JPS6346806B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underground drainage system suitable for removing groundwater existing in a portion adjacent to an underground structure.

More particularly, the present invention relates to an improved underground drainage system formed by a drainage pipe, a plate-shaped water channel-forming core sheet, and a cover of filter material surrounding the core sheet.

The object of the invention is to provide a textured core sheet of plastic in contact with the drain pipes and an interconnected cover enclosing this core sheet, the core sheets being fixed in the cover and connecting the drain pipes adjacent to each other. To obtain an improved drainage device which can be inserted into a cover and form a continuous drainage passage of a desired length.

Underground, it is necessary to remove groundwater from around underground structures. The improved drainage device of the present invention consists of an assembled cover and a core sheet inserted into the cover, and the covers are integrally connected to each other and formed by these covers. A perforated drainage pipe extends parallel to the lower edge in the longitudinal direction.

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 10 indicates an elongated drainage pipe, and this drainage pipe 10 has an opening 10a provided in its side wall along the longitudinal direction of the drainage pipe 10 so as to communicate with the inside of the drainage pipe 10 in order to carry out groundwater. W shown in Fig. 3 indicates the foundation wall protruding from the hole E,
The drainage pipe 10 is arranged in the hole E with a slight inclination to the horizontal so that the groundwater inside the drainage pipe 10 can be drained. In the present invention, a mechanism is provided to surround the drain pipe 10 in order to prevent the aperture 10a of the drain pipe from being clogged with earth and sand on the drain pipe in the conventional drainage device.

In the present invention, as shown in FIG. 3, a plurality of rectangular plastic core sheets 12 having a plurality of irregularities are arranged at intervals in the longitudinal direction of the drain pipe 10, as shown in FIG. Each core sheet 12 is formed of a water-impermeable sheet having a certain thickness, and as shown in cross section in FIG. 12a is formed on the other side. With this structure, a large number of horizontal and diagonal fluid passages are formed.

What is important in the present invention is that the opposing protrusions 12
b and depressions 12a are formed on opposite sides of the core sheet 12. Preferably, the depth of the protrusion or depression is on the order of 6.3 mm (1/4 inch). The core sheet 12 has a constant thickness on the order of 18 to 30 mils and is formed from polystyrene plastic for sufficient rigidity. These core sheets 1
2 and 12 are arranged adjacent to the outer peripheral surface of the drain pipe 10, preferably in contact with the drain pipe.
The sheets 12, 12 are retained by liquid permeable longitudinally extending non-woven covers 14, 14.

The cover 14 is formed by folding a sheet material along a line 14a, and its front surface F1 and rear surface F2 are sewn together at seams 14c, 14d, and 14e, respectively. The bottom edge of each cover 14 extending in the longitudinal direction is sewn together at a portion indicated by a seam 14e. Further, the left and right edges of the cover 14 are sewn together at the seams 14c and 14d to form a portion surrounding the core sheet 12. Furthermore, a space for inserting the drain pipe 10 is formed within the cover 14.

The right vertical edge of the cover 14 is formed with a flap portion, thereby allowing the cover 14 to
so that the vertical edges can be pinched. That is, seam 14
d defines the limit of penetration of the received left side portions of adjacent covers 14 so that adjacent covers 14 partially overlap as shown in FIG. The cover 14 is made of a synthetic resin which constitutes a filter through which water can easily pass.
Water flowing downward between the irregularities of the core sheet 12 flows into the drain pipe 10 through the openings due to hydrostatic pressure, and groundwater is drained through the drain pipe 10 as is known in the art.

When the hole E is filled with mud as the groundwater drains, the front surface F1 of the water permeable cover moves downward and comes into close contact with the drain pipe 10 and the core sheet 12.

[Brief explanation of the drawing]

FIG. 1 is an explanatory front view of the apparatus of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a sectional view taken along line 3-3 in FIG. 10... Drain pipe, 10a... Hole, E...
Hole, W...foundation wall, 14...cover, F1...front, F2...rear, 12...core sheet.

Claims (1)

[Scope of Claims] 1. A rigid drainage pipe having a side wall opening for passing groundwater and a passage for the groundwater to pass therein, and an axis of the drainage pipe provided in contact with the drainage pipe. a plurality of groundwater-impermeable rectangular textured plastic core sheets having longitudinal upper and lower edges parallel to , and a cloth-like liquid-permeable cover covering the drainage pipe and the core sheet; The cover is made of a plurality of synthetic nonwoven fabrics each having two rectangular surfaces covering both sides of the core sheet, and the two rectangular surfaces are joined together at upper and lower longitudinal edges so as to sandwich the core sheet therebetween. and the two rectangular surfaces have portions adjacent to interconnected vertically extending edges forming an opening for the drainage pipe, the drainage pipe extending between adjacent covers. , wherein the core sheet is fixed between the rectangular surfaces of the cover, but the drainage pipe is not fixed. 2. The underground drainage system according to claim 1, wherein the cover has a flap portion on one side into which an edge of an adjacent cover is inserted.