JP2011099282A - Foundation structure of building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent differential settlement and a deterioration in earthquake-resistance strength by achieving a sufficient bearing strength even in soft ground, in a foundation structure with a foamed resin base. <P>SOLUTION: This foundation structure of the building includes: the foamed resin base 5A; a foundation structure base 9 which is formed on the foamed resin base 5A; and an outer peripheral supporting structure portion 8 which supports the foundation structure base 9 and which is arranged on the outer peripheral side of the foamed resin base 5A. Characteristically, in the outer peripheral supporting structure portion 8, a lower ground contact surface 6a is formed on a convex cylindrical surface shape with an axis line 6x along the outer periphery of the foamed resin base 5A; an upper portion has a supporting surface 7a; and the supporting surface 7a supports the bottom 9d of the foundation structure base 9 from below. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a foundation structure of a building, and more particularly to a foundation structure suitable for forming on a soft ground.

  Conventionally, as a countermeasure for ground subsidence in soft ground or the like, as shown in FIG. 10 or FIG. 11, a building having a foamed resin base 55A made of a foamed resin block and a base structure base 59 made of concrete or the like thereon. A basic structure has been proposed. For example, in the following Patent Document 1, a base structure in which a connecting body (not shown) having an air layer is interposed between the foamed resin base 55A and the base structure base 59 is used. Further, in this basic structure, as shown in FIG. 10, the side surface foamed resin board 62 is brought into contact with all or a part of the side surface of the foamed resin base 55A, and thereby the vibration transmitted to the building from the lateral direction and the obliquely downward direction. The effect of waves can be reduced.

  Further, in the basic structure using the foamed resin base as described above, as shown in FIG. 11, the outer periphery of the foamed resin base such as a structure in which a deep outer periphery underground beam 59a is formed on the outer peripheral side of the foamed resin base 55A. A base structure in which a part of the base structure base 59 is adjacent to the side is known (see Patent Documents 2 to 5 below). The basic structure shown in FIGS. 10 and 11 is not the above prior art itself, but is provided with a leveling surface 51, a civil engineering sheet 52, gravel 53, a dry mortar 54, and a backfill layer 61 so as to correspond to the embodiments described later. It is a comparative example.

  On the other hand, the following Patent Document 6 discloses a basic structure in which a discarded frame having a substantially U-shaped cross section is arranged at the peripheral edge. Further, in Patent Document 7 below, a load is radially distributed by providing a skirt-like building support leg with an arc-shaped cross section at the contact portion with the inner ground at the outer peripheral end. An earthquake-resistant foundation structure that prevents uneven settlement by preventing it is disclosed.

Japanese Patent Laid-Open No. 10-346578 Japanese Patent Laid-Open No. 9-273160 Japanese Patent Laid-Open No. 2001-131988 JP 2001-59228 A No. 8-3463 JP 2001-32293 A JP 2002-309592 A

  However, in the basic structure using the conventional foamed resin base, the foamed resin base is deformed into a rhombus shape due to a horizontal stress received during an earthquake or the like, and the base resin material of the foamed resin base has a stress exceeding the proof stress. If applied, permanent strain may remain, which may significantly reduce the basic strength of the building. From this point of view, the effect of the side portion foamed resin board 62 is insufficient, and the side face foamed resin board 62 is lifted when subjected to a large horizontal stress or after a long period of time. It may be exposed on the ground surface.

In addition, when the earth bearing capacity is sufficient (for example, 50 kN / m ² or more), the ground reaction force distribution is larger in the vicinity of the center of the building and becomes smaller toward the periphery as shown in FIG. However, in the case of soft ground with low ground strength (for example, 30 kN / m ² or less), as shown in FIG. 9, the distribution of ground reaction force is the largest at the outer periphery of the building and goes toward the center of the building. There is a tendency to become smaller. Therefore, in soft ground, the load on the outer periphery of the foundation structure of the building is the largest, so when vertical stress is applied to the outer periphery of the foundation structure during an earthquake, etc., stress is applied to the ground supporting the outer periphery. Concentration may cause uneven settlement, and the seismic strength may be substantially reduced. In particular, if a deep outer underground beam is formed on the outer periphery of the foamed resin base as described above, the weight of the outer peripheral portion increases and the load further concentrates on the outer peripheral portion. There is a risk of becoming more serious.

  Furthermore, in the basic structure using the foamed resin base, when the solvent for the foamed resin such as petroleum flows to the ground surface around the building, the solvent penetrates into the surrounding ground (particularly in the backfill layer 61) and foams. It has been pointed out that the resin base 55A may be dissolved and a part of the base structure may be lost.

  Therefore, the present invention solves the above-mentioned problems, and the problem is that the foundation structure having the foamed resin base realizes sufficient support strength even in soft ground, thereby reducing the uneven settlement and seismic strength. It is to prevent.

