WO2022270263A1 - 機械式継手、継手付き鋼管、継手付き鋼管の製造方法、構造体、構造体の施工方法、機械式継手の設計方法 - Google Patents
機械式継手、継手付き鋼管、継手付き鋼管の製造方法、構造体、構造体の施工方法、機械式継手の設計方法 Download PDFInfo
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- WO2022270263A1 WO2022270263A1 PCT/JP2022/022435 JP2022022435W WO2022270263A1 WO 2022270263 A1 WO2022270263 A1 WO 2022270263A1 JP 2022022435 W JP2022022435 W JP 2022022435W WO 2022270263 A1 WO2022270263 A1 WO 2022270263A1
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- Prior art keywords
- joint pipe
- pipe
- split pieces
- convex portion
- outer joint
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- 238000000034 method Methods 0.000 title claims abstract description 71
- 229910000831 Steel Inorganic materials 0.000 title claims description 81
- 239000010959 steel Substances 0.000 title claims description 81
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 230000005484 gravity Effects 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims description 45
- 238000005452 bending Methods 0.000 claims description 25
- 238000013461 design Methods 0.000 claims description 6
- 238000003754 machining Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 30
- 238000005304 joining Methods 0.000 description 26
- 238000003780 insertion Methods 0.000 description 16
- 230000037431 insertion Effects 0.000 description 16
- 238000012986 modification Methods 0.000 description 14
- 230000004048 modification Effects 0.000 description 14
- 238000007373 indentation Methods 0.000 description 10
- 238000003825 pressing Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000004323 axial length Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/12—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members
- F16L37/133—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members using flexible hooks
Definitions
- the present invention provides a mechanical joint used for joining steel pipes together, a steel pipe with a joint provided with the mechanical joint, a method for manufacturing a steel pipe with a joint, a mechanical joint, and a structure provided with a plurality of steel pipes joined by the mechanical joint,
- the present invention relates to a method of constructing a structure and a method of designing a mechanical joint.
- Patent Document 1 discloses a joint that can be joined simply by inserting and has excellent workability.
- an outer joint pipe and an inner joint pipe are provided at ends of steel pipes to be joined, and the outer joint pipe and the inner joint pipe are mutually connected in the pipe axial direction. It joins steel pipes by inserting and fitting them.
- Either one of the outer joint tube and the inner joint tube has a distal end that is divided in the circumferential direction so that it can bend in the radial direction. A pushing load is applied in the axial direction, and the tip of either the outer joint pipe or the inner joint pipe is bent and inserted.
- the portion in which the tip is divided in the circumferential direction has a circular arc cross section, and therefore has higher bending rigidity than a rectangular cross section, and a large amount of bending rigidity when fitting the joints together. Requires an indentation load.
- joints generally require compressive and tensile strengths equivalent to those of steel pipes, so if the plate thickness of the joint is increased according to the specifications of the steel pipe, a larger indentation load is required. Since an increase in the pressing load required for fitting by insertion deteriorates workability, methods for reducing the pressing load are being studied.
- the present invention has been made in view of the above-mentioned problems, and its object is to reduce the pressing load required for fitting and improve workability without increasing the processing cost and reducing the strength. , a mechanical joint, a steel pipe with a joint, a method of manufacturing a steel pipe with a joint, a structure, a method of constructing the structure, and a method of designing the mechanical joint.
- a mechanical joint includes an inner joint pipe and an outer joint pipe that are provided at ends of steel pipes to be joined, and one of the inner joint pipe and the outer joint pipe is A projection formed on the outer peripheral surface of the inner joint pipe, which is divided at equal intervals in the circumferential direction and configured by split pieces that can bend in the radial direction, and a convex portion formed on the inner peripheral surface of the outer joint pipe, the inner an engaging portion that engages with the convex portion and resists a tensile load together with the convex portion in a state in which the joint pipe and the outer joint pipe are completely fitted together; is provided for engaging the split piece while the inner joint tube and the outer joint tube are being fitted together, the split piece abutting against the convex portion to cooperate with the convex portion to bend the split piece and the bent state to the engagement and a guide part that maintains the split pieces up to the joint, wherein the split pieces are grouped into a plurality of groups that satisfy the following conditions (1) and (2), and the same
- the split pieces belonging to the same group have the same axial position at which the maximum deflection occurs in the guide portion, and the axial positions are different for each group.
- the split pieces belonging to the same group Connecting the centers of directions with straight lines to form a straight line through the center of the tube or a polygon whose center of gravity coincides with the center of the tube
- a mechanical joint includes an inner joint pipe and an outer joint pipe that are provided at ends of steel pipes to be joined, and one of the inner joint pipe and the outer joint pipe is Protrusions formed on the inner peripheral surface of the outer joint pipe, which are divided at equal intervals in the circumferential direction and configured by split pieces that are radially flexible, and formed on the outer peripheral surface of the inner joint pipe, the outer an engaging portion that engages with the convex portion and resists a tensile load together with the convex portion in a state in which the joint pipe and the inner joint pipe are completely fitted together; is provided for engaging the outer joint tube and the inner joint tube, contacting the protrusion to bend the split piece in cooperation with the protrusion while the outer joint tube and the inner joint tube are being fitted together.
- split pieces are grouped into a plurality of groups that satisfy the following conditions (1) and (2), and the same group is split in the fitting process It is configured to shift the timing to reach the maximum deflection for each piece.
- the split pieces belonging to the same group have the same axial position at which the maximum deflection occurs in the guide portion, and the axial positions are different for each group.
- the split pieces belonging to the same group Connecting the centers of directions with straight lines to form a straight line through the center of the tube or a polygon whose center of gravity coincides with the center of the tube
- the split pieces in one group do not start to flex in the radial direction before the split pieces in one group reach the maximum deflection.
- a steel pipe with a joint according to one aspect of the present invention includes the inner joint pipe and/or the outer joint pipe of the mechanical joint according to the above invention at both ends or one end.
