JP2013096217A - Installation device of drain member and installation method of drain member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To push down a co-lifted drain member to a prescribed depth in weak ground and to surely install the drain member to the prescribed depth in the weak ground.SOLUTION: A mandrel 4 in the state that an anchor member 3 is arranged at a distal end 4a, a drain member 2 with the anchor member 3 connected to a distal end 2a is inserted to an inner part 4b, and a rod member 5 is housed in the inner part 4b is installed to the prescribed depth in weak ground 100 with the anchor member 3 as an insertion end. When the drain member 2 is co-lifted when installing the drain member 2 to the prescribed depth in the weak ground 100, the rod member 5 is projected from the mandrel 4, the anchor member 3 is pushed down to the prescribed depth in the weak ground 100, and the drain member 2 is installed to the prescribed depth in the weak ground.

Description

  The present invention relates to a drain member placing apparatus and a drain member placing method for placing a drain member used to improve soft ground by discharging moisture contained in the ground and improving the soft ground.

  Conventionally, there is a vertical drain construction method as one of ground improvement methods for improving soft ground by discharging moisture and air (hereinafter referred to as moisture) in the soft ground. A drain material is cast to a predetermined depth in the soft ground by a driving device, and a load is applied by embankment or the like. And the water | moisture content etc. in a soft ground are discharged | emitted via a drain material, It is a construction method which aims at the consolidation promotion of a ground.

  As a placement device for placing a drain member used in such a vertical drain construction method, there is one as disclosed in Patent Document 1. Specifically, the placement device of Patent Document 1 is provided with a mandrel (described as a casing in Patent Document 1) having an upper end and a lower end opened and a lid that can be opened and closed at the lower end opening, and the mandrel. A drain member that allows moisture in soft ground to pass through and a mandrel that is movable, is longer than the entire length of the mandrel, has a lower end that engages with the end of the drain member, and an upper end that engages with the upper end of the mandrel And a rod member having a stopper portion.

  In such a placement apparatus of Patent Document 1, first, a lower end opening is closed by a lid, and a mandrel in a state where the tip of the drain member is held between the lid and the lower end of the rod member is a placement machine. Is driven to a predetermined depth in the soft ground. Next, in the placement device of Patent Document 1, the lid is opened and only the mandrel is pulled up by the placement machine. At this time, in the placing device of Patent Document 1, the rod member is projected to the outside from the lower end opening of the mandrel by its own weight, and the lower end of the rod member is engaged with the tip of the drain member, so that the drain member is soft ground. Stay inside the predetermined depth. Next, when the mandrel is pulled up to some extent by the driving machine, the upper end of the mandrel is engaged with the stopper portion of the rod member, and the drain member is held at a predetermined depth in the soft ground. In this state, the rod member is pulled up as the mandrel is pulled up. As described above, in the placing device of Patent Document 1, the drain member is placed to a predetermined depth in the soft ground.

  However, in the placement device of Patent Document 1, when the weight of the rod is heavy or when the content of moisture or the like in the soft ground is large, the rod member does not stay at a predetermined depth in the soft ground, but is drained by the rod. There is a possibility that the member is pushed down to a position deeper than a predetermined depth in the soft ground.

  Furthermore, in the driving device of Patent Document 1, since the rod member is longer than the entire length of the mandrel, the handling is inconvenient, and the cost is high and it is not economical.

  Furthermore, in the driving device of Patent Document 1, when the drain member is being driven, the drain member is lifted up. When the so-called co-up occurs after the rod member is pulled up, the drain member is anchorless. Since it is difficult to re-engage the lower end of the member and the tip of the drain member, the drain member lifted together by the rod member cannot be pushed down to a predetermined depth in the soft ground. Therefore, in the case where both sides rise, it is necessary to pull out the drain member and redo the drain member placing operation. Therefore, workability is poor, the construction period is long, and it is not economical.

  Furthermore, even if the lower end of the rod member and the tip of the drain member can be re-engaged, the driving device of Patent Document 1 does not have a drive unit that drives the rod member, so the rod member alone can move. First, in order to push down the drain member lifted together by the rod member to a predetermined depth in the soft ground, it is necessary to move the mandrel downward again by a driving machine. Therefore, workability is poor and it is not economical.

  Further, there is a driving device in which a hydraulic drive device capable of protruding a rod member within a predetermined range is built in a lower end of a mandrel.

  In a driving device incorporating such a hydraulic drive device, first, the mandrel is driven to a predetermined depth of the soft ground with the lower end of the rod member and the tip of the drain member engaged. Next, at the same time as the mandrel is pulled up, the rod member is protruded to the outside from the lower end opening of the mandrel by the hydraulic drive device, and the lower end of the rod member is engaged with the tip of the drain member, so that the drain member becomes soft ground. Stay inside the predetermined depth. Next, after the mandrel is pulled up to some extent, the rod member is housed in the mandrel by the hydraulic drive device, and the mandrel is pulled up in a state where the drain member is held at a predetermined depth in the soft ground. As described above, in the driving device incorporating the hydraulic drive device, the drain member is driven to a predetermined depth in the soft ground.

  However, in a driving device incorporating such a hydraulic drive device, it is necessary to incorporate the hydraulic drive device in the mandrel. Therefore, the mandrel becomes large, the device becomes complicated, and the cost is high, which is not economical.

