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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Adaptive sawing : Yield of a concept in reality

Liljengren, Erik January 2009 (has links)
Glue board is the base for much solid wood furniture produced by the IKEA-owned company Swedwood. Glue board is glued together from lamellas which can be produced in different waysbut in all cases is produced from boards coming from a saw-mill. In a saw-mill there aredifferent techniques for producing boards from logs. This thesis is about the Adaptive sawingconcept and its implementation at the Swedwood site in Kostomuksha. The idea with the conceptis to raise the output from the raw material, the yield. This is partly achieved by edging away islittle as possible from the boards in the saw-mill. The boards in the saw-mill are sawn in a waynot unlike through-sawing. When brought to the glue-board factory they are scanned in order tooptimise how to rip out as much lamellas as possible. The ripped lamellas are then cross-cut intodifferent sizes which later are glued to glue board. The objective of this thesis is to examine theyield from log to glue board for the log classes 135-148 mm and 110-120 mm, to try to improveit and to identify problem factors. In order to achieve that it was necessary to be sure of the volume figures at all stages. Theincoming volume was given by the scanner at the log sorting; effort was therefore put down tomake sure the figures could be trusted. For the smaller log class the logs were instead measuredby hand and the volume was calculated. The logs were then sawn in the saw-mill. This was donewith a low production speed and some problems were noted compared with when sawing with astandard technique. The absence of edging was the main reason for these problems. The saw-millline was deemed inappropriate for sawing the smallest log class but could handle the 135 -148mm class and the yield for that class was in line with what could be expected. In the lamella production line some minor problems were noted and the boards from the fourdifferent batches from the 135 – 148 mm log class got different yields mainly due to differencesin wood quality. The yield from log to glue board for these four batches varied from 17.6 % to21.5 % with an average at 19.3 %. The yield was lower than what was achieved for earlieradaptive sawing test batches on other places. Those tests were however done on other diameterclasses and with material that was slightly different than the one in Kostomuksha. Simulationswere done to check how much the yield could be raised if other lamella widths than just thestandard 46 mm lamella width was used. A raise to an average of 20.9 % could then be expectedwhen using the lamella widths 46, 55 and 60 mm. A similar simulation was done for the adaptive material that was produced from the 110 – 120mm log class. The total yield for that material rose from 19.4 % to 22.4 % when using morelamella widths. Lamellas from this material were tested as there was fear, that they would notmeet the standards for glue board production. This did however not prove to be the case. To use the lamella production for producing such material is however not ideal, since a very smallvolume is produced. / Limfog är basen för de massivträmöbler som görs av IKEA:s helägda leverantör Swedwood.Limfog består av lameller som kan produceras på olika sätt. Oavsett produktionsteknik görs de av brädor som kommer från ett sågverk. På sågverket finns det också sågsätt för att såga utbrädor ur stockar. Det här examensarbetet behandlar konceptet adaptiv sågning och dessimplementering på Swedwoods anläggning i Kostomuksha. Den grundläggande idén med konceptet är att höja utbytet på råvaran. Detta uppnås bland annat genom att så lite som möjligtkantas bort på brädorna i sågverket. Brädorna sågas upp med vad man kan kalla genomsågning.När brädorna sedan förts till limfogsfabriken scannas de så att så mycket som möjligt ska kunnafås ut av varje bräda i form av lameller. Lamellerna som sågats ut kapas sedan upp i olikastorleksklasser beroende på kvalitet. Dessa limmas sedan ihop till limfog. Syftet med det härexamensarbetet är att ta fram utbytet från stock till färdig limfog för stockklasserna 135 – 148mm och 110 – 120 mm. Dessutom ska problemfaktorer identifieras och utbytet om möjligt höjas. För att uppnå detta syfte var det nödvändigt att ha säkra siffror för alla inblandade volymer isamtliga skeden. Stockarnas volym gav av en mätram vid timmersorteringen. Mycket kraft lasdärför ner för att säkerställa att dessa siffror var trovärdiga. Stockarna i den mindrediameterklassen mättes istället för hand och volym beräknades utifrån mätningarna. Stockarnasågades sedan på sågverket. Produktionshastigheten under sågningarna var låg och en delproblem i jämförelse med när sågning sker på mer traditionellt vis kunde noteras. Avsaknaden avkantning var huvudorsaken till dessa problem. Sågverkslinan visade sig vara olämplig för attsåga den mindre stockklassen, men kunde hantera stockar med en diameter på 135 – 148 mm.Utbytet för dessa var i linje med vad som kunde förväntas. I lamellproduktionslinjen kunde en del smärre produktionsproblem noteras och brädorna från defyra olika omgångarna av 135 – 148 mm stockar fick olika utbyte mest beroende på skillnader iråvarukvalitet. Utbytet från stock till limfog varierade från 17,6 % till 21,5 % och låg i snitt på19,3 %. Detta utbyte var lägra än vad som uppnåtts för adaptiv sågning på andra platser vidtidigare tester. De testerna utfördes dock på andra diameterklasser och det är därför svårt att raktav jämföra siffrorna. Dessutom kan råvaran ha varit något annorlunda. För att se hur mycketutbytet kunde höjas om andra lamellbredder användes förutom bara 46 mm, gjordessimuleringar. Totalutbytet kunde då höjas till i snitt 20,9 % i fall lamellbredderna 46, 55 och 60mm användes. En likadan simulering gjordes på materialet som producerades från diameterklassen 110 – 120mm. Totalutbytet för denna klass steg från 19,4 % till 22,4 % när fler lamellbredder användes.Eftersom det fanns viss oro att lamellerna skulle hålla lägre kvalitet övervakades de ilimfogsproduktionen. Oron visade sig obefogad. Att producera lameller från den diameterklassenär dock inte idealt eftersom den producerade volymen blir så liten.
92

