Prestressed modulus type duct piece for whole-ring reinforcing in tunnel and construction method

Abstract

The invention discloses a prestressed modulus type duct piece for whole-ring reinforcing in a tunnel and a construction method. The prestressed modulus type duct piece comprises an arc duct piece body, multiple parallel longitudinal ribs are arranged on the inner surface of the arc duct piece body, the adjacent longitudinal ribs are connected through transverse ribs, pre-pressure applying device installation grooves are formed in the top face and the bottom face of the duct piece body, and the duct piece body is provided with bolt holes and grouting holes. The prestressed modulus type duct piece mainly has the advantages that it is avoided that the building line in the tunnel is reduced to the great extent; the structure has pre-pressure and initiatively bears outer loads, the stress state of an original duct piece is changed, and deformation is reduced; influence on the structural reinforcing effect from insufficient connection intensity of the original duct piece and a reinforcing duct piece is avoided; steel bars do not need to be embedded or bolts do not need to be anchored, and damage to the original duct piece is avoided; the construction process is simple and rapid, and funds are saved.

Description

technical field [0001] The invention relates to a novel prestressed modulus type segment structure and a construction method for reinforcement in a tunnel, belonging to the technical field of construction engineering. Background technique [0002] With the rapid development of the national economy, highways, railways, and urban transportation have also maintained rapid development. At the same time, the proportion of tunnel structures to the total traffic mileage is also increasing. During normal operation, the lining of the tunnel structure and the segments of the subway structure have been damaged and deformed to varying degrees, seriously affecting the safety of transportation. [0003] At present, for the damage and deformation of the inner lining of the tunnel and the segment in the subway, the main treatment measures are to use anchored shotcrete, secondary segments (reinforced with a layer of segments inside the original segment), and steel plate reinforcement. Howe...

AI Technical Summary

Problems solved by technology

However, the above treatment measures have the following shortcomings: 1. The building boundary has been greatly reduced, which threatens the safety of vehicle operation; 2. The above measures are all passive force-bearing structures, that is, after the reinforcement is completed, they only bear the internal force generated by their own gravity. It cannot share the internal force of the original segment, and will only play its role when the original segment continues to undergo a large deformation, and jointly bear the external load; 3. Since it is a passive force-bearing structure, the reinforced segment and the original segment The connection strength becomes the weak link of the reinforcement effect; 4. The construction process is complicated, which affects the normal operation of the vehicle

5. It is necessary to drill more holes or anchor bolts on the original segment, which will damage the bearing capacity of the original segment

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