- a method for manufacturing a steel pipe with a joint according to one aspect of the present invention is a method for manufacturing a steel pipe with a joint according to the above invention, wherein the outer joint pipe and/or the inner joint pipe in the mechanical joint according to the above invention are joined. Each is attached to the end of the target steel pipe.
- a structure according to one aspect of the present invention includes the mechanical joint according to the above invention and a plurality of steel pipes joined by the mechanical joint.
- a method for constructing a structure according to an aspect of the present invention is a method for constructing a structure according to the above-described invention, comprising a steel pipe having the outer joint pipe attached to its end, and a steel pipe having the inner joint pipe attached to its end. With one of the attached steel pipes standing in the ground, the other steel pipe is placed on the one steel pipe, and the inner joint pipe and the outer joint pipe are fitted together. Join.
- a method for designing a mechanical joint includes an inner joint pipe and an outer joint pipe provided at ends of steel pipes to be joined, and either one of the inner joint pipe and the outer joint pipe is provided. is divided at equal intervals in the circumferential direction and composed of divided pieces that can be bent in the radial direction, a convex portion formed on the outer peripheral surface of the inner joint pipe, and an engaging portion that engages with the convex portion and resists a tensile load together with the convex portion in a state in which the inner joint pipe and the outer joint pipe are completely fitted;
- the split piece is provided on the distal end side, and in the middle of fitting the inner joint tube and the outer joint tube, the split piece abuts against the convex portion and cooperates with the convex portion to bend and bend the split piece.
- the divided pieces are grouped into a plurality of groups satisfying the following conditions (1) and (2):
- the timing at which the split pieces of the same group reach the maximum deflection is shifted, and the horizontal stress caused by the deflection of the split pieces is offset.
- the split pieces belonging to the same group have the same axial position at which the maximum deflection occurs in the guide portion, and the axial positions are different for each group.
- the split pieces belonging to the same group Connecting the centers of directions with straight lines to form a straight line through the center of the tube or a polygon whose center of gravity coincides with the center of the tube
- a method for designing a mechanical joint according to an aspect of the present invention includes an inner joint pipe and an outer joint pipe that are provided at ends of steel pipes to be joined, and either the inner joint pipe or the outer joint pipe is provided. One of them is divided at equal intervals in the circumferential direction and composed of split pieces that are radially flexible, and includes a convex portion formed on the inner peripheral surface of the outer joint pipe and a convex portion formed on the outer peripheral surface of the inner joint pipe.
- an engaging portion that engages with the convex portion and resists a tensile load together with the convex portion in a state in which the outer joint pipe and the inner joint pipe are completely fitted together; is also provided on the distal end side, and in the middle of fitting the outer joint tube and the inner joint tube, it abuts against the convex portion and cooperates with the convex portion to bend the split piece and bend it. and a guide portion that maintains up to the engaging portion, wherein the divided pieces are divided into a plurality of groups satisfying the following conditions (1) and (2): The split pieces are divided into groups, and the timing at which the split pieces of the same group reach maximum deflection is shifted in the fitting process, and the horizontal stress caused by the deflection of the split pieces is offset.
- the split pieces belonging to the same group have the same axial position at which the maximum deflection occurs in the guide portion, and the axial positions are different for each group.
- the split pieces belonging to the same group Connecting the centers of directions with straight lines to form a straight line through the center of the tube or a polygon whose center of gravity coincides with the center of the tube
- the split pieces are grouped into a plurality of groups so as to satisfy a predetermined condition, and the timing at which the split pieces of the same group reach maximum deflection during the fitting process is shifted. It can reduce the pressing load required for installation and improve workability. Moreover, according to the present invention, the pressing load can be reduced without increasing the number of split pieces, so that the processing cost does not increase and the strength does not decrease.
- FIG. 1A is a diagram showing a mechanical joint according to an embodiment of the present invention, and is a diagram schematically showing how split pieces bend during the joining process.
- FIG. 1B is a diagram showing a mechanical joint according to an embodiment of the present invention, and is a diagram schematically showing how split pieces bend during the joining process.
- FIG. 1C is a diagram showing a mechanical joint according to an embodiment of the present invention, and is a diagram schematically showing how split pieces bend during the joining process.
- FIG. 1D is a diagram showing a mechanical joint according to an embodiment of the present invention, and schematically showing how split pieces bend during the joining process.
- FIG. 2 is a diagram showing an example of grouping eight divided pieces so as to satisfy the conditions of the present invention.
- FIG. 3A is a diagram for explaining an indentation load when a conventional mechanical joint is used as a comparative example.
- FIG. 3B is a diagram for explaining an indentation load when a conventional mechanical joint is used as a comparative example.
- FIG. 3C is a diagram for explaining an indentation load when a conventional mechanical joint is used as a comparative example.
- FIG. 4A is a diagram for explaining an indentation load in a mechanical joint according to one embodiment of the present invention;
- FIG. 4B is a diagram for explaining the indentation load in the mechanical joint according to one embodiment of the present invention.
- FIG. 4C is a diagram for explaining the indentation load in the mechanical joint according to one embodiment of the present invention.
- FIG. 5 is a diagram showing an example of grouping four divided pieces so as to satisfy the conditions of the present invention.
- FIG. 6 is a diagram showing an example of grouping eight divided pieces so as not to satisfy the conditions of the present invention.
- FIG. 7 is a schematic diagram showing a state before fitting of a mechanical joint according to a modification of one embodiment of the present invention.
- FIG. 8 is a schematic diagram showing a state after fitting of a mechanical joint according to a modification of one embodiment of the present invention.
- FIG. 9A is a diagram for explaining a joining process of a mechanical joint according to another aspect;
- FIG. 9B is a diagram for explaining a joining process of a mechanical joint according to another aspect;
- FIG. 9C is a diagram for explaining a joining process of a mechanical joint according to another aspect;
- FIG. 9A is a diagram for explaining a joining process of a mechanical joint according to another aspect
- FIG. 9B is a diagram for explaining a joining process of a mechanical joint according to another aspect
- FIG. 9D is a diagram for explaining a joining process of a mechanical joint according to another aspect
- FIG. 10A is a view showing another aspect of the mechanical joint of FIG. 1A, and a view schematically showing how split pieces bend during the joining process.
