JP2008069611A - Joint structure of steel pipe joint and steel pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint of a steel pipe such as a steel pipe pile, joining upper and lower steel pipe piles without welding at the construction site by simple work. <P>SOLUTION: This joint 3 includes an outer joint 31 and an inner joint 32, wherein a plurality of equilateral pentagonal connecting projections 315 are disposed on a raised face 3,142 of a tray-like recessed part 314 of a tray-like connecting part 311 of the outer joint 31. The connecting projections 325 of the same number as that of the connecting projections 315 are disposed on the peripheral surface of a cylindrical connecting part 321 of the inner joint 32. When the inner joint 32 is rotated with the cylindrical connecting part 321 inserted in the tray-like recessed part 314, the connecting projections 325 are pressed in between the connecting projections 315 and the base 3,141, so that the outer joint 31 and the inner joint 32 are connected to each other with slant faces of both connecting projections in contact with each other. The outer joint 31 and the inner joint 32 are fitted with a lower steel pipe pile 11 and an upper steel pipe pile 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a steel pipe joint such as a steel pipe pile, a steel pipe column, a steel pipe joint for transporting liquid or gas, and a steel pipe joint structure using the joint of the steel pipe.

Conventionally, joints are used for joining steel pipes such as steel pipe piles. A conventional steel pipe pile joint and a steel pipe pile joint structure using the joint will be described with reference to FIG.
FIG. 8A is an example in which the upper and lower steel pipe piles 11 and 12 are joined using the abutment 23, and the abutment 23 is formed of a cylindrical steel pipe whose outer diameter is slightly smaller than the inner diameters of both the steel pipe piles. The metal wire 24 is penetrated in a direction orthogonal to the axial direction. The metal 23 is inserted into both the steel pipe piles 11 and 12 and is held between the steel pipe piles by the metal wire 24. In that state, the gap 10 between the steel pipe piles 11 and 12 is welded to join both steel pipe piles (see Patent Document 1).
FIG. 8B shows an example in which the upper and lower steel pipe piles 11 and 12 are joined using a screw-type joint. A male threaded joint 21 is attached to the lower steel pipe pile 11, and a female threaded joint 22 is attached to the upper steel pipe 12. A female threaded joint 22 is screwed into the male threaded joint 21 to join both steel pipe piles (see Patent Document 2).

Japanese Patent Laid-Open No. 2005-282015 JP-A-2001-64959

When the joint shown in FIG. 8 (a) is used, the upper and lower steel pipe piles must be welded at the construction site of the steel pipe pile, but welding at the construction site must bring welding materials, etc. to the construction site, rain, etc. Since the pile driving operation must be stopped while the upper and lower piles are welded, the work efficiency is poor and the welding quality may not be sufficient.
On the other hand, when the joint of FIG. 8B is used, in order to screw the male screw joint and the female screw joint, the positions of the male screw and the female screw must be exactly matched, but the alignment is not easy. In particular, it will be a difficult task at construction sites with poor scaffolding. Also, when screwing a male threaded joint and a female threaded joint, the upper steel pipe pile must be rotated many times and the female thread must be screwed into the male thread, and care must be taken not to clog mud etc. .
In view of the above-described problems of conventional joints, the present invention has an object to provide a steel pipe joint and a steel pipe joint structure that can easily join steel pipes such as steel pipe piles without welding at construction sites such as steel pipe piles. And