  In view of such circumstances, the basic structure of the building of the present invention includes a foamed resin base, a base structural base formed on the foamed resin base, an outer peripheral side of the foamed resin base while supporting the base structural base. An outer peripheral support structure portion disposed on the outer peripheral support structure portion, wherein the outer peripheral support structure portion is formed in a convex cylindrical surface shape in which a lower grounding surface has an axis along the outer periphery of the foamed resin base And having a support surface at the top, the support surface supports the bottom of the foundation structure base from below.

  According to this invention, the lower grounding surface is formed in a convex cylindrical surface and the outer peripheral support structure portion having the support surface on the upper side is provided on the outer peripheral side of the foamed resin base, and the foundation is supported by the support surface of the outer peripheral support structure portion. By adopting a structure that supports the bottom of the structure base from below, the substantial ground contact area of the outer periphery of the base structure is increased by the convex cylindrical surface of the contact surface having an axis along the outer periphery of the foam resin base. Since concentration of load can be prevented, even in soft ground, it is possible to prevent uneven settlement due to the outer peripheral portion where load is concentrated. In addition, since the base structure base and the outer peripheral support structure for supporting the base structure base from below are disposed outside the foam resin base, excessive deformation of the foam base is disposed even when a horizontal stress is applied. While being able to stop, it can also prevent that a solvent penetrate | invades from the outer peripheral side and dissolves a foamed resin base | substrate.

  In one aspect of the present invention, the outer peripheral support structure portion includes a semi-cylindrical frame member and a filler disposed inside the frame member, and the outer surface of the frame member defines the grounding surface. And the upper surface of the filler constitutes the support surface. According to this, the outer peripheral support structure is constituted by a semi-cylindrical frame material and a filler disposed inside the frame material, and the support surface formed by the upper surface of the filler is the bottom of the foundation structure base Since the structure is supported from below, regardless of the filler, the frame structure can be used to maintain the shape of the outer peripheral support structure even when a load is received from the foundation structure. It is possible to secure the workability, and it is possible to easily perform the construction by using the frame material, and the construction cost can be reduced. In this case, by using a material having a specific gravity smaller than that of the foundation structure base as the filler, the outer peripheral support structure portion can be configured to be light. It is possible to adopt a configuration that does not diminish the advantages of using the base. Further, by using a material having a certain degree of fluidity and elasticity such as a granular material, a powdery material, and an elastic body as a filler, the base structure can be provided with a seismic isolation function.

  In this case, it is preferable that the frame material is disposed adjacent to the outside of the foamed resin substrate. According to this, since the outer peripheral portion of the foamed resin base and the frame material are adjacent, even if horizontal stress due to an earthquake or the like is applied, the deformation of the foamed resin base can be reduced by supporting it with the frame material, and the basic structure The generation of permanent set can be avoided. In this case, the foamed resin substrate and the frame member may be in close contact with each other, but they may be adjacent to each other with a certain distance. In this case, it is preferable that the distance is less than the deformation amount that does not exceed the yield strength of the foamed resin substrate in order to prevent permanent deformation of the foamed resin substrate.

  Moreover, it is preferable that the said grounding surface of the said frame material is provided with the ditch | groove or the protruding item | line. According to this, the ground contact area can be further increased, and the concave grooves or ridges can easily bite into the ground or the lower ground, so that the stability of the outer peripheral support structure portion against the horizontal displacement and posture change is enhanced. be able to. Further, the rigidity of the frame member itself can be increased by forming a concave groove or a convex shape on the ground surface. In particular, by forming the concave groove or convex shape so as to extend along a semi-cylindrical curved direction (direction around the axis), it is possible to suppress the positional deviation in the axial direction of the frame material and to follow the curved shape. It is possible to increase the direction bending rigidity. On the other hand, by forming the groove or convex so as to extend in the direction along the axial direction of the semi-cylindrical shape, positional deviation in the direction intersecting the axial direction of the frame member and rotation around the axis (posture change) While being able to prevent, the bending rigidity of an axial direction can be improved.

  In another aspect of the present invention, the bottom portion and the support surface are in a substantially flat and intimate state. According to this, since the support contact portion of the outer peripheral support structure portion and the foundation structure base is configured to be substantially flat, the posture of the support surface that is in close contact with the bottom portion is stabilized, so horizontal stress is applied. The change in posture of the outer peripheral support structure can be reduced.

  In another aspect of the present invention, the bottom portion of the foundation structure base is supported by the support surface in a range including a center portion in the width direction of the outer peripheral support structure portion. According to this, since the bottom part of the foundation structure base is supported by the support surface of the outer periphery support structure part in a range including the center part in the width direction of the outer periphery support structure part, the load received from the foundation structure base can be efficiently and balanced. Since the outer peripheral support structure can be burdened, the support stability of the foundation structure can be enhanced.

  In still another aspect of the present invention, the plurality of outer peripheral support structures are arranged adjacent to each other in the width direction, and the bottom portion of the foundation structure base is supported across the plurality of outer periphery support structures. According to this, a plurality of outer peripheral support structure portions are arranged adjacent to each other in the width direction, and the foundation structure base is supported by the plurality of outer peripheral support structure portions, so that the ground contact area is increased without increasing the ground dug depth. As a result, the load burden can be more easily distributed.

