JP2003049422A - Steel sheet pile with asymmetric joint, and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel sheet pile with a laterally asymmetric joint and a manufacturing method of the steel sheet pile having excellent driving performance, joint detaching resistance and watertightness, rapidly and economically manufactured and causing no trouble at a driving site. SOLUTION: This steel sheet pile has the laterally asymmetric joint having an arm part 1c extending almost parallel with a driving normal line direction, and capable of connecting the adjoining steel sheet piles to each other with the cross-sectional shape arranged in the same direction, by the engagement of an outward joint 1a and an inward joint 1b. In this constitution, the opening part width K1 of the outward joint 1a, the opening part width K2 of the inward joint 1b, the maximum thickness Nt1 of the outward joint 1a and the maximum thickness Nt2 of the inward joint 1b are set to satisfy the relation of 0.65<=Nt1/2<=1.00 and 0.85<=Nt2/K2<=1.50 or less.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is used for various applications in the field of civil engineering and construction, for example, as an earth retaining wall and a closing wall in civil engineering work, and as a foundation in the construction work of buildings and structures. In particular, the present invention relates to a steel sheet pile having a left-right asymmetric joint shape and a manufacturing method thereof.

[0002]

2. Description of the Related Art In a conventional general U-shaped steel sheet pile, when a wall body is formed, the steel sheet piles must be placed upside down one by one, so that the construction period of the wall body becomes long and Since the thickness (width) of the body is larger than the construction method using a small H-shaped steel, it is suitable for construction in the suburbs of cities where close construction with adjacent land is required from the viewpoint of effective use of land. There is a problem that it does not work.

The present applicant has developed a U-shaped steel sheet pile having a left-right asymmetric joint in order to solve such a problem (see, for example, JP-A-9-100541).

FIG. 1 shows an example of a steel sheet pile having the above-mentioned left-right asymmetric joint shape (hereinafter, simply referred to as an asymmetric steel sheet pile). The main portion has a U-shaped cross section, one is outward, and the other is Asymmetrical joints 1a on both sides formed inward,
1b and arm portions 1c on both sides for connecting the main part and the asymmetric joints 1a and 1b, respectively.

FIG. 2 shows the joints 1a, 1 of this asymmetric steel sheet pile 1.
The detail of the engagement state of b is shown, and the cross-sectional shapes can be aligned and aligned in the same direction. That is, as shown in FIG. 3, the joints 1a and 1b at both ends of the asymmetric steel sheet pile 1 are provided.
Flat arm 1c in the same direction as the driving normal near
Is formed, and the joint portion and the arm portion 1c with which the joints 1a and 1b are engaged with each other are located at the innermost edge of the sheet pile wall 2 (indicated by a dashed line in the figure).

Further, one joint 1a is formed outward with respect to the innermost edge of the sheet pile wall 2 (corresponding to the front surface on the excavation side), and the other joint 1b is formed inward, so that FIG. As shown, they can be engaged with each other in such a manner that they are not exposed on the wall surface of the sheet pile wall 2. Further, a protrusion 3 for restraining rotation of the joint portion is provided on the outward facing joint 1a side.

Further, when the asymmetric steel sheet pile 1 is used,
When the steel sheet pile 1 is driven by a hydraulic press-fitting machine or a vibro hammer, the arm portion 1c can be chucked and driven as shown in FIG. The flat arm portion 1c is located on the same line as the joints 1a and 1b with respect to the direction of the driving normal, and is not displaced in plan view from the joint portion which is the center of rotation generated during driving, and thus is chucked. There is an advantage that the steel sheet pile 1 can be prevented from rotating due to the driving force acting on the portion.

By the way, as shown in the case of an asymmetric steel sheet pile in FIG. 3, in order to continuously place a large number of steel sheet piles 1 next to each other in the soil, a new joint is attached to the already piled steel sheet piles 1. The other steel sheet pile is placed in engagement with the other, and the other steel sheet pile 1 is driven into the ground while sliding the joints 1a and 1b of the respective steel sheet piles 1.

