JP5416610B2 - Tubular axis position specifying jig, tube axis position specifying method and mounting hole marking method using the axis position specifying jig - Google Patents

Description

  The present invention relates to a jig for specifying the axial center position of a pipe body such as an existing pipe, a method for specifying the axial center position of the pipe body using the axial center position specifying jig, and the axial center position of the specified pipe body. To obtain the three-dimensional coordinates required for various constructions around the axial center, for example, a circle centered on the axial center of the tube on the inner wall of a manhole to which the tube is connected The present invention relates to a method of drawing a mounting hole on the circumference.

  Conventionally, in order to rehabilitate existing pipes such as sewer pipes that have deteriorated over time, the existing pipes buried in the ground over adjacent manholes are smaller in diameter than the inner diameter of the existing pipes, and are circular at the shape memory temperature. Insert a liner material made of thermoplastic resin such as vinyl chloride that recovers its shape, heat the liner material to expand its diameter, restore it to a circular tube shape, and then adhere the liner material to the inner peripheral surface of the existing pipe A rehabilitation method for forming a rehabilitation pipe has been proposed and implemented (see, for example, Patent Document 1).

  In this case, if ground deformation occurs due to an earthquake or the like, the existing pipe may be displaced with respect to the manhole, and in that case, it is difficult to ensure the water stop performance of the connection between the manhole and the existing pipe. Become.

  For this reason, a water stop member having a flange formed with a stretchable portion that can be extended in the radial direction is disposed between the inner wall surface of the manhole and the inner peripheral surface of the rehabilitation pipe, An invention has been proposed that attempts to ensure water stopping performance against displacement (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 11-230212 JP 2008-248602 A

  By the way, as for the water stop member which has an extendable part, the large diameter side of a flange is fixed to the inner wall surface of a manhole via an anchor bolt, and the small diameter side of a flange is fixed to the inner peripheral surface of a rehabilitation pipe via a diameter expansion ring. The In this case, in order to uniformly extend the extensible portion of the water stop member over the entire circumference, the flange is not in the center of the small diameter side of the flange, that is, the shaft center of the rehabilitation pipe to which the small diameter side of the flange is fixed. It is necessary to fix to the inner wall surface of the manhole so that the centers on the large diameter side coincide.

  However, when fixing the large diameter flange side of the water-stopping member to the inner wall surface of the manhole, there is only a pipe (space) of the existing pipe and rehabilitation pipe, and the axial center position is unknown. It is not possible to fix the water stop member by aligning the center of the tube with the center.

  Therefore, a cylindrical flange member having an outer peripheral flange at the distal end of the bar projecting into the manhole, with a bar disposed at the bottom of the existing pipe (rehabilitated pipe) with the distal end projecting into the manhole. The anchor bolt driving position for fixing the water stop member is determined by placing the outer peripheral flange of the flange member on the inner wall surface of the manhole and marking the circumference along the outer peripheral edge. I want to ask. However, such a positioning method not only makes the operation complicated, but also requires a large number of flange members corresponding to the types of inner diameters of existing pipes and the like, which increases the cost. In addition, due to the low accuracy, misalignment with the axis of the existing pipe is likely to occur, and in the event of misalignment, the water stop member cannot be fixed with the center of the existing pipe aligned with the center. It becomes. As a result, when an earthquake or the like occurs, the water stop member cannot be extended uniformly, which may lead to an unexpected situation.

  In response to such a problem, the present invention uses an axial center position specifying jig and an axial center position specifying jig of a pipe body that can easily and reliably specify the axial center of a pipe body such as an existing pipe. The present invention provides a method for specifying a tube axis position. Also, a method for obtaining the three-dimensional coordinates required when performing various constructions around the axial center position with the specified axial center position of the tubular body as the origin, for example, the circumference around the axial center of the tubular body It is an object of the present invention to provide a mounting hole marking method capable of easily marking a mounting hole located on the surface of a wall body to which a tubular body is connected.

  The axial center position specifying jig of the tubular body of the present invention includes a central shaft having a male screw, a nut member having a female screw corresponding to the male screw of the central shaft and screwed to the central shaft, and rotatable about the central shaft. A supported bearing member, a plurality of one arms each having a base end portion rotatably connected to the nut member at a circumferential interval, and a base end portion circumferentially spaced from the bearing member. Each of the one arm and each of the other arms is composed of a plurality of other arms that are rotatably connected, and a plurality of receiving members in which the tip of each one arm and the tip of each of the other arms are rotatably connected. Are formed in the same length, and each receiving member has a receiving surface parallel to the axis of the central axis, and the corresponding one arm and the other through movement of the nut member by rotation of the central axis Identical to the center axis Is degrees rotation, is characterized in placing the central axis abut respectively each receiving member at intervals in the circumferential direction on the tube inside circumference to the tube of the axis.

  According to the present invention, the axial center position specifying jig is disposed in the pipe body, the center axis is rotated, and the nut member is moved along the center axis so as to narrow the gap between the bearing member, The one arm and each other arm are rotated by the same angle in the direction of standing with respect to the central axis, and the corresponding receiving members are fixed to the tubular body by abutting against the circumferential surface of the tubular body at intervals in the circumferential direction. can do.

