JP6336378B2 - Steel pipe connection method - Google Patents

Description

The present invention relates to a method for connecting steel pipes.

  Patent document 1 is disclosing the longitudinal joining method of the steel pipe pile which uses welding. In this method of longitudinally connecting steel pipe piles, alignment protrusions are fixed to the outer periphery of each connection portion of the upper pile and the lower pile, facing each other in a plurality of locations in the circumferential direction. Further, a guide jig for alignment provided with an introduction engaging groove into which the protrusion of the upper pile can be inserted is formed, and this guide jig is fitted and erected on the protrusion of the lower pile. After that, the upper pile that has been lifted is lowered onto the built-in lower pile, and the protrusion of the upper pile is inserted into the introduction engagement groove, thereby joining the upper pile onto the lower pile.

  Patent Document 2 discloses a fixing jig for tack welding that fixes the edges of two steel pipes facing each other with a root interval when tacking the edges of two steel pipes together. . The fixing jig for tack welding includes a substantially semi-cylindrical fixing portion that can accommodate the ends of these steel pipes, and a protrusion for holding the above-described route interval is formed inside the fixing portion. Yes.

Japanese Patent No. 3031659 Japanese Patent No. 4750414

  However, in the steel pipe pile longitudinal joining method disclosed in Patent Document 1, the protrusion of the upper pile is seated in the receiving portion of the introduction engagement groove, and at the same time, the lower end surface of the upper pile is joined to the upper end surface of the lower pile. (See paragraph number 0018 of Patent Document 1). Therefore, in Patent Document 1, in the state where the protrusion of the upper pile is seated in the receiving portion of the introduction engagement groove, a route interval is secured between the lower end surface of the upper pile and the upper end surface of the lower pile. There wasn't.

In this regard, by using the tack welding fixing jig disclosed in Patent Document 2, it is possible to secure a route distance between the steel pipes to be welded.
However, in the fixing jig for tack welding disclosed in Patent Document 2, a root interval is secured by interposing a protrusion between the steel pipes to be welded. Therefore, in Patent Document 2, it is difficult to further adjust the route interval determined by the size of the protrusion.

In view of such a situation, the present invention provides a steel pipe connecting jig capable of easily adjusting a distance between connected steel pipes (for example, a route distance) , and a steel pipe connecting method using the same. With the goal.

Therefore, the steel pipe connection method according to the present invention includes a first steel pipe extending in the vertical direction and a first steel pipe arranged above the first steel pipe so that the lower end faces the upper end of the first steel pipe and extending in the vertical direction. It is the method of connecting the existing 2nd steel pipe with each other. Here, the first steel pipe and the second steel pipe constitute a steel pipe pile. The steel pipe connecting jig that is used in connection with the first ring-shaped member that surrounds the outer periphery of the first steel tube is fixed to the outer peripheral surface of the upper portion of the first steel tube, the lower portion of the second steel pipe A second ring-shaped member fixed to the outer peripheral surface and surrounding the outer periphery of the second steel pipe; and a distance changing means capable of changing a distance between the first ring-shaped member and the second ring-shaped member. Consists of including. The distance changing means changes the distances at a plurality of positions in the circumferential direction of the first ring-shaped member and the second ring-shaped member, thereby a plurality of distances in the circumferential direction of the first steel pipe and the second steel pipe . The route spacing between the first steel pipe and the second steel pipe in position can be adjusted. The steel pipe connection method according to the present invention includes a first step of driving the first steel pipe into the ground, and a first ring-shaped member on the outer peripheral surface of the upper portion of the first steel pipe exposed on the ground after the first step. A second step of fixing the second steel pipe, a third step of bringing the lower end of the second steel pipe into contact with the upper end of the first steel pipe after the second step, and a second ring-shaped member of the second steel pipe after the third step A fourth step of fixing to the outer peripheral surface of the lower part of the steel plate, a fifth step of adjusting the route interval by increasing the distance by a distance changing means after the fourth step, and a lower end of the second steel pipe after the fifth step A sixth step of welding and fixing to the upper end of the first steel pipe.

According to the present invention, the distance between the first and second ring-shaped members at a plurality of positions in the circumferential direction of the first and second ring-shaped members can be changed by the distance changing means. Therefore, in a state where the first ring-shaped member is fixed to the outer peripheral surface of the upper portion of the first steel pipe and the second ring-shaped member is fixed to the outer peripheral surface of the lower portion of the second steel pipe, the first By changing the distance between the second ring-shaped members by the distance changing means, the first and second steel pipes at a plurality of positions in the circumferential direction of the first and second steel pipes with the change of the distance. The interval between the second steel pipes can be easily adjusted.

The top view of the jig for steel pipe connection in one embodiment of the present invention II sectional view of FIG. II-II sectional view of FIG. Top view of arcuate member in one embodiment Side view of rod-shaped member, first and second mounting members in the embodiment. The figure which shows the connection method of the upper pile and the lower pile in the said one Embodiment. The figure which shows the connection method of the upper pile and the lower pile in the said one Embodiment. The figure which shows the connection method of the upper pile and the lower pile in the said one Embodiment. Partial enlarged view of part P in FIG. The figure which shows the space | interval between the upper pile and the lower pile in the said embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.
FIG. 1 is a top view of a steel pipe connecting jig 1 according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II of FIG. 3 is a cross-sectional view taken along the line II-II in FIG. FIG. 4A is a top view of the arcuate member 20 constituting the upper ring-shaped member 2. FIG. 4B is a top view of the arc-shaped member 30 constituting the lower ring-shaped member 3.

  The steel pipe connecting jig 1 includes a pair of upper and lower ring-shaped members 2 and 3 and distance changing means 4 that can change the distance between the ring-shaped members 2 and 3. In the following description, the radial direction of the ring-shaped members 2 and 3 is simply referred to as “radial direction” unless otherwise specified.

The upper ring-shaped member 2 is a member constituting the upper part of the steel pipe connecting jig 1 and can be disposed immediately above the lower ring-shaped member 3.
The ring-shaped member 2 includes a plurality (two in FIG. 1) of arc-shaped members 20. In other words, the ring-shaped member 2 is divided into a plurality of arc-shaped members 20.
The arcuate member 20 is made of steel. As shown in FIG. 4A, the arc member 20 includes a semi-cylindrical main body portion 21, a semicircular lower flange portion 22 projecting radially outward from the lower end portion of the main body portion 21, and a pair of ends. And a plate 23. Here, the inner diameter of the semi-cylindrical main body 21 substantially matches the outer diameter of the upper pile 110 described later.

