JP6471612B2 - Tightening adjuster - Google Patents

Description

  The present invention relates to a tension adjusting device for adjusting the position of a water string in a tensioning operation when installing a base material of a structure, and in particular, the position of the end of the water thread is tensioned by the water thread. The present invention relates to a tension adjusting device that can be accurately slid in a direction perpendicular to the direction made.

Conventionally, the tensioning work of the circular base material of the steel tower is as follows: (1) After installing a pair of U-shaped towers on the ground around the excavation hole where the base material is installed, (3) A procedure in which the ends of the water thread are tied to a pair of point nails, and the water thread is stretched above the excavation hole. 1) to (3). With the water string thus stretched, (a) confirmation of the foundation material installation position, (b) confirmation of the installation position after the foundation material installation, (c) confirmation of the foundation material installation position after the reinforcing bar arrangement, and (d ) Confirmation of foundation material installation position after placing concrete.
In addition, since the position of the stretched water string changes depending on the position of the pair of point nails, the position of the pair of point nails is measured with a transit or the like at each of the confirmation operations (a) to (d) above. doing.
However, because the tower is installed on the ground, if a worker or a tool comes in contact with the tower, or if a heavy machine passes around the excavation hole, the point nail may be tilted and the position of the water string may shift. Therefore, when the inclination of the point nail or the like is found in the confirmation operations (a) to (d) above, the position where the water string is stretched is adjusted by inserting and removing the point nail from the tower each time. .
That is, the adjustment of the position of the water yarn is very complicated because it is necessary to repeatedly perform the same operation, and as a result, there is a problem that the work efficiency of the stringing is not good.
Therefore, in order to solve such problems, in recent years, a technique relating to a tension adjusting device that does not require insertion / removal of a point nail has been developed, and some inventions and devices have already been disclosed.

First, Patent Document 1 discloses an invention relating to a jig for installing a mold base on which a water string tensioning member on which a water thread is locked slides under the name of “a jig for installing a mold base in a concrete foundation”. It is disclosed.
Hereinafter, the invention disclosed in Patent Document 1 will be described. The invention relating to the jig for installing the formwork base disclosed in Patent Document 1 includes a jig body supported by a support leg so that the height can be adjusted, and a locking portion for locking the water thread, and A water tension member attached to the jig main body so as to be slidable in a direction perpendicular to the tension direction of the water string, and a connecting portion for locking the water string tension member and sliding the water string tension member in the sliding direction. At the lower end, and a positioning member provided with a pointing portion for adjusting to the position of the water string stretched around the outer periphery.
In the installation tool for the formwork base having such a feature, the positioning member locked to the water string tension member is slid to the left and right so as to match the water string indicating the building reference line. The member can be set at an accurate position with respect to the left-right direction.

Next, Patent Document 2 discloses an invention relating to a water yarn tensioning jig that can easily adjust the position of the water yarn under the name of “water yarn tensioning jig”.
The invention disclosed in Patent Document 2 includes two or more struts, a cross member installed between opposing struts erected on the ground, and a mover that can slide on the cross member and can be fixed at a desired position. These are made of metal, and the cross member is attached to the support column so that it can be raised and lowered and fixed at a desired position, and the mover is provided with a latch that can lock the water thread. .
In the water yarn tensioning jig having such a feature, the mover can be slid along the cross member and fixed at a desired position, the lateral positioning accuracy is high, and the water yarn is stretched at an accurate position. be able to.

Next, Patent Document 3 discloses a device related to a water string tensioner that can be reused without using a nail under the name “water string tension tool”.
The device disclosed in Patent Document 3 includes a fixture that is detachably attached to a pile and is formed with a plurality of thread hooks to which one end of a water thread is attached, and a support in which screw holes are formed in the pile. The tool is attached so that the height position can be changed, and the fixture is attached to the support tool so that the attachment angle can be changed.
In the water string tensioner having such a feature, a plurality of round holes or elongated holes are formed along the longitudinal direction of the mounting tool, and the support tool depends on which hole the bolt is passed through. It is possible to change the mounting position of the mounting tool relative to. At that time, in the case of a long hole, the position of the fixture relative to the support can be arbitrarily adjusted by moving the bolt along the long hole.

