JP2006045891A - Foundation structure for building and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep stability of a support pile body, even if earthquake vibration is generated, without imposing an excessive burden on the support pile body, and prevent or reduce deformation of a ground shape in the surface layer ground having no such support yield strength, in a pile foundation adopted in the ground having a surface layer without the support yield strength enough to support a load of a building. <P>SOLUTION: A pile foundation part composed of the support pile body 3 and a pile head 2 and a direct foundation part 4a are constructed, and a strain material 1a is arranged between the support pile 3 and the direct foundation 4a. Next, the building is constructed above its material. The strain material 1a is strained by the load of such a building, and the surrounding surface layer ground is also compressed together with this material, and the support yield strength is improved. The pile foundation part and the direct foundation part 4a are integrated by a joining part composed of a strain material 1b strained by a desired quantity, and a part of the building load can be supported with the direct foundation part 4a by the surface layer ground improved in the support yield strength. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a building foundation structure having a structure in which a pile foundation portion and a direct foundation portion are integrated by forming a joint, and a construction method thereof.

  In general, if the surface ground does not have sufficient bearing strength to support the load of the building, use a solid foundation such as a solid foundation or cloth foundation and use the load bearing capacity of the surface ground. Rather, it is necessary to support the load on a strong ground located below the surface ground. In such a case, a pile foundation having a pile head connected to the support pile body standing upright from the support layer and the upper part of the support pile body has been conventionally employed, with the solid ground as a support layer (for example, Non-patent document 1). According to the pile foundation, the load of the building is mainly supported by the support pile body and the support layer, so that the load of the building can be supported regardless of the soft ground located on the surface layer. Are better.

  Since the conventional pile foundation employs a structure in which almost all the load of the building is supported by the support pile body and the support layer as described above, the load on the support pile body is very large. Therefore, there is a problem that when a vibration is generated due to an earthquake or the like and a force in the horizontal direction and the vertical direction is generated in the ground, the support pile body cannot support the load and the support pile body is easily damaged. However, as above-mentioned, when a pile foundation structure is employ | adopted, it is common that there is no support yield strength which supports this load on the surface layer ground with respect to the load of the building constructed. Therefore, the pile foundation and the direct foundation were used together, and the load bearing capacity of the building on the foundation and the surface ground in contact with the foundation could not be used together with the bearing capacity of the supporting pile body.

Moreover, there is another problem described below due to the concentrated load on the support pile.
Generally, the building load is biased with respect to the horizontal plane. For this reason, the load which each support pile body supports is not uniform, and a balance may be bad. If this is left unattended, the building will be stable if the load on the pile support increases due to the above load imbalance and the support pile breaks due to various subsequent factors such as changes in the ground environment and surrounding environment, or the occurrence of external forces such as earthquake vibration. It is very dangerous because it will not be supported by.

  Furthermore, the surface layer ground that is so soft that the bearing strength is not exhibited against the load of the building tends to cause deformation of the ground shape due to external force, and thus has the following another problem. That is, there is a problem that cavities and voids are likely to be formed in the ground around the pile foundation due to the occurrence of vibration due to an earthquake or the like or the liquefaction phenomenon of the ground. The formation of the cavities and voids impairs the stability of the support pile, and as a result, the stability of the building is impaired, which is very dangerous.

The Architectural Institute of Japan, “Basic Design Guidelines for Architectural Foundations”, 1st Edition, 8th Edition, The Architectural Institute of Japan, July 25, 1996, p. 197-214

  This invention is made | formed in view of the problem of the said conventional pile foundation. That is, the present invention reduces the support load of the support pile body by using both the pile foundation and the direct foundation, and the balance of the load load of each support pile body is adjusted well, and further the periphery of the foundation structure of the present invention. An object of the present invention is to provide a foundation structure capable of stably supporting a building by preventing the formation of cavities and voids in the ground.

  Another object of the present invention is to provide a construction method for constructing the foundation structure of the present invention, and more specifically, it is possible to adjust the load deviation of the building applied to each supporting pile body as the building is constructed. Provide a foundation construction method that allows the pile foundation and the direct foundation to be used together by appropriately compressing the surface ground around the foundation, thereby reducing the load support burden of the supporting pile body. It is intended.

