DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

AN APPARATUS AND METHOD FOR TRESTLE TESTING

GOA SHIPYARD LIMITED
An Indian Company having registered address at:
Vaddem House, Vasco-Da-Gama, Goa- 403802, India

THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

TECHNICAL FIELD
[001] The present subject matter relates generally to testing, and more specifically to an apparatus and method for testing a trestle.
BACKGROUND
[002] Trestle is a rigid frame used to support marine structures such as ships, ship blocks etc. during construction and transport. Trestles dimensions are designed to accommodate a range of marine structures which tend to be huge in size and designed for high load bearing capacity. A Jig Structure is used for testing of Trestle. Generally, preliminary testing of the Trestle is conducted through Finite Element Analysis (FEM) for measuring the deflection, section modulus, stresses at various points of the member, strength of the structure. However, a physical testing of the trestle is mandatory for ascertaining the trestle design requirements as various defect may creep into the trestles during manufacturing of the Trestles.
[003] As this ship/marine structure supporting trestles are non-conventional structures, a reliable testing equipment is required as available testing methods fail to test the trestles effectively and accurately before being utilized for marine construction, at least due to their huge size and weight.
SUMMARY
[004] Embodiments of the present disclosure present technological improvements as solutions to one or more of the above-mentioned technical problems.
[005] Before the present subject matter relating to an apparatus and method for testing a trestle, it is to be understood that this application is not limited to the particular system(s) and methodologies described, as there can be multiple possible embodiments which are not expressly illustrated in the present disclosure. It is also to be understood that the terminology used in the description is for the purpose of describing the implementations or versions or embodiments only and is not intended to limit the scope of the present subject matter.
[006] This summary is provided to introduce aspects related to an apparatus and method for testing a trestle. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the present subject matter.
[007] In an aspect of the present disclosure, an apparatus for testing a trestle is disclosed. The apparatus comprises a trestle, wherein the trestle comprises an elliptic tubular frame and a plurality of legs and a jig, wherein the jig comprises a jig bottom plate, a jig top structure disposed centrally on the jig bottom plate, and a plurality of bolted structure disposed at each end of the jig. In one example, during testing the trestle is mounted between the jig top structure and jig bottom plate, and a force is applied using a plurality of hydraulic disposed between jig top structure and the trestle, and a deflection is measured. In one more example, testing comprises a position 1 and position 2. Further, in position 1 plurality of legs are rested on the jig bottom plate. Furthermore, in position 2 the trestle is rested on a plurality of bolted structure such that there is a gap of 150 mm between the plurality of legs and the jig bottom plate.
[008] In an aspect of the present disclosure, a method for testing a trestle is disclosed. The method comprise the steps of mounting a trestle on a jig in position-1 and position-2, wherein the trestle comprises an elliptic tubular frame and a plurality of legs, wherein the jig comprises a jig bottom plate, a jig top structure disposed centrally on the jig bottom plate, and a plurality of bolted structure disposed at each end of the jig, wherein the in position 1 plurality of legs are rested on the jig bottom plate, and wherein in position 2 the trestle is rested on a plurality of bolted structure such that there is a gap of 150 mm between the plurality of legs and the jig bottom plate. Upon mounting the method comprises the steps of measuring first and second deflection for each position -1 and position-2 during application of a force by a plurality of hydraulic jacks on the trestle and after application of a force by a plurality of hydraulic jacks on the trestle. Further to measuring the method comprises the steps of computing if the trestle is within an elastic limit based on a difference between the first deflection and the section deflection for each position and comparison with a predefined threshold.
[009] Additional aspects, advantages, features and objects of the present disclosure would be made apparent from the drawings and the detailed description of the illustrative embodiments. It will be appreciated that features of the present disclosure are susceptible to being combined in various combinations without departing from the scope of the present disclosure as defined by the below mentioned detailed description and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The foregoing detailed description of embodiments is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure; however, the disclosure is not limited to the specific system/ apparatus or method disclosed in the document and the drawings.
