Definitions

• the present invention relates to a steel sheet pile used for civil engineering and construction, for example, and a steel sheet pile (hereinafter referred to as asymmetric steel sheet pile) having an asymmetrical joint shape in particular, and a manufacturing method thereof by hot rolling.
• the present invention further relates to a corner steel sheet pile used at a corner of a steel sheet pile wall and a method of manufacturing the same.
• FIG. 1 is a schematic cross-sectional view of a steel sheet pile 1 having an asymmetrical joint shape disclosed in the above-mentioned publication, and as will be understood from this, the steel sheet pile 1 comprises a flange portion 2, a web portion 3 and It consists of joints 4 and 5 installed asymmetrically on both sides.
• -Fig. 2a is an explanatory view schematically showing an example of the combination when the asymmetric steel sheet pile 1 as described above is actually used for retaining earth adjacent to the adjacent land (AL), and the conventional symmetry is shown.
• Fig. 2b showing the case of using steel sheet pile 6.
• the area shown by the broken line is the machine occupation area (WA), and if it is possible to secure a sufficient work area, it indicates the area where steel sheet piles can be cast in the ground. Also, it can be seen that the thickness (D, D 2 ) of the sheet wall is much narrower in the case of Fig. 2 (a).
• U-shaped steel sheet piles are placed in the ground by alternately joining the joints at their ends, and continuous earth retaining is performed, but in the case of changing the direction of the wall, A steel sheet pile for corners is used which has a different cross section at the corners than the other parts. This is called the core steel sheet pile.
• a corner steel sheet sheet with a special shape can not but be used at the corners as with conventional symmetrical steel sheet pile walls.
• FIGs 3 (a) and 4 (a) show conventional corner steel sheet piles. That is, as shown in Fig. 3 (a), the same U-shaped steel sheet is cut by the web on the back surface 8 of the web of the U-shaped steel sheet pile 7, and its half is fixed by welding (hereinafter 4 or (a), it is conceivable that the center of the web part 9 of the U-shaped steel sheet pile 7 is bent and the appropriate welding is applied to the inner corner (hereinafter referred to as W shape).
• Fig. 3 (b) and Fig. 4 (b) are schematic explanatory views schematically showing the form of driving at the corner portion of each corner sheet pile.
• the weight of the T-type increases by approximately 1.5 times, and it is difficult to understand the chuck of a bipro piling machine that is usually used to drive this type of steel sheet pile, and in addition, stacking is difficult. It is inconvenient for storage and transportation because it can not.
• W-shaped reinforcement welding even if W-shaped reinforcement welding is used, the section coefficient becomes very small, so it is difficult to ensure the safety of earth retaining at the corners. In some cases, there is a limit to the method of chucking and driving with the machine. ⁇
• each joint part is made little by little by several passes with a plurality of hole type rolls.
• the deformation process leading to the product is designed to proceed symmetrically, and the mouth-hole type is also designed symmetrically.
• joint bending process is performed simultaneously in the same pass by the left-right symmetric hole type roll.
• Figures 5 (a) and 5 (b) show the upper roll (UR) and the lower roll (R.) of the hot-rolling roll hole type of the generally symmetrical U-shaped steel sheet pile, respectively.
• the rolled material 11 which is a U-shaped steel sheet pile consisting of both flanges 10, webs 12 and joints 14 at both ends is a hole type (K 1 2) at the stage of FIG. 5 (a).
• the grate thickness and joint height hot rolling is almost finished except for bending of the joint, and then joint bending is performed using the hole type (K-1) shown in Fig. 5 (b). Finished in product shape.
• Figure 6 shows the joint bending process in the hole type (K-1) in more detail, and the process can be roughly divided into the following four stages.
• U-shaped steel sheet pile 11 which is a rolling material, only each part of flange part 10, web part 12 and joint part 14 is shown.
• the U-shaped steel sheet pile 1 1 shows a state when it comes out of the hole type (K 12), and in the process (I) Due to the impact, deformation prior to roll contact occurs, which mainly results in a reduction in the width of the steel sheet pile.
• “width” is the width of the entire U-shaped steel sheet pile.
• width reduction and joint bending are started by the collar 20 of the upper roll 18 coming into contact with the joint outer surface.
