JP5773505B2 - Steel flooring - Google Patents
Steel flooring Download PDFInfo
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- JP5773505B2 JP5773505B2 JP2013150307A JP2013150307A JP5773505B2 JP 5773505 B2 JP5773505 B2 JP 5773505B2 JP 2013150307 A JP2013150307 A JP 2013150307A JP 2013150307 A JP2013150307 A JP 2013150307A JP 5773505 B2 JP5773505 B2 JP 5773505B2
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Description
本発明は、コンテナ運搬船のデッキやＲＯ−ＲＯ船の車両甲板や、コンテナ運搬船のハッチカバー（１００乃至２００ｍ２）のような大型の鋼床板に関するものである。 The present invention relates to a large steel floor board such as a deck of a container carrier ship, a vehicle deck of a RO-RO ship, and a hatch cover (100 to 200 m 2 ) of a container carrier ship.
従来、鋼床板の構造としては、デッキプレートの下面に起立したウェブが所定間隔で並設され、その間にウェブより背の低い多数のリブが配設される。そして、ウェブの下側には隣り合うウェブを横方向に連結する下床が設けられる。 Conventionally, as a structure of a steel floor plate, webs erected on the lower surface of the deck plate are juxtaposed at a predetermined interval, and a plurality of ribs lower than the web are disposed therebetween. And the lower floor which connects an adjacent web to a horizontal direction is provided under the web.
例えば、特許文献１は、上フランジ鋼床板と下フランジ鋼床板との間に間隔を開けて起立した２枚のウェブ鋼板で結合して箱断面の桁を形成している。また、一部の箇所であるが、下フランジ鋼板を横方向に連続させている。特許文献１には上フランジ鋼床板とウェブ鋼板との接続の手段は明らかでない。 For example, in Patent Document 1, a girder of a box cross-section is formed by joining two web steel plates standing up with a gap between an upper flange steel floor plate and a lower flange steel floor plate. Moreover, although it is a one part location, the lower flange steel plate is continued in the horizontal direction. Patent Document 1 does not disclose the means for connecting the upper flange steel floor plate and the web steel plate.
特許文献２には、デッキプレートの下面に複数条のＵリブが溶接され、ＵリブとＵリブの間に補強リブが溶接され、さらに２つのＵリブの下面に固定板を渡して溶接若しくはボルトで固定し、補強リブに接合した鋼床板が開示されている。この文献の鋼床板によれば、ＵリブとＵリブとの間に掛かる車両重量を補強リブにより支えることにより、デッキプレートとＵリブの溶接部との疲労亀裂を押さえることができる。また、特許文献３には、間隔をおいて角形鋼管を配置し主桁とし、その上に鋼床板を高力ボルトで接合し、隣り合う角形鋼管の間に多数の縦リブを配置した構造が開示されている。 In Patent Document 2, a plurality of U-ribs are welded to the lower surface of the deck plate, a reinforcing rib is welded between the U-ribs and the U-ribs, and a fixing plate is passed to the lower surfaces of the two U-ribs to weld or bolt The steel floor board fixed by this and joined to the reinforcement rib is disclosed. According to the steel floor plate of this document, fatigue cracks between the welded portion of the deck plate and the U rib can be suppressed by supporting the vehicle weight applied between the U rib and the U rib by the reinforcing rib. Further, Patent Document 3 has a structure in which square steel pipes are arranged at intervals to form main girders, a steel floor plate is joined with high strength bolts thereon, and a number of vertical ribs are arranged between adjacent square steel pipes. It is disclosed.
