JP5370311B2 - Steel pipe sheet pile, steel pipe sheet pile joint structure, steel pipe sheet pile foundation, and method of manufacturing steel pipe sheet pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe sheet pile, a joint structure of the steel pipe sheet pile, a steel pipe sheet pile foundation, and a manufacturing method of the steel pipe sheet pile, capable of reducing manufacturing costs, improving workability, and improving the shear capacity of a joint part. <P>SOLUTION: In the steel pipe sheet pile 2 having a joint steel pipe 5 fixed to the outer surface of a steel pipe sheet pile main pipe 4, the joint steel pipe 5 has recessed parts 51 recessed from the outer surface of the joint steel pipe 5 to the inside at prescribed intervals in the axial direction of the joint steel pipe 5, the recessed parts 51 can be formed by cold working such as roll working after the steel pipe is manufactured, and the manufacturing cost of the steel pipe sheet pile 2 is reduced. Further, since the recessed part 51 of one joint steel pipe 5 and the other joint steel pipe 5 can be brought into point contact and the competition of the joint steel pipes 5 with each other is suppressed, placing resistance is reduced and the workability is improved. Also, since a filler 6 is stuck to the recessed parts 51 as well, the shear capacity of the joint part 3 is improved. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a steel pipe sheet pile, a joint structure of steel pipe sheet piles, a steel pipe sheet pile foundation, and a method for manufacturing a steel pipe sheet pile.

  Conventionally, as a joint structure of steel pipe sheet piles, a circular joint steel pipe having a slit is fixed to each of adjacent steel pipe sheet piles, and steel pipe sheet piles are continuously built in the ground while fitting these joint steel pipes, A joint structure is generally used in which mortar is filled in a joint steel pipe and the steel pipe sheet piles are connected to each other after excavating and cleaning the earth and sand in the joint steel pipe. Such a joint structure is called a P (pipe) -P (pipe) joint (PP joint) because joint steel pipes (P: pipes) are fitted to each other.

The conventional joint structure as described above has the following disadvantages.
In the case of PP joints, since three spaces are formed in the fitting joint portion in which the joints are fitted together, soil excavation, cleaning, and mortar are performed in each space of the narrow joint portion after fitting. It is necessary to perform each operation such as filling. For this reason, it is difficult to perform reliable cleaning and solid mortar filling of the joint part, and the quality may become unstable. There is a possibility that the shear strength cannot be exhibited reliably.

  Therefore, as a joint structure of a steel pipe sheet pile that eliminates such inconvenience of the joint structure and secures the shear strength of the joint part, one joint steel pipe having a protrusion part on the outer peripheral surface, and a protrusion part on the inner peripheral face A joint structure has been proposed in which the other joint steel pipe is fitted to each other (see Patent Document 1). In such a steel pipe sheet pile described in Patent Document 1, one of the three spaces surrounded by each joint steel pipe by fitting the joint steel pipes together is a joint steel pipe having a protrusion on the outer peripheral surface; It is enclosed with the joint steel pipe which has a projection part in an internal peripheral surface. And if this space is filled with fillers, such as mortar, mortar will adhere to the outer peripheral surface and inner peripheral surface of a joint steel pipe which has a projection part, and the adhesion strength of mortar and a joint steel pipe can be raised. This improves the shear strength of the joint even when a horizontal external force acts on the steel pipe sheet pile foundation formed by fitting the joint steel pipes to each other due to an earthquake, earth pressure, water pressure, etc. Can be done.

  There has also been proposed a joint structure in which a plurality of rows of anti-slip members are welded in succession in the axial direction to the outer peripheral surface of a joint steel pipe, and the joint steel pipe is fitted to each other (see Patent Document 2). In such a steel pipe sheet pile described in Patent Document 2, when the joint steel pipes are fitted to each other, the slip prevention member of one joint steel pipe is formed of a bar steel such as a round steel or a perforated steel sheet, and one joint steel pipe Is welded so as to face the inner peripheral surface of the joint steel pipe of the other steel pipe sheet pile. For this reason, when fitting steel pipes together, the space surrounded by one joint steel pipe welded to the outer peripheral surface and the other joint steel pipe, and the other welded to the outer peripheral face A space surrounded by the joint steel pipe and one joint steel pipe is formed. When such a space is filled with mortar, the mortar mechanically engages with a plurality of anti-slipping members in addition to the outer peripheral surface and inner peripheral surface of each joint steel pipe, thereby increasing the adhesion strength between the mortar and the joint steel pipe. be able to. Therefore, also in the steel pipe sheet pile described in Patent Document 2, the shear strength of the joint portion can be improved.