Next, Patent Document 4 discloses a device related to an outer wall feeding device capable of accurately feeding the outer wall under the name “outer wall feeding device”.
The device disclosed in Patent Document 4 includes a screw hole provided on an outer surface of a column beam joint, a screw body screwed into the screw hole, a screw body coupled to the screw body, and a water line locking claw supported. It consists of a nut.
In the outer wall feeding device having such a feature, the water thread is stretched between the water thread locking claws of a pair of adjacent water thread locking tools, and the rotation of the nut is applied to the screw body. Since it is converted into a linear motion along, it is possible to adjust the linear motion of the nut with high accuracy. Therefore, the position of the water string can be easily adjusted, and the street of the outer wall can be taken out accurately.

Japanese Patent Laid-Open No. 7-252937 JP 2000-55662 A Registered Utility Model No. 3154329 CD-ROM of Japanese Patent Application No. 3-82899 (Japanese Utility Model Application No. 5-6019)

  However, in the invention disclosed in Patent Document 1, since the position of the water string tension member is adjusted by the operator's hand and then the position is fixed by tightening the nut, the adjustment is troublesome. At the same time, it is difficult to make fine adjustments in the position adjustment in the left-right direction. In addition, since the installation base to which the jig body is attached is installed on the ground, the nut may be loosened due to an operator's tripping or the like, and the position of the water thread may be shifted.

  Next, in the invention disclosed in Patent Document 2, since the mover slides along the cross member by the operator's hand, it is difficult to finely adjust the position of the mover, and the position of the water thread is accurately determined. May not be able to adjust.

  Furthermore, in the device disclosed in Patent Document 3, since the fixture is attached to the pile driven into the ground via the support tool, the worker is attached to the fixture or the like as in the invention disclosed in Patent Document 1. There is a possibility that the position of the water string may shift due to contact. Furthermore, the fixture can be rotated around the bolt and can move along the elongated hole. That is, since two types of operations are required, adjustment work may be complicated.

  In the device disclosed in Patent Document 4, since one end of the screw body is fixed to the screw hole, the screw body may be inclined and screwed into the screw hole. There is a possibility that the water string cannot be tensioned more accurately. In addition, since the thread body may be bent by maintaining the state in which the water thread is locked to the water thread locking claw for a long period of time, it is difficult to stably hold the water thread to the initial position. There is sex.

  The present invention has been made in response to such a conventional situation, the position of the stretched water string can be finely adjusted with a simple operation with high accuracy, and the position where an operator or the like does not contact It is an object of the present invention to provide a tension adjusting device that can be installed in a stable manner and can stably maintain the position of the tensioned water string over a long period of time.

  In order to achieve the above object, a first invention is a tension adjusting device for adjusting the position of a water string in a tensioning operation when a foundation material of a structure is installed. A cylindrical body that is attached to a pillar fixed to a liner plate that is installed as a retaining wall in the excavation hole, and that is provided with slits along the longitudinal direction, and that is provided across both ends of the cylindrical body. A screw member housed inside the body, a fastening member attached to at least one of the screw member and the tubular body, an annular member attached to the screw member inside the tubular body, and the annular member A rod-like member that is erected and to which a water thread is bound, and the screw member has a first screw portion formed on the shaft body, and at least one of the proximal end and the distal end is the both end portions, respectively. Corresponding end On the other hand, the annular member is rotatably fixed via a fastening member, and the annular member has a second threaded portion formed on the inner peripheral surface thereof, and the lower end of the rod-shaped member is an annular member. It is characterized by being fixed to the outer peripheral surface of the tube and having its upper end protruding outside the cylindrical body and passing through the slit.

In the invention of such a configuration, the support column is, for example, a pair of steel pipes installed along the vertical direction, and on the upper edge of the liner plate assembled in a cylindrical shape as a retaining wall of a drilling hole of a steel tower, It is fixed with bolts or the like.
Moreover, a cylindrical body is attached in the desired height from the ground between such a steel pipe. Furthermore, “a screw member that is provided across both ends of the cylindrical body and is accommodated in the cylindrical body” includes, for example, a screw member that passes through the center of both ends of the cylindrical body so that the screw member penetrates. A configuration in which the member is supported is conceivable.
And "the fastening member attached to at least one of the screw member and the cylindrical body" describes the position where the fastening member is supported, and when the fastening member is attached to the screw member, When the fastening member is attached to the cylindrical body, it means three cases of the fastening member being attached to both the screw member and the tubular body.
Further, “at least one of the proximal end and the distal end of the screw member is fixed to the corresponding end portion of both end portions so as to be rotatable via a fastening member,” for example, When the proximal end is pivotally fixed to one end of the cylindrical body via a fastening member, or the distal end of the screw member is attached to the other end of the cylindrical body. When the screw member is fixed so as to be pivotable, or when the base end and the distal end of the screw member are pivotally fixed to the both ends of the cylindrical body via the fastening members, respectively. Is included.

