Yielding adaptor of well wall in frozen well, and construction method

Abstract

The shrinkable shaft wall joint of frozen well and its construction method are characterized in that a ring-shaped cylindrical body with a cross-section in the shape of "I" is arranged, the top is an upper flange, the bottom is a lower flange, and the upper flange is Between the upper flange and the lower flange are at least two ring-shaped vertical plates for carrying longitudinal force. On the outer circumference of the annular cylinder, the load-bearing level is bridged between the upper flange and the lower flange. The pressure arc-shaped plate is located on the inner vertical plate on the inner periphery of the annular cylinder, and is provided with an asphalt injection port, and each ring-shaped vertical plate is respectively provided with through asphalt injection holes. By arranging several joints of the present invention vertically along the well wall of the frozen well, the additional force vertically acting on the well wall can be effectively reduced, the safety of the well shaft can be ensured, and the well wall can be effectively prevented from breaking.

Description

Technical field: [0001] The invention relates to a shaft wall joint of a frozen well, more specifically a coal mine vertical shaft shaft used for construction in a deep alluvial layer using a freezing method. The joints of well wall structure and the construction method of joints. Background technique: [0002] Since 1987, there have been more than 70 coal mine vertical shaft rupture accidents in Huaibei, Xuzhou, Datun, Yanzhou, Yongxia and Dongrong mining areas, mainly shaft shafts constructed by freezing method. The existing research results show that: the main reason for the failure of these well shafts is that the bottom aquifers in these mining areas are directly covered on the coal measure strata. Melting settlement, the effective stress in the soil gradually increases, which causes the soil layer around the wellbore to consolidate and settle, and a considerable vertical additional force is applied to the wellbore. The wall fails due to insufficient strength. Inven...

AI Technical Summary

Problems solved by technology

The existing research results show that: the main reason for the failure of these well shafts is that the bottom aquifers in these mining areas are directly covered on the coal measure strata. Melting settlement, the effective stress in the soil gradually increases, which causes the soil layer around the wellbore to consolidate and settle, and a considerable vertical additional force is applied to the wellbore. The wall fails due to insufficient strength

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