JP2017193864A - Ground improvement material temporary placement device and ground improvement material temporary placement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently implement a work to temporarily place a soil improvement material on the ground.SOLUTION: A soil improvement material temporary placing device 1 is a device for temporarily placing a soil improvement material in powder and granular material state on the ground. The soil improvement material temporary placing device 1 has a cylindrical member 2 with an underside opening, which has a soil improvement material inflow port 26 on an upper side and extends in a vertical direction, and a box-shaped member 3 with an underside opening, which is installed on the cylindrical member 2 so as to cover at least a lower part of the cylindrical member 2 from outside. An undersurface 2b of the cylindrical member 2 is located above the undersurface of the box-shaped member 3. The underside opening of the box-shaped member 3 can be blocked with the ground. A horizontal sectional area of an inner space of the box-shaped member 3 is larger than that of an inner space of the cylindrical member 2.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a device for temporarily placing a ground improvement material in the form of a granular material on the ground, and a method for temporarily placing a ground improvement material on the ground using this device.

  Patent Document 1 discloses a solidifying material spraying device for soft ground improvement. The vertically long cylindrical container body constituting this apparatus has an upper surface closed and a lower surface opened. A partition plate is provided in the cylindrical container body, and the upper compartment and the lower compartment of the tubular container body are partitioned by this partition plate. The upper compartment is provided with a dust collector and an exhaust port. The lower compartment is provided with a solidification material pumping port and a solidification material top end level sensor. A bucket hanging piece for hanging on a bucket of an excavator car is provided on the peripheral edge of the upper surface of the cylindrical container body.

Japanese Patent Laid-Open No. 08-144266

  However, using the solidified material improving device for soft ground improvement disclosed in Patent Document 1, the movement of the cylindrical container body and the temporary placement of the powdery ground improvement material on the ground are repeated, and a predetermined area of When a predetermined amount of ground improvement material is temporarily placed on the ground, the capacity of the cylindrical container body (especially the capacity of the lower compartment) is small, so the movement of the cylindrical container body and the ground improvement material to the ground The frequency of repeating temporary placement may increase, and as a result, it is difficult to efficiently perform temporary placement work on the ground of the ground improvement material.

  In view of such a situation, an object of the present invention is to efficiently perform temporary placement work of a ground improvement material on the ground.

  Therefore, the ground improvement material temporary placement device according to the present invention is a device for temporarily placing a powdery ground improvement material on the ground. This device has a ground improvement material inlet at the upper part and extends in the vertical direction, and is attached to the cylindrical member so as to cover at least the lower part of the cylindrical member from the outside, and the cylindrical member with the lower surface opening. And a box-shaped member having a lower surface opening. The lower surface of the cylindrical member is located above the lower surface of the box-shaped member. The lower surface opening of the box-shaped member can be closed by the ground. The horizontal cross-sectional area of the internal space of the box-shaped member is larger than the horizontal cross-sectional area of the internal space of the cylindrical member.

  The temporary placement method of the ground improvement material according to the present invention is a method of temporarily placing the ground improvement material on the ground using the above-described ground improvement material temporary placement device. In this method, a ground improvement material temporary placement device is placed at a first location on the ground, and the ground improvement material is pumped together with air from the outside of the box-shaped member to the ground improvement material inlet, and then the box at the first location. Storing the ground improvement material in the shaped member, and moving the ground improvement material temporary placement device from the first location to the second location on the ground with the ground improvement material remaining in the first location. ,including.

  According to this invention, the horizontal cross-sectional area of the internal space of the box-shaped member which comprises a ground improvement material temporary storage apparatus is larger than the horizontal cross-sectional area of the internal space of a cylindrical member. Therefore, when a predetermined amount of ground improvement material is temporarily placed on the ground of a predetermined area by repeatedly moving the ground improvement material temporary placement device and temporarily placing the ground improvement material on the ground, a tubular member The ground improvement material can be stored in a box-shaped member having an internal space with a horizontal cross-sectional area larger than the horizontal cross-sectional area of the internal space and temporarily placed on the ground. Therefore, the frequency of repeating the movement of the ground improvement material temporary placement device and the temporary placement of the ground improvement material on the ground can be reduced, and by extension, the temporary placement work of the ground improvement material on the ground can be efficiently performed. it can.

The top view of the ground improvement material temporary placement apparatus in a 1st embodiment of the present invention. The front view of the ground improvement material temporary storage apparatus in the said 1st Embodiment. II sectional view of FIG. Partial enlarged view of part P in FIG. Partial enlarged view of part Q in FIG. Top view of the cylindrical member in the first embodiment Front view of the cylindrical member in the first embodiment II-II sectional view of FIG. III-III sectional view of FIG. The figure which shows the mode of the ground improvement material temporary placement work in the said 1st Embodiment. The figure which shows the temporary placement method on the ground of the ground improvement material in the said 1st Embodiment. The figure which shows the temporary placement method on the ground of the ground improvement material in the said 1st Embodiment. The figure which shows the temporary placement method on the ground of the ground improvement material in the said 1st Embodiment. The figure which looked at the ground improvement material temporarily put on the ground in the 1st embodiment from the upper part The top view of the ground improvement material temporary storage apparatus in the 2nd Embodiment of this invention before the filter member is attached. The figure which shows the structure of the filter member in 3rd Embodiment of this invention. Schematic which shows the connection of the ground improvement material inflow port and hose of the cylindrical member in 4th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.
FIG.1 and FIG.2 is the top view and front view of the ground improvement material temporary storage apparatus 1 in 1st Embodiment of this invention. 3 is a cross-sectional view taken along the line II of FIG. 4 and 5 are partially enlarged views of the part P and the part Q in FIG. 6 and 7 are a top view and a front view of the tubular member 2. 8 is a cross-sectional view taken along the line II-II in FIG. 9 is a cross-sectional view taken along the line III-III in FIG.