JP 2006-161375 A JP 2008-95490 A

However, in the steel pipe sheet piles described in Patent Documents 1 and 2, when the steel pipe sheet pile is driven while fitting the joint steel pipes, the opening edge of the slit of one joint steel pipe is connected to the outer peripheral surface of the other joint steel pipe. Because of the contact, the joint steel pipes compete with each other, the driving resistance increases, and the workability decreases.
Moreover, in the steel pipe sheet pile described in Patent Document 1, in order to form a protrusion on the outer peripheral surface or inner peripheral surface of the joint steel pipe, the protrusion-formed steel plate is rolled and deformed by hot rolling using a rolling roll. The pipe must be formed so that the part is on the outside or the inside. Moreover, in the steel pipe sheet pile described in patent document 2, it is necessary to weld a slip prevention member to a joint steel pipe in the process of manufacturing a steel pipe. Thus, in the steel pipe sheet piles described in Patent Documents 1 and 2, there are disadvantages that the labor of processing increases and the manufacturing cost increases.

  An object of the present invention is to provide a steel pipe sheet pile, a joint structure of a steel pipe sheet pile, a steel pipe sheet pile foundation, and a method of manufacturing a steel pipe sheet pile that can reduce manufacturing costs and improve workability and improve the shear strength of the joint portion. Is to provide.

The steel pipe sheet pile of the present invention is a steel pipe sheet pile including a steel pipe sheet pile main pipe and a joint steel pipe fixed to the outer surface of the steel pipe sheet pile main pipe, and the joint steel pipe has a predetermined interval in the axial direction of the joint steel pipe. And, a hollow portion recessed from the outer surface of the joint steel pipe toward the inside, and a slit extending in the axial direction of the joint steel pipe are formed , the hollow portion is formed intermittently in the circumferential direction of the joint steel pipe, The slit is formed in a flat portion that is continuous in the axial direction between the hollow portions, among the unprocessed portions that are portions where the hollow portions are not formed, and the flat portion is in the circumferential direction of the joint steel pipe, It has a predetermined dimension from the opening edge of the slit to the recess .

According to the present invention, the joint steel pipe is recessed from the outer surface toward the inside, so that a recessed portion is formed. Therefore, in the process of manufacturing the steel pipe as described above, The step of welding the slip prevention member can be omitted, and after manufacturing the steel pipe, the recess can be formed by cold working such as press working. Therefore, it is possible to reduce the processing time of the joint steel pipe, to suppress the manufacturing cost, and to reduce the manufacturing cost of the steel pipe sheet pile.
Furthermore, since the hollow portions are formed at predetermined intervals in the axial direction of the joint steel pipe, when placing the steel pipe sheet pile while fitting the joint steel pipes together, the hollow portion of one joint steel pipe and the outer surface of the other joint steel pipe Can be brought into point contact, and the opening edge of the slit of one joint steel pipe and the inner surface of the other joint steel pipe can be point contacted, reducing frictional resistance compared to line contact or surface contact. Can be made. Thereby, when placing a steel pipe sheet pile, since a bid between joint steel pipes can be suppressed, the placing resistance can be reduced and the workability can be improved.
When the joint steel pipes are fitted to each other, three spaces surrounded by the joint steel pipes are formed, and when the three spaces are filled with the filler, the filler fills the recessed portion and the outer surface of the joint steel pipe. Since it adheres also to the part in which a hollow part is formed, the shift | offset | difference with the outer surface or inner surface of each joint steel pipe and a filler can be suppressed, and the shear strength of a joint part can be improved. In addition, since the filler in the space can also be constrained in the vertical direction (longitudinal direction), it is possible to suppress misalignment between the joint steel pipes (construction error in the direction in which the joint steel pipes are separated from each other or in the direction in which they are close to each other). The space can be reliably filled, and the shear strength of the joint can be further improved.

