JP5322608B2 - Soft ground improvement device - Google Patents

Description

The present invention relates to a soft ground improvement device using a drain device that is used to drain moisture and the like contained in a ground softening the ground and improve the soft ground.

  To improve the soft ground by discharging moisture and air in the soft ground, the soft ground is improved by placing multiple vertical drains in the soft ground and using a sealing sheet on the placement area. An atmospheric pressure method is known that covers and pressurizes the placement area at atmospheric pressure by depressurizing with a vacuum pump to promote drainage.

  Further, in recent years, as an improvement method for soft ground, a water-impervious part that blocks water from the outer peripheral surface by a certain length from the upper end is provided, and the water permeated through the water below the impermeable part. A construction method using a vertical drain is proposed. In such a vertical drain, an impermeable portion is embedded at a predetermined depth, an upper end is exposed to the ground surface, and an airtight cap connected to a water collecting pipe is fitted. And drainage is promoted without using a sealing sheet by decompressing the inside of a water collection pipe with a vacuum pump.

  As described above, the vertical drain is attached to the upper end of the vertical drain with an airtight cap, and is connected to the water collecting pipe through the airtight cap. The hermetic cap has an opening of a size that allows the upper end of the vertical drain to be inserted at one end, and when the upper end of the vertical drain is inserted, the opening is sealed with tape, adhesive, etc. It is connected.

  In addition, the airtight cap is provided with a hose at the other end for guiding the moisture in the ground collected by the vertical drain to the water collection pipe, and the tip of the hose is connected to the water collection pipe installed at the construction site. The underground water collected by the drain is introduced to the water collecting pipe.

  The airtight cap and the vertical drain are connected in advance at predetermined intervals when the vertical drain is manufactured from the viewpoint of reducing the number of man-hours for on-site work, and are wound in a roll for convenience of transportation. As described above, the vertical drain in which the airtight cap is interposed at every predetermined interval is difficult to wind in a roll shape, and there is a problem that the delivery at the construction site may not be performed smoothly. Can occur.

  In addition, since the hose of the airtight cap and the water collection pipe are connected, it is necessary to connect the water collection pipe as many as the number of vertical drains, increasing the work man-hours in the field, and the connection between the airtight cap and the water collection pipe. There was a risk of air leakage as many as the number of connection points, and the work of confirming air leakage was complicated.

Furthermore, it is necessary to install water collecting pipes according to the placement position of the vertical drain, and there is no degree of freedom for installing water collecting pipes according to the land shape at the construction site, and it is difficult to improve efficiency. For example, when a vertical drain is installed in a narrow construction site where a narrow ground is protruding, it is necessary to install a water collection pipe near the vertical drain that collects the water in the ground that the vertical drain has sucked up. is there. Such a water collecting pipe is not necessarily arranged so as to be connectable with a vertical drain placed in a vast area of a construction site, and is installed only for collecting water in the ground of the narrow land, etc. In some cases, it was inefficient.
JP 2006-241872 A

Accordingly, the present invention is to reduce the man-hours of field operations, it is possible to improve the efficiency, and also aims to provide a soft soil modifying apparatus using a dangerous yet name connecting member air leakage.

In order to solve the above-described problem, a soft ground improvement device according to the present invention includes a drain that is buried from the ground surface to the ground to guide moisture in the ground to the ground, and a ground that is collected from the drain. A water collecting pipe for collecting the water, a connecting member for connecting the drain and the water collecting pipe, and a pressure reducing means connected to the water collecting pipe for decompressing the inside of the drain, wherein the connecting member comprises the drain A plurality of connecting parts connected to each other, a water collecting part collecting water in the ground introduced from the drain through the connecting part, and a tip connected to the water collecting pipe to collect water in the water collecting part. A water conduit that guides the water to the water collecting pipe, and each connecting portion of the connecting member, the water collecting portion, and the water conduit are provided on substantially the same plane and formed in a substantially flat shape, The connecting member is substantially the same as the water collecting pipe In which are arranged in a spaced position on the surface.

Moreover, each connection part of the said connection member, the said water collection part, and the said water conduit may be integrally molded.
Further, the connecting member may be connected to the water collecting pipe via another connecting member, and inside each connecting portion of the connecting member, a distal end portion of the drain to be inserted is disposed, and the drain is inserted. A positioning pin for determining the position may be provided upright.

  Here, the drain connected to the connecting member is formed with an air-impermeable portion in which a tip portion facing the ground surface is covered with an impermeable material, and this air-impermeable portion is formed. Not included.

