JP3747594B2 - Steel pipe pile joints - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a technology related to steel pipe piles in the field of civil engineering and construction, and is applied to, for example, steel pipe piles used for landslide countermeasures, steel pipe piles used for support piles, and relates to a steel pipe pile joining method and a steel pipe pile joint. .
[0002]
[Prior art]
For steel pipe piles for landslide prevention, bore holes are constructed in mountainous, sloped, and sloped areas where landslides may occur, steel pipe piles are inserted into the boreholes, and mortar is filled in the holes. Stabilize and connect the surface part that causes landslide to the deep part of the formation. Such steel pipe piles include those having a diameter of about 200 to 600 mm and a length of several tens of meters depending on the conditions of the construction site. Therefore, it is necessary to connect a plurality of steel pipe piles at the construction site.
[0003]
On the other hand, it may be necessary to construct a long support pile under narrow construction conditions such as in urban areas. In such a case, for example, there are cases where an aerial structure such as an overhead wire or a bridge already exists, or there are cases where a large number of short steel pipe piles must be connected and submerged under the roof.
Conventionally, butt-welded joints, welded joints using sleeves, threaded joints, flange joints, and the like are generally used as joints for steel pipe piles.
[0004]
Welded joints require a long time for welding, and it is becoming difficult to secure skilled welding workers, and there are problems that require X-ray inspection and the like. As an alternative joint, for example, Japanese Patent Publication No. 7-13368 discloses a conventional technique used for joining work on a taper screw joint in the field. Perform joint joining while confirming by visual inspection of field workers. There is also a simple jig that folds a round bar for centering the pile and hangs it on the head of the lower pile to guide the upper pile into the lower pile.
[0005]
Such taper screws are not easy to align the upper and lower piles, and require high-precision and careful setting of the upper and lower piles. Special considerations are required, and if the screws are not meshed, the work will be poor. Flange joints have a problem that the outer diameter increases, and it is possible to reduce the outer diameter of the pile end so that the outer diameter does not increase, but it is not easy to insert bolts or use a wrench, and it takes a long time for construction. Cost.
[0006]
Further, in JP-A-9-3875 and JP-A-9-132913, a threaded joint of a pile is provided with a guide cylinder on the female thread side, and a guide cylinder that enters the guide cylinder on the male thread side, The guide cylinder and the guide cylinder are fitted to match the pile shaft to achieve normal engagement of the screws. This technique requires a guide cylinder deeper than the length of the screw and a guide cylinder longer than the length of the screw.
[0007]
[Problems to be solved by the invention]
When the upper and lower steel pipe piles are joined on site using threaded joints, if the vertical accuracy of the lower pile is poor, the screws of the upper and lower piles do not mesh well even when using a jig, and the screw part is seized and damaged, It becomes construction failure. Moreover, a long time will be required for construction. If the screws are not completely engaged, a predetermined strength cannot be obtained, resulting in poor quality, and it is very difficult to take corrective measures.
[0008]
In the technique using a taper screw to match the axial center of this threaded joint, if the taper screw has an inclination in the mutual screw shaft at the beginning of meshing of the male screw and the female screw, a cross thread (difference in the thread) occurs. If the screw is tightened while tilted, the thread will be crushed and the joint performance will deteriorate.
The present invention solves the above problems, and develops and provides a steel pipe pile joint that can be easily centered in a short time and can be firmly and securely joined in field construction. With the goal.
[0009]
Another object of the present invention is to connect a plurality of short piles having a length of, for example, about 2 m under construction conditions restricted in an urban area or the like. The upper and lower piles can be easily centered and screwed in easily without damaging the threaded part during lifting, and it is easy to join and perform accurate pile driving. There is no joint to provide.
[0010]
[Means for Solving the Problems]
The present invention is characterized by taking the following technical means in order to solve the above problems.
