What is the technological process of bored pile?

In the construction process of foundation pit support, bored pile technology is generally needed. In order to ensure the construction quality, it is generally necessary to follow the correct construction technology. What is the technological process of bored pile? Let's study with Bian Xiao.

What is the technological process of bored pile?

1, measuring and setting out, and preparing the working face.

Before bored pile construction, it is generally necessary to pay off first, and then prepare the working face according to the construction requirements. In other words, firstly, the pile position needs to be measured and released, and the working face needs to be cleaned, and the deviation of pile position generally cannot exceed the requirements of relevant construction specifications.

2. Embedded gasket

(1) Secondly, the lining should be buried. When burying the lining, the lining should usually be buried at a depth of about 2 meters to 4 meters. If there are special circumstances, it can be deepened appropriately to ensure the smooth drilling and concrete pouring construction.

(2) The inner diameter of the pile casing should generally be larger than the diameter of the pile, and the diameter of the pile should be 20 cm to 40 cm. The vertical line in the center of the pile casing should coincide with the center line of the pile. If there are other provisions in the design scheme, it is not included. Generally, the plane error should be about 50 mm, and the inclination of the vertical line should not exceed 1%.

3, drilling rig in place

After the rig is in place, appropriate measures should be taken to ensure that the center of the rig coincides with the center of the pile location, even if there is deviation, it should not exceed 20 mm After the rig is in place, it must be placed stably, and appropriate measures should be taken to fix the rig to ensure that the rig will not shift and shake during operation.

4. Stir the mud for protecting the wall, drill holes, and start making reinforcing cages at the same time.

Next, water and clay should be mixed together according to a certain proportion, and then fully stirred in the mud pit and borehole by machinery to make it into wall protection mud. When the drilling rig starts drilling, it should be drilled slowly within a certain range, and the drilling speed can be accelerated only when the guide part or the drill bit completely enters the soil layer. In addition, it is necessary to start making steel cages. When making reinforcing cages, it is necessary to ensure that the dimensional deviation of reinforcing cages does not exceed the requirements of relevant construction specifications.

5, hole cleaning

(1) hole cleaning generally requires two operations, and the depth of the hole should meet the relevant design requirements. Therefore, when cleaning holes, the hole depth, aperture and verticality must be checked in detail, and the first hole cleaning can be carried out only after it is confirmed that they meet the design requirements.

(2) After the steel skeleton and conduit are placed, the hole can be cleaned for the second time before pouring concrete. At this time, construction machinery can be used to carry out construction by replacing mud. In the second hole cleaning, the positive circulation method is generally needed in terms of aperture, hole depth and design requirements.

6, steel skeleton placement

When handling and hoisting the steel skeleton, we should try our best to prevent the deformation of the steel skeleton. When placing the steel skeleton, it should be aligned with the center of the hole to avoid the collision between the steel skeleton and the hole wall. After the steel skeleton is in place, it should be fixed with steel wire rope or steel bar in time to ensure that the position of the steel skeleton conforms to the relevant construction specifications, and to ensure that the steel skeleton will not shift during the construction of placing conduits, cleaning holes and pouring concrete.

7, adjust the catheter, pouring underwater concrete.

Next, we should start the construction of adjusting and placing conduits and pouring underwater concrete. When pouring underwater concrete, the steel conduit jacking method should be adopted, and the conduit interfaces should be connected by threads or flanges. When connecting, you must add a sealing ring or rubber pad, and then tighten the thread or bolt to avoid loosening the connection position. In addition, we must ensure that the underwater concrete has good workability, and the slump should generally be between 180mm and 220 mm.

The above is a detailed introduction to the technological process of bored pile, and friends who need bored pile construction can learn more about it. If you want to know more information, you can continue to pay attention to our family information. I hope the above knowledge can help you.