Guangdong University of Technology

China Construction Third Engineering Bureau Group South China Co., Ltd.

Bin Chen

Xin Chen

Han Wang

Xindu Chen

Weimin Wen

Xiuyi Wang

Xiaohai Wei

Caihui Wu

Chaolong Fan

Hailiang Peng

Zhixiong Wu

Xiaolu Deng

A top-down construction method for a multi-storey basement with a full steel structure is provided, including: S, constructing a diaphragm wall permanent structure; S. conducting an open excavation, then constructing a first layer structural beam and slab; S. conducting an underground excavation on an underground second layer earthwork, then constructing structural beam and slab and vertical shear wall on underground first layer; S. excavating earthworks from an underground third layer to an underground N−1 layer, and constructing structural beams and slabs and vertical shear walls; S. conducting the underground excavation on an underground N layer earthwork, and constructing a two-span structural steel beam; S. conducting the underground excavation on earthworks of bottom plate layer, constructing remaining structural beams and slabs and vertical shear wall; S. conducting the underground excavation on earthworks of bearing platform and water collection well; S. constructing earth intakes of the podium and the basement.

Top-down construction method for multi-storey basement with full steel structure

A method of assisted mounting and error compensation for absolute grating ruler comprises: (1) when mounting a CMOS sensor and a grating ruler body, the CMOS sensor reads an upper and a lower sample windows, and due to an angle existing between the grating ruler body and the CMOS sensor, a difference exists between the numbers of the upper and lower sample windows, and by continually adjusting the grating ruler body or the CMOS sensor, the code reading difference minimized so that the angle is zeroed; (2) when mounting the grating ruler body and a mechanic housing, it is moved by a fixed displacement in a motion direction, and a grating encoding reading is recorded and an error compensating amount is obtained which serves as error compensation value in an actual motion to correct a cumulative error introduced by the angle between the grating ruler body and the motion direction.

Method of assisted mounting and error compensation for absolute grating ruler

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Guangzhou, China

Bin Chen