AU2016360218B2 - Joint structure for steel pipe pile - Google Patents
Joint structure for steel pipe pile Download PDFInfo
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- AU2016360218B2 AU2016360218B2 AU2016360218A AU2016360218A AU2016360218B2 AU 2016360218 B2 AU2016360218 B2 AU 2016360218B2 AU 2016360218 A AU2016360218 A AU 2016360218A AU 2016360218 A AU2016360218 A AU 2016360218A AU 2016360218 B2 AU2016360218 B2 AU 2016360218B2
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- steel pipe
- section
- pipe pile
- fitting
- outer fitting
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- 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
Abstract
A joint structure for a steel pipe pile in which a first steel pipe pile having an outer fitting end part and a second steel pipe pile having an inner fitting end part are coupled while the outer fitting end and the inner fitting end share the same axis center line, wherein when viewed in cross-section along the axis center line, outer fitting step parts (or inner fitting step parts) are provided at multiple positions along the axis center line on the inner side (or the outer side) of the outer fitting end part (or the inner fitting end part), so as to gradually increase (or decrease) in diameter toward the second steel pipe pile (or the first steel pipe pile); each outer fitting step part (or inner fitting step part) has an outer fitting crest part (or inner fitting crest part) relatively near the second steel pipe pile (or the first steel pipe pile), and an outer fitting root part (or inner fitting root part) adjacent to the outer fitting crest part (or inner fitting crest part); and the ratio obtained by dividing the plate thickness at the outer fitting root part nearest to the second steel pipe pile by the plate thickness of the inner fitting root part nearest to the first steel pipe pile is 0.84 or more.
Description
[Document Type] Specification [Title of the Invention] JOINT STRUCTURE FOR STEEL PIPE PILE [Technical Field of the Invention] [0001]
The present invention relates to a joint structure for a steel pipe pile.
Priority is claimed on Japanese Patent Application No. 2015-231400, filed on November 27, 2015, the content of which is incorporated herein by reference.
[Related Art] [0002]
In the related art, in order to realize easy construction on a narrow area or to reduce a construction period, there has been a demand for non-welding mechanical joints. For example, for the purpose of coupling a plurality of steel pipe piles in an axial direction using a mechanical joint, joint structures for a steel pipe pile disclosed in Patent Documents 1 and 2 have been proposed.
[0003]
In the joint structure for a steel pipe pile disclosed in Patent Document 1, a pair of an outer fitting end section and an inner fitting end section freely fitted to each other is individually formed in a first pile and a second pile adjacent to each other in the axial direction. In this joint structure, in a state where the outer fitting end section and the inner fitting end section are fitted to each other, an engagement section and an engagement target section which engage with each other by relatively rotating around an axial center are formed. In the joint structure for a steel pipe pile disclosed in Patent Document 1, separation preventing units are provided in the engagement section and the engagement target section in order to prevent the engagement section and the engagement target section in an engaged state from being separated in a radial
- 1 direction of the first pile or the second pile.
[0004]
In the joint structure for a steel pipe pile disclosed in Patent Document 2, a pair of an outer fitting end section and an inner fitting end section freely fitted to each other is individually formed in a first pile and a second pile adjacent to each other in the axial direction. In this joint structure, in a state where the outer fitting end section and the inner fitting end section are fitted to each other, a plurality of engagement protrusions and a plurality of engagement target protrusions which respectively engage with each other by relatively rotating around an axial center are formed in the axial direction. In the joint structure for a steel pipe pile disclosed in Patent Document 2, the outer fitting end section is formed such that a location for forming the engagement protrusion provided on a front end portion side has a diameter larger than a location for forming the engagement protrusion provided on a base end portion side. In addition, the inner fitting end section is formed such that a location for forming the engagement target protrusion provided on the front end portion side has a diameter smaller than a location for forming the engagement target protrusion provided on the base end portion side.
[Prior Art Document] [Patent Document] [0005] [Patent Document 1] Japanese Unexamined Patent Application, First Publication No. Hl 1-43937 [Patent Document 2] Japanese Unexamined Patent Application, First
Publication No. Hl 1-43936 [Disclosure of the Invention] . ί .
[Problems to be Solved by the Invention] [0006]
Here, in a joint structure for a steel pipe pile, in a state where a plurality of steel pipe piles are coupled to each other in an axial direction, forces for compression, tension, and bending act on a joint section. In a joint structure for a steel pipe pile disclosed in Patent Document 1, although a burden rate of forces for compression, tension, and bending varies from a base end side to a front end side of an outer fitting end section and an inner fitting end section, a plate thickness of an engagement target section is entirely the same in the axial direction. Therefore, in the joint structure for a steel pipe pile disclosed in Patent Document 1, a vain part increases particularly in the plate thicknesses of the outer fitting end section and the inner fitting end section on the front end side, thereby resulting in a problem that the plate thicknesses increase unnecessarily and cost increases.
[0007]
In contrast, in a joint structure for a steel pipe pile disclosed in Patent Document 2, a burden rate of forces for compression, tension, and bending is taken into consideration by gradually reducing plate thicknesses of engagement target protrusions from a base end side toward a front end side of an outer fitting end section and an inner fitting end section. However, in the joint structure for a steel pipe pile disclosed in Patent Document 2, the plate thicknesses of the engagement target protrusions are the same in the outer fitting end section and the inner fitting end section, thereby resulting in a problem that a steel weight of the entire joint increases unnecessarily and cost increases.
[0008]
The joint structure for a steel pipe pile disclosed in Patent Document 2 is
- 3 formed to be tapered in the axial direction by gradually reducing the plate thicknesses of the engagement target protrusions from the base end side toward the front end side of the outer fitting end section and the inner fitting end section. However, in the joint structure for a steel pipe pile disclosed in Patent Document 2, the ratio of the protruding height of a compressive surface and the protruding height of a tensile surface is less than 0.50. Therefore, it is not possible to minimize the steel weight of the entire joint for ensuring equal proof stress for compression, tension, and bending, thereby resulting in a problem that material cost increases.
[0009]
The present invention has been made in consideration of the foregoing circumstances, and an object thereof is to provide a joint structure for a steel pipe pile, in which workability is improved through weight reduction.
[Means for Solving the Problem] [0010] (1) According to an aspect of the present invention, there is provided a joint structure for a steel pipe pile, in which a first steel pipe pile having an outer fitting end section and a second steel pipe pile having an inner fitting end section are coupled to each other in a state where the outer fitting end section and the inner fitting end section share the same axial line. The joint structure includes, in a case of being seen in a cross section along the axial line, outer fitting stepped sections that are provided at a plurality of positions along the axial line on an inner side of the outer fitting end section such that diameters increase in steps toward the second steel pipe pile, in which each of the outer fitting stepped sections has an outer fitting peak section relatively close to the second steel pipe pile and an outer fitting valley section adjacent to the outer fitting peak section; and inner fitting stepped sections that are provided at a plurality of positions along the axial line on an outer side of the inner fitting end section such that diameters decrease in steps toward the first steel pipe pile, in which each of the inner fitting stepped sections has an inner fitting peak section relatively close to the first steel pipe pile and an inner fitting valley section adjacent to the inner fitting peak section. Each of the inner fitting peak sections is interlocked with each of the outer fitting peak sections in a state where the inner fitting end section is inserted into the outer fitting end section and is relatively rotated about the axial line. In each of the outer fitting peak sections, a ratio obtained by dividing a protruding height of the outer fitting peak section next to the outer fitting peak section relatively close to the second steel pipe pile by a protruding height of the outer fitting peak section relatively close to the second steel pipe pile ranges from 0.5 to 0.9. In each of the inner fitting peak sections, a ratio obtained by dividing a protruding height of the inner fitting peak section next to the inner fitting peak section relatively close to the first steel pipe pile by a protruding height of the inner fitting peak section relatively close to the first steel pipe pile ranges from 0.5 to 0.9. A plate thickness of the outer fitting valley section closest to the second steel pipe pile is smaller than a plate thickness of the inner fitting valley section closest to the first steel pipe pile, and a ratio obtained by dividing the plate thickness of the outer fitting valley section closest to the second steel pipe pile by the plate thickness of the inner fitting valley section closest to the first steel pipe pile is equal to or greater than 0.84.
[0011]
According to the joint structure for a steel pipe pile having the configuration described above, a joint for a steel pipe pile can be reduced in weight, so that workability is improved.
[0012] (2) In the joint structure for a steel pipe pile according to (1), a ratio obtained by dividing the plate thickness of the outer fitting valley section closest to the second steel pipe pile by the plate thickness of the inner fitting valley section closest to the first steel pipe pile may range from 0,84 to 0.94.
[0013]
In this case, a joint for a steel pipe pile can be further reduced in weight.
[0014] (3) In the joint structure for a steel pipe pile according to (1) or (2), in each of the outer fitting peak sections, a ratio obtained by dividing the protruding height of the outer fitting peak section next to the outer fitting peak section relatively close to the second steel pipe pile by the protruding height of the outer fitting peak section relatively close to the second steel pipe pile may range from 0.6 to 0.8. In each of the inner fitting peak sections, a ratio obtained by dividing the protruding height of the inner fitting peak section next to the inner fitting peak section relatively close to the first steel pipe pile by the protruding height of the inner fitting peak section relatively close to the first steel pipe pile may range from 0.6 to 0.8.
[0015]
In this case, a joint for a steel pipe pile can be reduced in weight while the strength of the joint for a steel pipe pile is maintained.
[Effects of the Invention] [0016]
According to the joint structure for a steel pipe pile of the aspect of the present invention, workability is improved by reducing the weight of a joint. [Brief Description of the Drawings] [0017]
- 6 FIG. 1 is a perspective view showing a joint structure for a steel pipe pile according to a first embodiment of the present invention.
FIG. 2 is a view showing an outer fitting end section of the same joint structure for a steel pipe pile and is a cross-sectional view in a case of being seen in a cross section including an axial line.
FIG. 3 is a view showing the outer fitting end section of the same joint structure for a steel pipe pile and is a part of a cross-sectional view of a part A in FIG. 2.
