JP6049406B2 - Cleaning method and cleaning system for the Fushie pipeline - Google Patents

Description

  The present invention relates to a cleaning method and a cleaning system for an underground passage for detouring an obstacle such as a river or an underground structure.

  When a groundwater channel is passed through a place where there is an obstacle such as a river or an underground structure, a groundwater channel generally called a subway channel is constructed. The overpass pipe usually has an upstream side shaft and a downstream side shaft buried in the hanging direction on both sides of the obstacle, and an overpass pipe connecting the both at the bottom. In such a depression structure, water flows down from the upstream side to the downstream side due to the difference in water level between the upstream side and the downstream side.

  By the way, in general, existing pipes such as sewage pipes need to be cleaned at regular intervals because foreign substances adhere to the inner surface of the pipe over time. In particular, the passage is always full in the passage, and when the water flow in the passage becomes slow due to weather conditions, solids or foreign matter settles on the bottom of the tube and stays there. Therefore, there is a great need for cleaning.

  In recent years, a cleaning method using a sherbet-like fluid (Patent Document 1) has attracted attention as a cleaning method for existing pipes. In this method, a sherbet-like fluid formed of small ice particles and water is used, this fluid is fed into the pipeline from the inlet of the pipeline, and the sherbet-like fluid flows from the outlet of the pipeline. The fluid is discharged. When ice particles constituting the fluid flow in the pipe, deposits (scale) such as red rust adhering to the inner wall of the pipe are scraped off, and the pipe is cleaned. The sherbet-like fluid is of interest because it is formed only with ice particles and water, which is a melt of the ice particles, and is harmless to the environment.

Special table 2003-519571 gazette

  The cleaning method using the fluid as described above is a technique in which the end portion of the pipe line or the vicinity thereof is sealed and the sherbet-like fluid is sent. The connected shaft is several times deeper than a normal manhole, and it is difficult for an operator to enter the bottom of the shaft and use it for sealing or cleaning at the end of the overpass pipe or in the vicinity thereof. Moreover, in the washing | cleaning method using a fluid, it is desirable to suppress the quantity of the fluid used as much as possible from the point of expense or workability | operativity.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cleaning method and a cleaning system for a depression passage that uses a sherbet-like fluid in the smallest possible amount to wash the depression passage. It is to provide.

In order to solve the above-described object, a method for cleaning a subway conduit according to claim 1 is:
An upstream shaft that connects the upstream shaft connected to the upstream conduit and the downstream shaft connected to the downstream conduit at a lower position than the two conduits, the upstream shaft, In the washing method of the overpass pipe which is washed in a state where water is retained in the downstream side shaft and the overpass pipe,
(A) A sealed region forming step in which a sealing member is installed at a position below the pipe line connected to the shaft of one of the shafts, and a region below the sealing member is a sealed region; and (B) The sorbet-like fluid is introduced under pressure into the sealed region, and the introduced fluid is filled in the connecting portion between the overpass pipe and the one shaft, and the introduction of pressure is continuously performed to A fluid feeding step of feeding the fluid toward the other shaft in the overpass.

  According to this configuration, the connecting portion between the overpass pipe and one of the vertical shafts is filled with a sherbet-like fluid, and the fluid is further introduced under pressure to feed the fluid through the overpass. As a result, foreign matter in the overpass conduit is taken in and removed by the fluid, and the inside of the overpass conduit is cleaned. In addition, the sealing member used to form the sealed area may be installed at a position below the upstream pipeline or the downstream pipeline at a depth relatively close to the ground. Installation work can be performed in a range. Furthermore, since the sealing member is installed in the shaft, the fluid can be sent in the overpass pipe without introducing the fluid into the entire region of the shaft. It becomes possible to reduce the amount of body to a small amount.

The method for cleaning the passage of claim 2 is as follows:
(C) It further includes a discharge step of discharging the staying water and / or the fluid from the other shaft side. According to this configuration, the pressure required to pressurize and introduce the fluid is reduced, and the fluid can be smoothly fed in the overpass conduit.

