JPH11124885A - Water distributing piping structure provided with water storage function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To costlessly widen an installation position of an emergency water storage tank. SOLUTION: Water distributing pipes under a road are made larger in the diameter to serve as a water storage tank T. Length/diameter of this water storage tank T is made 250 or smaller and the inflow/outflow parts are made to form a conical shape gradually expanded/contracted to prevent water from retaining in the water storage tank T. The water storage tank T and the conical parts are made of pipes a1 , a4 of existing JIS standards. A service pipe Q is provided with a bypass to easily supply water. A water supply pipe E is extended from the low position of the water storage tank T to the edge of a road R to supply water from the water storage tank T without hindrance to traffic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water distribution pipe structure having a water storage tank function, and more particularly to a water distribution pipe structure forming an emergency water storage tank under a road.

[0002]

2. Description of the Related Art Since the Great Hanshin-Awaji Earthquake, the importance of emergency water supply bases has been recognized, and it has been desired to install many emergency water storage tanks. Various types of emergency water storage tanks of this type have conventionally been devised and installed. And so on.

In the conventional emergency water storage tank, a bypass pipe is provided in a park or the like from below a road, which is a normal piping path, and a (length) / (caliber) water storage tank having a length of 10 times or less is provided in the bypass pipe. It is a configuration provided. That is, as shown in FIG. 12, a tank-shaped water storage made of a large-diameter seismic joint ductile cast iron pipe in parallel with a water supply pipe S for water supply and having attached devices such as an air valve b, a water tap d and a fire hydrant c. A tank T is arranged, and the water distribution pipe S and the water storage tank T are connected by an inflow pipe S ′ and an outflow pipe S ′ branched from the water distribution pipe, and an inflow pipe S ′ and an outflow pipe S ′.
In addition, a gate valve (shutoff valve) V is provided between the branch portions of the water distribution pipe S.

In the emergency water storage system, the gate valves V of the inflow pipe S ′ and the outflow pipe S ′ are normally opened, and the gate valve V of the water distribution pipe S is closed, so that the emergency water storage facility is connected via the water storage tank T. Pass water. On the other hand, in an emergency such as an earthquake, the shut-off valves V of the inflow pipe S 'and the outflow pipe S' are closed, so that the water tank T
To prevent outflow of accumulated water and secure emergency drinking water.

[0005] The water storage tank T in this emergency water storage equipment is evaluated for its strength, earthquake resistance, water tightness, durability, design flexibility (selection of capacity according to the installation location, etc.), etc., and has a large diameter having an earthquake resistant joint. Ductile cast iron pipe (for example, caliber: 1
(500 mm, 2000 mm, 2600 mm) are frequently used, and are mainly buried underground in parks and parking lots. These are always clean water without stagnant water (water retention) in the water storage tank T part when passing water. Has been proved in experiments and actual pipelines.

[0006]

As described above, each of the above-mentioned conventional emergency water storage tanks T has a large water storage tank buried in a wide place such as a park or a school playground. However, it is difficult to secure such a large place today, and under the above-mentioned circumstances, it is desired to install more water storage tanks. Is becoming necessary.

In addition, since the water storage tank T is a special product in which many members are specially shaped, it takes time and cost to procure those materials. In addition, since the water storage tank T is installed at a place away from roads, it is required to provide a separate device. Water distribution pipeline S 'and special construction are required.

An object of the present invention is to increase the installation location of an emergency water storage tank at low cost under the above circumstances.

[0009]

In order to solve the above-mentioned problems, the present invention first focuses on the fact that a water pipe (main line) is generally buried under a road. The required length in the water pipe was expanded, and the expanded portion was used as an emergency water storage tank.

As described above, the distribution pipe under the road is inexhaustible as a reservoir, and the distribution pipe is used as a water storage tank.
It is possible to meet the demand for the expansion of the emergency water storage tank. Further, when the water storage tank according to the present invention is constructed in a place where the water pipe improvement work is required, the water tank work also serves as the improvement work. For this reason, the cost of installing a water storage tank can be reduced, for example, by about 30% as compared with the conventional case where a water storage tank is separately installed in a park or the like. Further, since the water storage tank is considered to be a part of the water distribution pipe, the maintenance and management cost is the same as that of a normal water distribution pipe.

