Remedy for a dangerous deck
Howdy. I was visiting a man’s getaway cabin and when I looked at his cantilevered deck, I heard in the back of my mind: “Danger Will Robinson!”
为清楚起见包括图像。
危险：
1. 4ft Cantilever with 2×8.
2. Only two of the 6 structural 4×6 posts in ground.
Situation:
1.甲板脱离了陡峭的路堤，悬挂在水面上约9英尺。
2.它有8ea 4×6个柱，其中只有6个阻挡梁，其他两个恰好连接到外部托梁上。
3. Off the 8 posts only 2 are in the ground and these are immersed in permanently soaked soil as they are just a couple feet from lake and the 4″ side of post is taking all the lateral for the entire deck, aside from friction that the walkway onto deck and other posts provide (next to nothing).
4. The other 6 posts are setting on top of the ground on different items (soil, rock, or block with no attachments.
5.甲板是16英尺X16英尺，在2-2×12梁的顶部的中心，位于2×12梁12英尺的顶部，并由三个帖子8ft o.c。
6.甲板有一个4英尺的悬臂。
7.？外侧2×8托梁在它们下方立即有2×12，因此它们在外部托梁外保持2×20。悬臂末端的2×8个标题托梁在其下方具有另外2×8，其实质上是2×16。
Good:
1. 2×8 joists 12″ O.C. spanning 12ft provides a wopping 100 PSF.
2. 2-2×12梁支撑每8英尺在甲板的可接受限度范围内（不是100PSF），但它们只是行走，而不是放置按摩浴缸。
现实：
1.悬臂限制应为2×8，而不是48“
2. The two 4×6 posts providing 3.5″ of lateral support looks like a nightmare happening free standing about 6-7 ft out of ground and the additional fact it is several years old.
我警告说，他不安全。如果那件事失败了，它可能会下降，进入水中，真的伤害某人的人老年人，年轻，或者在碎片中缠绕的冲击或纠缠在一起。
He is planning to have 20 family members out there next week for Thanksgiving and wanted me to see what I can do to render it SAFE. If that thing went into the water with half his guests on there, it would surprise me if it did not end in at least one fatality.
我不确定该怎么办？
Ideas:
1.交叉支撑4×6，并在混凝土和镀锌附件或进入地球和一些钢电缆的镀锌螺钉中添加某种地球锚，以防止甲板向水/下坡侧移动。
2. Lift the deck and put in new posts embedded into the ground, or on sono tubed concrete, and add cross brace, and eliminate the cantilever problem somehow, set deck back onto new structural supports.
3.拆迁并重新开始。
你怎么看待1号的想法？
谢谢你。
GBA Detail Library
由气候和房屋部件组织的一千个建筑细节的集合
答复
这里有两个添加清晰度的照片。不能为我的生活了解照片如何在手机上右侧，笔记本电脑上，但上传时没有？对不起。
为什么照片旋转：EXIF标题中有一个标志，说他们应该旋转，可能是由手机设置的。简单的解决方案？屏幕拍摄或复制照片，保存到新文件。问题解决了。
那里有很多结构问题，你是对担心的。通过互联网论坛发现修复不是最好的方法。
我会得到一个结构工程师来规范细节。你至少需要：
- 所有列的 - 两个方向交叉支撑）
- 柱子和主光束之间的接线（滞后螺栓只有一个大的否）
工程师也可以帮助悬垂。
嗨迈克。
我是第二个akos的意见。获得一些本地专业帮助。
I've had problems with pics getting flipped when I post too. I don't know why that happens -- it seems to be random.
你不应该让螺栓拿起像所示一样。托梁应静止在柱的顶部，或者在切入柱中的凹口中，使得螺栓刚刚将组件保持在一起，但实际上没有携带任何负载。如果您实际上需要螺栓拿起负载，你必须担心木材中的剪切应力，并使用分级硬件（不是通常的“2级”硬件商店的东西），因此它变得更加复杂。
I'd have a structural engineer review this and come up with a fix. My guess is there will be a number of changes you'll need to make.
我自己的建议在这里提及工程师：
1- Possibly use some steel in that cantilevered span to eliminate the need for the outermost columns. This will get your ground attachments further away from the water for less erosion and weathering issues.
2-可能使用螺钉桩而不是用于列的接地附件混凝土。如果孔不能在浇注过程中不能保持水，混凝土有时可能难以在水面附近工作。螺钉桩没有这个问题。
账单
谢谢男人。螺栓剪切良好的抓住。我确实看到了，但它被忽视了，因为我刊登了长期的帖子，并专注于如何传达更加罕见的错误。我已经跑进了螺栓剪切多次，但疯狂的悬臂和帖子问题永远不会。
麦克风，
你可能会发现这个有用：
https://awc.org/pdf/codes-standards/publications/dca/AWC-DCA62015-DeckGuide-1804.pdf
仅关于悬挂器问题 -
The cantilever distance is determined by the length of the the joist.
As is stated in the DCA6 provided by Malcolm.
悬臂可以是托梁跨度的1/4。
With a 16' deck joist and a 4' cantilever. That means the span is 12' from ledger to beam.
所以最大悬臂为36“。
假设适当的托梁尺寸开始。此外，它是1/4主要托梁跨度或图表引用的图表L（o）。
任何人都知道为什么L（O）对于某些情况下更紧密的托床间距较小？IE。2x8 syp托梁可以悬挂2'-4“当在24英寸的中心时，但只有1'-10”在12英寸中心？
我猜想这些较短跨越的原因是因为如果没有缩短稍微缩短，则较近跨越较近跨度的允许的PSF负荷将剪切应力推入悬臂梁的枢轴点处的危险区域。
基本上，我认为他们假设较近的间距是允许更高的楼层负载，并且木材的最终允许剪切强度变得更像是一个问题。
I can’t think of any other reason the table would be setup the way it is.
账单
I would not worry about the cantilever, it is all the things that cannot be seen
如何附加到建筑物上的甲板，帖子中的帖子是什么，附件的职位
甲板不太可能从悬臂上翻转到水中，失败模式是柱子失败的侧面方式，整个甲板表面变为平行四边形，随着螺栓穿过附件的木材拉动
正确的答案是不要让一群人在甲板上发出
法律答案是发布标志，说甲板是一个pos
如果我被迫尝试做某事，因为我的控制别的情况否则我会：
Diagonally brace each post in both directions minimum 4 foot long diagonals. Min 2x4
在甲板托梁下运行一对5 / 4x6对角线，拧到每个甲板托梁，从外角朝向房子的中心
试着确保房子的附件和它一样好
将一些timberclocks风入柱子或托梁
或者你可以用电锯举行派对的早晨，从房子里切掉整个东西............
重建那些混乱。
Get flashing details at house correct and structural design.. Consider simplifying the design.
Nothing better than a solid deck. Except one with a panoramic mountain view like mine!
身为法院的一名工程师,我的警钟不是much "Danger Will Robinson," but the team of attorneys that are waiting in the wings. If you touch a POS like that, you own it and its liability. Even a well-crafted waiver isn't going to help much if someone gets killed. If you do try to improve this deck as a "favor", drive a rented truck, get paid in cash, and wear a fake beard and hoodie.
In all seriousness, there are so many issues with that deck that fixing them in place would cost more than tearing it down and starting from scratch. Doing things right sometimes costs actual money. But when the downside of doing things wrong is a serious risk of bodily harm, is the view from your cheap-ass homebuilt deck really worth it?
Agreed, Peter.
No legitimate contractor could sleep at night knowing he’s responsible for future failure.
Any fly-by-night contractor would only be adding lipstick to it. Be safe!
我很愉快，惊讶于斯科特·吉布森在这个问题上完成了问答：//m.etiketa4.com/article/how-to-fix-a-dangerous-deck