The method for cleaning the passage of Claim 3 is as follows:
Filling the fluid is performed by supplying compressed gas into the sealed region to lower the upper end position of the staying water and / or fluid in the sealed region. According to this configuration, even when the fluid has a specific gravity lower than that of water, the fluid can be filled in the connection portion between the overpass pipe and the one of the vertical shafts in the sealed region where the accumulated water exists. it can. Since the compressed gas layer is on the upper side and the fluid and / or the staying water layer is on the lower side in the sealed region, it is not necessary to introduce the fluid into the entire region in the sealed region in the shaft buried deep in the ground. It is possible to further reduce the amount of fluid used in the process.

The method for cleaning the passage of Claim 4 is as follows:
An inflatable bag body and a plate body are arranged in this order below the sealing member, and fluid is supplied to the inflatable bag body to inflate the bag body to move the plate body downward. Then, the fluid is filled in the connecting portion by lowering the upper end position of the staying water and / or the fluid downward. According to this configuration, similarly to the effect of the third aspect, even when the fluid has a specific gravity lower than that of water, the fluid can be filled in the connection portion in the sealed region where the staying water exists. it can. Similarly, since it is not necessary to introduce the fluid throughout the sealed region, the amount of fluid used for cleaning can be further reduced.

The method for cleaning the subway pipeline according to claim 5 is:
The sherbet-like fluid has a specific gravity higher than that of water. According to this configuration, the fluid can be filled in the connecting portion as it is simply by introducing the fluid into the sealed region where water is retained. In addition, since the stagnant water layer is on the upper side and the fluid layer is on the lower side in the sealed region, it is not necessary to introduce the fluid into the entire sealed region in the shaft buried deep in the ground, and the fluid used for cleaning This amount can be further reduced.

The flushing system for a bypass passage according to claim 6 is:
An upstream shaft that connects the upstream shaft connected to the upstream conduit and the downstream shaft connected to the downstream conduit at a lower position than the two conduits, the upstream shaft, In the washing system of the overpass pipe which is washed in a state where water is retained in the downstream side shaft and the overpass pipe,
A sealing region forming means for setting a sealing member at a position below the pipe line connected to the shaft of one of the shafts and setting a region below the sealing member as a sealing region, and a sherbet-like shape in the sealing region Fluid pressurizing and introducing means for pressurizing and introducing the fluid. According to this structure, the same effect as that of the first aspect can be obtained.

The flushing system for a bypass passage according to claim 7,
It further has a discharge means for discharging stagnant water and / or the fluid from the other shaft side. According to this structure, the same effect as that of the second aspect can be obtained.

The flushing system for a bypass passage according to claim 8,
It has a compressed gas supply means for supplying a compressed gas into the sealed area. According to this structure, the same effect as that of the third aspect can be obtained.

The cleaning system for a passover pipe according to claim 9 is:
An inflatable bag and a plate are arranged in this order below the sealing member, and fluid supply means for supplying fluid to the inflatable bag is provided. According to this structure, the same effect as that of the fourth aspect can be obtained.

The flushing system for a bypass passage according to claim 10,
The sherbet-like fluid has a specific gravity higher than that of water. According to this structure, the same effect as that of claim 5 can be obtained.

  According to the cleaning method and the cleaning system for a subsidence pipe according to the present invention, even if the pipe has a subsidence structure that is buried deep in the ground and does not allow an operator to enter, it uses a sherbet-like fluid. The inside of the pipeline can be cleaned. Further, in the present invention, it is possible to wash the overpass line with as little fluid as possible.

It is explanatory drawing which shows the operation | work which forms an airtight area | region. It is explanatory drawing which shows a mode that a fluid is introduced in 1st Embodiment. It is explanatory drawing which shows a mode that a fluid is sent in 1st Embodiment. It is explanatory drawing which shows the mode of the introduction of the fluid in 2nd Embodiment, and the introduction of compressed gas. It is explanatory drawing which shows a mode that a fluid is sent by 2nd Embodiment. It is explanatory drawing which shows the mode of the introduction of a fluid in 3rd Embodiment. It is explanatory drawing which shows the cover structure before washing | cleaning.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 7 is a schematic view for explaining the underground structure of the sewer before the cleaning method according to the present invention is performed.

