JP2004293133A - Lightweight banking structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight banking structure in which wall face materials are fixed to the lightweight banking soil with a less number of parts and working processes without use of stationary reinforcing members like a reinforcing sheet in conventional cases. <P>SOLUTION: A wall face material 3 that a horizontal support body 3a and a rising body 3b are integrally assembled is fixed to the upper face of a lightweight banking soil 2 located in the lower position by retainers 5. In this time, the upper lightweight banking soil 2 is placed on the lower lightweight banking soil so as to cover the driven position of the retainers 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lightweight embankment structure constructed by stacking resin foams as lightweight embankment materials in multiple stages, and in particular, a lightweight embankment characterized by the structure of wall materials arranged in multiple stages along the sides of the stacked lightweight embankment materials. Related to the structure.
[0002]
[Prior art]
BACKGROUND ART As one of embankment construction methods on soft ground or landslides, a lightweight embankment structure using a resin foam as a lightweight embankment material is known. This structure has been widely used in various civil engineering works because it has excellent effects in reducing costs for ground improvement, shortening the construction period, improving earthquake resistance, and the like. On the side surfaces of the resin foams stacked in multiple stages, wall materials are attached in multiple stages to protect the resin foams and prevent deterioration. Conventionally, many types of wall materials have been proposed. For example, Patent Literature 1 (Japanese Patent Application Laid-Open No. H10-168909) discloses a lightweight embankment that does not use an H-beam as a structural material. In a structure, there has been proposed a structure in which a mounting member is inserted between stacked lightweight embankment materials, and a wall material is directly mounted on a tip of the mounting member. Patent Document 2 (Japanese Patent Application Laid-Open No. 2002-317446) discloses a vertical groove running vertically on the back surface of a wall material so that the wall material is not affected by sinking of an elastic-plastic resin foam. The front end of the mounting member inserted between the resin foams to be stacked is slidably locked in the vertical groove in the vertical direction, and the wall material is attached to the side surface of the resin foam. Things have been suggested. The above structure has a wall material and a fixture for attaching it to the lightweight embankment are separate members, and while there are many advantages such as sinking, there is a disadvantage that the number of parts at the construction site increases. is there.
[0003]
Patent Document 3 (Japanese Patent Application Laid-Open No. 2000-8378) discloses, as shown in FIG. 4, a retaining surface 12b (corresponding to a “rising body” in the present invention) and a horizontal support 12a (a “horizontal support in the present invention”). Is formed integrally with a perforated 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 the advantage that the number of parts on the wall 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]
JP 2000-8378 A
[Problems to be solved by the invention]
The structure described in JP-A-2000-8378 has many advantages as a lightweight embankment structure. However, the wall material 12 is fixed by driving the anchor pin 16 into a position close to the side surface of the foamed resin block 11 stacked in a stepped manner, and filling the side wall surface with the soil 20. 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 removed. For this purpose, in this structure, the reinforcing sheet 17 is spread on the upper surface of the foamed resin block 11, the horizontal support 12a of the wall member 12 and the reinforcing sheet 17 are fixed with the anchor pins 16, and the ground of the expanded reinforcing sheet 17 is fixed. The position on the mountain side (the area pressed by the upper foam resin block 11) is further fixed by the anchor pin 16.
[0006]
For this purpose, a component called a reinforcing sheet 17 is required, and further, an operation of driving the anchor pin 16 toward the foamed resin block 11 to fix the component is required. Further, it is difficult to prevent the head of the anchor pin 16 to which the reinforcing sheet 17 is fixed from protruding from the upper surface of the foamed resin block 11. And may lack stability. When the foamed resin blocks 11 are stacked in multiple stages, this irregularity cannot be ignored. For this purpose, a concave portion 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 not possible to align the head of the anchor pin 16 and the concave portion 11b that have been driven in the construction site. Not easy.
[0007]
The present invention has been made in view of the above-described 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 work process, It is an object of the present invention to provide a further improved lightweight embankment structure capable of stably fixing the wall material to the lightweight embankment material.
