JP4088134B2 - Destructor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a depressurizer used for depressurizing a high-speed water flow.
[0002]
[Prior art]
For example, rainwater that flows through drainage pipes and sewage pipes that are piped on sloping ground, domestic wastewater, and sewage water, etc., are high-speed water currents, so if they are discharged into manholes to which the pipes are connected, In order to release the collision energy, there is a risk of damaging the manhole housing or pipe material. For this reason, in a manhole or the like that is usually installed at a place where such a high-speed water flow is expected, it is necessary to provide equipment for reducing the energy of the high-speed water flow.
[0003]
As such a manhole, it is a depressurization work used to depress high-speed water flow discharged from pipes such as sewage pipes piped on an inclined land, and a depressurization tank having an inlet and an outlet And a weir disposed at a predetermined interval in front of the outlet of the depressurization tank, and the weir has a through hole or a slit communicating with the inlet side and the outlet side. In addition, there is known a depressurizer characterized in that the upper end of the weir is located at a position higher than 1/4 of the diameter of the inflow pipe with respect to the bottom of the inflow pipe connected to the inlet of the deration tank. (For example, refer to Patent Document 1).
[0004]
In general, in the depressurization work, the flow velocity decreases at the outflow part due to the depressurization of the high-speed water flow, and the flow cross-sectional area of the outflow part becomes larger than the cross-sectional area of the inflow part, so when the weir is particularly high, When the distance between the weir and the outflow pipe is short, or when the outflow pipe size is small, etc., the outflow pipe will be blocked by sewage, etc. that overflows the weir. It is necessary to install an air bypass pipe that communicates with each other.
[0005]
And in the depressurization work of patent document 1, you may provide the passage for air bypass which connects the upper part in a depressurization tank, and the inside of the inflow pipe connected to the inflow mouth of a depressurization tank. In addition, an air bypass passage may be provided that communicates the upper part in the depressurization tank and the inside of the outflow pipe connected to the depressurization increase outlet. Further, both the inflow side air bypass passage and the outflow side air bypass passage may be provided.
[0006]
In this air bypass, when a large amount of sewage or the like flows in, the air contained in the sewage that has flowed in breaks down, or the air that is pushed into the outflow pipe by the large amount of sewage remains in the outflow tube. In order to prevent the air from flowing smoothly into the outflow pipe, the air remaining in the outflow pipe is provided for the purpose of returning it to the inflow pipe side or the depressurization tank.
[0007]
[Patent Document 1]
JP 2002-201706 A ([0036], FIG. 12, FIG. 13)
[0008]
[Problems to be solved by the invention]
However, since the air bypass pipe is attached to the outside of the maneuvering body (manhole) in the above-mentioned mitigation work, it is necessary to have a strength that can withstand the earth load and the load of the vehicle. Therefore, it is necessary to take measures such as reinforcing the bypass pipe itself and the manhole connection part with concrete, etc., which raises material costs and civil engineering work costs, and the construction period is long and the work is troublesome. .
[0009]
Corresponding to the case where a large amount of sewage flows in, in order to smoothly flow this large amount of sewage into the outflow pipe, if the distance between the weir and the outflow pipe is increased, the inflow side will be relatively reduced. Since the work volume is reduced, it is necessary to increase the size of the depressurization work itself, and similarly, there is a problem that the cost is high.
[0010]
The present invention solves the problems of the above-mentioned conventional depressurization work, and even when the weir is high, when the distance between the weir and the outflow pipe is short, or when the outflow pipe size is small, the outflow pipe is blocked by sewage or the like. This was done for the purpose of providing inexpensive depressurization work that can be prevented.
[0011]
[Means for Solving the Problems]
According to claim 1 of the present invention for solving the above-mentioned problems, a depressurizer (invention 1) is provided with a dam plate for depressing a high-speed water flow flowing in from an inflow pipe, and is reduced by colliding with the dam plate. An air flow passage that has a space through which air flows between the inside of the depressurization work and the inside of the outflow pipe, and is a depressurization work in which the energized flowing water passes over the weir plate and flows out to the outflow pipe. Is provided in the inside of the depressurizer and the inside of the outflow pipe, and the air flow passage divides the vicinity of the inner wall of the depressurizer from the upper part of the outflow pipe base end with a partitioning material, and the partitioning material And a continuous space surrounded by the inner wall surface of the upper part of the outflow pipe and the inner wall surface of the depressurizer .
