resistance when pulling out and inserting the filters 80, 90, making it easier to replace the filters 80, 90 in the drain pipe 60.

[0134] Furthermore, the first attitude fixing step allows the filter 80 to be pulled out of the drain pipe 60 while maintaining a fixed attitude, making it even easier to replace the filters 80, 90 on the drain pipe 60.

[0135] Furthermore, the second attitude fixing step allows the filter 90 to be inserted into the drain pipe 60 while maintaining a fixed attitude, making it even easier to replace the filters 80, 90 in the drain pipe 60.

[0136] Furthermore, by inserting the hooking portions 11a, 11b of the clamping tool 1 into the small holes 84, 94 of the filters 80, 90 and clamping them, the filters 80, 90 can be hooked and clamped, making it possible to stably replace the filters 80, 90 with respect to the drain pipe 60.

[0137] Furthermore, since the filter 80 for the drain pipe 60 can be replaced with the filter 90 before it deteriorates significantly, it is possible to semi-permanently prevent the outflow of soil and sand 52. This prevents the formation of voids on the far side of the drain pipe 60, which reduces the risk of the retaining wall 50 collapsing and improves disaster prevention capabilities.

[0138] Figure 16 is a schematic front view of a clamping device according to a third embodiment of the present invention, Figure 17 is a schematic rear view of the clamping device shown in Figure 16, Figure 18 is a schematic view showing a state in which a pair of elongated members of the clamping device shown in Figure 16 have been moved relative to each other in the longitudinal direction, and Figure 19 is a schematic view showing a state in which the clamping device shown in Figure 16 has been opened.

[0139] The clamping tool 101 according to the third embodiment has a configuration basically similar to that of the clamping tool 1 according to the first embodiment, and therefore the differences will be mainly described here.

[0140] 16 to 19, clamping portion 110 and gripping portion 120 of a pair of elongated members 103a, 103b of clamping tool 101 have the same configuration as clamping portion 10 and gripping portion 20 of clamping tool 1 of the first embodiment. Similar to clamping tool 1 of the first embodiment, connecting portion 130 of clamping tool 101 pivotally supports and connects elongated members 103a, 103b to each other so that they can be opened and closed relative to each other.

[0141] Furthermore, the elongated member 103a, which is one of the elongated members 103a and 103b, is provided with a first elongated hole 131, and the other elongated member 103b, which is the other of the elongated members 103a and 103b, is provided with a second elongated hole 141 having a shape similar to that of the first elongated hole 131 at a position overlapping the first elongated hole 131. Then, with the elongated members 103a and 103b overlapping each other, they are fastened together by a fastener 135 that passes through the first elongated hole 131 of the elongated member 103a and the second elongated hole 141 of the elongated member 103b. In the third embodiment, the fastener 135 is composed of a bolt 136 and a nut 137. The bolt 136 passes through the first elongated hole 131 and the second elongated hole 141 of the elongated member 103b from the front side (surface side) of the elongated member 103a, and the nut 137 is fitted onto the bolt 136 from the rear side (back side) of the elongated member 103b. Because the shaft of the bolt 136 passes through the first elongated hole 131 and the second elongated hole 141, when the nut 137 is loosened, the bolt 136 is movable within the first elongated hole 131 between a first position 132, which is the end of the first elongated hole 131 on the clamping portion 110 side, and a second position 133, which is the end of the first elongated hole 131 on the gripping portion 120 side, as shown in FIGS. 16 and 18 . Furthermore, because the first elongated hole 131 and the second elongated hole 141 overlap each other, the bolt 136 is movable within the second elongated hole 141 between a first position 142, which is the end of the second elongated hole 141 on the clamping portion 110 side, and a second position 143, which is the end of the second elongated hole 141 on the gripping portion 120 side. Additionally, by tightening the nut 137, the connection portion 30 can be fixed at any position between the first positions 132, 142 and the second positions 133, 143, and the elongated members 103a, 103b can be fixed as a whole.

[0142] Similar to the clamping tool 1 of the first embodiment, this relative movement of the elongated members 103a, 103b in the longitudinal direction is possible not only when the elongated members 103a, 103b are in the closed state but also when they are in the open state, thereby enabling the elongated members 103a, 103b to move relatively in the longitudinal direction while clamping the filter as the object.

[0143] Using such a clamping tool 101, the filter mounting method of the first embodiment and the filter replacement method of the second embodiment can be carried out.

[0144] As described above, such a clamping device 101 has a first elongated hole 131 provided in the elongated member 103a and a second elongated hole 141 provided in the elongated member 103b, so that one elongated member 103a and the other elongated member 103b can be moved relative to each other in the longitudinal direction by the lengths of the first elongated hole 131 and the second elongated hole 141, making it easy to fine-tune the position of the filter.

