JP3173389B2 - Asymmetric steel sheet pile and its hot rolling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot rolling method for a steel sheet pile having an asymmetric joint shape among various steel sheet piles used for civil engineering and construction. The present invention further relates to a structure of a corner steel sheet pile used for a corner portion of a steel sheet pile wall and a method of manufacturing the same.

[0002]

2. Description of the Related Art There are various types of steel sheet piles, and among them, a general one is a U-shaped steel sheet pile having a trapezoidal cross section. Hereinafter, a U-shaped sheet pile will be described as an example of a steel sheet pile.

Recently, there is a problem in forming a wall using a conventional U-shaped steel sheet pile, that is, since the steel sheet pile must be driven upside down for each sheet, the construction period of the wall is prolonged. In addition, the wall thickness (width) is larger than that of the construction method using small H-section steel, and in the suburban area where close construction with the adjacent land is required from the viewpoint of effective utilization of land. However, there is a problem that it is not suitable for construction. In order to solve such a problem, the present applicant has disclosed Japanese Patent Laid-Open No.
No. 0928 discloses a U-shaped sheet pile having a completely new asymmetric joint.

FIG. 1 shows a steel sheet pile (hereinafter, simply referred to as asymmetric steel sheet pile) 30 having an asymmetrical joint shape which is the subject of the present invention.
4, and composed of joints 36, 38 provided asymmetrically on both sides.

FIG. 2A is an explanatory view schematically showing an example of a combination in which the asymmetric steel sheet pile 30 is actually used for earth retaining, etc., and shows a case in which a conventional symmetric steel sheet pile 40 is used. FIG.
It can be seen that the space can be effectively used as compared with (b). In the figure, the area shown by the broken line is the machine occupied area,
If such a work area can be secured, this indicates an area where steel sheet pile can be driven into the soil at the site. The smaller the value is, the more the work in a narrow area is possible. Also, it can be seen that the thickness (D ₁ , D ₂ ) of the wall is much narrower in the case of FIG. 2 (a).

As described above, according to the above-mentioned asymmetric U-shaped sheet pile, it is possible to continuously drive steel sheet piles in the same direction when forming a sheet pile wall as shown in FIG. 2 (a). The wall thus formed has a cross-sectional rigidity equal to or higher than that of a conventional symmetric U-shaped sheet pile.

By the way, as is well known, U-shaped steel sheet piles are put into the ground by connecting joints at both ends alternately, and continuous earth retaining is performed. A steel sheet pile for a corner having a cross section different from the other portions at the corners is used. Hereinafter, this is called a corner steel sheet pile.

Conventionally, such corner steel sheet piles have been disclosed in Japanese Patent Publication No. 64-8139, Japanese Patent Publication No. 2-60807,
Some are disclosed in Japanese Patent Publication No. Hei 6-9682,
As a method of manufacturing the same, Japanese Patent Publication No. 64-10281,
There is a method disclosed in Japanese Patent Publication No. 6-9682.

[0009] Even when the U-shaped steel sheet pile having the above-mentioned new asymmetric joint is continuously driven, similarly to the conventional symmetric steel sheet pile wall, the main axis as a whole horizontal cross section of the steel sheet pile row, the so-called wall axis, changes direction. In particular, there are many construction examples in which a continuous driving is performed through a corner portion that changes in a substantially right angle direction to surround a boundary where soil retaining is to be performed, and such a corner portion has a specially shaped corner steel sheet pile. I have to use

That is, as shown in FIG. 3 (a), the same U-shaped steel sheet pile is cut on a web back surface 42 of a U-shaped steel sheet pile 40 by a web, and a half thereof is fixed by welding (hereinafter referred to as a T-shaped sheet pile). 4A, or a type in which the center of a web 44 of a U-shaped sheet pile 40 is bent and the inner corners thereof are appropriately welded as shown in FIG. 4A (hereinafter referred to as W-shaped). FIGS. 3 (b) and 4 (b) are schematic explanatory views each schematically showing a form of driving at a corner portion.

