Pit merging construction method for adjacent foundation pits

The invention relates to a combined pit construction method for adjacent foundation pits. The combined pit construction method comprises the following steps that two foundation pits and an area between the two foundation pits are excavated at the design positions of the two adjacent foundation pits at the same time to form an integral communicating space; and the first supporting beam is constructed, so that the first supporting beam is connected to the opposite side walls of the two foundation pits in a jacking mode. The two foundation pits and the area between the two foundation pits are excavated at the same time to form the whole communicating space, the first supporting beams are connected to the opposite side walls of the two foundation pits in a jacking and supporting mode, the whole two combined foundation pits are supported and reinforced, due to the fact that the two foundation pits can be constructed synchronously, the construction efficiency is improved, and the construction cost is reduced. And c