JP5215124B2 - Method and apparatus for operating sewer subway structure - Google Patents

Description

  The present invention relates to a method and apparatus for operating a sewer underground structure.

  Generally, when it is necessary to lay an underground waterway across an obstacle such as a river, a railway, or an underground burial that is difficult to relocate, the sewer system (reverse siphon type communication passage) ) (See, for example, Patent Documents 1 and 2). Among the examples of the structure of the Fushigoe adopted in the field of combined sewerage systems, those that incorporate an air cushion siphon system are known (for example, see Non-Patent Documents 1 and 2). Explained. FIG. 3 shows a structural example of a type in which an air cushion chamber is formed by two gates.

  In this structure, as shown in FIG. 3 (a), an upstream sewage channel 1 and a downstream sewage channel 2 are provided on the upstream side and the downstream side with an obstacle 3 in between, and communicated with each of the sewage channels 1 and 2. Thus, an upstream side cover room 11 and a downstream side cover room 12 are vertically provided on both sides of the obstacle 3. And the lower end of both the overpass rooms 11 and 12 provided perpendicularly is connected by the overpass pipe 13 which let the underside of the obstacle 3 pass.

  In addition, gates 17 and 18 for closing the communication ports 15 and 16 from the upper side are provided at the communication ports 15 and 16 at both ends of the chambers 11 and 12 and the crossing tube 13 so as to be movable up and down. The gates 17 and 18 can be opened and closed by a drive mechanism (not shown). When the two gates 17 and 18 are closed to some extent as shown in FIG. 3B, an air reservoir space (hereinafter referred to as an air cushion chamber) P can be formed in the upper part of the overpass pipe 13. By introducing air into the space P from the external compressor 51 through the air pipe 40 and containing it, the cross section of the flow path through which the sewage in the overpass pipe 13 flows can be reduced and the flow can be accelerated.

  When operating this gate type air cushion / siphon system, as shown in FIG. 3 (a), the gates 17 and 18 are normally fully opened, and the flow passage cross section of the overpass pipe 13 is used widely as shown in FIG. Shed. When the cross section of the flow path is largely used, the flow becomes loose, and there is a possibility that the deposit T may accumulate in the overpass pipe 13. Therefore, the deposit removal operation as shown in FIG. 3B is performed at an appropriate timing. During the deposit removal operation, the gates 17 and 18 are closed to some extent. Then, air is introduced from the outside into the air cushion chamber P formed in the upper part of the inside of the overpass pipe 13 and held there, so that the cross section through which the sewage flows in the overpass pipe 13 is reduced. The flow is accelerated and the deposit T is washed away. By operating in this way, it is possible to reduce the burden of cleaning in the overpass pipe 13.

  In addition, it is possible to prevent deposits from being accumulated in the overpass pipe 13 in advance by switching between rainy weather and clear weather operation where there is a difference in the amount of sewage. That is, when the amount of sewage is fine, when the entire cross-section of the cross-over tube 13 is opened, the flow rate becomes slow and deposits are likely to accumulate. Therefore, the gates 17 and 18 are closed to an appropriate degree of opening. By confining the air in the transverse tube 13, the cross section through which the sewage flows is reduced and the flow is made faster. By doing so, it is possible to make it difficult for deposits to accumulate in the overpass pipe 13. Further, when the amount of sewage increases during rainy weather, the air sealed during fine weather is removed and the gates 17 and 18 are fully opened so that a large amount of sewage can flow.

As another known example, instead of the gate described above, air bags are arranged at both ends of the crossover pipe, and air is introduced into these air bags as needed to inflate the air bags. As a result, the both end communication ports of the overpass tube are closed by a predetermined cross section from the upper side, an air cushion chamber is formed in the upper part of the flow passage cross section of the overpass tube, and air is supplied to the air cushion chamber. In some cases, the substantial flow passage cross section of the overpass pipe is reduced by the introduction.

  As another known example, instead of the gate and the air bag described above, an elbow pipe with an opening facing downward is connected to both ends of the crossover pipe, and if necessary, the crossover pipe is used. In some cases, the air flow is introduced into the air passage and the air is trapped in the upper air cushion chamber in the cross-section of the crossover pipe. is there.

