JP4117205B2 - Lightweight embankment structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lightweight embankment structure formed by stacking resin foams as lightweight embankment materials in multiple stages, and in particular, a lightweight embankment characterized by the structure of wall surfaces arranged in multiple stages along the side surfaces of the accumulated lightweight embankment materials. Concerning the structure.
[0002]
[Prior art]
As one of embankment methods on soft ground or landslide land, a lightweight embankment structure using a resin foam as a lightweight embankment material is known. This structure is widely used in various civil engineering works because it exhibits excellent effects in terms of cost reduction for ground improvement, shortening the construction period, and improving earthquake resistance. In order to protect the resin foam and prevent deterioration, wall surfaces are attached to the side surfaces of the resin foams stacked in multiple stages. Conventionally, many types of wall materials have been proposed. For example, Patent Document 1 (Japanese Patent Laid-Open No. 10-168909) discloses a lightweight embankment that does not use an H-shaped steel as a structural material. In the structure, a structure has been proposed in which an attachment member is inserted between stacked lightweight embankment materials, and a wall surface material is directly attached to the tip of the attachment member. Patent Document 2 (Japanese Patent Laid-Open No. 2002-317446) discloses a vertical groove that runs in the vertical direction on the back surface of the wall material so that the wall material is not affected by the sinking of the resin foam that is an elastic-plastic material. The tip of the mounting member inserted between the resin foams to be stacked is locked in the vertical groove so as to be slidable in the vertical direction, and the wall surface material is attached to the side surface of the resin foam. Things have been proposed. In the above structure, the wall material and the attachment that attaches it to the lightweight embankment are separate members, and while there are many advantages such as absorption of subsidence, there is a disadvantage that the number of parts at the construction site increases. is there.
[0003]
In Patent Document 3 (Japanese Patent Laid-Open No. 2000-8378), as shown in FIG. 4, a retaining surface 12b (corresponding to a “rise body” in the present invention) and a horizontal support 12a (“horizontal support in the present invention”). Is formed integrally with a porous steel plate such as expanded metal, and the horizontal support 12a is placed on the foamed resin block 11 and attached to the foamed resin block 11 using the anchor pins 16. A lightweight embankment structure is described. This structure has an advantage that the number of parts applied to the wall surface material can be reduced. Further, by filling the space between the earth retaining surface 12b and the side surface of the foamed resin block 11 with the earth and sand 20 and using a vegetation sheet, it is extremely effective as a slope greening method.
[0004]
[Patent Document 1]
JP-A-10-168909 [Patent Document 2]
JP 2002-317446 A [Patent Document 3]
Japanese Patent Laid-Open No. 2000-8378
[Problems to be solved by the invention]
The structure described in JP 2000-8378 A has many advantages as a lightweight embankment structure. However, the wall surface material 12 is fixed by driving the anchor pin 16 to the upper surface of the foamed resin block 11 stacked in a step shape and close to the side surface, and filling the earth and sand 20 on the side wall surface. When an unexpectedly large load is applied to the part, the fixing of the wall material by the anchor pin 16 may be shifted or disconnected. Therefore, in this structure, the reinforcing sheet 17 is developed on the upper surface of the foamed resin block 11, the horizontal support 12a of the wall surface material 12 and the reinforcing sheet 17 are fixed by the anchor pins 16, and the ground of the developed reinforcing sheet 17 is also provided. The mountain side position (the region pressed by the upper foamed resin block 11) is further fixed by the anchor pin 16.
[0006]
For this reason, a part called a reinforcing sheet 17 is necessary, and further, an operation of driving the anchor pin 16 toward the foamed resin block 11 is necessary in order to fix it. Furthermore, it is difficult to avoid the head of the anchor pin 16 to which the reinforcing sheet 17 is fixed protruding from the upper surface of the foamed resin block 11, and if the upper foamed resin block 11 is stacked as it is, unevenness occurs. And may lack stability. This unevenness cannot be ignored when the foamed resin blocks 11 are stacked in multiple stages. For this purpose, a recess 11b into which the head of the anchor pin 16 can be fitted is formed on the back surface of the upper resin block 11. However, it is possible to align the head of the anchor pin 16 and the recess 11b that are driven in at the construction site. Not easy.
[0007]
The present invention has been made in view of the above circumstances, and in a lightweight embankment structure using a wall material in which a horizontal support and a rising body are integrally formed, with a small number of parts and a small number of work steps, An object of the present invention is to provide a further improved lightweight embankment structure that can stably fix the wall surface material to a lightweight embankment material.