In order to achieve the object of the present invention, the steel pipe joint according to claim 1 is composed of an outer joint and an inner joint, and the outer joint includes a basin-shaped coupling portion coupled to the inner joint and a steel pipe mounting portion. The basin-shaped coupling part includes a basin-shaped concave part having a circular bottom surface and a peripheral vertical surface, and a plurality of coupling protrusions are provided on the vertical surface of the basin-shaped concave part, and the inner joint is a cylindrical joint that is coupled to the outer joint. And a steel pipe mounting portion, and the same number of coupling projections as the outer joint coupling projections are provided on the peripheral surface of the cylindrical coupling portion, and the coupling projections of the outer coupling when the inner coupling rotates It is provided in the position which press-fits between the bottom face of a basin-shaped recessed part.
The steel pipe joint according to claim 2 includes an outer joint and an inner joint, and the outer joint includes a basin-shaped coupling portion and a steel pipe mounting portion coupled to the inner joint, and the basin-shaped coupling portion includes a circular bottom surface and a peripheral portion. Provided with a plurality of coupling protrusions on the upper surface of the basin-shaped recess, and the inner joint includes a cylindrical coupling portion coupled to the outer coupling and a steel pipe mounting portion, and a cylindrical coupling portion. The same number of coupling projections as the coupling projections of the outer joint are provided on the peripheral surface of the outer joint, and the coupling projections of the inner coupling are wedges that engage with the coupling projections of the outer coupling.
The steel pipe joint according to claim 3 is the steel pipe joint according to claim 1, wherein the coupling protrusions on the upright surface and the coupling protrusions on the peripheral surface of the cylindrical coupling part are provided in a plurality of rows above and below, respectively. Two or more rows of coupling projections on the peripheral surface of the cylindrical coupling portion are press-fitted between the coupling projections on the rising surface.
The steel pipe joint according to claim 4 is the steel pipe joint according to claim 2, wherein the coupling protrusions on the upper surface and the coupling protrusions on the peripheral surface of the cylindrical coupling part are provided in a plurality of rows in the vertical direction. It is characterized by.
The steel pipe joint according to claim 5 is the steel pipe joint according to any one of claims 1 to 4, wherein the outer joint joint protrusion and the inner joint joint protrusion are both regular pentagons. The vertices are provided so that their vertices face each other.
The steel pipe joint according to claim 6 is the steel pipe joint according to any one of claims 1 to 5, further comprising a loosening prevention member for coupling the outer joint and the inner joint. And
The steel pipe joint according to claim 7 is the steel pipe joint according to any one of claims 1 to 6, wherein the steel pipe attached to the steel pipe attachment portion is a steel pipe pile.
The steel pipe joint structure according to claim 8 includes a basin-shaped coupling portion and a steel pipe mounting portion coupled to the inner joint, and the basin-shaped coupling portion includes a basin-shaped concave portion including a circular bottom surface and a peripheral vertical surface. One steel pipe is attached to the steel pipe mounting portion of the outer joint having a plurality of coupling protrusions provided on the rising surface of the basin-shaped concave portion, and includes a cylindrical coupling portion and a steel pipe mounting portion for coupling with the outer joint. Attach the other steel pipe to the steel pipe mounting part of the inner joint, which has the same number of joint protrusions as the outer joint joint protrusion on the surface, and place the inner joint joint protrusion between the outer joint joint protrusion and the bottom of the basin-shaped recess. It is characterized by being press-fitted.
The steel pipe joint structure according to claim 9 is the steel pipe joint structure according to claim 8, wherein the steel pipe attached to the steel pipe attachment portion of the outer joint and the steel pipe attached to the steel pipe attachment portion of the inner joint are steel pipe piles. It is characterized by.

The steel pipe joint of the present invention has a simple structure and is easy to manufacture because only the coupling protrusion is provided on the outer joint and the inner joint. Further, since the coupling protrusions of the outer joint and the inner joint overlap with each other in the axial direction of the joint, the outer diameter of the joint does not become so large even if the coupling protrusion is provided. In the steel pipe joint of the present invention, the inner joint coupling protrusion is inserted between the outer joint coupling protrusions, and the inner joint can be coupled by simply rotating the inner joint. Both joints can be joined, and steel pipes can be joined at the joining site of steel pipes without requiring high-precision positioning as in conventional threaded joints, for example.
Since the joint of the steel pipe of the present invention can join the outer joint and the inner joint simply by press-fitting the joint protrusion of the inner joint between the joint protrusion of the outer joint and the bottom surface of the basin-shaped recess, when joining the steel pipe, There is no need to weld at the construction site. Therefore, the joining operation of the steel pipe is simplified and the joining time can be shortened.

  Since the coupling protrusion of the inner joint of the present invention functions as a wedge that engages with the coupling protrusion of the outer joint, the coupling protrusion of the inner joint is inserted between the coupling protrusions of the outer joint, The outer joint and the inner joint can be coupled only by slightly rotating the inner joint until it is press-fitted between the coupling protrusion of the outer joint and the bottom surface of the basin-shaped recess. That is, it is not necessary to rotate and screw the inner joint many times as in the conventional threaded joint. Therefore, the joining work of the steel pipe is simplified and can be joined in a short time.

