JP5656685B2 - Soft ground improvement device and branch pipe - Google Patents

Description

  The present invention relates to an improvement device and a branch pipe used in a soft ground improvement construction method by vacuum consolidation for compacting soft ground such as landfill with mud.

  Conventionally, as an improvement device for soft ground, by applying a vacuum pressure to the improved ground through a vertical drain material installed at a predetermined interval in the improved ground, it was isolated from the periphery of the improved ground in the improved ground. Some have created a decompression area.

  The improved apparatus shown in FIG. 17 includes a vertical drain material 40 installed at a predetermined interval in the improved ground A, and a horizontal drain material 41 arranged so as to be connected to the upper end portion of each vertical drain material 40. A water collecting pipe 42 connected to the horizontal drain material 41, a sealing sheet 44 for covering the upper surface of the improved ground A together with the vertical drain material 40, the horizontal drain material 41 and the water collecting pipe 42, and a vacuum tank 45 in the water collecting pipe 42. And a vacuum pump 46 connected thereto.

In the improved construction method using the apparatus shown in FIG. 17, when the vacuum pump 46 is operated and the inside of the vacuum tank 45 reaches a predetermined pressure reduction degree by the vacuum pressure from the vacuum pump 46, a pressure reducing check valve (not shown) is provided. The water collecting pipe 42 opened and connected thereto is depressurized. Next, the vacuum pressure propagates to the horizontal drain material 41 connected to the water collecting pipe 42 and the horizontal drain material 41 is depressurized. Further, the vacuum pressure is transmitted to the vertical drain material 40 whose upper end is connected to the horizontal drain material 41, and the inside of the vertical drain material 40 is set to a predetermined vacuum pressure (for example, 0.4 atm or less).
Further, the vacuum pressure in the vertical drain material 40 propagates to the ground A around the vertical drain material 40, and the ground around the vertical drain material 40 is defined as a decompressed region (hereinafter referred to as a decompressed region).

  The vacuum pressure propagates from the ground around the vertical drain material 40 that has become the decompression region to the ground around the outside, and as a result, the ground pressure (water pressure, earth pressure) toward the vertical drain material 40 is increased. Occur.

  In accordance with this ground pressurization, pore water contained in the ground around the vertical drain material 40 is sucked out toward the vertical drain material 40, and drained using the vertical drain material 40, the horizontal drain material 41 and the water collecting pipe 42 as a drainage path, Along with this, the ground around the outside of the ground around the vertical drain material 40 also becomes a decompression region.

  In this way, the decompression area spreads around the vertical drain material 40 and the surrounding ground, and the entire improved ground A eventually becomes the decompression area. At the same time, consolidation and strength increase proceed with the vertical drain material 40 as the center, and the improved ground A The whole area is consolidated and the strength is increased.

Japanese Patent No. 3656217

  By the way, in the conventional improvement apparatus, the vacuum pump 46, the vacuum tank 45, the water collection pipe 42, the horizontal drain material 41, and the vertical drain material 40, which are the propagation paths of the vacuum pressure from the vacuum pump 46, are improved as it is. It becomes the drainage route of the pore water sucked out from.

  For this reason, according to this improved device, the pore water from the improved ground A together with the air in the improved ground A through the vertical drain material 40 and the horizontal drain material 41 in the water collecting pipe 42 at the beginning when the vacuum pressure is applied. A large amount of water flows and fills the water collection pipe 42, and water and air are mixed in the water collection pipe, so that the vacuum pressure from the vacuum pump 46 is not transmitted to the vertical drain material 40 or is difficult to be transmitted. Was significantly inhibited.

  In order to solve such a problem, an improvement device for soft ground in which a drainage tank for separating air and water is provided on the water collecting path of the water collecting pipe 42 has been proposed (see, for example, Patent Document 1). In this type of improved apparatus, the path of the pore water collected through the vertical drain material 40 and the horizontal drain material 41 and the propagation path of the vacuum pressure are the same in the water collection pipe 42 according to gravity. The pore water is separated by flowing into the drain tank. And this improvement apparatus discharges the pore water collected in the drainage tank out of the improvement ground by a pump.

  In this way, the improved apparatus separates the pore water collection path and the vacuum pressure propagation path, which were the same in the water collection pipe 42, by the drain tank. The water collection path and the propagation path of the vacuum pressure are the same.

  On the other hand, if a large number of drainage tanks are installed for a single water collection pipe, it will be necessary to prepare a large number of submersible pumps that discharge pore water in the drainage tank. The man-hour will increase. In addition, since it is efficient to cause the drainage tank to flow into the drainage tank when a certain amount of interstitial water is collected by the plurality of horizontal drain members 41, the drainage tank is installed not at the end of the drainage pipe 42 but at the center of the improved area. Part is desirable.

  That is, when an attempt is made to actually construct this kind of improved device that separates the water collection path of the pore water and the propagation path of the vacuum pressure using the drain tank, the method of installing the drain tank at the end of the water collection pipe 42 is a reality. Not right. However, in this case, at the end position of the water collecting pipe 42, the water collecting path of the pore water and the propagation path of the vacuum pressure are not separated, and the vacuum pressure is applied to the horizontal drain material 41 and the vertical drain material 40 connected to the position. It becomes difficult to transmit and goes against the purpose of uniform ground improvement.

  Therefore, an object of the present invention is to provide a soft ground improvement device and a branch pipe that can drain pore water evenly by reliably transmitting the vacuum pressure to the drain at the end of the water collecting pipe.

  In order to solve the above-described problems, the soft ground improvement device according to the present invention is a soft ground that creates a decompression region isolated from the periphery of the improved ground in the improved ground by applying a vacuum pressure to the improved ground. In the ground improvement device, a plurality of vertical drain members installed at predetermined intervals in the improved ground, a pipe connected to the vertical drain material, and one or a plurality of collection points connected to a water collection path of the pipe. A water tank, a submersible pump for draining the interstitial water collected in the water collecting tank through a drain pipe to a drain tank outside the improved ground, and a vacuum pump for applying a vacuum pressure to the pipe, The pipe communicates with the first pipe part via a first pipe part to which the vacuum pump is connected and a plurality of branch parts provided at a predetermined interval, and the vertical of the first pipe part. A second pipe portion disposed in the downward direction, Of the tube is one that communicates with the vertical drain material and the catchment basins.