Further, in the steel pipe sheet piles of the present invention has a predetermined size to recess from an opening edge of the slits, since the flat portion continuous in the axial direction is formed, the steel pipe sheet pile while fitting the fitting steel pipes , The joint steel pipes are fitted to each other without the dent part of one joint steel pipe interfering with the dent part of the other joint steel pipe. Therefore, it is possible to prevent the joint steel pipes from fitting together while the hollow part of one joint steel pipe interferes with the hollow part of the other joint steel pipe, and it is possible to smoothly fit the joint steel pipes, thereby improving workability. Can do.

In the steel pipe sheet pile joint structure of the present invention, among the steel pipe sheet piles placed adjacent to each other, the steel pipe sheet piles are connected to each other by fitting the one joint steel pipe and the other joint steel pipe. It is characterized by.
According to such a configuration, as described above, after manufacturing the steel pipe, the recessed portion can be formed, for example, by cold working such as press working, reducing the labor for processing the joint steel pipe, and the manufacturing cost. And the manufacturing cost of the steel pipe sheet pile can be reduced. Furthermore, since the recesses are formed at predetermined intervals in the axial direction of the joint steel pipe, when placing the steel pipe sheet pile while fitting the joint steel pipes, it is possible to suppress the competition between the joint steel pipes. It can be reduced and the workability can be improved. In addition, when the filler is filled in the three spaces formed when the joint steel pipes are fitted to each other, the filler adheres to the recessed portion and the portion where the recessed portion is formed on the outer surface of the joint steel pipe. And the shift | offset | difference with the outer surface or inner surface of each joint steel pipe, and a filler can be suppressed, and the shear strength of a joint part can be improved. In addition, since the filler in the space can also be constrained in the vertical direction (longitudinal direction), it is possible to suppress misalignment between the joint steel pipes, reliably fill the filler with the space, and further improve the shear strength of the joint. be able to.

The steel pipe sheet pile foundation of the present invention is characterized in that adjacent steel pipe sheet piles are connected to each other by the joint structure of any of the above steel pipe sheet piles.
According to such a configuration, as described above, it is possible to reduce the processing labor of the joint steel pipe, to suppress the manufacturing cost, to reduce the manufacturing cost of the steel pipe sheet pile, and to suppress the competition between the joint steel pipes. Therefore, the placing resistance can be reduced and the workability can be improved. Furthermore, since the filler filled in the joint steel pipe also adheres to the recesses, the displacement between each joint steel pipe and the filler can be suppressed, and the filler can be constrained in the joint steel pipe. Can be further improved.

The method for manufacturing a steel pipe sheet pile according to the present invention is a manufacturing method for manufacturing a steel pipe sheet pile including a steel pipe sheet pile main pipe and a joint steel pipe fixed to the outer surface of the steel pipe sheet pile main pipe, and is in the axial direction of the joint steel pipe. A recessed portion is formed by roll processing or pressing so as to be recessed from the outer surface of the joint steel pipe toward the inside at a predetermined interval, and in the axial direction with respect to an unprocessed portion other than the recess portion in the joint steel pipe After the slit is formed, the joint steel pipe is welded to the outer surface of the joint steel pipe main pipe.
According to such a configuration, as described above, after manufacturing the steel pipe, the hollow portion can be formed by roll processing or cold processing by press processing. Therefore, a hollow part can be formed by an easy process, the process labor of a joint steel pipe can be reduced, a manufacturing cost can be suppressed, and the manufacturing cost of a steel pipe sheet pile can be reduced.

  According to the steel pipe sheet pile of the present invention as described above, the steel pipe sheet pile joint structure, the steel pipe sheet pile foundation, and the steel pipe sheet pile manufacturing method, it is possible to reduce the manufacturing labor of the joint steel pipe, suppress the manufacturing cost, and manufacture the steel pipe sheet pile. Cost can be reduced. Furthermore, since the competition between the joint steel pipes can be suppressed, the casting resistance can be reduced and the workability can be improved. In addition, since the filler adheres to the recess and the portion of the outer surface of the joint steel pipe where the recess is formed, the displacement between the outer surface or the inner surface of each joint steel pipe and the filler can be suppressed, and the shear strength of the joint Can be improved. Furthermore, since the filler in the space can be constrained, the displacement between the joint steel pipes can be suppressed, the filler can be reliably filled into the space, and the shear strength of the joint can be further improved.

