A shield type TBM segment backfill grouting expansion type sealing device and construction method

Abstract

The invention discloses a backfill grouting expansion type sealing device of a shield type tunnel boring machine (TBM) segment and a construction method. The sealing device involves a rubber capsule and a fixed facility thereof, an air filling and exhaust port, a rubber capsule installation groove structure and construction steps, wherein the rubber capsule is fixed to the interior of a rubber capsule installation groove by virtue of a rubber capsule fixing strip, and the size and length of the rubber capsule can be adjusted as required; a segment filling tube hole, a segment valve hole, the rubber capsule installation groove and a rubber capsule fixing strip installation groove can be prefabricated or formed at a later stage, and the sizes can be adjusted according the size between the segment and surrounding rocks; and the construction steps comprise forming of the segment filling tube hole, the segment valve hole, the rubber capsule installation groove and the rubber capsule fixingstrip installation groove, installation, air exhaust and filling of the rubber capsule and the like. According to the backfill grouting expansion type sealing device, gaps between the shield type TBMsegment and the surrounding rocks can be quickly and effectively sealed, so that the blocking and sealing requirements of backfill grouting are satisfied.

Description

technical field [0001] The invention relates to the field of underground engineering construction, in particular to an external grouting sealing device for tunnel excavation segments and a construction method. Background technique [0002] The shield-type TBM advances with the excavation face during the excavation process, and establishes a connection between the surrounding rock and the segment lining through the bean gravel and mortar backfilling process, so as to achieve the purpose of the segment providing the supporting force of the surrounding rock. Due to the tapered design of the shield-type TBM shield in actual engineering, the gap between the tail shield and the segment is small, the gap between the shield and the surrounding rock, and between the segment and the surrounding rock is large, and the segment and the shield There are no bean-gravel and mortar barrier components that are prone to the following disadvantages: (1) There are no bean-gravel and mortar barri...

AI Technical Summary

Problems solved by technology

Due to the tapered design of the shield-type TBM shield in actual engineering, the gap between the tail shield and the segment is small, the gap between the shield and the surrounding rock, and between the segment and the surrounding rock is large, and the segment and the shield There are no bean-gravel and mortar barrier components that are prone to the following disadvantages: (1) There are no bean-gravel and mortar barrier components. The bean-gravel and mortar are in the natural blow-fill and filling modes respectively, and it is easy to form backfill cavities at the top of the cave. (2) When the distance between the backfill part and the shield is small, the pea gravel and mortar enter the gap between the shield and the surrounding rock, and the cement grout is easy to cement the shield, while the bean gravel is easy to get stuck (3) When the distance between the backfill part and the shield is large, the backfill is not timely, and it is easy to cause the unsupported section of the surrounding rock to be too long, the deformation is too large, and the TBM equipment is locked.

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