[0012]
The depressurizer according to claim 2 (invention 2) is provided with a dam plate for depressing a high-speed water flow flowing in from the inflow pipe, and the dewatered water that collides with the dam plate gets over the dam plate, It is a pressure reducing work that flows out to the outflow pipe, and has a space for air to flow between the inside of the pressure reducing work and the inside of the outflow pipe, and an air flow passage that communicates each space is provided inside the pressure reducing work and the inside of the outflow pipe. provided, place the air flow passage, energy dissipator mounting the vicinity of the outflow pipe is a larger diameter are reduced in diameter toward the downstream side outlet tube, which is the normal pipe diameter, which is enlarged It is the depressurization work characterized by being the upper space and the depressurization work outflow pipe mounting part upper space.
[0014]
According to the first and second aspect of the present invention, the dam plate is provided with a dam plate on the bottom surface thereof, and a high-speed sewage flow or the like that has flowed into the rectifier from the inflow pipe collides with the dam plate to form an ascending vortex. It rises upward, overflows the weir and flows into the outflow pipe. As described above, in the energy reducing work of the present invention, the water flow that has flowed into the power reducing tank is forcibly raised by the weir, thereby diverging (decreasing) the kinetic energy of the water flow in the height direction of the power reducing tank. Is.
[0015]
The depressurizer is usually made of concrete, but may be made of FRP (fiber reinforced synthetic resin). FRP is lightweight and preferable in terms of corrosion resistance in the case of sewage.
[0016]
The dam plate may be made of concrete as a unit with the depressurizer, for example, made of metal, alloys such as iron, aluminum, stainless steel, and brass; synthetic resin such as FRP and FRPM (resin concrete). This may be attached to a predetermined position on the bottom surface of the depressurization work. Further, the dam plate may be provided with a through hole or a through slit, and when applied to a sewer, it is preferable that the dam plate has a size that allows filth to pass through.
[0017]
The shape of the weir plate can change the direction of the sewage that has collided to the upper side of the smooth surface if the portion in contact with the depressurizer is an inclined surface. Further, in the width direction, it is not necessary to continuously divide the inside of the depressurization work by the outer weir, and both ends and the intermediate part may be cut off.
[0018]
In the air flow passage, when a large amount of sewage flows into the depressurization work, the air contained in the sewage that has flowed in breaks up or the air that is pushed into the outflow tube by the large amount of sewage remains in the outflow tube Thus, in order to prevent the sewage from smoothly flowing into the outflow pipe, the air remaining in the outflow pipe serves to return to the depressurization side.
[0019]
According to the first aspect of the present invention, in the first embodiment, the inner wall of the outflow pipe is divided from the back of the upper part of the outflow pipe in the vicinity of the lowering work attachment part by the partition plate. A continuous space surrounded by the wall of the de-energizing work is used as an air flow passage. The cross-sectional shape of this space is not particularly limited. For example, it may be a substantially rectangular shape, an ellipse surrounded by a curved surface, an egg shape, or the like. Moreover, it is desirable that the uppermost side of the partition plate be sufficiently high so that sewage or the like stored in the derating construction does not flow into the air flow passage.
[0020]
The sewage that overflows the weir plate collides with the partition plate and flows along this to the outflow pipe. At this time, the flow path of the sewage is slightly narrowed by the partition plate at this time, and when the amount of sewage is large, the flow path of the sewage becomes full. However, since the air flow passage is secured, the air in the outflow pipe is returned to the depressurization work with the inflow of sewage or the like, so that the sewage or the like flows smoothly into the outflow pipe.
[0021]
The length of the partition plate arranged at the upper part in the outflow pipe from the attachment part of the outflow pipe toward the back is made longer than the distance at which the sewage flowing therein becomes a steady flow. That is, if the flow is steady, the water level becomes stable and an air layer is formed on the upper part of the outflow pipe, so that the air layer and the space inside the depressurization work are communicated.
