Esquema de construção de abastecimento de água enterrada municipal de tubo PE: conexão hot melt e resposta de assentamento

2025-08-18


PE tubo é amplamente utilizado no abastecimento de água enterrada municipal devido à sua resistência à corrosão e forte flexibilidade. Durante a construção, é necessário focar no controle da qualidade da conexão hot melt e medidas de liquidação para garantir a operação estável a longo prazo do sistema de abastecimento de água.

conexão hot melt é o processo de conexão principal do tubo PE, e é necessário seguir rigorosamente as especificações de operação. Antes da construção, a aparência do tubo deve ser verificada para garantir que não haja arranhões, depressões e a porta seja plana. Ao usar um soldador hot melt especial, a temperatura de aquecimento (geralmente 19010 ° C) e o tempo de aquecimento devem ser definidos de acordo com as especificações do diâmetro do tubo. Depois que a placa de aquecimento mostrar um estado derretido uniforme, conecte rapidamente o tubo e mantenha a pressão especificada até que a interface esfrie e solidifique. Após a conclusão da conexão, é necessário verificar se a interface formou flanges uniformes, sem soldagem virtual, fenômeno de soldagem por vazamento e realizar teste de pressão, se necessário. A pressão de teste não é inferior a 1,5 vezes a pressão de trabalho, e a retenção de pressão por 30 minutos sem queda de pressão é qualificada.

Para os problemas comuns de assentamento de fundações na construção municipal, medidas de prevenção e controle precisam ser tomadas a partir de vários elos de projeto e construção. Antes da colocação do oleoduto, o levantamento geológico deve ser realizado e a camada de solo mole deve ser tratada com areia graduada e substituição de cascalho, e o grau de compactação deve ser colocado em camadas de 90%. A fundação do oleoduto deve ser feita de almofada de areia de 150 mm de espessura e pilares de suporte de concreto devem ser adicionados na interface para reforço. Ao enchimento, solo plano ou areia com um tamanho de partícula de 50 mm deve ser selecionado, e a altura do enchimento em camadas não deve exceder 300 mm. Um rolo leve deve ser usado para compactação para evitar o rolamento mecânico direto do oleoduto. Para atravessar seções de estradas ou áreas geologicamente complexas, "pontes de tubos" podem ser colocadas ou compensadores de foles podem ser configurados para compensar a tensão de assentamento usando a flexibilidade do próprio tubo PE.

o processo de construção também precisa prestar atenção ao ajuste de adaptação ambiental. Durante a construção no inverno, o tubo deve ser pré-aquecido a mais de 5 ° C antes da conexão de fusão a quente para evitar rachaduras quebradiças de baixa temperatura; durante altas temperaturas no verão, medidas de sombreamento devem ser tomadas para evitar que o tubo se expanda e deforme termicamente. Ao mesmo tempo, faça registros de construção, incluindo parâmetros de fusão a quente, dados de tratamento de fundação, resultados de observação de assentamento, etc., para formar um arquivo técnico completo para fornecer uma base para operação e manutenção posteriores. Através da aplicação científica da tecnologia de conexão de fusão a quente e da tecnologia de prevenção e controle de assentamento, a segurança e durabilidade do sistema de abastecimento de água do tubo PE podem ser efetivamente melhoradas para atender às necessidades de operação de longo prazo da engenharia municipal.

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