JPH0428045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention provides a corner U with joints at both ends.
This invention relates to a shaped steel sheet pile and its manufacturing method.

(Prior art and its problems) In civil engineering work such as earth retaining, rows of U-shaped steel sheet piles with Ralzen type joints are driven in succession alternately to create sheet pile rows, but as shown in Fig. 8, corner In this section, because dimension a extends over multiple branches due to construction work, irregularly shaped steel sheet piles 50 and 51 are used. These deformed steel sheet piles 50 and 51 are made by gas cutting the web of a regular U-shaped steel sheet pile 52 and dividing it into two.
The structure is such that they are connected by bolts 54 via angle members 53 or by welding.

Therefore, the following problems arise.

(i) It is complicated to create a different shape of the thrust in response to a change in dimension a, and this can be done with only two types, A and B in Fig. 8.

(ii) During manufacturing, after gas cutting, bolt tightening,
Alternatively, since welding is performed, the cost is high and work such as strain relief after welding is complicated.

This invention was proposed to solve these problems, and its purpose is to easily supply JAST deformed steel sheet piles to the a dimension of the corner part, and to reduce processing costs. The object of the present invention is to provide a deformed steel sheet pile that can be produced and a method for manufacturing the same.

(Means and effects for solving the problem) The deformed steel sheet pile according to the present invention has a longitudinally continuous groove formed at an arbitrary position on either side of the web, and this groove is set at the bending point. It is constructed by bending the joints at both ends so that they move away from each other or approach each other, and by changing the position of the groove according to the a dimension of the corner part, JAST's deformed steel sheet piles can be easily and at low cost. It was made so that it could be obtained.

Next, in the method for manufacturing deformed steel sheet piles according to the present invention, a rough U-shaped steel sheet pile is obtained by performing breakdown rolling and rough hole rolling from a hot steel billet in the same manner as for ordinary U-shaped steel sheet piles, and then finished. During rolling, grooves are formed in the web of rough U-shaped steel sheet piles, and the grooves are used as bending points to bend by pressing or roll forming, making it possible to manufacture deformed steel sheet piles relatively easily and at low cost. This is what I did.

(Example) The present invention will be described below based on an illustrative example.

As shown in Figure 1, there are two Larsen type joints on both ends.
Forming an arc-shaped groove 3 continuous in the longitudinal direction on the inner surface of the web 1A of a normal U-shaped steel sheet pile 1 having
Using this groove 3 as a bending point, bend the joints 2 at both ends away from each other to form a deformed steel sheet pile 4 for large size A as shown in Fig. 2A, or bend it to the opposite side so that the joints 2 approach each other. A deformed steel sheet pile 5 for small a size is obtained.

As shown in FIG. 3, the groove 3 has h=(0.5~0.3)t and w=(0.9~1.2)t for the plate thickness t,
In the case of FIG. 2A, the bent portion has an appropriate R shape as shown in FIG. 4A, so it can be used as is.
In the case shown in FIG. 2B, the groove 3 is notched, so as shown in FIG. 4B, a weld overlay 6 is applied to melt the notch for reinforcement. After welding, a grinder finish is applied.

Further, the groove 3 may be formed on the outer surface of the web 1A, and in this case, the weld overlay 6 will be applied to the side shown in FIG. 2A.

In any case, as long as the bent portion has an R shape, it can be used as is for water-stopping applications where the strength of the sheet pile is not required. For earth retaining applications that require sheet pile strength, the R section is reinforced by welding.

With such deformed steel sheet piles 4 and 5, by appropriately changing the position of the groove 3 and bending in any direction, it is possible to cover all dimensions a and obtain a straight sheet pile shape at the corner ( (See Figure 5).

Next, manufacturing of such deformed steel sheet piles 4 and 5 is as follows:
As shown in FIG. 6, this can be carried out by similar rolling of a normal steel sheet pile consisting of a breakdown mill 7, a rough hole rolling mill 8, and a finishing mill 9.

That is, a hot steel billet is subjected to groove rolling using a breakdown mill 7 and a rough hole rolling mill 8 to obtain a normal rough U-shaped steel sheet pile. And normally,
Finishing rolling is performed in one pass in a finishing rolling mill 9 (either a groove rolling mill or a universal mill) to obtain a product. In the present invention, as shown in FIG. 7, an arcuate projection 10 is formed on the roll, and the web 10 is
Form groove 3 in A.

