JP4329054B2 - Frame support structure with clay-based waterstop - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure that supports underground structures such as buildings and structures such as structures buried in the ground in the ground, and in particular, a structure using a clay-based waterproofing material that is difficult for groundwater to penetrate. It relates to the improvement of the support structure.
[0002]
[Prior art]
In general, structures such as underground facilities of buildings and underground facilities are directly supported by the ground. However, when the water content of the ground is high, the groundwater can be prevented from entering the facility, or the harmful substances stored in the facility can be prevented from leaking into the ground due to the groundwater. For this purpose, a support structure using a clay-based waterstop material is employed. This is to support or support the frame by filling or laying a clay-based water-stopping material that is difficult for groundwater to permeate between the frame and the ground of the structure.
[0003]
FIG. 5 shows a support structure in which the clay-based waterstop material 1 is filled between the underground portion of the building frame 10 and the ground G. The clay-based waterstop material 1 is filled with a sufficient thickness over the bottom and the entire circumference of the casing 10. FIG. 7 shows an underground burying structure of a cylindrical disposal facility in which a large number of waste materials 21 containing harmful substances are enclosed. In this case, a clay system is disposed between the entire housing 20 of the disposal facility and the ground G. The water blocking material 1 is filled or laid with a sufficient thickness. Examples of the clay-based waterstop material 1 include bentonite alone or a mixture of bentonite mixed with sand or gravel.
[0004]
[Problems to be solved by the invention]
However, in the clay-based waterstop material, plastic deformation flow and viscous flow are generated by receiving the load of the structure. For this reason, in the building support structure shown in FIG. 5, as shown in FIG. 6, there is a possibility that the building will tilt due to uneven settlement due to plastic deformation flow and viscous flow. In addition, in the disposal facility shown in FIG. 7, it is required to isolate the waste in the ground for a long period of time such as 1000 years or 10,000 years, but the clay-based waterstop material at the bottom gradually becomes thinner due to viscous flow. As a result, the required water stopping performance may not be obtained. The arrows in the clay-based waterstop material in FIGS. 6 and 7 indicate the direction of the viscous flow generated in the clay-based waterstop material.
[0005]
Therefore, in the present invention, when supporting the skeleton in the ground with the clay-based water-stopping material, the plastic deformation flow and the viscous flow generated in the clay-based water-stopping material are suppressed, and the support force that ensures the support force stably over a long period of time Its purpose is to provide a structure.
[0006]
[Means for Solving the Problems]
The present invention is a structure for supporting a structural body on a clay-based waterstop laid at the bottom of an underground ground, and the clay-based waterstop is laid directly under the housing, and this clay-based waterstop In the horizontal space formed between the side wall of the underground ground, a viscous flow suppression body that suppresses plastic deformation flow and viscous flow of the clay-based waterstop material is filled and embedded so as to surround the bottom of the frame. It is characterized by having.
[0007]
According to the present invention, the plastic deformation flow and the viscous flow of the clay-based water-stopping material subjected to the load of the structural body are transferred to the lateral space formed between the clay-based water-stopping material and the side wall of the underground ground. It is suppressed by the viscous flow suppressing body embedded so as to surround the bottom of the housing . Therefore, the supporting force of the clay-based waterstop material is ensured stably over a long period of time. Moreover, since the thickness of a clay-type water stop material does not fluctuate naturally, the water stop performance which a clay-type water stop material has is ensured similarly.
[0008]
As the viscous flow suppressing body of the present invention, a block aggregate in which a hardly water-permeable material is filled or sandwiched in gaps between a number of highly water-permeable and highly rigid blocks is preferably used. Here, clay is preferably used as the hardly water-permeable material.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1) First Embodiment FIG. 1 shows a building support structure according to a first embodiment of the present invention. At the bottom of the excavated underground ground G, a clay-based water blocking material 1A is laid to a predetermined thickness, and a building frame 10 is constructed thereon. The laying range of the clay-based water-stopping material 1A is a portion immediately below the housing 10, and the thickness thereof is set to a thickness at which the water-stopping performance of the clay-based water-stopping material 1A itself is sufficiently exhibited. As the clay-based water blocking material 1A, bentonite alone or a mixture of bentonite with sand or gravel is preferably used. And between 1 C of clay-based waterstop materials and the side wall G1 of the underground ground G, the block accumulation body (viscous flow suppression body) 2 is embed | buried at the substantially same height as 1A of clay-type waterstop materials. The block assembly 2 is embedded in a rectangular shape so as to surround the bottom of the housing 10.
[0010]
As shown in FIG. 2, the block integrated body 2 is formed by integrating a plurality of rectangular parallelepiped blocks 2a and filling a gap between the blocks 2a with a hardly water-permeable material 2b. As the block 2a, hard rock, which is a natural ground material with extremely low water permeability, is preferably used. Moreover, as the hardly water-permeable material 2b, a clay-based water-stopping material (clay) similar to the clay-based water-stopping material 1A is preferably used. Although not shown, the space between the underground ground G and the frame 10 above the block aggregate 2 is filled with a clay water-stopping material similar to the clay water-stopping material 1A.
[0011]
The clay-based waterproofing material 1A laid between the frame 10 and the underground ground G is uniformly consolidated and subsidized by receiving the load of the frame 10 to increase its density, and the settlement ends with increased rigidity. To do. In the clay water-stopping material 1A, the viscous flow in the lateral direction is suppressed by the block aggregate 2 embedded in the periphery. For this reason, the plastic deformation flow and the viscous flow that are squeezed in the lateral direction by the load of the housing 10 do not occur. Therefore, the support force of the casing 10 by the clay water-stopping material 1A is stably secured over a long period of time, and the problem that the casing 10 tilts due to uneven settlement is avoided. Moreover, since the thickness of the clay-based water blocking material 1A remains unchanged as designed, the water blocking performance of the clay-based water blocking material 1A is also ensured.
