Method of constructing shallow tunnel underground passage variable-cross section cross mid-partition wall

Abstract

The invention provides a method of constructing a shallow tunnel underground passage variable-cross section cross mid-partition wall. The method is characterized by comprising the following steps of 1) dividing a first cross section of a passage into a plurality of guide holes along a tunneling direction; 2) finishing primary supporting for the first cross section to the third cross section by the CRD method; 3) dividing a fourth cross section into a plurality of guide holes; 4) respectively replacing the supporting of each temporary inverted arch surface of the upper layer, the middle layer and the lower layer among the second cross section to the fourth cross section with new temporary inverted arches; 5) paving and firmly welding longitudinal reinforcing steel bars on the third new temporary inverted arch surface according to requirements; 6) finishing underground passage primary supporting for the fourth cross section to the fifth cross section by the CRD method by taking the two new temporary inverted arch surfaces of the middle layer and the lower layer as construction walking passages; and 7) detaching the temporary inverted arch supports section by section, and meanwhile lining the underground passage for the second time section by section, so that the main body structure is formed. Due to the fact that the procedure conversion of variable-cross section passage support change is adopted, the CRD method can be used for continuously operation according to the requirements all the way, the cost can be saved, and the efficiency is improved.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for a variable cross-section intersecting partition wall of a shallow-buried underground excavation underground passage. Background technique [0002] With the development of social economy and the expansion and adjustment of urban road network, the application of urban underground sidewalks or tunnels is becoming more and more extensive. Underground sidewalks are likely to gradually replace pedestrian bridges and become the main facilities for crossing streets in urban areas. At present, underground building construction mainly includes: shield tunneling method, pipe jacking method, open cut method, shallow buried buried excavation method, etc. The shallow buried buried excavated method is a new method developed in the past ten years. Compared with other construction methods, the shallow burial and underground excavation method has the advantages of no ...

AI Technical Summary

Problems solved by technology

However, due to the large number of temporary supports, the upper process has more restrictions on the next process, which makes the process conversion of variable cross-section passages dangerous and difficult, which is not conducive to on-site construction and execution, or to complete the entire primary support and secondary support of the same cross-section passage. After the lining (that is, the main structure of the channel with the same cross-section is completed), the channel part with variable cross-section is constructed, which increases the complexity of the process, is not conducive to cross-flow operation and product protection, increases the difficulty and cost of slag transfer and prolongs the construction period Time, labor and material consumed

Images