WO2017090503A1 - 鋼管杭の継手構造 - Google Patents
鋼管杭の継手構造 Download PDFInfo
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- WO2017090503A1 WO2017090503A1 PCT/JP2016/084082 JP2016084082W WO2017090503A1 WO 2017090503 A1 WO2017090503 A1 WO 2017090503A1 JP 2016084082 W JP2016084082 W JP 2016084082W WO 2017090503 A1 WO2017090503 A1 WO 2017090503A1
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- fitting
- steel pipe
- pipe pile
- internal
- external
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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
Definitions
- the present invention relates to a joint structure for steel pipe piles.
- This application claims priority based on Japanese Patent Application No. 2015-231400 for which it applied to Japan on November 27, 2015, and uses the content here.
- a pair of external fitting end portions and internal fitting end portions that can be fitted to each other are separately provided in the first pile and the second pile adjacent in the axial direction. It is formed.
- the engaging convex portion and the engaged convex portion that are engaged with each other by relative rotation around the axial center are in the axial direction.
- a plurality are formed.
- the formation portion of the engagement convex portion provided on the distal end side of the outer fitting end portion is more than the formation portion of the engagement convex portion provided on the base end side. Formed in large diameter.
- the portion where the inner protrusion end portion is provided on the distal end side is formed to have a smaller diameter than the portion where the engagement convex portion is provided on the base end side.
- the joint structure of a steel pipe pile is a state in which a plurality of steel pipe piles are coupled in the axial direction, and compression, tension, and bending forces act on the joint portion.
- the joint structure of a steel pipe pile disclosed in Patent Document 1 is not limited to the outer fitting end part and the inner fitting end part from the base end side to the tip end side, although the load ratios of compression, tension, and bending force are different.
- the plate thicknesses of the engaging portions are all the same in the axial direction. For this reason, in the joint structure of the steel pipe pile disclosed in Patent Document 1, in particular, because there are many useless parts in the thickness of the outer fitting end portion and the distal end side of the inner fitting end portion, the plate thickness increases more than necessary. As a result, there was a problem that the cost increased.
- the plate thickness of the engaged convex portion is gradually reduced from the proximal end side to the distal end side of the outer fitting end portion and the inner fitting end portion. By doing so, the load ratio of the force of compression, tension and bending is taken into consideration.
- the steel pipe pile joint structure disclosed in Patent Document 2 since the plate thickness of the engaged protrusions is the same between the outer fitting end part and the inner fitting end part, the steel material weight of the entire joint is more than necessary. There was a problem that the cost increased due to the increase.
- the joint structure of the steel pipe pile disclosed by patent document 2 is by making the plate
- the taper is formed in the axial direction.
- the ratio between the protruding height of the compression surface and the protruding height of the tensile surface is less than 0.50. For this reason, the steel material weight of the whole joint for ensuring equal strength of compression, tension, and bending cannot be minimized, resulting in an increase in material cost.
- This invention is made
- the first steel pipe pile having an outer fitting end part and the second steel pipe pile having an inner fitting end part are formed by the outer fitting end part and the inner fitting. It is a joint structure of steel pipe piles connected in the state of sharing the same axial core line with the end part, and when viewed in cross section along the axial core line: on the axial core line inside the external fitting end part
- An outer fitting step portion is provided at a plurality of positions along the outer steel plate so that the diameter gradually increases toward the second steel pipe pile, and each of the outer fitting step portions is relatively close to the second steel pipe pile.
- a fitting mountain portion and an outer fitting valley portion adjacent to the outer fitting mountain portion a step toward the first steel pipe pile at a plurality of positions along the axial core line outside the inner fitting end portion.
- the inner fitting step portion is provided so as to reduce the diameter of the inner fitting step, and each of the inner fitting step portions is relatively close to the first steel pipe pile, and the inner fitting step portion is adjacent to the inner fitting step portion.
- Each of the inner fitting mountain portions in a state in which each of the inner fitting mountain portions is inserted into the outer fitting end portion and relatively rotated around the axis line.
- the outer fitting mountain adjacent to the outer fitting mountain portion due to the protruding height of the outer fitting mountain portion relatively close to the second steel pipe pile.
- the ratio obtained by dividing the protrusion height of the portion is 0.5 or more and 0.9 or less, and in each of the internal fitting mountain portions, the protruding height of the internal fitting mountain portion that is relatively close to the first steel pipe pile. Then, the ratio obtained by dividing the protruding height of the internal fitting mountain portion adjacent to the internal fitting mountain portion is 0.5 or more and 0.9 or less, and the internal fitting closest to the first steel pipe pile.
- the plate thickness of the external fitting valley portion closest to the second steel pipe pile is smaller than the plate thickness of the valley portion, and depending on the plate thickness of the internal fitting valley portion closest to the first steel pipe pile.
- the ratio obtained by dividing the thickness of the valley fitting nearest the outside of the second steel pipe pile is 0.84 or more; and wherein the.
- the weight of the joint of the steel pipe pile can be reduced, and workability is improved.
- the plate of the outer fitting valley portion closest to the second steel pipe pile is determined by the plate thickness of the inner fitting valley portion closest to the first steel pipe pile.
- the ratio obtained by dividing the thickness may be 0.84 or more and 0.94 or less.
- the weight of the steel pipe pile joint can be further reduced.
- the protrusion height of the external fitting mountain portion that is relatively close to the second steel pipe pile.
- the ratio obtained by dividing the protruding height of the outer fitting mountain portion adjacent to the outer fitting mountain portion is 0.6 or more and 0.8 or less, and in each of the inner fitting mountain portions, the relative The ratio obtained by dividing the projecting height of the inner fitting mountain portion adjacent to the inner fitting mountain portion by the projecting height of the inner fitting mountain portion close to the first steel pipe pile is 0.6 or more and 0.8 or less. It may be.
- the weight of the steel pipe pile joint can be reduced while maintaining the strength of the steel pipe pile joint.
- FIG. 1 It is a perspective view which shows the joint structure of the steel pipe pile which concerns on 1st Embodiment of this invention. It is a figure which shows the external fitting end part of the joint structure of the steel pipe pile, Comprising: It is sectional drawing at the time of seeing in the cross section containing an axial core wire. It is a figure which shows the external fitting end part of the joint structure of the same steel pipe pile, Comprising: It is a fragmentary sectional view of the A section of FIG. It is a side view which shows the internal fitting end part of the joint structure of the steel pipe pile. It is a figure which shows the internal fitting end part of the joint structure of the steel pipe pile, Comprising: It is a fragmentary sectional view of the B section of FIG.
- FIG. 7 It is a perspective view which shows the internal fitting end part inserted in an external fitting end part by the joint structure of the same steel pipe pile.
- the joint structure of the steel pipe pile it is a perspective view which shows the state which rotated the inner fitting end part with respect to the outer fitting end part, and a part of outer fitting end part is seen by the cross section.
- the plate thickness of the external fitting step part and internal fitting step part of a structure is shown, (c) shows the comparison of the plate thickness in (a) and (b).
