JP4750414B2 - Fixing jig for tack welding - Google Patents

Description

  The present invention relates to a fixing jig for temporary welding for fixing the ends of two steel pipes facing each other with a predetermined route interval to be welded when they are tack welded to each other. .

  One of the typical measures to prevent settlement when constructing a building on soft ground is the rotary press pile method. This rotary press-in pile method is a method of rotating the steel pipe pile head while supporting it with heavy machinery, etc., and burying it in the ground. On the side of the tip of the steel pipe, the tip support force is improved and the penetration propulsion force is secured. A spiral blade is installed for the purpose. In addition, a drill bit and a drill plate are provided at the tip of the steel pipe pile so that it can be smoothly rotated and press-fitted even if there is a certain amount of cracks and burrs in the ground.

  The processing of the above-described spiral blades and excavation bits of the steel pipe tip is performed in a factory, and the steel pipe pile processed as a product is transported from the factory to a construction site. When the processed steel pipe pile is loaded on a truck bed or the like, the spiral blade becomes an obstacle, and there are problems that transportation to the site is inconvenient and transportation efficiency is poor.

  In order to solve this problem, there is a structure in which a short steel pipe processed with a spiral blade, a drill bit, or the like is configured as a pile tip member separately from the steel pipe main body and transported separately to the site (for example, Patent Document 1). reference). The pile tip member divided into the steel pipe body is generally connected to the steel pipe body by field welding. In this field welding operation, it is most important for quality control of steel pipe piles to align the axis of the steel pipe body and the pile tip member and attach them in a straight line.

On the other hand, there is a fixing jig for tack welding used when tacking the edges of two stainless steel pipes (see, for example, Patent Document 2). This fixing jig for tack welding is composed of a pair of two semicircular fastening members having fastening portions on both sides and having a tack welding hole. In order to tack weld the edges of two stainless steel pipes using the tack welding fixture, the tack welding spot of the stainless steel pipe is moved to the tack weld hole by the tack welding fixture. Temporarily fixed so as to be exposed, and tack welded by a tack torch at a tack weld spot through the tack weld hole.
JP 2004-169502 A JP 7-24595 A

  By the way, when performing on-site welding work between the steel pipe body and the pile tip member, one welding operator can operate the welding rod with the other hand while supporting the weight of the pile tip member with one hand. There was a problem that it was difficult to connect the pile tip members with the same axis. In addition, when it is difficult for one person to perform the field welding work, there is a problem that one person supports the pile tip member and one person performs welding, which results in an inefficient situation.

  Moreover, when the end edges of two stainless steel pipes are tack welded using the fixing jig for tack welding, it is necessary to maintain the linearity between the two stainless steel pipes. There is a problem in that it is difficult to fix the two fastening members of the tack welding fixing jig while maintaining the linearity between them.

  This invention is made | formed in view of said subject, and it aims at providing the fixing jig for temporary welding which can make the field welding operation | work of two steel pipes easy.

In order to achieve the above object, a tack welding welding fixture according to claim 1 is provided by tack welding two steel pipe edges of a pile tip member obtained by processing a spiral blade on a steel pipe body and a short steel pipe. A fixing jig for temporary welding, in which end edges of the two steel pipes are opposed to each other with a predetermined route interval to be welded, and a backing ring is inserted and fixed inside thereof ; It is formed in a substantially semi-cylindrical shape with an inner diameter that inscribes the steel pipe, and has an opening for tack welding the opposing edges of the two steel pipes on the side that fixes the pile tip member, fixing portion having a slightly smaller height projections than the thickness of the steel pipe pile body so as to be able to insert the said backing ring the holding and on its inner side a predetermined route distance to be welded of the two steel pipes on the side of the opening And substantially the same as the fixed part It is formed in a substantially semi-cylindrical shape with a diameter, has substantially the same length as the length of the upper part of the opening of the fixed part, and is connected to one side edge of the fixed part on one side so as to be openable and closable. An upper fixing portion that fixes the lower end portion of the steel pipe main body with the fixing portion by engaging with the other side edge of the fixing portion on the side, and a substantially semi-cylindrical shape having substantially the same inner diameter as the fixing portion The height of the opening is shorter than the upper fixing part and is substantially the same length as the part below the opening of the fixing part, and the height of the opening relative to the upper fixing part. It is connected to one side edge of the fixed part on one side so as to be openable and closable at substantially the same interval, and is engaged with the other side edge of the fixed part on the other side, so that also and a lower fixing unit for fixing between the fixing member upward, and, The serial and the center line of the circumferential direction of the intermediate line and the opening through the center between the upper fixing portion and a lower fixing part are in the same plane, and characterized.