In the invention having the above-described configuration, the rod-shaped member is fixed to the annular member and disposed through the slit, so that the rod-shaped member is engaged with the slit. Therefore, the annular member cannot be rotated even if the screw member is rotated. On the other hand, since the annular member is formed with a second screw portion screwed to the first screw portion of the screw member on the inner peripheral surface, the annular member slides along the screw member instead of being rotatable.
Moreover, since the lower end of the rod-shaped member to which the water thread is bound is fixed to the outer peripheral surface of the annular member, the rod-shaped member and the water thread slide along the slit as the screw member rotates. It becomes.
Furthermore, by attaching the fastening member to both ends or the screw member, the screw member is allowed to rotate and the movement of the screw member along the longitudinal direction of the cylindrical body is suppressed.

Next, the second invention is the elasticity according to the first invention, wherein the fastening member is screwed to the proximal end or the distal end inside the cylindrical body and urges the screw member to move along the slit. It is a body.
In the invention having such a configuration, the elastic body is, for example, a push spring that is screwed between one end of the cylindrical body and one end of the first screw portion on the base end side of the screw member. Thus, it is conceivable that the screw member is urged so as to move the tip of the screw member to the other end of the cylindrical body along the slit. In this case, the urging force of the elastic body needs not to press the tip of the screw member against the other end of the cylindrical body to such an extent that the screw member is difficult to rotate.
In the invention of the above configuration, in addition to the action of the first invention, the elastic member allows the rotation of the screw member and suppresses rattling during the rotation of the screw member. Furthermore, even when the screw member is stationary, the position of the water thread is maintained because the position of the screw member does not change with respect to the cylindrical body.

Furthermore, the third invention is characterized in that, in the first or second invention, the screw member is provided with a knob at the base end outside the cylindrical body.
In the invention having such a configuration, as the knob portion, for example, a nut fixed to the base end by welding or the like, a concave portion provided at the base end, and the like can be considered.
In the invention of the above configuration, in addition to the action of the first or second invention, the knob is gripped and the screw member is rotated, so that the finger is prevented from sliding from the screw member.

The fourth invention is characterized in that, in any one of the first to third inventions, the cylindrical body is provided with a level for detecting an inclination relative to the horizontal in the longitudinal direction.
In the invention having such a configuration, in addition to the action of any one of the first to third inventions, the cylindrical body is attached to the support column so that the longitudinal direction of the cylindrical body is horizontal.

According to the first invention, since the annular member slides along the screw member as the screw member rotates, the rod-like member and the water string also slide along the slit. Can be completed.
At this time, since the rotational movement of the screw member can be converted into the sliding movement of the rod-shaped member, the position of the stretched water string can be finely adjusted with high accuracy.
Furthermore, when the cylindrical body is not installed near the ground, it is possible to prevent the worker or the like from contacting the rod-shaped member or the water string. In addition, since the vibration generated by the passage of heavy machinery is not strongly received, it is possible to prevent the rod-shaped member from being displaced due to the vibration. Therefore, the position of the stretched water string can be stably maintained over a long period of time.

  According to the second invention, in addition to the effects of the first invention, the annular member can smoothly slide along the screw member.

  According to the third invention, in addition to the effect of the first or second invention, the knob prevents the finger from slipping from the screw member, so that the operation for slightly rotating the screw member is performed. Can be done accurately.

  According to the fourth invention, in addition to the effects of any one of the first to third inventions, for example, the arrangement of the cylindrical body with respect to the column can be determined in advance so that the longitudinal direction of the cylindrical body is horizontal. It is possible to quickly attach the cylindrical body to the support column.

(A) is an external view at the time of seeing the tension adjustment apparatus which concerns on an Example from upper direction, (b) is an A direction arrow directional view in (a). (A) And (b) is the figure which abbreviate | omitted some cylindrical bodies in Fig.1 (a) and FIG.1 (b), respectively. It is a perspective view of the tension adjusting device which concerns on an Example. It is an external view which shows the use condition of the tension adjusting device which concerns on an Example.

