Cccc First Harbor Engineering Co., Ltd.

Tianjin Jyjc Technology Co., Ltd.

Chao Gao

Yiyong Li

Zengjun Li

Naishou Zhang

Peng Wang

Yang Yang

Yongfang He

Quan Wan

Lingda Gao

Bingchuan Guo

Xianzhi Lang

Hugejile Liang

Jingtuo Shen

The present invention discloses a negative pressure wave monitoring based leak detection method of a multipath pipeline network, including: analyzing a propagation process of a negative pressure wave in a single straight pipeline to obtain a calculated result of a sound velocity in a thin-walled pipe marking the pressure sensors at known disposing positions on a pipeline network map; linearly interpolating position coordinates of key nodes in the pipeline network to extend pipeline network information; resolving the time that a negative pressure wave signal generated by a leak propagates to each disposed RTUs to form a data column; and simulating a leak situation, detecting a pipeline pressure waveform by using the RTUs in a current network, and determining a point corresponding to the data column closest to a measured propagation time delay in the time delay standard library as a leak point, and outputting the position of the leak point.

Negative pressure wave monitoring based leak detection method of multipath pipeline network

A foundation treatment method for piling a foundation structure by penetrating a hardpan layer, i.e., a Deep Slurry Mixing method, comprising following steps: disturbing, by a mechanical device, a location where the foundation structure is to be piled, so that the mechanical device penetrates the hardpan layer of a natural foundation; then injecting clay slurry into the hardpan layer of the natural foundation by a pumping device, an improved foundation is formed after mixing; and piling the foundation structure. The method can change soil property of the original natural foundation, break the hardpan layer, reduce piling resistance of the steel plate cylinder or similar foundation structure, reduce uneven force during the piling process and improve driveability.

Foundation treatment method for piling foundation structure by penetrating hardpan layer

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Tianjin, China

Chao Gao