FIG. 4 is a side view showing an inner fitting end section of the same joint structure for a steel pipe pile.
FIG. 5 is a view showing the inner fitting end section of the same joint structure for a steel pipe pile and is a part of a cross-sectional view of a part B in FIG 4.
FIG. 6 is a perspective view showing the inner fitting end section being inserted into the outer fitting end section in the same joint structure for a steel pipe pile.
FIG. 7 is a perspective view showing a state where the inner fitting end section is rotated with respect to the outer fitting end section in the same joint structure for a steel pipe pile and shows a part of the outer fitting end section in a cross section.
FIG. 8 is a part of a cross-sectional view of a part C in FIG 7 and is a view showing a tensile force acting on a tensile surface of the same joint structure for a steel pipe pile.
FIG. 9 is a part of a cross-sectional view of the part C in FIG 7 and is a view showing a compressive force acting on a compressive surface of the same joint structure for a steel pipe pile.
- 7 FIG. 10 is a part of a cross-sectional view showing plate thicknesses of outer fitting stepped sections and inner fitting stepped sections of the same joint structure for a steel pipe pile.
FIG. 11 is a view showing a joint structure for a steel pipe pile in the related art and is a part of a cross-sectional view showing plate thicknesses of outer fitting stepped sections and inner fitting stepped sections.
FIG. 12 is a part of a cross-sectional view showing a modification example of an outer fitting extra length section and an inner fitting extra length section in the same joint structure for a steel pipe pile.
FIG. 13 shows parts of cross-sectional views of joint structures for a steel pipe pile, in which (a) shows the plate thicknesses of the outer fitting stepped sections and the inner fitting stepped sections of the joint structure according to the embodiment, (b) shows the plate thicknesses of the outer fitting stepped sections and the inner fitting stepped sections of the joint structure in the related art, and (c) shows a comparison between the plate thicknesses of (a) and (b).
FIG. 14 is a graph showing a relationship, in the joint structure for a steel pipe pile according to the embodiment, between a radius thickness ratio of an outer diameter of the steel pipe pile and the plate thickness of the outer fitting end section, and a ratio of a maximum bending moment to the a plastic bending moment of the steel pipe pile.
FIG. 15A is a graph showing a relationship between a radius thickness ratio and a proof stress ratio of the inner fitting end section and is a graph showing a relationship between a radius thickness ratio and a proof stress ratio of the inner fitting end section in the joint structure for a steel pipe pile according to the embodiment.
FIG. 15B is a graph showing a relationship between a radius thickness ratio
- 8 and a proof stress ratio of the inner fitting end section and is a graph showing a relationship between a radius thickness ratio and a proof stress ratio of the outer fitting end section in the joint structure for a steel pipe pile according to the embodiment.
FIG. 16 is a graph showing a relationship between a ratio of a protruding height of the compressive surface to a protruding height of the tensile surface, and a joint thickness ratio at which tensile proof stress and compressive proof stress equal to those of the steel pipe pile can be acquired, in the same joint structure for a steel pipe pile.
FIG. 17 is a part of a cross-sectional view for describing a relationship between the protruding heights in consideration of a clearance in the same joint structure for a steel pipe pile.
FIG. 18 is a graph showing a result of a bending test in which the protruding height of the tensile surface is varied, in the same joint structure for a steel pipe pile.
FIG. 19 is a graph showing a relationship between a radius thickness ratio and a plate thickness ratio in a joint structure for a steel pipe pile according to a second embodiment of the present invention.
[Embodiments of the Invention] [0018]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to only the embodiments.
[0019] <First Embodiment
A joint structure 7 for a steel pipe pile according to the present embodiment is utilized for a landslide pile, a bearing pile, a friction pile, and the like. As shown in
- 9 FIG. 1, a first steel pipe pile 1 and a second steel pipe pile 2 having a substantially circular cross-sectional shape or the like are coupled to each other in an axial direction Y.
[0020]
The joint structure 7 for a steel pipe pile includes an outer fitting end section 3 and an inner fitting end section 5 which are freely fitted to each other. The outer fitting end section 3 is attached to an end portion of the first steel pipe pile 1 by welding or the like, and the inner fitting end section 5 is attached to an end portion of the second steel pipe pile 2 by welding or the like. In a state where the outer fitting end section 3 and the inner fitting end section 5 share the same axial line L, the outer fitting end section 3 and the inner fitting end section 5 are configured to be a pair facing each other in the axial direction Y parallel to the axial line L.
[0021]
In the joint structure 7 for a steel pipe pile, mainly, outer fitting groove sections 32 are formed inside the outer fitting end section 3, and inner fitting groove sections 52 are formed outside the inner fitting end section 5. The joint structure 7 for a steel pipe pile is applied to a gear joint in which a plurality of outer fitting peak sections 31 and a plurality of inner fitting peak sections 51 are formed on substantially the same circumference in a circumferential direction W. Here, for example, each of the first steel pipe pile 1 and the second steel pipe pile 2 is targeting a steel pipe pile having an outer diameter Dp ranging approximately from 318.5 mm to 1,625.6 mm, and a steel pipe pile having a plate thickness t ranging approximately from 6.0 mm to 30.0 mm.
[0022]
The outer fitting end section 3 has the plurality of outer fitting peak sections
- 10 31 formed to protrude inward in an axial center orthogonal direction X, a plurality of outer fitting groove sections 32 formed to be adjacent to the outer fitting peak sections 31 in the circumferential direction W, and outer fitting valley sections 33 formed on a base end side B of the outer fitting peak sections 31 in the axial direction Y. In the outer fitting end section 3, the outer fitting peak sections 31 and the outer fitting valley sections 33 are formed to be alternately adjacent to each other in the axial direction Y.
[0023]
In the outer fitting end section 3, the outer fitting peak sections 31 and the outer fitting groove sections 32 are alternately formed in the circumferential direction W. The plurality of outer fitting peak sections 31 are disposed substantially in a row in the axial direction Y and the circumferential direction W, and the plurality of outer fitting groove sections 32 are disposed substantially in a row in the axial direction Y and the circumferential direction W. The outer fitting end section 3 is configured to have an outer fitting extra length section 38 as a part which is attached to the end portion of the first steel pipe pile 1 by welding or the like.
[0024]
The inner fitting end section 5 has the plurality of inner fitting peak sections 51 formed to protrude outward in the axial center orthogonal direction X, a plurality of inner fitting groove sections 52 formed to be adjacent to the inner fitting peak sections 51 in the circumferential direction W. and inner fitting valley sections 53 formed on the base end side B of the inner fitting peak sections 51 in the axial direction Y. In the inner fitting end section 5, the inner fitting peak sections 51 and the inner fitting valley sections 53 are formed to be alternately adjacent to each other in the axial direction Y.
[0025]
In the inner fitting end section 5, the inner fitting peak sections 51 and the inner fitting groove sections 52 are alternately formed in the circumferential direction W. The plurality of inner fitting peak sections 51 are disposed substantially in a row in the axial direction Y and the circumferential direction W, and the plurality of inner fitting groove sections 52 are disposed substantially in a row in the axial direction Y and the circumferential direction W. The inner fitting end section 5 is configured to have an inner fitting extra length section 58 as a part which is attached to the end portion of the second steel pipe pile 2 by welding or the like.
[0026]
As shown in FIG 2, the outer fitting peak sections 31 are formed to have a substantially rectangular shape or the like protruding further toward a central axis of the first steel pipe pile I in the axial direction Y than the outer fitting groove sections 32 adjacent to each other in the circumferential direction W, and the outer fitting valley sections 33 adjacent to each other in the axial direction Y. In this case, as shown in FIG 3, the outer fitting peak sections 31 are formed to have predetermined protruding heights He and Ht in the axial center orthogonal direction X respectively from the adjacent outer fitting valley sections 33 on a front end side A and the base end side B in the axial direction Y.
[0027]
In the outer fitting valley sections 33, a plurality of outer fitting stepped sections 4 are respectively provided from the front end side A to the base end side B in the axial direction Y. Each of the outer fitting stepped sections 4 is formed to have a predetermined plate thickness in the axial center orthogonal direction X. In the outer fitting valley sections 33, the outer fitting stepped section 4 farthest to the base end side B in the axial direction Y is formed to be adjacent, in the axial direction Y, to the outer fitting extra length section 38 having a predetermined plate thickness D in the
- 12 axial center orthogonal direction X.
[0028]
In the outer fitting valley sections 33, particularly, the outer fitting stepped section 4 farthest to the front end side A in the axial direction Y becomes a first outer fitting stepped section 41. For example, when the outer fitting stepped sections 4 are provided over four steps in the axial direction Y, the outer fitting valley sections 33 are configured to have the first outer fitting stepped section 41, a second outer fitting stepped section 42, a third outer fitting stepped section 43, and a fourth outer fitting stepped section 44 in order from the front end side A to the base end side B in the axial direction Y.
[0029]
That is, in the outer fitting end section 3, in a case of being seen in a cross section including the axial line L, the outer fitting stepped sections 4 are respectively provided at a plurality of positions along the axial line L on the inner side of the outer fitting end section 3, such that the diameters increase in steps toward the second steel pipe pile 2. Each of the outer fitting stepped sections 4 has the outer fitting peak section 31 relatively close to the second steel pipe pile 2, and the outer fitting valley section 33 adjacent to the outer fitting peak section 31.
In the cross-sectional views of FIGS. 3, 5, 8 to 13, and 16, hatching is omitted to make the drawings easy to see.
[0030]
As shown in FIG 4, the inner fitting peak sections 51 are formed to have a substantially rectangular shape or the like protruding further toward a side opposite to a central axis of the second steel pipe pile 2 in the axial direction Y than the inner fitting groove sections 52 adjacent to each other in the circumferential direction W, and
- 13 the inner fitting valley sections 53 adjacent to each other in the axial direction Y. In this case, as shown in FIG. 5, the inner fitting peak sections 51 are formed to have the predetermined protruding heights He and Ht in the axial center orthogonal direction X respectively from the adjacent inner fitting valley sections 53 on the front end side A and the base end side B in the axial direction Y.
