Leakage of water investigation

◎ An abstract of leakage of water investigation
A leakage of water investigation includes a lot of kinds, infrared rays video system, fluorescent dyestuff liquid percolation test, being buried in water examination, gas detection method. We use each investigation method and distribute it by the leakage of water situation and each investigation method investigates an invasion mouth of leakage of water or investigates the stay diffusion situation of rainwater.
◎ infrared rays video system is suited for the method how detection does liquid to stay between water resistant layer and slab and the roof and slab and inside of external wall, but, as for specifying an invasion mouth of rainwater, there are many cases that are difficulty.
◎Fluorescent dyestuff percolation test scatters fluorescent dye when we can specify an invasion mouth of rainwater by range of degree that there is with the leakage of water situation and preliminary survey, and water outlet of rainwater can confirm it by a flowing out thing.
It is difficulty in the case that range of an invasion mouth cannot specify and a leakage of water at the time of strong wind and a leakage of water by a capillary phenomenon.
◎An being buried in water test is a method enforced at a point buried in water in normal like bathroom and a swimming pool, a balcony, and it is a leakage of water examination of enclosed space. We let level of water change at any time, and we dissolve chemical substance in water, and there is methods by test of water.
◎Gas detection method investigates an invasion mouth of rainwater. We press halogen gas from water outlet of rainwater and investigate it by halogen gas detector. The pressure of gas injection is 1.7kg / �C (atmospheric pressure +0.7kg/�C) from 1.4kg / �C, which is osmotic pressure of rainwater. Temporary scaffold is necessary for this method when we cannot predict an invasion mouth of rainwater, because we need to do detection of the whole area of external wall and the roof. In addition, this inquiry method cannot detect rainwater passage path. As a method to do detection of passage path of rainwater, investigation by infrared rays video system is suited.

Gas detection method

1) Preliminary inspection of leakage of water situation: We examine what kind of rain a leak of water occurs in, for example, it occurs after the rain immediately, or several hours later, or only of strong wind, and the relation of rainfall and time which a leak of water ends in. Perhaps we diagnose color or a smell of leak of water by asking questions. In addition, we confirm the situation of finishing material of a leak of water point and judge it whether leak of water probe by gas detection is with ability.
2) We glue jig for gas injection (gas hose carrier) together with an epoxy adhesive to the most intense point of leak of water. By the situation, more than one get this jig.
3) We do filling the crack, the pinhole, the honeycomb which exists in perimeter of a leakage of water point with sealant, and prevent effluence of gas.
4) We wait for drying hardening more than 12 hours.

5) We connect gas injection jig and a compressor for gas injection with a gas hose and adjust gas pressure and start injection.
6) We coordinate gas detector by standard gas.
7) We start gas detection after gas injection for approximately 15 minutes.
8) Even if effluence of gas is discovered from one point, we inspect other locations so that possibility invading from other site becomes clear from past investigation experience. We can suppose decision of coverage from relation with rain start time and leakage of water start time.
9) We do gas detection in the whole area of external wall and the roof.

Infrared rays investigation method

Infrared ray
Infrared ray is a kind of electromagnetic wave. Name of electromagnetic wave changes from a short thing of wave length. It is radioactive ray, ultraviolet ray, visible ray, near infrared ray, middle infrared ray, far infrared ray, radio wave. Infrared ray video system is the machine that detection does wavelength range of 12-16 μ m (long wavelength) and 3-6 μ m (small wavelength) of middle infrared ray. This infrared ray is hardly absorbed by atmosphere, and it is called "window of atmosphere" generally. Infrared ray is radiated from every matter, and quantity of the infrared ray is in approximate proportion to temperature. It is infrared ray video system that utilized this principle. Infrared-rays video system measures surface temperature of matter with face unit, and we turn it into pictorial image.

Leakage of water investigation by infrared rays
Infrared radiation is the device which does detection of surface temperature, but surface temperature changes by movement of thermal energy with internal and external parts. This mechanism becomes a figure of lower part. Solar heat energy is propagated from the surface of the roof inside when water exists on the way, surface temperature becomes lower than the part which there is not water, because thermal energy propagated by the layer which stays of water to a boundary to the inside and the surface temperature decreases so that specific heat of water (the quantity that it is saved heat) is big. We catch this situation with infrared rays video system and investigate it.

When we compare specific heat simply, by order of water > asphalt > air, water saves thermal energy most a lot. Infrared rays video system measures a quantity of infrared rays emitted from object naturally, and it is a device it converts it into temperature, and to indicate, it is not a device it irradiates heat of infrared rays from the main body, and to measure.