Structural Steel Tie Rod Project Introduction:
The construction project of Zunyi Science and Technology Museum has 3 floors, with a total construction area of 16598.58 m2 and a building height of 22.797m. The steel structure of the project includes steel columns, roofing steel truss, the steel structure of the exhibition hall at 12.45 meters, 80 structural steel tie rods on the exhibition ramp, an H-shaped steel beam, and a steel bridge of the ball screen film hall. A section steel column plane is divided into 10 points layout, divided into H section steel column, cross-section steel column.
Roof steel structure for large span cantilever which adopts truss structure. The trusses are divided into 3 parts, and each truss is provided with two supports (one end is sliding support, the other end is hinged support). A connection truss is arranged at the end of the main truss. The maximum cantilever length of the main truss is 18.395m, 20.825m and 12.082m. The chord of truss adopts a square steel pipe, and floor and roof board materials are steel and concrete. The third floor (12.45 meters in the exhibition hall) is hung with steel and concrete composite floor steel beam for hot-rolled H-beam. The large span of 28.8m is used above the ball screen cinema, and the steel beam is welded I-beam, which is supported on the surrounding frame column in the form of hinge. Walking ramp (ramp I and ramp) leading to the exhibition hall on the third floor, it has a span of 27.8m and is supported on the frame column on one side, and it is suspended from the steel structure roof on the other side by 80 structural tie rods. Large span, large overhang, and combination with concrete structure make the construction with steel structural tie rod more difficult.
Structural Steel Tie Rods with Upset and Rolled Threads EAU 2014
|Area, Core Diameter||As||[mm²]||976||1121||1306||1473||1758||2030||2361|
The high strength hot-rolled structural Steel tie rod used in Zunyi Science and Technology Museum has a diameter of 80mm, a length of 1L643m, 1L323m, and 1L418m, respectively, and tensile strength of not less than 650MPa. Three side-by-side and vertically connect the main box girder on the upper chord of ramp 1, ramp 3 and roof steel truss. High strength structural tie rod accessories mainly include: pull rod, adjusting sleeve (positive and negative screw), nut, backing plate, temporary U joint, etc.
Keys of Structural Steel Tie Rod Construction
- Single structural steel tie rod with a length of more than 11 meters passes through 3 reserved holes, and the upper and lower openings of reserved holes need to be installed with double nuts.
- The solution of construction problem is the prerequisite for structual tie rod construction to meet the design requirements.
- The concrete contact surface flatness between the backing plate and ramp inclined beam, and the included Angle between the nut and backing iron.
- During the assembly process, the structural steel tie rod surface coating treatment and thread protection.
- The sealing anticorrosion at the threaded joints of high strength structural tie rods should be given priority treatment.
Structural Steel Tie Rod Surface Treatment
This process is the key to ensure that the anti-corrosion life of the structural steel tie rod reaches the design requirements, and also directly affects the safety and stability of the whole structure. Before painting, the surface of the structural tie rod must be thoroughly cleaned of burrs, welding slag, spatters, dust accumulation, rust, oxide scale, oil stains and attachments. Due to the difficult surface shot peening, it is difficult to reach SA2.5 in a conventional way, so the mechanical sandblasting method is used for thorough dusting. The structural steel tie rod shall be coated with a water-borne inorganic zinc-rich primer except for the threaded connection part. The intermediate paint and top paint shall be the same. The primer shall be compatible with fireproof coating, and the paint shall have good adhesion to the substrate. The dry film thickness of each coat: 10 m primer, 100 m intermediate coat.
Before structural steel tie rod construction, it is necessary to coordinate with all departments to work on synchronously tracking, measuring, and controlling the embedded casing pipe, the position of the structural tie rod, ramp beam and the elevation of the top chord of truss.
Flatness Control of Structural Tie Rod Contact Surface
The contact surface is small. Place the level (without support) on the contact surface of an inclined beam of the ramp, rotate the level constantly to judge the flatness, and polish the uneven contact surface with the polishing equipment to ensure the flatness of the contact surface and ensure that there is no angle between the contact surface of the ramp and the inclined beam. If you are interested in other high strength steel rod products, contact us now for more details and the latest price!