  According to the present invention, by providing an outer peripheral support structure portion having a convex cylindrical surface-shaped ground surface along the outer periphery of the foamed resin base, it is possible to suppress the increase in the weight of the base structure, and even in a soft ground having a small ground strength. Since it can be set as the foundation structure straddling on an outer peripheral part, the outstanding effect that a seismic strength can fully be ensured can be produced, preventing an uneven settlement.

The fragmentary sectional view which shows the outer peripheral part of the basic structure of 1st Embodiment which concerns on this invention. The fragmentary sectional view which shows the outer peripheral part of the basic structure of 2nd Embodiment which concerns on this invention. The schematic plan view which shows the basic structure of 1st Embodiment. The perspective view of a frame material. Explanatory drawing which shows typically the support structure of the outer periphery support structure part in 1st Embodiment. Explanatory drawing which shows typically the support structure of the outer periphery support structure part in 2nd Embodiment. Explanatory drawing which shows typically the support structure of the outer periphery support structure part in 3rd Embodiment. The distribution map which shows the tendency of a load and ground reaction force when the earth bearing capacity is large. The distribution map which shows the tendency of a load and ground reaction force when a ground bearing capacity is small. The fragmentary sectional view which shows the comparative example of foundation structure. The fragmentary sectional view which shows the other comparative example of foundation structure. The perspective view which shows the example of a different frame material.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Initially, the basic structure of 1st Embodiment is demonstrated with reference to FIG.1, FIG.3, FIG.4 and FIG. FIG. 1 is a partial sectional view showing an outer peripheral portion of the foundation structure of the first embodiment, FIG. 3 is a schematic plan view of the foundation structure of the first embodiment, and FIG. 4 is a diagram of a frame material used for the foundation structure of the first embodiment. A perspective view and FIG. 5 are explanatory views schematically showing the support structure of the first embodiment.

  The foundation structure of this embodiment has the structure shown in FIG. 1, and the structure is demonstrated below with the method of constructing the foundation structure. First, the ground is cut (excavated) to form the leveling ground 1, and the civil engineering sheet 2 is laid on the leveling ground 1. It is preferable that the civil engineering sheet 2 is excellent in gravel holding power, such as a braided nylon or polypropylene fiber. The civil engineering sheet 2 is preferably waterproof, but may be water permeable, such as one formed in the shape of a mesh as long as it does not pass through the following gravel 3. . In addition, you may form the groove | channel 1a in the area | region which arrange | positions the outer periphery support structure part 8 mentioned later around the leveling ground 1 as needed. The groove 1a is formed in order to secure the accommodation height of the outer peripheral support structure portion 8. When the height of the outer peripheral support structure portion is small, it is not necessary to form the groove 1a.

  A gravel 3 is laid on the civil engineering sheet 2 and a dry mortar 4 is further laid thereon to ensure flatness and surface level by rolling or the like. The gravel 3 is preferably crushed stone, and the dry mortar (empty kneaded mortar) 4 is a powdery and granular binder substantially free of water. For example, a mixture of sand and cement may be used. preferable.

  Next, the foamed resin block 5 is spread on the dry mortar 4. As the foamed resin block 5, a block body in which foamed polystyrene, foamed polypropylene, foamed polyethylene or the like is molded into a predetermined shape can be used. In terms of low specific gravity, expanded polystyrene is most preferred. Moreover, as long as specific gravity is small, you may be comprised with what mixed and hardened foamed resin and concrete (foamed resin concrete). The foamed resin block 5 preferably has a long-term sufficient support strength.

  In the present embodiment, the foamed resin substrate 5A is configured by laying a plurality of foamed resin blocks 5. At this time, the adjacent foamed resin blocks 5 are bonded and fixed to each other with an adhesive (for example, urethane-based adhesive). However, the foamed resin base 5A may be integrally formed as a foamed resin concrete base as described above, or may be configured by molding one foamed resin block. Here, in order to increase the rigidity of the foamed resin substrate 5A, unlike the illustrated example, it is preferable that the foamed resin substrate 5A is laid in a single layer. On the other hand, when the foamed resin block 5 is laid in a state where a plurality of foamed resin blocks 5 are laminated as shown in the figure, it is desirable that the lower and upper foamed resin blocks 5 are also bonded and fixed with the adhesive. In this way, the plurality of foamed resin blocks 5 are bonded and fixed to each other, so that the foamed resin blocks 5 spread on the leveling surface 1 are integrated, the surface accuracy of the support surface is improved, and the subsequent workability is also improved. To do.

  In addition, when laminating a plurality of foamed resin blocks 5 over two or more layers as shown in the illustrated example, the laminated structure of the foamed resin blocks 5 includes the position of the adhesive fixing portion on the lower layer of the foamed resin block 6, and The position of the immediately upper layer adhesive fixing portion (that is, the positions of the adhesive fixing portions adjacent in the vertical direction) is shifted in the plane direction. That is, it is preferable that the foaming resin block 5 is laminated by various bricks. If it does in this way, since the integrity of a plurality of resin blocks 5 can be raised, the rigidity of foamed resin base 5A can be raised.

