A telescopic arm type multi-point displacement gauge anchor head for soft ground

Abstract

The invention relates to a telescopic arm type multi-point displacement meter anchor head applied to a soft soil stratum. The anchor head comprises a medium shaft barrel, an outer barrel which sleeves the medium shaft barrel, a first-grade force transmission rod which is connected to the bottom end of the outer barrel through a screw knob, an outer ring which sleeves the outer barrel, a bottom plate which is connected to the low end of the medium shaft barrel, a second-grade force transmission force which is connected with the outer ring through the screw knob, and a telescopic arm barrel mechanism which is respectively connected with the first-grade force transmission rod, the second-grade force transmission rod and the bottom plate through the screw knobs; the first-grade force transmission rod, the second-grade force transmission rod and the telescopic arm barrel mechanism are respectively vertically rotated about the screw knobs; the medium shaft barrel, the telescopic arm barrel mechanism and the bottom plate are all of a hollow structures. Compared with the prior art, the anchor head has the advantages that the settlement amount of different soil stratums in a soft soil area can be reliably and quickly measured, and the data for monitoring the settlement of the stratum are provided for the foundation pit engineering and underground engineering.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering detection, in particular to an anchor head of a telescopic arm type multi-point displacement meter for soft soil strata. Background technique [0002] In order to obtain the information of foundation settlement in the survey stage of foundation pit engineering and underground engineering in soft soil areas and during the construction and excavation process, it is necessary to set up multi-point displacement meters in the borehole for monitoring. At present, the existing drilling multi-point displacement measuring point fixing devices mainly include blade cutting type, grouting type, shrapnel type, hydraulic support type and inverted wedge type. The disturbance is large, which destroys the original weak soil structure in the soft soil area, which often makes it difficult to measure the ideal stratum settlement data. Excessive arrangement of observation points also hinders the cons...

AI Technical Summary

Problems solved by technology

At present, the existing multi-point displacement measuring point fixing devices for drilling mainly include knife-cutting type, grouting type, shrapnel type, hydraulic support type and inverted wedge type, etc. The large disturbance destroys the original soft soil structure in the soft soil area, which often makes it difficult to measure the ideal ground settlement data. Therefore, the method of measuring a ground settlement with one hole is often used for measurement, which greatly increases the project cost. At the same time Too many observation points are arranged, which also hinders the excavation and support construction process, and also causes great difficulties in the protection of observation points

In addition, the anchor head of the existing multi-point displacement gauge has a large self-weight, which is often used in soft soil areas, which often affects the measurement results due to the effect of self-weight

[0003] Chinese patent CN 202361914U discloses a retrievable multi-point displacement meter. The device includes an orifice reading device, an anchoring device in the hole and a manual joystick. The anchoring method adopts a steel sheet opening type. For soft soil areas, this method cannot The anchoring force is effectively applied, and because the anchor head is separated from the control rod, it is easy to disturb the soil of the hole wall when the control rod is installed and removed, so it is difficult to obtain ideal data of stratum settlement in soft soil areas

[0004] Chinese patent CN 203393695U discloses a horizontal multi-point displacement meter device for geotechnical engineering safety monitoring. The device includes an exhaust pipe, a distal anchor head and a proximal anchor head. It is suitable for monitoring rock mass deformation, but not applicable It is used for the anchoring of soft ground and the measurement of ground settlement, and its grouting pipes and exhaust pipes have no telescopic function, nor are they symmetrical or evenly distributed

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