JP4424236B2 - Steel pipe sheet pile joint structure and steel pipe sheet pile construction method - Google Patents

Description

  The present invention relates to a steel pipe sheet pile joint structure and a steel pipe sheet pile construction method applied to a foundation structure such as a bridge foundation planned on a large depth of water, such as a riverbank or a shoreline, or soft ground, for example. is there.

  Generally, in the construction of a steel pipe sheet pile, a plurality of steel pipe sheet piles are connected before reaching a depth that requires placement. Conventionally, such steel pipe sheet piles have been joined by welding at the construction site, but the quality is not stable, special technology is required, the work time is long, and it depends on the weather. There was a problem that problems were likely to occur in the process.

  Therefore, in order to solve these problems, it is possible to adopt mechanical joints such as plug-in type and screw-in type that have been proposed as part of steel pipe pile joints and are used as joint means for steel pipe sheet piles instead of welding. It is considered.

  As a joint structure of a steel pipe pile that does not depend on welding, an engagement member that extends to the end portion of the first pile, and an engaged member that extends to the end portion of the second pile, At least one of the engaged members has elasticity, and the engaging member and the engaged member are in contact with each other and relatively deformed so that the first pile and the second pile are joined. (For example, refer to Patent Document 1).

  In addition, a plurality of engagement grooves each including an axial groove portion formed in the axial direction from an end surface thereof on the inner periphery of the fitting female portion and a circumferential groove portion formed in the circumferential direction connected to the lower portion thereof are provided in the circumferential direction. A plurality of engaging projections that are fitted into the axial groove portion of the engaging groove in accordance with the fitting with the fitting female portion are spaced apart in the circumferential direction on the outer periphery of the fitting male portion. And the rotation preventing member is temporarily fixed so as to be aligned with the protrusions in the axial direction above the engagement protrusions, and the fitting male part fitted to the fitting female part is rotated. The engagement protrusion is fitted into the circumferential groove portion of the engagement groove, the temporary stop of the rotation prevention member is released, and the rotation prevention member falls in the axial groove portion, and the inlet portion of the circumferential groove portion There is a joint structure of a steel pipe pile that is closed (see, for example, Patent Document 2).

JP 2003-3463 A JP 2003-90034 A

  In order to connect a steel pipe sheet pile to an adjacent steel pipe sheet pile, it is generally opposed to the axial direction of the outer wall surface of the steel pipe main body, and is provided with a transverse coupling joint (see FIG. 4) having a C-shaped cross section over almost the entire length. When the upper and lower steel pipe sheet piles are joined by the mechanical steel pipe joint member as described above, it is necessary to provide a distant piece on the outer wall surface of the steel pipe joint member corresponding to the lateral coupling joint provided on the steel pipe body. is there.

By the way, since the insertion type or screw-in type joint members as in Patent Documents 1 and 2 generally use high-tensile steel (strength of 600 N / mm ² or more) in order to ensure the strength higher than that of the steel pipe body, When joining the distant piece to the outer wall surface of the joint member by welding, special considerations such as preheating and afterheating must be taken into account.
However, at the construction site, preheating and post-heating treatments are complicated, and it is extremely difficult not only to take time to weld the distant piece to the steel pipe joint member, but also to control temperature. It was.

  The present invention has been made to solve the above-described problems. A steel pipe sheet pile joint structure and a steel pipe sheet pile capable of easily and quickly joining a distant piece to a steel pipe joint member at a construction site of the steel pipe sheet pile. The purpose is to provide a construction method.

The joint structure of a steel pipe sheet pile according to the present invention is collinear with a steel pipe sheet pile having a laterally connected joint on the outer periphery, a steel pipe joint member made of a high-strength steel material and joining the steel pipe sheet pile, and the horizontal joint of the steel pipe sheet pile. In the construction site of the steel pipe sheet pile, the steel pipe joint member is joined to the steel pipe joint member by welding a mounting member made of ordinary steel in advance . They are joined by welding.

Further, the steel pipe joint member is constituted by an outer joint pipe and an inner joint pipe that is fitted into the outer joint pipe and integrally coupled thereto, and the outer joint pipe or the inner joint pipe or the outer periphery thereof is attached to the outer joint pipe. The members are joined in advance by welding .

