JP2019173353A - Steel pipe connecting method and steel pipe dividing method - Google Patents

Abstract

To provide a steel pipe connecting method and a steel pipe dividing method capable of reliably performing work on a load transmission key for connecting a shaft-shaped joint and a tubular joint in a retaining state while eliminating the drawbacks of the prior art.SOLUTION: A steel pipe connecting method includes: a holding step for holding a load transmission key 30 in an inward groove 15 by means of a hexagonal head bolt; a fitting step for fitting a tubular joint 10 and a shaft-shaped joint 20; a releasing step for eliminating the holding of the load transmission key 30 by the hexagonal head bolt; a position determining step for determining whether a current position of the load transmission key 30 in a circumferential direction in a key groove 36 is a predetermined position via a through hole 16; an aligning step for moving the load transmission key 30 to the predetermined position via the through hole 16 when the current position is not the predetermined position; and a fixing step for pushing and fixing the load transmission key 30 from a storage position to a straddling position by a fixing member.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a steel pipe connecting method for connecting steel pipes in the direction of the steel pipe axis and a steel pipe dividing method for dividing the steel pipes connected in the direction of the steel pipe axis.

  As an example of a steel pipe coupling mechanism that couples steel pipes in the axial direction of the steel pipe, Patent Document 1 discloses one of both connection portions B provided at both ends of columnar bodies A1 and A2 (corresponding to the steel pipe of the present invention). Is formed on the cylindrical portion 1 (corresponding to the cylindrical joint of the present invention), and the other is formed on the shaft portion 2 (corresponding to the axial joint of the present invention) that can be fitted into the cylindrical portion 1. In addition, an inward groove portion 6 is formed on the cylindrical inner peripheral surface 4 of the cylindrical portion 1, and an outward groove portion 12 is fitted to the axial outer peripheral surface 10 of the axial portion 2 of the cylindrical portion 1. Tubes of adjacent columnar bodies A1 and A2 that are formed so as to face the inward groove portion 6 of the surface 4 and are fitted in a state straddling the inward groove portion 6 and the outward groove portion 12 that face each other, and are fitted to each other. Arc key 18 (corresponding to the load transmission key of the present invention) that connects part 1 and shaft part 2 in a retaining state ) Connection mechanisms S provided is disclosed. Each symbol is as in Patent Document 1.

  In this connection mechanism S, the arc key 18 rotates the set bolt 17 in one direction from the stored position stored in the inward groove portion 6 to the inward groove portion 6 and the outward groove portion 12 of the fitting insertion portion 9. It is configured to be moved to the straddling position and to be moved from the straddling position to the storage position by rotating the set bolt 17 in the other direction.

JP 2000-319874 A

  By the way, the columnar bodies A1 and A2 connected by such a connection mechanism S are used for various purposes such as building support piles, steel pipe piles, steel pipe sheet piles, landslide suppression piles, earth retaining column trains, and structural columns. Although used, a large load is applied to the arc key 18 from the inward groove portion 6 and the outward groove portion 12 in the axial direction and the circumferential direction of the columnar bodies A1 and A2.

  At that time, since the inward groove 6 and the outward groove 12 have a slight clearance with respect to the arc key 18, the arc key 18 is the axis of the columnar bodies A 1 and A 2 in the inward groove 6 and the outward groove 12. It will be moved in the mental direction and circumferential direction.

  If the set bolt 17 is loosened or damaged by this movement, the arc key 18 may move inside the inward groove 6 and the outward groove 12. Once the arc key 18 moves, it becomes difficult to screw the set bolt 17 to the arc key 18 again. Then, it becomes difficult to store the arc key 18 in the inward groove portion 6 again, and there is a possibility that the cylindrical portion 1 and the shaft portion 2 cannot be detached.

  The present invention has been made in view of the above circumstances, and it is possible to reliably perform the work on the load transmission key for connecting the shaft joint and the tubular joint in a retaining state while eliminating the drawbacks of the prior art. An object of the present invention is to provide a steel pipe connecting method and a steel pipe dividing method.

  In order to achieve the above-mentioned object, the characteristic configuration of the steel pipe coupling method of the present invention is a cylindrical joint provided at one of the steel pipe end portions facing each other of the steel pipes adjacent to each other in the axial direction of the steel pipe, and the other steel pipe end. A shaft-like joint that can be fitted to the cylindrical joint, a storage position that is stored in an inward groove provided along the circumferential direction on the inner peripheral surface of the cylindrical joint, and the cylindrical shape An outward groove and an inward groove provided on the outer circumferential surface of the shaft-like joint so as to face the inward groove along the circumferential direction when the joint and the shaft-like joint are fitted to each other A steel pipe coupling method in which the steel pipes are coupled in the axial direction of the steel pipe by a steel pipe coupling mechanism having a load transmission key disposed so as to be capable of changing the position. A through hole provided in the tubular joint so as to communicate with the direction groove. A holding step of holding the load transmission key in the inward groove by a holding member inserted through the outer surface of the cylindrical joint into the hole, and a fitting step of fitting the cylindrical joint and the shaft-like joint together; The load transmitting key in the circumferential direction in the key groove constituted by the inward groove portion and the outward groove portion through the through hole and the releasing step for releasing the holding of the load transmission key by the holding member In the position determination step for determining whether or not the current position is a predetermined position, and in the position determination step, when the current position is not the predetermined position, the load transmission key is moved through the through hole. Fixing that pushes and fixes the load transmission key from the retracted position to the straddling position by a positioning step of moving to a predetermined position and a fixing member inserted into the through hole from the outer peripheral surface of the cylindrical joint It lies in having a degree, the.