However, the T type has a weight of approximately 1.5.
In addition, it is difficult to grip the chuck of a vibro pile driving machine usually used for driving this kind of steel sheet pile, and it is not convenient to store and transport because it cannot be stacked. On the other hand, even if reinforcement welding is performed on the W type, the section modulus is still very small, so it is difficult to ensure the safety of earth retaining, and, like the T type, the method of chucking and driving with a pile driver May be limited to

By the way, as for the above-mentioned method of manufacturing an asymmetric U-shaped sheet pile, a method by welding is generally used, and particularly a method by hot rolling has not been proposed so far. In this case, each joint was manufactured in the same manner as a conventional symmetric U-shaped steel sheet by performing a plurality of passes in a stepwise manner by using a plurality of grooved rolls. Therefore, a conventional method of manufacturing a U-shaped steel sheet pile having a symmetrical cross-sectional shape by hot rolling will be described below. In such prior art, the deformation process leading to the product proceeds symmetrically, ignoring the effects of the geometrical variation and the temperature distribution of the rolling material, the variation of the friction condition between the rolling material and the grooved roll, and the like. , And the roll hole type is also designed symmetrically.

[0013] That is, the same applies to the joint bending forming process. In the final stage of rolling, the joint bending is performed simultaneously in the same pass by the left-right symmetrical grooved roll in the same pass.

FIGS. 5 (a) and 5 (b) show the pre-bending holes formed by upper and lower rolls, respectively, of the hot-rolled roll dies of a generally symmetrical U-shaped sheet pile. Type (K
-2) and a bending finish hole type (K-1). In the drawing, the rolled material, which is a U-shaped steel sheet pile composed of the flange portions 10, the web portion 12, and the joint portions 14 at both ends, was already hot-rolled at the stage of FIG. 5 (a) except for the bending of the joint portions. Rolling is almost finished,
After adjusting the joint thickness and the joint height with the die (K-2), the joint is bent and formed with the die (K-1) shown in FIG.

FIG. 6 shows the joint bending process in the die (K-1) in more detail, and the process is roughly divided into the following four stages. As the rolled material, only a portion including the flange portion 10, the web portion 12, and the joint portion 14 is shown.

In the figure, as shown as K-2 release,
After exiting (K-2), in step (a), deformation before roll contact is effected due to the influence of the front part of the U-shaped sheet pile during roll engagement, which mainly results in a reduction in the width of the steel sheet pile. . However, "width" is the width of the entire U-shaped sheet pile. In the step (b), the width reduction and the joint bending are started due to the outer surface contact of the collar portion 20 of the upper roll 18 with the joint.

Next, in step (c), contact between the lower roll 22 and the joint occurs, and the process reaches step (d), where the upper and lower rolls 18
The bending of the joint is completed by pressing down the joint portion 22 to obtain a steel sheet pile product indicated as K-1 release.

As shown in FIGS. 5 and 6, when the rolled material and the product shape are symmetrical, the above-described bending process is also symmetrical, so that there is a left-right difference in the posture of the rolled material before and after the roll is engaged. Absent.

However, when the rolled material and the product shape are asymmetrical, particularly when the joint is provided asymmetrically, the bending deformation of the rolled material in a cross section perpendicular to the rolling direction is not symmetrical. Therefore, there is a left-right difference in the posture of the rolled material before and after the roll biting,
This causes unstable rolling posture or incomplete joint bending.

As described above, when an asymmetric steel sheet pile is manufactured by the hot rolling method, there is no particular problem even if the joint portion is formed asymmetrically or hot-rolled at the same time until the joint is bent. Although it does not come to an end, at the stage of bending forming, which is the finish rolling process, if this is performed simultaneously on the left and right using a grooved roll, the joint part is asymmetrical left and right, as described above, it is incomplete due to instability of the rolling posture Bending is performed, resulting in a decrease in yield.

[0021]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hot rolled steel sheet pile having a cross-sectionally asymmetrical joint shape, in which the rolling posture is unstable when performing joint bending. An object of the present invention is to provide a hot rolling method for asymmetric steel sheet piles that can obtain a good joint shape without incomplete joint forming.

