JP6049442B2 - Embankment construction method and reinforced earth wall - Google Patents

Description

  The present invention relates to a banking construction method and a reinforced earth wall.

  As the temporary embankment structure that enables early restoration requiring emergency and the structure of the embankment that constructs the temporary embankment for construction, the filling material is packed at the tip of the planar reinforcing material laid in the embankment. A structure for fixing a bag-like restraint is known (see Patent Document 1). In the said structure, the restraint body was fixed to the planar reinforcement material by winding so that a restraint body might be wrapped from below with a planar reinforcement material.

JP 2009-281104 A

  Since the restraint body needs a constant weight in order to dam the embankment, it is formed in a large volume. In the structure of Patent Document 1, the planar reinforcing material has to be enlarged by the amount of the restraining body involved, resulting in an increase in cost. In addition, the work of winding the restraint body is not easy and requires a lot of labor and time. In particular, in restoration work such as roads that require urgency, the fact that much time and effort are required has caused delays in construction and has become a major problem.

  From such a viewpoint, it is an object of the present invention to provide a banking construction method and a reinforcing earth wall capable of easily connecting a restraint body and a planar reinforcing material and reducing the cost of the planar reinforcing material.

The present invention for solving such a problem includes a restraint body installation step of installing a bag-like restraint body packed with a filling material, and a planar reinforcing material on an existing embankment layer behind the restraint body. A surface reinforcing material laying step for laying, a connecting step of winding a belt around the restraint body and connecting both end portions of the belt member to the tip end portion of the surface reinforcing material, and a ground on the surface reinforcing material Embedding a material to form an embankment layer, and constructing the embankment by repeatedly performing the restraint body installation step, the planar reinforcing material laying step, the connection step, and the embedding step. It is a banking construction method.

  According to such a method, it is not necessary to wrap the planar reinforcing material itself around the restraint. Therefore, since the amount of the planar reinforcing material used can be reduced as compared with the conventional one, the cost can be reduced. Moreover, since a restraint body can be easily fixed using a belt member, the effort and time of a connection operation | work can be reduced.

  The invention according to claim 2 is a restraint body in which a bag body is filled with a filling material, a planar reinforcing material laid in the embankment, and a belt member that connects the restraint body and the planar reinforcing material. The belt member is wound around the restraint body, and both ends of the belt member are connected to the planar reinforcing material.

  According to such a configuration, similarly to the first aspect, the cost can be reduced and the labor and time of the connecting work can be reduced.

  In the invention which concerns on Claim 3, the said belt member is connected to the plate member which clamps the front-end | tip part of the said planar reinforcement material from the front and back. According to such a configuration, the belt member can be easily fixed to the planar reinforcing material.

  In the invention which concerns on Claim 4, the said belt member is connected to the bar material latched by the part which turned up the front-end | tip part of the said planar reinforcement material, It is characterized by the above-mentioned. According to such a configuration, the fixing strength between the planar reinforcing member and the bar can be increased, and the belt member can be easily fixed to the planar reinforcing member.

  In the invention which concerns on Claim 5, the said belt member is connected to the front-end | tip part of the said planar reinforcement material through the metal-mesh member provided with the hook, It is characterized by the above-mentioned. According to such a configuration, the area of the planar reinforcing material can be further reduced, and the belt member can be easily fixed to the planar reinforcing material.

  According to the present invention, the restraint body and the planar reinforcing material can be easily connected, and the cost of the planar reinforcing material can be reduced.

It is the figure which showed the reinforced earth wall which concerns on 1st embodiment of this invention, Comprising: (a) is a top view, (b) is a sectional side view. (A)-(f) is the sectional side view which showed each process of the embankment construction method which concerns on 1st embodiment of this invention. It is a sectional side view of the embankment constructed by the embankment construction method according to the first embodiment of the present invention. It is the figure which showed the reinforced earth wall which concerns on 2nd embodiment of this invention, Comprising: (a) is a top view, (b) is a sectional side view. It is the figure which showed the reinforced earth wall which concerns on 3rd embodiment of this invention, Comprising: (a) is a top view, (b) is a sectional side view. It is the top view which showed the other attachment structure of the planar reinforcing material and the belt member.