The structure of the steel pipe pile joint according to the present invention is as follows. That is, each of the steel pipe pile ends is provided with a male cylinder having a male thread and a female cylinder having a female thread. The screw is a multi-threaded thread of three or more parallel threads, and is attached to the tip of the male cylinder. Provided is a steel pipe pile joint, wherein a cylindrical portion having an outer diameter loosely fitted to the inner diameter of the female screw is provided. The joint joint of the present invention is provided with a male and female threaded cylinder at the end of a steel pipe pile, and employs multi-threaded screws to facilitate centering of the steel pipe pile and quick coupling. Further, a cylindrical portion that is loosely fitted to the inner diameter of the female screw is provided on the tip side of the male screw of the male cylinder so as to automatically align the center. The outer diameter of the cylindrical portion is a size that fits loosely into the inner diameter of the female screw, and has an outer diameter that eliminates the threads of the male screw. Since the male thread is a multi-threaded thread, the start end of the male thread is present in the plane perpendicular to the screw axis by the number of the multi-threaded thread, and the female thread side is also within the same cross section perpendicular to the threaded axis. Since there are as many threads with the same phase as the number of threads, the beginning of meshing of the screw occurs at a number of positions, coupled with the effect that the cylindrical part is fitted to the inner diameter of the female thread and positioned, The shaft centers are easily matched and normal engagement of the screws is easily achieved.
[0011]
In this joint structure, the axial length of the cylindrical portion is not limited. This cylindrical part serves as a guide when connecting the upper and lower piles, and it is sufficient that there is a minimum dimension sufficient for the axis centers of the upper and lower piles to be aligned. , Easy to center. Such a pile is used when, for example, a long pile of several tens of meters is constructed by connecting a number of short piles having a length of about 2 m under the structure. Preferably used. In such a case, it may be desired to save labor for attaching and detaching a centering jig and the like, which is particularly effective in such a case.
[0012]
In the present invention, instead of the cylindrical portion, an inner cylindrical portion loosely fitted to the outer diameter of the male screw may be provided at the tip of the female side cylindrical body, and the effect of facilitating the centering is equivalent to the cylindrical portion. It is. Furthermore, in addition to the cylindrical portion, if an inner surface cylindrical portion that loosely fits to the outer diameter of the male screw is provided at the tip of the female side cylindrical body, alignment is further facilitated. In the steel pipe pile according to the present invention, when the upper pile is lifted and its lower end is brought into contact with the lower pile, the axis centers automatically coincide with each other, so that the labor of alignment is not required.
[0013]
Further, when an inner peripheral seat with which the tip of the cylindrical portion abuts is provided on the inner surface of the female cylindrical body, it serves as a stopper for screwing completion and contributes to tightening of the screw, and a large thrust transmission function in the axial direction Can be given. In addition, an outer peripheral seat on which the tip of the inner cylindrical portion abuts directly or via a water blocking rubber ring is provided on the outer surface of the male cylinder, and the stopper, screw tightening, thrust transmission action is applied, or It is preferable to provide a watertight seal characteristic.
[0014]
Also, such piles may need to be reversed during construction. Therefore, a set bolt for preventing loosening of the threaded joint is provided when the motor is reversed. Since long piles formed by connecting a large number of short piles have many joints, special consideration must be given to loosening of screws. The set bolt is provided with a set bolt mounting hole in the cylindrical wall of the female side cylindrical body, and the outer periphery of the cylindrical part of the male side cylindrical body is a concave hole into which the tip of the set bolt is fitted, or a circumferential headband-shaped concave groove, Alternatively, a long hole-like concave hole or groove along the cylindrical bus is provided. From the standpoint of sealing the inside and outside of the steel pipe pile, the recessed hole should not be a through hole. However, when it is not necessary to seal the inside and outside of the steel pipe pile, a through hole may be used instead of the concave hole.
[0015]
With this set bolt, it is possible to ensure the connection of the upper and lower piles and to easily provide the rotational torque transmission and thrust transmission functions between the upper and lower piles.
