JP2010236354A - Installation method of horizontal drain material for improving soft ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an installation method of horizontal drain material for improving a soft ground capable of reducing works at a construction site and horizontally installing a horizontal drain material economically and effectively. <P>SOLUTION: An installation method of horizontal drain material is that a prescribed quantity of drain materials 10 which is to be installed in a horizontal direction is one unit as a drain material unit A, the drain material unit A which is connected with a prescribed interval length between the drained materials adjacent each other via drain material connectors 11 which correspond to a desired installation interval length is used, the drain material unit A is winded as a roll state that the interval of the connected drain materials 10 is shorter than the installation interval, is carried in the installation site in the rolled state of being winded, and, while the drain material unit which is winded in the rolled state is winded back and the edge of the drain material unit is drawn out, the drain material unit is drawn out to the surface of the soft ground by widening the interval of the drain material to the same length of the drain material connectors. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is for soft ground improvement to improve soft soil storing dredged soil with a pump-type dredger and slurry-like waste discharged from a chemical factory by a horizontal drain consolidation method. The present invention relates to a horizontal drain material laying method.

  Generally, from the viewpoint of environmental protection, a new disposal site for dredged soil cannot be secured recently. However, on the other hand, a large amount of dredged soil has been generated for the purpose of securing the water depth in the channel and anchorage area. Therefore, it would be advantageous if the dredged material could be disposed of as much as possible in a limited disposal site.

  As a disposal result of such dredged soil, using a drain material buried ship in soft soil in the disposal site where dredged clay has been thrown in, multistage and horizontally, for example, about 0.7 to 1.5 m There is a vacuum consolidation improvement method (Laterald lane method) in which drain materials are buried at equal horizontal intervals and negative pressure is applied to soft soil (clay) through the buried drain materials (for example, Patent Document 1).

  The conventional horizontal drain material burial in this construction method is assembling a dedicated burial ship at the disposal site, penetrating the mandrel from the trolley to a predetermined depth in the ground, and moving the trolley in that state. In general, a method of laying the drain material by unwinding it from the mandrel in accordance with the movement is common.

  In such a conventional horizontal drain material laying method, when the disposal site is narrow, the ratio of the production cost of the drain material burying base ship in the total construction cost increases, and the ground improvement cost per unit volume increases. There is a problem.

  As a method for solving such a problem, after dredging the dredged soil into a disposal site of a limited area, a drain material is laid horizontally on the soft soil surface at regular intervals, and further on it. There is a method of burying drain material in upper and lower multi-stage arrangement by repeating the work of throwing dredged soil at a predetermined depth and reducing the volume of soft soil at an early stage by reducing the pressure through the drain material, thereby increasing the amount of dredged soil treated. is there.

  In this method, when there are a plurality of dredged soil disposal sites, there is a period during which no dredged soil is put in. Therefore, the drain material can be laid on the entire surface of the ground at regular intervals within this period. However, laying one drain material at a time is very inefficient. In addition, when dredged clay is put again on the drain material that has been laid, due to its weight, the interval between the drain materials changes greatly, and it may be difficult to perform uniform ground improvement.

  As a solution to this problem, the drain materials adjacent to each other are connected in advance by means of an inter-drain material connector, and the drain material is prevented from spreading beyond a certain level, and is drawn out and laid on the surface of soft soil. There is a method (for example, Patent Document 2).

JP-A-11-336064 Japanese Patent Laid-Open No. 5-230823

    The method of drawing out the above-described conventional drain material connected in advance with the drain material connecting tool is to adjust the drain material to a predetermined laying interval with respect to the support shaft having a length over the entire width laid in one operation. Since it is laid by pulling out these tips at the same time, the equipment becomes large and the length of the support shaft is long, so it is not possible to carry in the whole assembled in the factory in advance, on site The number of work man-hours increased and was inefficient.

  In view of such a conventional problem, the present invention has been made for the purpose of providing a horizontal drain material laying method for improving soft ground that is economical and efficient with less work on a construction site.