As described above, the driving resistance generated when driving the steel sheet pile is about 70% of the total driving resistance due to the sliding between the joints 1a and 1b, and the resistance of the joint portion is that of the steel sheet pile. It has been clarified that the setting performance is greatly affected.

Generally, as a performance required for a joint portion of a steel sheet pile, JIS A5528 (steel sheet pile for hot rolling) says, "The joint of the steel sheet pile has a shape which is sufficiently engaged at the time of driving and easily detached at the time of pulling out. The structure must be as watertight as possible ", and it is easy to place during the construction work, and the joints do not separate in the soil. After that, it has sufficient strength against earth pressure and the like, and further has a certain degree of watertightness (waterproofness).

In general, in order to obtain a steel sheet pile that is easy to drive, the outer portion of the joint portion may be thin and the opening width of the joint portion and the inner area of the joint portion may be set large. However, if these are set to be large, the joint portion is likely to come off, and it becomes difficult to construct the earth retaining wall or the like.

Further, the earth and sand easily flow out from the voids formed between the joint portions, and the original purpose of the earth retaining wall cannot be achieved. On the other hand, conversely, if the outer side of the joint is thick and both the opening width of the joint and the inner area of the joint are set small, the joint easily separates and the watertightness improves, The resistance at the time of driving increases, and the driving itself becomes difficult or impossible.

That is, since there is a trade-off relationship between the ease of driving a steel sheet pile and the joint detachment resistance, watertightness, etc., in order to satisfy all of these at a high level, the shape of the joint portion of the steel sheet pile is required. And it was necessary to carefully determine the dimensions and manage them so that the product dimensions at the time of manufacture would not vary.

As an example, Japanese Patent Laid-Open No. 2000-192452.
Japanese Unexamined Patent Publication No. 10-192905 discloses a steel sheet pile having excellent joint water-stopping properties, and Japanese Unexamined Patent Publication No. 10-192905 discloses a method of manufacturing a steel sheet pile having excellent joint dimensional accuracy.

Further, the joint of the steel sheet pile having the asymmetric joint as shown in FIG. 1 is special unlike the general sheet pile, and moreover, depending on the joint shape, the left and right bends of the product, the vertical warp, and the total width difference, when the steel sheet pile is placed, There is a risk that the joint may come off, or the joint resistance may become excessive, making placement difficult.

[0016]

As described above, FIG.
It is difficult to achieve both the driving performance of the asymmetrical steel sheet pile as well as the joint detachment resistance and watertightness, and the left-right bending and vertical warpage of the product also impaired the driving performance of the asymmetrical steel sheet pile. .

Therefore, depending on the dimensional variation of the asymmetrical steel sheet pile during manufacturing, troubles may occur during driving, and conversely, if the dimensional variation is to be controlled more severely than necessary, the yield at the time of production will decrease and the delivery time will be delayed. As a result, it was not possible to manufacture a steel sheet pile, which has both a high level of driving performance, joint detachment resistance and watertightness, at low cost in a timely manner and to supply it to the construction site.

The object of the present invention is to achieve both a high level of plasterability, joint detachment resistance, and watertightness, rapid and economical manufacture, and troubles at the casting site. (EN) A steel sheet pile having a left-right asymmetric joint that is excellent in quality and a manufacturing method thereof.

[0019]

Means for Solving the Problems The inventor of the present application, through actual manufacturing of steel sheet piles having asymmetric joints of various shapes and a huge number of driving tests, the dimensions of the joint portion of the steel sheet piles having asymmetric joints, We succeeded in obtaining the knowledge that the above problems can be solved by defining left and right bends, vertical warpage or full width difference in a specific range, and by reflecting this in the manufacture of the steel sheet pile, the above-mentioned problems It has been clarified that the above problems can be solved, and the present invention has been completed.
That is, the gist of the present invention is as follows.