  Hereinafter, an embankment construction method and a reinforced earth wall according to a first embodiment of the present invention will be described with reference to the accompanying drawings. First, the embankment structure and the reinforcing earth wall constructed by the embankment construction method will be described.

  As shown in FIG. 3, the embankment structure 1 is formed using a reinforced earth wall 2. The reinforcing earth wall 2 includes a planar reinforcing material 25 laid on the restraining body 10 and the embankment layer 20, and a connecting member 30.

  The restraining body 10 is configured by a large sandbag in which a filling material such as earth and sand is packed in a bag body. The restraint 10 has, for example, a quadrangular prism shape or a cylindrical shape with chamfered corners, and has a height of about 1 meter. A plurality of restraining bodies 10 are provided, and a plurality of restraining bodies 10 are juxtaposed in the horizontal direction along the tip of the embankment structure 1 and are stacked in a plurality of stages in the vertical direction. The upper restraint body 10 is arranged in a state offset from the lower restraint body 10 to the embankment layer 20 side (the base end side of the embankment structure 1).

  The embankment layer 20 is formed by rolling (compacting) a ground material such as earth and sand laid on the back side of the restraint body 10 (base end side of the embankment structure 1). A plurality of embankment layers 20 are stacked. Each embankment layer 20 includes an embankment lower layer portion 21 and an embankment upper layer portion 22.

  The embankment lower layer portion 21 is located below the planar reinforcing material 25 and is a portion from the bottom surface of the restraining body 10 to a height of approximately ¼. The embankment upper layer portion 22 is located above the planar reinforcing material 25 and is a portion from a height of approximately ¼ to the upper surface of the restraint body 10.

  The planar reinforcing material 25 is laid in the embankment structure 1 and prevents the ground material from collapsing by generating a frictional force with the ground material. The planar reinforcing material 25 is interposed between the embankment lower layer portion 21 and the embankment upper layer portion 22. The planar reinforcing member 25 is a belt-like sheet member formed by combining thread-like members made of, for example, a polymer fiber material in a lattice shape, and is installed horizontally. The planar reinforcing material 25 extends from the back surface of the restraining body 10 toward the rear (the base end side of the embankment layer 20).

  As shown in FIG. 1, the connecting member 30 is a member that connects the restraining body 10 and the planar reinforcing member 25. The connecting member 30 includes a plate member 31, a bracket 32, a turn buckle 33, and a belt member 34.

  The plate member 31 is provided above and below the tip of the planar reinforcing material 25. The plate member 31 is formed longer than the width dimension of the planar reinforcing member 25, and both longitudinal ends protrude from the widthwise opposite ends of the planar reinforcing member 25. The pair of plate members 31, 31 are fastened by bolts and nuts, and sandwich the tip of the planar reinforcing material 25. There is no restriction | limiting in the material of the plate member 31, As long as it has the intensity | strength required for fixing the belt member 34 and winding the restraint body 10, it may be made of steel and may be made of wood.

  The bracket 32 connects the plate member 31 and the turnbuckle 33, and is provided at both ends of the plate member 31. One end of the bracket 32 is fixed to a protruding portion of the end portion in the longitudinal direction of the plate member 31. A hook of the turnbuckle 33 is locked to the other end of the bracket 32. There is no restriction | limiting in the material of the bracket 32, The strength required in order to fix the belt member 34 and to wind the restraint body 10 should just be provided.

  A pair of turnbuckles 33 are provided and are respectively locked to the pair of brackets 32. The turnbuckle 33 includes a hook portion at both ends and an intermediate tightening portion. The hook portion has a male screw portion and the tightening portion has a female screw portion. The turnbuckle 33 can change the overall length by rotating the fastening portion so that the hook portions at both ends move in the axial direction.

