JP2008163613A - Building foundation and construction method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive building foundation rich in durability, which can suppress the liquefaction of ground under the building foundation by making vibrations hardly transmitted upon earthquakes, and a construction method for the building foundation. <P>SOLUTION: This building foundation comprises: a ditch hole 1 which is formed on a ground surface GL; a geogrid 2 which laid in the ditch hole 1; a replacement member 7 which is arranged in the ditch hole 1 on the geogrid 2; and a foundation body 8 which is arranged on the replacement member 7. Thus, a load of a building is evenly dispersed and transferred to the ground surface by the geogrid 2, so as to prevent differential settlement and enhance the bearing capacity of the soil of the ground. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a building foundation for a low-rise building and a building foundation construction method.

  Conventionally, for building foundations for low-rise buildings, considering the earthquake resistance at the time of earthquake occurrence, a continuous groove is formed on the ground surface, and a foundation material formed into a fixed shape by a foamed resin material is used. A foundation structure for a low-rise building has been proposed, characterized in that it is laid in a groove and the surface of the base material is formed by covering and laying with a concrete material by providing a bundle (see, for example, Patent Document 1). .

  As for the foundations for low-rise buildings, considering the earthquake resistance against pitching and rolling in the event of an earthquake, the foundation for buoyancy smaller than the density of the ground is located below the foundation of the building provided on the ground. In addition, a vibration isolation foundation structure in a building has been proposed in which a buffer region surrounding the periphery of the foundation is embedded (see, for example, Patent Document 2).

Furthermore, as a measure for ground subsidence and non-uniform subsidence measures related to building foundations for low-rise buildings, a structure in which a foundation for buoyancy smaller than the density of the ground is buried below the foundation of the building provided on the ground The buoyancy per unit area of the foundation over the entire bottom surface of the structure is a value obtained by subtracting the ground strength per unit area from the load per unit area of the building and the foundation. A foundation structure in a building that is characterized by being substantially equal has been proposed (see, for example, Patent Document 3).
Japanese Patent Laid-Open No. 9-273160 JP 2005-146611 A JP 2003-13460 A

  The above-described prior art is common in that a foamed resin material is used as a part of the ground material in order to improve earthquake resistance and the like when an earthquake occurs. As a result, it is certain that the damage to the building can be reduced to a certain extent in the event of an earthquake, but it was not possible to sufficiently prevent the ground beneath the building foundation from becoming liquefied. If the ground liquefies due to the shaking of the earthquake, even if there is little damage to the building itself, it will tilt as a whole building, and it will require a large amount of repair cost.

  In addition, the foamed resin material used as a part of the ground material is also an excellent ground material for replacement in terms of high shock absorption and low specific gravity, but the material cost is high. Therefore, it was necessary to reduce the amount of the foamed resin material used for the purpose of suppressing an increase in the construction cost of the building foundation.

  The present invention has been made in view of the above-described circumstances, and it is difficult to transmit vibration when an earthquake occurs, and it is possible to suppress liquefaction of the ground under the building foundation, and at a low cost, it is rich in durability. The purpose is to provide the building foundation method.

  Furthermore, an object of this invention is to provide the building foundation and building foundation construction method which suppressed the usage-amount of the foamed resin material, and suppressed the increase in construction cost.

  The invention of claim 1 includes a slot formed in the ground surface, a geogrid laid in the slot, a replacement member disposed in the slot on the geogrid, and on the replacement member And having a foundation body disposed.

  A second aspect of the present invention is the building foundation according to the first aspect, wherein the replacement member is a foamed resin material.

  The invention of claim 3 is the building foundation according to claim 1 or 2, wherein a permeable sheet is laid between the geogrid and the replacement member, and a permeable material is disposed on the permeable sheet. It has been done.

  According to a fourth aspect of the present invention, in the building foundation according to the second or third aspect, the replacement member includes a shielding member that shields a side portion and a bottom portion of the replacement member from the outside.

  According to a fifth aspect of the present invention, in the building foundation according to any one of the first to fourth aspects, a lateral vibration absorbing member is provided on a side surface of the foundation main body.

  The invention of claim 6 is the building foundation according to any one of claims 1 to 5, wherein the slot is formed on a bottom surface parallel to the ground surface and outward from an outer peripheral edge of the bottom surface. And a side portion provided so as to be inclined upward.

  The invention according to claim 7 is that after the ground surface is leveled to form a slot, a geogrid is laid in the slot, a replacement member is disposed on the slot from above the geogrid, and the replacement member It is to arrange the building foundation body on top.