  In this case, the plurality of receiving members of the axial center position specifying jig abutted on the inner peripheral surface of the tubular body at intervals in the circumferential direction are supported by the one arm and the other arm having the same length. Therefore, the distance from the receiving surface of each receiving member to the central axis is the same, and the central axis is arranged at the axial center of the tube.

  As a result, the center axis can be reliably placed on the axis of the tube body by a simple operation of installing the axis position specifying jig in the tube body and rotating the center axis.

  In the present invention, it is preferable that each of the corresponding one arm and each other arm form an equiangular trapezoidal leg whose angle with the central axis is less than 90 degrees. As a result, the central axis, each corresponding one arm, each other arm, and each receiving member form the same isometric trapezoidal pantograph mechanism, so that the shape can be reliably held.

  In the present invention, it is preferable that the bearing member is positioned on the central axis via a thrust bearing. Thereby, it can prevent that the bearing member rotatably supported with respect to the central axis rotates following the rotation of a rotating shaft.

  In the present invention, it is preferable that gears meshing with each other are provided at the tip end portions of the corresponding one arm and the tip end portion of the other arm. Accordingly, the corresponding one arm and each other arm can be reliably rotated by the same angle in synchronization.

  In the present invention, an attachment hole marking tool in which a plurality of attachment holes are formed on a circumference around the center axis at intervals in the circumferential direction may be detachably attached to the center axis. preferable. As a result, the mounting hole marking tool is attached to the central axis arranged at the axial center of the tube body, so that the mounting hole is located on the circumference centered on the axial center of the tube body. A hole can be marked on the surface of the wall body to which the tube body is connected.

  According to the tube axis position specifying method using the axis position specifying jig of the present invention, the axis position specifying jig according to any one of claims 1 to 4 is arranged in the tube, and the center axis is set. Rotate to move the nut member, rotate each corresponding one arm and each other arm at the same angle with respect to the central axis, and abut each receiving member on the circumferential surface of the tubular body at intervals in the circumferential direction The central axis is arranged at the axial center of the tube body.

  According to the present invention, the axial center position specifying jig is disposed in the pipe body, the center axis is rotated, and the nut member is moved along the center axis so as to narrow the gap between the bearing member, One arm and each other arm are rotated by the same angle in the direction of standing with respect to the central axis, and each receiving member is abutted against the circumferential surface of the tubular body at intervals in the circumferential direction and fixed to the tubular body Can do.

  In this case, the plurality of receiving members of the axial center position specifying jig abutted on the inner peripheral surface of the tubular body at intervals in the circumferential direction are supported by the one arm and the other arm having the same length. Therefore, the distance from the receiving surface of each receiving member to the central axis is the same, and the central axis is arranged at the axial center of the tube.

  As a result, the center axis can be reliably arranged on the axis of the tube body by a simple operation of installing the axis position specifying jig in the tube body and rotating the center axis.

  In the mounting hole ruler method using the axial center position specifying jig of the present invention, the axial center position specifying jig according to any one of claims 1 to 4 is disposed in the tube, and the central axis is rotated. The nut member is moved, the corresponding one arm and each other arm are rotated by the same angle with respect to the central axis, and each receiving member is abutted against the circumferential surface of the tubular body at a circumferential interval, respectively. After placing the shaft at the axial center of the tube, install the mounting hole marking tool with a plurality of mounting holes spaced in the circumferential direction on the circumference centered on the central axis and attach it to the central axis The method is characterized in that a plurality of mounting holes are ruled on the surface of the wall body by applying to the surface of the wall body to which the tubular body is connected and using the mounting holes of the mounting hole marking jig.

  According to the present invention, the axial center position specifying jig is disposed in the pipe body, the center axis is rotated, and the nut member is moved along the center axis so as to narrow the gap between the bearing member, One arm and each other arm are rotated by the same angle in the direction of standing with respect to the central axis, and each receiving member is abutted against the circumferential surface of the tubular body at intervals in the circumferential direction and fixed to the tubular body Can do. Next, by attaching a mounting hole marking tool to the central axis, the mounting hole can be scored using the mounting hole on the surface of the wall body to which the tubular body is connected.

  In this case, the plurality of receiving members of the axial center position specifying jig abutted on the inner peripheral surface of the tubular body at intervals in the circumferential direction are supported by the one arm and the other arm having the same length. Therefore, the distance from the receiving surface of each receiving member to the central axis is the same, and the central axis is arranged at the axial center of the tube. On the other hand, since the mounting holes of the mounting hole marking tool mounted on the central axis are formed on the circumference centered on the central axis, the mounting holes marked on the surface of the wall body are It is located on the circumference centered on the body axis.

  As a result, the mounting hole marking tool is attached to the central axis of the axial center specifying jig fixed to the tube, so that the mounting hole located on the circumference centering on the axis of the tube is piped. It is possible to easily draw a ruled surface on the surface of the wall body to which the body is connected.