[0145] Furthermore, since the fastener 135 can be freely moved between the first positions 132, 142 and the second positions 133, 143 of the first long hole 131 and the second long hole 141, and can be fixed between the first positions 132, 142 and the second positions 133, 143 by the fastener 135, one elongated member 103a and the other elongated member 103b can be freely moved and fixed between the first positions 132, 142 and the second positions 133, 143 of the first long hole 131 and the second long hole 141, making it even easier to fine-tune the attitude of the filter.

[0146] Furthermore, as described above, the fastener 135 of the clamping device 101 is composed of the bolt 136 and the nut 137, and therefore the movable state and fixed state of the elongated members 103a, 103b can be easily changed depending on the degree of tightening of the bolt 136 and the nut 137, making the clamping device easy to use.

[0147] Figure 20 is a schematic diagram showing the bottom of a filter dish according to other embodiments, (1) is the fourth embodiment, (2) is the fifth embodiment, and (3) is the sixth embodiment.

[0148] The filters 150, 160, and 170 according to the fourth to sixth embodiments have basically the same configuration as the filter 40 according to the first embodiment, so the following description will focus on the differences.

[0149] 5(1), filter 150 of the fourth embodiment has a plurality of small holes 154 that are larger than those of the first embodiment provided in dish bottom portion 153 of frame body 151. This makes it easier to insert hook portions 11a, 11b of clamping tool 1 described in the first embodiment. In addition, filter 150 itself is less likely to clog.

[0150] 5(2), a filter 160 of the fifth embodiment has a plurality of small holes 164 that are smaller than those of the first embodiment provided in a dish bottom 163 of a frame body 161. This further reduces the risk of soil and sand leaking out from the drainage pipe. In this case, the hook portions 11a and 11b of the clamping tool 1 described in the first embodiment may be made thinner to fit the small holes 164.

[0151] 5(3), a filter 170 of the sixth embodiment has a dish bottom 173 of a frame 171 provided with a plurality of small holes 174 similar to those of the fourth embodiment, and also has an X-shaped closing portion 175. This makes it possible to reduce the risk of soil and sand flowing out of the drainage pipe while maintaining ease of insertion of the hook portions 11a and 11b of the clamping tool 1.

[0152] The filters 150, 160, 170 according to the fourth to sixth embodiments can be clamped not only by the clamping tool 1 of the first embodiment but also by the clamping tool 101 of the second embodiment.

[0153] In the above embodiments, the clamping tool is formed by punching steel plate, but the material and manufacturing method are not limited to this. It may be made of wood or resin, or may be formed by casting.

[0154] In addition, in each of the above embodiments, the length of the clamping tool is not limited, and may be long enough so that the clamping portion reaches the inner end of the drain pipe when the user pushes their arm into it. For ease of operation, it is preferable that the clamping portion is longer than the drain pipe on which the filter is to be installed or replaced, and it is even more preferable that the clamping portion is long enough to extend outside the drain pipe.

[0155] Furthermore, in each of the above embodiments, the clamping portion has a specific shape, but this is not limiting, and other shapes, such as uneven anti-slip portions, may also be used.

[0156] Furthermore, in each of the above embodiments, the clamping portion has a hook portion, but the hook portion may be omitted.

[0157] Furthermore, in each of the above embodiments, the hook portion has a hook shape, but this is not limiting and other shapes such as a T-shape may also be used.

[0158] Furthermore, in each of the above embodiments, the clamping portion has a movement preventing portion, but the movement preventing portion may be omitted.

[0159] Furthermore, in each of the above embodiments, the movement-preventing portions have a mountain-like shape facing inward, but this is not limited to this. They may also be shaped to face in other directions, such as facing outward or in a kamaboko shape.

[0160] Furthermore, in each of the above embodiments, the grip portion has a specific shape, but is not limited to this. It may have other shapes, such as a thick rod shape without an opening and a grip wrapped around it to make it easier to hold.

[0161] Furthermore, in each of the above embodiments, the connecting portion has a specific shape, but is not limited to this, and may have any other configuration as long as it supports the elongated members so as to be able to open and close freely and allows the elongated members to move relative to each other in the longitudinal direction while holding an object.

[0162] Furthermore, in each of the above embodiments, the fastening portion is configured by a bolt and a nut, but it is not limited to this and may be other.

[0163] Furthermore, in each of the above embodiments, the filter has a specific structure, but is not limited to this. As long as it is attached to the drain pipe, it may have a conical shape, or it may have legs to prevent the filter from falling off inside the drain pipe, or it may have a frame with a lid with holes that covers the filter body to prevent the filter body from falling off, or other shapes.