  Further, the soft ground improvement device according to the present invention is the soft ground improvement device that creates a reduced pressure region isolated from the peripheral portion of the improved ground in the improved ground by applying a vacuum pressure to the improved ground. A plurality of vertical drain members installed at a predetermined interval in the improved ground, a pipe connected to the vertical drain material, one or a plurality of water collecting basins connected to a water collecting path of the pipe, and the water collecting A submersible pump for draining the interstitial water collected in the dredging to a drainage tank outside the improved ground via a drainage pipe, and a vacuum pump for applying a vacuum pressure to the pipe. 1 pipe material, a plurality of second pipe materials, a plurality of branch pipes, and a plurality of drain connection pipes, wherein the branch pipe includes a first connection portion to which a pair of the first pipe materials are connected. A second connecting portion to which the pair of second pipe members are connected; A branch part that branches the first connection part and the second connection part, and the drain connection pipe is connected to a connection port to which a pair of the second pipe materials are connected and the vertical drain material. The first pipe member is connected to the vacuum pump, and the second pipe member communicates with the catchment basin and is perpendicular to the first pipe member via the branch pipe. It is arranged in the downward direction.

  Further, the soft ground improvement device according to the present invention is the soft ground improvement device that creates a reduced pressure region isolated from the peripheral portion of the improved ground in the improved ground by applying a vacuum pressure to the improved ground. A plurality of vertical drain members installed at a predetermined interval in the improved ground, a pipe connected to the vertical drain material, one or a plurality of catchment basins connected to a water collection path of the pipe, and the water collection A submersible pump for draining the interstitial water collected in the dredging to a drainage tank outside the improved ground via a drainage pipe, and a vacuum pump for applying a vacuum pressure to the pipe. A first pipe member, a plurality of second pipe members, and a branch pipe to which the first pipe member and the second pipe member are connected and connected to the vertical drain member. A first connecting portion to which one pipe member is connected; A pair of second pipe members connected to each other and a second connecting portion connected to the vertical drain material; a branching portion for branching the first connecting portion and the second connecting portion; The first pipe member is connected to the vacuum pump, and the second pipe member communicates with the catchment basin and is disposed vertically downward of the first pipe member via the branch pipe. is there.

  Moreover, the branch pipe concerning this invention is connected to the 1st pipe material connected with the vacuum pump which loads a vacuum pressure in the said soft ground via the vertical drain material embed | buried in the improved ground. A drainage basin connected with the connecting portion and the vertical drain material, and collecting the interstitial water in the soft ground that is arranged vertically below the first pipe material and collected via the vertical drain material. And a second connecting portion to which the second pipe connected to the second connecting portion is connected, and a branching portion for branching the first connecting portion and the second connecting portion.

  Further, the soft ground improvement device according to the present invention is the soft ground improvement device that creates a reduced pressure region isolated from the peripheral portion of the improved ground in the improved ground by applying a vacuum pressure to the improved ground. A plurality of vertical drain materials installed at predetermined intervals in the improved ground, a horizontal drain material connected to the vertical drain material on the upper surface of the improved ground, and the vertical drain material and the horizontal drain material Drain the connected pipe, one or more catchment basins connected to the catchment route of the above-mentioned pipes, and the interstitial water collected in the catchment basin to the drainage tank outside the improved ground through the drainage pipe. A submersible pump, and a vacuum pump for applying a vacuum pressure to the pipe, wherein the pipe is connected to the first pipe section via a first pipe section and a plurality of branch sections provided at predetermined intervals. Communicated with the vertical of the first pipe section And a second tube portion which is arranged in the direction, the first tube portion communicates with the horizontal drain member, the second tubular portion in which communicates with the catchment basins.

  According to the present invention, the negative pressure path and the drainage path span the entire pipe by separating the negative pressure path and the drainage path by the plurality of branch portions provided at predetermined intervals in the double-structured pipe. And a high degree of vacuum can be maintained up to the end of the negative pressure path in the pipe. Therefore, this invention can maintain a high vacuum pressure in any location in the improved ground, and can finish uniformly over the entire improved ground.

It is a top view which shows the improved ground where the improvement apparatus of the soft ground was constructed. It is a figure which shows the vertical drain material and horizontal drain material which were installed in the soft ground. It is a schematic diagram which shows the improvement apparatus of a soft ground. It is a perspective view which shows the improvement apparatus installed in the improvement ground. It is a perspective view which shows the joining location of a horizontal drain material and piping. It is sectional drawing which shows a vertical drain material. It is a disassembled perspective view which shows the piping comprised by connecting the 1st, 2nd pipe material with a branch pipe. It is a disassembled perspective view which shows the piping comprised by connecting the 1st, 2nd pipe material with a branch pipe. It is a figure which shows another branch pipe structure. It is a figure which shows another piping structure. It is a perspective view which shows another branch pipe. It is a schematic diagram which shows the improvement apparatus of another soft ground. It is a perspective view which shows the other improvement apparatus installed in the improvement ground. It is a perspective view which shows the other improvement apparatus installed in the improvement ground. It is a disassembled perspective view which shows the drain connection pipe | tube to which a connection member is connected. It is a disassembled perspective view which shows the branch pipe to which a connection member is connected. It is a figure which shows the improvement apparatus of the conventional soft ground.

  Hereinafter, a soft ground improving device to which the present invention is applied will be described in detail with reference to the drawings. This soft ground improvement device 1 is a soft ground that creates a decompression area isolated from the periphery of the improved ground by applying a vacuum pressure to the landfill area around the lake and the soft ground such as a landfill with mud. It is an improved device.