  An axial center position specifying jig for a tubular body of the present invention includes a central axis, a moving member that is movably inserted along the central axis, a fixed member that is fixed to the central axis, and a circumferential direction on the moving member. A plurality of one arms each having a base end portion rotatably connected thereto at an interval; and a plurality of other arms each having a base end portion rotatably connected to the fixing member at a circumferential interval; The tip of each one arm and the tip of each other arm are each composed of a plurality of receiving members that are rotatably connected. Each one arm and each other arm are formed to have the same length. , Each having a receiving surface parallel to the axis of the central axis, moving the moving member along the central axis, and rotating the corresponding one arm and the other arm at the same angle with respect to the central axis, The receiving member is spaced circumferentially on the circumferential surface of the tube. Abutment, is characterized in placing the central axis is fixed to the central axis moving member to the tube axis center.

  According to the present invention, each of the corresponding one arm and each other arm is arranged by disposing the axial center position specifying jig in the tube and moving the moving member along the central axis so as to reduce the distance from the fixed member. Are rotated by the same angle in the direction of rising with respect to the central axis, and each receiving member is abutted against the circumferential surface of the tubular body at intervals in the circumferential direction. Next, when the moving member is fixed to the central axis in a state where each receiving member is abutted against the peripheral surface of the tubular body, it can be fixed to the tubular body.

  In this case, the plurality of receiving members of the axial center position specifying jig abutted on the inner peripheral surface of the tubular body at intervals in the circumferential direction are supported by the one arm and the other arm having the same length. Therefore, the distance from the receiving surface of each receiving member to the central axis is the same, and the central axis is arranged at the axial center of the tube.

  As a result, the center axis is surely arranged at the axis of the tube body by a simple operation of installing the axis position specifying jig in the tube body and moving the moving member along the center axis and fixing it to the center axis. be able to.

  In the present invention, it is preferable that each of the corresponding one arm and each other arm form an equiangular trapezoidal leg having an angle of less than 90 degrees with the central axis. As a result, the central axis, each corresponding one arm, each other arm, and each receiving member form the same isometric trapezoidal pantograph mechanism, so that the shape can be reliably held.

  In the present invention, it is preferable that gears meshing with each other are provided at the tip end portions of the corresponding one arm and the tip end portion of the other arm. Accordingly, the corresponding one arm and each other arm can be reliably rotated by the same angle in synchronization.

  In the present invention, an attachment hole marking tool in which a plurality of attachment holes are formed on a circumference around the center axis at intervals in the circumferential direction may be detachably attached to the center axis. preferable. As a result, the mounting hole marking tool is attached to the central axis arranged at the axial center of the tube body, so that the mounting hole is located on the circumference centered on the axial center of the tube body. A hole can be marked on the surface of the wall body to which the tube body is connected.

  According to another aspect of the present invention, there is provided a tube axis position specifying method using the axis position specifying jig, wherein the axis position specifying jig according to any one of claims 8 to 10 is disposed in the tube, and the moving member is arranged. Each of the corresponding one arm and each other arm is moved along the central axis and rotated by the same angle with respect to the central axis, and each receiving member is abutted against the circumferential surface of the tubular body at intervals in the circumferential direction, The moving member is fixed to the central axis, and the central axis is arranged at the axial center of the tubular body.

  According to the present invention, each of the corresponding one arm and each other arm is arranged by disposing the axial center position specifying jig in the tube and moving the moving member along the central axis so as to reduce the distance from the fixed member. Are rotated by the same angle in the direction of rising with respect to the central axis, and each receiving member is abutted against the circumferential surface of the tubular body at intervals in the circumferential direction. Next, when the moving member is fixed to the central axis in a state where each receiving member is abutted against the peripheral surface of the tubular body, it can be fixed to the tubular body.

  In this case, the plurality of receiving members of the axial center position specifying jig abutted on the inner peripheral surface of the tubular body at intervals in the circumferential direction are supported by the one arm and the other arm having the same length. Therefore, the distance from the receiving surface of each receiving member to the central axis is the same, and the central axis is arranged at the axial center of the tube.

  As a result, the center axis is surely arranged at the axis of the tube body by a simple operation of installing the axis position specifying jig in the tube body and moving the moving member along the center axis and fixing it to the center axis. be able to.

  The mounting hole ruler method using the axial center position specifying jig according to the present invention includes arranging the axial center position specifying jig according to any one of claims 8 to 10 in the pipe body, and moving the moving member to the central axis. The corresponding one arm and each other arm are rotated by the same angle with respect to the central axis, and the respective receiving members are abutted against the peripheral surface of the tubular body at intervals in the circumferential direction. Is fixed to the central axis, and the central axis is arranged at the center of the tube body, and then a mounting hole ruler is created in which a plurality of mounting holes are formed at intervals in the circumferential direction on the circumference centered on the central axis. Attaching the tool to the central axis, applying it to the surface of the wall to which the tube is connected, and marking the mounting holes on the surface of the wall using the mounting holes of the mounting hole marking tool It is what.

