Mobile gantry frame and its construction method in the construction of large cantilever cover beam

Abstract

The invention discloses a movable portal used in construction of a bent cap of a large cantilever and a construction method of the movable portal. The movable portal is characterized in that a movable portal system is arranged according to construction of the bent cap of the large cantilever and comprises three units including a left unit, a middle unit and a right unit respectively; the structural style of the left unit is symmetric to that of the right unit, each of the left unit and the right unit consists of two movable portal bodies which are independent from each other, and the distance between the two movable portal bodies of each of the left unit and the right unit is equal to the width of a motorway on which vehicles can pass normally; movable universal wheels serve as castors of the movable portal bodies; and a helical tube serves as a supporting upright column of the middle unit, a sand box is arranged on the top of the helical tube, a distributive girder is arranged on the sand box, and bailey beams for paving bottom molds of the bent cap are supported on the movable portal system. The movable portal is used for construction of large bent caps of existing roads, can effectively shorten construction period, and guarantees road traffic.

Description

technical field [0001] The invention relates to a mobile gantry used in the construction of a large cantilever cover beam and a construction method thereof, which are used in the construction of a large cantilever cover beam on an existing road where the traffic flow is large, the safety requirement is high, the construction period is tight, and the traffic dredging cannot be changed. Background technique [0002] In the prior art, the construction of large cap beams usually adopts the form of steel pipe columns and Beley frames or the form of corbel brackets and Beley frames. But both forms have the same problems. One is the safety problem. When the bracket is assembled, due to the restriction that the road cannot be closed, it can only rely on additional personnel to protect the construction site, which has a large safety hazard; The second is the problem of construction progress. The construction period of the steel pipe column and Bailey frame method is about three days,...

AI Technical Summary

Problems solved by technology

But both forms have the same problems. One is the safety problem. When the bracket is assembled, due to the restriction that the road cannot be closed, it can only rely on additional personnel to protect the construction site, which has a large safety hazard; The second is the problem of construction progress. The construction period of the steel pipe column and Bailey frame method is about three days, but the installation of the column and Bailey frame is greatly affected by factors such as traffic and weather, and there are many uncontrollable factors, which greatly affect the construction process. Affect the construction progress, and the potential safety hazard is great and even affect the construction quality

Images