WO2022270266A1 - 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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- WO2022270266A1 WO2022270266A1 PCT/JP2022/022470 JP2022022470W WO2022270266A1 WO 2022270266 A1 WO2022270266 A1 WO 2022270266A1 JP 2022022470 W JP2022022470 W JP 2022022470W WO 2022270266 A1 WO2022270266 A1 WO 2022270266A1
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- Prior art keywords
- joint pipe
- pipe
- joint
- outer joint
- convex portion
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims description 43
- 238000010276 construction Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 25
- 238000005452 bending Methods 0.000 description 19
- 238000005304 joining Methods 0.000 description 18
- 238000003780 insertion Methods 0.000 description 11
- 230000037431 insertion Effects 0.000 description 11
- 238000012986 modification Methods 0.000 description 10
- 230000004048 modification Effects 0.000 description 10
- 238000007373 indentation Methods 0.000 description 7
- 238000003825 pressing Methods 0.000 description 6
- 230000004323 axial length Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000013011 mating 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
-
- 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
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
- E02D5/526—Connection means between pile segments
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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 A projection formed on the outer peripheral surface of the inner joint pipe, which is divided in the direction at equal intervals and configured by split pieces that are radially flexible, and a convex portion formed on the inner peripheral surface of the outer joint pipe, the inner joint 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 pipe and the outer joint pipe are completely fitted; a slanted surface portion that abuts on the convex portion in the middle of fitting the inner joint pipe and the outer joint pipe and cooperates with the convex portion to bend the split piece.
- the inclined surface portion is provided continuously from the end portion of the outer joint pipe to the engaging portion.
- 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 A convex portion formed on the inner peripheral surface of the outer joint pipe and 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 pipe and the inner joint pipe are completely fitted; a slanted surface portion that abuts on the convex portion and cooperates with the convex portion to deflect the split piece while the outer joint pipe and the inner joint pipe are being fitted together.
- the inclined surface portion is provided continuously from the end portion of the inner joint pipe to the engaging portion.
- 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 of the mechanical joint according to the above invention are joined. It is attached to each end of the 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 The other steel pipe is placed on top of the one steel pipe with one of the two steel pipes standing in the ground, and the outer joint pipe and the inner joint pipe are fitted and joined. .
- 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.
- 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; an inclined surface portion provided on a distal end side, which abuts on the convex portion and bends the split piece in cooperation with the convex portion while the inner joint pipe and the outer joint pipe are being fitted together.
- the inclined surface portion is provided continuously from the end portion of the outer joint tube to the engaging portion, and a vertical load is converted into a horizontal stress that bends the split pieces.
- 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.
- 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; an inclined surface portion provided on a distal end side, which abuts on the convex portion and bends the split piece in cooperation with the convex portion while the outer joint pipe and the inner joint pipe are being fitted together.
- the inclined surface portion is provided continuously from the end portion of the inner joint tube to the engaging portion, and a vertical load is converted into a horizontal stress that bends the split pieces.
- the inclined surface portion is provided continuously from the end portion of the outer joint pipe to the engaging portion, the maximum pushing load in the fitting process is smaller than before, and workability is improved.
- the pressing load can be reduced without increasing the number of split pieces, there is no increase in processing cost or reduction in strength.
- FIG. 1A is a diagram of a mechanical joint according to an embodiment of the present invention, and is a diagram schematically showing the state of bending of split pieces during the joining process.
- FIG. 1B is a diagram of a mechanical joint according to an embodiment of the present invention, and is a diagram schematically showing the bending state of the split pieces during the joining process.
- FIG. 1C is a diagram of a mechanical joint according to one embodiment of the present invention, and is a diagram schematically showing the state of bending of the split pieces during the joining process.
- FIG. 1D is a diagram of a mechanical joint according to an embodiment of the present invention, and is a diagram schematically showing the state of bending of the split pieces during the joining process.
- FIG. 2 is a graph showing the relationship between axial displacement and load in the joining process, where the dashed line shows the case of the conventional mechanical joint shown in FIG. 5, and the solid line shows the case of the mechanical joint shown in FIG. is.
