JP6536292B2 - Screw tightening device and method of manufacturing pipe connector - Google Patents

Description

  The present invention relates to a screw tightening device for screwing male and female screw portions respectively provided at ends of a pair of tubes arranged in an axial direction, and relates to a method for manufacturing a pipe connector using the screw tightening device.

  Patent Document 1 discloses an apparatus for tightening an external thread portion provided at an end of one steel pipe to an internal thread portion provided at an end of the other steel pipe. This device comprises a traction device and a cord-like body which is unwound from the traction device and wound around the outer circumferential surface of one steel pipe. One of the steel pipes is rotated by winding the cord-like body by the pulling device, and thereby the male screw portion and the female screw portion are screwed together.

JP, 2013-174088, A

  By the way, since the weight of the steel pipe is large and the friction between the male screw part and the female screw part is large, a large torque is required to rotate the steel pipe. However, in the device described in Patent Document 1, since the cord-like body is wound around the outer circumference of the steel pipe, the torque given to the steel pipe is the product of the traction force of the traction device and the radius of the steel pipe. I had to increase the traction of the traction device. When the pulling force of the pulling device is increased, the pulling device becomes large. Therefore, when the work space around the steel pipe is narrow, it is difficult for the workers to work and it is difficult to increase the number of workers.

  The present invention has been made in view of the above circumstances. The problem to be solved by the present invention is to make it possible to force-tighten the pipes provided at the ends provided with the male screw part and the female screw part respectively.

  In order to solve the above problems, a screw tightening device for screwing a male screw portion and a female screw portion respectively provided at ends of a pair of tubes arranged in the axial direction encloses one of the pair of tubes. A guide provided annularly, a traveling body capable of traveling along the guide, a torque applying portion extending from the traveling body to the other pipe side along the axial direction, and an outer peripheral surface of the one pipe And a torque receiving portion for receiving torque from the torque applying portion along with traveling of the traveling body.

  In the method of manufacturing a connected body of the pipes by screwing a male screw part and a female screw part to ends of a pair of pipes arranged in the axial direction, one of the pipes is surrounded. By causing the traveling body to travel along the guide provided annularly, from the torque applying portion extending from the traveling body to the other pipe side along the axial direction, the radial direction from the outer peripheral surface of the one pipe Torque is applied to the torque receiving portion extended to rotate the one pipe, and the male screw portion and the female screw portion are screwed.

  According to the present invention, the guide is provided so as to surround one of the tubes, the diameter of the guide is larger than the diameter of the tube, and the torque receiving portion extends radially outward from the outer peripheral surface of the tube A large torque can be applied to one of the tubes by the traveling force of the traveling body. Therefore, the male screw portion and the female screw portion can be screwed in a power-saving manner, and the number of workers for the screw tightening operation can be reduced. If the number of workers is small, it is easy for workers to work even if the work space around the pipe is narrow.

It is an elevation view showing a screw fastening device and a pipe connector. It is the perspective view which expanded and showed the upper part of the screw fastening apparatus. It is an elevation view for demonstrating the connection process of a pipe | tube. It is an elevation view for demonstrating the connection process of a pipe | tube. It is an elevation view for demonstrating the connection process of a pipe | tube.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, since the embodiments described below are subject to various technically preferable limitations for practicing the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is an elevational view showing a screw tightening device 20 together with a steel pipe connector 10.

  As shown in FIG. 1, a hole 2 is drilled in the ground 1, and a stabilizer 3 is filled in the hole 2. The steel pipe connector 10 is inserted into the hole 2 and immersed in the stabilizer 3. The steel pipe connector 10 has a plurality of steel pipes 11 axially connected. Each steel pipe 11 has a steel pipe body 12, a cylindrical female screw 13 provided at the upper end of the steel pipe body 12, and a cylindrical male screw 14 provided at the lower end of the steel pipe body 12. The outer peripheral surface of the cylindrical female screw 13 is provided flush with the outer peripheral surface of the steel pipe main body 12, and a female screw is formed on the inner peripheral surface of the cylindrical female screw 13. The outer diameter of the cylindrical male screw portion 14 is shorter than the outer diameters of the cylindrical female screw portion 13 and the steel pipe main body 12, and a male screw is formed on the outer peripheral surface of the cylindrical male screw portion 14. The steel pipes 11 and 11 are connected by screwing the cylindrical male screw portion 14 of the steel pipe 11 with the cylindrical female screw portion 13 of the steel pipe 11 adjacent to the lower side thereof. The steel pipe 11 is a large diameter steel pipe having a diameter of, for example, 1500 mm, and a large torque is required when tightening the cylindrical female screw portion 13 and the cylindrical female screw portion 14 of the pair of steel pipes 11 and 11, so the torque is generated The screwing device 20 is used for this purpose. The cylindrical male screw portion 14 and the steel pipe main body portion 12 may be integrally formed, or the cylindrical male screw portion 14 may be assembled to the steel pipe main body portion 12. The same applies to the cylindrical female screw 13 and the steel pipe main body 12.

