JP2000301201A - Manufacture of h-shaped sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure breakaway strength by obtaining a small projection having a desired shape inside a double-claw joint part in only a rolling stage. SOLUTION: In this manufacturing method, after forming an H-shaped rough shape billet with a roughing mill, the rough shape billet is rough rolled with a roughing universal mill group consisting a universal mill and an edger mill. Next, only the joint part of a material to be rolled which is rough rolled with at least one universal mill of an intermediate universal mill group consisting of one or more universal mills is reduced and formed. Moreover, the doubleclaw joint part of the joint part of the material to be rolled which is reduced and formed with at least one universal mill of the intermediate universal mill group is bent and formed with a finishing universal mill.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an H-shaped sheet pile, in which at least one flange of the H-shaped sheet pile has one end with a double-claw joint and the other end with a single-claw joint. And a method of manufacturing an H-shaped sheet pile.

[0002]

2. Description of the Related Art In civil engineering and construction works such as large seawalls, quay walls, and mountain retaining lands, sectional performance is required to form continuous walls.
That is, there is a need for a sheet pile having high bending rigidity per unit cross-sectional area, and excellent in waterproofness and workability. For this reason, steel pipe sheet piles and H-shaped sheet piles are often used as sheet piles in the above works.

[0003] Steel pipe sheet piles are formed by welding joints to steel pipes, and H-shaped steel sheet piles are mainly produced by manufacturing straight steel sheet piles and H-shaped steels or straight steel sheet piles and steel sheets separately and welding them. It is used for Therefore, the manufacturing cost of the steel pipe sheet pile and the H-shaped steel sheet pile as described above is higher than that of the U-shaped steel sheet pile that can be manufactured only by the rolling process.

On the other hand, some H-shaped sheet piles have a fitting joint formed at the end of the flange of the H-shaped steel only by a rolling process.
The manufacturing technique is disclosed, for example, in JP-A-56-109102 and JP-A-54-11061.

Japanese Unexamined Patent Publication (Kokai) No. 56-109102 discloses that a rough material having a symmetrical H-shaped cross-sectional shape is roughly rolled into an H-shaped rough steel slab while maintaining a substantially symmetrical shape by a rough universal rolling mill and a rough shaping mill. Then, a "method for manufacturing an asymmetric H-shaped steel sheet pile" in which a joint is formed on one flange of the H-shaped crude steel slab by a finishing universal rolling mill or the like, and a superimposed piece is formed on the other flange to be shaped. Proposed.

Japanese Patent Application Laid-Open No. 54-11061 discloses that
After producing the coarse H-shaped ingot, the coarse H-shaped ingot is roughly rolled into an H-shaped rough shaped steel slab by a rough universal rolling mill and a rough shaping rolling mill, and then the H-shaped rough shaped steel slab is interposed. There has been proposed a “method of manufacturing an H-shaped sheet pile” in which intermediate rolling is performed by a universal rolling mill and an intermediate shaping rolling mill, and then finish rolling is performed by a finishing universal rolling mill.

However, even if rolling is performed according to the technique proposed in these publications, a desired shape as a fitting joint cannot be reliably given, and therefore, the following problem of detachment may occur. there were.

That is, the H-shaped steel sheet pile has a single claw joint inserted into a portion surrounded by the double claw joint to form a steel sheet pile wall, but a small projection inside the double claw joint is provided. If the height of the part is not enough, when the pulling force acts in the longitudinal direction of the wall of the H-shaped steel sheet pile, the single-claw joint is caught between the outer joint and the small protrusion of the double-claw joint. And easily come off.

According to the technique proposed in Japanese Patent Application Laid-Open No. 56-109102, simply rolling back and forth using a coarse universal rolling mill and a rough shaping rolling mill simply results in a small projection on the inner side of the double pawl joint. The plastic strain applied to the outer joint portion and the flange portion of the double-claw joint portion is extremely small, so that the height of the small protrusion inside the double-claw joint portion is pulled by the elongation in the rolling direction of the flange. This is because it is unavoidable that the number of particles decreases.

