Mr. Kamalakkannan. T, Founder of Unitech Structural Systems Pvt Ltd (USSPL), in capacity of M.D., explains that we are a Two and Half Decade old ISO 9001 certified company. which has excellent technical and commercial exposure. 50% of the group turnover comes from sales in overseas markets which proves the consistent quality consciousness of the management. Having track record of over 1000 sites Completed and 100 on-going all-over India with reputed clientele.

In this edition of Building & Construction Update, India’s best Magazine for Building and Construction & Infrastructure Industry we are covering our products related to Structural Joints and its solutions. The group is Professionally Managed Technocast Foundry Group which is ISO 9001/TS 16949 certified. The group has over 25 years of experience in the mechanical engineering industry catering to Construction Sector to different parts of the world.

Unitech Structural Systems Pvt Ltd (USSPL)is in the Field of:

• Movement Joints: approx. 3000 RM/Month of Single Seal and 500 RM/Month of Modular Joint. in Each Plant Coimbatore / Bhopal.
• Steel Bearings: approx. 1000 Nos./Month Bearings of each type (Pot / Spherical / Rocker roller) in Each Plant Coimbatore / Bhopal.
• Rubber Bearings: approx. 1000 Nos./Month Bearings, (Plain / With Plate / RDSO) in Each Plant Coimbatore / Bhopal.

Our Infrastructure:

Our Manufacturing Facility:

Bridge expansion joints are designed to allow for continuous traffic between structures while accommodating movement, shrinkage, and temperature variations on reinforced and pre-stressed concrete, composite, and steel structures. They stop the bridge from bending out of place in extreme conditions, and also allow enough vertical movement to permit bearing replacement without the need to dismantle the bridge expansion joint. There are various types, which can accommodate movement from 30 to > 3,000 millimetres. They include joints for small movement, medium movement, large movement or mega movements.

Why do we need joints?
Bridge deck joints allow a bridge to expand and contract due to a number of factors such as: temperature changes, deflections caused by live loads, creep and shrinkage of concrete etc.
Bridge deck joints are a necessary component of a properly designed and functioning structure.

Types of Structural Joints:

• Buried Joints (up to 10 mm Movement).
• Asphaltic Plug Joints (up to 25 mm Movement).
• Compression Seal Joints (up to 40 mm Movement).
• Strip Seal Joints (up to 80 mm Movement).
• Modular Strip Seal Joints (Over 80 mm Movement).
• Finger Joints (Over 80 mm Movement).
• Other Joints (Railway Projects).

Strip Seal Expansion Joints for Structures :
Single Strip Seal Expansion Joint (Monolithic) consist of two edge beams with anchorage and elastomeric seal held firmly in the housing of edge are beam that guarantee water tightness. Joints Suitable for movement up to 80 mm only. The Joints are water tight & Seal is mechanically locked in the edge beam.

Modular Expansion Joints for Structures :
The modular strip/box seal expansion joint divides the total movement capacity into several smaller gaps. The joint consists of two edge beams, one or more central/separation beams or lamellas oriented transversely to the traffic direction forming the load carrying elements, and cross beams supporting individual or multiple central beams to transfer the loads to the bridge deck through the anchorage system. Centre beams and transverse support/cross beams are connected by resilient or shock absorption system to dampen dynamic loading, thus reducing the forces transmitted to the structure and anchorages. The shock absorption system accommodates vertical and transverse movements apart from longitudinal movement. The joint also contains gap control system, which allows closing and opening of the joint and ensures that all modules open or close equally. The joint is made watertight through mechanically locked sealing system of elastomeric strip seals connected between the lamellas. The gap width between the consecutive centre beams at the joint surface shall be limited to 80 mm when the joint opens fully due to maximum contraction of deck.

Unitech Structural Systems Pvt. Ltd.
Mob : +91 97863 42000
Email : md@unitechcouplers.com
Web : www.unitechss.com