Still another object of the present invention is to prevent a problem of chucking of a pile driver at the time of driving and a problem at the time of transport and storage of a steel sheet pile, and to solve the problem disclosed in Japanese Patent Application Laid-Open No. H5-140928. An object of the present invention is to provide a corner steel sheet pile applicable to a U-shaped sheet pile having an asymmetric joint and a method for manufacturing the same.

[0023]

Of course, in order to solve the above-mentioned problems, the above-mentioned problem of the rolling posture can be solved by gradually forming the asymmetrical joints on both sides in multiple stages. However, it is not economical and not practical to perform rolling many times in multiple stages.

Therefore, the present inventors focused on performing the left and right joint bending at once using different roll hole dies, and separately divided the bending, which had been performed once at the same time to the left and right simultaneously. As a result, the present inventors have found that the above-mentioned problems can be effectively solved, and have completed the present invention.

Further, the present inventors prototyped various corner steel sheet piles for the asymmetrical U-shaped steel sheet pile having the above-mentioned new joint shape, performed a casting test, and found that one of the joints was bent inward. As a result, the present inventors have found that the steel sheet pile wall can be turned to the right angle direction without using a special corner steel sheet pile such as a T-shaped sheet pile, and completed the present invention.

Here, the gist of the present invention is as follows. (1) When performing joint bending in hot rolling of a preferably U-shaped steel sheet pile having an asymmetrical joint shape, the joint bending is finished using different hole-type rolls on one side each. Hot rolling method for steel sheet pile.

(2) The rolling method according to the above (1), characterized in that while the bending of one of the joints is being finished, the other joint is only constrained in a roll hole die and not bent. Hot rolling method for asymmetric steel sheet piles.

(3) The hot rolling method for asymmetric steel sheet pile according to the rolling method according to (1), wherein the bending of one of the joints is completed while the other joint is partially bent. .

(4) An inward joint of an asymmetric steel sheet pile or the like in which one has an inward joint and the other has an outward joint, and has a cross-sectional shape aligned in the same direction and can be connected linearly.
A corner steel sheet pile having a shape in which one of the outward joints is bent inward by 45 ° .

(5) The inner wall of the engaging edge of the inward joint is parallel to the driving normal of the asymmetric steel sheet pile, or the inner wall of the engaging edge of the outward joint and the driving of the asymmetric steel sheet pile are parallel. The corner steel sheet pile according to the above (4), wherein the normal line is perpendicular to the construction normal line.

(6) In a method of manufacturing an asymmetric, preferably U-shaped, corner steel sheet pile having one inward joint and the other an outward joint, asymmetrical joints are provided at both ends in a hot rolling step. A method of manufacturing a corner steel sheet pile, comprising a step of bending only one of an inward joint and an outward joint of the steel sheet pile inwardly by 45 ° after forming the steel sheet pile.

(7) In a method of manufacturing an asymmetric, preferably U-shaped, corner steel sheet pile having one inward joint and the other an outward joint, asymmetrical joints are provided at both ends in a hot rolling step. After forming the U-shaped steel sheet pile having, after cutting only one side of the inward joint or the outward joint of the steel sheet pile at the boundary between the joint and the arm, the joint is set at 45 °.
A method for manufacturing a corner steel sheet pile, comprising: disposing the joint inward, and then joining the joint and the arm by welding.

(8) The step of bending only one of the inward joint and the outward joint of the steel sheet pile inwardly by 45 ° is performed by a rolling roll, wherein the step of bending the corner steel sheet pile according to the above (6) is performed. Production method.

(9) The step of bending only one of the inward joint and the outward joint of the steel sheet pile inward by 45 ° using a roller guide.
A method for producing a corner steel sheet pile according to the above.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing an asymmetric steel sheet pile according to the present invention will now be described with reference to the accompanying drawings, and then a corner steel sheet pile and a method for manufacturing the same will be described. In the present embodiment, a U-shaped steel sheet pile will be described as an example of the steel sheet pile.