  The illustrated surpass structure includes an upstream shaft 74 connected to the upstream conduit 72 and a downstream shaft 78 connected to the downstream conduit 76. The upstream shaft 74 and the downstream shaft are shown in FIG. 78 is connected to the upstream side pipe line 72 and the downstream side pipe line 76 connected to each other by a bypass pipe line 80 at a position lower than the upstream side pipe line 72 and the downstream side pipe line 76. In the upstream shaft 74, the downstream shaft 78, and the overpass 80, sewage is retained, and foreign matter 81 is attached to the inner surface of the overpass 80. As a preliminary preparation, a packer 90 is arranged in the upstream pipe line 72 to temporarily block the water flow flowing in the pipe line. Even if it is not blocked, it is possible to carry out the present method without stopping the water flow by providing a temporary flow path that leads from the upstream line 72 to the downstream line 76.

The method for cleaning the passage of the present invention is as follows:
(A) A sealing member is installed at a position lower than a pipe line (downstream pipe line 76) connected to the vertical shaft of one of the vertical shafts (downstream side shaft 78), and a region below the sealing member is sealed. And (B) pressurizing and introducing a sherbet-like fluid into the sealed region, and connecting the introduced fluid to the overpass pipe 80 and one shaft (downstream shaft 78). A fluid feeding step in which the fluid is fed into the section and the fluid is fed toward the other shaft (upstream shaft 74) by continuously performing the pressure introduction and passing the fluid toward the other shaft (upstream shaft 74). Hereinafter, each step will be described in detail.

<First Embodiment>
FIG. 1 is a schematic view showing the state of step (A). In the step (A), the sealing member 14 is installed at a position below the pipe 76 connected to the shaft 78 in the downstream shaft 78 which is one of the shafts, and a region below the sealing member 14 is formed. A sealed region 12 is assumed.

  In the present embodiment, the sealing region 12 is formed by installing the sealing member 14 in a position lower than the downstream pipe line 76 in the downstream shaft 78. The sealing member 14 is composed of a plate-like member, and the installation is performed as follows. That is, a plurality of steps 16 are driven into the inner wall of the downstream shaft 78 at the same height position at predetermined intervals in the circumferential direction. Then, a plate-like sealing member 14 having a shape and an area substantially the same as or slightly smaller than the transverse cross-sectional opening of the downstream shaft 78 is placed on the plurality of steps 16. In this state, the clearance between the sealing member 14 and the inner surface of the downstream shaft 78 is closed with a sealing material (not shown) such as packing. Next, the sealing member 14 is driven by driving a fixing member 18 such as a pile into the inner wall of the downstream shaft 78 on the sealing member 14 or by fitting an annular rigid belt (not shown) along the periphery of the inner wall of the downstream shaft 78. To fix. Thereby, the area below the sealing member 14 becomes the sealed area 12. When the sealing member 14 is installed, the staying water staying in the shaft 78 may be drained as necessary. In the illustrated example, the sealing member 14 is installed in the water without draining the accumulated water.

  Next, steps (B) and (C) will be described. 2 and 3 show the states of steps (B) and (C). In the step (B), the sherbet-like fluid 20 is introduced into the sealed region 12 under pressure, and the fluid 20 is filled into the connecting portion 82 between the overpass pipe 80 and the downstream shaft 78, and further introduced under pressure. Are continuously carried out to feed the fluid 20 toward the upstream shaft 74 in the underground pipe 80. Moreover, in a process (C), stagnant water and / or the fluid 20 are discharged | emitted from the upstream shaft 74 side which is the other shaft. Step (C) is performed as necessary.