In addition, according to the technique proposed in Japanese Patent Application Laid-Open No. 54-11061, reciprocating rolling is simply performed using an intermediate universal rolling mill and an intermediate shaping rolling mill. This is because it is difficult to secure a desired height to the small projection of the double pawl joint because the flange is lowered. In this case, furthermore, in the latter half pass of the rough universal rolling, the thickness of the outer joint portion of the double pawl joint portion becomes thin, so that the outer joint portion buckles during rough shaping rolling, and the outer joint portion length in the rolling direction. Therefore, there was also a problem that the next step, that is, a bite between the horizontal roll and the vertical roll of the intermediate universal rolling mill, occurred.

If the length of the outer joint portion of the double-claw joint portion is not uniform or if the double-claw joint portion is bitten, there is a problem that the outer joint portion cannot be bent.
For this reason, for example, as described in JP-A-56-109102 as an example thereof, a double-claw joint is formed by a guide with a roller before bending the joint by a finishing universal rolling mill. It was necessary to bend the outer joint tip in advance.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to obtain a small projection having a desired shape inside a double-claw joint by a rolling process alone, It is an object of the present invention to provide a method for manufacturing an H-section steel sheet pile capable of securing a required detachment strength.

[0013]

The gist of the present invention resides in the following method (1) to (4) for manufacturing a H-shaped sheet pile.

(1) A method for manufacturing an H-section steel sheet pile in which one end of at least one flange is a double-jaw joint and the other end is a single-jaw joint, wherein the H-shaped rough steel is formed by a rough rolling mill. After shaping the pieces, the rough shaped steel pieces are roughly rolled by a rough universal rolling mill group consisting of a universal rolling mill and an edger rolling mill,
Subsequently, only the joint portion of the rough-rolled material to be rolled by at least one universal rolling mill of an intermediate universal rolling mill group consisting of one or more universal rolling mills is rolled and formed, and further, the finishing universal rolling mill is used to perform the above-described rolling. A method of manufacturing an H-shaped steel sheet pile, wherein a double-claw joint portion is formed by bending at least one universal rolling mill of a group of intermediate universal rolling mills among joint portions of a material to be rolled down.

Here, the double-claw joint portion refers to a joint portion having a long outer joint portion, a short small protrusion portion, and a concave portion therebetween, and the single-claw joint portion is a convex joint fitted to the concave portion. Refers to the department.

(2) The double-claw joint portion of the material to be rolled rough-rolled in the group of coarse universal rolling mills is restrained by grooves provided in horizontal rolls of at least one universal rolling mill in the intermediate universal rolling mill group. The method for manufacturing an H-shaped steel sheet pile according to the above (1), characterized in that the double-claw joint is formed by lowering and raising a lower surface of the double-claw joint of the material to be rolled by a vertical roll.

(3) After at least one universal rolling mill in the group of intermediate universal rolling mills press-molds the joint portion of the material to be rolled, the vertical jaw of the finishing universal rolling mill forms the double-claw joint portion of the joint portion. The method for manufacturing an H-shaped sheet pile according to the above (1), wherein the outer end of the joint portion is pressed down by a groove provided on a horizontal roll while supporting the lower surface, and bending is performed.

(4) The double-claw joint portion of the material to be rolled rough-rolled by the rough universal rolling mill group is restrained by a groove provided on a horizontal roll of at least one universal rolling mill in the intermediate universal rolling mill group. The lower surface of the double-claw joint portion of the material to be rolled is pushed up by a vertical roll to form a double-claw joint portion, and the lower surface of the double-claw joint portion of the joint portion is formed by a vertical roll of a finishing universal rolling mill. The method of manufacturing an H-shaped sheet pile according to the above (1), characterized in that the outer end of the joint portion is pressed down by a groove provided in a horizontal roll while being supported, and bending is performed.

Hereinafter, the inventions described in the above (1) to (4) are referred to as inventions (1) to (4), respectively.

The main purpose of reciprocating rolling in a group of coarse universal rolling mills consisting of a rough universal rolling mill and a rough shaping mill is to elongate the material to be rolled by reducing the thickness. Therefore, it is not possible to simultaneously obtain desired dimensions and shapes for the outer joint portion and the inner small protrusion portion of the double-jaw joint portion only by reciprocating rolling with the above-mentioned coarse universal rolling mill group.

Therefore, the inventors of the present invention have desired dimensions and sizes for both the outer joint portion and the inner small projection portion of the double pawl joint portion.
Various rolling methods were studied for the purpose of securing the shape. As a result, the following findings were obtained.