A pair of mounting holes for the set bolts may be provided symmetrically with respect to the center point of the cylindrical body, and N or more pairs of the concave holes may be arranged at equal intervals on the circumference with respect to the central point of the cylindrical body. N is the number of multi-threaded threads. For example, in the case of a three-thread screw, the number of recess holes is six or more even numbers, in the case of a four-thread screw, eight or more even numbers, and in the case of a five-thread screw, ten or more even numbers. By doing so, the male screw and female screw are fully screwed in, and then the screw is returned in the axial direction by a stroke less than half of the screw pitch, so that the position of the concave hole and the set bolt can be matched. It becomes easy to secure the processing accuracy by increasing the fitting dimension accuracy between the bolt and the recessed hole and the mutual arrangement position accuracy.
[0016]
Moreover, it can also utilize as a suspension hand at the time of handling a steel pipe pile by attaching an eyebolt to the mounting part of this set bolt. This eliminates the risk of damaging the screw when suspending a steel pipe pile having a joint screw. In addition, when attaching Yatco (an auxiliary tool temporarily installed on the pile head for hiring piles, pile driving, etc.) to the head of the steel pipe pile, it was made common so that it could be used as its mounting bolt hole. By designing, it can be used for multiple purposes.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. FIG. 1 (a) is a lower end hardware 20 which is a male cylinder attached to the lower end of the steel pipe pile of the present invention, and FIG. 1 (b) is an upper end of the steel pipe pile. In the upper end hardware 30 which is a female side cylinder to be attached, the left half is an external side view and the right half is a longitudinal sectional view. The lower end hardware 20 is made of an upper cylinder 21 and a lower cylinder 23 that are integrally formed vertically. The upper cylinder 21 has an outer diameter equal to the outer diameter of the steel pipe pile 100, and a groove 22 for welding joint 101 with the steel pipe pile 100 is provided at the upper end thereof. The lower cylinder 23 is formed with a male screw 24 that is screwed into the female screw 33 of the upper end hardware 30 of the lower pile 110. A cylindrical portion 25 whose outer diameter is the bottom diameter of the male screw 24 is formed at the tip of the male screw 24. When the upper steel pipe pile 100 and the lower steel pipe pile 110 are joined, the cylindrical portion 25 is loosely fitted to the inner diameter of the female thread 33 and guides the upper pile so that the axial centers of the upper and lower piles are automatically aligned. .
[0018]
The lower end surface 26 of the cylindrical portion 25 forms a surface perpendicular to the axis of the steel pipe pile. An outer peripheral seat 27 having a surface perpendicular to the axis of the steel pipe pile is provided at the rear end of the male screw 24. In addition, when an appropriate hole or notch 28 is provided on the outer diameter surface of the lower end hardware 20, a tool, a jig, or the like that facilitates turning of the steel pipe pile 100 such as a bar, a spanner, or a tong can be engaged. preferable.
[0019]
The upper end hardware 30 of the steel pipe pile 110 has the same outer diameter as that of the steel pipe pile 110 and is provided with a circumferential groove 32 for welding joint 111 with the steel pipe pile 110 at the lower end. On the upper part of the upper end hardware 30, a female screw 33 is provided to be engaged with the male screw 24 of the lower end hardware 20, and an inner surface seat 34 having a surface perpendicular to the axis is formed on the lower end of the female screw 33. Yes. Further, an inner cylinder 38 is formed above the female screw 33. The inner cylindrical portion 38 has an inner diameter that matches the diameter of the bottom of the female screw 33 and is loosely fitted to the outer diameter of the male screw 24. When the upper steel pipe pile 100 and the lower steel pipe pile 110 are joined, the inner cylindrical portion 38 is loosely fitted to the outer diameter of the male screw 24, and the upper pile is attached so that the axis centers of the upper and lower piles are automatically aligned. To guide.
