JP2013117136A - Steel material and steel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel material comprising drain means with which a strength approximately equal to an existent steel material can be obtained, without increasing the weight.SOLUTION: A steel material 1 is formed by applying machining to an existent steel material 2 and comprises a pair of strip-shaped flanges 3a and 3b and a strip-shaped web 4 integrally coupling both the flanges 3a and 3b over the full length and, in a boundary 5 between each of the flanges 3a, 3b and the web 4, drain holes penetrating the boundary 5 to an outer surface side of each of the flanges 3a, 3b are provided at a plurality of spots while being spaced in a length direction of each of the flanges 3a, 3b. When a diameter of the drain hole 7 is defined as R and a pitch of the drain holes 7 is defined as H, the diameter and the pitch of the drain holes 7 are set, such that R/H=0.1 is satisfied, thereby adding a drain function to the steel material 1 without reducing a strength of the existent steel material 2.

Description

  The present invention relates to a steel material and a steel structure, and more particularly to a steel material and a steel structure having a water draining function for discharging water such as accumulated rainwater.

  In steel structures such as sluices and bridges, various steel materials (shape steels such as H-shaped steel, I-shaped steel, and grooved steel) are used as main materials. For example, in the case of bridges, the upper structure main girders, vertical girders, horizontal girders and other girders (horizontal materials) and girders that are supported on the upper part of the lower structure abutments and piers are reinforced. As the brace material (diagonal material) to be used, shape steels such as H-shaped steel, I-shaped steel, and groove-shaped steel are used.

  In such a steel structure, water such as rainwater is placed inside the steel material constituting the horizontal material or the diagonal material depending on the position, angle, orientation, relationship with the mating member, etc. of the horizontal material or the diagonal material. A part that tends to accumulate is generated. For this reason, the drain means for discharging the water accumulated from the inside of the steel material is provided to prevent the steel material from being corroded by the accumulated water.

  Examples of steel materials and steel structures provided with this type of means are described in Patent Documents 1 and 2. The steel material described in Patent Document 1 is integrally provided at a predetermined interval in the longitudinal direction of both flange portions between a pair of strip-shaped flange portions provided at predetermined intervals and the inner surfaces of both flange portions. And a web portion made of a plurality of mountain-shaped or arc-shaped web materials, and drains water such as rainwater collected inside the steel material through a slit formed between adjacent web materials. It is comprised so that it may function as a draining means.

  Further, the steel structure described in Patent Document 2 is a soundproof structure disposed between steel girders constituting a steel girder bridge, and is provided with a porous plate and a fiber mat above and below a sound insulation plate made of a metal plate. A sound absorbing layer made of a sound absorbing material, etc., is laminated, and a drainage groove that opens upward from one end to the other end is provided on the sound insulation board, and the drainage groove is received by the upper surface of the soundproof structure, and water such as rainwater is soundproofed. It is configured to function as water draining means for discharging to the outside of the material.

JP 2010-168805 A JP 2010-13902 A

  Incidentally, the steel material described in Patent Document 1 is provided with a plurality of mountain-shaped or arc-shaped web materials between both flange portions in order to obtain the same strength as that of an existing steel material such as H-shaped steel. The weight increases compared with the case of using an existing steel material such as an H-shaped steel. Moreover, since it is necessary to join each web material integrally by welding etc. between both flange parts, the operation | work takes very much work. Furthermore, the steel structure described in Patent Document 2 takes a lot of time to manufacture because the structure of the drainage groove is complicated.

  The present invention has been made in view of the above-described conventional problems, and can obtain the same strength as an existing shape steel without increasing the weight, and has a simple structure and easy manufacture. An object of the present invention is to provide a steel material and a steel structure provided with a draining means for discharging water such as water.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention is a steel material formed by processing an existing steel material, and includes a pair of strip-shaped flange portions and a strip-shaped web portion that integrally connects the two flange portions. A plurality of drain holes that penetrate the boundary portion to the outer surface side of each flange portion at intervals in the length direction of each flange portion. It is characterized by being provided in.

  According to the steel material of the present invention, when water such as rainwater flows into the inner portion surrounded by both the flange portion and the web portion, the water is discharged to the outer surface side of each flange portion through each drain hole. Will be. Therefore, since water such as rain water does not collect in the inner portion surrounded by both flange portions and the web portion, the steel material does not corrode due to the accumulated water.

  Moreover, in this invention, the said drain hole is from the 1st through-hole which penetrates each said flange part, and the 2nd through-hole which continues through the said 1st through-hole while penetrating the said web part. Thus, the first through hole and the second through hole may be provided across the flange portion and the web portion.

  According to the steel material of the present invention, when water such as rainwater flows into a portion surrounded by both the flange portion and the web portion, the water passes through the first through hole and the second through hole of each drain hole. It will be discharged to the outer surface side of each flange part.

  Furthermore, in this invention, the said drain hole is good also as being comprised from the through-hole which penetrates each said flange part.

  According to the steel material of the present invention, when water such as rainwater flows into a portion surrounded by both the flange portions and the web portion, the water flows through each drain hole provided in each flange portion. It will be discharged to the outer surface side.