  According to the present invention, since each drain and the water collecting pipe are connected directly to the water collecting pipe via the connecting members connected to the plurality of drains, the water collecting pipe is optimal regardless of the drain burying position. Can be installed in position.

Hereinafter, the soft weak soil improvement apparatus to which the present invention that apply, will be described in detail with reference to the drawings. Soft ground improvement device 1 to which the present invention that apply, as shown in FIG. 1, to facilitate the consolidation settlement by sucking the water contained in the ground of soft ground 2, is intended to improve, the soft in the ground The drain 3 to be placed, the water collecting pipe 4 for collecting the water in the ground collected from the drain 3, the connecting member 5 for connecting the drain 3 and the water collecting pipe 4, and the water collecting pipe 4, And a vacuum pump 8 serving as a decompression means for decompressing the inside of the drain 3.

  And the soft ground improvement apparatus 1 drives the drain 3 in the soft ground 2 at predetermined intervals, connects the tip of the drain 3 facing the ground surface and the connecting member 5, and connects the connecting member 5 and the water collecting pipe 4. And connect. The connecting member 5 is provided with a water conduit 22, and a suction hose 6 connected to the water conduit 22 is connected to the water collecting tube 4. Thereafter, the inside of the water collecting pipe 4 and the inside of the drain 3 are depressurized, so that moisture in the ground is sucked up through the drain 3 and discharged from the water collecting pipe.

  As shown in FIG. 2, the drain 3 includes a drain pipe 12 through which moisture in the soft ground 2 flows and an air-impermeable portion 13 provided at an end of the drain pipe 12. The drain pipe 12 includes a core material 10 that serves as a water passage for moisture in the soft ground 2, and a filter 11 that is provided around the core material 10 and transmits moisture in the soft ground 2. The core material 10 is provided with a plurality of partition walls extending in the longitudinal direction on both surfaces of the long body, whereby a plurality of grooves 10a serving as moisture passages in the soft ground 2 are formed in the longitudinal direction. . This core material 10 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 soft ground 2, For example, it is formed using vinyl chloride, polyethylene, or other resin materials. Moreover, even if the core material 10 is formed of, for example, a biodegradable resin material, it can reduce the environmental load even when left in the soft ground 2.

  The filter 11 covering the periphery of the core material 10 is formed of a material having water permeability, for example, a nonwoven fabric made of polyester. The filter 11 may be formed in a long shape, and may be wound around the core material 10 to cover the periphery of the core material 10 by being bonded by heat welding or the like.

  Further, the drain 3 is covered with a water-impermeable material at a tip portion extending from the ground surface of the drain pipe 12 to several tens to several hundreds cm below, thereby forming an air-impermeable portion 13. As shown in FIG. 3, the air-impermeable portion 13 is formed with an annular body 14 having a size capable of covering the drain 3 using a water-impermeable material such as vinyl chloride, and is inserted through the tip of the drain 3. Is formed. The annular body 14 and the tip of the drain 3 are fixed with a stapler, a tape, or the like.

  In addition, as shown in FIG. 4, the air-impermeable portion 13 is wound around a distal end portion of the drain 3 with a long body 15 having a size that can cover the drain 3 using an impermeable material. You may make it form by adhere | attaching the edge part of the elongate body 15 by heat welding etc. FIG.

  The soft ground improvement device 1 evacuates the soft ground 2 without covering the soft ground 2 with a sheet that seals the soft ground 2 by covering the drain 3 from the surface of the drain 3 to several tens to several hundreds of centimeters with an impermeable material. The ground improvement work by consolidation can be done.

  The drain 3 is manufactured in advance by covering the core material 10 with a filter 11 and a water-impermeable material at predetermined intervals in a manufacturing factory, and after being wound in a roll shape, the drain 3 is applied to the soft ground 2 that becomes a construction site. It is carried in and placed on the soft ground 2 at a predetermined interval by the same procedure as that for normal vertical drain placement. Next, the drain 3 is connected to the connection part 20 of the connecting member 5 at the tip part facing the ground surface. Connection of the connecting member 5 to the connecting portion 20 is performed by inserting the distal end portion of the drain 3 into the connecting portion 20 formed of a rectangular opening and winding the periphery of the connecting portion 20 with a tape or the like. As a result, the drain 3 is connected to the water collecting pipe 4 via the connecting member 5, and the inside of the drain 3 is decompressed by the decompression means, and the water in the soft ground 2 can be sucked and flowed to the water collecting pipe 4.

