JP7786706B2 - Emergency water tank intake device - Google Patents

Description

This invention relates to an emergency water tank installed midway through a water pipe or other piping for supplying fresh water, and in particular to the structure of a water intake device installed to draw water from the tank in an emergency.

Emergency water tanks are typically horizontally or vertically cylindrical and are installed underground. They are connected to inlet and outlet pipes for supplying fresh water during normal use, and are also equipped with a water intake device for removing water from the tank in an emergency.

Water intake devices for horizontally placed cylindrical emergency water tanks are shown in Patent Documents 1 and 2, among others. Figure 5 shows an example of a conventional water intake device. A manhole cylinder 11, which serves as an entrance and exit for workers during maintenance and inspection of the interior of the water tank, is integrally provided on the top of the water tank body 1, and a sealing lid 12 is fixed with bolts to the body flange 15 at the top end of the manhole cylinder 11.

The upper part of the sealing cover 12 is a space surrounded by a cylindrical iron manhole frame 35, shown by imaginary lines, and an iron cover 36 that is flush with the ground surface GL and closes the upper opening. This space houses the valves and fittings of the water intake device. In Figure 5, two water intake pipes 21 are provided: one for water supply to draw stored water and one for fire extinguishing.

The water intake pipe 21 is welded (fixed by welding) to the sealing lid 12, and an upper flange 22 is welded to its upper end. The water intake pipe 21 is long enough that its lower end opens into the bottom of the water tank body 1, preferably a water collection pit located at the bottom, when the sealing lid 12 is closed. The upper flange 22 is connected to one-touch pipe fittings 27, 28, which connect to a water supply pump that draws stored water or a fire hose, via a repair valve 24 and short pipes 25, 26 for connecting equipment.

There are various types of pipe fittings, but typically the same type is used for each type of equipment. Most water supply pipe fittings (fittings for water supply pumps) are camlock fittings, while fire service pipe fittings (fittings for fire hoses) are Machino fittings. Therefore, a male fitting 27 of the camlock fitting and a male fitting 28 of the Machino fitting are attached to the water tank side. In the illustration, the male fitting 28 of the Machino fitting is connected via a female fitting 38 with a fire service screw for a flange connection, and caps 31 and 32 are attached to these fittings 27 and 28.

In the example shown in Figure 5, separate intake pipes 21 are provided for water supply and firefighting. However, in small water tanks and the like, structures with only one intake pipe are also in practical use. In such cases, the pipe fitting is a firefighting pipe fitting 28, and this is achieved by attaching a firefighting pipe fitting (usually a female Machino-type fitting) to the suction pipe of the water supply pump that draws water from the water tank.

Japanese Patent Application Laid-Open No. 2000-129735 Japanese Patent Application Publication No. 10-292445 Utility Model Registration No. 3181093

As shown in Figure 5, the conventional water intake pipe 21 was integrated into the sealing lid 12, which made it difficult to fine-tune the sealing lid's mounting position during installation and made it impossible to remove the water intake pipe independently for maintenance, resulting in poor workability.

Furthermore, with a structure using only one water intake pipe 21, it is necessary to prepare a specially designed pump with a firefighting pipe joint for the suction pipe as the water supply pump. This not only increases costs, but also poses the risk of not being able to quickly prepare a replacement pump if the water supply pump breaks down during a disaster.

This invention was made to solve the above problems, improving the ease of adjusting the position of the sealing lid 12 and water intake pipe during installation and maintenance, as well as the ease of maintenance. It also aims to solve the problems that arise on the water supply pump side when only one water intake pipe is used, thereby providing a water intake device with a structure that allows for easier maintenance.

The water intake device for an emergency water tank of this invention is equipped with a riser pipe seat 13 with a mounting flange 14 at its upper end, located above a through-hole provided in a sealing cover 12 that seals the manhole tube 11 of the water tank body 1. The riser pipe seat 13 has an inner diameter larger than the outer diameter of the water intake pipe 21. An upper flange 22 welded to the upper end of the water intake pipe 21 or an intermediate flange 23 welded below it with a distance large enough to insert a tool for attachment and detachment is fixed to the mounting flange 14 of the riser pipe seat 13. The above-mentioned problem is solved by attaching a water supply pipe fitting 27 or a fire service pipe fitting 28 to the upper flange 22 via a repair valve 24 and necessary connecting short pipes 25, 26 or fittings 38 for connecting to a water supply pump or fire hose.

