Building expansion joints, also known as expansion joints, are construction gaps strategically placed along the construction joints of buildings or structures to prevent cracks or damage due to climatic temperature changes (expansion in heat, contraction in cold). These joints divide building components above the foundation, such as walls, floors, and roofs (excluding wooden roofs), into two separate parts, allowing the structure to horizontally expand or contract along its length.

Building expansion joints allow buildings to horizontally expand along their length, suitable for rooftops and above buildings. Types: GQF-C type, GQF-Z type, GQF-E type, and other expansion joints, also known as temperature joints. Discipline classification: Architecture; Application field: Building engineering.

One: The primary function is to prevent cracks in buildings due to climatic changes. The method involves leaving gaps at regular 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 insulation material, and the spacing between the two expansion joints is clearly specified in the building structural regulations.

If the building's plan dimensions are too long, due to thermal expansion and contraction, it may cause excessive temperature stress within the structure. Therefore, a crack needs to be set at a certain length within the structure to divide the building into several parts, and this crack is known as a temperature joint. The distance between expansion joints varies depending on the type of structural system. Article 8.1 of the current Chinese standard "Code for Design of Concrete Structures" GB50010-2010 specifies this specifically.

Type Bridges Expansion Joints: GQF-C, GQF-Z, GQF-E, GQF-F, and GQF-MZL models, all are expansion joint products designed with atypical steel bars formed through hot rolling. The GQF-C, GQF-Z, GQF-L, and GQF-F expansion joints are suitable for bridges with expansion less than 80mm, while the GQF-MZL expansion joint is a modular design consisting of side beams, middle beams, cross beams, and a linkage mechanism, suitable for bridges with expansion from 80mm to 1200mm in medium to large spans.

To meet the requirements for bridge deck deformation, it is typically installed between the ends of the two beams, between the beam ends and the bridge abutment, or on the bridge.

Section 3: Construction Requirements:

(1) Free to expand and contract in both directions parallel and perpendicular to the bridge's axis

(2) Durable and reliable

(3) The vehicle should run smoothly without abrupt jumps or noise.

(4) Waterproofing and preventing debris from seeping in and causing blockages

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