JP5577482B2 - Fushie pipe - Google Patents

Description

  The present invention relates to a subway pipe where a sewer, an irrigation canal and the like are once deeply submerged in a concave shape and are used to pass over obstacles such as rivers, roads and railways.

The subsidence pipes in sewers and the like must be able to flow down the maximum water flow in the water channel, and therefore, a flow rate that is too low in normal times will flow down. Make it easier.
Generally, a pumping equipment such as an air lift pump or a submersible motor pump is installed at the vertical hole of the overpass pipe and removed periodically.

  In recent years, in order to solve such problems, a double overpass pipe system in which a small diameter overpass pipe is arranged in a large main overpass pipe, and a door that can be opened and closed at the entrance of the horizontal overpass pipe section. Alternatively, the inlet / outlet flow path of the horizontal pipe part is lowered, the intermediate horizontal pipe part is formed one step higher, an air pool is provided, and the water flow adjustment area of the horizontal pipe part can be adjusted by adjusting the air amount. There is a thing of the water flow area adjustment method.

  JP2003-253738   JP 2005-126941 A   JP 2006-161289 A   JP 2010-19076 A

  In the conventional general overpass, the sediment tends to accumulate near the upstream end and the downstream end of the horizontal overpass, and there is also sediment accumulation over the entire length of the horizontal overpass. At the time of water increase, there is a problem that the sediment is pushed near the end of the downstream vertical hole at a stretch and becomes in a closed state, thereby obstructing smooth water flow.

In the double-passover pipe system, the small-diameter overpass pipe in the form of inclusion can pass water without much trouble with many opportunities for full water flow, but in addition to the lower flow velocity in the main overpass pipe, There is a problem that the residence time is increased and the organic matter mixed in the water is rotted, and gas and odor are likely to be generated.
In addition, in the case of the water flow area adjustment method, the follow-up and complexity of air amount adjustment for door opening and closing and pipe cross-sectional area adjustment at the time of sudden increase in water due to particularly heavy torrential rain in recent years, complicated, There is a problem of adverse effects such as a manhole cover blow-up accident due to sudden air discharge.

  In the present invention, a double-passover pipe in which a small-diameter overpass pipe in the form of a large main overpass pipe is arranged. Pay attention to the position and height so as to preferentially flow into the small-diameter inflow vertical pipe, open it by providing a weir, etc., and at the outflow vertical pipe end of the small-diameter overpass pipe, Lower than normal so that the water flow below the normal level can be preferentially performed by the small-diameter overpass.

The small-diameter horizontal pipe section of the small-diameter pipe is placed in the shape of the bottom center of the main horizontal pipe section of the main overpass pipe. It is easy to slide in the direction of the central small diameter horizontal pipe.
At the same time, a mud suction port communicating with the main underpass pipe is closed at the lower end of the downstream end of the small diameter horizontal pipe, and a communication hole communicating with the main overpass pipe is constricted in the middle of the small diameter inflow vertical pipe. Make a hole.
If the suction port for narrowing the small-diameter horizontal pipe is the lower side of the small-diameter horizontal pipe, it can be closed near the upstream end or in the middle. May not open.
Further, a large number of air injection holes are provided at the lower side of the small diameter outflow pipe of the small diameter overpass pipe so that compressed air can be injected, and the small diameter outflow pipe itself has an air lift pump function.

The above-structured substituting pipe of the present invention is a small-diameter subsiding pipe in which the amount of water below normal is operated in a small-diameter subsiding pipe and the internal speed is kept as high as possible so that mixed solids are difficult to settle. .
In the case where a communication hole is provided in the middle of the small-diameter inflow vertical pipe, a part of the small-diameter overpass pipe water flows out to the main overpass pipe side where the flow resistance is small and accumulates near the mud inlet. It also has the effect of reflowing into the small diameter overpass pipe while scouring and mixing the sediment in the overturn pipe and exchanging the accumulated water in the main overpass pipe.
In the case where the suction port is narrowed long in the flow line direction without providing a communication hole, even if the suction port is buried, the scouring and mixing action works as shown in the patent No. 3895505, Eliminate external main passover pipe deposits.

When the water flow exceeds the normal amount of water, water flow also starts in the main subsidence pipe, and when the flow rate is low, the sediment slides and jumps at the bottom of the main horizontal pipe according to the flow rate in the pipe. It gathers in the vicinity of the end, and is removed by suction or scouring and mixing into the small-diameter overpass pipe from the suction port.
If the amount of water flow increases, the mixed solids or sedimentary sediments are flowed away by the flow rate itself in the main overpass pipe.
As described above, it becomes a safe cover tube that does not require any external operation during this period.

  When a very small amount of water below normal water flow continues for a long time, compressed air is injected from the air inlet and forced drainage is performed by operating the air lift pump function. It is possible to eliminate the accumulated water drainage and sedimentary sediment, prepare for a rapid increase in water, and also help to replace the accumulated water, which is convenient for preventing the decay of mixed organic substances and suppressing the generation of malodor.

  Also, forcibly draining by operating the air lift pump function on a regular basis increases the flow velocity at the flow rate, making it easier to remove the accumulated solid matter that has accumulated, It is possible to eliminate sediment in the tube.

As described above, the subsidence pipe of the present invention, even in sewers with a large amount of mixed solids, is very naturally deposited from the time of passing a very small amount of water to the amount of water at the peak or when the flow rate is suddenly increased. It can be operated with deposition prevented or eliminated.
In addition, forced drainage by the air lift pump function strongly removes sediments, prevents solidification of sediments due to long-term residence, and greatly suppresses the contamination of organic matter, gas, and odor generation due to replacement of the residence water. Contribute to improvement.
In addition, the present invention having a simple configuration in this kind of facility is very preferable for maintenance.