[0020]
The upper end of the upper end hardware 30 is provided with an axially perpendicular surface 35, and a chamfered portion 36 is provided on the inner periphery thereof. In this embodiment, the distance between the inner surface seat 34 and the upper end surface 35 is slightly smaller than the distance between the lower end surface 26 of the lower end hardware 20 and the outer peripheral seat 27, and the chamfered portion 36 interposes a seal rubber packing. A seal seat is formed to enhance the sealing performance. However, the distance between the inner surface seat 34 and the upper end surface 35 is made larger than the distance between the lower end surface 26 and the outer periphery seat 27 of the lower end hardware 20, and the upper end surface 35 of the upper end hardware 30 and the outer periphery of the lower end hardware 20. The dimensional relationship may be such that the seat 27 is in close contact and a gap is formed between the lower end surface 26 of the lower end hardware 20 and the inner surface seat 34 of the upper end hardware 30.
[0021]
In the embodiment shown in FIG. 1, the cylindrical portion 25 and the inner cylindrical portion 38 are shown as having both, but the centering guide function is sufficient even if only one of them is omitted and the other is omitted. It is. It is easier and more reliable to have both.
The male screw 24 and the female screw 33 are formed as parallel screws having no taper, and are three or more multi-threaded screws. The parallel screw can be joined with a lower torque than the taper screw. Further, in the multi-thread screw, the lead in the axial direction when rotating once is a multiple thread multiple of the thread pitch. Therefore, quick screwing is possible.
[0022]
By providing the cylindrical portion 25 having a screw bottom diameter at the lower end of the upper pile (the lower end portion of the lower end hardware 20), the cylindrical portion 25 serves as a guide to engage the screw at the initial stage when the male screw 24 starts to be screwed into the female screw 33. It can be facilitated and facilitated. The strength and bending rigidity of the joint portion of the pile can be remarkably increased by tightly bringing the lower end surface of the upper pile (the lower end surface 26 of the lower end hardware 20) and the inner peripheral seat 34 of the lower pile into close contact by screwing. .
[0023]
In addition, this joint can prevent groundwater and the like from entering the threaded portion between the male screw 24 and the female screw 33 by sealing with a water-stop rubber ring 37, so that the deterioration of the screw and the binding force of the steel pipe pile can be prevented. There is no risk of a decline.
FIG. 2 is a view taken along the line A-A of FIG. 1, and a female thread 33 of a four-thread thread is provided inside the upper end surface 35 of the upper end hardware 30. FIG. 3 is a plan view of a conventional single thread shown for comparison with FIG. In the four-thread screw of the embodiment of the present invention shown in FIG. 2, there are four screw start end portions 39 (portions surrounded by phantom lines) in the same plane perpendicular to the screw axis. On the other hand, the same applies to the male screw that meshes with the female screw. Therefore, at the beginning of meshing when the male screw meshes with the female screw, the tip of the screw contacts at four points in a plane perpendicular to the screw axis. Accordingly, a stable and smooth start of meshing is always ensured, and no meshing failure occurs at all. The joint joint of the present invention ensures quick and smooth joining in the field by the synergistic effect of the centering guide function by the cylindrical portion 25 and the inner cylindrical portion 38 and the presence of the meshing start end portions in the same plane. ing. In FIG. 3 provided with a conventional single thread, since there is only one screw start end 39, if the axial center of the male screw and female screw is inclined, the meshing becomes unsmooth and stable as in the present invention. The start of meshing cannot be ensured, and there is a risk of cross-threading.
[0024]
4-6 is explanatory drawing which showed typically the joining process of the joint joint of an Example.
FIG. 4 shows a state immediately before the male screw 24 of the lower end hardware 20 and the female screw 33 of the upper end hardware 30 start to engage with each other. The cylindrical portion 25 at the tip of the lower end fitting 20 is fitted to the inner diameter of the female screw 33, the inner cylindrical portion 38 at the upper end of the upper end fitting 30 is fitted to the outer diameter of the male screw 24, and the shaft of the male screw 24 and the female screw 33 are fitted. The axes are automatically aligned approximately coaxial with each other. At the same time, as described with reference to FIG. 2, the meshing start end portion of the male screw 24 and the female screw 33 is in contact with four points in a plane perpendicular to the axis. Screws are engaged.
[0025]
FIG. 5 shows a state in the middle of being screwed smoothly and quickly. FIG. 6 shows a state in which the screwing is completed and the lower end surface 26 of the lower end hardware 20 is in contact with the inner surface seat 34 in the upper end hardware 30.