[0031]
In the inner fitting valley sections 53, a plurality of inner fitting stepped sections 6 are respectively provided from the front end side A to the base end side B in the axial direction Y. Each of the inner fitting stepped sections 6 is formed to have a predetermined plate thickness in the axial center orthogonal direction X. In the inner fitting valley sections 53, the inner fitting stepped section 6 farthest to the base end side B in the axial direction Y is formed to be adjacent, in the axial direction Y, to the inner fitting extra length section 58 having the predetermined plate thickness D in the axial center orthogonal direction X. The plate thickness D of the inner fitting extra length section 58 does not necessarily have to coincide with the plate thickness D of the outer fitting extra length section 38.
[0032]
In the inner fitting valley sections 53, particularly, the inner fitting stepped section 6 farthest to the front end side A in the axial direction Y becomes a first inner fitting stepped section 61. For example, when the inner fitting stepped sections 6 are provided over four steps in the axial direction Y, the inner fitting valley sections 53 are configured to have the first inner fitting stepped section 61, a second inner fitting stepped section 62, a third inner fitting stepped section 63, and a fourth inner fitting stepped section 64 in order from the front end side A to the base end side B in the axial direction Y.
- 14 [0033]
That is, in the inner fitting end section 5, in a case of being seen in a cross section along the axial line L, the inner fitting stepped sections 6 are respectively provided at a plurality of positions along the axial line L on the outer side of the inner fitting end section 5, such that the diameters decrease in steps toward the first steel pipe pile 1. Each of the inner fitting stepped sections 6 has the inner fitting peak section 51 relatively close to the first steel pipe pile 1, and the inner fitting valley section 53 adjacent to the inner fitting peak section 51.
[0034]
In the joint structure 7 for a steel pipe pile, as shown in FIGS. 6 and 7, the first steel pipe pile 1 and the second steel pipe pile 2 are configured to be coupled to each other in the axial direction Y by causing the outer fitting end section 3 and the inner fitting end section 5 to be fitted to each other.
[0035]
In the joint structure 7 for a steel pipe pile, first of all, as shown in FIG. 6, the inner fitting end section 5 attached to the second steel pipe pile 2 is inserted into the outer fitting end section 3 attached to the first steel pipe pile 1. In this case, in the joint structure 7 for a steel pipe pile, since the protruding heights of the outer fitting peak sections 31 and the inner fitting peak sections 51 are equal to or smaller than the depths of the inner fitting groove sections 52 and the outer fitting groove sections 32 in the axial center orthogonal direction X, the outer fitting peak sections 31 and the inner fitting peak sections 51 are configured to pass through the inner fitting groove sections 52 and the outer fitting groove sections 32.
[0036]
In the joint structure 7 for a steel pipe pile, next, as shown in FIG. 7, in a state
- 15 where the inner fitting end section 5 is inserted into the outer fitting end section 3, the first steel pipe pile 1 and the second steel pipe pile 2 are relatively rotated in the circumferential direction W around the axial line L. In this case, in the joint structure 7 for a steel pipe pile, since the protruding heights of the outer fitting peak sections 31 and the inner fitting peak sections 51 are equal to or smaller than the depths of the inner fitting valley sections 53 and the outer fitting valley sections 33 in the axial center orthogonal direction X, the outer fitting peak sections 31 and the inner fitting peak sections 51 are configured to be fitted to the inner fitting valley sections 53 and the outer fitting valley sections 33.
[0037]
In the joint structure 7 for a steel pipe pile, the lengths of the outer fitting peak sections 31 in the axial direction Y are caused to be equal to or smaller than the lengths of the inner fitting valley sections 53 in the axial direction Y, and the lengths of the inner fitting peak sections 51 in the axial direction Y are caused to be equal to or smaller than the lengths of the outer fitting valley sections 33 in the axial direction Y. In this case, in the joint structure 7 for a steel pipe pile, in a state where the inner fitting end section 5 inserted into the outer fitting end section 3 is relatively rotated in the circumferential direction W, the outer fitting peak sections 31 and the inner fitting peak sections 51 are configured to be interlocked with each other in the axial direction Y In regard to the outer fitting end section 3 and the inner fitting end section 5, it is preferable to provide 4, 16, or 32 outer fitting peak sections 31 and inner fitting peak sections 51 each in the circumferential direction W.
[0038]
In the joint structure 7 for a steel pipe pile, as shown in FIG. 8, in a state where the outer fitting peak sections 31 and the inner fitting peak sections 51 are
- 16 interlocked with each other, a tensile force Pt acts in a direction in which the first steel pipe pile 1 and the second steel pipe pile 2 are separated from each other in the axial direction Y. In this case, in the outer fitting peak sections 31, the tensile force Pt is transferred from the inner fitting peak sections 51 to tensile surfaces 3 la on the base end side B in the axial direction Y. In addition, at the same time, in the inner fitting peak sections 51, the tensile force Pt is transferred from the tensile surfaces 3 la of the outer fitting peak sections 31 to tensile surfaces 51 a on the base end side B in the axial direction Y.
[0039]
In the joint structure 7 for a steel pipe pile, the tensile surfaces 31a of the outer fitting peak sections 31 and the tensile surfaces 51a of the inner fitting peak sections 51 become the predetermined protruding heights Ht in the axial center orthogonal direction X. In addition, the tensile forces Pt having substantially the same magnitude are transferred to the tensile surfaces 31 a of the outer fitting peak sections 31 and the tensile surfaces 51 a of the inner fitting peak sections 51. In this case, in each of the outer fitting stepped sections 4 and the inner fitting stepped sections 6, a burden rate for the tensile force Pt transferred to each of the outer fitting peak sections 31 and the inner fitting peak sections 51 gradually increases from the front end side A toward the base end side B in the axial direction Y. As a result, the burden rate for the tensile force Pt becomes the maximum in the fourth outer fitting stepped section 44 and the fourth inner fitting stepped section 64 farthest to the base end side B.
[0040]
In addition, in the joint structure 7 for a steel pipe pile, as shown in FIG. 9, in a state where the outer fitting peak sections 31 and the inner fitting peak sections 51
- 17 are interlocked with each other, a compressive force Pc acts in a direction in which the first steel pipe pile 1 and the second steel pipe pile 2 approach each other in the axial direction Y. In this case, in the outer fitting peak sections 31, the compressive force Pc is transferred from the inner fitting peak sections 51 to compressive surfaces 31b on the front end side A in the axial direction Y. In addition, at the same time, in the inner fitting peak sections 51, the compressive force Pc is transferred from the compressive surfaces 31b of the outer fitting peak sections 31 to compressive surfaces 51b on the front end side A in the axial direction Y.
[0041]
In the joint structure 7 for a steel pipe pile, the compressive surfaces 31b of the outer fitting peak sections 31 and the compressive surfaces 51b of the inner fitting peak sections 51 become the predetermined protruding heights He in the axial center orthogonal direction X. In addition, the compressive forces Pc having substantially the same magnitude are transferred to the compressive surfaces 31b of the outer fitting peak sections 31 and the compressive surfaces 51b of the inner fitting peak sections 51. In this case, in each of the outer fitting stepped sections 4 and the inner fitting stepped sections 6, a burden rate for the compressive force Pc transferred to each of the outer fitting peak sections 31 and the inner fitting peak sections 51 gradually increases from the front end side A toward the base end side B in the axial direction Y. As a result, the burden rate for the compressive force Pc becomes the maximum in the fourth outer fitting stepped section 44 and the fourth inner fitting stepped section 64 farthest to the base end side B.
[0042]
In the joint structure 7 for a steel pipe pile according to the present embodiment, as shown in FIG 10, the outer fitting valley sections 33 and the inner
- 18 fitting valley sections 53 are formed to have the predetermined plate thicknesses in the axial center orthogonal direction X respectively in the outer fitting stepped sections 4 and the inner fitting stepped sections 6.
[0043]
In the outer fitting valley sections 33, the outer fitting valley section 33 in the first outer fitting stepped section 41 has a plate thickness tbi, the outer fitting valley section 33 in the second outer fitting stepped section 42 has a plate thickness tb2, the outer fitting valley section 33 in the third outer fitting stepped section 43 has a plate thickness tb3, and the outer fitting valley section 33 in the fourth outer fitting stepped section 44 has a plate thickness tb4. In the outer fitting valley sections 33, particularly, of the outer fitting stepped sections 4 adjacent to each other in the axial direction Y, the plate thickness of the outer fitting valley section 33 in the outer fitting stepped section 4 on the base end side B in the axial direction Y is configured to be greater than the plate thickness of the outer fitting valley section 33 in the outer fitting stepped section 4 on the front end side A in the axial direction Y.
[0044]
In this case, when the outer fitting stepped sections 4 are provided over four steps from the front end side A to the base end side B in the axial direction Y, in the outer fitting valley sections 33, the plate thickness tb2 in the second outer fitting stepped section 42 becomes greater than the plate thickness tbi in the first outer fitting stepped section 41. In addition, in the outer fitting valley sections 33, the plate thickness tb3 in the third outer fitting stepped section 43 is configured to be greater than the plate thickness tb2 in the second outer fitting stepped section 42, and the plate thickness tb4 in the fourth outer fitting stepped section 44 is configured to be greater than the plate thickness tb3 in the third outer fitting stepped section 43.
- 19 [0045]
In the inner fitting valley sections 53, the inner fitting valley section 53 in the first inner fitting stepped section 61 has a plate thickness tpl, the inner fitting valley section 53 in the second inner fitting stepped section 62 has a plate thickness tp2, the inner fitting valley section 53 in the third inner fitting stepped section 63 has a plate thickness tp3, and the inner fitting valley section 53 in the fourth inner fitting stepped section 64 has a plate thickness tp4. In the inner fitting valley sections 53, particularly, of the inner fitting stepped sections 6 adjacent to each other in the axial direction Y, the plate thickness of the inner fitting valley section 53 in the inner fitting stepped section 6 on the base end side B in the axial direction Y is configured to be greater than the plate thickness of the inner fitting valley section 53 in the inner fitting stepped sections 6 on the front end side A in the axial direction Y.