[0008]
[Means for Solving the Problems]
The lightweight embankment structure according to the present invention is a lightweight embankment structure in which resin foams are stacked in a multi-stage as a lightweight embankment material, a finishing structure material such as a roadbed is arranged on the upper surface, and a wall material is arranged in a multi-stage along the side surface. The wall material is a body in which a horizontal support and a rising body are integrally formed, and the horizontal support is located on the upper surface of a lightweight embankment located at a lower position. The vicinity of the end is fixed to the lightweight banking material by driving a fastener, and the upper lightweight banking material is placed on the lower lightweight banking material so as to cover the driving position of the fastener. It is characterized by being.
[0009]
In the above-mentioned lightweight embankment structure, the wall material is arranged so that the horizontal support portion is placed on the upper surface of the light-weight embankment material positioned at the lower position, and the lightweight embankment is located near the rear end portion of the horizontal support body. A fastener is driven into the material to fix the wall material. Next, the upper lightweight banking material is placed on the lower lightweight banking material so as to cover the clamped fastener. With this operation, the fixing of the embedding material to the lightweight embankment is completed.
[0010]
In the lightweight embankment structure of the present invention, the horizontal support is fixed to the lower lightweight embankment material by the fastener at the position where the wall material enters the ground mountain side of the light embankment material, and the upper lightweight material is further disposed thereon. It will be in the state where the embankment material was put. Therefore, the fixing of the wall surface material is stable as it is, and even when an unexpected load is applied, the fixing state with the fastener does not become unstable. Moreover, not only the number of work processes required is small, but the number of parts is very small, only the backing material and the fixture.
[0011]
In the lightweight embankment structure according to the present invention, the side surface of the stacked lightweight embankment material may be a vertical surface or a stepped slope. In the latter case, a light-weight embankment structure with a beautiful slope is obtained by arranging the wall materials in multiple stages so that the rising body forms a slope that follows the stair-like slope of the light-weight embankment material. Can do. Moreover, in this structure, since the wall surface material with a deep horizontal support body is used as an embedding material, the fixed state of the wall surface material becomes more stable.
[0012]
As described above, when the horizontal support portion of the wall material placed on the lower lightweight embankment material and the head of the fastener for fixing it are raised from the surface of the lightweight embankment material, Unevenness occurs between the lightweight embankment material to be placed. In addition, the lower lightweight embankment material and the upper lightweight embankment material have a part that becomes a line contact or a point contact, and the part is finally crushed by the overload and becomes a stable surface contact state. This is not preferable because the light weight embankment material is damaged in the process. In order to avoid this, a notch recess having a depth that can accommodate the horizontal support portion of the wall material to be positioned on the upper surface of the lower lightweight embankment material and the head of the fastener used for fixing the wall support material. It is desirable to form. In construction, after fixing with the fasteners, leveling is filled in the notch recess so as to be substantially at the same level as the other upper surface portions. Thereby, since the lower lightweight embankment material and the upper lightweight embankment material will be in the state of surface contact from the beginning of construction, it can avoid effectively that the lightweight embankment material is damaged by an overload. Examples of the leveling material include soil, sand, empty kneaded mortar, mortar, or a mixture thereof. Alternatively, it may be a metal or plastic plate. Of these, soil and sand excellent in on-site workability, or a mixture thereof is particularly preferable.
[0013]
In the present invention, other conditions are arbitrary on the condition that the wall material is integrally formed with the horizontal support and the rising body. The rising body may be a wall surface itself or a support frame for attaching another wall surface. The horizontal support may be a single flat plate or two or more flat plate members extending in the horizontal direction. Further, in a state where the wall surface material is attached, the back surface of the rising body and the side surface of the lightweight embankment material may be in contact with each other or close to each other, or may have a required space. In the latter case, by embedding a suitable non-combustible material (such as rock wool or glass wool) into the non-combustible material, the lightweight embankment material is deformed or deformed due to a high temperature such as a mountain fire. It is possible to reliably prevent disappearance.
[0014]
Preferably, the wall surface material is formed of a porous steel plate such as expanded metal, welded wire mesh, punching metal, a vegetation sheet is attached along at least the rising body of the wall surface material, and the rising surface of the wall surface material and the side surface of the lightweight embankment material The space is filled with earth and sand. In this embodiment, there is an advantage that side greening can be performed simultaneously with the protection of the lightweight embankment material. When performing side greening, arrange the embedded materials located in multiple stages in order so that the upper edge of the rising body located in the lower position protrudes laterally from the lower edge of the rising body located in the upper position. As a result, rainwater can be reliably supplied to the earth and sand filled in the space between the rising body of the wall material at each stage and the side surface of the lightweight embankment material.
