JPH09182902A - Continuous joint shaped steel and its rolling method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] When manufacturing a continuous joint shape steel by rolling, the web thickness and the claw portion thickness are made into desired desired sizes according to the purpose of use, and the claw tip opening width is obtained. (EN) A continuous joint shaped steel having a constant value and excellent fitting strength, and a manufacturing method thereof. A vertical roll of a universal mill in an intermediate rolling step in a rolling process of a continuous joint shape steel having left and right claws formed by bending a web having a predetermined thickness and width in a width direction on both sides in a width direction. After transferring and rolling the unevenness 1s on the outer surface of the flange portion, the flange is bent by a flange bending mill and a finishing mill to form a continuous joint shaped steel having the unevenness 1s on the inner surface of the claw portion,
Due to the unevenness, the friction coefficient of the contact portion between the claw portion 1b of the continuous joint shaped steel and the male joint portion 1d of the connecting member 6 is increased, so that the male joint portion 1d is not easily separated from the claw portion 1b and is fitted. Improve strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous joint section steel and a method for rolling the section steel.

[0002]

2. Description of the Related Art FIG. 9 (a) shows an example of the most typical conventional shape of a continuous joint shape steel 1 to which the present invention is applied. In the figure, the continuous joint shape steel 1 has a female joint portion 1b having a thickness TF at both ends of a web portion 1a formed to have a predetermined web thickness TW. The distance W between the center portions of the left and right female joint portions 1b is called the effective width. 9 (b), (c), and (d) show an example of the product shape of the connecting member 6 having a male joint portion that fits into the female joint portion 1b of the continuous joint shape steel 1, and FIG. The connecting member 6 is a simple H-shaped steel with a short flange width.
In the connecting member 6 of (c), the flange serving as the male joint portion 1d is curved outward, and in the connecting member 6 of FIG. 9 (d), the flange serving as the male joint portion 1d is curved inside, and the female joint portion is curved. Inner space of joint formed when mated with
Is a deformed H-section steel with a large 9 (b), 9 (c), which are the continuous joint shape steel 1 of FIG. 9 (a) and its connecting member.
The cross-sectional shape of the connecting member shown in (d) is completely symmetrical vertically and horizontally. Further, the product size of the conventional straight type steel sheet pile having a similar shape is generally set for each of the effective width W, the web thickness TW and the joint thickness TF, but the product of the continuous joint shaped steel 1 which is the object of the present invention. Size is effective width W
Have the same thickness in the series, but the web thickness TW and joint thickness TF have various thickness configurations.

Typical applications of these continuous joint shaped steels are 2 as shown in FIGS. 10 (a), (b), (c) and (d).
It is used as a so-called box-shaped steel sheet pile, in which a H-shaped steel 3 or a plate 5 is welded to a web of a continuous joint shaped steel 1 to form a section having an H-shaped cross section. 10A and 10C show an example in which the H-shaped steel 3 is welded, and FIGS. 10B and 10D show an example in which the plate 5 is welded. 10 (a) and 10 (b), a large H-section steel 2a having a wide web equivalent to the effective width W of the continuous joint section steel 1 is used as a member of the male joint.
In FIGS. 10 (c) and (d), a small H-shaped steel 2b having a narrow web is used as a member of the male joint. In addition, Figure 10
In (a), the stiffening member 4 for preventing deformation is used in order to compensate for the insufficient strength of the continuous joint shaped steel 1 and the large H-shaped steel 2a.