During rolling by the group of coarse universal rolling mills, the outer joint portion is reduced, and the height of the small projection inside the double-jawed joint portion is reduced by the accompanying stretching. The cross-sectional shape of the material to be rolled later is
For example, it is as shown in FIG. In addition, the broken line in FIG. 1 has shown the cross-sectional shape of the crude steel slab before rolling by a rough universal rolling mill group.

In order to give a desired size and shape to the small projection inside the double-jaw joint, at least one of the intermediate universal rolling mills after rolling by the coarse universal rolling mills is used.
The height of the small projections and the thickness of the small projections may be increased by locally reducing the distal end of the flange portion by a universal rolling mill.

The local reduction of the flange tip by at least one universal rolling mill in the intermediate universal rolling mill group may be performed, for example, by a method as shown in FIG. That is, the flange portion and the web portion are restrained from stretching in the rolling direction of the material to be rolled without rolling down, and then at least one universal rolling mill in the intermediate universal rolling mill group is double-rolled by the upper horizontal roll. What is necessary is just to press down the small protrusion inside the nail joint part, and to push down the double nail joint part from below with a vertical roll. On this occasion,
If the outer joint portion of the double claw joint portion is constrained by the groove provided in the upper horizontal roll, the tip of the outer joint portion caused by pushing up by the vertical roll can be prevented from biting. In addition, the broken line in FIG. 2 shows the cross-sectional shape of the material to be rolled after rough rolling by the rough universal rolling mill group.

The outer joint portion bending of the double pawl joint portion is performed as follows.
A finishing universal rolling mill may be used.

The outer joint part bending of the double nail joint part by the finishing universal mill rolling machine is, for example,
What is necessary is just to carry out by the method as shown in FIG. In other words, the vertical roll of the finishing universal rolling mill only needs to support the lower surface of the double-jaw joint portion, and the groove formed in the upper horizontal roll may press down the tip of the outer joint portion of the double-jaw joint portion to perform bending. .
According to this method, it is not necessary to bend the tip of the outer joint portion of the double-claw joint portion with, for example, a guide with a roller before bending the joint portion by the finishing universal rolling mill. In addition, the broken line in FIG. 3 shows the cross-sectional shape of the material to be rolled after rolling by the intermediate universal rolling mill group.

The present invention has been completed based on the above findings.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

First, according to the method of manufacturing an H-section steel sheet pile of the present invention, the shaping of an H-shaped rough steel slab by a rough rolling mill and the rough rolling by a group of coarse universal rolling mills are performed in the same manner as in the conventional method. Just do it.
Next, only the joint portion of the roughly-rolled material to be rolled is subjected to reduction molding by at least one universal rolling mill in the intermediate universal rolling mill group.

In the above reduction molding, for example, as shown in FIG. 2, at least one universal rolling mill in the intermediate universal rolling mill group is rolled down by an upper horizontal roll of a small projection inside a double-claw joint. In addition, a vertical roll is used to push down the double claw joint from below to secure the small protrusion size and shape inside the double claw joint to form the double claw joint, What is necessary is just to carry out by shaping | molding the single-claw joint part by a method. At this time, it is preferable that the outer joint portion, the flange portion, and the web portion of the double claw joint portion are not lowered. If the outer joint portion of the double-claw joint portion is restrained by the groove provided on the upper horizontal roll during the above-described rolling, it is possible to prevent the tip of the outer joint portion from being bitten by the pushing up by the vertical roll.

After at least one universal rolling mill in the group of intermediate universal rolling mills described above press-molds only the joint portion, the outer joint portion of the double-jaw joint portion is bent by a finishing universal rolling mill. In this bending, for example, as shown in FIG. 3, the vertical roll of the finishing universal rolling mill only supports the lower surface of the double-jaw joint, and the outer joint of the double-jaw joint is formed by the groove provided in the upper horizontal roll. What is necessary is just to press down the front end and perform bending.