  The ground improvement material temporary placement device 1 is a device for temporarily placing a powdery ground improvement material (hereinafter simply referred to as “ground improvement material”) on the ground. Here, in this embodiment, although demonstrated below that a ground improvement material is cement, a ground improvement material is not restricted to cement. For example, the ground improvement material may be quick lime or slaked lime. The ground improvement material is a solidified material used for stabilizing the ground.

As shown in FIG. 1 to FIG. 3, the ground improvement material temporary placement device 1 includes a tubular member 2 and a bottom opening attached to the tubular member 2 so as to cover at least the lower part of the tubular member 2 from the outside. A box-shaped member 3.
As shown in FIGS. 1 to 3 and FIGS. 6 to 9, the tubular member 2 is made of steel and extends in the up-down direction. The opening of the upper surface 2 a of the cylindrical member 2 is closed by a plate-like lid member 21. That is, the upper surface of the cylindrical member 2 is closed. The lid member 21 is made of steel, and is fixed to the upper peripheral edge portion of the tubular member 2 by welding. The lower surface 2b of the cylindrical member 2 is open. In addition, in this embodiment, although the cross-sectional shape of the cylindrical member 2 is circular, the cross-sectional shape of the cylindrical member 2 is not restricted to this, For example, an elliptical shape or a rectangle may be sufficient.

  A plurality of suspension portions 22 for lifting the tubular member 2 and the box-shaped member 3 are provided on the upper part of the outer peripheral surface of the tubular member 2. In the present embodiment, the four hanging portions 22 are provided radially above the outer peripheral surface of the tubular member 2 in a top view. The hanging portion 22 is formed of, for example, a steel plate having a through hole, and is welded and fixed to the upper portion of the outer peripheral surface of the tubular member 2. In addition, in this embodiment, although the suspension part 22 for lifting up the cylindrical member 2 and the box-shaped member 3 is provided only in the cylindrical member 2, about this suspension part 22, the cylindrical member 2 and box shape It may be provided on at least one of the members 3. In the present embodiment, the number of the hanging portions 22 is four, but the number of the hanging portions 22 is not limited thereto.

  The tubular member 2 has a plurality of leg portions 23 that extend downward from the lower surface 2b and support the tubular member 2. In the present embodiment, the number of leg portions 23 is four, but the number of leg portions 23 is not limited thereto. The upper end portion of the leg portion 23 is fixed to the lower end portion of the outer peripheral surface of the tubular member 2. A rectangular plate-like member 24 is provided at the lower end of the leg portion 23, and the rectangular lower surface of the plate-like member 24 contacts the ground. Therefore, the lower surface 2b of the cylindrical member 2 is located above the ground. That is, the lower surface 2b of the cylindrical member 2 is separated from the ground by a substantial length of the leg portion 23 (a distance L shown in FIG. 7).

  As shown in FIGS. 3 and 8, a tubular member 25 made of steel that communicates the inside and outside of the tubular member 2 through the peripheral wall (side wall) is provided at the upper portion of the tubular member 2. The tubular member 25 constitutes the ground improvement material inlet 26 of the tubular member 2. That is, the cylindrical member 2 has the ground improvement material inlet 26 in the upper part.

  An outer flange portion 25c for connecting a hose 68, which will be described later, is provided on the open end portion (that is, the upstream end portion) 25a on the side located outside the tubular member 2 in the tubular member 25. An opening end portion (that is, a downstream end portion) 25b on the side of the tubular member 25 located in the tubular member 2 opens downward. Here, the downstream end 25b of the tubular member 25 corresponds to the “first end” of the present invention.

  The tubular member 25 extends horizontally from the upstream end 25a side, penetrates the upper side wall of the tubular member 2 from the outside to the inside, bends downward in the tubular member 2, and the downstream end 25b Open downward. The tubular member 25 is welded and fixed to the tubular member 2 in the middle thereof (specifically, a portion penetrating the side wall of the tubular member 2).

  As shown in FIGS. 3, 8, and 9, an umbrella-shaped member 28 is disposed in the cylindrical member 2 so as to form an annular gap 27 between the inner peripheral surface of the cylindrical member 2. Yes. The umbrella-like member 28 is located below the downstream end 25 b of the tubular member 25 and is located above the lower surface 2 b of the tubular member 2.

  The umbrella-shaped member 28 has an umbrella shape that tapers upward. The umbrella-shaped member 28 is formed in a pyramid shape or a conical shape that tapers upward. In the present embodiment, as an example of the umbrella-shaped member 28, an umbrella-shaped member tapered toward the upper side is illustrated in FIGS. 3, 8, and 9. FIG.

