Structure extending open tunnel for existing rapid transit railway tunnel

Abstract

The invention discloses a structure extending an open tunnel for an existing rapid transit railway tunnel, which aims to improve safety and construction efficiency and effectively avoid interference on railway operation. The structure extending the open tunnel is in butt joint outside the portal of the existing tunnel, which comprises two lateral foundation structures, arched formed steel frames (20) fixed on the two lateral foundation structures, reinforced concrete fiberboards fixed on concave surfaces of the arched formed steel frames (20), and reinforced concrete arch parts (40) poured along the formed steel frames (20). In the structure, the reinforced concrete fiberboards closing the concave surfaces of the arched formed steel frames can be used as an inner mold for pouring construction of the reinforced concrete arch parts of the open tunnel, and can also be used as a part of the open tunnel structure so as to solve the problems of erecting the inner mold before concrete construction and detaching the inner mold after construction is completed, so that the structure has short construction period and good safety; and the prefabricated arched formed steel frames can greatly improve the construction process by hoisting on the premise of ensuring the safety.

Description

technical field [0001] The invention relates to high-speed railways, in particular to an open tunnel structure of an existing high-speed railway tunnel. Background technique [0002] In the operation of existing tunnels, there are usually two reasons why long tunnels need to be extended. The rock formations exposed on the mountain are split and peeled off, resulting in dangerous rockfalls, which endanger driving safety; near the entrance of existing tunnels, new roads, railways or other building. Open tunnels or shed tunnels are generally used for tunnel extensions. Open tunnels are often preferred because the arches are single-centered or triple-centered, have better stress conditions, and can withstand large impact loads. [0003] In the electrified railway, the electric energy output by the traction substation is sent to the contact line of the catenary through the power supply line, and provided to the electric locomotive. The catenary of the existing tunnel is compose...

AI Technical Summary

Problems solved by technology

The capacity of the busy main line is very tight, passenger and freight trains run mixedly, and the transportation fluctuates greatly, resulting in periodic, seasonal, and flow imbalances, and the phenomenon of insufficient cashing of comprehensive skylight points such as "eat points" or "no points" occurs from time to time ;During critical periods such as spring and summer transportation, flood control, etc., due to the large number of extra passengers or the impact of water damage, the normal transportation is greatly disturbed, resulting in a decline in the rate of delivery of skylights

[0008] (2) Insufficient comprehensive utilization of construction skylight points

The construction plan, construction organization, and safety measures of some units were not implemented; the equipment management unit did not strictly control the construction safety agreement, safety supervision, and construction quality, resulting in multiple types of work in the integrated skylight site, and there was no main unit for construction operations in the large corps operations; There is a lack of overall planning and coordination among units, operators, and operating machines; some construction units do small jobs, but they need to be larger, the work volume in the site is not full, the sales point is not timely, and the waste of skylight resources is more common

[0009] (3) It is difficult to organize skylights for large-scale technical operations

[0030] Since the construction time needs to occupy part of the "skylight" time, and the speed limit of the passing trains is 25km / h, this scheme has the disadvantages of a long construction period, difficult construction organization, and great interference to the operation.

Images