JP6274763B2 - Embankment reinforcement structure and slope reinforcement embankment method - Google Patents

Description

  The present invention relates to an embankment reinforcing structure and a slope reinforcing embankment method using an L-shaped formwork. More specifically, the present invention relates to an embankment reinforcement structure and a slope reinforcement embankment method in which an L-shaped form is not easily deformed by earth pressure of the embankment.

  In the method of construction of retaining walls with steep slopes that are perpendicular to or close to the ground of natural ground and the embankment method that constructs the reinforcement slopes in the construction site slope, etc., it is based on earth pressure from the mountain or the embankment side. In addition, slip collapse is likely to occur on the valley side, and therefore, a method of installing a substantially L-shaped form in cross section in front of the slope is known.

  In the reinforcement slope construction ground method using an L-shaped formwork, a substantially L-shaped formwork having a standing front surface portion and a horizontal bottom surface portion is placed in front of a mountain or a created ground slope, After carrying in, compaction (rolling) is performed to construct a one-stage embankment, and by repeating such an operation from the bottom to the top a predetermined number of times, a multi-stage reinforcing slope structure is formed.

  Many L-shaped formwork has been proposed. For example, Patent Document 1 proposes a substantially L-shaped form using expanded metal. Patent Document 2 proposes a substantially L-shaped formwork using a grid-like wire mesh. Reinforcement slope construction using L-shaped formwork In the earth construction method, the formwork may be deformed by earth pressure of embankment. Has been proposed (Patent Document 3).

  Reinforcement slope construction using L-shaped formwork As a method to avoid deformation of the formwork due to earth pressure of embankment, a reinforcing member is connected to the bottom part of the L-shaped formwork without using a slant tie material A method of carrying in the embankment material after letting it go is also proposed. Patent Document 4 proposes a method of joining a reinforcing net or sheet-like material to the bottom surface portion of an L-shaped formwork. In such a construction method, the embankment layer is divided by a net or a sheet to disperse the earth pressure of the embankment, thereby avoiding deformation of the L-shaped formwork.

  In the reinforcement slope construction method, the earth pressure of the embankment is large, and in order to avoid deformation of the L-shaped formwork, a slant tie material that joins the front and bottom parts of the L-shaped formwork, There has also been proposed a method of using both a reinforcing net or a sheet-like material bonded to the bottom portion of the mold (Patent Document 5). However, in the construction method using slant tie materials, a large number of slant tie materials are provided behind the front part of the L-shaped formwork. Since the operation is repeated, there is a problem that the number of work steps increases and it is difficult to achieve sufficient rolling pressure.

Japanese Patent Publication No. 63-11488 Japanese Utility Model Publication No. 6-40039 JP 2002-275900 A JP 2003-49433 A JP 2007-63790 A

  The present invention uses an L-shaped formwork that solves the problems of the prior art in the reinforcement slope construction method, and that can easily perform the rolling operation of the embankment, and the formwork is not easily deformed by the earth pressure after the embankment construction. The embankment reinforcement structure and the reinforcement slope construction method are provided.

The present invention is a substantially L-shaped mold having a front surface portion and a horizontal bottom surface portion standing upright, and the upper end portion of the front surface portion of the mold frame can be engaged with another mold frame located at the upper part. A sheet having a shape and a sheet-like object or a net-like object made of geotextile or geogrid connected to the bottom part and laid in a substantially horizontal direction, and in the middle in the vertical direction of the front part of the formwork It is a rod-shaped member that is coupled in the horizontal direction with a predetermined interval and arranged in a substantially horizontal direction, both ends are shaped by bending the rod-shaped member, and one end is a front portion of the L-shaped formwork It is a shape that can be joined, and the other end is a shape that can be driven into the embankment, and when the bending direction of the one end as viewed in the longitudinal direction of the anchor member is the vertical direction, the bending direction of the other end is the vertical direction. Bent at an angle of 45 to 90 degrees Ri, front part of the mold by the anchor member is a length 500~1000mm to provide embankment reinforcement structure is reinforced against earth pressure.

  The embankment reinforcement, wherein the anchor member is a rod-shaped member, one end of which is connected to the front surface portion of the L-shaped formwork, and the other end is driven into the embankment. Structure is a preferred embodiment of the invention.