  According to the steel pipe coupling mechanism as described above, the fixing member for fixing the load transmission key in the straddling position is not a mechanism that is screwed to the load transmission key like the set bolt of the prior art, for example, the load transmission key. Since a mechanism that presses the lens can be employed, the drawbacks associated with loosening and breakage of the set bolts of the prior art can be solved.

  By the way, in the steel pipe connection method using such a steel pipe connection mechanism, since the load transmission key held in the inward groove portion in the holding process is in a state in which the holding is canceled by the releasing process, the key groove Inside, it can move in the circumferential direction by, for example, vibration applied to the steel pipe.

  If the load transmission key moves to a position that is not a predetermined position in the circumferential direction in the key groove, the load transmission key may not be properly fixed by the fixing member in the fixing process, and even if it is fixed, There is a possibility that a load cannot be obtained. The predetermined position means an appropriate position in the circumferential direction in the key groove of the load transmission key.

  Therefore, a position determination step is executed after the release step, and when the current position in the circumferential direction of the load transmission key in the key groove is not a predetermined position, the load transmission key is determined from the current position by executing the alignment step. It can be moved to a position. As a result, in the fixing step, the load transmission key is appropriately fixed at a predetermined straddling position.

  In the present invention, it is preferable that in the alignment step, an alignment jig that is inserted into the key groove from the through hole when the load transmission key is not in the predetermined position is used.

  According to the above configuration, the load transmission key can be moved from the current position in the circumferential direction in the key groove to a predetermined position by the alignment jig, so that the load transmission key can be easily moved through the through hole. It is.

  In the present invention, in the alignment step, the alignment jig is in contact with the surface of the load transmission key, or the alignment jig is hooked on the surface of the load transmission key. It is preferable that the load transmission key is moved by moving the alignment jig.

  The alignment jig is a rod-shaped member having a thinness that can be inserted into the through hole, a magnet attached to the tip, a member having an adhesive or adhesive property attached to the tip, or the tip A hook-shaped member may be attached to the part, and this is inserted into the key groove from the through hole, and the tip of the steel pipe is in contact with the surface of the load transmission key. The load transmission key can be moved in the circumferential direction within the key groove by moving the load transmission key so as to shift in the direction.

  Further, the alignment jig may be a member having a thinness that can be inserted into the through hole, for example, a tip of a member such as a wire bent in a hook shape, and this is inserted into the key groove from the through hole. The load transmission key can be moved in the circumferential direction in the keyway by being inserted and inserted and moved so as to be pulled out from the through hole in a state where the tip end is hooked on the hole or corner of the load transmission key.

  In the present invention, in the positioning step, the load transmission key is placed on the surface of the load transmission key, which is provided on the surface that can be visually observed through at least the through hole. It is preferable to move it.

  In the position determination step, whether or not the current position in the circumferential direction of the load transmission key in the key groove is a predetermined position is determined through the through hole. There is a possibility that it is not easy to determine which direction is shifted and how much the distance is shifted. Therefore, by referring to the indications provided on the surface of the load transmission key, it becomes easy to understand the direction of displacement and the length of the displacement in the circumferential direction of the load transmission key. Will improve. Further, the direction of the shift and the length of the shift can be used as a reference when creating the alignment jig at the construction site.

  The indication display is a display that can be seen from the through-hole, and a scale, a number, a letter, a figure, a symbol, a mark that indicates the direction in which the load transmission key should be moved or the direction of the hole, for example, an arrow, It is a display in which at least the direction of deviation or the length of deviation is known, such as a mode in which hue, saturation, brightness, etc. change, or any combination thereof.

  In the present invention, in the fixing step, the fixing member is attached to the hole provided in the load transmission key so as to be able to face the through hole when the load transmission key is in the predetermined position. It is preferable that a reduced diameter portion having a base end provided larger than the diameter of the hole portion and a tip end smaller than the diameter of the hole portion is inserted from the tip end.

  By pushing the load transmission key from the retracted position to the straddling position by the fixing member inserted into the through hole from the outer peripheral side of the cylindrical joint, the shaft joint and the cylindrical joint are connected in a retaining state. At that time, since the reduced diameter portion comes into contact with the hole portion from the distal end to the proximal end, the load transmission key is fixed so as not to move in the key groove in the circumferential direction, radial direction and axial direction of the steel pipe. The

  In the present invention, it is preferable to further include a depth determining step of determining whether or not a current depth through which the fixing member is inserted into the through hole is a predetermined depth.

