Sleeve valve pipe for reinforcing pit bottom of water-rich pebble bed deep foundation pit and construction process

The invention discloses a sleeve valve pipe for reinforcing the pit bottom of a water-rich pebble bed deep foundation pit and a construction process, and the sleeve valve pipe is used for reinforcingthe pit bottom of the water-rich pebble bed deep foundation pit, preventing the pit bottom from bulging and improving the stability of the foundation pit. The sleeve valve pipe is characterized by comprising a sleeve valve pipe body (1), a grouting pipe (2), grouting liquid (7), a manual sand filling layer (6), a drainage plate (5), a grout stopping plug (3), a connector (8), a rubber raft (4) anda conical plug (9). The construction process comprises the following steps: after surveying and setting out, positioning a drilling machine in place, drilling holes, preparing sand, installing the sleeve valve pipe, constructing a manual sand filling layer, conducting grouting in sections and sealing holes. The sleeve valve pipe is fixed through manual sand filling, river sand in the manual sandfilling layer can be flushed into a pebble stratum through high grouting pressure and grouting liquid and is effectively packed into gaps of the pebble stratum after being mixed with the grouting liquid, the gradation of the pebble stratum is changed, a better grouting effect is achieved, the manufacturing cost is low, and economic benefits are high.