Necking type steel bar connecting sleeve, connecting structure thereof and installing method of connecting structure

Abstract

The invention discloses a necking type steel bar connecting sleeve, a connecting structure thereof and an installing method of the connecting structure. The necking type steel bar connecting sleeve comprises a sleeve body and a connecting steel bar, wherein grouting holes are formed in the sleeve body; two ends of the necking type steel bar connecting sleeve are fixedly connected with necking openings; the end part of the connecting steel bar is fixedly connected with an enlarging head; the enlarging head can be inserted to the inner part of the sleeve body through the necking openings; two ends of the sleeve body are respectively arranged on the connecting steel bar in a sleeving way; concrete can be formed through solidification after concreting; the necking openings can limit the concrete and the enlarging head to move towards direction of pulling out sleeve; the enlarging head can be fixed to the inner part of the sleeve body by the concrete; the connecting steel bar and the sleevebody can be fixedly connected; one end, which is far away from the sleeve body, of the connecting steel bar is fixed to the inner part of a prefabricated slab required to be connected in a pre-embedded way; two prefabricated slabs can be connected; installation of the sleeve body is simple and convenient, the cost is low, and the connecting strength is high.

Description

technical field [0001] The invention relates to a steel bar connection structure, in particular to a necked sleeve connection structure. Background technique [0002] At present, the connection methods of prefabricated components in prefabricated concrete structure buildings, especially the vertical reinforcement connection methods of vertical components (prefabricated wall panels / columns) mainly include: 1) welding connection of embedded parts, 2) bolt connection of embedded parts , 3) There are three connection methods for steel sleeve grouting connection. [0003] 1) The welding connection of embedded parts is that the connecting steel plate is preset at the connecting part of the component, and after the prefabricated component is installed, the adjacent embedded steel plate between the components is welded and connected into one. [0004] Advantages: Simple installation and operation; Disadvantages: Due to the welding process, the performance of the connected steel pla...

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Problems solved by technology

[0004] Advantages: Simple installation and operation; Disadvantages: Due to the welding process, the performance of the connected steel plate is brittle, resulting in poor toughness / easy cracking / low connection strength of the steel plate, poor structural connection integrity / air tightness / seismic resistance, poor corrosion resistance / durability; now Belongs to obsolete technology, the market application range is small

The advantage is that the connection strength is higher than the welding strength, and the disadvantages are: high cost, poor structural connection integrity / air tightness / seismic resistance, poor corrosion resistance / durability; small market application range

[0009] Disadvantages: In practical application, the following problems need to be improved in the steel sleeve grouting connection technology: 1. The construction operation is difficult due to factors such as steel bar deformation, displacement, and small installation gap; 2. The problem of grout leakage is easy to occur and cannot be inspected; 3. .The operation process is complex, requiring special equipment, tools, materials, and personnel; 4. High cost and difficult to control the quality; 4. There are many factors affecting the quality of grouting materials (materials, water-cement ratio, mixing, grouting, grout leakage, personnel operation , application time, etc.), quality control is difficult; 5. Since the steel sleeve grouting connection technology is to bond the steel bar to the sleeve through the grouting material, the steel bar connection is realized by using the friction principle and function

Therefore, as the connection medium, the grouting material plays a decisive role in the quality of the connection. The grout must be full, without leakage, and without shrinkage. However, in the actual application process, especially the connection of vertical components (which is prone to leakage and cannot be inspected) is very difficult. Guarantee the quality of the connection, poor quality controllability; the quality of the connection directly affects the connection strength of the steel bar, forming an invalid connection (reinforcement core pulling phenomenon), causing hidden dangers to building safety

[0010] In addition, even if there is no problem with the quality of the steel sleeve grouting connection, there is still an unsolvable technical problem in the structural connection: the integrity of the structural connection of the vertical concrete prefabricated components, that is, the bottom of the prefabricated component and the cast-in-place layer of the laminated slab The problem of horizontal joints between

Because the strength of the mortar (adhesive / leveling layer) at the bottom of the component is lower than the strength of the concrete of the prefabricated component when the vertical prefabricated component is installed, the stress point is weak, which affects the poor integrity of the concrete structure and low seismic resistance.

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