JP-2026075923-A - Storage structure and method for constructing the storage structure

Abstract

[Problem] To provide a storage structure that reduces the scattering of heavy metal-containing soil from the embankment, prevents leachate from flowing out from the sides of the embankment, and has a retaining wall that can be reused after demolition. [Solution] The storage structure 1A comprises a support 4, a retaining wall 5 surrounding a predetermined area on the support 4, and heavy metal-containing soil 3 contained in the area surrounded by the retaining wall 5. The retaining wall 5 has a first wall surface portion 5a erected on the support 4 and in contact with the heavy metal-containing soil 3, a second wall surface portion 5b erected on the support 4, spaced apart from the first wall surface portion 5a and surrounding the first wall surface portion 5a, and a filler material 5c filled in the space between them. The portion of the first wall surface portion 5a that contacts the heavy metal-containing soil 3 is made of metal or resin. The density of the filler material 5c is greater than the density of the heavy metal-containing soil 3. [Selection Diagram] Figure 2

Inventors

• 伊藤 圭二郎
• 反り目 好男

Assignees

• 鹿島建設株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (7)

1. A support structure laid almost horizontally, A retaining wall is placed on the support and surrounds a predetermined area on the support, A storage structure comprising: soil containing heavy metals, etc., contained in an area surrounded by the aforementioned retaining wall, The retaining wall comprises a first wall portion erected on the support and in contact with the heavy metal-containing soil, a second wall portion erected on the support and spaced apart from the first wall portion and surrounding the first wall portion, and a filler material filled in the space between the first wall portion and the second wall portion. The first wall portion and the second wall portion each have a base portion that extends along the direction in which the first wall portion and the second wall portion are aligned with the filler material in between, and a rising portion that rises upward from the base portion. The first wall portion is made of metal or resin in the part that comes into contact with the soil containing heavy metals, etc. A storage structure in which the density of the filling material is greater than the density of the soil containing heavy metals, etc.
2. The storage structure according to claim 1, wherein the support is an adsorption layer that adsorbs heavy metals and the like.
3. The storage structure according to claim 1, wherein the filling material is solidified soil obtained by solidifying the heavy metal-containing soil with a cement-based solidifying agent.
4. The storage structure according to claim 1, wherein both the first and second wall sections each have a plurality of support columns arranged in the direction surrounding the retaining wall, and wall materials provided in each of the first and second wall sections to connect adjacent support columns.
5. The storage structure according to claim 1, wherein at least one of the first wall portion and the second wall portion has an anchor protruding toward the filler material.
6. A method for constructing a storage structure according to claim 1, The first wall section and the second wall section are erected on the support structure laid in a substantially horizontal direction. The space between the first wall portion and the second wall portion is filled with the filler material. A construction method for containing heavy metal-containing soil in an area surrounded by the aforementioned retaining wall.
7. After the heavy metal-containing soil has been placed inside, a plurality of support columns are provided on both the first and second wall sections, arranged in the direction surrounding the retaining wall. In each of the first and second wall sections, a wall material is provided between adjacent support columns. The construction method according to claim 6, wherein the space whose height has been increased by providing the wall material is further filled with the filler material.

Description

This invention relates to a storage structure and a method for constructing a storage structure. During tunnel construction and other excavation projects, rocks and soil containing heavy metals are generated. These excavated materials are temporarily stored until a disposal or reuse site is determined. While the excavated materials are temporarily stored, rainwater and other elements can come into contact with them, potentially leaching heavy metals. Therefore, preventing the diffusion of heavy metals into the surrounding environment is a critical challenge. To address this issue, one possible solution is to use an adsorption mat, such as the one disclosed in Patent Document 1. This adsorption mat consists of a permeable bag filled with an adsorbent material. By temporarily placing excavated soil on top of this adsorption mat, heavy metals and other substances contained in the leachate can be captured by the adsorbent material, thus preventing them from flowing downwards. Patent No. 6320313 This is a plan view of a storage structure according to one embodiment of the present invention.This is a cross-sectional view taken along line II-II in Figure 1.(A) is a plan view of the wall section, and (B) is a front view of the wall section.This is a magnified view of a portion of Figure 2, illustrating the static frictional force of the retaining wall and the sliding force of the soil containing heavy metals, etc.This is a cross-sectional view of a storage structure according to another embodiment. The following describes preferred embodiments of the present invention in detail with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are omitted. In the present invention, "heavy metals, etc." refers to cadmium, hexavalent chromium, cyanide, mercury, selenium, lead, arsenic, fluorine, boron, and their compounds, which are classified as Class II specified hazardous substances under the Soil Contamination Countermeasures Act. Therefore, "heavy metals, etc." is a concept that also includes cyanide, arsenic, fluorine, and boron. "Soil containing heavy metals, etc." refers to rocks and soil containing "heavy metals, etc." <Storage Structure> As shown in Figures 1 and 2, the storage structure 1A of this embodiment has a structure in which heavy metal-containing soil 3 is contained in a storage facility 2A. The storage facility 2A consists of a support 4 laid in a place where the heavy metal-containing soil 3 is temporarily stored, and a retaining wall 5 placed on the support 4 and surrounding a predetermined area on the support 4. The storage structure 1A is constructed by filling the area surrounded by the retaining wall 5 with heavy metal-containing soil 3. The retaining wall 5 forms a rectangular ring in plan view. The shape of the ring is arbitrary and may be a circle or an ellipse, for example, or it may be an irregular shape that matches the shape of the site. The support structure 4 is an adsorption layer 4A that adsorbs heavy metals and other substances. Specifically, the adsorption layer 4A is an adsorption mat in which an adsorbent material is filled into a flexible and water-permeable bag. It is preferable to lay the adsorption layer 4A approximately horizontally. The retaining wall 5 consists of a first wall surface 5a that contacts the heavy metal-containing soil 3, a second wall surface 5b that is spaced apart from and surrounds the first wall surface 5a, and a filler material 5c that fills the space between the first wall surface 5a and the second wall surface 5b. Both the first wall surface 5a and the second wall surface 5b are erected on the adsorption layer 4A. The first wall portion 5a has a first base portion 5aa that extends in the direction in which the first wall portion 5a and the second wall portion 5b are aligned with the filler material 5c in between, and a first rising portion 5ab that rises upward from the first base portion 5aa. Similarly, the second wall portion 5b has a second base portion 5ba that extends in the direction in which the first wall portion 5a and the second wall portion 5b are aligned with the filler material 5c in between, and a second rising portion 5bb that rises upward from the second base portion 5ba. At least the portion of the first wall portion 5a that contacts the heavy metal-containing soil 3 is made of metal or resin. The first base portion 5aa and the second base portion 5ba are members that allow the first wall portion 5a and the second wall portion 5b to withstand horizontal loads, and they protrude in a direction perpendicular to the surrounding direction (circumferential direction of the ring) of the retaining wall 5. The shape of the protruding portion may be rod-shaped or plate-shaped. The first rising portion 5ab and the second rising portion 5bb are members that form a space to secure the volume of the filler material 5c. In this embodiment, the first rising port