The characteristics of this steel box-type steel sheet pile are that the wall thickness can be made thin because it has excellent cross-sectional performance, and the surface of the constituent members is smooth, making it suitable for the wall function and facilitating a composite structure with concrete. The specific applications are earth retaining walls, foundation piles, earthquake-resistant walls for permanent construction, landslide deep foundation piles, etc.
Now, with the recent trend of active development of underground space, increasing depth and construction in urban areas have become mainstream, and for the continuous joint shaped steel 1 which is the basic member of the box-shaped steel sheet pile, There is a demand for improved fitting performance of joints with an emphasis on workability, and the provision of product series with a wide range of cross-sectional performance has become an important issue. Especially when constructing a deep underground continuous wall, since the earth pressure is small near the ground, the continuous joint type steel 1
The web thickness TW may be small, but in the underground where the earth pressure increases, it is necessary to increase the web thickness TW according to the increase of the earth pressure to increase the rigidity of the box-type steel sheet pile. In this case, the joint thickness TF of the joint portion is also increased as the web thickness TW increases. At the time of construction, relatively short box-shaped steel sheet piles made of continuous joint shaped steels 1 having different plate thicknesses are sequentially inserted into the soil that has been muddyed, and laid by bolting in the longitudinal direction. On the other hand, as shown in FIG.
Since the cross-sectional shapes and dimensions of the male joint materials of (b), (c), and (d) are constant over the entire laying length, the joint portion of the continuous joint shaped steel 1 has the same male joint material regardless of the product size. Uniform fitability is required.

As a general means for producing a continuous joint shape steel, there is a so-called caliber rolling method of the conventional straight steel sheet pile shown in FIG. In the figure, the rough-shaped billet BB
Is a raw material produced in a slab or a casting plant, and this raw material BB is rolled into a product by successively using each of the hole dies of K13 to K1. This method mainly uses the grinding action by the side walls of the upper and lower rolls. Because of the above rolling, the type of each hole type is a closed hole type (Closed Pass) is an indispensable constituent element of the hole type series. For this reason, the amount of roll refurbishment due to hole-type wear is large, the roll unit consumption is high, and a large amount of rolling oil and roll cooling water are necessary.If this is insufficient, the joint shape of the product becomes unstable. This makes rolling work extremely difficult. Also, since the number of hole types is large, a long roll length is required and the effective width W
It is difficult to manufacture wide-width continuous joint shape steel with large

As a solution to this problem, there is a so-called universal rolling method disclosed in Japanese Examined Patent Publication No. 47-47784, which is a rolling method in which a material defect forming a joint portion is directly subjected to reduction to remove defects in forming. A representative example of this universal rolling method is shown in FIG. 12, and it is possible to manufacture from a rectangular steel strip SL by performing universal rolling at K4-1, 2, 3 in the intermediate rolling section. Further, in Japanese Patent Publication No. 58-38241, the finish universal rolling method is also adopted for the finish hole type K1, and the vertical width of the left and right joints is regulated by the vertical rolls fitted in the left and right joints, thereby varying the hole width of the joints. Means for suppressing are also well known. However, even in this method, the upper and lower horizontal rolls require a relatively deep and complicated hole shape, and the above-mentioned problems cannot be solved.

As another measure, the shape of the straight type steel sheet pile is changed to a product shape that can be easily rolled, so that so-called universal rolling equipment for H-shaped steel can be used and rolling can be performed by means similar to the rolling method of H-shaped steel. There is an improved way. FIG.
The Japanese Patent Publication No. 55-11921 and the Japanese Patent Publication No. 55-1913 shown in FIG. 14 are examples thereof, and the problems in the case of rolling in the hole type having the closed hole type are solved. However, it is intended to manufacture a linear steel sheet pile of a specific size.

The present inventors have applied the conventional method for rolling a straight type steel sheet pile to the web thickness TW and the claw portion thickness TF.
Due to the restrictions on the molding, it is unavoidable to limit the manufacturing of the claws to a very narrow range. Furthermore, using the same roll group, the claws (flange) shapes and thicknesses of various predetermined sizes, and the web thickness, In addition, in order to solve the problem that it is impossible to roll a continuous joint shape steel having a constant effective width with a substantially constant claw opening width, Japanese Patent Publication No. 07-67561 has already been proposed. In this rolling method, as shown in FIG. 8, the rough shaped material is subjected to intermediate rolling mills U and E so that the flange portion has a predetermined thickness and width and the web portion has a predetermined thickness and a constant inner width. The flange is formed while being formed into an intermediate rolled material having a substantially H-shaped cross section, and subsequently the front end of the flange is restrained by the curved portions of the upper and lower horizontal rolls 22a and 22b having stopper portions at the widthwise ends of the intermediate finishing rolling mill S. After bending the part outward, the upper and lower horizontal rolls 23a, 2 of the finishing mill F are
A continuous joint profile steel having a predetermined web thickness and a claw shape / thickness by adjusting the gap of 3b, a joint opening width being substantially constant and an effective width being constant, and being continuously rolled. This is a rolling method for continuous joint shaped steel.

