JP6390389B2 - Steel pipe column joining equipment - Google Patents

Description

  The present invention relates to a steel pipe column joining apparatus for fastening a screw type mechanical joint when a lower steel pipe column and an upper steel pipe column inserted into a ground pit are joined by a screw type mechanical joint.

  As a method of joining the upper and lower steel pipe columns during the construction of the concrete-filled steel pipe column (CFT column), a method of joining with a screw-type mechanical joint is known (for example, see Patent Document 1). In the joining method described in Patent Literature 1, a threaded body wound around an upper steel pipe column is pulled by a traction device, whereby the upper steel pipe column is rotated to fasten a screw-type mechanical joint.

JP 2013-174088 A

  By the way, when carrying out the back-strike method under low-heading construction conditions, by constructing a strut-back strut with a length that reaches the pile from the ground by sequentially connecting columns shortened according to the head-to-head limit . Here, when the steel pipe column described in Patent Document 1 is adopted as the column to be constructed in the ground such as the back-strung strut, the screws of the upper and lower steel pipe columns are secured in order to ensure sufficient bonding strength between the upper and lower steel pipe columns. Type mechanical joints must be fastened with high torque. Therefore, it is conceivable to use a device that fastens the upper and lower steel pipe columns with screw-type mechanical joints at a high torque, but when the upper steel tube column is inserted into the device from above, the length of the steel pipe column is Must be less than the height up to the existing existing structure. Thereby, a steel pipe pillar becomes short and the frequency | count of the connection operation | work of a steel pipe pillar increases.

  The present invention has been made in view of the above circumstances, and it is possible to join the lower steel pipe column inserted into the ground pit and the upper steel pipe column with sufficient joint strength by a screw-type mechanical joint. It is an object of the present invention to provide a steel pipe column joining apparatus that is suitable for use under low head conditions.

  In order to solve the above-mentioned problems, the steel pipe column joining apparatus according to the present invention, when joining the lower steel pipe column inserted into the ground pit and the upper steel pipe column with a screw-type mechanical joint, A steel pipe column joining device for fastening the screw-type mechanical joint, a holding unit for holding the lower steel pipe column in a detent state, and a fastening unit for holding and rotating the upper steel pipe column; The fastening portion is disposed on the holding portion and is arranged on the upper pedestal frame so as to be rotatable around an axis of the upper steel pipe column and the upper pedestal frame through which the upper steel pipe column is passed. An upper holding frame that is provided and surrounds and holds the upper steel pipe column; and an upper holding frame that transitions from the holding state to a developed state that allows the upper steel pipe column to enter and retract; and It is provided in the base frame of the And a telescopic mechanism for rotating the upper holding frame.

  In the steel pipe column joining apparatus, the holding portion is provided on a lower pedestal frame that is arranged under the upper pedestal frame and through which the lower steel pipe column is passed, and the lower pedestal frame, A holding state that surrounds and holds the lower steel pipe column, and a lower holding frame that expands from the holding state and transitions to an expanded state that allows the lower steel pipe column to enter and retract. Also good. The upper pedestal frame may include a passage through which the upper steel pipe column entering and retracting the upper holding frame in the deployed state enters and retracts, and the lower pedestal frame is in the deployed state. You may provide the channel | path in which the said lower steel pipe pillar which enters / exits to the said lower holding | maintenance frame enters / exits.

  In the steel pipe column joining apparatus, the upper pedestal frame and the lower pedestal frame may be annular, partly configured to be detachable, and partly removed to form the passage. .

  The steel pipe column joining device may include a height adjusting mechanism for adjusting a height of at least one of the upper pedestal frame and the lower pedestal frame.

  According to the present invention, the lower steel pipe column inserted into the ground pit and the upper steel pipe column can be joined with sufficient joint strength by the screw-type mechanical joint, and under the low head condition. A steel pipe column joining apparatus suitable for use can be provided.

