JP2020001048A - Steel pipe pile welding device - Google Patents

Abstract

To achieve mountability of a steel pipe pile welding device to a steel pipe pile comprising an annular guide rail, and simplification of structure and weight saving of the device.SOLUTION: A steel pipe pile welding device comprises an annular guide rail 10' mounted on an outer periphery of a steel pipe pile a1, and a movable body 20 which annularly moves along the guide rail 10'. In this device, the movable body 20 comprises: an engagement part 21' which is so engaged with the guide rail 10' as to move along the guide rail 10'; first and second roller parts 23, 24 which roll in a circumferential direction on an outer peripheral surface of the steel pipe pile a1 below the guide rail 10'; a magnet 31 which magnetically attracts the outer peripheral surface of the steel pipe pile a1 below the guide rail 10'; and an arc generation part 43 which generates arc toward the steel pipe pile a1.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a welding device for a steel pipe pile for welding a connection point of a steel pipe pile, and particularly to a welding device for a steel pipe pile suitable for adding another steel pipe pile to an upper side of a steel pipe pile to be buried.

Conventionally, as described in Patent Document 1, for example, this type of invention includes a welding device for a steel pipe pile including a guide rail attached to a peripheral surface of the steel pipe pile and a self-propelled device.
The guide rail has a concave portion formed in a circular shape on a peripheral surface thereof. And the self-propelled device has a guide roll that moves while rotating along the bottom surface of the concave portion, a wheel that rolls on the circumferential surface of the steel pipe pile, and a radially opposite side of the circumferential surface of the steel pipe pile on the opposite side. And a support arm for rolling the auxiliary wheel.
According to this welding device, since the steel pipe pile is sandwiched between the wheel and the auxiliary wheel, the self-propelled device is separated from the surface of the steel pipe pile, or the guide roll is separated from the guide roll. It can be prevented from falling off.

JP 2012-35309 A

However, according to the related art, when the welding device for the steel pipe pile is mounted on the steel pipe pile, the support arm is straddled from the near side to the back side of the steel pipe pile, and the distance between the wheel and the auxiliary wheel is increased. Steel pipe piles must be inserted between them, and there is room for improvement in workability.
Further, the entire device having the support arm and the like is required to have a simpler and lighter structure that is easily complicated and heavy.

In view of such a problem, the present invention has the following configuration.
In a welding device for a steel pipe pile including an annular guide rail mounted on the outer periphery of a steel pipe pile and a moving body that moves annularly along the guide rail, the moving body moves along the guide rail. A hook portion hung on the guide rail, a roller portion rolling in the circumferential direction on the outer peripheral surface of the steel pipe pile below the guide rail, and an outer periphery of the steel pipe pile below the guide rail. A welding device for a steel pipe pile, comprising: a magnet for magnetically attracting a surface; and an arc generating part for generating an arc toward the steel pipe pile.

  Since the present invention is configured as described above, the workability at the time of mounting on the steel pipe pile is good, and the structure can be made simple and lightweight.

It is a front view showing an example of the welding device of the steel pipe pile concerning the present invention. It is a side view which shows the same welding apparatus. It is sectional drawing which follows the (III)-(III) line of FIG. It is a side view which shows the other example of the welding device of the steel pipe pile which concerns on this invention.

Next, specific embodiments according to the present invention will be described in detail with reference to the drawings.
In the example shown in FIGS. 1 and 2, the lower end of a steel pipe pile a1 to be buried later is brought close to the upper end of a steel pipe pile a2 previously buried in the ground, and this adjacent portion is moved by a welding device 1 for a steel pipe pile. The welding operation is shown.

  Each of the steel pipe piles a1 and a2 to be installed with the welding device 1 is formed in a cylindrical shape from a ferromagnetic material such as iron or an alloy containing iron.

  The welding apparatus 1 includes an annular guide rail 10 mounted on the outer periphery of the steel pipe pile a1, and a moving body 20 that moves annularly along the guide rail 10.

The guide rail 10 is an annular member detachably provided on the outer peripheral surface of the steel pipe pile a1, and is formed of, for example, a hard material such as a metal.
The upper surface of the guide rail 10 extends in the circumferential direction substantially perpendicular to the outer peripheral surface of the steel pipe pile a1, and is formed in a substantially horizontal flat annular shape. This surface functions as a guide surface 11 that engages with the engaging portion 21 of the welding device 1 and guides the circumferential direction.
Above the guide surface 11, a detachable space S that allows the engaging portion 21 to move upward is secured.

The attachment / detachment space S is a space secured in a cylindrical shape along the guide surface 11 above the engaging portion 21 placed on the guide surface 11.
As shown in FIG. 2, the attachment / detachment space S is designed to prevent interference between members when the moving body 20 is mounted on the guide rail 10 or when the moving body 20 is detached from the guide rail 10. To make the work easier.

  The illustrated guide rail 10 is configured by combining two semi-annular members in an endless ring shape around a steel pipe pile a1. The two semi-annular members are connected to each other at one end by a hinge 12 so as to rotate with each other, and a flange provided at the other end is detachably connected by a fastener 13 such as a screw or a bolt.

