What problems can be caused by excessive sediment thickness when pouring underwater piles?

The high thickness of the sediment may directly lead to the failure of your pile foundation inspection.

How thick the sediment thickness is, if there are requirements in the design, do not exceed the design regulations.

The consequence of excessive thickness is that the bearing capacity of the monopile may be unqualified.

The foundation is sinking, the concrete is slag inclusion, and the concrete strength is not up to standard.

Summary. Hello dear, the reasons for the suspension of 2 meters in the air may be caused by the following points: 1. The initial stock of concrete in the storage hopper must be full.

When the bottom end of the catheter is first injected, the concrete body can be buried, and the distance from the bottom end of the conduit to the bottom of the hole should be kept at 300

500mm, in order to facilitate the smooth discharge of dry coagulation ten self-catheters.

With the gradual rise of the concrete surface inside the hole, the bottom of the conduit.

The depth of the end buried under the concrete surface outside the pipe should generally be maintained at 2-3m and should not be less than.

The concrete filling coefficient of bored piles shall not be less than, and the general soil quality shall be taken, and the soft soil shall be taken.

There is no sediment in the underwater pile, what is the problem with the conduit hanging 2 meters in the air when pouring.

Hello dear, the reason for the suspension of 2 meters in the party pipe may be caused by the following points: 1. The initial stock of concrete in the storage hopper must meet the requirements of the bottom end of the conduit when pouring for the first time to be buried in the concrete body, and the distance from the bottom end of the conduit to the bottom of the hole should be kept 300 500mm, so as to facilitate the smooth discharge of the dry coagulation ten self-conduit, with the gradual rise of the concrete surface in the hole, the depth of the bottom end of the conduit buried in the concrete surface outside the pipe should generally be maintained at 2-3m, and shall not be less than. The concrete filling coefficient of bored piles shall not be less than, and the general soil quality shall be taken, and the soft soil shall be taken.

During the construction period, the mud surface in the casing should be higher than the groundwater level, and when affected by the fluctuation of the water level, the mud surface should be higher than the highest water levelDuring the hole cleaning process, the mud should be continuously replaced until the concrete is poured. Before pouring concrete, the mud ratio within 500mm at the bottom of the hole is less important; Sand content 8%; Viscosity 28s...

In the soil layer that is prone to mud leakage, measures should be taken to maintain the stability of the hole wall.

1.During the construction period, the mud surface in the casing should be higher than the groundwater level, and when affected by the fluctuation of the water level, the mud surface should be higher than the highest water level2.

During the hole cleaning process, the mud should be continuously replaced until the concrete is poured. 3.Before pouring concrete, the mud ratio within 500mm at the bottom of the hole is less important; Sand content 8%; Viscosity: In the soil layer that is prone to mud leakage, measures should be taken to maintain the stability of the pore wall.

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What is the problem with the quality of the pile, and the problem of overhanging the pile will lead to the problem of instability in the later stage! Hope it helps, I wish you a happy life!

The sediment thickness of the underwater cast-in-place pile is greater than 10 cm to determine several types of piles: the sediment thickness of the underwater cast-in-place pile is greater than 10 cm, and the pile foundation detection results are divided into four categories, the first and second types of piles indicate that the pile is no problem, and the third type of pile is a problem, and the next process construction can only be carried out after the collapse of the eggplant, and the four types of piles must be reworked for treatment. The integrity testing of the pile shall be carried out in accordance with the requirements of Chapter III of the "Testing Specification"; The 2003 version requires that when the three types of piles and the four types of piles account for 20 of the buried town detection piles, the detection range of the tremor circle should be expanded; The 2014 version of the specification abolished the requirement of 20 and only vaguely proposed that the scope of testing should continue to be expanded when the construction parties judged that the test results were invalid.

Sediment thickness of cast-in-place pile: refers to the sediment left by precipitation or collapse during drilling and emptying, which is not carried away by the circulating mud.

Generally, it is coarser particles, and the thickness of the sediment is the layer height of this layer of sediment.

However, some people believe that the sediment thickness is the difference between the measured hole depth and the hole depth measured after the catheter is lowered, or that the different understandings reflect the different understandings of the drilling depth and the actual hole depth after precipitation.

The detection rope is used to detect and measure the size. Then use the depth of the bottom of the hole to subtract the measured size, that is, the thickness of the sediment at the bottom of the hole.

Hello, the sediment of the cast-in-place pile is too thick and the remedial cast-in-place pile has been poured into the concrete, and the sediment is one of the keys to ensure the quality when the pile is constructed. So how to deal with the excessive thickness of the sediment at the bottom of the pile? What is the reason for the excessive thickness of the bottom sediment?

Get up and find out. How to deal with the excessive thickness of the sediment at the bottom of the pile should be cleaned with a conduit on the second stool until it is cleared to the specified requirements. When clearing, it is recommended to choose a dilute mud point, and then thicken it appropriately after cleaning.

In addition, in the process of processing, it is necessary to control the cycle cleaning time to avoid the phenomenon of excessive thickness again. The reason why the sediment at the bottom of the hole is too thick is 1, the improper selection of the hole cleaning method is one of the reasons for the failure to choose the bright plum pair, the more commonly used hole cleaning methods are slurry pumping method and slurry change method, etc., and the hole cleaning effect of each way will be different. However, if the wrong hole cleaning method is selected, the bottom of the hole will not be cleaned, and the thickness of the sediment will be directly affected.

2. This reason will occur if the hole cleaning is not thorough enough, even if the method is chosen correctly, but the hole cleaning time is not enough or not thorough enough, there will also be the phenomenon of too thick sediment. 3. Improper control of hole cleaning mud index In the process of hole cleaning, if the mud used does not reach the specified index, it will also cause the sediment to be too thick, so it is necessary to pay attention to controlling its index number. 4. The hole wall is peeling and collapsing.

In the construction process, if there is no relevant measures to fix the hole, or the measures are not done, then the machine will collide with the orifice or the hole wall when applying I, so that the hole wall peels off and other phenomena, and finally causes the sediment to be too thick.

Answer] :d textbook, pp. 48-53

The bottom should be cleared before pouring underwater concrete, and the thickness of the sediment at the bottom of the pile should meet the design requirements. When the design is not required, the thickness of the sediment at the bottom of the friction pile hole is not more than 200mm, and the column pile is not more than 50mm.

Post-grouting technology can reduce the influence of pile bottom sediment on the bearing capacity of the pile

The effects of cast-in-place pile sediment on pile formation are:

1. When pouring the first concrete, because the sediment is too thick, it will cause the concrete falling by gravity to turn over part of the sediment, and in the process of turning the sediment, Xunsen will have a small amount of sediment mixed into the fresh concrete mu Min mu soil, causing the concrete to be impure and seriously affecting the strength of the concrete;

2. Due to the excessive thickness of the sediment, in addition to the sediment that is turned up, there is a small amount of sediment that has not been turned up and continues to be at the bottom of the hole. At this point, if the poured concrete covers it, a sandwich will form at the bottom of the hole and the bottom of the pile. This interlayer, for the friction pile, its impact is small, and there is an extra layer of weak layer at the bottom of the hole; For end-bearing piles or rock-socketed piles, the bearing capacity of the foundation and the rock-socketing effect will be greatly reduced (as a result, the buoyancy will be generated due to the infiltration of water, which will affect its stability);

3. Due to the small specific gravity of the sediment at the bottom of the pile, it cannot have the effect of embedding at the bottom of the pile, and the effectiveness of resisting the bending moment at the bottom of the pile is reduced, so that there will be a potential large deformation, which is not conducive to the stress and stability of the pile cavity.