Traditional construction techniques are often expensive and labor-intensive when it comes to building strong and dependable foundations. Drilled injection piles are an inventive method that provides strength and efficiency, though. This technique has become more and more well-liked in recent years because it can offer strong load-bearing support with little negative environmental impact.
Drilling deep holes into the ground and then injecting high-strength materials into them is how drilled injection piles are made. A stable foundation is ensured by the methodical placement and compaction made possible by this process. This technique’s adaptability makes it appropriate for a variety of construction projects, ranging from massive commercial structures to residential buildings.
Drilled injection piles’ versatility to various soil types is one of its main benefits. Regardless of the type of terrain—rocky, clay, or loose sand—this technique can be customized to the site’s unique needs. It also causes the least amount of disturbance to the neighborhood, which makes it the perfect option for projects in urban settings where there is a shortage of space and noise pollution is an issue.
Drilled injection piles offer a financially viable and ecologically sustainable answer to today’s building requirements by fusing cutting-edge drilling technology with effective material utilization. Techniques such as these open the door to safer, more environmentally friendly building methods as we continue to push the boundaries of engineering and architecture.
- General principle and technologies of creation
- Differences between CFA and DDS
- Reinforcement and concreting requirements
- Installation conditions
- Scope of application
- Special equipment for installing drilled piles
- Advantages and disadvantages
- Cost of pile-drill foundation
- What are the types of drilled piles and what are their differences??
- Price comparison
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General principle and technologies of creation
Drilling wells to the intended depth is the first step in the work process, according to technology used to lay a drilled injection foundation. Next, a solution is injected under 10 mPa of pressure into the pits that have been prepared using a hollow screw. An internal reinforcement frame is submerged in liquid concrete.
They have a monolithic reinforced concrete structure after the solution hardens, which can be used as a foundation base or as a fastening element in the future.
Differences between CFA and DDS
With the use of specialized tools, developers can lay a drilled injection foundation under a variety of circumstances. Contemporary construction technologies:
- CFA – installation of the power structure is carried out using a hollow auger, which, in addition to the extraction of soil, is designed to fill the well with a solution under pressure. The technology is used for construction in highly dense or waterlogged soils.
- DDS – the technology differs in the method of arranging wells, in which the soil is not extracted, but displaced under the action of a special tool. During excavation work, vibrations and noise do not occur, which makes the method extremely convenient for construction within the city.
Reinforcement and concreting requirements
Nuances in technology:
- A minimum of 6 longitudinal corrugated rods (Ø from 18 mm, steel grade AIII) are used to manufacture the reinforcement cage. Transverse rods are fixed with the same pitch.
- The diameter of the reinforcing structure is always 140 mm less than the size of the well cross-section.
- The maximum length of one reinforcement cage is 11.7 m. At greater well depths, the prepared load-bearing structures are welded directly on the construction site.
- To give maximum rigidity to the reinforcing frame, metal rings made of rods with a diameter of 7–9 mm are welded along the outer side in increments of 2 m.
- On the outside, clamps 7 cm long are welded to the stiffening rings to ensure uniform positioning of the frame inside the well and to organize a protective layer of concrete around the load-bearing element.
- Concrete M300 is used to mix the solution. Cement content – 350 kg/m3. Fine crushed stone (10–20mm) in a volume of at least 25% is used as a filler.
- In order for the mixture to have a plastic consistency, the lignosulfonate component is added to it (no more than 0.2%).
Installation conditions
Regulations governing the process of laying a foundation:
- when drilling wells simultaneously, the minimum distance between them should not exceed three diameters of the hole, otherwise, before developing the next well, wait 24 hours after concreting the previous support;
- the solution is supplied under the same pressure during the reciprocating movement of the screw;
- concreting continues until a clean (without sludge or contaminants) mixture begins to emerge from the well;
- immediately after filling the pit with concrete, a reinforced frame is placed in the liquid solution;
- waste soil is removed with an excavator immediately after installation of the pile.
Scope of application
The following scenarios involve the use of technology:
- during construction in heavily swampy areas where the bearing layer is at a considerable depth.
- when laying the foundation on a site with dense buildings;
- for reconstruction of the foundations of old buildings and architectural monuments;
- to strengthen the walls of the pit;
- to strengthen the foundation before increasing operational loads.
Special equipment for installing drilled piles
On a tracked or wheeled transport base, specialized mobile installations are used for construction work. It is possible to fix rotating drilling equipment on the working platform. The MDR can drill multiple holes simultaneously in this scenario without shifting positions.
The following components make up drilling equipment:
- auger drill;
- rotating mechanism;
- lifting hydraulic cylinders;
- swivel.
Installations with hollow auger columns are used to construct drilled injection foundations, allowing concrete solution to be pumped into the well.
When the mixture is supplied under pressure, a plug is used to prevent the earth cavity from filling up during the drilling process. Multi-section interlocking columns 5-8 meters long are used to work with deep holes.
