Expansion joints, also known as expansion seams, are construction joints installed at appropriate locations along the direction of the construction缝 of buildings or structures to prevent cracks or damage to the building components due to climatic temperature changes (expansion due to heat and contraction due to cold). These joints divide the building components above the foundation, such as walls, floors, and roofs (excluding wooden roofs), into two independent sections, allowing for horizontal expansion along the length of the building or structure.

Building expansion joints allow buildings to expand horizontally along their length, suitable for rooftops and above buildings. Type G: QF-C, GQF-Z, GQF-E, etc., other expansion joints are also known as temperature joints. Discipline classification: Architecture, Application field: Building Science.

One: The primary function is to prevent cracks in buildings due to climatic changes. The method is to leave gaps at certain intervals along the length of the building, completely disconnecting all above-ground components such as the roof, walls, and floors. The building foundation, being buried underground, is less affected by temperature changes and does not need to be disconnected. The width of expansion joints is generally 2 to 3 centimeters, filled with insulating material, and the spacing between the two expansion joints is clearly specified in the building structure regulations.

If the building plan size is too long, due to thermal expansion and contraction, it may cause excessive temperature stresses in the structure. Therefore, a gap needs to be set at certain lengths within the structure to divide the building into several sections, and this gap is referred to as a temperature joint. The distance between expansion joints varies depending on the structural system. Article 8.1 of the current Chinese specification "Code for Design of Concrete Structures" GB50010-2010 has a specific regulation on this matter.

Type Bridging Expansion Joints: GQF-C, GQF-Z, GQF-E, GQF-F, and GQF-MZL models, all are bridge expansion joints products designed with special-shaped steel bars that are hot-rolled and fully formed. The GQF-C, GQF-Z, GQF-L, and GQF-F expansion joints are suitable for bridges with expansion ranges under 80mm. The GQF-MZL expansion joint assembly is a modular design consisting of side beams, middle beams, cross beams, and linkage mechanisms, suitable for bridges with expansion ranges of 80mm to 1200mm in medium to large spans.

To meet the requirements of bridge surface deformation, it is usually placed between the ends of the two beams, between the beam ends and the bridge abutments, or on the bridge.

Section 3: Construction Requirements (1) The structure shall be freely expandable and contractible in both directions parallel and perpendicular to the bridge axis.

Robust and reliable

(3) The vehicle should run smoothly without any sudden jumps or noises.

(4) Waterproof and prevent debris from seeping in and causing blockage

(5) Installation, inspection, maintenance, and dirt removal should be simple and convenient