How it is constructed, how it is built and how much it costs for a pile-rammed foundation?

Any construction project must have a strong foundation in order to be stable and long-lasting. The pile-rammed foundation is one such foundational technique that is growing in favor. Using this novel method, the structure above is supported by piles of reinforced concrete driven deep into the ground. Because pile-rammed foundations can evenly distribute the weight of the building across the soil, they are the best option for locations with difficult soil conditions.

An extensive site analysis is conducted to evaluate the soil’s stability and load-bearing capacity prior to the construction of a pile-rammed foundation. Next, engineers plan out the foundation, figuring out where to put each pile and how deep to put it. Generally, each pile has steel reinforcement incorporated into it to increase strength and durability.

Utilizing specialized machinery to drive the piles into the ground is necessary when building a pile-rammed foundation. It is customary to use vibratory drivers or hydraulic hammers to make sure the piles go deep enough to reach stable soil layers. This procedure reduces the possibility of ground movement over time in addition to safeguarding the foundation against settling.

A pile-rammed foundation’s cost depends on a number of variables, such as the structure’s size, the state of the soil, and local building expenses. Generally speaking, the cost is determined by the quantity of piles needed and the depth to which they must be driven. For many construction projects, pile-rammed foundations are a wise investment due to their long-term benefits of durability and structural integrity, even though they may have higher initial costs than traditional foundations.

This article examines pile-rammed foundation construction techniques, procedures, and financial factors. Pile-rammed foundations, which provide a strong base by driving piles deep into the ground, are essential for stabilizing structures on soft or shifting soil. We go into the specifics of the materials and construction methods used to create these foundations. We also examine the variables that affect costs, including labor costs, site conditions, and the kind and quantity of piles needed. When organizing construction projects that call for sturdy, long-lasting foundations, homeowners and builders can make well-informed decisions by being aware of these factors.

What it is?

A foundation with cast-in-place piles is made up of separate supporting components spaced apart by a predetermined amount from one another.

In the event that an even weight distribution is required, the supporting structure and a single grillage are combined. The application of longitudinal reinforcement technology varies according to the base’s requirement for stability and rigidity.

Device Features

The method of installation distinguishes piles employing this technology; power products are made on the construction site and fill pre-formed pits with concrete of class B15 or higher.

The types of cast-in-place piles are classified based on the manufacturing method used:

1. With non-removable shell – concrete is fed into casing pipes, which not only serve as protection against soil spillage during installation, but also protect the piles from the destructive effects of moisture and aggressive soil properties.
2. Support elements without shell – effective for construction on soils with low humidity. As a rule, these are shallow piles of a pyramidal or conical shape.
3. With removable casing – when laying the foundation, casing pipes with a concrete shoe at the end are used, which is knocked down after immersion and serves as an anchor. After the solution is supplied, the inventory items are removed from the well.

Drilling techniques and impact or explosive technologies are used to drill wells. The pits can have a flat bottom or an extended heel, and they can be shaped like a conical or pyramid.

Advantages and disadvantages

Benefits of the technology used in pile-rammed foundation construction:

• the method is effective on almost all types of soil, except rocks;
• construction work does not take much time;
• in most cases, laying the foundation can be done with your own hands, without renting special equipment;
• printed support elements are not subject to corrosion;
• installation can be carried out at any time of the year;
• transportation of materials is associated only with the delivery of reinforcement, concrete and other bulk materials to the site;
• the power structure has sufficient strength and wear resistance to last up to 100 years;
• technology for installing supports does not require a large amount of excavation work.

Apart from the apparent benefits of a pile foundation, the printed approach has the following drawbacks:

• inability to control the quality of packing;
• exposure to horizontal forces in the ground;
• complexity of engineering calculations;
• a significant part of the work is carried out using manual labor.

Application area

The foundation is appropriate for construction based on the specifications of the structural elements:

• one-story and two-story residential buildings,
• outbuildings,
• extensions to buildings,
• garages,
• baths,
• fences and other structures.