It is an elevation (partial sectional view) showing a concrete-filled steel pipe column in which steel pipe columns are joined using the joining device according to an embodiment. It is an elevation view which shows the joining apparatus used in order to join a steel pipe column. It is a plane sectional view (3-3 sectional view of Drawing 2) showing a joining device used for joining a steel pipe pillar. It is a plane sectional view (4-4 sectional view of Drawing 2) showing a joining device used for joining a steel pipe pillar. It is a top view which shows the procedure which joins a steel pipe column. It is an elevation view which shows the procedure which joins a steel pipe column. It is a top view which shows the procedure which joins a steel pipe column. It is a top view which shows the procedure which joins a steel pipe column. It is a top view which shows the procedure which joins a steel pipe column. It is an elevation view which shows the procedure which joins a steel pipe column. It is a top view which shows the procedure which joins a steel pipe column. It is a top view which shows the procedure which joins a steel pipe column. It is a top view which shows the procedure which joins a steel pipe column. It is an elevation view which shows the procedure which joins a steel pipe column. It is a plane sectional view showing the joining device of the steel pipe pillar concerning other embodiments. It is an elevational sectional view showing an enlarged holding mechanism. It is an elevation view which shows the joining apparatus of the steel pipe pillar which concerns on other embodiment. It is a plane sectional view showing the joining device of the steel pipe pillar concerning other embodiments.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevational view (partial cross-sectional view) showing a concrete-filled steel pipe column (CFT column) 2 in which a steel pipe column 1 is joined using a joining device 10 (see FIG. 2 and subsequent figures) according to an embodiment. As shown in this figure, the CFT column 2 is a reverse strut built in a pit 7 and has a length that reaches a pile 3 by joining a plurality of steel pipe columns 1. The cross-sectional shape of the pit 7 may be circular or rectangular.

  Here, an internal thread portion 4 having a thread groove formed on the inner peripheral surface is formed at the upper end of each steel pipe column 1, and an external thread portion 5 having a thread groove formed on the outer peripheral surface at the lower end of each steel tube column 1. Are formed, and the upper and lower steel pipe columns 1 are joined together by fastening the female threaded portion 4 of the lower steel pipe column 1 and the male threaded portion 5 of the upper steel pipe column 1.

  Further, a die plate 6 is provided at the joint portion of the CFT pillar 2. The diaphragm 6 is a through diaphragm or an outer diaphragm, for example, a disk-shaped or annular steel material, and projects horizontally from the outer peripheral surface of the steel pipe column 1.

  FIG. 2 is an elevation view showing a joining device 10 used for joining the steel pipe columns 1, and FIG. 3 is a plan sectional view (3-3 sectional view of FIG. 2) showing the joining device 10. . 4 is a plan sectional view (a sectional view taken along the line 4-4 in FIG. 2) showing the bonding apparatus 10. FIG. As shown in these drawings, the joining device 10 includes a holding device 20 that holds the lower steel pipe column 1 inserted into the pit 7, and a female screw portion 4 and a male screw portion 5 by rotating the upper steel pipe column 1. And a fastening device 40 for fastening the two.

  The holding device 20 includes a rectangular pedestal frame 22, a plurality of (four in this embodiment) level adjustment mechanisms 24 arranged under the pedestal frame 22, and a holding mechanism 30 installed on the pedestal frame 22. It has. The pedestal frame 22 is formed in a rectangular shape by welding H-shaped steels 22A, 22B, 22C, and 22D. The level adjusting mechanism 24 is a hydraulic jack, and is disposed under the corner of the pedestal frame 22. The plurality of level adjusting mechanisms 24 adjust the height and posture of the base frame 22.

  Here, the H-shaped steel 22A constituting one side of the pedestal frame 22 is configured such that a center portion 22A-1 in the material axis direction and an end portion 22A-2 in the material axis direction can be divided. That is, the flange 22F is provided at both ends of the center portion 22A-1 and one end of the end portion 22A-2, and the flange 22F on the center portion 22A-1 side and the flange 22F on the end portion 22A-2 side are provided. Connected with bolts.

  The length of the central portion 22A-1 is set larger than the diameter of the steel pipe column 1 (not the diameter of the die plate 6 but the diameter of the column portion). The length of the central portion 22A-1 may be set larger than the diameter of the diaphragm 6.

  A pair of H-shaped steels 22B and 22D coupled to both ends of the H-shaped steel 22A are fixed to the ground by fixing pins 25. The fixing pin 25 is inserted into a hole formed in the lower flange of the H-shaped steels 22B and 22D and a hole formed in the ground, thereby preventing the base frame 22 from rotating.

  A base plate 26 for attaching the holding mechanism 30 is provided on the inner peripheral side of the base frame 22. This base plate 26 is welded to the upper flanges of the H-shaped steels 22B, 22C, and 22D. Further, the base plate 26 is formed with an arc-shaped notch having a radius of curvature larger than the radius of the die plate 6 to prevent interference between the die plate 6 and the base plate 26 when the steel pipe column 1 is lowered. ing.