In addition, when a water reservoir is formed in a series in the middle of a water distribution pipe composed of small-diameter pipes (for example, 150 mm) buried under the road, making the diameter of the water reservoir extremely large requires installation space. Therefore, it is necessary to keep a medium diameter (for example, 800 mm). However, an emergency water tank must have a certain large volume, and is usually 3 liters / person / day × 10,000 people × 3.
A capacity of 100 m ³ from the day is considered as a guide. Therefore, if an attempt is made to secure a volume of 100 m ^{3 with} a diameter of 800 mm, the total length is 200 m. On the other hand, it is important for such a water storage tank whose primary purpose is to secure drinking water in an emergency, that clean water always flows without water stopping in the water storage tank section.

In consideration of such points, the (required length L) / (piping diameter D) of the water storage tank may be appropriately set based on the road environment of the water storage tank and prevention of stagnant water. For example, when the diameter D is about 800 mm, it is 2 mm from the viewpoint of water retention.
It is preferably about 50 times or less.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an embodiment of the emergency water storage tank, a pipe from a normal diameter water pipe to an inlet of the emergency water storage tank is gradually expanded to guide tap water along its streamline. In addition to the conical shape, the pipe from the outlet of the emergency water storage tank to the normal-diameter water pipe may have a conical shape in which tap water is guided along the streamline and the diameter is gradually reduced.

Since the diameter of the water storage tank is extremely smaller than that of the conventional water storage tank, the water storage tank has a conical entrance / exit structure so that tap water can smoothly flow in and out of the water storage tank without generating water. it can.

In this case, if the emergency water tank and the conical portion of the water inlet and outlet of the emergency water tank and the conical portion of the water pipe are configured by connecting a cast iron pipe of Japanese Industrial Standard, for example, the water tank can be made JIS G If the S-type ductile cast iron pipe specified in 5526 and 5527 and the conical portion are formed of the same KF type dropping pipe, there is no need to use special materials, and the advantage is that the materials can be easily obtained and the construction proceeds smoothly. There is.

[0016] The emergency water storage tank can be branched from a water pipe having a normal diameter at both ends thereof, and can be provided side by side by bypassing a service pipe so that water can always flow through the emergency water storage tank and the service pipe. . This juxtaposition of service pipes is effective when water is required near the water storage tank. Because the water tank is under the road, it is difficult to draw water directly. In addition, the water tank can be inspected and cleaned without stopping water distribution. Furthermore, in an emergency, the water tank and the distribution pipe are separated to secure water in the water tank, and the function of the water distribution pipe can be maintained as long as the distribution pipe is not damaged.

The water supply position from the above-mentioned emergency water storage tank is at a low position, but since the water storage tank is below the road, a water supply pipe is connected to the low position, and the water supply pipe is led to a sidewalk or the like. It is advisable to provide a water supply system at that position. The sidewalk or the like has no effect on road traffic, and water is supplied at that location, so that a water supply environment can be obtained without deteriorating the traffic environment.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS. 1 to 4 and is a main water pipe (caliber: 150) under a road R along a park P. FIG.
mm) Emergency water storage tank T is configured in S. This water storage tank T is an S-shaped straight pipe (diameter: 800 mm, length: 600
0 mm) Connect a _1, a length (pipe length) L: 200 meters in reservoir capacity: was 100 m ^3. The connection is preferably in series, but may be curved in accordance with the laying conditions along a road curve or the like. In addition, it is preferable to provide a downward slope in the water flow direction, and if there is a slope, the inside of the tank can be easily cleaned.