  The present embodiment shows an example in which a fluid having a specific gravity higher than that of water is used, and the fluid introduction is performed such that the discharge port 26a is positioned in the vicinity of the downstream shaft 78 end portion of the overpass pipe 80. When the fluid 20 is introduced from the pipe 26, the fluid 20 sinks downward in the stagnant water and fills the connection portion 82 between the overpass pipe 80 and the downstream shaft 78. As a fluid having a higher specific gravity than water, particles having a higher specific gravity than water (for example, metal particles such as iron particles or plastic particles) are mixed with water, and the mixture is frozen to form a sorbet or saline. It is possible to use a frozen sherbet. The salt solution is not limited to water in which salt is mixed and dissolved, but also salt water of seawater and salt lakes, and naturally existing salt-containing liquids such as groundwater and hot spring water containing salt. In this case, the concentration may be adjusted by further dissolving sodium chloride in these. Furthermore, you may use the concentrated waste_water | drain with high salt concentration produced in the process of desalinating these naturally existing salt containing water (seawater etc.).

  And in this Embodiment, the two discharge pipes 22 and 24 are provided in the upstream side shaft 74, and the position of each lower end 22a, 24a is arrange | positioned so that it may differ in an up-down direction. The discharge pipe 22 having a higher lower end mainly discharges the accumulated water, and the discharge pipe 24 having a lower lower end mainly discharges the fluid 20. There may be only one discharge pipe.

  The fluid 20 moves in the overpass 80 toward the upstream shaft 74 due to the introduction pressure that introduces the fluid 20 through the fluid introduction pipe 26 under pressure. When the fluid 20 moves in the overpass conduit 80, foreign matter 81 such as sludge in the overpass conduit 80 is taken in and removed by the fluid 20, and the overpass conduit 80 is washed. Further, by discharging the fluid 20 and / or the accumulated water in the step (C), the introduction pressure of the fluid 20 is reduced, and the inside of the overpass conduit 80 can be smoothly fed. The discharge by the discharge pipes 22 and 24 is preferably controlled using a water level sensor or the like so that the water level 51 in the upstream shaft 74 is as low as possible. Thereby, the introduction pressure of the fluid 20 can be maintained at a low level, and the inside of the overpass conduit 80 can be further smoothly fed.

  Further, a flange portion (not shown) that protrudes in a bowl shape from the outer peripheral surface thereof may be provided at or near the discharge port 26a of the fluid introduction pipe 26. By providing the eaves portion, the fluid 20 can be sent through the overpass pipe 80 without flowing the downstream shaft 78 as much as possible, and the working efficiency is improved and the amount of use of the fluid 20 is reduced. Is planned.

  In the cleaning method of the overpass pipe of the present invention, the sealing member 14 used to form the sealed area 12 is installed at a position below the downstream pipe 76 at a depth relatively close to the ground. Since it is good, installation work can be performed within the range that the worker can enter. Further, since the sealing member 14 is installed in the downstream shaft 78, the fluid 20 is sent in the overpass pipe 80 even if the fluid 20 is not introduced into the entire region in the downstream shaft 78. Since it can be made to flow, the amount of the fluid used can be suppressed to a small amount.

  Further, in the present embodiment, the sealed region 12 is formed in a state where the sewage stays in the downstream shaft 78, and in the sealed region 12, the upper side is the retained water layer and the lower side is the fluid 20 layer. 20 can be sent, so that the bypass pipe 80 can be washed with a smaller amount of the fluid 20 without introducing the fluid 20 into the entire region of the sealed region 12.

  In the cleaning method of the present invention, the discharged fluid 20 may be reintroduced into the sealed region 12. Thereby, the usage-amount of the fluid 12 can further be reduced.

<Second Embodiment>
Next, a second embodiment of the cleaning method and the cleaning system of the present invention will be described with reference to FIGS. In this Embodiment, the example using the fluid 40 whose specific gravity is lower than water is shown. As shown in FIG. 4, the fluid 40 having a specific gravity lower than that of water floats upward after being introduced into the sealed region 12. In order to fill the fluid 40 with the connecting portion 82 between the depression pipe 80 and the downstream shaft 78, the following operation is performed. That is, a fluid is introduced into the sealed region 12 by supplying a compressed gas such as compressed air from the compressed gas supply pipe 42 installed so that the discharge port 42 a is positioned in the sealed region 12. Continuing to introduce fluids region of space 44 between the sealing member 1 4 and the upper end position 41 of the fluid 40 (which may include accumulated water) gradually increases, the upper end position 41 of the fluid 40 below Lower (see FIG. 5). As a result, the connecting portion 82 between the overpass pipe 80 and the downstream shaft 78 is filled with the fluid 40, and then the fluid 40 flows in the overpass 80 toward the upstream shaft 74, Cleaning in the passage 80 is performed.

