FORM 2
THE PATENT ACT .197 0 (39 of 1970)
&
The Patents Rules, 2003 COMPLETE SPECIFICATION
(See Section 10, and rule 13)
1. TITLE OF INVENTION JOINT FOR AQUEDUCT TROUGH
2. APPLICANT(S)

a) Name : Mrs. GAURANGI HITENDRA CHANDEWAR
b) Nationality : INDIAN National
c) Address : "NISARG", PLOT NO. 138,
SHIVAJI NAGAR, NAGPUR - 440010, MAHARASHTRA, INDIA
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed : -

FIELD OF THE INVENTION
The present invention in general relates to the of joint for an aqueduct trough and in particular to the provision of water proof movement cum construction joint between the aqueduct trough segments. The present invention in particular relates to the provision of such water proof movement cum construction joint between the segments of aqueduct trough which will be maintenance free, durable and replaceable. This technology ensures technical viability and substantial savings in maintenance and repairing cost for the structure of aqueduct. Further, such type of joint can also be provided for any water retaining concrete structure.
BACKGROUND OF THE INVENTION
It is traditionally known that an aqueduct structure is constructed where the canal/carrier channel with gravity flow crosses over a big stream/river and where sufficient clearance of canal bed level (CBL) over stream/ river bed level (RBL) is available. An aqueduct structure is also required to be constructed in case of canal/carrier channel crossing over the road/railway/valley with sufficient soffit clearance. The structure may be Aqueduct or Syphon Aqueduct. If sufficient clearance for aqueduct trough to high flood level (HFL) of the stream is not available or HFL is above the soffit of trough, then the aqueduct is to be planned and designed as syphon aqueduct.
In aqueduct structure, the canal water is taken through the open or close masonry/concrete/steel trough. The trough runs on the pier to pier and pier to abutment at the ends. A bridge is generally constructed along with aqueduct trough which helps to take the canal side traffic across the stream. The canal water way in the trapezoidal form gets converged to rectangular/circular water way as per the shape of aqueduct trough. As significant loss of head of canal flow occurs in the entry and exit point of aqueduct, well designed transition structures are also to be provided at both the ends of trough. Aqueduct mainly consists of trough, bridge

structure as a super structure and abutment, pier, transition, pedestal/ column of approach riding deck as sub structure.
Aqueduct structure is more complex structure than the bridge as this structure takes canal water across stream and carries road over it. The water tightness of trough joints and free expansion-contractions of trough segment, canal water load on the trough, as well as traffic over the trough involves peculiar load combinations for which the super structure and sub-structure are required to be planned and designed.
The water resource is the State's subject, therefore, aqueduct structure is generally planned, designed and executed through Government Department using state's capital. Normally the cost of aqueduct structure ranges from minimum Rs 50 lakhs to several crores. If it is not designed by applying, optimally, various hydraulic theories applicable for open channel, then aqueduct trough design may become unplanned and may make the structure uneconomical as well as hydraulically non functional. This may put unnecessary financial burden on public exchequer
In large aqueduct structure, the aqueduct trough is multi-segmented. The trough segments are normally spanning over pier to pier/pier to abutment. Joint is normally provided over mid of pier/abutment cap. In cases of balanced cantilever trough segment, the joint is kept outside of cap. Joint has complete discontinuity in both reinforcement and concrete. The junction of transition wall and trough end is also a predominant joint in aqueduct structure. The joint also acts as a construction joint. In general, such a joint requires the provision of an initial gap between the two segments, which by closing or opening accommodates the expansion or contraction of the structure and movement of segments due to functioning of bearings.
The joint between the trough segment works as a movement joint and is intended to accommodate relative movement between adjoining segments of aqueduct trough. A movement joint has no restraint to movement and is intended to accommodate

either expansion or contraction of aqueduct trough. The trough segments transfer the load over trough through bearings to cap of pier/abutment. As the aqueduct trough carries water, special provision is required to maintain the water-tightness of the joint.
PRIOR ART:
Indian Standards (IS) 7784 (part 1/sec 1) section 11.1 recommends water stops for joint of cross drainage work. The water stops shall be used in and across all joints where leakages are detrimental to structural safety or the water needs are to be conserved. In case of aqueduct, well designed joint between two segments of trough and at the junction of transition and RCC trough, both in the floor and side walls are to be provided.
Indian Standards Code, IS 7784 (part 2/sec 1) 1995, states that joints should be provided across and along the drainage barrel length. The maximum spacing of these joints in either direction should be limited to 20 m. A gap of 15 mm with water stops at all the joints across and along the barrel should be provided to accommodate the movements. In case of multi barrels, units of three or four barrels can be adopted side by side with longitudinal joints having water stops all around. In case, canal trough is supported on separate piers, expansion joints of sufficient width shall be provided in the trough at the centre of the piers.
IS 3370 (part 1), 2009, gives guidelines and requirements for movement and construction joints in liquid retaining structure. The joint in the trough type aqueduct is normally expansion type of movement joint. The same joint shall be treated as construction joint during construction of trough segments. The requirements of movement joint and construction joint along with schematic figures are well explained in IS 3370 (part 1). Many books/manuals have given the details of various joints for other structures, which cannot be directly used for the trough segments.

