Stake-setting device, and stake-setting method

Abstract

To improve efficiency of stake-setting work.SOLUTION: A stake-setting device configured to be removably attached to a stake and to hold one end of a leveling string comprises: a mounting member that can be attached to the stake at any height position; a plate-shaped member that has a support surface at which the leveling string is positioned and that is supported so as to be rotatable with respect to the mounting member; and a fixing member that fixes the plate-shaped member to the mounting member so as not to be rotatable. The plate-shaped member has a rotation axis with respect to the mounting member disposed at the center in its width direction, so that the support surface becomes horizontal when the plate-shaped member rotates under its own weight and becomes balanced with respect to the mounting member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tensioning device and tensioning method for tensioning a water line. [Background technology]

[0002] When carrying out construction work, it is necessary to perform stake setting work to determine the horizontal height of a building and to determine the position of columns and walls. Conventional stake setting work involves nailing a cross plate to a wooden stake, and then stretching a water line through the cross plate to determine its position. However, this method makes it difficult to dismantle the stake setting work, and the stakes and cross plate cannot be reused. In addition, this method requires nailing the cross plate to the wooden stake while adjusting its height and horizontal position, which makes the work time-consuming.

[0003] Patent Document 1 discloses a mounting fixture that is detachably attached to a wooden stake and has a plurality of thread hooks to which one end of a water line is attached. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Registered Utility Model No. 3153228 Summary of the Invention [Problem to be solved by the invention]

[0005] The fixture of Patent Document 1 allows for stake-setting work without using nails. However, this fixture requires that the angle be precisely adjusted to level the work before the water line is set. This leveling work requires the angle of the fixture to be precisely read and adjusted using a level, which is time-consuming. For this reason, even with the use of this fixture, the effect of improving the efficiency of stake-setting work is limited, and further improvements in work efficiency are desired.

[0006] The present invention has been made in consideration of the above-mentioned problems with the conventional technology, and has an object to provide a stake-setting device and a stake-setting method that can improve the efficiency of stake-setting work. [Means for solving the problem]

[0007] The first aspect of the present invention is a stake-setting device that is detachably attached to a stake and is used to hold one end of a water line, and comprises a mounting member that can be attached to the stake at any height, a plate-shaped member that has a support surface on which the water line is positioned and is supported so that it can rotate freely on the mounting member, and a fixing member that fixes the plate-shaped member so that it cannot rotate on the mounting member, and the plate-shaped member has a rotation axis for the mounting member located at the center of its width, so that the support surface becomes horizontal when the plate-shaped member rotates under its own weight and becomes balanced relative to the mounting member.

[0008] A second aspect of the present invention is a stake-setting method that uses at least one pair of stake-setting devices that are detachably attached to piles and hold one end of a water line, and that includes the steps of attaching mounting members provided on each stake-setting device to any height position of the pair of piles, rotating a plate-shaped member that is supported freely rotatably on the mounting members until it is balanced by its own weight, thereby setting the support surface provided on the plate-shaped member of each stake-setting device horizontal, fixing the plate-shaped member with the support surface set horizontally to the mounting members so that it cannot rotate, and holding each end of the water line against the support surface of each stake-setting device whose plate-shaped member is fixed non-rotatably to the mounting members, thereby stretching the water line between the pair of stake-setting devices. Effect of the Invention

[0009] According to the above aspect of the present invention, the efficiency of stake-out work can be improved. [Brief description of the drawings]

[0010] [Figure 1]1 is a perspective view of a tensioning device according to an embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] 4 is a flowchart showing a procedure of a tensioning method using the tensioning device. [Figure 7A] FIG. 4 is a side view showing the state in which the mounting member is inserted into the pile. [Figure 7B] 7B is a front view showing a state in which the mounting member shown in FIG. 7A is adjusted to an arbitrary height position and the plate-shaped member is set horizontally by its own weight. FIG. [Figure 7C] 7C is a front view showing a state in which the water line is held by the tensioning device shown in FIG. 7B. [Figure 8] 1 is a plan view showing a schematic diagram of the state in which the carport posts have been positioned using a stake-out device. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a stake setting device and a stake setting method according to the present invention will be described in detail below with reference to the accompanying drawings.