Further, the steel pipe joint member is constituted by an outer joint pipe having a female thread and an inner joint pipe having a male screw threaded into the female thread of the outer joint pipe, and the outer joint pipe or the inner joint pipe or both of them. The attachment member is previously joined to the outer periphery of the steel plate by welding .

Moreover, the construction method of a steel pipe sheet pile according to the present invention is a construction method of a steel pipe sheet pile having a joint structure of the steel tube sheet pile, above the outer joint tube or inside the upper end portion transverse connecting joint is provided on the outer periphery A plurality of lower steel pipe sheet piles to which joint pipes are attached, and a plurality of upper steel pipe sheet piles to which the above-mentioned inner joint pipes or outer joint pipes are attached at the lower end and a laterally connected joint is provided on the outer periphery, A step of penetrating the sheet pile into the ground to join the upper steel pipe sheet pile, joining a distant piece to the joint portion by welding , and penetrating the upper steel pipe sheet pile and the lower steel pipe sheet pile into the ground; The horizontal connection joint of the next lower steel pipe sheet pile is fitted into the horizontal connection joint of the penetrated upper steel pipe sheet pile, penetrates into the ground, the next upper steel pipe sheet pile is joined to the lower steel pipe sheet pile, and the joint is connected to the joint. the distant piece by welding, and a lower steel sheet pile of this next The steel pipe piles and a step of penetrating into the ground.

According to the joint structure of a steel pipe sheet pile according to the present invention, a mounting member made of ordinary steel material is previously joined to a steel pipe joint member made of high-tensile steel material at a factory or the like, and a distant piece is attached to the mounting member at a construction site. Since joining is performed by welding, considerations such as preheating and afterheating are not required for joining, and therefore, the welding operation of the distant piece can be performed easily and in a short time.

  Moreover, the construction method of the steel pipe sheet pile according to the present invention can greatly reduce the work time required for joining the steel pipe sheet pile by adopting the above joint structure in construction, and is not affected by the weather, The construction period can be shortened.

[Embodiment 1]
FIG. 1 is a perspective view showing an example of a joint structure of steel pipe sheet piles according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a main part of FIG.
A steel pipe joint member J constituting the joint structure according to the present embodiment is welded to one steel pipe sheet pile 30 by welding to the other steel pipe sheet pile 40 and welded to the outer joint pipe 1. It is comprised from the inner joint pipe | tube 2 couple | bonded by insertion (insertion).

  Reference numeral 50 denotes a lateral coupling joint which is welded to the outer circumference in the axial direction of the steel pipe main bodies 31 and 41 constituting the steel pipe sheet piles 30 and 40 by being opposed to each other by 180 ° and welded to the adjacent steel pipe sheet piles. 50 and connected. In the figure, a transverse coupling joint 50 (see FIG. 4) having a C-shaped cross section having a slit-like opening 51 in the axial direction is shown.

The outer joint pipe 1 is formed in a cylindrical shape having the same diameter as that of the steel pipe main body 31 constituting the steel pipe sheet pile 30, and the concave portion 11 having a diameter expanded to a depth h on the inner peripheral surface on the base side (steel pipe sheet pile 30 side). The recessed portion 11 is provided with bolt insertion holes 12 at regular intervals.
15 is a mounting plate as a mounting member made of a normal steel material such as SM400, SM490, etc., and opposed to the outer peripheral surface of the outer joint pipe 1 at an interval of 180 ° in the axial direction. It is joined to the tube 1.

  The inner joint pipe 2 is formed in a substantially cylindrical shape, and a joint 21 having the same diameter as the steel pipe main body 41 constituting the steel pipe sheet pile 40 is formed on the base end side (steel pipe sheet pile 40 side). A reduced diameter portion 23 is formed in the lower portion via a step portion 22. The reduced diameter portion 23 is provided with slits 24 in the axial direction at regular intervals, and is divided into a plurality of pieces by the slits 24 to form divided pieces 25. Further, a stepped portion 26 protruding outward at a height h is formed near the tip of each divided piece 25, and corresponds to the bolt insertion hole 12 of the outer joint pipe 1 near the lower end. A screw hole 27 is provided.

