JPH07178410A - Shape steel for steel-made continuous wall and its production - Google Patents

Abstract

PURPOSE:To facilitate the working having high dimensional accuracy and stable quality, in which the smooth outer wall surface can be formed, by arranging joint parts having a smooth web part and specific asymmetrical shapes at the right and the left sides. CONSTITUTION:This shape steel is provided with a linear web part 31 having almost the smooth surface 32 at least at the one side and a first joint part 33 formed with an opening part 34 at the inside by bending as arc state inward after bending by almost 90 deg. to the reverse side of the flatened surface 32 at the one end of this web part 31. Successively, the other end of the web part 31 is extended almost to parallel with the web part 31 through arc state after bending by almost 90 4-, as linear in the same direction of the first joint part 33 and then, a second joint part 35 formed with an opening part opened to inside is constituted after bending by almost 90 deg. as linear to the web part 31 side. In this way, as the special shape having asymmetrical shape at the right and the left sides is formed, the separated joint as the conventional method is unnecessary and the shape steel for continuous wall can directly be connected with the same shape steel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel section wall steel used as a member for retaining soil and a method for manufacturing the same, and more particularly, to a left and right side so that a smooth surface can be formed during construction. For steel connecting walls, where asymmetric joints are located on one side of the web that is a smooth surface, for steel connecting walls, which are manufactured by using conventional rolling equipment such as H-shaped steel as much as possible. The present invention relates to a shaped steel and a manufacturing method thereof.

[0002]

2. Description of the Related Art Steel connecting walls are steel underground connecting members that are built in the ground to form underground connecting walls. Compared to conventional reinforced concrete underground walls. It is possible to reduce the wall thickness, reduce the construction site space, and save labor. Further, it has excellent characteristics such as a good installation accuracy and water-stopping property as compared with a normal H-section steel installation.

As the above-mentioned steel section steel for wall connection, a straight section steel having a joint portion is generally used. As an example of a method for producing a straight section steel having a joint, Japanese Patent Publication No.
There is a caliber (hole type) rolling method described in JP-A-5-11921. In this rolling method, as shown in FIG. 8, rough shaped steel pieces that have passed through the hole forming B in the roughing step are sequentially subjected to the first pass ka.
A product is obtained through each of the steps from 110 to 10th pass kal1.

However, in such a rolling method, the depth of the die of the rolling roll is large, and especially in the closed die, the amount of roll modification is large due to the wear of the die, and therefore,
The basic unit becomes higher. In addition, since the roll cooling water and rolling oil do not easily spread to each part, roll surface roughness, heat tracks, local wear of the hole type, cracks in the fitting joints at both ends of the product, etc. easily occur, and the product shape is unstable. It is difficult to mass-produce, and it is relatively difficult to mold the joint part.
There are various problems. Also, since many hole types are required,
Even if an attempt is made to roll a large-sized steel section wall for connecting walls, there is a problem that a sufficient number of hole dies cannot be prepared due to restrictions such as the roll cylinder length and the number of rolling mills.

In contrast to the hole type caliber rolling method as described above, a method for manufacturing a steel sheet pile by a universal mill which eliminates the forming defects by directly rolling down the material forming the joint portion is special. Kosho 47-47784
It is disclosed in the publication. In the present invention, as shown in FIG. 9, a universal mill k is introduced in the intermediate rolling process to directly apply reduction to the joint portion. However, even in this rolling method, since the upper and lower horizontal rolls are required to have a relatively deep and complicated hole shape, the above problems cannot be solved.

Further, as a method for producing a linear steel sheet pile by making the product shape suitable for the universal rolling method and reducing the hole depth in the universal mill.
There is an invention disclosed in Japanese Patent Laid-Open No. 1913. As shown in FIG. 10, the present invention has a problem in that all the shapes of the universal mill roll are arcuate, so that the web thickness and joint portion thickness are limited to a narrow range.