特許文献１の鋼床板の構造によればデッキプレートの下側でウェブ鋼板同士が連結されており、また、特許文献２の鋼床板の構造によればＵリブの下面が連結されているため、これらリブとデッキプレートの接続箇所の疲労亀裂の問題を抑制することができる。しかしながら、デッキプレートの下面に縦リブを溶接する構造では、溶接する際に発生する熱によりリブが歪む。リブの断面二次モーメントの大きさは、リブの厚さよりも高さが支配的であり、強度を保ちかつリブの重量を減らすにはリブを薄くして高さを高くするのが望ましいが、リブの厚さを薄くすると熱に対する歪の影響が顕著となる。従って、リブは熱による歪を受けないように厚くせざるを得ず、自重が増加する。 According to the structure of the steel floor plate of Patent Document 1, the web steel plates are connected to each other under the deck plate, and according to the structure of the steel floor plate of Patent Document 2, the lower surface of the U rib is connected, The problem of fatigue cracks at the connection between the rib and the deck plate can be suppressed. However, in the structure in which the longitudinal rib is welded to the lower surface of the deck plate, the rib is distorted by heat generated during welding. The height of the second-order moment of the rib is more dominant than the thickness of the rib, and it is desirable to increase the height by thinning the rib to maintain strength and reduce the weight of the rib. When the thickness of the rib is reduced, the influence of strain on heat becomes significant. Therefore, the ribs must be made thick so as not to be distorted by heat, increasing their own weight.
一方、特許文献３の構造は、ボルトにより角形鋼管を鋼床板に固定するものであるため、溶接による熱の変形を受けずに正確に形成することができるという利点がある。また、角形鋼管は既製品として比較的入手し易く、製作時間の短縮が図れる。そして、角形鋼管と角形鋼管の間にかかる重量負荷に対しては、多数の縦リブをボルトにて固定して対応している。 On the other hand, since the structure of Patent Document 3 is for fixing a square steel pipe to a steel floor plate with bolts, there is an advantage that it can be accurately formed without being subjected to thermal deformation due to welding. In addition, square steel pipes are relatively easily available as off-the-shelf products, and the production time can be shortened. And the heavy load applied between a square steel pipe and a square steel pipe respond | corresponds by fixing many vertical ribs with a volt | bolt.
しかし、既製品として提供される角形鋼管は、予めその寸法が決まっており、任意の寸法の角形鋼管を作製しようとすると、非常にコストの高いものになる。従って、特許文献３においては、容易に入手可能な角形鋼管をもとに鋼床板を設計しなければならず、設計の自由度は限定的である。 However, the dimensions of a square steel pipe provided as an off-the-shelf product are determined in advance, and if an attempt is made to produce a square steel pipe having an arbitrary dimension, the cost becomes very high. Therefore, in patent document 3, a steel floor board must be designed based on the square steel pipe which can be obtained easily, and the freedom degree of design is limited.
本発明は、縦リブを有する鋼床板の重量を軽量化しつつ、且つ溶接によらない鋼床板を提供することを目的とする。 An object of this invention is to provide the steel floor board which does not depend on welding, reducing the weight of the steel floor board which has a vertical rib.