  According to the present invention, the one axial arm and the corresponding other arm are arranged by disposing the axial center position specifying jig in the tube and moving the moving member along the central axis so as to reduce the distance from the fixed member. Are rotated in the upright direction at the same angle with respect to the central axis, and the receiving members are respectively brought into contact with the circumferential surface of the tubular body at intervals in the circumferential direction. Next, when the moving member is fixed to the central axis in a state where each receiving member is abutted against the peripheral surface of the tubular body, it can be fixed to the tubular body. After that, by attaching a mounting hole marking tool to the central axis, the mounting hole can be scored using the mounting hole on the surface of the wall body to which the tubular body is connected.

  In this case, the plurality of receiving members of the axial center position specifying jig abutted on the inner peripheral surface of the tubular body at intervals in the circumferential direction are supported by the one arm and the other arm having the same length. Therefore, the distance from the receiving surface of each receiving member to the central axis is the same, and the central axis is arranged at the axial center of the tube. On the other hand, since the mounting holes of the mounting hole marking tool mounted on the central axis are formed on the circumference centered on the central axis, the mounting holes marked on the surface of the wall body are It is located on the circumference centered on the body axis.

  As a result, the mounting hole marking tool is attached to the central axis of the axial center specifying jig fixed to the tube, so that the mounting hole located on the circumference centering on the axis of the tube is piped. It is possible to easily draw a ruled surface on the surface of the wall body to which the body is connected.

  According to the tube axis position specifying jig and the tube position determining method using the axis position specifying jig of the present invention, it is possible to easily and reliably specify the axis of a tube body such as an existing pipe. it can. Therefore, it is possible to obtain the three-dimensional coordinates required when performing various constructions around the axial center position with the specified axial center position of the tubular body as the origin.

  In addition, the axial center position specifying jig of the present invention as an example of a method for obtaining the three-dimensional coordinates required when performing various constructions around the axial center position with the specified axial position of the tubular body as the origin. According to the mounting hole marking method used, the mounting holes located on the circumference centered on the axis of the tube body can be easily ruled on the surface of the wall body to which the tube body is connected.

It is a side view which abbreviate | omits and shows one Embodiment of the axial center position specific jig | tool of the tubular body of this invention. It is a front view of the axial center position specific jig | tool of FIG. It is a side view which shows the state which fixed the axial center position specific jig | tool of FIG. 1 to the existing pipe | tube. FIG. 2 is a front view and a side view of a mounting hole ruler jig that can be mounted on the axial center position specifying jig of the tubular body of FIG. 1. It is a side view which abbreviate | omits and partially shows other embodiment of the axial center position specific jig | tool of the tubular body of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show an embodiment of an axial center position specifying jig 1 of a tubular body such as an existing pipe or a rehabilitated pipe according to the present invention.

  This axial center position specifying jig 1 has a distal end side substantially half portion formed on the male screw 21a and a base end side substantially half portion formed on the cylindrical surface 22a, and a circumferential interval of 90 degrees. The four connecting portions 31 are formed and screw-coupled to the male screw 21a of the central shaft 2 and the four cross-shaped nut members 3 as viewed from the front and four at 90 ° intervals in the circumferential direction. Are formed on the cylindrical surface 22a of the central shaft 2 and are rotatably supported by the cylindrical bearing member 4 as viewed from the front. A pair of four front arms 5 that are rotatably connected and four rear arms 6 whose base ends are rotatably connected to the connecting portions 41 of the bearing member 4 are formed. Corresponding front end portions of the front arms 5 and front end portions of the rear arms 6 are rotatably connected to each other. And a four receiving member 7 for that.

  1 and 3, only the upper and lower front arms 5, the rear arm 6, and the receiving member 7 are shown for easy understanding of the drawings, and the direction perpendicular to the paper surface (the left-right direction in FIG. 2). The left and right front arms 5, rear arm 6, and receiving member 7 are omitted.

  The central shaft 2 is formed by integrally connecting a screw shaft 21 formed with a male screw 21 a and a rotating shaft 22 formed on the cylindrical surface 22 a via a shaft coupling 23. A nut member 3 formed with a female screw corresponding to the male screw 21 a is screwed to the screw shaft 21 of the central shaft 2. A bearing member 4 whose front and rear are axially positioned via a thrust bearing 24 is rotatably supported on a rotating shaft 22 of the central shaft 2 via a bearing (not shown).

  On the other hand, the base end portions of the four front arms 5 are rotatably connected to the four connecting portions 31 of the nut member 3 via pins. Similarly, the base end portions of the four rear arms 6 are rotatably connected to the four connecting portions 41 of the bearing member 4 via pins. And the front-end | tip part of each front arm 5 and the front-end | tip part of each rear arm 6 are connected with each corresponding receiving member 7 via the pin so that rotation is possible respectively.

  The four front arms 5 and the four rear arms 6 have the same length, and gear portions 51 and 61 that mesh with each other are formed at the tip portions thereof.

