JPH0994614A - Roller straightening method for u shaped steel sheet pile having arm part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the straightening precision of an arm part without impairing a sheet pile cross-sectional shape by making an upper roller/lower roller to restrict the web part, the flange part and the arm part from the up/ down direction in the integrated form when a steel sheet pile having the arm part between the joint and flange is subjected to roller straightening. SOLUTION: When the web part 30, flange part 32, arm part 34 and joint part 35 are assembled to a roller, while integrated upper rollers 36, 36 and lower rollers 38, 38 further an outside roller 40 restrict the web part, the flange part as well as the arm part 34, the three point supporting repeating bending stress is applied with the upper/lower rollers so as to straighten. When the angle between the arm part 34 and flange part 32 is different from the angle of the final product, by providing a taper to restricting parts 36, 38 of the arm part 34 of upper/lower rollers and executing the repeating bending straightening, a work is straightened to the same angle as the product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller straightening method for U-shaped steel sheet piles used in, for example, civil engineering and construction, particularly U-shaped steel sheet piles having an arm portion between a flange portion and a joint portion. Is.

[0002]

2. Description of the Related Art As a roller straightening method for U-shaped steel sheet piles,
Even in the past, some proposals have been made, for example, in Japanese Patent Laid-Open No. 61-63316, a pair of upper and lower straightening rollers having a straightening portion for sandwiching a web portion and a flange portion of a U-shaped steel sheet pile. It has been proposed to provide joint restraint portions for restraining the joint portion of the U-shaped steel sheet pile adjacent to both sides of the straightening portion of the upper straightening roller. A similar proposal is also made in JP-A-55-70418. However, in such a conventional technique, the following problems remain unsolved.

That is, as shown in FIG. 1, a straightening roller 10 for a U-shaped steel sheet pile has a web portion 12, a flange portion 14, and a joint portion.
It is designed so that the outer side of the joint 16 can be corrected by bending straightening by repeating bending up and down and left and right while the roller 18 that restrains the outer side of the joint portion 16 adjusts the overall width of the product. As described above, since the bending is straightened while restraining the web portion and the flange portion, the cross-sectional shape of the product is straightened without being deformed.

[0004]

However, as shown in FIG. 2, in the case of a U-shaped steel sheet pile having an arm portion 20 between a joint portion 16 and a flange portion 14, when performing straightening while repeatedly bending. Since the arm portion 20 is not constrained, the arm portion 20 is free to plastically deform at the base of the flange portion 14, and finally the angle between the flange portion and the joint portion is different from the intended product cross section. It turns out that it will end up. The purpose of the present invention is
It is an object of the present invention to provide a roller straightening method capable of straightening a U-shaped steel sheet pile having an arm portion without deforming the sectional shape when straightening the roller.

[0005]

Means for Solving the Problems The inventors of the present invention have made various studies on problems in straightening a U-shaped steel sheet pile having an arm portion on a roller, and merely restrain the cross section of the web portion and the flange portion entirely. However, as a result of repeated studies, it is preferable to make the cross-section restraint including the arm part, and preferably to make the rollers for restraining the web part, the flange part, and the arm part both upper and lower to be integrated. The present invention has been completed by finding that such arm correction can be performed accurately.

The present invention provides a roller straightening method for a U-shaped steel sheet pile, which comprises a web portion, a flange portion, and a joint portion, and has an arm portion between the joint portion and the flange portion, in addition to the web portion and the flange portion. A roller straightening method for a U-shaped steel sheet pile having an arm portion, characterized in that a straightening roller in which upper and lower rollers for restraining the arm portion from above and below are integrated is used.

According to a preferred embodiment of the present invention, when restraining the arm portion between the flange portion and the joint portion, a straightening roller for restraining the arm portion from above and below at an angle different from the product cross section is used. As described above, according to the present invention, the straightening roller for straightening the U-shaped steel sheet pile having the arm portion by repeatedly bending the U-shaped steel sheet pile up and down and right and left is a roller for restraining the upper side of the U-shaped steel sheet pile and a lower side thereof. Each of the web portion, the flange portion, and the arm portion is constrained by an integral roller in the vertical direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is an explanatory view showing the incorporation of a straightening roller of a U-shaped steel sheet pile having an arm as an example of a straightening roller according to the present invention. In the figure, a U-shaped steel sheet pile having a web portion 30, a flange portion 32, an arm portion 34 and a joint portion 35 is formed on the web portion and the flange portion by the upper rollers 36 and 36, the lower rollers 38 and 38, and the outer roller 40. In addition, the arms are restrained.

When the angle between the arm portion 34 and the flange portion 32 before straightening is different from that of the final product, the rollers 36 and 38 for restraining the arm portion 34 are tapered to repeatedly bend and straighten the product. You may correct so that it may become a similar angle.

FIG. 4 is a schematic view showing a U-shaped steel sheet pile straightening roller having an arm as an example of the straightening roller according to the present invention in such a case. Compared to the case of FIG. 3, the roller 36,
The difference is that each of the 38 has a taper of an angle α.

In any case, a straightening roller for restraining the arm portion from the up and down direction is used in addition to the web portion and the flange portion. Especially, in the case of FIG. 4, the arm portion between the flange portion and the joint portion is used. When constraining, a straightening roller is used that constrains it from the vertical direction at an angle different from the product cross section.

In the illustrated example, the upper and lower rollers 36, 38 are shown as integrated with each other, but they may be divided. Here, the principle that the roller straightening is effectively performed by such a constraint will be described as follows.

That is, as is well known in the prior art, repeated straightening is performed by three-point support by the upper and lower rollers, but consider the case where the fulcrum is on the lower roller and the force point is on the upper roller. As shown in FIG. 5, when the arm portion 34 is unrestrained, the angle θ formed by the arm portion 34 and the flange portion 32 is deformed in a direction in which the angle θ decreases. That is, in the figure, the arm portion 34 is deformed in the arrow direction. On the other hand, the cross-sectional shape when constrained is maintained without being deformed.

