FIELD OF INVENTION

[0001] The embodiment herein generally relates to an application of sleeved column. More specifically, the invention provides a sleeved column staging support for constructing a water storage tank. Further, the invention utilizes a buckling restraint braces for designing the sleeved column staging support for constructing a water storage tank.

BACKGROUND AND PRIOR ART

[0002] Sleeved column is an innovative concept in building construction field. Fig. la illustrates a side sectional view 100a of the sleeved column concept clearly. Mainly, the sleeved column may consist of a core 101 placed inside a sleeve 102 with a small gap between core and the sleeve 102 so that no axial load is transferred from the core to the sleeve 102. Fig. lb illustrates a cross section view 100b of the sleeved column concept clearly. The core 101 is designed in such a way to carry the full axial load at the yield strength. Further, the sleeve 102 is designed as a high stiffness element with an adequate buckling capacity. Fig. lc illustrates behavior 100c of the sleeved column under loading condition. As a system, the axial load is resisted by the core alone while the necessary flexural stiffness is provided by the sleeve. Now the axially loaded core behaves as a compression member with continuous lateral support given by the sleeve. The sleeve can resist the bending stresses and shear stresses that may arise due to the contact of the core with the sleeve when the core buckles.

[0003] As the axial strength requirement and flexural stiffness requirement are bifurcated in the system, advantage can be gained by using high strength material which has a lower cost/strength ratio as core, which resists the axial load and high stiffness element viz., a very thin tube of a larger diameter made of lower yield material as sleeve. The system can be designed such that : Q - A factor greater that 1 (say 1.2), to take care of initial imperfections and residual stress effects of core.

I - moment of inertia of sleeve

L - Effective unsupported length of sleeve

A _c - Area of core.

Gyc - Yield stress of core material

E - Modulus of elasticity of material

[0004] The use of high strength steel may result in a smaller core size and the required high stiffness for the sleeve may result in a larger diameter sleeve, resulting in a large gap between the core and the sleeve. This gap between the core and the sleeve can be filled with an inert material such as grout 103, ensuring that the bond between the grout 103 material and the core in the longitudinal direction is broken. The grout in contact with sleeve also precludes the local buckling of thin- walled sleeves. As a combined system the Sleeved Column Systems supports much higher load than the conventional systems. 'Even discontinuous core pieces can be used to support axial compressive loads effectively'.

[0005] In the prior art, some systems and methods are developed by analysis and as well as developing optimum design for sleeved column systems. The sleeved column can be a core loaded system. Fig. 2a illustrates a side sectional view 200a of typical sample of core loaded system. The core loaded system includes a plurality of core 201, a sleeve 202, grout material 203 and at least two loading lug 204. Fig. 2b illustrates a cross section 200b of a typical sample of core loaded system In the core loaded system, the compressive load is directly applied to the core 201 alone and no axial load is carried by the sleeve 202. As the sleeve does not carry any axial load, presence of imperfection, residual stresses and so on of sleeve does not adversely affect the load carrying capacity of the system. Typical applications of this system can be in Shuttering Props, Crane booms, bull dozers arms and so on. Many tests are conducted in the core loaded system. In the initial tests, the effect of gap between core and sleeve on the load carrying capacity was studied by creating predetermined gaps between the inert material surrounding the core and the sleeve. The load carrying capacity of the sample decreased with increase of gap. In all the tests the samples failed at loads lesser than their yield capacity. In the later tests very little gap (of the order of 0.5 mm) was created between the core and the sleeve. In all these tests, the failure was after yielding of the core 201 material. Based on these samples tests, a 3.0 meter high prototype model made out of laced sleeved column system was fabricated and tested. The prototype failed at a load of 578 KN which is close to the yield capacity of the core material. A Bull Dozer arm based on the above principle was also tested. The samples and the prototype tested worked out 25 to 40% cheaper than the conventional systems for I/r ratios upto and below 70. So a core cum sleeve loaded system is developed in order to obtain full yield capacity. Hence there exists a need to develop a design for utilizing the core cum sleeve loaded system in tower like structures to use the property of full yield strength.

