Mumbai University > Civil Engineering > Sem 8 > Design and Drawing of Reinforced Concrete Structure

Marks : 10

Year : MAY 2012

The joints of water tank are majorly divided into 3 types:

1) Movement joints

2) Construction joints

3) Temporary open joints

1) Movement joints: Special types of materials are required to maintain water tightness while accommodating relative movement between the side of joints. Movement joints are of 3 types:-

Movement Joint

i. Contraction joints: - A contraction joint is a typical movement joint which accommodates the contraction of the concrete.

-It is of 2 types: - complete contraction joint- discontinuity of both steel and concrete

Partial contraction joint- discontinuity of concrete only

• These are usually applied after construction or just before the reservoir is put into service by pouring in hot & cold state.

ii. Expansion joints: - It is a movement joint with complete discontinuity in both reinforcement and is intended to accommodate either expansion or contraction of the structure

• Joint fillers are used to fill the initial gap provided in the joint and are usually a compressible sheet or strip materials used as spaces.

  

iii. Sliding joint: - Sliding joint is a movement joint with complete discontinuity in both reinforcement and concrete at which special provision is made to facilitate relative movement in place of the joint.

-This joint is provided between wall & floor in some cylinder tank designs

2) Construction joints: - A construction joint is a joint in the concrete introduced for convenience in construction at which special measures are taken to achieve subsequent continuity without provision for further relative movement.

3) Temporary open joints:- A temporary open joint is a gap temporarily left between the concrete of adjoining parts of a structure which after a suitable interval and before the structure is put into use, is filled with mortar or concrete completely or provided below with the inclusion of jointing material.