  The embankment reinforcing structure in which a connecting rod for connecting to the anchor member substantially horizontally is disposed on the front side of the front surface portion of the L-shaped formwork is a preferred embodiment of the present invention.

The present invention is also a substantially L-shaped mold in section view having a front surface portion and a horizontal bottom surface portion standing on the ground or embankment, wherein the upper end portion of the front surface portion of the mold frame is located at the top. A front surface portion on which a formwork that can be engaged with the formwork and a sheet or net made of geotextile or geogrid connected to the bottom portion and laid in a substantially horizontal direction is placed. It is a member of a rod-like object , and both ends are shaped by bending the rod-like member, and one end is a shape that can be joined to the front part of the L-shaped formwork Yes, and the other end has a shape that can be driven into the embankment, and when the bending direction of the one end as viewed in the longitudinal direction of the anchor member is defined as the vertical direction, the bending direction of the other end is 45 to 45 mm in the vertical direction. It is bent at an angle of 90 degrees and has a length of 50 Implanting the one end of the anchor member is ~1000mm to fill the other end of the anchor member causes coupled to said front portion, continue to construction of embankment built a embankment reinforcement structure to the top of the mold frame, if necessary A slope-reinforcing embankment method for repeatedly constructing the embankment reinforcing structure is provided.

According to the present invention, there is provided an embankment reinforcement structure using an L-shaped formwork that can easily perform a rolling operation of the embankment and is difficult to deform the formwork by earth pressure after the construction of the embankment.
The present invention also provides a slope-reinforced embankment method that uses an L-shaped formwork that can easily perform the rolling and compacting work of the embankment and is less likely to be deformed by the earth pressure after the construction of the embankment.
According to the present invention, there are provided an embankment reinforcing structure and a slope reinforcing embankment method which are excellent in workability and difficult to be deformed by earth pressure, and which are excellent in economic efficiency.

It is the schematic which shows an example of an L-shaped formwork. It is the schematic which shows the example of an anchor member. It is the schematic which shows the process of constructing the embankment reinforcement structure of this invention. It is the schematic which shows the embankment reinforcement structure constructed by providing a connecting rod in an L-shaped formwork. It is the schematic which shows the slope reinforcement embankment method of this invention.

The present invention is a substantially L-shaped mold having a front surface portion and a horizontal bottom surface portion standing upright, and the upper end portion of the front surface portion of the mold frame engages with another mold frame located at the upper part. And a sheet-like object or a net-like object made of geotextile or geogrid connected to the bottom portion and laid in a substantially horizontal direction, and a vertical intermediate portion of the front portion of the formwork Is a member of a rod-like member that is joined in a horizontal direction with a predetermined interval and is arranged in a substantially horizontal direction, both ends are obtained by bending a rod-like member, and one end is the front surface of the L-shaped formwork The other end can be driven into the embankment and the other end can be bent vertically when the bending direction of the one end is the vertical direction when viewed in the longitudinal direction of the anchor member. Bent at an angle of 45-90 degrees to the direction And has, front part of the mold by the anchor member is a length 500~1000mm to provide embankment reinforcement structure is reinforced against earth pressure.

  As the mold of the present invention, a metal grid-form frame, an expanded metal formed by bending a diamond-shaped or turtle shell-shaped expanded metal into a substantially L shape, a welded wire mesh, Examples include a material such as a perforated plate and a precast plate formed into a substantially L shape. Among them, expanded metal and a lattice form are preferable in terms of strength, but a lattice form formed in a substantially L shape made of metal is particularly preferable.

The anchor member of the present invention is a rod-shaped member, one end of which is a shape that can be coupled to the front portion of the L-shaped form, and the other end is a shape that can be driven into the embankment layer. Thus, the front portion where the L-shaped form stands up and the embankment layer can be connected.
The material of the anchor member is not particularly limited, but is preferably made of metal and more preferably made of iron. An anchor member constituted by a round bar made of steel having a diameter of about 6 to 12 mm is a preferred embodiment.