- FIG. 10B is a diagram showing another aspect of the mechanical joint of FIG. 1B, and schematically showing how the split pieces bend during the joining process.
- FIG. 10C is a view showing another aspect of the mechanical joint of FIG. 1C, and a view schematically showing how split pieces bend during the joining process.
- FIG. 10D is a view showing another aspect of the mechanical joint of FIG. 1D, and a view schematically showing how split pieces bend during the joining process.
- FIG. 11 is a schematic diagram showing a conventional mechanical joint, showing a state before fitting.
- FIG. 12 is a diagram showing a state after fitting in the mechanical joint of FIG. 11.
- FIG. 13 is a view taken along line AA of FIG. 11.
- FIG. 14A is a diagram for explaining a joining process of a conventional mechanical joint;
- FIG. 14B is a diagram for explaining a joining process of a conventional mechanical joint.
- FIG. 14C is a diagram for explaining a joining process of a conventional mechanical joint;
- FIG. 14D is a diagram for explaining a joining process of a conventional mechanical joint.
- FIG. 15 is a graph showing the relationship between axial displacement and load in one split piece in the joining process shown in FIG.
- FIGS. 11, 12, 13, 14A, 14B, 14C, and 14D Before describing a mechanical joint according to an embodiment of the present invention, the structure of a conventional mechanical joint will be described based on FIGS. 11, 12, 13, 14A, 14B, 14C, and 14D. explain.
- an example of a conventional mechanical joint 23 is composed of an inner joint pipe 5 and an outer joint pipe 25 provided at the ends of steel pipes 3 to be joined.
- the inner joint pipe 5 and the outer joint pipe 25 are arranged vertically facing each other.
- an axial load is applied to the upper inner joint pipe 5 and the inner joint pipe 5 is inserted into the outer joint pipe 25 to fit the inner joint pipe 5 and the outer joint pipe 25 together.
- the upper and lower steel pipes 3 are joined as shown in FIG.
- the inner joint pipe 5 has a base end portion 9 that is welded to the steel pipe 3, and on the tip side of the base end portion 9 is a cylindrical member having an outer diameter smaller than that of the base end portion 9 with a slit extending in the axial direction.
- a split piece 11 is provided which is split to form a .
- FIG. 13 is a view taken along the line AA in FIG. 11, showing only the tip of the split piece 11.
- the mechanical joint 23 is obtained by dividing the tip of the inner joint pipe 5 into, for example, eight, and the eight divided pieces 11 having an arcuate cross section are arranged in the circumferential direction at regular intervals. .
- the split piece 11 can be bent in the radial direction, and a projection 13 projecting outward is formed on the outer peripheral surface of the tip portion.
- the inner diameter of the outer joint pipe 25 is smaller than the outer diameter of the portion of the inner joint pipe 5 where the protrusion 13 is formed, and the inner peripheral surface of the outer joint pipe 25 has a recess 15 formed on the proximal end side.
- FIGS. 14A, 14B, 14C, and 14D schematically show cross sections in the axial direction at the B portion of FIG. 11.
- FIG. 14A an engaging portion 17 and a guide portion 19 are provided on the inner peripheral surface of the outer joint tube 25 .
- the engaging portion 17 constitutes a side wall of the concave portion 15 and engages with the convex portion 13 of the inner joint pipe 5 .
- the guide portion 19 cooperates with the convex portion 13 to bend the split piece 11 while the inner joint tube 5 is being inserted into the outer joint tube 25 to be fitted, and maintains the bent state up to the engaging portion 17 . do.
- the guide portion 19 has an inclined surface portion 19 a that initiates bending of the split piece 11 and guides it to maximum bending, and a flat surface portion 19 b that maintains the maximum bending up to the engaging portion 17 .
- An inclined surface portion 13 a having a shape corresponding to the inclined surface portion 19 a of the guide portion 19 is formed on the outer peripheral side of the distal end of the convex portion 13 of the inner joint pipe 5 .
- FIG. 14A shows the state before the inner joint tube 5 and the outer joint tube 25 are pressed into contact with each other, that is, before the split piece 11 starts bending.
- the axial position of the projection 13 at this time is X 0 .
- FIG. 14B shows a state in which the outer peripheral surface of the convex portion 13 reaches the apex of the inclined surface portion 19a, that is, the split piece 11 is bent most. Also, the axial position of the projection 13 at this time is defined as X1.
- the insertion is advanced while maintaining the split piece 11 in the maximum bending state.
- the axial position of the projection 13 shown in FIG . 14C is defined as X2.
- the axial position of the projection 13 at this time is defined as X3.
- the compressive load acting in the axial direction between the inner joint pipe 5 and the outer joint pipe 25 is applied to the base end portion 9 of the inner joint pipe 5 and the outer joint pipe. 25 tip.
- the tensile load acting in the axial direction between the inner joint pipe 5 and the outer joint pipe 25 is prevented by resist by.
- FIG. 15 is a graph showing the relationship between the axial displacement and the magnitude of the load required to bend and insert one split piece 11 .
- FIG. 15 is a graph showing the load required to insert and fit one split piece 11 while bending it.
- the load as shown in FIG. is necessary for That is, in the case of the mechanical joint 23 shown in FIGS. 11 to 13, since the eight split pieces 11 are uniformly bent, the load required to insert and fit the inner joint tube 5 is shown in FIG. About eight times the load.
- a mechanical joint 1 includes an inner joint pipe 5 and an outer joint pipe 7 provided at the ends of steel pipes 3 to be joined.
- the inner joint tube 5 is circumferentially divided into, for example, eight equal intervals, and is composed of divided pieces 11 that are radially flexible.
- a convex portion 13 is formed on the outer peripheral surface of the split piece 11 .
- an engaging portion 17 is engaged with the convex portion 13 in a state in which the inner joint pipe 5 and the outer joint pipe 7 are completely fitted to resist a tensile load together with the convex portion 13. is provided.
