JP4098310B2 - Vertical soil removal method and equipment for propulsion method, etc. - Google Patents

Description

  The present invention relates to a soil removal method and apparatus for discharging muddy water and the like from a construction site to a high place above ground or the like during various underground works by a propulsion method or the like.

  In tunnel construction such as sewerage, subway, and joint ditch using the propulsion method, as shown in Fig. 13, the bearing shaft 2 and the main push jack 3 are provided in the starting shaft 1, and the cutter 4 is provided at the tip. The pipes (fume pipes) 5 are excavated from the vertical shaft 1, and among the propulsion methods, the mud concentration type propulsion method uses the vertical shaft 1 to remove the high-concentration mud water (drainage mud) excavated during the excavation. Discharged through.

  This drainage is performed by applying a negative pressure by the vacuum device 6 installed on the ground. Solids such as earth and sand and gravel are transported through a horizontal pipe in the form of a plug flow in which water and air are mixed.

  However, in a vertical shaft with a vertical drop of 8 to 10 m or more, the method using only the vacuum pressure in the vacuum device 6 installed on the ground is in principle because the differential pressure between the vacuum pressure and the atmospheric pressure is constant. There is a limit.

  On the other hand, while the shaft depth of the propulsion method becomes deeper, the planar width of the shaft is narrow and a large vacuum pump or tank cannot be installed in the middle (in the middle part of the shaft), and the shaft depth is about 10-20m even in a narrow space. There is a need for soil that can be removed even though it does not affect the efficiency of horizontal soil removal.

  As a current measure, when the depth is 8m or more, the number of air pumps that were good with one vacuum pump at 8m or less was increased to 2 to 3 units. The soil is forcibly discharged due to the effect. At this time, the atmosphere is guided to improve the effect in the vicinity where the drainage pipe bends in the vertical direction from the horizontal part under the shaft (jet type). However, even if these methods are used, about 12 m is practically used. It is the limit, and even if it sees in the electricity bill to be used, it will be 2 to 3 times, and not only the amount of use but also the power receiving / transforming equipment will increase, so it will take time to permit and increase the site for facilities.

  However, even if this is less than 8 m or less, the soil removal efficiency is halved, so that the propulsion and the advancement speed are significantly reduced.

The applicant performs the drainage from the underground construction site where the depth is first through the shaft, but as a high depth drainage system that can be efficiently discharged to the ground without leaving deposits on the way, the following patent document 1 Filed.
Japanese Patent Application No. 2000-141195 (Japanese Patent Laid-Open No. 2001-323775)

  As shown in FIG. 14, a squeeze pump 13 serving as a pumping pump and an evacuation tank 16 having an air reservoir 14 in the upper part and a sediment reservoir 15 in the lower part are provided in the squeeze pump 13 as shown in FIG. The air reservoir 14 of the tank 16 is connected with an air discharge pipe 18 connected to the vacuum device 6 comprising the above-described vacuum pump 6a and the sludge tank 6b, and the water / sediment discharge pipe is connected to the sediment reservoir 15. 19 is connected via a squeeze pump 13. In the figure, 17 is an air + sediment + mud drain pipe, 27 is a mud tank, 26a and 26b are valves, and 19a and 19b are pipes.

  FIG. 12 shows the case of the mud-type propulsion method, in which a main push jack 3 is provided in the starting vertical shaft 1 and a column (fume tube) 5 having a cutter 4 disposed at the tip is advanced from the vertical shaft 1. The high-concentration mud water (drained mud) excavated along with the excavation is discharged through the shaft 1.

  In this way, by providing the squeeze pump 13 as a pressure pump in the middle of the shaft 1, the pump pressure can be used to transport the waste mud to the ground at a high place, and the air, water, and earth sent to the tank 16 The air is separated into the upper air reservoir, the water and sediment are separated into the lower sediment reservoir, the air in the air reservoir is sucked into the vacuum device, and the air reservoir is always maintained in a vacuum state. Slag flow or plug flow that is not adversely affected by air can be generated in the water / sediment discharge pipe.