Further, Japanese Patent Publication No. 55-11921 discloses a method for manufacturing a straight type steel sheet pile having a special joint shape by a similar universal rolling method. However, these straight type steel sheet piles are required to have a smooth surface. It cannot be used for objects, and it is disclosed in JP-A-2-200302 and JP-A-4200302.
In both of the inventions disclosed in JP-A-75702 and JP-A-4-330113, it can be said that the invention is impossible.

As a method for producing a straight section steel having a smooth surface, Japanese Patent Laid-Open Nos. 4-182002 and 5-711 are known.
There is an invention disclosed in Japanese Patent No. 21. As shown in FIG. 11, the former linear shaped steel has male pawls 52, 52 that are inclined and bent inward on one side of both ends of a web 51 having a smooth surface.
The male claws 52, 52 of the adjacent straight shaped steels 50, 50 are connected by the inward joint 53. In the latter linear shaped steel, as shown in FIG. 12, curved portions 54, 54 curved inward are formed on one side of both ends of a web 51 having a smooth surface, and adjacent linear shaped steels are formed. The curved portions 54, 54 of 50, 50 are connected by an arcuate joint 55.

Further, as shown in FIG. 13, the linear shaped steel disclosed in Japanese Patent Application Laid-Open No. 4-306312 has a straight line extending in the same line as the web 51 at both ends of the web 51 having a smooth surface. Has a joint part 58 composed of an upper claw 57 having a portion and a curved lower claw 58 provided below the upper claw 57, and the joint parts 58, 58 of the adjacent linear shaped steels 50, 50.
Are connected by a joint 59.

Further, as shown in FIG. 14, the linear shaped steel disclosed in Japanese Unexamined Patent Publication No. 4-182003 has a first straight type having male joint portions 60 at both ends of a web 51 having a smooth surface. Second straight shaped steel 50 having shaped steel 50a and female joint portions 61 at both ends of a web 51 having a smooth surface.
b, and adjacent first and second straight section steels 50a,
The male joint portion 60 is fitted and connected to the female joint portion 61 of 50b.

[0011]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The linear shape steels disclosed in Japanese Patent Laid-Open No. 2002, Japanese Patent Laid-Open No. 5-71121 and Japanese Patent Laid-Open No. 4-306312,
If these are connected in the lateral direction, a separate joint is required in each case, which not only makes the construction troublesome but also increases the construction cost.

Further, in the straight section steel disclosed in Japanese Unexamined Patent Publication No. 4-182003, a joint is not required because adjacent straight section steels are directly connected by a joint section, but the structure of the joint section. It is necessary to manufacture two types of shaped steels having different shapes. For this reason, since it is necessary to prepare two types of all rolls including the roll of the breakdown mill, an increase in manufacturing cost is inevitable.

As described above, in the past, as the steel wall section steel, there has been mainly a vertical or left-right symmetrical shape or an asymmetrical shape having a male joint on one side, and a case where a smooth surface is required in terms of structure. Shaped steels that can be used for are connected by a joint prepared separately, or two kinds of shaped steels of different shapes are prepared,
Since the joint portions were fitted and connected, there were various problems such as the troublesome construction and the increase in cost as described above.

The present invention has been made to solve the above-mentioned problems, and has a high dimensional accuracy, stable quality, easy construction, and an inexpensive asymmetric web having a smooth web. The purpose of the present invention is to obtain a shaped steel for connecting walls and a manufacturing method thereof.

[0015]

SUMMARY OF THE INVENTION A steel section wall for steel according to the present invention is a substantially smooth web and is bent in the same direction on one side of both ends of the web to open inward. And an asymmetric joint portion having a portion.

Further, in the method for manufacturing a steel section wall for steel according to the present invention, both sides of a portion corresponding to a web are diagonally bent by a break down mill using a steel slab such as a slab as a raw material, and its corners are bent. A process of manufacturing a rough-molded material with corner-cut taper formed at the corners and a step for forming the web part and joint part with the universal mill and the edger are performed on the rough-molded material manufactured in this process. In addition to rolling, the flat part provided at the center of the vertical roll forms a surplus in the part corresponding to the corner of the joint,
The step of rolling to almost the product plate thickness, and the rolling material rolled in this step are sequentially shaped by the other die except the final forming die of the finishing mill so that the step is at the same position as the product step. Then, the steps of rolling both joint parts into a curved shape and then forming them in the final forming hole die.

