JP2012127100A - Deck plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deck plate which improves flexural rigidity in a plate width direction and increases flexural deformation strength.SOLUTION: A deck plate comprises a web part that is curved using a thin steel plate of a plate thickness of 0.6 mm or less and has a substantially triangular cross section and a flange part horizontally projecting from the apex of the web part, and in the flange part, a plurality of stripe-like embossments are arranged that extend in a width direction and a lengthwise direction and of which maximum peak height is 1.5-2.5 mm.

Description

  The present invention relates to a deck plate used mainly as a flooring material for reinforced concrete in buildings and structures.

  As shown in FIG. 1, a deck plate used as a reinforced concrete flooring for a building or a structure is conventionally made of a steel plate having a thickness of about 0.8 to 3 mm, using a roll forming machine, and a plurality of sections having a substantially triangular cross section. The web portion 1 and the flange portion 2 connecting the web portions 1 are continuously cold-formed.

  Such a deck plate is generally used so as to be bridged between beam members installed at a predetermined interval, and concrete is placed thereon, so that the flange portion 2 is particularly bent. A material having high rigidity and high strength against bending deformation is required. In this sense, the conventional deck plate is basically suitable for a thick plate, but on the other hand, there is also a demand for weight reduction, and as described above, a steel plate of about 0.8 to 3 mm is used. is there.

  For example, in Patent Document 1, a steel plate having a narrow flange (upper flange) structure and having a thick plate thickness (1.6 mm) is used to further withstand the load of reinforced concrete to be placed, and the web portion 2 proposes a deck plate in which a reinforcing steel material having a thickness of 3.2 mm is welded to 2.

  In Patent Document 2 and Patent Document 3, a plurality of embosses 3 extending in the plate width direction are arranged in order to increase the bending rigidity in the width direction of the deck plate. A deck plate is disclosed in which a groove for receiving the joining end portion of the flange portion 2 is provided on the upper portion of the web portion 1 together with the concave and convex grooves showing the function. In addition, these emboss 3 plays the role which improves the bending rigidity and bending deformation strength of the flange part 2, and is 0.3-1 in the height of a mountain for the purpose of prevention of the slip of the worker at a construction site. It is generally formed into a small size of about 2 mm.

JP-A-6-229047 Japanese Patent Application Laid-Open No. 61-108551 Japanese Patent Laid-Open No. 4-237749 Japanese Utility Model Publication No. 64-14815

  Most of the deck plates disclosed in Patent Documents 1 to 4 use steel plates having a thickness of about 0.8 mm to 1.6 mm. On the other hand, for the purpose of cost reduction and weight reduction, a relatively thin steel plate deck plate having a thickness of about 0.8 mm may be used. However, in this case, since the yield strength against bending rigidity and bending deformation strength in the longitudinal direction is reduced, measures such as reducing the applicable beam span and installing reinforcing materials from the bottom are taken to ensure safety and an appropriate length. It was indispensable to secure the amount of deflection in the right direction. For this reason, there has been a problem that costs are increased due to a change in the construction of the building / structure.

  Moreover, if a thin steel plate deck plate with a thickness of 0.8 mm or less is used, the amount of deflection in the width direction of the flange portion increases due to the upper reinforced concrete load, which is undesirable in appearance and increases the amount of reinforced concrete. The accompanying high cost problem also arises. In particular, the deflection in the width direction of the flange portion is substantially difficult to adjust by, for example, the beam span interval. Depending on the load of the reinforced concrete slab, local deflection of the flange portion may be caused. It was. For this reason, it is practically difficult to use a thin steel plate with a thickness less than 0.8 mm, which is advantageous in terms of cost, in a short-span deck plate with low required bending rigidity and bending deformation strength in the longitudinal direction. The actual situation is that a steel plate having a thickness of 0.8 mm or more must be used. In fact, this was also a factor in increasing costs.

  Moreover, the embossment constructed on the surface of the flange portion as disclosed in Patent Documents 2 to 4 is generally formed for the purpose of improving the rigidity of the flange portion together with the anti-slip of the operator. In particular, it is known that the depth of processing has a great influence on the bending rigidity and the like, and that the larger this is, the higher the rigidity is.

  However, when the embossing depth (peak height) of a steel plate having a thickness of about 0.3 mm to 1.2 mm is excessively increased during cold forming of the deck plate, it is distributed in the flange width direction of the deck plate. As a result, the difference in processing strain in the longitudinal direction increases, and a three-dimensional twist occurs in the entire deck plate. This phenomenon often causes a big problem in the strength, rigidity or workability of the flange surface when the plate thickness is thinner, that is, when a deck plate having a thickness of 0.6 mm or less is to be used. .

