What is a rotary excavation cast-in-place pile?
Rotary excavation cast-in-place piles are a foundation treatment technology widely used in construction projects. They are mainly used to improve the bearing capacity and stability of the foundation. In recent years, with the rapid development of infrastructure construction, rotary cast-in-place pile technology has become a hot topic in the engineering field due to its high efficiency, environmental protection, and strong adaptability. This article will introduce in detail the definition, construction process, advantages and disadvantages, and application scenarios of rotary excavation piles.
1. Definition of rotary excavation cast-in-place piles
Rotary excavation cast-in-place piles are pile foundations formed by drilling holes with a rotary drilling rig and then pouring concrete into the holes. Its core feature is to use the rotary cutting effect of the rotary drilling rig to cut the soil or rock layer into holes, and then put the steel cage into it and pour concrete to finally form a high-strength pile body.
2. Construction process of rotary excavation cast-in-place piles
The construction process of rotary excavation piles mainly includes the following steps:
| step | describe |
|---|---|
| 1. Site preparation | Clean up the construction site and ensure the ground is flat to facilitate drilling rig operations. |
| 2. Measurement and positioning | According to the design drawings, determine the pile position and conduct accurate measurements. |
| 3. Rotary digging into holes | Use a rotary drill to drill until the design depth is reached. |
| 4. Clear holes | Remove the sediment at the bottom of the hole to ensure the hole is clean. |
| 5. Lower the steel cage | Place the prefabricated steel cage into the hole. |
| 6. Pour concrete | Concrete is poured into the hole through the conduit to form a pile body. |
| 7. Maintenance | After the concrete has solidified, perform necessary maintenance. |
3. Advantages and disadvantages of rotary digging cast-in-place piles
As a mature foundation treatment technology, rotary digging cast-in-place piles have the following advantages and disadvantages:
| advantage | shortcoming |
|---|---|
| 1. The construction speed is fast and the efficiency is high. | 1. It has high requirements on geological conditions and is not suitable for soft soil layers. |
| 2. Low noise and good environmental performance. | 2. The equipment cost is high and the initial investment is large. |
| 3. The hole forming quality is high and the pile body is strong. | 3. The mud ratio needs to be strictly controlled during the construction process. |
| 4. Strong adaptability and can be used in a variety of strata. | 4. Construction is difficult under complex geological conditions. |
4. Application scenarios of rotary excavation cast-in-place piles
Rotary excavation cast-in-place piles are widely used in the following engineering fields:
| Application areas | Specific cases |
|---|---|
| 1. High-rise buildings | It is used to improve the bearing capacity of the foundation and ensure the stability of the building. |
| 2. Bridge engineering | As the bridge pier foundation, it bears the bridge load. |
| 3. Subway engineering | Used for foundation treatment of subway stations and tunnels. |
| 4. Port terminal | As a dock pile foundation, it resists the impact of waves. |
5. The relationship between hot topics in the past 10 days and rotary dug cast-in-place piles
Recently, rotary digging cast-in-place pile technology has appeared frequently in the following hot topics:
| hot topics | Related content |
|---|---|
| 1. Green construction | The low noise and low pollution characteristics of rotary excavation piles are in line with the green construction concept. |
| 2. Speed up infrastructure construction | Large-scale infrastructure projects in many places use rotary cast-in-place pile technology to promote project progress. |
| 3. Technological innovation | The development of new rotary drilling rigs has improved construction efficiency and quality. |
6. Summary
As an efficient and environmentally friendly foundation treatment technology, rotary digging cast-in-place piles play an important role in modern engineering construction. Its construction process is standardized and adaptable, but it also has certain limitations. With the continuous advancement of technology, rotary cast-in-place piles will be used in more fields to provide strong support for infrastructure construction.
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