JP2023068438A - Steel plate fixing method, and steel plate fixing structure - Google Patents

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 The present invention relates to a steel plate fixing method and a steel plate fixing structure.

Conventionally, when constructing a structure on a pile, first, a horizontal steel plate is fixed to the upper end face of the pile. The upper surface of the steel plate is a smooth surface, and by supporting the structure on the smooth upper surface, the weight of the structure acts evenly on the piles. For example, Patent Literature 1 below describes a technique of fixing a base plate by welding to the upper end surface of a steel pipe pile when connecting a steel column of a building to a steel pipe pile driven into the ground.

Patent No. 4313181

However, when welding the steel plate to the upper end of the pile, for example, a worker enters under the steel plate and welds the lower surface of the steel plate and the upper end surface of the pile upward. Such upward welding is poor in workability, and the welding quality may be inferior to that of downward welding or the like. Therefore, an object of the present invention is 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 steel pile.

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 steel pile, and in the upper end surface of the H steel pile, a protrusion smaller than the plate thickness of the steel plate A protruding portion that protrudes upward from another portion by an amount is formed at the upper end of the web of the H steel pile, and a through hole into which the protruding portion is inserted is formed in the steel plate so as to penetrate in the plate thickness direction. Fillet welding is applied to the corners of the peripheral edge of the upper end surface of the protruding portion inserted into the through hole and the inner surface of the through hole.

The steel plate has a pair of parallel side peripheral surfaces located at intervals smaller than the width of the flanges of the H steel pile in the opposing direction and arranged along the upper end surface of each flange. A fillet weld may be applied to the corner between the upper end surface and the side peripheral surface of the flange.

The steel plate fixing structure of the present invention is a steel plate fixing structure that fixes a steel plate to form a smooth surface on the upper end of an existing H steel pile, and the upper end surface of the H steel pile protrudes smaller than the plate thickness of the steel plate. A protruding portion that protrudes upward from another portion by a certain amount is formed at the upper end of the web of the H steel pile, and a through hole into which the protruding portion is inserted is formed in the steel plate so as to penetrate in the plate thickness direction. Fillet welding is applied to the corners of the peripheral edge of the upper end surface of the projecting portion inserted into the through-hole and the inner surface of the through-hole.

The steel plate has a pair of parallel side peripheral surfaces located at intervals smaller than the width of the flanges of the H steel pile in the opposing direction and arranged along the upper end surface of each flange. Fillet welding may be applied to the corners between the upper end surface and the side peripheral surface of the flange.

ADVANTAGE OF THE INVENTION According to this invention, when fixing a steel plate to the upper end of H steel pile, the steel plate fixing method and steel plate fixing structure which avoid upward welding can be provided.

(a) and (b) are cross-sectional views showing a construction procedure to which the steel plate fixing method and steel plate fixing structure of the present embodiment are applied. (a), (b) is sectional drawing which shows the procedure of construction following FIG. (a) is an exploded perspective view of the steel plate fixing structure of this embodiment, and (b) is a perspective view thereof. (a) is an IVa-IVa sectional view of the steel plate fixing structure shown in FIG. 3, and (b) is an IVb-IVb sectional view thereof. (a) and (b) are perspective views showing a steel plate fixing structure according to a reference embodiment.

EMBODIMENT OF THE INVENTION Hereafter, embodiment of the steel plate fixing method and steel plate fixing structure which concern on this invention is described in detail, referring drawings. The steel plate fixing method and steel plate fixing structure of this embodiment are used in the construction work around the railway shown in FIGS. 1 and 2 . The track 1 shown in FIGS. 1 and 2 extends in a direction perpendicular to the plane of the drawing. In this construction, as shown in FIG. 1(a), retaining walls 3, 3 extending parallel to the track 1 are formed by driving retaining piles into the ground G on the side of the track 1. As shown in FIG. The earth retaining walls 3, 3 and the structures 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, so one of them is shown in FIGS. only are shown.

Further, a plurality of H steel piles 5 are driven between the earth retaining walls 3,3. H 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 ends of the H steel piles 5 are exposed in the excavated space J. As shown in FIG. After that, as shown in FIG. 2( a ), the upper end of each H steel pile 5 is cut to an appropriate length in the excavation space J, and the horizontal steel plate on the upper end face of each H steel pile 5 after cutting 7 are fixed respectively. Furthermore, a girder support beam 9 is installed so as to bridge over the upper surfaces of the steel plates 7 on the plurality of H steel piles 5 . The girder support beam 9 is made of H steel extending parallel to the track 1 .