[0011] The present disclosure is described in detail 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 same numbers are used throughout the drawings to refer various features of the present subject matter.
[0012] Figure 1 is sub parts of the Trestle, in accordance with an exemplary embodiment of the present disclosure.
[0013] Figure 2 sub parts of the Jig structure, respectively, in accordance with exemplary embodiments of the present disclosure.
[0014] Figure 3 the testing in position -1, in accordance with an exemplary embodiment of the present disclosure.
[0015] Figure 4 illustrates the testing in position -2, in accordance with an embodiment of the present subject matter.
[0016] Figure 5 illustrates the General Arrangement of testing procedure, in accordance with an embodiment of the present subject matter.
[0017] In the above accompanying drawings, a number relates to an item identified by a line linking the number to the item. When a number is accompanied by an associated arrow, the number is used to identify a general item at which the arrow is pointing.
[0018] Further, the figures depict various embodiments of the present subject matter for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the present subject matter described herein.
DETAILED DESCRIPTION
[0019] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising," "having," "containing," and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although an apparatus and method for testing a trestle, similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary Filter element having a central support tube is now described.
[0020] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. For example, although the present disclosure will be described in the context of an apparatus and method for testing a trestle, one of ordinary skill in the art will readily recognize an apparatus and method for testing a trestle can be utilized in any situation where there is need to test different type of trestles. Thus, the present disclosure is not intended to be limited to the embodiments illustrated but is to be accorded the widest scope consistent with the principles and features described herein.
[0021] In an aspect of the present disclosure, in order to overcome the above referenced problems and to provide various advantages elaborated in the later section, an apparatus and method for testing a trestle is disclosed.
[0022] In the said embodiment the JIG structure is designed and then a testing procedure is adopted for load testing of the Trestles. It is used primarily to give a basic assurance of trestle quality and in this sense has become part of a much broader quality control system. This will help the design / production departments to decide the spacing between the trestles for supporting marine/ship structures. So, a validated trestle structure has influenced virtually every aspect of ship/marine construction in recent years.
[0023] In an aspect of the present disclosure, an apparatus for testing a trestle is disclosed. The apparatus comprises a trestle, wherein the trestle comprises an elliptic tubular frame and a plurality of legs and a jig, wherein the jig comprises a jig bottom plate, a jig top structure disposed centrally on the jig bottom plate, and a plurality of bolted structure disposed at each end of the jig. In one example, during testing the trestle is mounted between the jig top structure and jig bottom plate, and a force is applied using a plurality of hydraulic disposed between jig top structure and the trestle, and a deflection is measured. In one more example, testing comprises a position 1 and position 2. Further, in position 1 plurality of legs are rested on the jig bottom plate. Furthermore, in position 2 the trestle is rested on a plurality of bolted structure such that there is a gap of 150 mm between the plurality of legs and the jig bottom plate.
[0024] Embodiments of the present disclosure substantially eliminate, or at least partially address, problems in the prior art. It should be noted that the above advantages and other advantages will be better evident in the subsequent description. Further, in the later section the present subject is better explained with reference to the figures.
[0025] Referring now to the drawings, Figures. 1-5 illustrate an apparatus and method for testing a trestle according to present invention. It should be noted that Figure 1-5 are merely an example. A person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure. In one example, Figure 1 illustrates is sub parts of the Trestle, Figure 2 illustrates sub parts of the Jig structure. Figure 3 the testing in position -1, Figure 4 illustrates the testing in position -2 and Figure 5 illustrates the General Arrangement of testing procedure, in accordance with an embodiment of the present subject matter. Before continuing with the description of the figures 1-9, Table 1 provided nomenclatures used in the figures.
Table1: Nomenclature
Number Name Number Name
001 Trestle 007 Support point during resting on ground
002 Jig 008 Support point during transportation
003 Bolted structure 009 Dial gauge indicator
004 Jig bottom plate 010 Leg Support
005 Jig Top structure to hold hydraulic jack and trestle 011 Top surface for resting ship
006 Hydraulic jack 012 Gap

