First, the cement concrete plate size and seam design
⑴ plate size:
plate rectangular plate, plate width 4.5m, plate length 5.0m, gradient section plate shaped plate, the plate aspect ratio control between 1: 1 ~ 1: 1.3, see "Cement concrete pavement plate design diagram".
⑵ seam design
Expansion joints: Expansion joint width 20mm, seams set within the seam plate and sliding force rod, the seam plate foam rubber plate. In the road widening, both sides of the bridge and culvert vertical curve set at the bottom of expansion joints, a total of 73.
Longitudinal construction joints: Longitudinal construction joints shall be provided when the width of paved roads is less than the total width of roadways and hard shoulders. The construction shall adopt horizontal joint plus pull rod type and asphalt seam joint shall be applied to prevent seepage. When using sliding mode construction, Can be used paver lateral rod device inserted.
Horizontal shrinkage: According to the standard number of times the role of shaft load, the traffic of the section of the road is heavy traffic, therefore, all shrinkage are set dowel bar.
Lateral construction joints: located at the shrinkage at the use of flat seam plus transmission rod type, and in its joint surface coated asphalt, the expansion joint at its construction and expansion joints the same. Seams above the joints are made of polyurethane mastic.
Second, cement concrete pavement design
Drawbar: The vertical construction joint rod is made of 16mm diameter rebar with a length of 800mm and a spacing of 600mm. The transverse joint rod between the bridgehead and the reinforced concrete slab is made of 25mm diameter rebar with a length of 800mm and a spacing of 400mm. Pull the center of the rod within 100mm coated with rust paint, rod placed in the central plate thickness.
Force rod: the diameter of 32mm smooth steel, length 500mm, located in the center of the plate, the spacing 300mm, the outermost force rod away from the vertical construction joints or free edge of the distance of 150 ~ 250mm.
Bracket steel bar: power bar bracket steel bar with φ12 smooth, spacing 200mm.
In order to prevent the roadbed from being damaged due to uneven subgrade settlement, the entire transitional section should be demolished and the reinforced concrete pavement should be used. Horizontal reinforcement: φ8 smooth steel, spacing 25cm. Longitudinal reinforcement: φ8 glossy steel, spacing 10cm.