  FIG. 2 is a perspective view of the main part of the screw tightening device 20. As shown in FIG. The screw tightening device 20 is a device for tightening the cylindrical male screw portion 14 of the rear steel pipe 11 not inserted into the hole 2 into the cylindrical female screw portion 13 of the preceding steel pipe 11 inserted into the hole 2. Hereinafter, the configuration of the screw tightening device 20 will be described in detail.

  As shown in FIG. 1 and FIG. 2, the screw tightening device 20 is provided with a holder 21, a plurality of columns 22, a guide 24, a plurality of (for example, 2 machines) traveling bodies 25 and a plurality (for example 2) A portion 26 and a plurality of (for example, two) torque receivers 27 are provided.

  The holder 21 is provided on the ground 1 so as to surround the hole 2. The preceding steel pipe 11 inserted in the hole 2 is held by the holder 21 on the inner peripheral surface thereof, and movements of the steel pipe 11 in the circumferential direction, axial direction (especially downward) and radial direction are restrained by the holder 21. Hereinafter, the preceding steel pipe 11 held by the holder 21 is referred to as a fixed steel pipe 11.

  A plurality of columns 22 are erected at circumferentially spaced intervals around the hole 2 on the ground 1. The proximal end of an arm 23 extending radially inward from the top of the column 22 is connected to the top of the column 22. The arms 23 are radially arranged, and a ring-shaped guide 24 having a diameter larger than that of the steel pipe 11 is connected to the tip of the arms 23. Since the guide 24 is installed upward away from the ground, a working space can be secured below the guide 24. The guide 24 is a rail of I-shaped cross section.

  A plurality of traveling bodies 25 are attached to the guide 24, and the traveling bodies 25 travel along the guides 24. The traveling body 25 is a geared trolley, and when the hand chain 25 a of the traveling body 25 is pulled and orbits, the rotational force is transmitted to the wheels 25 b of the traveling body 25 by the gear reduction mechanism of the traveling body 25. 25 travel along the guide 24.

  The upper end of a rod-like torque applying portion 26 is connected to the traveling body 25, and the torque applying portion 26 is suspended from the traveling body 25 in the vertical direction. On the other hand, at the lower part of the outer peripheral surface of the steel pipe main body 12 of the steel pipe 11 (hereinafter referred to as the rotary steel pipe 11) connected with the fixed steel pipe 11 by the screw tightening device 20 At fixed intervals (for example, magnets, fixed bands). The torque receiving portion 27 extends radially outward from the outer peripheral surface of the steel pipe main body 12. When the torque applying unit 26 and the torque receiving unit 27 abut each other, the torque applying unit 26 and the torque receiving unit 27 generate torque on the rotary steel pipe 11 according to the traveling of the traveling body 25.

Then, the method to manufacture the steel pipe connection body 10 using the screw fastening apparatus 20 is demonstrated.
First, the hole 2 is excavated in the ground 1, and the stabilizer 3 is supplied into the hole 2.
Next, a screwing device 20 (but excluding the torque receiver 27) is assembled around the hole 2 on the ground 1.
Next, the preceding fixed steel pipe 11 is lifted by a crane or the like, and the fixed steel pipe 11 is inserted into the inside of the hole 2 and the holder 21. Then, the upper portion of the fixed steel pipe 11 is protruded upward from the hole 2, and the fixed steel pipe 11 is held by the holder 21.

Next, as shown in FIG. 3, the rear rotating steel pipe 11 is lifted by a crane or the like, and the rotary steel pipe 11 is lowered from above the guide 24 to the inside of the guide 24. The lower end of 14 is fitted to the upper end of the cylindrical internal thread 13 of the fixed steel pipe 11. Since the rotary steel pipe 11 was suspended, when fitting the lower end of the cylindrical male screw portion 14 of the rotary steel pipe 11 to the upper end of the cylindrical female screw portion 13 of the fixed steel pipe 11, axial alignment of the rotary steel pipe 11 and the fixed steel pipe 11 Easy to do.
Next, as shown in FIG. 4, the torque receiver 27 is attached to the lower portion of the outer peripheral surface of the steel pipe main body 12 of the rotary steel pipe 11.