  Further, in a driving device incorporating such a hydraulic drive device, when the drain member rises together after the rod member is lifted, the drain member is anchorless, and the lower end of the rod member and the distal end of the drain member are connected again. Since it is difficult to engage, even if the rod member is protruded again by the hydraulic drive device, the drain member raised together by the rod member cannot be pushed down to a predetermined depth in the soft ground. Therefore, in the case where both sides rise, it is necessary to pull out the drain member and redo the drain member placing operation. Therefore, workability is poor, the construction period is long, and it is not economical.

  Furthermore, even if the lower end of the rod member and the tip of the drain member can be reengaged, the amount of protrusion of the rod member by the hydraulic drive device is determined, so the rod member is pulled up and stored in the mandrel, and the mandrel is hydraulically In the event that the joint rises when the rod member is lifted more than the protruding amount of the drive member, in order to push down the drain member raised together by the rod member to a predetermined depth in the soft ground, the mandrel is again pushed by the driving machine. It is necessary to move down. Therefore, workability is poor and it is not economical.

JP 59-195915 A

  The present invention has been proposed in view of such a conventional situation, and when a drain member used for improving a soft ground is driven to a predetermined depth in the soft ground, the drain member is raised together. Even so, an object of the present invention is to provide a drain member placing device and a drain member placing method that can push down the drain member that has been raised together and reliably place it at a predetermined depth in soft ground. To do.

  A drain member placing device according to the present invention includes a drain member that transmits moisture in soft ground, an anchor member that is connected to a distal end portion of the drain member, an anchor member that is disposed at the distal end portion, and a drain member. Is provided so as to be movable inside the mandrel, and a rod member that protrudes from the mandrel and presses the anchor member. In the drain member placing device according to the present invention, the anchor member is arranged at the tip, the drain member is inserted into the inside, and the rod member is housed in the mandrel, with the anchor member as the insertion end. The drain member is driven to a predetermined depth in the soft ground, and the mandrel and rod member driven to the predetermined depth in the soft ground are pulled up from the predetermined depth in the soft ground and pulled out from the soft ground. To a predetermined depth in soft ground. Furthermore, in the drain member placing device according to the present invention, when the drain member rises together when placing the drain member to a predetermined depth in the soft ground, the rod member protrudes from the mandrel and the anchor member is soft. The drain member is pushed down to a predetermined depth in the ground by pushing down to a predetermined depth in the ground.

  In the drain member placing method according to the present invention, the anchor member is disposed at the tip, the moisture in the soft ground is permeated, the drain member connected to the tip is inserted inside, and the rod member is inserted. The mandrel stored in the inside is driven to a predetermined depth in the soft ground with the anchor member as the insertion end, and the mandrel and rod member driven to the predetermined depth in the soft ground are placed in the soft ground. From the predetermined depth, the drain member is pulled out from the soft ground, and the drain member is driven to a predetermined depth in the soft ground. Furthermore, in the drain member placing method according to the present invention, when the drain member rises together when the drain member is placed to a predetermined depth in the soft ground, the rod member protrudes from the mandrel and the anchor member is soft. The drain member is pushed down to a predetermined depth in the ground by pushing down to a predetermined depth in the ground.

  According to the drain member placing device and the drain member placing method according to the present invention, when the drain member used for improving the soft ground is placed to a predetermined depth in the soft ground, the drain member is shared. Even if it rises, the rod member can be protruded from the tip of the mandrel, and the drain member that has risen together can be pushed down to a predetermined depth in the soft ground. Therefore, according to the drain member placing device and the drain member placing method according to the present invention, the drain member can be reliably placed to a predetermined depth in the soft ground.

It is the longitudinal cross-sectional view which showed the driving device to which this invention is applied. It is the longitudinal cross-sectional view which showed the placement apparatus to which this invention is applied, and expands the front-end | tip part side. It is the top view which showed the placement apparatus to which this invention is applied. It is the perspective view which showed the water-permeable part of the drain member. It is the perspective view which showed a mode that the drain member was connected with the anchor member. It is process drawing for demonstrating the placement operation | work using the placement apparatus to which this invention is applied. It is the schematic which showed the mode of the placement operation | work of a drain member. It is the figure which showed the locus | trajectory with respect to the time of the depth of the front-end | tip part of a drain member, (A) shows the locus | trajectory when it does not rise together, (B) shows the locus | trajectory when it raises together. . It is the longitudinal cross-sectional view which showed the mandrel provided so that it might be gradually diameter-reduced as a front-end | tip part side goes to a front-end | tip part side. It is the top view which showed the anchor member which formed the connection part in the one end part side of the width direction rather than the substantially center part of the width direction of the main-body part. It is the longitudinal cross-sectional view which showed the placement device of the modification which provided the guide member which guides a movement of a rod member in a mandrel, and provided the engaging part engaged with a guide member in the outer peripheral surface of a rod member.

  Hereinafter, a drain member placing apparatus and a drain member placing method to which the present invention is applied will be described with reference to the drawings.

  As shown in FIG. 1, a drain member placement device (hereinafter referred to as a placement device) 1 to which the present invention is applied has a drain member 2 used for improving the soft ground 100 in a predetermined position in the soft ground 100. Can be driven to a depth of. Further, when the drain member 2 is driven to a predetermined depth in the soft ground 100, the drain device 2 is pulled up. Even if so-called co-raising occurs, the drain member 2 that has co-raised. Is pushed down again to a predetermined depth in the soft ground 100, and the drain member 2 can be reliably driven to a predetermined depth in the soft ground 100.