  Since the thickness of the load transmission key, the depth of the key groove, the length of the fixing member and the length of the through hole are constant, when the load transmission key is properly fixed to the key groove, The inserted depth of the fixing member should be constant. By determining whether or not the current depth inserted into the through hole of the fixing member is a predetermined depth by the determining step, it is confirmed that the fixing member appropriately fixes the load transmission key. It can be easily done from the outside of the steel pipe.

  In order to achieve the above-mentioned object, the characteristic configuration of the steel pipe dividing method according to the present invention includes: a tubular joint provided at one of steel pipe end portions facing each other of steel pipes adjacent to each other in the axial direction of the steel pipe; A shaft-like joint that can be fitted to the cylindrical joint, a storage position that is stored in an inward groove provided along the circumferential direction on the inner peripheral surface of the cylindrical joint, and the cylindrical shape An outward groove and an inward groove provided on the outer circumferential surface of the shaft-like joint so as to face the inward groove along the circumferential direction when the joint and the shaft-like joint are fitted to each other A steel pipe splitting method for splitting the steel pipes connected in the axial direction of the steel pipe by a steel pipe connecting mechanism having a straddling position straddling and a load transmission key arranged so that the position can be changed. The cylindrical joint is provided to communicate with the inward groove. The fixing member fixing the load transmission key to the straddling position is removed from the through hole by being inserted into the formed through hole from the outer peripheral surface of the cylindrical joint, and the load transmission key is released from being fixed. Whether or not the current position of the load transmission key in the circumferential direction in the key groove formed by the inward groove portion and the outward groove portion is a predetermined position through the through hole. A position determining step for determining; a position adjusting step for moving the load transmission key to the predetermined position via the through hole when the current position is not the predetermined position in the position determining step; A holding step in which the load transmission key is pulled back from the straddling position to the storage position by a holding member inserted into the hole from the outer peripheral surface of the cylindrical joint; In that it has a drawing step, the pulling out.

  Since the load transmission key fixed in the keyway in the fixing process is released in the fixing release process, the load transmission key moves in the circumferential direction by, for example, vibration applied to the steel pipe in the keyway. obtain.

  If the load transmission key moves to a position that is not a predetermined position in the circumferential direction in the key groove, the load transmission key may not be properly held by the holding member in the holding process.

  Therefore, the position determination step is executed after the fixing release step, and when the current position in the circumferential direction of the load transmission key in the key groove is not a predetermined position, the load transmission key is moved from the current position by executing the alignment step. It can be moved to a predetermined position. As a result, the load transmission key is appropriately held in the holding step.

Explanatory drawing which cuts and shows the steel pipe pile connected by the steel pipe connection mechanism partially Explanatory drawing of holding process and fitting process Explanatory drawing of the load transmission key held by the holding member Explanatory drawing of the load transmission key held by the holding member Illustration of liberation process Explanatory drawing of position discrimination process Explanatory drawing of the instruction display provided on the load transmission key Illustration of the alignment process Illustration of the alignment process Side sectional view of the fixing process Side sectional view of the fixing process Illustration of the fixing member Explanatory drawing concerning prevention of dropout of fixing member Explanatory drawing concerning prevention of dropout of fixing member Explanatory drawing concerning prevention of dropout of fixing member Explanatory drawing of the fixing member by another embodiment Explanatory drawing of the fixing member by another embodiment Explanatory drawing of the holding member by another embodiment Explanatory drawing of the holding member by another embodiment

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows steel pipe piles P (P1, P2) used in a medium excavation method in which a rotary press-fitting into the ground is performed while excavating with an auger.

  The steel pipe pile P (P1, P2) has a cylindrical joint 10 welded to one end of a steel pipe S (S1, S2) such as a spiral steel pipe, and a shaft joint 20 welded to the other end. Cylinder.

  The steel pipe ends of the steel pipes S (S1, S2) facing each other in the steel pipe piles P (P1, P2) adjacent to each other in the direction X of the steel pipe axis are connected to each other by the steel pipe connecting mechanism J in a non-detaching state and in a non-rotating state. It is configured to be possible.

  The steel pipe coupling mechanism J includes a tubular joint 10, a shaft joint 20, a load transmission key 30, and a rotation suppression key 40.

  The tubular joint 10 is created by processing a steel tubular body. As shown in FIG. 2, the cylindrical joint 10 is provided with a ridge 11 on the lower end side and a plurality of cylindrical cutout recesses 12 spaced apart in the circumferential direction. A circumferential groove 14 is provided on the upper end side of the inner peripheral surface 13 of the tubular joint 10.

  Two inward groove portions 15 are provided on the inner peripheral surface 13 along the circumferential direction. Each inward groove 15 is configured deeper than the thickness of a load transmission key 30 described later. As a result, as shown in FIGS. 3 and 4, the load transmission key 30 can be stored in the storage position where the load transmitting key 30 enters the inner groove 13 inside the inner peripheral surface 13.

  The shaft-like joint 20 is created by processing a steel tubular body. As shown in FIG. 2, the upper end side of the shaft-like joint 20 is provided with a protrusion 21 that can be fitted in the circumferential groove 14 provided in the tubular joint 10.