[0022]
As partition plates, anticorrosion-treated metals and alloys such as iron, aluminum, stainless steel, and brass; synthetic resins such as vinyl chloride resin, polyethylene, polypropylene, FRP, and FRPM; plants such as wood and bamboo; concrete, Examples thereof include inorganic materials such as ceramics. Of these, metals, alloys, and synthetic resins are preferably applied in terms of corrosion resistance, workability, and strength.
[0023]
This air flow passage may be a pipe provided along the inner wall of the depressurization work from the upper part of the outflow pipe. In this case, since the pipe is simply stopped by a stay or the like on the outflow pipe wall or the derating wall, there is an advantage that the air flow passage installation work is simplified compared to the case where the partition plate is provided.
[0024]
In the case of a pipe, synthetic resin pipes such as vinyl chloride resin, polyethylene, prepropylene, and pributene; metal pipes such as anticorrosion iron pipes and stainless steel pipes, and inorganic material pipes such as ceramic pipes and fume pipes. Of these, synthetic resin pipes and metal pipes are preferably applied in terms of corrosion resistance, workability, and strength.
[0025]
According to the second aspect of the present invention, the air flow passage is expanded in the diameter of the outflow pipe having a large diameter in the vicinity of the depressurization attachment portion of the outflow pipe and reduced in diameter toward the downstream side to a normal pipe diameter. It is used as the upper part of the area and the attachment part to the de-energizer.
[0026]
The inner diameter of the outflow pipe near the depressurization attachment portion may be larger as the distance between the weir plate and the outflow pipe connection portion of the inner wall of the desorption work is shorter, and may be smaller as the distance is longer.
[0027]
The inner diameter of the outflow pipe is reduced toward the downstream side from the depressurization attachment portion, and is set to a normal pipe diameter at a point where sewage or the like flowing down flows in a steady state. The tube may be gradually reduced in diameter, or the tube diameter may be reduced stepwise. Alternatively, the pipe may be piped up to a desired distance and returned to the normal thickness at that point. In both cases, the normal thickness is returned to the point where the sewage flowing down flows in a steady state.
[0028]
Sewage that overflows the weir plate flows into the outflow pipe, but when the distance between the overflow weir and the outflow pipe is close, it flows into the outflow pipe at a water level close to the height of the overflow weir. However, the upper end height of the outflow pipe is kept at that level until the upper end height of the outflow pipe is made higher than the water level height and the water level is stabilized until the water level stabilizes. Air is not pushed into the back of the outflow tube, so the sewage flow flows through the smooth outflow tube.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the implementation of a derating work. FIG. 2 is a cross-sectional view showing another example of the implementation of the depressurization work. FIG. 3 is a cross-sectional view showing still another example of the implementation of the derating work.
[0030]
A dam plate 2 is provided on the bottom surface of the depressurizer 1, and high-speed sewage and the like flowing in from the inflow pipe 3 collide. Sewage or the like collides with the weir plate 2 and its traveling direction is changed upward, and energy is reduced. The space of the energy reducing work 1 from the sewage inlet 1a to the weir 2 serves as an inflow side temporary storage part 11 for sewage or the like.
[0031]
The sewage or the like that has collided with the weir plate 2 rises to a height H1 and overflows the weir plate 2. The overflowed sewage flows into the outflow pipe 4 from the sewage outlet 1b. The space of the depressurization work between the weir plate 2 and the sewage outlet 1b becomes the outflow side temporary storage part 12 for the sewage or the like flowing out.
[0032]
A partition plate 5 divides the depth of the outflow pipe 4 from the back upper pipe wall of the outlet 1b to the vicinity of the inner wall of the pressure reducing work 1 above the outlet 1b. The continuous space surrounded by is an air flow passage 51. The uppermost end side of the partition plate 5 is sufficiently higher than the water level H <b> 1 so that sewage or the like stored in the energy reducing work 1 does not flow into the air flow passage 51.
[0033]
The length of the partition plate 5 from the outflow port 1 b in the outflow pipe 4 is appropriately changed depending on the volume of the outflow side temporary storage unit 12. That is, the distance from the outlet 1b until the sewage flowing through the outflow pipe 4 becomes a steady flow changes depending on the volume of the outflow side temporary storage unit 12. When the capacity | capacitance of the outflow side temporary storage part 12 is small, what is necessary is just to lengthen the length from the outflow port 1b, and should just be decided suitably according to a condition.