• step ( ⁇ ) contact between the lower roll 22 and the joint portion takes place, leading to the step (IV), bending of the upper and lower rolls 18 and 22 is completed by bending of the joint portion, and step (IV ')
• step (IV ') In the stage shown, the steel sheet pile product is obtained leaving K-1.
• Another object of the present invention is to provide a method of manufacturing a hot-rolled asymmetric steel sheet with a cross-sectional shape that does not cause an unstable rolling position or incomplete joint forming when bending a joint. It is to provide.
• Still another object of the present invention is to be applicable to U-shaped steel sheet piles having an asymmetrical joint, which can be gripped by chucks of a piling machine and transported during storage of steel sheet piles. It is providing a steel sheet pile and its manufacturing method.
• the present inventors can form a joint on the left and the right on the extension line of the flange by configuring one of the left and right asymmetrical joint shapes downward and the other upward. Found that no formation.
• the problem of the above-mentioned rolling position can be solved by holding the asymmetrical joint on both sides in multiple stages and bending it in multiple steps, but the rolling can be continued slightly with many passes. It is not economical and practical to do.
• the present inventors made various corner steel sheet piles for an asymmetric U-shaped steel sheet pile having the above new joint shape and conducted a placing test. As a result, one of the joints was bent inward.
• the present invention was completed by knowing that the steel sheet pile wall can be turned at right angles without using a special corner steel sheet pile such as a shaped steel sheet pile.
• the gist of the present invention is as follows.
• a main part comprising the steel sheet pile body, 2 asymmetric joints, and an arm connecting the main part and the non-symmetrical joints, one of the joints facing outward and the other of the joints being inside
• Asymmetrical steel sheet pile characterized by being formed in each direction.
• the arm portion extends parallel to the casting normal or the joint fitting axis, and the arm portion and the asymmetrical joint are arranged on the same line at the innermost edge of the sheet wall.
• the inner wall of the engagement rod of the inward joint is parallel to the placement normal of the asymmetric steel sheet pile, or the inner wall of the engagement edge of the outward joint and the placement normal of the asymmetric steel sheet
• the asymmetric steel sheet pile according to the above (5) characterized in that and are vertical.
• the steel sheet pile having an asymmetrical joint is formed by hot rolling, and A method of manufacturing a corner steel sheet pile, including the step of bending only one side of the inward joint or the outward joint of the steel sheet pile inward.
• the steel sheet pile having the asymmetrical joint is formed by hot rolling, After cutting either one of the inward joint or the outward joint of the steel sheet pile at the boundary between the joint and the arm, the joint is disposed inward, and thereafter the joint and the arm.
• Figure 1 is a schematic cross-sectional view of a conventional asymmetric U-shaped steel sheet pile.
• Fig. 2 (a) is a schematic explanatory view of the conventional asymmetric steel sheet pile of Fig. 1
• Fig. 2 (b) is a schematic explanatory view of respective usage examples of the conventional symmetric steel sheet pile.
• Fig. 3 (a) shows an example of a conventional corner steel sheet pile
• Fig. 3 (b) is a schematic explanatory view of its use example.
• Fig. 4 (a) shows an example of another conventional corner steel sheet pile
• Fig. 4 (b) is a schematic explanatory view of its usage example.
• Fig. 5 (a) is a schematic explanatory view of the pre-finish hole type (K-2) in a general roll shape for sheet rolling of U-shaped steel sheet piles
• Fig. 5 (b) is a schematic illustration of the finish hole type (K-1). is there.
• FIG. 6 is a schematic explanatory view of a joint bending process in a hole type (K 1 1).
• FIG. 7 is a schematic cross-sectional view of the asymmetric U-shaped steel sheet pile according to the present invention.
• FIG. 8 is a plan view showing the engaged state of the joint portion corresponding to the embodiment of FIG. 7;
• FIG. 9 is a plan view for explaining the placement method by checking the flash portion.
• Fig. 10 (a) shows the joint bending front of the roll hole type for U-shaped steel sheet sheet rolling with asymmetrical left and right shape (K-3 '), and Fig. 10 (b) and (c) shows the joint bending formed hole type It is typical explanatory drawing of (K 1 2 ', K 1)).
