scholarly journals CALCULATION OF THE CONSTRUCTION OF THE SEWERAGE COLLECTOR DURING ITS REPAIR AND RESTORATION IN AN OPEN WAY

2021 ◽  
pp. 35-40
Author(s):  
Yevgenij Degtyar
Keyword(s):  
Reinforced Concrete ◽  
Polymer Concrete ◽  
Preliminary Calculation ◽  
Load Bearing Capacity ◽  
Small Depth ◽  
Support Element ◽  
Restoration Work ◽  
The Cost ◽  
To Receive ◽  
Monolithic Structure

A significant part of sewerage networks in cities in the country are reinforced concrete pipelines with a diameter of 500 to 1500 mm, which lie at a small depth. In many cases, they transport wastewater to treatment plants through areas free of traffic and pedestrians. These factors allow you to effectively perform repair and restoration work in an open way. Corrosion processes that occur in the surface part of the collectors lead to the destruction of the basement. The tray part of the collectors, which is constantly filled with wastewater, remains intact. As studies have shown, the preserved tray part can be successfully used as a fixed formwork and support element in the restoration of the basement of the collector. In this case, to create a new basement part of the collector, in place of the destroyed, it is advisable to use a monolithic structure of polymer concrete reinforced with composite reinforcement. These works are performed using pneumatic and inventory formwork. To implement the proposed structure, it is necessary to perform a preliminary calculation of its load-bearing capacity, provided that it rests on the preserved tray part. As a result of this work it is possible to receive economy in comparison with use for repair and restoration works of polyethylene and fiberglass pipes of necessary diameter. During the calculation, a model of the collector was considered, consisting of a preserved tray part of the collector made of concrete class C12 / 15, the upper part of the collector made of concrete class C20 / 25. The calculation proved the possibility of using polymer concrete structures for repair and restoration of sewers in an open way, provided that the new basement rests on the preserved tray part. The proposed open method allows to significantly reduce the cost of repair and restoration work in comparison with the use of polyethylene and fiberglass pipes.

scholarly journals APPLICATION OF PNEUMATIC FORMWORK FOR REPAIR AND RESTORATION OF SEWER PIPELINES USING CLINKER BRICK AND POLYMER CONCRETE

2021 ◽  
pp. 45-51
Author(s):  
D.F. GONCHARENKO ◽  
O.V. STARKOVA ◽  
R.I. GUDILIN ◽  
Yev.H. DEGTYAR
Keyword(s):  
Agricultural Land ◽  
Significant Part ◽  
Polymer Materials ◽  
Polymer Concrete ◽  
Main Bearing ◽  
Repair Work ◽  
Repair Costs ◽  
Network Diameter ◽  
Restoration Work ◽  
The Cost

Raising of problem. A significant part of wastewater in Ukrainian cities is discharged using sewer collectors with a diameter of 300 to 1 400 mm, the depth of which is within 3…8 m. A significant part of them is destroyed due to corrosion processes that take place in the surface space. Today, the problem of repair and restoration of sewerage networks is becoming especially relevant in connection with the increased requirements for environmental protection. Failure in sewer lines usually results in wastewater infiltration into groundwater and soil. During the repair and restoration of sewage collectors, open and closed methods of work are used. Taking into account that a significant part of sewage collectors passes through areas where there are no transport arteries, through agricultural land and have an insignificant depth of occurrence, and also the fact that their trough part, as a rule, cannot be destroyed due to corrosion, it is advisable to carry out repair and restoration work on them in an open way. Analysis of accidents on sewage collectors, which took place in different cities of Ukraine, showed that, as a rule, due to corrosion, intensive destruction of the roof of the collectors occurs. At the same time, the trough part of the collectors remains intact due to the fact that it is constantly filled with waste water. When repairing such sections of sewerage networks in recent years, operating organizations have been using polyethylene and fiberglass pipes. These smaller pipes are installed in the retained trough part, thus reducing the network diameter. The cost of new pipes is quite high, which in turn increases operating costs. The use of pneumatic formwork allows you to create a new collector, and as the main bearing element, you can use the saved tray part. Purpose. Evaluation of the possibility of using known materials for the manufacture of pneumatic formwork, which will make it possible to carry out repair work to create a new vault using the trough part of the sewer collector as a supporting structure, which will significantly reduce repair costs compared to using pipes made of polymer materials. Conclusion. The investigated samples of materials – fabric Mare 1400 and Hypolon (ORCA 828) – can be used for the manufacture of pneumatic formwork, since laboratory tests made it possible to conclude that there was no adhesion between concrete and material samples.