JP 2002-348948 A JP 2003-253739 A “Combined Sewerage and Fushikoshi” written by Hiroshi Suzuki, Public Investment Journal, Inc., December 25, 2002 Tokyo Metropolitan Sewerage Bureau Internet <URL: http://www.gesui.metro.tokyo.jp/odekake/syorijyo/03_13.htm>

By the way, in the conventional sewer subsidence structure mentioned above, there existed the following problems.
That is, for example, as shown in FIG. 4, when there is a downward slope toward the downstream side in the water channel in the overpass pipe 13, the gates 17 and 18 are closed to some extent and air is introduced into the air cushion chamber P. When the cleaning operation is performed, if the water depth d1 of the inflow portion to the overpass pipe 13 and the water depth d2 of the outflow portion from the overpass pipe 13 are the same, the flow velocity near the inflow portion and the outflow portion is Although it is the same, since the water depth D of the intermediate part before the downstream gate 18 is deep, the flow velocity of the part will become slow. That is, from the relationship of flow rate = cross-sectional area × flow velocity, the deep water depth portion has a larger effective cross-sectional area of the water channel than the other portions, and therefore the flow velocity is slow. As a result, the sand and the like deposited on the portion where the flow velocity is slow although the upstream and downstream gates 17 and 18 are operated to introduce air into the air cushion chamber P and perform the cleaning operation. Cannot be washed away, or sand or the like is further accumulated.

  In consideration of the above circumstances, the present invention is a sewer surpass that can prevent sand and the like from accumulating in a portion where the flow velocity is slow, or can effectively push sand that has already accumulated to the downstream side. It is an object of the present invention to provide an operation method and an operation apparatus for a structure.

  According to the first aspect of the present invention, there is provided a method for operating the sewer surpassing structure of the sewerage system, which is connected to the upstream sewer and the downstream sewer arranged with the obstacle interposed therebetween and extends below the obstacle. In the subsidence structure of a sewer, comprising an overcompartment and a downstream subsidence chamber, and an overpass pipe connecting the lower ends of the upstream and downstream subsidence chambers below the obstacle, A large number of floating bodies with a large submerged volume are floated in a part where the flow velocity is slower than other flowing water inside the overpass pipe, and the sewage is allowed to flow in the overpass pipe while holding the floating body in that position. It is said.

  The invention of claim 2 is the operation method of the sewer subsidence structure according to claim 1, wherein there is a portion where the depth of the flow path is deeper than others in the middle of the crossover pipe. It is characterized in that the portion corresponds to the slow flow rate portion.

  The invention of claim 3 is the operation method of the sewer underground structure according to claim 1, wherein there is a part where the width of the flow path is wider than the others in the middle of the crossover pipe. Corresponds to the slow part of the flow velocity.

  The invention of claim 4 is the operation method of the sewer underground structure according to claim 1, wherein the flow path in the overpass pipe is inclined downward from the upstream side toward the downstream side. Air supply means for introducing air into the overpass pipe, and air holding means for reducing the cross section through which the sewage flows by forming an air reservoir along the longitudinal direction in the upper part of the overpass pipe by the introduced air. As the air retaining means, the communication ports at the upstream and downstream side depression chambers and both ends of the crossover tube are closed, and the communication ports are closed from above to the upper part of the tube. A gate that forms a space for storing air is provided, and the upstream gate and the downstream gate are closed to an intermediate position, and air is introduced into the overpass tube, so that the upper portion in the overpass tube is formed. Form an air pocket along the longitudinal direction, The depth of water before the downstream gate when the cross section of the flow path through which the sewage is reduced is equivalent to the portion where the flow velocity is slow, and the depth of water before the downstream gate is deep. The plurality of floating bodies are floated on a portion, and the downstream gate is lowered to a position further lowered than the upstream gate in a state where a water channel is secured below the gate, thereby It is characterized by staying in front of the downstream gate and allowing sewage to flow in that state.

  Invention of Claim 5 is a driving | running method of the sewer underground structure of any one of Claims 1-4, Comprising: The said floating body is a thing of a granular form, a lump shape, or a ball shape, and It is characterized in that it can be washed away downstream, can be recovered downstream, or can be lost over time.

  The operation device of the sewer surpassing structure of the invention of claim 6 is connected to an upstream sewer and a downstream sewer arranged with an obstacle interposed therebetween, and extends upstream from the obstacle. In the subsidence structure of a sewer, comprising an overcompartment and a downstream subsidence chamber, and an overpass pipe connecting the lower ends of the upstream and downstream subsidence chambers below the obstacle, An air supply means for introducing air into the crossover pipe, and an air holding means for reducing the cross section through which the sewage flows by forming an air pool along the longitudinal direction in the upper part of the overpass pipe by the introduced air. Provided as the air holding means, at the communication ports of the upstream and downstream side depression chambers and both ends of the crossover tube, the communication ports are closed from above, and air is formed in the upper part of the overpass tube. A gate is provided to form a reservoir space, and the front It is characterized by floating supply means to float on water flow of a large plurality of Fushimi Yue transverse tube by supplying a floating body submerged volume space for an air pocket is provided.

