JPH04330113A - Straight shape steel with joint asymmetrical to left and right and manufacture thereof - Google Patents

Abstract

PURPOSE:To accomplish a joint excellent in the fitting tensile strength by forming a female joint member and a male joint member at ends of webs provided with constant effective width, and performing a rolling process while the female member is curved outward of the web and the male member curved to the web side. CONSTITUTION:A female joint member 2 is provided at one end of each web 1 with the effective width W made constant, and a male joint member 3 provided at other end of each web. The female member 2 is curved outward of the web 1 so as to form an arc claw having a certain radius constituting an opening corresponding to the thickness tW. The male member 3 is curved to the web 1 side, wherein the one-side arc claw length shall be 1-5 times as large as the claw thickness tFM. When the male member 3 is fitted in a mating female member 2 and a pull is given, the male claw bites into the inner surface of the female claw, which should increase the fitting tensile strength and allow complying with the manufacture effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for rolling forming a linear steel section having a joint that is horizontally asymmetrical and vertically symmetrical.

(Prior Art) As a general method for manufacturing continuous joint type steel sections, there is a conventional so-called caliber rolling method for straight steel sheet piles, as shown in FIG. In the same figure, the rough shaped steel billet BB is a material made in a blooming factory or a foundry, and this material BB is
The product is produced by rolling sequentially in each of the grooves from No. 13 to K1, but since this method is mainly based on the grinding action of the side walls of the upper and lower rolls, the type of each of the holes is the closed hole type (Clo
sedPass) becomes an essential component of the array. For this reason, the amount of roll modification due to hole shape wear is large, and the roll consumption rate is high.In addition, large amounts of rolling oil and roll cooling water are required, and if this is insufficient, the shape of the joint part of the product will be unstable. This makes rolling work extremely difficult. Moreover, since there are many holes, a long roll body length is required, and it is difficult to manufacture wide straight steel sheet piles with a large effective width W.

As a solution to this problem, there is a so-called universal rolling method disclosed in Japanese Patent Publication No. 47-47784, which is a rolling method that eliminates forming defects by applying direct pressure to the raw material portion forming the joint. A typical example of this universal rolling method is shown in FIG. 9, and by performing universal rolling in intermediate rolling sections K4-1, 2, and 3, it is possible to manufacture a rectangular billet material SL. In addition, as disclosed in Japanese Patent Publication No. 58-38241, the finishing universal rolling method is also adopted for the finishing hole type K1, and by regulating the hole width of the left and right joints with vertical rolls inserted into the left and right joints, Means for suppressing variations in joint hole width are also well known. However, even with this method, relatively deep and complicated holes are required for the upper and lower horizontal rolls, and the above-mentioned problems cannot be solved.

As another measure, the shape of the straight steel sheet pile was changed to a product shape that is easier to roll, and improvements were made so that it could be rolled using so-called universal rolling equipment for H-section steel and by means similar to the rolling method for H-section steel. There is a means. The technique described in Japanese Patent Publication No. 55-11921 shown in FIG. 10 and the technique described in Japanese Patent Application Laid-Open No. 1987-1913 shown in FIG. 11 are examples of this. Although the problem has been resolved, the target is the manufacture of straight steel sheet piles of specific sizes, and the creation of different web thicknesses and the forming of flange widths according to various web thicknesses are very narrow due to modeling constraints. There was a problem that the range had to be limited.

On the other hand, various shapes have been proposed for joints for straight steel sheet piles, but the sixth typical male joint that fits into the arc-shaped female joint (claw) targeted by the present invention is Figure (b)
There are Y-type and T-type as shown in , (c). However, with this type of nail shape, when the female and male nails that are fitted together are pulled together, there is a risk that the tips of each will deform and separate.

(Problems to be Solved by the Invention) The present invention solves the following problems when producing by rolling a linear steel section having a continuous joint that is bilaterally asymmetrical (male-female) and symmetrical vertically (front and back).
The web thickness can be divided into desired sizes without causing joint shape defects, bending during rolling, or reductions in roll consumption, etc., and flanges with asymmetric width dimensions can be created for female and male joints. By molding and bending the flanges into the respective joint shapes,
It is possible to obtain a joint with excellent fitting tensile strength, and this straight section steel with a joint with excellent fitting ability is rolled by utilizing the existing H-beam steel universal rolling equipment row as much as possible. The purpose of this invention is to provide a method for molding.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration. That is, a female joint and a male joint are formed at each end of the web in the width direction with a constant effective width W and a thickness tw depending on the purpose of use, and the female joint is symmetrical on the front and back of the web, and the female joint is located on the outside of the web. The male joint is curved toward the web, and the length of one side of the arcuate nail is 1 to 1 of the nail thickness tFM. This is a linear steel section with a left-right asymmetrical joint characterized by 5 times the width.

