Pipe piece elastic sealing gasket water tightness testing method considering soil body influences

Abstract

The invention relates to a pipe piece elastic sealing gasket water tightness testing method considering soil body influences.An adopted device comprises an air pump system, a main testing system, a pressurizing water tank system and a data collection system.The main testing system comprises a main testing box with the open bottom.A sealing top cover is arranged at the upper portion of the main testing box.A detachable pressurizing air bag is connected to the top cover, and a precision pressure adjusting valve and a digital display pressure gauge are fixedly arranged on the top cover.A micro hole piezometer is arranged at the lower portion of the main testing box.The bottom of the main testing box is connected with two L-shaped adjustable base plates in a sealed mode through an elastic sealing gasket at the lower portion of the main testing box and elastic sealing gaskets of the L-shaped base plates.The two L-shaped adjustable base plates are connected through a lead screw.Grooves are formed in the two L-shaped adjustable base plates and are used for fixing the elastic sealing gaskets of the L-shaped base plates.The testing method comprises the steps that the lead screw is adjusted, a slit width corresponds to the shield tunnel pipe piece opening amount, and water leakage pressures corresponding to the pipe piece opening amount is measured.The testing method can estimate the shield tunnel pipe piece elastic sealing gasket water tightness phenomenon.

Description

technical field [0001] The invention relates to a test method for watertightness of segment elastic sealing pads considering the influence of soil, which is mainly suitable for evaluating and predicting the watertightness of shield segment elastic sealing pads. Background technique [0002] Shield tunnels are generally assembled from many impermeable concrete segments. Due to the uneven settlement of the tunnel, local water leakage is prone to occur during tunnel construction and operation. Improper handling will cause disasters and cause huge environmental damage. impact and economic loss. Detecting the critical water leakage opening of the shield segment elastic gasket under different water pressures can not only reflect the quality and performance of the segment elastic gasket itself, but also reflect the safety status of the built tunnel, and can also be used for related scientific research , has great practical significance. [0003] The traditional test method is sim...

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Problems solved by technology

[0003] The traditional test method is simply to test the watertightness of elastic gaskets, such as "Polymer Waterproof Materials Part 4: Rubber Gaskets for Shield Tunnel Segments" (GB18173.4-2010) using simulated tubes The test methods carried out by the water pressure test device of the "T" type and "I" type assembled joints did not take the soil into consideration, neglected the influence of soil particles on the elastic gasket, and could not fully reflect the segment Performance under actual operating conditions

In fact, for tunnels located in the soil, due to the interaction between the soil and the elastic gasket, there is a certain deviation between the critical leakage opening of the segment measured by the traditional experimental method and the actual value.

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