scholarly journals ACCOUNTING THE STEEL PROFILE IN THE CALCULATIONS OF THE LOADING CAPABILITY OF STEEL-CONCRETE BEAMS

2019 ◽  
pp. 26-33
Author(s):  
N. Vinogradova
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Structural Elements ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
External Reinforcement ◽  
Thin Walled ◽  
Monolithic Structure

Prefabricated monolithic floors are the best solution in terms of cost and time of work. In addition, due to the lightweight filling blocks included in the prefabricated monolithic structure, the overlap has less weight than the classic monolithic or precast slabs. Within the framework of this article, elements of prefabricated monolithic floors — reinforced concrete T-beams with a steel thin-walled profile, which is used primarily as formwork at the stage of construction and installation works, are calculated. Nevertheless, the calculation of the steel profile as an external reinforcement increases the load-bearing capacity of the beams by 50%. To assess the fact effect of the steel thin-walled profile on the strength characteristics of structural elements, experimental studies are conducted. According to the results of the experiment, it is found that the contribution of the steel thin-walled profile to the bearing capacity of the beams is 15%, while if the profile slip due to anchoring in the supporting zones is reduced, the bearing capacity increases by 50-60% compared to similar beams without a profile

scholarly journals Unification in the design of four-span continuous bridges

2021 ◽  
Vol 18 (3) ◽  
pp. 120-126
Author(s):  
A. V. Makarov ◽  
◽  
S. A. Kalinovsky ◽  
Keyword(s):  
Reinforced Concrete ◽  
Building Materials ◽  
Concrete Bridge ◽  
Construction Work ◽  
Load Bearing Capacity ◽  
Reinforced Concrete Bridge ◽  
Bridge Span ◽  
The Cost ◽  
Cost Of Construction ◽  
Continuous Metal

The article deals with the creation of continuous metal and monolithic reinforced concrete bridge span structures, which are the most efficient. Efficiency is achieved by searching for opportunities to unify structures with the most successful options for providing them with the required load-bearing capacity with the lowest cost of building materials. If a certain coefficient of the length of the extreme relative to the average is introduced, there can be achieved the equality of the transverse moments of spans. Such performance of the structure will allow building the bridge span as if combined from three types of unified blocks, which would reduce the labor complexity and the cost of construction work.

scholarly journals Acceptability of remote prescribing and postal delivery services for contraceptive pills and treatment of uncomplicated Chlamydia trachomatis

2020 ◽  
pp. bmjsrh-2020-200687
Author(s):  
Tom Nadarzynski ◽  
Ynez Symonds ◽  
Robert Carroll ◽  
Jo Gibbs ◽  
Sally Kidsley ◽  
...  
Keyword(s):  
Online Survey ◽  
Home Delivery ◽  
Transmitted Infection ◽  
Sexually Transmitted ◽  
Sti Testing ◽  
Contraceptive Pills ◽  
Remote Management ◽  
Delivery Services ◽  
The Cost ◽  
To Receive

ObjectivesThe digitalisation of sexual and reproductive health (SRH) services offers valuable opportunities to deliver contraceptive pills and chlamydia treatment by post. We aimed to examine the acceptability of remote prescribing and ‘medication-by-post’ in SRH.Study designAn online survey assessing attitudes towards remote management was distributed in three UK SRH clinics and via an integrated sexually transmitted infection (STI) postal self-sampling service. Logistic regressions were performed to identify potential correlates.ResultsThere were 1281 participants (74% female and 49% <25 years old). Some 8% of participants reported having received medication via post and 83% were willing to receive chlamydia treatment and contraceptive pills by post. Lower acceptability was observed among participants who were: >45 years old (OR 0.43 (95% CI 0.23–0.81)), screened for STIs less than once annually (OR 0.63 (0.42–0.93)), concerned about confidentiality (OR 0.21 (0.90–0.50)), concerned about absence during delivery (OR 0.09 (0.02–0.32)) or unwilling to provide blood pressure readings (OR 0.22 (0.04–0.97)). Higher acceptability was observed among participants who reported: previously receiving medication by post (OR 4.63 (1.44–14.8)), preference for home delivery over clinic collection (OR 24.1 (11.1–51.9)), preference for home STI testing (OR 10.3 (6.16–17.4)), ability to communicate with health advisors (OR 4.01 (1.03–15.6)) and willingness to: register their real name (OR 3.09 (1.43–10.6)), complete online health questionnaires (OR 3.09 (1.43–10.6)) and use generic contraceptive pills (OR 2.88 (1.21–6.83)).ConclusionsPostal treatment and entering information online to allow remote prescribing were acceptable methods for SRH services and should be considered alongside medication collection in pharmacies. These methods could be particularly useful for patients facing barriers in accessing SRH. The cost-effectiveness and implementation of these novel methods of service delivery should be further investigated.

