喷射切割过程

E.ver stick your thumb across the end of a garden hose ad notice how the speed of the water increases? That’s called the Venturi Effect. When you restrict the volume of pressurized water passing through an opening, its velocity increases in proportion to the amount of restriction.喷射切割uses this same principal to cut a tunnel through the earth for atrinstallation。水喷射是一款在牙齿行业的工具箱中还有一个工具。

jet Cutting Basics

一世nstead of the low water pressure from a garden hose, though, jet cutting, also known as water jetting, uses a high-pressure pump to boost the volume of water, raise its pressure to hundreds ofpounds-per-square-inch，并用特殊喷嘴取代拇指。水射流产生浆料mudin the bore. The mud does two things: it consolidates the钻孔walls and it creates the need to remove the muddy泥浆from the bore.

水射流的喷嘴提高了水流的压力，但一旦水离开喷嘴，压力开始下降，喷射水的直径开始膨胀。必须考虑两种因素，以规划使用水射流的项目。

真空挖掘机technology, which has been around since the mid-1960s and includes both a water jetting function as well as an industrial-strength Shop Vac-like suction/mud vacuuming function, provide an answer about removing the mud formed by the dirt that mixes with the high-speed water from the water jet. The water jet and the vacuum suction head can go downhole together, by design. As the nozzle forces its way into the bore (the water jet is only effective for a few feet at a time), the suction head vacuums the muddy water out of the borehole, leaving the muddy cake on the wall of the hole. (Also read "看水电真空挖掘。“）

水W.orks Better...

就像飞行装置一样传统的挖沟work, water jetting, as a form of trenchless technology, has some unique advantages over other trenchless methods. Water jetting might make a job-saving difference for projects in areas where a proliferation of underground utilities could mean damage claims resulting from soil expansion that cracks adjacent pipes or conduits.

这是因为真空挖掘机将孔切割到设计规范中，只有最小的土壤膨胀，土壤被稀释成泥浆浆料并立即从孔中取出（并且因为水射流没有压力通过管子或混凝土切割，地下实用管道）。

一种nother benefit is that immediately adjacent utilities aren't an issue, public safety is a non-issue. No burst sewer lines or flooding streets. No exploding gas lines throwing manhole covers 20-feet into the air. Also included in the benefits package are all the benefits of a trenchless installation, including a lack of surface disturbance and a hindrance to the public.

这意味着水射流在哪里安全起见augersand练习可以拼写灾难。

喷射切割的缺点

水喷射requires special training and the process can be time-consuming. The first part of that statement, training, is part of business-as-usual. The second; art, though, means it's not an option for jobs where contractual obligations impose rigorous-but-reasonable time limits. If your customer has to have it done by (whenever), you'll do what's needed to get the job done by that date, short of endangering your crew or the public. And that may be a selling point for municipalities or even private parties.

例如，如果最直接的话design path连续项目本质上是一个清楚,200-foot run – except for a 20-foot-wide hornet's nest of massed utilities a foot from where you'll make your final connection – water jetting under, around or through that hornet's nest makes sense. You won't be sued for damages to those utilities, nor will your customer, by irate utility customers whose homes were damaged or destroyed by a totally avoidable gas main explosion. (Read "T.he Science of Getting it Right: Locating Underground Utilities。“）

这对周到承包商包括使用喷射切割系统（至少）在其估计，投标和合同以及周到的公用事务委员会或委员会超出预算的可能性的强烈激励。（阅读更多“如何竞标该城市项目。“）