Water-rich sand gravel stratum connecting tunnel underground excavation crossing urban main road construction method
A construction method and technology of sand and pebble, applied in drainage, tunnel, tunnel lining and other directions, can solve the problems of poor formation self-stability and high excavation risk, and achieve the effect of fast construction schedule, effective formation subsidence control, and reasonable measures.
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[0027] Example 1
[0028] Construction of a subway station in a central area of a northern city. The subway station is located in a prosperous part of the city, and it needs to go under the main urban road during construction. There is a cross section at the west end of the interval, which has many types of cross-sections and frequent conversions; and there are many abrupt cross sections, and the excavation contours of the cross-sections differ greatly. Conventional methods cannot complete the conversion of large abrupt cross sections. The maximum cross-section is 15m×12m, and the distance between the two The adjacent standard section is only 2.3m. The main structure of the section is mainly located in the medium-coarse sand layer, silty fine sand layer and pebble-cobble gravel layer. During the initial excavation, the soil is disturbed many times, which will directly affect the settlement of the road and the upper pipeline.
[0029] Therefore, after a multi-party plan is final...
Example Embodiment
[0041] Example 2
[0042] A construction method for crossing urban arterial roads through undercut excavation of a crossover section in a water-rich sand and gravel stratum. Such as figure 1 As shown, the method includes the following steps:
[0043] a. Preparation for construction, and dewatering construction is required before construction, and the water level drops to 0.5-1m below the structural floor. And promptly conduct open drainage treatment of the stagnant water between layers to ensure construction safety;
[0044] b. Perform stratum grouting reinforcement on the surrounding stratum of the crossover section. After the stratum grouting reinforcement is completed, set up temporary steel supports at the crossover section, and then build the arched pipe shed and carry out the pipe shed grouting reinforcement;
[0045] c. Undercut construction of the crossing section, large cross-sections are excavated by the double sidewall pilot method: excavation of the first pilot pit on th...
Example Embodiment
[0066] Example 3
[0067] A construction method for crossing urban arterial roads through undercut excavation of a crossover section in a water-rich sand and gravel stratum. Such as figure 1 As shown, the method includes the following steps:
[0068] a. Preparation for construction, and dewatering construction is required before construction, and the water level drops to 0.5-1m below the structural floor. And promptly conduct open drainage treatment of the stagnant water between layers to ensure construction safety;
[0069] b. Perform stratum grouting reinforcement on the surrounding stratum of the crossover section. After the stratum grouting reinforcement is completed, set up temporary steel supports at the crossover section, and then build the arched pipe shed and carry out the pipe shed grouting reinforcement;
[0070] c. Undercut construction of the crossing section, large cross-sections are excavated by the double sidewall pilot method: excavation of the first pilot pit on th...
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