[0012] As shown in Fig. 1, the stake-setting device 10 of this embodiment is a tool used for stake-setting work to determine the horizontal height of a building and the position of columns and walls. Examples of buildings for which stake-setting is performed using the stake-setting device 10 include exterior products such as gate sleeves, carports, car gates, wood decks, and rewood decks, as well as various buildings such as stores and houses.

[0013] The stake setting device 10 is attached to a stake 12 that is driven into the ground and stands upright, and holds one end of a tension line 14. The stake 12 is, for example, a square wooden stake. The tension line 14 is, for example, a nylon thread.

[0014] As shown in Figures 1 to 5, the stake tensioner 10 has a mounting member 16, a plate-like member 18, and a fixing member 20. In the following, the stake tensioner 10 and its components will be described by referring to the front side as the front, the back side as the back, the top as the top, the bottom as the bottom, the left side as the left, and the right side as the right, as viewed from the front of the plate-like member 18. In each figure, the left-right direction is indicated by an arrow X, the up-down direction is indicated by an arrow Y, and the front-rear direction is indicated by an arrow Z.

[0015] The mounting member 16 can be detachably attached to the pile 12. The mounting member 16 has a cylindrical body 22, a mounting screw 23, a shaft 24, and a boss 25.

[0016] The cylindrical body 22 is made of a metal such as stainless steel or steel, and is a tube through which the pile 12 is inserted. It has a shape that allows the pile 12 to be inserted without rattling. In this embodiment, the pile 12 is square, so the cylindrical body 22 is also a square tube. The cylindrical body 22 allows the pile 12 to be inserted so as to be movable relatively along the up-down direction with respect to the hole portion 22a on the inner periphery. This allows the cylindrical body 22 to function as a slider that can move relative to the pile 12 in the up-down direction (Y direction), which is its longitudinal direction.

[0017] The mounting screws 23 are knob screws that can be easily tightened by hand, for example. The mounting screws 23 are used in pairs, for example, upper and lower. A pair of upper and lower weld nuts 26 are fixed to the rear wall 22b of the cylindrical body 22. Through holes 22c are formed in the rear wall 22b coaxially with the weld nuts 26. The mounting screws 23 are screwed into the weld nuts 26, respectively, and their tips are inserted into the through holes 22c. The mounting screws 23 can press the outer surface of the pile 12 inserted into the cylindrical body 22 with their tips. This allows the mounting member 16 to be positioned and fixed to the pile 12 at any height position. In other words, the stake setting device 10 can be adjusted and fixed to any height position with respect to the pile 12 using the mounting members 16.

[0018] The shaft 24 is a cylindrical metal rod. The shaft 24 is, for example, a bar screw with a male thread formed on the outer circumferential surface. A weld nut 27 is fixed to the front wall 22d of the cylindrical body 22 at approximately the center in the vertical and horizontal directions. The shaft 24 is installed so that one end is screwed into the weld nut 27 and protrudes forward in the Z direction from the front wall 22d. The shaft 24 may be formed of a simple metal rod without a male thread and fixed to the front wall 22d by welding. The shaft 24 serves as the rotation axis of the plate-like member 18.

[0019] The boss 25 is a cylinder having an axially extending screw hole formed on its inner circumference. The boss 25 is, for example, a long nut (tall nut). A pair of bosses 25 are provided on the left and right sides, for example, straddling the shaft 24. One end of the boss 25 is welded to the front wall 22d of the cylinder 22, and the boss 25 is installed so as to protrude forward in the Z direction from the front wall 22d. The axial length of the boss 25 is shorter than the axial length of the shaft 24 (see FIG. 4).