(Operations/Examples) Hereinafter, operations and examples of the present invention will be described with reference to the drawings.

The straight steel sections with asymmetrical joints of the present invention may be used as a series in the construction of deep underground walls, and because the above-ground and underground parts receive different earth pressures, the web thickness tw It is necessary to increase the rigidity and strength by increasing the size in areas where pressure is high.

That is, as shown in FIG. 1, within the series, the width W (hereinafter referred to as effective width W) from the center of the female joint to the base of the male joint in web 1 is constant, and the web thickness t
w is a predetermined dimension corresponding to the part to be used.

At both ends of the web in the width direction, a female joint 2 is provided at one end and a male joint 3 is provided at the other end. As shown in FIG. 2, the female joint 2 has claws 2a and 2b forming an arc with a constant curvature r1 on the outside of the web 1, and openings k are formed at the tips of the claws 2a and 2b. Fig. 2(a) shows the same series of claws with a thin web thickness tw1, and Fig. 2(b) shows a type with a thick web thickness tw2. is ■1=■2, and the aperture k1-tw1=k2
-tw2. As shown in Fig. 3, the male joint 3 is
The claws 3a and 3b curve in the width center direction of the web 1 to form a circular arc. Fig. 3(a) shows a type with a thin web thickness tw1, and Fig. 3(b) shows a type with a thick web thickness tw2 of the same series.
/2)=■32-(tw2/2). Each claw 3a
, 3b has a constant curvature r so as to fit inside the female joint 2.
2, and the thickness tFM of each claw 3a, 3b is designed so that the relationship with the length 3 of each claw is 3/tFM=1 to 5. That is, when ■3/tFM is less than 1, bending deformation is difficult, and when it exceeds 5, the strength is insufficient.

When the male joint 1 having such a shape is fitted into the female joint 2 as shown in FIG. It will be in a state where it will be bitten into the inner surface of the case, and it will have a large fitting tensile strength. In addition, for example, when configuring a continuous wall with great depth, it is possible to select steel sections with different rigidities (different web thicknesses) in a series depending on the part where they are used, and even if they are joined continuously, the joint size will be Connection is possible without twisting, and continuous piling work can be carried out smoothly and without any trouble. still,
During construction, lay the male joint before the female joint.

Straight section steel having the above-mentioned left-right asymmetrical joint of the present invention (
Hereinafter referred to as straight section steel. ) is rolled and formed as follows.

FIG. 4 shows an example of a rolling forming method applied to the production of asymmetric straight steel sections of the present invention, and FIG. 5 shows an example of a rolling process in which the method of the present invention is implemented.

In the rough rolling process of the present invention, breakdown mill BD
Different flange forming hole types KAL. A thin slab with a rectangular cross section or a dogbone shaped steel piece is edged multiple times using upper and lower horizontal rolls 20a and 20b having a horizontal roll of 4 to form asymmetrical flanges 10a and 10b.
The material is processed into a roughly formed material 10 having a dogbone shape.

Next, in the intermediate rolling process of the present invention, a universal mill U and an edger mill E are arranged, and the rough shaped material is formed by the hole type KAL. 3, the web thickness is set to a predetermined thickness within the series, the width dimensions of the left and right flanges 11a and 11b are made different, and the intermediate rolled material 11 is rolled and shaped to have a substantially H-shaped cross section with a constant web width. Here, the hole type KAL of universal mill U. The horizontal rolls 21a and 21b constituting the rolls 3 have flat surfaces that press the web surface of the intermediate rolled material 11, and preferably the side surfaces that contact the inner surface of the flange have an outward inclination angle α (approximately 3 to 10 degrees). The inner surface of the flange is restrained using the rolls formed as described above, and the opening degrees of the horizontal rolls 21a and 21b are adjusted to obtain a desired web thickness. That is, these horizontal rolls 21a, 21
b has the same profile as the horizontal roll in a conventional universal mill for H-shaped steel rolling, and can be shared or diverted. On the other hand, the vertical rolls 30a and 30b have rolls whose peripheral surfaces that press the flange surface of the intermediate rolled material 11 are formed almost flat (hereinafter referred to as flat vertical rolls).
Similarly, these flat vertical rolls 30a, 3
0b can also use flat vertical rolls used in conventional finishing universal mills for rolling H-shaped steel.