  Specifically, as shown in FIGS. 1 to 3, the driving device 1 includes a drain member 2 that transmits moisture in the soft ground 100, and an anchor member 3 that is connected to the distal end portion 2 a of the drain member 2. The anchor member 3 is disposed at the tip 4a, the drain member 2 is movably provided in the mandrel 4 inserted into the inside 4b, and the inside 4b of the mandrel 4, and protrudes from the tip 4a of the mandrel 4 to be anchored. And a rod member 5 for pressing the member 3.

  The drain member 2 that permeates moisture in the soft ground 100 is driven into the soft ground 100, and has flexibility and shape retention that can be wound around a reel as shown in FIG. And a filter 6b made of a water-permeable material covering the core material 6a. Thereby, the moisture which flowed in the hollow part 6c formed in the drain member 2 by the clearance gap between the core material 6a and the filter 6b is passed.

  The core material 6 a has a large number of grooves in the longitudinal direction, and the grooves serve as a water passage 9 for moisture in the soft ground 100. The core member 6a is flexible enough to be wound around a reel in consideration of convenience of transportation and the like, and has a shape retention for securing a sufficient water passage 9 after being placed on the soft ground 100. For example, it is made of a resin material such as plastic. More specifically, the core material 6a is made of a material such as vinyl chloride or polyethylene.

  The core material 6a is not limited to the above, and any material and shape can be used as long as the core material 6a has flexibility in consideration of convenience of transportation and the like and can retain the shape of the hollow portion 6c serving as the water passage 9. It may be. Further, the core material 6a is not limited to the above, and can be made environmentally friendly by being formed of a biodegradable resin material.

  The filter 6b is formed from a material having water permeability, and is formed so as to cover the outer periphery of the core material 6a leaving the hollow portion 6c. The filter 6b is formed of, for example, a non-woven fabric made of polyester, and allows moisture in the soft ground 100 to pass through the hollow portion 6c. The filter 6b is not limited to the above, and can be made environmentally friendly by being formed of a biodegradable resin material.

  As shown in FIG. 1, such a drain member 2 is wound around a drum-like reel 10 and disposed on the ground surface 101 of the soft ground 100. Further, a back tension is applied to the drain member 2 by the reel 10 or the like to prevent the drain member 2 from being loosened or entangled. Further, the amount of the drain member 2 drawn out of the reel 10 is measured by a measuring unit 12 such as a measuring device that measures the amount of rotation of the reel 10. Therefore, the operator or the like can easily grasp the position (depth) of the distal end portion 2a of the drain member 2 in the soft ground 100 by grasping the pull-out amount of the drain member 2 during the placing operation. . Here, since the back tension is applied to the drain member 2 by the reel 10 or the like, when the drain member 2 is lifted together, the drain member 2 is wound around the reel 10 without being loosened, and the amount of drawing is reduced. Therefore, the operator or the like can determine whether or not the drain member 2 has been lifted together by grasping the change in the amount of the drain member 2 after being driven to a predetermined depth in the soft ground 100 during the driving operation. Furthermore, it is possible to easily grasp how much the drain member 2 has risen together.

  The drain member 2 may be applied with a back tension by the conveyance guide unit 11 that guides the conveyance of the drain member 2 in addition to the application of the back tension by the reel 10. Further, the measurement unit 12 directly measures the rotation amount of the conveyance guide unit 11 and the length of the drain member 2 pulled out from the reel 10 in addition to the rotation amount of the reel 10, thereby determining the pull-out amount of the drain member 2. You may make it measure.

  Further, the drain member 2 is connected to the water permeable portion 6 that transmits moisture in the soft ground 100, and is formed in an annular shape by a water impermeable material such as vinyl chloride, and the inside has water permeability. You may use what has the impermeable part which interrupted | blocked ventilation | gas_flowing from the surrounding surface.

  As shown in FIG. 5, the anchor member 3 includes a main body portion 3 a and a connecting portion 3 b formed on one main surface of the main body portion 3 a and connected to the distal end portion 2 a of the drain member 2.

  The main body 3a of the anchor member 3 serves as an insertion end when the mandrel 4 is driven into the soft ground 100. For example, the anchor member 3 is formed in a substantially rectangular plate shape and is mechanical enough to be driven into the soft ground 100. The thickness is strong. Here, as shown in FIG. 3, the main body 3 a is formed such that the longitudinal direction is larger than the diameter of the mandrel 4 and the width direction is slightly smaller than the diameter of the mandrel 4.

  As shown in FIG. 5, the connecting portion 3 b of the anchor member 3 is formed in a substantially inverted U shape in a substantially central portion in the width direction of one main surface of the main body portion 3 a toward the longitudinal direction of the one main surface. ing. The connecting portion 3b is slightly longer than the length in the width direction of one main surface of the drain member 2, and a connecting port 3c to which the drain member 2 is connected is formed between the connecting portion 3b and the main body portion 3a. . The anchor member 3 having such a connection port 3c is folded after the lower end portion 2b of the drain member 2 is inserted through the connection port 3c, and is opposed to the lower end portion 2b of the drain member 2 with the connection portion 3b interposed therebetween. By being fastened to the member 2 by a fastening member 13 such as a stapler, the tip end 2a of the drain member 2 is connected.

  The main body 3a is not limited to the above, and may have any size as long as it has such a thickness that it can be placed on the soft ground 100. Any shape such as an elliptical shape or a polygonal shape may be used. Further, the connecting portion 3b is not limited to the above, and may have any shape as long as it can be connected to the drain member 2. Furthermore, the anchor member 3 and the drain member 2 are not limited to those described above, and any connection method may be used as long as they can be connected.

