2) Track measurement and control of paver: Surveyors shall conduct track positioning and elevation measurement of paver on the top of anti-collision guardrail or beam top.
The elevation of the cast iron pipe shall be strictly controlled.
Standards and specifications are mainly applied.
3.3.3 Reinforcement mesh or ordinary reinforcement shall be used.
If a suspended paver is used, the paver track can be made of channel steel.
The bridge floor reinforcement mesh is cold-rolled ribbed reinforcement welded mesh or bound reinforcement mesh.
The paving surface shall be evenly distributed manually.
The spacing shall be strictly in accordance with the requirements of the drawings.
shall be inspected according to the specified inspection frequency to ensure that all raw materials are qualified before use.
3.4.4 The construction scheme and divisional commencement report have been approved.
During construction, according to the measurement data and the height from the paver track to the bottom of the roller shaft, adjust the track elevation to ensure that the top surface elevation of the pavement meets the design requirements.
Excess concrete on the paving surface shall be removed in time, and some potholes shall be filled in time for secondary leveling and compaction..
Scope of application Cement concrete bridge deck pavement is applicable to the construction of cement concrete bridge deck pavement of expressways, first-class highways, etc.
2.3 The industrial standard of the People’s Republic of China Test Specification for Cement and Concrete of Highway Engineering (JTGE30-2005).
Construction operation process 4.1 Process flow 4.2 Operation method 4.2.1 Surveying and setting out 1) Bridge deck pavement elevation measurement control: calculate the thickness of bridge deck pavement through the elevation measurement of control points, and confirm that it meets the design requirements by comparing with the design thickness.
3.3 Material preparation 3.3.1 Raw materials: cement, gravel, sand, admixture, reinforcement, etc.
During the measurement, one pile point shall be placed every 8m in the straight section and every 6m in the curve section to accurately control the elevation of the cast-in-place pavement.
1.
The steel bar clips connect the track through spot welding to prevent the track from shifting and toppling.
After the track is installed, the track elevation shall be rechecked in a timely manner, and the paver shall trail run if there is no error.
Each paving surface shall be vibrated and rolled back and forth for 3-5 times until the paving surface is dense and flat.
The longitudinal reinforcement parallel to the bridge direction is below, and the protective layer of the longitudinal reinforcement meets the design requirements.
3.1.2 The top surface of bridge deck beam and slab shall be roughened and cleaned, and the survey and setting out shall be completed.
3.2 Preparation of machines and tools 3.2.1 Cleaning equipment: watering cart, air compressor, roughing machine, hammer, broom, etc.
4.2.2 Clean the top surface of the main beam of the bridge deck, roughen it, remove the mortar skin, and restore the embedded reinforcement on the top surface of the main beam.
The reinforcement mesh and the shear reinforcement embedded in the beam and slab shall be bound with binding wire to ensure that the mesh mesh size after binding meets the specifications and standards.
3.3.2 Concrete mix proportion design and test: mix proportion test shall be conducted according to the design strength requirements of bridge deck concrete.
4.
Each pile point shall be marked with red paint and numbered uniformly to prevent data confusion.
The thickness and spacing detection of bridge deck pavement protective layer is shown as follows: 4.2.5 Concrete pouring The concrete pouring of bridge deck cast-in-situ layer is divided into four processes: distribution, tamping, leveling, surface finishing and roughening.
The mesh size of the reinforcement welded mesh needs to be designed according to the width of the bridge floor before construction.
2.
3.2.2 Reinforcement installation equipment: crane, cutting machine, electric welding machine, straightening machine, etc.
The diagram of bridge deck cleaning is as follows: bridge deck cleaning 4.2.3 Paver track laying If three roller shaft paving is used for trial operation, concrete elevation belt with the same grade can be poured on the bridge deck as the track, or channel steel and angle steel can be used to make the track on the top of the beam.
2.1 The industrial standard of the People’s Republic of China, Technical Code for Construction of Highway Bridges and Culverts (JTG/TF50-2011), 2.2 The industrial standard of the People’s Republic of China, Standard for Quality Inspection and Assessment of Highway Engineering (Civil Engineering) (JTGF80/1-2004).
3.4.3 The number and good mechanical performance of tank cars used for concrete transportation shall be guaranteed, and the driver shall be familiar with the transportation route.
The paver shall move forward slowly.
The soil and oil stain on the beam top surface must be completely removed.
3.1.4 After the construction of diaphragms and wet joints between precast beams and slabs is completed, the quantity of various embedded parts and reserved holes shall be determined according to the construction drawings, and the installation work has been completed and accepted as qualified.
First, use an immersion vibrator to compact the paving surface, and then use a paver to compact and level it.
2.4 The industrial standard of the People’s Republic of China Technical Specification for Construction of Highway Cement Concrete Pavement (JTG/TF30-2014) 3.
3.4.2 Ensure that the electricity used at the construction site can meet the needs of construction equipment.
The top surface of the cast iron pipe shall be 0.5~1cm lower than the top surface of the concrete pavement on the side where it is located, which is conducive to drainage of the bridge deck.
Construction Preparation 3.1 Technical Preparation 3.1.1 Get familiar with the construction drawings and prepare the construction organization plan in combination with the site conditions.
3.2.4 Curing equipment: water wheel, plastic cloth, geotextile (or non-woven fabric), water pipe, etc.
Welded mesh must be subject to shear and tensile tests at welding points, and ordinary reinforcement must be subject to tensile tests.
3.4 Operation conditions 3.4.1 The construction road shall be smooth and smooth to ensure the smooth passage of construction vehicles.
3.1.3 Make detailed technical and safety disclosure to construction personnel before construction.
The channel steel of the track can be fixed with 16mm threaded steel bar clips, no more than 100cm each.
Paver track laying diagram is as follows: Paver track laying and paver trial operation diagram is as follows: 4.2.4 Reinforcement mesh and drain pipe installation.
After concrete blanking, the concrete shall be spread evenly manually, and the distribution height shall be controlled to be 1~2cm higher than the bottom of the roller, and then the tamping shall be started.
3.2.3 Concrete pouring equipment: concrete mixing station, track paver or three roller shaft, concrete tanker, vibrator, aluminum alloy square steel, etc.
The drain pipe shall be set on the side with lower cross slope of the bridge deck.