A steel sheet pile having an asymmetric joint according to claim 1 of the present application comprises a main part constituting a steel sheet pile body, and one asymmetric joint on both sides, one of which faces outward and the other of which faces inward.
It is provided with both side arm portions respectively connecting the main portion and the asymmetric joint, the arm portion extends substantially parallel to the driving normal direction, and adjacent steel sheet piles are aligned in the same cross-sectional shape in the same direction. A steel sheet pile that can be connected by engaging an outward joint and an inward joint of the asymmetric joint, the opening width K1 of the outward joint, the opening width K2 of the inward joint, The maximum thickness Nt1 of the outward joint and the maximum thickness Nt2 of the inward joint are 0.65 ≦ Nt1 / K2 ≦ 1.00 and 0.85 ≦ Nt2 / K1 ≦ 1.50 It is characterized by satisfying the relationship.

The invention according to claim 2 is a steel sheet pile having an asymmetric joint according to claim 1, when the left and right bends over the entire length of the product are product length ≤ 10 m: bend ≤ product length x 0.00
06 Product length> 10 m: Bent ≤ 6 mm + (product length-10 m) x 0.0002 It is characterized by satisfying the range.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the steel sheet pile having the asymmetric joint according to, the vertical warp over the entire length of the product is characterized by satisfying the range of vertical warp ≦ product length × (0.001 or 20 mm, whichever is smaller).

According to a fourth aspect of the invention, in the steel sheet pile having the asymmetric joint according to the first, second or third aspect, the total width difference (= the maximum width maximum value-the minimum width value) over the entire length of the product is 4.
It is characterized by being within mm.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a steel sheet pile having an asymmetric joint, wherein a main portion constituting a steel sheet pile main body, one asymmetric joint on both sides formed outward and the other inward. A main part and arm portions on both sides respectively connecting the asymmetric joint are provided, the arm portion extends substantially parallel to the driving normal direction, and adjacent steel sheet piles are aligned in the same cross-sectional shape in the same direction. A method for manufacturing a steel sheet pile that can be connected by engaging an outwardly facing joint and an inwardly facing joint of an asymmetric joint, wherein the opening width K1 of the outwardly facing joint and the opening width K2 of the inwardly facing joint. , The maximum thickness Nt1 of the outward fitting, and the maximum thickness Nt2 of the inward fitting.
Is to adjust the roll hole type and / or the roll opening in the rolling so as to satisfy the relationship of 0.65 ≦ Nt1 / K2 ≦ 1.00 and 0.85 ≦ Nt2 / K1 ≦ 1.50. It is a feature.

The invention according to claim 6 is, in the method for manufacturing a steel sheet pile having an asymmetric joint according to claim 5, when the left and right bends over the entire length of the product are product length ≤ 10 m: bend ≤ product length x 0 .00
06 Product length> 10 m: Of the upper and lower roll hole types in rolling, the upper and lower roll opening degree, and the amount of roll lubricant so as to satisfy the range of bending ≦ 6 mm + (product length −10 m) × 0.0002 It is characterized in that at least one of them is adjusted, or the product after the rolling is finished is corrected for left-right bending.

The invention according to claim 7 is the invention according to claim 5 or 6.
In the method for manufacturing a steel sheet pile having an asymmetric joint according to
The vertical warp over the entire length of the product satisfies the range of vertical warp ≦ product length × (0.001 or 20 mm, whichever is smaller) It is characterized in that at least one or more of the lubricant amount is adjusted, or the product after rolling is corrected for vertical warp.

The invention according to claim 8 is the method for manufacturing a steel sheet pile having an asymmetric joint according to claim 5, 6 or 7, wherein the total width difference (= maximum width value-minimum width value) within the entire length of the product is within 4 mm. Therefore, the temperature of the material to be rolled is adjusted, or the product after rolling is subjected to full-width straightening.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a steel sheet pile having an asymmetric joint according to the present invention and a method for manufacturing the same will be described below in detail with reference to the accompanying drawings.

FIGS. 5A and 5B are enlarged views of the joint shape of the steel sheet pile having the asymmetric joint shown in FIG. Nt1 and Nt2 in the figure represent the claw thickness of the outward joint and the inward joint, respectively, that is, the maximum thickness of the engaging edge (claw) shown in the figure. Further, K1 and K2 in FIG. 5 are outward joints,
It shows the claw opening of the inward joint, that is, the minimum gap between the inner wall of the engaging edge (claw) shown in the figure and the joint portion facing the inner wall.

