FIELD OF THE INVENTION
The invention generally relates to storm water retention and detention systems often utilized in urban settings such as Nashville, Tenn., and more particularly to modular pre-cast concrete storm water retention and detention systems.
BACKGROUND
Storm water retention and detention systems are used in urban settings where the cost of land is high, and other systems for diverting and retaining storm water such as ponds, reservoirs, and the like which require land resources are less desirable. These systems are typically made of concrete, and have one or more inlets and outlets to take in water and hold it for a period of time before releasing it back into the environment in a controlled manner to a desired location. This decreases pooling of water around buildings and other structures, and the system can be set up under or adjacent to a building and therefore requires less land resources than traditional ponds and reservoirs.
Storm water retention and detention systems can be custom designed to fit any land use space. However, a number of companies have developed modular systems which enable adaptively setting up a system for virtually any space. Examples of modular systems are found in U.S. Pat. Nos. 6,991,401, 7,160,058, and 7,344,335, each of which are herein incorporated by reference. Alternative modular designs are commercially available from Old Castle Infrastructure. Despite the recent advances in modular storm water retention and detention systems, there is a need for improved and more robust systems which allow for more flexible adaptability to land spaces, easier installation, improved storm and run off water handling, and the like.
SUMMARY
In one aspect of the invention a substantially square module is constructed for use in a storm water retention an detention system which can be configured for use with a plurality of similar modules to adaptively fit into multiple land space configurations.
It is another aspect of the invention to provide a module with more wall space for water containment and detention than currently available modules.
It is yet another aspect of the invention to provide storm water retention and detention systems comprised of a plurality of square modules.
It is still another aspect of the invention to provide storm water retention and detention systems comprised of a plurality of modules with improved air handling features.
It is another aspect of the invention to provide methods for installing storm water retention and detention systems.
According to the invention, a storm water retention or detention system is constructed to fit a desired land area from square shaped concrete modules. Each of the modules has at least one water passage and one air passage, and the water passages and air passages of adjacent concrete modules are in alignment to allow the free flow of water and air therebetween. The water passage may be circular, have a cross-sectional area less than 60% of the total area of a side of module, and be slightly above the bottom inside surface of the modules. The top of only one or the tops of only a few of the modules include ports such as access ports above the surface of the storm water retention or detention system. The external surface, formed from the walls of a plurality of concrete modules, do not include the water passages which allow water flow between adjacent modules, except that one or more of the concrete modules have water inlet ports and one or more different concrete modules include water outlet ports to allow water to flow into and out of the storm water retention and detention system.
DESCRIPTION OF THE DRAWINGS
FIGS. 1A and 1B are side and top views of a concrete module used in a storm retention and detention system where water passage openings are on two adjacent side walls;
FIGS. 2A and 2B are side and top views of a concrete module where water passage openings are on opposite side walls;
FIGS. 3A and 3B are side and top views of a concrete module where water passage openings are on three of the four side walls;
FIGS. 4A and 4B are side and top views of a concrete module where water passage openings are on all four side walls;
FIGS. 5A and 5B are side and top views of a concrete module where a water passage opening is on only one of the four side walls;
FIG. 6A is a top view of a five module storm retention and detention system;
FIG. 6B is a cut away side view of a portion of a storm retention and detention system; and
FIG. 7 is a schematic top view of a fifty eight module storm retention and detention system.
DETAILED DESCRIPTION
With reference to FIGS. 1A and 1B there is shown an example of a concrete module 10 for use in assembling a storm retention or detention system. The thicknesses and heights presented in the drawings are for exemplary purposes and can be varied considerably within the practice of the invention. FIG. 1A shows the module 10 has a bottom floor 12 and a top 14, and FIG. 1B shows the module 10 has four side walls 16, 18, 20, and 22.
