Trench shield

Image of the trench box in situ with chains still attached and the escape ladder in place

Trench shields (also called Trench Boxes or Trench Sheets) are steel or aluminum structures used for protecting utility workers while performing their duties within a trench. They are customarily constructed with sidewalls of varying thicknesses held apart by steel or aluminum spreaders. Spreaders can be interchanged to match the width of the trench. The different materials and building designs lead to a variety of depth ratings, i.e. the depth of a trench that the shield can withstand a collapse without buckling. Depth ratings are determined by registered professional engineers.

单词	Trench shield
释义	Trench shield 英语百科 Trench shield Trench shields (also called Trench Boxes or Trench Sheets) are steel or aluminum structures used for protecting utility workers while performing their duties within a trench. They are customarily constructed with sidewalls of varying thicknesses held apart by steel or aluminum spreaders. Spreaders can be interchanged to match the width of the trench. The different materials and building designs lead to a variety of depth ratings, i.e. the depth of a trench that the shield can withstand a collapse without buckling. Depth ratings are determined by registered professional engineers.
随便看	testosterone receptor的意思 testosterone repressed prostate message的意思 testosterone的意思 testosterone sublingual的意思 Testosterone Sulfate的意思 testosterone supplementation的意思 testosterone suspension,sterile的意思 testosterone,T的意思 Testosterone Undecamoate的意思 Testosterone Undecanate的意思 Testosterone undecanoate的意思 Testosterone Undecanoate Capsules的意思 Testosterone Undecanoate Injection的意思 Testosterone Undecanoate Soft Capsules的意思 testosteronic的意思 testosteroni propionas的意思 Testosterore propionate的意思 testoterone的意思 testoterone estrogen binding globulin的意思 testoterone supplementation的意思 test ouchterlony的意思 Testour的意思 test out的意思 test ... out的意思 Test,Ovarian Function的意思