When the fulcrum is on the upper roller and the force point is on the lower roller, as shown in FIG.
When is not restrained, the angle θ formed by the arm portion 34 and the flange portion 36 is deformed in the increasing direction. That is, in the figure, the arm portion 34 is deformed in the arrow direction. On the other hand, the cross-sectional shape when constrained is maintained without being deformed.

Therefore, as in the present invention, by restraining the arm portion together with the web portion and the flange portion, preferably by the integral roller, the product cross-sectional shape is impaired as in the case of FIGS. 5 and 6 described above. Can be corrected without. In addition, even though the bending of the U-shaped steel sheet pile having no arm portion has been conventionally performed by restraining the web and the flange portion, compared with that of the present invention, there are the following differences in principle. Be looked at. That is, according to the present invention, as compared with a U-shaped steel sheet pile having no arm portion, the U-shaped steel sheet pile having an arm portion having high rigidity against bending is constrained by a roll in its entire cross-section except for the joint portion, Vertical and horizontal bends can be easily removed.

[0016]

EXAMPLES Next, the effects of the present invention will be specifically described by way of examples. Example 1 The cross section and overall shape of the test material sample used in this example are shown in FIG. 7, and the specifications were as follows.

Sample length (L): 15.3 m Vertical bending amount: Deflection 10 mm / 15.3 m Total width (W): 640 mm In order to confirm the effect of the present invention, only the web portion and the flange portion shown in FIG. The cross-sectional shape after bending and straightening was investigated between the case where the conventional straightening roller for restraining was used and the case where the straightening roller according to the present invention for restraining the arm part by the upper and lower rollers was used as shown in FIG.

When the web portion, the flange portion, and the arm portion of the upper roller are restrained by different rollers, the boundary portion between the web portion and the flange portion and the boundary portion between the flange portion and the arm portion may be restrained by the rollers. As such, such a non-integral roller did not have a sufficient straightening effect. 8 and 9 show the relationship between the angle of the flange portion and the arm portion in the longitudinal direction, and FIG. 10 shows the relationship between the total width fluctuation amounts in the longitudinal direction.

FIG. 8 is a graph showing the variation (Δθ) of the angle (θ) between the horizontal plane and the arm with respect to the length of the test material in the longitudinal direction. It can be seen that in the case of the example, it is almost constant regardless of the distance in the longitudinal direction. FIG. 9 is a graph showing a relationship similar to that of FIG. 8 in another arm portion, and as shown by ▲, in this case as well, substantially no angular variation (Δθ) is observed in the present invention.

FIG. 10 is a graph comparing the amount of variation in the width of the U-shaped steel sheet pile, and even in this case, there is substantially no variation in the present invention. Thus, according to the present invention,
Compared with the conventional method, the angle between the flange portion and the arm portion, and the size of the entire width are almost unchanged, and good results are obtained.

(Embodiment 2) In this embodiment, the straightening roller according to the present invention shown in FIG. 3 is used and the straightening roller shown in FIG. 4 is tapered (taper angle 3 °). It was investigated whether or not there is a difference in the subsequent cross-sectional shape.

The relationship between the horizontal plane and the angle of the arm portion in the longitudinal direction is shown in FIGS. 11 and 12, and the relationship in the total width variation in the longitudinal direction is shown in FIG. The specifications in this example were as follows. Sample length (L): 15.3m Vertical bending amount: Deflection 10mm / 15.3m Full width (W): 640mm

[0023]

In the roller straightening of the U-shaped steel sheet pile having the arm portion using the straightening roller of the present invention, the roller straightening can be performed without changing the sectional shape (full width, angle between the flange portion and the arm portion). .

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional straightening roller incorporated into a U-shaped steel sheet pile.

FIG. 2 is an explanatory diagram of a conventional straightening roller built-in for a U-shaped steel sheet pile having an arm portion.

FIG. 3 is an explanatory view of incorporation of a straightening roller according to the present invention into a U-shaped steel sheet pile having arms.

FIG. 4 is an explanatory view of a straightening roller of a U-shaped steel sheet pile having arms according to the present invention.

FIG. 5 is a cross-sectional shape (No. 1) when the roller is straightened.

FIG. 6 is a sectional view (No. 2) when the roller is straightened.

FIG. 7 is a perspective view of a test material sample.

[Fig. 8] Relation between the angle of the flange and the arm in the longitudinal direction
It is a graph which shows (left side).

FIG. 9: Relationship between the angle of the flange and the arm in the longitudinal direction
It is a graph which shows (right side).

FIG. 10 is a graph showing the total width variation in the longitudinal direction.

FIG. 11 is a relationship between the angle between the flange and the arm in the longitudinal direction.
It is a graph which shows (left side).

FIG. 12 is a relationship between the angle of the flange portion and the arm portion in the longitudinal direction.
It is a graph which shows (right side).

FIG. 13 is a graph showing the total width variation in the longitudinal direction.

Claims (2)

[Claims] 1. A roller straightening method for a U-shaped steel sheet pile comprising a web portion, a flange portion, and a joint portion, and having an arm portion between the joint portion and the flange portion. A roller straightening method for U-shaped steel sheet pile having an arm portion, characterized in that a straightening roller in which upper and lower rollers restrained from each other are integrated is used. 2. The roller straightening method according to claim 1, wherein, when restraining an arm portion between the flange portion and the joint portion, a straightening roller which restrains the arm portion from above and below at an angle different from a product cross section is used. A method for straightening a roller of a U-shaped steel sheet pile having an arm portion characterized by: