Flat Dumbbell Waterstop

Description

Flat Dumbbell Waterstop

The flat dumbbell wall waterstop is produced as ribbed on both sides and its edges are in the form of a circle (dumbbell) and it is connected to the reinforcement structure by the waterstop clamp.

properties and effects

• Duration of performance is equal to the life of the structure
• Ability to resist acids and alkalis
• High flexibility in length and width

Application

• Preventing the passage of water in the operational and expansion joints of structures
• Sealing artificial pools and lakes
• Sealing hydraulic structures

packing : 

Name	thickness	paking
EF Waterstop 30	5	25 meter roll

 

Flat Dumbbell Waterstop – Dual-Ribbed Waterproofing Solution for Structural Joints

The Flat Dumbbell Waterstop is a high-performance, thermoplastic sealing strip designed for use in construction and expansion joints of concrete structures exposed to water, liquids, and varying environmental conditions. Manufactured with ribbed surfaces on both sides and circular cross-section edges (resembling a dumbbell shape), this waterstop provides superior mechanical anchorage and watertight protection when cast into concrete.

This type of waterstop is especially suited for vertical wall joints and is typically connected to the steel reinforcement using dedicated waterstop clamps or ties, ensuring secure and accurate placement during concrete pouring.

Properties and Technical Advantages

• Structure-Long Service Life: The Flat Dumbbell Waterstop is engineered to maintain its sealing integrity throughout the entire service life of the concrete structure, offering a maintenance-free, permanent solution.
• Chemical Resistance: Its composition offers strong resistance against acids, alkalis, chlorides, sulfates, and other chemically aggressive substances commonly found in wastewater treatment plants, industrial sites, and underground utilities.
• Superior Flexibility and Elasticity: High elongation properties in both length and width directions allow the waterstop to absorb concrete shrinkage, expansion, and structural movements without compromising its seal.
• Enhanced Ribbed Design: The ribbed surface on both sides enhances mechanical bonding with concrete, creating a strong physical barrier that resists hydrostatic pressure from both sides.
• Temperature and UV Stability: Designed to withstand extreme environmental conditions, the dumbbell waterstop performs reliably under sub-zero and high-temperature fluctuations and retains UV stability when exposed to sunlight before installation.
• Versatile Form Factor: The dumbbell-shaped center provides a natural expansion buffer, allowing joint movement while maintaining watertightness, making it ideal for dynamic joint conditions.

Applications of Flat Dumbbell Waterstop

The Flat Dumbbell Waterstop is widely used in critical infrastructure where water ingress prevention and long-term durability are essential. Typical applications include:

• Sealing of Operational and Expansion Joints: Provides a watertight seal in both static and dynamic joints, ensuring integrity in construction joints, expansion gaps, and control joints within concrete elements.
• Artificial Pools and Ornamental Lakes: Ideal for decorative and recreational water bodies, where preventing leakage is vital to maintaining aesthetics and functionality.
• Hydraulic Structures: Including dams, reservoirs, water tanks, spillways, and channels, where waterstop performance is directly related to structural reliability and public safety.
• Underground Concrete Structures: Such as subway systems, tunnels, basement walls, and retaining walls, where consistent sealing against groundwater is a necessity.
• Sewage Systems and Water Treatment Plants: Where chemical resistance and sealing performance under pressure and exposure are critical.

Installation Guidelines and Best Practices

Proper installation is key to maximizing the performance of dumbbell-type waterstops:

• Positioning: The waterstop should be positioned precisely at the center of the joint, secured with tie wires to adjacent reinforcement to prevent movement during the concrete pour.
• Jointing and Welding: Sections of waterstop should be joined using thermal welding (hot blade or hot air) to ensure a seamless, leak-proof connection between lengths. Miter joints, T-joints, and cross joints must be carefully executed using factory-approved methods.
• Concrete Compaction: Adequate concrete vibration around the waterstop is essential to eliminate air pockets and achieve full encapsulation, which ensures watertight performance and durability.

Why Choose Flat Dumbbell Waterstop?

The Flat Dumbbell Waterstop offers a perfect balance between flexibility, chemical resistance, and mechanical sealing efficiency. Key benefits include:

• Exceptional performance under hydrostatic pressure
• Ability to accommodate both thermal movement and structural settlement
• Simple and secure installation using clamping and welding
• Long-term sealing solution without maintenance requirements
• Compliant with international standards for concrete joint waterproofing

It is the preferred choice for engineers and contractors working on infrastructure, utilities, water features, and industrial projects where waterproofing reliability cannot be compromised.

Technical Specifications and Packaging

Name	Thickness (mm)	Packaging
EF Waterstop 30	5	25-meter roll

Each roll is individually wrapped for protection against dust and moisture and labeled for traceability. Rolls can be custom-manufactured in different widths, thicknesses, or profiles based on specific project design or regional standards.

Conclusion

The Flat Dumbbell Waterstop is a critical component in the construction of waterproof concrete joints, combining mechanical strength with elasticity and chemical resistance. Its double-ribbed profile and dumbbell center make it a highly effective barrier against water migration in both vertical and horizontal joints. Designed for durability, it supports structural integrity, ensures safety, and offers peace of mind across a wide range of demanding construction environments.