Strengthening of reinforced concrete corbels with GFRP overlays

2011 ◽  
Vol 18 (1-2) ◽  
pp. 69-77 ◽  
Author(s):  
Sevket Ozden ◽  
Hilal Meydanli Atalay
Keyword(s):  
Reinforced Concrete ◽  
Reinforcement Ratio ◽  
Fiber Reinforced Polymer ◽  
Peak Performance ◽  
Test Results ◽  
Loading Test ◽  
Load Bearing Capacity ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Normal Strength

AbstractThe strength and post-peak performance of reinforced concrete corbels, strengthened with epoxy bonded glass fiber reinforced polymer (GFRP) overlays, were experimentally investigated. The test variables were the corbel shear span to depth ratio, corbel main reinforcement ratio, and the number and orientation of the GFRP fibers. In total, 24 normal strength concrete, one-third scale, corbel specimens, without hoop reinforcement, were tested to failure under quasi-static gravity loading. Test results revealed that GFRP overlays can easily be used for the enhancement of corbel load bearing capacity, depending on the fiber orientation. The main reinforcement ratio and the number of GFRP plies were found to be the two main variables affecting the level of strength gain in the corbel specimens.

scholarly journals Determination of the neutralization depth of concrete under the aggressive environment influence

2018 ◽  
Vol 33 ◽  
pp. 02010 ◽  
Author(s):  
Anastasia Morzhukhina ◽  
Stanislav Nikitin ◽  
Elena Akimova
Keyword(s):  
Reinforced Concrete ◽  
Chloride Ions ◽  
The Body ◽  
Chemical Plants ◽  
Reinforced Concrete Structure ◽  
Load Bearing Capacity ◽  
High Rise ◽  
Capacity Loss ◽  
Air Penetration

Aggressive environments have a significant impact on destruction of many reinforced concrete structures, such as high-rise constructions or chemical plants. For example, some high-rise constructions are equipped with a swimming pool, so they are exposed to chloride ions in the air. Penetration of aggressive chemical substances into the body of concrete contributes to acceleration of reinforced concrete structure corrosion that in turn leads to load bearing capacity loss and destruction of the building. The article considers and analyzes the main technologies for calculating penetration depth of various aggressive substances into the body of concrete. The calculation of corrosion depth was made for 50-year service life.

scholarly journals Comparison of Cement-Based and Polymer-Based Concrete Pipes for Analysis of Cost Assessment

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Orhan Bozkurt ◽  
Mehmet İslamoğlu
Keyword(s):  
Cost Effectiveness ◽  
Construction Industry ◽  
Cost Efficiency ◽  
Mechanical Efficiency ◽  
Polymer Concrete ◽  
Cost Assessment ◽  
New Techniques ◽  
Concrete Pipes ◽  
The Cost ◽  
Innovative Techniques

As the variety of materials utilized in construction industry has expanded, new techniques have been used in order to optimize the quality and efficiency of output. Therefore, recent innovations taking place in the construction industry led researchers to increase the mechanical efficiency of the output more than the cost effectiveness of it. However, especially professionals experiencing in the industry look into the cost effectiveness of the work. In other words, they also want researchers to justify the innovative techniques economically. The aim of this study is to provide a comparative analysis of the cost efficiency of polymer concrete used to manufacture durable and long-lasting reinforced concrete structures.

scholarly journals A THEORY OF AGENCY LAW

2011 ◽  
Vol 72 (3) ◽  
Author(s):  
Paula J Dalley
Keyword(s):  
Cost Benefit ◽  
Modern World ◽  
Unified Theory ◽  
Internalization Theory ◽  
Agency Relationship ◽  
The Third ◽  
The Law ◽  
The Cost ◽  
To Receive

Despite the ubiquity of agents in the modern world, agency law does not have a coherent explanation or unified theory. The Restatement (Third) of Agency updates and attempts to explain the law, but its explanations are limited in scope and at times unpersuasive. Like other contemporary commentary on agency law, the Third Restatement draws from contract and tort theory, an approach which ignores the unique features of agency law. Agency law enables principals to act through agents; it also ensures that principals using agents do not thereby escape liability or other consequences of their choices. This paper develops a theory to fit agency law. The "costbenefit internalization theory" is based on the simple premise that the principal, who has chosen to conduct her business through an agent, must bear the foreseeable consequences of that choice. Conversely, as the bearer of the risks, the principal is entitled to receive the benefits created by the agency relationship. The cost-benefit internalization theory explains and illuminates virtually all agency law doctrine.

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