Street drain with side catch basin

Abstract

Street drain with lateral catch basin, characterized in that two upwardly open chambers are separated by a partition wall, one chamber being closed by a drain grate of the street drain, the other by a manhole cover, wherein a removable housing is inserted into the chamber below the drain grate, wherein the catch basin is inserted into the chamber under the manhole cover, wherein a slurry separator, which is a semi-circular perforated sheet metal channel, is suspended below the drain grate at an angle of approximately 20° towards the lateral catch basin on the housing and rests in an opening on the sloping partition wall, so that the solids contained in the rainwater are discharged from the watercourse into a catch basin via the sloping slurry separator.

Description

[0001] Most street drains have a catch basin suspended beneath the grate, into which solids such as leaves, paper, cigarette butts, gravel, etc., are washed by rainwater. A full catch basin obstructs the flow of water, even if the sewer system still has capacity. When the sewer system is full, wastewater from lower-lying street drains can be forced onto the street surface.

[0002] The aim of the invention is to find a street drain that separates solids from the rainwater without obstructing the water flow, indicates the fill level of the catch basin and has a securely closable backflow preventer.

[0003] The problem is solved according to the invention by diverting the solids from the watercourse into a lateral catch basin with level indicator by means of an inclinedly arranged sluice separator and by means of a mechanically closed backflow preventer to prevent the backflow water from rising from the sewer.

[0004] The street drain can be a cube-shaped prefabricated element, e.g., made of concrete or plastic. It is closed on three sides and has two upward-facing chambers separated by a partition. This partition has an opening for the backflow preventer and a smaller one for the drainage of runoff water below the catch basin. The runoff water is directed into the housing by a rubber lip located above the intermediate floor of the housing.

[0005] The upper edge of the precast element is reinforced to absorb the shear load from the drain grate or manhole cover. A height- and slope-adjustable support for the drain grate or manhole cover is recessed towards the lower end to the depth of the precast element's edge reinforcement. Height-adjustment supports, for example between the drain grate and the precast element, are installed with insulation as usual.

[0006] One chamber is closed by the grate of the street drain, the other by a manhole cover. The chamber beneath the grate has a funnel-shaped intermediate floor with a flush-mounted socket for connection to the sewer line.

[0007] A removable housing, containing the factory-installed drainage components, can be inserted into the chamber beneath the drain grate. This housing, enclosed on three sides, is made of sheet metal or plastic and is shaped to fit the chamber of the prefabricated component. It also features an intermediate shelf.

[0008] The housing wall, which connects to the intermediate wall of the precast element, has an opening for the sluice box and a smaller one for the drainage of drip water from the catch basin. During installation, the housing's drain pipe is inserted into the socket of the sewer line at the intermediate floor of the precast element. A trap may be located below the intermediate floor of the precast element.

[0009] The catch basin is located in the second chamber. It can be emptied via a separate access cover located to the side of the drain grate. The dimensions of the catch basin correspond to those of the cover. For ease of emptying, the catch basin is positioned on the sidewalk side of the street drain. The access cover can be opened, and the catch basin can be pulled out for emptying without being obstructed by parked cars.

[0010] Solids washed in with rainwater, such as leaves, are separated by a sluice box. This sluice box can be, for example, a semicircular perforated metal trough, which is suspended below the drain grate at an angle of approximately 20° towards the side catch basin and rests in an opening on the angled partition wall. The trough ends just before the wall of the catch basin. Several troughs can be arranged side by side across the width of the grate, with adjacent sides of two troughs each covered by a U-profile. The holes in the metal trough have a diameter of approximately 2 mm to separate even small solids such as cigarette butts or bottle caps. The total area of ​​the holes should exceed the total inlet area of ​​the drain grate.The solids are collected by the channel and washed into the laterally positioned catch basin by the incoming rainwater, which then drains downwards through the holes along the channel. The end of the perforated metal channel is extended by a flexible rubber lip so that it protrudes over the wall of the catch basin. Its flexibility ensures that it does not impede the emptying of the catch basin.

[0011] Below the scour separator, an intermediate floor of the housing collects the rainwater in a funnel shape, and it flows away with the dripping water below the catch basin through a funnel neck that is offset from the center to the edge.

[0012] At the end of the funnel neck, a backflow preventer is installed, for example, an internal backflow valve that rotates around a horizontal central axis and has a stop with a seal in both the upper and lower halves of the pipe. During rain, the backflow valve opens due to the pressure of the rainwater.