FIGS. 7 (a) to 7 (c) show an example of a roll hole die for rolling a U-shaped steel sheet pile having a left-right asymmetric shape according to the present invention. The figure shows the pre-joint-bending mold (K-3 ') and the joint-bending mold (K-2', K-1 ').

The hot rolling method according to the present invention will be described below with reference to FIG.

First, as shown in FIG. 7 (a), grooved rolling is performed in the same manner as in the conventional method, and after adjusting the joint thickness and joint height of the rolled material 26 with the grooved die K-3 ', concretely, Then, as shown in FIG. 7 (b), the left joint is bent by, for example, a die (K-2 '). At this time, the deformation of the rolled material 26 in a cross section perpendicular to the rolling direction is not symmetrical, and there is a left-right difference in the rolling posture before and after the roll is engaged. Unreasonable deformation near the dead center is suppressed, and the rolling posture, particularly the posture on the delivery side, is stabilized.

Therefore, a good joint shape is formed by bending on the left side, and the open shape (K-3 ') is maintained on the right side. Next, as shown in FIG. 7 (c), when the right joint is bent using the die (K-1 ′), the shape of the left roll die is the same as that of the die (K-2 ′). By doing so, similarly to the above-mentioned reason, the rolling posture is stabilized, and as a result, a good joint shape is obtained on both the left and right sides.

Here, "midway bending" which may be performed on the other joint while finishing the bending of one joint is as follows.
For example, in the case of FIG.
(Step b). This is because such an influence on the rolling posture is small.

Further, in the case of FIG. 7, as in the case of the die (K-2 ') in FIG. 7B, the bending should be performed so that the instability of the rolling posture falls within an allowable range. Say. That is, the left and right joint bending may be performed under the condition that the substantial bending is not performed simultaneously on the right and left.

Typical examples of the asymmetric steel sheet pile on which joint bending is performed by hot rolling according to the present invention include a U-shaped steel sheet pile, a Z-shaped steel sheet pile, and an I-shaped sheet pile whose joint portion is asymmetric.
Examples include tubular steel sheet piles, but there is no particular limitation as long as the asymmetrical portion is formed by bending at the finish forming stage by hot rolling.

Next, a corner steel sheet pile according to the present invention and a method of manufacturing the same will be described in detail. 8 and 9 show an example of a corner steel sheet pile 54 having an inward joint 50 and an outward joint 52 according to the present invention. FIG. 8 is a schematic sectional view of a corner steel sheet pile 54 in which an inward joint 50 is machined inward by 45 ° by welding, and FIG. 9 is a corner steel sheet pile in which an outward joint 52 is machined inward by 45 ° by welding. FIG. 54 is a schematic sectional view of a part 54. In each case, the weld 56 is shown in black.

As shown in FIG. 10, one of the corner steel sheet piles 54 according to the present invention has an inward joint 36 (upward claw) and the other has an outward joint 38 (downward claw). Based on an asymmetric U-shaped steel sheet pile 30 whose cross-sections can be aligned in the same direction and can be connected linearly, the joints 36, 38 of this steel sheet pile 30
Arm 37 extending in the horizontal direction of the steel sheet pile.
It has a shape that is bent inward (downward) by 45 ° at the boundary portion 39 of the joint. In the drawing, the boundary portion 39 is shown as a cut portion, which corresponds to a welded portion when manufacturing by a welding method.

FIG. 11 (a) shows a corner steel sheet pile according to the present invention, that is, a type in which an inward joint is bent inward and a type in which an outward joint is bent inward. Shows the situation of fitting and driving. FIG. 11B is a partially enlarged view of FIG.

As shown in FIG. 8, when the inward joint is bent inward by 45 °, the inner wall of the engaging edge of the inward joint and the driving normal of the steel sheet pile (the one-dot chain line in the figure) are formed. Be parallel.

Also, as shown in FIG.
By bending inward by 45 °, the inner wall of the engaging edge of the outward joint and the driving normal of the steel sheet pile (the dashed line in the figure) become perpendicular.