[overall structure]
The improved device 1 shown in FIGS. 1 to 4 covers the improved ground 2 with a sealing sheet (see FIG. 17) and applies a vacuum pressure to the improved ground 2, so that the improved ground 2 has a peripheral portion around the improved ground 2. It is an improvement device for soft ground that creates an isolated decompression area. The improved device 1 includes a plurality of vertical drain members 3 installed at a predetermined interval in the improved ground 2, a horizontal drain material 4 connected to the plurality of vertical drain members 3 on the upper surface of the improved ground 2, A pipe 5 connected to a plurality of horizontal drain materials 4 to collect pore water in the improved ground 2, a water collecting trough 6 installed in the improved ground 2 and connected to the water collecting path of the pipe 5, A submersible pump 9 for draining the interstitial water collected in the water tank 6 to a drain tank 8 outside the improved ground 2 through a drain pipe 7, and a vacuum pump for applying a vacuum pressure to the pipe 5 through a suction pipe 11 10.

  Then, as shown in FIG. 2, the improvement device 1 places the vertical drain material 3 at a predetermined interval in the improved ground 2, and the extra length portion of the vertical drain material 3 protruding to the ground surface is the horizontal drain material 4. Overlaid and connected by stapler. The horizontal drain material 4 is disposed on a pipe 5 disposed in a substantially orthogonal direction, and is connected to the pipe 5 at the intersection.

  The pipe 5 is connected to the water collecting tank 6 and is connected to the vacuum pump 10 via the suction pipe 11, and the pressure inside the pipe 5 is reduced by the vacuum pump 10, whereby the horizontal drain material 4 and the vertical drain material 3. The pore water in the improved ground 2 sucked up through the water flows into the drainage basin 6.

[Vertical drain]
As shown in FIG. 6, the vertical drain material 3 includes a core material 12 through which pore water in the improved ground 2 passes, and a filter 13 provided around the core material 12 and through which the pore water in the improved ground 2 passes. Have The core material 12 is provided with a plurality of partition walls extending in the width direction on both surfaces of the long body so that a plurality of grooves 12a serving as water passages for moisture in the improved ground 2 are formed in the length direction. . This core material 12 has a certain degree of flexibility in consideration of convenience of transportation and the like, and a material having a shape retaining property for securing a sufficient water passage even after being placed on the improved ground 2, For example, it is formed using polypropylene, polyethylene, or other resin materials. Moreover, even if the core material 12 is made of, for example, a biodegradable resin material, the environmental load can be reduced even when the core material 12 is left in the improved ground 2.

  The filter 13 covering the periphery of the core material 12 is formed from a material having water permeability, for example, a polyester non-woven fabric. The filter 13 is wound around the core material 12 and is bonded by heat welding or the like to cover the periphery of the core material 12. Moreover, the environmental load can be reduced by forming the filter, for example, with a biodegradable non-woven fabric similarly to the core material.

  The vertical drain material 3 is manufactured in advance at the manufacturing plant by covering the core material 12 with the filter 13 as described above, and after being wound in a roll shape, it is carried into the improved ground 2 serving as a construction site, It is placed on the improved ground 2 at predetermined intervals. Next, the vertical drain member 3 is connected by overlapping the extra length portion protruding from the ground surface on the horizontal drain member 4.

[Horizontal drain]
Similarly to the vertical drain material 3, the horizontal drain material 4 includes a core material and a filter that covers the core material, and is formed in a long shape. The core material is formed by embossing using, for example, hard vinyl chloride, polyethylene, or other resin material, and the filter is formed from a polyester nonwoven fabric. Moreover, the horizontal drain material 4 can reduce an environmental load by forming both a core material and a filter with a biodegradable material, for example. Such a horizontal drain material 4 is excellent in followability to ground deformation and water passage performance, is lightweight, and has good work efficiency. Further, the horizontal drain material 4 is connected to the pipe 5 so that the vacuum pressure is propagated through the pipe 5 and the pore water in the improved ground 2 sucked by the vertical drain material 3 flows into the pipe 5.

[Plumbing]
As shown in FIG. 3, the pipe 5 connected to the plurality of horizontal drain members 4 includes a first pipe part 21 via a first pipe part 21 and a plurality of branch parts 22 provided at a predetermined interval. And the second pipe portion 23 arranged vertically below the first pipe portion 21, the first pipe portion 21 communicates with the horizontal drain material 4, and the second pipe portion 23. Is in communication with a water collecting trough 6 to be described later.

  The pipe 5 is formed using, for example, hard vinyl chloride, polyethylene, or other resin material. As shown in FIG. 5, the first tube portion 21 is formed in a substantially hollow cylindrical shape, and a plurality of aperture portions 25 are formed at predetermined coupling locations where the first drain portion 4 is coupled to the horizontal drain material 4. The perforated portion 25 has, for example, a slit shape formed in the crossing direction of the horizontal drain material 4, and a filter 26 for preventing dust contamination is wound around the perforated portion 25. Further, the second pipe portion 23 is formed in a substantially hollow cylindrical shape, and a drainage port 24 through which pore water that has flowed in from the first pipe portion 21 flows out to the catchment 6 is formed. The branch part 22 makes the 1st pipe part 21 and the 2nd pipe part 23 continue, and is provided with two or more by predetermined intervals, for example, every 4-5 m.

  The pipe 5 is installed on the improved ground 2 such that the second pipe part 23 is positioned vertically below the first pipe part 21. In addition, as shown in FIG. 1, the pipe 5 is installed so as to cross a plurality of horizontal drain materials 4 arranged substantially parallel to the improved ground 2 in a certain direction, and intersects the horizontal drain material 4. The plurality of horizontal drain members 4 and the first pipe portion 21 are communicated with each other through a hole opening portion 25 provided in the portion. The pipe 5 is connected to the first pipe portion 21 and the vacuum pump 10 via the suction pipe 11, and the vacuum pressure propagates to the horizontal drain material 4 and the vertical drain material 3 via the first pipe portion 21. Is done. Further, the pipe 5 is connected to a water collecting basin 6 in which the second pipe portion 23 is installed at approximately the middle in the longitudinal direction.