Of the lower flange portion 22, a plurality of regions 22a (for example, two locations in FIG. 4A) where the distance changing means 4 (especially, adjusting bolts 41 described later) are installed are respectively radially outward. Further, an extended portion 22b that protrudes is formed.
In the region 22a of the lower flange portion 22 (that is, the portion where the extension portion 22b is formed in the lower flange portion 22), a hole portion (groove portion) 24 having a U-shaped cross-sectional shape in a top view is formed so as to penetrate therethrough. . A radially outer portion (open end of the U-shaped cross section) of the hole 24 is open to the outside. Therefore, the adjustment bolt 41 can be horizontally moved from the outside and inserted into the hole 24. Further, the adjustment bolt 41 can be removed from the hole 24 by horizontally moving the adjustment bolt 41 from the inside of the hole 24 to the outside.

  Here, with respect to the plurality of extension portions 22b and hole portions 24 formed in the lower flange portion 22, a plurality (two in FIG. 1) of arc-shaped members 20 are assembled to form the ring-shaped member 2 as shown in FIG. Are integrated radially and at equal intervals in the circumferential direction. In this respect, in the present embodiment, the ring-shaped member 2 includes a total of four extension portions 22b and hole portions 24, so that the central angle between the adjacent hole portions 24 is 90 ° (when viewed from above) ( = 360 ° ÷ 4). In the present embodiment, the ring-shaped member 2 includes a total of four extensions 22b and holes 24, but the number of extensions 22b and holes 24 is not limited thereto.

A pair of plate-like members 25 are erected in each region 22 a of the lower flange portion 22. Between the pair of plate-like members 25, the above-described hole 24 is located, and the distance changing means 4 can be arranged.
The lower end portion of the plate-like member 25 is fixed to the upper surface of the region 22 a of the lower flange portion 22. Further, as shown in FIG. 1, the plate-like members 25 are arranged radially when a plurality of (two in FIG. 1) arc-shaped members 20 are assembled and integrated as the ring-like member 2. In addition, it extends radially outward from the main body 21.

An extension 25 a that further extends radially outward is formed at the lower end of the plate-like member 25. A hole 25b through which the detachment prevention pin 81 can be inserted is formed through the extension 25a.
The plate-like member 25 is formed with a through hole 26 for mounting a shackle (not shown). One end of a chain (not shown) is fixed to the shackle attached to the through hole 26. The other end of the chain is fixed to a locking pin 81. Therefore, the locking pin 81 is fixed to the plate-like member 25 via the chain and the shackle.

At the upper end of the plate-like member 25, a tapered extension 25c that extends further upward is formed. The plate-like member 25 including the extension 25c corresponds to the “guide member” of the present invention, and has a function of guiding the upper pile 110 described later into the ring-like member 2. Further, the plate-like member 25 including the extension portion 25c is provided on the ring-like member 2 and protrudes upward. Further, the extension portion 25 c is located above the main body portion 21.
The guide portion 25d with which the upper pile 110 can come into contact with the extension portion 25c is inclined so as to go radially inward as it goes downward. That is, the guide portion 25d forms an inclined surface that goes radially inward as it goes downward. Moreover, the top part of the extension part 25c is rounded.

A suspension fitting 27 is provided on the outer surface of the plate-like member 25 including the extension portion 25 c on the side opposite to the side that can be adjacent to the distance changing means 4. The hanging metal fitting 27 is plate-shaped, and a through hole 27a is formed through the center thereof.
In the present embodiment, the hanging bracket 27 is provided on one plate-like member 25 of the pair of plate-like members 25 erected on each of the regions 22 a of the lower flange portion 22. The number and the installation location of the hanging metal fittings 27 installed in are not limited to this. For example, the hanging metal fittings 27 may be provided on both the pair of plate-like members 25. Alternatively, the hanging metal fitting 27 may be provided on the upper surface of the lower flange portion 22.

End plates 23 are provided at both ends in the circumferential direction of the semi-cylindrical main body 21. The lower end portion of the end plate 23 is fixed to the circumferential end portion of the lower flange portion 22. A through hole 23 a for inserting a male screw portion of the bolt 85 is formed in the center portion of the end plate 23.
When a plurality (two in FIG. 1) of arc-shaped members 20 are assembled and integrated as the ring-shaped member 2, the end plate 23 of one arc-shaped member 20 is relative to the end plate 23 of the other arc-shaped member 20. To do. At this time, the through hole 23 a of the end plate 23 of one arcuate member 20 faces the through hole 23 a of the end plate 23 of the other arcuate member 20. The arcuate members 20 are fastened and fixed by a bolt 85 in which a male screw portion is inserted into the through hole 23 a of the end plate 23 and a nut 86 having a female screw portion that is screwed into the male screw portion of the bolt 85. The ring-shaped member 2 assembled in this way has a circular shape when viewed from above.

The lower ring-shaped member 3 is a member constituting the lower part of the steel pipe connecting jig 1 and can be disposed immediately below the upper ring-shaped member 2.
The ring-shaped member 3 includes a plurality (two in FIG. 3) of arc-shaped members 30. In other words, the ring-shaped member 3 is divided into a plurality of arc-shaped members 30.
The arcuate member 30 is made of steel. As shown in FIG. 4B, the arc-shaped member 30 includes a semi-cylindrical main body 31, a semicircular upper flange 32 projecting radially outward from the upper end of the main body 31, and a pair of ends. And a plate 33. Here, the inner diameter of the semi-cylindrical main body 31 substantially matches the outer diameter of the lower pile 100 described later.

Of the upper flange portion 32, a plurality of regions 32a (for example, two locations in FIG. 4B) where the distance changing means 4 (especially, adjusting bolts 41 described later) are installed are respectively radially outward. Further, an extended portion 32b that protrudes is formed.
A hole (groove portion) 34 having a U-shaped cross-sectional shape in a top view is formed through the region 32a of the upper flange portion 32 (that is, the portion of the upper flange portion 32 where the extension portion 32b is formed). . The radially outer portion (open end of the U-shaped cross section) of the hole 34 is open to the outside. Therefore, the adjustment bolt 41 can be horizontally moved from the outside and inserted into the hole 34. Further, the adjustment bolt 41 can be removed from the hole 24 by horizontally moving the adjustment bolt 41 from the inside of the hole 34 to the outside.

  Here, with respect to the plurality of extensions 32b and holes 34 formed in the upper flange portion 32, as shown in FIG. 3, a plurality (two in FIG. 3) of arc-shaped members 30 are assembled to form the ring-shaped member 3. Are integrated radially and at equal intervals in the circumferential direction. In this respect, in the present embodiment, the ring-shaped member 3 includes a total of four extending portions 32b and holes 34, and therefore, when viewed from above, the central angle between the adjacent holes 34 is 90 ° ( = 360 ° ÷ 4). In the present embodiment, the ring-shaped member 3 includes a total of four extending portions 32b and holes 34, but the number of the extending portions 32b and the holes 34 is not limited thereto.

