JP4363996B2 - Ground improvement method - Google Patents

Description

The present invention is particularly a plastic drain material was Da設the ground vertically, is the moisture in the soil relates to ground improvement construction method for increasing discharged through the drain member.

  For ground improvement, for example, as an alternative to the sand drain method, a paper drain or board is used in which plastic drain material is placed in soft ground, and moisture in the ground rises and discharges to the ground surface through the plastic drain material. There is a ground improvement method called the drain method. FIG. 5 shows a device disclosed in Patent Document 1 as an apparatus used in the ground improvement method. The main part of the apparatus is provided on the self-propelled carriage 50 and is placed in a pipe of the driving pipe 52 via a driving pipe (driving bar) 52 supported by a standing guide means 51 having a tower structure, a supply reel, and the like. It has a drain material (not shown) to be inserted, a main driving device 53 for a driving tube, and an auxiliary driving device 54 thereon. In addition, the plastic drain material is inserted into the tube of the placement tube 52, and an anchor material is attached to the lower end side protruding from the tube lower opening. Then, the driving tube 52 is driven to the design depth by the main driving device 53 and / or the auxiliary driving device 54 and then pulled out, thereby enabling the drain material to be installed in the vertical direction of the ground.

  Here, the main driving device 53 includes a left-side fixed position roller 55 and a right-side displacement roller 56 which are provided so as to be able to approach and separate from each other with a transition path for the placement pipe in the standing guide means 51, and a chain transmission to each roller. It is composed of a rotational drive device 57 such as a motor for applying a rotational force, and the rollers 55 and 56 sandwich the placement tube 52, and the placement tube 52 is driven or pulled out by a frictional force caused by the rotation of the roller.

The auxiliary driving device 54 is provided in a state of being fixedly supported on the standing guide means 51 side, and vertically disposed cylinders 60 and 60 for driving the lifting platform 61, and the lifting platform 61 sandwiching the transition path of the placing tube 52. Cylinders 62, 62 provided at the left and right locations, and chuck pieces 63, 63 attached to the respective cylinders 62, 62 and capable of sandwiching the placing tube 52 by driving of the cylinders. Is configured to drive the placement tube 52 in accordance with the descending amount of the cylinders 61 and 61 from the state where the placement tube 52 is sandwiched.
Japanese Utility Model Publication No. 63-823

  In the above-described conventional apparatus, when the driving tube 52 hits the hard portion on the ground side and cannot be driven by the idle rotation of the roller of the main driving device 53, the driving tube 52 can be further driven by the auxiliary driving device 54. However, in this structure, even if the elevating cylinder has a high output, if the penetration resistance of the placement tube 52 into the ground increases, the self-propelled carriage 50 that is a moving body tilts and falls due to the reaction force received from the ground side. There is a risk of doing. Such a problem becomes more conspicuous when the moving body is in the form of a trolley or a float floating on the water. In addition, as a countermeasure, for example, before the placement tube 52 is placed, a steel material is driven by a vibration mechanism to perform advance penetration, but work efficiency is deteriorated.

  An object of the present invention is to devise a penetration assisting device that compensates the penetration input of the driving device with respect to the placement pipe in order to solve the above-described problems, and there is a possibility that the moving body may tilt or fall due to a reaction force received from the ground side. The object is to achieve the driving to the hard part on the ground side reliably and easily.

The invention of claim 1 is provided on a movable body such as a self-propelled carriage or a carriage, and has a placement pipe, a plastic drain material inserted into the placement pipe, and a placement device. In the ground improvement method in which the drain material is installed in the ground vertical direction by pulling out the placement pipe after the placement pipe is penetrated in the ground vertical direction by the driving device, it is detachable around the pipe of the placement pipe a receiving member which protrudes into the pipe diameter direction are combined, and the weight member is moved along the tube up and down direction of the punching設管 through the through-hole, said weight member along the punching設管on movement And at least a lifting means that can drop onto the receiving member after moving upward, and the weight member is freely dropped from a predetermined height by the lifting means and hits the receiving member against the hard portion on the ground side It said by the load 設管 that the features the it to penetrate to the ground.

Predetermined height above the onset Ming, the penetration initial and penetration during the punching設管is into the ground, for example, when a penetration impossible by driving against the rigid portion of the ground-side apparatus, hitting the weight member設管It is intended to promote the penetration of the placing tube into the ground by the impact load of the weight member. The collision load causes the weight member to fall freely, so that it is difficult to transmit to the moving body side even if the placing pipe receives excessive penetration resistance from the ground. The possibility of tilting or overturning due to the reaction force received from the ground side through the like can be eliminated. In other words, the onset Ming, as penetration force for hitting設管, since the present invention utilizes the collision load at the time of free fall of the weight member, negligible influence on the mobile with photons. The value of the penetration input or the impact load can be arbitrarily set by setting the weight of the weight member, the drop height, or the like. As a driving device, for example, a driving tube supported by an upright guide means is sandwiched between rollers as in the prior art, and the driving tube is inserted or pulled out by a frictional force generated by roller rotation. I just need it.