The present invention
(1) It has a pile foundation part and a direct foundation part provided with a support pile body and a pile head, a distortion material is installed between the support pile body and the direct foundation part, and has the distortion material. A foundation structure for buildings, characterized by comprising a joint part
(2) The building foundation structure according to claim 1, wherein the strain material is installed in contact with the pile head and the foundation portion directly.
(3) The foundation structure for buildings according to (1) above, wherein the upper end portion of the support pile body and the strained material are embedded in the pile head,
(4) The foamed resin board is directly embedded in contact with the base portion, and the compression creep ratio between the strained material and the foamed resin board is strained material: foamed resin board = 2: 1 to 200: 1. The basic structure for buildings according to any one of (1) to (3) above,
(5) The compressive creep of the strained material is 5% or more, and the foundation structure for building according to any one of (1) to (4) above, and (6) a supporting pile body In the process of constructing a pile foundation by forming a pile head on the upper part of the support pile body and constructing a foundation part directly on the upper part of the pile foundation, the support pile body and the direct foundation part A step of installing a strained material in between, then constructing a part of the building directly above the foundation portion to distort the strained material, and joining the strained material in the course of construction of the building A construction method of a foundation structure for buildings, characterized in that the pile foundation part and the direct foundation part are integrated through the joint part,
Is a summary.

In the present invention, a strained material is provided between the support pile and the direct foundation, and as the building is constructed above the foundation structure, the strained material is distorted by the load of the building. The effect of compressing the surrounding surface ground is also exhibited. The compressed surface layer ground has a high ground density, and load bearing strength is generated in the surface layer ground. As a result, a load bearing force is generated in the direct foundation portion in contact with the surface ground, and as a result, the pile foundation portion and the direct foundation portion can be used in combination.
Then, when a desired amount of strain is generated in the strained material, the foundation portion of the present invention is completed by integrating the pile foundation portion and the direct foundation portion by forming a rigid joint including the strained material. Is done.
Therefore, even on the surface layer ground that does not have the load bearing strength to support the building, it is possible to stably support the building without applying excessive load to the support pile by constructing the foundation structure of the present invention. it can.

That is, in the foundation structure of the present invention, the load of the building constructed above is supported not only by the support pile body and the support layer, but also by directly supporting the load support force of the foundation part and the surface layer ground below it. can do. As a result, compared with the conventional pile foundation, the load support burden of the support pile body is remarkably reduced, and the building can be supported more stably.
Even if earthquake vibrations or traffic vibrations occur and horizontal and vertical forces are applied to the support pile body, the foundation structure of the present invention has a direct foundation part and a pile foundation part. As a result, the load received by the support pile is reduced. Therefore, according to the present invention, even if vibration occurs due to an earthquake or the like, the support pile body is prevented from being damaged, and the building can be favorably supported.

  As described above, since the strained material is used in the present invention, the bias of the load of the building with respect to the support pile body can be adjusted by the strained material. That is, the strain amount of one strained material and the surface layer ground located below the heavy load structural portion of the building is large, and the other strain material and the surface layer ground located below the relatively lightly loaded structural portion. The amount of distortion is reduced. On the other hand, the compressive strength of each strained material is appropriately determined in advance, and the balance of the load deviation of the building can be adjusted by adjusting the difference in the amount of strain, and as a result, located below the strained material. It is possible to eliminate the load caused by the load weight of the building against the support pile.

  Furthermore, as described above, as the strain material is distorted, the surrounding surface ground is compressed, resulting in a higher ground density than before construction, resulting in vibration due to earthquakes, etc., or liquefaction of the ground. In addition, it is possible to prevent or reduce the generation of voids in the surface ground around the foundation.

  In particular, in the present invention in which the foamed resin board is disposed in direct contact with the base portion, the foamed resin board absorbs vibrations such as earthquake vibration, traffic vibration, and mechanical vibration. As a result, the influence of vibration received by the foundation structure is reduced, and the magnitude of vibration transmitted directly to the building via the foundation is reduced, thereby preventing or reducing the shaking of the building.

  And if it is the construction method of this invention, when constructing a building by installing a distortion material between a support pile body and a direct foundation part, a distortion material will be gradually distorted by the load of this building. It is possible to compress the surface ground located below the foundation as the strain material is distorted. Therefore, even when there is a bias in the load of the building, the bias is adjusted by the strain amount of each strained material, so the load on the support pile body can be reduced. Moreover, even if it does not perform special operations, such as consolidation, a surface layer ground can be compressed easily and moderately and support strength can be provided to this surface layer ground. As a result, it is possible to construct the foundation structure of the present invention including a pile foundation portion and a direct foundation portion even on the surface ground where the bearing strength of the building load is not sufficient, and further including a strained material and a rigid joint portion By forming the pile foundation portion and the direct foundation portion can be easily integrated.