• FIG. 11 is a schematic cross-sectional view showing an example of the corner steel sheet pile of the present invention.
• FIG. 12 is a schematic cross-sectional view showing an example of the corner steel sheet pile of the crucible of the present invention.
• FIG. 13 (a) is an explanatory view showing a placement example of the corner steel sheet pile of the present invention
• FIG. 13 (b) is a partially enlarged view thereof.
• FIG. 14 is an explanatory view of an example of a method of manufacturing a corner steel sheet pile according to the present invention.
• FIG. 15 is a view showing another example of the method of manufacturing a corner steel sheet pile of the present invention.
• Fig. 16 is an explanatory view of the piling condition of the corner steel sheet pile of the present invention
• Fig. 16 (a) is a corner steel sheet pile in which the inward joint is bent inward
• Fig. 16 (b) is an outward joint. In the case of a corner steel sheet pile bent inward.
• FIGS. 17 (a) to 17 (f) are schematic explanatory diagrams showing the effects of deformation simulation of a rolled material in a hole type (K12 ′) according to the two-dimensional finite element method.
• FIG. 18 is an explanatory view of each portion of the joint portion.
• FIG. 19 is an explanatory view showing a construction example of the asymmetric steel sheet pile and the corner steel sheet pile according to the present invention.
• Fig. 7 shows the overall shape of the steel sheet pile 30 in one embodiment of the asymmetric U-shaped steel sheet pile according to the present invention
• Fig. 8 shows its joint part
• Fig. 9 shows the sheet pile wall formed by connecting the asymmetric U-shaped steel sheet pile. It shows 40.
• the asymmetric U-shaped steel sheet pile 30 has a main part consisting of a web part 32 and flange parts 34.
• the main part of the steel barbed body is U-shaped, and joints 36 and 38 on both sides.
• the shape is left-right asymmetric, for example, by making joint 36 as an inward joint and joint 38 as an outward joint, the convex sides of the cross-sectional shape are aligned in the same direction, such as the U-shaped side in the illustrated example. It is possible to combine on the straight line connecting 3 ends, that is, on the casting wall.
• the arm 37 is provided in the same direction as the casting normal (indicated by a three-dot chain line in the figure), and the joint where the joints 36 and 38 are coupled together is the arm 37 In addition, they are positioned on the same line as the innermost ridge 35 (shown by a dot-and-dash line in the figure) of the sheet pile wall 40.
• one joint 38 is formed so that the other joint 36 is formed inward outward with respect to the innermost edge 35 of the sheet pile wall 40 (which corresponds to the front surface on the digging side). In this way, they can be engaged with each other in such a manner that they do not protrude from the wall of the sheet pile wall 40. Further, on the outward facing joint 38 side, a projection 39 for restraining rotation in the joint portion is provided.
• the arm portion 37 can be chucked and driven. It becomes.
• the arm portion 37 extends parallel to the normal direction of the casting and is located on the same line as the joint portion, that is, on the fitting axis (indicated by a two-dot chain line in FIG. 7). That is, since the joint portion serving as the center of rotation generated at the time of placing is not deviated in a plane from the arm 37, the rotation of the steel sheet pile 30 due to the placing force acting on the chucking part 44 is prevented. You can
• the arm 37 of the asymmetric U-shaped steel sheet pile 30 according to the present invention has the action force in the direction of rotation in the ground.
• the resistance (shown by a black arrow in the figure) is shown against the white arrow in the figure, which has the effect of suppressing the rotation and twist of the U-shaped steel sheet pile in the underground.
• Figures 10 (a) to (c) show an example of a roll hole type that performs hot rolling of a U-shaped steel sheet pile with asymmetric left and right according to the present invention. Bore type before joint bending (K-3 ') And the joint bending holes (K-1 2 ', K-1') are shown.
• the hot bending method according to the present invention will be described based on FIG. 10 as follows.
• the upper roll (U.) and the lower roll (T. R.) are applied to the unsymmetrical steel sheet pile 30 obtained by carrying out hole rolling in the same manner as in the conventional method.
• the upper roll (U, R.) and the lower roll (L.) are the same. For example, bend the left joint with the provided hole type (K1 2 ').
