Method for constructing three-section type inhaul cable

The invention discloses a method for constructing a three-section type inhaul cable in cable-stayed bridge construction. The method comprises the following steps of: firstly, a horizontal cable (2) of a bridge tower (1) is synchronously and symmetrically assembled according to a sequence of bottom up, and initial tension is applied once; secondly, when the bridge tower (1) and a girder (4) are constructed, a stayed cable (3) is assembled synchronously and symmetrically in longitudinal and transverse directions according to a sequence of bottom up and from a direction close to the bridge tower to a direction far away from the bridge tower, and initial tension is applied once; and thirdly, the cable force and cable shape are monitored and regulated in the construction process. According to the construction method, the construction problem of a three-section type inhaul cable when the bridge tower of a cable-stayed bridge is provided with a horizontal cable connected sub-tower can be solved. The construction method is suitable for construction of the three-section type inhaul cable of the cable-stayed bridge with the horizontal cable connected sub-tower, and is also suitable for construction of a cable-like structure.