  The invention according to claim 7 is the operation device of the sewer overpass structure according to claim 6, wherein the upstream side gate or the downstream side gate as viewed from the inside of the overpass pipe. An introduction chamber for introducing air or / and a floating body into the communication pipe at an upper end of the communication pipe is communicated to at least one of the inner positions with a lower end of the communication pipe for sending air or / and a floating body into the overpass pipe. The outlet of the introduction chamber and the inlet for introducing the floating body into the introduction chamber are provided with a first valve and a second valve for opening and closing the outlet and the inlet, respectively. Is connected to a compressor for feeding high-pressure air into the chamber, and the air supply means is constituted by the communication pipe, the introduction chamber, the first and second valves, and the compressor. Made is, the communicating pipe, introducing chamber, and the first, the floating body supply means by the second valve is characterized by being composed.

  The invention according to claim 8 is the operation device of the sewer underground structure according to claim 7, wherein the upstream gate can be freely opened and closed at the connection port of the upstream bypass chamber and the crossover pipe. A supporting frame is fixed, and a frame that supports the downstream gate in an openable and closable manner is fixed to the connecting port of the downstream side depression chamber and the overpass pipe, and the upstream gate frame or the downstream side gate is fixed. The lower end of the communication pipe is connected to an air introduction port provided in at least one of the frames of the gate.

  Invention of Claim 9 is a driving | running device of the sewer underground structure of any one of Claims 6-8, Comprising: The said floating body is a thing of a granular form, a lump shape, or a ball shape, and It is characterized in that it can be washed away downstream, can be recovered downstream, or can be lost over time.

  According to the first aspect of the present invention, the floating section of the effective channel can be reduced by floating a large number of floating bodies with a large submerged volume in the portion where the flow velocity is slow, and the flow velocity in that portion can be increased to increase the accumulation of sand or the like. It is possible to prevent or sand that has already accumulated on the bottom to flow downstream.

  According to invention of Claim 2, there can exist the following effect. That is, if there is a part where the depth of the flow path is deeper than others in the middle of the crossover pipe, the flow velocity becomes slow at that part, and sand etc. are likely to accumulate, but the part where the flow speed becomes slow By floating a large number of floating bodies, the effective channel cross section can be reduced, so that the flow velocity of that part can be increased to prevent the accumulation of sand, etc., or the sand already accumulated on the bottom Can be swept away.

  According to invention of Claim 3, there can exist the following effect. In other words, if there is a part where the width of the flow path is wider than others in the middle of the crossover pipe, the flow speed will slow down in that part, and sand etc. will easily accumulate, but in the part where the flow speed has slowed down By floating a large number of floating bodies, the effective channel cross-section can be reduced, so that the flow velocity at that part can be increased to prevent the accumulation of sand, etc., or the sand already accumulated at the bottom to the downstream side. Can be swept away.

  According to the invention of claim 4, an effective water channel in a portion where the water depth is deep in front of the downstream gate, that is, in a portion where the flow velocity is slow, by retaining a large number of floating bodies in front of the downstream gate. The cross section can be reduced. Therefore, it is possible to increase the flow velocity of the portion where the water depth is deep to prevent the accumulation of sand or the like, or to remove the sand or the like already deposited on the bottom to the downstream side.

  According to invention of Claim 5, handling of a floating body is easy and can be implemented simply. As a specific example of the floating body, a rubber, soft or hard plastic ball in which water or weight for enlarging specific gravity is encapsulated can be used. When such a ball-shaped floating body is used, it can be easily recovered by a net, a screen, etc. after flowing downstream, so that it can be economically operated if a reuse cycle is prepared. . In addition, an ice block can be used as a floating body, which saves the trouble of collecting the floating body.