  The invention of claim 8 is to provide a foamed resin material as the replacement member in the building foundation method of claim 7.

  The invention of claim 9 is the building foundation method according to claim 7 or 8, wherein a permeable sheet is laid between the geogrid and the replacement member, and a permeable material is disposed on the permeable sheet. That is.

  A tenth aspect of the present invention is the building foundation method according to the eighth or ninth aspect, wherein the side surface and the bottom surface of the replacement member are covered with a blocking member.

  According to the first aspect of the present invention, the load of the building is evenly distributed by the geogrid and transmitted to the ground, thereby preventing uneven settlement and improving the ground strength of the ground.

  According to invention of Claim 2, the weight added to a ground becomes light by replacing the soil of a groove hole with a foamed resin material, and the burden regarding a ground is reduced. In addition, during an earthquake, the foamed resin material absorbs and reflects vibrations, and the vibrations applied to the building can be attenuated. In other words, by combining the geogrid and foamed resin material, the building load is received by the geogrid and the load is evenly distributed and transmitted to the ground. And the cost for the foamed resin material can be greatly reduced. Furthermore, an impact that can be pushed up from directly below like a direct earthquake can be greatly attenuated by the cushioning effect of the replacement member.

  According to the invention of claim 3, by discharging the moisture in the slot, it is possible to prevent liquefaction during an earthquake and to remove moisture from the slot. Furthermore, it is possible to attenuate the vibration applied to the building by shaking the permeable material with traffic vibrations and vibrations during earthquakes.

  According to the invention of claim 4, by blocking the side part and the bottom part of the replacement member from the outside, the replacement member is prevented from attaching oil, chemicals, etc., and is caused by the adhesion of oil, chemicals, etc. Deterioration of the material in the replacement member can be prevented.

  According to invention of Claim 5, the vibration added to a building foundation from a horizontal direction can be attenuated.

  According to invention of Claim 6, the load of a building is distributed and transmitted not only to the bottom face of a slot but to a side face through a geogrid, and the burden concerning a ground can be reduced.

  According to the invention of claim 7, the load of the building is evenly distributed by the geogrid and transmitted to the ground to prevent the uneven settlement, and the ground strength of the ground is improved.

  According to invention of Claim 8, the weight added to a ground becomes light by replacing the soil of a slot with a foamed resin material, and the burden regarding a ground is reduced. In addition, during an earthquake, the foamed resin material absorbs and reflects vibrations, and the vibrations applied to the building can be attenuated. In other words, by combining the geogrid and foamed resin material, the building load is received by the geogrid and the load is evenly distributed and transmitted to the ground. And the cost for the foamed resin material can be greatly reduced. Furthermore, an impact that can be pushed up from directly below like a direct earthquake can be greatly attenuated by the cushioning effect of the replacement member.

  According to the ninth aspect of the present invention, by draining moisture from the slot, it is possible to prevent liquefaction during an earthquake and to remove moisture from the slot. Furthermore, it is possible to attenuate the vibration applied to the building by shaking the permeable material with traffic vibrations and vibrations during earthquakes.

  According to the invention of claim 10, by blocking the side part and the bottom part of the replacement member from the outside, the replacement member is prevented from adhering oil, chemicals, etc., and is caused by the adhesion of oil, chemicals, etc. Deterioration of the material in the second replacement member can be prevented.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

  FIG. 1 shows a first embodiment of a flow condition measuring apparatus according to the present invention, and an outline of a building foundation according to the present invention is shown in the figure.

  The building foundation according to the first embodiment of the present invention includes a slot 1 formed by digging down the ground surface GL, a geogrid 2 laid in the slot 1, and an overlay above the geogrid 2. A permeable sheet 3 laid, a permeable material 4 disposed on the permeable sheet 3, a civil engineering sheet 5 as a blocking member laid on the permeable material 4, and a sand body 6 provided in a thin layer on the civil engineering sheet 5; It has a laminated structure including a replacement member 7 laid on the sand body 6 and a foundation main body 8 made of concrete placed on the replacement member 7.

  Hereinafter, detailed description will be given of each of the above-described configurations.

  The slot 1 falls a predetermined distance from the ground surface GL, and gradually expands from the bottom surface portion 9 formed parallel to the ground surface GL and the outer edge portion of the bottom surface portion 9 toward the upper opening portion of the slot 1. And a side surface portion 10 formed to be inclined.