  As shown in FIGS. 1 and 3, the mandrel 4 is formed in a bottomed cylindrical shape having a substantially circular cross section. The mandrel 4 formed in a bottomed cylindrical shape has a base end portion 4c having a predetermined length from the ground surface 101 when the distal end portion 4a is driven from the ground surface 101 of the soft ground 100 to a predetermined depth. It has a total length that faces it.

  As shown in FIGS. 2 and 3, a drain opening 4 d through which the drain member 2 is inserted and a rod opening 4 f through which the rod member 5 is inserted are formed at the tip 4 a of the mandrel 4. ing. The drain opening 4d is formed in a substantially rectangular shape, is approximately the same size as or slightly larger than the connecting portion 3b of the drain member 2 and the anchor member 3, and is large enough to allow the connecting portion 3b of the drain member 2 and the anchor member 3 to be inserted. And is provided at a substantially central portion of the tip portion 4 a of the mandrel 4. The rod opening 4f is formed in a substantially circular shape and has a size that allows the rod member 5 to be inserted. One end side in the width direction of the drain opening 4d of the tip 4a of the mandrel 4 (one of the drain members 2). Main surface side).

  In such a mandrel 4, as shown in FIG. 1, the anchor member 3 connected to the distal end portion 2a of the drain member 2 inserted through the interior 4b is disposed outside the distal end portion 4a, and the rod member 5 is disposed in the inner 4b. It is stored in. As a result, the mandrel 4 is an assembly 14 in which the anchor member 3 is disposed at the distal end portion 4a, the drain member 2 is inserted into the interior 4b, and the rod member 5 is accommodated in the interior 4b. Such an assembly 14 is placed on the soft ground 100 by a placement machine 21 having a placement mechanism 21a such as a friction roller system with the anchor member 3 as an insertion end. At this time, in the assembly 14, the drain opening 4d and the rod opening 4f formed at the tip 4a of the mandrel 4 are covered with the anchor member 3, so that the drain opening 4d and the rod opening 4f It is possible to prevent the earth and sand of the soft ground 100 from entering the inside 4b of the mandrel 4.

  In addition, the mandrel 4 is not limited to the above, and the anchor member 3 can be disposed outside the distal end portion 4a of the mandrel 4 such as an elliptical shape, a rectangular shape, a polygonal shape, etc. As long as it can be stored in the interior 4b, it may have any shape.

  As shown in FIG. 1, the rod member 5 is formed in a columnar shape shorter than the length (full length) in the longitudinal direction of the mandrel 4, with the lower end 5 a directed toward the distal end 4 a of the mandrel 4, 4 b is provided so as to be movable in the longitudinal direction of the mandrel 4. Further, the rod member 5 is provided in the inside 4 b of the mandrel 4, for example, such that the lower end portion 5 a is inserted through the rod opening 4 f of the distal end portion 4 a of the mandrel 4 and is flush with the distal end portion 4 a of the mandrel 4. ing.

  Further, the rod member 5 has a wire 15 attached to the upper end portion 5 b and is suspended by the wire 15 to the inside 4 b of the mandrel 4. The wire 15 is inserted through the inside 4 b of the mandrel 4, exposed from the opening 4 e on the base end 4 c side of the mandrel 4, and connected to a winch 16 provided outside the mandrel 4, for example, on the ground surface 101. ing.

  Such a rod member 5 is moved to the front end 4 a side of the mandrel 4 by its own weight when the wire 15 is pulled out by the winch 16. Further, the rod member 5 is moved to the base end portion 4 c side of the mandrel 4 when the wire 15 is wound up by the winch 16. That is, the rod member 5 can move independently of the mandrel 4 by the winch 16 provided outside the mandrel 4.

  Furthermore, as described above, the rod member 5 moves toward the tip portion 4a side of the mandrel 4 by its own weight, so that a part of the lower end portion 5a can be protruded to the outside from the rod opening 4f. Furthermore, the rod member 5 can easily adjust the amount of protrusion that protrudes to the outside from the rod opening 4f by adjusting the amount of the wire 15 drawn from the winch 16. Thereby, the rod member 5 can press down the anchor member 3 of the drain member 2 raised together to push down to a predetermined depth in the soft ground 100.

  Further, back tension is applied to such a wire 15 by a winch 16 or the like to prevent the wire 15 from being loosened or entangled. Further, the amount of the wire 15 pulled out from the winch 16 is measured by a measuring unit 18 such as a measuring device that measures the amount of rotation of the winch 16. Therefore, the operator or the like can easily grasp the position (depth) of the rod member 5 in the soft ground 100 by grasping the pull-out amount of the wire 15 during the placing work.

  Note that the back tension may be applied to the wire 15 by the conveyance guide portion 17 that guides the conveyance of the wire 15 in addition to the back tension applied by the winch 16. Further, the measuring unit 18 directly measures the rotation amount of the conveyance guide unit 17 and the length of the wire 15 drawn from the winch 16 in addition to the rotation amount of the winch 16, thereby grasping the drawing amount of the wire 15. The position (depth) of the rod member 5 in the soft ground 100 may be grasped.

  The rod member 5 is not limited to being formed in a cylindrical shape, and may have any shape such as an elliptical column or a rectangular column.

  Next, a placement operation for placing the drain member 2 on the soft ground 100 using the placement apparatus 1 will be described with reference to FIG.

