Grooving method for ultra-deep round foundation pit

Abstract

The invention discloses a grooving method for an ultra-deep round foundation pit. The grooving method comprises the following steps that for a firstly-grooved segment, firstly, a grab machine is used for grabbing soil in a firstly-grabbed area of a first segment, then, a spin dig drill is used for excavation to form a hole in the division line between a first wall segment and a second wall segment, one edge of the firstly-grabbed area is located on the division line between the first wall segment and the Nth wall segment, a certain distance exists between the other edge, opposite to the edge, of the firstly-grabbed area and the first hole, and the grab machine is used again for removing the rest of a soil body in the firstly-grooved segment; grooving is carried out on the second wall segment to the (N-1)th wall segment sequentially, when grooving is carried out on the Xth wall segment, the spin dig drill is used for excavation to form a hole in the division line between the Xth wall segment and the (X+1)th wall segment, and then the grab machine is used again for grabbing a soil body between the Xth hole and the (X-1)th hole; the grab machine is used for grabbing a soil body between the (N-1)th hole and the first hole. By the adoption of the technical scheme, the problem that when grooving is carried out on an ultra-deep round foundation pit, the modulus of a grab machine is smaller than the grooving width of a single segment of a continuous wall is solved.

Description

Technical field [0001] The present invention involves an ultra -deep round foundation pit into a groove, belongs to the field of underground engineering. Background technique [0002] With the development of my country's economic construction, in order to meet the needs of urban transportation, a large number of cross -river channels and submarine tunnels have been built one after another. The construction of the shield method can achieve automated operations due to fast excavation, promotion, unearthed, assembly lining, etc. Low labor intensity, does not affect the characteristics of ground traffic and facilities at the same time, does not affect the characteristics of underground pipelines and other facilities. [0003] During the construction, after the shield machine was constructed to a certain project volume in the tunnel of the tunnel, the tool wear needs to be replaced and replaced. At the same time, in order to meet the needs of ventilation and maintenance in the tunnel ...

AI Technical Summary

Problems solved by technology

In actual construction, sometimes the grab modulus of the grab machine is smaller than the width of the groove of a single floor connecting wall, which makes the construction difficult

However, after the first grab of the circular continuous wall is completed, if the next grab is carried out directly, the force on the left and right of the grab machine will be uneven, and if the groove continues, the groove forming effect will be seriously affected.

Each trough section is of the opposite sex, so it must be considered comprehensively when forming the trough. If the verticality of the trough forming in the front, rear, left and right cannot be guaranteed, the reinforcement cage may not be lowered to the design elevation.

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