[0046]
In this case, when the inner fitting stepped sections 6 are provided over four steps from the front end side A to the base end side B in the axial direction Y, in the inner fitting valley sections 53, the plate thickness tp2 in the second inner fitting stepped section 62 becomes greater than the plate thickness tpl in the first inner fitting stepped section 61. In addition, in the inner fitting valley sections 53, the plate thickness tp3 in the third inner fitting stepped section 63 is configured to be greater than the plate thickness tp2 in the second inner fitting stepped section 62, and the plate thickness tp4 in the fourth inner fitting stepped section 64 is configured to be greater than the plate thickness tp3 in the third inner fitting stepped section 63.
[0047]
In the joint structure 7 for a steel pipe pile, in a state where the outer fitting end section 3 and the inner fitting end section 5 are relatively rotated, the outer fitting
- 20 stepped sections 4 and the inner fitting stepped sections 6 are respectively disposed at positions corresponding to each other in the axial direction Y. In the outer fitting valley sections 33 and the inner fitting valley sections 53, the outer fitting peak sections 31 and the inner fitting peak sections 51 are interlocked with each other in the axial direction Y in the outer fitting stepped sections 4 and the inner fitting stepped sections 6 disposed at positions corresponding to each other.
[0048]
In this case, in the outer fitting valley sections 33 and the inner fitting valley sections 53, the outer fitting peak section 31 of the first outer fitting stepped section 41 and the inner fitting peak section 51 of the fourth inner fitting stepped section 64 are interlocked with each other, and the outer fitting peak section 31 of the second outer fitting stepped section 42 and the inner fitting peak section 51 of the third inner fitting stepped section 63 are interlocked with each other. In addition, in the outer fitting valley sections 33 and the inner fitting valley sections 53, the outer fitting peak section 31 of the third outer fitting stepped section 43 and the inner fitting peak section 51 of the second inner fitting stepped section 62 are interlocked with each other, and the outer fitting peak section 31 of the fourth outer fitting stepped section 44 and the inner fitting peak section 51 of the first inner fitting stepped section 61 are interlocked with each other.
[0049]
In the joint structure 7 for a steel pipe pile, particularly, the plate thickness tbl of the outer fitting valley section 33 in the first outer fitting stepped section 41 is smaller than the plate thickness tpl of the inner fitting valley section 53 in the first inner fitting stepped section 61. In addition, the plate thickness tb2 of the outer fitting valley section 33 in the second outer fitting stepped section 42 is smaller than the plate thickness tp2 of the inner fitting valley section 53 in the second inner fitting stepped section 62. In addition, the plate thickness tb3 of the outer fitting valley section 33 in the third outer fitting stepped section 43 is smaller than the plate thickness ΐρ3 of the inner fitting valley section 53 in the third inner fitting stepped section 63. In addition, the plate thickness tb4 of the outer fitting valley section 33 in the fourth outer fitting stepped section 44 is smaller than the plate thickness tp4 of the inner fitting valley section 53 in the fourth inner fitting stepped section 64.
[0050]
In addition, while having a difference Ab between the plate thicknesses of the outer fitting valley sections 33 adjacent to each other in the axial direction Y in the outer fitting stepped sections 4, and a difference Ap between the plate thicknesses of the inner fitting valley sections 53 adjacent to each other in the axial direction Y in the inner fitting stepped sections 6, the joint structure 7 for a steel pipe pile is characterized in that the outer fitting valley sections 33 and the inner fitting valley sections 53 can be fitted to each other by causing Ab 1 =(tb2-tb I) and Ap3=(tp4-tp3) to be substantially the same as each other, causing Ab2=(tb3-tb2) and Ap2=(tp3-tp2) to be substantially the same as each other, and causing Ab3=(tb4-tb3) and Δρ 1 =(tp2-tp 1) to be substantially the same as each other. Therefore, the joint structure 7 for a steel pipe pile is characterized in that all of tbi, tb2, tb3, tb4, tpl, tp2, tp3, and tp4 can be drawn out by determining the plate thickness tpl, and a plate thickness ratio (tbl/tpl) which is a ratio of the plate thickness tbi to the plate thickness tpl.
[0051]
For example, in a joint structure 9 for a steel pipe pile in the related art disclosed in Patent Document 2, as shown in FIG 11, the plate thickness tbi is the same as the plate thickness tpl, the plate thickness tb2 is the same as the plate
- 22 thickness tp2, the plate thickness tb3 is the same as the plate thickness tp3, and the plate thickness tb4 is the same as the plate thickness tp4. Therefore, in the joint structure 9 for a steel pipe pile in the related art, in a case where the first inner fitting stepped section 61 and the first outer fitting stepped section 41 are compared to each other, the first inner fitting stepped section 61 present on the inner side in a radial direction has a small cross-sectional area. In addition, similarly in the second inner fitting stepped section 62, the third inner fitting stepped section 63, and the fourth inner fitting stepped section 64, the inner fitting stepped sections 6 have a cross-sectional area smaller than that of the outer fitting stepped sections 4. Consequently, the inner fitting end section 5 has a cross-sectional area smaller than that of the outer fitting end section 3. Therefore, in the joint structure 9 for a steel pipe pile in the related art, proof stress of the inner fitting end section 5 and the outer fitting end section 3 is determined based on fracture of the inner fitting end section 5 having a small crosssectional area, thereby having a disadvantage of excessive design of the outer fitting end section 3.
[0052]
In addition, when a tensile force acts, the outer fitting end section 3 is generally deformed to expand outward in the axial center orthogonal direction X toward a side opposite to the central axis of the first steel pipe pile 1 in the axial direction Y. On the other hand, the inner fitting end section 5 is generally deformed to contract inward in the axial center orthogonal direction X toward the central axis of the second steel pipe pile 2 in the axial direction Y. Therefore, in a case of considering the spread of stress in the circumferential direction when a tensile force acts, the inner fitting end section 5 is deformed to contract inward so that stress is unlikely to spread in the circumferential direction. On the other hand, the outer fitting
- 23 end section 3 is deformed to expand outward so that stress is likely to spread in the circumferential direction, and stress concentration in the outer fitting end section 3 is relaxed. Therefore, in addition to the viewpoint of the cross-sectional area, the joint structure 9 for a steel pipe pile in the related art has a disadvantage of excessive design of the outer fitting end section 3 from a viewpoint of the spread of stress in the circumferential direction and the relaxation of stress concentration.
[0053]
In contrast, in the joint structure 7 for a steel pipe pile according to the present embodiment, as shown in FIG 10, the plate thickness tbl of the outer fitting valley section 33 in the first outer fitting stepped section 41 is set to be smaller than the plate thickness tpl of the inner fitting valley section 53 in the first inner fitting stepped section 61, and the plate thickness ratio (tbl/tpl) which is a ratio of the plate thickness tbl to the plate thickness tpl is caused to be equal to or greater than 0.84.
That is, in the joint structure 7 for a steel pipe pile according to the present embodiment, the plate thickness of the outer fitting valley section 33 closest to the second steel pipe pile 2 is smaller than the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile 1, and a ratio obtained by dividing the plate thickness of the outer fitting valley section 33 closest to the second steel pipe pile 2 by the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile I is equal to or greater than 0.84.
[0054]
In addition, in the joint structure 7 for a steel pipe pile, the size of the plate thickness tp 1 is determined by causing Ab l=(tb2-tb 1) and Ap3=(tp4-tp3) to be substantially the same as each other, causing Ab2=(tb3-tb2) and Ap2=(tp3-tp2) to be substantially the same as each other, and causing Ab3=(tb4-tb3) and Apl=(tp2-tpl) to
- 24 be substantially the same as each other. Moreover, the plate thickness of the outer fitting valley section 33 closest to the second steel pipe pile 2 is smaller than the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile 1, and a ratio obtained by dividing the plate thickness of the outer fitting valley section 33 closest to the second steel pipe pile 2 by the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile 1 is caused to be equal to or greater than 0.84. Accordingly, the cross-sectional area of the outer fitting end section 3 can be designed based on fracture of the inner fitting end section 5 having a small crosssectional area. Accordingly, in the joint structure 7 for a steel pipe pile, the outer fitting end section 3 can be designed to have a small cross-sectional area in accordance with the inner fitting end section 5 having a small cross-sectional area. Accordingly, excessive design of the outer fitting end section 3 is avoided, and the plate thickness of the outer fitting end section 3 can be reduced compared to the joint structure 9 for a steel pipe pile in the related art.
[0055]
As shown in FIG. 12, the shapes of the outer fitting extra length section 38 and the inner fitting extra length section 58 may be deformed. In such shapes, the joint structure 7 for a steel pipe pile can be reduced in weight.
Here, as shown in (a) of FIG. 13, in the joint structure 7 for a steel pipe pile according to the present embodiment, the plate thickness of the outer fitting valley section 33 closest to the second steel pipe pile 2 is smaller than the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile 1. In contrast, in the joint structure 9 for a steel pipe pile in the related art as shown in (b) of FIG. 13, the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile 1 and the plate thickness of the outer fitting valley section 33 closest to the second steel
- 25 pipe pile 2 are the same as each other. The drawing (c) of FIG. 13 is a view showing a comparison between (a) of FIG 13 and (b) of FIG. 13. In (c) of FIG. 13, the joint structure 9 for a steel pipe pile in the related art in (b) of FIG 13 is indicated with a dotted line. According to the drawing, it is ascertained that the thickness of the outer fitting end section 3 in its entirety is reduced particularly in the joint structure 7 for a steel pipe pile according to the present embodiment.
