sensors

Ground Settlement Marker

Sub-surface reference point for monitoring vertical settlement and heave in soil, embankments, and soft ground.

Model No
G92-700GS
Riser Rod Material
Stainless Steel / Galvanized Steel
Rod Diameter
16mm or 20mm

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Overview

Sub-surface reference point for monitoring vertical settlement and heave in soil, embankments, and soft ground.

The Geolook G92-700GS Ground Settlement Marker is designed to measure the vertical displacement of soil or fill material. While building markers are used for rigid structures, ground markers are essential for tracking the stability of embankments, pre-load fills, and areas prone to subsidence. The system consists of a stainless steel or galvanized steel riser rod connected to a base plate or earth anchor buried at a specific depth. The top of the rod is protected by a heavy-duty cover or manhole, providing a stable reference point for surveyors to perform high-precision leveling throughout the construction and post-construction phases.

Read Detailed Description

Benefits & Features

  • Deep-anchor design isolates measurement from surface soil heave
  • Corrosion-resistant steel riser rods
  • Protective outer sleeve to prevent skin friction from affecting results
  • Hemispherical top cap for repeatable survey leveling
  • Available with various base plate sizes for different soil types
  • Rugged protective cover for installation in traffic or construction zones
  • Can be extended to various depths using modular rod sections

Detailed Description

Deep Anchor vs. Surface Pin

A simple pin pushed into the surface of the ground can move due to rain, frost heave, or local foot traffic. This is not 'settlement.' The G92-700GS uses a base plate buried at a specific depth.

The riser rod is protected by an outer 'sleeve' pipe. This sleeve ensures that the soil near the surface can move up or down without 'dragging' the rod with it. This allows the surveyor to measure the movement of the stable soil layer where the base plate is located.

Installation in Embankments

During the construction of a highway or dam embankment, markers are installed in stages. As the fill height increases, additional rod and sleeve sections are added. This allows for a continuous record of settlement from the very start of construction through to the final paving.

Survey Repeatability

The top of the riser rod features a precision-machined hemispherical cap. This provides a single 'high point' for a leveling staff. By eliminating the ambiguity of where to place the staff, the G92-700GS ensures that different survey teams can achieve identical results, leading to a clean, noise-free settlement curve.

Protection and Access

In active construction zones, markers are often run over by machinery. We provide the G92-700GS with a heavy-duty protective housing (manhole type) that is installed flush with the ground. This protects the precision rod from damage while allowing easy access for monitoring rounds.

Available Models

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Specifications

Model No
G92-700GS
Riser Rod Material
Stainless Steel / Galvanized Steel
Rod Diameter
16mm or 20mm
Base Plate Size
300mm x 300mm (Standard)
Outer Sleeve
HDPE or PVC friction-reduction pipe
Measurement Accuracy
±1mm (survey dependent)
Protection
Cast-iron or High-impact Plastic cover