  The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving the intended purpose is that after soft soil such as viscous clay is thrown into the disposal site to a predetermined depth, A large number of drainage materials for ground improvement are laid out at a predetermined interval on the soft soil that has been thrown in the horizontal direction. In the horizontal ground material laying method for soft ground improvement in which the drain material is laid in soft soil, the drain material laid in the horizontal direction has a predetermined number as a unit, and between the adjacent drain materials. Using a drain material unit connected for each predetermined length via a connecting member between drain materials having a length corresponding to a desired laying interval, and connecting the drain material unit to the interval between the drain materials connected to each other. Between laying Wrapped in a roll in a state narrower than the gap, the drain material unit is carried into the laying site in a state wound in a roll, and the drain material unit wound in the roll is unwound and its tip is The drain material interval is widened to the length of the connecting member between the drain materials while the material is pulled out, and is drawn out on the soft soil surface.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the drain material units are laid next to each other, and the connection between the drain material units of each drain material unit is connected via the inter-unit connection tool. There is to do.

  The feature of the invention described in claim 3 is that, in addition to the configuration of claim 1 or 2, the inter-drain material connector for connecting the drain materials is fitted to the outer periphery of each drain material. There exists in being comprised from the ring-shaped fitting tool and the string-like material which connects between this fitting tool.

  According to a fourth aspect of the invention, in addition to the configuration of the second aspect, the inter-unit connector includes a cord-like material fixed to each drain-material inter-connector at the drain material unit edge, and the cord-like material. It is comprised with the binding tool connected with the front-end | tip of material, and it exists in connecting between drain material units by engaging the said fastening tool mutually between the drain material units mutually adjacent.

  According to a fifth aspect of the present invention, in addition to the configuration of any one of the first to fourth aspects, when the drain material unit wound in the roll shape is unwound and the tip is pulled out, The tip of each drain material constituting the drain material unit is fixed to a drawer jig extending in the width direction of the drain material unit provided with wheels at regular intervals, and the drawer jig is fixed by a winch through a rope. There is to pull out.

  In the present invention, as described above, the drain material laid in the horizontal direction has a predetermined number as one unit, and a drain having a length corresponding to a desired laying interval between the adjacent drain materials. Using a drain material unit connected at every predetermined length via an inter-material connector, winding the drain material unit in a roll shape with the interval between the drain materials connected to each other being narrower than the laying interval. The drain material unit is carried into the laying site while being wound in a roll shape, and the length of the connecting member between the drain materials is unwound by unwinding the drain material unit wound in the roll shape and pulling out its tip. Since the drain material interval is widened and pulled out on the soft soil surface, the drain material unit can be pre-assembled at the factory and carried into the field. Because, field work is reduced, it can be efficiently laid.

  In the present invention, the drain material units are installed next to each other, and the connection between the drain material units of each drain material unit is connected via the inter-unit connection tool. The drain material can be laid in a state of being connected at a predetermined interval.

  Further, in the present invention, the inter-drain material coupling tool for coupling the drain materials is composed of a ring-shaped fitting that is fitted to the outer periphery of each drain material, and a string-like material that couples the fittings. This facilitates the connection work between the drain materials.

  Further, in the present invention, the inter-unit connector is constituted by a string-like material fixed to each drain-material inter-connector at the drain material unit edge, and a binding tool connected to the tip of the string-like material, By connecting the drainage unit units between the adjacent drainage unit units by engaging the binding devices with each other, the connecting operation between the units is facilitated.

  Further, in the present invention, when the drain material unit wound in the roll shape is unwound and the tip is pulled out, the tip of each drain material constituting the drain material unit is arranged in the drain material unit width direction. The laying operation is quick and easy by fixing to the extending drawer jig and pulling out the drawer jig with a winch through a rope.

It is a top view which shows the outline of the horizontal drain material laying method for soft ground improvement concerning this invention. It is a disassembled perspective view of an example of the drain material connection tool which comprises the drain material unit used for this invention. It is a fragmentary perspective view of the state which fixed the connection tool between units to the drain material connection tool. It is a partial abbreviation top view of an example of the drain material used for the method of the present invention. It is a top view which shows the assembly process of the drain material unit used for this invention. It is a top view which shows the state after completion of drain material laying by this invention.

  Next, embodiments of the present invention will be described based on examples shown in the drawings. In the figure, symbol A indicates a drain material unit used in the method of the present invention. The drain material unit A includes a predetermined number of, for example, about 10 drain materials 10, 10,... And a number of drain material connectors 11, 11 that connect the drain materials 10, 10 adjacent to each other. It consists of ...

