Universidade da Região da Campanha – URCAMP Centro de Ciências Exatas e Ambientais Curso de Arquitetura e Urbanismo Estágio Curricular Supervisionado Lia Quintana e Virginia Dreux
RELATÓRIO DE ESTÁGIO SUPERVISIONADO
Acadêmica: Jéssica Guarienti Guarienti Bagé, Dezembro de 2014
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Universidade da Região da Campanha – URCAMP Centro de Ciências Exatas e Ambientais Curso de Arquitetura e Urbanismo Estágio Curricular Supervisionado Lia Quintana e Virginia Dreux
RELATÓRIO DE ESTÁGIO SUPERVISIONADO
Trabalho realizado na disciplina de Estágio Curricular Supervisionado do curso de Arquitetura e Urbanismo para aprovação da Disciplina.
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SUMÁRIO 1- Introdução......................................................................................................06 1.1- Dados da Obra.................................................................................06 1.2- Objetivo............................................................................................06 1.3- Justificativa ......................................................................................07 1.4- Metodologia......................................................................................07 2- Revisão Bibliográfica.....................................................................................07 2.1 – Alvenaria Convencional..................................................................07 2.2 - Viga de Amarração e Pré-laje.........................................................12 2.3 - Revestimento..................................................................................18 2.3.1 – Chapisco.....................................................................................18 2.3.2 – Reboco........................................................................................20 3- Atividades Desenvolvidas..............................................................................24 3.1- Alvenaria..........................................................................................24 3.2- Viga de Amarração e Laje................................................................29 3.3- Revestimento...................................................................................38 4 - Conclusão.....................................................................................................46 5 - Referências Bibliográficas............................................................................47 6- Anexos...........................................................................................................49
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LISTA DE FIGURAS
Figura 1 – Escantilhão no canto e linha colocada com pregos........................08 Figura 2 – Verificação do nível e do prumo da alvenaria.................................09 Figura 3 – Métodos de assentamento da alvenaria com argamassa............... 09 Figura 4 – Sobrecarga sobre a contraverga ....................................................10 Figura 5 –Encunhamento de tijolos inclinados e cortados na diagonal............11 Figura 6 –Encunhamento com expansor..........................................................11 Figura 7 –Caixaria para concretagem da cinta.................................................13 Figura 8 – Escoras e pontaletes.......................................................................13 Figura 9 – Detalhe dos tipos de vigotas e tavelas............................................14 Figura 10 – Escoramento para montagem.......................................................15 Figura 11 – Montagem da pré- laje...................................................................16 Figura 12 – Detalhe de apoio das tábuas.........................................................16 Figura 13 – Tavelas com caixas de luz e armaduras.......................................17 Figura 14 – Arremesso do chapisco.................................................................20 Figura 15 – Chapisco executado......................................................................20 Figura 16 – Mestras ou taliscas que ajudam na espessura do reboco............21 Figura 17 – Aplicação e sarrafeamento do reboco...........................................22 Figura 18 – Esperando o reboco descansar descansar para sarrafear............. sarrafear.............................22 ................22 Figura 19 – Desempenando o reboco com a desempenadeira........................ 23 Figura 20- Viga baldrame impermeabilizada e fiada de destacamento............24 Figura 21- Assentamento iniciado pelos cantos...............................................25 Figura 22- Linha que serve de guia para o assentamento dos tijolos no alinhamento..................................................................................................25 Figura 23- Mangueira utilizada para conferir o nível.........................................26 Figura 24- Verificação do prumo a cada fiada..................................................26 Figura 25- Assentamento do tijolo, aplicando a argamassa.............................27 Figura 26- Andaimes para seguir o levantamento da parede...........................28 Figura 27- Marcação de vãos de janelas no nível do peitoril........................ ....28 Figura 28- Vãos de janelas escorados..............................................................29 Figura 29- Cinta de amarração acima da última fiada.......................................30 Figura 30- Amarração das ferragens.................................................................30 Figura 31- Formas externas...............................................................................31 Figura 32- Formas internas, e escoramento......................................................31 Figura 33- Tábuas transversais à vigota e escoras...........................................32 Figura 34- Encaixe de vigota pré-moldada com tavela cerâmica......................33 Figura 35- Encaixe de vigota treliçada com tavela cerâmica............................. 33 Figura 36- Colocação das armaduras e componentes componentes elétricos........................34 elétricos................... .....34 Figura 37- Colocação das armaduras e componentes componentes elétricos........................35 elétricos....................... .35 Figura 38- Concreto realizado no canteiro de obras..........................................36
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Figura 39- Concreto levado por baldes até a laje..............................................36 Figura 40- Concreto distribuído por carrinhos de mão.................................. .....37 Figura 41- Concreto sendo espalhado com a régua e as caixas de luz tapadas com lona............................................................................................................37 Figura 42- Concreto empurrado com a colher de pedreiro........................ ........38 Figura 43- Inicio do chapisco, enquanto esperavam esperavam material da pré-laje.........39 pré -laje.........39 Figura 44- Aplicação do chapisco......................................................................39 Figura 45- Aplicação do chapisco......................................................................40 Figura 46- Talisca sendo alinhada com a linha.................................................41 Figura 47- Reboco iniciando pelo lado externo.................................................42 Figura 48- Reboco arremessado contra a parede.............................................43 Figura 49- Retirando o excesso do reboco com a régua........................ ...........43 Figura 50- Régua presa no canto para acabamento do reboco........................44 Figura 51- Acabamento com a desempenadeira...............................................44 Figura 52- Colocação do contramarco...............................................................45
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1- Introdução O presente trabalho da disciplina de Estágio Supervisionado foi desenvolvido em uma residência unifamiliar na cidade de Bagé/RS. Este relatório irá descrever as atividades realizadas durante o acompanhamento da execução por meio de visitação, além da pesquisa realizada sobre cada uma das fases escolhidas. Durante as visitas à obra foram f oram analisadas 3 fases diferentes, onde foram executadas consecutivamente no período de acompanhamento. Assim, alvenaria convencional, concretagem (cinta de amarração e laje) e revestimento (chapisco e reboco) foram as etapas observadas tanto em relação aos materiais como em técnicas construtivas utilizadas. Sendo assim, este trabalho relata como a execução de cada etapa deve ser feita segundo as referências bibliográficas pesquisadas e contrapõe com o que realmente é realizado na obra.
1.1-Dados da obra Tipo de obra: Residência Unifamiliar Térrea Endereço: Rodovia General Artigas, 4928. Área: 90,28m² Responsável técnico(a): Luciani Corrêa
1.2-Objetivo A disciplina de Estágio Supervisionado propõe ao acadêmico a observação e o acompanhamento de etapas de obras, colocando em prática toda teoria adquirida ao decorrer do curso sobre materiais e execução. Assim proporcionando ao estagiário o treinamento prático, aperfeiçoamento técnico e de relacionamento humano, como complementação da sua formação profissional no ambiente de trabalho.
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1.3-Justificativa O estágio é um momento de fundamental importância no processo de formação profissional, pois para melhor entender a teoria que aprendemos nas aulas, a disciplina tem a finalidade de unir a teoria à prática, assim exercita sua adaptação ao meio profissional. Desempenha de forma eficiente a união entre os mundos acadêmico e profissional ao possibilitar a oportunidade de conhecimento e exercit ar à prática.
1.4- Metodologia No andamento do estágio, além de ir na obra durante a execução das etapas escolhidas observando os procedimentos e realizando o levantamento fotográfico, também foi imprescindível as pesquisas feitas sobre as fases, os assessoramentos com as orientadoras, e o questionamento feito aos profissionais que trabalham na obra, assim obtendo amplo conhecimento sobre as etapas acompanhadas na obra. Portanto o trabalho baseia-se no comparativo entre as observações feitas na visita e as referências bibliográficas pesquisadas, assim analisando se os métodos usados são os mesmos citados na teoria.
2 - Revisão Bibliográfica 2.1 - Alvenaria Convencional Convencional
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De acordo com Milito (2009), ‘’ A alvenaria pode ter função estrutural ou quando não é dimensionada para resistir cargas verticais além de seu próprio peso é denominada alvenaria de vedação.’’