  In this embodiment, the planar reinforcing member 25 has a width dimension equivalent to that of the restraining body 10, and the plate member 31 is formed to have a length slightly longer than the width dimension of the planar reinforcing member 25 and the restraining body 10. However, it is not limited to this. The planar reinforcing member 25 may have a width dimension corresponding to the plurality of restraining bodies 10, 10..., And the plate member 31 can be fixed to the plurality of restraining bodies 10, 10. It may be formed to have continuity in the width direction. For example, the plate member 31 is preferably slightly longer than the width of the three restraining bodies 10, 10, 10. In this case, the bracket 32 can be attached to the plate member 31 at the width dimension pitch of the restraining body 10.

  The belt member 34 is a member that is wound around the side surface portion of the restraining body 10, and is configured by, for example, a belt-like rope. Both ends of the belt member 34 are connected to hook portions of the turnbuckle 33, respectively. The belt member 34 of the present embodiment is wound around the restraint 10 at a height that is approximately ¼ of the height of the restraint 10. The winding height of the belt member 34 can be changed as appropriate. There is no restriction | limiting in the material of the belt member 34, The intensity | strength which can hold | grip the restraint body 10 and the softness | flexibility which can follow the side surface of the restraint body 10 should just be provided. In the drawing, the belt member 34 is separated from the restraining body 10, but is actually in close contact with the side surface portion of the restraining body 10.

  The attachment structure of the belt member 34 is not limited to the above structure, and may be a structure in which the bracket 32 and the turnbuckle 33 are omitted. For example, the end portion of the belt member 34 may be folded back and fixed to the belt surface, and the brate member 31 may be hooked so as to be wound. Further, a belt through hole may be formed in the plate member 31, and the belt member 34 may be hooked through the belt through hole, or a belt through metal fitting for the plate member 31 may be attached and the belt member 34 may be hooked through the belt member 34. May be. In this case, the belt member 34 is provided with, for example, a length adjusting bracket called “Koki” so that the belt length can be adjusted.

  Next, the embankment construction method will be described with reference to FIG. The embankment construction method of the present embodiment includes a restraint body installation process, a lower embankment process, a planar reinforcing material laying process, a connection process, and an embankment process.

(Restraining body installation process)
The restraint body installation step is a step of arranging a plurality of restraint bodies 10, 10... As shown in FIG. The restraining bodies 10 are arranged in a horizontal line without any gap along the ground 3 at the tip of the construction position of the embankment structure 1. In the lowermost embankment layer 20, the restraining body 10 is installed on the ground 3. In the upper embankment layer 20, the restraining body 10 is installed on the lower restraining body 10 (see FIG. 2D). Note that there may be a plurality of rows of the restraints 10 depending on the weight of the restraints 10 and the amount of embankment on the back surface.

(Lower embankment process)
The lower embankment step is a step of forming the embankment lower layer portion 21 by depositing a ground material behind the lower portion of the restraining body 10. The embankment lower layer portion 21 is formed by spreading and rolling the ground material on the ground 3 between the restraint 10 and the existing slope 4 and rolling. The embankment lower layer portion 21 is formed so as to have the same height as about ¼ from the bottom surface of the restraint body 10 after the ground material is piled and rolled. In the lowest embankment layer 20, the embankment lower layer portion 21 is formed on the ground 3, but in the upper embankment layer 20, the restraining body 10 is installed on the lower embankment upper layer portion 22 (see FIG. 2D). ).

(Surface reinforcing material laying process)
The planar reinforcing material laying step is a step of laying the planar reinforcing material 25 on the embankment lower layer portion 21 (existing embankment layer) as shown in FIG. The planar reinforcing member 25 is laid so as to extend from the back surface of the restraining body 10 toward the existing slope 4.

(Linking process)
The connecting step is a step of connecting the restraint body 10 and the planar reinforcing member 25. In the connecting step, first, the connecting member 30 is installed at the tip of the planar reinforcing material 25. Specifically, the front end portion of the planar reinforcing member 25 is sandwiched between the plate members 31 and 31 from above and below and tightened with bolts and nuts, and one end portion of each bracket 32 is fixed to both longitudinal ends of the plate member 31. The other end of the bracket 32 faces the restraint body 10 side. Thereafter, the turnbuckles 33 and 33 are locked to the other end portions of the brackets 32, respectively. The belt member 34 is wound horizontally along the side surface portion of the restraining body 10. The belt member 34 may be wound around the restraint 10 in advance, or may be wound after the restraint 10 is installed. When the belt member 34 is wound around the restraint body 10 in advance, a belt thread may be provided on the side surface of the restraint body 10 and the belt member 34 may be inserted into the belt thread.