[0015]
In the lightweight embankment structure according to the present invention, a resin foam such as EPS (foamed polystyrene), urethane foam, or FCB (lightweight foamed concrete), which is used in the conventional lightweight embankment method, is appropriately used as the lightweight embankment material. However, in consideration of workability, it is preferable to use an EPS block.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of an embodiment of a lightweight embankment structure according to the present invention, and FIG. 2 is a perspective view for explaining a fixed state between a wall surface material and a lightweight embankment material. This light weight embankment structure, like the conventionally known light weight embankment structure, is a resin foam that is, for example, an EPS block 2 stacked on the ground 1 in a vertical direction as a light weight embankment material. On the upper surface, a finishing structure material such as a roadbed is constructed. And the side material 3 in this invention is attached to the side surface in multiple steps also in the up-down direction. In the illustrated example, the EPS blocks 2 are stacked such that the side surfaces form a stepped inclined surface, but may be formed as vertical side surfaces.
[0017]
As shown in FIG. 2, in this example, each wall surface material 3 is formed by bending an expanded metal coated with hot dip galvanizing or polyethylene, for example, so that a horizontal horizontal support 3a and one of the horizontal supports 3a It has a substantially L-shaped cross section having a rising body 3b that is raised upward in an inclined state with respect to the horizontal support 3a at an acute angle from the side edge. The rising body 3b is in an inclined state that matches the stepwise inclination of the stacked EPS blocks 2. Note that this inclination is not necessary when the EPS blocks 2 are stacked so as to form a vertical side surface. In any case, the vertical distance from the horizontal support 3a to the upper end of the rising body 3b is made equal to the height of each EPS block 2.
[0018]
Although not necessarily essential, in the illustrated example, the rising bodies 3b of the wall members 3 are supported on the horizontal support 3a by a pair of support rods 3c arranged at appropriate intervals in the horizontal direction. Has been. Furthermore, there is a case where an appropriate vegetation sheet known in the art is pasted on the rear surface of the rising body 3b.
[0019]
As shown in FIG. 2, the EPS block 2 </ b> A that is most stacked in the Tanikawa has a cutout recess 4 on the upper surface on the side surface side. The depth of the notch recess 4 is increased by the thickness of the horizontal support 3 a of the wall surface material 3.
[0020]
At the time of construction, necessary ground maintenance is performed and the EPS block 2 at the bottom is laid down. At that time, the EPS block 2A having the notch recess 4 shown in FIG. Further, as shown in FIG. 1, a lowermost wall member 3A is disposed on the side of the EPS block 2A. At that time, the ground portion of the region in which the horizontal support 3a of the wall surface material 3A is to be placed is dug somewhat deeply, the horizontal support 3a of the wall surface material 3A is placed there, and a fastener 5 such as an anchor pin. Is fixed in the wall 3A. The depth of the excavation is set to such a depth that the head of the fastener 5 that is driven in does not protrude from the level of the support ground.
[0021]
After fixing the wall surface material 3A with the fastener 5, the sand as the leveling material 6 is spread on the horizontal support 3a until it becomes the same level as the level of the support ground. After that, the EPS block 2A of the most Tanigawa is arranged, and earth and sand 7 are filled in the space S between the rising body 3b of the wall surface material 3A and the side surface of the EPS block 2A. In addition, the filling of the earth and sand 7 is an operation required when side greening is performed, and when it is not performed, it may be left empty or may be filled with an appropriate non-combustible heat insulating material such as rock wool. . In that case, it is desirable to attach a conventionally known wall body made of appropriate lightweight concrete or the like to the front surface of the rising body 3b.
[0022]
Next, the second stage is constructed. As shown in FIG. 2, the horizontal support 3a of the wall surface material 3 is placed in the notch recess 4 formed in the first-stage EPS block 2A. At this time, as shown in FIG. 1, the second-stage wall material 3 is formed so that the rising body 3b of the lowermost wall material 3A and the rising body 3b of the second-wall material 3 form a continuous slope. Perform positioning. In this state, the fastener 5 is driven in the vicinity of the rear end side (natural mountain side) of the horizontal support 3a to fix the wall surface material 3A to the EPS block 2A. Note that the depth of the notch recess 4 is set to such a depth that the head 5a of the clamped fastener 5 does not protrude from the upper surface level of the EPS block 2A. Further, as shown in FIG. 1, when the upper EPS block 2A is stacked thereon, the depth is such that at least the fixing portion of the fastener 5 can be covered with the upper EPS block 2A. It is said.