  When the cylindrical joint 10 and the shaft-shaped joint 20 are fitted to each other, the shaft-side notch recess 22 is provided at a position facing the cylinder-side notch recess 12 provided in the cylindrical joint 10. Yes. The tube-side cutout recess 12 and the shaft-side cutout recess 22 constitute a key groove 42 of a rotation suppression key 40 described later. A female screw 26 to which a fixing screw 41 for fixing the rotation suppression key 40 to the key groove 42 can be screwed is provided at the central portion of the shaft-side notch recess 22 (see FIG. 1).

  The outer peripheral surface 23 has a length in the steel pipe axis X direction that is substantially the same as the length of the inner peripheral surface 13 of the cylindrical joint 10 in the steel pipe axis X direction, and has an outer diameter that can be fitted to the inner peripheral surface 13. It is configured.

  On the lower end side of the outer peripheral surface 23, a circumferential groove 24 into which the protrusion 11 provided in the tubular joint 10 can be fitted is formed.

  Two outwardly extending grooves 25 are formed on the outer peripheral surface 23 along the circumferential direction so as to face the inwardly extending grooves 15 when the tubular joint 10 and the shaft-shaped joint 20 are fitted to each other. Is provided. The inward groove portion 15 and the outward groove portion 25 constitute a key groove 36 according to the present invention.

  The load transmission key 30 is a member for connecting the tubular joint 10 and the shaft joint 20 in a retaining state when the tubular joint 10 and the shaft joint 20 are fitted to each other. In the present embodiment, six pieces are provided around the steel tube axis X.

  The load transmission key 30 is an arcuate steel member having a rectangular cross section and an inner circumferential surface of the key facing the bottom surface of the outward groove 25 having substantially the same curvature as the bottom surface (see FIG. 4).

  As shown in FIG. 7, the load transmission key 30 is provided with an instruction display 31 on the surface of the load transmission key 30 that can be viewed through at least the through-hole 16 when in the key groove 36.

  The indication display 31 is a display that can be seen from the through-hole 16, and is a scale, a number, a character, a figure, a symbol, a mark that indicates the direction in which the load transmission key 30 should be moved or the direction of the hole, for example, an arrow , Hue, saturation, brightness, etc., and any combination of these, such as a display showing at least the direction of the shift or the length of the shift. In this embodiment, the direction of the hole 32 An arrow pointing to is adopted.

  By the fixing member 51 described later, the load transmission key 30 is pushed from the storage position stored in the inward groove portion 15 to the straddling position straddling the inward groove portion 15 and the outward groove portion 25 facing each other, The cylindrical joint 10 and the shaft-shaped joint 20 are connected in a retaining state. Further, the load transmission key 30 is pulled back from the straddling position to the retracted position by a hexagon bolt 50 described later, thereby releasing the connection between the tubular joint 10 and the shaft joint 20.

  The groove depth of the outward groove portion 25 is configured to be approximately half the thickness along the radial direction of the steel pipe pile P (P1, P2) of the load transmission key 30, and when the load transmission key 30 is in the straddling position In addition, the load transmission key 30 is disposed so as to straddle the inward groove portion 15 and the outward groove portion 25 substantially evenly.

  As shown in FIG. 3, through-holes 16 having a circular cross section communicating with the inside of the inward groove portion 15 from the outer peripheral surface of the cylindrical joint 10 are equally spaced in the circumferential direction corresponding to each load transmission key 30. It is provided at six locations. A female screw 18 (see FIG. 3) capable of screwing a male screw 52 (see FIG. 12) provided in the fixing member 51 described later is provided on the inner peripheral surface of the through hole 16.

  As shown in FIG. 8, a hole 32 that penetrates in the thickness direction is formed at the center position in the longitudinal direction and the height direction of the load transmission key 30. A counterbore 33 and an internal thread 34 are provided in the hole 32.

  As shown in FIG. 3, the hexagon bolt 50 loosely inserted into the through hole 16 when the load transmission key 30 is disposed in the inward groove portion 15 so that the hole portion 32 faces the through hole 16. Is screwed into the female screw 34 of the load transmission key 30 to hold the load transmission key 30 in the retracted position. The hexagon bolt 50 in this embodiment is a holding member according to the present invention.

  In addition, the load transmission key 30 can be pulled back to the retracted position by screwing the hexagon bolt 50 loosely inserted through the through hole 16 into the female screw 34 of the load transmission key 30 located at the straddling position. .

  As shown in FIG. 12, the fixing member 51 that can be attached to the through hole 16 is provided with a male screw 52 that can be screwed into the female screw 18 of the through hole 16 around the cylindrical body portion. A conical portion 53 is provided on one end side of the body portion, and a hole portion 54 into which a tool such as a hexagon wrench for screwing the fixing member 51 screwed into the through hole 16 can be fitted is provided on the other end side. It has been. Note that the length of the fixing member 51 is configured so as not to protrude from the outer peripheral surface of the cylindrical joint 10 when the load transmission key 30 is pushed into the straddling position.