[0056]
Here, FIG 14 shows numerical analysis and an experimental result of proof stress of a joint corresponding to a steel pipe pile to be joined, in the joint structure for a steel pipe pile according to the present embodiment. The shape ratio according to the present embodiment is applied to grant a design safety factor in design. In order to obtain proof stress of the joint, the steel pipe pile is calculated as a material of a perfect elastic body in the numerical analysis. In addition, a steel pipe having strength stronger than a steel pipe corresponding to the original joint is used in the experiment such that the joint fractures in advance.
As a range for the steel pipe pile to which the joint was applied, the outer diameter Dp ranged from 400.0 mm to 1,600.0 mm, and the plate thickness tp of the steel pipe pile ranged from 6.0 mm to 30.0 mm. SKK40 stipulated in JIS A 5525 and SM570 stipulated in JIS G 3106 were employed as material standards. In the graph of FIG 14, the horizontal axis indicates a radius thickness ratio (Dp/tp) of the outer diameter Dp to the plate thickness tp of the steel pipe pile to be joined, and the vertical axis indicates a ratio (Mmax/Mp) of a maximum bending moment Mmax (joint part) and full plastic bending moment Mp of a steel pipe pile (steel pipe part) of the joint structure 7 for a steel pipe pile according to the present embodiment calculated by FEM analysis. From FIG. 14, it is ascertained that the maximum bending moment
- 26 Mmax of the joint exceeds full plastic bending moment Mp of the steel pipe to be joined even in a case where the plate thickness tb of the outer fitting end section 3 is reduced. In addition, it is ascertained that since the joint is stronger than the steel pipe, this joint does not fracture prior to the steel pipe. Table 1 shows numeric data of FIG 14.
[0057] [Table 1]
| No. | DP (mm) | tp (mm) | Dp/tp | Kinds of steel | Mmax (kN · m) | Mp (kN in) | Mmax/Mp | |
| Numerical analysis | 1 | 400.0 | 6.0 | 66.67 | SKK400 | 513 | 219 | 2.35 |
| 2 | 400.0 | 30.0 | 13.33 | SM570 | 3125 | 1852 | 1.69 | |
| 3 | 800.0 | 9.0 | 88.89 | SKK400 | 2415 | 1323 | 1.83 | |
| 4 | 800.0 | 16.0 | 50.00 | SKK490 | 5552 | 3098 | 1.79 | |
| 5 | 800.0 | 24.0 | 33.33 | SKK490 | 8523 | 4554 | 1.87 | |
| 6 | 1219.2 | 30.0 | 40.64 | SKK490 | 24517 | 13367 | 1.83 | |
| 7 | 1600.0 | 16.0 | 100.00 | SKK400 | 15541 | 9434 | 1.65 | |
| 8 | 1600.0 | 19.0 | 84.21 | SKK400 | 20724 | 11161 | 1.86 | |
| 9 | 1600.0 | 25.0 | 64.00 | SKK490 | 33248 | 19537 | 1.70 | |
| 10 | 1600.0 | 30.0 | 53.33 | SM570 | 59571 | 33280 | 1.79 | |
| Numerical analysis (analysis of reproduced experiment) | 11 | 800.0 | 9.0 | 88.89 | SKK400 | 2287 | 1323 | 1.73 |
| 12 | 800.0 | 9.0 | 88.89 | SKK400 | 2305 | 1323 | 1.74 | |
| 13 | 800.0 | 13.0 | 61.54 | SKK400 | 3507 | 1892 | 1.85 | |
| Experiment | 14 | 800.0 | 9.0 | 88.89 | SKK400 | 2083 | 1323 | 1.57 |
| 15 | 800.0 | 9.0 | 88.89 | SKK400 | 2242 | 1323 | 1.69 | |
| 16 | 800.0 | 13.0 | 61.54 | SKK400 | 3090 | 1892 | 1.63 |
[0058]
FIGS. 15A and 15B show bases for a difference between the plate thicknesses of the outer fitting valley sections 33 and the inner fitting valley sections 53. In FIG
- 27 15A, the horizontal axis indicates a radius thickness ratio (Dp/tpl) of the outer diameter Dp of the steel pipe pile to the plate thickness tpl of the inner fitting valley section 53 in the first inner fitting stepped section 61. In addition, in FIG 15A, the vertical axis indicates a proof stress ratio (Mmax/Mf) of the maximum bending moment Mmax of the joint structure 7 for a steel pipe pile according to the present embodiment calculated by the FEM analysis to a full plastic bending moment Mf of the inner fitting valley section 53 (in a case where the whole circumference of the valley section of the joint is effective). In FIG. 15B, the horizontal axis indicates a radius thickness ratio (Dp/tbl) of the outer diameter Dp of the steel pipe pile to the plate thickness tbl of the outer fitting valley section 33 in the first outer fitting stepped section 41. In FIG. 15B, the vertical axis indicates the proof stress ratio (Mmax/Mf) of the maximum bending moment Mmax of the present invention calculated by the FEM analysis to a full plastic bending moment Mf of the outer fitting valley section 33.
According to FIG. 15A, it is ascertained that in the inner fitting end section 5, in a case where the radius thickness ratio changes, the proof stress ratio also changes, so that the proof stress ratio becomes a linear function of the radius thickness ratio. In contrast, according to FIG. 15B, in the outer fitting valley sections 33, the proof stress ratio becomes constant without depending on the radius thickness ratio. In FIGS. 15A and 15B as well, as the range, the outer diameter Dp of the steel pipe pile ranged from 400.0 mm to 1,600.0 mm, and the plate thickness t of the steel pipe pile ranged from 6.0 mm to 30.0 mm. SKK400 stipulated in JIS A 5525 was indicated as the lower limit value for ordinary material standards of the steel pipe pile, and SM570 stipulated in JIS G 3106 was indicated as the upper limit value for material standards. Table 2 shows numeric data of FIGS. 15A and 15B.
- 28 [0059] [Table 2]
| No. | Dp (m) | Plate thickness t (tpl ortbl) (mm) | Kinds of steel | Dp/t | Mmax (kN-m) | Mf (kN-m) | Mmax/Mf | |
| Experiment (fracture of joint) | 1 | 800.0 | 7.2 | SKK490 | 111.11 | 2242 | 3000 | 0.75 |
| 2 | 800.0 | 9.5 | SKK490 | 84.21 | 3090 | 4178 | 0.74 | |
| Numerical analysis of inner fitting end section (fracture of joint) | 3 | 400.0 | 4.3 | SK.K400 | 93.02 | 513 | 435 | 1.18 |
| 4 | 400.0 | 33.1 | SM570 | 12.08 | 3093 | 2871 | 1.08 | |
| 5 | 800.0 | 6.3 | SKK400 | 126.98 | 2416 | 2697 | 0.90 | |
| 6 | 800.0 | 13.0 | SKK490 | 61.54 | 5565 | 5606 | 0.99 | |
| 7 | 800.0 | 19.5 | SKK.490 | 41.03 | 8782 | 7850 | 1.12 | |
| 8 | 1219.2 | 24.5 | SKK.490 | 49.76 | 26653 | 23499 | 1.13 | |
| 9 | 1600.0 | 11.7 | SKK400 | 136.75 | 15541 | 18990 | 0.82 | |
| 10 | 1600.0 | 13.1 | SKK400 | 122.14 | 20723 | 22609 | 0.92 | |
| II | 1600.0 | 21.2 | SKK490 | 75.47 | 33674 | 36431 | 0.92 | |
| 12 | 1600.0 | 35.0 | SM570 | 45.71 | 59571 | 60102 | 0.99 | |
| Numerical analysis of outer fitting end section (fracture of joint) | 13 | 400.0 | 3.8 | SK.K400 | 105.26 | 513 | 371 | 1.38 |
| 14 | 400.0 | 32.6 | SM570 | 12.27 | 3093 | 2835 | 1.09 | |
| 15 | 800.0 | 5.4 | SKK400 | 148.15 | 2416 | 2242 | 1.08 | |
| 16 | 800.0 | 12.1 | SKK.490 | 66.12 | 5565 | 5189 | 1.07 | |
| 17 | 800.0 | 18.6 | SKK490 | 43.01 | 8782 | 7496 | 1.17 | |
| 18 | 1219.2 | 23.0 | SKK490 | 53.01 | 26653 | 22095 | 1.21 | |
| 19 | 1600.0 | 9.8 | SKK400 | 163.27 | 15541 | 15251 | 1.02 | |
| 20 | 1600.0 | 11.2 | SKK400 | 142.86 | 20723 | 18824 | 1.10 | |
| 21 | 1600.0 | 19.3 | SKK490 | 82.90 | 33674 | 32773 | 1.03 | |
| 22 | 1600.0 | 32.8 | SM570 | 48.78 | 59571 | 55893 | 1.07 | |
| Experiment of inner fitting end section (fracture of steel pipe) | 23 | 400.0 | 4.3 | SKK400 | 93.02 | 308 | 433 | 0.71 |
| 24 | 800.0 | 13.0 | SKK490 | 61.54 | 4718 | 5611 | 0.84 | |
| 25 | 800.0 | 19.5 | SKK490 | 41.03 | 5518 | 7874 | 0.70 | |
| 26 | 1600.0 | 13.1 | SKK400 | 122.14 | 14341 | 22631 | 0.63 | |
| Experiment of outer fitting end section (fracture of steel pipe) | 27 | 400.0 | 3.8 | SKK400 | 105.26 | 308 | 372 | 0.83 |
| 28 | 800.0 | 12.0 | SKK490 | 66.67 | 4718 | 5121 | 0.92 | |
| 29 | 800.0 | 18.6 | SKK490 | 43.01 | 5518 | 7480 | 0.74 | |
| 30 | 1600.0 | 11.2 | SKK400 | 142.86 | 14341 | 18741 | 0.77 |
[0060]
Here, in the joint structure 7 for a steel pipe pile, the outer fitting end section 3 and the inner fitting end section 5 are formed to have a substantially circular crosssectional shape. Therefore, the cross-sectional area of the outer fitting valley section
- 29 33 becomes (πχΛ13-πχΑ22) by subtracting n><rb22 calculated based on an inner diameter rb2 of the outer fitting valley section 33 from Ttorbl calculated based on an outer diameter rbl of the outer fitting valley section 33, in each of the outer fitting stepped sections 4. Then, since the inner diameter rb2 of the outer fitting valley section 33 is obtained by subtracting the plate thickness tb from the outer diameter rbl of the outer fitting valley section 33, the cross-sectional area of the outer fitting valley section 33 has a proportional relationship with the square of a plate thickness tb of the outer fitting valley section 33. Moreover, similar to the cross-sectional area of the outer fitting valley section 33, the cross-sectional area of the inner fitting valley section 53 also has a proportional relationship with the square of the plate thickness tp of the inner fitting valley section 53 in the inner fitting stepped section 6.