Furthermore, a hairpin girder 11 is installed on the girder receiving beam 9. - 特許庁The hairpin girder 11 is installed so as to bridge between the girder receiving beams 9 respectively installed on the left and right sides of the track 1. - 特許庁The hairpin girder 11 is made of H steel extending in a direction perpendicular to the track 1 right under the track 1 , and a plurality of hairpin girder 11 are arranged in a direction parallel to the track 1 . The track 1 is temporarily supported by the temporary support structure 13 including such a plurality of hairpin beams 11 . Then, the ground immediately below the temporarily received track 1 is excavated and necessary construction work is carried out.

The steel plate fixing method and steel plate fixing structure of the present embodiment are a steel plate fixing method and steel plate fixing structure for fixing the steel plate 7 to the upper end face of the H steel pile 5 described above. By fixing the steel plate 7 to the upper end surface of the H steel pile 5 in this way, a smooth surface (that is, the upper surface of the steel plate 7) for installing the girder support beam 9 is formed. By installing the girder receiving beam 9 on the smooth surface of the steel plate 7, the force acting from the girder receiving beam 9 is evenly transmitted to the entire H steel pile 5.

A steel plate fixing method and a 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(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 sectional view of the steel plate fixing structure 17 shown in FIG. 3, and FIG. 4(a) is an IVb-IVb sectional view thereof. In each drawing, the characteristics of the steel plate fixing method and the steel plate fixing structure 17 may be exaggerated. Even between them, the shapes and dimensional ratios of the components may not match. Below, as shown in the figure, the extending 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. direction.

In the steel plate fixing method of the present embodiment, the upper end surface 5a of the H steel pile 5 is processed into a predetermined shape. Specifically, as shown in FIG. 3A, a projecting portion 25 is formed on the upper end surface of the web 23 . The projecting portion 25 spreads over the entire width of the web 23 in the X direction, extends in the Y direction with a length slightly shorter than the length of the web 23, and is positioned at the center of the upper end surface of the web 23 in the Y direction. ing. The protruding portion 25 protrudes higher than other portions in the upper end surface 5 a , and the amount of protrusion of the protruding portion 25 from the other portion is smaller than the plate thickness of the steel plate 7 . For example, the protrusion amount is smaller than the plate thickness of the steel plate 7 by about 10 mm. In order to form such a protruding portion 25 , processing may be performed to cut off portions other than the protruding portion 25 including the upper end portion of the flange 21 from the upper end portion of the H-steel pile 5 .

Further, in the steel plate fixing method of the present 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 substantially the same as the H-steel pile 5, and the Y-direction length of the steel plate 7 is shorter than the H-steel pile 5 by the thickness of the flange 21 . Strictly speaking, the rectangular plate-shaped steel plate 7 is a rectangular parallelepiped, and thus has four vertical side peripheral surfaces 7p, 7q, 7r, and 7s. A through hole 31 is formed in the center of the steel plate 7 so as to penetrate the steel plate 7 in the plate thickness direction. The through hole 31 is formed at a position and shape corresponding to the protruding portion 25 of the H steel pile 5 and has a rectangular shape elongated in the Y direction in plan view. The dimensions of the through hole 31 in the X direction and the Y direction are slightly larger than the projecting portion 25 (for example, about 1 mm).

For example, the H 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 projecting portion 25 has a Y-direction length of 324 mm and a height of 25 mm. For example, the steel plate 7 has a width of 405 mm in the X direction, a width of 386 m in the Y direction, and a thickness of 35 mm. Although an example of the size of the H-steel pile 5 and the steel plate 7 is mentioned above, the present invention is not limited to this size example.

Subsequently, in the steel plate fixing method of the present embodiment, the steel plate 7 is placed on the upper end surface 5a of the H steel pile 5 as shown in FIGS. and the projecting portion 25 is inserted into the through hole 31 . An upper end surface 25 a of the protruding portion 25 is buried in the through hole 31 at a position lower than the upper surface 7 a of the steel plate 7 and exposed to the upper surface side through the through hole 31 . Other portions of the upper end surface 5 a of the H steel pile 5 (such as the upper end surface 21 a of the flange 21 ) come into contact with the lower surface of the steel plate 7 .