- the graph which shows the relationship between the diameter-thickness ratio of the outer diameter of a steel pipe pile, and the thickness of an external fitting end part, and the ratio of the maximum bending moment and the total plastic bending moment of a steel pipe pile of the joint structure of the steel pipe pile concerning the said embodiment It is. It is a graph which shows the relationship between the diameter thickness ratio and proof stress ratio of the internal fitting end part in the joint structure of the steel pipe pile which concerns on the said embodiment, and is a graph which shows the relationship between the diametrical thickness ratio and proof stress ratio of an internal fitting end part. .
- the steel pipe pile joint structure 7 according to the present embodiment is used for a landslide pile, a support pile, a friction pile or the like, and as shown in FIG. Two steel pipe piles 2 are connected in the axial direction Y.
- the steel pipe pile joint structure 7 includes an outer fitting end portion 3 and an inner fitting end portion 5 that can be fitted to each other.
- the outer fitting end 3 is attached to the end of the first steel pipe pile 1 by welding or the like
- the inner fitting end 5 is attached to the end of the second steel pipe pile 2 by welding or the like.
- the outer fitting end 3 and the inner fitting end 5 are mutually in an axial direction Y parallel to the axis L. It becomes a pair of opposites.
- each of the first steel pipe pile 1 and the second steel pipe pile 2 has, for example, an outer diameter Dp of the steel pipe pile of about 318.5 mm to 1625.6 mm, and a plate thickness t of the steel pipe pile of 6.0 mm to 30.0 mm. Targeting the degree.
- the outer fitting end portion 3 is formed with a plurality of outer fitting mountain portions 31 formed so as to protrude inward in the axis orthogonal direction X and a plurality of outer fitting mountain portions 31 formed adjacent to the outer fitting mountain portion 31 in the circumferential direction W. It has the external fitting groove part 32 and the external fitting trough part 33 formed in the base end side B from the external fitting mountain part 31 in the axial direction Y.
- the external fitting end portion 3 is formed by the external fitting mountain portions 31 and the external fitting valley portions 33 being alternately adjacent to each other in the axial direction Y.
- the outer fitting mountain portions 31 and the outer fitting groove portions 32 are alternately formed in the circumferential direction W, and the plurality of outer fitting mountain portions 31 are substantially aligned in the axial direction Y and the circumferential direction W. While being arranged, the plurality of external fitting groove portions 32 are arranged in a substantially line in the axial direction Y and the circumferential direction W.
- the external fitting end part 3 has an external fitting extra length part 38 as a part attached to the end part of the first steel pipe pile 1 by welding or the like.
- the inner fitting end 5 has a plurality of inner fitting mountain parts 51 formed to protrude outward in the axial center orthogonal direction X and a plurality of inner fitting mountain parts 51 formed adjacent to the inner fitting mountain part 51 in the circumferential direction W. It has the internal fitting groove part 52 and the internal fitting trough part 53 formed in the base end side B from the internal fitting mountain part 51 in the axial direction Y.
- the internal fitting end portion 5 is formed such that internal fitting mountain portions 51 and internal fitting valley portions 53 are alternately adjacent to each other in the axial direction Y.
- the inner fitting mountain portions 51 and the inner fitting groove portions 52 are alternately formed in the circumferential direction W, and the plurality of inner fitting mountain portions 51 are substantially aligned in the axial direction Y and the circumferential direction W.
- the plurality of internally fitted groove portions 52 are arranged in a substantially line in the axial direction Y and the circumferential direction W.
- the internal fitting end portion 5 has an internal fitting extra length portion 58 as a portion attached to the end portion of the second steel pipe pile 2 by welding or the like.
- the outer fitting mountain portion 31 has an axis of the first steel pipe pile 1 that is more than the outer fitting structural portion 32 adjacent in the circumferential direction W and the outer fitting valley portion 33 adjacent in the axial direction Y. It is formed to project in a substantially rectangular shape or the like toward the central axis in the core direction Y.
- the outer fitting mountain portion 31 has a predetermined protruding height in the axial center orthogonal direction X from the outer fitting valley portion 33 adjacent to the distal end side A or the proximal end side B in the axial direction Y.
- Hc and Ht are examples of the first steel pipe pile 1 that is more than the outer fitting structural portion 32 adjacent in the circumferential direction W and the outer fitting valley portion 33 adjacent in the axial direction Y. It is formed to project in a substantially rectangular shape or the like toward the central axis in the core direction Y.
- the outer fitting mountain portion 31 has a predetermined protruding height in the axial center orthogonal direction X from the outer fitting valley portion 33 adjacent
- the external fitting valley portion 33 is provided with a plurality of external fitting step portions 4 from the distal end side A to the proximal end side B in the axial direction Y.
- the axial center orthogonal direction X is provided in each of the external fitting step portions 4.
- the outer fitting valley portion 33 has an outer fitting step portion 4 on the most proximal side B in the axial direction Y to an outer fitting extra length portion 38 having a predetermined plate thickness D in the axial direction orthogonal to the axial direction Y.
- the outer fitting step portion 4 closest to the distal end side A in the axial direction Y is the first outer fitting step portion 41.
- the external fitting valley portion 33 is first outer in order from the distal end side A to the proximal end side B in the axial direction Y.
- a fitting step 41, a second outer fitting step 42, a third outer fitting step 43, and a fourth outer fitting step 44 are provided.
- the outer fitting end 3 has a step toward the second steel pipe pile 2 at a plurality of positions along the axis core L inside the outer fitting end 3 when viewed in a cross section including the axis L.
- the external fitting step part 4 is provided so that it may expand in diameter.
- Each outer fitting step part 4 has an outer fitting mountain part 31 relatively close to the second steel pipe pile 2 and an outer fitting valley part 33 adjacent to the outer fitting mountain part 31. Note that hatching is omitted in the cross-sectional views of FIGS. 3, 5, 8 to 13, and 16 for easy understanding of the drawings.
- the inner fitting mountain portion 51 has an axial core of the second steel pipe pile 2 than the inner fitting groove portion 52 adjacent in the circumferential direction W and the inner fitting valley portion 53 adjacent in the axial direction Y. It is formed to project in a substantially rectangular shape or the like toward the opposite side of the central axis in the direction Y.
- the internal fitting mountain portion 51 has a predetermined protruding height in the axial center orthogonal direction X from the internal fitting valley portion 53 adjacent to the distal end side A or the proximal end side B in the axial direction Y.
- Hc and Ht are examples of the internal fitting mountain portion 51 that has a predetermined protruding height in the axial center orthogonal direction X from the internal fitting valley portion 53 adjacent to the distal end side A or the proximal end side B in the axial direction Y.
- the internal fitting valley portion 53 is provided with a plurality of internal fitting step portions 6 from the distal end side A to the proximal end side B in the axial direction Y.
- each internal fitting step portion 6 the axial center orthogonal direction X is provided. And having a predetermined plate thickness.
- the inner fitting valley portion 53 has an inner fitting step portion 6 on the most proximal side B in the axial direction Y to an inner fitting extra length portion 58 having a predetermined plate thickness D in the axial direction orthogonal to the axial direction Y.
- the plate thickness D of the internal fitting surplus length portion 58 does not necessarily need to match the plate thickness D of the external fitting surplus length portion 38.
- the internal fitting step portion 6 closest to the tip end side A in the axial direction Y is the first internal fitting step portion 61.