- the guide portion 19 has an inclined surface portion 19 a that starts bending of the split piece 11 and guides it to the maximum bending, and a flat surface portion 19 b that maintains the maximum bending up to the engaging portion 17 .
- An inclined surface portion 13 a having a shape corresponding to the inclined surface portion 19 a of the guide portion 19 is formed on the outer peripheral side of the distal end of the convex portion 13 of the inner joint pipe 5 .
- the inner joint pipe 5 according to this embodiment has the same shape as the conventional example except for the split piece 11 .
- the eight divided pieces 11 according to this embodiment are divided into a plurality of groups that satisfy the following conditions (1) and (2).
- the eight split pieces 11 are configured such that the timing at which the split pieces of the same group reach the maximum deflection differs during the fitting process.
- the number of divisions is 4 or more. If the number of divisions is 3 or less, one division piece may belong to one group, and in this case, the straight line or polygon of condition (2) cannot be formed.
- FIG. 1A is a cross-sectional view of the segmented pieces 11 of A 1 to A 4 and the guide portion 19 of the portion that contacts the segmented pieces 11 of A 1 to A 4 .
- FIG. 1B is a cross-sectional view of the split pieces 11 of B 1 to B 4 and the guide portion 19 of the portion that abuts on the split pieces 11 of B 1 to B 4 .
- 1A and 1B show the initial state of inserting the inner joint pipe 5 into the outer joint pipe 7.
- the inclined surface portion 19a with which the segmented pieces 11 of A 1 to A 4 abut is formed between X 0 and X 1 and is located at the top of the inclined surface portion 19a, which is the position where the deflection is maximum.
- the position is X1.
- the inclined surface portion 19a with which the divided pieces 11 of B 1 to B 4 abut is formed between X 1 and X 2 , and the top of the inclined surface portion 19a, which is the position where the deflection is maximum, The position of is X2.
- FIGS. 1C and 1D show states in which the inner joint tube 5 is further inserted from the positions shown in FIGS. 1A and 1B, respectively.
- the segmented pieces 11 of A 1 to A 4 are in contact with the flat surface portion 19b and maintain the maximum deflection
- the segmented pieces 11 of B 1 to B 4 are in contact with the inclined surface portion 19a. It is in the middle of bending in contact with the
- the axial position at which each split piece 11 reaches the maximum deflection is the same in the same group and different in each group. In other words, in the fitting process, the timing at which the split pieces 11 of the same group reach the maximum deflection is different.
- FIG. 3A shows the load required to bend the four split pieces 11 corresponding to the positions A 1 to A 4 shown in FIG.
- the largest load is required when the segmented pieces 11 of A 1 to A 4 reach the maximum deflection (X 1 ).
- FIG. 3B shows the load required to bend the four split pieces 11 corresponding to positions B 1 to B 4 shown in FIG.
- the split pieces 11 of B 1 to B 4 also reach maximum deflection at the same timing (X 1 ) as the split pieces 11 of A 1 to A 4 , and require the largest load at this time.
- FIG. 3C is a composite of FIGS. 3A and 3B.
- FIG. 3C shows the load required to bend the eight split pieces 11 when the inner joint tube 5 is inserted and fitted into the outer joint tube 25 and the timing thereof. As shown in FIG. 3C, the required load reaches its maximum value when all of the eight segments 11 of A 1 to A 4 and B 1 to B 4 reach their maximum deflection (X 1 ).
- the maximum required load is the sum of the maximum load in FIG. 3A and the maximum load in FIG. 3B.
- 4A, 4B, and 4C respectively show the relationship between the axial displacement and the load required for insertion when the inner joint pipe 5 is inserted and fitted into the outer joint pipe 7 according to this embodiment.
- FIG. 4A shows the load required to bend the four split pieces 11 of A 1 to A 4 and the timing of the bending. As shown in FIG. 4A, the load required to bend the four segments 11 is greatest when the segments A 1 to A 4 reach their maximum deflection (X 1 ).
- FIG. 4B shows the load required to bend the four split pieces 11 of B 1 to B 4 and the timing of the bending. As shown in FIG. 4B, the load required to deflect the four segments 11 is greatest when the segments B 1 to B 4 reach their maximum deflection (X 2 ).
- FIG. 4C is a composite of FIGS. 4A and 4B.
- FIG. 4C shows the load and timing required to bend the eight split pieces 11 when the inner joint tube 5 is inserted into the outer joint tube 7 .
- FIG. 4C by shifting the timing of reaching the maximum deflection for each segment 11 of the same group of A 1 to A 4 and B 1 to B 4 , the timings requiring a large load are distributed to two locations. .
- the maximum value of the load required for inserting the mechanical joint 1 is approximately half of that in FIG. 3C.
- the above example is an example in which the eight segmented pieces 11 are divided into two groups and the timing at which the maximum deflection occurs is shifted between the two groups.
- the maximum load can be further reduced by shifting the timing of maximum deflection. That is, four groups of A 1 and A 3 , A 2 and A 4 , B 1 and B 3 , and B 2 and B 4 shown in FIG. 2 are set.
- the positions of the inclined surface portions 19a of the outer joint pipe 7 are varied in the axial direction so that the timing of reaching the maximum deflection is shifted between these four groups. Thereby, it can be inserted with a load of about 1/4 compared to FIG. 3C.
- the load reduction effect changes depending on the number of groups.
- FIG. 5 shows an example in which the tip of the inner joint tube 5 is divided into four as the minimum number of divisions.
- the straight line connecting the centers of the split pieces 11 in the same group in the circumferential direction passes through the center 21 of the tube, so the condition (2) of the present invention is satisfied.
- the number of split pieces 11 is not limited to a multiple of 2, and may be a multiple of 3 as long as the condition (2) of the present invention is satisfied.
- the tip of the inner joint tube 5 may be divided into nine, and three groups may be set such that the figures formed by connecting the centers of the divided pieces 11 in the circumferential direction with straight lines are equilateral triangles. Even in such a case, the center of gravity of the three equilateral triangles coincides with the center 21 of the pipe, so the present invention is applicable (not shown).