[0061]
In the joint structure 7 for a steel pipe pile, as shown in FIG. 15 A, in the inner fitting end section 5, since a bending moment ratio is reduced from 0.70 to 0.50 within a range of the radius thickness ratio from 10.00 to 200.00, it is assumed that 70% to 50% of the whole circumference of the inner fitting valley section 53 is an effective cross section. In contrast, in the outer fitting end section 3, as shown in FIG. 15B, the bending moment ratio becomes constant without depending on the radius thickness ratio, and it is assumed that 70% of the whole circumference of the outer fitting valley section 33 is an effective cross section.
Consequently, if design is performed based on fracture of the inner fitting valley section 53 within a range in which the radius thickness ratio becomes 200.00, the cross-sectional area of the outer fitting valley section 33 can be reduced to 71% (0.50/0.70-0.71). Therefore, since the cross-sectional area of the outer fitting valley section 33 has a proportional relationship with the square of the plate thickness tb of
- 30 the outer fitting valley section 33, even if the plate thickness tb of the outer fitting valley section 33 is reduced to 0.84 times the plate thickness tp of the inner fitting valley section 53 (0.842~0.71), it is possible to ensure the cross-sectional area equal to or greater than that of the inner fitting valley section 53. Thus, equal proof stress can be ensured in the outer fitting valley sections 33 and the inner fitting valley sections 53. In the radius thickness ratio of approximately 50, if design is performed based on fracture of the inner fitting valley section 53, the cross-sectional area of the outer fitting valley section 33 can be reduced to 97% (0.68/0.70-0.97). Therefore, since the cross-sectional area of the outer fitting valley section 33 has a proportional relationship with the square of the plate thickness tb of the outer fitting valley section 33, even if the plate thickness tb of the outer fitting valley section 33 is reduced to 0.94 times the plate thickness tp of the inner fitting valley section 53 (0.972~0.94), it is possible to ensure the cross-sectional area equal to or greater than that of the inner fitting valley section 53.
[0062]
In this manner, in the joint structure 7 for a steel pipe pile according to the present embodiment, in each of the outer fitting stepped sections 4 and the inner fitting stepped sections 6, the plate thickness tb of the outer fitting valley section 33 is smaller than the plate thickness tp of the inner fitting valley section 53. In the joint structure 7 for a steel pipe pile according to the present embodiment, the plate thickness of the outer fitting valley section 33 closest to the second steel pipe pile 2 is smaller than the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile 1, and a ratio obtained by dividing the plate thickness of the outer fitting valley section 33 closest to the second steel pipe pile 2 by the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile 1 is equal to or greater than 0.84.
- 31 Accordingly, in the joint structure 7 for a steel pipe pile, compared to the joint structure 9 for a steel pipe pile in the related art, excessive design can be avoided by reducing the cross-sectional area of the outer fitting end section 3. Accordingly, the maximum proof stress for compression, tension, and bending can be acquired with a small used amount of a steel or the like in weight and cubic volume. As a result, efficiency of coupling work can be improved by reducing the weight and the cubic volume of a joint in its entirety, and a rise of material cost of the joint in its entirety can be suppressed.
[0063]
In addition, in the joint structure 7 for a steel pipe pile according to the present embodiment, as shown in FIGS. 8 and 9, of the outer fitting stepped sections 4 adjacent to each other in the axial direction Y, the plate thickness of the outer fitting valley section 33 in the outer fitting stepped section 4 on the base end side B is configured to be greater than the plate thickness of the outer fitting valley section 33 in the outer fitting stepped section 4 on the front end side A. Along with this, of the inner fitting stepped sections 6 adjacent to each other in the axial direction Y, the plate thickness of the inner fitting valley section 53 in the inner fitting stepped section 6 on the base end side B is configured to be greater than the plate thickness of the inner fitting valley section 53 in the inner fitting stepped section 6 on the front end side A. In addition, the protruding heights He of the compressive surfaces 3 lb of the outer fitting peak sections 31 and the compressive surfaces 51b of the inner fitting peak sections 51 are configured to be greater than the protruding heights Ht of the tensile surfaces 3 la of the outer fitting peak sections 31 and the tensile surfaces 51a of the inner fitting peak sections 51.
Moreover, in the first outer fitting stepped section 41 and the first inner fitting stepped section 61, the protruding heights He of the compressive surfaces 3 lb of the
- 32 outer fitting peak sections 31 and the compressive surfaces 51b of the inner fitting peak sections 51 are greater than those of the second outer fitting stepped section 42 to the fourth outer fitting stepped section 44 and the second inner fitting stepped section 62 to the fourth inner fitting stepped section 64. Accordingly, each of the outer fitting end section 3 and the inner fitting end section 5 is characterized in that compressive proof stress is greater than tensile proof stress.
[0064]
In contrast, for example, in the joint structure 9 for a steel pipe pile in the related art disclosed in Patent Document 2, as shown in FIG. 11, a ratio of He to Ht becomes Ht<0.5*Hc, and He becomes extremely significant compared to Ht. Therefore, in the joint structure 9 for a steel pipe pile in the related art, if calculation is performed based on the ratio of the protruding heights He of the compressive surfaces 31b to the compressive surfaces 51b, and the protruding heights Fit of the tensile surfaces 31 a and the tensile surfaces 51 a, compressive proof stress exceeds twice tensile proof stress. Therefore, in the joint structure 9 for a steel pipe pile in the related art, in a case where tensile proof stress of the joint in its entirety is caused to be equal to or greater than that of the steel pipe pile, compressive proof stress of the joint in its entirety exceeds twice the steel pipe pile. Since tensile proof stress and compressive proof stress are the same as each other in general steel pipe piles, the joint structure 9 for a steel pipe pile in the related art has a disadvantage of excessive design of compressive proof stress.
[0065]
In the joint structure 7 for a steel pipe pile according to the present embodiment, as shown in FIGS. 8 and 9, in each of the outer fitting stepped sections 4 and the inner fitting stepped sections 6, the ratio of the protruding heights Ht of the
- 33 tensile surfaces 31a to the tensile surfaces 51a in the outer fitting peak sections 31 and the inner fitting peak sections 51 to the protruding heights He of the compressive surfaces 31b and the compressive surfaces 51b in the outer fitting peak sections 31 and the inner fitting peak sections 51 ranges from 0.5 to 0.9. In this case, in the joint structure 7 for a steel pipe pile, the protruding heights Ht become smaller than the protruding heights He, and each of the outer fitting stepped sections 4 and the inner fitting stepped sections 6 is formed in a substantially tapered shape in the axial direction Y from the front end side A to the base end side B in the axial direction. Accordingly, in the joint structure 7 for a steel pipe pile, the protruding heights Ht can be reduced until tensile proof stress of the joint in its entirety becomes equal to compressive proof stress by causing the protruding heights Ht to be smaller than the protruding heights He. Accordingly, since excessive design of compressive proof stress can be suppressed, compared to the joint structure 9 for a steel pipe pile in the related art, the steel weight of the joint in its entirety can be reduced.
[0066]
Here, FIG. 16 shows a result of a comparison between joint thickness ratios of the joint structure 7 for a steel pipe pile according to the present embodiment to the joint structure 9 for a steel pipe pile in the related art. In FIG. 16, the horizontal axis indicates a ratio (Ht/Hc) of He and Ht, and the vertical axis indicates a joint thickness ratio at which tensile proof stress and compressive proof stress equal to those of the steel pipe pile in the related art can be acquired when the ratio of He to Ht is changed.
[0067]
In FIG. 16, in a case where Ht=0.5xHc is set (corresponds to the examples of 2, 9, and 16 in Table 3) and the joint thickness ratio at the time of tensile proof stress and compressive proof stress equal to those of the steel pipe pile in the related art is set
- 34 as a reference value, the value of the joint thickness ratio in the vertical axis becomes
1. As the joint thickness, the total value of h (corresponds to D in FIG. 5), the plate thickness tp4 of the inner fitting valley section 53 in the fourth inner fitting stepped section 64, the plate thickness tbl of the outer fitting valley section 33 in the first outer fitting stepped section 41, and a predetermined clearance CL is employed.
[0068]
In FIG. 16, SKK400 and SKK490 stipulated in JIS A 5525 were indicated as the lower limit values for ordinary material standards of the steel pipe pile, and SM570 stipulated in JIS G 3106 was indicated as the upper limit value for material standards. Table 3 shows numeric data of FIG. 16.
