Plastic infiltration unit and system

Abstract

There is provided a plastic infiltration unit comprising: a top deck, at least one pillar extending from the top deck, wherein the at least one pillar includes a plurality of compartments, wherein at least one of the compartments is laterally enclosed, and wherein the top deck and the at least one pillar are produced in one piece. There is further provided a plastic base plate for use with a plastic infiltration unit. There is further provided a plastic infiltration unit side plate. There is yet further provided a plastic infiltration system for deployment underground comprising a plastic infiltration unit and a plastic base plate, wherein the at least one pillar of the plastic infiltration unit is received at the receiving location of the plastic base plate.

1 - 37 . (canceled) 
     
     
         38 . A method of manufacturing an injection molded plastic pillar for an infiltration unit, the method comprising forming a plastic pillar having a central compartment and at least one further compartment, wherein the at least one further compartment surrounds, at least in part, the central compartment, wherein the at least one further compartment extends in a same longitudinal direction as the central compartment, the method further comprising: injecting plastic into a mold for the pillar, the mold comprising a core for the central compartment and a core for the at least one further compartment, withdrawing the core for the at least one further compartment in one direction, withdrawing the core for the central compartment in a direction different from the one direction. 
     
     
         39 . The method according to  claim 38 , wherein the different direction is an opposite direction. 
     
     
         40 . The method according to  claim 38 , comprising the step of withdrawing the core for the at least one further compartment before withdrawing the core for the central compartment. 
     
     
         41 - 60 . (canceled) 
     
     
         61 . A plastic infiltration unit pillar comprising a plurality of compartments extending in a longitudinal direction, wherein the pillar has an internal structure comprising a central compartment surrounded, at least in part, by at least one surrounding compartment, wherein at least one of the compartments is laterally enclosed, and wherein the at least one surrounding compartment has a draft angle extending in one direction and the central compartment has a draft angle extending in the opposite direction. 
     
     
         62 . The plastic infiltration unit pillar according to  claim 61 , wherein the central compartment has a draft angle, which is substantially zero so that a vertical force is conducted from one pillar to another pillar when the pillars are stacked on one another. 
     
     
         63 . The plastic infiltration unit pillar according to  claim 61 , wherein the cross section of the pillar is substantially constant along its length. 
     
     
         64 . The plastic infiltration unit pillar according to  claim 61 , wherein the length of the pillar is adjustable. 
     
     
         65 . The plastic infiltration unit pillar according to  claim 61 , wherein the pillar includes markings to indicate a plurality of lengths to which the pillar can be adjusted by cutting. 
     
     
         66 . The plastic infiltration unit pillar according to  claim 61  in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length. 
     
     
         67 - 74 . (canceled) 
     
     
         75 . The method according to  claim 39 , comprising the step of withdrawing the core for the at least one further compartment before withdrawing the core for the central compartment. 
     
     
         76 . The plastic infiltration unit pillar according to  claim 61 , wherein the cross section of the pillar is substantially constant along its length. 
     
     
         77 . The plastic infiltration unit pillar according to  claim 76 , wherein the length of the pillar is adjustable. 
     
     
         78 . The plastic infiltration unit pillar according to  claim 77 , wherein the pillar includes markings to indicate a plurality of lengths to which the pillar can be adjusted by cutting. 
     
     
         79 . The plastic infiltration unit pillar according to  claim 78  in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length. 
     
     
         80 . The plastic infiltration unit pillar according to  claim 76 , wherein the pillar includes markings to indicate a plurality of lengths to which the pillar can be adjusted by cutting. 
     
     
         81 . The plastic infiltration unit pillar according to  claim 80 , in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length. 
     
     
         82 . The plastic infiltration unit pillar according to  claim 62 , wherein the length of the pillar is adjustable. 
     
     
         83 . The plastic infiltration unit pillar according to  claim 82 , wherein the pillar includes markings to indicate a plurality of lengths to which the pillar can be adjusted by cutting. 
     
     
         84 . The plastic infiltration unit pillar according to  claim 83 , in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length. 
     
     
         85 . The plastic infiltration unit pillar according to  claim 62 , wherein the pillar includes markings to indicate a plurality of lengths to which the pillar can be adjusted by cutting. 
     
     
         86 . The plastic infiltration unit pillar according to  claim 85 , in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length. 
     
     
         87 . The plastic infiltration unit pillar according to  claim 63 , wherein the length of the pillar is adjustable. 
     
     
         88 . The plastic infiltration unit pillar according to  claim 61 , wherein the pillar includes markings to indicate a plurality of lengths to which the pillar can be adjusted by cutting. 
     
     
         89 . The plastic infiltration unit pillar according to  claim 88 , in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length. 
     
     
         90 . The plastic infiltration unit pillar according to  claim 63 , wherein the pillar includes markings to indicate a plurality of lengths to which the pillar can be adjusted by cutting. 
     
     
         91 . The plastic infiltration unit pillar according to  claim 90 , in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length. 
     
     
         92 . The plastic infiltration unit pillar according to  claim 64 , wherein the pillar includes markings to indicate a plurality of lengths to which the pillar can be adjusted by cutting. 
     
     
         93 . The plastic infiltration unit pillar according to  claim 92 , in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length. 
     
     
         94 . The plastic infiltration unit pillar according to  claim 65 , in combination with a foot for insertion into a plastic infiltration unit pillar which has been cut to an adjustable length.