A connection method of basic magnesium sulfate cement concrete prefabricated frame nodes

Abstract

The invention discloses a connection method of a basic magnesium sulfate cement concrete assembled frame node, comprising the following steps: step 1, pouring prefabricated beams and prefabricated columns respectively; during the pouring of the prefabricated beams, the main reinforcement of the prefabricated beams adopts end closure In the pouring of the precast column, the main reinforcement of the precast column is directly drawn out; step 2, after the precast column is in place, a temporary support system is set, the precast beam rests on the temporary support system, and the edge of the precast beam is flush with the edge of the precast column The steel hoop cover is made of four angle steels welded by several stirrup rings; the main reinforcement of the prefabricated column is covered with a steel hoop cover. 1. The core area of ​​the node between the prefabricated column and the prefabricated beam is post-cast with basic magnesium sulfate cement concrete castable; the basic magnesium sulfate cement concrete castable is a castable based on basic magnesium sulfate. The invention has the advantages of reliable construction, good shock resistance and the like.

Description

technical field [0001] The invention belongs to the field of construction engineering, and relates to a connection method of assembled concrete frame nodes, in particular to a connection method of basic magnesium sulfate cement concrete assembled frame nodes. Background technique [0002] The prefabricated frame refers to a frame structure building that is processed and manufactured in the factory with prefabricated columns, beams, slabs and other components and accessories, transported to the construction site, and assembled and installed on site through reliable connection methods. The beam-column joints are an important factor affecting the seismic performance of prefabricated frame structures. [0003] At present, the connection methods of nodes are mainly divided into two types: "wet connection" and "dry connection". The assembled integral node in "wet connection" is the most widely used node form in my country at present. The post-cast concrete used in the node area a...

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Problems solved by technology

The post-cast concrete used in the node area at this stage is mainly ordinary Portland concrete, which is aimed at the node pouring of basic magnesium sulfate cement concrete (BMSCC) prefabricated buildings and ordinary Portland cement concrete prefabricated buildings, ductility and the difference between old and new concrete. It is difficult to guarantee the performance such as the adhesion between

In addition, due to the design or construction errors of prefabricated components, the collision of steel bars is mainly the collision of the main reinforcement of prefabricated beams and the main reinforcement of prefabricated columns, which makes it difficult to install prefabricated beams and column stirrups in joint areas. Problems often lead to more serious problems such as cutting off the main reinforcement without authorization during construction, uneven spacing of the stirrups when installing the stirrups in the joint area, or even missing the installation of the stirrups in the joint area, which have a significant impact on the seismic performance of the joints and cause safety hazards

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