Prepressing method of flushing type bridge rubber raft

Abstract

The invention discloses a prepressing method of a flushing type bridge rubber raft. The prepressing method comprises the following steps: (1) preparatory work; (2) water bag arrangement: marking out in a bottom plate pressure test region according to the sizes and quantity of water bags in the scheme; and sequentially placing the water bags from the low end of a box girder bottom plate to the high end of the box girder bottom plate; (3) measuring tool mounting: mounting a water meter, which is used for recording the amount of delivered water, on a main pipe of each water point, assigning a designated person to each water point for recording data during step loading and adding the amounts of water of the water points to reach a prepressing value; (4) water source connection; and (5) step loading: stacking the water bags of which the weight is 1.2 times the load of a girder span on an erected support according to weight distribution conditions of girder section concrete just above the support, carrying out step prepressing for 72 hours, and observing subsidence by using a level gauge. By the prepressing method of the flushing type bridge rubber raft, continuous prepressing of the flushing type bridge rubber raft and recycling of water can be realized, and the cost-performance ratio is high.

Description

technical field [0001] The invention belongs to the technical field of preloading construction of cast-in-place prestressed concrete box girder brackets, and in particular relates to a preloading method for a flushing bridge rubber raft. Background technique [0002] Traditional cast-in-place concrete box girder supports are generally preloaded with dense materials such as stones, sand bags, or steel bars. However, the preloading of the above materials requires large-scale transportation equipment and lifting equipment, and the materials are temporarily stored and unloaded. Stacking takes a long time and occupies a lot of planes, which affects the normal construction flow. Especially in the construction of a large number of municipal bridge projects, occupying the construction plane is a big problem. It also has a negative impact on urban traffic. The use of water bags for box girder preloading can exactly solve all the above-mentioned contradictions, greatly reducing the c...

AI Technical Summary

Problems solved by technology

[0002] Traditional cast-in-place concrete box girder supports are generally preloaded with dense materials such as stones, sand bags, or steel bars. However, the preloading of the above materials requires large-scale transportation equipment and lifting equipment, and the materials are temporarily stored and unloaded. Stacking takes a long time and occupies a lot of planes, which affects the normal construction flow, especially in the construction of a large number of municipal bridge projects, occupying the construction plane is a big problem

It also has a negative impact on urban traffic

Images