1. Gravity concrete pier construction
【Formula】Chisel the waterproof layered block
(1) Before pouring the concrete of the pier abutment, the top surface of the foundation concrete should be chiseled to remove the rust of the anchor bar.
(2) The pier concrete should be poured horizontally in layers, and the height of each layer should be 1.5~2m.
(3) When the pier abutment concrete is poured in blocks, the joints should be parallel to the side of the pier abutment cross-sectional size is smaller, and the adjacent layer block joints should be staggered, and the joints should be made into tongue and groove shapes. The number of blocks, the horizontal cross-sectional area of the pier shall not exceed 2 within 200 square meters, and shall not exceed 3 within 300 square meters. The area of each block shall not be less than 50 square meters.
(4) When pouring the first layer of concrete on the pier abutment on the open-cut foundation, it is necessary to prevent the water from being absorbed by the foundation or the water at the top of the foundation from penetrating into the concrete and reducing the strength.
2. Cast-in-place column pier construction
【Formula】Chisel and clear the slurry at one time, and it is a V-pipe mold to fill the shrinking soil
(2) The contact surface between the pier column and the cushion cap foundation should be chiseled to remove the rust of the steel bar. When pouring pier column concrete, a layer of cement mortar with the same mix ratio should be paved. The concrete of the pier column should be poured continuously at one time.
(3) When there is a tie beam connected within the height of the column, the tie beam should be poured synchronously with the column. The V-shaped pier stud concrete should be poured symmetrically.
(4) When the precast concrete pipe is used as the outer mold of the column body, the installation of the precast pipe shall meet the following requirements:
1) The foundation surface should be grooved joint, and the groove depth should not be less than 50mm.
2) After the upper and lower pipe sections are installed in place, four vertical square timbers should be symmetrically arranged around the pipe string and tied firmly to prevent impact dislocation.
3) The outer mold of the concrete pipe column should be provided with diagonal braces to ensure the stability of pouring.
4) The joints of the pipe section should be sealed with cement mortar and other materials.
(5) The concrete-filled steel tubular pier stud should be made of compensating shrinkage concrete, and the continuous pouring should be completed at one time.
3. Cast-in-place cover beam construction
[formula]: The whole fast group is hung and pre-covered and dismantled
(1) When constructing the cover beam in the busy section of urban traffic, it is advisable to use the overall assembly template and the quick-assembly combination bracket to reduce the time of road occupation.
(2) when the cap beam is a cantilever beam, the concrete pouring should start from the cantilever end; the time for removing the bed mold of the prestressed reinforced concrete cover beam should meet the design requirements; if there is no requirement in the design, the grouting strength of the channel should reach the design strength before the bottom template can be removed.
4. Prefabricated column installation
【Formula】The wedge hook at the mouth of the cup is removed
(1) The concrete strength of the foundation cup mouth must meet the design requirements before the precast column can be installed. The length, width and height of the cup mouth should be checked before installation to confirm that it is qualified. The contact surface between the cup mouth and the prefabricated parts should be chiseled, and the embedded parts should be derusted and the position should be checked, and they can be installed only after they are qualified.
(2) After the prefabricated column is installed in place, it should be fixed with a hardwood wedge or steel wedge, and a diagonal brace should be added to keep the column stable, and the hook can be removed only after ensuring stability.
(3) After installation, the cup mouth concrete should be poured in time, and the hard wedge should be removed after the concrete is hardened, and the secondary concrete should be poured, and the cup mouth concrete can be removed only after the design strength reaches 75%.
5. Installation of prefabricated reinforced concrete cover beams
【Formula】Chisel and remove the stable column inspection and pouring
(1) Before the installation of the prefabricated cover beam, the concrete surface of the joint should be chiseled, and the embedded parts should be rusted.
(2) When the prefabricated cap beam is installed on the pier platform column, the pier platform column should be fixed and supported to ensure stability.
(3) When the cap beam is in place, the axis and the size of each part should be checked, and the joint concrete should be poured only after it is confirmed. After the joint concrete reaches the design strength, the temporary fixing facilities can be removed.
6、gravity type fortification platform
【Formula】Clear the pole and lay wet stones
(1) Before the pier masonry, the foundation should be cleaned, kept clean, and the pay-off should be measured and the line rod should be set.
(2) The masonry of the pier should be layered by the slurry method, and the vertical joints should be staggered and not penetrated.
(3) The masonry pier facing stone should start from the curved part or corner.
(4) The compressive strength of the pier water separator facing stone shall not be lower than the design requirements.
(5) The masonry stone and concrete prefabricated blocks should be cleaned and kept moist.
