1, lofting

Before laying the sidewalk, according to the designed plane and elevation, measure the setting-out along the center line (or sideline) of the sidewalk, measure a brick as a control point every 5m~ 10m, and establish a grid to control the elevation and direction.

Step 2: mat

According to the position and elevation of survey lofting, carry out cushion construction. The pavement cushion adopts C 15 cm thick non-pumped commercial concrete cushion.

3. Block stone pavement

(1) Generally, the "pay-off and positioning method" is adopted for paving in turn, and the colored bricks should be close to the cushion, and there should be no "void" phenomenon.

(2) often use a three-meter ruler to measure the flatness of the surface along the longitudinal, transverse and oblique directions. If it is found that it does not meet the requirements, it will be repaired in time.

(3) Paving must be smooth and stable, with straight vertical and horizontal joints, neat rows and even gaps.

4, caulking and curing

After paving is completed, joint filling can only be carried out after inspection. Mix the sieved dry sand with cement and evenly fill the brick joints, sprinkle water on the brick surface to make the sand ash sink, and tick off the joints with cement mortar that meets the design requirements. The jointing must be completely hooked and pressed into the concave joint on the surface; After the mortar is solidified, it can only be used by sprinkling water for 7 days.

(2) Cement concrete pavement construction

1, construction lofting

Before construction, according to the design requirements, the temporary pile points set during the construction of water-stable layer are used to measure and set out, determine the plate position, divide the plates, conduct positioning control, and set control piles at each corner of the roadway for inspection and retest at any time.

2, shuttering

According to the vertical and horizontal elevation of concrete slab, the formwork adopts corresponding high steel formwork. Because the formwork is supported on the cement stabilized macadam layer, in order to facilitate the operation, firstly, an electric hammer is used to drill holes on the cement stabilized macadam layer, and the diameter and depth of the holes are slightly smaller than the supporting steel bars and supporting depth. Before formwork support, the steel formwork shall be drilled and numbered according to the setting requirements of longitudinal and transverse joint dowel bars, and formwork support shall be conducted in strict accordance with the numbering sequence. The hole position is slightly larger than the diameter of the designed dowel bar and pull rod, and the steel bar is installed. In order to avoid slurry leakage, elevation measurement should be carried out after formwork is supported to check whether it is firm, and release agent should be brushed before pouring cement concrete.

3, concrete mixing, transportation

For centralized mixing of concrete at the site, our company will design the test mix ratio in advance according to the design requirements, and require that the mixing ratio provided by the laboratory be accurately fed. Concrete is transported by concrete truck.

4, steel production and placement

Steel bars shall be processed and manufactured off-site according to the design requirements, transported to the site and poured before pouring cement concrete.

5. 1 rebar placement at the edge of free plate

The steel bars at the edge of the free plate should be placed at least 5cm away from the edge of the plate, supported by precast concrete blocks with a thickness of 4cm, and the spacing between blocks should not be greater than 80cm, and the spacing between two steel bars should not be less than 10cm. In the process of pouring concrete, the middle of the steel bar should be straight, without deformation and deflection, and prevent displacement.

5.2 corner reinforcement placement

When the concrete is cast to a difference of 5cm from the design thickness, the distance between the expansion joint and the edge of the slab is 10cm, and the upper concrete is cast after being tiled in place.

5.3 The anti-crack reinforcement of inspection wells and rain outlets shall be placed in the same way as the reinforcement on the edge of the free plate.

6, concrete paving, vibrating

Concrete paving should be carried out immediately after the reinforcement is in place, and the release agent should be brushed before paving to protect the reinforcement from moving or dislocation during paving. That is, after the concrete is spread to half thickness, it will be vibrated with a flat vibrator first, and then with a flat vibrator after preliminary leveling. When vibrating, the vibrator moves from the roadside to the pavement line by line in the longitudinal direction, and the overlapping surface before and after each plate movement is about 20cm (about 1/3 plate width), so as not to leak vibration. The vibration time of the vibrator at each position is generally 15s-25s, which should not be too long until the concrete mixture is submerged and the surface is uniform without obvious lumps or blisters. In places that cannot be vibrated, such as the edge of the formwork and near the water inlet, plug-in vibrators should be used for vibration. When vibrating, the vibrator should twitch vertically and slowly, and the distance between each movement should not be greater than 1.5 times the action radius. The spacing between the plug-in vibrator and the template is generally about 10cm. The plug-in vibrator does not vibrate on the dowel bar, so as not to damage the concrete at the edge of adjacent plates. The concrete surface leveled by flat vibrator is basically flat, and there is no obvious concave-convex trace. Then use vibration tamping template to tamp and level. When vibrating, put both ends of the vibrating rod template on the longitudinal templates on both sides, or on the poured cement slabs on both sides as the basis for controlling the pavement elevation. Vibrate twice from one end to the other.

7. Plastering and embossing

After the concrete slab is vibrated and compacted, the concrete surface shall be leveled with a trowel, and then it shall be leveled manually. For the last time, be careful, eliminate sand holes, and make the concrete surface meet the flatness requirements. After polishing, brush lightly along the cross slope with a combination brush to flatten the traces, and then emboss the concrete surface with a embossing machine. In order to ensure the uniform indentation depth and control the embossing operation time, the specifications can be mastered by using angle iron as a guide ruler according to the size of the embossing machine. During construction, the straightness of the guide rule should be checked frequently, and the deviation should be replaced in time.

8. Demolition

Be careful when ripping, and don't use a sledgehammer to knock, so as not to damage the corners. The ripping time should be within 36~48 hours after the final set of concrete, so as to avoid premature ripping and damage the concrete corners.

9. Expansion joint

The expansion joint plate is made of 2cm thick asphalt plate, and both sides are coated with 1-2mm asphalt, which is buried in the road surface. The height of the plate is consistent with the height of the road surface. Before filling asphalt mortar, cut 4-5cm from its upper part, and then fill asphalt mortar.

10, slotting

Shrinkage joints are cut by concrete cutting machine, with a depth of 5cm and a slice thickness of 3 mm, and the cutting is carried out after form removal. When the formwork is removed, the position mark of the contraction joint has been marked on the cement concrete block. If the transverse contraction joint (without dowel bar) is located at the inspection well and the rain mouth, the contraction joint position should be readjusted, and in principle, it should be controlled at a distance of more than 1.2m from the well position. Line drawing is required before cutting, and the line drawing should be aligned with the cutting line to ensure that the horizontal joints at the same pile position are straight and beautiful, and the depth is even when cutting.

1 1, joint filling

Expansion joints and contraction joints are poured with asphalt mortar. Clean up the dust and sundries in the joint before pouring, and pour after the joint is completely dry.

12, maintenance