It is the top view and sectional drawing which show the steel pipe sheet pile foundation which concerns on embodiment of this invention. It is sectional drawing which expands and shows the joint structure of the steel pipe sheet pile in the said steel pipe sheet pile foundation. It is a perspective view which expands and shows the fixed part of the joint steel pipe of the said steel pipe sheet pile. It is the cross-sectional view and longitudinal cross-sectional view which expand and show the said joint steel pipe. It is sectional drawing of the position shown by the arrow V-V line in FIG. It is sectional drawing which shows the effect | action of the said joint structure. It is sectional drawing which shows the effect | action of the said joint structure. It is the cross-sectional view and longitudinal cross-sectional view which expand and show the joint steel pipe which concerns on the modification of this invention.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a steel pipe sheet pile foundation 1 according to the present embodiment is a well foundation supporting a bridge pier provided near a river or a coast, and a plurality of steel pipe sheet piles 2 penetrating into the ground G on the riverbed or the seabed. These steel pipe sheet piles 2 are connected to each other via a joint portion 3 while being arranged side by side in a plane circle.
As shown in FIG. 2, each steel pipe sheet pile 2 includes a steel pipe sheet pile main pipe 4 (hereinafter simply referred to as a main pipe 4) made of a circular steel pipe (for example, a steel pipe having a diameter of 1200 mm and an axial length of 30 m), A joint steel pipe 5 made of a pair of circular steel pipes provided on the side surface of the main pipe 4 (in FIG. 2, only one joint steel pipe 5 of the pair of joint steel pipes 5 in the steel pipe sheet pile 2 is shown). Yes.

  Of the pair of steel pipe sheet piles 2 placed adjacent to each other, the joint part 3 is fitted with a joint steel pipe 5A of one steel pipe sheet pile 2A and a joint steel pipe 5B of the other steel pipe sheet pile 2B. The steel pipe sheet piles 2A and 2B can be connected to each other by filling the spaces A, B and C composed of the joint steel pipes 5A and 5B with cement-based room temperature curable filler 6 (hereinafter simply referred to as filler 6) such as mortar. It is comprised so that it may connect.

  In such a joint part 3, by fitting the joint steel pipes 5A and 5B as shown in FIG. 2, the filler 6 is filled in the positions surrounded by the inner surfaces of the joint steel pipes 5A and 5B. A space A is formed. Further, a filling space B in which the filler 6 is continuously filled in the filling space A is formed at a position surrounded by the inner surface of the joint steel pipe 5A and the outer surface of the joint steel pipe 5B, and the outer surface of the joint steel pipe 5A and the joint In a position surrounded by the inner surface of the steel pipe 5B, a filling space C in which the filling material 6 is continuously filled in the filling space A is formed.

As shown in FIG. 3, the joint steel pipe 5 is welded to the outer surface of the main pipe 4 in the steel pipe sheet pile 2 along the axial direction of the main pipe 4. Then, as shown in FIG. 3 or FIG. 4, the joint steel pipe 5 is intermittently recessed in the circumferential direction from the outer surface of the joint steel pipe 5 toward the inside at predetermined intervals in the axial direction of the joint steel pipe 5. And a slit 52 extending in the axial direction of the joint steel pipe 5. The hollow part 51 is formed along the horizontal direction in a state where the steel pipe sheet pile 2 is driven. The slit 52 is formed in the flat part 54 which continues in the axial direction between the hollow parts 51 among the non-processed parts 53 which are the part in which the hollow part 51 is not formed. That is, in the circumferential direction of the joint steel pipe 5, the flat portion 54 having a predetermined dimension is formed from the opening edge of the slit 52 to the recessed portion 51, and thus the recessed portion 51 is formed up to the opening edge of the slit 52. It has not been.
Here, the recess 51 is formed by cold working such as roll processing or press working so as to sandwich the outer surface of the joint steel pipe 5.