Since the steel pipe joint of the present invention uses a regular pentagonal shape for the coupling protrusions of the outer joint and the inner joint, when the two joints are joined, they can be joined by rotating the inner joint in either the left or right direction. That is, the coupling protrusion of the inner joint functions as a wedge in both the left and right directions. Therefore, the joining operation of the steel pipe is simplified.
Since the steel pipe joint of the present invention includes the loosening prevention member, it is possible to prevent loosening of the coupling between the outer joint and the inner joint after joining the steel pipe.
Since the steel pipe joint structure of the present invention joins the upper and lower steel pipes using the steel pipe joint of the present invention, the joining operation is simplified and the joining time can be shortened.

  An embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is used for the part common to each figure.

FIG. 1 is a view showing a joining structure of steel pipe piles in which upper and lower steel pipe piles are joined by a joint of steel pipe piles, FIG. 1 (a) is a side view, and FIG. 1 (b) is X11 in FIG. 1 (a). FIG. 1C is a cross-sectional view of the portion in the arrow direction, and FIG. 1C is a cross-sectional view of the X13 portion in FIG.
The upper steel pipe pile 11 and the lower steel pipe pile 12 are joined by the joint 3. The joint 3 includes an outer joint 31 and an inner joint 32 (the structures of both joints will be further described with reference to FIGS. 2 and 3).
The outer joint 31 includes a tray-like joint portion 311 that is joined to the inner joint 32 and a steel pipe pile attachment portion 313 that is inserted into the lower steel pipe pile 12. The basin-shaped coupling portion 311 includes a circular basin-shaped concave portion 314 that receives the cylindrical coupling portion 321 of the inner joint 32, and the basin-shaped concave portion 314 includes a circular bottom surface 3141 and a peripheral rising surface 3142. The inner joint 32 includes a circular cylindrical coupling portion 321 that is inserted into the tray-shaped recess 314 and a steel pipe pile attachment portion 323 that is inserted into the upper steel pipe pile 11.

A plurality of coupling protrusions 315 are provided at a predetermined interval on the rising surface 3142 of the basin-shaped recess 314, and the same number of coupling protrusions 325 as the coupling protrusions 315 are connected to the coupling protrusions 315 on the peripheral surface of the cylindrical coupling part 321. It is provided at the same interval. The coupling protrusion 315 and the coupling protrusion 325 are disposed along substantially the same upper and lower circumferences. That is, the coupling protrusion 315 and the coupling protrusion 325 are arranged along two upper and lower circumferences so as to overlap with each other in the axial direction of the joint 3. The coupling protrusion 315 and the coupling protrusion 325 are regular pentagons, and are arranged so that the respective apexes face each other and the inclined surfaces face each other. The outer joint 31 and the inner joint 32 are coupled with the inclined surfaces of both coupling protrusions in contact with each other.
When the lower steel pipe pile 11 and the upper steel pipe pile 12 are joined by the joint 3, the coupling protrusion 325 is press-fitted between the coupling protrusion 315 and the bottom surface 3141 of the basin-shaped recess 314 as shown in FIG. 315. In other words, the coupling protrusion 325 functions as a wedge that engages with the coupling protrusion 315.

The distance (interval) between the rising surface 3142 of the tray-shaped recess 314 and the cylindrical coupling portion 321 is larger than the thickness of the coupling projections 315 and 325, and the coupling projection 315, the cylindrical coupling portion 321, and the coupling projection 325 stand up. The upper surface 3142 is set so as not to contact. The distance (interval) between the rising surface 3142 of the basin-shaped recess 314 and the cylindrical coupling portion 321 may be slightly larger than the thickness of the coupling protrusion 315 or the coupling protrusion 325. The outer diameter of 3 is not so large.
The coupling protrusions 315 and the coupling protrusions 325 in FIG. 1B are arranged in one row on the circumferential surface of the cylindrical coupling portion 321 and the rising surface 3142, but in two rows as shown in FIG. You can also. That is, the coupling protrusions 3151 and 3152 are disposed above and below the peripheral surface of the cylindrical coupling portion 321, and the coupling protrusions 3251 and 3522 are disposed above and below the rising surface 3142. The coupling projection 3151 is press-fitted between the coupling projection 3251 and the bottom surface 3141 of the tray-shaped recess 314, and the coupling projection 3152 is press-fitted between the coupling projection 3251 and the coupling projection 3252 to couple the outer joint 31 and the inner joint 32. . In this case, even if the thickness of the coupling protrusions 3151 and 3152 and the coupling protrusions 3251 and 3252 is half that of the coupling protrusion 315 and the coupling protrusion 325 in FIG. 1B, the same degree of coupling as in FIG. Strength can be obtained. When the thicknesses of the coupling protrusions 3151 and 3152 and the coupling protrusions 3251 and 3252 are reduced, the outer diameter of the joint 3 can be made smaller than that in the case of FIG. The coupling protrusions 3151 and 3152 and the coupling protrusions 3251 and 3252 may be provided in two or more rows.
The end portion of the upper steel pipe pile 11 is in contact with the shoulder portion 322 of the cylindrical coupling portion 321 and the contact portion is welded. The end portion of the lower steel pipe pile 12 is in contact with the shoulder portion 312 of the basin-shaped connecting portion 311 and the contact portion is welded. Such welding can be performed in advance in a factory or the like before the steel pipe piles 11 and 12 are brought into the construction site. Therefore, the welding operation is efficient and high quality welding is possible.

