The fixed end plates are arranged at the front and rear ends of the Larsen steel sheet pile. The plate surface of the fixed end plate is provided with through holes. The plate is set between the Larsen steel sheet piles, and the partition is provided with rope fixing holes. The fixing ropes are respectively fixed to the through holes of the end plate and the rope fixing holes of the partition. The end plate and the fixed rope are connected to the fixed end plate to prevent the building materials from slippi