  When the steel pipe sheet pile 2 is driven while fitting the joint steel pipes 5A and 5B in the joint part 3 described above, the slit 52 of one joint steel pipe 5A is inserted through the slit 52 of the other joint steel pipe 5B. By the way, when the hollow part is formed up to the opening edge of the slit, the hollow part of one joint steel pipe may interfere with the hollow part of the other joint steel pipe, and the joint steel pipes may not be fitted smoothly. is there. Therefore, as described above, the recess 51 is not formed up to the opening edge of the slit 52, and the flat portion 54 is continuous in the axial direction of the joint steel pipe 5 between the recess 51 and the opening edge of the slit 52. Therefore, when one slit 52 is inserted into the other slit 52, the recess 51 of one joint steel pipe 5A does not interfere with the recess 51 of the other joint steel pipe 5B. Since the steel pipes 5 can be smoothly fitted to each other, the workability can be improved.

  Moreover, in the joint part 3, when fitting steel pipe 5A, 5B is fitted as shown in FIG. 2, each hollow part 51 of joint steel pipe 5A, 5B is shown by FIG. As shown in the cross-sectional view shown in FIG. For this reason, for example, when the steel pipe sheet piles 2A and 2B shown in FIG. 6 are pressed and driven in the directions approaching each other, the hollow portion 51 of one joint steel pipe 5A is the other joint. The outer surface of the steel pipe 5B (the outer surface on which the hollow part 51 of the joint steel pipe 5B is not formed) is in contact, and the hollow part 51 of the other joint steel pipe 5B is the outer surface of the one joint steel pipe 5A (the hollow part 51 of the joint steel pipe 5A is The outer surface is not formed. That is, the recess 51 is in point contact with the outer surface of the joint steel pipe 5 at a predetermined interval in which the recess 51 is formed in the axial direction of the joint steel pipe 5. Therefore, even when it becomes such a compression fitting state, when the steel pipe sheet pile 2 is driven, when the hollow part 51 is not formed in the joint steel pipe 5 (the opening edge of the slit 52 is the joint steel pipe 5). Compared to the case of line contact with the outer surface or the case of surface contact), the competition between the joint steel pipes 5 can be suppressed, so that the casting resistance can be reduced. Furthermore, since the hollow part 51 contacts the outer surface of the joint steel pipe 5, compared with the case where the opening edge of the slit 52 is in line contact or surface contact with the outer surface of the joint steel pipe 5 as described above, the joint steel pipe 5A. , 5B can be ensured, and even in the compression fitting state, it is possible to secure a large space for the filling spaces B and C. Thus, the filler 6 can be added to the filling space A and the filling spaces B and C can be reliably filled, and the shear strength of the joint portion 3 can be improved.

  Moreover, in the joint part 3, for example, even when the steel pipe sheet piles 2A and 2B shown in FIG. Since the part 51 is formed at a position shifted from each other in the axial direction, the opening edge of the slit 52 of one joint steel pipe 5A contacts the recess 51 of the other joint steel pipe 5B, and the other joint steel pipe 5B. The opening edge of the slit 52 is in contact with the recess 51 of one joint steel pipe 5A. That is, even in such a tension fitting state, the opening edge of the slit 52 is in contact with the recess 51, and therefore, when the recess 51 is not formed in the joint steel pipe 5 (open end of the slit 52 Compared to the case where the edge makes line contact with the inner surface of the joint steel pipe 5 or the case where the edge contacts the inner surface of the joint steel pipe 5, the competition between the joint steel pipes 5 can be suppressed, so that the casting resistance can be reduced. Further, as described above, compared with the case where the opening edge of the slit 52 is in line contact with the inner surface of the joint steel pipe 5 or the surface contact, the interval between the joint steel pipes 5A and 5B can be secured, and the tension fitting state is obtained. Even in this case, a large space for the filling space A can be secured. Thereby, in addition to the filling spaces B and C, the filler 6 can be reliably filled into the filling space A, and the shear strength of the joint portion 3 can be improved.