In the steel pipe joint member J configured as described above, when the outer joint pipe 1 and the inner joint pipe 2 are joined, the inner joint pipe 2 is inserted into the outer joint pipe 1 by its own weight or by its own weight and a reduction force. Thereby, each divided piece 25 of the inner joint pipe 2 is bent inwardly (in the direction of diameter reduction) and fitted into the outer joint pipe 1, and the stepped portion 22 abuts on the upper end portion 14 of the outer joint pipe 1 and stops. .
At this time, as shown in FIG. 3, the step portion 26 of the inner joint pipe 2 is engaged with the upper edge step portion 13 of the recessed portion 11 of the outer joint pipe 1, and the positions of the bolt insertion holes 12 and the screw holes 27 are Align. In this state, the bolts 6 inserted into the respective bolt insertion holes 12 are screwed into the screw holes 27, and the respective divided pieces 25 are pulled toward the inner wall side of the outer joint pipe 1 and fixed.

  In the steel pipe joint member J in which the outer joint pipe 1 and the inner joint pipe 2 are joined in this manner, the upper end portion 14 of the outer joint pipe 1 and the step of the inner joint pipe 2 with respect to the compressive load in the pipe axis direction. It resists by the contact part with the part 22, and resists the tensile load at the contact part between the upper edge step part 13 of the outer joint pipe 1 and the step part 26 of the inner joint pipe 2. When a strong tensile force is applied, the split piece 25 of the inner joint pipe 2 is bent inward, and the step portion 26 may be detached from the upper edge step portion 13, so that the bolt 6 prevents this. That is, the bolt 6 is only an auxiliary means.

Next, an example of a procedure for joining the steel pipe sheet pile 30 and the steel pipe sheet pile 40 by the steel pipe joint member J configured as described above will be described.
As shown in FIG. 4, in the axial direction of the outer periphery of the steel pipe main body 31 constituting the steel pipe sheet pile 30, the lateral coupling joints 50a and 50b (hereinafter simply referred to as 50) are opposed to each other and the openings 51 are directed in different directions. In addition, the outer joint pipe 1 to which the mounting plate 15 is joined is located at the upper end portion of the steel pipe main body 31, and the mounting plate 15 is positioned on the extension line of the lateral coupling joints 50a and 50b. As shown in FIG.

Similarly, the inner joint pipe 2 is joined to the lower end portion of the steel pipe main body 41 constituting the steel pipe sheet pile 40 provided with the lateral coupling joints 50a and 50b by welding.
The joining of these laterally connected joints 50 to the steel pipe main bodies 31 and 41, the joining of the outer joint pipe 1 and the inner joint pipe 2 to the steel pipe main bodies 31 and 41, and the joining of the mounting plate 15 to the outer joint pipe 1 are performed in advance in the factory. For example, preheating and post-heating can be easily performed.

  In joining such steel pipe sheet piles 30 and 40, first, as shown in FIG. 5, the inner joint pipe 2 of the steel pipe sheet pile 40 is fitted into the outer joint pipe 1 of the steel pipe sheet pile 30 and fixed with bolts 6. . Thereby, as explained in FIG. 3, both are integrally coupled. At this time, the opening portions 51 of the upper and lower horizontal coupling joints 50a and 50a, 50b and 50b are positioned on the same line.

Then, a distance piece 52 having a length H ₁ substantially equal to the distance H between the upper and lower horizontal coupling joints 50 and made of ordinary steel having the same structure is inserted between the upper and lower horizontal coupling joints 50 and the opening thereof is opened. 53 is aligned with the opening 51 of the upper and lower horizontal coupling joints 50 and is brought into contact with the mounting plate 15 and joined by welding. As shown in FIG. 5 (b), an arc-shaped recess 16 that is substantially equal to or slightly larger than the outer diameter of the distant piece 52 is provided in the vertical direction of the mounting plate 15. The pieces 52 may be brought into contact with each other and joined by welding.

  The state at this time is shown in FIG. The steel pipe sheet piles 30 and 40 are integrally and firmly joined by the outer joint pipe 1 and the inner joint pipe 2, and the distant piece 52 is continuous with the upper and lower lateral coupling joints 50, and the opening 53 is also the same. Located on the line. In this case, when the distant piece 52 is joined to the outer joint pipe 30, it may be joined to the mounting plate 15 made of ordinary steel provided in advance in the outer joint pipe 1. Therefore, it is possible to easily weld and join at the work site.

