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ness of the wall, and when horizontal channel is to be made, its depth shall bs less than 1/3 of the thickness of wall while the length shall not exceed 3 meters. (Wall of Wooden Frame Masonry Construction or Steel Frame Masonry Construction) Article 59. Part of masonry construction in the j wall of wooden frame or steel frame masonry construction shall be tied firmly into wooden frame or steel frame with bolts, spikes and other iron wares. (Hand Railing and Railing Wall) Article 60. Hand railing or railing wall shall no*t be constructed ©f masonry unless its top is tied by reinforced concrete wall girder. (Masonry Fence) Article 61. Masonry fence shall satisfy the following requirements : (1) Height shall not exceed 3 m.; (2) Thickness at any part of wall shall be more than 1/10 of the height, measured from that part to the top of that wall; (3) At every 4 m. or less of the length of wall, there shall be buttress walls (excluding wooden construction) projecting out of the face of wall more than 1.5 times its thickness, of that point unless the thickness of wall in that part is more than 1.5 of the wall thickness specified in the provisions of the preceding item. (Supports, etc. of Principal Structural Part for Structural Strength) Article 62. Principal masonry part shall not be supported by any part of wooden structure. Section 5 Steel Frame Construction (Scope of Application) Article 63. The provisions of this Section shall apply to part of steel construction in steel frame building, steel skeleton reinforced concrete building or building constructed of steel frame combined with other construction such as masonry, etc. (Materials) Article 64. No cast iron shall be used in part receiving stresses other than compression or stress caused by contact. (Effective Slenderness Ratio of Compression Member) Article 65. Effective slenderness ratio (ratio of buckling,length to the radius of gyration; hereinafter the same) of steel compression member (meaning material to take compressive stress; hereinafter the same) as principal part for structural strength shall not exceed 200 for column, 250 for members other than column. (Foot of Column) Article 66. Foot of column as principal structural part shall be fixed to footing by anchor bolts -12- unless it is firmly fixed to footing by other special constructions or designed as pin support. (Joints) Article 67. Joints of steel shapes as principal structural part shall either be riveted or welded joint, except where bolts are permitted to be used as in the cases given in any of the follow- I I j i ing items: (1) In the case where total weight of steel shapes used in structural part of a building is less than 10 tons, and bolted part is embedded in concrete, or nuts are fixed by welding, or lock nuts are used so that bolts will not be loosened ; (2) In the case where the joint is extremely difficult for riveting or welding. 2 Joints and connections as the principal structural part shall, by means of splice piece riveted or welding, be so constructed that entire stress existing at that point may be transmitted. In this case, the end of column shall be perfectly planed, and when no tension stress is not made to exist, by making the contact or joint good and tight, the structure may be considered as one of which that compression stress and bending moment at that point is transmitted up to 1/4 (1/2 at foot of column). (Rivet and Bolt) Article 68. Spacing of rivet or bolt shallbe greater than 2.5 times its diameter center to center. 2 Riveting shall be done so that rivet shall filland fit the hole perfectly tight. 3 No holes for bolts shall be made larger than0.5 mm.in diameter of bolt used. (Arrangement of Bracings, Walls, etc.) Article 69. Excluding the case where structures of upright framings, floor system and roof trusses are proved to be structurally safe through structural calculation, steel shape or bar bracings, or reinforced concrete walls, roofslabor floor slabs shall be arranged to suit. (Prevention of Corrosion in Structural Materials) Article 70. Steel shapes used in principal structural "part shall be protected by non-corrosive paints or shall be embedded in concrete or in light protective concrete with no rust forming quality for steel. Section 6 Reinforced Concrete Construction (Scope of Application) Article 71. The provisions of this Section shall apply to part of reinforced concrete in reinforced concrete building, steel skeleton reinforced concrete building constructed of reinforced concrete combined with other construction such as mason" ry, etc. 2 The provisions of Article 72, Article 75 and Article 79 of this Section only shall apply to
