JP2009052399A - Jig for steel pipe positioning and method for steel pipe immersion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To economically and efficiently immerse, while rotating, a pile or a sheet pile embedded in the ground. <P>SOLUTION: A cylindrical jig body with a joint 3 engaged with a joint 4 at an upper end of a steel pipe 1 for positioning construction is provided. Furthermore, a hoist fitting for slinging up the jig body is also used as a rotary metal fitting 6 for rotating the jig body around the cylinder axis, and is integrally and convertibly provided with the jig body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a steel pipe erection jig and a steel pipe laying method, and more specifically, a steel pipe erection jig applied when a steel pipe used as a pile or a sheet pile is installed in the ground while rotating as necessary. The present invention relates to a tool and a steel pipe settling method.

  In recent years, steel pipes have been widely used as piles and sheet piles. Conventionally, as a method of installing steel pipes underground as piles and sheet piles, a steel pipe is built vertically on the ground and the head is hit with a hammer. Also known are the embedding method in which a steel pipe is inserted into a hole formed in the ground in advance with an earth auger, the method of sinking a steel pipe pile while building a soil cement column, and the method of inserting a steel pipe pile after building a soil cement column. It has been.

  For this reason, the hanging metal fitting for suspending a steel pipe and building in a pile construction machine is normally projected on the upper side surface of the steel pipe. In particular, when the steel pipe is inserted into the ground while rotating, a rotating metal fitting that receives the rotational force from the pile construction machine is provided in addition to the hanging metal fitting.

  By the way, as a method of joining steel pipes, a mechanical joint has recently been demanded rather than a welded joint from the viewpoint of reliability in field welding and management problems.

  Various types of mechanical joints have been developed so far. In particular, a male / female fitting type mechanical joint (for example, see Patent Document 1), which has been developed by the present applicant and has been applied for, is a joint connection. Since it is easy to clean mud etc., it is constructed by forming a male joint on the lower steel pipe joined up and down and a female joint on the upper steel pipe.

JP 11-36285 A

  However, since both the hanging metal fitting and the rotating metal fitting need to be attached to the upper side surface of each steel pipe by welding, there are problems such as a great amount of labor and cost for the production and attachment of these metal fittings.

  In addition, when a steel pipe having a male / female fitting type mechanical joint is inserted into the ground while rotating, a rotating cap for rotation force transmission provided in the pile construction machine is fixed to the upper part of the steel pipe pile. It is necessary to fit the metal fittings for rotation, but the metal fittings for rotation protrude from the lower part of the male joint. There have been problems such as failure to fit or damage to the male joint by contact with the male joint.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and in particular, a steel pipe erection treatment that enables the construction and subsidence of a steel pipe installed in the ground as a pile or a sheet pile to be rotated extremely efficiently. Is to provide tools and steel pipe laying method.

  As illustrated in FIGS. 1 and 2, the first characteristic configuration of the present invention is at least two at the lower end of the joint engaged with the joint formed at the upper end of the steel pipe 1 installed as a pile or a sheet pile. The rotating metal fittings 6 are respectively provided on the outer periphery.

According to the 1st characteristic structure of this invention, the subsidence construction installed in the ground as a pile or a sheet pile can be performed very economically and efficiently, especially rotating.
In other words, in the past, it was necessary to attach an extremely thick metal fitting for rotation to the upper side of each steel pipe by welding, so the number of metal fittings for rotation increased accordingly, making it possible to manufacture the metal fittings for rotation and attach them to each steel pipe. It took a lot of labor and cost.
However, in the case of the present invention that uses a steel pipe erection jig with a rotating metal fitting attached to the outer periphery, the steel pipe erection jig is simply engaged and connected to a joint formed on the upper end of the steel pipe. Therefore, it is possible to use the same structure as that provided with a metal fitting for rotation on the upper side surface of the steel pipe, and after the construction, the engagement connection of the steel pipe erection jig can be released and used repeatedly. It is no longer necessary to provide the steel pipe itself with extra-thickness metal fittings that had to be attached to the upper side surfaces of the steel pipes by welding in advance during installation and subsidence work, and the number thereof can be greatly omitted.
In addition, the steel pipe erection jig can be engaged and connected to a joint formed on the upper end of the steel pipe, and it only needs to be long enough to attach a metal fitting for rotation to the outer periphery. The length of the jig axis in the pile axis direction can be reduced. Therefore, even if the steel pipe erection jig is used for a long steel pipe, the entire structure of the steel pipe can be made the same as that provided on the upper end side surface of the steel pipe without becoming so long.
As a result, it is possible to provide a steel pipe erection jig that can be used regardless of the length of the steel pipe, can greatly reduce the cost, and can improve the workability of the installation work.

