1, catheter blockage

During the perfusion process, the sputum can not fall in the catheter, which affects the smooth operation of the perfusion.

Etiology analysis: When the initial irrigation is done, the plug is blocked by water; the coarse bone size is too large; the slump is not suitable, the workability and the fluidity are poor, and the mixing is uneven, and the segregation occurs; when the joint of the pipe and the weld are not dense, the occurrence occurs. Water leakage, water plug is formed in the pipe; when the pipe is not full and contains air, the pipe is poured into the pipe, resulting in the formation of a high-pressure gas plug in the pipe, or the gas plug squeezing the pipe joint seal and causing the pipe to leak; mechanical failure, the pipe The internal hemorrhoid has been initially condensed to increase the drop resistance.

Control measures The diameter of the water-blocking plug should match the inner diameter of the pipe and can be smoothly discharged from the pipe. The water-proof rubber pad should be installed on the top surface of the water-blocking plug. Firstly, 0.2~0.3m3 cement mortar should be stored and poured, and the sputum should be poured to prevent the bone length. For the water blocking plug, the coarse aggregate with particle size less than 25mm is selected, and the maximum particle size is not more than 1/4 of the inner diameter of the pipe and the minimum clearance of the main reinforcement of the steel cage; the strict mixing ratio is controlled, the slump is controlled at 16~22cm, and the slump is controlled. The time to reduce to 15cm is generally not less than 1h; the mixing of the crucible is uniform, the mixing time of the mixer is more than 90s; to ensure the sealing of the joint between the conduit and the weld, the conduit should be tested at a pressure greater than 0.5~0.7MPa for more than 15min. Do not leak, so as not to form a water plug in the conduit; during the pouring process, it should be slowly poured into the funnel of the funnel to avoid the formation of a high-pressure gas plug in the conduit; in order to ensure the normal operation of the machine, there must be a spare mixer, if necessary, can be mixed in the crucible Retarder; use long rod smashing, strong shaking tube, or install vibrator at the upper end of the tube to force the water plug or sputum to fall. If the above method is invalid, the tube should be cleaned immediately, and the sputum in the hole should be re-appared. water Pick-up treatment; when the water-blocking plug blocks the pipe, the mash mixture scattered at the bottom of the hole can be removed, and the water-blocking plug can be re-irrigated; when the hole in the hole has not been initially condensed, the pipe is cleaned as soon as possible, and then down to ç ¼Face, open the pump and rinse the slurry and then re-insert the water plug. After the water plug is flushed out, insert the pipe into the original watering raft as far as possible, insert the pipe in the upper and lower direction, make the sputum mixed and compact, and then continue to water; After the initial setting of the crucible, it can be re-cleared by drilling the drill with a slightly smaller diameter of the steel cage to the bottom end of the original conduit. It is better to add a smaller diameter steel cage to the new hole and water the crucible according to the normal procedure.

2, the steel cage floats or sinks

Refers to the phenomenon that the position of the steel cage is higher or lower than the design position. When the floating is large, the pile is resistant to horizontal shearing; excessive sinking brings trouble and loss to the civil construction.

Etiology analysis The initial position of the steel cage is too high or too low, the turbulent fluidity is too small, the depth of the catheter is too large in the raft (6m or more), the steel cage is lifted by the dome support; the conduit is buried too long, and it is easy to shake when lifting It is difficult to align the center of the cage, and the hanging cage phenomenon is easy to occur; the pipe lifting process is too fast, the instantaneous recoil force causes the steel cage to float; the steel cage is made of poor quality or improperly hoisted and deformed; or the pile hole is inclined, the steel cage is inclined The deformation is then increased, and the squatting force is increased; the bottom of the cage is bent inwardly to buckle the pipe; the steel cage and the hole are fixed, and the wire is elongated and sinked under the weight and pressure; or the weight of the steel cage is too light , was capped.

Control measures The initial position of the steel cage rotation is accurate and fixed firmly with the orifice. In order to prevent the wire from sinking or resisting the lifting force, lifting or casing can be used to hold the upper part of the steel cage; speeding up the filling, shortening the pouring time or adding a retarder to prevent the top layer from entering the steel cage When it is close to the bottom of the cage, the buried depth of the control pipe is 1.5~2m. Try to reduce the insertion of the conduit and use the rotating conduit to compact the concrete. For each watering, check the depth of the burial, diligently measure the depth, and dilute the pipe until the steel is removed. After the cage is buried, the normal buried depth is restored. Generally, it is controlled at 2~4m, the maximum is not more than 6m, which is convenient for turning and shifting. When the steel cage rises, stop pouring the concrete, check the depth of the buried pipe, remove part of the pipe, and keep the buried pipe 1.5~2m. When the catheter is hooked to the cage, the catheter is lowered, and the rotation is displaced and the hook is lifted.

3, broken pile

After the solidification, the crucible is not continuous, and the intermittent pile filled with loose body and mud in the middle affects the integrity of the pile itself, reduces the strength and bearing capacity of the pile, and does not meet the design requirements.

Etiology analysis The large loss of formula and the discontinuity of the watering process are important causes of broken piles. Buried pipes, stuck tubes and other conditions will cause broken piles during the filling process: 1 buried pipe: the pipe is buried in the concrete Too long, the steel cage is deformed, the perfusion time is too long, the crucible has been initially set, the internal resistance is multiplied, the conduit is stuck in the crucible; the flange is placed against the lower end of the reinforcement cage, and the cage is rubbed against the hole wall due to the large hole inclination The resistance is too large, and the cage has a certain high enthalpy, so that the tube can not be lifted; 2 card tube: the aggregate is unreasonable, contains large-diameter pebbles, boulder; the time of the mixing machine or the long transportation distance , has been isolated from the local initial condensation phenomenon and used directly for perfusion, poor catheter sealing, local leakage.

According to the requirements of relevant regulations, the control ratio is determined by computer and trial matching. The ç ¼ should have good and easy and fluidity. The slump loss should meet the perfusion requirements. The initial setting time should be twice the normal perfusion time. The perfusion process is continuous and rapid, preventing the above-mentioned buried pipes, tubes and other situations.

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