  The geogrid 2 is a sheet-like material having a regular lattice structure in which components having tensile resistance are connected. The geogrid 2 is made of a polymer material such as polyester and has both the bottom surface portion 9 and the side surface portion 10 of the slot 1. It is effective to have an area that can be covered sufficiently, a tensile strength in the longitudinal and lateral directions of about 40 kN / m, and an elongation in the longitudinal and lateral directions of 22% or less.

  The water permeable sheet 3 is a non-woven fabric having water permeability and having an area equivalent to that of the geogrid 2 and formed of a resin such as polypropylene, and has a thickness of 1.2 to 4.0 mm (test method JIS1908). In addition, those having a tensile strength in the transverse direction of 5.8 to 23.4 kN / m (test method JIS 1908) are effective.

  As the water permeable material 4, stone materials such as gravel or crushed stone are effective. The water permeable material 4 is filled up to the middle of the side surface portion 10 of the slot 1.

  The civil engineering sheet 5 is effective if it has an area larger than the area of the upper surface portion of the water permeable material 4 laid in the slot 1 and is formed of a resin such as polyester and has water permeability.

  For the replacement member 7, foamed resin materials such as foamed polystyrene, foamed polypropylene, and foamed polyethylene / polystyrene copolymer are effective. In particular, EPS (Expanded Poly-Styrol) is effective. This EPS includes an in-mold foaming method (EPS: Expanded Poly Styrol) and an extrusion foaming method (XPS: Extruded Poly Styrol) due to differences in production methods. In the present embodiment, both are collectively referred to as EPS. .

  The replacement member 7, the sand body 6, and the civil engineering sheet 5 wrap the sand body 6 from the lower side with the civil engineering sheet 5, and at the same time have a side surface and an upper surface of the replacement member 7 laid on the top of the sand body 6. A sandwich structure is employed in which a sand body 6 provided in a thin layer shape is sandwiched between the replacement member 7 and the civil engineering sheet 5.

  The replacement member 7 includes a concave edge 11 formed by horizontally dropping the outer edge of the upper surface of the replacement member 7 and a chamfered portion 12 formed at the boundary between the concave edge 11 and the upper surface. .

  Further, protective concrete 13 and leveled concrete 14 are respectively placed on the side surface and the concave edge 11 of the replacement member 7.

  Further, the upper surface of the replacement member 7 is formed with a recess 15 formed by dropping the central portion of the upper surface.

  Thereby, the replacement member 7 is covered with the civil engineering sheet 5 and the sand body 6 from the outside on the bottom surface, and the outer edges of the side surface and the top surface are covered with the protective concrete 13, the leveled concrete 14 and the civil engineering sheet 5, and further the upper surface is covered. The structure is covered with the base body 8 and covered in all directions.

  The foundation body 8 is made of concrete that is placed so as to be a solid foundation with respect to the upper surface of the replacement member 7, the concave edge 11, the chamfered portion 12 and the concave portion 15 of the replacement member 7 provided with the leveled concrete 14. And a bottom surface portion 17 that aligns with the concave and convex portions such as the concave edge 11, the chamfered portion 12, and the concave portion 15 of the replacement member 7.

  Further, a lateral impact absorbing member 18 is provided on the side surface of the base body 8. The lateral impact absorbing member 18 is made of foamed polypropylene (Expanded Poly-Propylene: EPP, hereinafter referred to as EPP) or foamed resin material such as EPS. Among them, EPP is effective in terms of impact absorption. .

  The construction procedure in the building foundation of the present embodiment having the above configuration is as follows. First, the ground surface GL is leveled to form the slot 1, and then the geogrid 2 is replaced with the bottom surface portion 9 and the side surface portion 10 of the slot 1. And lay so as to cover. Thereafter, the water permeable sheet 3 is laid over the geogrid 2.

  Next, the water-permeable material 4 is filled from the top of the water-permeable sheet 3 to the middle level of the side surface portion 10 of the slot 1, and after sufficiently rolling in four directions from above the water-permeable material 4 with a roller, the civil engineering sheet 5 Is laid on the top of the water-permeable material 4. Thereafter, the sand body 6 is disposed in a thin layer on the civil engineering sheet 5, and the replacement member 7 is disposed on the sand body 6.