Furthermore, in the emergency water tank water intake device of this invention, which uses a single water intake pipe 21, the above problem is solved by attaching a fire protection pipe fitting 28 to the repair valve 24 via one-touch male and female water supply pipe fittings 27a, 27b.

This invention allows the water intake pipe 21 to be easily removed from the sealing lid 12 as needed, facilitating the positioning and attachment/detachment of the water intake pipe 21 and sealing lid 12 during installation, maintenance, and inspection of the emergency water tank. This improves workability at the water tank installation site, allowing these tasks to be performed easily and in a short time.

Furthermore, even with a single water intake pipe 21, it is possible to quickly connect a water supply pump and fire hose equipped with standard pipe fittings, eliminating the need to change pipe fittings and preventing the increased costs associated with changing pipe fittings. If the water supply pump does not work in an emergency, a replacement pump can be quickly arranged, resulting in more reliable water supply operations even in emergencies.

1 is a partial cross-sectional front view showing an example of a water intake device of the present invention equipped with two water intake pipes. FIG. 2 is an enlarged cross-sectional view showing a main part of FIG. 1; FIG. 1 is a partial cross-sectional front view showing an example of a water intake device of the present invention having one water intake pipe. FIG. 2 is a view similar to FIG. 1 showing the installation structure of the intake pipe without an intermediate flange. FIG. 2 shows a conventional structure of a water intake device corresponding to FIG. 1.

The water intake device of this invention will be specifically described below with reference to the drawings showing the embodiments. Figures 1 and 2 show an example in which this invention has been applied to the water intake device of the conventional structure shown in Figure 5.

A main body flange 15 is welded to the upper end of the manhole tube 11, which is integral with the water tank main body 1, and a sealing lid 12 is detachably attached to the main body flange 15. A riser pipe seat 13 is welded to the sealing lid 12 and stands upright on the sealing lid 12. The base end of the riser pipe seat 13 is inserted and fixed into a through-hole provided at the position where the water intake pipe 21 passes through.

An upper flange 22 and an intermediate flange 23 are welded to the upper and lower ends of the intake pipe 21. The intake pipe 21 is narrower (e.g., 80A) than the inner diameter of the riser pipe seat 13 (e.g., pipe diameter 100A), and is inserted into the riser pipe seat 13, with the flanges 14 and 22 fastened in place with bolts and nuts. Therefore, the intermediate flange 23 is an irregular-shaped flange (in the above example, a 100A-type flange with an inner diameter of 80A). The upper flange 22 is a standard flange (in the above example, an 80A-type flange) that corresponds to the pipe diameter of the intake pipe 21.

The water intake pipes 21 of the above structure pass through the sealing lid 12 and open at their ends into a water collection pit located at the bottom of the water tank body 1. Each of the upper flanges 22 of the two water intake pipes 21 is fitted with a water supply pipe fitting 27 (e.g., the male side of a camlock fitting) on one side and a fire protection pipe fitting 28 (e.g., the male side of a Machino fitting) on the other side, via a repair valve 24 similar to that of a conventional structure and, if necessary, a short pipe 26. These pipe fittings 27, 28 are fitted with caps 31, 32 that close the openings of the fittings when not in use.

When opening the sealing lid 12, the intake pipe's intermediate flange 23 is removed from the riser pipe seat 13. Even if the intermediate flange 23 is stuck to the mounting flange 14, the upper flange 22 can be grasped and pulled out, making it easy to remove the intake pipe 21 from the riser pipe seat 13. The intake pipe 21 can also be removed from the sealing lid 12 while the repair valve 24 and pipe fittings 27 and 28 remain connected to the intake pipe 21.