  The tip part (upper end part) of the umbrella-shaped member 28 is opposed to the opening of the downstream end part 25 b of the tubular member 25. The umbrella-shaped member 28 is fixed to the inner peripheral surface of the tubular member 2 via two rod-shaped members 29.

  As shown in FIGS. 1 to 3, the box-shaped member 3 includes a rectangular parallelepiped frame portion 31, a plate-like member 32 provided on each side of the frame portion 31, and a plate provided on the upper surface of the frame portion 31. Shaped member 34.

  The frame portion 31 includes a plurality of column members 37 and a plurality of beam members 38. A rectangular parallelepiped frame portion 31 is formed by assembling the column member 37 and the beam member 38. Here, the column member 37 and the beam member 38 are, for example, square steel pipes.

  The cylindrical member 2 is located at the center portion of the frame portion 31 in a top view. The lower part and the leg part 23 of the cylindrical member 2 are located in the frame part 31, and the upper part of the cylindrical member 2 including the ground improvement material inlet 26 protrudes upward from the frame part 31. The cylindrical member 2 is fixed to the frame portion 31 on the outer peripheral surface side.

  The plate-like member 32 has a rectangular shape, and is attached to the frame portion 31 so as to close an opening portion from the central portion in the vertical direction to the lower end portion on each side surface of the frame portion 31.

  The plate member 32 is provided with a window 33. The window part 33 is comprised by the opening part 33a formed in the plate-shaped member 32, and the transparent or semi-transparent plate-shaped member 33b provided so that the opening part 33a may be plugged up. The plate member 33b is made of, for example, an acrylic resin. The opening 33a has a rectangular shape that is elongated in the vertical direction. Therefore, the box-shaped member 3 has a window portion 33 that is provided on the plate-shaped member 32 that constitutes the side surface thereof so that the inside of the box-shaped member 3 can be visually recognized. When the operator looks into the window 33 from the outside of the box-shaped member 3, the worker grasps the state inside the box-shaped member 3 (particularly, the height of the ground improvement material accumulated in the box-shaped member 3). be able to. The window 33 can be provided on one or more of the four side surfaces of the box-shaped member 3.

  The plate-like member 34 is attached to the frame portion 31 so as to close a portion close to the upstream end portion 25a (outer flange portion 25c) of the tubular member 25 in the opening portion on the upper surface of the frame portion 31. The box-shaped member 3 is provided with a staircase portion 35 that is used when the worker ascends on the plate-shaped member 34 and when the worker descends from the plate-shaped member 34. Note that the stepped portion 35 may be detachably attached to the box-shaped member 3.

  At the lower end portion of the box-shaped member 3 (specifically, the lower end portion of the frame portion 31), a convex portion 39 protruding downward from the lower end portion of the box-shaped member 3 is provided. As shown in FIG. 5, the convex part 39 is formed of angle steel. The convex portion 39 can bite into the ground (see FIGS. 11 and 12 described later). The convex part 39 is formed in an annular shape so as to surround the lower surface opening of the box-shaped member 3.

  As shown in FIGS. 1 to 3, the box-shaped member 3 has a ventilation portion 45 that communicates the inside and the outside of the box-shaped member 3 at the top thereof. The ventilation portion 45 includes an upper opening portion on each side surface of the frame portion 31 and a portion of the opening portion on the upper surface of the frame portion 31 that is not blocked by the plate-like member 34. The ventilation member 45 is provided with a replaceable filter member 40 having air permeability so as to cover it. That is, the filter member 40 is detachably attached to the ventilation portion 45. Here, the filter member 40 suppresses the dust in the box-shaped member 3 being discharged out of the box-shaped member 3.

Here, the configuration of the filter member 40 and the attachment of the filter member 40 to the box-shaped member 3 (ventilation portion 45) will be described with reference to FIG.
The filter member 40 is formed by laminating a first breathable sheet material 41, a second breathable sheet material 42, and a third breathable sheet material 43 in this order from the inside to the outside of the box-shaped member 3. It has a three-layer structure.

The first air permeable sheet material 41 is a sheet-like member generally used as an oil adsorbing material, has air permeability, and is made of resin (for example, made of polypropylene).
The 2nd air permeable sheet material 42 is a sheet-like member formed with the coconut shell fiber, and has air permeability.
The 3rd air permeable sheet material 43 is a resin-made net-like member, and has air permeability.

  Here, the third breathable sheet material 43 is coarser than the second breathable sheet material 42. The second breathable sheet material 42 is coarser than the first breathable sheet material 41. Therefore, in this embodiment, the filter member 40 has a laminated structure formed by laminating a plurality of breathable sheet materials 41 to 43 so that the mesh becomes coarser from the inside to the outside of the box-like member 3. ing.

  That is, the opening area per unit area of the third breathable sheet material 43 is larger than the opening area per unit area of the second breathable sheet material 42. Further, the opening area per unit area of the second breathable sheet material 42 is larger than the opening area per unit area of the first breathable sheet material 41. Therefore, in this embodiment, the filter member 40 is formed by laminating a plurality of breathable sheet materials 41 to 43 so that the opening area per unit area increases from the inner side to the outer side of the box-shaped member 3. It has a laminated structure.

