The following is the relevant content about steel sleeve grouting connection technology brought to you by Zhongda Consulting for your reference.
Technical content
Rebar sleeve grouting connection technology refers to inserting ribbed steel bars into a grouting sleeve with a concave and convex surface in the inner cavity, and pouring special high-strength cement into the gap between the sleeve and the steel bars. After the grouting material is solidified, the steel bars are anchored in the sleeve to achieve a steel bar connection technology for prefabricated components. This technology embeds the grouting sleeve in the concrete component, and injects the grouting material into the sleeve from outside the prefabricated component through the grouting pipe at the installation site to complete the connection of the prefabricated component steel bars. It is the main form of stress-bearing steel bar connection in the prefabricated component. , mainly used for stress-bearing steel bar connections in various assembled monolithic concrete structures.
The steel sleeve grouting connection joint is composed of three materials: steel bars, grouting sleeves, and grouting materials. The grouting sleeves are divided into semi-grouting sleeves and full grouting sleeves. The joints connected by half-grouting sleeves One end is a grout connection and the other end is a mechanical connection.
The construction process of the steel sleeve grouting connection mainly includes: the prefabricated components complete the connection between the sleeve and the steel bar in the factory, the installation and fixation of the sleeve on the formwork, and the connection between the inlet and outlet slurry pipes and the sleeve. During the construction On-site completion of component installation, grouting cavity sealing, grouting material mixing with water and sleeve grouting.
The stress-bearing steel bar connection of vertical prefabricated components can use semi-grouting sleeves or full grouting sleeves. The components should adopt the grouting method of connecting cavities, and the connecting cavity areas should be reasonably divided. The components can also be grouted independently using a single sleeve, and a grouting layer should be provided at the horizontal joints before the components are in place. The grouting connection of the sleeve should be made of grouting material that matches the sleeve and has been confirmed by joint type inspection. Grouting equipment matching the material technology should be used to pour the grouting material from the grouting hole below the sleeve by pressure grouting. The grout outlet hole on the top of the sleeve flows out, and the grout outlet hole is blocked in time to ensure that the grouting material at the effective connection part in the sleeve is filled tightly.
The longitudinal stress-bearing steel bars of horizontal prefabricated components can be connected at the cast-in-situ belt with full grouting sleeves. After the sleeve is installed in place, the grouting hole and outlet hole of the sleeve should be located above the sleeve. Use special tools or equipment for single sleeve grouting to perform pressure grouting. The grouting material is injected from the grouting hole at one end of the sleeve and the grout is discharged from the other end. After flowing out of the grout port, the grouting slurry surface in the joints of the grout inlet and outlet holes should be higher than the highest point on the outer surface of the sleeve.
After the sleeve grouting construction, only after the compressive strength of the grouting material cured under the same conditions reaches 35MPa can subsequent construction that disturbs the joints be carried out.
Technical indicators
The application of steel sleeve grouting connection technology must meet the current national standards "Technical Regulations for Prefabricated Concrete" JGJ1, "Technical Regulations for the Application of Steel Sleeve Grouting Connections" JGJ355 and Relevant provisions of "Technical Standard for Prefabricated Concrete Buildings" GB/T51231. The force transmission mechanism of steel sleeve grouting connections is more complex than traditional mechanical connections. "Technical Regulations for the Application of Steel Sleeve Grouting Connections" JGJ355 has special requirements for the performance, type inspection, process inspection, construction and acceptance of steel sleeve grouting connection joints. .
Grouting sleeves are divided into cast grouting sleeves and machined grouting sleeves according to processing methods. The cast grouting sleeve should be made of ductile iron, and the machining sleeve should be made of high-quality carbon structural steel, low-alloy high-strength structural steel, alloy structural steel or other steel materials that have been determined to meet the requirements after joint type inspection.
The design, production and manufacturing of grouting sleeves should comply with the relevant provisions of the current industry standard "Grouting Sleeves for Reinforcement Bar Connections" JG/T398, and the special cement-based grouting materials should comply with the current industry standards "Grouting Sleeves for Reinforcement Bar Connections" Sleeve grouting material" various requirements of JG/T408. When grouting sleeves made of other materials are used, the performance indicators of the sleeves should comply with the relevant product standards.
The main performance indicators of the sleeve material: the tensile strength of the ductile iron grouting sleeve is not less than 550MPa, the elongation after break is not less than 5, and the spheroidization rate is not less than 85; the tensile strength of various steel grouting sleeves The tensile strength is not less than 600MPa, the yield strength is not less than 355MPa, and the elongation after break is not less than 16; other material sleeves meet the requirements of relevant product standards.
The main performance indicators of the grouting material: the initial fluidity is not less than 300mm, the 30min fluidity is not less than 260mm, the 1d compressive strength is not less than 35MPa, and the 28d compressive strength is not less than 85MPa.
When the sleeve material meets the requirements of indicators such as elongation after break, materials with a tensile strength exceeding 600MPa (such as 900MPa, 1000MPa) can be used to reduce the sleeve wall thickness and outer diameter. , other strength steels can also be used according to the production process. When the grouting material meets the requirements of fluidity and other indicators, materials with a compressive strength exceeding 85MPa (such as 110MPa, 130MPa) can be used to facilitate the connection of large-diameter steel bars, high-strength steel bars and shorten the length of the grouting sleeve.
Scope of application
This technology is suitable for the connection of HRB400 and HRB500 steel bars with a diameter of 12~40mm in assembled monolithic concrete structures, including: the longitudinal stress of prefabricated frame columns and prefabricated beams The connection of steel bars, vertical steel bars of prefabricated shear walls, etc. can also be used to connect the vertical and horizontal steel bars of cast-in-place structures in the renovation of existing structures.
Project Cases
Beijing Changyang Peninsula, Ziyun Home, Changyang Tiandi, Jinyu Washington, Shenyang Chunheli, Shenyang 12th National Games Security Center, Nanke Fortune Building, China Resources Ziyun Mansion, Vanke Tiexi Blue Mountain, Changchun FAW Technology Center Parking Building, Dalian Vanke City, Nanjing Shangfang Youth Apartment, Vanke Jiudu Hui, Hefei Shushan Phase 4 public rental housing, Luyang Lakeside New City, Shanghai Shebei large residential community, Qingpu New Town, Pudong New Area Minle large residential community, Longxin Senior Apartments, Longxin Plaza, Zhongnan Century City, Chengdu Jinfeng New Town, Xi'an Xingsheng Home, Urumqi Longxi Garden, Fujian Jianchao Industrial Building, etc.
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