Grouting sleeve for reinforcement connection
- 产品详情
Application fields:
Concrete structure system, as the largest application scale of building structure type, is an important part of the development of construction industry industrialization, and prefabricated concrete structure will become the main direction of the development of construction industrialization. The connection of precast concrete members, especially the connection of reinforcement, is the key technology of prefabricated concrete structure. In the traditional cast-in-place concrete structure, mechanical connection methods such as threaded sleeve connection, lap connection, welding connection or extrusion sleeve are used for the connection of steel bars. The construction of steel bar connection is more complicated, and the connection of reinforcement must be completed before pouring concrete. It is not suitable for prefabricated concrete structure, but grouting sleeve is mainly used in prefabricated structure construction Connect the reinforcement.
According to the design specifications of JGJ 107-2010 "technical specification for mechanical connection of reinforcement", JG / T 398-2012 "grouting sleeve for reinforcement connection", JGJ 355-2010 "technical specification for application of grouting connection of steel bar sleeve" and drawing on foreign advanced technology, the company has carried out in-depth research on grouting type steel bar connection technology for Bridge precast assembly technology, and formed corresponding finished product technology.
Applicable standards:
1. JGJ 107-2010 technical specification for mechanical connection of steel bars
2. JG / T 398-2012 grouting sleeve for reinforcement connection
3. JGJ 355-2010 technical specification for application of steel sleeve grouting connection
4. JG / T 408-2013 grouting materials for sleeve connection of reinforcement
5. GB 1499.2-2007 steel for the reinforcement of concrete Part 2: hot rolled ribbed bars
6. GB 13014-1991 steel bars for waste heat treatment of reinforced concrete
Performance features:
1. High sleeve connection strength: the joint strength meets the requirements of grade I joint performance in the industrial standard JGJ 355-2010 "technical specification for application of reinforced sleeve grouting connection". The tensile strength of the reinforcement joint is not less than 1.15 times of the actual tensile strength or the standard value of the tensile strength of the reinforcement, with small residual deformation and high ductility and repeated tension and compression properties;
2. Sleeve processing and high-strength mortar factory operation, stable quality, no occupation of construction period;
3. The unique positioning and sealing design makes the installation of sleeve and reinforcement on site as well as the assembly of prefabricated components fast and accurate;
4. Wide range of application: it is suitable for the connection of 16-50mm diameter steel bars.
System advantages:
1. The product is a steel bar connection technology developed by our company for the needs of prefabrication and assembly of urban bridge substructure in China, and the technology is mature;
2. Compared with the traditional full framing method, the number of field workers used in the grouting sleeve connection technology is only about 15%, and it takes less than 10% to complete the same amount of work, which greatly reduces the labor cost;
3. High strength casting is preferred for sleeve, with high production efficiency and stable quality. After years of research and continuous improvement, the performance of sleeve grouting material is higher than the relevant standards at home and abroad, and the performance is stable;
4. Complete set, can provide various accessories, construction equipment and construction guidance.
Construction of grouting sleeve for steel bar connection -- full grouting sleeve
The grouting sleeve for steel bar connection developed by our company is mainly composed of grouting sleeve, reinforcement, high-strength mortar (or grouting material), sealing ring, end cover, grouting pipe (optional), plug and rubber plunger (accessories for positioning during installation).
Reinforcement selection:
● meet the requirements of GB 1499.2 and GB 13014;
● the diameter of reinforcement is 20-40mm, which shall be purchased according to the specification of engineering design;
There are three grades of steel bar grades: HRB335, HRB400 and HRB500, and HRB400 is commonly used.
The strength grade of grouting sleeve produced by our company is not lower than the steel bar grade HRB400.
Brief analysis of accessories:
● grouting pipe
One end of the pipe is designed to be connected with the sleeve by thread, and the inner hole is not less than 15mm. One pipe is designed on both sides of the sleeve, one is used for grouting and the other is used for grouting. The size of the two pipes is the same.
● plug
The plug is made of rubber, which is used to block the grouting pipe before and after grouting, to prevent impurities and concrete from entering the pipe before grouting, and to prevent the leakage of high-strength mortar that has been poured into the sleeve after grouting.
Sealing ring
The sealing ring is generally made of rubber. The conical sealing ring is convenient for steel bar alignment and installation. It is installed at the embedded end of the sleeve to prevent concrete from entering the sleeve during prefabrication.
● end cover
The end cover is generally made of rubber. The design size of the end cover is larger than the outer diameter of the grouting sleeve. The inner hole is closely matched with the threaded reinforcement. It is installed on the end face of the grouting sleeve when splicing to prevent the concrete from entering the sleeve when the cushion mortar is poured.
Rubber plunger
The rubber plunger is a positioning and sealing device composed of cylindrical rubber ring, bolt, nut and pressing plate. It is used to position the grouting sleeve on the end template and realize sealing, so as to prevent the concrete from entering the sleeve during concrete pouring. After the concrete is hardened, it can be removed when the bottom formwork is removed. The rubber plunger is not a part of the structural connection and can be used repeatedly.