  As the fluid 40 having a specific gravity lower than that of water, water having a sherbet shape can be used. When using a fluid in which water is sorbet-like, it is advantageous in terms of cost, post-treatment and environment.

  In the present embodiment, it is advantageous to maintain the upper end position 41 of the fluid 40 at a position higher than the upper end of the downstream side shaft 78 side end portion of the overpass pipe 80. Thereby, the air of the space 44 can be prevented from flowing into the overpass conduit 80, and the fluid 80 can be continuously sent. This can be achieved by attaching a water level sensor to the compressed gas supply pipe 42 or the like to adjust and control the amount of compressed gas introduced, or by placing a float on the upper end position 41 and a valve linked to the float on the compressed gas supply pipe 42. It is possible to adopt a method of providing a structure in which the valve is closed when the upper end position 41 is lowered from a predetermined position (when the floating position is lowered).

  In the present embodiment, the sealed region 12 is formed in a state where the sewage stays in the downstream shaft 78, and in the sealed region 12, the upper side is the compressed gas 44 layer, the lower side is the fluid 40 layer, and the fluid 40 Since the fluid 40 is not introduced into the entire region of the sealed region 12, the overpass pipe 80 can be washed with a smaller amount of the fluid 40. The present embodiment is the same as the first embodiment except for what has been described above, and a description thereof will be omitted.

<Third Embodiment>
Next, a third embodiment of the cleaning method and cleaning system of the present invention will be described with reference to FIG. This embodiment also shows an example in which a fluid 40 having a specific gravity lower than that of water is used, and the fluid 40 floats upward after being introduced from the fluid introduction pipe 26.

  What is characteristic in the present embodiment is that an inflatable bag body 52 and a plate body 54 are arranged in this order below the sealing member 14, and liquid or the like is supplied from the fluid supply pipe 56 to the inflatable bag body 52. The fluid (for example, water) is supplied to inflate the bag body 52. The plate body 54 is disposed substantially horizontally in an unfixed state, and a rubber bag can be used as the inflatable bag body 52 disposed on the plate body 54. Due to the expansion of the bag body 52, the plate body 54 moves downward to lower the upper end position 41 of the fluid 40 (which may contain stagnant water) downward (in the direction of arrow 100). Thereby, the fluid 40 can be filled in the connection part 82, and it can be made to flow in the upstream side shaft 74 direction afterwards in the inside of the overpass 80. The bag body 52 and the plate body 54 may be separated or connected to each other.

  In the present embodiment, since the fluid layer supplied to the bag body on the upper side and the fluid layer 40 on the lower side can be sent in the sealed region, the fluid 40 can be sent, so the fluid can be supplied to the entire region of the sealed region Without introducing 40, it is possible to clean the overpass 80 with a smaller amount of fluid 40. The present embodiment is the same as the first embodiment except for what has been described above, and a description thereof will be omitted.

  The present invention provides an overpass connecting the upstream shaft connected to the upstream conduit and the downstream shaft connected to the downstream conduit at a position below the both conduits, In the cleaning system of the overpass, which is cleaned in a state where water stays in the upstream shaft, the downstream shaft, and the overpass, below the pipe connected to the shaft of one of the shafts And a fluid pressure introducing means for pressurizing and introducing a sherbet-like fluid into the hermetic region. We also provide an over-pipe cleaning system.

  The sealed region forming means has the sealing member 14 shown in FIG. 1, and the pressurizing and introducing means has the fluid introduction pipe 26 and the introduction pump (not shown) shown in FIG.