- the internal fitting valley portion 53 is first in order from the distal end side A to the proximal end side B in the axial direction Y.
- a fitting step 61, a second fitting step 62, a third fitting step 63, and a fourth generic step 64 are provided.
- the inner fitting end portion 5 has a step toward the first steel pipe pile 1 at a plurality of positions along the axial core line L outside the inner fitting end portion 5 when viewed in cross section along the axial core line L.
- the internal fitting step 6 is provided so as to reduce the diameter.
- Each internal fitting step part 6 has an internal fitting mountain part 51 relatively close to the first steel pipe pile 1 and an internal fitting valley part 53 adjacent to the internal fitting mountain part 51.
- the joint structure 7 of the steel pipe pile includes the first steel pipe pile 1 and the second steel pipe pile 2 by fitting the outer fitting end portion 3 and the inner fitting end portion 5 to each other. Are connected in the axial direction Y.
- the steel pipe pile joint structure 7 is first inserted into the outer fitting end 3 attached to the first steel pipe pile 1 with the inner fitting end 5 attached to the second steel pipe pile 2. To do.
- the protrusion height of the external fitting mountain part 31 and the internal fitting mountain part 51 shall be below the depth of the axial center orthogonal direction X of the internal fitting groove part 52 and the external fitting groove part 32.
- the outer fitting mountain portion 31 and the inner fitting mountain portion 51 pass through the inner fitting groove portion 52 and the outer fitting structure portion 32.
- the joint structure 7 of the steel pipe pile is formed by connecting the first steel pipe pile 1 and the second steel pipe pile 2 with the inner fitting end portion 5 into the outer fitting end portion 3. Rotate relative to the circumferential direction W around L.
- the protrusion height of the external fitting peak part 31 and the internal fitting peak part 51 is below the depth of the axial center orthogonal direction X of the internal fitting valley part 53 and the external fitting valley part 33.
- the outer fitting mountain portion 31 and the inner fitting mountain portion 51 are fitted into the inner fitting valley portion 53 and the outer fitting valley portion 33.
- the length in the axial direction Y of the external fitting mountain portion 31 is set to be equal to or less than the length in the axial direction Y of the internal fitting valley portion 53, and the axial direction of the internal fitting mountain portion 51.
- the length of Y is equal to or less than the length of the external fitting valley portion 33 in the axial direction Y.
- the outer fitting mountain portion 31 and the inner fitting mountain portion 51 are in a state where the inner fitting end portion 5 inserted into the outer fitting end portion 3 is relatively rotated in the circumferential direction W. They are locked together in the axial direction Y.
- the number of the external fitting mountain parts 31 or the internal fitting mountain parts 51 in the circumferential direction W is preferably 4, 16, 32, or the like.
- the joint structure 7 of the steel pipe pile is formed by pivoting the first steel pipe pile 1 and the second steel pipe pile 2 in a state where the outer fitting mountain portion 31 and the inner fitting mountain portion 51 are locked to each other.
- a tensile force Pt acts in the direction of separating from each other in the core direction Y.
- the outer fitting mountain portion 31 is a tensile surface 31 a that is the base end side B in the axial direction Y, and the tensile force Pt is transmitted from the inner fitting mountain portion 51.
- the inner fitting mountain portion 51 is a tensile surface 51 a that is the base end side B in the axial direction Y, and the tensile force Pt is transmitted from the tensile surface 31 a of the outer fitting mountain portion 31.
- the tensile surface 31a of the outer fitting mountain portion 31 and the tensile surface 51a of the inner fitting mountain portion 51 have a predetermined protruding height Ht in the axial direction orthogonal to the axis X. Further, the tensile force Pt having the same magnitude is transmitted between the tension surface 31 a of the outer fitting mountain portion 31 and the tension surface 51 a of the inner fitting mountain portion 51. At this time, in each of the outer fitting stepped portion 4 and the inner fitting stepped portion 6, it is transmitted from the distal end side A in the axial direction Y toward the proximal end side B to each of the outer fitting mountain portion 31 and the inner fitting mountain portion 51.
- the load factor of the applied tensile force Pt gradually increases.
- the load factor of the tensile force pt at the fourth outer fitting step portion 44 and the fourth inner fitting step portion 64 that are the most proximal side B is maximized.
- the joint structure 7 of a steel pipe pile has the 1st steel pipe pile 1 and the 2nd steel pipe pile 2 in the state to which the external fitting mountain part 31 and the internal fitting mountain part 51 were mutually latched.
- the compressive force Pc acts in a direction that causes the two to approach each other in the axial direction Y.
- the outer fitting mountain portion 31 is a compression surface 31 b that is the tip end side A in the axial direction Y, and the compression force Pc is transmitted from the inner fitting mountain portion 51.
- the internal fitting mountain portion 51 is a compression surface 51 b that is the tip side A in the axial direction Y, and the compression force Pc is transmitted from the compression surface 31 b of the external fitting mountain portion 31.
- the compression surface 31 b of the outer fitting mountain portion 31 and the compression surface 51 b of the inner fitting mountain portion 51 have a predetermined protruding height Hc in the axial center orthogonal direction X. Further, the compression force Pc having the same magnitude is transmitted between the compression surface 31 b of the outer fitting mountain portion 31 and the compression surface 51 b of the inner fitting mountain portion 51. At this time, in each of the outer fitting stepped portion 4 and the inner fitting stepped portion 6, it is transmitted from the distal end side A in the axial direction Y toward the proximal end side B to each of the outer fitting mountain portion 31 and the inner fitting mountain portion 51. The burden rate of the compression force Pc to be applied gradually increases. As a result, the load factor of the compressive force Pc at the fourth outer fitting step portion 44 and the fourth inner fitting step portion 64 that are the most proximal side B is maximized.
- the joint structure 7 of the steel pipe pile according to the present embodiment includes an outer fitting valley portion 33 and an inner fitting valley portion 53, each having an outer fitting step portion 4 and an inner fitting step portion 6. It is formed to have a predetermined plate thickness in the orthogonal direction X.
- the external fitting valley portion 33 in the first external fitting step portion 41 has a plate thickness tb1
- the external fitting valley portion 33 in the second external fitting step portion 42 has a plate thickness tb2
- a third external fitting step
- the outer fitting valley portion 33 in the portion 43 has a plate thickness tb3
- the outer fitting valley portion 33 in the fourth outer fitting step portion 44 has a plate thickness tb4.
- the outer fitting valley portion 33 is, in particular, the outer fitting step portion 4 adjacent in the axial direction Y, and the thickness of the outer fitting valley portion 33 in the outer fitting step portion 4 on the base end side B in the axial direction Y is In the axial direction Y, the thickness is larger than the thickness of the outer fitting valley portion 33 at the outer fitting step portion 4 on the distal end side A.
- the outer fitting valley portion 33 is a plate at the second outer fitting stepped portion 42.
- the thickness tb2 is larger than the plate thickness tb1 at the first external fitting step portion 41.
- the outer fitting valley portion 33 has a plate thickness tb3 at the third outer fitting step portion 43 larger than a plate thickness tb2 at the second outer fitting step portion 42, and a plate at the fourth outer fitting step portion 44.