  In Patent Document 1, a squeeze pump 13 as a pumping pump is provided in the middle of the shaft 1, but the squeeze pump has a drawback that it pulsates, and if there is a mixture of pointed gravel (quarry), the tube portion for extrusion breaks. If the gas is mixed, the performance is significantly reduced.

  In addition, an air discharge pipe 18 connected to the vacuum device 6 and a water / sediment discharge pipe 19 from the squeeze pump 13 coexist in the vertical shaft 1, and the narrow vertical shaft 1 becomes narrower.

  The object of the present invention is to eliminate the inconveniences of the conventional example, the soil removal capacity is large, there is no pulsation, the soil removal pressure is stable, soil removal is possible, the mechanism is simple, the maintainability is good, and the point is sharp Even if gravel (quarry) is mixed, it can be stably discharged without damaging the equipment, and since only one pipe to the ground is required, it can be effectively used in the vertical shaft, etc. It is to provide a method and apparatus.

  In order to achieve the above object, the present invention provides a soil removal method in a propulsion method or the like that sends waste mud from an underground construction site to a vacuum device installed on the ground via a vertical shaft as a soil removal method in the vertical direction in the propulsion method or the like. In the vertical shaft in the vertical shaft, a viscous pump that rotates the internal rotor and discharges using the viscous resistance generated between the rotor and the carrier fluid is provided. The gist is to send the mud from the underground construction site to the ground via a shaft.

As a vertical earth removal device in the propulsion method, etc., firstly, as a device used for the earth removal method in the propulsion method etc. that sends the mud from the underground construction site to the vacuum device installed on the ground via the shaft, In the middle of the vertical shaft in the vertical shaft, there was provided a viscous pump that rotated the internal rotor and discharged using the viscous resistance generated between the rotor and the carrier fluid. Second, the viscous pump The gist is that the vacuum device installed on the ground is connected by a suction hose as one flow path, and thirdly, the viscosity pump is provided with a pressure regulating tank in the previous stage.

  According to the first and second aspects of the present invention, there is provided a viscous pump that rotates the internal rotor and discharges using the viscous resistance generated between the rotor and the carrier fluid. It is the one that sends the sludge from the underground construction site to the vacuum device installed on the ground through the shaft with the discharge power, and the head can be calculated based on the forced eddy motion, and the soil discharge capacity is large and pulsates. Since there is no, the pressure of the earth discharge is stable.

  Further, the viscous pump has a simple mechanism and good maintainability, and in the case of a squeeze pump, even if it is mixed with sharp gravel (quarrying) where the tube portion for extrusion is broken, it can be discharged stably.

  Moreover, since the said viscous pump can be connected in multistage, if the number of use is increased, it can respond to any depth.

  Furthermore, since the viscous pump is installed in the middle part of the pipe in the vertical direction, it is possible to suppress excessive pressure applied to the soil discharge pipe, and there is an effect of suppressing clogging of the pipe.

  In addition, when there is air in the piping, the viscous pump normally requires priming water at the start, but there is no mechanism to block the piping by combining this viscous pump and the vacuum device, so the vacuum of the vacuum device An air lift is always performed by a pump, and a separate priming device is not required, and the size can be reduced.

  According to the third aspect of the present invention, in addition to the above action, the viscous pump and the vacuum device installed on the ground are connected by a suction hose as one flow path, so that only one piping to the ground is required. Therefore, effective use in the shaft can be secured.

  According to the fourth aspect of the present invention, in addition to the above action, by providing a pressure adjusting tank (air chamber) in the middle, it does not affect the suction suction in the horizontal direction, and causes the clogging of the soil discharge pipe. It is possible to screen out the large gravel diameter.