  Therefore, the breathability of the third breathable sheet material 43 is higher than the breathability of the second breathable sheet material 42. Further, the air permeability of the second air-permeable sheet material 42 is higher than the air permeability of the first air-permeable sheet material 41. Therefore, in this embodiment, the filter member 40 has a laminated structure formed by laminating a plurality of air permeable sheet materials 41 to 43 so that the air permeability becomes higher from the inside to the outside of the box-like member 3. doing.

  A plate-like member 52 having an opening 51 and a plurality of angle steels 53 for fixing the filter member 40 to the frame part 31 are fixed to the outer surface of the part of the frame part 31 to which the filter member 40 is attached. Yes. The plurality of angle steels 53 are fixed to the outer surface of the frame portion 31 with a space therebetween so as to surround the periphery of the filter member 40 attached to the frame portion 31 (see FIGS. 1 and 2).

  As shown in FIGS. 1 to 4, the filter member 40 having a three-layer structure includes a plurality of chevron shapes sandwiched between a plate-like member 52 having an opening 51 and a pressing plate 55 having an opening 54. Surrounded by steel 53. In this state, the wedge member 56 is interposed between the angle steel 53 and the pressing plate 55, and the filter member 40 is pressed to the plate-like member 52 side, whereby the filter member 40 is attached to the box-like member 3. It is done.

  Accordingly, the air in the box-shaped member 3 passes through the opening portion 51 of the plate-shaped member 52, the first air-permeable sheet material 41, and the second air-permeable sheet material 42 at the ventilation portion 45 at the top of the box-shaped member 3. The third air-permeable sheet material 43 and the opening 54 of the pressing plate 55 can be discharged in this order and discharged to the outside.

  On the other hand, the dust in the box-shaped member 3 reaches the filter member 40 through the opening 51 of the plate-shaped member 52 in the ventilation portion 45 at the top of the box-shaped member 3. The filter member 40 suppresses the passage of dust. Accordingly, it is possible to suppress the dust from being discharged out of the box-shaped member 3 through the opening 54 of the pressing plate 55.

  As shown in FIGS. 11 and 12 to be described later, when the tubular member 2 and the box-like member 3 attached to the tubular member 2 are placed on the ground, the projections provided on the box-like member 3 are provided. The part 39 bites into the ground by the weight of the box-shaped member 3 (see FIGS. 11 and 12 described later). In this state, the lower surface opening of the box-shaped member 3 can be blocked by the ground. Here, the lower surface 2 b of the cylindrical member 2 is located above the lower surface of the box-shaped member 3.

  As shown in FIGS. 1 to 3, the box-shaped member 3 has a horizontal cross-sectional area of the internal space larger than the horizontal cross-sectional area of the internal space of the tubular member 2. In the present embodiment, the box-shaped member 3 has a horizontal cross-sectional area of the internal space in the range of 9 to 12 times the horizontal cross-sectional area of the internal space of the tubular member 2.

  FIG. 10 is a diagram showing a state of the ground improvement material temporary placement work in the present embodiment. In the present embodiment, the following description will be made assuming that the ground on which the ground improvement material is temporarily placed is the upper surface 61 of the improvement target soil (in other words, soft soil or base material) 60. Here, as the upper surface 61 of the improvement object soil 60, the surface of the present ground and the upper surface of embankment can be mentioned, for example.

  As shown in FIG. 10, on the upper surface 61 of the soil to be improved 60, a backhoe 64 that can function as a lifting device, and the cylindrical member 2 and the box-shaped member 3 that constitute the ground improvement material temporary storage device 1 described above. And are arranged. On the ground adjacent to the improvement target soil 60, a granular material transport vehicle 65 is arranged. That is, the granular material transport vehicle 65 is disposed outside the box-shaped member 3.

  A hook 64b for hooking the wire 64a is attached to the tip of the arm of the backhoe 64. The wire 64a is detachably attached to the hanging portion 22 of the tubular member 2 via a hanging metal fitting (not shown). In the present embodiment, with the wire 64a attached to the suspension part 22 and hooked on the hook 64b, the arm of the backhoe 64 is lifted and lowered to lift the tubular member 2 and the box-shaped member 3. Can be suspended. Further, the tubular member 2 and the box-shaped member 3 move on the upper surface 61 when the backhoe 64 travels on the upper surface 61 in a state where the cylindrical member 2 and the box-shaped member 3 are lifted via the wire 64a. can do.

  The granular material transport vehicle 65 includes a tank 66 and a pumping means (not shown). Here, the tank 66 corresponds to the “accommodating portion” of the present invention and accommodates the ground improvement material. The aforementioned pressure feeding means realizes a function of feeding the ground improvement material accommodated in the tank 66 together with air to the ground improvement material inlet 26 (tubular member 25) via the hose 68. The aforementioned pumping means includes an air compressor. Examples of the granular material transport vehicle 65 including the tank 66 and the above-described pressure feeding means are disclosed in Japanese Patent Application Laid-Open Nos. 2007-22658 and 2009-35299.

Next, a method for temporarily placing the ground improvement material on the upper surface 61 of the improvement target soil 60 will be described with reference to FIGS. 11 to 14 in addition to the above-described FIGS.
FIGS. 11-13 shows the temporary placement method on the upper surface 61 of a ground improvement material. FIG. 14 is a view of the ground improvement material temporarily placed on the upper surface 61 as viewed from above.

