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井盖上随时有车辆行人经过，运用圆形
井盖上随时有车辆行人经过，运用圆形，主要是思索到圆形的井盖经过其圆心的每条直径长度都是一样的，这样假设井盖被经过的车辆轧起时，由于不论如何轧起，三防井盖价格，其直径都会比下面的井口略宽，井盖不会掉到井口里去。
On the covers at any time after use of vehicles and pedestrians,
circular, mainly considering the circular covers through its center of
each diameter length is the same, so that covers were passing vehicles
rolled up, because no matter how rolling, three cover price, its
diameter than the following Iguchi Hiro, will not fall into the manhole
cover well go.
而假设采用方形，由于方形的对角线清楚擅长其每条边长，这样的井盖被轧起时，很容易沿井口的对角线方向掉进井中，构成安全隐患。
Assuming that the square is used, because the square diagonal is clear
and good at every side length. When such a well cover is rolled up, it
is easy to fall into the well along the diagonal line of the well head,
which constitutes a hidden danger of safety.
也许有人会问，假设井口做成圆形或清楚小于井盖，方形的井盖就不会掉进井中。这里就牵涉到一个材料的大运用和糜费的效果。井口的运用取决于井口的大小，假设非要在上面按个面积远远大于井口的方形井盖，那麼材料的运用和适用价值自然没有直接运用圆形的井盖更有效，防盗井盖，既糜费井盖的材料，也保证了井口的安全。1、窨井设在大路上，每天走路的人来人往，设计时就要留意行人的安全，盖儿不能掉到窨井里。假设设保定平面设计培训 防撞墙模具 防撞墙模具 防撞护栏模具 大棚遮阳网 遮阴网计成三角形或许正方形的，盖儿虽然比窨井口大一些，但还是有掉下去的可以。而假设是圆形的，由于圆的直径相等，所以，盖儿只需大一点点，就不会掉下去。
Some people may ask that a square hole cover will not fall into the well
if the wellhead is made round or clearly less than the cover of a well.
This involves the use of a material and the effect of wasting. Well use
depends on the size of the wellhead, assuming that the non square
manhole cover in the top press area is far greater than the wellhead,
then the use of materials and the applicable value of nature does not
directly use the circular covers more effective, not only covers the
manhole cover, waste materials, also ensure the safety of wells. 1, the
manhole located in the road, walk every day when you have to pay
attention to the design People are hurrying to and fro., pedestrian
safety, lid cannot fall into the manhole. If the design is a triangle or
a square, although the lid is larger than a well - scented hole, it can
still fall off. Assuming that it is round, because the diameter of the
circle is equal, the lid only needs a little bigger, so it won't fall.