- condition (2) of the present invention is that when the inner joint pipe 5 is inserted into the outer joint pipe 7 and fitted, the stress in the horizontal direction caused by the bending of the split piece 11 is the same. This is a condition for offsetting by the horizontal stress of the other split pieces 11 that bend with timing.
- the stress in the horizontal direction is canceled within the group, and workability during construction is not deteriorated.
- FIG. 6 shows an example in which condition (2) is not satisfied.
- eight divided pieces 11 are divided into three groups A 1 to A 2 , B 1 to B 3 and C 1 to C 3 .
- the straight line connecting the centers of the split pieces 11 in the circumferential direction of A 1 to A 2 does not pass through the center 21 of the tube.
- the stresses in the horizontal direction do not cancel each other out.
- the centers of the segmented pieces 11 of B 1 to B 3 see ⁇ in FIG. 6) and the centers of the segmented pieces 11 of C 1 to C 3 in the circumferential direction (see ⁇ in FIG.
- all the split pieces 11 are grouped into a plurality of groups, and the positions at which the split pieces 11 abut and cause maximum deflection are different for each group.
- the timing at which the split pieces 11 of the same group reach the maximum deflection is shifted during the fitting process, so that the pressing load required for fitting can be reduced, and workability can be improved.
- the pressing load can be reduced without increasing the number of split pieces 11, there is no increase in processing cost or reduction in strength.
- the split pieces 11 in one group before the split pieces 11 in one group reach the maximum deflection, the split pieces 11 in another group do not start to flex in the radial direction.
- the invention is not limited to this.
- the greatest load is required when the split piece 11 reaches its maximum deflection. Therefore, the effect of the present invention can be obtained at least if there is a time difference in the timing of reaching the maximum deflection. Therefore, it is sufficient that at least the positions of the tops of the inclined surface portions 19a are formed so as to differ in the axial direction for each group.
- the split pieces are grouped into a plurality of groups that satisfy the following conditions (1) and (2), and the axial position that causes the maximum deflection of the guide portion formed on the inner peripheral surface of the split piece is determined.
- the split pieces belonging to the same group have the same axial position at which the maximum deflection occurs in the guide portion, and the axial positions are different for each group.
- the split pieces belonging to the same group Connecting the centers of directions with straight lines to form a straight line through the center of the tube or a polygon whose center of gravity coincides with the center of the tube
- the mechanical joint 2 according to the second modified example is composed of an inner joint pipe 5A and an outer joint pipe 7A which are respectively provided at the ends of the steel pipes 3 to be joined.
- 5 A of inner joint pipes and 7 A of outer joint pipes are arrange
- An axial load is applied to the outer joint pipe 7A arranged above in the state shown in FIG. 7 to fit the outer joint pipe 7A onto the inner joint pipe 5A.
- the outer joint pipe 7A and the inner joint pipe 5A are fitted to join the upper and lower steel pipes 3 together.
- the outer joint pipe 7A has a base end portion 9A that is welded to the steel pipe 3, and on the tip side of the base end portion 9A, split pieces are formed by forming slits extending in the axial direction in a cylindrical member. 11A is provided.
- the tip of the outer joint pipe 7A is divided into eight, for example, and the eight divided pieces 11A having an arcuate cross section are arranged in the circumferential direction at regular intervals.
- the split piece 11A is radially flexible, and has an inwardly protruding protrusion 13A formed on the inner peripheral surface of the tip.
- the outer diameter of the inner joint pipe 5A is larger than the inner diameter of the portion of the outer joint pipe 7A where the convex portion 13A is formed, and the concave portion 15A is formed on the base end side of the outer peripheral surface of the inner joint pipe 5A.
- the outer peripheral surface of the inner joint pipe 5A and the convex portion 13A of the outer joint pipe 7A are pressed into contact with each other, so that the split piece 11A of the outer joint pipe 7A expands in diameter. direction outward.
- the bending of the split piece 11A is restored, and the convex portion 13A of the outer joint pipe 7A enters the concave portion 15A of the inner joint pipe 5A to complete the fitting.
- Each divided piece 11A in the second modified example is divided into a plurality of groups that satisfy the conditions (1) and (2) as in the above-described embodiment.
- the eight split pieces 11A are configured such that the timing at which the split pieces of the same group reach the maximum deflection differs during the fitting process.
- the number of divisions is 4 or more on the assumption that the conditions (1) and (2) are satisfied.
- the method of dividing each segment 11A into a plurality of groups is the same as in the first embodiment.
- FIG. 9A is a cross-sectional view of the split piece 11A of A 1 to A 4 and the guide portion 19A of the portion that abuts on the split piece 11A of A 1 to A 4 .
- the outer peripheral surface of the inner joint pipe 5A is provided with an engaging portion 17A that engages with the convex portion 13A and resists the tensile load together with the convex portion 13A when the outer joint pipe 7A and the inner joint pipe 5A are completely fitted.
- FIG. 9B is a cross-sectional view of the split pieces 11A of B 1 to B 4 and the guide portion 19A of the portion that abuts on the split pieces 11A of B 1 to B 4 .
- 9A and 9B show the initial state of fitting the outer joint pipe 7A to the inner joint pipe 5A.
- 9A and 9B are diagrams corresponding to FIGS. 1A and 1B, respectively, described above.
- the inclined surface portion 19a with which the split pieces 11A of A 1 to A 4 abut is formed between X 0 and X 1 and is located at the top of the inclined surface portion 19a, which is the position where the deflection is maximum.
- the position is X1.
- the inclined surface portion 19a with which the segmented pieces 11A of B 1 to B 4 abut is formed between X 1 and X 2 .
- the position of is X2.
- the split pieces 11A of A 1 to A 4 are in the process of contacting the inclined surface portion 19a and being bent, whereas B 1 to A 4 are in the process of bending.
- the B4 split piece 11A is not in contact with the inclined surface portion 19a and is not bent.
