(1) Check whether the scale soil and elevation cross slope of the basement plane meet the design drawings and specifications.

(2) putright the road centerline and leveling points, establish the plane position and elevation control network, and protect the control points.

(3) Based on the center line of the pavement, the position lines of longitudinal joints are set out one by one at the grass-roots level with theodolite according to the design drawings. Ink lines should pop up when paying off, and then measure the horizontal joints. At the position of transverse joints, control points are set on the roadside every 20 ~ 30m, and concrete protection control points can be used as the basis for transverse contraction joint cutting after concrete pouring.

(4) Elevation measurement and control: According to the formwork support progress, the day before formwork support, steel bars are driven at the intersection of longitudinal and transverse joints, and the steel bars are more than 30cm higher than the subgrade surface.

Calculate the pavement design elevation of each steel brazing point according to the road longitudinal section design drawing, mark the elevation on the steel brazing with red lead oil, and make records as the basis for retest. After shuttering is completed, before concrete pouring, the straightness of the formwork shall be re-measured with theodolite and small white line respectively, and the elevation of the top surface of the formwork shall be detected with level.

(5) Control of transverse contraction joint cutting: after 24 hours of concrete pouring, contraction joint cutting can be carried out. Before cutting, the cutting seam should be played in advance as the basis of cutting machine guidance.

2, template production.

The combined formwork can be processed by welding the upper and lower channel steel. Make roadside formwork to solve the problems of vertical straightness, vertical facade and flat top surface. At the same time, the gap between two transverse steel bars can also fix the installation position of the pull rod. The model of channel steel can be determined according to the pavement thickness, the diameter of tie rod and dowel bar, and generally it should be smaller than the pavement design thickness 1cm, which can not only prevent the pavement base from being too high locally, but also facilitate formwork removal.

There is a through seam between the upper and lower section steel, and the through seam is blocked with wooden strips to solve the installation of the pull rod and the transverse dowel bar. Steel welded joints must be polished to ensure that the steel facade is flat and smooth.

3. Template installation.

(1) formwork installation position: the formwork only needs to be installed on the longitudinal and transverse construction joints, that is, all formwork support positions in the transverse direction are construction joints, and the transverse joints need not be cut and caulked. It is only necessary to coat asphalt on the upper part after formwork removal, so that the secondary poured concrete is separated from the upper part of the original concrete by asphalt, and naturally contraction joints are formed. ?

(2) Formwork installation: according to the ink lines drawn on the surface of the pavement base, determine the transverse position of the formwork, and temporarily fix the formwork by using the elevation points of steel bars. 6cm×9cm horizontal wooden belt is used at the back of the formwork, and the horizontal wooden belt at the central reinforcement of two groups of formwork passes through the square wood of 10cm× 10cm with a wooden wedge.

The top of the formwork is connected with φ 6 steel bar by stud bolts, and the tightness is adjusted to adjust the straightness and verticality of the formwork. The elevation of the top surface of the formwork shall be adjusted with iron sheet and steel bar head. In the middle of the formwork, wood strips are used to block the joints, and tie rod holes are reserved. After installation and inspection, apply release agent. The formwork system is easy to disassemble and assemble, and can be recycled.

(3) Dismantle the formwork, which can be carried out after concrete pouring 12 hours. Remove supports, wooden wedges, bolts and steel drills, and loosen the formwork from the concrete with a sledgehammer. Don't damage the concrete edges and corners when dismantling the formwork. The formwork that is not easy to dismantle locally can be pulled outward by chain to avoid damaging the formed concrete. Clean up in time after formwork removal for reuse.

(4) The shuttering sequence is related to the arrangement of concrete pouring, and the construction method of shuttering and running water pouring concrete can be adopted. Its main feature is that the solidified concrete after pouring is used as a template, and a layer of rubber is laid on the surface of the concrete to walk the vibrating beam. In this way, whether there is formwork or not, it can be guaranteed that every shift is shuttering and pouring concrete, forming a flowing construction.

4. Set dowel bar and pull rod. When the cement concrete pavement is plain concrete, tie bars should be set at the longitudinal joints and dowel bars should be set at the transverse contraction joints. The dowel bar is set at each transverse joint, while the pull rod is only set at the designated longitudinal joint, and the installation must be synchronized with concrete pouring.

