Shield machine balance originating method

Abstract

The invention discloses a shield machine balance originating method, which comprises the following steps of: constructing a continuous wall envelope structure in a foundation pit; pouring a guide table in an originating well of the foundation pit; pouring a concrete counterforce wall in the originating well; assembling and debugging a shield machine in the originating well; arranging a first negative ring duct piece in the debugged shield machine, pushing the duct piece out of a shield tail to connect the counterforce wall, and sealing the duct piece; jacking a cutter head of the shield machine to the continuous wall, and backfilling the originating well with a sand layer, a concrete layer and a water layer from bottom to top; grouting in back of the duct piece wall; and performing advancement by the shield machine. Because the shield is backfilled in the well before the shield machine originates advancement, the pressure of water and soil inside and outside the foundation pit is balanced, water and sand are not burst when the shield machine originates advancement, and the safety of the foundation pit and the shield machine can be effectively ensured.

Description

technical field [0001] The invention relates to a method for starting a shield machine in tunnel shield construction. Background technique [0002] In the previous tunnel shield engineering, the shield generally uses the shield machine bracket to support the shield machine cylinder, and the thrust is provided by the reaction frame to make the shield excavate. The curtain plates together form the door sealing device, which prevents water and sand from gushing in the gap between the barrel and the door when the shield machine barrel enters the hole, and has a sealing effect. However, due to the limited pressure that the portal sealing device itself can withstand, in places where the foundation pit is deep and the groundwater level is high, the water and soil pressure is very high, and the water-stop rubber curtain is often easily broken down during the shield tunneling process, or Improper operation of the shield will cause the curtain to break, so that the outside water and ...

AI Technical Summary

Problems solved by technology

However, due to the limited pressure that the portal sealing device itself can withstand, the water and soil pressure is very high in places where the foundation pit is deep and the groundwater level is high, and the water-stop rubber curtain is often easily broken down during the shield initiation process, or Improper operation of the shield will cause the curtain to break, so that the outside water and soil will flow into the foundation pit through the gap between the cylinder and the portal, affecting the start of the shield, and in severe cases, it will also lead to the collapse of the start end, with very serious consequences

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