[0020] The plate-like member 18 is for positioning and holding the water line 14. The plate-like member 18 is a metal plate formed by bending a thin metal plate made of, for example, stainless steel or steel into a substantially L-shape. The plate-like member 18 has a plate portion 30 and a bent plate portion 31.

[0021] The plate portion 30 is a rectangular plate disposed along the vertical direction (YX direction). The plate portion 30 is formed with a support surface 30a, a shaft hole 30b, and a fixing hole 30c.

[0022] The support surface 30a is formed by the upper end surface of the plate portion 30, and is located at the upper end of the plate-like member 18. The support surface 30a is a surface for positioning and supporting the water line 14 at a desired height position and a desired horizontal position.

[0023] The shaft hole 30b is a through hole having an inner diameter that allows the shaft 24 of the mounting member 16 to be inserted without rattle. The shaft hole 30b serves as a bearing that supports the shaft 24 so that it can rotate relatively. The shaft hole 30b is located at the center of the plate-shaped member 18 in the left-right width direction (X direction) and slightly above the center of the plate portion 30 in the up-down direction (Y direction).

[0024] As a result, the plate-shaped member 18 is supported so as to be rotatable relative to the mounting member 16 by inserting the shaft 24 through the shaft hole 30b. At this time, the plate-shaped member 18 has the shaft hole 30b at its center in the left-right direction. As a result, the plate-shaped member 18 can rotate and balance under its own weight like a balance scale or a balancing toy with the shaft 24 as the rotation axis (see arrow θ in FIG. 1 and FIG. 5), and when balanced by its own weight, the support surface 30a becomes horizontal. In other words, the support surface 30a is a surface that is set horizontally when the plate-shaped member 18 is supported by the shaft 24 and balanced by its own weight. That is, it can be said that the plate-shaped member 18 has the shaft hole 30b formed at its center of gravity or at a position offset vertically upward from the center of gravity. As a result, the plate-shaped member 18 can rotate under its own weight with the shaft 24 as the rotation axis, and the support surface 30a at the upper end can be automatically set horizontally.

[0025] The folded plate portion 31 is a band-shaped plate formed by folding the lower end of the plate portion 30 forward at a right angle. The folded plate portion 31 is arranged along the horizontal direction (XZ direction). The upper surface of the folded plate portion 31 has a certain dimension in the Z direction and constitutes a mounting surface 31a on which a level 32 can be placed. The level 32 may be a commercially available product, such as a bubble level or a digital level. The mounting surface 31a is parallel to the support surface 30a. In this way, the plate-shaped member 18 can be constructed by simply folding a single sheet of metal, for example, thereby reducing the parts and material costs of the stake-setting device 10.

[0026] The fixing holes 30c are elongated holes extending vertically (see FIG. 5). A pair of fixing holes 30c are provided on the left and right sides straddling the shaft hole 30b so as to correspond to a pair of bosses 25 of the mounting member 16.

[0027] The fixing member 20 is, for example, a thumb screw that can be easily tightened by hand. A pair of fixing members 20 are used, one on the left and one on the right, corresponding to the left and right bosses 25. When the tip surface of each boss 25 is butted against the rear surface of the plate portion 30, the screw hole communicates with the fixing hole 30c. The fixing member 20 is screwed into the screw hole of the boss 25 from the front side of the plate portion 30 through the fixing hole 30c. This allows the fixing member 20 to fix the plate-like member 18 to the mounting member 16 so that it cannot rotate. In other words, the plate-like member 18, whose support surface 30a is set horizontally by its own weight with the shaft 24 as a rotation axis, can be fixed in the horizontal position set by the fixing member 20. Reference numeral 20a in FIG. 4 denotes a washer that is installed, for example, in two layers for each fixing member 20.

