JPH08113959A - Reinforcing structure of supporting ground of structure - Google Patents

Abstract

PURPOSE: To prevent the damage of a structure by mounting a cut-off wall surrounding the lower section of the structure into the ground, fixing a cut-off plate surrounding the lower section of the structure on a cut-off wall in a liquid- tight manner, and installing a sealing material between the structure and the cut-off plate. CONSTITUTION: A structure 12 consisting of a tank is constructed on a banking 24 installed on the ground 14. A cut-off wall 16 composed of solidified column piles, etc., made of soil cement is set up into the ground 14 so as to surround the lower section of the structure 12. A cut-off plate 18 made up of concrete, etc., is mounted so as to surround the lower section of the structure 12 while being fixed onto the cut-off wall 16 in a liquid-tight manner. A flexible sealing material 20 such as an asphalt material is fitted between the structure 12 and the cut-off plate 18. A section between the ground 14 and the cut-off plate 18 is filled with fillers 22 such as foam concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting ground for a structure, and more particularly to a reinforcing structure for a supporting ground such as a sandy ground which is likely to be liquefied due to shock or vibration during an earthquake.

[0002]

2. Description of the Related Art Conventionally, in order to reinforce a supporting ground of a structure that is easily liquefied, a cylindrical water blocking wall extending downwardly from the ground below the structure, and the water blocking structure on which the structure is placed. A reinforcing structure composed of a water blocking plate connected to a wall has been proposed (JP-A-2-213522).

According to this, the supporting ground under the structure is restrained inside the water blocking wall and the water blocking plate, and therefore, shear deformation and volume change of the supporting ground during an earthquake occur. It is suppressed and liquefaction of the supporting ground is prevented. Further, even if the supporting ground is liquefied due to a large-scale earthquake, there is no movement of earth and sand between the supporting ground and the surrounding ground, and therefore the supporting ground The volume of the ground does not change, and the subsidence of the structure and the resulting damage to the structure are prevented.

[0004]

By the way, the water blocking plate supports the structure on the water blocking plate, and the construction must be performed before the construction of the structure. Therefore, the conventional reinforcing structure has a drawback in that it cannot be applied to a structure already constructed, that is, a supporting ground under an existing structure. An object of the present invention is to provide a ground reinforcement structure that can be applied to both the support ground of newly constructed structures and existing structures.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a reinforcing structure for a supporting ground of a structure, which is a tubular water blocking wall surrounding a lower portion of the structure and extending downward in the ground, and the water blocking. A water blocking plate that is liquid-tightly fixed to a wall and surrounds the lower portion of the structure, and a flexible seal material provided between the structure and the water blocking plate, or the ground and the water blocking plate. And a filler filled between the plate and the plate. Further, the depth of the water blocking wall is set so that the lower end thereof reaches the non-sandy soil layer.

[0006]

According to the present invention, the tubular water blocking wall and the water blocking plate restrain the ground (supporting ground) under the structure,
The shear deformation and the volume change of the supporting ground at the time of an earthquake are suppressed, and thereby the liquefaction of the supporting ground is prevented.
Even if the supporting ground is liquefied due to a large-scale earthquake, the movement of the sediment and water of the supporting ground is restricted to the space between the supporting ground and the water stop plate. .
From this, the volume change of the support ground and the subsidence of the structure on the support ground accompanying this can be minimized, and damage to the structure can be prevented. The sealing material between the water blocking plate and the structure prevents the liquefied fluidized sand and water in the supporting ground from being jetted into the atmosphere, and the flexibility of the water blocking plate and the Mutual destruction of the water blocking plate and the structure based on the phase difference of both vibrations of the structure and their strength difference is prevented.

Further, by filling a space between the ground and the water blocking plate with a filler, the flow of earth and sand and water outside the support ground when the support ground is liquefied and the support ground accompanying it It is possible to prevent the volume change of the structure, and thereby prevent the subsidence of the structure on the support ground and the accompanying damage of the structure.

Further, according to the present invention, since the water blocking plate for closing the open upper portion of the cylindrical water blocking wall extending downward in the ground is provided not around the lower portion of the structure but around the lower portion thereof.
Whether the structure is newly built on the supporting ground or already built on the supporting ground, the structure does not hinder the construction of the water blocking plate.
From this, the reinforcing structure according to the present invention can be applied to both the support ground of new structures and existing structures.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a reinforcing structure for a structure supporting ground according to the present invention is shown generally by the reference numeral 10.

The reinforcing structure 10 is a tubular water blocking wall 16 that surrounds the lower portion of the structure 12 and extends downward in the ground 14.
And a water blocking plate 18 that is liquid-tightly fixed to the water blocking wall 16 and surrounds the lower portion of the structure 12, and a flexible sealing material 20 and ground provided between the structure 12 and the water blocking plate 18. 14
And at least one of the fillers 22 filled between the water blocking plate 18 and the water blocking plate 18.

The structure 12 is composed of a tank having a circular cross-sectional shape in the illustrated example, and is constructed on the embankment 24 provided on the ground 14. The structure 12 and its foundation are not limited to the tank and the embankment. For example, in the case of a structure consisting of a building, the building is constructed on a solid foundation (not shown), for example. Therefore, the foundation of the structure is surrounded by the upper part of the water blocking wall 16 extending upward from the ground surface.