  As illustrated in FIGS. 1 and 2, the second characteristic configuration of the present invention is that the rotating metal fitting 6 has a through hole 6 a.

According to the second characteristic configuration of the present invention, in addition to achieving the above-described operational effects of the first characteristic configuration of the present invention, the steel pipe erection jig can be moved without providing a separate support portion. The suspension can be supported as possible.
In other words, when trying to fit and connect a steel pipe erection jig to the joint formed at the upper end of the steel pipe, it is necessary to fit both of them by proximity movement in the axial direction of the steel pipe. It is necessary to support the jig for movement. Therefore, it is necessary to provide a support part for the steel pipe erection jig. However, in the present invention, it is only necessary to provide a through hole in the rotating bracket. Therefore, the steel pipe erection jig can be suspended and supported without being provided with a separate support portion.
As a result, it is possible to make the rotating bracket also serve as a hanging bracket when hanging and supporting a steel pipe erection jig, so that the number of parts can be reduced, compared to a separate support portion. As a result, it is possible to reduce the installation effort and member cost.

  The third characteristic configuration of the present invention is that the joint engaged with the joint formed on the upper end portion of the steel pipe 1 is a female joint 3 as illustrated in FIGS.

According to the third characteristic configuration of the present invention, it is possible to prevent the male joint from being damaged, in addition to achieving the above-described operational effects of the first or second characteristic configuration of the present invention.
In other words, for example, when a male joint is provided at the upper end of a steel pipe as in the prior art and a rotating bracket is projected from the lower part of the male joint, a rotating cap for transmitting torque is fitted into the rotating bracket. When trying to match, there was a possibility that the male joint could get in the way and could not be fitted to the rotating bracket, or the rotating cap could come into contact with the male joint and damage the male joint.
In addition, when the male joint is damaged, not only does it take a long time to repair, but if the damage is severe, it takes time to replace the steel pipe itself.
However, according to the present invention, the male joint can be protected from being exposed to the outside by fitting the female joint of the steel pipe erection jig. It is possible to prevent the male joint from being damaged due to contact.
As a result, there is no need to repair the male joint or replace the steel pipe itself, so that the workability of the laying work by the construction and rotation of the steel pipe can be improved.

  As illustrated in FIG. 6, the fourth characteristic configuration of the present invention is a steel pipe erection jig 14 according to claim 1, 2, or 3 at a joint formed at an upper end portion of a steel pipe 1 installed as a pile or a sheet pile. And then fitting the rotating metal fitting 6 to the rotating cap 18 of the pile construction machine, and setting the steel pipe 1 in the ground while rotating the steel pipe 1 with the rotating cap 18 as necessary. is there.

According to the 4th characteristic structure of this invention, the substituting construction of the steel pipe installed in the ground as a pile or a sheet pile can be performed very economically and efficiently, especially rotating.
In other words, in the case of the present invention that uses a steel pipe erection jig with a rotating metal fitting attached to the outer peripheral part, only the steel pipe erection jig is fitted and connected to a joint formed at the upper end of the steel pipe. The steel pipe can be installed in the same way as the one provided with the rotating metal fitting on the upper side of the steel pipe, and after the construction, the steel pipe erection jig can be released and repeatedly used. During construction, it is no longer necessary to install extra-thick rotating metal fittings on the steel pipe itself, which had to be attached to the upper side surface of each steel pipe in advance. By fitting the female joint of the jig, it is possible to protect the male joint provided at the upper end of the steel pipe from being exposed to the outside, so when trying to fit the rotating cap to the rotating bracket, If the fitting gets in the way or Possible to prevent such they would damage the male joint and.
As a result, it has become possible to provide a steel pipe laying method that can improve the workability of the laying work and can greatly reduce the cost.