- FIG. 3 is a schematic diagram showing a conventional mechanical joint, showing a state before fitting. 4 is a diagram showing a state after fitting in the mechanical joint of FIG. 3.
- FIG. 5A is a diagram illustrating a joining process of a conventional mechanical joint.
- FIG. 5B is a diagram illustrating a joining process of a conventional mechanical joint.
- FIG. 5C is a diagram illustrating a joining process of a conventional mechanical joint.
- FIG. 5D is a diagram illustrating a joining process of a conventional mechanical joint.
- FIG. 5A is a diagram illustrating a joining process of a conventional mechanical joint.
- FIG. 5B is a diagram illustrating a joining process of a conventional mechanical joint.
- FIG. 5C is a diagram illustrating a joining process
- FIG. 5C is a graph showing the relationship between axial displacement and load during the joining process in FIGS. 5A-5D;
- FIG. 7A is a diagram for explaining the conversion relationship between the press-fit load W and the horizontal force P on the inclined surface portion.
- FIG. 7B is a diagram for explaining the conversion relationship between the press-fit load W and the horizontal force P on the inclined surface portion.
- FIG. 8A is a diagram illustrating the relationship between the inclination angle ⁇ , the length L of the inclined surface portion, and the height H of the engaging portion.
- FIG. 8B is a diagram illustrating the relationship between the inclination angle ⁇ , the length L of the inclined surface portion, and the height H of the engaging portion.
- FIG. 9 is a diagram for explaining the relationship between the length L of the inclined surface portion and the press-fit load W/horizontal force P.
- FIG. 10 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. 11 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. 3 an example of a conventional mechanical joint 21 is composed of an inner joint pipe 5 and an outer joint pipe 23 provided at the ends of steel pipes 3 to be joined.
- the inner joint pipe 5 and the outer joint pipe 23 are arranged vertically facing each other.
- an axial load is applied to the inner joint pipe 5 placed above and the inner joint pipe 5 is inserted into the outer joint pipe 23 to fit the inner joint pipe 5 and the outer joint pipe 23 together. to join the upper and lower steel pipes 3 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. are provided at equal intervals in the circumferential direction.
- 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 23 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 23 is formed with a recess 15 on the proximal end side.
- FIGS. 5A, 5B, 5C, and 5D schematically show cross sections in the axial direction in the A part of FIG. 3.
- FIG. 5A an engaging portion 17 and a guide portion 25 are provided on the inner peripheral surface of the outer joint tube 23 .
- 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 25 cooperates with the convex portion 13 to bend the split piece 11 while inserting and fitting the inner joint tube 5 into the outer joint tube 23 , and maintains the bent state up to the engaging portion 17 . .
- the guide portion 25 has an inclined surface portion 25 a that initiates bending of the split piece 11 and guides it to maximum bending, and a flat surface portion 25 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 25 a of the guide portion 25 is formed on the outer peripheral side of the distal end of the convex portion 13 of the inner joint pipe 5 .
- FIG. 5A shows the state before the inner joint tube 5 and the outer joint tube 23 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. 5B shows a state in which the outer peripheral surface of the convex portion 13 reaches the apex of the inclined surface portion 25a, that is, the split piece 11 is most bent. Also, the axial position of the projection 13 at this time is defined as X1.
- the insertion proceeds while maintaining the split piece 11 in the maximum bending state.
- the axial position of the projection 13 in FIG . 5C 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 of the inner joint pipe 5 and the outer joint pipe 23 is Resist by tip and.
- the tensile load acting in the axial direction between the inner joint pipe 5 and the outer joint pipe 23 is prevented by resist by.
- FIG. 6 is a graph showing the relationship between the axial displacement and the magnitude of the load required for insertion.
- FIG. 7A is a diagram showing a state when the inclined surface portion 25a of the guide portion 25 and the inclined surface portion 13a of the convex portion 13 are in contact during the insertion and fitting process.
- FIG. 7B is a diagram schematically showing an enlarged portion surrounded by a dashed circle in FIG. 7A.
- the press-fit load W and the horizontal force P shown in FIG. 7B can be described by the following equations (1) and (2), respectively.
