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

Abstract

The invention relates to a spring-arm-type multi-point displacement meter anchor head for a soft soil ground layer. The spring-arm-type multi-point displacement meter anchor head comprises a center axis barrel, an outer barrel, dowel bars, a base plate and a pull rope, wherein limiting components are arranged on the outer wall of the center axis barrel; the bottom end of the center axis barrel is connected with the center of the base plate; the outer barrel sleeves the center axis barrel; the top end of the dowel bar is connected with the bottom end of the outer barrel through a bolt; the spring-arm-type multi-point displacement meter anchor head further comprises spring arm barrel mechanisms with a switch component arranged at the top end; the top end of the spring arm barrel mechanism is connected with the bottom end of the dowel bar through a bolt; the bottom end of the spring arm barrel mechanism is connected with the base plate through a bolt; one end of the pull rope is connected with the switch component; the other end of the pull rope is fixed at the top end of the center axis barrel; the center axis barrel, the base plate and the spring arm barrel mechanism adopt hollow structures; the anchor head is inserted into the soft soil ground layer when being at closed state; when the anchor head is at unfolded state, the spring arm barrel mechanism is at horizontal state, the switch component is switched on, and the top end of the spring arm barrel mechanism stretches and is inserted into surrounding soil. Compared with the prior art, the spring-arm-type multi-point displacement meter anchor head has the advantages that the settling amount of different soil layers in a soft soil area can be reliably and conveniently measured, and ground settlement monitor data can be provided for foundation pit engineering and underground engineering.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering detection, in particular to a spring-arm type multi-point displacement meter anchor head used for soft soil formations. Background technique [0002] In order to obtain the foundation settlement information of foundation pit engineering and underground engineering in soft soil areas during the survey stage and construction excavation process, it is necessary to set up multi-point displacement meters in the borehole for monitoring. 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 body disturbance destroys the original soft soil structure in the soft soil area, which often makes it difficult to measure the ideal stratum settlement data. Therefore, the method of measuring a stratum settlement with one hole is ofte...

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 body disturbance destroys the original soft soil structure in the soft soil area, which often makes it difficult to measure the ideal stratum settlement data. Therefore, the method of measuring a stratum 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 has a great impact on the measurement results when applied in soft soil areas

[0003] Chinese patent CN202361914U 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 is not effective. The anchoring force is applied, and because the anchor head is separated from the control rod, it is easy to disturb the hole wall soil 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 CN203393695U 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. Anchorage of soft ground and 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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