  FIG. 7 is a perspective view of another example of the steel pipe joint member J according to the present embodiment. In this example, the mounting plate 15 is formed in a cross shape, and a bolt insertion hole 17 corresponding to the bolt insertion hole 12 of the outer joint pipe 1 is provided in the arm portion. Then, when the inner joint pipe 2 is inserted into the outer joint pipe 1 and they are integrally coupled with the bolt 6 as shown in FIG. 3, the bolt insertion hole 12 of the outer joint pipe 1 is connected from the bolt insertion hole 17. The bolt 6 inserted through is screwed into the screw hole 27 of the inner joint pipe 2 so as to be fixed integrally. Also in the mounting plate 15 of this example, as described with reference to FIG. 5B, an arcuate recess 16 may be provided in the vertical direction.

In the above description, the outer joint pipe 1 is joined to the steel pipe sheet pile 30 and the inner joint pipe 2 is joined to the steel pipe sheet pile 40. However, the inner joint pipe 2 is joined to the steel pipe sheet pile 30, and the outer joint pipe 1 is joined to the steel pipe sheet pile 40. May be joined.
Moreover, although the case where the slit 24 was provided in the inner joint pipe 2 and the diameter reducing function was provided was shown, the diameter was reduced after the inner joint pipe 2 was fitted by providing the slit in the outer joint pipe 1 to provide the diameter increasing function. And may be fixed with bolts 6.
Furthermore, although the case where the attachment plate 15 was provided in the outer joint pipe 1 was shown, it may be provided in the inner joint pipe 2 or may be provided in both the outer joint pipe 1 and the inner joint pipe 2.

Furthermore, although the case where this invention was implemented to the plug-in type steel pipe joint member J of FIG.1 and FIG.7 was shown, it is not limited to this, This invention is also applied to the plug-in type joint member of another structure. Can be implemented.
The present invention can also be implemented in a screw-in type joint member in which a female thread is provided in the outer joint pipe and a male thread is provided in the inner joint pipe. However, in this case, when the inner joint pipe is joined to the outer joint pipe, it is necessary to take measures so that the lateral coupling joints provided on the upper and lower steel pipe sheet piles are located on the same line.

  Further, in the above description, the case where the steel pipe sheet piles 30 and 40 are provided with the C-shaped lateral coupling joint 50 as shown in FIG. 8A is shown. For example, as shown in FIG. In addition, a C-shaped lateral coupling joint 50 may be attached to one side of the steel pipe body 31 (or 41), and a T-shaped lateral coupling joint 54 fitted to the other side may be attached to the other side. Moreover, as shown in FIG.8 (c), the T-shaped horizontal connection coupling 54 is attached to one side of the steel pipe main body 31 (or 41), and a pair of angle steel is attached to the other side through an opening. For example, a material having a suitable shape can be used.

  According to the present embodiment, a mounting plate 15 made of ordinary steel is previously joined to a steel pipe joint member J of a mechanical joint made of high-tensile steel at a factory or the like, and the mounting plate 15 is connected to the mounting plate 15 at a construction site. Since the stunt piece 52 is joined by welding, it is not necessary to consider preheating or afterheating for joining. For this reason, the welding operation of the distant piece 52 to the steel pipe joint member J is performed easily and in a short time. be able to.

[Embodiment 2]
This Embodiment is related with the construction method of the steel pipe sheet pile joined by the steel pipe joint member J which concerns on Embodiment 1, and an example of the process is demonstrated with FIGS. 9-11.
First, as shown in FIG. 9 (a), a steel pipe sheet pile 30 (hereinafter referred to as the bottom pipe) in which the outer joint pipe 1 to which the mounting plate 15 is joined is joined to the upper end portion and the lateral coupling joints 50a and 50b are provided on the outer peripheral surface. A steel pipe sheet pile) is inserted into the ground by placing it. At this time, the upper parts of the outer joint pipe 1 and the horizontal coupling joints 50a and 50b are exposed from the ground surface G.

Next, as shown in FIG.9 (b), the steel pipe sheet pile 40 (henceforth an upper steel pipe sheet pile) by which the inner joint pipe 2 was joined to the lower end part, and the horizontal connection joints 50a and 50b were provided in the outer periphery is used as a crane. The horizontal connection joints 50a and 50b are respectively aligned with the horizontal connection joints 50a and 50b of the lower steel pipe sheet pile 30.
And as shown in FIG.9 (c), the upper steel pipe sheet pile 30 is dropped, the inner joint pipe 2 is inserted in the outer joint pipe 1, and it couple | bonds integrally with the volt | bolt 6 (refer FIG. 3).