  First, in step S1, the assembly 14 is formed. Specifically, the lower end 2b of the drain member 2 is pulled out from the drum-shaped reel 10 around which the drain member 2 is wound. Then, the lower end portion 2b of the drain member 2 drawn out from the reel 10 is inserted into the inside 4b of the mandrel 4 from the opening 4e of the base end portion 4c of the mandrel 4, and the inside 4b of the mandrel 4 is inserted, so that the mandrel 4 It exposes from the drain opening part 4d of the front-end | tip part 4a. Then, as shown in FIG. 5, the lower end 2b of the drain member 2 exposed from the drain opening 4d is passed through the connecting port 3c of the anchor member 3, and then folded back to the lower end 2b of the drain member 2. It fastens with the fastening member 13, such as a stapler, to the drain member 2 which opposes on both sides of the connection part 3b. Thereby, the drain member 2 is connected with the anchor member 3 in the front-end | tip part 2a.

  Then, the drain member 2 connected to the anchor member 3 at the distal end portion 2 a is wound up by the reel 10, and the anchor member 3 is disposed outside the distal end portion 4 a of the mandrel 4 as shown in FIG. 1. Further, the rod member 5 is inserted from the opening 4 e of the base end portion 4 c of the mandrel 4 and provided in the inside 4 b of the mandrel 4. At this time, the rod member 5 is provided such that the lower end portion 5 a is inserted into the rod opening 4 f of the tip portion 4 a of the mandrel 4 and is flush with the tip portion 4 a of the mandrel 4. As described above, in the mandrel 4, the anchor member 3 is disposed outside the distal end portion 4a, the drain member 2 in which the anchor member 3 and the distal end portion 2a are connected is inserted into the inner 4b, and the rod member 5 is inserted into the inner 4b. The assembly 14 is housed in the housing.

  Next, in step S2, the assembly 14 of the mandrel 4 is driven. Specifically, as shown in FIG. 7 (A), the assembly 14 of the mandrel 4 is placed at a predetermined driving position, with the anchor member 3 as an insertion end, and the anchor member 3 (the distal end portion 2a of the drain member 2). Driving is performed from the ground surface 101 of the soft ground 100 to a predetermined depth in the soft ground 100. At this time, the mandrel 4 is driven on the soft ground 100 by the driving machine 21. The rod member 5 housed in the inside 4 b of the mandrel 4 is lowered into the soft ground 100 together with the mandrel 4 by the winch 16 so that the moving speed due to its own weight is substantially the same as the driving speed of the mandrel 4. At this time, the depth of the anchor member 3 (the tip 2a of the drain member 2) from the ground surface 101 is determined by the rotation amount of the friction roller of the driving mechanism 21a of the driving machine 21 or the drain measured by the measuring unit 12. It grasps | ascertains from the drawing amount of the member 2, the drawing amount of the wire 15 measured by the measurement part 18, etc.

  Next, in step S3, the mandrel 4 is pulled up. Specifically, as shown in FIG. 7B, only the mandrel 4 is pulled up by a predetermined distance by the driving machine 21. Then, as the mandrel 4 is pulled up, the rod member 5 protrudes to the outside from the rod opening 4f of the mandrel 4, and the lower end portion 5a presses the anchor member 3, so that the drain member 2 is placed in the soft ground 100. To a predetermined depth. At this time, the space between the anchor member 3 and the mandrel 4 formed by pulling up the mandrel 4 is filled with soil from the surroundings. Then, after the mandrel 4 is pulled up to a predetermined distance, the rod member 5 is pulled up by the winch 16 and stored in the inside 4b of the mandrel 4 as shown in FIG.

  Next, in step S4, it is detected whether the drain member 2 is raised together. Specifically, when the rod member 5 is pulled up from a predetermined depth in the soft ground 100, the change in the amount of the drain member 2 is detected by the measuring unit 12, so Detect the presence or absence.

  Here, FIGS. 8A and 8B show the locus of the position (depth) of the anchor member 3 (the tip 2a of the drain member 2), the mandrel 4, and the rod member 5 in the soft ground 100 with respect to time. Is shown. The vertical axis indicates the depth in the soft ground 100, and the horizontal axis indicates time. Furthermore, H1 on the vertical axis indicates the ground surface 101 of the soft ground 100, and H2 indicates a predetermined depth in the soft ground 100 to be placed. Furthermore, L1 (broken line) indicates the position (depth) of the anchor member 2 (the distal end portion 2a of the drain member 2) derived from the amount of the drain member 2 drawn from the reel 10 by the measuring unit 12 in the soft ground 100. ) Shows the locus with respect to time. L2 (thin solid line) indicates a locus with respect to time of the position (depth) of the mandrel 4 in the soft ground 100, which is derived from the rotation amount of the friction roller of the driving mechanism 21a of the driving machine 21. L3 (thick solid line) indicates a locus with respect to time of the position (depth) of the rod member 5 in the soft ground 100 derived from the amount of the wire 15 drawn from the winch 16 by the measuring unit 18.

  Then, as shown in FIG. 8A, the anchor member 3 (the distal end portion 2a of the drain member 2) until the rod member 5 is pulled out from the predetermined depth in the soft ground 100 to the ground surface 101 (t1). If there is no change in the depth of), it is determined that the drain member 2 has not risen together, and the process proceeds to step S6. Further, as shown by a locus L1a in FIG. 8B, when there is a change in the depth of the anchor member 3, the drain member 2 rises together as shown by an arrow A in FIG. 7C. Judge that In this case, the process proceeds to step S5, and the drain member 2 raised together is corrected.