FIG. 2 shows the structure of the outer joint.
2A is a plan view, FIG. 2B is a cross-sectional view of the X2 portion of FIG. 2A in the direction of the arrow, and FIG. 2C is an enlarged perspective view of the coupling protrusion.
A plurality (eight in the figure) of coupling protrusions 315 are provided at the same interval on the rising surface 3142 of the tray-shaped recess 314. The distance (interval) between the coupling projection 315 and the bottom surface 3141 of the basin-shaped recess 314 is such that when the coupling projection 325 of the inner joint 32 is press-fitted between the coupling projection 315 and the bottom surface 3141, a clamping force is applied to both coupling projections. The size is set. The coupling protrusion 315 is a regular pentagon (a shogi piece shape) having a thickness (the size of the basin-shaped recess 314 in the diameter direction), and is provided so that the apex is on the bottom surface 3141 side. The coupling protrusion 315 may be manufactured independently and attached to the rising surface 3142 by welding or the like, or may be manufactured integrally with the outer joint 31 by casting or the like.
The cross section of the steel pipe pile mounting portion 313 of the inner joint 31 is circular, but can also be rectangular. In that case, the steel pipe pile 12 can use a square thing.

FIG. 3 shows the structure of the inner joint.
3 (a) is a plan view, FIG. 3 (b) is a side view in the direction of arrow X3 in FIG. 3 (a), and FIG. 3 (c) is a cross section in the direction of the arrow at X4 in FIG. 3 (a). FIG. 3D is an enlarged perspective view of the coupling protrusion.
A plurality of (eight) coupling protrusions 325 are provided on the peripheral surface of the cylindrical coupling portion 321. The number and interval of the coupling protrusions 325 are the same as those of the coupling protrusions 315. The distance between the upper part (pentagonal apex) of the coupling protrusion 325 and the bottom surface 324 of the cylindrical coupling part 321 is larger than the distance between the coupling protrusion 315 of the outer joint 31 and the bottom face 3141 of the basin-shaped recess 314, And the outer joint 31 (when the upper and lower steel pipe piles are joined), the coupling protrusion 325 is press-fitted between the coupling protrusion 315 and the bottom surface 3141 of the outer joint 31, and a tightening force is applied to both the coupling protrusions. Is set. That is, the size is set such that the coupling protrusion 325 engages with the coupling protrusion 315 and functions as a wedge.

The coupling protrusion 325 is a regular pentagon (a shogi piece shape) having a thickness (the size of the cylindrical coupling portion 321 in the diameter direction), and is arranged so that the apex faces the coupling protrusion 315 side of the outer joint 31. The coupling protrusion 325 may be manufactured independently and attached to the peripheral surface of the cylindrical coupling portion 321 by welding or the like, or may be fabricated integrally with the inner joint 32 by casting or the like. The bottom surface of the coupling protrusion 325 in FIG. 3 is located higher than the bottom surface 324 of the cylindrical coupling portion 321, but the heights of both bottom surfaces may be the same.
The cross section of the steel pipe pile mounting portion 323 of the inner joint 32 is circular, but can also be rectangular. In that case, the steel pipe pile 11 can use a square thing.

