JP2018003327A - Building foundation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building foundation capable of installing the building foundation and a large number of expansion members capable of largely lifting up, and capable of correcting a delicate inclination.SOLUTION: The present invention is formed as a building foundation in which an expansion member 20 expandable in the longitudinal direction by fluid injection is buried under a mat foundation 10 by vertical placement. Preferably, the expansion member 20 is provided with an outer cylinder 21 and a bag body 23 stored in the outer cylinder 21. Preferably, the expansion member 21 is also provided with an inner cylinder 22 arranged in the outer cylinder 21, the inner cylinder 22 is connected to an upper part of an expansion bag 23, and the inner cylinder 22 is movable in the longitudinal direction to the outer cylinder 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foundation of a building or the like.

  Patent Documents 1 and 2 disclose building foundations that can be restored horizontally when the building is tilted due to soft ground or an earthquake.

JP 2000-008398 A JP 2007-154525 A

  Patent Document 1 is a system in which a building is lifted up with a jack embedded under a solid foundation, but the cost is high and the machine is mechanical, so it is prone to failure. Patent Document 2 is a system in which a building is lifted up by expanding an embedded expanded steel pipe. However, since only the amount of cross-sectional deformation of the expanded steel pipe is lifted, it cannot be dealt with when the settlement / inclination is large. Moreover, since a long and slender expanded steel pipe is used horizontally, a large installation area is required, and it can be installed only at four corners of a building (see Patent Document 1 FIG. 1). Therefore, it may be difficult to correct the slight inclination, and it may not be possible to completely return to the horizontal.

  The present invention provides a building foundation characterized in that an extension member that can be extended in the longitudinal direction by fluid injection is embedded vertically under a solid foundation.

  In the present invention, since the extension member can be extended in the vertical direction, the lift-up amount can be increased. Therefore, even if the solid foundation is greatly inclined, it can be dealt with. In addition, since the extension member is placed vertically, a larger number of extension members can be installed, so that a slight inclination correction is possible.

1 shows a building foundation 1 according to an embodiment of the present invention. An exemplary structure of the extension member 20 is shown. The solid foundation 10 is shown in plan view. The usage example of the building foundation 1 is shown. The expansion member 20A in other embodiment is shown. The expansion member 20B of other embodiment is shown. A mode that the some cylindrical block 26 shifted | deviated is shown.

  FIG. 1 shows a building foundation 1 according to an embodiment of the present invention. 2 is a building. The building 2 is a house, a condominium, a building, or the like. The building foundation 1 includes a solid foundation 10 and a plurality of extending members 20 embedded under the solid foundation 10. A crushed stone layer 30, a support plate 31, or the like can be disposed at the lower end of the extension member 20 in order to prevent the extension member 20 from sinking. Instead, the cross-sectional area of the lower end of the extension member 20 (the outer cylinder 21 or the bag body 23) may be increased. If the ground beneath the extension member 20 is strong, these are not necessary. A crushed stone layer 32 may be provided under the solid foundation 10.

  The extension member 20 is a member having an elongated shape, and can be extended in the longitudinal direction by fluid injection. The elongate shape means that the dimension in the vertical direction (Z direction in FIG. 1) is larger than the dimension in the thickness direction (for example, diameter). The extension member 20 is buried vertically below the solid base 10. In other words, the longitudinal direction of the extension member 20 coincides with the longitudinal direction. Therefore, the extending member 20 can be extended in the vertical direction. The fluid is preferably air, but may be water.

  FIG. 2 shows an exemplary structure of the extension member 20. FIG. 2A is an enlarged structural view of the extension member 20, and FIG. 2B is a plan view of the extension member 20. The extension member 20 includes an outer cylinder 21, an inner cylinder 22 accommodated in the outer cylinder 21, and a bag body 23 accommodated in the inner cylinder 22.

  The outer cylinder 21 is a hollow cylindrical member. The outer cylinder 21 can be formed of plastic or metal. The outer cylinder 21 preferably has a large number of openings on the side surface. In that case, in order to prevent intrusion of earth and sand from the opening, it is preferable to provide a coating with a water-permeable material such as cloth on the outer periphery of the outer cylinder 21. Examples of the outer cylinder 21 having a large number of openings on the side include Japanese Patent No. 4025406, Japanese Patent Application No. 2005-201061, Japanese Patent Application No. 2004-138265, Japanese Patent Application No. 2003-170196, Japanese Patent Application No. 2001-212107, Japanese Patent Application No. 2001 -204189, Japanese Patent Application 2001-138619, Japanese Patent Application 2001-137260, Japanese Patent Application 2001-137199, Japanese Patent Application 2001-137145, Japanese Patent Application 2001-115158, Japanese Patent Application 2001-120453, Japanese Patent Application 2001- No. 064674, Japanese Patent Application No. 2000-352365, Japanese Patent Application No. 2000-325579, Japanese Patent Application No. 10-041263, Japanese Patent Application No. 10-020368, Japanese Patent Application No. 10-020379, etc. preferable.

  The inner cylinder 22 is a hollow cylindrical member. The inner cylinder 22 is slidable in the vertical direction with respect to the outer cylinder 21. The outer cylinder 21 can be formed of plastic or metal. A large number of openings may be provided on the side surface of the inner cylinder 22.

