Volume 02 Issue 07-2022
14
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
07
Pages:
14-19
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
A
BSTRACT
Thanks to the development of the production of high-strength synthetic fibres, the use of textile slings has
become available for both large factories and small enterprises. Currently, textile slings are becoming more
and more popular load-grabbing devices. The lightness, flexibility and high load capacity of this type of
sling allow you to solve many tasks in the field of lifting and moving cargo, which until recently were
considered impossible. In some cases, they are the only possible device for strapping and strapping cargo.
To a greater extent, this applies to goods that need careful handling. In numerous studies on the choice of
mounting cranes, the issues of parametric compliance of cranes with the characteristics of the mounted
elements are solved. In this work, the analysis of the relationship between the mass of the mounted
elements and the load capacity of synthetic slings is carried out. The article presents the positive qualities
of synthetic belt slings that are used in rigging work, describes the materials from which synthetic slings
are made, as well as deformation and mechanical characteristics.
K
EYWORDS
Assembly cranes, lifting devices, rigging, textile slings, rope properties, rope systems, rope extensions,
mounted elements.
Journal
Website:
http://sciencebring.co
m/index.php/ijasr
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Research Article
EXPERIMENTAL PRODUCTION CARGO-HANDLING DEVICES
FROM SYNTHETIC WOVEN TAPES
Submission Date:
July 15, 2022,
Accepted Date:
July 25, 2022,
Published Date:
July 30, 2022
Crossref doi:
https://doi.org/10.37547/ijasr-02-07-03
Bahodir Rakhmanov
PhD, Fergana Polytechnic Institute, 150107, Fergana, Uzbekistan
Volume 02 Issue 07-2022
15
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
07
Pages:
14-19
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
I
NTRODUCTION
In numerous studies on the choice of erection
cranes, the issues of parametric correspondence
of cranes to the characteristics of the mounted
elements are being solved. In this paper, an
analysis of the relationship between the mass of
mounted elements and the carrying capacity of
synthetic slings was carried out.
Thanks to the development of the production of
high-strength synthetic fibres, the use of textile
slings has become available for both large
factories and small enterprises. Nowadays, textile
slings are becoming more and more popular load-
handling devices. The lightness, flexibility and
high carrying capacity of this type of sling allow
solving many problems in the field of lifting and
moving goods, which until recently were
considered impossible [1, 2]. In some cases, they
are the only possible device for tying and slinging
cargo. To a greater extent, this applies to goods
that need careful handling [3].
Textile slings are slings made of textile webbing
in various designs and materials. Textile tape
slings are manufactured in accordance with the
requirements of RD 24-SZK-01-01 "General-
purpose cargo slings on a textile basis" [4, 5].
Slings are made from different polymers:
polyamide (kapron), and polypropylene, but
slings made of polyester fibres are more often
used, primarily from polyester (polyester), since
in addition to high abrasion resistance and
strength, it has a whole range of unique
properties. The standard carrying capacity of a
single-branch sling is 0.5 ... 25.0 t and a four-
branch sling is 1.25 ... 60 t. In some cases, such
slings are also made with a much larger carrying
capacity. For example, round-spun slings on a
textile basis up to 100 tons [6, 7].
M
ETHODS
In the example of the construction of the “Sports
Complex” facility in Fergana, experimental slings
of 4 geometric parameters were used, developed,
manufactured and tested by the applicant on a
foreign-made machine, STL-PP - 1000 - with a
carrying capacity of 1.0 tons; STL-PP - 2000 - with
a carrying capacity of 2.0 tons; STL-PP - 4000 -
load capacity - 4.0 tons. For installation using STL
data, structural metal elements and metal
structures of facades, ceilings and coverings of the
main hall measuring 54 x 60 m were taken as the
basis, mounted in November-December 2018 and
January-February 2019. The facility is serviced by
4 tower cranes KB - 4, with Q max. - 5 tons, two
truck cranes ZIL - "Ivanovets" with Q max - 16
tons. and one Chinese-made crane XCMG QV 30
K5–I–c Q max – 30 tons. - equipped with a
computer dynamometer. The total mass of
mounted metal structures is more than 300 tons.
