Technical Field

[I] The present invention relates to construction and, more particularly, to a structure of reinforcing an H beam.

Background Art [2] As shown in FIG. 1, an H beam 10 includes two flanges 11 and a web 12. Due to a large resistance (bending strength) to a bending moment in a specific direction, the H beam has been widely used as a constructional element. [3] Particularly, the H beam 10 is widely used as an element for a soldier pile method in an earth retaining work during a ground work. As shown in FIG. 2, the H beams 10 are posted on the ground at a predetermined interval, and braced walls 20 are inserted between the H beams 10. [4] A bending strength of the H beam is proportional to a second moment of area and a modulus of section in a cross section thereof. [5] In a conventional H beam, in order to enlarge the H beam while maintaining the cross-sectional shape, a thickness and width of the cross section of the H beam need to be increased. However, cost is also increased. [6] Therefore, in order to minimize an increase in cost and obtain a high strength, there is a need to construct an efficient cross-sectional shape of the H beam.

Disclosure of Invention

Technical Problem [7] The present invention is to provide a reinforced H beam having a cross-sectional structure capable of minimizing an increase in cost and obtaining a high bending strength.

Technical Solution [8] According to an aspect of the present invention, there is provided a reinforced H beam comprising a reinforcing portion 100 which is formed to protrude from an outer surface of a flange 11, wherein a degree of protrusion of the reinforcing portion 100 is the largest at the central portion thereof, and wherein the degree of protrusion is gradually lowered from the central portion toward the end sides. [9] In the above aspect, the reinforcing portion 100 may have an outwardly-convex curved shape. [10] In addition, the reinforcing portion 100 is formed by attaching the reinforcing member 110 to the flange 11.

[I I] In addition, the reinforcing member 110 may be attached by welding. [12] In addition, the reinforcing member 110 may comprise: a convex portion 111; and attaching portions which are formed to extend from two sides of the convex portion

111. [13] In addition, the reinforced H beam may further comprise an engagement member 114 which penetrates an engagement hole 13 formed at a deep portion of the flange 11 and an engagement hole 113 formed at a deep portion of the assembling portion 12 of the reinforcing member. [14] In addition, a hollow portion 120 may be formed between the reinforcing portion 100 and the flange 11. [15] In addition, a flat wale assembling portion 130 may be formed at the central portion of the reinforcing portion 100 so as to be assembled with a wale. [16] According to another aspect of the present invention, there is provided an earth retaining method using the reinforced H beam according to the above aspect as a soldier pile. [17] In the above aspect, the reinforcing portion 100 may be partially formed in a portion of the reinforced H beam, where a large bending moment is generated.

Advantageous Effects

[18] Accordingly, it is possible is to provide a reinforced H beam having a cross-sectional structure capable of minimizing an increase in cost and obtaining a high bending strength. Brief Description of Drawings

[19] FIG. 1 is a cross-sectional view showing a conventional H beam.

[20] FIG. 2 is a plan view showing a conventional earth retaining structure.

[21] FIGs. 3 to 12 show reinforced H beams according to embodiments of the present invention.

[22] FIG. 3 is a cross-sectional view of a first embodiment.

[23] FIG. 4 is a cross-sectional view of a second embodiment.

[24] FIG. 5 is a perspective view of a third embodiment.

[25] FIG. 6 is a cross-sectional view of a third embodiment.

[26] FIG. 7 is an exploded perspective view of a fourth embodiment.

[27] FIG. 8 is an exploded perspective view of a fifth embodiment.

[28] FIG. 9 is a cross-sectional view of a fifth embodiment.

[29] FIG. 10 is a cross-sectional view of a sixth embodiment.

[30] FIG. 11 is a plan view showing a earth retaining structure employing a reinforced H beam.

[31] FIG. 12 is a cross-sectional view showing a earth retaining structure employing a reinforced H beam. Best Mode for Carrying out the Invention

[32] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[33] As shown in FIG. 3, a reinforce H beam according to the present invention basically includes reinforcing portions 100, each of which is formed to protrude from an outer surface of each flange 11 in order to increase a modulus of section. A degree of protrusion of the reinforcing portion 100 is the largest at the central portion thereof.

[34] The degree of protrusion is gradually lowered from the central portion toward the end sides of the reinforcing portion 100.

[35] The bending strength of the cross section is increased in proportion to a second moment of area and the modulus of section. The second moment of area and the modulus of section are increased as most mass of the cross section is distributed so as to be apart from the center of weight of the cross section in the outward direction.

[36] Therefore, if the cross-sectional area is the same, the second moment of area of the

H-shaped (I-shaped) cross section is much larger than that of a rectangular cross section. Accordingly, the H-shaped cross section has a higher bending strength.

[37] The present invention is implemented based on a theory of structural mechanics. By increasing a mass of the flange portion in the cross section of the H beam, a large second moment of area and a high modulus of section can be obtained while the increase in the cross-sectional area is minimized.