  In such a pipe 5, the inside of the pipe 5 is depressurized by the vacuum pump 10, so that the interstitial water suctioned by each vertical drain material 3 flows into the first pipe portion 21 via the horizontal drain material 4. And it falls to the 2nd pipe part 23 through the branch part 22 provided at predetermined intervals by gravity. Thereby, the piping 5 can isolate | separate the flow path of pore water and the propagation path of a vacuum pressure over a full length.

[Catchment]
The water collecting trough 6 collects pore water flowing in the second pipe portion 23. For example, as shown in FIG. 1, the horizontal drain material is provided at a substantially intermediate position in the longitudinal direction of the second pipe portion 23. 4 is installed below the second pipe portion 23. The drainage basin 6 is provided with an underwater pump 9 inside, and the interstitial water collected through the second pipe portion 23 is passed through the drainage pipe 7 to the drainage tank 8 installed outside the improved ground 2. Drain. Depending on the length of the pipe 5, one or a plurality of water collecting basins are provided at an intermediate position in the longitudinal direction of the second pipe portion 23.

[Plumbing]
Further, the pipe 5 may be formed as an integrally molded product including the first pipe part 21, the branch part 22 and the second pipe part 23, or, as shown in FIG. You may form by connecting the 2nd pipe material 33 with the branch pipe 32 used as a coupling. The first tubular material 31 and the second tubular material 33 have a hollow cylindrical shape molded using, for example, hard vinyl chloride, polyethylene, or other resin material.

  Further, the branch pipe 32 includes a first fitting portion 34 having a pair of fitting ports into which the end portions of the first pipe material 31 are fitted, and a pair of fittings in which the end portions of the second pipe material 33 are fitted. A second fitting portion 35 having a joint and a connecting portion 36 for connecting the first fitting portion 34 and the second fitting portion 35 are provided, and the whole is formed in a substantially H shape.

  Each of the first pipe member 31 and the second pipe member 33 has a length of 4 m to 5 m, and 4 m in each fitting port of the first fitting part 34 and the second fitting part 35 of the branch pipe 32. Fit at intervals of ~ 5m. At this time, the 1st pipe material 31 and the 2nd pipe material 33 are airtightly fitted with each fitting part 34 and 35 so that a vacuum pressure may be maintained. The branch pipe 32 constituting the end of the pipe 5 is formed by forming only one fitting port in the second pipe member 33 as shown in FIG. 8 or by closing one of the pair of fitting ports. Both ends of the tube material 2 are closed.

  As shown in FIG. 9, the branch pipe 32 includes a first branch pipe having a first fitting portion 34 and a connecting portion 36a, and a second branch portion having a second fitting portion 35 and a connecting portion 36b. You may make it form by connecting each connection part 36a, 36b with a branch pipe.

  Further, as shown in FIG. 10, the pipe 5 may use a drain connection pipe 38 having a connection port 37 with the horizontal drain material 4, and the first pipe material 31 is connected to the branch pipe 32 and the drain connection pipe 38. You may connect via. In this case, for example, the pipe 5 may include the branch pipes 32 and the drain connection pipes 38 alternately, or may be interposed at a ratio of one branch pipe 32 to the plurality of connection pipes 38.

  The connection port 37 is a hollow flat plate-shaped convex portion that protrudes from the outer peripheral surface of a drain connection tube 38 formed in a hollow cylindrical shape and that can be airtightly attached to the tip of the horizontal drain material 4. The connection port 37 is connected by the tip of the horizontal drain material 4 being covered on the outer surface or the tip of the horizontal drain material 4 being inserted into the hollow interior, and is appropriately reinforced with a tape or the like. Further, the connection port 37 may be formed in a tapered shape with a narrow tip in order to facilitate the drawing of the horizontal drain material 4.

  Moreover, as shown in FIG. 10, the piping 5 may connect the 2nd pipe material 33 and the water collecting tank 6 with the water collecting pipe 30 used as a coupling. The water collecting pipe 30 is formed with a pair of fitting ports 30 a into which the end portions of the second pipe members 33 are fitted, and a connection port 30 b connected to the water collecting bowl 6.

  Further, as shown in FIG. 11, the pipe 5 includes a first fitting portion 34, a second fitting portion 35, and a connecting portion 36, and the first fitting portion 34 is connected to the horizontal drain material 4. A branch pipe 39 in which a connection port 37 is formed may be used.

[Construction]
As shown in FIG. 1, the improved device 1 places the vertical drain material 3 on the improved ground 2 at intervals of 1 to 2 m. The vertical drain material 3 is formed into a long length in advance and is carried into the improved ground 2 in a state of being wound in a reel shape, and is placed vertically using a known driving device. After the placement, the vertical drain material 3 is cut in a state of protruding several tens of centimeters from the ground surface of the improved ground 2. In addition, the hole at the time of casting formed in the improved ground 2 is backfilled after casting.

  Next, the horizontal drain material 4 is installed on the ground surface of the improved ground 2. The horizontal drain material 4 is wound into a roll and is carried to the site. The wound body of the horizontal drain material 4 is lightweight and is laid while being rolled by human power. After laying, the tip of the vertical drain material 3 protruding from the ground surface is superimposed on the horizontal drain material 4 and connected by a stapler.

  Next, the pipe 5 and the water collecting trough 6 are installed on the ground surface of the improved ground 2. The pipe 5 is installed so as to cross the plurality of horizontal drain materials 4, and the first drain 21 is connected to the horizontal drain material 4 at each of the connection portions where the hole openings 25 and the filters 26 are provided. The In addition, the pipe 5 is installed so that the second pipe portion 23 is positioned vertically below the first pipe portion 21 via the branch portion 22.

  The water collecting trough 6 is disposed by excavating the improved ground 2 to a required depth at a substantially intermediate position in the longitudinal direction of the second pipe portion 23. Moreover, one water collecting basin 6 is provided, for example with respect to one piping 5, and two are installed in the example shown in FIG. In addition, the water collecting trough 6 is connected to a drain pipe 7 that is provided with a submersible pump 9 and sends pore water discharged from the submersible pump 9 to a drain tank 8.

