Method for monitoring axial force of foundation pit steel support by means of laser distance measuring sensor

Abstract

The invention relates to a method for monitoring the axial force of a foundation pit steel support by means of a laser distance measuring sensor. The method comprises the following steps that (1), after the foundation pit steel support is erected and before pre-tightening force is applied, a fixing device is welded to a foundation pit steel support end steel base plate on one side, and a reflector is arranged at the corresponding position of a foundation pit steel support steel base plate on the other side; (2), the laser distance measuring sensor and the fixing device are connected, laser points of the laser distance measuring sensor irradiate the center of the reflector to be subjected to point measurement, and then readings are read; and (3), according to the specified measurement frequency, the above measurement steps are repeated, the readings are recorded, the difference between the readings and the measured value of the first time is steel support deformation at various monitoring time points, and the axial force of the steel support can be calculated based on the Hooke's law. According to the method for monitoring the axial force of the foundation pit steel support, the structure is simple, mounting is convenient, operation is fast, and the precision requirement can be met; and the manufacturing cost is low, and application and popularization are easy.

Description

technical field [0001] The invention relates to a monitoring method for monitoring the axial force of foundation pit steel support by using a laser ranging sensor, which is mainly used for monitoring the axial force of foundation pit engineering steel support. Background technique [0002] In the construction of foundation pit engineering, steel support is widely used because of its advantages of easy installation and removal, and low material consumption. The support axial force is the main evaluation index for the safety of foundation pit engineering, so it is the Main monitoring items. [0003] There are two main methods for monitoring the axial force of the steel support structure of the existing foundation pit engineering: one is to install strain gauges on the steel support, but the installation is more dangerous, and the installation requirements are high. Generally, three or four are installed on one steel support. Strain gauges are expensive, and there are many fac...

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Problems solved by technology

[0003] There are two main methods for monitoring the axial force of the steel support structure of the existing foundation pit engineering: one is to install strain gauges on the steel support, but the installation is more dangerous, and the installation requirements are high. Generally, three or four are installed on one steel support. Strain gauges are expensive, and there are many factors affecting the monitoring accuracy, so the accuracy is not easy to guarantee; the other is to install the axial force gauge in series at the end of the steel support, which is complicated to install, especially the axial force gauge and the steel support are installed in series , the construction unit needs to cooperate to configure the steel support to an appropriate length, and it cannot be implemented if the steel support has been configured or has been constructed

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