  The conical portion 53 is configured such that a base end connected to one end side of the body portion is larger than a diameter of the hole portion 32, a distal end is smaller than a diameter of the hole portion 32, and the distal end is inserted into the female screw 34. Does not contact the female screw 34, but contacts the boundary peripheral edge 35 between the surface of the load transmission key 30 and the inner peripheral surface of the spot facing 33. For this reason, even if a large load in the steel tube axis X direction or the circumferential direction acts on the load transmission key 30 from the inward groove portion 15 and the outward groove portion 25, the female screw 34 is not damaged, and the hexagon bolt 50 Screwing remains possible. Therefore, the connection of the steel pipe pile P (P1, P2) cannot be released.

  The conical portion 53 in the present embodiment is a reduced diameter portion according to the present invention, and can be inserted into the hole 32 of the load transmission key 30 and screwed into the female screw 34 when the fixing member 51 is screwed into the through hole 16. The load transmission key 30 is locked to move in the circumferential direction, radial direction, and axial direction of the steel pipe.

  As shown in FIG. 5, after fitting the tubular joint 10 and the shaft joint 20, the hexagon bolt 50 is removed from the load transmission key 30, and the fixing member 51 is penetrated as shown in FIGS. 10 to 12. When the screw is shallowly engaged with the female screw 18 of the hole 16, a tool is fitted into the hole portion 54, and the fixing member 51 is screwed, the conical portion 53 comes into contact with the boundary peripheral edge portion 35, and the load transmission key 30 is in the retracted position. Is pushed into the straddling position. At this time, the load transmission key 30 is fixed at the straddling position and is locked to move in the circumferential direction.

  Note that a circumferential groove 17 is formed in the through hole 16 at a location close to the outer peripheral surface of the tubular joint 10. A snap ring 19 for a hole can be attached to the circumferential groove 17. As shown in FIGS. 13 to 15, even if the fixing member 51 is rotated by the snap ring 19 attached to the circumferential groove 17 due to vibration or the like during the embedding operation of the steel pipe pile P (P1, P2), the fixing member 51 Is prevented from falling out of the through hole 16 and the load transmission key 30 is maintained at the straddling position, so that there is no possibility that the connection between the tubular joint 10 and the shaft joint 20 is released.

  The rotation suppression key 40 will be described. As shown in FIG. 1, the rotation suppression key 40 is a member for connecting the cylindrical joint 10 and the shaft-shaped joint 20 in a non-rotating state, and the cylinder-side notch recess 12 and the shaft-side notch recess 22 that face each other. It is comprised in the shape corresponding to the keyway 42 comprised by these.

  When the cylindrical joint 10 and the shaft-shaped joint 20 are in a state of being fitted to each other, the rotation suppression key 40 is straddled across the cylinder-side notch recess 12 and the shaft-side notch recess 22 (see FIG. 2). By doing so, the relative rotation of the steel pipe piles P (P1, P2) connected to each other is prevented. The rotation suppression key 40 is fixed to the shaft joint 20 by a fixing screw 41.

  The steel pipe connecting mechanism J configured as described above will be described with respect to the steel pipe connecting method and the steel pipe dividing method according to the present invention. The following description demonstrates the case where the cylindrical joint 10 of the steel pipe pile P1 is connected with respect to the axial joint 20 of the steel pipe pile P2 embedded previously, and the case where it divides | segments.

  As shown in FIG. 2, in connecting the steel pipe pile P1 and the steel pipe pile P2, each load transmission key 30 is provided in the cylindrical joint 10 of the steel pipe pile P1 by the hexagon bolt 50 inserted through each through hole 16. It holds in the inward groove part 15 (holding process). The steel pipe pile P1 is lifted with a crane with the tubular joint 10 facing downward, and moved onto the shaft joint 20 of the steel pipe pile P2. Before and after this, the rotation suppression key 40 is attached to the shaft-side cutout recess 22 provided in the shaft-shaped joint 20 of the steel pipe pile P2 by the fixing screw 41.

  Next, the steel pipe pile P1 is lowered and the tubular joint 10 and the shaft-shaped joint 20 are fitted (fitting process). When the steel pipe pile P1 is lowered, the steel pipe pile P1 is appropriately rotated so that the rotation-suppressing key 40 attached to the shaft-side cutout recess 22 is fitted into the cylinder-side cutout recess 12.

  And as shown in FIG. 5, the hexagon bolt 50 is removed from the cylindrical joint 10, and holding | maintenance of the load transmission key 30 by the hexagon bolt 50 is canceled (release process).

  As shown in FIG. 6, whether or not the current position of the load transmitting key 30 in the circumferential direction in the key groove formed by the inward groove portion 15 and the outward groove portion 25 is a predetermined position via the through hole 16. Is determined (position determination step).

  In the position determination step, when the current position of the load transmission key 30 is not a predetermined position, that is, when the load transmission key 30 is visually observed from the through hole 16, the axis of the hole 32 is shifted from the axis of the through hole 16. Sometimes, the load transmission key 30 is moved to a predetermined position via the through hole 16 (positioning step).

  As shown in FIG. 8, in the alignment step, an alignment jig 38 that is inserted into the key groove from the through hole 16 when the load transmission key 30 is not in a predetermined position is used.

