JPH03206823A - Underground water sprinkler for lawn - Google Patents

Abstract

PURPOSE:To enable control over the amount of sprinkled water by providing an underground water sprinkling controller in a water sprinkler for lawn having perforated pipes with closed tips buried in soil and controlling link valves, solenoid opening and closing valves, pressure control valves, etc., according to a change in measured values of lawn environment data and measured values of hydraulic pressure. CONSTITUTION:Perforated pipes 50 having many holes 52 on the pipe wall and closed tips are buried in soil 22 under lawn 20 and water from a water feed pipe (branch pipe) 37 is controlled through a pressure control valve 47 connected to an underground water sprinkling controller. The underground water sprinkling controller controls the pressure control valve 47 according to a change in signals from measuring instrument for data related to lawn growth, e.g. a soil thermometer, soil moisture meter, pH meter, soil resistance meter, colorimeter, chlorophyll meter, radiation thermometer, actinometer, thermometer, hygrometer, rain gauge or wind vane and anemometer.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an underground watering system for lawns, and more particularly to an underground watering system for lawns that allows control of the amount of water sprinkled from a perforated pipe buried underground.

[Conventional technology]

The present applicant disclosed a lawn growing environment control device in Japanese Patent Application No. 1-177053. This apparatus will be briefly described with reference to FIG. 1 to the extent necessary for explaining the invention. The specifications of the growth environment of the lawn 20, that is, the physical quantities, chemical quantities, and other changing quantities of the atmosphere, soil, grass, etc., are measured using an appropriate measuring device. For example, a soil thermometer 1, a soil moisture meter 2, a hydrogen ion concentration pH meter 3, a soil resistance meter 4, etc. are used to measure the soil condition, and a colorimeter 6, a chlorophyll meter is used to measure the condition of the lawn. 7. A pyranometer 9, a thermometer 10, a hygrometer 11. to measure atmospheric and weather conditions using a radiation thermometer 8, etc. A rain gauge 12, a wind direction and speed gauge 13, etc. are used. These measuring instruments generate measured value signals and transmit them to a water sprinkler control device (corresponding to underground water sprinkler control device 25 in FIG. 1). Watering the lawn 20 is described in the above patent application No. 1-177053.
In this case, water is supplied from the sprinkler pump 29 to the sprinkler 38 (FIG. 4) via the flow meter 30. Watering control device (underground watering control device 25 in Figure 1)
) performs water sprinkling control by controlling the water sprinkling pump 29 via the controller 28 in response to changes in the environment represented by the measured value signal.

[Problem to be solved by the invention]

Sprinklers first spray water into the air, so some of the water evaporates before reaching the grass leaves, and the remaining water after evaporation and absorption on the leaf surface reaches the grass roots. That is, sprinklers do not directly supply water to the roots of the grass, and it is difficult to accurately control the amount of water supplied to the roots of the grass by controlling the amount of water sprayed by the sprinklers. A known method for directly supplying water to the roots of grass is to use a perforated pipe 50 as shown in FIG. The perforated pipe 50 has a large number of holes 52 bored in the pipe wall, and water is supplied from one end of the pipe, and the tip is closed. When water is supplied from the water pipe 32 to the perforated pipe 50, the water flows out from the hole 52 of the perforated pipe 50 into the soil 22 and reaches the roots of the grass. However, if water is simply sent to the perforated pipe 50, the amount of water flowing from the perforated pipe 50 to the soil 22 varies depending on various conditions, such as the degree of close contact between the pipe surface and the soil, the water content of the soil, and the like. For this reason, accurate control of the amount of underground water sprinkling has not been implemented in the past. In addition, conventional underground watering systems for lawns have a simple water supply network, and are equipped to the extent that some water supply pipes can be selectively and manually shut off in the event of an emergency such as a pipe being damaged. This is insufficient for detailed water supply control, such as increasing the amount of water supplied to areas that require a large amount of water, or adjusting water pressure according to the amount of water supplied. It was not possible to control underground watering. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an underground watering device for lawns in which the amount of watering can be adjusted.

