JPH06701Y2 - Drainage pipe over levees - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a drainage pipe used for draining internal water over a dike to the surface side of the dike.

[Prior art]

Conventionally, in drainage pumping stations that discharge inland water, a water reservoir is provided in the inland water area, and the inner water guided from the water reservoir to the intake tank through the conduit is pumped up by a pump and the river is drained through the drain pipes that are installed from the back of the embankment to the front side. It is discharged to the channel.

Conventionally, pumps and drainage pipes for such drainage pump stations have been permanently installed, and the drainage pipes have been made of hard materials, such as steel pipes. However, such a drainage pumping station for internal water requires a huge amount of equipment costs for the homp and related equipment, but has a problem that the operating rate is extremely low. Moreover, since the drainage pipe is a conventional steel pipe, the installation and maintenance of this steel pipe is very time-consuming and costly, and since the dike is not opened, it is not possible to easily maintain the dike only at the drainage pump station. There was also a problem.

In order to eliminate the problems of the permanent drainage pump station as described above and to eliminate the need for permanent installation as a drainage pump station, an internal water drainage method has been developed in which a drain pipe is installed only when internal water drainage is required. There is. One of the methods is to use a hose capable of folding and winding part or all of the drainage pipe. Even in this case, it is preferable that the portion beyond the top end is made of a pipe made of a hard material such as a steel pipe and is solidified with concrete to open the top end on the road. Then, connect the hose backside hose to the steel pipe at the top, connect the hose to the front side of the levee, and install a discharge nozzle at the end to prevent water droplets from splashing to the top and reduce the actual lift. In order to generate the amount of water, the water level is lowered as much as possible on the embankment surface side.

[Problems to be solved by the device]

A steel pipe is used as the top end pipe as described above, and a pipe in which a hose is connected to the steel pipe is provided on the back side of the embankment, and this pipe is arranged so as to go down to the embankment front side. While the hose should remain cylindrical near the fitting upon delivery, the portion of the hose will dent or bulge and breathe, causing the hose to damage near the fitting and Drainage may have spurted out.

The present invention has been made in view of the above points, and solves the above problems in a drainage pipe in which a top pipe is made of a hard material and a foldable and wound hose is connected to the top pipe on the back side of the embankment. It is to provide a drainage pipe over the embankment that prevents hose damage.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a top end pipe made of a hard material on the top end, and a hose that can be folded and wound via a hose joint on the top end pipe on the back side of the embankment. In the above, the top pipe is a drain pipe that crosses a bank with a structure having a discharge nozzle, the lower end of the discharge nozzle is lower than the lower end of the hose joint, and the height difference between the lower end of the discharge nozzle and the lower end of the hose joint is discharged to the discharge nozzle. It is set to a value not more than the value obtained by adding the fluid friction loss head of the hose joint and the top pipe to the head loss due to.

[Action]

By configuring the drainage pipe over the embankment as described above,
Since the height difference between the lower end of the discharge nozzle and the lower end of the hose joint is set to be equal to or less than the sum of the head loss due to discharge in the discharge nozzle and the fluid friction loss head of the hose joint and the top end pipe, folding near the hose joint near the top end The breathing phenomenon that the windable hose is dented or swelled is eliminated.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of the embankment in the front and back direction. Inner water is guided from the water reservoir 1 in the inner water area to the water intake tank 3 through the screen 2. The water intake tank 3 is provided on the root side on the back side of the embankment 10. A pumping pipe 5 is installed on the upper wall 4 of the water intake tank 3.
Is attached, and the submersible motor pump 6 is attached to the lower end of the pumping pipe 5.
Is provided. The discharge pipe 7 above the pumping pipe 5 is connected to a conical pipe 9 via a valve 8. One end of the hose 12 is connected to the end of the conical pipe 9 via a hose joint 11,
The other end of the hose 12 has a bend 1 through a hose joint 13.
Connected to four. If the hose 12 is long,
It is relayed by the hose joint 15. The hose 12 reaches near the top of the bank 10 so as to be in contact with the lining and the back booth of the levee 10. This hose 12 is made of, for example, a soft vinyl chloride hose that can be folded and wound, and has a diameter of about 500 mm.

