Usually when we talk about reinforcing structural adhesives, the most frequently mentioned are planting adhesives, potting adhesives and glued steel adhesives. However, there are actually several types of colloids in building reinforcement colloids. Although they have a single purpose, they can provide more convenient and better reinforcement for the structure. Let’s take a look at their uses and effects with Horse:

Special structural glue for bearing

The special structural glue for the cushion stone of the support is used for the structural glue of the cushion stone of the leveling support when the bridge jacking support is replaced, and the short-term strength increases rapidly.

A) Purpose of use

1. Ensure that the surface of the seat cushion is flat and not smooth

2. Make the top elevation of the supporting cushion stone accurate and consistent

3. Make the lower bearing surface of the support completely fall on the cushion stone of the support

4. Eliminate the phenomenon of local edge voids

5. Through leveling, the cushion stones at both ends of the same beam and the top surface of the cushion stones on the same bridge pier or abutment should be in the same elevation horizontal plane.

6. Avoid bias

7. Avoid initial shear and uneven force

Two) scope of application

It is mainly used for the rapid repair and leveling of the top surfaces of original bridge piers, piers, cap beams or the tops of bridge piers (abutments) that were chiseled out for jacking.

Three) Advantages and disadvantages compared with traditional repair paste

1. Repair strength

Replacement of structural rubber for bearings: short-term strength growth is fast

It has excellent curing performance and rapid short-term strength growth, which reduces the time for the support of the bridge after the bridge is lifted, and greatly improves the construction efficiency and equipment turnover.

Repair slurry: short-term strength growth rate is slow

The traditional repair mortar, which was simply the repair of concrete damage in the past, is now slowly developed and applied to the reinforcement of concrete structures and cement products.

2. Construction time

Replacement of structural glue for support: short construction time

Mix the glue according to the ratio and mix evenly, which greatly saves construction time

Repair slurry: long construction time

After weighing according to the proportion, add it to a clean spare bucket, mix well, add appropriate amount of water to adjust and mix well, add it to the mortar concrete and mix it for use, it takes a long time

3. Construction quality and construction safety

Replacement of structural adhesive for the support: The support is an important structural part of the upper structure and the lower structure. The replacement of the structural adhesive for the support is dedicated for special rubber, which is safer.

Repairing paste: the more traditional repairing method, can not be used for special glue

Four) The process of replacing the leveling glue on the support

1. Surface cleaning and polishing. Remove the floating sand, oil and dirt on the surface of the bridge abutment, and then use an angle grinder to remove the surface layer of 1 to 2mm thick. After polishing, use compressed air to blow off the floating dust. Finally, wipe the surface with a cotton cloth dipped in acetone and keep it dry for later use.

2. With glue. Weigh the A and B components of the glue according to the specified glue ratio, take an appropriate amount of glue, put the A group into a clean and dry container, and then add the B component in proportion, and stir evenly in the clean container with a putty knife ( It is best to stir in the same direction when stirring, try to avoid mixing with air to form bubbles), until the color is completely uniform. The weight ratio of glue is A:B=20:1. The amount of glue each time should not be too large, because the curing time is extremely fast, so the amount of glue each time should be used up within the operable time to avoid waste.

3. Repair and leveling. Apply the mixed glue to the recessed part on the surface of the cushion stone of the support, replace the configured HM-Q20D support with the special repair glue, use a putty knife to insert and scrape to repair and fill, reduce the height difference as much as possible, and measure it with the instrument , The top surface of the cushion stone on the same bridge pier or abutment should be in the horizontal plane of the same elevation.

4. Curing. The glue must be cured (the curing time depends on the on-site temperature, generally not less than 2 hours at 25°C) before the jack placement and other construction procedures can be carried out.