Both ends of the water storage tank T are KF type two receiving T-shaped pipes a ₂
A manhole chamber A is formed in the upper part so as to surround a branch pipe (diameter: 600 mm), and an air valve b, a digestion plug c, and a water tap d are provided in the branch pipe in the manhole chamber A. Manhole chamber A is a frustoconical tube a ₃ provided on the crushed stone B, and those which closes the upper opening in Tetsufuta e. The T-tube a ₂
The water pipe S side is inserted or inserted and dropped (Diameter: 400
mm, Length: 790,775Mm etc.) Connect a _4, has a conical shape pipe gradually reduced in diameter from the diameter gradually increases or caliber 800mm from diameter 150mm to diameter 800mm to 150mm. Due to this conical shape, the tap water from the water pipe S does not flow along the conical wall surface and stays smoothly over the entire cross section of the water storage tank T (the straight pipe a ₁ ). That is, no water retention occurs. In FIG. 1 (b), the axis of the water pipe S and the axis of the water storage tank T are vertically displaced in order to make the burial depth l of both the same.
The above-mentioned pipes a ₁ , a ₂ and a ₄ constitute a water tank part having a total length of 207 m.

From the manhole room A on the low position side of the water storage tank T, as shown in FIG. 1 (a) and FIG. To the sidewalk C, the end of which is a water tap d. The water tap d is provided in the manhole room A provided on the sidewalk C. In addition, the outflow-side conical portion of the water storage tank T has K
F-type drainage T-shaped pipe a ₂ Haidorokan (diameter 100 mm) from the 'It is interposed, the tube a ₂ as shown in FIG. 4' F is ditch D
And guided by the, by opening the gate valve V _1, the mud in the water tank T is (drained) is derived in the gutter D.

An emergency shutoff valve V is installed in the water pipe S at both ends of the water tank T.
When the running water in the water pipe S is weakened or lost due to an earthquake or the like, the valve V is closed to prevent the water from flowing out of the water storage tank T due to the siphon break. The emergency shutoff valve V is also provided in the same manhole room A as described above.

The water shutoff pipes S at both ends of the emergency shutoff valves V, V
Between S, S2 straight pipe (diameter: 75mm, length: 400
Service pipe Q consisting of 0 mm) a ₅ etc. are branched (bypass), the case of obtaining the water supply in the installation area of the water tank T is water via a faucet from the service pipe Q. Water is always passed through the service pipe Q from the water pipe S together with the water storage tank T.

For connection of the pipes a ₁ , a ₂ , a ₄ (general symbol a), various well-known seismic joint structures shown in FIGS. 5 and 6 can be adopted. That is, for example, the lock ring 1 is used to prevent the rubber ring 3 from coming off, and the pressing ring 2 presses the rubber ring 3 to seal the rubber ring 3. In the figure, 4 is a bolt. In this connection, as shown in FIG. 8, a rib 5 can be formed over the entire circumference to reinforce.

Further, as shown in FIG.
It can also be configured in this piece落管a ₄ or 4 or more pieces落管a _4, short, so distilled water does not occur, based on the size of the reservoir T, the existing variety of pieces choose suitable one from落管a _4, and the required taper of (scaled径度). FIG.
As shown in, the conical portion may be fabricated pieces落管a ₄ separately forming a corresponding to the desired reservoir T.

As shown in FIG. 9, both ends of the water storage tank T are closed by plugs so that tap water can flow in and out of the manhole chamber A through a double-hole nozzle t, as shown in FIG. You can also. Its nozzle t is a water pipe S is guided to the branch of the T-shaped pipe a ₂ down vertically downward, together with the bend horizontally branches into the right and left in the tube a ₂ center, which was toward Me vertically inclined is there. For this reason, the flowing water from the nozzle t is split into two directions and is discharged into the water storage tank T, flows as a spiral flow, flows into the nozzle t having the same configuration, and is discharged.

Each of the pipes a ₁ , a ₂ ... Is made of ductile cast iron or the like and has seismic resistance, and the entire water storage tank T is assumed to have seismic resistance.

[0027]

[Experimental Example] In order to check whether or not the structure of the above embodiment can serve as an actual water storage tank T, the capacity of the water storage tank T is set to three types of 100 m ³ , 60 m ³ , and 30 m ³ , To obtain a straight pipe a having a diameter D of 800 mm, the length (pipe length) L in Table 1 is obtained (Experimental Examples 1 to 3). In the conventional tank type, the result is as shown in Comparative Example 1. In this water storage tank T, assuming a daily inflow of 100 m ³ , a one-tenth model was made of transparent acrylic, and the water displacement was examined. At this time, the flow rate was 0.694 l / min.

