JPH05317904A - Method for rolling shape steel for continuous wall - Google Patents

Abstract

PURPOSE:To continuously manufacture desired plural different cross sections in a longitudinal direction according to the utilization object by controlling a gap between upper and lower horizontal rolls during a finish rolling with a finishing mill and continuously changing a joint height in a roll caliber. CONSTITUTION:An intermediate finish rolled material 16 preforming-bending flange parts is finished to a final product 17 having a shape steel for continuous wall having plural different cross sections in the longitudinal direction to the joint part by the finishing mill F. The roll calibers on the upper and the lower horizontal rolls 23a, 23b in the finishing mill F are Kal.1a, 1b to form the flange bending finish caliber Ra for finish-forming the joint parts 18a, 18b. The Kal.1a is constituted of only the horizontal rolls but in the Kal.1b, vertical rolls 40a, 40b with projecting parts are arranged at both flanks of the upper and the lower horizontal rolls 23a, 23b, and the projecting parts 41a, 41b are fitted between the end parts of the upper and the lower flanges of the material to be rolled, and by regulating the width between the end parts, a female joint cross section is separately manufactured in the longitudinal direction according to the object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a continuous wall shaped steel used for a composite structure with concrete by rolling.

[0002]

2. Description of the Related Art An example of the most typical shape of a continuous wall shaped steel manufactured by the method of the present invention is shown in FIG. FIG. 3A is a front sectional view, FIG. 2B is a side view, and FIG. This continuous wall shaped steel 1 has a female joint 1A (cross section AA), 1B having a joint thickness T _F that opens in the axial direction of the web at both ends of the web 1W formed to have a predetermined web thickness T _W. (Cross section B-
B). In the conventional shaped steel for continuous walls, the cross-sectional shape of the joint has a uniform cross-section with only a narrow opening width k such as 1A, whereas the shape of the continuous wall targeted by the present invention is the same. The shaped steel has a shape in which a female joint 1A having a narrow opening width k and a wide female joint 1B having a wide opening width k are alternately and continuously repeated by lengths la and lb in the longitudinal direction. The distance W between the center portions of the left and right female joints 1A is called the effective width.

FIGS. 6 (a) and 6 (b) show an example of the product shape of a connecting member 6 having a male joint that fits into the female joint 1A of the continuous wall shaped steel 1, and the connecting member 6 of FIG. 6 (a) is shown. Is a simple H-shaped steel with a short flange width, and the connecting member 6 of FIG.
Is a deformed H-section steel in which a flange serving as a male joint is curved outward to increase a joint internal space (a pocket margin) formed when fitting with a female joint.

The cross-sectional shape of the continuous wall shaped steel 1 of FIG. 5 and the connecting member 6 shown in FIGS.
Both of them are completely symmetrical in the vertical and horizontal directions, but the present invention can be applied to the formation of a joint portion of a linear steel sheet pile having a similar conventional shape or an asymmetrical vertical and horizontal shape.

A typical application of continuous wall section steel is shown in FIG.
As shown in (a) to (d), it is used as a so-called box-type steel sheet pile having an H-shaped cross section obtained by welding the H-shaped steel 3 or the plate 5 to two webs of the shaped steel 1 for continuous walls. Is. 7A and 7C show an example in which the H-section steel 3 is welded, and FIGS. 7B and 7D show an example in which the plate 5 is welded. 7 (a) and 7 (b), a large H-section steel 2a having a wide web equivalent to the effective width W of the continuous wall section steel 1 is used as a male joint member. In c) and (d), a small H-shaped steel 2b having a narrow web is used as a member of the male joint. Further, in FIG. 7A, a deformation preventing stiffening member 4 is used to compensate for the insufficient strength of the continuous wall 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 is excellent in cross-sectional performance, it is suitable for the wall function because the surface of the constituent members is smooth, and it is suitable for a composite structure with concrete. Its specific applications include continuous retaining walls for underground space construction, foundation piles, earthquake-resistant walls for permanent construction, and landslide deep foundation piles. FIG. 8 is a view showing a usage state in which the structure is combined with concrete.

