Steel plate fixing method and steel plate fixing structure

Abstract

To provide a steel plate fixing method and a steel plate fixing structure for avoiding upward welding when fixing a steel plate to the upper end of an H-steel pile.SOLUTION: In a steel plate fixing method for fixing a steel plate 7 for forming a smooth surface at an upper end of an existing H-steel pile 5, a protruding portion 25 that protrudes upward from other portions by a protruding amount smaller than a plate thickness of the steel plate 7 at an upper end surface 5a of the H-steel pile 5 is formed at an upper end of a web 23 of the H-steel pile 5. A through hole 31 into which the protruding portion 25 is inserted is formed so as to penetrate the steel plate 7 in a plate thickness direction. Fillet welding is applied to corners of a peripheral edge of an upper end surface 25a of the protruding portion 25 inserted into the through hole 31 and an inside surface 31a of the through hole 31.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a steel plate fixing method and a steel plate fixing structure. [Background technology]

[0002] Conventionally, when constructing a structure on piles, a horizontal steel plate is first fixed to the top surface of the pile. The top surface of the steel plate is smooth, and the weight of the structure acts evenly on the pile by supporting the structure on the smooth top surface. For example, the following Patent Document 1 describes a technique for fixing a base plate by welding to the top surface of a steel pipe pile when connecting a steel column of a building to the steel pipe pile driven into the ground. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4313181 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when welding a steel plate to the top end of a pile, for example, a worker must get under the steel plate and weld the bottom surface of the steel plate to the top surface of the pile in an upward position. Such upward welding is difficult to perform and may result in inferior welding quality compared to downward welding. Therefore, the present invention aims to provide a steel plate fixing method and steel plate fixing structure that avoids upward welding when fixing a steel plate to the top end of an H-shaped steel pile. [Means for solving the problem]

[0005] The steel plate fixing method of the present invention is a steel plate fixing method for fixing a steel plate to form a smooth surface on the upper end of an existing H-shaped steel pile, in which a protruding portion protruding upward from other portions by an amount smaller than the plate thickness of the steel plate is formed at the upper end of the web of the H-shaped steel pile on the upper end surface of the H-shaped steel pile, a through hole into which the protruding portion is inserted is formed in the steel plate so as to penetrate it in the plate thickness direction, and fillet welding is applied to the corners between the peripheral portion of the upper end surface of the protruding portion inserted into the through hole and the inner surface of the through hole.

[0006] The steel plate may have a pair of parallel side peripheral surfaces positioned at a distance smaller than the width of the flanges of the H-shaped steel pile in the opposing direction and arranged along the upper end surface of each flange, and fillet welding may be applied to the corners between the upper end surface of the flange and the side peripheral surface on each side peripheral surface.

[0007] The steel plate fixing structure of the present invention is a steel plate fixing structure for fixing a steel plate to form a smooth surface on the upper end of an existing H-shaped steel pile, and a protruding portion is formed at the upper end of the web of the H-shaped steel pile, protruding upward from other portions at the upper end surface of the H-shaped steel pile by an amount of protrusion smaller than the plate thickness of the steel plate, and the steel plate is formed with a through hole into which the protruding portion is inserted so as to penetrate in the plate thickness direction, and fillet welding is applied to the corners of the peripheral portion of the upper end surface of the protruding portion inserted into the through hole and the inner surface of the through hole.

[0008] The steel plate may have a pair of parallel side peripheral surfaces positioned at a distance smaller than the width of the flanges of the H-shaped steel pile in the opposing direction and arranged along the upper end surface of each flange, and fillet welding may be applied to the corners between the upper end surface of the flange and the side peripheral surface on each side peripheral surface. Effect of the Invention

[0009] According to the present invention, it is possible to provide a steel plate fixing method and a steel plate fixing structure that avoid upward welding when fixing a steel plate to the upper end of an H-shaped steel pile. [Brief description of the drawings]