A semi-cylindrical frame member 6 is arranged on the outer periphery of the foamed resin substrate 5A in a posture with the convex cylindrical surface contact surface 6a facing downward. The frame member 6 can be made of a hard resin material such as reinforced plastic, a hard rubber material, a composite material of metal and resin, or the like. Moreover, it is preferable to have rigidity (the rate of change of the radius of curvature is, for example, 10% or less) capable of maintaining a schematic shape under a pressure of, for example, 3 to 10 kN / m ² received from the bottom 9d described below, and under the above pressure It is preferable that the material has elasticity.

  As shown in FIG. 4, the frame member 6 is formed in a semi-cylindrical shape having an axis 6x. In the illustrated frame member 6, the axis 6x is a straight line. However, when the outer periphery of the foamed resin substrate 5A is curved and refracted, the axis 6x may be curved and refracted along the outer periphery. . The ground contact surface 6a provided at the lower part of the frame member 6 is basically a cylindrical surface convex downward. Here, the terms semi-cylindrical and cylindrical surface need not be strictly a semi-cylindrical shape or a cylindrical surface, and irregularities may be formed in the details, and the cross-sectional shape may be an ellipse or an ellipse. In other words, the shape may be a shape corresponding to the above, as long as it has a convex-curved cross section downward when viewed as a whole.

  In the case of the illustrated example, the frame wall of the frame member 6 is formed in a waveform in the direction of the axis 6x, and thereby the ground surface 6a is formed with a groove 6b and a ridge 6c extending in a bending direction around the axis 6x. By forming the frame wall of the frame member 6 in a corrugated shape, the rigidity of the frame member 6 is improved as a whole, and in particular, the bending rigidity in the direction of maintaining the curved shape is increased. In addition, the formation of the concave grooves 6b and the ridges 6c on the ground surface 6a increases the biting of the lower layer and the surrounding lower layer ground (in this embodiment, crushed stone or gravel), and the posture stability of the outer peripheral support structure 8 is improved. improves. In particular, since the concave grooves 6b and the ridges 6c extend in the bending direction, displacement of the outer peripheral support structure portion 8 in the axis 6x direction is prevented. In the illustrated example, the groove 6b and the ridge 6c extend in the bending direction. However, like the frame member 6 'shown in FIG. 12, the groove 6b' or the ridge 6c 'has an axis 6x on the ground surface 6a'. It may be formed to extend in the ′ direction. In this case, the flexural rigidity in the direction of the axis 6x ′ of the frame member 6 ′ is increased, and the displacement of the outer peripheral support structure 8 in the direction orthogonal to the axis 6x ′ and the rotation around the axis 6x ′ are prevented.

  The semi-cylindrical frame members 6 and 6 'may be formed by halving a commercially available pipe (for example, a resin pipe for underground burial), or a commercially available half used for drainage or the like. The split pipe may be used as it is. Thus, the frame members 6 and 6 ′ of the present embodiment can be obtained easily and inexpensively because they are semicylindrical. The ground surface 6a of the frame member 6 may be formed as a smooth cylindrical surface without forming the above-mentioned concave grooves and ridges.

  The frame material 6 contains a filler 7 made of crushed stone, various slag materials, sand, mortar, foamed resin, other soft resin materials, hard resin materials, or the like. The filler 7 is desirably a material having a specific gravity smaller than that of the surrounding ground in order to reduce the weight of the foundation structure. Further, as will be described later, a material having a certain degree of elasticity (hard resin material, particularly an elastic body such as hard rubber) or a material having a certain degree of fluidity such as a granular material or a powdery material (sand And so-called coarse aggregate and light aggregate such as fine aggregate). The frame member 6 and the filler 7 constitute the outer peripheral support structure portion 8 and are installed at the outer peripheral position corresponding to the groove 1a. The outer peripheral support structure 8 is basically disposed along the outer peripheral edge of the building. However, in general, as shown in FIG. 3, the foundation beam 9a is formed not only on the outer peripheral edge of the building but also on the inner side. Therefore, the outer peripheral support structure 8 is arranged on the inner side of the building so as to correspond to the foundation beam 9a. You may install in. However, even in this case, the outer peripheral support structure 8 is disposed on the outer peripheral side of the foamed resin base 5A.

  In the present embodiment, the dry mortar 4 is further laid on the gravel 3 and the regenerated slag as the filler 7, and a flat support surface 7a is formed by rolling or the like. The support surface 7a supports a bottom surface 9d configured as a flat surface of a foundation beam 9a constituting an outer peripheral portion of the foundation structure base 9 described later from below. Although the material which comprises the filler 7 is not specifically limited, When using for a soft ground, it is preferable when suppressing the increase in load that the filler 7 is a thing with a specific gravity smaller than the surrounding ground. Moreover, by using a granular material, powder, or an elastic body as the filler 7 as described above, it is possible to increase the impact absorbability at the time of an earthquake and reduce the damage to the building. In the present embodiment, the frame material 6 can be used for easy construction even when the filler 7 is a granular material or powder, and the outer shape of the outer peripheral support structure 8 (particularly the ground contact surface 6a) even when subjected to an external force. Therefore, the stability of the foundation structure itself can be ensured.