The tension adjusting device of the Example which concerns on embodiment of this invention is demonstrated in detail using FIG. 1 thru | or FIG. Fig.1 (a) is an external view at the time of seeing the tension adjustment tool based on an Example from upper direction, FIG.1 (b) is an A direction arrow view in Fig.1 (a).
As shown in FIGS. 1 (a) and 1 (b), the tension adjusting device 1 according to the present embodiment is a water string in the tensioning operation when installing the base material 50 (see FIG. 4) of the structure. This is a tension adjusting device for adjusting the position of L (see FIGS. 3 and 4).
The string tension adjusting device 1 is attached to support columns 51 and 51 (see FIG. 4) installed opposite to each other across the base material 50, and the cylindrical body 2 provided with the slit 3 along the longitudinal direction X; A screw member 4 that is provided across both end portions 2a and 2b of the cylindrical body 2 and is accommodated in the inside 2c of the cylindrical body 2, and fastening members 7 and 8 (see FIG. 2) attached to the screw member 4. In the inside 2c of the cylindrical body 2, an annular member 5 (see FIG. 2) attached to the screw member 4 and a rod-like member 6 standing on the annular member 5 and to which the water string L is bound are provided. . Among these, in the cylindrical body 2, both end portions 2a and 2b are flat plates through which the screw member 4 passes. Further, a level 10 for detecting the inclination of the longitudinal direction X with respect to the horizontal is provided between the end 2a and the end 2b.

Next, the inside of the cylindrical body will be described in more detail with reference to FIG. 2 (a) and 2 (b) are views in which a part of the cylindrical body is omitted in FIGS. 1 (a) and 1 (b), respectively. In addition, about the component shown in FIG. 1, the same code | symbol is attached | subjected also in FIG. 2, and the description is abbreviate | omitted. The illustration of the level 10 is also omitted.
As shown in FIG. 2 (a) and 2 (b), the screw member 4, together with the first threaded portion _{S 1} is formed on the shaft body 4c, a base end 4a and the tip 4b are both end portions 2a, 2b On the other hand, it is fixed so as to be rotatable via a fastening member 7 and a fastening member 8, respectively.
Further, the screw member 4 is provided with a knob 9 at the base end 4 a outside the cylindrical body 2. The knob portion 9 is a nut welded to the base end 4a, and includes two blades 9a protruding in the radial direction of the base end 4a.
The proximal end 4a and the distal end 4b of the screw member 4 refer to ranges that occupy a certain length with the both end portions 2a and 2b of the cylindrical body 2 interposed therebetween. That is, the base end 4a and the front end 4b are not only the both cut end faces 4d and 4e of the screw member 4, respectively, but a concept indicating a part of the shaft body 4c including both the cut end faces 4d and 4e. .

Next, the fastening member 7 is screwed to the small-diameter base end 4 a in the inside 2 c of the cylindrical body 2, and moves the screw member 4 along the slit 3 in the direction of the end portion 2 b (X ₁ ). It is a coil spring that urges to. The fastening member 8 is a nut that is fixed to the distal end 4 b in the inside 2 c of the cylindrical body 2, and the end surface 8 a abuts against the end 2 b of the cylindrical body 2. That is, the fastening members 7 and 8 can rotate together with the screw member 4.
Further, the annular member 5 is formed with a _second screw portion S2 which is screwed into the _first screw portion S1 on the inner peripheral surface 5a.
2B, the lower end 6a of the rod-like member 6 is firmly fixed to the outer peripheral surface 5b of the annular member 5, for example, by welding, and the upper end 6b of the rod-like member 6 is outside the cylindrical body 2. It protrudes and is disposed through the slit 3. In more detail, the rod-shaped member 6 is arrange | positioned along the normal line direction of the outer peripheral surface 5b.

Next, the operation of the tension adjusting device according to the present embodiment will be described in detail with reference to FIG. FIG. 3 is a perspective view of the tension adjusting device according to the embodiment. 1 and 2 are denoted by the same reference numerals in FIG. 3 and description thereof is omitted. The illustration of the level 10 is also omitted.
As shown in FIG. 3, when the screw member 4 is rotated by grasping the blade 9 a of the knob 9, the annular member 5 stays at the position attached to the screw member 4 and tries to rotate together with the screw member 4. To do. However, since the lower end 6 a of the rod-shaped member 6 is fixed to the outer peripheral surface 5 b of the annular member 5 and the rod-shaped member 6 is disposed through the slit 3, the rod-shaped member 6 is locked to the slit 3. It is in the state. Therefore, even if the screw member 4 rotates, the annular member 5 cannot rotate together therewith. On the other hand, since the annular member 5 is formed with the _second screw portion S2 on the inner peripheral surface 5a, the annular member 5 cannot slide with the screw member 4, but slides along the screw member 4. Become. More specifically, rotates the screw 4 in the α direction or β direction, the annular member 5 is slid to the X ₂ direction or X ₁ direction.
Further, since the rod-like member 6 to which the water string L is bound is fixed to the outer peripheral surface 5 b of the annular member 5, the rod-like member 6 and the water yarn L enter the slit 3 as the screw member 4 rotates. It will slide along.