  After the improvement device 1 is installed, the improved ground 2 is covered with a sealing sheet. When the vacuum pump 10 is operated, the insides of the first pipe portion 21 (first pipe material 31), the horizontal drain material 4 and the vertical drain material 3 of the pipe 5 are depressurized through the suction pipe 11, Of vacuum pressure. The vacuum pressure propagates from the ground around the vertical drain material 3 in the decompression area to the ground around the outside, and as a result, the ground pressure (water pressure, earth pressure) toward the vertical drain material 3 is increased. Occur. In accordance with this ground pressurization, pore water contained in the ground around the vertical drain material 3 is sucked out toward the vertical drain material 3 and drained using the vertical drain material 3, the horizontal drain material 4 and the pipe 5 as drainage paths. .

  At this time, the improvement device 1 causes the pore water to flow into the first pipe portion 21 (first pipe material 31) via the horizontal drain material 4, and the inside of the first pipe portion 21 (first pipe material 31). Only the interstitial water flows down to the second pipe part 23 (second pipe member 33) by the plurality of branch parts 22 (branch pipes 32) provided at predetermined intervals in the process of passing the pore water, thereby draining the water in the pipe 5. Separate the path from the negative pressure path.

  Thus, the improved device 1 separates the negative pressure path and the drainage path by the plurality of branch portions 22 (branch pipes 32) provided at predetermined intervals in the pipe 5 having the above-described double structure. The negative pressure path and the drainage path are separated over the entire pipe 5, and a high degree of vacuum can be maintained up to the end of the negative pressure path in the pipe 5. Therefore, the improved device 1 can maintain a high vacuum pressure at any location in the improved ground 2 and can finish uniformly over the entire improved ground 2.

  The improved device 1 collects the pore water that has flowed down to the second pipe portion 23 in the water collecting tank 6 and puts it into the drainage tank 8 installed outside the improved ground 2 through the drainage pipe 7 by the submersible pump 9. Draining.

[Improved equipment]
Next, another soft ground improving device to which the present invention is applied will be described. In addition, about the same structure as the improved apparatus 1 mentioned above, the same code | symbol is attached | subjected and the detail is abbreviate | omitted. As shown in FIGS. 12 and 13, the improvement device 50 includes a plurality of vertical drain members 3 installed at predetermined intervals in the improved ground 2, and a plurality of vertical drain materials 3 on the upper surface of the improved ground 2. Connected to the horizontal drain material 4 and a plurality of horizontal drain materials 4, a pipe 51 for collecting pore water in the improved ground 2, and installed in the improved ground 2, The connected water collecting basin 6, the submersible pump 9 that drains the interstitial water collected in the water basin 6 to the drainage tank 8 outside the improved ground 2 through the drainage pipe 7, and the suction pipe 11 A vacuum pump 10 for applying a vacuum pressure to the pipe 51 is provided. Since the vertical drain material 3, the horizontal drain material 4, the water collecting tank 6, the drain pipe 7, the drain tank 8, the submersible pump 9, the vacuum pump 10, and the suction pipe 11 have the same configuration as the above-described improved apparatus 1, details Is omitted.

  In the improvement device 50, the extra length portion protruding from the ground surface of the vertical drain material 3 placed in the improved ground 2 is connected to the horizontal drain material 4. In the improvement device 50, the horizontal drain material 4 is connected to the second pipe portion 53 disposed on the vertical lower side of the first pipe portion 52 of the pipe 51.

[Plumbing]
In the pipe 51, the second pipe part 53 is connected to the water collecting tank 6, the first pipe part 52 is connected to the vacuum pump 10 through the suction pipe 11, and the inside of the pipe 51 is decompressed by the vacuum pump 10. Thus, the interstitial water in the improved ground 2 sucked up through the horizontal drain material 4 and the vertical drain material 3 flows into the second pipe portion 53 and is drained to the catchment 6 as it is.

  In the improved device 50, the vacuum pump 10 is connected to the first pipe portion 52, and the horizontal drain material 4 is connected to the second pipe portion 53 disposed vertically below the first pipe portion 52. Therefore, the pore water flows through the second pipe portion 53 and the air flows through the first pipe portion 52. That is, both the pore water and air do not flow through the first pipe portion 52, and the negative pressure path and the drainage path can be separated from the end of the improved area, so that more efficient improvement can be performed.

  The piping 51 is formed using, for example, hard vinyl chloride, polyethylene, or other resin materials. As shown in FIGS. 12 and 13, the pipe 51 communicates via a first pipe part 52 to which the vacuum pump 10 is connected, a first pipe part 52 and a branch part 54, and vertically downward. And a second pipe portion 53 provided.

  The second pipe portion 53 is formed with a connection port 55 to which the horizontal drain material 4 is connected, and a drain port 56 for allowing the interstitial water flowing in from the horizontal drain material 4 to flow out to the catchment 6. The connection port 55 has, for example, a hollow cylindrical shape, and the horizontal drain member 4 is connected by the airtight insertion of the tip of the connecting member 60 attached to the tip of the horizontal drain member 4.

  Here, the connection member 60 attached to the tip of the horizontal drain material 4 will be described with reference to FIGS. 14 and 15. The connection member 60 is a member for connecting the horizontal drain material 4 to the connection port 55 of the second pipe portion 53, and is molded into a hollow plate shape using polypropylene resin or the like. The connection member 60 is formed with a rectangular insertion hole 61 into which the tip of the horizontal drain material 4 is inserted, and a hollow cylindrical fitting convex portion 62 to be inserted into the connection port 55.

  The connecting member 60 is connected to the insertion end of the horizontal drain material 4 by a stapler after the horizontal drain material 4 is inserted into the insertion hole 61. As a result, the connection member 60 can prevent the horizontal drain material 4 from coming off. Further, the connecting member 60 may seal the boundary with the member main body with an adhesive tape after connecting the horizontal drain material 4 with a stapler. Thereby, the connection member 60 can seal the connection part with the horizontal drain material 4, and can prevent the inflow / outflow of air from the insertion hole 61 even during decompression.

  The connecting member 60 to which the horizontal drain material 4 is connected is connected to the second pipe portion 53 in an airtight manner by inserting the fitting convex portion 62 into the connection port 55 provided in the second pipe portion 53. .