According to the fixing jig for tack welding according to claim 1 of the present invention, the portion for fixing the steel pipe in a pair with the fixing portion is composed of the two portions of the upper fixing portion and the lower fixing portion. the work and other steel pipes for fixing the fixture to one of the steel pipe and operation of fixing by tack welding fixture, their respective maintaining the linearity between the steel tube, the edges of the two steel pipes It can be easily connected by field welding alone at the opening. Moreover, since the protrusion which hold | maintains a route space | interval is provided, a predetermined route space | interval can be ensured reliably between the opposing edges of the two steel pipes to connect. Furthermore, since the same distance as the opening is provided between the upper fixing part and the lower fixing part, it can be temporarily fixed from the opened interval .

Hereinafter, a fixing jig for tack welding according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of a tack welding fixing jig 1 according to the present embodiment. The tack welding fixing jig 1 includes a fixing portion 2 and an upper fixing as shown in FIG. The part 3 and the lower fixing part 4 are mainly configured. In addition, in this Embodiment, as shown in FIG. 2, although the case where the steel pipe main body 5 and the pile front-end | tip member 6 are fixed using the fixing jig 1 for temporary welding is demonstrated, this invention is steel pipes, In the general joint portion, the ends of the two steel pipes can be effectively utilized even when they are tack welded.

  The fixed portion 2 is a substantially semi-cylindrical steel member obtained by dividing a cylindrical steel pipe having an inner diameter that inscribes the steel pipe main body 5 and the pile tip member 6 into one half, and one side of the steel pipe main body 5 and the pile tip member 6 It abuts against. The length of the fixing portion 2 in the vertical direction is not particularly limited, but is sufficient to fix the steel pipe main body 5 and the pile tip member 6 and can be easily fixed. For this purpose, it is preferable that the length is as short as possible so as to be lightweight and easy to handle. The fixing portion 2 has an opening 7 for tack welding the steel pipe body 5 and the pile tip member 6 fixed by the tack welding fixing jig 1.

  The opening 7 can fix the lower end of the steel pipe body 5 at a portion above the opening 7 of the fixing portion 2, and can fix the upper portion of the pile tip member 6 above the spiral blade 8 at a portion below the opening 7. Formed in position. The height dimension of the opening 7 is high enough to perform the welding operation of the steel pipe main body 5 and the pile tip member 6 through the opening 7, and the length dimension extending in the circumferential direction is welded. A length that is long enough to carry out the work and that leaves enough room so that the strength of the fixing portion 2 is not impaired is preferable.

  Moreover, the fixing | fixed part 2 has the protrusion 9 for ensuring the predetermined | prescribed root space | interval for preventing the penetration defect in a welding part. The protrusions 9 are provided on the inner side of the fixed portion 2 and on the side of the opening 7 in the circumferential direction, and may be provided on both sides or only on one side. The width of the protrusion 9 is set to a width suitable for securing a predetermined route interval between the steel pipe body 5 and the pile tip member 6, and the height is preferably slightly smaller than the thickness of the steel pipe body 5. The length extending in the circumferential direction is not particularly limited. In addition, it is preferable that the vertical position of the protrusion 9 is the same position as the vertical center of the opening 7 because welding work can be easily performed. The fixing portion 2 has hinges 10a and 10b on one side, and is connected to the upper fixing portion 3 through the hinge 10a so as to be openable and closable, and is opened and closed with the lower fixing portion 4 through the hinge 10b. It is connected freely. The fixing portion 2 has locking claws 11a and 11b on the other side of the hinges 10a and 10b. The locking claws 11a and 11b correspond to the upper fixing portion 3 and the lower fixing portion 4, respectively. One place is provided.