As shown in FIGS. 11 (a) and 11 (b), when the above-mentioned two types of corner steel sheet piles are fitted with each other by bending joints, the driving normal of each steel sheet pile is perpendicular. And can be used as a corner of a steel sheet pile wall.

In the above description, the case where the inward or outward joint is bent inward by welding has been described.
An asymmetric U-shaped sheet pile having one outward-facing joint and the other inward joint as shown in Fig. 10 is manufactured by hot rolling, and then the boundary between one of the joints and the arm (Fig. Ten
(Dotted line portion), the joint is disposed inward, and the joint and the cut portion of the arm are joined by welding. For this reason, there is almost no wasted part in the material unlike the T-shaped corner steel sheet pile manufactured by conventional welding,
Production with high yield is possible.

The corner steel sheet pile of the present invention may be formed by bending either one of the conventional U-shaped steel sheet piles having an asymmetrical joint portion inwardly, and therefore hot rolling or hot or warm forming. Can also be manufactured.

FIG. 12 illustrates a method of manufacturing a corner steel sheet pile according to the present invention, in which an outward joint is bent inward by hot rolling.
The asymmetric U-shaped steel sheet pile 30 as shown in FIG. 10, which is formed into a hole shape and is hot-rolled by a hole shape roll of a rolling mill located on the more upstream side as a material to be rolled, as shown in FIG. The upper and lower surfaces of the steel sheet pile 30 are restrained, and at the same time, the outward joint (upward claw) 38 is pressed from above to form the sheet pile 30 in one pass. The grooved roll for molding may be engraved on the same roll as the grooved roll used in the hot rolling on the upstream side, or may be arranged on another roll.

FIG. 13 shows an example of a method for manufacturing a corner steel sheet pile according to the present invention, in which an inward joint is bent inward by hot or warm forming. A roller guide 64 is disposed so as to sandwich the workpiece, and the asymmetric U-shaped sheet pile 30 as shown in FIG. 10 which is hot-rolled as a raw material by a grooved roll of a rolling mill located on the more upstream side as shown in FIG. The upper and lower rollers 66, 68 are used to constrain the upper and lower surfaces of the steel sheet pile 30 and the left end roller 70 is used to constrain the side surface of the steel sheet pile 30. ) 36 is formed in one pass by pressing it from above. Roller guide 64 for such forming
Is preferably provided immediately behind the finishing mill from the viewpoint of facilitating bending.

As for the method of manufacturing the asymmetric U-shaped sheet pile 30 shown in FIG. 10 as a workpiece for manufacturing the corner steel sheet pile of the present invention, the rolling method described with reference to FIG. 7 can be used. It is.

Further, when the corner steel sheet pile of the present invention is driven, it can be continuously worked in the same direction as the ordinary asymmetric U-shaped sheet pile shown in FIG. When the sheet pile is chucked, the web or the arm can be chucked, and there is no problem that ordinary chucking cannot be performed unlike the conventional T-shaped or W-shaped corner steel sheet pile.

FIGS. 14 (a) and 14 (b) illustrate a state where the corner steel sheet pile 54 of the present invention is piled. FIG. 14 (a) shows an inward joint and FIG. 14 (b) shows a corner steel sheet pile in which an outward joint is bent inward. As you can see from this figure,
There is no interference between the joints at the time of piling, so that no matter how many pilings, the piling posture is unstable and there is no problem.

The bending angle of the steel sheet pile wall (the angle at which the steel sheet pile driving normal intersects) is usually the most right angle, but may be other than right angle depending on the construction site. But,
According to the method of manufacturing a corner steel sheet pile of the present invention, by changing the angle at which one of the joints is bent by a finish mill or a roller guide disposed immediately after the finish mill, it is also used at a corner other than a right angle. It is also possible to produce a possible corner steel sheet pile.

[0057]

【Example】

(Example 1) In order to confirm the effect of the present invention, a simulation by a two-dimensional finite element method (2D-FEM) and a test rolling using an actual rolling mill were performed. FIG. 15 shows the 2D-FE
8 shows the behavior of a rolled material in a hole type K-2 ′ (see FIG. 7) by M.