Relaxačně sportovní objekt s ubytováním / Relax sports facility with accommodation

Richtárik, Radovan January 2019 (has links)
The Subject of this diploma thesis is design documentation of Relax sports facility with accommodation in Suchdol and Odrou. Mixed-use building is three-storeyed with partial basement. Roofing is flat single-skinned roof over the entire building. From the material point of view, the basement is made from lost formwork, all aboveground floors are bricked from ceramic blocks. The facade is designed as ventilated. Ceilings will be made from cast-in-place reinforced slabs and the sports ground will be covered with glued lamellar beams. The basement part of the building is relaxing - there are various types of saunas, cooler, whirlpool and massage room. On the first floor there is a restaurant with backgrounds and kitchen, a café, and sports activities in the form of badminton, squash and gym. Two more floors are used mainly to accommodate guests in the hotel. All operations are functionally connected by the reception hall.
93

Adheze lepených spojů fasádních obkladů z materiálů na bázi dřeva / Adhesion of Adhesive Joints for Facade Applications Made of Wood-based Materials

Nečasová, Barbora Unknown Date (has links)
The presented dissertation thesis is focused on investigating the adhesive properties of façade cladding made of wood and wood-based materials in combination with flexible adhesion/assembly systems. The systems allow the implementation of effective construction joints and provide a solution with uniform stress distribution which allows the transfer of heavy loads, while simultaneously reducing the weight of the entire structure, which is also often connected with substantial cost reductions. Despite all that, little attention has been paid to this area so far. It is not a solution which is properly embodied in technical standards or in designers´, architects´ and contractors´ awarenesses. The aim of this dissertation is to characterise adhesive properties of selected façade cladding representatives made of wood and wood-based materials for the purposes of bonded joint application in a ventilated façade system. To define adhesion of façade joints, numerical and experimental methods are used, taking also various limit conditions into account. The main conclusion of the dissertation is the characterisation of basic parameters which influence adhesion, effectiveness and quality of façade glued joints. The secondary conclusion is the compilation of a simple methodical procedure for testing and implementing façade glued joints. The dissertation also makes a contribution by extending the current state of knowledge of façade adhesive joints.
94

Sportovní centrum / Sports Centre

Hentschelová, Tereza January 2020 (has links)
The goal of this thesis is to elaborate project documentation of new sports centre. The building is situated on a plot No. 1930/48 of the cadastre territory in the town of Pacov. It is a building without cellar with two above-ground floors part on the area of 595,6 m2. The first floor part circuit structure consist of reinforced concrete walls with an outdoor climbing wall. The roofing is the mono-pitches roof with glue laminated timber beam and purlin with metal roofing. The building features an indoor climbing wall and a bar with seating. The second floor part is made of wooden CLT panels, the roof is designed as a green flat roof. This section provides facilities for athletes and staff and exercise halls. There are 50 parking spaces for cars in the building.
95