The inventor of the present application manufactured the steel sheet pile having the joint shape shown in FIG. 5 and the overall shape as shown in FIG. As a result of conducting a huge number of driving tests into the sandy ground shown in (Relationship between N value and underground depth), the joint shape of the steel sheet pile, and the dimensional shape of the steel sheet pile and the driveability are determined. Found that there are various relationships as described below. (Here, the N value is called the standard penetration test, in which a 63.5 kg weight is dropped from a height of 75 cm and the penetration sampler is 30 c.
It is an index of soil hardness expressed by the number of hits required to go around m. )

FIG. 6 shows the relationship between the joint shape of the steel sheet pile according to the present invention and the joint resistance increase amount. The amount of joint resistance increase on the vertical axis is the value obtained by dividing the force required for driving steel sheet pile into the soil by the length of the steel sheet pile in the soil at that time, that is, the average value of the amount of change in joint resistance during driving. Is taking As can be seen from the figure, the ratio Nt1 / K2 between the joint thickness and the joint opening on the horizontal axis is 0.65 to 1.0.
Within the range, there is a linear relationship between the joint resistance increase amount and Nt1 / K2, and it is understood that the joint resistance during driving is significantly increased with the increase of Nt1 / K2.

FIG. 7 shows the relationship between the joint shape and the driveability of the steel sheet pile according to the present invention, where the horizontal axis is Nt1 / K2 and the vertical axis is Nt.
2 / K1 is a summary of the driving test results of steel sheet piles having various joint shapes. From now on, 0.65 ≦ Nt1 / K2 ≦ 1.00, and 0.
It is understood that it is sufficient to satisfy the relationship of 85 ≦ Nt2 / K1 ≦ 1.50.

FIG. 8 shows the relationship between the horizontal bending of the steel sheet pile according to the present invention and the driving performance. The horizontal bending of the vertical axis is the value for each product measured before driving, and the product length is It is organized on the horizontal axis. From this figure, in order to avoid difficult placement, if the product length is within 10 m, left and right bends ≤ product length x 0.0006, and if the product length exceeds 10 m, left and right bend ≤ 6 mm + (Product length-10m)
It can be seen that x0.0002 may be set.

FIG. 9 shows the relationship between the vertical warp of the steel sheet pile according to the present invention and the castability. The vertical warp on the vertical axis is the value for each product measured before the casting, and the product length is It is organized on the horizontal axis. From this figure,
It is understood that when the product length is within 20 m, vertical warpage ≦ product length × 0.001 and when the product length exceeds 20 m, it is within 20 mm. That is, in other words, vertical warp ≦ (product length × 0.001 or 2
The smaller one (0 m) is fine.

FIG. 10 shows the relationship between the total width difference and the castability of the steel sheet pile according to the invention of the present application, and the total width difference on the vertical axis is the maximum value of the total width measured over the entire length of each product before driving. It is the difference from the minimum value, and is organized by taking the product length as the horizontal axis. From this figure, in order to avoid setting difficulty, the total width difference (= maximum width-minimum width) across the entire length of the product is 4 mm.
It turns out that it is all right.

Next, a method for manufacturing the asymmetric steel sheet pile according to the present invention will be described. First, in order to set the above-mentioned joint thickness / joint opening within an appropriate range, in addition to the method of optimizing each hole type of the rolling rolls (upper roll 11 and lower roll 12) as illustrated in FIG. There is a method of adjusting the opening degree of the roll for each rolling pass according to the rolling groove type.

For example, by increasing the roll opening in FIG. 12 (b), the opening of the outward joint located on the left side of the drawing is increased, and by increasing the roll opening in FIG. 12 (c). , The opening degree of the inward joint located on the right side of the drawing increases. When reducing the joint opening, the roll opening may be adjusted in the opposite direction for each hole type.