[38] More specifically, the reinforcing portion 100 is formed to protrude from the outer surface of the flange 11, so that the effect of weight increase occurs at the farthest position from the center of weight of the cross section. In addition, the degree of protrusion of the reinforcing portion is designed to be the largest at the central portion thereof, so that the largest effect of the increase in the second moment of area occurs at the central portion of the reinforcing portion 100. In addition, since the effect of increase in the second moment of area in the other portions is relatively small in comparison to the increase in the cross-sectional area, the degree of protrusion of the other portions is designed to be gradually lowered.

[39] Therefore, it is possible to implement an efficient cross-sectional structure, where an increase in cost can be minimized due to a small increase in the cross-sectional area, and a high bending strength can be obtained due to the increase in the second moment of area and the modulus of section.

[40] In order to check these effects, the second moments of area and the moduli of section of a conventional H beam (FIG. 1) and the reinforced H beams (the embodiments of FIGS. 4, 6, and 9) according to the present invention are calculated. The result of calculation is listed in the following Table 1. [41] Table 1 [Table 1] [Table ]

[42] The dimension of the H beam is 300x300x10x15. Thickness of the reinforcing members 100 according to the embodiments of FIGs. 6 and 9 is set to the same as the thickness of the flange 11.

[43] According to the result of calculation, it can be understood that, in comparison to the conventional H beam, the reinforced H beam has the high second moment of area I and the high modulus of section Z while the increase in the cross-sectional area A is not enlarged.

[44] As shown in FIG. 2, in an earth retaining work using the conventional H beams, the interval between the H beams needs to be less than a predetermined distance. However, according to the present invention, since the reinforced H beam has a high bending strength, the interval between the reinforced H beams can be enlarged as shown in FIG. 11.

[45] Hereinafter, the embodiments according to the aforementioned basic concept are described in detail. [46] The object of the present invention can be implemented by using any structure of the reinforcing portion 100, of which degree of protrusion is the largest at the central portion thereof and gradually lowered from the central portion toward the end sides. Therefore, as shown in FIG. 3, the reinforcing portion 100 has an outwardly-convex curved shape.

[47] Alternatively, as shown in FIG. 4, the reinforcing portion 100 has a shape where the central portion is provided with a flat portion and the side portions are gradually declined.

[48] In addition, as shown in FIGs. 3 and 4, the reinforcing portion 100 and the flange 11 are constructed in an integrated structure. Alternatively, as shown in FIGs. 5 to 9, a separate reinforcing member 110 may be attached to the flange 11.

[49] Practically, the H beams with specific standards are commercially in mass production. The mass-produced H beams can be used at low cost. Therefore, by manufacturing the separate reinforcing members 110 and assembling the the separate reinforcing members 110 to the mass-produced H beams, the cost can be efficiently reduced.

[50] As shown in FIGs. 5 to 7, the reinforcing member 110 can be attached to the flange

11 by welding. Alternatively, as shown in FIGs. 8 and 9, the reinforcing member can be attached to the flange 11 by using engagement members 114 such as bolts, nets, and rivets.

[51] FIGs. 8 and 9 show embodiments where the reinforcing member 110 includes a convex curved portion 111 and attaching portions which are formed to extend from two sides of the convex curved portion 111.

[52] Since the contact area between inner surfaces of the attaching portions 112 and outer surfaces of the flanges 11 is increased, more stabilized attaching can be secured.

[53] In the case where the reinforcing member 110 has the aforementioned structure, as shown in FIG. 7, the inner surfaces of the attaching portions 112 and the outer surfaces of the flanges 11 can be attached by welding. Alternatively, as shown in FIG. 8, the inner surfaces of the attaching portions 112 and the outer surfaces of the flanges 11 can be attached by using engagement members 114 which penetrate engagement holes 13 formed in deep portions of the flanges 11 and engagement holes 113 formed in deep portions of the attaching portions 112 of the reinforcing member 110.

[54] As shown in FIGs. 3 and 5, hollow portions 120 may be formed between the reinforcing portion 100 and the flanges 11. In addition, as shown in FIG. 4, the hollow portion 120 may not be formed.

[55] Referring to Table 1, in the case where the hollow portion 120 is not formed as shown in FIG. 4, the second moment of area I and the modulus of section Z are advantageously high, but there is a disadvantage in that the increase in the cross-sectional area A is also large. On the other hand, in the case where the hollow portion 120 is formed as shown in FIGs. 6 and 9, the advantages and disadvantages are reversed.

[56] Therefore, the most suitable method can be selected by taking into consideration the structural stability, the economical efficiency, and the like of the structure to which the reinforced H beams according the present invention are provided.

[57] In the case where the reinforced H beams according to the present invention are used as soldier piles of an earth retaining structure as shown in FIG. 11, a flat wale assembling portion 130 may be formed at the central portion of each reinforcing portion 100 as shown in FIGs. 4 and 10, so that the reinforcing portions 100 can be easily assembled with a wale that is installed in front of the solider piles.

[58] In this manner, in the case where the reinforced H beams used as the solider piles of the earth retaining structure, although the reinforcing portions 100 may be formed over the entire portions of the H beams 10, as shown in FIG. 12, the reinforcing portions 100 may be partially formed to some portions of the H beams 10 where the high bending moment occurs. [59] In addition to the solider pile, the reinforced H beam according to the present invention can be used as various structural members such as a strut.

[60] While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.