  Next, as shown in FIG. 9 (d), the distant pieces 52 are respectively inserted between the lateral coupling joints 50a and 50a, 50b and 50b of the upper and lower steel pipe sheet piles 30 and 40, and the opening 53 thereof is Alignment with the lateral coupling joints 50a and 50b, and joining to the mounting plate 15 provided on the outer joint pipe 1 by welding according to the procedure described in FIG.

  In this state, as shown in FIG. 10 (e), a lower steel pipe sheet pile 30 and an upper steel pipe sheet pile 40 (hereinafter referred to as a joint pipe sheet pile JP) which are joined and integrated by a steel pipe joint member J are placed. Penetration into the ground by etc. At this time, the upper part of the upper steel pipe sheet pile 40 is slightly exposed from the ground surface G.

  Next, the second lower steel pipe sheet pile 30a having the same structure as the buried lower steel pipe sheet pile 30 is lifted by a crane or the like and is positioned adjacent to the buried upper steel pipe sheet pile 40, and then, FIG. 10 (f). As shown, the second lower steel pipe sheet pile 30a is lowered, and the lateral coupling joint 50a is fitted to the lateral coupling joint 50b of the upper steel pipe sheet pile 40 (see FIG. 8A). And the 2nd lower steel pipe sheet pile 30a penetrates along the upper steel pipe sheet pile 40 by placement etc., and the upper part of the outer joint pipe 1 and the horizontal connection joint 50a, 50b is from the upper end part of the buried upper steel pipe sheet pile 40. The penetration is stopped in the state where it is positioned above.

  Next, as shown in FIG. 10 (g), the second upper steel pipe sheet pile 40a having the same structure as the buried upper steel pipe sheet pile 40 is hung with a crane or the like to be positioned on the second lower steel pipe sheet pile 30a. As shown in FIG. 11 (h), the second upper steel pipe sheet pile 40a is joined to the second lower steel pipe sheet pile 30a in the same manner as in the case of FIG. 9 (c) described above. And as shown in FIG.11 (i), the distant piece 52 is joined to the attachment plate 15 provided in the outer joint pipe 1 by welding similarly to the case of FIG.9 (d).

  Then, the transverse joint 50a of the second joint pipe sheet pile JPa joined in this way is fitted into the joint joint 50b of the joint pipe sheet pile JP previously buried, and penetrates into the ground by driving or the like. To do. At this time, since the distant piece 52 is joined to the mounting plate 15, it protrudes outward from the upper and lower horizontal coupling joints 50 by the thickness of the mounting plate 15, but as shown in FIG. The adjacent joint pipe sheet piles JP and JPa are connected with sufficient margin, so there is no problem.

  Thus, as shown in FIG. 11 (j), the previously buried joint pipe sheet pile JP and the second joint pipe sheet pile JPa are connected by the lateral connection joint 50 and are embedded in the ground in parallel. In the same manner, a steel pipe sheet pile foundation is constructed by sequentially fitting and embedding the third, fourth,... Joint pipe sheet piles JPb, JPc,... Can do. In the above description, the case where the two steel pipe sheet piles 30 and 40 are joined by the steel pipe joint member J is shown, but depending on the installation location, three or more steel pipe sheet piles may be joined. In this case, construction may be performed according to the above.

FIG. 12 is an explanatory view showing an example of a steel pipe sheet pile foundation constructed as described above. FIG. 12 (a) is a circular shape, FIG. 12 (b) is a rectangular shape, FIG. 12 (c) is an oval shape, FIG. (D) is one in which a partition wall is provided in an elliptical shape.
In this case, as shown in FIG. 8, the lateral coupling joint 50 has a margin in fitting with the lateral coupling joint 50 of the adjacent steel pipe sheet pile JP, so even when it is provided facing a position separated by 180 °. It will not hinder the connection.

However, for example, when assembled in a rectangular shape, the horizontal coupling joints 50 of the steel pipe sheet piles JP positioned at the four corners must be provided at intervals of 90 °, and when a partition wall is provided, the corresponding steel pipe sheet piles are provided. JP can appropriately change the mounting position of the horizontal coupling joint 50 according to the shape of the steel pipe sheet pile foundation, such as the need to provide three lateral coupling joints 50 at intervals of 90 °.
FIG. 12 shows an example of this, and a steel pipe sheet pile foundation having an arbitrary closed shape or open shape can be formed by appropriately installing a steel pipe sheet pile and connecting the lateral coupling joint 50.