  The present invention was developed to solve the above-mentioned problems of conventional deck plates, and mainly aims to improve the bending rigidity in the flange width direction and propose a deck plate having a high bending deformation strength. And

  Another object of the present invention is to propose a deck plate that can contribute to cost reduction through weight reduction obtained by making it thin, and can save the amount of concrete to be placed through prevention of bending. It is in.

As a result of intensive studies for realizing the above object, the inventors of the present invention have developed a web portion having a substantially triangular cross-sectional shape formed by using a thin steel plate having a thickness of 0.6 mm or less, and the web portion. It consists of a flange part that protrudes horizontally from the top of the part,
Ascertaining the effectiveness of the deck plate characterized in that a plurality of streak-like embosses extending in the width direction and having a mountain height of 1.5 to 2.5 mm are arranged in the flange portion, The present invention has been conceived.

In the present invention,
(1) The flange portion has a reinforcing vertical rib in the longitudinal direction along the vicinity of the web portion;
(2) The emboss is a middle or high shape having a triangular shape or a substantially trapezoidal or a substantially arc shape in which the height in the width direction is high in the central portion and the both ends are low,
(3) The embossing has a cross-section with a mountain-wave shape or a rib-like streaky convex shape,
(4) The embossments are arranged in a row with a mountain interval of 15 to 20 mm,
(5) The reinforcing vertical rib is provided at a joining end portion of the flange portion,
However, it has also been found to be a more preferable solution.

According to the present invention having the configuration as described above, the following effects can be obtained.
a. Even if a thin steel sheet with a thickness of 0.6 mm or less is used, the bending rigidity and bending in the flange width direction can be increased by forming appropriate various embosses and by making the cross-sectional shape in the flange width direction medium to high distribution. A deck plate having excellent deformation strength and excellent moldability can be obtained.
b. By using a thin steel sheet with a thickness of 0.6 mm or less, it is possible to reduce the weight because it can reduce the weight, and it is possible to prevent deflection through improvement of bending rigidity and bending deformation strength in the flange width direction. In this respect, it also contributes to cost reduction.

The front view of a general deck plate is shown. It is a figure which shows an example of the deck plate which concerns on this invention. It is a figure which shows the other example of the deck plate which concerns on this invention. It is a figure which shows the further another example of the deck plate which concerns on this invention. It is explanatory drawing which shows the way of joining of the deck plate which concerns on this invention. It is a figure which shows the further another example of the deck plate which concerns on this invention.

  2 (a) to 2 (c) show an embodiment of a deck plate according to the present invention, and the basic configuration is a web portion having a substantially triangular cross-sectional shape as in the conventional example described above. 1 and a flange portion 2 continuously provided so as to project on both sides in the horizontal direction across the web portion 1.

  In view of this, the inventors first assumed that the deck plate is formed using a thin steel plate having a thickness of 0.6 mm or less, and in this case, in the conditions that require a solution, particularly in the width direction of the flange portion 2. Various investigations were made on the structure of the embossing provided along the surface. That is, with respect to such a thin deck plate, first, a reliability test regarding bending deformation strength, bending rigidity, and processing distortion of the flange portion 2 was performed, and a desirable embossed shape was investigated.

  As a result, in the deck plate made of a thin steel plate with a thickness of 0.6 mm or less, the embossing 3a, 3b formed on the flange portion 2 has an important processing depth, i.e., the peak height h. It has been found that it is effective to set this value h within the range of 1.5 to 2.5 mm.

  That is, if the peak height (working depth) h of the emboss 3a roll-formed on the flange portion 2 is less than 1.5 mm, the bending rigidity and bending deformation strength of the flange surface are insufficient, while the peak height exceeding 2.5 mm. This is because an excessive machining distortion occurs in the case of h. Therefore, in the deck plate of the present invention, the peak height of the emboss 3a formed on the flange portion 2 needs to be in the range of 1.5 to 2.5 mm.

  And in the deck plate which concerns on this invention, as a cross-sectional shape of the said embossing provided in the said flange part 2, as shown in FIG.2 (c), the mountain wave shape 3a which continues in a sawtooth shape, or FIG.3 (c) ) As shown in FIG. 5A, and may be any of the streak-like protrusions (ridges) formed by raising the oval rib shape 3b at equal intervals. Limited. In particular, in the case of the former embossing (mountain wave shape) 3a, the machining shape is continuously bent in the length direction of the deck plate as compared with that of the rib shape 3b. This is a preferred shape because it has a feature that residual stress during emboss molding is more dispersed and processing distortion is less likely to occur.

