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1
Odporne na korozję, wrażliwe na temperaturę [rury wodociągowe]
Mierzyński Szczęsny
Wodociągi - Kanalizacja
|
2021
|
nr 4
21--24
2
Content available remote Mechanical performance of overlap connections with grout-filled anchor reinforcements in embedded metal corrugated pipe
Chen Jun, Chen Xulin, Ding Fa-xing, Xiang Ping, Yang Cai-qian, Liu Yilong, Xu Fu
Archives of Civil and Mechanical Engineering
|
2020
|
Vol. 20, no. 4
456--467
EN
To study the mechanical performances of a new kind of overlapping connection with grouted anchor reinforcements in embedded metal corrugated pipes, a total of 24 groups of 72 specimens were prepared and tested. The overlap connection performance of grouting anchor reinforcements in embedded metal corrugated pipes was studied by bi-directional tension test. The factors such as the diameter of anchor reinforcements, anchor length and location of reinforcements were taken into account. The results show that the bi-directional tension test method can effectively reflect the actual stress state of the overlap connection. When the connection satisfies the structural requirements, the location of the reinforcement has little influence on the anchorage performance of the connection. Under the same conditions, the failure load of the specimens will increase with the increase of the diameter of reinforcements and the anchorage length. Meanwhile, under the same conditions, the average bond stress decreases with the increase of the reinforcement diameter and the anchorage length. Experimental results and analysis show that overlap connection with grout-filled anchor reinforcements in embedded metal corrugated pipe has good anchoring performances, and also has the advantages of simple structure and convenient construction.
3
Content available Reinforcement of composite pipelines for multipurpose transportation
Trykoz L., Kamchatnaya S., Pustovoitova O., Atynian A.
Transport Problems
|
2018
|
T. 13, z. 1
69--79
EN
The problem of monolithic behavior of a metal pipe and fiberglass safety cage has been considered in the article. The prestressed case does not only decrease the deformability of a pipe on-load but it also protects metal from corrosion. The ability to withstand the arising stresses has been investigated for both strip fiberglass reinforcement and the whole construction. It has been shown that the deformability of fiberglass depends on the kind of binder. The maximum strength value has been obtained while gluing glass fibers with butvar-phenolic glue. The calculated rupture strength coefficient of strip fiberglass reinforcement and the analysis of monolithic behaviour of metal and reinforcement proved the precondition as to the plasticity of a developed material. The process of force transmission between a steel pipe and fiberglass at ductile stage has been analyzed in the article. While forecasting the work of a pipe on-load, it is necessary to take into account nonlinearity of metal-fiberglass pipe properties.
4
Content available remote Problem doboru materiałów do budowy sieci wodociągowych. Cz. 1
Kwietniewski M.
Inżynier Budownictwa
|
2018
|
nr 7-8
57--62
PL
Obserwujemy w Polsce szybki rozwój i modernizację sieci wodociągowych. Pojawiła się szeroka oferta materiałów do ich budowy i problem wyboru najbardziej odpowiedniego materiału. Opracowano metodykę doboru materiałów zawierającą 30 kryteriów. Najważniejsze jest kryterium jakości, tj. minimalizacja negatywnego oddziaływania materiału na jakość przesyłanej wody. W artykule przedstawiono istotę metodyki wyboru wraz z charakterystyką materiałów pod kątem stopnia spełnienia kryterium jakości. Opisano także stan odnowy krajowych sieci wodociągowych jako najskuteczniejszej technologii poprawy jakości wody w sieciach.
EN
We observe the country's rapid development and modernization of water supply networks. A wide range of materials for their construction appeared. This situation created a problem of selecting the most suitable material. In order to meet the operators of water supply networks, a method for the selection of materials containing 30 criteria was developed. Among them the most important is the quality criterion, ie the minimization of the negative impact of the material on the quality of water transmitted through the pipes. The article presents the essence of the selection methodology along with the characteristics of materials in terms of the degree of meeting the quality criterion.
5
Content available remote Analysis of the nonstability states during bending processes of metallic tubes at bending machines. P. 1, Derivation of the basic expressions and relationships
Śloderbach Z.
Engineering Transactions
|
2016
|
Vol. 64, iss. 3
311--330
EN
In this paper the derivation of expressions for admissible values of strains and stresses for vertex points of layers subjected to tension during tube bending at bending machines is presented. The conditions of the dispersed and located loss of stability of the bent tube and the cracking criterion based on the technological index A5 (five fold sample) were assumed as criteria of instability. The original element of this paper is the extension of the criterion of strain location in a form of possible initiation of a neck or furrow (introduced by Marciniak for thin plates [1]) to bending thin- and thick-walled metal tubes at bending machines. Occurrence of loss of stability (especially that in a localised form) during tube bending can strongly reduce the service life. Thus, it is recommended to avoid such states during tube bending for elbows for pipelines or pipe installations.
6
Content available remote Determination of the initial thickness of tubes subjected to bending. Part II. Discussion and analysis of obtained results
Śloderbach Z.