  The branching part 54 of the pipe 51 separates the negative pressure path and the drainage path by branching the first pipe part 52 and the second pipe part 53, and is separated at a predetermined interval, for example, every 4 to 5 m. A plurality are provided.

  Such a pipe 51 is installed on the improved ground 2 so that the second pipe part 53 is positioned vertically below the first pipe part 52. In addition, as shown in FIG. 13, the pipe 51 is installed so as to cross a plurality of horizontal drain members 4 disposed substantially parallel to the improved ground 2 in a certain direction, and intersects with the horizontal drain members 4. The plurality of horizontal drain members 4 and the second pipe portion 53 communicate with each other through a connection port 55 provided in the portion. The pipe 51 is connected to the first pipe 52 and the vacuum pump 10 via the suction pipe 11. Further, the pipe 51 is connected to the water collecting basin 6 in which the second pipe portion 53 is installed substantially in the middle in the longitudinal direction.

  When the vacuum pump 10 is operated, the pipe 51 is transmitted with the vacuum pressure to the horizontal drain material 4 and the vertical drain material 3 via the first pipe portion 52, the branch portion 54, and the second pipe portion 53, and the improved ground 2. The pore water and air inside are sucked into the vertical drain material 3 by negative pressure. The pipe 51 branches the interstitial water and air that have flowed into the second pipe part 53 via the vertical drain material 3 and the horizontal drain material 4 at the branch part 54, and the pore water passes through the second pipe part 53 as it is. It flows and flows into the water collecting tank 6, and the air flows through the first pipe portion 52 and is exhausted by the vacuum pump 10. Thereby, the improvement apparatus 50 can perform the consolidation of the improvement ground 2, and an intensity | strength increase.

  At this time, unlike the pipe 5 described above, the pipe 51 has the horizontal drain material 4 connected to the second pipe part 53, so that the sucked pore water does not pass through the first pipe part 52. It flows to 6. For this reason, the piping 51 does not flow interstitial water and air in the first pipe part 52 connected to the vacuum pump 10, and the vacuum pump 10 connected to the first pipe part 52 does not flow. Can be used without loss. In addition, the pipe 51 is separated from the negative pressure path and the drainage path immediately after the horizontal drain material 4 in the same manner as the pipe 5 described above, so that the negative pressure path and the drainage path can be quickly transferred over the entire pipe 51. And a high degree of vacuum can be maintained up to the end of the negative pressure path in the pipe 51.

[Plumbing]
Further, the pipe 51 may be formed as an integrally molded product including the second pipe part 53 in which the first pipe part 52, the branch part 54, and the connection port 55 are formed, or in FIGS. As shown, the first pipe member 65 and the second pipe member 66 may be connected by a branch pipe 67 serving as a joint, and a drain connecting pipe 71 may be connected to the second pipe member 66.

  The first pipe material 65 constitutes a negative pressure path, and the second pipe material 66 constitutes a drainage path, each of which is molded using, for example, hard vinyl chloride, polyethylene, or other resin material. It has a hollow cylindrical shape. Further, the branch pipe 67 has a first connecting portion 68 provided with a pair of fitting ports to be connected by fitting an end portion of the first pipe member 65 and an end portion of the second pipe member 66 fitted therein. A second connecting portion 69 provided with a pair of fitting ports to be connected to each other, and a branching portion 70 for branching the first connecting portion 68 and the second connecting portion 69, such as hard vinyl chloride, polyethylene, etc. The entire resin material is molded into a substantially H shape.

  The drain connection pipe 71 is provided with a pair of connection ports connected to each other by fitting the second pipe material 66 at both ends in the longitudinal direction, and the fitting protrusion of the connection member 60 connected to the tip of the horizontal drain material 4. A connection port 72 into which the portion 62 is inserted is formed so as to protrude from the outer peripheral surface. The connection port 72 is hermetically connected to the connection member 60 by inserting the fitting convex portion 62 of the connection member 60.

  As shown in FIG. 14, the pipe 51 can also use the drain connecting pipe 71 to connect the water collecting trough 6 and the second pipe 66. In this case, the drain connection pipe 71 has a connection port 72 connected to the catchment 6 via a hollow cylindrical pipe or directly.

  In the pipe 51, the second pipe material 66 is installed vertically below the first pipe material 65 via the branch pipe 67. When the vacuum pump 10 is operated, the piping 51 propagates the vacuum pressure to the horizontal drain material 4 and the vertical drain material 3 via the first pipe 65, the branch pipe 67, the second pipe 66, and the drain connection pipe 71. Then, pore water and air in the improved ground 2 are sucked into the vertical drain material 3 by negative pressure. The pipe 51 branches the interstitial water and air that flowed into the second pipe portion 53 via the vertical drain material 3, the horizontal drain material 4, and the drain connection pipe 71 by the branch pipe 67, and the interstitial water remains as it is in the second state. The pipe 66 flows into the water collecting tank 6, and the air flows through the first pipe 65 and is exhausted by the vacuum pump 10. Thereby, the improvement apparatus 50 can perform the consolidation of the improvement ground 2, and an intensity | strength increase.

  Also at this time, the piping 51 does not flow through the interstitial water and air in the first pipe member 65 connected to the vacuum pump 10, and the pipe 51 is connected to the first pipe member 65. Energy can be used without loss. In addition, the pipe 51 is separated from the negative pressure path and the drainage path immediately after the horizontal drain material 4, so that the negative pressure path and the drainage path are separated at an early stage over the entire pipe 51. A high degree of vacuum can be maintained up to the end of the negative pressure path.

[Plumbing]
As shown in FIG. 16, the pipe 51 is connected by fitting the first connecting portion 75, the second pipe 66 and the horizontal drain material 4 which are connected by fitting the first pipe 65. A branch pipe 74 having a second connecting portion 76 and a branching portion 77 that branches the first connecting portion 75 and the second connecting portion 76 may be used. The branch pipe 74 connects the hollow cylindrical first connection portion 75 and the second connection portion 76 in parallel by a hollow cylindrical branch portion 77.

