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Expansion Joint More Areas Of Application
Oct 26, 2017

One) The bridge expansion joint is not connected

1. Phenomenon: The expansion joint between abutment and the end of the beam and the joint (a few holes in the continuous bridge is called-union). Often occurs bridge abutment flank wall and ground fu, anti-collision guardrail. Railings in the expansion joints continue to open the common problems.

2. Hazard: Because the expansion joints are not fully connected. The fracture of the abutment wall, the ground fu, the anti-collision guardrail and the handrail of the railing are caused.

3. Reason analysis: After the completion of the superstructure of the main bridge. The construction of ancillary facilities. Technical disclosure did not put forward seam requirements, or construction operators do not understand the role of expansion joints, resulting in the above problems.

4. Preventive measures:

(1) The construction of ancillary structures, technical disclosure should be emphasized in the bridge deck expansion joints, to be completely disconnected. So that the expansion of the bridge across the transverse.

(2) Improve the technical quality of operators.

(3) in the construction of accessory structures, we should pay attention to the inspection of whether the expansion joints run through.

5. Treatment method: Can be in the area of abutment flank wall and ground fu, the railings for local rework. Leave out the transfixion seam.

Defect of installation and use quality of expansion joints

1. Phenomenon:

(1) The guide sink falls off under the expansion joint.

(2) The expansion of the tooth-shaped plate, the rubber joints of the embedded parts of the elevation of the design requirements.

(3) The main girder embedded steel bar and joint angle steel and the bottom plate welding is not secure and welding deformation.

(4) The concrete of the expansion joint is broken, which causes the expansion joint to be taken off anchor.

2. Hazard: The guide sink shedding causes leakage in the expansion joints, the installation elevation does not conform to the welding deformation. Causes the expansion joint and the bridge deck irregularity, produces jumps the vehicle, welds is not secure, the seam side concrete protection belt breakage causes the telescopic device premature damage.

3. Reason Analysis:

(1) Guide water U-shaped groove anchor, sticky, resulting in the guide sink fall off.

(2) the anchor plate of the expansion joint of the tooth shape plate. The connection angle of the slide expansion joint, the connection beam of the rubber expansion joint and the main beam pre-buried parts are welded before the elevation is verified.

(3) The welding parts of the expansion joint are not rust-removing, and the length and height of welding seam are not enough when welding. Welding is not secure, welding is not welded, resulting in large deformation.

(4) concrete protection belt without expansion concrete pouring, vibration is not dense.

4. Control methods:

(1) Take effective measures to anchor or paste the U-shaped groove of the guide water.

(2) The surface of the welding parts completely derusting, spot welding spacing is not less than 50cm, control welding temperature +5℃, ~+30℃ between, strengthen welding to double-sided welding, skip welding, finally plug hole welding, to ensure that welding deformation small, high welding strength.

(3) in the main beam embedded parts welded anchor plate, connecting angle steel, connecting beam steel parts, to keep both sides of the seam high. And the top elevation accords with the elevation of the point of the bridge.