上記課題を解決するために本発明の鋼床板は、長方形状に切断された圧延鋼板と、平坦な主面に対して長さ方向へ一定の間隔であってかつ幅方向に一つずつボルト孔が設けられ、前記主面の裏側には前記圧延鋼板の厚さの間隔或いはやや広い間隔で対向する内面が平行であってかつ一定深さの溝が設けられ、前記ボルト孔は前記溝の幅の範囲に重なるように設けられている棒状のブロック継手であって、前記圧延鋼板の対向する一対の長辺が前記溝に嵌合され、前記溝側面を通して前記圧延鋼板を貫通するボルトにより固定、及び／又は接着剤により固定された一対のブロック継手と、前記ブロック継手のボルト孔と同じ一定間隔に透孔が設けられた上下一対の鋼板であって、夫々は前記一対のブロック継手の前記主面に対向して配置され、前記透孔を介して対応する前記ブロック継手のボルト孔に対して螺合されたボルトにより固定されており、前記ブロック継手は、前記ボルト孔が一方の面側に設けられた断面長方形の鋼材の他方の面に対して、２本の断面長方形の鋼材を間隔を開けて平行に溶接により固定して、前記溝が形成されていることを特徴とする。
In order to solve the above-mentioned problems, the steel floor plate of the present invention includes a rolled steel plate cut into a rectangular shape, and bolt holes one by one in the width direction at regular intervals in the length direction with respect to the flat main surface. A groove having a constant depth is provided on the back side of the main surface, the inner surfaces facing each other at an interval of the thickness of the rolled steel sheet or at a slightly wider interval, and the bolt hole has a width of the groove. Is a rod-shaped block joint provided so as to overlap the range of the above, a pair of opposed long sides of the rolled steel plate is fitted in the groove, and fixed by a bolt penetrating the rolled steel plate through the groove side surface, And / or a pair of block joints fixed by an adhesive and a pair of upper and lower steel plates provided with through holes at the same regular intervals as the bolt holes of the block joints, each of which is the main joint of the pair of block joints Placed opposite the surface, KiToruana are fixed by screwed bolts for the corresponding bolt holes of the block joint through the block joint, the bolt holes of rectangular cross section steel provided on one surface side Two grooves having a rectangular cross section are fixed to each other by welding in parallel with a gap therebetween, and the groove is formed .
本発明によれば、溶接に向かない薄い圧延鋼板を利用して、撓み量が少ない軽量の鋼床板を構成することができる。圧延鋼板の厚さは様々なものが取り揃えられており、重量を増加させることなく様々な大きさ強度に対応する鋼床板を提供できるという効果がある。 ADVANTAGE OF THE INVENTION According to this invention, the lightweight steel floor board with few bending amounts can be comprised using the thin rolled steel plate which is not suitable for welding. Various thicknesses of rolled steel sheets are available, and there is an effect that it is possible to provide steel floor boards corresponding to various strengths without increasing the weight.
本発明の実施形態について図を用いて説明する。
図１は鋼床板１００を示しており、図１Ａは側面、図１Ｂは平面を示している。鋼床板１００は、縦リブとして圧延鋼板４の両端に棒状のブロック継手１を配置し、上側、下側のブロック継手１を夫々長方形状の上下一対の鋼板５、９で挟んでいる。圧延鋼板４の厚さは２ｍｍ〜１０ｍｍの範囲の厚さの範囲の中から、鋼床板１００の大きさ、強度に応じて選択される。圧延鋼板４は縦の長さＨは２００ｍｍから１０００ｍｍの範囲で、また、長さは６ｍから２０ｍの範囲で長方形状に切り出される。上下一対の鋼板５、９の厚さは、５ｍｍであって、鋼床板１００の床面積を定義している。圧延鋼板４及び上下一対の鋼板５、９は、一般構造用圧延鋼材であって、ここではＳＳ４００（ＪＩＳ規格）を用いた。上下一対の鋼板５、９も圧延鋼板であるが、圧延鋼板４との混同をさけるため、実施例では単に鋼板と称している。
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a steel floor board 100, FIG. 1A shows a side surface, and FIG. 1B shows a flat surface. The steel floor board 100 arrange | positions the rod-shaped block coupling 1 as both the both ends of the rolled steel plate 4 as a vertical rib, and has pinched | interposed the upper and lower block joint 1 with a pair of rectangular upper and lower steel plates 5 and 9, respectively. The thickness of the rolled steel sheet 4 is selected from the thickness range of 2 mm to 10 mm according to the size and strength of the steel floor board 100. The rolled steel sheet 4 is cut into a rectangular shape with a vertical length H in the range of 200 mm to 1000 mm and a length in the range of 6 m to 20 m. The thickness of the pair of upper and lower steel plates 5 and 9 is 5 mm, and defines the floor area of the steel floor plate 100. The rolled steel plate 4 and the pair of upper and lower steel plates 5 and 9 are general structural rolled steel materials, and SS400 (JIS standard) was used here. The pair of upper and lower steel plates 5 and 9 are also rolled steel plates, but in order to avoid confusion with the rolled steel plate 4, they are simply referred to as steel plates in the examples.
