Structure for supporting foundation pit based on steel edge-arch structure

A structure for supporting a foundation pit based on a steel edge-arch structure, comprising:

• an enclosing purlin beam;
• a plurality of support beams;
• a plurality of triangular supports;
• and
• the steel edge-arch structure;
• wherein the plurality of support beams are located at an inner side of the enclosing purlin beam;
• the plurality of triangular supports are arranged on the enclosing purlin beam;
• a base edge of each of the plurality of triangular supports is fixedly provided on the enclosing purlin beam;
• an end portion of each of the plurality of support beams is supported on the enclosing purlin beam through a corresponding triangular support, and the end portion of each of the plurality of support beams abuts on a side edge of the corresponding triangular support;
• the steel edge-arch structure is located between two adjacent triangular supports;
• the two adjacent triangular supports consist of a first triangular support and a second triangular support;
• the steel edge-arch structure comprises two first haunched members, and a bracing beam located between the two first haunched members;
• one of the two first haunched members is provided between one side edge of the first triangular support and the enclosing purlin beam, and the other side edge of the first triangular support abuts against an end portion of a corresponding support beam;
• the other of the two first haunched members is provided between one side edge of the second triangular support and the enclosing purlin beam, and the other side edge of the second triangular support abuts against an end portion of a corresponding support beam;
• and
• one side of each of the two first haunched members is connected to a side edge of each of the two adjacent triangular supports, and the other side of each of the two first haunched members is connected to the enclosing purlin beam;
• one end of the bracing beam abuts on one of the two first haunched members, and the other end of the bracing beam abuts on the other of the two first haunched members.