Then, both end portions of the belt member 34 are connected to the end portions of the turnbuckles 33 and 33, respectively, and the turnbuckle 33 is tightened. As a result, the restraint 10 is gripped by the belt member 34.
In addition, what is necessary is just to install the belt members 34 and 34 wound around the adjacent restraint bodies 10 and 10 by shifting height suitably.

(Filling process)
As shown in FIG. 2C, the embedding process is a process of forming the embankment upper layer portion 22 by depositing a ground material on the upper rear side of the restraint body 10. The embankment upper layer portion 22 is formed by spreading and rolling the ground material on the planar reinforcing material 25 between the restraint 10 and the existing slope 4 and rolling it. In the present embodiment, the upper embankment lower layer portion 21 is simultaneously formed together with the embankment upper layer portion 22 in the upper embankment step. If it does in this way, the lower embankment process of the upper embankment layer can be omitted. In the embankment process, only the embankment upper layer portion 22 may be formed, and the upper embankment lower layer portion 21 may be formed later.

  The embankment layer 20 is constructed by the above steps. Then, as shown to (d)-(f) of FIG. 2, the above-mentioned series of processes (restraint body installation process-embankment process) are performed, and the 2nd embankment layer 20 is constructed | assembled. By repeating the above series of steps, the embankment layer 20 is laminated to construct the embankment. In the embankment process of the uppermost embankment layer 20a, after embedding and rolling the ground material, the height of the embedding layer 20a is approximately the same as the height of ¼ from the bottom surface of the restraint body 10 to form only the embankment upper layer portion 22. To do.

  According to the embankment construction method and the reinforcing earth wall 2 as described above, the planar reinforcing member 25 only needs to extend to the front side of the restraining body 10, and the area can be reduced as compared with the conventional one. Therefore, the usage amount of the planar reinforcing material 25 can be reduced, and the cost can be reduced.

  Moreover, since the belt member 34 is wound around the restraint body 10 along the side surface of the restraint body 10, the restraint body 10 can be fixed easily. Thereby, the labor and time of the connection work between the restraint 10 and the planar reinforcing member 25 can be reduced. Thereby, it is possible to quickly construct a temporary embankment structure that enables early recovery that requires an emergency, and a embankment that constructs a temporary embankment for construction.

  Moreover, in this embodiment, since the front-end | tip part of the planar reinforcement 25 is clamped from the front and back by the plate members 31 and 31, the plate members 31 and 31 can be fixed to the planar reinforcement 25 easily and firmly, The belt member 34 fixed to the member 31 can also be easily and firmly fixed to the planar reinforcing material 25. Furthermore, since the belt member 34 is fixed to the plate member 31 via the bracket 32 and the turnbuckle 33, the belt member 34 can be easily tightened, and the restraining body 10 can be securely fixed. .

  Next, a reinforced earth wall according to a second embodiment of the present invention will be described with reference to FIG. The reinforcing earth wall 2 a according to the second embodiment connects the restraint body 10 and the planar reinforcing material 25 by the connecting member 35. The connecting member 35 includes a bar 36, a bracket 37, a turnbuckle 33, and a belt member 34, and the belt member 34 is connected to the planar structure 25.

The bar 36 is inserted inside the portion where the tip of the planar reinforcing member 25 is folded back. The rod member 36 is formed longer than the width dimension of the planar reinforcing member 25, and both longitudinal ends protrude from the widthwise opposite ends of the planar reinforcing member 25. The material of the bar 36 is not limited, and may be made of steel or wooden as long as it has the strength necessary for fixing the belt member 34 and winding the restraint 10. Also good.