  The holding mechanism 30 includes an arc-shaped fixed frame 32 fixed on the base plate 26, a pair of arc-shaped movable frames 34 connected to the fixed frame 32, and a clamping device attached to the pair of movable frames 34. 36, and a fixed frame 32 and a spacer 38 fitted between the movable frame 34 and the steel pipe column 1. The fixed frame 32 is a grooved steel curved in an arc shape. The radius of curvature of the fixed frame 32 is the same as the radius of curvature of the arc-shaped notch of the base plate 26, and the web of the fixed frame 32 and the edge of the arc-shaped notch of the base plate 26 overlap on the same line. Has been.

  The movable frame 34 is attached to one end in the circumferential direction of the fixed frame 32 so as to be rotatable about a vertical axis. The movable frame 34 includes a first movable part 34A and a second movable part 34B. The first movable portion 34A and the second movable portion 34B are grooved steel curved in an arc shape. One end in the circumferential direction of the first movable portion 34A is supported by the one end in the circumferential direction of the fixed frame 32 via the rotation shaft 34C so as to be rotatable around the vertical axis, and one end in the circumferential direction of the second movable portion 34B is The other end of the first movable portion 34A in the circumferential direction is supported via the rotation shaft 34D so as to be rotatable around the vertical axis.

  The pair of movable frames 34 are arranged symmetrically with respect to the center of curvature of the fixed frame 32. When the pair of movable frames 34 are in a closed state shown by a solid line in FIG. A circular frame is constituted by 32 and the pair of movable frames 34. On the other hand, the pair of movable frames 34 interfere with a level adjusting mechanism 44 described later by folding the first movable portion 34A and the second movable portion 34B in the unfolded state shown by the broken line in FIG. Instead, it is housed between the upper and lower pedestal frames 22, 42. Here, the distance between the pair of movable frames 34 in the expanded state is larger than the diameter of the steel pipe column 1 and further larger than the diameter of the die plate 6.

  The tightening device 36 is a hydraulic cylinder and is provided so as to connect the tips of the pair of movable frames 34. A pin 36A is detachably provided at the tip of the second movable portion 34B. The pin 36A is inserted through a hole formed in the upper and lower flanges of the second movable portion 34B, and one end in the axial direction of the tightening device 36 is rotatably attached to the pin 36A.

  In a state where the movable frame 34 is closed as indicated by a solid line in FIG. 3, when the fastening device 36 contracts, the pair of movable frames 34 approach each other. On the other hand, when the pin 36A is removed from the second movable portion 34B, the movable frame 34 can be set in the unfolded state as indicated by a broken line in FIG.

  The spacer 38 is a ring-shaped member such as rubber, and is fitted between the fixed frame 32 and the movable frame 34 and the column portion of the steel pipe column 1. The spacer 38 is divided into a plurality (three in this embodiment). Here, when the tightening device 36 is extended, a clearance is formed between the spacer 38 and the movable frame 34. The spacer 38 is divided into a plurality. Thus, when the tightening device 36 is extended, the spacer 38 can be easily removed. In addition, the spacer 38 is not restricted to rubber | gum, The thing etc. which added the anti-slip | skid rubber to the steel material processed goods or the steel material processed goods may be sufficient.

  In a state where the movable frame 34 is closed as shown by a solid line in FIG. 3, when the tightening device 36 contracts, the pair of movable frames 34 come close to each other, and the steel pipe column 1 is moved to the spacer 38 by the fixed frame 32 and the movable frame 34. Tightened through.

  As shown in FIGS. 2 and 4, the fastening device 40 includes a rectangular pedestal frame 42, a plurality of (four in this embodiment) level adjusting mechanisms 44 arranged under the pedestal frame 42, and a pedestal frame. The holding mechanism 50 installed on 42 and the expansion-contraction mechanism 60 are provided. The pedestal frame 42 is formed in a rectangular shape by welding H-shaped steels 42A, 42B, 42C, and 42D. The level adjustment mechanism 44 includes a hydraulic jack 44A and upper and lower column members 44B, and connects the corner of the pedestal frame 42 and the corner of the pedestal frame 22. The plurality of level adjusting mechanisms 44 adjust the height and posture of the pedestal frame 42.