  Each receiving member 7 has a receiving surface 71 parallel to the central axis of the central shaft 2, and the receiving arm 71 of each receiving member 7 is rotated by each front arm 5 and each rear arm 6. Thus, the center axis 2 can be moved between the enlarged diameter position and the reduced diameter position. That is, each front arm 5 and each rear arm 6 corresponding to each other are connected to each connecting portion 31 and each receiving member of the nut member 3 so as to form an equiangular trapezoidal leg whose angle with the central axis 2 is less than 90 degrees. 7 and are connected to each connecting portion 41 of the bearing member 4 and each receiving member 7. Specifically, the pin connection point of each front arm 5 to each connecting portion 31 and each receiving member 7 of the nut member 3, and the pin connection of each rear arm 6 to each connecting portion 41 and each receiving member 7 of the bearing member 4. The points are set to form an isometric trapezoid.

  As shown in FIG. 4, the mounting hole ruler jig 10 is formed in an annular shape by rubber or flexible plastic, and a plurality of mounting holes 10a are formed on the circumference at intervals in the circumferential direction. The connecting member 102 is disposed on the ruled member 101 on the diameter thereof, and has a guide 1021 having an inner diameter corresponding to the outer diameter of the rotary shaft 22 of the central shaft 2 described above at the center of the ruled member 101. Are integrally connected. Accordingly, by inserting the guide 1021 of the connecting member 102 in the mounting hole ruler jig 10 into the rotation shaft 22 of the central shaft 2, a plurality of pieces positioned on the circumference of the specific radius centered on the central shaft 2. The attachment holes can be drawn using the attachment holes 10a of the drawing member 101. For example, the mounting hole scribing jig 10 is mounted on the rotation shaft 22 of the central shaft 2, and the scoring member 101 is applied to the inner wall surface of the manhole M and sprayed with a colored spray toward the mounting hole 10a. A plurality of colored small circles corresponding to the mounting holes 10a formed in the drawing member 101 can be marked on the inner wall surface.

  In this case, the mounting hole 10a group is positioned on the circumference of a plurality of different radii on the marking member 101 of the mounting hole marking jig 10 so as to correspond to different pipe diameters such as the existing pipe S, and the mounting holes 10a are arranged in the circumferential direction. Further, the scoring member 101 is configured to be separable from the connecting member 102 using a bolt and nut or the like, and a mounting hole 10a located on the circumference of a different radius is formed. A plurality of ruled members 101 may be prepared, and the necessary ruled members 101 may be selected and connected to the connecting material 102.

  Next, the axial position of the tube, for example, the existing pipe S, is specified using the axial position specifying jig 1 configured as described above, and the inner wall surface of the manhole M to which the existing pipe S is connected, A construction procedure for marking a plurality of mounting holes on the circumference centered on the axis of the existing pipe S will be described below.

  First, in the manhole M to which the water stop member is attached, the axial center position specifying jig 1 is inserted into the existing pipe S, and the rotation shaft 22 of the central shaft 2 is partially protruded into the manhole M at the bottom of the pipe. Deploy. Next, the rotating shaft 22, that is, the central shaft 2 is rotated forward using a crank or the like. When the central shaft 2 is rotated, the screw shaft 21 is also rotated, and the nut member 3 screwed to the screw shaft 21 is moved to the near side, and the distance from the bearing member 4 is reduced. As a result, the four front arms 5 connected to the nut member 3 rotate in a direction to stand up with respect to the central shaft 2. When the front arm 5 rotates, the gear portion 51 formed at the tip thereof relatively rotates, so that the gear portion 61 that meshes with the gear portion 51 also rotates in the opposite direction by the same amount. The rear arm 6 is also forcibly rotated in the direction to stand up with respect to the central axis 2 by the same amount as the front arm 5. For this reason, in a state where at least one receiving member 7 is supported on the tube bottom portion of the existing pipe S, each receiving member 7 gradually moves in the diameter increasing direction away from the central axis 2. At this time, since each front arm 5 and each rear arm 6 have the same length, the central axis 2 and the corresponding four sets of front arms 5, rear arms 6 and receiving members 7 respectively form a pantograph mechanism, The receiving member 7 moves in the diameter increasing direction away from the central axis 2 while maintaining the receiving surface 71 parallel to the axis of the central axis 2. Each receiving member 7 that gradually moves in the diameter expansion direction finally hits the inner peripheral surface of the existing pipe S at an interval of 90 degrees in the circumferential direction, and further movement is prevented.

  Here, the four receiving members 7 of the axial center position specifying jig 1 abutted on the inner peripheral surface of the existing pipe S at intervals in the circumferential direction are the front arm 5 and the rear arm respectively having the same length. 6, the distance from the receiving surface 71 of each receiving member 7 to the central axis 2 is the same, and the central axis 2 is disposed at the axis of the existing pipe S.