  The best mode for carrying out the present invention will be described below with reference to the drawings illustrating the present invention.

FIG. 1 is an explanatory view showing an embodiment of the present invention. In order to construct the foundation structure of the present invention, first, as shown in FIG. 1 (1A), a pile foundation portion including a supporting pile body 3 and a pile head 2 is constructed, and a strain of thickness P is formed on the upper surface of the pile head 2 The material 1a is installed, and then a solid foundation 4a which is a direct foundation is constructed. Next, a building 7 is constructed above them. During the construction of the building 7, the strained material 1a is gradually distorted to become a strained material 1b having a thickness Q as shown in FIG. 1 (1B). When the strained material 1b is compressed in the longitudinal direction, the compression creep limit is exceeded and the rigidity is exhibited. As a result, a joint made of the strained material 1b is formed, and the pile foundation portion composed of the pile head 2 and the support pile body 3 is formed. And the solid foundation 4a are joined and integrated through the joining portion to complete the foundation structure of the present invention.
In this specification, GL means the ground level.

  FIG. 2 is a schematic longitudinal sectional view showing an embodiment of the basic structure of the present invention. The foundation structure shown in FIG. 2 can be constructed in the same manner as the foundation structure shown in FIG. 1 except that the foamed resin board 8 is directly laid in contact with the solid foundation 4a that is the foundation portion.

  FIG. 3 is a schematic longitudinal sectional view showing another embodiment of the basic structure of the present invention. The foundation structure shown in FIG. 3 is the foundation shown in FIG. 1 except that the cloth foundation 4b is directly formed as a foundation portion and the foamed resin board 8 is laid in contact with the cloth foundation 4b, the strained material 1 and the pile head 2. It can be constructed similarly to the structure. In FIG. 3, a concrete plate 17 is provided to prevent the foamed resin board 8 from being exposed to the ground surface, and a concrete slab 16 is provided between the cloth foundations 4b. In addition, instead of the concrete slab 16, a gap between the cloth foundations 4b may be provided.

  FIG. 4 is a schematic longitudinal sectional view showing still another embodiment of the basic structure of the present invention. The foundation structure shown in FIG. 4 is the same as that shown in FIG. 1 except that the strained material 1 is embedded in the pile head 2 together with the upper end of the support pile body 3 in the course of constructing the pile foundation. Can be constructed as well. That is, by forming a joint portion on the upper surface of the support pile body 3, the support pile body 3 and the pile head 2 are joined, whereby the pile foundation portion and the direct foundation portion 4 as a whole are integrated. The basic structure is completed.

  FIG. 5 is a schematic longitudinal sectional view showing still another embodiment of the basic structure of the present invention. In the foundation structure shown in FIG. 5, the strained material 1 is embedded and installed in the pile head 2 together with the upper end of the support pile body 3 in the course of constructing the pile foundation portion, and the pile head 2 is embedded in the solid foundation 4 a. It can be constructed in the same manner as the basic structure shown in FIG.

Below, the construction method of the basic structure of this invention is demonstrated mainly using FIG.
First, the support pile body 3 is placed in a predetermined position so that the tip thereof is embedded in the support layer 6, and then a part of the surface layer ground 5 is discharged, and the pile including the exposed upper portion of the support pile body 3 is included. Head 2 is formed. The above-mentioned placement of the support pile body 3 and formation of the pile head 2 can be performed by a method similar to a conventionally known method for constructing a pile foundation.

Next, the strain material 1 a is installed on the upper surface of the pile head 2. The strained material 1a may be simply placed on the upper surface of the pile head 2, or the upper surface of the pile head 2 and the lower surface of the strained material 1a may be bonded using an adhesive or an adhesive material. Then, after the strained material 1a is installed, the periphery of the side surface of the strained material 1a is backfilled to the height of the upper surface of the strained material 1a, or the foamed resin board 8 is raised to the height of the upper surface of the strained material 1a as shown in FIG. Arrange the construction surface by laying.
In order to form a joint between the pile head 2 and the solid foundation 4a (or the fabric foundation 4b) which is a direct foundation in a later process, in the process of installing the strained material 1 as shown in FIG. A concrete filling space 10 can be provided around the side surfaces of the material 1 and the pile head 2. Further, as shown in FIG. 7, in addition to the concrete filling space 10, reinforcing bars 14 may be provided on the pile head 2 and the solid foundation 4.
As another aspect, as shown in FIG. 8, the strained material 1, which is a rubber product having a filling portion 15 for filling a gas or liquid, a valve 11, a pressure gauge 12 and a valve 13, is installed on the upper surface of the pile head 2. In addition, a concrete filling space 10 may be provided around the side surfaces of the strained material 1 and the pile head 2.