  The moving body 20 includes a hook portion 21 that is hung on the guide rail 10 and extends downward, a base portion 22 that is connected to a lower end of the hook portion 21 and that is located below the guide rail 10, First and second roller portions 23 and 24 rotatably supported by the base 22 and rolling on the outer peripheral surface of the steel pipe pile a1 in the circumferential direction, and the steel pipe pile provided in the base 22 below the guide rail 10. A magnet 31 for magnetically attracting the outer peripheral surface of a1 and an arc generating portion 43 projecting downward from the inside of the base 22 and generating an arc toward a portion between the upper and lower steel pipe piles a1 and a2 are provided (see FIG. 1).

  The engaging portion 21 includes a plurality of rolling members 21a that roll on the guide surface 11 of the guide rail 10, and a support member 21b that supports the rolling members 21a rotatably and extends downward. . The engaging portion 21 moves annularly along the guide rail 10 by hanging the rolling member 21 a on the guide surface 11.

  The rolling member 21a is formed in a spherical shape from a hard material such as metal, and is supported on the upper end side of the supporting member 21b so as to freely roll along the guide surface 11.

The support member 21b has a protruding portion 21b1 on the upper end side facing the outer surface of the steel pipe pile a1 (see FIG. 2), and the plurality of rolling members 21a are respectively rotated by the protruding portion 21b1. It is freely supported.
Further, the lower side of the support member 21 b extends downward and is connected to the base 22. According to the illustrated example, the support member 21b has a substantially T-shape.

The base 22 has a hollow box shape inside (see FIG. 3).
The first roller portion 23 and the second roller portion 24 are supported by the base portion 22 so as to roll on the outer peripheral surface of the steel pipe pile a1 in the circumferential direction.

The first roller portion 23 is fixed to both ends of a support shaft 25 that penetrates the base 22.
The second roller portion 24 is disposed substantially parallel to the first roller portion 23 at intervals in the circumferential direction of the steel pipe pile a1. Like the first roller portion 23, the second roller portion 24 is also fixed to both ends of a support shaft 25 that passes through the base portion 22.

  Each support shaft 25 is positioned so as to be substantially parallel to the central axis of the steel pipe pile a1, and is rotatably supported by the base 22.

  The first and second rollers 23 and 24 are driven and rotated by a motor (not shown) supported in the base 22. This motor is controlled by a control circuit 27 in the base 22.

  The control circuit 27 is an electronic circuit including a microcomputer, a relay, and the like. An external power supply (not shown), an operation unit 27c, and the like are electrically connected to the control circuit 27 via a power supply wiring 27a, a control wiring 27b, and the like.

  The operation unit 27c is a switch box having a plurality of switches, transmits a signal by the switch operation to the control circuit 27, and remotely controls a motor (not shown), the electric position adjustment mechanism 41, and the like.

  According to the illustrated example, the operation unit 27c is connected to the control circuit 27 by wire. However, as another example of the operation unit 27c, a mode in which a control signal is wirelessly transmitted to the control circuit 27 is also possible. It is.

  The magnet 31 is provided in the base 22 at a position close to the outer peripheral surface of the steel pipe pile a1 so as to magnetically attract the outer peripheral surface of the steel pipe pile a1 at a position radially away from the outer peripheral surface of the steel pipe pile a1.

  The base 22 is provided with an arc generator 43 via an electric position adjustment mechanism 41.

  The electric position adjusting mechanism 41 is configured to vertically move an elevating bar 42 extending vertically by a rack-and-pinion mechanism and a motor or the like. The portion 43 is fixedly supported. The electric position adjustment mechanism 41 is electrically connected to the control circuit 27 and is operated by the operation unit 27c.

  The arc generator 43 is a welding torch fixed to the lower end of the lifting bar 42 via a bracket or the like, and is connected to a welding machine body (not shown) via a cable 44. The tip of the arc generating part 43 is directed to the joint between the upper and lower steel pipe piles a1 and a2.

  In the drawings, reference numerals 51 and 52 denote handles fixed to both the left and right sides of the base 22, and are used when the mobile unit 20 is carried.

Next, the characteristic effects of the welding device 1 for a steel pipe pile having the above configuration will be described in detail.
In order to weld the upper and lower steel pipe piles a1 and a2 using the steel pipe pile welding device 1, first, as shown in FIG. 1, the guide rail 10 is attached to the upper steel pipe pile a1, and then, The moving body 20 is engaged with the guide rail 10.
In this engagement, as shown in FIG. 2, the engagement portion 21 of the moving body 20 may be passed through the attachment / detachment space S above the guide surface 11 and placed on the guide surface 11, and may be fitted with complicated concave and convex fittings. Do not need.
In this hooking state, the base 22 side is hung on the lower end side of the hooking portion 21, the first and second roller portions 23 and 24 on the left and right come into contact with the outer peripheral surface of the steel pipe pile a1, and the arc generating portion 43 turns the upper and lower steel pipes. It faces the joint of the piles a1 and a2. The vertical position of the arc generating unit 43 can be easily adjusted by operating the electric position adjusting mechanism 41 by operating the operation unit 27c.