In the above present invention construction method, in particular, ground in aspects of easy Theissen and float fall tilting reaction force which the mobile receives from the ground side, the droplet設管by collision load when the free-fall of the weight member The reaction force applied to the moving body side can be minimized by penetrating into the moving body, and the problems such as the overturning of the moving body mentioned as problems can be solved reliably and easily.

  A preferred embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram showing the ground improvement method and the entire apparatus, FIG. 2 is a schematic view of the receiving member as seen from above, and FIG. 3 is a schematic operation view of the weight member and its lifting means as seen from the side. FIG. 4 is a schematic configuration diagram showing another example of the lifting means corresponding to FIG.

  The ground improvement device of FIG. 1 includes a placing pipe 3 supported on a moving body 1 via a standing guide means 2, a plastic drain material 4 inserted into the pipe of the placing pipe 3, and a standing guide. A driving device 5 which is installed on the lower side of the means 2 and penetrates or pulls the driving tube 3 into the ground m (where m1 indicates a hard portion of the ground) of the water bottom (including the seabed); An intrusion assisting device 6 is provided, and an operation chamber 7 for moving the moving body 1 to an appropriate position in the construction area or driving the driving device 5 or the intrusion assisting device 6 is provided. In this device, the driving tube 3 supported by the standing guide means 2 is penetrated in the vertical direction of the ground by the driving device 5 and / or the penetration assisting device 6, and then the driving tube 3 is pulled out by the driving device 5. Thus, the drain material 4 is installed (remaining) in the vertical direction of the ground, and is used in a ground improvement method called a paper drain or a board drain method.

  Here, the movable body 1 should just be what can mount an apparatus structural member and can move on a construction area. Although the illustrated moving body 1 is assumed to be a floating float or trolley for water, it may be a self-propelled trolley for land as illustrated in FIG. The movable body 1 is provided with a holding plate 11 substantially horizontally via a plurality of support members 12. On the holding plate 11, the standing guide means 2, the driving device 5, and the penetration assisting device 6 are provided on one end side, the operation chamber 7 is provided on the other end side, and the supply reel 14 for supplying the drain material 4 is provided. Are provided at appropriate locations. The standing guide means 2 has a tower structure that supports the placing tube 3 so as to be movable up and down, and is held by a frame-like base body 15 that is fixed to the holding plate 11 so as to protrude from one side. (A portion 15a) is reinforced and supported by a wire member 13 such as a wire. Guide means 16 for introducing and guiding the plastic drain material 4 drawn from the supply reel 14 to the upper opening of the placing tube 3 is provided at the top of the tower. For example, the drain material 4 is inserted into the placement tube 3 from the supply reel 14 via the guide means 16, and the lower end thereof is led out from the lower opening of the placement tube 3. It is attached.

  Inside the base body 15, rollers 5 a and 5 b are provided so as to be able to approach and separate with a placement pipe transfer path interposed therebetween. The rollers 5a and 5b constitute a main part of the driving device 5 and are rotationally controlled via a driving roller (not shown) to move the driving tube 3 down and up. Such a driving device 5 is the same as or similar to the conventional mechanism, and has a structure in which when the driving tube 3 penetrates into the ground, the penetration resistance of the driving tube 3 is applied as a reaction force to the movable body 1 side. .

  The penetration assisting device 6 is inclined such that when the driving tube 3 becomes unable to penetrate due to insufficient output of the driving device 5 or when the movable body 1 penetrates the driving tube 3 by the driving device 5, it receives an excessive reaction force. In some cases, the penetration input to the placing tube 3 is reinforced by a drop impact force that does not exert a reaction force on the moving body 1 side. In this example, a receiving member 7 that is detachably coupled to the periphery of the placing tube 3 and projects in the radial direction of the tube, a weight member 8 that is arranged to be movable up and down with respect to the placing tube 3, and a weight member Lifting means 9 for moving 8 upward along the placing tube 3 is provided.

  The receiving member 7 is detachably coupled to the periphery of the placing tube 3 and protrudes in the tube radial direction to receive the collision load of the weight member 8 that is dropped. In this example, as shown in FIG. 2, the sandwiching pieces 18 and 18 are arranged to face each other, and a pair of screw members 19 and 19 that approach or separate the sandwiching pieces. Each clamping piece 18 has a substantially U-shaped engaging groove 18 a, and the engaging groove 18 a engages with the rectangular corresponding portion of the placing tube 3. Each clamping piece 18 is attached to and integrated with the casting tube 3 with a predetermined coupling force by rotating the screw members 19 and 19 on both sides, and is attached to the casting tube 3 by reverse rotation of the screw members 19 and 19. However, the position can be arbitrarily moved. Such a receiving member 7 may increase the coupling force by, for example, attaching a plurality of engaging grooves, which are engaged with and disengaging from the engaging groove 18a, to the placing tube 3 in the vertical direction. Of course, the receiving member 7 is not limited to this example. For example, the receiving member 7 may have a chuck structure that can be attached to and detached from the periphery of the placing tube 3 by a cylinder mechanism or the like.