  Further, as shown in FIG. 3, the outer peripheral support structure portion 8 composed of the semi-cylindrical frame member 6 and the filler 7 has an axis 6x (semi-cylindrical axis) direction extending along the outer periphery of the foamed resin substrate 5A. It is installed in the existing posture. That is, the arcuate grounding surface 6a is arranged such that the bending direction intersects the direction along the outer periphery in a plan view. By doing in this way, the frame material 6 can be installed along the outer periphery of the region where the foamed resin base 5A is to be disposed, and the frame material 6 can be filled with the filler 7 easily and quickly. The radius of curvature of the ground contact surface 6a of the outer periphery support structure 8 (frame member 6) or the width measured along the horizontal plane is determined according to the load of the building applied to the outer periphery of the foamed resin substrate 5A. For example, the width is generally a value within a range of 300 to 1500 mm. When the radius of curvature or the width is increased, the position of the ground contact surface 6a of the outer peripheral support structure portion 8 is disposed below the foamed resin substrate 5A. Therefore, it is preferable to form the groove 1a.

  In addition, it is preferable that gravel 3 such as crushed stone is disposed in the lower layer of the frame member 6 as in the illustrated example. Since the lower ground made of granular material such as gravel 3 can be matched to the shape of the grounding surface 6a of the frame member 6, the grounding property of the grounding surface 6a can be secured, so the outer peripheral support structure 8 is installed in a stable state. it can. In particular, it is desirable to configure the lower layer ground (surrounding ground) in contact with the ground contact surface 6a with a homogeneous material (preferably a lightweight aggregate that does not pass through the civil engineering sheet). As a result, the load can be evenly distributed along the convex curved section of the ground surface 6a. Also, as a construction procedure, a frame material 6 is installed after a part of the gravel 3 is laid, and then the recycled slag or gravel 3 is put into the frame material 6 and the remaining gravel 3 is placed outside the frame material 6. By arranging the dry mortar 4 at the inside and outside of the frame member 6 at the end, the outer peripheral support structure 8 and the lower layer ground of the foamed resin base 5A inside thereof can be constructed in parallel.

  Further, in the case of the present embodiment, as shown in FIG. 3, a defective portion 5Ax where the foamed resin block 5 is not arranged is formed in an island shape at the center of the formation region of the foamed resin base 5A surrounded by the foundation beam 9a described later. Keep it. The formation portion of the defect portion 5Ax is a portion in which the central portion of the foamed resin block 5 is likely to rise due to the ground reaction force. By providing the defect portion 5Ax, the foundation structure base 9 described later forms the entire basic structure. The flatness can be ensured and the rigidity can be increased. In general, since the foundation beam 9a is formed not only on the outer peripheral portion of the building but also on the inner side, as shown in FIG. 3, a plurality of the above-mentioned regions to be surrounded by the foundation beam 9a are configured. In this case, the defect portion 5Ax may be formed at the center of the region. However, the defect portion 5Ax does not have to be formed in a region that is considered to be less influenced by reverse heaving, which will be described later, because the area of the region is small.

  Next, a mold frame (not shown) is formed on the foamed resin base 5 </ b> A composed of the foamed resin block 5 and the peripheral support structure 8 around it, and a reinforcing bar is stretched in the mold frame. And the foundation structure base 9 is formed by pouring concrete into this formwork.

  In the illustrated example, the upper foundation structure base 9 includes a foundation beam 9a formed on the outer peripheral support structure portion 8, a slab 9b formed on the foamed resin block 5, and the above-described defect portion 5x at the center of the slab 9b. And an island-shaped central filling portion 9c (indicated by a dotted line in FIG. 3) directly facing the lower layer (dry mortar 4) of the foamed resin block 5 therein. For example, a foundation of a building is installed on the foundation structure base 9 configured as described above, and a main body structure of the building is constructed on the foundation. At this time, a bottom surface 9d, which is a flat surface at the lower end of the foundation beam 9a, is closely (fixed) to the support surface 7a.

  When the foundation structure base 9 is formed as described above, the periphery thereof is backfilled with a backfill layer 11 such as gravel such as crushed stone. The backfill layer 11 is preferably made of a material having a specific gravity greater than that of the surrounding soil. In the case of this embodiment, the civil engineering sheet 2 is laid so as to extend from the rooted portion to the periphery, and the outer edge of the civil engineering sheet 2 is covered with the backfill layer 11. However, the outer edge of the civil engineering sheet 2 may be exposed to the ground surface, or may be fixed to some construction object installed on the ground surface. In any case, since the civil engineering sheet 2 is disposed under the backfill layer 11, outflow and movement of the backfill layer 11 can be reduced.

