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            首頁 >> 科技頻道 >> 農膜技術 >> 正文
             

            春季拱棚如何加強防風

            (發布日期:2019/3/5 15:10:41)
            瀏覽人數:
            風大、沙塵多是春季最常發生的氣象災害,幾乎每年都有。春季發生大風時,經常會出現拱棚棚膜被刮壞甚至刮倒,損失很大。近年來雖然國家加強了退耕還林、退耕還草的力度,但總體來看,北方植被狀況沒有得到根本性的好轉,未來風災的發生幾率很大,尤其是我們常說的沙塵暴將變得十分頻繁。在這里特別提醒菜農朋友,一定要注意加強拱棚的防風能力。 

              提高拱棚抗風能力 

              提前做好防風準備,是減少大風為害的根本。 

              首先是加固立柱,更換老舊竹竿,上好棚膜,這是提高拱棚抗風能力的基礎。上膜的松緊度、通風口的設置對抗風能力的影響極大。上膜時要選無風晴朗天氣,一定要抻緊后再上,不能讓棚膜松松垮垮,這樣上膜后棚膜的活動幅度小,不容易被風鼓動,也就不容易破損。 

              還要注意上膜時通風口的設置,兩膜重疊部分最好在25-30厘米,以保證拱棚的密閉性。不必太寬,以免影響通風,尤其是夏季高溫時通風口開不大,影響棚室降溫;也不能太窄,避免遇到大風時通風口關不嚴,風進棚內鼓動棚膜,破壞性更強。 

              再次是做好重點部位的防風工作。根據多年的經驗來看,拱棚附近如果存在較高的物體,如房屋、樹木等,大風會因這些物體的阻擋而形成氣旋或亂流,特別是這些物體在拱棚正南方向時,回旋的氣流被阻擋后下降,通過棚南側縫隙進入棚內,造成棚內氣壓不一致,可能會將棚膜鼓破。建議拱棚附近有高大物體的菜農,增加壓膜繩的數量,門口設置雙層薄膜,把拱棚出入口封堵嚴密,阻止氣流進入。 

              加強大風期間巡查 

              大風會鼓動棚膜,弱通風口設置不合理,很可能被刮開,造成棚內氣壓變動,影響棚室結構。尤其是棚面角度小、兩邊較高的拱棚,對風的阻擋力較大,若通風口不嚴,氣流通過棚面時容易造成棚內外壓力不一,將棚膜鼓破,嚴重的可能會導致整個拱棚坍塌。這樣的拱棚要注意改造,加強兩側立柱的承受能力,增加棚面壓膜繩的數量,關嚴通風口,提高棚體的抗風能力。大風期間,一定要注意做好巡查,觀察通風口狀況和棚內氣壓變化,及時調整,避免出現鼓破棚膜甚至刮倒棚體的情況。

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