FIG. 13 illustrates a method for suppressing the occurrence of left-right bending in the manufacturing process of the steel sheet pile according to the present invention. When rolling the rolled material 10 (the asymmetric steel sheet pile according to the present invention) with the double-rolled upper and lower rolls having the hole shape, the upper roll 11 and the rolled material 1 are provided on the roll entrance side as shown in the figure.
0 By supplying a lubricant (lubricant oil 13 for hot rolling in the figure) to a part of the upper surface (right side area in the rolling direction), friction between the material 10 to be rolled and rolls in the area to which the lubricant is supplied The coefficient is lower than in other regions, and the extension of the material 10 to be rolled in the rolling-down region changes from side to side, causing left bending toward the rolling direction on the roll exit side. By supplying the lubricant to the left side region of the upper surface of the roll 11 or the material to be rolled 10 in the rolling direction, a right turn is generated on the roll exit side.

Of course, when the roll and the material to be rolled 10 are lubricated up and down, the supply amount of the lubricant may be adjusted up, down, left and right. That is, the amount of lubricant supplied to the upper and lower rolls and / or the upper and lower surfaces of the material to be rolled 10 is set to the material to be rolled 10
The material to be rolled 10 is set by appropriately setting it in the width direction and rolling.
It is possible to suppress the occurrence of left and right bends.

Further, although not shown, it is possible to suppress the left and right bends by optimizing the hole dies formed in the upper and lower rolls and adjusting the roll opening according to the rolling pass of each hole die. is there. That is, specifically, the hole shape may be corrected and the roll opening for each rolling pass in each hole type may be adjusted so that the right and left of the material to be rolled have different extensions during rolling. Further, when the body length of the rolls is relatively long, it is also possible to provide a difference in opening between both ends of the upper and lower rolls.

FIG. 14 shows an example of a method for suppressing the occurrence of vertical warpage in the manufacturing process of the asymmetric steel sheet pile according to the present invention. When rolling the rolled material 10 (the asymmetric steel sheet pile according to the invention of the present application) with the upper and lower double rolls having the hole shape, the rolled material 10 is rolled on the roll entrance side by lowering the roll path center as shown in the figure. Causes downward warp on the roll exit side, and conversely by raising the roll path center, although not shown, the rolled material bites upward on the roll entrance side, causing downward warp on the roll exit side. Occur. Therefore, by appropriately setting the roll pass center and rolling, it is possible to suppress the occurrence of vertical warpage of the material to be rolled.

Further, as another method of controlling the vertical warp when rolling the material 10 to be rolled by the double roll of the upper and lower type as shown in FIG. 14, there is a method of changing the roll diameter up and down, which is usually the upper and lower. P. of the roll C. D. (Pass Cen
ter Diameter) is generally matched, but if vertical warp easily occurs, the roll P. C. D. It can be dealt with by changing up and down. That is, in order to suppress the warp, the P. C. D. > P. of lower roll C. D. P. of the upper roll can be used to suppress the warp. C. D. <P. C. D. And it is sufficient.

Although not shown, vertical warping can be suppressed by optimizing the cavities formed in the upper and lower rolls and adjusting the roll opening according to the rolling pass of each cavities. Needless to say.

FIG. 15 shows an example of still another method for suppressing the occurrence of vertical warp in the manufacturing process of the steel sheet pile according to the present invention. Rolled material 1 with upper and lower double rolls with hole shape
When rolling 0 (asymmetric steel sheet pile according to the present invention),
As shown in the figure, by supplying a lubricant (lubricant oil 13 for hot rolling in the figure) to the upper roll and the upper surface of the material to be rolled on the roll entrance side, the friction coefficient between the material to be rolled 10 and the upper roll 11 is lowered. Compared with that between the roll 12 and the material 10 to be rolled,
Since the elongation of the rolled material 10 in the rolling-down region changes up and down, a warp occurs on the roll-out side, and conversely, although not shown, by supplying a lubricant to the lower roll or the lower surface of the rolled material, the roll-out occurs. Warp occurs on the side.

Of course, when the roll and the material to be rolled are lubricated up and down, the supply amount of the lubricant may be adjusted up and down. That is, by appropriately setting the amount of lubricant supplied to the upper and lower rolls and / or the upper and lower surfaces of the material to be rolled and rolling, it is possible to suppress the occurrence of vertical warpage of the material to be rolled.