When a composite structure with concrete is used, the joint is filled with concrete in the conventional shape as shown in FIG.
Although it is difficult as in (a), when the continuous wall shaped steel manufactured by the method of the present invention is used, it is possible to obtain a structure as shown in FIG.
As shown in (b), concrete can easily enter the joint. The female joint 1A is filled with the concrete that has entered from the female joint 1B by flowing in the longitudinal direction through the inner wall of the female joint. Moreover, since the cross-sectional shape from the female joint 1B to the female joint 1A smoothly changes like a funnel, the filling effect is great. Furthermore, since the female joint 1B projects from the web surface onto the fins, the effect of capturing concrete is large and the adhesion performance is excellent. Therefore, if such a continuous wall shaped steel is used, the composite structure with concrete is highly reliable and can be reliably constructed.

[0008] As a general method for producing a shaped steel for continuous walls, there is a conventional so-called caliber rolling method for straight type steel sheet piles shown in FIG. In this method, since the upper and lower horizontal rolls require a relatively deep and complicated hole shape and rolling is difficult, the shape of the straight type steel sheet pile is changed to a product shape that is easy to roll, and so-called universal rolling equipment for H-shaped steel is used. Using
Further, there is an improved method capable of rolling by means similar to the rolling method of H-section steel. Japanese Patent Publication No. 55-shown in FIG.
The method described in Japanese Patent No. 11921, and Japanese Patent Application Laid-Open No. Sho 5-5 shown in FIG.
The method described in JP-A-5-1913 and the method described in JP-A-4-84602 shown in FIG. 13 are examples, but in any method, a web having a constant cross-sectional shape is straight in the longitudinal direction. It is for producing a steel sheet pile of a mold, and it was impossible to roll a continuous wall shaped steel having a plurality of cross sections in the longitudinal direction, which is the object of the present invention.

[0009]

DISCLOSURE OF THE INVENTION The present invention, when producing a continuous wall shaped steel used for a composite structure with concrete by rolling, has a female joint cross section in the longitudinal direction which is desired according to the purpose of use. It is possible to continuously divide into multiple cross sections, and while fully sharing the existing continuous steel wall rolls for continuous walls, existing rolling mill rows are used as much as possible, and new installation and modification of equipment and guides are minimized. The purpose is to

[0010]

The gist of the present invention is as follows.

The steel billet material is formed into a dogbone-shaped rough shaped material by a breakdown mill, and the rough shaped material is subjected to an intermediate rolling mill including a universal mill and an edger mill so that the web portion has a predetermined thickness and a constant inner width. In addition, after forming an intermediate rolled material having a substantially H-shaped cross section in which the thickness and width of the flange portion are constant, and then bending the flange portion of the intermediate rolled material outward by a flange bending apparatus, the upper and lower ends of the finishing mill. In a rolling method of a continuous wall shaped steel for forming a female joint by finish bending forming a flange portion with a horizontal roll, a gap between upper and lower horizontal rolls is controlled during finish rolling in the finishing mill to obtain a roll hole type. Continuously characterized in that the joint height is continuously changed to produce a continuous wall shaped steel in which the opening width of the female joint portion is such that the narrow portion and the wide portion are alternately continuous in the length direction of the shaped steel. Rolling method for shaped steel for walls.

[0012] Vertical rolls having ridges formed on the roll peripheral surfaces are provided on both side surfaces of the upper and lower horizontal rolls of the finishing mill, and finish rolling is performed while the ridges of the vertical rolls are fitted between the upper and lower flange ends of the material to be rolled. The method for rolling a shaped steel for continuous walls described above.

