How to prevent the phenomenon of pipe blockage in pouring concrete

1. Control the workability and slump of concrete.

The ratio of the maximum particle size of coarse aggregate to the diameter of the conveying pipe should be: when the pumping height is less than 50 m, it should not be greater than 1 3 for gravel and 1 for pebbles; When the pumping height is 50 100 m, the proportion should be 1 3 1 4;When the pumping height is more than 100 m, the proportion should be 1 4 1 5. The coarse aggregate should be graded continuously, and the content of needle flake particles should not be greater than 10%.

The water-cement ratio of pumped concrete should be.

The sand content of pumped concrete should be 38% 45%. Medium sand should be used for fine aggregates, and the amount of sand passing through mm sieve holes should not be less than 15%.

2. Reasonable arrangement of pipeline connections

When designing and installing pipes, avoid 90° and S-bends as much as possible to reduce the resistance of pumping concrete, thereby reducing the possibility of pipe blockage.

At the outlet cone of the pump, it is not allowed to directly connect the elbow, and at least 5 m straight pipe should be connected before connecting the elbow.

For vertically downward pipelines, anti-segregation devices should be installed at the outlet to prevent pipe blockage.

When pumping at a high level, the length of the horizontal pipeline should generally not be less than 15% of the length of the vertical pipeline, and the pipeline stop valve should be connected to the horizontal pipeline. When the downtime is more than 5 min, the shut-off valve should be closed to prevent the pipe from being blocked due to the backflow of concrete. The bending radius of the 90° bend from horizontal to vertical should be greater than 500 mm.

3. Check the sealing condition of the pipeline.

Leakage caused by poor pipeline sealing will affect the pouring quality of concrete on the one hand, and on the other hand, it will lead to the reduction of concrete slump and the loss of pumping pressure, resulting in pipe blockage.

If the sealing of the joint of the conveying pipeline is not tight, the pipe clamp is loose or the sealing ring is damaged, resulting in slurry leakage, the pipe clamp should be tightened or the sealing ring should be replaced. The piston is worn and should be replaced in time, otherwise it will lead to pipe blockage due to slurry leakage and pressure loss, and it will also aggravate the wear of the piston and delivery cylinder.

4. Lubricate the pipe wall.

Before pumping concrete, the pipeline should be lubricated with clean water, and the mortar should be sent first, and then the concrete should be sent to prevent the pipeline from clogging. After wetting the pipe with water before pumping, loosen the pipe joint from the lowest point of the pipe and drain all the remaining water, or after pumping the water but before pumping the mortar, put in a sponge ball to separate the mortar from the water.

When the pipe is cleaned after pumping concrete, a sponge ball should also be put in to separate the water from the concrete, otherwise it is easy to cause pipe blockage. After pumping concrete, the hopper and conveying piping system must be carefully cleaned.

If the residual concrete in the cylinder is not clean, the concrete is easy to solidify on the cylinder wall, and when the piston runs again, the piston sealing surface will directly bear the impact of the solidified concrete on the cylinder wall, resulting in the local spalling of the push piston.

Control the slump, it is too thick to block the pipe. If it's too thin, it will also be blocked, and if it's too thin, the pulp will be knocked out, and there will only be stones in the pump pipe.

The coagulation is thinned, and the pump pipe is cleaned.

Hello, the treatment method is as follows: 1. Improve the concrete pouring speed, try to accumulate a large amount of concrete when starting to pour concrete, and produce a great impact force to overcome the mud resistance; 2. Rapid and continuous pouring keeps the concrete and mud in a flowing state, which can prevent the catheter from being blocked; 3. In the process of pouring concrete, it should be poured in the hopper of the guide pipe at a uniform speed; 4. The quality of concrete must be controlled and the workability of concrete must be improved; 5. The upper part of the conduit can be dredged with steel bars, and the conduit can be extracted from the lower part and vibrated up and down. Additional Information:

Introduction to the reasons for the blockage of the conduit when the cast-in-place pile is poured concrete: 1. The pouring time is too long, and the upper concrete is close to the initial setting, forming a hard shell, and with the growth of time, the residue in the mud will continue to precipitate, thereby thickening the sediment accumulated on the surface of the concrete, causing the concrete to be extremely difficult to perfusion, resulting in pipe blockage; 2. In the process of pouring concrete, if a large amount of air in the concrete conduit cannot be discharged immediately, it may lead to pipe blockage. 3. The workability of concrete is not good or segregation makes the stones gather together and the fluidity is poor, resulting in pipe blockage; 4. The catheter is not rinsed in time after use, resulting in the retention of deposits on the inner wall.