Advantages and disadvantages
Benefits of the technology
- Reduction of construction work due to complete automation of the process.
- Wide range of applications – from repairing foundations to laying high-strength load-bearing structures.
- Possibility of producing wells with maximum permissible parameters – depth and diameter values.
- The absence of dynamic and vibration loads on the soil and nearby structures, which makes it possible to carry out construction work in areas with dense buildings, as well as restore weakened foundations of old houses.
- The effectiveness of the technique during construction on slopes where there remains a risk of landslides.
Drilled injection foundation drawbacks:
- Breakage of structural bonds in the soil during drilling, which leads to the collapse of the borehole walls. In this way, much more soil is excavated than the volume of the pile, which can cause uneven settlement of the building.
- Soil and sludge will always remain in the concrete solution, which reduces the density and strength of the load-bearing element and makes the bearing capacity of the base unpredictable.
- Due to the presence of boulders and coarse rocks in the soil, the shaft of the drilling injection support deviates from the design position. This may affect the load-carrying capacity and stability of the foundation during operation.
Cost of pile-drill foundation
Factors affecting price:
- delivery of building materials and fitting of equipment;
- marking the pile field;
- direct well development (counted as one linear meter of foundation laying);
- consumption of building material for mixing concrete mortar;
- cost of rolled metal and installation of reinforced frame;
- depreciation of equipment involved in construction;
- additional costs associated with the conditions and complexity of the work.
What are the types of drilled piles and what are their differences??
Bore piles are classified as load-bearing elements with or without casing based on device technology. The inventory tool in the first example keeps the well from collapsing while it is being built. Only in situations with high-density soil can holes without a shell work.
Apart from injection piles that are drilled, the following categories of structures that support loads are employed:
- Bored supports with the same circular cross-section along the entire axis – a traditional way of laying a foundation in private housing construction.
- Supports with a round cross-section, having a widening at the end – thanks to the wide base, the size of which exceeds the diameter of the pile, the foundation is characterized by maximum stability and load-bearing capacity.
- Bored piles – metal structures with a round cross-sectional diameter. At the bottom of the post there is a widening with vertical stiffeners. Such foundations are used for construction on permafrost and hard-plastic soil, as well as in areas containing large debris.
Price comparison
The mean market price for building a pile-drill foundation with different technologies:
Type of power structure | Cost of service, rub./m.pog. |
Bored supports | 1000 |
Bored piles | 1500 |
Bored supports with widening | 1400 |
Bored injection piles using CFA technology | 1900 |
Bored injection piles using DDS technology | 1500 |
The prices listed above are only estimates and should not be interpreted as a judgment on the merits of any one technology; all foundation building techniques are useful and practical in their own right.
This site contains all of the information you require regarding the layout and building of a pile foundation.
Aspect | Description |
What are drilled injection piles? | They are a type of deep foundation used to support structures by drilling into the ground and injecting concrete or grout to form a pile. |
Why use them? | They offer high load-bearing capacity, are suitable for various soil conditions, and minimize vibrations during construction. |
Installation process | The process involves drilling a hole, inserting a reinforcement cage, and then injecting concrete or grout under pressure. |
Benefits | They provide strong, stable support, reduce settlement, and are ideal for sites with limited access or sensitive surroundings. |
Common applications | Used in building foundations, bridge supports, and retaining walls, especially in areas with challenging soil conditions. |
Environmental impact | They are considered environmentally friendly as they produce less noise and vibration compared to traditional piling methods. |
A notable innovation in the construction sector are drilled injection piles. Numerous advantages come with this novel approach, such as improved stability, decreased settlement, and increased load-bearing capacity. Compaction of the surrounding soil through grout injection under pressure strengthens the foundation and enhances the structure’s overall integrity.
Drilled injection piles are notable for their versatility in responding to different soil types and site limitations. They are the best option for projects in urban areas or places with difficult geotechnical conditions because of their flexibility. Furthermore, the installation procedure is not too long and doesn’t interfere too much with the surroundings.
For many building projects, drilled injection piles are an affordable option due to their effectiveness and efficiency. Long-term savings are a result of decreased maintenance expenses and less material waste. Moreover, the capacity to attain exact positioning and profundity guarantees that the structural prerequisites are fulfilled with a significant level of precision.
All things considered, using drilled injection piles in building projects can result in stronger, more dependable structures. It is likely that this approach will establish new benchmarks in the field of foundation engineering as it continues to gain traction. Drilling injection piles provide a dependable and creative solution for individuals wishing to build on solid ground.
Drilled injection piles are a creative and practical way to build load-bearing structures that are incredibly strong and stable. With this technique, a high-strength grout is injected deeply into the ground and allowed to solidify to create a strong foundation. Drilled injection piles reduce noise and vibration, making them perfect for difficult soil situations and urban settings. This makes construction less disruptive and more effective. This method is the go-to option for contemporary building projects because it is dependable and adaptable.