  Water collecting pipes 4 that collect moisture flowing in the drain 3 are installed on the soft ground 2 at predetermined intervals. The tip of the suction hose 6 connected with the connection member 5 mentioned later is attached to the outer periphery of the water collection pipe 4. One water collecting pipe 4 is further connected to a plurality of drains 3 via a plurality of connecting members 5, and water in the soft ground 2 sucked from each drain 3 is collected. The plurality of water collecting pipes 4 are connected to a drain pipe 7, and the collected water is drained out of the soft ground 2 through the drain pipe 7.

  When the water collecting pipe 4 is carried into the soft ground 2 which is an enforcement site and is installed at a predetermined position, a suction hose 6 connected to the connecting member 5 is attached. The suction hose 6 is attached by inserting the suction hose 6 into an attachment portion formed on the outer peripheral portion of the water collecting pipe 4 and having an attachment hole, and winding the periphery with a tape.

  In addition, the inside of the water collecting pipe 4 is decompressed by a decompression means such as a vacuum pump 8 attached to the drain pipe 7, thereby sucking moisture in the ground of the soft ground 2 into the drain 3.

  Next, the connecting member 5 that connects the drain 3 and the water collecting pipe 4 will be described. As shown in FIG. 5, the connecting member 5 includes a plurality of connecting portions 20 to which the drain 3 is connected, a water collecting portion 21 that collects water introduced through the connecting portion 20, and a water collecting portion 21. A water conduit 22 for guiding the collected water to the water collector 4.

  The connecting portion 20 is a portion to which the distal end portion of the drain 3 facing the ground surface is connected, and an opening 23 into which the distal end portion of the drain 3 is inserted is formed. The opening 23 is formed in a rectangular shape, for example, according to the shape of the drain 3. Further, the opening 23 is continuous with the water collecting part 21, and the water flowing in from the drain 3 is collected in the water collecting part 21. For example, four connecting portions 20 are provided for each connecting member 5, and the opening portions 23 face each other.

  Positioning pins 24 that stand up against the tip of the drain 3 to be inserted and determine the insertion position of the drain 3 are erected inside each connection portion 20. The positioning pin 24 is erected between the connecting portion 20 and the water collecting portion 21, and the tip of the core member 10 of the drain 3 inserted from the opening 23 is brought into contact therewith. Thereby, the positioning pin 24 can prevent the core material 10 from entering the water collecting portion 21. Further, the positioning pin 24 stands up between the upper and lower surfaces of the connecting member 5, thereby serving as a reinforcing member against the load in the vertical direction of the connecting member 5.

  When the tip of the drain 3 is inserted into the opening 23 and the connecting member 20 is inserted until the core member 10 comes into contact with the positioning pin 24, the outer periphery of the opening 23 is wound with a tape or the like, Fixed. Since the leading end portion of the drain 3 is an air-impermeable portion, the drain 3 and the connecting member 5 are sealed by being wound around the opening 23 with a tape or the like.

  The water collecting part 21 is a part that collects water introduced from the drain 3 fixed to the connection part 20, is provided in the center of the connecting member 5, and is continuous with the plurality of connection parts 20. The water collecting unit 21 is continuous with the water conduit 22, and the collected water flows out to the water conduit 22.

  The water guide pipe 22 is led out of the connecting member 5 from the water collecting portion 21, the suction hose 6 is connected to the tip, and is connected to the water collecting pipe 4 via the suction hose 6. The water conduit 22 has a shape and a size that allows the suction hose 6 to be inserted through the tip of the water conduit 22, and is connected to the suction hose 6 by inserting the suction hose 6 and winding the tip with tape or the like. One or a plurality of water conduits 22 are formed on one connecting member 5. When a plurality of water conduits 22 are formed, a plurality of connecting members 5 can be connected via the suction hose 6. The suction hose 6 is a flexible hose, one end is connected to the water conduit 22 of the connecting member 5, and the other end is attached to the attachment portion of the water collecting pipe 4.

  In the connecting member 5, the connecting portion 20, the water collecting portion 21, and the water conduit 22 are provided on substantially the same plane, and are formed in a flat shape as a whole. Therefore, as shown in FIG. 6, the connecting member 5 is embanked on the soft ground 2 in a state where the tip of the drain 3 is connected to each connecting portion 20 and the suction hose 6 is connected to the water guide portion 22. 9 can also be used for the embankment combined construction method.

  Further, the connecting member 5 is made of a synthetic resin such as polyvinyl chloride, and the connecting portion 20, the water collecting portion 21, and the water conduit 22 are integrally formed, and there is no connecting portion. Therefore, the connecting member 5 has no risk of air leakage, eliminates the need for work for air leakage inspection, and improves work efficiency.