Figure 3 shows a second embodiment with a single water intake pipe 21, in which a fire protection pipe fitting 28 is connected to a repair valve 24 via male and female water supply pipe fittings 27a and 27b. In the example shown in Figure 3, a repair valve 24 with a taper pipe thread connection is connected via a short pipe 29 with a lower flange 33 at its lower end that connects to the upper flange 22 of the water intake pipe and a male taper pipe thread 34 at its upper end. The male side of a fire protection pipe fitting 28 is connected to the repair valve 24 via the male and female water supply pipe fittings 27a and 27b. In the example shown, the water supply pipe fittings 27 (27a and 27b) are camlock fittings, and the fire protection pipe fitting 28 is a male Machino fitting, with a Machino female cap 32 attached to its open end.

With this structure, the fire hose can be connected immediately by removing the cap 32, and by removing the female connector 27b of the cam lock type coupling, a water supply pump equipped with a standard coupling can be directly connected.

The intake pipe 21 of the third embodiment shown in Figure 4 has only an upper flange 22 and no intermediate flange. After the sealing cover 12 is fixed to the manhole cylinder 11, the intake pipe 21 is inserted into the upper end of the riser pipe seat 13 and fixed in place with the upper flange 22 of the intake pipe sandwiched between the lower flange 33 of the connecting short pipe 25 and the mounting flange 14. Naturally, gaskets are installed between these flanges 14, 22, and 33 to keep the pipe sealed.

This structure, in which the upper flange 22 is sandwiched between the mounting flange 14 and the lower flange 33 attached to the connecting short pipe 25, does not pose any problems when installing the water tank body, but when removing the water intake pipe 21 during maintenance and inspection inside the water tank body, there is no gripping area, making it less easy to remove the water intake pipe 21 than the structure of the first embodiment.

In other words, in the structure shown in Figure 4, the upper flange 22 of the intake pipe is fastened between the riser pipe seat 13 and the short pipe 25 and is attached to the mounting flange 14, and it is time-consuming to remove the upper flange 22 without damaging it, so the structure shown in Figure 1 is preferable.

As can be seen from the above explanation, this invention allows for extremely simple structural changes to facilitate the attachment and detachment of the water intake pipe 21 and sealing lid 12 during installation and maintenance of the emergency water tank, and also has the effect of enabling a water supply pump or fire hose to be reliably and quickly connected to the water intake pipe 21 in an emergency.

REFERENCE SIGNS LIST 1 Water tank body 11 Manhole tube 12 Sealing cover 13 Standpipe seat 14 Mounting flange 21 Water intake pipe 22 Upper end flange 22
23 Intermediate flange 23
24 Repair valve 27 (27a, 27b) Water supply pipe joint 28 Fire fighting pipe joint

Claims (3)

A water intake device for an emergency water tank, comprising a sealing cover for closing a manhole provided at the top of the water tank body, a water intake pipe that penetrates the sealing cover and opens at the bottom of the water tank body , and a water supply or firefighting pipe joint connected to the upper end of the water intake pipe via a necessary repair valve,
a riser pipe seat having an inner diameter larger than the outer diameter of the water intake pipe and integrally formed above the through hole of the sealing lid, the water intake pipe being inserted into the riser pipe seat and the through hole and removably fixed to open to the bottom of the water tank body , and the fire fighting pipe fitting being connected to the water intake pipe via a water supply pipe fitting and necessary repair valves . The water intake device for an emergency water tank according to claim 1, wherein the water intake pipe integrally comprises an upper end flange at its upper end and an intermediate flange fixed below the upper end flange, and the intermediate flange of the water intake pipe is detachably fixed to the mounting flange at the upper end of the riser pipe seat. A water intake device for an emergency water tank is provided with a water intake pipe that penetrates a sealing cover that closes a manhole provided at the top of the water tank body and opens at the bottom of the water tank body, and a fire-fighting pipe joint connected to the upper end of the water intake pipe via a necessary repair valve.
A water intake device for an emergency water tank, wherein the fire service pipe joint is connected via a one-touch water supply pipe joint that connects the necessary repair valve and water supply pump.