FIG. 4 is a view for explaining how to join the outer joint and the inner joint.
The joint in FIG. 4A is the same as the outer joint 31 in FIG. 2A and the inner joint 32 in FIG. In FIG. 4, for the sake of easy understanding of the positional relationship between the coupling protrusions of the outer joint 31 and the inner joint 32, they are painted for convenience.
When the outer joint 31 and the inner joint 32 are coupled, first, as shown in FIG. 4 (b 1), the coupling protrusions 3251, 3252, 3253 of the inner coupling 32 are interposed between the coupling protrusions 3151, 3152, 3153 of the outer coupling 31. The cylindrical coupling part 321 is inserted into the basin-shaped recess 314 so as to be positioned. The positional relationship between the projections 3151, 3152, 3153 and the coupling projections 3251, 3252, 3253 at that time is as shown in FIG. The same applies to other coupling protrusions that are not provided with reference numerals. The coupling protrusions 3151, 3152, and 3153 and the coupling protrusions 3251, 3252, and 3253 have substantially the same circumference as shown in FIG. 4B1, and are arranged as shown in FIG. 4B2 along the upper and lower circumferences.

When the inner joint 32 is rotated in the direction of the arrow 5 in the state of FIG. 4B1, the coupling protrusions 3251, 3252, and 3253 are coupled to the coupling protrusions 3151, 3152, and 3153 and the tray-shaped recess 314 as illustrated in FIG. 4C1. The outer joint 31 and the inner joint 32 are joined with each other by press-fitting between the bottom surfaces 3141. The positional relationship between the coupling protrusions 3151, 3152, 3153 and the coupling protrusions 3251, 3252, 3253 at that time is as shown in FIG. 4 (c 2), and both the coupling protrusions are coupled with the inclined surfaces in contact with each other. That is, the coupling protrusions 3251, 3252, 3253 have a function as wedges that engage with the coupling protrusions 3151, 3152, 3153.
The outer joint 31 and the inner joint 32 may be coupled by inserting the coupling protrusions 3251, 3252, 3253 between the coupling protrusions 3151, 3152, 3153 and slightly rotating the inner joint 32. Therefore, joining work of steel pipe piles can be easily performed without requiring highly accurate positioning at the construction site.

FIG. 5 shows the loosening prevention means for the outer joint and the inner joint.
FIG. 5 (a) shows a state where the loosening prevention member is inserted in the state of FIG. 4 (c1), FIG. 5 (b) shows the positional relationship between the coupling protrusion and the loosening prevention member of FIG. FIG. 5C shows an enlarged perspective view of the loosening prevention member.

In the state of FIG. 5A (corresponding to FIG. 4C1), a loosening prevention member (wedge member) 33 is inserted between the coupling protrusions 3150 and 3151 of the outer joint 31, and the coupling protrusion 3251 of the inner joint 32 is inserted. However, it prevents the inner joint 32 from returning to the left side in FIG. The place where the loosening prevention member 33 is inserted may be one, but if it is two or more places, loosening can be reliably prevented. Since the loosening prevention member 33 has only to be inserted between the coupling protrusions 3150 and 3151, the attaching operation is simple.
As shown in FIG. 5C, the loosening prevention member 33 has the same thickness as the coupling protrusion 3150 of the outer joint 31 and the coupling protrusion 3251 of the inner joint 32, and when inserted between the coupling protrusions 3150 and 3151, the tip thereof The portion is formed so as to come into contact with the coupling protrusion 3251.

  The shape of the loosening prevention member 33 is not limited to the shape of FIG. 5 (c), and may be a shape in which the tip portion comes into contact with the coupling protrusion of the inner joint 32 when inserted between adjacent coupling protrusions of the outer joint 31. That's fine. In addition, the loosening prevention member 33 is not inserted into the bottom surface 3141 of the basin-shaped recess of the outer joint 31 as shown in FIG. A hole may be formed in parallel, and the loosening prevention member 33 may be inserted into the hole so that the loosening prevention member 33 contacts the coupling protrusion 3251 of the inner joint 32.

FIG. 6 is a diagram for explaining the relationship between the inclination angle of the coupling protrusion of the outer joint and the inner joint and the looseness of the coupling of both joints.
In a state where the coupling protrusion 325 of the inner joint and the coupling protrusion 315 of the outer joint are in contact at an inclination angle θ, when a vertical tensile force (load) T is applied, the reaction force component of the tensile force T is N1, When the slip component is N2 and the friction coefficient of the coupling protrusion is μ, the condition that the coupling protrusion 315 does not slide on the inclined surface is as follows.
N2 ≦ μN1 (1)
It becomes. When this condition is satisfied, the coupling of the coupling protrusions 325 and 315 is not loosened.