[0006] In general, a water tank is basically a storage device or a big container used to store water. The water tank is usually utilized in providing sufficient and ready to use water in lots of different sorts of usages like for drinking water, agriculture, irrigational activities, cooking, suppression of fire, cooking, maintenance of flora and fauna, medical purposes, manufacture of chemicals, etc. All these uses require a steady flow of water in order to be completed successfully and a water tank is the perfect solution for the same. The different aspects concerning a water tank, upon which the resultant end product, i.e. water depends are the types of construction materials and linings used to make the water tank and also the design of the water tank. The different types of materials generally used to create a water tank are stone, steel, plastics, concrete and fiberglass.

[0007] The most common form of water tank, generally used to serve both industries as well as homes is an elevated water tank or a water tower. The mechanism generally works on the basis of pressure created at the ground level outlet at the rate of 1 psi per 2.31 feet of elevation. Hence, a water tank elevated to 70 feet above the ground creates a discharge pressure of around 30 psi, which is generally sufficient for most types of household and industrial requirements.

[0008] Typically, water is required to be stored in huge volumes in order to meet the industrial or municipal demands conforming to the standards of the regulatory authorities governing the same. A huge volume of water is bound to yield a huge mass and is hence, stored in elevated places to negate the need for pumping as the same is governed by gravity. Such elevated water tanks also run the risk of resonance which can be attributed to seismic vibration. Also, water oscillation and induced waves increase the risk of a collapse during an earthquake. Severe damage to a water tank carries the risk of spillage and water runoff in case of an earthquake, depending on the level of severity associated with the same. The severity of damage usually depends on the quality of construction, maintenance of the basic structure and supporting structures, the standard of design of the water tank, magnitude of the earthquake and also the amount of site amplification conducted. The damages caused to water tanks also include unavailability of water for standard or regular usage, causing immense problems to the general public and also leading to enormous increase in prices of available water in such places. The large amount of spillage of water also leads to the localities affected by the earthquake to suffer from water scarcity and illnesses associated with stagnancy of water. The effects of an earthquake are hence, amplified by the collapse of the water tank and this causes a lot of other issues also to the common mass and the industries served by such tanks.

[0009] Therefore, there is a need to develop a sleeved column staging support for constructing a water storage tank to provide a seismic resistant structure. Further, there is a need to develop a staging structure for constructing a water tank in a simple manner and also capable to withstand stress due to any natural disasters.

OBJECTS OF THE INVENTION

[00010] Some of the objects of the present disclosure are described herein below: [00011] A main object of the present invention is to provide a sleeved column staging support for constructing a water storage tank.

[00012] Another object of the present invention is to provide a sleeved column that includes a plurality of HT stand core with a predefined thickness placed inside a MS circular tube to form a staged support for constructing the water storage tank.

[00013] Still another object of the present invention is to provide a sleeved column that includes a plurality of MS plate with plurality of holes on it to hold the HT stand core firmly to support the water storage tank.

[00014] Another object of the present invention is to provide a sleeved column that can be filed with a cement grout to balance the load of the water storage tank.

[00015] Another object of the present invention is to provide a sleeved column that includes a cement grouted MS circular pipe to support the water storage tank.

[00016] Another object of the present invention is to provide a sleeved column staging support to construct the water storage tank capable for withstanding stress due to any natural disasters.

[00017] Another object of the present invention is to provide a staging support using a plurality of MS tube for constructing the water storage tank.

[00018] The other objects and advantages of the present invention will be apparent from the following description when read in conjunction with the accompanying drawings, which are incorporated for illustration of preferred embodiments of the present invention and are not intended to limit the scope thereof.

SUMMARY OF THE INVENTION

[00019] In view of the foregoing, an embodiment herein provides a sleeved column staging support for a water storage tank. The sleeved column staging support for constructing a water storage tank comprises of, a plurality of sleeved column, a plurality of MS tube of predefined size, at least one MS plate of predefined thickness to cover a base of the water storage tank. The plurality of sleeved column can be supported by a cementitious structure that is formed at a ground level to form a sleeved column structure. The plurality of MS tube of predefined size can connect the plurality of sleeved column to construct the staged support for the water storage tank. Further, the sleeved column includes a plurality of a MS circular pipe, a plurality of HT stand core, and a plurality of intermediate MS plate with a plurality of holes.