  In this embodiment, since the civil engineering sheet 2, gravel 3 and dry mortar 4 are sequentially laid on the leveling surface 1 and the foamed resin block 5 is laid on the civil sheet, the outflow and movement of the lower layer of the foamed resin block 5 are prevented. This can prevent the building from sinking or tilting. In particular, the civil engineering sheet 2 prevents the gravel 3 and the dry mortar 4 from flowing out and moving, and even if some water oozes out by the dry mortar 4, the upper layer of the gravel 3 is hardened to suppress changes in the ground. This makes it possible to reliably support the building even on extremely soft ground.

  Further, since the foamed resin blocks 5 are firmly fixed to each other as described above, and the adhesive fixing portions are laminated so as to be displaced in a plane, the foamed resin block 5A as a whole is integrated. As a result, it is possible to prevent the inclination of the building even if some ground changes occur.

  Furthermore, since the base structure base 9 is provided with an island-shaped center filling portion 9c at the center of the slab 9b, it is caused by ground reaction force based on the weight of the center filling portion 9c and the rigidity improvement of the slab 9b. Since the effect of suppressing the rise of the slab 9b is exerted, the deformation, settlement, inclination, etc. of the building can be further reduced. In particular, since the center filling portion 9c is configured in an island shape, the center filling portion 9c effectively acts on the rising of the slab 9b, and the center filling portion 9c does not need to be formed in a wide range like the foundation beam 9a. Therefore, there is an advantage that only a slight increase in weight is required.

  In addition, since the backfill layer 11 having a specific gravity larger than that of the surrounding soil is formed around the foundation structure base 9, reverse heaving (a phenomenon in which the surrounding soil is pushed up by the weight of the building) is performed. Since it can suppress, the settlement and inclination of a building can be suppressed further. In addition, the backfill layer 11 functions as a drainage channel when a quick sand phenomenon (salted sand phenomenon) occurs during a large earthquake. In particular, the drainage function can be enhanced by forming the backfill layer 11 using gravel such as crushed stone.

  According to the present embodiment, by supporting the bottom portion 9d of the foundation beam 9a of the foundation structure base 9 from below by the support surface 7a of the outer peripheral support structure portion 8 made of the frame material 6 and the filler 7, Since it is not necessary to form the foundation beam 9a deeply, it is possible to easily and quickly construct the foundation structure base 9, and avoid an increase in the weight of the foundation structure and concentration of loads on the outer peripheral portion. In addition, since the ground contact surface of the outer peripheral support structure 8 is formed in a convex cylindrical surface, the load applied to the ground of the outer peripheral portion can be dispersed (inward and outward directions) by increasing the ground contact area. Uneven settlement can be prevented. Furthermore, since the outer peripheral support structure 8 can absorb vibrations and stresses received from the outside depending on the elasticity of the frame member 6 having the convex cylindrical surface 6a and the degree of ease of deformation of the filler 7, It contributes to the improvement of seismic strength and can reduce damage to the building itself.

  FIG. 5 is an explanatory view schematically showing a support structure of the foundation structure base 9 by the outer peripheral support structure portion 8. In the present embodiment, the flat support surface 7a of the outer peripheral support structure portion 8 supports the flat bottom surface 9d of the outer peripheral portion (base beam 9a) of the foundation structure base 9 from below, but in the present invention, the support surface 7a. As long as the bottom portion 9d is supported by this, there is no limitation. Further, various configurations are conceivable as support modes of the flat bottom portion 9d with respect to the flat support surface 7a, but both surfaces are not necessarily smooth planes. For example, when the support surface 7a is formed of a surface on which crushed stone is laid, even if the surface of the crushed stone is flattened by rolling or the like, the boundary between the support surface 7a and the bottom portion 9d in close contact with the surface is flat if viewed strictly. is not. However, when viewed from the entire support range by the support surface 7a of the bottom portion 9d, and from the viewpoint of the following effects of improving the posture stability of the outer peripheral support structure portion 8, a substantially flat support surface is obtained. It can be regarded as composed.

  As described above, in the present embodiment, the flat support surface 7a of the outer peripheral support structure portion 8 supports the flat bottom surface 9d of the foundation beam 9a of the foundation structure base 9 from below, so that both the flat surfaces are in close contact with each other. As a result, the stability of the support structure of the foundation structure base 9 and the outer peripheral support structure portion 8 can be increased, so that the rigidity of the foundation structure against the stress applied to the side of the foundation structure base 9 can be increased.

  In FIG. 5, as in the case shown in FIG. 1, the bottom portion 9 d of the foundation structure base 9 is supported by the support surface 7 a in a range including the center portion Wc in the width direction of the outer peripheral support structure portion 8. More specifically, the outer peripheral portion of the foundation structure base 9 includes the width direction central portion Wc of the outer peripheral support structure portion 8 except for a part on the outer side in the width direction, and the support surface 7a in the support range S reaching the inner edge. Is supported by In other words, in the present embodiment, the support range S is set to a range including the center position Wc. Here, in the central portion Wc in the width direction, when the formation range of the convex cylindrical surface contact surface 6a is the full width W, a bisector (shown by a one-dot chain line in the drawing) of the full width W intersects the support surface 7a. Say the position (midpoint).