  Next, in step S5, the co-raised drain member 2 is corrected. Specifically, as shown in FIG. 7B, the winch 16 is driven to pull out the wire 15, and the rod member 5 is moved to the distal end 4a side of the mandrel 4 by its own weight, so that the lower end 5a of the rod member 5 is obtained. A part of the side protrudes from the rod opening 4 f of the tip 4 a of the mandrel 4. Then, the anchor member 3 is pushed down to a predetermined depth in the soft ground 100 by the rod member 5. As a result, as indicated by a locus L1b in FIGS. 7B and 8B, the tip 2a of the drain member 2 is again at a predetermined depth in the soft ground 100 from the joint position. Placed in position.

  Then, as shown in FIG. 7C, the rod member 5 is pulled up by the winch 16 and stored in the inside 4 b of the mandrel 4. Then, the mandrel 4 is pulled up by the driving machine 21 and pulled out from the soft ground 100, and the rod member 5 is pulled up by the winch 16 together with the mandrel 4.

  Then, after the rod member 5 is housed in the inside 4b of the mandrel 4 and pulled out to the ground surface 101, for example, after the mandrel 4 is pulled up by the length of the rod member 5, the anchor member 3 (the drain member 2) If there is a change in the depth of the tip 2a), it is determined that the drain member 2 has risen together, and the drain member 2 that has risen together is corrected. Specifically, the lifting of the mandrel 4 and the rod member 5 is stopped. Then, the winch 16 is driven to pull out the wire 15, the rod member 5 is moved by its own weight to the distal end portion 4 a side of the mandrel 4, and the rod member 5 is projected from the rod opening 4 f of the distal end portion 4 a of the mandrel 4. Then, the anchor member 3 is pushed down to a predetermined depth in the soft ground 100 by the rod member 5. Thereby, as indicated by a locus L1c in FIG. 8B, the distal end portion 2a of the drain member 2 is disposed again at a predetermined depth in the soft ground 100 from the joint position. That is, even if the mandrel 4 is pulled up by the length of the rod member 5, the anchor member 3 can be pushed down to a predetermined depth in the soft ground 100 by the rod member 5 without lowering the mandrel 4 again.

  Then, the rod member 5 is pulled up by the winch 16 and stored in the inside 4 b of the mandrel 4. 7D, the mandrel 4 is pulled up by the driving machine 21 and pulled out from the soft ground 100. The mandrel 4 and the rod member 5 are pulled up by the winch 16 and pulled out from the soft ground 100. The process proceeds to step S6. Note that the mandrel 4 and the rod member 5 may be pulled out from the soft ground 100 while the rod member 5 is protruding without being housed in the inside 4 b of the mandrel 4.

  Next, in step S6, the upper end portion 2c of the drain member 2 is cut so as to face a predetermined length from the ground surface 101. In the drain member 2 placed as described above, the tip 2a to which the anchor member 3 is connected is located at a predetermined depth in the soft ground 100, and the upper end 2c is a predetermined length from the ground surface 101. It is buried to face. Thereafter, the process of step S1 to step S6 is repeated in order until it moves to a new placement position and places a predetermined number of drain members 2. Then, when a predetermined number of drain members 2 are driven, the driving operation is completed.

  Then, after the placement work is completed, the drainage member 2 is used to discharge moisture and the like of the soft ground 100 to consolidate the ground, and the ground is improved.

  In step S3, the anchor member 3 is pressed by the rod member 5 so that the drain member 2 does not rise together when the mandrel 4 is pulled up, but the present invention is not limited to this. After installation, the mandrel 4 and the rod member 5 may be lifted together without pressing the anchor member 3 with the rod member 5. In this case, in step S4, it is detected whether or not the drain member 2 is lifted up when the mandrel 4 and the rod member 5 are pulled up. When the drain member 2 is lifted up, the mandrel 4 and the rod member 5 are lifted up. Stop. In step S5, the drain member 2 raised together by the rod member 5 is corrected. According to such a driving method, the time for pressing the anchor member 3 by the rod member 5 can be shortened so that the drain member 2 does not rise together when the mandrel 4 is pulled up, thereby shortening the working time. Can do.

  Further, as shown in FIG. 1, the measuring unit 12, the measuring unit 18, the driving mechanism 21 a of the driving machine 21, and the winch 16 are connected to the measuring unit 12, the measuring unit 18, and the driving mechanism 21 a of the driving machine 21. For example, a control unit 19 configured by a computer or the like to which the measurement result measured in step S1 is input may be provided, and the control unit 19 may automatically perform steps S2 to S5.

  For example, in step S <b> 2, the control unit 19 drives the placement mechanism 21 a and the winch 16 of the placement machine 21 based on the measurement results of the measurement unit 12, the measurement unit 18, and the placement mechanism 21 a of the placement machine 20. Then, the assembly 14 is driven to a predetermined depth in the soft ground 100. In step S3, the controller 19 drives the driving mechanism 21a and the winch 16 of the driving machine 21 to pull up the mandrel 4 and the rod member 5. In step S4, the control unit 19 determines that the amount of change in the depth of the anchor member 3 (the distal end portion 2a of the drain member 2) is greater than or equal to a threshold value set in advance in the internal memory based on the measurement result of the measurement unit 12. When this happens, it is determined that the drain member 2 has risen together. In step S5, the control unit 19 drives the winch 16 based on the measurement results of the measurement unit 12 and the measurement unit 18, and pushes the anchor member 3 down to a predetermined depth of the soft ground 100 by the rod member 5. The drain member 2 is disposed at a predetermined depth of the soft ground 100. Then, the control unit 19 drives the driving mechanism 21 a and the winch 16 of the driving machine 21 to pull out the mandrel 4 and the rod member 5 from the soft ground 100.