  The bag body 23 is formed of a flexible material that does not allow fluid to pass through. The bag body 23 can be preferably formed of a stretchable rubber tube or the like. The bag body 23 preferably has a bellows shape.

  The vicinity of the upper end of the bag body 23 is connected to the vicinity of the upper end of the inner cylinder 22 via a connecting member 22a. The connecting member 22a can be formed of, for example, a metal wire or a metal plate. A fluid inlet 23 a is provided at the upper end of the bag body 23.

  FIG. 3 shows the solid foundation 10 in plan view. As illustrated, a plurality of fluid inlets 23 a and filler inlets 11 are arranged in the vertical and horizontal directions of the solid foundation 10. The numbers and arrangement of the fluid inlets 23a and the filler inlets 11 in the figure are merely examples. The fluid inlet 23 a communicates with the bag body 23, and the filler inlet 11 communicates under the solid base 10.

  FIG. 4 shows an example of use of the building foundation 1. When the solid base 10 is tilted as shown in FIG. 4A due to soft ground or an earthquake, the bag body 23 is inflated by injecting fluid from the fluid inlet 23a. Since the bag body 23 and the inner cylinder 22 are connected by the connecting member 22a, the inner cylinder 22 rises with respect to the outer cylinder 21 as shown in FIG. The extension member 20 extends in the vertical direction. Thereby, the solid foundation 10 is lifted up. When the solid foundation 10 returns to the horizontal position, the filler 12 such as ready-mixed concrete is injected from the filler injection port 11 and solidifies, so that the horizontal of the solid foundation 10 is stabilized. When many openings are formed on the side surface of the outer cylinder 21, groundwater is taken into the outer cylinder 21 and the ground becomes strong.

  FIG. 5 shows an extension member 20A in another embodiment. 5A is a horizontal sectional view, FIG. 5B is a sectional view taken along line AA in FIG. 5A, and FIG. 5C is a sectional view taken along line BB in FIG. 5A. It is.

  The extension member 20A is different from the extension member 20 in that the outer cylinder 21 and the inner cylinder 22 are elliptical. The extension member 20A is embedded in the underground circular hole 24 provided by a drill or the like. The circular hole 24 has substantially the same diameter as the major axis of the outer cylinder 21. After embedding the extension member 20A, concrete 25 is filled into the circular hole 24, and the extension member 20A and the ground are reinforced. Since the groundwater is taken into the outer cylinder 21 from the portion where the concrete 25 is not present (see the arrow), the ground becomes strong like the extension member 20.

  FIG. 6 shows an extension member 20B according to another embodiment. Fig.6 (a) is a side view, FIG.6 (b) and FIG.6 (c) show AA sectional drawing of Fig.6 (a).

  The extending member 20B includes a plurality of cylindrical blocks 26 and a connecting sheet 27 that connects the cylindrical blocks 26 to each other. The cylindrical block 26 can be formed of plastic or metal. The connection sheet 27 can be formed of a flexible material such as cloth or rubber. The connecting sheet 27 is fixed to the cylindrical block 26 with an adhesive or a screw at a portion other than the bump 27a (see FIG. 6B). When fluid is injected into the bag body 23, the bag body 23 expands, the bump 27a extends, and the cylindrical blocks 26 are separated from each other, whereby the expansion member 20B expands in the vertical direction (FIG. 6B → FIG. 6). 6 (c)). A support bone 26 a may be provided inside the cylindrical block 26. As a result, as shown in FIG. 7A, the cylindrical block 26 does not collapse even if it is slightly displaced. FIG. 7B is a view of the two upper and lower cylindrical blocks 26 in a shifted state as viewed from above.

  The matters described in the above embodiment and the dimensions, shapes, arrangements, numbers, materials, etc. thereof, which are not described in the claims, are merely examples, and do not limit the claims. .

  The present invention can be used for a building foundation of any building including a house, a condominium, and an office building.

DESCRIPTION OF SYMBOLS 1 ... Building foundation 2 ... Building 10 ... Solid foundation 11 ... Filler inlet 12 ... Filler 20, 20A, 20B ... Extension member 21 ... Outer cylinder 22 ... Inner cylinder 22a ... connecting member 23 ... bag body 23a ... fluid inlet 24 ... circular hole 25 ... concrete 26 ... cylindrical block 26a ... support bone 27 ... Connecting sheet 30 ... crushed stone layer 31 ... support plate 32 ... crushed stone layer

Claims (7)

  A building foundation characterized in that an extension member that can be extended in the longitudinal direction by fluid injection is embedded vertically under a solid foundation.   The building foundation according to claim 1, wherein the extension member includes an outer cylinder and a bag body accommodated in the outer cylinder. The extension member further includes an inner cylinder disposed in the outer cylinder;
The inner cylinder is connected to the upper portion of the expansion bag,
The building foundation according to claim 2, wherein the inner cylinder is movable in a vertical direction with respect to the outer cylinder.   The building foundation according to claim 2 or 3, wherein the outer cylinder has a plurality of openings on an outer periphery.   The building foundation according to claim 1, wherein the extension member has a plurality of cylindrical blocks arranged above and below, and a connecting sheet that connects the upper and lower cylindrical blocks to each other.   The building foundation according to any one of claims 1 to 5, wherein the solid foundation has a fluid inlet for fluid injection. The building foundation according to any one of claims 1 to 6, wherein the solid foundation has a filler inlet for filling filler.