[0009] However, since the continuous joint section steel attaches importance to the fitting property with the connecting member for the purpose of use, the strength for connecting the continuous joint section steel and the connecting member is higher than that of the straight type steel sheet pile. However, there is a problem that the so-called fitting strength is considerably reduced. In order to solve this problem, it is necessary to improve the shape of the continuous joint shape steel.

[0010]

DISCLOSURE OF THE INVENTION The present invention is directed to the production of continuous joint shaped steel by rolling without causing defects in the joint shape, bending during rolling, reduction in roll unit, and the like. -Providing a continuous joint shaped steel having a claw part having a desired thickness according to the purpose of use and having a constant opening width at the claw tip and excellent fitting strength, and a means for producing the same. The purpose is to

[0011]

The gist of the present invention is (1)
In a continuous joint shaped steel having a left and right claws that are bent and formed in a substantially arc shape on both sides in the width direction of a web having a predetermined thickness and width, and the opening widths of the tips of opposing claws are formed to be constant on the left and right. A continuous joint shaped steel characterized in that unevenness is formed on the inner surface of the claw portion; (2) a rough rolling step in which a breakdown mill for rolling a raw material into a roughly H-shaped rough shaped material is arranged; Intermediate rolling process with a universal mill and an edger mill for rolling a shaped material into an intermediate rough rolled material, and an intermediate finish with a flange bending mill for bending the flange of the intermediate rough rolled material to the outside and rolling it into an intermediate finished material In the method for rolling a continuous joint shaped steel by a step and a finishing rolling step in which a finishing mill is arranged to bend the flange of the intermediate finish material into a predetermined claw shape and finish the opening width of the claw tip part to be almost constant. The engraved unevenness on the peripheral surface of the vertical roll of the universal mill, the unevenness is formed on the outer surface of the flange of the intermediate rough rolled material by the vertical roll, a method for rolling a continuous joint shaped steel, (3) A plurality of irregularities continuous in the rolling direction on the peripheral surface of the vertical roll of the universal mill are engraved, and a plurality of irregularities continuous in the rolling direction on the outer surface of the flange of the intermediate rough rolled material are formed by the vertical roll. (2) Rolling method of continuous joint shaped steel according to (2), (4) Engraving a plurality of irregularities of discontinuity in the rolling direction of the peripheral surface of the vertical roll of the universal mill, In the rolling method for continuous joint shaped steel according to (2), a plurality of irregularities are formed on the outer surface of the flange of the intermediate rough rolled material in a rolling direction by a roll.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation of the present invention will be described below with reference to the drawings. The cross-sectional shape of the continuous joint shaped steel of the present invention is
As illustrated in FIG. 1, the claw portion 1b that has the same shape as the web 1a on the left and right sides
, The effective width W of which is constant within the series, and the web thickness Tw is formed into a predetermined size corresponding to the laying position. Further, the continuous joint shape steel of the present invention has the claw portions 1b bent at a constant curvature at both ends in the web width direction, and the inner surface of the claw tip portion has the irregularity 1s which is a feature of the present invention. To be done. As the cross-sectional shape of the unevenness, a rectangular shape is shown in FIG. 1, but a triangular shape, an arc shape, or another curved shape may be used. Further, although FIG. 1 shows a case where a plurality of irregularities 1s are formed, other irregularities may be formed in a fixed pattern on the inner surface of the tip of the nail or randomly distributed. Further, the shape of the unevenness in the lengthwise direction may be any pattern such as continuous, discontinuous in a certain fixed pattern, or randomly discontinuous. As will be described later, by forming the unevenness 1s, the fitting strength between the claw portion 1b and the male joint portion 1d of the connecting member 6 shown by the broken line can be increased. Further, the opening width k of the tip end portion of the claw is constant, and good fitting property with the male joint portion 1d of the connecting member 6 is maintained.