  As described above, in the placement device 1 according to the present invention, the anchor member 3 is disposed at the distal end portion 4a of the mandrel 4, and the drain member 2 connected to the anchor member 3 at the distal end portion 2a is the interior 4b of the mandrel 4. The assembly 14 in a state where the rod member 5 is accommodated in the inside 4b of the mandrel 4 is driven to a predetermined depth in the soft ground 100 with the anchor member 3 as an insertion end, and the mandrel 4 and the rod member By pulling 5 out of the soft ground 100, the drain member 2 in which the anchor member 3 is connected to the tip 2a can be driven to a predetermined depth in the soft ground 100.

  Furthermore, even if the drain member 2 rises together when the mandrel 4 or the rod member 5 is pulled up from the soft ground 100, the driving device 1 according to the present invention drives the winch 16 to pull out the wire 15 and pull out the rod member. 5 is moved to the front end 4 a side of the mandrel 4 by its own weight, protrudes from the rod opening 4 f of the front end 4 a of the mandrel 4, and the anchor member 3 can be pushed down to a predetermined depth in the soft ground 100. Therefore, the placing device 1 according to the present invention can reliably place the drain member 2 to a predetermined depth in the soft ground 100.

  Furthermore, the driving device 1 according to the present invention has a winch 16 provided outside the mandrel 4, and is independent of the driving mechanism 21 a of the driving machine 21 that drives the mandrel 4 and independent of the mandrel 4. The member 5 can be driven. Therefore, the placement device 1 according to the present invention does not need to move the mandrel 4 downward again when correcting the joint rise of the drain member 2, so that the workability is improved and the construction period is shortened. Can be economical.

  Furthermore, since the driving device 1 according to the present invention has the winch 16 for driving the rod member 5 provided outside the mandrel 4, the internal structure of the mandrel 4 can be simplified and economically excellent. ing.

  Furthermore, in the placing device 1 according to the present invention, the amount of protrusion protruding from the rod opening 4f of the tip portion 4a of the mandrel 4 of the rod member 5 is determined according to the amount of extraction of the wire 15 drawn from the winch 16. By adjusting the drawing amount of the wire 15, the protruding amount of the rod member 5 can be easily adjusted. That is, the driving device 1 according to the present invention projects the rod member 5 from the rod opening 4f of the tip portion 4a of the mandrel 4 and projects the anchor member 3 softly without depending on the position of the mandrel 4. It can be pushed down to a predetermined depth in the ground 100.

  In addition, as shown in FIG. 9, you may make it the diameter of the front-end | tip part 4a side of the mandrel 4 reduce gradually as it goes to the front-end | tip part 4a side, in order to suppress the resistance with respect to the soft ground 100 during placement. At this time, the rod opening 4f may be provided in the inclined portion 4g.

  Further, as shown in FIG. 3, the anchor member 3 has a connecting portion 3b formed at a substantially central portion in the width direction of the main body portion 3a, and the main body portion 3a allows the drain opening portion 4d and the drain opening portion 4d in the width direction. It is not limited to covering the both ends of the front-end | tip part 4a of the mandrel 4 adjacent to. As shown in FIG. 10, the anchor member 3 is formed with the connecting portion 3b on one end side in the width direction rather than the substantially central portion in the width direction of the main body portion 3a, and the drain opening 4d and the drain are formed by the main body portion 3a. You may make it cover only the one end part of the front-end | tip part 4a of the mandrel 4 in which the rod opening part 4f was formed adjacent to the width direction of the opening part 4d. Such an anchor member 3 can reduce the length in the width direction of the main body portion 3a because it does not cover the other end portion of the tip portion 4a of the mandrel 4 adjacent in the width direction of the drain opening 4d. Excellent in properties.

  Furthermore, the rod member 5 is not limited to being provided on the one main surface side of the drain member 2 in the inside 4 b of the mandrel 4, for example, one on each main surface side of the drain member 2, A plurality of them may be provided on one principal surface side or a plurality of them on both principal surface sides. At this time, each rod member 5 may be driven independently by the winch 16. As a result, the rod member 5 presses the anchor member 3 of the drain member 2 raised together and pushes it down to a predetermined depth in the soft ground 100, and also makes the anchor member 3 tilted during the rise upward become horizontal. Can be modified as follows. Further, the rod member 5 may be such that the lower end portion 5a side is separated into a plurality of pieces.

  Furthermore, as shown in FIG. 11, a guide member 20 that guides the movement of the rod member 5 may be provided in the inside 4 b of the mandrel 4. This guide member 20 is comprised by the bracket etc., for example, and the rod member 5 is penetrated. Further, when the rod member 5 is housed in the inner part 4b of the mandrel 4 so that the lower end part 5a is flush with the tip part 4a of the mandrel 4, the guide member 20 has a lower end part 5a vicinity and an upper end part. It is provided at a position corresponding to the vicinity of the portion 5b. That is, the guide member 20 includes a lower end guide member 20a provided at a position corresponding to the vicinity of the lower end portion 5a of the rod member 5 and an upper end guide member 20b provided at a position corresponding to the vicinity of the upper end portion 5b of the rod member 5. It is configured. Such a guide member 20 guides the movement of the rod member 5 and supports the rod member 5 to prevent the rod member 5 from wobbling.