  The first connection portion 75 has a pair of fitting ports that are opened by fitting the end portions of the first pipe member 65 to both ends in the longitudinal direction. The first connection portion 75 has one end of a branching portion 77 formed in the middle portion in the longitudinal direction.

  The second connection portion 76 has a pair of fitting ports that are opened by fitting the end portions of the second pipe member 66 to both ends in the longitudinal direction. The second connecting portion 76 has the other end of the branching portion 77 formed in the middle portion in the longitudinal direction. Further, the second connection portion 76 is formed at the middle portion in the longitudinal direction such that a connection port 78 into which the fitting convex portion 62 of the connection member 60 connected to the tip of the horizontal drain material 4 is inserted protrudes from the outer peripheral surface. Has been. The connection port 78 is airtightly connected to the connection member 60 by inserting the fitting convex portion 62 of the connection member 60.

  The pipe 51 is installed in the improved ground 2 such that the second pipe 66 is located below the first pipe 65 via the branch pipe 74. Then, when the vacuum pump 10 is operated, the piping 51 propagates the vacuum pressure to the horizontal drain material 4 and the vertical drain material 3 via the first pipe material 65 and the branch pipe 74, and the pore water and air in the improved ground 2. Is sucked into the vertical drain material 3 by negative pressure. The pipe 51 branches the interstitial water and air that flowed into the branch pipe 74 via the vertical drain material 3 and the horizontal drain material 4 at the branch part 77, and the interstitial water flows through the second pipe material 66 as it is to collect water. The air flows into the cage 6, and the air flows through the first pipe member 65 and is exhausted by the vacuum pump 10. Thereby, the improvement apparatus 50 can perform the consolidation of the improvement ground 2, and an intensity | strength increase.

  Also at this time, the piping 51 does not flow through the interstitial water and air in the first pipe member 65 connected to the vacuum pump 10, and the pipe 51 is connected to the first pipe member 65. Energy can be used without loss. Further, the branch pipe 77 separates the negative pressure path and the drainage path immediately after the horizontal drain material 4, so that the negative pressure path and the drainage path are separated at an early stage over the entire pipe 51. A high degree of vacuum can be maintained up to the end of the negative pressure path.

[Others]
In order to consolidate the improved ground 2, the improved devices 1 and 50 described above, in addition to the above-described method of covering the improved ground 2 with a sealing sheet, the tip that faces the ground surface of the vertical drain material 3 without using a sealing sheet The impermeable portion may be formed from the ground to the ground, and the vertical drain material 3 may be directly connected to the connection ports 55 and 72 of the pipe 51 and the connection port 78 of the branch pipe 74 without using the horizontal drain material 4.

  In a construction method that does not use a sealing sheet, an air-impermeable portion is formed from the tip facing the ground surface to the ground by attaching a hose such as vinyl chloride to the tip of the vertical drain material 3. The hose and the tip of the vertical drain material 3 are fixed with a stapler, an adhesive tape or the like. Thereby, the improvement apparatus 1 and 50 is a vacuum, without covering the improvement ground 2 with a sealing sheet by the location from the ground surface of the vertical drain material 3 to several tens to several hundreds cm of the underground being covered with the water-impermeable material. The ground improvement work by consolidation can be done.

  At this time, in the improved devices 1 and 50, the connection member 60 is connected to the tip of the vertical drain material 3, and the vertical drain material 3 is directly connected to the connection ports 55 and 72 of the pipe 51 and the branch pipe via the connection member 60. It is connected to 74 connecting ports 78. The vertical drain member 3 may be attached with the above-described impermeable hose over the connection member 60 and the vertical drain member 3 after the tip is inserted into the insertion hole 61 of the connection member 60. Thereby, the vertical drain material 3 can seal the connection part with the connection member 60, and can prevent the inflow of the air from the insertion hole 61 also at the time of pressure reduction.

  In addition, the connection member 60 may improve the airtightness by applying an adhesive in advance to the outer surface of the member main body to which the hose is attached, and may prevent the vertical drain material 3 from coming off. . The connecting member 60 may connect the member main body and the vertical drain material 3 by a stapler after inserting the vertical drain material 3. Furthermore, the connection member 60 may seal the boundary with the member main body with an adhesive tape after inserting the vertical drain material 3 and appropriately connecting with a stapler and attaching a hose. Thereby, the connection member 60 can adhere | attach the vertical drain material 3, and can also aim at removal prevention.

  In addition, the improved devices 1 and 50 described above can be used for various methods of sucking out pore water and air in the improved ground 2 by suctioning the vertical drain material 3 with a vacuum pump in addition to the method described above. .

DESCRIPTION OF SYMBOLS 1 Improvement apparatus, 2 Improved ground, 3 Vertical drain material, 4 Horizontal drain material, 5 Piping, 6 Catchment, 7 Drain pipe, 8 Drain tank, 9 Submersible pump, 10 Vacuum pump, 21 1st pipe part, 22 Branch part, 23 second pipe part, 24 drainage port, 31 first pipe material, 32 branch pipe, 33 second pipe material, 34 first fitting part, 35 second fitting part, 36 connecting part, 50 improvement device, 51 piping, 52 first pipe part, 53 second pipe part, 54 branching part, 55 connection port, 60 connecting member, 61 insertion hole, 62 fitting convex part, 65 first pipe material, 66 Second pipe member, 67 Branch pipe, 68 First connection part, 69 Second connection part, 70 Branch part, 71 Drain connection pipe, 72 Connection port, 74 Branch pipe, 75 First connection part, 76 Second Connection part, 77 branch part

Claims (13)

