JP2005155298A - Combination type underground reservoir - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination type underground reservoir enabling the suppression of cost for constructing a facility and providing excellent economic effects for an underground type reservoir, and capable of eliminating the possibility of risk on a user when abrupt rain fall comes without obstructing the use of grounds and parks and impairing the value thereof as public fields by water accumulated for each small rain fall for an open type storage facility. <P>SOLUTION: An opening part enabling the overflow of more than inflow amount is formed in the top board part or the upper part of the side wall of the underground reservoir. The opening part is allowed to communicate with a recessed space. A screen for arresting refuse is installed at the opening part formed in the underground reservoir. A water channel bottom lower than the bottom face of the opening part formed in the underground reservoir and a water channel of such a structure that its wall on the recessed side is higher than the bottom face of the opening part is connected to the opening part of the underground reservoir. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  Of the methods for controlling runoff during rainfall, the method of constructing a storage tank underground and the method of storing rainwater in a depression are communicated, and storage from the initial rainfall to the planned rainfall or less is performed in the underground section. Facilities and plans for rainwater outflow control, where storage is carried out in both recessed and underground storage tanks.

Many open storage facilities have been constructed in the past to store underground rainwater storage tanks and depressions.
(1) Underground rainwater storage tanks are designed to introduce rainwater from the development site, etc., discharge the allowable amount from the orifice port in the same way as storage, and store the difference between inflow and outflow. Fully closed structure.
(2) Open-type concave storage uses a construction method that digs a relatively large site, such as a ground or park, below the surroundings, and uses the resulting concave storage space, and terrain where rainwater is likely to concentrate in the valleys, etc. It is a method of building a water storage space by building a dam on the side.

The prior art has the following problems.
(1) In the case of underground storage tanks, construction costs for constructing facilities are high, and a large amount of money is invested in rainfall with a probability of occurrence once in several decades, which is not economically effective.
(2) In the case of an open-type storage facility where depressions are planned, water accumulates in every small-scale rain, which impedes the use of the ground and park, impairs the value of a public square, and sudden rainfall There is concern that users may be at risk in the event of an attack.

The present invention has solved the problem by the following procedure.
(1) From the outflow due to the initial rainfall to the outflow near the planned value, it is stored in the conventional underground reservoir structure to suppress the outflow.
(2) The outflow due to rainfall in the vicinity of the plan starts overflowing from the opening according to the present invention when the water depth in the tank due to the inflow water to the underground storage tank rises, and the water level in the tank does not rise any further.
(3) The inflow water that overflowed from the opening according to the present invention flows into the communicating depression and is stored there.
(4) The drainage of the recessed area after the rain is drained to the underground storage tank through the drainage side groove provided on the outer periphery through the opening provided with the underground reservoir.

The present invention provides the following effects as compared with the prior art.
(1) All spilled water due to small-scale rainfall or early-stage rainfall flows into the underground storage tank, and rainwater does not stay in the concavities that are connected to each other. .
(2) When rain occurs at a scale of about once every several decades, the sum of underground storage tanks and storage in the depressions exerts an outflow control effect as a storage volume, so that an effective and economical outflow control effect is achieved. can get.
(3) Since there are very few machines where rainwater overflowed from underground storage tanks is stored in the depressions, and the residence time is short due to the nature of the rainfall waveform, it does not affect the use of the ground, parks, etc. .
(4) Since the drainage of the ground or park depression is drained to the underground storage tank through the opening provided in the underground storage tank, the drainage function is improved.
(5) Since it is possible to make the diameter larger than the diameter of the discharge orifice port installed in the complete underground storage tank, it is possible to increase the discharge flow rate of the initial inflow pan and reduce the storage capacity. .

  At the top of the underground storage tank or the upper part of the side wall, an opening is provided that allows overflow of more than the inflow. The opening communicates with the recessed space.

  A drainage gutter will be constructed on the outer periphery of the depression, and the rainwater in the depression and the drainage of rainwater that has overflowed from the ground or the water storage tank will immediately flow into the underground storage tank.

  At the opening provided in the underground storage tank, a screen for dust collection is provided.

  A water channel bottom lower than the bottom surface of the opening provided in the underground storage tank and a water channel having a structure in which the wall on the concave side is higher than the bottom surface of the opening are connected to the opening of the underground storage tank.

Overall view of the present invention with an opening in the side wall Overall view of the present invention in which an opening is provided in the top plate

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground storage tank 2 Outflow orifice 3 Side wall part opening 4 Opening part overflow channel 5 Concave 6 Concave outer periphery drainage side ditch 7 Top plate part opening

Claims (2)

  The structure of the underground rainwater storage tank that has an opening on the top or side wall of the underground rainwater storage tank (underground adjustment pond is also agreed), so that rainwater stored inside can overflow from the opening .   The underground rainwater storage tank having the structure of claim 1 and a recess capable of storing temporary rainwater on the ground, a park, a parking lot, or the like communicate with the opening of the structure of claim 1 to improve the rainwater storage effect. How to make it possible.

Images