  First, as shown in FIG. 10, the cylindrical member 2 and the box-shaped member 3, the backhoe 64, and the granular material transport vehicle 65 which comprise the ground improvement material temporary placement apparatus 1 are arrange | positioned. At this time, the cylindrical member 2 and the box-shaped member 3 constituting the ground improvement material temporary placement device 1 are placed on the temporary placement planned place (first place) of the ground improvement material on the upper surface 61 of the soil 60 to be improved. Is done. In addition, preparation is made so that the ground improvement material accommodated in the tank 66 of the granular material transport vehicle 65 can be pumped together with air to the ground improvement material inlet 26 (tubular member 25) via the hose 68.

  Next, as shown in FIG. 11, the pressure feeding means of the granular material transport vehicle 65 is operated, and the ground improvement material in the tank 66 (that is, outside the box-shaped member 3) is ground with the air via the hose 68. It pumps to the inflow port 26 (tubular member 25). Immediately after the start of the pumping, the ground improvement material is released downward from the opening of the downstream end 25b of the tubular member 25 in the tubular member 2 and soars in the box-shaped member 3, but this soared ground The improvement material is prevented from being discharged from the box-shaped member 3 to the outside of the box-shaped member 3 by the biting of the annular convex portion 39 into the ground and the filter member 40.

At the time of the above-mentioned ground improvement material pumping, the operator can grasp the degree of accumulation of the ground improvement material in the box-shaped member 3 by looking into the window 33 from the outside of the box-shaped member 3.
As shown in FIG. 12, when the ground improvement material accumulates to some extent in the box-shaped member 3, the bulk improvement material is raised so that the ground improvement material rises from below, and the box-shaped member of the ground improvement material Soaring in 3 is suppressed.

When a desired amount of the ground improvement material is accumulated in the box-like member 3, the above-mentioned ground improvement material is stopped from being pumped. Thereafter, as shown in FIG. 13, the tubular member 2 and the box-shaped member 3 are lifted in a state where the ground improvement material is placed at the above-described temporary placement planned place (first place), and the backhoe 64 is placed on the upper surface 61. By moving above, the cylindrical member 2 and the box-shaped member 3 are moved from the above-mentioned temporary placement planned place (first place) to the next temporary placement place (second place) of the ground improvement material. Let
The temporary placement of the ground improvement material on the upper surface 61 and the movement of the tubular member 2 and the box-shaped member 3 on the upper surface 61 are repeated to temporarily place a predetermined amount of the ground improvement material on the upper surface 61 having a predetermined area. Put.

  FIG. 14 (A) shows a temporary placement on the upper surface 61 by repeatedly placing the ground improvement material on the upper surface 61 and moving the tubular member 2 and the box-shaped member 3 on the upper surface 61. The piles 71-74 of the ground improvement material which showed are shown. The piles 71 to 74 of the ground improvement material are temporarily placed on the upper surface 61 in this order. The piles 71 to 74 of the ground improvement material are temporarily placed on the upper surface 61 at intervals.

  In FIG. 14B, the above-mentioned ground improvement material is temporarily placed on the upper surface 61 and the movement of the tubular member 2 and the box-shaped member 3 on the upper surface 61 is repeated to be temporarily placed on the upper surface 61. The piles 81-85 of the ground improvement material which showed are shown. The piles 81 to 85 of the ground improvement material are temporarily placed on the upper surface 61 in this order. The ground improvement material mountains 81 to 85 are temporarily placed on the upper surface 61 so that adjacent mountains partially overlap each other.

  When the temporary placement work of the ground improvement material on the upper surface 61 of the improvement target soil 60 is completed, the ground improvement material temporarily placed on the upper surface 61 is spread using the backhoe 64, and the ground improvement material and the improvement target soil are then leveled. 60 and mix. In this way, ground improvement is performed.

  According to the present embodiment, the ground improvement material temporary placement device 1 is a device for temporarily placing a powdery ground improvement material on the ground. The ground improvement material temporary placement device 1 has a ground improvement material inlet 26 at the upper part and extends in the vertical direction, and has a cylindrical member 2 with an open lower surface 2b and at least a lower part of the cylindrical member 2 outside. A box-shaped member 3 having an opening on the lower surface attached to the cylindrical member 2 so as to cover from the side. The lower surface opening of the box-shaped member 3 can be closed by the ground. The horizontal cross-sectional area of the internal space of the box-shaped member 3 is larger than the horizontal cross-sectional area of the internal space of the cylindrical member 2. Therefore, in the case where a predetermined amount of ground improvement material is temporarily placed on the ground having a predetermined area by repeating the movement of the ground improvement material temporary placement device 1 and the temporary placement of the ground improvement material on the ground, a tubular shape is required. The ground improvement material can be stored in the box-shaped member 3 having an internal space with a larger horizontal cross-sectional area than the horizontal cross-sectional area of the internal space of the member 2 and temporarily placed on the ground. Therefore, the frequency of repeating the movement of the ground improvement material temporary placement device 1 and the temporary placement of the ground improvement material on the ground can be reduced, and by extension, the temporary placement work of the ground improvement material on the ground can be efficiently performed. Can do.

  Further, according to the present embodiment, the lower surface 2 b of the cylindrical member 2 is positioned above the lower surface of the box-shaped member 3. Thereby, the ground improvement material can be smoothly flowed into the box-shaped member 3 from the opening of the lower surface 2 b of the cylindrical member 2.

