JPS6228248B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Objective) The present invention relates to a rainwater treatment method in which rainwater flowing into a ditch on a paved land is allowed to permeate into the ground at a rainy place without being discharged into a river or the like.

Rainwater treatment on paved land is generally performed by discharging it into rivers, lakes, reservoirs, etc. through ditches, but rivers and lakes are often located far away, and reservoirs have the advantage of being located nearby. On the other hand, there is a strong tendency to dislike installing them due to management issues from safety, hygiene, and other standpoints. In the case of remote processing, there is a risk of flood damage due to rising water levels in rivers, etc., as well as many other human-made disasters such as urban desertification due to drying out of paved areas and nearby areas, ground subsidence due to decreased groundwater, and poor harvests due to back infiltration of seawater. I am doing it. The purpose of the present invention is to eliminate the deficiencies of conventional ditch drainage, and to obtain a simple civil engineering method that uses the ditch system and allows rainwater to permeate into the ground at rainfall locations, preventing soil drying and recharging groundwater. .

(Structure) Next, the structure of an embodiment of the present invention will be described based on the drawings. Rainwater treatment on large paved areas such as building and factory sites, housing complex premises, parking lots, roads, etc. can only be done using side gutters, and the present invention is also based on digging out side gutters. The basic structure is to allow rainwater received inside the building to diffuse and infiltrate into the ground. First, an earthen ditch 1 with a width of 170 to 180 cm and a depth of 70 to 80 cm is prepared on the ground surface based on the shape of the water receiving structure described below.
Dig and fill the bottom of the trench with concrete, etc., and use this as the bottom plate 2. Both sides of the bottom plate are made to rise briefly, and the outer surface of the rising edge is in contact with the earthen wall 1', but the inner surface is an inwardly sloped surface. A side wall 3' constituting a water receiving groove 3 is constructed on the bottom board at a distance of 50 to 55 cm from the earthen wall, and water holes 4 are provided at regular intervals at the lower end. The internal width of the water receiving groove 3 may be about 40 cm, the height is up to the ground surface, and an overflow pipe 5 consisting of a vertical pipe and a horizontal pipe branching from this is connected to the upper part. The vertical pipe opens into the pearlite layer described later, and the horizontal pipe is buried shallowly on the ground surface and opens into an existing drainage ditch. It is efficient to install overflow pipes on both sides of the water receiving gutter, but depending on the topography, they may be installed on one side, and the direction of the horizontal pipe can be freely bent along the way. Once the water receiving groove 3 has been installed, a water absorbing material 6 such as coal ash is layered on the slope of the bottom plate 2 to a thickness of about 10 cm, and then it is placed in the gap between the side wall 3' of the water receiving groove and the soil wall 1'. Sintered particles of obsidian powder (hereinafter referred to as perlite) 7 are filled to a height of about 30 cm from the bottom of the gutter, and the remaining voids are backfilled with soil 8 until it reaches the ground surface.

(Effects) Rain that falls on the paved ground where the gutter according to the present invention has been constructed flows down the paved surface and enters the water receiving groove 3, and passes through the water receiving groove through a plurality of water holes 4 provided at the lower end of the groove wall 3'. Penetrates into the pearlite layer discharged on both sides. Most of the infiltrated water flows sideways due to the capillarity of the pearlite layer and its own weight, reaches the earth wall 1', infiltrates into the soil pot, and becomes groundwater. The water that has risen through the pearlite layer is absorbed by the soil above, and the water that remains at the bottom of the trench is absorbed by the water absorbing material 6, such as coal ash, and joins the lateral flow.

According to the results of the experiment described in the specification of patent application (1) (title of invention: groundwater recharge method) submitted by the same applicant on the same date, it is extremely rare for rainwater to overflow from the water receiving ditch. Since temporary overflow may occur when the paved area is vast or during heavy rain, in the present invention, an auxiliary overflow pipe 5 is provided as described in the configuration section. When too much water intrudes into the pearlite layer 7 and cannot be absorbed by the surrounding soil, the overflow water rises up the vertical pipe of the overflow pipe 5, reaches the horizontal pipe, flows inside the horizontal pipe, and drains into the existing ditch or retarding pond. etc. However, even overflow water should be allowed to penetrate underground as much as possible, so in this example, the horizontal pipe and extension pipe are tied together to allow water to leak at each joint, and into the soil under the pipe. A method of gradually reducing overflow water by forming a pearlite water absorption layer 9 was added. As a result of the construction of the present invention, most of the rain that falls on the paved land permeates into the ground, providing moisture to the paved land and soil in the vicinity, and further permeates into the underground to recharge groundwater, resulting in Disasters caused by dry land and lack of groundwater can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a workpiece constructed according to the present invention, and FIG. 2 is a plan view of the same. 1 is a soil trench, 1' is a wall of the soil trench, 2 is a bottom plate, 3 is a water receiving trench, 3' is a side wall that constitutes a water receiving trench, 4 is a water inlet, 5 is an overflow pipe, 6 is coal ash, etc. 7 is a perlite grain, 8 is soil, 9 is a perlite water absorption layer under the overflow pipe, and the arrow is the direction of water movement.

Claims (1)

[Claims] 1. A long soil trench excavated from the ground surface is filled with a bottom plate with both sides rising up and sloping inward. It is constructed on a bottom plate with a required gap between it and the groove, and after layering a water-absorbing material on the slope of the bottom plate, the above-mentioned gap is filled with pearlite grains to a certain height, and the upper part of the water receiving groove is Overflow pipes consisting of vertical pipes and horizontal pipes branching from the vertical pipes are connected at regular intervals, the vertical pipes are opened into the pearlite layer, and the horizontal pipes are buried below the ground surface and open to other ditches, etc., A groundwater recharge method characterized by backfilling the entire area except the water receiving trench with soil.