That is, by using the flat vertical rolls 30a, 30b together with the horizontal rolls 21a, 21b, the widths of the joint portions, that is, the left and right flanges of the straight section steel can be made different widths, and the wall thickness can be formed to a predetermined thickness. The product shape is reasonable in terms of joint performance and economical with less wasted parts, and the web deviation of the intermediate rolled material 11 and the difference in upper and lower flange wall thickness can be reduced.

Next, the intermediate rolled material 11 rolled by the universal mill U is transferred to the hole type KAL of an edger mill E arranged in pair with the universal mill U. 3E, the intermediate rolled material 11' is formed so that the ends of the flanges 11a' and 11b' have the lengths of female and male claws. Although the horizontal rolls 22a and 22b of this edger mill E do not actively roll down the web surface of the intermediate rolled material 11',
By simultaneously restraining both ends of the web surface and rolling down the tips of the flanges 11a' and 11b', the width of one flange 11a' becomes the length of the claw (■1 or ■2) that curves outward from the web, and the width of the other flange 11b' The edging is adjusted so that the width is the length of the claw (■31 or ■32) that curves inward to the web. In this step, the web can be accurately held at the center of the flange while performing such flange forming.

The intermediate rolled material 11' is then processed by a flange bending mill S.
will be introduced in Flange bending mill S is hole type KAL
．． A stopper part F that locks the tip of the flange 12a on one side.
The flange 12a provided with the flange 12b' has an arcuate preformed hole type Fp that bends the flange 12a to the outside of the web, and the flange 12b' is provided on the other side.
It has a holding part RM that supports. That is, such a hole type KAL. A flange bending mill S having 2 is used to form a preform 12 with flanges 12a bent to the outside of the web to facilitate work in the next finishing step.

The preformed material 12 is finished into the final product 1 by a finishing rolling mill F. Upper and lower horizontal rolls 2 of finishing rolling mill F
4a, 24b hole type KAL. 1 has a body part that presses a part of the web, a circular finishing hole mold Ra on one side of the body that curves the flange 12a outward, and a half-arc finishing hole mold Rb that bends the flange 12b inward on the other side. It is set up.

That is, finishing hole types Ra and Rb each have a curved surface.
Accordingly, it is possible to manufacture a product 1 having the same width W within the series by forming a female claw 2 that is curved to the outside of the web and has an opening width k corresponding to the web thickness tw, and a male claw 3 that is curved to the inside of the web. can.

The straight steel section having a left-right asymmetrical joint of the present invention manufactured as described above can be used continuously in a box-shaped sheet pile or a circular cell, for example, as shown in FIGS. 7(a) and (b). can. That is, FIG. 7(a) shows an example in which a box-shaped sheet pile is connected by welding the left-right asymmetric section 7 of the present invention to each flange of the H-beam 4, and FIG. 7(b) shows an example of a male joint of the present invention. This is an example of a circular cell in which the female-male joints of the members 7, 7 are connected and continuously engaged in a circular manner.

By fitting the female joint 2 and the male joint 3 of the linear steel section according to the present invention in this manner, the tensile strength of the joint fitting is greatly increased. Each joint shape shown in FIG.
(a) shows the male joint 3 of the present invention engaged, (b) shows the conventional Y-shaped male joint 5, and (c) shows the conventional T-shaped male joint 6. The strength when the joint was pulled in the direction of arrow S (fitting tensile strength) was measured. Table 1 shows the measurement results (actual measurement value ton/m = converted value per 1 meter wall length).

From the above results of the invention, it can be seen that the joint of the invention type [FIG. 6(a)] is extremely superior. That is, arrow S
When subjected to a tensile force in the direction of
, P' to take the shape shown by the broken line, and when the limit value (measured values in Table 1) is exceeded, the male-female joint separates. When fitting joints of the same thickness and shape, the tensile strength is approximately the "meshing depth" (male joint external width g - female joint k)
is proportional to. In the joint of the present invention [Fig. 6 (a)], g increases as the female joint deforms under tensile force, whereas in the conventional type [Fig. 6 (b) and (c)], g decreases. Therefore, there is a large difference as shown in Table 1. In addition, the slip resistance on the contact surfaces within the joint also has an effect on tensile strength, and in the type of the present invention, the sharp edge of the male toe contacts the inner surface of the female joint, making it difficult to slip even if the joint shape is deformed by tensile force. In contrast, in the conventional type, as the joint deforms due to tensile force, the contact surfaces become smooth and slippery, which is one of the reasons why the strength cannot be increased.