[0010] [Figure 1]1(a) and 1(b) are cross-sectional views showing the procedure of construction to which the steel plate fixing method and steel plate fixing structure of the present embodiment are applied. [Diagram 2] 2(a) and 2(b) are cross-sectional views showing the construction procedure following FIG. 1. [Diagram 3] 1A is an exploded perspective view of a steel plate fixing structure of the present embodiment, and FIG. [Figure 4] FIG. 4(a) is a cross-sectional view taken along line IVa-IVa of the steel plate fixing structure shown in FIG. 3, and FIG. 4(b) is a cross-sectional view taken along line IVb-IVb thereof. [Diagram 5] 1A and 1B are perspective views showing a steel plate fixing structure according to a reference embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of a steel plate fixing method and a steel plate fixing structure according to the present invention will be described in detail with reference to the drawings. The steel plate fixing method and the steel plate fixing structure of this embodiment are used in construction work around a railway as shown in Fig. 1 and Fig. 2. The track 1 shown in Fig. 1 and Fig. 2 extends in a direction perpendicular to the paper surface of the figure. In this construction work, as shown in Fig. 1(a), earth-retaining piles are driven into the ground G on the side of the track 1 to form earth-retaining walls 3, 3 extending parallel to the track 1. Note that such earth-retaining walls 3, 3 and structures to be constructed between the earth-retaining walls 3, 3, which will be described later, are provided with the same structure on both the left and right sides of the track 1, and therefore only one of them is illustrated in Fig. 1 and Fig. 2.

[0012] Furthermore, a plurality of H-shaped steel piles 5 are driven between the retaining walls 3, 3. The H-shaped steel piles 5 are arranged in a direction parallel to the track 1. Then, as shown in FIG. 1(b), the space between the retaining walls 3, 3 is excavated, and the upper end of each H-shaped steel pile 5 is exposed in the excavation space J. After that, as shown in FIG. 2(a), the upper end of each H-shaped steel pile 5 is cut to an appropriate length in the excavation space J, and a horizontal steel plate 7 is fixed to the upper end surface of each cut H-shaped steel pile 5. Furthermore, a girder support beam 9 is installed so as to span the upper surface of the steel plate 7 on the plurality of H-shaped steel piles 5. The girder support beam 9 is composed of an H-shaped steel extending parallel to the track 1.

[0013] Furthermore, a hairpin girder 11 is installed on the girder support beams 9. The hairpin girder 11 is installed so as to span between the girder support beams 9 installed on the left and right sides of the track 1. The hairpin girder 11 is made of H-shaped steel extending in a direction perpendicular to the track 1 directly below the track 1, and multiple hairpin girder 11 are arranged in a direction parallel to the track 1. The track 1 is temporarily supported by a temporary support structure 13 including multiple hairpin girders 11 like this. Then, the ground directly below the temporarily supported track 1 is excavated and the necessary construction work is carried out.

[0014] The steel plate fixing method and steel plate fixing structure of this embodiment are a steel plate fixing method and steel plate fixing structure for fixing a steel plate 7 to the upper end surface of the above-mentioned H steel pile 5. By fixing the steel plate 7 to the upper end surface of the H steel pile 5 in this manner, a smooth surface (i.e., the upper surface of the steel plate 7) is formed on which the girder support beam 9 is installed. Then, by installing the girder support beam 9 on the smooth surface of this steel plate 7, the force acting from the girder support beam 9 is transmitted evenly to the entire H steel pile 5.

[0015] The steel plate fixing method and steel plate fixing structure 17 for fixing the steel plate 7 to the H steel pile 5 as described above will be described with reference to Figs. 3 and 4. Fig. 3(a) is an exploded perspective view showing the H steel pile 5 and the steel plate 7 in the steel plate fixing structure 17, and Fig. 3(b) is a perspective view of the steel plate fixing structure 17. Fig. 4(a) is a IVa-IVa cross-sectional view of the steel plate fixing structure 17 shown in Fig. 3, and Fig. 4(a) is a IVb-IVb cross-sectional view thereof. In each drawing, the features of the steel plate fixing method and the steel plate fixing structure 17 may be exaggerated, so the shapes and dimensional ratios of the components shown in each drawing may not match the actual ones, and the shapes and dimensional ratios of the components may not match between each drawing. In the following, as shown in the drawings, the extension direction of the H steel pile 5 is the Z direction, the direction perpendicular to the flange 21 of the H steel pile 5 is the Y direction, and the direction perpendicular to the web 23 of the H steel pile 5 is the X direction.

[0016] In the steel plate fixing method of this embodiment, the upper end surface 5a of the H steel pile 5 is processed into a predetermined shape. Specifically, as shown in FIG. 3(a), a protruding portion 25 is formed on the upper end surface of the web 23. The protruding portion 25 spreads over the entire width of the web 23 in the X direction, extends in the Y direction a length slightly shorter than the length of the web 23, and is located in the center of the upper end surface of the web 23 in the Y direction. In the upper end surface 5a, the protruding portion 25 protrudes upward from other parts, and the protruding amount of the protruding portion 25 from other parts is smaller than the plate thickness of the steel plate 7. For example, the protruding amount is about 10 mm smaller than the plate thickness of the steel plate 7. In order to form such a protruding portion 25, a process may be performed in which the parts other than the protruding portion 25, including the upper end of the flange 21, are cut off from the upper end of the H steel pile 5.

