JPH08100422A - Straight type steel sheet pile and rolling method thereof - Google Patents

Abstract

(57) [Summary] [Purpose] While the surface of the cast wall has a perfect flat surface,
To establish a straight type steel sheet pile capable of easily forming and rolling an asymmetrical Larsen type joint and its advantageous manufacturing technology. [Structure] In the intermediate rolling process and finish rolling process in which the protrusion is roughly formed on the rear surface side of the casting wall with the edging rough rolling hole die, the height is not satisfied in the intermediate rolling process and finish rolling process. By increasing the inclination of the part hole shape, the rolled material can be easily separated from the roll hole shape, and the height can be satisfied, but by filling the thickness direction of the protruding hole shape, the rolled material can be easily separated from the roll hole shape. By repeatedly performing the roll-rolling of the above-mentioned passes, one joint part is provided with an engagement interval along the key-shaped pawl formed directly on one end of the web part, and a retaining ridge for preventing the disengagement of the pawl. A straight steel sheet pile having an asymmetrical Larsen type joint portion formed by projecting and having a welding ridge for connection formed substantially at the center on the rear surface side of the web portion for casting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straight-lined steel sheet pile suitable for driving a continuous wall having few irregularities and a rolling method therefor, and more particularly to a straight-lined steel sheet pile having an asymmetric Larsen type joint portion. It proposes a shape and its advantageous rolling technique.

[0002]

2. Description of the Related Art Generally, U-shaped steel sheet piles are often used as a steel sheet pile for constructing a continuous wall. However, this type of sheet pile has irregularities on the wall surface, and stagnation of the flow of water and accumulation of earth and sand in the depressions. In addition to the drawback of easy occurrence, recently, from the viewpoint of impairing the landscape (because aesthetic paintings cannot be drawn), there is a demand for a further flattened wall surface.

Recently, in order to meet such needs,
Straight type steel sheet piles and H type steel sheet piles have been developed. However, these need to form a complicated joint structure at both ends of the web portion as compared with the U-shaped steel sheet pile, so that they are difficult to manufacture and the shape that can be manufactured is also limited.

For example, Japanese Unexamined Patent Publication No. 51-27850, Japanese Unexamined Patent Publication No. 2-200302, and Unexamined Japanese Utility Model Publication No. 6-30220 disclose straight type steel sheet piles having an asymmetric joint portion, but these are all However, this is a male-female fitting type joint, and has a problem that the surface side of the casting wall cannot be made into a completely flat surface.

[0005]

That is, in most of the above-mentioned prior arts, there is a problem in that unevenness is inevitably generated on the surface side of the casting wall because at least one of the joint portions is large, and There was a common problem that the technology was difficult and the manufacturing cost was high.

An object of the present invention is to solve the problems of the above-mentioned prior art. In particular, the surface of the casting wall has a perfect flat shape, and it is easy to form and roll an asymmetric Larsen joint. It is to establish a straight type steel sheet pile that can be carried out and its advantageous manufacturing technology.

[0007]

As a means for solving the above-mentioned problems, the inventor of the present invention uses a straight steel sheet pile formed with a Larzen joint portion as a base to completely flatten the surface of the driving wall. In addition, we decided to devise the joint structure by focusing on the asymmetric Larsen type joint. That is, one of the joints has a structure in which the key-shaped pawl is placed through the flange, and the height of the key-shaped pawl is lowered to the minimum, and the other joint to be engaged with this is provided in the vicinity of the key-shaped pawl instead of the flange. By projecting the retaining ridges at the engagement intervals, a guide function is provided at the time of driving, and the disengagement of the claws is made difficult.

On the other hand, a feature of the manufacturing method of the present invention resides in the above-mentioned rolling method of the ridge, which is a rough rolling hole die capable of edging to roughly form the protrusion and then shape the retaining ridge. When rolling, it has a large inclination and does not satisfy the height (depth) so that the roll hole type and the rolled material are separated from each other well, and the height is satisfied and there is a margin in the thickness direction. The point is that the rolling and the die rolling in which the separation between the die and the rolled material is improved are alternately performed.

That is, the gist of the present invention is as follows. (1) In a straight type steel sheet pile having asymmetric Larsen type joint portions provided at both ends of the web portion, one of the joint portions is located at an extending position of a flange portion formed by bending on the rear surface side of the casting wall at one end of the web portion. The other joint part which is provided with a key-shaped pawl and which engages with the key-shaped pawl is formed into a flush wall with the batting surface at the other end of the web portion, and the mounting wall is provided with an engaging interval from the key-shaped pawl. A straight line characterized by being formed by projecting a retaining ridge for preventing disengagement of the claws on the back side, and forming a welding ridge for connection at substantially the center on the rear side of the driving of the web portion. Type steel sheet pile.

