Micro signal of sugar fried beans: olw0908 I know you’re looking at it (this article is described according to the author’s working experience on the construction site and network reference.
(8) Conduit water inflow: once the pouring starts, it cannot be suspended.
(2) Survey and setting out (lead pile layout).
(2) Concrete quality control and others ① before pouring, the performance index of mud in the hole and the sedimentation thickness at the bottom of the hole shall be checked again, and pouring shall be carried out after meeting the requirements.
(2) Hole collapse: when drilling, the rubble shall be re buried and the thick slurry shall pass through quickly.
(12) Start pouring concrete (remove the pipe according to the buried depth of the pipe (generally 4-6m buried)) at the same time of pouring).
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(6) After the completion of pile flushing, the hole shall be cleaned.
(10) After grouting the reinforcement in the cage.
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(17) After the pile foundation is tested to be qualified, the next pile foundation shall be backfilled for construction.
(5) If the sediment is too thick before pouring: continue to reverse the slurry.
(10) Broken pile: depending on the situation, high-pressure grouting can be carried out when it is serious.
(11) After reaching the pouring conditions, depressurize (exhaust) and install the hopper.
In serious cases, the pipe can be removed.
(13) The pouring is completed.
Relative density: 1.03-1.10.
Sand content: less than 2%.
(9) Pipe breaking and burying: strictly control the burial depth of the pipe, generally 4-6m, and remember not to lift the pipe violently.
After there is basically no mud around the hammer, the hole shall be cleaned again (sand can be separated by sand separator to reduce the sand rate).
(3) Pile driver placement, pile casing embedding and small mud pit layout.
(16) Pile foundation inspection.
(14) Remove the conduit (do not flush the inside of the conduit directly with water when removing the conduit).
(15) After pouring, the orifice shall be enclosed and the acoustic pipe shall be protected.
(5) Pile flushing is completed.
If it cannot be solved until the last section has no buried depth, all the pipes can only be removed, reused and inserted into the concrete for secondary pouring; Therefore, remember to control the initial setting time of concrete.
(4) Start pile washing.
Before the hole is formed, it is necessary to negotiate with the team to carry out the air tightness test of the conduit and check whether the conduit leaks.
During the emptying process, the protective wall shall be scraped for 7-8 times.
Before pouring, the height from the conduit bottom to the hole bottom shall be controlled (I generally control it to 60cm).
The shaking conduit shall be inserted (under the condition of ensuring the buried depth).
③ Remember not to add water to the concrete to change the original water cement ratio (especially our construction personnel are not allowed to adjust the concrete slump without permission).
(4) Grouting: immediately stop the adjacent drilling rig, and start another drilling rig when the concrete reaches a certain strength after the drilling and pouring of this drilling rig are completed.
Viscosity of concrete before pouring: 1 ~ 17.4 s.
After adjusting the concrete slump, pour slowly.
This item must be controlled in advance.
(7) After the sand measurement rate is qualified in the first test, the dynamic hammer shall be used for re measurement, and the sediment at the hole bottom shall be tested.
(7) Floating cage: generally, if the concrete collapse of floating cage is too small or the pouring speed is too fast, contact the technical personnel of commercial mixing station immediately.
Continuous pouring is the most stable, and the waiting time during pouring is too long.
(9) Lower the reinforcement cage.
(8) Sediment detection before lowering the reinforcement cage.
Accident treatment of pile foundation construction (1) deviation hole: re fill the rubble to the position where the deviation hole is not, and re drill the hole in case of serious problems.
If it is close to the pile head elevation, dry pile can be connected after excavation; If it is more serious, only re piling and drilling can be carried out.
(3) Slurry leakage: the thick slurry can pass through quickly, or it can be drilled again after the concrete is poured to the position without slurry leakage.
If necessary, the reinforcement cage shall be lifted and re drilled; Therefore, when pouring the pile, the first truck of concrete must be poured quickly, and the mud and a small amount of sediment at the bottom of the hole must be washed away to ensure the quality of the pile body.
(6) Pipe plugging during pouring: knock the pipe wall or shake the pipe up and down when ensuring the buried depth of the pipe.
The time difference between two pouring shall not exceed 1H.
The whole process of pile foundation construction (1) layout of punching platform (preparation of large mud pit, yellow mud and power facilities).
Click the “blue word” above to follow us! Underwater cast-in-place pile construction 1 The working principle of pile driver is a construction method that uses steel wire rope to pull the hammer head to impact the ground to form holes, and then uses mud to protect the wall.
If the slurry concentration is too low, add cement to reverse the slurry (shake the conduit while reversing the slurry).
Before pouring, the workers must add rubber rings and ensure that the conduit joint is tight without wrong wires; If water is found in the tremie after pouring, the water and mud and other sediments in the tremie shall be extracted according to the situation.
If there are too many floating cages, stop pouring, pull and insert conduits up and down to make the reinforcement cage sink slowly, and then pour slowly after sinking to the appropriate position, After pouring a certain height, the pouring speed can be restored without floating cage.
In serious cases, it can be re drilled after concrete pouring.
If there is any error, please correct it and contact the intruder for deletion)..
② The best concrete quality control before pouring is to put a small part of the concrete in the tank car in advance to check the concrete quality, and spot check the slump, fluidity and other working performance of some tank cars at the same time.