  As illustrated in FIG. 6, the fifth characteristic configuration of the present invention is characterized in that the joint and the hanging metal fitting 5 protrude from the upper end portion, respectively, and the upper end portion of the steel pipe 1 installed as a pile or a sheet pile is Two or three steel pipe erection jigs 14 are attached by fitting both the joints, and then the steel pipe 1 is lifted together with the steel pipe erection jig 14 using the hoisting bracket 5 and then installed. The rotating metal fitting 6 is fitted into the rotating cap 18 of the pile construction machine, and the steel pipe 1 is then submerged in the ground while rotating the steel pipe 1 with the rotating cap 18 as necessary.

According to the fifth characteristic configuration of the present invention, it is possible to extremely efficiently and efficiently perform the erection and substituting work of the steel pipe that is installed in the ground as a pile or a sheet pile in particular while being rotated.
In other words, in the case of the present invention that uses a steel pipe erection jig with a rotating metal fitting attached to the outer peripheral part, only the steel pipe erection jig is fitted and connected to a joint formed at the upper end of the steel pipe. Since the steel pipe erection jig can be used repeatedly after the construction, it is possible to use the steel pipe erection on the upper side of the steel pipe. It is no longer necessary to disengage and connect the extra-thick rotating metal fittings that had to be welded to the upper side surface of the steel pipe, so that the number of steel pipes can be greatly reduced, and for suspension purposes. A steel pipe can be lifted and built together with a steel pipe erection jig using a metal fitting.
By fitting and connecting the female joint of the steel pipe erection jig to the male joint provided at the upper end of the steel pipe, it is possible to protect the male joint from being exposed to the outside. It is possible to prevent the male joint from getting in the way or coming into contact and damaging the male joint when trying to do so.
As a result, it has become possible to provide a steel pipe laying method that can improve the workability of the laying work by erection and rotation of the steel pipe and can achieve a significant cost reduction.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 5 show an example of a steel pipe erection jig according to the present invention. In the figure, as a mechanical joint at the lower end of a cylindrical body 2 having the same diameter as a steel pipe 1 used as a pile or a sheet pile. One female joint 3 of the male-female fitting type joint is projected, and the other male joint 4 joined to the female joint 3 is projected from the upper end portion of the steel pipe 1 together with the hanging fitting 5.

  Moreover, when inserting the steel pipe 1 into the ground while rotating the steel pipe 1 by an embedding method or the like on the outer peripheral portion of the cylindrical body 2, a rotating metal fitting 6 that receives a rotational force from a pile construction machine is projected.

  The cylindrical body 2 is formed from a steel pipe having substantially the same outer diameter as that of the steel pipe 1, while the female joint 3 is formed by casting or forging, or machining a thick steel pipe, and is formed at the lower end of the cylindrical body 2. It is welded together. The cylindrical body 2 may be formed by casting or the like in the same manner as the female joint 3, and the female joint 3 may be directly formed at the lower end portion of the cylindrical body 2.

  At least one key groove 7 is formed inside the female joint 3, and a ring key 8 is inserted into the key groove 7. The key grooves 7 are continuous for a predetermined length in the circumferential direction of the female joint 3 and are formed at predetermined intervals in the circumferential direction of the female joint 3, or are annular (ring-shaped) in the circumferential direction of the female joint 3 In any case, it is formed in one stage or a plurality of stages (for example, two stages).