The module 10 is a square shape. The square shape allows for a more robust ability to adapt to the shape of a variety of different land areas. Rectangular configurations can put impediments on the final lay out storm retention and detention system, and can be more difficult to align and connect.
FIG. 1A and FIG. 1B show the thickness of the floor 12 and side walls 16, 18, 20, and 22 to be approximately six inches. However, the thickness of the concrete may very depending on the application, with four to ten inches being suitable for most applications. FIG. 1B shows the module being approximately eleven feet on a side, which, given a six inch wall thickness produces a module 10 with an interior ten feet on a side. The length of the side may vary depending on the application, and a square shape ranging from six to fifteen feet on each of the four sides being suitable for most applications. FIG. 1A shows that the bottom 12 is integral with the side walls. This provides for better water handling capabilities; however, in some applications the walls might simply be joined to the bottom and the joints would be sealed with caulk, grout, or other suitable materials. FIG. 1B shows the top 14 resting on the top edges of the side walls. This configuration allows for easy set up and sealing within the modules with the tops being lifted into place with a crane or other device when the storm retention or detention system is assembled. However, in some applications the top 14 may be formed integrally with the side walls 16, 18, 20, and 22, and bottom 12. In FIG. 1A the top is shown as being approximately seven inches thick; however, this thickness may range from four to twelve inches depending on the application. As will be discussed in more detail below, not every module 10 requires an access port (not shown) extending through the top with the inventive storm water retention and detention system.
FIGS. 1A and 1B show two large water passage holes 24 and 26 in side walls 16 and 22 respectively. These passage holes 24 and 26 extend wholly through the side walls and allow water to pass freely between the module and an adjacent module. In a preferred design the water passage holes 24 and 26 are circular in shape and may be, for example, four feet in diameter. Preferably, the opening of the water passage holes 24 and 26 are well less than, for example, 60%, 50%, or even 40%, the total area of the wall in which it is located. For example, in FIGS. 1A and 1B the inside wall as a total area of 50 square feet while the four foot diameter water passage is less than 13 square feet. This extra surface area helps with water containment within each of the modules 10 in a storm retention or detention system and makes the entire assembly stronger. Depending on the application, the shape of the holes need not be circular (e.g., rectangular, triangular, or other polygonal are suitable), however, the circular design provides for more structural stiffness, and makes alignment of adjacent modules 10 easier when assembling the storm retention and detention system from a plurality of modules. In addition, in some applications and/or for some modules, the opening in the side wall for allowing water passage may be greater than 60% of the total area of the wall.
FIGS. 1A and 1B also show six inch diameter air holes 28 and 30 positioned above the water passage openings 26 and 24 respectively. The air holes 28 and 30 need not be circular and could be larger or smaller, and in some applications there could be more than one air hole in a wall. The air holes allow air to be move from one module to another, and eventually out of the storm retention or detention system through a port in a side wall of a module at the side of the system or ports in a top of one of the modules in the system. When water begins to fill up the storm retention or detention system during a heavy storm for example, air present within the system will begin to compress and will need to exit the system as modules fill with water. When the storm retention or detention system is assembled, the air holes 28 and 30 of adjacent modules 10 are aligned in the same manner as the water passage openings 24 and 26.
FIG. 1A also shows the water passage opening 26 is located slight above the top surface of the floor 12 of the module, for example, two inches above. The height above the bottom surface can vary, and in some applications is not required. The slight elevation of the water passage opening 26 can provide some benefits in the manufacturing of the module, as well as structural integrity advantages.
A variety of modules similar to those depicted in FIGS. 1A and 1B are possible. FIGS. 2A and 2B show an example of a concrete module 32 for a storm water retention or detention system which has water passage openings 34 and 36 and air passages 38 and 40 on opposing walls. FIGS. 3A and 3B show an example of a concrete module 42 where three of the walls include water passages 44, 45, and 46, and air passages 48, 49, and 50. FIGS. 4A and 4B show an example of a concrete module 52 where each of the four walls include water passages 54, 55, 56, and 57, and air passages 58, 59, 60, and 61. FIGS. 5A and 5B show an example of a concrete module 62 which has only a water passage 64 and air passage 65 on a single wall. The concrete module may be used around the exterior of the storm water retention or detention system to provide extra storage capacity, and might also be equipped with a rain water inlet or outlet pipe (not shown; discussed below).
