Water body sampling unit weight detection method in immersed tunnel pipeline section drift floating immersion and water sampler

Abstract

The invention provides a water body sampling unit weight detection method in immersed tunnel pipeline section drift floating immersion, which includes the following steps: step 1, confirming a sampling point and sampling depth; step 2, sampling a water sample through a card cover type water sampler as per the sampling point and the sampling depth confirmed in step 1, and step 3, adopting the Archimedes principle in a laboratory and calculating the water sample unit weight through the method as per the variation of weight of a standardized block in air and the water sample. The method provided by the invention meets the requirement of immersed tunnel construction, is a sampling method for one-step sampling water sample at different depths and at assigned positions based on the fact that little disturbance to the water body is guaranteed, and is a method for measuring the water sample unit weight; the system provides data direct at requirements of different working conditions to support the calculation and control of buoyancy in the construction, improves the construction efficiency, and reduces the engineering risk; and the system and the device are simple, fast and convenient in operation, and are high in accuracy.

Description

technical field [0001] The invention relates to the field of construction of immersed tunnel pipe sections, in particular to a method for sampling water bodies and detecting bulk density during floating, sinking, and sinking of immersed tunnel pipe sections, and a water sampling device. Background technique [0002] At present, in the process of floating and sinking the immersed tube section, the buoyancy control is realized by adjusting the water storage capacity in the water tank. Since water bulk density changes with hydrogeological conditions, water temperature, water depth, and tides, changes in water bulk density will lead to inaccurate control of the water volume in the water tank during construction, thereby affecting the anti-floating stability of the pipe section, increasing construction risks, and affecting water In some cases, the detection and monitoring of bulk density will be directly related to the progress and quality of immersed tube tunnel engineering cons...

AI Technical Summary

Problems solved by technology

Since water bulk density changes with hydrogeological conditions, water temperature, water depth, and tides, changes in water bulk density will lead to inaccurate control of the water volume in the water tank during construction, thereby affecting the anti-floating stability of the pipe section, increasing construction risks, and affecting water In some cases, the detection and monitoring of bulk density will directly affect the progress and quality of immersed tunnel engineering construction

In the past engineering construction, the change of water bulk density was often ignored, which led to the increase of engineering risk

In terms of sampling and detection methods, the method of underwater sampling by divers is often used. This method is not easy to operate and will cause excessive disturbance to the water body, thereby affecting the accuracy of sampling.

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