Construction method of special-shaped partition wall method in large-section tunnel with small net distance

Abstract

The invention provides a special-shaped center-diaphragm construction method for a small-spacing large-section tunnel, which is used for tunnel excavation. The method comprises the following steps: 1)performing excavation on a small fracture surface tunnel at the initial section of a second tunnel; 2) dismantling an excavated section of the large-section tunnel into a standard section and a remaining section, setting a first temporary support at the dismantled interface in order to form a special-shaped center-diaphragm execution section; 3) according to the first pre-set height, excavating athird section of the second tunnel and the initial section of the first tunnel, sectionally grouting rock and strengthening side surfaces where the third section of the second tunnel and the initialsection of the first tunnel are connected with connected tunnels in order to form rock columns; 4) orderly performing tunnel lining operation on the initial section of the second tunnel, the second section of the second tunnel and the third section of the second tunnel and synchronously excavating the second section of the first tunnel; 5) orderly performing tunnel lining operation on the initialsection of the first tunnel and the second section of the first tunnel while excavating the connected tunnels.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method of a special-shaped partition wall method for a tunnel with a small clear distance and a large cross-section. Background technique [0002] With the continuous expansion of urban subways, the number of tunnels with small clear distances has increased year by year, and due to the limitations of lines and buried depths, the sections of adjacent tunnels are getting larger and closer, and the grade of surrounding rock is getting worse , bringing great construction difficulty and safety risks to the site construction. Contents of the invention [0003] The object of the present invention is to provide a construction method of the special-shaped partition wall method for small clear distance and large cross-section tunnel, which has simple process principle, easy technology mastering and convenient organization and management. [0004] The present i...

AI Technical Summary

Problems solved by technology

[0002] With the continuous expansion of urban subways, the number of tunnels with small clear distances has increased year by year, and due to the limitations of lines and buried depths, the sections of adjacent tunnels are getting larger and closer, and the grade of surrounding rock is getting worse , bringing great construction difficulty and safety risks to the site construction

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