A pair of plate-like members 35 is provided in each of the regions 32 a of the upper flange portion 32. Between the pair of plate-like members 35, the aforementioned hole 34 is located, and the distance changing means 4 can be arranged.
The upper end portion of the plate member 35 is fixed to the lower surface of the region 32 a of the upper flange portion 32. Further, the plate-like member 35 has a diameter from the main body 31 so that a plurality of (two in FIG. 3) arc-like members 30 are assembled and integrated as the ring-like member 3 so as to be radially arranged. It extends toward the outside in the direction.

An extension 35 a that further extends radially outward is formed at the upper end of the plate member 35. A hole 35b through which the detachment prevention pin 83 can be inserted is formed through the extension 35a.
The plate-like member 35 is formed with a through hole 36 for mounting a shackle (not shown). One end of a chain (not shown) is fixed to the shackle attached to the through hole 36. The other end of the chain is fixed to a locking pin 83. Therefore, the locking pin 83 is fixed to the plate-like member 35 via the chain and the shackle.

A plurality of (for example, two in FIG. 4B) suspension brackets 37 are erected on the upper surface of the upper flange portion 32. The hanging metal fitting 37 is plate-shaped, and a through hole 37a is formed through the central portion thereof.
In addition, the number and installation location of the hanging metal fittings 37 erected on the upper surface of the upper flange portion 32 are not limited thereto.
In addition, since the hanging bracket 37 can be disposed between the ring-shaped members 2 and 3, the hanging bracket 37 can function as a stopper that suppresses contact between the ring-shaped members 2 and 3. It can function as a pinching prevention metal fitting that prevents a work tool, a part of the worker's body, or the like from being pinched between the shaped members 2 and 3.

End plates 33 are provided at both ends in the circumferential direction of the semi-cylindrical main body 31. An upper end portion of the end plate 33 is fixed to a circumferential end portion of the upper flange portion 32. A through hole 33 a for inserting a male screw portion of the bolt 88 is formed in the center portion of the end plate 33.
When a plurality (two in FIG. 3) of arc-shaped members 30 are assembled and integrated as the ring-shaped member 3, the end plate 33 of one arc-shaped member 30 is relative to the end plate 33 of the other arc-shaped member 30. To do. At this time, the through hole 33 a of the end plate 33 of one arcuate member 30 faces the through hole 33 a of the end plate 33 of the other arcuate member 30. The arc-shaped members 30 are fastened and fixed by a bolt 88 in which a male screw portion is inserted into the through hole 33 a of the end plate 33 and a nut 89 having a female screw portion that is screwed into the male screw portion of the bolt 88. The ring-shaped member 3 assembled in this way has a circular shape when viewed from above.

Next, the distance changing means 4 will be described with reference to FIG. 5 in addition to the above-described FIGS.
FIG. 5A is a side view of the adjustment bolt 41. FIGS. 5B and 5C are side views of the adjustment bolt 41 provided with the first attachment member 42 and the second attachment member 43, respectively. Here, FIG. 5B shows a state in which the first attachment member 42 and the second attachment member 43 are separated from each other. On the other hand, FIG. 5C shows a state in which the first attachment member 42 and the second attachment member 43 are close to each other.

  The distance changing unit 4 includes a plurality of (for example, four) adjustment bolts 41 and a first attachment member 42 and a second attachment member 43 provided on each adjustment bolt 41. Here, the number of adjusting bolts 41 constituting the distance changing means 4 is equal to the number of each of the holes 24 and 34 described above.

  As shown in FIG. 5 (A), the adjustment bolt 41 includes a first male screw portion 45 constituting the lower portion thereof, a second male screw portion 46 constituting the upper portion thereof, and a central portion in the vertical direction. And a nut 47 to be provided. The nut 47 is, for example, a hex nut. The nut 47 includes a first female screw portion (not shown) that is screwed into an upper end portion of the first male screw portion 45 at a lower portion thereof. Further, the nut 47 includes a second female screw portion (not shown) that is screwed into a lower end portion of the second male screw portion 46 at an upper portion thereof. In the present embodiment, the first male screw portion 45 is a left-hand screw and the second male screw portion 46 is a right-hand screw, but instead, the first male screw portion 45 is a right-hand screw, The two male screw portions 46 may be left-handed screws.

Regarding the adjustment bolt 41, the nut 47 and the first male screw portion 45 are fixed by welding in a state where the upper end portion of the first male screw portion 45 is screwed to the lower portion of the nut 47. Further, the nut 47 and the second male screw portion 46 are fixed by welding in a state where the lower end portion of the second male screw portion 46 is screwed to the upper portion of the nut 47. Therefore, in the adjusting bolt 41, the first male screw portion 45, the second male screw portion 46, and the nut 47 are firmly integrated with each other.
Here, the adjustment bolt 41 corresponds to the “rod-shaped member” of the present invention. The plurality of adjustment bolts 41 are arranged at intervals from each other along the circumferential direction of the ring-shaped members 2 and 3, and each extend in the vertical direction.

The first attachment member 42 is provided on the lower portion of the adjustment bolt 41 (that is, the first male screw portion 45) and detachably attaches the lower portion of the adjustment bolt 41 to the ring-shaped member 3. is there.
The first attachment member 42 includes a pair of upper and lower rectangular plate washers 42a and 42b, a cylindrical member 42c, and a tubular member 42d. The cylindrical member 42c extends in the vertical direction so as to pass through the central opening of the upper washer 42a and the central opening of the lower washer 42b.

A female screw portion (not shown) is formed on the inner surface of the cylindrical member 42c so that the first male screw portion 45 can be rotatably screwed. A washer 42a is fixed to the upper portion of the cylindrical member 42c by welding. A washer 42b is fixed to the lower portion of the cylindrical member 42c by welding. The lower end of the tubular member 42d is fixed by welding to the upper end of the cylindrical member 42c.
The cylindrical member 42c and the tubular member 42d extend substantially coaxially, and the lower portion of the adjustment bolt 41 (that is, the first male screw portion 45) can be inserted into these members.
Here, the distance between the washers 42 a and 42 b is larger than the thickness of the upper flange portion 32 of the ring-shaped member 3. The cylindrical member 42c has an outer diameter so that it can be inserted into the hole 34 of the upper flange portion 32 of the arc-shaped member 30.