図２に、棒状のブロック継手１は断面Ｕ字状の部材であり、一方側の平坦な主面に長さ方向へ一定の間隔をおいて幅方向に一つずつ雌ネジ山が設けられたボルト孔１１が設けられている。向かい合う裏側には圧延鋼板４が嵌合する溝が設けられている。溝１３は、圧延鋼板４の厚さと同じかやや広い間隔ｗ１を開けられて対向する内面が平行な面であり、深さは一定である。溝１３の両側には溝の幅ｗ１にほぼ匹敵する厚さＷ２の壁部材１４が設けられている。溝１３が設けられた範囲に重なるようにボルト孔１１が配置されている。尚、図においては、ボルト孔１１の直径は溝１３の幅よりも大きく、且つ溝１３の中心位置（図中、一点鎖線）にボルト孔１１の中心位置を重ねているが、溝１３の設けられた範囲（ｗ１の範囲）にボルト孔１１が重なることを条件として、ボルト孔１１の直径は溝１３の幅よりも小さくても良く、また溝１３の中心位置にボルト孔１１の中心位置を重なっていなくても良い。溝１３の両側の壁部材１４には、双方の壁部材１４に貫通する貫通孔１２が長さ方向へ一定間隔に設けられている(図２Ｂを参照)。 In FIG. 2, the rod-shaped block joint 1 is a member having a U-shaped cross section, and is provided with one female screw thread in the width direction at a certain interval in the length direction on a flat main surface on one side. Bolt holes 11 are provided. Grooves into which the rolled steel plate 4 is fitted are provided on the opposite back sides. The groove 13 is a plane whose inner surfaces facing each other with a gap w1 that is the same as or slightly wider than the thickness of the rolled steel plate 4 are parallel, and the depth is constant. On both sides of the groove 13, wall members 14 having a thickness W2 substantially equal to the width w1 of the groove are provided. The bolt hole 11 is arranged so as to overlap the range where the groove 13 is provided. In the drawing, the diameter of the bolt hole 11 is larger than the width of the groove 13 and the center position of the bolt hole 11 is overlapped with the center position of the groove 13 (the chain line in the figure). The diameter of the bolt hole 11 may be smaller than the width of the groove 13 on the condition that the bolt hole 11 overlaps the range (the range of w1), and the center position of the bolt hole 11 is set at the center position of the groove 13. It does not have to overlap. The wall members 14 on both sides of the groove 13 are provided with through holes 12 penetrating the both wall members 14 at regular intervals in the length direction (see FIG. 2B).
図３に鋼床板１００を組立てる様子が示されている。まずブロック継手１に設けられた貫通孔１２と同じ間隔で、かつ圧延鋼板４の長辺が溝に嵌合されたときに端面が溝の底面に接触する位置に、圧延鋼板４に貫通孔４１を穿孔する。そして、圧延鋼板４の夫々の長辺に対して夫々ブロック継手１を配置して、夫々の溝１３に嵌合させて壁部材１４を通して圧延鋼板４の貫通孔４１に対してボルト９ａを貫通させてブロック継手１と圧延鋼板４とをナット９ｂにより固定する（図３Ａ）。 FIG. 3 shows how the steel floor board 100 is assembled. First, the through hole 41 is formed in the rolled steel plate 4 at the same interval as the through hole 12 provided in the block joint 1 and at a position where the end surface comes into contact with the bottom surface of the groove when the long side of the rolled steel plate 4 is fitted into the groove. Perforate. And the block joint 1 is arrange | positioned with respect to each long side of the rolled steel plate 4, respectively, it is made to fit in each groove | channel 13, and the volt | bolt 9a is penetrated with respect to the through-hole 41 of the rolled steel plate 4 through the wall member 14. Then, the block joint 1 and the rolled steel plate 4 are fixed by the nut 9b (FIG. 3A).