  Here, the H-shaped steel 42A constituting one side of the pedestal frame 42 is arranged right above the H-shaped steel 22A of the pedestal frame 22, and a central portion 42A-1 in the material axis direction and an end portion 42A- in the material axis direction. 2 can be divided. That is, flanges 42F are provided at both ends of the central portion 42A-1 and one end of the end portion 42A-2, and the flange 42F on the central portion 42A-1 side and the flange 42F on the end portion 42A-2 side are provided. Connected with bolts.

  The length of the central portion 42A-1 is set to be larger than the diameter of the steel pipe column 1 (not the diameter of the die plate 6 but the diameter of the column portion). Note that the length of the central portion 42A-1 may be set larger than the diameter of the diaphragm 6.

  A base plate 46 for attaching the holding mechanism 50 is provided on the inner peripheral side of the base frame 42. This base plate 46 is welded to the upper flange of the H-shaped steels 42B, 42C, 42D. Further, the base plate 46 is formed with an arc-shaped notch having a radius of curvature larger than the radius of the die plate 6, and interference between the die plate 6 and the base plate 26 when the steel pipe column 1 is lowered is prevented. ing. Here, a guide wall (not shown) is formed on the base plate 46 along an arc-shaped cutout.

  The holding mechanism 50 is attached to the arcuate rotation mechanism 52 rotatably provided on the base plate 26, a pair of arcuate movable frames 54 connected to the rotation mechanism 52, and the pair of movable frames 54. A tightening device 56 and a spacer 58 fitted between the rotating mechanism 52 and the movable frame 54 and the steel pipe column 1 are provided. The rotation mechanism 52 is a groove steel curved in an arc shape. The radius of curvature of the rotating mechanism 52 is the same as the radius of curvature of the arcuate guide wall of the base plate 46, and the web of the rotating mechanism 52 and the guide wall are in contact with each other.

  The movable frame 54 is attached to one end in the circumferential direction of the rotation mechanism 52 so as to be rotatable about the vertical axis. The movable frame 54 is channel steel curved in an arc shape. One end in the circumferential direction of the movable frame 54 is supported by the one end in the circumferential direction of the rotating mechanism 52 via the rotating shaft 54C so as to be rotatable around the vertical axis.

  The pair of movable frames 54 are arranged symmetrically with respect to the center of curvature of the rotation mechanism 52. When the pair of movable frames 54 are in a closed state shown by a solid line in FIG. 52 and the pair of movable frames 54 constitute a circular frame. On the other hand, as shown by a broken line in FIG. 3, the distance between the pair of movable frames 54 in the expanded state is larger than the diameter of the steel pipe column 1 and further larger than the diameter of the die plate 6.

  The tightening device 56 is a hydraulic cylinder and is provided so as to connect the tips of the pair of movable frames 54. A pin 56A is detachably provided at the tip of the movable frame 54. The pin 56A is inserted through a hole formed in the upper and lower flanges of the movable frame 54, and one end in the axial direction of the fastening device 56 is rotatably attached to the pin 56A.

  In a state where the movable frame 54 is closed as indicated by a solid line in FIG. 4, when the fastening device 56 contracts, the pair of movable frames 54 approach each other. On the other hand, when the pin 56A is removed from the movable frame 54, the movable frame 54 can be brought into the unfolded state as indicated by a broken line in FIG.

  The spacer 58 is an annular member such as rubber, and is fitted between the rotating mechanism 52 and the movable frame 54 and the column portion of the steel pipe column 1. The spacer 58 is divided into a plurality (three in this embodiment). Here, when the tightening device 56 is extended, a clearance is formed between the spacer 58 and the movable frame 54. The spacer 58 is divided into a plurality of parts. Thus, when the tightening device 56 is extended, the spacer 58 can be easily removed. The spacer 58 is not limited to rubber, and may be a steel product or a steel product with a non-slip rubber added thereto.

  In a state where the movable frame 54 is closed as shown by a solid line in FIG. 4, when the fastening device 56 contracts, the pair of movable frames 54 come close to each other, and the column portion of the steel pipe column 1 includes the rotation mechanism 52 and the movable frame 54. By means of the spacer 58.

  The telescopic mechanism 60 is a hydraulic cylinder and is disposed on the H-shaped steel 42C. A pair of upper and lower flanges 62 and a pin 64 fixed at both ends to the pair of upper and lower flanges 62 are provided on the outer peripheral surface of the web of the rotation mechanism 52. A pin 66 and A frame 68 that vertically supports the pin 66 is provided.