  The ring key 8 is formed in a size (cross section and length) that can sufficiently withstand the load when the steel pipe 1 is suspended, and is continuous for a predetermined length along the circumferential direction of the female joint 3, for example, and the key groove 7 It is formed in a rectangular cross-sectional shape, a convex cross-sectional shape, or a concave cross-sectional shape that is large enough to fit inside.

  Further, the set bolt 9 is screwed into the key groove 7 from the outside of the female joint 3, and the tip of the set bolt 9 is connected to the ring key 8, so that the ring key 8 is inserted into the key groove 7. Is retained.

  Then, by appropriately turning the set bolt 9 left and right, the ring key 8 moves in the radial direction of the female joint 3 to engage with the key groove 10 of the male joint 4, and the engagement with the key groove 10 is released. It has become so.

  Similar to the female joint 3, the male joint 4 is formed by casting or forging, or machining a thick steel pipe, and is integrally welded to the upper end of the steel pipe 1.

  Further, the substantially upper half 4a of the male joint 4 is formed to have an outer diameter that can be inserted into the female joint 3, and the above-described key groove 10 is formed on the outer peripheral portion of the upper half 4a. The key groove 10 is continuously formed annularly in the circumferential direction of the male joint 4, and is formed in one or a plurality of stages (for example, two stages) according to the key groove 7 of the female joint 3.

  A plurality of key slits 11 (eight in this embodiment) are formed in the lower end portion of the female joint 3 and the upper end portion of the male joint 4, respectively. The key slits 11 extend over both the female joint 3 and the male joint 4 and are formed at predetermined intervals in the circumferential direction of the female joint 3 and the male joint 4. (See Figure 15)

  The rotation restraining key 12 is fitted into the key slit 11 so as to straddle both the key slits 11, so that the steel pipe 1 is connected from the female joint 3 side to the male joint 4 side and eventually from the cylindrical body 2 side. The rotational force is transmitted to the side.

  The rotation suppression key 12 is fixed in the key slit 11 by a fixing bolt 13 or simple welding.

  One or more rotating metal fittings 6 project from the outer periphery of the cylindrical body 2 by welding. The rotating metal fitting 6 is formed with a through hole 6a for passing a suspension wire or the like so as to serve as a metal fitting for hanging a steel pipe erection jig (hereinafter referred to as “jig 14”). Yes.

  Further, as shown in FIG. 6, for example, the jig 14 is hung from the upper end of the steel pipe 1 in a state where the steel pipe 1 is temporarily placed sideways, so that the jig 14 can be lifted even when the portion of the rotating metal fitting 6 is lifted. The rotating metal fitting 6 protrudes on a line passing through the center of gravity of the jig 14 so that 14 maintains a horizontal state.

  The hanging metal fitting 5 is a set of two metal fittings facing each other on the horizontal axis passing through the center of the steel pipe 1 and fixed to the outer periphery of the upper end of the steel pipe 1 by welding or the like. It is installed.

  In the above description, the female joint 3 and the male joint 4 of the male and female fitting type joints are provided as the mechanical joints on the jig 14 side and the steel pipe 1 side, respectively. However, the present invention is not limited to this type of mechanical joint. Alternatively, for example, a simple mechanical joint including a male screw and a screw hole may be provided.

  4 and 5 show another example of the ring key 8. FIG. 4 shows an example in which the upper and lower ring keys 8 are integrally formed and the set bolt 9 is also used, and FIG. An example in which the keys 8 are arranged in one row is shown.

  Next, a method for setting the steel pipe 1 installed in the ground as a pile or the like using the jig 14 according to the present invention will be described with reference to FIGS. 6 (a) to 6 (g).

[1] In advance, all the ring keys 8 of the jig 14 are inserted into the key grooves 7, and the steel pipe 1 is laid down substantially horizontally on the ground.