  In FIG. 6, N1 = T cos θ, N 2 = T sin θ, and the friction coefficient μ when the material of the coupling protrusion is iron is 0.45 (μ = 0.45). When the inclination angle θ is obtained, θ ≦ 24.22 degrees.

Therefore, when the inclination angle θ is smaller than 24.22 degrees, the coupling of the coupling protrusions 325 and 315 is not loosened. The coupling protrusions 325 and 315 are less likely to loosen as the inclination angle θ decreases. However, as the inclination angle θ decreases, the width (size in the circumferential direction) of the coupling protrusions 315 and 325 increases. Is preferably 15 degrees or more.
Even when the inclination angle θ is smaller than 24.22 degrees, the loosening prevention member of FIG. 5 can be used to more reliably prevent loosening of the coupling protrusions 325 and 315.

With reference to FIG. 7, the shape of the coupling protrusion between the outer joint and the inner joint and the outer shape of both joints will be described.
When the coupling protrusion 315 of the outer joint and the coupling protrusion 325 of the inner joint are regular pentagons, the coupling protrusion 325 may move (rotate) in the X5 direction as shown in FIG. Even if it moves (rotates) in the X6 direction like this, it contacts the inclined surface of the coupling protrusion 315. That is, since the joint protrusion 325 of the inner joint has the function of a bidirectional wedge, the joining work of the steel pipe pile is simplified.

  The coupling protrusions of the outer joint and the inner coupling are not limited to regular pentagons, but are trapezoidal like the coupling protrusions 315a and 325a in FIG. 7B1, and rectangular as the coupling protrusions 315b and 325b in FIG. 7B2. It may be arranged such that the inclined surfaces of both coupling projections face each other. Since the coupling protrusions 325a and 325b of the inner joint are used as wedges, they may be provided with an inclined surface and the shape may be other than the above. 7 (b1) and 7 (b2) have an inclined surface longer than that of a regular pentagon, and therefore the strength and the coupling strength of the coupling projection are increased.

The coupling protrusions of the outer joint and the inner joint are desirably arranged so that both inclined surfaces face each other, but the inclined surface may be formed only on one of the coupling protrusions. For example, in FIGS. 7B1 and 7B2, the inclined surfaces are formed only on the coupling protrusions 325a and 325b, and the coupling protrusions 315a and 315b do not form the inclined surfaces and are only surfaces parallel to the bottom surface 3141 of the basin-shaped recess. But you can. In any case, the coupling protrusions 325a and 325b of the inner joint have a wedge function. However, when an inclined surface is formed only on one of the coupling protrusions, the coupling protrusions of the outer joint and the inner joint are in line contact, so that the contact area is reduced and the strength and coupling strength of the coupling protrusion are reduced.
Since the joint projection of the outer joint and the joint projection of the inner joint are joined using an inclined surface, they can be reversely rotated during the steel pipe pile joining work to uncouple both joints. It is also possible to uncouple the joint.

  In the joint 3 of FIG. 7C, a taper is provided on the shoulder portion 312 of the bonnet-like joint portion 311 of the outer joint 31 and the shoulder portion 322 of the tubular joint portion 321 of the inner joint 32. Since the bonnet-like connecting portion 311 of the outer joint 31 is thickened by the taper, the strength is increased, and the resistance is reduced when the steel pipe pile is driven downward by the taper.

  Although the said Example demonstrated the steel pipe pile, steel pipes, such as a steel pipe pillar, a steel pipe beam, a liquid, and a gas pipe for transportation other than a steel pipe pile, may be sufficient.

It is a figure which shows the state which joined the upper and lower steel pipe piles with the joint of the steel pipe pile which concerns on the Example of this invention. It is a figure which shows the structure of the outer joint of the joint of the steel pipe pile which concerns on the Example of this invention. It is a figure which shows the structure of the inner side coupling of the coupling of the steel pipe pile which concerns on the Example of this invention. It is a figure explaining the method of the coupling | bonding of the joint of the steel pipe pile which concerns on the Example of this invention. It is a figure which shows the loosening prevention means of the coupling of the steel pipe pile which concerns on the Example of this invention. It is a figure explaining the relationship between the inclination angle of the joint protrusion of the joint of the steel pipe pile which concerns on the Example of this invention, and the looseness of the joint of a joint. It is a figure explaining the shape of the joint protrusion of the joint of the steel pipe pile which concerns on the Example of this invention, and the external shape of a joint. It is a figure which shows the structure of the coupling of the conventional steel pipe pile.