According to the results shown in FIGS. 15 (a) to 15 (f), in the progress of the rolling in the die K-2 ', the joint portion on the side where bending is not performed (the right-hand side as viewed in FIG. 15) is changed. Flange part 3
2. It can be seen that the body including the arm 37 is restrained in the roll bite and maintains the original shape.

This is quantitatively summarized as shown in Table 1 below when compared with the case where the asymmetric joints on both sides are simultaneously rolled (Comparative Example). In the table, “Joint height”, “Joint thickness”, and “Joint opening” are shown in FIG.
As described in

From this, it can be seen that it is particularly effective to separately form the asymmetric joint according to the present invention in terms of obtaining a good joint shape over the entire length of the steel slab. Further, the present invention is effective also in respect of the seizure resistance of the roll in the joint portion.

[0061]

[Table 1]

Further, as a result of actually trying the rolling using a rolling mill by the hot rolling method according to the present invention, it is possible to obtain a product having a joint shape having good joints on both the left and right with a good yield as shown in FIG. Was.

Example 2 A corner steel sheet pile of the present invention was manufactured by hot rolling as described with reference to FIG.
And a common asymmetric U-shaped steel sheet pile shown in Fig. 1 to form a wall of a basement for residential use.

First, 250 mm heated to 1280 ° C. in a heating furnace
A continuous cast slab having a thickness of 700 mm and a width of 700 mm was hot-rolled by a triple mill consisting of a horizontal horizontal roll, a middle mill, and a finishing mill. Four, three, and three hole patterns were arranged on the rolls of each mill, respectively. Through reversal rolling in these three mills, the material to be rolled is finished to the shape of a conventional asymmetric U-shaped sheet pile shown in FIG. Then, using a roller guide arranged behind the finishing mill, the outward joint is turned inward by 45 °.
Two types of steel sheet piles were produced, a bent-type corner steel sheet pile and an inward-jointed corner steel sheet pile formed by bending inward at 45 °. Furthermore, the sheet guides rolled by the finishing mill were manufactured at the same chance by increasing the opening degree of the roller guide.

Among the corner steel sheet piles manufactured by the method of the present invention, a type in which an outward joint is bent inward.
4 types (A type), 4 types (B type) with inwardly bent joints bent inward, and a normal asymmetric U
A pit retaining wall used as a basement for houses was constructed by assembling 30 section steel sheet piles. Fig. 17
Shows the construction results. With 6 pieces in the vertical direction (2 of them are corner steel sheet piles) and 13 in the horizontal direction (2 of them are corner steel sheet piles), all could be successfully placed without any construction trouble.

[0066]

According to the method of the present invention, in the hot rolling of a U-shaped sheet pile having an asymmetrical joint shape, the joint shape can be improved without causing unstable rolling posture and incomplete joint forming. Can be obtained.

In addition, the corner steel sheet pile of the present invention can be continuously driven in the same direction without causing a problem of chucking of a pile driver at the time of driving and a problem at the time of transport and storage of the steel sheet pile. Since it is a simple steel sheet pile, it is effective for labor saving and reduction of construction cost by improving construction efficiency. Regarding the manufacturing method, if a part of a steel sheet pile is cut and welded using the same material, it can be converted to a corner steel sheet pile. The invention is economical and extremely industrially useful in that it can be manufactured only by partially modifying or adding a roller guide.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an asymmetric U-shaped sheet pile to which the present invention is directed.

2 (a) is an explanatory view of an asymmetric steel sheet pile according to the present invention, and FIG. 2 (b) is an explanatory view of an example of use of a conventional symmetric steel sheet pile.

FIG. 3 (a) is a diagram showing an example of a conventional corner steel sheet pile, and FIG. 3 (b) is a schematic explanatory diagram of an example of its use.

FIG. 4 (a) is a view showing another example of a conventional corner steel sheet pile, and FIG. 4 (b) is a schematic explanatory view of an example of its use.