[00020] According to an embodiment, the plurality of HT stand core with a predefined thickness may get placed inside the MS circular tube to form a staged support for constructing the water storage tank. The plurality of intermediate MS plate with the plurality of holes can be placed inside the MS circular pipe at places, where the MS tubes are not connected to the sleeved column. The plurality of the HT stand core inserted through the plurality of holes provided in the intermediate MS plate. The MS circular pipe can also be grouted with cement material to render enough compressive strength to the sleeved column to resist damage. The sleeved columns can be placed in corners of the staged support and can be welded to the base of the MS plate of predefined thickness. The sleeved columns can be connected by the plurality of MS tube to form a staircase structure overlapped with a zigzag positioned MS tubes on each side of the staged support thereby to distribute a load evenly to the sleeved columns. A predefined size of the MS circular pipe, the HT stand core, and the intermediate MS plate utilized based on a storage capacity of the water storage tank.

[00021] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS

[00022] The detailed description is set forth with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different figures indicates similar or identical items.

[00023] Fig. la illustrates a side sectional view of the sleeved column concept, according to the prior art herein;

[00024] Fig. lb illustrates a cross sectional view of the sleeved column concept, according to the prior art herein;

[00025] Fig. lc illustrates a behavior of the sleeved column under loading condition, according to the prior art herein;

[00026] Fig.2a illustrates a side sectional view of typical sample of core loaded system, according to the prior art herein;

[00027] Fig.2b illustrates a cross sectional view of typical sample of core loaded system, according to the prior art herein;

[00028] Fig.3 illustrates a sleeved column staging support for constructing a water storage tank, according to an embodiment of the present invention herein;

[00029] Fig. 4 illustrates a cross section of the single sleeved column, according to an embodiment of the present invention herein;

[00030] Fig. 5 illustrates a vertical sectional view of the single sleeved column at section BB', according to an embodiment of the present invention herein; and

[00031] Fig. 6 illustrates a plan view of the sleeved column staging support for constructing a water storage tank at section AA', according to an embodiment of the present invention herein.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[00032] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

[00033] As mentioned above, there is a need to develop a staging support for constructing a water storage tank to provide a seismic resistant structure. The embodiments herein achieve this by providing a sleeved column staging support for constructing a water storage tank. Referring now to the drawings, and more particularly to FIGS. 1 through 6, where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments.

[00034] According to an embodiment, for some systems such as water tank staging, off-shore platforms, tower cranes, towers of suspension bridges, micro wave towers and so on, the system carries varied values of axial load over its height due to wind/earthquake loads /wave loads. To cater for these applications, tests have been designed to study the behavior and determine the load carrying capacity of the system in which sleeve also carries a fraction of the axial load. A predetermined number of tests are conducted in which the core was axially compressed while the sleeve was independently subjected to various levels of axial force in the range of its tension to compression capacity. It was found that core could be loaded to its full yield capacity before overall failure by buckling of the sleeve. However the sleeve stiffness required for these systems was higher than that of core loaded system.

[00035] Fig.3 illustrates a sleeved column staging support 300 for constructing a water storage tank, according to an embodiment of the present invention. The sleeved column 309 staging support for constructing a water storage tank 301 comprises of, a plurality of sleeved column 309, a plurality of MS (Mild Steel) tube of predefined size (for example 25.4x2 mm thickness), at least one MS plate 302 of predefined thickness (for example 16 mm thickness) to cover a base of the water storage tank 301. The plurality of sleeved column 309 can be supported by a cementitious structure 312 that is formed at a ground level 311 to form a sleeved column structure 309. The plurality of MS tube 308 of predefined size (for example 25.4x2 mm thickness) can connect the plurality of sleeved column 309 to construct the staged support for the water storage tank 301. Further, the sleeved column 309 includes a plurality of a MS circular pipe 305 of predefined thickness (for example 50.8x2.03mm thickness), a plurality of HT (High Tension) core, and a plurality of intermediate MS plate 307 with a plurality of holes.

