Description

The tunnel lining concrete is a structure connected to each span, and deformation occurs depending on the surrounding conditions.

In particular, the joint part for application is where the deformation is caused and the displacement occurs in each direction (radius, tangential and axial direction).

▣ Applications

1. To install at the crown, shoulder area and side wallin the joint part for application of tunnel lining and measure the length displacement and angular displacement. (Possible for maintenance and measurement)
2. Convergence measurement of the full-face cross-section in underground structures of adjacent construction sections. (Measurement during construction)

Composition & Characteristics

▣ Components

1. Sensor for length displacement (1-way) and angular displacement (2-way)
2. Mounting bracket
3. Anchor plate & bolts

▣ Features

1. The crack width of the tunnel joint can be measured as length displacement.
2. Deformation can be measured as angular displacement in both radial and tangential directions.

Specification

Model Name	SJ-9200
Sensor applied	Angular displacement: MEMS sensor / Length displacement: Electric sensor
Measurement range	Angular displacement: ±15° / Length displacement: 0 ~ 10 mm
Resolution	Angular displacement: 5 arc seconds / Length displacement: 0.001 mm
Accuracy	±0.1% FSR
Linear tolerance	±0.5% FSR
Working temperature	-40°C ~ 80°C
Dimension	L = 300 mm, D(Ø) = 30 mm (customizing by depth/length available)
Material	Aluminum

Reference

Subject	General type (Linear manual)	Free movable type (Ball bearing)
Installation method	Fixing pin drill & insert Sensor fixing Manual measurement	Special fixing pin drill & insert Sensor fixing Connection to automation system
Advantage	Different references applied at the field	<Sensor> Accurate measurement when deformation of structure occurs. Easy to install because of the One-Line system for 3-ways. Installation time can be saved much more than other systems. <Accessory> Easy to install due to the special fixing pin adopted. Good applicability for the structure surface bump section.
Disadvantage	Manual measurement (Accessibility is difficult). Functional limitation in detection of the displacement when deformation of structure occurs.	Field references are not much.
Economic	Easy to install and the price is low.	Good (Installation time and manpower is minimized) Sensor price is the same as the existing type.