  According to invention of Claim 6, there can exist the following effect. That is, when the flow path in the crossover pipe is inclined downward toward the downstream side, it is accumulated at the bottom of the flow path only by operating the gate and introducing air into the air reservoir space. Sand may not be washed away. In such a case, drive as follows. First, the upstream gate and the downstream gate are closed halfway, and air is introduced into the overpass tube to form an air pocket along the longitudinal direction in the upper part of the overpass tube. Reduce the cross-section of the effective flow path to increase the flow velocity. After operating in such a manner, a large number of floating bodies are supplied from the floating body supply means and floated on the deepened water before the downstream gate. In addition, by lowering the downstream gate to a position further lower than the upstream gate with a water channel secured below the gate, a large number of floating bodies floating on the running water can be Let it stay in front. By doing so, it is possible to reduce the effective channel cross section of the deeper water depth in front of the downstream gate, thereby increasing the flow velocity of the deeper water depth and depositing sand, etc. It is possible to prevent or sand that has already accumulated on the bottom to flow downstream, so that a sufficient cleaning effect can be obtained.

  According to the invention of claim 7, the effect of the invention of claim 6 can be achieved by operating as follows. First, when air is introduced into the overpass pipe by creating a space for storing air by operating the gate, the second valve on the inlet side of the introduction chamber is closed, the first valve on the outlet side is opened, and a compressor is used. Via the introduction chamber, high-pressure air is introduced into the air reservoir space defined by the gate. By doing so, the effective flow path cross section through which sewage flows can be reduced, and the flow velocity can be increased.

  In addition, when it becomes necessary to introduce a floating body into the overpass pipe, (1) firstly close the first valve on the outlet side of the introduction chamber, and (2) next, from the compressor to the introduction chamber. In a state where the introduction of the high-pressure air is stopped, the second valve on the inlet side of the introduction chamber is opened, and the floating body is introduced into the introduction chamber. (3) Thereafter, the second valve on the inlet side of the introduction chamber is closed, high-pressure air from the compressor is introduced into the introduction chamber, and the inside of the introduction chamber is brought to the same pressure as the inside of the overpass pipe. (4) Next, in this state, the first valve on the outlet side of the introduction chamber is opened, and the floating body in the introduction chamber is introduced into the overpass pipe through the communication pipe.

  Since the overpass pipes often range from several tens of meters to several hundreds of meters, in actual work, the above floating body throwing operation, that is, by repeating the operations (1) to (4), A necessary and sufficient amount of floating body is introduced into the transverse pipe. Thereby, the cross section of the effective water channel in the deepened part of the water before the downstream gate can be reduced. Therefore, it is possible to increase the flow velocity in the deep water part to prevent the accumulation of sand or the like, or to allow the sand already accumulated on the bottom to flow downstream and to obtain a sufficient cleaning effect. be able to.

  According to the invention of claim 8, since the lower end of the communication pipe for introducing air or / and a floating body is connected to the air introduction port of the frame that supports the gate so as to be freely opened and closed, A communication pipe for introducing a floating body and an introduction chamber with a valve thereon can be installed. Therefore, necessary equipment can be made while controlling costs.

  According to invention of Claim 9, handling of a floating body is easy and can be implemented simply. As a specific example of the floating body, a rubber, soft or hard plastic ball in which water or weight for enlarging specific gravity is encapsulated can be used. When such a ball-shaped floating body is used, it can be easily recovered by a net, a screen, etc. after flowing downstream, so that it can be economically operated if a reuse cycle is prepared. . In addition, an ice block can be used as a floating body, which saves the trouble of collecting the floating body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating a schematic configuration of a sewer emplacement system including an operation device according to an embodiment.
In this system, the upstream sewage channel 1 and the downstream sewage channel 2 are provided on the upstream side and the downstream side with the obstacle 3 in between. On both sides, an upstream side cover room 11 and a downstream side cover room 12 are provided vertically. And the lower end of both the overpass rooms 11 and 12 provided perpendicularly is connected by the overpass pipe 13 which let the underside of the obstacle 3 pass. In this case, the flow path in the overpass pipe 13 is inclined downward from the upstream side toward the downstream side.

In addition, gates 17 and 18 for closing the communication ports 15 and 16 from the upper side are provided at the communication ports 15 and 16 at both ends of the chambers 11 and 12 and the crossing tube 13 so as to be movable up and down. The gates 17 and 18 can be opened and closed by a drive mechanism (not shown). When the two gates 17 and 18 are closed to some extent, an air storage space P (hereinafter referred to as an air cushion chamber) P can be formed in the upper part of the crossover pipe 13, and an external compressor can be formed in this space P. (One element of the air supply means 50) By introducing and containing air from the communication pipe 40 from the 51, the effective flow section of the sewage in the overpass pipe 13 can be reduced and the flow can be accelerated. Here, the two gates 17 and 18 serve as air holding means for forming an air reservoir along the longitudinal direction in the upper part of the overpass pipe 13 by the air supplied from the compressor 51.