[0017]

The steel section wall for steel wall according to the present invention is a box-shaped sheet pile having a substantially H-shaped cross section in which the joint portions of two section steels are arranged so as to face each other and the plates are welded between the webs. used.
In construction, the joints of adjacent box-shaped steel sheet piles are combined and connected. At this time, smooth portions are continuously formed on both outer walls of the connected steel connecting walls to be substantially flat.

Further, the method for manufacturing the steel section wall for steel wall according to the present invention is performed by the following steps. (1) As shown in FIG. 5, in the first step, a continuous cast steel piece SL such as a slab is used as a material for rolling, and a hole type kal. A ~
kal. Since both sides of the portion corresponding to the web are bent diagonally by N, and the corner portions 11 and 12 of the material do not cause edge protrusions etc. by the universal mill U ₁ in the next first intermediate rolling, the corner cutting is performed. The roughly shaped material FBB having a taper shape is rolled by a breakdown mill BD.

(2) In the second step, the universal mill U ₁ which is the first intermediate rolling using the same rolls as in the production of the H-section steel, and the reduction setting so that the predetermined flange height is obtained are performed at the same time. In order to prevent the corners from protruding at the corners that tend to occur during universal rolling, the corners of the material 13,1
The intermediate shaping rolling of the rough shaping material FBB is performed by using the edger E ₁ which can be shaped by tapering the No. ₄ and.

(3) In the third step, rolling is carried out by the universal mill U ₂ which is the second intermediate rolling until the plate thickness becomes approximately the product thickness. The lower horizontal roll 20L is given the shape of the concave portion 16 and is rolled to make a step from the web to a portion corresponding to the product joint portion. Also, when making this step,
A surplus portion 17 is formed on the upper horizontal roll 20U in order not to cause chipping or the like when the step is further increased by the finishing mill F which is the next rolling.

(4) The vertical rolls 20VF and 20VD used in pairs with the upper and lower horizontal rolls 20U and 20L at the time of rolling by the universal mill U ₂ have a shape having a flat portion at the roll center. Corner of joint 1
8 and 19 are provided with extra thickness so that the shape is close to the product (see the enlarged views of FIGS. 6A and 6B).

(5) Edger E in the second intermediate rolling
₂ has basically the same action as the edger E ₁ at the time of the first intermediate rolling, but in addition, the upper and lower horizontal rolls 21U and 21U, so that the step of the web in the universal mill U ₂ can be formed at the same time. 21L is provided with step shape 20 and shape 21 and extra thickness shape 22 as with the upper and lower horizontal rolls 20U and 20L of the universal mill U ₂ .

(6) In the second intermediate rolling, when the web is rolled to a predetermined plate thickness while providing a step, the degree of deformation is large in one pass, and the rolling balance is apt to be disturbed, which causes the entire deformation. Since rolling and bending are likely to occur, rolling is performed so as to sequentially form a plurality of passes of about 3 to 7 passes.

(7) In the fourth step, the left and right asymmetrical shaping hole mold kal. 30-kal. The finishing mill F having 50 rolls the second intermediate rolled material. At that time, the 1st pass modeling hole type kal. 30 and 2nd pass modeling hole type kal. In 40, in order to position the stepped portion of the web formed by the second intermediate rolling further downward, the web is formed by the upper and lower rolls 24, 25 and 26, 27 while pressing down the excess thickness portion 23. In addition, the second pass modeling hole type kal. The upper roll 40U and the lower roll 40L of 40 have curved shapes 28, 2 in order to facilitate bending of the bent portion of the joint portion during final molding.
9 is formed.