[0023]
After fixing the wall material 3 with the fastener 5, the sand as the leveling material 6a is spread on the horizontal support 3a until the level becomes the same as the upper surface level of the EPS block 2A, and then the wall material in the first step As in the case of 3A, earth and sand 7 are filled in the space S between the rising body 3b and the side surface of the EPS block 2A. The remaining EPS block 2 is also laid down. Hereinafter, the same work is repeated for the required number of steps, and finally, the light weight embankment in the present invention is performed by constructing a finished structure such as a concrete floor slab or a roadbed like the conventional light weight embankment structure. The structure is complete.
[0024]
As described above, in the lightweight embankment structure of the present invention, the horizontal support 3a is fixed by the fastener 5 at the position where the wall surface material 3 (3A) enters the ground block side of the EPS block 2A which is a light embankment material, Furthermore, since the upper EPS block 2A is placed thereon, it is possible to firmly fix the wall surface material 3 to the lightweight embankment without using a fixing auxiliary member as in the conventional reinforcing sheet. it can.
[0025]
FIG. 3 is a sectional view showing another embodiment of the lightweight embankment structure according to the present invention. In this embodiment, the wall material of each step is not positioned so that the rising body 3b of the lower wall material 3 and the rising body 3b of the upper wall material 3 form a continuous slope, but the wall surface of each step This is different from that shown in FIG. 1 in that the material is positioned such that a gap P is formed between the rising bodies 3b. In this embodiment, rainwater can be reliably supplied to the earth and sand 7 filled in the space S between the rising body 3b of the wall material at each stage and the side surface of the EPS block 2A, particularly when the side surface is greened. It becomes a suitable form.
[0026]
In the above embodiment, the wall surface material 3 is formed by bending a hot-dip galvanized or polyethylene-coated expanded metal. However, the present invention is not limited to this. For example, the wall surface material 3 is formed by bending a wire mesh. Alternatively, the punching metal may be bent. Further, the sand 6 as an example of the leveling material 6 is described as what is laid in the notch recess 4, and the sand 7 is filled with the space S between the rising body 3b and the side surface of the EPS block 2A. Of course, both can be sand or earth and sand as long as the objective can be achieved.
[0027]
【The invention's effect】
As described above, in the lightweight embankment structure of the present invention, the horizontal support is fixed by the fastener at the position where the wall material enters the ground mountain side of the lightweight embankment material, and the upper lightweight embankment structure thereon. Therefore, the wall material can be firmly fixed to the lightweight embankment with a small number of parts and a small number of work steps, without using a fixing auxiliary member as in the reinforcing sheet as in the prior art. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of an embodiment of a lightweight embankment structure according to the present invention.
FIG. 2 is a perspective view illustrating a fixed state between a wall surface material and a lightweight embankment material.
FIG. 3 is a cross-sectional view showing a main part of another embodiment of a lightweight embankment structure according to the present invention.
FIG. 4 is a diagram for explaining an example of a conventional lightweight banking structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Ground, 2, 2A ... Lightweight embankment material (EPS block), 3, 3A ... Side face material, 3a ... Horizontal support body, 3b ... Standing body, 4 ... Notch recessed part, 5 ... Fastener, 6 ... Leveling material ( Sand), 7 ... earth and sand

Claims (3)

It is a lightweight embankment structure in which resin foams are stacked in multiple stages as lightweight embankment materials, finishing structure materials such as roadbeds are arranged on the upper surface, and wall surface materials are arranged in multistage along the side surfaces,
The wall material is formed by integrally forming a horizontal support and a rising body, and the horizontal support is located on the upper surface of the lightweight embankment located below, and the vicinity of the rear end of the horizontal support is fastened. It is fixed to the lightweight embankment material by driving in a tool, and the upper lightweight embankment material is placed on the lower lightweight embankment material so as to cover the driving position with the fastener ,
On the upper surface of the lower lightweight embankment material is formed a notch recess with a depth that can accommodate the horizontal support of the wall material located there and the head of the fastener used to fix it, and the other upper surface portion A light-weight embankment structure characterized in that the notch recess is filled with a leveling material so as to be at substantially the same level as the above .   Lightweight embankment materials are piled up in steps so that the side faces become slopes, and the wall materials are arranged in multiple stages so that the rising body forms slopes along the staircase sides of the lightweight embankment materials The lightweight embankment structure according to claim 1. The wall material is formed of a porous steel plate, a vegetation sheet is attached along at least the rising body of the wall material, and the space between the rising body of the wall material and the side surface of the lightweight embankment is filled with earth and sand. The lightweight embankment structure according to claim 1 or 2 , wherein

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