  In the folded portion 26 of the planar reinforcing material 25, the tip of the folded surface is welded to the upper surface of the planar reinforcing material 25. Note that the structure for fixing the folded surface is not limited to welding. For example, the tip of the folded surface may be wrapped with the upper surface of the planar reinforcing member 25 with a predetermined wrap length, or the tip of the folded surface with a U-shaped hook, a driving pin, a binding wire (not shown), or the like. The portion may be locked to the planar reinforcing material 25.

  The bracket 37 connects the bar 36 and the turnbuckle 33. The brackets 37 are provided at both ends of the bar 36, respectively. One end of the bracket 37 is fixed to the protruding portion of the end of the bar 36 in the longitudinal direction. A hook of the turnbuckle 33 is locked to the other end of the bracket 37. There is no restriction | limiting in the material of the bracket 37, The strength required in order to wind the restraint body 10 while fixing the belt member 34 should just be provided.

  In the present embodiment, the bar 36 is formed to have a length that is slightly longer than the width of the planar reinforcing member 25 and the restraint 10, but the present invention is not limited to this. The bar 36 may be formed to a length that can fix a plurality of (for example, three) restraints 10, 10,... To provide continuity in the width direction. In this case, brackets 37 can be attached to the bar 36 at the width dimension pitch of the restraint 10.

  As long as the belt member 34 is provided with a length adjusting bracket so that the belt length can be adjusted, the bracket 37 and the turnbuckle 33 may be omitted.

  According to the reinforced earth wall 2a having the above-described configuration, the same effect as that of the first embodiment can be obtained, and the rod member 36 can be wound around the folded portion 26 at the tip of the planar reinforcing member 25 and fixed. Therefore, the bar 36 does not come off the planar reinforcing member 25.

  Next, a reinforcing earth wall according to a third embodiment of the present invention will be described with reference to FIG. In the reinforced earth wall 2b according to the third embodiment, the restraint body 10 and the planar reinforcing member 25 are connected by a locking connecting member 40. The locking connection member 40 includes a wire mesh member 41, a hook 42, a bar 43, a turnbuckle 33, and a belt member 34, and the belt member 34 is connected to the planar structure 25.

  The metal mesh member 41 is a planar member having a width equivalent to that of the planar reinforcing member 25. A part of the base end side of the metal mesh member 41 is disposed so as to overlap the planar structure 25.

  The hook 42 has an L shape. One end of the hook 42 extends horizontally and is welded to the base end of the wire mesh member 41 (the end on the planar reinforcing material 25 side). The other end portion of the hook 42 extends vertically, passes through the grid of the planar reinforcing material 25, and is stuck in the embankment lower layer portion 21. A plurality of hooks 42 are provided, and are arranged at a predetermined pitch in the width direction of the wire mesh member 41.

  The bar 43 is welded to the tip of the wire mesh member 41 (end on the restraint 10 side). The bar 43 is formed longer than the width dimension of the wire mesh member 41, and both longitudinal ends of the bar 43 protrude from both ends of the wire mesh member 41 in the width direction. An engaging portion for engaging the turnbuckle 33 is formed on the protruding portion of the end portion of the bar 43 in the longitudinal direction, and the hook of the turnbuckle 33 is engaged with this engaging portion.

  In the present embodiment, the planar reinforcing member 25 has a width dimension equivalent to that of the restraining body 10, and the bar 43 is formed to have a length slightly longer than the width dimensions of the planar reinforcing member 25 and the restraining body 10. However, it is not limited to this. The planar reinforcing member 25 may have a width dimension corresponding to a plurality of restraining bodies 10, 10,..., And the bar 43 may be composed of a plurality of (for example, three) restraining bodies 10, 10,. -May be formed in a length that can be fixed to provide continuity in the width direction. In this case, the bar 43 is formed with a locking portion for locking the turnbuckle 33 at the width dimension pitch of the restraining body 10.

  If the belt member 34 is provided with a length adjusting bracket so that the belt length can be adjusted, the structure in which the locking portion and the turnbuckle 33 are omitted may be used.

