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Advantages of pipe bursting:
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Nov 24, 2004 (Image: Depiction of the principle of the pipe bursting process (dynamic bursting process in combination with short pipes) [FI-Tracta]) The basic idea behind pipe bursting, developed in the 80's of the 20th Century, is to pull a bursting body with a winch cable or a tension rod through the sewer that has been taken out of service and to thus destroy the pipe walling from the inside and to force it into the surrounding soil. A new sewer with the same … |
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Nov 24, 2004
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Jun 24, 2005 |
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With replacement in the same run of the pipe by the trenchless method, pipe eating and exchanging the old sewer occurs pipe, e.g. without excavating an open trench. With this method the most important processes are:
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The replacement of sewers, especially with the open cut method, is made much more difficult in inner urban areas by the existence of other supply pipes (Abschnitt 1.11) (Bild 1.11). They often present a substantial hurdle in carrying out construction work, which is reflected in the costs. … |
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(Image: Overview of replacement processes) Under replacement, there is understood, according to EN 752-5 [DINEN752-5:1997], the construction of a new drain or sewer, on or off the line of an existing drain or sewer, the function of the new drain or sewer incorporating that of the old. The replacement is always carried out at least in section lengths of the sewer using (Bild 5.4) :
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Under Drainage capability there is understood according to DIN 4045 [DIN4045:1985] the "possibility of discharging the flow of water or sewage with natural gradients or by means of artificial lifting (natural or artificial drainage capability)." Irrespective of whether the rehabilitation is a case of repair, renovation or replacement, the maintenance of the drainage capability (drainage security) during the construction phase requires special attention … |
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Nov 24, 2004 (Image: Decision process for the selection of structural solutions with reference to DIN EN 752-5 [DINEN752-5b]) As description of damage, its extent and its cause as well as the piping-specific limiting conditions in sewer systems are so different, the correct selection of the respective application case and the applicable structural rehabilitation measures are of great importance [Stein89c] [Stein95f]. All repair, renovation and replacement processes … |
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Nov 24, 2004 In view of the selection possibilities as well as the very involved piping-specific bordering conditions and other factors to be taken into account (such as structures, plant growth and traffic), the provision of decision aids that make it possible to choose the best possible structural rehabilitation process for application cases while taking process-technical, ecological, economic and legal considerations into account becomes increasingly important. |
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Nov 24, 2004 Engineering services are technical intellectual services that offer individual solutions for single-case tasks. They are not subject to the "Verdingungsordnung für Bauleistungen" German Contract Procedures for Building Works (VOB) [VOB92] nor the "Verdingungsordnung für Dienstleistungen" German Contract Procedure in the Service Industry (VOL) [VOL97]. These services are generally awarded by private contract letting according to the following selection … |
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An important feature of a proposal request based on a contract requirement with a specification sheet is that the technical planning phase of the measures to be adopted in sewage construction is generally already completed. The instructing party must describe the service so comprehensively on the basis of the planned construction proposal that all tenderers understand the description in the same way and can calculate their prices without comprehensive … |
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According to VOB/A ยง 9 Nos. 10-12, there is also the possibility of throwing open the proposal for the building works to competition. In this well-known proposal request process, also known as functional proposal request, the description of the service is also provided by the tenderer. The obligatory results contract of the instructing party describes the purpose of the completed service and should present a detailed description of the required construction … |
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What type of contract requirements in a proposal request is finally deemed to be "more suitable" for the particular case depends on a multitude of factors. The more the planning is moved into the proposal request, the more the proposal request should move in the direction of the obligatory results programme. If one views the present proposal request practice in the execution of sewer rehabilitation, then one finds that §, in comparison with new sewer … |
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Nov 24, 2004 The ATV-M 143 Part 5 [ATVM143-5a] has the aim that all tenderers understand the contract requirements when applied to the relining process according to ATV-M 143E Part 3 [ATVM143-3] unambiguously, that they can calculate their prices with safety and that they can avoid differences in competitiveness. This specification pamphlet can also be used as a base for other rehabilitation processes for repair of damage until other process-specific specifications … |
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Nov 24, 2004 The guidelines of the AGI [AGI94a] contain keyword listed individual services divided into the following sections:
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Nov 24, 2004 The "Gemeinsame Ausschuss Electronik im Bauwesen" (Combined Committee for Electronics in Construction) (GAEB) has taken on the task of promoting rationalisation in the construction field by means of data processing. They deal with the federal and the state sectors, the main communal associations as well as the main organisations of industry and technology that are concerned with construction work. The GAEB is involved wherever matters of construction … |
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Feb 16, 2011 Standard specification book - LB 309: "Reinigung und Inspektion von Abwasserkanälen und -leitungen" (Cleaning and inspection of drains and sewers) |
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Feb 16, 2011 (Image: Example of a specification position from the standard specification book LB 310 (Standard service number STL-No. 310/080 2102) [LB310]) This specification section of the StLB [LB309] also limits itself to non-man-accessible drains and sewers. It comprises exclusively the process groups "Repair" and "Renovation". The structure of the LB 310 is based on the idea that before its application, the selection of the process has already been carried … |
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In order that specification sheets for the rehabilitation of sewers can be laid down in a professional and safe manner and that they contain all the information to enable the tenderer to work out a price and to execute the work, aids to proposal requests have been developed by various institutions in the past years, such as:
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Nov 24, 2004 In the Federal Republic of Germany, the federal, the states and community administrators as well as a large number of non-public developers make use of the "Verdingungsordnung für Bauleistungen" (VOB) (Contract Procedures for Building Works) in the purchase of building works [VOB92]. The VOB provides rules for the procedure for the contract letting of public building contracts and formulates general contract conditions, which place the rights and … |
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Jul 26, 2005 Starting point of each qualified network analysis is an extensive analysis of the actual condition of the network or network part looked at. Here, it has to be considered that the significance of following predictions decisively depends on the completeness and consistency of the data taken as a basis as well as their analysis within the scope of the evaluation of the actual condition. For this reason, previous to the start of the evaluation of the … |
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Jul 26, 2005 The aging process of drain and sewer systems depends on a variety of influencing factors and interdependencies similar to the lifetime of humans and cannot be grasped mathematically for a specific individual case. For the aging prediction the observed network aging of the past is mathematically represented instead and extrapolated into the future. For that purpose the cohort survival model, which was developed in demography, is applied [Truji95]. … |
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