  Next, the guide 1021 of the connecting member 102 in the mounting hole marking jig 10 is inserted through the rotary shaft 22 protruding into the manhole M in the central axis 2 of the axial center position specifying jig 1 fixed to the existing pipe S. If the marking member 101 is applied to the inner wall surface of the manhole M (see FIG. 3), a plurality of mounting holes located on the circumference of a specific radius centered on the central axis 2 are drawn on the inner wall surface. Can do. For example, it is possible to mark a position corresponding to the mounting hole 10a by spraying colored spray from the surface side of the ruled member 101 through the mounting hole 10a or driving a chisel through the mounting hole 10a. Thereafter, a mounting hole can be formed in accordance with the markings marked on the inner wall surface of the manhole M, and the center of the water-stopping member is made to coincide with the axis of the existing pipe S using the formed mounting hole. Can be fixed with anchor bolts.

  When the mounting hole scoring operation is completed, the mounting hole scoring jig 10 is detached from the central axis 2 of the shaft center position specifying jig 1, and then the rotating shaft 22 is rotated in the reverse direction, so that Conversely, the nut member 3 is moved forward away from the bearing member 4, and the receiving members 7 are moved in the direction of diameter reduction approaching the central shaft 2 via the front arms 5 and the rear arms 6. be able to. Thereby, the contact of the receiving member 7 with the existing pipe S is eliminated, and the axial center position specifying jig 1 can be drawn from the existing pipe S into the manhole M.

  In this way, the center axis position specifying jig 1 is installed in the existing pipe S, and the center axis 2 can be reliably arranged on the axis of the existing pipe S by a simple operation of rotating the center axis 2. it can.

  Further, the axial center specifying jig 1 is arranged on the existing pipe S with the axis of the existing pipe S and the axis of the central axis 2 aligned, and the mounting hole marking jig 10 is attached to the central axis 2. Accordingly, it is possible to easily draw a ruled attachment hole located on the circumference of a specific radius centered on the axis of the existing pipe S on the inner surface of the peripheral wall of the manhole M to which the existing pipe S is connected.

  By the way, in the above-described embodiment, the nut member 3 is moved along the central axis 2 by rotating the central shaft 2, and the corresponding front arm 5 and the rear arm 6 are interlocked to each other to receive each member 7. However, the base end side connecting portion of each front arm 5 may be moved along the central axis 2 without rotating the central axis 2.

  Hereinafter, another embodiment of such an axial center position specifying jig 1 will be described with reference to FIG.

  In addition, the same member as the axial center position specifying jig 1 of the embodiment described above is denoted by the same reference numeral, and detailed description thereof is omitted.

  The axial center position specifying jig 1 of this embodiment has a central axis 2 and four connecting portions 81 formed at intervals of 90 degrees in the circumferential direction, and is fixed to the distal end portion of the central axis 2. A cross-shaped fixing member 8 when viewed from the front and four connecting portions 91 are formed at intervals of 90 degrees in the circumferential direction, and are slidably fitted along the central axis 2 as viewed from the front. A cross-shaped moving member 9, four front arms 5 each having a base end rotatably connected to each connecting portion 81 of the fixing member 8 via a pin, and each connecting portion 91 of the moving member 9. The four rear arms 6 whose base end portions are pivotally connected to each other via pins, the front end portions of the front arms 5 and the front end portions of the rear arms 6 corresponding to form a pair, respectively. It is comprised from the four receiving members 7 connected rotatably through the pin.

  The central shaft 2 is formed by integrally connecting front and rear support shafts 25 formed on a cylindrical surface via a shaft joint 23, and a key groove is formed at a base end portion of the front support shaft 25 over a set length. 25a is formed. The moving member 9 has a boss portion 92 in addition to the four connecting portions 91, and a key 93 corresponding to the key groove 25 a of the front support shaft 25 in the central shaft 2 is pivoted on the inner peripheral surface thereof. It is fixed along the direction of the heart. The moving member 9 is inserted into the front support shaft 25 with the key 93 aligned with the key groove 25a. Further, the boss portion 92 of the moving member 9 is formed with a female screw capable of being screw-coupled to the female screw 94, and the moving member is formed by screwing the female screw 94 to the female screw formed on the boss portion 92 of the moving member 9. 9 can be fixed so as not to move to the front support shaft 25 in the central shaft 2.

  The female screw of the boss portion 92 of the moving member 9 is formed at a position away from the key groove 25a of the support shaft 25 in the circumferential direction, and the female screw 94 screwed to the female screw is a key of the support shaft 25. It abuts on the outer peripheral surface other than the groove 25a.