  The alignment jig 38 has a magnet attached to a tip end portion 38a of a rod-like member having a thickness that can be inserted into the through hole 16. In the alignment step, the alignment jig 38 is inserted into the key groove 36 from the through hole 16. The load transmission key 30 is circumferentially moved in the key groove 36 by being moved so as to be shifted in the circumferential direction of the steel pipe in the through hole 16 in a state where the tip portion is in contact with the surface of the load transmission key 30. Can be moved in the direction.

  In the position determination process, when the current position of the load transmission key 30 is at the predetermined position, the process proceeds to the next fixing process without performing the alignment process.

  As shown in FIGS. 10 to 12, in the fixing process, the load transmitting key 30 is pushed and fixed from the storage position to the straddling position by the fixing member inserted through the through hole 16.

  And it is discriminate | determined whether the present depth by which the fixing member was penetrated with respect to the through-hole 16 is predetermined depth (depth discrimination | determination process). In the depth determination step, if the current depth through which the fixing member 51 is inserted is a predetermined depth, the steel pipe pile P1 and the steel pipe pile P2 are appropriately connected. If the current depth is not a predetermined depth, there is a possibility that the fixing member 51 is not properly attached or the load transmission key 30 is misaligned. As shown in FIGS. 13 to 15, the fixing member 51 is prevented from falling off the through hole 16 by attaching the snap ring 19 to the circumferential groove 17 of the through hole 16. The steel pipe pile P1 and the steel pipe pile P2 are connected by the above procedure.

  On the other hand, the division | segmentation of the steel pipe pile P1 and the steel pipe pile P2 connected as mentioned above is performed as follows. First, the snap ring 19 is removed from the through hole 16, the fixing member 51 is removed, and the load transmission key 30 is released (fixing release step). Next, similarly to the steel pipe connection method described above, the position determination step shown in FIG. 6 and the alignment step shown in FIG. 8 are executed. 3 and 4, the load transmission key 30 is pulled back from the straddling position to the retracted position by the hexagon bolt 50 inserted through the through hole 16 from the outer peripheral surface of the cylindrical joint (holding process). Finally, the steel pipe pile P1 is lifted, and the shaft-like joint 20 is pulled out from the tubular joint 10 (drawing step).

  In the above-described embodiment, the case where the alignment jig 38 has a magnet attached to the distal end portion 38a of a rod-like member having a thinness that can be inserted into the through hole 16 has been described. However, the present invention is not limited to this. . For example, the alignment jig 38 has a stick-like member attached to the tip of a rod-like member that is thin enough to be inserted into the through-hole 16, or a hook-like member attached to the tip. It may be attached. Even such an alignment jig 38 is inserted into the key groove 36 from the through hole 16, and the steel pipe is inserted into the through hole 16 in a state where its tip is in contact with the surface of the load transmission key 30. The load transmission key 30 can be moved in the circumferential direction in the keyway by moving the load transmission key 30 in the circumferential direction.

  Further, as shown in FIG. 9, the alignment jig 38 is formed by bending a tip end portion 38a of a member having a thinness that can be inserted into the through hole 16, for example, a member such as a wire, into a hook shape. The load transmission key 30 is inserted through the through hole 16 into the key groove and moved so as to be pulled out from the through hole 16 with the tip end hooked on the hole 32 or the corner of the load transmission key. Can be moved in the circumferential direction in the keyway.

  In the above-described embodiment, the case where the reduced diameter portion is the conical portion 53 has been described, but the present invention is not limited thereto. The diameter-reduced portion does not need to gradually decrease in diameter from the base end to the tip, and gradually decreases in diameter from the base end to the tip, such as a spherical notch having a spherical crown. May be smaller. In this case, the spherical crown of the ball notch portion contacts the boundary peripheral edge portion 35.

  In the above-described embodiment, the case where the hole 32 is provided with the counterbore 33 has been described, but the hole 32 may be provided with a counterbore. FIG. 16 shows an example in which the reduced diameter portion is a spherical notch 55 and the counterbore 37 is provided in the hole 32. In this case, when the tip of the spherical notch 55 is inserted into the hole 32, the spherical crown of the spherical notch 55 and the tapered surface of the counterbore 37 come into contact.

  In the above-described embodiment, the case where the diameter of the reduced diameter portion gradually decreases from the proximal end to the distal end has been described, but the present invention is not limited thereto. The reduced diameter portion may be formed of a small diameter portion whose diameter gradually decreases in the middle from the proximal end to the distal end.

  In FIG. 17, an example in which the reduced diameter portion is the small diameter portion 56 and the outer peripheral surface of the small diameter portion 56 and the inner peripheral surface of the spot facing 33 come into contact when the tip of the small diameter portion 56 is inserted into the hole 32. Show. The hole portion 32 may be provided with a counterbore 37 as shown in FIG. 16 instead of the counterbore 33. In this case, when the distal end of the small diameter portion 56 is inserted into the hole portion 32, the peripheral edge portion of the distal end of the small diameter portion 56 and the tapered surface of the counterbore 37 are in contact with each other.

  In the above-described embodiment, the case where the holding member is the hexagon bolt 50 has been described, but the holding member is not limited to the hexagon bolt 50. For example, as shown in FIG. 18, the holding member may be a so-called very low-head hexagon socket head bolt 60 that has a lower head than a normal bolt. In FIG. 18, the same components as those in FIG. 3 are denoted by the same reference numerals.