uildings of height less than 4 meters and with total floor area less than 30 sq.m., or to fence with height not over 3 meters. (Materials for Concrete) Article 72. Materials to be used for concrete in reinforced concrete buildings shall satisfy the requirements in the following items : (1) Sand, gravel, crushed stones and water shall be free from acids, salts, organic matters or particles of mud liable to cause rusting of steel or injurious to obstruct normal process of setting of concrete; (2) Gravel or crushed stones shall be hard and of size to go through easily between spaces in reinforcing bars and space between reinforcing bar and form. (Joints and Fixing of Reinforcing Bars) Article 73. Ends of reinforcing bars shall be hooked to prevent from slipping. 2 Joint of main bar shall be at a partwhere tension stress acts least excepting the case of welding, the length of lap shall be more than 25 times its diameter (in the case of making joints of main bars of different diameters, the smaller diameter; hereinafter the same in this Article). However, in case the joint may not be made at a point where tension is not working at full stress, then, the lap shall be more than 40 times the diameter or bars. 3 Of the tension steel bars in beam framed with column, excepting the case of welding with main bars in column, the length of anchor shall benot less than 40 times its diameter. (Proportion of Concrete Mix) Article 74. Concrete to be used in reinforced concrete construction shall show compressive•E strength of more than 90 kg/cm2 at age of 28 days. 2 Water-Cement ratio of concrete shall be kept down from the value obtained by the following formula according to the required strength for structural purpose, except in cases where it is determined by the testing of strength by Japanese Industrial Standard A 1108 (Method of testing compression stress) : In case of Cement commonPortland In case of high early strength Portland Cement In case of slag cement or silica Cement 0.85 K "F+0.64 IT 0.47 K "F+0.05K 1.4K "F+1.48K In above formula, F, K and x shall showthe following values respectively : F=Compressive strength of concrete at age of28 days given in table in Article 91. K=Compressive strength of mortar at age of 28 days according to Japanese. Industrial Standard R 5210 for Portland Cement. However, in case the period of 2 weeks after concrete is poured happens to fall on a month having average temperature for that month less than 10°C, the value of the stress to be decreased by 50 kg/cm2. x-Water-Cement ratio 3 Mixture of Concrete shall be determined so that the product shall be uniform, and compact. (Curing of Concrete) Article 75. Curing of concrete shall be done so as to keep the temperature of concrete above 2°C, while pouring and during the period of 5 days after concrete is poured and care shall be taken to prevent it from setting and hardening by dryout or vibration. (Removing of Supports of Forms) Article 76. Supports for forms for beams and slabs as principal structural part shall not be removed before 6 weeks (4 weeks in case of roof floor or in case of no floor bsing directly above). 2 The provisions of the preceding paragraph shall not apply in case high early-strength Portland cement is used or other cement is used and in case } of the period of time or more mentioned in said paragraph has elapsed and only in case building official approves that he has no objection thereto from standpoint of structural strength due to favorable condition in respect to temperature, humidity and others. (Construction of Columns) Article 77. Construction of columns as principal structural part shall satisfy the structural requirements as provided for in the following items : (1) Main bars shall consist of more than 4 reinforcing bars with properly spaced ties ; (2) Spacing of ties shall be less than 30 cm., and at the same time not over 15 times the diameter of smallest bars used ; (3) Least diameter of column shall be more than 1/15 of the distance between the main supports unless it is checked as safe in consideration of its slenderness ratio in structural calculation. (4) Sum of area of main bars shall be not less than 0.8% of the area of cross-section of concrete (if area of bar exceeds the area under the provision of the preceding paragraph or under the result of structural calculation, that required area,, (Construction of Beams) Article 78. Beam as principal part for structural strength shall be reinforced double, and shall have stirrups at space not exceeding 3/4 of the depth of a beam. (Thickness of Protection for Embedded Bars) Article 79. Thickness of concrete covering of the -13-
Page 1 and 2: OFFICIAL GAZETTE 60VERHMENTPRMHN8A8
Page 3 and 4: (Law No. 186 of 1948) and outline o
Page 5 and 6: horizontal distance prescribed in s
Page 7 and 8: (5) The end of soil pipe from urina
Page 9 and 10: 2 In cases where, by regulation and
Page 11: (Foot i ng) Article 53. Footing to
Page 15 and 16: according to ttie actual condition
Page 17 and 18: 2 In the case of calculating compre
Page 19 and 20: Special administrative agency shall
Page 21 and 22: ing the case of determining by load
Page 23 and 24: A 8 Specially heavy loads on floor,
Page 25 and 26: concrete construction for structura
Page 27 and 28: 4 2 Exterior walls in one story bui
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Page 31 and 32: (Distance by Walk to Stairways) Art
Page 33 and 34: and at the same time more than 30cm
Page 35 and 36: (In Cass there is Wall-surface Line
Page 37 and 38: uilding administration or practical
Page 39 and 40: 2 In case application for confirmat
Page 41 and 42: Annexed Form No. 1 Copy (B 5) Copy
Page 43 and 44: I a§ I o .2gft P s •EII cvi o a
Page 45 and 46: Form No. 4 Copy (B 5) Copy Notice f
Page 47 and 48: Form No. 7 (front page) S.5cm Date
Page 49 and 50: w5 1 u p d 55 £
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