The top pipe 16 includes the bend 14, a straight pipe 17 extending horizontally on the top connected to the bend 14, a bend 18 connected to the bank side of the straight pipe 17, and a drain nozzle 19 connected to the bend 18. Has become. The tip of the drainage nozzle 19 leads to a headrace 21 that descends toward the river channel on the embankment surface side. Here, the top pipe 16 is a pipe made of a hard material, such as a steel pipe, a hard synthetic resin pipe, or a fume pipe. The straight pipe 17 is covered with concrete 22 and is open on the road.

Now, the lower ends of the straight pipe 17 and the drainage nozzle 19 and the head are shown as A, and the heads of the straight pipe 17 and the lower end of the hose joint 13 are shown as a.
Then, the head difference Aa is due to the loss head due to the discharge in the drainage nozzle 19 to the hose joint 13 and the top pipe 16.
Fluid friction loss is less than or equal to the sum of the heads.

As an example, if the pipe diameter of the top pipe 16 is 500 mm, the head difference A-a is about 0.2 m. Here, since the fluid friction loss of the hose joint 13 and the top pipe 16 is sufficiently smaller than the head loss due to the discharge from the drainage nozzle 19, it can be sufficiently approximated only by the calculation of the head loss due to the discharge from the drainage nozzle 19. .

As a result of an experiment using the above dimensions, the hose joint 1
The phenomenon that the hose 12 dented or expanded in the vicinity of 3 was eliminated.

[Effect of device]

As described above, according to the present invention, the lower end of the drainage nozzle is lower than the lower end of the hose joint, and the height difference between the lower end of the drainage nozzle and the lower end of the hose joint causes the loss head due to the discharge in the drainage nozzle to the hose joint and the top end pipe. Fluid friction loss is less than or equal to the value obtained by adding the water head, so the breathing phenomenon that the foldable and wound hose near the top end and near the hose joint dents or swells is eliminated, and the hose in this part may be damaged. There is an excellent effect that it does not exist.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the embankment of the present invention, in which a drainage pipe is laid over the embankment, in the front and back direction. In the figure, 1 ... water reservoir, 2 ... screen, 3 ... water intake tank,
4 ... Upper wall, 5 ... Pumping pipe, 6 ... Submersible motor pump,
7 ... Discharge pipe, 8 ... Valve, 9 ... Conical pipe, 10 ...
Embankment, 11 ... hose fitting, 12 ... hose, 13 ...
Hose fitting, 14 Bend, 15 hose fitting, 1
6-top pipe, 17-straight pipe, 18-bend, 19
・ ・ ・ Drainage nozzle, 21 ・ ・ ・ Conduit, 22 ・ ・ ・ Concrete.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Denki Kogyo Co., Ltd. Machinery Co., Ltd. 1-5 Omorikita, Ota-ku, Tokyo (71) Applicant 999999999 Rooster Island Co., Ltd. 1-1-1 Miyata-cho, Takatsuki-shi, Osaka No. 8 (71) Applicant 999999999 Hitachi, Ltd. 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo (71) Applicant 999999999 Mitsubishi Heavy Industries, Ltd. 2-5-1 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Karasawa Noritsugu 1-3-1, Otemachi, Chiyoda-ku, Tokyo Within the Kanto Regional Construction Bureau, Ministry of Construction (72) Inventor Yoshifumi Ogawa 1-3-1 Otemachi, Chiyoda-ku, Tokyo Within the Kanto Regional Construction Bureau (72) Inventor Yoichi Sekiya 1-3-1 Otemachi, Chiyoda-ku, Tokyo Within Kanto Regional Construction Bureau, Ministry of Construction (72) Inventor Shinpei Kokuhei, Tokyo Metropolitan Univ. Subdivision Hanedaasahi Town, 11th in the No. 1 Ebara Corporation

Claims (1)

[Scope of utility model registration request] 1. A top end pipe made of a hard material is provided on the top end, and a hose which can be folded and wound via a hose joint is provided on the top end pipe on the back side of the embankment, and the top end is provided on the front side of the embankment. The end pipe is a drain pipe that crosses an embankment having a discharge nozzle, the lower end of the discharge nozzle is lower than the lower end of the hose joint, and the height difference between the lower end of the discharge nozzle and the lower end of the hose joint is discharged to the discharge nozzle. A drainage pipe over a dike, wherein the head loss is less than or equal to a value obtained by adding the fluid friction loss head of the hose joint and the top end pipe.