Após a impermeabilização impermeabilização da viga baldrame, baldrame, é necessário esperar um dia para começar a erguer as paredes, assim inicia-se i nicia-se posicionando os escantilhões nos cantos e estendendo a linha de um escantilhão a outro para obter o alinhamento dos tijolos da fiada, fiada, como mostra a figura 1. A superfície superfície que receberá a fiada de marcação deve estar limpa e úmida, logo após é feito o destacamento das paredes marcando a primeira e segunda fiada. Concluída a marcação, começa-se o assentamento pelos cantos onde servirão de guias para seguir levantando o resto da parede marcando a linha a cada fiada e verificando o prumo e o nível (Figura 2) a cada 3 fiadas com nível bolha e fio de prumo, respectivamente. (MILITO, 2009; BARROS, S.D.)
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Figura 2 – Verificação do nível e do prumo da alvenaria. Fonte: https://edificaacoes.files.wordpress.com/2009/12/5-mat-alvenaria.pdf
É utilizado uma argamassa de assentamento de cimento, cal e areia no traço 1: 2: 8. Na qual existem dois métodos, onde o 1º a argamassa é colocada em abundância em cada fiada e o excesso é rebatido com a colher, já no 2º método a argamassa é aplicada no tijolo a ser assentado com a colher, como mostra a figura 3. (MILITO, 2009; BARROS, S.D.)
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Alguns cuidados devem ser tomados na hora da execução da alvenaria, assim como molhar o tijolo antes de assentar para facilitar a aderência e eliminar o pó que envolve o tijolo, assim como impedir a absorção da água da argamassa. Além disso os tijolos devem ser assentados de modo que sempre haja o desencontro de juntas para que a amarração seja da melhor forma possível, e sempre que houver saliências maiores que 4cm preencher com quebras de tijolo, vetando o uso da argamassa. (MILITO, 2009; BARROS, S.D.) A colocação de tacos de madeira para fixação de batentes de porta e janelas se faz juntamente com a alvenaria para evitar a quebra de tijolos já assentados para embutir os tacos. Além disso, nos vãos de portas e janelas, deverá ser executada a verga onde é o elemento estrutural sobre o vão a fim de evitar sobrecarga das esquadrias, como exemplificado na figura 4. Deve passar 30cm ou 1/5 do vão de ambos os lados e no caso das janelas além da verga deverá ter a contraverga no peitoril. (MILITO, 2009; BARROS, S.D.)
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diferentes nas duas seções ou partes do painel, como mostra a figura 5. No entanto, esse procedimento vem sendo substituído por novos materiais e técnicas que oferecem melhor rendimento. Como apontado na figura 6, a utilização de cimento expansor, onde é uma argamassa pronta a base de cimento, cujo adicionamento de água permite sua expansão. (MILITO, 2009; BARROS, S.D.)
Figura 5 –Encunhamento de tijolos inclinados e cortados na diagonal. Fonte: https://edificaacoes.files.wordpress.com/2009/12/5-mat-alvenaria.pdf
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2.2- Cinta de Amarração e Pré-Laje A cinta de amarração é feita após a última fileira da alvenaria levantada. De acordo com Barros (S.D) Quando as lajes de concreto armado estão apoiadas diretamente na alvenaria o respaldo da alvenaria deve ser arrematado com uma cinta, evitando a ‘’abertura’’ nos cantos e o esmagamento dos tijolos de
respaldo. A cinta, normalmente, consiste em uma viga de concreto armado, com a mesma espessura da parede e altura variável. A altura da cinta, tipo de armação e traço do concreto vai depender da carga atuante sobre a parede.