  As shown in the example of the downstream side in FIG. 2, each gate 17, 18 is supported by a frame 60 fixed to each connection port 15, 16 so as to be opened and closed (movable up and down). The frame 60 is located on the inner side of the gates 17 and 18 when viewed from the inside of the overpass pipe 13, and the upper side of at least one of the frame 60 of the upstream gate 17 or the frame 60 of the downstream gate 18. The part is provided with an air introduction port 62 for introducing air into the space P for storing air. The air inlet 62 is connected to the lower end of the communication pipe 40 extending vertically upward. 2 shows an example in which the air introduction port 62 and the communication pipe 40 are provided on the downstream side of the overpass pipe 13, the air introduction port 62 and the communication pipe 40 may be provided on the upstream side. When the length of the overpass pipe 13 is very long, the air inlet 62 and the communication pipe 40 may be provided on both the upstream side and the downstream side.

  Further, in addition to the above equipment, a floating body supply means 70 is provided that can supply a large number of floating bodies F with a large submerged volume to the air pool space (air cushion chamber) P as required. ing. The floating body F sent from the floating body supply means 70 to the air cushion chamber P floats on the flowing water in the overpass pipe 13 and stays in front of the downstream gate 18 which is closed to some extent by the flow of sewage. become. Further, a floating body collecting means 74 that collects the used floating body F that has flowed is provided downstream of the overpass pipe 13. The floating body F used here has the property of reliably floating near the surface of the sewage, and it is optimal to set the specific gravity so as to increase the volume of the submerged portion as much as possible.

  An outlet 71 a of an introduction chamber 71 that introduces air or / and a floating body F into the communication pipe 40 is connected to the upper end of the communication pipe 40. The introduction chamber 71 is formed in such a size that a large number of floating bodies F can be introduced and temporarily stored. The outlet 71a of the introduction chamber 71 and the inlet 71b into which the floating body F is introduced into the introduction chamber 71 are A first valve V1 and a second valve V2 that open and close the outlet 71a and the inlet 71b are provided, respectively. The compressor 51 for feeding high-pressure air into the introduction chamber 71 is connected to the introduction chamber 71 via a third valve V3. Further, a storage container 72 capable of storing a large number of floating bodies F is connected to the inlet 71b of the introduction chamber 71, and the floating bodies F recovered by the floating body recovery means 74 are sequentially supplied to the storage containers 72. It has become.

  Here, generally, the air supply means 50 is constituted by the communication pipe 40, the introduction chamber 71, the first, second, and third valves V1, V2, and V3, and the compressor 51, and the communication pipe 40, the introduction A floating body supply means 70 is configured by the chamber 71, the storage container 72, and the first and second valves V1 and V2.

Next, the operation method of this Futsuetsu system will be described.
When operating this subsidence system, normally, the gates 17 and 18 are fully opened, and the flow passage cross section of the subsidence crossing pipe 13 is used to flow sewage. When the cross section of the flow path is largely used, the flow becomes loose, so that deposits may accumulate in the overpass pipe 13.

Therefore, the deposit removal operation is performed at an appropriate timing. During the deposit removal operation, the gates 17 and 18 are closed to some extent. Then, air is introduced from the compressor 51 into an air cushion chamber (air pool space) P formed in the upper part of the overpass pipe 13 thereby. In that case, the compressor 51 is driven in a state in which the first valve V1 and the third valve V3 are opened and the second valve V2 is closed, so that air is introduced into the air cushion chamber P via the introduction chamber 71 and the communication pipe 40. Is introduced. And by holding gates 17 and 18 halfway closed, the air cushion chamber P retains an air reservoir, thereby reducing the cross section through which the sewage flows in the overpass pipe 13 and increasing the flow of sewage. Is pushed downstream. By operating in this way, it becomes possible to reduce the burden of cleaning in the overpass pipe 13.

  Further, it is possible to operate so that deposits do not accumulate in the overpass pipe 13 in advance by switching between rainy weather and sunny weather when the amount of sewage is different. That is, when the amount of sewage is fine, when the entire cross-section of the cross-over tube 13 is opened, the flow rate becomes slow and deposits are likely to accumulate. Therefore, the gates 17 and 18 are closed to an appropriate degree of opening. By confining the air in the transverse tube 13, the cross section through which the sewage flows is reduced and the flow is made faster. By doing so, it is possible to make it difficult for deposits to accumulate in the overpass pipe 13. Further, when the amount of sewage increases during rainy weather, the air sealed during fine weather is removed and the gates 17 and 18 are fully opened so that a large amount of sewage can flow.