[2] Next, the jig 14 is suspended by a crane 15 or the like near the side of the steel pipe 1 having the male joint 4. Then, the jig 14 is aligned so that both the material axes coincide with each other by human power, and the jig 14 is pulled to the steel pipe 1 side to fit the tip side half 4a of the male joint 4 with the female joint 3.
At that time, the hook 15 a of the crane 15 is hooked on the suspension wire 16 that is passed through the hole 6 a of the rotating bracket 6 of the jig 14, but the rotating bracket 6 protrudes from the center of gravity of the jig 14. Thus, since the jig 14 is kept in a horizontal state even when suspended, and the axis of the jig 14 can be easily rotated so as to coincide with the axis of the steel pipe 1, the alignment of the jig 14 and the female The fitting between the metal fitting 3 and the male metal fitting 4 can be performed very easily. For example, as shown in FIG. 6 (e), the jig 14 may be hung only by one rotating metal fitting 6.

[3] Next, the set bolt 9 is tightened so that the ring key 8 protrudes from the key groove 7 and the tip side is engaged with the key groove 10 of the male joint 4. Moreover, the rotation suppression key 12 straddling both in the key slit 11 of the female joint 3 and the male joint 4 is each fitted, and it fixes by the fixing bolt 13, respectively.
The rotation restraining key 12 may be fixed with a simple bolt, but it is easier to connect and disconnect the jig 14 and the steel pipe 1 by welding to the jig 14.
With the above operation, the jig 14 is completely fixed to the upper end portion of the steel pipe 1, and the attachment of the jig 14 is completed.

[4] Next, the hook 15 a of the crane 15 is replaced with a hanging wire 16 attached to the hanging metal fitting 5 protruding from the upper end of the steel pipe 1.

[5] Next, the steel pipe 1 is gradually lifted with the crane 15 together with the jig 14, and then raised to the ground, and connected to a pile construction machine (not shown).

[6] Next, as shown in FIGS. 6 (f) and 6 (g), for example, the rotating metal fitting 6 is fitted into the rotating cap 18 for transmitting the rotational force provided in the pile construction machine. . Then, the pile construction machine is driven, and the steel pipe 1 is rotated by the rotating cap 18 and is submerged in the ground. Note that the rotation cap 18 illustrated in FIG. 6F is used when the hole for sinking the steel pipe 1 is first excavated, and then the steel pipe 1 is set in the hole excavated earlier. .
Further, the rotating cap 18 shown in FIG. 6 (g) is used when simultaneously performing the setting work of the steel pipe 1 and the excavation work of the hole for setting the steel pipe 1, and for this reason, the center of the rotating cap 18 is used. An opening 18a for passing a connecting rod such as an earth auger is provided in the portion, and the upper part is connected to an auger motor (not shown) for rotation. In addition, when the steel pipe 1 is set as a sheet pile in the ground, the steel pipe 1 does not need to be rotated.

[7] Next, when the installation of the steel pipe 1 is completed, the fixing bolt 13 is loosened as necessary to remove the rotation restraining key 12, and the set bolt 9 is loosened to connect the ring key 8 to the key of the male joint 4. The ring key 8 and the key groove 10 are disengaged from the groove 10.

  With the above operation, the jig 14 is completely released from the upper end portion of the steel pipe 1, and the removal of the jig 14 is completed. Therefore, the female joint 3 and the male joint 4 are disengaged simply by pulling up the jig 14, and the jig 14 is separated from the upper end portion of the steel pipe 1.

  In the same manner, the second and third pipes 1 and many steel pipes 1 can be built and set up very efficiently using one jig 14.

  In the above construction method, when the upper and lower steel pipes 1 are joined by a male and female fitting type mechanical joint, a female joint 3 is provided for the upper steel pipe 1, and a male joint 4 is provided for the lower steel pipe 1. Although it is protruding, it is necessary to protect the joint until the steel pipe 1 is installed in the ground as a pile or a sheet pile. For example, as shown in FIGS. However, a curing cap 20 is attached to each male joint 4.

  The curing caps 19 and 20 are each formed in a ring shape having substantially the same diameter as the female joint 3 and the male joint 4, and are formed in a substantially groove shape in cross section so that the female joint 3 and the male joint 4 can be inserted.