  Further, according to the present embodiment, the cylindrical member 2 has a plurality of leg portions 23 that extend downward from the lower surface 2 b of the cylindrical member 2 and support the cylindrical member 2. Thereby, the attitude | position of the cylindrical member 2 can be stabilized on the ground.

  Moreover, according to this embodiment, the upper surface of the cylindrical member 2 is obstruct | occluded. The ground improvement material inlet 26 includes a tubular member 25 that penetrates the peripheral wall of the tubular member 2 and communicates the inside and outside of the tubular member 2. A first end (downstream end 25 b) that is an end of the tubular member 25 on the side located in the tubular member 2 is opened downward. Thereby, the ground improvement material discharged | emitted from opening of the downstream edge part 25b of the tubular member 25 can be smoothly guided to the lower part in the box-shaped member 3. FIG.

  Moreover, according to this embodiment, the ground improvement material temporary placement apparatus 1 is an umbrella-shaped member arranged in the tubular member 2 so as to form an annular gap 27 between the inner peripheral surface of the tubular member 2. 28 is further provided. The umbrella-shaped member 28 is positioned below the first end portion (downstream end portion 25 b) of the tubular member 25 and positioned above the lower surface 2 b of the tubular member 2. As a result, the ground improvement material released from the opening of the downstream end portion 25b of the tubular member 25 can fall through the annular gap 27 after colliding with the umbrella-shaped member 28, so that the downstream side of the tubular member 25 It can suppress that a ground improvement material falls intensively just under the edge part 25b, and accumulates locally. That is, the ground improvement material can be evenly dispersed in the box-shaped member 3 by the umbrella-shaped member 28.

  Further, according to the present embodiment, the umbrella-like member 28 is formed in a conical shape or a pyramid shape that tapers upward. The tip of the umbrella-shaped member 28 is opposed to the opening of the first end (downstream end 25 b) of the tubular member 25. Thereby, the ground improvement material discharge | released from the opening of the downstream end part 25b of the tubular member 25 can be diffused from the axial center side of the cylindrical member 2 to the inner peripheral surface side with a simple configuration.

  In addition, according to the present embodiment, the box-shaped member 3 includes the ventilation member 45 (the plate-shaped member 32 among the opening portions on the side surfaces of the frame portion 31) communicating with the upper and lower sides of the box-shaped member 3. And a portion not covered by the plate-like member 34 in the opening portion on the upper surface of the frame portion 31). Thereby, the ventilation part 45 can be functioned as an exhaust port for exhausting the air in the box-shaped member 3.

  Further, according to the present embodiment, the ventilation portion 45 (the portion of the opening portion on each side surface of the frame portion 31 that is not blocked by the plate-like member 32 and the upper surface of the frame portion 31 according to the present embodiment) A filter member 40 that is replaceable and has air permeability is provided in a portion of the opening portion that is not blocked by the plate-like member 34. Thereby, it can suppress that the dust in the box-shaped member 3 is discharged | emitted out of the box-shaped member 3 through the ventilation part 45 of the upper part of the box-shaped member 3. FIG.

  Further, according to the present embodiment, at least one of the tubular member 2 and the box-shaped member 3 is provided with the suspension portion 22 for lifting the tubular member 2 and the box-shaped member 3. Thereby, the cylindrical member 2 and the box-shaped member 3 can be easily moved on the ground in a state where the cylindrical member 2 and the box-shaped member 3 are lifted using a lifting device such as the backhoe 64.

  Moreover, according to this embodiment, the box-shaped member 3 has the convex part 39 which protrudes below from the lower end part of the box-shaped member 3, and can bite into the ground. Thereby, it can suppress that the dust in the box-shaped member 3 leaks out of the box-shaped member 3 through the clearance gap between the lower end part of the box-shaped member 3, and the ground.

  Moreover, according to this embodiment, the box-shaped member 3 has the window part 33 which is provided in the side surface (plate-shaped member 32) of a box-shaped member, and makes the inside of the box-shaped member 3 visible. Thereby, the operator can grasp | ascertain easily the accumulation condition of the ground improvement material in the box-shaped member 3 by looking into the window part 33. FIG.

  In addition, according to the present embodiment, the ground improvement material inlet 26 for receiving the ground improvement material accommodated in the storage portion (tank 66) and the ground improvement material accommodated in the storage portion (tank 66) through the hose 68 together with the air. The pumping means for pumping to the outside is disposed outside the box-shaped member 3 (see FIG. 10). Thereby, the ground improvement material can be continuously supplied into the box-shaped member 3 by using the storage portion (tank 66) as the supply source of the ground improvement material.

  Moreover, according to this embodiment, the vehicle (powder particle transport vehicle 65) is provided with the accommodating part (tank 66) and the said pressure feeding means. Thereby, using the cylindrical member 2 and the box-shaped member 3 and the granular material transport vehicle 65, the ground improvement material can be efficiently distributed on the ground in the ground improvement target region over a wide range.