[Means to solve the problem]

Referring to the embodiment shown in FIG. 1, the underground watering device for lawns according to the present invention includes a perforated pipe 50 with a closed end buried in the soil 22 (FIG. 2) under the lawn 20, and a perforated pipe 50 with a closed end. A large number of holes 52 bored in the wall of the pipe 50, a water supply pipe 37 connected to the unblocked end of the perforated pipe 50 via a pressure control valve 47, and the specifications of the lawn growing environment are measured and a specification measurement value signal is sent. Measuring device 1-
13, and an underground water sprinkling control device 25 connected to the specification measuring device and the pressure control valve. The underground watering control device 25 controls the perforated pipe 50 via the pressure control valve 47 in response to changes in the specifications of the lawn growing environment.
control water supply to Preferably, different parts of the lawn 20 (e.g. 2 in FIG.
A plurality of main branch pipes 36 (e.g., 36a to 36g in FIG. 2) are installed in the main branch pipes 36 (for example, 36a to 36g in FIG. 2) installed in the main branch pipes 36 (36a to 36g in FIG. A pressure gauge 40 that generates a water pressure measurement signal in the branch pipe.
, a perforated pipe 50 with a closed end connected to each main branch pipe 36 via a pressure control valve 47, a large number of holes 52 bored in the wall of the perforated pipe 5o, and a hole between adjacent main branch pipes 36. The pressure gauge 40 via a connected interconnection valve 45 and a signal line 49,
A configuration including an underground water sprinkling control device 25 connected to the electromagnetic on-off valve 41, the interconnection valve 45, and the pressure control valve 47 is used. During operation, the underground watering control device 2
5 applies output signals to the corresponding valves 41, 45, 47 for selectively controlling the valves 41, 45, 47 in response to changes in the dimension measurement value signal and the water pressure measurement value signal. More preferably, a water-blocking membrane 55 (FIG. 4) is buried in the soil 22 where the lawn 20 grows, and the perforated pipe 5o is connected to the lawn 20.
0 and the water-shielding membrane 55 in the soil 22.

[Effect]

First, it will be explained that the water pressure of each main branch pipe 36 can be controlled. In the embodiment of FIG. 3, for example, the main branch pipe 3
6f receives water supply through interconnection valves 45c, 45d, and 451.45j. When interconnection valve 45i is closed, underground watering control device 25 receives water supply through interconnection valves 45c, 45d, and 451.45j. (not shown) detects the lack of water pressure in the main branch pipe 36f and activates the electromagnetic on-off valve 41 and interconnection valves 45c and 45d.
, 451, and 45j cannot resolve the water pressure shortage, the water pressure can be controlled by opening the interconnection valve 45i and supplying water from both ends of the main branch pipe 36f to eliminate the water pressure shortage. If the water pressure in the main branch pipe 36 can be maintained at the required level,
The amount of water supplied to each perforated pipe 50 can be controlled by adjusting the opening degree of the pressure control valve 47 from the underground watering control device 25. By adjusting the amount of water supplied from the perforated pipe 50 to an appropriate level, the amount of water in the soil 22 can be quickly and appropriately controlled. By providing the water-blocking membrane 55, the underground water level shown in FIG. 4 can be maintained at an appropriate level. In this way, the objective of the present invention is to provide an underground watering device for lawns in which the amount of watering can be adjusted.

