TREES FILTER BOX OF LOW IMPACT DEVELOPMENT WITH PRETREATMENT FILTRATION FACILITY

摘要

The present invention relates to a tree box filter of low impact development having a pre-treatment filtration facility. The objective of the tree box filter of the present invention is to prevent unfiltered nonpoint pollution source and heavy metals from flowing into a vegetation space part, and to discharge a great quantity of rainwater by being able to prevent blockage of a discharge hole formed in the vegetation space part. The objective is achieved by the tree box filter including: a filter box wherein an inlet is formed at one side and which is divided into a filter space part and the vegetation space part inside; a screen net which is formed to remove foreign substances during rainwater inflow by being located at a lower part of the inlet, while being installed to have one end separably combined with an upper part of one plane of the filter space part of the filter box; a filter part which supplies the rainwater flowed in through the inlet hole to the vegetation space part by filtering the nonpoint pollution source and the heavy metal and calcium chloride included in the rainwater while being installed at one side or the other side or both sides of the screen net by being inserted into the filter space part of the filter box; and a vegetation soil protection filter layer which prevents vegetation soil from being scattered by being filled in a vegetation soil layer and an upper part of the vegetation soil layer so that trees planted in the vegetation space part of the filter box can grow, and also can filter the nonpoint pollution source and the heavy metal included in the rainwater flowing in from a sidewalk.