  The upper fixing portion 3 is an approximately semi-cylindrical steel member having an inner diameter that inscribes the steel pipe main body 5 as in the case of the fixing portion 2. The fixing portion 2 is a steel pipe main body. The side in contact with 5 is the side in contact with the other side. The length of the upper fixing portion 3 in the vertical direction is substantially the same as that of the portion above the opening 7 of the fixing portion 2. The upper fixing portion 3 is connected to one side edge of the fixing portion 2 through a hinge 10a on one side so as to be freely opened and closed. Further, a buckle 12a is provided on the other side where the hinge 10a is provided, and the fixing jig 1 for temporary welding is fixed to the fixing portion 2 by the latching claw 11a of the buckle 12a and the fixing portion 2. The other side edge and the upper fixing portion 3 are fixed to the steel pipe body 5.

  The lower fixing portion 4 is an approximately semi-cylindrical steel member that has an inner diameter that inscribes a pile tip member 6 having the same diameter as the steel pipe main body 5 and that divides a cylindrical steel pipe into approximately half. The side that is in contact with the pile tip member 6 is in contact with the other side. The length of the lower fixing portion 4 in the vertical direction is substantially the same as the length below the opening 7 of the fixing portion 2. The lower fixing portion 4 is connected to one side edge of the fixing portion 2 via a hinge 10b on one side so as to be freely opened and closed. Further, the hinge 10b has a buckle 12b on the other side, and the tack welding fixing jig 1 is connected to the other side edge of the fixing portion 2 by the buckle 12b and the locking claw 11b of the fixing portion 2. The pile tip member 6 is fixed by engaging the lower fixing portion 4. The upper fixing portion 3 and the lower fixing portion 4 are connected to the fixing portion 2 at substantially the same distance as the height dimension of the opening 7, and between the upper fixing portion 3 and the lower fixing portion 4. Since the intermediate line passing through the center and the center line in the circumferential direction of the opening 7 are in the same plane, the steel pipe body 5 and the pile tip member 6 are also located in the portion between the upper fixing portion 3 and the lower fixing portion 4. Can be tack welded.

Next, as shown in FIG. 2, the steel pipe main body 5 and the pile tip member 6 are horizontally placed, and the steel pipe main body 5 and The case of tack welding the pile tip member 6 will be described.
In order to tack weld the steel pipe body 5 and the pile tip member 6 using the tack welding fixing jig 1, first, as shown in FIG. 1 fixed part 2 is applied. At this time, the protrusion 9 is brought into contact with the lower end of the steel pipe body 5 so as to ensure a predetermined route interval. Then, as shown in FIG. 4, the upper fixing portion 3 is closed, and the fixing portion 2 and the upper fixing portion 3 are engaged by the locking portion 11a and the buckle 12a, and the temporary welding fixing jig 1 is attached to the steel pipe body 5. Fix it.

  Next, as shown in FIG. 4, a backing ring 13 for welding is inserted inside the steel pipe main body 5. However, since the height of the protrusion 9 is slightly smaller than the thickness of the steel pipe main body 5, A contact ring 13 can be inserted. Then, as shown in FIG. 5, the pile tip member 6 is inserted in accordance with the inserted backing ring 13. After the pile tip member 6 is inserted, one side of the pile tip member 6 is in contact with the inside of the fixed portion 2. Further, by bringing the upper end of the pile tip member 6 into contact with the protrusion 9, the route distance between the opposite edges of the steel pipe main body 5 and the pile tip member 6 required during welding is secured by the protrusion 9.

  Next, as shown in FIG. 6, the lower fixing portion 4 is closed, the fixing portion 2 and the lower fixing portion 4 are engaged by the locking portion 11 b and the buckle 12 b, and the pile tip member 6 is fixed, whereby the steel pipe body 5 And the shaft center of the pile tip member 6 are aligned so that the linearity of the entire pile is maintained. And the welding pipe (not shown) is operated, and the steel pipe main body 5 and the pile tip member 6 are tack-welded about two places in the part between the upper fixing | fixed part 3 and the lower fixing | fixed part 4. FIG. Furthermore, the steel pipe main body 5 and the pile tip member 6 are rotated with the fixing jig 1 for tack welding fixed and turned upside down, and the steel pipe main body 5 and the pile tip end are also provided in the opening 7 provided in the fixing portion 2. The member 6 is tack welded at about two places. After the tack welding is completed, the tack welding fixing jig 1 is removed, and the steel pipe main body 5 and the pile tip member 6 are fully welded.