• the deformation of the steel sheet pile 30 in the cross section perpendicular to the rolling direction is not symmetrical, and the rolling attitude before and after the roll bite is different, but the right joint bending is not performed. Unreasonable deformation near the bottom dead center is suppressed, and the rolling attitude, in particular, the attitude on the delivery side, becomes stable. Therefore, on the left side, a good joint shape is formed by bending, and on the right side, the hole-shaped (K-3 ') free shape is maintained.
• bending J is, for example, in the example of FIG. 6, until the end of the joint portion is raised (process ⁇ ).
• ⁇ the hole type in Fig. 10 (b)
• it means bending to such an extent that the instability of the rolling attitude falls within the allowable range.
• the left and right joint bending in the present invention may be carried out under conditions where the substantial bending on the left and the right are not simultaneously performed.
• FIGS. 11 and 12 show examples of the corner steel sheet pile 54 having the inward joint 50 and the outward joint 52 according to the present invention.
• Fig. 11 is a schematic cross-sectional view of the corner steel sheet pile 54 in which the inward joint 50 is processed 45 ° inward by welding
• Fig. 12 is a 45 ° incise processing of the outward joint 52 by welding.
• FIG. 5 is a schematic cross-sectional view of a corner steel bar 54. In each case the weld 56 is shown in black.
• the corner steel sheet pile 54 according to the present invention has one inward joint 36 (downward claw) and the other one has outward joint 38 (upward claw), and has a cross-sectional shape Based on an asymmetric U-shaped steel sheet pile 30 which can be aligned in the same direction and can be connected in a straight line, as shown in FIG. 7, FIG. 11 and FIG. One is bent 45 ° inward (downward) at the flat arm 37 of the steel sheet pile and the joint 55 of the joint.
• the boundary portion 55 is shown by a dotted line, which also corresponds to a welding portion in the case of manufacturing by a welding method.
• Fig. 13 (a) the corner steel sheet sheet according to the present invention, that is, the type in which the inward joint is bent inward, and the type in which the outward joint is bent inward are fitted at the joint portion. Indicates the situation in which the joint placement was conducted.
• Fig. 13 (b) is a partially enlarged view.
• FIGS. 13 (a) and 13 (b) when the two types of corner steel sheet piles are engaged with each other by bending them, the casting normals or fitting of the respective steel sheet piles are engaged.
• the alignment lines intersect at right angles and can be used as corners of steel sheet pile walls.
• Asymmetric U-shaped steel sheet piles with joints and joints with the other facing inward are manufactured by hot rolling, and then after cutting the joints between the joints and arms (dotted line in Fig. 7), The joint is disposed inward, and the joint and the cutting point of the arm are joined by welding.
• the joint and the cutting point of the arm are joined by welding.
• corner steel sheet of the present invention may be formed by bending inward one of the U-shaped steel sheet having an asymmetrical joint, so that it is manufactured by hot rolling or hot to warm forming. It is also possible.
• FIG. 14 exemplifies the case where the outward joint is bent inward by hot rolling in the method of manufacturing the corner steel sheet pile of the present invention, and the hole type roll is formed of the upper roll 60 and the lower roll 62.
• the material to be rolled is, for example, an asymmetric U-shaped steel bar 30 as shown in FIG. 7 formed in advance, while constraining the upper and lower surfaces of the steel sheet pile 30 with the upper and lower rolls 60, 62. It is formed in one pass by pressing the oriented joint 38 from above. The joint 38 is bent by being engaged with the hole-type roll.
• FIG. 15 exemplifies a case where an inward joint is bent inward by hot or warm forming processing as a method of manufacturing the corner steel sheet pile of the present invention, and as shown in FIG. 7 as a starting material.
• the roller guides 64 are arranged so that the upper and lower surfaces of the steel sheet pile 30 are restrained by the upper and lower rollers 66, 68, and the side surface of the outward joint 38 is restrained by the rollers 70 at the left end. It is formed in one pass by pressing the inward joint 36 from the upper side with La 66. It is desirable to provide such a forming mouthpiece 64 immediately behind the hot finish rolling machine of the asymmetric steel sheet pile 30 from the viewpoint of easy bending.