In FIG. 2, a claw portion 1b of the present invention having a plurality of concavities and convexities 1s continuous in the longitudinal direction of FIG. 1 and a connecting member 6 having a male joint portion 1d curved inside the flange of FIG. 9 (d). The state in which and are fitted is illustrated. For comparison, FIG. 3 shows a state in which the conventional claw portion 1c having no unevenness and the connecting member 6 having the male joint portion 1d curved inside the flange of FIG. 8D are fitted. When the tensile force F2 acts on each joint fitted in practical use, in the case of FIG.
Since d easily moves to the outside of the claw 1c along the inner surface of the conventional claw 1c having no unevenness 1s, the tip of the thin claw 1c spreads in the direction of the arrow as shown by the broken line, and the opening width k
Increases to k2, and finally becomes larger than the claw width g of the male joint portion 1d, and the male joint portion 1d separates. On the other hand, in the case of the claw portion 1b of the present invention shown in FIG. 2, since the projections and depressions 1s are provided on the tip portion of the claw, the friction coefficient of the contact portion between the male joint portion 1d and the claw portion 1b becomes high and the male joint portion 1d becomes It is hard to slip outside.
Therefore, the deformation of the tip portion of the claw portion 1b can be suppressed to be small even when the tensile force F1 is applied, and since the root portion of the claw portion 1b is thick and the bending rigidity is large, the entire deformation of the claw portion 1b is also possible. It is suppressed to a small value, and as a result, the opening width k expands only to k1, which is considerably smaller than k2, and the male joint portion 1d does not separate even when a tensile force larger than the force tensile force F2 acts. That is, the fitting strength is increased by forming the unevenness at the tip of the claw.

Next, FIGS. 4 (a) and 4 (b) show an example of a rolling process when the present invention is applied to the production of continuous joint shaped steel. In the rough rolling step of the present invention, a slab having a rectangular cross section or a dogbone-shaped steel slab is used as a raw material by the upper and lower horizontal rolls of the breakdown mill BD to perform edging a plurality of times to form a roughly H-shaped dogbone-shaped rough shaped material. To do. Since this is the same process as the conventional rough forming of a shaped steel having a flange such as an H-shaped steel, a detailed description thereof will be omitted.