  Further, the curing cap 19 is screwed with a fixing screw 21 protruding into the groove-shaped portion 19a from the inside, and the curing cap 20 is screwed with a fixing screw 22 protruding into the groove-shaped portion 20a from the outside. The fixing screw 21 is screwed to a fixing nut 23 welded to the inside of the curing cap 19, and the fixing screw 22 is screwed to a fixing nut 24 welded to the outside of the curing cap 20.

  Further, the curing caps 19 and 20 attached to the female joint 3 and the male joint 4, respectively, are fastened to the female joint 3 and the male joint 4 by tightening the fixing screws 21 and 22 and projecting their tips into the key grooves 7 and 10, respectively. Temporarily fixed.

  Further, the curing caps 19 and 20 can be easily detached from the female joint 3 and the male joint 4 by loosening the fixing screws 21 and 22 and pulling out the tips thereof from the key grooves 7 and 10.

  Further, when joining the next steel pipe to the upper end of the steel pipe 1 submerged in the ground, for example, as shown in FIG. 9, a cradle 25 is installed at the upper end of the steel pipe 1 submerged in the ground. And the sinking | hanging of the steel pipe 1 can be prevented by latching the metal fitting 5 for protrusion projected from the upper end part of the steel pipe 1 on this cradle 25. FIG.

[Another embodiment]
Other embodiments will be described below.