  Furthermore, the guide member 20 may be provided in the inside 4b of the mandrel 4 on the base end portion 4c side with respect to the upper end portion 5b of the rod member 5, and the wire 15 may be inserted therethrough. Thereby, the guide member 20 can prevent the wire 15 and the drain member 2 from contacting, and the drain member 2 can be prevented from being damaged.

  Furthermore, an engaging portion 5d that engages with the lower end guide member 20a and the upper end guide member 20b may be provided on the outer peripheral surface 5c of the rod member 5. At this time, the engaging portion 5d is provided between the lower end guide member 20a and the upper end guide member 20b.

  Thereby, when the rod member 5 moves to the front end portion 4a side of the mandrel 4, the lower end guide member 20a is engaged with the engaging portion 5d, so that the rod member 5 is detached from the front end portion 4a of the mandrel 4. To prevent that. That is, the lower end guide member 20 a functions as a drop-off preventing portion for the rod member 5. Furthermore, the upper end guide member 20b regulates the movement of the mandrel 4 on the base end part 4c side by engaging with the engaging part 5d when the rod member 5 moves to the base end part 4c side of the mandrel 4. The slipping out of the guide member 20 is prevented. That is, the upper end guide member 20 b functions as a retaining portion for the rod member 5.

  Further, the upper end guide member 20b is engaged with the engaging portion 5d of the rod member 5 when the assembly 14 is driven, so that the mandrel 4 is driven and the rod member 5 is moved by the driving machine 21. Can be lowered.

  The guide member 20 is not limited to the lower end guide member 20a and the upper end guide member 20b, and only the lower end guide member 20a may be provided, or only the upper end guide member 20b is provided. You may do it. Furthermore, the guide member 20 may be configured by a tubular member such as a pipe.

DESCRIPTION OF SYMBOLS 1 Placing device, 2 drain member, 2a tip part, 2b lower end part, 2c upper end part, 3 anchor member, 3a main body part, 3b connection part, 3c connection port, 4 mandrel, 4a tip part, 4b inside, 4c base end Part, 4d drain opening part, 4e opening part, 4f rod opening part, 4g inclined part, 5 rod member, 5a lower end part, 5b upper end part, 5c outer peripheral surface, 5d engagement part, 6a core material, 6b filter, 6c hollow Part, 9 water passage, 10 reel, 11 transport guide part, 12 measuring part, 13 fastening member, 14 assembly, 15 wire, 16 winch, 17 transport guide part, 18 measuring part, 19 control part, 20 guide member, 20a Lower end guide member, 20b Upper end guide member, 21 Placing machine, 21a, Placing mechanism, 100 Soft ground, 101 Ground surface

Claims (10)

A drain member that penetrates moisture in soft ground;
An anchor member coupled to the tip of the drain member;
The anchor member is disposed at the distal end, and the mandrel into which the drain member is inserted,
A rod member that is movably provided inside the mandrel and protrudes from the mandrel and presses the anchor member;
The anchor member is disposed at the distal end portion, the drain member is inserted into the inside, and the mandrel in a state in which the rod member is housed therein is used as the insertion end to the predetermined depth in the soft ground. The mandrel and the rod member, which have been driven to a predetermined depth in the soft ground, are pulled up from the predetermined depth in the soft ground and pulled out from the soft ground, and the drain member is pulled out to a predetermined depth in the soft ground. Driving to depth,
When the drain member rises together when driving the drain member to a predetermined depth in the soft ground, the rod member protrudes from the mandrel and pushes the anchor member down to a predetermined depth in the soft ground. A drain member placing apparatus for placing the drain member to a predetermined depth in a soft ground.   2. The drain member driving device according to claim 1, wherein the mandrel is moved by a mandrel driving unit, and the rod member is moved by a rod driving unit.   The drain member driving device according to claim 2, wherein the rod driving section is provided outside the mandrel. The rod driving unit is a winch,
4. The rod member is suspended inside the mandrel by a wire drawn from the winch, and further protrudes from the mandrel by its own weight when the wire is further drawn from the winch. The drain member placing device according to claim.   The drain member driving device according to any one of claims 1 to 4, wherein the rod member is guided by a guide member provided inside the mandrel. The rod member has an engaging portion that engages with the guide member on an outer peripheral surface;
6. The apparatus for driving a drain member according to claim 5, wherein the engaging portion is engaged with the guide member to restrict movement of the rod member toward the tip end side. The rod member has an engaging portion that engages with the guide member on an outer peripheral surface;
7. The drain member placing device according to claim 5, wherein the engaging portion restricts movement of the rod member toward the proximal end portion by engaging with the guide member. .   The drain member placing device according to any one of claims 1 to 7, wherein at least one rod member is provided on one main surface side of the drain member.   The drain member placing device according to any one of claims 1 to 7, wherein at least one rod member is provided on each main surface side of the drain member. An anchor member is disposed at the tip, allows moisture in the soft ground to pass through, a drain member connected to the tip is inserted into the inside, and the mandrel with the rod member housed therein is Using the anchor member as an insertion end, the anchor member is driven to a predetermined depth in the soft ground, and the mandrel and rod member driven to the predetermined depth in the soft ground are pulled up from the predetermined depth in the soft ground to soften Pull out from the ground, and drive the drain member to a predetermined depth in the soft ground,
When the drain member rises together when driving the drain member to a predetermined depth in the soft ground, the rod member protrudes from the mandrel and pushes the anchor member down to a predetermined depth in the soft ground. The drain member is cast to a predetermined depth in the soft ground, and the drain member is cast.

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