穿孔式橋(qiao)式濾水管 穿孔式濾水(shui)管是在井管上(shang)(shang)構成(cheng)一(yi)定幾何(he)形狀(zhuang)和一(yi)定規(gui)律布(bu)置的進(jin)水(shui)孔眼而成(cheng)。這(zhe)種掛(gua)水(shui)管只能(neng)直(zhi)接使(shi)用于粗(cu)砂(sha)以(yi)上(shang)(shang)的含水(shui)層中。因其進(jin)水(shui)孔眼的幾何(he)形狀(zhuang)不同(tong)，大致(zhi)又(you)可分為兩(liang)種: 圓孔(kong)(kong)(kong)(kong)(kong)式濾水管(guan)(guan)這是歷史簡單的(de)(de)(de)一(yi)種(zhong)型式。其孔(kong)(kong)(kong)(kong)(kong)眼(yan)(yan)(yan)(yan)(yan)可(ke)很據不同管(guan)(guan)材而用不同方法制成。一(yi)般(ban)對(dui)金屬管(guan)(guan)和石棉水泥管(guan)(guan)多用鉆孔(kong)(kong)(kong)(kong)(kong)或沖壓而成，而對(dui)混凝土管(guan)(guan)只能在(zai)澆筑(zhu)成型時預(yu)留圓孔(kong)(kong)(kong)(kong)(kong)。其孔(kong)(kong)(kong)(kong)(kong)眼(yan)(yan)(yan)(yan)(yan)的(de)(de)(de)大小主要(yao)按(an)含(han)水層的(de)(de)(de)順粒粒徑而定，進(jin)水孔(kong)(kong)(kong)(kong)(kong)眼(yan)(yan)(yan)(yan)(yan)在(zai)管(guan)(guan)壁上的(de)(de)(de)布置形式，通常(chang)多采用交錯的(de)(de)(de)梅花形。進(jin)水孔(kong)(kong)(kong)(kong)(kong)眼(yan)(yan)(yan)(yan)(yan)的(de)(de)(de)相(xiang)互位(wei)置，還(huan)可(ke)以(yi)分為等映三角形與(yu)等邊三角形兩種(zhong)。這樣初步選定出進(jin)水孔(kong)(kong)(kong)(kong)(kong)眼(yan)(yan)(yan)(yan)(yan)布置的(de)(de)(de)水平與(yu)垂直孔(kong)(kong)(kong)(kong)(kong)距后，還(huan)應按(an)對(dui)不同管(guan)(guan)材所要(yao)求的(de)(de)(de)開孔(kong)(kong)(kong)(kong)(kong)率(lv)再加以(yi)調正(zheng)，調整使其孔(kong)(kong)(kong)(kong)(kong)距基本為整數時以(yi)便(bian)于加工。