  As described above, the earth removal method in the propulsion method of the present invention has a large earth removal capacity, no pulsation, stable earth removal pressure, simple mechanism and good maintainability. Even if sharp gravel (quarry) is mixed, it can be discharged stably without damaging the equipment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a first embodiment of a vertical soil removal method and apparatus in the propulsion method and the like of the present invention, and is a case of the mud concentration type propulsion method as in FIG. 14 showing a conventional example.

  A main push jack 3 is provided on the starting shaft 1 and a column (fume tube) 5 having a cutter 4 disposed at the tip is excavated from the shaft 1, and the high-concentration mud water (drainage) excavated along with the excavation is discharged. Mud) is discharged through the shaft 1. In the figure, 17 is a sludge pipe for horizontal pulling.

  This drainage is performed by applying a negative pressure by a vacuum device 6 comprising a vacuum pump 6a and a drainage tank 6b installed on the ground, but the present invention provides an internal rotor 8 as a pumping pump in the middle of the pipe of the shaft 1. , And a viscous pump 7 that discharges using the viscous resistance generated between the rotor 8 and the carrier fluid is provided. As piping of the shaft 1 connecting the vacuum device 6 and the viscous pump 7, a suction hose 23 as one flow path is used.

  3 and 4 show an example of the viscous pump 7, the shaft 10 of the drive motor 9 is in the pump housing 11, and the shaft 10 is provided with a disk rotor 8.

  The viscous pump 7 is provided with a suction port 12 a and a discharge port 12 b at appropriate positions on the outer peripheral surface of the pump housing 11. As shown in FIG. 4, when the suction port 12a and the discharge port 12b are provided side by side, assuming that the pipe diameter forming the suction port 12a and the discharge port 12b is d, the position of the rotor 8 in the pump housing 11 is The space on the opposite side of the drive motor 9 was made about 2 / 3d.

  On the other hand, as shown in FIG. 6, when the suction port 12a and the discharge port 12b are arranged vertically (up and down), assuming that the pipe diameter forming the suction port 12a and the discharge port 12b is d, the rotor 8 As for the position in the pump housing 11, the space on the opposite side of the drive motor 9 is made about d / 2.

  The surface of the rotor 8 is preferably a rough surface in order to increase the viscous resistance generated between the rotor 8 and the transport fluid. However, the rough surface is formed by dotted small protrusions although illustration is omitted. It is assumed that the surface is provided with a textured surface, corrugated shape, corrugated shape, lattice, or other uneven shape.

  This viscous pump 7 is an improved type of cascade pump, and conveys it using the characteristics of fluid (Bernoulli's theorem) and viscosity. While a general cascade pump calculates a lift based on natural vortex motion, this viscous pump 7 calculates a lift based on forced vortex motion.

  The use in the viscous pump 7 includes sand, gravel, pebbles, etc. in the fluid to be drained. Therefore, unlike the cascade pump having blades, the uneven shape is used for the rotor 8 to suppress cavitation and prevent damage to the rotor. It acts as a substitute for cascade pump blades.

  Thus, the viscous pump 7 can be used in a range where cavitation does not occur in the rotor 8. Further, the rotation speed of the rotor 8 is rotated at the inner peripheral speed or higher than the speed of the carrier fluid.

  A pressure regulating tank 20 was connected to the inflow side of the viscous pump 7. Since the pressure adjusting tank 20 is guided from the cutter chamber of the cutter 4 as an underground construction site, the mud pipe 17 is connected to the air reservoir 21 and opened. The air reservoir 21 was formed so as to occupy about 1/3 to 1/2 from the top of the pressure regulating tank 20.