With the lower part of the adjustment bolt 41 (that is, the first male threaded portion 45) inserted into the tubular member 42d and screwed into the cylindrical member 42c, the space between the washers 42a and 42b of the cylindrical member 42c. The first attachment member 42 can be fitted into the hole 34 by inserting the portion into the hole 34 of the upper flange portion 32 of the arcuate member 30. Therefore, the lower portion of the adjustment bolt 41 is detachably attached to the ring-shaped member 3 by the first attachment member 42. Here, the locking pin 83 has a role of preventing the first mounting member 42 from coming off the hole 34 and falling off.
At this time, by rotating the adjustment bolt 41 around the central axis with respect to the first attachment member 42, the first attachment member 42 can move in the vertical direction with respect to the adjustment bolt 41. It is.

The second attachment member 43 is provided on the upper portion of the adjustment bolt 41 (that is, the second male screw portion 46) and detachably attaches the upper portion of the adjustment bolt 41 to the ring-shaped member 2.
The second attachment member 43 includes a pair of upper and lower rectangular plate washers 43a and 43b, a cylindrical member 43c, and a tubular member 43d. The cylindrical member 43c extends in the vertical direction so as to penetrate the central opening of the upper washer 43a and the central opening of the lower washer 43b.

An internal thread portion (not shown) is formed on the inner surface of the cylindrical member 43c so that the second external thread portion 46 can be rotatably engaged. A washer 43a is fixed to the upper portion of the cylindrical member 43c by welding. A washer 43b is fixed to the lower portion of the cylindrical member 43c by welding. The upper end portion of the tubular member 43d is fixed by welding to the lower end portion of the cylindrical member 43c.
The cylindrical member 43c and the tubular member 43d extend substantially coaxially, and the upper portion of the adjustment bolt 41 (that is, the second male screw portion 46) can be inserted into these members.
Here, the distance between the washers 43 a and 43 b is larger than the thickness of the lower flange portion 22 of the ring-shaped member 2. The cylindrical member 43c has an outer diameter that can be inserted into the hole 24 of the lower flange portion 22 of the arc-shaped member 20.

A portion between the washers 43a and 43b of the cylindrical member 43c in a state where the upper portion (that is, the second male screw portion 46) of the adjustment bolt 41 is inserted into the tubular member 43d and screwed into the cylindrical member 43c. Is inserted into the hole 24 of the lower flange portion 22 of the arcuate member 20, so that the second attachment member 43 can be fitted into the hole 24. Therefore, the upper portion of the adjustment bolt 41 is detachably attached to the ring-shaped member 2 by the second attachment member 43. Here, the locking pin 81 has a role of preventing the second mounting member 43 from being detached from the hole 24 and falling off.
At this time, by rotating the adjustment bolt 41 around the central axis with respect to the second attachment member 43, the second attachment member 43 can move in the vertical direction with respect to the adjustment bolt 41. It is.

  Therefore, the lower part of the adjustment bolt 41 is inserted into the tubular member 42d and screwed into the cylindrical member 42c, and the upper part of the adjustment bolt 41 is inserted into the tubular member 43d and screwed into the cylindrical member 43c. After fitting the first mounting member 42 and the second mounting member 43 into the holes 34 and 24 in the combined state, the adjustment bolts with respect to the first mounting member 42 and the second mounting member 43 are adjusted. By rotating 41 forward about the central axis, the first mounting member 42 and the second mounting member 43 are separated from each other (see FIG. 5B), and the first mounting member 42 and the second mounting member The first mounting member 42 and the second mounting member 43 approach each other by reversing the adjustment bolt 41 around the central axis with respect to 43 (see FIG. 5C). In this way, the distance between the ring-shaped member 3 to which the first mounting member 42 is attached and the ring-shaped member 2 to which the second mounting member 43 is attached can be changed by the distance changing means 4. . In the present embodiment, the plurality of adjustment bolts 41 are arranged at intervals from each other along the circumferential direction of the ring-shaped members 2 and 3, and each adjustment bolt 41 has a first attachment member. 42 and the second mounting member 43 are provided, so that the distance changing means 4 is used for each of the ring-shaped members 2 and 3 between the ring-shaped members 2 and 3 at a plurality of positions in the circumferential direction. Can change the distance.

In the present embodiment, the plurality of adjustment bolts 41 are supported by the ring-shaped member 3 through the first mounting member 42 and support the ring-shaped member 2 through the second mounting member 43. ing. Therefore, in the steel pipe connecting jig 1, when the ring-shaped members 2 and 3 and the distance changing means 4 (the plurality of adjusting bolts 41) are assembled, the integrity can be maintained.
Further, in the present embodiment, the steel pipe connecting jig 1 is lifted by a crawler crane or the like via the hanging metal fitting 27 in a state where the ring-shaped members 2 and 3 and the distance changing means 4 are integrally assembled. It can be suspended by the device.

Next, how to use the steel pipe connecting jig 1 will be described with reference to FIGS. 6 to 10 in addition to FIGS. In the following, the method of using the steel pipe connecting jig 1 will be described by taking the installation work of the steel pipe pile as an example, but the construction in which the steel pipe connecting jig 1 can be used is not limited to this.
6-8 is a figure which shows the connection method of the upper pile 110 and the lower pile 100 which comprise a steel pipe pile, and has shown the longitudinal cross-section of the steel pipe pile. FIG. 9 is a partially enlarged view of a portion P in FIG. FIG. 10 is a diagram illustrating a distance C (particularly, a route distance Cr) between the upper pile 110 and the lower pile 100, and corresponds to FIG.

  In this embodiment, the steel pipe connecting jig 1 is disposed above the lower pile 100 so that the lower end faces the upper end of the lower pile 100 extending in the vertical direction and the upper end of the lower pile 100 and extends in the vertical direction. It is used for connection with the upper pile 110 to be used. Here, the lower pile 100 is made of a steel pipe and corresponds to the “first steel pipe” of the present invention. Moreover, the upper pile 110 consists of a steel pipe, and respond | corresponds to the "2nd steel pipe" of this invention. Moreover, although the outer diameter of the lower pile 100 and the upper pile 110 is about 600 mm, for example, an outer diameter is not restricted to this.

  First, the lower pile 100 is driven into the ground by a batting method. The upper part of the lower pile 100 driven into the ground is exposed on the ground. A plurality of stopper members 102 for attaching a backing ring 101 to be described later are provided in advance on the inner peripheral surface of the upper portion of the lower pile 100 (see FIG. 6A). The stopper member 102 is formed of a steel plate and is fixed to the inner peripheral surface of the lower pile 100 by welding. Further, the plurality of stopper members 102 are arranged at intervals in the circumferential direction of the lower pile 100.