  Further, in the present invention, when the diameter of the drain hole is R and the pitch of the drain hole is H, the diameter and pitch of the drain hole are set so that R / H = 0.1 or less. It may be set.

  According to the steel material of the present invention, an existing steel material is provided by providing a plurality of water drain holes in an existing steel material so that the relationship between the diameter and pitch of the water drain holes is R / H = 0.1 or less. The same level of strength can be obtained. Accordingly, it is possible to impart a water draining function for discharging water such as rainwater to an existing steel material without reducing the strength.

  Furthermore, this invention was constructed using the steel material according to any one of claims 1 to 4 as a main material.

  According to the steel structure of the present invention, water such as rain water does not accumulate in the steel material as the main material of the steel structure, so that the steel material as the main material does not corrode with the accumulated water, The performance as a main material can be maintained for a long time.

  As described above, according to the steel material and the steel structure of the present invention, it is possible to provide a water draining function for discharging water such as rainwater to the existing steel material without reducing the strength of the existing steel material. .

It is the schematic which showed the whole one embodiment of the steel materials of this invention. It is sectional drawing seen along the AA line of FIG. It is the elements on larger scale of FIG. It is A arrow directional view of FIG. FIG. 4 is a view taken in the direction of arrow B in FIG. 3. It is the schematic which showed the conventional steel materials (sample 1) used for an intensity | strength analysis. It is the schematic which showed the steel material (sample 2) of this invention used for an intensity | strength analysis. It is explanatory drawing which showed the result of the strength analysis.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of a steel material and a steel structure according to the present invention. The steel materials and steel structures of the present embodiment are effective for steel structures such as sluices and bridges in which various steel materials (shape steels such as H-shaped steel, I-shaped steel, and grooved steel) are used as main materials. It is.

  That is, the steel material 1 of the present embodiment uses a shape steel such as an H-shaped steel, an I-shaped steel, and a grooved steel as a material, and by providing the water draining means 6 to these shaped steels, A water draining function for discharging water such as rainwater accumulated in the steel structure 12 as a main material is provided.

  In the present embodiment, as shown in FIG. 1, the existing H-section steel 2 is used as the material of the steel material 1. As H-section steel 2, rolled steel for building structure (JIS G 3136), rolled steel for general structure (JIS G 3101), rolled steel for welded structure (JIS G 3106), weather resistant hot rolled steel for welded structure ( In addition to JIS G 3114), various H-section steels can be used.

  As shown in FIG. 1, the H-section steel 2 is formed between a pair of strip-shaped flange portions 3a and 3b provided in parallel at a predetermined interval, and a central portion on the inner surface side of both flange portions 3a and 3b. It has a strip-shaped web portion 4 that is integrally connected over the entire length of both flange portions 3a, 3b.

  As shown in FIGS. 1 to 5, the steel material 1 of the present embodiment has a boundary portion 5 between the flange portions 3 a and 3 b and the web portion 4 of the H-section steel 2, and the boundary portion 5 from the inner surface side to the outer surface side. A plurality of drain holes 7 penetrating through the flange portions 3a and 3b are provided at predetermined intervals in the length direction of the flange portions 3a and 3b. 1 is configured to drain water, such as rainwater, accumulated inside 1 (the portion surrounded by the inner surfaces of both flange portions 3a and 3b and the upper surface of the web portion 4) to the outside of the steel material 1.

  As shown in FIGS. 3 to 5, for example, each drain hole 7 is formed between a circular first through hole 8a penetrating between the inner and outer surfaces of each flange portion 3a, 3b and the upper and lower surfaces of the web portion 4. It is configured by continuously providing a semicircular second through hole 8b communicating with the first through hole 8a penetrating therethrough. That is, each drain hole 7 is provided so as to straddle the flange portions 3 a and 3 b and the web portion 4. The inner surface side and the outer surface side of the steel material 1 are communicated with each other through the first through hole 8a and the second through hole 8b of the drain hole 7.

  As shown in FIGS. 3 to 5, the center of the first through hole 8 a of each drain hole 7 is located at the center in the width direction of each flange portion 3 a, 3 b (the center in the thickness direction of the web portion 4). Thus, the second through holes 8b are provided in the flange portions 3a and 3b. The second through holes 8b communicating with the first through holes 8a are provided in the portions of the web portions 4 on the extensions of the first through holes 8a.

  The diameter of the drain holes 7 and the pitch of the drain holes 7 are set to R / H = 0.1 or less when the diameter of the drain holes 7 is R and the pitch of the drain holes 7 is H. . By providing the drain holes 7 at a plurality of locations on the steel material 1 so as to satisfy this conditional expression, the strength of the steel material 1 is not reduced, and the same as the existing H-section steel 2 before the drain holes 7 are provided. A degree of strength is obtained. Here, the diameter of the drain hole 7 and the pitch of the drain hole 7 mean the diameter of the first through hole 8 a of the drain hole 7 and the pitch of the first through hole 8 a of the drain hole 7. .