- the thickness tb4 is larger than the plate thickness tb3 at the third external fitting step portion 43.
- the internal fitting valley part 53 in the 1st internal fitting step part 61 is plate
- the internal fitting trough part 53 in the 2nd internal fitting step part 62 is plate
- the internal fitting valley part 53 in the part 63 has a plate thickness tp3
- the internal fitting valley part 53 in the fourth internal fitting step part 64 has a plate thickness tp4.
- the internal fitting valley portion 53 is, in particular, the internal fitting step portion 6 adjacent to the axial direction Y, and the thickness of the internal fitting valley portion 53 at the internal fitting step portion 6 on the base end side B in the axial direction Y is In the axial direction Y, the thickness is larger than the plate thickness of the internal fitting valley portion 53 at the internal fitting step portion 6 on the distal end side A.
- the inner fitting valley portion 53 is a plate in the second inner fitting step portion 62 when the inner fitting step portion 6 is provided in four steps from the distal end side A to the proximal end side B in the axial direction Y.
- the thickness tp2 is larger than the plate thickness tp1 at the first internal fitting step 61.
- the inner trough portion 53 has a plate thickness tp3 at the third inner fitting step portion 63 larger than a plate thickness tp2 at the second inner fitting step portion 62, and a plate at the fourth inner fitting step portion 64.
- the thickness tp4 is greater than the plate thickness tp3 at the third internal fitting step portion 63.
- the steel pipe pile joint structure 7 includes the outer fitting step 4 and the inner fitting at positions corresponding to each other in the axial direction Y in a state where the outer fitting end 3 and the inner fitting end 5 are relatively rotated.
- a stepped portion 6 is arranged.
- the outer fitting valley portion 33 and the inner fitting valley portion 53 are the outer fitting step portion 4 and the inner fitting step portion 6 that are arranged at positions corresponding to each other, and the outer fitting mountain portion 31 and the inner fitting mountain portion 51 have an axial core. Locked together in direction Y.
- the outer fitting valley portion 33 and the inner fitting valley portion 53 are engaged with the outer fitting mountain portion 31 of the first outer fitting step portion 41 and the inner fitting mountain portion 51 of the fourth inner fitting step portion 64.
- the outer fitting mountain portion 31 of the second outer fitting step portion 42 and the inner fitting mountain portion 51 of the third inner fitting step portion 63 are locked.
- the outer fitting valley portion 33 and the inner fitting valley portion 53 are engaged with the outer fitting mountain portion 31 of the third outer fitting step portion 43 and the inner fitting mountain portion 51 of the second inner fitting step portion 62, and
- the outer fitting mountain portion 31 of the four outer fitting step portion 44 and the inner fitting mountain portion 51 of the first inner fitting step portion 61 are locked.
- the plate thickness tb1 of the external fitting valley portion 33 in the first external fitting step portion 41 is smaller than the plate thickness tp1 of the internal fitting valley portion 53 in the first internal fitting step portion 61.
- the plate thickness tb2 of the external fitting valley portion 33 in the second external fitting step portion 42 is smaller than the plate thickness tp2 of the internal fitting valley portion 53 in the second internal fitting step portion 62.
- the plate thickness tb3 of the external fitting valley portion 33 in the third external fitting step portion 43 is smaller than the plate thickness tp3 of the internal fitting valley portion 53 in the third internal fitting step portion 63.
- the plate thickness tb4 of the external fitting valley portion 33 in the fourth external fitting step portion 44 is smaller than the plate thickness tp4 of the internal fitting valley portion 53 in the fourth internal fitting step portion 64.
- the joint structure 7 of the steel pipe pile includes the difference ⁇ b in the plate thickness of the external fitting valley portion 33 in the external fitting step portion 4 adjacent in the axial direction Y, and the internal fitting step portion 6 adjacent in the axial direction Y.
- the joint structure 7 of a steel pipe pile determines tb1, tb2, tb3, tb4 by determining the plate thickness tp1 and the plate thickness ratio (tb1 / tp1) that is the ratio between the plate thickness tb1 and the plate thickness tp1.
- Tp1, tp2, tp3, and tp4 are all derivable.
- the plate thickness tb1 is the same as the plate thickness tp1
- the plate thickness tb2 is the same as the plate thickness tp2
- the thickness tb3 is the same as the plate thickness tp3
- the plate thickness tb4 is the same as the plate thickness tp4. Therefore, when the conventional steel pipe pile joint structure 9 is compared between the first internal fitting step portion 61 and the first external fitting step portion 41, the first internal fitting step portion 61 that is present radially inward is used. However, its cross-sectional area is small.
- the second fitting step 62, the third fitting step 63, and the fourth fitting step 64 have a smaller sectional area in the inner fitting step 6 than in the outer fitting step 4.
- the inner fitting end portion 5 has a smaller cross-sectional area than the outer fitting end portion 3.
- the joint structure 9 of the conventional steel pipe pile determines the proof stress of the inner fitting end portion 5 and the outer fitting end portion 3 on the basis of the destruction of the inner fitting end portion 5 having a small cross-sectional area.
- the end 3 has the disadvantage of being overdesigned.
- the external fitting end 3 when the tensile force is applied, the external fitting end 3 is deformed so as to expand outward in the axial center orthogonal direction X toward the side opposite to the central axis in the axial direction Y of the first steel pipe pile 1. It is common.
- the inner fitting end portion 5 is generally deformed so as to shrink inward in the axial center orthogonal direction X toward the central axis in the axial direction Y of the second steel pipe pile 2. For this reason, when the expansion of the stress in the circumferential direction at the time of the action of the tensile force is taken into consideration, the inner fitting end portion 5 is deformed so as to be contracted inward and the stress is not easily spread in the circumferential direction.
- the conventional steel pipe pile joint structure 9 has the disadvantage that the outer fitting end portion 3 is overdesigned from the viewpoint of the expansion of stress in the circumferential direction and the relaxation of stress concentration in addition to the above-mentioned viewpoint of the cross-sectional area. .
- the steel pipe pile joint structure 7 according to the present embodiment is configured so that the thickness tb1 of the outer fitting valley portion 33 in the first outer fitting step portion 41 is the first inner fitting step.
- the plate thickness ratio (tb1 / tp1) which is set to be smaller than the plate thickness tp1 of the internal fitting valley portion 53 at the portion 61 and is the ratio between the plate thickness tb1 and the plate thickness tp1, is set to 0.84 or more. That is, in the joint structure 7 of the steel pipe pile according to the present embodiment, the plate of the external fitting valley portion 33 closest to the second steel pipe pile 2 rather than the plate thickness of the internal fitting valley portion 53 closest to the first steel pipe pile 1.
- the ratio obtained by dividing the plate thickness of the external fitting valley portion 33 closest to the second steel pipe pile 2 by the plate thickness of the internal fitting valley portion 53 closest to the first steel pipe pile 1 is 0.84. That's it.
- the thickness of the outer fitting valley portion 33 closest to the second steel pipe pile 2 is smaller than the thickness of the inner fitting valley portion 53 closest to the first steel pipe pile 1, and the first steel pipe pile 1
- the ratio obtained by dividing the plate thickness of the outer fitting valley 33 closest to the second steel pipe pile 2 by the plate thickness of the closest inner fitting valley 53 is 0.84 or more.