[00036] According to an embodiment, the sleeved columns 309 can be connected by the plurality of MS tube 308 to form a staircase structure overlapped with a zigzag positioned MS tubes 308 on each side of the staged support thereby to distribute a load evenly to the sleeved columns 309. For example, the sleeved columns 309 present in a corner interconnected together by the MS tube 308 of predefined size (for example 25.4x2mm thickness) at every 1000m and that forms a staircase like structure. Further, each MS tube 308 in the staircase connected by another MS tube 308 diagonally and the diagonal connection can be made in a zigzag manner to distribute load evenly throughout the sleeved column 309. A predefined size of the MS circular pipe 305, the HT stand core 306, and the intermediate MS plate 307 utilized based on a storage capacity of the water storage tank 301.

[00037] According to an embodiment, the HT stand core 306 with a predefined thickness may get placed inside the MS circular tube to form a staged support for constructing the water storage tank 301. The plurality of intermediate MS plate 307 with the plurality of holes can be placed inside the MS circular pipe 305 at places, where the MS tubes 308 joints are not present in the sleeved column 309. For example, the intermediate MS plates 307 are placed inside the MS circular tubes in between two staircase steps. According to the tank capacity the number of HT stand core 306 can be varied. Further, the number of holes in the intermediate MS plate 307 may also vary. For example, if the tank capacity is 20,000 liters then, the intermediate MS plate 307 can be of size 6mm thickness and placed at every 500m of the sleeved column 309. The plurality of the HT stand core 306 inserted through the plurality of holes provided in the intermediate MS plate 307.

[00038] Fig. 4 illustrates a cross section 303 of the single sleeved column, according to an embodiment of the present invention. The HT stand core 306 with a predefined thickness may be placed inside the MS circular tube to form a staged support for constructing the water storage tank 301. The HT stand core 306 can be surrounded by a heat treated and hardened EN 24 steel 304. The EN 24 steel 304 can be welded to the base of the MS plate 302 that is attached to the base of the water storage tank 301. The plurality of intermediate MS plate 307 with the plurality of holes can be placed inside the MS circular pipe 305 at places, where the MS tubes 308 are not connected to the sleeved column 309. The plurality of the HT stand core 306 inserted through the plurality of holes provided in the intermediate MS plate 307. The vertical section sliced at BB' 401 of the cross section of the single sleeved column 309 attached to the base of the water storage tank 301.

[00039] Fig. 5 illustrates a vertical sectional view 500 of the single sleeved column 209 at section BB' 401, according to an embodiment of the present invention. The vertical sectional view of the single sleeved column 309 provides the position of the HT stand core 306 and cement material that is filed tightly inside the MS circular tube. The MS circular pipe 305 can be grouted with cement material 501 to render enough compressive strength to the sleeved column 309 to resist damage. The sleeved column 309 can be welded to the base of the MS plate 302 that is attached to the water storage tank 301. The intermediate MS plate 307 can be provided inside the MS circular tube for better load distribution to the HT stand core 306.

[00040] Fig. 6 illustrates a plan view 600 of the sleeved column 309 staging support for constructing a water storage tank 301 at section AA' 310, according to an embodiment of the present invention. The plan view at AA' 310 of the sleeved column 309 staging support for constructing a water storage tank 301 displays the square type water storage tank 301. The sleeved columns 309 can be placed in corners of the staged support and can be welded to the base of the MS plate 302 of predefined thickness. The sleeved columns 309 can be connected by the MS tubes 308 of a predefined thickness. The shape of the storage tank can be a circular or rectangular staging structure. According to the requirement the dimension of the sleeved column 309, the MS tube 308, and the MS plate 302 may vary. [00041] According to an exemplary embodiment, an economical significance is analyzed for a water tank staging with conventional system and sleeved system. The comparison is depicted in a table.1 in terms of weight and cost for a sample water tank staging based on material requirement.

Table.1 Comparison between economic significance of Conventional System and sleeved column system

[00042] According to an exemplary embodiment, the cost for sleeved column is approximately 23 percent less than the conventional system.

[00043] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.