• construction can be carried out in the same manner as the non-symmetrical U-shaped steel sheet pile according to the present invention shown in FIG. 7 and the checking of the steel sheet by a casting machine. At times, it is possible to chuck the web or the arm, and if you can not do ordinary chucking like the conventional T-shaped or W-shaped steel sheet, you will not see any problems.
• the bending angle of the steel sheet pile wall (the angle at which the casting normal of the steel sheet pile intersects) is usually the largest, but it may be other than right angles depending on the construction site.
• the angle when bending one joint is changed by the roller guide disposed in the vicinity of the finish rolling mill or immediately after the finish rolling mill. It is also possible to manufacture corner steel sheet piles that can also be used for corners other than right angles.
• FIGS. 16 (a) and 16 (b) show an example in which the corner steel sheet pile 54 of the present invention is piling.
• Fig. 16 (a) shows the inward joint
• Fig. 16 (b) shows the corner steel sheet pile in which the outward joint is bent inward.
• the joints do not get dry at the time of piping, and therefore, the piping posture is unstable and does not cause a problem no matter how many sheets of piping.
• Fig. 17 shows the deformation of the rolled material in the hole type K-2 '(see Fig. 10) by 2D-FEM.
• the present invention is particularly effective to bend the asymmetric joint separately according to the present invention ⁇ , and to obtain a good joint shape over the entire length of the steel piece. Furthermore, the present invention is also effective in terms of the seizure resistance of the roll at the joint portion.
• the asymmetric steel sheet pile and corner steel sheet pile according to the present invention are manufactured by hot rolling and forming as described in connection with FIGS. 10 and 15, and the asymmetric U-shaped steel sheet pile shown in FIG. It was placed in combination with the corner steel sheet piles shown in Table 1 and made a wall of a basement for housing.
• a 250 mm thick x 700 mm wide continuous slab heated to 1280 C with a heating furnace is used to complete a break-down mill (rough rolling mill) consisting of double horizontal rolls, an intermediate mill, and so on. Hot rolling was performed with the three mills of the raised mill. Four, three and three hole types were placed on each mill roll. Through levers rolling with these three mills, the rolled material is finished into the shape of the asymmetrical U-shaped steel sheet pile shown in Fig.7.
• the t5 corner steel sheet sheet is manufactured by using a roller guide and a forming roller disposed behind the finishing mill to form a 45 ° bend on the outward joint by means of a bend.
• Two types of steel sheet piles are manufactured: corner steel sheet (type A, see Fig. 12) and inward-turned joint with a 45 ° angled inward facing type of corner steel sheet (type B, see Fig. 1 1). did.
• A-type corner steel sheet piles four A-type corner steel sheet piles, four B-type corner steel sheet piles, and 30 asymmetric U-shaped steel sheet piles that make up the wall body are manufactured by the method of the present invention.
• a pitting wall was constructed by placing a pit for use as a basement for housing.
• the construction results are shown in Figure 19.
• A-type and B-type core steel sheet piles are simply indicated by A and B, and the others were asymmetric steel sheet piles as shown in Fig. 7 ⁇ As can be seen from FIG. (2 of which were corner steel sheet piles) and 13 in the lateral direction (2 sheets of which were corner steel sheet piles), all of which could be driven smoothly without any construction problems.
• an asymmetric U-shaped steel sheet pile in which the joint portion and the flat arm portion can be disposed on the same plane as the innermost edge of the sheet wall is obtained, and such an asymmetric joint shape is provided. Even when producing a U-shaped steel sheet pile by hot rolling, it is possible to obtain a good joint shape without unstable rolling position and incomplete joint formation.
• the asymmetric U-shaped steel sheet piles and the corner steel sheet sheets according to the present invention can be continuously cast in the same direction without causing problems of checking at the time of casting and transportation of the steel sheet piles and storage problems. Since it is a feasible steel sheet pile, it is effective in labor saving and construction cost reduction by improvement of construction efficiency. In addition, when manufacturing a corner steel sheet, it is possible to cut off a part of the asymmetric U-shaped steel sheet and re-welding it, so that it can be diverted to the corner steel sheet without any major equipment modifications. This is an invention with extremely high industrial value, as it can be manufactured only by partially modifying the rolling rolls and adding roller guides.

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