  At this time, the diameter of the head of the ultra low-head hexagon socket head cap screw 60 is larger than the inner diameter of the portion of the through hole 16 where the female screw 18 is formed, and the peripheral groove 17 of the through hole 16 is formed. The inner diameter of the portion of the through-hole 16 where the female screw 18 is formed is set smaller than the diameter of the head of the ultra-low-head hexagon socket head bolt 60 and the through-hole. 16 by setting the inner diameter of the portion in which the circumferential groove 17 is formed to be larger than the diameter of the head of the ultra-low-head hexagon socket head bolt 60, the ultra-low-head hexagon socket screwed into the load transmission key 30 The head of the attached bolt 60 comes into contact with the boundary between the portion of the through hole 16 where the female screw 18 is formed and the portion of the through hole 16 where the circumferential groove 17 is formed.

  When the load transmission key 30 is disposed in the inward groove portion 15 so that the hole portion 32 faces the through hole 16, the very low head hexagon socket head bolt 60 is loosely inserted into the through hole 16 to transmit the load. The load transmission key 30 can be held in the retracted position by being screwed into the female screw 34 of the key 30.

  At this time, the extremely low head hexagon socket head cap screw 60 has an appropriate length for the shaft portion and an appropriate height that allows the head portion to fit in the through hole 16, that is, from the surface of the cylindrical joint 10. By setting the depth of the through-hole 16 to the portion where the circumferential groove 17 is formed, the depth is set to be deeper than the height of the head, so that the head is screwed into the female screw 34 of the load transmission key 30. The portion does not protrude outward from the surface of the cylindrical joint 10.

  Further, the holding member may be a hexagon socket countersunk bolt 70 as shown in FIG. In FIG. 19, the same components as those in FIG. 3 are denoted by the same reference numerals.

  At this time, the diameter of the head of the countersunk bolt 70 with a hexagonal hole is larger than the inner diameter of the portion of the through hole 16 where the female screw 18 is formed, and the portion of the through hole 16 where the circumferential groove 17 is formed. The inner diameter of the portion of the through-hole 16 where the female screw 18 is formed is set smaller than the diameter of the head of the hexagon socket countersunk bolt 70, By setting the inner diameter of the portion where the groove 17 is formed to be larger than the diameter of the head of the hexagon socket countersunk bolt 70, the head of the hexagon socket countersunk bolt 70 screwed into the load transmission key 30 is It contacts the boundary portion between the portion of the through hole 16 where the female screw 18 is formed and the portion of the through hole 16 where the circumferential groove 17 is formed.

  When the load transmission key 30 is disposed in the inward groove portion 15 so that the hole portion 32 faces the through hole 16, the hexagon socket countersunk bolt 70 is loosely inserted into the through hole 16. The load transmission key 30 can be held in the retracted position by being screwed into the female screw 34.

  At this time, the countersunk bolt 70 with a hexagonal hole has an appropriate length at its shaft portion and an appropriate height that allows its head portion to fit in the through hole 16, that is, the surface of the cylindrical joint 10. By setting the depth from the through hole 16 to the portion where the circumferential groove 17 is formed, the load transmission key 30 is set deeper than the height of the portion of the head that is larger than the inner diameter of the female screw 18. The head does not protrude from the surface of the cylindrical joint 10 when the female screw 34 is screwed.

  In the above-described embodiment, the case where the hole portion 32 penetrating in the thickness direction at the center position in the longitudinal direction and the height direction of the load transmission key 30 is constituted by the counterbore 33 and the female screw 34 has been described. However, it is not limited to this. The hole 32 may be a recess that does not penetrate the load transmission key 30, the counterbore 33 may not be provided, and the female screw 34 may not be provided.

  In the above-described embodiment, the case where the holding member that holds the load transmission key 30 in the storage position is the hexagon bolt 50 has been described, but the present invention is not limited thereto. The holding member may be composed of a dimension bolt that is screwed to the female screw 34 of the load transmission key 30 and a nut that is threaded to the dimension bolt from the outside of the through hole 16. In this case, the load transmission key 30 is extended from the storage position from the outer peripheral surface side of the cylindrical joint by loosening or removing the nut from the other end while one end of the dimensioning bolt is screwed to the load transmission key 30. It becomes possible to push in to the position.

  Further, the steel pipe coupling mechanism J may be configured to be able to push the load transmission key 30 at the retracted position into the straddling position with an appropriate rod or the like through the through hole 16 from the outer peripheral side of the tubular joint 10.

  Further, the steel pipe coupling mechanism J may be provided with a fixing means capable of fixing the load transmission key 30 in the straddling position by a plug or the like screwed into the through hole 16 so as to be unfixable.

  Steel pipe piles P (P1, P2) connected by the steel pipe connection mechanism J include building support piles, landslide prevention piles, column piles for earth retaining such as steel pipe sheet piles, partition walls, revetment walls, structural columns, etc. Can be used for various purposes, in addition to the medium digging method, a driving method that is performed by striking, a pre-boring method that is inserted into an existing excavation hole, or a soil cement synthetic pile method that is rotated and embedded while building a soil cement Alternatively, it can be submerged using a rotary buried pile method or the like that is simply rotated and press-fitted (embedded). When the steel pipe is driven by a method that does not involve rotation, the steel pipe coupling mechanism may not include the rotation suppression key 40.

