D-120 and D-160 Expansion Joints: Processing, Installation, and Construction of Bridge Expansion Joints

I. Modular Expansion Joint Product Introduction

1. Definition and Purpose

Modular expansion joints are expansion devices used in bridges or building structures, primarily designed to address structural deformations caused by temperature changes, concrete shrinkage, and load effects, ensuring smooth traffic flow and structural safety.

2. Product Features

• Large Displacement Capacity: Suitable for large-span bridges with expansion ranges of 80mm to 1200mm.
• Modular Design: Composed of edge beams, center beams, support beams, D-120 and D-160 Expansion Joints: Processing, Installation, and Construction of Bridge Expansion Joints rubber sealing strips, etc., allowing flexible adjustment of modules.
• High Durability: Made of high-strength steel and aging-resistant rubber, offering impact resistance and wear resistance.
• Waterproof Performance: Multi-layer sealing design D-120 and D-160 Expansion Joints: Processing and Installation of Expansion Joints effectively prevents rainwater from penetrating the beam structure.

3. Main Types

• Special-Shaped Steel Modular Expansion Joints (e.g., SS, D-type, etc.).
• Multi-Directional Modular Expansion Joints (adaptable to complex displacement directions).

4. Applicable Scenarios

• Highways and railway bridges.
• Urban overpasses and large building structures.

II. Expansion Joint Installation and Construction Process

1. Pre-Construction Preparation

• Design Verification: Confirm that the expansion joint model, D-120 and D-160 Expansion Joints: Processing and Installation of Expansion Joints displacement capacity, and drawings are consistent.
• Base Trough Cleaning: Remove concrete from the reserved groove to the design elevation and clear debris.
• Embedded Parts Inspection: Ensure embedded reinforcement is accurately positioned and free from corrosion.

2. Installation Steps

1. Positioning and Welding

   • Hoist the expansion joint device into the groove, D-120 and D-160 Expansion Joints: Processing and Installation of Expansion Joints align the centerline with the bridge axis.
   • Weld and secure anchor bars to the embedded reinforcement (symmetrical welding is required to prevent deformation).

2. Elevation Adjustment

   • Use a level to ensure the top surface of the expansion joint aligns with the bridge deck pavement elevation, with an allowable deviation of ±1mm.

3. Concrete Pouring

   • After formwork setup, pour high-strength concrete (C50 or above) and compact it thoroughly.
   • Cover and cure for ≥7 days; no traffic is allowed until strength reaches 80%.

4. Rubber Strip Installation

   • After the concrete has cured, embed weather-resistant rubber sealing strips, ensuring no wrinkles or gaps.