- the cross-sectional area of the outer fitting end part 3 can be designed on the basis of destruction of the inner fitting end part 5 having a small cross-sectional area.
- the joint structure 7 of a steel pipe pile can design the cross-sectional area of the external fitting end part 3 small according to the internal fitting end part 5 with a small cross-sectional area. Thereby, it becomes possible to avoid the excessive design of the external fitting end part 3, and to reduce the plate
- the shape of the external fitting surplus length part 38 and the internal fitting surplus length part 58 may be changed.
- the weight reduction of the joint structure 7 of a steel pipe pile can be achieved.
- the steel pipe pile joint structure 7 which concerns on this embodiment it is 2nd steel pipe pile rather than the plate
- the thickness of the outer fitting valley portion 33 closest to 2 is smaller.
- FIG. 13 (b) the thickness of the inner valley portion 53 closest to the first steel pipe pile 1 and the second steel pipe pile 2 are The plate thickness of the closest outer fitting valley portion 33 is the same.
- FIG. 13C is a view showing a comparison between FIG. 13A and FIG. 13B.
- the conventional steel pipe pile joint structure 9 of FIG. 13 (b) is indicated by a dotted line. According to this, it turns out that the direction of the joint structure 7 of the steel pipe pile which concerns on this embodiment has reduced especially the whole thickness of the external fitting end part 3.
- FIG. 13 (c) the conventional steel pipe pile joint structure 9 of FIG. 13 (b) is indicated by a dotted line. According to this, it turns out that the direction of the joint structure 7 of the steel pipe pile which concerns on this embodiment has reduced especially the whole thickness of the external fitting end part 3.
- FIG. 13 (c) the conventional steel pipe pile joint structure 9 of FIG. 13 (b) is indicated by a dotted line. According to this, it turns out that the direction of the joint structure 7 of the steel
- FIG. 14 shows the numerical analysis and the experimental result of the joint yield strength corresponding to the steel pipe pile to be joined in the joint structure of the steel pipe pile according to the present embodiment.
- the shape ratio according to the present embodiment is applied to provide a design safety factor for designing.
- the steel pipe pile is calculated as a completely elastic material in the numerical analysis.
- a steel pipe having a higher strength than the steel pipe corresponding to the original joint is used so that the joint breaks in advance.
- the range of steel pipe piles to which the joints are applied was an outer diameter Dp of 400.0 mm to 1600.0 mm and a steel pipe pile thickness tp of 6.0 mm to 30.0 mm.
- the material standard is SKK40 defined in JIS A 5525 and SM570 defined in JIS G 3106.
- the graph of FIG. 14 shows the joint structure 7 of the steel pipe pile according to this embodiment calculated by FEM analysis with the diameter-thickness ratio (Dp / tp) between the outer diameter Dp and the plate thickness tp of the steel pipe pile to be joined as the horizontal axis.
- the vertical axis is the ratio (Mmax / Mp) of the maximum bending moment Mmax (joint part) of the steel plate and the total plastic bending moment Mp (steel pipe part) of the steel pipe pile.
- FIG. 15A and 15B show the grounds that the outer fitting valley portion 33 and the inner fitting valley portion 53 have different plate thicknesses.
- the horizontal axis represents the diameter-thickness ratio (Dp / tp1) between the outer diameter Dp of the steel pipe pile and the plate thickness tp1 of the inner valley portion 53 in the first inner fitting step portion 61.
- the maximum bending moment Mmax of the joint structure 7 of the steel pipe pile according to the present embodiment calculated by the FEM analysis and the entire fitting valley portion 53 (when the entire circumference of the valley portion of the joint is made effective) are shown.
- the yield strength ratio (Mmax / Mf) with the plastic bending moment Mf is taken as the vertical axis.
- the horizontal axis represents the diameter-thickness ratio (Dp / tb1) between the outer diameter Dp of the steel pipe pile and the plate thickness tb1 of the outer fitting valley portion 33 in the first outer fitting step portion 41.
- the proof stress ratio (Mmax / Mf) between the maximum bending moment Mmax of the present invention calculated by FEM analysis and the total plastic bending moment Mf of the external fitting valley portion 33 is taken as the vertical axis.
- the proof stress ratio is also changed, so that the proof stress ratio is a linear function of the diametric thickness ratio.
- the proof stress ratio is constant regardless of the diameter-thickness ratio in the externally fitted valley portion 33.
- the normal material standards for steel pipe piles are within the range where the outer diameter Dp of the steel pipe pile is 400.0 mm to 1600.0 mm and the plate thickness t of the steel pipe pile is 6.0 mm to 30.0 mm.
- SKK400 defined in JIS A 5525 is shown as the lower limit value of SM
- SM570 defined in JIS G 3106 is shown as the upper limit value of the material standard.
- Table 2 shows the numerical data of FIGS. 15A and 15B.
- the outer fitting end part 3 and the inner fitting end part 5 are formed in a cross-sectional substantially circular shape.
- the cross-sectional area of the external fitting valley portion 33 is calculated from ⁇ ⁇ rb12 2 calculated from the external diameter rb1 of the external fitting valley portion 33 in each external fitting step portion 4 from the internal diameter rb2 of the external fitting valley portion 33.
- the cross-sectional area of the outer fitting valley portion 33 is equal to that of the outer fitting valley portion 33. It is proportional to the square of the plate thickness tb. Further, the cross-sectional area of the internal fitting valley portion 53 is also proportional to the square of the plate thickness tp of the internal fitting valley portion 53 in each internal fitting step portion 6, similarly to the cross-sectional area of the external fitting valley portion 33. .
- the steel pipe pile joint structure 7 has a bending moment ratio of 0.70 to 0.50 in the range of the diameter-thickness ratio of 10.00 to 200.00 at the inner fitting end 5. Therefore, 70 to 50% of the entire circumference of the internal valley portion 53 is considered to be an effective cross section.
- the bending moment ratio is constant regardless of the diameter-thickness ratio as shown in FIG. 15B, and 70% of the entire circumference of the outer fitting valley 33 is considered to be an effective cross section. . Therefore, when the diameter-thickness ratio is set to 200.00 and the design is based on the destruction of the inner fitting valley portion 53, the sectional area of the outer fitting valley portion 33 is 71% (0.50 / 0.70 ⁇ 0).
- the plate thickness tb of the external fitting valley portion 33 is the plate of the internal fitting valley portion 53. Even when the thickness is reduced to 0.84 times the thickness tp (0.84 2 ⁇ 0.71), a cross-sectional area equal to or larger than that of the internal valley portion 53 can be secured. Therefore, the equivalent strength can be ensured by the outer fitting valley portion 33 and the inner fitting valley portion 53.
- the cross-sectional area of the outer fitting valley portion 33 can be reduced to 97% (0.68 / 0.70 ⁇ 0.97) when designed based on the destruction of the inner fitting valley portion 53.
- the cross-sectional area of the external fitting valley portion 33 is proportional to the square of the plate thickness tb of the external fitting valley portion 33, the plate thickness tb of the external fitting valley portion 33 is the plate of the internal fitting valley portion 53. Even if the thickness is reduced to 0.94 times the thickness tp (0.97 2 ⁇ 0.94), a cross-sectional area equal to or larger than that of the internal valley portion 53 can be secured.