Examples of the shape of the end portion that can be coupled to the standing front portion of the L-shaped form of the anchor member include a shape bent into a hook shape. The hook shape includes a bent shape like a fishhook, an L-shape, a U-shape, etc., and is engaged with a frame portion forming material constituting a lattice frame or a mesh of an L-shape mold. A shape that can be combined.
There is no particular limitation on the cross-sectional shape of the anchor member, and the cross-section can take a circular shape, an elliptical shape, a rectangular shape, or the like, but a circular cross-sectional shape is preferable.

  The end shape that can be driven into the embankment layer of the anchor member refers to a shape in which the end portion is bent at an angle with the embankment layer surface when the anchor member is leveled. Angle perpendicular to the surface of the embankment layer, that is, bent at 90 degrees with respect to the longitudinal direction of the anchor member, or bent with an acute angle with respect to the longitudinal direction at the other end direction of the anchor member Is an end shape that can be inserted into the embankment layer of a preferred anchor member. If the end of the anchor member that can be inserted into the embankment layer has a sharp tip, it can be easily driven into the embankment layer, so that the tip can also be shaped sharply.

It should be noted that the direction bent at the end that can be coupled to the standing front portion of the L-shaped form of the anchor member, and the direction bent at the end that can be inserted into the embankment layer of the anchor member Need not be parallel, but may be bent at an angle.
For example, the shape of the one end of the anchor member and the shape of the other end are shapes obtained by bending a rod-shaped member, and when viewed in the longitudinal direction of the anchor member, the bending direction at the one end is the vertical direction. The anchor member having a shape in which the bending direction at the other end is bent at an angle of 0 to 180, preferably 0 to 90 degrees, more preferably 30 to 90 degrees with respect to the vertical direction is preferable in the present invention. It is an aspect. An anchor member in which the bending direction at the other end is bent at an angle of 45 to 90 degrees with respect to the vertical direction is particularly preferable.

  The length of the anchor member of the present invention is desirably about 500 to 1000 mm, more preferably about 600 to 800 mm.

  The anchor member may be coupled to any one of the frame members constituting the mold in the longitudinal middle portion of the front portion of the L-shaped mold. When the L-shaped formwork is a lattice frame, the anchor member is connected to the vertical frame, the horizontal frame, or both at the position where the vertical frame and the horizontal frame intersect. It may be. In the case of a lattice frame, the density of the frame material can be increased at a position where the anchor members are expected to be coupled. For example, two horizontal frames can be arranged close to each other at a position where the anchor member is expected to be coupled.

  A connecting rod for connecting to the anchor member substantially horizontally can also be disposed on the front side of the front portion where the mold frame stands. The connecting rod is fixed to the front portion of the mold by being coupled with the anchor member, and the effect that the front portion where the mold rises is reinforced against earth pressure is obtained. Such a connecting rod is preferably made of a steel or plated metal round bar having a diameter of about 15 to 25 mm. The length should just be the same length as a formwork, for example, can be set as about 1000-3000 mm. In the case where there are adjacent L-shaped molds, the connecting rods may be coupled using a connecting rod and a coupling tool used there.

  The L-shaped formwork and anchor member of the present invention is an L-shape that can be used to prevent the anchor member inserted and fixed in the embankment layer from being deformed by the earth pressure of the embankment. Since the front part of the shape mold must be coupled to the anchor member, the configuration of the L-shaped form and the configuration of the anchor member are required to achieve the purpose.

  The anchor member of the present invention is joined to the longitudinal middle portion of the front portion of the L-shaped formwork at a predetermined interval in the transverse direction. At this time, it is preferable that about 3 to 5 anchor members are arranged at substantially equal intervals. The number of anchor members to be combined can be appropriately selected depending on the size and material of the L-shaped formwork.

  In the reinforced soil wall slope construction method of the present invention, first, the embankment material is carried in from the bottom surface portion of the substantially L-shaped mold in cross-sectional view and then compacted (rolled). In the middle of the front part of the formwork, build up the embankment layer to the position where the anchor member is joined, and then anchor the formwork and the built-up embankment layer using the anchor member at that position, and then the embankment After loading the material, it is compacted to complete the construction of the one-level embankment layer. Subsequently, the next level of the embankment layer can be constructed on top of the embankment layer constructed by the same construction operation. By repeating such an operation, a bank with a predetermined height can be constructed.

