Under which conditions we can go for well foundation?
Under which conditions we can go for well foundation?
Well Foundation is used to provide greater stability to a structure in the circumstances where the velocity of water is high and the depth of water is higher than 5 to 6 m and where no other type of foundation can be used.
What is well sinking method?
process of taking down the well to the founding level is known as well sinking. The well shall be sunk down by excavating material uniformly from inside the dredge hole. Use of water jetting, explosives & divers may be adopted for sinking of well through difficult strata.
Which are the problems that can arise during well sinking?
Obstruction on one side of well. Sand blowing in well during sinking causing sudden sinking. Deposition of dredged material on one side of well causing unequal earth pressure. Sudden sinking due to blasting.
What is well Steining?
Well Steining: Steining is a wall or shall type of structure made up of RCC, and which helps to transfer the load to the curb. It serves as an enclosure for excavating the soil for the penetration of the foundation well.
Is well foundation a deep foundation?
Well foundation is a type of deep foundation which is generally provided below the water level for bridges.
What are the different types of well foundation?
Shapes of Well Foundations:
- Circular.
- Twin circular.
- Square/Rectangular.
- Double D.
- Hexagonal/Octagonal.
How well foundation is constructed?
Well foundations are constructed in stages by sinking under self-weight as well as dredging the soil inside the dredge hole and on the sides outside. The first step in the construction of a well foundation is to lay the cutting edge and well curb.
How do you fix a tilt and shift of a well foundation?
Rectifying methods for Rectification of shifting and tilting problems in well foundations are as follows: Eccentric loading. Excavation on higher side. Water jetting….
- Eccentric loading.
- Excavation on Higher Side.
- Water Jetting.
- Pulling the Well.
- Pushing using Jacks.
- Using Struts.
- Excavation under Cutting Edge.
What is bottom plug of well foundation?
A bottom plug is a bridge or cement seal placed near the bottom of the well in order to shut it off. After the well is sunk to the required depth, the base of the well is plugged with concrete. This is called a bottom plug.
Why sand is filled in well foundation?
Sand Filling – Sand filling provide stability of well, reduce tensile stress produced by bending moment and distributes the load of super structure on to the bottom plug. Sand filling relieves load to steining to some extent.
Where well foundation is suitable?
Well foundation is a type of deep foundation which is generally provided below the water level for bridges. Cassions or well have been in use for foundations of bridges and other structures since Roman and Mughal periods.
What are the types of well foundations?
What are the common problems encountered while sinking a well?
Generally the following problems are encountered while sinking a well. Tilt and Shift- Adopt the following measures if tilt exceeds 1/60. Dredge at the higher side. Not effective at greater depths. This is shown in Fig.3 and 4 below.
How the sinking of the well Foundation is done?
The Sinking of the Well Foundation is carried out through the following Steps. In dry ground excavate up to 50 cm in river bed and place the cutting edge at the required position.
How do you build a well that will sink?
Construction of Well Steining, Sinking of the Well Foundation The steining should be built in short height of 1.5 m initially and 3 m after a 6 m grip length is achieved. The verticality should be maintained. The aim of the well sinking is to sink the well vertically and at the correct position.
What precautions should be taken during well sinking?
The verticality should be maintained. The aim of the well sinking is to sink the well vertically and at the correct position. The following precautions are to be taken as far as possible. The following precautions should be taken during well sinking. Outer surface should be regular and smooth.