[0017] In addition, in the steel plate fixing method of this embodiment, the following steel plate 7 is manufactured. In plan view, the outer shape of the steel plate 7 is a rectangle slightly smaller than the H steel pile 5. Specifically, the X-direction length of the steel plate 7 is approximately the same as that of the H steel pile 5, and the Y-direction length of the steel plate 7 is shorter than that of the H steel pile 5 by the thickness of the flange 21. The rectangular plate-like steel plate 7 is, strictly speaking, a rectangular parallelepiped, and has four vertical side peripheral surfaces 7p, 7q, 7r, and 7s. In addition, a through hole 31 is formed in the center of the steel plate 7, penetrating the steel plate 7 in the plate thickness direction. The through hole 31 is formed at a position and in a shape corresponding to the protruding portion 25 of the H steel pile 5, and is a rectangle long in the Y direction in plan view. The dimensions of the through hole 31 in the X and Y directions are slightly larger than the protruding portion 25 (for example, about 1 mm).

[0018] For example, the H-shaped steel pile 5 has an X-direction width of 405 mm, a Y-direction width of 414 mm, a flange thickness of 28 mm, and a web thickness of 18 mm. For example, the protruding portion 25 has a Y-direction length of 324 mm and a height of 25 mm. For example, the steel plate 7 has an X-direction width of 405 mm, a Y-direction width of 386 mm, and a plate thickness of 35 mm. Although one example of the size of the H-shaped steel pile 5 and the steel plate 7 has been given above, the present invention is not limited to this example of size.

[0019] Next, in the steel plate fixing method of this embodiment, as shown in Figures 3(b), 4(a), and 4(b), the steel plate 7 is placed on the upper end surface 5a of the H-shaped steel pile 5, and the protruding portion 25 is inserted into the through hole 31. The upper end surface 25a of the protruding portion 25 is embedded in the through hole 31 at a position lower than the upper surface 7a of the steel plate 7, and is exposed to the upper surface side through the through hole 31. The other parts of the upper end surface 5a of the H-shaped steel pile 5 (the upper end surface 21a of the flange 21, etc.) abut against the lower surface of the steel plate 7.

[0020] Based on the dimensional relationship that the Y-direction length of the steel plate 7 is shorter than that of the H-shaped steel pile 5 by the thickness of the flange 21, the two side peripheral surfaces 7p, 7r of the steel plate 7 are positioned so as not to protrude in the Y-direction from a position directly above the upper end surface 21a of the flange 21. The side peripheral surfaces 7p, 7r are a pair of parallel side peripheral surfaces positioned apart from each other with a distance smaller than the width in the opposing direction (Y-direction width) of the flange 21 of the H-shaped steel pile 5. The side peripheral surfaces 7p, 7r of the steel plate 7 extend in the X-direction along the flange upper end surface 21a, and are perpendicular to the flange upper end surface 21a at the center of the flange upper end surface 21a in the Y direction.

[0021] Next, in the steel plate fixing method of this embodiment, the steel plate 7 is fixed to the upper end of the H-shaped steel pile 5 by welding. Specifically, fillet welding is performed on the corner between the peripheral portion of the upper end surface 25a of the protruding portion 25 inserted into the through hole 31 and the inner side surface 31a of the through hole 31. As shown in Figs. 3(a) and (b), a weld bead 35 is formed in a rectangular ring shape along the corner. As described above, since the upper end surface 25a of the protruding portion 25 is exposed to the upper surface side through the through hole 31, this fillet welding can be performed downward by inserting a welding tool into the through hole 31 from above.

[0022] Furthermore, fillet welding is performed on the corner between the upper end surface 21a of one flange 21 and the side peripheral surface 7p, and similarly, fillet welding is performed on the corner between the upper end surface 21a of the other flange 21 and the side peripheral surface 7r. As shown in Figs. 3(a) and (b), linear weld beads 37 extending in the X direction are formed along the above-mentioned corners. This fillet welding can also be performed from above downward. The welding between the H-shaped steel pile 5 and the steel plate 7 as described above is performed by, for example, arc welding, gas welding, or the like. In Fig. 2(b), the weld beads 35 and 37 are omitted from illustration.