[0028] Since the fixing hole 30c is an elongated hole extending vertically, the fixing member 20 can be reliably fixed as long as the plate-shaped member 18 is within a predetermined rotation angle range. The rotation angle range of the plate-shaped member 18 is, for example, 20 degrees with respect to the vertical. This allows the stake setting device 10 to reliably set the support surface 30a horizontally even if the pile 12 is driven into the ground at an angle of 20 degrees or less to the left or right.

[0029] Next, a method for holding one end of the water line 14 using the tensioning device 10 will be described with reference to Figs. 6 to 7C.

[0030] First, in step S1 of Fig. 6, the cylindrical body 22 of the mounting member 16 is inserted into the pile 12 driven into the ground G (see Fig. 7A). At this time, the plate-like member 18 is supported so as to be freely rotatable with respect to the mounting member 16 by inserting the shaft 24 into the axial hole 30b. The fixing member 20 is removed from the boss 25. Alternatively, the fixing member 20 is loosely and temporarily fixed in the screw hole of the boss 25 so as not to interfere with the rotation of the plate-like member 18.

[0031] In step S2, a level marking (marking M1) indicating the height position at which the level line 14 is stretched is formed on the outer surface of the pile 12 (see FIG. 7A). The marking M1 is made using, for example, a laser marker.

[0032] In step S3, the mounting member 16 is moved along the pile 12 (see arrow A in FIG. 7B) to align the height of the support surface 30a with the marking M1 and fixed with the mounting screw 23 (see FIG. 7B).

[0033] In step S4, the stake tensioning device 10 (plate-shaped member 18) is adjusted to be horizontal. The plate-shaped member 18 is rotated by its own weight around the shaft 24 inserted in the shaft hole 30b as the rotation axis (see arrow θ in FIG. 7B) and stopped in a balanced state. As described above, the plate-shaped member 18 has the shaft hole 30b at the center in the width direction and rotates by its own weight like a balance scale or a balancer. Then, when the plate-shaped member 18 is balanced by its own weight, the support surface 30a is set to be horizontal. In this way, the stake tensioning device 10 of this embodiment does not require the operator to actively perform the level adjustment work. In other words, the stake tensioning device 10 completes the level adjustment of the support surface 30a simply by freely rotating the plate-shaped member 18 by its own weight.

[0034] Then, each fixing member 20 is fastened to the screw hole of each boss 25. As a result, the plate-like member 18 is positioned and fixed relative to the mounting member 16, and the adjusted horizontal state is maintained. At this time, in the stake tensioning device 10, the fixing member 20 is provided at a position different from the shaft 24 that serves as the rotation axis. Therefore, when the fixing member 20, which is, for example, a butterfly screw, is fastened to the boss 25, the plate-like member 18 is prevented from being pulled by this fastening action and erroneously rotating by the abutment of the shaft 24 and the shaft hole 30b, and the adjusted horizontal position can be suppressed from being shifted. In particular, in the stake tensioning device 10 of this embodiment, a pair of fixing members 20 is arranged across the shaft 24. Therefore, the plate-like member 18 is further prevented from erroneously rotating when the fixing member 20 is fastened. Furthermore, after the fastening of the fixing member 20, the plate-like member 18 can be further prevented from erroneously rotating when, for example, the water line 14 is hooked on the support surface 30a.

[0035] The order of steps S3 and S4 may be reversed. That is, after the plate-like member 18 is leveled and fixed by the fixing member 20, the stake setting device 10 may be moved along the stake 12 to align with the marking M1.

[0036] In step S4, after the support surface 30a has been adjusted to be level by the weight of the plate-like member 18, a level 32 may be placed on the mounting surface 31a to check whether the level has been adjusted accurately. The level check using the level 32 can be performed simply by placing the level 32 on the mounting surface 31a of the plate-like member 18 that has been leveled by its own weight, so there is almost no workload involved. Since the level check using the level 32 is not essential, the mounting surface 31a, i.e., the folded plate portion 31, may be omitted.