  The drain hole 7 may be configured by providing a circular through hole only at the center of each flange portion 3a, 3b, or only at a portion above the web portion 4 of each flange portion 3a, 3b. A shape or a semicircular through hole may be provided.

  The drain hole 7 is not limited to the above-mentioned circular shape and semicircular shape, and may have various shapes such as an elliptical shape, an oval shape, a triangular shape, and a quadrangular shape.

  When the steel material 1 having the above-described configuration is used as a girder material (horizontal material) or brace material (diagonal material) as a main material of a steel structure such as a sluice or a bridge, the position, angle, Depending on the orientation or the like, a location where water such as rainwater is likely to accumulate is generated on the inner surface side of the steel material 1 (the portion surrounded by the inner surfaces of both flange portions 3a and 3b and the upper surface of the web portion 4).

  However, in the present embodiment, the drainage that allows the inner surface side and the outer surface side of the steel material 1 to communicate with each other at the boundary portion 5 between the flange portions 3a, 3b and the web portion 4 on the inner surface side of the steel material 1. Since the holes 7 are provided at a plurality of positions in the length direction of the steel material 1 at predetermined intervals, and the water draining means 6 is constituted by the plurality of water drain holes 7, water such as rainwater can be supplied to the steel material 1. Even if it flows inward, the water is discharged to the outside of the steel material 1 through each drain hole 7.

  Therefore, since water such as rainwater does not accumulate inside the steel material 1, the steel material 1 is not corroded by the accumulated water such as rainwater, and the performance as the main material of the steel structure is long-term. Can be maintained.

  Moreover, if the steel material 1 of this Embodiment uses the existing H-section steel 2 as a material and provides the several drain hole 7 in the existing H-section steel 2 by machining etc., it will describe in patent document 1 As described above, a complicated operation of joining a plurality of web materials by welding between the flange portions is not necessary, and can be easily manufactured.

  Furthermore, even if a plurality of drain holes 7 are machined in the existing H-section steel 2, the strength comparable to that of the existing H-section steel 2 can be obtained. In order to ensure the same strength as the shape steel, the weight does not increase, and the steel structure can be reduced in weight.

  In FIGS. 6-8, the result of the strength analysis of the existing H-section steel 2 and the steel material 1 of this Embodiment is shown. In this analysis, the existing H-section steel 2 having A (height) × B (width) = 300 (mm) × 300 (mm) was used (comparative example). Moreover, as the steel material 1 which is an Example of this invention, the same H-section steel 2 as said H-section steel 2 is used, and R (diameter) = 30 (in each flange part 3a, 3b of this H-section steel 2) mm) water drain hole 7 (first through hole 8a) was provided with H (pitch) = 300 (mm) (Example).

  In this analysis, as shown in FIGS. 6 and 7, the A− of the flange portions 3 a and 3 b when a load of 100 kN is applied to the longitudinal center point of the flange portions 3 a and 3 b of the comparative example and the embodiment. The displacement amount and the stress value at point B on the A line (the center point in the length direction of the flange portions 3a and 3b) were calculated using an existing analysis program (such as an FEM analysis program) for the displacement amount and the stress value.

  The result of this analysis is shown in FIG. From the analysis result of FIG. 8, it can be seen that in the example, the maximum displacement (mm) is 1.01 times and the stress value at the point B is 1.01 times as compared with the comparative example. As described above, in the example, the same strength as that of the comparative example was obtained, and in the example, although the plurality of drain holes 7 were processed, no strength reduction was observed.

  Therefore, when a steel structure such as a sluice or a bridge is constructed using the steel material 1 of this embodiment (the H-shaped steel 2 provided with the drain hole 7) as a main material, the conventional steel material (H-shaped steel) ) As the main material, and the same strength as steel structures such as sluices and bridges can be obtained, and lighter than conventional steel structures.

  In the above description, the H-shaped steel 2 is used for the steel material 1 according to the present invention. However, the present invention may be applied to an I-shaped steel and a grooved steel. By providing a water drain hole between the web portion and the web portion, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Steel material 2 H-section steel 3a, 3b Flange part 4 Web part 5 Boundary part 6 Water draining means 7 Water drain hole 8a 1st through-hole 8b 2nd through-hole

Claims (5)

A steel material formed by processing existing steel material,
A pair of strip-shaped flange portions, and a strip-shaped web portion that integrally connects the two flange portions;
Water drainage holes that penetrate the boundary portion to the outer surface side of each flange portion are provided at a plurality of locations at intervals in the length direction of each flange portion at the boundary portion between each flange portion and the web portion. Steel material characterized by that.   The drain hole comprises a first through hole penetrating each flange portion, and a second through hole penetrating the web portion and provided continuously to the first through hole. The steel material according to claim 1, wherein the hole and the second through hole are provided across the flange portion and the web portion.   The steel material according to claim 1, wherein the drainage hole is configured by a through-hole penetrating each flange portion.   The diameter and pitch of the drain holes are set so that R / H = 0.1 or less, where R is the diameter of the drain holes and H is the pitch of the drain holes. The steel material according to any one of claims 1 to 3.   A steel structure constructed using the steel material according to any one of claims 1 to 4 as a main material.