  The steel pipe coupling mechanism J may be provided with a cylindrical joint 10 or a shaft-like joint 20 at the end of a pipe such as a UO pipe, a bending pipe, or a cast steel pipe cast by a centrifugal casting method.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited. is there.

DESCRIPTION OF SYMBOLS 10: Tubular joint 13: Inner peripheral surface 15: Inward groove part 16: Through-hole 18: Female screw 20: Shaft joint 23: Outer peripheral surface 25: Outward groove part 30: Load transmission key 31: Instruction display 32: Hole 36: Key groove 38: Positioning jig 38a: Tip portion 50: Hexagon bolt (holding member)
51: Fixed member 52: Male screw J: Steel pipe coupling mechanism P: Steel pipe pile S: Steel pipe X: Steel pipe axis

Claims (7)

A tubular joint provided at one of the steel pipe end portions facing each other of the steel pipes adjacent to each other in the axial direction of the steel pipe; a shaft joint provided at the other steel pipe end portion and engageable with the tubular joint; When the storage position stored in the inward groove provided along the circumferential direction on the inner peripheral surface of the tubular joint and the tubular joint and the shaft joint are fitted to each other, the shaft Load transmission arranged on the outer peripheral surface of the joint in a circumferential direction so as to face the inward groove portion and the straddling position straddling the inward groove portion so that the position can be changed A steel pipe connection method for connecting the steel pipes in the axial direction of the steel pipe by a steel pipe connection mechanism having a key,
A holding step of holding the load transmission key in the inward groove portion by a holding member inserted from a cylindrical joint outer peripheral surface into a through hole provided in the cylindrical joint so as to communicate with the inward groove portion;
A fitting step for fitting the tubular joint and the shaft-shaped joint;
A releasing step for eliminating the holding of the load transmission key by the holding member;
A position determining step for determining whether or not the current position of the load transmitting key in the circumferential direction in the key groove formed by the inward groove portion and the outward groove portion is a predetermined position via the through hole; ,
In the position determination step, when the current position is not the predetermined position, an alignment step of moving the load transmission key to the predetermined position via the through hole;
A steel pipe connecting method comprising: a fixing step of pushing and fixing the load transmission key from the storage position to the straddling position by a fixing member inserted into the through hole from the outer peripheral surface of the cylindrical joint.   The steel pipe connection method according to claim 1, wherein in the alignment step, an alignment jig that is inserted into the key groove from the through hole when the load transmission key is not in the predetermined position is used.   In the alignment step, the alignment jig is in a state where the alignment jig is in contact with the surface of the load transmission key, or in a state where the alignment jig is hooked on the surface of the load transmission key. The steel pipe connection method according to claim 2, wherein the load transmission key is moved by moving the load.   3. In the positioning step, the load transmission key is moved based on an instruction display provided on a surface of the load transmission key that can be viewed through at least the through hole. Or the steel pipe connection method of 3.   In the fixing step, a base end provided in the fixing member with respect to a hole provided in the load transmission key so as to be opposed to the through hole when the load transmission key is in the predetermined position. The steel pipe connection method according to any one of claims 1 to 4, wherein a reduced diameter portion having a diameter larger than the diameter of the hole portion and having a tip smaller than the diameter of the hole portion is inserted from the tip.   The steel pipe connection according to any one of claims 1 to 5, further comprising a depth determining step of determining whether or not a current depth through which the fixing member is inserted into the through hole is a predetermined depth. Method. A tubular joint provided at one of the steel pipe end portions facing each other of the steel pipes adjacent to each other in the axial direction of the steel pipe; a shaft joint provided at the other steel pipe end portion and engageable with the tubular joint; When the storage position stored in the inward groove provided along the circumferential direction on the inner peripheral surface of the tubular joint and the tubular joint and the shaft joint are fitted to each other, the shaft Load transmission arranged on the outer peripheral surface of the joint in a circumferential direction so as to face the inward groove portion and the straddling position straddling the inward groove portion so that the position can be changed A steel pipe dividing method for dividing the steel pipes connected in the axial direction of the steel pipe by a steel pipe connecting mechanism having a key,
A fixing member that fixes the load transmission key to the straddling position by being inserted from a cylindrical joint outer peripheral surface into a through-hole provided in the cylindrical joint so as to communicate with the inward groove portion. , A fixing release step for releasing the load transmission key from the through hole, and
A position determining step for determining whether or not the current position of the load transmitting key in the circumferential direction in the key groove formed by the inward groove portion and the outward groove portion is a predetermined position via the through hole; ,
In the position determination step, when the current position is not the predetermined position, an alignment step of moving the load transmission key to the predetermined position via the through hole;
A holding step of pulling and holding the load transmission key from the straddling position to the storage position by a holding member inserted through the through hole from the outer peripheral surface of the cylindrical joint;
A steel pipe dividing method comprising: a drawing step of drawing the shaft-like joint from the tubular joint.

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