(Effects of the Invention) The continuous joint type steel section of the present invention has extremely high self-weight fitting properties and extremely high fitting tensile strength, so it is highly reliable and can be stably used in civil engineering work. Also, when manufacturing this, a set of existing H-shaped steel universal rolling equipment can be used in part, which has a great advantage in terms of production. In addition, we can efficiently manufacture high-quality continuous linear steel sections with stable joint shapes and excellent workability, even in small lots.
We can respond quickly and accurately to the current diversifying market needs.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the straight steel section of the present invention;
Figures (a) and (b) are diagrams showing the shape of one joint of the steel section of the present invention, Figures 3 (a) and (b) are diagrams showing the shape of the other joint of the steel section of the invention, and Figure 4. 5 is an explanatory diagram showing the order of the steps, and FIGS. 6(a) and 6(b) are diagrams showing the fitting of joints of the present invention and the conventional method. Figures 7(a) and 7(b) are diagrams showing tensile conditions, and are explanatory diagrams showing an example of using the left-right asymmetric linear steel section manufactured by the present invention as continuous walls and circular cells of a box-shaped steel sheet pile. The figure is an explanatory diagram showing the rolling method of vertically asymmetrical and laterally symmetrical straight steel sheet piles using the conventional groove rolling method.
Figure 9 is an explanatory diagram showing the rolling method of vertically asymmetrical and laterally symmetrical straight steel sheet piles in which the universal rolling method is applied to a part of the conventional groove rolling method. FIG. 11 is an explanatory diagram showing a rolling method for straight steel sheet piles, and FIG. 11 is an explanatory diagram showing a method for rolling vertically asymmetrical and laterally symmetrical straight steel sheet piles using the conventional universal rolling method. BD...Breakdown mill U...Universal mill E...Edger mill S...Flange bending mill F...Finishing mill 1...Web 2...Female joint 3...Male joint 4...H-shaped steel 5...Y-type male joint 6...T-type male joint 7...Shaped steel of the present invention 10...Roughly shaped material 10a, 10b...Flanges 20a, 20b of the roughly shaped material...Upper and lower horizontal rolls 11, 11' of BD
...Intermediate rolled material 11a, 11b...Flange 12 of intermediate rolled material...Preformed material 12a, 12b...Flange 21a, 21b of preformed material
…Horizontal rolls 30a, 30b of universal mill U…Vertical rolls 22a, 22b of universal mill U…Divided horizontal rolls 23a, 23b of edger mill E…Horizontal rolls 24a, 24b of flange bending mill S…Horizontal roll Fs of finishing mill F ...Flange tip stopper part Fp of flange bending and forming mill S...Preforming hole type Ra, R of flange bending and forming mill S
b…Finishing hole type applicant Nippon Steel Corporation sub-agent Patent attorney Hiroaki Tamura

Claims (2)

[Claims] Claim 1: A female joint and a male joint are formed at each end in the width direction of the web, the effective width W being constant and the thickness tw depending on the purpose of use, the front and back sides of the web being symmetrical, the female joint being The web consists of an arcuate claw with a constant radius that is curved outward and forms an opening width corresponding to the thickness tw, and the male joint is curved toward the web side, and the length of one side of the arcuate claw is equal to the claw thickness tFM. 1 to 5
A straight section steel with a left-right asymmetrical joint characterized by double. [Claim 2] After the slab material is made into a left-right asymmetrical dogbone-shaped rough-shaped material in a rough rolling process using a breakdown mill, the rough-shaped material is intermediate-rolled with a universal mill and an edger mill, and then the rough-shaped material is rolled in a universal mill. The inner width of the web part is made constant, the flanges are made to have a predetermined thickness on the left and right sides, and asymmetrical widths on the left and right sides, and the width of each flange is reduced while restraining the web with an edger mill to make the left and right sides each the optimum flange width. Then, one long side flange is preliminarily bent outward with a horizontal forming roll having a preformed caliber consisting of an arcuate part and a locking part, and the preformed material is transferred to a horizontal roll of a finishing mill. It has a left-right asymmetric joint characterized by bending the pre-processed flange on one side into an arc shape having a predetermined opening size while simultaneously bending the short width flange on the other side inward into an arc shape. Method for manufacturing straight steel sections.