  In addition, the cleaning system of the present invention may have a discharge means for discharging the accumulated water and / or the fluid from the other shaft side. The discharge means includes the discharge pipe 22 and / or the discharge pipe 24 and the discharge pump (not shown) shown in FIG.

  Furthermore, the cleaning system of the present invention may have compressed gas supply means for supplying compressed gas into the sealed area. The compressed gas supply means has the compressed gas supply pipe 42 shown in FIG. 4 and a compressor (not shown) connected thereto.

  In the cleaning system of the present invention, as shown in FIG. 6, an inflatable bag body 52 and a plate body 54 are arranged in this order below the sealing member 14, and fluid is supplied to the inflatable bag body 52. You may have the fluid supply means to supply. The fluid supply means includes a fluid supply pipe 56 and a pump (not shown).

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention. In the above-described embodiment, an overslope structure through which sewage flows is shown as an example, but the present invention is applicable not only to sewers but also oversink structures of other pipeline facilities.

12 Sealing region 14 Sealing member 16 Step 18 Fixing member 20 Fluids 22 and 24 Drain pipe 26 Fluid introduction pipe 40 Fluid 42 Compressed gas supply pipe 44 Space 51 Upstream shaft water level 52 Bag body 54 Plate body 56 Fluid supply Pipe 72 Upstream pipe 74 Upstream shaft 76 Downstream pipe 78 Downstream shaft 80 Overpass pipe 81 Foreign material 82 Connection

Claims (10)

An upstream shaft that connects the upstream shaft connected to the upstream conduit and the downstream shaft connected to the downstream conduit at a lower position than the two conduits, the upstream shaft, In the washing method of the overpass pipe which is washed in a state where water is retained in the downstream side shaft and the overpass pipe,
(A) A sealed region forming step in which a sealing member is installed at a position below the pipe line connected to the shaft of one of the shafts, and a region below the sealing member is a sealed region; and (B) The sorbet-like fluid is introduced under pressure into the sealed region, and the introduced fluid is filled in the connecting portion between the overpass pipe and the one shaft, and the introduction of pressure is continuously performed to A fluid feeding step of feeding the fluid into the downpipe pipe toward the other shaft;
For cleaning the Fushie pipeline. (C) a discharging step of discharging the accumulated water and / or the fluid from the other shaft side,
The cleaning method according to claim 1, further comprising:   The filling of the fluid is performed by lowering the upper end position of the staying water and / or fluid in the sealed region by supplying compressed gas into the sealed region. The cleaning method according to 1 or 2.   An inflatable bag body and a plate body are arranged in this order below the sealing member, and fluid is supplied to the inflatable bag body to inflate the bag body to move the plate body downward. The cleaning method according to claim 1, wherein the fluid is filled in the connection portion by lowering the upper end position of the staying water and / or the fluid downward.   The cleaning method according to claim 1, wherein the sherbet-like fluid has a specific gravity higher than that of water. An upstream shaft that connects the upstream shaft connected to the upstream conduit and the downstream shaft connected to the downstream conduit at a lower position than the two conduits, the upstream shaft, In the washing system of the overpass pipe which is washed in a state where water is retained in the downstream side shaft and the overpass pipe,
A sealing region forming means for installing a sealing member at a position below the pipe line connected to the shaft of one of the shafts, and setting a region below the sealing member as a sealed region;
Fluid pressurizing and introducing means for pressurizing and introducing a sherbet-like fluid into the sealed region;
A flushing system for a bypass passage characterized by comprising:   The cleaning system according to claim 6, further comprising discharge means for discharging the accumulated water and / or the fluid from the other shaft side.   The cleaning system according to claim 6 or 7, further comprising compressed gas supply means for supplying compressed gas into the sealed region. Below the sealing member, an inflatable bag and a plate are arranged in this order,
The cleaning system according to claim 6, further comprising a fluid supply unit that supplies fluid to the inflatable bag body.   The cleaning system according to any one of claims 6 to 9, wherein the sherbet-like fluid has a specific gravity higher than that of water.

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