  Although not shown in detail in the drawing, a drainage material in the longitudinal direction is formed in the drain material 10 by pasting a cloth-like water-permeable material on both surfaces of a belt-like core material having a zigzag cross section. In addition, a so-called plastic board drain material that allows the water to permeate and allows external water to flow into the water passage holes is used. The length can be set to an arbitrary length of about 100 m to 300 m. In addition, as the drain material 10, in addition to those having a rectangular cross-sectional shape, circular and other cross-sectional shapes can also be used.

  As shown in FIG. 2, the drain member connecting tool 11 is composed of a ring-shaped fitting tool 12 that is fitted to the outer periphery of the drain material 10 and a string-like material 13 that connects the fitting tools 12. Yes. As this string-like material, a material having water permeability can be used. The fitting 12 is composed of halves 14 and 14 each having a ring-shaped shape, that is, a shallow saddle-like shape, and the halves 14 and 14 are formed on both sides of the drain material 10 at the center. Are fitted on the outer periphery of the drain member 10 by fixing the two edges to each other at the center of the side surface of the drain member 10.

  In this example, flanges 15 and 15 are integrally formed on both edges of each half body 14, and the other flanges are fixed to each other by heat welding.

  The two halves 14 and 14 may be joined by using an adhesive in addition to the above-mentioned heat welding. In addition to the joint between the flanges, an engaging claw is projected from one half. The two halves may be coupled by forming an engaging portion to which the other half is engaged in the other half.

  Polypropylene sling rope is used for the string-like material 13, and when the flanges 15 and 15 are welded to each other between the halves described above, the ends are inserted by sandwiching the ends between them. It is fixed to the tool 12. Thus, by fixing the both ends of the string-like material 13 to the fittings 12 and 12 fitted to the drain materials 10 and 10 adjacent to each other, the interval between the drain materials 10 and 10 is a certain length or more. To prevent it from spreading.

  In this way, by connecting the drain materials 10 and 10 adjacent to each other by the inter-drain material connector 11, the drain material unit having a drain material interval of about 0.7 to 1.5 m and a total width of about 10 to 20 m. A is formed.

  A large number of drain material connecting tools 11 are installed in the length direction of the drain material 10 with an arbitrary interval of about 5 to 10 m, and the drain material connecting tools 11 and the drain material 10 form a grid-like drain material unit. A is configured.

  Inter-unit connectors 17 for connecting the drain material units A laid next to each other are attached to the fittings 12 at both edges of the drain material unit A.

  The inter-unit connector 17 includes a string-like material 18 that is the same material as the string-like material 13 and has a half length, and a fastening tool 19 fixed to one end thereof. The end is fixed to the fitting 12 in the same manner as the string-like material 13 described above. As shown in FIG. 3, a shackle composed of a U-shaped main body portion 19a and bolts 19b penetrating across both ends of the main body portion 19a can be used as the binding tool 19, and the string-like material 18 A ring-shaped portion 18a is formed by folding and sewing the tip of the wire, and the main body portion 19a is passed through the ring-shaped portion and passed through the bolt 19b to be fastened, thereby connecting the two string-shaped members 18 and 18 together. Like to do.

  As long as the binding tool 19 can be easily connected between the string-like members 18 and 18 and does not easily disengage at the time of laying the drain material unit A, it is possible to use metal fittings of other engagement structures. Further, the material can be made of metal or synthetic resin.

  As shown in FIG. 4, a cap 21 with a water absorption path integrally having a water absorption pipe connection port 20 is fixed to one end of each drain material 10 constituting the drain material unit A so that the water absorption hose 22 can be connected. It has become. The other end of the drain member 10 is fitted with a closing cap 23 that closes the end.

The drain material unit A configured in this way is assembled in advance at the factory, and as shown in FIG. 5, the reels 25 each wound with the required number of drain materials 10 are coaxially spaced apart from each other at intervals necessary for work. The drain members 10 are pulled out from the reels 25 onto the work floor, and the drain members 10 and 10 are connected by the inter-drain material connector 11 and, if necessary, the inter-unit connector 17 is fixed. Thereafter, the gap between adjacent drain members 10 is narrowed and wound around one reel 26 to form a roll. At this time, without using the reel 26, a roll shape may be formed by winding around one central axis.
Next, a method for laying the drain material unit A in the horizontal direction at the laying site will be described.

