Loading frame for tunnel lining model test

Abstract

The invention provides a loading frame for a tunnel lining model test, which belongs to the technical field of civil engineering. An existing loading frame has the problems that only a longitudinal connecting beam is designed between the bottoms of opposite diagonal bracings, the rigidity of the frame is affected by large deformation generated in a test, and both a step and a simple operation plate are temporarily set up and have no safety measures such as handrails and the like. The section of the loading frame is of a splayed closed frame structure, four vertical columns 2 are arranged at the center of the frame structure and connected by longitudinal beams pairwise, I-steel beams are erected on the longitudinal beam, a lifting running device 3 is arranged on the beams, stepped supports 1 are arranged on two sides of each vertical column 2, antislip steps 7 with safety handrails are arranged on the stepped supports 1, an operation tabletop 5 is transversely erected between the two stepped supports 1, and vertical force-bearing assembly plates 4 are arranged at joints of the vertical columns 2 and upper tabletops of the stepped supports 1. The loading frame is mainly used for the tunnel lining model test.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a loading frame used for model test research of vertical tunnel lining. Background technique [0002] The loading frame is the main force-bearing structure in the tunnel lining model test research, and is also used for the installation and positioning of other equipment in this test study, and is the key structure for obtaining reliable test data. [0003] The existing loading frame is a symmetrical structure, which is composed of four triangular diagonal braces, two longitudinal connecting beams, and four transverse connecting beams, and the cross section is a triangular opening structure. The triangular brace is assembled and welded by three channel steels to form a right-angled triangle bracket whose base and hypotenuse form 60 degrees, and two reinforcing ribs are welded parallel to the base. The triangular braces on the same side are connected by two t...

AI Technical Summary

Problems solved by technology

[0005] The problem of using the existing loading frame is: only the longitudinal connecting beam is designed at the bottom between the opposite triangular braces, and the large deformation produced by the test affects the rigidity of the frame; the surrounding rock, the loading pressure plate, the bearing beam, When operating sand bags, etc., they must enter from the cement steps behind the container, or set up a simple ladder welded with round steel on the same side of the triangular brace, and lay a simple operation panel for the staff on the horizontal reinforcement at the top of the triangular brace , so as to facilitate the staff to climb up the operation panel from the simple steps of the inclined braces to carry out related operations. The steps and the simple operation panel are temporarily built without safety measures such as handrails, and there are potential safety hazards; heavy objects, pressure plates, bearings in the container The hoisting of force beams, sand bags, etc. is carried out with a simple bracket fixed on the top of the four triangular diagonal braces, which has low rigidity and is easy to deform, posing safety hazards

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