Next, as shown in FIG. 6B, the backing ring 101 is attached so as to be knocked into the lower pile 100 from the upper surface opening side of the lower pile 100. The lower part of the attached backing ring 101 is in contact with the stopper member 102, whereby the position of the backing ring 101 is maintained. Further, the upper portion of the backing ring 101 protrudes upward from the upper end of the lower pile 100 and is exposed to the outside, and the outer peripheral surface thereof can contact the inner peripheral surface of the upper pile 110. The shape and size of the backing ring 101 are shown in, for example, JIS A 5525 Annex B.
Moreover, as shown in FIG. 6B, a plurality of temporary support plates 103 are fixed to the upper portion of the lower pile 100 by welding. The temporary receiving plate 103 corresponds to the “temporary receiving member” of the present invention, and can be attached to the lower pile 100 to support the ring-shaped member 3.

  Next, as shown in FIG. 7, the steel pipe connection jig 1 assembled and integrated is suspended and lowered by a lifting device such as a crawler crane, and the lower pile 100 is placed in the ring-shaped member 3. Insert the top. At this time, the ring-shaped members 2 and 3 and the distance changing means 4 are lifted by a crawler crane or the like in an assembled state and detached from the lower pile 100 and the upper pile 110. It is suspended by a device through a suspension fitting 27. Then, the ring-shaped member 3 is fastened and fixed to the upper portion of the lower pile 100 by tightening the bolts 88. Thus, the ring-shaped member 3 is fastened and fixed to the outer peripheral surface of the upper portion of the lower pile 100 and surrounds the outer periphery of the lower pile 100. Here, the ring-shaped member 3 corresponds to the “first ring-shaped member” of the present invention.

Next, the upper pile 110 is suspended by a lifting device such as a crawler crane, the upper pile 110 is inserted into the link-like member 2 from above, and the lower end portion of the upper pile 110 is brought into contact with the backing ring 101. The upper pile 110 is moved down while the upper pile 110 is brought into contact with the upper end of the lower pile 100 (see FIGS. 8 and 9). Here, a groove portion 111 for welding is formed in advance at the lower end portion of the upper pile 110.
Next, the ring-shaped member 2 is fastened and fixed to the lower portion of the upper pile 110 by tightening the bolts 85. Thus, the ring-shaped member 2 is fastened and fixed to the outer peripheral surface of the lower portion of the upper pile 110 and surrounds the outer periphery of the upper pile 110. Here, the ring-shaped member 2 corresponds to the “second ring-shaped member” of the present invention.

Next, the adjustment bolt 41 is rotated around the central axis with respect to the first mounting member 42 and the second mounting member 43 to separate the first mounting member 42 and the second mounting member 43 from each other. (In other words, the distance between the washer 42a and the washer 43b is increased). Thereby, the distance between the ring-shaped member 3 to which the first attachment member 42 is attached and the ring-like member 2 to which the second attachment member 43 is attached is increased. The distance C between the piles 100 is increased (see FIG. 10). Incidentally, the adjustment of the interval C is appropriately rotated the adjustment bolt 41 about the central axis, it is carried out by changing the distance between the ring-shaped members 2 and 3. Therefore, in this embodiment, the distance between the ring-shaped members 2 and 3 is changed using the distance changing means 4 including the adjusting bolt 41 at a plurality of positions in the circumferential direction of the ring-shaped members 2 and 3. Thereby, the space | interval C in the several position in the circumferential direction of the upper pile 110 and the lower pile 100 can be adjusted for every the said position.

  Here, the interval C is a route interval Cr formed in order to suppress poor penetration in the welded portion when the lower end of the upper pile 110 and the upper end of the lower pile 100 are fixed by welding. This route interval Cr is preferably in the range of about 1 mm or more and about 4 mm or less.

Next, the lower end of the upper pile 110 and the upper end of the lower pile 100 are welded and fixed, and the upper pile 110 and the lower pile 100 are connected. During this welding, the tubular members 42d and 43d function as protective tubes that protect the exposed portions of the male screw portions 45 and 46 of the adjusting bolt 41 so that the exposed portions are not damaged by the welding arc.
When the welding and fixing of the lower end of the upper pile 110 and the upper end of the lower pile 100 are completed, all the locking pins 81 and 83 are then removed from the holes 25b and 35b, and all the adjustment bolts 41 are attached to the ring-shaped member. Remove from 2 and 3.

Next, after loosening the bolts 85 to separate the arc-shaped members 20 from each other, each arc-shaped member 20 is removed from the upper pile 110. Moreover, after loosening the bolt 88 and separating the arc-shaped members 30 from each other, each arc-shaped member 30 is removed from the lower pile 100.
In this way, the upper pile 110 and the lower pile 100 are connected.

Thereafter, until the steel pipe pile reaches a desired depth in the ground, the pile (steel pipe) is driven into the ground by the hammering method and the addition of a new pile (steel pipe) is repeated in the same manner as described above. When the steel pipe is added, the same steel pipe connecting jig 1 can be used.
In this manner, the steel pipe pile installation work is performed.

By the way, conventionally, after attaching the backing ring 101 to the lower pile 100 as an example of a method for maintaining the route interval Cr between the upper pile 110 and the lower pile 100, a route interval holding bead is attached to the upper end of the lower pile 100. It is known that the route interval Cr is maintained by forming this route interval holding bead between the upper pile 110 and the lower pile 100 (pile foundation construction manual 2006 revised edition (Heisei (See Japan Road Association, January 19)).
However, in such a method, the verticality of the steel pipe pile (particularly the verticality of the upper pile 110) is corrected while maintaining the root interval Cr in a state where the upper pile 110 and the lower pile 100 are not fixed to each other. The upper pile 110 may be detached from the backing ring 101.

  In this respect, in this embodiment, after attaching the backing ring 101 to the lower pile 100, the steel pipe connection jig 1 is installed on the upper pile 110 and the lower pile 100, and the upper pile 110 is rotated by rotating the adjustment bolt 41. By adjusting and fixing the distance C between the lower pile 100 and the lower pile 100, the root distance Cr necessary for welding can be maintained. In addition, the steel pipe connection jig 1 is installed on the upper pile 110 and the lower pile 100, and the vertical degree of the steel pipe pile (with the upper pile 110 supported by the lower pile 100 via the steel pipe connection jig 1) ( In particular, since the verticality of the upper pile 110 can be corrected, it is possible to suppress the upper pile 110 from being detached from the backing ring 101, and thus it is possible to improve work safety. In addition, according to the present embodiment, since the route interval Cr can be finely adjusted, the route interval Cr can be appropriately maintained, and it is not necessary to form the above-described route interval maintaining beat. In addition, the quality and homogeneity of field welding can be improved. Therefore, the steel pipe connecting jig 1 can adjust the route interval Cr at the time of on-site welding of the steel pipe pile, and can maintain the route interval Cr until the upper pile 110 and the lower pile 100 are welded and fixed. Is optimal. Moreover, the welding operation | work with the upper pile 110 and the lower pile 100 can be performed smoothly by using the jig 1 for steel pipe connection.