As shown in FIG. 10, the experimental method is such that a methylene blue solution (colored water) and tap water (colorless water) are piped into a water storage tank (model) T so as to be able to flow through a pump M. Is filled with colored water, colorless water is introduced, water is sampled on the outlet side, and the absorbance of the sample is measured with a colorimeter to determine the degree of change of 99.5% and 99.
The replacement magnification when it became 9% was measured. Table 2 shows the results, and FIG. 11 shows the relationship between the substitution magnification and the absorbance in Experimental Example 1. In addition, replacement ratio = (inflow water amount required for replacement) / (reservoir capacity), and the one-sided type was of the type shown in FIG.

[0029]

[Table 1]

[0030]

[Table 2]

The resulting replacement magnification is 99.9% and 4.0.
Up to 5.5 times, which is within the allowable range of 6 times or less, not much different from tank type, double hole type, single drop (conical shape)
In any of the equations, no water retention phenomenon occurred in the water storage tank T.

[0032]

According to the present invention, as can be understood from the above description, it is possible to construct a water storage tank under a road, and it is possible to sufficiently meet the demand for an increase in emergency water supply bases today at a low cost.

[Brief description of the drawings]

FIG. 1 schematically shows one embodiment, (a) is a plan view,
(B) is a cut front view

FIG. 2 is an enlarged view of a main part of the embodiment.

FIG. 3 is an enlarged sectional side view of a main part of the embodiment.

FIG. 4 is an enlarged cut side view of a main part of the embodiment.

5A and 5B show one embodiment of the pipe joint structure, wherein FIG. 5A is a front view, and FIG.

FIG. 6 shows another example of the pipe joint structure, (a) is a front view,
(B) is a cutaway view of main parts.

FIG. 7 is a front view of another example of the conical portion at the end of the water tank.

FIG. 8 is a front view of another example of the conical portion at the end of the water tank.

FIG. 9 schematically shows another embodiment, in which (a) is a plan view,
(B) is a cut front view

FIG. 10 is a schematic diagram of a water flow experiment.

FIG. 11 is a diagram showing the relationship between absorbance and replacement magnification in a water storage tank.

FIG. 12 is a schematic diagram of a conventional emergency water storage facility.

[Explanation of symbols]

A manhole chamber B Crushed C sidewalks D gutter E lead water pipe (sheet mizuhiki extraction tube) F Haidorokan P park Q service pipe R road (road) S water pipe (water pipe line) T reservoir V, V ₁ valve a ₁ straight Pipe a ₂ T-shaped pipe a ₃ frustoconical pipe a ₄ single droppipe b air valve c fire hydrant d water tap e iron lid 1 lock ring 2 press ring 3 rubber ring 4 bolt

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yusuke Shibata 1-12-19 Kitahorie, Nishi-ku, Osaka City Kurimoto Iron Works Co., Ltd.

Claims (5)

[Claims] 1. A water distribution pipe structure buried under a road, wherein a required length in the water distribution pipe is expanded, and the expanded diameter portion is used as an emergency water storage tank (T). . 2. The emergency water storage tank T is diverged from a water pipe S having a normal diameter at both ends thereof, bypasses the service pipe Q, and is provided side by side. The water distribution pipe structure according to claim 1, wherein the water distribution pipe structure is provided. 3. A water supply outlet pipe E is connected to a low position of the emergency water storage tank T, and the water supply outlet pipe E is guided to a place such as a sidewalk C which does not affect road traffic, and a water supply facility is installed at that position. A water pipe structure characterized by being provided. 4. The emergency water tank T from the water pipe S having the normal diameter.
The pipe to the inlet of the tank has a conical shape that gradually expands the diameter of the tap water and guides the tap water along the streamline, and the pipe from the outlet of the emergency water storage tank T to the water pipe S having a normal diameter is a tap water. The water distribution pipe structure according to any one of claims 1 to 3, characterized in that the water distribution pipe has a conical shape that gradually decreases in diameter to guide the water along the streamline. 5. The emergency water tank T, the emergency water tank inlet / outlet and the conical portion of the water pipe are configured by connecting Japanese industrial standard cast iron pipes a ₁ , a ₂ and a _4. 5. The water distribution pipe structure according to claim 1.