  Next, an installation example of the soft ground improvement device 1 using the connecting member 5 will be described. The drain 3 is formed in advance at a factory by forming an air-impermeable portion 13 covered with an impermeable material on the drain tube 12 at predetermined intervals, and the drain tube having the air-impermeable portion 13 formed at predetermined intervals. It is carried into the construction site in a state where 12 is wound on a reel. And the soft ground improvement apparatus 1 drives the drain 3 perpendicularly to the soft ground 2 used as a construction site for every predetermined interval using a well-known driving device. After the placement, the placement hole formed in the soft ground 2 is backfilled. At this time, the drain 3 is embedded in a location where the tip of the air-impermeable portion 13 extends from the ground surface to several tens to several hundreds of centimeters, and the tip portion where the air-impermeable portion 13 is formed projects to the ground surface. 5 can be connected.

  Next, the connecting member 5 is installed at substantially the center position of the drain 3 driven in four places, and the distal end portion of each drain 3 is connected to the connecting portion 20 of the connecting member 5, and the water guide pipe 22 of the connecting member 5 is connected to the water conduit 22. Connect the suction hose 6. In this way, the unit 30 in which the four drains 3 and the one connecting member 5 are connected is formed, and the water collecting pipe 4 is installed between the plurality of units 30. And the suction hose 6 extended from the some unit 30 is attached to the attachment part of the water collection pipe | tube 4. As shown in FIG.

  The water collecting pipe 4 connected to the plurality of units 30 via the suction hose 6 is connected to the drain pipe 7 together with other water collecting pipes 4. A vacuum pump 8 is attached to the drain pipe 7. When the vacuum pump 8 is activated, the inside of the drain 3 is depressurized through the water collecting pipe 4 and the connecting member 5, and moisture in the ground of the soft ground 2 is sucked into the drain 3 through the air permeable portion. The The water sucked into the drain 3 is collected in the water collecting portion 21 of the connecting member 5, is led to the water conduit 22, flows to the water collector 4 through the suction hose 6, and is drained from the drain pipe 7.

  In addition, if the suction hose 6 is connected and integrated in advance with the water conduit 22 of the connecting member 5 in a factory or the like, the work at the site is reduced and efficiency is improved.

  According to such a soft ground improvement device 1, each drain 3 and the water collecting pipe 4 are connected directly to the water collecting pipe 4 through the connecting member 5 connected to the plurality of drains 3 without being directly connected. The water collecting pipe 4 can be installed at an optimum position regardless of the buried position of the drain 3. That is, as shown in FIG. 1, even when the drain 3 is buried in a narrow land 31 that is not wide enough to install the water collecting pipe 4, water can be introduced through the connecting member 5 and the suction hose 6. Therefore, the water collecting pipe 4 can be installed at a place where the other unit 30 can be connected. As described above, the soft ground improvement device 1 can reduce the number of water collecting pipes 4 without having to install useless water collecting pipes 4 due to the land shape of the soft ground 2, and can install the water collecting pipes 4 at appropriate places. can do.

  Further, in the soft ground improvement device 1, since the drain 3 and the water collection pipe 4 are not directly connected, and the suction hose 6 connected to the connection member 5 is connected to the water collection pipe 4, compared to the number of drains 3. The number of connection points of the water collecting pipe 4 is small. Therefore, it is possible to reduce the number of man-hours for attaching the water collecting pipe 4 to the attaching portion, reduce the risk of air leakage in the attaching portion of the water collecting pipe 4, and the man-hour for air leakage inspection, thereby improving the work efficiency.

  In addition, although each drain 3 is connected with each connection part 20 of the connection member 5, this man-hour is needed similarly to the past. However, since the soft ground improvement device 1 does not directly connect the drain 3 and the water collecting pipe 4, the installation position of the water collecting pipe 4 can be selected regardless of the buried position of the drain 3. Since the connection is made to the connecting portion 20 of the connecting member 5 having a high degree of freedom of installation compared to the case of connecting to the water collecting pipe 4 having a restriction in position, the work can also be performed efficiently.

  Furthermore, since the soft ground improvement apparatus 1 does not directly connect the drain to the water collecting pipe, it is not necessary to provide the water collecting pipe with the number of connections to the drain and to move while connecting the drain. That is, since the soft ground improvement apparatus 1 connects the four drains 3 to the one connection member 5, the connection work of the four drains 3 can be performed at one place where the connection member 5 is installed. Therefore, the work efficiency can be improved as compared with the work of moving while the drain is directly connected to the water collecting pipe. Moreover, although the soft ground improvement apparatus 1 attaches the suction hose 6 to the water collecting pipe 4, the number of attachment locations may be smaller than the number of drains 3.