  According to this embodiment, the steel pipe connecting jig 1 is located above the lower pile 100 so that the lower end faces the lower pile 100 (first steel pipe) extending in the vertical direction and the upper end of the lower pile 100. It is the jig | tool used for the connection with the upper pile 110 (2nd steel pipe) arrange | positioned and extended to an up-down direction. The steel pipe connecting jig 1 is fixed to the outer peripheral surface of the upper portion of the lower pile 100 and surrounds the outer periphery of the lower pile 100 on the outer peripheral surface of the lower portion of the upper pile 110 and the ring-shaped member 3 (first ring-shaped member). The ring-shaped member 2 (second ring-shaped member) that is fixed and surrounds the outer periphery of the upper pile 110 and the distance changing means 4 that can change the distance between the ring-shaped members 2 and 3 are configured. The distance changing means 4 changes the distance at a plurality of positions in the circumferential direction of the ring-shaped members 2, 3 to change the upper pile 110 and the lower pile at a plurality of positions in the circumferential direction of the upper pile 110 and the lower pile 100. The distance C between the piles 100 can be adjusted. Therefore, in a state where the ring-shaped member 3 is fixed to the upper outer peripheral surface of the lower pile 100 and the ring-shaped member 2 is fixed to the lower outer peripheral surface of the upper pile 110, the ring-shaped members 2 and 3 are mutually connected. By changing the distance between the upper pile 110 and the lower pile 100 at a plurality of positions in the circumferential direction of the upper pile 110 and the lower pile 100 by changing the distance by the distance changing means 4. The interval can be easily adjusted.

  According to the present embodiment, the interval C is the root interval Cr, and the lower end of the upper pile 110 (second steel pipe) is welded and fixed to the upper end of the lower pile 100 (first steel pipe). Thereby, when welding and fixing the lower end of the upper pile 110 and the upper end of the lower pile 100, the penetration defect in the said welding part can be suppressed.

  Moreover, according to this embodiment, the ring-shaped member 3 (first ring-shaped member) is fastened and fixed to the outer peripheral surface of the upper portion of the lower pile 100 (first steel pipe), and the ring-shaped member 2 (second ring-shaped). The member is fastened and fixed to the lower outer peripheral surface of the upper pile 110 (second steel pipe). Thereby, the ring-shaped members 2 and 3 can be simply fixed to the upper pile 110 and the lower pile 100.

  Moreover, according to this embodiment, the ring-shaped member 3 (1st ring-shaped member) is detachably fixed to the outer peripheral surface of the upper part of the lower pile 100 (1st steel pipe), and the ring-shaped member 2 (2nd 2nd). The ring-shaped member is detachably fixed to the outer peripheral surface of the lower portion of the upper pile 110 (second steel pipe). Thereby, after using the jig 1 for steel pipe connection for the connection of the upper pile 110 and the lower pile 100, it can be diverted easily for the connection of another steel pipe with the same diameter as these.

  According to the present embodiment, the ring-shaped member 3 (first ring-shaped member) includes a plurality of arc-shaped members 30, and the ring-shaped member 2 (second ring-shaped member) includes the plurality of arc-shaped members 20. Consists of. In other words, the ring-shaped member 3 is divided into a plurality of arc-shaped members 30, and the ring-shaped member 2 is divided into a plurality of arc-shaped members 20. Thereby, since the ring-shaped members 2 and 3 which are heavy objects can be subdivided, the burden of manual work can be reduced. In the present embodiment, both the ring-shaped members 2 and 3 are divided into a plurality of arc-shaped members, but one of the ring-shaped members 2 and 3 may be divided into a plurality of arc-shaped members.

  Moreover, according to this embodiment, the distance changing means 4 is spaced from each other along the circumferential direction of the ring-shaped member 3 (first ring-shaped member) and the ring-shaped member 2 (second ring-shaped member). A plurality of adjustment bolts 41 (rod-like members) that are arranged and each extend in the vertical direction, and a lower portion of the adjustment bolt 41 provided as a ring-like member. 3 and a second mounting member 43 provided on the upper part of the adjustment bolt 41 and mounting the upper part of the adjustment bolt 41 to the ring-shaped member 2. . At least one of the first attachment member 42 and the second attachment member 43 is movable in the vertical direction with respect to the adjustment bolt 41. Thereby, the distance moving means 4 can be made into a comparatively simple structure.

  According to the present embodiment, the first mounting member 42 detachably attaches the lower part of the adjustment bolt 41 (rod-shaped member) to the ring-shaped member 3 (first ring-shaped member). The attachment member 43 detachably attaches the upper part of the adjustment bolt 41 to the ring-shaped member 2 (second ring-shaped member). Thereby, after welding with the upper pile 110 and the lower pile 100 is completed, the member 1 for steel pipe connection can be decomposed | disassembled and can be rapidly removed from a steel pipe pile.

Further, according to the present embodiment, the adjustment bolt 41 (rod-like member) includes the first male screw portion 45 constituting the lower portion thereof and the second male screw portion 46 constituting the upper portion thereof. Composed. One of the first male screw portion 45 and the second male screw portion 46 is a left-hand screw, and the other is a right-hand screw. Thus, in Rukoto appropriately rotated around the central axis the adjustment bolt 41, it is possible to change the distance between the ring-shaped members 2 and 3.

  Further, according to the present embodiment, the adjustment bolt 41 (rod-shaped member) is supported by the ring-shaped member 3 (first ring-shaped member) via the first mounting member 42, and the second mounting is performed. The ring-shaped member 2 (second ring-shaped member) is supported via the member 43. Thereby, the upper pile 110 can be supported by the lower pile 100 via the steel pipe connecting jig 1 by installing the steel pipe connecting jig 1 in the upper pile 110 and the lower pile 100.

  Further, according to the present embodiment, the ring-shaped member 2 (second ring-shaped member) includes the hanging metal fitting 27. The ring-shaped members 2 and 3 and the distance changing means 4 are in an integrally assembled state and detached from the lower pile 100 (first steel pipe) and the upper pile 110 (second steel pipe). Thus, it can be suspended via the suspension fitting 27. Thereby, the steel pipe connection jig 1 can be easily lifted and transported.