- the plate of the outer fitting valley portion 33 is larger than the plate thickness tp of the inner fitting valley portion 53 in each of the outer fitting step portion 4 and the inner fitting step portion 6.
- the thickness tb is reduced.
- the thickness of the outer fitting valley 33 closest to the second steel pipe pile 2 is greater than the thickness of the inner fitting valley 53 closest to the first steel pipe pile 1.
- the ratio obtained by dividing the plate thickness of the external fitting valley portion 33 closest to the second steel pipe pile 2 by the plate thickness of the internal fitting valley portion 53 closest to the first steel pipe pile 1 is 0.84 or more. .
- the joint structure 7 of a steel pipe pile can make the cross-sectional area of the external fitting end part 3 small, and can avoid an excessive design.
- the maximum compression, tension, and bending strength can be obtained with a small amount of weight and volume of steel.
- the weight and volume of the entire joint can be reduced to improve the efficiency of the connection work, and an increase in the material cost of the entire joint can be suppressed.
- the joint structure 7 of the steel pipe pile which concerns on this embodiment is the external fitting step part 4 of the base end side B in the external fitting step part 4 adjacent to the axial direction Y, as shown in FIG. 8, FIG.
- the plate thickness of the external fitting valley portion 33 is larger than the plate thickness of the external fitting valley portion 33 at the external fitting step portion 4 on the distal end side A.
- the thickness of the inner fitting valley portion 53 in the inner fitting step 6 on the base end side B is the same as that in the inner fitting step 6 on the distal end side A. It is larger than the plate thickness of the inner fitting valley portion 53.
- the protrusion height Hc of the compression surface 31 b of the outer fitting mountain portion 31 and the compression surface 51 b of the inner fitting mountain portion 51 is the protrusion height of the tensile surface 31 a of the outer fitting mountain portion 31 and the tensile surface 51 a of the inner fitting mountain portion 51. Is greater than Ht. Further, in the first outer fitting step portion 41 and the first inner fitting step portion 61, the second outer fitting step portion 42, the fourth outer fitting step portion 44, and the second inner fitting step portion 62 to the fourth inner fitting step portion. 64, the protrusion height Hc of the compression surface 31b of the outer fitting mountain portion 31 and the compression surface 51b of the inner fitting mountain portion 51 is increased. Thereby, in each of the outer fitting end part 3 and the inner fitting end part 5, it has the characteristic that a compression yield strength becomes larger than a tensile yield strength.
- the ratio of Hc to Ht is Ht ⁇ 0.5 ⁇ Hc, as shown in FIG. Hc is very large compared to.
- the compressive strength is tensile. More than twice the yield strength. Therefore, in the conventional joint structure 9 of a steel pipe pile, when the tensile strength of the entire joint is equal to or higher than that of the steel pipe pile, the compression strength of the whole joint is more than twice that of the steel pipe pile. Since a general steel pipe pile has the same tensile strength and compression strength, the conventional steel pipe pile joint structure 9 has a drawback that the compression strength is excessively designed.
- the steel pipe pile joint structure 7 includes an outer fitting mountain portion 31 and an inner fitting mountain portion 51 in each of the outer fitting step portion 4 and the inner fitting step portion 6.
- the ratio of the protrusion height Ht of the tension surface 31a and the tension surface 51a of the outer fitting mountain portion 31 and the inner fitting mountain portion 51 to the projection height Hc of the compression surface 31b and the compression surface 51b is 0.5 or more and 0.9. It becomes as follows. At this time, in the joint structure 7 of the steel pipe pile, the protruding height Ht is smaller than the protruding height Hc, and each outer fitting step 4 and inner fitting from the distal end side A to the proximal end side B in the axial direction.
- the step portion 6 is formed in a substantially tapered shape in the axial direction Y.
- the joint structure 7 of a steel pipe pile can reduce the protrusion height Ht by making the protrusion height Ht smaller than the protrusion height Hc and making the tensile strength of the entire joint equal to the compression strength.
- it since it can suppress that a compressive proof stress becomes an excessive design, compared with the joint structure 9 of the conventional steel pipe pile, it becomes possible to reduce the steel material weight of the whole joint.
- FIG. 16 the result of having compared the joint thickness ratio with the joint structure 7 of the steel pipe pile which concerns on this embodiment, and the joint structure 9 of the conventional steel pipe pile is shown.
- the ratio of Hc to Ht Ht / Hc
- Ht / Hc the ratio of Hc to Ht
- the ratio is taken as the vertical axis.
- the joint thickness ratio when Ht 0.5 ⁇ Hc (corresponding to the examples 2, 9, and 16 in Table 3) and the tensile strength and compression strength equivalent to those of conventional steel pipe piles.
- the value is a reference value
- the value of the joint thickness ratio on the vertical axis is 1.
- the joint thickness is h (corresponding to D in FIG. 5), the plate thickness tp4 of the internal fitting valley portion 53 in the fourth internal fitting step portion 64, and the plate thickness of the external fitting valley portion 33 in the first external fitting step portion 41.
- the total value of tb1 and a predetermined clearance CL is adopted.
- the steel pipe pile joint structure 7 is a conventional steel pipe pile joint structure 9 in SKK400, SKK490 or SM570, particularly in the range of 0.5 ⁇ Hc ⁇ Ht ⁇ 0.9 ⁇ Hc.
- the joint thickness ratio is smaller than Thereby, it turns out that the weight of the whole coupling becomes small.
- the joint thickness ratio is 5.0% compared to the conventional steel pipe pile joint structure 9. The degree can also be reduced. As a result, the weight of the entire joint after processing can be reduced by about 3.5 to 4.0%.
- the joint thickness ratio can be reduced by about 10%.
- the joint thickness ratio can be reduced by about 10%.
- the joint structure 7 of the steel pipe pile reduces the protrusion height Hc by setting the ratio of the protrusion height Ht to the protrusion height Hc to 0.5 or more and 0.9 or less, and avoids excessive design of compression strength. it can.
- the maximum compressive strength, tensile strength, and bending strength can be obtained with a small amount of used weight and volume of steel.
- the weight and volume of the entire joint can be reduced to improve the efficiency of the connection work, and an increase in the material cost of the entire joint can be suppressed.
- the external fitting mountain part 31 is based on the protruding height Hc of the external fitting mountain part 31 that is relatively close to the second steel pipe pile 2.
- the ratio obtained by dividing the projecting height Ht of the other external fitting mountain portion 31 adjacent to each other is 0.5 or more and 0.9 or less, and each of the internal fitting mountain portions 51 is relatively first.
- the ratio obtained by dividing the projection height Ht of the other internal fitting mountain portion 51 adjacent to the internal fitting mountain portion 51 by the projection height Hc of the internal fitting mountain portion 51 close to the steel pipe pile 1 is 0.5 or more. 0.9 or less.
- Ht ⁇ Dp / 250 as a lower limit value of the protrusion height Ht. It is desirable to do.