  The expansion / contraction mechanism 60 and the fastening device 56 are arranged with the steel pipe column 1 interposed therebetween. When the expansion / contraction mechanism 60 is extended, the rotation mechanism 52 and the movable frame 54 are rotated in the counterclockwise direction in the drawing, and the expansion / contraction mechanism 60 is When contracted, the rotation mechanism 52 and the movable frame 54 rotate in the clockwise direction in the figure.

  5 to 14 are elevational views or plan views showing a procedure for joining the steel pipe columns 1. First, as shown in the plan view of FIG. 5 and the elevation view of FIG. 6, the upper steel pipe column 1 lifted by the crane 8 is moved over the lower steel pipe column 1. At this time, the upper holding mechanism 50 is set in the unfolded state, and the upper steel pipe column 1 is moved horizontally between the pair of movable frames 54 and above the lower steel pipe column 1. The lower steel pipe column 1 is held by the lower holding mechanism 30.

  Next, the upper steel pipe column 1 is rotated manually or using a machine, and the male screw portion 5 of the upper steel pipe column 1 and the female screw portion 4 of the lower steel pipe column 1 are screwed together. Next, as shown in the plan view of FIG. 7, by rotating the upper steel pipe column 1 by the fastening device 40, the male screw portion 5 of the upper steel pipe column 1 and the female screw portion 4 of the lower steel pipe column 1 are moved. Let them conclude. In this step, first, the spacer 38 is fitted between the upper steel pipe column 1 and the holding mechanism 50, and the fastening device 56 is contracted to reduce the inner diameter of the movable frame 54, whereby the fixed frame 52 and the movable frame 54. Tightens and holds the upper steel pipe column 1 through the spacer 58. Next, by extending the telescopic mechanism 60, the rotating mechanism 52, the movable frame 54, and the upper steel pipe pillar 1 held by them are rotated counterclockwise in the figure.

  Next, as shown in the plan views of FIGS. 8 and 9 and the elevation view of FIG. 10, the entire column body 1 ′ formed by joining the plurality of steel pipe columns 1 is lowered. First, as shown in FIGS. 8 and 9, the upper and lower clamping devices 36 and 56 are extended to release the holding of the column body 1 ′ by the upper and lower holding mechanisms 30 and 50. Then, the upper and lower spacers 38, 58 are removed from between the upper and lower holding mechanisms 30, 50 and the column 1 '. Next, as shown in FIG. 10, the column body 1 ′ is lowered by the crane 8. At this time, the diameter of the circular holes of the holding mechanisms 30 and 50 is larger than the diameter of the die plate 6, so that the die plate 6 passes through the holding mechanisms 30 and 50. Then, when the head of the column body 1 ′ is lowered to the height of the holding mechanism 30, the spacer 38 is fitted between the holding mechanism 30 and the column body 1 ′, and the tightening device 36 is contracted to thereby contract the column body 1 ′. Is held by the holding device 20.

  When the length of the column 1 ′ reaches the pile 3 by repeating the above steps, the joining apparatus 10 is connected to the column 1 ′ as shown in the plan views of FIGS. 11 to 13 and the elevation view of FIG. It is removed from the built-in position, and preparations are made for placing concrete in the column 1 '. In this step, as shown in FIG. 11, the fastening device 56 is removed from the movable frame 54 to bring the movable frame 54 into a developed state, and the central portion 42A-1 of the H-shaped steel 42A is removed from the end portion 42A-2. Further, as shown in FIG. 12, the fastening device 36 is removed from the movable frame 34 to bring the movable frame 34 into a developed state, and the central portion 22A-1 of the H-shaped steel 22A is removed from the end 22A-2. Next, the forklift 9 removes the joining device 10 from the built-in position of the column 1 ′.

  As described above, the joining device 10 according to the present embodiment includes the holding device 20 that holds the lower steel pipe column 1 in a state of being prevented from rotating, and the fastening device 40 that holds and rotates the upper steel pipe column 1. Is provided. The fastening device 40 is provided on the upper pedestal frame 42 that is arranged on the holding device 20 and through which the upper steel pipe column 1 passes, and is rotatable about the axis of the upper steel pipe column 1. A holding mechanism 50 (upper holding frame) that transitions between a holding state that surrounds and holds the upper steel pipe column 1 and a deployed state that expands from the holding state and allows the upper steel pipe column 1 to enter and exit. And an extension mechanism 60 that is provided on the upper pedestal frame 42 and rotates the holding mechanism 50.