  The sediment reservoir 22 of the pressure regulating tank 20 is formed so as to occupy about 1/2 to 2/3 from the bottom of the pressure regulating tank 20. The bottom portion of the pressure adjusting tank 20 is not a funnel shape but a flat surface in order to provide the sediment reservoir 22. FIG. 11 shows the details. The relationship between the connection pipe 17a of the mud pipe 17 and the connection pipe 23a of the suction hose 23 to the viscous pump 7 is as follows. The insertion length of the hose connection pipe 23a from above into the pressure regulating tank 20 is 2/3 to 1 / 3H = h, and the height of the upper part of the mud pipe connection pipe 17a is about 1 / 2h. is there. Further, the tip of the connection pipe 23a of the suction hose is sharpened to form an elliptical opening.

  In this way, by providing the pressure regulating tank 20 (air chamber) in the middle, the large gravel diameter (tube diameter D / 2) that does not affect the suction suction in the horizontal direction and causes the clogging of the soil discharge pipe is also possible. It is possible to screen out here.

  Moreover, in the earth and sand reservoir 22, although not shown in the figure, a cleaning opening is provided in a part (usually a mekra lid), and the inside of the pressure regulating tank 20 is periodically cleaned to remove accumulated gravel. Increases effectiveness.

  In addition, the pressure adjusting tank 20 is provided with an open / close valve for introducing outside air at the bottom of the tank so that air lift can be performed in an emergency, and the outside air is guided in an auxiliary manner to stir in the vertical pipe or tank. Prevent clogging.

  Thus, by providing the viscous pump 7, the electricity cost of the vacuum pump to be used and the power receiving / transforming equipment are not increased, and the site for the equipment has the same design specifications as the vertical shaft with a depth of 8 m or less. Moreover, since the vertical piping can be discharged as a three-phase flow (air, water, gravel), only one pipe is required, the structure is simple, no troublesome control is required, and failure is not likely to occur.

  Moreover, even if the shaft becomes deep, the soil removal efficiency does not decrease, and the propulsion efficiency does not have to be decreased.

  FIG. 2 shows a second embodiment of the present invention, and the pressure regulating tank is divided into two, a horizontal pressure regulating tank 20a and a vertical pressure regulating tank 20b. As for the connection height of the connection pipe 23a of the suction hose 23 to the vertical pressure regulating tank 20b, when the height of the pressure regulating tank 20b is H, the height of 1/3 to 2 / 3H is accumulated upward. It is preferable to remain as follows. Moreover, you may make it connect the connection pipe 23a of a suction hose from the bottom as shown in FIG.

  FIG. 5 shows a third embodiment of the present invention, and the viscous pump 7 can be installed in multiple stages.

  In this way, the mud discharged from the air, water and earth and sand in the cutter 4 is guided into the pressure regulating tank 20 from the mud pipe 17 and further sent from the pressure regulating tank 20 to the vacuum device 6 via the viscous pump 7. Can do.

  7 to 10 show modified examples of the viscous pump 7. As described above, the viscous pump 7 is a pumping pump that rotates the internal rotor 8 and discharges using the viscous resistance generated between the rotor 8 and the carrier fluid. The shape of the pump housing 11 and the shape of the rotor 8 are not limited as long as the shaft 10 is in the pump housing 11 and the shaft 8 is provided with the disk rotor 8.

  In the example of FIG. 7, when the rotor 8 is formed in a ring shape and the cavity of the pump housing 11 is formed on the outer periphery thereof, in the case of FIGS. 8, 9, and 10, the cavity of the pump housing 11 is formed only on one side of the rotor 8. In the case of FIG. 10, the recess 8a corresponding to the cavity of the pump housing 11 is further formed on the rotor 8 side.

  In the case of FIG. 7, assuming that the pipe diameter forming the suction port 12a and the discharge port 12b is d, the diameter of the cavity of the pump housing 11 on the outer periphery of the rotor 8 is d / 2 or more. The ring-shaped rotor 8 may be formed with a rotating plate 8b as a flange, and through holes 8c may be provided at appropriate intervals in the rotating plate 8b. In the illustrated example, the through-hole 8c is rectangular, but it may be circular or the like, and there may be a plurality of sizes.