  As is clear from the above description, according to the tack welding fixing fixture 1 of the present embodiment, the portions that hold the steel pipe body 5 and the pile tip member 6 on one side are the upper fixing portion 3 and the lower fixing portion 4. Since it is divided into two, the work for fixing the tack welding fixing jig 1 to the steel pipe body 5 and the work for fixing the pile tip member 6 by the tack welding welding jig 1 can be easily performed. The steel pipe main body 5 and the pile tip member 6 can be easily tack-welded by one person alone while maintaining the linearity by aligning the axial centers of the steel pipe main body 5 and the pile tip member 6 by field welding. Moreover, since it has the protrusion 9, a root space | interval can be ensured reliably between the edges which the steel pipe main body 5 and the pile tip member 6 mutually face.

  In this embodiment, the fixing portion 2 and the upper fixing portion 3 are engaged by the locking claw 11a and the buckle 12a, and the fixing portion 2 and the lower fixing portion 4 are engaged by the locking claw 11b and the buckle 12b. However, the present invention is not limited to this as long as the fixing portion 2 and the upper fixing portion 3 and the fixing portion 2 and the lower fixing portion 4 are respectively engaged. Further, the position of the opening 7 is closer to the pile tip member 6 side, and the upper fixing part 3 is longer than the lower fixing part 4, but the fixing jig for temporary welding in the case where the steel pipes are temporarily welded to each other. 1, there is an opening 7 in the center of the fixing portion 2, and the upper fixing portion 3 and the lower fixing portion 4 may have the same length.

  INDUSTRIAL APPLICABILITY The present invention can be used in the case where the ends of two steel pipes are tack-welded to each other and the ends of the two steel pipes are fixed to face each other with a predetermined route interval to be welded.

It is a perspective view which shows schematic structure of the fixing jig for tack welding which concerns on embodiment of this invention. It is a top view which shows the procedure of tack-welding a steel pipe and a pile front-end | tip member using the fixing jig for tack welding. It is a top view which shows the procedure of tack-welding a steel pipe and a pile front-end | tip member using the fixing jig for tack welding. It is a top view which shows the procedure of tack-welding a steel pipe and a pile front-end | tip member using the fixing jig for tack welding. It is a top view which shows the procedure of tack-welding a steel pipe and a pile front-end | tip member using the fixing jig for tack welding. It is a top view which shows the procedure of tack-welding a steel pipe and a pile front-end | tip member using the fixing jig for tack welding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing jig for tack welding 2 Fixing part 3 Upper fixing part 4 Lower fixing part 7 Opening part 9 Protrusion 10a, 10b Hinge 11a, 11b Locking claw 12a, 12b Buckle

Claims (1)

When tacking and welding the ends of two steel pipes of a pile tip member in which a spiral blade has been processed on a steel pipe body and a short steel pipe, a predetermined route interval for welding the edges of the two steel pipes is provided. It is a fixing jig for temporary welding that faces each other and inserts a backing ring inside to fix it,
The steel pipe is formed in a substantially semi-cylindrical shape with an inner diameter that inscribes the steel pipe, and has an opening for tack welding the opposing edges of the two steel pipes to the side that fixes the pile tip member , fixed with the two holding a predetermined route distance to be welded of a steel pipe and slightly smaller height than the thickness of the steel pipe pile body so as to be able to insert the said backing ring on the inner protrusions at the side of the opening in And
It is formed in a substantially semi-cylindrical shape having substantially the same inner diameter as the fixed part, has substantially the same length as the length of the upper part of the opening of the fixed part, and can be opened and closed with one side edge of the fixed part on one side. And an upper fixing portion that fixes the lower end portion of the steel pipe main body with the fixing portion by engaging with the other side edge of the fixing portion on the other side,
It is formed in a substantially semi-cylindrical shape having substantially the same inner diameter as the fixed portion, is shorter than the upper fixed portion, is substantially the same length as the portion below the opening portion of the fixed portion, and the upper portion It is connected to one side edge of the fixing part on one side so as to be openable and closable with respect to the fixing part at substantially the same height as the height of the opening, and is engaged with the other side edge of the fixing part on the other side. A lower fixing portion that fixes the upper portion of the pile tip member with the fixing member above the spiral blade of the pile tip member ,
A fixing jig for temporary welding, wherein an intermediate line passing through the center between the upper fixing portion and the lower fixing portion and a center line in the circumferential direction of the opening are in the same plane.

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