Expansion joints are inserted into concrete to prevent wide cracks from forming due to temperature changes. When concrete is enclosed in an area with a high temperature, it expands, which causes cracks. Slabs, pavements, buildings, bridges, walkways, railroad lines, piping systems, ships – You name it! Everything has expansion joints.
Connolly Expansion Joints: What Are They?
Well, formally the Connolly Expansion Joint system is a complete system for concrete jointing that allows a continuous pour solution for slab-on-ground installations. The systems offer a dowel join between to pours and allow a stop end pour to be conducted on site. Due to their straight profile, the dowels become the only point of contact for the load, allowing for movement.
Roll-formed galvanized steel sections with 10mm cross-linked foam are used in Connolly Expansion Joints that permit the joint expansion. A standard Connolly System uses a peg and wedge technique to fix alterations in joint set-up.
What are the Benefits of Connolly Expansion Joints?
- Up to 10 mm of expansion is permitted. (Danterr has a solution for joints higher than
- Four different profile heights are available.
- Accurate height adjustment.
- Twist-fix feature
- Additional hardening ribs ensure straighter joints.
- Galvanized coating to prevent corrosion
Why is adding expansion joints in concrete crucial?
Because concrete is not an elastic material, it cannot be bent or stretched without breaking. However, concrete expands and contracts, resulting in the structural components moving somewhat or somehow. Numerous expansion joints, such as foundations, walls, roof expansion joints, and paving slabs, are integrated into concrete construction to reduce negative consequences caused by concrete movement.
These joints require considerable planning in their installation, placement, and design. A slab will need an expansion joint to decrease strains if placed constantly on surfaces with more than one face. The holes left by cracks can be filled using a concrete sealer.
Expansion joints are made to bear the pressure of rigid pipes while remaining flexible and absorbing alignment errors brought about by these systems. There are restrictions on the amount of flexibility that can be absorbed before harm is done.
The amount of movement that can be absorbed throughout the system’s operational duration will be reduced if this flexibility is used to join two improperly aligned pipe flanges.
Custom Expansion Joints
At Danterr we understand that custom key joints are more appropriate for some projects. This is why we offer the option to change to a custom key joint and are happy to work with your team in achieving the right product for your project. Below we will look at some of the benefits of choosing a custom system.
Long-term reliability is offered by specially built expansion joints that can be oriented in various ways. To minimize overexertion, expansion joints are constructed frequently to link nonstandard distances between pipe flanges. Pipe flanges that are no longer centered can be connected. Danterr joints are available in a variety of finishes, each of which can be custom-designed to fulfil your requirements and best serve your project.
Expansion joints carry out several functions. Custom/Connolly joints are perfect for control of pressure and vibration while and allowing for flexibility at the seams. These goals can be more effectively achieved with an expansion joint designed for the location.
Custom expansion joints are an easier option for site installation when the joint requires a 200mm or higher joint. Custom joints can hasten installation and improve facility efficiency.
Sydney Light Rail Project is a great example of where Danterr supplied custom expansion joints to make it easier when laying the joints on the tracks, making the movement of the light rail smoother.
Transverse key joints were also supplied to the project. These key joints were used because linkages are made in continuous concrete pours using transverse key joints. With the ability to expand, joints access strength from a rigid steel backing profile (if required). This full depth straight joint was intentionally constructed using a doweling system to permit load transfer through a finished slab.