  Also in the example of FIG. 8, the diameter of the cavity of the pump housing 11 is d / 2 or more. In the example of FIG. 9, the diameter of the cavity of the pump housing 11 is d or more. In the example of FIG. 10, the diameter of the cavity of the pump housing 11 is set to d / 2 or more.

  Although the above embodiment demonstrated the soil removal method of three-phase flow (air, water, gravel), this invention is applicable also to conveyance of a general two-phase flow. This is particularly advantageous when the transported solid diameter is large. (Maximum transport diameter on design = pipe diameter D / 3, practical transport diameter = pipe diameter D / 2)

It is explanatory drawing which shows 1st Embodiment of the earth removal method and apparatus of the vertical direction in the propulsion | construction method etc. of this invention. It is explanatory drawing which shows 2nd Embodiment of the earth removal method and apparatus of the perpendicular direction in the propulsion | construction method etc. of this invention. It is a vertical side view which shows the 1st example of a viscous pump. It is a vertical front view which shows the 1st example of a viscous pump. It is explanatory drawing which shows 3rd Embodiment of the earth removal method and apparatus of the perpendicular direction in the propulsion | construction method etc. of this invention. It is explanatory drawing which shows the 2nd example of a viscous pump. It is explanatory drawing which shows the 3rd example of a viscous pump. It is explanatory drawing which shows the 4th example of a viscous pump. It is explanatory drawing which shows the 5th example of a viscous pump. It is explanatory drawing which shows the 6th example of a viscous pump. It is explanatory drawing of a pressure regulation tank. It is explanatory drawing which shows the other example of the pressure regulating tank for perpendicular | vertical. It is explanatory drawing of a mud type propulsion method. It is explanatory drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vertical shaft 2 ... Supporting wall 3 ... Main pushing jack 4 ... Cutter 5 ... Tube 6 ... Vacuum device 6a ... Vacuum pump 6b ... Waste mud tank 7 ... Viscous pump 8 ... Rotor 8a ... Recess 8b ... Rotating plate 8c ... Through hole 9 ... Drive motor 10 ... Shaft 11 ... Pump housing 12a ... Suction port 12b ... Discharge port 13 ... Squeeze pump 14 ... Air reservoir 15 ... Sediment reservoir 16 ... Tank 17 ... Mud pipe 17a ... Connection pipe 18 of the mud pipe ... Air discharge pipe 19 ... Water / sediment discharge pipes 19a, 19b ... Pipe 20, 20a, 20b ... Pressure control tank 21 ... Air reservoir 22 ... Sediment reservoir 23 ... Suction hose 23a ... Suction hose connection pipe 25a, 25b ... Level switch 26a, 26b ... Valve 27 ... Waste mud tank

Claims (4)

  In the earth removal method in the propulsion method, etc. that sends the mud from the underground construction site to the vacuum device installed on the ground via the shaft, the rotor inside and the transfer fluid are rotated in the vertical pipe in the vertical shaft The propulsion method is characterized by providing a viscous pump that discharges using the viscous resistance generated between the two and pumping the mud from the underground construction site to the ground via the shaft with the discharge force of this viscous pump Method of vertical earth removal in etc.   As a device used for the earth removal method in the propulsion method etc. that sends the mud from the underground construction site to the vacuum device installed above the ground via the vertical shaft, the internal rotor is rotated in the vertical pipe in the vertical shaft, A vertical soil removal apparatus in a propulsion method or the like, characterized in that a viscous pump that discharges using a viscous resistance generated between a rotor and a carrier fluid is provided. The vertical soil removal apparatus in the propulsion method or the like according to claim 2, wherein the viscous pump and the vacuum apparatus installed on the ground are connected by a suction hose as one flow path. The vertical soil removal apparatus in the propulsion method or the like according to claim 2 or 3, wherein the viscous pump is provided with a pressure adjusting tank in a previous stage.

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