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Caisson Foundation | Use of Caisson Foundation | Type of Caisson Foundation | Advantages & Disdvantagesof Caisson Foundation

Caisson Foundation (4)

Table of Contents

  • Caisson Foundation
  • Use of Caisson Foundation
  • Advantages of Caisson Foundation
  • Disadvantage of the Caisson Foundation
  • Component Part of Open Caisson
    • 1. Cutting Edge
    • 2. Curb
    • 3. Staining
    • 4. Bottom Plug
    • 5. Sand Filling
    • 6. Intermediate Plug and Top Plug
    • 7. Cap
  • Type of Caisson Foundation
    • 1. Open Caisson
      • 1.1. Single Wall Open Caisson
      • 1.2. Cylindrical Open Caisson
      • 1.3. Open Caisson with Dredging Well
    • 2. Box Caisson
    • 3. Pneumatic Caisson
    • What Is Concrete Caisson Foundation?
    • Caisson Footing
    • Caisson Foundation
    • Caisson Construction
    • Caisson Construction Method
    • Caisson Structure
    • Steel Caissons
    • How Does a Caisson Work?

Caisson Foundation

The caisson foundation is also called the deep foundation. Caisson means box, which is derived from the french word caisse. The caisson foundation is mainly done underwater. Caisson foundation is excavated before or after excavation.

The caisson foundation is mainly used of wood, RCC, and cast iron. There is a possibility of fire and erosion in the wooden caisson. So the caisson of wood is not especially used.

The caisson foundation is used as a foundation in the pier of the river bridge. Where dewatering is not possible caisson foundation should be done.

Use of Caisson Foundation

  1. Doing caisson foundation gives a man a place to work.
  2. Doing caisson foundation protects against bases and forces.
  3. Dewatering is difficult; there is a useful caisson foundation.
  4. The caisson foundation is economical when the depth is more than 12 mt.
  5. The caisson foundation is useful where the river flow is high, and the water depth is high.
  6. Caisson foundation can be embedded at any spot.

Also Read : What is Mat Foundation? | What Is Mat Foundation Used For? |Types of Mat Foundation | Construction of Mat Foundations |

Advantages of Caisson Foundation

Advantages of Caisson Foundation

  1. Doing caisson foundation gives a man a place to work.
  2. Doing caisson foundation protects against bases and forces.
  3. Dewatering is difficult; there is a useful caisson foundation.
  4. The caisson foundation is economical when the depth is more than 12 mt.
  5. The caisson foundation is useful where the river flow is high, and the water depth is high.
  6. Caisson foundation can be embedded at any spot.

Also Read : What Is Gable Roof? | Design of Gable Roof | Types of Gable Roofs | Advantage & Disadvantage of Gable Roof

Disadvantage of the Caisson Foundation

disadvantage of the Caisson Foundation

  1. In a shallow foundation, the caisson foundation costs more.
  2. The caisson foundation is permanent,  so it cannot be used a second time.
  3. In the caisson foundation, the air pressure has to increase as the depth increases.
  4. Due to the high air pressure in the caisson foundation, the efficiency of man decreases.
  5. High pressure of air in caisson foundation harms human health.
  6. Caisson foundation is not used for depths greater than 35 mt
  7. the caisson foundation needs specialists.
  8. The caisson foundation needs a skilled carpenter.
  9. The caisson foundation is very tedious and time-consuming.

Also Read : What Is Lean to Roof? | Composition of Lean to Roof | Important Notes for Construction of Lean to Roof | Advantage & Disadvantage of Lean to Roof | Roofing Materials Suitable for Lean to Roof

Component Part of Open Caisson

1. Cutting Edge

The wall of the caisson is thick. So the cutting edge is placed at the bottom of the caisson. So that the soil is easily trimmed and the right level transferred. The cutting edge is made of iron.

2. Curb

1.0 mt to 1.5mt height of the cutting edge to the caisson wall, whose thickness gradually increases and becomes equal to the caisson wall.

The shape of the curb is triangular, which gives big space for excavation.

3. Staining

This wall starts from the curb to the height of the ground. It is made of masonry. Masonry walled caisson is used for the base in special circumstances.

The wall thickness is kept at 30 cm to 90 cm. The concrete wall is used more.

Also Read : What Is Beam? | What Is Column? | Difference Between Beam and Column

4. Bottom Plug

When the required depth is reached, the area is leveled and concreted.

When concrete is to be used in water, 10% more cement should be used in the bottom plug, making the foundation stronger.

5. Sand Filling

The sand filling is done in the middle of the caisson to increase the weight of the caisson.

6. Intermediate Plug and Top Plug

After sand filling, concrete is applied ON it. Its thickness is 30 cm to 45 cm. The base of the bridge is filled with sand up to the top. And concrete is made on it, which is called top PLUG.

