Top part horizontal displacement monitoring method for foundation pit support device

Abstract

The invention relates to a top part horizontal displacement monitoring method for a foundation pit support device. A total station is erected on the ground on the outer side of an end of a crown beamcomparatively far away from a pit excavation face and exactly facing the crown beam. The total station is adjusted and a sight point of an eyepiece of the total station is set on a concrete face on the top end of the crown beam. Initial observation is performed on the total station and reference points of the total station are determined; points are set in sequence from one end to the other end ofthe crown beam and are then connected together so as to form a long straight line on the surface of the crown beam. Measurement is started from one end point of the long straight line to the other end point of the long straight line and a point at the long straight line having comparatively large displacement is found. A measurement result is drawn in to a grid form and a displacement curve graphof the top of the crown beam is generated. The invention can reflect the horizontal displacement level of the crown beam directly. The method is simple and is time saving and labor saving.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a method for monitoring the horizontal displacement of the top of a foundation pit enclosure protection device. Background technique [0002] In foundation pit engineering, especially deep foundation pit engineering, it is necessary to monitor the enclosure structure of the foundation pit during the excavation process, so as to control its deformation. Among them, the horizontal displacement of the top of the enclosure structure is an important monitoring index, which can directly reflect the impact of excavation construction on the enclosure. [0003] The monitoring method for the horizontal displacement of the top of the existing containment device, such as figure 1 As shown, several monitoring points 13 are usually set on the top of the crown beam 11 to be monitored (wherein the crown beam 11 is the concrete capping beam at the top of the enclosure device 12) along ...

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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to overcome the complex method of monitoring the horizontal position of the foundation pit enclosure structure in the prior art, which leads to time-consuming and labor-intensive problems, so as to provide a simple, time-saving and labor-saving foundation pit enclosure device The method of top horizontal displacement monitoring

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