Next, in a state where the rotary steel pipe 11 is suspended by a crane or the like, the traveling body 25 is made to travel along the guide 24 by pulling the hand chain 25a, and the torque applying portion 26 is brought into contact with the torque receiving portion 27. Here, when the cylindrical male screw portion 14 is a right-handed screw, the traveling body 25 is caused to travel clockwise as viewed from above, and when the cylindrical male screw portion 14 is a left-handed screw, the traveling body is viewed from above Run 25 in a counterclockwise direction.
As shown in FIG. 5, the traveling body 25 continues to travel even after contact between the torque applying portion 26 and the torque receiving portion 27, and the torque applying portion 26 pushes and moves the torque receiving portion 27 to travel the traveling body 25. Torque is applied from the torque application unit 26 to the torque receiver 27 and the rotary steel pipe 11. By doing so, the rotary steel pipe 11 is rotated, and the cylindrical male screw portion 14 of the rotary steel pipe 11 is screwed to the cylindrical female screw portion 13 of the fixed steel pipe 11. Since the rotary steel pipe 11 is suspended, the posture of the rotary steel pipe 11 is stabilized by gravity, and the cylindrical male screw 14 of the rotary steel pipe 11 and the cylindrical female screw 13 of the fixed steel pipe 11 can be easily tightened. Further, if the torque receiving portions 27 are arranged at equal intervals in the circumferential direction, the rotary steel pipe 11 can be stably rotated, and the cylindrical male screw portion 14 of the rotary steel pipe 11 and the cylindrical female screw portion of the fixed steel pipe 11 Easy to tighten 13 By tightening the cylindrical male screw 14 of the rotary steel pipe 11 and the cylindrical female screw 13 of the fixed steel pipe 11, the rotary steel pipe 11 descends, and the torque receiver 27 slides downward along the torque applying part 26 accordingly. Since the torque applying portion 26 extends straight up and down, the contact state between the torque receiving portion 27 and the torque applying portion 26 is maintained even if the rotary steel pipe 11 and the torque receiving portion 27 descend due to the screw tightening. be able to.

  Since the traveling body 25 is a geared trolley having a gear reduction mechanism, the tensile force of the hand chain 25a is converted into a large traveling force of the traveling body 25 by the gear reduction mechanism. Then, since the diameter of the guide 24 is larger than the diameter of the steel pipe 11, a large torque can be applied to the rotary steel pipe 11. Therefore, even if the number of workers is small and the tensile force of the hand chain 25a by the workers is weak, the cylindrical male screw portion 14 of the rotary steel pipe 11 can be tightened to the cylindrical female screw portion 13 of the fixed steel pipe 11. If the rotating work of the rotary steel pipe 11 is performed by a small number of people, workers do not collide with each other even in a narrow work space, and the safety of the workers is improved.

  Since the diameter of the guide 24 is larger than the diameter of the steel pipe 11 and the traveling body 25 can be traveled by the hand chain 25a, the worker may rotate the rotary steel pipe 11 away from the rotary steel pipe 11 radially outward. it can. Therefore, the worker can work safely.

  When the tightening of the cylindrical male screw portion 14 of the rotary steel pipe 11 and the cylindrical female screw portion 13 of the fixed steel pipe 11 using the screw tightening device 20 is completed, the torque receiver 27 is removed from the rotary steel pipe 11. Next, the cylindrical male screw portion 14 of the rotary steel pipe 11 and the cylindrical female screw portion 13 of the fixed steel pipe 11 are fully tightened. In addition, if the cylindrical male screw portion 14 of the rotary steel pipe 11 and the cylindrical female screw portion 13 of the fixed steel pipe 11 are fully tightened using the screw tightening device 20, it is not necessary to separately perform full tightening.

  Next, the holding of the preceding fixed steel pipe 11 (the second steel pipe 11 from the top) by the holder 21 is released. Then, after the connected body of the steel pipes 11 and 11 is lowered by a crane and made to enter the hole 2, the steel pipe 11 at the uppermost stage is held by the holder 21. Thereafter, in the same manner as described above, a new rotary steel pipe 11 is connected to the uppermost steel pipe 11 using the screw tightening device 20. Thereafter, the steel pipe connecting body 10 in which a desired number of steel pipes 11 are connected is completed by repeatedly performing holding release by the holding tool 21, entry of the steel pipe joint body, and connection of a new rotary steel pipe 11. This steel pipe connection body 10 is used, for example, as a backlashing support in a subsequent backwashing method.

  As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention also includes the equivalents thereof. The changes from the above embodiment will be described below. The modifications described below may be applied in combination as much as possible.

(1) In the embodiment described above, the steel pipe 11 may be changed to a metal pipe other than steel, or may be changed to a pipe other than metal (for example, a porcelain pipe).

(2) In the above embodiment, the traveling body 25 is a geared trolley, but it may be a plain trolley not having a gear reduction mechanism, or the motor shaft is connected to the gear reduction mechanism, and the motor It may be an electric trolley that drives the wheels 25b.