FIG. 4 is a graph showing the results of an investigation of the change in the height of the small projections of the double-jaw joint portion during reciprocating rolling by the group of coarse universal rolling mills in a 1/8 model lead rolling experiment of the actual machine. It is shown in terms of dimensions. For the small projection height of the double claw joint of the product of 25 mm, the depth of all of the horizontal projections of the horizontal roll of the rough universal rolling mill group is 30
mm. In FIG. 4, "UR" indicates rolling by a universal rolling mill, and "E" indicates rolling by an edger rolling mill.

In the first half of the rolling pass in the group of coarse universal rolling mills, the outer joint portion of the double-jaw joint portion is not lowered, and the height of the small projection portion of the double-jaw joint portion is reduced by locally reducing the flange tip. It increases to the full hole shape of the horizontal roll of the rough universal mill group, that is, to 30 mm. However, in the second half of the rolling pass in which the reduction of the outer joint portion of the double-claw joint portion began, the height of the small protrusion portion of the double-claw joint portion decreased for each rolling pass, and decreased to 13 mm in the final pass. As shown in FIG. 1, in the second half of the rolling pass, the small projections of the double pawl joint portion do not come into contact with the horizontal roll, so that a stable dimension in the rolling direction cannot be obtained.

FIG. 5 shows the relationship between the height of the small projections of the double-jawed joint and the reduction in the area of the joint during rolling in the intermediate universal rolling mill group in a lead rolling experiment of a 1/8 model of the actual machine. The result. Also in FIG. 5, the dimensions are shown in terms of actual dimensions. The “area reduction rate of the joint” is obtained by dividing the area of the joint reduced by the intermediate universal rolling mill group by the area of the entire joint after the reduction by the intermediate universal rolling mill group.

In this model experiment, in both the case where the joint is formed while the flange is being pressed down and the case where only the joint is formed, the hole shape of the horizontal roll of the small protrusion of the intermediate universal rolling mill group is used. The height of the small projections was investigated while the depth was set to a constant value of 30 mm and the tip of the small projections was not pressed down. The amount of reduction in the groove bottom of the joint by the horizontal rolls of the group of intermediate universal rolling mills was a constant value of 18 mm in the depth direction, and the reduction in area of the joint was changed by changing the reduction area by the vertical roll.

As shown in FIG. 5, the height of the small protrusion of the double-claw joint increases with an increase in the area reduction rate of the joint. Since the effect of stretching the rolled material increases, the height of the small projections decreases rather. Therefore, in order to increase the height of the small projections by the reduction in the intermediate universal rolling mill group, it is preferable to set the joint area reduction rate to 10 to 20%.

Further, with the increase in the rolling reduction of the flange portion, 2
Since the amount of increase in the height of the small projections of the heavy pawl joint is reduced, it is preferable that the flanges are not lowered when the intermediate universal rolling mills are lowered.

When the outer joint portion of the double-claw joint portion is formed, if rolling is performed while restricting the tip by a groove (a hole type) provided in a horizontal roll of the intermediate universal rolling mill group, biting does not occur. The length of the outer joint portion can be made uniform.
Even if the thickness between the horizontal and vertical rolls of the intermediate universal rolling mill group increases at the front and rear ends of the material to be rolled, there is no problem in bending the double-claw joint by the finishing universal rolling mill. Absent.

When bending a double-claw joint by a finishing universal rolling mill, a groove (hole type) provided on a horizontal roll.
If bending is performed in the above manner, there is no occurrence of biting over the entire length in the rolling direction, so that good bending can be performed without having to bend the outer joint tip in advance before bending the double nail joint. .

Next, the present invention will be described in more detail with reference to examples.

[0041]

EXAMPLE An H-shaped sheet pile having dimensions and shapes shown in FIG. 7 was manufactured by a rolling line shown in the mill layout of FIG. The web thickness of the product described in FIG. 7 is 15 mm, the flange thickness is 20 mm, and the maximum thickness of the double pawl joint is 55 mm. In addition, the specified value of the small protrusion height of the double claw joint is 25.
mm, the target is 20 mm or more.

First, a continuously cast slab having a thickness of 250 mm and a width of 1500 mm was used as a rolled material, and this was heated in a heating furnace for 128 minutes.
After heating to 0 ° C., reciprocating rolling of 19 passes was performed with a rough rolling mill to obtain a web having a thickness of 60 mm and a flange width of 62 mm as shown in FIG.
A 0-mm H-shaped crude steel slab (beam blank) was produced. In the next step, the rough universal rolling mill group, 2
A V-shaped groove having a depth of 23 mm was provided at the center of the flange at the center of the H-shaped rough steel slab by rough rolling so that the heavy nail joint portion could be easily formed.