FIG. 7 is a partial vertical cross-sectional view of the steel pipe piles 100 and 110, showing a state in which the joint of the embodiment using the water blocking rubber ring is completed. The lower end surface 26 of the lower end hardware 20 abuts on the inner surface seat 34 in the upper end hardware 30, and a water stop rubber ring is provided between the outer peripheral seat 27 of the lower end hardware 20 and the chamfer 36 of the upper end surface 35 of the upper end hardware 30. The example which attached 87 is shown.
[0026]
FIG. 8 schematically shows a bending test of a joint portion of a steel pipe according to the present invention.
In the steel pipe pile joint of the present invention, the bending moment of the joint portion is transmitted by the thread portion, and the material strength of the joint hardware such as the lower end hardware 20 and the upper end hardware 30 is 50 to 50%. In the case of 60 kgf / mm ² , 80 kgf / mm ² grade steel is used and welded to the steel pipe pile. The strength of the joint is such that the cross-section edge yield moment at the critical section is greater than or equal to the cross-section edge yield moment of the steel pipe pile, the total plastic moment at the critical section is greater than or equal to the total plastic moment of the steel pipe pile, and the thread edge shear yield The moment shall be greater than the total plastic moment of the steel pipe pile. In addition, the cross-sectional rigidity of a joint part shall be more than the cross-sectional rigidity of the raw pipe of a steel pipe pile.
[0027]
As shown in FIG. 8, the steel pipe piles (base pipes) 100 and 110 are supported by the support part 121 with the joint part 120 in the center, and are loaded via loading beams 123 at two positions 122 and 122 sandwiching the joint part 120. The bending characteristic of the joint part 120 was tested by applying a load 124. As a test material, a steel pipe pile made of SKK490 material having an outer diameter of 300 mm and a wall thickness of 19.5 mm was used, and the relationship between the bending moment and the displacement is shown in FIG. In this test, the clearance between the lower end surface of the lower end hardware and the inner peripheral seat of the upper end hardware is set to 5 mm in consideration of the joint joint allowable value on site construction. The solid line in FIG. 9 is the test value, and the broken line is the calculated value. The edge yield bending moment My, the total plastic moment Mp, and the cross-sectional rigidity of the joint part exceed the characteristics of the bare pipe, and show excellent characteristics.
[0028]
FIG. 10 shows another embodiment of the joint of the present invention. The lower end hardware 40 attached to the lower end of the steel pipe pile 100 and the upper end hardware 50 attached to the upper end of the steel pipe pile 110 are combined. The lower end metal part 40 is welded and joined 101 to the steel pipe pile 100, and a cylindrical part 45 having a screw bottom diameter as an outer diameter is formed at the tip of the male screw 42. The lower end surface 46 forms a surface perpendicular to the axis of the steel pipe pile. A seal seat 47 is provided at the rear end of the male screw 42.
[0029]
The upper end hardware 50 of the steel pipe pile 110 is welded and joined to the steel pipe pile 110, and a female screw 53 is provided on the inner diameter. An inner cylindrical surface 55 is formed below the female screw 53, and the cylindrical portion 45 below the male screw enters.
The male screw 42 and the female screw 53 are formed as parallel screws having no taper, and are three or more multi-threaded screws. The parallel screw can be joined with a lower torque than the taper screw. Further, in the multi-thread screw, the lead in the axial direction when rotating once is a multiple thread multiple of the thread pitch. Therefore, quick screwing is possible.
[0030]
When the male screw 42 is screwed into the female screw 53, the cylindrical portion 45 serves as a guide along the inner diameter of the female screw 53 before screwing, so that the upper and lower piles can be easily centered. By screwing, the lower end face 46 of the lower end fitting 40 and the inner peripheral seat 56 of the upper end fitting 50 are brought into close contact with each other, whereby the strength and bending rigidity of the joint joint portion of the steel pipe pile can be remarkably increased.