(8) Finishing mill F, 3rd pass shaping hole die k
al. In 50, upper and lower rolls 50U and 50L
To reduce the final shape (product shape).
Through the above steps, a steel section wall steel having a smooth portion as shown in FIG. 1 is manufactured.

[0026]

FIG. 1 is a top view of an embodiment of a steel section wall steel for a wall according to the present invention. The steel wall section steel 30 according to the present invention,
A linear web 31 having a substantially smooth surface 32 on at least one side, and one end of the web 31 having a smooth surface 32
And a first joint portion 33 in which an opening 34 that is bent inward in an arc shape is formed on the opposite side of the first joint portion 33. Joint part 3
After being bent linearly in the same direction as that of 3 by approximately 90 °, it is extended outward substantially parallel to the web 31 through the arc portion, and then,
The second joint portion 35 is formed by linearly bending the web 31 side by approximately 90 ° and then bending the same in an arc shape to form an opening portion 36 that opens inward. Thus, the first,
The second joint portions 33 and 35 are formed asymmetrically, and both are provided on one side of the web 31.

As shown in FIG. 2, for example, as shown in FIG. 2, the steel wall section steel 30 as described above has two section steels 30 and 30 in which the first joint portion 33 and the second joint portion 35 face each other. And the plate 37 is welded to the webs 31, 31,
A box-shaped steel sheet pile 40 having a cross section is configured. In the case of FIG. 3, the first joint portion 33, 33, the second joint portion 35,
The plates 35 are arranged so that they face each other, and the plates 37 are welded.

The box-shaped steel sheet pile 40 having the above-described structure is used, for example, as shown in FIG.
The first joint portions 33, 33 of the next box-shaped steel sheet pile 40a are fitted into the openings 36, 36 of the second joint portions 35, 35 of No. 0 and driven into the soil. Next, the first joint portions 33, 33 of the next box-shaped steel sheet pile 40b are fitted into the second joint portions 35, 35 of the box-shaped steel sheet pile 40a and driven into the soil.

As described above, in the present invention, the connecting wall can be built by simply connecting the adjacent joint portions without fitting any special joints and connecting them. At this time, both outer walls of the connecting wall are formed to be substantially smooth.

FIG. 5 is an explanatory view of an example of a method for producing a steel section wall for steel according to the present invention, and FIG. 7 is an explanatory view showing an outline of the rolling apparatus row. In both figures, in the rough rolling step, the break down mill B is made by using the continuously cast steel piece SL such as a slab as a material.
D first pass hole type kal. A-final pore type kal. It is a step of modeling the rough modeling material FBB with N. As the hole type to be used, the material is diagonally bent at the part corresponding to the product joint part, the necessary web height L and flange heights H ₁ and H ₂ are secured, and each part plate from the overall pass schedule is used. A rough shaping material (universal rolling material) FB that has a shape that balances the thickness and is rolled multiple times by three to five pairs of hole types and sent to the next first intermediate rolling step.
Shape B.

During the above rolling, the corner portions 11, 12 of the material are rolled.
In the first intermediate rolling, a corner-tapered taper is applied in order to prevent the occurrence of ears or the like by the universal mill U ₁ in the first intermediate rolling.

The rough shaped material FBB rolled by the breakdown mill BD is rolled in the first intermediate rolling section of the second step. Horizontal rolls 10U, 10L and vertical rolls 10UF, 10UD of the universal mill U ₁ for the first intermediate rolling
Can commonly use a roll for rolling a conventional H-section steel. Horizontal rolls 11U, 11 above and below the edger E ₁ used in pair with the universal mill U ₁ during the first intermediate rolling
L is a corner portion 13 of the material of both rolls 11U, 11L,
A universal mill U with a taper on the part
By preventing earing which is likely to occur during rolling by ₁ , it is possible to roll and model an intermediate rolled material having sound corner portions 13 and 14 without folding.

