JP7280603B2 - Collapse prevention structure - Google Patents

Description

The present invention relates to a building collapse prevention structure.

BACKGROUND ART Conventionally, as a structure for preventing a building from collapsing, a structure in which a box-shaped body is stacked between the foundation and beams of the building is known.
In this structure, when a column of a building is damaged, the axial force of the pillar is taken over by the stacked box-shaped bodies, and each layer of the stacked box-shaped bodies deforms in order, preventing rapid floor collapse. .

JP 2013-122159 A

In recent years, there have been many cases of damage caused by earthquakes, and there have been cases in which people inside the building were saved when the floors of the building collapsed by securing a space for survival by hanging walls and spandrel walls.
Conventional collapse-prevention structures for buildings prevent total collapse by preventing sudden collapse of floors. If it ends up, there is a risk that the survival space will not be secured in the end.

An object of the present invention is to provide a collapse-preventing structure (collapse-preventing structure) for a building that suppresses rapid floor collapse and secures a survival space when the floor collapses.

The collapse prevention structure of the present invention, which has been made to achieve the above object, comprises a pedestal, a plurality of box-shaped bodies stacked in parallel on the upper part of the pedestal, and between the lowest box-shaped body and the pedestal. and a support plate to be arranged, the box-shaped body is a hollow cube with an open front surface and a rear surface, and the pedestal is configured by arranging and standing a plurality of pedestal pipes made of steel pipes, and adjoining the The surfaces of the box-shaped bodies that contact each other are integrally connected, and they are arranged near the pillars of the building and between the beam and the foundation. The body is characterized in that it is not connected to the beam .
The pedestal pipe has a columnar body filled with a material having a Young's modulus lower than that of the pedestal pipe and hardened. The upper surface of the columnar body is located at a position lower than the upper end of the base pipe by a predetermined height, and the length of the support leg is from the upper surface of the columnar body to the upper end of the base pipe. It is characterized by being longer than it is tall.

The present invention can obtain at least one of the following effects by the means for solving the above problems.
(1) Since the stacked box-shaped bodies are deformed in order for each layer, rapid floor collapse is suppressed.
(2) Since the columnar body to which the compressive force through the pedestal pipe acts is constrained in the circumferential direction by the pedestal pipe, the confining effect is exhibited, and the yield strength and toughness of the columnar body are improved.
(3) When a load acts on the column through the support leg, the column compresses and deforms, absorbing the impact acting on the support plate and suppressing excessive impact on the pedestal pipe.
(4) Since the pedestal is made of steel pipe, it does not deform even if it receives the weight of the building or the load caused by the collapse of the floor.

The perspective view of the collapse prevention structure of this invention Perspective view of box-shaped body Perspective view of support plate (1) Perspective view of support plate (2) Explanatory drawing of arrangement state of the collapse prevention structure of the present invention Explanatory drawing of box-shaped body deformation (1) Explanatory drawing of box-shaped body deformation (2) Explanatory diagram of columnar deformation Explanatory drawing of a state in which survival space is secured by the pedestal Explanatory drawing of a pedestal according to another embodiment

Hereinafter, the collapse prevention structure of the present invention will be described in detail with reference to the drawings.

[Example 1]
(1) Collapse Prevention Structure The collapse prevention structure of the present invention is constructed by arranging and stacking a plurality of box-shaped bodies 1 on top of a pedestal 2 (FIG. 1).
A columnar body 3 is arranged inside the hollow pedestal 2 .
In addition, a support plate 4 is arranged in the lower part of the box-shaped body 1 in the lowest stage, and a support leg 5 is protruded from the lower surface of the support plate 4 .

(2) Box-shaped Body The box-shaped body 1 is a hollow cube with open front and back sides, and is made of steel plates (Fig. 2).
The box-shaped body 1 is provided with bolt insertion holes 11 at corresponding positions on each surface.
The box-shaped bodies 1 are arranged in parallel and stacked, and the bolts of the connecting members 12 made up of bolts and nuts are inserted into the bolt insertion holes 11 on the surfaces in contact with each other, and the nuts are screwed together to connect them.

(3) Pedestal The pedestal 2 is formed by arranging a plurality of pedestal pipes 21 made of steel pipes and standing upright.
The interior of the base tube 21 is filled with the columnar body 3 .
The columnar body 3 is formed by filling the interior of the pedestal pipe 21 with a material having a Young's modulus lower than that of the pedestal pipe 21, such as foamed concrete, and hardening the material.

(4) Support Plate The support plate 4 is a plate-like body arranged between the box-like body 1 and the pedestal 2 .
The support plate 4 has connecting bolts 41 projecting from its upper surface (FIG. 3).
The connection bolt 41 is protruded at a position corresponding to the bolt insertion hole 11 of the box-shaped body 1, is inserted through the bolt insertion hole 11, and is tightened with a nut 42 to fix the box-shaped body 1 to the upper surface of the support plate 4. .
The support leg 5 projecting from the lower part of the support plate 4 has a cross-sectional shape that can be inserted into the pedestal pipe 21, and is inserted into the pedestal pipe 21 from its upper end.
The columnar body 3 to be filled in the pedestal pipe 21 does not fill up to the upper end of the pedestal pipe 21, and the upper surface is a position lowered by a predetermined height. The lower end of the support leg 5 is supported by the upper surface of the columnar body 3 .
The length of the supporting leg 5 is made longer than the height from the upper surface of the columnar body 3 to the upper end of the base tube 21. - 特許庁
With this configuration, the support plate 4 and the base tube 21 are not in contact with each other when the support leg 5 is supported by the columnar body 3 .
The support plate 4 may be arranged over the upper ends of the plurality of pedestal tubes 21 arranged side by side ( FIG. 3 ), or one plate-shaped body may be arranged for each pedestal tube 21 and each support leg 5 . A plate-like body may be arranged (FIG. 4). At this time, one support plate 4 is made larger than the inner diameter of the base tube 21 .

