The construction method of the communication channel construction using the combination of the mjs method and the freezing method
A technology for connecting passages and construction methods, which is applied in the field of connecting passages in subway inter-tunnel tunnels, can solve problems such as hidden dangers of safety and sinking, and achieve the effects of improving performance, good stratum adaptability, and small loss of strength and stiffness.
Inactive Publication Date: 2016-08-24
TONGJI UNIV
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Problems solved by technology
Under normal circumstances, the existing technical level can ensure that the settlement of the tunnel during the shield tunneling is within the range required by the code. Once the freezing method is used to construct the communication channel, serious thawing settlement will occur when the permafrost thaws, and the maximum can reach more than 10cm. This has buried a huge safety hazard for the later subway operation, and at the same time requires a lot of human and financial resources to solve the problem of melting and sinking in the communication channel
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Embodiment 1
[0027] Embodiment 1: as figure 1 As shown, it is a schematic flow chart of a new construction method that is suitable for the construction of subway inter-section tunnel communication passages according to the present invention and uses the combination of the MJS method and the freezing method. The inventive scheme combines the advantages of the MJS method and the freezing method, and provides A new communication channel construction method that is safer, more efficient, and has lower long-term costs.
[0028] Such as Figure 2~Figure 6 As shown, the implementation steps of the new communication channel construction method include: ① Open the flange interface reserved on the steel pipe sheet, and construct MJS reinforcement piles below the communication channel bottom plate; Reinforce the soil above; ③ After the strength of the frozen reinforcement area meets the design requirements, install the prestressed steel frame; ④ Pull apart the steel pipe sheet and use the mining met...
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The invention relates to a contact passage construction method using the combination of the MJS method and the freezing method. The novel contact passage construction method is invented in order to overcome the defects of existing contact passage freezing method construction and make full use of the advantages of the MJS method. The novel contact passage construction method combines the MJS method and the freezing method organically, the adaptability to stratums is wider, and the safety reliability is higher. According to the technical characteristics of the two strengthening methods, the freezing method is adopted for strengthening above a contact passage, the MJS method is adopted for strengthening below the contact passage, and construction respectively using the two kinds of strengthening methods can be started successively or simultaneously to shorten the construction period according to the internal space conditions of the tunnel. Accordingly, when frozen soil thaws, the problem of thaw settlement does not occur in the tunnel; on the other hand, a permanent strengthened body formed by the MJS method provides a stable stratum environment for the later operation of the tunnel. In the long run, the contact passage construction method using the combination of the MJS method and the freezing method is safe, efficient, and low in long-run cost.
Description
technical field [0001] The invention relates to a method for constructing a communication channel of a tunnel in a subway section, in particular to a construction method for the construction of a communication channel combining the MJS method and the freezing method. Background technique [0002] With the development of the national economy, large and medium-sized cities are facing increasing pressure on ground transportation, so many cities have planned or are building subway projects. The communication channel is an important part of the subway interval tunnel, which shoulders important functions such as emergency passenger evacuation, water collection / drainage in the tunnel, etc. The freezing method construction is currently the most commonly used communication channel construction method. In this method, low-temperature salt water is used to freeze the soil around the communication channel to increase its strength, and then the mining method is used to excavate the comm...
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IPC IPC(8): E21D9/00E21D11/00E21D11/10E21D11/14
Inventor 张子新李佳宇张帆
Owner TONGJI UNIV