A prefabricated steel pipe concrete support and its manufacturing method

Abstract

The invention discloses a prefabricated yielding concrete-filled steel tube support and a manufacturing method thereof. The prefabricated yielding concrete-filled steel tube support consists of a steel tube self-compacting concrete component and a yieldable joint. The steel tube self-compacting concrete component consists of steel tubes and self-compacting concrete packed in the middles of the steel tubes, the yieldable joint consists of a cup-shaped fixing block, a cylindrical rubber pressure bearing body and a sleeve. The multi-section steel tube self-compacting concrete component is assembled into a yieldable concrete-filled steel tube support through the yieldable joint. The prefabricated yielding concrete-filled steel tube support is manufactured by adopting an prefabricated method, has the characteristics of quick assembly and the guaranteed of construction quality, can effectively release the pressure of surrounding rock at the same time, and can be widely applied to the supportand deformation control of underground engineering tunnels.

Description

technical field [0001] The invention belongs to the field of support for underground construction projects such as tunnels and roadways, and relates to the support of tunnels, roadways and the like with steel pipe concrete supports. [0002] technical background [0003] The safety of the roadway is related to the safety of the entire coal mine mining. With the continuous deepening of the mining depth of the coal mine, higher requirements are put forward for the support technology of the coal mine roadway. After decades of development, coal mine roadway support technology has developed from the initial wooden support to today's relatively advanced anchor rod, anchor cable, anchor shotcrete and the combined support technology shared by various support technologies. These support technologies have alleviated the difficult roadway support dilemma to a certain extent, but there are still failure cases in roadways supported by these technologies. [0004] Aiming at the difficulty...

AI Technical Summary

Problems solved by technology

However, the existing concrete-filled steel tube support is a rigid support system, and there are many problems in simply using concrete-filled steel tube support for roadway support. Excessive pressure will cause support failure

The existing concrete-filled steel tube support often suffers from bending failure, and the bending bearing capacity is insufficient. The concrete in the tube cannot be strengthened early, and it often takes 28 days to play a supporting role.

At the same time, the existing concrete-filled steel tube support is poured concrete on the roadway support site, and the concrete adopts conventional commercial concrete, which has the disadvantages of inconvenient construction and difficult compaction of the concrete in the tube

Therefore, in order to overcome the shortcomings of the existing roadway concrete-filled steel pipe supports that cannot adapt to the large deformation of the surrounding rock, the construction is inconvenient, and the concrete in the pipe is difficult to pour and compact, it is particularly urgent to improve the existing technology

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