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

A technology of immersed tube tunnel and water collector, which is applied to sampling devices and other directions, can solve the problems of affecting the anti-floating stability of pipe sections, inaccurate control of water volume in water tanks, affecting sampling accuracy, etc., so as to reduce water disturbance and ensure reliable detection results. , Sampling accurate and reliable effect

Active Publication Date: 2012-10-03
SHANGHAI JIAO TONG UNIV UNDERWATER ENG INST CO LTD +2
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  • Application Information

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.

Method used

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

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Embodiment Construction

[0039] existfigure 1 In the process, first determine the sampling location and depth requirements according to the specific situation, then install the sampler according to the sampling requirements and take water samples, after sampling, use the electronic density analysis balance in the laboratory to measure the bulk density of the water samples, and compile the test report, Finally, submit the report to the relevant units to provide guidance for the corresponding construction, design and other departments.

[0040] figure 2 The horizontal card cover type water collector shown in is suitable for taking water samples only at a certain depth at the sampling point. When collecting water, hang the card cover 2 on the hook 6 on the piston 4 through the hoop on the traction line 3 (preferably nylon wire), and now the card cover 2 is opened, and the bottle body 1 can collect water. Sink the bottle body 1 to the specified depth by the hydrological rope 5, lower the hanging hammer ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/10
Inventor 沈永芳于立群林金雄张兴业奚笑舟隋洪瑞孟庆祥吴刚朱世柱
Owner SHANGHAI JIAO TONG UNIV UNDERWATER ENG INST CO LTD
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