  Each drain material unit A is carried in a roll shape into a disposal site into which soft soil such as dredged soil is charged, and is placed on a feeding stand 30 as shown in FIG. At this time, the roll center direction is set at the edge of the installation place with the direction perpendicular to the drain material installation direction.

  In this state, each drain material 10 constituting the drain material unit A is pulled out on the soft soil at the laying position, and the drain material unit A is manually or appropriately powered in the width direction, that is, the direction perpendicular to the pulling direction. , The drain material unit A is expanded in the width direction until the string-like material 13 constituting the drain material connecting member extends straight.

  In this way, it is pulled out and laid on the soft soil surface while expanding to the maximum width. For this drawing, a drawing jig 31 extending in the width direction of the drain material unit A is used. As shown in FIG. 1, the drawing jig 31 fixes a support shaft 33 to the front edge side of a rectangular reinforcing iron plate 32 oriented in the horizontal direction, and wheels 34 having a large buoyancy at predetermined intervals. The end of each drain member 10 is fixed to the support shaft 33 or the reinforcing iron plate 34, the pull-out operation rope 35 is fixed to the pull-out jig 31, and this is wound up by the winch 36. Pull out by.

  In this way, the required number of drain material units A are laid side by side, and the drain material units A are connected by the inter-unit connector 17 described above. Thus, after laying the drain material 10 at regular intervals on the soft soil surface of the required area, the outermost periphery is fixed to the revetment 40 using a fixing tool 37 such as a rope, and various places on the drain material unit A A padding weight such as a sandbag for preventing the floating is placed on the surface, and the entire laying of the drain material 10 is completed.

A Drain material unit 10 Drain material 11 Drain material connection tool 12 Fitting tool 13 String material 14 Half body 15 Flange 17 Unit connection tool 18 String material 18a Ring-shaped part 19 Tightening tool 19a Main body part 19b Bolt 20 Water absorption pipe Connecting port 21 Cap 22 Water absorption hose 23 Closing cap 25 Reel 26 Reel 30 Feeding base 31 Drawer 32 Reinforcement iron plate 33 Support shaft 34 Wheel 35 Draw operation rope 36 Winch 40 Revetment

Claims (5)

After throwing soft soil such as clayey clay into the disposal site to a predetermined depth, lay a number of drainage materials for ground improvement on the soft soil that has been put in the horizontal direction with a predetermined spacing. In addition, in the horizontal drain material laying method for soft ground improvement, by laying the drain material in the soft soil thrown into the disposal site by throwing the soft soil further on it,
The drain material laid in the horizontal direction has a predetermined number as a unit, and between the adjacent drain materials, a predetermined length is provided via a drain material connecting member having a length corresponding to a desired laying interval. Use connected drain material units for each
The drain material unit is wound in a roll shape with the interval between the drain materials connected to each other being narrower than the laying interval,
The drain material unit is carried into the laying site in a state wound in a roll shape, and the drain material unit wound in the roll shape is unwound and the tip is pulled out, and the drain material unit is drained to the length of the connector. A horizontal drain material laying method for improving soft ground, characterized in that the material interval is widened and pulled out onto the soft soil surface.   The horizontal drain material laying method for soft ground improvement according to claim 1, wherein the drain material units are laid next to each other, and the connection members between the drain material units of each drain material unit are connected via the inter-unit connection tool.   The drain-material connecting tool for connecting the drain members is composed of a ring-shaped fitting member that is fitted to the outer periphery of each drain member, and a string-like member that connects the fitting members. Or the horizontal drain material laying method for soft ground improvement of 2 or 2.   The inter-unit connector is composed of a string-like material fixed to each drain-material inter-connector at an edge of the drain material unit, and a tightening tool connected to the tip of the string-like material, and the drain material units adjacent to each other. The horizontal drain material laying method for soft ground improvement according to claim 2, wherein the drain material units are connected by engaging the binding tool with each other.   When unwinding the drain material unit wound in the roll shape and pulling out its tip, the drain material unit provided with wheels at regular intervals at the tip of each drain material constituting the drain material unit The horizontal drain material laying method for soft ground improvement according to any one of claims 1 to 4, wherein the method is fixed to a drawer jig extending in a width direction, and the drawer jig is pulled out by a winch through a rope.

Images