A method for testing the force of bolts connecting shield tunnel segments

Abstract

The invention relates to a method for testing the force of bolts connecting a shield tunnel segment, comprising the following steps: 1) slotting (6) axially on the bolt (3); 2) pre-embedding a strain sensor in the slot (6) Components (4) and wires (5) connecting the strain sensor elements (4); 3) sealing the strain sensor elements (4) and wires (5) in the groove (6) with a sealant (10), and placing the wires ( 5) lead out from the head of the bolt facing outward; 4) install the bolt (3) between two adjacent segments of the shield tunnel, and fasten the connection, and connect the wire (5) to the testing instrument. This method realizes the stress test of the bolt by drawing grooves on the bolt to encapsulate the wire and the sensor. The components are not affected by the fastening of the bolts, the survival rate of the components is high, and the test effect is good. technical problems.

Description

technical field [0001] The present invention relates to a bolt force test method, in particular to a shield tunnel segment connection bolt force test method, which is suitable for the mechanical state test of the shield tunnel segment connection bolts, Background technique [0002] In recent years, domestic shield tunnels have developed rapidly, including subways, highways, municipalities, railways, water transmission, gas transmission and other industries. The domestic industry has also invested a lot of money in the test and theoretical research of shield tunnels, and carried out a large number of scientific research projects, such as in the mechanical testing and monitoring of shield tunnels, and has also achieved remarkable results. But at present, in terms of state monitoring of shield tunnels, it is only limited to the stress of steel and concrete and the test of tunnel convergence displacement. For the bolts that play a key role in the structural system of shield tunn...

AI Technical Summary

Problems solved by technology

However, during the bolt fastening process, the surface of the bolt needs to be in contact with the inner wall of the concrete screw hole, so it is difficult to ensure the survival of the strain gauge, and the wires of the strain gauge cannot be led out normally.

This is especially true for the oblique bolts that are widely used at present, because the screw and nut of the oblique bolt are installed as a whole, and when the screw is fastened, its surface will have a large friction with the inner wall of the concrete screw hole, which cannot guarantee the sensor element. survival

Images