JPH11140864A - Wall type steel sheet pile, its manufacture, and method for joining the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wall type steel sheet pile easily welded to H-steel without causing thermal deformation during welding; a method for manufacturing the same; and a method for joining the same. SOLUTION: A wall type steel sheet pile 8 has joint parts 2, 2A of rotation symmetry at both ends of a web part 1, with the front surface of one of the joint parts and the surface of the web part 1 forming the same plane; the wall type steel sheet pile 8 also has a recess part 3 in the back of the web part 1, with both side walls 4, 4A of the recess part 3 being perpendicular and having bevels 6, 6A at their respective ends, and with ribs 7, 7A provided in plural parts of the bottom surface of the recess part 3. The steel sheet pile 8 can be manufactured efficiently by subjecting a heated steel piece to a combination of rolling processes including rough rolling, universal rolling, and edger rolling and then to finish rolling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall-type steel sheet pile mainly used for civil engineering work, a method of manufacturing the same, and a method of joining the same.

[0002]

2. Description of the Related Art In general, there are U, Z, and straight type (= wall type) steel sheet piles, and when constructing a continuous wall in civil engineering work, these steel sheet piles are joined and driven. Further, as a type suitable for a continuous wall having a high proof stress, a type obtained by combining these and a type obtained by welding an H-shaped steel to a wall type steel sheet pile are known.

[0003] A continuous wall constructed by driving a U-shaped or Z-shaped steel sheet pile has irregularities on the wall surface as shown in the example of the U-shaped in FIG. Causes stagnation. Further, when used on the outer wall of a building, there is a problem that the aesthetic appearance is impaired and a dead space occurs on the land. In addition, many of these steel sheet piles have symmetrical joints, and it was necessary to change the direction of the steel sheet piles one by one when the construction was extended.

On the other hand, continuous walls constructed by casting wall-type steel sheet piles do not have the above-mentioned drawbacks, and in recent years there has been an increasing demand for their use, and there are several techniques relating to the shape and manufacturing method of straight-type steel sheet piles. Proposed. For example, JP-A-8-
No. 100422 discloses that in a straight steel sheet pile having an asymmetric Larzen joint at both ends of a web portion, one of the joint portions extends from a flange portion bent and formed at one end of the web portion on the back side of the casting wall. A key-shaped claw is provided at the current position, and the other joint portion engaged with the key-shaped claw is spaced from the key-shaped claw formed flush with the casting surface at the other end of the web portion. A retaining projection is provided on the rear side of the casting wall to prevent the nail from coming off, and a welding ridge for connection is formed substantially at the center of the rear side of the casting of the web portion. H
A straight steel sheet pile for a profiled sheet pile is disclosed.

[0005] For example, Japanese Patent Application Laid-Open No. 62-133209 discloses that a joint portion (= joint portion) is formed at both ends of a web as a member for forming a composite steel sheet pile by welding to one end of an H-section steel. A straight steel sheet pile is disclosed.

[0006]

Problems to be Solved by the Invention
The straight-type steel sheet pile disclosed in Japanese Patent Application Publication No. H11-28410 has a welding ridge for connection in the approximate center of the driving rear face of the web portion in order to use as a so-called H-shaped steel sheet pile in which the driving back faces are welded with a connecting plate, Although the wall surface after the construction is devised so as to be a perfect plane, when the connection plate is welded to the welding ridge for connection, there is a disadvantage that it takes time to perform welding setup such as positioning and fixing of the connection plate.

[0007] The straight steel sheet pile disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 62-133209 is not only a straight type, but the joint portion protrudes in the web thickness direction so that the wall surface after the construction is not flat, Since both ends of one side flange of the H-section steel are directly welded to the sheet pile web surface, there are disadvantages in that thermal deformation is large and positioning is not easy. The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has a wall-type steel sheet pile which can be easily welded to an H-section steel and does not undergo thermal deformation during welding.
An object of the present invention is to provide a manufacturing method and a joining method thereof.

