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The advantages of wrapped steel reinforcement and its main points

Mar. 10, 2020

 Wrapped steel reinforcement is a relatively traditional method of reinforcement. The principle is to fix the steel plate to the load-bearing structure through epoxy structural glue and bolts to achieve the principle of common stress.  Now that there are many ways to strengthen, why is wrapped steel reinforcement still important? It shows that the reinforcement of Wrapped Steel still has its advantages. Let's analyze it for everyone.


Wrapped steel refers to sticky angle steel, which is generally used to strengthen columns.  Generally, you can wrap the four corners of the pillar. It has the low cost of reinforcement, simple and recognized construction operation, introduction of pillar-clad steel reinforcement construction.

 1. Drilling

 Drill the fixing bolt holes in the steel plate, hold the steel plate close to the bonding surface, and drill the fixing bolt holes in the corresponding position on the concrete. The position of the fixing holes in the concrete can also be determined by lofting.

2. Surface treatment

 The steel plate should be rusted and ground, and the concrete bonding surface must be ground or roughened. The edges and corners of the concrete section of the original component shall be rounded and polished, and the rounded concrete surface shall be free of loose aggregate and dust.

 3.Fixing steel plate

 The installation of the outer-bonded steel skeleton should be on a leveling surface, and small gaskets should be pasted at a certain distance to leave a gap between the steel skeleton and the original component in order to push into the glue.

4.Sealing and venting settings

 When sealing the seam, keep the injection channel open, and at the same time drill holes at the specified position, paste the base of the injection nozzle, and arrange exhaust holes in appropriate places.  After the sealant is cured, a pressure test is performed. If leaks are found, they should be resealed.

 5.Gluing and filling

 Weigh the two components A and B according to the recommended ratio and stir them evenly. The glue should be injected from one end. When there is glue flowing out of the exhaust hole, it should be sealed. Don’t be too fast, which prevents the formation of air bags.

6. Curing and maintenance 

 At room temperature, after the completion of the injection construction, it is left to stand for 72 hours for curing and maintenance. When the temperature decreases, the time is appropriately extended.

 7. Inspection

 Check whether there is any leakage around the steel plate, and check the effective bonding area of the steel plate with a small hammer. Need to fill the solid area can be filled with plastic injection holes and exhaust holes for refilling.

 8. Anticorrosive treatment

 The surface of the section steel (including the concrete surface) should be coated with a high-strength grade cement mortar with a thickness of not less than 25mm (steel wire mesh should be added to prevent cracking) as a protective layer, and other decorative materials with anti-corrosion and fire resistance properties can also be used for protection.


Due to the welding of wrapped steel reinforcement, the requirements for epoxy structural adhesive are relatively high. The adhesive used for Wrapped Steel reinforcement must be a high temperature infusion type adhesive.  Nanjing Mankate's sticky steel adhesive has been resistant to moisture and heat for 50 years. The strengthening environment of structures such as beams is generally humid. In order not to affect the reinforcement of Wrapped Steel, we must choose to one kind which can resist moisture and heat aging. Nanjing Mankate’s adhesive is very suitable. One-stop service hotline of Mankate: 400-894-5118

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 (Editor: Nanjing Mankate, if you need to reprint, please indicate the source)