[0013]

[Operations and Embodiments] Operations and embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which the present invention is applied to the production of shaped steels for vertically and horizontally symmetrical continuous walls, and FIG. 2 shows an example of arrangement of rolling devices for carrying out the method of the present invention.

The rough rolling step is a step in which a thin slab having a rectangular cross section or a dogbone-shaped steel slab is subjected to a plurality of edgings by upper and lower horizontal rolls of a breakdown mill BD to form a dogbone-shaped rough shaped material. is there. The breakdown mill is used in the rough rolling process of the section steel having the flange such as the conventional H section steel as described above, and a detailed description thereof will be omitted. Next, the intermediate rolling mill is composed of a rough universal mill U and an edger mill E. First, the rough shaping material is a hole type Ka of the rough universal mill U.
l. 3 is rolled and shaped into an intermediate rough rolled material 15a having a substantially H-shaped cross section. Here, horizontal roll 2 of universal mill U
As the rolls 0a and 20b, rolls having a flat surface for pressing the web surface of the intermediate rough rolled material 15a and a side surface abutting the inner surface of the flange having an outer inclination angle α are used. The outer inclination angle α is equivalent to that used for universal rolling of conventional H-section steel or I-section steel. On the other hand, vertical roll 30
As a and 30b, rolls for pressing the flange surface of the intermediate rough-rolled material 15a whose roll peripheral surface is formed to be substantially flat (hereinafter referred to as flat vertical rolls) are used. Flat vertical rolls used in universal mills can be used. That is, by using a flat vertical roll, the thickness of the joint portion of the shaped steel for continuous walls is formed in a so-called tapered thickness shape that is thick at the base and thin at the tip, and is an abacus ball used in general H-shaped steel rolling. Intermediate rough rolled material 1 that tends to occur when a vertical die roll is used
It is possible to prevent web deviation and flange thickness deviation of 5a.

Next, the intermediate rough-rolled material 15a rolled by the rough universal mill U has a hole shape Kal. The flange end portion is shaped by 3E and formed into the intermediate rolled material 15b having a predetermined flange width dimension. The horizontal rolls 21a, 21b, 21c and 21d of this edger mill E are disclosed in JP-A-62-1
It is the same as the shape of the horizontal roll in the conventional edger mill for manufacturing H-section steel with a constant flange width described in Japanese Patent No. 77107, etc., but positive rolling is not performed on the web surface of the intermediate rolled material 15b. a structure which can perform web thickness T _W horizontally even if the change rolls 21a, horizontal roll 21c while restraining the web end portions at 21b, 21d simultaneously the reduction of the flange tip portion at any position of the flange width direction Therefore, the flange width B can be set to a required value while preventing the web deviation. In this example, the intermediate rolling process is shown as a simple example in which one coarse universal mill U and one edger mill E are arranged to form a pair, but a plurality of pairs of rolling mills may be grouped as necessary. Is also good.

Next, the intermediate rolled material 15b having a substantially H-shaped cross section which is vertically and horizontally symmetrically rolled by the rough universal mill U and the edger mill E is bent and bent outward at the flange portion by the flange bending apparatus S, and the intermediate Finished rolled material 16
Is molded into. The horizontal rolls 22a and 22b of the flange bending apparatus S are hole type Kal. As shown by 2, curved body P for restraining the web of the intermediate finish rolled material 16 and curved concave portions P for performing bending forming on both ends in the width direction of the roll.
Are formed.