[0023] The above-mentioned steel plate fixing method completes the steel plate fixing structure 17 shown in Fig. 3(b), Fig. 4(a) and Fig. 4(b). In the completed steel plate fixing structure 17, a protruding portion 25 that protrudes upward from other portions with a protruding amount smaller than the plate thickness of the steel plate 7 is formed in the upper end surface 5a of the existing H steel pile 5 at the upper end center of the web 23 of the H steel pile 5, and the steel plate 7 is formed with a through hole 31 into which the protruding portion 25 is inserted so as to penetrate in the plate thickness direction, and fillet welding is performed at the corners between the peripheral portion of the upper end surface 25a of the protruding portion 25 inserted into the through hole 31 and the inner side surface 31a of the through hole 31. The steel plate 7 has a pair of parallel side peripheral surfaces 7p, 7r that are spaced apart at an interval smaller than the width of the flanges 21 of the H steel pile 5 in the facing direction (Y direction), and the side peripheral surfaces 7p, 7r are arranged along the upper end surfaces 21a of each flange 21. Then, fillet welding is applied to the corner between the upper end surface 21a of one flange 21 and the side peripheral surface 7p, and fillet welding is applied to the corner between the upper end surface 21a of the other flange 21 and the side peripheral surface 7r.

[0024] According to the steel plate fixing method and steel plate fixing structure 17 of the present embodiment described above, the steel plate 7 can be fixed to the H steel pile 5 by downward welding as described above, and upward welding work can be avoided. Therefore, downward welding improves workability and improves welding quality. If the steel plate 7 is fixed to the H steel pile 5 by upward welding, a worker needs to enter below the steel plate 7 in the excavation space J shown in FIG. 2(a) to perform welding work. In that case, it is necessary to expand the excavation space J to a deeper position to secure the working space, and the amount of excavation increases. In many cases, construction work around the railway as in this embodiment needs to be carried out in a short time at night, but by making it possible to weld the steel plate 7 downward to the H steel pile 5, the amount of excavation can be reduced and workability can be improved, thereby shortening the work time.

[0025] As a method of fixing the steel plate 7 to the H-shaped steel pile 5 from above the steel plate 7, bolt fastening may be used. However, in this case, it is necessary to form a counterbore portion for accommodating the bolt head on the upper surface 7a of the steel plate 7 so that the bolt head does not protrude from the upper surface 7a of the steel plate 7. In contrast, in the steel plate fastening method and steel plate fastening structure 17 of this embodiment, the protruding portion 25 related to the welding between the H-shaped steel pile 5 and the steel plate 7 is buried in the through hole 31 without protruding upward from the upper surface 7a of the steel plate 7, so that the smoothness of the upper surface 7a of the steel plate 7 is easily ensured. In addition, the work effort is less than that of bolt fastening.

[0026] [Reference form] As a structure in which a steel plate is fixed to an H-shaped steel pile 5 by downward welding, a steel plate fixing structure 51 shown in Fig. 5(a) and (b) is also considered. In the following description, components that are the same as or equivalent to those in the above-mentioned embodiment are given the same reference numerals, and duplicated descriptions are omitted. In the steel plate fixing structure 51 of this reference embodiment, the upper end surface 5a of the H-shaped steel pile 5 is formed flat. Two rectangular steel plates 57 of the same size are prepared as the steel plates to be welded to the upper end surface 5a. The Y-direction length of the steel plate 57 is shorter than that of the H-shaped steel pile 5 by the thickness of the flange 21. The X-direction length of the steel plate 57 is slightly shorter than half the X-direction length of the flange 21.

[0027] The steel plate 57 has four side peripheral surfaces 57p, 57q, 57r, and 57s. When one steel plate 57 is placed on the upper end surface 5a of the H steel pile 5, the side peripheral surface 57p is located along one flange upper end surface 21a, the side peripheral surface 57r is located along the other flange upper end surface 21a, and the side peripheral surface 57q is located along the web upper end surface 23a. Then, fillet welding is performed on the corner where the side peripheral surface 57p and one flange upper end surface 21a intersect at right angles, the corner where the side peripheral surface 57r and the other flange upper end surface 21a intersect at right angles, and the corner where the side peripheral surface 57q and the web upper end surface 23a intersect at right angles. This fillet welding can be performed downward from above the steel plate 57.