Next, the above H-shaped rough steel slab is roughly rolled by a group of coarse universal rolling mills consisting of a universal rolling mill and an edger rolling mill, and has a web thickness of 15.2 mm and a flange central portion thickness of 20.2 mm. Pressure down. The rough rolling was performed by reciprocating rolling of 13 passes, and the thickness of the flange at the groove bottom of the double-jaw joint was set to 55.2 mm.

The depth of the groove (hole) provided at the portion corresponding to the small protrusion of the upper horizontal roll of the coarse universal rolling mill was 25 mm, and the shape of the vertical roll of the coarse universal rolling mill was as shown in FIG. In comparison with the vertical roll shape of the intermediate universal rolling mill group, the flange thickness below the double pawl joint was tapered. The taper start point on the outer surface of the outer joint portion of the double-claw joint portion is fixed, and the position of the taper end point is 0 mm, 25 mm, and 50 mm below the position of the taper end point of the vertical rolls of the intermediate universal rolling mill group. Rough rolling was performed for the case. As a result of rough rolling under the above conditions, the height of the small protrusion of the double nail joint was 8 to 10 mm under any conditions.

After performing the rough rolling under the above-described various conditions, only the joint at the tip of the flange was reduced in the intermediate universal rolling mill group. That is, the bottom of the groove of each of the double-claw joints is 18 m by a horizontal roll of a group of intermediate universal rolling mills.
m, and 0 mm with a vertical roll on the lower surface (in this case,
"Condition 1"), 25 mm (in this case, hereinafter referred to as "condition 2"), and 50 mm (in this case, hereinafter referred to as "condition 3"). However, the tip of the outer joint is shown in Fig. 2.
And constrained by grooves (holes) provided in the horizontal rolls of the group of intermediate universal rolling mills as shown in FIG. The above conditions 1-3
In the case of (1), the reduction rates of the joint portions in the intermediate universal rolling mill group are 8%, 16%, and 24%, respectively.

In the above-mentioned intermediate universal rolling mill group, only the roll opening was opened and the material to be rolled was passed until the 12th pass, and only the joint at the tip of the flange was reduced in the 13th pass. .

Table 1 summarizes the rolling conditions in the intermediate universal rolling mill group and the heights of the small projections after the rolling.

[0048]

[Table 1]

From Table 1, it can be seen that when the double-jaw joint is lowered by the method of the invention of (1), that is, the method of “condition 1,” the height of the small projection of the double-jaw joint is 20 to 21 mm. Yes, it can be seen that the target value can be obtained. (2) the method of the invention,
In other words, when the lower surface of the double pawl joint is pushed up by a vertical roll by the method of “Condition 2” or “Condition 3”, the height of the small protrusion of the double pawl joint is more preferably 24 to 25 mm. Is also clear.

By restraining the tip of the outer joint portion, there is no problem that the tip of the outer joint portion starts to bite when the lower surface of the double claw joint portion is pushed up, and the length of the outer joint portion can be made uniform. Was.

Then, only the joints were pressed down under the various conditions described above, and then the double-claw joints were bent and formed using a finishing universal rolling mill to obtain the desired H-shaped steel sheet pile 500 × 5.
Finished in the 00 series. In addition, the upper horizontal roll of the finishing universal rolling mill is provided with a groove portion (hole type) having a depth of 60 mm and a width of 60 mm at a portion corresponding to the bending of the double claw joint portion. In the same manner as the vertical roll of the intermediate universal rolling mill, the double-claw joint was not lowered and only supported the lower surface.

In the above method, that is, the method of the invention of (3), the H-shaped sheet pile 500 × 500 series 2 in which the double-jaw joint is bent by a finishing universal rolling mill.
Since the outer joint portion of the heavy nail joint portion is formed by bending the tip thereof along the inner surface of the groove portion (hole type), the outer joint portion can be reduced in any of the intermediate universal rolling mill groups (“conditions 1 to 3”). It did not buckle, and the joint length was constant. In addition, there was no outward fall and the shape was stable and good in the rolling direction.