  It is important that the strained material in the present invention is provided between the support pile body and the direct foundation part, and is distorted by the load of the building 7 constructed above the direct foundation part. Therefore, the installation position and installation method of the strained material are not limited to the above description. For example, as shown in FIG. 4, the strain material 1 may be embedded in the pile head 2 together with the upper end portion of the support pile body 3. Further, as shown in FIG. 5, the pile head 2 in which the strained material 1 and the upper end portion of the support pile body 3 are embedded may be directly embedded in the solid foundation 4a which is the foundation portion. The foundation 4a may be formed in a separate process, or may be simultaneously formed and integrated using concrete.

In the embodiment in which the strained material 1 is embedded in the pile head 2 together with the upper end portion of the support pile body 3, the strained material 1 is installed in the horizontal direction on the upper surface of the upper end portion of the support pile body 3 as shown in FIG. It can also be provided in the vertical direction in contact with the side surface. By installing the strain material 1 in the vertical direction, when the vibration is generated by an earthquake or the like and the horizontal force is applied to the foundation structure, the strain material 1 is placed between the pile head 2 and the support pile body 3 and so on. It is preferable because it becomes a cushioning material and can absorb and reduce vibration.
Moreover, as shown in FIG. 10, the strained material 1 installed in the horizontal direction can also be installed after providing the pile protection metal cap 18 in contact with the upper end surface of the support pile body 3, and providing the rubber plate 19 on the upper surface. The rubber plate 19 may be a sheet having smooth upper and lower surfaces, or may be a sheet in which both or one of the upper and lower surfaces has an uneven shape.
In addition, as shown in FIG. 11, a concrete filling space 10 may be provided between the upper end portion of the support pile body 3 and the strained material 1 and the pile head 2. At this time, it is also possible to provide reinforcing bars in advance on the strained material 1 and the pile head 2 in accordance with FIG. 7 (not shown).
Further, as shown in FIG. 12, the strained material 1 embedded in the pile head 2 is a rubber product having a valve 11, a pressure gauge 12, a valve 13, and a filling portion 15, and the strained material 1 and the supporting pile body 3. It is also possible to provide a concrete filling space 10 between the upper end portion of the steel and the pile head 2.

In particular, in the present invention, in order to further provide the foamed resin board 8 in direct contact with the base portion 4, for example, the foamed resin board 8 can be laid at a predetermined position as shown in FIG. The foamed resin board 8 can be formed into a foamed resin board 8 by combining a plurality of foamed resin blocks having arbitrary dimensions and shapes. In order to form the foamed resin board 8 by the plurality of foamed resin blocks, the foamed resin board 8 is formed by simply combining or stacking the blocks in the hole formed for embedding the foamed resin board 8. Alternatively, the foamed resin board 8 is formed by bonding the foamed resin blocks with an arbitrary adhesive or adhesive tape, or joining the foamed resin blocks with a fastener such as a bolt or a fastening metal fitting. May be.
The arrangement of the foamed resin board 8 is not limited to the arrangement position disclosed in FIG. 2 or FIG. For example, the foamed resin board 8 may be laid so that a part or all of the solid foundation 4a (or the cloth foundation 4b) and the surface ground 5 are isolated, and the strain material 1 and the pile head 2 and the surface ground 5 May be laid so as to be isolated from a part or the whole. Furthermore, when the foundation structure of the present invention is adopted as the foundation of a building having a basement, it is preferable that the foamed resin board is also laid between the side surface of the basement and the ground.