[0008]
[Means for Solving the Problems]
A lightweight embankment structure according to the present invention is a lightweight embankment structure in which resin foam is stacked in multiple stages as lightweight embankment material, and a finishing structure material such as a roadbed is disposed on the upper surface thereof, and wall materials are arranged in multiple stages along side surfaces. A horizontal support and a rising body formed integrally with each other, wherein the horizontal support is located on the upper surface of a lower-level light embankment material, and The vicinity of the end is fixed to the lightweight embankment material by driving a fastener, and the upper lightweight embankment material is placed on the lower lightweight embankment material so as to cover the driving position with the fastener. It is characterized by having.
[0009]
In the above-mentioned lightweight embankment structure, at the time of construction, a wall material is arranged on the upper surface of the lower-level lightweight embankment material so as to place the horizontal support portion, and the lightweight embankment is located near the rear end of the horizontal support body. The fastener is driven into the material to fix the wall material. Next, the upper lightweight embankment material is arranged on the lower lightweight embankment material so as to cover the driven fastener. In this operation, the fixing of the embedding material to the lightweight embankment is completed.
[0010]
In the light-weight embankment structure of the present invention, the wall material is fixed to the lower light-weight embankment material with a fastener at a position where the light-weight embankment enters the ground side of the light-weight embankment material. The embankment material will be on it. Therefore, the fixing of the wall material is stable as it is, and the fixing state with the fastener does not become unstable even when an unexpected load is applied. Further, not only the number of required working steps is small, but also the number of parts is very small because only the backing material and the fixture are used.
[0011]
In the lightweight embankment structure according to the present invention, the side surfaces of the piled lightweight embankment material may be a vertical surface or a step-like slope. In the latter case, to obtain a lightweight embankment structure with a beautiful slope by arranging the wall material in multiple stages so that the rising body forms a slope that follows the step-shaped slope of the lightweight embankment material Can be. Further, in this configuration, since the wall material having the horizontal support having a large depth is used as the embedding material, the fixed state of the wall material is further stabilized.
[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 rises above the surface of the lightweight embankment material, Unevenness occurs with the lightweight embankment material to be placed. In addition, the lower lightweight embankment material and the upper lightweight embankment material have a line contact or point contact portion, which is finally crushed by the overload and is brought into a stable surface contact state. It is not preferable because the lightweight embankment material is damaged in the process. In order to avoid this, a notch recess is provided on the upper surface of the lower lightweight embankment material, the horizontal support portion of the wall material to be located there and the head of the fastener used for fixing the same. Is desirably formed. Then, at the time of construction, after fixing with the fasteners, leveling is filled into the cutout recess so as to be substantially at the same level as the other upper surface portion. Thereby, since the lower lightweight embankment material and the upper lightweight embankment material are in surface contact from the beginning of construction, damage to the lightweight embankment material due to the overload can be effectively avoided. Examples of the leveling material include earth, sand, kneaded mortar, mortar, and the like, and a mixture thereof. Alternatively, a metal or plastic plate may be used. Among these, soil and sand excellent in workability at the site, or a mixture thereof are particularly preferable.
[0013]
In the present invention, other conditions for the wall material are arbitrary, provided that the horizontal support and the rising body are integrally formed. The rising body may be the wall body itself or a support frame for attaching another wall body. The horizontal support may also be a single flat plate, or may be two or more flat plate-like members extending in the horizontal direction. Also, with the wall material attached, the back surface of the rising body and the side surface of the lightweight embankment material may be in contact with or in proximity to each other, or may have a required space. In the latter case, by embedding an appropriate non-combustible material that functions as a heat insulating material (such as rock wool or glass wool), the lightweight embankment material may be deformed or deformed due to high temperatures such as a mountain fire. Disappearance can be reliably prevented.