Engineering Transactions
|
2015
|
Vol. 63, iss. 4
497--507
EN
In this second part of the paper, applying epressions derived in Part I, the exemplary calculations of the initial thickness of a metallic tube subject to bending at bending machines are presented. The expressions for calculating of the initial thickness were presented for a suitable measure of the big actual radius Ri in the bending zone for an exact (general) solution and for three formal simplifications of the 1st, 2nd, and 3rd order. In the calculations the external or internal diameter of the tube subjected to bending is applied as a parameter. In this paper, the author shows that the calculated initial thickness of the tube (for the same parameters of bending) depending on the external diameter is lower than that calculated depending on the internal diameter. For example, the expression for calculation of deformations included in the UE Directive [1], contains dependence on dext not on dint. The results of the calculations are presented in the graphs and tables enclosed.
7
Content available A derivation of the generalized model of strains during bending of metal tubes at bending machines
Śloderbach Z.
International Journal of Applied Mechanics and Engineering
|
2014
|
Vol. 19, no. 1
145--163
EN
According to the postulate concerning a local change of the “actual active radius” with a bending angle in the bend zone, a generalized model of strain during metal tube bending was derived. The tubes should be subjected to bending at tube bending machines by the method of wrapping at the rotating template and with the use of a lubricated steel mandrel. The model is represented by three components of strain in the analytic form, including displacement of the neutral axis. Generalization of the model during bending metal tubes at the tube bending machines as compared with the existing papers (Śloderbach, 1999; Śloderbach and Rechul, 2000) consists in including the neutral axis displacement and possibility of determination of strains at each point along the thickness of the wall of the bent tube in the bending and bend zone. The derived scheme of strain satisfies initial and boundary kinematic conditions of the bending process, conditions of continuity and inseparability of strains. The obtained analytic expressions can be classified as acceptable from the kinematic point of view.
8
Content available Numeryczna analiza odponości ogniowej uszczelnienia przejść rur metalowych przez przegrody
Laskowska Z.
Prace Instytutu Techniki Budowlanej
|
2010
|
R. 39, nr 3
3-16
PL
Omówiono model numeryczny dotyczący określania kryterium izolacyjności ogniowej uszczelnienia przejść rur metalowych przez przegrody wraz z algorytmem obliczeń. Przedstawiono wyniki analizy numerycznej.
EN
The paper describes the numerical model for determination of fire insulation criterion of metal pipe penetration seals. The computation algorithm and the results of numerical analysis are presented.
9
Content available Temperatura uszczelnień przejść rur metalowych przez ściany i stropy w badaniach odporności ogniowej
Laskowska Z.
Prace Instytutu Techniki Budowlanej
|
2008
|
R. 37, nr 3
19-32
PL
Omówiono metodę badania odporności ogniowej uszczelnień przejść rur metalowych przez ściany i stropy zgodnie z PN-EN 1366:2006. Przedstawiono wartości temperatury na rurach stalowych i miedzianych oraz na ich izolacji, uzyskane w badaniach odporności ogniowej. Podano wartości temperatury w zależności od średnic rur i grubości ich ścianek, długości i grubości izolacji rur, rodzaju izolacji oraz konfiguracji zakończenia rur podczas badania odporności ogniowej w zależności od ich zastosowania (C/C, C/U, U/C, U/U).
EN
The article describes fire resistance test method of metallic pipe penetration seals in accordance with PN-EN 1366-3:2006. The values of temperature on steel and copper pipes and on pipe insulation in fire resistance test are given. The values of temperature depending on: pipe diameters and thickness of wall pipes, length and thickness of pipe insulation, kind of insulation and pipe end configuration versus end-use.
10
Content available remote Spawanie rur z metali różnoimiennych
Walczak W.
Przegląd Spawalnictwa
|
2001
|
R. 73, nr 10-11
22-24
11
Problemy wymiarowe w obliczeniach procesu gięcia rur metalowych według dyrektyw i norm UE i Polski
Śloderbach Z., Kaźmierczak J.
Przegląd Mechaniczny
|
2001
|
nr 7-8
38-43
EN
There are derived analytical expressions up to the directions of EU and Poland for calculation of the deformation components and the wall thickness distribution in the processes of bending pipes and also expressions for calculation of final thicknes of a pipe to be bent until the maximum deformation in the bending zone is obtained. If the inner diameter of a pipe will be greater than in the case of the outer diameter being used for calculations, and reversely. This results from the fact that when the constant inner diameter of a pipe dw as measurement basis is used for calculation, the thickness of a wall grows to the outside thus increasing the initial diameter of a pipe, so the corresponding components of a deformation.
12
Laserowe doginanie rur : oprzyrządowanie i sterowanie
Janecki D., Mączyński J. F.
Przegląd Mechaniczny
|
1999
|
23-24
36-38
13
Composite tubes.
Leda H.
Inżynieria Materiałowa
|
1998
|
R. XIX, nr 4
745-749
EN
Frequently found tubes were analysed and compared with carbon fiber-epoxy tubes manufactured in a laboratory range. It was found that compression properties of tubes produced in our laboratory have properties comparable or even higher than those found in sports devices on the market. The composite material with carbon fibers treated in HNO3, in combination with epoxy resin with addition of Versamide has an adventage over another composite specimens. The positive influence of curing time was announced.
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