초록 ▼

An apparatus and method are disclosed which are suitable for detecting leakage from manholes. The apparatus of the invention comprises a rim upon which an inflatable tube is mounted, a pressure gauge for measuring gas pressure, and a valve through which air or a similar gas may be introduced through

An apparatus and method are disclosed which are suitable for detecting leakage from manholes. The apparatus of the invention comprises a rim upon which an inflatable tube is mounted, a pressure gauge for measuring gas pressure, and a valve through which air or a similar gas may be introduced through the apparatus into the manhole is included. The apparatus may further include a duct which passes entirely through the assembly and which includes a chain or cable attached to the apparatus or the cap of the duct and the other end of which may be secured within the manhole itself. In the practice of the method of this invention, the apparatus is inserted into the manhole with the safety cable attached (if such is provided) and the tube portion of the apparatus is inflated to provide an airtight seal. The testing gas is introduced into the manhole to a predetermined pressure as measured on the gauge and, after a suitable time has elapsed, a second reading may be taken to determine any drop in pressure which may be attributable to leakage from the manhole.

대표청구항 ▼

An apparatus for testing leakage from manholes comprising: (a) a generally circular rim of rigid construction (b) an inflatable bag circumscribing said rim, said rim and bag resting on (c) a generally circular bottom plate to form an assembly, said assembly having a radius of somewhat less than the

An apparatus for testing leakage from manholes comprising: (a) a generally circular rim of rigid construction (b) an inflatable bag circumscribing said rim, said rim and bag resting on (c) a generally circular bottom plate to form an assembly, said assembly having a radius of somewhat less than the manhole to be tested; (d) gas inlet means connected to said bag to allow its inflation and deflation; (e) gas inlet means extending longitudinally through said assembly to allow the introduction of a gas into said manhole after said assembly is in place; (f) means associated with said assembly adapted to receive a gauge intended to measure gas pressure of the manhole; (g) a duct extending longitudinally through said assembly from the rim side to the bottom plate side; (h) cap means for said duct at the rim side; and, (i) means within said duct for releasably securing a cable to a wall of said duct whereby a cable may be secured at one end to said assembly and at its other end to a wall of said manhole.