[0013] A potential backup of sewage can force rainwater back up and flow onto the street surface through the open backflow preventer. This is mechanically prevented by a movable rocker arm installed below the backflow preventer in the sewer pipe, with its pivot point located in the pipe wall. The rocker arm is held downwards by its own weight, a position that can be further supported by a steel spring on the outside of the pipe. It is advantageously curved upwards at the end, resembling a spoon, so that its own weight presses it downwards and the pressure of the backflowing water pushes it upwards.

[0014] The rocker arm outside the pipe wall is movably connected to a guided linkage. The other end of the linkage has, for example, a rack and pinion. The axle of the internal backflow preventer protrudes from the sewer pipe on one side and has, for example, a toothed ring.

[0015] When the rocker arm is lowered, the rack protrudes beyond the toothed ring inside the sewer pipe. As the linkage is retracted, the teeth of the rack engage with the toothed ring, rotating the ring and thus the axis of the backflow preventer.

[0016] As the water level rises and the pressure of the backflow water pushes the rocker arm inside the sewer pipe upwards, while the rocker arm outside the sewer pipe is pushed downwards past its tipping point. This movement, via the linkage and rack, rotates the toothed ring and axle, mechanically closing the backflow preventer. When the backflow water drains away and the accumulated rainwater flows in, the rocker arm inside the pipe is pushed downwards, opening the backflow preventer.

[0017] It is advantageous for the fill level of the gully to be displayed mechanically or electronically. With a mechanical display, for example, the gully lowers under its own weight against a spring force as the fill level increases, and the fill level is then visible on a scale.

[0018] Electronic ultrasonic level measurement is a suitable option. The ultrasonic sensor is positioned under the cover of the catch basin. Commercially available ultrasonic level sensors offer various outputs for different displays. The display can be, for example, a colored LED light (green, yellow, red). Remote monitoring of individual level readings is also possible.

[0019] The dripping water from the sump runs across the sloping base, through an opening in the partition wall and the housing wall, onto the intermediate floor of the housing in the other chamber. The gap between the partition wall and the housing wall is bridged by a flexible rubber lip, which can be bent upwards and downwards into a recess in the partition wall when the housing is inserted and removed. The wall of the partition wall is recessed above and below the rubber lip to allow for its movement during insertion and removal.

[0020] A perforated metal sheet is arranged in front of the opening of the partition wall on the side of the gully to retain solids that have fallen next to the gully.

[0021] The drain outlet of the prefabricated element for connection to the sewer system is located laterally below the intermediate floor, adjacent to the odor trap.

[0022] The advantage to be achieved with the invention lies in increasing the efficiency of the water drainage during heavy rain, providing information about the fill level of the catch basin, and providing a mechanically secure backflow preventer.

Claims

[1] Street drain with side catch basin, characterized by that two upwardly open chambers are separated by a partition wall, one chamber being closed by a drain grate of the street drain, the other by a manhole cover, wherein a removable housing is inserted into the chamber below the drain grate, wherein the catch basin is inserted into the chamber under the manhole cover, wherein a slurry separator, which is a semi-circular perforated sheet metal channel, is suspended below the drain grate at an angle of approximately 20° towards the lateral catch basin on the housing and rests in an opening on the sloping partition wall, so that the solids contained in the rainwater are discharged from the watercourse into a catch basin via the sloping slurry separator. [2] Street drain with side catch basin according to claim 1, characterized bythat a movable rubber lip is arranged at the end of the flush separator. [3] Street drain with lateral catch basin according to claim 1-2, characterized by , that the fill level of the gully is displayed. [4] Street drain with lateral catch basin according to claims 1-3, characterized by , that solids in the dripping water next to the gully are retained by the partition wall before they can drain away. [5] Street drain with lateral catch basin according to claims 1-4, characterized by that the catch basin can be removed from under a manhole cover to the side of the street drain. [6] Street drain with lateral catch basin according to claims 1-5, characterized by that devices for water drainage may be incorporated into a housing. [7] Street drain with side catch basin according to claim 6, characterized by that the catch basin is located to the side of the watercourse. [8] Street drain with lateral catch basin according to claims 1-7, characterized by that a backflow preventer is installed in the drainpipe of the street drain. [9] Street drain with side catch basin according to claim 8, characterized by , that a backflow below the backflow valve can trigger the closing of the backflow valve via a mechanism. [10] Street drain with side catch basin according to claims 8-9, characterized by that a trap is installed in the drainpipe.