In this case, it is more convenient to use a groove rolling mill as the finishing mill. In other words, deformed steel sheet piles are used only at corners when driving sheet piles, so the demand for them is extremely small compared to general materials. It is troublesome and costly to rearrange new rolling rolls for this small amount of material, but in the case of a groove rolling mill, the groove of the present invention is placed next to the finishing groove on the same roll. The grooved steel sheet piles of the present invention can be easily and easily formed by passing the irregular-shape hole die in place of the usual finishing hole die for one final finishing pass in the same lot as the rolling of the normal material. Can be rolled at low cost.

The subsequent refining process includes cutting, cooling, and straightening, but in this process, since the steel sheet pile has approximately the same shape as a normal steel sheet pile, it is manufactured in exactly the same process as general steel sheet piles.

Thereafter, the sheet piles are bent along the grooves to match the corner angles in response to requests from the sheet pile driving site.

This processing includes, for example, a method of bending the sheet pile while sequentially moving the press little by little in the longitudinal direction using a press, and a method of bending the sheet pile in several passes by passing the sheet pile through a bending roll stand using roll forming.

In any case, the grooved portion is the easiest to bend, so it can be easily bent at a relatively steep angle.

It goes without saying that even grooved steel sheet piles can be used as normal steel sheet piles without bending.

(Effect of the invention) As mentioned above, the deformed steel sheet pile according to the present invention has the following effects:
Since the web is constructed by forming a groove at an arbitrary position and bending the web using the groove as a bending point, it is possible to easily obtain a deformed steel sheet pile with a straight fit according to the dimension a of the corner portion at a low cost.

According to the manufacturing method according to the present invention, it is only necessary to make slight improvements to ordinary steel sheet pile rolling equipment.
JAST's deformed steel sheet piles can be manufactured in a short time and at low cost.

For example, conventional processing of deformed steel sheet piles required about 3 days for gas cutting surface finishing, welding, and strain relief, but according to the present invention, one sheet pile (10 m) can be finished in about 4 to 5 hours. It is possible to reduce processing costs.

[Brief explanation of drawings]

FIG. 1 is a front view showing a U-shaped steel sheet pile according to the present invention, FIGS. 2A and B are plan views showing a deformed steel sheet pile according to the present invention, and FIG. 3 is a partially enlarged view of FIG. 1. Figures 4A and B are partially enlarged views of Figures 2A and B, and Figure 5
The figure is a graph showing the applicable range, Figure 6 is a schematic diagram showing a rolling line for carrying out the manufacturing method according to the present invention, Figures 7A and B are schematic diagrams showing a finishing mill, and Figure 8 is a schematic diagram showing a finishing rolling mill. It is a top view showing a conventional deformed steel sheet pile. 1...U-shaped steel sheet pile, 1A...web, 2...joint, 3...groove, 4, 5...deformed steel sheet pile, 6...welded overlay, 7...breakdown mill, 8...rough Groove rolling mill, 9...finishing rolling mill, 10... protruding portion.

Claims (1)

[Scope of Claims] 1. A U-shaped steel sheet pile for corners having joints at both ends, wherein a longitudinally continuous groove is formed at an arbitrary position on either side of the web, and this groove is bent. A deformed steel sheet pile characterized in that the joints at both ends are bent away from each other. 2 A U-shaped steel sheet pile for corners with joints at both ends, in which a groove continuous in the longitudinal direction is formed at an arbitrary position on either side of the web, and this groove is used as a bending point to connect the joints at both ends. A deformed steel sheet pile characterized by being bent so that the two sides approach each other. 3. A method for producing corner U-shaped steel sheet piles having joints at both ends, in which a rough U-shaped steel sheet pile is produced by performing breakdown rolling and rough-hole rolling in the same manner as normal U-shaped steel sheet piles from a hot steel billet. A method for producing a deformed steel sheet pile, which comprises obtaining a sheet pile, forming a groove in the web of the rough U-shaped steel sheet pile during finish rolling, and performing a bending process using the groove as a bending point.