[0037] In step S5, a marking indicating the horizontal position for stretching the water line 14 is formed on the support surface 30a (see arrow M2 in FIG. 7C). The marking M2 is made using, for example, a laser marker.

[0038] Finally, in step S6, one end of the water thread 14 is aligned with the marking M2 and held by the plate-like member 18 (see FIG. 7C). This positions and holds the water thread 14 at a predetermined height and horizontal position. In FIG. 7C, the thickness of the water thread 14 is exaggerated.

[0039] In step S6, the work of holding the water line 14 on the plate-like member 18 is performed, for example, by hooking the water line 14 on the support surface 30a and bending it downward, passing it through the rear surface of the plate portion 30, and then bending it forward and wrapping it around the lower surface of the folded plate portion 31, as shown in FIG. 1. The end of the water line 14 arranged on the lower surface side of the folded plate portion 31 can be clamped and held together with the folded plate portion 31 by a clamp device 34 that straddles the tip surface of the folded plate portion 31. The clamp device 34 clamps the water line 14 on the folded plate portion 31, which improves the workability of the clamping work. The clamp device 34 may be replaced by a clip or the like. Note that there is a gap in the Z direction between the plate portion 30 and the cylindrical body 22, which is the length of the boss 25. Therefore, the water line 14 can also be clamped and held together with the plate portion 30 by the clamp device 34 that straddles the support surface 30a at a position where it is bent from the support surface 30a to the rear surface of the plate portion 30.

[0040] Next, a procedure for a stake-setting method in which the above-mentioned method for holding the water line 14 is applied to the stake-setting device 10 and the water line 14 is set between a pair of posts 12, 12 will be described with reference to FIG.

[0041] Fig. 8 shows a schematic diagram of the state in which the four posts 40 supporting the roof of a carport have been positioned using the stake-setting device 10. First, the installation positions of the four posts 40 are roughly determined from the site boundary B1 and the road boundary B2, and the positions are marked on the ground with a spray or the like. Next, the stakes 12 are driven into positions offset a predetermined distance from the marked installation positions of the posts 40. In the method shown in Fig. 8, eight stakes 12 are installed to set up a total of four water lines 14.

[0042] Next, a stake-setting method is carried out using the stake-setting device 10. This stake-setting method is a method in which the stake-setting device 10 is attached to at least a pair of opposing piles 12, 12, and a water line 14 is stretched between the pair of opposing stake-setting devices 10, 10.

[0043] First, steps S1 to S6 in FIG. 6 are performed on a pair of opposing piles 12. In this case, in the step shown in step S5 in FIG. 6, the position of the waterline 14 indicating the distance from the site boundary B1 or road boundary B2 to the post 40 is marked M2 on the support surface 30a. Then, in the step shown in step S6 in FIG. 6, one end of the waterline 14 is held by one of the opposing stake-setting devices 10, and the other end of the waterline 14 is held by the other stake-setting device 10. As a result, for example, one waterline 14 parallel to the site boundary B1 at a predetermined distance is set between the opposing pair of stake-setting devices 10, 10. If only one waterline 14 needs to be set, the stake-setting method is completed.

[0044] On the other hand, when positioning four posts 40 as shown in Fig. 8, a second water line 14 is then stretched at 90 degrees perpendicular to the previously stretched water line 14. This work can also be done by stretching the water line 14 for a pair of opposing stake tensioning devices 10, 10 in the same manner as above. After that, the remaining water lines 14 can be stretched in order from the two water lines 14 stretched in a cross shape to positions corresponding to the distance between the posts 40, 40.

[0045] In this manner, the stake tensioning device 10 of this embodiment can be detachably attached to the stake 12 and used for stake tensioning work to hold one end of the water line 14. The stake tensioning device 10 includes a mounting member 16 that can be attached to the stake 12 at any height, a plate-like member 18 that has a support surface 30a on which the water line 14 is positioned and is supported rotatably on the mounting member 16, and a fixing member 20 that fixes the plate-like member 18 to the mounting member 16 so that it cannot rotate. The plate-like member 18 has a rotation axis (shaft 24) for the mounting member 16 located at the center in the width direction, so that the support surface 30a becomes horizontal when the plate-like member 18 rotates under its own weight relative to the mounting member 16 and is balanced.