<1> The curing cap is formed in an integral ring shape having substantially the same diameter as the female joint 3 described in the previous embodiment, and the female joint 3 is inserted into the annular groove, and the fixing screw 21 is tightened from the inside. For example, as shown in FIG. 10, a plurality of split rings 27 (three splits in the present embodiment) have the same diameter as the female joint 3. In addition to being formed in a ring shape, each of the split rings 27 is provided with a plurality of fixing screw mounting pieces 27a (two in this embodiment for one split ring 27), and between the split ring 27 and the fixing screw mounting pieces 27a. The female joint 3 is inserted into the female joint 3, and the curing cap 26 is temporarily fixed to the female joint 3 by tightening the fixing screw 21 screwed into the fixing nut 23 welded to the outer side of the fixing screw mounting piece 27a. It may be a thing.
In this case, since the curing cap 26 is formed by a plurality of split rings 27, each of the weights can be reduced as compared with the integral ring-shaped curing cap, so that the mounting operation to the female joint 3 is easy. In addition, since the fixing screw mounting piece 27a is partially provided, the material for forming the curing cap 26 can be reduced as compared with that provided on the entire outer periphery of the ring. It can be suppressed and the weight can be reduced.
Further, since the fixing screw 21 is tightened from the outside, the screw head does not protrude into the female joint 3, and the tapered surface 27b is formed on the inner peripheral surface of the curing cap 26, thereby excavating. When inserting a rotating rod or the like equipped with a device, a stirring device or the like into the steel pipe 1, not only is it caught on the screw head, but also the guide can be guided by the tapered surface 27b.
<2> The curing cap is formed in an integral ring shape having substantially the same diameter as the male joint 4 described in the previous embodiment, and the male coupling 4 is inserted into the annular groove, and the curing cap 20 is fixed by the fixing screw 22. For example, as shown in FIG. 11, a plurality of split rings 29 (in this embodiment, three splits) form a ring having substantially the same diameter as the male joint 4. At the same time, each of the split rings is provided with a plurality of locking pieces 29a (two in this embodiment for one split ring 29), and the male joint 4 is inserted between the split ring 29 and the locking pieces 29a. Then, the configuration may be such that the curing cap 28 is temporarily fixed to the male joint 4 by tightening the fixing screw 22 screwed into the fixing nut 24 welded to the outside of the split ring 29 from the outside.
In this case, since the curing cap 28 is formed by a plurality of split rings 29, each of the weights can be reduced as compared with the integral ring-shaped curing cap, so that the mounting work to the male joint 4 is easy. In addition, since the locking piece 29a is partially provided, the material for forming the curing cap 28 can be reduced as compared with that provided on the entire inner periphery of the ring. It can be suppressed and the weight can be reduced.
Each split ring 29 is provided with a convex portion 29b that can be fitted and engaged with the annular concave portion 4a of the male joint 4 formed to stabilize the posture when the male joint 4 and the female joint 3 are fitted. It may be a configuration. In this case, the posture of the curing cap 28 when temporarily fixed can be stabilized.
The tightening with the fixing screw 22 is not limited to the one performed from the outside. The fixing nut 24 is welded to the locking piece 29a, and the fixing screw 22 is screwed into the fixing nut 24 and tightened from the inside to tighten the male joint 4. Alternatively, the curing cap 28 may be temporarily fixed.
<3> The tapered surface 27b of the curing cap 26 attached to the female joint 3 is not limited to the one in which the same thickness plate described in the above embodiment is bent inward to form the tapered surface 27b. For example, FIG. As shown, a thick tapered surface 27b that contacts the inner peripheral surface 3A of the female joint may be formed on the inner surface of the curing cap 26.
In this case, it is possible to make it difficult to deform the tapered surface 27b even if it comes into intense contact with the tapered surface 27b when a rotating rod or the like equipped with a drilling device or a stirring device is inserted into the steel pipe 1.
<4> The shape of the curing cap 26 is not limited to that described in the above embodiment. In addition to the configuration of the above embodiment, for example, as shown in FIG. In order to stabilize the posture at this time, a convex portion 27c that can be fitted and engaged with the annular concave portion 3a of the female joint 3 may be provided. In this case, the posture of the curing cap 26 when temporarily fixed can be further stabilized by not only tightening the fixing screw 21 but also engaging and engaging the convex portion 27c with the annular concave portion 3a of the female joint 3. .
<5> In the above embodiment, the rotation suppression key 12 is fitted in a state straddling both the key slits 11 and fixed in the key slit 11 by the two fixing bolts 13 or simple welding, and the cylinder 2 and the steel pipe 1 is described so that the rotational force is transmitted from the cylindrical body 2 side to the steel pipe 1 side. However, the number of fixing bolts 13 is not limited to two, and FIG. As shown in the drawing, the rotation restraining key 12 may be attached with a single fixing bolt 13.
That is, by reducing the gap when the rotation suppression key 12 is fitted in a state straddling both the key slits 11, it is possible to prevent the rotation suppression key 12 itself from swinging around the fixing bolt 13 as a key. Since the engagement with the slit 11 can be prevented from being disengaged, it is possible to prevent relative rotation between the cylindrical body 2 and the steel pipe 1 with a single fixing bolt 13. And since the number of the fixing bolts 13 can be reduced, the workability of the mounting work when the rotation suppression key 12 is attached can be improved.
<6> In the above embodiment, the through hole 6a is formed in each of the two rotating metal fittings 6 that are welded and protruded from the outer peripheral portion of the cylindrical body 2, and the jig 14 passes through the through hole 6a through the suspension wire 16. However, not only the rotating bracket 6 but also the through hole 30a for passing the suspension wire 16 through the inner peripheral surface of the cylindrical body 2 as shown in FIGS. A plurality of hanging metal fittings 30 (three in this embodiment) are formed by welding and projecting through the through holes 6 a of the rotating metal fittings 6 and the through holes 30 a of the hanging metal fittings 30 through the suspension wires 16. The thing of the structure which lifts the tool 14 may be sufficient.
In this case, the posture of the lifted jig 14 can be stabilized as compared with a structure in which the jig 14 is lifted by only two rotating metal fittings 6.
In other words, if the jig 14 is supported only by the two rotating brackets 6, the suspension position of the jig 14 is likely to be unstable because it is supported at two points. Since the number of support points for supporting the tool 14 is increased (in this embodiment, it is five-point support), the hanging posture of the jig 14 can be stabilized. (See Figure 18)
In addition, the number which provides the metal fitting 30 for a suspension on the internal peripheral surface of the cylinder 2 is not limited to the structure of the said embodiment, The number is arbitrary.
<7> Further, the jig 14 may be provided with a handle portion 31 that can be moved back and forth from the outer peripheral surface of the cylindrical body as shown in FIGS. 15, 17, and 18.
The handle 31 is inserted into a handle opening 2A formed in the cylindrical body 2 by inserting a bar 32 bent into a U-shape, and the bar 32 is projected from the outer peripheral surface of the cylindrical body. It is formed by welding and fixing nuts 33 or the like at both ends so that the bar 32 does not come out of the cylinder 2 by coming into contact with the peripheral surface.
Then, when the jig 14 is lifted by the suspension wire 16 and conveyed, or when the female joint 3 of the jig 14 is fitted to the male joint 4 of the steel pipe 1, the handle portion 31 is pulled out from the cylindrical body 2 (see FIG. 17 (a)), the gripping operation of the operator with respect to the handle portion 31 can stabilize the transport posture during the transport of the jig 14 and facilitate the alignment of the joints.
Further, when it is not necessary, the handle portion 31 can be retracted into the cylindrical body 2 (see FIG. 17B) to prevent other work from being obstructed.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry.