Next, in the intermediate rolling step, universal mill U1, edger mill E and universal mill U2
The rough shaped material by a predetermined web thickness, flange thickness,
And, it is roll-molded into an intermediate rough rolled material having a substantially H-shaped cross section with a constant web inner width having a web 1aU and a flange 1bU having a flange width. Horizontal roll 2 of universal mill U1
01a, 201b and the external shape of the horizontal rolls 20a, 20b of the universal mill U2 are the same as those shown in Japanese Patent Publication No. 07-67561.
Alternatively, the surface for pressing down 1 aU is flat, and preferably the side surface contacting the inner surface of the flange has an inclination angle α (approximately 3 to 1).
0 °) and can be commonly used as a horizontal roll of a conventional universal mill for H-shaped steel rolling. Further, the vertical rolls 301a and 301b of the universal mill U1 have a flat surface for pressing down the flange 1bU1 of the intermediate rough rolled material, which can also be shared with the vertical roll of the conventional universal mill for H-shaped steel rolling. . Further, the vertical rolls 30a and 30b of the universal mill U2, which form the irregularities on the outer surface of the flange tip, are also used as the conventional vertical rolls for rolling H-shaped steel when the irregularities are fine enough to be erased by the finishing universal mill. it can. By adjusting the gap between the horizontal roll and the vertical roll, the desired web thickness and flange thickness are formed. A feature of the present invention is that unevenness is previously provided in a portion corresponding to the tip end portion of the vertical rolls 30a and 30b of the universal mill U2 in the flange width direction, and the flange is rolled by the vertical rolls 30a and 30b. It is to transfer and roll the unevenness on the tip of the flange.
At this time, if the unevenness is fine such as dulling that is applied to the roll surface to increase the friction coefficient, the material is caught in the roll, the flange portion extends in the rolling direction, and the width direction extends. Even if the molding position deviation of the unevenness occurs in each rolling pass due to the spread of the wrap, lap flaws do not occur, and U1-E
-U2 continuous multi-pass rolling can also be performed. However,
Since there is a problem that the fitting strength decreases when the unevenness is extremely fine, the U1-E-U2 continuous multi-pass rolling is adopted in consideration of the desired fitting strength, or the universal mill U is used.
Determine if rolling by 2 is limited to the final rolling pass only. The upper and lower rolls 21a, 2 of the edger mill E are also
The tip portion of the flange 1bE is mainly shaped by 1b. Upper and lower rolls 21a, 21b of the edger mill E
May have the same shape as the upper and lower rolls of a conventional edger mill, and mainly presses down the front end of the flange 1bE to reduce the web 1
It has a shape that does not positively reduce aE. In addition, as the edger mill E, the Japanese Patent Publication No. 05-3
By using an edger roll having a hole-type depth varying mechanism described in Japanese Patent No. 2128 or Japanese Patent Publication No. 06-18642,
Flange width reduction can be performed while restraining the web in each rolling pass, and high dimensional accuracy and good shape can be maintained.

In the next flange bending step, the intermediate rough rolled material having a substantially H-shaped cross section with various web thicknesses is rolled by the rough universal mill U and the edger mill E by the upper and lower horizontal rolls 22a and 22b of the flange bending mill S. The flange is bent outward to form an intermediate finishing material with the flange preformed. In the final finish rolling step, the web of the intermediate finish material is pressed down by the upper and lower horizontal rolls 23a and 23b of the finish mill F, and the finish bending of the flange is performed to bend and shape the web 1a in a substantially arc shape on both sides in the width direction. The continuous joint shaped steel of the present invention having the claw portion 1b, the concave and convex portions 1s formed on the inner surface of the claw tip portion, and the opening width of the claw tip portion formed left and right constant is finished.

The unevenness of the flange tip portion, which is a feature of the present invention, is formed by the vertical rolls 30a and 30b of the rough universal mill U2 shown in FIG. 4 (b). As the irregularities shown in FIG. 1, a plurality of irregularities which are continuous in the length direction, a plurality of irregularities which are discontinuous in the length direction, irregularities which are continuously distributed in the length direction or discontinuously distributed in the length direction There are various patterns such as unevenness. As shown in FIG. 5, a plurality of ridges and valleys continuous in the lengthwise direction are formed by engraving a plurality of ridges and valleys over the entire circumferential direction (rolling direction) of the portions corresponding to the flange tips of the vertical rolls 30a and 30b. Transfer molding is performed by performing universal rolling using a vertical roll. In addition, as shown in FIG. 6, a plurality of irregularities which are discontinuous in the length direction are formed by engraving a plurality of irregularities in a part in the circumferential direction of a portion corresponding to the flange tip end portions of the vertical rolls 30a and 30b. Transfer molding is performed by performing universal rolling using the vertical roll. The unevenness continuously distributed in the length direction is shown in FIG.
As shown in (a), asperities are engraved with a laser or an electron beam so as to be distributed in a constant pattern or randomly over the entire circumferential direction of the portions corresponding to the flange tips of the vertical rolls 30a and 30b, and the vertical rolls are Transfer molding is performed by carrying out universal rolling. As shown in FIG. 7 (b), the irregularities distributed discontinuously in the lengthwise direction are distributed in a constant pattern or randomly in a circumferential part of the portions corresponding to the flange tips of the vertical rolls 30a and 30b. Fine transfer patterns are formed by engraving fine irregularities with an electron beam and performing universal rolling using the vertical rolls. In the intermediate rolling step of forming the unevenness as described above, the unevenness is located on the outer surface of the flange tip portion, but after the subsequent flange bending, the unevenness is located on the inner surface of the claw tip portion. In addition, the vertical roll 30 is shown in FIG. 1, FIG. 2, FIG. 4B, and FIG.
In order to minimize the processing range of a and 30b, the case where the concavities and convexities are formed only on the inner surface of the tip portion of the claw is shown, but there is no problem even if the concavity and convexity are formed on the entire inner surface of the claw portion.