  Subsequently, the outer edge of the civil engineering sheet 5 is folded inward, and the side surface of the replacement member 7 and the recess 15 are wrapped with the civil engineering sheet 5, and then the protective concrete 13 and the leveled concrete 14 are moved from the outer side of the civil engineering sheet 5 to the side surface of the replacement member 7. And, it is placed so as to cover the recess 15. Thereafter, the foundation body 8 is formed by placing concrete from above the replacement member 7 and the leveled concrete 14.

  And after arrange | positioning the horizontal direction impact-absorbing member 18 to the side surface of the foundation main body 8, finally, the clearance of the slot 1 is filled and the enforcement of a building foundation is completed.

  The vibration transmitted from the ground at the time of an earthquake, the vibration during construction or from the road is attenuated by shaking the crushed stone as the water permeable material 4, and the EPS as the replacement member 7 absorbs, reflects and attenuates the remaining vibration.

  In a direct earthquake, even when the phenomenon is pushed up from directly below the ground, the EPS as the replacement member 7 attenuates the shock pushed up from directly below by the cushion effect.

  Further, the lateral vibration transmitted from the ground is damped by the lateral shock absorbing member 18 provided on the side surface of the foundation body 8.

  Since the geogrid 2 has a lattice structure, it has excellent frictional characteristics. When the geogrid 2 is laid on the side surface and the bottom surface of the slot 1, the bottom surface portion 9 and the side surface portion 10 in the slot 1 are formed in the mesh of the geogrid 2. The gravel of the surface layer is fitted, and thereby the geogrid 2 and the bottom surface portion 9 and the side surface portion 10 of the slot 1 are mechanically engaged with each other. The side surface portion 10 is constrained and integrated with each other. In this case, the load from the building is transmitted uniformly through the geogrid 2 to the bottom surface portion 9 and the side surface portion 10 of the slot 1.

  Similarly, the contact location between the geogrid 2 and the water permeable sheet 3 and the contact location between the water permeable sheet 3 and the water permeable material 4 are also constrained and integrated by the interlocking effect described above.

  By providing the water permeable sheet 3, the soil layer of the groove 1 and the water permeable material 4 are separated to prevent mutual mixing of soil particles. Furthermore, the excess water of the water permeable material 4 is collected and drained. And while improving the intensity | strength of the slot 1 with the tensile strength and friction characteristic of the water-permeable sheet 3, the damage of the slot 1 and the geogrid 2 is prevented.

  The replacement member 7 in which the sand body 6 is disposed in a thin layer on the lower side is further covered with the civil engineering sheet 5 from the lower side of the sand body 6 to the bottom and side surfaces of the replacement member 7 and the outer edges of the upper surface. Prevent oil, chemicals, etc. from sticking to 7 This prevents the replacement member 7 under load from the building foundation from causing stress cracks (called chemical stress cracks or solvent cracks) due to adhesion of oil, chemicals, and the like.

  Further, the sand body 6 is disposed in a thin layer under the replacement member 7 and covered with the civil engineering sheet 5 having water permeability, so that excess water between the replacement member 7 and the civil engineering sheet 5 is provided by the sand body 6. The moisture is collected and drained to the outside of the civil engineering sheet 5. As a result, the replacement member 7 absorbs excess water and moisture, prevents moisture from being filled into the bubbles in the tissue of the foamed resin material serving as the replacement member 7, and prevents an increase in density in the replacement member 7. In this case, the impact absorbing property and the heat insulating property in the replacement member 7 are prevented from being lowered.

  By covering the side surface and the concave edge 11 of the upper surface of the replacement member 7 from the outside of the civil engineering sheet 5 with a protective member, the civil engineering sheet 5 Also has a function of pressing so as not to leave the replacement member 7.

  The foundation body 8 provided on the upper portion of the replacement member 7 is a so-called solid foundation in which the concrete is placed along the upper surface of the replacement member 7, so that the load of the building is transmitted to the water-permeable material 4. It is equally transmitted to the replacement member 7 and the geogrid 2.

  As described above, in the embodiment, corresponding to claim 1, the slot 1 formed in the ground surface GL, the geogrid 2 laid in the slot 1, and the groove on the geogrid 2 By having the replacement member 7 disposed in the hole 1 and the base body 8 disposed on the replacement member 7, the load of the building is evenly distributed by the geogrid 2 and transmitted to the ground. Prevent subsidence and improve the ground strength.