  As a result, the holding mechanism 50 is set in an unfolded state, and the upper steel pipe column 1 is adjusted so that the lower end height of the upper steel pipe column 1 is lower than the upper end of the holding mechanism 50 and higher than the upper end of the pedestal frame 42. Can be moved horizontally to the inside of the holding mechanism 50. That is, the upper steel pipe column 1 can be moved to the inside of the holding mechanism 50 without lifting up to the upper side of the holding mechanism 50.

  Therefore, the length of the steel pipe column 1 can be made more than the interval between the holding mechanism 50 and the existing structure above it, and can be increased by the height from the lower end to the upper end of the holding mechanism 50, Thereby, the frequency | count of the connection operation | work of the steel pipe pillar 1 can be reduced. As described above, the lower steel pipe column 1 inserted into the ground pit and the upper steel tube column 1 are preferably joined with sufficient mechanical strength by a screw-type mechanical joint even under low head conditions. can do.

  The holding device 20 is provided on the lower pedestal frame 22 that is disposed below the upper pedestal frame 42 and through which the lower steel pipe column 1 passes, and the lower pedestal frame 22. A holding mechanism 30 (lower holding frame) that transitions from a holding state that surrounds and holds 1 to a deployed state that expands from the holding state and allows the lower steel pipe column 1 to enter and exit is provided. Here, the upper pedestal frame 42 is provided with a passage through which the upper steel pipe pillar 1 entering and retracts into and from the upper holding mechanism 50 in the deployed state, and the lower pedestal frame 22 holds the lower side in the deployed state. A passage through which the lower steel pipe column 1 entering and exiting the mechanism 30 enters and exits is provided.

  Accordingly, the upper and lower holding mechanisms 30 and 50 are set in the unfolded state, and the entire joining apparatus 10 is moved horizontally in a direction in which the upper and lower steel pipe columns 1 are retracted from the upper and lower holding mechanisms 30 and 50, so Can be withdrawn from the upper and lower pedestal frames 22 and 42 through the passages of the upper and lower pedestal frames 22 and 42. Therefore, the joining apparatus 10 can be easily removed from the built-in position of the steel pipe column 1 with the steel pipe column 1 protruding to the ground surface.

  Here, in the joining apparatus 10, the upper and lower pedestal frames 22 and 42 are configured in a rectangular shape, and the central portions 22A-1 and 42A-1 that are part of the H-shaped steels 22A and 42A that are one side thereof are separated from both sides. It is configured to be possible. Thereby, the base frames 22 and 42 in a state where the central portions 22A-1 and 42A-1 are integrated have sufficient rigidity to withstand a reaction force when the upper and lower steel pipe columns 1 are fastened. On the other hand, the joining apparatus 10 can be easily removed from the built-in position of the steel pipe column 1 in a state where the steel pipe column 1 protrudes from the ground surface.

  Further, the joining apparatus 10 includes level adjusting mechanisms 24 and 44A including a height adjusting mechanism that adjusts the height of the upper pedestal frame 42 and the lower pedestal frame 22. Thereby, the height and posture of the steel pipe column 1 held by the holding mechanisms 30 and 50 can be adjusted by adjusting the levels of the upper and lower pedestal frames 22 and 42 by the level adjusting mechanisms 24 and 44A.

  Further, in the joining device 10, the inner diameters of the upper and lower holding mechanisms 30 and 50 are set larger than the diameter of the die plate 6 of the steel pipe column 1, and between the steel pipe column 1 and the inner peripheral surfaces of the upper and lower holding mechanisms 30 and 50. The spacers 38 and 58 are fitted in the first and second spacers. Further, when the tightening device 36 is extended, a clearance is formed between the spacer 38 and the movable frame 34, and when the tightening device 36 is extended, a clearance is formed between the spacer 38 and the movable frame 34. The spacer 38 is divided into a plurality. Thus, when the tightening device 36 is extended, the spacer 38 can be easily removed. Therefore, the upper and lower steel pipe columns 1 can be held by the upper and lower holding mechanisms 30 and 50, and when the steel pipe column 1 is lowered, the upper and lower holding mechanisms 30 and 50 are kept in the holding state (closed state). The plate 6 can pass inside the upper and lower holding mechanisms 30 and 50.