  Further, according to the present embodiment, as a method of temporarily placing the ground improvement material on the ground (on the upper surface 61 of the improvement target soil 60) using the ground improvement material temporary placement device 1, the ground improvement material (upper surface of the improvement target soil 60) is used. 61), the ground improvement material temporary placing device 1 is placed at the first place (scheduled place of the ground improvement material), and the ground improvement material inlet 26 together with the air is supplied from the outside of the box-shaped member 3. The ground improvement material is stored in the box-like member 3 in the first place (the place where the ground improvement material is temporarily placed) by being pumped to the ground, and the ground is placed in the first place (the place where the ground improvement material is temporarily placed). With the improvement material in place, the ground improvement material temporary storage device 1 is moved from the first location (the planned storage location of the ground improvement material) to the second location (on the upper surface 61 of the soil 60 to be improved) (next) To the temporary placement place of the ground improvement material. Thereby, the movement of the ground improvement material temporary placement device 1 and the temporary placement of the ground improvement material on the ground (on the upper surface 61 of the improvement target soil 60) are repeated, and the ground surface (the upper surface of the improvement target soil 60) is determined. 61), a predetermined amount of ground improvement material can be efficiently temporarily placed.

  In addition, in this embodiment, since it is not necessary to use a some flexible container bag for conveyance of a ground improvement material like the conventional construction method, it is not necessary to repeat a slinging operation for every flexible container bag. Therefore, work efficiency can be improved. In addition, since the flexible container bag does not need to be broken, the work safety of the worker can be improved. Furthermore, since it is not necessary to discard the flexible container bag after use, generation | occurrence | production of the waste accompanying conveyance of a ground improvement material can be suppressed.

  Moreover, according to this embodiment, by using relatively easy-to-handle cement as the ground improvement material, the ground improvement material can be efficiently distributed on the ground in a wide area of the ground improvement target area.

  FIG. 15 is a top view of the ground improvement material temporary placement device 1 before the filter member 40 is attached in the second embodiment of the present invention. That is, the ground improvement material temporary placement device 1 shown in FIG. 15 is used for temporarily placing the ground improvement material on the ground after the filter member 40 is attached.

Differences from the first embodiment will be described.
In this embodiment, arrangement | positioning of the angle iron 53 installed in the upper surface of the frame part 31 of the box-shaped member 3 differs from 1st Embodiment. Thus, the arrangement of the angle steel 53 can be any arrangement according to the shape of the filter member 40 attached to the box-shaped member 3.

FIG. 16 is a diagram showing a configuration of a filter member 40 ′ in the third embodiment of the present invention. Here, FIG. 16 corresponds to FIG. 4 described above.
Differences from the first embodiment will be described.

In the present embodiment, the beam member 38 ′ is formed of angle steel. In the present embodiment, the plate-like member 52 is omitted.
Further, in the present embodiment, the ventilation portion 45 is provided with a replaceable filter member 40 ′ having air permeability so as to cover it. That is, the filter member 40 ′ is detachably attached to the ventilation portion 45. Here, the filter member 40 ′ suppresses the dust in the box-shaped member 3 from being discharged out of the box-shaped member 3.

  The filter member 40 ′ includes a second breathable sheet material 42, a first breathable sheet material 41, a second breathable sheet material 42, and a third breathable sheet material 43 in this order. 3 has a four-layer structure laminated from the inside to the outside.

  The filter member 40 ′ is surrounded by a plurality of angle steels 53 while being sandwiched between a pressing plate 55 having an opening 54 and a beam member 38 ′. In this state, a wedge member 56 ′ is interposed between the angle steel 53 and the pressing plate 55, and the filter member 40 ′ is pressed toward the beam member 38 ′, so that the filter member 40 ′ is a box-shaped member. 3 is attached.

  By the way, in the first embodiment described above, the finest first breathable sheet material 41 among the first to third breathable sheet materials 41 to 43 constituting the filter member 40 is in the box-shaped member 3. I'm here. Therefore, about the 1st air permeable sheet material 41, a granular-form ground improvement material is clogged with a fine eye | texture, and it is easy to raise | generate clogging. Moreover, about the 1st air permeable sheet | seat material 41, since a ground improvement material will clog a fine eye at the time of clogging, it is difficult to eliminate clogging at all. Therefore, when clogging occurs in the first breathable sheet material 41, there is a concern that it must be discarded as it is.

  In this regard, according to the present embodiment, the second breathability that is coarser than the first breathable sheet material 41 among the first to third breathable sheet materials 41 to 43 constituting the filter member 40 ′. A sheet material 42 faces the box-shaped member 3. Since the second breathable sheet material 42 is coarser than the first breathable sheet material 41, the occurrence frequency of clogging due to the ground improvement material can be reduced. Further, the second breathable sheet material 42 can be reused because the clogging can be eliminated by crushing even if clogging occurs. . Therefore, according to the present embodiment, by using the filter member 40 ′, it is possible to reduce the replacement frequency of the filter member, and it is possible to extend the life of the filter member.

FIG. 17 is a schematic diagram showing the connection between the ground improvement material inlet 26 and the hose 68 of the tubular member 2 according to the fourth embodiment of the present invention. Here, FIG. 17 is the figure which looked at the cylindrical member 2 from the upper direction.
Differences from the first embodiment will be described.

  The outer flange portion 68a of the hose 68 is connected to the ground improvement material inlet 26 of the tubular member 2 (specifically, the outer flange portion 25c of the upstream end portion 25a of the tubular member 25). About this connection part, outer flange parts 25c and 68a are clamped with the lever 69, and are being mutually fixed.