  According to the reinforced soil wall slope construction method of the present invention, it is easier to roll the embankment than a method using a slanted tie material, an efficient rolling operation can be performed, and sufficient rolling can be achieved. In addition, since the pressure of embankment on the L-shaped formwork can be reduced, the deformation of the L-shaped formwork can be prevented, and the height of the formwork is compared with the L-shaped formwork of the prior art. It can also be increased. As a result, the cost required for the formwork can be reduced, so that the reinforcing slope construction method of the present invention is an economically superior method.

  A reinforcing material may be bonded to the bottom surface portion of the L-shaped form of the present invention. As the reinforcing material, a known geotextile having a high tensile strength, a net-like material such as geogrid, or a sheet-like material can be used. Of these, a geogrid having excellent strength is preferred.

  The geogrid is made of a thermoplastic resin, in particular, a polyolefin such as polyethylene and polypropylene having excellent water resistance and chemical resistance, and a high strength uniaxially or biaxially stretched net is used. Although preferable. It is not limited to this. As for the mesh, various mesh shapes such as an elongated mesh that is a uniaxially stretched product and a square mesh that is a biaxially stretched product with a short side and a long side approximate to each other can be used. The size of the mesh is arbitrary, but when a particularly suitable uniaxially stretched product made of polyethylene is described, it is preferable to use one having a mesh size of about 15 to 30 mm in width and about 80 to 300 mm in length. Such polyolefin geogrids can be obtained from the market and used. For example, it is possible to exemplify those of each brand sold by the applicant under the trade name Tensor.

  Examples of the method of joining the L-shaped formwork and the reinforcing material of the present invention include a metal wire such as a string, a support bar, a binding band, and an iron wire, and reinforcing the formwork bottom part with an anchor pin. The materials can be bonded, but are not limited to these. When the reinforcing material is a mesh-like geogrid, the mesh end network of the geogrid can be curved and inserted into the gap at the bottom portion of the mold, and can be coupled to the insertion portion of the geogrid mesh through a support bar. Therefore, it is preferable to prepare a structure that can be connected to the geogrid on the bottom surface of the mold in order to connect to the bottom of the L-shaped formwork. For example, a part of the bottom surface in the cross-sectional view can be bent upward so as to be a shape that becomes a joiner holding portion for inserting a long joiner for connection with the geogrid. The shape of the joiner is not particularly limited, and the cross-sectional shape may be various shapes such as a circle, an ellipse, a rectangle, and a polygon. When combining an L-shaped formwork and a reinforcing material using a long joiner, it is a preferable aspect because it can reduce the cost and labor of the connection.

  It is preferable that the upper end part of the front surface part of the substantially L-shaped mold form in a sectional view of the present invention has a shape that can be engaged with the mold form located at the upper part. Such a shape is preferably a shape that is bent linearly or in a curved line at the upper end and can be engaged with the upper mold.

  In the reinforcing slope construction method according to the present invention, a geogrid may be disposed so as to be affixed to the inside of a substantially L-shaped mold form in cross section. Moreover, a vegetation sheet | seat can also be arrange | positioned inside the cross-sectional view substantially L-shaped formwork.

The reinforcement slope construction method of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view showing an example of a substantially L-shaped mold in a sectional view used in the reinforcing slope construction method of the present invention. FIG. 1 shows a mold 1 having a substantially L-shaped cross-sectional view, which has a front surface portion 2 and a horizontal bottom surface portion 3 that stand. The upper end portion of the front surface portion 2 is provided with a bent upper end portion 4 that can be engaged with a mold located on the upper portion.

  The upper end 4 of the mold 1 in FIG. 1 is bent outward once and then extends upward, and is engaged with the upper mold 4 by the upper end 4 of the bent structure. It has a structure that can. Further, the horizontal bottom surface portion 3 shows a state in which a joiner holding portion 5 for bending a part upward and connecting to the geogrid is formed.

