Method for backfilling of tunnel construction through TBM method and equipment for method

Abstract

The invention relates to a backfilling method for tunnel construction through a TBM method and equipment for the backfilling method.The backfilling method that TBM pea gravel backfilling and grouting has many technical defects, the time limit for a project cannot be guaranteed, and backfilling quality is quite unstable.According to the backfilling method, backfilling is carried out at 360 degrees in a whole cavity segment between the duct piece outer wall and the surrounding rock wall of a TBM prefabricated lining structure, a bottom arch is backfilled with mortar and quick-setting mortar, arches on the two sides are backfilled with pea gravel grout, and a top arch is backfilled with composite mortar; in other way, the bottom arch is backfilled with mortar and quick-setting mortar, the arches on the two sides are backfilled with fine aggregate concrete and quick-setting fine aggregate concrete, and the top arch is backfilled with composite mortar.The technical advantages of mortar backfilling and fine aggregate concrete backfilling are fully utilized, pea gravel grouting and backfilling are replaced partially or completely, the technical defects of pea gravel grouting and backfilling are overcome, and particularly under the condition of unfavorable geology, the backfilling work efficiency is improved, and engineering quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of tunnel or tunnel construction, and in particular relates to a backfilling method and equipment for TBM tunnel or tunnel construction. Background technique [0002] Tunnel boring machine TBM (Tunnel Boring Machine), as the most advanced tunnel (hole) construction machine, has been widely used in countries all over the world. According to the support form, it is divided into three types, which are suitable for different geological conditions: ①Open type, often used in pure rock; ②Double shield, often used in mixed strata; ③Single shield, often used in inferior strata and groundwater higher strata. Among them, the single and double shield tunnel boring machine (TBM) excavation are all prefabricated reinforced concrete structural parts (segments) assembled or bolted for lining, and the cavity between the outer wall of the prefabricated segment and the surrounding rock must be backfilled densely. [0003] Th...

AI Technical Summary

Problems solved by technology

TBM is widely used because of its high efficiency in excavation and lining of prefabricated components (segments). The cavity backfill method between the outer wall of the prefabricated segment lining and the surrounding rock wall is full-section pea-gravel backfill grouting, but the TBM pea-gravel backfill grouting backfill method exists Many technical defects: First, there is no guarantee for the construction period, and there is no standardized construction standard and construction process (bean gravel preloading process, initial ring, establishment of closed ring, grouting hole, non-grouting hole, observation hole, closed grouting hole position). Determination, backfilling measures under adverse geological conditions, quota standards for hole sealing and pointing, etc.), de-grouting and leaking grouting are in a normal state, and a large amount of grouting makes the normal contact grouting process completely destroyed. Tunnels (holes) ) operation is expected to be uncertain, and economic benefits are low; second, the backfill quality is very unstable, and the bottom, side, and top arch coring compressive strength tests have proved that the coefficient of variation is too large, and the stress on the prefabricated component lining structure is not uniform, which brings negative impacts on tunnel operation safety. Hidden danger

[0007] 2. Bad geology, especially the influence of groundwater

[0016] 4. On the joint surface of the diffusion range of grouting in the first and last holes, there is water accumulation or blind area of ​​suffocation, and the consolidation is not dense

[0018] 6. The process of double-fluid grouting is washed by water, not only the mix ratio of cement slurry is destroyed, the concentration of water glass is further diluted, and the quick-setting effect is poor

[0019] Contractor Italy CMC Company Kunming Zhangjiu River Diversion Tunnel, Contractor Shanxi Hydraulic Engineering Bureau Xinjiang Eighty-one Daban Water Diversion Tunnel, Contractor China Tunnel Company Shaanxi "Yinhong Jishi" diversion tunnel, Contractor China Tunnel Company Qinghai "Yinda In projects such as Jihuang" water diversion tunnel, the effect of bean gravel backfill grouting is not satisfactory

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