According to the present embodiment described above, the joint steel pipe 5 is recessed from the outer surface toward the inside, so that the hollow portion 51 is formed. Therefore, after the steel pipe is manufactured, cold working such as roll processing or press working is performed. Thus, the recess 51 can be formed. Therefore, it is possible to reduce the processing labor of the joint steel pipe 5, suppress the manufacturing cost, and reduce the manufacturing cost of the steel pipe sheet pile 2.
Furthermore, since the hollow part 51 is formed in the axial direction of the joint steel pipe 5 at predetermined intervals, when placing the steel pipe sheet pile 2 while fitting the joint steel pipes 5 together, it is possible to suppress the competition between the joint steel pipes 5. The placement resistance can be reduced and the workability can be improved.
When the joint steel pipes 5 are fitted to each other, three filling spaces A to C surrounded by the respective joint steel pipes are formed. When the three filling spaces A to C are filled with the filler 6, the filler 6 Is attached to the recessed portion 51 and the portion of the outer surface of the joint steel pipe 5 where the recessed portion 51 is formed, so that the displacement between the outer surface or the inner surface of each joint steel pipe 5 and the filler 6 can be suppressed. Shear strength can be improved. Moreover, since the filler 6 in the filling spaces A to C can also be constrained in the vertical direction (longitudinal direction), the displacement between the joint steel pipes 5 (the construction error in the direction in which the joint steel pipes are separated from each other or in the direction in which they are close to each other) is suppressed. The filling material 6 can be reliably filled into the filling spaces A to C, and the shear strength of the joint portion 3 can be further improved.

In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, in the said embodiment, although the steel pipe sheet pile foundation 1 used as a foundation of a bridge pier was demonstrated, the steel pipe sheet pile foundation in this invention can be utilized as a foundation which supports not only a bridge pier but arbitrary structures. is there. Moreover, the steel pipe sheet pile of the present invention and the joint structure of the steel pipe sheet pile are not limited to the steel pipe sheet pile foundation, but can be used as an arbitrary structure such as a retaining wall, a revetment structure, a connecting wall for underground structures, and its use is particularly It is not limited.

  In the said embodiment, although the hollow part 51 was formed along the horizontal direction in the state by which the steel pipe sheet pile 2 was driven, as shown in FIG. It may be formed so as to be recessed from the outer surface toward the inside.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  DESCRIPTION OF SYMBOLS 1 ... Steel pipe sheet pile foundation, 2 ... Steel pipe sheet pile, 3 ... Joint part, 4 ... Steel pipe sheet pile main pipe, 5 ... Joint steel pipe, 6 ... Filler, 51 ... Recessed part, 52 ... Slit, 53 ... Unprocessed part, 54 ... Flat part.

Claims (4)

A steel pipe sheet pile comprising a steel pipe sheet pile main pipe and a joint steel pipe fixed to the outer surface of the steel pipe sheet pile main pipe,
Wherein the joint steel pipe, a predetermined distance in the axial direction of those該継hand steel pipe and a recessed recess portion toward the inside from the outer surface of the joint steel pipe, and a slit extending in the axial direction of those該継hand steel pipe is formed,
The recess is formed intermittently in the circumferential direction of the joint steel pipe,
The slit is formed in a flat portion that is continuous in the axial direction between the hollow portions, among the unprocessed portions that are portions where the hollow portions are not formed,
The said flat part has a predetermined dimension from the opening edge of the said slit to the said hollow part in the circumferential direction of the said joint steel pipe, The steel pipe sheet pile characterized by the above-mentioned . The steel pipe sheet pile according to claim 1, wherein the steel pipe sheet piles are connected to each other by fitting one of the joint steel pipes and the other of the joint steel pipes. Construction. A steel pipe sheet pile foundation in which adjacent steel pipe sheet piles are connected by the joint structure of steel pipe sheet piles according to claim 2 . A manufacturing method of manufacturing a steel pipe sheet pile comprising a steel pipe sheet pile main pipe and a joint steel pipe fixed to the outer surface of the steel pipe sheet pile main pipe,
In a predetermined interval in the axial direction of the joint steel pipe, a recess is formed by roll processing or press processing so as to be recessed from the outer surface of the joint steel pipe,
A method of manufacturing a steel pipe sheet pile, comprising forming a slit in the axial direction with respect to an unprocessed part other than the hollow part in the joint steel pipe, and then welding the joint steel pipe to an outer surface of the joint steel pipe main pipe. .

Images