- P N sin ⁇ F cos ⁇ (1)
- W N cos ⁇ +F sin ⁇ (2)
- N is the force perpendicular to the inclined surface portions 13a and 25a
- F is the frictional force
- ⁇ is the inclination of the inclined surface portion 25a (hereinafter also simply referred to as the inclination ⁇ ).
- the frictional force F is represented by the following equation (3).
- F ⁇ N (3)
- ⁇ is the coefficient of friction between the inclined surface portions 13a and 25a.
- FIGS. 8A and 8B are diagrams for explaining the relationship between the inclination angle ⁇ , the length L of the inclined surface portion, and the height H of the engaging portion.
- the inclination ⁇ of the inclined surface portion 25a is determined by the axial length L of the inclined surface portion 25a (hereinafter simply referred to as the length L) and the height H of the engaging portion 17, that is, the recessed portion 15 determined by the depth of Specifically, it is represented by the following equation (5).
- ⁇ tan ⁇ 1 (L/H) (5)
- the coefficient of friction ⁇ between steel materials is considered to be about 0.05 or more and 0.20 or less, assuming the use of a lubricant.
- the length L of the inclined surface portion 25a depends on the diameter of the steel pipe 3, but is generally about 200 mm or more and 400 mm or less.
- the standard height H of the engaging portion 17 is considered to be about 4 mm or more and 7 mm or less.
- FIG. 9 shows the relationship between the press-fit load W normalized by the horizontal force P, that is, the press-fit load W/horizontal force P and the length L of the inclined surface portion.
- the height H of the engaging portion 17 is constant and the coefficient of friction ⁇ between the steel materials is varied.
- the length L of the inclined surface portion 25a is The value of press-fitting load W/horizontal force P decreases as the length increases.
- a decrease in the value of the press-fit load W/horizontal force P means that the press-fit load W required to obtain a predetermined horizontal force P is decreased. That is, by lengthening the inclined surface portion 25a, the press-fitting load W can be converted into the horizontal force P more efficiently.
- 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 divided in the circumferential direction at equal intervals and composed of divided pieces 11 that are radially flexible.
- a convex portion 13 is formed on the outer peripheral surface of each split piece 11 .
- An inclined surface portion 13a having a shape corresponding to an inclined surface portion 19 of the outer joint pipe 7, which will be described later, is formed on the outer peripheral side of the distal end of the convex portion 13. As shown in FIG.
- 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.
- FIGS. 1A, 1B, 1C, and 1D are diagrams schematically showing axial cross-sections in section A of FIG. 3, similarly to FIGS. 5A to 5D.
- the outer joint tube 7 according to the present embodiment, it abuts on the convex portion 13 while the inner joint tube 5 and the outer joint tube 7 are being fitted to each other on the tip side of the engaging portion 17.
- An inclined surface portion 19 is provided for bending the split piece 11 in cooperation with the convex portion 13 .
- the outer joint pipe 23 of the conventional mechanical joint 21 is provided with a guide portion 25 having an inclined surface portion 25a and a flat surface portion 25b.
- FIG. 1A in the outer joint tube 7 according to the present embodiment, it abuts on the convex portion 13 while the inner joint tube 5 and the outer joint tube 7 are being fitted to each other on the tip side of the engaging portion 17.
- An inclined surface portion 19 is provided for bending the split piece 11 in cooperation with the convex portion 13 .
- the outer joint tube 7 has a portion corresponding to the guide portion 25 formed of the inclined surface portion 19 and does not have a portion corresponding to the flat surface portion 25b.
- the inclined surface portion 19 of the outer joint pipe 7 has a length from the tip of the outer joint pipe 7 to the engaging portion 17, which is longer than the inclined surface portion 25a provided on the conventional outer joint pipe 23. It's becoming
- the inclined surface portion 19 is preferably provided over the entire length from the end portion of the outer joint pipe 7 to the engaging portion 17 .
- the axial length L of the inclined surface portion 19 can be set longer, thereby further reducing the press-fit load. can be done. Note that the longer the joint itself, the higher the material and processing costs of the joint. It is desirable that the length be such that the necessary indentation load can be secured by the weight of the upper steel pipe and the upper joint.
- FIG. 1A shows the state before the inner joint tube 5 and the outer joint tube 7 are brought into pressure contact, that is, before the split piece 11 starts bending.
