A construction method of water-stop curtain for pba construction method tunnel based on approach hole technology

Abstract

The invention belongs to the technical field of tunnel water-stop construction, and discloses a tunnel water-stop curtain construction method based on the PBA construction method based on the leading hole technology, including measuring and setting out and artificially breaking holes, burying the casing, putting the leading hole drilling machine in place, and drilling with the drilling machine Hole forming, pile position inclination measurement, PVC pipe lowering for hole forming, drill lifting, hole forming, drill moving, configuration and inspection of spraying equipment, preparation of slurry, rotary spraying and stirring to form piles. During the construction process of the PBA construction method tunnel water-stop curtain construction method based on the leading hole technology provided by the present invention, multiple drilling rigs can work at the same time, with fewer operators, labor costs are saved, the construction period is shortened, and construction safety is ensured; The fine sand layer can be blocked to avoid the impact of the hole collapse on the pile formation. Moreover, the column hole method is adopted for construction, which requires fewer excavation steps, and can cause small surface settlement while shortening the construction period, and has a good control effect on site construction and ground settlement.

Description

technical field [0001] The invention belongs to the technical field of tunnel water-stop construction, and in particular relates to a method for constructing a tunnel water-stop curtain based on a PBA construction method based on a leading hole technology. Background technique [0002] At present, the closest existing technology: With the rapid development of my country's economic construction, land resources are increasingly scarce. In order to make full use of underground space to meet the needs of use functions and civil air defense projects, a large number of large ultra-deep buried Engineering, underground engineering presents the characteristics of compact site, short engineering distance, deeper and deeper depth, and large scale and size. The design and construction must choose a technically feasible and cost-effective enclosure structure scheme to ensure that the surrounding of the underground engineering and the foundation pit The safety and construction progress of t...

AI Technical Summary

Problems solved by technology

[0007] (1) The existing tunnel water-stop curtain construction method still stays at one time equipment can only form one pile, and every time the machine is moved, it must be repositioned, which is a waste of time, and it is also easy to cause adjacent piles to be nested incorrectly If it is in place, the water-stop effect cannot be achieved in the later stage

[0008] (2) The existing tunnel water-stop curtain method has high construction cost, slow construction speed, long cycle and high labor intensity

[0009] (3) In the existing tunnel spraying water-stop curtain method, the fine sand layer is easy to collapse holes, and then form broken piles, and the spraying is not dense, which is not conducive to ensuring the water-stop effect

[0010] Difficulties in solving the above technical problems: the underground space is narrow, and the construction work is difficult; the construction stratum is complex, the pebbles are large, the construction stratum is thick, and the mechanical requirements are high; the construction environment is complex, and the mud treatment and transportation are difficult

[0011] Significance of solving the above technical problems: Solve the quality problems that affect the water-stop effect, such as large verticality deviation, uneven pile diameter, broken piles, and uneven bite caused by ordinary jet grouting piles passing through unfavorable geology during construction, and fully ensure dark Construction safety of digging tunnels under the condition of no precipitation

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