[0012]
(2) Second Embodiment FIG. 3 shows an underground burying structure of a disposal facility according to a second embodiment of the present invention. On the bottom of the excavated underground ground G, a clay-based water blocking material 1A is laid down to a predetermined thickness, and a housing 20 of a disposal facility is placed thereon. The casing 20 is formed, for example, in a cylindrical shape, and a large number of harmful wastes 21 such as radioactive wastes and industrial wastes are enclosed therein. The laying range of the clay-based waterstop material 1A at the bottom is a portion immediately below the housing 20, and the thickness thereof is set to a thickness that sufficiently exhibits the water-stop performance provided by the clay-based waterstop material 1A itself. . And between 1 C of clay-based waterproofing materials and the side wall G1 of the underground ground G, the block integrated body 2 similar to 1st Embodiment is embed | buried at the substantially same height as 1A of clay-based waterproofing materials. . This block assembly 2 is constructed in an annular shape so as to surround the bottom of the housing 20.
[0013]
Between the outer wall of the housing 20 of the disposal facility and the underground ground G, a clay water-stopping material 1B is filled, and a hole to the surface of the earth is filled with the clay water-stopping material 1C. These clay-based waterstop materials 1B and 1C are the same material as the clay-based waterstop material 1A. The thickness of the clay water-stopping material 1B at the side wall portion is set to a thickness at which the water-stopping performance of the clay water-stopping material 1B itself is sufficiently exhibited. The depth of the clay-based water-stopping material 1C in the covering portion up to the ground surface is set to be several times to a dozen times as large as that of the bottom and the side wall G1, but it is about the same as the clay-type water-stopping material 1A and the side wall G1 at the bottom Thickness may be used.
[0014]
(3) Third Embodiment FIG. 4 shows an underground burying structure of a disposal facility according to a third embodiment of the present invention. The housing 30 of the disposal facility that encloses the waste 21 has a long rectangular parallelepiped shape extending in the front and back directions of the drawing, and the housing 30 is embedded in the tunnel-shaped excavation hole G2. The housing 30 is placed on the clay-based water-stopping material 1A laid on the underground ground G. Between the clay-based water-stopping material 1A and the side wall G1 of the underground ground G, first and second A block assembly 2 similar to that of the embodiment is embedded at substantially the same height as the clay-based waterstop material 1A. The block assembly 2 is embedded in a band shape along the bottoms on both sides of the housing 30 and is also embedded between the clay-based waterstop material 1A and the side wall G1 at both ends of the housing 30. (That is, the block assembly 2 is constructed in a rectangular frame shape so as to surround the bottom of the housing 30.)
[0015]
As in the second embodiment, the clay water-stopping material 1B is filled between the outer wall of the housing 30 of the disposal facility and the underground ground G, and the hole to the ground surface is filled with the clay water-stopping material 1C. ing. The thickness of the clay-based water blocking material 1B at the side wall G1 and the depth of the clay-based water blocking material 1C at the covered portion up to the ground surface are also set as in the second embodiment.
[0016]
According to the second and third embodiments, similarly to the first embodiment, the plastic deformation flow and the viscous flow of the clay-based waterstop material 1A laid immediately below the housing 20 (30) are accumulated in blocks. Since it is restrained by the body 2, the supporting force of the housing 20 (30) and the water stop performance of the clay water stop material 1A are ensured stably over a long period of time. As a result, the waste 21 can be reliably and safely isolated over a long period of time.
[0017]
【The invention's effect】
As described above, according to the present invention, a viscous flow suppressing body that suppresses plastic deformation flow and viscous flow of the clay-based waterstop material is embedded around the clay-type waterstop material that supports the frame. , It has an effect that the support force of the housing is ensured stably over a long period of time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a building support structure according to a first embodiment of the present invention.
2 is a perspective cross-sectional view showing a block integrated body (viscous flow suppressing body) used in the building support structure shown in FIG. 1; FIG.
FIG. 3 is a cross-sectional view showing an underground burying structure of a disposal facility according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view showing an underground burying structure of a disposal facility according to a third embodiment of the present invention.
FIG. 5 is a sectional view showing a conventional building support structure.
FIG. 6 is a cross-sectional view showing a defect state of a conventional building support structure.
FIG. 7 is a cross-sectional view showing the underground structure of a conventional disposal facility.
[Explanation of symbols]
1A: Clay-based waterstop material 2 ... Block assembly (viscous flow suppression body)
2a ... Block 2b ... Non-permeable material 10, 20, 30 ... Housing G ... Underground ground

Claims (2)

A structure that supports the structural frame on a clay-based waterstop laid at the bottom of the underground ground,
The clay-based water-stopping material is laid in a portion immediately below the housing, and a plastic deformation flow of the clay-based water-stopping material is formed in a lateral space formed between the clay-based water-stopping material and the side wall of the underground ground. And a viscous support body that suppresses viscous flow is filled and embedded so as to surround the bottom portion of the casing, and the structure is supported by a clay-based waterstop material.   2. The clay system according to claim 1, wherein the viscous flow suppressing body is a block aggregate in which a hardly water-permeable material is filled or sandwiched in a space between a plurality of blocks having a low water permeability and high rigidity. Housing support structure with water-stop material.

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