In the present invention, the solid foundation 4a can be constructed by using a solid foundation construction method known as a direct foundation. However, in the construction method of the present invention, after the solid foundation 4a is constructed, the strained material 1a is distorted as the building 7 is constructed, and the position of the solid foundation 4a located above the strained material 1a is also lowered by the amount of the strain. Therefore, it is necessary to provide the solid foundation 4a at a position higher than the height at which the solid foundation should be finally positioned by the amount of distortion (PQ) expected in the strained material 1a.
In addition, as shown in FIG. 3, you may construct | assemble the cloth foundation 4b as a direct foundation part instead of the solid foundation 4a. Even when the fabric foundation 4b is constructed, the point that the conventional fabric foundation construction method can be adopted and the height of the fabric foundation needs to be adjusted in advance are the same as described above.

  At the time of constructing the support pile body 3, the pile head 2, the strained material 1a, and the solid foundation 4a, the strained material 1a is not distorted to the extent that a joint is formed. Then, the building 7 is constructed above the solid foundation 4a. As the building 7 is constructed, the distortion material 1a is subjected to the load of the building 7 and is distorted. At the same time, the surface ground 5 located below the solid foundation 4a where the strained material 1a is not disposed is also compressed.

  In particular, when the building 7 is constructed by providing the foamed resin board 8 in the present invention, when the foamed resin board 8 is compressed as the strained material 1a is distorted, both the foamed resin board 8 and the surface layer ground 5 located below the foamed resin board 8 are provided. In some cases, only the surface ground 5 is compressed. Whether one or both of the foamed resin board 8 and the surface layer ground 5 due to the load applied from above is compressed depends on the relationship between the compressive strength of the foamed resin board 8 and the support strength of the surface layer ground 5. However, in any case, the soft layer around the foundation structure is compressed, and load bearing strength is generated there.

Next, during the construction of the building 7, the strain amount of the strained material 1 b is measured. The strain amount of the strained material used in the present specification means a difference in height between the strained material before and after the load from above is applied.
As a measuring method of the strain amount of the strained material, the thickness Q of the strained material 1b is directly measured, and the strain amount (PQ) can be calculated from the dimension P when the strained material 1a is installed and the above Q. . As another measurement method, as shown in FIG. 6, a pressure gauge 12 is provided in advance on the strain material 1, and the strain amount can be converted from the pressure indicated by the pressure gauge 12. As a further measurement method, the amount of settlement of the building 7 or the solid foundation 4a can be measured based on the ground level and converted into a distortion amount.

  As described above, the strain amount (PQ) of the strained material 1b is measured, and after confirming that the strain amount is distorted by a desired amount, preferably 1 cm or more and 20 cm or less, a joint portion is formed. At this time, the strain amount may be different depending on each strain material, or may be the same. However, if the difference in the amount of strain of each strained material is too large, the horizontality of the building may be hindered. Therefore, if the load on the building 7 is largely biased with respect to the horizontal plane, etc. It is desirable to appropriately determine the compressive strength in accordance with each supporting load and adjust the strain amount of each strained material. Thus, by adjusting the bias of the load of the building with the strained material, the load due to the unbalanced load of the building can be reduced with respect to the support pile positioned below the strained material. Further, the strain amount of the strained material may be adjusted to a desired amount by installing a hydraulic jack at the time of installing the strained material and operating the hydraulic jack.

The joint part in this invention can use the distortion material which was compressed by the load of the building and produced rigidity as a joint part. For example, it is known that a foamed resin body is distorted in the compression direction when compressed, and becomes very hard when the compression creep limit is exceeded. Utilizing this property, if a foamed resin body is used for the strain material, it is possible to distort the strain material made of the foam resin body to a hardness equivalent to concrete by applying a load of the building from above. This hard and distorted strain material can be used as a joint.
As another method for forming a joint, there is a method in which the strained material 1 is distorted by the load of the building, and then the concrete filling space 10 is filled with concrete, and the strained material is solidified from the surroundings to form a joint (see FIG. 6 and FIG. 11). Furthermore, if reinforcing bars 14 are provided on the pile head 2 and the direct foundation 4 in advance, when the concrete filling space 10 is filled with concrete, the reinforcing bars 14 constitute a framework in the concrete and form a more robust joint. (See FIG. 7).
As another method for forming a joint part, when using the strained material 1 which is a rubber product having a filling part 15 that can be filled with gas or liquid, a valve 11, a pressure gauge 12 and a valve 13, the valve 11, There is a method in which the amount of strain is adjusted by adjusting the filling amount of the filling portion 15 with the valve 13 and the pressure gauge 12, and then the concrete is filled into the concrete filling space 10 to solidify the strained material from the surroundings to form a joint portion. (See FIGS. 8 and 12).