The method for suppressing the lateral bending and vertical warpage that occur in the hot rolling process of the asymmetric steel sheet pile according to the present invention has been described above. However, due to the temperature nonuniformity of the material to be rolled in the hot rolling process, In many cases, the product may bend left and right or warp vertically during the cooling process to room temperature. In such a case, the product after completion of cooling can be straightened by using a roller straightening machine or a press straightening machine so as to be within the size range disclosed in the present invention.

FIG. 16 shows a patent No. 28 by the present inventors.
In addition to the web portion 21 and the flange portion 22 of the asymmetrical U-shaped steel sheet pile disclosed in Japanese Patent No. 74611, the arm portion 23 is constrained from the vertical direction to deform the sectional shape of the steel sheet pile according to the present invention with a roller straightening machine. It shows the method of straightening without correction.

Further, FIG. 17 shows the invention of the present application by pressing the outer surface of the flange 31a on one side of the steel sheet pile 30 while pressing the inner surface of the other flange 31b, which is disclosed in Japanese Patent No. 3129179 by the present inventor. 2 shows a press straightening method capable of efficiently straightening the left-right bending of the asymmetrical steel sheet pile 30 according to the present invention.

Further, when the asymmetric steel sheet pile according to the present invention is manufactured in the hot rolling process as shown in FIG. 11, when the variation of the full width exceeding the dimension specified in the present invention occurs, each rolling mill It is effective to suppress the temperature distribution (temperature difference) of the material to be rolled in the rolling direction.

That is, when the material is heated, it is allowed to stay in the heating furnace for a predetermined time to increase the soaking degree of the material, and in the rolling process, the rolling speed is maintained at a predetermined value or more, and the transfer time between rolling mills is shortened. By limiting the use of roll cooling water and high-pressure descaling water for each rolling mill, it is possible to minimize the temperature distribution (temperature difference) in the rolling direction of the material to be rolled, especially in finish rolling. .

In the case where the product has a full width variation exceeding the specified value during the cooling process to room temperature due to the temperature nonuniformity of the material to be rolled in the hot rolling process, the roller after completion of cooling is not shown in the figure. It is possible to straighten using a straightening machine or a press straightening machine and to fit within the size range disclosed in the present invention.

The above description has been made by taking the case of the asymmetrical steel sheet pile shown in FIG. 1 as an example. However, the entire shape of the steel sheet pile is asymmetrical as shown in FIG. 18 in addition to the asymmetrical U-shaped steel sheet pile shown in FIG. It may be a straight-lined steel sheet pile having a joint, and by designing and manufacturing control of the joint and the product shape of the present invention, rapid and economical production of a steel sheet pile having excellent quality which is the object of the present invention. It is possible to exert effects such as prevention of casting trouble in the customer.

Further, the steel sheet pile having the asymmetric joint according to the present invention and the manufacturing method thereof will be described more specifically with reference to the data of the embodiments.

In FIG. 1, the total width is 640 mm and the total height H.
200 mm asymmetric steel sheet pile was manufactured in a rolling mill having a mill layout shown in FIG. As a material, width 700
mm, 250 mm thick, using a continuous casting bloom, after heating to about 1250 ° C. in a heating furnace, a rough rolling mill, an intermediate rolling mill,
Reverse rolling of three passes or more was performed by three rolling mills of finish rolling mills to form a predetermined product shape, sawing to a predetermined product length, and then allowed to cool to room temperature.

All of the above-mentioned three rolling mills are double rolling mills consisting of upper and lower two rolls having a plurality of hole patterns formed therein. The material to be rolled was shifted in the roll axis direction to a predetermined hole position using a side guide provided on the inlet side and the outlet side of the rolling mill, and then bitten into the rolling mill.