次に、鋼板５に対して、ブロック継手１のボルト孔１１と同じ間隔で透孔８を開けておき、鋼板５をブロック継手１の平坦な主面に対向して配置させる。そして、透孔８を介して圧延鋼板４の長辺の一方側に配置されたブロック継手１のボルト孔１１に螺合してボルト７により鋼板５をブロック継手１に固定する。同様に圧延鋼板４の長辺の他方側に対向して配置されたブロック継手１に対して鋼板９の透孔８を介してボルト孔に螺合して鋼板９をブロック継手１に固定する。 Next, the through holes 8 are opened at the same interval as the bolt holes 11 of the block joint 1 in the steel plate 5, and the steel plate 5 is arranged to face the flat main surface of the block joint 1. Then, the steel plate 5 is fixed to the block joint 1 with bolts 7 by screwing into the bolt holes 11 of the block joint 1 arranged on one side of the long side of the rolled steel plate 4 through the through holes 8. Similarly, the steel plate 9 is fixed to the block joint 1 by screwing into the bolt hole through the through-hole 8 of the steel plate 9 with respect to the block joint 1 arranged to face the other side of the long side of the rolled steel plate 4.
圧延鋼板４の板厚は長さに比較して薄く、長い距離を溶接しようとすると、熱で歪んで形状変化を起してしまう、鋼床板１００ではブロック継手１を用いた締結であるので、圧延鋼板４にゆがみなどの形状変化は起こらない。 The plate thickness of the rolled steel plate 4 is thin compared to the length, and when it is attempted to weld a long distance, the steel floor plate 100 is fastened using the block joint 1 because the shape changes due to heat distortion. No shape change such as distortion occurs in the rolled steel sheet 4.
鋼床板１００における圧延鋼板４の設置箇所の前後箇所Ｕを切り出した場合において、箇所Ｕの断面形状は、Ｉ字形状である。鋼板５と鋼板９とブロック継手１の平坦な主面はボルト７により密着状に固定されるため、鋼板５と鋼板９と圧延鋼板４とが一体的に接続された如き構造が実現される。鋼床板１００の厚さをＨ、箇所Ｕの幅をＢ、鋼板５と鋼板９の間隔をｈとした場合、ブロック継手１の自体による断面２次モーメントＩａを無視すると、箇所Ｕの断面２次モーメントＩａは、
（１）−−−−Ｉａ＝（ＢＨ３−（Ｂ−ｄ）ｈ３）／１２
により近似できる。
When the front and rear locations U of the installation location of the rolled steel plate 4 in the steel floor plate 100 are cut out, the cross-sectional shape of the location U is an I-shape. Since the flat main surfaces of the steel plate 5, the steel plate 9, and the block joint 1 are fixed in close contact with the bolt 7, a structure in which the steel plate 5, the steel plate 9, and the rolled steel plate 4 are integrally connected is realized. When the thickness of the steel floor plate 100 is H, the width of the location U is B, and the interval between the steel plate 5 and the steel plate 9 is h, the secondary secondary moment Ia due to the block joint 1 itself is ignored. Moment Ia is
(1) ---- Ia = (BH 3 - (B-d) h 3) / 12
Can be approximated by
式に明らかなように、圧延鋼板４の厚さよりも、鋼板５と鋼板９の間隔すなわち、圧延鋼板４の幅ほうが、断面２次モーメントＩａの値については支配的である。ブロック継手１を用いることにより、容易に所望の厚さのものが入手可能な一般構造用圧延鋼材である鋼板を鋼床板の縦リブとして用いることができるため、どのような強度、大きさの鋼床板１００に対しても適切な厚さの鋼板を採用して容易に対応して製造することができる。このように設計の自由度は格段に向上する。 As is apparent from the equation, the distance between the steel plate 5 and the steel plate 9, that is, the width of the rolled steel plate 4, is more dominant than the thickness of the rolled steel plate 4 in terms of the value of the secondary moment of inertia Ia. By using the block joint 1, a steel sheet, which is a general structural rolled steel that can be easily obtained with a desired thickness, can be used as the vertical rib of the steel floor plate, so that any strength and size of steel can be used. The floor plate 100 can be manufactured easily by adopting a steel plate having an appropriate thickness. Thus, the degree of freedom in design is greatly improved.
