Shield tunnel duct piece both-way prestress strengthening device and construction method

Abstract

The invention discloses a shield tunnel duct piece both-way prestress strengthening device and a construction method. The device comprises a plurality of sets of combined duct pieces arranged in the circular direction, and at least one ring of special duct piece is arranged in the middle of each combined duct piece. A plurality of sets of ordinary duct pieces coaxial with the combined duct pieces are arranged between the adjacent combined duct pieces. A stress ring is embedded in each ring of special duct piece. Each stress ring comprises at least two sections of half stress rings. The two stress rings, the same in position, on every two adjacent combined duct pieces are connected through a fastening structure. The shield tunnel duct piece both-way prestress strengthening device has the beneficial effects that the stress rings are arranged in the circular direction of the duct pieces, the duct pieces are supported through the stress rings in the circular direction, and the strengthening of the duct pieces in the circular direction is achieved; in the longitudinal direction of the duct pieces, the duct pieces are tightly extruded through steel strands, and uneven longitudinal deformation of the tunnel duct pieces is limited; longitudinal and circular-direction strengthening is carried out on the duct pieces at the same time, a simply supported beam effect is formed through the duct pieces within a certain length range, the uneven settlement or uneven load resisting capability of the duct pieces is improved, and the strength of the shield tunnel duct pieces is improved.

Description

technical field [0001] The invention relates to the construction of a shield tunnel segment, relates to rail transit and tunnel technologies, belongs to the field of engineering technology, and specifically relates to a shield tunnel segment bidirectional prestress reinforcement device and a construction method. Background technique [0002] Shield construction has been more and more applied to the construction of urban subways and tunnels crossing mountains or rivers due to its fast excavation speed, less impact on the environment, high automation, and small disturbance to the ground. However, shield tunnel segments The width will be limited in size, resulting in the assembly of a large number of segments within a certain depth of the tunnel. During the later operation of the shield tunnel, the vibration load caused by the operation of the vehicle and the uneven load caused by the bad ground will lead to Uneven settlement or even fracture occurs between the tunnel segments ...

AI Technical Summary

Problems solved by technology

Patent 201410311274.2 discloses a reinforcement method for setting support inside a shield tunnel. In this application, a steel ring is set and the steel ring is supported by I-shaped steel to achieve circumferential and longitudinal rigidity and strength. However, due to the support of I-shaped steel It is installed inside the segment, resulting in a complex internal structure. At the same time, in order to improve the support strength, it requires a large number of such support devices

Images