- the plate of the outer fitting valley portion 33 located closest to the outer fitting tip side with respect to the plate thickness of the inner fitting valley portion 53 located closest to the inner fitting tip side By reducing the thickness and defining the ratio of these plate thicknesses, it is possible to reduce the weight of the joint while ensuring a desired strength. Therefore, the joint weight of the steel pipe pile can be reduced, and workability is improved.
- Second Embodiment The second embodiment of the present invention will be described below, but basically corresponds to a modified example of the first embodiment. Therefore, the second embodiment of the present invention will be described using the same reference numerals as those used in the first embodiment. Is omitted. That is, this embodiment is basically the same configuration as the first embodiment, but the second steel pipe pile 2 is the most in accordance with the thickness of the inner valley portion 53 closest to the first steel pipe pile 1. The ratio obtained by dividing the plate thickness of the close fitting valley portion 33 is 0.84 or more and 0.94 or less.
- the first inner fitting is based on the diameter-thickness ratio (Dp / tb1) between the outer diameter Dp of the conventional steel pipe pile and the plate thickness tb1 of the outer fitting valley portion 33 in the first outer fitting step portion 41.
- the plate thickness ratio of the internal fitting valley part 53 and the external fitting valley part 33 is 0.94 or more, and there is almost no difference between the conventional structure.
- the weight can be preferably reduced, so that the plate thickness ratio is more preferably 0.84 or more and 0.94 or less.
- the thickness of the outer fitting end portion 3 having a larger influence on the joint weight than the inner fitting end portion 5 can be obtained by setting the ratio of the plate thickness within the above range. It can be made smaller, and the weight of the entire joint can be further reduced. Therefore, it is possible to further reduce the weight of the steel pipe pile joint.
- the ratio obtained by dividing the protrusion height of the other external fitting mountain part 31 adjacent to the external fitting mountain part 31 by the projection height is 0.6 or more and 0.8 or less, and each internal fitting mountain part 51, the ratio obtained by dividing the protrusion height of the other internal fitting mountain portion 51 adjacent to the internal fitting mountain portion 51 by the protruding height of the internal fitting mountain portion 51 that is relatively close to the first steel pipe pile 1. 0.6 or more and 0.8 or less.
- the ratio of the protruding height of the ridge portion on the proximal end side to the protruding height of the ridge portion on the distal end side is within the above range, so that it is parallel to the axis L. A sufficient strength in any direction can be ensured. Therefore, the weight of the steel pipe pile joint can be reduced while maintaining the strength of the steel pipe pile joint.
- the joint structure 7 of the steel pipe pile which concerns on each said embodiment cuts the edge part of the 1st steel pipe pile 1 and the 2nd steel pipe pile 2, and is the edge part of the 1st steel pipe pile 1 or the 2nd steel pipe pile 2
- the outer fitting end 3 or the inner fitting end 5 may be provided in itself.
- the first steel pipe pile 1 may be provided with the inner fitting end 5
- the second steel pipe pile 2 may be provided with the outer fitting end 3.
- the joint structure of a steel pipe pile according to the present invention can reduce the joint weight while ensuring a desired strength. Therefore, the joint weight of the steel pipe pile can be reduced, and a steel pipe pile with improved workability can be provided. Therefore, the present invention has high industrial applicability.
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Abstract
Description
本願は、2015年11月27日に日本に出願された特願2015-231400号に基づき優先権を主張し、その内容をここに援用する。
本実施形態に係る鋼管杭の継手構造7は、地滑り杭、支持杭又は摩擦杭等に利用されるものであり、図1に示すように、断面略円形状等の第1鋼管杭1と第2鋼管杭2とを軸芯方向Yに連結する。
なお、図3、図5、図8から図13、図16の断面図については、図を見やすくするために、ハッチングを省略している。
即ち、本実施形態に係る鋼管杭の継手構造7においては、第1鋼管杭1に最も近い内嵌谷部53の板厚よりも、第2鋼管杭2に最も近い外嵌谷部33の板厚の方が小さく、かつ、第1鋼管杭1に最も近い内嵌谷部53の板厚によって、第2鋼管杭2に最も近い外嵌谷部33の板厚を除算した比率が0.84以上である。