  As shown in FIG. 1, the soft ground improvement device 1 can also connect the unit 30 to the water collecting pipe 4 via another unit 30. That is, since one connecting member 5a is formed with a plurality of water conduits 22, one of the suction hoses 6 attached to each water conduit 22 is attached to the water conduit 22 of the other connecting member 5b, and the other suction hose. 6 can also be attached to the attachment portion of the water collecting pipe 4. The connecting member 5b to which one suction hose 6 is attached closes the water conduit 22 to which the suction hose 6 is not attached with a tape or a cap. As described above, the soft ground improvement device 1 connects the plurality of units 30 and connects them to the water collecting pipe 4, so that the water collecting pipe 4 can be used regardless of the buried portion of the drain 3 where the underground moisture needs to be sucked. The installation location of can be selected.

  In the soft ground improvement device 1, the number of connection portions 20 of the connecting member 5 is not limited to four, and may be two or more. The connection portion 20 to which the drain 3 is not connected is blocked with a tape, a cap, or the like. And airtight.

  Moreover, the soft ground improvement apparatus 1 connects the front-end | tip part of the drain 3 directly to the connection part 20 of the connection member 5, and connects a well-known cap member to the front-end | tip part of the drain 3, and connects a connection part via this cap member. 20 may be connected. The cap member has airtightness, a hose connected to the connection portion 20 is formed at one end, and a fitting portion into which the distal end portion of the drain 3 is fitted is formed at the other end. The cap member is fitted to the distal end portion of the drain 3 that has been cut to a predetermined length in the factory in advance, and the drain 3 with the cap member is wound in a roll shape and carried in. Moreover, a cap member is attached to the front-end | tip part of the drain 3 cut | disconnected by the predetermined length at the construction site.

  By interposing such a cap member, it is possible to easily and quickly connect the drain 3 and the connecting portion 20 and to ensure airtightness.

Also, soft weak soil improvement apparatus to which the present invention that apply not only drain 3 provided FuToruki portion 13 to the drain pipe 12 described above, using a drain without the FuToruki part, conventional soft ground It can also be applied to the atmospheric pressure method of covering with a sealing sheet. In this case, the drain pipe 12 that is not provided with the air-impermeable portion 13 is driven into the soft ground 2, and the connecting member 5 is connected to the tip of the drain pipe 12 facing the ground surface and the connection portion 20. The

It is a top view which shows the structure of a soft ground improvement apparatus. It is a perspective view which shows the structure of a drain. It is a perspective view which shows the drain in which an air-impermeable part is formed. It is a perspective view which shows the drain in which an air-impermeable part is formed. It is a perspective view which shows a connection member. It is sectional drawing which shows the connection member applied to the embankment combined use construction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Soft ground improvement apparatus, 2 Soft ground, 3 Drain, 4 Water collecting pipe, 5 Connection member, 6 Suction hose, 7 Drain pipe, 8 Vacuum pump, 10 Core material, 11 Filter, 12 Drain pipe, 13 Air-impermeable part, 20 connecting parts, 21 water collecting parts, 22 water conduits, 23 openings, 24 positioning pins, 30 units

Claims (4)

A drain that is buried from the ground surface to the ground to guide the water in the ground to the ground,
  A water collecting pipe for collecting water in the ground collected from the drain;
  A connecting member for connecting the drain and the water collecting pipe;
  A pressure reducing means that is connected to the water collecting pipe and depressurizes the drain;
  The connecting member is
  A plurality of connecting portions to which the drain is connected;
  A water collecting part for collecting water in the ground guided by the drain through the connection part;
  A tip pipe connected to the water collection pipe, and a water guide pipe for guiding the water collected in the water collection section to the water collection pipe,
  Each of the connection parts, the water collecting part, and the water conduit of the connecting member are provided on substantially the same plane and formed in a substantially flat shape,
  The soft ground improvement device, wherein the connecting member is disposed at a position spaced apart on substantially the same plane as the water collecting pipe. The soft ground improvement device according to claim 1, wherein each connection portion of the connecting member, the water collecting portion, and the water conduit are integrally formed. The soft ground improvement device according to claim 1, wherein a reinforcing member provided with a leading end portion of a drain to be inserted is erected inside each connection portion of the connecting member. The soft ground improvement device according to claim 1 or 2, wherein the connecting member is connected to the water collecting pipe via another connecting member .

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