- the axial position of the projection 13 in FIG. 1A is the same as in FIG. 5A.
- the inclined surface portion 13 a of the convex portion 13 of the inner joint pipe 5 moves toward the inclined surface of the outer joint pipe 7 . contact with the surface portion 19; As a result, the convex portion 13 of the inner joint pipe 5 is pressed and the split piece 11 is bent radially inward.
- the insertion is advanced while maintaining the state of maximum bending in the split piece 11 .
- the axial position of the projection 13 at this time is defined as X'2 .
- FIG. 1D when the distal end portion of the outer joint tube 7 abuts the proximal end portion 9 of the inner joint tube 5, the bending of the split piece 11 is restored, and the convex portion 13 and the engaging portion 17 are separated. are engaged to complete the joining. Note that the axial position of the projection 13 in FIG. 1D is the same as in FIG. 5D.
- FIG. 2 like FIG. 6, is a graph showing the relationship between the axial displacement and the magnitude of the load required for insertion.
- the case of the conventional mechanical joint 21 (similar to FIG. 6) is indicated by a dotted line, and the case of the mechanical joint 1 according to this embodiment is indicated by a solid line.
- the inclined surface portion 19 of the outer joint pipe and the inclined surface portion 13a of the inner joint pipe are brought into contact with each other, and the split piece 11 is bent and inserted into the fitting process (X 0 to X′ 1 ).
- the load gradually increases.
- the slope of the load increase is gentler than that of the conventional outer joint pipe 23 (dashed line), and the maximum value of the load is also reduced. It can be seen that This is because the slope portion 19 according to the present embodiment formed between X 0 and X′ 1 is larger than the prior art slope portion 25a (see FIG. 5A) formed between X 0 and X 1 .
- the press-fit load is efficiently converted into a horizontal force.
- 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, an increase in processing cost and a decrease in strength can be suppressed.
- FIG. 10 the mechanical joint 2 according to the second modification 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. 10 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.
- An inclined surface portion 13a having a shape corresponding to the inclined surface portion 19 of the inner joint pipe 5A is formed on the inner peripheral side of the distal end of the convex portion 13A of the outer joint pipe 7A.
- an engaging portion 17 that engages with the convex portion 13A and resists the tensile load together with the convex portion 13A. (not shown) are provided.
- 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, thereby separating the split pieces 11A of the outer joint pipe 7A. bends radially inward.
- the bending of the split piece 11A returns and the projection 13A of the outer joint pipe 7A enters the recess 15A of the inner joint pipe 5A to complete the fitting.
- the outer joint pipe 7 becomes the inner joint pipe 5A and the inner joint pipe 5 becomes the outer joint pipe 7A, which is the same as the so-called interchanged state. In other words, in the examples shown in FIGS.
- the mechanical joint attached to the end of the steel pipe was described, but the outer joint pipe and/or the inner joint pipe in this mechanical joint are preliminarily prepared at the factory or the like at the end of the steel pipe to be joined.
- a joint-equipped steel pipe can be manufactured by attaching the joints to the respective parts by welding or the like. That is, the jointed steel pipe 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.
- 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.
- the mechanical joint is designed by the following design method. That is, an inner joint pipe and an outer joint pipe are provided at the ends of the steel pipes to be joined, and either the inner joint pipe or the outer joint pipe is divided at equal intervals in the circumferential direction, and a convex portion formed on the outer peripheral surface of the inner joint pipe and formed on the inner peripheral surface of the outer joint pipe, and the inner joint pipe and the outer joint pipe are fitted together.
- a method of designing a mechanical joint comprising: an inclined surface portion that abuts on the convex portion and bends the split piece in cooperation with the convex portion in the middle of fitting with the joint pipe, the inclined surface portion is continuously provided from the end of the outer joint tube to the engaging portion, and converts a vertical load into a horizontal stress that bends the split piece.
- the mechanical joint may be designed by the following design method. That is, an inner joint pipe and an outer joint pipe are provided at the ends of the steel pipes to be joined, and either one of the inner joint pipe and the outer joint pipe is divided at equal intervals in the circumferential direction, a convex portion formed on the inner peripheral surface of the outer joint pipe and formed on the outer peripheral surface of the inner joint pipe, and the outer joint pipe and the inner joint pipe are fitted together.