[0018]

[Examples] As examples, the fitting strengths of the continuous joint shaped steel of the present invention having unevenness on the inner surface of the claw tip and the conventional continuous joint shaped steel without unevenness were measured and compared. explain. The common dimensions of the continuous joint type steel used are
Web thickness 12 mm, effective width 700 mm, claw tip thickness 8 mm, claw average thickness 12 mm, claw center length 210
mm and the radius of curvature of the claw portion are 45 mm, and the continuous joint shaped steel of the present invention has a plurality of concavo-convex portions continuously formed in the length direction on the inner surface of the claw tip portion at four locations. Four types were prepared: one having a plurality of discontinuous irregularities, one having irregularities continuously distributed in the length direction, and one having irregularities discontinuously distributed in the length direction. The male joint portion of the connecting member has the same shape as 1d in FIG. The mating strength test conforms to JIS standards and is 1 from the rolled material in the length direction.
A 00 mm test piece was cut out, the continuous joint shaped steel and the connecting member were engaged with each other, and the tensile shaft and the web of the test piece were set so as to be parallel to each other. For a test piece having discontinuous unevenness, 50 mm is used for the uneven part,
The remaining 50 mm was defined as a portion without unevenness. Table 1 shows the fitting strength obtained by converting the test results per 1 m of the wall length.

[Table 1] From the above results, it is apparent that the fitting strength of the continuous joint shaped steel of the present invention is about 1.2 to 1.6 times that of the conventional continuous joint shaped steel, which is extremely excellent. It was also confirmed that the fittability was good. The continuous joint shape steel with discontinuous unevenness is applied when disposing male joints discontinuously in the length direction with the intention of improving concrete filling properties. It is not necessary to provide unevenness over the entire length of the steel claw tip, and the fitting strength can be increased by arranging the claw tip unevenness corresponding to the position of the male joint.

[0019]

EFFECTS OF THE INVENTION The continuous joint shaped steel of the present invention has good joint fitting properties and extremely high fitting strength. In addition, even when manufacturing this, it is not necessary to make major equipment changes, and it is possible to freely create multiple sizes of continuous joint shaped steels of web thickness and claw thickness with the same roll set of the existing H-shaped steel rolling mill row. You can The size of the materials used can be integrated, the number of rolling rolls and other auxiliary parts is small, and the number of roll changes can be minimized. Furthermore, since high quality and multi-size continuous joint shaped steel can be efficiently manufactured even in small lots, it is possible to meet market needs quickly and accurately.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a continuous joint shape steel of the present invention.

FIG. 2 is an explanatory view showing a fitting state of a claw portion having projections and depressions of the present invention and a male joint portion of a connecting member.

FIG. 3 is an explanatory view showing a fitting state of a conventional claw portion having no unevenness and a male joint portion of a connecting member.

FIG. 4 is an explanatory view of an example of a rolling method when the present invention is applied to the production of continuous joint shaped steel.

FIG. 5 is an explanatory view showing a method of forming a plurality of ridges and valleys continuous in the length direction on the outer surface of the flange tip portion.

FIG. 6 is an explanatory view showing a method for forming a plurality of irregularities which are discontinuous in the length direction on the outer surface of the flange tip portion.

