Building expansion joints, also known as expansion joints, are construction seams placed at appropriate locations along the construction joints of buildings or structures to prevent cracking or damage to building components due to changes in climate and temperature (expansion from heat, contraction from cold). These joints divide building components above the foundation, such as walls, floor slabs, and roofs (excluding wooden roofs), into two separate parts, allowing for horizontal expansion along the length of the building or structure.

Building expansion joints allow for horizontal expansion along the length of the structure, 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 Construction

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 from the building foundation, which is buried underground and thus less affected by temperature changes, so no disconnection is necessary. 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 gap needs to be set at a certain length within the structure to divide the building into several parts, and this gap is known as a temperature joint. The distance between expansion joints varies depending on the structural system. Article 8.1 of the current Chinese standard "Code for Design of Concrete Structures" GB50010-2010 specifies this specifically.

GQF-C, GQF-Z, GQF-E, GQF-F, and GQF-MZL type expansion joints for bridges, all designed with extruded steel sections for thermal shaping. The GQF-C, GQF-Z, GQF-L, and GQF-F models are suitable for bridges with expansion up to 80mm. The GQF-MZL model consists of side beams, middle beams, cross beams, and a linkage mechanism, designed for expansion ranges of 80mm to 1200mm in medium to large span bridges.

To meet the requirements for bridge deck deformation, it is typically done between the ends of the beams, between the beam ends and the bridge abutments, or on the bridge itself.

Section 3: Construction Requirements (1) Free expansion and contraction in both directions parallel and perpendicular to the bridge's axis.

(2) Robust and reliable

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

(4) Waterproofing and Prevention of Debris Penetration and Clogging

(5) Installation, inspection, maintenance, and cleaning of debris should be simple and convenient