- FIGS. 9C and 9D show the state in which the outer joint tube 7A is pushed further from the positions shown in FIGS. 9A and 9B, respectively.
- FIG. 9C shows a state in which the outer joint pipe 7A is pushed in from the position shown in FIG. 9A.
- FIG. 9D shows a state in which the outer joint pipe 7A is pushed in from the position shown in FIG. 9B.
- 9C and 9D correspond to FIGS. 1C and 1D described above, respectively.
- the configuration shown in FIGS. 9A-9D is similar to the mechanical joint according to the present invention described above with respect to FIGS. 1A-1D.
- both the convex portion 13 of the inner joint pipe 5 and the guide portion 19 of the outer joint pipe 7 have the inclined surface portions 13a and 19a.
- the inclined surface portion may be formed only on one side of 19 . If an inclined surface portion is formed on either the convex portion 13 or the guide portion 19, the split piece 11 can be bent by using the press-fitting load for inserting the inner joint pipe 5.
- FIG. Therefore, as another aspect of the mechanical joint 1 of FIG. 1, an example in which the convex portion 13 is formed with the inclined surface portion 13a and the guide portion 19 is not formed with the inclined surface portion 19a is shown in FIG.
- FIG. 10A is a cross-sectional view of the portion of the guide portion 19 that abuts on the split pieces 11 of A 1 to A 4 and the split pieces 11 of A 1 to A 4
- FIG. 10B is a cross-sectional view of the split pieces 11 of B 1 to B 4
- FIG. 4 is a cross-sectional view of a portion of the guide portion 19 that abuts on the split pieces 11 of B 1 to B 4
- 10A and 10B show the initial state of inserting the inner joint pipe 5 into the outer joint pipe 7.
- FIGS. 10C and 10D respectively show a state in which the inner joint tube 5 is further inserted from the positions shown in FIGS. 10A and 10B.
- the position at which the split pieces 11 of A 1 to A 4 and the guide portion 19 contact and the position at which the split pieces 11 of B 1 to B 4 and the guide portion 19 contact are different in the axial direction. By doing so, it is possible to shift the timing of reaching the maximum deflection for each divided piece in the same group.
- the above is an example in which the convex portion 13 is formed with the inclined surface portion 13a and the guide portion 19 is not formed with the inclined surface portion 19a. The same is true when it is not formed.
- the fitting load varies depending on the axial length of the inclined surface portion (specifically, the larger the axial length of the inclined surface portion, the smaller the fitting load), one of the convex portion 13 and the guide portion 19 In the case where the inclined surface portion is formed only on the side, it is more rational to provide the inclined surface portion on the guide portion 19 side because the length of the inclined surface portion in the axial direction can be secured.
- the guide portion 19 (the gray portion in FIG. 1) of the outer joint pipe 7 may be integrated with the outer joint pipe 7, or may be manufactured as a separate member and attached to the inner peripheral surface of the outer joint pipe 7. It may be installed.
- the engaging portion 17 of the outer joint pipe 7 is a portion that resists the tensile load together with the convex portion 13 of the inner joint pipe 5 during fitting, and thus requires high durability. Since only a pressing load is applied and no load is applied during fitting, high durability is not required. Therefore, the guide portion 19 may be manufactured as a separate member with a strength equivalent to that of ordinary steel, and attached to the inner peripheral surface of the outer joint pipe 7 by bolts or welding. I don't mind.
- the guide portion 19 When the guide portion 19 is attached as a separate member, the guide portion 19 and the engaging portion 17 may be brought into contact with each other as shown in FIG. If possible, there may be a gap as shown in FIG.
- the mechanical joint attached to the end of the steel pipe has been described.
- a steel pipe with a joint can be manufactured. That is, the jointed steel pipe described above has the inner joint pipe and/or the outer joint pipe of the mechanical joint described in the embodiment at both ends or one end.
- structures such as steel pipe piles, steel pipe sheet piles, steel pipe sheet pile walls connecting steel pipe sheet piles, steel pipe columns, and steel pipe beams can be formed. That is, these structures include the mechanical joints described in the above embodiments and a plurality of steel pipes joined by the mechanical joints.
- one steel pipe with a joint to be joined is restrained, and the mechanical joint of the other steel pipe with a joint is aligned with the mechanical joint of the one steel pipe with a joint and inserted. It is only necessary to fit them together.
- the structure is a steel pipe pile
- either the steel pipe with the outer joint pipe attached to the end or the steel pipe with the inner joint pipe attached to the end is erected in the ground. If the other steel pipe is placed on top of the other steel pipe by lifting it with a crane, etc., the inner joint pipe is inserted into the outer joint pipe, and the inner joint pipe and the outer joint pipe are fitted and joined. good.
- the mechanical joint of the present invention reduces the load required for insertion and is configured to offset the stress in the horizontal direction during insertion. No need to constrain horizontal movement.
- a mechanical joint design method includes an inner joint pipe and an outer joint pipe provided at ends of steel pipes to be joined, and one of the inner joint pipe and the outer joint pipe is arranged in the circumferential direction.
- a convex portion formed on the outer peripheral surface of the inner joint pipe which is divided into equal intervals and configured by split pieces that can be bent in the radial direction, and a convex portion formed on the inner peripheral surface of the outer joint pipe, and the inner joint pipe an engaging portion that engages with the convex portion and resists a tensile load together with the convex portion in a state where the outer joint pipe and the outer joint pipe are completely fitted together;
- the split piece In the middle of fitting the inner joint tube and the outer joint tube, the split piece abuts on the convex portion and cooperates with the convex portion to bend the split piece, and the bent state is extended to the engaging portion.
- split pieces are grouped into a plurality of groups satisfying the following conditions (1) and (2), and in the fitting process, the same group In order to offset the horizontal stress caused by the bending of the split pieces, the timing of reaching the maximum deflection is shifted for each split piece.
- the split pieces belonging to the same group have the same axial position at which the maximum deflection occurs in the guide portion, and the axial positions are different for each group.