When the moving body 20 is set as described above, the magnet 31 in the base 22 magnetically attracts the steel pipe pile a1.
For this reason, the two parallel roller portions 23 and 24 are pressed against the outer peripheral surface of the steel pipe pile a1, and the central axis of the steel pipe pile a1 and the central axis of each of the roller portions 23 and 24 are held substantially parallel.

When the motor (not shown) in the base 22 is driven and rotated by the operation of the operation unit 27c, the first and second roller units 23 and 24 roll on the surface of the steel pipe pile a1, and the moving body 20 moves around the steel pipe pile a1 in the circumferential direction at a substantially constant speed.
During this movement, the two parallel roller portions 23 and 24 and the central axis of the steel pipe pile a1 are held substantially in parallel, so that the moving body 20 hardly tilts along the outer circumference of the steel pipe pile a1. Moving. Further, since the magnet 31 magnetically attracts the surface of the steel pipe pile a1, it is possible to prevent the engaging portion 21 from dropping off the guide rail 10.
Then, if an arc is generated from the arc generating portion 43 during the movement, it is possible to weld the joint portions of the steel pipe piles a1 and a2 substantially uniformly in the circumferential direction.

Therefore, according to the steel pipe pile welding device 1 of the present embodiment, workability when mounting the steel pipe pile welding device 1 to the steel pipe pile a1 is good, and high-quality welding can be performed.
In addition, since a conventional support arm or the like is not required, the entire apparatus can have a simple and lightweight structure.

Next, another embodiment shown in FIG. 4 will be described.
In the embodiment described below, since a part of the welding device 1 for a steel pipe pile is partially modified, the modified portion will be mainly described in detail, and the detailed description of other portions will be appropriately omitted. .

  The welding device 2 for a steel pipe pile shown in FIG. 4 is different from the welding device 1 for a steel pipe pile described above in that the guide rail 10 is replaced by a guide rail 10 ′ and the engaging portion 21 is replaced by an engaging portion 21 ′.

The guide rail 10 'is composed of a flat annular guide portion 10a having a guide surface 11 on the upper surface, and a tubular portion 10b connected to the upper side of the guide portion 10a. This guide rail 10 ′ is configured by combining two semi-annular members in an endless ring shape around the steel pipe pile a 1, similarly to the above-mentioned guide rail 10.
Also in the guide rail 10 ', a detachable space S for facilitating the engagement and disengagement of the engaging portion 21' is secured above the guide surface 11.

The engaging portion 21 ′ is obtained by replacing the spherical rolling member 21 a with the rolling member 21 a ′, and is provided in plural (for example, three) along the circumferential direction of the guide rail 10.
Each rolling member 21 a ′ is a disk-shaped or cylindrical roller, and is rotatably supported so as to roll on the guide surface 11.

  According to the steel pipe pile welding device 2 having the above-described configuration, the hook portion 21 can be easily hooked on the guide rail 10 ′, and the workability is good, in substantially the same manner as the steel pipe pile welding device 1 described above. It is.

  Further, the present invention is not limited to the above-described embodiment, and can be appropriately changed without changing the gist of the present invention.

1: Welding device for steel pipe pile 10, 10 ': Guide rail 20: Moving body 21, 21': Engagement part 21a, 21a ': Rolling member 21b: Support member 22: Base 23: First roller part 24: First Second roller part 25: Support shaft 31: Magnet 41: Electric position adjustment mechanism 42: Elevating bar 43: Arc generator a1, a2: Steel pipe pile S: Detachable space

Claims (5)

An annular guide rail attached to the outer periphery of a steel pipe pile, and a welding device for a steel pipe pile including a moving body that annularly moves along the guide rail,
The moving body is a hooked portion that is hung on the guide rail so as to move along the guide rail, and a roller portion that rolls in a circumferential direction on the outer peripheral surface of the steel pipe pile below the guide rail. And a magnet for magnetically attracting an outer peripheral surface of the steel pipe pile below the guide rail, and an arc generating unit for generating an arc toward the steel pipe pile.   The roller unit includes a first roller unit and a second roller unit that is substantially parallel to the first roller unit at intervals in the circumferential direction of the steel pipe pile. The welding device for a steel pipe pile according to claim 1.   The welding device for a steel pipe pile according to claim 1, wherein the magnet is provided so as to magnetically attract the outer peripheral surface of the steel pipe pile at a position distant from the outer peripheral surface of the steel pipe pile.   The guide rail has a substantially horizontal flat annular guide surface on which the engaging portion is placed, and secures an attaching / detaching space on the upper side of the guide surface to allow the upward movement of the engaging portion. The welding device for a steel pipe pile according to any one of claims 1 to 3, wherein: The welding device for a steel pipe pile according to any one of claims 1 to 4, further comprising an electric position adjusting mechanism that adjusts a vertical position of the arc generating unit.

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