Reinforcement structure and construction method suitable for partition wall in double-arch tunnel

Abstract

The invention discloses a reinforcement structure and a construction method suitable for a partition wall in a double-arch tunnel, which comprises at least four steel webs, and the star flower-shaped cross-section formed by welding a plurality of steel webs in sequence greatly improves the reinforcement. The embedding ability of the structure and the partition wall, the contact area between the reinforced structure and the rock and soil mass, and the improvement of the overall anti-distortion ability of the structure. On both sides of each steel web, grouted steel flower tubes are installed. Through pressure grouting and enhanced compactness between the reinforced structure and the rock-soil mass, the side frictional resistance is greatly increased to control the uneven settlement of the partition wall. Steel ribs and vibrating wire earth pressure cells are arranged on both sides of each steel web. The vibrating wire earth pressure cell above the rib can realize the real-time monitoring of the force of the reinforced structure, combined with the conventional monitoring and measurement of the partition wall, the stable state of the partition wall can be grasped more comprehensively.

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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