  The axial center position specifying jig 1 configured in this way is also inserted into the existing pipe S, and is arranged at the bottom of the pipe so that the support shaft 25 behind the central axis 2 partially protrudes into the manhole M. Next, in a state where the rear support shaft 25 is grasped with one hand, if the moving member 9 is pushed forward, the moving member 9 is fitted with the key groove 25a of the front support shaft 25. As a result, the key 93 is guided in the key groove 25 a, and the moving member 9 moves forward along the support shaft 25 to reduce the distance from the fixed member 8. As a result, the four rear arms 6 connected to the moving member 9 are rotated in the direction in which they stand up with respect to the central axis 2. When the front arm 6 rotates, the gear portion 61 formed at the tip thereof relatively rotates, so that the gear portion 51 that meshes with the gear portion 61 is also forcibly rotated in the opposite direction by the same amount. Eventually, the front arm 5 is also forcibly rotated in the direction to stand up with respect to the central axis 2 by the same amount as the rear arm 6. For this reason, in a state where at least one receiving member 7 is supported on the tube bottom portion of the existing pipe S, each receiving member 7 gradually moves in the diameter increasing direction away from the central axis 2. At this time, since each front arm 5 and each rear arm 6 have the same length, the central axis 2 and the corresponding four sets of front arms 5, rear arms 6 and receiving members 7 respectively form a pantograph mechanism, The receiving member 7 moves in the diameter increasing direction away from the central axis 2 while maintaining the receiving surface 71 parallel to the axis of the central axis 2 and finally 90 degrees in the circumferential direction on the inner peripheral surface of the existing pipe S. At this interval, it is stopped and further movement is prevented.

  If the four receiving members 7 are abutted against the inner peripheral surface of the existing pipe S, the female screw 94 previously screwed to the female screw of the boss 92 is supported in a state where the moving member 9 is supported so as not to move. When tightened, the tip of the front end abuts against the outer peripheral surface of the front support shaft 25, and the moving member 9 can be fixed so as not to move with respect to the support shaft 25.

  At this time, since the four receiving members 7 of the axial center position specifying jig 1 fixed to the existing pipe S are supported by the front arms 5 and the rear arms 6 having the same length, the receiving members 7, the distance from the receiving surface 71 to the central axis 2 becomes the same, and the central axis 2 is arranged at the axis of the existing pipe S.

  Next, the guide 1021 of the connecting member 102 in the mounting hole marking jig 10 is attached to the rear support shaft 25 protruding into the manhole M in the central axis 2 of the axial center position specifying jig 1 fixed to the existing pipe S. If the ruled member 101 is inserted and applied to the inner wall surface of the manhole M, a plurality of mounting holes positioned on the circumference of a specific radius centered on the central axis 2 can be drawn on the inner wall surface.

  When the mounting hole marking is completed, the mounting hole marking jig 10 is detached from the central axis 2 of the shaft center position specifying jig 1 and then the loose screw 94 is loosened, so that the support shaft of the moving member 9 is supported. 25 can be released. Next, contrary to the above, if the moving member 9 is retracted to the near side, each receiving member 7 moves in a reduced diameter direction approaching the central axis 2 via each front arm 5 and each rear arm 6, The contact of each receiving member 7 with the existing pipe S can be eliminated, and the axial center position specifying jig 1 can be pulled out from the existing pipe S into the manhole M.

  As described above, the center axis 2 is reliably arranged on the axis of the existing pipe S by a simple operation of installing the axis position specifying jig 1 in the existing pipe S, pushing the moving member 9 and tightening the tube screw 94. be able to.

  Further, by placing the axial center position specifying jig 1 on the existing pipe S so that the axis center of the existing pipe S and the central axis of the central axis 2 coincide with each other, the mounting hole ruler jig 10 is provided on the central axis 2. The mounting holes located on the circumference of the specific radius centered on the axis of the existing pipe S can be easily drawn on the inner surface of the peripheral wall of the manhole M to which the existing pipe S is connected.

  In the above-described embodiment, the case where four sets of the front arm 5, the rear arm 6 and the receiving member 7 are provided at an interval of 90 degrees with respect to the circumferential direction of the central axis 2 has been described. Any number may be used, and the number is not limited.

  Further, since the flexible scribing member 101 can be adapted to the shape of the wall surface of the manhole, the manhole M has a flat wall surface even if the wall surface is an on-site assembly manhole having an arc shape when viewed from above. It can be on-site manhole.

  Furthermore, the tube body for which the axis is obtained is not limited to an existing tube, but may be a rehabilitated tube. In this case, the method for forming the rehabilitation tube is not particularly limited. For example, it may be a rehabilitation pipe formed by a reversal method such as fiber reinforced plastic or a forming method.

DESCRIPTION OF SYMBOLS 1 Axis center position specifying jig 2 Center shaft 21 Screw shaft 21a Male screw 22 Rotating shaft 25 Support shaft 3 Nut member 4 Bearing member 5 Front arm 6 Rear arm 7 Receiving member 71 Receiving surface 8 Fixed member 9 Moving member 10 Mounting hole ruler Jig 10a Mounting hole M Manhole S Existing pipe

Claims (13)