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

Subsequently, in the steel plate fixing method of the present embodiment, the steel plate 7 is fixed to the upper end portion of the H steel pile 5 by welding. Specifically, fillet welding is applied to corners between the peripheral edge portion of the upper end surface 25a of the projecting portion 25 inserted into the through hole 31 and the inner surface 31a of the through hole 31 . As shown in FIGS. 3(a) and 3(b), a rectangular annular weld bead 35 is formed along the corners. Since the upper end surface 25a of the projecting portion 25 is exposed on the upper surface side through the through hole 31 as described above, this fillet welding can be performed downward by inserting a welding tool into the through hole 31 from above. .

Furthermore, fillet welding is applied to the corner between the upper end surface 21a of one flange 21 and the side peripheral surface 7p. Welding is applied. As shown in FIGS. 3A and 3B, linear weld beads 37 extending in the X direction are formed along the corners. This fillet weld can also be performed from the top down. The welding of the H steel pile 5 and the steel plate 7 as described above is performed by arc welding, gas welding, or the like, for example. In FIG. 2B, illustration of the weld beads 35 and 37 is omitted.

By the steel plate fixing method described above, the steel plate fixing structure 17 shown in FIGS. 3(b), 4(a) and 4(b) is completed. In the completed steel plate fixing structure 17, on the upper end surface 5a of the existing H steel pile 5, the protruding portion 25 that protrudes upward from the other portion by a protrusion amount smaller than the plate thickness of the steel plate 7 is the web 23 of the H steel pile 5. A through hole 31 into which the projecting portion 25 is inserted is formed in the steel plate 7 so as to penetrate in the plate thickness direction. Fillet welding is applied to the corners of the peripheral edge of the end face 25a and the inner side surface 31a of the through hole 31 . In addition, the steel plate 7 has a pair of parallel side peripheral surfaces 7p and 7r that are located at a distance smaller than the width of the flange 21 of the H steel pile 5 in the opposite direction (Y direction). 7p and 7r are arranged along the upper end surface 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. It is

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. can be done. 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, it is necessary for the operator to enter below the steel plate 7 in the excavation space J shown in FIG. . In this case, it is necessary to widen the excavation space J to a deeper position in order to secure the work space, and the amount of excavation increases. In many cases, the construction around the railway like this embodiment needs to be executed in a short time at night. The work time can be shortened by reducing the amount and improving workability.

As a method for fixing the steel plate 7 to the H steel pile 5 from above the steel plate 7, it is possible to use bolting. However, in this case, it is necessary to form a counterbore for receiving 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. On the other hand, in the steel plate fixing method and steel plate fixing structure 17 of the present embodiment, the protruding portion 25 related to welding between the H steel pile 5 and the steel plate 7 does not protrude upward from the upper surface 7a of the steel plate 7, and the through hole 31 The smoothness of the upper surface 7a of the steel plate 7 is easily ensured because the steel plate 7 is buried inside. In addition, the labor for construction is small compared to bolting.

[Reference form]
As a structure for fixing the steel plate to the H steel pile 5 by downward welding, a steel plate fixing structure 51 shown in FIGS. In the following description, constituent elements that are the same as or equivalent to the constituent elements in the above-described embodiment are denoted by the same reference numerals, and overlapping explanations are omitted. In the steel plate fixing structure 51 of this reference form, the upper end face 5a of the H steel pile 5 is formed flat. Two rectangular steel plates 57 of the same size are prepared as steel plates to be welded to the upper end face 5a. The Y-direction length of the steel plate 57 is shorter than the H 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 .

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 positioned along one flange upper end surface 21a, and the side peripheral surface 57r is positioned along the other flange upper end surface 21a. The side peripheral surface 57q is located along the web upper end surface 23a. A corner portion where the side peripheral surface 57p and one flange upper end surface 21a are perpendicular to each other, a corner portion where the side peripheral surface 57r and the other flange upper end surface 21a are perpendicular to each other, and a side peripheral surface 57q and the web upper end surface 23a are formed. A fillet weld is applied to each orthogonal corner. This fillet welding can be performed from above the steel plate 57 downward.