FIG. 6A shows storm water retention and detention system 70 comprised of five concrete modules 72, 74, 76, 78, and 80. It can be seen that concrete module 72 has a single water passage 82, like that shown in FIGS. 5A and 5B, which is aligned with water passage 84 of concrete module 74. Concrete module 74 has three water passages 84, 86, and 88, similar to the concrete module depicted in FIGS. 3A and 3B. Concrete modules 76, 78, and 80 are similar to the concrete module depicted in FIGS. 1A and 1B with water passages 90, 92, 94, 96, 98, and 100 on two of the adjacent side walls of the respective module. Each of the water passages 90, 92, 94, 96, and 98 are aligned with a water passage of a neighboring module. When the storm water retention and detention system 70 is constructed, after the modules 72, 74, 76, 78 and 80 are positioned next to one another, caulk, grout or other materials may be applied at the line between the aligned, adjacent water passages to provide for water tightness.
FIG. 6A shows a water inlet port 102 passing through the side wall of concrete module 72, and a water outlet port 104 passing through the side wall of the concrete module 80. The water inlet port 102 and water outlet port 104 may be installed before or after assembly of the storm water retention and detention system 70. The water inlet port 102 and water outlet port 104 may be installed anywhere on the wall (e.g., in the center as in concrete module 72, or toward an edge as in concrete module 80). Preferably, all of the exterior walls of the storm water detention and retention system are solid, without a water passage, except for inlet and outlet ports on some of the exterior walls. This enables storm water to be directed to the storm water retention and detention system 70, and fill up and flow between the modules 72, 74, 76, 78, and 80, before being discharged in a controlled manner and direction by water outlet port 104. FIG. 6A shows that only a few of the modules, e.g., 72 and 80, can include access holes 106 and 108, and this will still allow access to the entire storm water retention or detention system structure. While not shown, the access holes 106 and 108 can provide air venting, and other holes (not shown) may be provided in the tops of some of the modules 72, 74, 76, 78, and 80 for air venting.
FIG. 6B shows a three module 110, 112, and 114, portion of a storm water retention or detention system 116. Notably, the access ports 118 and 120 may include a set of steps or ladder elements 122 or 124 to allow a person to descend inside of the storm water retention or detention structure for servicing, maintenance, etc. FIG. 6B also shows water inlet port 126 and water outlet port 128 located high on the outer walls of concrete modules 110 and 114, above the top level of the water passages 130, 132, and 134 between adjacent modules. The location of the water inlet port 126 and 128 in terms of height above the floor of the storm water retention or detention system 116 can vary depending on the application, and need not be at the same height as shown in FIG. 6B or necessarily well above the top of the water passages 130132, and 134.
FIG. 7 shows that the storm water retention or detention systems 136 can be extremely large and can adapt to the shape of virtually any land space area. For example, FIG. 7 shows a storm water retention or detention system 136 constructed from fifty eight individual concrete modules, where the structure varies from one module wide to four modules wide, and from twenty modules long to nine modules long. FIG. 7, like FIG. 6A, shows that the water inlet 138 and the water outlet 140 need not be in alignment. While not shown, storm water retention or detention systems like that depicted as 136 in FIG. 7 may have more than one water inlet and/or more than one water outlet. In addition, structures, such as a pond outlet (not shown) may be constructed on top of one or more selected modules 142.
While the invention has been described in terms of its preferred embodiments, those of skill in the art will recognize that the invention may be practiced with variation within the scope of the appended claims.
Patent Grant
11639600
