Development of multi-layered sewer pipe plug — 2nd report: Tensile strength of protective sheet bonded by seams

2021 ◽  
pp. 2140016
Author(s):  
Nao-Aki Noda ◽  
Geng Gao ◽  
Hisanori Tottori ◽  
Rei Takaki ◽  
Yoshikazu Sano ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Specimen Geometry ◽  
Construction Site ◽  
Sewer Pipe ◽  
Sewer System ◽  
Testing Method ◽  
Strength Formula

Since Japanese sewer system is becoming obsolete, it is necessary to reinforce and repair the system without stopping sewer functions. In this study, a multi-layered sewer pipe plug consisting of a protective sheet and inner and outer rubber balls is focused to be installed and removed conveniently at the construction site. In this paper, a suitable testing method and the strength of the protective sheet are discussed experimentally by changing the specimen geometry providing slit and seams. It is found that the slit specimen is most desirable to obtain the standard tensile strength of UHMWPE cloth named Izanas cloth. It is found that the seamed strength is [Formula: see text] MPa, which is about 17% of the standard tensile strength [Formula: see text] MPa.

Development of multi-layered sewer pipe plug — 3rd report: Tensile strength of protective sheet bonded by adhesive

2021 ◽  
pp. 2140017
Author(s):  
Nao-Aki Noda ◽  
Hisanori Tottori ◽  
Geng Gao ◽  
Rei Takaki ◽  
Yoshikazu Sano ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Adhesive Strength ◽  
Adhesive Joint ◽  
Construction Site ◽  
Sewer Pipe ◽  
Adhesively Bonded ◽  
Sewer System ◽  
Strength Formula ◽  
Short Time ◽  
Adhesively Bonded Structures

Since the sewer system in Japan is becoming obsolete, it is, therefore necessary to reinforce or repair without stopping sewer functions by applying a suitable water stopping method. In this study, a multi-layered sewer pipe plug consisting of a protective sheet and inner and outer rubber balls is focused since it can be installed and removed at the construction site in a short time conveniently. Four types of adhesively bonded structures are investigated experimentally by changing bonding processes and adhesives. It is found that the main and base adhesive joint is the most suitable since the pressurized adhesive strength [Formula: see text] MPa is 30% of the standard tensile strength of the protective sheet [Formula: see text] MPa.

Development of multi-layered sewer pipe plug — 1st report: Ruptured test and stress analysis of protective sheet

2021 ◽  
pp. 2140015
Author(s):  
Nao-Aki Noda ◽  
Hisanori Tottori ◽  
Geng Gao ◽  
Rei Takaki ◽  
Yoshikazu Sano ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Maximum Stress ◽  
Construction Site ◽  
Sewer Pipe ◽  
Sewer System ◽  
Inner Diameter ◽  
Short Time ◽  
Conventional Type

In recent years, the sewer system in Japan is becoming obsolete. It is, therefore, necessary to reinforce or repair without stopping sewer functions by applying a suitable water stopping method. In this study, a multi-layered sewer pipe plug consisting of a protective sheet and inner and outer rubber balls is focused since it can be installed and removed at the construction site in a short time conveniently. This sewer pipe plug has several advantages dealing with various diameters compared to the conventional type. In this study, the rupture test is conducted to improve the water stopping performance. The fractured position of the protective sheet of the sewer pipe plug is investigated experimentally. It is clarified that the maximum stress around the flange portion can be reduced by decreasing the flange inner diameter.

scholarly journals A sewer overflow mitigation during festival and rainfall periods: case study of Karbala

2020 ◽  
Vol 10 (12) ◽  
Author(s):  
Hussein Abed Obaid Alisawi
Keyword(s):  
Water Management ◽  
Water Depth ◽  
Storm Water ◽  
Management Model ◽  
Sewer Pipe ◽  
Sewer System ◽  
Storm Water Management ◽  
Storm Water Management Model ◽  
Sewer Overflow

AbstractThe objective of the present study to assess the performance of a suggested sewer line by using pipe jacking system (PJS) in order to enhance the sewage capacity and mitigate sewer flooding of historic pilgrimage city of Karbala, Iraq. The storm water management model (SWMM5) was used for this purpose. The simulation of exiting sewer system reveals that sewer discharge during peak pilgrimage period is more than 200% of the capacity of existing sewer line. Installation of SLL having a diameter of 2.5 m at a depth ranging between 12 and 22 m by PJS can reduce water depth in sewer pipe by 78%. The reduction of water depth at sewer pipe can reduce sewer overflow up to 70%, if the system is installed and managed properly. The methodology proposed in the paper can be applied in any location having similar problem with necessary modifications.