  If it is the construction method of the foundation structure of this invention mentioned above, it will be distorted by the load of this building only by installing a distortion material in the arbitrary positions between a support pile body and a foundation part, and building a building. The material can be gradually distorted, and the surrounding surface ground (or foamed resin disk) can be compressed by the amount of distortion of the distorted material. Then, after obtaining an appropriate amount of strain, a joint having rigidity including a strained material can be formed, and the pile foundation and the direct foundation can be easily integrated. This completes the foundation structure of the present invention that can favorably support the load of the building between the pile foundation and the direct foundation without requiring a particularly complicated construction work.

  After completing the basic structure of the present invention, the rest of the building 7 can be constructed. At this time, since the strained material 1b constituting the joint exceeds the compression creep limit, the strained material 1 is not further distorted. Moreover, the joint part including the strained material shown in FIGS. 6 to 8, FIG. 11 and FIG. 12 is hardened with concrete, and further, the strained material is not distorted.

  The foundation structure constructed by the construction method of the present invention described above can also be adopted for the foundation of a building having a basement part. In this case, the foundation structure is constructed under the basement space. That's fine. In particular, as shown in FIG. 2 or 3, when the foamed resin board 8 is provided in direct contact with the base portion 4 in the present invention, the foamed resin board 8 can be further arranged in contact with the basement outer surface. . According to this, since not only the foundation structure but also the part of the building buried in the ground is isolated from the ground by the foamed resin board 8, earthquake vibration, traffic vibration, mechanical vibration, etc. are transmitted to the building 7. This is preferable because it becomes difficult and the shaking of the building 7 can be reduced.

  In addition, the foundation structure for a building of the present invention can be constructed as a foundation structure of a new building by the above construction method, and can also be applied to an existing building where a pile foundation is adopted. . When using the foundation structure of the present invention for an existing building, the structural portion such as the floor and slab at a predetermined position of the building is removed to expose the upper end of the pile, the pile head in the present invention, the distortion material, And cut the top of the pile directly to secure the installation space such as foundation. Then, the pile head, the distorted material, and the direct foundation are sequentially formed. At the same time, a hydraulic jack is installed at the installation position of the distorted material, and the distorted material is gradually distorted by operating the jack, and then the jack is removed. Next, a strained material distorted to a desired amount is used as a joint, as in the above-described joint formation method, or a joint is formed by filling concrete around the strained material, and an existing support pile body and The basic structure of the present invention can be completed by integrating the newly provided direct foundation.

Next, the basic structure of the present invention will be described in detail for each configuration.
The support pile body in the present invention may be of any type as long as it stands vertically from the support layer and can transmit the load of the building to the support layer. Specifically, there are driven piles that are driven into the ground using existing pile bodies, embedded piles that are provided with holes in the ground and embedded in existing pile bodies, or cast-in-place concrete piles such as all-casing piles or earth drill method piles, etc. However, it is not limited to the above.

  And the pile head is provided in the upper part of the said support pile body. If the pile head in this invention can receive the load of a building from upper direction and can transmit this to a support pile body, it will not receive a restriction | limiting in particular in the magnitude | size and a raw material. That is, the support pile body and the pile head can be appropriately selected and used as long as they constitute a conventionally known pile foundation.

  The strained material used in the present invention needs to be formed of a material or a shape that exhibits a certain amount of strain due to a load transmitted from above. Specifically, it can be formed using a foamed resin body or a rubber material. The shape of the strained material formed by the foamed resin board or rubber material is not particularly limited, but since the strained material is installed between the pile head and the direct foundation, the installation stability between the two is good. From this point, for example, a rectangular parallelepiped shape or a cylindrical shape is preferable.

  Examples of the foamed resin used for the strain material include polystyrene resin foam, polyethylene resin foam, polypropylene resin foam, polyurethane resin foam, polyvinyl chloride resin foam, and thermoplastic polyester resin. Examples include foams, polycarbonate resin foams, polyamide resin foams, polyphenylene ether resin foams, or mixtures of two or more of the above-described resins. In particular, a polystyrene resin foam, a polyethylene resin foam, a polypropylene resin foam, and a combination thereof are preferable from the viewpoint of weight and strength. Polyurethane resin foams may deteriorate in durability when hydrolysis occurs in the ground. Polyvinyl chloride resin foams generate hydrochloric acid gas when burned, causing pollution problems. Therefore, when using these resin foams, it is necessary to pay attention not to cause the above problem.