[0164] Furthermore, in each of the above embodiments, the filter has a configuration in which the filter body is attached within the frame, but this is not limited to this. The filter frame may have small holes formed therein to provide the same function as the filter body, thereby eliminating the need for a filter body.

[0165] Furthermore, in each of the above embodiments, the flange portion of the filter is flexible, but this is not limited to this. Any flange that can be inserted into the drain pipe by reducing its diameter or the like and attached to the pipe may be used.

[0166] Furthermore, in the above-described embodiments, the material of the filter frame is not particularly limited, and any material may be used as long as it does not deteriorate in the soil.

[0167] Furthermore, in each of the above embodiments, the filter body is made of nonwoven fabric, but this is not limiting, and it may be made of resin such as a frame body with a plurality of holes formed therein.

[0168] Furthermore, in each of the above embodiments, the object is a filter for a drain pipe, but the object is not limited to this and may be anything that can be clamped by the clamping tool.

[0169] Furthermore, in the first embodiment, the clamping step is performed before the attitude adjusting step, but this is not limited to this. The filter may be clamped in the clamping step after the elongated members of the clamping tool are moved relative to each other in the attitude adjusting step.

[0170] Furthermore, in the second embodiment described above, the second clamping step is performed before the second attitude adjusting step, but this is not limited to this. The filter may be clamped in the second clamping step after the elongated members of the clamping tool are moved relative to each other in the second attitude adjusting step.

[0171] Furthermore, although the first embodiment described above includes the attitude fixing step, the attitude fixing step may be omitted. In that case, the clamping tool may be operated so as to maintain the attitude of the filter adjusted in the attitude adjusting step.

[0172] Furthermore, although the first and second attitude fixing steps are included in the first embodiment, the first and second attitude fixing steps may be omitted. In this case, the clamping tool may be operated so as to maintain the attitude of the filter adjusted in the first and second attitude adjusting steps.

[0173] Furthermore, in the first and second embodiments described above, the filter may be clamped in a state in which its diameter is reduced as in the prior art.

[0174] Furthermore, in the first and second embodiments described above, the retaining wall may be an existing one or a new one.

[0175] Furthermore, in the first and second embodiments, the masonry retaining wall exemplified as the retaining wall may be a wet masonry wall using mortar, concrete, or the like as an adhesive or fixing material, or may be a dry masonry wall. Also, instead of a masonry retaining wall, it may be a concrete retaining wall.

[0176] Furthermore, in the first and second embodiments, the retaining wall is made of piled stones and the area behind the drainage pipe is directly filled with soil 52 or the like as a permeable layer, but a reinforcing mortar layer may be provided between the stones and the soil. Also, mortar may be filled between the stones and the soil when replacing the filter. [Explanation of symbols]

[0177] 1, 101...Pinching tool 3a, 3b, 103a, 103b...Long member 10, 110...gripping part 11a, 11b...Hook 12a, 12b...Movement prevention part 20, 120...gripping part 21a, 21b...opening 30, 130...Connection 31…Long hole 32, 132, 142...1st position 33, 133, 143...second position 35, 135... Fasteners 36, 136...volts 37, 137...Nat 40, 80, 90, 150, 160, 171... Filters 41, 81, 91, 151, 161, 171...Frame 42, 82, 92...Flange section 43, 83, 93, 153, 163, 173...bottom of plate 44, 84, 94, 154, 164, 174...Small hole 48, 88...Filter body 50...Retaining wall 60...Drain pipe 61...Front end of drain pipe 62...Back end of drain pipe 131...First slot 141...Second slot In addition, the same reference numerals in each drawing indicate the same or corresponding parts.

Claims

1. A clamping tool consisting of a pair of elongated members for clamping an object, a clamping portion provided at one end of the pair of elongated members in the longitudinal direction and configured to clamp the object; a gripping portion provided at the other end of the pair of elongated members in the longitudinal direction and configured to be grippable; a connecting portion between the clamping portion and the gripping portion, which pivotally connects the elongated members so that the elongated members can be opened and closed relative to each other; A clamping tool configured such that the elongated members are relatively movable in the longitudinal direction while clamping the object.

2. The clamping tool according to claim 1, wherein the connection portion has a long hole formed in one of the elongated members, and is fastened by a fastener that passes through the long hole and the other of the elongated members when the one and the other of the elongated members are overlapped.

3. 3. The clamping tool according to claim 2, wherein the connecting portion is movable between a first position, which is the clamping portion side end of the elongated hole, and a second position, which is the gripping portion side end of the elongated hole, and can be fixed between the first position and the second position by the fastener.

4. The clamping tool according to claim 2 or 3, wherein the fastener is composed of a bolt and a nut, the bolt passes through the elongated hole and the other side of the elongated member, and the nut engages with the bolt from the back side of the other side of the elongated member.

