Preparation method of pipe jacking structure and surrounding rock soil mass model forming device

Abstract

The invention discloses a preparation method of a pipe jacking structure and surrounding rock soil mass model forming device, which comprises a test box body and a concrete column arranged in the test box body and prepared by a concrete column mold. An accommodating space is arranged in the test box body, model soil is filled in the accommodating space, a hollow cylindrical grouting gap is reserved between the model soil and the concrete column, a soil mass compaction system compacts model soil step by step in a layered mode through a pressing head and a backing ring with the bottom arranged in the accommodating space, a surrounding rock soil mass model is prepared, a core-removing mold pull rod in the core-removing mold system is arranged at a center opening of a pressing head horizontal component, a connecting component is arranged at the bottom of the pull rod, and when the connecting component moves, an inner mold is driven to vertically move upwards to remove the inner mold and serves as a basic part of a follow-up pipe jacking model device. The rock surrounding soil mass model preparation device for the pipe jacking model test is provided for the first time, meanwhile, other systems are arranged in a matched mode, the applicability is good, and the reliability of the pipe jacking model test result can be improved.

Description

technical field [0001] The invention relates to the test field of underground geotechnical engineering, in particular to a method for preparing a pipe jacking structure and a surrounding rock soil model forming device with a grouting gap reserved. Background technique [0002] The pipe jacking method is a kind of underground excavation construction method used when tunnels or underground pipelines cross various obstacles such as railways, roads, rivers or buildings. During construction, set the support in the working well and install the main jack. The tool pipe is placed behind the pipe jacking machine. Through the thrust of the main jack, while the pipe jacking machine is digging into the soil layer, the next section after section of the pipeline is also After being jacked into the excavated soil layer, the excavated muck is discharged by equipment such as muck pumps or screw conveyors until the machine head is pushed out of the receiving well, and the jacking process is s...

AI Technical Summary

Problems solved by technology

This patented technology can level the soil on the top of the test box through the leveling mechanism, and then compact it through the compacting mechanism to obtain a well-uniform surrounding rock model, but there are still the following problems: 1) The physical model test still uses one The uniformity of the obtained soil still needs to be improved. This patent uses layered compaction of the soil to control the material density and density of the surrounding rock soil model. dry density, and greatly improved the uniformity of soil materials; 2) The surrounding rock model prepared by the invention patent can not be well used in the tunnel model test, and the applicability is small. There are matching devices, which can be directly used for model tests of pipe jacking tunnels

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