[0031]
A concave hole 48 is provided in the outer peripheral surface of the cylindrical portion 45 of the lower end hardware 40, and a set bolt mounting hole 58 is provided in the cylindrical wall 54 of the upper end hardware 50. As shown in FIG. 11, the set bolt mounting hole 58 is made to face the concave hole 48, and the set bolt 60 is screwed into the set bolt mounting hole 58 to form a detent between the lower pile and the upper pile, and the upper pile is reversed. Even so, the male screw 42 is prevented from coming out. A cross-sectional view taken along the line BB in FIG. 11 is shown in FIG. This example shows a case where the screw is a four-thread screw. A pair of mounting holes 58 for the set bolts are provided on the cylindrical wall 54 of the upper end hardware 50 symmetrically about the center point. In the lower end hardware 40, four pairs, that is, eight concave holes 48 are arranged at equal intervals on the circumference. In this manner, when the lower end hardware is reversed within 45 degrees (within 1/8 of the circumference) by the central angle, any of the recessed holes 48 and the set bolt mounting holes 58 face each other. In general, in the case of N threads, the concave holes 48 may be arranged in an even number of N pairs or more on the circumference. In this way, the set bolt can be set by reversing the axial movement less than one-half of the screw pitch, and the accuracy of the relationship between the diameter of the recessed hole, the position of the set bolt and the diameter of the set bolt, and the position of the set Can be well defined. Further, since the screw pitch is usually about 8 mm, it can be achieved by returning the screw within 4 mm in the axial direction. Thereby, it becomes less than the tolerance (5 mm) of the clearance gap of the joint joint part in the construction, and sufficient joint strength can be ensured.
[0032]
In addition, in this Example, although the concave hole 48 is made into a circular hole and the example which is not a through-hole is shown, according to the use conditions etc. of a steel pipe pile, a through-hole, a circumferential concave groove, a shaft are used instead of a concave hole. The use of directional grooves or any other deformation is not limited. Further, the position, number, size and the like of the set bolt mounting hole 58 are not limited to the above embodiment, and a spare hole or the like may be provided. FIG. 13 is a perspective view showing screwing of the set bolt.
[0033]
14 and 15 are explanatory diagrams of the alignment of the upper and lower piles. If the axial centers of the upper end hardware 50 of the lower pile and the lower end hardware 40 of the upper pile do not coincide with each other, a large gap 70 is generated at the joint end in a large-diameter pile even if a slight axial misalignment occurs. For example, when the vertical accuracy of the lower pile is 1/200, in a pile having a diameter of 600 mm, the gap 70 on the joint joint surface is 3 mm. The screws cannot be joined unless the four points 71, 72, 73, and 74 shown in FIG. In the present invention, this center is formed by a synergistic effect with one or both of the cylindrical portion at the tip of the male screw at the lower end hardware and the inner cylindrical portion at the tip of the female screw at the upper end hardware, and the multi-thread structure of the present invention. The dispensing is extremely easy and reliable. In addition, the multi-threaded screw has a very large lead and can be joined quickly. Therefore, the steel pipe pile joint of the present invention is labor-saving, time-saving, safe, reliable, highly reliable, and optimal for rapid construction.
[0034]
Further, as shown in FIG. 16, the cylindrical portion at the lower end of the lower end hardware is characterized in that when the pile 100 is lifted upward 131 by the lifting tool 130, the screw does not contact the floor surface 132 and the screw portion is protected. is there.
[0035]
【The invention's effect】
Since the bonded joint of the steel pipe pile of the present invention is configured as described above, the following excellent effects are exhibited. That is, there is an automatic alignment action of the steel pipe pile, and the construction time for the on-site connection of the steel pipe pile can be shortened. Moreover, it can be constructed quickly and accurately without being affected by the construction accuracy of the lower pile. Engagement of the screws can be made extremely smooth, labor-saving and reliable construction is possible, and joint quality can be improved.
[0036]
In another embodiment of the present invention, the piles are not damaged when the pile is lifted, the upper and lower piles are easily centered and screwed in easily, and the construction such as joining is easy and accurate. In addition to hammering, the joints will not come out even when the piles are reversed.