7. Cap

Concrete is made in the same diameter as the caisson wall, which is called top cap.

Also Read : What Is Parapet Wall? | The Need of Parapet Wall | Uses of Parapet Wall | Types of Parapet Wall | Importance Notes for Parapet Wall Construction

Type of Caisson Foundation

Type of Caisson Foundation (3)

 

The type of caisson depends on things like size, shape, depth, and type of construction, etc. There are three types of caisson which are as follows,

  • Open Caisson.
  • Box Caisson.
  • Pneumatic Caisson.

1. Open Caisson

This type of caisson is open from both the top and the bottom. The open caisson is a box-shaped structure. Open caisson is more used where shallow bases are to be made. This type of foundation should have dry soil conditions.

This type of caisson has vertical walls. This type of caisson has a cutting edge at the bottom so that the earth can be cut easily. The open caisson is divided into three parts.

Also Read : What Is False Work? | Types of Falsework | Causes of Falsework Failures

1.1. Single Wall Open Caisson

This type of caisson is used for shallow depths and is used where the soil is loose.

1.2. Cylindrical Open Caisson

This type of caisson is used for high depths and is used where the area of the caisson is large.

1.3. Open Caisson with Dredging Well

This type of caisson is used for greater depth. The foundations of this type of caisson are used to construct the foundations of the bridge’s pier. This caisson is used to prevent erosion of the base from flowing water flow.

Also Read : What Is Oblique Drawing? | Oblique Projection | Procedure for Oblique Drawing – Example | Types of Oblique Drawing

2. Box Caisson

This type of caisson is similar to an open caisson. But the bottom of this caisson is closed.This type of caisson is made of R.C.C or steel.In this type of caisson, the ground should be level, and the space, where the foundation is laid, should have sufficient ground stability.

When a foundation is laid in a river, the sand is removed to a certain depth. The land is then leveled. After doing the above, the caisson is shuttered on the ground and concrete. Curing is then done on the site.

Where necessary, it is tied with a rope and dragged to the right place to sink. Dipping the caisson at the designated place increases the weight of sand or concrete in the space of the caisson.

A concrete cap is filled over the head of the caisson then the construction of a superstructure is started on it.

Also Read : What Is Cedar Wood? | Uses of Cedarwood | Type of Cedarwood | Advantage & Disadvantageof Cedarwood

3. Pneumatic Caisson

The peculiarity of this type of caisson is the excavation that is done for its sinking. It occurs in the open, which is made possible by the special composition of the caisson.

It is not advisable to dig in the water and sink the caisson when uneven hard surfaces occur during excavation. If this is done, the caisson will sag. And it takes time, money, and special technique to straighten it out.

Pneumatic caisson is used when it is difficult to dispose of water. Pneumatic caisson is used when there is variation in soil levels.

Pneumatic caisson is used when layers with higher bearing capacity are located at greater depths. Pneumatic caisson is used when unable to use another type of caisson.

Also Read : What Is Shoring? | What does Shoring Mean? | What Is the Use of Shoring? | Type of Shoring


FAQ

What Is Concrete Caisson Foundation?

Concrete caisson foundations, also known as concrete pier foundations, are prefabricated hollow substructures designed to be constructed on or near the surface of the ground, sunk to the desired depth and then filled with concrete, thus ultimately becoming an integral part of the permanent structure.

Caisson Footing

A caisson foundation also called as pier foundation is a watertight retaining structure used as a bridge pier, in the construction of a concrete dam, or for the repair of ships.

Caisson Foundation

Caisson foundations is a form of deep foundation that is built above ground level, then submerged to the required level by excavating or dredging material within the caisson; Caisson (sometimes called “piers”) are made by auguring a deep hole in the ground then filled with concrete, it is also known as pier foundation.

Caisson Construction

In geotechnical engineering, a caisson is a watertight retaining structure used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, or for the repair.

Caisson Construction Method

It is a form of deep foundation which are constructed above ground level, then sunk to the required level by excavating or dredging material from within the caisson. Caissons (also sometimes called “piers”) are created by auguring a deep hole into the ground, and then filling it with concrete.

Caisson Structure

A caisson is a box-like structure commonly used in civil engineering projects where work is being carried out in areas submerged in water. Such projects might include: Bridge piers. Abutments in lakes and rivers.

Steel Caissons

A steel caisson is a large diameter steel pipe that is a watertight chamber used in underground consttuction to hold back water and soil. Typically it is filled with rebar and concrete. Arntzen Corporation produces quality large diameter caissons for drilling foundation contractors.

How Does a Caisson Work?

Workers, called sandhogs, move mud and rock debris (called muck) from the edge of the workspace to a water-filled pit, connected by a tube (called the muck tube) to the surface. When the caisson hits bedrock, the sandhogs exit through the airlock and fill the box with concrete, forming a solid foundation pier.

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