  According to the present embodiment, when joining a large number of lower steel pipe sheet piles 30 and upper steel pipe sheet piles 40 constituting a steel pipe sheet pile foundation with the steel pipe joint member J, the steel plate joint member J is provided with the mounting plate 15 made of ordinary steel in advance. Therefore, the distant piece 52 can be easily joined in a short time without considering temperature control or the like or being influenced by the weather. For this reason, the working time is greatly reduced, and the construction period can be shortened.

It is an isometric view explanatory drawing of the joint structure of the steel pipe sheet pile which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the principal part of the steel pipe joint member of FIG. It is a longitudinal cross-sectional view of the principal part which shows the state which joined the steel pipe coupling member of FIG. It is explanatory drawing of a steel pipe sheet pile, a top view, and a top view of a horizontal coupling joint. It is explanatory drawing of the joining procedure of a steel pipe coupling member. It is explanatory drawing which shows the state which joined the steel pipe coupling member. It is a perspective explanatory view showing other examples of the steel pipe joint member of Embodiment 1. It is explanatory drawing which shows the example of a horizontal connection joint. It is explanatory drawing of the construction procedure of the steel pipe sheet pile joined by the steel pipe joint member of Embodiment 1. It is explanatory drawing of the construction procedure of the steel pipe sheet pile joined by the steel pipe joint member of Embodiment 1. It is explanatory drawing of the construction procedure of the steel pipe sheet pile joined by the steel pipe joint member of Embodiment 1. It is explanatory drawing of the example of the steel pipe sheet pile foundation formed with a steel pipe sheet pile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer joint pipe, 2 Inner joint pipe, 15 Mounting plate (mounting member) , 30, 40 Steel pipe sheet pile, 50 (50a, 50b) Lateral coupling joint, 51 Opening part, 52 Distant piece, J Steel pipe joint member, JP Joint Steel pipe sheet pile.

Claims (4)

A steel pipe sheet pile provided with a laterally connected joint on the outer periphery, a steel pipe joint member made of high-strength steel, and joined to the steel pipe joint member on the same line as the laterally connected joint of the steel pipe sheet pile A piece and
A steel pipe sheet pile joint, wherein an attachment member made of ordinary steel is joined to the steel pipe joint member by welding in advance , and the distant piece is joined to the attachment member by welding at a construction site of the steel pipe sheet pile. Construction. The steel pipe joint member, constituted by an inner joint pipe to be coupled integrally fitted to the outer joint pipe and the outer joint pipe, the mounting member in advance to the outer joint tube or inner joint pipe or the outer periphery of both 2. The steel pipe sheet pile joint structure according to claim 1, wherein the steel pipe sheet pile joint structure is joined by welding . The steel pipe joint member is constituted by an outer joint pipe having a female thread and an inner joint pipe having a male thread to be screwed into the female thread of the outer joint pipe. 2. The steel pipe sheet pile joint structure according to claim 1, wherein the attachment member is joined in advance by welding . A construction method for a steel pipe sheet pile comprising the joint structure of the steel pipe sheet pile according to claim 2 or 3,
A plurality of lower steel sheet pile outer joint tube or inner joint tube transverse connecting joint according to claim at the upper end portion is provided with 2 or claim 3 is attached to the outer periphery, claim a lower end portion transverse connecting joint is provided on the outer periphery 2 or a plurality of upper steel pipe sheet piles attached with the inner joint pipe or the outer joint pipe of claim 3,
A step of penetrating the lower steel pipe sheet pile into the ground to join the upper steel pipe sheet pile, joining a distant piece to the joint portion by welding , and penetrating the upper steel pipe sheet pile and the lower steel pipe sheet pile into the ground;
The horizontal coupling joint of the next lower steel pipe sheet pile is fitted to the horizontal coupling joint of the upper steel pipe sheet pile penetrated into the ground and penetrated into the ground, and the next upper steel pipe sheet pile is joined to the lower steel pipe sheet pile. A method for constructing a steel pipe sheet pile comprising: joining a distant piece to a joint portion by welding, and inserting the next lower steel pipe sheet pile and an upper steel pipe sheet pile into the ground.

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