In particular, when the reduction in the intermediate universal rolling mill group is "condition 2" and "condition 3", the double-claw joint is bent by the finishing universal rolling machine, that is, ( The shape of the double nail joint of the H-shaped steel sheet pile 500 × 500 series manufactured by the method of the invention 4) has a small projection height of 24 to 25 mm, and the outer joint is stable in the rolling direction. It had a good shape.

[0054]

According to the present invention, an H-shaped steel sheet pile having a small projection of a desired shape inside a double-jaw joint can be obtained only by a rolling step, so that the detachment strength required for the joint is reduced. Can be secured.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a cross-sectional shape of a material to be rolled after being rolled by a group of coarse universal rolling mills according to the present invention.

FIG. 2 is a diagram showing an example of a situation in which a front end of a flange portion is locally reduced in an intermediate universal rolling mill group according to the present invention.

FIG. 3 is a view showing an example of bending an outer joint portion of a double-jaw joint portion by a finishing universal mill rolling mill according to the present invention.

FIG. 4 is a diagram showing the results of a change in the height of small projections of a double-jaw joint portion when rolling is performed by a group of coarse universal rolling mills, in a 1/8 model lead rolling test of an actual machine.

FIG. 5 is a diagram showing the relationship between the height of small projections of a double-jaw joint and the reduction in area of the joint during rolling in a group of intermediate universal rolling mills in a 1/8 model lead rolling experiment of an actual machine.

FIG. 6 shows a layout of a rolling mill used in an example to carry out a method according to the present invention.

FIG. 7 is a diagram showing an example of the dimensions and shape of the H-shaped sheet pile manufactured in the example.

FIG. 8 is a view showing an H-shaped rough steel slab formed by a rough rolling mill for H-shaped sheet piles manufactured in an example.

Claims (4)

[Claims] 1. A method for manufacturing an H-section steel sheet pile, wherein at least one flange has one end having a double-jaw joint and the other end having a single-jaw joint, wherein the H-shaped rough steel slab is formed by a rough rolling mill. After modeling
The coarse shaped billet is roughly rolled by a coarse universal rolling mill group consisting of a universal rolling mill and an edger rolling mill, and then by at least one universal rolling mill of an intermediate universal rolling mill group consisting of one or more universal rolling mills. Only the joint portion of the rough-rolled material to be rolled is subjected to reduction molding, and further, the joint portion of the material to be rolled-molded by a finishing universal rolling mill by at least one universal rolling mill of the intermediate universal rolling mill group. Of which 2
A method for manufacturing an H-shaped steel sheet pile, comprising bending a heavy claw joint. Here, the double-claw joint portion refers to a joint portion having a long outer joint portion, a short small protrusion portion, and a concave portion therebetween, and the single-claw joint portion refers to a convex joint portion fitted into the concave portion. . 2. Rolling down a double-claw joint portion of a material to be rolled which has been rough-rolled by a group of coarse universal rolling mills while constraining the groove portion provided on a horizontal roll of at least one universal rolling mill in the intermediate universal rolling mill group. And the lower surface of the double claw joint of the material to be rolled is pushed up by a vertical roll to
The method for manufacturing an H-shaped steel sheet pile according to claim 1, wherein the heavy nail joint is formed. 3. At least one of a group of intermediate universal rolling mills
After rolling down the joint part of the material to be rolled with the universal rolling mill, the vertical outer roll of the finishing universal rolling machine supports the lower surface of the double-claw joint part of the joint part while turning the outer end of the joint part into a horizontal roll. The method for manufacturing an H-shaped steel sheet pile according to claim 1, wherein bending is performed by rolling down the groove provided. 4. Rolling down a double-claw joint portion of a material to be rolled which has been roughly rolled by a group of coarse universal rolling mills while constraining the groove portion provided on a horizontal roll of at least one universal rolling mill in the intermediate universal rolling mill group. And the lower surface of the double claw joint of the material to be rolled is pushed up by a vertical roll to
While forming the heavy nail joint and supporting the lower surface of the double nail joint among the joints with the vertical roll of the finishing universal rolling mill, the outer end of the joint is pressed down and bent by the groove provided on the horizontal roll. The method for manufacturing an H-shaped sheet pile according to claim 1, wherein forming is performed.