  Moreover, in the said Example, according to Claim 2, the said substitution member 7 was made into the foamed resin material, By replacing the soil of the slot 1 with the foamed resin material 7, the weight added to a ground becomes light, The burden on the ground is reduced. Further, at the time of an earthquake, the foamed resin material 7 absorbs and reflects the vibration, and the vibration applied to the building can be attenuated. That is, by combining the geogrid 2 and the foamed resin material 7, the load of the building is received by the geogrid 2, and the load is evenly distributed and transmitted to the ground. 7 can be reduced, and the cost of the foamed resin material 7 can be greatly reduced. Furthermore, an impact that can be pushed up from directly below like a direct earthquake can be greatly attenuated by the cushioning effect of the replacement member 7.

  Further, in the embodiment, corresponding to claim 3, a water permeable sheet 3 is laid between the geogrid 2 and the replacement member 7, and a water permeable material 4 is disposed on the water permeable sheet 3. Thus, by draining the moisture in the slot 1, it is possible to prevent liquefaction during an earthquake and to remove moisture from the slot 1. Furthermore, the vibration applied to the building can be attenuated by shaking the water permeable material 4 due to traffic vibrations and vibrations during earthquakes.

  Further, in the embodiment, corresponding to claim 4, the replacement member 7 includes a shielding member 5 that shields the side portion and the bottom portion of the replacement member 7 from the outside. Further, by blocking the bottom from the outside, it is possible to prevent oil, chemicals and the like from adhering to the replacement member 7, and it is possible to prevent deterioration of the material in the replacement member 7 caused by the adhesion of oil, chemicals and the like.

  Further, in the embodiment, corresponding to claim 5, the lateral vibration absorbing member 18 is provided on the side surface of the foundation body 7, so that the vibration applied to the building foundation from the lateral direction can be attenuated.

  Further, in the embodiment, corresponding to claim 6, the slot 1 is inclined upward and outward from the bottom surface portion 9 parallel to the ground surface GL and the outer peripheral edge portion of the bottom surface portion 9. By providing the side surface portion 10 provided in a distributed manner, the building load is distributed and transmitted through the geogrid 2 not only to the bottom surface of the slot 1 but also to the side surface, thereby reducing the load on the ground. it can.

  Further, in the embodiment, corresponding to claim 7, after the ground surface GL is leveled to form the groove hole 1, the geogrid 2 is laid in the groove hole 1, and the groove is formed from above the geogrid 2. By disposing the replacement member 7 in the hole 1 and disposing the building foundation main body 8 on the replacement member 7, the load of the building is evenly distributed by the geogrid 2 and transmitted to the ground to prevent uneven settlement. , Also improve the ground strength.

  Moreover, in the said Example, the weight added to a ground is lightened by replacing the soil of the slot 1 with the foamed resin material 7 by arrange | positioning the foamed resin material as the said replacement member 7 corresponding to Claim 8. The burden on the ground will be reduced. Further, at the time of an earthquake, the foamed resin material 7 absorbs and reflects the vibration, and the vibration applied to the building can be attenuated. That is, by combining the geogrid 2 and the foamed resin material 7, the load of the building is received by the geogrid 2, and the load is evenly distributed and transmitted to the ground. 7 can be reduced, and the cost of the foamed resin material 7 can be greatly reduced. Furthermore, an impact that can be pushed up from directly below like a direct earthquake can be greatly attenuated by the cushioning effect of the replacement member 7.

  Furthermore, in the said Example, by laying the water-permeable sheet 3 between the said geogrid 2 and the said substitution member 7, and arrange | positioning the water-permeable material 4 on the water-permeable sheet 3 corresponding to Claim 9. By discharging the moisture from the slot 1, it is possible to prevent liquefaction during an earthquake and to remove moisture from the slot 1. Furthermore, the vibration applied to the building can be attenuated by shaking the water permeable material 4 due to traffic vibrations and vibrations during earthquakes.

  Further, in the embodiment, corresponding to claim 10, by replacing the side and bottom of the replacement member 7 from the outside by covering the side surface and the bottom surface of the replacement member 7 with the blocking member 5, the replacement member 7 It is possible to prevent oil, chemicals and the like from adhering to 7, and to prevent deterioration of the material in the replacement member 7 caused by the adhesion of oil, chemicals and the like.

  FIG. 2 shows a second embodiment of the present invention. A building foundation according to the second embodiment of the present invention is a slot 1 formed by digging down the ground surface GL, and laid in the slot 1. The geogrid 2, the water permeable sheet 3 laid on top of the geogrid 2, the water permeable material 4 disposed on the water permeable sheet 3, and the replacement member 19 disposed on the water permeable material 4. It has a laminated structure having a foundation body 8 made of concrete placed on the replacement member 19.