- 35 [0069] [Table 3]
| No. | Ht/Hc | Dp (mm) | h (mm) | tp4 (mm) | tbl (mtn) | CL (mm) | Joint thickness ratio | |
| SKK400 | I | 0.4 | 1600.0 | 7.7 | 54.0 | 17,4 | 0.9 | 1.17 |
| 2 | 0.5 | 1600.0 | 7.7 | 42.4 | 17.4 | 0.9 | 1.00 | |
| 3 | 0.6 | 1600.0 | 7.7 | 34.7 | 17.4 | 0.9 | 0.89 | |
| 4 | 0.7 | 1600.0 | 7.7 | 31.4 | 19.4 | 0.9 | 0.87 | |
| 5 | 0.8 | 1600.0 | 7.7 | 31.4 | 23.5 | 0.9 | 0.93 | |
| 6 | 0.9 | 1600.0 | 7.7 | 31.4 | 26.7 | 0.9 | 0.97 | |
| 7 | 1.0 | 1600.0 | 7.7 | 31.4 | 29.3 | 0.9 | 1.01 | |
| SKK490 | 8 | 0.4 | 1600.0 | 9.8 | 69.1 | 23.1 | 0.9 | 1.17 |
| 9 | 0.5 | 1600.0 | 9.8 | 54.4 | 23.1 | 0.9 | 1.00 | |
| 10 | 0.6 | 1600.0 | 9.8 | 44.6 | 23.1 | 0.9 | 0.89 | |
| 11 | 0.7 | 1600.0 | 9.8 | 41.2 | 26.5 | 0.9 | 0.89 | |
| 12 | 0.8 | 1600.0 | 9.8 | 41.2 | 31.7 | 0.9 | 0.95 | |
| 13 | 0.9 | 1600.0 | 9.8 | 41.2 | 35.8 | 0.9 | 0.99 | |
| 14 | 1.0 | 1600.0 | 9.8 | 41.2 | 39.1 | 0.9 | 1.03 | |
| SM570 | 15 | 0.4 | 1600.0 | 13.4 | 95.0 | 32.8 | 0.9 | 1.16 |
| 16 | 0.5 | 1600.0 | 13.4 | 74.9 | 32.8 | 0.9 | 1.00 | |
| 17 | 0.6 | 1600.0 | 13.4 | 61.5 | 32.8 | 0.9 | 0.89 | |
| 18 | 0.7 | 1600.0 | 13.4 | 57.7 | 38,4 | 0.9 | 0.91 | |
| 19 | 0.8 | 1600.0 | 13.4 | 57.8 | 45.6 | 0.9 | 0.96 | |
| 20 | 0.9 | 1600.0 | 13.4 | 57.8 | 51.1 | 0.9 | 1.01 | |
| 21 | 1.0 | 1600.0 | 13.4 | 57.7 | 55.6 | 0.9 | 1.05 |
[0070]
In the joint structure 7 for a steel pipe pile, as shown in FIG. 16, in SKK400,
SKK490, or SM57O, particularly within a range of 0.5xHc<Ht<0.9xHc, the joint thickness ratio becomes small compared to the joint structure 9 for a steel pipe pile in the related art. Accordingly, it is ascertained that the weight of the joint in its entirety
- 36 is reduced. Moreover, in the joint structure 7 for a steel pipe pile, if design is performed within a range of 0.55*Hc<Ht<0.8*Hc, approximately 5.0% of the joint thickness ratio can be reduced compared to the joint structure 9 for a steel pipe pile in the related art. As a result, approximately 3.5% to 4.0% of the weight of the joint in its entirety after processing can be reduced.
[0071]
In the joint structure 7 for a steel pipe pile, in SKK400 or SKK490, if design is performed within a range of 0.6*1Ic<Ht<0.8*Hc, approximately 10% of the joint thickness ratio can be reduced. Along with this, in SM570, if design is performed within a range of 0.6*Hc<Ht<0.7*Hc, approximately 10% of the joint thickness ratio can be reduced.
Accordingly, in the joint structure 7 for a steel pipe pile, excessive design of compressive proof stress can be avoided by causing the ratio of the protruding height Ht to the protruding height He to range from 0.5 to 0.9 and reducing the protruding height He. Accordingly, compared to the joint structure 9 for a steel pipe pile in the related art, the maximum proof stress for compression, tension, and bending can be acquired with a small used amount of a steel or the like in weight and cubic volume. As a result, efficiency of coupling work can be improved by reducing the weight and the cubic volume of a joint in its entirety, and a rise of material cost of the joint in its entirety can be suppressed.
[0072]
In the joint structure 7 for a steel pipe pile according to the present embodiment, in each of the outer fitting peak sections 31, a ratio obtained by dividing the protruding height Ht of a different outer fitting peak section 31 next to the outer fitting peak section 31 relatively close to the second steel pipe pile 2 by the protruding
- 37 height He of the outer fitting peak section 31 relatively close to the second steel pipe pile 2 ranges from 0.5 to 0.9. In each of the inner fitting peak sections 51, a ratio obtained by dividing the protruding height Ht of a different inner fitting peak section 51 next to the inner fitting peak section 51 relatively close to the first steel pipe pile 1 by the protruding height He of the inner fitting peak section 51 relatively close to the first steel pipe pile 1 ranges from 0.5 to 0.9.
[0073]
As shown in FIG. 17, the predetermined clearance CL is generally present in the radial direction which is the axial center orthogonal direction X. Therefore, in consideration of this clearance CL, it is preferable that the above-described relationship (0.5xHc’ <Ht’ <0.9xHc’) is established even in the relationship between effective protruding heights He’ (=Hc-1.5xCL) and Ht’ (=Ht-1.5xCL).
[0074]
In addition, in order to prevent separation between the outer fitting peak sections 31 and the inner fitting peak sections 51 when a tensile force or a bending force acts, it is desirable to set the lower limit value for the protruding height Ht. Here, a bending test was conducted in three cases in which Ht was changed to 2.4 mm,
3.3 mm, and 4.2 mm while the outer diameter Dp of the steel pipe pile is 800.0 mm.
As shown in FIG. 18, when Ht=2.4 mm, the maximum proof stress was determined due to separation between the outer fitting peak sections 31 and the inner fitting peak sections 51. In contrast, when Ht=3.3 mm or greater, the maximum proof stress is determined due to bearing fracture of the outer fitting peak sections 31 or the inner fitting peak sections 51. Therefore, in a case of aiming at stable fracture circumstances of bearing fracture as much as possible, instead of separation between the outer fitting peak sections 31 and the inner fitting peak sections 51, it is desirable to
- 38 set Ht>Dp/250 as the lower limit value for the protruding height Ht.
[0075]
In the joint structure 7 for a steel pipe pile according to the embodiment, a joint can be reduced in weight while desired strength is ensured by causing the plate thickness of the outer fitting valley section 33 positioned farthest to the outer fitting front end side to be smaller than the plate thickness of the inner fitting valley section 53 positioned farthest to the inner fitting front end side, and regulating the ratio of the plate thicknesses. Therefore, the joint for a steel pipe pile can be reduced in weight, so that workability is improved.
[0076] <Second Embodiment
A second embodiment of the present invention will be described below. The second embodiment basically corresponds to a modification example of the first embodiment and will be described using the same reference signs as the reference signs used in the first embodiment, and illustration will be omitted.
That is, the present embodiment basically has a configuration similar to that of the first embodiment. However, a ratio obtained by dividing the plate thickness of the outer fitting valley section 33 closest to the second steel pipe pile 2 by the plate thickness of the inner fitting valley section 53 closest to the first steel pipe pile 1 ranges from 0.84 to 0.94.
[0077]
FIG. 19 shows a graph in which the horizontal axis indicates the radius thickness ratio (Dp/tbl) of the outer diameter Dp of the steel pipe pile in the related art and the plate thickness tbl of the outer fitting valley section 33 in the first outer fitting stepped section 41, and the vertical axis indicates the plate thickness ratio (tbl/tpl) of
- 39 the plate thickness tpl of the inner fitting valley section 53 in the first inner fitting stepped section 61 to the plate thickness tbl of the outer fitting valley section 33 in the first outer fitting stepped section 41. According to the drawing, in a case where the material of the steel pipe is the material of SM570, or the plate thickness of the steel pipe is thick, the plate thickness of the outer fitting valley section is in a thick range (range in which D/tpl is equal to or smaller than 50). Therefore, the plate thickness ratio of the inner fitting valley sections 53 to the outer fitting valley sections 33 becomes equal to or greater than 0.94 having little difference with respect to the structure in the related art. Since the weight can be preferably reduced within a range of the radius thickness ratio from 50 to 150, it is preferable that the plate thickness ratio ranges from 0.84 to 0.94. In regard to the plate thickness ratio of the outer fitting valley sections 33 to the inner fitting valley sections 53, a linear relationship is established between the plate thickness ratio and the radius thickness ratio, as indicated in the following Expression 1.
(tbl/tpl)=0.99-0.00lx(Dp/tbl)... (Expression 1) [0078]
In the joint structure 7 for a steel pipe pile according to the present embodiment, it is possible to further reduce the plate thickness of the outer fitting end section 3 which affects the weight of the joint more than the inner fitting end section 5, by causing the ratio of the plate thicknesses to be within the range described above, and it is possible to further reduce the weight of the joint in its entirety. Therefore, the joint for a steel pipe pile can be further reduced in weight.
[0079] <Third Embodiment*
A third embodiment of the present invention will be described below. The
- 40 third embodiment basically corresponds to another modification example of the first embodiment and will be described using the same reference signs as the reference signs used in the first embodiment, and illustration will be omitted.
That is, the present embodiment basically has a configuration similar to that of the first embodiment. However, in each of the outer fitting peak sections 31, a ratio obtained by dividing the protruding height of a different outer fitting peak section 31 next to the outer fitting peak section 31 relatively close to the second steel pipe pile 2 by the protruding height of the outer fitting peak section 31 relatively close to the second steel pipe pile 2 ranges from 0.6 to 0.8. In each of the inner fitting peak sections 51, a ratio obtained by dividing the protruding height of a different inner fitting peak section 51 next to the inner fitting peak section 51 relatively close to the first steel pipe pile 1 by the protruding height of the inner fitting peak section 51 relatively close to the first steel pipe pile 1 ranges from 0.6 to 0.8.
[0080]
In the joint structure for a steel pipe pile according to the present embodiment, it is possible to sufficiently ensure the strength in a direction parallel to the axial line L by causing the ratio of the protruding height of the peak section on the base end side to the protruding height of the peak section on the front end side to be within the range described above. Therefore, the joint for a steel pipe pile can be reduced in weight while the strength of the joint for a steel pipe pile is maintained.
[0081]
Hereinabove, each of the embodiments of the present invention has been described in detail. Each of the embodiments described above is merely a specific example for executing the present invention. Thus, the technical scope of the present invention is not to be interpreted in a limited manner.