[Brief description of the drawings]
FIG. 1 is a side view and a longitudinal sectional view of a joint joint according to an embodiment.
FIG. 2 is a plan view of a screw start end portion of a joint joint according to an embodiment.
FIG. 3 is a plan view of a screw start end portion of a conventional joint.
FIG. 4 is an explanatory diagram of a joining process of a joint joint according to an embodiment.
FIG. 5 is an explanatory diagram of a joining process of a joint joint according to an embodiment.
FIG. 6 is an explanatory diagram of a joining process of a joint joint according to an embodiment.
FIG. 7 is a partial longitudinal sectional view showing a joined state of the joint of the example.
FIG. 8 is an explanatory diagram of a bending test of a joint of an example.
FIG. 9 is a graph showing the bending performance of the joint of the example.
FIG. 10 is a longitudinal sectional view of a joint metal fitting according to another embodiment.
FIG. 11 is a longitudinal sectional view of the joint hardware of the embodiment of FIG.
12 is an AA arrow view of the embodiment of FIG.
13 is a perspective view of the embodiment of FIG.
FIG. 14 is an explanatory view of the centering of the joint hardware.
FIG. 15 is an explanatory view of the centering of the joint hardware.
FIG. 16 is an explanatory diagram of lifting a pile.
[Explanation of symbols]
20 Lower end hardware 21 Upper cylinder 22 Groove 23 Lower cylinder 24 Male screw 25 Cylindrical part 26 Lower end surface 27 Outer peripheral seat 28 Hole or notch 30 Upper end hardware 31 Outer peripheral part 32 Female groove 34 Inner face seat 35 Upper end face 36 Chamfer 37 Stop Water rubber ring 38 Internal cylindrical portion 39 Screw start end 40 Lower end hardware 42 Male screw 45 Cylindrical portion 46 Lower end 47 Upper end surface 48 Recessed hole or groove 50 Upper end hardware 53 Internal thread 54 Cylindrical wall 55 Inner surface (cylindrical surface)
56 Inner seat 58 Set bolt mounting hole 60 Set bolt 70 Clearance 71, 72, 73, 74 Point 100, 110 Steel pipe pile 101, 111 Weld joint 120 Joint part 121 Support part 122 Load point 123 Beam 124 Load 130 Lifting tool 131 Lifting 132 Floor

Claims (7)

Each of the steel pipe pile ends is provided with a male cylinder having a male thread and a female cylinder having a female thread. The screw is a multi-threaded thread having three or more parallel threads, and the female thread is formed at the tip of the male cylinder. A steel pipe pile joint, comprising a cylindrical portion having an outer diameter loosely fitted to the inner diameter. The steel pipe pile joint according to claim 1, wherein an inner cylindrical portion that loosely fits to the outer diameter of the male screw is provided at the tip of the female cylinder instead of the cylindrical portion. The steel pipe pile joint according to claim 1, wherein an inner cylindrical portion that loosely fits to the outer diameter of the male screw is provided at the tip of the female cylinder. The steel pipe pile joint according to claim 1 or 3, wherein an inner circumferential seat with which the tip of the cylindrical portion abuts is provided on the inner surface of the female side cylindrical body. The steel pipe pile joint according to claim 2, 3 or 4, wherein an outer peripheral seat with which the tip of the inner cylindrical portion abuts directly or via a water-stopping rubber ring is provided on the outer surface of the male cylinder. A concave groove or a concave hole is provided on the outer periphery of the cylindrical portion, and a mounting bolt mounting hole that fits into the concave groove or the concave hole is provided in the female cylinder. 5. A joint for steel pipe piles according to 5. A pair of mounting holes for the set bolts are provided symmetrically with respect to the center of the cylinder, and the concave holes are symmetrical with respect to the central point of the cylinder, where N (N is the number of multiple threads) equal to or greater than the circumference on the circumference. bonding joint hands of the steel pipe pile according to claim 6, characterized in that the placed.

Images