  A central shaft having a male screw, a nut member having a female screw corresponding to the male screw of the central shaft and screwed to the central shaft, a bearing member rotatably supported by the central shaft, and a circumferential spacing between the nut members A plurality of one arms each having a base end portion rotatably connected thereto, a plurality of other arms each having a base end portion rotatably connected to the bearing member in a circumferential direction, The front end of one arm and the front end of each other arm are each composed of a plurality of receiving members that are pivotably connected. Each one arm and each other arm are formed to have the same length. Each having a receiving surface parallel to the axis of the central axis, and rotating the corresponding one arm and the other arm through the movement of the nut member by the rotation of the central axis by the same angle with respect to the central axis, Each receiving member Axial localization fixture circumferentially abut each spaced and wherein placing the central axis tube of axis tubular body.   The axial center position specifying jig of a tubular body according to claim 1, wherein each of the corresponding one arm and each other arm forms an equiangular trapezoidal leg whose angle with the central axis is less than 90 degrees. A tube axis position specifying jig characterized by   The axial center position specifying jig for a tubular body according to claim 1 or 2, wherein the bearing member is positioned on a central axis via a thrust bearing.   The axial center position specifying jig for a tubular body according to any one of claims 1 to 3, wherein gears that mesh with each other are provided at the tip of each corresponding one arm and the tip of each other arm. The axial center position specifying jig of the tube.   The tube body axis position specifying jig according to any one of claims 1 to 4, wherein a plurality of attachments are provided on the central axis at intervals in a circumferential direction on a circumference centered on the central axis. An axial center position identifying jig for a tubular body, wherein a mounting hole ruler jig having holes formed therein is detachably attached thereto.   The axial center position specifying jig according to any one of claims 1 to 4 is arranged in a pipe body, a central shaft is rotated to move a nut member, and the corresponding one arm and each other arm are connected to the central shaft. The center position is determined by rotating the same angle relative to each other, abutting each receiving member against the circumferential surface of the tubular body at intervals in the circumferential direction, and placing the central axis at the axial center of the tubular body A method for specifying the axial center position of a tube using a jig.   The axial center position specifying jig according to any one of claims 1 to 4 is arranged in a pipe body, a central shaft is rotated to move a nut member, and the corresponding one arm and each other arm are connected to the central shaft. Are rotated at the same angle with respect to each other, and each receiving member is abutted against the circumferential surface of the tubular body at a distance in the circumferential direction so that the central axis is arranged at the axial center of the tubular body, and then a circle around the central axis A mounting hole marking tool with a plurality of mounting holes formed at intervals in the circumferential direction on the circumference is attached to the center axis and applied to the surface of the wall body to which the tube is connected, and the mounting hole marking tool is repaired. A mounting hole marking method using an axial center position specifying jig, wherein a plurality of mounting holes are scored on the surface of a wall body using the mounting holes of the tool.   A central axis, a movable member that is slidably inserted along the central axis, a fixed member that is fixed to the central axis, and a base end that is pivotally connected to the movable member at intervals in the circumferential direction. A plurality of one arms, a plurality of other arms each having a base end pivotably connected to the fixing member at intervals in the circumferential direction, a distal end portion of each one arm, and a distal end portion of each other arm. Each arm is composed of a plurality of receiving members that are pivotably connected. Each arm and each other arm are formed to have the same length, and each receiving member has a receiving surface parallel to the axis of the central axis. Then, the movable member is moved along the central axis, and the corresponding one arm and the other arm are respectively rotated by the same angle with respect to the central axis, and the receiving members are spaced circumferentially on the peripheral surface of the tubular body. And the moving member is fixed to the central axis. Axial localization fixture of the tubular body, characterized by arranging the central axis tube the axis Te.   9. The tube axis position specifying jig according to claim 8, wherein each of the corresponding one arm and each other arm forms an equiangular trapezoidal leg having an angle of less than 90 degrees with the central axis. An axial center position specifying jig for a tubular body.   The tubular body axis position specifying jig according to claim 8 or 9, wherein a gear that meshes with each other is provided at a tip portion of each corresponding one arm and a tip portion of each other arm. Axial position specifying jig.   11. The tubular body axis position specifying jig according to claim 8, wherein a plurality of attachments are provided on the central axis at intervals in a circumferential direction on a circumference centered on the central axis. An axial center position identifying jig for a tubular body, wherein a mounting hole ruler jig having holes formed therein is detachably attached thereto.   An axial center specifying jig according to any one of claims 8 to 10 is arranged in a pipe body, and the corresponding one arm and each other arm are moved along the central axis by moving the moving member along the central axis. Rotate the same angle with respect to each other, abut each receiving member on the circumferential surface of the tubular body at intervals in the circumferential direction, fix the moving member to the central axis, and place the central axis at the axial center of the tubular body A tube axis position specifying method using an axis position specifying jig characterized by the above.   An axial center specifying jig according to any one of claims 8 to 10 is arranged in a pipe body, and the corresponding one arm and each other arm are moved along the central axis by moving the moving member along the central axis. After rotating the same angle to each other, abutting each receiving member on the circumferential surface of the tubular body at a circumferential interval, fixing the moving member to the central axis, and placing the central axis at the axial center of the tubular body The surface of the wall body to which a tube hole is attached and a mounting hole marking tool in which a plurality of mounting holes are formed at intervals in the circumferential direction on the circumference centered on the central axis is attached to the central axis A mounting hole marking method using an axial center position specifying jig characterized in that a plurality of mounting holes are ruled on the surface of the wall body using the mounting holes of the mounting hole marking jig.

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