Explanation of symbols

11 Upper steel pipe pile 12 Lower steel pipe pile 3 Joint 31 Outer joint 311 Basin coupling part 312 Shoulder part 313 Basin coupling part 311 Steel pipe pile attachment part 314 Basin-shaped concave part 3141 Bottom face 3142 Standing upper surface 315 Coupling protrusion 32 Inner joint 321 Cylindrical Joint part 322 Shoulder part 323 of tubular joint part 321 Steel pipe pile attachment part 324 Bottom face 325 Joint projection 33 Loosening prevention member

Claims (9)

  It consists of an outer joint and an inner joint, and the outer joint has a basin-shaped coupling part and a steel pipe mounting part that are coupled to the inner joint, and the basin-shaped coupling part has a basin-shaped recess composed of a circular bottom surface and a peripheral vertical surface, A plurality of coupling protrusions are provided on the rising surface of the basin-shaped concave portion, and the inner joint includes a cylindrical coupling portion coupled to the outer coupling and a steel pipe mounting portion, and a coupling projection of the outer coupling is provided on the peripheral surface of the cylindrical coupling portion. The same number of coupling projections are provided, and the coupling projection of the inner joint is provided at a position where it is press-fitted between the coupling projection of the outer coupling and the bottom surface of the basin-shaped recess when the inner coupling is rotated. Fittings.   It consists of an outer joint and an inner joint. A plurality of coupling protrusions are provided on the rising surface of the basin-shaped recess, and the inner joint includes a cylindrical coupling portion that couples with the outer coupling and a steel pipe mounting portion, and is the same as the coupling projection of the outer coupling on the peripheral surface of the cylindrical coupling portion. A steel pipe joint characterized in that a number of joint protrusions are provided, and the joint protrusion of the inner joint is a wedge that engages with the joint protrusion of the outer joint.   The steel pipe joint according to claim 1, wherein the coupling protrusions on the rising surface and the coupling protrusions on the circumferential surface of the cylindrical coupling part are provided in a plurality of rows in the vertical direction, and the coupling projections on the circumferential surface of the cylindrical coupling part are provided. A steel pipe joint, wherein two or more rows of coupling protrusions are press-fitted between the coupling protrusions on the rising surface.   3. The steel pipe joint according to claim 2, wherein a plurality of rows of the coupling protrusions on the vertical surface and the coupling protrusions on the peripheral surface of the cylindrical coupling portion are provided in the vertical direction.   The steel pipe joint according to any one of claims 1 to 4, wherein the joint projection of the outer joint and the joint projection of the inner joint are regular pentagons and are provided so that the vertices of both faces each other. Characteristic steel pipe joint.   The steel pipe joint according to any one of claims 1 to 5, further comprising a loosening prevention member for coupling the outer joint and the inner joint.   The steel pipe joint according to any one of claims 1 to 6, wherein the steel pipe attached to the steel pipe attachment portion is a steel pipe pile.   It has a basin-shaped coupling part and a steel pipe mounting part that are coupled to the inner joint, and the basin-shaped coupling part has a basin-shaped concave part composed of a circular bottom surface and a peripheral vertical surface, and a plurality of coupling protrusions are provided on the vertical surface of the basin-shaped concave part. One steel pipe is attached to the steel pipe mounting part of the provided outer joint, and it has a cylindrical joint part and a steel pipe mounting part to be coupled with the outer joint, and the same number of joints as the joint projections of the outer joint are provided on the peripheral surface of the cylindrical joint part. The other steel pipe is attached to the steel pipe mounting portion of the inner joint provided with the protrusion, and the joint protrusion of the inner joint is press-fitted between the joint protrusion of the outer joint and the bottom surface of the basin-shaped recess. Construction.   The steel pipe joint structure according to claim 8, wherein the steel pipe attached to the steel pipe attachment portion of the outer joint and the steel pipe attached to the steel pipe attachment portion of the inner joint are steel pipe piles.

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