(2) The web portion has a Larsen type joint portion in which asymmetrical key-shaped claws are formed at both ends, and the web portion flattens the surface side of the casting wall while the back side thereof is In addition to the flanges and ridges along the key claws, in the rolling method of the straight type steel sheet pile forming the welding ridges, first, the protrusions are roughly formed on the rear surface side of the casting wall with the rough-edged hole die capable of edging. After that, in the intermediate rolling process and the finish rolling process for shaping the protrusion, a pass that makes it easier for the rolled material to separate from the roll hole mold by increasing the inclination of the protrusion hole mold without satisfying the height, and The straight line is characterized in that the rolling is performed by alternately repeating a pass that makes it easier for the rolled material to separate from the roll die by not satisfying the thickness direction of the projection die while satisfying This is a method of rolling a shaped steel sheet pile.

[0011]

According to the present invention, the joints are arranged asymmetrically on the left and right sides of the Larzen U-shaped steel sheet pile, and one of the joints is provided with a retaining ridge instead of the flange, thereby providing a guide function and a claw disengagement prevention function. It proposes a straight type steel sheet pile that has the above-mentioned features and the surface of the casting wall is completely flat.

In the present invention, as a method of rolling (forming) the flange portion and the retaining ridge portion in such a straight type steel sheet pile, in the present invention, the height of the ridge is obtained (satisfied) with a limited hole shape. ), It was noted that it is advantageous to carry out in the initial rough rolling stage where a large reduction amount can be obtained. That is, in this rough rolling stage, edging of the biting parts on both sides is performed until the height of the protrusion is satisfied, and thickness rolling for repeating the thickness reduction to satisfy the height of the protrusion is performed. I chose

Next, when the roughly formed retaining ridge is shaped, the protrusion of the rolled material is tightly packed in the groove of the roll, so that it becomes difficult to separate the rolled material from the roll. . On the other hand, since it is also necessary to shape the thickness and the height to a certain ratio, in the present invention, in the intermediate rolling step and the finish rolling step, the role of controlling the height and the path of regulating the thickness are important. In consideration of maintaining a space in the roll hole die for both passes, it was devised to prevent the adverse effect that the rolled material is wound around the roll without separating from the groove of the roll hole die due to the wedge effect.

Although it is possible to use the straight type steel sheet pile according to the present invention alone, it is possible to use the conventional U-shaped steel sheet pile and the H type steel sheet pile.
The section modulus is smaller than that of shaped steel sheet pile. Of course, it is easy to increase the cross-section coefficient by welding, but the strength is reduced due to insufficient penetration of the base material during welding. Therefore, in the steel sheet pile of the present invention, the projection is provided in advance at the welding place on the back surface of the casting wall to facilitate the penetration of the base material during welding. If these welding projections are faced and joined by a plate, an H-shaped steel sheet pile can be easily formed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a horizontal cross-sectional view of a straight type steel sheet pile 1 according to the present invention when it is cast on a connecting wall. As is clear from the drawing, although the joint portion J has an asymmetrical shape, the heights A of the left and right claw portions 2 and 3 are the same, so a guide frame (not shown) used during the placing work. It is easy to follow the relationship with each other, and the mutual engagement becomes smooth, which is advantageous for completely flattening the surface side of the casting wall.

FIG. 2 shows a roll hole type row when rolling the steel sheet pile 1 shown in FIG. 1 in the rough rolling steps (a), (b),
(c), intermediate rolling steps (d), (e), (f), (g), and finishing rolling steps (h), (i), (j) in this order, and the asymmetric Larsen type joint is It is what is rolled and shaped. The rolling process will be described in more detail below.

In the method of the present invention, in the initial hole type of the rough rolling mill 2 shown in step (a), when the rolled material 10 is turned by 90 ° and the biting portions E and E ′ are edging-rolled, the rolled material 10 is a manipulator. The left and right hole-shaped depths B and B'are set to substantially the same value so that they can be restrained by guides such as. Also, the height of the initial cross section: H
Is 1.5 to 2.0 times the value of B for forming the protrusion, and the thickness is reduced by 2 to 3 times, and the edging to suppress the protrusion is repeated 2 to 3 times. After that, hole type
Rolling in (b) and (c) and rough rolling are performed.