Subsequently, the intermediate finish rolled material 16 having the flange portion preformed and bent is finished by a finishing mill F into a final product 17 of a continuous wall shaped steel having joint portions having a plurality of cross-sectional shapes in the longitudinal direction. .. The roll hole types of the upper and lower horizontal rolls 23a and 23b of the finishing mill F are Kal. 1a, 1
b, a flange bending finishing hole die Ra for finish-forming the joint portion 18a (corresponding to the female joint 1A) and the joint portion 18b (corresponding to the female joint 1B) is formed. Here, FIG.
FIG. 1A shows a roll gap set state when finish-forming the joint portion 18a, and FIG. 1B shows a roll gap set state when finish-forming the joint portion 18b. In addition, Kal.
The upper and lower horizontal rolls 23a and 23b of the 1a and 1b are divided into left and right, but the Kal. It may be integrated as shown in FIG. In addition, Kal. 1a is composed of only horizontal rolls, but Kal. 1b is a vertical roll with ridges 40a, 40b
Are arranged on both side surfaces of the upper and lower horizontal rolls 23a and 23b, and the ridge portions 41a and 41b of the vertical rolls 40a and 40b with ridges are fitted between the upper and lower flange end portions (between joint end portions) of the material to be rolled, By limiting the width between the parts, the width and position of the opening of the female joint 1A that fits with the male joint of the female joint 18a of the final product 17 are accurately formed.

Horizontal roll 22 of flange bending apparatus S
a, 22b formed in the pore type Kal. Since the load and torque acting on 2 are very slight, when the universal mill U and the finishing mill F are continuous rolling, a flangeless bending apparatus S is provided on the rear surface of the edger mill E or the front surface of the finishing mill F and is a non-drive guide. It can also fully function as a roller. In addition, the horizontal rolls 23a and 23b of the finishing mill F have a hole type Kal. If 1a and 2 are excavated in parallel and the material is laterally shifted between the passes during rolling, it is not necessary to separately provide the flange bending apparatus S.

Hereinafter, by controlling the gap between the upper and lower horizontal rolls of the finishing mill in the longitudinal direction of the steel material to change the roll hole type joint height, the female joint portion has a continuous wall having a plurality of cross-sectional shapes in the longitudinal direction. The method for producing the structural steel will be described in detail.

FIGS. 3 (a) and 3 (b) are so-called roll flower diagrams showing the hole shape of the upper and lower horizontal rolls 23a, 23b of the finishing mill F and the shape of the steel material in correspondence with the roll gap set. The right half is shown. Figure 3 (a)
Is Kal. 1a, FIG. 3 (b) shows Kal. Corresponds to 1b. 23a-a and 23b-a show a state in which the joint portion 18a is bent and formed with the upper and lower horizontal roll gap sets of the finishing mill set to Sa, and 23a-b and 23b-b show joints with the upper and lower horizontal roll gap set of the finishing mill set to Sb. The state which shape | molds the part 18b is shown. Further, 23a-ab and 23b-ab are intermediate transitional joint portions 18 between the joint portions 18a and 18b, where the upper and lower horizontal roll gap sets of the finishing mill are Sab.
The state which molds ab is shown. The transitional joint portion 18ab has a shape in the process of changing the shape from the joint portion 18a to the joint portion 18b, and the drawings only show an example of the shape of the one process.

Next, FIG. 4 shows set values from the rolling top to the bottom of the roll gap set as a function of time. Here, FIG. 4A shows the case where the steel material top is started from the molding of the joint portion 18a, and FIG. 4B is the case where the steel material top is started from the molding of the joint portion 18b.