[0008]

SUMMARY OF THE INVENTION The present invention has a rotationally symmetrical joint at both ends of a web portion, and the upper surface of one joint portion and the surface of the web portion are flush with each other, and the back side of the web portion surface. A concave portion on both sides of the concave portion, the bottom surface side is vertical and has a groove at an end portion of the both side walls, and has a ridge at a plurality of locations on the bottom surface of the concave portion. It is a wall type steel sheet pile.

Further, the present invention provides a step of heating a steel slab by a heating furnace (heating step) and a step of forming a web portion having a substantially flat surface at a central portion of the steel slab and a concave portion on a back surface side by a rough rolling mill. Forming a substantially rotationally symmetrical claw portion at both ends of the web portion (rough rolling process), adjusting the thickness of the web portion by a universal rolling mill and an edger rolling machine, Making the same plane, adjusting the thickness and length of both claw portions to provide ridges at a plurality of locations on the bottom surface of the concave portion (UE rolling process), and adjusting the thickness of the web portion by a finish rolling mill A step of shaping the ridge, vertically shaping both side walls of the recess, giving a groove to an end of the both side walls, and bending and forming the claw portion rotationally symmetrically to form a joint portion (finish rolling step). A method of manufacturing a wall-type steel sheet pile, comprising: .

[0010] The present invention also relates to a method of splicing a wall-type steel sheet pile according to claim 1 in a longitudinal direction thereof, wherein the H-shaped steel is welded over a concave portion of the wall-type steel sheet pile on both sides of the seam. This is a method of joining wall-type steel sheet piles.

[0011]

FIG. 1 is a sectional view showing an example of a wall-type steel sheet pile (sheet pile) 8 according to the present invention. Sheet pile 8 as shown
Has rotationally symmetrical joints 2 and 2A at both ends of the web portion 1, and the upper surface of one joint portion 2 (the surface on the outer bending side of the hook-like joint).
And the surface of the web part 1 are flush with each other.
Has a concave portion 3 on the back side thereof, and both side walls 4 and 4A of the concave portion 3 are vertical and have a groove 6 and 6A at an end portion. 7A. FIG.
9 is an H-beam.

When constructing the continuous wall, the joint 2A of one sheet pile 8 is engaged with the joint 2A of the other sheet pile 8 as shown in the figure. Because of the symmetrical relationship, it is not necessary to change the direction of the sheet pile 8 and construction can be performed in the same posture. In addition, since the upper surface of one joint part 2 and the surface of the web part 1 are on the same plane, the surface of the continuous wall is almost completely flat as shown in the figure, and when applied to a water channel, water stagnation occurs. Does not occur, and when applied to a building, there is no loss of aesthetic appearance or dead space on the land.

Further, a concave portion 3 is provided on the back surface side of the web portion 1, and both side walls 4, 4A of the concave portion 3 are vertical and have a groove 6, 6A on the upper side. As shown in the figure, when the sheet pile 8 is welded to the H-section steel 9 to increase the yield strength, the projections 7 and 7A are connected to the H-section steel 10 as shown in FIG. The flanges of the H-shaped steel 9 are positioned smoothly even when the flanges of the H-shaped steel 9 are slightly deformed because the two side walls 4 and 4A guide the two ends of the flange of the H-shaped steel 9 at two places. And at the same time the posture after positioning is stabilized.

Further, the groove 6 is already formed at the end of the side wall 4, 4A.
Since 6A is provided, it is not necessary to perform groove processing on the product after rolling, and the welding setup work load is greatly reduced. Further, since the groove 6, 6A is located at a position away from the bottom surface 5 of the web portion 1, the web portion 1 is not deformed by the welding heat or the material does not change. In addition, from the viewpoint of easy positioning and groove alignment, the depth of the concave portion 3 (side walls 4, 4)
The height of A is about 0.5 to 1.0 times the nominal flange thickness of the H-section steel 9, and the width of the recess 3 (the distance between the side walls 4 and 4A) is about 1 to 5 mm than the nominal flange width of the H-section steel 9. It is desirable that the protrusions 7 and 7A are located near the side walls 4 and 4A, respectively, and the height thereof is about 0.2 to 1.0 mm.