FIG. 5 (a) is a schematic diagram of a pre-finishing die (K-2) and FIG. 5 (b) is a schematic of a finishing die (K-1) of a general U-shaped steel sheet roll rolling die. FIG.

FIG. 6 is a schematic explanatory view of a joint bending process in a die (K-1).

FIG. 7 (a) is a diagram illustrating a hole shape before joint bending (K-3 ′) in a roll hole type for rolling a U-shaped sheet pile having an asymmetric shape.
FIGS. 7 (b) and (c) show the joint bending molds (K-2 ', K-2).
-1 ′) is a schematic explanatory diagram.

FIG. 8 is a schematic sectional view showing an example of a corner steel sheet pile of the present invention.

FIG. 9 is a schematic sectional view showing an example of another corner steel sheet pile of the present invention.

FIG. 10 is a schematic sectional view of an asymmetric U-shaped sheet pile to which the present invention is directed.

11 (a) is an explanatory view showing an example of placing a corner steel sheet pile of the present invention, and FIG. 11 (b) is a partially enlarged view thereof.

FIG. 12 is a diagram illustrating an example of a method for manufacturing a corner steel sheet pile of the present invention.

FIG. 13 is a view showing an example of another method for manufacturing a corner steel sheet pile of the present invention.

14A and 14B are explanatory views of a piled state of a corner steel sheet pile of the present invention. FIG. 14A shows a case of a corner steel sheet pile in which an inward joint is bent inward, and FIG. This is the case of a bent corner steel sheet pile.

15 (a) to 15 (f) are schematic explanatory views showing the results of a simulation of the behavior of a rolled material in a hole shape (K-2 ′) by a two-dimensional finite element method.

FIG. 16 is an explanatory diagram of each part of the joint.

FIG. 17 is a view showing a construction example of a corner steel sheet pile of the present invention.

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Claims (9)

(57) [Claims] 1. A hot rolled steel sheet pile having an asymmetrical joint shape, wherein the joint bending is performed using different hole-type rolls on one side, respectively, when the joint bend forming is performed. Hot rolling method. 2. The asymmetric rolling method according to claim 1, wherein the bending of one of the joints is completed while the other is restrained only in the roll die while the bending of one of the joints is being completed. Hot rolling method for steel sheet pile. 3. The hot rolling method for an asymmetric steel sheet pile according to claim 1, wherein the bending of one of the joints is completed while the other joint is partially bent. 4. An inward or outward joint of an asymmetric steel sheet pile, one of which has an inward joint and the other has an outward joint, and has a cross-sectional shape aligned in the same direction and can be connected linearly.
A corner steel sheet pile having a shape in which one of the directional joints is bent inward by 45 ° . 5. An inner wall of an engaging edge of the inward joint and a driving normal of the asymmetric steel sheet pile are parallel to each other, or an inner wall of an engaging edge of the outward joint and a driving method of the asymmetric steel sheet pile are set. The corner steel sheet pile according to claim 4, wherein the line is perpendicular. 6. A method for manufacturing an asymmetric corner steel sheet pile having one inward joint and the other having an outward joint, after forming a steel sheet pile having asymmetric joints at both ends in a hot rolling step. And bending only one of the inward joint and the outward joint of the steel sheet pile inward by 45 ° . 7. A method of manufacturing an asymmetric corner steel sheet pile having one inward joint and the other having an outward joint, after forming a sheet pile having asymmetric joints at both ends in a hot rolling step. After cutting only one side of the inward joint or outward joint of the steel sheet pile at the boundary between the joint and the arm, the joint is disposed inward at 45 ° , and then the joint and the joint A method for manufacturing a corner steel sheet pile, comprising joining arms by welding. 8. The method for manufacturing a corner steel sheet pile according to claim 6, wherein the step of bending only one of the inward joint and the outward joint of the steel sheet pile inward by 45 ° is performed by a rolling roll. . 9. The method for manufacturing a corner steel sheet pile according to claim 6, wherein the step of bending only one of the inward joint and the outward joint of the steel sheet pile inward by 45 ° is performed by a roller guide. .