(1) Processing of pull rod and dowel bar. The design diameter of the tie rod is Ф16mm and the length is 80cm. The finished steel bars that have passed the inspection can be cut into 80cm long by the steel bar cutter, and the steel bar surface should be free of corrosion, and both ends should be flush and straight. The dowel bar is generally designed as round steel with a diameter of 32 mm and a length of 50 cm.

Qualified finished products shall be cut by grinding wheel cutting machine, and steel bar cutting machine or gas cutting machine shall not be used. After cutting, grind the tail thorn with a grinder and coat more than half of its length with hot asphalt. Install the plastic sleeve with the length of 10cm at the asphalt end of the expansion joint tie rod, and reserve a gap of 30mm, and fill in the yarn head in the gap.

(2) After the tie rod is installed and the formwork is accepted, when pouring concrete, each dowel bar should be installed quickly with concrete vibrating, and inserted for vibrating, and the straightness and exposed size should be adjusted in time. The leakage of individual holes should be blocked with materials in time.

(3) dowel bar installation, dowel bar set on each transverse contraction joint, construction joints should also be laid. During construction, the reinforced horse stool can be used for support and binding, so as to ensure accurate installation and save steel bars. A simple dowel bar installation frame can be processed, and two brackets need to be processed to be used in turn.

5, concrete pouring and vibrating.

(1) Before pouring concrete, check the formwork, draw a small line to check the straightness, use a level to detect the top elevation, and correct any deviation in time. Prepare tie rods, dowel bars and fixing frames before market opening.

(2) The concrete is vibrated, and the pavement concrete can be poured in two layers to prevent excessive lateral pressure and collapse of the side formwork. After the second layer of concrete is vibrated with a vibrating rod, it is vibrated with a vibrating beam. After the vibrating beam vibrates back and forth, the interior and surface of concrete have been vibrated and leveled.

At this time, the roller is rolled back and forth with a pulp lifting rod, and individual outstanding aggregates are pressed down, and the mortar is lifted to keep the surface mortar thickness at about 5 ~ 8 mm, which is beneficial to surface preparation. Finally, the roller is locked and leveled on the surface, so that the concrete can meet the requirements of pavement smoothness.

6, plaster, concrete pouring is completed, immediately with a grinder for rough dressing. Parts such as edges and corners that can't be polished by local polishers can be polished by miniature manual polishers, and protruding stones can be smoothed. Finally, you can use a ruler to check the smoothness of the road surface, and then use an iron trowel to polish it manually after it meets the requirements. Operators must wear flat-bottomed insulating shoes and insulating gloves to prevent electric leakage.

7. Close the surface, and conduct transverse texture treatment on the surface after plastering. Transverse texture includes groove pressing, napping, sawing and so on.

The expanded data conforms to the relevant provisions of Code for Planning and Design of Urban Road Traffic;

5.2. 1 When street trees, bus stops, bus shelters, telephone booths and other facilities are set along the sidewalk, the normal traffic of pedestrians shall not be hindered.

5.2.2 To determine the capacity of sidewalks, it should be calculated according to the actual net width of the passable pedestrian walkway.

5.2.3 The width of the sidewalk shall be calculated according to the multiple of the pedestrian zone, and the minimum width shall not be less than1.5m. The width and capacity of the pedestrian zone shall meet the following requirements. The width and maximum capacity of the pedestrian zone are converted as follows: 1. Pier, footbridge and underpass: width (m)0.90, maximum capacity (person /h) 1400 2. Urban road: width (m) 0.75, maximum capacity 1800 (person)

5.2.4 On the sections of urban main roads and secondary roads, the spacing between crosswalks or intersections should be 250-300m.

5.2.5 When the road width exceeds four motor vehicle lanes, pedestrian safety islands shall be set in the median of the roadway or the median between motor vehicle lanes and non-motor vehicle lanes. There is no legal width, only urban road design standards. Urban road design should be ahead of schedule, and future road capacity should be considered.

Baidu Encyclopedia-Road Engineering Construction

Baidu encyclopedia-pavement engineering

China Court Network-Road Traffic Safety Law of the People's Republic of China