[0028] The other steel plate 57 is welded and fixed to the upper end surface 5a of the H-shaped steel pile 5 in a symmetrical arrangement to the above steel plate 57 in the same manner. The broken line W in Fig. 5(a) indicates the welding location. In reality, a weld bead is formed along the broken line W, but the weld bead is not shown in Figs. 5(a) and (b). A gap 58 that is slightly narrower than the thickness of the web 23 is formed on the web upper end surface 23a between the two steel plates 57. Therefore, downward welding can be performed by inserting a welding tool through the gap 58 to weld the corner where the side peripheral surface 57s of the other steel plate 57 and the web upper end surface 23a intersect at right angles.

[0029] In this way, the steel plate fixing structure 51 of the reference embodiment also allows the steel plates 57, 57 to be fixed to the H-shaped steel pile 5 by downward welding. However, with the steel plate fixing structure 51, the height and inclination of the upper surfaces 57a, 57a of the two steel plates may differ from each other, making it difficult to ensure the smoothness of the upper surfaces 57a, 57a. From this perspective, the steel plate fixing structure 17 of the above-mentioned embodiment (FIG. 2) can be said to be superior to the steel plate fixing structure 51 in that it is easy to ensure the smoothness of the upper surface 7a of the steel plate 7.

[0030] The present invention can be implemented in various forms including the above-described embodiment and various modifications and improvements based on the knowledge of those skilled in the art. In addition, it is possible to configure modified examples by utilizing the technical matters described in the above-described embodiment. The configurations of each embodiment may be used in appropriate combination.

[0031] For example, in the embodiment, fillet welding (hereinafter referred to as "first welding") is performed on the corners between the periphery of the upper end surface 25a of the protruding portion 25 inserted into the through hole 31 and the inner surface 31a of the through hole 31, and further, fillet welding (hereinafter referred to as "second welding") is performed on the corners between the upper end surface 21a of each flange 21 and the side peripheral surfaces 7p, 7r. However, it is not essential that both the first welding and the second welding are performed, and one of the first welding and the second welding may be omitted. For example, after the first welding is performed, each flange 21 and the steel plate 7 may be joined by another method instead of the second welding. [Explanation of symbols]

[0032] 5...H steel pile, 5a...top end surface, 7...steel plate, 7a...top surface (smooth surface), 7p, 7r...side peripheral surface, 17...steel plate fixing structure, 21...flange, 21a...flange top end surface, 23...web, 25...protrusion part, 25a...top end surface, 31...through hole, 31a...inner surface.

Claims

1. A method for fixing a steel plate to an upper end of an existing H steel pile to form a smooth surface, comprising: A protruding portion protruding upward from other portions at the upper end surface of the H steel pile with a protruding amount smaller than the plate thickness of the steel plate is formed at the upper end of the web of the H steel pile, The steel plate has a through hole into which the protruding portion is inserted, the through hole penetrating the steel plate in a plate thickness direction, A steel plate fixing method, in which fillet welding is applied to a corner portion between a peripheral portion of an upper end surface of the protruding portion inserted into the through hole and an inner surface of the through hole.

2. The H-shaped steel pile has a pair of flanges, The steel plate has a pair of parallel peripheral side surfaces, The circumferential surfaces of the steel plates are spaced apart at an interval smaller than the width of the H steel pile in the opposing direction of the flanges, Each of the circumferential surfaces is disposed along a respective upper end surface of each of the flanges; The steel plate fastening method according to claim 1 , wherein, in each of the side peripheral surfaces, fillet welding is performed at a corner between the upper end surface of the flange and the side peripheral surface.

3. A steel plate fixing structure for fixing a steel plate to the upper end of an existing H steel pile to form a smooth surface, A protruding portion is formed at the upper end of the web of the H steel pile, the protruding portion protruding upward from other portions at an upper end surface of the H steel pile with a protruding amount smaller than the plate thickness of the steel plate, The steel plate has a through hole into which the protruding portion is inserted, the through hole penetrating the steel plate in a plate thickness direction, A steel plate fixing structure, in which fillet welding is applied to the corners of the peripheral portion of the upper end surface of the protruding portion inserted into the through hole and the inner surface of the through hole.

4. The H-shaped steel pile has a pair of flanges, The steel plate has a pair of parallel peripheral side surfaces, The circumferential surfaces of the steel plates are spaced apart at an interval smaller than the width of the H steel pile in the opposing direction of the flanges, Each of the circumferential surfaces is disposed along a respective upper end surface of each of the flanges; The steel plate fixing structure according to claim 3 , wherein a fillet weld is applied to a corner portion between the upper end surface of the flange and the side peripheral surface of each of the side peripheral surfaces.

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