巻号一覧
2 巻 (1952 - 1953)
- 2 号 p. 33-
- 1 号 p. 1-
2 巻, 2 号
選択された号の論文の9件中1～9を表示しています
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論文
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秋田 一雄1953 年 2 巻 2 号 p. 33-35
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーIn this experiment, charcoal was burnt in a well ventilated electric furnace at high temperature, and its combustion speed was measured by means of a thermal balancing method. The result of this was disposed of by the theory presented by the author (same magazine vol. 1, no. 2. p. 44). In this, it has been found that the combustion speed is governed by how rapidly oxygen diffuses in the thin film which covers the surface of the burning charcoal.抄録全体を表示PDF形式でダウンロード (285K) -
岡島 慶三郎, 矢治 賴夫1953 年 2 巻 2 号 p. 36-38
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーIn the previous report, we performed the fundamental experiments on wooden walls and glass windows, and obtained some results. In this report, we firstly investigated the prevention effect against fire by the running water film for cement mortar walls 1 cm and 2 cm in thickness, secondarily investigated the sprinkling state of water for various drencher heads and researched the data on the improvement and arrangement of them.
On cement mortar walls, the minimum amount of water required without burning them is about half amount of water required on wooden walls.抄録全体を表示PDF形式でダウンロード (263K) -
金原 寿郎, 末 清一1953 年 2 巻 2 号 p. 39-41
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーWhen lead wires from a neon-transformer (usually 7～15 kV leakage type) lighting neon tubes for advertisement contact through a board, electric current passes through it and the board may be heated to ignition, although the current is only of the order of several 10 mA. Fires due to this planking ignition have been reported frequently of late years.
To investigate the mechanism of this ignition, electric tension of about 15 kV from a leakage transformer was applied lengthwise to a board of about 10cm × 5cm × 5mm and the state of ignition was observed.
Burned zig-zag channels of 2～3 mm diameter, at the top of which ignition is taking place, extend from both side along the soft tissue of the wood, and when these channels are joined together, the current attains to its maximum value 22 mA, showing that the board is broken down electrically. Thus, by the heat produced in the carbonized channel, ignition begins at several points of the channel, and finally the board is destroyed.
If the board is initially drenched, vaporization of water in the board begins in the first place and when the board has been nearly dried up, channels begin to appear and extend easily through out the board.
Mechanism of the channel extension and the effect of drenching to make the board to be easily destroyed were also considered.抄録全体を表示PDF形式でダウンロード (332K) -
斎藤 二郎1953 年 2 巻 2 号 p. 42-45
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーThe inner temperature of concrete when reinforced concrete construction is suffering from fire, can be calculated theoretically ; and its investigated results concur with experimental consequence considerably.
From its results, the concrete covering to prevent temperatural lowering of strength of steel can be inferred.
The theory of thermometric conduction is based on fundamental linear or secondary differential equation, that is
(∂θ)/(∂t)=a(∂2θ)/(∂x2) (1) 0<x<+∞ a = diffusivity
or thermometric conductivity of concrete.
(∂θ)/(∂t)=a((∂2θ)/(∂x2)+(∂2θ)/(∂y2)) (2) 0<x<+∞
0<y<+∞
at (1) eq. boundary conditions are
θ=Θ at x=0
θ=θ0 at t=0
Then its solution is
θ=(Θ-θ0){1-Φ(x/2√at)}+θ0 (3)
in this eq. Φ(x)=2/√π ∫x0 e -α2dα (4)
It is known as probability function that is Gauss’ theory of errors.
In (3) eq. when x=1(cm), Θ=1120°C, θ0=20°C, a=0.0012m2/hr ; θ is approximately coincide with A. S. T. M. fire standard curve, and when x=2(cm), θ is equal to surface temperature of concrete that is suffering from A. S. T. M. standard fire. And then inner temperature of concrete is expressed as follows.
θ=1100 [1-Φ((x+2)/(2√at))] -40 (5)
θ≧100°C a=0.0012
θ=1100 [1-Φ((x+2)/(2√at))]+20 (6)
θ≦100°C a=0.0024
x=depth from heated concrete surface (cm)
But at the corner of concrete, fire frame heats at the two surfaces that are x-axis and y-axis surface. In this case, (4) eq. is fundamental equation. Boundary conditions are
θ=Θ at x=0, y=0
θ=Θ0 at t=0
Its solution is
θ=Θ+(θ0-Θ)Φ((x/2√at), (y/2√at)) (7)
Φ((x/2√at,) (y/2√at))=4/π ∫ x/2√at 0 ∫ y/2√at 0
e -(α2+β2)dαdβ (8)抄録全体を表示PDF形式でダウンロード (503K) -
喜多 薫1953 年 2 巻 2 号 p. 46-48
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーThe calculation of theoretical character of the fire detector by pneumatic expansion has been reported on this bulletin Sept. 1951.
Then this report is one of the theoretical result, in continuation of above subject, in the case of the detector has been placed in the hot air which temperature increasing linear or intermitted periodically.抄録全体を表示PDF形式でダウンロード (181K) -
三山 醇, 喜多 薫1953 年 2 巻 2 号 p. 49-51
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーSeveral method on analysis of pressure loss and amount of water flow at the pipeline networks has been suggested.
However, they were too much complicated.
I have observed a similarity on between the Hazen and William formula and current voltage character of tungsten filament peculiar type of electric lamp. I intend to suggest a new simple method for analysis of this item.
This simple method will be calculated by measuring the value of voltage and current of the electric network formed by using this peculiar electric lamp.抄録全体を表示PDF形式でダウンロード (245K) -
桜井 高景, 泉 富雄1953 年 2 巻 2 号 p. 52-54
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーIn preceding report, we suggested the fire retarding effect of the penetrating foaming materials, H3PO4, to the wooden system.
Although the penetration quantity was appreciably much more than as expected, it was concluded that the effect of the penetrating H3PO4 was not as important as compared with that effect of the foaming tendency and the endothermic heat decomposition of the paints.
The conclusion above was induced by the following experimental facts :
(1) Analysis of the temperature (which was measured at the back of the test pieces) - time curve obtained when modified JIS fire retardness test was performed on the paints of the urea resin-NH4H2PO4-anilin· H3PO4 system.
(2) Penetration quantity of H3PO4 was not proportional to the fire-retardness of the paints of the urea-paraformaldehyde-NH4H2PO4-starch and the urea resin-NH4H2 PO4-starch system.
(3) The depth of the penetration was an extent of 1 mm from the surface of the test pieces.抄録全体を表示PDF形式でダウンロード (335K) -
桜井 高景, 左右田 信一1953 年 2 巻 2 号 p. 55-57
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーThis report shows the new test method of airfoam solution in laboratory. This contains
that :
(1) Test of Foam generating capacity
(2) Test of Expansion
(3) Test of Stability
(4) Test of Adaptability to various liquids
(5) Fire-proof test
(6) Test of Deterioration
(7) Test by Sea-water抄録全体を表示PDF形式でダウンロード (279K) -
碓井 憲一1953 年 2 巻 2 号 p. 58-60
発行日: 1953年
公開日: 2015/04/25
ジャーナル フリーBefore this report, the experimental formulas of rational value of water poured burning timber, that had several carbonized depth and was at several velocity of wind, have been attained. In this report, the rational value of water is calculated and analyzed in the hypothetical house of which surface area of timbers is chiefly calculated and of which process of fire is decided.抄録全体を表示PDF形式でダウンロード (249K)
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