  Further, the horizontal frame member located in the middle in the vertical direction of the mold front portion 2 of the mold 1 is arranged with a small interval. With such a frame material arrangement, the anchor member of the present invention is combined with a plurality of horizontal frame materials arranged with a small interval, thereby preventing deformation due to earth pressure of the embankment on the L-shaped form frame front surface portion. Resistance can be increased.

  FIG. 2A is a schematic view showing an example of the anchor member of the present invention. In FIG. 2, the rod-like anchor member 7 has a shape in which the end 71 is bent in a curved line. Since the curved portion is bent, the end portion 71 can be engaged with and coupled to the frame material of the L-shaped formwork. Further, the other end 72 of the anchor member is bent in a direction perpendicular to the rod-shaped material. By bending in the vertical direction, the end 72 of the anchor member can be driven into the embankment layer. It is possible to prevent the L-shaped formwork from being deformed by the earth pressure of the embankment by the anchor member 7 having the end portion 71 that can be joined to the frame material and the end portion 72 that can be driven into the embankment layer. it can. Since the end portion 72 that can be inserted into the embankment layer of the anchor member 7 has a pointed tip, it is easy to drive into the embankment layer.

  2B to 2D are views of the anchor member 7 viewed from the direction of the end portion 71. FIG. In (b), when the direction in which the end 71 is bent is defined as the vertical direction, the angle in which the end 72 is bent is zero degrees with respect to the vertical direction and is bent in the same direction. In (c), when the bending direction of the end portion 71 is the vertical direction, the angle α formed by the bending direction of the end portion 72 with respect to the vertical direction is about 45 degrees. When the end portion 71 is bent at an angle with respect to the end portion 72 as shown in (c), the end portion 71 intersects the vertical frame material of the mold frame or the horizontal and vertical frame materials. Can be bonded to both. (D) shows a mode in which the bending direction of the end portion 71 is a vertical direction, and the bending direction of the end portion 72 is 90 degrees with an angle α formed with respect to the vertical direction. When the end portion 71 is bent at an angle of 90 degrees with respect to the end portion 72 as shown in (d), the end portion 71 can be combined with the vertical frame member of the mold.

  FIG. 3 is a schematic view showing the steps of constructing the embankment reinforcement structure of the present invention. Place the L-shaped form 1 and the geogrid 8 connected to the bottom part 3 of the form 1 and laid in a substantially horizontal direction. After being compacted, the end portion 71 of the anchor member 7 is joined to the mold front surface portion 2 and the other end portion 72 of the anchor member is driven into the embankment layer. FIG. 3 shows a state in which the end of the anchor member is driven into the embankment layer in which the embankment is constructed and the anchor member is coupled to the frame material at the front part of the formwork. Then, after that, the embankment is constructed up to the upper end of the formwork to construct the embankment reinforcement structure. 3 The end 71 of the anchor member has a shape bent at an angle of 45 degrees with respect to the bending direction of the other end 72, and the point where the vertical frame member and the horizontal frame member of the mold 1 intersect. It is combined with both.

  FIG. 4 is a schematic view showing an example of a bank reinforcing structure constructed using a mold frame in which a connecting rod for coupling to an anchor member is arranged substantially horizontally on the front side of the front surface portion of the L-shaped mold frame. In FIG. 4, a connecting rod 14 is disposed on the front side of the front surface portion 2 of the L-shaped formwork 1 so as to be connected to the anchor member substantially horizontally, and the end of the anchor member 2 is connected to the connecting rod 14. The other end is driven into the embankment layer. Such a connecting rod can impart resistance to deformation due to earth pressure of the embankment on the front surface portion of the L-shaped formwork.

  FIG. 5 is a schematic view showing a slope constructed by the slope reinforced embankment method of the present invention. When constructing a reinforced soil wall slope using the L-shaped formwork 1, the formwork 1 is placed on the construction place ground 11 in front of the slope of the natural ground 12 which is a construction site. By inserting a long joiner 9 into a joiner holding part 5 provided on the formwork bottom face part 3, the geogrid 8 and the formwork bottom face part 3 are firmly connected. The other end of the geogrid 8 is tensioned and firmly fixed to the ground 11 by an anchor pin (not shown) or the like. In FIG. 5, a vegetation sheet 13 is disposed inside the mold 1. You may arrange | position a geogrid further inside the formwork 1 as needed.