Among the rolling lines of the rolling line of FIG. 11, as the roll hole type of the finishing rolling mill, the hole type before joint bending (K-3) and the joint bending forming hole (K- are shown in FIGS. 12 (a) to 12 (c). 2, K
-1) is shown. In this case, first, in FIG. 12 (a), the groove-type rolling for adjusting the asymmetrical joint shape according to the steel sheet pile of the present invention is performed, and as shown in FIG. 12 (b), the groove-type (K-2) Bending of the outward (left side) joint was performed. Next, as shown in FIG. 12 (c), the inward (right) joint was bent and formed in the hole type (K-1).

In the rolling process in the intermediate rolling mill and finish rolling mill of FIG. 11, since the material to be rolled was warped up and down,
The opening of the roll of each rolling mill and the pass line were adjusted. In addition, since left-right bending was observed in the finish rolling process, the injection amount of rolling lubricating oil was adjusted in the width direction of the material to be rolled.

Table 1 shows the product length, the number of products, and the joint opening, joint thickness, and left and right bend measured at 1 m intervals in the length direction for each product regarding the asymmetric steel sheet pile manufactured by the method of the present invention. Shows the minimum and maximum of the measured values of vertical warp and full width difference. The table shows these products in FIG.
The situation at the time of placing on the ground shown in is also shown, but the placing was completed without trouble for all products.

Table 1 shows, as a comparative example, dimensional measurement values and driving conditions of steel sheet piles that do not satisfy the dimensions and shape of the invention of the present application, but the joint resistances of these steel sheet piles are shown. The installation efficiency was extremely large and the installation efficiency was extremely low, or the installation could not be continued in the middle of the installation, or conversely, the fitting was loose during the installation and the fittings were separated from each other.

[0060]

[Table 1]

[0061]

As described above, according to the present invention, a steel sheet pile having a left-right asymmetric joint having no quality defect which may cause troubles during driving such as joint disengagement, full width variation, left-right bending, and vertical warp. In addition to providing the above, it also provides a method for efficiently and economically manufacturing the product, which is economical and industrially valuable.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing one form of an asymmetric steel sheet pile.

FIG. 2 is a horizontal sectional view showing one form of a joint shape of an asymmetric steel sheet pile.

FIG. 3 is a horizontal sectional view showing a joint joining state of asymmetric steel sheet piles.

FIG. 4 is a horizontal sectional view showing an example of a method for driving an asymmetric steel sheet pile.

FIG. 5 is a view for explaining the dimensional relationship of a steel sheet pile having an asymmetric joint of the present invention, in which (a) is an inward joint,
(b) is a horizontal sectional view of the outward joint.

FIG. 6 is a graph showing a relationship between a joint shape and a joint resistance increase amount of a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 7 is a graph showing the relationship between the joint shape and the driveability of a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 8 is a graph showing a relationship between lateral bending and driving performance of a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 9 is a graph showing the relationship between vertical warp and driveability of a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 10 is a graph showing the relationship between the total width difference and the driveability of a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 11 is an explanatory view showing an example of a rolling line for manufacturing a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 12 is a cross-sectional view showing an example of a joint bending method for a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 13 is an explanatory diagram showing the relationship between roll lubrication and left-right bending when manufacturing a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 14 is an explanatory diagram showing a relationship between a low-pass center and vertical warpage when manufacturing a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 15 is an explanatory diagram showing the relationship between roll lubrication and vertical warpage when manufacturing a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 16 is a cross-sectional view showing an example of a roller straightening method when manufacturing a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 17 is a cross-sectional view showing an example of a press straightening method when manufacturing a steel sheet pile having an asymmetric joint according to the present invention.

FIG. 18 is a horizontal sectional view showing another embodiment of the steel sheet pile having the asymmetric joint of the present invention.

FIG. 19 is a line graph showing the relationship between the N value and the underground depth of the ground on which the performance confirmation test of Table 1 of the steel sheet pile having the asymmetric joint of the present invention was performed.