  As described above, in the present embodiment, the foundation structure base 9 is supported by the outer peripheral support structure 8 in the support range S including the center portion Wc in the width direction of the outer peripheral support structure 8 as shown in FIG. The posture stability of the outer peripheral support structure 8 provided with the cylindrical ground contact surface 6a can be enhanced.

  Further, in the present embodiment, the outer edge of the foamed resin substrate 5A is laterally adjacent to (in close contact with) the outer peripheral support structure 8, so that the outer edge of the foamed resin substrate 5A is supported on the foundation structure substrate 9 from the outside. Similarly to the case, it is possible to suppress the deformation of the rhombus shape of the foamed resin substrate 5A caused by the horizontal stress due to an earthquake or the like, thereby preventing permanent deformation from occurring in the foundation structure.

  Moreover, in this embodiment, since the filler 7 in the frame material 6 has the same structure as the lower layer ground (the gravel 3 and the dry mortar 4) of the foamed resin base 5A, there is an advantage that the construction is easy. That is, after the civil engineering sheet 2 is developed on the leveling surface 1 as necessary, the frame material 6 is first installed and then the lower ground and the filler 7 are formed in parallel, thereby greatly increasing the work. It can be simplified. However, in order to ensure the grounding property of the ground contact surface 6a of the outer peripheral support structure 8, it is necessary to previously lay granular materials such as sand and gravel 3 under the ground contact surface 6a of the frame member 6 as shown in FIG. preferable.

  Furthermore, in this embodiment, even if a solvent such as petroleum flows out around the base structure base 9 and penetrates into the backfill layer 11, the foamed resin base 5A on the inner side is present due to the presence of the outer peripheral support structure 8. Can be prevented from dissolving. In this case, when the frame member 6 or the filler 7 itself of the outer peripheral support structure 8 is formed of a resin material or the like that is not resistant to a solvent, as shown by a dotted line in FIG. Etc. (for example, the oil adsorption and decomposing agent SNOMMAT, SNOMWIDE (both are trade names) manufactured by Ascenty Co., Ltd.) on the ground surface of the outer periphery of the foundation structure base 9 or in the ground as shown in the figure It is preferable to form.

  Next, the basic structure of the second embodiment according to the present invention will be described with reference to FIG. In this embodiment, the civil engineering sheet 12, gravel 13, dry mortar 14, foamed resin block 15 (foamed resin base 15A), frame material 16, filler 17, outer peripheral support structure 18 and base structure base 19 are each of the first structure. Since the same material as that described in the embodiment can be used and construction can be performed in the same manner, these descriptions are omitted.

  In the case of this embodiment, the foundation beam 19a of the foundation structure base 19 is disposed adjacent to (or in close contact with) the side of the foam resin base 15A so that the foam resin base 15A is deformed in the horizontal direction. Can be suppressed by the foundation beam 19a. Further, the outer peripheral support structure 18 is disposed below the foamed resin base 15A, and supports the bottom 19d of the base beam 19a from below. In the case of the illustrated example, the upper surface (support surface 17a) of the outer peripheral support structure 18 coincides with the surface of the lower layer ground (the gravel 3 and the dry mortar 4) of the foamed resin base 5A. Even in the structure of this embodiment, if necessary, a groove 1a is formed in a part of the leveling surface 1 so as to correspond to a planned portion where the foundation beam of the foundation structure is formed, and the outer peripheral support structure is formed by the groove 1a. The housing height of the portion 18 may be ensured.

  In this embodiment, the deformation of the foamed resin base 15A is suppressed by the base beam 19a of the foundation structure base 19 being adjacently disposed on the side of the foamed resin base 15A. Therefore, although the depth of the ground digging is slightly deeper than in the first embodiment, the effect of preventing deformation of the foamed resin substrate 15A against horizontal stress due to an earthquake or the like can be enhanced. Further, in the present embodiment, since the filler 17 made of gravel and dry mortar having the same configuration as the lower layer ground of the foamed resin base 15A is accommodated in the frame material 16 of the outer peripheral support structure portion 18, the first embodiment. There is an advantage that construction becomes easy as well. However, in the present embodiment, the surface of the lower layer ground (the gravel 13 and the dry mortar 14) of the foamed resin base 15A is disposed at the same height as the support surface 17a of the outer peripheral support structure portion 18; The formation of the lower layer ground is further facilitated, and the foamed resin base 15A and the foundation structural base 9 can be easily formed.

  Also in the present embodiment, the (flat) bottom portion 19d of the foundation beam 19a is supported by the (flat) support surface 17a formed by the surface of the filler 17 at the top of the outer peripheral support structure portion 18. . As for the planar structure, as shown in FIG. 3, the axis of the outer peripheral support structure 18 is installed in a posture extending along the outer periphery of the foamed resin substrate 15 </ b> A. Moreover, the support structure by the outer periphery support structure part 18 with respect to the foundation structure base 19 is comprised as shown in FIG. 6, and becomes a structure supported in the range S including the width direction center part Wc of an outer periphery support structure part similarly to the above. ing. Therefore, the operational effects corresponding to these configurations are the same as in the first embodiment.