  FIG. 15 is a plan view showing a holding device 120 according to another embodiment. As shown in this figure, the holding device 120 includes a rectangular pedestal frame 122, a plurality of (four in the present embodiment) level adjustment mechanisms 24 (see FIG. 2) disposed below the pedestal frame 122, and And a holding mechanism 130 installed on the pedestal frame 122. The pedestal frame 122 is composed of a pair of parallel H-shaped steels 22A and 22C and a pair of rectangular steel materials 122B disposed in parallel therebetween.

  A pair of steel materials 122B coupled to both ends of the H-shaped steel 22A are fixed to the ground by fixing pins 25. The fixing pin 25 is inserted into a hole made in the steel material 122B and a hole made in the ground, thereby preventing the base frame 122 from rotating. Here, the pedestal frame 122 can be easily removed from the ground by using the fixing pins 25. Various fixing methods for the pedestal frame 122 can be employed. For example, an external reinforcing plate may be welded to the H-shaped steel constituting the base frame 122 and the reinforcing plate may be fixed to the ground by the fixing pins 25. Alternatively, an external piece may be welded to the steel pipe constituting the pedestal frame 122 and the piece may be fixed to the ground by the fixing pin 25. Furthermore, it may be fixed by forming a recess in the ground and fitting the pedestal frame 122 into the recess.

  The pair of holding mechanisms 130 are arranged so as to sandwich the steel pipe column 1. Each holding mechanism 130 includes a key plate 132 that is a rectangular steel material, and a hinge 134 that connects the key plate 132 to the upper surface of the steel material 122B. And a bolt 136 for fixing the key plate 132 to the steel material 122B.

  FIG. 16 is an enlarged sectional view showing the holding mechanism 130. As shown in FIGS. 15 and 16, a pair of keys 11 are provided on the outer peripheral surface of the steel pipe column 1 at the same height and symmetrically with respect to the axis of the steel pipe column 1. Is provided with a keyway 132A into which the key 11 is fitted.

  The steel material 122B and the key 11 are arranged so as not to overlap each other, and the key plate 132 has a portion where the key groove 132A is provided projecting from the steel material 122B to the steel pipe column 1 side, and the key 11 is fitted into the key groove 132A. Is arranged. Moreover, the hinge 134 has connected the end surface on the opposite side to the keyway 132A side of the key plate 132, and the upper surface of the steel material 122B. Thereby, the key plate 132 can take the fall state shown by the solid line in FIG. 16 and the rising state shown by the broken line in FIG.

  When the key plate 132 is tilted, the key 11 is fitted into the key groove 132 </ b> A, and the steel pipe column 1 is held on the base frame 122 in a state of being prevented from rotating via the key 11 and the key plate 132. On the other hand, the key plate 132 is located on the steel material 122B in the upright state.

  Here, the interval between the steel materials 122B on both sides is set larger than the diameter of the die plate 6. Thereby, in the state where key plate 132 stood up, when steel pipe pillar 1 descends, key 11 and die plate 6 can pass the height of steel material 122B.

  Although the key 11 is provided in the steel pipe column 1 and the key groove 132A is provided in the holding device 120, the key may be provided in the holding device 120 and the key groove may be provided in the steel pipe column 1. In this case, by providing the key in the holding device 120 so as to be movable in the radial direction of the steel pipe column 1, the key may be engaged with or released from the key groove of the steel pipe column 1.

  FIG. 17 is an elevation view showing the joining apparatus 100 of the steel pipe column 1 according to another embodiment, and FIG. 18 is a plan sectional view (18-18 sectional view of FIG. 17) showing the joining apparatus 100. . As shown in these drawings, the joining apparatus 100 according to the present embodiment includes an extension / contraction mechanism 160 instead of the extension / contraction mechanism 60 of the joining apparatus 10 according to the above-described embodiment.

  The telescopic mechanism 160 includes a pair of jacks 61 and a bracket 168 that rotatably supports one end side of the pair of jacks 61 via a vertical pin 66. The bracket 168 is disposed at the central portion in the material axis direction of the H-shaped steel 42C.