[0026] In one embodiment a Jig Structure [002] and method for trestle [001] testing post manufacturing is disclosed. The testing is done to ascertain whether trestle [001] structure can take the designed load. Subsequently periodic checking of trestles is also required to check the feasibility of repeated use of trestles [001] using the same apparatus (Jig Structure) [002].
[0027] Typically, trestle [001] may be understood as a rigid frame in the form of a horizontal member supported at each end by a pair of legs [010], used to carry a range of marine/ship structures which tend to be huge in size and designed for high load bearing capacity.
[0028] In one example, Safe working load (SWL) for these trestles is 220 Tons. Trestle [001] structure is tested by applying load as per testing procedure which is 1.1 times SWL. Designed testing load for apparatus is 1.1x220= 242 tons. This implies that the apparatus is going to apply load of 242 Tons. Load is applied by the Hydraulic Jacks [006] mounted on the trestle [001] below the Jig structure [005] to hold the hydraulic jack.
[0029] In one more other embodiment, the apparatus is designed with factor of safety as 2. The load is applied after placing Trestle [001] on apparatus. Load is applied through hydraulic jacks [006] of capacity of 1.5 times SWL. For testing the trestles, hydraulic jacks (lifting devices) [006] are placed between trestle [001] and apparatus. The Jacks are placed between trestle [001] i.e., top of trestle [001] and bottom side of top Jig structure as shown in the figure 3, 4 & 5. The deflection is measured at various locations using dial gauge indicator [009], mostly at the areas under maximum stress as indicated by design calculation. The load is released and the trestle [001] deflections at same points are measured again. The difference between the two may be minimal which indicates that trestle [001] is within elastic limit.
[0030] As trestles are designed to rest in two distinct positions, one resting on hard stand (ship in stationary position 1) and second in resting at extreme position (ship in transportation mode position -2, refer fig 4). Load test is done for two different resting positions of trestles. In one example, the apparatus may be made from ABS Grade B steel material. Welding parameters are as per Welding Procedure Specification (WPS). In one more example, overall dimension of apparatus is 12.04 m x 2.31 m x 5.00 m as length, width, and height respectively.
[0031] Further, as shown in the figure 2, the apparatus [002] has three parts, Bottom structure, Structure to hold hydraulic jacks [006] & bolted structure [003]to test trestle [001] The trestles [001] are to be tested in two positions. Position 1 [figure 3] when trestle is in resting position on leg supports [010] and Position 2 [figure 4] when transportation mode resting at support points [008].
[0032] In one example a method for testing is disclosed. In the method comprise the steps of mounting a trestle on a jig in position-1 and position-2, wherein the trestle comprises an elliptic tubular frame and a plurality of legs, wherein the jig comprises a jig bottom plate, a jig top structure disposed centrally on the jig bottom plate, and a plurality of bolted structure disposed at each end of the jig, wherein the in position 1 plurality of legs are rested on the jig bottom plate, and wherein in position 2 the trestle is rested on a plurality of bolted structure such that there is a gap of 150 mm between the plurality of legs and the jig bottom plate.
[0033] Upon mounting the method comprises the steps of measuring first and second deflection for each position -1 and position-2 during application of a force by a plurality of hydraulic jacks on the trestle and after application of a force by a plurality of hydraulic jacks on the trestle.
[0034] Further to measuring the method comprises the steps of computing if the trestle is within an elastic limit based on a difference between the first deflection and the section deflection for each position and comparison with a predefined threshold.
[0035] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these following advantages may include those provided by some embodiments of the apparatus and method for trestle testing.
[0036] Some embodiments of the apparatus and method for trestle testing minimize time wastage and enable effective and accurate testing of trestle.
[0037] Although the description provides implementations of the filter element having a central support tube, it is to be understood that the above descriptions are not necessarily limited to the specific features or methods. Rather, the specific features and methods are disclosed as examples of implementations for the filter element having a central support tube.
,CLAIMS:I/We Claim:
1. An apparatus for testing, wherein the apparatus comprising:
a trestle, wherein the trestle comprises an elliptic tubular frame and a plurality of legs; and
a jig, wherein the jig comprises a jig bottom plate, a jig top structure disposed centrally on the jig bottom plate, and a plurality of bolted structure disposed at each end of the jig; and
wherein during testing the trestle is mounted between the jig top structure and jig bottom plate, and a force is applied using a plurality of hydraulic disposed between jig top structure and the trestle, and a deflection is measured.
2. The apparatus for testing as claimed in claim 1, wherein testing comprises a position 1 and position 2.

3. The apparatus for testing as claimed in claim 2, wherein in position 1 plurality of legs are rested on the jig bottom plate.

4. The apparatus for testing as claimed in claim 2, wherein in position 2 the trestle is rested on a plurality of bolted structure such that there is a gap of 150 mm between the plurality of legs and the jig bottom plate.

5. A method of testing, wherein method comprises:
mounting a trestle on a jig in position-1 and position-2, wherein the trestle comprises an elliptic tubular frame and a plurality of legs, wherein the jig comprises a jig bottom plate, a jig top structure disposed centrally on the jig bottom plate, and a plurality of bolted structure disposed at each end of the jig, wherein the in position 1 plurality of legs are rested on the jig bottom plate, and wherein in position 2 the trestle is rested on a plurality of bolted structure such that there is a gap of 150 mm between the plurality of legs and the jig bottom plate;
measuring first and second deflection for each position -1 and position-2 during application of a force by a plurality of hydraulic jacks on the trestle and after application of a force by a plurality of hydraulic jacks on the trestle; and
computing the trestle is within an elastic limit based on a difference between the first deflection and the section deflection for each position and a comparison with a predefined threshold.