Further, in Zhang Zhang adjustment device 1, by fastening member 7, the tip 4b of the screw member 4 is biased to move in a direction X ₁ of the end 2b of the tubular body 2, the end face of the fastening member 8 8a is in strong contact with the end 2b of the cylindrical body 2. Therefore, the position along the longitudinal direction X of the screw member 4 does not change, and the position of the water string L is maintained. Furthermore, rattling during the rotation of the screw member 4 is also suppressed.

And the use condition of the tension adjusting device which concerns on a present Example is demonstrated in detail using FIG. FIG. 4 is an external view illustrating a usage state of the tension adjusting device according to the embodiment. The constituent elements shown in FIGS. 1 to 3 are denoted by the same reference numerals in FIG. 4 and the description thereof is omitted. Further, illustration of the screw member 4, the level 10, etc. is also omitted.
As shown in FIG. 4, the support column 51 is, for example, a steel pipe installed along a vertical direction, and is a liner plate 53 assembled in a cylindrical shape as a retaining wall of an excavation hole 52 for installing the base material 50. It is fixed to the upper edge 53a by a bolt 54. The upper edge 53a is installed at a certain height from the ground G.
The cylindrical body 2 is attached between the support column 51 and the support column 51 through a mounting portion 55 at a desired height from the ground G. At this time, since the level 2 (see FIG. 1) is provided in the cylindrical body 2, the arrangement of the cylindrical body 2 with respect to the support column 51 is determined in advance so that the longitudinal direction X is horizontal. A more accurate position of the rod-like member 6 is determined later using a transit or the like. Specifically, the height of the cylindrical body 2 from the ground G is, for example, about 1 (m), and as the attachment portion 55, for example, a cross clamp or the like is used.
The base material 50 is installed in the excavation hole 52 as designed by making the upper end 50a coincide with the height of the water string L stretched by the pair of tension adjusting devices 1 installed in this way.

As described above, according to the tension adjusting device 1 of the present embodiment, the rod-shaped member 6 (member corresponding to a point nail) and the water thread L slide along the slit 3 as the screw member 4 rotates. Since it moves, the position of the water thread L can be adjusted easily. For this reason, it is not necessary to repeat a complicated procedure such as insertion and removal of point nails, which has been conventionally performed, and the tensioning operation can be completed efficiently.
At this time, since the rotational movement of the screw member 4 can be converted into the sliding movement of the rod-like member 6, the water thread is directly slid by hand as in the inventions or devices disclosed in Patent Documents 1 to 3. Compared to the above, the position of the stretched water string can be finely adjusted with high accuracy. Further, since this fine adjustment can be performed by one very simple operation of rotating the screw member, the position of the water string L is not repeated depending on the skill level of the operator and the like. Can be adjusted with uniform and high accuracy.

Furthermore, since the screw member 4 does not change the position along the longitudinal direction X of the screw member 4 by the fastening members 7 and 8, the reproducibility at the time of adjusting the position of the water string L is good. Further, since the rattling of the screw member 4 is suppressed by the fastening members 7 and 8, the annular member 5 can smoothly slide and move along the screw member 4, and the water string L slides. The error when moving can be made small enough to be ignored.
In addition, since the finger member 9 prevents the finger from slipping from the screw member 4 during rotation, the screw member 4 is accurately operated when the screw member 4 is slightly rotated. Can do. Therefore, fine adjustment of the position of the water thread L can be performed reliably.

Further, since the lower end 6a of the rod-like member 6 is firmly fixed to the outer peripheral surface 5b of the annular member 5 and is locked by the slit 3, the rod-like member 6 is bent during the initial to completion of the tensioning operation. Can be suppressed. Therefore, it is possible to stably maintain the state in which the rod-shaped member 6 is disposed substantially orthogonal to the outer peripheral surface 5b.
Furthermore, since the cylindrical body 2 is attached at a position away from the vicinity of the ground G via the support column 51 and the liner plate 53, it is possible to prevent contact of the worker with the rod-shaped member 6 and the water string L. It is possible to greatly reduce the influence of vibration caused by the passage of heavy machinery. Therefore, the position of the stretched water string L can be stably maintained over a long period of time. Further, since the cylindrical body 2 is provided with the level 10, it can be attached to the column 51 more accurately and quickly.