Yesterday 速记口诀
1. Pile sinking method and equipment selection
Hammer vibrating injection static drilling, ground type dense force
2. Preparation for pile sinking
The site reduces noise, the degree of penetration is the same, and the anti-corrosion data is tested
3. Key points of construction technology
Finally help the observation and supervision. The head is badly uplifted, and the oblique movement floats badly
4. Preparation of bored piles
Geological Quality Measures Record
5. Hole forming method and equipment for mud wall protection
Forward and reverse circulation, impact spinning diving
6. Dry operation hole forming method and equipment
Punch and grasp the long helix of the bottom of the reaming
7. Preparation of bored pile mud
The ratio of mechanical soil layer is clear and dense with sand and sticky, and the waste is recycled and reused
8. The bored pile casing is buried
It is 2.3m above the surface of the ground
9. Forward and reverse circulation drilling
Thickness of stony particle size
10. Percussion drilling into holes
Hole inspection and slurry slag
11. Rotary digging into a hole
Hole pulping to check the slag
12. Drilling and expanding the bottom
The top vibration is high each time
13. Manual digging holes
Diameter and depth mixed support, the same day quick dismantling in the bias
14. Key points of reinforcement cage and cast-in-concrete construction
Hanging into positioning, cage diameter ready mix pouring, high temperature diameter ratio
15. Underwater concrete pouring
The hole cage is compared to the collapse, and the ball distance is stopped
16. The catheter should meet the following requirements:
The leakage wall diameter is long, and the axis of the joint is deviated
Three days agoShorthand mantra 4/14
1. The role of bridge bearings
The force transmission device is connected to the part
2. Functional requirements of bridge bearings
Inherit the small change, and recuperate and repair
3. Bridge bearings are classified according to the possibility of deformation
There are many fixed orders
4. Bridge bearings are classified according to materials
Steel polyglue
5. Bridge bearings are classified according to structural form
Pull the arc ball of the shaft, commonly used plate basin glue
6. Selection of bridge bearings
Knot-span inversion value
7. General provisions for the construction of bridge bearings
Pre-biased plate washing stone block
8. Plate rubber bearing
High-definition flat, quasi-dense paste
9. Cast-in-place beam and basin bearing installation
Check and chisel the security inspection and fill the final condensation and removal bolt
10. Installation of prefabricated beam basin bearings
Pre-embedded fastening and hanging, and mold filling inspection and dismantling
11. The main control project of bearing construction quality inspection
The evidence is densely pasted across the hole stone, and the buried depth is exposed and the slip material is filled
12. General items of bearing construction quality inspection
The bearing is highly deviated
13. The bridge expansion device is arranged
The beam end bridge is hinged
14. The role of bridge expansion joints
Shift the connection, smooth over
15. Performance requirements of telescopic devices
Change the water and break the fence, and the security check and maintenance are decontaminated
16. Classification of bridge expansion and contraction devices
Steel mod against bullets
17. Transportation and storage of bridge expansion devices
Avoid light, clean and rain and snow, and do not heat and prohibit heat when it becomes hot
18. Construction and installation of telescopic devices
Approve the chisel and clear the hanging, heavy on the high flat fast, and clear the mold handover
Seven days agoShorthand mantra 4/10
1. The compressive strength of concrete
15 statistical standard deviations, ten groups of unknown methods
2. Concrete raw materials
Cinder silica boiling powder
3. Concrete construction
Metering, stirring, transportation and watering
4. Raw material measurement
The measuring instrument is checked regularly, and the bone water is added at one time.
5. Concrete mixing
The uniform color does not leave the secretion, and the collapse 2 sticky protection when mixing
6. Concrete transportation
It can tolerate and protect the prohibition of collapse and mixing/condensation leakage and absorption, and the prohibition of collapse and mixing.
7. Inspection before pouring concrete
Molded base embedded rib joint
8. Concrete pouring
The amount of pump is continuous in the same section, and the dispersion of vibration is delayed
9. Concrete curing
Vacuum thin plastic film, covered with sprinkling culture. 5. Keep warm and strong
Two weeks agoShorthand mantra 4/3
1. Spray oil, location, timing and maintenance time through the layer
Liquid emulsion draining and non, slightly dry but not hard, sealing the variety gas test.
2. The adhesive layer is sprayed with oil, parts and timely opportunities
Drain and structure drain water, sprinkle cracking and condensation on the same day
3. The sealing layer is sprayed with oil and aggregates
Change the milk, hard grinding/diameter
4. Construction methods and meteorological requirements of the adhesive sealing layer
The locomotive is paved or sparsely sealed, and the temperature is ten or five winds
5. Transportation and paving of asphalt mixture
Anti-stick covering should not be used, wait for the tire material to be emptied.
6. Paver layout and operation
Warm machine brush, pre-speed flat. The fast main joint table is full width, and the 6m wide ladder is paved with the same paving.
7. The minimum paving temperature for mechanical paving
Under the thick wind
8. Mechanical paving loosening coefficient
Loose paving mixing machine, test paving test pressing.
9. Construction inspection of mechanical paving asphalt surface course
Thick slope arches
10. Manual paving of asphalt surface course
Half of the block can not be raised, and it cannot be stopped while paving
11. General requirements for asphalt pavement compaction
Thick flattening temperature rate
12. The asphalt pavement compaction road section is long, and the type of road roller
The pressure to the road section is long, the dense tire coarse vibration three-wheel steel, the initial steel and the final pressure on the two wheels
13. Precautions for asphalt pavement compaction
Anti-stick brushes are not allowed to be sprayed
14. Asphalt pavement joints
Tight and smooth, check the wrong seams, ladder hot and semi-cold, high surface flat
15. The asphalt pavement is open to traffic
Spontaneous precipitation 50