Next, in the universal mill U ₂ which performs the second intermediate rolling which is the third step, rolling is performed in a plurality of passes until the product sheet thickness is almost reached, but the convex portion 15 is formed on the upper horizontal roll 20U. Then, the lower horizontal roll 20L is provided with the recess 16 and rolling is performed so that a portion corresponding to the product joint portion is provided with a step from the web. If this step is performed only by the second intermediate rolling to the same position as the product, the biting posture will be greatly different between the left and right, and it will be difficult to balance the rolling reduction, resulting in bending and twisting. It will be easier.

Therefore, the step height in the second intermediate rolling is 1/2 to 1/1 / the height from the web of the product to the step portion.
It is set to about 3, and the remaining height is pushed down by the next finishing mill F to form. As a result, stable rolling work can be performed, and good results can be obtained in terms of quality.

In this case, the degree of deformation is large in one pass, and the rolling balance is likely to be disturbed thereby, and the entire deformation and bending are likely to occur, so that a plurality of passes of about 3 to 7 are sequentially performed. It is desirable to mold.

The upper and lower horizontal rolls 20U, 20L and the left and right vertical rolls 2 of the universal mill U ₂ during the second intermediate rolling
The angles 0VF and 20VD are equal to those of the conventional H-section steel rolling rolls, and the turning of the rolls due to wear or the like can be performed without any change. The vertical rolls 20VF and 20VD have a flat portion formed in the roll center portion, so that the corner portions 18 and 19 of the rolled material have enlarged views of FIGS. 6 (a) and 6 (b). As shown in (3), the excess thickness portion is formed, the water resistance of the product is improved, and the fitting portion can be prevented from coming off due to rotation or the like during construction.

Next, in the fourth step, rolling from the shaping to the final shaping is performed by the finishing mill F having the asymmetrical hole shape. The hole type used here also adjusts the web thickness, but its main role is to increase the height of the step formed by the second intermediate rolling and the final forming of the joint part. Are sequentially rolled to form.

When the height of the step portion is enlarged, the first pass forming hole type kal. 30 and 2nd pass modeling hole type kal. 40
Thus, the extra thickness portion 23 is pressed down and pushed down to the step forming portions 24, 25 and 26, 27 of each roll, so that the roll can be enlarged without difficulty. Further, the second pass modeling hole type kal. By providing the curved portions 28 and 29 in the portion corresponding to the joint portion of 40, the final forming hole mold ka
l. At the time of the final molding by 50, the joint part can be bent and molded with high accuracy and without causing defects or the like.

In the above embodiment, two rolling mills for the first intermediate rolling and the second intermediate rolling are arranged, one for each of the universal mills U ₁ and U ₂ and the edgers E ₁ and E _2. Although shown, in a rolling line capable of arranging three or more sets of rolling mills, it is possible to sequentially perform reduction adjustment of each plate thickness and step formation from the web of the joint portion. The number of passes can be dispersed, and the production can be performed more efficiently. In the above embodiment, the edgers E ₁ and E ₂ are connected to the universal mills U ₁ and U 2.
_Although the case where it is installed on the delivery side of ₂ is shown, the edgers E ₁ and E _{1 of} the first intermediate rolling and / or the second intermediate rolling
₂ may be installed on the inlet side of the universal mills U ₁ and U ₂ .

Although the finishing mill has three pairs of hole types, four or five pairs of hole types may be arranged in parallel or in superposition if necessary, or used in addition to the finishing mill. If you have a rolling mill with possible upper and lower horizontal rolls,
The holes may be dispersed and arranged in two or more rolling mills. As a result, it is possible to manufacture a shaped steel of good quality even if the plate thickness or shape is changed.

Through the steps described above, the steel section wall steel for connecting walls as shown in FIG. 1 can be smoothly produced. The size of the web thickness T _w of this shaped steel is mainly classified into the first
It is carried out by adjusting the upper and lower horizontal rolls 10U and 10L of the universal mill U ₁ at the time of intermediate rolling, and the joint portion thickness T _a is the left and right vertical rolls 10V at the time of rolling.
It is performed by adjusting the reduction of F and 10VD. According to such a process, the features of the universal mill are produced, and at least the first
It is possible to manufacture products with various plate thicknesses without changing rolls until intermediate rolling.