Further, if a structure having three ridges 7 is provided as shown in FIG. 2, two H-section steels 9, 9 can be welded. FIGS. 3A and 3B show a preferred assembling mode when a plurality of wall-type steel sheet piles of the present invention are joined together.
(B) is a side view. In FIG. 3, reference numeral 10 denotes sheet pile 8 and H
This is a composite steel sheet pile formed by welding and joining a shape steel 9. As shown in the figure, the composite steel sheet pile 10 is preferably formed by welding and joining the sheet pile 8 and the H-section steel 9 so as to protrude from each other in the longitudinal direction.

Thus, when two or more composite steel sheet piles 10 are spliced and driven, the concave portions 3 of the composite steel sheet pile 10 previously driven are formed.
However, this works as a groove for guiding the flange of the composite steel sheet pile 10 to be cast later, so that field welding for joining is facilitated and deformation is less likely to occur.

[0017]

Next, with reference to FIG. 4 and FIG. 5, the procedure of the method of the present invention for manufacturing a wall-type steel sheet pile (the method of the present invention) will be described. FIG. 4 is a layout diagram showing an example of a section steel rolling facility suitable for carrying out the method of the present invention. In FIG. 4, 11 is a heating furnace, 12 is a rough rolling mill, 13 is a universal rolling mill, 14 is an edger rolling mill, and 15 is a finishing rolling mill.

FIG. 5 shows a method of the present invention in which (a) is a heating step, (b) and (c) are rough rolling steps, (d) and (e) are UE rolling steps, and (f) is finish rolling. It is sectional drawing of the material which shows the Example of a process. In FIG. 5, 16 is a billet, 17, 17
A is a claw portion, 18 and 19 are upper coarse holes, 18A and 19A are lower coarse holes, 20 and 20A are upper and lower horizontal rolls, 21 and 21A are right and left vertical rolls, and 22 and 22A are upper and lower edges. Jar roll, 23, 23
A is upper and lower finishing rolls. The same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the heating step, the steel slab 16 having a rectangular cross section is heated to 1250 to 1280 ° C. by the heating furnace 11. It is to be noted that soaking may be performed instead of heating. In the rough rolling step, a web portion 1 having a substantially flat surface and a concave portion 3 on the back surface side is formed at the center of the steel slab 16 heated by the rough rolling machine 12 and the web portion 1 is formed.
Claw portions 17, 17A which are substantially rotationally symmetric with each other are formed at both ends.

In this step, a pair of upper and lower coarse-hole rolls having a predetermined shape are arranged in the rough rolling mill 12, and the upper and lower coarse-hole molds 18, 18A and 19, 19A formed by the rough-hole rolls are used to make billets. It is performed without problems by passing 16 in sequence. In the UE rolling step, the thickness of the web portion 1 is adjusted by the universal rolling mill 13 and the edger rolling mill 14 so that the surface thereof and the surface of the one claw portion 17 are flush with each other, and the thickness and length of both claw portions 17 and 17A are adjusted. The protrusions 7, 7 are provided at two places on the bottom surface 5 of the concave portion 3.
A is given.

In this step, a pair of upper and lower horizontal rolls 20 and 20A having a predetermined shape and a pair of right and left vertical rolls 21 and 21A having a predetermined shape are arranged on the universal rolling mill 13 and the edger rolling mill 14 has a predetermined shape. This can be performed without any problem by arranging a pair of upper and lower edger rolls 22 and 22A, combining the universal rolling mill 13 and the edger rolling mill 14, and successively reducing the distance between the paired rolls and rolling a plurality of times.

