Structure of bridge expansion joints

SQ type bridge expansion joint highway bridge expansion joint device adopts integral hot rolling16Mn profiled steelThe comprehensive technical performance and technical indicators of the expansion joint device of highway bridge have reached or exceeded the advanced level of similar products in the world. Highway bridge expansion joint device characteristics, low building height, domestic hot-rolled integral shaped steel height only 50mm, simple structure, easy installation, with obvious reliability, comfort and durability. The expansion joint device of highway bridge is suitable for all kinds of bridges with a thickness of the bridge deck pavement layer equal to or greater than 80mm and an expansion amount of less than or equal to 80mm, which is not only convenient for the replacement of the old bridge expansion device, but also can be used for the construction of new bridges. The technical requirements of the intermediate rubber sealing strip of the expansion joint device of the highway bridge are adoptedNeoprene(CR) The telescopic device of the sealing rubber belt is suitable for the temperature of -25°C-+60°C.

Structural requirements for expansion joints of SQ bridges:

It is required that the expansion joint can be freely expanded and contracted in both directions parallel and perpendicular to the bridge axis, firm and reliable, and the vehicle should be smooth when driving smoothly, without jumping and noise. it should be able to prevent rainwater and garbage and soil from seeping into and blocking; Installation, inspection, maintenance, and elimination of dirt should be simple and convenient. At the place where expansion joints are set, the railing and the bridge deck pavement must be disconnected.

SQ bridge expansion joint construction skills:

1. Usually we should check the size of the reserved groove according to the design before carrying out the construction of type 60 and 80 expansion joints, and clean the reserved groove. First of all, the white paint line should be elastic on the part of the bridge deck to be cut to ensure that the slotting joint is neat and straight, and for the deformed part of the pavement on both sides of the bridge deck system, the cutting width should be appropriately widened to ensure that the concrete and asphalt concrete joints are partially flat.Pre-embedded anchor barsIf it does not meet the design requirements, it must be dealt with first, and expansion joints can be installed only after meeting the design requirements.

2. Before installation, the expansion joint should be adjusted according to the actual temperature according to the calculation formula in the drawing design, and fixed with a special fixture. When cleaning the concrete and sandbags in the tank, pay attention to protecting the reserved steel bars in the tank to prevent the phenomenon of lack of steel bars.

3. During installation, the center line of the expansion joint and the center line of the bridge should coincide, and the top elevation should be consistent with the design elevation, and the cross slope and longitudinal slope should be consistent with the cross slope and longitudinal slope of the bridge deck.

4. After the correct position, then thread and place the horizontal connection horizontal steel bars, so that the anchor steel bars on the expansion joint and the embedded steel bars are welded firmly on both sides at the same time.

5. After completing the above process, pour concrete in the reserved notch, and take necessary measures to shake and compact the concrete. Concrete should not be splashed or filled in the seams and surfaces of sealed rubber belts during pouring, and if this phenomenon occurs, it should be done immediately. Maintenance is carried out after pouring.

6. After the strength of the concrete on both sides of the expansion joint meets the design requirements, it can be opened to traffic. The construction party should pay attention to the expansion joints of the bridge: the appearance of the special-shaped steel used in the expansion joints should be smooth and flat, and deformation and distortion are not allowed. The product must be assembled at the factory. Assembled steel components should be treated with effective protection. The lifting position application is obvious.