Reinforcing structure suitable for dual-arch tunnel mid-partition and construction method

Abstract

The invention discloses a reinforcing structure suitable for a dual-arch tunnel mid-partition and a construction method. The reinforcing structure comprises at least four steel web plates, the multiple steel web plates are sequentially welded to form the star-flower-shaped section manner, the embedding capacity of the reinforcing structure and the mid-partition can be greatly improved, the contactarea of the reinforcing structure and a rock-soil body is greatly increased, and the structure whole distortion-resisting capacity is improved. Grouting steel floral tubes are arranged on the two sides of each steel web plate, compaction between the reinforcing structure and the rock-soil body can be improved through pressure grouting, side friction resistance is greatly increased, and the unevendeposition of the mid-partition can be controlled. The two sides of each steel web plate are provided with steel ribs and a vibrating wire type earth pressure box, the steel ribs achieve the effect of improving the side friction resistance, improving the local stability and the antitorque capacity of the steel web plates and the protecting the earth pressure box, the vibrating wire type earth pressure box above the steel ribs can achieve real-time monitoring of stress of the reinforcing structure, in combination with conventional monitoring and measuring of the mid-partition, and the stable state of the mid-partition can be more comprehensively mastered.

Description

technical field [0001] The invention relates to the technical field of multi-arch tunnel construction, in particular to a reinforcement structure and a construction method suitable for a partition wall in a double-arch tunnel. Background technique [0002] Due to its space-saving, smooth line, beautiful appearance, and ability to overcome terrain obstacles, the double-arch tunnel has become one of the tunnel forms often used in mountainous road tunnels and urban short tunnels in recent years. Compared with ordinary single-arch tunnels, the biggest difference between double-arch tunnels is that the two arches are connected by a partition wall. Therefore, the partition wall becomes an important force-bearing component of a multi-arch tunnel, and its stability is very important. It is directly related to To the construction safety, construction progress and operation safety of the double-arch tunnel. Therefore, it is necessary to strengthen the partition wall to improve the st...

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Problems solved by technology

Therefore, it is necessary to strengthen the partition wall to improve the stability of the partition wall. Due to the special structural form of the partition wall and the narrow construction space of the double-arch tunnel, the common foundation reinforcement method at this stage is It is not applicable to the construction of the partition wall in multi-arch tunnels, and cannot meet the control requirements of the partition wall for uneven settlement

[0003] In addition, the excavation section of the double-arch tunnel is often large, and the excavation in parts produces multiple disturbances to the double-arch, making its stress state in a dynamic change, and the bias caused by the construction process will affect the stability of the partition wall. In severe cases, it will cause deflection, cracking and uneven settlement of the partition wall, seriously affecting the construction safety of the double-arch tunnel

The inventor found that the commonly used reinforcement form at this stage is to add steel frames or supports on both sides of the partition wall according to the span of the pilot tunnel to temporarily reinforce the partition wall, and then remove the steel frames or supports after the construction is completed. The method is time-consuming and labor-intensive, occupies construction space, seriously affects construction efficiency, and cannot guarantee the stability of the partition wall in the operation phase of the double-arch tunnel after demolition

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