[0014]
Preferably, the wall material is formed of a perforated steel sheet such as expanded metal, welded wire mesh, or punched metal, a vegetation sheet is attached along at least the rising body of the wall material, and the rising body of the wall material and the side surface of the lightweight embankment material Fill the space with earth and sand. In this form, there is an advantage that the side greening can be performed simultaneously with the protection of the lightweight embankment material. When performing side greening, the embedding materials located in multiple stages are sequentially arranged such that the upper edge of the rising body located at the lower position becomes a position protruding laterally from the lower edge of the rising body located at the upper position. It is desirable that the rainwater be reliably supplied to the earth and sand filled in the space between the rising body of the wall material of each step 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 (expanded polystyrene), urethane foam, or FCB (lightweight foamed concrete), which is used in a conventional lightweight embankment method, is appropriately used as a lightweight embankment material. However, considering workability, it is preferable to use an EPS block.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a 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 illustrating a fixed state of a wall material and a lightweight embankment material. In this lightweight embankment structure, similarly to a conventionally known lightweight embankment structure, a resin foam, for example, an EPS block 2 is stacked on the ground 1 as a lightweight embankment material in multiple stages in the vertical direction. On the upper surface, a finishing structural material such as a roadbed is constructed. Then, the side members 3 of the present invention are also mounted on the side surface in multiple stages in the vertical direction. In the illustrated example, the EPS blocks 2 are stacked so that the side surfaces form a stepwise inclined surface, but may be vertical side surfaces.
[0017]
As shown in FIG. 2, in this example, each wall material 3 is formed by bending an expanded metal coated with, for example, hot-dip galvanized or polyethylene to form a horizontal support 3 a and one of the horizontal supports 3 a. It has a substantially L-shaped cross section having a rising body 3b that rises 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. This inclination is not necessary when the EPS blocks 2 are stacked so as to form vertical side surfaces. 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]
In addition, in the illustrated example, the rising body 3b of each wall member 3 is supported on the horizontal support 3a by a pair of support rods 3c arranged at appropriate intervals in the horizontal direction, although not necessarily essential. Have been. Furthermore, there is a case where a suitable vegetation sheet, which is not shown, or is conventionally known, is attached to the rear surface of the rising body 3b.
[0019]
As shown in FIG. 2, the EPS block 2 </ b> A that is most stacked on the valley has a cutout recess 4 on the upper surface on the side surface side. The depth of the cutout recess 4 is made larger by the thickness of the horizontal support 3 a of the wall material 3.
[0020]
At the time of construction, necessary ground maintenance is performed, and the lowermost EPS block 2 is spread. At this time, the EPS block 2A having the cutout recess 4 shown in FIG. Further, as shown in FIG. 1, a lowermost wall material 3A is arranged on the side of the EPS block 2A. At this time, the ground portion of the area where the horizontal support 3a of the wall material 3A is to be placed is dug somewhat deeper, and the horizontal support 3a of the wall material 3A is placed there, and a fastener 5 such as an anchor pin is provided. Into the ground to fix the wall material 3A. The depth of the digging is such that the head of the driven fastener 5 does not protrude from the level of the supporting ground.
[0021]
After fixing the wall material 3A with the fastener 5, sand as the leveling material 6 is spread over the horizontal support 3a until the level becomes the same as the level of the supporting ground. Thereafter, the EPS block 2A of the highest Tanigawa is placed, and the space S between the rising body 3b of the wall material 3A and the side surface of the EPS block 2A is filled with earth and sand 7. Note that the filling of the earth and sand 7 is an operation required when performing the greening of the side surface, and when not performing the greening, may be left in an empty space or may be filled with a suitable non-combustible heat insulating material such as rock wool. . In that case, it is desirable to attach a conventionally known wall 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 material 3 is placed in the cutout recess 4 formed in the first-stage EPS block 2A. At this time, as shown in FIG. 1, the second-stage wall member 3 is formed such that the rising member 3b of the lowermost wall member 3A and the rising member 3b of the second-stage wall member 3 form a continuous slope. Perform positioning. In this state, the fastener 5 is driven into the vicinity of the rear end side (ground side) of the horizontal support 3a to fix the wall material 3A to the EPS block 2A. In addition, the depth of the cutout recess 4 is set to a depth such that the head 5a of the driven fastener 5 does not protrude from the upper surface level of the EPS block 2A. Further, as shown in FIG. 1, the depth is such that when the upper EPS block 2A is stacked thereon, at least the fixing portion of the fastener 5 can be covered by 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 it reaches the same level 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, the space S between the rising body 3b and the side surface of the EPS block 2A is filled with earth and sand 7. The remaining EPS blocks 2 are also spread. Hereinafter, for the required number of steps, the same work is repeated, and finally, as in the case of the conventional lightweight embankment structure, by performing the finishing structure such as a concrete floor slab or a roadbed, the lightweight embankment in the present invention The structure is completed.
