Ultra-deep sludge foundation pit transverse support construction device and method

The invention discloses an ultra-deep sludge foundation pit transverse support construction device and method. The ultra-deep sludge foundation pit transverse support construction device comprises a first-layer transverse support piece, a construction operation plate and a plurality of suspension cable systems. The first-layer transverse supporting piece is connected with an enclosure structure ofa foundation pit; the suspension cable systems comprise saddles, slings and joists; and the saddles are connected with the first-layer transverse support piece, and the construction operation plate is connected with the joists. The ultra-deep sludge foundation pit transverse support construction device has the beneficial effects that a safe, wide and comfortable construction working face is provided for on-site constructors, the ultra-deep sludge foundation pit transverse support construction device is suitable for construction of the foundation pit inner transverse support large in excavation depth, low in sludge be