Pile Casting & Driving Works

About Pile:
A pile is a long cylinder of a strong material such as concrete that is pushed into the ground to act as steady support for structures built on top of it.

Pile foundations are used in the following situations:

• When there is a layer of weak soil at the surface. This layer cannot support the weight of the building, so loads of the building have to bypass this layer and be transferred to the layer of stronger soil or rock that is below the weak layer.
• When a building has very heavy, concentrated loads, such as in a high-rise structure, bridge, or water tank.

Pile foundations are capable of taking higher loads than spread footings.

Knit Consult & Engineering Specializes in providing complete solutions including consulting, design, and construction of high-quality concrete piles. Since its establishment in 2007, Knit Consult & Engineering has implemented a huge number of pile casting & Drive works across Bangladesh.

A. Pre-cast Concrete Pile

The precast concrete pile is cast in a pile bed in the horizontal form if they are rectangular. Usually, circular piles are cast in vertical forms. Precast piles are usually reinforced with steel to prevent breakage during their mobilization from the casting bed to the location of the foundation. After the piles are cast, curing has to be performed as per specification. Generally curing period for pre-cast piles is 21 to 28 days.

Benefits of Pre-cast Piles

• Precast concrete piles compact the soil. Therefore, the main advantage of using these piles is increasing the bearing capacity of the soil.
• These piles can be made in various sizes, shapes, and lengths and used at the site. As a result, the progress of project work will be faster.
• The position of the reinforcement in these piles is not disturbed from its original position.
• The construction of these piles can be well supervised, and any defect detected can be rectified before use.
• The Precast Concrete Piles can also be driven underwater.
• Precast piles can be immediately loaded after they have been driven.
• The driving of an adjacent pile does not produce an adverse effect on the already driven piles.
• These piles are highly resistant to the biological and chemical action of the subsoil.
• No waste generation on the site.
• It is not affected by the groundwater.
• It is the most economical form of deep foundation
• Precast concrete piles can withstand high-pressure vertical loads as well as high tension loads.

B. Cast in situ pile

To cast the pile concrete boring a specified depth of soil at the site of the pile is called cast in situ pile. In this piling system, the pile is made in the place where it is placed. This is why no impact or hydraulic pressure is required for the placement of the pile.

The benefits of the cast in situ pile

• This pile is made according to the actual length of the boring soil. So, a lot of time and money are saved in this piling system.
• During the placement of the pile, no hydraulic and impact pressures are required; as a result, perfection can easily be maintained.
• Transportation cost is zero.
• No time is required for the curing.
• Increasing the diameter of drilling shaft heavy load capacity pile can be made Like pedestal pile.
• As the length of the pile and carrying capacity soil is previously known in this piling system, an exact pile can easily be designed.

C. Screw piles (Solar Power Plant)

Screw piles are a type of deep foundation that can be installed quickly with minimal noise and vibration. Screw piles are wound into the ground; much like a screw is wound into the wood. This is an efficient means of installation and coupled with their mechanism of dispersing load, provides effective in-ground performance in a range of soils, including earthquake zones with liquefaction potential. The piles are made of circular hollow steel sections with one or more helices attached to them. Screw piles cut into the soil following a constant pitch, as opposed to auguring through it. The helical flights and shafts are specifically designed to suit the ground conditions. Once the pile has reached the target depth it remains permanently in place and is typically filled with concrete. The protruding reinforcing provides the connection to the building structure above, and can in some cases increase the capacity of the pile.

Benefits of screw pile

• Rapid Installation
• Immediate Load Carrying Capability
• Minimal Site Disturbance
• Easy to install at Remote Locations or Sites with Limited Access
• Installation in High Groundwater Conditions
• Easy Installation on a Batter
• Simple Field Modifications to Increase Load Capacity

D. Sand Piles

Sand compaction piles are one of the potential methods for improving ground stability, preventing liquefaction, reducing settlement, and similar applications. This method involves driving a hollow steel pipe into the ground. The bottom is closed with a collapsible plate down to the required depth and then the pipe is filled with sand. The pipe is withdrawn while the air pressure is directed against the sand inside it. The bottom plate opens during withdrawal and the sand backfills the voids created earlier during the driving of the pipe. The sand backfill prevents the soil surrounding the compaction pipe from collapsing as the pipe is withdrawn. During this process, the soil gets densified.

There are two types of Sand compaction piles method depending on the system deployed. The first one is the vibratory system with Vibro-hammer and the other one has a non-vibratory system with forced lifting or driving device. But the Vibro-hammer used in this method has a negative effect in the form of vibration and noise to the surrounding environment which makes it difficult to use this method in urban areas or at locations close to existing structures. To avoid these problems, a system with a non-vibratory Sand compaction pile method was developed, which does not require impact or vibration on the driving device to penetrate the ground. The equipment consists mainly of a sand compaction pile-driving device used as a base machine and a forced lifting or driving device with a rotary drive motor to rotate the casing pipe.

E. Shore Piles

This type of pile is mostly used to provide lateral support. Usually, they resist lateral pressure from loose soil. They are usually used to serve the following purpose-

• Construction of Basement of a Building.
• Retain the loose soil around foundation trenches.
• For confinement of soil and thus increase the bearing capacity of the soil.

F. Sheet Piles

This type of pile is mostly used to provide lateral support. Usually, they resist lateral pressure from loose soil, the flow of water, etc. They are usually used for cofferdams, trench sheeting, shore protection, etc. They are not used for providing vertical support to the structure. They are usually used to serve the following purpose-

• Construction of retaining walls.
• Protection from riverbank erosion.
• Retain the loose soil around foundation trenches.
• For isolation of foundation from adjacent soils.
• For confinement of soil and thus increase the bearing capacity of the soil.