The vertical rolls 21, 21 of the universal rolling mill 13
By pressing down from both sides by A, the toe portions of the claw portions 17 and 17A can be easily formed thin and elongated. In order to regulate the height (length) of the portions that cannot be reduced by the universal rolling mill 13, for example, the claw portions 17 and 17A, the shape is adjusted by the edger rolls 22 and 22A of the edger rolling mill 14. In the finish rolling step, the universal rolling mill 13 and the edger rolling mill 14
Using a rolled material that has been subjected to a plurality of passes of rolling and adjusted to a shape before finishing as a material, the thickness of the web portion 1 is adjusted by a finishing rolling machine 15 to shape the ridges 7 and 7A, and the concave portion 3 is formed. The two side walls 4 and 4A are vertically formed, and grooves 6 and 6A are provided at the ends of the both side walls and the claw portions 17 and 17A are formed.
Are bent and formed so as to be rotationally symmetric to each other.
2A.

This step is carried out without any problem by disposing a pair of upper and lower finishing rolls 23, 23A having a predetermined shape in the finishing mill 15 and setting the interval between the upper and lower rolls to a predetermined value and passing the rolled material through. Is done. When manufacturing a wall-type steel sheet pile having a structure in which three ridges are provided as shown in FIG. 2, in the steps of FIGS. 5 (d), (e) and (f), the hole shape of the lower roll is obtained. Can be changed.

Thus, according to the method of the present invention, the wall-type steel sheet pile of the present invention can be manufactured efficiently.

[0025]

As described above, according to the present invention, it is possible to provide a wall-type steel sheet pile that can be easily welded to an H-section steel and that does not undergo thermal deformation during welding. It has an excellent effect that it can be manufactured efficiently.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a wall-type steel sheet pile of the present invention.

FIG. 2 is a sectional view showing another example of the wall-type steel sheet pile of the present invention.

3 (a) is a front view and FIG. 3 (b) is a side view showing a preferred assembling mode when a plurality of wall-type steel sheet piles of the present invention are joined.

FIG. 4 is a layout view showing an example of a section steel rolling facility suitable for carrying out the method of the present invention.

FIG. 5 (a) of the method of the present invention is a heating step, (b),
(C) is a rough rolling step, (d) and (e) are UE rolling steps,
(F) is sectional drawing which shows the Example of a finish rolling process.

FIG. 6 is a cross-sectional view illustrating a continuous wall made of a U-shaped steel sheet pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Web part 2, 2A joint part 3 Concave part 4, 4A Side wall 5 Bottom surface 6, 6A Groove 7, 7A Ridge 8 Wall type steel sheet pile (sheet pile) 9 H-section steel 10 Composite steel sheet pile 11 Heating furnace 12 Rough rolling mill 13 Universal Rolling mill 14 Edger rolling mill 15 Finish rolling mill 16 Billet 17, 17A Coarse portion 18, 19 Coarse-hole type 18A, 19A Lower-coarse type 20, 20A Upper and lower horizontal rolls 21, 21A Left and right vertical rolls 22, 22A Upper and lower edger rolls 23, 23A Upper and lower finish rolls

Claims (3)

[Claims] 1. A joint having rotationally symmetrical joints at both ends of a web portion, the upper surface of one joint portion and the surface of the web portion are flush with each other, and a concave portion is formed on the back side of the web portion. A wall type steel sheet pile characterized in that both side walls are vertical and have a groove at an end portion of the both side walls, and have ridges at a plurality of positions on a bottom surface of the concave portion. 2. A step of heating a steel slab by a heating furnace, and forming a web portion having a substantially flat surface at the center portion of the steel slab and having a concave portion on the back side thereof by a rough rolling machine, and forming a web portion at both ends of the web portion. Forming a substantially rotationally symmetrical claw portion, adjusting the thickness of the web portion with a universal rolling mill and an edger rolling mill, making the surface thereof and one claw portion upper surface coplanar, and the thickness and length of both claw portions. Adjusting the thickness of the web portion by adjusting the thickness of the web portion with a finishing mill, adjusting the thickness of the web portion with a finishing mill, shaping the ridge, and vertically shaping both side walls of the recess. Providing a groove at the ends of both side walls and bending the claw portion rotationally symmetrically to form a joint portion. 3. A method for joining a wall-type steel sheet pile according to claim 1 in a longitudinal direction thereof, wherein the H-shaped steel is welded over a concave portion of the wall-type steel sheet pile on both sides of a joining portion. A method of joining steel sheet piles.