Underpinning method of seismic isolation reinforcing column of existing frame structure

Abstract

The invention discloses an underpinning method of the seismic isolation reinforcing column of an existing frame structure. The method includes: wrapping upper and lower frame columns at a position where an isolation bearing is mounted with steel pipes and pouring concrete into the steel pipes to form steel pipe concrete to obtain the upper and lower support piers of the isolation bearing, mountinghoops with brackets on the upper and lower support piers, jacks or temporary supports are placed on the hoops and used for load underpinning during frame column cutting and isolation bearing mounting, and demounting the hoops for recycling after the isolation bearing is mounted. The method has the advantages that the construction of the isolation support piers is simplified greatly, the constructed isolation support piers serve as one part of an underpinning system, the hoops can be demounted and recycled, and building attractiveness and functions cannot be affected after the construction.

Description

technical field [0001] The invention relates to a reinforcement method for buildings, in particular to an underpinning method for columns reinforced by seismic isolation bearings in existing frame buildings, and belongs to the field of seismic reinforcement. Background technique [0002] When the existing frame structure is subjected to seismic isolation reinforcement, it is necessary to cut off a part of the column of the original frame and replace it with a seismic isolation support. Therefore, the load of the original building needs to be transferred to the foundation through the underpinning system during the reinforcement process. At present, when the frame structure is isolated and strengthened in China, the main method used for the load underpinning of the frame column is: the reinforced concrete underpinning node of the frame column through planting bars and post-cast concrete is adopted, and the steel concrete underpinning node is used. [0003] The use of reinforce...

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Problems solved by technology

[0003] The use of reinforced concrete underpinning nodes for underpinning has some disadvantages: since the upper and lower piers of the seismic isolation bearing need to meet the bearing capacity requirements under rare earthquakes, the reinforcement of the seismic isolation support piers is usually very large , resulting in difficulties in the construction of the pier; the size of the newly added columns is generally large, which affects the layout and function of the building; The underpinning node is not removable

If the steel-concrete underpinning joint is used, although the construction period is short and the cross-section of the underpinning member is small, the construction techniques such as installing section steel, drilling holes and bolts, and grouting between the section steel and the column are relatively complicated. Rear underpinning nodes are also non-removable

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