In the improvement device of the soft ground that creates a decompression area isolated from the periphery of the improved ground in the improved ground by applying vacuum pressure to the improved ground,
A plurality of vertical drain materials installed at predetermined intervals in the improved ground,
Piping connected to the vertical drain material;
One or more water collecting basins connected to the water collecting path of the piping;
A submersible pump that drains the interstitial water collected in the drainage basin through a drainage pipe to a drainage tank outside the improved ground;
A vacuum pump for applying a vacuum pressure to the pipe,
The pipe communicates with the first pipe part via a first pipe part to which the vacuum pump is connected and a plurality of branch parts provided at a predetermined interval, and the vertical of the first pipe part. A soft ground improvement device comprising: a second pipe portion disposed in a downward direction, wherein the second pipe portion communicates with the vertical drain member and the catchment basin. In the improvement device of the soft ground that creates a decompression area isolated from the periphery of the improved ground in the improved ground by applying vacuum pressure to the improved ground,
A plurality of vertical drain materials installed at predetermined intervals in the improved ground,
Piping connected to the vertical drain material;
One or more water collecting basins connected to the water collecting path of the piping;
A submersible pump that drains the interstitial water collected in the drainage basin through a drainage pipe to a drainage tank outside the improved ground;
A vacuum pump for applying a vacuum pressure to the pipe,
The pipe includes a plurality of first pipe members, a plurality of second pipe members, a plurality of branch pipes, and a plurality of drain connection pipes.
The branch pipe includes a first connection part to which a pair of the first pipe members are connected, a second connection part to which a pair of the second pipe materials are connected, the first connection part, and the first connection part. A branch part for branching the two connection parts,
The drain connection pipe has a connection port to which a pair of the second pipe materials are connected, and a connection port connected to the vertical drain material,
The first pipe is connected to the vacuum pump,
The said 2nd pipe material is an improvement apparatus of the soft ground which is arrange | positioned in the perpendicular | vertical downward direction of the said 1st pipe material through the said branch pipe while communicating with the said catchment. In the improvement device of the soft ground that creates a decompression area isolated from the periphery of the improved ground in the improved ground by applying vacuum pressure to the improved ground,
A plurality of vertical drain materials installed at predetermined intervals in the improved ground,
Piping connected to the vertical drain material;
One or more water collecting basins connected to the water collecting path of the piping;
A submersible pump that drains the interstitial water collected in the drainage basin through a drainage pipe to a drainage tank outside the improved ground;
A vacuum pump for applying a vacuum pressure to the pipe,
The pipe includes a plurality of first pipe members, a plurality of second pipe members, and a branch pipe connected to the vertical drain member while the first pipe member and the second pipe member are connected to each other.
The branch pipe includes a first connection part to which a pair of the first pipe members are connected, a second connection part to which the pair of the second pipe members are connected and connected to the vertical drain material, and the first And a branch part that branches the second connection part,
The first pipe is connected to the vacuum pump,
The said 2nd pipe material is an improvement apparatus of the soft ground which is arrange | positioned in the perpendicular | vertical downward direction of the said 1st pipe material through the said branch pipe while communicating with the said catchment. A soft ground improvement device that covers the entire top surface of the improved ground with a sealing sheet and creates a decompression area isolated from the periphery of the improved ground in the improved ground,
On the improved ground upper surface, comprising a horizontal drain material connected to the vertical drain material,
The said vertical drain material is a soft ground improvement apparatus of Claim 2 or Claim 3 connected with the said piping or the said branch pipe via the said horizontal drain material. A first connecting portion to which a first pipe connected to a vacuum pump for applying a vacuum pressure in the soft ground is connected via a vertical drain material embedded in the improved ground;
Connected to the vertical drain material and connected to a drainage basin that collects pore water in the soft ground that is arranged vertically below the first pipe material and collected through the vertical drain material. A second connecting portion to which a second pipe is connected;
A branch pipe having a branch portion for branching the first connection portion and the second connection portion.   The branch pipe according to claim 5, wherein the second connection portion is connected to the vertical drain material via a horizontal drain material connected to the vertical drain material on the improved ground surface. In the improvement device of the soft ground that creates a decompression area isolated from the periphery of the improved ground in the improved ground by applying vacuum pressure to the improved ground,
A plurality of vertical drain materials installed at predetermined intervals in the improved ground,
Piping connected to the vertical drain material;
One or more water collecting basins connected to the water collecting path of the piping;
A submersible pump that drains the interstitial water collected in the drainage basin through a drainage pipe to a drainage tank outside the improved ground;
A vacuum pump for applying a vacuum pressure to the pipe,
The pipe communicates with the first pipe part via a first pipe part and a plurality of branch parts provided at predetermined intervals, and is arranged in a vertically downward direction of the first pipe part. A soft ground improvement apparatus, wherein the first pipe part communicates with the vertical drain material, and the second pipe part communicates with the catchment. The pipe includes a plurality of first pipe members, a plurality of second pipe members, and a plurality of branch pipes.
The branch pipe includes a first connection part to which a pair of the first pipe members are connected, a second connection part to which a pair of the second pipe materials are connected, the first connection part, and the first connection part. A connecting portion for connecting the two connecting portions,
The soft ground improvement device according to claim 7, wherein the pair of first pipe members and the pair of second pipe members are continuous via the branch pipe. Furthermore, the said branch pipe is a soft ground improvement apparatus of Claim 8 which has a connection port with a horizontal drain material . The pipe includes a plurality of first pipe members, a plurality of second pipe members, and a plurality of branch pipes.
The branch pipe has a connection portion to which a pair of the first pipe materials or a pair of the second pipe materials are connected, and a connection portion to be connected to another branch pipe,
The soft ground improvement device according to claim 7, wherein the pair of first pipe members and the pair of second pipe members are continuous via the branch pipe. The soft ground improvement device according to claim 7, wherein the first pipe portion is provided with a connection port that protrudes from the outer peripheral surface, is provided in a hollow shape, and is connected to a horizontal drain material .   The soft ground improvement device according to claim 9 or 11, wherein the connection port is formed in a tapered shape having a narrow tip. A soft ground improvement device that covers the entire top surface of the improved ground with a sealing sheet and creates a decompression area isolated from the periphery of the improved ground in the improved ground,
On the improved ground upper surface, comprising a horizontal drain material connected to the vertical drain material,
The said vertical drain material is a soft ground improvement apparatus of any one of Claims 7-12 connected with the said piping via the said horizontal drain material.

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