Patent ID: 11970945
Assignee: CHONGQING UNIVERSITY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 1:
2. The hole protection system for coal seam slotting and fracturing combined drainage according to claim 1, further comprising a second flexible support; wherein the second flexible support comprises a circular pipe I and a circular pipe II, and a plurality of annular support pipes arranged between the circular pipe I and the circular pipe II; each annular support pipe comprises a plurality of unit waves, and the unit waves are arranged in sequence along the circumferential direction; two opposite wave peaks of two adjacent annular support pipes are fixedly connected; an inner cavity of the second flexible support is communicated with a hydraulic pump; fixed tractors drive the circular pipe I and the circular pipe II to approach during working, and the annular support pipes deform and fit the slot; the second flexible support in the contracted state is sleeved on the pipe body of the water injection support pipe under the non-working condition; and the water injection hole is communicated with the inner cavity of the second flexible support.