  By the way, when the gates 17 and 18 are closed to some extent as described above, air is introduced into the air cushion chamber P, and the sediment removal operation or the sunny weather operation is performed, the water channel in the overpass pipe 13 descends. Due to the inclined relationship, the water depth may become deeper in the downstream portion in the overpass pipe 13 and the flow velocity may become slower. This cannot be solved even if the upstream gate 17 and the downstream gate 18 have the same opening. That is, even if the openings of the two gates 17 and 18 are set in the same manner and the water depths d1 and d2 of the inlet and outlet of the overpass pipe 13 are aligned, only the flow velocity of the inlet and outlet is increased. And since the water depth D of the intermediate part of a water channel is still deep, the flow velocity of the deep part of the water depth is still a slow state. In particular, since the depth of water is deepest in front of the gate 18 on the downstream side, the flow velocity is slow, and as a result, sand or the like is likely to accumulate in that portion.

  Therefore, in such a case, an operation is performed in which water flows while floating a large number of floating bodies F in a portion where the water depth is deeper before the gate 18 on the downstream side. When supplying the floating body F into the overpass pipe 13, the following operation is performed.

(1) First, the first valve V1 on the outlet side of the introduction chamber 71 is closed.
(2) Next, the introduction of the high-pressure air from the compressor 51 to the introduction chamber 71 is stopped by closing the third valve V3 and stopping the operation of the compressor 51. In this state, the second valve V <b> 2 on the inlet side of the introduction chamber 71 is opened, and the floating body F is introduced into the introduction chamber 71 from the storage container 72.
(3) Thereafter, the second valve V2 on the inlet side of the introduction chamber 71 is closed and the third valve V3 is opened, and the compressor 51 is activated to introduce high-pressure air from the compressor 51 into the introduction chamber 71. The inside of the introduction chamber 71 is set to the same pressure as the inside of the overpass pipe 13.
(4) Next, in this state, the first valve V1 on the outlet side of the introduction chamber 71 is opened, so that the floating body F in the introduction chamber 71 is introduced into the overpass pipe 13 through the communication pipe 40 by gravity.

  Since many of the overpass pipes 13 range from several tens of meters to several hundreds of meters, in actual work, by repeatedly performing the above-mentioned floating body F loading operations (1) to (4), the overpass pipe A necessary amount of the floating body F is introduced into 13.

  Further, by lowering the downstream side gate 18 to a position further lower than the upstream side gate 17 with a water channel secured below the large number of floating bodies supplied to the air cushion chamber P. F is allowed to stay in front of the gate 18 so as not to flow out into the downstream passover chamber 12.

By doing in this way, the substantial water depth D1 of the part where the water depth before the gate 18 of the downstream side is deep can be made shallow, and an effective water channel cross section can be made small. As a result, it is possible to increase the flow velocity of the deepened part of the water to prevent the accumulation of sand, etc., or to remove the sand already accumulated on the bottom to the downstream side, thereby obtaining a sufficient cleaning effect. it can.

  And if the operation | movement which floated the floating body F as mentioned above is complete | finished, the gates 17 and 18 of an upstream side and a downstream will be open | released. Then, the gate 18 that has been dammed is eliminated, and the floating body F can be flowed into the downstream side overpassage chamber 12. Therefore, for example, if a net, a screen, or the like is installed at an appropriate position on the downstream side, the floating body F can be collected, and the floating body F can be transferred to the supply device 70 again and used in a circulating manner.

  In addition, according to the present embodiment, the lower end of the communication pipe 40 for introducing air or / and the floating body F is connected to the air introduction port 62 of the frame 60 that supports the gates 17 and 18 so as to be freely opened and closed. As incidental facilities 17 and 18, a communication pipe 40 for introducing air and floating body F and an introduction chamber 71 with a valve thereon can be installed. Therefore, necessary equipment can be made while controlling costs.

  In addition, as the above-mentioned floating body F, a granular shape, a lump shape, or a ball shape can be adopted. Further, as another property, one that can be washed away downstream, one that can be recovered downstream, or one that can be automatically lost over time can be employed.

  As a specific example, it is possible to use a rubber or soft or hard plastic ball encapsulated with water or weight for increasing the specific gravity. If a water-filled rubber ball is used, water can be drained and made small when not in use, which is convenient for storage. Also, a bowling ball (ebonite sphere) or a sponge-like one containing water can be used. The size is not limited as long as it can be passed through the communication pipe 40.

