做防水試驗和保證良好的排水系統建造屋頂花園,必須進行二次防水處理。首先，要檢查原有的防水性能:封閉出水口,再灌水,進行96小時(4天4夜)的嚴格閉水試驗。閉水試驗中,要仔細觀察房間的滲漏情況,有的房屋連續閉水3天不漏,第四天才開始滲漏。若能保證96小時不漏,說明屋面防水效果好。這種防水效果,也可適用于非屋頂花園的情況。防水層是保證屋頂不漏的關鍵技術問題,但屋頂防水和排水是兩個方面,因此還必須處理好屋頂的排水系統。在屋頂園林工程中，種植池、水池和道路場地施工時，應遵照原屋頂排水系統,進行規劃設計，不應封堵、隔絕或改變原排水口和坡度。特別是大型種植池排水層下的排水管道,要注意相關的標準差，使種植池排水層下的排水管道與屋頂排水口配合，同時注意相關的標高差，使種植池內的多余灌水能順暢排出。
To conduct waterproof test and ensure good drainage system, secondary waterproof treatment must be carried out for the construction of roof garden. First of all, check the original waterproof performance: close the water outlet, then fill water, and conduct a strict closed water test for 96 hours (4 days and 4 nights). In the closed water test, carefully observe the leakage of the room. Some houses do not leak after closed water for 3 days, and the leakage begins on the fourth day. If no leakage can be ensured for 96 hours, it indicates that the roof waterproof effect is good. This waterproof effect can also be applied to non roof gardens. Waterproof layer is the key technical problem to ensure that the roof does not leak, but roof waterproof and drainage are two aspects, so we must also deal with the roof drainage system. In the roof garden project, during the construction of planting pond, pool and road site, the planning and design shall be carried out in accordance with the original roof drainage system, and the original drainage outlet and slope shall not be blocked, isolated or changed. In particular, for the drainage pipeline under the drainage layer of large-scale planter, pay attention to the relevant standard deviation, make the drainage pipeline under the drainage layer of planter cooperate with the roof drainage outlet, and pay attention to the relevant elevation difference, so that the excess irrigation in the planter can be discharged smoothly.
不損傷原防水層實施二次防水處理,最好先取掉屋頂的架空隔熱層，取隔熱層時，不得撬傷原防水層。取后要清掃、沖洗干凈,以增強附著力。在一般情況下,不允許在已建成的屋頂防護水層上再穿孔洞、管線或預埋鐵件與埋設支柱。因此,在新建房屋的屋頂上建屋頂花園時,應由園林設計部門提供屋頂花園的有關技術資料。如:將欲留孔洞和欲埋件等資料提供給結構設計單位,并由他們將有關要求反映到建筑結構的施工圖中，以便建筑施工中實現屋頂花園的各項技術要求。如果在舊建筑物上增建屋頂花園,無論是哪種做法的屋面防水層,均不得在屋頂上穿洞打孔、埋設鐵件和支柱。即使一般設備裝置也不能在屋頂上“生根”,只能采取其他措施使
Do not damage the original waterproof layer and carry out secondary waterproof treatment. It is best to remove the overhead thermal insulation layer of the roof first. When taking the thermal insulation layer, do not pry the original waterproof layer. Clean and rinse after removal to enhance adhesion. In general, it is not allowed to pass through holes, pipelines, embedded iron parts and embedded pillars on the built roof protective water layer. Therefore, when building a roof garden on the roof of a new house, the garden design department shall provide relevant technical data of the roof garden. For example, provide the data such as holes and embedded parts to the structural design unit, and they will reflect the relevant requirements into the construction drawings of the building structure, so as to realize the technical requirements of the roof garden in the building construction. If a roof garden is added to an old building, no matter what kind of roof waterproof layer is used, holes shall not be drilled or iron parts and pillars shall be buried on the roof. Even ordinary equipment and devices can not "take root" on the roof, and other measures can only be taken to make it
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