Micro-Strength Analysis of Sand Mold for Casting Based on Bonded-Particle Model

2016 ◽  
Vol 723 ◽  
pp. 316-321
Author(s):  
Fu Xian Zhu ◽  
Zhong De Shan ◽  
Fen Liu
Keyword(s):  
Tensile Strength ◽  
Mass Fraction ◽  
Experimental Results ◽  
Sand Mold ◽  
Strength Analysis ◽  
Particle Model ◽  
Beam Model ◽  
Bonded Particle Model ◽  
Strength Formula ◽  
The Relationship

The micro-strength of sand mold is analyzed based on bonded-particle model (BPM) due to the reason that the strength of sand mold largely influences the final casting properties. In this study, the stress and the strength as well as the stiffness parameters of the binding bridge between the sands are obtained firstly by establishing the equivalent micro-beam model of the binding bridge between the sands. Then, the tensile strength formula of Sand Mold is derived according to the idea packing shape of particle, which is then used for discussing the relationship between the tensile strength with the sand mesh and the mass fraction of binder. At last, the effects of the sand mesh and mass fraction of binder on the tensile strength of the Sand Mold are analyzed quantitatively, which shows the great agreement with the macroscopic experimental results of the sand mold strength.

Evaluation of Tensile Behaviour of GFRP/SiC Polymer Reinforced Composites

2015 ◽  
Vol 766-767 ◽  
pp. 70-72 ◽  
Author(s):  
S. Rajesh ◽  
B. Vijaya Ramnath ◽  
C. Elanchezhian ◽  
C. Kavin ◽  
S. Sathish
Keyword(s):  
Silicon Carbide ◽  
Tensile Strength ◽  
Composite Material ◽  
Polymer Composite ◽  
Matrix Composite ◽  
Tensile Behaviour ◽  
Reinforced Composites ◽  
Testing Method ◽  
Reinforced Polymer ◽  
Gfrp Composite

Silicon Carbide/GFRP reinforced matrix composite and SiC matrix composite has been developed by using hand layup and resin casting methods respectively. The GFRP reinforced polymer composite is made by sandwiching two layers of GFRP in between the SiC material. The resin used for the preparation the samples are epoxy and polyester, for both SiC/GFRP composite and SiC composite. An Arcan fixture with butterfly specimen is used to measure the fracture occurring in various modes of the polymer composite. The objective of the proposed testing method is to determine the variation in the stress value depending on the resin material as well as the influence of GFRP in the strength of SiC polymer composite. Results from the tests are analyzed to show that the epoxy resin is better for tensile strength, in both Sic/GFRP reinforced and SiC composite material.

scholarly journals Experimental Study on the Compressive Strength of Big Mobility Concrete with Nondestructive Testing Method

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Huai-Shuai Shang ◽  
Ting-Hua Yi ◽  
Lu-Sheng Yang
Keyword(s):  
Experimental Study ◽  
Nondestructive Testing ◽  
Regression Method ◽  
Construction Site ◽  
Rebound Hammer ◽  
Existing Structures ◽  
Testing Method ◽  
Rebound Number ◽  
Nondestructive Testing Method ◽  
Set Up

An experimental study of C20, C25, C30, C40, and C50 big mobility concrete cubes that came from laboratory and construction site was completed. Nondestructive testing (NDT) was carried out using impact rebound hammer (IRH) techniques to establish a correlation between the compressive strengths and the rebound number. The local curve for measuring strength of the regression method is set up and its superiority is proved. The rebound method presented is simple, quick, and reliable and covers wide ranges of concrete strengths. The rebound method can be easily applied to concrete specimens as well as existing concrete structures. The final results were compared with previous ones from the literature and also with actual results obtained from samples extracted from existing structures.

Testing Research of Aspect Ratio on Corrugated Box Compression Strength

2011 ◽  
Vol 48-49 ◽  
pp. 1213-1216 ◽  
Author(s):  
Zhuan Wei ◽  
Guang Jun Hua ◽  
De Jian Zhao
Keyword(s):  
Aspect Ratio ◽  
Compression Strength ◽  
Simulation Method ◽  
Strength Increase ◽  
Classical Formula ◽  
Forming Process ◽  
Testing Method ◽  
Corrugated Cardboard ◽  
Strength Formula ◽  
Formula Method

The aspect ratio is one of the important factors that impact the corrugated box compression strength. In this paper, the three most commonly method that can be used to obtain the corrugated boxes’ compression strength, namely testing method, classic formula method and computer simulation method were compared. Selecting some 0201 BC flute corrugated boxes as the object, on the condition that the cardboard materials, carton height and circumference of the corrugated box is at the same, the compression strength of corrugated boxes which aspect range from 1 to 3 were tested and calculated respectively by compression strength testing method and classical formula. The results show that when the aspect ratio changes from 1 to 3, the compression strength increase at first, and then decrease; the compression strength reach maximum when the aspect ratio at 1.6 or so. The results show that the classic formula calculation data are large deviate from the testing ones. Research shows that due to not fully take into account the influence of corrugated cardboard quality, box forming process, temperature and humidity and other factors, the currently classic compression strength formula are more conservative.

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