[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 material 3 (3A) enters the ground side of the EPS block 2A which is the lightweight embankment material, Further, since the upper EPS block 2A is placed thereon, it is possible to securely fix the wall material 3 to the lightweight embankment without using a fixing auxiliary member as in a 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. This is different from that shown in FIG. 1 in that the material is positioned so that a gap P is formed between the rising members 3b. In this mode, 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 of each step and the side surface of the EPS block 2A, and particularly when greening the side surface. It becomes a suitable form.
[0026]
In the above embodiment, the wall material 3 is formed by bending an expanded metal coated with hot-dip galvanized or polyethylene. However, the present invention is not limited to this. For example, the wall material 3 is formed by bending a wire net. Alternatively, it may be formed by bending a punching metal. Also, what is laid in the notch recess 4 is sand 6 as an example of the leveling material 6, and what fills the space S between the rising body 3 b and the side surface of the EPS block 2 A is earth and sand 7. Naturally, both can be sand or earth and sand as long as the object can be achieved.
[0027]
【The invention's effect】
As described above, in the lightweight embankment structure of the present invention, the wall material is fixed to the horizontal support at the position where it enters the ground side of the lightweight embankment material by the fastener, and further, the upper lightweight embankment structure is placed thereon. As a result, 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 a conventional reinforcing sheet. .
[Brief description of the drawings]
FIG. 1 is a 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 of a wall material and a lightweight embankment material.
FIG. 3 is a sectional view showing a main part of another embodiment of the lightweight embankment structure according to the present invention.
FIG. 4 is a diagram illustrating an example of a conventional lightweight embankment structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Ground, 2, 2A ... Lightweight embankment material (EPS block), 3, 3A ... Side material, 3a ... Horizontal support, 3b ... Standing body, 4 ... Notch concave part, 5 ... Fastener, 6 ... Leveling material ( Sand), 7 ... earth and sand

Claims (4)

A lightweight embankment structure in which a resin foam is stacked in multiple stages as a lightweight embankment material, and a finishing structure material such as a roadbed is disposed on an upper surface thereof, and a wall material is arranged in multiple stages along side surfaces, The horizontal support and the rising body are integrally formed, the horizontal support is located on the upper surface of the lightweight embankment material located below, and the vicinity of the rear end of the horizontal support drives the fastener The light-weight embankment is fixed to the light-weight embankment material, and the light-weight embankment material is placed on the light-weight embankment material below so as to cover the driving position of the fastener. Structure. The lightweight embankment material is stacked in steps so that the side surface becomes a slope, and the wall material is arranged in multiple steps so that the rising body forms a slope along the stepwise side surface of the lightweight embankment material. The lightweight embankment structure according to claim 1, wherein On the upper surface of the lower lightweight embankment material, there is formed a notch concave portion having a depth capable of accommodating the horizontal support of the wall material located there and the head of the fastener used for fixing the same. 3. The lightweight embankment structure according to claim 1, wherein the notch recess is filled with a leveling material so as to have a level substantially the same as that of the embankment. The wall material is formed of a porous steel sheet, 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 material is filled with earth and sand. The lightweight embankment structure according to any one of claims 1 to 3, wherein:

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