PBA engineering method tunnel water-stop curtain construction method based on hole guiding technology

Abstract

The invention belongs to the technical field of tunnel water stop construction, and discloses a PBA engineering method tunnel water-stop curtain construction method based on a hole guiding technology.The PBA engineering method tunnel water-stop curtain construction method comprises the steps of carrying out surveying, setting out and manual hole breaking, embedding a protective casing, placing ahole guide drilling machine in place, drilling holes by using the drilling machine, measuring the inclination of pile positions, placing PVC pipes down the holes, lifting drill rods, forming the holes, withdrawing the drilling machine, configuring and checking grouting equipment, preparing slurry, and performing rotary jet grouting and stirring to form a pile. According to the PBA engineering method tunnel water-stop curtain construction method based on the hole guide technology, multiple drilling machines can operate simultaneously in the construction process, operators are fewer, labor costis saved, construction period is shortened, and construction safety is guaranteed; and a thin sand layer can be blocked by embedding the protective casing, so that the influence of hole collapse on jet grouting pile formation is avoided. Moreover, a PBA method is adopted for construction, the number of required excavation steps is small, the construction period is shortened, the settlement generated on the ground surface is smaller, and the effects of field construction and ground settlement control are good.

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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