  According to the reinforced earth wall 2b having the above configuration, the same effect as that of the first embodiment can be obtained, and the area of the planar reinforcing member 25 can be further reduced. Furthermore, by forming the locking connecting member 40 in advance, at the construction site, the locking connecting member 40 is placed on the planar reinforcing member 25 and the hook 42 is driven, so that the planar reinforcing member 25 and The locking connecting member 40 can be easily connected.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not the meaning limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention. For example, in the first embodiment, the height of the embankment lower layer portion 21 is approximately ¼ of the height of the restraining body 10, but can be changed as appropriate. Moreover, in the said embodiment, although the belt member 34 winds the restraint body 10 in a horizontal state, you may make it incline so that a front end side may become an upper side.

  Furthermore, in the said embodiment, although the belt member 34 was attached to the planar reinforcement 25 via the turnbuckle 33, it is not limited to this. As shown in FIG. 6, the belt member 34 may be attached to the planar reinforcing member 25 via a joint belt 50 extending in the width direction of the planar reinforcing member 25. The joint belt 50 is made of, for example, a fiber material of a polymer material equivalent to the planar reinforcing material 25. The joint belt 50 extends in the width direction of the planar reinforcing member 25 and has a length dimension equivalent to the width dimension of the planar reinforcing member 25. A belt member 34 is sewn by a sewing thread 51 at both ends in the length direction of the joint belt 50 (width direction of the planar reinforcing material 25). A plurality of through holes 52 are formed in the joint belt 50 at predetermined intervals along the length direction. The joint belt 50 is fixed to the planar reinforcement member 25 by tying the binding rope 55 through the binding holes 55 and the lattice portions of the through holes 52 and the planar reinforcement member 25 located at both ends in the length direction. According to the reinforced earth wall 2c having such a configuration, the belt member 34 is fixed to the planar reinforcing member 25 using the joint belt 50, so that the outer surface of the restraining body 10 is not damaged.

  The fixing of the joint belt 50 and the planar reinforcing material 25 is not limited to the binding rope 55, and the joint belt is sewn to the planar reinforcing material with a sewing thread (not shown) instead of the binding rope 55. May be attached. Moreover, you may fix a joint belt to a planar reinforcement with both a binding rope and a sewing thread.

  Furthermore, in the said embodiment, although the planar reinforcement 25 is formed one layer at a time with respect to the one-stage restraint body 10, it is not limited to this. Depending on the design conditions, a plurality of layers of planar reinforcing material may be provided for one stage of the restraint body. In this case, it is preferable to provide a connecting member on each planar reinforcing member and fix the restraint in a multistage state.

DESCRIPTION OF SYMBOLS 1 Embankment structure 2 Reinforced earth wall 20 Embankment layer 21 Embankment lower layer part 22 Embankment upper layer part 25 Planar reinforcement 34 Belt member

Claims (5)

A restraint body installation step of installing a bag-like restraint body filled with filling material;
A planar reinforcing material laying step of laying a planar reinforcing material on the existing embankment layer behind the restraint;
A connecting step of winding a belt around the restraint, and connecting both ends of the belt member to the tip of the planar reinforcing material ;
A banking step of forming a banking layer by depositing a ground material on the planar reinforcing material,
An embankment construction method comprising constructing an embankment by repeatedly performing the restraint body installation step, the planar reinforcing material laying step, the connection step, and the embankment step. A restraint body filled with a filling material in the bag body, a planar reinforcing material laid in the embankment, and a belt member connecting the restraint body and the planar reinforcing material,
The belt member is wound around the restraint,
Both ends of the belt member are connected to the planar reinforcing material. The reinforced earth wall according to claim 2, wherein the belt member is connected to a plate member that sandwiches a front end portion of the planar reinforcing material from the front and back sides. The reinforced earth wall according to claim 2, wherein the belt member is connected to a bar member that is locked to a portion where a tip end portion of the planar reinforcing member is folded back. The reinforced earth wall according to claim 2, wherein the belt member is connected to a front end portion of the planar reinforcing member via a wire mesh member having a hook.

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