  In the present embodiment, as a safety measure, the hose 68 is formed in a cylindrical shape via a plurality of turnbuckles 70 as fixing means so that the hose 68 does not become undisturbed even if the hose 68 is detached from the ground improvement material inlet 26. It is fixed to the member 2. The turnbuckle 70 is extendable and adjustable to an arbitrary length. One end of the turnbuckle 70 is attached to an attachment member 68 b provided on the outer peripheral surface of the hose 68, and the other end is attached to a bracket portion 22 a provided on the suspension portion 22 of the tubular member 2. Yes.

  The illustrated embodiments are merely examples of the present invention, and the present invention is not limited to those directly described by the described embodiments, and various improvements and modifications made by those skilled in the art within the scope of the claims. Needless to say, it encompasses changes.

DESCRIPTION OF SYMBOLS 1 Ground improvement material temporary placement apparatus 2 Cylindrical member 2a Upper surface 2b Lower surface 3 Box-shaped member 21 Lid member 22 Suspension part 22a Bracket part 23 Leg part 24 Plate-like member 25 Tubular member 25a Upstream end part 25b Downstream end part 25c Outside Flange portion 26 Ground improvement material inlet 27 Gap 28 Umbrella member 29 Bar member 31 Frame portion 32 Plate member 33 Window portion 33a Opening portion 33b Plate member 34 Plate member 35 Step member 37 Column members 38, 38 'Beam member 39 Projection 40, 40 'Filter member 41 First air-permeable sheet material 42 Second air-permeable sheet material 43 Third air-permeable sheet material 45 Ventilation portion 51 Opening portion 52 Plate-like member 53 Angle steel 54 Opening portion 55 Presser plates 56, 56 'Wedge member 60 Improvement target soil 61 Upper surface 64 Backhoe 64a Wire 64b Hook 65 Powder and granular material transport vehicle 66 Tank 68 Hose 68a Outer frame Ridge portion 68b mounting member 70 turnbuckle 71-74, 81-85 pile of ground improvement material

Claims (12)

An apparatus for temporarily placing a ground improvement material in the form of a granular material on the ground,
A cylindrical member having a bottom surface opening that has a ground improvement material inlet at the top and extends in the vertical direction;
A box-like member having an opening on the lower surface attached to the tubular member so as to cover at least the lower part of the tubular member from the outside;
With
The lower surface of the tubular member is located above the lower surface of the box-shaped member;
The lower surface opening of the box-shaped member can be closed by the ground,
The ground improvement material temporary storage apparatus whose horizontal cross-sectional area of the internal space of the said box-shaped member is larger than the horizontal cross-sectional area of the internal space of the said cylindrical member.   The ground improvement material temporary placement device according to claim 1, wherein the tubular member has a plurality of legs that extend downward from a lower surface of the tubular member and support the tubular member. The upper surface of the cylindrical member is closed;
The ground improvement material inflow port includes a tubular member that penetrates the peripheral wall of the tubular member and communicates the inside and outside of the tubular member,
The ground improvement material temporary placement apparatus according to claim 1 or 2, wherein a first end portion, which is an end portion on a side located in the tubular member, of the tubular member is opened downward. An umbrella-shaped member disposed in the cylindrical member so as to form an annular gap with the inner peripheral surface of the cylindrical member;
The ground improvement material temporary placement device according to claim 3, wherein the umbrella-like member is located below the first end portion of the tubular member and is located above the lower surface of the tubular member. The umbrella-shaped member is formed in a conical shape or a pyramid shape that tapers upward.
The ground improvement material temporary placement apparatus according to claim 4, wherein a tip end portion of the umbrella-shaped member is opposed to an opening of the first end portion of the tubular member.   The said box-shaped member is a ground improvement material temporary storage apparatus of any one of Claims 1-5 which has a ventilation part which connects the inside and outside of the said box-shaped member in the upper part of the said box-shaped member.   The ground improvement material temporary placement device according to claim 6, wherein a replaceable filter member is provided in the ventilation portion.   The suspension part for lifting the said cylindrical member and the said box-shaped member is provided in at least one of the said cylindrical member and the said box-shaped member in any one of Claims 1-7. The ground improvement material temporary placement apparatus of description.   The ground improvement material temporary placing device according to any one of claims 1 to 8, wherein the box-shaped member has a convex portion that protrudes downward from a lower end portion of the box-shaped member and can bite into the ground. .   The ground improvement material provisional material according to any one of claims 1 to 9, wherein the box-shaped member has a window portion that is provided on a side surface of the box-shaped member so that the inside of the box-shaped member can be visually recognized. Placement device.   A storage part in which the ground improvement material is stored, and a pumping means for pumping the ground improvement material stored in the storage part together with air to the ground improvement material inflow port via a hose are outside the box-shaped member. The ground improvement material temporary placement apparatus according to any one of claims 1 to 10, which is arranged. A method of temporarily placing the ground improvement material on the ground using the ground improvement material temporary placement device according to any one of claims 1 to 11,
Placing the ground improvement material temporary placement device at a first location on the ground;
Storing the ground improvement material in the box-shaped member in the first place by pumping the ground improvement material from outside the box-shaped member together with air to the ground improvement material inflow port; and
Moving the ground improvement material temporary placement device from the first location to the second location on the ground, with the ground improvement material remaining in the first location;
A temporary placement method for ground improvement materials, including