ブロック継手１と鋼板５或いは鋼板９の接続は、圧延鋼板４の延長上に配置されるボルト孔１１により締結されるため、鋼板５或いは鋼板９に加わる曲げ力直接的に圧延鋼板４に伝達されることになり、上記式（１）により求められる断面２次モーメントＩａに近い性能を発揮することができる。また、ブロック継手１を用いることにより、圧延鋼板４の板厚よりも大きい直径のボルト７を使用することができるので、強度を確保することができ、かつ一定間隔において、１本のボルト７を使用するだけであるので、鋼床板１００を製造する工程も短縮化することができる。 Since the connection between the block joint 1 and the steel plate 5 or the steel plate 9 is fastened by the bolt hole 11 arranged on the extension of the rolled steel plate 4, the bending force applied to the steel plate 5 or the steel plate 9 is directly transmitted to the rolled steel plate 4. Therefore, the performance close to the cross-sectional secondary moment Ia obtained by the above formula (1) can be exhibited. Further, by using the block joint 1, a bolt 7 having a diameter larger than the thickness of the rolled steel plate 4 can be used, so that the strength can be ensured and one bolt 7 is attached at a constant interval. Since it is only used, the process of manufacturing the steel floor board 100 can also be shortened.
図４は、ブロック継手１を作製する過程を示す図である。ブロック継手１は、断面長方形の角型の鋼材から溝加工や穿孔により製作しても良いが、安価にかつ容易に、様々な板厚の圧延鋼板４に対応できるようにし、かつ容易に入手できる鋼材を用いて作製する例を示す。ここにおいて、ブロック継手１に固定される圧延鋼板４（リブ）の板厚は、２ｍｍであるとする。 FIG. 4 is a diagram illustrating a process of manufacturing the block joint 1. The block joint 1 may be manufactured from a square steel material having a rectangular cross section by grooving or drilling. However, the block joint 1 can be easily and easily obtained for a rolled steel plate 4 having various plate thicknesses at low cost. An example of using a steel material is shown. Here, the plate | board thickness of the rolled steel plate 4 (rib) fixed to the block joint 1 shall be 2 mm.
６ｍｍ×３ｍｍの断面長方形の鋼材１５を、その主面に雌ネジ山を形成したボルト孔１１（直径４ｍｍ、深さ２ｍｍ）を穿孔する（図４Ａ）。壁部材１４となる５ｍｍ×２ｍｍの断面長方形の２本の鋼材１６に貫通孔（直径３ｍｍ）１２を穿孔する（図４Ｂ）。２本の鋼材１６の間隔を２ｍｍ開けて、鋼材１５の主面の裏側に配置して幅２ｍｍ、深さ５ｍｍの溝１３を形成して、その側面を溶接して固定する（図４Ｃ）。この溶接は、全域に渡る溶接でなくても良く、離散的な溶接で良い。 A steel material 15 having a rectangular cross section of 6 mm × 3 mm is drilled with a bolt hole 11 (diameter 4 mm, depth 2 mm) having a female thread formed on its main surface (FIG. 4A). A through-hole (3 mm in diameter) 12 is drilled in two steel members 16 having a rectangular cross section of 5 mm × 2 mm that will be the wall member 14 (FIG. 4B). The space | interval of the 2 steel materials 16 is opened 2 mm, it arrange | positions in the back side of the main surface of the steel materials 15, forms the groove | channel 13 of width 2mm and depth 5mm, and the side is welded and fixed (FIG. 4C). This welding may not be welding over the entire area, but may be discrete welding.