The water blocking wall 16 is composed of a solid column pile made of soil cement, a sheet pile, an impermeable sheet, etc., and has a circular or polygonal cross-sectional shape. Since the foundation of the structure is poor in water blocking performance, it is not appropriate to set the height position of the upper end of the water blocking wall 16 and the installation position of the water blocking plate 18 fixed thereto to be the periphery of the foundation of the structure. .

The water blocking wall 16 and the water blocking plate 18 are the ground surrounded by them, that is, the supporting ground 2 below the structure 12.
4 is restrained inside thereof to suppress shear deformation and volume change of the support ground 24 during an earthquake. This prevents liquefaction of the support ground 24 when the ground 14 is composed of improved ground or sandy ground that is easily liquefied during an earthquake.

The water blocking plate 18 is made of concrete, steel plate, plastic material or the like, has the same outer shape as the cross-sectional shape of the water blocking wall 16, and cooperates with the sealing material 20 to form the water blocking wall 16.
The open top on the ground is closed. Further, the sealing material 20 filling the gap between the inner peripheral surface of the water blocking plate 18 and the outer peripheral surface of the structure 12 is an asphalt material, a rubber material, or
It is made of a plastic material such as a silicone sealant and has an annular or cylindrical shape.

Generally, pore water and soil particles in the liquefied ground move upward. The supporting ground 24 is liquefied when a large seismic force exceeding the restraining ability of the supporting ground 24 by the water blocking wall 16 and the water blocking plate 18 acts,
Water stop wall 16 and water stop plate 1 having the ability to prevent the passage of water
8 and the sealing material 20 limit the movement of the liquefied support ground 24 to the soil and water in the space 28 between the support ground 24 and the water stop plate 18. From this, the volume change of the support ground 24 and the subsidence of the structure 12 on the support ground 24 due to this change are minimized, and the structure 12 is prevented from being destroyed. The embankment, a concrete block, etc. (not shown) are installed on the water stop plate 18 and a vertical load is applied to the water stop plate 18, whereby the restraining force to the support ground 24 can be increased.

By making the sealing material 20 flexible, the phase difference of vibration between the water blocking plate 18 and the structure 12 at the time of an earthquake and both of the water blocking plate 18 and the structure 12 It is possible to mitigate the impact caused by the collision between the two based on the strength difference and prevent damage to at least one of them.

Further, the liquefied support ground 24 and the water stop plate 1
When the space 28 between 8 and 8 is filled with the filling material 22, there is no place for the liquefied supporting ground 24 to reach the soil and water, and therefore, the volume of the supporting ground 24 does not change, and the structure Subsidence of 12 is prevented.

If the space 22 is filled with the filling material 22 and the sealing material 20 is arranged, if the filling material 22 is cracked during an earthquake, the earth and sand and the water will be ejected to the atmosphere through the cracks. Can be prevented.

As the filler 22, for example, foam concrete or mortar material can be used. Further, both the space 28 and the gap between the water blocking plate 18 and the structure 12 may be filled with the same material such as an asphalt material instead of a separate material.

The tubular water blocking wall 16 extending in the ground is preferably set to have a depth dimension such that the lower end thereof reaches the impermeable or poorly permeable ground layer 30 such as a clay layer. As a result, the ability to prevent the flow of earth and sand from the liquefied supporting ground 24 to the surrounding ground 26 can be further increased.

According to the present invention, the water blocking wall 16 and the water blocking plate 18 constituting the reinforcing structure 10, particularly the water blocking plate 18, can be constructed after the structure 12 is constructed on the ground.
Therefore, it is possible to reinforce the support ground of the structure 12 regardless of whether the structure 12 is a newly constructed structure or an existing structure that is previously constructed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a reinforcing structure for a supporting ground of a structure.

FIG. 2 is a plan view of the reinforcing structure shown in FIG.

[Explanation of symbols]

 10 Reinforcement Structure 12 Structure 16 Water Stop Wall 18 Water Stop Plate 20 Sealing Material 22 Filling Material

Claims (4)

[Claims] 1. A reinforcing structure for supporting ground of a structure, comprising:
A cylindrical water blocking wall surrounding the lower part of the structure and extending downward in the ground, a water blocking plate liquid-tightly fixed to the water blocking wall and surrounding the lower part of the structure, the structure and the stop Including a flexible sealing material provided between the water plate,
Ground reinforcement structure. 2. A reinforcing structure for supporting ground of a structure, comprising:
A tubular water stop wall that surrounds the lower part of the structure and extends downward in the ground, a water stop plate that is liquid-tightly fixed to the water stop wall and that surrounds the lower part of the structure, the ground and the water stop A reinforcing structure for the ground, including a filling material filled between the plate and the plate. 3. The ground reinforcement structure according to claim 1, further comprising a filler filled between the ground and the water blocking plate. 4. The ground reinforcement structure according to claim 2, further comprising a flexible seal member provided between the structure and the water stop plate.