De acordo com Campos (S.D) “A função da cinta de amarração é distribuir
uniformemente tanto o peso da laje quanto sua movimentação, evitando trincas na alvenaria. ” Para manter a firmeza do conjunto de estrutura para pequenos vãos a cinta é necessária, não existindo uma verdadeira estrutura de concreto, é executada após a última fileira de tijolos, sendo assim desnecessário desnecessário executar o encunhamento. Servindo para apoio das lajes e para amarrar as paredes externas e internas. Portanto, devem ser corretamente niveladas, se as paredes
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Figura 7 –Caixaria para concretagem da cinta. Fonte: http://www.lanferarquitetura.com/2009/12/caixaria.html
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Existem dois tipos mais utilizados de vigotas, sendo de concreto armado e treliçadas. De acordo com Kehl e Vasconcellos (2012) As vigotas de concreto armado têm seção de concreto usualmente formando um “T” invertido, com armadura passiva totalmente
englobada pelo concreto da vigota. As vigotas treliçadas são constituídas por uma armadura em forma de treliça parcialmente englobada pelo concreto da vigota, cujo banzo inferior é envolto por uma placa de concreto estrutural, formando um conjunto pré-moldado de boa resistência e fácil manuseio. Posteriormente, em conjunto com o concreto, formarão as nervuras longitudinais da laje. (figura 9)
As tavelas são componentes componentes pré-fábricados, na na qual tem a funcionalidade de reduzir o volume de concreto e serve como forma para o concreto de capeamento. Os elementos de enchimento são componentes pré-fabricados de materiais inertes diversos, podendo ser maciços ou vazados, sendo mais comuns as tavelas de cerâmica ou de EPS. Possuem as faces inferior e superior planas e nas laterais, abas de encaixe para apoio, elas são colocadas entre as vigotas, que devem ser compatíveis com as dimensões das vigotas, para permitir o nivelamento da laje e evitar a fuga do concreto durante a concretagem (figura 9). O concreto de capeamento serve, por sua vez, não só de proteção à armadura, devido a sua natureza alcalina, mas também de elo de ligação entre a zona comprimida e a tracionada. No caso de momentos negativos, essa região estará submetida a tensões de compressão e, portanto, a qualidade do concreto é de suma importância para a resistência da laje.
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As dimensões das peças deverão ter dimensões padronizadas para o encaixe da vigota e tavela. De acordo com Kehl e Vasconcellos (2012) As vigotas em forma de “T” invertido , devem ter a sua altura maior ou igual a 8cm. As lajes pré-moldadas comuns vencem vãos até 5m entre os apoios. Em geral, os seus comprimentos variam de 10cm em 10cm. A vigota treliçada utiliza vergalhões soldados entre si formando uma treliça. Por isso, essa laje pode vencer vãos de até 12m entre apoios. Os blocos cerâmicos terão também suas dimensões padronizadas, com alturas de 7, 8, 10 e 12 cm, e largura suficiente para permitir um intereixo que não deverá ser superior a 50cm.
O escoramento é a primeira etapa na e xecução da laje pré- fabricada. De acordo com Kehl e Vasconcellos (2012) O escoramento deve ser feito antes da colocação das vigotas, apoiado em base firme. Sob as escoras, utilizar pedaços de tábua no sentido transversal ao das vigotas para uma melhor distribuição de cargas no solo. Todos os vãos acima de 1,30m devem ser escorados com linhas de escora colocadas no sentido inverso ao apoio das vigas. A contraflecha é utilizada como um recurso para compensar as consequências indesejáveis das deformações devidas à ação das cargas nas lajes. A contra-flecha, nem sempre necessária, deve ser aplicada na fase de execução do escoramento de acordo com o projeto de montagem da laje ou das medidas de contraflechas aplicadas. (Figura 10)
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A montagem inicia-se distribuindo as vigotas de cada cada vão de acordo com o sentido e tamanho indicado na planta de montagem. De acordo com Kehl e Vasconcellos (2012) É necessário que elas apoiem no mínimo 5cm sobre o respaldo das paredes ou vigas (Figura 11). Iniciar a montagem com a vigota junto a uma das extremidades da laje e prosseguir a distribuição colocando entre elas uma tavela em cada extremidade. Não deixar folgas e manter a distribuição sempre no esquadro. Colocar o restante das tavelas e marcar os pontos de luz com a colocação de tavelas já furadas ou da caixas de luz (Figura 13). Nunca deve-se caminhar diretamente sobre as tavelas, deverá ser utilizado tábuas para tr ansitar sobre a laje até a concretagem. (Figura 12)