  The pair of jacks 61 are arranged symmetrically with respect to the axis of the steel pipe column 1, and the other end side of each jack 61 is rotatably supported by the rotating mechanism 52 via a vertical pin 64 and a bracket 62. ing. Further, the pair of jacks 61 are arranged so that the distance from the pin 66 to the pin 64 increases. As a result, as indicated by a white arrow or a solid arrow in the drawing, one jack 61 extends and the other jack 61 contracts, so that the rotating mechanism 52, the movable frame 54, and the other are held by them. The steel pipe column 1 is rotated.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in the above-described embodiment, the inner diameters of the upper and lower holding mechanisms 30 and 50 are larger than the diameter of the diaphragm 6, but this is not essential. Here, when the inner diameters of the upper and lower holding mechanisms 30 and 50 are made smaller than the diameter of the die plate 6, the upper and lower holding mechanisms 30 and 50 may be set in a deployed state when the steel pipe column 1 is lowered.

  Furthermore, in the above-described embodiment, the level adjustment mechanism 24 for adjusting the level of the lower pedestal frame 22 and the level adjustment mechanism 44A for adjusting the level of the upper pedestal frame 42 are installed, but both of them are installed. This is not essential, and at least one of them may be installed, and both of them may be non-installed.

DESCRIPTION OF SYMBOLS 1 Steel pipe pillar, 1 'pillar body, 2 CFT pillar, 3 pile, 4 internal thread part, 5 external thread part, 6 Diaplate, 7 well, 8 crane, 9 forklift, 10 joining apparatus, 11 key, 20 holding apparatus, 22 base Frame, 22A H type steel, 22B H type steel, 22C H type steel, 22D H type steel, 22F flange, 22A-1 center part, 22A-2 end part, 24 level adjustment mechanism, 25 fixing pin, 26 base plate, 30 holding mechanism , 32 fixed frame, 34 movable frame, 34A first movable part, 34B second movable part, 34C rotating shaft, 34D rotating shaft, 36 clamping device, 36A pin, 38 spacer, 40 fastening device, 42 pedestal frame, 42A H Die steel, 42B H type steel, 42C H type steel, 42D H type steel, 42F flange, 42A-1 center part, 42A-2 End, 44 level adjustment mechanism, 44A hydraulic jack, 44B pillar member, 46 base plate, 50 holding mechanism, 52 rotating mechanism, 54 movable frame, 54C rotating shaft, 56 clamping device, 56A pin, 58 spacer, 60 telescopic mechanism 61 Jack 62 Flange 64 Pin 66 Pin 68 Frame 100 Joining device 120 Holding device 122 Base frame 122B Steel material 130 Holding mechanism 132 Key plate 132A Keyway 134 Hinge 136 Bolt 160 Telescopic mechanism, 168 bracket

Claims (4)

A steel pipe column joining device for fastening the screw type mechanical joint when the lower steel pipe column inserted into the ground pit and the upper steel pipe column are joined by a screw type mechanical joint,
A holding part for holding the lower steel pipe column in a state of being prevented from rotating;
A fastening portion that holds and rotates the upper steel pipe column, and
The fastening portion is
An upper pedestal frame that is arranged on the holding portion and through which the upper steel pipe column is passed;
The upper pedestal frame is provided on the upper pedestal frame so as to be rotatable around an axis of the upper steel pipe column, and holds and surrounds the upper steel pipe column. An upper holding frame that transitions to an unfoldable deployment state;
A steel pipe column joining device comprising: an extension mechanism provided on the upper pedestal frame and rotating the upper holding frame by extending and contracting. The holding part is
A lower pedestal frame that is disposed under the upper pedestal frame and through which the lower steel pipe column is passed,
The lower pedestal frame is provided with a transition state between a holding state that surrounds and holds the lower steel pipe column, and a deployed state that expands from the holding state and allows the lower steel pipe column to enter and exit. And a lower holding frame that
The upper pedestal frame includes a passage through which the upper steel pipe column entering and leaving the upper holding frame in the deployed state enters and leaves,
2. The steel pipe column joining device according to claim 1, wherein the lower pedestal frame includes a passage through which the lower steel pipe column that enters and retracts into the lower holding frame in the deployed state enters and exits. 3.   3. The steel pipe column joint according to claim 2, wherein the upper pedestal frame and the lower pedestal frame are annular, partly configured to be detachable, and part of the pedestal frame is removed to form the passage. apparatus.   The steel pipe column joining apparatus according to any one of claims 1 to 3, further comprising a height adjusting mechanism that adjusts a height of at least one of the upper pedestal frame and the lower pedestal frame.

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