  Moreover, it is preferable that the distance D between adjacent ridges of the embosses 3a and 3b is formed with a distance of 15 to 20 mm. On the other hand, when the crest distance is less than 15 mm, the processing strain increases. On the other hand, when it exceeds 20 mm, it is difficult to obtain the required bending strength and bending deformation strength, and the meaning of providing embossing is reduced.

  Thus, it is preferable to devise these shapes and dimensions for the embosses 3a and 3b formed on the flange portion 2 so as to prevent the occurrence of processing distortion. This is because it is expected that the dimensional error and the like will be insufficiently managed when the deck plate is loom-formed, and the above-mentioned actions and effects will not necessarily be obtained.

  Therefore, in the present invention, as shown in FIGS. 4 (a) and 4 (b), the oblong reinforcing vertical rib 4 extending in the longitudinal direction along the vicinity of the web portion 1 of the flange portion 2 is formed to be raised. Decided to do. The presence of the reinforcing vertical rib 4 formed in the vertical direction perpendicular to the embosses 3a and 3b prevents shape defects (inferior flatness) such as torsion and distortion of the deck plate after molding. Above, it is very effective.

  The reinforcing vertical rib 4 preferably has a peak height (h) of 1.5 to 2.5 mm in the same manner as the above-described embosses 3a and 3b. It is preferable to form. As shown in FIG. 5, when this reinforcing vertical rib 4 is formed, the deflection and rigidity deterioration of the flange portion 2 are alleviated by superimposing (supporting) the flange end 2b protruding from the web portion 1. It is.

  Next, as another embodiment of the present invention, a structure of the flange portion 2 as shown in FIGS. 6A and 6B is proposed. Thus, in the present invention, the embosses 3a and 3b are formed in order to ensure the rigidity of the flange portion 2, but the bending moment due to the load of the concrete slab is the same in the embosses 3a and 3b as well as the flange portion 2. Take it. The distribution of the bending moment also applied to the emboss is considered to be small at both ends in the width direction and large at the center in terms of a single emboss. That is, in the case of a flange portion supported between two web portions (fulcrum points), the maximum deflection generation point (maximum bending stress generation point) is located at the center of the flange portion 2.

  Therefore, in the present invention, the height distribution in the flange width direction of the embosses 3a and 3b, that is, the peak height h is within a range of 1.5 to 2.5 mm, and is high at the center and preferably low at both ends. Is formed into a triangular shape 3c or a substantially trapezoidal shape or a substantially arcuate shape 3d that gradually decreases from the central portion to both end portions to correspond to the distribution of the bending moment.

  By adopting such a configuration, the deck plate belonging to this embodiment of the present invention secures high bending rigidity and bending deformation strength of the flange portion 2, and further prevents processing distortion generated at both ends in the width direction of the emboss. Can be effectively blocked and reduced.

  The structure of the above-described deck plate according to the present invention can be applied not only as a reinforced concrete floor structure material of the illustrated building / structure, but also as a material in the field of scaffolding plates, partition walls, roofing materials, and the like.

DESCRIPTION OF SYMBOLS 1 Web part 2 Flange part 3a, 3b, 3c, 3d Embossing 4 Vertical rib for reinforcement

Claims (6)

It is formed by using a thin steel plate having a thickness of 0.6 mm or less, a web portion having a substantially triangular cross-sectional shape, and a flange portion projecting horizontally from the top of the web portion,
A deck plate characterized in that a plurality of streak-like embossments extending in the width direction and having a peak height of 1.5 to 2.5 mm are arranged on the flange portion.   The deck plate according to claim 1, wherein the flange portion has reinforcing ribs in a longitudinal direction along the vicinity of the web portion.   3. The deck plate according to claim 1, wherein the emboss has a triangle shape or a substantially trapezoidal or substantially arcuate shape having a height in the width direction at a central portion and low at both ends.   The deck plate according to any one of claims 1 to 3, wherein the emboss has a mountain-like shape or a rib-like streak-like cross section.   The deck plate according to any one of claims 1 to 4, wherein the embosses are arranged in a row with a mountain interval of 15 to 20 mm.   The deck plate according to claim 2, wherein the reinforcing vertical rib is provided at a joint end portion of the flange portion.

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