FIG. 7A is an explanatory view showing a method for forming unevenness continuously distributed in the length direction on the outer surface of the flange tip portion. (B) Explanatory drawing which shows the forming method of the unevenness | corrugation which discontinuously distributes in the length direction on the outer surface of a flange front-end | tip part.

FIG. 8 is an explanatory view showing a conventional rolling method for continuous joint shaped steel.

FIG. 9 is a cross-sectional view showing an example of a continuous joint shape steel and a connecting member.

FIG. 10 is an explanatory view showing an example of using a continuous joint shaped steel.

FIG. 11 is an explanatory view showing a conventional method for rolling a vertically asymmetric left-right symmetrical linear steel sheet pile by a hole rolling method.

FIG. 12 is an explanatory view showing a rolling method for vertically asymmetrical left-right symmetrical linear steel sheet pile, in which a universal rolling method is applied to a part of the conventional hole rolling method.

FIG. 13 is an explanatory view showing a conventional method for rolling a vertically symmetrical left-right asymmetric linear steel sheet pile by a universal rolling method.

FIG. 14 is an explanatory diagram showing a conventional method of rolling a vertical asymmetrical left-right symmetrical linear steel sheet pile by a universal rolling method.

[Explanation of symbols]

BD ... Breakdown mill U ... Universal mill E ... Edger mill S ... Flange bending forming mill F ... Finishing mill 201a, 201b ... Horizontal roll of universal mill U1 301a, 301b ... Vertical roll of universal mill U1 20a, 20b ... Of universal mill U2 Horizontal rolls 30a, 30b ... Vertical rolls 21a, 21b of universal mill U2 ... Vertical rolls 22a, 22b of edger mill E ... Vertical rolls 23a, 23b of flange bending forming mill S ... Vertical rolls of finishing mill F 1a ... Continuous joint of the present invention Web of shaped steel 1b ... Claw portion of continuous joint shaped steel of the present invention 1s ... Asperity formed on inner surface of claw portion of continuous joint shaped steel of the present invention

Claims (4)

[Claims] 1. A continuous web having a left and right claw portions formed by bending into a substantially arcuate shape on both sides in the width direction of a web having a predetermined thickness and width, and the opening widths of the tip ends of the claw portions facing each other being constant left and right. A continuous joint shape steel, characterized in that, in the joint shape steel, irregularities are formed on the inner surface of the claw portion. 2. A rough rolling process in which a breakdown mill for rolling a raw material into a roughly H-shaped rough shaped material is arranged, and an intermediate rolling process in which a universal mill and an edger mill for rolling the rough shaped material into an intermediate rough rolled material are arranged. And an intermediate finishing step in which a flange bending mill for bending the flange of the intermediate rough rolled material to the outside and rolling it into an intermediate finished material is arranged, and the flange of the intermediate finished material is curved into a predetermined claw shape and a claw tip portion is formed. In a method of rolling a continuous joint shaped steel by a finishing rolling step in which a finishing mill is arranged to finish the opening width of substantially constant, unevenness is engraved on the peripheral surface of the vertical roll of the universal mill, and the vertical roll is used to A method for rolling a continuous joint shaped steel, comprising forming irregularities on the outer surface of a flange of an intermediate rough rolled material. 3. A plurality of continuous strips of protrusions and recesses that are continuous in the rolling direction on the peripheral surface of a vertical roll of a universal mill are formed, and the vertical rolls form a plurality of strips that are continuous in the rolling direction of the outer surface of the flange of the intermediate rough rolled material. The method for rolling a continuous joint shape steel according to claim 2, wherein irregularities are formed. 4. A plurality of discontinuous irregularities are engraved in the rolling direction on the peripheral surface of a vertical roll of a universal mill, and the vertical rolls discontinue in the rolling direction of the outer surface of the flange of the intermediate rough rolled material. The method for rolling a continuous joint shape steel according to claim 2, wherein the unevenness of the strip is formed.