Pile foundation underpinning structure

The utility model relates to the technical field of pile foundation underpinning, in particular to a pile foundation underpinning structure. The pile foundation underpinning structure comprises a pilefoundation, a bearing platform, a jack and an underpinning plate, and the bearing platform is fixedly arranged on the pile foundation; the bottom end of the jack is fixedly connected with the bearingplatform, the top end of the jack is fixedly connected with the underpinning plate, and the underpinning plate is provided with a cambered surface used for bearing a natural gas pipeline. The supporting device has the following effects: 1, the supporting device has the advantage that the natural gas pipeline can be supported after the ground is settled; 2, the natural gas pipeline is placed on the underpinning plate stably and is not easy to deviate; 3, the natural gas pipeline is not easily damaged by collision when being arranged in the pipe ditch, and the service life of the natural gas pipeline is long; 4, the nat