ここで、図13の(a)に示すように、本実施形態に係る鋼管杭の継手構造7では、第1鋼管杭1に最も近い内嵌谷部53の板厚よりも、第2鋼管杭2に最も近い外嵌谷部33の板厚の方が小さい。これに対して、図13の(b)に示されるような従来の鋼管杭の継手構造9では、第1鋼管杭1に最も近い内嵌谷部53の板厚と、第2鋼管杭2に最も近い外嵌谷部33の板厚とが同一である。図13の(c)は、図13の(a)と図13の(b)との比較を示す図である。図13の(c)では、図13の(b)の従来の鋼管杭の継手構造9が点線で示されている。これによると、本実施形態に係る鋼管杭の継手構造7の方が、特に外嵌端部3の全体の厚みが低減されていることがわかる。
継手を適用する鋼管杭の範囲は、外径Dpを400.0mm~1600.0mm、鋼管杭の板厚tpを6.0mm~30.0mmとした。材料規格は、JIS A 5525に規定されるSKK40とJIS G 3106に規定されるSM570である。図14のグラフは、接合する鋼管杭の外径Dpと板厚tpとの径厚比(Dp/tp) を横軸として、FEM解析で算出された本実施形態に係る鋼管杭の継手構造7の最大曲げモーメントMmax(継手部分)と鋼管杭の全塑性曲げモーメントMp(鋼管部分)との比率(Mmax/Mp)を縦軸としている。図14からは、外嵌端部3の板厚tbを低減させた場合でも、継手の最大曲げモーメントMmaxが、接合する鋼管の全塑性曲げモーメントMpを上回ることがわかる。また、継手は鋼管より強いため、本継手は鋼管に先行して破壊することは無いことがわかる。表1に、図14の数値データを示す。
図15Aによると、内嵌端部5においては、径厚比が変化した場合に耐力比も変化するため、耐力比が径厚比の一次関数となることがわかる。これに対して、図15Bによると、外嵌谷部33においては、耐力比が径厚比によらず一定となることがわかる。なお、図15A及び図15Bでも、鋼管杭の外径Dpを400.0mm~1600.0mm、鋼管杭の板厚tを6.0mm~30.0mmとした範囲で、鋼管杭の通常の材料規格の下限値としてJIS A 5525に規定されるSKK400を示すとともに、材料規格の上限値としてJIS G 3106に規定されるSM570を示している。表2に、図15A及び図15Bの数値データを示す。
このことから、径厚比が200.00となる範囲で、内嵌谷部53の破壊を基準として設計すると、外嵌谷部33の断面積を71%(0.50/0.70≒0.71)まで低減できる。このため、外嵌谷部33の断面積は、外嵌谷部33の板厚tbの2乗と比例関係にあることから、外嵌谷部33の板厚tbが内嵌谷部53の板厚tpの0.84倍まで低減しても(0.842≒0.71)、内嵌谷部53と同等以上の断面積を確保できる。よって、外嵌谷部33と内嵌谷部53とで同等の耐力を確保することができる。径厚比50程度では、内嵌谷部53の破壊を基準として設計すると、外嵌谷部33の断面積を97%(0.68/0.70≒0.97)まで低減できる。このため、外嵌谷部33の断面積は、外嵌谷部33の板厚tbの2乗と比例関係にあることから、外嵌谷部33の板厚tbが内嵌谷部53の板厚tpの0.94倍まで低減しても(0.972≒0.94)、内嵌谷部53と同等以上の断面積を確保できる。
さらに、第1外嵌段部41及び第1内嵌段部61では、第2外嵌段部42第4外嵌段部44、及び、第2内嵌段部62~第4内嵌段部64より、外嵌山部31の圧縮面31b及び内嵌山部51の圧縮面51bの突出高さHcが大きくなる。これにより、外嵌端部3及び内嵌端部5の各々において、引張耐力より圧縮耐力が大きくなる特徴を有する。
これにより、鋼管杭の継手構造7は、突出高さHcに対する突出高さHtの比率を、0.5以上、0.9以下として、突出高さHcを低減させて圧縮耐力の過剰設計を回避できる。これにより、従来の鋼管杭の継手構造9と比較して、少ない重量及び体積の鋼材等の使用量で、最大の圧縮と引張と曲げの耐力が得られる。その結果、継手全体の重量、体積を低減させて連結作業の効率を向上させるとともに、継手全体の材料コストの上昇を抑制することが可能となる。
本発明の第2実施形態について以下に説明するが、基本的に上記第1実施形態の変形例に相当するので、上記第1実施形態で用いた符号と同一の符合を用いて説明し、図示は省略する。
すなわち、本実施形態は、基本的には、上記第1実施形態と同様の構成であるが、第1鋼管杭1に最も近い内嵌谷部53の板厚によって、第2鋼管杭2に最も近い外嵌谷部33の板厚を除算した比率が、0.84以上、0.94以下である。
(tb1/tp1)=0.99-0.001×(Dp/tb1)…(式1)
本発明の第3実施形態について以下に説明するが、基本的に上記第1実施形態の変形例に相当するので、上記第1実施形態で用いた符号と同一の符合を用いて説明し、図示は省略する。
すなわち、本実施形態は、基本的には、上記第1実施形態と同様の構成であるが、各々の外嵌山部31において、相対的に第2鋼管杭2に近い外嵌山部31の突出高さにより、当該外嵌山部31の隣にある他の外嵌山部31の突出高さを除算した比率が、0.6以上、0.8以下であり、各々の内嵌山部51において、相対的に第1鋼管杭1に近い内嵌山部51の突出高さにより、当該内嵌山部51の隣にある他の内嵌山部51の突出高さを除算した比率が、0.6以上、0.8以下である。
2 :第2鋼管杭
3 :外嵌端部
31 :外嵌山部
31a:引張面
31b:圧縮面
32 :外嵌溝部
33 :外嵌谷部
38 :外嵌余長部
4 :外嵌段部
41 :第1外嵌段部
42 :第2外嵌段部
43 :第3外嵌段部
44 :第4外嵌段部
5 :内嵌端部
51 :内嵌山部
51a:引張面
51b:圧縮面
52 :内嵌溝部
53 :内嵌谷部
58 :内嵌余長部
6 :内嵌段部
61 :第1内嵌段部
62 :第2内嵌段部
63 :第3内嵌段部
64 :第4内嵌段部
7 :鋼管杭の継手構造
A :先端側
B :基端側
L :軸芯線
W :周方向
X :軸芯直交方向
Y :軸芯方向
Claims (3)
- 外嵌端部を有する第1鋼管杭と内嵌端部を有する第2鋼管杭とが、前記外嵌端部と前記内嵌端部とにおいて同一の軸芯線を共有した状態で連結された鋼管杭の継手構造であって、
前記軸芯線に沿って断面視した場合に:
前記外嵌端部の内側の、前記軸芯線に沿った複数位置に、前記第2鋼管杭に向かって段階的に拡径するように外嵌段部が設けられ、
各々の前記外嵌段部が、相対的に前記第2鋼管杭に近い外嵌山部と、当該外嵌山部に隣接する外嵌谷部とを有し;
前記内嵌端部の外側の、前記軸芯線に沿った複数位置に、前記第1鋼管杭に向かって段階的に縮径するように内嵌段部が設けられ、
各々の前記内嵌段部が、相対的に前記第1鋼管杭に近い内嵌山部と、当該内嵌山部に隣接する内嵌谷部とを有し、
各々の前記内嵌山部が、前記外嵌端部内に前記内嵌端部を挿入して前記軸芯線回りに相対回転させた状態で、各々の前記外嵌山部に対して係止され;
各々の前記外嵌山部において、相対的に前記第2鋼管杭に近い前記外嵌山部の突出高さにより、当該外嵌山部の隣にある前記外嵌山部の突出高さを除算した比率が、0.5以上、0.9以下であり、
各々の前記内嵌山部において、相対的に前記第1鋼管杭に近い前記内嵌山部の突出高さにより、当該内嵌山部の隣にある前記内嵌山部の突出高さを除算した比率が、0.5以上、0.9以下であり、
前記第1鋼管杭に最も近い前記内嵌谷部の板厚よりも、前記第2鋼管杭に最も近い前記外嵌谷部の板厚の方が小さく、かつ、前記第1鋼管杭に最も近い前記内嵌谷部の板厚によって、前記第2鋼管杭に最も近い前記外嵌谷部の板厚を除算した比率が、0.84以上である;
ことを特徴とする鋼管杭の継手構造。 - 前記第1鋼管杭に最も近い前記内嵌谷部の板厚によって、前記第2鋼管杭に最も近い前記外嵌谷部の板厚を除算した比率が、0.84以上、0.94以下である
ことを特徴とする請求項1に記載の鋼管杭の継手構造。 - 各々の前記外嵌山部において、相対的に前記第2鋼管杭に近い前記外嵌山部の突出高さにより、当該外嵌山部の隣にある前記外嵌山部の突出高さを除算した比率が、0.6以上、0.8以下であり、
各々の前記内嵌山部において、相対的に前記第1鋼管杭に近い前記内嵌山部の突出高さにより、当該内嵌山部の隣にある前記内嵌山部の突出高さを除算した比率が、0.6以上、0.8以下であり、
ことを特徴とする請求項1又は2に記載の鋼管杭の継手構造。
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MYPI2018701568A MY192569A (en) | 2015-11-27 | 2016-11-17 | Joint structure for steel pipe pile |
AU2016360218A AU2016360218B2 (en) | 2015-11-27 | 2016-11-17 | Joint structure for steel pipe pile |
CN201680066850.9A CN108291376B (zh) | 2015-11-27 | 2016-11-17 | 钢管桩的接头结构 |
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JP2000234333A (ja) * | 1998-12-15 | 2000-08-29 | Kubota Corp | 鋼管矢板等の縦継ぎ装置 |
JP2001182052A (ja) * | 1999-12-24 | 2001-07-03 | Kubota Corp | 柱状体 |
JP2004225393A (ja) * | 2003-01-23 | 2004-08-12 | Jfe Steel Kk | 鋼管の接合構造及び接合方法 |
JP2006283314A (ja) * | 2005-03-31 | 2006-10-19 | Jfe Steel Kk | 地すべり抑止用鋼管杭の継手構造及びこれを備えた地すべり抑止用鋼管杭 |
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