(5) Arrangement of Collapse Prevention Structure The collapse prevention structure of the present invention is arranged in the vicinity of the column 6 and between the beam 7 and the base portion 8 (FIG. 5).
The lower end of the pedestal 2 is fixed to the base portion 8, but the upper end of the box-shaped body 1 and the beam 7 are not connected. With this configuration, even if the beam 7 and the base portion 8 are displaced relative to each other, no shearing force acts on the collapse prevention structure and deformation due to the shearing force does not occur.

(6) Action of Collapse Prevention Structure (6.1) Action of Box-shaped Body When the column 6 collapses, the collapse prevention structure of the present invention supports the axial force instead of the column 6 . Since the collapsing prevention structure does not deform due to shear force, the effect of axial force support is always exhibited.
When the axial force received increases, each layer of the stacked box-shaped bodies 1 deforms and absorbs the impact (FIGS. 6 and 7).
Since the stacked box-shaped bodies 1 are deformed in order for each layer at the stage leading to floor collapse, rapid floor collapse is suppressed.

(6.2) Action of columnar body In the collapse prevention structure of the present invention, the lower end of the support leg 5 is supported by the upper surface of the columnar body 3. Therefore, the load applied from the box-shaped body 1 to the support plate 4 is It acts on the columnar body 3 through (FIG. 8(a)).
Since the support leg 5 is housed inside the pedestal tube 21 and the support plate 4 and the pedestal tube 21 are not in contact with each other, the impact force acting on the support plate 4 is not directly transmitted to the pedestal tube 21, and the impact force acting on the support plate 4 is not directly transmitted to the pedestal tube 21. Since the side pressure is transmitted to the pedestal pipe 21 via the columnar body 3, the pedestal pipe 21 does not buckle.
Since the pedestal pipe 21 is filled with the columnar body 3, even if the compressive force due to the impact force continues to act, the columnar body 3 does not collapse unlike bare foamed concrete, and maintains its shape while maintaining distortion. In addition, since the columnar body 3 to which the compressive force acts is constrained in the circumferential direction by the base tube 21, the confining effect is exhibited, and the yield strength and toughness of the columnar body 3 are improved.

Moreover, since the columnar body 3 has a low Young's modulus, it is compressed and deformed when the load is increased (FIG. 8(b)).
The upper surface of the columnar body 3 is a position that is lowered by a predetermined height from the upper end of the base tube 21 . Since the length of the support leg 5 is longer than the height from the upper surface of the columnar body 3 to the upper end of the pedestal pipe 21, the lower surface of the support plate 4 and the upper end of the pedestal pipe 21 are separated by a predetermined distance. Therefore, when a load acts on the columnar body 3 via the support leg 5, the columnar body 3 is compressed and deformed by this distance.
Since the columnar body 3 is compressed and deformed, it absorbs the impact force applied to the support plate 4 and suppresses the application of excessive impact force to the base pipe 21 .
When the columnar body 3 is compressed and deformed and the lower portion of the support plate 4 contacts the upper end of the pedestal pipe 21 , the load acting on the support plate 4 is supported by the pedestal pipe 21 .

(6.3) Action of Pedestal When the floor collapses, the box-shaped body 1 suppresses the sudden collapse of the floor, so that no excessive load acts on the pedestal 2 .
Since the pedestal 2 is made of a steel pipe, it does not deform even if it receives the weight of the building or the load caused by the collapse of the floor, and a survival space S is secured when the floor collapses (Fig. 9).

[Other Examples]
(1) Pedestal structure The pedestal 2 in Example 1 has the pedestal pipes 21 arranged adjacently and filled with the columnar bodies 3 inside. The pedestal pipes 21 may be arranged at predetermined intervals (FIG. 10(a)), or the support plate 4 may be directly supported by the pedestal pipes 21 without filling the interior with the columnar bodies 3 ( FIG. 10(b)). At this time, the support plate 4 may have a configuration in which the support legs 5 do not protrude.

1 box-shaped body 11 bolt insertion hole 12 connecting member 2 pedestal 21 pedestal pipe 3 column-shaped body 4 supporting plate 41 connecting bolt 42 nut 5 supporting leg 6 pillar 7 beam 8 base

Claims (2)

a pedestal;
a plurality of box-shaped bodies arranged in parallel and stacked on top of the pedestal;
a support plate arranged between the bottom box-shaped body and the pedestal;
The box-shaped body is a hollow cube with an open front surface and a rear surface,
The pedestal is configured by arranging and standing a plurality of pedestal pipes made of steel pipes,
The adjacent box-shaped bodies connect their contacting surfaces integrally ,
Placed near the pillars of the building and between the beam and the foundation,
The lower end of the pedestal is fixed to the base, and the uppermost box-shaped body is not connected to the beam ,
Collapse prevention structure. In the collapse prevention structure according to claim 1,
The pedestal pipe has a columnar body filled with a material having a Young's modulus lower than that of the pedestal pipe and hardened,
A support leg that can be inserted into the base pipe protrudes from the lower surface of the support plate,
the upper surface of the columnar body is located at a position lower than the upper end of the base pipe by a predetermined height;
The length of the support leg is longer than the height from the upper surface of the columnar body to the upper end of the base tube,
Collapse prevention structure.

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