[0082]
For example, in the joint structure 7 for a steel pipe pile according to each of the embodiments, the outer fitting end section 3 or the inner fitting end section 5 may be provided in the first steel pipe pile 1 or the end portion of the second steel pipe pile 2 itself by cutting the end portions of the first steel pipe pile 1 and the second steel pipe pile 2. In addition, the inner fitting end section 5 may be provided in the first steel pipe pile 1, and the outer fitting end section 3 may be provided in the second steel pipe pile 2.
[Industrial Applicability] [0083]
In a joint structure for a steel pipe pile according to the present invention, a joint can be reduced in weight while desired strength is ensured. Therefore, the joint for a steel pipe pile can be reduced in weight, and it is possible to provide a steel pipe pile having improved workability. Thus, the present invention has high industrial applicability.
[Brief Description of the Reference Symbols] [0084]
FIRST STEEL PIPE PILE
SECOND STEEL PIPE PILE
OUTER FITTING END SECTION
OUTER FITTING PEAK SECTION
31a TENSILE SURFACE
31b COMPRESSIVE SURFACE
OUTER FITTING GROOVE SECTION
OUTER FITTING VALLEY SECTION
OUTER FITTING EXTRA LENGTH SECTION
OUTER FITTING STEPPED SECTION
FIRST OUTER FITTING STEPPED SECTION
SECOND OUTER FITTING STEPPED SECTION
THIRD OUTER FITTING STEPPED SECTION
FOURTH OUTER FITTING STEPPED SECTION
INNER FITTING END SECTION
INNER FITTING PEAK SECTION
51a TENSILE SURFACE
51b COMPRESSIVE SURFACE
INNER FITTING GROOVE SECTION
INNER FITTING VALLEY SECTION
INNER FITTING EXTRA LENGTH SECTION
INNER FITTING STEPPED SECTION
FIRST INNER FITTING STEPPED SECTION
SECOND INNER FITTING STEPPED SECTION
THIRD INNER FITTING STEPPED SECTION
FOURTH INNER FITTING STEPPED SECTION
JOINT STRUCTURE FOR A STEEL PIPE PILE
A FRONT END SIDE
B BASE END SIDE
L AXIAL LINE
W CIRCUMFERENTIAL DIRECTION
X AXIAL CENTER ORTHOGONAL DIRECTION
Y AXIAL DIRECTION
Claims (3)
1. A joint structure for a steel pipe pile, in which a first steel pipe pile having an outer fitting end section and a second steel pipe pile having an inner fitting end section are coupled to each other in a state where the outer fitting end section and the inner fitting end section share the same axial line, the joint structure comprising, in a case of being seen in a cross section along the axial line:
outer fitting stepped sections that are provided at a plurality of positions along the axial line on an inner side of the outer fitting end section such that diameters increase in steps toward the second steel pipe pile, wherein each of the outer fitting stepped sections has an outer fitting peak section relatively close to the second steel pipe pile and an outer fitting valley section adjacent to the outer fitting peak section; and inner fitting stepped sections that are provided at a plurality of positions along the axial line on an outer side of the inner fitting end section such that diameters decrease in steps toward the first steel pipe pile, wherein each of the inner fitting stepped sections has an inner fitting peak section relatively close to the first steel pipe pile and an inner fitting valley section adjacent to the inner fitting peak section, wherein each of the inner fitting peak sections is interlocked with each of the outer fitting peak sections in a state where the inner fitting end section is inserted into the outer fitting end section and is relatively rotated about the axial line, wherein in each of the outer fitting peak sections, a ratio obtained by dividing a protruding height of the outer fitting peak section next to the outer fitting peak section relatively close to the second steel pipe pile by a protruding height of the outer fitting peak section relatively close to the second steel pipe pile ranges from 0.5
- 44 to 0.9, wherein in each of the inner fitting peak sections, a ratio obtained by dividing a protruding height of the inner fitting peak section next to the inner fitting peak section relatively close to the first steel pipe pile by a protruding height of the inner fitting peak section relatively close to the first steel pipe pile ranges from 0.5 to 0.9, and wherein a plate thickness of the outer fitting valley section closest to the second steel pipe pile is smaller than a plate thickness of the inner fitting valley section closest to the first steel pipe pile, and a ratio obtained by dividing the plate thickness of the outer fitting valley section closest to the second steel pipe pile by the plate thickness of the inner fitting valley section closest to the first steel pipe pile is equal to or greater than 0.84.
2. The joint structure for a steel pipe pile according to Claim 1, wherein a ratio obtained by dividing the plate thickness of the outer fitting valley section closest to the second steel pipe pile by the plate thickness of the inner fitting valley section closest to the first steel pipe pile ranges from 0.84 to 0.94.
3. The joint structure for a steel pipe pile according to Claim 1 or 2, wherein in each of the outer fitting peak sections, a ratio obtained by dividing the protruding height of the outer fitting peak section next to the outer fitting peak section relatively close to the second steel pipe pile by the protruding height of the outer fitting peak section relatively close to the second steel pipe pile ranges from 0.6 to 0.8, and wherein in each of the inner fitting peak sections, a ratio obtained by dividing
- 45 the protruding height of the inner fitting peak section next to the inner fitting peak section relatively close to the first steel pipe pile by the protruding height of the inner fitting peak section relatively close to the first steel pipe pile ranges from 0.6 to 0.8.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-231400 | 2015-11-27 | ||
| JP2015231400 | 2015-11-27 | ||
| PCT/JP2016/084082 WO2017090503A1 (en) | 2015-11-27 | 2016-11-17 | Joint structure for steel pipe pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2016360218A1 AU2016360218A1 (en) | 2018-05-10 |
| AU2016360218B2 true AU2016360218B2 (en) | 2019-05-02 |
Family
ID=58763103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2016360218A Active AU2016360218B2 (en) | 2015-11-27 | 2016-11-17 | Joint structure for steel pipe pile |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JP6354911B2 (en) |
| CN (1) | CN108291376B (en) |
| AU (1) | AU2016360218B2 (en) |
| HK (1) | HK1252777A1 (en) |
| MY (1) | MY192569A (en) |
| SG (1) | SG11201803193TA (en) |
| TW (1) | TWI602971B (en) |
| WO (1) | WO2017090503A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001182052A (en) * | 1999-12-24 | 2001-07-03 | Kubota Corp | Columnar body |
| JP2004225393A (en) * | 2003-01-23 | 2004-08-12 | Jfe Steel Kk | Joining structure and joining method for steel pipe |
| JP2015143466A (en) * | 2013-12-26 | 2015-08-06 | 新日鐵住金株式会社 | joint structure of steel pipe pile |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4444421A (en) * | 1980-11-12 | 1984-04-24 | Varco International, Inc. | Driveable pile connections |
| IT1176371B (en) * | 1984-06-29 | 1987-08-18 | Innocenti Santeustacchio Spa | JOINT FOR HEAD-TO-HEAD CONNECTION OF METAL TUBES, IN PARTICULAR FOR MARINE PALLING |
| CN2279972Y (en) * | 1997-03-07 | 1998-04-29 | 蓝培熙 | Joint for steel pipe or tube |
| JP3336430B2 (en) * | 1998-12-15 | 2002-10-21 | 株式会社クボタ | Vertical joints for steel pipe sheet piles |
| JP4645268B2 (en) * | 2005-03-31 | 2011-03-09 | Ｊｆｅスチール株式会社 | Joint structure of steel pipe pile for landslide prevention and steel pipe pile for landslide prevention provided with the same |
| CN201273426Y (en) * | 2008-08-12 | 2009-07-15 | 连云港中复连众复合材料集团有限公司 | Large-diameter glass fiber reinforced epoxy plastics pipe connector |
| JP5284249B2 (en) * | 2009-11-30 | 2013-09-11 | 新日鐵住金株式会社 | Steel pipe sheet pile joint structure and steel pipe sheet pile foundation |
| SG11201408621VA (en) * | 2012-11-21 | 2015-01-29 | Nippon Steel & Sumitomo Metal Corp | Joint structure of steel-pipe pile, and steel-pipe pile |
| CN104452744A (en) * | 2014-12-02 | 2015-03-25 | 中交公路规划设计院有限公司 | Steel pipe composite pile with shear connection structure and shear connection structure thereof |
-
2016
- 2016-11-17 AU AU2016360218A patent/AU2016360218B2/en active Active
- 2016-11-17 WO PCT/JP2016/084082 patent/WO2017090503A1/en active Application Filing
- 2016-11-17 MY MYPI2018701568A patent/MY192569A/en unknown
- 2016-11-17 JP JP2017552376A patent/JP6354911B2/en active Active
- 2016-11-17 SG SG11201803193TA patent/SG11201803193TA/en unknown
- 2016-11-17 CN CN201680066850.9A patent/CN108291376B/en not_active Expired - Fee Related
- 2016-11-18 TW TW105137784A patent/TWI602971B/en active
-
2018
- 2018-09-20 HK HK18112139.7A patent/HK1252777A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001182052A (en) * | 1999-12-24 | 2001-07-03 | Kubota Corp | Columnar body |
| JP2004225393A (en) * | 2003-01-23 | 2004-08-12 | Jfe Steel Kk | Joining structure and joining method for steel pipe |
| JP2015143466A (en) * | 2013-12-26 | 2015-08-06 | 新日鐵住金株式会社 | joint structure of steel pipe pile |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017090503A1 (en) | 2017-06-01 |
| AU2016360218A1 (en) | 2018-05-10 |
| JPWO2017090503A1 (en) | 2018-07-05 |
| CN108291376A (en) | 2018-07-17 |
| CN108291376B (en) | 2020-06-16 |
| HK1252777A1 (en) | 2019-05-31 |
| TW201720991A (en) | 2017-06-16 |
| TWI602971B (en) | 2017-10-21 |
| JP6354911B2 (en) | 2018-07-11 |
| SG11201803193TA (en) | 2018-05-30 |
| MY192569A (en) | 2022-08-29 |
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