Pressed supports are made with grillage and a non-removable shell when heavy structures are to be erected.

The following geological conditions allow for the construction of the foundation:

1. Under the supporting area of ​​the foundation there are weak soils with a bearing capacity of less than 1.5 kg/cm2.
2. The freezing point can be deeper than 2 meters from the surface of the earth.
3. Underground sources are located close to the power structure.
4. The site is densely built up with structures for various purposes and there is no possibility of organizing access for special equipment.

Existing foundations can be strengthened and reconstructed with cast-in-place piles. Injecting solution through perforated casing pipes while applying pressure is a form of stuffing technology.

Requirements for cast-in-place piles

SP 24.13330.2011 and SP 50-102-2003 contain a set of requirements that govern the construction of a pressed base:

1. Before designing the foundation, it is necessary to take into account the responsibility class of the structure.
2. Companies engaged in licensed activities can conduct geological surveys.
3. The procedure for engineering research is controlled by SNiP 11-02-96 (2016), SP 11-102-97, SP 11-104-97, SP 11-105-97.
4. During the design process, the impact of the design structure on the environment and the operating structures around the construction site is studied.
5. The quality of building materials used and the type of equipment must meet the requirements of the project and meet the technical specifications.
6. The calculation of a pressed foundation is based on the strength of the material and the bearing capacity of the soil. The calculations take into account the combined action of force factors and the negative influence of the external environment. Reliability factors when calculating loads are selected according to SNiP 2.01.07-85*.

The following table shows the requirements for piles’ load-bearing capacity for different uses:

Installation stages

Prior to beginning construction, the site must be cleared of construction debris and other items, building materials must be delivered, and the supply of water and electricity must be guaranteed.

When building a pile-rammed foundation, the following procedures must be followed in order:

1. Marking the territory: designating the perimeter of the structure and the places where the wells will be installed.
2. Construction of pits at the design depth.
3. Laying of casing pipe (if used). For private housing construction, metal pipes and corrugated rings can be used as extractable inventory. It is also possible to lay sheets of roofing felt rolled into a pipe in the wells, which will serve as a waterproofing layer.
4. Installation of the reinforcement frame and its device in the pit (when the foundation reinforcement technology is used).
5. Feeding the solution into the wells. It is advisable to use vibration equipment for maximum compaction of the solution. In handicraft production, pierce the barrel with a rod to remove air bubbles.
6. Alignment of protruding parts of supporting products at the same level horizontally.

Construction cost

The following represents the average market prices for the manual laying pile-cast foundation construction and the developer’s turnkey service.

The figures displayed are merely indicative, as the actual cost items will differ based on the starting circumstances in every individual instance.

This site contains all of the information you require regarding the layout and building of a pile foundation.

The process of constructing a pile-rammed foundation is methodical and intended to give structures sturdy support. To establish the right depth and kind of piles required, the state of the soil must first be evaluated. Then, using specialized equipment, piles are driven deeply into the ground until they reach rock layers or soil that can support loads.

To evenly distribute the building’s weight, a concrete cap or beam is built atop the piles after they are installed. This process makes sure the foundation is strong enough to support the structural loads that are applied to it over time. To make sure the foundation satisfies requirements for durability and safety, engineering calculations and site inspections are essential.

The quantity of piles needed, the state of the soil, and the size of the building all affect how much a pile-rammed foundation costs. Because pile driving and concrete work require specialized equipment and skilled labor, there is usually a significant upfront cost. Nonetheless, the foundation’s capacity to offer long-term stability and avert settlement problems frequently justifies this initial expense.

In conclusion, building a pile-rammed foundation has significant advantages in terms of structural integrity and longevity, despite requiring technical know-how and financial outlay. In order to guarantee a strong foundation that will support the building efficiently for many years to come, careful planning, engineering supervision, and adherence to building codes are crucial during the construction process.

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