[0042]

EFFECTS OF THE INVENTION As is clear from the above description, the steel shaped steel for wall connecting walls according to the present invention has a left and right asymmetrical joint portion having a special shape on one side of both ends of a substantially smooth web. Since it is provided, it is not necessary to separately provide a joint or to manufacture two types of steels for steel wall with different shapes as in the conventional case, and it is possible to directly connect the steel shaped steels for wall with each other. Therefore, the mating,
It is extremely easy to connect, and since both outer wall surfaces of the connecting wall constructed by connecting are smooth web surfaces, it is possible to form a smooth outer wall surface and obtain a structure with excellent aesthetics. You can Further, in construction, it is advantageous in terms of attachment of members and the like and work, and the cost can be reduced.

Further, the manufacturing method of the steel section wall steel for wall according to the present invention does not require special rolling by using the break down mill or the universal mill whose plate thickness can be easily adjusted, and therefore the manufacturing cost can be reduced. It is possible to stably produce high-quality steel wall-shaped steel section steel because not only is it possible to reduce the production cost, but also there is no need to perform special work during rolling.

[Brief description of drawings]

FIG. 1 is a top view of a steel section wall for steel wall according to the present invention.

FIG. 2 is a plan view of an example of use of the shaped steel for steel wall according to the present invention.

FIG. 3 is a plan view of a usage example of the steel section wall for steel wall according to the present invention.

FIG. 4 is an explanatory view of a construction example of the steel section wall for steel wall according to the present invention.

FIG. 5 is an explanatory view for explaining an example of a method for manufacturing a steel section wall steel for steel wall according to the present invention.

6 (a) and 6 (b) are enlarged views of a main part of FIG.

FIG. 7 is an explanatory diagram showing an outline of a rolling apparatus train corresponding to the manufacturing method of FIG.

FIG. 8 is an explanatory diagram showing an example of a conventional method for manufacturing a steel section wall for steel wall.

FIG. 9 is an explanatory view showing an example of a conventional method for manufacturing a steel section wall for steel wall.

FIG. 10 is an explanatory view showing an example of a conventional method for producing a steel section wall for steel wall.

FIG. 11 is an explanatory view showing an example of construction of a conventional straight section steel.

FIG. 12 is an explanatory view showing an example of construction of a conventional straight section steel.

FIG. 13 is an explanatory view showing an example of construction of a conventional linear shaped steel.

FIG. 14 is an explanatory diagram showing an example of construction of a conventional straight section steel.

[Explanation of Codes] 30 Steel Shaped Steel for Wall Wall 31 Web 32 Smooth Section 33 First Joint Section 35 Second Joint Section 34, 36 Opening BD Breakdown Mill R ₁ 1st Intermediate Rolling Mill Group R ₂ 2 Intermediate rolling mill group U ₁ , U ₂ Universal mill E ₁ , E ₂ Edger F Finishing mill

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuro Udagawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.

Claims (2)

[Claims] 1. A steel section wall steel for steel wall, which comprises a substantially smooth web and an asymmetric joint part which is bent in the same direction at one end of each end of the web and has an opening inside. . 2. A roughly shaped material in which a slab or other steel slab is used as a raw material and both sides of a portion corresponding to a web are diagonally bent by a break down mill, and a corner-cut taper is formed at each corner. The process of manufacturing, and the rough shaped material manufactured in the process are rolled by a universal mill and an edger with a step for forming a web part and a joint part, and a flat part provided in the center part of the vertical roll. Part to form a surplus part in a portion corresponding to a corner of the joint part, and rolling to a product plate thickness, and the rolled material rolled in the step is formed into a final forming die for a finishing mill. Except for the other hole dies, the step is sequentially modeled so that the step is at the same position as the product step, and then both joints are rolled into a curved shape, and then the final forming hole is formed. Shaped steel Manufacturing method.