- the split pieces belonging to the same group Connecting the centers of directions with straight lines to form a straight line through the center of the tube or a polygon whose center of gravity coincides with the center of the tube
- a mechanical joint according to another example is designed by the following design method. That is, a mechanical joint design method includes an inner joint pipe and an outer joint pipe provided at ends of steel pipes to be joined, and one of the inner joint pipe and the outer joint pipe is arranged in the circumferential direction.
- a convex portion formed on the inner peripheral surface of the outer joint pipe which is divided into equal intervals and configured by split pieces that can be bent in the radial direction, and a convex portion formed on the outer peripheral surface of the inner joint pipe, and the outer joint pipe an engaging portion that engages with the convex portion and resists a tensile load together with the convex portion in a state where the inner joint pipe and the inner joint pipe are completely fitted together;
- the split piece In the middle of fitting the outer joint tube and the inner joint tube, the split piece abuts against the convex portion and cooperates with the convex portion to bend the split piece, and the bent state is extended to the engaging portion.
- the divided pieces are grouped into a plurality of groups satisfying the following conditions (1) and (2),
- the timing at which the split pieces of the same group reach the maximum deflection is shifted, and the horizontal stress caused by the deflection of the split pieces is offset.
- the split pieces belonging to the same group have the same axial position at which the maximum deflection occurs in the guide portion, and the axial positions are different for each group.
- the split pieces belonging to the same group Connecting the centers of directions with straight lines to form a straight line through the center of the tube or a polygon whose center of gravity coincides with the center of the tube
- the present invention is not limited to the above-described embodiments, and various modifications based on the technical idea of the present invention, and mutual embodiments and modifications. A form in which the examples are combined can be adopted.
- the guide portion 19A and the recessed portion 15A may be provided on the inner peripheral surface of the outer joint pipe 7A, and the convex portion 13A may be provided on the outer peripheral surface of the inner joint pipe 5A.
- the present invention is suitable for application to joining steel pipes.
Abstract
Description
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
(1)同一グループに属する分割片のガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで軸方向位置が異なること
(1)の条件は、嵌合過程において同一グループの分割片ごとに最大撓みに至るタイミング(時期)をずらすためのものである。
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
(2)の条件は、機械式継手の嵌合過程で、分割片11の撓みによって生ずる水平方向の応力が、全体として相殺されるための条件である。
また、上述した実施形態は、内側に挿入する側(内側継手管)を分割した例を示したが、本発明はこれに限られず、機械式継手の第1変形例として、外側に配置される側(外側継手管)を分割する構成を採用してもよい。この場合、外側継手管に径方向に撓み可能な分割片が周方向に等間隔に形成され、分割片の内周面にガイド部が形成される。また、内側継手管においては、基端部の先端側に設けられた基端部より小径の筒状部材の外周面に凸部が形成される。上述した場合も、分割片が下記の条件(1)、(2)を満たす複数のグループにグループ分けし、分割片の内周面に形成されたガイド部の最大撓みを生じさせる軸方向位置をグループごとに異なるようにすれば、嵌合過程において同一グループの分割片ごとに最大撓みに至るタイミングをずらすことができ、上述した実施形態と同様の効果を得ることができる。
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
以下に、この機械式継手の第2変形例について図7、図8、図9A、図9B、図9C、および図9Dに基づいて説明する。図7に示すように、第2変形例による機械式継手2は、接合対象となる鋼管3の端部にそれぞれ設けられる内側継手管5Aと外側継手管7Aとから構成される。内側継手管5Aと外側継手管7Aとは、上下に対向して配置される。図7に示す状態で上方に配置された外側継手管7Aに対して軸方向の荷重をかけて外側継手管7Aを内側継手管5Aに外嵌させる。これにより、図8に示すように、外側継手管7Aと内側継手管5Aとが嵌合されて上下の鋼管3が接合される。
次に、第3変形例について説明する。すなわち、図1に示す例においては、内側継手管5の凸部13と外側継手管7のガイド部19との双方に傾斜面部13a,19aを有するものであったが、凸部13とガイド部19との一方のみに傾斜面部が形成されていてもよい。凸部13とガイド部19とのいずれかに傾斜面部が形成されていれば、内側継手管5を挿入する圧入荷重を用いて分割片11を撓ませることができる。そこで、図1の機械式継手1の他の態様として、凸部13に傾斜面部13aが形成されてガイド部19に傾斜面部19aが形成されていない例を図10に示す。
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
3 鋼管
5,5A 内側継手管
7,7A 外側継手管
9,9A 基端部
11,11A 分割片
13,13A 凸部
13a 傾斜面部