[0046] Therefore, with such a stake tensioning device 10, the stake tensioning device that has been constructed can be easily dismantled, and the stake tensioning device 10 itself and the piles 12 can be reused. In addition, the stake tensioning device 10 supports the center of the width of the plate-like member 18 so that it can rotate freely relative to the shaft 24, which is the rotation axis. Therefore, when the plate-like member 18 rotates under its own weight and balances, the support surface 30a for positioning the water line 14 is automatically adjusted to the horizontal position. As a result, the stake tensioning device 10 does not need to perform precise level adjustment work while checking the level 32, and the efficiency of the stake tensioning work can be improved.

[0047] The stake-setting method of this embodiment uses at least one pair of stake-setting devices 10 that are detachably attached to the stakes 12 and hold one end of the stake-setting device 14, and sets the water line 14 between the pair of stake-setting devices 10. This method can have at least the following steps: Attaching the mounting members 16 provided on each stake-setting device 10 to any height position of the pair of stakes 12; Setting the support surface 30a provided on the plate-like member 18 of each stake-setting device 10 horizontal by rotating the plate-like member 18 supported rotatably on the mounting members 16 until it is balanced by its own weight; Fixing the plate-like member 18 with the support surface 30a set horizontally to the mounting members 16 so as not to rotate; Holding the end of the water line 14 against the support surface 30a of each stake-setting device 10 with the plate-like member 18 fixed to the mounting members 16 so as not to rotate, the water line 14 is set between the pair of stake-setting devices 10.

[0048] Therefore, according to this method of stake setting, the level adjustment of the stake setting device 10 can be performed simply by rotating it under its own weight. Therefore, this method of stake setting does not require precise level adjustment work while checking the level 32, and the efficiency of the stake setting work can be improved.

[0049] As described above, the stake-setting device according to the first aspect of the present invention is a stake-setting device that is detachably attached to a stake and holds one end of a water line, and includes a mounting member that can be attached to the stake at any height, a plate-shaped member that has a support surface on which the water line is positioned and is supported rotatably on the mounting member, and a fixing member that fixes the plate-shaped member to the mounting member so that it cannot rotate. The plate-shaped member has a rotation axis for the mounting member at the center of its width, so that the support surface becomes horizontal when the plate-shaped member rotates under its own weight and balances with respect to the mounting member. With this configuration, when the plate-shaped member rotates under its own weight and balances with respect to the mounting member, the support surface for positioning the water line becomes horizontal. Therefore, the stake-setting device does not need to perform precise level adjustment work while checking a level, and the efficiency of the stake-setting work is improved.

[0050] The support surface may be provided at the upper end of the plate-like member, and a mounting surface on the lower end of the plate-like member that is parallel to the support surface and on which a level can be placed may be provided. In this way, the level of the support surface that has been rotated by its own weight and adjusted to be level can be easily confirmed, and work accuracy can be improved without impairing workability.

[0051] The fixing member may be provided at a position different from the pivot shaft, which makes it possible to prevent the adjusted horizontal position from shifting when fixing the plate-like member with the fixing member, compared to a method in which the plate-like member is fixed by screwing the pivot shaft itself.

[0052] The fixing member may be a pair provided across the rotation axis, which can further prevent the plate-like member from rotating erroneously when, for example, a water line is hooked on a support surface after the plate-like member is fixed by the fixing members.