The other steel plate 57 is also welded and fixed onto the upper end face 5a of the H steel pile 5 in a symmetrical arrangement with the steel plate 57 in the same manner as described above. A dashed line W in FIG. 5(a) indicates the welding location. Although a weld bead is actually formed along the dashed line W, illustration of the weld bead is omitted in FIGS. 5(a) and 5(b). A gap 58 slightly narrower than the thickness of the web 23 is formed between the two steel plates 57 on the web upper end surface 23a. Therefore, downward welding is also possible by inserting a welding tool through the gap 58 for welding the corner portion where the side peripheral surface 57s of the other steel plate 57 and the web upper end surface 23a are perpendicular to each other.

Thus, the steel plate fixing structure 51 of the reference embodiment can also fix the steel plates 57, 57 to the H steel pile 5 by downward welding. However, according to the steel plate fixing structure 51, the height and inclination of the upper surfaces 57a, 57a of the two steel plates may deviate from each other, and it is not easy to ensure the smoothness of the upper surfaces 57a, 57a. From this point of view, it can be said that the steel plate fixing structure 17 ( FIG. 2 ) of the above-described embodiment is superior to the steel plate fixing structure 51 because the smoothness of the upper surface 7 a of the steel plate 7 can be easily ensured.

The present invention can be embodied in various forms with various modifications and improvements based on the knowledge of those skilled in the art, including the embodiment described above. Moreover, it is also possible to configure a modified example using the technical matters described in the above-described embodiments. You may use it, combining the structure of each embodiment etc. suitably.

For example, in the embodiment, fillet welding (hereinafter referred to as “first welding”) is performed at the corners of the peripheral edge portion of the upper end surface 25a of the projecting portion 25 inserted into the through-hole 31 and the inner surface 31a of the through-hole 31 . Further, fillet welding (hereinafter referred to as "second welding") is performed at 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 technique instead of the second welding.

5... H steel pile 5a... Upper end surface 7... Steel plate 7a... Upper surface (smooth surface) 7p, 7r... Side peripheral surface 17... Steel plate fixing structure 21... Flange 21a... Flange upper end surface 23... Web 25 Protruding portion 25a Upper end surface 31 Through hole 31a Inner surface.

Claims (4)

A steel plate fixing method for fixing a steel plate to form a smooth surface on the upper end of an existing H steel pile,
In the upper end surface of the H steel pile, a protruding portion that protrudes upward from another portion with a protrusion amount smaller than the plate thickness of the steel plate is formed at the upper end of the web of the H steel pile,
A through-hole into which the projecting portion is inserted is formed in the steel plate so as to penetrate in the plate thickness direction,
A method of fixing a steel plate, wherein fillet welding is applied to corners of a peripheral edge portion of an upper end surface of the projecting portion inserted into the through hole and an inner surface of the through hole. The steel plate is located at a distance smaller than the width of the flange of the H steel pile in the opposite direction, and has a pair of parallel side peripheral surfaces arranged along the upper end surface of each of the flanges,
2. The steel plate fixing method according to claim 1, wherein, in each of said side peripheral surfaces, a fillet weld is applied to a corner portion between the upper end surface of said flange and said side peripheral surface. A steel plate fixing structure for fixing a steel plate to form a smooth surface on the upper end of an existing H steel pile,
In the upper end surface of the H steel pile, a protruding portion that protrudes upward from another portion with a protrusion amount smaller than the plate thickness of the steel plate is formed at the upper end of the web of the H steel pile,
A through-hole into which the projecting portion is inserted is formed in the steel plate so as to penetrate in the plate thickness direction,
A steel plate fixing structure in which fillet welding is applied to corners of a peripheral edge portion of an upper end surface of the projecting portion inserted into the through hole and an inner surface of the through hole. The steel plate is located at a distance smaller than the width of the flange of the H steel pile in the opposite direction, and has a pair of parallel side peripheral surfaces arranged along the upper end surface of each of the flanges,
4. The steel plate fixing structure according to claim 3, wherein, in each of said side peripheral surfaces, fillet welding is applied to a corner portion between the upper end surface of said flange and said side peripheral surface.

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