  When such a ball-shaped floating body is used, as described above, it can be easily collected by a net or a screen after flowing downstream, so it is economical if a recycling cycle is prepared. Can drive to. In addition, an ice block of an appropriate size can be used as a floating body. In such a case, the ice lump melts, saving the effort of collecting the floating body. In any case, by using a granular, lump, or ball-like floating body, the handling of the floating body becomes easy and the implementation becomes easy.

  Moreover, in the said embodiment, although the case where the overpass pipe 13 inclined downward was described, in any case where there exists a part whose flow velocity is slower than others in the middle of the overpass pipe 13, this invention. Can be applied. That is, a large number of floating bodies having a large submerged volume are floated in a portion where the flow velocity is slow, and sewage is allowed to flow into the overpass pipe while holding the floating body at that position. By doing so, it is possible to reduce the effective channel cross section of the portion where the flow velocity is slow, and increase the flow velocity of that portion to prevent the accumulation of sand or the like, or the sand already accumulated on the bottom to the downstream side. Can be swept away.

  Examples of the part corresponding to the slow flow rate part include a part where the depth of the channel is deeper than the other part, or a part where the width of the channel is wider than the others.

  In addition, when it is impossible to imagine where there is such a slow flow place in the crossover pipe 13, it is preferable to introduce the floating body F from the vicinity of the upstream gate 17. Then, as the floating body F flows downstream, the effect of increasing the flow velocity at the staying portion is exhibited, so that the downstream flow of sand or the like accumulated on the bottom surface of the overpass pipe 13 can be promoted. .

  Moreover, in the said embodiment, the gates 17 and 18 which can be raised / lowered are provided in the connection ports 15 and 16 of the both ends of the overpass pipe 13, and these gates 17 and 18 are closed to some extent, and thereby the flow of the overpass pipe 13 is flown. In the above description, the air cushion chamber P is formed in the upper portion of the road cross section, and air is introduced into the air cushion chamber P, thereby reducing the substantial flow path cross section of the overpass pipe 13. Instead, an air bag is disposed at each of the communication ports 15 and 16 at both ends of the overpass tube 13, and air is introduced into these air bags as needed to inflate the air bag, thereby allowing the overpass tube to be inflated. The both end communication ports 15 and 16 are closed by a predetermined cross section from the upper side, an air cushion chamber P is formed in the upper part of the flow passage cross section of the overpass pipe 13, and air is introduced into the air cushion chamber P. By doing Even when so as to reduce the substantial channel cross section of the tube 13, the present invention can be applied. In that case, the air bag can be regarded as a gate in a broad sense.

  In addition, instead of a gate or an air bag, elbow pipes with openings facing downward are connected to both end connection ports 15 and 16 of the overpass pipe 13 and air is passed into the overpass pipe 13 as necessary. Even when the substantial flow path cross section of the overpass pipe 13 is reduced by introducing air into the upper air cushion chamber P in the flow path cross section of the overpass pipe 13. The present invention can be applied.

  Moreover, although the case where air and the floating body F were separately introduced into the overpass pipe 13 was described in the above embodiment, the air and the floating body F may be introduced into the overpass pipe 13 at the same time.

It is sectional drawing which shows schematic structure of the sewer emplacement system containing the operating device of embodiment of this invention. It is principal part sectional drawing which shows the example of the path | route for supplying air or / and a floating body. It is a figure of the overpass part structure incorporating the conventional air cushion siphon system, (a) is a normal state, (b) is a figure which shows the state at the time of cleaning. It is a schematic sectional side view of the depression structure for demonstrating the conventional problem.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upstream sewage channel 2 Downstream sewage channel 3 Obstacle 11 Upstream side overpassage 12 Downstream side overpassage 13 Penetration crossing pipe 15,16 Contact port 17,18 Gate (air holding means)
40 communication pipe 50 air supply means 51 compressor 60 frame 62 air introduction port 70 floating body supply means 71 introduction chamber 71a outlet 71b inlet V1 first valve V2 second valve F floating body

Claims (9)