An exploded perspective view showing an example of a steel pipe erection jig An example of a steel pipe installation jig is shown, (a) is a plan view thereof, and (b) is a partially cutaway sectional front view thereof. Longitudinal sectional view showing a part of female joint Longitudinal section showing a part of the male joint The other example of the jig for steel pipe installation is shown, (a) is the top view, (b) is the partially notched cross section front view (A) ~ (g) is a process diagram showing a method for laying a steel pipe using a steel pipe installation jig The curing cap of the female joint is shown, (a) is a perspective view thereof, (b) is a partially cutaway side view. A male joint curing cap is shown, (a) is a perspective view thereof, (b) is a partially cutaway side view. The method of joining upper and lower steel pipes is shown, (a) is a front view thereof, and (b) is a plan view. The other example of the curing cap of a female joint is shown, (a) is the perspective view, (b) is a partially cutaway side view Another example of a male cap curing cap is shown, (a) is a perspective view thereof, (b) is a partially enlarged sectional view. Partial expanded sectional view which shows the other example of the curing cap of a female joint Partial expanded sectional view which shows the other example of the curing cap of a female joint Exploded perspective view showing another example of steel pipe erection jig Bottom view showing another example of steel pipe erection jig Vertical side view showing another example of steel pipe erection jig The handle part provided in the steel pipe erection jig is shown, (a) is its retracted state, (b) is a partially enlarged sectional view showing its protruding state Side view showing another example of steel pipe erection jig

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel pipe used as a pile or a sheet pile 3 Female joint 5 Hanging bracket 6 Rotating bracket 6a Through hole 14 Jig (steel pipe erection jig)
18 Rotating cap

Claims (3)

  A cylindrical jig body provided with a joint to be engaged with a joint at the upper end of a steel pipe for erection is provided, a hanging metal fitting for hanging the jig body, and the jig body around the cylinder axis A steel pipe erection jig that is provided integrally with the jig main body, and is also used as a rotating metal fitting for rotation.   A key slit is formed in the jig main body, which is interposed between joints of the steel pipe and the jig main body, and can be fitted with a rotation suppression key for transmitting a rotational force around the cylinder axis from the jig main body to the steel pipe. The steel pipe installation jig according to claim 1.   A joint and a hanging metal fitting project from the upper end, respectively, and the hanging metal fitting for the steel pipe installation jig according to claim 1 or 2 is hung on the upper end of a steel pipe installed as a pile or a sheet pile. Fit the fittings together and then use the steel pipe suspension fittings to lift and build the steel pipe together with the steel pipe installation jig, and then fit the rotation fitting to the rotation cap of the pile construction machine. Next, the steel pipe is placed in the ground while rotating the steel pipe as necessary with a rotating cap.

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