In the case of FIG. 4 (a), the top of the rolling keeps the rolling time tc in the roll gap Sa corresponding to the required rolling time of the cut-off length lc of the steel material tip. Next, female joint 1A
The rolling time ta is maintained in the roll gap Sa corresponding to the required rolling time of the length la in the longitudinal direction. After that, female joint 1A
From the female joint 1B through the transition time tab from the female joint 1B
The rolling time tb is maintained in the roll gap Sb corresponding to the required rolling time of the length lb in the longitudinal direction, and finally returns to the female joint 1A after the transition time tba from the female joint 1B to the female joint 1A. After that, until reaching the rolling bottom of steel (ta, S
a), (tab, Sab), (tb, Sb),
(Tba, Sba) roll gap control is automatically repeated. As described above, the roll gap set and the rolling time thereof are composed of four roll gap automatic control units (zones).
The I-th zone is a region for molding the female joint 1A, the II-th zone is a region where the cross-sectional shape is changed from the female joint 1A to the female joint 1B, and the III-th zone is a region for molding the female joint 1B.
The V zone is a region where the cross-sectional shape shifts from the female joint 1B to the female joint 1A. The roll gap set of 4 zones from I to IV and the distribution of the rolling time are as follows: (1) Female joint 1
Length distribution of A and 1B in the longitudinal direction is appropriate as a concrete composite structure, (2) Bending forming is properly performed, and (3) Mutual transition between the female joint 1A and the female joint 1B is a product surface flaw. It is decided to satisfy that it is smooth without biting or threading. Here, the roll gap S is corrected by the rolling load and the mill rigidity. Further, since the rolling time t is determined not only by the roll diameter but also by the advanced coefficient, even if the joint length l is constant, if the rolling conditions such as tension, rolling temperature, rolling material, etc. are changed, rolling can be performed even within the same rolling material. Since it changes from the top to the bottom, correct it accordingly. Specifically, the rolling load, rolling torque (electric power), and rolling temperature are measured over the entire length of the steel material, and based on the results, the appropriate roll gap set value S and rolling time t are calculated, and the finishing mill is leveled horizontally. Automatic roll-down control of the rolls 23a and 23b is performed. The specific means may be the online rolling AGC technology widely used in rolling mills, and detailed description thereof is omitted here. Since the contact area between the roll hole die and the steel material is small in the zone II to the zone IV, particularly in the zone III, the rolling is unstable and swings in the left-right direction, and the size and shape of the steel material fluctuates. Is likely to be bent. As a countermeasure against this, it is effective to use a guiding device according to Japanese Patent Application No. 2-237048, which penetrates the inside and outside of the die in the rolling direction.

If there is no problem on the product, as shown in FIG. 4 (b), the steel material top can be started by forming the joint portion 18b. That is, the top of the rolling keeps the rolling time tc with the roll gap Sb corresponding to the required rolling time of the cut-off length lc of the steel material tip. Then, through the III-th zone for molding the female joint 1B and the IV-th zone where the cross-sectional shape shifts from the female joint 1B to the female joint 1A, the roll gap control of 4 zones from I to IV is repeated periodically. Do it automatically. The method of FIG. 4B is more advantageous than that of FIG. 4A in terms of the biting property of the rolling top.

In FIG. 5, the lengths la and lb in the longitudinal direction of the female joint 1A and the female joint 1B are generally la = 100 to
It is 500 mm and lb = 500 to 1000 mm. The optimum values of the joint lengths la and lb are comprehensively determined according to the joint shape dimensions and construction conditions from the guideability / fitting strength of the continuous wall joint as a joint and the penetration of concrete into the joint fitting part. To be done. Therefore, depending on the design conditions of the continuous wall and the construction environment, the optimum la, lb for each construction project
However, according to the present invention, the joint lengths la and lb can be freely manufactured by automatic reduction adjustment. Here, the rolling speed is usually 4
By decelerating from 10 m / sec to 0.5-1.5 m / sec and performing the AGC automatic rolling reduction control, it is possible to secure dimensional accuracy of la and lb without major modification of the rolling mill of the existing rolling mill. You can

In the above example, the intermediate universal group is one group of U and E, but it may be a plurality of groups, and the method of the present invention can be applied to any factory where universal rolling of H-section steel is generally performed. it can. Further, in this embodiment, an example in which the present invention is applied to the technique described in Japanese Patent Application Laid-Open No. 4-84602 shown in FIG. 13 has been described. However, the conventional method for manufacturing a straight steel sheet pile shown in FIG. 55
The present invention can be applied to the technology described in Japanese Patent No. 11921, the technology described in Japanese Patent Application Laid-Open No. 55-1913 shown in FIG. 12 and the like in a similar manner.