Katedrála v současnosti / Cathedral today

Král, David January 2020 (has links)
Theme of the thesis is a construction that is considered to be one of the most spectacular examples of a French gothic architecture. Notre-Dame Cathedral lies on the Eastern half of a Parisian island Île de la Cité on the river Seina. On April 15, 2019, roof of the cathedral caught on fire. It was completely destroyed, including its pinnacle. The thesis offers a solution how to restore the roof and what opportunities the new design brings. Aim of the proposal is enrichment of the Notre-Dame community through offering a new refuge, which will be for both, internal growth and spiritual practice itself. The design provides spaces that capture the path to God in them. I perceive the very path to God as a thorough inner work. That is why I am placing 36 contemplation booths in there, in addition to other 8 cabins. The light is removed from those, in order to extend the perception of consciousness. Spaces for individuals will be amended by 3 chapels for a group practice. Each chapel has its typical content - joint contemplation chapel, chapel that worships the Jesus Christ’s crown of thorns and a community chapel with a variable arrangement.
96

Sportovní hala / Sports hall

Horká, Petra January 2012 (has links)
The goal of this master´s thesis is to design load bearing structure of a sports hall. The thesis is elaborated in two variants of the structure design of the sports hall for common types of sports (handball, footsal, tennis, volleyball, basketball). The ground plan dimension is 42 to 72 meters and the construction height is 8 meters. The construction is designed for the district of Brno city. In the structural anlysis there were the following main load bearing structural elements designed and examined: glue laminated timber truss, wood purlins, steel beams, rods and bracing, columns, which together with the transverse girders are linked and foot and anchoring. The selected variant is also further developed. Part of the work is drawing documentation of the choosen variant, disposition drawing and drawings of the selected details.
97

Ocelová konstrukce obytné budovy / The Steel Structure of a Residential Building

Špeta, Václav January 2014 (has links)
The master's thesis deals with a project of the steel structure of a residential building. The building is thought like sevenfloor balcony-access house. The access balcony is situated in atrium in the middle of the building, which is roofed with a shell dome. The regular hexagon creates a ground plan of each floor. Every floor is turned 30 degrees compared to the next floors. The longest cross dimension is 43 m (axial). The height of the building is 30,4 m (including copula envelope). The final structure is chosen on the basis of optimization of the structural variants. The climatic load angle structure falls into the locality of the town Brno. The vertical supporting structure is made from steel-concrete accoupled circular section columns. The floor structure is designed from the steel rolled section I and H. These support assembly of a horizontal structure. Some joists and girder are designed like accoupled with a concrete floor slab. The copula above atrium is made from glue laminated timber ribs. Infill rods are from steel tube. The top ring of copula is designed from the rolled section UPE.
98

Ovlivnění zbytkových pevností slévárenských jader s biogenním pojivem / Influencing of residual strength of foundry cores bonded with biogenic binder

Šebesta, Pavel January 2015 (has links)
Foundry technology is an industrial sector, where progress is still the important aspect for reducing the environmental impact and increasing competitiveness. Master's thesis is focused on the possibilities of influencing residual strength of the core moulding mixtures with the biogenic binders, which forms a new group of binder systems.
99

Jezdecký areál ve Žďáře nad Sázavou / Riding Grounds in Žďár nad Sázavou

Jaitnerová, Vendula January 2016 (has links)
The diploma thesis deals with the project of the horse-riding grounds situated near the town of Žďár nad Sázavou. The complex of buildings consists of two riding halls, a groundskeeper’s flat, stables with a zone for riders and outside stable-boxes for horses. The buildings are laid out in a way to create a closed farmyard. There is a built-in unit located in the larger hall together with accommodation and restaurant with a great view to the riding hall. The horse-riding grounds are used for equitation In the first place. The two outside sandy riding arenas and the two indoor halls give an ideal opportunity for regular horse training as well as riders training. The halls would be also useful for holding the riding works all year round. It is possible to stable 19 horses in the indoor stable and 8 more in the outside stable-boxes in the farmyard. This diploma thesis deals with the project of horse-riding hall with a built-in unit, it also deals with a project for the groundskeeper’s flat and outside stable-boxes for horses. In the framework of the diploma thesis two specialties were elaborated – the project for heating in the built-in unit and the groundskeeper’s flat as well as the project for roofing the riding hall with the glue laminated timber girder. There are seminar paper and architectonic sketches included in the diploma thesis.
100

Rozhledna na jižní Moravě / The Viewing Tower in South Moravia

Turková, Martina January 2016 (has links)
This master’s thesis deals with the design and static assessment of a lookout tower in The Brno Zoological Garden situated on the hill called Mniší hora. The construction of the lookout tower is meant to be of a circular ground plan and its overall height is 31 m. The construction was designed in two variants. For both methods was used a combination of steel and solid or glued laminated timber. For detailed elaboration was selected only one variant. The lookout tower was assessed in a Scia Engineer 15.1 software.

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