[0053] The pivot shaft may be a shaft protruding from the mounting member, and the plate-like member may have a plate portion having an axial hole through which the shaft is rotatably inserted and a surface direction aligned along the vertical direction, and a bent plate portion formed by bending the lower end of the plate portion and having an upper surface forming the mounting surface. In this way, the plate-like member having a mounting surface on which a level can be placed can be easily formed by, for example, bending sheet metal. This reduces the parts and material costs of the stake-setting device.

[0054] The second aspect of the present invention is a stake-tensioning method that uses at least one pair of stake-tensioning devices that are detachably attached to the piles and hold one end of the stake-tensioning device, and stretches the stake-tensioning device between the pair of stake-tensioning devices, and includes the steps of: attaching mounting members provided on each stake-tensioning device to any height position of the pair of piles; rotating a plate-shaped member supported rotatably on the mounting members until it is balanced by its own weight, thereby setting the support surface provided on the plate-shaped member of each stake-tensioning device horizontal; fixing the plate-shaped member with the support surface set horizontally to the mounting members so as not to rotate; and holding the end of the stake-tensioning device against the support surface of each stake-tensioning device that is fixed to the mounting members so as not to rotate, thereby stretching the stake-tensioning device between the pair of stake-tensioning devices. According to this method, the level adjustment of the stake-tensioning device can be performed simply by rotating the plate-shaped member by its own weight. Therefore, this method does not require precise level adjustment work while checking the level, and improves the efficiency of the stake-tensioning work.

[0055] It should be noted that the present invention is not limited to the above-described embodiment, and can of course be freely modified without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0056] 10 stake tensioning device, 12 stake, 14 water line, 16 mounting member, 18 plate-shaped member, 20 fixing member, 22 cylinder, 23 mounting screw, 24 shaft, 25 boss, 30 plate portion, 30a support surface, 30b shaft hole, 30c fixing hole, 31 bent plate portion, 31a mounting surface

Claims

1. A stake tensioning device for removably attaching to a stake and holding one end of a water line, A mounting member that can be attached to the pile at any height position; a plate-like member having a support surface on which the water line is positioned and supported rotatably relative to the mounting member; a fixing member that fixes the plate-like member to the mounting member so as not to rotate; Equipped with The plate-shaped member has a rotation axis relative to the mounting member disposed at the center in the width direction thereof, so that the support surface becomes horizontal when the plate-shaped member rotates by its own weight relative to the mounting member and is balanced. A tensioning device characterized by the above.

2. The tensioning device according to claim 1, The support surface is provided on an upper end of the plate-like member, The lower end of the plate-shaped member is provided with a mounting surface that is parallel to the support surface and on which a level can be placed. A tensioning device characterized by the above.

3. The tensioning device according to claim 1 or 2, The fixed member is provided at a position different from the rotation axis. A tensioning device characterized by the above.

4. The tensioning device according to claim 3, The fixing member is provided as a pair so as to straddle the rotation shaft. A tensioning device characterized by the above.

5. 3. The tensioning device according to claim 2, The rotation axis is formed by a shaft protruding from the mounting member, The plate-like member is a plate portion having an axial hole through which the shaft is rotatably inserted and having a surface direction aligned along the vertical direction; a folded plate portion formed by folding a lower end portion of the plate portion, the upper surface of which forms the placement surface; have A tensioning device characterized by the above.

6. A stake-stretching method using at least one pair of stake-stretching devices for holding one end of a stake and stretching a stake line between the pair of stake-stretching devices, comprising: a step of attaching mounting members provided on each stake setting device to a pair of piles at arbitrary height positions; a step of setting a support surface of the plate-shaped member of each stake-setting device horizontal by rotating the plate-shaped member supported rotatably on the mounting member until the plate-shaped member is balanced by its own weight; a step of fixing the plate-like member with the support surface set horizontally to the mounting member so as not to rotate; a step of tensioning the water line between a pair of the tensioning devices by holding ends of the water line against the support surfaces of the tensioning devices each having a plate-like member fixed to the mounting member so as not to rotate; A method for attaching a sheet of paper comprising the steps of:

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