  The strained material formed from the foamed resin body has a desired shape by so-called in-mold foaming in which a bead-like foam particle is filled in a container formed in a desired shape and heated to fuse the foam particles together. It can be formed as a foamed resin block. Alternatively, a desired shape can be obtained by filling spherical foamed particles in a suitably shaped container and heating them to fuse the foamed particles together to form a suitably shaped foamed resin block and then processing it into the desired shape. It can be formed as a foamed resin block of the shape.

  On the other hand, as the rubber material used for the strain material, general-purpose synthetic rubber, natural rubber, or a combination thereof can be used. In the case of using natural rubber, it is preferable to employ a configuration in which the weather resistance is improved by covering the natural rubber with a rubber sheet having excellent weather resistance or another sheet. The strained material formed using rubber may be formed from a straight rubber body or a block-shaped rubber body such as a cylinder. Moreover, the metal plate formed with iron etc. may be laminated | stacked on the upper surface and lower surface of the said rubber body (not shown). Furthermore, as another aspect, the distortion material which consists of a rubber product provided with the filling part which can be filled with gas or a liquid, a valve | bulb, and a pressure gauge may be sufficient (refer FIG. 8 or FIG. 12).

  The compressive creep of the foamed resin body or rubber material constituting the strain material is preferably 5% or more, more preferably 10% or more, and further preferably 15% or more. It is preferable that the compression creep is 5% or more because the compression creep can be gradually distorted by being compressed by the load of the building constructed above the foundation on which the strain material is installed. Further, when the strained material is a rubber product having a filling space inside, the rubber constituting the rubber product has the above-described compression creep so that the desired strain can be adjusted while adjusting the filling and discharging of the gas or liquid to be filled. The quantity can be obtained. On the other hand, the upper limit of the compression creep is not particularly limited, but from the viewpoint of preventing the strained material from reaching the creep limit due to the weight of the foundation directly before building the building, the compression creep is 90%. % Or less, more preferably 80% or less, and even more preferably 70% or less.

The compression creep of the strained material can be measured according to JIS K 6767. Specifically, a test piece having a vertical dimension of about 50 mm, a horizontal dimension of about 50 mm, and a thickness of about 25 mm is prepared using a foamed resin body or a rubber material constituting the strain material, and the temperature is 20 ± 2 ° C. and the relative humidity is 65 ±. The thickness of the test piece when a load of ² g / cm ² was applied to the test piece in a standard state of 5% was set to T _0, and the thickness after 24 hours was set to Td after being left in the state where the load was applied. Sometimes (T ₀ −T _d ) ÷ T ₀ × 100. In addition, the distortion material which is a rubber product which has a valve, a pressure gauge, and a filling part can adjust compression creep and distortion amount arbitrarily with a pressure gauge and a valve irrespective of the said measuring method.

  The dimension of the strained material may be determined so as to obtain a desired strain amount, preferably a strain amount of 1 cm or more and 20 cm or less, during the construction of the building in consideration of the compression creep of the strain material and the building load. it can. Further, when a rubber product including a filling portion, a valve and a pressure gauge for filling a gas or liquid therein is used as the strain material, the strain amount can be adjusted by adjusting the amount of the gas or liquid to be filled. Therefore, the dimension of the strained material can be determined in consideration of this.

The compressive strength of the foamed resin body or rubber material used for the strained material of the present invention is not particularly limited and can be determined in consideration of the supporting force of the pile foundation and the load of the building. Compressive strength of the foamed resin is preferably at most 30 N / cm ² or more 100 N / cm ^2, the compressive strength of the rubber material preferably 3N / cm ² or more 49N / cm ² or less.
In addition, the compressive strength of the said foamed resin and rubber material can be measured according to the measuring method of the short-term compressive strength shown by JISK7220. Specifically, a test piece having a vertical dimension of about 50 mm, a horizontal dimension of about 50 mm, and a thickness of about 50 mm is prepared, the test piece is compressed at a loading speed of 10 mm / min, and the compressive stress at 5% compression strain is measured. Thus, the compression strength in the present invention can be obtained.

