Slurry preparation-grouting integrated method for synchronous double-liquid grouting in shield tunnel

Abstract

The invention discloses a slurry preparation-grouting integrated method for synchronous double-liquid grouting in a shield tunnel, the integrated method adopts a mixing device and a grouting device which are connected with each other, and the integrated method comprises the following steps: S1, a section of trolley is additionally arranged on a shield tunneling machine; s2, preparing a solution A; s3, the liquid A and the liquid B are mixed at the shield tail to form mixed liquid; s4, the monitoring unit monitors the real-time flow of the liquid A and the liquid B, the mixed liquid is controlled to reach the gelatinization state, and the mixed liquid is synchronously injected into a shield tail gap through a grouting pipeline along with propelling of the shield tunneling machine; and S5, the grouting pipeline is flushed through high-pressure water. On one hand, short-distance transportation of the liquid A is achieved, performance loss is reduced, grouting quality is guaranteed, the construction amount of pipelines is greatly reduced, labor intensity and construction cost are reduced, synergism of pulping and grouting is improved, and construction efficiency is effectively improved; and on the other hand, accurate control and adjustment of the mixing ratio and the injection amount of the liquid A and the liquid B are achieved, and the precision of double-liquid synchronous grouting is improved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an integrated grout production-injection method for synchronous double-fluid grouting in a shield tunnel. Background technique [0002] During shield excavation, because the outer diameter of the shield cutter head is larger than that of the lining segment, and the shield shell has a certain thickness, in addition, there are phenomena such as over-excavation during the excavation process, and the segment is separated from the shield tail. Afterwards, there will be an annular gap between the segment and the formation, and synchronous grouting technology is usually used to fill the shield tail gap in actual shield tunneling engineering. At present, the commonly used grouting grouts in shield tunnel construction can be roughly divided into two types, namely single-fluid grouting materials and double-fluid grouting materials. Double liquid slurry is to pump A...

AI Technical Summary

Problems solved by technology

[0005]1. The transportation distance of the prepared liquid A pipeline is long, and with the excavation of the shield machine, there are problems of low construction efficiency and high failure rate of the pipeline, and due to Long-distance transportation of pipelines will easily reduce the homogeneity of cement-based materials, and the synergy with the grouting process will be poor, which will affect the construction quality;

[0006]2. If the open cut section from the starting working shaft to the ground has not been constructed, and the mortar truck transporting liquid A cannot enter the tunnel through the existing road, the mixed Liquid A needs to be vertically transported up and down through the shield starting working shaft into the tunnel, which requires a large amount of construction and high cost;

[0007]3. During grouting, it is difficult to adjust the flow rate of A and B liquids, and the accuracy is poor, resulting in inaccurate flow statistics and the inability to precisely control the mixing ratio of A and B liquids Therefore, the actual mixing ratio of liquid A and liquid B is likely to be quite different from the theoretical mixing ratio, making the synchronous grouting slurry unable to quickly cement and fill the pores, and it is easy to cause the segment to float, break, deform, and the water-stop sealing effect is weakened. The situation has an extremely adverse impact on the life cycle and safety of the entire project

Images