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限重300公斤

工程先生

工程先生

專欄摘要

我問過身邊不少同業,大部分的人第一時間都答不出來。

限重300公斤

不知道你有沒有注意過鷹架上的限重帆布?有些寫 250 公斤,有些寫 300 公斤,字面意思很好懂,但你有沒有想過:這個重量指的是「整層橫排」的限重,還是「整列縱向」的總和?

我問過身邊不少同業,大部分的人第一時間都答不出來。

其實答案就藏在施工架計算書裡。鷹架在做極限承載計算時,看的並不是單一片踏板會不會斷,而是看最底下的那支「門型架」何時會產生挫屈。

挫屈是指細細長長的柱子,受到壓力之後,彎曲或側向變形,無法再承受壓力的狀態。

換句話說,這 300 公斤的限重本質上是看「整列縱向」的載重,而不單是橫向的承載。

很多人會直覺理解成「單一踏板上面可以站 300 公斤的人或料」,這樣理解雖然簡單,但在某些極端狀況下,這種沒人解釋過的觀念模糊,就有可能造成結構性的危險。

這些觀念及內容,我把它整理在第三章的第 18 單元的「鷹架工程」裡了。

關於無障礙空間:消失的「降板」

「降板」在營造界不是什麼新概念,但奇怪的是,現在有些 3~5 年內的新大樓,居然還是會出現不做降板的狀況。

拿我租的停車場來說,電梯口規劃成無障礙空間,理論上不能有門檻,因為法規的假設是輪椅要過,輪椅過的時候有門檻,就會造成他們進出不方便。

但因為結構沒做降板,導致梯廳跟停車場的裝修材銜接時產生高低差,最後只能做一個很醜的斜坡(如照片所示)。

0408-限重300公斤-2.jpg

在有施工圖規劃部門或大型營造廠裡,這本該是基本功。透過「軀體圖」預先做好施工規劃,其實並不會多花什麼錢,頂多是模板面積多一點,施工廠商可能會跟你以點工計價而已。

但做出來的質感實在是差很多。

比起用昂貴建材把大廳弄得金碧輝煌,我覺得這種對工法細節的在乎,才是對自住者來說更有價值的參考指標。當然,降板絕對不是隨便組個模、把鋼筋壓低,或把混凝土打薄就能解決的事。

實際施作時,還有關於「增打、降板」的介面要做的結構處理,這些內容我也一併放在第 19 單元了,有興趣的朋友可以去看看。

▸ 課程連結:https://engineeringlifetw.kaik.to/gqzrd

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