  According to the present embodiment, the steel pipe connecting jig 1 is provided on the ring-shaped member 2 (second ring-shaped member) and protrudes upward, and the upper pile 110 (second steel pipe) is connected to the ring-shaped member 2. It further includes a plate-like member 25 (guide member) including an extension 25c that can be guided therein. As a result, the upper pile 110 can be smoothly inserted into the ring-shaped member 2 even under outdoor conditions such as wind.

  Moreover, according to this embodiment, the guide part 25d with which the upper pile 110 (2nd steel pipe) can contact among the plate-shaped members 25 (guide member) containing the extension part 25c is so that it goes below, the ring-shaped member 2 It inclines so that it may go to the radial inside. That is, the guide portion 25d of the extension portion 25c of the plate-like member 25 is tapered so as to go inward in the radial direction of the ring-like member 2 as it goes downward. Thereby, the upper pile 110 can be easily inserted into the ring-shaped member 2.

  Further, according to the present embodiment, the steel pipe connecting jig 1 is attached to the lower pile 100 (first steel pipe) and supports the ring-shaped member 3 (first ring-shaped member). A receiving member). Thereby, positioning of the ring-shaped member 3 with respect to the lower pile 100 can be performed easily.

In addition, about the above-mentioned arc-shaped members 20 and 30, the burden of a manpower operation | work can be reduced by cutting a useless part and reducing a weight.
In addition, the above-described adjustment bolt 41 is preferably color-coded in order to distinguish the upper and lower sides. For example, the upper part of the adjustment bolt 41 may be painted in black, and the other part may be red in rust-preventing paint.

  In the present embodiment, the distance changing means 4 is constituted by a plurality of adjusting bolts 41, the first mounting member 42, and the second mounting member 43, but the distance between the ring-shaped members 2 and 3 is set. The configuration of the distance changing unit 4 is not limited to this as long as it can be changed. For example, the adjustment bolt 41 may be formed to be extendable and retractable like a turnbuckle.

In this embodiment, the steel pipe connecting jig 1 is used for connecting steel pipe piles. In addition, the steel pipe connecting jig 1 is a steel pipe sheet pile (for example, a pair of joint members as described in Patent Document 1). You may use for the connection of the steel pipe provided.
The illustrated embodiments are merely examples of the present invention, and the present invention is not limited to those directly described by the described embodiments, and various improvements and modifications made by those skilled in the art within the scope of the claims. Needless to say, it encompasses changes.
The claims at the beginning of the application were as follows.
Claim 1:
A first steel pipe extending in the vertical direction; and a second steel pipe extending in the vertical direction and disposed above the first steel pipe so that the lower end faces the upper end of the first steel pipe. A steel pipe connecting jig used for connection,
A first ring-shaped member fixed to the outer peripheral surface of the upper portion of the first steel pipe and surrounding the outer periphery of the first steel pipe;
A second ring-shaped member fixed to the outer peripheral surface of the lower portion of the second steel pipe and surrounding the outer periphery of the second steel pipe;
Distance changing means capable of changing a distance between the first ring-shaped member and the second ring-shaped member;
Comprising
The distance changing means changes the distance at a plurality of positions in the circumferential direction of the first ring-shaped member and the second ring-shaped member, whereby the first tube body and the second tube. The distance between the first tube and the second tube at a plurality of positions in the circumferential direction of the body can be adjusted.
Steel pipe connection jig.
Claim 2:
The steel pipe connection jig according to claim 1, wherein the interval is a route interval, and a lower end of the second steel pipe is welded and fixed to an upper end of the first steel pipe.
Claim 3:
The first ring-shaped member is fastened and fixed to the outer peripheral surface of the upper portion of the first steel pipe, and the second ring-shaped member is fastened and fixed to the outer peripheral surface of the lower portion of the second steel pipe. Or the jig for steel pipe connection of Claim 2.
Claim 4:
The first ring-shaped member is detachably fixed to the outer peripheral surface of the upper portion of the first steel pipe, and the second ring-shaped member is detachably fixed to the outer peripheral surface of the lower portion of the second steel pipe. The steel pipe connecting jig according to any one of claims 1 to 3.
Claim 5:
The steel pipe connection according to any one of claims 1 to 4, wherein at least one of the first ring-shaped member and the second ring-shaped member includes a plurality of arc-shaped members. jig.
Claim 6:
The distance changing means is
A plurality of rod-shaped members arranged at intervals from each other along the circumferential direction of the first ring-shaped member and the second ring-shaped member, and each extending vertically.
A first attachment member provided at a lower portion of the rod-shaped member and attaching the lower portion of the rod-shaped member to the first ring-shaped member;
A second attachment member provided on the upper part of the rod-like member and attaching the upper part of the rod-like member to the second ring-shaped member;
Comprising
The steel pipe according to any one of claims 1 to 5, wherein at least one of the first attachment member and the second attachment member is movable in the vertical direction with respect to the rod-shaped member. Connection jig.
Claim 7:
The first attachment member detachably attaches the lower part of the rod-like member to the first ring-like member, and the second attachment member attaches the upper part of the rod-like member to the second ring-like part. The steel pipe connecting jig according to claim 6, which is detachably attached to a member.
Claim 8:
The rod-shaped member is configured to include a first male screw portion that constitutes a lower portion thereof, and a second male screw portion that constitutes an upper portion thereof,
The steel pipe connecting jig according to claim 6 or 7, wherein one of the first male screw part and the second male screw part is a left-hand thread and the other is a right-hand thread.
Claim 9:
The rod-shaped member is supported by the first ring-shaped member via the first mounting member, and supports the second ring-shaped member via the second mounting member. The steel pipe connecting jig according to any one of claims 6 to 8.
Claim 10:
The second ring-shaped member includes a hanging metal fitting,
The first ring-shaped member, the second ring-shaped member, and the distance changing means are integrally assembled and detached from the first steel pipe and the second steel pipe. The steel pipe connecting jig according to any one of claims 1 to 9, wherein the jig can be suspended via the suspension fitting in a state.
Claim 11:
The structure according to claim 1, further comprising a guide member provided on the second ring-shaped member and protruding upward and capable of guiding the second steel pipe into the second ring-shaped member. The steel pipe connecting jig according to any one of the above.
Claim 12:
12. The steel pipe according to claim 11, wherein a guide portion with which the second steel pipe can come in contact with the guide member is inclined so as to be directed radially inward of the second ring-shaped member as it goes downward. Connection jig.
Claim 13:
The steel pipe connecting jig according to any one of claims 1 to 12, further comprising a temporary support member attached to the first steel pipe and supporting the first ring-shaped member. .