  In the present invention, the foamed resin board used in direct contact with the foundation can be formed by combining a plurality of foamed resin blocks having arbitrary shapes and dimensions as described above. The foamed resin block can be molded by the same molding method using the same resin as the foamed resin body block that can be used for the strain material.

  The foamed resin board exhibits the effect of dampening vibrations such as earthquake vibrations, traffic vibrations or mechanical vibrations transmitted from the ground, and prevents or reduces the transmission of these vibrations to the foundation structure and also to the building. Can do. Therefore, it is preferable to use the above-mentioned foamed resin board in the present invention because it can prevent damage to the foundation structure due to vibrations and can reduce the body seismic intensity in the building.

  In laying the foamed resin board in the present invention, it is necessary that the compression creep value of the strained material is larger than the compression creep value of the foamed resin board. The preferable compression creep ratio of the two differs depending on the area ratio in which the strained material and the foamed resin board are in direct contact with the foundation, but the strained material: foamed resin board is required to be in the range of 2: 1 to 200: 1. . By securing the compression creep ratio within the above range, the strained material can be preferentially distorted when a load is applied to the strained material and the foamed resin board. On the other hand, whether or not the foamed resin board is compressed and distorted together with the strained material at this time depends on the relationship between the compression creep value of the foamed resin board and the load bearing strength of the surface layer ground located below the foamed resin board. That is, in the foamed resin board and the surface ground, the layer with weaker load resistance is compressed, which increases the density of the compressed layer, improves the load resistance compared to before compression, The load can be supported.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing explaining the embodiment of this invention, (1A) is the longitudinal cross-sectional schematic of the foundation structure before building construction, (1B) is a building constructed above the foundation structure shown by (1A). It is the longitudinal cross-sectional schematic of the basic structure of this invention by which distortion generate | occur | produced in the distortion material and the junction part was formed with this distortion material. It is a longitudinal section schematic diagram showing one embodiment of the basic structure of the present invention. It is a longitudinal section schematic diagram showing one embodiment of the basic structure of the present invention. It is a longitudinal section schematic diagram showing one embodiment of the basic structure of the present invention. It is a longitudinal section schematic diagram showing one embodiment of the basic structure of the present invention. It is a partial longitudinal section schematic diagram of the present invention. It is a partial longitudinal section schematic diagram of the present invention. It is a partial longitudinal section schematic diagram of the present invention. It is a partial longitudinal section schematic diagram of the present invention. It is a partial longitudinal section schematic diagram of the present invention. It is a partial longitudinal section schematic diagram of the present invention. It is a partial longitudinal section schematic diagram of the present invention.

Explanation of symbols

1 Distorted material
DESCRIPTION OF SYMBOLS 1a Strained material before building construction 1b Strained material constituting the joint 2 Pile head 3 Support pile body 4 Direct foundation 4a Solid foundation 4b Fabric foundation 5 Surface ground 6 Support layer 7 Building 8 Foamed resin board 10 Concrete filling space DESCRIPTION OF SYMBOLS 11 Valve 12 Pressure gauge 13 Valve 14 Reinforcement 15 Filling part 16 Concrete slab 17 Concrete plate 18 Pile protection metal cap 19 Rubber plate P Thickness of distortion material 1a Q Thickness of distortion material 1b

Claims (6)

  It has a pile foundation part and a direct foundation part provided with a support pile body and a pile head, a distortion material is installed between the support pile body and the direct foundation part, and a joint comprising the distortion material A basic structure for a building characterized by comprising a section.   The building foundation structure according to claim 1, wherein the strained material is installed in contact with the pile head and the foundation portion directly.   The foundation structure for buildings according to claim 1, wherein an upper end portion of the support pile body and a strained material are embedded in the pile head.   A foamed resin board is directly embedded in contact with the base portion, and a compression creep ratio between the strained material and the foamed resin board is strained material: foamed resin board = 2: 1 to 200: 1. The building foundation structure according to any one of claims 1 to 3.   The building foundation structure according to any one of claims 1 to 4, wherein a compressive creep of the strained material is 5% or more. In the step of placing a support pile body, forming a pile head by forming a pile head at the top of the support pile body, and constructing a foundation directly at the top of the pile foundation, the support pile body and the direct And a step of installing a strained material between the foundation portion, and then building a part of the building directly above the foundation portion to distort the strained material. A construction method for a foundation structure for a building, comprising: forming a joint portion including: and integrating the pile foundation portion and the direct foundation portion via the joint portion.

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