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Bridge Expansion Joint, Highway Construction Deformation Joint, Comb Plate, Sidewalk Displacement Expansion Joint, Modular Device

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US$ 35 10 - 99 Meters
US$ 34 ≥100 Meters
Key Specifications
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Type:
Telescopic Device
Certification:
DIN
Warranty:
1 year
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Hengshui Haogu Engineering Materials Co., Ltd.
Gold Verified Supplier
1Yr
Verified Business License
Payment & Shipping
Payment Methods:
Port of Shipment:
Tianjin/Qingdao
Delivery Detail:
3 days

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Type Telescopic Device
Certification DIN
Warranty 1 year
Position Lower Structure
After-sales Service Provide on-site guidance
Function Other, Bridge expansion joint
Transport Package Wooden crate packaging
Specification Customized according to the drawing
Trademark HaoGu
Origin HeBei HengShui
Structure Composition and Purpose of Expansion Joints
Expansion joints are critical components widely used in civil engineering structures such as bridges, highways, and buildings. They are designed to address volume changes and displacements of structures caused by external factors. Below is a detailed introduction to their structure composition and purpose.
1. Structure Composition
The structure of expansion joints is designed to balance flexibility (for displacement) and stability (for load-bearing). Its core components include:
1.1 Expansion Device Body

  • Function: The core part that directly accommodates structural expansion, contraction, or lateral displacement.

  • Common Materials: Rubber (neoprene, EPDM for good elasticity and weather resistance), steel (for heavy-load scenarios like bridges), or composite materials (combining rubber’s flexibility and steel’s strength).

  • Typical Forms: Modular (for large displacement), strip-type (for small/medium displacement), or bridge-specific grid-type structures.3

1.2 Sealing Element

  • Function: Prevent water, debris, dust, and chemical impurities from infiltrating the joint gap, which could cause corrosion of internal steel bars or damage to the structure’s base.

  • Common Materials: Elastic rubber strips, foam rubber, or waterproof sealants (e.g., polyurethane sealants with strong adhesion).1

1.3 Anchoring System

  • Function: Fix the expansion device body to the main structure (e.g., bridge beam, building floor) to ensure the joint bears vertical and horizontal loads (such as vehicle weight, pedestrian pressure) without detachment.

  • Components: Anchoring bolts, steel plates, and embedded parts (pre-embedded in the structure during construction to connect with the expansion device).

1.4 Guiding Device (Optional)

  • Function: Control the direction of structural displacement (e.g., limit lateral deviation of bridges) to avoid misalignment of the expansion joint and ensure stable operation.

  • Common Form: Steel guide rails or rubber limit blocks.

    2

2. Purpose
Expansion joints play an irreplaceable role in protecting the safety and durability of structures. Their main purposes are:
2.1 Adapt to Thermal Expansion and Contraction
Structures (e.g., concrete, steel) expand when heated and contract when cooled. Expansion joints provide a "buffer space" to absorb these volume changes, preventing cracks, deformation, or even collapse of the structure.
2.2 Absorb Structural Settlement and Displacement
Uneven settlement of the ground (e.g., due to geological changes) or lateral displacement (e.g., bridge deflection under load) can cause internal stress in the structure. Expansion joints relieve this stress by allowing controlled displacement.
2.3 Prevent Impurity Infiltration and Corrosion
The sealing element blocks water, salt (for road/bridge de-icing), and debris from entering the joint. This avoids corrosion of steel reinforcement inside the structure and degradation of concrete, extending the structure’s service life.
2.4 Reduce Stress Concentration
Without expansion joints, local stress concentration (e.g., at the junction of bridge segments) would occur due to rigid constraints. Expansion joints disperse stress evenly, protecting the structure from fatigue damage.
2.5 Improve Service Safety and Comfort
For traffic structures (bridges, highways), well-designed expansion joints reduce vibration and noise caused by vehicle passage, improving driving comfort. They also prevent vehicle tires from getting stuck in gaps, ensuring traffic safety.


Product Tags: Bridge expansion join , idewalk displacement expansion joint , comb plate

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Hengshui Haogu Engineering Materials Co., Ltd.
Gold Verified Supplier
1Yr
Verified Business License
Year Established
2025
Factory Size
3,000-5,000 square meters
Annual Export Value
US$5 Million - US$10 Million
Total Employees
51 - 100 People
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