上記実施例においては、ボルト孔は溝に貫通していない例を示したが、ボルトが圧延鋼板４と干渉しなければ、貫通していてもかまわない。また、ブロック継手１と圧延鋼板４とを接続するために、ボルトを用いたが、接着剤と併用しても良い。また、火災により接着剤の消失が懸念されることのない箇所においては、ブロック継手１と圧延鋼板４とを固定は接着剤のみを用いるものでも良い。 In the said Example, although the bolt hole showed the example which has not penetrated the groove | channel, if the bolt does not interfere with the rolled steel plate 4, it may penetrate. Moreover, although the bolt was used in order to connect the block joint 1 and the rolled steel plate 4, you may use together with an adhesive agent. Further, in a place where there is no concern about the disappearance of the adhesive due to a fire, the block joint 1 and the rolled steel plate 4 may be fixed using only the adhesive.
また、上記実施例においては、圧延鋼板４の長さに相当する長さを持つブロック継手１を用いる例を示したが、長さの短いものを複数個利用しても良い。 Moreover, in the said Example, although the example using the block joint 1 with the length corresponded to the length of the rolled steel plate 4 was shown, you may utilize several things with short length.
１ ブロック継手
４ 圧延鋼板
５、９ 鋼板
1 Block joint 4 Rolled steel sheet 5, 9 Steel sheet
Claims (2)
平坦な主面に対して長さ方向へ一定の間隔であってかつ幅方向に一つずつボルト孔が設けられ、前記主面の裏側には前記圧延鋼板の厚さの間隔或いはやや広い間隔で対向する内面が平行であってかつ一定深さの溝が設けられ、前記ボルト孔は前記溝の幅の範囲に重なるように設けられている棒状のブロック継手であって、前記圧延鋼板の対向する一対の長辺が前記溝に嵌合され、前記溝側面を通して前記圧延鋼板を貫通するボルトにより固定、及び／又は接着剤により固定された一対のブロック継手と、
前記ブロック継手のボルト孔と同じ一定間隔に透孔が設けられた上下一対の鋼板であって、夫々は前記一対のブロック継手の前記主面に対向して配置され、前記透孔を介して対応する前記ブロック継手のボルト孔に対して螺合されたボルトにより固定されており、
前記ブロック継手は、前記ボルト孔が一方の面側に設けられた断面長方形の鋼材の他方の面に対して、２本の断面長方形の鋼材を間隔を開けて平行に溶接により固定して、前記溝が形成されていることを特徴とする鋼床板。
A rolled steel sheet cut into a rectangular shape;
Bolt holes are provided at regular intervals in the length direction with respect to the flat main surface and one by one in the width direction, and on the back side of the main surface at intervals of the thickness of the rolled steel plate or at slightly wider intervals. The opposed inner surfaces are parallel and have grooves of a certain depth, and the bolt holes are rod-shaped block joints provided so as to overlap the range of the width of the grooves, and are opposed to the rolled steel plates. A pair of long sides fitted into the groove, fixed by a bolt that penetrates the rolled steel sheet through the groove side surface, and / or a pair of block joints fixed by an adhesive;
A pair of upper and lower steel plates provided with through-holes at the same regular intervals as the bolt holes of the block joint, each being arranged to face the main surface of the pair of block joints, and corresponding via the through-holes Fixed by a bolt screwed into the bolt hole of the block joint ,
The block joint is fixed to the other surface of the steel material having a rectangular cross-section with the bolt holes on one surface side by welding two steel materials having a rectangular cross-section at a distance in parallel, A steel floor board in which grooves are formed.
A through hole penetrating a wall member forming a groove of the block joint and penetrating a long side of the rolled steel sheet fitted into the groove is provided, and the block joint and the rolled steel sheet are formed by bolts through the through hole. The steel floor board according to claim 1, wherein and are fixed.
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