(3) In the above-mentioned embodiment, although screwing device 20 was vertical, screwing device 20 may be horizontal. When the screw tightening device 20 is a horizontal type, the support 22 and the arm 23 are not adopted, and the holder 21 and the guide 24 are supported by the support member in the erected state, and the holder 21 and the guide 24 are arranged side by side. There is. The holder 21 is provided with a pipe support for supporting the fixed steel pipe 11 which has fallen to the side. Further, the guide 24 is attached with a pipe guide portion which slidably supports the rotary steel pipe 11 which has fallen to the side. Moreover, it is preferable that the traveling body 25 be an electric type.

(4) In the above embodiment, by rotating the rotary steel pipe 11 using the screw tightening device 20, the cylindrical male screw portion 14 of the rotary steel pipe 11 is screwed to the cylindrical female screw portion 13 of the fixed steel pipe 11. The cylindrical female screw portion 13 of the rotary steel pipe 11 may be screwed to the cylindrical male screw portion 14 of the fixed steel pipe 11 by rotating the rotary steel pipe 11 using the screw tightening device 20.

(5) In the above embodiment, although the torque receiving unit 27 is pushed and moved by the torque applying unit 26, the torque receiving unit 27 may be pulled by the torque applying unit 26. In this case, a winding material such as a wire, a rope, a chain, a fastening band, etc. is wound around the torque applying unit 26 and the torque receiving unit 27 so that the torque applying unit 26 and the torque receiving unit 27 are not separated in the circumferential direction by the winding. At the same time, the winding material (and the torque receiving portion 27 as necessary) is made to slide downward along the torque applying portion 26. If the winding material is strongly wound around the torque applying portion 26 and the torque receiving portion 27, the torque applying portion 26 and the torque receiving portion 27 abut each other when the tubular female screw portion 13 and the tubular male screw portion 14 are tightened. When loosely wound around the torque applying portion 26 and the torque receiving portion 27, a gap (interval) is formed between the torque applying portion 26 and the torque receiving portion 27 when the cylindrical female screw 13 and the cylindrical male screw 14 are tightened. Be done.
A rope-like body such as a wire, a rope or a chain may be connected to the torque applying portion 26 and the torque receiving portion 27, and the torque receiving portion 27 may be pulled by the torque applying portion 26 and the rope-like body.

(6) The through hole may be formed to pass through the torque receiving portion 27 up and down, and the torque applying portion 26 may be inserted into the through hole. In this case, by causing the traveling body 25 to travel along the guide 24, the torque applying unit 26 abuts on the edge of the through hole, torque is transmitted from the torque applying unit 26 to the torque receiving unit 27, and the torque receiving unit 27 It slides downward along the torque applying portion 26.

  DESCRIPTION OF SYMBOLS 10 ... Steel pipe connection body, 11 ... Steel pipe, 12 ... Steel pipe main body part, 13 ... Tubular internal thread part, 14 ... Tubular external thread part, 20 ... Screw fastening apparatus, 21 ... Holding tool, 24 ... Guide, 25 ... Traveling body, 26 ... torque application unit, 27 ... torque receiving unit

Claims (5)

In a screw tightening device for screwing an external thread portion and an internal thread portion respectively provided at ends of a pair of axially aligned tubes,
A guide provided annularly so as to surround one of the pair of tubes;
A traveling body capable of traveling along the guide;
A torque applying portion extending from the traveling body to the other pipe side along the axial direction;
And a torque receiving portion extending radially outward from an outer peripheral surface of the one pipe and receiving a torque accompanying the traveling of the traveling body from the torque applying portion.   The screw tightening device according to claim 1, wherein the torque receiving portion abuts on the torque applying portion so as to be slidable along the torque applying portion.   The screwing device according to claim 1, wherein the traveling body is a geared trolley. In a method of manufacturing a connected body of the tubes by screwing male and female threads respectively provided on ends of a pair of tubes arranged in an axial direction,
A torque applying portion extending from the traveling body to the other pipe side along the axial direction by causing the traveling body to travel along the guide provided annularly so as to surround one of the pair of pipes. From this, torque is applied to a torque receiving portion extending radially outward from the outer peripheral surface of the one tube, and the one tube is rotated to screw the male screw portion and the female screw portion. And a method of manufacturing a pipe assembly.   The other pipe is inserted into a hole drilled in the ground, and the upper part of the other pipe is protruded from the hole to restrain the circumferential movement of the other pipe, and the one pipe The pipe according to claim 4, wherein the traveling body is caused to travel while the lower end of the one pipe and the upper end of the other pipe are aligned while passing through the inside of the guide while suspending the Method of manufacturing linked body.

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