[8, 9]
Depending on the value of the mass of the load
and the frequency by mass, the proposed
synthetic woven slings of four types and
parameters were used. Mounted elements were
Volume 02 Issue 07-2022
16
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
07
Pages:
14-19
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
painted or primed, and their capture by looped
slings did not damage the lined surfaces [10,11].
Table 1. Distribution by weight of metal elements of the coating and facade cladding (object "Sports
Complex" in Fergana)
Gro.
num.
X
Weight of
the
element,
tons
The
average
value of
the mass
in the Xi
group,
tons.
Mass
group
frequenc
y by mass
𝑛
𝑖
Particula
r Pi
=
𝑛
𝑖
860
Distribution
variance
𝜎
2
= (𝑥
𝑖
− 𝑥)
2
∙ 𝑃𝑖
Type and
parameters of
the
recommended
sling
1.
0-0,05
3
280
0,325
1,30
STL-PP - 500
2.
0,06-0,2
7
190
0,221
1,11
STL-PP - 500
3.
0,211-0,5
12
130
0,151
12,23
STL-PP - 1200
4.
0,51-0,7
25
98
0,114
55,18
STL-PP - 1200
5.
0,71-0,10
35
60
0,070
67,27
STL-PP - 1600
6.
0,10-1,5
48
44
0,051
89,96
STL-PP - 1600
7.
1,51-2,0
58
34
0,040
29,16
STL-PP - 2000
8.
2,1-2,5
75
24
0,030
7,68
STL-PP - 2000
295
860
1,000
264
R
ESULTS
Establishing the law of distribution of mounting
elements by mass, taking into account the existing
tendency to increase the mass of individual
elements, will make it possible to predict the
distribution of element types based on the initial
level. This technique will allow taking into
account the use of rigging equipment by lifting
and transporting equipment in the construction
of complex and especially complex buildings and
structures [12].
The distribution of elements by weight of metal
structures throughout the object is characterized
by the data given in Table 1.
With the maximum allowable error ∆=0.05 t. and
the degree of probability t=4, to obtain the
distribution law with a probability of 0.95 (t=2),
the sample size
N≥t^2∙σ^2/∆^2 ≥4∙264/0,16≥660 (1)
Since, 660<860, having a sample with the
accepted error value is sufficient.
Having provided this actual distribution in the
form of a histogram, we can assume that it is
approximated with sufficient accuracy by the
Volume 02 Issue 07-2022
17
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
07
Pages:
14-19
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
μ^2– distribution law is known in mathematical
statistics with a degree of freedom n=2. After
determining the law of distribution of mounting
elements by the mass of mounting elements and a
specific construction object in a specific period, it
is legitimate to formulate the problem of
predicting changes in this distribution in the
future [13, 14].
It is assumed that the revealed distribution law is
organically inherent in the process under study.
The problem is reduced to predicting the
parameters of the μ^2 distribution (the number
of degrees of freedom, the number of groups by
mass and their frequency).
The distribution curve under the influence of
structural changes "stretches" to the right.
Knowing the step of the groups by mass and their
frequency, determined based on the analysis of
the design documentation of the object, it was
established the change in the number of degrees
of freedom μ^2- distribution in such a way that
the function is approximated to the predicted
extreme values of the frequencies of the group by
mass (see Fig. 1.) [15-21].
Fig.1. Distribution curve of elements by mass of structures
This analysis makes it possible to pre-plan the
acquisition of equipment for the lifting
mechanism, that is, to take into account the use of
various synthetic slings for structures of various
weights.
C
ONCLUSION
Synthetic cables can be successfully used in
loading and unloading operations with the
required safety factor in the production of rigging,
while it is necessary to take into account the range
of weight characteristics of the goods being
transported. When wrapping a transported load
with a synthetic rope with a protective cover (in
the absence of mounting loops), it does not
scratch the surface, as happens when using a steel
cable. This property is relevant when moving
objects made of soft materials or with a finishing
layer.
Volume 02 Issue 07-2022
18
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
07
Pages:
14-19
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
The direction for further research on the
technology of rigging using textile-based slings
lies in the detailed development and research of
universal slings.
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