The Maurer expansion joint is a steel-rubber composite type of bridge expansion joint. Due to its relatively low cost, excellent performance, strong bearing capacity, good anti-aging performance, low noise during vehicle travel, long service life, and simple maintenance, it has been widely used in bridge engineering in China. So, what are the issues that should be paid attention to during the installation of the Maurer expansion joint? Let's take a look.

1) Ensure the correct height of the position. To ensure the correct height and midline position of the Maurer device, place a horizontal hanging beam every 1.2m along the width of the bridge. After confirming that there is no deformation or deviation during the temporary fixation process, weld the anchor bars on both sides of the expansion device to the embedded bars securely.

2) The joints shall be tightly sealed. After welding, to prevent concrete and debris from falling into the joints, foam boards shall be used to tightly fill the joints to prevent leakage. The width of the filled joint shall ensure the minimum width specified for the expansion joint design. Subsequently, the slot opening shall be rinsed with a high-pressure water tap to clean out any debris.

3) Weld quality. To ensure the installation quality of expansion joints and guarantee their sufficient durability, the total tensile force of the welding between the anchor rod and the embedded parts at the beam end must be consistent with the total tensile force of the welding between the anchor rod and the expansion joint steel. It must be ensured that after removing the locking steel plate, the expansion joint assembly can absorb structural displacement without damaging the solidification of the concrete poured in the slot.

4) Symmetrically pour concrete. The formwork support must be firm to ensure that the concrete does not shift or leak during vibration, and to guarantee the performance of the expansion joints. Pour concrete symmetrically according to the design grade, paying particular attention to the compactness of the concrete under the expansion joint edge beams, anchor rings, anchor plates, and the lower part of the support box. It is advisable to use small stone concrete under the support box, and the curing period should not be less than two weeks.

5) Closed construction. To prevent damage to the Maurer expansion joints from passing vehicles and pedestrians, closed construction should be adopted. Only when the concrete strength of the last expansion joint reaches 100% can traffic be reopened, and then the installation of Maurer expansion joints for the other half of the bridge can proceed.