15,15A 凹部
17,17A 係合部
19,19A ガイド部
19a 傾斜面部
19b 平坦面部
21 管の中心
Claims (9)
- 接合対象となる鋼管の端部にそれぞれ設けられる内側継手管と外側継手管とを備え、
前記内側継手管および前記外側継手管のいずれか一方は、周方向に等間隔に分割され、径方向に撓み可能な分割片により構成され、
前記内側継手管の外周面に形成された凸部と、
前記外側継手管の内周面に形成され、前記内側継手管と前記外側継手管とが嵌合完了した状態で前記凸部に係合して前記凸部とともに引張荷重に抵抗する係合部と、
前記外側継手管における前記係合部よりも先端側に設けられ、前記内側継手管と前記外側継手管とを嵌合させる途中において前記凸部に当接して前記凸部と協働して前記分割片を撓ませるとともに撓ませた状態を前記係合部まで維持するガイド部と、を備えた機械式継手であって、
前記分割片は下記の条件(1)、(2)を満たす複数のグループにグループ分けされ、嵌合過程において同一グループの分割片ごとに最大撓みに至るタイミングをずらすように構成された
機械式継手。
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること - 接合対象となる鋼管の端部にそれぞれ設けられる内側継手管と外側継手管とを備え、
前記内側継手管および前記外側継手管のいずれか一方は、周方向に等間隔に分割され、径方向に撓み可能な分割片により構成され、
前記外側継手管の内周面に形成された凸部と、
前記内側継手管の外周面に形成され、前記外側継手管と前記内側継手管とが嵌合完了した状態で前記凸部に係合して前記凸部とともに引張荷重に抵抗する係合部と、
前記内側継手管における前記係合部よりも先端側に設けられ、前記外側継手管と前記内側継手管とを嵌合させる途中において前記凸部に当接して前記凸部と協働して前記分割片を撓ませるとともに撓ませた状態を前記係合部まで維持するガイド部と、を備えた機械式継手であって、
前記分割片は下記の条件(1)、(2)を満たす複数のグループにグループ分けされ、嵌合過程において同一グループの分割片ごとに最大撓みに至るタイミングをずらすように構成された
機械式継手。
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること - 一つの前記グループにおける分割片が最大撓みに至る前に、他のグループにおける分割片に径方向の撓みが開始しない
請求項1または2に記載の機械式継手。 - 請求項1~3のいずれか1項に記載の機械式継手における内側継手管および/または外側継手管を、両端または一端に備える
継手付き鋼管。 - 請求項4に記載の継手付き鋼管を製造する方法であって、
請求項1~3のいずれか1項に記載の機械式継手における外側継手管および/または内側継手管を、接合対象となる鋼管の端部にそれぞれ取り付ける
継手付き鋼管の製造方法。 - 請求項1~3のいずれか1項に記載の機械式継手と、
前記機械式継手によって接合された複数の鋼管と、を備える
構造体。 - 請求項6に記載の構造体を施工する方法であって、
前記外側継手管が端部に取り付けられた鋼管と、前記内側継手管が端部に取り付けられた鋼管とのいずれか一方を地中に立設した状態で、他方の鋼管を前記一方の鋼管の上に配置して、前記内側継手管と前記外側継手管とを嵌合させて接合する
構造体の施工方法。 - 接合対象となる鋼管の端部にそれぞれ設けられる内側継手管と外側継手管を備え、
前記内側継手管および前記外側継手管のいずれか一方は、周方向に等間隔に分割され、径方向に撓み可能な分割片により構成され、
前記内側継手管の外周面に形成された凸部と、
前記外側継手管の内周面に形成され、前記内側継手管と前記外側継手管とが嵌合完了した状態で前記凸部に係合して前記凸部とともに引張荷重に抵抗する係合部と、
前記外側継手管における前記係合部よりも先端側に設けられ、前記内側継手管と前記外側継手管とを嵌合させる途中において前記凸部に当接して前記凸部と協働して前記分割片を撓ませるとともに撓ませた状態を前記係合部まで維持するガイド部と、を備えた機械式継手を設計する機械式継手の設計方法であって、
前記分割片を下記の条件(1)、(2)を満たす複数のグループにグループ分けし、嵌合過程において同一グループの分割片ごとに最大撓みに至るタイミングをずらすとともに分割片の撓みによって生ずる水平方向の応力が相殺されるようにする
機械式継手の設計方法。
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること - 接合対象となる鋼管の端部にそれぞれ設けられる内側継手管と外側継手管とを備え、
前記内側継手管および前記外側継手管のいずれか一方は、周方向に等間隔に分割され、径方向に撓み可能な分割片により構成され、
前記外側継手管の内周面に形成された凸部と、
前記内側継手管の外周面に形成され、前記外側継手管と前記内側継手管とが嵌合完了した状態で前記凸部に係合して前記凸部とともに引張荷重に抵抗する係合部と、
前記内側継手管における前記係合部よりも先端側に設けられ、前記外側継手管と前記内側継手管とを嵌合させる途中において前記凸部に当接して前記凸部と協働して前記分割片を撓ませるとともに撓ませた状態を前記係合部まで維持するガイド部と、を備えた機械式継手を設計する機械式継手の設計方法であって、
前記分割片を下記の条件(1)、(2)を満たす複数のグループにグループ分けし、嵌合過程において同一グループの分割片ごとに最大撓みに至るタイミングをずらすとともに分割片の撓みによって生ずる水平方向の応力が相殺されるようにする
機械式継手の設計方法。
(1)同一グループに属する分割片の前記ガイド部における最大撓みを生じさせる軸方向位置が同じであり、かつ各グループで前記軸方向位置が異なること
(2)同一グループに属する分割片は、周方向の中心を隣り合うもの同士直線で結ぶと、管の中心を通る直線、または重心が管の中心と一致する多角形を形成すること
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KR1020237040100A KR20230174755A (ko) | 2021-06-24 | 2022-06-02 | 기계식 조인트, 조인트 형성 강관, 조인트 형성 강관의 제조 방법, 구조체, 구조체의 시공 방법, 기계식 조인트의 설계 방법 |
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Citations (5)
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JPS544411A (en) * | 1977-06-13 | 1979-01-13 | Shinto Kk | Device of connecting pile |
JPS5760929U (ja) * | 1980-09-24 | 1982-04-10 | ||
JPH08312863A (ja) * | 1993-05-24 | 1996-11-26 | Pilot Ind Inc | 配管接続装置 |
JP2004036329A (ja) * | 2002-07-08 | 2004-02-05 | Jfe Steel Kk | 鋼管の継手構造 |
US7097211B2 (en) * | 2001-11-09 | 2006-08-29 | Adams Robert M | Pipe coupling system having an anti-reversing locking ring |
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US10865922B2 (en) * | 2017-10-05 | 2020-12-15 | Novares Us Engine Components, Inc. | Anti-tamper permanent quick connect coupling device |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS544411A (en) * | 1977-06-13 | 1979-01-13 | Shinto Kk | Device of connecting pile |
JPS5760929U (ja) * | 1980-09-24 | 1982-04-10 | ||
JPH08312863A (ja) * | 1993-05-24 | 1996-11-26 | Pilot Ind Inc | 配管接続装置 |
US7097211B2 (en) * | 2001-11-09 | 2006-08-29 | Adams Robert M | Pipe coupling system having an anti-reversing locking ring |
JP2004036329A (ja) * | 2002-07-08 | 2004-02-05 | Jfe Steel Kk | 鋼管の継手構造 |
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