- a method of designing a mechanical joint comprising: an inclined surface portion that abuts on the convex portion and bends the split piece in cooperation with the convex portion in the middle of fitting with the joint pipe, the inclined surface portion is continuously provided from the end of the outer joint tube to the engaging portion, and converts a vertical load into a horizontal stress that bends the split piece.
- 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 inclined surface portion 19 and the concave 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.
- Reference Signs List 1 2 mechanical joint 3 steel pipe 5, 5A inner joint pipe 7, 7A outer joint pipe 9, 9A base end portion 11, 11A split piece 13, 13A convex portion 13a inclined surface portion 15, 15A concave portion 17 engaging portion 19 inclined surface portion
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Abstract
Description
本発明の一実施形態に係る機械式継手を説明するに先立って、従来の機械式継手の構造について図3および図4に基づいて説明する。図3に示すように、従来の機械式継手21の一例は、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5と外側継手管23とから構成される。内側継手管5と外側継手管23とは、上下に対向して配置される。図3の状態において、上方に配置された内側継手管5に軸方向の荷重をかけて内側継手管5を外側継手管23に挿入し、内側継手管5と外側継手管23とを嵌合させて、図4に示すように上下の鋼管3を接合させる。
P=Nsinθ-Fcosθ …(1)
W=Ncosθ+Fsinθ …(2)
ここで、Nは傾斜面部13a,25aに対して垂直な方向の抗力、Fは摩擦力、θは傾斜面部25aの傾き(以下、単に傾きθともいう)である。
F=μN …(3)
ここで、μは傾斜面部13a,25a間の摩擦係数である。
P=W×(sinθ-μcosθ)/(cosθ+μsinθ) …(4)
θ=tan-1(L/H) …(5)
また、上述した実施形態においては、内側に挿入する側(内側継手管)を分割した例について説明したが、本発明はこれに限られず、外側に配置される側(外側継手管)を分割してもよい。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、さらに分割片の内周面に傾斜面部が形成される。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。
次に、第2変形例について、図10および図11に基づいて説明する。図10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10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11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。
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 係合部
19 傾斜面部
Claims (8)
- 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、周方向に等間隔で分割され、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傾斜面部と、を備えた機械式継手であって、
前記傾斜面部は、前記外側継手管の端部から前記係合部まで連続して設けられている
機械式継手。 - 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、周方向に等間隔で分割され、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傾斜面部と、を備えた機械式継手であって、
前記傾斜面部は、前記内側継手管の端部から前記係合部まで連続して設けられている
機械式継手。 - 請求項1または2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3に記載の継手付き鋼管の製造方法であって、
請求項1または2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または2に記載の機械式継手と、
該機械式継手で接合された複数の鋼管と、を備える
構造体。 - 請求項5に記載の構造体の施工方法であって、
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、前記外側継手管と前記内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、周方向に等間隔で分割され、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傾斜面部と、を備えた機械式継手の設計方法であって、
前記傾斜面部を、前記外側継手管の端部から前記係合部まで連続して設け、鉛直荷重を、前記分割片を撓ませる水平応力に変換させる
機械式継手の設計方法。 - 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、周方向に等間隔で分割され、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傾斜面部と、を備えた機械式継手の設計方法であって、
前記傾斜面部を、前記内側継手管の端部から前記係合部まで連続して設け、鉛直荷重を、前記分割片を撓ませる水平応力に変換させる
機械式継手の設計方法。
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Citations (3)
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 |
JP2003003463A (ja) * | 2001-06-21 | 2003-01-08 | Geotop Corp | 杭の継手部構造 |
JP2006002436A (ja) * | 2004-06-17 | 2006-01-05 | Fudo Constr Co Ltd | 鋼管の継手構造 |
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JPS544411A (en) * | 1977-06-13 | 1979-01-13 | Shinto Kk | Device of connecting pile |
JP2003003463A (ja) * | 2001-06-21 | 2003-01-08 | Geotop Corp | 杭の継手部構造 |
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