Then, the hole rolling of steps (a) to (g) is rolled by the intermediate rolling mill 3 in one or two passes, and finally, in the finish rolling mill 4, steps (h) and (i) are rolled. 1 for each of the strip rollings in (j)
Roll in a pass.

From the intermediate rolling (d) to the finish rolling (j), the reduction for forming the retaining ridges 5 is performed by the steps
In each of the groove rolling of (c), (e), (g), and (i), the inclination θ on the inner side of the ridge is set large to perform the rolling in the thickness direction of the ridge, but the depth of the groove is: e Is an unsatisfied part: deepened so that Δe remains.
This is effective in preventing the phenomenon that the protrusions are packed in the roll groove with a strong force, the place to go is lost, and the protrusion is stuck to the roll and cannot be separated.

Further, in the hole rolling of (d), (f), (h), and (j), although rolling in the height direction f is performed, an unsatisfied portion indicated by Δg is formed in the thickness direction, It is done so as to prevent the rolled material from being packed in the roll holes.

In this way, one of the joint portions is formed by providing a key-shaped pawl at one end of the web portion at the extending position of the flange portion bent and formed on the rear surface of the casting wall. The other mating part to be mated is formed by projecting a retaining ridge for preventing disengagement of the claw from the key-shaped claw formed flush with the end of the web part on the rear surface side of the casting wall at an engagement interval. In addition, a linear steel sheet pile having a connecting welding ridge formed at the approximate center of the web portion on the rear surface side of the casting wall can be obtained.

The welding ridge T formed in the substantially central portion on the rear surface side of the casting wall can be easily made into an H-shaped steel sheet pile by connecting the connecting plate 6 as shown in FIG.

[0023]

As described above, according to the present invention, based on the joint of the U-shaped steel sheet pile of the asymmetric Larsen type joint portion, one is provided with the conventional U-shaped steel sheet pile, and the other is provided with the protrusion instead of the flange. By forming an asymmetrical joint part, it became possible to make the front wall after casting into a completely flat surface. Moreover, because the retaining ridges are provided along the claws,
The placing work can be done smoothly. Furthermore, since it is possible to perform the groove-type rolling in which the molds can be easily released in the intermediate finish rolling step, the manufacturability is excellent. Further, by providing a welding protrusion on the back surface of the steel sheet pile and joining the two steel sheet piles by welding with a connecting plate, it is possible to easily make an H-shaped steel sheet pile having a large section modulus.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state in which a steel sheet pile of the present invention is cast on a connecting wall.

FIG. 2 is a process drawing of the die rolling of the steel sheet pile according to the present invention.

FIG. 3 is a schematic diagram of an example in which a steel sheet pile according to the present invention is welded to form an H-shaped steel sheet pile.

[Explanation of symbols]

 A Height of steel sheet pile B Height of hole die (a) C Biting generation portion H Thickness of initial cross section e Depth of ridge hole die Δe Unsatisfied portion f Height of ridge portion, depth of hole die Δg Thickness-unfilled area θ Ridge section Hole-type inclination T Weld projection

Claims (2)

[Claims] 1. A linear steel sheet pile having asymmetrical Larsen type joint portions provided at both ends of a web portion, wherein one of the joint portions has a flange portion bent and formed on the rear surface side of the casting wall at one end of the web portion. It is configured by providing a key type claw at the position, and the other joint part that engages with this,
It is configured by projecting a retaining ridge for preventing disengagement of the claw from the key-shaped claw formed flush with the driving surface at the other end of the web portion on the rear side of the driving wall with an engagement interval. Further, a linear steel sheet pile is formed by forming a welding ridge for connection at substantially the center on the rear surface side of the casting of the web portion. 2. A Larsen-type joint having asymmetric key-shaped claws formed at both ends of the web portion, and the web portion is
While flattening the surface of the casting wall, on the back side thereof, in addition to the flange and the ridges along the key claws, in the rolling method of the straight steel sheet pile forming the welding ridges, first, edging rough rolling In the intermediate rolling process and finish rolling process, in which the protrusion is roughly formed on the back side of the casting wall with the hole shape, and then the protrusion is shaped, the inclination of the protrusion hole shape should be increased without satisfying the height. By the pass that makes the rolled material easy to separate from the roll hole mold, and the path that makes it easier for the rolled material to separate from the roll hole mold by not satisfying the thickness direction of the protruding hole mold while satisfying the height, A method for rolling a straight-lined steel sheet pile, which comprises performing a groove-type rolling which repeats alternately.