  The support structure shown in FIG. 6 is the same as that of the first embodiment in that the outer peripheral portion of the foundation structure base 9 is supported by the support surface 7a in the range S including the center portion Wc in the width direction of the outer peripheral support structure portion 8. However, in this case, a range that does not support the outer peripheral portion of the foundation structure base 9 is provided on the outer side in the width direction and the inner side in the width direction of the support range S in the entire width W of the outer peripheral support structure portion 8. If comprised in this way, since the bottom part of the foundation beam 9a is supported only by the filler 7, the filler 7 is comprised with the material (hard resin material etc.) which has elasticity, and the material (sand, crushed stone, etc.) which has fluidity | liquidity. If this is done, the foundation structure base 9 will have a certain degree of mobility, and it will be possible to further reduce the damage to the building by obtaining shock absorption during an earthquake. Can do.

  Next, the support structure of the third embodiment will be described with reference to FIG. In the third embodiment, the shapes and positional relationships of the foamed resin base 25A and the base structure base 29 can be configured in the same manner as in either the first embodiment or the second embodiment. However, the illustrated example shows an example formed based on the configuration of the second embodiment.

  In the present embodiment, in order to support the outer peripheral portion of the foundation structure base 29, a plurality (two in the illustrated example) of the outer periphery support structure portions 28 and 28 are each in an attitude having an axis along the outer periphery of the foamed resin base 25A. It is installed adjacent to the width direction. The support surfaces 27 a of the plurality of outer peripheral support structures 28 support the bottom 29 d of the foundation beam 29 a of the foundation structure base 29. That is, the foundation structure base 29 is supported so as to straddle a plurality of outer peripheral support structures 28 adjacent in the width direction.

  As in the present embodiment, the plurality of outer peripheral support structures 28 arranged adjacent to each other in the width direction support the foundation structure base 29 from below, so that the load can be sufficiently dispersed without increasing the digging depth. Can do. In the illustrated example, two outer peripheral support structures are used in the width direction, but this is merely an example, and three or more outer peripheral support structures may be arranged, depending on the magnitude of the load and the state of the ground. Thus, the number of arrangements of the outer peripheral support structures can be arbitrarily set.

  In any of the embodiments described above, the effect of preventing uneven settlement and inclination of the building as described above is extremely high, so even if the ground is soft, the depth of root cutting can be reduced, or the foamed resin block It is possible to reduce the amount used. Therefore, it is possible to reduce the construction cost and shorten the construction period as a whole.

  It should be noted that the basic structure of the present invention is not limited to the illustrated examples described above, and it is needless to say that various modifications can be made without departing from the scope of the present invention. For example, in each of the above embodiments, the outer peripheral support structure portion in which the filler is accommodated in the frame member is used. For example, the entire outer peripheral support structure portion having the ground contact surface and the support surface similar to those described above is simply used. You may integrally form with one raw material, for example, the same foamed resin material as the said foamed resin block.

DESCRIPTION OF SYMBOLS 1 ... Ground preparation, 2 ... Civil engineering sheet, 3 ... Gravel, 4 ... Dry mortar, 5 ... Foam resin block, 5A ... Foam resin base, 6 ... Frame material, 6a ... Grounding surface, 7 ... Filler, 7a ... Support surface , 8 ... outer peripheral support structure, 9 ... foundation structural base, 9a ... foundation beam, 9b ... slab, 9d ... bottom, 11 ... backfill layer

Claims (9)

A base structure comprising a foamed resin base, a base structure base formed on the foam base, and an outer peripheral support structure that supports the base base and is disposed on the outer peripheral side of the foam base. There,
The outer peripheral support structure is formed in a convex cylindrical surface with a lower grounding surface having an axis along the outer periphery of the foamed resin base and has a support surface on the upper part, and the support surface is the base structure base The basic structure of the building, which supports the bottom of the building from below.   The outer peripheral support structure includes a semi-cylindrical frame member and a filler disposed inside the frame member, and an outer surface of the frame member constitutes the grounding surface, and an upper surface of the filler Constituting the support surface, the building foundation of claim 1.   The building foundation structure according to claim 3, wherein the filler is a material having a specific gravity smaller than that of the foundation structure foundation.   The building basic structure according to claim 2, wherein the filler is made of a granular material, a powdery material, or an elastic body.   The building foundation structure according to any one of claims 2 to 4, wherein the frame member is disposed adjacent to the outside of the foamed resin substrate.   The foundation structure of a building according to any one of claims 2 to 5, wherein a concave groove or a ridge is provided on the ground contact surface of the frame member.   The building foundation structure according to any one of claims 1 to 6, wherein the bottom portion and the support surface are in a substantially flat and intimate state.   The building according to any one of claims 1 to 7, wherein the bottom portion of the foundation structure base is supported by the support surface in a range including a center portion in a width direction of the outer peripheral support structure portion. Foundation structure.   The plurality of outer peripheral support structures are arranged adjacent to each other in the width direction, and the bottom of the foundation structure base is supported across the plurality of outer peripheral support structures. The basic structure of the building described in the section.

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