  The weight member 8 has a rectangular upper and lower through-hole 8a at the center, and is slidable and skewered through the through-hole 8a with respect to the placing tube 3 and freely dropped onto the receiving member 7. A downward collision load is applied to the placing tube 3 by the above.

  The lifting means 9 may be configured to be able to drop the weight member 8 after moving the weight member 8 along the placement tube 3. As a specific example, the lifting means 9 in FIGS. 1 and 3 has a structure in which the weight member 8 is lifted by a pulley 22 and a wire 24 or the like by being incorporated in a rod 20 standing on the upper member 15a of the base 15. In this case, a pulley 22 is held on the top of the rod 20 via a hanging tool 21. A wire 24 guided upward through a lower pulley 23 is hung on the pulley 22. That is, one end 24a side of the wire 24 passes from the pulley 23 through the pulley 22 and is locked to the weight member 8, and the other end 24b side of the pulley 23 side is pulled as shown in FIG. By moving and releasing the pulling force, the weight member 8 is dropped onto the receiving member 7 as shown in FIG.

  On the other hand, the lifting means 10 in FIG. 4 has a structure in which the weight member 8 is moved up by a predetermined height along the placing tube 3 by the piston type cylinder 25. In this case, the weight member 8 is provided with a plurality of hooking claw portions 8c projecting from the circumferentially equal position. On the base 15, a holding frame 17 is rotatably provided by a predetermined angle, and each cylinder 25 is erected with respect to the holding frame 17. Each cylinder 25 is configured to extend and contract the piston rod 16b with respect to the case 16a by a hydraulic mechanism, for example, and the tip of the piston rod 16b is bent horizontally. Each cylinder 25 extends the piston rod 16b in a state where each bent portion 16c is hooked on the corresponding claw portion 8c of the weight member 8 as shown in FIG. Move up along. In this structure, when the holding frame 17 is rotated by a predetermined angle after the weight member 8 is lifted to a predetermined height, the bent portion 16c of the piston rod 16b is detached from the claw portion 8c. Then, since the weight member 8 is released from being held by the cylinder 25, the weight member 8 falls freely and applies a downward collision load to the placing tube 3 via the receiving member 7.

Next, a ground improvement method called a paper drain or a board drain method using the above ground improvement device will be described with reference to the example of FIG. Incidentally, ground m the subject is underwater, it is assumed that the ground surface has been treated to a relatively hard hard transforming portion m1. In this example, the driving tube 3 is first lowered to the bottom of the water as shown in FIG. 1A by driving the driving device 5. Thereafter, the receiving member 7 is attached to an appropriate position of the placing tube 3, that is, a position in consideration of the distance to the weight member 8 described above, and the pulling force on the other end side of the wire 24 that suspends the weight member 8 is applied. release. Then, the weight member 8 falls freely and collides with the receiving member 7, and applies a downward collision load to the placing tube 3. The placement tube 3 is lowered by the collision load as shown in FIG. 1B and penetrates the hard part m1. Thereafter, the driving tube 5 is penetrated to a target depth by the driving device 5. The dropping operation of the weight member 8 is not limited to once, and may be repeated a plurality of times. As shown in (c) of FIG. 1, the driving tube 3 reaches the target depth, and then the drain material 4 in the tube is cut to the target length, and the driving device 5 is reversely rotated. The draining operation is performed, and the drain material 4 is installed (leaved) in the ground by this extraction. As described above, except for the penetration assisting device 6, the operation procedure of the ground improvement method is the same as the conventional one. In the present invention, by devising the penetration assisting device 6 or 10, the load applied to the moving body 1 side is greatly suppressed, and the possibility of the moving body falling or the like can be eliminated.

Invention construction method and device structure is a schematic view showing a. It is a model top view which shows the receiving member which comprises the penetration assistance apparatus of FIG. It is a typical operation | movement figure which shows the weight member and lifting means which comprise the penetration assistance apparatus of FIG. It is a schematic diagram which shows the said modification corresponding to FIG. It is explanatory drawing which shows the example of a conventional apparatus.

1 ... moving body (11 is a holding plate, 15 is a substrate)
2 ... Standing guide means 3 ... Placing pipe 4 ... Plastic drain material (14 is a supply reel)
5 ... Driving devices 6, 10 ... Penetration assisting device 7 ... Receiving member 8 ... Weight members 9, 16 ... Lifting means

Claims (1)

A driving pipe, a plastic drain material and a driving device which are provided on a movable body such as a self-propelled carriage or a carriage, and are inserted into the driving pipe; and driving the driving pipe In the ground improvement method of installing the drain material in the vertical direction of the ground by pulling out the placing pipe after penetrating in the vertical direction of the ground by the device,
A receiving member that is detachably coupled around the tube of the placement tube and projects in the radial direction of the tube, a weight member that moves along the vertical direction of the tube of the placement tube through a through hole, and the weight member At least a lifting means that can move upward along the placement tube and drop onto the receiving member after the upward movement, and the weight member is raised to a predetermined height by the lifting means with respect to the hard portion on the ground side. A ground improvement construction method characterized in that the placement pipe penetrates into the ground due to a collision load that falls freely from the ground and hits the receiving member.

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