An upstream and downstream depression chamber connected to an upstream sewage channel and a downstream sewage channel arranged with an obstacle therebetween and extending below the obstacle, and below the obstacle In the overpass structure of the sewer system comprising the overpass pipe connecting the lower ends of the upstream side and the downstream side overpass rooms,
Floating a large number of floating bodies with a large submerged volume in a portion of the flowing water inside the overpass pipe where the flow velocity is slower than the others, and flowing the sewage into the overpass pipe while holding the floating body in that position. The operation method of the seductive structure of the sewer. The operation method of the sewer underground structure according to claim 1,
An operation method of a sewer underground structure according to claim 1, wherein there is a part where the depth of the flow path is deeper than others in the middle of the crossover pipe, and the part corresponds to a part where the flow velocity is slow. The operation method of the sewer underground structure according to claim 1,
An operation method of a sewer underground structure, characterized in that there is a part where the width of the flow path is wider than others in the middle of the crossover pipe, and the part corresponds to a part where the flow velocity is slow. The operation method of the sewer underground structure according to claim 1,
When the flow path in the crossover pipe is inclined downward from the upstream side toward the downstream side,
Air supply means for introducing air into the overpass pipe, and air holding means for reducing the cross section through which the sewage flows by forming an air reservoir along the longitudinal direction in the upper part of the overpass pipe by the introduced air. Provided,
As the air retaining means, the communication ports for the upstream and downstream side depression chambers and both ends of the overpass tube are closed from above, and the air is stored in the upper part of the overpass tube. Provided a gate to form a space of
By closing the upstream gate and the downstream gate to a middle position and introducing air into the overpass tube, an air pocket along the longitudinal direction is formed in the upper portion of the overpass tube, When the cross section of the flow path through which the sewage flows is reduced, the deepened portion in front of the downstream gate corresponds to the slow flow rate portion, and the deep water in front of the downstream gate becomes deeper. The large number of floating bodies are floated on the portion, and the downstream gate is lowered to a position further lower than the upstream gate in a state where a water channel is secured below the gate. Is retained in front of the downstream gate, and sewage is allowed to flow in this state. It is a driving | running method of the subsidence structure of the sewer of any one of Claims 1-4,
The floating body is in the form of particles, lumps, or balls, and can be washed away downstream, can be recovered downstream, or can be lost over time. The operation method of the sewer underground structure characterized by this. An upstream and downstream depression chamber connected to an upstream sewage channel and a downstream sewage channel arranged with an obstacle therebetween and extending below the obstacle, and below the obstacle In the overpass structure of the sewer system comprising the overpass pipe connecting the lower ends of the upstream side and the downstream side overpass rooms,
Air supply means for introducing air into the overpass pipe, and air holding means for reducing the cross section through which the sewage flows by forming an air reservoir along the longitudinal direction in the upper part of the overpass pipe by the introduced air. Is provided,
As the air retaining means, each communication port between the upstream side and downstream side depression chambers and both ends of the overpass tube is closed from above, and an air reservoir is provided in the upper part of the overpass tube. A gate is formed to form a space;
Further, a floating body supply means is provided for supplying a large number of floating bodies having a large submerged volume to the space for storing air and floating on the flowing water in the overpass pipe. apparatus. It is a driving | running device of the sewer underground structure of Claim 6,
The lower end of the communication pipe that feeds air or / and a floating body into at least one of the position inside the upstream gate or the position inside the downstream gate when viewed from the inside of the overpass pipe Communicated,
An outlet of an introduction chamber for introducing air or / and a floating body into the communication pipe is connected to an upper end of the communication pipe,
A first valve and a second valve for opening and closing the outlet and the inlet are respectively provided at an outlet of the introduction chamber and an inlet for introducing the floating body into the introduction chamber.
Further, the introduction chamber is connected with a compressor for sending high-pressure air into the chamber.
The air supply means is constituted by the communication pipe, the introduction chamber, the first and second valves, and the compressor,
An operating device for a sewer underground structure, wherein the floating body supply means is constituted by the communication pipe, the introduction chamber, and the first and second valves. It is a driving | running device of the sewer underground structure of Claim 7,
A frame that supports the upstream gate in an openable and closable manner is fixed to a connection port between the upstream side depression chamber and the overpass tube, and the downstream side is connected to the downstream port and the connection port between the overpass tube. A frame that supports the side gate in an openable / closable manner is fixed, and a lower end of the communication pipe is connected to an air introduction port provided in at least one of the upstream gate frame or the downstream gate frame. An operating device with a sewer-passover structure characterized by It is a driving | running device of the subsidence structure of the sewer of any one of Claims 6-8,
The floating body is in the form of particles, lumps, or balls, and can be washed away downstream, can be recovered downstream, or can be lost over time. An operating device of a sewer-passover structure characterized by that.

Images