In addition, the structure of the tension adjusting device 1 of this invention is not limited to what is shown in an Example. For example, when the end 2a of the cylindrical body 2 is strongly sandwiched between the knob 9 and the fastening member 7, the movement of the screw member 4 along the longitudinal direction X is suppressed, so the fastening member 8 is not provided. May be.
Further, the fastening member 7 is screwed to the tip 4b of the screw member 4 in the inside 2c of the cylindrical body 2, and moves the screw member 4 along the slit 3 in the direction of the end portion 2a (X ₂ ). It may be an elastic body to be urged. In this case, the fastening member 8 is a nut fixed to the tip 4b of the screw member 4 outside the cylindrical body 2, and the end surface opposite to the end surface 8a abuts the end 2b, so that the longitudinal direction X The movement of the screw member 4 along the line can be suppressed.
Further, the fastening member 7 is screwed to the proximal end 4a of the screw member 4 in the inside 2c of the cylindrical body 2, and the fastening member 8 is installed in the inside 2c of the cylindrical body 2, and the fastening member 8 When the end surface 8a of the screw member 4 is fixed to the end portion 2b, the fastening member 8 does not rotate with the screw member 4, and the tip end 4b of the screw member 4 is locked to the fastening member 8, the tip end 4b becomes the end portion 2b. May not be penetrated or may be penetrated.
Further, the ends 2a and 2b of the cylindrical body 2 may be open ends, and the open ends are respectively closed by plate-like fastening members that can penetrate the screw member 4, and screws are attached to the plate-like fastening members. The structure which can suppress the movement of the screw member 4 along the longitudinal direction X may be sufficient because the base end 4a and the front-end | tip 4b of the member 4 are each latched. Further, as the knob 9, a recess may be provided on the base end 4 a.

  INDUSTRIAL APPLICABILITY The present invention can be used as a tension adjusting device for adjusting the position of a water string in a tensioning operation when installing a base material of a structure.

DESCRIPTION OF SYMBOLS 1 ... Tightening adjustment tool 2 ... Cylindrical body 2a, 2b ... End 2c ... Inside 3 ... Slit 4 ... Screw member 4a ... Base end 4b ... Tip 4c ... Shaft body 4d, 4e ... Cutting end surface 5 ... Annular member 5a ... Inner peripheral surface 5b ... Outer peripheral surface 6 ... Bar-shaped member 6a ... Lower end 6b ... Upper end 7, 8 ... Fastening member 8a ... End surface 9 ... Knob 9a ... Blade 10 ... Level 50 ... Base material 50a ... Upper end 51 ... Post 52 ... Excavation holes 53 ... liner plates 53a ... upper 54 ... bolt 55 ... mounting portion L ... stringlines S 1 _... first screw portion S 2 _... second threaded portion

Claims (4)

In the tensioning work when installing the foundation material of the structure, it is a tensioning adjusting device for adjusting the position of the water string,
A cylindrical body that is attached to a column fixed to a liner plate that is installed as a retaining wall in an excavation hole for installing the foundation material, and in which a slit is provided along the longitudinal direction;
A screw member provided across both ends of the cylindrical body, and housed in the cylindrical body;
A fastening member attached to at least one of the screw member and the tubular body;
An annular member attached to the screw member inside the cylindrical body;
A rod-like member that is erected on the annular member and to which the water string is bound;
The screw member is formed with a first screw portion on the shaft body, and at least one of the base end and the distal end is rotatable with respect to the corresponding end portion of the both end portions via the fastening member. Fixed to
The annular member is formed with a second screw portion that is screwed onto the first screw portion on an inner peripheral surface thereof,
The rod-like member has a lower end fixed to the outer peripheral surface of the annular member, and an upper end thereof protrudes to the outside of the cylindrical body and is disposed through the slit. Instruments.   The fastening member is an elastic body that is screwed to the proximal end or the distal end inside the cylindrical body and biases the screw member to move along the slit. The tension adjusting device according to Item 1.   The tension adjusting device according to claim 1 or 2, wherein the screw member is provided with a knob at a proximal end outside the cylindrical body.   The tension adjusting device according to any one of claims 1 to 3, wherein the cylindrical body is provided with a level for detecting an inclination of the longitudinal direction with respect to the horizontal.

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