Sectional drawing of the double depression pipe which shows this invention, BB sectional view of FIG. FIG. 2 is a top view of a double sag tube showing the present invention, a cross-sectional view taken along line AA of FIG. 1. CC sectional view of FIG. The lower side enlarged view of FIG. The GG and HH sectional view of FIG. FF sectional drawing of FIG. DD sectional drawing of FIG. The EE sectional view of Drawing 1 is shown.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

In FIG. 1, which is a cross-sectional view of an embodiment facility to the sewer of the present invention, the main horizontal pipe 3 and the main inflow vertical pipe 5 provided deep between the upstream pipe 9 and the downstream pipe 10. And a main overpass pipe 1 constituted by the main outflow vertical pipe 7 is provided.
The main overpass tube 1 is arranged along the wall surface or bottom surface so as to include a small diameter overpass tube 2 composed of a small diameter horizontal tube 4, a small diameter inflow vertical tube 6, and a small diameter outflow vertical tube 8. As shown in FIGS. 4 and 6, the cross-sectional shape of the main horizontal pipe 3 is provided with an inclined surface a so as to form a hollow shape, so that the precipitate can be guided near the central small-diameter horizontal pipe 4.
In the figure, the direction of sewage flow is indicated by three arrows.

As shown in FIGS. 2 and 5, the upper end opening of the small-diameter inflow vertical pipe 6 is provided with a weir 11 to preferentially flow the flowing water from the upstream pipe rod 9 into the small-diameter overpass 2.
A weir 12 is also provided at the upper end opening of the small-diameter outflow pipe 8 in the same manner as the inflow side to avoid backflow into the main overpass pipe 1.

As shown in FIG. 7, a communication hole 14 communicating with the main inflow vertical tube 5 is formed in the middle of the small diameter inflow vertical tube 6.
An air injection hole 16 is formed at the lower side of the small-diameter outflow pipe 8 so that the compressed air of the compressor 17 can be injected through the pipe 15.
On the lower side near the downstream end of the small-diameter horizontal pipe 4, a mud suction port 13 as shown in an enlarged view in FIG.

  In FIG. 1, the height positions of the zeniths b and c of the upstream pipe rod 9, the downstream pipe rod 10, and the weirs 11 and 12 are appropriately determined in consideration of the downflow gradient of the depression tube.

  With the configuration of the embodiment as described above, the maximum water flow rate of the small diameter bypass tube 2 is set to be equal to or less than the normal peak water flow rate, so that the set water amount is reached on a daily basis (for example, once a day). A sufficient flow rate is obtained, sediment sediment generated in the small-diameter horizontal tube 2 at the minimum flow rate is eliminated, and solidification of the sediment is prevented.

In addition, in the main overpass pipe 1 where there is no water flow at a small flow rate, part of the water flow through the small diameter overpass pipe 2 leaks from the communication hole 14 and creates a partial flow in the main overpass pipe 1 to absorb the water. It flows again into the small-diameter overpass pipe 2 from the mud opening 13.
The mixed solid matter in the main staying pipe 1 in the staying state has a very small amount of new inflow, is light and fine, and may be carried in the partial flow described above. At the same time, the inflow is eliminated again into the small-diameter overpass 2.

  When extremely small amounts of water flow continues for a long period of time, or when residual sediment is assumed, the air lift pump function is activated, forced drainage is performed, and the inside of the small diameter overpass pipe 2 and the main overpass pipe 1 By draining while removing the sediment deposited around the mud suction port 13, it is possible to prevent the long-term staying water state of the same water.

  The seductive pipe of the present invention is a safe construction of a seductive pipe facility that has a simple structure and does not cause sediment accumulation accidents in sewers, rainwater drainage channels, irrigation canals, etc. where solids are mixed in the water flow, and has little environmental degradation. Can be provided.

DESCRIPTION OF SYMBOLS 1 Main overpass pipe 2 Small diameter overpass pipe 3 Main horizontal pipe 4 Small diameter horizontal pipe 5 Main inflow vertical pipe 6 Small diameter inflow vertical pipe 7 Main outflow vertical pipe 8 Small diameter outflow vertical pipe 9 Upstream pipe 10 Downstream pipe DESCRIPTION OF SYMBOLS 11 Inflow side weir 12 Outflow side weir 13 Mud inlet 14 Communication hole 15 Air piping 16 Air injection port a Inclined surface of main horizontal pipe bottom Zenith of inflow side weir c Zenith of outflow side weir

Claims (3)

  Small double-passage pipe with small-diameter overpass pipe that preferentially passes inflow water at the time of a small amount of water in a double-passover pipe that has a small-diameter overpass pipe that is included in the main overpass pipe. With the bottom of the main section being in contact with the bottom of the main horizontal overpass pipe and the lower side of the small diameter horizontal overpass pipe with a mud opening communicating with the main overpass pipe tube.   2. The overpass pipe according to claim 1, wherein an inlet for compressed air is provided at the lower side of the small diameter outflow pipe of the small diameter overpass pipe, and the small diameter outflow pipe is provided with an air lift pump function. FukuEtsukan according to any one of claims 1 and 2, the communication hole was窄穴communicating with the main saphenous Yue tract diameter inlet elevational hole pipe diameter Fushimi Yue tube.

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