  Hereinafter, the same reference numerals are given to the same portions as those in the first embodiment, and detailed description thereof will be omitted. In this example, a replacement member made of diverted soil or improved soil is used for the upper surface of the water-permeable material 4. 19 is filled. Here, diverted soil refers to in-situ diversion of construction generated soil, diversion of transportation and diversion of other remaining soil. Furthermore, improved soil is soil that has been improved from the remaining soil generated by construction and recycled so that it can be reused. Stabilization is performed using a stabilizing agent such as quicklime, blast furnace cement type B, or cement-based solidifying material. It means what was broken.

  A concave hole 20 that penetrates to the center portion of the bottom surface is formed in the center portion of the upper surface of the replacement member 19, and a chamfered portion 21 is formed on the outer edge of the top surface of the replacement member 19. Then, the leveled concrete 14 is placed on the periphery of the replacement member 19.

  The foundation body 8 is made of concrete that is placed so as to be a solid foundation with respect to the upper surface of the replacement member 19 and the leveled concrete 14, and an upper surface portion 16 that is horizontally formed so as to support the building, and the replacement member 19 And a bottom surface portion 17 that aligns with the concave and convex portions of the concave hole 20, the chamfered portion 21 and the like.

  The construction procedure in the building foundation of the present embodiment having the above configuration is as follows. First, the ground surface GL is leveled to form the slot 1, and then the geogrid 2 is replaced with the bottom surface portion 9 and the side surface portion 10 of the slot 1. And lay so as to cover. Thereafter, the water permeable sheet 3 is laid over the geogrid 2.

  Next, after filling the water-permeable material 4 from the top of the water-permeable sheet 3 to the middle level of the side surface of the slot 1, after sufficiently rolling the water-permeable material 4 in four directions from above the water-permeable material 4, Then, the replacement member 19 is filled.

  Subsequently, concrete is cast from above the replacement member 19 and the leveled concrete 14 to form the foundation body 8, and finally, the gap of the slot 1 is filled to complete the enforcement of the building foundation.

  As an effect on the present invention, the process steps for building foundations are greatly reduced, so that labor costs and other costs are reduced, and materials related to construction of building foundations are burdened with material costs such as foamed resin materials. By not using such a material, the material cost can be significantly reduced.

  The present embodiment has the same operations and effects as the first embodiment, corresponding to claims 1, 3, 6, 6, 7 and 9.

  In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the protective concrete and the leveled concrete may be integrated. Furthermore, although the foundation main body is a solid foundation in the embodiment, it may be a cloth foundation.

It is sectional drawing of the building foundation which shows 1st Example of this invention. It is sectional drawing of the building foundation which shows 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Groove hole 2 Geogrid 3 Water-permeable sheet 4 Water-permeable material 5 Civil engineering sheet (shielding member)
7,19 Replacement member 8 Base body 9 Bottom surface (slot)
10 Side (groove hole)
18 Lateral shock absorbing member GL Ground surface

Claims (10)

A slot formed in the ground surface, a geogrid laid in the slot, a replacement member disposed in the slot on the geogrid, and a base body disposed on the replacement member; Building foundation characterized by having The building foundation according to claim 1, wherein the replacement member is a foamed resin material. Between the geogrid and the replacement member, laying a water permeable sheet,
The building foundation according to claim 1 or 2, wherein a water-permeable material is disposed on the water-permeable sheet. The building foundation according to claim 2 or 3, wherein the replacement member includes a shielding member that shields a side portion and a bottom portion of the replacement member from the outside. The building foundation according to any one of claims 1 to 4, wherein a lateral vibration absorbing member is provided on a side surface of the foundation main body. 2. The slot according to claim 1, further comprising: a bottom surface parallel to the ground surface; and a side surface provided by inclining upward from an outer peripheral edge of the bottom surface. The building foundation according to any one of -5. After leveling the ground surface to form a slot, a geogrid is laid in the slot, a replacement member is disposed on the slot from above the geogrid, and a building foundation body is disposed on the replacement member. Building foundation construction method characterized by installation.   8. The building foundation method according to claim 7, wherein a foamed resin material is disposed as the replacement member. The building foundation method according to claim 7 or 8, wherein a water permeable sheet is laid between the geogrid and the replacement member, and a water permeable material is disposed on the water permeable sheet. The building foundation method according to claim 8 or 9, wherein a side surface and a bottom surface of the replacement member are covered with a blocking member.

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