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A armadura de distribuição deve deve ser utilizada em todas as lajes, lajes, devendo ser distribuída no mesmo sentido das vigas. A ferragem deve ser distribuída no sent ido transversal às vigotas com barras na bitola 5mm (3/16″) espaçadas no máximo a cada 30cm. Esta
armadura é importante, pois evita a fissuração do concreto de capeamento. A ferragem negativa é utilizada para garantir a situação de apoio das vigas tanto nas laterais como nos apoios intermediários formando a continuidade nos encontros de vigas (Figura 13). (Kehl e Vasconcellos, 2012)
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bem para preencher os espaços vazios, e também, deve ser socado com a colher de pedreiro para que penetre nas juntas das vigotas e tavelas, garantindo a solidez do produto. O traço do concreto de capa deve ser 1:2:3 com resistência mínima aos 28 dias de 18 a 20Mpa. Após a concretagem a laje deve ser molhada nos próximos 5 dias, para assim efetuar a cura, o escoramento somente pode ser tirado 21 dias após a concretagem para pequenos vãos e 28 dias para maiores vãos, sendo que nas lajes de forro é necessário que o escoramento só seja retirado após a conclusão da execução do telhado. (ARAÚJO, S.D; Kehl e Vasconcellos, 2012)
2.3- Revestimento
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água na proporção de 1:2. (www.amreparosereformasblogspot.com.br , 2012; www.pedreirao.com.br , S.D) Antes da aplicação do chapisco a estrutura e a superfície devem estar limpas, livres de irregularidades superficiais, preenchimento de furos e préumidecimento. De acordo com www.amreparosereformasblogspot.com.br (2012) O substrato deve estar firme, seco, curado e isento de óleo, graxa, pó, tinta, restos de desmoldantes ou compostos de cura. Para execução de chapisco sobre concreto, a limpeza deve ser rigorosa. Devem ser removidas as rebarbas, resíduos de concreto, pontas de arame e pontas de ferro. Resíduos de agentes desmoldantes devem ser completamente retirados através de lixamento/escovação e lavagem com jato de água. 24 horas antes da execução do chapisco recomenda-se aspersão de água em abundância. Para blocos de concreto e cerâmicos e tijolos cerâmicos, recomenda-se a molhar toda a superfície antes da execução do chapisco. Não se deve efetuar a aplicação de qualquer revestimento sobre substrato com temperatura superior a 30º C. Neste caso, é indicado o prévio resfriamento com aspersão de água. As superfícies porosas devem ser umedecidas
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Figura 14 – Arremesso do chapisco. Fonte:http://pedreirao.com.br/geral/alvenarias-e-reboco/como-executar-chapisco-passo-apasso/
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A alvenaria tem que ter sido executada com qualidade em relação ao prumo, alinhamento, esquadro e qualidade dos tijolos ou blocos para conseguir as espessuras ideiais de reboco, o externo tem espessura média de 2cm e o interno de 1,5cm. Paredes que apresentam alguns dos problemas citados fazem com que o reboco possa engrossar sua espessura, aumentando o consumo de argamassa, elevando o custo do serviço. (www.blogdomenorpreco.com.br , 2013) Antes de aplicar o reboco nas paredes elas já devem ter sido sido chapiscadas chapiscadas,, então executa-se as mestras ou taliscas do reboco, na qual definem a espessura do reboco e guiam o sarrafeamento da parede. De acordo com APEX Engenharia (2011) As taliscas devem ser preferencialmente de cacos de azulejos, assentadas com a mesma argamassa que será utilizada para a
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Além disso, com a desempenadeira de pedreiro é feito o acabamento da massa em movimentos circulares retirando os excessos que a r égua de alumínio não consegue retirar (Figura 19), e com a trincha é jogado um pouco de água nos lugares onde a massa já está mais seca e difícil de passar a desempenadeira,
até
a
superfície
(www.blogdomenorpreco.com.br , 2013)
ficar
lisa
e
bem
acabada.
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3- Atividades desenvolvidas 3.1 - Alvenaria Convencional Convencional Para o início da execução da alvenaria foi necessário realizar a viga baldrame, um tipo comum de fundação rasa para pequenas edificações, onde foi concretada e após a cura foi retirado as formas e impermeabilizada.
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