[Explanation of symbols]

1 ... Asymmetric steel sheet pile, 1a, 1b ... Joint, 1c ... Arm part, 2
... Steel sheet pile wall, 3 ... Protrusion, 10 ... Rolled material, 11 ... Upper roll, 12 ... Lower roll, 13 ... Lubricating oil, 14a ... Incoming table roller, 14b ... Outgoing table roller, 21 ... Web part, 22 ... Flange portion, 23 ... Arm portion, 24, 25 ... Joint, 26 ... Upper straightening roller, 27 ... Lower straightening roller, 2
8 ... Outer straightening roller, 30 ... Asymmetric steel sheet pile, 31a, 3
1b ... Flange, 32a, 32b ... Press jig, 33
... connection part, 34 ... bolt, 35 ... screw hole, 36 ... press ram head connection part, 41 ... chucking device,

Claims (8)

[Claims] 1. A main part constituting a steel sheet pile main body, asymmetric joints on one side formed outward on one side and inward on the other side, and arm parts on both sides connecting the main part and the asymmetric joint, respectively. And the arm portion extends substantially parallel to the direction of the driving normal, and the adjacent steel sheet piles are aligned in the same cross-sectional shape in the same direction. A steel sheet pile that can be connected by combining
The opening width K1 of the outward joint, the opening width K2 of the inward joint, the maximum thickness Nt1 of the outward joint,
And a steel sheet pile having an asymmetric joint, wherein the maximum thickness Nt2 of the inward joint satisfies the following relationship. 0.65 ≦ Nt1 / K2 ≦ 1.00 and 0.85 ≦ Nt2 / K1 ≦ 1.50 2. The steel sheet pile having an asymmetric joint according to claim 1, wherein the left and right bends of the entire product satisfy the following range. Product length ≤ 10 m: Bending ≤ Product length x 0.00
06 Product length> 10 m: Bend ≤ 6 mm + (product length-10 m) x 0.0002 3. A steel sheet pile having an asymmetric joint according to claim 1 or 2, wherein the vertical warp of the entire product satisfies the following range. Vertical warp ≤ product length x (0.001 or 20 mm, whichever is smaller) 4. The steel sheet pile having an asymmetric joint according to claim 1, 2 or 3, wherein a full width difference (= full width maximum value−full width minimum value) over the entire length of the product is within 4 mm. 5. A main part constituting a steel sheet pile main body, asymmetric joints on both sides formed with one facing outward and the other facing inward, and arm parts on both sides connecting the main region and the asymmetric joint, respectively. And the arm portion extends substantially parallel to the direction of the driving normal, and the adjacent steel sheet piles are aligned in the same cross-sectional shape in the same direction. A method for manufacturing a steel sheet pile that can be connected by joining, the opening width K1 of the outward joint, the opening width K2 of the inward joint, the maximum thickness Nt1 of the outward joint, and Maximum thickness Nt2 of the inward fitting
However, the method of manufacturing a steel sheet pile having an asymmetric joint, characterized in that the roll hole type and / or the roll opening degree in rolling is adjusted so as to satisfy the following relationship. 0.65 ≦ Nt1 / K2 ≦ 1.00 and 0.85 ≦ Nt2 / K1 ≦ 1.50 6. Adjusting at least one or more of the upper and lower roll hole types, the upper and lower roll opening degree, and the amount of roll lubricant in rolling so that the left-right bending over the entire length of the product satisfies the following range, or The method for manufacturing a steel sheet pile having an asymmetric joint according to claim 5, wherein right-and-left bending is corrected on the product after rolling. Product length ≤ 10 m: Bending ≤ Product length x 0.00
06 Product length> 10 m: Bend ≤ 6 mm + (product length-10 m) x 0.0002 7. A vertical roll hole type in rolling so that the vertical warp over the entire length of the product satisfies the following range:
7. At least one of the upper and lower roll diameters, the roll pass center, and the amount of roll lubricant is adjusted, or the product after rolling is corrected for vertical warp, and the warp is corrected. A method for manufacturing a steel sheet pile having an asymmetric joint. Vertical warp ≤ product length x (0.001 or 20 mm, whichever is smaller) 8. The temperature of the material to be rolled is adjusted such that the difference in full width over the entire length of the product (= maximum full width-minimum full width) is within 4 mm, or the full width of the product after rolling is corrected. 8. The method according to claim 5, 6 or 7 is performed.
A method for manufacturing a steel sheet pile having the above described asymmetric joint.