[0034]
FIG. 2 is an example in which the air flow passage 51 is a pipe 6. Also in this case, one end portion of the pipe is set higher than the water level H1, and the position of the other end arranged in the outflow pipe is set to a length longer than the distance until the sewage flowing through the outflow pipe 4 becomes a steady flow.
[0035]
The method of attaching the pipe 6 is not particularly limited as long as it is fixed to the inner wall of the depressurization work 1 or the upper wall of the outflow pipe 4 using a normal pipe support.
[0036]
FIG. 3 shows an example in which the outflow pipe 4 having a large inner diameter of the outlet 1b is provided. The upper pipe wall height H2 inside the outlet 1b is substantially the same as the overflow water level H1 of the weir 2, and the large diameter portion length L of the outflow pipe 4 is such that the sewage flowing through the outflow pipe 4 is a steady flow. It is said that it is more than the distance to become. When the capacity of the outflow side temporary storage unit 12 is small, the length can be appropriately determined according to the situation because the air flow passage can be secured by increasing the length.
[0037]
Even if the weir plate 2 is high and the water level H1 such as sewage overflowing from the inflow side temporary storage part 11 is high, the position of the opening of the air flow passage 51 is made higher than H1 or the height H2 of the outlet 1b is set to Just make it high. Further, even if the distance between the weir plate 2 and the outlet 1b is small and the volume of the downstream temporary water storage section 12 is small, it is only necessary to increase the insertion length L of the air flow passage 51 into the outflow pipe 4. There is no need to increase the size of the depressurizer 1. Further, when the outlet 1b has a large diameter and the length L of the outflow pipe 4 is sufficiently long, the length L of the outflow pipe 4 is sufficiently long. Since an air layer is formed and communicates with the space in the pressure reducing work 1, the outflow pipe 4 is not blocked even if the diameter of the outflow pipe 4 is small.
[0038]
In addition, all of these air flow passages 51 are arranged and installed in the inside of the depressurizer 1 and the outflow pipe 4. Therefore, as compared with the conventional method in which an air bypass pipe is provided outside the energy reducing work 1, reinforcement or the like is unnecessary, and members and man-hours are reduced.
[0039]
【The invention's effect】
As described above, the depressurization work of the present invention can prevent the outflow pipe from being blocked by sewage even when the weir is high, when the distance between the weir and the outflow pipe is short, or when the outflow pipe size is small. It becomes a depressurizer and can be provided at low cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a reduction work.
FIG. 2 is a cross-sectional view showing another example of the implementation of the derating work.
FIG. 3 is a cross-sectional view showing still another example of the implementation of the depressurization work.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reducer 11 Inflow side temporary storage part 12 Outflow side temporary storage part 1a Inlet 1b Outlet 2 Dam plate 3 Inlet pipe 4 Outlet pipe 5 Partition plate 51 Air flow path 6 Pipe H1 Overflow water level H2 Outlet height L Large diameter length of outflow pipe

Claims (2)

A dam plate is provided to reduce the high-speed water flow that flows in from the inflow pipe, and the dam plate that collides with the dam plate gets over the dam plate and flows out to the outflow pipe.
There is a space for air to flow inside the depressurizer and inside the outflow pipe,
Air flow path communicating the respective space is provided inside the outlet pipe and the internal energy dissipator,
The air flow passage is partitioned from the upper part of the outflow pipe base end by the partition material in the vicinity of the inner wall of the depressurization work above the outflow pipe base end,
A depressurization work characterized in that it is a continuous space surrounded by the partition material, the upper inner wall surface of the outflow pipe, and the inner wall surface of the depressurization work. A dam plate is provided to reduce the high-speed water flow that flows in from the inflow pipe, and the dam plate that collides with the dam plate gets over the dam plate and flows out to the outflow pipe.
There is a space for air to flow inside the depressurizer and inside the outflow pipe,
Air flow passages communicating with each space are provided inside the depressurizer and outflow pipe ,
The above air flow passage has a large diameter in the vicinity of the depressurization attachment portion of the outflow pipe and is reduced in diameter toward the downstream side so as to have a normal pipe diameter. A depressurization work characterized by being the upper space of the sewage outflow pipe mounting part .

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