5. 2. The clamping tool according to claim 1, wherein the connecting portion has a first elongated hole formed in one of the elongated members and a second elongated hole similar to the first elongated hole formed in the other of the elongated members, and the first elongated hole and the second elongated hole are fastened together by a fastener passing through the first elongated hole and the second elongated hole while the first elongated hole and the second elongated hole are overlapped.

6. 6. The clamping tool according to claim 5, wherein the connecting portion is movable between a first position, which is the clamping portion side end of the first elongated hole and the second elongated hole, and a second position, which is the gripping portion side end of the first elongated hole and the second elongated hole, and can be fixed between the first position and the second position by the fastener.

7. 7. The clamping tool according to claim 5 or 6, wherein the fastener is composed of a bolt and a nut, the bolt passes through the first elongated hole and the second elongated hole, and the nut fits onto the bolt from a back side of the second elongated hole.

8. The clamping tool according to claim 1 , wherein the clamping portion has a hook portion at a tip thereof that can hook the object.

9. The clamping tool according to claim 8 , wherein the hook portions have a hook shape facing inward.

10. 10. The clamping tool according to claim 8, wherein the clamping portion has a movement preventing portion that is provided closer to the connecting portion than the hooking portion and that prevents the object from moving toward the connecting portion.

11. The clamping tool according to claim 10 , wherein the movement preventing portions have a mountain-like shape that protrudes inward toward each other.

12. The clamping tool according to claim 1 , wherein the gripping portion has a ring-shaped opening.

13. A filter mounting method for mounting a filter, which comprises a disk-shaped frame having a flexible flange portion at its periphery, and a filter body attached to the frame, to a cylindrical drain pipe embedded in a retaining wall, comprising: a clamping step of clamping the frame of the filter with the clamping tool according to claim 1; an attitude adjustment step of adjusting the attitude of the filter so that it is inclined with respect to the length direction of the drain pipe by relatively moving the elongated members of the clamping tool in the longitudinal direction; an insertion step of inserting the filter whose position has been adjusted from the front side to the back side of the drain pipe by inserting the clamping tool into the drain pipe; and an inserting step of adjusting the inserted filter so that it abuts against the rear end of the drain pipe, fitting it into the rear end, and then releasing the clamped state.

14. The filter mounting method according to claim 13, further comprising, after the attitude adjusting step, a position fixing step of fixing the connection portion to fix the position of the filter whose position has been adjusted.

15. A number of small holes are formed in the bottom of the dish of the frame of the filter, 14. The filter mounting method of claim 13, wherein in the clamping process, one of the clamping portions of the clamping tool is hooked onto one of the small holes, the other of the clamping portions of the clamping tool is hooked onto the other of the small holes, and the elongated members are moved in a closing direction to clamp the filter.

16. A filter replacement method for replacing a filter that is attached to a cylindrical drainage pipe embedded in a retaining wall, and that has a filter body attached to a circular dish-shaped frame having a flexible flange portion on its periphery, comprising: a first clamping step of clamping the frame of the filter by inserting the clamping tool according to claim 1 into the drain pipe; a first attitude adjustment step of adjusting the attitude of the clamped filter so that it is inclined with respect to the length direction of the drain pipe by relatively moving the elongated members of the clamping tool in the longitudinal direction; a pulling-out process of pulling out the filter whose position has been adjusted from the rear side of the drain pipe to the front side thereof by pulling out the clamping tool from the drain pipe; a second clamping step of clamping a frame of a new filter with the clamping tool; a second attitude adjustment step of adjusting the attitude of the new filter so that it is inclined with respect to the length direction of the drain pipe by relatively moving the elongated members of the clamping tool in the longitudinal direction; an insertion step of inserting the new filter whose position has been adjusted from the front side to the back side of the drain pipe by inserting the clamping tool into the drain pipe; a fitting step of adjusting the inserted new filter so that it abuts against the rear end of the drain pipe, fitting it into the rear end, and then releasing the clamped state.

17. The filter replacement method according to claim 16, further comprising, after the first attitude adjusting step, a first attitude fixing step of fixing the connection portion to fix the attitude of the filter whose attitude has been adjusted.

18. 18. The filter replacement method according to claim 16 or 17, further comprising a second attitude fixing step of fixing the attitude of the new filter whose attitude has been adjusted by fixing the connection portion after the second attitude adjustment step.

19. A number of small holes are formed in the bottom of the dish of the frame of the filter, 17. The filter replacement method of claim 16, wherein in the first clamping step and the second clamping step, one of the clamping portions of the clamping tool is hooked onto one of the small holes, the other of the clamping portions of the clamping tool is hooked onto the other of the small holes, and the elongated members are moved in a closing direction to clamp the filter.

Images