【Example】

The embodiment shown in FIG. 3 has seven grass areas 20a to 20g, such as a grass surface consisting of a fairway and a green of a golf course.
An example of equipment is shown in which seven main branch pipes 36a to 36g are provided. Although it has been explained above that the water pressure of each main branch pipe 36a-36g in this embodiment can be adjusted, partial shut-off in the prior art is also possible by selectively opening and closing interconnection valves 45a-45m. The underground water sprinkling control device 25 can be constituted by a computer having an appropriate storage capacity and control program. An example of the operation of the underground water sprinkling control device 25 will be described with reference to the flowchart in FIG. First, in step a, target values for the specifications of the lawn growing environment are set in the computer memory. The types of target values to be set are the above measuring instruments 1-4 and 6-13.
corresponds to the type of In step b, the allowable deviation ΔAi between the management target value and the actual measurement value is input as a constant used for control, and is written into the memory of the computer. Next, step cSd. and e, input the measured values of the soil-related specifications, the atmospheric-related specifications, and the turf-related specifications, respectively. In step f, the underground watering control device 25 calculates the deviation ΔNi between each dimension measurement value and the management target value. In step g, it is determined whether the deviation ΔNi of each of the measured values of the specifications from the management target value exceeds the allowable deviation ΔAi. If the deviation is less than the allowable deviation ΔAi, the measurement and deviation calculation are repeated through step n or steps n and p. In step n, it is determined whether or not it is necessary to change the allowable deviation ΔAi, and in step p, it is determined whether or not interruption is necessary. If the allowable deviation ΔAi is exceeded, the control proceeds to step h to determine whether to perform watering. For example, if the measured value of soil moisture content deviates from its management target value by more than an allowable deviation and other environmental parameters do not prohibit underground watering,
Make a decision to sprinkle water. In addition, when water supply is restricted due to abnormal drought, etc., watering is not decided based solely on the specifications of the natural environment, and a decision not to water is made based on external conditions. If it is determined in step h that watering is not to be performed, the process returns to step C and the measurement and deviation calculation are repeated. When it is determined that watering is to be performed, in step i, the underground watering control device z5 calculates the optimal watering range and watering amount for alleviating the detected soil moisture deviation. Further, in step j, a valve control signal corresponding to the watering range and watering amount is sent to the watering pump 29, the electromagnetic on-off valve 41, the interconnection valve 45, and the pressure control valve 47, thereby controlling the watering range and the watering amount in step j. Add watering to soil 22 according to the following. At the same time, as shown in step m, the water sprinkling position, water sprinkling amount, water sprinkling pressure, etc. are taken into the underground water sprinkling control device 25, and the information is displayed and/or recorded as necessary. The above-mentioned optimal watering range and watering amount have conventionally been determined by relying on the many years of experience of managers. According to the present invention, the underground watering control device 25 automatically performs the above operations rationally and in a short time using a method that comprehensively considers the experienced knowledge of experts and measured values of other specifications as necessary. The optimal watering range and amount can be determined. Further, the underground watering control device 25 accurately performs watering in the above-mentioned optimum watering range and watering amount under feedback control of the measured values of the measuring devices 1-4 and 6-13 to maintain soil moisture at a required target value. That is, automatic control of soil moisture with high reliability is realized.

【Effect of the invention】

As explained in detail above, the underground watering device for lawns of the present invention controls underground watering while feeding back the P1 constant value of the lawn growing environment and the measured value of water pressure at the inlet side of the perforated pipe. Therefore, it has a remarkable effect of reliably controlling the amount of water sprinkled underground.

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram showing the configuration, Fig. 2 is an explanatory diagram of water sprinkling using perforated pipes, Fig. 3 is an explanatory diagram of the arrangement of various control valves in piping, Fig. 4 is an explanatory diagram of the water-blocking membrane, FIG. 5 is a control flow chart. Cable J1, 8... Radiation thermometer, 9... Solar radiation, 1
0... Thermometer, 11... Hygrometer, 12... Rain gauge, 13... Wind direction and speed meter, 20... Lawn,
22...Soil, 25...Underground watering control device, 2
8... Controller, 29... Water pump, 30
...Flow rate meter, 35...Water supply pipe, 36...Main branch pipe, 37...Water pipe, 38...Sprinkler-40...Pressure gauge, 41...Solenoid on-off valve, 42
...Solenoid, 45...Connection valve, 47...
Pressure control valve, 49... Signal line, 50... Perforated pipe, 52... Hole, 55... Water-shielding membrane.

Claims (3)

[Claims] (1) A perforated pipe with a closed end buried in the soil under the lawn;
A large number of holes drilled in the wall of the perforated pipe, a water supply pipe connected to the unblocked end of the perforated pipe via a pressure control valve, and specifications of the lawn growing environment are measured and a specification measurement value signal is generated. a measuring device that generates water, and an underground water sprinkling control device connected to the specification measuring device and the pressure control valve; An underground watering device for lawns that controls water supply to the perforated pipe. (2) A plurality of main branch pipes buried in the soil in different parts of the lawn and connected to the water supply pipe via electromagnetic shut-off valves, and a main branch pipe attached to each of the main branch pipes to generate a water pressure measurement value signal of the main branch pipe. A pressure gauge, a perforated pipe with a closed end connected to each of the main branch pipes via a pressure control valve and buried in the soil of the lawn area corresponding to the main branch pipe, and a hole bored in the wall of the perforated pipe. A large number of hanging holes, a interconnection valve connected between adjacent main branch pipes, and a ground connected to the pressure gauge, the pressure control valve, the electromagnetic on-off valve, and the interconnection valve via a signal line. What is claimed is: 1. An underground watering system for lawns, comprising: an underground watering control device; (3) In the underground watering device for lawns according to claim 1 or 2, an impermeable membrane is buried in the soil where the lawn grows, and the perforated pipe is connected to the soil between the lawn and the impermeable membrane. An underground watering device for lawns that is placed inside.