Construction method of integrated pipe trench in soft soil

The invention discloses a construction method of an integrated pipe trench in soft soil. The construction method comprises step 1, digging out a multistage stepped foundation pit and a foundation pit bottom; step 2, digging out a drainage ditch at the top of a site located on each side of the foundation pit; step 3, laying a first geogrid layer at the foundation pit bottom so as to enable the first geogrid layer to cover the first stage of stepped foundation pit to reserve a space; step 4, performing construction on an integrated pipe body; step 5, backfilling the first stage of stepped foundation pit and enabling the reserved space portion to reversely wrap a soil body to be fixed on the integrated pipe body; step 6, laying a second geogrid layer on the second stage of stepped foundation pit so as to enable two ends of the second geogrid layer to be fixed on the integrated pipe body and the second stage of stepped foundation pit respectively to reserve a space, backfilling the second stage of stepped foundation pit and enabling the reserved space portion to reversely wrap the soil body to be fixed on the integrated pipe body; step 7, filling the stepped foundation pit according to the step 6; step 8, backfilling the stepped foundation pit located at the top of the integrated pipe body. According to the construction method of the integrated pipe trench in the soft soil, the shear bearing capacity of the foundation pit backfilling soil body can be improved, the settlement condition of the backfilling soil body is improved, and accordingly the settlement of the cross section tends to be uniform, the service life of a surface road is extended, the cost is low, and the process is convenient.