[0027]

According to the method of the present invention, in the existing H-section steel universal rolling machine row, the female joint cross section of the continuous wall section steel can be continuously rolled in the longitudinal direction into a desired plurality of cross section shapes. Therefore, compared with other processing methods such as welding and gas cutting, it is possible to efficiently manufacture high-quality continuous wall shaped steel with a stable joint shape and good workability at a relatively low cost. It can respond to market needs quickly and accurately.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a rolling sequence according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a rolling process according to an embodiment of the present invention.

FIG. 3 is an explanatory view of a molding situation in the finish hole mold of the present invention.

FIG. 4 is an explanatory view of a finishing roll gap set of the present invention.

FIG. 5 is a schematic cross-sectional view for explaining the shape of the continuous wall shaped steel targeted by the present invention.

FIG. 6 is a schematic sectional view of a male joint that is a mating partner.

FIG. 7 is an explanatory view showing an example of use in which the shaped steel for a continuous wall manufactured by the present invention is formed as a box-type steel sheet pile.

FIG. 8 is a diagram showing a use state as a composite structure with concrete.

FIG. 9 is an explanatory diagram showing penetration of concrete into a joint portion.

FIG. 10 is an explanatory diagram showing a conventional method for rolling a vertically asymmetric left-right symmetrical linear steel sheet pile by a hole rolling method.

FIG. 11 is an explanatory diagram showing a conventional method of rolling a vertically symmetrical left-right asymmetric linear steel sheet pile by a universal rolling method.

FIG. 12 is an explanatory view showing a conventional method of rolling a vertical asymmetric left-right symmetrical linear steel sheet pile by a universal rolling method.

FIG. 13 is an explanatory view showing a conventional method for rolling a straight type steel sheet pile with vertical symmetry by a universal rolling method.

[Explanation of symbols]

 BD Breakdown mill U Universal mill E Edger mill S Flange bending machine F Finishing mill 1 Continuous wall shaped steel 1A, 1B Female joint 1W Web 2a Large H-shaped steel 2b Small H-shaped steel 3 H-shaped steel 4 Deformation prevention supplement Rigid material 5 Plate 6 Connecting member 15a Intermediate rough rolled material 15b Intermediate rolled material 16 Intermediate finish rolled material 17 Final product 20a, 20b Horizontal rolls 21a to 21d Horizontal rolls 22a, 22b Horizontal rolls 23a, 23b Horizontal rolls 30a, 30b Vertical rolls 40a , 40b Vertical roll with ridges 41a, 41b Ridge portion

Claims (2)

[Claims] 1. A billet-shaped rough shaped material is formed from a billet material by a breakdown mill, and the rough shaped material is an intermediate rolling mill consisting of a universal mill and an edger mill, and the web portion has a predetermined thickness and a constant inner width. Of an intermediate rolled material having a substantially H-shaped cross-section with a predetermined dimension and a constant thickness and width of the flange portion, and then the flange portion of the intermediate rolled material is outwardly curved by a flange bending apparatus, and then a finishing mill. In the rolling method of the continuous wall shaped steel for forming the female joint portion by finish bending forming the flange portion with the upper and lower horizontal rolls, the gap between the upper and lower horizontal rolls is controlled during the finish rolling in the finishing mill. Characterized in that the joint height of the mold is continuously changed to produce a continuous wall shaped steel in which the opening width of the female joint portion is such that the narrow portion and the wide portion are alternately continuous in the longitudinal direction of the shaped steel. Method for rolling continuous wall shaped steel. 2. A vertical roll having ridges formed on the circumferential surfaces of both sides of the upper and lower horizontal rolls of the finishing mill is provided, and the ridges of the vertical roll are fitted between the upper and lower flange ends of the material to be rolled for finishing. The method for rolling a shaped steel for continuous wall according to claim 1, characterized by rolling.