The embedding material 10 is filled up to the middle position in the vertical direction of the mold front surface portion 2 on the mold bottom surface portion 3 and the geogrid 8 between the mold frame 1 and the slope of the natural ground 12, and then compacted. Subsequently, the end portion of the anchor member 7 is coupled to the front surface portion of the mold and the other end portion of the anchor member is driven into the embankment layer. After that, the first-stage embankment reinforcement structure is constructed by constructing embankment up to the upper end of the formwork. In FIG. 5, a mold frame is used in which horizontal frame materials are arranged at narrow intervals in the middle of the mold frame front surface portion 2 as shown in FIG. The end portion is a shape in which the end portion 71 is bent at an angle of 90 degrees with respect to the bending direction of the other end portion 72, and between two horizontal frame members arranged with a small interval, Combined with the vertical frame.
By repeating the above operations sequentially from bottom to top, a reinforced soil wall slope constructed in multiple stages is constructed.

The embankment reinforcement structure using the L-shaped formwork provided by the present invention is an embankment reinforcement structure in which the embankment can be easily rolled and the formwork is not easily deformed by earth pressure after the embankment is constructed.
The slope-reinforcing embankment method provided by the present invention is a slope-reinforcing embankment method that uses an L-shaped formwork that can easily perform the rolling work of the embankment and is less likely to deform by the earth pressure after the construction of the embankment. .
According to the present invention, there are provided an embankment reinforcing structure and a slope reinforcing embankment method which are excellent in workability and difficult to be deformed by earth pressure, and which are excellent in economic efficiency.

1. Formwork 2. Front part 3. Bottom portion 4. 4. Upper end part Joiner holding part6. Frame material 7. Anchor member 71. Anchor member end 1
72. Anchor member end 2
8). Geogrid9. Long joiner10. Filling material11. Ground 12. Chiyama 13 Vegetation sheet 14. Connecting rod

Claims (3)

A mold having a substantially L-shaped cross-sectional view having a standing front surface portion and a horizontal bottom surface portion, wherein the upper end portion of the front surface portion of the mold frame can be engaged with another mold frame located above. A mold and a sheet-like or net-like material made of geotextile or geogrid connected to the bottom portion and laid in a substantially horizontal direction, horizontally in the middle of the front portion of the mold in the vertical direction It is a rod-shaped member that is joined at a predetermined interval and arranged in a substantially horizontal direction, both ends are obtained by bending the rod-like member, and one end is a shape that can be joined to the front portion of the L-shaped formwork The other end is shaped to be driven into the embankment, and when the bending direction of the one end as viewed in the longitudinal direction of the anchor member is the vertical direction, the bending direction of the other end is 45 with respect to the vertical direction. Bent at an angle of ~ 90 degrees, long Embankment reinforcement structure the front portion is reinforced against earth pressure of the mold but by the anchor member is 500 to 1000 mm. 2. The embankment reinforcing structure according to claim 1, wherein a connecting rod for connecting with the anchor member substantially horizontally is disposed on the front side of the front surface portion of the L-shaped formwork. A substantially L-shaped mold in section view having a front surface portion and a horizontal bottom surface portion standing on the ground or embankment, and the upper end portion of the front surface portion of the mold frame is associated with another mold frame located at the upper part A form that is a shape that can be combined, and a sheet-like object or a net-like object made of a geotextile or a geogrid connected to the bottom surface portion and laid in a substantially horizontal direction, and a vertical intermediate position of the front surface portion It is a bar-shaped member , both ends are shaped by bending the bar-shaped member, one end is a shape that can be combined with the front part of the L-shaped formwork, and the other end is It is a shape that can be driven into the embankment, and when the bending direction of the one end as viewed in the longitudinal direction of the anchor member is the vertical direction, the bending direction of the other end is bent at an angle of 45 to 90 degrees with respect to the vertical direction. The length is 500-1000mm Implanted with to couple the one end portion of one anchor member to the front surface portion of the other end of the anchor member to fill, continue to construction of embankment built a embankment reinforcement structure to the top of the mold frame,該盛soil optionally Slope reinforcement embankment method that repeats construction of reinforcement structure.

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