OBJECTS OF THE INVENTION:
The principal object of the present invention is to provide water proof, movement cum construction joint between segments of aqueduct trough adapted to hydraulic and structural function in a technically sacrosanct manner.
The further object of the present invention is to provide such water proof movement cum construction joint between segments of aqueduct trough which is maintenance free, durable and replaceable.
It is another object of the present invention to provide joint for accommodating repeated movement of the aqueduct trough segment without loss of water tightness. The movement of trough segment and bearings due to imposed load, movement due to seismic load, movement due to expansion and contraction or movement due to buoyancy effect as in case of syphon aqueduct. The joint enables to maintain water tightness in a technically sound manner whilst accommodating relative movement of aqueduct trough on either side.
It is further object of the present invention to provide such elastic material of the joint which does not suffer permanent distortion or extrusion and does not get displace by fluid pressure and does not slump unduly in hot weather or become brittle in cold weather.
It is yet another object of the present invention is to provide such materials for joint which are non-toxic and corrosion resistant to chemical and biological action.
How the foregoing objects are achieved and the other aspects of the present invention, will be clear from the following description which is purely by way of understanding and not by way of any sort of limitation.

SUMMARY OF THE INVENTION
Accordingly, the present invention provides water proof, movement cum construction joint between segments of aqueduct trough for efficient hydraulic and structural functioning.
In accordance with preferred embodiments of the aqueduct structure of the present invention:
The joint acts as expansion, construction and water proof joint. The joint is durable, easy to install and easy to maintain. During the course of life of aqueduct if the leakages or seepages are found in particular location of joint; the same can be stopped by tightening the nuts of securing bolt at that location. The joint assembly is so placed and so designed that the water bar or any other component suffer distortion, the same can be easily replaced.
The developed joint of aqueduct trough in the present work satisfies all the requirements of aqueduct joint as elaborated above.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The nature and scope of the present invention, will be better understood from the accompanying drawings, which are by way of illustration of some preferred embodiments and not by way of any sort of limitation. In the accompanying drawings,
Figure: 1 shows the layout of trough which shows the location of joint between segments of aqueduct trough and joint between the end of trough and transition wall (preferred embodiment)
Figure: 2 illustrates profile of joint in cross section of aqueduct trough.

Figure: 3 depicts details of components of joint, as incorporated in an aqueduct trough segments according to the present invention.
With reference to Figure 3, Following table gives the details of components of joint and function of each component.
Table 1: Details of Components of Joint

Comp Name of Size/ Material Function
onent Component dimension
No. (mm)
(1) (2) (3) (4) (5)
1 Leveller lto2 Wall care To provide smooth and levelled
coating white cement powder
putty surface for PVC water bar
2 Securing nut- 12 mm dia Stainless To fasten and to clamp the
Bolt steel water bars firmly and to hold the water bar in position with trough.
3 Joint filers/ 25 mm Dense To provide gap of 25 mm for the
spacer pad thick and bitumen construction purpose and for
width pad or the relative movement of trough
equal to thermo due to bearings and expansion-
thickness of trough segment coal sheet contraction of trough.
4 Water bars* 8mm Poly vinyl To provide water-tight seal
with grippers thick, 220 chloride during the whole range of joint
on wings and mm wide (PVC). movement and to accommodate
central bulb (with bulb
of 20 mm
dia OD, 8
mm dia ID,
Wings on
either side
have 4-6
grippers of
1-2 mm
height) the movement of trough segment.

5
Clamp plate 5mm Corrosion To clamp the PVC water bar to
thick, 75 resistant make the joint water tight and to
mm wide steel (CRS) hold the water bar in position.
6 Joint sealing - Acrylic Seals the air gap between putty
compound based
water
proof
chemical finished surface and water bar.
7 Mortar cover Cement-sand mortar with
propylene fibre To protect the water bar and to fill the open face of template up to the inner face of trough.
8 Expansion gap 25 mm - To accommodate the movement of aqueduct trough.
9 Concrete 30 mm - To accommodate the joint
template groove xl25mm assembly.
10 Surface - Acrylic To seal shrinkage cracks in the
treatment water
proof
chemical mortar coating and to protect mortar cover.
Note:
1. All dimensions are in millimetres.
2. The fabrication work confirms to IS 800.
3. *Dimension and specification varies with manufacturer and field requirement.

I CLAIM:
1. A water proof movement cum construction joint between segments of aqueduct trough consisting of Leveller putty coating (1) on PVC water bar (4) of suitable width and thickness with central hollow bulb of suitable outer and inner diameter which accommodates the transverse and longitudinal movement up to 10 mm without distortion having central bulb and wings of water to accommodate movement of trough due to expansion, contraction with Gripper on wings , a Clamp plate hole (5) for clamping the PVC water body with gripper effectively and make the joint water tight having Stainless steel securing nut and bolt (2) of suitable length at certain mm c/c for securing components rigidly fixed in concrete which makes it durable, long lasting;
a joint filler / spacer (3) bar with 25 mm gap between trough segments to be maintained putting dense bitumen sheet or thermo coal sheet; a joint filler with Joint sealing compound (6) of acrylic base water proof chemical, which fills the air gap at end of water bar and makes the joint more water proof;
a joint filler with Cement mortar cover (7) with cement sand mortar and propylene fibre on the joint assembly which protects the water bar and fills the open face of template up to the inner concrete profile of trough segment; and
a joint filler with Concrete template groove (9) provided to accommodate the joint assembly.