  DESCRIPTION OF SYMBOLS 1 ... Steel pipe connection jig | tool, 2 ... Ring-shaped member (2nd ring-shaped member), 3 ... Ring-shaped member (1st ring-shaped member), 4 ... Distance changing means, 20 ... Arc-shaped member, 21 ... Main body Part, 22 ... lower flange part, 22a ... area, 22b ... extension part, 23 ... end plate, 23a ... through hole, 24 ... hole part, 25 ... plate-like member, 25a ... extension part, 25b ... hole part, 25c ... Extension part, 25d ... Guide part, 26 ... Through hole, 27 ... Suspension fitting, 27a ... Through hole, 30 ... Arc member, 31 ... Body part, 32 ... Upper flange part, 32a ... Area, 32b ... Extension part, 33 ... End plate, 33a ... through hole, 34 ... hole, 35 ... plate-like member, 35a ... extension, 35b ... hole, 36 ... through hole, 37 ... hanging bracket, 37a ... through hole, 41 ... adjustment bolt ( Rod-shaped member), 42... First mounting member, 42 a and 42 b. ... Cylindrical member, 42d ... Tubular member, 43 ... Second mounting member, 43a, 43b ... Washer, 43c ... Cylindrical member, 43d ... Tubular member, 45 ... First male screw part, 46 ... Second male screw part , 47 ... nuts, 81, 83 ... locking pins, 85 ... bolts, 86 ... nuts, 88 ... bolts, 89 ... nuts, 100 ... lower pile (first steel pipe), 101 ... backing ring, 102 ... stopper member , 103 ... Temporary receiving plate (temporary receiving member), 110 ... Upper pile (second steel pipe), 111 ... Groove, C ... Interval, Cr ... Route interval

Claims (12)

A first steel pipe extending in the vertical direction, and the second steel tube extending in the vertical direction lower end to the upper end of the first steel tube is arranged above the first steel pipe so as to face the A way to connect to each other,
The first steel pipe and the second steel pipe constitute a steel pipe pile,
The steel pipe connecting jig used for the connection is
A first ring-shaped member fixed to the outer peripheral surface of the upper portion of the first steel pipe and surrounding the outer periphery of the first steel pipe;
A second ring-shaped member fixed to the outer peripheral surface of the lower portion of the second steel pipe and surrounding the outer periphery of the second steel pipe;
Distance changing means capable of changing a distance between the first ring-shaped member and the second ring-shaped member;
Comprising
The distance changing means changes the distances at a plurality of positions in the circumferential direction of the first ring-shaped member and the second ring-shaped member, whereby the first steel pipe and the second steel pipe are changed. adjustable der route distance between the second steel pipe and the first steel pipe at a plurality of positions in the circumferential direction is,
The method
A first step of driving the first steel pipe into the ground;
A second step of fixing the first ring-shaped member to the outer peripheral surface of the upper portion of the first steel pipe exposed on the ground after the first step;
A third step of bringing the lower end of the second steel pipe into contact with the upper end of the first steel pipe after the second step;
A fourth step of fixing the second ring-shaped member to the lower outer peripheral surface of the second steel pipe after the third step;
A fifth step of adjusting the route interval by increasing the distance by the distance changing means after the fourth step;
A sixth step of welding and fixing the lower end of the second steel pipe to the upper end of the first steel pipe after the fifth step;
including,
Steel pipe connection method. In the second step, the clamping and fixing the first ring-shaped member on the outer peripheral surface of the upper portion of the front Symbol first steel pipe,
Wherein in the fourth step, the second ring-shaped fastening member is fixed to the outer peripheral surface of the lower portion of the front Stories second steel pipe, a method of connecting the steel pipe according to claim 1. In the second step, detachably fixed to the first ring-shaped member on the outer peripheral surface of the upper portion of the front Symbol first steel pipe,
Wherein in the fourth step, the second ring-shaped member detachably fixed to the outer peripheral surface of the lower portion of the front Stories second steel pipe, a method of connecting the steel pipe according to claim 1 or claim 2. The steel pipe connection according to any one of claims 1 to 3 , wherein at least one of the first ring-shaped member and the second ring-shaped member includes a plurality of arc-shaped members. Way . The distance changing means is
A plurality of rod-shaped members arranged at intervals from each other along the circumferential direction of the first ring-shaped member and the second ring-shaped member, and each extending vertically.
A first attachment member provided at a lower portion of the rod-shaped member and attaching the lower portion of the rod-shaped member to the first ring-shaped member;
A second attachment member provided on the upper part of the rod-like member and attaching the upper part of the rod-like member to the second ring-shaped member;
Comprising
The steel pipe according to any one of claims 1 to 4 , wherein at least one of the first attachment member and the second attachment member is movable in a vertical direction with respect to the rod-shaped member. Connection method . The first attachment member detachably attaches the lower part of the rod-like member to the first ring-like member, and the second attachment member attaches the upper part of the rod-like member to the second ring-like part. The steel pipe connection method according to claim 5 , wherein the steel pipe is detachably attached to the member. The rod-shaped member is configured to include a first male screw portion that constitutes a lower portion thereof, and a second male screw portion that constitutes an upper portion thereof,
The steel pipe connection method according to claim 5 or 6 , wherein one of the first male screw part and the second male screw part is a left-hand thread and the other is a right-hand thread. The rod-like member is supported by the first ring-shaped member via said first mounting member, and supports the second ring-shaped member through said second attachment member, claim The method for connecting steel pipes according to any one of claims 5 to 7 . The second ring-shaped member includes a hanging metal fitting,
The method comprising: after the first step, and said prior to the second step, the first and the one body to the ring-shaped member and the second ring-shaped member and the distance changing means Including inserting the upper part of the first steel pipe into the first ring-shaped member by suspending and lowering the steel pipe connection jig in an assembled state via the suspension fitting , The method for connecting steel pipes according to any one of claims 1 to 8 . The steel pipe connecting jig further includes a guide member provided on the second ring-shaped member and protruding upward ,
Prior to bringing the lower end of the second steel pipe into contact with the upper end of the first steel pipe in the third step, the guide member moves the second steel pipe from above the second ring-shaped member. Can be guided into the second ring-shaped member ;
The guide part with which the said 2nd steel pipe can contact among the said guide members inclines so that it may go to the radial inside of a said 2nd ring-shaped member, so that it goes below. The connection method of the steel pipe as described in any one of these . The method for connecting steel pipes according to any one of claims 1 to 10, comprising attaching a backing ring to an inner peripheral surface of an upper part of the first steel pipe prior to the second step. Prior to the second step comprises attaching the first ring-shaped member a supportable temporary supporting member on the outer peripheral surface of the upper portion of the first steel tube, any one of claims 1 to 11 1 Steel pipe connection method described in one.