Dear, hello, I am glad to answer for you: what is the pipeline concrete plugging used to lift lead A: Dear, hello, concrete material.

Concrete, abbreviated as "concrete (tóng)": Antler refers to the collective term for engineering composite materials in which aggregates are cemented into a whole. The word concrete usually refers to the use of cement as cementitious material, sand and stone as aggregates; Cement concrete, also known as ordinary concrete, is widely used in civil engineering engineering by mixing, forming and curing cement concrete obtained by mixing with water (with or without admixtures and admixtures) in a certain proportion.

Summary. There are several ways to quickly dredge concrete pipe plugging: 1

High-pressure water jet cleaning method: The high-pressure water jet is used to impact the inner wall of the concrete pipeline, and the silt, sand and gravel in the pipeline are washed away to achieve the purpose of dredging. 2.

Mechanical cleaning method: Use professional pipe cleaning machinery to remove debris in the pipeline by rotating the brush head or high-speed jet water. 3.

Chemical cleaning method: use a chemical cleaning agent to pour it into the pipeline, and dissolve or decompose the debris in the pipeline through chemical reaction to achieve the purpose of dredging. 4.

Blasting method: For more serious concrete pipe blockage, blasting can be used to dredge. This method requires professionals to operate and has certain dangers.

It should be noted that when dredging concrete plugging pipes, appropriate methods should be selected and safety operating procedures should be followed to avoid unnecessary losses.

The rapid dredging methods of concrete pipe plugging are as follows: 1High-pressure water jet cleaning method:

The high-pressure pin water jet is used to impact the inner wall of the concrete pipeline, and the silt, sand and gravel in the pipeline are washed clean to achieve the purpose of dredging. 2.Mechanical Cleaning Method:

Use professional pipe cleaning machinery to remove debris from the pipes by rotating the brush head or high-speed jet water. 3.Chemical Cleaning Method:

Use a chemical cleaning agent to pour it into the pipeline, and dissolve or decompose the debris in the pipeline through chemical reaction to achieve the purpose of dredging. 4.Demolition method:

For more serious concrete pipe blockage, blasting can be used to dredge. This method requires professionals to operate and has certain dangers. It should be noted that when dredging the concrete Shenghe soil plugging pipe, the appropriate method should be selected and the safety operation procedures should be followed to avoid unnecessary losses.

I'm sorry I don't understand, but can you elaborate on that?

You can try the above methods.

Here's how to deal with it:

1. Improve the concrete pouring speed, and try to accumulate a large amount of concrete when starting to pour concrete, which can overcome the mud resistance by generating a great impact force;

2. Rapid and continuous pouring keeps the concrete and mud in a flowing state, which can prevent the catheter from being blocked;

3. In the process of pouring concrete, it should be poured in the hopper of the guide pipe at a uniform speed;

4. The quality of concrete must be controlled and the workability of concrete must be improved;

5. The upper part of the conduit can be dredged with steel bars, and the conduit can be extracted from the lower part and vibrated up and down.

When pouring concrete in cast-in-place piles, the conduit is blocked, if it is not concrete segregation or the concrete setting time is advanced, first poke through with steel bars, and if it can't pass, use a crane to hang the I-beam and poke it, and shake up and down at the same time (be careful not to lift the conduit out of the concrete, so as not to cause the pile to break due to the mud entering); If it is not possible, it is recommended to remove the concrete in the conduit section by section, and when the conduit is not proposed to be buried in depth of one meter on the way, the concrete is poured down, and the pile is continued; If the conduit is pulled out of the concrete embedding depth, then dredge the conduit thoroughly, dry the conduit with a sandbag at the lower mouth of the hopper (can fall down) and tie it to the hopper with iron wire, cover the lower mouth of the hopper, and insert the conduit into the concrete meter at the same time, fill the hopper with concrete, pull out the cover and cut the wire that fixes the sandbag, carry out the secondary pouring of the cast-in-place pile, and the continuous pouring of concrete forcibly discharges the mud from the cast-in-place pile. If the technology is mastered well, the concrete is not finally set, and the poured cast-in-place pile still has a chance to be a pile-like pile, and the worst is also a pile-like pile. If it doesn't work, you can only punch the hole in place again.

The above suggestions need to be carried out by a very experienced bridge engineer on site, otherwise it is best to backfill the secondary punching side immediately and delay the construction period.

If there is any mistake, please correct it!

If there is a collapsed hole, it can only be abandoned, and the location next to it can be re-beaten.